--- /dev/null
+/*
+ * fs/hypfs/hypfs_diag.c
+ * Hypervisor filesystem for Linux on s390. Diag 204 and 224
+ * implementation.
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+#include <asm/ebcdic.h>
+#include "hypfs.h"
+
+#define LPAR_NAME_LEN 8 /* lpar name len in diag 204 data */
+#define CPU_NAME_LEN 16 /* type name len of cpus in diag224 name table */
+#define TMP_SIZE 64 /* size of temporary buffers */
+
+/* diag 204 subcodes */
+enum diag204_sc {
+ SUBC_STIB4 = 4,
+ SUBC_RSI = 5,
+ SUBC_STIB6 = 6,
+ SUBC_STIB7 = 7
+};
+
+/* The two available diag 204 data formats */
+enum diag204_format {
+ INFO_SIMPLE = 0,
+ INFO_EXT = 0x00010000
+};
+
+/* bit is set in flags, when physical cpu info is included in diag 204 data */
+#define LPAR_PHYS_FLG 0x80
+
+static char *diag224_cpu_names; /* diag 224 name table */
+static enum diag204_sc diag204_store_sc; /* used subcode for store */
+static enum diag204_format diag204_info_type; /* used diag 204 data format */
+
+static void *diag204_buf; /* 4K aligned buffer for diag204 data */
+static void *diag204_buf_vmalloc; /* vmalloc pointer for diag204 data */
+static int diag204_buf_pages; /* number of pages for diag204 data */
+
+/*
+ * DIAG 204 data structures and member access functions.
+ *
+ * Since we have two different diag 204 data formats for old and new s390
+ * machines, we do not access the structs directly, but use getter functions for
+ * each struct member instead. This should make the code more readable.
+ */
+
+/* Time information block */
+
+struct info_blk_hdr {
+ __u8 npar;
+ __u8 flags;
+ __u16 tslice;
+ __u16 phys_cpus;
+ __u16 this_part;
+ __u64 curtod;
+} __attribute__ ((packed));
+
+struct x_info_blk_hdr {
+ __u8 npar;
+ __u8 flags;
+ __u16 tslice;
+ __u16 phys_cpus;
+ __u16 this_part;
+ __u64 curtod1;
+ __u64 curtod2;
+ char reserved[40];
+} __attribute__ ((packed));
+
+static inline int info_blk_hdr__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct info_blk_hdr);
+ else /* INFO_EXT */
+ return sizeof(struct x_info_blk_hdr);
+}
+
+static inline __u8 info_blk_hdr__npar(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct info_blk_hdr *)hdr)->npar;
+ else /* INFO_EXT */
+ return ((struct x_info_blk_hdr *)hdr)->npar;
+}
+
+static inline __u8 info_blk_hdr__flags(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct info_blk_hdr *)hdr)->flags;
+ else /* INFO_EXT */
+ return ((struct x_info_blk_hdr *)hdr)->flags;
+}
+
+static inline __u16 info_blk_hdr__pcpus(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct info_blk_hdr *)hdr)->phys_cpus;
+ else /* INFO_EXT */
+ return ((struct x_info_blk_hdr *)hdr)->phys_cpus;
+}
+
+/* Partition header */
+
+struct part_hdr {
+ __u8 pn;
+ __u8 cpus;
+ char reserved[6];
+ char part_name[LPAR_NAME_LEN];
+} __attribute__ ((packed));
+
+struct x_part_hdr {
+ __u8 pn;
+ __u8 cpus;
+ __u8 rcpus;
+ __u8 pflag;
+ __u32 mlu;
+ char part_name[LPAR_NAME_LEN];
+ char lpc_name[8];
+ char os_name[8];
+ __u64 online_cs;
+ __u64 online_es;
+ __u8 upid;
+ char reserved1[3];
+ __u32 group_mlu;
+ char group_name[8];
+ char reserved2[32];
+} __attribute__ ((packed));
+
+static inline int part_hdr__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct part_hdr);
+ else /* INFO_EXT */
+ return sizeof(struct x_part_hdr);
+}
+
+static inline __u8 part_hdr__rcpus(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct part_hdr *)hdr)->cpus;
+ else /* INFO_EXT */
+ return ((struct x_part_hdr *)hdr)->rcpus;
+}
+
+static inline void part_hdr__part_name(enum diag204_format type, void *hdr,
+ char *name)
+{
+ if (type == INFO_SIMPLE)
+ memcpy(name, ((struct part_hdr *)hdr)->part_name,
+ LPAR_NAME_LEN);
+ else /* INFO_EXT */
+ memcpy(name, ((struct x_part_hdr *)hdr)->part_name,
+ LPAR_NAME_LEN);
+ EBCASC(name, LPAR_NAME_LEN);
+ name[LPAR_NAME_LEN] = 0;
+ strstrip(name);
+}
+
+struct cpu_info {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ __u8 cflag;
+ __u16 weight;
+ __u64 acc_time;
+ __u64 lp_time;
+} __attribute__ ((packed));
+
+struct x_cpu_info {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ __u8 cflag;
+ __u16 weight;
+ __u64 acc_time;
+ __u64 lp_time;
+ __u16 min_weight;
+ __u16 cur_weight;
+ __u16 max_weight;
+ char reseved2[2];
+ __u64 online_time;
+ __u64 wait_time;
+ __u32 pma_weight;
+ __u32 polar_weight;
+ char reserved3[40];
+} __attribute__ ((packed));
+
+/* CPU info block */
+
+static inline int cpu_info__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct cpu_info);
+ else /* INFO_EXT */
+ return sizeof(struct x_cpu_info);
+}
+
+static inline __u8 cpu_info__ctidx(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->ctidx;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->ctidx;
+}
+
+static inline __u16 cpu_info__cpu_addr(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->cpu_addr;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->cpu_addr;
+}
+
+static inline __u64 cpu_info__acc_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->acc_time;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->acc_time;
+}
+
+static inline __u64 cpu_info__lp_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct cpu_info *)hdr)->lp_time;
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->lp_time;
+}
+
+static inline __u64 cpu_info__online_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return 0; /* online_time not available in simple info */
+ else /* INFO_EXT */
+ return ((struct x_cpu_info *)hdr)->online_time;
+}
+
+/* Physical header */
+
+struct phys_hdr {
+ char reserved1[1];
+ __u8 cpus;
+ char reserved2[6];
+ char mgm_name[8];
+} __attribute__ ((packed));
+
+struct x_phys_hdr {
+ char reserved1[1];
+ __u8 cpus;
+ char reserved2[6];
+ char mgm_name[8];
+ char reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_hdr__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct phys_hdr);
+ else /* INFO_EXT */
+ return sizeof(struct x_phys_hdr);
+}
+
+static inline __u8 phys_hdr__cpus(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_hdr *)hdr)->cpus;
+ else /* INFO_EXT */
+ return ((struct x_phys_hdr *)hdr)->cpus;
+}
+
+/* Physical CPU info block */
+
+struct phys_cpu {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ char reserved2[3];
+ __u64 mgm_time;
+ char reserved3[8];
+} __attribute__ ((packed));
+
+struct x_phys_cpu {
+ __u16 cpu_addr;
+ char reserved1[2];
+ __u8 ctidx;
+ char reserved2[3];
+ __u64 mgm_time;
+ char reserved3[80];
+} __attribute__ ((packed));
+
+static inline int phys_cpu__size(enum diag204_format type)
+{
+ if (type == INFO_SIMPLE)
+ return sizeof(struct phys_cpu);
+ else /* INFO_EXT */
+ return sizeof(struct x_phys_cpu);
+}
+
+static inline __u16 phys_cpu__cpu_addr(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_cpu *)hdr)->cpu_addr;
+ else /* INFO_EXT */
+ return ((struct x_phys_cpu *)hdr)->cpu_addr;
+}
+
+static inline __u64 phys_cpu__mgm_time(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_cpu *)hdr)->mgm_time;
+ else /* INFO_EXT */
+ return ((struct x_phys_cpu *)hdr)->mgm_time;
+}
+
+static inline __u64 phys_cpu__ctidx(enum diag204_format type, void *hdr)
+{
+ if (type == INFO_SIMPLE)
+ return ((struct phys_cpu *)hdr)->ctidx;
+ else /* INFO_EXT */
+ return ((struct x_phys_cpu *)hdr)->ctidx;
+}
+
+/* Diagnose 204 functions */
+
+static int diag204(unsigned long subcode, unsigned long size, void *addr)
+{
+ register unsigned long _subcode asm("0") = subcode;
+ register unsigned long _size asm("1") = size;
+
+ asm volatile (" diag %2,%0,0x204\n"
+ "0: \n" ".section __ex_table,\"a\"\n"
+#ifndef __s390x__
+ " .align 4\n"
+ " .long 0b,0b\n"
+#else
+ " .align 8\n"
+ " .quad 0b,0b\n"
+#endif
+ ".previous":"+d" (_subcode), "+d"(_size)
+ :"d"(addr)
+ :"memory");
+ if (_subcode)
+ return -1;
+ else
+ return _size;
+}
+
+/*
+ * For the old diag subcode 4 with simple data format we have to use real
+ * memory. If we use subcode 6 or 7 with extended data format, we can (and
+ * should) use vmalloc, since we need a lot of memory in that case. Currently
+ * up to 93 pages!
+ */
+
+static void diag204_free_buffer(void)
+{
+ if (!diag204_buf)
+ return;
+ if (diag204_buf_vmalloc) {
+ vfree(diag204_buf_vmalloc);
+ diag204_buf_vmalloc = NULL;
+ } else {
+ free_pages((unsigned long) diag204_buf, 0);
+ }
+ diag204_buf_pages = 0;
+ diag204_buf = NULL;
+}
+
+static void *diag204_alloc_vbuf(int pages)
+{
+ /* The buffer has to be page aligned! */
+ diag204_buf_vmalloc = vmalloc(PAGE_SIZE * (pages + 1));
+ if (!diag204_buf_vmalloc)
+ return ERR_PTR(-ENOMEM);
+ diag204_buf = (void*)((unsigned long)diag204_buf_vmalloc
+ & ~0xfffUL) + 0x1000;
+ diag204_buf_pages = pages;
+ return diag204_buf;
+}
+
+static void *diag204_alloc_rbuf(void)
+{
+ diag204_buf = (void*)__get_free_pages(GFP_KERNEL,0);
+ if (diag204_buf)
+ return ERR_PTR(-ENOMEM);
+ diag204_buf_pages = 1;
+ return diag204_buf;
+}
+
+static void *diag204_get_buffer(enum diag204_format fmt, int *pages)
+{
+ if (diag204_buf) {
+ *pages = diag204_buf_pages;
+ return diag204_buf;
+ }
+ if (fmt == INFO_SIMPLE) {
+ *pages = 1;
+ return diag204_alloc_rbuf();
+ } else {/* INFO_EXT */
+ *pages = diag204(SUBC_RSI | INFO_EXT, 0, NULL);
+ if (*pages <= 0)
+ return ERR_PTR(-ENOSYS);
+ else
+ return diag204_alloc_vbuf(*pages);
+ }
+}
+
+/*
+ * diag204_probe() has to find out, which type of diagnose 204 implementation
+ * we have on our machine. Currently there are three possible scanarios:
+ * - subcode 4 + simple data format (only one page)
+ * - subcode 4-6 + extended data format
+ * - subcode 4-7 + extended data format
+ *
+ * Subcode 5 is used to retrieve the size of the data, provided by subcodes
+ * 6 and 7. Subcode 7 basically has the same function as subcode 6. In addition
+ * to subcode 6 it provides also information about secondary cpus.
+ * In order to get as much information as possible, we first try
+ * subcode 7, then 6 and if both fail, we use subcode 4.
+ */
+
+static int diag204_probe(void)
+{
+ void *buf;
+ int pages, rc;
+
+ buf = diag204_get_buffer(INFO_EXT, &pages);
+ if (!IS_ERR(buf)) {
+ if (diag204(SUBC_STIB7 | INFO_EXT, pages, buf) >= 0) {
+ diag204_store_sc = SUBC_STIB7;
+ diag204_info_type = INFO_EXT;
+ goto out;
+ }
+ if (diag204(SUBC_STIB6 | INFO_EXT, pages, buf) >= 0) {
+ diag204_store_sc = SUBC_STIB7;
+ diag204_info_type = INFO_EXT;
+ goto out;
+ }
+ diag204_free_buffer();
+ }
+
+ /* subcodes 6 and 7 failed, now try subcode 4 */
+
+ buf = diag204_get_buffer(INFO_SIMPLE, &pages);
+ if (IS_ERR(buf)) {
+ rc = PTR_ERR(buf);
+ goto fail_alloc;
+ }
+ if (diag204(SUBC_STIB4 | INFO_SIMPLE, pages, buf) >= 0) {
+ diag204_store_sc = SUBC_STIB4;
+ diag204_info_type = INFO_SIMPLE;
+ goto out;
+ } else {
+ rc = -ENOSYS;
+ goto fail_store;
+ }
+out:
+ rc = 0;
+fail_store:
+ diag204_free_buffer();
+fail_alloc:
+ return rc;
+}
+
+static void *diag204_store(void)
+{
+ void *buf;
+ int pages;
+
+ buf = diag204_get_buffer(diag204_info_type, &pages);
+ if (IS_ERR(buf))
+ goto out;
+ if (diag204(diag204_store_sc | diag204_info_type, pages, buf) < 0)
+ return ERR_PTR(-ENOSYS);
+out:
+ return buf;
+}
+
+/* Diagnose 224 functions */
+
+static void diag224(void *ptr)
+{
+ asm volatile(" diag %0,%1,0x224\n"
+ : :"d" (0), "d"(ptr) : "memory");
+}
+
+static int diag224_get_name_table(void)
+{
+ /* memory must be below 2GB */
+ diag224_cpu_names = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+ if (!diag224_cpu_names)
+ return -ENOMEM;
+ diag224(diag224_cpu_names);
+ EBCASC(diag224_cpu_names + 16, (*diag224_cpu_names + 1) * 16);
+ return 0;
+}
+
+static void diag224_delete_name_table(void)
+{
+ kfree(diag224_cpu_names);
+}
+
+static int diag224_idx2name(int index, char *name)
+{
+ memcpy(name, diag224_cpu_names + ((index + 1) * CPU_NAME_LEN),
+ CPU_NAME_LEN);
+ name[CPU_NAME_LEN] = 0;
+ strstrip(name);
+ return 0;
+}
+
+__init int hypfs_diag_init(void)
+{
+ int rc;
+
+ if (diag204_probe()) {
+ printk(KERN_ERR "hypfs: diag 204 not working.");
+ return -ENODATA;
+ }
+ rc = diag224_get_name_table();
+ if (rc) {
+ diag224_delete_name_table();
+ printk(KERN_ERR "hypfs: could not get name table.\n");
+ }
+ return rc;
+}
+
+__exit void hypfs_diag_exit(void)
+{
+ diag224_delete_name_table();
+ diag204_free_buffer();
+}
+
+/*
+ * Functions to create the directory structure
+ * *******************************************
+ */
+
+static int hypfs_create_cpu_files(struct super_block *sb,
+ struct dentry *cpus_dir, void *cpu_info)
+{
+ struct dentry *cpu_dir;
+ char buffer[TMP_SIZE];
+ void *rc;
+
+ snprintf(buffer, TMP_SIZE, "%d", cpu_info__cpu_addr(diag204_info_type,
+ cpu_info));
+ cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
+ rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
+ cpu_info__acc_time(diag204_info_type, cpu_info) -
+ cpu_info__lp_time(diag204_info_type, cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ rc = hypfs_create_u64(sb, cpu_dir, "cputime",
+ cpu_info__lp_time(diag204_info_type, cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ if (diag204_info_type == INFO_EXT) {
+ rc = hypfs_create_u64(sb, cpu_dir, "onlinetime",
+ cpu_info__online_time(diag204_info_type,
+ cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ }
+ diag224_idx2name(cpu_info__ctidx(diag204_info_type, cpu_info), buffer);
+ rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ return 0;
+}
+
+static void *hypfs_create_lpar_files(struct super_block *sb,
+ struct dentry *systems_dir, void *part_hdr)
+{
+ struct dentry *cpus_dir;
+ struct dentry *lpar_dir;
+ char lpar_name[LPAR_NAME_LEN + 1];
+ void *cpu_info;
+ int i;
+
+ part_hdr__part_name(diag204_info_type, part_hdr, lpar_name);
+ lpar_name[LPAR_NAME_LEN] = 0;
+ lpar_dir = hypfs_mkdir(sb, systems_dir, lpar_name);
+ if (IS_ERR(lpar_dir))
+ return lpar_dir;
+ cpus_dir = hypfs_mkdir(sb, lpar_dir, "cpus");
+ if (IS_ERR(cpus_dir))
+ return cpus_dir;
+ cpu_info = part_hdr + part_hdr__size(diag204_info_type);
+ for (i = 0; i < part_hdr__rcpus(diag204_info_type, part_hdr); i++) {
+ int rc;
+ rc = hypfs_create_cpu_files(sb, cpus_dir, cpu_info);
+ if (rc)
+ return ERR_PTR(rc);
+ cpu_info += cpu_info__size(diag204_info_type);
+ }
+ return cpu_info;
+}
+
+static int hypfs_create_phys_cpu_files(struct super_block *sb,
+ struct dentry *cpus_dir, void *cpu_info)
+{
+ struct dentry *cpu_dir;
+ char buffer[TMP_SIZE];
+ void *rc;
+
+ snprintf(buffer, TMP_SIZE, "%i", phys_cpu__cpu_addr(diag204_info_type,
+ cpu_info));
+ cpu_dir = hypfs_mkdir(sb, cpus_dir, buffer);
+ if (IS_ERR(cpu_dir))
+ return PTR_ERR(cpu_dir);
+ rc = hypfs_create_u64(sb, cpu_dir, "mgmtime",
+ phys_cpu__mgm_time(diag204_info_type, cpu_info));
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ diag224_idx2name(phys_cpu__ctidx(diag204_info_type, cpu_info), buffer);
+ rc = hypfs_create_str(sb, cpu_dir, "type", buffer);
+ if (IS_ERR(rc))
+ return PTR_ERR(rc);
+ return 0;
+}
+
+static void *hypfs_create_phys_files(struct super_block *sb,
+ struct dentry *parent_dir, void *phys_hdr)
+{
+ int i;
+ void *cpu_info;
+ struct dentry *cpus_dir;
+
+ cpus_dir = hypfs_mkdir(sb, parent_dir, "cpus");
+ if (IS_ERR(cpus_dir))
+ return cpus_dir;
+ cpu_info = phys_hdr + phys_hdr__size(diag204_info_type);
+ for (i = 0; i < phys_hdr__cpus(diag204_info_type, phys_hdr); i++) {
+ int rc;
+ rc = hypfs_create_phys_cpu_files(sb, cpus_dir, cpu_info);
+ if (rc)
+ return ERR_PTR(rc);
+ cpu_info += phys_cpu__size(diag204_info_type);
+ }
+ return cpu_info;
+}
+
+int hypfs_diag_create_files(struct super_block *sb, struct dentry *root)
+{
+ struct dentry *systems_dir, *hyp_dir;
+ void *time_hdr, *part_hdr;
+ int i, rc;
+ void *buffer, *ptr;
+
+ buffer = diag204_store();
+ if (IS_ERR(buffer))
+ return PTR_ERR(buffer);
+
+ systems_dir = hypfs_mkdir(sb, root, "systems");
+ if (IS_ERR(systems_dir)) {
+ rc = PTR_ERR(systems_dir);
+ goto err_out;
+ }
+ time_hdr = (struct x_info_blk_hdr *)buffer;
+ part_hdr = time_hdr + info_blk_hdr__size(diag204_info_type);
+ for (i = 0; i < info_blk_hdr__npar(diag204_info_type, time_hdr); i++) {
+ part_hdr = hypfs_create_lpar_files(sb, systems_dir, part_hdr);
+ if (IS_ERR(part_hdr)) {
+ rc = PTR_ERR(part_hdr);
+ goto err_out;
+ }
+ }
+ if (info_blk_hdr__flags(diag204_info_type, time_hdr) & LPAR_PHYS_FLG) {
+ ptr = hypfs_create_phys_files(sb, root, part_hdr);
+ if (IS_ERR(ptr)) {
+ rc = PTR_ERR(ptr);
+ goto err_out;
+ }
+ }
+ hyp_dir = hypfs_mkdir(sb, root, "hyp");
+ if (IS_ERR(hyp_dir)) {
+ rc = PTR_ERR(hyp_dir);
+ goto err_out;
+ }
+ ptr = hypfs_create_str(sb, hyp_dir, "type", "LPAR Hypervisor");
+ if (IS_ERR(ptr)) {
+ rc = PTR_ERR(ptr);
+ goto err_out;
+ }
+ rc = 0;
+
+err_out:
+ return rc;
+}
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