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 - 2005 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)
21 static int sg_version_num = 30532; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.32"
25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
28 * (otherwise the macros compile to empty statements).
31 #include <linux/config.h>
32 #include <linux/module.h>
35 #include <linux/kernel.h>
36 #include <linux/sched.h>
37 #include <linux/string.h>
39 #include <linux/errno.h>
40 #include <linux/mtio.h>
41 #include <linux/ioctl.h>
42 #include <linux/fcntl.h>
43 #include <linux/init.h>
44 #include <linux/poll.h>
45 #include <linux/smp_lock.h>
46 #include <linux/moduleparam.h>
47 #include <linux/devfs_fs_kernel.h>
48 #include <linux/cdev.h>
49 #include <linux/seq_file.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_host.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_ioctl.h>
60 #include "scsi_logging.h"
62 #ifdef CONFIG_SCSI_PROC_FS
63 #include <linux/proc_fs.h>
64 static char *sg_version_date = "20050117";
66 static int sg_proc_init(void);
67 static void sg_proc_cleanup(void);
70 #ifndef LINUX_VERSION_CODE
71 #include <linux/version.h>
72 #endif /* LINUX_VERSION_CODE */
74 #define SG_ALLOW_DIO_DEF 0
75 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
77 #define SG_MAX_DEVS 32768
80 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
81 * Then when using 32 bit integers x * m may overflow during the calculation.
82 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
83 * calculates the same, but prevents the overflow when both m and d
84 * are "small" numbers (like HZ and USER_HZ).
85 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
88 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
90 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
92 int sg_big_buff = SG_DEF_RESERVED_SIZE;
93 /* N.B. This variable is readable and writeable via
94 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
95 of this size (or less if there is not enough memory) will be reserved
96 for use by this file descriptor. [Deprecated usage: this variable is also
97 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
98 the kernel (i.e. it is not a module).] */
99 static int def_reserved_size = -1; /* picks up init parameter */
100 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
102 #define SG_SECTOR_SZ 512
103 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
105 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
107 static int sg_add(struct class_device *);
108 static void sg_remove(struct class_device *);
110 static Scsi_Request *dummy_cmdp; /* only used for sizeof */
112 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
113 file descriptor list for device */
115 static struct class_interface sg_interface = {
120 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
121 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
122 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
123 unsigned bufflen; /* Size of (aggregate) data buffer */
124 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
125 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
126 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
127 unsigned char cmd_opcode; /* first byte of command */
130 struct sg_device; /* forward declarations */
133 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
134 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
135 struct sg_request *nextrp; /* NULL -> tail request (slist) */
136 struct sg_fd *parentfp; /* NULL -> not in use */
137 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
138 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
139 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
140 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
141 char orphan; /* 1 -> drop on sight, 0 -> normal */
142 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
143 volatile char done; /* 0->before bh, 1->before read, 2->read */
146 typedef struct sg_fd { /* holds the state of a file descriptor */
147 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
148 struct sg_device *parentdp; /* owning device */
149 wait_queue_head_t read_wait; /* queue read until command done */
150 rwlock_t rq_list_lock; /* protect access to list in req_arr */
151 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
152 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
153 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
154 unsigned save_scat_len; /* original length of trunc. scat. element */
155 Sg_request *headrp; /* head of request slist, NULL->empty */
156 struct fasync_struct *async_qp; /* used by asynchronous notification */
157 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
158 char low_dma; /* as in parent but possibly overridden to 1 */
159 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
160 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
161 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
162 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
163 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
164 char mmap_called; /* 0 -> mmap() never called on this fd */
167 typedef struct sg_device { /* holds the state of each scsi generic device */
168 struct scsi_device *device;
169 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
170 int sg_tablesize; /* adapter's max scatter-gather table size */
171 Sg_fd *headfp; /* first open fd belonging to this device */
172 volatile char detached; /* 0->attached, 1->detached pending removal */
173 volatile char exclude; /* opened for exclusive access */
174 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
175 struct gendisk *disk;
176 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
179 static int sg_fasync(int fd, struct file *filp, int mode);
180 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
181 static int sg_start_req(Sg_request * srp);
182 static void sg_finish_rem_req(Sg_request * srp);
183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
184 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
186 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
188 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
189 int blocking, int read_only, Sg_request ** o_srp);
190 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
191 unsigned char *cmnd, int timeout, int blocking);
192 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
193 int wr_xf, int *countp, unsigned char __user **up);
194 static int sg_write_xfer(Sg_request * srp);
195 static int sg_read_xfer(Sg_request * srp);
196 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
197 static void sg_remove_scat(Sg_scatter_hold * schp);
198 static void sg_build_reserve(Sg_fd * sfp, int req_size);
199 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
200 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
201 static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
202 static void sg_page_free(char *buff, int size);
203 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
204 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
205 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
206 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
207 static Sg_request *sg_add_request(Sg_fd * sfp);
208 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
209 static int sg_res_in_use(Sg_fd * sfp);
210 static int sg_allow_access(unsigned char opcode, char dev_type);
211 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
212 static Sg_device *sg_get_dev(int dev);
213 static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
214 #ifdef CONFIG_SCSI_PROC_FS
215 static int sg_last_dev(void);
218 static Sg_device **sg_dev_arr = NULL;
219 static int sg_dev_max;
220 static int sg_nr_dev;
222 #define SZ_SG_HEADER sizeof(struct sg_header)
223 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
224 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
225 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
228 sg_open(struct inode *inode, struct file *filp)
230 int dev = iminor(inode);
231 int flags = filp->f_flags;
237 nonseekable_open(inode, filp);
238 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
239 sdp = sg_get_dev(dev);
240 if ((!sdp) || (!sdp->device))
245 /* This driver's module count bumped by fops_get in <linux/fs.h> */
246 /* Prevent the device driver from vanishing while we sleep */
247 retval = scsi_device_get(sdp->device);
251 if (!((flags & O_NONBLOCK) ||
252 scsi_block_when_processing_errors(sdp->device))) {
254 /* we are in error recovery for this device */
258 if (flags & O_EXCL) {
259 if (O_RDONLY == (flags & O_ACCMODE)) {
260 retval = -EPERM; /* Can't lock it with read only access */
263 if (sdp->headfp && (flags & O_NONBLOCK)) {
268 __wait_event_interruptible(sdp->o_excl_wait,
269 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
271 retval = res; /* -ERESTARTSYS because signal hit process */
274 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
275 if (flags & O_NONBLOCK) {
280 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
283 retval = res; /* -ERESTARTSYS because signal hit process */
291 if (!sdp->headfp) { /* no existing opens on this device */
293 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
295 if ((sfp = sg_add_sfp(sdp, dev)))
296 filp->private_data = sfp;
299 sdp->exclude = 0; /* undo if error */
306 scsi_device_put(sdp->device);
310 /* Following function was formerly called 'sg_close' */
312 sg_release(struct inode *inode, struct file *filp)
317 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
319 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
320 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
321 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
322 if (!sdp->detached) {
323 scsi_device_put(sdp->device);
326 wake_up_interruptible(&sdp->o_excl_wait);
332 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
338 int req_pack_id = -1;
339 struct sg_header old_hdr;
343 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
345 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
346 sdp->disk->disk_name, (int) count));
347 if (!access_ok(VERIFY_WRITE, buf, count))
349 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
350 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
352 if (old_hdr.reply_len < 0) {
353 if (count >= SZ_SG_IO_HDR) {
355 (&new_hdr, buf, SZ_SG_IO_HDR))
357 req_pack_id = new_hdr.pack_id;
360 req_pack_id = old_hdr.pack_id;
362 srp = sg_get_rq_mark(sfp, req_pack_id);
363 if (!srp) { /* now wait on packet to arrive */
366 if (filp->f_flags & O_NONBLOCK)
369 res = 0; /* following is a macro that beats race condition */
370 __wait_event_interruptible(sfp->read_wait,
371 (sdp->detached || (srp = sg_get_rq_mark(sfp, req_pack_id))),
377 return res; /* -ERESTARTSYS because signal hit process */
380 if (srp->header.interface_id != '\0')
381 return sg_new_read(sfp, buf, count, srp);
384 memset(&old_hdr, 0, SZ_SG_HEADER);
385 old_hdr.reply_len = (int) hp->timeout;
386 old_hdr.pack_len = old_hdr.reply_len; /* very old, strange behaviour */
387 old_hdr.pack_id = hp->pack_id;
388 old_hdr.twelve_byte =
389 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
390 old_hdr.target_status = hp->masked_status;
391 old_hdr.host_status = hp->host_status;
392 old_hdr.driver_status = hp->driver_status;
393 if ((CHECK_CONDITION & hp->masked_status) ||
394 (DRIVER_SENSE & hp->driver_status))
395 memcpy(old_hdr.sense_buffer, srp->sense_b,
396 sizeof (old_hdr.sense_buffer));
397 switch (hp->host_status) {
398 /* This setup of 'result' is for backward compatibility and is best
399 ignored by the user who should use target, host + driver status */
401 case DID_PASSTHROUGH:
408 old_hdr.result = EBUSY;
415 old_hdr.result = EIO;
418 old_hdr.result = (srp->sense_b[0] == 0 &&
419 hp->masked_status == GOOD) ? 0 : EIO;
422 old_hdr.result = EIO;
426 /* Now copy the result back to the user buffer. */
427 if (count >= SZ_SG_HEADER) {
428 if (__copy_to_user(buf, &old_hdr, SZ_SG_HEADER))
431 if (count > old_hdr.reply_len)
432 count = old_hdr.reply_len;
433 if (count > SZ_SG_HEADER) {
435 sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)))
439 count = (old_hdr.result == 0) ? 0 : -EIO;
440 sg_finish_rem_req(srp);
445 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
447 sg_io_hdr_t *hp = &srp->header;
451 if (count < SZ_SG_IO_HDR) {
456 if ((hp->mx_sb_len > 0) && hp->sbp) {
457 if ((CHECK_CONDITION & hp->masked_status) ||
458 (DRIVER_SENSE & hp->driver_status)) {
459 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
460 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
461 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
462 len = (len > sb_len) ? sb_len : len;
463 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
470 if (hp->masked_status || hp->host_status || hp->driver_status)
471 hp->info |= SG_INFO_CHECK;
472 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
476 err = sg_read_xfer(srp);
478 sg_finish_rem_req(srp);
479 return (0 == err) ? count : err;
483 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
485 int mxsize, cmd_size, k;
486 int input_size, blocking;
487 unsigned char opcode;
491 struct sg_header old_hdr;
493 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
495 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
497 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
498 sdp->disk->disk_name, (int) count));
501 if (!((filp->f_flags & O_NONBLOCK) ||
502 scsi_block_when_processing_errors(sdp->device)))
505 if (!access_ok(VERIFY_READ, buf, count))
506 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
507 if (count < SZ_SG_HEADER)
509 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
511 blocking = !(filp->f_flags & O_NONBLOCK);
512 if (old_hdr.reply_len < 0)
513 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
514 if (count < (SZ_SG_HEADER + 6))
515 return -EIO; /* The minimum scsi command length is 6 bytes. */
517 if (!(srp = sg_add_request(sfp))) {
518 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
522 __get_user(opcode, buf);
523 if (sfp->next_cmd_len > 0) {
524 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
525 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
526 sfp->next_cmd_len = 0;
527 sg_remove_request(sfp, srp);
530 cmd_size = sfp->next_cmd_len;
531 sfp->next_cmd_len = 0; /* reset so only this write() effected */
533 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
534 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
537 SCSI_LOG_TIMEOUT(4, printk(
538 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
539 /* Determine buffer size. */
540 input_size = count - cmd_size;
541 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
542 mxsize -= SZ_SG_HEADER;
543 input_size -= SZ_SG_HEADER;
544 if (input_size < 0) {
545 sg_remove_request(sfp, srp);
546 return -EIO; /* User did not pass enough bytes for this command. */
549 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
550 hp->cmd_len = (unsigned char) cmd_size;
554 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
555 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
557 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
558 hp->dxfer_len = mxsize;
559 hp->dxferp = (char __user *)buf + cmd_size;
561 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
562 hp->flags = input_size; /* structure abuse ... */
563 hp->pack_id = old_hdr.pack_id;
565 if (__copy_from_user(cmnd, buf, cmd_size))
568 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
569 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
570 * is a non-zero input_size, so emit a warning.
572 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
573 if (printk_ratelimit())
575 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
576 "guessing data in;\n" KERN_WARNING " "
577 "program %s not setting count and/or reply_len properly\n",
578 old_hdr.reply_len - (int)SZ_SG_HEADER,
579 input_size, (unsigned int) cmnd[0],
581 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
582 return (k < 0) ? k : count;
586 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
587 int blocking, int read_only, Sg_request ** o_srp)
592 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
594 unsigned long ul_timeout;
596 if (count < SZ_SG_IO_HDR)
598 if (!access_ok(VERIFY_READ, buf, count))
599 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
601 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
602 if (!(srp = sg_add_request(sfp))) {
603 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
607 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
608 sg_remove_request(sfp, srp);
611 if (hp->interface_id != 'S') {
612 sg_remove_request(sfp, srp);
615 if (hp->flags & SG_FLAG_MMAP_IO) {
616 if (hp->dxfer_len > sfp->reserve.bufflen) {
617 sg_remove_request(sfp, srp);
618 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
620 if (hp->flags & SG_FLAG_DIRECT_IO) {
621 sg_remove_request(sfp, srp);
622 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
624 if (sg_res_in_use(sfp)) {
625 sg_remove_request(sfp, srp);
626 return -EBUSY; /* reserve buffer already being used */
629 ul_timeout = msecs_to_jiffies(srp->header.timeout);
630 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
631 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
632 sg_remove_request(sfp, srp);
635 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
636 sg_remove_request(sfp, srp);
637 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
639 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
640 sg_remove_request(sfp, srp);
644 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
645 sg_remove_request(sfp, srp);
648 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
657 sg_common_write(Sg_fd * sfp, Sg_request * srp,
658 unsigned char *cmnd, int timeout, int blocking)
662 Sg_device *sdp = sfp->parentdp;
663 sg_io_hdr_t *hp = &srp->header;
666 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
668 hp->masked_status = 0;
672 hp->driver_status = 0;
674 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
675 (int) cmnd[0], (int) hp->cmd_len));
677 if ((k = sg_start_req(srp))) {
678 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
679 sg_finish_rem_req(srp);
680 return k; /* probably out of space --> ENOMEM */
682 if ((k = sg_write_xfer(srp))) {
683 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
684 sg_finish_rem_req(srp);
688 sg_finish_rem_req(srp);
691 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
693 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
694 sg_finish_rem_req(srp);
698 srp->my_cmdp = SRpnt;
699 q = SRpnt->sr_device->request_queue;
700 SRpnt->sr_request->rq_disk = sdp->disk;
701 SRpnt->sr_sense_buffer[0] = 0;
702 SRpnt->sr_cmd_len = hp->cmd_len;
703 SRpnt->sr_use_sg = srp->data.k_use_sg;
704 SRpnt->sr_sglist_len = srp->data.sglist_len;
705 SRpnt->sr_bufflen = srp->data.bufflen;
706 SRpnt->sr_underflow = 0;
707 SRpnt->sr_buffer = srp->data.buffer;
708 switch (hp->dxfer_direction) {
709 case SG_DXFER_TO_FROM_DEV:
710 case SG_DXFER_FROM_DEV:
711 SRpnt->sr_data_direction = SCSI_DATA_READ;
713 case SG_DXFER_TO_DEV:
714 SRpnt->sr_data_direction = SCSI_DATA_WRITE;
716 case SG_DXFER_UNKNOWN:
717 SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN;
720 SRpnt->sr_data_direction = SCSI_DATA_NONE;
723 SRpnt->upper_private_data = srp;
724 srp->data.k_use_sg = 0;
725 srp->data.sglist_len = 0;
726 srp->data.bufflen = 0;
727 srp->data.buffer = NULL;
728 hp->duration = jiffies; /* unit jiffies now, millisecs after done */
729 /* Now send everything of to mid-level. The next time we hear about this
730 packet is when sg_cmd_done() is called (i.e. a callback). */
731 scsi_do_req(SRpnt, (void *) cmnd,
732 (void *) SRpnt->sr_buffer, hp->dxfer_len,
733 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
734 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
739 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
741 unsigned long iflags;
744 read_lock_irqsave(&sfp->rq_list_lock, iflags);
746 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
751 sg_ioctl(struct inode *inode, struct file *filp,
752 unsigned int cmd_in, unsigned long arg)
754 void __user *p = (void __user *)arg;
756 int result, val, read_only;
760 unsigned long iflags;
762 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
764 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
765 sdp->disk->disk_name, (int) cmd_in));
766 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
771 int blocking = 1; /* ignore O_NONBLOCK flag */
775 if (!scsi_block_when_processing_errors(sdp->device))
777 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
780 sg_new_write(sfp, p, SZ_SG_IO_HDR,
781 blocking, read_only, &srp);
784 srp->sg_io_owned = 1;
786 result = 0; /* following macro to beat race condition */
787 __wait_event_interruptible(sfp->read_wait,
788 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
793 return 0; /* request packet dropped already */
797 return result; /* -ERESTARTSYS because signal hit process */
799 write_lock_irqsave(&sfp->rq_list_lock, iflags);
801 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
802 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
803 return (result < 0) ? result : 0;
806 result = get_user(val, ip);
811 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
812 val = MULDIV (INT_MAX, USER_HZ, HZ);
813 sfp->timeout_user = val;
814 sfp->timeout = MULDIV (val, HZ, USER_HZ);
817 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
818 /* strange ..., for backward compatibility */
819 return sfp->timeout_user;
820 case SG_SET_FORCE_LOW_DMA:
821 result = get_user(val, ip);
826 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
827 val = (int) sfp->reserve.bufflen;
828 sg_remove_scat(&sfp->reserve);
829 sg_build_reserve(sfp, val);
834 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
838 return put_user((int) sfp->low_dma, ip);
840 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
843 sg_scsi_id_t __user *sg_idp = p;
847 __put_user((int) sdp->device->host->host_no,
849 __put_user((int) sdp->device->channel,
851 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
852 __put_user((int) sdp->device->lun, &sg_idp->lun);
853 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
854 __put_user((short) sdp->device->host->cmd_per_lun,
855 &sg_idp->h_cmd_per_lun);
856 __put_user((short) sdp->device->queue_depth,
857 &sg_idp->d_queue_depth);
858 __put_user(0, &sg_idp->unused[0]);
859 __put_user(0, &sg_idp->unused[1]);
862 case SG_SET_FORCE_PACK_ID:
863 result = get_user(val, ip);
866 sfp->force_packid = val ? 1 : 0;
869 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
871 read_lock_irqsave(&sfp->rq_list_lock, iflags);
872 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
873 if ((1 == srp->done) && (!srp->sg_io_owned)) {
874 read_unlock_irqrestore(&sfp->rq_list_lock,
876 __put_user(srp->header.pack_id, ip);
880 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
883 case SG_GET_NUM_WAITING:
884 read_lock_irqsave(&sfp->rq_list_lock, iflags);
885 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
886 if ((1 == srp->done) && (!srp->sg_io_owned))
889 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
890 return put_user(val, ip);
891 case SG_GET_SG_TABLESIZE:
892 return put_user(sdp->sg_tablesize, ip);
893 case SG_SET_RESERVED_SIZE:
894 result = get_user(val, ip);
899 if (val != sfp->reserve.bufflen) {
900 if (sg_res_in_use(sfp) || sfp->mmap_called)
902 sg_remove_scat(&sfp->reserve);
903 sg_build_reserve(sfp, val);
906 case SG_GET_RESERVED_SIZE:
907 val = (int) sfp->reserve.bufflen;
908 return put_user(val, ip);
909 case SG_SET_COMMAND_Q:
910 result = get_user(val, ip);
913 sfp->cmd_q = val ? 1 : 0;
915 case SG_GET_COMMAND_Q:
916 return put_user((int) sfp->cmd_q, ip);
917 case SG_SET_KEEP_ORPHAN:
918 result = get_user(val, ip);
921 sfp->keep_orphan = val;
923 case SG_GET_KEEP_ORPHAN:
924 return put_user((int) sfp->keep_orphan, ip);
925 case SG_NEXT_CMD_LEN:
926 result = get_user(val, ip);
929 sfp->next_cmd_len = (val > 0) ? val : 0;
931 case SG_GET_VERSION_NUM:
932 return put_user(sg_version_num, ip);
933 case SG_GET_ACCESS_COUNT:
934 /* faked - we don't have a real access count anymore */
935 val = (sdp->device ? 1 : 0);
936 return put_user(val, ip);
937 case SG_GET_REQUEST_TABLE:
938 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
941 sg_req_info_t rinfo[SG_MAX_QUEUE];
943 read_lock_irqsave(&sfp->rq_list_lock, iflags);
944 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
945 ++val, srp = srp ? srp->nextrp : srp) {
946 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
948 rinfo[val].req_state = srp->done + 1;
950 srp->header.masked_status &
951 srp->header.host_status &
952 srp->header.driver_status;
953 rinfo[val].duration =
954 srp->done ? srp->header.duration :
956 jiffies - srp->header.duration);
957 rinfo[val].orphan = srp->orphan;
958 rinfo[val].sg_io_owned = srp->sg_io_owned;
959 rinfo[val].pack_id = srp->header.pack_id;
960 rinfo[val].usr_ptr = srp->header.usr_ptr;
963 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
964 return (__copy_to_user(p, rinfo,
965 SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0);
967 case SG_EMULATED_HOST:
970 return put_user(sdp->device->host->hostt->emulated, ip);
974 if (filp->f_flags & O_NONBLOCK) {
975 if (test_bit(SHOST_RECOVERY,
976 &sdp->device->host->shost_state))
978 } else if (!scsi_block_when_processing_errors(sdp->device))
980 result = get_user(val, ip);
983 if (SG_SCSI_RESET_NOTHING == val)
986 case SG_SCSI_RESET_DEVICE:
987 val = SCSI_TRY_RESET_DEVICE;
989 case SG_SCSI_RESET_BUS:
990 val = SCSI_TRY_RESET_BUS;
992 case SG_SCSI_RESET_HOST:
993 val = SCSI_TRY_RESET_HOST;
998 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1000 return (scsi_reset_provider(sdp->device, val) ==
1001 SUCCESS) ? 0 : -EIO;
1002 case SCSI_IOCTL_SEND_COMMAND:
1006 unsigned char opcode = WRITE_6;
1007 Scsi_Ioctl_Command __user *siocp = p;
1009 if (copy_from_user(&opcode, siocp->data, 1))
1011 if (!sg_allow_access(opcode, sdp->device->type))
1014 return scsi_ioctl_send_command(sdp->device, p);
1016 result = get_user(val, ip);
1019 sdp->sgdebug = (char) val;
1021 case SCSI_IOCTL_GET_IDLUN:
1022 case SCSI_IOCTL_GET_BUS_NUMBER:
1023 case SCSI_IOCTL_PROBE_HOST:
1024 case SG_GET_TRANSFORM:
1027 return scsi_ioctl(sdp->device, cmd_in, p);
1030 return -EPERM; /* don't know so take safe approach */
1031 return scsi_ioctl(sdp->device, cmd_in, p);
1035 #ifdef CONFIG_COMPAT
1036 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1040 struct scsi_device *sdev;
1042 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1046 if (sdev->host->hostt->compat_ioctl) {
1049 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1054 return -ENOIOCTLCMD;
1059 sg_poll(struct file *filp, poll_table * wait)
1061 unsigned int res = 0;
1066 unsigned long iflags;
1068 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1071 poll_wait(filp, &sfp->read_wait, wait);
1072 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1073 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1074 /* if any read waiting, flag it */
1075 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1076 res = POLLIN | POLLRDNORM;
1079 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1083 else if (!sfp->cmd_q) {
1085 res |= POLLOUT | POLLWRNORM;
1086 } else if (count < SG_MAX_QUEUE)
1087 res |= POLLOUT | POLLWRNORM;
1088 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1089 sdp->disk->disk_name, (int) res));
1094 sg_fasync(int fd, struct file *filp, int mode)
1100 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1102 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1103 sdp->disk->disk_name, mode));
1105 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1106 return (retval < 0) ? retval : 0;
1109 static inline unsigned char *
1110 sg_scatg2virt(const struct scatterlist *sclp)
1112 return (sclp && sclp->page) ?
1113 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1116 /* When startFinish==1 increments page counts for pages other than the
1117 first of scatter gather elements obtained from __get_free_pages().
1118 When startFinish==0 decrements ... */
1120 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1126 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1127 startFinish, rsv_schp->k_use_sg));
1128 /* N.B. correction _not_ applied to base page of each allocation */
1129 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1130 struct scatterlist *sclp = rsv_schp->buffer;
1132 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1133 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1134 page_ptr = sg_scatg2virt(sclp) + m;
1135 page = virt_to_page(page_ptr);
1139 if (page_count(page) > 0)
1144 } else { /* reserve buffer is just a single allocation */
1145 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1146 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1147 page = virt_to_page(page_ptr);
1151 if (page_count(page) > 0)
1158 static struct page *
1159 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1162 struct page *page = NOPAGE_SIGBUS;
1163 void *page_ptr = NULL;
1164 unsigned long offset;
1165 Sg_scatter_hold *rsv_schp;
1167 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1169 rsv_schp = &sfp->reserve;
1170 offset = addr - vma->vm_start;
1171 if (offset >= rsv_schp->bufflen)
1173 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1174 offset, rsv_schp->k_use_sg));
1175 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1177 unsigned long sa = vma->vm_start;
1179 struct scatterlist *sclp = rsv_schp->buffer;
1181 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1183 len = vma->vm_end - sa;
1184 len = (len < sclp->length) ? len : sclp->length;
1186 page_ptr = sg_scatg2virt(sclp) + offset;
1187 page = virt_to_page(page_ptr);
1188 get_page(page); /* increment page count */
1194 } else { /* reserve buffer is just a single allocation */
1195 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1196 page = virt_to_page(page_ptr);
1197 get_page(page); /* increment page count */
1200 *type = VM_FAULT_MINOR;
1204 static struct vm_operations_struct sg_mmap_vm_ops = {
1205 .nopage = sg_vma_nopage,
1209 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1212 unsigned long req_sz = vma->vm_end - vma->vm_start;
1213 Sg_scatter_hold *rsv_schp;
1215 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1217 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1218 (void *) vma->vm_start, (int) req_sz));
1220 return -EINVAL; /* want no offset */
1221 rsv_schp = &sfp->reserve;
1222 if (req_sz > rsv_schp->bufflen)
1223 return -ENOMEM; /* cannot map more than reserved buffer */
1225 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1227 unsigned long sa = vma->vm_start;
1229 struct scatterlist *sclp = rsv_schp->buffer;
1231 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1233 if (0 != sclp->offset)
1234 return -EFAULT; /* non page aligned memory ?? */
1235 len = vma->vm_end - sa;
1236 len = (len < sclp->length) ? len : sclp->length;
1239 } else { /* reserve buffer is just a single allocation */
1240 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1241 return -EFAULT; /* non page aligned memory ?? */
1243 if (0 == sfp->mmap_called) {
1244 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1245 sfp->mmap_called = 1;
1247 vma->vm_flags |= (VM_RESERVED | VM_IO);
1248 vma->vm_private_data = sfp;
1249 vma->vm_ops = &sg_mmap_vm_ops;
1253 /* This function is a "bottom half" handler that is called by the
1254 * mid level when a command is completed (or has failed). */
1256 sg_cmd_done(Scsi_Cmnd * SCpnt)
1258 Scsi_Request *SRpnt = NULL;
1259 Sg_device *sdp = NULL;
1261 Sg_request *srp = NULL;
1262 unsigned long iflags;
1264 if (SCpnt && (SRpnt = SCpnt->sc_request))
1265 srp = (Sg_request *) SRpnt->upper_private_data;
1267 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1269 scsi_release_request(SRpnt);
1272 sfp = srp->parentfp;
1274 sdp = sfp->parentdp;
1275 if ((NULL == sdp) || sdp->detached) {
1276 printk(KERN_INFO "sg_cmd_done: device detached\n");
1277 scsi_release_request(SRpnt);
1281 /* First transfer ownership of data buffers to sg_device object. */
1282 srp->data.k_use_sg = SRpnt->sr_use_sg;
1283 srp->data.sglist_len = SRpnt->sr_sglist_len;
1284 srp->data.bufflen = SRpnt->sr_bufflen;
1285 srp->data.buffer = SRpnt->sr_buffer;
1286 /* now clear out request structure */
1287 SRpnt->sr_use_sg = 0;
1288 SRpnt->sr_sglist_len = 0;
1289 SRpnt->sr_bufflen = 0;
1290 SRpnt->sr_buffer = NULL;
1291 SRpnt->sr_underflow = 0;
1292 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1294 srp->my_cmdp = NULL;
1296 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1297 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1298 srp->header.resid = SCpnt->resid;
1299 /* N.B. unit of duration changes here from jiffies to millisecs */
1300 srp->header.duration =
1301 jiffies_to_msecs(jiffies - srp->header.duration);
1302 if (0 != SRpnt->sr_result) {
1303 struct scsi_sense_hdr sshdr;
1305 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1306 sizeof (srp->sense_b));
1307 srp->header.status = 0xff & SRpnt->sr_result;
1308 srp->header.masked_status = status_byte(SRpnt->sr_result);
1309 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1310 srp->header.host_status = host_byte(SRpnt->sr_result);
1311 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1312 if ((sdp->sgdebug > 0) &&
1313 ((CHECK_CONDITION == srp->header.masked_status) ||
1314 (COMMAND_TERMINATED == srp->header.masked_status)))
1315 scsi_print_req_sense("sg_cmd_done", SRpnt);
1317 /* Following if statement is a patch supplied by Eric Youngdale */
1318 if (driver_byte(SRpnt->sr_result) != 0
1319 && scsi_command_normalize_sense(SCpnt, &sshdr)
1320 && !scsi_sense_is_deferred(&sshdr)
1321 && sshdr.sense_key == UNIT_ATTENTION
1322 && sdp->device->removable) {
1323 /* Detected possible disc change. Set the bit - this */
1324 /* may be used if there are filesystems using this device */
1325 sdp->device->changed = 1;
1328 /* Rely on write phase to clean out srp status values, so no "else" */
1330 scsi_release_request(SRpnt);
1332 if (sfp->closed) { /* whoops this fd already released, cleanup */
1333 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1334 sg_finish_rem_req(srp);
1336 if (NULL == sfp->headrp) {
1337 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1338 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1339 scsi_device_put(sdp->device);
1343 } else if (srp && srp->orphan) {
1344 if (sfp->keep_orphan)
1345 srp->sg_io_owned = 0;
1347 sg_finish_rem_req(srp);
1352 /* Now wake up any sg_read() that is waiting for this packet. */
1353 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1354 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1356 wake_up_interruptible(&sfp->read_wait);
1357 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1361 static struct file_operations sg_fops = {
1362 .owner = THIS_MODULE,
1367 #ifdef CONFIG_COMPAT
1368 .compat_ioctl = sg_compat_ioctl,
1372 .release = sg_release,
1373 .fasync = sg_fasync,
1376 static struct class_simple * sg_sysfs_class;
1378 static int sg_sysfs_valid = 0;
1380 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1383 unsigned long iflags;
1384 void *old_sg_dev_arr = NULL;
1387 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
1389 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1393 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1394 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1396 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1397 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1399 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1400 if (unlikely(!tmp_da))
1403 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1404 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1405 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1406 old_sg_dev_arr = sg_dev_arr;
1407 sg_dev_arr = tmp_da;
1408 sg_dev_max = tmp_dev_max;
1411 for (k = 0; k < sg_dev_max; k++)
1414 if (unlikely(k >= SG_MAX_DEVS))
1417 memset(sdp, 0, sizeof(*sdp));
1418 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1419 sprintf(disk->disk_name, "sg%d", k);
1420 disk->first_minor = k;
1422 sdp->device = scsidp;
1423 init_waitqueue_head(&sdp->o_excl_wait);
1424 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1427 sg_dev_arr[k] = sdp;
1428 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1434 kfree(old_sg_dev_arr);
1438 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1443 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1445 "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
1446 "number exceeds %d\n", scsidp->host->host_no, scsidp->channel,
1447 scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
1453 sg_add(struct class_device *cl_dev)
1455 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1456 struct gendisk *disk;
1457 Sg_device *sdp = NULL;
1458 struct cdev * cdev = NULL;
1461 disk = alloc_disk(1);
1463 printk(KERN_WARNING "alloc_disk failed\n");
1466 disk->major = SCSI_GENERIC_MAJOR;
1469 cdev = cdev_alloc();
1471 printk(KERN_WARNING "cdev_alloc failed\n");
1474 cdev->owner = THIS_MODULE;
1475 cdev->ops = &sg_fops;
1477 error = sg_alloc(disk, scsidp);
1479 printk(KERN_WARNING "sg_alloc failed\n");
1483 sdp = sg_dev_arr[k];
1485 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1486 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1487 "%s/generic", scsidp->devfs_name);
1488 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1490 devfs_remove("%s/generic", scsidp->devfs_name);
1494 if (sg_sysfs_valid) {
1495 struct class_device * sg_class_member;
1497 sg_class_member = class_simple_device_add(sg_sysfs_class,
1498 MKDEV(SCSI_GENERIC_MAJOR, k),
1501 if (IS_ERR(sg_class_member))
1502 printk(KERN_WARNING "sg_add: "
1503 "class_simple_device_add failed\n");
1504 class_set_devdata(sg_class_member, sdp);
1505 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1506 &sg_class_member->kobj, "generic");
1508 printk(KERN_ERR "sg_add: unable to make symlink "
1509 "'generic' back to sg%d\n", k);
1511 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1514 "Attached scsi generic sg%d at scsi%d, channel"
1515 " %d, id %d, lun %d, type %d\n", k,
1516 scsidp->host->host_no, scsidp->channel, scsidp->id,
1517 scsidp->lun, scsidp->type);
1529 sg_remove(struct class_device *cl_dev)
1531 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1532 Sg_device *sdp = NULL;
1533 unsigned long iflags;
1540 if (NULL == sg_dev_arr)
1543 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1544 for (k = 0; k < sg_dev_max; k++) {
1545 sdp = sg_dev_arr[k];
1546 if ((NULL == sdp) || (sdp->device != scsidp))
1547 continue; /* dirty but lowers nesting */
1550 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1552 for (srp = sfp->headrp; srp; srp = tsrp) {
1554 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1555 sg_finish_rem_req(srp);
1558 scsi_device_put(sdp->device);
1559 __sg_remove_sfp(sdp, sfp);
1562 wake_up_interruptible(&sfp->read_wait);
1563 kill_fasync(&sfp->async_qp, SIGPOLL,
1567 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1568 if (NULL == sdp->headfp) {
1569 sg_dev_arr[k] = NULL;
1571 } else { /* nothing active, simple case */
1572 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1573 sg_dev_arr[k] = NULL;
1578 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1581 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1582 class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k));
1583 cdev_del(sdp->cdev);
1585 devfs_remove("%s/generic", scsidp->devfs_name);
1586 put_disk(sdp->disk);
1588 if (NULL == sdp->headfp)
1589 kfree((char *) sdp);
1593 msleep(10); /* dirty detach so delay device destruction */
1596 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1597 * of sysfs parameters (which module_param doesn't yet support).
1598 * Sysfs parameters defined explicitly below.
1600 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
1601 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1603 MODULE_AUTHOR("Douglas Gilbert");
1604 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1605 MODULE_LICENSE("GPL");
1606 MODULE_VERSION(SG_VERSION_STR);
1608 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1609 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1616 if (def_reserved_size >= 0)
1617 sg_big_buff = def_reserved_size;
1619 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1623 sg_sysfs_class = class_simple_create(THIS_MODULE, "scsi_generic");
1624 if ( IS_ERR(sg_sysfs_class) ) {
1625 rc = PTR_ERR(sg_sysfs_class);
1629 rc = scsi_register_interface(&sg_interface);
1631 #ifdef CONFIG_SCSI_PROC_FS
1633 #endif /* CONFIG_SCSI_PROC_FS */
1636 class_simple_destroy(sg_sysfs_class);
1638 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1645 #ifdef CONFIG_SCSI_PROC_FS
1647 #endif /* CONFIG_SCSI_PROC_FS */
1648 scsi_unregister_interface(&sg_interface);
1649 class_simple_destroy(sg_sysfs_class);
1651 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1653 if (sg_dev_arr != NULL) {
1654 kfree((char *) sg_dev_arr);
1661 sg_start_req(Sg_request * srp)
1664 Sg_fd *sfp = srp->parentfp;
1665 sg_io_hdr_t *hp = &srp->header;
1666 int dxfer_len = (int) hp->dxfer_len;
1667 int dxfer_dir = hp->dxfer_direction;
1668 Sg_scatter_hold *req_schp = &srp->data;
1669 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1671 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1672 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1674 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1675 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1676 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1677 res = sg_build_direct(srp, sfp, dxfer_len);
1678 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1681 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1682 sg_link_reserve(sfp, srp, dxfer_len);
1684 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1686 sg_remove_scat(req_schp);
1694 sg_finish_rem_req(Sg_request * srp)
1696 Sg_fd *sfp = srp->parentfp;
1697 Sg_scatter_hold *req_schp = &srp->data;
1699 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1701 sg_unlink_reserve(sfp, srp);
1703 sg_remove_scat(req_schp);
1704 sg_remove_request(sfp, srp);
1708 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1711 int elem_sz = sizeof (struct scatterlist);
1712 int sg_bufflen = tablesize * elem_sz;
1713 int mx_sc_elems = tablesize;
1715 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1718 else if (ret_sz != sg_bufflen) {
1719 sg_bufflen = ret_sz;
1720 mx_sc_elems = sg_bufflen / elem_sz;
1722 schp->sglist_len = sg_bufflen;
1723 memset(schp->buffer, 0, sg_bufflen);
1724 return mx_sc_elems; /* number of scat_gath elements allocated */
1727 #ifdef SG_ALLOW_DIO_CODE
1728 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1729 /* hopefully this generic code will moved to a library */
1731 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1732 - mapping of all pages not successful
1733 - any page is above max_pfn
1734 (i.e., either completely successful or fails)
1737 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1738 unsigned long uaddr, size_t count, int rw,
1739 unsigned long max_pfn)
1742 unsigned int nr_pages;
1743 struct page **pages;
1745 nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
1747 /* User attempted Overflow! */
1748 if ((uaddr + count) < uaddr)
1752 if (nr_pages > max_pages)
1759 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1762 /* Try to fault in all of the necessary pages */
1763 down_read(¤t->mm->mmap_sem);
1764 /* rw==READ means read from drive, write into memory area */
1765 res = get_user_pages(
1771 0, /* don't force */
1774 up_read(¤t->mm->mmap_sem);
1776 /* Errors and no page mapped should return here */
1780 for (i=0; i < nr_pages; i++) {
1781 /* FIXME: flush superflous for rw==READ,
1782 * probably wrong function for rw==WRITE
1784 flush_dcache_page(pages[i]);
1785 if (page_to_pfn(pages[i]) > max_pfn)
1787 /* ?? Is locking needed? I don't think so */
1788 /* if (TestSetPageLocked(pages[i]))
1792 /* Populate the scatter/gather list */
1793 sgl[0].page = pages[0];
1794 sgl[0].offset = uaddr & ~PAGE_MASK;
1796 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1797 count -= sgl[0].length;
1798 for (i=1; i < nr_pages ; i++) {
1800 sgl[i].page = pages[i];
1801 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1806 sgl[0].length = count;
1813 /* for (j=0; j < i; j++)
1814 unlock_page(pages[j]); */
1818 for (j=0; j < res; j++)
1819 page_cache_release(pages[j]);
1825 /* And unmap them... */
1827 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1832 for (i=0; i < nr_pages; i++) {
1833 if (dirtied && !PageReserved(sgl[i].page))
1834 SetPageDirty(sgl[i].page);
1835 /* unlock_page(sgl[i].page); */
1836 /* FIXME: cache flush missing for rw==READ
1837 * FIXME: call the correct reference counting function
1839 page_cache_release(sgl[i].page);
1845 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1849 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1851 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1853 #ifdef SG_ALLOW_DIO_CODE
1854 sg_io_hdr_t *hp = &srp->header;
1855 Sg_scatter_hold *schp = &srp->data;
1856 int sg_tablesize = sfp->parentdp->sg_tablesize;
1857 struct scatterlist *sgl;
1858 int mx_sc_elems, res;
1859 struct scsi_device *sdev = sfp->parentdp->device;
1861 if (((unsigned long)hp->dxferp &
1862 queue_dma_alignment(sdev->request_queue)) != 0)
1864 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1865 if (mx_sc_elems <= 0) {
1868 sgl = (struct scatterlist *)schp->buffer;
1869 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1870 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1873 schp->k_use_sg = res;
1874 schp->dio_in_use = 1;
1875 hp->info |= SG_INFO_DIRECT_IO;
1883 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1886 int blk_size = buff_size;
1887 unsigned char *p = NULL;
1889 if ((blk_size < 0) || (!sfp))
1892 ++blk_size; /* don't know why */
1893 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1894 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1895 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1896 buff_size, blk_size));
1897 if (blk_size <= SG_SCATTER_SZ) {
1898 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1901 if (blk_size == ret_sz) { /* got it on the first attempt */
1904 schp->bufflen = blk_size;
1905 schp->b_malloc_len = blk_size;
1909 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1913 /* Want some local declarations, so start new block ... */
1914 { /* lets try and build a scatter gather list */
1915 struct scatterlist *sclp;
1918 int sg_tablesize = sfp->parentdp->sg_tablesize;
1921 /* N.B. ret_sz carried into this block ... */
1922 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1923 if (mx_sc_elems < 0)
1924 return mx_sc_elems; /* most likely -ENOMEM */
1926 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1927 (rem_sz > 0) && (k < mx_sc_elems);
1928 ++k, rem_sz -= ret_sz, ++sclp) {
1934 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1935 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1939 sclp->page = virt_to_page(p);
1940 sclp->offset = offset_in_page(p);
1941 sclp->length = ret_sz;
1943 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1944 k, sg_scatg2virt(sclp), ret_sz));
1945 } /* end of for loop */
1947 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1948 schp->bufflen = blk_size;
1949 if (rem_sz > 0) /* must have failed */
1956 sg_write_xfer(Sg_request * srp)
1958 sg_io_hdr_t *hp = &srp->header;
1959 Sg_scatter_hold *schp = &srp->data;
1961 int j, k, onum, usglen, ksglen, res;
1962 int iovec_count = (int) hp->iovec_count;
1963 int dxfer_dir = hp->dxfer_direction;
1965 unsigned char __user *up;
1966 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1968 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1969 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1970 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1971 if (schp->bufflen < num_xfer)
1972 num_xfer = schp->bufflen;
1974 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1976 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1979 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1980 num_xfer, iovec_count, schp->k_use_sg));
1983 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1988 if (0 == schp->k_use_sg) { /* kernel has single buffer */
1989 for (j = 0, p = schp->buffer; j < onum; ++j) {
1990 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1993 usglen = (num_xfer > usglen) ? usglen : num_xfer;
1994 if (__copy_from_user(p, up, usglen))
2001 } else { /* kernel using scatter gather list */
2002 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2004 ksglen = (int) sclp->length;
2005 p = sg_scatg2virt(sclp);
2006 for (j = 0, k = 0; j < onum; ++j) {
2007 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2011 for (; p; ++sclp, ksglen = (int) sclp->length,
2012 p = sg_scatg2virt(sclp)) {
2015 if (ksglen > usglen) {
2016 if (usglen >= num_xfer) {
2017 if (__copy_from_user
2022 if (__copy_from_user(p, up, usglen))
2028 if (ksglen >= num_xfer) {
2029 if (__copy_from_user
2034 if (__copy_from_user(p, up, ksglen))
2040 if (k >= schp->k_use_sg)
2049 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
2050 int wr_xf, int *countp, unsigned char __user **up)
2052 int num_xfer = (int) hp->dxfer_len;
2053 unsigned char __user *p = hp->dxferp;
2057 if (wr_xf && ('\0' == hp->interface_id))
2058 count = (int) hp->flags; /* holds "old" input_size */
2063 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2066 count = (int) iovec.iov_len;
2068 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
2078 sg_remove_scat(Sg_scatter_hold * schp)
2080 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2081 if (schp->buffer && (schp->sglist_len > 0)) {
2082 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2084 if (schp->dio_in_use) {
2085 #ifdef SG_ALLOW_DIO_CODE
2086 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2091 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2093 SCSI_LOG_TIMEOUT(5, printk(
2094 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2095 k, sg_scatg2virt(sclp), sclp->length));
2096 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2102 sg_page_free(schp->buffer, schp->sglist_len);
2103 } else if (schp->buffer)
2104 sg_page_free(schp->buffer, schp->b_malloc_len);
2105 memset(schp, 0, sizeof (*schp));
2109 sg_read_xfer(Sg_request * srp)
2111 sg_io_hdr_t *hp = &srp->header;
2112 Sg_scatter_hold *schp = &srp->data;
2114 int j, k, onum, usglen, ksglen, res;
2115 int iovec_count = (int) hp->iovec_count;
2116 int dxfer_dir = hp->dxfer_direction;
2118 unsigned char __user *up;
2119 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2121 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2122 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2123 num_xfer = hp->dxfer_len;
2124 if (schp->bufflen < num_xfer)
2125 num_xfer = schp->bufflen;
2127 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2129 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2132 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2133 num_xfer, iovec_count, schp->k_use_sg));
2136 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2141 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2142 for (j = 0, p = schp->buffer; j < onum; ++j) {
2143 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2146 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2147 if (__copy_to_user(up, p, usglen))
2154 } else { /* kernel using scatter gather list */
2155 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2157 ksglen = (int) sclp->length;
2158 p = sg_scatg2virt(sclp);
2159 for (j = 0, k = 0; j < onum; ++j) {
2160 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2164 for (; p; ++sclp, ksglen = (int) sclp->length,
2165 p = sg_scatg2virt(sclp)) {
2168 if (ksglen > usglen) {
2169 if (usglen >= num_xfer) {
2175 if (__copy_to_user(up, p, usglen))
2181 if (ksglen >= num_xfer) {
2187 if (__copy_to_user(up, p, ksglen))
2193 if (k >= schp->k_use_sg)
2202 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2204 Sg_scatter_hold *schp = &srp->data;
2206 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2208 if ((!outp) || (num_read_xfer <= 0))
2210 if (schp->k_use_sg > 0) {
2212 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2214 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2216 num = (int) sclp->length;
2217 if (num > num_read_xfer) {
2219 (outp, sg_scatg2virt(sclp), num_read_xfer))
2224 (outp, sg_scatg2virt(sclp), num))
2226 num_read_xfer -= num;
2227 if (num_read_xfer <= 0)
2233 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2240 sg_build_reserve(Sg_fd * sfp, int req_size)
2242 Sg_scatter_hold *schp = &sfp->reserve;
2244 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2246 if (req_size < PAGE_SIZE)
2247 req_size = PAGE_SIZE;
2248 if (0 == sg_build_indirect(schp, sfp, req_size))
2251 sg_remove_scat(schp);
2252 req_size >>= 1; /* divide by 2 */
2253 } while (req_size > (PAGE_SIZE / 2));
2257 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2259 Sg_scatter_hold *req_schp = &srp->data;
2260 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2263 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2264 size = (size + 1) & (~1); /* round to even for aha1542 */
2265 if (rsv_schp->k_use_sg > 0) {
2268 struct scatterlist *sclp =
2269 (struct scatterlist *) rsv_schp->buffer;
2271 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2272 num = (int) sclp->length;
2275 req_schp->k_use_sg = 0;
2276 req_schp->buffer = sg_scatg2virt(sclp);
2278 sfp->save_scat_len = num;
2279 sclp->length = (unsigned) rem;
2280 req_schp->k_use_sg = k + 1;
2281 req_schp->sglist_len =
2282 rsv_schp->sglist_len;
2283 req_schp->buffer = rsv_schp->buffer;
2285 req_schp->bufflen = size;
2286 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2291 if (k >= rsv_schp->k_use_sg)
2292 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2294 req_schp->k_use_sg = 0;
2295 req_schp->bufflen = size;
2296 req_schp->buffer = rsv_schp->buffer;
2297 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2302 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2304 Sg_scatter_hold *req_schp = &srp->data;
2305 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2307 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2308 (int) req_schp->k_use_sg));
2309 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2310 struct scatterlist *sclp =
2311 (struct scatterlist *) rsv_schp->buffer;
2313 if (sfp->save_scat_len > 0)
2314 (sclp + (req_schp->k_use_sg - 1))->length =
2315 (unsigned) sfp->save_scat_len;
2317 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2319 req_schp->k_use_sg = 0;
2320 req_schp->bufflen = 0;
2321 req_schp->buffer = NULL;
2322 req_schp->sglist_len = 0;
2323 sfp->save_scat_len = 0;
2328 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2331 unsigned long iflags;
2333 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2334 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2335 /* look for requests that are ready + not SG_IO owned */
2336 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2337 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2338 resp->done = 2; /* guard against other readers */
2342 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2346 #ifdef CONFIG_SCSI_PROC_FS
2348 sg_get_nth_request(Sg_fd * sfp, int nth)
2351 unsigned long iflags;
2354 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2355 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2356 ++k, resp = resp->nextrp) ;
2357 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2362 /* always adds to end of list */
2364 sg_add_request(Sg_fd * sfp)
2367 unsigned long iflags;
2369 Sg_request *rp = sfp->req_arr;
2371 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2374 memset(rp, 0, sizeof (Sg_request));
2379 if (0 == sfp->cmd_q)
2380 resp = NULL; /* command queuing disallowed */
2382 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2386 if (k < SG_MAX_QUEUE) {
2387 memset(rp, 0, sizeof (Sg_request));
2389 while (resp->nextrp)
2390 resp = resp->nextrp;
2398 resp->nextrp = NULL;
2399 resp->header.duration = jiffies;
2400 resp->my_cmdp = NULL;
2402 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2406 /* Return of 1 for found; 0 for not found */
2408 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2410 Sg_request *prev_rp;
2412 unsigned long iflags;
2415 if ((!sfp) || (!srp) || (!sfp->headrp))
2417 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2418 prev_rp = sfp->headrp;
2419 if (srp == prev_rp) {
2420 sfp->headrp = prev_rp->nextrp;
2421 prev_rp->parentfp = NULL;
2424 while ((rp = prev_rp->nextrp)) {
2426 prev_rp->nextrp = rp->nextrp;
2427 rp->parentfp = NULL;
2434 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2438 #ifdef CONFIG_SCSI_PROC_FS
2440 sg_get_nth_sfp(Sg_device * sdp, int nth)
2443 unsigned long iflags;
2446 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2447 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2448 ++k, resp = resp->nextfp) ;
2449 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2455 sg_add_sfp(Sg_device * sdp, int dev)
2458 unsigned long iflags;
2460 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL);
2463 memset(sfp, 0, sizeof (Sg_fd));
2464 init_waitqueue_head(&sfp->read_wait);
2465 rwlock_init(&sfp->rq_list_lock);
2467 sfp->timeout = SG_DEFAULT_TIMEOUT;
2468 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2469 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2470 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2471 sdp->device->host->unchecked_isa_dma : 1;
2472 sfp->cmd_q = SG_DEF_COMMAND_Q;
2473 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2474 sfp->parentdp = sdp;
2475 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2478 else { /* add to tail of existing list */
2479 Sg_fd *pfp = sdp->headfp;
2484 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2485 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2486 sg_build_reserve(sfp, sg_big_buff);
2487 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2488 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2493 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2498 prev_fp = sdp->headfp;
2500 sdp->headfp = prev_fp->nextfp;
2502 while ((fp = prev_fp->nextfp)) {
2504 prev_fp->nextfp = fp->nextfp;
2510 if (sfp->reserve.bufflen > 0) {
2512 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2513 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2514 if (sfp->mmap_called)
2515 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2516 sg_remove_scat(&sfp->reserve);
2518 sfp->parentdp = NULL;
2519 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2520 sg_page_free((char *) sfp, sizeof (Sg_fd));
2523 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2525 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2532 for (srp = sfp->headrp; srp; srp = tsrp) {
2534 if (sg_srp_done(srp, sfp))
2535 sg_finish_rem_req(srp);
2540 unsigned long iflags;
2542 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2543 __sg_remove_sfp(sdp, sfp);
2544 if (sdp->detached && (NULL == sdp->headfp)) {
2548 for (k = 0; k < maxd; ++k) {
2549 if (sdp == sg_dev_arr[k])
2553 sg_dev_arr[k] = NULL;
2554 kfree((char *) sdp);
2557 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2559 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2560 /* only bump the access_count if we actually succeeded in
2561 * throwing another counter on the host module */
2562 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2563 sfp->closed = 1; /* flag dirty state on this fd */
2564 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2571 sg_res_in_use(Sg_fd * sfp)
2573 const Sg_request *srp;
2574 unsigned long iflags;
2576 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2577 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2580 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2584 /* If retSzp==NULL want exact size or fail */
2586 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2597 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2599 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2601 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2602 order++, a_size <<= 1) ;
2603 resp = (char *) __get_free_pages(page_mask, order);
2604 while ((!resp) && order && retSzp) {
2606 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2607 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2611 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2612 memset(resp, 0, resSz);
2620 sg_page_free(char *buff, int size)
2626 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2627 order++, a_size <<= 1) ;
2628 free_pages((unsigned long) buff, order);
2631 #ifndef MAINTENANCE_IN_CMD
2632 #define MAINTENANCE_IN_CMD 0xa3
2635 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2636 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2637 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2638 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2642 sg_allow_access(unsigned char opcode, char dev_type)
2646 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2648 for (k = 0; k < sizeof (allow_ops); ++k) {
2649 if (opcode == allow_ops[k])
2655 #ifdef CONFIG_SCSI_PROC_FS
2660 unsigned long iflags;
2662 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2663 for (k = sg_dev_max - 1; k >= 0; --k)
2664 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2666 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2667 return k + 1; /* origin 1 */
2674 Sg_device *sdp = NULL;
2675 unsigned long iflags;
2677 if (sg_dev_arr && (dev >= 0)) {
2678 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2679 if (dev < sg_dev_max)
2680 sdp = sg_dev_arr[dev];
2681 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2686 #ifdef CONFIG_SCSI_PROC_FS
2688 static struct proc_dir_entry *sg_proc_sgp = NULL;
2690 static char sg_proc_sg_dirname[] = "scsi/sg";
2692 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2694 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2695 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2696 size_t count, loff_t *off);
2697 static struct file_operations adio_fops = {
2698 /* .owner, .read and .llseek added in sg_proc_init() */
2699 .open = sg_proc_single_open_adio,
2700 .write = sg_proc_write_adio,
2701 .release = single_release,
2704 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2705 static ssize_t sg_proc_write_dressz(struct file *filp,
2706 const char __user *buffer, size_t count, loff_t *off);
2707 static struct file_operations dressz_fops = {
2708 .open = sg_proc_single_open_dressz,
2709 .write = sg_proc_write_dressz,
2710 .release = single_release,
2713 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2714 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2715 static struct file_operations version_fops = {
2716 .open = sg_proc_single_open_version,
2717 .release = single_release,
2720 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2721 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2722 static struct file_operations devhdr_fops = {
2723 .open = sg_proc_single_open_devhdr,
2724 .release = single_release,
2727 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2728 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2729 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2730 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2731 static void dev_seq_stop(struct seq_file *s, void *v);
2732 static struct file_operations dev_fops = {
2733 .open = sg_proc_open_dev,
2734 .release = seq_release,
2736 static struct seq_operations dev_seq_ops = {
2737 .start = dev_seq_start,
2738 .next = dev_seq_next,
2739 .stop = dev_seq_stop,
2740 .show = sg_proc_seq_show_dev,
2743 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2744 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2745 static struct file_operations devstrs_fops = {
2746 .open = sg_proc_open_devstrs,
2747 .release = seq_release,
2749 static struct seq_operations devstrs_seq_ops = {
2750 .start = dev_seq_start,
2751 .next = dev_seq_next,
2752 .stop = dev_seq_stop,
2753 .show = sg_proc_seq_show_devstrs,
2756 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2757 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2758 static struct file_operations debug_fops = {
2759 .open = sg_proc_open_debug,
2760 .release = seq_release,
2762 static struct seq_operations debug_seq_ops = {
2763 .start = dev_seq_start,
2764 .next = dev_seq_next,
2765 .stop = dev_seq_stop,
2766 .show = sg_proc_seq_show_debug,
2770 struct sg_proc_leaf {
2772 struct file_operations * fops;
2775 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2776 {"allow_dio", &adio_fops},
2777 {"debug", &debug_fops},
2778 {"def_reserved_size", &dressz_fops},
2779 {"device_hdr", &devhdr_fops},
2780 {"devices", &dev_fops},
2781 {"device_strs", &devstrs_fops},
2782 {"version", &version_fops}
2790 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2791 struct proc_dir_entry *pdep;
2792 struct sg_proc_leaf * leaf;
2794 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
2795 S_IFDIR | S_IRUGO | S_IXUGO, NULL);
2798 for (k = 0; k < num_leaves; ++k) {
2799 leaf = &sg_proc_leaf_arr[k];
2800 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2801 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2803 leaf->fops->owner = THIS_MODULE,
2804 leaf->fops->read = seq_read,
2805 leaf->fops->llseek = seq_lseek,
2806 pdep->proc_fops = leaf->fops;
2813 sg_proc_cleanup(void)
2817 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2821 for (k = 0; k < num_leaves; ++k)
2822 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2823 remove_proc_entry(sg_proc_sg_dirname, NULL);
2827 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2829 seq_printf(s, "%d\n", *((int *)s->private));
2833 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2835 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2839 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2840 size_t count, loff_t *off)
2845 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2847 num = (count < 10) ? count : 10;
2848 if (copy_from_user(buff, buffer, num))
2851 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2855 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2857 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2861 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2862 size_t count, loff_t *off)
2865 unsigned long k = ULONG_MAX;
2868 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2870 num = (count < 10) ? count : 10;
2871 if (copy_from_user(buff, buffer, num))
2874 k = simple_strtoul(buff, NULL, 10);
2875 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2882 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2884 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2889 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2891 return single_open(file, sg_proc_seq_show_version, NULL);
2894 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2896 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2901 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2903 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2906 struct sg_proc_deviter {
2911 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2913 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2917 if (NULL == sg_dev_arr)
2920 it->max = sg_last_dev();
2921 if (it->index >= it->max)
2929 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2931 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2934 return (it->index < it->max) ? it : NULL;
2937 static void dev_seq_stop(struct seq_file *s, void *v)
2942 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2944 return seq_open(file, &dev_seq_ops);
2947 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2949 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2951 struct scsi_device *scsidp;
2953 sdp = it ? sg_get_dev(it->index) : NULL;
2954 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2955 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2956 scsidp->host->host_no, scsidp->channel,
2957 scsidp->id, scsidp->lun, (int) scsidp->type,
2959 (int) scsidp->queue_depth,
2960 (int) scsidp->device_busy,
2961 (int) scsi_device_online(scsidp));
2963 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2967 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2969 return seq_open(file, &devstrs_seq_ops);
2972 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2974 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2976 struct scsi_device *scsidp;
2978 sdp = it ? sg_get_dev(it->index) : NULL;
2979 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2980 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2981 scsidp->vendor, scsidp->model, scsidp->rev);
2983 seq_printf(s, "<no active device>\n");
2987 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2989 int k, m, new_interface, blen, usg;
2992 const sg_io_hdr_t *hp;
2995 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2996 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2997 "(res)sgat=%d low_dma=%d\n", k + 1,
2998 jiffies_to_msecs(fp->timeout),
2999 fp->reserve.bufflen,
3000 (int) fp->reserve.k_use_sg,
3002 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
3003 (int) fp->cmd_q, (int) fp->force_packid,
3004 (int) fp->keep_orphan, (int) fp->closed);
3005 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
3007 new_interface = (hp->interface_id == '\0') ? 0 : 1;
3008 if (srp->res_used) {
3009 if (new_interface &&
3010 (SG_FLAG_MMAP_IO & hp->flags))
3015 if (SG_INFO_DIRECT_IO_MASK & hp->info)
3021 blen = srp->my_cmdp ?
3022 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
3023 usg = srp->my_cmdp ?
3024 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
3025 seq_printf(s, srp->done ?
3026 ((1 == srp->done) ? "rcv:" : "fin:")
3027 : (srp->my_cmdp ? "act:" : "prior:"));
3028 seq_printf(s, " id=%d blen=%d",
3029 srp->header.pack_id, blen);
3031 seq_printf(s, " dur=%d", hp->duration);
3033 seq_printf(s, " t_o/elap=%d/%d",
3034 new_interface ? hp->timeout : jiffies_to_msecs(fp->timeout),
3035 jiffies_to_msecs(hp->duration ? (jiffies - hp->duration) : 0));
3036 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
3037 (int) srp->data.cmd_opcode);
3040 seq_printf(s, " No requests active\n");
3044 static int sg_proc_open_debug(struct inode *inode, struct file *file)
3046 return seq_open(file, &debug_seq_ops);
3049 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3051 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3054 if (it && (0 == it->index)) {
3055 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3056 "(origin 1)\n", sg_dev_max, (int)it->max);
3057 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3059 sdp = it ? sg_get_dev(it->index) : NULL;
3061 struct scsi_device *scsidp = sdp->device;
3063 if (NULL == scsidp) {
3064 seq_printf(s, "device %d detached ??\n",
3069 if (sg_get_nth_sfp(sdp, 0)) {
3070 seq_printf(s, " >>> device=%s ",
3071 sdp->disk->disk_name);
3073 seq_printf(s, "detached pending close ");
3076 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3077 scsidp->host->host_no,
3078 scsidp->channel, scsidp->id,
3080 scsidp->host->hostt->emulated);
3081 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3082 sdp->sg_tablesize, sdp->exclude);
3084 sg_proc_debug_helper(s, sdp);
3089 #endif /* CONFIG_SCSI_PROC_FS */
3091 module_init(init_sg);
3092 module_exit(exit_sg);
3093 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);