3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
4 * to allow user process control of SCSI devices.
5 * Development Sponsored by Killy Corp. NY NY
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 2002 Douglas Gilbert
12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
20 #include <linux/config.h>
21 static int sg_version_num = 30530; /* 2 digits for each component */
23 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 * Then before running the program to be debugged enter:
28 * # echo "scsi log timeout 7" > /proc/scsi/scsi
29 * This will send copious output to the console and the log which
30 * is usually /var/log/messages. To turn off debugging enter:
31 * # echo "scsi log timeout 0" > /proc/scsi/scsi
32 * The 'timeout' token was chosen because it is relatively unused.
33 * The token 'hlcomplete' should be used but that triggers too
34 * much output from the sd device driver. To dump the current
35 * state of the SCSI mid level data structures enter:
36 * # echo "scsi dump 1" > /proc/scsi/scsi
37 * To dump the state of sg's data structures use:
38 * # cat /proc/scsi/sg/debug
41 #include <linux/module.h>
44 #include <linux/kernel.h>
45 #include <linux/sched.h>
46 #include <linux/string.h>
48 #include <linux/errno.h>
49 #include <linux/mtio.h>
50 #include <linux/ioctl.h>
51 #include <linux/fcntl.h>
52 #include <linux/init.h>
53 #include <linux/poll.h>
54 #include <linux/vmalloc.h>
55 #include <linux/smp_lock.h>
56 #include <linux/moduleparam.h>
57 #include <linux/devfs_fs_kernel.h>
58 #include <linux/cdev.h>
59 #include <linux/seq_file.h>
61 #include <linux/blkdev.h>
64 #include <scsi/scsi_driver.h>
65 #include <scsi/scsi_ioctl.h>
68 #include "scsi_logging.h"
70 #ifdef CONFIG_SCSI_PROC_FS
71 #include <linux/proc_fs.h>
72 static char *sg_version_str = "3.5.30 [20040124]";
74 static int sg_proc_init(void);
75 static void sg_proc_cleanup(void);
78 #ifndef LINUX_VERSION_CODE
79 #include <linux/version.h>
80 #endif /* LINUX_VERSION_CODE */
82 #define SG_ALLOW_DIO_DEF 0
83 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
85 #define SG_MAX_DEVS 8192
88 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
89 * Then when using 32 bit integers x * m may overflow during the calculation.
90 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
91 * calculates the same, but prevents the overflow when both m and d
92 * are "small" numbers (like HZ and USER_HZ).
93 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
96 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
98 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
100 int sg_big_buff = SG_DEF_RESERVED_SIZE;
101 /* N.B. This variable is readable and writeable via
102 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
103 of this size (or less if there is not enough memory) will be reserved
104 for use by this file descriptor. [Deprecated usage: this variable is also
105 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
106 the kernel (i.e. it is not a module).] */
107 static int def_reserved_size = -1; /* picks up init parameter */
108 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
110 #define SG_SECTOR_SZ 512
111 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
113 #define SG_DEV_ARR_LUMP 6 /* amount to over allocate sg_dev_arr by */
115 static int sg_add(struct class_device *);
116 static void sg_remove(struct class_device *);
118 static Scsi_Request *dummy_cmdp; /* only used for sizeof */
120 static rwlock_t sg_dev_arr_lock = RW_LOCK_UNLOCKED; /* Also used to lock
121 file descriptor list for device */
123 static struct class_interface sg_interface = {
128 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
129 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
130 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
131 unsigned bufflen; /* Size of (aggregate) data buffer */
132 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
133 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
134 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
135 unsigned char cmd_opcode; /* first byte of command */
138 struct sg_device; /* forward declarations */
141 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
142 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
143 struct sg_request *nextrp; /* NULL -> tail request (slist) */
144 struct sg_fd *parentfp; /* NULL -> not in use */
145 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
146 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
147 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
148 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
149 char orphan; /* 1 -> drop on sight, 0 -> normal */
150 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
151 volatile char done; /* 0->before bh, 1->before read, 2->read */
154 typedef struct sg_fd { /* holds the state of a file descriptor */
155 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
156 struct sg_device *parentdp; /* owning device */
157 wait_queue_head_t read_wait; /* queue read until command done */
158 rwlock_t rq_list_lock; /* protect access to list in req_arr */
159 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
160 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
161 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
162 unsigned save_scat_len; /* original length of trunc. scat. element */
163 Sg_request *headrp; /* head of request slist, NULL->empty */
164 struct fasync_struct *async_qp; /* used by asynchronous notification */
165 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
166 char low_dma; /* as in parent but possibly overridden to 1 */
167 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
168 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
169 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
170 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
171 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
172 char mmap_called; /* 0 -> mmap() never called on this fd */
175 typedef struct sg_device { /* holds the state of each scsi generic device */
176 struct scsi_device *device;
177 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
178 int sg_tablesize; /* adapter's max scatter-gather table size */
179 Sg_fd *headfp; /* first open fd belonging to this device */
180 volatile char detached; /* 0->attached, 1->detached pending removal */
181 volatile char exclude; /* opened for exclusive access */
182 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
183 struct gendisk *disk;
184 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
187 static int sg_fasync(int fd, struct file *filp, int mode);
188 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
189 static int sg_start_req(Sg_request * srp);
190 static void sg_finish_rem_req(Sg_request * srp);
191 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
192 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
194 static ssize_t sg_new_read(Sg_fd * sfp, char *buf, size_t count,
196 static ssize_t sg_new_write(Sg_fd * sfp, const char *buf, size_t count,
197 int blocking, int read_only, Sg_request ** o_srp);
198 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
199 unsigned char *cmnd, int timeout, int blocking);
200 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
201 int wr_xf, int *countp, unsigned char **up);
202 static int sg_write_xfer(Sg_request * srp);
203 static int sg_read_xfer(Sg_request * srp);
204 static int sg_read_oxfer(Sg_request * srp, char *outp, int num_read_xfer);
205 static void sg_remove_scat(Sg_scatter_hold * schp);
206 static void sg_build_reserve(Sg_fd * sfp, int req_size);
207 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
208 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
209 static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
210 static void sg_page_free(char *buff, int size);
211 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
212 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
213 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
214 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
215 static Sg_request *sg_add_request(Sg_fd * sfp);
216 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
217 static int sg_res_in_use(Sg_fd * sfp);
218 static int sg_ms_to_jif(unsigned int msecs);
219 static inline unsigned sg_jif_to_ms(int jifs);
220 static int sg_allow_access(unsigned char opcode, char dev_type);
221 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
222 static Sg_device *sg_get_dev(int dev);
223 static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
224 #ifdef CONFIG_SCSI_PROC_FS
225 static int sg_last_dev(void);
228 static Sg_device **sg_dev_arr = NULL;
229 static int sg_dev_max;
230 static int sg_nr_dev;
232 #define SZ_SG_HEADER sizeof(struct sg_header)
233 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
234 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
235 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
238 sg_open(struct inode *inode, struct file *filp)
240 int dev = iminor(inode);
241 int flags = filp->f_flags;
247 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
248 sdp = sg_get_dev(dev);
249 if ((!sdp) || (!sdp->device))
254 /* This driver's module count bumped by fops_get in <linux/fs.h> */
255 /* Prevent the device driver from vanishing while we sleep */
256 retval = scsi_device_get(sdp->device);
260 if (!((flags & O_NONBLOCK) ||
261 scsi_block_when_processing_errors(sdp->device))) {
263 /* we are in error recovery for this device */
267 if (flags & O_EXCL) {
268 if (O_RDONLY == (flags & O_ACCMODE)) {
269 retval = -EPERM; /* Can't lock it with read only access */
272 if (sdp->headfp && (flags & O_NONBLOCK)) {
277 __wait_event_interruptible(sdp->o_excl_wait,
278 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
280 retval = res; /* -ERESTARTSYS because signal hit process */
283 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
284 if (flags & O_NONBLOCK) {
289 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
292 retval = res; /* -ERESTARTSYS because signal hit process */
300 if (!sdp->headfp) { /* no existing opens on this device */
302 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
304 if ((sfp = sg_add_sfp(sdp, dev)))
305 filp->private_data = sfp;
308 sdp->exclude = 0; /* undo if error */
315 scsi_device_put(sdp->device);
319 /* Following function was formerly called 'sg_close' */
321 sg_release(struct inode *inode, struct file *filp)
326 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
328 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
329 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
330 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
331 if (!sdp->detached) {
332 scsi_device_put(sdp->device);
335 wake_up_interruptible(&sdp->o_excl_wait);
341 sg_read(struct file *filp, char *buf, size_t count, loff_t * ppos)
347 int req_pack_id = -1;
348 struct sg_header old_hdr;
352 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
354 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
355 sdp->disk->disk_name, (int) count));
356 if (ppos != &filp->f_pos) ; /* FIXME: Hmm. Seek to the right place, or fail? */
357 if ((k = verify_area(VERIFY_WRITE, buf, count)))
359 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
360 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
362 if (old_hdr.reply_len < 0) {
363 if (count >= SZ_SG_IO_HDR) {
365 (&new_hdr, buf, SZ_SG_IO_HDR))
367 req_pack_id = new_hdr.pack_id;
370 req_pack_id = old_hdr.pack_id;
372 srp = sg_get_rq_mark(sfp, req_pack_id);
373 if (!srp) { /* now wait on packet to arrive */
376 if (filp->f_flags & O_NONBLOCK)
379 res = 0; /* following is a macro that beats race condition */
380 __wait_event_interruptible(sfp->read_wait,
381 (sdp->detached || (srp = sg_get_rq_mark(sfp, req_pack_id))),
387 return res; /* -ERESTARTSYS because signal hit process */
390 if (srp->header.interface_id != '\0')
391 return sg_new_read(sfp, buf, count, srp);
394 memset(&old_hdr, 0, SZ_SG_HEADER);
395 old_hdr.reply_len = (int) hp->timeout;
396 old_hdr.pack_len = old_hdr.reply_len; /* very old, strange behaviour */
397 old_hdr.pack_id = hp->pack_id;
398 old_hdr.twelve_byte =
399 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
400 old_hdr.target_status = hp->masked_status;
401 old_hdr.host_status = hp->host_status;
402 old_hdr.driver_status = hp->driver_status;
403 if ((CHECK_CONDITION & hp->masked_status) ||
404 (DRIVER_SENSE & hp->driver_status))
405 memcpy(old_hdr.sense_buffer, srp->sense_b,
406 sizeof (old_hdr.sense_buffer));
407 switch (hp->host_status) {
408 /* This setup of 'result' is for backward compatibility and is best
409 ignored by the user who should use target, host + driver status */
411 case DID_PASSTHROUGH:
418 old_hdr.result = EBUSY;
425 old_hdr.result = EIO;
428 old_hdr.result = (srp->sense_b[0] == 0 &&
429 hp->masked_status == GOOD) ? 0 : EIO;
432 old_hdr.result = EIO;
436 /* Now copy the result back to the user buffer. */
437 if (count >= SZ_SG_HEADER) {
438 if (__copy_to_user(buf, &old_hdr, SZ_SG_HEADER))
441 if (count > old_hdr.reply_len)
442 count = old_hdr.reply_len;
443 if (count > SZ_SG_HEADER) {
445 sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)))
449 count = (old_hdr.result == 0) ? 0 : -EIO;
450 sg_finish_rem_req(srp);
455 sg_new_read(Sg_fd * sfp, char *buf, size_t count, Sg_request * srp)
457 sg_io_hdr_t *hp = &srp->header;
461 if (count < SZ_SG_IO_HDR) {
466 if ((hp->mx_sb_len > 0) && hp->sbp) {
467 if ((CHECK_CONDITION & hp->masked_status) ||
468 (DRIVER_SENSE & hp->driver_status)) {
469 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
470 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
471 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
472 len = (len > sb_len) ? sb_len : len;
473 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
480 if (hp->masked_status || hp->host_status || hp->driver_status)
481 hp->info |= SG_INFO_CHECK;
482 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
486 err = sg_read_xfer(srp);
488 sg_finish_rem_req(srp);
489 return (0 == err) ? count : err;
493 sg_write(struct file *filp, const char *buf, size_t count, loff_t * ppos)
495 int mxsize, cmd_size, k;
496 int input_size, blocking;
497 unsigned char opcode;
501 struct sg_header old_hdr;
503 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
505 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
507 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
508 sdp->disk->disk_name, (int) count));
511 if (!((filp->f_flags & O_NONBLOCK) ||
512 scsi_block_when_processing_errors(sdp->device)))
514 if (ppos != &filp->f_pos) ; /* FIXME: Hmm. Seek to the right place, or fail? */
516 if ((k = verify_area(VERIFY_READ, buf, count)))
517 return k; /* protects following copy_from_user()s + get_user()s */
518 if (count < SZ_SG_HEADER)
520 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
522 blocking = !(filp->f_flags & O_NONBLOCK);
523 if (old_hdr.reply_len < 0)
524 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
525 if (count < (SZ_SG_HEADER + 6))
526 return -EIO; /* The minimum scsi command length is 6 bytes. */
528 if (!(srp = sg_add_request(sfp))) {
529 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
533 __get_user(opcode, buf);
534 if (sfp->next_cmd_len > 0) {
535 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
536 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
537 sfp->next_cmd_len = 0;
538 sg_remove_request(sfp, srp);
541 cmd_size = sfp->next_cmd_len;
542 sfp->next_cmd_len = 0; /* reset so only this write() effected */
544 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
545 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
548 SCSI_LOG_TIMEOUT(4, printk(
549 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
550 /* Determine buffer size. */
551 input_size = count - cmd_size;
552 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
553 mxsize -= SZ_SG_HEADER;
554 input_size -= SZ_SG_HEADER;
555 if (input_size < 0) {
556 sg_remove_request(sfp, srp);
557 return -EIO; /* User did not pass enough bytes for this command. */
560 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
561 hp->cmd_len = (unsigned char) cmd_size;
565 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
566 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
568 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
569 hp->dxfer_len = mxsize;
570 hp->dxferp = (unsigned char *) buf + cmd_size;
572 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
573 hp->flags = input_size; /* structure abuse ... */
574 hp->pack_id = old_hdr.pack_id;
576 if (__copy_from_user(cmnd, buf, cmd_size))
578 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
579 return (k < 0) ? k : count;
583 sg_new_write(Sg_fd * sfp, const char *buf, size_t count,
584 int blocking, int read_only, Sg_request ** o_srp)
589 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
592 if (count < SZ_SG_IO_HDR)
594 if ((k = verify_area(VERIFY_READ, buf, count)))
595 return k; /* protects following copy_from_user()s + get_user()s */
597 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
598 if (!(srp = sg_add_request(sfp))) {
599 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
603 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
604 sg_remove_request(sfp, srp);
607 if (hp->interface_id != 'S') {
608 sg_remove_request(sfp, srp);
611 if (hp->flags & SG_FLAG_MMAP_IO) {
612 if (hp->dxfer_len > sfp->reserve.bufflen) {
613 sg_remove_request(sfp, srp);
614 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
616 if (hp->flags & SG_FLAG_DIRECT_IO) {
617 sg_remove_request(sfp, srp);
618 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
620 if (sg_res_in_use(sfp)) {
621 sg_remove_request(sfp, srp);
622 return -EBUSY; /* reserve buffer already being used */
625 timeout = sg_ms_to_jif(srp->header.timeout);
626 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
627 sg_remove_request(sfp, srp);
630 if ((k = verify_area(VERIFY_READ, hp->cmdp, hp->cmd_len))) {
631 sg_remove_request(sfp, srp);
632 return k; /* protects following copy_from_user()s + get_user()s */
634 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
635 sg_remove_request(sfp, srp);
639 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
640 sg_remove_request(sfp, srp);
643 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
652 sg_common_write(Sg_fd * sfp, Sg_request * srp,
653 unsigned char *cmnd, int timeout, int blocking)
657 Sg_device *sdp = sfp->parentdp;
658 sg_io_hdr_t *hp = &srp->header;
661 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
663 hp->masked_status = 0;
667 hp->driver_status = 0;
669 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
670 (int) cmnd[0], (int) hp->cmd_len));
672 if ((k = sg_start_req(srp))) {
673 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
674 sg_finish_rem_req(srp);
675 return k; /* probably out of space --> ENOMEM */
677 if ((k = sg_write_xfer(srp))) {
678 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
679 sg_finish_rem_req(srp);
683 sg_finish_rem_req(srp);
686 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
688 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
689 sg_finish_rem_req(srp);
693 srp->my_cmdp = SRpnt;
694 q = SRpnt->sr_device->request_queue;
695 SRpnt->sr_request->rq_disk = sdp->disk;
696 SRpnt->sr_sense_buffer[0] = 0;
697 SRpnt->sr_cmd_len = hp->cmd_len;
698 SRpnt->sr_use_sg = srp->data.k_use_sg;
699 SRpnt->sr_sglist_len = srp->data.sglist_len;
700 SRpnt->sr_bufflen = srp->data.bufflen;
701 SRpnt->sr_underflow = 0;
702 SRpnt->sr_buffer = srp->data.buffer;
703 switch (hp->dxfer_direction) {
704 case SG_DXFER_TO_FROM_DEV:
705 case SG_DXFER_FROM_DEV:
706 SRpnt->sr_data_direction = SCSI_DATA_READ;
708 case SG_DXFER_TO_DEV:
709 SRpnt->sr_data_direction = SCSI_DATA_WRITE;
711 case SG_DXFER_UNKNOWN:
712 SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN;
715 SRpnt->sr_data_direction = SCSI_DATA_NONE;
718 SRpnt->upper_private_data = srp;
719 srp->data.k_use_sg = 0;
720 srp->data.sglist_len = 0;
721 srp->data.bufflen = 0;
722 srp->data.buffer = NULL;
723 hp->duration = jiffies; /* unit jiffies now, millisecs after done */
724 /* Now send everything of to mid-level. The next time we hear about this
725 packet is when sg_cmd_done() is called (i.e. a callback). */
726 scsi_do_req(SRpnt, (void *) cmnd,
727 (void *) SRpnt->sr_buffer, hp->dxfer_len,
728 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
729 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
730 generic_unplug_device(q);
735 sg_ioctl(struct inode *inode, struct file *filp,
736 unsigned int cmd_in, unsigned long arg)
738 int result, val, read_only;
742 unsigned long iflags;
744 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
746 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
747 sdp->disk->disk_name, (int) cmd_in));
748 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
753 int blocking = 1; /* ignore O_NONBLOCK flag */
757 if (!scsi_block_when_processing_errors(sdp->device))
759 result = verify_area(VERIFY_WRITE, (void *) arg,
764 sg_new_write(sfp, (const char *) arg, SZ_SG_IO_HDR,
765 blocking, read_only, &srp);
768 srp->sg_io_owned = 1;
770 result = 0; /* following macro to beat race condition */
771 __wait_event_interruptible(sfp->read_wait,
772 (sdp->detached || sfp->closed || srp->done),
777 return 0; /* request packet dropped already */
781 return result; /* -ERESTARTSYS because signal hit process */
784 result = sg_new_read(sfp, (char *) arg, SZ_SG_IO_HDR, srp);
785 return (result < 0) ? result : 0;
788 result = get_user(val, (int *) arg);
793 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
794 val = MULDIV (INT_MAX, USER_HZ, HZ);
795 sfp->timeout_user = val;
796 sfp->timeout = MULDIV (val, HZ, USER_HZ);
799 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
800 /* strange ..., for backward compatibility */
801 return sfp->timeout_user;
802 case SG_SET_FORCE_LOW_DMA:
803 result = get_user(val, (int *) arg);
808 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
809 val = (int) sfp->reserve.bufflen;
810 sg_remove_scat(&sfp->reserve);
811 sg_build_reserve(sfp, val);
816 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
820 return put_user((int) sfp->low_dma, (int *) arg);
823 verify_area(VERIFY_WRITE, (void *) arg,
824 sizeof (sg_scsi_id_t));
828 sg_scsi_id_t *sg_idp = (sg_scsi_id_t *) arg;
832 __put_user((int) sdp->device->host->host_no,
834 __put_user((int) sdp->device->channel,
836 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
837 __put_user((int) sdp->device->lun, &sg_idp->lun);
838 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
839 __put_user((short) sdp->device->host->cmd_per_lun,
840 &sg_idp->h_cmd_per_lun);
841 __put_user((short) sdp->device->queue_depth,
842 &sg_idp->d_queue_depth);
843 __put_user(0, &sg_idp->unused[0]);
844 __put_user(0, &sg_idp->unused[1]);
847 case SG_SET_FORCE_PACK_ID:
848 result = get_user(val, (int *) arg);
851 sfp->force_packid = val ? 1 : 0;
854 result = verify_area(VERIFY_WRITE, (void *) arg, sizeof (int));
857 read_lock_irqsave(&sfp->rq_list_lock, iflags);
858 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
859 if ((1 == srp->done) && (!srp->sg_io_owned)) {
860 read_unlock_irqrestore(&sfp->rq_list_lock,
862 __put_user(srp->header.pack_id, (int *) arg);
866 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
867 __put_user(-1, (int *) arg);
869 case SG_GET_NUM_WAITING:
870 read_lock_irqsave(&sfp->rq_list_lock, iflags);
871 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
872 if ((1 == srp->done) && (!srp->sg_io_owned))
875 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
876 return put_user(val, (int *) arg);
877 case SG_GET_SG_TABLESIZE:
878 return put_user(sdp->sg_tablesize, (int *) arg);
879 case SG_SET_RESERVED_SIZE:
880 result = get_user(val, (int *) arg);
885 if (val != sfp->reserve.bufflen) {
886 if (sg_res_in_use(sfp) || sfp->mmap_called)
888 sg_remove_scat(&sfp->reserve);
889 sg_build_reserve(sfp, val);
892 case SG_GET_RESERVED_SIZE:
893 val = (int) sfp->reserve.bufflen;
894 return put_user(val, (int *) arg);
895 case SG_SET_COMMAND_Q:
896 result = get_user(val, (int *) arg);
899 sfp->cmd_q = val ? 1 : 0;
901 case SG_GET_COMMAND_Q:
902 return put_user((int) sfp->cmd_q, (int *) arg);
903 case SG_SET_KEEP_ORPHAN:
904 result = get_user(val, (int *) arg);
907 sfp->keep_orphan = val;
909 case SG_GET_KEEP_ORPHAN:
910 return put_user((int) sfp->keep_orphan, (int *) arg);
911 case SG_NEXT_CMD_LEN:
912 result = get_user(val, (int *) arg);
915 sfp->next_cmd_len = (val > 0) ? val : 0;
917 case SG_GET_VERSION_NUM:
918 return put_user(sg_version_num, (int *) arg);
919 case SG_GET_ACCESS_COUNT:
920 /* faked - we don't have a real access count anymore */
921 val = (sdp->device ? 1 : 0);
922 return put_user(val, (int *) arg);
923 case SG_GET_REQUEST_TABLE:
924 result = verify_area(VERIFY_WRITE, (void *) arg,
925 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
929 sg_req_info_t rinfo[SG_MAX_QUEUE];
931 read_lock_irqsave(&sfp->rq_list_lock, iflags);
932 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
933 ++val, srp = srp ? srp->nextrp : srp) {
934 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
936 rinfo[val].req_state = srp->done + 1;
938 srp->header.masked_status &
939 srp->header.host_status &
940 srp->header.driver_status;
941 rinfo[val].duration =
942 srp->done ? srp->header.duration :
944 jiffies - srp->header.duration);
945 rinfo[val].orphan = srp->orphan;
946 rinfo[val].sg_io_owned = srp->sg_io_owned;
947 rinfo[val].pack_id = srp->header.pack_id;
948 rinfo[val].usr_ptr = srp->header.usr_ptr;
951 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
952 return (__copy_to_user((void *) arg, rinfo,
953 SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0);
955 case SG_EMULATED_HOST:
958 return put_user(sdp->device->host->hostt->emulated, (int *) arg);
962 if (filp->f_flags & O_NONBLOCK) {
963 if (test_bit(SHOST_RECOVERY,
964 &sdp->device->host->shost_state))
966 } else if (!scsi_block_when_processing_errors(sdp->device))
968 result = get_user(val, (int *) arg);
971 if (SG_SCSI_RESET_NOTHING == val)
974 case SG_SCSI_RESET_DEVICE:
975 val = SCSI_TRY_RESET_DEVICE;
977 case SG_SCSI_RESET_BUS:
978 val = SCSI_TRY_RESET_BUS;
980 case SG_SCSI_RESET_HOST:
981 val = SCSI_TRY_RESET_HOST;
986 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
988 return (scsi_reset_provider(sdp->device, val) ==
990 case SCSI_IOCTL_SEND_COMMAND:
994 unsigned char opcode = WRITE_6;
995 Scsi_Ioctl_Command *siocp = (void *) arg;
997 if (copy_from_user(&opcode, siocp->data, 1))
999 if (!sg_allow_access(opcode, sdp->device->type))
1002 return scsi_ioctl_send_command(sdp->device, (void *) arg);
1004 result = get_user(val, (int *) arg);
1007 sdp->sgdebug = (char) val;
1009 case SCSI_IOCTL_GET_IDLUN:
1010 case SCSI_IOCTL_GET_BUS_NUMBER:
1011 case SCSI_IOCTL_PROBE_HOST:
1012 case SG_GET_TRANSFORM:
1015 return scsi_ioctl(sdp->device, cmd_in, (void *) arg);
1018 return -EPERM; /* don't know so take safe approach */
1019 return scsi_ioctl(sdp->device, cmd_in, (void *) arg);
1024 sg_poll(struct file *filp, poll_table * wait)
1026 unsigned int res = 0;
1031 unsigned long iflags;
1033 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1036 poll_wait(filp, &sfp->read_wait, wait);
1037 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1038 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1039 /* if any read waiting, flag it */
1040 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1041 res = POLLIN | POLLRDNORM;
1044 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1048 else if (!sfp->cmd_q) {
1050 res |= POLLOUT | POLLWRNORM;
1051 } else if (count < SG_MAX_QUEUE)
1052 res |= POLLOUT | POLLWRNORM;
1053 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1054 sdp->disk->disk_name, (int) res));
1059 sg_fasync(int fd, struct file *filp, int mode)
1065 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1067 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1068 sdp->disk->disk_name, mode));
1070 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1071 return (retval < 0) ? retval : 0;
1074 static inline unsigned char *
1075 sg_scatg2virt(const struct scatterlist *sclp)
1077 return (sclp && sclp->page) ?
1078 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1081 /* When startFinish==1 increments page counts for pages other than the
1082 first of scatter gather elements obtained from __get_free_pages().
1083 When startFinish==0 decrements ... */
1085 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1091 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1092 startFinish, rsv_schp->k_use_sg));
1093 /* N.B. correction _not_ applied to base page of each allocation */
1094 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1095 struct scatterlist *sclp = rsv_schp->buffer;
1097 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1098 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1099 page_ptr = sg_scatg2virt(sclp) + m;
1100 page = virt_to_page(page_ptr);
1102 atomic_inc(&page->count);
1104 if (page_count(page) > 0)
1105 atomic_dec(&page->count);
1109 } else { /* reserve buffer is just a single allocation */
1110 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1111 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1112 page = virt_to_page(page_ptr);
1114 atomic_inc(&page->count);
1116 if (page_count(page) > 0)
1117 atomic_dec(&page->count);
1123 static struct page *
1124 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1127 struct page *page = NOPAGE_SIGBUS;
1128 void *page_ptr = NULL;
1129 unsigned long offset;
1130 Sg_scatter_hold *rsv_schp;
1132 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1134 rsv_schp = &sfp->reserve;
1135 offset = addr - vma->vm_start;
1136 if (offset >= rsv_schp->bufflen)
1138 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1139 offset, rsv_schp->k_use_sg));
1140 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1142 unsigned long sa = vma->vm_start;
1144 struct scatterlist *sclp = rsv_schp->buffer;
1146 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1148 len = vma->vm_end - sa;
1149 len = (len < sclp->length) ? len : sclp->length;
1151 page_ptr = sg_scatg2virt(sclp) + offset;
1152 page = virt_to_page(page_ptr);
1153 get_page(page); /* increment page count */
1159 } else { /* reserve buffer is just a single allocation */
1160 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1161 page = virt_to_page(page_ptr);
1162 get_page(page); /* increment page count */
1165 *type = VM_FAULT_MINOR;
1169 static struct vm_operations_struct sg_mmap_vm_ops = {
1170 .nopage = sg_vma_nopage,
1174 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1177 unsigned long req_sz = vma->vm_end - vma->vm_start;
1178 Sg_scatter_hold *rsv_schp;
1180 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1182 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1183 (void *) vma->vm_start, (int) req_sz));
1185 return -EINVAL; /* want no offset */
1186 rsv_schp = &sfp->reserve;
1187 if (req_sz > rsv_schp->bufflen)
1188 return -ENOMEM; /* cannot map more than reserved buffer */
1190 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1192 unsigned long sa = vma->vm_start;
1194 struct scatterlist *sclp = rsv_schp->buffer;
1196 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1198 if (0 != sclp->offset)
1199 return -EFAULT; /* non page aligned memory ?? */
1200 len = vma->vm_end - sa;
1201 len = (len < sclp->length) ? len : sclp->length;
1204 } else { /* reserve buffer is just a single allocation */
1205 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1206 return -EFAULT; /* non page aligned memory ?? */
1208 if (0 == sfp->mmap_called) {
1209 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1210 sfp->mmap_called = 1;
1212 vma->vm_flags |= (VM_RESERVED | VM_IO);
1213 vma->vm_private_data = sfp;
1214 vma->vm_ops = &sg_mmap_vm_ops;
1218 /* This function is a "bottom half" handler that is called by the
1219 * mid level when a command is completed (or has failed). */
1221 sg_cmd_done(Scsi_Cmnd * SCpnt)
1223 Scsi_Request *SRpnt = NULL;
1224 Sg_device *sdp = NULL;
1226 Sg_request *srp = NULL;
1228 if (SCpnt && (SRpnt = SCpnt->sc_request))
1229 srp = (Sg_request *) SRpnt->upper_private_data;
1231 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1233 scsi_release_request(SRpnt);
1236 sfp = srp->parentfp;
1238 sdp = sfp->parentdp;
1239 if ((NULL == sdp) || sdp->detached) {
1240 printk(KERN_INFO "sg_cmd_done: device detached\n");
1241 scsi_release_request(SRpnt);
1245 /* First transfer ownership of data buffers to sg_device object. */
1246 srp->data.k_use_sg = SRpnt->sr_use_sg;
1247 srp->data.sglist_len = SRpnt->sr_sglist_len;
1248 srp->data.bufflen = SRpnt->sr_bufflen;
1249 srp->data.buffer = SRpnt->sr_buffer;
1250 /* now clear out request structure */
1251 SRpnt->sr_use_sg = 0;
1252 SRpnt->sr_sglist_len = 0;
1253 SRpnt->sr_bufflen = 0;
1254 SRpnt->sr_buffer = NULL;
1255 SRpnt->sr_underflow = 0;
1256 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1258 srp->my_cmdp = NULL;
1260 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1261 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1262 srp->header.resid = SCpnt->resid;
1263 /* N.B. unit of duration changes here from jiffies to millisecs */
1264 srp->header.duration =
1265 sg_jif_to_ms(jiffies - (int) srp->header.duration);
1266 if (0 != SRpnt->sr_result) {
1267 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1268 sizeof (srp->sense_b));
1269 srp->header.status = 0xff & SRpnt->sr_result;
1270 srp->header.masked_status = status_byte(SRpnt->sr_result);
1271 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1272 srp->header.host_status = host_byte(SRpnt->sr_result);
1273 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1274 if ((sdp->sgdebug > 0) &&
1275 ((CHECK_CONDITION == srp->header.masked_status) ||
1276 (COMMAND_TERMINATED == srp->header.masked_status)))
1277 print_req_sense("sg_cmd_done", SRpnt);
1279 /* Following if statement is a patch supplied by Eric Youngdale */
1280 if (driver_byte(SRpnt->sr_result) != 0
1281 && (SRpnt->sr_sense_buffer[0] & 0x7f) == 0x70
1282 && (SRpnt->sr_sense_buffer[2] & 0xf) == UNIT_ATTENTION
1283 && sdp->device->removable) {
1284 /* Detected disc change. Set the bit - this may be used if */
1285 /* there are filesystems using this device. */
1286 sdp->device->changed = 1;
1289 /* Rely on write phase to clean out srp status values, so no "else" */
1291 scsi_release_request(SRpnt);
1293 if (sfp->closed) { /* whoops this fd already released, cleanup */
1294 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1295 sg_finish_rem_req(srp);
1297 if (NULL == sfp->headrp) {
1298 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1299 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1300 scsi_device_put(sdp->device);
1304 } else if (srp && srp->orphan) {
1305 if (sfp->keep_orphan)
1306 srp->sg_io_owned = 0;
1308 sg_finish_rem_req(srp);
1313 /* Now wake up any sg_read() that is waiting for this packet. */
1314 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1316 wake_up_interruptible(&sfp->read_wait);
1320 static struct file_operations sg_fops = {
1321 .owner = THIS_MODULE,
1328 .release = sg_release,
1329 .fasync = sg_fasync,
1332 static struct class_simple * sg_sysfs_class;
1334 static int sg_sysfs_valid = 0;
1337 sg_add(struct class_device *cl_dev)
1339 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1340 struct gendisk *disk;
1341 Sg_device *sdp = NULL;
1342 unsigned long iflags;
1343 struct cdev * cdev = NULL;
1346 disk = alloc_disk(1);
1350 cdev = cdev_alloc();
1353 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1354 if (sg_nr_dev >= sg_dev_max) { /* try to resize */
1356 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1358 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1359 tmp_da = (Sg_device **)vmalloc(
1360 tmp_dev_max * sizeof(Sg_device *));
1361 if (NULL == tmp_da) {
1363 "sg_add: device array cannot be resized\n");
1367 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1368 memset(tmp_da, 0, tmp_dev_max * sizeof (Sg_device *));
1369 memcpy(tmp_da, sg_dev_arr,
1370 sg_dev_max * sizeof (Sg_device *));
1371 vfree((char *) sg_dev_arr);
1372 sg_dev_arr = tmp_da;
1373 sg_dev_max = tmp_dev_max;
1377 for (k = 0; k < sg_dev_max; k++)
1380 if (k >= SG_MAX_DEVS) {
1381 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1383 "Unable to attach sg device <%d, %d, %d, %d>"
1384 " type=%d, minor number exceeds %d\n",
1385 scsidp->host->host_no, scsidp->channel, scsidp->id,
1386 scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
1388 vfree((char *) sdp);
1392 if (k < sg_dev_max) {
1394 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1395 sdp = (Sg_device *)vmalloc(sizeof(Sg_device));
1396 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1398 goto find_empty_slot;
1403 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1404 printk(KERN_ERR "sg_add: Sg_device cannot be allocated\n");
1409 SCSI_LOG_TIMEOUT(3, printk("sg_add: dev=%d \n", k));
1410 memset(sdp, 0, sizeof(*sdp));
1411 sprintf(disk->disk_name, "sg%d", k);
1412 cdev->owner = THIS_MODULE;
1413 cdev->ops = &sg_fops;
1414 disk->major = SCSI_GENERIC_MAJOR;
1415 disk->first_minor = k;
1417 sdp->device = scsidp;
1418 init_waitqueue_head(&sdp->o_excl_wait);
1419 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1422 sg_dev_arr[k] = sdp;
1423 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1425 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1426 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1427 "%s/generic", scsidp->devfs_name);
1428 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1430 devfs_remove("%s/generic", scsidp->devfs_name);
1434 if (sg_sysfs_valid) {
1435 struct class_device * sg_class_member;
1437 sg_class_member = class_simple_device_add(sg_sysfs_class,
1438 MKDEV(SCSI_GENERIC_MAJOR, k),
1441 if (IS_ERR(sg_class_member))
1442 printk(KERN_WARNING "sg_add: "
1443 "class_simple_device_add failed\n");
1444 class_set_devdata(sg_class_member, sdp);
1445 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1446 &sg_class_member->kobj, "generic");
1448 printk(KERN_ERR "sg_add: unable to make symlink "
1449 "'generic' back to sg%d\n", k);
1451 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1454 "Attached scsi generic sg%d at scsi%d, channel"
1455 " %d, id %d, lun %d, type %d\n", k,
1456 scsidp->host->host_no, scsidp->channel, scsidp->id,
1457 scsidp->lun, scsidp->type);
1469 sg_remove(struct class_device *cl_dev)
1471 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1472 Sg_device *sdp = NULL;
1473 unsigned long iflags;
1480 if (NULL == sg_dev_arr)
1483 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1484 for (k = 0; k < sg_dev_max; k++) {
1485 sdp = sg_dev_arr[k];
1486 if ((NULL == sdp) || (sdp->device != scsidp))
1487 continue; /* dirty but lowers nesting */
1490 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1492 for (srp = sfp->headrp; srp; srp = tsrp) {
1494 if (sfp->closed || (0 == srp->done))
1495 sg_finish_rem_req(srp);
1498 scsi_device_put(sdp->device);
1499 __sg_remove_sfp(sdp, sfp);
1502 wake_up_interruptible(&sfp->read_wait);
1503 kill_fasync(&sfp->async_qp, SIGPOLL,
1507 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1508 if (NULL == sdp->headfp) {
1509 sg_dev_arr[k] = NULL;
1511 } else { /* nothing active, simple case */
1512 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1513 sg_dev_arr[k] = NULL;
1518 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1521 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1522 class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k));
1523 cdev_del(sdp->cdev);
1525 devfs_remove("%s/generic", scsidp->devfs_name);
1526 put_disk(sdp->disk);
1528 if (NULL == sdp->headfp)
1529 vfree((char *) sdp);
1533 scsi_sleep(2); /* dirty detach so delay device destruction */
1536 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1537 * of sysfs parameters (which module_param doesn't yet support).
1538 * Sysfs parameters defined explicitly below.
1540 module_param_named(def_reserved_size, def_reserved_size, int, 0);
1541 module_param_named(allow_dio, sg_allow_dio, int, 0);
1543 MODULE_AUTHOR("Douglas Gilbert");
1544 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1545 MODULE_LICENSE("GPL");
1547 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1548 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1555 if (def_reserved_size >= 0)
1556 sg_big_buff = def_reserved_size;
1558 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1562 sg_sysfs_class = class_simple_create(THIS_MODULE, "scsi_generic");
1563 if ( IS_ERR(sg_sysfs_class) ) {
1564 rc = PTR_ERR(sg_sysfs_class);
1568 rc = scsi_register_interface(&sg_interface);
1570 #ifdef CONFIG_SCSI_PROC_FS
1572 #endif /* CONFIG_SCSI_PROC_FS */
1575 class_simple_destroy(sg_sysfs_class);
1577 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1584 #ifdef CONFIG_SCSI_PROC_FS
1586 #endif /* CONFIG_SCSI_PROC_FS */
1587 scsi_unregister_interface(&sg_interface);
1588 class_simple_destroy(sg_sysfs_class);
1590 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1592 if (sg_dev_arr != NULL) {
1593 vfree((char *) sg_dev_arr);
1600 sg_start_req(Sg_request * srp)
1603 Sg_fd *sfp = srp->parentfp;
1604 sg_io_hdr_t *hp = &srp->header;
1605 int dxfer_len = (int) hp->dxfer_len;
1606 int dxfer_dir = hp->dxfer_direction;
1607 Sg_scatter_hold *req_schp = &srp->data;
1608 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1610 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1611 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1613 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1614 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1615 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1616 res = sg_build_direct(srp, sfp, dxfer_len);
1617 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1620 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1621 sg_link_reserve(sfp, srp, dxfer_len);
1623 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1625 sg_remove_scat(req_schp);
1633 sg_finish_rem_req(Sg_request * srp)
1635 Sg_fd *sfp = srp->parentfp;
1636 Sg_scatter_hold *req_schp = &srp->data;
1638 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1640 sg_unlink_reserve(sfp, srp);
1642 sg_remove_scat(req_schp);
1643 sg_remove_request(sfp, srp);
1647 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1650 int elem_sz = sizeof (struct scatterlist);
1651 int sg_bufflen = tablesize * elem_sz;
1652 int mx_sc_elems = tablesize;
1654 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1657 else if (ret_sz != sg_bufflen) {
1658 sg_bufflen = ret_sz;
1659 mx_sc_elems = sg_bufflen / elem_sz;
1661 schp->sglist_len = sg_bufflen;
1662 memset(schp->buffer, 0, sg_bufflen);
1663 return mx_sc_elems; /* number of scat_gath elements allocated */
1666 #ifdef SG_ALLOW_DIO_CODE
1667 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1668 /* hopefully this generic code will moved to a library */
1670 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1671 - mapping of all pages not successful
1672 - any page is above max_pfn
1673 (i.e., either completely successful or fails)
1676 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1677 unsigned long uaddr, size_t count, int rw,
1678 unsigned long max_pfn)
1681 unsigned int nr_pages;
1682 struct page **pages;
1684 nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
1686 /* User attempted Overflow! */
1687 if ((uaddr + count) < uaddr)
1691 if (nr_pages > max_pages)
1698 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1701 /* Try to fault in all of the necessary pages */
1702 down_read(¤t->mm->mmap_sem);
1703 /* rw==READ means read from drive, write into memory area */
1704 res = get_user_pages(
1710 0, /* don't force */
1713 up_read(¤t->mm->mmap_sem);
1715 /* Errors and no page mapped should return here */
1719 for (i=0; i < nr_pages; i++) {
1720 /* FIXME: flush superflous for rw==READ,
1721 * probably wrong function for rw==WRITE
1723 flush_dcache_page(pages[i]);
1724 if (page_to_pfn(pages[i]) > max_pfn)
1726 /* ?? Is locking needed? I don't think so */
1727 /* if (TestSetPageLocked(pages[i]))
1731 /* Populate the scatter/gather list */
1732 sgl[0].page = pages[0];
1733 sgl[0].offset = uaddr & ~PAGE_MASK;
1735 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1736 count -= sgl[0].length;
1737 for (i=1; i < nr_pages ; i++) {
1739 sgl[i].page = pages[i];
1740 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1745 sgl[0].length = count;
1752 /* for (j=0; j < i; j++)
1753 unlock_page(pages[j]); */
1757 for (j=0; j < res; j++)
1758 page_cache_release(pages[j]);
1764 /* And unmap them... */
1766 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1771 for (i=0; i < nr_pages; i++) {
1772 if (dirtied && !PageReserved(sgl[i].page))
1773 SetPageDirty(sgl[i].page);
1774 /* unlock_page(sgl[i].page); */
1775 /* FIXME: cache flush missing for rw==READ
1776 * FIXME: call the correct reference counting function
1778 page_cache_release(sgl[i].page);
1784 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1788 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1790 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1792 #ifdef SG_ALLOW_DIO_CODE
1793 sg_io_hdr_t *hp = &srp->header;
1794 Sg_scatter_hold *schp = &srp->data;
1795 int sg_tablesize = sfp->parentdp->sg_tablesize;
1796 struct scatterlist *sgl;
1797 int mx_sc_elems, res;
1798 struct scsi_device *sdev = sfp->parentdp->device;
1800 if (((unsigned long)hp->dxferp &
1801 queue_dma_alignment(sdev->request_queue)) != 0)
1803 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1804 if (mx_sc_elems <= 0) {
1807 sgl = (struct scatterlist *)schp->buffer;
1808 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1809 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1812 schp->k_use_sg = res;
1813 schp->dio_in_use = 1;
1814 hp->info |= SG_INFO_DIRECT_IO;
1822 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1825 int blk_size = buff_size;
1826 unsigned char *p = NULL;
1828 if ((blk_size < 0) || (!sfp))
1831 ++blk_size; /* don't know why */
1832 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1833 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1834 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1835 buff_size, blk_size));
1836 if (blk_size <= SG_SCATTER_SZ) {
1837 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1840 if (blk_size == ret_sz) { /* got it on the first attempt */
1843 schp->bufflen = blk_size;
1844 schp->b_malloc_len = blk_size;
1848 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1852 /* Want some local declarations, so start new block ... */
1853 { /* lets try and build a scatter gather list */
1854 struct scatterlist *sclp;
1857 int sg_tablesize = sfp->parentdp->sg_tablesize;
1860 /* N.B. ret_sz carried into this block ... */
1861 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1862 if (mx_sc_elems < 0)
1863 return mx_sc_elems; /* most likely -ENOMEM */
1865 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1866 (rem_sz > 0) && (k < mx_sc_elems);
1867 ++k, rem_sz -= ret_sz, ++sclp) {
1873 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1874 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1878 sclp->page = virt_to_page(p);
1879 sclp->offset = offset_in_page(p);
1880 sclp->length = ret_sz;
1882 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1883 k, sg_scatg2virt(sclp), ret_sz));
1884 } /* end of for loop */
1886 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1887 schp->bufflen = blk_size;
1888 if (rem_sz > 0) /* must have failed */
1895 sg_write_xfer(Sg_request * srp)
1897 sg_io_hdr_t *hp = &srp->header;
1898 Sg_scatter_hold *schp = &srp->data;
1900 int j, k, onum, usglen, ksglen, res;
1901 int iovec_count = (int) hp->iovec_count;
1902 int dxfer_dir = hp->dxfer_direction;
1905 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1907 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1908 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1909 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1910 if (schp->bufflen < num_xfer)
1911 num_xfer = schp->bufflen;
1913 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1915 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1918 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1919 num_xfer, iovec_count, schp->k_use_sg));
1922 if ((k = verify_area(VERIFY_READ, hp->dxferp,
1923 SZ_SG_IOVEC * onum)))
1928 if (0 == schp->k_use_sg) { /* kernel has single buffer */
1929 for (j = 0, p = schp->buffer; j < onum; ++j) {
1930 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1933 usglen = (num_xfer > usglen) ? usglen : num_xfer;
1934 if (__copy_from_user(p, up, usglen))
1941 } else { /* kernel using scatter gather list */
1942 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
1944 ksglen = (int) sclp->length;
1945 p = sg_scatg2virt(sclp);
1946 for (j = 0, k = 0; j < onum; ++j) {
1947 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1951 for (; p; ++sclp, ksglen = (int) sclp->length,
1952 p = sg_scatg2virt(sclp)) {
1955 if (ksglen > usglen) {
1956 if (usglen >= num_xfer) {
1957 if (__copy_from_user
1962 if (__copy_from_user(p, up, usglen))
1968 if (ksglen >= num_xfer) {
1969 if (__copy_from_user
1974 if (__copy_from_user(p, up, ksglen))
1980 if (k >= schp->k_use_sg)
1989 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1990 int wr_xf, int *countp, unsigned char **up)
1992 int num_xfer = (int) hp->dxfer_len;
1998 p = (unsigned char *) hp->dxferp;
1999 if (wr_xf && ('\0' == hp->interface_id))
2000 count = (int) hp->flags; /* holds "old" input_size */
2004 if (__copy_from_user(&u_iovec,
2005 (unsigned char *) hp->dxferp +
2006 (ind * SZ_SG_IOVEC), SZ_SG_IOVEC))
2008 p = (unsigned char *) u_iovec.iov_base;
2009 count = (int) u_iovec.iov_len;
2011 if ((k = verify_area(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)))
2021 sg_remove_scat(Sg_scatter_hold * schp)
2023 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2024 if (schp->buffer && (schp->sglist_len > 0)) {
2025 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2027 if (schp->dio_in_use) {
2028 #ifdef SG_ALLOW_DIO_CODE
2029 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2034 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2036 SCSI_LOG_TIMEOUT(5, printk(
2037 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2038 k, sg_scatg2virt(sclp), sclp->length));
2039 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2045 sg_page_free(schp->buffer, schp->sglist_len);
2046 } else if (schp->buffer)
2047 sg_page_free(schp->buffer, schp->b_malloc_len);
2048 memset(schp, 0, sizeof (*schp));
2052 sg_read_xfer(Sg_request * srp)
2054 sg_io_hdr_t *hp = &srp->header;
2055 Sg_scatter_hold *schp = &srp->data;
2057 int j, k, onum, usglen, ksglen, res;
2058 int iovec_count = (int) hp->iovec_count;
2059 int dxfer_dir = hp->dxfer_direction;
2062 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2064 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2065 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2066 num_xfer = hp->dxfer_len;
2067 if (schp->bufflen < num_xfer)
2068 num_xfer = schp->bufflen;
2070 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2072 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2075 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2076 num_xfer, iovec_count, schp->k_use_sg));
2079 if ((k = verify_area(VERIFY_READ, hp->dxferp,
2080 SZ_SG_IOVEC * onum)))
2085 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2086 for (j = 0, p = schp->buffer; j < onum; ++j) {
2087 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2090 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2091 if (__copy_to_user(up, p, usglen))
2098 } else { /* kernel using scatter gather list */
2099 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2101 ksglen = (int) sclp->length;
2102 p = sg_scatg2virt(sclp);
2103 for (j = 0, k = 0; j < onum; ++j) {
2104 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2108 for (; p; ++sclp, ksglen = (int) sclp->length,
2109 p = sg_scatg2virt(sclp)) {
2112 if (ksglen > usglen) {
2113 if (usglen >= num_xfer) {
2119 if (__copy_to_user(up, p, usglen))
2125 if (ksglen >= num_xfer) {
2131 if (__copy_to_user(up, p, ksglen))
2137 if (k >= schp->k_use_sg)
2146 sg_read_oxfer(Sg_request * srp, char *outp, int num_read_xfer)
2148 Sg_scatter_hold *schp = &srp->data;
2150 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2152 if ((!outp) || (num_read_xfer <= 0))
2154 if (schp->k_use_sg > 0) {
2156 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2158 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2160 num = (int) sclp->length;
2161 if (num > num_read_xfer) {
2163 (outp, sg_scatg2virt(sclp), num_read_xfer))
2168 (outp, sg_scatg2virt(sclp), num))
2170 num_read_xfer -= num;
2171 if (num_read_xfer <= 0)
2177 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2184 sg_build_reserve(Sg_fd * sfp, int req_size)
2186 Sg_scatter_hold *schp = &sfp->reserve;
2188 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2190 if (req_size < PAGE_SIZE)
2191 req_size = PAGE_SIZE;
2192 if (0 == sg_build_indirect(schp, sfp, req_size))
2195 sg_remove_scat(schp);
2196 req_size >>= 1; /* divide by 2 */
2197 } while (req_size > (PAGE_SIZE / 2));
2201 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2203 Sg_scatter_hold *req_schp = &srp->data;
2204 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2207 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2208 size = (size + 1) & (~1); /* round to even for aha1542 */
2209 if (rsv_schp->k_use_sg > 0) {
2212 struct scatterlist *sclp =
2213 (struct scatterlist *) rsv_schp->buffer;
2215 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2216 num = (int) sclp->length;
2219 req_schp->k_use_sg = 0;
2220 req_schp->buffer = sg_scatg2virt(sclp);
2222 sfp->save_scat_len = num;
2223 sclp->length = (unsigned) rem;
2224 req_schp->k_use_sg = k + 1;
2225 req_schp->sglist_len =
2226 rsv_schp->sglist_len;
2227 req_schp->buffer = rsv_schp->buffer;
2229 req_schp->bufflen = size;
2230 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2235 if (k >= rsv_schp->k_use_sg)
2236 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2238 req_schp->k_use_sg = 0;
2239 req_schp->bufflen = size;
2240 req_schp->buffer = rsv_schp->buffer;
2241 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2246 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2248 Sg_scatter_hold *req_schp = &srp->data;
2249 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2251 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2252 (int) req_schp->k_use_sg));
2253 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2254 struct scatterlist *sclp =
2255 (struct scatterlist *) rsv_schp->buffer;
2257 if (sfp->save_scat_len > 0)
2258 (sclp + (req_schp->k_use_sg - 1))->length =
2259 (unsigned) sfp->save_scat_len;
2261 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2263 req_schp->k_use_sg = 0;
2264 req_schp->bufflen = 0;
2265 req_schp->buffer = NULL;
2266 req_schp->sglist_len = 0;
2267 sfp->save_scat_len = 0;
2272 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2275 unsigned long iflags;
2277 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2278 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2279 /* look for requests that are ready + not SG_IO owned */
2280 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2281 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2282 resp->done = 2; /* guard against other readers */
2286 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2290 #ifdef CONFIG_SCSI_PROC_FS
2292 sg_get_nth_request(Sg_fd * sfp, int nth)
2295 unsigned long iflags;
2298 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2299 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2300 ++k, resp = resp->nextrp) ;
2301 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2306 /* always adds to end of list */
2308 sg_add_request(Sg_fd * sfp)
2311 unsigned long iflags;
2313 Sg_request *rp = sfp->req_arr;
2315 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2318 memset(rp, 0, sizeof (Sg_request));
2323 if (0 == sfp->cmd_q)
2324 resp = NULL; /* command queuing disallowed */
2326 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2330 if (k < SG_MAX_QUEUE) {
2331 memset(rp, 0, sizeof (Sg_request));
2333 while (resp->nextrp)
2334 resp = resp->nextrp;
2342 resp->nextrp = NULL;
2343 resp->header.duration = jiffies;
2344 resp->my_cmdp = NULL;
2346 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2350 /* Return of 1 for found; 0 for not found */
2352 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2354 Sg_request *prev_rp;
2356 unsigned long iflags;
2359 if ((!sfp) || (!srp) || (!sfp->headrp))
2361 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2362 prev_rp = sfp->headrp;
2363 if (srp == prev_rp) {
2364 sfp->headrp = prev_rp->nextrp;
2365 prev_rp->parentfp = NULL;
2368 while ((rp = prev_rp->nextrp)) {
2370 prev_rp->nextrp = rp->nextrp;
2371 rp->parentfp = NULL;
2378 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2382 #ifdef CONFIG_SCSI_PROC_FS
2384 sg_get_nth_sfp(Sg_device * sdp, int nth)
2387 unsigned long iflags;
2390 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2391 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2392 ++k, resp = resp->nextfp) ;
2393 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2399 sg_add_sfp(Sg_device * sdp, int dev)
2402 unsigned long iflags;
2404 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, 0);
2407 memset(sfp, 0, sizeof (Sg_fd));
2408 init_waitqueue_head(&sfp->read_wait);
2409 sfp->rq_list_lock = RW_LOCK_UNLOCKED;
2411 sfp->timeout = SG_DEFAULT_TIMEOUT;
2412 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2413 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2414 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2415 sdp->device->host->unchecked_isa_dma : 1;
2416 sfp->cmd_q = SG_DEF_COMMAND_Q;
2417 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2418 sfp->parentdp = sdp;
2419 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2422 else { /* add to tail of existing list */
2423 Sg_fd *pfp = sdp->headfp;
2428 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2429 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2430 sg_build_reserve(sfp, sg_big_buff);
2431 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2432 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2437 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2442 prev_fp = sdp->headfp;
2444 sdp->headfp = prev_fp->nextfp;
2446 while ((fp = prev_fp->nextfp)) {
2448 prev_fp->nextfp = fp->nextfp;
2454 if (sfp->reserve.bufflen > 0) {
2456 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2457 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2458 if (sfp->mmap_called)
2459 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2460 sg_remove_scat(&sfp->reserve);
2462 sfp->parentdp = NULL;
2463 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2464 sg_page_free((char *) sfp, sizeof (Sg_fd));
2467 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2469 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2476 for (srp = sfp->headrp; srp; srp = tsrp) {
2479 sg_finish_rem_req(srp);
2484 unsigned long iflags;
2486 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2487 __sg_remove_sfp(sdp, sfp);
2488 if (sdp->detached && (NULL == sdp->headfp)) {
2492 for (k = 0; k < maxd; ++k) {
2493 if (sdp == sg_dev_arr[k])
2497 sg_dev_arr[k] = NULL;
2498 vfree((char *) sdp);
2501 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2503 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2504 /* only bump the access_count if we actually succeeded in
2505 * throwing another counter on the host module */
2506 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2507 sfp->closed = 1; /* flag dirty state on this fd */
2508 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2515 sg_res_in_use(Sg_fd * sfp)
2517 const Sg_request *srp;
2518 unsigned long iflags;
2520 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2521 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2524 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2528 /* If retSzp==NULL want exact size or fail */
2530 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2541 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2543 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2545 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2546 order++, a_size <<= 1) ;
2547 resp = (char *) __get_free_pages(page_mask, order);
2548 while ((!resp) && order && retSzp) {
2550 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2551 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2555 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2556 memset(resp, 0, resSz);
2564 sg_page_free(char *buff, int size)
2570 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2571 order++, a_size <<= 1) ;
2572 free_pages((unsigned long) buff, order);
2576 sg_ms_to_jif(unsigned int msecs)
2578 if ((UINT_MAX / 2U) < msecs)
2579 return INT_MAX; /* special case, set largest possible */
2581 return ((int) msecs <
2582 (INT_MAX / 1000)) ? (((int) msecs * HZ) / 1000)
2583 : (((int) msecs / 1000) * HZ);
2586 static inline unsigned
2587 sg_jif_to_ms(int jifs)
2592 unsigned int j = (unsigned int) jifs;
2594 (UINT_MAX / 1000)) ? ((j * 1000) / HZ) : ((j / HZ) *
2599 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2600 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2601 MODE_SENSE, MODE_SENSE_10, LOG_SENSE
2605 sg_allow_access(unsigned char opcode, char dev_type)
2609 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2611 for (k = 0; k < sizeof (allow_ops); ++k) {
2612 if (opcode == allow_ops[k])
2618 #ifdef CONFIG_SCSI_PROC_FS
2623 unsigned long iflags;
2625 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2626 for (k = sg_dev_max - 1; k >= 0; --k)
2627 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2629 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2630 return k + 1; /* origin 1 */
2637 Sg_device *sdp = NULL;
2638 unsigned long iflags;
2640 if (sg_dev_arr && (dev >= 0)) {
2641 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2642 if (dev < sg_dev_max)
2643 sdp = sg_dev_arr[dev];
2644 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2649 #ifdef CONFIG_SCSI_PROC_FS
2651 static struct proc_dir_entry *sg_proc_sgp = NULL;
2653 static char sg_proc_sg_dirname[] = "scsi/sg";
2655 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2657 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2658 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2659 size_t count, loff_t *off);
2660 static struct file_operations adio_fops = {
2661 /* .owner, .read and .llseek added in sg_proc_init() */
2662 .open = sg_proc_single_open_adio,
2663 .write = sg_proc_write_adio,
2664 .release = single_release,
2667 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2668 static ssize_t sg_proc_write_dressz(struct file *filp,
2669 const char __user *buffer, size_t count, loff_t *off);
2670 static struct file_operations dressz_fops = {
2671 .open = sg_proc_single_open_dressz,
2672 .write = sg_proc_write_dressz,
2673 .release = single_release,
2676 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2677 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2678 static struct file_operations version_fops = {
2679 .open = sg_proc_single_open_version,
2680 .release = single_release,
2683 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2684 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2685 static struct file_operations devhdr_fops = {
2686 .open = sg_proc_single_open_devhdr,
2687 .release = single_release,
2690 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2691 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2692 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2693 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2694 static void dev_seq_stop(struct seq_file *s, void *v);
2695 static struct file_operations dev_fops = {
2696 .open = sg_proc_open_dev,
2697 .release = seq_release,
2699 static struct seq_operations dev_seq_ops = {
2700 .start = dev_seq_start,
2701 .next = dev_seq_next,
2702 .stop = dev_seq_stop,
2703 .show = sg_proc_seq_show_dev,
2706 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2707 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2708 static struct file_operations devstrs_fops = {
2709 .open = sg_proc_open_devstrs,
2710 .release = seq_release,
2712 static struct seq_operations devstrs_seq_ops = {
2713 .start = dev_seq_start,
2714 .next = dev_seq_next,
2715 .stop = dev_seq_stop,
2716 .show = sg_proc_seq_show_devstrs,
2719 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2720 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2721 static struct file_operations debug_fops = {
2722 .open = sg_proc_open_debug,
2723 .release = seq_release,
2725 static struct seq_operations debug_seq_ops = {
2726 .start = dev_seq_start,
2727 .next = dev_seq_next,
2728 .stop = dev_seq_stop,
2729 .show = sg_proc_seq_show_debug,
2733 struct sg_proc_leaf {
2735 struct file_operations * fops;
2738 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2739 {"allow_dio", &adio_fops},
2740 {"debug", &debug_fops},
2741 {"def_reserved_size", &dressz_fops},
2742 {"device_hdr", &devhdr_fops},
2743 {"devices", &dev_fops},
2744 {"device_strs", &devstrs_fops},
2745 {"version", &version_fops}
2753 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2754 struct proc_dir_entry *pdep;
2755 struct sg_proc_leaf * leaf;
2757 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
2758 S_IFDIR | S_IRUGO | S_IXUGO, NULL);
2761 for (k = 0; k < num_leaves; ++k) {
2762 leaf = &sg_proc_leaf_arr[k];
2763 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2764 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2766 leaf->fops->owner = THIS_MODULE,
2767 leaf->fops->read = seq_read,
2768 leaf->fops->llseek = seq_lseek,
2769 pdep->proc_fops = leaf->fops;
2776 sg_proc_cleanup(void)
2780 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2784 for (k = 0; k < num_leaves; ++k)
2785 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2786 remove_proc_entry(sg_proc_sg_dirname, NULL);
2790 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2792 seq_printf(s, "%d\n", *((int *)s->private));
2796 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2798 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2802 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2803 size_t count, loff_t *off)
2808 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2810 num = (count < 10) ? count : 10;
2811 if (copy_from_user(buff, buffer, num))
2814 sg_allow_dio = simple_strtoul(buff, 0, 10) ? 1 : 0;
2818 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2820 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2824 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2825 size_t count, loff_t *off)
2828 unsigned long k = ULONG_MAX;
2831 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2833 num = (count < 10) ? count : 10;
2834 if (copy_from_user(buff, buffer, num))
2837 k = simple_strtoul(buff, 0, 10);
2838 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2845 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2847 seq_printf(s, "%d\t%s\n", sg_version_num, sg_version_str);
2851 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2853 return single_open(file, sg_proc_seq_show_version, NULL);
2856 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2858 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2863 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2865 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2868 struct sg_proc_deviter {
2873 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2875 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2879 if (NULL == sg_dev_arr)
2882 it->max = sg_last_dev();
2883 if (it->index >= it->max)
2891 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2893 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2896 return (it->index < it->max) ? it : NULL;
2899 static void dev_seq_stop(struct seq_file *s, void *v)
2904 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2906 return seq_open(file, &dev_seq_ops);
2909 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2911 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2913 struct scsi_device *scsidp;
2915 sdp = it ? sg_get_dev(it->index) : NULL;
2916 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2917 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2918 scsidp->host->host_no, scsidp->channel,
2919 scsidp->id, scsidp->lun, (int) scsidp->type,
2921 (int) scsidp->queue_depth,
2922 (int) scsidp->device_busy,
2923 (int) scsi_device_online(scsidp));
2925 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2929 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2931 return seq_open(file, &devstrs_seq_ops);
2934 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2936 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2938 struct scsi_device *scsidp;
2940 sdp = it ? sg_get_dev(it->index) : NULL;
2941 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2942 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2943 scsidp->vendor, scsidp->model, scsidp->rev);
2945 seq_printf(s, "<no active device>\n");
2949 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2951 int k, m, new_interface, blen, usg;
2954 const sg_io_hdr_t *hp;
2957 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2958 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2959 "(res)sgat=%d low_dma=%d\n", k + 1,
2960 sg_jif_to_ms(fp->timeout),
2961 fp->reserve.bufflen,
2962 (int) fp->reserve.k_use_sg,
2964 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2965 (int) fp->cmd_q, (int) fp->force_packid,
2966 (int) fp->keep_orphan, (int) fp->closed);
2967 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2969 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2970 if (srp->res_used) {
2971 if (new_interface &&
2972 (SG_FLAG_MMAP_IO & hp->flags))
2977 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2983 blen = srp->my_cmdp ?
2984 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
2985 usg = srp->my_cmdp ?
2986 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
2987 seq_printf(s, srp->done ?
2988 ((1 == srp->done) ? "rcv:" : "fin:")
2989 : (srp->my_cmdp ? "act:" : "prior:"));
2990 seq_printf(s, " id=%d blen=%d",
2991 srp->header.pack_id, blen);
2993 seq_printf(s, " dur=%d", hp->duration);
2995 seq_printf(s, " t_o/elap=%d/%d",
2996 new_interface ? hp->timeout : sg_jif_to_ms(fp->timeout),
2997 sg_jif_to_ms(hp->duration ? (jiffies - hp->duration) : 0));
2998 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2999 (int) srp->data.cmd_opcode);
3002 seq_printf(s, " No requests active\n");
3006 static int sg_proc_open_debug(struct inode *inode, struct file *file)
3008 return seq_open(file, &debug_seq_ops);
3011 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3013 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3016 if (it && (0 == it->index)) {
3017 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3018 "(origin 1)\n", sg_dev_max, (int)it->max);
3019 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3021 sdp = it ? sg_get_dev(it->index) : NULL;
3023 struct scsi_device *scsidp = sdp->device;
3025 if (NULL == scsidp) {
3026 seq_printf(s, "device %d detached ??\n",
3031 if (sg_get_nth_sfp(sdp, 0)) {
3032 seq_printf(s, " >>> device=%s ",
3033 sdp->disk->disk_name);
3035 seq_printf(s, "detached pending close ");
3038 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3039 scsidp->host->host_no,
3040 scsidp->channel, scsidp->id,
3042 scsidp->host->hostt->emulated);
3043 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3044 sdp->sg_tablesize, sdp->exclude);
3046 sg_proc_debug_helper(s, sdp);
3051 #endif /* CONFIG_SCSI_PROC_FS */
3053 module_init(init_sg);
3054 module_exit(exit_sg);
3055 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);