--- /dev/null
+#
+# Makefile for the dump device drivers.
+#
+
+dump-y := dump_setup.o dump_fmt.o dump_filters.o dump_scheme.o dump_execute.o
+dump-$(CONFIG_X86) += dump_i386.o
+dump-$(CONFIG_ARM) += dump_arm.o
+dump-$(CONFIG_PPC64) += dump_ppc64.o
+dump-$(CONFIG_CRASH_DUMP_MEMDEV) += dump_memdev.o dump_overlay.o
+dump-objs += $(dump-y)
+
+obj-$(CONFIG_CRASH_DUMP) += dump.o
+obj-$(CONFIG_CRASH_DUMP_BLOCKDEV) += dump_blockdev.o
+obj-$(CONFIG_CRASH_DUMP_NETDEV) += dump_netdev.o
+obj-$(CONFIG_CRASH_DUMP_COMPRESS_RLE) += dump_rle.o
+obj-$(CONFIG_CRASH_DUMP_COMPRESS_GZIP) += dump_gzip.o
--- /dev/null
+/*
+ * Architecture specific (ARM/XScale) functions for Linux crash dumps.
+ *
+ * Created by: Fleming Feng (fleming.feng@intel.com)
+ *
+ * Copyright(C) 2003 Intel Corp. All rights reserved.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/*
+ * The hooks for dumping the kernel virtual memory to disk are in this
+ * file. Any time a modification is made to the virtual memory mechanism,
+ * these routines must be changed to use the new mechanisms.
+ */
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+#include <linux/vmalloc.h>
+#include <linux/dump.h>
+#include <linux/mm.h>
+#include <asm/processor.h>
+#include <asm/hardirq.h>
+#include <asm/kdebug.h>
+
+static __s32 saved_irq_count; /* saved preempt_count() flags */
+
+static int alloc_dha_stack(void)
+{
+ int i;
+ void *ptr;
+
+ if (dump_header_asm.dha_stack[0])
+ return 0;
+
+ ptr = vmalloc(THREAD_SIZE * num_online_cpus());
+ if (!ptr) {
+ printk("vmalloc for dha_stacks failed\n");
+ return -ENOMEM;
+ }
+
+ for( i = 0; i < num_online_cpus(); i++){
+ dump_header_asm.dha_stack[i] = (u32)((unsigned long)ptr +
+ (i * THREAD_SIZE));
+ }
+
+ return 0;
+}
+
+static int free_dha_stack(void)
+{
+ if (dump_header_asm.dha_stack[0]){
+ vfree((void*)dump_header_asm.dha_stack[0]);
+ dump_header_asm.dha_stack[0] = 0;
+ }
+ return 0;
+}
+
+void __dump_save_regs(struct pt_regs* dest_regs, const struct pt_regs* regs)
+{
+
+ /* Here, because the arm version uses _dump_regs_t,
+ * instead of pt_regs in dump_header_asm, while the
+ * the function is defined inside architecture independent
+ * header file include/linux/dump.h, the size of block of
+ * memory copied is not equal to pt_regs.
+ */
+
+ memcpy(dest_regs, regs, sizeof(_dump_regs_t));
+
+}
+
+#ifdef CONFIG_SMP
+/* FIXME: This is reserved for possible future usage for SMP system
+ * based on ARM/XScale. Currently, there is no information for an
+ * SMP system based on ARM/XScale, they are not used!
+ */
+/* save registers on other processor */
+void
+__dump_save_other_cpus(void)
+{
+
+ /* Dummy now! */
+
+ return;
+
+}
+#else /* !CONFIG_SMP */
+#define save_other_cpu_state() do { } while (0)
+#endif /* !CONFIG_SMP */
+
+/*
+ * Kludge - dump from interrupt context is unreliable (Fixme)
+ *
+ * We do this so that softirqs initiated for dump i/o
+ * get processed and we don't hang while waiting for i/o
+ * to complete or in any irq synchronization attempt.
+ *
+ * This is not quite legal of course, as it has the side
+ * effect of making all interrupts & softirqs triggered
+ * while dump is in progress complete before currently
+ * pending softirqs and the currently executing interrupt
+ * code.
+ */
+static inline void
+irq_bh_save(void)
+{
+ saved_irq_count = irq_count();
+ preempt_count() &= ~(HARDIRQ_MASK|SOFTIRQ_MASK);
+}
+
+static inline void
+irq_bh_restore(void)
+{
+ preempt_count() |= saved_irq_count;
+}
+
+/*
+ * Name: __dump_irq_enable
+ * Func: Reset system so interrupts are enabled.
+ * This is used for dump methods that requires interrupts
+ * Eventually, all methods will have interrupts disabled
+ * and this code can be removed.
+ *
+ * Re-enable interrupts
+ */
+int
+__dump_irq_enable(void)
+{
+ irq_bh_save();
+ local_irq_enable();
+ return 0;
+}
+
+/* Name: __dump_irq_restore
+ * Func: Resume the system state in an architecture-specific way.
+ */
+void
+__dump_irq_restore(void)
+{
+ local_irq_disable();
+ irq_bh_restore();
+}
+
+
+/*
+ * Name: __dump_configure_header()
+ * Func: Meant to fill in arch specific header fields except per-cpu state
+ * already captured in dump_lcrash_configure_header.
+ */
+int
+__dump_configure_header(const struct pt_regs *regs)
+{
+ return (0);
+}
+
+/*
+ * Name: dump_die_event
+ * Func: Called from notify_die
+ */
+static int dump_die_event(struct notifier_block* this,
+ unsigned long event,
+ void* arg)
+{
+ const struct die_args* args = (const struct die_args*)arg;
+
+ switch(event){
+ case DIE_PANIC:
+ case DIE_OOPS:
+ case DIE_WATCHDOG:
+ dump_execute(args->str, args->regs);
+ break;
+ }
+ return NOTIFY_DONE;
+
+}
+
+static struct notifier_block dump_die_block = {
+ .notifier_call = dump_die_event,
+};
+
+/* Name: __dump_init()
+ * Func: Initialize the dumping routine process.
+ */
+void
+__dump_init(uint64_t local_memory_start)
+{
+ /* hook into PANIC and OOPS */
+ register_die_notifier(&dump_die_block);
+}
+
+/*
+ * Name: __dump_open()
+ * Func: Open the dump device (architecture specific). This is in
+ * case it's necessary in the future.
+ */
+void
+__dump_open(void)
+{
+
+ alloc_dha_stack();
+
+ return;
+}
+
+/*
+ * Name: __dump_cleanup()
+ * Func: Free any architecture specific data structures. This is called
+ * when the dump module is being removed.
+ */
+void
+__dump_cleanup(void)
+{
+ free_dha_stack();
+ unregister_die_notifier(&dump_die_block);
+
+ /* return */
+ return;
+}
+
+/*
+ * Name: __dump_page_valid()
+ * Func: Check if page is valid to dump.
+ */
+int
+__dump_page_valid(unsigned long index)
+{
+ if(!pfn_valid(index))
+ return 0;
+ else
+ return 1;
+}
+
+/*
+ * Name: manual_handle_crashdump
+ * Func: Interface for the lkcd dump command. Calls dump_execute()
+ */
+int
+manual_handle_crashdump(void) {
+
+ _dump_regs_t regs;
+
+ get_current_general_regs(®s);
+ get_current_cp14_regs(®s);
+ get_current_cp15_regs(®s);
+ dump_execute("manual", ®s);
+ return 0;
+}
--- /dev/null
+/*
+ * Implements the dump driver interface for saving a dump to
+ * a block device through the kernel's generic low level block i/o
+ * routines.
+ *
+ * Started: June 2002 - Mohamed Abbas <mohamed.abbas@intel.com>
+ * Moved original lkcd kiobuf dump i/o code from dump_base.c
+ * to use generic dump device interfaces
+ *
+ * Sept 2002 - Bharata B. Rao <bharata@in.ibm.com>
+ * Convert dump i/o to directly use bio instead of kiobuf for 2.5
+ *
+ * Oct 2002 - Suparna Bhattacharya <suparna@in.ibm.com>
+ * Rework to new dumpdev.h structures, implement open/close/
+ * silence, misc fixes (blocknr removal, bio_add_page usage)
+ *
+ * Copyright (C) 1999 - 2002 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/bio.h>
+#include <asm/hardirq.h>
+#include <linux/dump.h>
+#include "dump_methods.h"
+
+extern void *dump_page_buf;
+
+/* The end_io callback for dump i/o completion */
+static int
+dump_bio_end_io(struct bio *bio, unsigned int bytes_done, int error)
+{
+ struct dump_blockdev *dump_bdev;
+
+ if (bio->bi_size) {
+ /* some bytes still left to transfer */
+ return 1; /* not complete */
+ }
+
+ dump_bdev = (struct dump_blockdev *)bio->bi_private;
+ if (error) {
+ printk("IO error while writing the dump, aborting\n");
+ }
+
+ dump_bdev->err = error;
+
+ /* no wakeup needed, since caller polls for completion */
+ return 0;
+}
+
+/* Check if the dump bio is already mapped to the specified buffer */
+static int
+dump_block_map_valid(struct dump_blockdev *dev, struct page *page,
+ int len)
+{
+ struct bio *bio = dev->bio;
+ unsigned long bsize = 0;
+
+ if (!bio->bi_vcnt)
+ return 0; /* first time, not mapped */
+
+
+ if ((bio_page(bio) != page) || (len > bio->bi_vcnt << PAGE_SHIFT))
+ return 0; /* buffer not mapped */
+
+ bsize = bdev_hardsect_size(bio->bi_bdev);
+ if ((len & (PAGE_SIZE - 1)) || (len & bsize))
+ return 0; /* alignment checks needed */
+
+ /* quick check to decide if we need to redo bio_add_page */
+ if (bdev_get_queue(bio->bi_bdev)->merge_bvec_fn)
+ return 0; /* device may have other restrictions */
+
+ return 1; /* already mapped */
+}
+
+/*
+ * Set up the dump bio for i/o from the specified buffer
+ * Return value indicates whether the full buffer could be mapped or not
+ */
+static int
+dump_block_map(struct dump_blockdev *dev, void *buf, int len)
+{
+ struct page *page = virt_to_page(buf);
+ struct bio *bio = dev->bio;
+ unsigned long bsize = 0;
+
+ bio->bi_bdev = dev->bdev;
+ bio->bi_sector = (dev->start_offset + dev->ddev.curr_offset) >> 9;
+ bio->bi_idx = 0; /* reset index to the beginning */
+
+ if (dump_block_map_valid(dev, page, len)) {
+ /* already mapped and usable rightaway */
+ bio->bi_size = len; /* reset size to the whole bio */
+ } else {
+ /* need to map the bio */
+ bio->bi_size = 0;
+ bio->bi_vcnt = 0;
+ bsize = bdev_hardsect_size(bio->bi_bdev);
+
+ /* first a few sanity checks */
+ if (len < bsize) {
+ printk("map: len less than hardsect size \n");
+ return -EINVAL;
+ }
+
+ if ((unsigned long)buf & bsize) {
+ printk("map: not aligned \n");
+ return -EINVAL;
+ }
+
+ /* assume contig. page aligned low mem buffer( no vmalloc) */
+ if ((page_address(page) != buf) || (len & (PAGE_SIZE - 1))) {
+ printk("map: invalid buffer alignment!\n");
+ return -EINVAL;
+ }
+ /* finally we can go ahead and map it */
+ while (bio->bi_size < len)
+ if (bio_add_page(bio, page++, PAGE_SIZE, 0) == 0) {
+ break;
+ }
+
+ bio->bi_end_io = dump_bio_end_io;
+ bio->bi_private = dev;
+ }
+
+ if (bio->bi_size != len) {
+ printk("map: bio size = %d not enough for len = %d!\n",
+ bio->bi_size, len);
+ return -E2BIG;
+ }
+ return 0;
+}
+
+static void
+dump_free_bio(struct bio *bio)
+{
+ if (bio)
+ kfree(bio->bi_io_vec);
+ kfree(bio);
+}
+
+/*
+ * Prepares the dump device so we can take a dump later.
+ * The caller is expected to have filled up the dev_id field in the
+ * block dump dev structure.
+ *
+ * At dump time when dump_block_write() is invoked it will be too
+ * late to recover, so as far as possible make sure obvious errors
+ * get caught right here and reported back to the caller.
+ */
+static int
+dump_block_open(struct dump_dev *dev, unsigned long arg)
+{
+ struct dump_blockdev *dump_bdev = DUMP_BDEV(dev);
+ struct block_device *bdev;
+ int retval = 0;
+ struct bio_vec *bvec;
+
+ /* make sure this is a valid block device */
+ if (!arg) {
+ retval = -EINVAL;
+ goto err;
+ }
+
+ /* Convert it to the new dev_t format */
+ arg = MKDEV((arg >> OLDMINORBITS), (arg & OLDMINORMASK));
+
+ /* get a corresponding block_dev struct for this */
+ bdev = bdget((dev_t)arg);
+ if (!bdev) {
+ retval = -ENODEV;
+ goto err;
+ }
+
+ /* get the block device opened */
+ if ((retval = blkdev_get(bdev, O_RDWR | O_LARGEFILE, 0))) {
+ goto err1;
+ }
+
+ if ((dump_bdev->bio = kmalloc(sizeof(struct bio), GFP_KERNEL))
+ == NULL) {
+ printk("Cannot allocate bio\n");
+ retval = -ENOMEM;
+ goto err2;
+ }
+
+ bio_init(dump_bdev->bio);
+
+ if ((bvec = kmalloc(sizeof(struct bio_vec) *
+ (DUMP_BUFFER_SIZE >> PAGE_SHIFT), GFP_KERNEL)) == NULL) {
+ retval = -ENOMEM;
+ goto err3;
+ }
+
+ /* assign the new dump dev structure */
+ dump_bdev->dev_id = (dev_t)arg;
+ dump_bdev->bdev = bdev;
+
+ /* make a note of the limit */
+ dump_bdev->limit = bdev->bd_inode->i_size;
+
+ /* now make sure we can map the dump buffer */
+ dump_bdev->bio->bi_io_vec = bvec;
+ dump_bdev->bio->bi_max_vecs = DUMP_BUFFER_SIZE >> PAGE_SHIFT;
+
+ retval = dump_block_map(dump_bdev, dump_config.dumper->dump_buf,
+ DUMP_BUFFER_SIZE);
+
+ if (retval) {
+ printk("open: dump_block_map failed, ret %d\n", retval);
+ goto err3;
+ }
+
+ printk("Block device (%d,%d) successfully configured for dumping\n",
+ MAJOR(dump_bdev->dev_id),
+ MINOR(dump_bdev->dev_id));
+
+
+ /* after opening the block device, return */
+ return retval;
+
+err3: dump_free_bio(dump_bdev->bio);
+ dump_bdev->bio = NULL;
+err2: if (bdev) blkdev_put(bdev);
+ goto err;
+err1: if (bdev) bdput(bdev);
+ dump_bdev->bdev = NULL;
+err: return retval;
+}
+
+/*
+ * Close the dump device and release associated resources
+ * Invoked when unconfiguring the dump device.
+ */
+static int
+dump_block_release(struct dump_dev *dev)
+{
+ struct dump_blockdev *dump_bdev = DUMP_BDEV(dev);
+
+ /* release earlier bdev if present */
+ if (dump_bdev->bdev) {
+ blkdev_put(dump_bdev->bdev);
+ dump_bdev->bdev = NULL;
+ }
+
+ dump_free_bio(dump_bdev->bio);
+ dump_bdev->bio = NULL;
+
+ return 0;
+}
+
+
+/*
+ * Prepare the dump device for use (silence any ongoing activity
+ * and quiesce state) when the system crashes.
+ */
+static int
+dump_block_silence(struct dump_dev *dev)
+{
+ struct dump_blockdev *dump_bdev = DUMP_BDEV(dev);
+ struct request_queue *q = bdev_get_queue(dump_bdev->bdev);
+ int ret;
+
+ /* If we can't get request queue lock, refuse to take the dump */
+ if (!spin_trylock(q->queue_lock))
+ return -EBUSY;
+
+ ret = elv_queue_empty(q);
+ spin_unlock(q->queue_lock);
+
+ /* For now we assume we have the device to ourselves */
+ /* Just a quick sanity check */
+ if (!ret) {
+ /* Warn the user and move on */
+ printk(KERN_ALERT "Warning: Non-empty request queue\n");
+ printk(KERN_ALERT "I/O requests in flight at dump time\n");
+ }
+
+ /*
+ * Move to a softer level of silencing where no spin_lock_irqs
+ * are held on other cpus
+ */
+ dump_silence_level = DUMP_SOFT_SPIN_CPUS;
+
+ ret = __dump_irq_enable();
+ if (ret) {
+ return ret;
+ }
+
+ printk("Dumping to block device (%d,%d) on CPU %d ...\n",
+ MAJOR(dump_bdev->dev_id), MINOR(dump_bdev->dev_id),
+ smp_processor_id());
+
+ return 0;
+}
+
+/*
+ * Invoked when dumping is done. This is the time to put things back
+ * (i.e. undo the effects of dump_block_silence) so the device is
+ * available for normal use.
+ */
+static int
+dump_block_resume(struct dump_dev *dev)
+{
+ __dump_irq_restore();
+ return 0;
+}
+
+
+/*
+ * Seek to the specified offset in the dump device.
+ * Makes sure this is a valid offset, otherwise returns an error.
+ */
+static int
+dump_block_seek(struct dump_dev *dev, loff_t off)
+{
+ struct dump_blockdev *dump_bdev = DUMP_BDEV(dev);
+ loff_t offset = off + dump_bdev->start_offset;
+
+ if (offset & ( PAGE_SIZE - 1)) {
+ printk("seek: non-page aligned\n");
+ return -EINVAL;
+ }
+
+ if (offset & (bdev_hardsect_size(dump_bdev->bdev) - 1)) {
+ printk("seek: not sector aligned \n");
+ return -EINVAL;
+ }
+
+ if (offset > dump_bdev->limit) {
+ printk("seek: not enough space left on device!\n");
+ return -ENOSPC;
+ }
+ dev->curr_offset = off;
+ return 0;
+}
+
+/*
+ * Write out a buffer after checking the device limitations,
+ * sector sizes, etc. Assumes the buffer is in directly mapped
+ * kernel address space (not vmalloc'ed).
+ *
+ * Returns: number of bytes written or -ERRNO.
+ */
+static int
+dump_block_write(struct dump_dev *dev, void *buf,
+ unsigned long len)
+{
+ struct dump_blockdev *dump_bdev = DUMP_BDEV(dev);
+ loff_t offset = dev->curr_offset + dump_bdev->start_offset;
+ int retval = -ENOSPC;
+
+ if (offset >= dump_bdev->limit) {
+ printk("write: not enough space left on device!\n");
+ goto out;
+ }
+
+ /* don't write more blocks than our max limit */
+ if (offset + len > dump_bdev->limit)
+ len = dump_bdev->limit - offset;
+
+
+ retval = dump_block_map(dump_bdev, buf, len);
+ if (retval){
+ printk("write: dump_block_map failed! err %d\n", retval);
+ goto out;
+ }
+
+ /*
+ * Write out the data to disk.
+ * Assumes the entire buffer mapped to a single bio, which we can
+ * submit and wait for io completion. In the future, may consider
+ * increasing the dump buffer size and submitting multiple bio s
+ * for better throughput.
+ */
+ dump_bdev->err = -EAGAIN;
+ submit_bio(WRITE, dump_bdev->bio);
+
+ dump_bdev->ddev.curr_offset += len;
+ retval = len;
+ out:
+ return retval;
+}
+
+/*
+ * Name: dump_block_ready()
+ * Func: check if the last dump i/o is over and ready for next request
+ */
+static int
+dump_block_ready(struct dump_dev *dev, void *buf)
+{
+ struct dump_blockdev *dump_bdev = DUMP_BDEV(dev);
+ request_queue_t *q = bdev_get_queue(dump_bdev->bio->bi_bdev);
+
+ /* check for io completion */
+ if (dump_bdev->err == -EAGAIN) {
+ q->unplug_fn(q);
+ return -EAGAIN;
+ }
+
+ if (dump_bdev->err) {
+ printk("dump i/o err\n");
+ return dump_bdev->err;
+ }
+
+ return 0;
+}
+
+
+struct dump_dev_ops dump_blockdev_ops = {
+ .open = dump_block_open,
+ .release = dump_block_release,
+ .silence = dump_block_silence,
+ .resume = dump_block_resume,
+ .seek = dump_block_seek,
+ .write = dump_block_write,
+ /* .read not implemented */
+ .ready = dump_block_ready
+};
+
+static struct dump_blockdev default_dump_blockdev = {
+ .ddev = {.type_name = "blockdev", .ops = &dump_blockdev_ops,
+ .curr_offset = 0},
+ /*
+ * leave enough room for the longest swap header possibly written
+ * written by mkswap (likely the largest page size supported by
+ * the arch
+ */
+ .start_offset = DUMP_HEADER_OFFSET,
+ .err = 0
+ /* assume the rest of the fields are zeroed by default */
+};
+
+struct dump_blockdev *dump_blockdev = &default_dump_blockdev;
+
+static int __init
+dump_blockdev_init(void)
+{
+ if (dump_register_device(&dump_blockdev->ddev) < 0) {
+ printk("block device driver registration failed\n");
+ return -1;
+ }
+
+ printk("block device driver for LKCD registered\n");
+ return 0;
+}
+
+static void __exit
+dump_blockdev_cleanup(void)
+{
+ dump_unregister_device(&dump_blockdev->ddev);
+ printk("block device driver for LKCD unregistered\n");
+}
+
+MODULE_AUTHOR("LKCD Development Team <lkcd-devel@lists.sourceforge.net>");
+MODULE_DESCRIPTION("Block Dump Driver for Linux Kernel Crash Dump (LKCD)");
+MODULE_LICENSE("GPL");
+
+module_init(dump_blockdev_init);
+module_exit(dump_blockdev_cleanup);
--- /dev/null
+/*
+ * The file has the common/generic dump execution code
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya <suparna@in.ibm.com>
+ * Split and rewrote high level dump execute code to make use
+ * of dump method interfaces.
+ *
+ * Derived from original code in dump_base.c created by
+ * Matt Robinson <yakker@sourceforge.net>)
+ *
+ * Copyright (C) 1999 - 2002 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * Assumes dumper and dump config settings are in place
+ * (invokes corresponding dumper specific routines as applicable)
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+#include <linux/kernel.h>
+#include <linux/notifier.h>
+#include <linux/dump.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include "dump_methods.h"
+
+struct notifier_block *dump_notifier_list; /* dump started/ended callback */
+
+extern int panic_timeout;
+
+/* Dump progress indicator */
+void
+dump_speedo(int i)
+{
+ static const char twiddle[4] = { '|', '\\', '-', '/' };
+ printk("%c\b", twiddle[i&3]);
+}
+
+/* Make the device ready and write out the header */
+int dump_begin(void)
+{
+ int err = 0;
+
+ /* dump_dev = dump_config.dumper->dev; */
+ dumper_reset();
+ if ((err = dump_dev_silence())) {
+ /* quiesce failed, can't risk continuing */
+ /* Todo/Future: switch to alternate dump scheme if possible */
+ printk("dump silence dev failed ! error %d\n", err);
+ return err;
+ }
+
+ pr_debug("Writing dump header\n");
+ if ((err = dump_update_header())) {
+ printk("dump update header failed ! error %d\n", err);
+ dump_dev_resume();
+ return err;
+ }
+
+ dump_config.dumper->curr_offset = DUMP_BUFFER_SIZE;
+
+ return 0;
+}
+
+/*
+ * Write the dump terminator, a final header update and let go of
+ * exclusive use of the device for dump.
+ */
+int dump_complete(void)
+{
+ int ret = 0;
+
+ if (dump_config.level != DUMP_LEVEL_HEADER) {
+ if ((ret = dump_update_end_marker())) {
+ printk("dump update end marker error %d\n", ret);
+ }
+ if ((ret = dump_update_header())) {
+ printk("dump update header error %d\n", ret);
+ }
+ }
+ ret = dump_dev_resume();
+
+ if ((panic_timeout > 0) && (!(dump_config.flags & (DUMP_FLAGS_SOFTBOOT | DUMP_FLAGS_NONDISRUPT)))) {
+ printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
+#ifdef CONFIG_SMP
+ smp_send_stop();
+#endif
+ mdelay(panic_timeout * 1000);
+ machine_restart(NULL);
+ }
+
+ return ret;
+}
+
+/* Saves all dump data */
+int dump_execute_savedump(void)
+{
+ int ret = 0, err = 0;
+
+ if ((ret = dump_begin())) {
+ return ret;
+ }
+
+ if (dump_config.level != DUMP_LEVEL_HEADER) {
+ ret = dump_sequencer();
+ }
+ if ((err = dump_complete())) {
+ printk("Dump complete failed. Error %d\n", err);
+ }
+
+ return ret;
+}
+
+extern void dump_calc_bootmap_pages(void);
+
+/* Does all the real work: Capture and save state */
+int dump_generic_execute(const char *panic_str, const struct pt_regs *regs)
+{
+ int ret = 0;
+
+ if ((ret = dump_configure_header(panic_str, regs))) {
+ printk("dump config header failed ! error %d\n", ret);
+ return ret;
+ }
+
+ dump_calc_bootmap_pages();
+ /* tell interested parties that a dump is about to start */
+ notifier_call_chain(&dump_notifier_list, DUMP_BEGIN,
+ &dump_config.dump_device);
+
+ if (dump_config.level != DUMP_LEVEL_NONE)
+ ret = dump_execute_savedump();
+
+ pr_debug("dumped %ld blocks of %d bytes each\n",
+ dump_config.dumper->count, DUMP_BUFFER_SIZE);
+
+ /* tell interested parties that a dump has completed */
+ notifier_call_chain(&dump_notifier_list, DUMP_END,
+ &dump_config.dump_device);
+
+ return ret;
+}
--- /dev/null
+/*
+ * Default filters to select data to dump for various passes.
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya <suparna@in.ibm.com>
+ * Split and rewrote default dump selection logic to generic dump
+ * method interfaces
+ * Derived from a portion of dump_base.c created by
+ * Matt Robinson <yakker@sourceforge.net>)
+ *
+ * Copyright (C) 1999 - 2002 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * Used during single-stage dumping and during stage 1 of the 2-stage scheme
+ * (Stage 2 of the 2-stage scheme uses the fully transparent filters
+ * i.e. passthru filters in dump_overlay.c)
+ *
+ * Future: Custom selective dump may involve a different set of filters.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/dump.h>
+#include "dump_methods.h"
+
+#define DUMP_PFN_SAFETY_MARGIN 1024 /* 4 MB */
+static unsigned long bootmap_pages;
+
+/* Copied from mm/bootmem.c - FIXME */
+/* return the number of _pages_ that will be allocated for the boot bitmap */
+void dump_calc_bootmap_pages (void)
+{
+ unsigned long mapsize;
+ unsigned long pages = num_physpages;
+
+ mapsize = (pages+7)/8;
+ mapsize = (mapsize + ~PAGE_MASK) & PAGE_MASK;
+ mapsize >>= PAGE_SHIFT;
+ bootmap_pages = mapsize + DUMP_PFN_SAFETY_MARGIN + 1;
+}
+
+
+/* temporary */
+extern unsigned long min_low_pfn;
+
+
+int dump_low_page(struct page *p)
+{
+ return ((page_to_pfn(p) >= min_low_pfn) &&
+ (page_to_pfn(p) < (min_low_pfn + bootmap_pages)));
+}
+
+static inline int kernel_page(struct page *p)
+{
+ /* FIXME: Need to exclude hugetlb pages. Clue: reserved but inuse */
+ return (PageReserved(p) && !PageInuse(p)) || (!PageLRU(p) && PageInuse(p));
+}
+
+static inline int user_page(struct page *p)
+{
+ return PageInuse(p) && (!PageReserved(p) && PageLRU(p));
+}
+
+static inline int unreferenced_page(struct page *p)
+{
+ return !PageInuse(p) && !PageReserved(p);
+}
+
+
+/* loc marks the beginning of a range of pages */
+int dump_filter_kernpages(int pass, unsigned long loc, unsigned long sz)
+{
+ struct page *page = (struct page *)loc;
+ /* if any of the pages is a kernel page, select this set */
+ while (sz) {
+ if (dump_low_page(page) || kernel_page(page))
+ return 1;
+ sz -= PAGE_SIZE;
+ page++;
+ }
+ return 0;
+}
+
+
+/* loc marks the beginning of a range of pages */
+int dump_filter_userpages(int pass, unsigned long loc, unsigned long sz)
+{
+ struct page *page = (struct page *)loc;
+ int ret = 0;
+ /* select if the set has any user page, and no kernel pages */
+ while (sz) {
+ if (user_page(page) && !dump_low_page(page)) {
+ ret = 1;
+ } else if (kernel_page(page) || dump_low_page(page)) {
+ return 0;
+ }
+ page++;
+ sz -= PAGE_SIZE;
+ }
+ return ret;
+}
+
+
+
+/* loc marks the beginning of a range of pages */
+int dump_filter_unusedpages(int pass, unsigned long loc, unsigned long sz)
+{
+ struct page *page = (struct page *)loc;
+
+ /* select if the set does not have any used pages */
+ while (sz) {
+ if (!unreferenced_page(page) || dump_low_page(page)) {
+ return 0;
+ }
+ page++;
+ sz -= PAGE_SIZE;
+ }
+ return 1;
+}
+
+/* dummy: last (non-existent) pass */
+int dump_filter_none(int pass, unsigned long loc, unsigned long sz)
+{
+ return 0;
+}
+
+/* TBD: resolve level bitmask ? */
+struct dump_data_filter dump_filter_table[] = {
+ { .name = "kern", .selector = dump_filter_kernpages,
+ .level_mask = DUMP_MASK_KERN},
+ { .name = "user", .selector = dump_filter_userpages,
+ .level_mask = DUMP_MASK_USED},
+ { .name = "unused", .selector = dump_filter_unusedpages,
+ .level_mask = DUMP_MASK_UNUSED},
+ { .name = "none", .selector = dump_filter_none,
+ .level_mask = DUMP_MASK_REST},
+ { .name = "", .selector = NULL, .level_mask = 0}
+};
+
--- /dev/null
+/*
+ * Implements the routines which handle the format specific
+ * aspects of dump for the default dump format.
+ *
+ * Used in single stage dumping and stage 1 of soft-boot based dumping
+ * Saves data in LKCD (lcrash) format
+ *
+ * Previously a part of dump_base.c
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya <suparna@in.ibm.com>
+ * Split off and reshuffled LKCD dump format code around generic
+ * dump method interfaces.
+ *
+ * Derived from original code created by
+ * Matt Robinson <yakker@sourceforge.net>)
+ *
+ * Contributions from SGI, IBM, HP, MCL, and others.
+ *
+ * Copyright (C) 1999 - 2002 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2000 - 2002 TurboLinux, Inc. All rights reserved.
+ * Copyright (C) 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/utsname.h>
+#include <asm/dump.h>
+#include <linux/dump.h>
+#include "dump_methods.h"
+
+/*
+ * SYSTEM DUMP LAYOUT
+ *
+ * System dumps are currently the combination of a dump header and a set
+ * of data pages which contain the system memory. The layout of the dump
+ * (for full dumps) is as follows:
+ *
+ * +-----------------------------+
+ * | generic dump header |
+ * +-----------------------------+
+ * | architecture dump header |
+ * +-----------------------------+
+ * | page header |
+ * +-----------------------------+
+ * | page data |
+ * +-----------------------------+
+ * | page header |
+ * +-----------------------------+
+ * | page data |
+ * +-----------------------------+
+ * | | |
+ * | | |
+ * | | |
+ * | | |
+ * | V |
+ * +-----------------------------+
+ * | PAGE_END header |
+ * +-----------------------------+
+ *
+ * There are two dump headers, the first which is architecture
+ * independent, and the other which is architecture dependent. This
+ * allows different architectures to dump different data structures
+ * which are specific to their chipset, CPU, etc.
+ *
+ * After the dump headers come a succession of dump page headers along
+ * with dump pages. The page header contains information about the page
+ * size, any flags associated with the page (whether it's compressed or
+ * not), and the address of the page. After the page header is the page
+ * data, which is either compressed (or not). Each page of data is
+ * dumped in succession, until the final dump header (PAGE_END) is
+ * placed at the end of the dump, assuming the dump device isn't out
+ * of space.
+ *
+ * This mechanism allows for multiple compression types, different
+ * types of data structures, different page ordering, etc., etc., etc.
+ * It's a very straightforward mechanism for dumping system memory.
+ */
+
+struct __dump_header dump_header; /* the primary dump header */
+struct __dump_header_asm dump_header_asm; /* the arch-specific dump header */
+
+/*
+ * Set up common header fields (mainly the arch indep section)
+ * Per-cpu state is handled by lcrash_save_context
+ * Returns the size of the header in bytes.
+ */
+static int lcrash_init_dump_header(const char *panic_str)
+{
+ struct timeval dh_time;
+ unsigned long temp_dha_stack[DUMP_MAX_NUM_CPUS];
+ u64 temp_memsz = dump_header.dh_memory_size;
+
+ /* make sure the dump header isn't TOO big */
+ if ((sizeof(struct __dump_header) +
+ sizeof(struct __dump_header_asm)) > DUMP_BUFFER_SIZE) {
+ printk("lcrash_init_header(): combined "
+ "headers larger than DUMP_BUFFER_SIZE!\n");
+ return -E2BIG;
+ }
+
+ /* initialize the dump headers to zero */
+ /* save dha_stack pointer because it may contains pointer for stack! */
+ memcpy(&(temp_dha_stack[0]), &(dump_header_asm.dha_stack[0]),
+ DUMP_MAX_NUM_CPUS * sizeof(unsigned long));
+ memset(&dump_header, 0, sizeof(dump_header));
+ memset(&dump_header_asm, 0, sizeof(dump_header_asm));
+ dump_header.dh_memory_size = temp_memsz;
+ memcpy(&(dump_header_asm.dha_stack[0]), &(temp_dha_stack[0]),
+ DUMP_MAX_NUM_CPUS * sizeof(unsigned long));
+
+ /* configure dump header values */
+ dump_header.dh_magic_number = DUMP_MAGIC_NUMBER;
+ dump_header.dh_version = DUMP_VERSION_NUMBER;
+ dump_header.dh_memory_start = PAGE_OFFSET;
+ dump_header.dh_memory_end = DUMP_MAGIC_NUMBER;
+ dump_header.dh_header_size = sizeof(struct __dump_header);
+ dump_header.dh_page_size = PAGE_SIZE;
+ dump_header.dh_dump_level = dump_config.level;
+ dump_header.dh_current_task = (unsigned long) current;
+ dump_header.dh_dump_compress = dump_config.dumper->compress->
+ compress_type;
+ dump_header.dh_dump_flags = dump_config.flags;
+ dump_header.dh_dump_device = dump_config.dumper->dev->device_id;
+
+#if DUMP_DEBUG >= 6
+ dump_header.dh_num_bytes = 0;
+#endif
+ dump_header.dh_num_dump_pages = 0;
+ do_gettimeofday(&dh_time);
+ dump_header.dh_time.tv_sec = dh_time.tv_sec;
+ dump_header.dh_time.tv_usec = dh_time.tv_usec;
+
+ memcpy((void *)&(dump_header.dh_utsname_sysname),
+ (const void *)&(system_utsname.sysname), __NEW_UTS_LEN + 1);
+ memcpy((void *)&(dump_header.dh_utsname_nodename),
+ (const void *)&(system_utsname.nodename), __NEW_UTS_LEN + 1);
+ memcpy((void *)&(dump_header.dh_utsname_release),
+ (const void *)&(system_utsname.release), __NEW_UTS_LEN + 1);
+ memcpy((void *)&(dump_header.dh_utsname_version),
+ (const void *)&(system_utsname.version), __NEW_UTS_LEN + 1);
+ memcpy((void *)&(dump_header.dh_utsname_machine),
+ (const void *)&(system_utsname.machine), __NEW_UTS_LEN + 1);
+ memcpy((void *)&(dump_header.dh_utsname_domainname),
+ (const void *)&(system_utsname.domainname), __NEW_UTS_LEN + 1);
+
+ if (panic_str) {
+ memcpy((void *)&(dump_header.dh_panic_string),
+ (const void *)panic_str, DUMP_PANIC_LEN);
+ }
+
+ dump_header_asm.dha_magic_number = DUMP_ASM_MAGIC_NUMBER;
+ dump_header_asm.dha_version = DUMP_ASM_VERSION_NUMBER;
+ dump_header_asm.dha_header_size = sizeof(dump_header_asm);
+#ifdef CONFIG_ARM
+ dump_header_asm.dha_physaddr_start = PHYS_OFFSET;
+#endif
+
+ dump_header_asm.dha_smp_num_cpus = num_online_cpus();
+ pr_debug("smp_num_cpus in header %d\n",
+ dump_header_asm.dha_smp_num_cpus);
+
+ dump_header_asm.dha_dumping_cpu = smp_processor_id();
+
+ return sizeof(dump_header) + sizeof(dump_header_asm);
+}
+
+
+int dump_lcrash_configure_header(const char *panic_str,
+ const struct pt_regs *regs)
+{
+ int retval = 0;
+
+ dump_config.dumper->header_len = lcrash_init_dump_header(panic_str);
+
+ /* capture register states for all processors */
+ dump_save_this_cpu(regs);
+ __dump_save_other_cpus(); /* side effect:silence cpus */
+
+ /* configure architecture-specific dump header values */
+ if ((retval = __dump_configure_header(regs)))
+ return retval;
+
+ dump_config.dumper->header_dirty++;
+ return 0;
+}
+
+/* save register and task context */
+void dump_lcrash_save_context(int cpu, const struct pt_regs *regs,
+ struct task_struct *tsk)
+{
+ dump_header_asm.dha_smp_current_task[cpu] = (unsigned long)tsk;
+
+ __dump_save_regs(&dump_header_asm.dha_smp_regs[cpu], regs);
+
+ /* take a snapshot of the stack */
+ /* doing this enables us to tolerate slight drifts on this cpu */
+ if (dump_header_asm.dha_stack[cpu]) {
+ memcpy((void *)dump_header_asm.dha_stack[cpu],
+ tsk->thread_info, THREAD_SIZE);
+ }
+ dump_header_asm.dha_stack_ptr[cpu] = (unsigned long)(tsk->thread_info);
+}
+
+/* write out the header */
+int dump_write_header(void)
+{
+ int retval = 0, size;
+ void *buf = dump_config.dumper->dump_buf;
+
+ /* accounts for DUMP_HEADER_OFFSET if applicable */
+ if ((retval = dump_dev_seek(0))) {
+ printk("Unable to seek to dump header offset: %d\n",
+ retval);
+ return retval;
+ }
+
+ memcpy(buf, (void *)&dump_header, sizeof(dump_header));
+ size = sizeof(dump_header);
+ memcpy(buf + size, (void *)&dump_header_asm, sizeof(dump_header_asm));
+ size += sizeof(dump_header_asm);
+ size = PAGE_ALIGN(size);
+ retval = dump_ll_write(buf , size);
+
+ if (retval < size)
+ return (retval >= 0) ? ENOSPC : retval;
+ return 0;
+}
+
+int dump_generic_update_header(void)
+{
+ int err = 0;
+
+ if (dump_config.dumper->header_dirty) {
+ if ((err = dump_write_header())) {
+ printk("dump write header failed !err %d\n", err);
+ } else {
+ dump_config.dumper->header_dirty = 0;
+ }
+ }
+
+ return err;
+}
+
+static inline int is_curr_stack_page(struct page *page, unsigned long size)
+{
+ unsigned long thread_addr = (unsigned long)current_thread_info();
+ unsigned long addr = (unsigned long)page_address(page);
+
+ return !PageHighMem(page) && (addr < thread_addr + THREAD_SIZE)
+ && (addr + size > thread_addr);
+}
+
+static inline int is_dump_page(struct page *page, unsigned long size)
+{
+ unsigned long addr = (unsigned long)page_address(page);
+ unsigned long dump_buf = (unsigned long)dump_config.dumper->dump_buf;
+
+ return !PageHighMem(page) && (addr < dump_buf + DUMP_BUFFER_SIZE)
+ && (addr + size > dump_buf);
+}
+
+int dump_allow_compress(struct page *page, unsigned long size)
+{
+ /*
+ * Don't compress the page if any part of it overlaps
+ * with the current stack or dump buffer (since the contents
+ * in these could be changing while compression is going on)
+ */
+ return !is_curr_stack_page(page, size) && !is_dump_page(page, size);
+}
+
+void lcrash_init_pageheader(struct __dump_page *dp, struct page *page,
+ unsigned long sz)
+{
+ memset(dp, sizeof(struct __dump_page), 0);
+ dp->dp_flags = 0;
+ dp->dp_size = 0;
+ if (sz > 0)
+ dp->dp_address = (loff_t)page_to_pfn(page) << PAGE_SHIFT;
+
+#if DUMP_DEBUG > 6
+ dp->dp_page_index = dump_header.dh_num_dump_pages;
+ dp->dp_byte_offset = dump_header.dh_num_bytes + DUMP_BUFFER_SIZE
+ + DUMP_HEADER_OFFSET; /* ?? */
+#endif /* DUMP_DEBUG */
+}
+
+int dump_lcrash_add_data(unsigned long loc, unsigned long len)
+{
+ struct page *page = (struct page *)loc;
+ void *addr, *buf = dump_config.dumper->curr_buf;
+ struct __dump_page *dp = (struct __dump_page *)buf;
+ int bytes, size;
+
+ if (buf > dump_config.dumper->dump_buf + DUMP_BUFFER_SIZE)
+ return -ENOMEM;
+
+ lcrash_init_pageheader(dp, page, len);
+ buf += sizeof(struct __dump_page);
+
+ while (len) {
+ addr = kmap_atomic(page, KM_DUMP);
+ size = bytes = (len > PAGE_SIZE) ? PAGE_SIZE : len;
+ /* check for compression */
+ if (dump_allow_compress(page, bytes)) {
+ size = dump_compress_data((char *)addr, bytes, (char *)buf);
+ }
+ /* set the compressed flag if the page did compress */
+ if (size && (size < bytes)) {
+ dp->dp_flags |= DUMP_DH_COMPRESSED;
+ } else {
+ /* compression failed -- default to raw mode */
+ dp->dp_flags |= DUMP_DH_RAW;
+ memcpy(buf, addr, bytes);
+ size = bytes;
+ }
+ /* memset(buf, 'A', size); temporary: testing only !! */
+ kunmap_atomic(addr, KM_DUMP);
+ dp->dp_size += size;
+ buf += size;
+ len -= bytes;
+ page++;
+ }
+
+ /* now update the header */
+#if DUMP_DEBUG > 6
+ dump_header.dh_num_bytes += dp->dp_size + sizeof(*dp);
+#endif
+ dump_header.dh_num_dump_pages++;
+ dump_config.dumper->header_dirty++;
+
+ dump_config.dumper->curr_buf = buf;
+
+ return len;
+}
+
+int dump_lcrash_update_end_marker(void)
+{
+ struct __dump_page *dp =
+ (struct __dump_page *)dump_config.dumper->curr_buf;
+ unsigned long left;
+ int ret = 0;
+
+ lcrash_init_pageheader(dp, NULL, 0);
+ dp->dp_flags |= DUMP_DH_END; /* tbd: truncation test ? */
+
+ /* now update the header */
+#if DUMP_DEBUG > 6
+ dump_header.dh_num_bytes += sizeof(*dp);
+#endif
+ dump_config.dumper->curr_buf += sizeof(*dp);
+ left = dump_config.dumper->curr_buf - dump_config.dumper->dump_buf;
+
+ printk("\n");
+
+ while (left) {
+ if ((ret = dump_dev_seek(dump_config.dumper->curr_offset))) {
+ printk("Seek failed at offset 0x%llx\n",
+ dump_config.dumper->curr_offset);
+ return ret;
+ }
+
+ if (DUMP_BUFFER_SIZE > left)
+ memset(dump_config.dumper->curr_buf, 'm',
+ DUMP_BUFFER_SIZE - left);
+
+ if ((ret = dump_ll_write(dump_config.dumper->dump_buf,
+ DUMP_BUFFER_SIZE)) < DUMP_BUFFER_SIZE) {
+ return (ret < 0) ? ret : -ENOSPC;
+ }
+
+ dump_config.dumper->curr_offset += DUMP_BUFFER_SIZE;
+
+ if (left > DUMP_BUFFER_SIZE) {
+ left -= DUMP_BUFFER_SIZE;
+ memcpy(dump_config.dumper->dump_buf,
+ dump_config.dumper->dump_buf + DUMP_BUFFER_SIZE, left);
+ dump_config.dumper->curr_buf -= DUMP_BUFFER_SIZE;
+ } else {
+ left = 0;
+ }
+ }
+ return 0;
+}
+
+
+/* Default Formatter (lcrash) */
+struct dump_fmt_ops dump_fmt_lcrash_ops = {
+ .configure_header = dump_lcrash_configure_header,
+ .update_header = dump_generic_update_header,
+ .save_context = dump_lcrash_save_context,
+ .add_data = dump_lcrash_add_data,
+ .update_end_marker = dump_lcrash_update_end_marker
+};
+
+struct dump_fmt dump_fmt_lcrash = {
+ .name = "lcrash",
+ .ops = &dump_fmt_lcrash_ops
+};
+
--- /dev/null
+/*
+ * GZIP Compression functions for kernel crash dumps.
+ *
+ * Created by: Matt Robinson (yakker@sourceforge.net)
+ * Copyright 2001 Matt D. Robinson. All rights reserved.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/* header files */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/dump.h>
+#include <linux/zlib.h>
+#include <linux/vmalloc.h>
+
+static void *deflate_workspace;
+
+/*
+ * Name: dump_compress_gzip()
+ * Func: Compress a DUMP_PAGE_SIZE page using gzip-style algorithms (the.
+ * deflate functions similar to what's used in PPP).
+ */
+static u16
+dump_compress_gzip(const u8 *old, u16 oldsize, u8 *new, u16 newsize)
+{
+ /* error code and dump stream */
+ int err;
+ z_stream dump_stream;
+
+ dump_stream.workspace = deflate_workspace;
+
+ if ((err = zlib_deflateInit(&dump_stream, Z_BEST_COMPRESSION)) != Z_OK) {
+ /* fall back to RLE compression */
+ printk("dump_compress_gzip(): zlib_deflateInit() "
+ "failed (%d)!\n", err);
+ return 0;
+ }
+
+ /* use old (page of memory) and size (DUMP_PAGE_SIZE) as in-streams */
+ dump_stream.next_in = (u8 *) old;
+ dump_stream.avail_in = oldsize;
+
+ /* out streams are new (dpcpage) and new size (DUMP_DPC_PAGE_SIZE) */
+ dump_stream.next_out = new;
+ dump_stream.avail_out = newsize;
+
+ /* deflate the page -- check for error */
+ err = zlib_deflate(&dump_stream, Z_FINISH);
+ if (err != Z_STREAM_END) {
+ /* zero is return code here */
+ (void)zlib_deflateEnd(&dump_stream);
+ printk("dump_compress_gzip(): zlib_deflate() failed (%d)!\n",
+ err);
+ return 0;
+ }
+
+ /* let's end the deflated compression stream */
+ if ((err = zlib_deflateEnd(&dump_stream)) != Z_OK) {
+ printk("dump_compress_gzip(): zlib_deflateEnd() "
+ "failed (%d)!\n", err);
+ }
+
+ /* return the compressed byte total (if it's smaller) */
+ if (dump_stream.total_out >= oldsize) {
+ return oldsize;
+ }
+ return dump_stream.total_out;
+}
+
+/* setup the gzip compression functionality */
+static struct __dump_compress dump_gzip_compression = {
+ .compress_type = DUMP_COMPRESS_GZIP,
+ .compress_func = dump_compress_gzip,
+ .compress_name = "GZIP",
+};
+
+/*
+ * Name: dump_compress_gzip_init()
+ * Func: Initialize gzip as a compression mechanism.
+ */
+static int __init
+dump_compress_gzip_init(void)
+{
+ deflate_workspace = vmalloc(zlib_deflate_workspacesize());
+ if (!deflate_workspace) {
+ printk("dump_compress_gzip_init(): Failed to "
+ "alloc %d bytes for deflate workspace\n",
+ zlib_deflate_workspacesize());
+ return -ENOMEM;
+ }
+ dump_register_compression(&dump_gzip_compression);
+ return 0;
+}
+
+/*
+ * Name: dump_compress_gzip_cleanup()
+ * Func: Remove gzip as a compression mechanism.
+ */
+static void __exit
+dump_compress_gzip_cleanup(void)
+{
+ vfree(deflate_workspace);
+ dump_unregister_compression(DUMP_COMPRESS_GZIP);
+}
+
+/* module initialization */
+module_init(dump_compress_gzip_init);
+module_exit(dump_compress_gzip_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("LKCD Development Team <lkcd-devel@lists.sourceforge.net>");
+MODULE_DESCRIPTION("Gzip compression module for crash dump driver");
--- /dev/null
+/*
+ * Architecture specific (i386) functions for Linux crash dumps.
+ *
+ * Created by: Matt Robinson (yakker@sgi.com)
+ *
+ * Copyright 1999 Silicon Graphics, Inc. All rights reserved.
+ *
+ * 2.3 kernel modifications by: Matt D. Robinson (yakker@turbolinux.com)
+ * Copyright 2000 TurboLinux, Inc. All rights reserved.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/*
+ * The hooks for dumping the kernel virtual memory to disk are in this
+ * file. Any time a modification is made to the virtual memory mechanism,
+ * these routines must be changed to use the new mechanisms.
+ */
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/fs.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/dump.h>
+#include "dump_methods.h"
+#include <linux/irq.h>
+
+#include <asm/processor.h>
+#include <asm/e820.h>
+#include <asm/hardirq.h>
+#include <asm/nmi.h>
+
+static __s32 saved_irq_count; /* saved preempt_count() flags */
+
+static int
+alloc_dha_stack(void)
+{
+ int i;
+ void *ptr;
+
+ if (dump_header_asm.dha_stack[0])
+ return 0;
+
+ ptr = vmalloc(THREAD_SIZE * num_online_cpus());
+ if (!ptr) {
+ printk("vmalloc for dha_stacks failed\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < num_online_cpus(); i++) {
+ dump_header_asm.dha_stack[i] = (u32)((unsigned long)ptr +
+ (i * THREAD_SIZE));
+ }
+ return 0;
+}
+
+static int
+free_dha_stack(void)
+{
+ if (dump_header_asm.dha_stack[0]) {
+ vfree((void *)dump_header_asm.dha_stack[0]);
+ dump_header_asm.dha_stack[0] = 0;
+ }
+ return 0;
+}
+
+
+void
+__dump_save_regs(struct pt_regs *dest_regs, const struct pt_regs *regs)
+{
+ *dest_regs = *regs;
+
+ /* In case of panic dumps, we collects regs on entry to panic.
+ * so, we shouldn't 'fix' ssesp here again. But it is hard to
+ * tell just looking at regs whether ssesp need fixing. We make
+ * this decision by looking at xss in regs. If we have better
+ * means to determine that ssesp are valid (by some flag which
+ * tells that we are here due to panic dump), then we can use
+ * that instead of this kludge.
+ */
+ if (!user_mode(regs)) {
+ if ((0xffff & regs->xss) == __KERNEL_DS)
+ /* already fixed up */
+ return;
+ dest_regs->esp = (unsigned long)&(regs->esp);
+ __asm__ __volatile__ ("movw %%ss, %%ax;"
+ :"=a"(dest_regs->xss));
+ }
+}
+
+
+#ifdef CONFIG_SMP
+extern cpumask_t irq_affinity[];
+extern irq_desc_t irq_desc[];
+extern void dump_send_ipi(void);
+
+static int dump_expect_ipi[NR_CPUS];
+static atomic_t waiting_for_dump_ipi;
+static cpumask_t saved_affinity[NR_IRQS];
+
+extern void stop_this_cpu(void *); /* exported by i386 kernel */
+
+static int
+dump_nmi_callback(struct pt_regs *regs, int cpu)
+{
+ if (!dump_expect_ipi[cpu])
+ return 0;
+
+ dump_expect_ipi[cpu] = 0;
+
+ dump_save_this_cpu(regs);
+ atomic_dec(&waiting_for_dump_ipi);
+
+ level_changed:
+ switch (dump_silence_level) {
+ case DUMP_HARD_SPIN_CPUS: /* Spin until dump is complete */
+ while (dump_oncpu) {
+ barrier(); /* paranoia */
+ if (dump_silence_level != DUMP_HARD_SPIN_CPUS)
+ goto level_changed;
+
+ cpu_relax(); /* kill time nicely */
+ }
+ break;
+
+ case DUMP_HALT_CPUS: /* Execute halt */
+ stop_this_cpu(NULL);
+ break;
+
+ case DUMP_SOFT_SPIN_CPUS:
+ /* Mark the task so it spins in schedule */
+ set_tsk_thread_flag(current, TIF_NEED_RESCHED);
+ break;
+ }
+
+ return 1;
+}
+
+/* save registers on other processors */
+void
+__dump_save_other_cpus(void)
+{
+ int i, cpu = smp_processor_id();
+ int other_cpus = num_online_cpus()-1;
+
+ if (other_cpus > 0) {
+ atomic_set(&waiting_for_dump_ipi, other_cpus);
+
+ for (i = 0; i < NR_CPUS; i++) {
+ dump_expect_ipi[i] = (i != cpu && cpu_online(i));
+ }
+
+ /* short circuit normal NMI handling temporarily */
+ set_nmi_callback(dump_nmi_callback);
+ wmb();
+
+ dump_send_ipi();
+ /* may be we dont need to wait for NMI to be processed.
+ just write out the header at the end of dumping, if
+ this IPI is not processed until then, there probably
+ is a problem and we just fail to capture state of
+ other cpus. */
+ while(atomic_read(&waiting_for_dump_ipi) > 0) {
+ cpu_relax();
+ }
+
+ unset_nmi_callback();
+ }
+}
+
+/*
+ * Routine to save the old irq affinities and change affinities of all irqs to
+ * the dumping cpu.
+ */
+static void
+set_irq_affinity(void)
+{
+ int i;
+ cpumask_t cpu = CPU_MASK_NONE;
+
+ cpu_set(smp_processor_id(), cpu);
+ memcpy(saved_affinity, irq_affinity, NR_IRQS * sizeof(unsigned long));
+ for (i = 0; i < NR_IRQS; i++) {
+ if (irq_desc[i].handler == NULL)
+ continue;
+ irq_affinity[i] = cpu;
+ if (irq_desc[i].handler->set_affinity != NULL)
+ irq_desc[i].handler->set_affinity(i, irq_affinity[i]);
+ }
+}
+
+/*
+ * Restore old irq affinities.
+ */
+static void
+reset_irq_affinity(void)
+{
+ int i;
+
+ memcpy(irq_affinity, saved_affinity, NR_IRQS * sizeof(unsigned long));
+ for (i = 0; i < NR_IRQS; i++) {
+ if (irq_desc[i].handler == NULL)
+ continue;
+ if (irq_desc[i].handler->set_affinity != NULL)
+ irq_desc[i].handler->set_affinity(i, saved_affinity[i]);
+ }
+}
+
+#else /* !CONFIG_SMP */
+#define set_irq_affinity() do { } while (0)
+#define reset_irq_affinity() do { } while (0)
+#define save_other_cpu_states() do { } while (0)
+#endif /* !CONFIG_SMP */
+
+/*
+ * Kludge - dump from interrupt context is unreliable (Fixme)
+ *
+ * We do this so that softirqs initiated for dump i/o
+ * get processed and we don't hang while waiting for i/o
+ * to complete or in any irq synchronization attempt.
+ *
+ * This is not quite legal of course, as it has the side
+ * effect of making all interrupts & softirqs triggered
+ * while dump is in progress complete before currently
+ * pending softirqs and the currently executing interrupt
+ * code.
+ */
+static inline void
+irq_bh_save(void)
+{
+ saved_irq_count = irq_count();
+ preempt_count() &= ~(HARDIRQ_MASK|SOFTIRQ_MASK);
+}
+
+static inline void
+irq_bh_restore(void)
+{
+ preempt_count() |= saved_irq_count;
+}
+
+/*
+ * Name: __dump_irq_enable
+ * Func: Reset system so interrupts are enabled.
+ * This is used for dump methods that require interrupts
+ * Eventually, all methods will have interrupts disabled
+ * and this code can be removed.
+ *
+ * Change irq affinities
+ * Re-enable interrupts
+ */
+int
+__dump_irq_enable(void)
+{
+ set_irq_affinity();
+ irq_bh_save();
+ local_irq_enable();
+ return 0;
+}
+
+/*
+ * Name: __dump_irq_restore
+ * Func: Resume the system state in an architecture-specific way.
+
+ */
+void
+__dump_irq_restore(void)
+{
+ local_irq_disable();
+ reset_irq_affinity();
+ irq_bh_restore();
+}
+
+/*
+ * Name: __dump_configure_header()
+ * Func: Meant to fill in arch specific header fields except per-cpu state
+ * already captured via __dump_save_context for all CPUs.
+ */
+int
+__dump_configure_header(const struct pt_regs *regs)
+{
+ return (0);
+}
+
+/*
+ * Name: __dump_init()
+ * Func: Initialize the dumping routine process.
+ */
+void
+__dump_init(uint64_t local_memory_start)
+{
+ return;
+}
+
+/*
+ * Name: __dump_open()
+ * Func: Open the dump device (architecture specific).
+ */
+void
+__dump_open(void)
+{
+ alloc_dha_stack();
+}
+
+/*
+ * Name: __dump_cleanup()
+ * Func: Free any architecture specific data structures. This is called
+ * when the dump module is being removed.
+ */
+void
+__dump_cleanup(void)
+{
+ free_dha_stack();
+}
+
+extern int pfn_is_ram(unsigned long);
+
+/*
+ * Name: __dump_page_valid()
+ * Func: Check if page is valid to dump.
+ */
+int
+__dump_page_valid(unsigned long index)
+{
+ if (!pfn_valid(index))
+ return 0;
+
+ return pfn_is_ram(index);
+}
+
+/*
+ * Name: manual_handle_crashdump()
+ * Func: Interface for the lkcd dump command. Calls dump_execute()
+ */
+int
+manual_handle_crashdump(void) {
+
+ struct pt_regs regs;
+
+ get_current_regs(®s);
+ dump_execute("manual", ®s);
+ return 0;
+}
--- /dev/null
+/*
+ * Implements the dump driver interface for saving a dump in available
+ * memory areas. The saved pages may be written out to persistent storage
+ * after a soft reboot.
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya <suparna@in.ibm.com>
+ *
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ *
+ * The approach of tracking pages containing saved dump using map pages
+ * allocated as needed has been derived from the Mission Critical Linux
+ * mcore dump implementation.
+ *
+ * Credits and a big thanks for letting the lkcd project make use of
+ * the excellent piece of work and also helping with clarifications
+ * and tips along the way are due to:
+ * Dave Winchell <winchell@mclx.com> (primary author of mcore)
+ * Jeff Moyer <moyer@mclx.com>
+ * Josh Huber <huber@mclx.com>
+ *
+ * For those familiar with the mcore code, the main differences worth
+ * noting here (besides the dump device abstraction) result from enabling
+ * "high" memory pages (pages not permanently mapped in the kernel
+ * address space) to be used for saving dump data (because of which a
+ * simple virtual address based linked list cannot be used anymore for
+ * managing free pages), an added level of indirection for faster
+ * lookups during the post-boot stage, and the idea of pages being
+ * made available as they get freed up while dump to memory progresses
+ * rather than one time before starting the dump. The last point enables
+ * a full memory snapshot to be saved starting with an initial set of
+ * bootstrap pages given a good compression ratio. (See dump_overlay.c)
+ *
+ */
+
+/*
+ * -----------------MEMORY LAYOUT ------------------
+ * The memory space consists of a set of discontiguous pages, and
+ * discontiguous map pages as well, rooted in a chain of indirect
+ * map pages (also discontiguous). Except for the indirect maps
+ * (which must be preallocated in advance), the rest of the pages
+ * could be in high memory.
+ *
+ * root
+ * | --------- -------- --------
+ * --> | . . +|--->| . +|------->| . . | indirect
+ * --|--|--- ---|---- --|-|--- maps
+ * | | | | |
+ * ------ ------ ------- ------ -------
+ * | . | | . | | . . | | . | | . . | maps
+ * --|--- --|--- --|--|-- --|--- ---|-|--
+ * page page page page page page page data
+ * pages
+ *
+ * Writes to the dump device happen sequentially in append mode.
+ * The main reason for the existence of the indirect map is
+ * to enable a quick way to lookup a specific logical offset in
+ * the saved data post-soft-boot, e.g. to writeout pages
+ * with more critical data first, even though such pages
+ * would have been compressed and copied last, being the lowest
+ * ranked candidates for reuse due to their criticality.
+ * (See dump_overlay.c)
+ */
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+#include <linux/dump.h>
+#include "dump_methods.h"
+
+#define DUMP_MAP_SZ (PAGE_SIZE / sizeof(unsigned long)) /* direct map size */
+#define DUMP_IND_MAP_SZ DUMP_MAP_SZ - 1 /* indirect map size */
+#define DUMP_NR_BOOTSTRAP 64 /* no of bootstrap pages */
+
+extern int dump_low_page(struct page *);
+
+/* check if the next entry crosses a page boundary */
+static inline int is_last_map_entry(unsigned long *map)
+{
+ unsigned long addr = (unsigned long)(map + 1);
+
+ return (!(addr & (PAGE_SIZE - 1)));
+}
+
+/* Todo: should have some validation checks */
+/* The last entry in the indirect map points to the next indirect map */
+/* Indirect maps are referred to directly by virtual address */
+static inline unsigned long *next_indirect_map(unsigned long *map)
+{
+ return (unsigned long *)map[DUMP_IND_MAP_SZ];
+}
+
+#ifdef CONFIG_CRASH_DUMP_SOFTBOOT
+/* Called during early bootup - fixme: make this __init */
+void dump_early_reserve_map(struct dump_memdev *dev)
+{
+ unsigned long *map1, *map2;
+ loff_t off = 0, last = dev->last_used_offset >> PAGE_SHIFT;
+ int i, j;
+
+ printk("Reserve bootmap space holding previous dump of %lld pages\n",
+ last);
+ map1= (unsigned long *)dev->indirect_map_root;
+
+ while (map1 && (off < last)) {
+ reserve_bootmem(virt_to_phys((void *)map1), PAGE_SIZE);
+ for (i=0; (i < DUMP_MAP_SZ - 1) && map1[i] && (off < last);
+ i++, off += DUMP_MAP_SZ) {
+ pr_debug("indirect map[%d] = 0x%lx\n", i, map1[i]);
+ if (map1[i] >= max_low_pfn)
+ continue;
+ reserve_bootmem(map1[i] << PAGE_SHIFT, PAGE_SIZE);
+ map2 = pfn_to_kaddr(map1[i]);
+ for (j = 0 ; (j < DUMP_MAP_SZ) && map2[j] &&
+ (off + j < last); j++) {
+ pr_debug("\t map[%d][%d] = 0x%lx\n", i, j,
+ map2[j]);
+ if (map2[j] < max_low_pfn) {
+ reserve_bootmem(map2[j] << PAGE_SHIFT,
+ PAGE_SIZE);
+ }
+ }
+ }
+ map1 = next_indirect_map(map1);
+ }
+ dev->nr_free = 0; /* these pages don't belong to this boot */
+}
+#endif
+
+/* mark dump pages so that they aren't used by this kernel */
+void dump_mark_map(struct dump_memdev *dev)
+{
+ unsigned long *map1, *map2;
+ loff_t off = 0, last = dev->last_used_offset >> PAGE_SHIFT;
+ struct page *page;
+ int i, j;
+
+ printk("Dump: marking pages in use by previous dump\n");
+ map1= (unsigned long *)dev->indirect_map_root;
+
+ while (map1 && (off < last)) {
+ page = virt_to_page(map1);
+ set_page_count(page, 1);
+ for (i=0; (i < DUMP_MAP_SZ - 1) && map1[i] && (off < last);
+ i++, off += DUMP_MAP_SZ) {
+ pr_debug("indirect map[%d] = 0x%lx\n", i, map1[i]);
+ page = pfn_to_page(map1[i]);
+ set_page_count(page, 1);
+ map2 = kmap_atomic(page, KM_DUMP);
+ for (j = 0 ; (j < DUMP_MAP_SZ) && map2[j] &&
+ (off + j < last); j++) {
+ pr_debug("\t map[%d][%d] = 0x%lx\n", i, j,
+ map2[j]);
+ page = pfn_to_page(map2[j]);
+ set_page_count(page, 1);
+ }
+ }
+ map1 = next_indirect_map(map1);
+ }
+}
+
+
+/*
+ * Given a logical offset into the mem device lookup the
+ * corresponding page
+ * loc is specified in units of pages
+ * Note: affects curr_map (even in the case where lookup fails)
+ */
+struct page *dump_mem_lookup(struct dump_memdev *dump_mdev, unsigned long loc)
+{
+ unsigned long *map;
+ unsigned long i, index = loc / DUMP_MAP_SZ;
+ struct page *page = NULL;
+ unsigned long curr_pfn, curr_map, *curr_map_ptr = NULL;
+
+ map = (unsigned long *)dump_mdev->indirect_map_root;
+ if (!map)
+ return NULL;
+
+ if (loc > dump_mdev->last_offset >> PAGE_SHIFT)
+ return NULL;
+
+ /*
+ * first locate the right indirect map
+ * in the chain of indirect maps
+ */
+ for (i = 0; i + DUMP_IND_MAP_SZ < index ; i += DUMP_IND_MAP_SZ) {
+ if (!(map = next_indirect_map(map)))
+ return NULL;
+ }
+ /* then the right direct map */
+ /* map entries are referred to by page index */
+ if ((curr_map = map[index - i])) {
+ page = pfn_to_page(curr_map);
+ /* update the current traversal index */
+ /* dump_mdev->curr_map = &map[index - i];*/
+ curr_map_ptr = &map[index - i];
+ }
+
+ if (page)
+ map = kmap_atomic(page, KM_DUMP);
+ else
+ return NULL;
+
+ /* and finally the right entry therein */
+ /* data pages are referred to by page index */
+ i = index * DUMP_MAP_SZ;
+ if ((curr_pfn = map[loc - i])) {
+ page = pfn_to_page(curr_pfn);
+ dump_mdev->curr_map = curr_map_ptr;
+ dump_mdev->curr_map_offset = loc - i;
+ dump_mdev->ddev.curr_offset = loc << PAGE_SHIFT;
+ } else {
+ page = NULL;
+ }
+ kunmap_atomic(map, KM_DUMP);
+
+ return page;
+}
+
+/*
+ * Retrieves a pointer to the next page in the dump device
+ * Used during the lookup pass post-soft-reboot
+ */
+struct page *dump_mem_next_page(struct dump_memdev *dev)
+{
+ unsigned long i;
+ unsigned long *map;
+ struct page *page = NULL;
+
+ if (dev->ddev.curr_offset + PAGE_SIZE >= dev->last_offset) {
+ return NULL;
+ }
+
+ if ((i = (unsigned long)(++dev->curr_map_offset)) >= DUMP_MAP_SZ) {
+ /* move to next map */
+ if (is_last_map_entry(++dev->curr_map)) {
+ /* move to the next indirect map page */
+ printk("dump_mem_next_page: go to next indirect map\n");
+ dev->curr_map = (unsigned long *)*dev->curr_map;
+ if (!dev->curr_map)
+ return NULL;
+ }
+ i = dev->curr_map_offset = 0;
+ pr_debug("dump_mem_next_page: next map 0x%lx, entry 0x%lx\n",
+ dev->curr_map, *dev->curr_map);
+
+ };
+
+ if (*dev->curr_map) {
+ map = kmap_atomic(pfn_to_page(*dev->curr_map), KM_DUMP);
+ if (map[i])
+ page = pfn_to_page(map[i]);
+ kunmap_atomic(map, KM_DUMP);
+ dev->ddev.curr_offset += PAGE_SIZE;
+ };
+
+ return page;
+}
+
+/* Copied from dump_filters.c */
+static inline int kernel_page(struct page *p)
+{
+ /* FIXME: Need to exclude hugetlb pages. Clue: reserved but inuse */
+ return (PageReserved(p) && !PageInuse(p)) || (!PageLRU(p) && PageInuse(p));
+}
+
+static inline int user_page(struct page *p)
+{
+ return PageInuse(p) && (!PageReserved(p) && PageLRU(p));
+}
+
+int dump_reused_by_boot(struct page *page)
+{
+ /* Todo
+ * Checks:
+ * if PageReserved
+ * if < __end + bootmem_bootmap_pages for this boot + allowance
+ * if overwritten by initrd (how to check ?)
+ * Also, add more checks in early boot code
+ * e.g. bootmem bootmap alloc verify not overwriting dump, and if
+ * so then realloc or move the dump pages out accordingly.
+ */
+
+ /* Temporary proof of concept hack, avoid overwriting kern pages */
+
+ return (kernel_page(page) || dump_low_page(page) || user_page(page));
+}
+
+
+/* Uses the free page passed in to expand available space */
+int dump_mem_add_space(struct dump_memdev *dev, struct page *page)
+{
+ struct page *map_page;
+ unsigned long *map;
+ unsigned long i;
+
+ if (!dev->curr_map)
+ return -ENOMEM; /* must've exhausted indirect map */
+
+ if (!*dev->curr_map || dev->curr_map_offset >= DUMP_MAP_SZ) {
+ /* add map space */
+ *dev->curr_map = page_to_pfn(page);
+ dev->curr_map_offset = 0;
+ return 0;
+ }
+
+ /* add data space */
+ i = dev->curr_map_offset;
+ map_page = pfn_to_page(*dev->curr_map);
+ map = (unsigned long *)kmap_atomic(map_page, KM_DUMP);
+ map[i] = page_to_pfn(page);
+ kunmap_atomic(map, KM_DUMP);
+ dev->curr_map_offset = ++i;
+ dev->last_offset += PAGE_SIZE;
+ if (i >= DUMP_MAP_SZ) {
+ /* move to next map */
+ if (is_last_map_entry(++dev->curr_map)) {
+ /* move to the next indirect map page */
+ pr_debug("dump_mem_add_space: using next"
+ "indirect map\n");
+ dev->curr_map = (unsigned long *)*dev->curr_map;
+ }
+ }
+ return 0;
+}
+
+
+/* Caution: making a dest page invalidates existing contents of the page */
+int dump_check_and_free_page(struct dump_memdev *dev, struct page *page)
+{
+ int err = 0;
+
+ /*
+ * the page can be used as a destination only if we are sure
+ * it won't get overwritten by the soft-boot, and is not
+ * critical for us right now.
+ */
+ if (dump_reused_by_boot(page))
+ return 0;
+
+ if ((err = dump_mem_add_space(dev, page))) {
+ printk("Warning: Unable to extend memdev space. Err %d\n",
+ err);
+ return 0;
+ }
+
+ dev->nr_free++;
+ return 1;
+}
+
+
+/* Set up the initial maps and bootstrap space */
+/* Must be called only after any previous dump is written out */
+int dump_mem_open(struct dump_dev *dev, unsigned long devid)
+{
+ struct dump_memdev *dump_mdev = DUMP_MDEV(dev);
+ unsigned long nr_maps, *map, *prev_map = &dump_mdev->indirect_map_root;
+ void *addr;
+ struct page *page;
+ unsigned long i = 0;
+ int err = 0;
+
+ /* Todo: sanity check for unwritten previous dump */
+
+ /* allocate pages for indirect map (non highmem area) */
+ nr_maps = num_physpages / DUMP_MAP_SZ; /* maps to cover entire mem */
+ for (i = 0; i < nr_maps; i += DUMP_IND_MAP_SZ) {
+ if (!(map = (unsigned long *)dump_alloc_mem(PAGE_SIZE))) {
+ printk("Unable to alloc indirect map %ld\n",
+ i / DUMP_IND_MAP_SZ);
+ return -ENOMEM;
+ }
+ clear_page(map);
+ *prev_map = (unsigned long)map;
+ prev_map = &map[DUMP_IND_MAP_SZ];
+ };
+
+ dump_mdev->curr_map = (unsigned long *)dump_mdev->indirect_map_root;
+ dump_mdev->curr_map_offset = 0;
+
+ /*
+ * allocate a few bootstrap pages: at least 1 map and 1 data page
+ * plus enough to save the dump header
+ */
+ i = 0;
+ do {
+ if (!(addr = dump_alloc_mem(PAGE_SIZE))) {
+ printk("Unable to alloc bootstrap page %ld\n", i);
+ return -ENOMEM;
+ }
+
+ page = virt_to_page(addr);
+ if (dump_low_page(page)) {
+ dump_free_mem(addr);
+ continue;
+ }
+
+ if (dump_mem_add_space(dump_mdev, page)) {
+ printk("Warning: Unable to extend memdev "
+ "space. Err %d\n", err);
+ dump_free_mem(addr);
+ continue;
+ }
+ i++;
+ } while (i < DUMP_NR_BOOTSTRAP);
+
+ printk("dump memdev init: %ld maps, %ld bootstrap pgs, %ld free pgs\n",
+ nr_maps, i, dump_mdev->last_offset >> PAGE_SHIFT);
+
+ dump_mdev->last_bs_offset = dump_mdev->last_offset;
+
+ return 0;
+}
+
+/* Releases all pre-alloc'd pages */
+int dump_mem_release(struct dump_dev *dev)
+{
+ struct dump_memdev *dump_mdev = DUMP_MDEV(dev);
+ struct page *page, *map_page;
+ unsigned long *map, *prev_map;
+ void *addr;
+ int i;
+
+ if (!dump_mdev->nr_free)
+ return 0;
+
+ pr_debug("dump_mem_release\n");
+ page = dump_mem_lookup(dump_mdev, 0);
+ for (i = 0; page && (i < DUMP_NR_BOOTSTRAP - 1); i++) {
+ if (PageHighMem(page))
+ break;
+ addr = page_address(page);
+ if (!addr) {
+ printk("page_address(%p) = NULL\n", page);
+ break;
+ }
+ pr_debug("Freeing page at 0x%lx\n", addr);
+ dump_free_mem(addr);
+ if (dump_mdev->curr_map_offset >= DUMP_MAP_SZ - 1) {
+ map_page = pfn_to_page(*dump_mdev->curr_map);
+ if (PageHighMem(map_page))
+ break;
+ page = dump_mem_next_page(dump_mdev);
+ addr = page_address(map_page);
+ if (!addr) {
+ printk("page_address(%p) = NULL\n",
+ map_page);
+ break;
+ }
+ pr_debug("Freeing map page at 0x%lx\n", addr);
+ dump_free_mem(addr);
+ i++;
+ } else {
+ page = dump_mem_next_page(dump_mdev);
+ }
+ }
+
+ /* now for the last used bootstrap page used as a map page */
+ if ((i < DUMP_NR_BOOTSTRAP) && (*dump_mdev->curr_map)) {
+ map_page = pfn_to_page(*dump_mdev->curr_map);
+ if ((map_page) && !PageHighMem(map_page)) {
+ addr = page_address(map_page);
+ if (!addr) {
+ printk("page_address(%p) = NULL\n", map_page);
+ } else {
+ pr_debug("Freeing map page at 0x%lx\n", addr);
+ dump_free_mem(addr);
+ i++;
+ }
+ }
+ }
+
+ printk("Freed %d bootstrap pages\n", i);
+
+ /* free the indirect maps */
+ map = (unsigned long *)dump_mdev->indirect_map_root;
+
+ i = 0;
+ while (map) {
+ prev_map = map;
+ map = next_indirect_map(map);
+ dump_free_mem(prev_map);
+ i++;
+ }
+
+ printk("Freed %d indirect map(s)\n", i);
+
+ /* Reset the indirect map */
+ dump_mdev->indirect_map_root = 0;
+ dump_mdev->curr_map = 0;
+
+ /* Reset the free list */
+ dump_mdev->nr_free = 0;
+
+ dump_mdev->last_offset = dump_mdev->ddev.curr_offset = 0;
+ dump_mdev->last_used_offset = 0;
+ dump_mdev->curr_map = NULL;
+ dump_mdev->curr_map_offset = 0;
+ return 0;
+}
+
+/*
+ * Long term:
+ * It is critical for this to be very strict. Cannot afford
+ * to have anything running and accessing memory while we overwrite
+ * memory (potential risk of data corruption).
+ * If in doubt (e.g if a cpu is hung and not responding) just give
+ * up and refuse to proceed with this scheme.
+ *
+ * Note: I/O will only happen after soft-boot/switchover, so we can
+ * safely disable interrupts and force stop other CPUs if this is
+ * going to be a disruptive dump, no matter what they
+ * are in the middle of.
+ */
+/*
+ * ATM Most of this is already taken care of in the nmi handler
+ * We may halt the cpus rightaway if we know this is going to be disruptive
+ * For now, since we've limited ourselves to overwriting free pages we
+ * aren't doing much here. Eventually, we'd have to wait to make sure other
+ * cpus aren't using memory we could be overwriting
+ */
+int dump_mem_silence(struct dump_dev *dev)
+{
+ struct dump_memdev *dump_mdev = DUMP_MDEV(dev);
+
+ if (dump_mdev->last_offset > dump_mdev->last_bs_offset) {
+ /* prefer to run lkcd config & start with a clean slate */
+ return -EEXIST;
+ }
+ return 0;
+}
+
+extern int dump_overlay_resume(void);
+
+/* Trigger the next stage of dumping */
+int dump_mem_resume(struct dump_dev *dev)
+{
+ dump_overlay_resume();
+ return 0;
+}
+
+/*
+ * Allocate mem dev pages as required and copy buffer contents into it.
+ * Fails if the no free pages are available
+ * Keeping it simple and limited for starters (can modify this over time)
+ * Does not handle holes or a sparse layout
+ * Data must be in multiples of PAGE_SIZE
+ */
+int dump_mem_write(struct dump_dev *dev, void *buf, unsigned long len)
+{
+ struct dump_memdev *dump_mdev = DUMP_MDEV(dev);
+ struct page *page;
+ unsigned long n = 0;
+ void *addr;
+ unsigned long *saved_curr_map, saved_map_offset;
+ int ret = 0;
+
+ pr_debug("dump_mem_write: offset 0x%llx, size %ld\n",
+ dev->curr_offset, len);
+
+ if (dev->curr_offset + len > dump_mdev->last_offset) {
+ printk("Out of space to write\n");
+ return -ENOSPC;
+ }
+
+ if ((len & (PAGE_SIZE - 1)) || (dev->curr_offset & (PAGE_SIZE - 1)))
+ return -EINVAL; /* not aligned in units of page size */
+
+ saved_curr_map = dump_mdev->curr_map;
+ saved_map_offset = dump_mdev->curr_map_offset;
+ page = dump_mem_lookup(dump_mdev, dev->curr_offset >> PAGE_SHIFT);
+
+ for (n = len; (n > 0) && page; n -= PAGE_SIZE, buf += PAGE_SIZE ) {
+ addr = kmap_atomic(page, KM_DUMP);
+ /* memset(addr, 'x', PAGE_SIZE); */
+ memcpy(addr, buf, PAGE_SIZE);
+ kunmap_atomic(addr, KM_DUMP);
+ /* dev->curr_offset += PAGE_SIZE; */
+ page = dump_mem_next_page(dump_mdev);
+ }
+
+ dump_mdev->curr_map = saved_curr_map;
+ dump_mdev->curr_map_offset = saved_map_offset;
+
+ if (dump_mdev->last_used_offset < dev->curr_offset)
+ dump_mdev->last_used_offset = dev->curr_offset;
+
+ return (len - n) ? (len - n) : ret ;
+}
+
+/* dummy - always ready */
+int dump_mem_ready(struct dump_dev *dev, void *buf)
+{
+ return 0;
+}
+
+/*
+ * Should check for availability of space to write upto the offset
+ * affects only the curr_offset; last_offset untouched
+ * Keep it simple: Only allow multiples of PAGE_SIZE for now
+ */
+int dump_mem_seek(struct dump_dev *dev, loff_t offset)
+{
+ struct dump_memdev *dump_mdev = DUMP_MDEV(dev);
+
+ if (offset & (PAGE_SIZE - 1))
+ return -EINVAL; /* allow page size units only for now */
+
+ /* Are we exceeding available space ? */
+ if (offset > dump_mdev->last_offset) {
+ printk("dump_mem_seek failed for offset 0x%llx\n",
+ offset);
+ return -ENOSPC;
+ }
+
+ dump_mdev->ddev.curr_offset = offset;
+ return 0;
+}
+
+struct dump_dev_ops dump_memdev_ops = {
+ .open = dump_mem_open,
+ .release = dump_mem_release,
+ .silence = dump_mem_silence,
+ .resume = dump_mem_resume,
+ .seek = dump_mem_seek,
+ .write = dump_mem_write,
+ .read = NULL, /* not implemented at the moment */
+ .ready = dump_mem_ready
+};
+
+static struct dump_memdev default_dump_memdev = {
+ .ddev = {.type_name = "memdev", .ops = &dump_memdev_ops,
+ .device_id = 0x14}
+ /* assume the rest of the fields are zeroed by default */
+};
+
+/* may be overwritten if a previous dump exists */
+struct dump_memdev *dump_memdev = &default_dump_memdev;
+
--- /dev/null
+/*
+ * Generic interfaces for flexible system dump
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya (suparna@in.ibm.com)
+ *
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+#ifndef _LINUX_DUMP_METHODS_H
+#define _LINUX_DUMP_METHODS_H
+
+/*
+ * Inspired by Matt Robinson's suggestion of introducing dump
+ * methods as a way to enable different crash dump facilities to
+ * coexist where each employs its own scheme or dumping policy.
+ *
+ * The code here creates a framework for flexible dump by defining
+ * a set of methods and providing associated helpers that differentiate
+ * between the underlying mechanism (how to dump), overall scheme
+ * (sequencing of stages and data dumped and associated quiescing),
+ * output format (what the dump output looks like), target type
+ * (where to save the dump; see dumpdev.h), and selection policy
+ * (state/data to dump).
+ *
+ * These sets of interfaces can be mixed and matched to build a
+ * dumper suitable for a given situation, allowing for
+ * flexibility as well appropriate degree of code reuse.
+ * For example all features and options of lkcd (including
+ * granular selective dumping in the near future) should be
+ * available even when say, the 2 stage soft-boot based mechanism
+ * is used for taking disruptive dumps.
+ *
+ * Todo: Additionally modules or drivers may supply their own
+ * custom dumpers which extend dump with module specific
+ * information or hardware state, and can even tweak the
+ * mechanism when it comes to saving state relevant to
+ * them.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+#include <linux/dumpdev.h>
+
+#define MAX_PASSES 6
+#define MAX_DEVS 4
+
+
+/* To customise selection of pages to be dumped in a given pass/group */
+struct dump_data_filter{
+ char name[32];
+ int (*selector)(int, unsigned long, unsigned long);
+ ulong level_mask; /* dump level(s) for which this filter applies */
+ loff_t start[MAX_NUMNODES], end[MAX_NUMNODES]; /* location range applicable */
+ ulong num_mbanks; /* Number of memory banks. Greater than one for discontig memory (NUMA) */
+};
+
+
+/*
+ * Determined by the kind of dump mechanism and appropriate
+ * overall scheme
+ */
+struct dump_scheme_ops {
+ /* sets aside memory, inits data structures etc */
+ int (*configure)(unsigned long devid);
+ /* releases resources */
+ int (*unconfigure)(void);
+
+ /* ordering of passes, invoking iterator */
+ int (*sequencer)(void);
+ /* iterates over system data, selects and acts on data to dump */
+ int (*iterator)(int, int (*)(unsigned long, unsigned long),
+ struct dump_data_filter *);
+ /* action when data is selected for dump */
+ int (*save_data)(unsigned long, unsigned long);
+ /* action when data is to be excluded from dump */
+ int (*skip_data)(unsigned long, unsigned long);
+ /* policies for space, multiple dump devices etc */
+ int (*write_buffer)(void *, unsigned long);
+};
+
+struct dump_scheme {
+ /* the name serves as an anchor to locate the scheme after reboot */
+ char name[32];
+ struct dump_scheme_ops *ops;
+ struct list_head list;
+};
+
+/* Quiescing/Silence levels (controls IPI callback behaviour) */
+extern enum dump_silence_levels {
+ DUMP_SOFT_SPIN_CPUS = 1,
+ DUMP_HARD_SPIN_CPUS = 2,
+ DUMP_HALT_CPUS = 3,
+} dump_silence_level;
+
+/* determined by the dump (file) format */
+struct dump_fmt_ops {
+ /* build header */
+ int (*configure_header)(const char *, const struct pt_regs *);
+ int (*update_header)(void); /* update header and write it out */
+ /* save curr context */
+ void (*save_context)(int, const struct pt_regs *,
+ struct task_struct *);
+ /* typically called by the save_data action */
+ /* add formatted data to the dump buffer */
+ int (*add_data)(unsigned long, unsigned long);
+ int (*update_end_marker)(void);
+};
+
+struct dump_fmt {
+ unsigned long magic;
+ char name[32]; /* lcrash, crash, elf-core etc */
+ struct dump_fmt_ops *ops;
+ struct list_head list;
+};
+
+/*
+ * Modules will be able add their own data capture schemes by
+ * registering their own dumpers. Typically they would use the
+ * primary dumper as a template and tune it with their routines.
+ * Still Todo.
+ */
+
+/* The combined dumper profile (mechanism, scheme, dev, fmt) */
+struct dumper {
+ char name[32]; /* singlestage, overlay (stg1), passthru(stg2), pull */
+ struct dump_scheme *scheme;
+ struct dump_fmt *fmt;
+ struct __dump_compress *compress;
+ struct dump_data_filter *filter;
+ struct dump_dev *dev;
+ /* state valid only for active dumper(s) - per instance */
+ /* run time state/context */
+ int curr_pass;
+ unsigned long count;
+ loff_t curr_offset; /* current logical offset into dump device */
+ loff_t curr_loc; /* current memory location */
+ void *curr_buf; /* current position in the dump buffer */
+ void *dump_buf; /* starting addr of dump buffer */
+ int header_dirty; /* whether the header needs to be written out */
+ int header_len;
+ struct list_head dumper_list; /* links to other dumpers */
+};
+
+/* Starting point to get to the current configured state */
+struct dump_config {
+ ulong level;
+ ulong flags;
+ struct dumper *dumper;
+ unsigned long dump_device;
+ unsigned long dump_addr; /* relevant only for in-memory dumps */
+ struct list_head dump_dev_list;
+};
+
+extern struct dump_config dump_config;
+
+/* Used to save the dump config across a reboot for 2-stage dumps:
+ *
+ * Note: The scheme, format, compression and device type should be
+ * registered at bootup, for this config to be sharable across soft-boot.
+ * The function addresses could have changed and become invalid, and
+ * need to be set up again.
+ */
+struct dump_config_block {
+ u64 magic; /* for a quick sanity check after reboot */
+ struct dump_memdev memdev; /* handle to dump stored in memory */
+ struct dump_config config;
+ struct dumper dumper;
+ struct dump_scheme scheme;
+ struct dump_fmt fmt;
+ struct __dump_compress compress;
+ struct dump_data_filter filter_table[MAX_PASSES];
+ struct dump_anydev dev[MAX_DEVS]; /* target dump device */
+};
+
+
+/* Wrappers that invoke the methods for the current (active) dumper */
+
+/* Scheme operations */
+
+static inline int dump_sequencer(void)
+{
+ return dump_config.dumper->scheme->ops->sequencer();
+}
+
+static inline int dump_iterator(int pass, int (*action)(unsigned long,
+ unsigned long), struct dump_data_filter *filter)
+{
+ return dump_config.dumper->scheme->ops->iterator(pass, action, filter);
+}
+
+#define dump_save_data dump_config.dumper->scheme->ops->save_data
+#define dump_skip_data dump_config.dumper->scheme->ops->skip_data
+
+static inline int dump_write_buffer(void *buf, unsigned long len)
+{
+ return dump_config.dumper->scheme->ops->write_buffer(buf, len);
+}
+
+static inline int dump_configure(unsigned long devid)
+{
+ return dump_config.dumper->scheme->ops->configure(devid);
+}
+
+static inline int dump_unconfigure(void)
+{
+ return dump_config.dumper->scheme->ops->unconfigure();
+}
+
+/* Format operations */
+
+static inline int dump_configure_header(const char *panic_str,
+ const struct pt_regs *regs)
+{
+ return dump_config.dumper->fmt->ops->configure_header(panic_str, regs);
+}
+
+static inline void dump_save_context(int cpu, const struct pt_regs *regs,
+ struct task_struct *tsk)
+{
+ dump_config.dumper->fmt->ops->save_context(cpu, regs, tsk);
+}
+
+static inline int dump_save_this_cpu(const struct pt_regs *regs)
+{
+ int cpu = smp_processor_id();
+
+ dump_save_context(cpu, regs, current);
+ return 1;
+}
+
+static inline int dump_update_header(void)
+{
+ return dump_config.dumper->fmt->ops->update_header();
+}
+
+static inline int dump_update_end_marker(void)
+{
+ return dump_config.dumper->fmt->ops->update_end_marker();
+}
+
+static inline int dump_add_data(unsigned long loc, unsigned long sz)
+{
+ return dump_config.dumper->fmt->ops->add_data(loc, sz);
+}
+
+/* Compression operation */
+static inline int dump_compress_data(char *src, int slen, char *dst)
+{
+ return dump_config.dumper->compress->compress_func(src, slen,
+ dst, DUMP_DPC_PAGE_SIZE);
+}
+
+
+/* Prototypes of some default implementations of dump methods */
+
+extern struct __dump_compress dump_none_compression;
+
+/* Default scheme methods (dump_scheme.c) */
+
+extern int dump_generic_sequencer(void);
+extern int dump_page_iterator(int pass, int (*action)(unsigned long, unsigned
+ long), struct dump_data_filter *filter);
+extern int dump_generic_save_data(unsigned long loc, unsigned long sz);
+extern int dump_generic_skip_data(unsigned long loc, unsigned long sz);
+extern int dump_generic_write_buffer(void *buf, unsigned long len);
+extern int dump_generic_configure(unsigned long);
+extern int dump_generic_unconfigure(void);
+
+/* Default scheme template */
+extern struct dump_scheme dump_scheme_singlestage;
+
+/* Default dump format methods */
+
+extern int dump_lcrash_configure_header(const char *panic_str,
+ const struct pt_regs *regs);
+extern void dump_lcrash_save_context(int cpu, const struct pt_regs *regs,
+ struct task_struct *tsk);
+extern int dump_generic_update_header(void);
+extern int dump_lcrash_add_data(unsigned long loc, unsigned long sz);
+extern int dump_lcrash_update_end_marker(void);
+
+/* Default format (lcrash) template */
+extern struct dump_fmt dump_fmt_lcrash;
+
+/* Default dump selection filter table */
+
+/*
+ * Entries listed in order of importance and correspond to passes
+ * The last entry (with a level_mask of zero) typically reflects data that
+ * won't be dumped -- this may for example be used to identify data
+ * that will be skipped for certain so the corresponding memory areas can be
+ * utilized as scratch space.
+ */
+extern struct dump_data_filter dump_filter_table[];
+
+/* Some pre-defined dumpers */
+extern struct dumper dumper_singlestage;
+extern struct dumper dumper_stage1;
+extern struct dumper dumper_stage2;
+
+/* These are temporary */
+#define DUMP_MASK_HEADER DUMP_LEVEL_HEADER
+#define DUMP_MASK_KERN DUMP_LEVEL_KERN
+#define DUMP_MASK_USED DUMP_LEVEL_USED
+#define DUMP_MASK_UNUSED DUMP_LEVEL_ALL_RAM
+#define DUMP_MASK_REST 0 /* dummy for now */
+
+/* Helpers - move these to dump.h later ? */
+
+int dump_generic_execute(const char *panic_str, const struct pt_regs *regs);
+extern int dump_ll_write(void *buf, unsigned long len);
+int dump_check_and_free_page(struct dump_memdev *dev, struct page *page);
+
+static inline void dumper_reset(void)
+{
+ dump_config.dumper->curr_buf = dump_config.dumper->dump_buf;
+ dump_config.dumper->curr_loc = 0;
+ dump_config.dumper->curr_offset = 0;
+ dump_config.dumper->count = 0;
+ dump_config.dumper->curr_pass = 0;
+}
+
+/*
+ * May later be moulded to perform boot-time allocations so we can dump
+ * earlier during bootup
+ */
+static inline void *dump_alloc_mem(unsigned long size)
+{
+ return kmalloc(size, GFP_KERNEL);
+}
+
+static inline void dump_free_mem(void *buf)
+{
+ struct page *page;
+
+ /* ignore reserved pages (e.g. post soft boot stage) */
+ if (buf && (page = virt_to_page(buf))) {
+ if (PageReserved(page))
+ return;
+ }
+
+ kfree(buf);
+}
+
+
+#endif /* _LINUX_DUMP_METHODS_H */
--- /dev/null
+/*
+ * Implements the dump driver interface for saving a dump via network
+ * interface.
+ *
+ * Some of this code has been taken/adapted from Ingo Molnar's netconsole
+ * code. LKCD team expresses its thanks to Ingo.
+ *
+ * Started: June 2002 - Mohamed Abbas <mohamed.abbas@intel.com>
+ * Adapted netconsole code to implement LKCD dump over the network.
+ *
+ * Nov 2002 - Bharata B. Rao <bharata@in.ibm.com>
+ * Innumerable code cleanups, simplification and some fixes.
+ * Netdump configuration done by ioctl instead of using module parameters.
+ *
+ * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <linux/delay.h>
+#include <linux/random.h>
+#include <linux/reboot.h>
+#include <linux/module.h>
+#include <linux/dump.h>
+#include <linux/dump_netdev.h>
+#include <linux/percpu.h>
+
+#include <asm/unaligned.h>
+
+static int startup_handshake;
+static int page_counter;
+static struct net_device *dump_ndev;
+static struct in_device *dump_in_dev;
+static u16 source_port, target_port;
+static u32 source_ip, target_ip;
+static unsigned char daddr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff} ;
+static spinlock_t dump_skb_lock = SPIN_LOCK_UNLOCKED;
+static int dump_nr_skbs;
+static struct sk_buff *dump_skb;
+static unsigned long flags_global;
+static int netdump_in_progress;
+static char device_name[IFNAMSIZ];
+
+/*
+ * security depends on the trusted path between the netconsole
+ * server and netconsole client, since none of the packets are
+ * encrypted. The random magic number protects the protocol
+ * against spoofing.
+ */
+static u64 dump_magic;
+
+#define MAX_UDP_CHUNK 1460
+#define MAX_PRINT_CHUNK (MAX_UDP_CHUNK-HEADER_LEN)
+
+/*
+ * We maintain a small pool of fully-sized skbs,
+ * to make sure the message gets out even in
+ * extreme OOM situations.
+ */
+#define DUMP_MAX_SKBS 32
+
+#define MAX_SKB_SIZE \
+ (MAX_UDP_CHUNK + sizeof(struct udphdr) + \
+ sizeof(struct iphdr) + sizeof(struct ethhdr))
+
+static void
+dump_refill_skbs(void)
+{
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dump_skb_lock, flags);
+ while (dump_nr_skbs < DUMP_MAX_SKBS) {
+ skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
+ if (!skb)
+ break;
+ if (dump_skb)
+ skb->next = dump_skb;
+ else
+ skb->next = NULL;
+ dump_skb = skb;
+ dump_nr_skbs++;
+ }
+ spin_unlock_irqrestore(&dump_skb_lock, flags);
+}
+
+static struct
+sk_buff * dump_get_skb(void)
+{
+ struct sk_buff *skb;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dump_skb_lock, flags);
+ skb = dump_skb;
+ if (skb) {
+ dump_skb = skb->next;
+ skb->next = NULL;
+ dump_nr_skbs--;
+ }
+ spin_unlock_irqrestore(&dump_skb_lock, flags);
+
+ return skb;
+}
+
+/*
+ * Zap completed output skbs.
+ */
+static void
+zap_completion_queue(void)
+{
+ int count;
+ unsigned long flags;
+ struct softnet_data *sd;
+
+ count=0;
+ sd = &__get_cpu_var(softnet_data);
+ if (sd->completion_queue) {
+ struct sk_buff *clist;
+
+ local_irq_save(flags);
+ clist = sd->completion_queue;
+ sd->completion_queue = NULL;
+ local_irq_restore(flags);
+
+ while (clist != NULL) {
+ struct sk_buff *skb = clist;
+ clist = clist->next;
+ __kfree_skb(skb);
+ count++;
+ if (count > 10000)
+ printk("Error in sk list\n");
+ }
+ }
+}
+
+static void
+dump_send_skb(struct net_device *dev, const char *msg, unsigned int msg_len,
+ reply_t *reply)
+{
+ int once = 1;
+ int total_len, eth_len, ip_len, udp_len, count = 0;
+ struct sk_buff *skb;
+ struct udphdr *udph;
+ struct iphdr *iph;
+ struct ethhdr *eth;
+
+ udp_len = msg_len + HEADER_LEN + sizeof(*udph);
+ ip_len = eth_len = udp_len + sizeof(*iph);
+ total_len = eth_len + ETH_HLEN;
+
+repeat_loop:
+ zap_completion_queue();
+ if (dump_nr_skbs < DUMP_MAX_SKBS)
+ dump_refill_skbs();
+
+ skb = alloc_skb(total_len, GFP_ATOMIC);
+ if (!skb) {
+ skb = dump_get_skb();
+ if (!skb) {
+ count++;
+ if (once && (count == 1000000)) {
+ printk("possibly FATAL: out of netconsole "
+ "skbs!!! will keep retrying.\n");
+ once = 0;
+ }
+ dev->poll_controller(dev);
+ goto repeat_loop;
+ }
+ }
+
+ atomic_set(&skb->users, 1);
+ skb_reserve(skb, total_len - msg_len - HEADER_LEN);
+ skb->data[0] = NETCONSOLE_VERSION;
+
+ put_unaligned(htonl(reply->nr), (u32 *) (skb->data + 1));
+ put_unaligned(htonl(reply->code), (u32 *) (skb->data + 5));
+ put_unaligned(htonl(reply->info), (u32 *) (skb->data + 9));
+
+ memcpy(skb->data + HEADER_LEN, msg, msg_len);
+ skb->len += msg_len + HEADER_LEN;
+
+ udph = (struct udphdr *) skb_push(skb, sizeof(*udph));
+ udph->source = source_port;
+ udph->dest = target_port;
+ udph->len = htons(udp_len);
+ udph->check = 0;
+
+ iph = (struct iphdr *)skb_push(skb, sizeof(*iph));
+
+ iph->version = 4;
+ iph->ihl = 5;
+ iph->tos = 0;
+ iph->tot_len = htons(ip_len);
+ iph->id = 0;
+ iph->frag_off = 0;
+ iph->ttl = 64;
+ iph->protocol = IPPROTO_UDP;
+ iph->check = 0;
+ iph->saddr = source_ip;
+ iph->daddr = target_ip;
+ iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
+
+ eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
+
+ eth->h_proto = htons(ETH_P_IP);
+ memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
+ memcpy(eth->h_dest, daddr, dev->addr_len);
+
+ count=0;
+repeat_poll:
+ spin_lock(&dev->xmit_lock);
+ dev->xmit_lock_owner = smp_processor_id();
+
+ count++;
+
+
+ if (netif_queue_stopped(dev)) {
+ dev->xmit_lock_owner = -1;
+ spin_unlock(&dev->xmit_lock);
+
+ dev->poll_controller(dev);
+ zap_completion_queue();
+
+
+ goto repeat_poll;
+ }
+
+ dev->hard_start_xmit(skb, dev);
+
+ dev->xmit_lock_owner = -1;
+ spin_unlock(&dev->xmit_lock);
+}
+
+static unsigned short
+udp_check(struct udphdr *uh, int len, unsigned long saddr, unsigned long daddr,
+ unsigned long base)
+{
+ return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base);
+}
+
+static int
+udp_checksum_init(struct sk_buff *skb, struct udphdr *uh,
+ unsigned short ulen, u32 saddr, u32 daddr)
+{
+ if (uh->check == 0) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else if (skb->ip_summed == CHECKSUM_HW) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ if (!udp_check(uh, ulen, saddr, daddr, skb->csum))
+ return 0;
+ skb->ip_summed = CHECKSUM_NONE;
+ }
+ if (skb->ip_summed != CHECKSUM_UNNECESSARY)
+ skb->csum = csum_tcpudp_nofold(saddr, daddr, ulen,
+ IPPROTO_UDP, 0);
+ /* Probably, we should checksum udp header (it should be in cache
+ * in any case) and data in tiny packets (< rx copybreak).
+ */
+ return 0;
+}
+
+static __inline__ int
+__udp_checksum_complete(struct sk_buff *skb)
+{
+ return (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len,
+ skb->csum));
+}
+
+static __inline__
+int udp_checksum_complete(struct sk_buff *skb)
+{
+ return skb->ip_summed != CHECKSUM_UNNECESSARY &&
+ __udp_checksum_complete(skb);
+}
+
+int new_req = 0;
+static req_t req;
+
+static int
+dump_rx_hook(struct sk_buff *skb)
+{
+ int proto;
+ struct iphdr *iph;
+ struct udphdr *uh;
+ __u32 len, saddr, daddr, ulen;
+ req_t *__req;
+
+ /*
+ * First check if were are dumping or doing startup handshake, if
+ * not quickly return.
+ */
+ if (!netdump_in_progress)
+ return NET_RX_SUCCESS;
+
+ if (skb->dev->type != ARPHRD_ETHER)
+ goto out;
+
+ proto = ntohs(skb->mac.ethernet->h_proto);
+ if (proto != ETH_P_IP)
+ goto out;
+
+ if (skb->pkt_type == PACKET_OTHERHOST)
+ goto out;
+
+ if (skb_shared(skb))
+ goto out;
+
+ /* IP header correctness testing: */
+ iph = (struct iphdr *)skb->data;
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto out;
+
+ if (iph->ihl < 5 || iph->version != 4)
+ goto out;
+
+ if (!pskb_may_pull(skb, iph->ihl*4))
+ goto out;
+
+ if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
+ goto out;
+
+ len = ntohs(iph->tot_len);
+ if (skb->len < len || len < iph->ihl*4)
+ goto out;
+
+ saddr = iph->saddr;
+ daddr = iph->daddr;
+ if (iph->protocol != IPPROTO_UDP)
+ goto out;
+
+ if (source_ip != daddr)
+ goto out;
+
+ if (target_ip != saddr)
+ goto out;
+
+ len -= iph->ihl*4;
+ uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
+ ulen = ntohs(uh->len);
+
+ if (ulen != len || ulen < (sizeof(*uh) + sizeof(*__req)))
+ goto out;
+
+ if (udp_checksum_init(skb, uh, ulen, saddr, daddr) < 0)
+ goto out;
+
+ if (udp_checksum_complete(skb))
+ goto out;
+
+ if (source_port != uh->dest)
+ goto out;
+
+ if (target_port != uh->source)
+ goto out;
+
+ __req = (req_t *)(uh + 1);
+ if ((ntohl(__req->command) != COMM_GET_MAGIC) &&
+ (ntohl(__req->command) != COMM_HELLO) &&
+ (ntohl(__req->command) != COMM_START_WRITE_NETDUMP_ACK) &&
+ (ntohl(__req->command) != COMM_START_NETDUMP_ACK) &&
+ (memcmp(&__req->magic, &dump_magic, sizeof(dump_magic)) != 0))
+ goto out;
+
+ req.magic = ntohl(__req->magic);
+ req.command = ntohl(__req->command);
+ req.from = ntohl(__req->from);
+ req.to = ntohl(__req->to);
+ req.nr = ntohl(__req->nr);
+ new_req = 1;
+out:
+ return NET_RX_DROP;
+}
+
+static void
+dump_send_mem(struct net_device *dev, req_t *req, const char* buff, size_t len)
+{
+ int i;
+
+ int nr_chunks = len/1024;
+ reply_t reply;
+
+ reply.nr = req->nr;
+ reply.info = 0;
+
+ if ( nr_chunks <= 0)
+ nr_chunks = 1;
+ for (i = 0; i < nr_chunks; i++) {
+ unsigned int offset = i*1024;
+ reply.code = REPLY_MEM;
+ reply.info = offset;
+ dump_send_skb(dev, buff + offset, 1024, &reply);
+ }
+}
+
+/*
+ * This function waits for the client to acknowledge the receipt
+ * of the netdump startup reply, with the possibility of packets
+ * getting lost. We resend the startup packet if no ACK is received,
+ * after a 1 second delay.
+ *
+ * (The client can test the success of the handshake via the HELLO
+ * command, and send ACKs until we enter netdump mode.)
+ */
+static int
+dump_handshake(struct dump_dev *net_dev)
+{
+ char tmp[200];
+ reply_t reply;
+ int i, j;
+
+ if (startup_handshake) {
+ sprintf(tmp, "NETDUMP start, waiting for start-ACK.\n");
+ reply.code = REPLY_START_NETDUMP;
+ reply.nr = 0;
+ reply.info = 0;
+ } else {
+ sprintf(tmp, "NETDUMP start, waiting for start-ACK.\n");
+ reply.code = REPLY_START_WRITE_NETDUMP;
+ reply.nr = net_dev->curr_offset;
+ reply.info = net_dev->curr_offset;
+ }
+
+ /* send 300 handshake packets before declaring failure */
+ for (i = 0; i < 300; i++) {
+ dump_send_skb(dump_ndev, tmp, strlen(tmp), &reply);
+
+ /* wait 1 sec */
+ for (j = 0; j < 10000; j++) {
+ udelay(100);
+ dump_ndev->poll_controller(dump_ndev);
+ zap_completion_queue();
+ if (new_req)
+ break;
+ }
+
+ /*
+ * if there is no new request, try sending the handshaking
+ * packet again
+ */
+ if (!new_req)
+ continue;
+
+ /*
+ * check if the new request is of the expected type,
+ * if so, return, else try sending the handshaking
+ * packet again
+ */
+ if (startup_handshake) {
+ if (req.command == COMM_HELLO || req.command ==
+ COMM_START_NETDUMP_ACK) {
+ return 0;
+ } else {
+ new_req = 0;
+ continue;
+ }
+ } else {
+ if (req.command == COMM_SEND_MEM) {
+ return 0;
+ } else {
+ new_req = 0;
+ continue;
+ }
+ }
+ }
+ return -1;
+}
+
+static ssize_t
+do_netdump(struct dump_dev *net_dev, const char* buff, size_t len)
+{
+ reply_t reply;
+ char tmp[200];
+ ssize_t ret = 0;
+ int repeatCounter, counter, total_loop;
+
+ netdump_in_progress = 1;
+
+ if (dump_handshake(net_dev) < 0) {
+ printk("network dump failed due to handshake failure\n");
+ goto out;
+ }
+
+ /*
+ * Ideally startup handshake should be done during dump configuration,
+ * i.e., in dump_net_open(). This will be done when I figure out
+ * the dependency between startup handshake, subsequent write and
+ * various commands wrt to net-server.
+ */
+ if (startup_handshake)
+ startup_handshake = 0;
+
+ counter = 0;
+ repeatCounter = 0;
+ total_loop = 0;
+ while (1) {
+ if (!new_req) {
+ dump_ndev->poll_controller(dump_ndev);
+ zap_completion_queue();
+ }
+ if (!new_req) {
+ repeatCounter++;
+
+ if (repeatCounter > 5) {
+ counter++;
+ if (counter > 10000) {
+ if (total_loop >= 100000) {
+ printk("Time OUT LEAVE NOW\n");
+ goto out;
+ } else {
+ total_loop++;
+ printk("Try number %d out of "
+ "10 before Time Out\n",
+ total_loop);
+ }
+ }
+ mdelay(1);
+ repeatCounter = 0;
+ }
+ continue;
+ }
+ repeatCounter = 0;
+ counter = 0;
+ total_loop = 0;
+ new_req = 0;
+ switch (req.command) {
+ case COMM_NONE:
+ break;
+
+ case COMM_SEND_MEM:
+ dump_send_mem(dump_ndev, &req, buff, len);
+ break;
+
+ case COMM_EXIT:
+ case COMM_START_WRITE_NETDUMP_ACK:
+ ret = len;
+ goto out;
+
+ case COMM_HELLO:
+ sprintf(tmp, "Hello, this is netdump version "
+ "0.%02d\n", NETCONSOLE_VERSION);
+ reply.code = REPLY_HELLO;
+ reply.nr = req.nr;
+ reply.info = net_dev->curr_offset;
+ dump_send_skb(dump_ndev, tmp, strlen(tmp), &reply);
+ break;
+
+ case COMM_GET_PAGE_SIZE:
+ sprintf(tmp, "PAGE_SIZE: %ld\n", PAGE_SIZE);
+ reply.code = REPLY_PAGE_SIZE;
+ reply.nr = req.nr;
+ reply.info = PAGE_SIZE;
+ dump_send_skb(dump_ndev, tmp, strlen(tmp), &reply);
+ break;
+
+ case COMM_GET_NR_PAGES:
+ reply.code = REPLY_NR_PAGES;
+ reply.nr = req.nr;
+ reply.info = num_physpages;
+ reply.info = page_counter;
+ sprintf(tmp, "Number of pages: %ld\n", num_physpages);
+ dump_send_skb(dump_ndev, tmp, strlen(tmp), &reply);
+ break;
+
+ case COMM_GET_MAGIC:
+ reply.code = REPLY_MAGIC;
+ reply.nr = req.nr;
+ reply.info = NETCONSOLE_VERSION;
+ dump_send_skb(dump_ndev, (char *)&dump_magic,
+ sizeof(dump_magic), &reply);
+ break;
+
+ default:
+ reply.code = REPLY_ERROR;
+ reply.nr = req.nr;
+ reply.info = req.command;
+ sprintf(tmp, "Got unknown command code %d!\n",
+ req.command);
+ dump_send_skb(dump_ndev, tmp, strlen(tmp), &reply);
+ break;
+ }
+ }
+out:
+ netdump_in_progress = 0;
+ return ret;
+}
+
+static int
+dump_validate_config(void)
+{
+ source_ip = dump_in_dev->ifa_list->ifa_local;
+ if (!source_ip) {
+ printk("network device %s has no local address, "
+ "aborting.\n", device_name);
+ return -1;
+ }
+
+#define IP(x) ((unsigned char *)&source_ip)[x]
+ printk("Source %d.%d.%d.%d", IP(0), IP(1), IP(2), IP(3));
+#undef IP
+
+ if (!source_port) {
+ printk("source_port parameter not specified, aborting.\n");
+ return -1;
+ }
+ printk(":%i\n", source_port);
+ source_port = htons(source_port);
+
+ if (!target_ip) {
+ printk("target_ip parameter not specified, aborting.\n");
+ return -1;
+ }
+
+#define IP(x) ((unsigned char *)&target_ip)[x]
+ printk("Target %d.%d.%d.%d", IP(0), IP(1), IP(2), IP(3));
+#undef IP
+
+ if (!target_port) {
+ printk("target_port parameter not specified, aborting.\n");
+ return -1;
+ }
+ printk(":%i\n", target_port);
+ target_port = htons(target_port);
+
+ printk("Target Ethernet Address %02x:%02x:%02x:%02x:%02x:%02x",
+ daddr[0], daddr[1], daddr[2], daddr[3], daddr[4], daddr[5]);
+
+ if ((daddr[0] & daddr[1] & daddr[2] & daddr[3] & daddr[4] &
+ daddr[5]) == 255)
+ printk("(Broadcast)");
+ printk("\n");
+ return 0;
+}
+
+/*
+ * Prepares the dump device so we can take a dump later.
+ * Validates the netdump configuration parameters.
+ *
+ * TODO: Network connectivity check should be done here.
+ */
+static int
+dump_net_open(struct dump_dev *net_dev, unsigned long arg)
+{
+ int retval = 0;
+
+ /* get the interface name */
+ if (copy_from_user(device_name, (void *)arg, IFNAMSIZ))
+ return -EFAULT;
+
+ if (!(dump_ndev = dev_get_by_name(device_name))) {
+ printk("network device %s does not exist, aborting.\n",
+ device_name);
+ return -ENODEV;
+ }
+
+ if (!dump_ndev->poll_controller) {
+ printk("network device %s does not implement polling yet, "
+ "aborting.\n", device_name);
+ retval = -1; /* return proper error */
+ goto err1;
+ }
+
+ if (!(dump_in_dev = in_dev_get(dump_ndev))) {
+ printk("network device %s is not an IP protocol device, "
+ "aborting.\n", device_name);
+ retval = -EINVAL;
+ goto err1;
+ }
+
+ if ((retval = dump_validate_config()) < 0)
+ goto err2;
+
+ net_dev->curr_offset = 0;
+ printk("Network device %s successfully configured for dumping\n",
+ device_name);
+ return retval;
+err2:
+ in_dev_put(dump_in_dev);
+err1:
+ dev_put(dump_ndev);
+ return retval;
+}
+
+/*
+ * Close the dump device and release associated resources
+ * Invoked when unconfiguring the dump device.
+ */
+static int
+dump_net_release(struct dump_dev *net_dev)
+{
+ if (dump_in_dev)
+ in_dev_put(dump_in_dev);
+ if (dump_ndev)
+ dev_put(dump_ndev);
+ return 0;
+}
+
+/*
+ * Prepare the dump device for use (silence any ongoing activity
+ * and quiesce state) when the system crashes.
+ */
+static int
+dump_net_silence(struct dump_dev *net_dev)
+{
+ netpoll_set_trap(1);
+ local_irq_save(flags_global);
+ dump_ndev->rx_hook = dump_rx_hook;
+ startup_handshake = 1;
+ net_dev->curr_offset = 0;
+ printk("Dumping to network device %s on CPU %d ...\n", device_name,
+ smp_processor_id());
+ return 0;
+}
+
+/*
+ * Invoked when dumping is done. This is the time to put things back
+ * (i.e. undo the effects of dump_block_silence) so the device is
+ * available for normal use.
+ */
+static int
+dump_net_resume(struct dump_dev *net_dev)
+{
+ int indx;
+ reply_t reply;
+ char tmp[200];
+
+ if (!dump_ndev)
+ return (0);
+
+ sprintf(tmp, "NETDUMP end.\n");
+ for( indx = 0; indx < 6; indx++) {
+ reply.code = REPLY_END_NETDUMP;
+ reply.nr = 0;
+ reply.info = 0;
+ dump_send_skb(dump_ndev, tmp, strlen(tmp), &reply);
+ }
+ printk("NETDUMP END!\n");
+ local_irq_restore(flags_global);
+ netpoll_set_trap(0);
+ dump_ndev->rx_hook = NULL;
+ startup_handshake = 0;
+ return 0;
+}
+
+/*
+ * Seek to the specified offset in the dump device.
+ * Makes sure this is a valid offset, otherwise returns an error.
+ */
+static int
+dump_net_seek(struct dump_dev *net_dev, loff_t off)
+{
+ /*
+ * For now using DUMP_HEADER_OFFSET as hard coded value,
+ * See dump_block_seekin dump_blockdev.c to know how to
+ * do this properly.
+ */
+ net_dev->curr_offset = off;
+ return 0;
+}
+
+/*
+ *
+ */
+static int
+dump_net_write(struct dump_dev *net_dev, void *buf, unsigned long len)
+{
+ int cnt, i, off;
+ ssize_t ret;
+
+ cnt = len/ PAGE_SIZE;
+
+ for (i = 0; i < cnt; i++) {
+ off = i* PAGE_SIZE;
+ ret = do_netdump(net_dev, buf+off, PAGE_SIZE);
+ if (ret <= 0)
+ return -1;
+ net_dev->curr_offset = net_dev->curr_offset + PAGE_SIZE;
+ }
+ return len;
+}
+
+/*
+ * check if the last dump i/o is over and ready for next request
+ */
+static int
+dump_net_ready(struct dump_dev *net_dev, void *buf)
+{
+ return 0;
+}
+
+/*
+ * ioctl function used for configuring network dump
+ */
+static int
+dump_net_ioctl(struct dump_dev *net_dev, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case DIOSTARGETIP:
+ target_ip = arg;
+ break;
+ case DIOSTARGETPORT:
+ target_port = (u16)arg;
+ break;
+ case DIOSSOURCEPORT:
+ source_port = (u16)arg;
+ break;
+ case DIOSETHADDR:
+ return copy_from_user(daddr, (void *)arg, 6);
+ break;
+ case DIOGTARGETIP:
+ case DIOGTARGETPORT:
+ case DIOGSOURCEPORT:
+ case DIOGETHADDR:
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+struct dump_dev_ops dump_netdev_ops = {
+ .open = dump_net_open,
+ .release = dump_net_release,
+ .silence = dump_net_silence,
+ .resume = dump_net_resume,
+ .seek = dump_net_seek,
+ .write = dump_net_write,
+ /* .read not implemented */
+ .ready = dump_net_ready,
+ .ioctl = dump_net_ioctl
+};
+
+static struct dump_dev default_dump_netdev = {
+ .type_name = "networkdev",
+ .ops = &dump_netdev_ops,
+ .curr_offset = 0
+};
+
+static int __init
+dump_netdev_init(void)
+{
+ default_dump_netdev.curr_offset = 0;
+
+ if (dump_register_device(&default_dump_netdev) < 0) {
+ printk("network dump device driver registration failed\n");
+ return -1;
+ }
+ printk("network device driver for LKCD registered\n");
+
+ get_random_bytes(&dump_magic, sizeof(dump_magic));
+ return 0;
+}
+
+static void __exit
+dump_netdev_cleanup(void)
+{
+ dump_unregister_device(&default_dump_netdev);
+}
+
+MODULE_AUTHOR("LKCD Development Team <lkcd-devel@lists.sourceforge.net>");
+MODULE_DESCRIPTION("Network Dump Driver for Linux Kernel Crash Dump (LKCD)");
+MODULE_LICENSE("GPL");
+
+module_init(dump_netdev_init);
+module_exit(dump_netdev_cleanup);
--- /dev/null
+/*
+ * Two-stage soft-boot based dump scheme methods (memory overlay
+ * with post soft-boot writeout)
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya <suparna@in.ibm.com>
+ *
+ * This approach of saving the dump in memory and writing it
+ * out after a softboot without clearing memory is derived from the
+ * Mission Critical Linux dump implementation. Credits and a big
+ * thanks for letting the lkcd project make use of the excellent
+ * piece of work and also for helping with clarifications and
+ * tips along the way are due to:
+ * Dave Winchell <winchell@mclx.com> (primary author of mcore)
+ * and also to
+ * Jeff Moyer <moyer@mclx.com>
+ * Josh Huber <huber@mclx.com>
+ *
+ * For those familiar with the mcore implementation, the key
+ * differences/extensions here are in allowing entire memory to be
+ * saved (in compressed form) through a careful ordering scheme
+ * on both the way down as well on the way up after boot, the latter
+ * for supporting the LKCD notion of passes in which most critical
+ * data is the first to be saved to the dump device. Also the post
+ * boot writeout happens from within the kernel rather than driven
+ * from userspace.
+ *
+ * The sequence is orchestrated through the abstraction of "dumpers",
+ * one for the first stage which then sets up the dumper for the next
+ * stage, providing for a smooth and flexible reuse of the singlestage
+ * dump scheme methods and a handle to pass dump device configuration
+ * information across the soft boot.
+ *
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/*
+ * Disruptive dumping using the second kernel soft-boot option
+ * for issuing dump i/o operates in 2 stages:
+ *
+ * (1) - Saves the (compressed & formatted) dump in memory using a
+ * carefully ordered overlay scheme designed to capture the
+ * entire physical memory or selective portions depending on
+ * dump config settings,
+ * - Registers the stage 2 dumper and
+ * - Issues a soft reboot w/o clearing memory.
+ *
+ * The overlay scheme starts with a small bootstrap free area
+ * and follows a reverse ordering of passes wherein it
+ * compresses and saves data starting with the least critical
+ * areas first, thus freeing up the corresponding pages to
+ * serve as destination for subsequent data to be saved, and
+ * so on. With a good compression ratio, this makes it feasible
+ * to capture an entire physical memory dump without significantly
+ * reducing memory available during regular operation.
+ *
+ * (2) Post soft-reboot, runs through the saved memory dump and
+ * writes it out to disk, this time around, taking care to
+ * save the more critical data first (i.e. pages which figure
+ * in early passes for a regular dump). Finally issues a
+ * clean reboot.
+ *
+ * Since the data was saved in memory after selection/filtering
+ * and formatted as per the chosen output dump format, at this
+ * stage the filter and format actions are just dummy (or
+ * passthrough) actions, except for influence on ordering of
+ * passes.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+#include <linux/dump.h>
+#ifdef CONFIG_KEXEC
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/kexec.h>
+#endif
+#include "dump_methods.h"
+
+extern struct list_head dumper_list_head;
+extern struct dump_memdev *dump_memdev;
+extern struct dumper dumper_stage2;
+struct dump_config_block *dump_saved_config = NULL;
+extern struct dump_blockdev *dump_blockdev;
+static struct dump_memdev *saved_dump_memdev = NULL;
+static struct dumper *saved_dumper = NULL;
+
+#ifdef CONFIG_KEXEC
+extern int panic_timeout;
+#endif
+
+/* For testing
+extern void dump_display_map(struct dump_memdev *);
+*/
+
+struct dumper *dumper_by_name(char *name)
+{
+#ifdef LATER
+ struct dumper *dumper;
+ list_for_each_entry(dumper, &dumper_list_head, dumper_list)
+ if (!strncmp(dumper->name, name, 32))
+ return dumper;
+
+ /* not found */
+ return NULL;
+#endif
+ /* Temporary proof of concept */
+ if (!strncmp(dumper_stage2.name, name, 32))
+ return &dumper_stage2;
+ else
+ return NULL;
+}
+
+#ifdef CONFIG_CRASH_DUMP_SOFTBOOT
+extern void dump_early_reserve_map(struct dump_memdev *);
+
+void crashdump_reserve(void)
+{
+ extern unsigned long crashdump_addr;
+
+ if (crashdump_addr == 0xdeadbeef)
+ return;
+
+ /* reserve dump config and saved dump pages */
+ dump_saved_config = (struct dump_config_block *)crashdump_addr;
+ /* magic verification */
+ if (dump_saved_config->magic != DUMP_MAGIC_LIVE) {
+ printk("Invalid dump magic. Ignoring dump\n");
+ dump_saved_config = NULL;
+ return;
+ }
+
+ printk("Dump may be available from previous boot\n");
+
+ reserve_bootmem(virt_to_phys((void *)crashdump_addr),
+ PAGE_ALIGN(sizeof(struct dump_config_block)));
+ dump_early_reserve_map(&dump_saved_config->memdev);
+
+}
+#endif
+
+/*
+ * Loads the dump configuration from a memory block saved across soft-boot
+ * The ops vectors need fixing up as the corresp. routines may have
+ * relocated in the new soft-booted kernel.
+ */
+int dump_load_config(struct dump_config_block *config)
+{
+ struct dumper *dumper;
+ struct dump_data_filter *filter_table, *filter;
+ struct dump_dev *dev;
+ int i;
+
+ if (config->magic != DUMP_MAGIC_LIVE)
+ return -ENOENT; /* not a valid config */
+
+ /* initialize generic config data */
+ memcpy(&dump_config, &config->config, sizeof(dump_config));
+
+ /* initialize dumper state */
+ if (!(dumper = dumper_by_name(config->dumper.name))) {
+ printk("dumper name mismatch\n");
+ return -ENOENT; /* dumper mismatch */
+ }
+
+ /* verify and fixup schema */
+ if (strncmp(dumper->scheme->name, config->scheme.name, 32)) {
+ printk("dumper scheme mismatch\n");
+ return -ENOENT; /* mismatch */
+ }
+ config->scheme.ops = dumper->scheme->ops;
+ config->dumper.scheme = &config->scheme;
+
+ /* verify and fixup filter operations */
+ filter_table = dumper->filter;
+ for (i = 0, filter = config->filter_table;
+ ((i < MAX_PASSES) && filter_table[i].selector);
+ i++, filter++) {
+ if (strncmp(filter_table[i].name, filter->name, 32)) {
+ printk("dump filter mismatch\n");
+ return -ENOENT; /* filter name mismatch */
+ }
+ filter->selector = filter_table[i].selector;
+ }
+ config->dumper.filter = config->filter_table;
+
+ /* fixup format */
+ if (strncmp(dumper->fmt->name, config->fmt.name, 32)) {
+ printk("dump format mismatch\n");
+ return -ENOENT; /* mismatch */
+ }
+ config->fmt.ops = dumper->fmt->ops;
+ config->dumper.fmt = &config->fmt;
+
+ /* fixup target device */
+ dev = (struct dump_dev *)(&config->dev[0]);
+ if (dumper->dev == NULL) {
+ pr_debug("Vanilla dumper - assume default\n");
+ if (dump_dev == NULL)
+ return -ENODEV;
+ dumper->dev = dump_dev;
+ }
+
+ if (strncmp(dumper->dev->type_name, dev->type_name, 32)) {
+ printk("dump dev type mismatch %s instead of %s\n",
+ dev->type_name, dumper->dev->type_name);
+ return -ENOENT; /* mismatch */
+ }
+ dev->ops = dumper->dev->ops;
+ config->dumper.dev = dev;
+
+ /* fixup memory device containing saved dump pages */
+ /* assume statically init'ed dump_memdev */
+ config->memdev.ddev.ops = dump_memdev->ddev.ops;
+ /* switch to memdev from prev boot */
+ saved_dump_memdev = dump_memdev; /* remember current */
+ dump_memdev = &config->memdev;
+
+ /* Make this the current primary dumper */
+ dump_config.dumper = &config->dumper;
+
+ return 0;
+}
+
+/* Saves the dump configuration in a memory block for use across a soft-boot */
+int dump_save_config(struct dump_config_block *config)
+{
+ printk("saving dump config settings\n");
+
+ /* dump config settings */
+ memcpy(&config->config, &dump_config, sizeof(dump_config));
+
+ /* dumper state */
+ memcpy(&config->dumper, dump_config.dumper, sizeof(struct dumper));
+ memcpy(&config->scheme, dump_config.dumper->scheme,
+ sizeof(struct dump_scheme));
+ memcpy(&config->fmt, dump_config.dumper->fmt, sizeof(struct dump_fmt));
+ memcpy(&config->dev[0], dump_config.dumper->dev,
+ sizeof(struct dump_anydev));
+ memcpy(&config->filter_table, dump_config.dumper->filter,
+ sizeof(struct dump_data_filter)*MAX_PASSES);
+
+ /* handle to saved mem pages */
+ memcpy(&config->memdev, dump_memdev, sizeof(struct dump_memdev));
+
+ config->magic = DUMP_MAGIC_LIVE;
+
+ return 0;
+}
+
+int dump_init_stage2(struct dump_config_block *saved_config)
+{
+ int err = 0;
+
+ pr_debug("dump_init_stage2\n");
+ /* Check if dump from previous boot exists */
+ if (saved_config) {
+ printk("loading dumper from previous boot \n");
+ /* load and configure dumper from previous boot */
+ if ((err = dump_load_config(saved_config)))
+ return err;
+
+ if (!dump_oncpu) {
+ if ((err = dump_configure(dump_config.dump_device))) {
+ printk("Stage 2 dump configure failed\n");
+ return err;
+ }
+ }
+
+ dumper_reset();
+ dump_dev = dump_config.dumper->dev;
+ /* write out the dump */
+ err = dump_generic_execute(NULL, NULL);
+
+ dump_saved_config = NULL;
+
+ if (!dump_oncpu) {
+ dump_unconfigure();
+ }
+
+ return err;
+
+ } else {
+ /* no dump to write out */
+ printk("no dumper from previous boot \n");
+ return 0;
+ }
+}
+
+extern void dump_mem_markpages(struct dump_memdev *);
+
+int dump_switchover_stage(void)
+{
+ int ret = 0;
+
+ /* trigger stage 2 rightaway - in real life would be after soft-boot */
+ /* dump_saved_config would be a boot param */
+ saved_dump_memdev = dump_memdev;
+ saved_dumper = dump_config.dumper;
+ ret = dump_init_stage2(dump_saved_config);
+ dump_memdev = saved_dump_memdev;
+ dump_config.dumper = saved_dumper;
+ return ret;
+}
+
+int dump_activate_softboot(void)
+{
+ int err = 0;
+#ifdef CONFIG_KEXEC
+ int num_cpus_online = 0;
+ struct kimage *image;
+#endif
+
+ /* temporary - switchover to writeout previously saved dump */
+#ifndef CONFIG_KEXEC
+ err = dump_switchover_stage(); /* non-disruptive case */
+ if (dump_oncpu)
+ dump_config.dumper = &dumper_stage1; /* set things back */
+
+ return err;
+#else
+
+ dump_silence_level = DUMP_HALT_CPUS;
+ /* wait till we become the only cpu */
+ /* maybe by checking for online cpus ? */
+
+ while((num_cpus_online = num_online_cpus()) > 1);
+
+ /* now call into kexec */
+
+ image = xchg(&kexec_image, 0);
+ if (image) {
+ mdelay(panic_timeout*1000);
+ machine_kexec(image);
+ }
+
+
+ /* TBD/Fixme:
+ * * should we call reboot notifiers ? inappropriate for panic ?
+ * * what about device_shutdown() ?
+ * * is explicit bus master disabling needed or can we do that
+ * * through driverfs ?
+ * */
+ return 0;
+#endif
+}
+
+/* --- DUMP SCHEME ROUTINES --- */
+
+static inline int dump_buf_pending(struct dumper *dumper)
+{
+ return (dumper->curr_buf - dumper->dump_buf);
+}
+
+/* Invoked during stage 1 of soft-reboot based dumping */
+int dump_overlay_sequencer(void)
+{
+ struct dump_data_filter *filter = dump_config.dumper->filter;
+ struct dump_data_filter *filter2 = dumper_stage2.filter;
+ int pass = 0, err = 0, save = 0;
+ int (*action)(unsigned long, unsigned long);
+
+ /* Make sure gzip compression is being used */
+ if (dump_config.dumper->compress->compress_type != DUMP_COMPRESS_GZIP) {
+ printk(" Please set GZIP compression \n");
+ return -EINVAL;
+ }
+
+ /* start filling in dump data right after the header */
+ dump_config.dumper->curr_offset =
+ PAGE_ALIGN(dump_config.dumper->header_len);
+
+ /* Locate the last pass */
+ for (;filter->selector; filter++, pass++);
+
+ /*
+ * Start from the end backwards: overlay involves a reverse
+ * ordering of passes, since less critical pages are more
+ * likely to be reusable as scratch space once we are through
+ * with them.
+ */
+ for (--pass, --filter; pass >= 0; pass--, filter--)
+ {
+ /* Assumes passes are exclusive (even across dumpers) */
+ /* Requires care when coding the selection functions */
+ if ((save = filter->level_mask & dump_config.level))
+ action = dump_save_data;
+ else
+ action = dump_skip_data;
+
+ /* Remember the offset where this pass started */
+ /* The second stage dumper would use this */
+ if (dump_buf_pending(dump_config.dumper) & (PAGE_SIZE - 1)) {
+ pr_debug("Starting pass %d with pending data\n", pass);
+ pr_debug("filling dummy data to page-align it\n");
+ dump_config.dumper->curr_buf = (void *)PAGE_ALIGN(
+ (unsigned long)dump_config.dumper->curr_buf);
+ }
+
+ filter2[pass].start[0] = dump_config.dumper->curr_offset
+ + dump_buf_pending(dump_config.dumper);
+
+ err = dump_iterator(pass, action, filter);
+
+ filter2[pass].end[0] = dump_config.dumper->curr_offset
+ + dump_buf_pending(dump_config.dumper);
+ filter2[pass].num_mbanks = 1;
+
+ if (err < 0) {
+ printk("dump_overlay_seq: failure %d in pass %d\n",
+ err, pass);
+ break;
+ }
+ printk("\n %d overlay pages %s of %d each in pass %d\n",
+ err, save ? "saved" : "skipped", DUMP_PAGE_SIZE, pass);
+ }
+
+ return err;
+}
+
+/* from dump_memdev.c */
+extern struct page *dump_mem_lookup(struct dump_memdev *dev, unsigned long loc);
+extern struct page *dump_mem_next_page(struct dump_memdev *dev);
+
+static inline struct page *dump_get_saved_page(loff_t loc)
+{
+ return (dump_mem_lookup(dump_memdev, loc >> PAGE_SHIFT));
+}
+
+static inline struct page *dump_next_saved_page(void)
+{
+ return (dump_mem_next_page(dump_memdev));
+}
+
+/*
+ * Iterates over list of saved dump pages. Invoked during second stage of
+ * soft boot dumping
+ *
+ * Observation: If additional selection is desired at this stage then
+ * a different iterator could be written which would advance
+ * to the next page header everytime instead of blindly picking up
+ * the data. In such a case loc would be interpreted differently.
+ * At this moment however a blind pass seems sufficient, cleaner and
+ * faster.
+ */
+int dump_saved_data_iterator(int pass, int (*action)(unsigned long,
+ unsigned long), struct dump_data_filter *filter)
+{
+ loff_t loc, end;
+ struct page *page;
+ unsigned long count = 0;
+ int i, err = 0;
+ unsigned long sz;
+
+ for (i = 0; i < filter->num_mbanks; i++) {
+ loc = filter->start[i];
+ end = filter->end[i];
+ printk("pass %d, start off 0x%llx end offset 0x%llx\n", pass,
+ loc, end);
+
+ /* loc will get treated as logical offset into stage 1 */
+ page = dump_get_saved_page(loc);
+
+ for (; loc < end; loc += PAGE_SIZE) {
+ dump_config.dumper->curr_loc = loc;
+ if (!page) {
+ printk("no more saved data for pass %d\n",
+ pass);
+ break;
+ }
+ sz = (loc + PAGE_SIZE > end) ? end - loc : PAGE_SIZE;
+
+ if (page && filter->selector(pass, (unsigned long)page,
+ PAGE_SIZE)) {
+ pr_debug("mem offset 0x%llx\n", loc);
+ if ((err = action((unsigned long)page, sz)))
+ break;
+ else
+ count++;
+ /* clear the contents of page */
+ /* fixme: consider using KM_DUMP instead */
+ clear_highpage(page);
+
+ }
+ page = dump_next_saved_page();
+ }
+ }
+
+ return err ? err : count;
+}
+
+static inline int dump_overlay_pages_done(struct page *page, int nr)
+{
+ int ret=0;
+
+ for (; nr ; page++, nr--) {
+ if (dump_check_and_free_page(dump_memdev, page))
+ ret++;
+ }
+ return ret;
+}
+
+int dump_overlay_save_data(unsigned long loc, unsigned long len)
+{
+ int err = 0;
+ struct page *page = (struct page *)loc;
+ static unsigned long cnt = 0;
+
+ if ((err = dump_generic_save_data(loc, len)))
+ return err;
+
+ if (dump_overlay_pages_done(page, len >> PAGE_SHIFT)) {
+ cnt++;
+ if (!(cnt & 0x7f))
+ pr_debug("released page 0x%lx\n", page_to_pfn(page));
+ }
+
+ return err;
+}
+
+
+int dump_overlay_skip_data(unsigned long loc, unsigned long len)
+{
+ struct page *page = (struct page *)loc;
+
+ dump_overlay_pages_done(page, len >> PAGE_SHIFT);
+ return 0;
+}
+
+int dump_overlay_resume(void)
+{
+ int err = 0;
+
+ /*
+ * switch to stage 2 dumper, save dump_config_block
+ * and then trigger a soft-boot
+ */
+ dumper_stage2.header_len = dump_config.dumper->header_len;
+ dump_config.dumper = &dumper_stage2;
+ if ((err = dump_save_config(dump_saved_config)))
+ return err;
+
+ dump_dev = dump_config.dumper->dev;
+
+#ifdef CONFIG_KEXEC
+ /* If we are doing a disruptive dump, activate softboot now */
+ if((panic_timeout > 0) && (!(dump_config.flags & DUMP_FLAGS_NONDISRUPT)))
+ err = dump_activate_softboot();
+#endif
+
+ return err;
+ err = dump_switchover_stage(); /* plugs into soft boot mechanism */
+ dump_config.dumper = &dumper_stage1; /* set things back */
+ return err;
+}
+
+int dump_overlay_configure(unsigned long devid)
+{
+ struct dump_dev *dev;
+ struct dump_config_block *saved_config = dump_saved_config;
+ int err = 0;
+
+ /* If there is a previously saved dump, write it out first */
+ if (saved_config) {
+ printk("Processing old dump pending writeout\n");
+ err = dump_switchover_stage();
+ if (err) {
+ printk("failed to writeout saved dump\n");
+ return err;
+ }
+ dump_free_mem(saved_config); /* testing only: not after boot */
+ }
+
+ dev = dumper_stage2.dev = dump_config.dumper->dev;
+ /* From here on the intermediate dump target is memory-only */
+ dump_dev = dump_config.dumper->dev = &dump_memdev->ddev;
+ if ((err = dump_generic_configure(0))) {
+ printk("dump generic configure failed: err %d\n", err);
+ return err;
+ }
+ /* temporary */
+ dumper_stage2.dump_buf = dump_config.dumper->dump_buf;
+
+ /* Sanity check on the actual target dump device */
+ if (!dev || (err = dev->ops->open(dev, devid))) {
+ return err;
+ }
+ /* TBD: should we release the target if this is soft-boot only ? */
+
+ /* alloc a dump config block area to save across reboot */
+ if (!(dump_saved_config = dump_alloc_mem(sizeof(struct
+ dump_config_block)))) {
+ printk("dump config block alloc failed\n");
+ /* undo configure */
+ dump_generic_unconfigure();
+ return -ENOMEM;
+ }
+ dump_config.dump_addr = (unsigned long)dump_saved_config;
+ printk("Dump config block of size %d set up at 0x%lx\n",
+ sizeof(*dump_saved_config), (unsigned long)dump_saved_config);
+ return 0;
+}
+
+int dump_overlay_unconfigure(void)
+{
+ struct dump_dev *dev = dumper_stage2.dev;
+ int err = 0;
+
+ pr_debug("dump_overlay_unconfigure\n");
+ /* Close the secondary device */
+ dev->ops->release(dev);
+ pr_debug("released secondary device\n");
+
+ err = dump_generic_unconfigure();
+ pr_debug("Unconfigured generic portions\n");
+ dump_free_mem(dump_saved_config);
+ dump_saved_config = NULL;
+ pr_debug("Freed saved config block\n");
+ dump_dev = dump_config.dumper->dev = dumper_stage2.dev;
+
+ printk("Unconfigured overlay dumper\n");
+ return err;
+}
+
+int dump_staged_unconfigure(void)
+{
+ int err = 0;
+ struct dump_config_block *saved_config = dump_saved_config;
+ struct dump_dev *dev;
+
+ pr_debug("dump_staged_unconfigure\n");
+ err = dump_generic_unconfigure();
+
+ /* now check if there is a saved dump waiting to be written out */
+ if (saved_config) {
+ printk("Processing saved dump pending writeout\n");
+ if ((err = dump_switchover_stage())) {
+ printk("Error in commiting saved dump at 0x%lx\n",
+ (unsigned long)saved_config);
+ printk("Old dump may hog memory\n");
+ } else {
+ dump_free_mem(saved_config);
+ pr_debug("Freed saved config block\n");
+ }
+ dump_saved_config = NULL;
+ } else {
+ dev = &dump_memdev->ddev;
+ dev->ops->release(dev);
+ }
+ printk("Unconfigured second stage dumper\n");
+
+ return 0;
+}
+
+/* ----- PASSTHRU FILTER ROUTINE --------- */
+
+/* transparent - passes everything through */
+int dump_passthru_filter(int pass, unsigned long loc, unsigned long sz)
+{
+ return 1;
+}
+
+/* ----- PASSTRU FORMAT ROUTINES ---- */
+
+
+int dump_passthru_configure_header(const char *panic_str, const struct pt_regs *regs)
+{
+ dump_config.dumper->header_dirty++;
+ return 0;
+}
+
+/* Copies bytes of data from page(s) to the specified buffer */
+int dump_copy_pages(void *buf, struct page *page, unsigned long sz)
+{
+ unsigned long len = 0, bytes;
+ void *addr;
+
+ while (len < sz) {
+ addr = kmap_atomic(page, KM_DUMP);
+ bytes = (sz > len + PAGE_SIZE) ? PAGE_SIZE : sz - len;
+ memcpy(buf, addr, bytes);
+ kunmap_atomic(addr, KM_DUMP);
+ buf += bytes;
+ len += bytes;
+ page++;
+ }
+ /* memset(dump_config.dumper->curr_buf, 0x57, len); temporary */
+
+ return sz - len;
+}
+
+int dump_passthru_update_header(void)
+{
+ long len = dump_config.dumper->header_len;
+ struct page *page;
+ void *buf = dump_config.dumper->dump_buf;
+ int err = 0;
+
+ if (!dump_config.dumper->header_dirty)
+ return 0;
+
+ pr_debug("Copying header of size %ld bytes from memory\n", len);
+ if (len > DUMP_BUFFER_SIZE)
+ return -E2BIG;
+
+ page = dump_mem_lookup(dump_memdev, 0);
+ for (; (len > 0) && page; buf += PAGE_SIZE, len -= PAGE_SIZE) {
+ if ((err = dump_copy_pages(buf, page, PAGE_SIZE)))
+ return err;
+ page = dump_mem_next_page(dump_memdev);
+ }
+ if (len > 0) {
+ printk("Incomplete header saved in mem\n");
+ return -ENOENT;
+ }
+
+ if ((err = dump_dev_seek(0))) {
+ printk("Unable to seek to dump header offset\n");
+ return err;
+ }
+ err = dump_ll_write(dump_config.dumper->dump_buf,
+ buf - dump_config.dumper->dump_buf);
+ if (err < dump_config.dumper->header_len)
+ return (err < 0) ? err : -ENOSPC;
+
+ dump_config.dumper->header_dirty = 0;
+ return 0;
+}
+
+static loff_t next_dph_offset = 0;
+
+static int dph_valid(struct __dump_page *dph)
+{
+ if ((dph->dp_address & (PAGE_SIZE - 1)) || (dph->dp_flags
+ > DUMP_DH_COMPRESSED) || (!dph->dp_flags) ||
+ (dph->dp_size > PAGE_SIZE)) {
+ printk("dp->address = 0x%llx, dp->size = 0x%x, dp->flag = 0x%x\n",
+ dph->dp_address, dph->dp_size, dph->dp_flags);
+ return 0;
+ }
+ return 1;
+}
+
+int dump_verify_lcrash_data(void *buf, unsigned long sz)
+{
+ struct __dump_page *dph;
+
+ /* sanity check for page headers */
+ while (next_dph_offset + sizeof(*dph) < sz) {
+ dph = (struct __dump_page *)(buf + next_dph_offset);
+ if (!dph_valid(dph)) {
+ printk("Invalid page hdr at offset 0x%llx\n",
+ next_dph_offset);
+ return -EINVAL;
+ }
+ next_dph_offset += dph->dp_size + sizeof(*dph);
+ }
+
+ next_dph_offset -= sz;
+ return 0;
+}
+
+/*
+ * TBD/Later: Consider avoiding the copy by using a scatter/gather
+ * vector representation for the dump buffer
+ */
+int dump_passthru_add_data(unsigned long loc, unsigned long sz)
+{
+ struct page *page = (struct page *)loc;
+ void *buf = dump_config.dumper->curr_buf;
+ int err = 0;
+
+ if ((err = dump_copy_pages(buf, page, sz))) {
+ printk("dump_copy_pages failed");
+ return err;
+ }
+
+ if ((err = dump_verify_lcrash_data(buf, sz))) {
+ printk("dump_verify_lcrash_data failed\n");
+ printk("Invalid data for pfn 0x%lx\n", page_to_pfn(page));
+ printk("Page flags 0x%lx\n", page->flags);
+ printk("Page count 0x%x\n", atomic_read(&page->count));
+ return err;
+ }
+
+ dump_config.dumper->curr_buf = buf + sz;
+
+ return 0;
+}
+
+
+/* Stage 1 dumper: Saves compressed dump in memory and soft-boots system */
+
+/* Scheme to overlay saved data in memory for writeout after a soft-boot */
+struct dump_scheme_ops dump_scheme_overlay_ops = {
+ .configure = dump_overlay_configure,
+ .unconfigure = dump_overlay_unconfigure,
+ .sequencer = dump_overlay_sequencer,
+ .iterator = dump_page_iterator,
+ .save_data = dump_overlay_save_data,
+ .skip_data = dump_overlay_skip_data,
+ .write_buffer = dump_generic_write_buffer
+};
+
+struct dump_scheme dump_scheme_overlay = {
+ .name = "overlay",
+ .ops = &dump_scheme_overlay_ops
+};
+
+
+/* Stage 1 must use a good compression scheme - default to gzip */
+extern struct __dump_compress dump_gzip_compression;
+
+struct dumper dumper_stage1 = {
+ .name = "stage1",
+ .scheme = &dump_scheme_overlay,
+ .fmt = &dump_fmt_lcrash,
+ .compress = &dump_none_compression, /* needs to be gzip */
+ .filter = dump_filter_table,
+ .dev = NULL,
+};
+
+/* Stage 2 dumper: Activated after softboot to write out saved dump to device */
+
+/* Formatter that transfers data as is (transparent) w/o further conversion */
+struct dump_fmt_ops dump_fmt_passthru_ops = {
+ .configure_header = dump_passthru_configure_header,
+ .update_header = dump_passthru_update_header,
+ .save_context = NULL, /* unused */
+ .add_data = dump_passthru_add_data,
+ .update_end_marker = dump_lcrash_update_end_marker
+};
+
+struct dump_fmt dump_fmt_passthru = {
+ .name = "passthru",
+ .ops = &dump_fmt_passthru_ops
+};
+
+/* Filter that simply passes along any data within the range (transparent)*/
+/* Note: The start and end ranges in the table are filled in at run-time */
+
+extern int dump_filter_none(int pass, unsigned long loc, unsigned long sz);
+
+struct dump_data_filter dump_passthru_filtertable[MAX_PASSES] = {
+{.name = "passkern", .selector = dump_passthru_filter,
+ .level_mask = DUMP_MASK_KERN },
+{.name = "passuser", .selector = dump_passthru_filter,
+ .level_mask = DUMP_MASK_USED },
+{.name = "passunused", .selector = dump_passthru_filter,
+ .level_mask = DUMP_MASK_UNUSED },
+{.name = "none", .selector = dump_filter_none,
+ .level_mask = DUMP_MASK_REST }
+};
+
+
+/* Scheme to handle data staged / preserved across a soft-boot */
+struct dump_scheme_ops dump_scheme_staged_ops = {
+ .configure = dump_generic_configure,
+ .unconfigure = dump_staged_unconfigure,
+ .sequencer = dump_generic_sequencer,
+ .iterator = dump_saved_data_iterator,
+ .save_data = dump_generic_save_data,
+ .skip_data = dump_generic_skip_data,
+ .write_buffer = dump_generic_write_buffer
+};
+
+struct dump_scheme dump_scheme_staged = {
+ .name = "staged",
+ .ops = &dump_scheme_staged_ops
+};
+
+/* The stage 2 dumper comprising all these */
+struct dumper dumper_stage2 = {
+ .name = "stage2",
+ .scheme = &dump_scheme_staged,
+ .fmt = &dump_fmt_passthru,
+ .compress = &dump_none_compression,
+ .filter = dump_passthru_filtertable,
+ .dev = NULL,
+};
+
--- /dev/null
+/*
+ * Architecture specific (ppc64) functions for Linux crash dumps.
+ *
+ * Created by: Matt Robinson (yakker@sgi.com)
+ *
+ * Copyright 1999 Silicon Graphics, Inc. All rights reserved.
+ *
+ * 2.3 kernel modifications by: Matt D. Robinson (yakker@turbolinux.com)
+ * Copyright 2000 TurboLinux, Inc. All rights reserved.
+ * Copyright 2003, 2004 IBM Corporation
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/*
+ * The hooks for dumping the kernel virtual memory to disk are in this
+ * file. Any time a modification is made to the virtual memory mechanism,
+ * these routines must be changed to use the new mechanisms.
+ */
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/dump.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/syscalls.h>
+#include <linux/ioctl32.h>
+#include <asm/hardirq.h>
+#include "dump_methods.h"
+#include <linux/irq.h>
+#include <asm/machdep.h>
+#include <asm/uaccess.h>
+#include <asm/irq.h>
+#include <asm/page.h>
+#if defined(CONFIG_KDB) && !defined(CONFIG_DUMP_MODULE)
+#include <linux/kdb.h>
+#endif
+
+extern cpumask_t irq_affinity[];
+
+static cpumask_t saved_affinity[NR_IRQS];
+
+static __s32 saved_irq_count; /* saved preempt_count() flags */
+
+static int alloc_dha_stack(void)
+{
+ int i;
+ void *ptr;
+
+ if (dump_header_asm.dha_stack[0])
+ return 0;
+
+ ptr = (void *)vmalloc(THREAD_SIZE * num_online_cpus());
+ if (!ptr) {
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < num_online_cpus(); i++) {
+ dump_header_asm.dha_stack[i] =
+ (uint64_t)((unsigned long)ptr + (i * THREAD_SIZE));
+ }
+ return 0;
+}
+
+static int free_dha_stack(void)
+{
+ if (dump_header_asm.dha_stack[0]) {
+ vfree((void*)dump_header_asm.dha_stack[0]);
+ dump_header_asm.dha_stack[0] = 0;
+ }
+ return 0;
+}
+#ifdef CONFIG_SMP
+static int dump_expect_ipi[NR_CPUS];
+static atomic_t waiting_for_dump_ipi;
+
+extern void stop_this_cpu(void *);
+static int
+dump_ipi_handler(struct pt_regs *regs)
+{
+ int cpu = smp_processor_id();
+
+ if (!dump_expect_ipi[cpu])
+ return 0;
+ dump_save_this_cpu(regs);
+ atomic_dec(&waiting_for_dump_ipi);
+
+ level_changed:
+ switch (dump_silence_level) {
+ case DUMP_HARD_SPIN_CPUS: /* Spin until dump is complete */
+ while (dump_oncpu) {
+ barrier(); /* paranoia */
+ if (dump_silence_level != DUMP_HARD_SPIN_CPUS)
+ goto level_changed;
+ cpu_relax(); /* kill time nicely */
+ }
+ break;
+
+ case DUMP_HALT_CPUS: /* Execute halt */
+ stop_this_cpu(NULL);
+ break;
+
+ case DUMP_SOFT_SPIN_CPUS:
+ /* Mark the task so it spins in schedule */
+ set_tsk_thread_flag(current, TIF_NEED_RESCHED);
+ break;
+ }
+
+ return 1;
+}
+
+/* save registers on other processors
+ * If the other cpus don't respond we simply do not get their states.
+ */
+void
+__dump_save_other_cpus(void)
+{
+ int i, cpu = smp_processor_id();
+ int other_cpus = num_online_cpus()-1;
+
+ if (other_cpus > 0) {
+ atomic_set(&waiting_for_dump_ipi, other_cpus);
+ for (i = 0; i < NR_CPUS; i++)
+ dump_expect_ipi[i] = (i != cpu && cpu_online(i));
+
+ dump_send_ipi(dump_ipi_handler);
+ /*
+ * may be we dont need to wait for NMI to be processed.
+ * just write out the header at the end of dumping, if
+ * this IPI is not processed until then, there probably
+ * is a problem and we just fail to capture state of
+ * other cpus.
+ */
+ while (atomic_read(&waiting_for_dump_ipi) > 0) {
+ cpu_relax();
+ }
+ dump_send_ipi(NULL); /* clear handler */
+ }
+}
+
+/*
+ * Restore old irq affinities.
+ */
+static void
+__dump_reset_irq_affinity(void)
+{
+ int i;
+ irq_desc_t *irq_d;
+
+ memcpy(irq_affinity, saved_affinity, NR_IRQS * sizeof(unsigned long));
+
+ for_each_irq(i) {
+ irq_d = get_irq_desc(i);
+ if (irq_d->handler == NULL) {
+ continue;
+ }
+ if (irq_d->handler->set_affinity != NULL) {
+ irq_d->handler->set_affinity(i, saved_affinity[i]);
+ }
+ }
+}
+
+/*
+ * Routine to save the old irq affinities and change affinities of all irqs to
+ * the dumping cpu.
+ *
+ * NB: Need to be expanded to multiple nodes.
+ */
+static void
+__dump_set_irq_affinity(void)
+{
+ int i;
+ cpumask_t cpu = CPU_MASK_NONE;
+ irq_desc_t *irq_d;
+
+ cpu_set(smp_processor_id(), cpu);
+
+ memcpy(saved_affinity, irq_affinity, NR_IRQS * sizeof(unsigned long));
+
+ for_each_irq(i) {
+ irq_d = get_irq_desc(i);
+ if (irq_d->handler == NULL) {
+ continue;
+ }
+ irq_affinity[i] = cpu;
+ if (irq_d->handler->set_affinity != NULL) {
+ irq_d->handler->set_affinity(i, irq_affinity[i]);
+ }
+ }
+}
+#else /* !CONFIG_SMP */
+#define __dump_save_other_cpus() do { } while (0)
+#define __dump_set_irq_affinity() do { } while (0)
+#define __dump_reset_irq_affinity() do { } while (0)
+#endif /* !CONFIG_SMP */
+
+void
+__dump_save_regs(struct pt_regs *dest_regs, const struct pt_regs *regs)
+{
+ if (regs) {
+ memcpy(dest_regs, regs, sizeof(struct pt_regs));
+ }
+}
+
+/*
+ * Name: __dump_configure_header()
+ * Func: Configure the dump header with all proper values.
+ */
+int
+__dump_configure_header(const struct pt_regs *regs)
+{
+ return (0);
+}
+
+#if defined(CONFIG_KDB) && !defined(CONFIG_DUMP_MODULE)
+int
+kdb_sysdump(int argc, const char **argv, const char **envp, struct pt_regs *regs)
+{
+ kdb_printf("Dumping to disk...\n");
+ dump("dump from kdb", regs);
+ kdb_printf("Dump Complete\n");
+ return 0;
+}
+#endif
+
+static int dw_long(unsigned int fd, unsigned int cmd, unsigned long arg,
+ struct file *f)
+{
+ mm_segment_t old_fs = get_fs();
+ int err;
+ unsigned long val;
+
+ set_fs (KERNEL_DS);
+ err = sys_ioctl(fd, cmd, (unsigned long)&val);
+ set_fs (old_fs);
+ if (!err && put_user((unsigned int) val, (u32 *)arg))
+ return -EFAULT;
+ return err;
+}
+
+/*
+ * Name: __dump_init()
+ * Func: Initialize the dumping routine process. This is in case
+ * it's necessary in the future.
+ */
+void
+__dump_init(uint64_t local_memory_start)
+{
+ int ret;
+
+ ret = register_ioctl32_conversion(DIOSDUMPDEV, NULL);
+ ret |= register_ioctl32_conversion(DIOGDUMPDEV, NULL);
+ ret |= register_ioctl32_conversion(DIOSDUMPLEVEL, NULL);
+ ret |= register_ioctl32_conversion(DIOGDUMPLEVEL, dw_long);
+ ret |= register_ioctl32_conversion(DIOSDUMPFLAGS, NULL);
+ ret |= register_ioctl32_conversion(DIOGDUMPFLAGS, dw_long);
+ ret |= register_ioctl32_conversion(DIOSDUMPCOMPRESS, NULL);
+ ret |= register_ioctl32_conversion(DIOGDUMPCOMPRESS, dw_long);
+ ret |= register_ioctl32_conversion(DIOSTARGETIP, NULL);
+ ret |= register_ioctl32_conversion(DIOGTARGETIP, NULL);
+ ret |= register_ioctl32_conversion(DIOSTARGETPORT, NULL);
+ ret |= register_ioctl32_conversion(DIOGTARGETPORT, NULL);
+ ret |= register_ioctl32_conversion(DIOSSOURCEPORT, NULL);
+ ret |= register_ioctl32_conversion(DIOGSOURCEPORT, NULL);
+ ret |= register_ioctl32_conversion(DIOSETHADDR, NULL);
+ ret |= register_ioctl32_conversion(DIOGETHADDR, NULL);
+ ret |= register_ioctl32_conversion(DIOGDUMPOKAY, dw_long);
+ ret |= register_ioctl32_conversion(DIOSDUMPTAKE, NULL);
+ if (ret) {
+ printk(KERN_ERR "LKCD: registering ioctl32 translations failed\n");
+ }
+
+#if defined(FIXME) && defined(CONFIG_KDB) && !defined(CONFIG_DUMP_MODULE)
+ /* This won't currently work because interrupts are off in kdb
+ * and the dump process doesn't understand how to recover.
+ */
+ /* ToDo: add a command to query/set dump configuration */
+ kdb_register_repeat("sysdump", kdb_sysdump, "", "use lkcd to dump the system to disk (if configured)", 0, KDB_REPEAT_NONE);
+#endif
+
+ /* return */
+ return;
+}
+
+/*
+ * Name: __dump_open()
+ * Func: Open the dump device (architecture specific). This is in
+ * case it's necessary in the future.
+ */
+void
+__dump_open(void)
+{
+ alloc_dha_stack();
+}
+
+
+/*
+ * Name: __dump_cleanup()
+ * Func: Free any architecture specific data structures. This is called
+ * when the dump module is being removed.
+ */
+void
+__dump_cleanup(void)
+{
+ int ret;
+
+ ret = unregister_ioctl32_conversion(DIOSDUMPDEV);
+ ret |= unregister_ioctl32_conversion(DIOGDUMPDEV);
+ ret |= unregister_ioctl32_conversion(DIOSDUMPLEVEL);
+ ret |= unregister_ioctl32_conversion(DIOGDUMPLEVEL);
+ ret |= unregister_ioctl32_conversion(DIOSDUMPFLAGS);
+ ret |= unregister_ioctl32_conversion(DIOGDUMPFLAGS);
+ ret |= unregister_ioctl32_conversion(DIOSDUMPCOMPRESS);
+ ret |= unregister_ioctl32_conversion(DIOGDUMPCOMPRESS);
+ ret |= unregister_ioctl32_conversion(DIOSTARGETIP);
+ ret |= unregister_ioctl32_conversion(DIOGTARGETIP);
+ ret |= unregister_ioctl32_conversion(DIOSTARGETPORT);
+ ret |= unregister_ioctl32_conversion(DIOGTARGETPORT);
+ ret |= unregister_ioctl32_conversion(DIOSSOURCEPORT);
+ ret |= unregister_ioctl32_conversion(DIOGSOURCEPORT);
+ ret |= unregister_ioctl32_conversion(DIOSETHADDR);
+ ret |= unregister_ioctl32_conversion(DIOGETHADDR);
+ ret |= unregister_ioctl32_conversion(DIOGDUMPOKAY);
+ ret |= unregister_ioctl32_conversion(DIOSDUMPTAKE);
+ if (ret) {
+ printk(KERN_ERR "LKCD: Unregistering ioctl32 translations failed\n");
+ }
+ free_dha_stack();
+}
+
+/*
+ * Kludge - dump from interrupt context is unreliable (Fixme)
+ *
+ * We do this so that softirqs initiated for dump i/o
+ * get processed and we don't hang while waiting for i/o
+ * to complete or in any irq synchronization attempt.
+ *
+ * This is not quite legal of course, as it has the side
+ * effect of making all interrupts & softirqs triggered
+ * while dump is in progress complete before currently
+ * pending softirqs and the currently executing interrupt
+ * code.
+ */
+static inline void
+irq_bh_save(void)
+{
+ saved_irq_count = irq_count();
+ preempt_count() &= ~(HARDIRQ_MASK|SOFTIRQ_MASK);
+}
+
+static inline void
+irq_bh_restore(void)
+{
+ preempt_count() |= saved_irq_count;
+}
+
+/*
+ * Name: __dump_irq_enable
+ * Func: Reset system so interrupts are enabled.
+ * This is used for dump methods that require interrupts
+ * Eventually, all methods will have interrupts disabled
+ * and this code can be removed.
+ *
+ * Change irq affinities
+ * Re-enable interrupts
+ */
+int
+__dump_irq_enable(void)
+{
+ __dump_set_irq_affinity();
+ irq_bh_save();
+ local_irq_enable();
+ return 0;
+}
+
+/*
+ * Name: __dump_irq_restore
+ * Func: Resume the system state in an architecture-specific way.
+ */
+void
+__dump_irq_restore(void)
+{
+ local_irq_disable();
+ __dump_reset_irq_affinity();
+ irq_bh_restore();
+}
+
+#if 0
+/* Cheap progress hack. It estimates pages to write and
+ * assumes all pages will go -- so it may get way off.
+ * As the progress is not displayed for other architectures, not used at this
+ * moment.
+ */
+void
+__dump_progress_add_page(void)
+{
+ unsigned long total_pages = nr_free_pages() + nr_inactive_pages + nr_active_pages;
+ unsigned int percent = (dump_header.dh_num_dump_pages * 100) / total_pages;
+ char buf[30];
+
+ if (percent > last_percent && percent <= 100) {
+ sprintf(buf, "Dump %3d%% ", percent);
+ ppc64_dump_msg(0x2, buf);
+ last_percent = percent;
+ }
+
+}
+#endif
+
+extern int dump_page_is_ram(unsigned long);
+/*
+ * Name: __dump_page_valid()
+ * Func: Check if page is valid to dump.
+ */
+int
+__dump_page_valid(unsigned long index)
+{
+ if (!pfn_valid(index))
+ return 0;
+
+ return dump_page_is_ram(index);
+}
+
+/*
+ * Name: manual_handle_crashdump()
+ * Func: Interface for the lkcd dump command. Calls dump_execute()
+ */
+int
+manual_handle_crashdump(void)
+{
+ struct pt_regs regs;
+
+ get_current_regs(®s);
+ dump_execute("manual", ®s);
+ return 0;
+}
--- /dev/null
+/*
+ * RLE Compression functions for kernel crash dumps.
+ *
+ * Created by: Matt Robinson (yakker@sourceforge.net)
+ * Copyright 2001 Matt D. Robinson. All rights reserved.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/* header files */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/init.h>
+#include <linux/dump.h>
+
+/*
+ * Name: dump_compress_rle()
+ * Func: Compress a DUMP_PAGE_SIZE (hardware) page down to something more
+ * reasonable, if possible. This is the same routine we use in IRIX.
+ */
+static u16
+dump_compress_rle(const u8 *old, u16 oldsize, u8 *new, u16 newsize)
+{
+ u16 ri, wi, count = 0;
+ u_char value = 0, cur_byte;
+
+ /*
+ * If the block should happen to "compress" to larger than the
+ * buffer size, allocate a larger one and change cur_buf_size.
+ */
+
+ wi = ri = 0;
+
+ while (ri < oldsize) {
+ if (!ri) {
+ cur_byte = value = old[ri];
+ count = 0;
+ } else {
+ if (count == 255) {
+ if (wi + 3 > oldsize) {
+ return oldsize;
+ }
+ new[wi++] = 0;
+ new[wi++] = count;
+ new[wi++] = value;
+ value = cur_byte = old[ri];
+ count = 0;
+ } else {
+ if ((cur_byte = old[ri]) == value) {
+ count++;
+ } else {
+ if (count > 1) {
+ if (wi + 3 > oldsize) {
+ return oldsize;
+ }
+ new[wi++] = 0;
+ new[wi++] = count;
+ new[wi++] = value;
+ } else if (count == 1) {
+ if (value == 0) {
+ if (wi + 3 > oldsize) {
+ return oldsize;
+ }
+ new[wi++] = 0;
+ new[wi++] = 1;
+ new[wi++] = 0;
+ } else {
+ if (wi + 2 > oldsize) {
+ return oldsize;
+ }
+ new[wi++] = value;
+ new[wi++] = value;
+ }
+ } else { /* count == 0 */
+ if (value == 0) {
+ if (wi + 2 > oldsize) {
+ return oldsize;
+ }
+ new[wi++] = value;
+ new[wi++] = value;
+ } else {
+ if (wi + 1 > oldsize) {
+ return oldsize;
+ }
+ new[wi++] = value;
+ }
+ } /* if count > 1 */
+
+ value = cur_byte;
+ count = 0;
+
+ } /* if byte == value */
+
+ } /* if count == 255 */
+
+ } /* if ri == 0 */
+ ri++;
+
+ }
+ if (count > 1) {
+ if (wi + 3 > oldsize) {
+ return oldsize;
+ }
+ new[wi++] = 0;
+ new[wi++] = count;
+ new[wi++] = value;
+ } else if (count == 1) {
+ if (value == 0) {
+ if (wi + 3 > oldsize)
+ return oldsize;
+ new[wi++] = 0;
+ new[wi++] = 1;
+ new[wi++] = 0;
+ } else {
+ if (wi + 2 > oldsize)
+ return oldsize;
+ new[wi++] = value;
+ new[wi++] = value;
+ }
+ } else { /* count == 0 */
+ if (value == 0) {
+ if (wi + 2 > oldsize)
+ return oldsize;
+ new[wi++] = value;
+ new[wi++] = value;
+ } else {
+ if (wi + 1 > oldsize)
+ return oldsize;
+ new[wi++] = value;
+ }
+ } /* if count > 1 */
+
+ value = cur_byte;
+ count = 0;
+ return wi;
+}
+
+/* setup the rle compression functionality */
+static struct __dump_compress dump_rle_compression = {
+ .compress_type = DUMP_COMPRESS_RLE,
+ .compress_func = dump_compress_rle,
+ .compress_name = "RLE",
+};
+
+/*
+ * Name: dump_compress_rle_init()
+ * Func: Initialize rle compression for dumping.
+ */
+static int __init
+dump_compress_rle_init(void)
+{
+ dump_register_compression(&dump_rle_compression);
+ return 0;
+}
+
+/*
+ * Name: dump_compress_rle_cleanup()
+ * Func: Remove rle compression for dumping.
+ */
+static void __exit
+dump_compress_rle_cleanup(void)
+{
+ dump_unregister_compression(DUMP_COMPRESS_RLE);
+}
+
+/* module initialization */
+module_init(dump_compress_rle_init);
+module_exit(dump_compress_rle_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("LKCD Development Team <lkcd-devel@lists.sourceforge.net>");
+MODULE_DESCRIPTION("RLE compression module for crash dump driver");
--- /dev/null
+/*
+ * Default single stage dump scheme methods
+ *
+ * Previously a part of dump_base.c
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya <suparna@in.ibm.com>
+ * Split and rewrote LKCD dump scheme to generic dump method
+ * interfaces
+ * Derived from original code created by
+ * Matt Robinson <yakker@sourceforge.net>)
+ *
+ * Contributions from SGI, IBM, HP, MCL, and others.
+ *
+ * Copyright (C) 1999 - 2002 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/*
+ * Implements the default dump scheme, i.e. single-stage gathering and
+ * saving of dump data directly to the target device, which operates in
+ * a push mode, where the dumping system decides what data it saves
+ * taking into account pre-specified dump config options.
+ *
+ * Aside: The 2-stage dump scheme, where there is a soft-reset between
+ * the gathering and saving phases, also reuses some of these
+ * default routines (see dump_overlay.c)
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/nmi.h>
+#include <linux/dump.h>
+#include "dump_methods.h"
+
+extern int panic_timeout; /* time before reboot */
+
+extern void dump_speedo(int);
+
+/* Default sequencer used during single stage dumping */
+/* Also invoked during stage 2 of soft-boot based dumping */
+int dump_generic_sequencer(void)
+{
+ struct dump_data_filter *filter = dump_config.dumper->filter;
+ int pass = 0, err = 0, save = 0;
+ int (*action)(unsigned long, unsigned long);
+
+ /*
+ * We want to save the more critical data areas first in
+ * case we run out of space, encounter i/o failures, or get
+ * interrupted otherwise and have to give up midway
+ * So, run through the passes in increasing order
+ */
+ for (;filter->selector; filter++, pass++)
+ {
+ /* Assumes passes are exclusive (even across dumpers) */
+ /* Requires care when coding the selection functions */
+ if ((save = filter->level_mask & dump_config.level))
+ action = dump_save_data;
+ else
+ action = dump_skip_data;
+
+ if ((err = dump_iterator(pass, action, filter)) < 0)
+ break;
+
+ printk("\n %d dump pages %s of %d each in pass %d\n",
+ err, save ? "saved" : "skipped", DUMP_PAGE_SIZE, pass);
+
+ }
+
+ return (err < 0) ? err : 0;
+}
+
+static inline struct page *dump_get_page(loff_t loc)
+{
+
+ unsigned long page_index = loc >> PAGE_SHIFT;
+
+ /* todo: complete this to account for ia64/discontig mem */
+ /* todo: and to check for validity, ram page, no i/o mem etc */
+ /* need to use pfn/physaddr equiv of kern_addr_valid */
+
+ /* Important:
+ * On ARM/XScale system, the physical address starts from
+ * PHYS_OFFSET, and it maybe the situation that PHYS_OFFSET != 0.
+ * For example on Intel's PXA250, PHYS_OFFSET = 0xa0000000. And the
+ * page index starts from PHYS_PFN_OFFSET. When configuring
+ * filter, filter->start is assigned to 0 in dump_generic_configure.
+ * Here we want to adjust it by adding PHYS_PFN_OFFSET to it!
+ */
+#ifdef CONFIG_ARM
+ page_index += PHYS_PFN_OFFSET;
+#endif
+ if (__dump_page_valid(page_index))
+ return pfn_to_page(page_index);
+ else
+ return NULL;
+
+}
+
+/* Default iterator: for singlestage and stage 1 of soft-boot dumping */
+/* Iterates over range of physical memory pages in DUMP_PAGE_SIZE increments */
+int dump_page_iterator(int pass, int (*action)(unsigned long, unsigned long),
+ struct dump_data_filter *filter)
+{
+ /* Todo : fix unit, type */
+ loff_t loc, start, end;
+ int i, count = 0, err = 0;
+ struct page *page;
+
+ /* Todo: Add membanks code */
+ /* TBD: Check if we need to address DUMP_PAGE_SIZE < PAGE_SIZE */
+
+ for (i = 0; i < filter->num_mbanks; i++) {
+ start = filter->start[i];
+ end = filter->end[i];
+ for (loc = start; loc < end; loc += DUMP_PAGE_SIZE) {
+ dump_config.dumper->curr_loc = loc;
+ page = dump_get_page(loc);
+ if (page && filter->selector(pass,
+ (unsigned long) page, DUMP_PAGE_SIZE)) {
+ if ((err = action((unsigned long)page,
+ DUMP_PAGE_SIZE))) {
+ printk("dump_page_iterator: err %d for "
+ "loc 0x%llx, in pass %d\n",
+ err, loc, pass);
+ return err ? err : count;
+ } else
+ count++;
+ }
+ }
+ }
+
+ return err ? err : count;
+}
+
+/*
+ * Base function that saves the selected block of data in the dump
+ * Action taken when iterator decides that data needs to be saved
+ */
+int dump_generic_save_data(unsigned long loc, unsigned long sz)
+{
+ void *buf;
+ void *dump_buf = dump_config.dumper->dump_buf;
+ int left, bytes, ret;
+
+ if ((ret = dump_add_data(loc, sz))) {
+ return ret;
+ }
+ buf = dump_config.dumper->curr_buf;
+
+ /* If we've filled up the buffer write it out */
+ if ((left = buf - dump_buf) >= DUMP_BUFFER_SIZE) {
+ bytes = dump_write_buffer(dump_buf, DUMP_BUFFER_SIZE);
+ if (bytes < DUMP_BUFFER_SIZE) {
+ printk("dump_write_buffer failed %d\n", bytes);
+ return bytes ? -ENOSPC : bytes;
+ }
+
+ left -= bytes;
+
+ /* -- A few chores to do from time to time -- */
+ dump_config.dumper->count++;
+
+ if (!(dump_config.dumper->count & 0x3f)) {
+ /* Update the header every one in a while */
+ memset((void *)dump_buf, 'b', DUMP_BUFFER_SIZE);
+ if ((ret = dump_update_header()) < 0) {
+ /* issue warning */
+ return ret;
+ }
+ printk(".");
+
+ touch_nmi_watchdog();
+ } else if (!(dump_config.dumper->count & 0x7)) {
+ /* Show progress so the user knows we aren't hung */
+ dump_speedo(dump_config.dumper->count >> 3);
+ }
+ /* Todo: Touch/Refresh watchdog */
+
+ /* --- Done with periodic chores -- */
+
+ /*
+ * extra bit of copying to simplify verification
+ * in the second kernel boot based scheme
+ */
+ memcpy(dump_buf - DUMP_PAGE_SIZE, dump_buf +
+ DUMP_BUFFER_SIZE - DUMP_PAGE_SIZE, DUMP_PAGE_SIZE);
+
+ /* now adjust the leftover bits back to the top of the page */
+ /* this case would not arise during stage 2 (passthru) */
+ memset(dump_buf, 'z', DUMP_BUFFER_SIZE);
+ if (left) {
+ memcpy(dump_buf, dump_buf + DUMP_BUFFER_SIZE, left);
+ }
+ buf -= DUMP_BUFFER_SIZE;
+ dump_config.dumper->curr_buf = buf;
+ }
+
+ return 0;
+}
+
+int dump_generic_skip_data(unsigned long loc, unsigned long sz)
+{
+ /* dummy by default */
+ return 0;
+}
+
+/*
+ * Common low level routine to write a buffer to current dump device
+ * Expects checks for space etc to have been taken care of by the caller
+ * Operates serially at the moment for simplicity.
+ * TBD/Todo: Consider batching for improved throughput
+ */
+int dump_ll_write(void *buf, unsigned long len)
+{
+ long transferred = 0, last_transfer = 0;
+ int ret = 0;
+
+ /* make sure device is ready */
+ while ((ret = dump_dev_ready(NULL)) == -EAGAIN);
+ if (ret < 0) {
+ printk("dump_dev_ready failed !err %d\n", ret);
+ return ret;
+ }
+
+ while (len) {
+ if ((last_transfer = dump_dev_write(buf, len)) <= 0) {
+ ret = last_transfer;
+ printk("dump_dev_write failed !err %d\n",
+ ret);
+ break;
+ }
+ /* wait till complete */
+ while ((ret = dump_dev_ready(buf)) == -EAGAIN)
+ cpu_relax();
+
+ if (ret < 0) {
+ printk("i/o failed !err %d\n", ret);
+ break;
+ }
+
+ len -= last_transfer;
+ buf += last_transfer;
+ transferred += last_transfer;
+ }
+ return (ret < 0) ? ret : transferred;
+}
+
+/* default writeout routine for single dump device */
+/* writes out the dump data ensuring enough space is left for the end marker */
+int dump_generic_write_buffer(void *buf, unsigned long len)
+{
+ long written = 0;
+ int err = 0;
+
+ /* check for space */
+ if ((err = dump_dev_seek(dump_config.dumper->curr_offset + len +
+ 2*DUMP_BUFFER_SIZE)) < 0) {
+ printk("dump_write_buffer: insuff space after offset 0x%llx\n",
+ dump_config.dumper->curr_offset);
+ return err;
+ }
+ /* alignment check would happen as a side effect of this */
+ if ((err = dump_dev_seek(dump_config.dumper->curr_offset)) < 0)
+ return err;
+
+ written = dump_ll_write(buf, len);
+
+ /* all or none */
+
+ if (written < len)
+ written = written ? -ENOSPC : written;
+ else
+ dump_config.dumper->curr_offset += len;
+
+ return written;
+}
+
+int dump_generic_configure(unsigned long devid)
+{
+ struct dump_dev *dev = dump_config.dumper->dev;
+ struct dump_data_filter *filter;
+ void *buf;
+ int ret = 0;
+
+ /* Allocate the dump buffer and initialize dumper state */
+ /* Assume that we get aligned addresses */
+ if (!(buf = dump_alloc_mem(DUMP_BUFFER_SIZE + 3 * DUMP_PAGE_SIZE)))
+ return -ENOMEM;
+
+ if ((unsigned long)buf & (PAGE_SIZE - 1)) {
+ /* sanity check for page aligned address */
+ dump_free_mem(buf);
+ return -ENOMEM; /* fixme: better error code */
+ }
+
+ /* Initialize the rest of the fields */
+ dump_config.dumper->dump_buf = buf + DUMP_PAGE_SIZE;
+ dumper_reset();
+
+ /* Open the dump device */
+ if (!dev)
+ return -ENODEV;
+
+ if ((ret = dev->ops->open(dev, devid))) {
+ return ret;
+ }
+
+ /* Initialise the memory ranges in the dump filter */
+ for (filter = dump_config.dumper->filter ;filter->selector; filter++) {
+ if (!filter->start[0] && !filter->end[0]) {
+ pg_data_t *pgdat;
+ int i = 0;
+ for_each_pgdat(pgdat) {
+ filter->start[i] =
+ (loff_t)pgdat->node_start_pfn << PAGE_SHIFT;
+ filter->end[i] =
+ (loff_t)(pgdat->node_start_pfn + pgdat->node_spanned_pages) << PAGE_SHIFT;
+ i++;
+ }
+ filter->num_mbanks = i;
+ }
+ }
+
+ return 0;
+}
+
+int dump_generic_unconfigure(void)
+{
+ struct dump_dev *dev = dump_config.dumper->dev;
+ void *buf = dump_config.dumper->dump_buf;
+ int ret = 0;
+
+ pr_debug("Generic unconfigure\n");
+ /* Close the dump device */
+ if (dev && (ret = dev->ops->release(dev)))
+ return ret;
+
+ printk("Closed dump device\n");
+
+ if (buf)
+ dump_free_mem((buf - DUMP_PAGE_SIZE));
+
+ dump_config.dumper->curr_buf = dump_config.dumper->dump_buf = NULL;
+ pr_debug("Released dump buffer\n");
+
+ return 0;
+}
+
+
+/* Set up the default dump scheme */
+
+struct dump_scheme_ops dump_scheme_singlestage_ops = {
+ .configure = dump_generic_configure,
+ .unconfigure = dump_generic_unconfigure,
+ .sequencer = dump_generic_sequencer,
+ .iterator = dump_page_iterator,
+ .save_data = dump_generic_save_data,
+ .skip_data = dump_generic_skip_data,
+ .write_buffer = dump_generic_write_buffer,
+};
+
+struct dump_scheme dump_scheme_singlestage = {
+ .name = "single-stage",
+ .ops = &dump_scheme_singlestage_ops
+};
+
+/* The single stage dumper comprising all these */
+struct dumper dumper_singlestage = {
+ .name = "single-stage",
+ .scheme = &dump_scheme_singlestage,
+ .fmt = &dump_fmt_lcrash,
+ .compress = &dump_none_compression,
+ .filter = dump_filter_table,
+ .dev = NULL,
+};
+
--- /dev/null
+/*
+ * Standard kernel function entry points for Linux crash dumps.
+ *
+ * Created by: Matt Robinson (yakker@sourceforge.net)
+ * Contributions from SGI, IBM, HP, MCL, and others.
+ *
+ * Copyright (C) 1999 - 2002 Silicon Graphics, Inc. All rights reserved.
+ * Copyright (C) 2000 - 2002 TurboLinux, Inc. All rights reserved.
+ * Copyright (C) 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 Free Software Foundation, Inc. All rights reserved.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/*
+ * -----------------------------------------------------------------------
+ *
+ * DUMP HISTORY
+ *
+ * This dump code goes back to SGI's first attempts at dumping system
+ * memory on SGI systems running IRIX. A few developers at SGI needed
+ * a way to take this system dump and analyze it, and created 'icrash',
+ * or IRIX Crash. The mechanism (the dumps and 'icrash') were used
+ * by support people to generate crash reports when a system failure
+ * occurred. This was vital for large system configurations that
+ * couldn't apply patch after patch after fix just to hope that the
+ * problems would go away. So the system memory, along with the crash
+ * dump analyzer, allowed support people to quickly figure out what the
+ * problem was on the system with the crash dump.
+ *
+ * In comes Linux. SGI started moving towards the open source community,
+ * and upon doing so, SGI wanted to take its support utilities into Linux
+ * with the hopes that they would end up the in kernel and user space to
+ * be used by SGI's customers buying SGI Linux systems. One of the first
+ * few products to be open sourced by SGI was LKCD, or Linux Kernel Crash
+ * Dumps. LKCD comprises of a patch to the kernel to enable system
+ * dumping, along with 'lcrash', or Linux Crash, to analyze the system
+ * memory dump. A few additional system scripts and kernel modifications
+ * are also included to make the dump mechanism and dump data easier to
+ * process and use.
+ *
+ * As soon as LKCD was released into the open source community, a number
+ * of larger companies started to take advantage of it. Today, there are
+ * many community members that contribute to LKCD, and it continues to
+ * flourish and grow as an open source project.
+ */
+
+/*
+ * DUMP TUNABLES
+ *
+ * This is the list of system tunables (via /proc) that are available
+ * for Linux systems. All the read, write, etc., functions are listed
+ * here. Currently, there are a few different tunables for dumps:
+ *
+ * dump_device (used to be dumpdev):
+ * The device for dumping the memory pages out to. This
+ * may be set to the primary swap partition for disruptive dumps,
+ * and must be an unused partition for non-disruptive dumps.
+ * Todo: In the case of network dumps, this may be interpreted
+ * as the IP address of the netdump server to connect to.
+ *
+ * dump_compress (used to be dump_compress_pages):
+ * This is the flag which indicates which compression mechanism
+ * to use. This is a BITMASK, not an index (0,1,2,4,8,16,etc.).
+ * This is the current set of values:
+ *
+ * 0: DUMP_COMPRESS_NONE -- Don't compress any pages.
+ * 1: DUMP_COMPRESS_RLE -- This uses RLE compression.
+ * 2: DUMP_COMPRESS_GZIP -- This uses GZIP compression.
+ *
+ * dump_level:
+ * The amount of effort the dump module should make to save
+ * information for post crash analysis. This value is now
+ * a BITMASK value, not an index:
+ *
+ * 0: Do nothing, no dumping. (DUMP_LEVEL_NONE)
+ *
+ * 1: Print out the dump information to the dump header, and
+ * write it out to the dump_device. (DUMP_LEVEL_HEADER)
+ *
+ * 2: Write out the dump header and all kernel memory pages.
+ * (DUMP_LEVEL_KERN)
+ *
+ * 4: Write out the dump header and all kernel and user
+ * memory pages. (DUMP_LEVEL_USED)
+ *
+ * 8: Write out the dump header and all conventional/cached
+ * memory (RAM) pages in the system (kernel, user, free).
+ * (DUMP_LEVEL_ALL_RAM)
+ *
+ * 16: Write out everything, including non-conventional memory
+ * like firmware, proms, I/O registers, uncached memory.
+ * (DUMP_LEVEL_ALL)
+ *
+ * The dump_level will default to 1.
+ *
+ * dump_flags:
+ * These are the flags to use when talking about dumps. There
+ * are lots of possibilities. This is a BITMASK value, not an index.
+ *
+ * -----------------------------------------------------------------------
+ */
+
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/fs.h>
+#include <linux/dump.h>
+#include "dump_methods.h"
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/utsname.h>
+#include <linux/highmem.h>
+#include <linux/miscdevice.h>
+#include <linux/sysrq.h>
+#include <linux/sysctl.h>
+#include <linux/nmi.h>
+#include <linux/init.h>
+
+#include <asm/hardirq.h>
+#include <asm/uaccess.h>
+
+/*
+ * -----------------------------------------------------------------------
+ * V A R I A B L E S
+ * -----------------------------------------------------------------------
+ */
+
+/* Dump tunables */
+struct dump_config dump_config = {
+ .level = 0,
+ .flags = 0,
+ .dump_device = 0,
+ .dump_addr = 0,
+ .dumper = NULL
+};
+#ifdef CONFIG_ARM
+static _dump_regs_t all_regs;
+#endif
+
+/* Global variables used in dump.h */
+/* degree of system freeze when dumping */
+enum dump_silence_levels dump_silence_level = DUMP_HARD_SPIN_CPUS;
+
+/* Other global fields */
+extern struct __dump_header dump_header;
+struct dump_dev *dump_dev = NULL; /* Active dump device */
+static int dump_compress = 0;
+
+static u16 dump_compress_none(const u8 *old, u16 oldsize, u8 *new, u16 newsize);
+struct __dump_compress dump_none_compression = {
+ .compress_type = DUMP_COMPRESS_NONE,
+ .compress_func = dump_compress_none,
+ .compress_name = "none",
+};
+
+/* our device operations and functions */
+static int dump_ioctl(struct inode *i, struct file *f,
+ unsigned int cmd, unsigned long arg);
+
+static struct file_operations dump_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = dump_ioctl,
+};
+
+static struct miscdevice dump_miscdev = {
+ .minor = CRASH_DUMP_MINOR,
+ .name = "dump",
+ .fops = &dump_fops,
+};
+MODULE_ALIAS_MISCDEV(CRASH_DUMP_MINOR);
+
+/* static variables */
+static int dump_okay = 0; /* can we dump out to disk? */
+static spinlock_t dump_lock = SPIN_LOCK_UNLOCKED;
+
+/* used for dump compressors */
+static struct list_head dump_compress_list = LIST_HEAD_INIT(dump_compress_list);
+
+/* list of registered dump targets */
+static struct list_head dump_target_list = LIST_HEAD_INIT(dump_target_list);
+
+/* lkcd info structure -- this is used by lcrash for basic system data */
+struct __lkcdinfo lkcdinfo = {
+ .ptrsz = (sizeof(void *) * 8),
+#if defined(__LITTLE_ENDIAN)
+ .byte_order = __LITTLE_ENDIAN,
+#else
+ .byte_order = __BIG_ENDIAN,
+#endif
+ .page_shift = PAGE_SHIFT,
+ .page_size = PAGE_SIZE,
+ .page_mask = PAGE_MASK,
+ .page_offset = PAGE_OFFSET,
+};
+
+/*
+ * -----------------------------------------------------------------------
+ * / P R O C T U N A B L E F U N C T I O N S
+ * -----------------------------------------------------------------------
+ */
+
+static int proc_dump_device(ctl_table *ctl, int write, struct file *f,
+ void *buffer, size_t *lenp);
+
+static int proc_doulonghex(ctl_table *ctl, int write, struct file *f,
+ void *buffer, size_t *lenp);
+/*
+ * sysctl-tuning infrastructure.
+ */
+static ctl_table dump_table[] = {
+ { .ctl_name = CTL_DUMP_LEVEL,
+ .procname = DUMP_LEVEL_NAME,
+ .data = &dump_config.level,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_doulonghex, },
+
+ { .ctl_name = CTL_DUMP_FLAGS,
+ .procname = DUMP_FLAGS_NAME,
+ .data = &dump_config.flags,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_doulonghex, },
+
+ { .ctl_name = CTL_DUMP_COMPRESS,
+ .procname = DUMP_COMPRESS_NAME,
+ .data = &dump_compress, /* FIXME */
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec, },
+
+ { .ctl_name = CTL_DUMP_DEVICE,
+ .procname = DUMP_DEVICE_NAME,
+ .mode = 0644,
+ .data = &dump_config.dump_device, /* FIXME */
+ .maxlen = sizeof(int),
+ .proc_handler = proc_dump_device },
+
+#ifdef CONFIG_CRASH_DUMP_MEMDEV
+ { .ctl_name = CTL_DUMP_ADDR,
+ .procname = DUMP_ADDR_NAME,
+ .mode = 0444,
+ .data = &dump_config.dump_addr,
+ .maxlen = sizeof(unsigned long),
+ .proc_handler = proc_doulonghex },
+#endif
+
+ { 0, }
+};
+
+static ctl_table dump_root[] = {
+ { .ctl_name = KERN_DUMP,
+ .procname = "dump",
+ .mode = 0555,
+ .child = dump_table },
+ { 0, }
+};
+
+static ctl_table kernel_root[] = {
+ { .ctl_name = CTL_KERN,
+ .procname = "kernel",
+ .mode = 0555,
+ .child = dump_root, },
+ { 0, }
+};
+
+static struct ctl_table_header *sysctl_header;
+
+/*
+ * -----------------------------------------------------------------------
+ * C O M P R E S S I O N F U N C T I O N S
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * Name: dump_compress_none()
+ * Func: Don't do any compression, period.
+ */
+static u16
+dump_compress_none(const u8 *old, u16 oldsize, u8 *new, u16 newsize)
+{
+ /* just return the old size */
+ return oldsize;
+}
+
+
+/*
+ * Name: dump_execute()
+ * Func: Execute the dumping process. This makes sure all the appropriate
+ * fields are updated correctly, and calls dump_execute_memdump(),
+ * which does the real work.
+ */
+void
+dump_execute(const char *panic_str, const struct pt_regs *regs)
+{
+ int state = -1;
+ unsigned long flags;
+
+ /* make sure we can dump */
+ if (!dump_okay) {
+ pr_info("LKCD not yet configured, can't take dump now\n");
+ return;
+ }
+
+ /* Exclude multiple dumps at the same time,
+ * and disable interrupts, some drivers may re-enable
+ * interrupts in with silence()
+ *
+ * Try and acquire spin lock. If successful, leave preempt
+ * and interrupts disabled. See spin_lock_irqsave in spinlock.h
+ */
+ local_irq_save(flags);
+ if (!spin_trylock(&dump_lock)) {
+ local_irq_restore(flags);
+ pr_info("LKCD dump already in progress\n");
+ return;
+ }
+
+ /* Bring system into the strictest level of quiescing for min drift
+ * dump drivers can soften this as required in dev->ops->silence()
+ */
+ dump_oncpu = smp_processor_id() + 1;
+ dump_silence_level = DUMP_HARD_SPIN_CPUS;
+
+ state = dump_generic_execute(panic_str, regs);
+
+ dump_oncpu = 0;
+ spin_unlock_irqrestore(&dump_lock, flags);
+
+ if (state < 0) {
+ printk("Dump Incomplete or failed!\n");
+ } else {
+ printk("Dump Complete; %d dump pages saved.\n",
+ dump_header.dh_num_dump_pages);
+ }
+}
+
+/*
+ * Name: dump_register_compression()
+ * Func: Register a dump compression mechanism.
+ */
+void
+dump_register_compression(struct __dump_compress *item)
+{
+ if (item)
+ list_add(&(item->list), &dump_compress_list);
+}
+
+/*
+ * Name: dump_unregister_compression()
+ * Func: Remove a dump compression mechanism, and re-assign the dump
+ * compression pointer if necessary.
+ */
+void
+dump_unregister_compression(int compression_type)
+{
+ struct list_head *tmp;
+ struct __dump_compress *dc;
+
+ /* let's make sure our list is valid */
+ if (compression_type != DUMP_COMPRESS_NONE) {
+ list_for_each(tmp, &dump_compress_list) {
+ dc = list_entry(tmp, struct __dump_compress, list);
+ if (dc->compress_type == compression_type) {
+ list_del(&(dc->list));
+ break;
+ }
+ }
+ }
+}
+
+/*
+ * Name: dump_compress_init()
+ * Func: Initialize (or re-initialize) compression scheme.
+ */
+static int
+dump_compress_init(int compression_type)
+{
+ struct list_head *tmp;
+ struct __dump_compress *dc;
+
+ /* try to remove the compression item */
+ list_for_each(tmp, &dump_compress_list) {
+ dc = list_entry(tmp, struct __dump_compress, list);
+ if (dc->compress_type == compression_type) {
+ dump_config.dumper->compress = dc;
+ dump_compress = compression_type;
+ pr_debug("Dump Compress %s\n", dc->compress_name);
+ return 0;
+ }
+ }
+
+ /*
+ * nothing on the list -- return ENODATA to indicate an error
+ *
+ * NB:
+ * EAGAIN: reports "Resource temporarily unavailable" which
+ * isn't very enlightening.
+ */
+ printk("compression_type:%d not found\n", compression_type);
+
+ return -ENODATA;
+}
+
+static int
+dumper_setup(unsigned long flags, unsigned long devid)
+{
+ int ret = 0;
+
+ /* unconfigure old dumper if it exists */
+ dump_okay = 0;
+ if (dump_config.dumper) {
+ pr_debug("Unconfiguring current dumper\n");
+ dump_unconfigure();
+ }
+ /* set up new dumper */
+ if (dump_config.flags & DUMP_FLAGS_SOFTBOOT) {
+ printk("Configuring softboot based dump \n");
+#ifdef CONFIG_CRASH_DUMP_MEMDEV
+ dump_config.dumper = &dumper_stage1;
+#else
+ printk("Requires CONFIG_CRASHDUMP_MEMDEV. Can't proceed.\n");
+ return -1;
+#endif
+ } else {
+ dump_config.dumper = &dumper_singlestage;
+ }
+ dump_config.dumper->dev = dump_dev;
+
+ ret = dump_configure(devid);
+ if (!ret) {
+ dump_okay = 1;
+ pr_debug("%s dumper set up for dev 0x%lx\n",
+ dump_config.dumper->name, devid);
+ dump_config.dump_device = devid;
+ } else {
+ printk("%s dumper set up failed for dev 0x%lx\n",
+ dump_config.dumper->name, devid);
+ dump_config.dumper = NULL;
+ }
+ return ret;
+}
+
+static int
+dump_target_init(int target)
+{
+ char type[20];
+ struct list_head *tmp;
+ struct dump_dev *dev;
+
+ switch (target) {
+ case DUMP_FLAGS_DISKDUMP:
+ strcpy(type, "blockdev"); break;
+ case DUMP_FLAGS_NETDUMP:
+ strcpy(type, "networkdev"); break;
+ default:
+ return -1;
+ }
+
+ /*
+ * This is a bit stupid, generating strings from flag
+ * and doing strcmp. This is done because 'struct dump_dev'
+ * has string 'type_name' and not interger 'type'.
+ */
+ list_for_each(tmp, &dump_target_list) {
+ dev = list_entry(tmp, struct dump_dev, list);
+ if (strcmp(type, dev->type_name) == 0) {
+ dump_dev = dev;
+ return 0;
+ }
+ }
+ return -1;
+}
+
+/*
+ * Name: dump_ioctl()
+ * Func: Allow all dump tunables through a standard ioctl() mechanism.
+ * This is far better than before, where we'd go through /proc,
+ * because now this will work for multiple OS and architectures.
+ */
+static int
+dump_ioctl(struct inode *i, struct file *f, unsigned int cmd, unsigned long arg)
+{
+ /* check capabilities */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!dump_config.dumper && cmd == DIOSDUMPCOMPRESS)
+ /* dump device must be configured first */
+ return -ENODEV;
+
+ /*
+ * This is the main mechanism for controlling get/set data
+ * for various dump device parameters. The real trick here
+ * is setting the dump device (DIOSDUMPDEV). That's what
+ * triggers everything else.
+ */
+ switch (cmd) {
+ case DIOSDUMPDEV: /* set dump_device */
+ pr_debug("Configuring dump device\n");
+ if (!(f->f_flags & O_RDWR))
+ return -EPERM;
+
+ __dump_open();
+ return dumper_setup(dump_config.flags, arg);
+
+
+ case DIOGDUMPDEV: /* get dump_device */
+ return put_user((long)dump_config.dump_device, (long *)arg);
+
+ case DIOSDUMPLEVEL: /* set dump_level */
+ if (!(f->f_flags & O_RDWR))
+ return -EPERM;
+
+ /* make sure we have a positive value */
+ if (arg < 0)
+ return -EINVAL;
+
+ /* Fixme: clean this up */
+ dump_config.level = 0;
+ switch ((int)arg) {
+ case DUMP_LEVEL_ALL:
+ case DUMP_LEVEL_ALL_RAM:
+ dump_config.level |= DUMP_MASK_UNUSED;
+ case DUMP_LEVEL_USED:
+ dump_config.level |= DUMP_MASK_USED;
+ case DUMP_LEVEL_KERN:
+ dump_config.level |= DUMP_MASK_KERN;
+ case DUMP_LEVEL_HEADER:
+ dump_config.level |= DUMP_MASK_HEADER;
+ case DUMP_LEVEL_NONE:
+ break;
+ default:
+ return (-EINVAL);
+ }
+ pr_debug("Dump Level 0x%lx\n", dump_config.level);
+ break;
+
+ case DIOGDUMPLEVEL: /* get dump_level */
+ /* fixme: handle conversion */
+ return put_user((long)dump_config.level, (long *)arg);
+
+
+ case DIOSDUMPFLAGS: /* set dump_flags */
+ /* check flags */
+ if (!(f->f_flags & O_RDWR))
+ return -EPERM;
+
+ /* make sure we have a positive value */
+ if (arg < 0)
+ return -EINVAL;
+
+ if (dump_target_init(arg & DUMP_FLAGS_TARGETMASK) < 0)
+ return -EINVAL; /* return proper error */
+
+ dump_config.flags = arg;
+
+ pr_debug("Dump Flags 0x%lx\n", dump_config.flags);
+ break;
+
+ case DIOGDUMPFLAGS: /* get dump_flags */
+ return put_user((long)dump_config.flags, (long *)arg);
+
+ case DIOSDUMPCOMPRESS: /* set the dump_compress status */
+ if (!(f->f_flags & O_RDWR))
+ return -EPERM;
+
+ return dump_compress_init((int)arg);
+
+ case DIOGDUMPCOMPRESS: /* get the dump_compress status */
+ return put_user((long)(dump_config.dumper ?
+ dump_config.dumper->compress->compress_type : 0),
+ (long *)arg);
+ case DIOGDUMPOKAY: /* check if dump is configured */
+ return put_user((long)dump_okay, (long *)arg);
+
+ case DIOSDUMPTAKE: /* Trigger a manual dump */
+ /* Do not proceed if lkcd not yet configured */
+ if(!dump_okay) {
+ printk("LKCD not yet configured. Cannot take manual dump\n");
+ return -ENODEV;
+ }
+
+ /* Take the dump */
+ return manual_handle_crashdump();
+
+ default:
+ /*
+ * these are network dump specific ioctls, let the
+ * module handle them.
+ */
+ return dump_dev_ioctl(cmd, arg);
+ }
+ return 0;
+}
+
+/*
+ * Handle special cases for dump_device
+ * changing dump device requires doing an opening the device
+ */
+static int
+proc_dump_device(ctl_table *ctl, int write, struct file *f,
+ void *buffer, size_t *lenp)
+{
+ int *valp = ctl->data;
+ int oval = *valp;
+ int ret = -EPERM;
+
+ /* same permission checks as ioctl */
+ if (capable(CAP_SYS_ADMIN)) {
+ ret = proc_doulonghex(ctl, write, f, buffer, lenp);
+ if (ret == 0 && write && *valp != oval) {
+ /* need to restore old value to close properly */
+ dump_config.dump_device = (dev_t) oval;
+ __dump_open();
+ ret = dumper_setup(dump_config.flags, (dev_t) *valp);
+ }
+ }
+
+ return ret;
+}
+
+/* All for the want of a proc_do_xxx routine which prints values in hex */
+static int
+proc_doulonghex(ctl_table *ctl, int write, struct file *f,
+ void *buffer, size_t *lenp)
+{
+#define TMPBUFLEN 20
+ unsigned long *i;
+ size_t len, left;
+ char buf[TMPBUFLEN];
+
+ if (!ctl->data || !ctl->maxlen || !*lenp || (f->f_pos)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ i = (unsigned long *) ctl->data;
+ left = *lenp;
+
+ sprintf(buf, "0x%lx\n", (*i));
+ len = strlen(buf);
+ if (len > left)
+ len = left;
+ if(copy_to_user(buffer, buf, len))
+ return -EFAULT;
+
+ left -= len;
+ *lenp -= left;
+ f->f_pos += *lenp;
+ return 0;
+}
+
+/*
+ * -----------------------------------------------------------------------
+ * I N I T F U N C T I O N S
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * These register and unregister routines are exported for modules
+ * to register their dump drivers (like block, net etc)
+ */
+int
+dump_register_device(struct dump_dev *ddev)
+{
+ struct list_head *tmp;
+ struct dump_dev *dev;
+
+ list_for_each(tmp, &dump_target_list) {
+ dev = list_entry(tmp, struct dump_dev, list);
+ if (strcmp(ddev->type_name, dev->type_name) == 0) {
+ printk("Target type %s already registered\n",
+ dev->type_name);
+ return -1; /* return proper error */
+ }
+ }
+ list_add(&(ddev->list), &dump_target_list);
+
+ return 0;
+}
+
+void
+dump_unregister_device(struct dump_dev *ddev)
+{
+ list_del(&(ddev->list));
+ if (ddev != dump_dev)
+ return;
+
+ dump_okay = 0;
+
+ if (dump_config.dumper)
+ dump_unconfigure();
+
+ dump_config.flags &= ~DUMP_FLAGS_TARGETMASK;
+ dump_okay = 0;
+ dump_dev = NULL;
+ dump_config.dumper = NULL;
+}
+
+static int panic_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+#ifdef CONFIG_ARM
+ get_current_general_regs(&all_regs);
+ get_current_cp14_regs(&all_regs);
+ get_current_cp15_regs(&all_regs);
+ dump_execute((const char *)ptr, &all_regs);
+#else
+ struct pt_regs regs;
+
+ get_current_regs(®s);
+ dump_execute((const char *)ptr, ®s);
+#endif
+ return 0;
+}
+
+extern struct notifier_block *panic_notifier_list;
+static int panic_event(struct notifier_block *, unsigned long, void *);
+static struct notifier_block panic_block = {
+ .notifier_call = panic_event,
+};
+
+#ifdef CONFIG_MAGIC_SYSRQ
+/* Sysrq handler */
+static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs,
+ struct tty_struct *tty) {
+ dump_execute("sysrq", pt_regs);
+}
+
+static struct sysrq_key_op sysrq_crashdump_op = {
+ .handler = sysrq_handle_crashdump,
+ .help_msg = "Dump",
+ .action_msg = "Starting crash dump",
+};
+#endif
+
+static inline void
+dump_sysrq_register(void)
+{
+#ifdef CONFIG_MAGIC_SYSRQ
+ __sysrq_lock_table();
+ __sysrq_put_key_op(DUMP_SYSRQ_KEY, &sysrq_crashdump_op);
+ __sysrq_unlock_table();
+#endif
+}
+
+static inline void
+dump_sysrq_unregister(void)
+{
+#ifdef CONFIG_MAGIC_SYSRQ
+ __sysrq_lock_table();
+ if (__sysrq_get_key_op(DUMP_SYSRQ_KEY) == &sysrq_crashdump_op)
+ __sysrq_put_key_op(DUMP_SYSRQ_KEY, NULL);
+ __sysrq_unlock_table();
+#endif
+}
+
+/*
+ * Name: dump_init()
+ * Func: Initialize the dump process. This will set up any architecture
+ * dependent code. The big key is we need the memory offsets before
+ * the page table is initialized, because the base memory offset
+ * is changed after paging_init() is called.
+ */
+static int __init
+dump_init(void)
+{
+ struct sysinfo info;
+ int err;
+
+ /* try to create our dump device */
+ err = misc_register(&dump_miscdev);
+ if (err) {
+ printk("cannot register dump character device!\n");
+ return err;
+ }
+
+ __dump_init((u64)PAGE_OFFSET);
+
+ /* set the dump_compression_list structure up */
+ dump_register_compression(&dump_none_compression);
+
+ /* grab the total memory size now (not if/when we crash) */
+ si_meminfo(&info);
+
+ /* set the memory size */
+ dump_header.dh_memory_size = (u64)info.totalram;
+
+ sysctl_header = register_sysctl_table(kernel_root, 0);
+ dump_sysrq_register();
+
+ notifier_chain_register(&panic_notifier_list, &panic_block);
+ dump_function_ptr = dump_execute;
+
+ pr_info("Crash dump driver initialized.\n");
+ return 0;
+}
+
+static void __exit
+dump_cleanup(void)
+{
+ dump_okay = 0;
+
+ if (dump_config.dumper)
+ dump_unconfigure();
+
+ /* arch-specific cleanup routine */
+ __dump_cleanup();
+
+ /* ignore errors while unregistering -- since can't do anything */
+ unregister_sysctl_table(sysctl_header);
+ misc_deregister(&dump_miscdev);
+ dump_sysrq_unregister();
+ notifier_chain_unregister(&panic_notifier_list, &panic_block);
+ dump_function_ptr = NULL;
+}
+
+EXPORT_SYMBOL(dump_register_compression);
+EXPORT_SYMBOL(dump_unregister_compression);
+EXPORT_SYMBOL(dump_register_device);
+EXPORT_SYMBOL(dump_unregister_device);
+EXPORT_SYMBOL(dump_config);
+EXPORT_SYMBOL(dump_silence_level);
+
+EXPORT_SYMBOL(__dump_irq_enable);
+EXPORT_SYMBOL(__dump_irq_restore);
+
+MODULE_AUTHOR("Matt D. Robinson <yakker@sourceforge.net>");
+MODULE_DESCRIPTION("Linux Kernel Crash Dump (LKCD) driver");
+MODULE_LICENSE("GPL");
+
+module_init(dump_init);
+module_exit(dump_cleanup);
--- /dev/null
+/*
+ * Kernel header file for Linux crash dumps.
+ *
+ * Created by: Matt Robinson (yakker@sgi.com)
+ *
+ * Copyright 1999 Silicon Graphics, Inc. All rights reserved.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/* This header file holds the architecture specific crash dump header */
+#ifndef _ASM_DUMP_H
+#define _ASM_DUMP_H
+
+/* necessary header files */
+#include <asm/ptrace.h>
+#include <asm/page.h>
+#include <linux/threads.h>
+#include <linux/mm.h>
+
+/* definitions */
+#define DUMP_ASM_MAGIC_NUMBER 0xdeaddeadULL /* magic number */
+#define DUMP_ASM_VERSION_NUMBER 0x3 /* version number */
+
+/* max number of cpus */
+#define DUMP_MAX_NUM_CPUS 32
+
+/*
+ * Structure: __dump_header_asm
+ * Function: This is the header for architecture-specific stuff. It
+ * follows right after the dump header.
+ */
+struct __dump_header_asm {
+ /* the dump magic number -- unique to verify dump is valid */
+ u64 dha_magic_number;
+
+ /* the version number of this dump */
+ u32 dha_version;
+
+ /* the size of this header (in case we can't read it) */
+ u32 dha_header_size;
+
+ /* the esp for i386 systems */
+ u32 dha_esp;
+
+ /* the eip for i386 systems */
+ u32 dha_eip;
+
+ /* the dump registers */
+ struct pt_regs dha_regs;
+
+ /* smp specific */
+ u32 dha_smp_num_cpus;
+ u32 dha_dumping_cpu;
+ struct pt_regs dha_smp_regs[DUMP_MAX_NUM_CPUS];
+ u32 dha_smp_current_task[DUMP_MAX_NUM_CPUS];
+ u32 dha_stack[DUMP_MAX_NUM_CPUS];
+ u32 dha_stack_ptr[DUMP_MAX_NUM_CPUS];
+} __attribute__((packed));
+
+#ifdef __KERNEL__
+
+extern struct __dump_header_asm dump_header_asm;
+
+#ifdef CONFIG_SMP
+extern cpumask_t irq_affinity[];
+extern int (*dump_ipi_function_ptr)(struct pt_regs *);
+extern void dump_send_ipi(void);
+#else
+#define dump_send_ipi() do { } while(0)
+#endif
+
+static inline void get_current_regs(struct pt_regs *regs)
+{
+ __asm__ __volatile__("movl %%ebx,%0" : "=m"(regs->ebx));
+ __asm__ __volatile__("movl %%ecx,%0" : "=m"(regs->ecx));
+ __asm__ __volatile__("movl %%edx,%0" : "=m"(regs->edx));
+ __asm__ __volatile__("movl %%esi,%0" : "=m"(regs->esi));
+ __asm__ __volatile__("movl %%edi,%0" : "=m"(regs->edi));
+ __asm__ __volatile__("movl %%ebp,%0" : "=m"(regs->ebp));
+ __asm__ __volatile__("movl %%eax,%0" : "=m"(regs->eax));
+ __asm__ __volatile__("movl %%esp,%0" : "=m"(regs->esp));
+ __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(regs->xss));
+ __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(regs->xcs));
+ __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(regs->xds));
+ __asm__ __volatile__("movw %%es, %%ax;" :"=a"(regs->xes));
+ __asm__ __volatile__("pushfl; popl %0" :"=m"(regs->eflags));
+ regs->eip = (unsigned long)current_text_addr();
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_DUMP_H */
--- /dev/null
+/*
+ * Kernel header file for Linux crash dumps.
+ *
+ * Created by: Matt Robinson (yakker@sgi.com)
+ * Copyright 1999 - 2002 Silicon Graphics, Inc. All rights reserved.
+ *
+ * vmdump.h to dump.h by: Matt D. Robinson (yakker@sourceforge.net)
+ * Copyright 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 Free Software Foundation, Inc. All rights reserved.
+ *
+ * Most of this is the same old stuff from vmdump.h, except now we're
+ * actually a stand-alone driver plugged into the block layer interface,
+ * with the exception that we now allow for compression modes externally
+ * loaded (e.g., someone can come up with their own).
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+/* This header file includes all structure definitions for crash dumps. */
+#ifndef _DUMP_H
+#define _DUMP_H
+
+#if defined(CONFIG_CRASH_DUMP) || defined (CONFIG_CRASH_DUMP_MODULE)
+
+#include <linux/list.h>
+#include <linux/notifier.h>
+#include <linux/dumpdev.h>
+#include <asm/ioctl.h>
+
+/*
+ * Predefine default DUMP_PAGE constants, asm header may override.
+ *
+ * On ia64 discontinuous memory systems it's possible for the memory
+ * banks to stop at 2**12 page alignments, the smallest possible page
+ * size. But the system page size, PAGE_SIZE, is in fact larger.
+ */
+#define DUMP_PAGE_SHIFT PAGE_SHIFT
+#define DUMP_PAGE_MASK PAGE_MASK
+#define DUMP_PAGE_ALIGN(addr) PAGE_ALIGN(addr)
+#define DUMP_HEADER_OFFSET PAGE_SIZE
+
+#define OLDMINORBITS 8
+#define OLDMINORMASK ((1U << OLDMINORBITS) -1)
+
+/* keep DUMP_PAGE_SIZE constant to 4K = 1<<12
+ * it may be different from PAGE_SIZE then.
+ */
+#define DUMP_PAGE_SIZE 4096
+
+/*
+ * Predefined default memcpy() to use when copying memory to the dump buffer.
+ *
+ * On ia64 there is a heads up function that can be called to let the prom
+ * machine check monitor know that the current activity is risky and it should
+ * ignore the fault (nofault). In this case the ia64 header will redefine this
+ * macro to __dump_memcpy() and use it's arch specific version.
+ */
+#define DUMP_memcpy memcpy
+
+/* necessary header files */
+#include <asm/dump.h> /* for architecture-specific header */
+
+/*
+ * Size of the buffer that's used to hold:
+ *
+ * 1. the dump header (padded to fill the complete buffer)
+ * 2. the possibly compressed page headers and data
+ */
+#define DUMP_BUFFER_SIZE (64 * 1024) /* size of dump buffer */
+#define DUMP_HEADER_SIZE DUMP_BUFFER_SIZE
+
+/* standard header definitions */
+#define DUMP_MAGIC_NUMBER 0xa8190173618f23edULL /* dump magic number */
+#define DUMP_MAGIC_LIVE 0xa8190173618f23cdULL /* live magic number */
+#define DUMP_VERSION_NUMBER 0x8 /* dump version number */
+#define DUMP_PANIC_LEN 0x100 /* dump panic string length */
+
+/* dump levels - type specific stuff added later -- add as necessary */
+#define DUMP_LEVEL_NONE 0x0 /* no dumping at all -- just bail */
+#define DUMP_LEVEL_HEADER 0x1 /* kernel dump header only */
+#define DUMP_LEVEL_KERN 0x2 /* dump header and kernel pages */
+#define DUMP_LEVEL_USED 0x4 /* dump header, kernel/user pages */
+#define DUMP_LEVEL_ALL_RAM 0x8 /* dump header, all RAM pages */
+#define DUMP_LEVEL_ALL 0x10 /* dump all memory RAM and firmware */
+
+
+/* dump compression options -- add as necessary */
+#define DUMP_COMPRESS_NONE 0x0 /* don't compress this dump */
+#define DUMP_COMPRESS_RLE 0x1 /* use RLE compression */
+#define DUMP_COMPRESS_GZIP 0x2 /* use GZIP compression */
+
+/* dump flags - any dump-type specific flags -- add as necessary */
+#define DUMP_FLAGS_NONE 0x0 /* no flags are set for this dump */
+#define DUMP_FLAGS_SOFTBOOT 0x2 /* 2 stage soft-boot based dump */
+#define DUMP_FLAGS_NONDISRUPT 0X1 /* non-disruptive dumping */
+
+#define DUMP_FLAGS_TARGETMASK 0xf0000000 /* handle special case targets */
+#define DUMP_FLAGS_DISKDUMP 0x80000000 /* dump to local disk */
+#define DUMP_FLAGS_NETDUMP 0x40000000 /* dump over the network */
+
+/* dump header flags -- add as necessary */
+#define DUMP_DH_FLAGS_NONE 0x0 /* no flags set (error condition!) */
+#define DUMP_DH_RAW 0x1 /* raw page (no compression) */
+#define DUMP_DH_COMPRESSED 0x2 /* page is compressed */
+#define DUMP_DH_END 0x4 /* end marker on a full dump */
+#define DUMP_DH_TRUNCATED 0x8 /* dump is incomplete */
+#define DUMP_DH_TEST_PATTERN 0x10 /* dump page is a test pattern */
+#define DUMP_DH_NOT_USED 0x20 /* 1st bit not used in flags */
+
+/* names for various dump parameters in /proc/kernel */
+#define DUMP_ROOT_NAME "sys/dump"
+#define DUMP_DEVICE_NAME "device"
+#define DUMP_COMPRESS_NAME "compress"
+#define DUMP_LEVEL_NAME "level"
+#define DUMP_FLAGS_NAME "flags"
+#define DUMP_ADDR_NAME "addr"
+
+#define DUMP_SYSRQ_KEY 'd' /* key to use for MAGIC_SYSRQ key */
+
+/* CTL_DUMP names: */
+enum
+{
+ CTL_DUMP_DEVICE=1,
+ CTL_DUMP_COMPRESS=3,
+ CTL_DUMP_LEVEL=3,
+ CTL_DUMP_FLAGS=4,
+ CTL_DUMP_ADDR=5,
+ CTL_DUMP_TEST=6,
+};
+
+
+/* page size for gzip compression -- buffered slightly beyond hardware PAGE_SIZE used by DUMP */
+#define DUMP_DPC_PAGE_SIZE (DUMP_PAGE_SIZE + 512)
+
+/* dump ioctl() control options */
+#define DIOSDUMPDEV _IOW('p', 0xA0, unsigned int) /* set the dump device */
+#define DIOGDUMPDEV _IOR('p', 0xA1, unsigned int) /* get the dump device */
+#define DIOSDUMPLEVEL _IOW('p', 0xA2, unsigned int) /* set the dump level */
+#define DIOGDUMPLEVEL _IOR('p', 0xA3, unsigned int) /* get the dump level */
+#define DIOSDUMPFLAGS _IOW('p', 0xA4, unsigned int) /* set the dump flag parameters */
+#define DIOGDUMPFLAGS _IOR('p', 0xA5, unsigned int) /* get the dump flag parameters */
+#define DIOSDUMPCOMPRESS _IOW('p', 0xA6, unsigned int) /* set the dump compress level */
+#define DIOGDUMPCOMPRESS _IOR('p', 0xA7, unsigned int) /* get the dump compress level */
+
+/* these ioctls are used only by netdump module */
+#define DIOSTARGETIP _IOW('p', 0xA8, unsigned int) /* set the target m/c's ip */
+#define DIOGTARGETIP _IOR('p', 0xA9, unsigned int) /* get the target m/c's ip */
+#define DIOSTARGETPORT _IOW('p', 0xAA, unsigned int) /* set the target m/c's port */
+#define DIOGTARGETPORT _IOR('p', 0xAB, unsigned int) /* get the target m/c's port */
+#define DIOSSOURCEPORT _IOW('p', 0xAC, unsigned int) /* set the source m/c's port */
+#define DIOGSOURCEPORT _IOR('p', 0xAD, unsigned int) /* get the source m/c's port */
+#define DIOSETHADDR _IOW('p', 0xAE, unsigned int) /* set ethernet address */
+#define DIOGETHADDR _IOR('p', 0xAF, unsigned int) /* get ethernet address */
+#define DIOGDUMPOKAY _IOR('p', 0xB0, unsigned int) /* check if dump is configured */
+#define DIOSDUMPTAKE _IOW('p', 0xB1, unsigned int) /* Take a manual dump */
+
+/*
+ * Structure: __dump_header
+ * Function: This is the header dumped at the top of every valid crash
+ * dump.
+ */
+struct __dump_header {
+ /* the dump magic number -- unique to verify dump is valid */
+ u64 dh_magic_number;
+
+ /* the version number of this dump */
+ u32 dh_version;
+
+ /* the size of this header (in case we can't read it) */
+ u32 dh_header_size;
+
+ /* the level of this dump (just a header?) */
+ u32 dh_dump_level;
+
+ /*
+ * We assume dump_page_size to be 4K in every case.
+ * Store here the configurable system page size (4K, 8K, 16K, etc.)
+ */
+ u32 dh_page_size;
+
+ /* the size of all physical memory */
+ u64 dh_memory_size;
+
+ /* the start of physical memory */
+ u64 dh_memory_start;
+
+ /* the end of physical memory */
+ u64 dh_memory_end;
+
+ /* the number of hardware/physical pages in this dump specifically */
+ u32 dh_num_dump_pages;
+
+ /* the panic string, if available */
+ char dh_panic_string[DUMP_PANIC_LEN];
+
+ /* timeval depends on architecture, two long values */
+ struct {
+ u64 tv_sec;
+ u64 tv_usec;
+ } dh_time; /* the time of the system crash */
+
+ /* the NEW utsname (uname) information -- in character form */
+ /* we do this so we don't have to include utsname.h */
+ /* plus it helps us be more architecture independent */
+ /* now maybe one day soon they'll make the [65] a #define! */
+ char dh_utsname_sysname[65];
+ char dh_utsname_nodename[65];
+ char dh_utsname_release[65];
+ char dh_utsname_version[65];
+ char dh_utsname_machine[65];
+ char dh_utsname_domainname[65];
+
+ /* the address of current task (OLD = void *, NEW = u64) */
+ u64 dh_current_task;
+
+ /* what type of compression we're using in this dump (if any) */
+ u32 dh_dump_compress;
+
+ /* any additional flags */
+ u32 dh_dump_flags;
+
+ /* any additional flags */
+ u32 dh_dump_device;
+} __attribute__((packed));
+
+/*
+ * Structure: __dump_page
+ * Function: To act as the header associated to each physical page of
+ * memory saved in the system crash dump. This allows for
+ * easy reassembly of each crash dump page. The address bits
+ * are split to make things easier for 64-bit/32-bit system
+ * conversions.
+ *
+ * dp_byte_offset and dp_page_index are landmarks that are helpful when
+ * looking at a hex dump of /dev/vmdump,
+ */
+struct __dump_page {
+ /* the address of this dump page */
+ u64 dp_address;
+
+ /* the size of this dump page */
+ u32 dp_size;
+
+ /* flags (currently DUMP_COMPRESSED, DUMP_RAW or DUMP_END) */
+ u32 dp_flags;
+} __attribute__((packed));
+
+/*
+ * Structure: __lkcdinfo
+ * Function: This structure contains information needed for the lkcdutils
+ * package (particularly lcrash) to determine what information is
+ * associated to this kernel, specifically.
+ */
+struct __lkcdinfo {
+ int arch;
+ int ptrsz;
+ int byte_order;
+ int linux_release;
+ int page_shift;
+ int page_size;
+ u64 page_mask;
+ u64 page_offset;
+ int stack_offset;
+};
+
+#ifdef __KERNEL__
+
+/*
+ * Structure: __dump_compress
+ * Function: This is what an individual compression mechanism can use
+ * to plug in their own compression techniques. It's always
+ * best to build these as individual modules so that people
+ * can put in whatever they want.
+ */
+struct __dump_compress {
+ /* the list_head structure for list storage */
+ struct list_head list;
+
+ /* the type of compression to use (DUMP_COMPRESS_XXX) */
+ int compress_type;
+ const char *compress_name;
+
+ /* the compression function to call */
+ u16 (*compress_func)(const u8 *, u16, u8 *, u16);
+};
+
+/* functions for dump compression registration */
+extern void dump_register_compression(struct __dump_compress *);
+extern void dump_unregister_compression(int);
+
+/*
+ * Structure dump_mbank[]:
+ *
+ * For CONFIG_DISCONTIGMEM systems this array specifies the
+ * memory banks/chunks that need to be dumped after a panic.
+ *
+ * For classic systems it specifies a single set of pages from
+ * 0 to max_mapnr.
+ */
+struct __dump_mbank {
+ u64 start;
+ u64 end;
+ int type;
+ int pad1;
+ long pad2;
+};
+
+#define DUMP_MBANK_TYPE_CONVENTIONAL_MEMORY 1
+#define DUMP_MBANK_TYPE_OTHER 2
+
+#define MAXCHUNKS 256
+extern int dump_mbanks;
+extern struct __dump_mbank dump_mbank[MAXCHUNKS];
+
+/* notification event codes */
+#define DUMP_BEGIN 0x0001 /* dump beginning */
+#define DUMP_END 0x0002 /* dump ending */
+
+/* Scheduler soft spin control.
+ *
+ * 0 - no dump in progress
+ * 1 - cpu0 is dumping, ...
+ */
+extern unsigned long dump_oncpu;
+extern void dump_execute(const char *, const struct pt_regs *);
+
+/*
+ * Notifier list for kernel code which wants to be called
+ * at kernel dump.
+ */
+extern struct notifier_block *dump_notifier_list;
+static inline int register_dump_notifier(struct notifier_block *nb)
+{
+ return notifier_chain_register(&dump_notifier_list, nb);
+}
+static inline int unregister_dump_notifier(struct notifier_block * nb)
+{
+ return notifier_chain_unregister(&dump_notifier_list, nb);
+}
+
+extern void (*dump_function_ptr)(const char *, const struct pt_regs *);
+static inline void dump(char * str, struct pt_regs * regs)
+{
+ if (dump_function_ptr)
+ dump_function_ptr(str, regs);
+}
+
+/*
+ * Common Arch Specific Functions should be declared here.
+ * This allows the C compiler to detect discrepancies.
+ */
+extern void __dump_open(void);
+extern void __dump_cleanup(void);
+extern void __dump_init(u64);
+extern void __dump_save_regs(struct pt_regs *, const struct pt_regs *);
+extern int __dump_configure_header(const struct pt_regs *);
+extern int __dump_irq_enable(void);
+extern void __dump_irq_restore(void);
+extern int __dump_page_valid(unsigned long index);
+#ifdef CONFIG_SMP
+extern void __dump_save_other_cpus(void);
+#else
+#define __dump_save_other_cpus()
+#endif
+
+extern int manual_handle_crashdump(void);
+
+/* to track all used (compound + zero order) pages */
+#define PageInuse(p) (PageCompound(p) || page_count(p))
+
+#endif /* __KERNEL__ */
+
+#else /* !CONFIG_CRASH_DUMP */
+
+/* If not configured then make code disappear! */
+#define register_dump_watchdog(x) do { } while(0)
+#define unregister_dump_watchdog(x) do { } while(0)
+#define register_dump_notifier(x) do { } while(0)
+#define unregister_dump_notifier(x) do { } while(0)
+#define dump_in_progress() 0
+#define dump(x, y) do { } while(0)
+
+#endif /* !CONFIG_CRASH_DUMP */
+
+#endif /* _DUMP_H */
--- /dev/null
+/*
+ * linux/drivers/net/netconsole.h
+ *
+ * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
+ *
+ * This file contains the implementation of an IRQ-safe, crash-safe
+ * kernel console implementation that outputs kernel messages to the
+ * network.
+ *
+ * Modification history:
+ *
+ * 2001-09-17 started by Ingo Molnar.
+ */
+
+/****************************************************************
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ ****************************************************************/
+
+#define NETCONSOLE_VERSION 0x03
+
+enum netdump_commands {
+ COMM_NONE = 0,
+ COMM_SEND_MEM = 1,
+ COMM_EXIT = 2,
+ COMM_REBOOT = 3,
+ COMM_HELLO = 4,
+ COMM_GET_NR_PAGES = 5,
+ COMM_GET_PAGE_SIZE = 6,
+ COMM_START_NETDUMP_ACK = 7,
+ COMM_GET_REGS = 8,
+ COMM_GET_MAGIC = 9,
+ COMM_START_WRITE_NETDUMP_ACK = 10,
+};
+
+typedef struct netdump_req_s {
+ u64 magic;
+ u32 nr;
+ u32 command;
+ u32 from;
+ u32 to;
+} req_t;
+
+enum netdump_replies {
+ REPLY_NONE = 0,
+ REPLY_ERROR = 1,
+ REPLY_LOG = 2,
+ REPLY_MEM = 3,
+ REPLY_RESERVED = 4,
+ REPLY_HELLO = 5,
+ REPLY_NR_PAGES = 6,
+ REPLY_PAGE_SIZE = 7,
+ REPLY_START_NETDUMP = 8,
+ REPLY_END_NETDUMP = 9,
+ REPLY_REGS = 10,
+ REPLY_MAGIC = 11,
+ REPLY_START_WRITE_NETDUMP = 12,
+};
+
+typedef struct netdump_reply_s {
+ u32 nr;
+ u32 code;
+ u32 info;
+} reply_t;
+
+#define HEADER_LEN (1 + sizeof(reply_t))
+
+
--- /dev/null
+/*
+ * Generic dump device interfaces for flexible system dump
+ * (Enables variation of dump target types e.g disk, network, memory)
+ *
+ * These interfaces have evolved based on discussions on lkcd-devel.
+ * Eventually the intent is to support primary and secondary or
+ * alternate targets registered at the same time, with scope for
+ * situation based failover or multiple dump devices used for parallel
+ * dump i/o.
+ *
+ * Started: Oct 2002 - Suparna Bhattacharya (suparna@in.ibm.com)
+ *
+ * Copyright (C) 2001 - 2002 Matt D. Robinson. All rights reserved.
+ * Copyright (C) 2002 International Business Machines Corp.
+ *
+ * This code is released under version 2 of the GNU GPL.
+ */
+
+#ifndef _LINUX_DUMPDEV_H
+#define _LINUX_DUMPDEV_H
+
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/bio.h>
+
+/* Determined by the dump target (device) type */
+
+struct dump_dev;
+
+struct dump_dev_ops {
+ int (*open)(struct dump_dev *, unsigned long); /* configure */
+ int (*release)(struct dump_dev *); /* unconfigure */
+ int (*silence)(struct dump_dev *); /* when dump starts */
+ int (*resume)(struct dump_dev *); /* when dump is over */
+ int (*seek)(struct dump_dev *, loff_t);
+ /* trigger a write (async in nature typically) */
+ int (*write)(struct dump_dev *, void *, unsigned long);
+ /* not usually used during dump, but option available */
+ int (*read)(struct dump_dev *, void *, unsigned long);
+ /* use to poll for completion */
+ int (*ready)(struct dump_dev *, void *);
+ int (*ioctl)(struct dump_dev *, unsigned int, unsigned long);
+};
+
+struct dump_dev {
+ char type_name[32]; /* block, net-poll etc */
+ unsigned long device_id; /* interpreted differently for various types */
+ struct dump_dev_ops *ops;
+ struct list_head list;
+ loff_t curr_offset;
+};
+
+/*
+ * dump_dev type variations:
+ */
+
+/* block */
+struct dump_blockdev {
+ struct dump_dev ddev;
+ dev_t dev_id;
+ struct block_device *bdev;
+ struct bio *bio;
+ loff_t start_offset;
+ loff_t limit;
+ int err;
+};
+
+static inline struct dump_blockdev *DUMP_BDEV(struct dump_dev *dev)
+{
+ return container_of(dev, struct dump_blockdev, ddev);
+}
+
+
+/* mem - for internal use by soft-boot based dumper */
+struct dump_memdev {
+ struct dump_dev ddev;
+ unsigned long indirect_map_root;
+ unsigned long nr_free;
+ struct page *curr_page;
+ unsigned long *curr_map;
+ unsigned long curr_map_offset;
+ unsigned long last_offset;
+ unsigned long last_used_offset;
+ unsigned long last_bs_offset;
+};
+
+static inline struct dump_memdev *DUMP_MDEV(struct dump_dev *dev)
+{
+ return container_of(dev, struct dump_memdev, ddev);
+}
+
+/* Todo/future - meant for raw dedicated interfaces e.g. mini-ide driver */
+struct dump_rdev {
+ struct dump_dev ddev;
+ char name[32];
+ int (*reset)(struct dump_rdev *, unsigned int,
+ unsigned long);
+ /* ... to do ... */
+};
+
+/* just to get the size right when saving config across a soft-reboot */
+struct dump_anydev {
+ union {
+ struct dump_blockdev bddev;
+ /* .. add other types here .. */
+ };
+};
+
+
+
+/* Dump device / target operation wrappers */
+/* These assume that dump_dev is initiatized to dump_config.dumper->dev */
+
+extern struct dump_dev *dump_dev;
+
+static inline int dump_dev_open(unsigned long arg)
+{
+ return dump_dev->ops->open(dump_dev, arg);
+}
+
+static inline int dump_dev_release(void)
+{
+ return dump_dev->ops->release(dump_dev);
+}
+
+static inline int dump_dev_silence(void)
+{
+ return dump_dev->ops->silence(dump_dev);
+}
+
+static inline int dump_dev_resume(void)
+{
+ return dump_dev->ops->resume(dump_dev);
+}
+
+static inline int dump_dev_seek(loff_t offset)
+{
+ return dump_dev->ops->seek(dump_dev, offset);
+}
+
+static inline int dump_dev_write(void *buf, unsigned long len)
+{
+ return dump_dev->ops->write(dump_dev, buf, len);
+}
+
+static inline int dump_dev_ready(void *buf)
+{
+ return dump_dev->ops->ready(dump_dev, buf);
+}
+
+static inline int dump_dev_ioctl(unsigned int cmd, unsigned long arg)
+{
+ if (!dump_dev || !dump_dev->ops->ioctl)
+ return -EINVAL;
+ return dump_dev->ops->ioctl(dump_dev, cmd, arg);
+}
+
+extern int dump_register_device(struct dump_dev *);
+extern void dump_unregister_device(struct dump_dev *);
+
+#endif /* _LINUX_DUMPDEV_H */
--- /dev/null
+/*
+ * kerntypes.c
+ *
+ * Copyright (C) 2000 Tom Morano (tjm@sgi.com) and
+ * Matt D. Robinson (yakker@alacritech.com)
+ *
+ * Dummy module that includes headers for all kernel types of interest.
+ * The kernel type information is used by the lcrash utility when
+ * analyzing system crash dumps or the live system. Using the type
+ * information for the running system, rather than kernel header files,
+ * makes for a more flexible and robust analysis tool.
+ *
+ * This source code is released under version 2 of the GNU GPL.
+ */
+
+#include <linux/compile.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/config.h>
+#include <linux/utsname.h>
+#include <linux/dump.h>
+
+#ifdef LINUX_COMPILE_VERSION_ID_TYPE
+/* Define version type for version validation of dump and kerntypes */
+LINUX_COMPILE_VERSION_ID_TYPE;
+#endif
+
+void
+kerntypes_dummy(void)
+{
+}
git://git.onelab.eu / linux-2.6.git / commitdiff