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 - 2000 Douglas Gilbert
12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
20 #include <linux/config.h>
22 static char * sg_version_str = "Version: 3.1.17 (20001002)";
24 static int sg_version_num = 30117; /* 2 digits for each component */
26 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
27 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
28 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
29 * (otherwise the macros compile to empty statements).
30 * Then before running the program to be debugged enter:
31 * # echo "scsi log timeout 7" > /proc/scsi/scsi
32 * This will send copious output to the console and the log which
33 * is usually /var/log/messages. To turn off debugging enter:
34 * # echo "scsi log timeout 0" > /proc/scsi/scsi
35 * The 'timeout' token was chosen because it is relatively unused.
36 * The token 'hlcomplete' should be used but that triggers too
37 * much output from the sd device driver. To dump the current
38 * state of the SCSI mid level data structures enter:
39 * # echo "scsi dump 1" > /proc/scsi/scsi
40 * To dump the state of sg's data structures use:
41 * # cat /proc/scsi/sg/debug
44 #include <linux/module.h>
47 #include <linux/kernel.h>
48 #include <linux/sched.h>
49 #include <linux/string.h>
51 #include <linux/errno.h>
52 #include <linux/mtio.h>
53 #include <linux/ioctl.h>
54 #include <linux/fcntl.h>
55 #include <linux/init.h>
56 #include <linux/poll.h>
57 #include <linux/smp_lock.h>
60 #include <asm/uaccess.h>
61 #include <asm/system.h>
63 #include <linux/blk.h>
66 #include <scsi/scsi_ioctl.h>
70 #include <linux/proc_fs.h>
71 static int sg_proc_init(void);
72 static void sg_proc_cleanup(void);
75 #ifndef LINUX_VERSION_CODE
76 #include <linux/version.h>
77 #endif /* LINUX_VERSION_CODE */
79 /* #define SG_ALLOW_DIO */
81 #include <linux/iobuf.h>
84 int sg_big_buff = SG_DEF_RESERVED_SIZE;
85 /* N.B. This variable is readable and writeable via
86 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
87 of this size (or less if there is not enough memory) will be reserved
88 for use by this file descriptor. [Deprecated usage: this variable is also
89 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
90 the kernel (i.e. it is not a module).] */
91 static int def_reserved_size = -1; /* picks up init parameter */
93 #define SG_SECTOR_SZ 512
94 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
96 #define SG_LOW_POOL_THRESHHOLD 30
97 #define SG_MAX_POOL_SECTORS 320 /* Max. number of pool sectors to take */
99 static int sg_pool_secs_avail = SG_MAX_POOL_SECTORS;
101 #define SG_HEAP_PAGE 1 /* heap from kernel via get_free_pages() */
102 #define SG_HEAP_KMAL 2 /* heap from kernel via kmalloc() */
103 #define SG_HEAP_POOL 3 /* heap from scsi dma pool (mid-level) */
104 #define SG_USER_MEM 4 /* memory belongs to user space */
106 #define SG_DEV_ARR_LUMP 6 /* amount to over allocate sg_dev_arr by */
109 static int sg_init(void);
110 static int sg_attach(Scsi_Device *);
111 static void sg_finish(void);
112 static int sg_detect(Scsi_Device *);
113 static void sg_detach(Scsi_Device *);
115 static Scsi_Request * dummy_cmdp = 0; /* only used for sizeof */
117 static rwlock_t sg_dev_arr_lock = RW_LOCK_UNLOCKED; /* Also used to lock
118 file descriptor list for device */
120 static struct Scsi_Device_Template sg_template =
124 major:SCSI_GENERIC_MAJOR,
133 typedef struct sg_scatter_hold /* holding area for scsi scatter gather info */
135 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
136 unsigned short sglist_len; /* size of malloc'd scatter-gather list */
137 unsigned bufflen; /* Size of (aggregate) data buffer */
138 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
139 void * buffer; /* Data buffer or scatter list,12 bytes each*/
140 struct kiobuf * kiobp; /* for direct IO information */
141 char mapped; /* indicates kiobp has locked pages */
142 char buffer_mem_src; /* heap whereabouts of 'buffer' */
143 unsigned char cmd_opcode; /* first byte of command */
144 } Sg_scatter_hold; /* 24 bytes long on i386 */
146 struct sg_device; /* forward declarations */
149 typedef struct sg_request /* SG_MAX_QUEUE requests outstanding per file */
151 Scsi_Request * my_cmdp; /* != 0 when request with lower levels */
152 struct sg_request * nextrp; /* NULL -> tail request (slist) */
153 struct sg_fd * parentfp; /* NULL -> not in use */
154 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
155 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
156 unsigned char sense_b[sizeof(dummy_cmdp->sr_sense_buffer)];
157 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
158 char orphan; /* 1 -> drop on sight, 0 -> normal */
159 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
160 char done; /* 0->before bh, 1->before read, 2->read */
161 } Sg_request; /* 168 bytes long on i386 */
163 typedef struct sg_fd /* holds the state of a file descriptor */
165 struct sg_fd * nextfp; /* NULL when last opened fd on this device */
166 struct sg_device * parentdp; /* owning device */
167 wait_queue_head_t read_wait; /* queue read until command done */
168 rwlock_t rq_list_lock; /* protect access to list in req_arr */
169 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
170 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
171 unsigned save_scat_len; /* original length of trunc. scat. element */
172 Sg_request * headrp; /* head of request slist, NULL->empty */
173 struct fasync_struct * async_qp; /* used by asynchronous notification */
174 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
175 char low_dma; /* as in parent but possibly overridden to 1 */
176 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
177 char closed; /* 1 -> fd closed but request(s) outstanding */
178 char fd_mem_src; /* heap whereabouts of this Sg_fd object */
179 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
180 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
181 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
182 } Sg_fd; /* 2768 bytes long on i386 */
184 typedef struct sg_device /* holds the state of each scsi generic device */
186 Scsi_Device * device;
187 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
188 int sg_tablesize; /* adapter's max scatter-gather table size */
189 Sg_fd * headfp; /* first open fd belonging to this device */
191 kdev_t i_rdev; /* holds device major+minor number */
192 char exclude; /* opened for exclusive access */
193 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
194 char detached; /* 0->attached, 1->detached pending removal */
195 } Sg_device; /* 44 bytes long on i386 */
198 static int sg_fasync(int fd, struct file * filp, int mode);
199 static void sg_cmd_done_bh(Scsi_Cmnd * SCpnt);
200 static int sg_start_req(Sg_request * srp);
201 static void sg_finish_rem_req(Sg_request * srp);
202 static int sg_build_indi(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
203 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp);
204 static ssize_t sg_new_read(Sg_fd * sfp, char * buf, size_t count,
206 static ssize_t sg_new_write(Sg_fd * sfp, const char * buf, size_t count,
207 int blocking, int read_only, Sg_request ** o_srp);
208 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
209 unsigned char * cmnd, int timeout, int blocking);
210 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
211 int wr_xf, int * countp, unsigned char ** up);
212 static int sg_write_xfer(Sg_request * srp);
213 static int sg_read_xfer(Sg_request * srp);
214 static void sg_read_oxfer(Sg_request * srp, char * outp, int num_read_xfer);
215 static void sg_remove_scat(Sg_scatter_hold * schp);
216 static char * sg_get_sgat_msa(Sg_scatter_hold * schp);
217 static void sg_build_reserve(Sg_fd * sfp, int req_size);
218 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
219 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
220 static char * sg_malloc(const Sg_fd * sfp, int size, int * retSzp,
222 static void sg_free(char * buff, int size, int mem_src);
223 static char * sg_low_malloc(int rqSz, int lowDma, int mem_src,
225 static void sg_low_free(char * buff, int size, int mem_src);
226 static Sg_fd * sg_add_sfp(Sg_device * sdp, int dev);
227 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
228 static Sg_request * sg_get_rq_mark(Sg_fd * sfp, int pack_id);
229 static Sg_request * sg_add_request(Sg_fd * sfp);
230 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
231 static int sg_res_in_use(Sg_fd * sfp);
232 static int sg_dio_in_use(Sg_fd * sfp);
233 static void sg_clr_srpnt(Scsi_Request * SRpnt);
234 static void sg_shorten_timeout(Scsi_Request * srpnt);
235 static int sg_ms_to_jif(unsigned int msecs);
236 static unsigned sg_jif_to_ms(int jifs);
237 static int sg_allow_access(unsigned char opcode, char dev_type);
238 static int sg_build_dir(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
239 static void sg_unmap_and(Sg_scatter_hold * schp, int free_also);
240 static Sg_device * sg_get_dev(int dev);
241 #ifdef CONFIG_PROC_FS
242 static int sg_last_dev(void);
245 static Sg_device ** sg_dev_arr = NULL;
247 static const int size_sg_header = sizeof(struct sg_header);
248 static const int size_sg_io_hdr = sizeof(sg_io_hdr_t);
249 static const int size_sg_iovec = sizeof(sg_iovec_t);
250 static const int size_sg_req_info = sizeof(sg_req_info_t);
253 static int sg_open(struct inode * inode, struct file * filp)
255 int dev = MINOR(inode->i_rdev);
256 int flags = filp->f_flags;
261 sdp = sg_get_dev(dev);
262 if ((! sdp) || (! sdp->device) || (! sdp->device->host))
264 if (sdp->i_rdev != inode->i_rdev)
265 printk("sg_open: inode maj=%d, min=%d sdp maj=%d, min=%d\n",
266 MAJOR(inode->i_rdev), MINOR(inode->i_rdev),
267 MAJOR(sdp->i_rdev), MINOR(sdp->i_rdev));
268 /* If we are in the middle of error recovery, don't let anyone
269 * else try and use this device. Also, if error recovery fails, it
270 * may try and take the device offline, in which case all further
271 * access to the device is prohibited. */
272 if (! ((flags & O_NONBLOCK) ||
273 scsi_block_when_processing_errors(sdp->device)))
276 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
278 if (flags & O_EXCL) {
279 if (O_RDONLY == (flags & O_ACCMODE))
280 return -EACCES; /* Can't lock it with read only access */
281 if (sdp->headfp && (flags & O_NONBLOCK))
283 res = 0; /* following is a macro that beats race condition */
284 __wait_event_interruptible(sdp->o_excl_wait,
285 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)),
288 return res; /* -ERESTARTSYS because signal hit process */
290 else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
291 if (flags & O_NONBLOCK)
293 res = 0; /* following is a macro that beats race condition */
294 __wait_event_interruptible(sdp->o_excl_wait, (! sdp->exclude), res);
296 return res; /* -ERESTARTSYS because signal hit process */
298 if (! sdp->headfp) { /* no existing opens on this device */
300 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
302 if ((sfp = sg_add_sfp(sdp, dev)))
303 filp->private_data = sfp;
305 if (flags & O_EXCL) sdp->exclude = 0; /* undo if error */
309 if (sdp->device->host->hostt->module)
310 __MOD_INC_USE_COUNT(sdp->device->host->hostt->module);
314 /* Following function was formerly called 'sg_close' */
315 static int sg_release(struct inode * inode, struct file * filp)
321 if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp))) {
325 SCSI_LOG_TIMEOUT(3, printk("sg_release: dev=%d\n", MINOR(sdp->i_rdev)));
326 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
327 sg_remove_sfp(sdp, sfp);
329 filp->private_data = NULL;
331 if (sdp->device->host->hostt->module)
332 __MOD_DEC_USE_COUNT(sdp->device->host->hostt->module);
334 wake_up_interruptible(&sdp->o_excl_wait);
339 static ssize_t sg_read(struct file * filp, char * buf,
340 size_t count, loff_t *ppos)
346 int req_pack_id = -1;
347 struct sg_header old_hdr;
351 if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
353 SCSI_LOG_TIMEOUT(3, printk("sg_read: dev=%d, count=%d\n",
354 MINOR(sdp->i_rdev), (int)count));
355 if (ppos != &filp->f_pos)
356 ; /* FIXME: Hmm. Seek to the right place, or fail? */
357 if ((k = verify_area(VERIFY_WRITE, buf, count)))
359 if (sfp->force_packid && (count >= size_sg_header)) {
360 __copy_from_user(&old_hdr, buf, size_sg_header);
361 if (old_hdr.reply_len < 0) {
362 if (count >= size_sg_io_hdr) {
363 __copy_from_user(&new_hdr, buf, size_sg_io_hdr);
364 req_pack_id = new_hdr.pack_id;
368 req_pack_id = old_hdr.pack_id;
370 srp = sg_get_rq_mark(sfp, req_pack_id);
371 if (! srp) { /* now wait on packet to arrive */
372 if (filp->f_flags & O_NONBLOCK)
375 int dio = sg_dio_in_use(sfp);
376 res = 0; /* following is a macro that beats race condition */
377 __wait_event_interruptible(sfp->read_wait,
378 (srp = sg_get_rq_mark(sfp, req_pack_id)),
382 else if (! dio) /* only let signal out if no dio */
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, size_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;
425 (srp->sense_b[0] == 0 && hp->masked_status == GOOD) ? 0 : EIO;
428 old_hdr.result = EIO;
432 /* Now copy the result back to the user buffer. */
433 if (count >= size_sg_header) {
434 __copy_to_user(buf, &old_hdr, size_sg_header);
435 buf += size_sg_header;
436 if (count > old_hdr.reply_len)
437 count = old_hdr.reply_len;
438 if (count > size_sg_header)
439 sg_read_oxfer(srp, buf, count - size_sg_header);
442 count = (old_hdr.result == 0) ? 0 : -EIO;
443 sg_finish_rem_req(srp);
447 static ssize_t sg_new_read(Sg_fd * sfp, char * buf, size_t count,
450 sg_io_hdr_t * hp = &srp->header;
453 if (count < size_sg_io_hdr)
456 if ((hp->mx_sb_len > 0) && hp->sbp) {
457 if ((CHECK_CONDITION & hp->masked_status) ||
458 (DRIVER_SENSE & hp->driver_status)) {
459 int sb_len = sizeof(dummy_cmdp->sr_sense_buffer);
460 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
461 len = 8 + (int)srp->sense_b[7]; /* Additional sense length field */
462 len = (len > sb_len) ? sb_len : len;
463 if ((k = verify_area(VERIFY_WRITE, hp->sbp, len)))
465 __copy_to_user(hp->sbp, srp->sense_b, len);
469 if (hp->masked_status || hp->host_status || hp->driver_status)
470 hp->info |= SG_INFO_CHECK;
471 copy_to_user(buf, hp, size_sg_io_hdr);
473 k = sg_read_xfer(srp);
474 if (k) return k; /* probably -EFAULT, bad addr in dxferp or iovec list */
475 sg_finish_rem_req(srp);
480 static ssize_t sg_write(struct file * filp, const char * buf,
481 size_t count, loff_t *ppos)
483 int mxsize, cmd_size, k;
484 int input_size, blocking;
485 unsigned char opcode;
489 struct sg_header old_hdr;
491 unsigned char cmnd[sizeof(dummy_cmdp->sr_cmnd)];
493 if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
495 SCSI_LOG_TIMEOUT(3, printk("sg_write: dev=%d, count=%d\n",
496 MINOR(sdp->i_rdev), (int)count));
498 if (! ((filp->f_flags & O_NONBLOCK) ||
499 scsi_block_when_processing_errors(sdp->device)))
501 if (ppos != &filp->f_pos)
502 ; /* FIXME: Hmm. Seek to the right place, or fail? */
504 if ((k = verify_area(VERIFY_READ, buf, count)))
505 return k; /* protects following copy_from_user()s + get_user()s */
506 if (count < size_sg_header)
508 __copy_from_user(&old_hdr, buf, size_sg_header);
509 blocking = !(filp->f_flags & O_NONBLOCK);
510 if (old_hdr.reply_len < 0)
511 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
512 if (count < (size_sg_header + 6))
513 return -EIO; /* The minimum scsi command length is 6 bytes. */
515 if (! (srp = sg_add_request(sfp))) {
516 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
519 buf += size_sg_header;
520 __get_user(opcode, buf);
521 if (sfp->next_cmd_len > 0) {
522 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
523 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
524 sfp->next_cmd_len = 0;
525 sg_remove_request(sfp, srp);
528 cmd_size = sfp->next_cmd_len;
529 sfp->next_cmd_len = 0; /* reset so only this write() effected */
532 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
533 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
536 SCSI_LOG_TIMEOUT(4, printk("sg_write: scsi opcode=0x%02x, cmd_size=%d\n",
537 (int)opcode, cmd_size));
538 /* Determine buffer size. */
539 input_size = count - cmd_size;
540 mxsize = (input_size > old_hdr.reply_len) ? input_size :
542 mxsize -= size_sg_header;
543 input_size -= size_sg_header;
544 if (input_size < 0) {
545 sg_remove_request(sfp, srp);
546 return -EIO; /* User did not pass enough bytes for this command. */
549 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
550 hp->cmd_len = (unsigned char)cmd_size;
554 hp->dxfer_direction = SG_DXFER_UNKNOWN;
557 hp->dxfer_direction = ((old_hdr.reply_len - size_sg_header) > 0) ?
558 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
560 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV :
563 hp->dxfer_len = mxsize;
564 hp->dxferp = (unsigned char *)buf + cmd_size;
566 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
567 hp->flags = input_size; /* structure abuse ... */
568 hp->pack_id = old_hdr.pack_id;
570 __copy_from_user(cmnd, buf, cmd_size);
571 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
572 return (k < 0) ? k : count;
575 static ssize_t sg_new_write(Sg_fd * sfp, const char * buf, size_t count,
576 int blocking, int read_only, Sg_request ** o_srp)
581 unsigned char cmnd[sizeof(dummy_cmdp->sr_cmnd)];
584 if (count < size_sg_io_hdr)
586 if ((k = verify_area(VERIFY_READ, buf, count)))
587 return k; /* protects following copy_from_user()s + get_user()s */
589 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
590 if (! (srp = sg_add_request(sfp))) {
591 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
595 __copy_from_user(hp, buf, size_sg_io_hdr);
596 if (hp->interface_id != 'S') {
597 sg_remove_request(sfp, srp);
600 timeout = sg_ms_to_jif(srp->header.timeout);
601 if ((! hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof(cmnd))) {
602 sg_remove_request(sfp, srp);
605 if ((k = verify_area(VERIFY_READ, hp->cmdp, hp->cmd_len))) {
606 sg_remove_request(sfp, srp);
607 return k; /* protects following copy_from_user()s + get_user()s */
609 __copy_from_user(cmnd, hp->cmdp, hp->cmd_len);
611 (! sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
612 sg_remove_request(sfp, srp);
615 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
617 if (o_srp) *o_srp = srp;
621 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
622 unsigned char * cmnd, int timeout, int blocking)
625 Scsi_Request * SRpnt;
626 Sg_device * sdp = sfp->parentdp;
627 sg_io_hdr_t * hp = &srp->header;
629 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
631 hp->masked_status = 0;
635 hp->driver_status = 0;
638 printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
639 (int)cmnd[0], (int)hp->cmd_len));
641 if ((k = sg_start_req(srp))) {
642 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
643 sg_finish_rem_req(srp);
644 return k; /* probably out of space --> ENOMEM */
646 if ((k = sg_write_xfer(srp))) {
647 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
648 sg_finish_rem_req(srp);
651 /* SCSI_LOG_TIMEOUT(7, printk("sg_write: allocating device\n")); */
652 SRpnt = scsi_allocate_request(sdp->device);
654 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
655 sg_finish_rem_req(srp);
659 /* SCSI_LOG_TIMEOUT(7, printk("sg_write: device allocated\n")); */
660 srp->my_cmdp = SRpnt;
661 SRpnt->sr_request.rq_dev = sdp->i_rdev;
662 SRpnt->sr_request.rq_status = RQ_ACTIVE;
663 SRpnt->sr_sense_buffer[0] = 0;
664 SRpnt->sr_cmd_len = hp->cmd_len;
665 /* Set the LUN field in the command structure, overriding user input */
666 if (! (hp->flags & SG_FLAG_LUN_INHIBIT))
667 cmnd[1] = (cmnd[1] & 0x1f) | (sdp->device->lun << 5);
669 /* SCSI_LOG_TIMEOUT(7, printk("sg_write: do cmd\n")); */
670 SRpnt->sr_use_sg = srp->data.k_use_sg;
671 SRpnt->sr_sglist_len = srp->data.sglist_len;
672 SRpnt->sr_bufflen = srp->data.bufflen;
673 SRpnt->sr_underflow = 0;
674 SRpnt->sr_buffer = srp->data.buffer;
675 switch (hp->dxfer_direction) {
676 case SG_DXFER_TO_FROM_DEV:
677 case SG_DXFER_FROM_DEV:
678 SRpnt->sr_data_direction = SCSI_DATA_READ; break;
679 case SG_DXFER_TO_DEV:
680 SRpnt->sr_data_direction = SCSI_DATA_WRITE; break;
681 case SG_DXFER_UNKNOWN:
682 SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN; break;
684 SRpnt->sr_data_direction = SCSI_DATA_NONE; break;
686 srp->data.k_use_sg = 0;
687 srp->data.sglist_len = 0;
688 srp->data.bufflen = 0;
689 srp->data.buffer = NULL;
690 hp->duration = jiffies; /* unit jiffies now, millisecs after done */
691 /* Now send everything of to mid-level. The next time we hear about this
692 packet is when sg_cmd_done_bh() is called (i.e. a callback). */
693 scsi_do_req(SRpnt, (void *)cmnd,
694 (void *)SRpnt->sr_buffer, hp->dxfer_len,
695 sg_cmd_done_bh, timeout, SG_DEFAULT_RETRIES);
696 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
700 static int sg_ioctl(struct inode * inode, struct file * filp,
701 unsigned int cmd_in, unsigned long arg)
703 int result, val, read_only;
707 unsigned long iflags;
709 if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
711 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: dev=%d, cmd=0x%x\n",
712 MINOR(sdp->i_rdev), (int)cmd_in));
713 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
719 int blocking = 1; /* ignore O_NONBLOCK flag */
721 if(! scsi_block_when_processing_errors(sdp->device) )
723 result = verify_area(VERIFY_WRITE, (void *)arg, size_sg_io_hdr);
724 if (result) return result;
725 result = sg_new_write(sfp, (const char *)arg, size_sg_io_hdr,
726 blocking, read_only, &srp);
727 if (result < 0) return result;
728 srp->sg_io_owned = 1;
730 int dio = sg_dio_in_use(sfp);
731 result = 0; /* following macro to beat race condition */
732 __wait_event_interruptible(sfp->read_wait,
733 (sfp->closed || srp->done), result);
735 return 0; /* request packet dropped already */
738 else if (! dio) { /* only let signal out if no dio */
740 return result; /* -ERESTARTSYS because signal hit process */
744 result = sg_new_read(sfp, (char *)arg, size_sg_io_hdr, srp);
745 return (result < 0) ? result : 0;
748 result = get_user(val, (int *)arg);
749 if (result) return result;
754 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
755 return sfp->timeout; /* strange ..., for backward compatibility */
756 case SG_SET_FORCE_LOW_DMA:
757 result = get_user(val, (int *)arg);
758 if (result) return result;
761 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
762 val = (int)sfp->reserve.bufflen;
763 sg_remove_scat(&sfp->reserve);
764 sg_build_reserve(sfp, val);
768 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
771 return put_user((int)sfp->low_dma, (int *)arg);
773 result = verify_area(VERIFY_WRITE, (void *)arg, sizeof(sg_scsi_id_t));
774 if (result) return result;
776 sg_scsi_id_t * sg_idp = (sg_scsi_id_t *)arg;
777 __put_user((int)sdp->device->host->host_no, &sg_idp->host_no);
778 __put_user((int)sdp->device->channel, &sg_idp->channel);
779 __put_user((int)sdp->device->id, &sg_idp->scsi_id);
780 __put_user((int)sdp->device->lun, &sg_idp->lun);
781 __put_user((int)sdp->device->type, &sg_idp->scsi_type);
782 __put_user((short)sdp->device->host->cmd_per_lun,
783 &sg_idp->h_cmd_per_lun);
784 __put_user((short)sdp->device->queue_depth,
785 &sg_idp->d_queue_depth);
786 __put_user(0, &sg_idp->unused[0]);
787 __put_user(0, &sg_idp->unused[1]);
790 case SG_SET_FORCE_PACK_ID:
791 result = get_user(val, (int *)arg);
792 if (result) return result;
793 sfp->force_packid = val ? 1 : 0;
796 result = verify_area(VERIFY_WRITE, (void *) arg, sizeof(int));
797 if (result) return result;
798 read_lock_irqsave(&sfp->rq_list_lock, iflags);
799 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
800 if ((1 == srp->done) && (! srp->sg_io_owned)) {
801 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
802 __put_user(srp->header.pack_id, (int *)arg);
806 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
807 __put_user(-1, (int *)arg);
809 case SG_GET_NUM_WAITING:
810 read_lock_irqsave(&sfp->rq_list_lock, iflags);
811 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
812 if ((1 == srp->done) && (! srp->sg_io_owned))
815 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
816 return put_user(val, (int *)arg);
817 case SG_GET_SG_TABLESIZE:
818 return put_user(sdp->sg_tablesize, (int *)arg);
819 case SG_SET_RESERVED_SIZE:
820 result = get_user(val, (int *)arg);
821 if (result) return result;
822 if (val != sfp->reserve.bufflen) {
823 if (sg_res_in_use(sfp))
825 sg_remove_scat(&sfp->reserve);
826 sg_build_reserve(sfp, val);
829 case SG_GET_RESERVED_SIZE:
830 val = (int)sfp->reserve.bufflen;
831 return put_user(val, (int *)arg);
832 case SG_SET_COMMAND_Q:
833 result = get_user(val, (int *)arg);
834 if (result) return result;
835 sfp->cmd_q = val ? 1 : 0;
837 case SG_GET_COMMAND_Q:
838 return put_user((int)sfp->cmd_q, (int *)arg);
839 case SG_SET_KEEP_ORPHAN:
840 result = get_user(val, (int *)arg);
841 if (result) return result;
842 sfp->keep_orphan = val;
844 case SG_GET_KEEP_ORPHAN:
845 return put_user((int)sfp->keep_orphan, (int *)arg);
846 case SG_NEXT_CMD_LEN:
847 result = get_user(val, (int *)arg);
848 if (result) return result;
849 sfp->next_cmd_len = (val > 0) ? val : 0;
851 case SG_GET_VERSION_NUM:
852 return put_user(sg_version_num, (int *)arg);
853 case SG_GET_REQUEST_TABLE:
854 result = verify_area(VERIFY_WRITE, (void *) arg,
855 size_sg_req_info * SG_MAX_QUEUE);
856 if (result) return result;
858 sg_req_info_t rinfo[SG_MAX_QUEUE];
860 read_lock_irqsave(&sfp->rq_list_lock, iflags);
861 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
862 ++val, srp = srp ? srp->nextrp : srp) {
863 memset(&rinfo[val], 0, size_sg_req_info);
865 rinfo[val].req_state = srp->done + 1;
866 rinfo[val].problem = srp->header.masked_status &
867 srp->header.host_status & srp->header.driver_status;
868 rinfo[val].duration = srp->done ?
869 srp->header.duration :
870 sg_jif_to_ms(jiffies - srp->header.duration);
871 rinfo[val].orphan = srp->orphan;
872 rinfo[val].sg_io_owned = srp->sg_io_owned;
873 rinfo[val].pack_id = srp->header.pack_id;
874 rinfo[val].usr_ptr = srp->header.usr_ptr;
877 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
878 __copy_to_user((void *)arg, rinfo, size_sg_req_info * SG_MAX_QUEUE);
881 case SG_EMULATED_HOST:
882 return put_user(sdp->device->host->hostt->emulated, (int *)arg);
884 if (filp->f_flags & O_NONBLOCK) {
885 if (sdp->device->host->in_recovery)
888 else if (! scsi_block_when_processing_errors(sdp->device))
890 result = get_user(val, (int *)arg);
891 if (result) return result;
892 if (SG_SCSI_RESET_NOTHING == val)
894 #ifdef SCSI_TRY_RESET_DEVICE
897 case SG_SCSI_RESET_DEVICE:
898 val = SCSI_TRY_RESET_DEVICE;
900 case SG_SCSI_RESET_BUS:
901 val = SCSI_TRY_RESET_BUS;
903 case SG_SCSI_RESET_HOST:
904 val = SCSI_TRY_RESET_HOST;
909 if(! capable(CAP_SYS_ADMIN)) return -EACCES;
910 return (scsi_reset_provider(sdp->device, val) == SUCCESS) ? 0 : -EIO;
912 SCSI_LOG_TIMEOUT(1, printk("sg_ioctl: SG_RESET_SCSI not supported\n"));
915 case SCSI_IOCTL_SEND_COMMAND:
917 unsigned char opcode = WRITE_6;
918 Scsi_Ioctl_Command * siocp = (void *)arg;
920 copy_from_user(&opcode, siocp->data, 1);
921 if (! sg_allow_access(opcode, sdp->device->type))
924 return scsi_ioctl_send_command(sdp->device, (void *)arg);
926 result = get_user(val, (int *)arg);
927 if (result) return result;
928 sdp->sgdebug = (char)val;
930 case SCSI_IOCTL_GET_IDLUN:
931 case SCSI_IOCTL_GET_BUS_NUMBER:
932 case SCSI_IOCTL_PROBE_HOST:
933 case SG_GET_TRANSFORM:
934 return scsi_ioctl(sdp->device, cmd_in, (void *)arg);
937 return -EACCES; /* don't know so take safe approach */
938 return scsi_ioctl(sdp->device, cmd_in, (void *)arg);
942 static unsigned int sg_poll(struct file * filp, poll_table * wait)
944 unsigned int res = 0;
949 unsigned long iflags;
951 if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
953 poll_wait(filp, &sfp->read_wait, wait);
954 read_lock_irqsave(&sfp->rq_list_lock, iflags);
955 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
956 /* if any read waiting, flag it */
957 if ((0 == res) && (1 == srp->done) && (! srp->sg_io_owned))
958 res = POLLIN | POLLRDNORM;
961 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
964 res |= POLLOUT | POLLWRNORM;
966 else if (count < SG_MAX_QUEUE)
967 res |= POLLOUT | POLLWRNORM;
968 SCSI_LOG_TIMEOUT(3, printk("sg_poll: dev=%d, res=0x%x\n",
969 MINOR(sdp->i_rdev), (int)res));
973 static int sg_fasync(int fd, struct file * filp, int mode)
979 if ((! (sfp = (Sg_fd *)filp->private_data)) || (! (sdp = sfp->parentdp)))
981 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: dev=%d, mode=%d\n",
982 MINOR(sdp->i_rdev), mode));
984 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
985 return (retval < 0) ? retval : 0;
988 /* This function is a "bottom half" handler that is called by the
989 * mid level when a command is completed (or has failed). */
990 static void sg_cmd_done_bh(Scsi_Cmnd * SCpnt)
992 Scsi_Request * SRpnt = SCpnt->sc_request;
993 int dev = MINOR(SRpnt->sr_request.rq_dev);
994 Sg_device * sdp = NULL;
996 Sg_request * srp = NULL;
998 read_lock(&sg_dev_arr_lock);
999 if (sg_dev_arr && (dev >= 0)) {
1000 if (dev < sg_template.dev_max)
1001 sdp = sg_dev_arr[dev];
1004 read_unlock(&sg_dev_arr_lock);
1005 SCSI_LOG_TIMEOUT(1, printk("sg...bh: bad args dev=%d\n", dev));
1006 scsi_release_request(SRpnt);
1012 read_lock(&sfp->rq_list_lock);
1013 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1014 if (SRpnt == srp->my_cmdp)
1017 read_unlock(&sfp->rq_list_lock);
1022 read_unlock(&sg_dev_arr_lock);
1024 SCSI_LOG_TIMEOUT(1, printk("sg...bh: req missing, dev=%d\n", dev));
1025 scsi_release_request(SRpnt);
1029 /* First transfer ownership of data buffers to sg_device object. */
1030 srp->data.k_use_sg = SRpnt->sr_use_sg;
1031 srp->data.sglist_len = SRpnt->sr_sglist_len;
1032 srp->data.bufflen = SRpnt->sr_bufflen;
1033 srp->data.buffer = SRpnt->sr_buffer;
1034 sg_clr_srpnt(SRpnt);
1035 srp->my_cmdp = NULL;
1038 SCSI_LOG_TIMEOUT(4, printk("sg...bh: dev=%d, pack_id=%d, res=0x%x\n",
1039 dev, srp->header.pack_id, (int)SRpnt->sr_result));
1040 srp->header.resid = SCpnt->resid;
1041 /* sg_unmap_and(&srp->data, 0); */ /* unmap locked pages a.s.a.p. */
1042 /* N.B. unit of duration changes here from jiffies to millisecs */
1043 srp->header.duration = sg_jif_to_ms(jiffies - (int)srp->header.duration);
1044 if (0 != SRpnt->sr_result) {
1045 memcpy(srp->sense_b, SRpnt->sr_sense_buffer, sizeof(srp->sense_b));
1046 srp->header.status = 0xff & SRpnt->sr_result;
1047 srp->header.masked_status = status_byte(SRpnt->sr_result);
1048 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1049 srp->header.host_status = host_byte(SRpnt->sr_result);
1050 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1051 if ((sdp->sgdebug > 0) &&
1052 ((CHECK_CONDITION == srp->header.masked_status) ||
1053 (COMMAND_TERMINATED == srp->header.masked_status)))
1054 print_req_sense("sg_cmd_done_bh", SRpnt);
1056 /* Following if statement is a patch supplied by Eric Youngdale */
1057 if (driver_byte(SRpnt->sr_result) != 0
1058 && (SRpnt->sr_sense_buffer[0] & 0x7f) == 0x70
1059 && (SRpnt->sr_sense_buffer[2] & 0xf) == UNIT_ATTENTION
1060 && sdp->device->removable) {
1061 /* Detected disc change. Set the bit - this may be used if */
1062 /* there are filesystems using this device. */
1063 sdp->device->changed = 1;
1066 /* Rely on write phase to clean out srp status values, so no "else" */
1068 scsi_release_request(SRpnt);
1070 if (sfp->closed) { /* whoops this fd already released, cleanup */
1072 printk("sg...bh: already closed, freeing ...\n"));
1073 /* should check if module is unloaded <<<<<<< */
1074 sg_finish_rem_req(srp);
1076 if (NULL == sfp->headrp) {
1078 printk("sg...bh: already closed, final cleanup\n"));
1079 sg_remove_sfp(sdp, sfp);
1083 else if (srp && srp->orphan) {
1084 if (sfp->keep_orphan)
1085 srp->sg_io_owned = 0;
1087 sg_finish_rem_req(srp);
1092 /* Now wake up any sg_read() that is waiting for this packet. */
1093 wake_up_interruptible(&sfp->read_wait);
1094 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1098 static struct file_operations sg_fops = {
1105 release: sg_release,
1110 static int sg_detect(Scsi_Device * scsidp)
1112 switch (scsidp->type) {
1117 case TYPE_TAPE: break;
1119 printk("Detected scsi generic sg%d at scsi%d,"
1120 " channel %d, id %d, lun %d, type %d\n",
1121 sg_template.dev_noticed,
1122 scsidp->host->host_no, scsidp->channel,
1123 scsidp->id, scsidp->lun, scsidp->type);
1125 sg_template.dev_noticed++;
1129 /* Driver initialization */
1130 static int sg_init()
1132 static int sg_registered = 0;
1133 unsigned long iflags;
1135 if ((sg_template.dev_noticed == 0) || sg_dev_arr)
1138 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1139 if(!sg_registered) {
1140 if (devfs_register_chrdev(SCSI_GENERIC_MAJOR,"sg",&sg_fops))
1142 printk("Unable to get major %d for generic SCSI device\n",
1143 SCSI_GENERIC_MAJOR);
1144 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1150 SCSI_LOG_TIMEOUT(3, printk("sg_init\n"));
1151 sg_template.dev_max = sg_template.dev_noticed + SG_DEV_ARR_LUMP;
1152 sg_dev_arr = (Sg_device **)kmalloc(sg_template.dev_max *
1153 sizeof(Sg_device *), GFP_ATOMIC);
1154 if (NULL == sg_dev_arr) {
1155 printk("sg_init: no space for sg_dev_arr\n");
1156 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1159 memset(sg_dev_arr, 0, sg_template.dev_max * sizeof(Sg_device *));
1160 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1161 #ifdef CONFIG_PROC_FS
1163 #endif /* CONFIG_PROC_FS */
1168 static int __init sg_def_reserved_size_setup(char *str)
1172 if (get_option(&str, &tmp) == 1) {
1173 def_reserved_size = tmp;
1178 printk("sg_def_reserved_size : usage sg_def_reserved_size=n "
1179 "(n could be 65536, 131072 or 262144)\n");
1184 __setup("sg_def_reserved_size=", sg_def_reserved_size_setup);
1188 static int sg_attach(Scsi_Device * scsidp)
1191 unsigned long iflags;
1194 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1195 if (sg_template.nr_dev >= sg_template.dev_max) { /* try to resize */
1196 Sg_device ** tmp_da;
1197 int tmp_dev_max = sg_template.nr_dev + SG_DEV_ARR_LUMP;
1199 tmp_da = (Sg_device **)kmalloc(tmp_dev_max *
1200 sizeof(Sg_device *), GFP_ATOMIC);
1201 if (NULL == tmp_da) {
1203 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1204 printk("sg_attach: device array cannot be resized\n");
1207 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1208 memcpy(tmp_da, sg_dev_arr, sg_template.dev_max * sizeof(Sg_device *));
1209 kfree((char *)sg_dev_arr);
1210 sg_dev_arr = tmp_da;
1211 sg_template.dev_max = tmp_dev_max;
1214 for(k = 0; k < sg_template.dev_max; k++)
1215 if(! sg_dev_arr[k]) break;
1216 if(k < sg_template.dev_max)
1217 sdp = (Sg_device *)kmalloc(sizeof(Sg_device), GFP_ATOMIC);
1222 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1223 printk("sg_attach: Sg_device cannot be allocated\n");
1227 SCSI_LOG_TIMEOUT(3, printk("sg_attach: dev=%d \n", k));
1228 sdp->device = scsidp;
1229 init_waitqueue_head(&sdp->o_excl_wait);
1234 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1235 sdp->i_rdev = MKDEV(SCSI_GENERIC_MAJOR, k);
1236 sdp->de = devfs_register (scsidp->de, "generic", DEVFS_FL_DEFAULT,
1237 SCSI_GENERIC_MAJOR, k,
1238 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1240 sg_template.nr_dev++;
1241 sg_dev_arr[k] = sdp;
1242 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1246 /* Called at 'finish' of init process, after all attaches */
1247 static void sg_finish(void)
1249 SCSI_LOG_TIMEOUT(3, printk("sg_finish: dma_free_sectors=%u\n",
1250 scsi_dma_free_sectors));
1253 static void sg_detach(Scsi_Device * scsidp)
1256 unsigned long iflags;
1261 if (NULL == sg_dev_arr)
1263 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1264 for (k = 0; k < sg_template.dev_max; k++) {
1265 sdp = sg_dev_arr[k];
1266 if ((NULL == sdp) || (sdp->device != scsidp))
1267 continue; /* dirty but lowers nesting */
1269 for (sfp = sdp->headfp; sfp; sfp = sfp->nextfp) {
1270 /* no lock on request list here */
1271 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1273 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1274 sg_shorten_timeout(srp->my_cmdp);
1275 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1279 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1280 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty, sleep(3)\n", k));
1281 scsi_sleep(3); /* sleep 3 jiffies, hoping for timeout to go off */
1282 devfs_unregister (sdp->de);
1285 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1288 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1289 devfs_unregister (sdp->de);
1291 sg_dev_arr[k] = NULL;
1294 sg_template.nr_dev--;
1295 /* avoid associated device /dev/sg? being incremented
1296 * each time module is inserted/removed , <dan@lectra.fr> */
1297 sg_template.dev_noticed--;
1300 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1304 MODULE_AUTHOR("Douglas Gilbert");
1305 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1306 MODULE_PARM(def_reserved_size, "i");
1307 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1309 static int __init init_sg(void) {
1310 if (def_reserved_size >= 0)
1311 sg_big_buff = def_reserved_size;
1312 sg_template.module = THIS_MODULE;
1313 return scsi_register_module(MODULE_SCSI_DEV, &sg_template);
1316 static void __exit exit_sg( void)
1318 #ifdef CONFIG_PROC_FS
1320 #endif /* CONFIG_PROC_FS */
1321 scsi_unregister_module(MODULE_SCSI_DEV, &sg_template);
1322 devfs_unregister_chrdev(SCSI_GENERIC_MAJOR, "sg");
1323 if(sg_dev_arr != NULL) {
1324 /* Really worrying situation of writes still pending and get here */
1325 /* Strategy: shorten timeout on release + wait on detach ... */
1326 kfree((char *)sg_dev_arr);
1329 sg_template.dev_max = 0;
1334 extern void scsi_times_out (Scsi_Cmnd * SCpnt);
1335 extern void scsi_old_times_out (Scsi_Cmnd * SCpnt);
1338 /* Can't see clean way to abort a command so shorten timeout to 1 jiffy */
1339 static void sg_shorten_timeout(Scsi_Request * srpnt)
1341 #if 0 /* scsi_syms.c is very miserly about exported functions */
1342 scsi_delete_timer(scpnt);
1345 scpnt->timeout_per_command = 1; /* try 1 jiffy (perhaps 0 jiffies) */
1346 if (scpnt->host->hostt->use_new_eh_code)
1347 scsi_add_timer(scpnt, scpnt->timeout_per_command, scsi_times_out);
1349 scsi_add_timer(scpnt, scpnt->timeout_per_command,
1350 scsi_old_times_out);
1352 scsi_sleep(HZ); /* just sleep 1 second and hope ... */
1356 static int sg_start_req(Sg_request * srp)
1359 Sg_fd * sfp = srp->parentfp;
1360 sg_io_hdr_t * hp = &srp->header;
1361 int dxfer_len = (int)hp->dxfer_len;
1362 int dxfer_dir = hp->dxfer_direction;
1363 Sg_scatter_hold * req_schp = &srp->data;
1364 Sg_scatter_hold * rsv_schp = &sfp->reserve;
1366 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1367 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1369 if ((hp->flags & SG_FLAG_DIRECT_IO) &&
1370 (dxfer_dir != SG_DXFER_UNKNOWN) &&
1371 (0 == hp->iovec_count) &&
1372 (! sfp->parentdp->device->host->unchecked_isa_dma)) {
1373 res = sg_build_dir(srp, sfp, dxfer_len);
1374 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1377 if ((! sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) {
1378 sg_link_reserve(sfp, srp, dxfer_len);
1381 res = sg_build_indi(req_schp, sfp, dxfer_len);
1383 sg_remove_scat(req_schp);
1390 static void sg_finish_rem_req(Sg_request * srp)
1392 Sg_fd * sfp = srp->parentfp;
1393 Sg_scatter_hold * req_schp = &srp->data;
1395 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n",
1396 (int)srp->res_used));
1397 sg_unmap_and(&srp->data, 1);
1399 sg_unlink_reserve(sfp, srp);
1401 sg_remove_scat(req_schp);
1402 sg_remove_request(sfp, srp);
1405 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp)
1407 int mem_src, ret_sz;
1408 int sg_bufflen = PAGE_SIZE;
1409 int elem_sz = sizeof(struct scatterlist) + sizeof(char);
1410 int mx_sc_elems = (sg_bufflen / elem_sz) - 1;
1412 mem_src = SG_HEAP_KMAL;
1413 schp->buffer = (struct scatterlist *)sg_malloc(sfp, sg_bufflen,
1415 schp->buffer_mem_src = (char)mem_src;
1418 else if (ret_sz != sg_bufflen) {
1419 sg_bufflen = ret_sz;
1420 mx_sc_elems = (sg_bufflen / elem_sz) - 1;
1422 schp->sglist_len = sg_bufflen;
1423 memset(schp->buffer, 0, sg_bufflen);
1424 return mx_sc_elems; /* number of scat_gath elements allocated */
1427 static void sg_unmap_and(Sg_scatter_hold * schp, int free_also)
1430 if (schp && schp->kiobp) {
1432 unmap_kiobuf(schp->kiobp);
1436 free_kiovec(1, &schp->kiobp);
1443 static int sg_build_dir(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1446 int res, k, split, offset, num, mx_sc_elems, rem_sz;
1449 struct scatterlist * sclp;
1450 unsigned long addr, prev_addr;
1451 sg_io_hdr_t * hp = &srp->header;
1452 Sg_scatter_hold * schp = &srp->data;
1453 int sg_tablesize = sfp->parentdp->sg_tablesize;
1455 res = alloc_kiovec(1, &schp->kiobp);
1457 SCSI_LOG_TIMEOUT(5, printk("sg_build_dir: alloc_kiovec res=%d\n", res));
1460 res = map_user_kiobuf((SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0,
1461 schp->kiobp, (unsigned long)hp->dxferp, dxfer_len);
1464 printk("sg_build_dir: map_user_kiobuf res=%d\n", res));
1465 sg_unmap_and(schp, 1);
1470 prev_addr = (unsigned long) page_address(kp->maplist[0]);
1471 for (k = 1, split = 0; k < kp->nr_pages; ++k, prev_addr = addr) {
1472 addr = (unsigned long) page_address(kp->maplist[k]);
1473 if ((prev_addr + PAGE_SIZE) != addr) {
1480 schp->buffer = page_address(kp->maplist[0]) + kp->offset;
1481 schp->bufflen = dxfer_len;
1482 schp->buffer_mem_src = SG_USER_MEM;
1483 schp->b_malloc_len = dxfer_len;
1484 hp->info |= SG_INFO_DIRECT_IO;
1487 mx_sc_elems = sg_build_sgat(schp, sfp);
1488 if (mx_sc_elems <= 1) {
1489 sg_unmap_and(schp, 1);
1490 sg_remove_scat(schp);
1493 mem_src_arr = schp->buffer + (mx_sc_elems * sizeof(struct scatterlist));
1494 for (k = 0, sclp = schp->buffer, rem_sz = dxfer_len;
1495 (k < sg_tablesize) && (rem_sz > 0) && (k < mx_sc_elems);
1497 offset = (0 == k) ? kp->offset : 0;
1498 num = (rem_sz > (PAGE_SIZE - offset)) ? (PAGE_SIZE - offset) :
1500 sclp->address = page_address(kp->maplist[k]) + offset;
1502 mem_src_arr[k] = SG_USER_MEM;
1505 printk("sg_build_dir: k=%d, a=0x%p, len=%d, ms=%d\n",
1506 k, sclp->address, num, mem_src_arr[k]));
1510 printk("sg_build_dir: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1511 schp->bufflen = dxfer_len;
1512 if (rem_sz > 0) { /* must have failed */
1513 sg_unmap_and(schp, 1);
1514 sg_remove_scat(schp);
1515 return 1; /* out of scatter gather elements, try indirect */
1517 hp->info |= SG_INFO_DIRECT_IO;
1521 #endif /* SG_ALLOW_DIO */
1524 static int sg_build_indi(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1526 int ret_sz, mem_src;
1527 int blk_size = buff_size;
1530 if ((blk_size < 0) || (! sfp))
1533 ++blk_size; /* don't know why */
1534 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1535 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1536 SCSI_LOG_TIMEOUT(4, printk("sg_build_indi: buff_size=%d, blk_size=%d\n",
1537 buff_size, blk_size));
1538 if (blk_size <= SG_SCATTER_SZ) {
1539 mem_src = SG_HEAP_PAGE;
1540 p = sg_malloc(sfp, blk_size, &ret_sz, &mem_src);
1543 if (blk_size == ret_sz) { /* got it on the first attempt */
1546 schp->bufflen = blk_size;
1547 schp->buffer_mem_src = (char)mem_src;
1548 schp->b_malloc_len = blk_size;
1553 mem_src = SG_HEAP_PAGE;
1554 p = sg_malloc(sfp, SG_SCATTER_SZ, &ret_sz, &mem_src);
1558 /* Want some local declarations, so start new block ... */
1559 { /* lets try and build a scatter gather list */
1560 struct scatterlist * sclp;
1563 int sg_tablesize = sfp->parentdp->sg_tablesize;
1567 /* N.B. ret_sz and mem_src carried into this block ... */
1568 mx_sc_elems = sg_build_sgat(schp, sfp);
1569 if (mx_sc_elems < 0)
1570 return mx_sc_elems; /* most likely -ENOMEM */
1571 mem_src_arr = schp->buffer +
1572 (mx_sc_elems * sizeof(struct scatterlist));
1574 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1575 (k < sg_tablesize) && (rem_sz > 0) && (k < mx_sc_elems);
1576 ++k, rem_sz -= ret_sz, ++sclp) {
1580 num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1581 mem_src = SG_HEAP_PAGE;
1582 p = sg_malloc(sfp, num, &ret_sz, &mem_src);
1587 sclp->length = ret_sz;
1588 mem_src_arr[k] = mem_src;
1591 printk("sg_build_build: k=%d, a=0x%p, len=%d, ms=%d\n",
1592 k, sclp->address, ret_sz, mem_src));
1593 } /* end of for loop */
1596 printk("sg_build_indi: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1597 schp->bufflen = blk_size;
1598 if (rem_sz > 0) /* must have failed */
1604 static int sg_write_xfer(Sg_request * srp)
1606 sg_io_hdr_t * hp = &srp->header;
1607 Sg_scatter_hold * schp = &srp->data;
1609 int j, k, onum, usglen, ksglen, res, ok;
1610 int iovec_count = (int)hp->iovec_count;
1611 int dxfer_dir = hp->dxfer_direction;
1614 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1616 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1617 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1618 num_xfer = (int)(new_interface ? hp->dxfer_len : hp->flags);
1619 if (schp->bufflen < num_xfer)
1620 num_xfer = schp->bufflen;
1622 if ((num_xfer <= 0) || (new_interface && (SG_FLAG_NO_DXFER & hp->flags)))
1626 printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1627 num_xfer, iovec_count, schp->k_use_sg));
1630 if ((k = verify_area(VERIFY_READ, hp->dxferp,
1631 size_sg_iovec * onum)))
1637 if (0 == schp->k_use_sg) { /* kernel has single buffer */
1638 if (SG_USER_MEM != schp->buffer_mem_src) { /* else nothing to do */
1640 for (j = 0, p = schp->buffer; j < onum; ++j) {
1641 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1642 if (res) return res;
1643 usglen = (num_xfer > usglen) ? usglen : num_xfer;
1644 __copy_from_user(p, up, usglen);
1652 else { /* kernel using scatter gather list */
1653 struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
1654 char * mem_src_arr = sg_get_sgat_msa(schp);
1655 ksglen = (int)sclp->length;
1658 for (j = 0, k = 0; j < onum; ++j) {
1659 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1660 if (res) return res;
1662 for (; (k < schp->k_use_sg) && p;
1663 ++k, ++sclp, ksglen = (int)sclp->length, p = sclp->address) {
1664 ok = (SG_USER_MEM != mem_src_arr[k]);
1667 if (ksglen > usglen) {
1668 if (usglen >= num_xfer) {
1669 if (ok) __copy_from_user(p, up, num_xfer);
1672 if (ok) __copy_from_user(p, up, usglen);
1678 if (ksglen >= num_xfer) {
1679 if (ok) __copy_from_user(p, up, num_xfer);
1682 if (ok) __copy_from_user(p, up, ksglen);
1692 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1693 int wr_xf, int * countp, unsigned char ** up)
1695 int num_xfer = (int)hp->dxfer_len;
1701 p = (unsigned char *)hp->dxferp;
1702 if (wr_xf && ('\0' == hp->interface_id))
1703 count = (int)hp->flags; /* holds "old" input_size */
1708 __copy_from_user(&u_iovec,
1709 (unsigned char *)hp->dxferp + (ind * size_sg_iovec),
1711 p = (unsigned char *)u_iovec.iov_base;
1712 count = (int)u_iovec.iov_len;
1714 if ((k = verify_area(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)))
1717 if (countp) *countp = count;
1721 static char * sg_get_sgat_msa(Sg_scatter_hold * schp)
1723 int elem_sz = sizeof(struct scatterlist) + sizeof(char);
1724 int mx_sc_elems = (schp->sglist_len / elem_sz) - 1;
1725 return schp->buffer + (sizeof(struct scatterlist) * mx_sc_elems);
1728 static void sg_remove_scat(Sg_scatter_hold * schp)
1730 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n",
1732 if (schp->buffer && schp->sglist_len) {
1734 struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
1735 char * mem_src_arr = sg_get_sgat_msa(schp);
1737 for (k = 0; (k < schp->k_use_sg) && sclp->address; ++k, ++sclp) {
1738 mem_src = mem_src_arr[k];
1740 printk("sg_remove_scat: k=%d, a=0x%p, len=%d, ms=%d\n",
1741 k, sclp->address, sclp->length, mem_src));
1742 sg_free(sclp->address, sclp->length, mem_src);
1743 sclp->address = NULL;
1746 sg_free(schp->buffer, schp->sglist_len, schp->buffer_mem_src);
1748 else if (schp->buffer)
1749 sg_free(schp->buffer, schp->b_malloc_len, schp->buffer_mem_src);
1750 memset(schp, 0, sizeof(*schp));
1753 static int sg_read_xfer(Sg_request * srp)
1755 sg_io_hdr_t * hp = &srp->header;
1756 Sg_scatter_hold * schp = &srp->data;
1758 int j, k, onum, usglen, ksglen, res, ok;
1759 int iovec_count = (int)hp->iovec_count;
1760 int dxfer_dir = hp->dxfer_direction;
1763 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1765 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) ||
1766 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1767 num_xfer = hp->dxfer_len;
1768 if (schp->bufflen < num_xfer)
1769 num_xfer = schp->bufflen;
1771 if ((num_xfer <= 0) || (new_interface && (SG_FLAG_NO_DXFER & hp->flags)))
1775 printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1776 num_xfer, iovec_count, schp->k_use_sg));
1779 if ((k = verify_area(VERIFY_READ, hp->dxferp,
1780 size_sg_iovec * onum)))
1786 if (0 == schp->k_use_sg) { /* kernel has single buffer */
1787 if (SG_USER_MEM != schp->buffer_mem_src) { /* else nothing to do */
1789 for (j = 0, p = schp->buffer; j < onum; ++j) {
1790 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
1791 if (res) return res;
1792 usglen = (num_xfer > usglen) ? usglen : num_xfer;
1793 __copy_to_user(up, p, usglen);
1801 else { /* kernel using scatter gather list */
1802 struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
1803 char * mem_src_arr = sg_get_sgat_msa(schp);
1804 ksglen = (int)sclp->length;
1807 for (j = 0, k = 0; j < onum; ++j) {
1808 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
1809 if (res) return res;
1811 for (; (k < schp->k_use_sg) && p;
1812 ++k, ++sclp, ksglen = (int)sclp->length, p = sclp->address) {
1813 ok = (SG_USER_MEM != mem_src_arr[k]);
1816 if (ksglen > usglen) {
1817 if (usglen >= num_xfer) {
1818 if (ok) __copy_to_user(up, p, num_xfer);
1821 if (ok) __copy_to_user(up, p, usglen);
1827 if (ksglen >= num_xfer) {
1828 if (ok) __copy_to_user(up, p, num_xfer);
1831 if (ok) __copy_to_user(up, p, ksglen);
1841 static void sg_read_oxfer(Sg_request * srp, char * outp, int num_read_xfer)
1843 Sg_scatter_hold * schp = &srp->data;
1845 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1847 if ((! outp) || (num_read_xfer <= 0))
1849 if(schp->k_use_sg > 0) {
1851 struct scatterlist * sclp = (struct scatterlist *)schp->buffer;
1853 for (k = 0; (k < schp->k_use_sg) && sclp->address; ++k, ++sclp) {
1854 num = (int)sclp->length;
1855 if (num > num_read_xfer) {
1856 __copy_to_user(outp, sclp->address, num_read_xfer);
1860 __copy_to_user(outp, sclp->address, num);
1861 num_read_xfer -= num;
1862 if (num_read_xfer <= 0)
1869 __copy_to_user(outp, schp->buffer, num_read_xfer);
1872 static void sg_build_reserve(Sg_fd * sfp, int req_size)
1874 Sg_scatter_hold * schp = &sfp->reserve;
1876 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1878 if (req_size < PAGE_SIZE)
1879 req_size = PAGE_SIZE;
1880 if (0 == sg_build_indi(schp, sfp, req_size))
1883 sg_remove_scat(schp);
1884 req_size >>= 1; /* divide by 2 */
1885 } while (req_size > (PAGE_SIZE / 2));
1888 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1890 Sg_scatter_hold * req_schp = &srp->data;
1891 Sg_scatter_hold * rsv_schp = &sfp->reserve;
1894 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1895 size = (size + 1) & (~1); /* round to even for aha1542 */
1896 if (rsv_schp->k_use_sg > 0) {
1899 struct scatterlist * sclp = (struct scatterlist *)rsv_schp->buffer;
1901 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1902 num = (int)sclp->length;
1905 req_schp->k_use_sg = 0;
1906 req_schp->buffer = sclp->address;
1909 sfp->save_scat_len = num;
1910 sclp->length = (unsigned)rem;
1911 req_schp->k_use_sg = k + 1;
1912 req_schp->sglist_len = rsv_schp->sglist_len;
1913 req_schp->buffer = rsv_schp->buffer;
1915 req_schp->bufflen = size;
1916 req_schp->buffer_mem_src = rsv_schp->buffer_mem_src;
1917 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
1923 if (k >= rsv_schp->k_use_sg)
1924 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1927 req_schp->k_use_sg = 0;
1928 req_schp->bufflen = size;
1929 req_schp->buffer = rsv_schp->buffer;
1930 req_schp->buffer_mem_src = rsv_schp->buffer_mem_src;
1931 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
1935 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1937 Sg_scatter_hold * req_schp = &srp->data;
1938 Sg_scatter_hold * rsv_schp = &sfp->reserve;
1940 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1941 (int)req_schp->k_use_sg));
1942 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
1943 struct scatterlist * sclp = (struct scatterlist *)rsv_schp->buffer;
1945 if (sfp->save_scat_len > 0)
1946 (sclp + (req_schp->k_use_sg - 1))->length =
1947 (unsigned)sfp->save_scat_len;
1949 SCSI_LOG_TIMEOUT(1, printk(
1950 "sg_unlink_reserve: BAD save_scat_len\n"));
1952 req_schp->k_use_sg = 0;
1953 req_schp->bufflen = 0;
1954 req_schp->buffer = NULL;
1955 req_schp->sglist_len = 0;
1956 sfp->save_scat_len = 0;
1960 static Sg_request * sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1963 unsigned long iflags;
1965 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1966 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1967 /* look for requests that are ready + not SG_IO owned */
1968 if ((1 == resp->done) && (! resp->sg_io_owned) &&
1969 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1970 resp->done = 2; /* guard against other readers */
1974 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1978 #ifdef CONFIG_PROC_FS
1979 static Sg_request * sg_get_nth_request(Sg_fd * sfp, int nth)
1982 unsigned long iflags;
1985 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1986 for (k = 0, resp = sfp->headrp; resp && (k < nth);
1987 ++k, resp = resp->nextrp)
1989 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1994 /* always adds to end of list */
1995 static Sg_request * sg_add_request(Sg_fd * sfp)
1998 unsigned long iflags;
2000 Sg_request * rp = sfp->req_arr;
2002 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2005 memset(rp, 0, sizeof(Sg_request));
2011 if (0 == sfp->cmd_q)
2012 resp = NULL; /* command queuing disallowed */
2014 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2018 if (k < SG_MAX_QUEUE) {
2019 memset(rp, 0, sizeof(Sg_request));
2021 while (resp->nextrp)
2022 resp = resp->nextrp;
2031 resp->nextrp = NULL;
2032 resp->header.duration = jiffies;
2033 resp->my_cmdp = NULL;
2034 resp->data.kiobp = NULL;
2036 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2040 /* Return of 1 for found; 0 for not found */
2041 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2043 Sg_request * prev_rp;
2045 unsigned long iflags;
2048 if ((! sfp) || (! srp) || (! sfp->headrp))
2050 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2051 prev_rp = sfp->headrp;
2052 if (srp == prev_rp) {
2053 sfp->headrp = prev_rp->nextrp;
2054 prev_rp->parentfp = NULL;
2058 while ((rp = prev_rp->nextrp)) {
2060 prev_rp->nextrp = rp->nextrp;
2061 rp->parentfp = NULL;
2068 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2072 #ifdef CONFIG_PROC_FS
2073 static Sg_fd * sg_get_nth_sfp(Sg_device * sdp, int nth)
2076 unsigned long iflags;
2079 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2080 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2081 ++k, resp = resp->nextfp)
2083 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2088 static Sg_fd * sg_add_sfp(Sg_device * sdp, int dev)
2091 unsigned long iflags;
2093 sfp = (Sg_fd *)sg_low_malloc(sizeof(Sg_fd), 0, SG_HEAP_KMAL, 0);
2096 memset(sfp, 0, sizeof(Sg_fd));
2097 sfp->fd_mem_src = SG_HEAP_KMAL;
2098 init_waitqueue_head(&sfp->read_wait);
2099 sfp->rq_list_lock = RW_LOCK_UNLOCKED;
2101 sfp->timeout = SG_DEFAULT_TIMEOUT;
2102 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2103 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2104 sdp->device->host->unchecked_isa_dma : 1;
2105 sfp->cmd_q = SG_DEF_COMMAND_Q;
2106 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2107 sfp->parentdp = sdp;
2108 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2111 else { /* add to tail of existing list */
2112 Sg_fd * pfp = sdp->headfp;
2117 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2118 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p, m_s=%d\n",
2119 sfp, (int)sfp->fd_mem_src));
2120 sg_build_reserve(sfp, sg_big_buff);
2121 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2122 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2126 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2138 sg_finish_rem_req(srp);
2147 unsigned long iflags;
2149 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2150 prev_fp = sdp->headfp;
2152 sdp->headfp = prev_fp->nextfp;
2154 while ((fp = prev_fp->nextfp)) {
2156 prev_fp->nextfp = fp->nextfp;
2162 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2163 if (sfp->reserve.bufflen > 0) {
2164 SCSI_LOG_TIMEOUT(6, printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2165 (int)sfp->reserve.bufflen, (int)sfp->reserve.k_use_sg));
2166 sg_remove_scat(&sfp->reserve);
2168 sfp->parentdp = NULL;
2169 SCSI_LOG_TIMEOUT(6, printk("sg_remove_sfp: sfp=0x%p\n", sfp));
2170 sg_low_free((char *)sfp, sizeof(Sg_fd), sfp->fd_mem_src);
2171 if (sdp->detached && (NULL == sdp->headfp)) {
2174 maxd = sg_template.dev_max;
2175 for (k = 0; k < maxd; ++k) {
2176 if (sdp == sg_dev_arr[k])
2180 sg_dev_arr[k] = NULL;
2186 sfp->closed = 1; /* flag dirty state on this fd */
2187 SCSI_LOG_TIMEOUT(1, printk(
2188 "sg_remove_sfp: worrisome, %d writes pending\n", dirty));
2193 static int sg_res_in_use(Sg_fd * sfp)
2195 const Sg_request * srp;
2196 unsigned long iflags;
2198 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2199 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2200 if (srp->res_used) break;
2201 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2205 static int sg_dio_in_use(Sg_fd * sfp)
2207 const Sg_request * srp;
2208 unsigned long iflags;
2210 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2211 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2212 if ((! srp->done) && srp->data.kiobp) break;
2213 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2217 /* If retSzp==NULL want exact size or fail */
2218 /* sg_low_malloc() should always be called from a process context allowing
2219 GFP_KERNEL to be used instead of GFP_ATOMIC */
2220 static char * sg_low_malloc(int rqSz, int lowDma, int mem_src, int * retSzp)
2223 int page_mask = lowDma ? (GFP_KERNEL | GFP_DMA) : GFP_KERNEL;
2227 if (SG_HEAP_KMAL == mem_src) {
2228 page_mask = lowDma ? (GFP_ATOMIC | GFP_DMA) : GFP_ATOMIC;
2229 /* Seen kmalloc(..,GFP_KERNEL) hang for 40 secs! */
2230 resp = kmalloc(rqSz, page_mask);
2231 if (resp && retSzp) *retSzp = rqSz;
2234 if (SG_HEAP_POOL == mem_src) {
2235 int num_sect = rqSz / SG_SECTOR_SZ;
2237 if (0 != (rqSz & SG_SECTOR_MSK)) {
2241 rqSz = num_sect * SG_SECTOR_SZ;
2243 while (num_sect > 0) {
2244 if ((num_sect <= sg_pool_secs_avail) &&
2245 (scsi_dma_free_sectors > (SG_LOW_POOL_THRESHHOLD + num_sect))) {
2246 resp = scsi_malloc(rqSz);
2248 if (retSzp) *retSzp = rqSz;
2249 sg_pool_secs_avail -= num_sect;
2255 num_sect /= 2; /* try half as many */
2256 rqSz = num_sect * SG_SECTOR_SZ;
2259 else if (SG_HEAP_PAGE == mem_src) {
2263 for (order = 0, a_size = PAGE_SIZE;
2264 a_size < rqSz; order++, a_size <<= 1)
2266 resp = (char *)__get_free_pages(page_mask, order);
2267 while ((! resp) && order && retSzp) {
2269 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2270 resp = (char *)__get_free_pages(page_mask, order); /* try half */
2273 if (retSzp) *retSzp = resSz;
2276 printk("sg_low_malloc: bad mem_src=%d, rqSz=%df\n", mem_src, rqSz);
2280 static char * sg_malloc(const Sg_fd * sfp, int size, int * retSzp,
2285 if (retSzp) *retSzp = size;
2289 int low_dma = sfp->low_dma;
2290 int l_ms = -1; /* invalid value */
2295 l_ms = (size < PAGE_SIZE) ? SG_HEAP_POOL : SG_HEAP_PAGE;
2296 resp = sg_low_malloc(size, low_dma, l_ms, 0);
2299 resp = sg_low_malloc(size, low_dma, l_ms, &size);
2301 l_ms = (SG_HEAP_POOL == l_ms) ? SG_HEAP_PAGE : SG_HEAP_POOL;
2302 resp = sg_low_malloc(size, low_dma, l_ms, &size);
2304 l_ms = SG_HEAP_KMAL;
2305 resp = sg_low_malloc(size, low_dma, l_ms, &size);
2308 if (resp && retSzp) *retSzp = size;
2311 l_ms = SG_HEAP_PAGE;
2312 resp = sg_low_malloc(size, low_dma, l_ms, 0);
2315 l_ms = SG_HEAP_POOL;
2316 resp = sg_low_malloc(size, low_dma, l_ms, &size);
2317 if (resp && retSzp) *retSzp = size;
2320 SCSI_LOG_TIMEOUT(1, printk("sg_malloc: bad ms=%d\n", *mem_srcp));
2323 if (resp) *mem_srcp = l_ms;
2325 SCSI_LOG_TIMEOUT(6, printk("sg_malloc: size=%d, ms=%d, ret=0x%p\n",
2326 size, *mem_srcp, resp));
2330 static void sg_low_free(char * buff, int size, int mem_src)
2336 int num_sect = size / SG_SECTOR_SZ;
2338 scsi_free(buff, size);
2339 sg_pool_secs_avail += num_sect;
2343 kfree(buff); /* size not used */
2348 for (order = 0, a_size = PAGE_SIZE;
2349 a_size < size; order++, a_size <<= 1)
2351 free_pages((unsigned long)buff, order);
2355 break; /* nothing to do */
2357 printk("sg_low_free: bad mem_src=%d, buff=0x%p, rqSz=%df\n",
2358 mem_src, buff, size);
2363 static void sg_free(char * buff, int size, int mem_src)
2366 printk("sg_free: buff=0x%p, size=%d\n", buff, size));
2367 if ((! buff) || (size <= 0))
2370 sg_low_free(buff, size, mem_src);
2373 static void sg_clr_srpnt(Scsi_Request * SRpnt)
2375 SRpnt->sr_use_sg = 0;
2376 SRpnt->sr_sglist_len = 0;
2377 SRpnt->sr_bufflen = 0;
2378 SRpnt->sr_buffer = NULL;
2379 SRpnt->sr_underflow = 0;
2380 SRpnt->sr_request.rq_dev = MKDEV(0, 0); /* "sg" _disowns_ command blk */
2383 static int sg_ms_to_jif(unsigned int msecs)
2385 if ((UINT_MAX / 2U) < msecs)
2386 return INT_MAX; /* special case, set largest possible */
2388 return ((int)msecs < (INT_MAX / 1000)) ? (((int)msecs * HZ) / 1000)
2389 : (((int)msecs / 1000) * HZ);
2392 static unsigned sg_jif_to_ms(int jifs)
2397 unsigned int j = (unsigned int)jifs;
2398 return (j < (UINT_MAX / 1000)) ? ((j * 1000) / HZ) : ((j / HZ) * 1000);
2402 static unsigned char allow_ops[] = {TEST_UNIT_READY, INQUIRY,
2403 READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2404 MODE_SENSE, MODE_SENSE_10};
2406 static int sg_allow_access(unsigned char opcode, char dev_type)
2410 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2412 for (k = 0; k < sizeof(allow_ops); ++k) {
2413 if (opcode == allow_ops[k])
2420 #ifdef CONFIG_PROC_FS
2421 static int sg_last_dev()
2424 unsigned long iflags;
2426 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2427 for (k = sg_template.dev_max - 1; k >= 0; --k)
2428 if (sg_dev_arr[k] && sg_dev_arr[k]->device) break;
2429 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2430 return k + 1; /* origin 1 */
2434 static Sg_device * sg_get_dev(int dev)
2436 Sg_device * sdp = NULL;
2437 unsigned long iflags;
2439 if (sg_dev_arr && (dev >= 0))
2441 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2442 if (dev < sg_template.dev_max)
2443 sdp = sg_dev_arr[dev];
2444 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2449 #ifdef CONFIG_PROC_FS
2451 static struct proc_dir_entry * sg_proc_sgp = NULL;
2453 static const char * sg_proc_sg_dirname = "sg";
2454 static const char * sg_proc_leaf_names[] = {"def_reserved_size", "debug",
2455 "devices", "device_hdr", "device_strs",
2456 "hosts", "host_hdr", "host_strs", "version"};
2458 static int sg_proc_dressz_read(char * buffer, char ** start, off_t offset,
2459 int size, int * eof, void * data);
2460 static int sg_proc_dressz_info(char * buffer, int * len, off_t * begin,
2461 off_t offset, int size);
2462 static int sg_proc_dressz_write(struct file * filp, const char * buffer,
2463 unsigned long count, void * data);
2464 static int sg_proc_debug_read(char * buffer, char ** start, off_t offset,
2465 int size, int * eof, void * data);
2466 static int sg_proc_debug_info(char * buffer, int * len, off_t * begin,
2467 off_t offset, int size);
2468 static int sg_proc_dev_read(char * buffer, char ** start, off_t offset,
2469 int size, int * eof, void * data);
2470 static int sg_proc_dev_info(char * buffer, int * len, off_t * begin,
2471 off_t offset, int size);
2472 static int sg_proc_devhdr_read(char * buffer, char ** start, off_t offset,
2473 int size, int * eof, void * data);
2474 static int sg_proc_devhdr_info(char * buffer, int * len, off_t * begin,
2475 off_t offset, int size);
2476 static int sg_proc_devstrs_read(char * buffer, char ** start, off_t offset,
2477 int size, int * eof, void * data);
2478 static int sg_proc_devstrs_info(char * buffer, int * len, off_t * begin,
2479 off_t offset, int size);
2480 static int sg_proc_host_read(char * buffer, char ** start, off_t offset,
2481 int size, int * eof, void * data);
2482 static int sg_proc_host_info(char * buffer, int * len, off_t * begin,
2483 off_t offset, int size);
2484 static int sg_proc_hosthdr_read(char * buffer, char ** start, off_t offset,
2485 int size, int * eof, void * data);
2486 static int sg_proc_hosthdr_info(char * buffer, int * len, off_t * begin,
2487 off_t offset, int size);
2488 static int sg_proc_hoststrs_read(char * buffer, char ** start, off_t offset,
2489 int size, int * eof, void * data);
2490 static int sg_proc_hoststrs_info(char * buffer, int * len, off_t * begin,
2491 off_t offset, int size);
2492 static int sg_proc_version_read(char * buffer, char ** start, off_t offset,
2493 int size, int * eof, void * data);
2494 static int sg_proc_version_info(char * buffer, int * len, off_t * begin,
2495 off_t offset, int size);
2496 static read_proc_t * sg_proc_leaf_reads[] = {
2497 sg_proc_dressz_read, sg_proc_debug_read,
2498 sg_proc_dev_read, sg_proc_devhdr_read, sg_proc_devstrs_read,
2499 sg_proc_host_read, sg_proc_hosthdr_read, sg_proc_hoststrs_read,
2500 sg_proc_version_read};
2501 static write_proc_t * sg_proc_leaf_writes[] = {
2502 sg_proc_dressz_write, 0, 0, 0, 0, 0, 0, 0, 0};
2504 #define PRINT_PROC(fmt,args...) \
2506 *len += sprintf(buffer + *len, fmt, ##args); \
2507 if (*begin + *len > offset + size) \
2509 if (*begin + *len < offset) { \
2515 #define SG_PROC_READ_FN(infofp) \
2519 *eof = infofp(buffer, &len, &begin, offset, size); \
2520 if (offset >= (begin + len)) \
2522 *start = buffer + offset - begin; \
2523 return (size < (begin + len - offset)) ? \
2524 size : begin + len - offset; \
2528 static int sg_proc_init()
2531 int leaves = sizeof(sg_proc_leaf_names) / sizeof(sg_proc_leaf_names[0]);
2532 struct proc_dir_entry * pdep;
2536 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
2537 S_IFDIR | S_IRUGO | S_IXUGO, proc_scsi);
2540 for (k = 0; k < leaves; ++k) {
2541 mask = sg_proc_leaf_writes[k] ? S_IRUGO | S_IWUSR : S_IRUGO;
2542 pdep = create_proc_entry(sg_proc_leaf_names[k], mask, sg_proc_sgp);
2544 pdep->read_proc = sg_proc_leaf_reads[k];
2545 if (sg_proc_leaf_writes[k])
2546 pdep->write_proc = sg_proc_leaf_writes[k];
2552 static void sg_proc_cleanup()
2555 int leaves = sizeof(sg_proc_leaf_names) / sizeof(sg_proc_leaf_names[0]);
2557 if ((! proc_scsi) || (! sg_proc_sgp))
2559 for (k = 0; k < leaves; ++k)
2560 remove_proc_entry(sg_proc_leaf_names[k], sg_proc_sgp);
2561 remove_proc_entry(sg_proc_sg_dirname, proc_scsi);
2564 static int sg_proc_dressz_read(char * buffer, char ** start, off_t offset,
2565 int size, int * eof, void * data)
2566 { SG_PROC_READ_FN(sg_proc_dressz_info); }
2568 static int sg_proc_dressz_info(char * buffer, int * len, off_t * begin,
2569 off_t offset, int size)
2571 PRINT_PROC("%d\n", sg_big_buff);
2575 static int sg_proc_dressz_write(struct file * filp, const char * buffer,
2576 unsigned long count, void * data)
2579 unsigned long k = ULONG_MAX;
2582 if (! capable(CAP_SYS_ADMIN))
2584 num = (count < 10) ? count : 10;
2585 copy_from_user(buff, buffer, num);
2587 k = simple_strtoul(buff, 0, 10);
2595 static int sg_proc_debug_read(char * buffer, char ** start, off_t offset,
2596 int size, int * eof, void * data)
2597 { SG_PROC_READ_FN(sg_proc_debug_info); }
2599 static int sg_proc_debug_info(char * buffer, int * len, off_t * begin,
2600 off_t offset, int size)
2603 const sg_io_hdr_t * hp;
2606 if (NULL == sg_dev_arr) {
2607 PRINT_PROC("sg_dev_arr NULL, driver not initialized\n");
2610 max_dev = sg_last_dev();
2611 PRINT_PROC("dev_max(currently)=%d max_active_device=%d (origin 1)\n",
2612 sg_template.dev_max, max_dev);
2613 PRINT_PROC(" scsi_dma_free_sectors=%u sg_pool_secs_aval=%d "
2614 "def_reserved_size=%d\n",
2615 scsi_dma_free_sectors, sg_pool_secs_avail, sg_big_buff);
2616 for (j = 0; j < max_dev; ++j) {
2617 if ((sdp = sg_get_dev(j))) {
2620 struct scsi_device * scsidp;
2621 int dev, k, m, blen, usg;
2623 if (! (scsidp = sdp->device)) {
2624 PRINT_PROC("device %d detached ??\n", j);
2627 dev = MINOR(sdp->i_rdev);
2629 if (sg_get_nth_sfp(sdp, 0)) {
2630 PRINT_PROC(" >>> device=sg%d ", dev);
2631 PRINT_PROC("scsi%d chan=%d id=%d lun=%d em=%d sg_tablesize=%d"
2632 " excl=%d\n", scsidp->host->host_no, scsidp->channel,
2633 scsidp->id, scsidp->lun, scsidp->host->hostt->emulated,
2634 sdp->sg_tablesize, sdp->exclude);
2636 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2637 PRINT_PROC(" FD(%d): timeout=%dms bufflen=%d "
2638 "(res)sgat=%d low_dma=%d\n", k + 1,
2639 sg_jif_to_ms(fp->timeout), fp->reserve.bufflen,
2640 (int)fp->reserve.k_use_sg, (int)fp->low_dma);
2641 PRINT_PROC(" cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2642 (int)fp->cmd_q, (int)fp->force_packid,
2643 (int)fp->keep_orphan, (int)fp->closed);
2644 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2646 /* stop indenting so far ... */
2647 PRINT_PROC(srp->res_used ? " rb>> " :
2648 ((SG_INFO_DIRECT_IO_MASK & hp->info) ? " dio>> " : " "));
2649 blen = srp->my_cmdp ? srp->my_cmdp->sr_bufflen : srp->data.bufflen;
2650 usg = srp->my_cmdp ? srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
2651 PRINT_PROC(srp->done ? ((1 == srp->done) ? "rcv:" : "fin:")
2652 : (srp->my_cmdp ? "act:" : "prior:"));
2653 PRINT_PROC(" id=%d blen=%d", srp->header.pack_id, blen);
2655 PRINT_PROC(" dur=%d", hp->duration);
2657 PRINT_PROC(" t_o/elap=%d/%d", ((hp->interface_id == '\0') ?
2658 sg_jif_to_ms(fp->timeout) : hp->timeout),
2659 sg_jif_to_ms(hp->duration ? (jiffies - hp->duration) : 0));
2660 PRINT_PROC("ms sgat=%d op=0x%02x\n", usg, (int)srp->data.cmd_opcode);
2661 /* reset indenting */
2664 PRINT_PROC(" No requests active\n");
2671 static int sg_proc_dev_read(char * buffer, char ** start, off_t offset,
2672 int size, int * eof, void * data)
2673 { SG_PROC_READ_FN(sg_proc_dev_info); }
2675 static int sg_proc_dev_info(char * buffer, int * len, off_t * begin,
2676 off_t offset, int size)
2680 struct scsi_device * scsidp;
2682 max_dev = sg_last_dev();
2683 for (j = 0; j < max_dev; ++j) {
2684 sdp = sg_get_dev(j);
2685 if (sdp && (scsidp = sdp->device))
2686 PRINT_PROC("%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2687 scsidp->host->host_no, scsidp->channel, scsidp->id,
2688 scsidp->lun, (int)scsidp->type, (int)scsidp->access_count,
2689 (int)scsidp->queue_depth, (int)scsidp->device_busy);
2691 PRINT_PROC("-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2696 static int sg_proc_devhdr_read(char * buffer, char ** start, off_t offset,
2697 int size, int * eof, void * data)
2698 { SG_PROC_READ_FN(sg_proc_devhdr_info); }
2700 static int sg_proc_devhdr_info(char * buffer, int * len, off_t * begin,
2701 off_t offset, int size)
2703 PRINT_PROC("host\tchan\tid\tlun\ttype\tbopens\tqdepth\tbusy\n");
2707 static int sg_proc_devstrs_read(char * buffer, char ** start, off_t offset,
2708 int size, int * eof, void * data)
2709 { SG_PROC_READ_FN(sg_proc_devstrs_info); }
2711 static int sg_proc_devstrs_info(char * buffer, int * len, off_t * begin,
2712 off_t offset, int size)
2716 struct scsi_device * scsidp;
2718 max_dev = sg_last_dev();
2719 for (j = 0; j < max_dev; ++j) {
2720 sdp = sg_get_dev(j);
2721 if (sdp && (scsidp = sdp->device))
2722 PRINT_PROC("%8.8s\t%16.16s\t%4.4s\n",
2723 scsidp->vendor, scsidp->model, scsidp->rev);
2725 PRINT_PROC("<no active device>\n");
2730 static int sg_proc_host_read(char * buffer, char ** start, off_t offset,
2731 int size, int * eof, void * data)
2732 { SG_PROC_READ_FN(sg_proc_host_info); }
2734 static int sg_proc_host_info(char * buffer, int * len, off_t * begin,
2735 off_t offset, int size)
2737 struct Scsi_Host * shp;
2740 for (k = 0, shp = scsi_hostlist; shp; shp = shp->next, ++k) {
2741 for ( ; k < shp->host_no; ++k)
2742 PRINT_PROC("-1\t-1\t-1\t-1\t-1\t-1\n");
2743 PRINT_PROC("%u\t%hu\t%hd\t%hu\t%d\t%d\n",
2744 shp->unique_id, shp->host_busy, shp->cmd_per_lun,
2745 shp->sg_tablesize, (int)shp->unchecked_isa_dma,
2746 (int)shp->hostt->emulated);
2751 static int sg_proc_hosthdr_read(char * buffer, char ** start, off_t offset,
2752 int size, int * eof, void * data)
2753 { SG_PROC_READ_FN(sg_proc_hosthdr_info); }
2755 static int sg_proc_hosthdr_info(char * buffer, int * len, off_t * begin,
2756 off_t offset, int size)
2758 PRINT_PROC("uid\tbusy\tcpl\tscatg\tisa\temul\n");
2762 static int sg_proc_hoststrs_read(char * buffer, char ** start, off_t offset,
2763 int size, int * eof, void * data)
2764 { SG_PROC_READ_FN(sg_proc_hoststrs_info); }
2766 static int sg_proc_hoststrs_info(char * buffer, int * len, off_t * begin,
2767 off_t offset, int size)
2769 struct Scsi_Host * shp;
2772 for (k = 0, shp = scsi_hostlist; shp; shp = shp->next, ++k) {
2773 for ( ; k < shp->host_no; ++k)
2774 PRINT_PROC("<no active host>\n");
2775 PRINT_PROC("%s\n", shp->hostt->info ? shp->hostt->info(shp) :
2776 (shp->hostt->name ? shp->hostt->name : "<no name>"));
2781 static int sg_proc_version_read(char * buffer, char ** start, off_t offset,
2782 int size, int * eof, void * data)
2783 { SG_PROC_READ_FN(sg_proc_version_info); }
2785 static int sg_proc_version_info(char * buffer, int * len, off_t * begin,
2786 off_t offset, int size)
2788 PRINT_PROC("%d\t%s\n", sg_version_num, sg_version_str);
2791 #endif /* CONFIG_PROC_FS */
2794 module_init(init_sg);
2795 module_exit(exit_sg);