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UBUNTU: Ubuntu-raspi2-4.10.0-1002.4
[mirror_ubuntu-zesty-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/errno.h>
37 #include <linux/mtio.h>
38 #include <linux/ioctl.h>
39 #include <linux/slab.h>
40 #include <linux/fcntl.h>
41 #include <linux/init.h>
42 #include <linux/poll.h>
43 #include <linux/moduleparam.h>
44 #include <linux/cdev.h>
45 #include <linux/idr.h>
46 #include <linux/seq_file.h>
47 #include <linux/blkdev.h>
48 #include <linux/delay.h>
49 #include <linux/blktrace_api.h>
50 #include <linux/mutex.h>
51 #include <linux/atomic.h>
52 #include <linux/ratelimit.h>
53 #include <linux/uio.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 #define SG_DEFAULT_TIMEOUT mult_frac(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
83
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 */
92 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
93
94 static int scatter_elem_sz = SG_SCATTER_SZ;
95 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
96
97 #define SG_SECTOR_SZ 512
98
99 static int sg_add_device(struct device *, struct class_interface *);
100 static void sg_remove_device(struct device *, struct class_interface *);
101
102 static DEFINE_IDR(sg_index_idr);
103 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
104 file descriptor list for device */
105
106 static struct class_interface sg_interface = {
107 .add_dev = sg_add_device,
108 .remove_dev = sg_remove_device,
109 };
110
111 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
112 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
113 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
114 unsigned bufflen; /* Size of (aggregate) data buffer */
115 struct page **pages;
116 int page_order;
117 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
118 unsigned char cmd_opcode; /* first byte of command */
119 } Sg_scatter_hold;
120
121 struct sg_device; /* forward declarations */
122 struct sg_fd;
123
124 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
125 struct sg_request *nextrp; /* NULL -> tail request (slist) */
126 struct sg_fd *parentfp; /* NULL -> not in use */
127 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
128 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
129 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
130 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
131 char orphan; /* 1 -> drop on sight, 0 -> normal */
132 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
133 /* done protected by rq_list_lock */
134 char done; /* 0->before bh, 1->before read, 2->read */
135 struct request *rq;
136 struct bio *bio;
137 struct execute_work ew;
138 } Sg_request;
139
140 typedef struct sg_fd { /* holds the state of a file descriptor */
141 struct list_head sfd_siblings; /* protected by device's sfd_lock */
142 struct sg_device *parentdp; /* owning device */
143 wait_queue_head_t read_wait; /* queue read until command done */
144 rwlock_t rq_list_lock; /* protect access to list in req_arr */
145 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
148 unsigned save_scat_len; /* original length of trunc. scat. element */
149 Sg_request *headrp; /* head of request slist, NULL->empty */
150 struct fasync_struct *async_qp; /* used by asynchronous notification */
151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
152 char low_dma; /* as in parent but possibly overridden to 1 */
153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
154 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
155 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */
156 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
157 char mmap_called; /* 0 -> mmap() never called on this fd */
158 struct kref f_ref;
159 struct execute_work ew;
160 } Sg_fd;
161
162 typedef struct sg_device { /* holds the state of each scsi generic device */
163 struct scsi_device *device;
164 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */
165 struct mutex open_rel_lock; /* held when in open() or release() */
166 int sg_tablesize; /* adapter's max scatter-gather table size */
167 u32 index; /* device index number */
168 struct list_head sfds;
169 rwlock_t sfd_lock; /* protect access to sfd list */
170 atomic_t detaching; /* 0->device usable, 1->device detaching */
171 bool exclude; /* 1->open(O_EXCL) succeeded and is active */
172 int open_cnt; /* count of opens (perhaps < num(sfds) ) */
173 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 struct gendisk *disk;
175 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
176 struct kref d_ref;
177 } Sg_device;
178
179 /* tasklet or soft irq callback */
180 static void sg_rq_end_io(struct request *rq, int uptodate);
181 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
182 static int sg_finish_rem_req(Sg_request * srp);
183 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
184 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
185 Sg_request * srp);
186 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
187 const char __user *buf, size_t count, int blocking,
188 int read_only, int sg_io_owned, Sg_request **o_srp);
189 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
191 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
192 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp);
193 static void sg_build_reserve(Sg_fd * sfp, int req_size);
194 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
195 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
196 static Sg_fd *sg_add_sfp(Sg_device * sdp);
197 static void sg_remove_sfp(struct kref *);
198 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
199 static Sg_request *sg_add_request(Sg_fd * sfp);
200 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
201 static int sg_res_in_use(Sg_fd * sfp);
202 static Sg_device *sg_get_dev(int dev);
203 static void sg_device_destroy(struct kref *kref);
204
205 #define SZ_SG_HEADER sizeof(struct sg_header)
206 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
207 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
208 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
209
210 #define sg_printk(prefix, sdp, fmt, a...) \
211 sdev_prefix_printk(prefix, (sdp)->device, \
212 (sdp)->disk->disk_name, fmt, ##a)
213
214 static int sg_allow_access(struct file *filp, unsigned char *cmd)
215 {
216 struct sg_fd *sfp = filp->private_data;
217
218 if (sfp->parentdp->device->type == TYPE_SCANNER)
219 return 0;
220
221 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
222 }
223
224 static int
225 open_wait(Sg_device *sdp, int flags)
226 {
227 int retval = 0;
228
229 if (flags & O_EXCL) {
230 while (sdp->open_cnt > 0) {
231 mutex_unlock(&sdp->open_rel_lock);
232 retval = wait_event_interruptible(sdp->open_wait,
233 (atomic_read(&sdp->detaching) ||
234 !sdp->open_cnt));
235 mutex_lock(&sdp->open_rel_lock);
236
237 if (retval) /* -ERESTARTSYS */
238 return retval;
239 if (atomic_read(&sdp->detaching))
240 return -ENODEV;
241 }
242 } else {
243 while (sdp->exclude) {
244 mutex_unlock(&sdp->open_rel_lock);
245 retval = wait_event_interruptible(sdp->open_wait,
246 (atomic_read(&sdp->detaching) ||
247 !sdp->exclude));
248 mutex_lock(&sdp->open_rel_lock);
249
250 if (retval) /* -ERESTARTSYS */
251 return retval;
252 if (atomic_read(&sdp->detaching))
253 return -ENODEV;
254 }
255 }
256
257 return retval;
258 }
259
260 /* Returns 0 on success, else a negated errno value */
261 static int
262 sg_open(struct inode *inode, struct file *filp)
263 {
264 int dev = iminor(inode);
265 int flags = filp->f_flags;
266 struct request_queue *q;
267 Sg_device *sdp;
268 Sg_fd *sfp;
269 int retval;
270
271 nonseekable_open(inode, filp);
272 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
273 return -EPERM; /* Can't lock it with read only access */
274 sdp = sg_get_dev(dev);
275 if (IS_ERR(sdp))
276 return PTR_ERR(sdp);
277
278 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
279 "sg_open: flags=0x%x\n", flags));
280
281 /* This driver's module count bumped by fops_get in <linux/fs.h> */
282 /* Prevent the device driver from vanishing while we sleep */
283 retval = scsi_device_get(sdp->device);
284 if (retval)
285 goto sg_put;
286
287 retval = scsi_autopm_get_device(sdp->device);
288 if (retval)
289 goto sdp_put;
290
291 /* scsi_block_when_processing_errors() may block so bypass
292 * check if O_NONBLOCK. Permits SCSI commands to be issued
293 * during error recovery. Tread carefully. */
294 if (!((flags & O_NONBLOCK) ||
295 scsi_block_when_processing_errors(sdp->device))) {
296 retval = -ENXIO;
297 /* we are in error recovery for this device */
298 goto error_out;
299 }
300
301 mutex_lock(&sdp->open_rel_lock);
302 if (flags & O_NONBLOCK) {
303 if (flags & O_EXCL) {
304 if (sdp->open_cnt > 0) {
305 retval = -EBUSY;
306 goto error_mutex_locked;
307 }
308 } else {
309 if (sdp->exclude) {
310 retval = -EBUSY;
311 goto error_mutex_locked;
312 }
313 }
314 } else {
315 retval = open_wait(sdp, flags);
316 if (retval) /* -ERESTARTSYS or -ENODEV */
317 goto error_mutex_locked;
318 }
319
320 /* N.B. at this point we are holding the open_rel_lock */
321 if (flags & O_EXCL)
322 sdp->exclude = true;
323
324 if (sdp->open_cnt < 1) { /* no existing opens */
325 sdp->sgdebug = 0;
326 q = sdp->device->request_queue;
327 sdp->sg_tablesize = queue_max_segments(q);
328 }
329 sfp = sg_add_sfp(sdp);
330 if (IS_ERR(sfp)) {
331 retval = PTR_ERR(sfp);
332 goto out_undo;
333 }
334
335 filp->private_data = sfp;
336 sdp->open_cnt++;
337 mutex_unlock(&sdp->open_rel_lock);
338
339 retval = 0;
340 sg_put:
341 kref_put(&sdp->d_ref, sg_device_destroy);
342 return retval;
343
344 out_undo:
345 if (flags & O_EXCL) {
346 sdp->exclude = false; /* undo if error */
347 wake_up_interruptible(&sdp->open_wait);
348 }
349 error_mutex_locked:
350 mutex_unlock(&sdp->open_rel_lock);
351 error_out:
352 scsi_autopm_put_device(sdp->device);
353 sdp_put:
354 scsi_device_put(sdp->device);
355 goto sg_put;
356 }
357
358 /* Release resources associated with a successful sg_open()
359 * Returns 0 on success, else a negated errno value */
360 static int
361 sg_release(struct inode *inode, struct file *filp)
362 {
363 Sg_device *sdp;
364 Sg_fd *sfp;
365
366 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
367 return -ENXIO;
368 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
369
370 mutex_lock(&sdp->open_rel_lock);
371 scsi_autopm_put_device(sdp->device);
372 kref_put(&sfp->f_ref, sg_remove_sfp);
373 sdp->open_cnt--;
374
375 /* possibly many open()s waiting on exlude clearing, start many;
376 * only open(O_EXCL)s wait on 0==open_cnt so only start one */
377 if (sdp->exclude) {
378 sdp->exclude = false;
379 wake_up_interruptible_all(&sdp->open_wait);
380 } else if (0 == sdp->open_cnt) {
381 wake_up_interruptible(&sdp->open_wait);
382 }
383 mutex_unlock(&sdp->open_rel_lock);
384 return 0;
385 }
386
387 static ssize_t
388 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
389 {
390 Sg_device *sdp;
391 Sg_fd *sfp;
392 Sg_request *srp;
393 int req_pack_id = -1;
394 sg_io_hdr_t *hp;
395 struct sg_header *old_hdr = NULL;
396 int retval = 0;
397
398 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
399 return -ENXIO;
400 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
401 "sg_read: count=%d\n", (int) count));
402
403 if (!access_ok(VERIFY_WRITE, buf, count))
404 return -EFAULT;
405 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
406 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
407 if (!old_hdr)
408 return -ENOMEM;
409 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
410 retval = -EFAULT;
411 goto free_old_hdr;
412 }
413 if (old_hdr->reply_len < 0) {
414 if (count >= SZ_SG_IO_HDR) {
415 sg_io_hdr_t *new_hdr;
416 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
417 if (!new_hdr) {
418 retval = -ENOMEM;
419 goto free_old_hdr;
420 }
421 retval =__copy_from_user
422 (new_hdr, buf, SZ_SG_IO_HDR);
423 req_pack_id = new_hdr->pack_id;
424 kfree(new_hdr);
425 if (retval) {
426 retval = -EFAULT;
427 goto free_old_hdr;
428 }
429 }
430 } else
431 req_pack_id = old_hdr->pack_id;
432 }
433 srp = sg_get_rq_mark(sfp, req_pack_id);
434 if (!srp) { /* now wait on packet to arrive */
435 if (atomic_read(&sdp->detaching)) {
436 retval = -ENODEV;
437 goto free_old_hdr;
438 }
439 if (filp->f_flags & O_NONBLOCK) {
440 retval = -EAGAIN;
441 goto free_old_hdr;
442 }
443 retval = wait_event_interruptible(sfp->read_wait,
444 (atomic_read(&sdp->detaching) ||
445 (srp = sg_get_rq_mark(sfp, req_pack_id))));
446 if (atomic_read(&sdp->detaching)) {
447 retval = -ENODEV;
448 goto free_old_hdr;
449 }
450 if (retval) {
451 /* -ERESTARTSYS as signal hit process */
452 goto free_old_hdr;
453 }
454 }
455 if (srp->header.interface_id != '\0') {
456 retval = sg_new_read(sfp, buf, count, srp);
457 goto free_old_hdr;
458 }
459
460 hp = &srp->header;
461 if (old_hdr == NULL) {
462 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
463 if (! old_hdr) {
464 retval = -ENOMEM;
465 goto free_old_hdr;
466 }
467 }
468 memset(old_hdr, 0, SZ_SG_HEADER);
469 old_hdr->reply_len = (int) hp->timeout;
470 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
471 old_hdr->pack_id = hp->pack_id;
472 old_hdr->twelve_byte =
473 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
474 old_hdr->target_status = hp->masked_status;
475 old_hdr->host_status = hp->host_status;
476 old_hdr->driver_status = hp->driver_status;
477 if ((CHECK_CONDITION & hp->masked_status) ||
478 (DRIVER_SENSE & hp->driver_status))
479 memcpy(old_hdr->sense_buffer, srp->sense_b,
480 sizeof (old_hdr->sense_buffer));
481 switch (hp->host_status) {
482 /* This setup of 'result' is for backward compatibility and is best
483 ignored by the user who should use target, host + driver status */
484 case DID_OK:
485 case DID_PASSTHROUGH:
486 case DID_SOFT_ERROR:
487 old_hdr->result = 0;
488 break;
489 case DID_NO_CONNECT:
490 case DID_BUS_BUSY:
491 case DID_TIME_OUT:
492 old_hdr->result = EBUSY;
493 break;
494 case DID_BAD_TARGET:
495 case DID_ABORT:
496 case DID_PARITY:
497 case DID_RESET:
498 case DID_BAD_INTR:
499 old_hdr->result = EIO;
500 break;
501 case DID_ERROR:
502 old_hdr->result = (srp->sense_b[0] == 0 &&
503 hp->masked_status == GOOD) ? 0 : EIO;
504 break;
505 default:
506 old_hdr->result = EIO;
507 break;
508 }
509
510 /* Now copy the result back to the user buffer. */
511 if (count >= SZ_SG_HEADER) {
512 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
513 retval = -EFAULT;
514 goto free_old_hdr;
515 }
516 buf += SZ_SG_HEADER;
517 if (count > old_hdr->reply_len)
518 count = old_hdr->reply_len;
519 if (count > SZ_SG_HEADER) {
520 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
521 retval = -EFAULT;
522 goto free_old_hdr;
523 }
524 }
525 } else
526 count = (old_hdr->result == 0) ? 0 : -EIO;
527 sg_finish_rem_req(srp);
528 retval = count;
529 free_old_hdr:
530 kfree(old_hdr);
531 return retval;
532 }
533
534 static ssize_t
535 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
536 {
537 sg_io_hdr_t *hp = &srp->header;
538 int err = 0, err2;
539 int len;
540
541 if (count < SZ_SG_IO_HDR) {
542 err = -EINVAL;
543 goto err_out;
544 }
545 hp->sb_len_wr = 0;
546 if ((hp->mx_sb_len > 0) && hp->sbp) {
547 if ((CHECK_CONDITION & hp->masked_status) ||
548 (DRIVER_SENSE & hp->driver_status)) {
549 int sb_len = SCSI_SENSE_BUFFERSIZE;
550 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
551 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
552 len = (len > sb_len) ? sb_len : len;
553 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
554 err = -EFAULT;
555 goto err_out;
556 }
557 hp->sb_len_wr = len;
558 }
559 }
560 if (hp->masked_status || hp->host_status || hp->driver_status)
561 hp->info |= SG_INFO_CHECK;
562 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
563 err = -EFAULT;
564 goto err_out;
565 }
566 err_out:
567 err2 = sg_finish_rem_req(srp);
568 return err ? : err2 ? : count;
569 }
570
571 static ssize_t
572 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
573 {
574 int mxsize, cmd_size, k;
575 int input_size, blocking;
576 unsigned char opcode;
577 Sg_device *sdp;
578 Sg_fd *sfp;
579 Sg_request *srp;
580 struct sg_header old_hdr;
581 sg_io_hdr_t *hp;
582 unsigned char cmnd[SG_MAX_CDB_SIZE];
583
584 if (unlikely(segment_eq(get_fs(), KERNEL_DS)))
585 return -EINVAL;
586
587 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
588 return -ENXIO;
589 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
590 "sg_write: count=%d\n", (int) count));
591 if (atomic_read(&sdp->detaching))
592 return -ENODEV;
593 if (!((filp->f_flags & O_NONBLOCK) ||
594 scsi_block_when_processing_errors(sdp->device)))
595 return -ENXIO;
596
597 if (!access_ok(VERIFY_READ, buf, count))
598 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
599 if (count < SZ_SG_HEADER)
600 return -EIO;
601 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
602 return -EFAULT;
603 blocking = !(filp->f_flags & O_NONBLOCK);
604 if (old_hdr.reply_len < 0)
605 return sg_new_write(sfp, filp, buf, count,
606 blocking, 0, 0, NULL);
607 if (count < (SZ_SG_HEADER + 6))
608 return -EIO; /* The minimum scsi command length is 6 bytes. */
609
610 if (!(srp = sg_add_request(sfp))) {
611 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
612 "sg_write: queue full\n"));
613 return -EDOM;
614 }
615 buf += SZ_SG_HEADER;
616 __get_user(opcode, buf);
617 if (sfp->next_cmd_len > 0) {
618 cmd_size = sfp->next_cmd_len;
619 sfp->next_cmd_len = 0; /* reset so only this write() effected */
620 } else {
621 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
622 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
623 cmd_size = 12;
624 }
625 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
626 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
627 /* Determine buffer size. */
628 input_size = count - cmd_size;
629 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
630 mxsize -= SZ_SG_HEADER;
631 input_size -= SZ_SG_HEADER;
632 if (input_size < 0) {
633 sg_remove_request(sfp, srp);
634 return -EIO; /* User did not pass enough bytes for this command. */
635 }
636 hp = &srp->header;
637 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
638 hp->cmd_len = (unsigned char) cmd_size;
639 hp->iovec_count = 0;
640 hp->mx_sb_len = 0;
641 if (input_size > 0)
642 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
643 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
644 else
645 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
646 hp->dxfer_len = mxsize;
647 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
648 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
649 hp->dxferp = (char __user *)buf + cmd_size;
650 else
651 hp->dxferp = NULL;
652 hp->sbp = NULL;
653 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
654 hp->flags = input_size; /* structure abuse ... */
655 hp->pack_id = old_hdr.pack_id;
656 hp->usr_ptr = NULL;
657 if (__copy_from_user(cmnd, buf, cmd_size))
658 return -EFAULT;
659 /*
660 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
661 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
662 * is a non-zero input_size, so emit a warning.
663 */
664 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
665 static char cmd[TASK_COMM_LEN];
666 if (strcmp(current->comm, cmd)) {
667 printk_ratelimited(KERN_WARNING
668 "sg_write: data in/out %d/%d bytes "
669 "for SCSI command 0x%x-- guessing "
670 "data in;\n program %s not setting "
671 "count and/or reply_len properly\n",
672 old_hdr.reply_len - (int)SZ_SG_HEADER,
673 input_size, (unsigned int) cmnd[0],
674 current->comm);
675 strcpy(cmd, current->comm);
676 }
677 }
678 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
679 return (k < 0) ? k : count;
680 }
681
682 static ssize_t
683 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
684 size_t count, int blocking, int read_only, int sg_io_owned,
685 Sg_request **o_srp)
686 {
687 int k;
688 Sg_request *srp;
689 sg_io_hdr_t *hp;
690 unsigned char cmnd[SG_MAX_CDB_SIZE];
691 int timeout;
692 unsigned long ul_timeout;
693
694 if (count < SZ_SG_IO_HDR)
695 return -EINVAL;
696 if (!access_ok(VERIFY_READ, buf, count))
697 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
698
699 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
700 if (!(srp = sg_add_request(sfp))) {
701 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
702 "sg_new_write: queue full\n"));
703 return -EDOM;
704 }
705 srp->sg_io_owned = sg_io_owned;
706 hp = &srp->header;
707 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
708 sg_remove_request(sfp, srp);
709 return -EFAULT;
710 }
711 if (hp->interface_id != 'S') {
712 sg_remove_request(sfp, srp);
713 return -ENOSYS;
714 }
715 if (hp->flags & SG_FLAG_MMAP_IO) {
716 if (hp->dxfer_len > sfp->reserve.bufflen) {
717 sg_remove_request(sfp, srp);
718 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
719 }
720 if (hp->flags & SG_FLAG_DIRECT_IO) {
721 sg_remove_request(sfp, srp);
722 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
723 }
724 if (sg_res_in_use(sfp)) {
725 sg_remove_request(sfp, srp);
726 return -EBUSY; /* reserve buffer already being used */
727 }
728 }
729 ul_timeout = msecs_to_jiffies(srp->header.timeout);
730 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
731 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
732 sg_remove_request(sfp, srp);
733 return -EMSGSIZE;
734 }
735 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
736 sg_remove_request(sfp, srp);
737 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
738 }
739 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
740 sg_remove_request(sfp, srp);
741 return -EFAULT;
742 }
743 if (read_only && sg_allow_access(file, cmnd)) {
744 sg_remove_request(sfp, srp);
745 return -EPERM;
746 }
747 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
748 if (k < 0)
749 return k;
750 if (o_srp)
751 *o_srp = srp;
752 return count;
753 }
754
755 static int
756 sg_common_write(Sg_fd * sfp, Sg_request * srp,
757 unsigned char *cmnd, int timeout, int blocking)
758 {
759 int k, at_head;
760 Sg_device *sdp = sfp->parentdp;
761 sg_io_hdr_t *hp = &srp->header;
762
763 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
764 hp->status = 0;
765 hp->masked_status = 0;
766 hp->msg_status = 0;
767 hp->info = 0;
768 hp->host_status = 0;
769 hp->driver_status = 0;
770 hp->resid = 0;
771 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
772 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
773 (int) cmnd[0], (int) hp->cmd_len));
774
775 k = sg_start_req(srp, cmnd);
776 if (k) {
777 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
778 "sg_common_write: start_req err=%d\n", k));
779 sg_finish_rem_req(srp);
780 return k; /* probably out of space --> ENOMEM */
781 }
782 if (atomic_read(&sdp->detaching)) {
783 if (srp->bio) {
784 if (srp->rq->cmd != srp->rq->__cmd)
785 kfree(srp->rq->cmd);
786
787 blk_end_request_all(srp->rq, -EIO);
788 srp->rq = NULL;
789 }
790
791 sg_finish_rem_req(srp);
792 return -ENODEV;
793 }
794
795 hp->duration = jiffies_to_msecs(jiffies);
796 if (hp->interface_id != '\0' && /* v3 (or later) interface */
797 (SG_FLAG_Q_AT_TAIL & hp->flags))
798 at_head = 0;
799 else
800 at_head = 1;
801
802 srp->rq->timeout = timeout;
803 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
804 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
805 srp->rq, at_head, sg_rq_end_io);
806 return 0;
807 }
808
809 static int srp_done(Sg_fd *sfp, Sg_request *srp)
810 {
811 unsigned long flags;
812 int ret;
813
814 read_lock_irqsave(&sfp->rq_list_lock, flags);
815 ret = srp->done;
816 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
817 return ret;
818 }
819
820 static int max_sectors_bytes(struct request_queue *q)
821 {
822 unsigned int max_sectors = queue_max_sectors(q);
823
824 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
825
826 return max_sectors << 9;
827 }
828
829 static long
830 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
831 {
832 void __user *p = (void __user *)arg;
833 int __user *ip = p;
834 int result, val, read_only;
835 Sg_device *sdp;
836 Sg_fd *sfp;
837 Sg_request *srp;
838 unsigned long iflags;
839
840 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
841 return -ENXIO;
842
843 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
844 "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
845 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
846
847 switch (cmd_in) {
848 case SG_IO:
849 if (atomic_read(&sdp->detaching))
850 return -ENODEV;
851 if (!scsi_block_when_processing_errors(sdp->device))
852 return -ENXIO;
853 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
854 return -EFAULT;
855 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
856 1, read_only, 1, &srp);
857 if (result < 0)
858 return result;
859 result = wait_event_interruptible(sfp->read_wait,
860 (srp_done(sfp, srp) || atomic_read(&sdp->detaching)));
861 if (atomic_read(&sdp->detaching))
862 return -ENODEV;
863 write_lock_irq(&sfp->rq_list_lock);
864 if (srp->done) {
865 srp->done = 2;
866 write_unlock_irq(&sfp->rq_list_lock);
867 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
868 return (result < 0) ? result : 0;
869 }
870 srp->orphan = 1;
871 write_unlock_irq(&sfp->rq_list_lock);
872 return result; /* -ERESTARTSYS because signal hit process */
873 case SG_SET_TIMEOUT:
874 result = get_user(val, ip);
875 if (result)
876 return result;
877 if (val < 0)
878 return -EIO;
879 if (val >= mult_frac((s64)INT_MAX, USER_HZ, HZ))
880 val = min_t(s64, mult_frac((s64)INT_MAX, USER_HZ, HZ),
881 INT_MAX);
882 sfp->timeout_user = val;
883 sfp->timeout = mult_frac(val, HZ, USER_HZ);
884
885 return 0;
886 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
887 /* strange ..., for backward compatibility */
888 return sfp->timeout_user;
889 case SG_SET_FORCE_LOW_DMA:
890 result = get_user(val, ip);
891 if (result)
892 return result;
893 if (val) {
894 sfp->low_dma = 1;
895 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
896 val = (int) sfp->reserve.bufflen;
897 sg_remove_scat(sfp, &sfp->reserve);
898 sg_build_reserve(sfp, val);
899 }
900 } else {
901 if (atomic_read(&sdp->detaching))
902 return -ENODEV;
903 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
904 }
905 return 0;
906 case SG_GET_LOW_DMA:
907 return put_user((int) sfp->low_dma, ip);
908 case SG_GET_SCSI_ID:
909 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
910 return -EFAULT;
911 else {
912 sg_scsi_id_t __user *sg_idp = p;
913
914 if (atomic_read(&sdp->detaching))
915 return -ENODEV;
916 __put_user((int) sdp->device->host->host_no,
917 &sg_idp->host_no);
918 __put_user((int) sdp->device->channel,
919 &sg_idp->channel);
920 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
921 __put_user((int) sdp->device->lun, &sg_idp->lun);
922 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
923 __put_user((short) sdp->device->host->cmd_per_lun,
924 &sg_idp->h_cmd_per_lun);
925 __put_user((short) sdp->device->queue_depth,
926 &sg_idp->d_queue_depth);
927 __put_user(0, &sg_idp->unused[0]);
928 __put_user(0, &sg_idp->unused[1]);
929 return 0;
930 }
931 case SG_SET_FORCE_PACK_ID:
932 result = get_user(val, ip);
933 if (result)
934 return result;
935 sfp->force_packid = val ? 1 : 0;
936 return 0;
937 case SG_GET_PACK_ID:
938 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
939 return -EFAULT;
940 read_lock_irqsave(&sfp->rq_list_lock, iflags);
941 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
942 if ((1 == srp->done) && (!srp->sg_io_owned)) {
943 read_unlock_irqrestore(&sfp->rq_list_lock,
944 iflags);
945 __put_user(srp->header.pack_id, ip);
946 return 0;
947 }
948 }
949 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
950 __put_user(-1, ip);
951 return 0;
952 case SG_GET_NUM_WAITING:
953 read_lock_irqsave(&sfp->rq_list_lock, iflags);
954 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
955 if ((1 == srp->done) && (!srp->sg_io_owned))
956 ++val;
957 }
958 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
959 return put_user(val, ip);
960 case SG_GET_SG_TABLESIZE:
961 return put_user(sdp->sg_tablesize, ip);
962 case SG_SET_RESERVED_SIZE:
963 result = get_user(val, ip);
964 if (result)
965 return result;
966 if (val < 0)
967 return -EINVAL;
968 val = min_t(int, val,
969 max_sectors_bytes(sdp->device->request_queue));
970 if (val != sfp->reserve.bufflen) {
971 if (sg_res_in_use(sfp) || sfp->mmap_called)
972 return -EBUSY;
973 sg_remove_scat(sfp, &sfp->reserve);
974 sg_build_reserve(sfp, val);
975 }
976 return 0;
977 case SG_GET_RESERVED_SIZE:
978 val = min_t(int, sfp->reserve.bufflen,
979 max_sectors_bytes(sdp->device->request_queue));
980 return put_user(val, ip);
981 case SG_SET_COMMAND_Q:
982 result = get_user(val, ip);
983 if (result)
984 return result;
985 sfp->cmd_q = val ? 1 : 0;
986 return 0;
987 case SG_GET_COMMAND_Q:
988 return put_user((int) sfp->cmd_q, ip);
989 case SG_SET_KEEP_ORPHAN:
990 result = get_user(val, ip);
991 if (result)
992 return result;
993 sfp->keep_orphan = val;
994 return 0;
995 case SG_GET_KEEP_ORPHAN:
996 return put_user((int) sfp->keep_orphan, ip);
997 case SG_NEXT_CMD_LEN:
998 result = get_user(val, ip);
999 if (result)
1000 return result;
1001 if (val > SG_MAX_CDB_SIZE)
1002 return -ENOMEM;
1003 sfp->next_cmd_len = (val > 0) ? val : 0;
1004 return 0;
1005 case SG_GET_VERSION_NUM:
1006 return put_user(sg_version_num, ip);
1007 case SG_GET_ACCESS_COUNT:
1008 /* faked - we don't have a real access count anymore */
1009 val = (sdp->device ? 1 : 0);
1010 return put_user(val, ip);
1011 case SG_GET_REQUEST_TABLE:
1012 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1013 return -EFAULT;
1014 else {
1015 sg_req_info_t *rinfo;
1016 unsigned int ms;
1017
1018 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1019 GFP_KERNEL);
1020 if (!rinfo)
1021 return -ENOMEM;
1022 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1023 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1024 ++val, srp = srp ? srp->nextrp : srp) {
1025 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1026 if (srp) {
1027 rinfo[val].req_state = srp->done + 1;
1028 rinfo[val].problem =
1029 srp->header.masked_status &
1030 srp->header.host_status &
1031 srp->header.driver_status;
1032 if (srp->done)
1033 rinfo[val].duration =
1034 srp->header.duration;
1035 else {
1036 ms = jiffies_to_msecs(jiffies);
1037 rinfo[val].duration =
1038 (ms > srp->header.duration) ?
1039 (ms - srp->header.duration) : 0;
1040 }
1041 rinfo[val].orphan = srp->orphan;
1042 rinfo[val].sg_io_owned =
1043 srp->sg_io_owned;
1044 rinfo[val].pack_id =
1045 srp->header.pack_id;
1046 rinfo[val].usr_ptr =
1047 srp->header.usr_ptr;
1048 }
1049 }
1050 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1051 result = __copy_to_user(p, rinfo,
1052 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1053 result = result ? -EFAULT : 0;
1054 kfree(rinfo);
1055 return result;
1056 }
1057 case SG_EMULATED_HOST:
1058 if (atomic_read(&sdp->detaching))
1059 return -ENODEV;
1060 return put_user(sdp->device->host->hostt->emulated, ip);
1061 case SCSI_IOCTL_SEND_COMMAND:
1062 if (atomic_read(&sdp->detaching))
1063 return -ENODEV;
1064 if (read_only) {
1065 unsigned char opcode = WRITE_6;
1066 Scsi_Ioctl_Command __user *siocp = p;
1067
1068 if (copy_from_user(&opcode, siocp->data, 1))
1069 return -EFAULT;
1070 if (sg_allow_access(filp, &opcode))
1071 return -EPERM;
1072 }
1073 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1074 case SG_SET_DEBUG:
1075 result = get_user(val, ip);
1076 if (result)
1077 return result;
1078 sdp->sgdebug = (char) val;
1079 return 0;
1080 case BLKSECTGET:
1081 return put_user(max_sectors_bytes(sdp->device->request_queue),
1082 ip);
1083 case BLKTRACESETUP:
1084 return blk_trace_setup(sdp->device->request_queue,
1085 sdp->disk->disk_name,
1086 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1087 NULL,
1088 (char *)arg);
1089 case BLKTRACESTART:
1090 return blk_trace_startstop(sdp->device->request_queue, 1);
1091 case BLKTRACESTOP:
1092 return blk_trace_startstop(sdp->device->request_queue, 0);
1093 case BLKTRACETEARDOWN:
1094 return blk_trace_remove(sdp->device->request_queue);
1095 case SCSI_IOCTL_GET_IDLUN:
1096 case SCSI_IOCTL_GET_BUS_NUMBER:
1097 case SCSI_IOCTL_PROBE_HOST:
1098 case SG_GET_TRANSFORM:
1099 case SG_SCSI_RESET:
1100 if (atomic_read(&sdp->detaching))
1101 return -ENODEV;
1102 break;
1103 default:
1104 if (read_only)
1105 return -EPERM; /* don't know so take safe approach */
1106 break;
1107 }
1108
1109 result = scsi_ioctl_block_when_processing_errors(sdp->device,
1110 cmd_in, filp->f_flags & O_NDELAY);
1111 if (result)
1112 return result;
1113 return scsi_ioctl(sdp->device, cmd_in, p);
1114 }
1115
1116 #ifdef CONFIG_COMPAT
1117 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1118 {
1119 Sg_device *sdp;
1120 Sg_fd *sfp;
1121 struct scsi_device *sdev;
1122
1123 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1124 return -ENXIO;
1125
1126 sdev = sdp->device;
1127 if (sdev->host->hostt->compat_ioctl) {
1128 int ret;
1129
1130 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1131
1132 return ret;
1133 }
1134
1135 return -ENOIOCTLCMD;
1136 }
1137 #endif
1138
1139 static unsigned int
1140 sg_poll(struct file *filp, poll_table * wait)
1141 {
1142 unsigned int res = 0;
1143 Sg_device *sdp;
1144 Sg_fd *sfp;
1145 Sg_request *srp;
1146 int count = 0;
1147 unsigned long iflags;
1148
1149 sfp = filp->private_data;
1150 if (!sfp)
1151 return POLLERR;
1152 sdp = sfp->parentdp;
1153 if (!sdp)
1154 return POLLERR;
1155 poll_wait(filp, &sfp->read_wait, wait);
1156 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1157 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1158 /* if any read waiting, flag it */
1159 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1160 res = POLLIN | POLLRDNORM;
1161 ++count;
1162 }
1163 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1164
1165 if (atomic_read(&sdp->detaching))
1166 res |= POLLHUP;
1167 else if (!sfp->cmd_q) {
1168 if (0 == count)
1169 res |= POLLOUT | POLLWRNORM;
1170 } else if (count < SG_MAX_QUEUE)
1171 res |= POLLOUT | POLLWRNORM;
1172 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1173 "sg_poll: res=0x%x\n", (int) res));
1174 return res;
1175 }
1176
1177 static int
1178 sg_fasync(int fd, struct file *filp, int mode)
1179 {
1180 Sg_device *sdp;
1181 Sg_fd *sfp;
1182
1183 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1184 return -ENXIO;
1185 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1186 "sg_fasync: mode=%d\n", mode));
1187
1188 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1189 }
1190
1191 static int
1192 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1193 {
1194 Sg_fd *sfp;
1195 unsigned long offset, len, sa;
1196 Sg_scatter_hold *rsv_schp;
1197 int k, length;
1198
1199 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1200 return VM_FAULT_SIGBUS;
1201 rsv_schp = &sfp->reserve;
1202 offset = vmf->pgoff << PAGE_SHIFT;
1203 if (offset >= rsv_schp->bufflen)
1204 return VM_FAULT_SIGBUS;
1205 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1206 "sg_vma_fault: offset=%lu, scatg=%d\n",
1207 offset, rsv_schp->k_use_sg));
1208 sa = vma->vm_start;
1209 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1210 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1211 len = vma->vm_end - sa;
1212 len = (len < length) ? len : length;
1213 if (offset < len) {
1214 struct page *page = nth_page(rsv_schp->pages[k],
1215 offset >> PAGE_SHIFT);
1216 get_page(page); /* increment page count */
1217 vmf->page = page;
1218 return 0; /* success */
1219 }
1220 sa += len;
1221 offset -= len;
1222 }
1223
1224 return VM_FAULT_SIGBUS;
1225 }
1226
1227 static const struct vm_operations_struct sg_mmap_vm_ops = {
1228 .fault = sg_vma_fault,
1229 };
1230
1231 static int
1232 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1233 {
1234 Sg_fd *sfp;
1235 unsigned long req_sz, len, sa;
1236 Sg_scatter_hold *rsv_schp;
1237 int k, length;
1238
1239 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1240 return -ENXIO;
1241 req_sz = vma->vm_end - vma->vm_start;
1242 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
1243 "sg_mmap starting, vm_start=%p, len=%d\n",
1244 (void *) vma->vm_start, (int) req_sz));
1245 if (vma->vm_pgoff)
1246 return -EINVAL; /* want no offset */
1247 rsv_schp = &sfp->reserve;
1248 if (req_sz > rsv_schp->bufflen)
1249 return -ENOMEM; /* cannot map more than reserved buffer */
1250
1251 sa = vma->vm_start;
1252 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1253 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1254 len = vma->vm_end - sa;
1255 len = (len < length) ? len : length;
1256 sa += len;
1257 }
1258
1259 sfp->mmap_called = 1;
1260 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1261 vma->vm_private_data = sfp;
1262 vma->vm_ops = &sg_mmap_vm_ops;
1263 return 0;
1264 }
1265
1266 static void
1267 sg_rq_end_io_usercontext(struct work_struct *work)
1268 {
1269 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1270 struct sg_fd *sfp = srp->parentfp;
1271
1272 sg_finish_rem_req(srp);
1273 kref_put(&sfp->f_ref, sg_remove_sfp);
1274 }
1275
1276 /*
1277 * This function is a "bottom half" handler that is called by the mid
1278 * level when a command is completed (or has failed).
1279 */
1280 static void
1281 sg_rq_end_io(struct request *rq, int uptodate)
1282 {
1283 struct sg_request *srp = rq->end_io_data;
1284 Sg_device *sdp;
1285 Sg_fd *sfp;
1286 unsigned long iflags;
1287 unsigned int ms;
1288 char *sense;
1289 int result, resid, done = 1;
1290
1291 if (WARN_ON(srp->done != 0))
1292 return;
1293
1294 sfp = srp->parentfp;
1295 if (WARN_ON(sfp == NULL))
1296 return;
1297
1298 sdp = sfp->parentdp;
1299 if (unlikely(atomic_read(&sdp->detaching)))
1300 pr_info("%s: device detaching\n", __func__);
1301
1302 sense = rq->sense;
1303 result = rq->errors;
1304 resid = rq->resid_len;
1305
1306 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
1307 "sg_cmd_done: pack_id=%d, res=0x%x\n",
1308 srp->header.pack_id, result));
1309 srp->header.resid = resid;
1310 ms = jiffies_to_msecs(jiffies);
1311 srp->header.duration = (ms > srp->header.duration) ?
1312 (ms - srp->header.duration) : 0;
1313 if (0 != result) {
1314 struct scsi_sense_hdr sshdr;
1315
1316 srp->header.status = 0xff & result;
1317 srp->header.masked_status = status_byte(result);
1318 srp->header.msg_status = msg_byte(result);
1319 srp->header.host_status = host_byte(result);
1320 srp->header.driver_status = driver_byte(result);
1321 if ((sdp->sgdebug > 0) &&
1322 ((CHECK_CONDITION == srp->header.masked_status) ||
1323 (COMMAND_TERMINATED == srp->header.masked_status)))
1324 __scsi_print_sense(sdp->device, __func__, sense,
1325 SCSI_SENSE_BUFFERSIZE);
1326
1327 /* Following if statement is a patch supplied by Eric Youngdale */
1328 if (driver_byte(result) != 0
1329 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1330 && !scsi_sense_is_deferred(&sshdr)
1331 && sshdr.sense_key == UNIT_ATTENTION
1332 && sdp->device->removable) {
1333 /* Detected possible disc change. Set the bit - this */
1334 /* may be used if there are filesystems using this device */
1335 sdp->device->changed = 1;
1336 }
1337 }
1338 /* Rely on write phase to clean out srp status values, so no "else" */
1339
1340 /*
1341 * Free the request as soon as it is complete so that its resources
1342 * can be reused without waiting for userspace to read() the
1343 * result. But keep the associated bio (if any) around until
1344 * blk_rq_unmap_user() can be called from user context.
1345 */
1346 srp->rq = NULL;
1347 if (rq->cmd != rq->__cmd)
1348 kfree(rq->cmd);
1349 __blk_put_request(rq->q, rq);
1350
1351 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1352 if (unlikely(srp->orphan)) {
1353 if (sfp->keep_orphan)
1354 srp->sg_io_owned = 0;
1355 else
1356 done = 0;
1357 }
1358 srp->done = done;
1359 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1360
1361 if (likely(done)) {
1362 /* Now wake up any sg_read() that is waiting for this
1363 * packet.
1364 */
1365 wake_up_interruptible(&sfp->read_wait);
1366 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1367 kref_put(&sfp->f_ref, sg_remove_sfp);
1368 } else {
1369 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1370 schedule_work(&srp->ew.work);
1371 }
1372 }
1373
1374 static const struct file_operations sg_fops = {
1375 .owner = THIS_MODULE,
1376 .read = sg_read,
1377 .write = sg_write,
1378 .poll = sg_poll,
1379 .unlocked_ioctl = sg_ioctl,
1380 #ifdef CONFIG_COMPAT
1381 .compat_ioctl = sg_compat_ioctl,
1382 #endif
1383 .open = sg_open,
1384 .mmap = sg_mmap,
1385 .release = sg_release,
1386 .fasync = sg_fasync,
1387 .llseek = no_llseek,
1388 };
1389
1390 static struct class *sg_sysfs_class;
1391
1392 static int sg_sysfs_valid = 0;
1393
1394 static Sg_device *
1395 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1396 {
1397 struct request_queue *q = scsidp->request_queue;
1398 Sg_device *sdp;
1399 unsigned long iflags;
1400 int error;
1401 u32 k;
1402
1403 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1404 if (!sdp) {
1405 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device "
1406 "failure\n", __func__);
1407 return ERR_PTR(-ENOMEM);
1408 }
1409
1410 idr_preload(GFP_KERNEL);
1411 write_lock_irqsave(&sg_index_lock, iflags);
1412
1413 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1414 if (error < 0) {
1415 if (error == -ENOSPC) {
1416 sdev_printk(KERN_WARNING, scsidp,
1417 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1418 scsidp->type, SG_MAX_DEVS - 1);
1419 error = -ENODEV;
1420 } else {
1421 sdev_printk(KERN_WARNING, scsidp, "%s: idr "
1422 "allocation Sg_device failure: %d\n",
1423 __func__, error);
1424 }
1425 goto out_unlock;
1426 }
1427 k = error;
1428
1429 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
1430 "sg_alloc: dev=%d \n", k));
1431 sprintf(disk->disk_name, "sg%d", k);
1432 disk->first_minor = k;
1433 sdp->disk = disk;
1434 sdp->device = scsidp;
1435 mutex_init(&sdp->open_rel_lock);
1436 INIT_LIST_HEAD(&sdp->sfds);
1437 init_waitqueue_head(&sdp->open_wait);
1438 atomic_set(&sdp->detaching, 0);
1439 rwlock_init(&sdp->sfd_lock);
1440 sdp->sg_tablesize = queue_max_segments(q);
1441 sdp->index = k;
1442 kref_init(&sdp->d_ref);
1443 error = 0;
1444
1445 out_unlock:
1446 write_unlock_irqrestore(&sg_index_lock, iflags);
1447 idr_preload_end();
1448
1449 if (error) {
1450 kfree(sdp);
1451 return ERR_PTR(error);
1452 }
1453 return sdp;
1454 }
1455
1456 static int
1457 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf)
1458 {
1459 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1460 struct gendisk *disk;
1461 Sg_device *sdp = NULL;
1462 struct cdev * cdev = NULL;
1463 int error;
1464 unsigned long iflags;
1465
1466 disk = alloc_disk(1);
1467 if (!disk) {
1468 pr_warn("%s: alloc_disk failed\n", __func__);
1469 return -ENOMEM;
1470 }
1471 disk->major = SCSI_GENERIC_MAJOR;
1472
1473 error = -ENOMEM;
1474 cdev = cdev_alloc();
1475 if (!cdev) {
1476 pr_warn("%s: cdev_alloc failed\n", __func__);
1477 goto out;
1478 }
1479 cdev->owner = THIS_MODULE;
1480 cdev->ops = &sg_fops;
1481
1482 sdp = sg_alloc(disk, scsidp);
1483 if (IS_ERR(sdp)) {
1484 pr_warn("%s: sg_alloc failed\n", __func__);
1485 error = PTR_ERR(sdp);
1486 goto out;
1487 }
1488
1489 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1490 if (error)
1491 goto cdev_add_err;
1492
1493 sdp->cdev = cdev;
1494 if (sg_sysfs_valid) {
1495 struct device *sg_class_member;
1496
1497 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1498 MKDEV(SCSI_GENERIC_MAJOR,
1499 sdp->index),
1500 sdp, "%s", disk->disk_name);
1501 if (IS_ERR(sg_class_member)) {
1502 pr_err("%s: device_create failed\n", __func__);
1503 error = PTR_ERR(sg_class_member);
1504 goto cdev_add_err;
1505 }
1506 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1507 &sg_class_member->kobj, "generic");
1508 if (error)
1509 pr_err("%s: unable to make symlink 'generic' back "
1510 "to sg%d\n", __func__, sdp->index);
1511 } else
1512 pr_warn("%s: sg_sys Invalid\n", __func__);
1513
1514 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d "
1515 "type %d\n", sdp->index, scsidp->type);
1516
1517 dev_set_drvdata(cl_dev, sdp);
1518
1519 return 0;
1520
1521 cdev_add_err:
1522 write_lock_irqsave(&sg_index_lock, iflags);
1523 idr_remove(&sg_index_idr, sdp->index);
1524 write_unlock_irqrestore(&sg_index_lock, iflags);
1525 kfree(sdp);
1526
1527 out:
1528 put_disk(disk);
1529 if (cdev)
1530 cdev_del(cdev);
1531 return error;
1532 }
1533
1534 static void
1535 sg_device_destroy(struct kref *kref)
1536 {
1537 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1538 unsigned long flags;
1539
1540 /* CAUTION! Note that the device can still be found via idr_find()
1541 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1542 * any other cleanup.
1543 */
1544
1545 write_lock_irqsave(&sg_index_lock, flags);
1546 idr_remove(&sg_index_idr, sdp->index);
1547 write_unlock_irqrestore(&sg_index_lock, flags);
1548
1549 SCSI_LOG_TIMEOUT(3,
1550 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
1551
1552 put_disk(sdp->disk);
1553 kfree(sdp);
1554 }
1555
1556 static void
1557 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf)
1558 {
1559 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1560 Sg_device *sdp = dev_get_drvdata(cl_dev);
1561 unsigned long iflags;
1562 Sg_fd *sfp;
1563 int val;
1564
1565 if (!sdp)
1566 return;
1567 /* want sdp->detaching non-zero as soon as possible */
1568 val = atomic_inc_return(&sdp->detaching);
1569 if (val > 1)
1570 return; /* only want to do following once per device */
1571
1572 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
1573 "%s\n", __func__));
1574
1575 read_lock_irqsave(&sdp->sfd_lock, iflags);
1576 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1577 wake_up_interruptible_all(&sfp->read_wait);
1578 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1579 }
1580 wake_up_interruptible_all(&sdp->open_wait);
1581 read_unlock_irqrestore(&sdp->sfd_lock, iflags);
1582
1583 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1584 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1585 cdev_del(sdp->cdev);
1586 sdp->cdev = NULL;
1587
1588 kref_put(&sdp->d_ref, sg_device_destroy);
1589 }
1590
1591 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1592 module_param_named(def_reserved_size, def_reserved_size, int,
1593 S_IRUGO | S_IWUSR);
1594 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1595
1596 MODULE_AUTHOR("Douglas Gilbert");
1597 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1598 MODULE_LICENSE("GPL");
1599 MODULE_VERSION(SG_VERSION_STR);
1600 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1601
1602 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1603 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1604 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1605 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1606
1607 static int __init
1608 init_sg(void)
1609 {
1610 int rc;
1611
1612 if (scatter_elem_sz < PAGE_SIZE) {
1613 scatter_elem_sz = PAGE_SIZE;
1614 scatter_elem_sz_prev = scatter_elem_sz;
1615 }
1616 if (def_reserved_size >= 0)
1617 sg_big_buff = def_reserved_size;
1618 else
1619 def_reserved_size = sg_big_buff;
1620
1621 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1622 SG_MAX_DEVS, "sg");
1623 if (rc)
1624 return rc;
1625 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1626 if ( IS_ERR(sg_sysfs_class) ) {
1627 rc = PTR_ERR(sg_sysfs_class);
1628 goto err_out;
1629 }
1630 sg_sysfs_valid = 1;
1631 rc = scsi_register_interface(&sg_interface);
1632 if (0 == rc) {
1633 #ifdef CONFIG_SCSI_PROC_FS
1634 sg_proc_init();
1635 #endif /* CONFIG_SCSI_PROC_FS */
1636 return 0;
1637 }
1638 class_destroy(sg_sysfs_class);
1639 err_out:
1640 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1641 return rc;
1642 }
1643
1644 static void __exit
1645 exit_sg(void)
1646 {
1647 #ifdef CONFIG_SCSI_PROC_FS
1648 sg_proc_cleanup();
1649 #endif /* CONFIG_SCSI_PROC_FS */
1650 scsi_unregister_interface(&sg_interface);
1651 class_destroy(sg_sysfs_class);
1652 sg_sysfs_valid = 0;
1653 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1654 SG_MAX_DEVS);
1655 idr_destroy(&sg_index_idr);
1656 }
1657
1658 static int
1659 sg_start_req(Sg_request *srp, unsigned char *cmd)
1660 {
1661 int res;
1662 struct request *rq;
1663 Sg_fd *sfp = srp->parentfp;
1664 sg_io_hdr_t *hp = &srp->header;
1665 int dxfer_len = (int) hp->dxfer_len;
1666 int dxfer_dir = hp->dxfer_direction;
1667 unsigned int iov_count = hp->iovec_count;
1668 Sg_scatter_hold *req_schp = &srp->data;
1669 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1670 struct request_queue *q = sfp->parentdp->device->request_queue;
1671 struct rq_map_data *md, map_data;
1672 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1673 unsigned char *long_cmdp = NULL;
1674
1675 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1676 "sg_start_req: dxfer_len=%d\n",
1677 dxfer_len));
1678
1679 if (hp->cmd_len > BLK_MAX_CDB) {
1680 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
1681 if (!long_cmdp)
1682 return -ENOMEM;
1683 }
1684
1685 /*
1686 * NOTE
1687 *
1688 * With scsi-mq enabled, there are a fixed number of preallocated
1689 * requests equal in number to shost->can_queue. If all of the
1690 * preallocated requests are already in use, then using GFP_ATOMIC with
1691 * blk_get_request() will return -EWOULDBLOCK, whereas using GFP_KERNEL
1692 * will cause blk_get_request() to sleep until an active command
1693 * completes, freeing up a request. Neither option is ideal, but
1694 * GFP_KERNEL is the better choice to prevent userspace from getting an
1695 * unexpected EWOULDBLOCK.
1696 *
1697 * With scsi-mq disabled, blk_get_request() with GFP_KERNEL usually
1698 * does not sleep except under memory pressure.
1699 */
1700 rq = blk_get_request(q, rw, GFP_KERNEL);
1701 if (IS_ERR(rq)) {
1702 kfree(long_cmdp);
1703 return PTR_ERR(rq);
1704 }
1705
1706 blk_rq_set_block_pc(rq);
1707
1708 if (hp->cmd_len > BLK_MAX_CDB)
1709 rq->cmd = long_cmdp;
1710 memcpy(rq->cmd, cmd, hp->cmd_len);
1711 rq->cmd_len = hp->cmd_len;
1712
1713 srp->rq = rq;
1714 rq->end_io_data = srp;
1715 rq->sense = srp->sense_b;
1716 rq->retries = SG_DEFAULT_RETRIES;
1717
1718 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1719 return 0;
1720
1721 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1722 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1723 !sfp->parentdp->device->host->unchecked_isa_dma &&
1724 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1725 md = NULL;
1726 else
1727 md = &map_data;
1728
1729 if (md) {
1730 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1731 sg_link_reserve(sfp, srp, dxfer_len);
1732 else {
1733 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1734 if (res)
1735 return res;
1736 }
1737
1738 md->pages = req_schp->pages;
1739 md->page_order = req_schp->page_order;
1740 md->nr_entries = req_schp->k_use_sg;
1741 md->offset = 0;
1742 md->null_mapped = hp->dxferp ? 0 : 1;
1743 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1744 md->from_user = 1;
1745 else
1746 md->from_user = 0;
1747 }
1748
1749 if (iov_count) {
1750 struct iovec *iov = NULL;
1751 struct iov_iter i;
1752
1753 res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
1754 if (res < 0)
1755 return res;
1756
1757 iov_iter_truncate(&i, hp->dxfer_len);
1758 if (!iov_iter_count(&i)) {
1759 kfree(iov);
1760 return -EINVAL;
1761 }
1762
1763 res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
1764 kfree(iov);
1765 } else
1766 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1767 hp->dxfer_len, GFP_ATOMIC);
1768
1769 if (!res) {
1770 srp->bio = rq->bio;
1771
1772 if (!md) {
1773 req_schp->dio_in_use = 1;
1774 hp->info |= SG_INFO_DIRECT_IO;
1775 }
1776 }
1777 return res;
1778 }
1779
1780 static int
1781 sg_finish_rem_req(Sg_request *srp)
1782 {
1783 int ret = 0;
1784
1785 Sg_fd *sfp = srp->parentfp;
1786 Sg_scatter_hold *req_schp = &srp->data;
1787
1788 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1789 "sg_finish_rem_req: res_used=%d\n",
1790 (int) srp->res_used));
1791 if (srp->bio)
1792 ret = blk_rq_unmap_user(srp->bio);
1793
1794 if (srp->rq) {
1795 if (srp->rq->cmd != srp->rq->__cmd)
1796 kfree(srp->rq->cmd);
1797 blk_put_request(srp->rq);
1798 }
1799
1800 if (srp->res_used)
1801 sg_unlink_reserve(sfp, srp);
1802 else
1803 sg_remove_scat(sfp, req_schp);
1804
1805 sg_remove_request(sfp, srp);
1806
1807 return ret;
1808 }
1809
1810 static int
1811 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1812 {
1813 int sg_bufflen = tablesize * sizeof(struct page *);
1814 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1815
1816 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1817 if (!schp->pages)
1818 return -ENOMEM;
1819 schp->sglist_len = sg_bufflen;
1820 return tablesize; /* number of scat_gath elements allocated */
1821 }
1822
1823 static int
1824 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1825 {
1826 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1827 int sg_tablesize = sfp->parentdp->sg_tablesize;
1828 int blk_size = buff_size, order;
1829 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1830
1831 if (blk_size < 0)
1832 return -EFAULT;
1833 if (0 == blk_size)
1834 ++blk_size; /* don't know why */
1835 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1836 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1837 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1838 "sg_build_indirect: buff_size=%d, blk_size=%d\n",
1839 buff_size, blk_size));
1840
1841 /* N.B. ret_sz carried into this block ... */
1842 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1843 if (mx_sc_elems < 0)
1844 return mx_sc_elems; /* most likely -ENOMEM */
1845
1846 num = scatter_elem_sz;
1847 if (unlikely(num != scatter_elem_sz_prev)) {
1848 if (num < PAGE_SIZE) {
1849 scatter_elem_sz = PAGE_SIZE;
1850 scatter_elem_sz_prev = PAGE_SIZE;
1851 } else
1852 scatter_elem_sz_prev = num;
1853 }
1854
1855 if (sfp->low_dma)
1856 gfp_mask |= GFP_DMA;
1857
1858 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1859 gfp_mask |= __GFP_ZERO;
1860
1861 order = get_order(num);
1862 retry:
1863 ret_sz = 1 << (PAGE_SHIFT + order);
1864
1865 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1866 k++, rem_sz -= ret_sz) {
1867
1868 num = (rem_sz > scatter_elem_sz_prev) ?
1869 scatter_elem_sz_prev : rem_sz;
1870
1871 schp->pages[k] = alloc_pages(gfp_mask, order);
1872 if (!schp->pages[k])
1873 goto out;
1874
1875 if (num == scatter_elem_sz_prev) {
1876 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1877 scatter_elem_sz = ret_sz;
1878 scatter_elem_sz_prev = ret_sz;
1879 }
1880 }
1881
1882 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1883 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
1884 k, num, ret_sz));
1885 } /* end of for loop */
1886
1887 schp->page_order = order;
1888 schp->k_use_sg = k;
1889 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
1890 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
1891 k, rem_sz));
1892
1893 schp->bufflen = blk_size;
1894 if (rem_sz > 0) /* must have failed */
1895 return -ENOMEM;
1896 return 0;
1897 out:
1898 for (i = 0; i < k; i++)
1899 __free_pages(schp->pages[i], order);
1900
1901 if (--order >= 0)
1902 goto retry;
1903
1904 return -ENOMEM;
1905 }
1906
1907 static void
1908 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
1909 {
1910 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1911 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1912 if (schp->pages && schp->sglist_len > 0) {
1913 if (!schp->dio_in_use) {
1914 int k;
1915
1916 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1917 SCSI_LOG_TIMEOUT(5,
1918 sg_printk(KERN_INFO, sfp->parentdp,
1919 "sg_remove_scat: k=%d, pg=0x%p\n",
1920 k, schp->pages[k]));
1921 __free_pages(schp->pages[k], schp->page_order);
1922 }
1923
1924 kfree(schp->pages);
1925 }
1926 }
1927 memset(schp, 0, sizeof (*schp));
1928 }
1929
1930 static int
1931 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1932 {
1933 Sg_scatter_hold *schp = &srp->data;
1934 int k, num;
1935
1936 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
1937 "sg_read_oxfer: num_read_xfer=%d\n",
1938 num_read_xfer));
1939 if ((!outp) || (num_read_xfer <= 0))
1940 return 0;
1941
1942 num = 1 << (PAGE_SHIFT + schp->page_order);
1943 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1944 if (num > num_read_xfer) {
1945 if (__copy_to_user(outp, page_address(schp->pages[k]),
1946 num_read_xfer))
1947 return -EFAULT;
1948 break;
1949 } else {
1950 if (__copy_to_user(outp, page_address(schp->pages[k]),
1951 num))
1952 return -EFAULT;
1953 num_read_xfer -= num;
1954 if (num_read_xfer <= 0)
1955 break;
1956 outp += num;
1957 }
1958 }
1959
1960 return 0;
1961 }
1962
1963 static void
1964 sg_build_reserve(Sg_fd * sfp, int req_size)
1965 {
1966 Sg_scatter_hold *schp = &sfp->reserve;
1967
1968 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1969 "sg_build_reserve: req_size=%d\n", req_size));
1970 do {
1971 if (req_size < PAGE_SIZE)
1972 req_size = PAGE_SIZE;
1973 if (0 == sg_build_indirect(schp, sfp, req_size))
1974 return;
1975 else
1976 sg_remove_scat(sfp, schp);
1977 req_size >>= 1; /* divide by 2 */
1978 } while (req_size > (PAGE_SIZE / 2));
1979 }
1980
1981 static void
1982 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1983 {
1984 Sg_scatter_hold *req_schp = &srp->data;
1985 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1986 int k, num, rem;
1987
1988 srp->res_used = 1;
1989 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
1990 "sg_link_reserve: size=%d\n", size));
1991 rem = size;
1992
1993 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1994 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1995 if (rem <= num) {
1996 req_schp->k_use_sg = k + 1;
1997 req_schp->sglist_len = rsv_schp->sglist_len;
1998 req_schp->pages = rsv_schp->pages;
1999
2000 req_schp->bufflen = size;
2001 req_schp->page_order = rsv_schp->page_order;
2002 break;
2003 } else
2004 rem -= num;
2005 }
2006
2007 if (k >= rsv_schp->k_use_sg)
2008 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
2009 "sg_link_reserve: BAD size\n"));
2010 }
2011
2012 static void
2013 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2014 {
2015 Sg_scatter_hold *req_schp = &srp->data;
2016
2017 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
2018 "sg_unlink_reserve: req->k_use_sg=%d\n",
2019 (int) req_schp->k_use_sg));
2020 req_schp->k_use_sg = 0;
2021 req_schp->bufflen = 0;
2022 req_schp->pages = NULL;
2023 req_schp->page_order = 0;
2024 req_schp->sglist_len = 0;
2025 sfp->save_scat_len = 0;
2026 srp->res_used = 0;
2027 }
2028
2029 static Sg_request *
2030 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2031 {
2032 Sg_request *resp;
2033 unsigned long iflags;
2034
2035 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2036 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2037 /* look for requests that are ready + not SG_IO owned */
2038 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2039 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2040 resp->done = 2; /* guard against other readers */
2041 break;
2042 }
2043 }
2044 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2045 return resp;
2046 }
2047
2048 /* always adds to end of list */
2049 static Sg_request *
2050 sg_add_request(Sg_fd * sfp)
2051 {
2052 int k;
2053 unsigned long iflags;
2054 Sg_request *resp;
2055 Sg_request *rp = sfp->req_arr;
2056
2057 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2058 resp = sfp->headrp;
2059 if (!resp) {
2060 memset(rp, 0, sizeof (Sg_request));
2061 rp->parentfp = sfp;
2062 resp = rp;
2063 sfp->headrp = resp;
2064 } else {
2065 if (0 == sfp->cmd_q)
2066 resp = NULL; /* command queuing disallowed */
2067 else {
2068 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2069 if (!rp->parentfp)
2070 break;
2071 }
2072 if (k < SG_MAX_QUEUE) {
2073 memset(rp, 0, sizeof (Sg_request));
2074 rp->parentfp = sfp;
2075 while (resp->nextrp)
2076 resp = resp->nextrp;
2077 resp->nextrp = rp;
2078 resp = rp;
2079 } else
2080 resp = NULL;
2081 }
2082 }
2083 if (resp) {
2084 resp->nextrp = NULL;
2085 resp->header.duration = jiffies_to_msecs(jiffies);
2086 }
2087 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2088 return resp;
2089 }
2090
2091 /* Return of 1 for found; 0 for not found */
2092 static int
2093 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2094 {
2095 Sg_request *prev_rp;
2096 Sg_request *rp;
2097 unsigned long iflags;
2098 int res = 0;
2099
2100 if ((!sfp) || (!srp) || (!sfp->headrp))
2101 return res;
2102 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2103 prev_rp = sfp->headrp;
2104 if (srp == prev_rp) {
2105 sfp->headrp = prev_rp->nextrp;
2106 prev_rp->parentfp = NULL;
2107 res = 1;
2108 } else {
2109 while ((rp = prev_rp->nextrp)) {
2110 if (srp == rp) {
2111 prev_rp->nextrp = rp->nextrp;
2112 rp->parentfp = NULL;
2113 res = 1;
2114 break;
2115 }
2116 prev_rp = rp;
2117 }
2118 }
2119 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2120 return res;
2121 }
2122
2123 static Sg_fd *
2124 sg_add_sfp(Sg_device * sdp)
2125 {
2126 Sg_fd *sfp;
2127 unsigned long iflags;
2128 int bufflen;
2129
2130 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2131 if (!sfp)
2132 return ERR_PTR(-ENOMEM);
2133
2134 init_waitqueue_head(&sfp->read_wait);
2135 rwlock_init(&sfp->rq_list_lock);
2136
2137 kref_init(&sfp->f_ref);
2138 sfp->timeout = SG_DEFAULT_TIMEOUT;
2139 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2140 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2141 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2142 sdp->device->host->unchecked_isa_dma : 1;
2143 sfp->cmd_q = SG_DEF_COMMAND_Q;
2144 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2145 sfp->parentdp = sdp;
2146 write_lock_irqsave(&sdp->sfd_lock, iflags);
2147 if (atomic_read(&sdp->detaching)) {
2148 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2149 return ERR_PTR(-ENODEV);
2150 }
2151 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2152 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2153 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2154 "sg_add_sfp: sfp=0x%p\n", sfp));
2155 if (unlikely(sg_big_buff != def_reserved_size))
2156 sg_big_buff = def_reserved_size;
2157
2158 bufflen = min_t(int, sg_big_buff,
2159 max_sectors_bytes(sdp->device->request_queue));
2160 sg_build_reserve(sfp, bufflen);
2161 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
2162 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2163 sfp->reserve.bufflen,
2164 sfp->reserve.k_use_sg));
2165
2166 kref_get(&sdp->d_ref);
2167 __module_get(THIS_MODULE);
2168 return sfp;
2169 }
2170
2171 static void
2172 sg_remove_sfp_usercontext(struct work_struct *work)
2173 {
2174 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2175 struct sg_device *sdp = sfp->parentdp;
2176
2177 /* Cleanup any responses which were never read(). */
2178 while (sfp->headrp)
2179 sg_finish_rem_req(sfp->headrp);
2180
2181 if (sfp->reserve.bufflen > 0) {
2182 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2183 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2184 (int) sfp->reserve.bufflen,
2185 (int) sfp->reserve.k_use_sg));
2186 sg_remove_scat(sfp, &sfp->reserve);
2187 }
2188
2189 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
2190 "sg_remove_sfp: sfp=0x%p\n", sfp));
2191 kfree(sfp);
2192
2193 scsi_device_put(sdp->device);
2194 kref_put(&sdp->d_ref, sg_device_destroy);
2195 module_put(THIS_MODULE);
2196 }
2197
2198 static void
2199 sg_remove_sfp(struct kref *kref)
2200 {
2201 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2202 struct sg_device *sdp = sfp->parentdp;
2203 unsigned long iflags;
2204
2205 write_lock_irqsave(&sdp->sfd_lock, iflags);
2206 list_del(&sfp->sfd_siblings);
2207 write_unlock_irqrestore(&sdp->sfd_lock, iflags);
2208
2209 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2210 schedule_work(&sfp->ew.work);
2211 }
2212
2213 static int
2214 sg_res_in_use(Sg_fd * sfp)
2215 {
2216 const Sg_request *srp;
2217 unsigned long iflags;
2218
2219 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2220 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2221 if (srp->res_used)
2222 break;
2223 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2224 return srp ? 1 : 0;
2225 }
2226
2227 #ifdef CONFIG_SCSI_PROC_FS
2228 static int
2229 sg_idr_max_id(int id, void *p, void *data)
2230 {
2231 int *k = data;
2232
2233 if (*k < id)
2234 *k = id;
2235
2236 return 0;
2237 }
2238
2239 static int
2240 sg_last_dev(void)
2241 {
2242 int k = -1;
2243 unsigned long iflags;
2244
2245 read_lock_irqsave(&sg_index_lock, iflags);
2246 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2247 read_unlock_irqrestore(&sg_index_lock, iflags);
2248 return k + 1; /* origin 1 */
2249 }
2250 #endif
2251
2252 /* must be called with sg_index_lock held */
2253 static Sg_device *sg_lookup_dev(int dev)
2254 {
2255 return idr_find(&sg_index_idr, dev);
2256 }
2257
2258 static Sg_device *
2259 sg_get_dev(int dev)
2260 {
2261 struct sg_device *sdp;
2262 unsigned long flags;
2263
2264 read_lock_irqsave(&sg_index_lock, flags);
2265 sdp = sg_lookup_dev(dev);
2266 if (!sdp)
2267 sdp = ERR_PTR(-ENXIO);
2268 else if (atomic_read(&sdp->detaching)) {
2269 /* If sdp->detaching, then the refcount may already be 0, in
2270 * which case it would be a bug to do kref_get().
2271 */
2272 sdp = ERR_PTR(-ENODEV);
2273 } else
2274 kref_get(&sdp->d_ref);
2275 read_unlock_irqrestore(&sg_index_lock, flags);
2276
2277 return sdp;
2278 }
2279
2280 #ifdef CONFIG_SCSI_PROC_FS
2281
2282 static struct proc_dir_entry *sg_proc_sgp = NULL;
2283
2284 static char sg_proc_sg_dirname[] = "scsi/sg";
2285
2286 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2287
2288 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2289 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2290 size_t count, loff_t *off);
2291 static const struct file_operations adio_fops = {
2292 .owner = THIS_MODULE,
2293 .open = sg_proc_single_open_adio,
2294 .read = seq_read,
2295 .llseek = seq_lseek,
2296 .write = sg_proc_write_adio,
2297 .release = single_release,
2298 };
2299
2300 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2301 static ssize_t sg_proc_write_dressz(struct file *filp,
2302 const char __user *buffer, size_t count, loff_t *off);
2303 static const struct file_operations dressz_fops = {
2304 .owner = THIS_MODULE,
2305 .open = sg_proc_single_open_dressz,
2306 .read = seq_read,
2307 .llseek = seq_lseek,
2308 .write = sg_proc_write_dressz,
2309 .release = single_release,
2310 };
2311
2312 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2313 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2314 static const struct file_operations version_fops = {
2315 .owner = THIS_MODULE,
2316 .open = sg_proc_single_open_version,
2317 .read = seq_read,
2318 .llseek = seq_lseek,
2319 .release = single_release,
2320 };
2321
2322 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2323 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2324 static const struct file_operations devhdr_fops = {
2325 .owner = THIS_MODULE,
2326 .open = sg_proc_single_open_devhdr,
2327 .read = seq_read,
2328 .llseek = seq_lseek,
2329 .release = single_release,
2330 };
2331
2332 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2333 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2334 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2335 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2336 static void dev_seq_stop(struct seq_file *s, void *v);
2337 static const struct file_operations dev_fops = {
2338 .owner = THIS_MODULE,
2339 .open = sg_proc_open_dev,
2340 .read = seq_read,
2341 .llseek = seq_lseek,
2342 .release = seq_release,
2343 };
2344 static const struct seq_operations dev_seq_ops = {
2345 .start = dev_seq_start,
2346 .next = dev_seq_next,
2347 .stop = dev_seq_stop,
2348 .show = sg_proc_seq_show_dev,
2349 };
2350
2351 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2352 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2353 static const struct file_operations devstrs_fops = {
2354 .owner = THIS_MODULE,
2355 .open = sg_proc_open_devstrs,
2356 .read = seq_read,
2357 .llseek = seq_lseek,
2358 .release = seq_release,
2359 };
2360 static const struct seq_operations devstrs_seq_ops = {
2361 .start = dev_seq_start,
2362 .next = dev_seq_next,
2363 .stop = dev_seq_stop,
2364 .show = sg_proc_seq_show_devstrs,
2365 };
2366
2367 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2368 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2369 static const struct file_operations debug_fops = {
2370 .owner = THIS_MODULE,
2371 .open = sg_proc_open_debug,
2372 .read = seq_read,
2373 .llseek = seq_lseek,
2374 .release = seq_release,
2375 };
2376 static const struct seq_operations debug_seq_ops = {
2377 .start = dev_seq_start,
2378 .next = dev_seq_next,
2379 .stop = dev_seq_stop,
2380 .show = sg_proc_seq_show_debug,
2381 };
2382
2383
2384 struct sg_proc_leaf {
2385 const char * name;
2386 const struct file_operations * fops;
2387 };
2388
2389 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2390 {"allow_dio", &adio_fops},
2391 {"debug", &debug_fops},
2392 {"def_reserved_size", &dressz_fops},
2393 {"device_hdr", &devhdr_fops},
2394 {"devices", &dev_fops},
2395 {"device_strs", &devstrs_fops},
2396 {"version", &version_fops}
2397 };
2398
2399 static int
2400 sg_proc_init(void)
2401 {
2402 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2403 int k;
2404
2405 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2406 if (!sg_proc_sgp)
2407 return 1;
2408 for (k = 0; k < num_leaves; ++k) {
2409 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2410 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2411 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2412 }
2413 return 0;
2414 }
2415
2416 static void
2417 sg_proc_cleanup(void)
2418 {
2419 int k;
2420 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2421
2422 if (!sg_proc_sgp)
2423 return;
2424 for (k = 0; k < num_leaves; ++k)
2425 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2426 remove_proc_entry(sg_proc_sg_dirname, NULL);
2427 }
2428
2429
2430 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2431 {
2432 seq_printf(s, "%d\n", *((int *)s->private));
2433 return 0;
2434 }
2435
2436 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2437 {
2438 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2439 }
2440
2441 static ssize_t
2442 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2443 size_t count, loff_t *off)
2444 {
2445 int err;
2446 unsigned long num;
2447
2448 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2449 return -EACCES;
2450 err = kstrtoul_from_user(buffer, count, 0, &num);
2451 if (err)
2452 return err;
2453 sg_allow_dio = num ? 1 : 0;
2454 return count;
2455 }
2456
2457 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2458 {
2459 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2460 }
2461
2462 static ssize_t
2463 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2464 size_t count, loff_t *off)
2465 {
2466 int err;
2467 unsigned long k = ULONG_MAX;
2468
2469 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2470 return -EACCES;
2471
2472 err = kstrtoul_from_user(buffer, count, 0, &k);
2473 if (err)
2474 return err;
2475 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2476 sg_big_buff = k;
2477 return count;
2478 }
2479 return -ERANGE;
2480 }
2481
2482 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2483 {
2484 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2485 sg_version_date);
2486 return 0;
2487 }
2488
2489 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2490 {
2491 return single_open(file, sg_proc_seq_show_version, NULL);
2492 }
2493
2494 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2495 {
2496 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n");
2497 return 0;
2498 }
2499
2500 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2501 {
2502 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2503 }
2504
2505 struct sg_proc_deviter {
2506 loff_t index;
2507 size_t max;
2508 };
2509
2510 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2511 {
2512 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2513
2514 s->private = it;
2515 if (! it)
2516 return NULL;
2517
2518 it->index = *pos;
2519 it->max = sg_last_dev();
2520 if (it->index >= it->max)
2521 return NULL;
2522 return it;
2523 }
2524
2525 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2526 {
2527 struct sg_proc_deviter * it = s->private;
2528
2529 *pos = ++it->index;
2530 return (it->index < it->max) ? it : NULL;
2531 }
2532
2533 static void dev_seq_stop(struct seq_file *s, void *v)
2534 {
2535 kfree(s->private);
2536 }
2537
2538 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2539 {
2540 return seq_open(file, &dev_seq_ops);
2541 }
2542
2543 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2544 {
2545 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2546 Sg_device *sdp;
2547 struct scsi_device *scsidp;
2548 unsigned long iflags;
2549
2550 read_lock_irqsave(&sg_index_lock, iflags);
2551 sdp = it ? sg_lookup_dev(it->index) : NULL;
2552 if ((NULL == sdp) || (NULL == sdp->device) ||
2553 (atomic_read(&sdp->detaching)))
2554 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2555 else {
2556 scsidp = sdp->device;
2557 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n",
2558 scsidp->host->host_no, scsidp->channel,
2559 scsidp->id, scsidp->lun, (int) scsidp->type,
2560 1,
2561 (int) scsidp->queue_depth,
2562 (int) atomic_read(&scsidp->device_busy),
2563 (int) scsi_device_online(scsidp));
2564 }
2565 read_unlock_irqrestore(&sg_index_lock, iflags);
2566 return 0;
2567 }
2568
2569 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2570 {
2571 return seq_open(file, &devstrs_seq_ops);
2572 }
2573
2574 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2575 {
2576 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2577 Sg_device *sdp;
2578 struct scsi_device *scsidp;
2579 unsigned long iflags;
2580
2581 read_lock_irqsave(&sg_index_lock, iflags);
2582 sdp = it ? sg_lookup_dev(it->index) : NULL;
2583 scsidp = sdp ? sdp->device : NULL;
2584 if (sdp && scsidp && (!atomic_read(&sdp->detaching)))
2585 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2586 scsidp->vendor, scsidp->model, scsidp->rev);
2587 else
2588 seq_puts(s, "<no active device>\n");
2589 read_unlock_irqrestore(&sg_index_lock, iflags);
2590 return 0;
2591 }
2592
2593 /* must be called while holding sg_index_lock */
2594 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2595 {
2596 int k, m, new_interface, blen, usg;
2597 Sg_request *srp;
2598 Sg_fd *fp;
2599 const sg_io_hdr_t *hp;
2600 const char * cp;
2601 unsigned int ms;
2602
2603 k = 0;
2604 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2605 k++;
2606 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2607 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2608 "(res)sgat=%d low_dma=%d\n", k,
2609 jiffies_to_msecs(fp->timeout),
2610 fp->reserve.bufflen,
2611 (int) fp->reserve.k_use_sg,
2612 (int) fp->low_dma);
2613 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2614 (int) fp->cmd_q, (int) fp->force_packid,
2615 (int) fp->keep_orphan);
2616 for (m = 0, srp = fp->headrp;
2617 srp != NULL;
2618 ++m, srp = srp->nextrp) {
2619 hp = &srp->header;
2620 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2621 if (srp->res_used) {
2622 if (new_interface &&
2623 (SG_FLAG_MMAP_IO & hp->flags))
2624 cp = " mmap>> ";
2625 else
2626 cp = " rb>> ";
2627 } else {
2628 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2629 cp = " dio>> ";
2630 else
2631 cp = " ";
2632 }
2633 seq_puts(s, cp);
2634 blen = srp->data.bufflen;
2635 usg = srp->data.k_use_sg;
2636 seq_puts(s, srp->done ?
2637 ((1 == srp->done) ? "rcv:" : "fin:")
2638 : "act:");
2639 seq_printf(s, " id=%d blen=%d",
2640 srp->header.pack_id, blen);
2641 if (srp->done)
2642 seq_printf(s, " dur=%d", hp->duration);
2643 else {
2644 ms = jiffies_to_msecs(jiffies);
2645 seq_printf(s, " t_o/elap=%d/%d",
2646 (new_interface ? hp->timeout :
2647 jiffies_to_msecs(fp->timeout)),
2648 (ms > hp->duration ? ms - hp->duration : 0));
2649 }
2650 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2651 (int) srp->data.cmd_opcode);
2652 }
2653 if (0 == m)
2654 seq_puts(s, " No requests active\n");
2655 read_unlock(&fp->rq_list_lock);
2656 }
2657 }
2658
2659 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2660 {
2661 return seq_open(file, &debug_seq_ops);
2662 }
2663
2664 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2665 {
2666 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2667 Sg_device *sdp;
2668 unsigned long iflags;
2669
2670 if (it && (0 == it->index))
2671 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n",
2672 (int)it->max, sg_big_buff);
2673
2674 read_lock_irqsave(&sg_index_lock, iflags);
2675 sdp = it ? sg_lookup_dev(it->index) : NULL;
2676 if (NULL == sdp)
2677 goto skip;
2678 read_lock(&sdp->sfd_lock);
2679 if (!list_empty(&sdp->sfds)) {
2680 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2681 if (atomic_read(&sdp->detaching))
2682 seq_puts(s, "detaching pending close ");
2683 else if (sdp->device) {
2684 struct scsi_device *scsidp = sdp->device;
2685
2686 seq_printf(s, "%d:%d:%d:%llu em=%d",
2687 scsidp->host->host_no,
2688 scsidp->channel, scsidp->id,
2689 scsidp->lun,
2690 scsidp->host->hostt->emulated);
2691 }
2692 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n",
2693 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt);
2694 sg_proc_debug_helper(s, sdp);
2695 }
2696 read_unlock(&sdp->sfd_lock);
2697 skip:
2698 read_unlock_irqrestore(&sg_index_lock, iflags);
2699 return 0;
2700 }
2701
2702 #endif /* CONFIG_SCSI_PROC_FS */
2703
2704 module_init(init_sg);
2705 module_exit(exit_sg);
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