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Merge tag 'cleanup-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[mirror_ubuntu-artful-kernel.git] / drivers / scsi / sg.c
1 /*
2 * History:
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
6 *
7 * Original driver (sg.c):
8 * Copyright (C) 1992 Lawrence Foard
9 * Version 2 and 3 extensions to driver:
10 * Copyright (C) 1998 - 2014 Douglas Gilbert
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 */
18
19 static int sg_version_num = 30536; /* 2 digits for each component */
20 #define SG_VERSION_STR "3.5.36"
21
22 /*
23 * D. P. Gilbert (dgilbert@interlog.com), notes:
24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
26 * (otherwise the macros compile to empty statements).
27 *
28 */
29 #include <linux/module.h>
30
31 #include <linux/fs.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/string.h>
35 #include <linux/mm.h>
36 #include <linux/aio.h>
37 #include <linux/errno.h>
38 #include <linux/mtio.h>
39 #include <linux/ioctl.h>
40 #include <linux/slab.h>
41 #include <linux/fcntl.h>
42 #include <linux/init.h>
43 #include <linux/poll.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cdev.h>
46 #include <linux/idr.h>
47 #include <linux/seq_file.h>
48 #include <linux/blkdev.h>
49 #include <linux/delay.h>
50 #include <linux/blktrace_api.h>
51 #include <linux/mutex.h>
52 #include <linux/atomic.h>
53 #include <linux/ratelimit.h>
54
55 #include "scsi.h"
56 #include <scsi/scsi_dbg.h>
57 #include <scsi/scsi_host.h>
58 #include <scsi/scsi_driver.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/sg.h>
61
62 #include "scsi_logging.h"
63
64 #ifdef CONFIG_SCSI_PROC_FS
65 #include <linux/proc_fs.h>
66 static char *sg_version_date = "20140603";
67
68 static int sg_proc_init(void);
69 static void sg_proc_cleanup(void);
70 #endif
71
72 #define SG_ALLOW_DIO_DEF 0
73
74 #define SG_MAX_DEVS 32768
75
76 /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type
77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater
78 * than 16 bytes are "variable length" whose length is a multiple of 4
79 */
80 #define SG_MAX_CDB_SIZE 252
81
82 /*
83 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
84 * Then when using 32 bit integers x * m may overflow during the calculation.
85 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
86 * calculates the same, but prevents the overflow when both m and d
87 * are "small" numbers (like HZ and USER_HZ).
88 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
89 * in 32 bits.
90 */
91 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
92
93 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
94
95 int sg_big_buff = SG_DEF_RESERVED_SIZE;
96 /* N.B. This variable is readable and writeable via
97 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
98 of this size (or less if there is not enough memory) will be reserved
99 for use by this file descriptor. [Deprecated usage: this variable is also
100 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
101 the kernel (i.e. it is not a module).] */
102 static int def_reserved_size = -1; /* picks up init parameter */
103 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
104
105 static int scatter_elem_sz = SG_SCATTER_SZ;
106 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
107
108 #define SG_SECTOR_SZ 512
109
110 static int sg_add_device(struct device *, struct class_interface *);
111 static void sg_remove_device(struct device *, struct class_interface *);
112
113 static DEFINE_IDR(sg_index_idr);
114 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
115 file descriptor list for device */
116
117 static struct class_interface sg_interface = {
118 .add_dev = sg_add_device,
119 .remove_dev = sg_remove_device,
120 };
121
122 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
123 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
124 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
125 unsigned bufflen; /* Size of (aggregate) data buffer */
126 struct page **pages;
127 int page_order;
128 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
129 unsigned char cmd_opcode; /* first byte of command */
130 } Sg_scatter_hold;
131
132 struct sg_device; /* forward declarations */
133 struct sg_fd;
134
135 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
136 struct sg_request *nextrp; /* NULL -> tail request (slist) */
137 struct sg_fd *parentfp; /* NULL -> not in use */
138 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
139 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
140 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
141 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
142 char orphan; /* 1 -> drop on sight, 0 -> normal */
143 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
144 /* done protected by rq_list_lock */
145 char done; /* 0->before bh, 1->before read, 2->read */
146 struct request *rq;
147 struct bio *bio;
148 struct execute_work ew;
149 } Sg_request;
150
151 typedef struct sg_fd { /* holds the state of a file descriptor */
152 struct list_head sfd_siblings; /* protected by device's sfd_lock */
153 struct sg_device *parentdp; /* owning device */
154 wait_queue_head_t read_wait; /* queue read until command done */
155 rwlock_t rq_list_lock; /* protect access to list in req_arr */
156 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
157 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
158 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
159 unsigned save_scat_len; /* original length of trunc. scat. element */
160 Sg_request *headrp; /* head of request slist, NULL->empty */
161 struct fasync_struct *async_qp; /* used by asynchronous notification */
162 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
163 char low_dma; /* as in parent but possibly overridden to 1 */
164 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
165 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
166 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
167 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
168 char mmap_called; /* 0 -> mmap() never called on this fd */
169 struct kref f_ref;
170 struct execute_work ew;
171 } Sg_fd;
172
173 typedef struct sg_device { /* holds the state of each scsi generic device */
174 struct scsi_device *device;
175 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
176 struct mutex open_rel_lock; /* held when in open() or release() */
177 int sg_tablesize; /* adapter's max scatter-gather table size */
178 u32 index; /* device index number */
179 struct list_head sfds;
180 rwlock_t sfd_lock; /* protect access to sfd list */
181 atomic_t detaching; /* 0->device usable, 1->device detaching */
182 bool exclude; /* 1->open(O_EXCL) succeeded and is active */
183 int open_cnt; /* count of opens (perhaps < num(sfds) ) */
184 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
185 struct gendisk *disk;
186 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
187 struct kref d_ref;
188 } Sg_device;
189
190 /* tasklet or soft irq callback */
191 static void sg_rq_end_io(struct request *rq, int uptodate);
192 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
193 static int sg_finish_rem_req(Sg_request * srp);
194 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
195 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
196 Sg_request * srp);
197 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
198 const char __user *buf, size_t count, int blocking,
199 int read_only, int sg_io_owned, Sg_request **o_srp);
200 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
201 unsigned char *cmnd, int timeout, int blocking);
202 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
203 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
204 static void sg_build_reserve(Sg_fd * sfp, int req_size);
205 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
206 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
207 static Sg_fd *sg_add_sfp(Sg_device * sdp);
208 static void sg_remove_sfp(struct kref *);
209 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
210 static Sg_request *sg_add_request(Sg_fd * sfp);
211 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
212 static int sg_res_in_use(Sg_fd * sfp);
213 static Sg_device *sg_get_dev(int dev);
214 static void sg_device_destroy(struct kref *kref);
215
216 #define SZ_SG_HEADER sizeof(struct sg_header)
217 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
218 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
219 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
220
221 #define sg_printk(prefix, sdp, fmt, a...) \
222 sdev_printk(prefix, (sdp)->device, "[%s] " fmt, \
223 (sdp)->disk->disk_name, ##a)
224
225 static int sg_allow_access(struct file *filp, unsigned char *cmd)
226 {
227 struct sg_fd *sfp = filp->private_data;
228
229 if (sfp->parentdp->device->type == TYPE_SCANNER)
230 return 0;
231
232 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
233 }
234
235 static int
236 open_wait(Sg_device *sdp, int flags)
237 {
238 int retval = 0;
239
240 if (flags & O_EXCL) {
241 while (sdp->open_cnt > 0) {
242 mutex_unlock(&sdp->open_rel_lock);
243 retval = wait_event_interruptible(sdp->open_wait,
244 (atomic_read(&sdp->detaching) ||
245 !sdp->open_cnt));
246 mutex_lock(&sdp->open_rel_lock);
247
248 if (retval) /* -ERESTARTSYS */
249 return retval;
250 if (atomic_read(&sdp->detaching))
251 return -ENODEV;
252 }
253 } else {
254 while (sdp->exclude) {
255 mutex_unlock(&sdp->open_rel_lock);
256 retval = wait_event_interruptible(sdp->open_wait,
257 (atomic_read(&sdp->detaching) ||
258 !sdp->exclude));
259 mutex_lock(&sdp->open_rel_lock);
260
261 if (retval) /* -ERESTARTSYS */
262 return retval;
263 if (atomic_read(&sdp->detaching))
264 return -ENODEV;
265 }
266 }
267
268 return retval;
269 }
270
271 /* Returns 0 on success, else a negated errno value */
272 static int
273 sg_open(struct inode *inode, struct file *filp)
274 {
275 int dev = iminor(inode);
276 int flags = filp->f_flags;
277 struct request_queue *q;
278 Sg_device *sdp;
279 Sg_fd *sfp;
280 int retval;
281
282 nonseekable_open(inode, filp);
283 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
284 return -EPERM; /* Can't lock it with read only access */
285 sdp = sg_get_dev(dev);
286 if (IS_ERR(sdp))
287 return PTR_ERR(sdp);
288
289 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
290 "sg_open: flags=0x%x\n", flags));
291
292 /* This driver's module count bumped by fops_get in <linux/fs.h> */
293 /* Prevent the device driver from vanishing while we sleep */
294 retval = scsi_device_get(sdp->device);
295 if (retval)
296 goto sg_put;
297
298 retval = scsi_autopm_get_device(sdp->device);
299 if (retval)
300 goto sdp_put;
301
302 /* scsi_block_when_processing_errors() may block so bypass
303 * check if O_NONBLOCK. Permits SCSI commands to be issued
304 * during error recovery. Tread carefully. */
305 if (!((flags & O_NONBLOCK) ||
306 scsi_block_when_processing_errors(sdp->device))) {
307 retval = -ENXIO;
308 /* we are in error recovery for this device */
309 goto error_out;
310 }
311
312 mutex_lock(&sdp->open_rel_lock);
313 if (flags & O_NONBLOCK) {
314 if (flags & O_EXCL) {
315 if (sdp->open_cnt > 0) {
316 retval = -EBUSY;
317 goto error_mutex_locked;
318 }
319 } else {
320 if (sdp->exclude) {
321 retval = -EBUSY;
322 goto error_mutex_locked;
323 }
324 }
325 } else {
326 retval = open_wait(sdp, flags);
327 if (retval) /* -ERESTARTSYS or -ENODEV */
328 goto error_mutex_locked;
329 }
330
331 /* N.B. at this point we are holding the open_rel_lock */
332 if (flags & O_EXCL)
333 sdp->exclude = true;
334
335 if (sdp->open_cnt < 1) { /* no existing opens */
336 sdp->sgdebug = 0;
337 q = sdp->device->request_queue;
338 sdp->sg_tablesize = queue_max_segments(q);
339 }
340 sfp = sg_add_sfp(sdp);
341 if (IS_ERR(sfp)) {
342 retval = PTR_ERR(sfp);
343 goto out_undo;
344 }
345
346 filp->private_data = sfp;
347 sdp->open_cnt++;
348 mutex_unlock(&sdp->open_rel_lock);
349
350 retval = 0;
351 sg_put:
352 kref_put(&sdp->d_ref, sg_device_destroy);
353 return retval;
354
355 out_undo:
356 if (flags & O_EXCL) {
357 sdp->exclude = false; /* undo if error */
358 wake_up_interruptible(&sdp->open_wait);
359 }
360 error_mutex_locked:
361 mutex_unlock(&sdp->open_rel_lock);
362 error_out:
363 scsi_autopm_put_device(sdp->device);
364 sdp_put:
365 scsi_device_put(sdp->device);
366 goto sg_put;
367 }
368
369 /* Release resources associated with a successful sg_open()
370 * Returns 0 on success, else a negated errno value */
371 static int
372 sg_release(struct inode *inode, struct file *filp)
373 {
374 Sg_device *sdp;
375 Sg_fd *sfp;
376
377 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
378 return -ENXIO;
379 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
380
381 mutex_lock(&sdp->open_rel_lock);
382 scsi_autopm_put_device(sdp->device);
383 kref_put(&sfp->f_ref, sg_remove_sfp);
384 sdp->open_cnt--;
385
386 /* possibly many open()s waiting on exlude clearing, start many;
387 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
388 if (sdp->exclude) {
389 sdp->exclude = false;
390 wake_up_interruptible_all(&sdp->open_wait);
391 } else if (0 == sdp->open_cnt) {
392 wake_up_interruptible(&sdp->open_wait);
393 }
394 mutex_unlock(&sdp->open_rel_lock);
395 return 0;
396 }
397
398 static ssize_t
399 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
400 {
401 Sg_device *sdp;
402 Sg_fd *sfp;
403 Sg_request *srp;
404 int req_pack_id = -1;
405 sg_io_hdr_t *hp;
406 struct sg_header *old_hdr = NULL;
407 int retval = 0;
408
409 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
410 return -ENXIO;
411 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
412 "sg_read: count=%d\n", (int) count));
413
414 if (!access_ok(VERIFY_WRITE, buf, count))
415 return -EFAULT;
416 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
417 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
418 if (!old_hdr)
419 return -ENOMEM;
420 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
421 retval = -EFAULT;
422 goto free_old_hdr;
423 }
424 if (old_hdr->reply_len < 0) {
425 if (count >= SZ_SG_IO_HDR) {
426 sg_io_hdr_t *new_hdr;
427 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
428 if (!new_hdr) {
429 retval = -ENOMEM;
430 goto free_old_hdr;
431 }
432 retval =__copy_from_user
433 (new_hdr, buf, SZ_SG_IO_HDR);
434 req_pack_id = new_hdr->pack_id;
435 kfree(new_hdr);
436 if (retval) {
437 retval = -EFAULT;
438 goto free_old_hdr;
439 }
440 }
441 } else
442 req_pack_id = old_hdr->pack_id;
443 }
444 srp = sg_get_rq_mark(sfp, req_pack_id);
445 if (!srp) { /* now wait on packet to arrive */
446 if (atomic_read(&sdp->detaching)) {
447 retval = -ENODEV;
448 goto free_old_hdr;
449 }
450 if (filp->f_flags & O_NONBLOCK) {
451 retval = -EAGAIN;
452 goto free_old_hdr;
453 }
454 retval = wait_event_interruptible(sfp->read_wait,
455 (atomic_read(&sdp->detaching) ||
456 (srp = sg_get_rq_mark(sfp, req_pack_id))));
457 if (atomic_read(&sdp->detaching)) {
458 retval = -ENODEV;
459 goto free_old_hdr;
460 }
461 if (retval) {
462 /* -ERESTARTSYS as signal hit process */
463 goto free_old_hdr;
464 }
465 }
466 if (srp->header.interface_id != '\0') {
467 retval = sg_new_read(sfp, buf, count, srp);
468 goto free_old_hdr;
469 }
470
471 hp = &srp->header;
472 if (old_hdr == NULL) {
473 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
474 if (! old_hdr) {
475 retval = -ENOMEM;
476 goto free_old_hdr;
477 }
478 }
479 memset(old_hdr, 0, SZ_SG_HEADER);
480 old_hdr->reply_len = (int) hp->timeout;
481 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
482 old_hdr->pack_id = hp->pack_id;
483 old_hdr->twelve_byte =
484 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
485 old_hdr->target_status = hp->masked_status;
486 old_hdr->host_status = hp->host_status;
487 old_hdr->driver_status = hp->driver_status;
488 if ((CHECK_CONDITION & hp->masked_status) ||
489 (DRIVER_SENSE & hp->driver_status))
490 memcpy(old_hdr->sense_buffer, srp->sense_b,
491 sizeof (old_hdr->sense_buffer));
492 switch (hp->host_status) {
493 /* This setup of 'result' is for backward compatibility and is best
494 ignored by the user who should use target, host + driver status */
495 case DID_OK:
496 case DID_PASSTHROUGH:
497 case DID_SOFT_ERROR:
498 old_hdr->result = 0;
499 break;
500 case DID_NO_CONNECT:
501 case DID_BUS_BUSY:
502 case DID_TIME_OUT:
503 old_hdr->result = EBUSY;
504 break;
505 case DID_BAD_TARGET:
506 case DID_ABORT:
507 case DID_PARITY:
508 case DID_RESET:
509 case DID_BAD_INTR:
510 old_hdr->result = EIO;
511 break;
512 case DID_ERROR:
513 old_hdr->result = (srp->sense_b[0] == 0 &&
514 hp->masked_status == GOOD) ? 0 : EIO;
515 break;
516 default:
517 old_hdr->result = EIO;
518 break;
519 }
520
521 /* Now copy the result back to the user buffer. */
522 if (count >= SZ_SG_HEADER) {
523 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
524 retval = -EFAULT;
525 goto free_old_hdr;
526 }
527 buf += SZ_SG_HEADER;
528 if (count > old_hdr->reply_len)
529 count = old_hdr->reply_len;
530 if (count > SZ_SG_HEADER) {
531 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
532 retval = -EFAULT;
533 goto free_old_hdr;
534 }
535 }
536 } else
537 count = (old_hdr->result == 0) ? 0 : -EIO;
538 sg_finish_rem_req(srp);
539 retval = count;
540 free_old_hdr:
541 kfree(old_hdr);
542 return retval;
543 }
544
545 static ssize_t
546 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
547 {
548 sg_io_hdr_t *hp = &srp->header;
549 int err = 0;
550 int len;
551
552 if (count < SZ_SG_IO_HDR) {
553 err = -EINVAL;
554 goto err_out;
555 }
556 hp->sb_len_wr = 0;
557 if ((hp->mx_sb_len > 0) && hp->sbp) {
558 if ((CHECK_CONDITION & hp->masked_status) ||
559 (DRIVER_SENSE & hp->driver_status)) {
560 int sb_len = SCSI_SENSE_BUFFERSIZE;
561 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
562 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
563 len = (len > sb_len) ? sb_len : len;
564 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
565 err = -EFAULT;
566 goto err_out;
567 }
568 hp->sb_len_wr = len;
569 }
570 }
571 if (hp->masked_status || hp->host_status || hp->driver_status)
572 hp->info |= SG_INFO_CHECK;
573 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
574 err = -EFAULT;
575 goto err_out;
576 }
577 err_out:
578 err = sg_finish_rem_req(srp);
579 return (0 == err) ? count : err;
580 }
581
582 static ssize_t
583 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
584 {
585 int mxsize, cmd_size, k;
586 int input_size, blocking;
587 unsigned char opcode;
588 Sg_device *sdp;
589 Sg_fd *sfp;
590 Sg_request *srp;
591 struct sg_header old_hdr;
592 sg_io_hdr_t *hp;
593 unsigned char cmnd[SG_MAX_CDB_SIZE];
594
595 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
596 return -ENXIO;
597 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
598 "sg_write: count=%d\n", (int) count));
599 if (atomic_read(&sdp->detaching))
600 return -ENODEV;
601 if (!((filp->f_flags & O_NONBLOCK) ||
602 scsi_block_when_processing_errors(sdp->device)))
603 return -ENXIO;
604
605 if (!access_ok(VERIFY_READ, buf, count))
606 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
607 if (count < SZ_SG_HEADER)
608 return -EIO;
609 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
610 return -EFAULT;
611 blocking = !(filp->f_flags & O_NONBLOCK);
612 if (old_hdr.reply_len < 0)
613 return sg_new_write(sfp, filp, buf, count,
614 blocking, 0, 0, NULL);
615 if (count < (SZ_SG_HEADER + 6))
616 return -EIO; /* The minimum scsi command length is 6 bytes. */
617
618 if (!(srp = sg_add_request(sfp))) {
619 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
620 "sg_write: queue full\n"));
621 return -EDOM;
622 }
623 buf += SZ_SG_HEADER;
624 __get_user(opcode, buf);
625 if (sfp->next_cmd_len > 0) {
626 cmd_size = sfp->next_cmd_len;
627 sfp->next_cmd_len = 0; /* reset so only this write() effected */
628 } else {
629 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
630 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
631 cmd_size = 12;
632 }
633 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
634 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
635 /* Determine buffer size. */
636 input_size = count - cmd_size;
637 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
638 mxsize -= SZ_SG_HEADER;
639 input_size -= SZ_SG_HEADER;
640 if (input_size < 0) {
641 sg_remove_request(sfp, srp);
642 return -EIO; /* User did not pass enough bytes for this command. */
643 }
644 hp = &srp->header;
645 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
646 hp->cmd_len = (unsigned char) cmd_size;
647 hp->iovec_count = 0;
648 hp->mx_sb_len = 0;
649 if (input_size > 0)
650 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
651 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
652 else
653 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
654 hp->dxfer_len = mxsize;
655 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
656 hp->dxferp = (char __user *)buf + cmd_size;
657 else
658 hp->dxferp = NULL;
659 hp->sbp = NULL;
660 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
661 hp->flags = input_size; /* structure abuse ... */
662 hp->pack_id = old_hdr.pack_id;
663 hp->usr_ptr = NULL;
664 if (__copy_from_user(cmnd, buf, cmd_size))
665 return -EFAULT;
666 /*
667 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
668 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
669 * is a non-zero input_size, so emit a warning.
670 */
671 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
672 static char cmd[TASK_COMM_LEN];
673 if (strcmp(current->comm, cmd)) {
674 printk_ratelimited(KERN_WARNING
675 "sg_write: data in/out %d/%d bytes "
676 "for SCSI command 0x%x-- guessing "
677 "data in;\n program %s not setting "
678 "count and/or reply_len properly\n",
679 old_hdr.reply_len - (int)SZ_SG_HEADER,
680 input_size, (unsigned int) cmnd[0],
681 current->comm);
682 strcpy(cmd, current->comm);
683 }
684 }
685 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
686 return (k < 0) ? k : count;
687 }
688
689 static ssize_t
690 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
691 size_t count, int blocking, int read_only, int sg_io_owned,
692 Sg_request **o_srp)
693 {
694 int k;
695 Sg_request *srp;
696 sg_io_hdr_t *hp;
697 unsigned char cmnd[SG_MAX_CDB_SIZE];
698 int timeout;
699 unsigned long ul_timeout;
700
701 if (count < SZ_SG_IO_HDR)
702 return -EINVAL;
703 if (!access_ok(VERIFY_READ, buf, count))
704 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
705
706 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
707 if (!(srp = sg_add_request(sfp))) {
708 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
709 "sg_new_write: queue full\n"));
710 return -EDOM;
711 }
712 srp->sg_io_owned = sg_io_owned;
713 hp = &srp->header;
714 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
715 sg_remove_request(sfp, srp);
716 return -EFAULT;
717 }
718 if (hp->interface_id != 'S') {
719 sg_remove_request(sfp, srp);
720 return -ENOSYS;
721 }
722 if (hp->flags & SG_FLAG_MMAP_IO) {
723 if (hp->dxfer_len > sfp->reserve.bufflen) {
724 sg_remove_request(sfp, srp);
725 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
726 }
727 if (hp->flags & SG_FLAG_DIRECT_IO) {
728 sg_remove_request(sfp, srp);
729 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
730 }
731 if (sg_res_in_use(sfp)) {
732 sg_remove_request(sfp, srp);
733 return -EBUSY; /* reserve buffer already being used */
734 }
735 }
736 ul_timeout = msecs_to_jiffies(srp->header.timeout);
737 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
738 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
739 sg_remove_request(sfp, srp);
740 return -EMSGSIZE;
741 }
742 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
743 sg_remove_request(sfp, srp);
744 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
745 }
746 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
747 sg_remove_request(sfp, srp);
748 return -EFAULT;
749 }
750 if (read_only && sg_allow_access(file, cmnd)) {
751 sg_remove_request(sfp, srp);
752 return -EPERM;
753 }
754 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
755 if (k < 0)
756 return k;
757 if (o_srp)
758 *o_srp = srp;
759 return count;
760 }
761
762 static int
763 sg_common_write(Sg_fd * sfp, Sg_request * srp,
764 unsigned char *cmnd, int timeout, int blocking)
765 {
766 int k, data_dir, at_head;
767 Sg_device *sdp = sfp->parentdp;
768 sg_io_hdr_t *hp = &srp->header;
769
770 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
771 hp->status = 0;
772 hp->masked_status = 0;
773 hp->msg_status = 0;
774 hp->info = 0;
775 hp->host_status = 0;
776 hp->driver_status = 0;
777 hp->resid = 0;
778 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
779 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
780 (int) cmnd[0], (int) hp->cmd_len));
781
782 k = sg_start_req(srp, cmnd);
783 if (k) {
784 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
785 "sg_common_write: start_req err=%d\n", k));
786 sg_finish_rem_req(srp);
787 return k; /* probably out of space --> ENOMEM */
788 }
789 if (atomic_read(&sdp->detaching)) {
790 if (srp->bio)
791 blk_end_request_all(srp->rq, -EIO);
792 sg_finish_rem_req(srp);
793 return -ENODEV;
794 }
795
796 switch (hp->dxfer_direction) {
797 case SG_DXFER_TO_FROM_DEV:
798 case SG_DXFER_FROM_DEV:
799 data_dir = DMA_FROM_DEVICE;
800 break;
801 case SG_DXFER_TO_DEV:
802 data_dir = DMA_TO_DEVICE;
803 break;
804 case SG_DXFER_UNKNOWN:
805 data_dir = DMA_BIDIRECTIONAL;
806 break;
807 default:
808 data_dir = DMA_NONE;
809 break;
810 }
811 hp->duration = jiffies_to_msecs(jiffies);
812 if (hp->interface_id != '\0' && /* v3 (or later) interface */
813 (SG_FLAG_Q_AT_TAIL & hp->flags))
814 at_head = 0;
815 else
816 at_head = 1;
817
818 srp->rq->timeout = timeout;
819 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
820 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
821 srp->rq, at_head, sg_rq_end_io);
822 return 0;
823 }
824
825 static int srp_done(Sg_fd *sfp, Sg_request *srp)
826 {
827 unsigned long flags;
828 int ret;
829
830 read_lock_irqsave(&sfp->rq_list_lock, flags);
831 ret = srp->done;
832 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
833 return ret;
834 }
835
836 static int max_sectors_bytes(struct request_queue *q)
837 {
838 unsigned int max_sectors = queue_max_sectors(q);
839
840 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
841
842 return max_sectors << 9;
843 }
844
845 static long
846 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
847 {
848 void __user *p = (void __user *)arg;
849 int __user *ip = p;
850 int result, val, read_only;
851 Sg_device *sdp;
852 Sg_fd *sfp;
853 Sg_request *srp;
854 unsigned long iflags;
855
856 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
857 return -ENXIO;
858
859 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
860 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
861 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
862
863 switch (cmd_in) {
864 case SG_IO:
865 if (atomic_read(&sdp->detaching))
866 return -ENODEV;
867 if (!scsi_block_when_processing_errors(sdp->device))
868 return -ENXIO;
869 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
870 return -EFAULT;
871 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
872 1, read_only, 1, &srp);
873 if (result < 0)
874 return result;
875 result = wait_event_interruptible(sfp->read_wait,
876 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
877 if (atomic_read(&sdp->detaching))
878 return -ENODEV;
879 write_lock_irq(&sfp->rq_list_lock);
880 if (srp->done) {
881 srp->done = 2;
882 write_unlock_irq(&sfp->rq_list_lock);
883 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
884 return (result < 0) ? result : 0;
885 }
886 srp->orphan = 1;
887 write_unlock_irq(&sfp->rq_list_lock);
888 return result; /* -ERESTARTSYS because signal hit process */
889 case SG_SET_TIMEOUT:
890 result = get_user(val, ip);
891 if (result)
892 return result;
893 if (val < 0)
894 return -EIO;
895 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
896 val = MULDIV (INT_MAX, USER_HZ, HZ);
897 sfp->timeout_user = val;
898 sfp->timeout = MULDIV (val, HZ, USER_HZ);
899
900 return 0;
901 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
902 /* strange ..., for backward compatibility */
903 return sfp->timeout_user;
904 case SG_SET_FORCE_LOW_DMA:
905 result = get_user(val, ip);
906 if (result)
907 return result;
908 if (val) {
909 sfp->low_dma = 1;
910 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
911 val = (int) sfp->reserve.bufflen;
912 sg_remove_scat(sfp, &sfp->reserve);
913 sg_build_reserve(sfp, val);
914 }
915 } else {
916 if (atomic_read(&sdp->detaching))
917 return -ENODEV;
918 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
919 }
920 return 0;
921 case SG_GET_LOW_DMA:
922 return put_user((int) sfp->low_dma, ip);
923 case SG_GET_SCSI_ID:
924 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
925 return -EFAULT;
926 else {
927 sg_scsi_id_t __user *sg_idp = p;
928
929 if (atomic_read(&sdp->detaching))
930 return -ENODEV;
931 __put_user((int) sdp->device->host->host_no,
932 &sg_idp->host_no);
933 __put_user((int) sdp->device->channel,
934 &sg_idp->channel);
935 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
936 __put_user((int) sdp->device->lun, &sg_idp->lun);
937 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
938 __put_user((short) sdp->device->host->cmd_per_lun,
939 &sg_idp->h_cmd_per_lun);
940 __put_user((short) sdp->device->queue_depth,
941 &sg_idp->d_queue_depth);
942 __put_user(0, &sg_idp->unused[0]);
943 __put_user(0, &sg_idp->unused[1]);
944 return 0;
945 }
946 case SG_SET_FORCE_PACK_ID:
947 result = get_user(val, ip);
948 if (result)
949 return result;
950 sfp->force_packid = val ? 1 : 0;
951 return 0;
952 case SG_GET_PACK_ID:
953 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
954 return -EFAULT;
955 read_lock_irqsave(&sfp->rq_list_lock, iflags);
956 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
957 if ((1 == srp->done) && (!srp->sg_io_owned)) {
958 read_unlock_irqrestore(&sfp->rq_list_lock,
959 iflags);
960 __put_user(srp->header.pack_id, ip);
961 return 0;
962 }
963 }
964 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
965 __put_user(-1, ip);
966 return 0;
967 case SG_GET_NUM_WAITING:
968 read_lock_irqsave(&sfp->rq_list_lock, iflags);
969 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
970 if ((1 == srp->done) && (!srp->sg_io_owned))
971 ++val;
972 }
973 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
974 return put_user(val, ip);
975 case SG_GET_SG_TABLESIZE:
976 return put_user(sdp->sg_tablesize, ip);
977 case SG_SET_RESERVED_SIZE:
978 result = get_user(val, ip);
979 if (result)
980 return result;
981 if (val < 0)
982 return -EINVAL;
983 val = min_t(int, val,
984 max_sectors_bytes(sdp->device->request_queue));
985 if (val != sfp->reserve.bufflen) {
986 if (sg_res_in_use(sfp) || sfp->mmap_called)
987 return -EBUSY;
988 sg_remove_scat(sfp, &sfp->reserve);
989 sg_build_reserve(sfp, val);
990 }
991 return 0;
992 case SG_GET_RESERVED_SIZE:
993 val = min_t(int, sfp->reserve.bufflen,
994 max_sectors_bytes(sdp->device->request_queue));
995 return put_user(val, ip);
996 case SG_SET_COMMAND_Q:
997 result = get_user(val, ip);
998 if (result)
999 return result;
1000 sfp->cmd_q = val ? 1 : 0;
1001 return 0;
1002 case SG_GET_COMMAND_Q:
1003 return put_user((int) sfp->cmd_q, ip);
1004 case SG_SET_KEEP_ORPHAN:
1005 result = get_user(val, ip);
1006 if (result)
1007 return result;
1008 sfp->keep_orphan = val;
1009 return 0;
1010 case SG_GET_KEEP_ORPHAN:
1011 return put_user((int) sfp->keep_orphan, ip);
1012 case SG_NEXT_CMD_LEN:
1013 result = get_user(val, ip);
1014 if (result)
1015 return result;
1016 sfp->next_cmd_len = (val > 0) ? val : 0;
1017 return 0;
1018 case SG_GET_VERSION_NUM:
1019 return put_user(sg_version_num, ip);
1020 case SG_GET_ACCESS_COUNT:
1021 /* faked - we don't have a real access count anymore */
1022 val = (sdp->device ? 1 : 0);
1023 return put_user(val, ip);
1024 case SG_GET_REQUEST_TABLE:
1025 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1026 return -EFAULT;
1027 else {
1028 sg_req_info_t *rinfo;
1029 unsigned int ms;
1030
1031 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1032 GFP_KERNEL);
1033 if (!rinfo)
1034 return -ENOMEM;
1035 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1036 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1037 ++val, srp = srp ? srp->nextrp : srp) {
1038 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1039 if (srp) {
1040 rinfo[val].req_state = srp->done + 1;
1041 rinfo[val].problem =
1042 srp->header.masked_status &
1043 srp->header.host_status &
1044 srp->header.driver_status;
1045 if (srp->done)
1046 rinfo[val].duration =
1047 srp->header.duration;
1048 else {
1049 ms = jiffies_to_msecs(jiffies);
1050 rinfo[val].duration =
1051 (ms > srp->header.duration) ?
1052 (ms - srp->header.duration) : 0;
1053 }
1054 rinfo[val].orphan = srp->orphan;
1055 rinfo[val].sg_io_owned =
1056 srp->sg_io_owned;
1057 rinfo[val].pack_id =
1058 srp->header.pack_id;
1059 rinfo[val].usr_ptr =
1060 srp->header.usr_ptr;
1061 }
1062 }
1063 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1064 result = __copy_to_user(p, rinfo,
1065 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1066 result = result ? -EFAULT : 0;
1067 kfree(rinfo);
1068 return result;
1069 }
1070 case SG_EMULATED_HOST:
1071 if (atomic_read(&sdp->detaching))
1072 return -ENODEV;
1073 return put_user(sdp->device->host->hostt->emulated, ip);
1074 case SG_SCSI_RESET:
1075 if (atomic_read(&sdp->detaching))
1076 return -ENODEV;
1077 if (filp->f_flags & O_NONBLOCK) {
1078 if (scsi_host_in_recovery(sdp->device->host))
1079 return -EBUSY;
1080 } else if (!scsi_block_when_processing_errors(sdp->device))
1081 return -EBUSY;
1082 result = get_user(val, ip);
1083 if (result)
1084 return result;
1085 if (SG_SCSI_RESET_NOTHING == val)
1086 return 0;
1087 switch (val) {
1088 case SG_SCSI_RESET_DEVICE:
1089 val = SCSI_TRY_RESET_DEVICE;
1090 break;
1091 case SG_SCSI_RESET_TARGET:
1092 val = SCSI_TRY_RESET_TARGET;
1093 break;
1094 case SG_SCSI_RESET_BUS:
1095 val = SCSI_TRY_RESET_BUS;
1096 break;
1097 case SG_SCSI_RESET_HOST:
1098 val = SCSI_TRY_RESET_HOST;
1099 break;
1100 default:
1101 return -EINVAL;
1102 }
1103 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1104 return -EACCES;
1105 return (scsi_reset_provider(sdp->device, val) ==
1106 SUCCESS) ? 0 : -EIO;
1107 case SCSI_IOCTL_SEND_COMMAND:
1108 if (atomic_read(&sdp->detaching))
1109 return -ENODEV;
1110 if (read_only) {
1111 unsigned char opcode = WRITE_6;
1112 Scsi_Ioctl_Command __user *siocp = p;
1113
1114 if (copy_from_user(&opcode, siocp->data, 1))
1115 return -EFAULT;
1116 if (sg_allow_access(filp, &opcode))
1117 return -EPERM;
1118 }
1119 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1120 case SG_SET_DEBUG:
1121 result = get_user(val, ip);
1122 if (result)
1123 return result;
1124 sdp->sgdebug = (char) val;
1125 return 0;
1126 case SCSI_IOCTL_GET_IDLUN:
1127 case SCSI_IOCTL_GET_BUS_NUMBER:
1128 case SCSI_IOCTL_PROBE_HOST:
1129 case SG_GET_TRANSFORM:
1130 if (atomic_read(&sdp->detaching))
1131 return -ENODEV;
1132 return scsi_ioctl(sdp->device, cmd_in, p);
1133 case BLKSECTGET:
1134 return put_user(max_sectors_bytes(sdp->device->request_queue),
1135 ip);
1136 case BLKTRACESETUP:
1137 return blk_trace_setup(sdp->device->request_queue,
1138 sdp->disk->disk_name,
1139 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1140 NULL,
1141 (char *)arg);
1142 case BLKTRACESTART:
1143 return blk_trace_startstop(sdp->device->request_queue, 1);
1144 case BLKTRACESTOP:
1145 return blk_trace_startstop(sdp->device->request_queue, 0);
1146 case BLKTRACETEARDOWN:
1147 return blk_trace_remove(sdp->device->request_queue);
1148 default:
1149 if (read_only)
1150 return -EPERM; /* don't know so take safe approach */
1151 return scsi_ioctl(sdp->device, cmd_in, p);
1152 }
1153 }
1154
1155 #ifdef CONFIG_COMPAT
1156 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1157 {
1158 Sg_device *sdp;
1159 Sg_fd *sfp;
1160 struct scsi_device *sdev;
1161
1162 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1163 return -ENXIO;
1164
1165 sdev = sdp->device;
1166 if (sdev->host->hostt->compat_ioctl) {
1167 int ret;
1168
1169 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1170
1171 return ret;
1172 }
1173
1174 return -ENOIOCTLCMD;
1175 }
1176 #endif
1177
1178 static unsigned int
1179 sg_poll(struct file *filp, poll_table * wait)
1180 {
1181 unsigned int res = 0;
1182 Sg_device *sdp;
1183 Sg_fd *sfp;
1184 Sg_request *srp;
1185 int count = 0;
1186 unsigned long iflags;
1187
1188 sfp = filp->private_data;
1189 if (!sfp)
1190 return POLLERR;
1191 sdp = sfp->parentdp;
1192 if (!sdp)
1193 return POLLERR;
1194 poll_wait(filp, &sfp->read_wait, wait);
1195 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1196 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1197 /* if any read waiting, flag it */
1198 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1199 res = POLLIN | POLLRDNORM;
1200 ++count;
1201 }
1202 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1203
1204 if (atomic_read(&sdp->detaching))
1205 res |= POLLHUP;
1206 else if (!sfp->cmd_q) {
1207 if (0 == count)
1208 res |= POLLOUT | POLLWRNORM;
1209 } else if (count < SG_MAX_QUEUE)
1210 res |= POLLOUT | POLLWRNORM;
1211 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1212 "sg_poll: res=0x%x\n", (int) res));
1213 return res;
1214 }
1215
1216 static int
1217 sg_fasync(int fd, struct file *filp, int mode)
1218 {
1219 Sg_device *sdp;
1220 Sg_fd *sfp;
1221
1222 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1223 return -ENXIO;
1224 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1225 "sg_fasync: mode=%d\n", mode));
1226
1227 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1228 }
1229
1230 static int
1231 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1232 {
1233 Sg_fd *sfp;
1234 unsigned long offset, len, sa;
1235 Sg_scatter_hold *rsv_schp;
1236 int k, length;
1237
1238 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1239 return VM_FAULT_SIGBUS;
1240 rsv_schp = &sfp->reserve;
1241 offset = vmf->pgoff << PAGE_SHIFT;
1242 if (offset >= rsv_schp->bufflen)
1243 return VM_FAULT_SIGBUS;
1244 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1245 "sg_vma_fault: offset=%lu, scatg=%d\n",
1246 offset, rsv_schp->k_use_sg));
1247 sa = vma->vm_start;
1248 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1249 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1250 len = vma->vm_end - sa;
1251 len = (len < length) ? len : length;
1252 if (offset < len) {
1253 struct page *page = nth_page(rsv_schp->pages[k],
1254 offset >> PAGE_SHIFT);
1255 get_page(page); /* increment page count */
1256 vmf->page = page;
1257 return 0; /* success */
1258 }
1259 sa += len;
1260 offset -= len;
1261 }
1262
1263 return VM_FAULT_SIGBUS;
1264 }
1265
1266 static const struct vm_operations_struct sg_mmap_vm_ops = {
1267 .fault = sg_vma_fault,
1268 };
1269
1270 static int
1271 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1272 {
1273 Sg_fd *sfp;
1274 unsigned long req_sz, len, sa;
1275 Sg_scatter_hold *rsv_schp;
1276 int k, length;
1277
1278 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1279 return -ENXIO;
1280 req_sz = vma->vm_end - vma->vm_start;
1281 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1282 "sg_mmap starting, vm_start=%p, len=%d\n",
1283 (void *) vma->vm_start, (int) req_sz));
1284 if (vma->vm_pgoff)
1285 return -EINVAL; /* want no offset */
1286 rsv_schp = &sfp->reserve;
1287 if (req_sz > rsv_schp->bufflen)
1288 return -ENOMEM; /* cannot map more than reserved buffer */
1289
1290 sa = vma->vm_start;
1291 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1292 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1293 len = vma->vm_end - sa;
1294 len = (len < length) ? len : length;
1295 sa += len;
1296 }
1297
1298 sfp->mmap_called = 1;
1299 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
1300 vma->vm_private_data = sfp;
1301 vma->vm_ops = &sg_mmap_vm_ops;
1302 return 0;
1303 }
1304
1305 static void
1306 sg_rq_end_io_usercontext(struct work_struct *work)
1307 {
1308 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1309 struct sg_fd *sfp = srp->parentfp;
1310
1311 sg_finish_rem_req(srp);
1312 kref_put(&sfp->f_ref, sg_remove_sfp);
1313 }
1314
1315 /*
1316 * This function is a "bottom half" handler that is called by the mid
1317 * level when a command is completed (or has failed).
1318 */
1319 static void
1320 sg_rq_end_io(struct request *rq, int uptodate)
1321 {
1322 struct sg_request *srp = rq->end_io_data;
1323 Sg_device *sdp;
1324 Sg_fd *sfp;
1325 unsigned long iflags;
1326 unsigned int ms;
1327 char *sense;
1328 int result, resid, done = 1;
1329
1330 if (WARN_ON(srp->done != 0))
1331 return;
1332
1333 sfp = srp->parentfp;
1334 if (WARN_ON(sfp == NULL))
1335 return;
1336
1337 sdp = sfp->parentdp;
1338 if (unlikely(atomic_read(&sdp->detaching)))
1339 pr_info("%s: device detaching\n", __func__);
1340
1341 sense = rq->sense;
1342 result = rq->errors;
1343 resid = rq->resid_len;
1344
1345 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1346 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1347 srp->header.pack_id, result));
1348 srp->header.resid = resid;
1349 ms = jiffies_to_msecs(jiffies);
1350 srp->header.duration = (ms > srp->header.duration) ?
1351 (ms - srp->header.duration) : 0;
1352 if (0 != result) {
1353 struct scsi_sense_hdr sshdr;
1354
1355 srp->header.status = 0xff & result;
1356 srp->header.masked_status = status_byte(result);
1357 srp->header.msg_status = msg_byte(result);
1358 srp->header.host_status = host_byte(result);
1359 srp->header.driver_status = driver_byte(result);
1360 if ((sdp->sgdebug > 0) &&
1361 ((CHECK_CONDITION == srp->header.masked_status) ||
1362 (COMMAND_TERMINATED == srp->header.masked_status)))
1363 __scsi_print_sense(__func__, sense,
1364 SCSI_SENSE_BUFFERSIZE);
1365
1366 /* Following if statement is a patch supplied by Eric Youngdale */
1367 if (driver_byte(result) != 0
1368 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1369 && !scsi_sense_is_deferred(&sshdr)
1370 && sshdr.sense_key == UNIT_ATTENTION
1371 && sdp->device->removable) {
1372 /* Detected possible disc change. Set the bit - this */
1373 /* may be used if there are filesystems using this device */
1374 sdp->device->changed = 1;
1375 }
1376 }
1377 /* Rely on write phase to clean out srp status values, so no "else" */
1378
1379 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1380 if (unlikely(srp->orphan)) {
1381 if (sfp->keep_orphan)
1382 srp->sg_io_owned = 0;
1383 else
1384 done = 0;
1385 }
1386 srp->done = done;
1387 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1388
1389 if (likely(done)) {
1390 /* Now wake up any sg_read() that is waiting for this
1391 * packet.
1392 */
1393 wake_up_interruptible(&sfp->read_wait);
1394 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1395 kref_put(&sfp->f_ref, sg_remove_sfp);
1396 } else {
1397 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1398 schedule_work(&srp->ew.work);
1399 }
1400 }
1401
1402 static const struct file_operations sg_fops = {
1403 .owner = THIS_MODULE,
1404 .read = sg_read,
1405 .write = sg_write,
1406 .poll = sg_poll,
1407 .unlocked_ioctl = sg_ioctl,
1408 #ifdef CONFIG_COMPAT
1409 .compat_ioctl = sg_compat_ioctl,
1410 #endif
1411 .open = sg_open,
1412 .mmap = sg_mmap,
1413 .release = sg_release,
1414 .fasync = sg_fasync,
1415 .llseek = no_llseek,
1416 };
1417
1418 static struct class *sg_sysfs_class;
1419
1420 static int sg_sysfs_valid = 0;
1421
1422 static Sg_device *
1423 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1424 {
1425 struct request_queue *q = scsidp->request_queue;
1426 Sg_device *sdp;
1427 unsigned long iflags;
1428 int error;
1429 u32 k;
1430
1431 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1432 if (!sdp) {
1433 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1434 "failure\n", __func__);
1435 return ERR_PTR(-ENOMEM);
1436 }
1437
1438 idr_preload(GFP_KERNEL);
1439 write_lock_irqsave(&sg_index_lock, iflags);
1440
1441 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1442 if (error < 0) {
1443 if (error == -ENOSPC) {
1444 sdev_printk(KERN_WARNING, scsidp,
1445 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1446 scsidp->type, SG_MAX_DEVS - 1);
1447 error = -ENODEV;
1448 } else {
1449 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1450 "allocation Sg_device failure: %d\n",
1451 __func__, error);
1452 }
1453 goto out_unlock;
1454 }
1455 k = error;
1456
1457 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1458 "sg_alloc: dev=%d \n", k));
1459 sprintf(disk->disk_name, "sg%d", k);
1460 disk->first_minor = k;
1461 sdp->disk = disk;
1462 sdp->device = scsidp;
1463 mutex_init(&sdp->open_rel_lock);
1464 INIT_LIST_HEAD(&sdp->sfds);
1465 init_waitqueue_head(&sdp->open_wait);
1466 atomic_set(&sdp->detaching, 0);
1467 rwlock_init(&sdp->sfd_lock);
1468 sdp->sg_tablesize = queue_max_segments(q);
1469 sdp->index = k;
1470 kref_init(&sdp->d_ref);
1471 error = 0;
1472
1473 out_unlock:
1474 write_unlock_irqrestore(&sg_index_lock, iflags);
1475 idr_preload_end();
1476
1477 if (error) {
1478 kfree(sdp);
1479 return ERR_PTR(error);
1480 }
1481 return sdp;
1482 }
1483
1484 static int
1485 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1486 {
1487 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1488 struct gendisk *disk;
1489 Sg_device *sdp = NULL;
1490 struct cdev * cdev = NULL;
1491 int error;
1492 unsigned long iflags;
1493
1494 disk = alloc_disk(1);
1495 if (!disk) {
1496 pr_warn("%s: alloc_disk failed\n", __func__);
1497 return -ENOMEM;
1498 }
1499 disk->major = SCSI_GENERIC_MAJOR;
1500
1501 error = -ENOMEM;
1502 cdev = cdev_alloc();
1503 if (!cdev) {
1504 pr_warn("%s: cdev_alloc failed\n", __func__);
1505 goto out;
1506 }
1507 cdev->owner = THIS_MODULE;
1508 cdev->ops = &sg_fops;
1509
1510 sdp = sg_alloc(disk, scsidp);
1511 if (IS_ERR(sdp)) {
1512 pr_warn("%s: sg_alloc failed\n", __func__);
1513 error = PTR_ERR(sdp);
1514 goto out;
1515 }
1516
1517 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1518 if (error)
1519 goto cdev_add_err;
1520
1521 sdp->cdev = cdev;
1522 if (sg_sysfs_valid) {
1523 struct device *sg_class_member;
1524
1525 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1526 MKDEV(SCSI_GENERIC_MAJOR,
1527 sdp->index),
1528 sdp, "%s", disk->disk_name);
1529 if (IS_ERR(sg_class_member)) {
1530 pr_err("%s: device_create failed\n", __func__);
1531 error = PTR_ERR(sg_class_member);
1532 goto cdev_add_err;
1533 }
1534 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1535 &sg_class_member->kobj, "generic");
1536 if (error)
1537 pr_err("%s: unable to make symlink 'generic' back "
1538 "to sg%d\n", __func__, sdp->index);
1539 } else
1540 pr_warn("%s: sg_sys Invalid\n", __func__);
1541
1542 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1543 "type %d\n", sdp->index, scsidp->type);
1544
1545 dev_set_drvdata(cl_dev, sdp);
1546
1547 return 0;
1548
1549 cdev_add_err:
1550 write_lock_irqsave(&sg_index_lock, iflags);
1551 idr_remove(&sg_index_idr, sdp->index);
1552 write_unlock_irqrestore(&sg_index_lock, iflags);
1553 kfree(sdp);
1554
1555 out:
1556 put_disk(disk);
1557 if (cdev)
1558 cdev_del(cdev);
1559 return error;
1560 }
1561
1562 static void
1563 sg_device_destroy(struct kref *kref)
1564 {
1565 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1566 unsigned long flags;
1567
1568 /* CAUTION! Note that the device can still be found via idr_find()
1569 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1570 * any other cleanup.
1571 */
1572
1573 write_lock_irqsave(&sg_index_lock, flags);
1574 idr_remove(&sg_index_idr, sdp->index);
1575 write_unlock_irqrestore(&sg_index_lock, flags);
1576
1577 SCSI_LOG_TIMEOUT(3,
1578 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1579
1580 put_disk(sdp->disk);
1581 kfree(sdp);
1582 }
1583
1584 static void
1585 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1586 {
1587 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1588 Sg_device *sdp = dev_get_drvdata(cl_dev);
1589 unsigned long iflags;
1590 Sg_fd *sfp;
1591 int val;
1592
1593 if (!sdp)
1594 return;
1595 /* want sdp->detaching non-zero as soon as possible */
1596 val = atomic_inc_return(&sdp->detaching);
1597 if (val > 1)
1598 return; /* only want to do following once per device */
1599
1600 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1601 "%s\n", __func__));
1602
1603 read_lock_irqsave(&sdp->sfd_lock, iflags);
1604 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1605 wake_up_interruptible_all(&sfp->read_wait);
1606 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1607 }
1608 wake_up_interruptible_all(&sdp->open_wait);
1609 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1610
1611 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1612 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1613 cdev_del(sdp->cdev);
1614 sdp->cdev = NULL;
1615
1616 kref_put(&sdp->d_ref, sg_device_destroy);
1617 }
1618
1619 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1620 module_param_named(def_reserved_size, def_reserved_size, int,
1621 S_IRUGO | S_IWUSR);
1622 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1623
1624 MODULE_AUTHOR("Douglas Gilbert");
1625 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1626 MODULE_LICENSE("GPL");
1627 MODULE_VERSION(SG_VERSION_STR);
1628 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1629
1630 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1631 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1632 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1633 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1634
1635 static int __init
1636 init_sg(void)
1637 {
1638 int rc;
1639
1640 if (scatter_elem_sz < PAGE_SIZE) {
1641 scatter_elem_sz = PAGE_SIZE;
1642 scatter_elem_sz_prev = scatter_elem_sz;
1643 }
1644 if (def_reserved_size >= 0)
1645 sg_big_buff = def_reserved_size;
1646 else
1647 def_reserved_size = sg_big_buff;
1648
1649 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1650 SG_MAX_DEVS, "sg");
1651 if (rc)
1652 return rc;
1653 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1654 if ( IS_ERR(sg_sysfs_class) ) {
1655 rc = PTR_ERR(sg_sysfs_class);
1656 goto err_out;
1657 }
1658 sg_sysfs_valid = 1;
1659 rc = scsi_register_interface(&sg_interface);
1660 if (0 == rc) {
1661 #ifdef CONFIG_SCSI_PROC_FS
1662 sg_proc_init();
1663 #endif /* CONFIG_SCSI_PROC_FS */
1664 return 0;
1665 }
1666 class_destroy(sg_sysfs_class);
1667 err_out:
1668 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1669 return rc;
1670 }
1671
1672 static void __exit
1673 exit_sg(void)
1674 {
1675 #ifdef CONFIG_SCSI_PROC_FS
1676 sg_proc_cleanup();
1677 #endif /* CONFIG_SCSI_PROC_FS */
1678 scsi_unregister_interface(&sg_interface);
1679 class_destroy(sg_sysfs_class);
1680 sg_sysfs_valid = 0;
1681 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1682 SG_MAX_DEVS);
1683 idr_destroy(&sg_index_idr);
1684 }
1685
1686 static int
1687 sg_start_req(Sg_request *srp, unsigned char *cmd)
1688 {
1689 int res;
1690 struct request *rq;
1691 Sg_fd *sfp = srp->parentfp;
1692 sg_io_hdr_t *hp = &srp->header;
1693 int dxfer_len = (int) hp->dxfer_len;
1694 int dxfer_dir = hp->dxfer_direction;
1695 unsigned int iov_count = hp->iovec_count;
1696 Sg_scatter_hold *req_schp = &srp->data;
1697 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1698 struct request_queue *q = sfp->parentdp->device->request_queue;
1699 struct rq_map_data *md, map_data;
1700 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1701 unsigned char *long_cmdp = NULL;
1702
1703 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1704 "sg_start_req: dxfer_len=%d\n",
1705 dxfer_len));
1706
1707 if (hp->cmd_len > BLK_MAX_CDB) {
1708 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1709 if (!long_cmdp)
1710 return -ENOMEM;
1711 }
1712
1713 rq = blk_get_request(q, rw, GFP_ATOMIC);
1714 if (!rq) {
1715 kfree(long_cmdp);
1716 return -ENOMEM;
1717 }
1718
1719 blk_rq_set_block_pc(rq);
1720
1721 if (hp->cmd_len > BLK_MAX_CDB)
1722 rq->cmd = long_cmdp;
1723 memcpy(rq->cmd, cmd, hp->cmd_len);
1724 rq->cmd_len = hp->cmd_len;
1725
1726 srp->rq = rq;
1727 rq->end_io_data = srp;
1728 rq->sense = srp->sense_b;
1729 rq->retries = SG_DEFAULT_RETRIES;
1730
1731 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1732 return 0;
1733
1734 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1735 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1736 !sfp->parentdp->device->host->unchecked_isa_dma &&
1737 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1738 md = NULL;
1739 else
1740 md = &map_data;
1741
1742 if (md) {
1743 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1744 sg_link_reserve(sfp, srp, dxfer_len);
1745 else {
1746 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1747 if (res)
1748 return res;
1749 }
1750
1751 md->pages = req_schp->pages;
1752 md->page_order = req_schp->page_order;
1753 md->nr_entries = req_schp->k_use_sg;
1754 md->offset = 0;
1755 md->null_mapped = hp->dxferp ? 0 : 1;
1756 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1757 md->from_user = 1;
1758 else
1759 md->from_user = 0;
1760 }
1761
1762 if (iov_count) {
1763 int len, size = sizeof(struct sg_iovec) * iov_count;
1764 struct iovec *iov;
1765
1766 iov = memdup_user(hp->dxferp, size);
1767 if (IS_ERR(iov))
1768 return PTR_ERR(iov);
1769
1770 len = iov_length(iov, iov_count);
1771 if (hp->dxfer_len < len) {
1772 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1773 len = hp->dxfer_len;
1774 }
1775
1776 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1777 iov_count,
1778 len, GFP_ATOMIC);
1779 kfree(iov);
1780 } else
1781 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1782 hp->dxfer_len, GFP_ATOMIC);
1783
1784 if (!res) {
1785 srp->bio = rq->bio;
1786
1787 if (!md) {
1788 req_schp->dio_in_use = 1;
1789 hp->info |= SG_INFO_DIRECT_IO;
1790 }
1791 }
1792 return res;
1793 }
1794
1795 static int
1796 sg_finish_rem_req(Sg_request *srp)
1797 {
1798 int ret = 0;
1799
1800 Sg_fd *sfp = srp->parentfp;
1801 Sg_scatter_hold *req_schp = &srp->data;
1802
1803 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1804 "sg_finish_rem_req: res_used=%d\n",
1805 (int) srp->res_used));
1806 if (srp->rq) {
1807 if (srp->bio)
1808 ret = blk_rq_unmap_user(srp->bio);
1809
1810 if (srp->rq->cmd != srp->rq->__cmd)
1811 kfree(srp->rq->cmd);
1812 blk_put_request(srp->rq);
1813 }
1814
1815 if (srp->res_used)
1816 sg_unlink_reserve(sfp, srp);
1817 else
1818 sg_remove_scat(sfp, req_schp);
1819
1820 sg_remove_request(sfp, srp);
1821
1822 return ret;
1823 }
1824
1825 static int
1826 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1827 {
1828 int sg_bufflen = tablesize * sizeof(struct page *);
1829 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1830
1831 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1832 if (!schp->pages)
1833 return -ENOMEM;
1834 schp->sglist_len = sg_bufflen;
1835 return tablesize; /* number of scat_gath elements allocated */
1836 }
1837
1838 static int
1839 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1840 {
1841 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1842 int sg_tablesize = sfp->parentdp->sg_tablesize;
1843 int blk_size = buff_size, order;
1844 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1845
1846 if (blk_size < 0)
1847 return -EFAULT;
1848 if (0 == blk_size)
1849 ++blk_size; /* don't know why */
1850 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1851 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1852 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1853 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1854 buff_size, blk_size));
1855
1856 /* N.B. ret_sz carried into this block ... */
1857 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1858 if (mx_sc_elems < 0)
1859 return mx_sc_elems; /* most likely -ENOMEM */
1860
1861 num = scatter_elem_sz;
1862 if (unlikely(num != scatter_elem_sz_prev)) {
1863 if (num < PAGE_SIZE) {
1864 scatter_elem_sz = PAGE_SIZE;
1865 scatter_elem_sz_prev = PAGE_SIZE;
1866 } else
1867 scatter_elem_sz_prev = num;
1868 }
1869
1870 if (sfp->low_dma)
1871 gfp_mask |= GFP_DMA;
1872
1873 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1874 gfp_mask |= __GFP_ZERO;
1875
1876 order = get_order(num);
1877 retry:
1878 ret_sz = 1 << (PAGE_SHIFT + order);
1879
1880 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1881 k++, rem_sz -= ret_sz) {
1882
1883 num = (rem_sz > scatter_elem_sz_prev) ?
1884 scatter_elem_sz_prev : rem_sz;
1885
1886 schp->pages[k] = alloc_pages(gfp_mask, order);
1887 if (!schp->pages[k])
1888 goto out;
1889
1890 if (num == scatter_elem_sz_prev) {
1891 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1892 scatter_elem_sz = ret_sz;
1893 scatter_elem_sz_prev = ret_sz;
1894 }
1895 }
1896
1897 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1898 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1899 k, num, ret_sz));
1900 } /* end of for loop */
1901
1902 schp->page_order = order;
1903 schp->k_use_sg = k;
1904 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1905 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1906 k, rem_sz));
1907
1908 schp->bufflen = blk_size;
1909 if (rem_sz > 0) /* must have failed */
1910 return -ENOMEM;
1911 return 0;
1912 out:
1913 for (i = 0; i < k; i++)
1914 __free_pages(schp->pages[i], order);
1915
1916 if (--order >= 0)
1917 goto retry;
1918
1919 return -ENOMEM;
1920 }
1921
1922 static void
1923 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1924 {
1925 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1926 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1927 if (schp->pages && schp->sglist_len > 0) {
1928 if (!schp->dio_in_use) {
1929 int k;
1930
1931 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1932 SCSI_LOG_TIMEOUT(5,
1933 sg_printk(KERN_INFO, sfp->parentdp,
1934 "sg_remove_scat: k=%d, pg=0x%p\n",
1935 k, schp->pages[k]));
1936 __free_pages(schp->pages[k], schp->page_order);
1937 }
1938
1939 kfree(schp->pages);
1940 }
1941 }
1942 memset(schp, 0, sizeof (*schp));
1943 }
1944
1945 static int
1946 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1947 {
1948 Sg_scatter_hold *schp = &srp->data;
1949 int k, num;
1950
1951 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1952 "sg_read_oxfer: num_read_xfer=%d\n",
1953 num_read_xfer));
1954 if ((!outp) || (num_read_xfer <= 0))
1955 return 0;
1956
1957 num = 1 << (PAGE_SHIFT + schp->page_order);
1958 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1959 if (num > num_read_xfer) {
1960 if (__copy_to_user(outp, page_address(schp->pages[k]),
1961 num_read_xfer))
1962 return -EFAULT;
1963 break;
1964 } else {
1965 if (__copy_to_user(outp, page_address(schp->pages[k]),
1966 num))
1967 return -EFAULT;
1968 num_read_xfer -= num;
1969 if (num_read_xfer <= 0)
1970 break;
1971 outp += num;
1972 }
1973 }
1974
1975 return 0;
1976 }
1977
1978 static void
1979 sg_build_reserve(Sg_fd * sfp, int req_size)
1980 {
1981 Sg_scatter_hold *schp = &sfp->reserve;
1982
1983 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1984 "sg_build_reserve: req_size=%d\n", req_size));
1985 do {
1986 if (req_size < PAGE_SIZE)
1987 req_size = PAGE_SIZE;
1988 if (0 == sg_build_indirect(schp, sfp, req_size))
1989 return;
1990 else
1991 sg_remove_scat(sfp, schp);
1992 req_size >>= 1; /* divide by 2 */
1993 } while (req_size > (PAGE_SIZE / 2));
1994 }
1995
1996 static void
1997 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1998 {
1999 Sg_scatter_hold *req_schp = &srp->data;
2000 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2001 int k, num, rem;
2002
2003 srp->res_used = 1;
2004 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
2005 "sg_link_reserve: size=%d\n", size));
2006 rem = size;
2007
2008 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
2009 for (k = 0; k < rsv_schp->k_use_sg; k++) {
2010 if (rem <= num) {
2011 req_schp->k_use_sg = k + 1;
2012 req_schp->sglist_len = rsv_schp->sglist_len;
2013 req_schp->pages = rsv_schp->pages;
2014
2015 req_schp->bufflen = size;
2016 req_schp->page_order = rsv_schp->page_order;
2017 break;
2018 } else
2019 rem -= num;
2020 }
2021
2022 if (k >= rsv_schp->k_use_sg)
2023 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2024 "sg_link_reserve: BAD size\n"));
2025 }
2026
2027 static void
2028 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2029 {
2030 Sg_scatter_hold *req_schp = &srp->data;
2031
2032 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2033 "sg_unlink_reserve: req->k_use_sg=%d\n",
2034 (int) req_schp->k_use_sg));
2035 req_schp->k_use_sg = 0;
2036 req_schp->bufflen = 0;
2037 req_schp->pages = NULL;
2038 req_schp->page_order = 0;
2039 req_schp->sglist_len = 0;
2040 sfp->save_scat_len = 0;
2041 srp->res_used = 0;
2042 }
2043
2044 static Sg_request *
2045 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2046 {
2047 Sg_request *resp;
2048 unsigned long iflags;
2049
2050 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2051 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2052 /* look for requests that are ready + not SG_IO owned */
2053 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2054 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2055 resp->done = 2; /* guard against other readers */
2056 break;
2057 }
2058 }
2059 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2060 return resp;
2061 }
2062
2063 /* always adds to end of list */
2064 static Sg_request *
2065 sg_add_request(Sg_fd * sfp)
2066 {
2067 int k;
2068 unsigned long iflags;
2069 Sg_request *resp;
2070 Sg_request *rp = sfp->req_arr;
2071
2072 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2073 resp = sfp->headrp;
2074 if (!resp) {
2075 memset(rp, 0, sizeof (Sg_request));
2076 rp->parentfp = sfp;
2077 resp = rp;
2078 sfp->headrp = resp;
2079 } else {
2080 if (0 == sfp->cmd_q)
2081 resp = NULL; /* command queuing disallowed */
2082 else {
2083 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2084 if (!rp->parentfp)
2085 break;
2086 }
2087 if (k < SG_MAX_QUEUE) {
2088 memset(rp, 0, sizeof (Sg_request));
2089 rp->parentfp = sfp;
2090 while (resp->nextrp)
2091 resp = resp->nextrp;
2092 resp->nextrp = rp;
2093 resp = rp;
2094 } else
2095 resp = NULL;
2096 }
2097 }
2098 if (resp) {
2099 resp->nextrp = NULL;
2100 resp->header.duration = jiffies_to_msecs(jiffies);
2101 }
2102 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2103 return resp;
2104 }
2105
2106 /* Return of 1 for found; 0 for not found */
2107 static int
2108 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2109 {
2110 Sg_request *prev_rp;
2111 Sg_request *rp;
2112 unsigned long iflags;
2113 int res = 0;
2114
2115 if ((!sfp) || (!srp) || (!sfp->headrp))
2116 return res;
2117 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2118 prev_rp = sfp->headrp;
2119 if (srp == prev_rp) {
2120 sfp->headrp = prev_rp->nextrp;
2121 prev_rp->parentfp = NULL;
2122 res = 1;
2123 } else {
2124 while ((rp = prev_rp->nextrp)) {
2125 if (srp == rp) {
2126 prev_rp->nextrp = rp->nextrp;
2127 rp->parentfp = NULL;
2128 res = 1;
2129 break;
2130 }
2131 prev_rp = rp;
2132 }
2133 }
2134 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2135 return res;
2136 }
2137
2138 static Sg_fd *
2139 sg_add_sfp(Sg_device * sdp)
2140 {
2141 Sg_fd *sfp;
2142 unsigned long iflags;
2143 int bufflen;
2144
2145 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2146 if (!sfp)
2147 return ERR_PTR(-ENOMEM);
2148
2149 init_waitqueue_head(&sfp->read_wait);
2150 rwlock_init(&sfp->rq_list_lock);
2151
2152 kref_init(&sfp->f_ref);
2153 sfp->timeout = SG_DEFAULT_TIMEOUT;
2154 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2155 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2156 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2157 sdp->device->host->unchecked_isa_dma : 1;
2158 sfp->cmd_q = SG_DEF_COMMAND_Q;
2159 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2160 sfp->parentdp = sdp;
2161 write_lock_irqsave(&sdp->sfd_lock, iflags);
2162 if (atomic_read(&sdp->detaching)) {
2163 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2164 return ERR_PTR(-ENODEV);
2165 }
2166 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2167 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2168 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2169 "sg_add_sfp: sfp=0x%p\n", sfp));
2170 if (unlikely(sg_big_buff != def_reserved_size))
2171 sg_big_buff = def_reserved_size;
2172
2173 bufflen = min_t(int, sg_big_buff,
2174 max_sectors_bytes(sdp->device->request_queue));
2175 sg_build_reserve(sfp, bufflen);
2176 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2177 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2178 sfp->reserve.bufflen,
2179 sfp->reserve.k_use_sg));
2180
2181 kref_get(&sdp->d_ref);
2182 __module_get(THIS_MODULE);
2183 return sfp;
2184 }
2185
2186 static void
2187 sg_remove_sfp_usercontext(struct work_struct *work)
2188 {
2189 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2190 struct sg_device *sdp = sfp->parentdp;
2191
2192 /* Cleanup any responses which were never read(). */
2193 while (sfp->headrp)
2194 sg_finish_rem_req(sfp->headrp);
2195
2196 if (sfp->reserve.bufflen > 0) {
2197 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2198 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2199 (int) sfp->reserve.bufflen,
2200 (int) sfp->reserve.k_use_sg));
2201 sg_remove_scat(sfp, &sfp->reserve);
2202 }
2203
2204 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2205 "sg_remove_sfp: sfp=0x%p\n", sfp));
2206 kfree(sfp);
2207
2208 scsi_device_put(sdp->device);
2209 kref_put(&sdp->d_ref, sg_device_destroy);
2210 module_put(THIS_MODULE);
2211 }
2212
2213 static void
2214 sg_remove_sfp(struct kref *kref)
2215 {
2216 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2217 struct sg_device *sdp = sfp->parentdp;
2218 unsigned long iflags;
2219
2220 write_lock_irqsave(&sdp->sfd_lock, iflags);
2221 list_del(&sfp->sfd_siblings);
2222 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2223
2224 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2225 schedule_work(&sfp->ew.work);
2226 }
2227
2228 static int
2229 sg_res_in_use(Sg_fd * sfp)
2230 {
2231 const Sg_request *srp;
2232 unsigned long iflags;
2233
2234 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2235 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2236 if (srp->res_used)
2237 break;
2238 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2239 return srp ? 1 : 0;
2240 }
2241
2242 #ifdef CONFIG_SCSI_PROC_FS
2243 static int
2244 sg_idr_max_id(int id, void *p, void *data)
2245 {
2246 int *k = data;
2247
2248 if (*k < id)
2249 *k = id;
2250
2251 return 0;
2252 }
2253
2254 static int
2255 sg_last_dev(void)
2256 {
2257 int k = -1;
2258 unsigned long iflags;
2259
2260 read_lock_irqsave(&sg_index_lock, iflags);
2261 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2262 read_unlock_irqrestore(&sg_index_lock, iflags);
2263 return k + 1; /* origin 1 */
2264 }
2265 #endif
2266
2267 /* must be called with sg_index_lock held */
2268 static Sg_device *sg_lookup_dev(int dev)
2269 {
2270 return idr_find(&sg_index_idr, dev);
2271 }
2272
2273 static Sg_device *
2274 sg_get_dev(int dev)
2275 {
2276 struct sg_device *sdp;
2277 unsigned long flags;
2278
2279 read_lock_irqsave(&sg_index_lock, flags);
2280 sdp = sg_lookup_dev(dev);
2281 if (!sdp)
2282 sdp = ERR_PTR(-ENXIO);
2283 else if (atomic_read(&sdp->detaching)) {
2284 /* If sdp->detaching, then the refcount may already be 0, in
2285 * which case it would be a bug to do kref_get().
2286 */
2287 sdp = ERR_PTR(-ENODEV);
2288 } else
2289 kref_get(&sdp->d_ref);
2290 read_unlock_irqrestore(&sg_index_lock, flags);
2291
2292 return sdp;
2293 }
2294
2295 #ifdef CONFIG_SCSI_PROC_FS
2296
2297 static struct proc_dir_entry *sg_proc_sgp = NULL;
2298
2299 static char sg_proc_sg_dirname[] = "scsi/sg";
2300
2301 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2302
2303 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2304 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2305 size_t count, loff_t *off);
2306 static const struct file_operations adio_fops = {
2307 .owner = THIS_MODULE,
2308 .open = sg_proc_single_open_adio,
2309 .read = seq_read,
2310 .llseek = seq_lseek,
2311 .write = sg_proc_write_adio,
2312 .release = single_release,
2313 };
2314
2315 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2316 static ssize_t sg_proc_write_dressz(struct file *filp,
2317 const char __user *buffer, size_t count, loff_t *off);
2318 static const struct file_operations dressz_fops = {
2319 .owner = THIS_MODULE,
2320 .open = sg_proc_single_open_dressz,
2321 .read = seq_read,
2322 .llseek = seq_lseek,
2323 .write = sg_proc_write_dressz,
2324 .release = single_release,
2325 };
2326
2327 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2328 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2329 static const struct file_operations version_fops = {
2330 .owner = THIS_MODULE,
2331 .open = sg_proc_single_open_version,
2332 .read = seq_read,
2333 .llseek = seq_lseek,
2334 .release = single_release,
2335 };
2336
2337 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2338 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2339 static const struct file_operations devhdr_fops = {
2340 .owner = THIS_MODULE,
2341 .open = sg_proc_single_open_devhdr,
2342 .read = seq_read,
2343 .llseek = seq_lseek,
2344 .release = single_release,
2345 };
2346
2347 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2348 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2349 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2350 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2351 static void dev_seq_stop(struct seq_file *s, void *v);
2352 static const struct file_operations dev_fops = {
2353 .owner = THIS_MODULE,
2354 .open = sg_proc_open_dev,
2355 .read = seq_read,
2356 .llseek = seq_lseek,
2357 .release = seq_release,
2358 };
2359 static const struct seq_operations dev_seq_ops = {
2360 .start = dev_seq_start,
2361 .next = dev_seq_next,
2362 .stop = dev_seq_stop,
2363 .show = sg_proc_seq_show_dev,
2364 };
2365
2366 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2367 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2368 static const struct file_operations devstrs_fops = {
2369 .owner = THIS_MODULE,
2370 .open = sg_proc_open_devstrs,
2371 .read = seq_read,
2372 .llseek = seq_lseek,
2373 .release = seq_release,
2374 };
2375 static const struct seq_operations devstrs_seq_ops = {
2376 .start = dev_seq_start,
2377 .next = dev_seq_next,
2378 .stop = dev_seq_stop,
2379 .show = sg_proc_seq_show_devstrs,
2380 };
2381
2382 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2383 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2384 static const struct file_operations debug_fops = {
2385 .owner = THIS_MODULE,
2386 .open = sg_proc_open_debug,
2387 .read = seq_read,
2388 .llseek = seq_lseek,
2389 .release = seq_release,
2390 };
2391 static const struct seq_operations debug_seq_ops = {
2392 .start = dev_seq_start,
2393 .next = dev_seq_next,
2394 .stop = dev_seq_stop,
2395 .show = sg_proc_seq_show_debug,
2396 };
2397
2398
2399 struct sg_proc_leaf {
2400 const char * name;
2401 const struct file_operations * fops;
2402 };
2403
2404 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2405 {"allow_dio", &adio_fops},
2406 {"debug", &debug_fops},
2407 {"def_reserved_size", &dressz_fops},
2408 {"device_hdr", &devhdr_fops},
2409 {"devices", &dev_fops},
2410 {"device_strs", &devstrs_fops},
2411 {"version", &version_fops}
2412 };
2413
2414 static int
2415 sg_proc_init(void)
2416 {
2417 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2418 int k;
2419
2420 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2421 if (!sg_proc_sgp)
2422 return 1;
2423 for (k = 0; k < num_leaves; ++k) {
2424 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2425 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2426 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2427 }
2428 return 0;
2429 }
2430
2431 static void
2432 sg_proc_cleanup(void)
2433 {
2434 int k;
2435 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2436
2437 if (!sg_proc_sgp)
2438 return;
2439 for (k = 0; k < num_leaves; ++k)
2440 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2441 remove_proc_entry(sg_proc_sg_dirname, NULL);
2442 }
2443
2444
2445 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2446 {
2447 seq_printf(s, "%d\n", *((int *)s->private));
2448 return 0;
2449 }
2450
2451 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2452 {
2453 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2454 }
2455
2456 static ssize_t
2457 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2458 size_t count, loff_t *off)
2459 {
2460 int err;
2461 unsigned long num;
2462
2463 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2464 return -EACCES;
2465 err = kstrtoul_from_user(buffer, count, 0, &num);
2466 if (err)
2467 return err;
2468 sg_allow_dio = num ? 1 : 0;
2469 return count;
2470 }
2471
2472 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2473 {
2474 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2475 }
2476
2477 static ssize_t
2478 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2479 size_t count, loff_t *off)
2480 {
2481 int err;
2482 unsigned long k = ULONG_MAX;
2483
2484 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2485 return -EACCES;
2486
2487 err = kstrtoul_from_user(buffer, count, 0, &k);
2488 if (err)
2489 return err;
2490 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2491 sg_big_buff = k;
2492 return count;
2493 }
2494 return -ERANGE;
2495 }
2496
2497 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2498 {
2499 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2500 sg_version_date);
2501 return 0;
2502 }
2503
2504 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2505 {
2506 return single_open(file, sg_proc_seq_show_version, NULL);
2507 }
2508
2509 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2510 {
2511 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2512 return 0;
2513 }
2514
2515 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2516 {
2517 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2518 }
2519
2520 struct sg_proc_deviter {
2521 loff_t index;
2522 size_t max;
2523 };
2524
2525 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2526 {
2527 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2528
2529 s->private = it;
2530 if (! it)
2531 return NULL;
2532
2533 it->index = *pos;
2534 it->max = sg_last_dev();
2535 if (it->index >= it->max)
2536 return NULL;
2537 return it;
2538 }
2539
2540 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2541 {
2542 struct sg_proc_deviter * it = s->private;
2543
2544 *pos = ++it->index;
2545 return (it->index < it->max) ? it : NULL;
2546 }
2547
2548 static void dev_seq_stop(struct seq_file *s, void *v)
2549 {
2550 kfree(s->private);
2551 }
2552
2553 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2554 {
2555 return seq_open(file, &dev_seq_ops);
2556 }
2557
2558 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2559 {
2560 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2561 Sg_device *sdp;
2562 struct scsi_device *scsidp;
2563 unsigned long iflags;
2564
2565 read_lock_irqsave(&sg_index_lock, iflags);
2566 sdp = it ? sg_lookup_dev(it->index) : NULL;
2567 if ((NULL == sdp) || (NULL == sdp->device) ||
2568 (atomic_read(&sdp->detaching)))
2569 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2570 else {
2571 scsidp = sdp->device;
2572 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2573 scsidp->host->host_no, scsidp->channel,
2574 scsidp->id, scsidp->lun, (int) scsidp->type,
2575 1,
2576 (int) scsidp->queue_depth,
2577 (int) atomic_read(&scsidp->device_busy),
2578 (int) scsi_device_online(scsidp));
2579 }
2580 read_unlock_irqrestore(&sg_index_lock, iflags);
2581 return 0;
2582 }
2583
2584 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2585 {
2586 return seq_open(file, &devstrs_seq_ops);
2587 }
2588
2589 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2590 {
2591 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2592 Sg_device *sdp;
2593 struct scsi_device *scsidp;
2594 unsigned long iflags;
2595
2596 read_lock_irqsave(&sg_index_lock, iflags);
2597 sdp = it ? sg_lookup_dev(it->index) : NULL;
2598 scsidp = sdp ? sdp->device : NULL;
2599 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2600 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2601 scsidp->vendor, scsidp->model, scsidp->rev);
2602 else
2603 seq_puts(s, "<no active device>\n");
2604 read_unlock_irqrestore(&sg_index_lock, iflags);
2605 return 0;
2606 }
2607
2608 /* must be called while holding sg_index_lock */
2609 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2610 {
2611 int k, m, new_interface, blen, usg;
2612 Sg_request *srp;
2613 Sg_fd *fp;
2614 const sg_io_hdr_t *hp;
2615 const char * cp;
2616 unsigned int ms;
2617
2618 k = 0;
2619 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2620 k++;
2621 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2622 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2623 "(res)sgat=%d low_dma=%d\n", k,
2624 jiffies_to_msecs(fp->timeout),
2625 fp->reserve.bufflen,
2626 (int) fp->reserve.k_use_sg,
2627 (int) fp->low_dma);
2628 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2629 (int) fp->cmd_q, (int) fp->force_packid,
2630 (int) fp->keep_orphan);
2631 for (m = 0, srp = fp->headrp;
2632 srp != NULL;
2633 ++m, srp = srp->nextrp) {
2634 hp = &srp->header;
2635 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2636 if (srp->res_used) {
2637 if (new_interface &&
2638 (SG_FLAG_MMAP_IO & hp->flags))
2639 cp = " mmap>> ";
2640 else
2641 cp = " rb>> ";
2642 } else {
2643 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2644 cp = " dio>> ";
2645 else
2646 cp = " ";
2647 }
2648 seq_puts(s, cp);
2649 blen = srp->data.bufflen;
2650 usg = srp->data.k_use_sg;
2651 seq_puts(s, srp->done ?
2652 ((1 == srp->done) ? "rcv:" : "fin:")
2653 : "act:");
2654 seq_printf(s, " id=%d blen=%d",
2655 srp->header.pack_id, blen);
2656 if (srp->done)
2657 seq_printf(s, " dur=%d", hp->duration);
2658 else {
2659 ms = jiffies_to_msecs(jiffies);
2660 seq_printf(s, " t_o/elap=%d/%d",
2661 (new_interface ? hp->timeout :
2662 jiffies_to_msecs(fp->timeout)),
2663 (ms > hp->duration ? ms - hp->duration : 0));
2664 }
2665 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2666 (int) srp->data.cmd_opcode);
2667 }
2668 if (0 == m)
2669 seq_puts(s, " No requests active\n");
2670 read_unlock(&fp->rq_list_lock);
2671 }
2672 }
2673
2674 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2675 {
2676 return seq_open(file, &debug_seq_ops);
2677 }
2678
2679 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2680 {
2681 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2682 Sg_device *sdp;
2683 unsigned long iflags;
2684
2685 if (it && (0 == it->index))
2686 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2687 (int)it->max, sg_big_buff);
2688
2689 read_lock_irqsave(&sg_index_lock, iflags);
2690 sdp = it ? sg_lookup_dev(it->index) : NULL;
2691 if (NULL == sdp)
2692 goto skip;
2693 read_lock(&sdp->sfd_lock);
2694 if (!list_empty(&sdp->sfds)) {
2695 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2696 if (atomic_read(&sdp->detaching))
2697 seq_puts(s, "detaching pending close ");
2698 else if (sdp->device) {
2699 struct scsi_device *scsidp = sdp->device;
2700
2701 seq_printf(s, "%d:%d:%d:%llu em=%d",
2702 scsidp->host->host_no,
2703 scsidp->channel, scsidp->id,
2704 scsidp->lun,
2705 scsidp->host->hostt->emulated);
2706 }
2707 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2708 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2709 sg_proc_debug_helper(s, sdp);
2710 }
2711 read_unlock(&sdp->sfd_lock);
2712 skip:
2713 read_unlock_irqrestore(&sg_index_lock, iflags);
2714 return 0;
2715 }
2716
2717 #endif /* CONFIG_SCSI_PROC_FS */
2718
2719 module_init(init_sg);
2720 module_exit(exit_sg);
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