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 - 2004 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 = 30531; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.31"
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>
51 #include <linux/blkdev.h>
53 #include <scsi/scsi_host.h>
54 #include <scsi/scsi_driver.h>
55 #include <scsi/scsi_ioctl.h>
58 #include "scsi_logging.h"
60 #ifdef CONFIG_SCSI_PROC_FS
61 #include <linux/proc_fs.h>
62 static char *sg_version_date = "20040516";
64 static int sg_proc_init(void);
65 static void sg_proc_cleanup(void);
68 #ifndef LINUX_VERSION_CODE
69 #include <linux/version.h>
70 #endif /* LINUX_VERSION_CODE */
72 #define SG_ALLOW_DIO_DEF 0
73 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
75 #define SG_MAX_DEVS 32768
78 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
79 * Then when using 32 bit integers x * m may overflow during the calculation.
80 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
81 * calculates the same, but prevents the overflow when both m and d
82 * are "small" numbers (like HZ and USER_HZ).
83 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
86 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
88 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
90 int sg_big_buff = SG_DEF_RESERVED_SIZE;
91 /* N.B. This variable is readable and writeable via
92 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
93 of this size (or less if there is not enough memory) will be reserved
94 for use by this file descriptor. [Deprecated usage: this variable is also
95 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
96 the kernel (i.e. it is not a module).] */
97 static int def_reserved_size = -1; /* picks up init parameter */
98 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
100 #define SG_SECTOR_SZ 512
101 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
103 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
105 static int sg_add(struct class_device *);
106 static void sg_remove(struct class_device *);
108 static Scsi_Request *dummy_cmdp; /* only used for sizeof */
110 static rwlock_t sg_dev_arr_lock = RW_LOCK_UNLOCKED; /* Also used to lock
111 file descriptor list for device */
113 static struct class_interface sg_interface = {
118 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
119 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
120 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
121 unsigned bufflen; /* Size of (aggregate) data buffer */
122 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
123 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
124 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
125 unsigned char cmd_opcode; /* first byte of command */
128 struct sg_device; /* forward declarations */
131 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
132 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
133 struct sg_request *nextrp; /* NULL -> tail request (slist) */
134 struct sg_fd *parentfp; /* NULL -> not in use */
135 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
136 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
137 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
138 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
139 char orphan; /* 1 -> drop on sight, 0 -> normal */
140 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
141 volatile char done; /* 0->before bh, 1->before read, 2->read */
144 typedef struct sg_fd { /* holds the state of a file descriptor */
145 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
146 struct sg_device *parentdp; /* owning device */
147 wait_queue_head_t read_wait; /* queue read until command done */
148 rwlock_t rq_list_lock; /* protect access to list in req_arr */
149 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
150 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
151 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
152 unsigned save_scat_len; /* original length of trunc. scat. element */
153 Sg_request *headrp; /* head of request slist, NULL->empty */
154 struct fasync_struct *async_qp; /* used by asynchronous notification */
155 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
156 char low_dma; /* as in parent but possibly overridden to 1 */
157 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
158 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
159 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
160 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
161 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
162 char mmap_called; /* 0 -> mmap() never called on this fd */
165 typedef struct sg_device { /* holds the state of each scsi generic device */
166 struct scsi_device *device;
167 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
168 int sg_tablesize; /* adapter's max scatter-gather table size */
169 Sg_fd *headfp; /* first open fd belonging to this device */
170 volatile char detached; /* 0->attached, 1->detached pending removal */
171 volatile char exclude; /* opened for exclusive access */
172 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
173 struct gendisk *disk;
174 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
177 static int sg_fasync(int fd, struct file *filp, int mode);
178 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
179 static int sg_start_req(Sg_request * srp);
180 static void sg_finish_rem_req(Sg_request * srp);
181 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
182 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
186 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
187 int blocking, int read_only, Sg_request ** o_srp);
188 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
189 unsigned char *cmnd, int timeout, int blocking);
190 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
191 int wr_xf, int *countp, unsigned char __user **up);
192 static int sg_write_xfer(Sg_request * srp);
193 static int sg_read_xfer(Sg_request * srp);
194 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
195 static void sg_remove_scat(Sg_scatter_hold * schp);
196 static void sg_build_reserve(Sg_fd * sfp, int req_size);
197 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
198 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
199 static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
200 static void sg_page_free(char *buff, int size);
201 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
202 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
203 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
204 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
205 static Sg_request *sg_add_request(Sg_fd * sfp);
206 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
207 static int sg_res_in_use(Sg_fd * sfp);
208 static int sg_ms_to_jif(unsigned int msecs);
209 static inline unsigned sg_jif_to_ms(int jifs);
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 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
238 sdp = sg_get_dev(dev);
239 if ((!sdp) || (!sdp->device))
244 /* scsi generic is only for non-disk, non-cd, non-tape devices */
245 if ( (sdp->device->type == TYPE_DISK) || (sdp->device->type == TYPE_MOD) || (sdp->device->type == TYPE_ROM)
246 || (sdp->device->type == TYPE_WORM) || ( sdp->device->type == TYPE_TAPE))
247 printk(KERN_WARNING "%s: Using deprecated /dev/sg mechanism instead of SG_IO on the actual device\n",current->comm);
250 /* This driver's module count bumped by fops_get in <linux/fs.h> */
251 /* Prevent the device driver from vanishing while we sleep */
252 retval = scsi_device_get(sdp->device);
256 if (!((flags & O_NONBLOCK) ||
257 scsi_block_when_processing_errors(sdp->device))) {
259 /* we are in error recovery for this device */
263 if (flags & O_EXCL) {
264 if (O_RDONLY == (flags & O_ACCMODE)) {
265 retval = -EPERM; /* Can't lock it with read only access */
268 if (sdp->headfp && (flags & O_NONBLOCK)) {
273 __wait_event_interruptible(sdp->o_excl_wait,
274 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
276 retval = res; /* -ERESTARTSYS because signal hit process */
279 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
280 if (flags & O_NONBLOCK) {
285 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
288 retval = res; /* -ERESTARTSYS because signal hit process */
296 if (!sdp->headfp) { /* no existing opens on this device */
298 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
300 if ((sfp = sg_add_sfp(sdp, dev)))
301 filp->private_data = sfp;
304 sdp->exclude = 0; /* undo if error */
311 scsi_device_put(sdp->device);
315 /* Following function was formerly called 'sg_close' */
317 sg_release(struct inode *inode, struct file *filp)
322 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
324 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
325 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
326 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
327 if (!sdp->detached) {
328 scsi_device_put(sdp->device);
331 wake_up_interruptible(&sdp->o_excl_wait);
337 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
343 int req_pack_id = -1;
344 struct sg_header old_hdr;
348 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
350 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
351 sdp->disk->disk_name, (int) count));
352 if (ppos != &filp->f_pos) ; /* FIXME: Hmm. Seek to the right place, or fail? */
353 if ((k = verify_area(VERIFY_WRITE, buf, count)))
355 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
356 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
358 if (old_hdr.reply_len < 0) {
359 if (count >= SZ_SG_IO_HDR) {
361 (&new_hdr, buf, SZ_SG_IO_HDR))
363 req_pack_id = new_hdr.pack_id;
366 req_pack_id = old_hdr.pack_id;
368 srp = sg_get_rq_mark(sfp, req_pack_id);
369 if (!srp) { /* now wait on packet to arrive */
372 if (filp->f_flags & O_NONBLOCK)
375 res = 0; /* following is a macro that beats race condition */
376 __wait_event_interruptible(sfp->read_wait,
377 (sdp->detached || (srp = sg_get_rq_mark(sfp, req_pack_id))),
383 return res; /* -ERESTARTSYS because signal hit process */
386 if (srp->header.interface_id != '\0')
387 return sg_new_read(sfp, buf, count, srp);
390 memset(&old_hdr, 0, SZ_SG_HEADER);
391 old_hdr.reply_len = (int) hp->timeout;
392 old_hdr.pack_len = old_hdr.reply_len; /* very old, strange behaviour */
393 old_hdr.pack_id = hp->pack_id;
394 old_hdr.twelve_byte =
395 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
396 old_hdr.target_status = hp->masked_status;
397 old_hdr.host_status = hp->host_status;
398 old_hdr.driver_status = hp->driver_status;
399 if ((CHECK_CONDITION & hp->masked_status) ||
400 (DRIVER_SENSE & hp->driver_status))
401 memcpy(old_hdr.sense_buffer, srp->sense_b,
402 sizeof (old_hdr.sense_buffer));
403 switch (hp->host_status) {
404 /* This setup of 'result' is for backward compatibility and is best
405 ignored by the user who should use target, host + driver status */
407 case DID_PASSTHROUGH:
414 old_hdr.result = EBUSY;
421 old_hdr.result = EIO;
424 old_hdr.result = (srp->sense_b[0] == 0 &&
425 hp->masked_status == GOOD) ? 0 : EIO;
428 old_hdr.result = EIO;
432 /* Now copy the result back to the user buffer. */
433 if (count >= SZ_SG_HEADER) {
434 if (__copy_to_user(buf, &old_hdr, SZ_SG_HEADER))
437 if (count > old_hdr.reply_len)
438 count = old_hdr.reply_len;
439 if (count > SZ_SG_HEADER) {
441 sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)))
445 count = (old_hdr.result == 0) ? 0 : -EIO;
446 sg_finish_rem_req(srp);
451 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
453 sg_io_hdr_t *hp = &srp->header;
457 if (count < SZ_SG_IO_HDR) {
462 if ((hp->mx_sb_len > 0) && hp->sbp) {
463 if ((CHECK_CONDITION & hp->masked_status) ||
464 (DRIVER_SENSE & hp->driver_status)) {
465 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
466 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
467 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
468 len = (len > sb_len) ? sb_len : len;
469 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
476 if (hp->masked_status || hp->host_status || hp->driver_status)
477 hp->info |= SG_INFO_CHECK;
478 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
482 err = sg_read_xfer(srp);
484 sg_finish_rem_req(srp);
485 return (0 == err) ? count : err;
489 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
491 int mxsize, cmd_size, k;
492 int input_size, blocking;
493 unsigned char opcode;
497 struct sg_header old_hdr;
499 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
501 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
503 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
504 sdp->disk->disk_name, (int) count));
507 if (!((filp->f_flags & O_NONBLOCK) ||
508 scsi_block_when_processing_errors(sdp->device)))
510 if (ppos != &filp->f_pos) ; /* FIXME: Hmm. Seek to the right place, or fail? */
512 if ((k = verify_area(VERIFY_READ, buf, count)))
513 return k; /* protects following copy_from_user()s + get_user()s */
514 if (count < SZ_SG_HEADER)
516 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
518 blocking = !(filp->f_flags & O_NONBLOCK);
519 if (old_hdr.reply_len < 0)
520 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
521 if (count < (SZ_SG_HEADER + 6))
522 return -EIO; /* The minimum scsi command length is 6 bytes. */
524 if (!(srp = sg_add_request(sfp))) {
525 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
529 __get_user(opcode, buf);
530 if (sfp->next_cmd_len > 0) {
531 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
532 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
533 sfp->next_cmd_len = 0;
534 sg_remove_request(sfp, srp);
537 cmd_size = sfp->next_cmd_len;
538 sfp->next_cmd_len = 0; /* reset so only this write() effected */
540 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
541 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
544 SCSI_LOG_TIMEOUT(4, printk(
545 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
546 /* Determine buffer size. */
547 input_size = count - cmd_size;
548 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
549 mxsize -= SZ_SG_HEADER;
550 input_size -= SZ_SG_HEADER;
551 if (input_size < 0) {
552 sg_remove_request(sfp, srp);
553 return -EIO; /* User did not pass enough bytes for this command. */
556 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
557 hp->cmd_len = (unsigned char) cmd_size;
561 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
562 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
564 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
565 hp->dxfer_len = mxsize;
566 hp->dxferp = (char __user *)buf + cmd_size;
568 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
569 hp->flags = input_size; /* structure abuse ... */
570 hp->pack_id = old_hdr.pack_id;
572 if (__copy_from_user(cmnd, buf, cmd_size))
574 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
575 return (k < 0) ? k : count;
579 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
580 int blocking, int read_only, Sg_request ** o_srp)
585 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
588 if (count < SZ_SG_IO_HDR)
590 if ((k = verify_area(VERIFY_READ, buf, count)))
591 return k; /* protects following copy_from_user()s + get_user()s */
593 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
594 if (!(srp = sg_add_request(sfp))) {
595 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
599 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
600 sg_remove_request(sfp, srp);
603 if (hp->interface_id != 'S') {
604 sg_remove_request(sfp, srp);
607 if (hp->flags & SG_FLAG_MMAP_IO) {
608 if (hp->dxfer_len > sfp->reserve.bufflen) {
609 sg_remove_request(sfp, srp);
610 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
612 if (hp->flags & SG_FLAG_DIRECT_IO) {
613 sg_remove_request(sfp, srp);
614 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
616 if (sg_res_in_use(sfp)) {
617 sg_remove_request(sfp, srp);
618 return -EBUSY; /* reserve buffer already being used */
621 timeout = sg_ms_to_jif(srp->header.timeout);
622 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
623 sg_remove_request(sfp, srp);
626 if ((k = verify_area(VERIFY_READ, hp->cmdp, hp->cmd_len))) {
627 sg_remove_request(sfp, srp);
628 return k; /* protects following copy_from_user()s + get_user()s */
630 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
631 sg_remove_request(sfp, srp);
635 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
636 sg_remove_request(sfp, srp);
639 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
648 sg_common_write(Sg_fd * sfp, Sg_request * srp,
649 unsigned char *cmnd, int timeout, int blocking)
653 Sg_device *sdp = sfp->parentdp;
654 sg_io_hdr_t *hp = &srp->header;
657 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
659 hp->masked_status = 0;
663 hp->driver_status = 0;
665 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
666 (int) cmnd[0], (int) hp->cmd_len));
668 if ((k = sg_start_req(srp))) {
669 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
670 sg_finish_rem_req(srp);
671 return k; /* probably out of space --> ENOMEM */
673 if ((k = sg_write_xfer(srp))) {
674 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
675 sg_finish_rem_req(srp);
679 sg_finish_rem_req(srp);
682 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
684 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
685 sg_finish_rem_req(srp);
689 srp->my_cmdp = SRpnt;
690 q = SRpnt->sr_device->request_queue;
691 SRpnt->sr_request->rq_disk = sdp->disk;
692 SRpnt->sr_sense_buffer[0] = 0;
693 SRpnt->sr_cmd_len = hp->cmd_len;
694 SRpnt->sr_use_sg = srp->data.k_use_sg;
695 SRpnt->sr_sglist_len = srp->data.sglist_len;
696 SRpnt->sr_bufflen = srp->data.bufflen;
697 SRpnt->sr_underflow = 0;
698 SRpnt->sr_buffer = srp->data.buffer;
699 switch (hp->dxfer_direction) {
700 case SG_DXFER_TO_FROM_DEV:
701 case SG_DXFER_FROM_DEV:
702 SRpnt->sr_data_direction = SCSI_DATA_READ;
704 case SG_DXFER_TO_DEV:
705 SRpnt->sr_data_direction = SCSI_DATA_WRITE;
707 case SG_DXFER_UNKNOWN:
708 SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN;
711 SRpnt->sr_data_direction = SCSI_DATA_NONE;
714 SRpnt->upper_private_data = srp;
715 srp->data.k_use_sg = 0;
716 srp->data.sglist_len = 0;
717 srp->data.bufflen = 0;
718 srp->data.buffer = NULL;
719 hp->duration = jiffies; /* unit jiffies now, millisecs after done */
720 /* Now send everything of to mid-level. The next time we hear about this
721 packet is when sg_cmd_done() is called (i.e. a callback). */
722 scsi_do_req(SRpnt, (void *) cmnd,
723 (void *) SRpnt->sr_buffer, hp->dxfer_len,
724 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
725 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
729 static inline unsigned
730 sg_jif_to_ms(int jifs)
735 unsigned int j = (unsigned int) jifs;
737 (UINT_MAX / 1000)) ? ((j * 1000) / HZ) : ((j / HZ) *
743 sg_ioctl(struct inode *inode, struct file *filp,
744 unsigned int cmd_in, unsigned long arg)
746 void __user *p = (void __user *)arg;
748 int result, val, read_only;
752 unsigned long iflags;
754 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
756 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
757 sdp->disk->disk_name, (int) cmd_in));
758 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
763 int blocking = 1; /* ignore O_NONBLOCK flag */
767 if (!scsi_block_when_processing_errors(sdp->device))
769 result = verify_area(VERIFY_WRITE, p, SZ_SG_IO_HDR);
773 sg_new_write(sfp, p, SZ_SG_IO_HDR,
774 blocking, read_only, &srp);
777 srp->sg_io_owned = 1;
779 result = 0; /* following macro to beat race condition */
780 __wait_event_interruptible(sfp->read_wait,
781 (sdp->detached || sfp->closed || srp->done),
786 return 0; /* request packet dropped already */
790 return result; /* -ERESTARTSYS because signal hit process */
793 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
794 return (result < 0) ? result : 0;
797 result = get_user(val, ip);
802 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
803 val = MULDIV (INT_MAX, USER_HZ, HZ);
804 sfp->timeout_user = val;
805 sfp->timeout = MULDIV (val, HZ, USER_HZ);
808 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
809 /* strange ..., for backward compatibility */
810 return sfp->timeout_user;
811 case SG_SET_FORCE_LOW_DMA:
812 result = get_user(val, ip);
817 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
818 val = (int) sfp->reserve.bufflen;
819 sg_remove_scat(&sfp->reserve);
820 sg_build_reserve(sfp, val);
825 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
829 return put_user((int) sfp->low_dma, ip);
832 verify_area(VERIFY_WRITE, p, sizeof (sg_scsi_id_t));
836 sg_scsi_id_t __user *sg_idp = p;
840 __put_user((int) sdp->device->host->host_no,
842 __put_user((int) sdp->device->channel,
844 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
845 __put_user((int) sdp->device->lun, &sg_idp->lun);
846 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
847 __put_user((short) sdp->device->host->cmd_per_lun,
848 &sg_idp->h_cmd_per_lun);
849 __put_user((short) sdp->device->queue_depth,
850 &sg_idp->d_queue_depth);
851 __put_user(0, &sg_idp->unused[0]);
852 __put_user(0, &sg_idp->unused[1]);
855 case SG_SET_FORCE_PACK_ID:
856 result = get_user(val, ip);
859 sfp->force_packid = val ? 1 : 0;
862 result = verify_area(VERIFY_WRITE, ip, sizeof (int));
865 read_lock_irqsave(&sfp->rq_list_lock, iflags);
866 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
867 if ((1 == srp->done) && (!srp->sg_io_owned)) {
868 read_unlock_irqrestore(&sfp->rq_list_lock,
870 __put_user(srp->header.pack_id, ip);
874 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
877 case SG_GET_NUM_WAITING:
878 read_lock_irqsave(&sfp->rq_list_lock, iflags);
879 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
880 if ((1 == srp->done) && (!srp->sg_io_owned))
883 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
884 return put_user(val, ip);
885 case SG_GET_SG_TABLESIZE:
886 return put_user(sdp->sg_tablesize, ip);
887 case SG_SET_RESERVED_SIZE:
888 result = get_user(val, ip);
893 if (val != sfp->reserve.bufflen) {
894 if (sg_res_in_use(sfp) || sfp->mmap_called)
896 sg_remove_scat(&sfp->reserve);
897 sg_build_reserve(sfp, val);
900 case SG_GET_RESERVED_SIZE:
901 val = (int) sfp->reserve.bufflen;
902 return put_user(val, ip);
903 case SG_SET_COMMAND_Q:
904 result = get_user(val, ip);
907 sfp->cmd_q = val ? 1 : 0;
909 case SG_GET_COMMAND_Q:
910 return put_user((int) sfp->cmd_q, ip);
911 case SG_SET_KEEP_ORPHAN:
912 result = get_user(val, ip);
915 sfp->keep_orphan = val;
917 case SG_GET_KEEP_ORPHAN:
918 return put_user((int) sfp->keep_orphan, ip);
919 case SG_NEXT_CMD_LEN:
920 result = get_user(val, ip);
923 sfp->next_cmd_len = (val > 0) ? val : 0;
925 case SG_GET_VERSION_NUM:
926 return put_user(sg_version_num, ip);
927 case SG_GET_ACCESS_COUNT:
928 /* faked - we don't have a real access count anymore */
929 val = (sdp->device ? 1 : 0);
930 return put_user(val, ip);
931 case SG_GET_REQUEST_TABLE:
932 result = verify_area(VERIFY_WRITE, p,
933 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
937 sg_req_info_t rinfo[SG_MAX_QUEUE];
939 read_lock_irqsave(&sfp->rq_list_lock, iflags);
940 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
941 ++val, srp = srp ? srp->nextrp : srp) {
942 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
944 rinfo[val].req_state = srp->done + 1;
946 srp->header.masked_status &
947 srp->header.host_status &
948 srp->header.driver_status;
949 rinfo[val].duration =
950 srp->done ? srp->header.duration :
952 jiffies - srp->header.duration);
953 rinfo[val].orphan = srp->orphan;
954 rinfo[val].sg_io_owned = srp->sg_io_owned;
955 rinfo[val].pack_id = srp->header.pack_id;
956 rinfo[val].usr_ptr = srp->header.usr_ptr;
959 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
960 return (__copy_to_user(p, rinfo,
961 SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0);
963 case SG_EMULATED_HOST:
966 return put_user(sdp->device->host->hostt->emulated, ip);
970 if (filp->f_flags & O_NONBLOCK) {
971 if (test_bit(SHOST_RECOVERY,
972 &sdp->device->host->shost_state))
974 } else if (!scsi_block_when_processing_errors(sdp->device))
976 result = get_user(val, ip);
979 if (SG_SCSI_RESET_NOTHING == val)
982 case SG_SCSI_RESET_DEVICE:
983 val = SCSI_TRY_RESET_DEVICE;
985 case SG_SCSI_RESET_BUS:
986 val = SCSI_TRY_RESET_BUS;
988 case SG_SCSI_RESET_HOST:
989 val = SCSI_TRY_RESET_HOST;
994 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
996 return (scsi_reset_provider(sdp->device, val) ==
998 case SCSI_IOCTL_SEND_COMMAND:
1002 unsigned char opcode = WRITE_6;
1003 Scsi_Ioctl_Command __user *siocp = p;
1005 if (copy_from_user(&opcode, siocp->data, 1))
1007 if (!sg_allow_access(opcode, sdp->device->type))
1010 return scsi_ioctl_send_command(sdp->device, p);
1012 result = get_user(val, ip);
1015 sdp->sgdebug = (char) val;
1017 case SCSI_IOCTL_GET_IDLUN:
1018 case SCSI_IOCTL_GET_BUS_NUMBER:
1019 case SCSI_IOCTL_PROBE_HOST:
1020 case SG_GET_TRANSFORM:
1023 return scsi_ioctl(sdp->device, cmd_in, p);
1026 return -EPERM; /* don't know so take safe approach */
1027 return scsi_ioctl(sdp->device, cmd_in, p);
1032 sg_poll(struct file *filp, poll_table * wait)
1034 unsigned int res = 0;
1039 unsigned long iflags;
1041 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1044 poll_wait(filp, &sfp->read_wait, wait);
1045 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1046 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1047 /* if any read waiting, flag it */
1048 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1049 res = POLLIN | POLLRDNORM;
1052 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1056 else if (!sfp->cmd_q) {
1058 res |= POLLOUT | POLLWRNORM;
1059 } else if (count < SG_MAX_QUEUE)
1060 res |= POLLOUT | POLLWRNORM;
1061 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1062 sdp->disk->disk_name, (int) res));
1067 sg_fasync(int fd, struct file *filp, int mode)
1073 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1075 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1076 sdp->disk->disk_name, mode));
1078 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1079 return (retval < 0) ? retval : 0;
1082 static inline unsigned char *
1083 sg_scatg2virt(const struct scatterlist *sclp)
1085 return (sclp && sclp->page) ?
1086 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1089 /* When startFinish==1 increments page counts for pages other than the
1090 first of scatter gather elements obtained from __get_free_pages().
1091 When startFinish==0 decrements ... */
1093 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1099 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1100 startFinish, rsv_schp->k_use_sg));
1101 /* N.B. correction _not_ applied to base page of each allocation */
1102 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1103 struct scatterlist *sclp = rsv_schp->buffer;
1105 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1106 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1107 page_ptr = sg_scatg2virt(sclp) + m;
1108 page = virt_to_page(page_ptr);
1112 if (page_count(page) > 0)
1117 } else { /* reserve buffer is just a single allocation */
1118 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1119 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1120 page = virt_to_page(page_ptr);
1124 if (page_count(page) > 0)
1131 static struct page *
1132 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1135 struct page *page = NOPAGE_SIGBUS;
1136 void *page_ptr = NULL;
1137 unsigned long offset;
1138 Sg_scatter_hold *rsv_schp;
1140 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1142 rsv_schp = &sfp->reserve;
1143 offset = addr - vma->vm_start;
1144 if (offset >= rsv_schp->bufflen)
1146 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1147 offset, rsv_schp->k_use_sg));
1148 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1150 unsigned long sa = vma->vm_start;
1152 struct scatterlist *sclp = rsv_schp->buffer;
1154 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1156 len = vma->vm_end - sa;
1157 len = (len < sclp->length) ? len : sclp->length;
1159 page_ptr = sg_scatg2virt(sclp) + offset;
1160 page = virt_to_page(page_ptr);
1161 get_page(page); /* increment page count */
1167 } else { /* reserve buffer is just a single allocation */
1168 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1169 page = virt_to_page(page_ptr);
1170 get_page(page); /* increment page count */
1173 *type = VM_FAULT_MINOR;
1177 static struct vm_operations_struct sg_mmap_vm_ops = {
1178 .nopage = sg_vma_nopage,
1182 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1185 unsigned long req_sz = vma->vm_end - vma->vm_start;
1186 Sg_scatter_hold *rsv_schp;
1188 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1190 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1191 (void *) vma->vm_start, (int) req_sz));
1193 return -EINVAL; /* want no offset */
1194 rsv_schp = &sfp->reserve;
1195 if (req_sz > rsv_schp->bufflen)
1196 return -ENOMEM; /* cannot map more than reserved buffer */
1198 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1200 unsigned long sa = vma->vm_start;
1202 struct scatterlist *sclp = rsv_schp->buffer;
1204 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1206 if (0 != sclp->offset)
1207 return -EFAULT; /* non page aligned memory ?? */
1208 len = vma->vm_end - sa;
1209 len = (len < sclp->length) ? len : sclp->length;
1212 } else { /* reserve buffer is just a single allocation */
1213 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1214 return -EFAULT; /* non page aligned memory ?? */
1216 if (0 == sfp->mmap_called) {
1217 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1218 sfp->mmap_called = 1;
1220 vma->vm_flags |= (VM_RESERVED | VM_IO);
1221 vma->vm_private_data = sfp;
1222 vma->vm_ops = &sg_mmap_vm_ops;
1226 /* This function is a "bottom half" handler that is called by the
1227 * mid level when a command is completed (or has failed). */
1229 sg_cmd_done(Scsi_Cmnd * SCpnt)
1231 Scsi_Request *SRpnt = NULL;
1232 Sg_device *sdp = NULL;
1234 Sg_request *srp = NULL;
1236 if (SCpnt && (SRpnt = SCpnt->sc_request))
1237 srp = (Sg_request *) SRpnt->upper_private_data;
1239 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1241 scsi_release_request(SRpnt);
1244 sfp = srp->parentfp;
1246 sdp = sfp->parentdp;
1247 if ((NULL == sdp) || sdp->detached) {
1248 printk(KERN_INFO "sg_cmd_done: device detached\n");
1249 scsi_release_request(SRpnt);
1253 /* First transfer ownership of data buffers to sg_device object. */
1254 srp->data.k_use_sg = SRpnt->sr_use_sg;
1255 srp->data.sglist_len = SRpnt->sr_sglist_len;
1256 srp->data.bufflen = SRpnt->sr_bufflen;
1257 srp->data.buffer = SRpnt->sr_buffer;
1258 /* now clear out request structure */
1259 SRpnt->sr_use_sg = 0;
1260 SRpnt->sr_sglist_len = 0;
1261 SRpnt->sr_bufflen = 0;
1262 SRpnt->sr_buffer = NULL;
1263 SRpnt->sr_underflow = 0;
1264 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1266 srp->my_cmdp = NULL;
1268 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1269 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1270 srp->header.resid = SCpnt->resid;
1271 /* N.B. unit of duration changes here from jiffies to millisecs */
1272 srp->header.duration =
1273 sg_jif_to_ms(jiffies - (int) srp->header.duration);
1274 if (0 != SRpnt->sr_result) {
1275 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1276 sizeof (srp->sense_b));
1277 srp->header.status = 0xff & SRpnt->sr_result;
1278 srp->header.masked_status = status_byte(SRpnt->sr_result);
1279 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1280 srp->header.host_status = host_byte(SRpnt->sr_result);
1281 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1282 if ((sdp->sgdebug > 0) &&
1283 ((CHECK_CONDITION == srp->header.masked_status) ||
1284 (COMMAND_TERMINATED == srp->header.masked_status)))
1285 print_req_sense("sg_cmd_done", SRpnt);
1287 /* Following if statement is a patch supplied by Eric Youngdale */
1288 if (driver_byte(SRpnt->sr_result) != 0
1289 && (SRpnt->sr_sense_buffer[0] & 0x7f) == 0x70
1290 && (SRpnt->sr_sense_buffer[2] & 0xf) == UNIT_ATTENTION
1291 && sdp->device->removable) {
1292 /* Detected disc change. Set the bit - this may be used if */
1293 /* there are filesystems using this device. */
1294 sdp->device->changed = 1;
1297 /* Rely on write phase to clean out srp status values, so no "else" */
1299 scsi_release_request(SRpnt);
1301 if (sfp->closed) { /* whoops this fd already released, cleanup */
1302 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1303 sg_finish_rem_req(srp);
1305 if (NULL == sfp->headrp) {
1306 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1307 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1308 scsi_device_put(sdp->device);
1312 } else if (srp && srp->orphan) {
1313 if (sfp->keep_orphan)
1314 srp->sg_io_owned = 0;
1316 sg_finish_rem_req(srp);
1321 /* Now wake up any sg_read() that is waiting for this packet. */
1322 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1324 wake_up_interruptible(&sfp->read_wait);
1328 static struct file_operations sg_fops = {
1329 .owner = THIS_MODULE,
1336 .release = sg_release,
1337 .fasync = sg_fasync,
1340 static struct class_simple * sg_sysfs_class;
1342 static int sg_sysfs_valid = 0;
1344 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1347 unsigned long iflags;
1348 void *old_sg_dev_arr = NULL;
1351 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
1353 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1357 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1358 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1360 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1361 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1363 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1364 if (unlikely(!tmp_da))
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, sg_dev_max * sizeof(Sg_device *));
1370 old_sg_dev_arr = sg_dev_arr;
1371 sg_dev_arr = tmp_da;
1372 sg_dev_max = tmp_dev_max;
1375 for (k = 0; k < sg_dev_max; k++)
1378 if (unlikely(k >= SG_MAX_DEVS))
1381 memset(sdp, 0, sizeof(*sdp));
1382 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1383 sprintf(disk->disk_name, "sg%d", k);
1384 disk->first_minor = k;
1386 sdp->device = scsidp;
1387 init_waitqueue_head(&sdp->o_excl_wait);
1388 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1391 sg_dev_arr[k] = sdp;
1392 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1398 kfree(old_sg_dev_arr);
1402 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1407 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1409 "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
1410 "number exceeds %d\n", scsidp->host->host_no, scsidp->channel,
1411 scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
1417 sg_add(struct class_device *cl_dev)
1419 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1420 struct gendisk *disk;
1421 Sg_device *sdp = NULL;
1422 struct cdev * cdev = NULL;
1425 disk = alloc_disk(1);
1427 printk(KERN_WARNING "alloc_disk failed\n");
1430 disk->major = SCSI_GENERIC_MAJOR;
1433 cdev = cdev_alloc();
1435 printk(KERN_WARNING "cdev_alloc failed\n");
1438 cdev->owner = THIS_MODULE;
1439 cdev->ops = &sg_fops;
1441 error = sg_alloc(disk, scsidp);
1443 printk(KERN_WARNING "sg_alloc failed\n");
1447 sdp = sg_dev_arr[k];
1449 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1450 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1451 "%s/generic", scsidp->devfs_name);
1452 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1454 devfs_remove("%s/generic", scsidp->devfs_name);
1458 if (sg_sysfs_valid) {
1459 struct class_device * sg_class_member;
1461 sg_class_member = class_simple_device_add(sg_sysfs_class,
1462 MKDEV(SCSI_GENERIC_MAJOR, k),
1465 if (IS_ERR(sg_class_member))
1466 printk(KERN_WARNING "sg_add: "
1467 "class_simple_device_add failed\n");
1468 class_set_devdata(sg_class_member, sdp);
1469 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1470 &sg_class_member->kobj, "generic");
1472 printk(KERN_ERR "sg_add: unable to make symlink "
1473 "'generic' back to sg%d\n", k);
1475 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1478 "Attached scsi generic sg%d at scsi%d, channel"
1479 " %d, id %d, lun %d, type %d\n", k,
1480 scsidp->host->host_no, scsidp->channel, scsidp->id,
1481 scsidp->lun, scsidp->type);
1493 sg_remove(struct class_device *cl_dev)
1495 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1496 Sg_device *sdp = NULL;
1497 unsigned long iflags;
1504 if (NULL == sg_dev_arr)
1507 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1508 for (k = 0; k < sg_dev_max; k++) {
1509 sdp = sg_dev_arr[k];
1510 if ((NULL == sdp) || (sdp->device != scsidp))
1511 continue; /* dirty but lowers nesting */
1514 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1516 for (srp = sfp->headrp; srp; srp = tsrp) {
1518 if (sfp->closed || (0 == srp->done))
1519 sg_finish_rem_req(srp);
1522 scsi_device_put(sdp->device);
1523 __sg_remove_sfp(sdp, sfp);
1526 wake_up_interruptible(&sfp->read_wait);
1527 kill_fasync(&sfp->async_qp, SIGPOLL,
1531 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1532 if (NULL == sdp->headfp) {
1533 sg_dev_arr[k] = NULL;
1535 } else { /* nothing active, simple case */
1536 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1537 sg_dev_arr[k] = NULL;
1542 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1545 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1546 class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k));
1547 cdev_del(sdp->cdev);
1549 devfs_remove("%s/generic", scsidp->devfs_name);
1550 put_disk(sdp->disk);
1552 if (NULL == sdp->headfp)
1553 kfree((char *) sdp);
1557 scsi_sleep(2); /* dirty detach so delay device destruction */
1560 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1561 * of sysfs parameters (which module_param doesn't yet support).
1562 * Sysfs parameters defined explicitly below.
1564 module_param_named(def_reserved_size, def_reserved_size, int, 0);
1565 module_param_named(allow_dio, sg_allow_dio, int, 0);
1567 MODULE_AUTHOR("Douglas Gilbert");
1568 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1569 MODULE_LICENSE("GPL");
1570 MODULE_VERSION(SG_VERSION_STR);
1572 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1573 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1580 if (def_reserved_size >= 0)
1581 sg_big_buff = def_reserved_size;
1583 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1587 sg_sysfs_class = class_simple_create(THIS_MODULE, "scsi_generic");
1588 if ( IS_ERR(sg_sysfs_class) ) {
1589 rc = PTR_ERR(sg_sysfs_class);
1593 rc = scsi_register_interface(&sg_interface);
1595 #ifdef CONFIG_SCSI_PROC_FS
1597 #endif /* CONFIG_SCSI_PROC_FS */
1600 class_simple_destroy(sg_sysfs_class);
1602 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1609 #ifdef CONFIG_SCSI_PROC_FS
1611 #endif /* CONFIG_SCSI_PROC_FS */
1612 scsi_unregister_interface(&sg_interface);
1613 class_simple_destroy(sg_sysfs_class);
1615 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1617 if (sg_dev_arr != NULL) {
1618 kfree((char *) sg_dev_arr);
1625 sg_start_req(Sg_request * srp)
1628 Sg_fd *sfp = srp->parentfp;
1629 sg_io_hdr_t *hp = &srp->header;
1630 int dxfer_len = (int) hp->dxfer_len;
1631 int dxfer_dir = hp->dxfer_direction;
1632 Sg_scatter_hold *req_schp = &srp->data;
1633 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1635 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1636 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1638 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1639 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1640 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1641 res = sg_build_direct(srp, sfp, dxfer_len);
1642 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1645 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1646 sg_link_reserve(sfp, srp, dxfer_len);
1648 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1650 sg_remove_scat(req_schp);
1658 sg_finish_rem_req(Sg_request * srp)
1660 Sg_fd *sfp = srp->parentfp;
1661 Sg_scatter_hold *req_schp = &srp->data;
1663 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1665 sg_unlink_reserve(sfp, srp);
1667 sg_remove_scat(req_schp);
1668 sg_remove_request(sfp, srp);
1672 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1675 int elem_sz = sizeof (struct scatterlist);
1676 int sg_bufflen = tablesize * elem_sz;
1677 int mx_sc_elems = tablesize;
1679 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1682 else if (ret_sz != sg_bufflen) {
1683 sg_bufflen = ret_sz;
1684 mx_sc_elems = sg_bufflen / elem_sz;
1686 schp->sglist_len = sg_bufflen;
1687 memset(schp->buffer, 0, sg_bufflen);
1688 return mx_sc_elems; /* number of scat_gath elements allocated */
1691 #ifdef SG_ALLOW_DIO_CODE
1692 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1693 /* hopefully this generic code will moved to a library */
1695 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1696 - mapping of all pages not successful
1697 - any page is above max_pfn
1698 (i.e., either completely successful or fails)
1701 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1702 unsigned long uaddr, size_t count, int rw,
1703 unsigned long max_pfn)
1706 unsigned int nr_pages;
1707 struct page **pages;
1709 nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
1711 /* User attempted Overflow! */
1712 if ((uaddr + count) < uaddr)
1716 if (nr_pages > max_pages)
1723 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1726 /* Try to fault in all of the necessary pages */
1727 down_read(¤t->mm->mmap_sem);
1728 /* rw==READ means read from drive, write into memory area */
1729 res = get_user_pages(
1735 0, /* don't force */
1738 up_read(¤t->mm->mmap_sem);
1740 /* Errors and no page mapped should return here */
1744 for (i=0; i < nr_pages; i++) {
1745 /* FIXME: flush superflous for rw==READ,
1746 * probably wrong function for rw==WRITE
1748 flush_dcache_page(pages[i]);
1749 if (page_to_pfn(pages[i]) > max_pfn)
1751 /* ?? Is locking needed? I don't think so */
1752 /* if (TestSetPageLocked(pages[i]))
1756 /* Populate the scatter/gather list */
1757 sgl[0].page = pages[0];
1758 sgl[0].offset = uaddr & ~PAGE_MASK;
1760 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1761 count -= sgl[0].length;
1762 for (i=1; i < nr_pages ; i++) {
1764 sgl[i].page = pages[i];
1765 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1770 sgl[0].length = count;
1777 /* for (j=0; j < i; j++)
1778 unlock_page(pages[j]); */
1782 for (j=0; j < res; j++)
1783 page_cache_release(pages[j]);
1789 /* And unmap them... */
1791 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1796 for (i=0; i < nr_pages; i++) {
1797 if (dirtied && !PageReserved(sgl[i].page))
1798 SetPageDirty(sgl[i].page);
1799 /* unlock_page(sgl[i].page); */
1800 /* FIXME: cache flush missing for rw==READ
1801 * FIXME: call the correct reference counting function
1803 page_cache_release(sgl[i].page);
1809 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1813 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1815 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1817 #ifdef SG_ALLOW_DIO_CODE
1818 sg_io_hdr_t *hp = &srp->header;
1819 Sg_scatter_hold *schp = &srp->data;
1820 int sg_tablesize = sfp->parentdp->sg_tablesize;
1821 struct scatterlist *sgl;
1822 int mx_sc_elems, res;
1823 struct scsi_device *sdev = sfp->parentdp->device;
1825 if (((unsigned long)hp->dxferp &
1826 queue_dma_alignment(sdev->request_queue)) != 0)
1828 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1829 if (mx_sc_elems <= 0) {
1832 sgl = (struct scatterlist *)schp->buffer;
1833 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1834 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1837 schp->k_use_sg = res;
1838 schp->dio_in_use = 1;
1839 hp->info |= SG_INFO_DIRECT_IO;
1847 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1850 int blk_size = buff_size;
1851 unsigned char *p = NULL;
1853 if ((blk_size < 0) || (!sfp))
1856 ++blk_size; /* don't know why */
1857 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1858 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1859 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1860 buff_size, blk_size));
1861 if (blk_size <= SG_SCATTER_SZ) {
1862 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1865 if (blk_size == ret_sz) { /* got it on the first attempt */
1868 schp->bufflen = blk_size;
1869 schp->b_malloc_len = blk_size;
1873 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1877 /* Want some local declarations, so start new block ... */
1878 { /* lets try and build a scatter gather list */
1879 struct scatterlist *sclp;
1882 int sg_tablesize = sfp->parentdp->sg_tablesize;
1885 /* N.B. ret_sz carried into this block ... */
1886 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1887 if (mx_sc_elems < 0)
1888 return mx_sc_elems; /* most likely -ENOMEM */
1890 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1891 (rem_sz > 0) && (k < mx_sc_elems);
1892 ++k, rem_sz -= ret_sz, ++sclp) {
1898 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1899 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1903 sclp->page = virt_to_page(p);
1904 sclp->offset = offset_in_page(p);
1905 sclp->length = ret_sz;
1907 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1908 k, sg_scatg2virt(sclp), ret_sz));
1909 } /* end of for loop */
1911 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1912 schp->bufflen = blk_size;
1913 if (rem_sz > 0) /* must have failed */
1920 sg_write_xfer(Sg_request * srp)
1922 sg_io_hdr_t *hp = &srp->header;
1923 Sg_scatter_hold *schp = &srp->data;
1925 int j, k, onum, usglen, ksglen, res;
1926 int iovec_count = (int) hp->iovec_count;
1927 int dxfer_dir = hp->dxfer_direction;
1929 unsigned char __user *up;
1930 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1932 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1933 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1934 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1935 if (schp->bufflen < num_xfer)
1936 num_xfer = schp->bufflen;
1938 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1940 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1943 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1944 num_xfer, iovec_count, schp->k_use_sg));
1947 if ((k = verify_area(VERIFY_READ, hp->dxferp,
1948 SZ_SG_IOVEC * onum)))
1953 if (0 == schp->k_use_sg) { /* kernel has single buffer */
1954 for (j = 0, p = schp->buffer; j < onum; ++j) {
1955 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1958 usglen = (num_xfer > usglen) ? usglen : num_xfer;
1959 if (__copy_from_user(p, up, usglen))
1966 } else { /* kernel using scatter gather list */
1967 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
1969 ksglen = (int) sclp->length;
1970 p = sg_scatg2virt(sclp);
1971 for (j = 0, k = 0; j < onum; ++j) {
1972 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1976 for (; p; ++sclp, ksglen = (int) sclp->length,
1977 p = sg_scatg2virt(sclp)) {
1980 if (ksglen > usglen) {
1981 if (usglen >= num_xfer) {
1982 if (__copy_from_user
1987 if (__copy_from_user(p, up, usglen))
1993 if (ksglen >= num_xfer) {
1994 if (__copy_from_user
1999 if (__copy_from_user(p, up, ksglen))
2005 if (k >= schp->k_use_sg)
2014 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
2015 int wr_xf, int *countp, unsigned char __user **up)
2017 int num_xfer = (int) hp->dxfer_len;
2018 unsigned char __user *p = hp->dxferp;
2022 if (wr_xf && ('\0' == hp->interface_id))
2023 count = (int) hp->flags; /* holds "old" input_size */
2028 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2031 count = (int) iovec.iov_len;
2033 if ((k = verify_area(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)))
2043 sg_remove_scat(Sg_scatter_hold * schp)
2045 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2046 if (schp->buffer && (schp->sglist_len > 0)) {
2047 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2049 if (schp->dio_in_use) {
2050 #ifdef SG_ALLOW_DIO_CODE
2051 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2056 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2058 SCSI_LOG_TIMEOUT(5, printk(
2059 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2060 k, sg_scatg2virt(sclp), sclp->length));
2061 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2067 sg_page_free(schp->buffer, schp->sglist_len);
2068 } else if (schp->buffer)
2069 sg_page_free(schp->buffer, schp->b_malloc_len);
2070 memset(schp, 0, sizeof (*schp));
2074 sg_read_xfer(Sg_request * srp)
2076 sg_io_hdr_t *hp = &srp->header;
2077 Sg_scatter_hold *schp = &srp->data;
2079 int j, k, onum, usglen, ksglen, res;
2080 int iovec_count = (int) hp->iovec_count;
2081 int dxfer_dir = hp->dxfer_direction;
2083 unsigned char __user *up;
2084 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2086 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2087 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2088 num_xfer = hp->dxfer_len;
2089 if (schp->bufflen < num_xfer)
2090 num_xfer = schp->bufflen;
2092 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2094 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2097 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2098 num_xfer, iovec_count, schp->k_use_sg));
2101 if ((k = verify_area(VERIFY_READ, hp->dxferp,
2102 SZ_SG_IOVEC * onum)))
2107 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2108 for (j = 0, p = schp->buffer; j < onum; ++j) {
2109 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2112 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2113 if (__copy_to_user(up, p, usglen))
2120 } else { /* kernel using scatter gather list */
2121 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2123 ksglen = (int) sclp->length;
2124 p = sg_scatg2virt(sclp);
2125 for (j = 0, k = 0; j < onum; ++j) {
2126 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2130 for (; p; ++sclp, ksglen = (int) sclp->length,
2131 p = sg_scatg2virt(sclp)) {
2134 if (ksglen > usglen) {
2135 if (usglen >= num_xfer) {
2141 if (__copy_to_user(up, p, usglen))
2147 if (ksglen >= num_xfer) {
2153 if (__copy_to_user(up, p, ksglen))
2159 if (k >= schp->k_use_sg)
2168 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2170 Sg_scatter_hold *schp = &srp->data;
2172 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2174 if ((!outp) || (num_read_xfer <= 0))
2176 if (schp->k_use_sg > 0) {
2178 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2180 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2182 num = (int) sclp->length;
2183 if (num > num_read_xfer) {
2185 (outp, sg_scatg2virt(sclp), num_read_xfer))
2190 (outp, sg_scatg2virt(sclp), num))
2192 num_read_xfer -= num;
2193 if (num_read_xfer <= 0)
2199 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2206 sg_build_reserve(Sg_fd * sfp, int req_size)
2208 Sg_scatter_hold *schp = &sfp->reserve;
2210 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2212 if (req_size < PAGE_SIZE)
2213 req_size = PAGE_SIZE;
2214 if (0 == sg_build_indirect(schp, sfp, req_size))
2217 sg_remove_scat(schp);
2218 req_size >>= 1; /* divide by 2 */
2219 } while (req_size > (PAGE_SIZE / 2));
2223 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2225 Sg_scatter_hold *req_schp = &srp->data;
2226 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2229 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2230 size = (size + 1) & (~1); /* round to even for aha1542 */
2231 if (rsv_schp->k_use_sg > 0) {
2234 struct scatterlist *sclp =
2235 (struct scatterlist *) rsv_schp->buffer;
2237 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2238 num = (int) sclp->length;
2241 req_schp->k_use_sg = 0;
2242 req_schp->buffer = sg_scatg2virt(sclp);
2244 sfp->save_scat_len = num;
2245 sclp->length = (unsigned) rem;
2246 req_schp->k_use_sg = k + 1;
2247 req_schp->sglist_len =
2248 rsv_schp->sglist_len;
2249 req_schp->buffer = rsv_schp->buffer;
2251 req_schp->bufflen = size;
2252 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2257 if (k >= rsv_schp->k_use_sg)
2258 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2260 req_schp->k_use_sg = 0;
2261 req_schp->bufflen = size;
2262 req_schp->buffer = rsv_schp->buffer;
2263 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2268 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2270 Sg_scatter_hold *req_schp = &srp->data;
2271 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2273 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2274 (int) req_schp->k_use_sg));
2275 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2276 struct scatterlist *sclp =
2277 (struct scatterlist *) rsv_schp->buffer;
2279 if (sfp->save_scat_len > 0)
2280 (sclp + (req_schp->k_use_sg - 1))->length =
2281 (unsigned) sfp->save_scat_len;
2283 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2285 req_schp->k_use_sg = 0;
2286 req_schp->bufflen = 0;
2287 req_schp->buffer = NULL;
2288 req_schp->sglist_len = 0;
2289 sfp->save_scat_len = 0;
2294 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2297 unsigned long iflags;
2299 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2300 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2301 /* look for requests that are ready + not SG_IO owned */
2302 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2303 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2304 resp->done = 2; /* guard against other readers */
2308 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2312 #ifdef CONFIG_SCSI_PROC_FS
2314 sg_get_nth_request(Sg_fd * sfp, int nth)
2317 unsigned long iflags;
2320 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2321 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2322 ++k, resp = resp->nextrp) ;
2323 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2328 /* always adds to end of list */
2330 sg_add_request(Sg_fd * sfp)
2333 unsigned long iflags;
2335 Sg_request *rp = sfp->req_arr;
2337 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2340 memset(rp, 0, sizeof (Sg_request));
2345 if (0 == sfp->cmd_q)
2346 resp = NULL; /* command queuing disallowed */
2348 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2352 if (k < SG_MAX_QUEUE) {
2353 memset(rp, 0, sizeof (Sg_request));
2355 while (resp->nextrp)
2356 resp = resp->nextrp;
2364 resp->nextrp = NULL;
2365 resp->header.duration = jiffies;
2366 resp->my_cmdp = NULL;
2368 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2372 /* Return of 1 for found; 0 for not found */
2374 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2376 Sg_request *prev_rp;
2378 unsigned long iflags;
2381 if ((!sfp) || (!srp) || (!sfp->headrp))
2383 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2384 prev_rp = sfp->headrp;
2385 if (srp == prev_rp) {
2386 sfp->headrp = prev_rp->nextrp;
2387 prev_rp->parentfp = NULL;
2390 while ((rp = prev_rp->nextrp)) {
2392 prev_rp->nextrp = rp->nextrp;
2393 rp->parentfp = NULL;
2400 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2404 #ifdef CONFIG_SCSI_PROC_FS
2406 sg_get_nth_sfp(Sg_device * sdp, int nth)
2409 unsigned long iflags;
2412 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2413 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2414 ++k, resp = resp->nextfp) ;
2415 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2421 sg_add_sfp(Sg_device * sdp, int dev)
2424 unsigned long iflags;
2426 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL);
2429 memset(sfp, 0, sizeof (Sg_fd));
2430 init_waitqueue_head(&sfp->read_wait);
2431 sfp->rq_list_lock = RW_LOCK_UNLOCKED;
2433 sfp->timeout = SG_DEFAULT_TIMEOUT;
2434 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2435 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2436 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2437 sdp->device->host->unchecked_isa_dma : 1;
2438 sfp->cmd_q = SG_DEF_COMMAND_Q;
2439 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2440 sfp->parentdp = sdp;
2441 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2444 else { /* add to tail of existing list */
2445 Sg_fd *pfp = sdp->headfp;
2450 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2451 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2452 sg_build_reserve(sfp, sg_big_buff);
2453 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2454 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2459 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2464 prev_fp = sdp->headfp;
2466 sdp->headfp = prev_fp->nextfp;
2468 while ((fp = prev_fp->nextfp)) {
2470 prev_fp->nextfp = fp->nextfp;
2476 if (sfp->reserve.bufflen > 0) {
2478 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2479 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2480 if (sfp->mmap_called)
2481 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2482 sg_remove_scat(&sfp->reserve);
2484 sfp->parentdp = NULL;
2485 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2486 sg_page_free((char *) sfp, sizeof (Sg_fd));
2489 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2491 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2498 for (srp = sfp->headrp; srp; srp = tsrp) {
2501 sg_finish_rem_req(srp);
2506 unsigned long iflags;
2508 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2509 __sg_remove_sfp(sdp, sfp);
2510 if (sdp->detached && (NULL == sdp->headfp)) {
2514 for (k = 0; k < maxd; ++k) {
2515 if (sdp == sg_dev_arr[k])
2519 sg_dev_arr[k] = NULL;
2520 kfree((char *) sdp);
2523 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2525 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2526 /* only bump the access_count if we actually succeeded in
2527 * throwing another counter on the host module */
2528 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2529 sfp->closed = 1; /* flag dirty state on this fd */
2530 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2537 sg_res_in_use(Sg_fd * sfp)
2539 const Sg_request *srp;
2540 unsigned long iflags;
2542 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2543 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2546 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2550 /* If retSzp==NULL want exact size or fail */
2552 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2563 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2565 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2567 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2568 order++, a_size <<= 1) ;
2569 resp = (char *) __get_free_pages(page_mask, order);
2570 while ((!resp) && order && retSzp) {
2572 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2573 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2577 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2578 memset(resp, 0, resSz);
2586 sg_page_free(char *buff, int size)
2592 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2593 order++, a_size <<= 1) ;
2594 free_pages((unsigned long) buff, order);
2598 sg_ms_to_jif(unsigned int msecs)
2600 if ((UINT_MAX / 2U) < msecs)
2601 return INT_MAX; /* special case, set largest possible */
2603 return ((int) msecs <
2604 (INT_MAX / 1000)) ? (((int) msecs * HZ) / 1000)
2605 : (((int) msecs / 1000) * HZ);
2608 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2609 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2610 MODE_SENSE, MODE_SENSE_10, LOG_SENSE
2614 sg_allow_access(unsigned char opcode, char dev_type)
2618 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2620 for (k = 0; k < sizeof (allow_ops); ++k) {
2621 if (opcode == allow_ops[k])
2627 #ifdef CONFIG_SCSI_PROC_FS
2632 unsigned long iflags;
2634 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2635 for (k = sg_dev_max - 1; k >= 0; --k)
2636 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2638 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2639 return k + 1; /* origin 1 */
2646 Sg_device *sdp = NULL;
2647 unsigned long iflags;
2649 if (sg_dev_arr && (dev >= 0)) {
2650 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2651 if (dev < sg_dev_max)
2652 sdp = sg_dev_arr[dev];
2653 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2658 #ifdef CONFIG_SCSI_PROC_FS
2660 static struct proc_dir_entry *sg_proc_sgp = NULL;
2662 static char sg_proc_sg_dirname[] = "scsi/sg";
2664 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2666 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2667 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2668 size_t count, loff_t *off);
2669 static struct file_operations adio_fops = {
2670 /* .owner, .read and .llseek added in sg_proc_init() */
2671 .open = sg_proc_single_open_adio,
2672 .write = sg_proc_write_adio,
2673 .release = single_release,
2676 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2677 static ssize_t sg_proc_write_dressz(struct file *filp,
2678 const char __user *buffer, size_t count, loff_t *off);
2679 static struct file_operations dressz_fops = {
2680 .open = sg_proc_single_open_dressz,
2681 .write = sg_proc_write_dressz,
2682 .release = single_release,
2685 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2686 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2687 static struct file_operations version_fops = {
2688 .open = sg_proc_single_open_version,
2689 .release = single_release,
2692 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2693 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2694 static struct file_operations devhdr_fops = {
2695 .open = sg_proc_single_open_devhdr,
2696 .release = single_release,
2699 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2700 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2701 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2702 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2703 static void dev_seq_stop(struct seq_file *s, void *v);
2704 static struct file_operations dev_fops = {
2705 .open = sg_proc_open_dev,
2706 .release = seq_release,
2708 static struct seq_operations dev_seq_ops = {
2709 .start = dev_seq_start,
2710 .next = dev_seq_next,
2711 .stop = dev_seq_stop,
2712 .show = sg_proc_seq_show_dev,
2715 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2716 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2717 static struct file_operations devstrs_fops = {
2718 .open = sg_proc_open_devstrs,
2719 .release = seq_release,
2721 static struct seq_operations devstrs_seq_ops = {
2722 .start = dev_seq_start,
2723 .next = dev_seq_next,
2724 .stop = dev_seq_stop,
2725 .show = sg_proc_seq_show_devstrs,
2728 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2729 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2730 static struct file_operations debug_fops = {
2731 .open = sg_proc_open_debug,
2732 .release = seq_release,
2734 static struct seq_operations debug_seq_ops = {
2735 .start = dev_seq_start,
2736 .next = dev_seq_next,
2737 .stop = dev_seq_stop,
2738 .show = sg_proc_seq_show_debug,
2742 struct sg_proc_leaf {
2744 struct file_operations * fops;
2747 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2748 {"allow_dio", &adio_fops},
2749 {"debug", &debug_fops},
2750 {"def_reserved_size", &dressz_fops},
2751 {"device_hdr", &devhdr_fops},
2752 {"devices", &dev_fops},
2753 {"device_strs", &devstrs_fops},
2754 {"version", &version_fops}
2762 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2763 struct proc_dir_entry *pdep;
2764 struct sg_proc_leaf * leaf;
2766 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
2767 S_IFDIR | S_IRUGO | S_IXUGO, NULL);
2770 for (k = 0; k < num_leaves; ++k) {
2771 leaf = &sg_proc_leaf_arr[k];
2772 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2773 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2775 leaf->fops->owner = THIS_MODULE,
2776 leaf->fops->read = seq_read,
2777 leaf->fops->llseek = seq_lseek,
2778 pdep->proc_fops = leaf->fops;
2785 sg_proc_cleanup(void)
2789 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2793 for (k = 0; k < num_leaves; ++k)
2794 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2795 remove_proc_entry(sg_proc_sg_dirname, NULL);
2799 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2801 seq_printf(s, "%d\n", *((int *)s->private));
2805 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2807 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2811 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2812 size_t count, loff_t *off)
2817 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2819 num = (count < 10) ? count : 10;
2820 if (copy_from_user(buff, buffer, num))
2823 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2827 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2829 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2833 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2834 size_t count, loff_t *off)
2837 unsigned long k = ULONG_MAX;
2840 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2842 num = (count < 10) ? count : 10;
2843 if (copy_from_user(buff, buffer, num))
2846 k = simple_strtoul(buff, NULL, 10);
2847 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2854 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2856 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2861 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2863 return single_open(file, sg_proc_seq_show_version, NULL);
2866 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2868 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2873 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2875 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2878 struct sg_proc_deviter {
2883 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2885 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2889 if (NULL == sg_dev_arr)
2892 it->max = sg_last_dev();
2893 if (it->index >= it->max)
2901 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2903 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2906 return (it->index < it->max) ? it : NULL;
2909 static void dev_seq_stop(struct seq_file *s, void *v)
2914 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2916 return seq_open(file, &dev_seq_ops);
2919 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2921 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2923 struct scsi_device *scsidp;
2925 sdp = it ? sg_get_dev(it->index) : NULL;
2926 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2927 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2928 scsidp->host->host_no, scsidp->channel,
2929 scsidp->id, scsidp->lun, (int) scsidp->type,
2931 (int) scsidp->queue_depth,
2932 (int) scsidp->device_busy,
2933 (int) scsi_device_online(scsidp));
2935 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2939 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2941 return seq_open(file, &devstrs_seq_ops);
2944 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2946 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2948 struct scsi_device *scsidp;
2950 sdp = it ? sg_get_dev(it->index) : NULL;
2951 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2952 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2953 scsidp->vendor, scsidp->model, scsidp->rev);
2955 seq_printf(s, "<no active device>\n");
2959 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2961 int k, m, new_interface, blen, usg;
2964 const sg_io_hdr_t *hp;
2967 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2968 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2969 "(res)sgat=%d low_dma=%d\n", k + 1,
2970 sg_jif_to_ms(fp->timeout),
2971 fp->reserve.bufflen,
2972 (int) fp->reserve.k_use_sg,
2974 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2975 (int) fp->cmd_q, (int) fp->force_packid,
2976 (int) fp->keep_orphan, (int) fp->closed);
2977 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2979 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2980 if (srp->res_used) {
2981 if (new_interface &&
2982 (SG_FLAG_MMAP_IO & hp->flags))
2987 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2993 blen = srp->my_cmdp ?
2994 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
2995 usg = srp->my_cmdp ?
2996 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
2997 seq_printf(s, srp->done ?
2998 ((1 == srp->done) ? "rcv:" : "fin:")
2999 : (srp->my_cmdp ? "act:" : "prior:"));
3000 seq_printf(s, " id=%d blen=%d",
3001 srp->header.pack_id, blen);
3003 seq_printf(s, " dur=%d", hp->duration);
3005 seq_printf(s, " t_o/elap=%d/%d",
3006 new_interface ? hp->timeout : sg_jif_to_ms(fp->timeout),
3007 sg_jif_to_ms(hp->duration ? (jiffies - hp->duration) : 0));
3008 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
3009 (int) srp->data.cmd_opcode);
3012 seq_printf(s, " No requests active\n");
3016 static int sg_proc_open_debug(struct inode *inode, struct file *file)
3018 return seq_open(file, &debug_seq_ops);
3021 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3023 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3026 if (it && (0 == it->index)) {
3027 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3028 "(origin 1)\n", sg_dev_max, (int)it->max);
3029 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3031 sdp = it ? sg_get_dev(it->index) : NULL;
3033 struct scsi_device *scsidp = sdp->device;
3035 if (NULL == scsidp) {
3036 seq_printf(s, "device %d detached ??\n",
3041 if (sg_get_nth_sfp(sdp, 0)) {
3042 seq_printf(s, " >>> device=%s ",
3043 sdp->disk->disk_name);
3045 seq_printf(s, "detached pending close ");
3048 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3049 scsidp->host->host_no,
3050 scsidp->channel, scsidp->id,
3052 scsidp->host->hostt->emulated);
3053 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3054 sdp->sg_tablesize, sdp->exclude);
3056 sg_proc_debug_helper(s, sdp);
3061 #endif /* CONFIG_SCSI_PROC_FS */
3063 module_init(init_sg);
3064 module_exit(exit_sg);
3065 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);