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drivers: power: report battery voltage in AOSP compatible format
[GitHub/mt8127/android_kernel_alcatel_ttab.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 - 2005 Douglas Gilbert
11 *
12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 */
20
21 static int sg_version_num = 30534; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.34"
23
24 /*
25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
28 * (otherwise the macros compile to empty statements).
29 *
30 */
31 #include <linux/module.h>
32
33 #include <linux/fs.h>
34 #include <linux/kernel.h>
35 #include <linux/sched.h>
36 #include <linux/string.h>
37 #include <linux/mm.h>
38 #include <linux/aio.h>
39 #include <linux/errno.h>
40 #include <linux/mtio.h>
41 #include <linux/ioctl.h>
42 #include <linux/slab.h>
43 #include <linux/fcntl.h>
44 #include <linux/init.h>
45 #include <linux/poll.h>
46 #include <linux/moduleparam.h>
47 #include <linux/cdev.h>
48 #include <linux/idr.h>
49 #include <linux/seq_file.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/blktrace_api.h>
53 #include <linux/mutex.h>
54 #include <linux/ratelimit.h>
55
56 #include "scsi.h"
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_ioctl.h>
61 #include <scsi/sg.h>
62
63 #include "scsi_logging.h"
64
65 #ifdef CONFIG_SCSI_PROC_FS
66 #include <linux/proc_fs.h>
67 static char *sg_version_date = "20061027";
68
69 static int sg_proc_init(void);
70 static void sg_proc_cleanup(void);
71 #endif
72
73 #define SG_ALLOW_DIO_DEF 0
74
75 #define SG_MAX_DEVS 32768
76
77 /*
78 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
79 * Then when using 32 bit integers x * m may overflow during the calculation.
80 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
81 * calculates the same, but prevents the overflow when both m and d
82 * are "small" numbers (like HZ and USER_HZ).
83 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
84 * in 32 bits.
85 */
86 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
87
88 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
89
90 int sg_big_buff = SG_DEF_RESERVED_SIZE;
91 /* N.B. This variable is readable and writeable via
92 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
93 of this size (or less if there is not enough memory) will be reserved
94 for use by this file descriptor. [Deprecated usage: this variable is also
95 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
96 the kernel (i.e. it is not a module).] */
97 static int def_reserved_size = -1; /* picks up init parameter */
98 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
99
100 static int scatter_elem_sz = SG_SCATTER_SZ;
101 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
102
103 #define SG_SECTOR_SZ 512
104
105 static int sg_add(struct device *, struct class_interface *);
106 static void sg_remove(struct device *, struct class_interface *);
107
108 static DEFINE_SPINLOCK(sg_open_exclusive_lock);
109
110 static DEFINE_IDR(sg_index_idr);
111 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
112 file descriptor list for device */
113
114 static struct class_interface sg_interface = {
115 .add_dev = sg_add,
116 .remove_dev = sg_remove,
117 };
118
119 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
120 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
121 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
122 unsigned bufflen; /* Size of (aggregate) data buffer */
123 struct page **pages;
124 int page_order;
125 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
126 unsigned char cmd_opcode; /* first byte of command */
127 } Sg_scatter_hold;
128
129 struct sg_device; /* forward declarations */
130 struct sg_fd;
131
132 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
133 struct sg_request *nextrp; /* NULL -> tail request (slist) */
134 struct sg_fd *parentfp; /* NULL -> not in use */
135 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
136 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
137 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
138 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
139 char orphan; /* 1 -> drop on sight, 0 -> normal */
140 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
141 /* done protected by rq_list_lock */
142 char done; /* 0->before bh, 1->before read, 2->read */
143 struct request *rq;
144 struct bio *bio;
145 struct execute_work ew;
146 } Sg_request;
147
148 typedef struct sg_fd { /* holds the state of a file descriptor */
149 /* sfd_siblings is protected by sg_index_lock */
150 struct list_head sfd_siblings;
151 struct sg_device *parentdp; /* owning device */
152 wait_queue_head_t read_wait; /* queue read until command done */
153 rwlock_t rq_list_lock; /* protect access to list in req_arr */
154 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
155 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
156 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
157 unsigned save_scat_len; /* original length of trunc. scat. element */
158 Sg_request *headrp; /* head of request slist, NULL->empty */
159 struct fasync_struct *async_qp; /* used by asynchronous notification */
160 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
161 char low_dma; /* as in parent but possibly overridden to 1 */
162 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
163 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
164 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
165 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
166 char mmap_called; /* 0 -> mmap() never called on this fd */
167 struct kref f_ref;
168 struct execute_work ew;
169 } Sg_fd;
170
171 typedef struct sg_device { /* holds the state of each scsi generic device */
172 struct scsi_device *device;
173 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
174 int sg_tablesize; /* adapter's max scatter-gather table size */
175 u32 index; /* device index number */
176 /* sfds is protected by sg_index_lock */
177 struct list_head sfds;
178 volatile char detached; /* 0->attached, 1->detached pending removal */
179 /* exclude protected by sg_open_exclusive_lock */
180 char exclude; /* opened for exclusive access */
181 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
182 struct gendisk *disk;
183 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
184 struct kref d_ref;
185 } Sg_device;
186
187 /* tasklet or soft irq callback */
188 static void sg_rq_end_io(struct request *rq, int uptodate);
189 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
190 static int sg_finish_rem_req(Sg_request * srp);
191 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
192 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
193 Sg_request * srp);
194 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
195 const char __user *buf, size_t count, int blocking,
196 int read_only, int sg_io_owned, Sg_request **o_srp);
197 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
198 unsigned char *cmnd, int timeout, int blocking);
199 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
200 static void sg_remove_scat(Sg_scatter_hold * schp);
201 static void sg_build_reserve(Sg_fd * sfp, int req_size);
202 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
203 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
204 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
205 static void sg_remove_sfp(struct kref *);
206 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
207 static Sg_request *sg_add_request(Sg_fd * sfp);
208 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
209 static int sg_res_in_use(Sg_fd * sfp);
210 static Sg_device *sg_get_dev(int dev);
211 static void sg_put_dev(Sg_device *sdp);
212
213 #define SZ_SG_HEADER sizeof(struct sg_header)
214 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
215 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
216 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
217
218 static int sg_allow_access(struct file *filp, unsigned char *cmd)
219 {
220 struct sg_fd *sfp = filp->private_data;
221
222 if (sfp->parentdp->device->type == TYPE_SCANNER)
223 return 0;
224
225 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE);
226 }
227
228 static int get_exclude(Sg_device *sdp)
229 {
230 unsigned long flags;
231 int ret;
232
233 spin_lock_irqsave(&sg_open_exclusive_lock, flags);
234 ret = sdp->exclude;
235 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
236 return ret;
237 }
238
239 static int set_exclude(Sg_device *sdp, char val)
240 {
241 unsigned long flags;
242
243 spin_lock_irqsave(&sg_open_exclusive_lock, flags);
244 sdp->exclude = val;
245 spin_unlock_irqrestore(&sg_open_exclusive_lock, flags);
246 return val;
247 }
248
249 static int sfds_list_empty(Sg_device *sdp)
250 {
251 unsigned long flags;
252 int ret;
253
254 read_lock_irqsave(&sg_index_lock, flags);
255 ret = list_empty(&sdp->sfds);
256 read_unlock_irqrestore(&sg_index_lock, flags);
257 return ret;
258 }
259
260 static int
261 sg_open(struct inode *inode, struct file *filp)
262 {
263 int dev = iminor(inode);
264 int flags = filp->f_flags;
265 struct request_queue *q;
266 Sg_device *sdp;
267 Sg_fd *sfp;
268 int res;
269 int retval;
270
271 nonseekable_open(inode, filp);
272 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
273 sdp = sg_get_dev(dev);
274 if (IS_ERR(sdp)) {
275 retval = PTR_ERR(sdp);
276 sdp = NULL;
277 goto sg_put;
278 }
279
280 /* This driver's module count bumped by fops_get in <linux/fs.h> */
281 /* Prevent the device driver from vanishing while we sleep */
282 retval = scsi_device_get(sdp->device);
283 if (retval)
284 goto sg_put;
285
286 retval = scsi_autopm_get_device(sdp->device);
287 if (retval)
288 goto sdp_put;
289
290 if (!((flags & O_NONBLOCK) ||
291 scsi_block_when_processing_errors(sdp->device))) {
292 retval = -ENXIO;
293 /* we are in error recovery for this device */
294 goto error_out;
295 }
296
297 if (flags & O_EXCL) {
298 if (O_RDONLY == (flags & O_ACCMODE)) {
299 retval = -EPERM; /* Can't lock it with read only access */
300 goto error_out;
301 }
302 if (!sfds_list_empty(sdp) && (flags & O_NONBLOCK)) {
303 retval = -EBUSY;
304 goto error_out;
305 }
306 res = wait_event_interruptible(sdp->o_excl_wait,
307 ((!sfds_list_empty(sdp) || get_exclude(sdp)) ? 0 : set_exclude(sdp, 1)));
308 if (res) {
309 retval = res; /* -ERESTARTSYS because signal hit process */
310 goto error_out;
311 }
312 } else if (get_exclude(sdp)) { /* some other fd has an exclusive lock on dev */
313 if (flags & O_NONBLOCK) {
314 retval = -EBUSY;
315 goto error_out;
316 }
317 res = wait_event_interruptible(sdp->o_excl_wait, !get_exclude(sdp));
318 if (res) {
319 retval = res; /* -ERESTARTSYS because signal hit process */
320 goto error_out;
321 }
322 }
323 if (sdp->detached) {
324 retval = -ENODEV;
325 goto error_out;
326 }
327 if (sfds_list_empty(sdp)) { /* no existing opens on this device */
328 sdp->sgdebug = 0;
329 q = sdp->device->request_queue;
330 sdp->sg_tablesize = queue_max_segments(q);
331 }
332 if ((sfp = sg_add_sfp(sdp, dev)))
333 filp->private_data = sfp;
334 else {
335 if (flags & O_EXCL) {
336 set_exclude(sdp, 0); /* undo if error */
337 wake_up_interruptible(&sdp->o_excl_wait);
338 }
339 retval = -ENOMEM;
340 goto error_out;
341 }
342 retval = 0;
343 error_out:
344 if (retval) {
345 scsi_autopm_put_device(sdp->device);
346 sdp_put:
347 scsi_device_put(sdp->device);
348 }
349 sg_put:
350 if (sdp)
351 sg_put_dev(sdp);
352 return retval;
353 }
354
355 /* Following function was formerly called 'sg_close' */
356 static int
357 sg_release(struct inode *inode, struct file *filp)
358 {
359 Sg_device *sdp;
360 Sg_fd *sfp;
361
362 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
363 return -ENXIO;
364 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
365
366 set_exclude(sdp, 0);
367 wake_up_interruptible(&sdp->o_excl_wait);
368
369 scsi_autopm_put_device(sdp->device);
370 kref_put(&sfp->f_ref, sg_remove_sfp);
371 return 0;
372 }
373
374 static ssize_t
375 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
376 {
377 Sg_device *sdp;
378 Sg_fd *sfp;
379 Sg_request *srp;
380 int req_pack_id = -1;
381 sg_io_hdr_t *hp;
382 struct sg_header *old_hdr = NULL;
383 int retval = 0;
384
385 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
386 return -ENXIO;
387 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
388 sdp->disk->disk_name, (int) count));
389
390 if (!access_ok(VERIFY_WRITE, buf, count))
391 return -EFAULT;
392 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
393 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
394 if (!old_hdr)
395 return -ENOMEM;
396 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
397 retval = -EFAULT;
398 goto free_old_hdr;
399 }
400 if (old_hdr->reply_len < 0) {
401 if (count >= SZ_SG_IO_HDR) {
402 sg_io_hdr_t *new_hdr;
403 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
404 if (!new_hdr) {
405 retval = -ENOMEM;
406 goto free_old_hdr;
407 }
408 retval =__copy_from_user
409 (new_hdr, buf, SZ_SG_IO_HDR);
410 req_pack_id = new_hdr->pack_id;
411 kfree(new_hdr);
412 if (retval) {
413 retval = -EFAULT;
414 goto free_old_hdr;
415 }
416 }
417 } else
418 req_pack_id = old_hdr->pack_id;
419 }
420 srp = sg_get_rq_mark(sfp, req_pack_id);
421 if (!srp) { /* now wait on packet to arrive */
422 if (sdp->detached) {
423 retval = -ENODEV;
424 goto free_old_hdr;
425 }
426 if (filp->f_flags & O_NONBLOCK) {
427 retval = -EAGAIN;
428 goto free_old_hdr;
429 }
430 retval = wait_event_interruptible(sfp->read_wait,
431 (sdp->detached ||
432 (srp = sg_get_rq_mark(sfp, req_pack_id))));
433 if (sdp->detached) {
434 retval = -ENODEV;
435 goto free_old_hdr;
436 }
437 if (retval) {
438 /* -ERESTARTSYS as signal hit process */
439 goto free_old_hdr;
440 }
441 }
442 if (srp->header.interface_id != '\0') {
443 retval = sg_new_read(sfp, buf, count, srp);
444 goto free_old_hdr;
445 }
446
447 hp = &srp->header;
448 if (old_hdr == NULL) {
449 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
450 if (! old_hdr) {
451 retval = -ENOMEM;
452 goto free_old_hdr;
453 }
454 }
455 memset(old_hdr, 0, SZ_SG_HEADER);
456 old_hdr->reply_len = (int) hp->timeout;
457 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
458 old_hdr->pack_id = hp->pack_id;
459 old_hdr->twelve_byte =
460 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
461 old_hdr->target_status = hp->masked_status;
462 old_hdr->host_status = hp->host_status;
463 old_hdr->driver_status = hp->driver_status;
464 if ((CHECK_CONDITION & hp->masked_status) ||
465 (DRIVER_SENSE & hp->driver_status))
466 memcpy(old_hdr->sense_buffer, srp->sense_b,
467 sizeof (old_hdr->sense_buffer));
468 switch (hp->host_status) {
469 /* This setup of 'result' is for backward compatibility and is best
470 ignored by the user who should use target, host + driver status */
471 case DID_OK:
472 case DID_PASSTHROUGH:
473 case DID_SOFT_ERROR:
474 old_hdr->result = 0;
475 break;
476 case DID_NO_CONNECT:
477 case DID_BUS_BUSY:
478 case DID_TIME_OUT:
479 old_hdr->result = EBUSY;
480 break;
481 case DID_BAD_TARGET:
482 case DID_ABORT:
483 case DID_PARITY:
484 case DID_RESET:
485 case DID_BAD_INTR:
486 old_hdr->result = EIO;
487 break;
488 case DID_ERROR:
489 old_hdr->result = (srp->sense_b[0] == 0 &&
490 hp->masked_status == GOOD) ? 0 : EIO;
491 break;
492 default:
493 old_hdr->result = EIO;
494 break;
495 }
496
497 /* Now copy the result back to the user buffer. */
498 if (count >= SZ_SG_HEADER) {
499 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
500 retval = -EFAULT;
501 goto free_old_hdr;
502 }
503 buf += SZ_SG_HEADER;
504 if (count > old_hdr->reply_len)
505 count = old_hdr->reply_len;
506 if (count > SZ_SG_HEADER) {
507 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
508 retval = -EFAULT;
509 goto free_old_hdr;
510 }
511 }
512 } else
513 count = (old_hdr->result == 0) ? 0 : -EIO;
514 sg_finish_rem_req(srp);
515 retval = count;
516 free_old_hdr:
517 kfree(old_hdr);
518 return retval;
519 }
520
521 static ssize_t
522 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
523 {
524 sg_io_hdr_t *hp = &srp->header;
525 int err = 0, err2;
526 int len;
527
528 if (count < SZ_SG_IO_HDR) {
529 err = -EINVAL;
530 goto err_out;
531 }
532 hp->sb_len_wr = 0;
533 if ((hp->mx_sb_len > 0) && hp->sbp) {
534 if ((CHECK_CONDITION & hp->masked_status) ||
535 (DRIVER_SENSE & hp->driver_status)) {
536 int sb_len = SCSI_SENSE_BUFFERSIZE;
537 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
538 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
539 len = (len > sb_len) ? sb_len : len;
540 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
541 err = -EFAULT;
542 goto err_out;
543 }
544 hp->sb_len_wr = len;
545 }
546 }
547 if (hp->masked_status || hp->host_status || hp->driver_status)
548 hp->info |= SG_INFO_CHECK;
549 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
550 err = -EFAULT;
551 goto err_out;
552 }
553 err_out:
554 err2 = sg_finish_rem_req(srp);
555 return err ? : err2 ? : count;
556 }
557
558 static ssize_t
559 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
560 {
561 int mxsize, cmd_size, k;
562 int input_size, blocking;
563 unsigned char opcode;
564 Sg_device *sdp;
565 Sg_fd *sfp;
566 Sg_request *srp;
567 struct sg_header old_hdr;
568 sg_io_hdr_t *hp;
569 unsigned char cmnd[MAX_COMMAND_SIZE];
570
571 if (unlikely(segment_eq(get_fs(), KERNEL_DS)))
572 return -EINVAL;
573
574 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
575 return -ENXIO;
576 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
577 sdp->disk->disk_name, (int) count));
578 if (sdp->detached)
579 return -ENODEV;
580 if (!((filp->f_flags & O_NONBLOCK) ||
581 scsi_block_when_processing_errors(sdp->device)))
582 return -ENXIO;
583
584 if (!access_ok(VERIFY_READ, buf, count))
585 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
586 if (count < SZ_SG_HEADER)
587 return -EIO;
588 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
589 return -EFAULT;
590 blocking = !(filp->f_flags & O_NONBLOCK);
591 if (old_hdr.reply_len < 0)
592 return sg_new_write(sfp, filp, buf, count,
593 blocking, 0, 0, NULL);
594 if (count < (SZ_SG_HEADER + 6))
595 return -EIO; /* The minimum scsi command length is 6 bytes. */
596
597 if (!(srp = sg_add_request(sfp))) {
598 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
599 return -EDOM;
600 }
601 buf += SZ_SG_HEADER;
602 __get_user(opcode, buf);
603 if (sfp->next_cmd_len > 0) {
604 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
605 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
606 sfp->next_cmd_len = 0;
607 sg_remove_request(sfp, srp);
608 return -EIO;
609 }
610 cmd_size = sfp->next_cmd_len;
611 sfp->next_cmd_len = 0; /* reset so only this write() effected */
612 } else {
613 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
614 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
615 cmd_size = 12;
616 }
617 SCSI_LOG_TIMEOUT(4, printk(
618 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
619 /* Determine buffer size. */
620 input_size = count - cmd_size;
621 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
622 mxsize -= SZ_SG_HEADER;
623 input_size -= SZ_SG_HEADER;
624 if (input_size < 0) {
625 sg_remove_request(sfp, srp);
626 return -EIO; /* User did not pass enough bytes for this command. */
627 }
628 hp = &srp->header;
629 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
630 hp->cmd_len = (unsigned char) cmd_size;
631 hp->iovec_count = 0;
632 hp->mx_sb_len = 0;
633 if (input_size > 0)
634 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
635 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
636 else
637 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
638 hp->dxfer_len = mxsize;
639 if ((hp->dxfer_direction == SG_DXFER_TO_DEV) ||
640 (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV))
641 hp->dxferp = (char __user *)buf + cmd_size;
642 else
643 hp->dxferp = NULL;
644 hp->sbp = NULL;
645 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
646 hp->flags = input_size; /* structure abuse ... */
647 hp->pack_id = old_hdr.pack_id;
648 hp->usr_ptr = NULL;
649 if (__copy_from_user(cmnd, buf, cmd_size))
650 return -EFAULT;
651 /*
652 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
653 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
654 * is a non-zero input_size, so emit a warning.
655 */
656 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
657 static char cmd[TASK_COMM_LEN];
658 if (strcmp(current->comm, cmd)) {
659 printk_ratelimited(KERN_WARNING
660 "sg_write: data in/out %d/%d bytes "
661 "for SCSI command 0x%x-- guessing "
662 "data in;\n program %s not setting "
663 "count and/or reply_len properly\n",
664 old_hdr.reply_len - (int)SZ_SG_HEADER,
665 input_size, (unsigned int) cmnd[0],
666 current->comm);
667 strcpy(cmd, current->comm);
668 }
669 }
670 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
671 return (k < 0) ? k : count;
672 }
673
674 static ssize_t
675 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
676 size_t count, int blocking, int read_only, int sg_io_owned,
677 Sg_request **o_srp)
678 {
679 int k;
680 Sg_request *srp;
681 sg_io_hdr_t *hp;
682 unsigned char cmnd[MAX_COMMAND_SIZE];
683 int timeout;
684 unsigned long ul_timeout;
685
686 if (count < SZ_SG_IO_HDR)
687 return -EINVAL;
688 if (!access_ok(VERIFY_READ, buf, count))
689 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
690
691 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
692 if (!(srp = sg_add_request(sfp))) {
693 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
694 return -EDOM;
695 }
696 srp->sg_io_owned = sg_io_owned;
697 hp = &srp->header;
698 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
699 sg_remove_request(sfp, srp);
700 return -EFAULT;
701 }
702 if (hp->interface_id != 'S') {
703 sg_remove_request(sfp, srp);
704 return -ENOSYS;
705 }
706 if (hp->flags & SG_FLAG_MMAP_IO) {
707 if (hp->dxfer_len > sfp->reserve.bufflen) {
708 sg_remove_request(sfp, srp);
709 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
710 }
711 if (hp->flags & SG_FLAG_DIRECT_IO) {
712 sg_remove_request(sfp, srp);
713 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
714 }
715 if (sg_res_in_use(sfp)) {
716 sg_remove_request(sfp, srp);
717 return -EBUSY; /* reserve buffer already being used */
718 }
719 }
720 ul_timeout = msecs_to_jiffies(srp->header.timeout);
721 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
722 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
723 sg_remove_request(sfp, srp);
724 return -EMSGSIZE;
725 }
726 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
727 sg_remove_request(sfp, srp);
728 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
729 }
730 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
731 sg_remove_request(sfp, srp);
732 return -EFAULT;
733 }
734 if (read_only && sg_allow_access(file, cmnd)) {
735 sg_remove_request(sfp, srp);
736 return -EPERM;
737 }
738 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
739 if (k < 0)
740 return k;
741 if (o_srp)
742 *o_srp = srp;
743 return count;
744 }
745
746 static int
747 sg_common_write(Sg_fd * sfp, Sg_request * srp,
748 unsigned char *cmnd, int timeout, int blocking)
749 {
750 int k, data_dir;
751 Sg_device *sdp = sfp->parentdp;
752 sg_io_hdr_t *hp = &srp->header;
753
754 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
755 hp->status = 0;
756 hp->masked_status = 0;
757 hp->msg_status = 0;
758 hp->info = 0;
759 hp->host_status = 0;
760 hp->driver_status = 0;
761 hp->resid = 0;
762 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
763 (int) cmnd[0], (int) hp->cmd_len));
764
765 k = sg_start_req(srp, cmnd);
766 if (k) {
767 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
768 sg_finish_rem_req(srp);
769 return k; /* probably out of space --> ENOMEM */
770 }
771 if (sdp->detached) {
772 if (srp->bio) {
773 if (srp->rq->cmd != srp->rq->__cmd)
774 kfree(srp->rq->cmd);
775
776 blk_end_request_all(srp->rq, -EIO);
777 srp->rq = NULL;
778 }
779
780 sg_finish_rem_req(srp);
781 return -ENODEV;
782 }
783
784 switch (hp->dxfer_direction) {
785 case SG_DXFER_TO_FROM_DEV:
786 case SG_DXFER_FROM_DEV:
787 data_dir = DMA_FROM_DEVICE;
788 break;
789 case SG_DXFER_TO_DEV:
790 data_dir = DMA_TO_DEVICE;
791 break;
792 case SG_DXFER_UNKNOWN:
793 data_dir = DMA_BIDIRECTIONAL;
794 break;
795 default:
796 data_dir = DMA_NONE;
797 break;
798 }
799 hp->duration = jiffies_to_msecs(jiffies);
800
801 srp->rq->timeout = timeout;
802 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */
803 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
804 srp->rq, 1, sg_rq_end_io);
805 return 0;
806 }
807
808 static int srp_done(Sg_fd *sfp, Sg_request *srp)
809 {
810 unsigned long flags;
811 int ret;
812
813 read_lock_irqsave(&sfp->rq_list_lock, flags);
814 ret = srp->done;
815 read_unlock_irqrestore(&sfp->rq_list_lock, flags);
816 return ret;
817 }
818
819 static long
820 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
821 {
822 void __user *p = (void __user *)arg;
823 int __user *ip = p;
824 int result, val, read_only;
825 Sg_device *sdp;
826 Sg_fd *sfp;
827 Sg_request *srp;
828 unsigned long iflags;
829
830 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
831 return -ENXIO;
832
833 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
834 sdp->disk->disk_name, (int) cmd_in));
835 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
836
837 switch (cmd_in) {
838 case SG_IO:
839 if (sdp->detached)
840 return -ENODEV;
841 if (!scsi_block_when_processing_errors(sdp->device))
842 return -ENXIO;
843 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
844 return -EFAULT;
845 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
846 1, read_only, 1, &srp);
847 if (result < 0)
848 return result;
849 result = wait_event_interruptible(sfp->read_wait,
850 (srp_done(sfp, srp) || sdp->detached));
851 if (sdp->detached)
852 return -ENODEV;
853 write_lock_irq(&sfp->rq_list_lock);
854 if (srp->done) {
855 srp->done = 2;
856 write_unlock_irq(&sfp->rq_list_lock);
857 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
858 return (result < 0) ? result : 0;
859 }
860 srp->orphan = 1;
861 write_unlock_irq(&sfp->rq_list_lock);
862 return result; /* -ERESTARTSYS because signal hit process */
863 case SG_SET_TIMEOUT:
864 result = get_user(val, ip);
865 if (result)
866 return result;
867 if (val < 0)
868 return -EIO;
869 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
870 val = MULDIV (INT_MAX, USER_HZ, HZ);
871 sfp->timeout_user = val;
872 sfp->timeout = MULDIV (val, HZ, USER_HZ);
873
874 return 0;
875 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
876 /* strange ..., for backward compatibility */
877 return sfp->timeout_user;
878 case SG_SET_FORCE_LOW_DMA:
879 result = get_user(val, ip);
880 if (result)
881 return result;
882 if (val) {
883 sfp->low_dma = 1;
884 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
885 val = (int) sfp->reserve.bufflen;
886 sg_remove_scat(&sfp->reserve);
887 sg_build_reserve(sfp, val);
888 }
889 } else {
890 if (sdp->detached)
891 return -ENODEV;
892 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
893 }
894 return 0;
895 case SG_GET_LOW_DMA:
896 return put_user((int) sfp->low_dma, ip);
897 case SG_GET_SCSI_ID:
898 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
899 return -EFAULT;
900 else {
901 sg_scsi_id_t __user *sg_idp = p;
902
903 if (sdp->detached)
904 return -ENODEV;
905 __put_user((int) sdp->device->host->host_no,
906 &sg_idp->host_no);
907 __put_user((int) sdp->device->channel,
908 &sg_idp->channel);
909 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
910 __put_user((int) sdp->device->lun, &sg_idp->lun);
911 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
912 __put_user((short) sdp->device->host->cmd_per_lun,
913 &sg_idp->h_cmd_per_lun);
914 __put_user((short) sdp->device->queue_depth,
915 &sg_idp->d_queue_depth);
916 __put_user(0, &sg_idp->unused[0]);
917 __put_user(0, &sg_idp->unused[1]);
918 return 0;
919 }
920 case SG_SET_FORCE_PACK_ID:
921 result = get_user(val, ip);
922 if (result)
923 return result;
924 sfp->force_packid = val ? 1 : 0;
925 return 0;
926 case SG_GET_PACK_ID:
927 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
928 return -EFAULT;
929 read_lock_irqsave(&sfp->rq_list_lock, iflags);
930 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
931 if ((1 == srp->done) && (!srp->sg_io_owned)) {
932 read_unlock_irqrestore(&sfp->rq_list_lock,
933 iflags);
934 __put_user(srp->header.pack_id, ip);
935 return 0;
936 }
937 }
938 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
939 __put_user(-1, ip);
940 return 0;
941 case SG_GET_NUM_WAITING:
942 read_lock_irqsave(&sfp->rq_list_lock, iflags);
943 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
944 if ((1 == srp->done) && (!srp->sg_io_owned))
945 ++val;
946 }
947 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
948 return put_user(val, ip);
949 case SG_GET_SG_TABLESIZE:
950 return put_user(sdp->sg_tablesize, ip);
951 case SG_SET_RESERVED_SIZE:
952 result = get_user(val, ip);
953 if (result)
954 return result;
955 if (val < 0)
956 return -EINVAL;
957 val = min_t(int, val,
958 queue_max_sectors(sdp->device->request_queue) * 512);
959 if (val != sfp->reserve.bufflen) {
960 if (sg_res_in_use(sfp) || sfp->mmap_called)
961 return -EBUSY;
962 sg_remove_scat(&sfp->reserve);
963 sg_build_reserve(sfp, val);
964 }
965 return 0;
966 case SG_GET_RESERVED_SIZE:
967 val = min_t(int, sfp->reserve.bufflen,
968 queue_max_sectors(sdp->device->request_queue) * 512);
969 return put_user(val, ip);
970 case SG_SET_COMMAND_Q:
971 result = get_user(val, ip);
972 if (result)
973 return result;
974 sfp->cmd_q = val ? 1 : 0;
975 return 0;
976 case SG_GET_COMMAND_Q:
977 return put_user((int) sfp->cmd_q, ip);
978 case SG_SET_KEEP_ORPHAN:
979 result = get_user(val, ip);
980 if (result)
981 return result;
982 sfp->keep_orphan = val;
983 return 0;
984 case SG_GET_KEEP_ORPHAN:
985 return put_user((int) sfp->keep_orphan, ip);
986 case SG_NEXT_CMD_LEN:
987 result = get_user(val, ip);
988 if (result)
989 return result;
990 sfp->next_cmd_len = (val > 0) ? val : 0;
991 return 0;
992 case SG_GET_VERSION_NUM:
993 return put_user(sg_version_num, ip);
994 case SG_GET_ACCESS_COUNT:
995 /* faked - we don't have a real access count anymore */
996 val = (sdp->device ? 1 : 0);
997 return put_user(val, ip);
998 case SG_GET_REQUEST_TABLE:
999 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1000 return -EFAULT;
1001 else {
1002 sg_req_info_t *rinfo;
1003 unsigned int ms;
1004
1005 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1006 GFP_KERNEL);
1007 if (!rinfo)
1008 return -ENOMEM;
1009 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1010 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1011 ++val, srp = srp ? srp->nextrp : srp) {
1012 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1013 if (srp) {
1014 rinfo[val].req_state = srp->done + 1;
1015 rinfo[val].problem =
1016 srp->header.masked_status &
1017 srp->header.host_status &
1018 srp->header.driver_status;
1019 if (srp->done)
1020 rinfo[val].duration =
1021 srp->header.duration;
1022 else {
1023 ms = jiffies_to_msecs(jiffies);
1024 rinfo[val].duration =
1025 (ms > srp->header.duration) ?
1026 (ms - srp->header.duration) : 0;
1027 }
1028 rinfo[val].orphan = srp->orphan;
1029 rinfo[val].sg_io_owned =
1030 srp->sg_io_owned;
1031 rinfo[val].pack_id =
1032 srp->header.pack_id;
1033 rinfo[val].usr_ptr =
1034 srp->header.usr_ptr;
1035 }
1036 }
1037 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1038 result = __copy_to_user(p, rinfo,
1039 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1040 result = result ? -EFAULT : 0;
1041 kfree(rinfo);
1042 return result;
1043 }
1044 case SG_EMULATED_HOST:
1045 if (sdp->detached)
1046 return -ENODEV;
1047 return put_user(sdp->device->host->hostt->emulated, ip);
1048 case SG_SCSI_RESET:
1049 if (sdp->detached)
1050 return -ENODEV;
1051 if (filp->f_flags & O_NONBLOCK) {
1052 if (scsi_host_in_recovery(sdp->device->host))
1053 return -EBUSY;
1054 } else if (!scsi_block_when_processing_errors(sdp->device))
1055 return -EBUSY;
1056 result = get_user(val, ip);
1057 if (result)
1058 return result;
1059 if (SG_SCSI_RESET_NOTHING == val)
1060 return 0;
1061 switch (val) {
1062 case SG_SCSI_RESET_DEVICE:
1063 val = SCSI_TRY_RESET_DEVICE;
1064 break;
1065 case SG_SCSI_RESET_TARGET:
1066 val = SCSI_TRY_RESET_TARGET;
1067 break;
1068 case SG_SCSI_RESET_BUS:
1069 val = SCSI_TRY_RESET_BUS;
1070 break;
1071 case SG_SCSI_RESET_HOST:
1072 val = SCSI_TRY_RESET_HOST;
1073 break;
1074 default:
1075 return -EINVAL;
1076 }
1077 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1078 return -EACCES;
1079 return (scsi_reset_provider(sdp->device, val) ==
1080 SUCCESS) ? 0 : -EIO;
1081 case SCSI_IOCTL_SEND_COMMAND:
1082 if (sdp->detached)
1083 return -ENODEV;
1084 if (read_only) {
1085 unsigned char opcode = WRITE_6;
1086 Scsi_Ioctl_Command __user *siocp = p;
1087
1088 if (copy_from_user(&opcode, siocp->data, 1))
1089 return -EFAULT;
1090 if (sg_allow_access(filp, &opcode))
1091 return -EPERM;
1092 }
1093 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p);
1094 case SG_SET_DEBUG:
1095 result = get_user(val, ip);
1096 if (result)
1097 return result;
1098 sdp->sgdebug = (char) val;
1099 return 0;
1100 case SCSI_IOCTL_GET_IDLUN:
1101 case SCSI_IOCTL_GET_BUS_NUMBER:
1102 case SCSI_IOCTL_PROBE_HOST:
1103 case SG_GET_TRANSFORM:
1104 if (sdp->detached)
1105 return -ENODEV;
1106 return scsi_ioctl(sdp->device, cmd_in, p);
1107 case BLKSECTGET:
1108 return put_user(queue_max_sectors(sdp->device->request_queue) * 512,
1109 ip);
1110 case BLKTRACESETUP:
1111 return blk_trace_setup(sdp->device->request_queue,
1112 sdp->disk->disk_name,
1113 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1114 NULL,
1115 (char *)arg);
1116 case BLKTRACESTART:
1117 return blk_trace_startstop(sdp->device->request_queue, 1);
1118 case BLKTRACESTOP:
1119 return blk_trace_startstop(sdp->device->request_queue, 0);
1120 case BLKTRACETEARDOWN:
1121 return blk_trace_remove(sdp->device->request_queue);
1122 default:
1123 if (read_only)
1124 return -EPERM; /* don't know so take safe approach */
1125 return scsi_ioctl(sdp->device, cmd_in, p);
1126 }
1127 }
1128
1129 #ifdef CONFIG_COMPAT
1130 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1131 {
1132 Sg_device *sdp;
1133 Sg_fd *sfp;
1134 struct scsi_device *sdev;
1135
1136 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1137 return -ENXIO;
1138
1139 sdev = sdp->device;
1140 if (sdev->host->hostt->compat_ioctl) {
1141 int ret;
1142
1143 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1144
1145 return ret;
1146 }
1147
1148 return -ENOIOCTLCMD;
1149 }
1150 #endif
1151
1152 static unsigned int
1153 sg_poll(struct file *filp, poll_table * wait)
1154 {
1155 unsigned int res = 0;
1156 Sg_device *sdp;
1157 Sg_fd *sfp;
1158 Sg_request *srp;
1159 int count = 0;
1160 unsigned long iflags;
1161
1162 sfp = filp->private_data;
1163 if (!sfp)
1164 return POLLERR;
1165 sdp = sfp->parentdp;
1166 if (!sdp)
1167 return POLLERR;
1168 poll_wait(filp, &sfp->read_wait, wait);
1169 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1170 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1171 /* if any read waiting, flag it */
1172 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1173 res = POLLIN | POLLRDNORM;
1174 ++count;
1175 }
1176 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1177
1178 if (sdp->detached)
1179 res |= POLLHUP;
1180 else if (!sfp->cmd_q) {
1181 if (0 == count)
1182 res |= POLLOUT | POLLWRNORM;
1183 } else if (count < SG_MAX_QUEUE)
1184 res |= POLLOUT | POLLWRNORM;
1185 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1186 sdp->disk->disk_name, (int) res));
1187 return res;
1188 }
1189
1190 static int
1191 sg_fasync(int fd, struct file *filp, int mode)
1192 {
1193 Sg_device *sdp;
1194 Sg_fd *sfp;
1195
1196 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1197 return -ENXIO;
1198 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1199 sdp->disk->disk_name, mode));
1200
1201 return fasync_helper(fd, filp, mode, &sfp->async_qp);
1202 }
1203
1204 static int
1205 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1206 {
1207 Sg_fd *sfp;
1208 unsigned long offset, len, sa;
1209 Sg_scatter_hold *rsv_schp;
1210 int k, length;
1211
1212 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1213 return VM_FAULT_SIGBUS;
1214 rsv_schp = &sfp->reserve;
1215 offset = vmf->pgoff << PAGE_SHIFT;
1216 if (offset >= rsv_schp->bufflen)
1217 return VM_FAULT_SIGBUS;
1218 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1219 offset, rsv_schp->k_use_sg));
1220 sa = vma->vm_start;
1221 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1222 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1223 len = vma->vm_end - sa;
1224 len = (len < length) ? len : length;
1225 if (offset < len) {
1226 struct page *page = nth_page(rsv_schp->pages[k],
1227 offset >> PAGE_SHIFT);
1228 get_page(page); /* increment page count */
1229 vmf->page = page;
1230 return 0; /* success */
1231 }
1232 sa += len;
1233 offset -= len;
1234 }
1235
1236 return VM_FAULT_SIGBUS;
1237 }
1238
1239 static const struct vm_operations_struct sg_mmap_vm_ops = {
1240 .fault = sg_vma_fault,
1241 };
1242
1243 static int
1244 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1245 {
1246 Sg_fd *sfp;
1247 unsigned long req_sz, len, sa;
1248 Sg_scatter_hold *rsv_schp;
1249 int k, length;
1250
1251 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1252 return -ENXIO;
1253 req_sz = vma->vm_end - vma->vm_start;
1254 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1255 (void *) vma->vm_start, (int) req_sz));
1256 if (vma->vm_pgoff)
1257 return -EINVAL; /* want no offset */
1258 rsv_schp = &sfp->reserve;
1259 if (req_sz > rsv_schp->bufflen)
1260 return -ENOMEM; /* cannot map more than reserved buffer */
1261
1262 sa = vma->vm_start;
1263 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1264 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1265 len = vma->vm_end - sa;
1266 len = (len < length) ? len : length;
1267 sa += len;
1268 }
1269
1270 sfp->mmap_called = 1;
1271 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1272 vma->vm_private_data = sfp;
1273 vma->vm_ops = &sg_mmap_vm_ops;
1274 return 0;
1275 }
1276
1277 static void sg_rq_end_io_usercontext(struct work_struct *work)
1278 {
1279 struct sg_request *srp = container_of(work, struct sg_request, ew.work);
1280 struct sg_fd *sfp = srp->parentfp;
1281
1282 sg_finish_rem_req(srp);
1283 kref_put(&sfp->f_ref, sg_remove_sfp);
1284 }
1285
1286 /*
1287 * This function is a "bottom half" handler that is called by the mid
1288 * level when a command is completed (or has failed).
1289 */
1290 static void sg_rq_end_io(struct request *rq, int uptodate)
1291 {
1292 struct sg_request *srp = rq->end_io_data;
1293 Sg_device *sdp;
1294 Sg_fd *sfp;
1295 unsigned long iflags;
1296 unsigned int ms;
1297 char *sense;
1298 int result, resid, done = 1;
1299
1300 if (WARN_ON(srp->done != 0))
1301 return;
1302
1303 sfp = srp->parentfp;
1304 if (WARN_ON(sfp == NULL))
1305 return;
1306
1307 sdp = sfp->parentdp;
1308 if (unlikely(sdp->detached))
1309 printk(KERN_INFO "sg_rq_end_io: device detached\n");
1310
1311 sense = rq->sense;
1312 result = rq->errors;
1313 resid = rq->resid_len;
1314
1315 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1316 sdp->disk->disk_name, srp->header.pack_id, result));
1317 srp->header.resid = resid;
1318 ms = jiffies_to_msecs(jiffies);
1319 srp->header.duration = (ms > srp->header.duration) ?
1320 (ms - srp->header.duration) : 0;
1321 if (0 != result) {
1322 struct scsi_sense_hdr sshdr;
1323
1324 srp->header.status = 0xff & result;
1325 srp->header.masked_status = status_byte(result);
1326 srp->header.msg_status = msg_byte(result);
1327 srp->header.host_status = host_byte(result);
1328 srp->header.driver_status = driver_byte(result);
1329 if ((sdp->sgdebug > 0) &&
1330 ((CHECK_CONDITION == srp->header.masked_status) ||
1331 (COMMAND_TERMINATED == srp->header.masked_status)))
1332 __scsi_print_sense("sg_cmd_done", sense,
1333 SCSI_SENSE_BUFFERSIZE);
1334
1335 /* Following if statement is a patch supplied by Eric Youngdale */
1336 if (driver_byte(result) != 0
1337 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1338 && !scsi_sense_is_deferred(&sshdr)
1339 && sshdr.sense_key == UNIT_ATTENTION
1340 && sdp->device->removable) {
1341 /* Detected possible disc change. Set the bit - this */
1342 /* may be used if there are filesystems using this device */
1343 sdp->device->changed = 1;
1344 }
1345 }
1346 /* Rely on write phase to clean out srp status values, so no "else" */
1347
1348 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1349 if (unlikely(srp->orphan)) {
1350 if (sfp->keep_orphan)
1351 srp->sg_io_owned = 0;
1352 else
1353 done = 0;
1354 }
1355 srp->done = done;
1356 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1357
1358 if (likely(done)) {
1359 /* Now wake up any sg_read() that is waiting for this
1360 * packet.
1361 */
1362 wake_up_interruptible(&sfp->read_wait);
1363 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1364 kref_put(&sfp->f_ref, sg_remove_sfp);
1365 } else {
1366 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext);
1367 schedule_work(&srp->ew.work);
1368 }
1369 }
1370
1371 static const struct file_operations sg_fops = {
1372 .owner = THIS_MODULE,
1373 .read = sg_read,
1374 .write = sg_write,
1375 .poll = sg_poll,
1376 .unlocked_ioctl = sg_ioctl,
1377 #ifdef CONFIG_COMPAT
1378 .compat_ioctl = sg_compat_ioctl,
1379 #endif
1380 .open = sg_open,
1381 .mmap = sg_mmap,
1382 .release = sg_release,
1383 .fasync = sg_fasync,
1384 .llseek = no_llseek,
1385 };
1386
1387 static struct class *sg_sysfs_class;
1388
1389 static int sg_sysfs_valid = 0;
1390
1391 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1392 {
1393 struct request_queue *q = scsidp->request_queue;
1394 Sg_device *sdp;
1395 unsigned long iflags;
1396 int error;
1397 u32 k;
1398
1399 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1400 if (!sdp) {
1401 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1402 return ERR_PTR(-ENOMEM);
1403 }
1404
1405 idr_preload(GFP_KERNEL);
1406 write_lock_irqsave(&sg_index_lock, iflags);
1407
1408 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
1409 if (error < 0) {
1410 if (error == -ENOSPC) {
1411 sdev_printk(KERN_WARNING, scsidp,
1412 "Unable to attach sg device type=%d, minor number exceeds %d\n",
1413 scsidp->type, SG_MAX_DEVS - 1);
1414 error = -ENODEV;
1415 } else {
1416 printk(KERN_WARNING
1417 "idr allocation Sg_device failure: %d\n", error);
1418 }
1419 goto out_unlock;
1420 }
1421 k = error;
1422
1423 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1424 sprintf(disk->disk_name, "sg%d", k);
1425 disk->first_minor = k;
1426 sdp->disk = disk;
1427 sdp->device = scsidp;
1428 INIT_LIST_HEAD(&sdp->sfds);
1429 init_waitqueue_head(&sdp->o_excl_wait);
1430 sdp->sg_tablesize = queue_max_segments(q);
1431 sdp->index = k;
1432 kref_init(&sdp->d_ref);
1433 error = 0;
1434
1435 out_unlock:
1436 write_unlock_irqrestore(&sg_index_lock, iflags);
1437 idr_preload_end();
1438
1439 if (error) {
1440 kfree(sdp);
1441 return ERR_PTR(error);
1442 }
1443 return sdp;
1444 }
1445
1446 static int
1447 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1448 {
1449 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1450 struct gendisk *disk;
1451 Sg_device *sdp = NULL;
1452 struct cdev * cdev = NULL;
1453 int error;
1454 unsigned long iflags;
1455
1456 disk = alloc_disk(1);
1457 if (!disk) {
1458 printk(KERN_WARNING "alloc_disk failed\n");
1459 return -ENOMEM;
1460 }
1461 disk->major = SCSI_GENERIC_MAJOR;
1462
1463 error = -ENOMEM;
1464 cdev = cdev_alloc();
1465 if (!cdev) {
1466 printk(KERN_WARNING "cdev_alloc failed\n");
1467 goto out;
1468 }
1469 cdev->owner = THIS_MODULE;
1470 cdev->ops = &sg_fops;
1471
1472 sdp = sg_alloc(disk, scsidp);
1473 if (IS_ERR(sdp)) {
1474 printk(KERN_WARNING "sg_alloc failed\n");
1475 error = PTR_ERR(sdp);
1476 goto out;
1477 }
1478
1479 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1480 if (error)
1481 goto cdev_add_err;
1482
1483 sdp->cdev = cdev;
1484 if (sg_sysfs_valid) {
1485 struct device *sg_class_member;
1486
1487 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
1488 MKDEV(SCSI_GENERIC_MAJOR,
1489 sdp->index),
1490 sdp, "%s", disk->disk_name);
1491 if (IS_ERR(sg_class_member)) {
1492 printk(KERN_ERR "sg_add: "
1493 "device_create failed\n");
1494 error = PTR_ERR(sg_class_member);
1495 goto cdev_add_err;
1496 }
1497 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1498 &sg_class_member->kobj, "generic");
1499 if (error)
1500 printk(KERN_ERR "sg_add: unable to make symlink "
1501 "'generic' back to sg%d\n", sdp->index);
1502 } else
1503 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1504
1505 sdev_printk(KERN_NOTICE, scsidp,
1506 "Attached scsi generic sg%d type %d\n", sdp->index,
1507 scsidp->type);
1508
1509 dev_set_drvdata(cl_dev, sdp);
1510
1511 return 0;
1512
1513 cdev_add_err:
1514 write_lock_irqsave(&sg_index_lock, iflags);
1515 idr_remove(&sg_index_idr, sdp->index);
1516 write_unlock_irqrestore(&sg_index_lock, iflags);
1517 kfree(sdp);
1518
1519 out:
1520 put_disk(disk);
1521 if (cdev)
1522 cdev_del(cdev);
1523 return error;
1524 }
1525
1526 static void sg_device_destroy(struct kref *kref)
1527 {
1528 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref);
1529 unsigned long flags;
1530
1531 /* CAUTION! Note that the device can still be found via idr_find()
1532 * even though the refcount is 0. Therefore, do idr_remove() BEFORE
1533 * any other cleanup.
1534 */
1535
1536 write_lock_irqsave(&sg_index_lock, flags);
1537 idr_remove(&sg_index_idr, sdp->index);
1538 write_unlock_irqrestore(&sg_index_lock, flags);
1539
1540 SCSI_LOG_TIMEOUT(3,
1541 printk("sg_device_destroy: %s\n",
1542 sdp->disk->disk_name));
1543
1544 put_disk(sdp->disk);
1545 kfree(sdp);
1546 }
1547
1548 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1549 {
1550 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1551 Sg_device *sdp = dev_get_drvdata(cl_dev);
1552 unsigned long iflags;
1553 Sg_fd *sfp;
1554
1555 if (!sdp || sdp->detached)
1556 return;
1557
1558 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name));
1559
1560 /* Need a write lock to set sdp->detached. */
1561 write_lock_irqsave(&sg_index_lock, iflags);
1562 sdp->detached = 1;
1563 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
1564 wake_up_interruptible(&sfp->read_wait);
1565 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP);
1566 }
1567 write_unlock_irqrestore(&sg_index_lock, iflags);
1568
1569 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1570 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1571 cdev_del(sdp->cdev);
1572 sdp->cdev = NULL;
1573
1574 sg_put_dev(sdp);
1575 }
1576
1577 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1578 module_param_named(def_reserved_size, def_reserved_size, int,
1579 S_IRUGO | S_IWUSR);
1580 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1581
1582 MODULE_AUTHOR("Douglas Gilbert");
1583 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1584 MODULE_LICENSE("GPL");
1585 MODULE_VERSION(SG_VERSION_STR);
1586 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1587
1588 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1589 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1590 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1591 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1592
1593 static int __init
1594 init_sg(void)
1595 {
1596 int rc;
1597
1598 if (scatter_elem_sz < PAGE_SIZE) {
1599 scatter_elem_sz = PAGE_SIZE;
1600 scatter_elem_sz_prev = scatter_elem_sz;
1601 }
1602 if (def_reserved_size >= 0)
1603 sg_big_buff = def_reserved_size;
1604 else
1605 def_reserved_size = sg_big_buff;
1606
1607 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1608 SG_MAX_DEVS, "sg");
1609 if (rc)
1610 return rc;
1611 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1612 if ( IS_ERR(sg_sysfs_class) ) {
1613 rc = PTR_ERR(sg_sysfs_class);
1614 goto err_out;
1615 }
1616 sg_sysfs_valid = 1;
1617 rc = scsi_register_interface(&sg_interface);
1618 if (0 == rc) {
1619 #ifdef CONFIG_SCSI_PROC_FS
1620 sg_proc_init();
1621 #endif /* CONFIG_SCSI_PROC_FS */
1622 return 0;
1623 }
1624 class_destroy(sg_sysfs_class);
1625 err_out:
1626 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1627 return rc;
1628 }
1629
1630 static void __exit
1631 exit_sg(void)
1632 {
1633 #ifdef CONFIG_SCSI_PROC_FS
1634 sg_proc_cleanup();
1635 #endif /* CONFIG_SCSI_PROC_FS */
1636 scsi_unregister_interface(&sg_interface);
1637 class_destroy(sg_sysfs_class);
1638 sg_sysfs_valid = 0;
1639 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1640 SG_MAX_DEVS);
1641 idr_destroy(&sg_index_idr);
1642 }
1643
1644 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1645 {
1646 int res;
1647 struct request *rq;
1648 Sg_fd *sfp = srp->parentfp;
1649 sg_io_hdr_t *hp = &srp->header;
1650 int dxfer_len = (int) hp->dxfer_len;
1651 int dxfer_dir = hp->dxfer_direction;
1652 unsigned int iov_count = hp->iovec_count;
1653 Sg_scatter_hold *req_schp = &srp->data;
1654 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1655 struct request_queue *q = sfp->parentdp->device->request_queue;
1656 struct rq_map_data *md, map_data;
1657 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1658
1659 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
1660 dxfer_len));
1661
1662 rq = blk_get_request(q, rw, GFP_ATOMIC);
1663 if (!rq)
1664 return -ENOMEM;
1665
1666 memcpy(rq->cmd, cmd, hp->cmd_len);
1667
1668 rq->cmd_len = hp->cmd_len;
1669 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1670
1671 srp->rq = rq;
1672 rq->end_io_data = srp;
1673 rq->sense = srp->sense_b;
1674 rq->retries = SG_DEFAULT_RETRIES;
1675
1676 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1677 return 0;
1678
1679 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
1680 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
1681 !sfp->parentdp->device->host->unchecked_isa_dma &&
1682 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
1683 md = NULL;
1684 else
1685 md = &map_data;
1686
1687 if (md) {
1688 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen)
1689 sg_link_reserve(sfp, srp, dxfer_len);
1690 else {
1691 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1692 if (res)
1693 return res;
1694 }
1695
1696 md->pages = req_schp->pages;
1697 md->page_order = req_schp->page_order;
1698 md->nr_entries = req_schp->k_use_sg;
1699 md->offset = 0;
1700 md->null_mapped = hp->dxferp ? 0 : 1;
1701 if (dxfer_dir == SG_DXFER_TO_FROM_DEV)
1702 md->from_user = 1;
1703 else
1704 md->from_user = 0;
1705 }
1706
1707 if (unlikely(iov_count > UIO_MAXIOV))
1708 return -EINVAL;
1709
1710 if (iov_count) {
1711 int len, size = sizeof(struct sg_iovec) * iov_count;
1712 struct iovec *iov;
1713
1714 iov = memdup_user(hp->dxferp, size);
1715 if (IS_ERR(iov))
1716 return PTR_ERR(iov);
1717
1718 len = iov_length(iov, iov_count);
1719 if (hp->dxfer_len < len) {
1720 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len);
1721 len = hp->dxfer_len;
1722 }
1723
1724 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov,
1725 iov_count,
1726 len, GFP_ATOMIC);
1727 kfree(iov);
1728 } else
1729 res = blk_rq_map_user(q, rq, md, hp->dxferp,
1730 hp->dxfer_len, GFP_ATOMIC);
1731
1732 if (!res) {
1733 srp->bio = rq->bio;
1734
1735 if (!md) {
1736 req_schp->dio_in_use = 1;
1737 hp->info |= SG_INFO_DIRECT_IO;
1738 }
1739 }
1740 return res;
1741 }
1742
1743 static int sg_finish_rem_req(Sg_request * srp)
1744 {
1745 int ret = 0;
1746
1747 Sg_fd *sfp = srp->parentfp;
1748 Sg_scatter_hold *req_schp = &srp->data;
1749
1750 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1751 if (srp->rq) {
1752 if (srp->bio)
1753 ret = blk_rq_unmap_user(srp->bio);
1754
1755 blk_put_request(srp->rq);
1756 }
1757
1758 if (srp->res_used)
1759 sg_unlink_reserve(sfp, srp);
1760 else
1761 sg_remove_scat(req_schp);
1762
1763 sg_remove_request(sfp, srp);
1764
1765 return ret;
1766 }
1767
1768 static int
1769 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1770 {
1771 int sg_bufflen = tablesize * sizeof(struct page *);
1772 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1773
1774 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1775 if (!schp->pages)
1776 return -ENOMEM;
1777 schp->sglist_len = sg_bufflen;
1778 return tablesize; /* number of scat_gath elements allocated */
1779 }
1780
1781 static int
1782 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1783 {
1784 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1785 int sg_tablesize = sfp->parentdp->sg_tablesize;
1786 int blk_size = buff_size, order;
1787 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1788
1789 if (blk_size < 0)
1790 return -EFAULT;
1791 if (0 == blk_size)
1792 ++blk_size; /* don't know why */
1793 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1794 blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
1795 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1796 buff_size, blk_size));
1797
1798 /* N.B. ret_sz carried into this block ... */
1799 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1800 if (mx_sc_elems < 0)
1801 return mx_sc_elems; /* most likely -ENOMEM */
1802
1803 num = scatter_elem_sz;
1804 if (unlikely(num != scatter_elem_sz_prev)) {
1805 if (num < PAGE_SIZE) {
1806 scatter_elem_sz = PAGE_SIZE;
1807 scatter_elem_sz_prev = PAGE_SIZE;
1808 } else
1809 scatter_elem_sz_prev = num;
1810 }
1811
1812 if (sfp->low_dma)
1813 gfp_mask |= GFP_DMA;
1814
1815 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1816 gfp_mask |= __GFP_ZERO;
1817
1818 order = get_order(num);
1819 retry:
1820 ret_sz = 1 << (PAGE_SHIFT + order);
1821
1822 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1823 k++, rem_sz -= ret_sz) {
1824
1825 num = (rem_sz > scatter_elem_sz_prev) ?
1826 scatter_elem_sz_prev : rem_sz;
1827
1828 schp->pages[k] = alloc_pages(gfp_mask, order);
1829 if (!schp->pages[k])
1830 goto out;
1831
1832 if (num == scatter_elem_sz_prev) {
1833 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1834 scatter_elem_sz = ret_sz;
1835 scatter_elem_sz_prev = ret_sz;
1836 }
1837 }
1838
1839 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1840 "ret_sz=%d\n", k, num, ret_sz));
1841 } /* end of for loop */
1842
1843 schp->page_order = order;
1844 schp->k_use_sg = k;
1845 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1846 "rem_sz=%d\n", k, rem_sz));
1847
1848 schp->bufflen = blk_size;
1849 if (rem_sz > 0) /* must have failed */
1850 return -ENOMEM;
1851 return 0;
1852 out:
1853 for (i = 0; i < k; i++)
1854 __free_pages(schp->pages[i], order);
1855
1856 if (--order >= 0)
1857 goto retry;
1858
1859 return -ENOMEM;
1860 }
1861
1862 static void
1863 sg_remove_scat(Sg_scatter_hold * schp)
1864 {
1865 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1866 if (schp->pages && schp->sglist_len > 0) {
1867 if (!schp->dio_in_use) {
1868 int k;
1869
1870 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1871 SCSI_LOG_TIMEOUT(5, printk(
1872 "sg_remove_scat: k=%d, pg=0x%p\n",
1873 k, schp->pages[k]));
1874 __free_pages(schp->pages[k], schp->page_order);
1875 }
1876
1877 kfree(schp->pages);
1878 }
1879 }
1880 memset(schp, 0, sizeof (*schp));
1881 }
1882
1883 static int
1884 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1885 {
1886 Sg_scatter_hold *schp = &srp->data;
1887 int k, num;
1888
1889 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1890 num_read_xfer));
1891 if ((!outp) || (num_read_xfer <= 0))
1892 return 0;
1893
1894 num = 1 << (PAGE_SHIFT + schp->page_order);
1895 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1896 if (num > num_read_xfer) {
1897 if (__copy_to_user(outp, page_address(schp->pages[k]),
1898 num_read_xfer))
1899 return -EFAULT;
1900 break;
1901 } else {
1902 if (__copy_to_user(outp, page_address(schp->pages[k]),
1903 num))
1904 return -EFAULT;
1905 num_read_xfer -= num;
1906 if (num_read_xfer <= 0)
1907 break;
1908 outp += num;
1909 }
1910 }
1911
1912 return 0;
1913 }
1914
1915 static void
1916 sg_build_reserve(Sg_fd * sfp, int req_size)
1917 {
1918 Sg_scatter_hold *schp = &sfp->reserve;
1919
1920 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1921 do {
1922 if (req_size < PAGE_SIZE)
1923 req_size = PAGE_SIZE;
1924 if (0 == sg_build_indirect(schp, sfp, req_size))
1925 return;
1926 else
1927 sg_remove_scat(schp);
1928 req_size >>= 1; /* divide by 2 */
1929 } while (req_size > (PAGE_SIZE / 2));
1930 }
1931
1932 static void
1933 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1934 {
1935 Sg_scatter_hold *req_schp = &srp->data;
1936 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1937 int k, num, rem;
1938
1939 srp->res_used = 1;
1940 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1941 rem = size;
1942
1943 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1944 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1945 if (rem <= num) {
1946 req_schp->k_use_sg = k + 1;
1947 req_schp->sglist_len = rsv_schp->sglist_len;
1948 req_schp->pages = rsv_schp->pages;
1949
1950 req_schp->bufflen = size;
1951 req_schp->page_order = rsv_schp->page_order;
1952 break;
1953 } else
1954 rem -= num;
1955 }
1956
1957 if (k >= rsv_schp->k_use_sg)
1958 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1959 }
1960
1961 static void
1962 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
1963 {
1964 Sg_scatter_hold *req_schp = &srp->data;
1965
1966 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
1967 (int) req_schp->k_use_sg));
1968 req_schp->k_use_sg = 0;
1969 req_schp->bufflen = 0;
1970 req_schp->pages = NULL;
1971 req_schp->page_order = 0;
1972 req_schp->sglist_len = 0;
1973 sfp->save_scat_len = 0;
1974 srp->res_used = 0;
1975 }
1976
1977 static Sg_request *
1978 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
1979 {
1980 Sg_request *resp;
1981 unsigned long iflags;
1982
1983 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1984 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
1985 /* look for requests that are ready + not SG_IO owned */
1986 if ((1 == resp->done) && (!resp->sg_io_owned) &&
1987 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
1988 resp->done = 2; /* guard against other readers */
1989 break;
1990 }
1991 }
1992 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1993 return resp;
1994 }
1995
1996 /* always adds to end of list */
1997 static Sg_request *
1998 sg_add_request(Sg_fd * sfp)
1999 {
2000 int k;
2001 unsigned long iflags;
2002 Sg_request *resp;
2003 Sg_request *rp = sfp->req_arr;
2004
2005 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2006 resp = sfp->headrp;
2007 if (!resp) {
2008 memset(rp, 0, sizeof (Sg_request));
2009 rp->parentfp = sfp;
2010 resp = rp;
2011 sfp->headrp = resp;
2012 } else {
2013 if (0 == sfp->cmd_q)
2014 resp = NULL; /* command queuing disallowed */
2015 else {
2016 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2017 if (!rp->parentfp)
2018 break;
2019 }
2020 if (k < SG_MAX_QUEUE) {
2021 memset(rp, 0, sizeof (Sg_request));
2022 rp->parentfp = sfp;
2023 while (resp->nextrp)
2024 resp = resp->nextrp;
2025 resp->nextrp = rp;
2026 resp = rp;
2027 } else
2028 resp = NULL;
2029 }
2030 }
2031 if (resp) {
2032 resp->nextrp = NULL;
2033 resp->header.duration = jiffies_to_msecs(jiffies);
2034 }
2035 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2036 return resp;
2037 }
2038
2039 /* Return of 1 for found; 0 for not found */
2040 static int
2041 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2042 {
2043 Sg_request *prev_rp;
2044 Sg_request *rp;
2045 unsigned long iflags;
2046 int res = 0;
2047
2048 if ((!sfp) || (!srp) || (!sfp->headrp))
2049 return res;
2050 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2051 prev_rp = sfp->headrp;
2052 if (srp == prev_rp) {
2053 sfp->headrp = prev_rp->nextrp;
2054 prev_rp->parentfp = NULL;
2055 res = 1;
2056 } else {
2057 while ((rp = prev_rp->nextrp)) {
2058 if (srp == rp) {
2059 prev_rp->nextrp = rp->nextrp;
2060 rp->parentfp = NULL;
2061 res = 1;
2062 break;
2063 }
2064 prev_rp = rp;
2065 }
2066 }
2067 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2068 return res;
2069 }
2070
2071 static Sg_fd *
2072 sg_add_sfp(Sg_device * sdp, int dev)
2073 {
2074 Sg_fd *sfp;
2075 unsigned long iflags;
2076 int bufflen;
2077
2078 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2079 if (!sfp)
2080 return NULL;
2081
2082 init_waitqueue_head(&sfp->read_wait);
2083 rwlock_init(&sfp->rq_list_lock);
2084
2085 kref_init(&sfp->f_ref);
2086 sfp->timeout = SG_DEFAULT_TIMEOUT;
2087 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2088 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2089 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2090 sdp->device->host->unchecked_isa_dma : 1;
2091 sfp->cmd_q = SG_DEF_COMMAND_Q;
2092 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2093 sfp->parentdp = sdp;
2094 write_lock_irqsave(&sg_index_lock, iflags);
2095 list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
2096 write_unlock_irqrestore(&sg_index_lock, iflags);
2097 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2098 if (unlikely(sg_big_buff != def_reserved_size))
2099 sg_big_buff = def_reserved_size;
2100
2101 bufflen = min_t(int, sg_big_buff,
2102 queue_max_sectors(sdp->device->request_queue) * 512);
2103 sg_build_reserve(sfp, bufflen);
2104 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2105 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2106
2107 kref_get(&sdp->d_ref);
2108 __module_get(THIS_MODULE);
2109 return sfp;
2110 }
2111
2112 static void sg_remove_sfp_usercontext(struct work_struct *work)
2113 {
2114 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work);
2115 struct sg_device *sdp = sfp->parentdp;
2116
2117 /* Cleanup any responses which were never read(). */
2118 while (sfp->headrp)
2119 sg_finish_rem_req(sfp->headrp);
2120
2121 if (sfp->reserve.bufflen > 0) {
2122 SCSI_LOG_TIMEOUT(6,
2123 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2124 (int) sfp->reserve.bufflen,
2125 (int) sfp->reserve.k_use_sg));
2126 sg_remove_scat(&sfp->reserve);
2127 }
2128
2129 SCSI_LOG_TIMEOUT(6,
2130 printk("sg_remove_sfp: %s, sfp=0x%p\n",
2131 sdp->disk->disk_name,
2132 sfp));
2133 kfree(sfp);
2134
2135 scsi_device_put(sdp->device);
2136 sg_put_dev(sdp);
2137 module_put(THIS_MODULE);
2138 }
2139
2140 static void sg_remove_sfp(struct kref *kref)
2141 {
2142 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref);
2143 struct sg_device *sdp = sfp->parentdp;
2144 unsigned long iflags;
2145
2146 write_lock_irqsave(&sg_index_lock, iflags);
2147 list_del(&sfp->sfd_siblings);
2148 write_unlock_irqrestore(&sg_index_lock, iflags);
2149 wake_up_interruptible(&sdp->o_excl_wait);
2150
2151 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext);
2152 schedule_work(&sfp->ew.work);
2153 }
2154
2155 static int
2156 sg_res_in_use(Sg_fd * sfp)
2157 {
2158 const Sg_request *srp;
2159 unsigned long iflags;
2160
2161 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2162 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2163 if (srp->res_used)
2164 break;
2165 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2166 return srp ? 1 : 0;
2167 }
2168
2169 #ifdef CONFIG_SCSI_PROC_FS
2170 static int
2171 sg_idr_max_id(int id, void *p, void *data)
2172 {
2173 int *k = data;
2174
2175 if (*k < id)
2176 *k = id;
2177
2178 return 0;
2179 }
2180
2181 static int
2182 sg_last_dev(void)
2183 {
2184 int k = -1;
2185 unsigned long iflags;
2186
2187 read_lock_irqsave(&sg_index_lock, iflags);
2188 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2189 read_unlock_irqrestore(&sg_index_lock, iflags);
2190 return k + 1; /* origin 1 */
2191 }
2192 #endif
2193
2194 /* must be called with sg_index_lock held */
2195 static Sg_device *sg_lookup_dev(int dev)
2196 {
2197 return idr_find(&sg_index_idr, dev);
2198 }
2199
2200 static Sg_device *sg_get_dev(int dev)
2201 {
2202 struct sg_device *sdp;
2203 unsigned long flags;
2204
2205 read_lock_irqsave(&sg_index_lock, flags);
2206 sdp = sg_lookup_dev(dev);
2207 if (!sdp)
2208 sdp = ERR_PTR(-ENXIO);
2209 else if (sdp->detached) {
2210 /* If sdp->detached, then the refcount may already be 0, in
2211 * which case it would be a bug to do kref_get().
2212 */
2213 sdp = ERR_PTR(-ENODEV);
2214 } else
2215 kref_get(&sdp->d_ref);
2216 read_unlock_irqrestore(&sg_index_lock, flags);
2217
2218 return sdp;
2219 }
2220
2221 static void sg_put_dev(struct sg_device *sdp)
2222 {
2223 kref_put(&sdp->d_ref, sg_device_destroy);
2224 }
2225
2226 #ifdef CONFIG_SCSI_PROC_FS
2227
2228 static struct proc_dir_entry *sg_proc_sgp = NULL;
2229
2230 static char sg_proc_sg_dirname[] = "scsi/sg";
2231
2232 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2233
2234 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2235 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2236 size_t count, loff_t *off);
2237 static const struct file_operations adio_fops = {
2238 .owner = THIS_MODULE,
2239 .open = sg_proc_single_open_adio,
2240 .read = seq_read,
2241 .llseek = seq_lseek,
2242 .write = sg_proc_write_adio,
2243 .release = single_release,
2244 };
2245
2246 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2247 static ssize_t sg_proc_write_dressz(struct file *filp,
2248 const char __user *buffer, size_t count, loff_t *off);
2249 static const struct file_operations dressz_fops = {
2250 .owner = THIS_MODULE,
2251 .open = sg_proc_single_open_dressz,
2252 .read = seq_read,
2253 .llseek = seq_lseek,
2254 .write = sg_proc_write_dressz,
2255 .release = single_release,
2256 };
2257
2258 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2259 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2260 static const struct file_operations version_fops = {
2261 .owner = THIS_MODULE,
2262 .open = sg_proc_single_open_version,
2263 .read = seq_read,
2264 .llseek = seq_lseek,
2265 .release = single_release,
2266 };
2267
2268 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2269 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2270 static const struct file_operations devhdr_fops = {
2271 .owner = THIS_MODULE,
2272 .open = sg_proc_single_open_devhdr,
2273 .read = seq_read,
2274 .llseek = seq_lseek,
2275 .release = single_release,
2276 };
2277
2278 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2279 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2280 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2281 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2282 static void dev_seq_stop(struct seq_file *s, void *v);
2283 static const struct file_operations dev_fops = {
2284 .owner = THIS_MODULE,
2285 .open = sg_proc_open_dev,
2286 .read = seq_read,
2287 .llseek = seq_lseek,
2288 .release = seq_release,
2289 };
2290 static const struct seq_operations dev_seq_ops = {
2291 .start = dev_seq_start,
2292 .next = dev_seq_next,
2293 .stop = dev_seq_stop,
2294 .show = sg_proc_seq_show_dev,
2295 };
2296
2297 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2298 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2299 static const struct file_operations devstrs_fops = {
2300 .owner = THIS_MODULE,
2301 .open = sg_proc_open_devstrs,
2302 .read = seq_read,
2303 .llseek = seq_lseek,
2304 .release = seq_release,
2305 };
2306 static const struct seq_operations devstrs_seq_ops = {
2307 .start = dev_seq_start,
2308 .next = dev_seq_next,
2309 .stop = dev_seq_stop,
2310 .show = sg_proc_seq_show_devstrs,
2311 };
2312
2313 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2314 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2315 static const struct file_operations debug_fops = {
2316 .owner = THIS_MODULE,
2317 .open = sg_proc_open_debug,
2318 .read = seq_read,
2319 .llseek = seq_lseek,
2320 .release = seq_release,
2321 };
2322 static const struct seq_operations debug_seq_ops = {
2323 .start = dev_seq_start,
2324 .next = dev_seq_next,
2325 .stop = dev_seq_stop,
2326 .show = sg_proc_seq_show_debug,
2327 };
2328
2329
2330 struct sg_proc_leaf {
2331 const char * name;
2332 const struct file_operations * fops;
2333 };
2334
2335 static const struct sg_proc_leaf sg_proc_leaf_arr[] = {
2336 {"allow_dio", &adio_fops},
2337 {"debug", &debug_fops},
2338 {"def_reserved_size", &dressz_fops},
2339 {"device_hdr", &devhdr_fops},
2340 {"devices", &dev_fops},
2341 {"device_strs", &devstrs_fops},
2342 {"version", &version_fops}
2343 };
2344
2345 static int
2346 sg_proc_init(void)
2347 {
2348 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2349 int k;
2350
2351 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2352 if (!sg_proc_sgp)
2353 return 1;
2354 for (k = 0; k < num_leaves; ++k) {
2355 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k];
2356 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2357 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2358 }
2359 return 0;
2360 }
2361
2362 static void
2363 sg_proc_cleanup(void)
2364 {
2365 int k;
2366 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2367
2368 if (!sg_proc_sgp)
2369 return;
2370 for (k = 0; k < num_leaves; ++k)
2371 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2372 remove_proc_entry(sg_proc_sg_dirname, NULL);
2373 }
2374
2375
2376 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2377 {
2378 seq_printf(s, "%d\n", *((int *)s->private));
2379 return 0;
2380 }
2381
2382 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2383 {
2384 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2385 }
2386
2387 static ssize_t
2388 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2389 size_t count, loff_t *off)
2390 {
2391 int err;
2392 unsigned long num;
2393
2394 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2395 return -EACCES;
2396 err = kstrtoul_from_user(buffer, count, 0, &num);
2397 if (err)
2398 return err;
2399 sg_allow_dio = num ? 1 : 0;
2400 return count;
2401 }
2402
2403 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2404 {
2405 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2406 }
2407
2408 static ssize_t
2409 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2410 size_t count, loff_t *off)
2411 {
2412 int err;
2413 unsigned long k = ULONG_MAX;
2414
2415 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2416 return -EACCES;
2417
2418 err = kstrtoul_from_user(buffer, count, 0, &k);
2419 if (err)
2420 return err;
2421 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2422 sg_big_buff = k;
2423 return count;
2424 }
2425 return -ERANGE;
2426 }
2427
2428 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2429 {
2430 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2431 sg_version_date);
2432 return 0;
2433 }
2434
2435 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2436 {
2437 return single_open(file, sg_proc_seq_show_version, NULL);
2438 }
2439
2440 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2441 {
2442 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2443 "online\n");
2444 return 0;
2445 }
2446
2447 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2448 {
2449 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2450 }
2451
2452 struct sg_proc_deviter {
2453 loff_t index;
2454 size_t max;
2455 };
2456
2457 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2458 {
2459 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2460
2461 s->private = it;
2462 if (! it)
2463 return NULL;
2464
2465 it->index = *pos;
2466 it->max = sg_last_dev();
2467 if (it->index >= it->max)
2468 return NULL;
2469 return it;
2470 }
2471
2472 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2473 {
2474 struct sg_proc_deviter * it = s->private;
2475
2476 *pos = ++it->index;
2477 return (it->index < it->max) ? it : NULL;
2478 }
2479
2480 static void dev_seq_stop(struct seq_file *s, void *v)
2481 {
2482 kfree(s->private);
2483 }
2484
2485 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2486 {
2487 return seq_open(file, &dev_seq_ops);
2488 }
2489
2490 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2491 {
2492 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2493 Sg_device *sdp;
2494 struct scsi_device *scsidp;
2495 unsigned long iflags;
2496
2497 read_lock_irqsave(&sg_index_lock, iflags);
2498 sdp = it ? sg_lookup_dev(it->index) : NULL;
2499 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2500 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2501 scsidp->host->host_no, scsidp->channel,
2502 scsidp->id, scsidp->lun, (int) scsidp->type,
2503 1,
2504 (int) scsidp->queue_depth,
2505 (int) scsidp->device_busy,
2506 (int) scsi_device_online(scsidp));
2507 else
2508 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2509 read_unlock_irqrestore(&sg_index_lock, iflags);
2510 return 0;
2511 }
2512
2513 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2514 {
2515 return seq_open(file, &devstrs_seq_ops);
2516 }
2517
2518 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2519 {
2520 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2521 Sg_device *sdp;
2522 struct scsi_device *scsidp;
2523 unsigned long iflags;
2524
2525 read_lock_irqsave(&sg_index_lock, iflags);
2526 sdp = it ? sg_lookup_dev(it->index) : NULL;
2527 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2528 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2529 scsidp->vendor, scsidp->model, scsidp->rev);
2530 else
2531 seq_printf(s, "<no active device>\n");
2532 read_unlock_irqrestore(&sg_index_lock, iflags);
2533 return 0;
2534 }
2535
2536 /* must be called while holding sg_index_lock */
2537 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2538 {
2539 int k, m, new_interface, blen, usg;
2540 Sg_request *srp;
2541 Sg_fd *fp;
2542 const sg_io_hdr_t *hp;
2543 const char * cp;
2544 unsigned int ms;
2545
2546 k = 0;
2547 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) {
2548 k++;
2549 read_lock(&fp->rq_list_lock); /* irqs already disabled */
2550 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2551 "(res)sgat=%d low_dma=%d\n", k,
2552 jiffies_to_msecs(fp->timeout),
2553 fp->reserve.bufflen,
2554 (int) fp->reserve.k_use_sg,
2555 (int) fp->low_dma);
2556 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n",
2557 (int) fp->cmd_q, (int) fp->force_packid,
2558 (int) fp->keep_orphan);
2559 for (m = 0, srp = fp->headrp;
2560 srp != NULL;
2561 ++m, srp = srp->nextrp) {
2562 hp = &srp->header;
2563 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2564 if (srp->res_used) {
2565 if (new_interface &&
2566 (SG_FLAG_MMAP_IO & hp->flags))
2567 cp = " mmap>> ";
2568 else
2569 cp = " rb>> ";
2570 } else {
2571 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2572 cp = " dio>> ";
2573 else
2574 cp = " ";
2575 }
2576 seq_printf(s, cp);
2577 blen = srp->data.bufflen;
2578 usg = srp->data.k_use_sg;
2579 seq_printf(s, srp->done ?
2580 ((1 == srp->done) ? "rcv:" : "fin:")
2581 : "act:");
2582 seq_printf(s, " id=%d blen=%d",
2583 srp->header.pack_id, blen);
2584 if (srp->done)
2585 seq_printf(s, " dur=%d", hp->duration);
2586 else {
2587 ms = jiffies_to_msecs(jiffies);
2588 seq_printf(s, " t_o/elap=%d/%d",
2589 (new_interface ? hp->timeout :
2590 jiffies_to_msecs(fp->timeout)),
2591 (ms > hp->duration ? ms - hp->duration : 0));
2592 }
2593 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2594 (int) srp->data.cmd_opcode);
2595 }
2596 if (0 == m)
2597 seq_printf(s, " No requests active\n");
2598 read_unlock(&fp->rq_list_lock);
2599 }
2600 }
2601
2602 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2603 {
2604 return seq_open(file, &debug_seq_ops);
2605 }
2606
2607 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2608 {
2609 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2610 Sg_device *sdp;
2611 unsigned long iflags;
2612
2613 if (it && (0 == it->index)) {
2614 seq_printf(s, "max_active_device=%d(origin 1)\n",
2615 (int)it->max);
2616 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2617 }
2618
2619 read_lock_irqsave(&sg_index_lock, iflags);
2620 sdp = it ? sg_lookup_dev(it->index) : NULL;
2621 if (sdp && !list_empty(&sdp->sfds)) {
2622 struct scsi_device *scsidp = sdp->device;
2623
2624 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name);
2625 if (sdp->detached)
2626 seq_printf(s, "detached pending close ");
2627 else
2628 seq_printf
2629 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2630 scsidp->host->host_no,
2631 scsidp->channel, scsidp->id,
2632 scsidp->lun,
2633 scsidp->host->hostt->emulated);
2634 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2635 sdp->sg_tablesize, get_exclude(sdp));
2636 sg_proc_debug_helper(s, sdp);
2637 }
2638 read_unlock_irqrestore(&sg_index_lock, iflags);
2639 return 0;
2640 }
2641
2642 #endif /* CONFIG_SCSI_PROC_FS */
2643
2644 module_init(init_sg);
2645 module_exit(exit_sg);
kernel source for telekom puls (alcatel/mediatek)