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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/sg.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/scsi/sg.c')
-rw-r--r--drivers/scsi/sg.c3092
1 files changed, 3092 insertions, 0 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
new file mode 100644
index 000000000000..fd72d73bb244
--- /dev/null
+++ b/drivers/scsi/sg.c
@@ -0,0 +1,3092 @@
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
21static int sg_version_num = 30532; /* 2 digits for each component */
22#define SG_VERSION_STR "3.5.32"
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/config.h>
32#include <linux/module.h>
33
34#include <linux/fs.h>
35#include <linux/kernel.h>
36#include <linux/sched.h>
37#include <linux/string.h>
38#include <linux/mm.h>
39#include <linux/errno.h>
40#include <linux/mtio.h>
41#include <linux/ioctl.h>
42#include <linux/fcntl.h>
43#include <linux/init.h>
44#include <linux/poll.h>
45#include <linux/smp_lock.h>
46#include <linux/moduleparam.h>
47#include <linux/devfs_fs_kernel.h>
48#include <linux/cdev.h>
49#include <linux/seq_file.h>
50#include <linux/blkdev.h>
51#include <linux/delay.h>
52
53#include "scsi.h"
54#include <scsi/scsi_host.h>
55#include <scsi/scsi_driver.h>
56#include <scsi/scsi_ioctl.h>
57#include <scsi/sg.h>
58
59#include "scsi_logging.h"
60
61#ifdef CONFIG_SCSI_PROC_FS
62#include <linux/proc_fs.h>
63static char *sg_version_date = "20050117";
64
65static int sg_proc_init(void);
66static void sg_proc_cleanup(void);
67#endif
68
69#ifndef LINUX_VERSION_CODE
70#include <linux/version.h>
71#endif /* LINUX_VERSION_CODE */
72
73#define SG_ALLOW_DIO_DEF 0
74#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
75
76#define SG_MAX_DEVS 32768
77
78/*
79 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
80 * Then when using 32 bit integers x * m may overflow during the calculation.
81 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
82 * calculates the same, but prevents the overflow when both m and d
83 * are "small" numbers (like HZ and USER_HZ).
84 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
85 * in 32 bits.
86 */
87#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
88
89#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
90
91int sg_big_buff = SG_DEF_RESERVED_SIZE;
92/* N.B. This variable is readable and writeable via
93 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
94 of this size (or less if there is not enough memory) will be reserved
95 for use by this file descriptor. [Deprecated usage: this variable is also
96 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
97 the kernel (i.e. it is not a module).] */
98static int def_reserved_size = -1; /* picks up init parameter */
99static int sg_allow_dio = SG_ALLOW_DIO_DEF;
100
101#define SG_SECTOR_SZ 512
102#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
103
104#define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
105
106static int sg_add(struct class_device *);
107static void sg_remove(struct class_device *);
108
109static Scsi_Request *dummy_cmdp; /* only used for sizeof */
110
111static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
112 file descriptor list for device */
113
114static struct class_interface sg_interface = {
115 .add = sg_add,
116 .remove = sg_remove,
117};
118
119typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
120 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
121 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
122 unsigned bufflen; /* Size of (aggregate) data buffer */
123 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
124 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
125 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
126 unsigned char cmd_opcode; /* first byte of command */
127} Sg_scatter_hold;
128
129struct sg_device; /* forward declarations */
130struct sg_fd;
131
132typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
133 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
134 struct sg_request *nextrp; /* NULL -> tail request (slist) */
135 struct sg_fd *parentfp; /* NULL -> not in use */
136 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
137 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
138 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
139 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
140 char orphan; /* 1 -> drop on sight, 0 -> normal */
141 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
142 volatile char done; /* 0->before bh, 1->before read, 2->read */
143} Sg_request;
144
145typedef struct sg_fd { /* holds the state of a file descriptor */
146 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
147 struct sg_device *parentdp; /* owning device */
148 wait_queue_head_t read_wait; /* queue read until command done */
149 rwlock_t rq_list_lock; /* protect access to list in req_arr */
150 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
151 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
152 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
153 unsigned save_scat_len; /* original length of trunc. scat. element */
154 Sg_request *headrp; /* head of request slist, NULL->empty */
155 struct fasync_struct *async_qp; /* used by asynchronous notification */
156 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
157 char low_dma; /* as in parent but possibly overridden to 1 */
158 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
159 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
160 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
161 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
162 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
163 char mmap_called; /* 0 -> mmap() never called on this fd */
164} Sg_fd;
165
166typedef struct sg_device { /* holds the state of each scsi generic device */
167 struct scsi_device *device;
168 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
169 int sg_tablesize; /* adapter's max scatter-gather table size */
170 Sg_fd *headfp; /* first open fd belonging to this device */
171 volatile char detached; /* 0->attached, 1->detached pending removal */
172 volatile char exclude; /* opened for exclusive access */
173 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 struct gendisk *disk;
175 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
176} Sg_device;
177
178static int sg_fasync(int fd, struct file *filp, int mode);
179static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
180static int sg_start_req(Sg_request * srp);
181static void sg_finish_rem_req(Sg_request * srp);
182static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
183static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
184 int tablesize);
185static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
186 Sg_request * srp);
187static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
188 int blocking, int read_only, Sg_request ** o_srp);
189static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
191static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
192 int wr_xf, int *countp, unsigned char __user **up);
193static int sg_write_xfer(Sg_request * srp);
194static int sg_read_xfer(Sg_request * srp);
195static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
196static void sg_remove_scat(Sg_scatter_hold * schp);
197static void sg_build_reserve(Sg_fd * sfp, int req_size);
198static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
199static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
200static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
201static void sg_page_free(char *buff, int size);
202static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
203static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
204static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
205static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
206static Sg_request *sg_add_request(Sg_fd * sfp);
207static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
208static int sg_res_in_use(Sg_fd * sfp);
209static int sg_allow_access(unsigned char opcode, char dev_type);
210static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
211static Sg_device *sg_get_dev(int dev);
212static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
213#ifdef CONFIG_SCSI_PROC_FS
214static int sg_last_dev(void);
215#endif
216
217static Sg_device **sg_dev_arr = NULL;
218static int sg_dev_max;
219static int sg_nr_dev;
220
221#define SZ_SG_HEADER sizeof(struct sg_header)
222#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
223#define SZ_SG_IOVEC sizeof(sg_iovec_t)
224#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
225
226static int
227sg_open(struct inode *inode, struct file *filp)
228{
229 int dev = iminor(inode);
230 int flags = filp->f_flags;
231 Sg_device *sdp;
232 Sg_fd *sfp;
233 int res;
234 int retval;
235
236 nonseekable_open(inode, filp);
237 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
238 sdp = sg_get_dev(dev);
239 if ((!sdp) || (!sdp->device))
240 return -ENXIO;
241 if (sdp->detached)
242 return -ENODEV;
243
244 /* This driver's module count bumped by fops_get in <linux/fs.h> */
245 /* Prevent the device driver from vanishing while we sleep */
246 retval = scsi_device_get(sdp->device);
247 if (retval)
248 return retval;
249
250 if (!((flags & O_NONBLOCK) ||
251 scsi_block_when_processing_errors(sdp->device))) {
252 retval = -ENXIO;
253 /* we are in error recovery for this device */
254 goto error_out;
255 }
256
257 if (flags & O_EXCL) {
258 if (O_RDONLY == (flags & O_ACCMODE)) {
259 retval = -EPERM; /* Can't lock it with read only access */
260 goto error_out;
261 }
262 if (sdp->headfp && (flags & O_NONBLOCK)) {
263 retval = -EBUSY;
264 goto error_out;
265 }
266 res = 0;
267 __wait_event_interruptible(sdp->o_excl_wait,
268 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
269 if (res) {
270 retval = res; /* -ERESTARTSYS because signal hit process */
271 goto error_out;
272 }
273 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
274 if (flags & O_NONBLOCK) {
275 retval = -EBUSY;
276 goto error_out;
277 }
278 res = 0;
279 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
280 res);
281 if (res) {
282 retval = res; /* -ERESTARTSYS because signal hit process */
283 goto error_out;
284 }
285 }
286 if (sdp->detached) {
287 retval = -ENODEV;
288 goto error_out;
289 }
290 if (!sdp->headfp) { /* no existing opens on this device */
291 sdp->sgdebug = 0;
292 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
293 }
294 if ((sfp = sg_add_sfp(sdp, dev)))
295 filp->private_data = sfp;
296 else {
297 if (flags & O_EXCL)
298 sdp->exclude = 0; /* undo if error */
299 retval = -ENOMEM;
300 goto error_out;
301 }
302 return 0;
303
304 error_out:
305 scsi_device_put(sdp->device);
306 return retval;
307}
308
309/* Following function was formerly called 'sg_close' */
310static int
311sg_release(struct inode *inode, struct file *filp)
312{
313 Sg_device *sdp;
314 Sg_fd *sfp;
315
316 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
317 return -ENXIO;
318 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
319 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
320 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
321 if (!sdp->detached) {
322 scsi_device_put(sdp->device);
323 }
324 sdp->exclude = 0;
325 wake_up_interruptible(&sdp->o_excl_wait);
326 }
327 return 0;
328}
329
330static ssize_t
331sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
332{
333 int res;
334 Sg_device *sdp;
335 Sg_fd *sfp;
336 Sg_request *srp;
337 int req_pack_id = -1;
338 struct sg_header old_hdr;
339 sg_io_hdr_t new_hdr;
340 sg_io_hdr_t *hp;
341
342 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
343 return -ENXIO;
344 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
345 sdp->disk->disk_name, (int) count));
346 if (!access_ok(VERIFY_WRITE, buf, count))
347 return -EFAULT;
348 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
349 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
350 return -EFAULT;
351 if (old_hdr.reply_len < 0) {
352 if (count >= SZ_SG_IO_HDR) {
353 if (__copy_from_user
354 (&new_hdr, buf, SZ_SG_IO_HDR))
355 return -EFAULT;
356 req_pack_id = new_hdr.pack_id;
357 }
358 } else
359 req_pack_id = old_hdr.pack_id;
360 }
361 srp = sg_get_rq_mark(sfp, req_pack_id);
362 if (!srp) { /* now wait on packet to arrive */
363 if (sdp->detached)
364 return -ENODEV;
365 if (filp->f_flags & O_NONBLOCK)
366 return -EAGAIN;
367 while (1) {
368 res = 0; /* following is a macro that beats race condition */
369 __wait_event_interruptible(sfp->read_wait,
370 (sdp->detached || (srp = sg_get_rq_mark(sfp, req_pack_id))),
371 res);
372 if (sdp->detached)
373 return -ENODEV;
374 if (0 == res)
375 break;
376 return res; /* -ERESTARTSYS because signal hit process */
377 }
378 }
379 if (srp->header.interface_id != '\0')
380 return sg_new_read(sfp, buf, count, srp);
381
382 hp = &srp->header;
383 memset(&old_hdr, 0, SZ_SG_HEADER);
384 old_hdr.reply_len = (int) hp->timeout;
385 old_hdr.pack_len = old_hdr.reply_len; /* very old, strange behaviour */
386 old_hdr.pack_id = hp->pack_id;
387 old_hdr.twelve_byte =
388 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
389 old_hdr.target_status = hp->masked_status;
390 old_hdr.host_status = hp->host_status;
391 old_hdr.driver_status = hp->driver_status;
392 if ((CHECK_CONDITION & hp->masked_status) ||
393 (DRIVER_SENSE & hp->driver_status))
394 memcpy(old_hdr.sense_buffer, srp->sense_b,
395 sizeof (old_hdr.sense_buffer));
396 switch (hp->host_status) {
397 /* This setup of 'result' is for backward compatibility and is best
398 ignored by the user who should use target, host + driver status */
399 case DID_OK:
400 case DID_PASSTHROUGH:
401 case DID_SOFT_ERROR:
402 old_hdr.result = 0;
403 break;
404 case DID_NO_CONNECT:
405 case DID_BUS_BUSY:
406 case DID_TIME_OUT:
407 old_hdr.result = EBUSY;
408 break;
409 case DID_BAD_TARGET:
410 case DID_ABORT:
411 case DID_PARITY:
412 case DID_RESET:
413 case DID_BAD_INTR:
414 old_hdr.result = EIO;
415 break;
416 case DID_ERROR:
417 old_hdr.result = (srp->sense_b[0] == 0 &&
418 hp->masked_status == GOOD) ? 0 : EIO;
419 break;
420 default:
421 old_hdr.result = EIO;
422 break;
423 }
424
425 /* Now copy the result back to the user buffer. */
426 if (count >= SZ_SG_HEADER) {
427 if (__copy_to_user(buf, &old_hdr, SZ_SG_HEADER))
428 return -EFAULT;
429 buf += SZ_SG_HEADER;
430 if (count > old_hdr.reply_len)
431 count = old_hdr.reply_len;
432 if (count > SZ_SG_HEADER) {
433 if ((res =
434 sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)))
435 return -EFAULT;
436 }
437 } else
438 count = (old_hdr.result == 0) ? 0 : -EIO;
439 sg_finish_rem_req(srp);
440 return count;
441}
442
443static ssize_t
444sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
445{
446 sg_io_hdr_t *hp = &srp->header;
447 int err = 0;
448 int len;
449
450 if (count < SZ_SG_IO_HDR) {
451 err = -EINVAL;
452 goto err_out;
453 }
454 hp->sb_len_wr = 0;
455 if ((hp->mx_sb_len > 0) && hp->sbp) {
456 if ((CHECK_CONDITION & hp->masked_status) ||
457 (DRIVER_SENSE & hp->driver_status)) {
458 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
459 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
460 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
461 len = (len > sb_len) ? sb_len : len;
462 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
463 err = -EFAULT;
464 goto err_out;
465 }
466 hp->sb_len_wr = len;
467 }
468 }
469 if (hp->masked_status || hp->host_status || hp->driver_status)
470 hp->info |= SG_INFO_CHECK;
471 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
472 err = -EFAULT;
473 goto err_out;
474 }
475 err = sg_read_xfer(srp);
476 err_out:
477 sg_finish_rem_req(srp);
478 return (0 == err) ? count : err;
479}
480
481static ssize_t
482sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
483{
484 int mxsize, cmd_size, k;
485 int input_size, blocking;
486 unsigned char opcode;
487 Sg_device *sdp;
488 Sg_fd *sfp;
489 Sg_request *srp;
490 struct sg_header old_hdr;
491 sg_io_hdr_t *hp;
492 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
493
494 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
495 return -ENXIO;
496 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
497 sdp->disk->disk_name, (int) count));
498 if (sdp->detached)
499 return -ENODEV;
500 if (!((filp->f_flags & O_NONBLOCK) ||
501 scsi_block_when_processing_errors(sdp->device)))
502 return -ENXIO;
503
504 if (!access_ok(VERIFY_READ, buf, count))
505 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
506 if (count < SZ_SG_HEADER)
507 return -EIO;
508 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
509 return -EFAULT;
510 blocking = !(filp->f_flags & O_NONBLOCK);
511 if (old_hdr.reply_len < 0)
512 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
513 if (count < (SZ_SG_HEADER + 6))
514 return -EIO; /* The minimum scsi command length is 6 bytes. */
515
516 if (!(srp = sg_add_request(sfp))) {
517 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
518 return -EDOM;
519 }
520 buf += SZ_SG_HEADER;
521 __get_user(opcode, buf);
522 if (sfp->next_cmd_len > 0) {
523 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
524 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
525 sfp->next_cmd_len = 0;
526 sg_remove_request(sfp, srp);
527 return -EIO;
528 }
529 cmd_size = sfp->next_cmd_len;
530 sfp->next_cmd_len = 0; /* reset so only this write() effected */
531 } else {
532 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
533 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
534 cmd_size = 12;
535 }
536 SCSI_LOG_TIMEOUT(4, printk(
537 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
538/* Determine buffer size. */
539 input_size = count - cmd_size;
540 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
541 mxsize -= SZ_SG_HEADER;
542 input_size -= SZ_SG_HEADER;
543 if (input_size < 0) {
544 sg_remove_request(sfp, srp);
545 return -EIO; /* User did not pass enough bytes for this command. */
546 }
547 hp = &srp->header;
548 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
549 hp->cmd_len = (unsigned char) cmd_size;
550 hp->iovec_count = 0;
551 hp->mx_sb_len = 0;
552 if (input_size > 0)
553 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
554 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
555 else
556 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
557 hp->dxfer_len = mxsize;
558 hp->dxferp = (char __user *)buf + cmd_size;
559 hp->sbp = NULL;
560 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
561 hp->flags = input_size; /* structure abuse ... */
562 hp->pack_id = old_hdr.pack_id;
563 hp->usr_ptr = NULL;
564 if (__copy_from_user(cmnd, buf, cmd_size))
565 return -EFAULT;
566 /*
567 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
568 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
569 * is a non-zero input_size, so emit a warning.
570 */
571 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
572 if (printk_ratelimit())
573 printk(KERN_WARNING
574 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
575 "guessing data in;\n" KERN_WARNING " "
576 "program %s not setting count and/or reply_len properly\n",
577 old_hdr.reply_len - (int)SZ_SG_HEADER,
578 input_size, (unsigned int) cmnd[0],
579 current->comm);
580 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
581 return (k < 0) ? k : count;
582}
583
584static ssize_t
585sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
586 int blocking, int read_only, Sg_request ** o_srp)
587{
588 int k;
589 Sg_request *srp;
590 sg_io_hdr_t *hp;
591 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
592 int timeout;
593 unsigned long ul_timeout;
594
595 if (count < SZ_SG_IO_HDR)
596 return -EINVAL;
597 if (!access_ok(VERIFY_READ, buf, count))
598 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
599
600 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
601 if (!(srp = sg_add_request(sfp))) {
602 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
603 return -EDOM;
604 }
605 hp = &srp->header;
606 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
607 sg_remove_request(sfp, srp);
608 return -EFAULT;
609 }
610 if (hp->interface_id != 'S') {
611 sg_remove_request(sfp, srp);
612 return -ENOSYS;
613 }
614 if (hp->flags & SG_FLAG_MMAP_IO) {
615 if (hp->dxfer_len > sfp->reserve.bufflen) {
616 sg_remove_request(sfp, srp);
617 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
618 }
619 if (hp->flags & SG_FLAG_DIRECT_IO) {
620 sg_remove_request(sfp, srp);
621 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
622 }
623 if (sg_res_in_use(sfp)) {
624 sg_remove_request(sfp, srp);
625 return -EBUSY; /* reserve buffer already being used */
626 }
627 }
628 ul_timeout = msecs_to_jiffies(srp->header.timeout);
629 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
630 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
631 sg_remove_request(sfp, srp);
632 return -EMSGSIZE;
633 }
634 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
635 sg_remove_request(sfp, srp);
636 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
637 }
638 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
639 sg_remove_request(sfp, srp);
640 return -EFAULT;
641 }
642 if (read_only &&
643 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
644 sg_remove_request(sfp, srp);
645 return -EPERM;
646 }
647 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
648 if (k < 0)
649 return k;
650 if (o_srp)
651 *o_srp = srp;
652 return count;
653}
654
655static int
656sg_common_write(Sg_fd * sfp, Sg_request * srp,
657 unsigned char *cmnd, int timeout, int blocking)
658{
659 int k;
660 Scsi_Request *SRpnt;
661 Sg_device *sdp = sfp->parentdp;
662 sg_io_hdr_t *hp = &srp->header;
663 request_queue_t *q;
664
665 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
666 hp->status = 0;
667 hp->masked_status = 0;
668 hp->msg_status = 0;
669 hp->info = 0;
670 hp->host_status = 0;
671 hp->driver_status = 0;
672 hp->resid = 0;
673 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
674 (int) cmnd[0], (int) hp->cmd_len));
675
676 if ((k = sg_start_req(srp))) {
677 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
678 sg_finish_rem_req(srp);
679 return k; /* probably out of space --> ENOMEM */
680 }
681 if ((k = sg_write_xfer(srp))) {
682 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
683 sg_finish_rem_req(srp);
684 return k;
685 }
686 if (sdp->detached) {
687 sg_finish_rem_req(srp);
688 return -ENODEV;
689 }
690 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
691 if (SRpnt == NULL) {
692 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
693 sg_finish_rem_req(srp);
694 return -ENOMEM;
695 }
696
697 srp->my_cmdp = SRpnt;
698 q = SRpnt->sr_device->request_queue;
699 SRpnt->sr_request->rq_disk = sdp->disk;
700 SRpnt->sr_sense_buffer[0] = 0;
701 SRpnt->sr_cmd_len = hp->cmd_len;
702 SRpnt->sr_use_sg = srp->data.k_use_sg;
703 SRpnt->sr_sglist_len = srp->data.sglist_len;
704 SRpnt->sr_bufflen = srp->data.bufflen;
705 SRpnt->sr_underflow = 0;
706 SRpnt->sr_buffer = srp->data.buffer;
707 switch (hp->dxfer_direction) {
708 case SG_DXFER_TO_FROM_DEV:
709 case SG_DXFER_FROM_DEV:
710 SRpnt->sr_data_direction = SCSI_DATA_READ;
711 break;
712 case SG_DXFER_TO_DEV:
713 SRpnt->sr_data_direction = SCSI_DATA_WRITE;
714 break;
715 case SG_DXFER_UNKNOWN:
716 SRpnt->sr_data_direction = SCSI_DATA_UNKNOWN;
717 break;
718 default:
719 SRpnt->sr_data_direction = SCSI_DATA_NONE;
720 break;
721 }
722 SRpnt->upper_private_data = srp;
723 srp->data.k_use_sg = 0;
724 srp->data.sglist_len = 0;
725 srp->data.bufflen = 0;
726 srp->data.buffer = NULL;
727 hp->duration = jiffies; /* unit jiffies now, millisecs after done */
728/* Now send everything of to mid-level. The next time we hear about this
729 packet is when sg_cmd_done() is called (i.e. a callback). */
730 scsi_do_req(SRpnt, (void *) cmnd,
731 (void *) SRpnt->sr_buffer, hp->dxfer_len,
732 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
733 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
734 return 0;
735}
736
737static int
738sg_srp_done(Sg_request *srp, Sg_fd *sfp)
739{
740 unsigned long iflags;
741 int done;
742
743 read_lock_irqsave(&sfp->rq_list_lock, iflags);
744 done = srp->done;
745 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
746 return done;
747}
748
749static int
750sg_ioctl(struct inode *inode, struct file *filp,
751 unsigned int cmd_in, unsigned long arg)
752{
753 void __user *p = (void __user *)arg;
754 int __user *ip = p;
755 int result, val, read_only;
756 Sg_device *sdp;
757 Sg_fd *sfp;
758 Sg_request *srp;
759 unsigned long iflags;
760
761 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
762 return -ENXIO;
763 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
764 sdp->disk->disk_name, (int) cmd_in));
765 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
766
767 switch (cmd_in) {
768 case SG_IO:
769 {
770 int blocking = 1; /* ignore O_NONBLOCK flag */
771
772 if (sdp->detached)
773 return -ENODEV;
774 if (!scsi_block_when_processing_errors(sdp->device))
775 return -ENXIO;
776 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
777 return -EFAULT;
778 result =
779 sg_new_write(sfp, p, SZ_SG_IO_HDR,
780 blocking, read_only, &srp);
781 if (result < 0)
782 return result;
783 srp->sg_io_owned = 1;
784 while (1) {
785 result = 0; /* following macro to beat race condition */
786 __wait_event_interruptible(sfp->read_wait,
787 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
788 result);
789 if (sdp->detached)
790 return -ENODEV;
791 if (sfp->closed)
792 return 0; /* request packet dropped already */
793 if (0 == result)
794 break;
795 srp->orphan = 1;
796 return result; /* -ERESTARTSYS because signal hit process */
797 }
798 write_lock_irqsave(&sfp->rq_list_lock, iflags);
799 srp->done = 2;
800 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
801 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
802 return (result < 0) ? result : 0;
803 }
804 case SG_SET_TIMEOUT:
805 result = get_user(val, ip);
806 if (result)
807 return result;
808 if (val < 0)
809 return -EIO;
810 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
811 val = MULDIV (INT_MAX, USER_HZ, HZ);
812 sfp->timeout_user = val;
813 sfp->timeout = MULDIV (val, HZ, USER_HZ);
814
815 return 0;
816 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
817 /* strange ..., for backward compatibility */
818 return sfp->timeout_user;
819 case SG_SET_FORCE_LOW_DMA:
820 result = get_user(val, ip);
821 if (result)
822 return result;
823 if (val) {
824 sfp->low_dma = 1;
825 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
826 val = (int) sfp->reserve.bufflen;
827 sg_remove_scat(&sfp->reserve);
828 sg_build_reserve(sfp, val);
829 }
830 } else {
831 if (sdp->detached)
832 return -ENODEV;
833 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
834 }
835 return 0;
836 case SG_GET_LOW_DMA:
837 return put_user((int) sfp->low_dma, ip);
838 case SG_GET_SCSI_ID:
839 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
840 return -EFAULT;
841 else {
842 sg_scsi_id_t __user *sg_idp = p;
843
844 if (sdp->detached)
845 return -ENODEV;
846 __put_user((int) sdp->device->host->host_no,
847 &sg_idp->host_no);
848 __put_user((int) sdp->device->channel,
849 &sg_idp->channel);
850 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
851 __put_user((int) sdp->device->lun, &sg_idp->lun);
852 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
853 __put_user((short) sdp->device->host->cmd_per_lun,
854 &sg_idp->h_cmd_per_lun);
855 __put_user((short) sdp->device->queue_depth,
856 &sg_idp->d_queue_depth);
857 __put_user(0, &sg_idp->unused[0]);
858 __put_user(0, &sg_idp->unused[1]);
859 return 0;
860 }
861 case SG_SET_FORCE_PACK_ID:
862 result = get_user(val, ip);
863 if (result)
864 return result;
865 sfp->force_packid = val ? 1 : 0;
866 return 0;
867 case SG_GET_PACK_ID:
868 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
869 return -EFAULT;
870 read_lock_irqsave(&sfp->rq_list_lock, iflags);
871 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
872 if ((1 == srp->done) && (!srp->sg_io_owned)) {
873 read_unlock_irqrestore(&sfp->rq_list_lock,
874 iflags);
875 __put_user(srp->header.pack_id, ip);
876 return 0;
877 }
878 }
879 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
880 __put_user(-1, ip);
881 return 0;
882 case SG_GET_NUM_WAITING:
883 read_lock_irqsave(&sfp->rq_list_lock, iflags);
884 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
885 if ((1 == srp->done) && (!srp->sg_io_owned))
886 ++val;
887 }
888 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
889 return put_user(val, ip);
890 case SG_GET_SG_TABLESIZE:
891 return put_user(sdp->sg_tablesize, ip);
892 case SG_SET_RESERVED_SIZE:
893 result = get_user(val, ip);
894 if (result)
895 return result;
896 if (val < 0)
897 return -EINVAL;
898 if (val != sfp->reserve.bufflen) {
899 if (sg_res_in_use(sfp) || sfp->mmap_called)
900 return -EBUSY;
901 sg_remove_scat(&sfp->reserve);
902 sg_build_reserve(sfp, val);
903 }
904 return 0;
905 case SG_GET_RESERVED_SIZE:
906 val = (int) sfp->reserve.bufflen;
907 return put_user(val, ip);
908 case SG_SET_COMMAND_Q:
909 result = get_user(val, ip);
910 if (result)
911 return result;
912 sfp->cmd_q = val ? 1 : 0;
913 return 0;
914 case SG_GET_COMMAND_Q:
915 return put_user((int) sfp->cmd_q, ip);
916 case SG_SET_KEEP_ORPHAN:
917 result = get_user(val, ip);
918 if (result)
919 return result;
920 sfp->keep_orphan = val;
921 return 0;
922 case SG_GET_KEEP_ORPHAN:
923 return put_user((int) sfp->keep_orphan, ip);
924 case SG_NEXT_CMD_LEN:
925 result = get_user(val, ip);
926 if (result)
927 return result;
928 sfp->next_cmd_len = (val > 0) ? val : 0;
929 return 0;
930 case SG_GET_VERSION_NUM:
931 return put_user(sg_version_num, ip);
932 case SG_GET_ACCESS_COUNT:
933 /* faked - we don't have a real access count anymore */
934 val = (sdp->device ? 1 : 0);
935 return put_user(val, ip);
936 case SG_GET_REQUEST_TABLE:
937 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
938 return -EFAULT;
939 else {
940 sg_req_info_t rinfo[SG_MAX_QUEUE];
941 Sg_request *srp;
942 read_lock_irqsave(&sfp->rq_list_lock, iflags);
943 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
944 ++val, srp = srp ? srp->nextrp : srp) {
945 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
946 if (srp) {
947 rinfo[val].req_state = srp->done + 1;
948 rinfo[val].problem =
949 srp->header.masked_status &
950 srp->header.host_status &
951 srp->header.driver_status;
952 rinfo[val].duration =
953 srp->done ? srp->header.duration :
954 jiffies_to_msecs(
955 jiffies - srp->header.duration);
956 rinfo[val].orphan = srp->orphan;
957 rinfo[val].sg_io_owned = srp->sg_io_owned;
958 rinfo[val].pack_id = srp->header.pack_id;
959 rinfo[val].usr_ptr = srp->header.usr_ptr;
960 }
961 }
962 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
963 return (__copy_to_user(p, rinfo,
964 SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0);
965 }
966 case SG_EMULATED_HOST:
967 if (sdp->detached)
968 return -ENODEV;
969 return put_user(sdp->device->host->hostt->emulated, ip);
970 case SG_SCSI_RESET:
971 if (sdp->detached)
972 return -ENODEV;
973 if (filp->f_flags & O_NONBLOCK) {
974 if (test_bit(SHOST_RECOVERY,
975 &sdp->device->host->shost_state))
976 return -EBUSY;
977 } else if (!scsi_block_when_processing_errors(sdp->device))
978 return -EBUSY;
979 result = get_user(val, ip);
980 if (result)
981 return result;
982 if (SG_SCSI_RESET_NOTHING == val)
983 return 0;
984 switch (val) {
985 case SG_SCSI_RESET_DEVICE:
986 val = SCSI_TRY_RESET_DEVICE;
987 break;
988 case SG_SCSI_RESET_BUS:
989 val = SCSI_TRY_RESET_BUS;
990 break;
991 case SG_SCSI_RESET_HOST:
992 val = SCSI_TRY_RESET_HOST;
993 break;
994 default:
995 return -EINVAL;
996 }
997 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
998 return -EACCES;
999 return (scsi_reset_provider(sdp->device, val) ==
1000 SUCCESS) ? 0 : -EIO;
1001 case SCSI_IOCTL_SEND_COMMAND:
1002 if (sdp->detached)
1003 return -ENODEV;
1004 if (read_only) {
1005 unsigned char opcode = WRITE_6;
1006 Scsi_Ioctl_Command __user *siocp = p;
1007
1008 if (copy_from_user(&opcode, siocp->data, 1))
1009 return -EFAULT;
1010 if (!sg_allow_access(opcode, sdp->device->type))
1011 return -EPERM;
1012 }
1013 return scsi_ioctl_send_command(sdp->device, p);
1014 case SG_SET_DEBUG:
1015 result = get_user(val, ip);
1016 if (result)
1017 return result;
1018 sdp->sgdebug = (char) val;
1019 return 0;
1020 case SCSI_IOCTL_GET_IDLUN:
1021 case SCSI_IOCTL_GET_BUS_NUMBER:
1022 case SCSI_IOCTL_PROBE_HOST:
1023 case SG_GET_TRANSFORM:
1024 if (sdp->detached)
1025 return -ENODEV;
1026 return scsi_ioctl(sdp->device, cmd_in, p);
1027 default:
1028 if (read_only)
1029 return -EPERM; /* don't know so take safe approach */
1030 return scsi_ioctl(sdp->device, cmd_in, p);
1031 }
1032}
1033
1034#ifdef CONFIG_COMPAT
1035static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1036{
1037 Sg_device *sdp;
1038 Sg_fd *sfp;
1039 struct scsi_device *sdev;
1040
1041 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1042 return -ENXIO;
1043
1044 sdev = sdp->device;
1045 if (sdev->host->hostt->compat_ioctl) {
1046 int ret;
1047
1048 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1049
1050 return ret;
1051 }
1052
1053 return -ENOIOCTLCMD;
1054}
1055#endif
1056
1057static unsigned int
1058sg_poll(struct file *filp, poll_table * wait)
1059{
1060 unsigned int res = 0;
1061 Sg_device *sdp;
1062 Sg_fd *sfp;
1063 Sg_request *srp;
1064 int count = 0;
1065 unsigned long iflags;
1066
1067 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1068 || sfp->closed)
1069 return POLLERR;
1070 poll_wait(filp, &sfp->read_wait, wait);
1071 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1072 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1073 /* if any read waiting, flag it */
1074 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1075 res = POLLIN | POLLRDNORM;
1076 ++count;
1077 }
1078 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1079
1080 if (sdp->detached)
1081 res |= POLLHUP;
1082 else if (!sfp->cmd_q) {
1083 if (0 == count)
1084 res |= POLLOUT | POLLWRNORM;
1085 } else if (count < SG_MAX_QUEUE)
1086 res |= POLLOUT | POLLWRNORM;
1087 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1088 sdp->disk->disk_name, (int) res));
1089 return res;
1090}
1091
1092static int
1093sg_fasync(int fd, struct file *filp, int mode)
1094{
1095 int retval;
1096 Sg_device *sdp;
1097 Sg_fd *sfp;
1098
1099 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1100 return -ENXIO;
1101 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1102 sdp->disk->disk_name, mode));
1103
1104 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1105 return (retval < 0) ? retval : 0;
1106}
1107
1108static inline unsigned char *
1109sg_scatg2virt(const struct scatterlist *sclp)
1110{
1111 return (sclp && sclp->page) ?
1112 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1113}
1114
1115/* When startFinish==1 increments page counts for pages other than the
1116 first of scatter gather elements obtained from __get_free_pages().
1117 When startFinish==0 decrements ... */
1118static void
1119sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1120{
1121 void *page_ptr;
1122 struct page *page;
1123 int k, m;
1124
1125 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1126 startFinish, rsv_schp->k_use_sg));
1127 /* N.B. correction _not_ applied to base page of each allocation */
1128 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1129 struct scatterlist *sclp = rsv_schp->buffer;
1130
1131 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1132 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1133 page_ptr = sg_scatg2virt(sclp) + m;
1134 page = virt_to_page(page_ptr);
1135 if (startFinish)
1136 get_page(page);
1137 else {
1138 if (page_count(page) > 0)
1139 __put_page(page);
1140 }
1141 }
1142 }
1143 } else { /* reserve buffer is just a single allocation */
1144 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1145 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1146 page = virt_to_page(page_ptr);
1147 if (startFinish)
1148 get_page(page);
1149 else {
1150 if (page_count(page) > 0)
1151 __put_page(page);
1152 }
1153 }
1154 }
1155}
1156
1157static struct page *
1158sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1159{
1160 Sg_fd *sfp;
1161 struct page *page = NOPAGE_SIGBUS;
1162 void *page_ptr = NULL;
1163 unsigned long offset;
1164 Sg_scatter_hold *rsv_schp;
1165
1166 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1167 return page;
1168 rsv_schp = &sfp->reserve;
1169 offset = addr - vma->vm_start;
1170 if (offset >= rsv_schp->bufflen)
1171 return page;
1172 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1173 offset, rsv_schp->k_use_sg));
1174 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1175 int k;
1176 unsigned long sa = vma->vm_start;
1177 unsigned long len;
1178 struct scatterlist *sclp = rsv_schp->buffer;
1179
1180 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1181 ++k, ++sclp) {
1182 len = vma->vm_end - sa;
1183 len = (len < sclp->length) ? len : sclp->length;
1184 if (offset < len) {
1185 page_ptr = sg_scatg2virt(sclp) + offset;
1186 page = virt_to_page(page_ptr);
1187 get_page(page); /* increment page count */
1188 break;
1189 }
1190 sa += len;
1191 offset -= len;
1192 }
1193 } else { /* reserve buffer is just a single allocation */
1194 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1195 page = virt_to_page(page_ptr);
1196 get_page(page); /* increment page count */
1197 }
1198 if (type)
1199 *type = VM_FAULT_MINOR;
1200 return page;
1201}
1202
1203static struct vm_operations_struct sg_mmap_vm_ops = {
1204 .nopage = sg_vma_nopage,
1205};
1206
1207static int
1208sg_mmap(struct file *filp, struct vm_area_struct *vma)
1209{
1210 Sg_fd *sfp;
1211 unsigned long req_sz = vma->vm_end - vma->vm_start;
1212 Sg_scatter_hold *rsv_schp;
1213
1214 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1215 return -ENXIO;
1216 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1217 (void *) vma->vm_start, (int) req_sz));
1218 if (vma->vm_pgoff)
1219 return -EINVAL; /* want no offset */
1220 rsv_schp = &sfp->reserve;
1221 if (req_sz > rsv_schp->bufflen)
1222 return -ENOMEM; /* cannot map more than reserved buffer */
1223
1224 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1225 int k;
1226 unsigned long sa = vma->vm_start;
1227 unsigned long len;
1228 struct scatterlist *sclp = rsv_schp->buffer;
1229
1230 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1231 ++k, ++sclp) {
1232 if (0 != sclp->offset)
1233 return -EFAULT; /* non page aligned memory ?? */
1234 len = vma->vm_end - sa;
1235 len = (len < sclp->length) ? len : sclp->length;
1236 sa += len;
1237 }
1238 } else { /* reserve buffer is just a single allocation */
1239 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1240 return -EFAULT; /* non page aligned memory ?? */
1241 }
1242 if (0 == sfp->mmap_called) {
1243 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1244 sfp->mmap_called = 1;
1245 }
1246 vma->vm_flags |= (VM_RESERVED | VM_IO);
1247 vma->vm_private_data = sfp;
1248 vma->vm_ops = &sg_mmap_vm_ops;
1249 return 0;
1250}
1251
1252/* This function is a "bottom half" handler that is called by the
1253 * mid level when a command is completed (or has failed). */
1254static void
1255sg_cmd_done(Scsi_Cmnd * SCpnt)
1256{
1257 Scsi_Request *SRpnt = NULL;
1258 Sg_device *sdp = NULL;
1259 Sg_fd *sfp;
1260 Sg_request *srp = NULL;
1261 unsigned long iflags;
1262
1263 if (SCpnt && (SRpnt = SCpnt->sc_request))
1264 srp = (Sg_request *) SRpnt->upper_private_data;
1265 if (NULL == srp) {
1266 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1267 if (SRpnt)
1268 scsi_release_request(SRpnt);
1269 return;
1270 }
1271 sfp = srp->parentfp;
1272 if (sfp)
1273 sdp = sfp->parentdp;
1274 if ((NULL == sdp) || sdp->detached) {
1275 printk(KERN_INFO "sg_cmd_done: device detached\n");
1276 scsi_release_request(SRpnt);
1277 return;
1278 }
1279
1280 /* First transfer ownership of data buffers to sg_device object. */
1281 srp->data.k_use_sg = SRpnt->sr_use_sg;
1282 srp->data.sglist_len = SRpnt->sr_sglist_len;
1283 srp->data.bufflen = SRpnt->sr_bufflen;
1284 srp->data.buffer = SRpnt->sr_buffer;
1285 /* now clear out request structure */
1286 SRpnt->sr_use_sg = 0;
1287 SRpnt->sr_sglist_len = 0;
1288 SRpnt->sr_bufflen = 0;
1289 SRpnt->sr_buffer = NULL;
1290 SRpnt->sr_underflow = 0;
1291 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1292
1293 srp->my_cmdp = NULL;
1294
1295 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1296 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1297 srp->header.resid = SCpnt->resid;
1298 /* N.B. unit of duration changes here from jiffies to millisecs */
1299 srp->header.duration =
1300 jiffies_to_msecs(jiffies - srp->header.duration);
1301 if (0 != SRpnt->sr_result) {
1302 struct scsi_sense_hdr sshdr;
1303
1304 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1305 sizeof (srp->sense_b));
1306 srp->header.status = 0xff & SRpnt->sr_result;
1307 srp->header.masked_status = status_byte(SRpnt->sr_result);
1308 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1309 srp->header.host_status = host_byte(SRpnt->sr_result);
1310 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1311 if ((sdp->sgdebug > 0) &&
1312 ((CHECK_CONDITION == srp->header.masked_status) ||
1313 (COMMAND_TERMINATED == srp->header.masked_status)))
1314 print_req_sense("sg_cmd_done", SRpnt);
1315
1316 /* Following if statement is a patch supplied by Eric Youngdale */
1317 if (driver_byte(SRpnt->sr_result) != 0
1318 && scsi_command_normalize_sense(SCpnt, &sshdr)
1319 && !scsi_sense_is_deferred(&sshdr)
1320 && sshdr.sense_key == UNIT_ATTENTION
1321 && sdp->device->removable) {
1322 /* Detected possible disc change. Set the bit - this */
1323 /* may be used if there are filesystems using this device */
1324 sdp->device->changed = 1;
1325 }
1326 }
1327 /* Rely on write phase to clean out srp status values, so no "else" */
1328
1329 scsi_release_request(SRpnt);
1330 SRpnt = NULL;
1331 if (sfp->closed) { /* whoops this fd already released, cleanup */
1332 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1333 sg_finish_rem_req(srp);
1334 srp = NULL;
1335 if (NULL == sfp->headrp) {
1336 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1337 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1338 scsi_device_put(sdp->device);
1339 }
1340 sfp = NULL;
1341 }
1342 } else if (srp && srp->orphan) {
1343 if (sfp->keep_orphan)
1344 srp->sg_io_owned = 0;
1345 else {
1346 sg_finish_rem_req(srp);
1347 srp = NULL;
1348 }
1349 }
1350 if (sfp && srp) {
1351 /* Now wake up any sg_read() that is waiting for this packet. */
1352 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1353 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1354 srp->done = 1;
1355 wake_up_interruptible(&sfp->read_wait);
1356 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1357 }
1358}
1359
1360static struct file_operations sg_fops = {
1361 .owner = THIS_MODULE,
1362 .read = sg_read,
1363 .write = sg_write,
1364 .poll = sg_poll,
1365 .ioctl = sg_ioctl,
1366#ifdef CONFIG_COMPAT
1367 .compat_ioctl = sg_compat_ioctl,
1368#endif
1369 .open = sg_open,
1370 .mmap = sg_mmap,
1371 .release = sg_release,
1372 .fasync = sg_fasync,
1373};
1374
1375static struct class_simple * sg_sysfs_class;
1376
1377static int sg_sysfs_valid = 0;
1378
1379static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1380{
1381 Sg_device *sdp;
1382 unsigned long iflags;
1383 void *old_sg_dev_arr = NULL;
1384 int k, error;
1385
1386 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
1387 if (!sdp) {
1388 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1389 return -ENOMEM;
1390 }
1391
1392 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1393 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1394 Sg_device **tmp_da;
1395 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1396 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1397
1398 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1399 if (unlikely(!tmp_da))
1400 goto expand_failed;
1401
1402 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1403 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1404 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1405 old_sg_dev_arr = sg_dev_arr;
1406 sg_dev_arr = tmp_da;
1407 sg_dev_max = tmp_dev_max;
1408 }
1409
1410 for (k = 0; k < sg_dev_max; k++)
1411 if (!sg_dev_arr[k])
1412 break;
1413 if (unlikely(k >= SG_MAX_DEVS))
1414 goto overflow;
1415
1416 memset(sdp, 0, sizeof(*sdp));
1417 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1418 sprintf(disk->disk_name, "sg%d", k);
1419 disk->first_minor = k;
1420 sdp->disk = disk;
1421 sdp->device = scsidp;
1422 init_waitqueue_head(&sdp->o_excl_wait);
1423 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1424
1425 sg_nr_dev++;
1426 sg_dev_arr[k] = sdp;
1427 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1428 error = k;
1429
1430 out:
1431 if (error < 0)
1432 kfree(sdp);
1433 kfree(old_sg_dev_arr);
1434 return error;
1435
1436 expand_failed:
1437 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1438 error = -ENOMEM;
1439 goto out;
1440
1441 overflow:
1442 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1443 printk(KERN_WARNING
1444 "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
1445 "number exceeds %d\n", scsidp->host->host_no, scsidp->channel,
1446 scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
1447 error = -ENODEV;
1448 goto out;
1449}
1450
1451static int
1452sg_add(struct class_device *cl_dev)
1453{
1454 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1455 struct gendisk *disk;
1456 Sg_device *sdp = NULL;
1457 struct cdev * cdev = NULL;
1458 int error, k;
1459
1460 disk = alloc_disk(1);
1461 if (!disk) {
1462 printk(KERN_WARNING "alloc_disk failed\n");
1463 return -ENOMEM;
1464 }
1465 disk->major = SCSI_GENERIC_MAJOR;
1466
1467 error = -ENOMEM;
1468 cdev = cdev_alloc();
1469 if (!cdev) {
1470 printk(KERN_WARNING "cdev_alloc failed\n");
1471 goto out;
1472 }
1473 cdev->owner = THIS_MODULE;
1474 cdev->ops = &sg_fops;
1475
1476 error = sg_alloc(disk, scsidp);
1477 if (error < 0) {
1478 printk(KERN_WARNING "sg_alloc failed\n");
1479 goto out;
1480 }
1481 k = error;
1482 sdp = sg_dev_arr[k];
1483
1484 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1485 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1486 "%s/generic", scsidp->devfs_name);
1487 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1488 if (error) {
1489 devfs_remove("%s/generic", scsidp->devfs_name);
1490 goto out;
1491 }
1492 sdp->cdev = cdev;
1493 if (sg_sysfs_valid) {
1494 struct class_device * sg_class_member;
1495
1496 sg_class_member = class_simple_device_add(sg_sysfs_class,
1497 MKDEV(SCSI_GENERIC_MAJOR, k),
1498 cl_dev->dev, "%s",
1499 disk->disk_name);
1500 if (IS_ERR(sg_class_member))
1501 printk(KERN_WARNING "sg_add: "
1502 "class_simple_device_add failed\n");
1503 class_set_devdata(sg_class_member, sdp);
1504 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1505 &sg_class_member->kobj, "generic");
1506 if (error)
1507 printk(KERN_ERR "sg_add: unable to make symlink "
1508 "'generic' back to sg%d\n", k);
1509 } else
1510 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1511
1512 printk(KERN_NOTICE
1513 "Attached scsi generic sg%d at scsi%d, channel"
1514 " %d, id %d, lun %d, type %d\n", k,
1515 scsidp->host->host_no, scsidp->channel, scsidp->id,
1516 scsidp->lun, scsidp->type);
1517
1518 return 0;
1519
1520out:
1521 put_disk(disk);
1522 if (cdev)
1523 cdev_del(cdev);
1524 return error;
1525}
1526
1527static void
1528sg_remove(struct class_device *cl_dev)
1529{
1530 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1531 Sg_device *sdp = NULL;
1532 unsigned long iflags;
1533 Sg_fd *sfp;
1534 Sg_fd *tsfp;
1535 Sg_request *srp;
1536 Sg_request *tsrp;
1537 int k, delay;
1538
1539 if (NULL == sg_dev_arr)
1540 return;
1541 delay = 0;
1542 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1543 for (k = 0; k < sg_dev_max; k++) {
1544 sdp = sg_dev_arr[k];
1545 if ((NULL == sdp) || (sdp->device != scsidp))
1546 continue; /* dirty but lowers nesting */
1547 if (sdp->headfp) {
1548 sdp->detached = 1;
1549 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1550 tsfp = sfp->nextfp;
1551 for (srp = sfp->headrp; srp; srp = tsrp) {
1552 tsrp = srp->nextrp;
1553 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1554 sg_finish_rem_req(srp);
1555 }
1556 if (sfp->closed) {
1557 scsi_device_put(sdp->device);
1558 __sg_remove_sfp(sdp, sfp);
1559 } else {
1560 delay = 1;
1561 wake_up_interruptible(&sfp->read_wait);
1562 kill_fasync(&sfp->async_qp, SIGPOLL,
1563 POLL_HUP);
1564 }
1565 }
1566 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1567 if (NULL == sdp->headfp) {
1568 sg_dev_arr[k] = NULL;
1569 }
1570 } else { /* nothing active, simple case */
1571 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1572 sg_dev_arr[k] = NULL;
1573 }
1574 sg_nr_dev--;
1575 break;
1576 }
1577 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1578
1579 if (sdp) {
1580 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1581 class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k));
1582 cdev_del(sdp->cdev);
1583 sdp->cdev = NULL;
1584 devfs_remove("%s/generic", scsidp->devfs_name);
1585 put_disk(sdp->disk);
1586 sdp->disk = NULL;
1587 if (NULL == sdp->headfp)
1588 kfree((char *) sdp);
1589 }
1590
1591 if (delay)
1592 msleep(10); /* dirty detach so delay device destruction */
1593}
1594
1595/* Set 'perm' (4th argument) to 0 to disable module_param's definition
1596 * of sysfs parameters (which module_param doesn't yet support).
1597 * Sysfs parameters defined explicitly below.
1598 */
1599module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
1600module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1601
1602MODULE_AUTHOR("Douglas Gilbert");
1603MODULE_DESCRIPTION("SCSI generic (sg) driver");
1604MODULE_LICENSE("GPL");
1605MODULE_VERSION(SG_VERSION_STR);
1606
1607MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1608MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1609
1610static int __init
1611init_sg(void)
1612{
1613 int rc;
1614
1615 if (def_reserved_size >= 0)
1616 sg_big_buff = def_reserved_size;
1617
1618 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1619 SG_MAX_DEVS, "sg");
1620 if (rc)
1621 return rc;
1622 sg_sysfs_class = class_simple_create(THIS_MODULE, "scsi_generic");
1623 if ( IS_ERR(sg_sysfs_class) ) {
1624 rc = PTR_ERR(sg_sysfs_class);
1625 goto err_out;
1626 }
1627 sg_sysfs_valid = 1;
1628 rc = scsi_register_interface(&sg_interface);
1629 if (0 == rc) {
1630#ifdef CONFIG_SCSI_PROC_FS
1631 sg_proc_init();
1632#endif /* CONFIG_SCSI_PROC_FS */
1633 return 0;
1634 }
1635 class_simple_destroy(sg_sysfs_class);
1636err_out:
1637 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1638 return rc;
1639}
1640
1641static void __exit
1642exit_sg(void)
1643{
1644#ifdef CONFIG_SCSI_PROC_FS
1645 sg_proc_cleanup();
1646#endif /* CONFIG_SCSI_PROC_FS */
1647 scsi_unregister_interface(&sg_interface);
1648 class_simple_destroy(sg_sysfs_class);
1649 sg_sysfs_valid = 0;
1650 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1651 SG_MAX_DEVS);
1652 if (sg_dev_arr != NULL) {
1653 kfree((char *) sg_dev_arr);
1654 sg_dev_arr = NULL;
1655 }
1656 sg_dev_max = 0;
1657}
1658
1659static int
1660sg_start_req(Sg_request * srp)
1661{
1662 int res;
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 Sg_scatter_hold *req_schp = &srp->data;
1668 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1669
1670 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1671 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1672 return 0;
1673 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1674 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1675 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1676 res = sg_build_direct(srp, sfp, dxfer_len);
1677 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1678 return res;
1679 }
1680 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1681 sg_link_reserve(sfp, srp, dxfer_len);
1682 else {
1683 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1684 if (res) {
1685 sg_remove_scat(req_schp);
1686 return res;
1687 }
1688 }
1689 return 0;
1690}
1691
1692static void
1693sg_finish_rem_req(Sg_request * srp)
1694{
1695 Sg_fd *sfp = srp->parentfp;
1696 Sg_scatter_hold *req_schp = &srp->data;
1697
1698 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1699 if (srp->res_used)
1700 sg_unlink_reserve(sfp, srp);
1701 else
1702 sg_remove_scat(req_schp);
1703 sg_remove_request(sfp, srp);
1704}
1705
1706static int
1707sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1708{
1709 int ret_sz;
1710 int elem_sz = sizeof (struct scatterlist);
1711 int sg_bufflen = tablesize * elem_sz;
1712 int mx_sc_elems = tablesize;
1713
1714 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1715 if (!schp->buffer)
1716 return -ENOMEM;
1717 else if (ret_sz != sg_bufflen) {
1718 sg_bufflen = ret_sz;
1719 mx_sc_elems = sg_bufflen / elem_sz;
1720 }
1721 schp->sglist_len = sg_bufflen;
1722 memset(schp->buffer, 0, sg_bufflen);
1723 return mx_sc_elems; /* number of scat_gath elements allocated */
1724}
1725
1726#ifdef SG_ALLOW_DIO_CODE
1727/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1728 /* hopefully this generic code will moved to a library */
1729
1730/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1731 - mapping of all pages not successful
1732 - any page is above max_pfn
1733 (i.e., either completely successful or fails)
1734*/
1735static int
1736st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1737 unsigned long uaddr, size_t count, int rw,
1738 unsigned long max_pfn)
1739{
1740 int res, i, j;
1741 unsigned int nr_pages;
1742 struct page **pages;
1743
1744 nr_pages = ((uaddr & ~PAGE_MASK) + count + ~PAGE_MASK) >> PAGE_SHIFT;
1745
1746 /* User attempted Overflow! */
1747 if ((uaddr + count) < uaddr)
1748 return -EINVAL;
1749
1750 /* Too big */
1751 if (nr_pages > max_pages)
1752 return -ENOMEM;
1753
1754 /* Hmm? */
1755 if (count == 0)
1756 return 0;
1757
1758 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1759 return -ENOMEM;
1760
1761 /* Try to fault in all of the necessary pages */
1762 down_read(&current->mm->mmap_sem);
1763 /* rw==READ means read from drive, write into memory area */
1764 res = get_user_pages(
1765 current,
1766 current->mm,
1767 uaddr,
1768 nr_pages,
1769 rw == READ,
1770 0, /* don't force */
1771 pages,
1772 NULL);
1773 up_read(&current->mm->mmap_sem);
1774
1775 /* Errors and no page mapped should return here */
1776 if (res < nr_pages)
1777 goto out_unmap;
1778
1779 for (i=0; i < nr_pages; i++) {
1780 /* FIXME: flush superflous for rw==READ,
1781 * probably wrong function for rw==WRITE
1782 */
1783 flush_dcache_page(pages[i]);
1784 if (page_to_pfn(pages[i]) > max_pfn)
1785 goto out_unlock;
1786 /* ?? Is locking needed? I don't think so */
1787 /* if (TestSetPageLocked(pages[i]))
1788 goto out_unlock; */
1789 }
1790
1791 /* Populate the scatter/gather list */
1792 sgl[0].page = pages[0];
1793 sgl[0].offset = uaddr & ~PAGE_MASK;
1794 if (nr_pages > 1) {
1795 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1796 count -= sgl[0].length;
1797 for (i=1; i < nr_pages ; i++) {
1798 sgl[i].offset = 0;
1799 sgl[i].page = pages[i];
1800 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1801 count -= PAGE_SIZE;
1802 }
1803 }
1804 else {
1805 sgl[0].length = count;
1806 }
1807
1808 kfree(pages);
1809 return nr_pages;
1810
1811 out_unlock:
1812 /* for (j=0; j < i; j++)
1813 unlock_page(pages[j]); */
1814 res = 0;
1815 out_unmap:
1816 if (res > 0)
1817 for (j=0; j < res; j++)
1818 page_cache_release(pages[j]);
1819 kfree(pages);
1820 return res;
1821}
1822
1823
1824/* And unmap them... */
1825static int
1826st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1827 int dirtied)
1828{
1829 int i;
1830
1831 for (i=0; i < nr_pages; i++) {
1832 if (dirtied && !PageReserved(sgl[i].page))
1833 SetPageDirty(sgl[i].page);
1834 /* unlock_page(sgl[i].page); */
1835 /* FIXME: cache flush missing for rw==READ
1836 * FIXME: call the correct reference counting function
1837 */
1838 page_cache_release(sgl[i].page);
1839 }
1840
1841 return 0;
1842}
1843
1844/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1845#endif
1846
1847
1848/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1849static int
1850sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1851{
1852#ifdef SG_ALLOW_DIO_CODE
1853 sg_io_hdr_t *hp = &srp->header;
1854 Sg_scatter_hold *schp = &srp->data;
1855 int sg_tablesize = sfp->parentdp->sg_tablesize;
1856 struct scatterlist *sgl;
1857 int mx_sc_elems, res;
1858 struct scsi_device *sdev = sfp->parentdp->device;
1859
1860 if (((unsigned long)hp->dxferp &
1861 queue_dma_alignment(sdev->request_queue)) != 0)
1862 return 1;
1863 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1864 if (mx_sc_elems <= 0) {
1865 return 1;
1866 }
1867 sgl = (struct scatterlist *)schp->buffer;
1868 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1869 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1870 if (res <= 0)
1871 return 1;
1872 schp->k_use_sg = res;
1873 schp->dio_in_use = 1;
1874 hp->info |= SG_INFO_DIRECT_IO;
1875 return 0;
1876#else
1877 return 1;
1878#endif
1879}
1880
1881static int
1882sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1883{
1884 int ret_sz;
1885 int blk_size = buff_size;
1886 unsigned char *p = NULL;
1887
1888 if ((blk_size < 0) || (!sfp))
1889 return -EFAULT;
1890 if (0 == blk_size)
1891 ++blk_size; /* don't know why */
1892/* round request up to next highest SG_SECTOR_SZ byte boundary */
1893 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1894 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1895 buff_size, blk_size));
1896 if (blk_size <= SG_SCATTER_SZ) {
1897 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1898 if (!p)
1899 return -ENOMEM;
1900 if (blk_size == ret_sz) { /* got it on the first attempt */
1901 schp->k_use_sg = 0;
1902 schp->buffer = p;
1903 schp->bufflen = blk_size;
1904 schp->b_malloc_len = blk_size;
1905 return 0;
1906 }
1907 } else {
1908 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1909 if (!p)
1910 return -ENOMEM;
1911 }
1912/* Want some local declarations, so start new block ... */
1913 { /* lets try and build a scatter gather list */
1914 struct scatterlist *sclp;
1915 int k, rem_sz, num;
1916 int mx_sc_elems;
1917 int sg_tablesize = sfp->parentdp->sg_tablesize;
1918 int first = 1;
1919
1920 /* N.B. ret_sz carried into this block ... */
1921 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1922 if (mx_sc_elems < 0)
1923 return mx_sc_elems; /* most likely -ENOMEM */
1924
1925 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1926 (rem_sz > 0) && (k < mx_sc_elems);
1927 ++k, rem_sz -= ret_sz, ++sclp) {
1928 if (first)
1929 first = 0;
1930 else {
1931 num =
1932 (rem_sz >
1933 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1934 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1935 if (!p)
1936 break;
1937 }
1938 sclp->page = virt_to_page(p);
1939 sclp->offset = offset_in_page(p);
1940 sclp->length = ret_sz;
1941
1942 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1943 k, sg_scatg2virt(sclp), ret_sz));
1944 } /* end of for loop */
1945 schp->k_use_sg = k;
1946 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1947 schp->bufflen = blk_size;
1948 if (rem_sz > 0) /* must have failed */
1949 return -ENOMEM;
1950 }
1951 return 0;
1952}
1953
1954static int
1955sg_write_xfer(Sg_request * srp)
1956{
1957 sg_io_hdr_t *hp = &srp->header;
1958 Sg_scatter_hold *schp = &srp->data;
1959 int num_xfer = 0;
1960 int j, k, onum, usglen, ksglen, res;
1961 int iovec_count = (int) hp->iovec_count;
1962 int dxfer_dir = hp->dxfer_direction;
1963 unsigned char *p;
1964 unsigned char __user *up;
1965 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1966
1967 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1968 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1969 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1970 if (schp->bufflen < num_xfer)
1971 num_xfer = schp->bufflen;
1972 }
1973 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1974 (new_interface
1975 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1976 return 0;
1977
1978 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1979 num_xfer, iovec_count, schp->k_use_sg));
1980 if (iovec_count) {
1981 onum = iovec_count;
1982 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1983 return -EFAULT;
1984 } else
1985 onum = 1;
1986
1987 if (0 == schp->k_use_sg) { /* kernel has single buffer */
1988 for (j = 0, p = schp->buffer; j < onum; ++j) {
1989 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1990 if (res)
1991 return res;
1992 usglen = (num_xfer > usglen) ? usglen : num_xfer;
1993 if (__copy_from_user(p, up, usglen))
1994 return -EFAULT;
1995 p += usglen;
1996 num_xfer -= usglen;
1997 if (num_xfer <= 0)
1998 return 0;
1999 }
2000 } else { /* kernel using scatter gather list */
2001 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2002
2003 ksglen = (int) sclp->length;
2004 p = sg_scatg2virt(sclp);
2005 for (j = 0, k = 0; j < onum; ++j) {
2006 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2007 if (res)
2008 return res;
2009
2010 for (; p; ++sclp, ksglen = (int) sclp->length,
2011 p = sg_scatg2virt(sclp)) {
2012 if (usglen <= 0)
2013 break;
2014 if (ksglen > usglen) {
2015 if (usglen >= num_xfer) {
2016 if (__copy_from_user
2017 (p, up, num_xfer))
2018 return -EFAULT;
2019 return 0;
2020 }
2021 if (__copy_from_user(p, up, usglen))
2022 return -EFAULT;
2023 p += usglen;
2024 ksglen -= usglen;
2025 break;
2026 } else {
2027 if (ksglen >= num_xfer) {
2028 if (__copy_from_user
2029 (p, up, num_xfer))
2030 return -EFAULT;
2031 return 0;
2032 }
2033 if (__copy_from_user(p, up, ksglen))
2034 return -EFAULT;
2035 up += ksglen;
2036 usglen -= ksglen;
2037 }
2038 ++k;
2039 if (k >= schp->k_use_sg)
2040 return 0;
2041 }
2042 }
2043 }
2044 return 0;
2045}
2046
2047static int
2048sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
2049 int wr_xf, int *countp, unsigned char __user **up)
2050{
2051 int num_xfer = (int) hp->dxfer_len;
2052 unsigned char __user *p = hp->dxferp;
2053 int count;
2054
2055 if (0 == sg_num) {
2056 if (wr_xf && ('\0' == hp->interface_id))
2057 count = (int) hp->flags; /* holds "old" input_size */
2058 else
2059 count = num_xfer;
2060 } else {
2061 sg_iovec_t iovec;
2062 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2063 return -EFAULT;
2064 p = iovec.iov_base;
2065 count = (int) iovec.iov_len;
2066 }
2067 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
2068 return -EFAULT;
2069 if (up)
2070 *up = p;
2071 if (countp)
2072 *countp = count;
2073 return 0;
2074}
2075
2076static void
2077sg_remove_scat(Sg_scatter_hold * schp)
2078{
2079 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2080 if (schp->buffer && (schp->sglist_len > 0)) {
2081 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2082
2083 if (schp->dio_in_use) {
2084#ifdef SG_ALLOW_DIO_CODE
2085 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2086#endif
2087 } else {
2088 int k;
2089
2090 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2091 ++k, ++sclp) {
2092 SCSI_LOG_TIMEOUT(5, printk(
2093 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2094 k, sg_scatg2virt(sclp), sclp->length));
2095 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2096 sclp->page = NULL;
2097 sclp->offset = 0;
2098 sclp->length = 0;
2099 }
2100 }
2101 sg_page_free(schp->buffer, schp->sglist_len);
2102 } else if (schp->buffer)
2103 sg_page_free(schp->buffer, schp->b_malloc_len);
2104 memset(schp, 0, sizeof (*schp));
2105}
2106
2107static int
2108sg_read_xfer(Sg_request * srp)
2109{
2110 sg_io_hdr_t *hp = &srp->header;
2111 Sg_scatter_hold *schp = &srp->data;
2112 int num_xfer = 0;
2113 int j, k, onum, usglen, ksglen, res;
2114 int iovec_count = (int) hp->iovec_count;
2115 int dxfer_dir = hp->dxfer_direction;
2116 unsigned char *p;
2117 unsigned char __user *up;
2118 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2119
2120 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2121 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2122 num_xfer = hp->dxfer_len;
2123 if (schp->bufflen < num_xfer)
2124 num_xfer = schp->bufflen;
2125 }
2126 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2127 (new_interface
2128 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2129 return 0;
2130
2131 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2132 num_xfer, iovec_count, schp->k_use_sg));
2133 if (iovec_count) {
2134 onum = iovec_count;
2135 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2136 return -EFAULT;
2137 } else
2138 onum = 1;
2139
2140 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2141 for (j = 0, p = schp->buffer; j < onum; ++j) {
2142 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2143 if (res)
2144 return res;
2145 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2146 if (__copy_to_user(up, p, usglen))
2147 return -EFAULT;
2148 p += usglen;
2149 num_xfer -= usglen;
2150 if (num_xfer <= 0)
2151 return 0;
2152 }
2153 } else { /* kernel using scatter gather list */
2154 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2155
2156 ksglen = (int) sclp->length;
2157 p = sg_scatg2virt(sclp);
2158 for (j = 0, k = 0; j < onum; ++j) {
2159 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2160 if (res)
2161 return res;
2162
2163 for (; p; ++sclp, ksglen = (int) sclp->length,
2164 p = sg_scatg2virt(sclp)) {
2165 if (usglen <= 0)
2166 break;
2167 if (ksglen > usglen) {
2168 if (usglen >= num_xfer) {
2169 if (__copy_to_user
2170 (up, p, num_xfer))
2171 return -EFAULT;
2172 return 0;
2173 }
2174 if (__copy_to_user(up, p, usglen))
2175 return -EFAULT;
2176 p += usglen;
2177 ksglen -= usglen;
2178 break;
2179 } else {
2180 if (ksglen >= num_xfer) {
2181 if (__copy_to_user
2182 (up, p, num_xfer))
2183 return -EFAULT;
2184 return 0;
2185 }
2186 if (__copy_to_user(up, p, ksglen))
2187 return -EFAULT;
2188 up += ksglen;
2189 usglen -= ksglen;
2190 }
2191 ++k;
2192 if (k >= schp->k_use_sg)
2193 return 0;
2194 }
2195 }
2196 }
2197 return 0;
2198}
2199
2200static int
2201sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2202{
2203 Sg_scatter_hold *schp = &srp->data;
2204
2205 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2206 num_read_xfer));
2207 if ((!outp) || (num_read_xfer <= 0))
2208 return 0;
2209 if (schp->k_use_sg > 0) {
2210 int k, num;
2211 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2212
2213 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2214 ++k, ++sclp) {
2215 num = (int) sclp->length;
2216 if (num > num_read_xfer) {
2217 if (__copy_to_user
2218 (outp, sg_scatg2virt(sclp), num_read_xfer))
2219 return -EFAULT;
2220 break;
2221 } else {
2222 if (__copy_to_user
2223 (outp, sg_scatg2virt(sclp), num))
2224 return -EFAULT;
2225 num_read_xfer -= num;
2226 if (num_read_xfer <= 0)
2227 break;
2228 outp += num;
2229 }
2230 }
2231 } else {
2232 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2233 return -EFAULT;
2234 }
2235 return 0;
2236}
2237
2238static void
2239sg_build_reserve(Sg_fd * sfp, int req_size)
2240{
2241 Sg_scatter_hold *schp = &sfp->reserve;
2242
2243 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2244 do {
2245 if (req_size < PAGE_SIZE)
2246 req_size = PAGE_SIZE;
2247 if (0 == sg_build_indirect(schp, sfp, req_size))
2248 return;
2249 else
2250 sg_remove_scat(schp);
2251 req_size >>= 1; /* divide by 2 */
2252 } while (req_size > (PAGE_SIZE / 2));
2253}
2254
2255static void
2256sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2257{
2258 Sg_scatter_hold *req_schp = &srp->data;
2259 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2260
2261 srp->res_used = 1;
2262 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2263 size = (size + 1) & (~1); /* round to even for aha1542 */
2264 if (rsv_schp->k_use_sg > 0) {
2265 int k, num;
2266 int rem = size;
2267 struct scatterlist *sclp =
2268 (struct scatterlist *) rsv_schp->buffer;
2269
2270 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2271 num = (int) sclp->length;
2272 if (rem <= num) {
2273 if (0 == k) {
2274 req_schp->k_use_sg = 0;
2275 req_schp->buffer = sg_scatg2virt(sclp);
2276 } else {
2277 sfp->save_scat_len = num;
2278 sclp->length = (unsigned) rem;
2279 req_schp->k_use_sg = k + 1;
2280 req_schp->sglist_len =
2281 rsv_schp->sglist_len;
2282 req_schp->buffer = rsv_schp->buffer;
2283 }
2284 req_schp->bufflen = size;
2285 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2286 break;
2287 } else
2288 rem -= num;
2289 }
2290 if (k >= rsv_schp->k_use_sg)
2291 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2292 } else {
2293 req_schp->k_use_sg = 0;
2294 req_schp->bufflen = size;
2295 req_schp->buffer = rsv_schp->buffer;
2296 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2297 }
2298}
2299
2300static void
2301sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2302{
2303 Sg_scatter_hold *req_schp = &srp->data;
2304 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2305
2306 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2307 (int) req_schp->k_use_sg));
2308 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2309 struct scatterlist *sclp =
2310 (struct scatterlist *) rsv_schp->buffer;
2311
2312 if (sfp->save_scat_len > 0)
2313 (sclp + (req_schp->k_use_sg - 1))->length =
2314 (unsigned) sfp->save_scat_len;
2315 else
2316 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2317 }
2318 req_schp->k_use_sg = 0;
2319 req_schp->bufflen = 0;
2320 req_schp->buffer = NULL;
2321 req_schp->sglist_len = 0;
2322 sfp->save_scat_len = 0;
2323 srp->res_used = 0;
2324}
2325
2326static Sg_request *
2327sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2328{
2329 Sg_request *resp;
2330 unsigned long iflags;
2331
2332 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2333 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2334 /* look for requests that are ready + not SG_IO owned */
2335 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2336 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2337 resp->done = 2; /* guard against other readers */
2338 break;
2339 }
2340 }
2341 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2342 return resp;
2343}
2344
2345#ifdef CONFIG_SCSI_PROC_FS
2346static Sg_request *
2347sg_get_nth_request(Sg_fd * sfp, int nth)
2348{
2349 Sg_request *resp;
2350 unsigned long iflags;
2351 int k;
2352
2353 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2354 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2355 ++k, resp = resp->nextrp) ;
2356 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2357 return resp;
2358}
2359#endif
2360
2361/* always adds to end of list */
2362static Sg_request *
2363sg_add_request(Sg_fd * sfp)
2364{
2365 int k;
2366 unsigned long iflags;
2367 Sg_request *resp;
2368 Sg_request *rp = sfp->req_arr;
2369
2370 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2371 resp = sfp->headrp;
2372 if (!resp) {
2373 memset(rp, 0, sizeof (Sg_request));
2374 rp->parentfp = sfp;
2375 resp = rp;
2376 sfp->headrp = resp;
2377 } else {
2378 if (0 == sfp->cmd_q)
2379 resp = NULL; /* command queuing disallowed */
2380 else {
2381 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2382 if (!rp->parentfp)
2383 break;
2384 }
2385 if (k < SG_MAX_QUEUE) {
2386 memset(rp, 0, sizeof (Sg_request));
2387 rp->parentfp = sfp;
2388 while (resp->nextrp)
2389 resp = resp->nextrp;
2390 resp->nextrp = rp;
2391 resp = rp;
2392 } else
2393 resp = NULL;
2394 }
2395 }
2396 if (resp) {
2397 resp->nextrp = NULL;
2398 resp->header.duration = jiffies;
2399 resp->my_cmdp = NULL;
2400 }
2401 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2402 return resp;
2403}
2404
2405/* Return of 1 for found; 0 for not found */
2406static int
2407sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2408{
2409 Sg_request *prev_rp;
2410 Sg_request *rp;
2411 unsigned long iflags;
2412 int res = 0;
2413
2414 if ((!sfp) || (!srp) || (!sfp->headrp))
2415 return res;
2416 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2417 prev_rp = sfp->headrp;
2418 if (srp == prev_rp) {
2419 sfp->headrp = prev_rp->nextrp;
2420 prev_rp->parentfp = NULL;
2421 res = 1;
2422 } else {
2423 while ((rp = prev_rp->nextrp)) {
2424 if (srp == rp) {
2425 prev_rp->nextrp = rp->nextrp;
2426 rp->parentfp = NULL;
2427 res = 1;
2428 break;
2429 }
2430 prev_rp = rp;
2431 }
2432 }
2433 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2434 return res;
2435}
2436
2437#ifdef CONFIG_SCSI_PROC_FS
2438static Sg_fd *
2439sg_get_nth_sfp(Sg_device * sdp, int nth)
2440{
2441 Sg_fd *resp;
2442 unsigned long iflags;
2443 int k;
2444
2445 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2446 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2447 ++k, resp = resp->nextfp) ;
2448 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2449 return resp;
2450}
2451#endif
2452
2453static Sg_fd *
2454sg_add_sfp(Sg_device * sdp, int dev)
2455{
2456 Sg_fd *sfp;
2457 unsigned long iflags;
2458
2459 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL);
2460 if (!sfp)
2461 return NULL;
2462 memset(sfp, 0, sizeof (Sg_fd));
2463 init_waitqueue_head(&sfp->read_wait);
2464 rwlock_init(&sfp->rq_list_lock);
2465
2466 sfp->timeout = SG_DEFAULT_TIMEOUT;
2467 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2468 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2469 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2470 sdp->device->host->unchecked_isa_dma : 1;
2471 sfp->cmd_q = SG_DEF_COMMAND_Q;
2472 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2473 sfp->parentdp = sdp;
2474 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2475 if (!sdp->headfp)
2476 sdp->headfp = sfp;
2477 else { /* add to tail of existing list */
2478 Sg_fd *pfp = sdp->headfp;
2479 while (pfp->nextfp)
2480 pfp = pfp->nextfp;
2481 pfp->nextfp = sfp;
2482 }
2483 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2484 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2485 sg_build_reserve(sfp, sg_big_buff);
2486 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2487 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2488 return sfp;
2489}
2490
2491static void
2492__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2493{
2494 Sg_fd *fp;
2495 Sg_fd *prev_fp;
2496
2497 prev_fp = sdp->headfp;
2498 if (sfp == prev_fp)
2499 sdp->headfp = prev_fp->nextfp;
2500 else {
2501 while ((fp = prev_fp->nextfp)) {
2502 if (sfp == fp) {
2503 prev_fp->nextfp = fp->nextfp;
2504 break;
2505 }
2506 prev_fp = fp;
2507 }
2508 }
2509 if (sfp->reserve.bufflen > 0) {
2510 SCSI_LOG_TIMEOUT(6,
2511 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2512 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2513 if (sfp->mmap_called)
2514 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2515 sg_remove_scat(&sfp->reserve);
2516 }
2517 sfp->parentdp = NULL;
2518 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2519 sg_page_free((char *) sfp, sizeof (Sg_fd));
2520}
2521
2522/* Returns 0 in normal case, 1 when detached and sdp object removed */
2523static int
2524sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2525{
2526 Sg_request *srp;
2527 Sg_request *tsrp;
2528 int dirty = 0;
2529 int res = 0;
2530
2531 for (srp = sfp->headrp; srp; srp = tsrp) {
2532 tsrp = srp->nextrp;
2533 if (sg_srp_done(srp, sfp))
2534 sg_finish_rem_req(srp);
2535 else
2536 ++dirty;
2537 }
2538 if (0 == dirty) {
2539 unsigned long iflags;
2540
2541 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2542 __sg_remove_sfp(sdp, sfp);
2543 if (sdp->detached && (NULL == sdp->headfp)) {
2544 int k, maxd;
2545
2546 maxd = sg_dev_max;
2547 for (k = 0; k < maxd; ++k) {
2548 if (sdp == sg_dev_arr[k])
2549 break;
2550 }
2551 if (k < maxd)
2552 sg_dev_arr[k] = NULL;
2553 kfree((char *) sdp);
2554 res = 1;
2555 }
2556 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2557 } else {
2558 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2559 /* only bump the access_count if we actually succeeded in
2560 * throwing another counter on the host module */
2561 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2562 sfp->closed = 1; /* flag dirty state on this fd */
2563 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2564 dirty));
2565 }
2566 return res;
2567}
2568
2569static int
2570sg_res_in_use(Sg_fd * sfp)
2571{
2572 const Sg_request *srp;
2573 unsigned long iflags;
2574
2575 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2576 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2577 if (srp->res_used)
2578 break;
2579 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2580 return srp ? 1 : 0;
2581}
2582
2583/* If retSzp==NULL want exact size or fail */
2584static char *
2585sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2586{
2587 char *resp = NULL;
2588 int page_mask;
2589 int order, a_size;
2590 int resSz = rqSz;
2591
2592 if (rqSz <= 0)
2593 return resp;
2594
2595 if (lowDma)
2596 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2597 else
2598 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2599
2600 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2601 order++, a_size <<= 1) ;
2602 resp = (char *) __get_free_pages(page_mask, order);
2603 while ((!resp) && order && retSzp) {
2604 --order;
2605 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2606 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2607 resSz = a_size;
2608 }
2609 if (resp) {
2610 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2611 memset(resp, 0, resSz);
2612 if (retSzp)
2613 *retSzp = resSz;
2614 }
2615 return resp;
2616}
2617
2618static void
2619sg_page_free(char *buff, int size)
2620{
2621 int order, a_size;
2622
2623 if (!buff)
2624 return;
2625 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2626 order++, a_size <<= 1) ;
2627 free_pages((unsigned long) buff, order);
2628}
2629
2630#ifndef MAINTENANCE_IN_CMD
2631#define MAINTENANCE_IN_CMD 0xa3
2632#endif
2633
2634static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2635 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2636 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2637 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2638};
2639
2640static int
2641sg_allow_access(unsigned char opcode, char dev_type)
2642{
2643 int k;
2644
2645 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2646 return 1;
2647 for (k = 0; k < sizeof (allow_ops); ++k) {
2648 if (opcode == allow_ops[k])
2649 return 1;
2650 }
2651 return 0;
2652}
2653
2654#ifdef CONFIG_SCSI_PROC_FS
2655static int
2656sg_last_dev(void)
2657{
2658 int k;
2659 unsigned long iflags;
2660
2661 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2662 for (k = sg_dev_max - 1; k >= 0; --k)
2663 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2664 break;
2665 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2666 return k + 1; /* origin 1 */
2667}
2668#endif
2669
2670static Sg_device *
2671sg_get_dev(int dev)
2672{
2673 Sg_device *sdp = NULL;
2674 unsigned long iflags;
2675
2676 if (sg_dev_arr && (dev >= 0)) {
2677 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2678 if (dev < sg_dev_max)
2679 sdp = sg_dev_arr[dev];
2680 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2681 }
2682 return sdp;
2683}
2684
2685#ifdef CONFIG_SCSI_PROC_FS
2686
2687static struct proc_dir_entry *sg_proc_sgp = NULL;
2688
2689static char sg_proc_sg_dirname[] = "scsi/sg";
2690
2691static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2692
2693static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2694static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2695 size_t count, loff_t *off);
2696static struct file_operations adio_fops = {
2697 /* .owner, .read and .llseek added in sg_proc_init() */
2698 .open = sg_proc_single_open_adio,
2699 .write = sg_proc_write_adio,
2700 .release = single_release,
2701};
2702
2703static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2704static ssize_t sg_proc_write_dressz(struct file *filp,
2705 const char __user *buffer, size_t count, loff_t *off);
2706static struct file_operations dressz_fops = {
2707 .open = sg_proc_single_open_dressz,
2708 .write = sg_proc_write_dressz,
2709 .release = single_release,
2710};
2711
2712static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2713static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2714static struct file_operations version_fops = {
2715 .open = sg_proc_single_open_version,
2716 .release = single_release,
2717};
2718
2719static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2720static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2721static struct file_operations devhdr_fops = {
2722 .open = sg_proc_single_open_devhdr,
2723 .release = single_release,
2724};
2725
2726static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2727static int sg_proc_open_dev(struct inode *inode, struct file *file);
2728static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2729static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2730static void dev_seq_stop(struct seq_file *s, void *v);
2731static struct file_operations dev_fops = {
2732 .open = sg_proc_open_dev,
2733 .release = seq_release,
2734};
2735static struct seq_operations dev_seq_ops = {
2736 .start = dev_seq_start,
2737 .next = dev_seq_next,
2738 .stop = dev_seq_stop,
2739 .show = sg_proc_seq_show_dev,
2740};
2741
2742static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2743static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2744static struct file_operations devstrs_fops = {
2745 .open = sg_proc_open_devstrs,
2746 .release = seq_release,
2747};
2748static struct seq_operations devstrs_seq_ops = {
2749 .start = dev_seq_start,
2750 .next = dev_seq_next,
2751 .stop = dev_seq_stop,
2752 .show = sg_proc_seq_show_devstrs,
2753};
2754
2755static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2756static int sg_proc_open_debug(struct inode *inode, struct file *file);
2757static struct file_operations debug_fops = {
2758 .open = sg_proc_open_debug,
2759 .release = seq_release,
2760};
2761static struct seq_operations debug_seq_ops = {
2762 .start = dev_seq_start,
2763 .next = dev_seq_next,
2764 .stop = dev_seq_stop,
2765 .show = sg_proc_seq_show_debug,
2766};
2767
2768
2769struct sg_proc_leaf {
2770 const char * name;
2771 struct file_operations * fops;
2772};
2773
2774static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2775 {"allow_dio", &adio_fops},
2776 {"debug", &debug_fops},
2777 {"def_reserved_size", &dressz_fops},
2778 {"device_hdr", &devhdr_fops},
2779 {"devices", &dev_fops},
2780 {"device_strs", &devstrs_fops},
2781 {"version", &version_fops}
2782};
2783
2784static int
2785sg_proc_init(void)
2786{
2787 int k, mask;
2788 int num_leaves =
2789 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2790 struct proc_dir_entry *pdep;
2791 struct sg_proc_leaf * leaf;
2792
2793 sg_proc_sgp = create_proc_entry(sg_proc_sg_dirname,
2794 S_IFDIR | S_IRUGO | S_IXUGO, NULL);
2795 if (!sg_proc_sgp)
2796 return 1;
2797 for (k = 0; k < num_leaves; ++k) {
2798 leaf = &sg_proc_leaf_arr[k];
2799 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2800 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2801 if (pdep) {
2802 leaf->fops->owner = THIS_MODULE,
2803 leaf->fops->read = seq_read,
2804 leaf->fops->llseek = seq_lseek,
2805 pdep->proc_fops = leaf->fops;
2806 }
2807 }
2808 return 0;
2809}
2810
2811static void
2812sg_proc_cleanup(void)
2813{
2814 int k;
2815 int num_leaves =
2816 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2817
2818 if (!sg_proc_sgp)
2819 return;
2820 for (k = 0; k < num_leaves; ++k)
2821 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2822 remove_proc_entry(sg_proc_sg_dirname, NULL);
2823}
2824
2825
2826static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2827{
2828 seq_printf(s, "%d\n", *((int *)s->private));
2829 return 0;
2830}
2831
2832static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2833{
2834 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2835}
2836
2837static ssize_t
2838sg_proc_write_adio(struct file *filp, const char __user *buffer,
2839 size_t count, loff_t *off)
2840{
2841 int num;
2842 char buff[11];
2843
2844 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2845 return -EACCES;
2846 num = (count < 10) ? count : 10;
2847 if (copy_from_user(buff, buffer, num))
2848 return -EFAULT;
2849 buff[num] = '\0';
2850 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2851 return count;
2852}
2853
2854static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2855{
2856 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2857}
2858
2859static ssize_t
2860sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2861 size_t count, loff_t *off)
2862{
2863 int num;
2864 unsigned long k = ULONG_MAX;
2865 char buff[11];
2866
2867 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2868 return -EACCES;
2869 num = (count < 10) ? count : 10;
2870 if (copy_from_user(buff, buffer, num))
2871 return -EFAULT;
2872 buff[num] = '\0';
2873 k = simple_strtoul(buff, NULL, 10);
2874 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2875 sg_big_buff = k;
2876 return count;
2877 }
2878 return -ERANGE;
2879}
2880
2881static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2882{
2883 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2884 sg_version_date);
2885 return 0;
2886}
2887
2888static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2889{
2890 return single_open(file, sg_proc_seq_show_version, NULL);
2891}
2892
2893static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2894{
2895 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2896 "online\n");
2897 return 0;
2898}
2899
2900static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2901{
2902 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2903}
2904
2905struct sg_proc_deviter {
2906 loff_t index;
2907 size_t max;
2908};
2909
2910static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2911{
2912 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2913
2914 if (! it)
2915 return NULL;
2916 if (NULL == sg_dev_arr)
2917 goto err1;
2918 it->index = *pos;
2919 it->max = sg_last_dev();
2920 if (it->index >= it->max)
2921 goto err1;
2922 return it;
2923err1:
2924 kfree(it);
2925 return NULL;
2926}
2927
2928static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2929{
2930 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2931
2932 *pos = ++it->index;
2933 return (it->index < it->max) ? it : NULL;
2934}
2935
2936static void dev_seq_stop(struct seq_file *s, void *v)
2937{
2938 kfree (v);
2939}
2940
2941static int sg_proc_open_dev(struct inode *inode, struct file *file)
2942{
2943 return seq_open(file, &dev_seq_ops);
2944}
2945
2946static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2947{
2948 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2949 Sg_device *sdp;
2950 struct scsi_device *scsidp;
2951
2952 sdp = it ? sg_get_dev(it->index) : NULL;
2953 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2954 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2955 scsidp->host->host_no, scsidp->channel,
2956 scsidp->id, scsidp->lun, (int) scsidp->type,
2957 1,
2958 (int) scsidp->queue_depth,
2959 (int) scsidp->device_busy,
2960 (int) scsi_device_online(scsidp));
2961 else
2962 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2963 return 0;
2964}
2965
2966static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2967{
2968 return seq_open(file, &devstrs_seq_ops);
2969}
2970
2971static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2972{
2973 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2974 Sg_device *sdp;
2975 struct scsi_device *scsidp;
2976
2977 sdp = it ? sg_get_dev(it->index) : NULL;
2978 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2979 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2980 scsidp->vendor, scsidp->model, scsidp->rev);
2981 else
2982 seq_printf(s, "<no active device>\n");
2983 return 0;
2984}
2985
2986static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2987{
2988 int k, m, new_interface, blen, usg;
2989 Sg_request *srp;
2990 Sg_fd *fp;
2991 const sg_io_hdr_t *hp;
2992 const char * cp;
2993
2994 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2995 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2996 "(res)sgat=%d low_dma=%d\n", k + 1,
2997 jiffies_to_msecs(fp->timeout),
2998 fp->reserve.bufflen,
2999 (int) fp->reserve.k_use_sg,
3000 (int) fp->low_dma);
3001 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
3002 (int) fp->cmd_q, (int) fp->force_packid,
3003 (int) fp->keep_orphan, (int) fp->closed);
3004 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
3005 hp = &srp->header;
3006 new_interface = (hp->interface_id == '\0') ? 0 : 1;
3007 if (srp->res_used) {
3008 if (new_interface &&
3009 (SG_FLAG_MMAP_IO & hp->flags))
3010 cp = " mmap>> ";
3011 else
3012 cp = " rb>> ";
3013 } else {
3014 if (SG_INFO_DIRECT_IO_MASK & hp->info)
3015 cp = " dio>> ";
3016 else
3017 cp = " ";
3018 }
3019 seq_printf(s, cp);
3020 blen = srp->my_cmdp ?
3021 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
3022 usg = srp->my_cmdp ?
3023 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
3024 seq_printf(s, srp->done ?
3025 ((1 == srp->done) ? "rcv:" : "fin:")
3026 : (srp->my_cmdp ? "act:" : "prior:"));
3027 seq_printf(s, " id=%d blen=%d",
3028 srp->header.pack_id, blen);
3029 if (srp->done)
3030 seq_printf(s, " dur=%d", hp->duration);
3031 else
3032 seq_printf(s, " t_o/elap=%d/%d",
3033 new_interface ? hp->timeout : jiffies_to_msecs(fp->timeout),
3034 jiffies_to_msecs(hp->duration ? (jiffies - hp->duration) : 0));
3035 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
3036 (int) srp->data.cmd_opcode);
3037 }
3038 if (0 == m)
3039 seq_printf(s, " No requests active\n");
3040 }
3041}
3042
3043static int sg_proc_open_debug(struct inode *inode, struct file *file)
3044{
3045 return seq_open(file, &debug_seq_ops);
3046}
3047
3048static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3049{
3050 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3051 Sg_device *sdp;
3052
3053 if (it && (0 == it->index)) {
3054 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3055 "(origin 1)\n", sg_dev_max, (int)it->max);
3056 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3057 }
3058 sdp = it ? sg_get_dev(it->index) : NULL;
3059 if (sdp) {
3060 struct scsi_device *scsidp = sdp->device;
3061
3062 if (NULL == scsidp) {
3063 seq_printf(s, "device %d detached ??\n",
3064 (int)it->index);
3065 return 0;
3066 }
3067
3068 if (sg_get_nth_sfp(sdp, 0)) {
3069 seq_printf(s, " >>> device=%s ",
3070 sdp->disk->disk_name);
3071 if (sdp->detached)
3072 seq_printf(s, "detached pending close ");
3073 else
3074 seq_printf
3075 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3076 scsidp->host->host_no,
3077 scsidp->channel, scsidp->id,
3078 scsidp->lun,
3079 scsidp->host->hostt->emulated);
3080 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3081 sdp->sg_tablesize, sdp->exclude);
3082 }
3083 sg_proc_debug_helper(s, sdp);
3084 }
3085 return 0;
3086}
3087
3088#endif /* CONFIG_SCSI_PROC_FS */
3089
3090module_init(init_sg);
3091module_exit(exit_sg);
3092MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 16:03:58 -0500