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/vmalloc.h>
46 #include <linux/smp_lock.h>
47 #include <linux/moduleparam.h>
48 #include <linux/devfs_fs_kernel.h>
49 #include <linux/cdev.h>
50 #include <linux/seq_file.h>
52 #include <linux/blkdev.h>
54 #include <scsi/scsi_host.h>
55 #include <scsi/scsi_driver.h>
56 #include <scsi/scsi_ioctl.h>
59 #include "scsi_logging.h"
61 #ifdef CONFIG_SCSI_PROC_FS
62 #include <linux/proc_fs.h>
63 static char *sg_version_date = "20040513";
65 static int sg_proc_init(void);
66 static void sg_proc_cleanup(void);
69 #ifndef LINUX_VERSION_CODE
70 #include <linux/version.h>
71 #endif /* LINUX_VERSION_CODE */
73 #define SG_ALLOW_DIO_DEF 0
74 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
76 #define SG_MAX_DEVS 8192
79 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
80 * Then when using 32 bit integers x * m may overflow during the calculation.
81 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
82 * calculates the same, but prevents the overflow when both m and d
83 * are "small" numbers (like HZ and USER_HZ).
84 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
87 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
89 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
91 int sg_big_buff = SG_DEF_RESERVED_SIZE;
92 /* N.B. This variable is readable and writeable via
93 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
94 of this size (or less if there is not enough memory) will be reserved
95 for use by this file descriptor. [Deprecated usage: this variable is also
96 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
97 the kernel (i.e. it is not a module).] */
98 static int def_reserved_size = -1; /* picks up init parameter */
99 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
101 #define SG_SECTOR_SZ 512
102 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
104 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
106 static int sg_add(struct class_device *);
107 static void sg_remove(struct class_device *);
109 static Scsi_Request *dummy_cmdp; /* only used for sizeof */
111 static rwlock_t sg_dev_arr_lock = RW_LOCK_UNLOCKED; /* Also used to lock
112 file descriptor list for device */
114 static struct class_interface sg_interface = {
119 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
120 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
121 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
122 unsigned bufflen; /* Size of (aggregate) data buffer */
123 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
124 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
125 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
126 unsigned char cmd_opcode; /* first byte of command */
129 struct sg_device; /* forward declarations */
132 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
133 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
134 struct sg_request *nextrp; /* NULL -> tail request (slist) */
135 struct sg_fd *parentfp; /* NULL -> not in use */
136 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
137 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
138 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
139 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
140 char orphan; /* 1 -> drop on sight, 0 -> normal */
141 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
142 volatile char done; /* 0->before bh, 1->before read, 2->read */
145 typedef struct sg_fd { /* holds the state of a file descriptor */
146 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
147 struct sg_device *parentdp; /* owning device */
148 wait_queue_head_t read_wait; /* queue read until command done */
149 rwlock_t rq_list_lock; /* protect access to list in req_arr */
150 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
151 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
152 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
153 unsigned save_scat_len; /* original length of trunc. scat. element */
154 Sg_request *headrp; /* head of request slist, NULL->empty */
155 struct fasync_struct *async_qp; /* used by asynchronous notification */
156 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
157 char low_dma; /* as in parent but possibly overridden to 1 */
158 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
159 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
160 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
161 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
162 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
163 char mmap_called; /* 0 -> mmap() never called on this fd */
166 typedef struct sg_device { /* holds the state of each scsi generic device */
167 struct scsi_device *device;
168 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
169 int sg_tablesize; /* adapter's max scatter-gather table size */
170 Sg_fd *headfp; /* first open fd belonging to this device */
171 volatile char detached; /* 0->attached, 1->detached pending removal */
172 volatile char exclude; /* opened for exclusive access */
173 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 struct gendisk *disk;
175 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
178 static int sg_fasync(int fd, struct file *filp, int mode);
179 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
180 static int sg_start_req(Sg_request * srp);
181 static void sg_finish_rem_req(Sg_request * srp);
182 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
183 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
185 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
187 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
188 int blocking, int read_only, Sg_request ** o_srp);
189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
191 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
192 int wr_xf, int *countp, unsigned char __user **up);
193 static int sg_write_xfer(Sg_request * srp);
194 static int sg_read_xfer(Sg_request * srp);
195 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
196 static void sg_remove_scat(Sg_scatter_hold * schp);
197 static void sg_build_reserve(Sg_fd * sfp, int req_size);
198 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
199 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
200 static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
201 static void sg_page_free(char *buff, int size);
202 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
203 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
204 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
205 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
206 static Sg_request *sg_add_request(Sg_fd * sfp);
207 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
208 static int sg_res_in_use(Sg_fd * sfp);
209 static int sg_ms_to_jif(unsigned int msecs);
210 static inline unsigned sg_jif_to_ms(int jifs);
211 static int sg_allow_access(unsigned char opcode, char dev_type);
212 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
213 static Sg_device *sg_get_dev(int dev);
214 static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
215 #ifdef CONFIG_SCSI_PROC_FS
216 static int sg_last_dev(void);
219 static Sg_device **sg_dev_arr = NULL;
220 static int sg_dev_max;
221 static int sg_nr_dev;
223 #define SZ_SG_HEADER sizeof(struct sg_header)
224 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
225 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
226 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
229 sg_open(struct inode *inode, struct file *filp)
231 int dev = iminor(inode);
232 int flags = filp->f_flags;
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 /* scsi generic is only for non-disk, non-cd, non-tape devices */
246 if ( (sdp->device->type == TYPE_DISK) || (sdp->device->type == TYPE_MOD) || (sdp->device->type == TYPE_ROM)
247 || (sdp->device->type == TYPE_WORM) || ( sdp->device->type == TYPE_TAPE))
248 printk(KERN_WARNING "%s: Using deprecated /dev/sg mechanism instead of SG_IO on the actual device\n",current->comm);
251 /* This driver's module count bumped by fops_get in <linux/fs.h> */
252 /* Prevent the device driver from vanishing while we sleep */
253 retval = scsi_device_get(sdp->device);
257 if (!((flags & O_NONBLOCK) ||
258 scsi_block_when_processing_errors(sdp->device))) {
260 /* we are in error recovery for this device */
264 if (flags & O_EXCL) {
265 if (O_RDONLY == (flags & O_ACCMODE)) {
266 retval = -EPERM; /* Can't lock it with read only access */
269 if (sdp->headfp && (flags & O_NONBLOCK)) {
274 __wait_event_interruptible(sdp->o_excl_wait,
275 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
277 retval = res; /* -ERESTARTSYS because signal hit process */
280 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
281 if (flags & O_NONBLOCK) {
286 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
289 retval = res; /* -ERESTARTSYS because signal hit process */
297 if (!sdp->headfp) { /* no existing opens on this device */
299 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
301 if ((sfp = sg_add_sfp(sdp, dev)))
302 filp->private_data = sfp;
305 sdp->exclude = 0; /* undo if error */
312 scsi_device_put(sdp->device);
316 /* Following function was formerly called 'sg_close' */
318 sg_release(struct inode *inode, struct file *filp)
323 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
325 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
326 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
327 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
328 if (!sdp->detached) {
329 scsi_device_put(sdp->device);
332 wake_up_interruptible(&sdp->o_excl_wait);
338 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
344 int req_pack_id = -1;
345 struct sg_header old_hdr;
349 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
351 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
352 sdp->disk->disk_name, (int) count));
353 if (ppos != &filp->f_pos) ; /* FIXME: Hmm. Seek to the right place, or fail? */
354 if ((k = verify_area(VERIFY_WRITE, buf, count)))
356 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
357 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
359 if (old_hdr.reply_len < 0) {
360 if (count >= SZ_SG_IO_HDR) {
362 (&new_hdr, buf, SZ_SG_IO_HDR))
364 req_pack_id = new_hdr.pack_id;
367 req_pack_id = old_hdr.pack_id;
369 srp = sg_get_rq_mark(sfp, req_pack_id);
370 if (!srp) { /* now wait on packet to arrive */
373 if (filp->f_flags & O_NONBLOCK)
376 res = 0; /* following is a macro that beats race condition */
377 __wait_event_interruptible(sfp->read_wait,
378 (sdp->detached || (srp = sg_get_rq_mark(sfp, req_pack_id))),
384 return res; /* -ERESTARTSYS because signal hit process */
387 if (srp->header.interface_id != '\0')
388 return sg_new_read(sfp, buf, count, srp);
391 memset(&old_hdr, 0, SZ_SG_HEADER);
392 old_hdr.reply_len = (int) hp->timeout;
393 old_hdr.pack_len = old_hdr.reply_len; /* very old, strange behaviour */
394 old_hdr.pack_id = hp->pack_id;
395 old_hdr.twelve_byte =
396 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
397 old_hdr.target_status = hp->masked_status;
398 old_hdr.host_status = hp->host_status;
399 old_hdr.driver_status = hp->driver_status;
400 if ((CHECK_CONDITION & hp->masked_status) ||
401 (DRIVER_SENSE & hp->driver_status))
402 memcpy(old_hdr.sense_buffer, srp->sense_b,
403 sizeof (old_hdr.sense_buffer));
404 switch (hp->host_status) {
405 /* This setup of 'result' is for backward compatibility and is best
406 ignored by the user who should use target, host + driver status */
408 case DID_PASSTHROUGH:
415 old_hdr.result = EBUSY;
422 old_hdr.result = EIO;
425 old_hdr.result = (srp->sense_b[0] == 0 &&
426 hp->masked_status == GOOD) ? 0 : EIO;
429 old_hdr.result = EIO;
433 /* Now copy the result back to the user buffer. */
434 if (count >= SZ_SG_HEADER) {
435 if (__copy_to_user(buf, &old_hdr, SZ_SG_HEADER))
438 if (count > old_hdr.reply_len)
439 count = old_hdr.reply_len;
440 if (count > SZ_SG_HEADER) {
442 sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)))
446 count = (old_hdr.result == 0) ? 0 : -EIO;
447 sg_finish_rem_req(srp);
452 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
454 sg_io_hdr_t *hp = &srp->header;
458 if (count < SZ_SG_IO_HDR) {
463 if ((hp->mx_sb_len > 0) && hp->sbp) {
464 if ((CHECK_CONDITION & hp->masked_status) ||
465 (DRIVER_SENSE & hp->driver_status)) {
466 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
467 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
468 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
469 len = (len > sb_len) ? sb_len : len;
470 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
477 if (hp->masked_status || hp->host_status || hp->driver_status)
478 hp->info |= SG_INFO_CHECK;
479 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
483 err = sg_read_xfer(srp);
485 sg_finish_rem_req(srp);
486 return (0 == err) ? count : err;
490 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
492 int mxsize, cmd_size, k;
493 int input_size, blocking;
494 unsigned char opcode;
498 struct sg_header old_hdr;
500 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
502 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
504 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
505 sdp->disk->disk_name, (int) count));
508 if (!((filp->f_flags & O_NONBLOCK) ||
509 scsi_block_when_processing_errors(sdp->device)))
511 if (ppos != &filp->f_pos) ; /* FIXME: Hmm. Seek to the right place, or fail? */
513 if ((k = verify_area(VERIFY_READ, buf, count)))
514 return k; /* protects following copy_from_user()s + get_user()s */
515 if (count < SZ_SG_HEADER)
517 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
519 blocking = !(filp->f_flags & O_NONBLOCK);
520 if (old_hdr.reply_len < 0)
521 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
522 if (count < (SZ_SG_HEADER + 6))
523 return -EIO; /* The minimum scsi command length is 6 bytes. */
525 if (!(srp = sg_add_request(sfp))) {
526 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
530 __get_user(opcode, buf);
531 if (sfp->next_cmd_len > 0) {
532 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
533 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
534 sfp->next_cmd_len = 0;
535 sg_remove_request(sfp, srp);
538 cmd_size = sfp->next_cmd_len;
539 sfp->next_cmd_len = 0; /* reset so only this write() effected */
541 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
542 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
545 SCSI_LOG_TIMEOUT(4, printk(
546 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
547 /* Determine buffer size. */
548 input_size = count - cmd_size;
549 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
550 mxsize -= SZ_SG_HEADER;
551 input_size -= SZ_SG_HEADER;
552 if (input_size < 0) {
553 sg_remove_request(sfp, srp);
554 return -EIO; /* User did not pass enough bytes for this command. */
557 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
558 hp->cmd_len = (unsigned char) cmd_size;
562 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
563 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
565 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
566 hp->dxfer_len = mxsize;
567 hp->dxferp = (char __user *)buf + cmd_size;
569 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
570 hp->flags = input_size; /* structure abuse ... */
571 hp->pack_id = old_hdr.pack_id;
573 if (__copy_from_user(cmnd, buf, cmd_size))
575 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
576 return (k < 0) ? k : count;
580 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
581 int blocking, int read_only, Sg_request ** o_srp)
586 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
589 if (count < SZ_SG_IO_HDR)
591 if ((k = verify_area(VERIFY_READ, buf, count)))
592 return k; /* protects following copy_from_user()s + get_user()s */
594 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
595 if (!(srp = sg_add_request(sfp))) {
596 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
600 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
601 sg_remove_request(sfp, srp);
604 if (hp->interface_id != 'S') {
605 sg_remove_request(sfp, srp);
608 if (hp->flags & SG_FLAG_MMAP_IO) {
609 if (hp->dxfer_len > sfp->reserve.bufflen) {
610 sg_remove_request(sfp, srp);
611 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
613 if (hp->flags & SG_FLAG_DIRECT_IO) {
614 sg_remove_request(sfp, srp);
615 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
617 if (sg_res_in_use(sfp)) {
618 sg_remove_request(sfp, srp);
619 return -EBUSY; /* reserve buffer already being used */
622 timeout = sg_ms_to_jif(srp->header.timeout);
623 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
624 sg_remove_request(sfp, srp);
627 if ((k = verify_area(VERIFY_READ, hp->cmdp, hp->cmd_len))) {
628 sg_remove_request(sfp, srp);
629 return k; /* protects following copy_from_user()s + get_user()s */
631 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
632 sg_remove_request(sfp, srp);
636 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
637 sg_remove_request(sfp, srp);
640 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
649 sg_common_write(Sg_fd * sfp, Sg_request * srp,
650 unsigned char *cmnd, int timeout, int blocking)
654 Sg_device *sdp = sfp->parentdp;
655 sg_io_hdr_t *hp = &srp->header;
658 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
660 hp->masked_status = 0;
664 hp->driver_status = 0;
666 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
667 (int) cmnd[0], (int) hp->cmd_len));
669 if ((k = sg_start_req(srp))) {
670 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
671 sg_finish_rem_req(srp);
672 return k; /* probably out of space --> ENOMEM */
674 if ((k = sg_write_xfer(srp))) {
675 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
676 sg_finish_rem_req(srp);
680 sg_finish_rem_req(srp);
683 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
685 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
686 sg_finish_rem_req(srp);
690 srp->my_cmdp = SRpnt;
691 q = SRpnt->sr_device->request_queue;
692 SRpnt->sr_request->rq_disk = sdp->disk;
693 SRpnt->sr_sense_buffer[0] = 0;
694 SRpnt->sr_cmd_len = hp->cmd_len;
695 SRpnt->sr_use_sg = srp->data.k_use_sg;
696 SRpnt->sr_sglist_len = srp->data.sglist_len;
697 SRpnt->sr_bufflen = srp->data.bufflen;
698 SRpnt->sr_underflow = 0;
699 SRpnt->sr_buffer = srp->data.buffer;
700 switch (hp->dxfer_direction) {
701 case SG_DXFER_TO_FROM_DEV:
702 case SG_DXFER_FROM_DEV:
703 SRpnt->sr_data_direction = SCSI_DATA_READ;
705 case SG_DXFER_TO_DEV:
706 SRpnt->sr_data_direction = SCSI_DATA_WRITE;
708 case SG_DXFER_UNKNOWN:
709 SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN;
712 SRpnt->sr_data_direction = SCSI_DATA_NONE;
715 SRpnt->upper_private_data = srp;
716 srp->data.k_use_sg = 0;
717 srp->data.sglist_len = 0;
718 srp->data.bufflen = 0;
719 srp->data.buffer = NULL;
720 hp->duration = jiffies; /* unit jiffies now, millisecs after done */
721 /* Now send everything of to mid-level. The next time we hear about this
722 packet is when sg_cmd_done() is called (i.e. a callback). */
723 scsi_do_req(SRpnt, (void *) cmnd,
724 (void *) SRpnt->sr_buffer, hp->dxfer_len,
725 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
726 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
727 generic_unplug_device(q);
732 sg_ioctl(struct inode *inode, struct file *filp,
733 unsigned int cmd_in, unsigned long arg)
735 void __user *p = (void __user *)arg;
737 int result, val, read_only;
741 unsigned long iflags;
743 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
745 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
746 sdp->disk->disk_name, (int) cmd_in));
747 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
752 int blocking = 1; /* ignore O_NONBLOCK flag */
756 if (!scsi_block_when_processing_errors(sdp->device))
758 result = verify_area(VERIFY_WRITE, p, SZ_SG_IO_HDR);
762 sg_new_write(sfp, p, SZ_SG_IO_HDR,
763 blocking, read_only, &srp);
766 srp->sg_io_owned = 1;
768 result = 0; /* following macro to beat race condition */
769 __wait_event_interruptible(sfp->read_wait,
770 (sdp->detached || sfp->closed || srp->done),
775 return 0; /* request packet dropped already */
779 return result; /* -ERESTARTSYS because signal hit process */
782 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
783 return (result < 0) ? result : 0;
786 result = get_user(val, ip);
791 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
792 val = MULDIV (INT_MAX, USER_HZ, HZ);
793 sfp->timeout_user = val;
794 sfp->timeout = MULDIV (val, HZ, USER_HZ);
797 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
798 /* strange ..., for backward compatibility */
799 return sfp->timeout_user;
800 case SG_SET_FORCE_LOW_DMA:
801 result = get_user(val, ip);
806 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
807 val = (int) sfp->reserve.bufflen;
808 sg_remove_scat(&sfp->reserve);
809 sg_build_reserve(sfp, val);
814 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
818 return put_user((int) sfp->low_dma, ip);
821 verify_area(VERIFY_WRITE, p, sizeof (sg_scsi_id_t));
825 sg_scsi_id_t __user *sg_idp = p;
829 __put_user((int) sdp->device->host->host_no,
831 __put_user((int) sdp->device->channel,
833 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
834 __put_user((int) sdp->device->lun, &sg_idp->lun);
835 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
836 __put_user((short) sdp->device->host->cmd_per_lun,
837 &sg_idp->h_cmd_per_lun);
838 __put_user((short) sdp->device->queue_depth,
839 &sg_idp->d_queue_depth);
840 __put_user(0, &sg_idp->unused[0]);
841 __put_user(0, &sg_idp->unused[1]);
844 case SG_SET_FORCE_PACK_ID:
845 result = get_user(val, ip);
848 sfp->force_packid = val ? 1 : 0;
851 result = verify_area(VERIFY_WRITE, ip, sizeof (int));
854 read_lock_irqsave(&sfp->rq_list_lock, iflags);
855 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
856 if ((1 == srp->done) && (!srp->sg_io_owned)) {
857 read_unlock_irqrestore(&sfp->rq_list_lock,
859 __put_user(srp->header.pack_id, ip);
863 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
866 case SG_GET_NUM_WAITING:
867 read_lock_irqsave(&sfp->rq_list_lock, iflags);
868 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
869 if ((1 == srp->done) && (!srp->sg_io_owned))
872 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
873 return put_user(val, ip);
874 case SG_GET_SG_TABLESIZE:
875 return put_user(sdp->sg_tablesize, ip);
876 case SG_SET_RESERVED_SIZE:
877 result = get_user(val, ip);
882 if (val != sfp->reserve.bufflen) {
883 if (sg_res_in_use(sfp) || sfp->mmap_called)
885 sg_remove_scat(&sfp->reserve);
886 sg_build_reserve(sfp, val);
889 case SG_GET_RESERVED_SIZE:
890 val = (int) sfp->reserve.bufflen;
891 return put_user(val, ip);
892 case SG_SET_COMMAND_Q:
893 result = get_user(val, ip);
896 sfp->cmd_q = val ? 1 : 0;
898 case SG_GET_COMMAND_Q:
899 return put_user((int) sfp->cmd_q, ip);
900 case SG_SET_KEEP_ORPHAN:
901 result = get_user(val, ip);
904 sfp->keep_orphan = val;
906 case SG_GET_KEEP_ORPHAN:
907 return put_user((int) sfp->keep_orphan, ip);
908 case SG_NEXT_CMD_LEN:
909 result = get_user(val, ip);
912 sfp->next_cmd_len = (val > 0) ? val : 0;
914 case SG_GET_VERSION_NUM:
915 return put_user(sg_version_num, ip);
916 case SG_GET_ACCESS_COUNT:
917 /* faked - we don't have a real access count anymore */
918 val = (sdp->device ? 1 : 0);
919 return put_user(val, ip);
920 case SG_GET_REQUEST_TABLE:
921 result = verify_area(VERIFY_WRITE, p,
922 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
926 sg_req_info_t rinfo[SG_MAX_QUEUE];
928 read_lock_irqsave(&sfp->rq_list_lock, iflags);
929 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
930 ++val, srp = srp ? srp->nextrp : srp) {
931 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
933 rinfo[val].req_state = srp->done + 1;
935 srp->header.masked_status &
936 srp->header.host_status &
937 srp->header.driver_status;
938 rinfo[val].duration =
939 srp->done ? srp->header.duration :
941 jiffies - srp->header.duration);
942 rinfo[val].orphan = srp->orphan;
943 rinfo[val].sg_io_owned = srp->sg_io_owned;
944 rinfo[val].pack_id = srp->header.pack_id;
945 rinfo[val].usr_ptr = srp->header.usr_ptr;
948 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
949 return (__copy_to_user(p, rinfo,
950 SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0);
952 case SG_EMULATED_HOST:
955 return put_user(sdp->device->host->hostt->emulated, ip);
959 if (filp->f_flags & O_NONBLOCK) {
960 if (test_bit(SHOST_RECOVERY,
961 &sdp->device->host->shost_state))
963 } else if (!scsi_block_when_processing_errors(sdp->device))
965 result = get_user(val, ip);
968 if (SG_SCSI_RESET_NOTHING == val)
971 case SG_SCSI_RESET_DEVICE:
972 val = SCSI_TRY_RESET_DEVICE;
974 case SG_SCSI_RESET_BUS:
975 val = SCSI_TRY_RESET_BUS;
977 case SG_SCSI_RESET_HOST:
978 val = SCSI_TRY_RESET_HOST;
983 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
985 return (scsi_reset_provider(sdp->device, val) ==
987 case SCSI_IOCTL_SEND_COMMAND:
991 unsigned char opcode = WRITE_6;
992 Scsi_Ioctl_Command __user *siocp = p;
994 if (copy_from_user(&opcode, siocp->data, 1))
996 if (!sg_allow_access(opcode, sdp->device->type))
999 return scsi_ioctl_send_command(sdp->device, p);
1001 result = get_user(val, ip);
1004 sdp->sgdebug = (char) val;
1006 case SCSI_IOCTL_GET_IDLUN:
1007 case SCSI_IOCTL_GET_BUS_NUMBER:
1008 case SCSI_IOCTL_PROBE_HOST:
1009 case SG_GET_TRANSFORM:
1012 return scsi_ioctl(sdp->device, cmd_in, p);
1015 return -EPERM; /* don't know so take safe approach */
1016 return scsi_ioctl(sdp->device, cmd_in, p);
1021 sg_poll(struct file *filp, poll_table * wait)
1023 unsigned int res = 0;
1028 unsigned long iflags;
1030 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1033 poll_wait(filp, &sfp->read_wait, wait);
1034 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1035 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1036 /* if any read waiting, flag it */
1037 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1038 res = POLLIN | POLLRDNORM;
1041 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1045 else if (!sfp->cmd_q) {
1047 res |= POLLOUT | POLLWRNORM;
1048 } else if (count < SG_MAX_QUEUE)
1049 res |= POLLOUT | POLLWRNORM;
1050 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1051 sdp->disk->disk_name, (int) res));
1056 sg_fasync(int fd, struct file *filp, int mode)
1062 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1064 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1065 sdp->disk->disk_name, mode));
1067 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1068 return (retval < 0) ? retval : 0;
1071 static inline unsigned char *
1072 sg_scatg2virt(const struct scatterlist *sclp)
1074 return (sclp && sclp->page) ?
1075 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1078 /* When startFinish==1 increments page counts for pages other than the
1079 first of scatter gather elements obtained from __get_free_pages().
1080 When startFinish==0 decrements ... */
1082 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1088 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1089 startFinish, rsv_schp->k_use_sg));
1090 /* N.B. correction _not_ applied to base page of each allocation */
1091 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1092 struct scatterlist *sclp = rsv_schp->buffer;
1094 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1095 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1096 page_ptr = sg_scatg2virt(sclp) + m;
1097 page = virt_to_page(page_ptr);
1101 if (page_count(page) > 0)
1106 } else { /* reserve buffer is just a single allocation */
1107 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1108 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1109 page = virt_to_page(page_ptr);
1113 if (page_count(page) > 0)
1120 static struct page *
1121 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1124 struct page *page = NOPAGE_SIGBUS;
1125 void *page_ptr = NULL;
1126 unsigned long offset;
1127 Sg_scatter_hold *rsv_schp;
1129 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1131 rsv_schp = &sfp->reserve;
1132 offset = addr - vma->vm_start;
1133 if (offset >= rsv_schp->bufflen)
1135 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1136 offset, rsv_schp->k_use_sg));
1137 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1139 unsigned long sa = vma->vm_start;
1141 struct scatterlist *sclp = rsv_schp->buffer;
1143 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1145 len = vma->vm_end - sa;
1146 len = (len < sclp->length) ? len : sclp->length;
1148 page_ptr = sg_scatg2virt(sclp) + offset;
1149 page = virt_to_page(page_ptr);
1150 get_page(page); /* increment page count */
1156 } else { /* reserve buffer is just a single allocation */
1157 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1158 page = virt_to_page(page_ptr);
1159 get_page(page); /* increment page count */
1162 *type = VM_FAULT_MINOR;
1166 static struct vm_operations_struct sg_mmap_vm_ops = {
1167 .nopage = sg_vma_nopage,
1171 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1174 unsigned long req_sz = vma->vm_end - vma->vm_start;
1175 Sg_scatter_hold *rsv_schp;
1177 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1179 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1180 (void *) vma->vm_start, (int) req_sz));
1182 return -EINVAL; /* want no offset */
1183 rsv_schp = &sfp->reserve;
1184 if (req_sz > rsv_schp->bufflen)
1185 return -ENOMEM; /* cannot map more than reserved buffer */
1187 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1189 unsigned long sa = vma->vm_start;
1191 struct scatterlist *sclp = rsv_schp->buffer;
1193 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1195 if (0 != sclp->offset)
1196 return -EFAULT; /* non page aligned memory ?? */
1197 len = vma->vm_end - sa;
1198 len = (len < sclp->length) ? len : sclp->length;
1201 } else { /* reserve buffer is just a single allocation */
1202 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1203 return -EFAULT; /* non page aligned memory ?? */
1205 if (0 == sfp->mmap_called) {
1206 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1207 sfp->mmap_called = 1;
1209 vma->vm_flags |= (VM_RESERVED | VM_IO);
1210 vma->vm_private_data = sfp;
1211 vma->vm_ops = &sg_mmap_vm_ops;
1215 /* This function is a "bottom half" handler that is called by the
1216 * mid level when a command is completed (or has failed). */
1218 sg_cmd_done(Scsi_Cmnd * SCpnt)
1220 Scsi_Request *SRpnt = NULL;
1221 Sg_device *sdp = NULL;
1223 Sg_request *srp = NULL;
1225 if (SCpnt && (SRpnt = SCpnt->sc_request))
1226 srp = (Sg_request *) SRpnt->upper_private_data;
1228 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1230 scsi_release_request(SRpnt);
1233 sfp = srp->parentfp;
1235 sdp = sfp->parentdp;
1236 if ((NULL == sdp) || sdp->detached) {
1237 printk(KERN_INFO "sg_cmd_done: device detached\n");
1238 scsi_release_request(SRpnt);
1242 /* First transfer ownership of data buffers to sg_device object. */
1243 srp->data.k_use_sg = SRpnt->sr_use_sg;
1244 srp->data.sglist_len = SRpnt->sr_sglist_len;
1245 srp->data.bufflen = SRpnt->sr_bufflen;
1246 srp->data.buffer = SRpnt->sr_buffer;
1247 /* now clear out request structure */
1248 SRpnt->sr_use_sg = 0;
1249 SRpnt->sr_sglist_len = 0;
1250 SRpnt->sr_bufflen = 0;
1251 SRpnt->sr_buffer = NULL;
1252 SRpnt->sr_underflow = 0;
1253 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1255 srp->my_cmdp = NULL;
1257 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1258 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1259 srp->header.resid = SCpnt->resid;
1260 /* N.B. unit of duration changes here from jiffies to millisecs */
1261 srp->header.duration =
1262 sg_jif_to_ms(jiffies - (int) srp->header.duration);
1263 if (0 != SRpnt->sr_result) {
1264 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1265 sizeof (srp->sense_b));
1266 srp->header.status = 0xff & SRpnt->sr_result;
1267 srp->header.masked_status = status_byte(SRpnt->sr_result);
1268 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1269 srp->header.host_status = host_byte(SRpnt->sr_result);
1270 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1271 if ((sdp->sgdebug > 0) &&
1272 ((CHECK_CONDITION == srp->header.masked_status) ||
1273 (COMMAND_TERMINATED == srp->header.masked_status)))
1274 print_req_sense("sg_cmd_done", SRpnt);
1276 /* Following if statement is a patch supplied by Eric Youngdale */
1277 if (driver_byte(SRpnt->sr_result) != 0
1278 && (SRpnt->sr_sense_buffer[0] & 0x7f) == 0x70
1279 && (SRpnt->sr_sense_buffer[2] & 0xf) == UNIT_ATTENTION
1280 && sdp->device->removable) {
1281 /* Detected disc change. Set the bit - this may be used if */
1282 /* there are filesystems using this device. */
1283 sdp->device->changed = 1;
1286 /* Rely on write phase to clean out srp status values, so no "else" */
1288 scsi_release_request(SRpnt);
1290 if (sfp->closed) { /* whoops this fd already released, cleanup */
1291 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1292 sg_finish_rem_req(srp);
1294 if (NULL == sfp->headrp) {
1295 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1296 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1297 scsi_device_put(sdp->device);
1301 } else if (srp && srp->orphan) {
1302 if (sfp->keep_orphan)
1303 srp->sg_io_owned = 0;
1305 sg_finish_rem_req(srp);
1310 /* Now wake up any sg_read() that is waiting for this packet. */
1311 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1313 wake_up_interruptible(&sfp->read_wait);
1317 static struct file_operations sg_fops = {
1318 .owner = THIS_MODULE,
1325 .release = sg_release,
1326 .fasync = sg_fasync,
1329 static struct class_simple * sg_sysfs_class;
1331 static int sg_sysfs_valid = 0;
1333 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1336 unsigned long iflags;
1337 void *old_sg_dev_arr = NULL;
1340 sdp = vmalloc(sizeof(Sg_device));
1344 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1345 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1347 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1348 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1350 tmp_da = vmalloc(tmp_dev_max * sizeof(Sg_device *));
1351 if (unlikely(!tmp_da))
1354 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1355 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1356 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1357 old_sg_dev_arr = sg_dev_arr;
1358 sg_dev_arr = tmp_da;
1359 sg_dev_max = tmp_dev_max;
1362 for (k = 0; k < sg_dev_max; k++)
1365 if (unlikely(k >= SG_MAX_DEVS))
1368 memset(sdp, 0, sizeof(*sdp));
1369 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1370 sprintf(disk->disk_name, "sg%d", k);
1371 disk->first_minor = k;
1373 sdp->device = scsidp;
1374 init_waitqueue_head(&sdp->o_excl_wait);
1375 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1378 sg_dev_arr[k] = sdp;
1379 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1385 vfree(old_sg_dev_arr);
1389 printk(KERN_ERR "sg_alloc: device array cannot be resized\n");
1394 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1396 "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
1397 "number exceeds %d\n", scsidp->host->host_no, scsidp->channel,
1398 scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
1404 sg_add(struct class_device *cl_dev)
1406 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1407 struct gendisk *disk;
1408 Sg_device *sdp = NULL;
1409 struct cdev * cdev = NULL;
1412 disk = alloc_disk(1);
1415 disk->major = SCSI_GENERIC_MAJOR;
1418 cdev = cdev_alloc();
1421 cdev->owner = THIS_MODULE;
1422 cdev->ops = &sg_fops;
1424 error = sg_alloc(disk, scsidp);
1428 sdp = sg_dev_arr[k];
1430 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1431 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1432 "%s/generic", scsidp->devfs_name);
1433 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1435 devfs_remove("%s/generic", scsidp->devfs_name);
1439 if (sg_sysfs_valid) {
1440 struct class_device * sg_class_member;
1442 sg_class_member = class_simple_device_add(sg_sysfs_class,
1443 MKDEV(SCSI_GENERIC_MAJOR, k),
1446 if (IS_ERR(sg_class_member))
1447 printk(KERN_WARNING "sg_add: "
1448 "class_simple_device_add failed\n");
1449 class_set_devdata(sg_class_member, sdp);
1450 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1451 &sg_class_member->kobj, "generic");
1453 printk(KERN_ERR "sg_add: unable to make symlink "
1454 "'generic' back to sg%d\n", k);
1456 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1459 "Attached scsi generic sg%d at scsi%d, channel"
1460 " %d, id %d, lun %d, type %d\n", k,
1461 scsidp->host->host_no, scsidp->channel, scsidp->id,
1462 scsidp->lun, scsidp->type);
1474 sg_remove(struct class_device *cl_dev)
1476 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1477 Sg_device *sdp = NULL;
1478 unsigned long iflags;
1485 if (NULL == sg_dev_arr)
1488 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1489 for (k = 0; k < sg_dev_max; k++) {
1490 sdp = sg_dev_arr[k];
1491 if ((NULL == sdp) || (sdp->device != scsidp))
1492 continue; /* dirty but lowers nesting */
1495 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1497 for (srp = sfp->headrp; srp; srp = tsrp) {
1499 if (sfp->closed || (0 == srp->done))
1500 sg_finish_rem_req(srp);
1503 scsi_device_put(sdp->device);
1504 __sg_remove_sfp(sdp, sfp);
1507 wake_up_interruptible(&sfp->read_wait);
1508 kill_fasync(&sfp->async_qp, SIGPOLL,
1512 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1513 if (NULL == sdp->headfp) {
1514 sg_dev_arr[k] = NULL;
1516 } else { /* nothing active, simple case */
1517 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1518 sg_dev_arr[k] = NULL;
1523 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1526 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1527 class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k));
1528 cdev_del(sdp->cdev);
1530 devfs_remove("%s/generic", scsidp->devfs_name);
1531 put_disk(sdp->disk);
1533 if (NULL == sdp->headfp)
1534 vfree((char *) sdp);
1538 scsi_sleep(2); /* dirty detach so delay device destruction */
1541 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1542 * of sysfs parameters (which module_param doesn't yet support).
1543 * Sysfs parameters defined explicitly below.
1545 module_param_named(def_reserved_size, def_reserved_size, int, 0);
1546 module_param_named(allow_dio, sg_allow_dio, int, 0);
1548 MODULE_AUTHOR("Douglas Gilbert");
1549 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1550 MODULE_LICENSE("GPL");
1551 MODULE_VERSION(SG_VERSION_STR);
1553 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1554 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1561 if (def_reserved_size >= 0)
1562 sg_big_buff = def_reserved_size;
1564 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1568 sg_sysfs_class = class_simple_create(THIS_MODULE, "scsi_generic");
1569 if ( IS_ERR(sg_sysfs_class) ) {
1570 rc = PTR_ERR(sg_sysfs_class);
1574 rc = scsi_register_interface(&sg_interface);
1576 #ifdef CONFIG_SCSI_PROC_FS
1578 #endif /* CONFIG_SCSI_PROC_FS */
1581 class_simple_destroy(sg_sysfs_class);
1583 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1590 #ifdef CONFIG_SCSI_PROC_FS
1592 #endif /* CONFIG_SCSI_PROC_FS */
1593 scsi_unregister_interface(&sg_interface);
1594 class_simple_destroy(sg_sysfs_class);
1596 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1598 if (sg_dev_arr != NULL) {
1599 vfree((char *) sg_dev_arr);
1606 sg_start_req(Sg_request * srp)
1609 Sg_fd *sfp = srp->parentfp;
1610 sg_io_hdr_t *hp = &srp->header;
1611 int dxfer_len = (int) hp->dxfer_len;
1612 int dxfer_dir = hp->dxfer_direction;
1613 Sg_scatter_hold *req_schp = &srp->data;
1614 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1616 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1617 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1619 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1620 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1621 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1622 res = sg_build_direct(srp, sfp, dxfer_len);
1623 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1626 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1627 sg_link_reserve(sfp, srp, dxfer_len);
1629 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1631 sg_remove_scat(req_schp);
1639 sg_finish_rem_req(Sg_request * srp)
1641 Sg_fd *sfp = srp->parentfp;
1642 Sg_scatter_hold *req_schp = &srp->data;
1644 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1646 sg_unlink_reserve(sfp, srp);
1648 sg_remove_scat(req_schp);
1649 sg_remove_request(sfp, srp);
1653 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1656 int elem_sz = sizeof (struct scatterlist);
1657 int sg_bufflen = tablesize * elem_sz;
1658 int mx_sc_elems = tablesize;
1660 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1663 else if (ret_sz != sg_bufflen) {
1664 sg_bufflen = ret_sz;
1665 mx_sc_elems = sg_bufflen / elem_sz;
1667 schp->sglist_len = sg_bufflen;
1668 memset(schp->buffer, 0, sg_bufflen);
1669 return mx_sc_elems; /* number of scat_gath elements allocated */
1672 #ifdef SG_ALLOW_DIO_CODE
1673 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1674 /* hopefully this generic code will moved to a library */
1676 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1677 - mapping of all pages not successful
1678 - any page is above max_pfn
1679 (i.e., either completely successful or fails)
1682 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1683 unsigned long uaddr, size_t count, int rw,
1684 unsigned long max_pfn)
1687 unsigned int nr_pages;
1688 struct page **pages;
1690 nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
1692 /* User attempted Overflow! */
1693 if ((uaddr + count) < uaddr)
1697 if (nr_pages > max_pages)
1704 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1707 /* Try to fault in all of the necessary pages */
1708 down_read(¤t->mm->mmap_sem);
1709 /* rw==READ means read from drive, write into memory area */
1710 res = get_user_pages(
1716 0, /* don't force */
1719 up_read(¤t->mm->mmap_sem);
1721 /* Errors and no page mapped should return here */
1725 for (i=0; i < nr_pages; i++) {
1726 /* FIXME: flush superflous for rw==READ,
1727 * probably wrong function for rw==WRITE
1729 flush_dcache_page(pages[i]);
1730 if (page_to_pfn(pages[i]) > max_pfn)
1732 /* ?? Is locking needed? I don't think so */
1733 /* if (TestSetPageLocked(pages[i]))
1737 /* Populate the scatter/gather list */
1738 sgl[0].page = pages[0];
1739 sgl[0].offset = uaddr & ~PAGE_MASK;
1741 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1742 count -= sgl[0].length;
1743 for (i=1; i < nr_pages ; i++) {
1745 sgl[i].page = pages[i];
1746 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1751 sgl[0].length = count;
1758 /* for (j=0; j < i; j++)
1759 unlock_page(pages[j]); */
1763 for (j=0; j < res; j++)
1764 page_cache_release(pages[j]);
1770 /* And unmap them... */
1772 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1777 for (i=0; i < nr_pages; i++) {
1778 if (dirtied && !PageReserved(sgl[i].page))
1779 SetPageDirty(sgl[i].page);
1780 /* unlock_page(sgl[i].page); */
1781 /* FIXME: cache flush missing for rw==READ
1782 * FIXME: call the correct reference counting function
1784 page_cache_release(sgl[i].page);
1790 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1794 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1796 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1798 #ifdef SG_ALLOW_DIO_CODE
1799 sg_io_hdr_t *hp = &srp->header;
1800 Sg_scatter_hold *schp = &srp->data;
1801 int sg_tablesize = sfp->parentdp->sg_tablesize;
1802 struct scatterlist *sgl;
1803 int mx_sc_elems, res;
1804 struct scsi_device *sdev = sfp->parentdp->device;
1806 if (((unsigned long)hp->dxferp &
1807 queue_dma_alignment(sdev->request_queue)) != 0)
1809 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1810 if (mx_sc_elems <= 0) {
1813 sgl = (struct scatterlist *)schp->buffer;
1814 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1815 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1818 schp->k_use_sg = res;
1819 schp->dio_in_use = 1;
1820 hp->info |= SG_INFO_DIRECT_IO;
1828 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1831 int blk_size = buff_size;
1832 unsigned char *p = NULL;
1834 if ((blk_size < 0) || (!sfp))
1837 ++blk_size; /* don't know why */
1838 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1839 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1840 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1841 buff_size, blk_size));
1842 if (blk_size <= SG_SCATTER_SZ) {
1843 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1846 if (blk_size == ret_sz) { /* got it on the first attempt */
1849 schp->bufflen = blk_size;
1850 schp->b_malloc_len = blk_size;
1854 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1858 /* Want some local declarations, so start new block ... */
1859 { /* lets try and build a scatter gather list */
1860 struct scatterlist *sclp;
1863 int sg_tablesize = sfp->parentdp->sg_tablesize;
1866 /* N.B. ret_sz carried into this block ... */
1867 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1868 if (mx_sc_elems < 0)
1869 return mx_sc_elems; /* most likely -ENOMEM */
1871 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1872 (rem_sz > 0) && (k < mx_sc_elems);
1873 ++k, rem_sz -= ret_sz, ++sclp) {
1879 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1880 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1884 sclp->page = virt_to_page(p);
1885 sclp->offset = offset_in_page(p);
1886 sclp->length = ret_sz;
1888 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1889 k, sg_scatg2virt(sclp), ret_sz));
1890 } /* end of for loop */
1892 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1893 schp->bufflen = blk_size;
1894 if (rem_sz > 0) /* must have failed */
1901 sg_write_xfer(Sg_request * srp)
1903 sg_io_hdr_t *hp = &srp->header;
1904 Sg_scatter_hold *schp = &srp->data;
1906 int j, k, onum, usglen, ksglen, res;
1907 int iovec_count = (int) hp->iovec_count;
1908 int dxfer_dir = hp->dxfer_direction;
1910 unsigned char __user *up;
1911 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1913 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1914 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1915 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1916 if (schp->bufflen < num_xfer)
1917 num_xfer = schp->bufflen;
1919 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1921 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1924 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1925 num_xfer, iovec_count, schp->k_use_sg));
1928 if ((k = verify_area(VERIFY_READ, hp->dxferp,
1929 SZ_SG_IOVEC * onum)))
1934 if (0 == schp->k_use_sg) { /* kernel has single buffer */
1935 for (j = 0, p = schp->buffer; j < onum; ++j) {
1936 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1939 usglen = (num_xfer > usglen) ? usglen : num_xfer;
1940 if (__copy_from_user(p, up, usglen))
1947 } else { /* kernel using scatter gather list */
1948 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
1950 ksglen = (int) sclp->length;
1951 p = sg_scatg2virt(sclp);
1952 for (j = 0, k = 0; j < onum; ++j) {
1953 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1957 for (; p; ++sclp, ksglen = (int) sclp->length,
1958 p = sg_scatg2virt(sclp)) {
1961 if (ksglen > usglen) {
1962 if (usglen >= num_xfer) {
1963 if (__copy_from_user
1968 if (__copy_from_user(p, up, usglen))
1974 if (ksglen >= num_xfer) {
1975 if (__copy_from_user
1980 if (__copy_from_user(p, up, ksglen))
1986 if (k >= schp->k_use_sg)
1995 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1996 int wr_xf, int *countp, unsigned char __user **up)
1998 int num_xfer = (int) hp->dxfer_len;
1999 unsigned char __user *p = hp->dxferp;
2003 if (wr_xf && ('\0' == hp->interface_id))
2004 count = (int) hp->flags; /* holds "old" input_size */
2009 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2012 count = (int) iovec.iov_len;
2014 if ((k = verify_area(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)))
2024 sg_remove_scat(Sg_scatter_hold * schp)
2026 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2027 if (schp->buffer && (schp->sglist_len > 0)) {
2028 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2030 if (schp->dio_in_use) {
2031 #ifdef SG_ALLOW_DIO_CODE
2032 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2037 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2039 SCSI_LOG_TIMEOUT(5, printk(
2040 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2041 k, sg_scatg2virt(sclp), sclp->length));
2042 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2048 sg_page_free(schp->buffer, schp->sglist_len);
2049 } else if (schp->buffer)
2050 sg_page_free(schp->buffer, schp->b_malloc_len);
2051 memset(schp, 0, sizeof (*schp));
2055 sg_read_xfer(Sg_request * srp)
2057 sg_io_hdr_t *hp = &srp->header;
2058 Sg_scatter_hold *schp = &srp->data;
2060 int j, k, onum, usglen, ksglen, res;
2061 int iovec_count = (int) hp->iovec_count;
2062 int dxfer_dir = hp->dxfer_direction;
2064 unsigned char __user *up;
2065 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2067 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2068 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2069 num_xfer = hp->dxfer_len;
2070 if (schp->bufflen < num_xfer)
2071 num_xfer = schp->bufflen;
2073 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2075 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2078 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2079 num_xfer, iovec_count, schp->k_use_sg));
2082 if ((k = verify_area(VERIFY_READ, hp->dxferp,
2083 SZ_SG_IOVEC * onum)))
2088 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2089 for (j = 0, p = schp->buffer; j < onum; ++j) {
2090 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2093 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2094 if (__copy_to_user(up, p, usglen))
2101 } else { /* kernel using scatter gather list */
2102 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2104 ksglen = (int) sclp->length;
2105 p = sg_scatg2virt(sclp);
2106 for (j = 0, k = 0; j < onum; ++j) {
2107 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2111 for (; p; ++sclp, ksglen = (int) sclp->length,
2112 p = sg_scatg2virt(sclp)) {
2115 if (ksglen > usglen) {
2116 if (usglen >= num_xfer) {
2122 if (__copy_to_user(up, p, usglen))
2128 if (ksglen >= num_xfer) {
2134 if (__copy_to_user(up, p, ksglen))
2140 if (k >= schp->k_use_sg)
2149 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2151 Sg_scatter_hold *schp = &srp->data;
2153 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2155 if ((!outp) || (num_read_xfer <= 0))
2157 if (schp->k_use_sg > 0) {
2159 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2161 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2163 num = (int) sclp->length;
2164 if (num > num_read_xfer) {
2166 (outp, sg_scatg2virt(sclp), num_read_xfer))
2171 (outp, sg_scatg2virt(sclp), num))
2173 num_read_xfer -= num;
2174 if (num_read_xfer <= 0)
2180 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2187 sg_build_reserve(Sg_fd * sfp, int req_size)
2189 Sg_scatter_hold *schp = &sfp->reserve;
2191 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2193 if (req_size < PAGE_SIZE)
2194 req_size = PAGE_SIZE;
2195 if (0 == sg_build_indirect(schp, sfp, req_size))
2198 sg_remove_scat(schp);
2199 req_size >>= 1; /* divide by 2 */
2200 } while (req_size > (PAGE_SIZE / 2));
2204 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2206 Sg_scatter_hold *req_schp = &srp->data;
2207 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2210 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2211 size = (size + 1) & (~1); /* round to even for aha1542 */
2212 if (rsv_schp->k_use_sg > 0) {
2215 struct scatterlist *sclp =
2216 (struct scatterlist *) rsv_schp->buffer;
2218 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2219 num = (int) sclp->length;
2222 req_schp->k_use_sg = 0;
2223 req_schp->buffer = sg_scatg2virt(sclp);
2225 sfp->save_scat_len = num;
2226 sclp->length = (unsigned) rem;
2227 req_schp->k_use_sg = k + 1;
2228 req_schp->sglist_len =
2229 rsv_schp->sglist_len;
2230 req_schp->buffer = rsv_schp->buffer;
2232 req_schp->bufflen = size;
2233 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2238 if (k >= rsv_schp->k_use_sg)
2239 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2241 req_schp->k_use_sg = 0;
2242 req_schp->bufflen = size;
2243 req_schp->buffer = rsv_schp->buffer;
2244 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2249 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2251 Sg_scatter_hold *req_schp = &srp->data;
2252 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2254 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2255 (int) req_schp->k_use_sg));
2256 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2257 struct scatterlist *sclp =
2258 (struct scatterlist *) rsv_schp->buffer;
2260 if (sfp->save_scat_len > 0)
2261 (sclp + (req_schp->k_use_sg - 1))->length =
2262 (unsigned) sfp->save_scat_len;
2264 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2266 req_schp->k_use_sg = 0;
2267 req_schp->bufflen = 0;
2268 req_schp->buffer = NULL;
2269 req_schp->sglist_len = 0;
2270 sfp->save_scat_len = 0;
2275 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2278 unsigned long iflags;
2280 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2281 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2282 /* look for requests that are ready + not SG_IO owned */
2283 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2284 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2285 resp->done = 2; /* guard against other readers */
2289 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2293 #ifdef CONFIG_SCSI_PROC_FS
2295 sg_get_nth_request(Sg_fd * sfp, int nth)
2298 unsigned long iflags;
2301 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2302 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2303 ++k, resp = resp->nextrp) ;
2304 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2309 /* always adds to end of list */
2311 sg_add_request(Sg_fd * sfp)
2314 unsigned long iflags;
2316 Sg_request *rp = sfp->req_arr;
2318 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2321 memset(rp, 0, sizeof (Sg_request));
2326 if (0 == sfp->cmd_q)
2327 resp = NULL; /* command queuing disallowed */
2329 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2333 if (k < SG_MAX_QUEUE) {
2334 memset(rp, 0, sizeof (Sg_request));
2336 while (resp->nextrp)
2337 resp = resp->nextrp;
2345 resp->nextrp = NULL;
2346 resp->header.duration = jiffies;
2347 resp->my_cmdp = NULL;
2349 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2353 /* Return of 1 for found; 0 for not found */
2355 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2357 Sg_request *prev_rp;
2359 unsigned long iflags;
2362 if ((!sfp) || (!srp) || (!sfp->headrp))
2364 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2365 prev_rp = sfp->headrp;
2366 if (srp == prev_rp) {
2367 sfp->headrp = prev_rp->nextrp;
2368 prev_rp->parentfp = NULL;
2371 while ((rp = prev_rp->nextrp)) {
2373 prev_rp->nextrp = rp->nextrp;
2374 rp->parentfp = NULL;
2381 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2385 #ifdef CONFIG_SCSI_PROC_FS
2387 sg_get_nth_sfp(Sg_device * sdp, int nth)
2390 unsigned long iflags;
2393 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2394 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2395 ++k, resp = resp->nextfp) ;
2396 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2402 sg_add_sfp(Sg_device * sdp, int dev)
2405 unsigned long iflags;
2407 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, 0);
2410 memset(sfp, 0, sizeof (Sg_fd));
2411 init_waitqueue_head(&sfp->read_wait);
2412 sfp->rq_list_lock = RW_LOCK_UNLOCKED;
2414 sfp->timeout = SG_DEFAULT_TIMEOUT;
2415 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2416 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2417 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2418 sdp->device->host->unchecked_isa_dma : 1;
2419 sfp->cmd_q = SG_DEF_COMMAND_Q;
2420 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2421 sfp->parentdp = sdp;
2422 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2425 else { /* add to tail of existing list */
2426 Sg_fd *pfp = sdp->headfp;
2431 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2432 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2433 sg_build_reserve(sfp, sg_big_buff);
2434 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2435 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2440 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2445 prev_fp = sdp->headfp;
2447 sdp->headfp = prev_fp->nextfp;
2449 while ((fp = prev_fp->nextfp)) {
2451 prev_fp->nextfp = fp->nextfp;
2457 if (sfp->reserve.bufflen > 0) {
2459 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2460 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2461 if (sfp->mmap_called)
2462 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2463 sg_remove_scat(&sfp->reserve);
2465 sfp->parentdp = NULL;
2466 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2467 sg_page_free((char *) sfp, sizeof (Sg_fd));
2470 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2472 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2479 for (srp = sfp->headrp; srp; srp = tsrp) {
2482 sg_finish_rem_req(srp);
2487 unsigned long iflags;
2489 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2490 __sg_remove_sfp(sdp, sfp);
2491 if (sdp->detached && (NULL == sdp->headfp)) {
2495 for (k = 0; k < maxd; ++k) {
2496 if (sdp == sg_dev_arr[k])
2500 sg_dev_arr[k] = NULL;
2501 vfree((char *) sdp);
2504 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2506 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2507 /* only bump the access_count if we actually succeeded in
2508 * throwing another counter on the host module */
2509 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2510 sfp->closed = 1; /* flag dirty state on this fd */
2511 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2518 sg_res_in_use(Sg_fd * sfp)
2520 const Sg_request *srp;
2521 unsigned long iflags;
2523 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2524 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2527 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2531 /* If retSzp==NULL want exact size or fail */
2533 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2544 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2546 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2548 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2549 order++, a_size <<= 1) ;
2550 resp = (char *) __get_free_pages(page_mask, order);
2551 while ((!resp) && order && retSzp) {
2553 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2554 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2558 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2559 memset(resp, 0, resSz);
2567 sg_page_free(char *buff, int size)
2573 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2574 order++, a_size <<= 1) ;
2575 free_pages((unsigned long) buff, order);
2579 sg_ms_to_jif(unsigned int msecs)
2581 if ((UINT_MAX / 2U) < msecs)
2582 return INT_MAX; /* special case, set largest possible */
2584 return ((int) msecs <
2585 (INT_MAX / 1000)) ? (((int) msecs * HZ) / 1000)
2586 : (((int) msecs / 1000) * HZ);
2589 static inline unsigned
2590 sg_jif_to_ms(int jifs)
2595 unsigned int j = (unsigned int) jifs;
2597 (UINT_MAX / 1000)) ? ((j * 1000) / HZ) : ((j / HZ) *
2602 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2603 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2604 MODE_SENSE, MODE_SENSE_10, LOG_SENSE
2608 sg_allow_access(unsigned char opcode, char dev_type)
2612 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2614 for (k = 0; k < sizeof (allow_ops); ++k) {
2615 if (opcode == allow_ops[k])
2621 #ifdef CONFIG_SCSI_PROC_FS
2626 unsigned long iflags;
2628 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2629 for (k = sg_dev_max - 1; k >= 0; --k)
2630 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2632 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2633 return k + 1; /* origin 1 */
2640 Sg_device *sdp = NULL;
2641 unsigned long iflags;
2643 if (sg_dev_arr && (dev >= 0)) {
2644 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2645 if (dev < sg_dev_max)
2646 sdp = sg_dev_arr[dev];
2647 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2652 #ifdef CONFIG_SCSI_PROC_FS
2654 static struct proc_dir_entry *sg_proc_sgp = NULL;
2656 static char sg_proc_sg_dirname[] = "scsi/sg";
2658 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2660 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2661 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2662 size_t count, loff_t *off);
2663 static struct file_operations adio_fops = {
2664 /* .owner, .read and .llseek added in sg_proc_init() */
2665 .open = sg_proc_single_open_adio,
2666 .write = sg_proc_write_adio,
2667 .release = single_release,
2670 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2671 static ssize_t sg_proc_write_dressz(struct file *filp,
2672 const char __user *buffer, size_t count, loff_t *off);
2673 static struct file_operations dressz_fops = {
2674 .open = sg_proc_single_open_dressz,
2675 .write = sg_proc_write_dressz,
2676 .release = single_release,
2679 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2680 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2681 static struct file_operations version_fops = {
2682 .open = sg_proc_single_open_version,
2683 .release = single_release,
2686 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2687 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2688 static struct file_operations devhdr_fops = {
2689 .open = sg_proc_single_open_devhdr,
2690 .release = single_release,
2693 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2694 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2695 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2696 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2697 static void dev_seq_stop(struct seq_file *s, void *v);
2698 static struct file_operations dev_fops = {
2699 .open = sg_proc_open_dev,
2700 .release = seq_release,
2702 static struct seq_operations dev_seq_ops = {
2703 .start = dev_seq_start,
2704 .next = dev_seq_next,
2705 .stop = dev_seq_stop,
2706 .show = sg_proc_seq_show_dev,
2709 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2710 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2711 static struct file_operations devstrs_fops = {
2712 .open = sg_proc_open_devstrs,
2713 .release = seq_release,
2715 static struct seq_operations devstrs_seq_ops = {
2716 .start = dev_seq_start,
2717 .next = dev_seq_next,
2718 .stop = dev_seq_stop,
2719 .show = sg_proc_seq_show_devstrs,
2722 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2723 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2724 static struct file_operations debug_fops = {
2725 .open = sg_proc_open_debug,
2726 .release = seq_release,
2728 static struct seq_operations debug_seq_ops = {
2729 .start = dev_seq_start,
2730 .next = dev_seq_next,
2731 .stop = dev_seq_stop,
2732 .show = sg_proc_seq_show_debug,
2736 struct sg_proc_leaf {
2738 struct file_operations * fops;
2741 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2742 {"allow_dio", &adio_fops},
2743 {"debug", &debug_fops},
2744 {"def_reserved_size", &dressz_fops},
2745 {"device_hdr", &devhdr_fops},
2746 {"devices", &dev_fops},
2747 {"device_strs", &devstrs_fops},
2748 {"version", &version_fops}
2756 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2757 struct proc_dir_entry *pdep;
2758 struct sg_proc_leaf * leaf;
2760 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
2761 S_IFDIR | S_IRUGO | S_IXUGO, NULL);
2764 for (k = 0; k < num_leaves; ++k) {
2765 leaf = &sg_proc_leaf_arr[k];
2766 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2767 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2769 leaf->fops->owner = THIS_MODULE,
2770 leaf->fops->read = seq_read,
2771 leaf->fops->llseek = seq_lseek,
2772 pdep->proc_fops = leaf->fops;
2779 sg_proc_cleanup(void)
2783 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2787 for (k = 0; k < num_leaves; ++k)
2788 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2789 remove_proc_entry(sg_proc_sg_dirname, NULL);
2793 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2795 seq_printf(s, "%d\n", *((int *)s->private));
2799 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2801 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2805 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2806 size_t count, loff_t *off)
2811 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2813 num = (count < 10) ? count : 10;
2814 if (copy_from_user(buff, buffer, num))
2817 sg_allow_dio = simple_strtoul(buff, 0, 10) ? 1 : 0;
2821 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2823 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2827 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2828 size_t count, loff_t *off)
2831 unsigned long k = ULONG_MAX;
2834 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2836 num = (count < 10) ? count : 10;
2837 if (copy_from_user(buff, buffer, num))
2840 k = simple_strtoul(buff, 0, 10);
2841 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2848 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2850 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2855 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2857 return single_open(file, sg_proc_seq_show_version, NULL);
2860 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2862 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2867 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2869 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2872 struct sg_proc_deviter {
2877 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2879 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2883 if (NULL == sg_dev_arr)
2886 it->max = sg_last_dev();
2887 if (it->index >= it->max)
2895 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2897 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2900 return (it->index < it->max) ? it : NULL;
2903 static void dev_seq_stop(struct seq_file *s, void *v)
2908 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2910 return seq_open(file, &dev_seq_ops);
2913 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2915 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2917 struct scsi_device *scsidp;
2919 sdp = it ? sg_get_dev(it->index) : NULL;
2920 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2921 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2922 scsidp->host->host_no, scsidp->channel,
2923 scsidp->id, scsidp->lun, (int) scsidp->type,
2925 (int) scsidp->queue_depth,
2926 (int) scsidp->device_busy,
2927 (int) scsi_device_online(scsidp));
2929 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2933 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2935 return seq_open(file, &devstrs_seq_ops);
2938 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2940 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2942 struct scsi_device *scsidp;
2944 sdp = it ? sg_get_dev(it->index) : NULL;
2945 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2946 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2947 scsidp->vendor, scsidp->model, scsidp->rev);
2949 seq_printf(s, "<no active device>\n");
2953 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2955 int k, m, new_interface, blen, usg;
2958 const sg_io_hdr_t *hp;
2961 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2962 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2963 "(res)sgat=%d low_dma=%d\n", k + 1,
2964 sg_jif_to_ms(fp->timeout),
2965 fp->reserve.bufflen,
2966 (int) fp->reserve.k_use_sg,
2968 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2969 (int) fp->cmd_q, (int) fp->force_packid,
2970 (int) fp->keep_orphan, (int) fp->closed);
2971 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2973 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2974 if (srp->res_used) {
2975 if (new_interface &&
2976 (SG_FLAG_MMAP_IO & hp->flags))
2981 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2987 blen = srp->my_cmdp ?
2988 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
2989 usg = srp->my_cmdp ?
2990 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
2991 seq_printf(s, srp->done ?
2992 ((1 == srp->done) ? "rcv:" : "fin:")
2993 : (srp->my_cmdp ? "act:" : "prior:"));
2994 seq_printf(s, " id=%d blen=%d",
2995 srp->header.pack_id, blen);
2997 seq_printf(s, " dur=%d", hp->duration);
2999 seq_printf(s, " t_o/elap=%d/%d",
3000 new_interface ? hp->timeout : sg_jif_to_ms(fp->timeout),
3001 sg_jif_to_ms(hp->duration ? (jiffies - hp->duration) : 0));
3002 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
3003 (int) srp->data.cmd_opcode);
3006 seq_printf(s, " No requests active\n");
3010 static int sg_proc_open_debug(struct inode *inode, struct file *file)
3012 return seq_open(file, &debug_seq_ops);
3015 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3017 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3020 if (it && (0 == it->index)) {
3021 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3022 "(origin 1)\n", sg_dev_max, (int)it->max);
3023 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3025 sdp = it ? sg_get_dev(it->index) : NULL;
3027 struct scsi_device *scsidp = sdp->device;
3029 if (NULL == scsidp) {
3030 seq_printf(s, "device %d detached ??\n",
3035 if (sg_get_nth_sfp(sdp, 0)) {
3036 seq_printf(s, " >>> device=%s ",
3037 sdp->disk->disk_name);
3039 seq_printf(s, "detached pending close ");
3042 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3043 scsidp->host->host_no,
3044 scsidp->channel, scsidp->id,
3046 scsidp->host->hostt->emulated);
3047 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3048 sdp->sg_tablesize, sdp->exclude);
3050 sg_proc_debug_helper(s, sdp);
3055 #endif /* CONFIG_SCSI_PROC_FS */
3057 module_init(init_sg);
3058 module_exit(exit_sg);
3059 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);