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[PATCH] bluetooth: kmalloc + memset -> kzalloc conversion
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / sg.c
CommitLineData
1da177e4
LT		 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
cb59e840
DG		 21static int sg_version_num = 30533; /* 2 digits for each component */
22#define SG_VERSION_STR "3.5.33"
1da177e4
LT		 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>
378f058c 52#include <linux/scatterlist.h>
1da177e4
LT		 53
54#include "scsi.h"
db9dff36 55#include <scsi/scsi_dbg.h>
1da177e4
LT		 56#include <scsi/scsi_host.h>
57#include <scsi/scsi_driver.h>
58#include <scsi/scsi_ioctl.h>
59#include <scsi/sg.h>
60
61#include "scsi_logging.h"
62
63#ifdef CONFIG_SCSI_PROC_FS
64#include <linux/proc_fs.h>
1c8e71d7 65static char *sg_version_date = "20050908";
1da177e4
LT		 66
67static int sg_proc_init(void);
68static void sg_proc_cleanup(void);
69#endif
70
71#ifndef LINUX_VERSION_CODE
72#include <linux/version.h>
73#endif /* LINUX_VERSION_CODE */
74
75#define SG_ALLOW_DIO_DEF 0
76#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
77
78#define SG_MAX_DEVS 32768
79
80/*
81 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
82 * Then when using 32 bit integers x * m may overflow during the calculation.
83 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
84 * calculates the same, but prevents the overflow when both m and d
85 * are "small" numbers (like HZ and USER_HZ).
86 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
87 * in 32 bits.
88 */
89#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
90
91#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
92
93int sg_big_buff = SG_DEF_RESERVED_SIZE;
94/* N.B. This variable is readable and writeable via
95 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
96 of this size (or less if there is not enough memory) will be reserved
97 for use by this file descriptor. [Deprecated usage: this variable is also
98 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
99 the kernel (i.e. it is not a module).] */
100static int def_reserved_size = -1; /* picks up init parameter */
101static int sg_allow_dio = SG_ALLOW_DIO_DEF;
102
103#define SG_SECTOR_SZ 512
104#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
105
106#define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
107
d8539d81
DT		 108static int sg_add(struct class_device *, struct class_interface *);
109static void sg_remove(struct class_device *, struct class_interface *);
1da177e4
LT		 110
111static Scsi_Request *dummy_cmdp; /* only used for sizeof */
112
113static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
114 file descriptor list for device */
115
116static struct class_interface sg_interface = {
117 .add = sg_add,
118 .remove = sg_remove,
119};
120
121typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
122 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
123 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
124 unsigned bufflen; /* Size of (aggregate) data buffer */
125 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
126 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
127 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
128 unsigned char cmd_opcode; /* first byte of command */
129} Sg_scatter_hold;
130
131struct sg_device; /* forward declarations */
132struct sg_fd;
133
134typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
135 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
136 struct sg_request *nextrp; /* NULL -> tail request (slist) */
137 struct sg_fd *parentfp; /* NULL -> not in use */
138 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
139 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
140 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
141 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
142 char orphan; /* 1 -> drop on sight, 0 -> normal */
143 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
144 volatile char done; /* 0->before bh, 1->before read, 2->read */
145} Sg_request;
146
147typedef struct sg_fd { /* holds the state of a file descriptor */
148 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
149 struct sg_device *parentdp; /* owning device */
150 wait_queue_head_t read_wait; /* queue read until command done */
151 rwlock_t rq_list_lock; /* protect access to list in req_arr */
152 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
153 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
154 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
155 unsigned save_scat_len; /* original length of trunc. scat. element */
156 Sg_request *headrp; /* head of request slist, NULL->empty */
157 struct fasync_struct *async_qp; /* used by asynchronous notification */
158 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
159 char low_dma; /* as in parent but possibly overridden to 1 */
160 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
161 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
162 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
163 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
164 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
165 char mmap_called; /* 0 -> mmap() never called on this fd */
166} Sg_fd;
167
168typedef struct sg_device { /* holds the state of each scsi generic device */
169 struct scsi_device *device;
170 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
171 int sg_tablesize; /* adapter's max scatter-gather table size */
172 Sg_fd *headfp; /* first open fd belonging to this device */
173 volatile char detached; /* 0->attached, 1->detached pending removal */
174 volatile char exclude; /* opened for exclusive access */
175 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
176 struct gendisk *disk;
177 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
178} Sg_device;
179
180static int sg_fasync(int fd, struct file *filp, int mode);
181static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
182static int sg_start_req(Sg_request * srp);
183static void sg_finish_rem_req(Sg_request * srp);
184static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
185static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
186 int tablesize);
187static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
188 Sg_request * srp);
189static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
190 int blocking, int read_only, Sg_request ** o_srp);
191static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
192 unsigned char *cmnd, int timeout, int blocking);
193static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
194 int wr_xf, int *countp, unsigned char __user **up);
195static int sg_write_xfer(Sg_request * srp);
196static int sg_read_xfer(Sg_request * srp);
197static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
198static void sg_remove_scat(Sg_scatter_hold * schp);
199static void sg_build_reserve(Sg_fd * sfp, int req_size);
200static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
201static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
202static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
203static void sg_page_free(char *buff, int size);
204static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
205static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
206static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
207static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
208static Sg_request *sg_add_request(Sg_fd * sfp);
209static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
210static int sg_res_in_use(Sg_fd * sfp);
211static int sg_allow_access(unsigned char opcode, char dev_type);
212static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
213static Sg_device *sg_get_dev(int dev);
214static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
215#ifdef CONFIG_SCSI_PROC_FS
216static int sg_last_dev(void);
217#endif
218
219static Sg_device **sg_dev_arr = NULL;
220static int sg_dev_max;
221static int sg_nr_dev;
222
223#define SZ_SG_HEADER sizeof(struct sg_header)
224#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
225#define SZ_SG_IOVEC sizeof(sg_iovec_t)
226#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
227
228static int
229sg_open(struct inode *inode, struct file *filp)
230{
231 int dev = iminor(inode);
232 int flags = filp->f_flags;
233 Sg_device *sdp;
234 Sg_fd *sfp;
235 int res;
236 int retval;
237
238 nonseekable_open(inode, filp);
239 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
240 sdp = sg_get_dev(dev);
241 if ((!sdp) || (!sdp->device))
242 return -ENXIO;
243 if (sdp->detached)
244 return -ENODEV;
245
246 /* This driver's module count bumped by fops_get in <linux/fs.h> */
247 /* Prevent the device driver from vanishing while we sleep */
248 retval = scsi_device_get(sdp->device);
249 if (retval)
250 return retval;
251
252 if (!((flags & O_NONBLOCK) ||
253 scsi_block_when_processing_errors(sdp->device))) {
254 retval = -ENXIO;
255 /* we are in error recovery for this device */
256 goto error_out;
257 }
258
259 if (flags & O_EXCL) {
260 if (O_RDONLY == (flags & O_ACCMODE)) {
261 retval = -EPERM; /* Can't lock it with read only access */
262 goto error_out;
263 }
264 if (sdp->headfp && (flags & O_NONBLOCK)) {
265 retval = -EBUSY;
266 goto error_out;
267 }
268 res = 0;
269 __wait_event_interruptible(sdp->o_excl_wait,
270 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
271 if (res) {
272 retval = res; /* -ERESTARTSYS because signal hit process */
273 goto error_out;
274 }
275 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
276 if (flags & O_NONBLOCK) {
277 retval = -EBUSY;
278 goto error_out;
279 }
280 res = 0;
281 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
282 res);
283 if (res) {
284 retval = res; /* -ERESTARTSYS because signal hit process */
285 goto error_out;
286 }
287 }
288 if (sdp->detached) {
289 retval = -ENODEV;
290 goto error_out;
291 }
292 if (!sdp->headfp) { /* no existing opens on this device */
293 sdp->sgdebug = 0;
294 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
295 }
296 if ((sfp = sg_add_sfp(sdp, dev)))
297 filp->private_data = sfp;
298 else {
299 if (flags & O_EXCL)
300 sdp->exclude = 0; /* undo if error */
301 retval = -ENOMEM;
302 goto error_out;
303 }
304 return 0;
305
306 error_out:
307 scsi_device_put(sdp->device);
308 return retval;
309}
310
311/* Following function was formerly called 'sg_close' */
312static int
313sg_release(struct inode *inode, struct file *filp)
314{
315 Sg_device *sdp;
316 Sg_fd *sfp;
317
318 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
319 return -ENXIO;
320 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
321 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
322 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
323 if (!sdp->detached) {
324 scsi_device_put(sdp->device);
325 }
326 sdp->exclude = 0;
327 wake_up_interruptible(&sdp->o_excl_wait);
328 }
329 return 0;
330}
331
332static ssize_t
333sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
334{
1da177e4
LT		 335 Sg_device *sdp;
336 Sg_fd *sfp;
337 Sg_request *srp;
338 int req_pack_id = -1;
1da177e4 339 sg_io_hdr_t *hp;
cb59e840
DG		 340 struct sg_header *old_hdr = NULL;
341 int retval = 0;
1da177e4
LT		 342
343 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
344 return -ENXIO;
345 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
346 sdp->disk->disk_name, (int) count));
347 if (!access_ok(VERIFY_WRITE, buf, count))
348 return -EFAULT;
349 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 350 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
351 if (!old_hdr)
352 return -ENOMEM;
353 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
354 retval = -EFAULT;
355 goto free_old_hdr;
356 }
357 if (old_hdr->reply_len < 0) {
1da177e4 358 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 359 sg_io_hdr_t *new_hdr;
360 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
361 if (!new_hdr) {
362 retval = -ENOMEM;
363 goto free_old_hdr;
364 }
365 retval =__copy_from_user
366 (new_hdr, buf, SZ_SG_IO_HDR);
367 req_pack_id = new_hdr->pack_id;
368 kfree(new_hdr);
369 if (retval) {
370 retval = -EFAULT;
371 goto free_old_hdr;
372 }
1da177e4
LT		 373 }
374 } else
cb59e840 375 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 376 }
377 srp = sg_get_rq_mark(sfp, req_pack_id);
378 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 379 if (sdp->detached) {
380 retval = -ENODEV;
381 goto free_old_hdr;
382 }
383 if (filp->f_flags & O_NONBLOCK) {
384 retval = -EAGAIN;
385 goto free_old_hdr;
386 }
1da177e4 387 while (1) {
cb59e840 388 retval = 0; /* following macro beats race condition */
1da177e4 389 __wait_event_interruptible(sfp->read_wait,
cb59e840
DG		 390 (sdp->detached ||
391 (srp = sg_get_rq_mark(sfp, req_pack_id))),
392 retval);
393 if (sdp->detached) {
394 retval = -ENODEV;
395 goto free_old_hdr;
396 }
397 if (0 == retval)
1da177e4 398 break;
cb59e840
DG		 399
400 /* -ERESTARTSYS as signal hit process */
401 goto free_old_hdr;
1da177e4
LT		 402 }
403 }
cb59e840
DG		 404 if (srp->header.interface_id != '\0') {
405 retval = sg_new_read(sfp, buf, count, srp);
406 goto free_old_hdr;
407 }
1da177e4
LT		 408
409 hp = &srp->header;
cb59e840
DG		 410 if (old_hdr == NULL) {
411 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
412 if (! old_hdr) {
413 retval = -ENOMEM;
414 goto free_old_hdr;
415 }
416 }
417 memset(old_hdr, 0, SZ_SG_HEADER);
418 old_hdr->reply_len = (int) hp->timeout;
419 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
420 old_hdr->pack_id = hp->pack_id;
421 old_hdr->twelve_byte =
1da177e4 422 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 423 old_hdr->target_status = hp->masked_status;
424 old_hdr->host_status = hp->host_status;
425 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 426 if ((CHECK_CONDITION & hp->masked_status) ||
427 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 428 memcpy(old_hdr->sense_buffer, srp->sense_b,
429 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 430 switch (hp->host_status) {
431 /* This setup of 'result' is for backward compatibility and is best
432 ignored by the user who should use target, host + driver status */
433 case DID_OK:
434 case DID_PASSTHROUGH:
435 case DID_SOFT_ERROR:
cb59e840 436 old_hdr->result = 0;
1da177e4
LT		 437 break;
438 case DID_NO_CONNECT:
439 case DID_BUS_BUSY:
440 case DID_TIME_OUT:
cb59e840 441 old_hdr->result = EBUSY;
1da177e4
LT		 442 break;
443 case DID_BAD_TARGET:
444 case DID_ABORT:
445 case DID_PARITY:
446 case DID_RESET:
447 case DID_BAD_INTR:
cb59e840 448 old_hdr->result = EIO;
1da177e4
LT		 449 break;
450 case DID_ERROR:
cb59e840 451 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 452 hp->masked_status == GOOD) ? 0 : EIO;
453 break;
454 default:
cb59e840 455 old_hdr->result = EIO;
1da177e4
LT		 456 break;
457 }
458
459 /* Now copy the result back to the user buffer. */
460 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 461 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
462 retval = -EFAULT;
463 goto free_old_hdr;
464 }
1da177e4 465 buf += SZ_SG_HEADER;
cb59e840
DG		 466 if (count > old_hdr->reply_len)
467 count = old_hdr->reply_len;
1da177e4 468 if (count > SZ_SG_HEADER) {
cb59e840
DG		 469 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
470 retval = -EFAULT;
471 goto free_old_hdr;
472 }
1da177e4
LT		 473 }
474 } else
cb59e840 475 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 476 sg_finish_rem_req(srp);
cb59e840
DG		 477 retval = count;
478free_old_hdr:
479 if (old_hdr)
480 kfree(old_hdr);
481 return retval;
1da177e4
LT		 482}
483
484static ssize_t
485sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
486{
487 sg_io_hdr_t *hp = &srp->header;
488 int err = 0;
489 int len;
490
491 if (count < SZ_SG_IO_HDR) {
492 err = -EINVAL;
493 goto err_out;
494 }
495 hp->sb_len_wr = 0;
496 if ((hp->mx_sb_len > 0) && hp->sbp) {
497 if ((CHECK_CONDITION & hp->masked_status) ||
498 (DRIVER_SENSE & hp->driver_status)) {
499 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
500 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
501 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
502 len = (len > sb_len) ? sb_len : len;
503 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
504 err = -EFAULT;
505 goto err_out;
506 }
507 hp->sb_len_wr = len;
508 }
509 }
510 if (hp->masked_status || hp->host_status || hp->driver_status)
511 hp->info |= SG_INFO_CHECK;
512 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
513 err = -EFAULT;
514 goto err_out;
515 }
516 err = sg_read_xfer(srp);
517 err_out:
518 sg_finish_rem_req(srp);
519 return (0 == err) ? count : err;
520}
521
522static ssize_t
523sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
524{
525 int mxsize, cmd_size, k;
526 int input_size, blocking;
527 unsigned char opcode;
528 Sg_device *sdp;
529 Sg_fd *sfp;
530 Sg_request *srp;
531 struct sg_header old_hdr;
532 sg_io_hdr_t *hp;
533 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
534
535 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
536 return -ENXIO;
537 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
538 sdp->disk->disk_name, (int) count));
539 if (sdp->detached)
540 return -ENODEV;
541 if (!((filp->f_flags & O_NONBLOCK) ||
542 scsi_block_when_processing_errors(sdp->device)))
543 return -ENXIO;
544
545 if (!access_ok(VERIFY_READ, buf, count))
546 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
547 if (count < SZ_SG_HEADER)
548 return -EIO;
549 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
550 return -EFAULT;
551 blocking = !(filp->f_flags & O_NONBLOCK);
552 if (old_hdr.reply_len < 0)
553 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
554 if (count < (SZ_SG_HEADER + 6))
555 return -EIO; /* The minimum scsi command length is 6 bytes. */
556
557 if (!(srp = sg_add_request(sfp))) {
558 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
559 return -EDOM;
560 }
561 buf += SZ_SG_HEADER;
562 __get_user(opcode, buf);
563 if (sfp->next_cmd_len > 0) {
564 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
565 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
566 sfp->next_cmd_len = 0;
567 sg_remove_request(sfp, srp);
568 return -EIO;
569 }
570 cmd_size = sfp->next_cmd_len;
571 sfp->next_cmd_len = 0; /* reset so only this write() effected */
572 } else {
573 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
574 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
575 cmd_size = 12;
576 }
577 SCSI_LOG_TIMEOUT(4, printk(
578 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
579/* Determine buffer size. */
580 input_size = count - cmd_size;
581 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
582 mxsize -= SZ_SG_HEADER;
583 input_size -= SZ_SG_HEADER;
584 if (input_size < 0) {
585 sg_remove_request(sfp, srp);
586 return -EIO; /* User did not pass enough bytes for this command. */
587 }
588 hp = &srp->header;
589 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
590 hp->cmd_len = (unsigned char) cmd_size;
591 hp->iovec_count = 0;
592 hp->mx_sb_len = 0;
593 if (input_size > 0)
594 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
595 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
596 else
597 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
598 hp->dxfer_len = mxsize;
599 hp->dxferp = (char __user *)buf + cmd_size;
600 hp->sbp = NULL;
601 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
602 hp->flags = input_size; /* structure abuse ... */
603 hp->pack_id = old_hdr.pack_id;
604 hp->usr_ptr = NULL;
605 if (__copy_from_user(cmnd, buf, cmd_size))
606 return -EFAULT;
607 /*
608 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
609 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
610 * is a non-zero input_size, so emit a warning.
611 */
612 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
613 if (printk_ratelimit())
614 printk(KERN_WARNING
615 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
616 "guessing data in;\n" KERN_WARNING " "
617 "program %s not setting count and/or reply_len properly\n",
618 old_hdr.reply_len - (int)SZ_SG_HEADER,
619 input_size, (unsigned int) cmnd[0],
620 current->comm);
621 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
622 return (k < 0) ? k : count;
623}
624
625static ssize_t
626sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
627 int blocking, int read_only, Sg_request ** o_srp)
628{
629 int k;
630 Sg_request *srp;
631 sg_io_hdr_t *hp;
632 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
633 int timeout;
634 unsigned long ul_timeout;
635
636 if (count < SZ_SG_IO_HDR)
637 return -EINVAL;
638 if (!access_ok(VERIFY_READ, buf, count))
639 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
640
641 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
642 if (!(srp = sg_add_request(sfp))) {
643 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
644 return -EDOM;
645 }
646 hp = &srp->header;
647 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
648 sg_remove_request(sfp, srp);
649 return -EFAULT;
650 }
651 if (hp->interface_id != 'S') {
652 sg_remove_request(sfp, srp);
653 return -ENOSYS;
654 }
655 if (hp->flags & SG_FLAG_MMAP_IO) {
656 if (hp->dxfer_len > sfp->reserve.bufflen) {
657 sg_remove_request(sfp, srp);
658 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
659 }
660 if (hp->flags & SG_FLAG_DIRECT_IO) {
661 sg_remove_request(sfp, srp);
662 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
663 }
664 if (sg_res_in_use(sfp)) {
665 sg_remove_request(sfp, srp);
666 return -EBUSY; /* reserve buffer already being used */
667 }
668 }
669 ul_timeout = msecs_to_jiffies(srp->header.timeout);
670 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
671 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
672 sg_remove_request(sfp, srp);
673 return -EMSGSIZE;
674 }
675 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
676 sg_remove_request(sfp, srp);
677 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
678 }
679 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
680 sg_remove_request(sfp, srp);
681 return -EFAULT;
682 }
683 if (read_only &&
684 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
685 sg_remove_request(sfp, srp);
686 return -EPERM;
687 }
688 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
689 if (k < 0)
690 return k;
691 if (o_srp)
692 *o_srp = srp;
693 return count;
694}
695
696static int
697sg_common_write(Sg_fd * sfp, Sg_request * srp,
698 unsigned char *cmnd, int timeout, int blocking)
699{
700 int k;
701 Scsi_Request *SRpnt;
702 Sg_device *sdp = sfp->parentdp;
703 sg_io_hdr_t *hp = &srp->header;
704 request_queue_t *q;
705
706 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
707 hp->status = 0;
708 hp->masked_status = 0;
709 hp->msg_status = 0;
710 hp->info = 0;
711 hp->host_status = 0;
712 hp->driver_status = 0;
713 hp->resid = 0;
714 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
715 (int) cmnd[0], (int) hp->cmd_len));
716
717 if ((k = sg_start_req(srp))) {
718 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
719 sg_finish_rem_req(srp);
720 return k; /* probably out of space --> ENOMEM */
721 }
722 if ((k = sg_write_xfer(srp))) {
723 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
724 sg_finish_rem_req(srp);
725 return k;
726 }
727 if (sdp->detached) {
728 sg_finish_rem_req(srp);
729 return -ENODEV;
730 }
731 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
732 if (SRpnt == NULL) {
733 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
734 sg_finish_rem_req(srp);
735 return -ENOMEM;
736 }
737
738 srp->my_cmdp = SRpnt;
739 q = SRpnt->sr_device->request_queue;
740 SRpnt->sr_request->rq_disk = sdp->disk;
741 SRpnt->sr_sense_buffer[0] = 0;
742 SRpnt->sr_cmd_len = hp->cmd_len;
743 SRpnt->sr_use_sg = srp->data.k_use_sg;
744 SRpnt->sr_sglist_len = srp->data.sglist_len;
745 SRpnt->sr_bufflen = srp->data.bufflen;
746 SRpnt->sr_underflow = 0;
747 SRpnt->sr_buffer = srp->data.buffer;
748 switch (hp->dxfer_direction) {
749 case SG_DXFER_TO_FROM_DEV:
750 case SG_DXFER_FROM_DEV:
be7db055 751 SRpnt->sr_data_direction = DMA_FROM_DEVICE;
1da177e4
LT		 752 break;
753 case SG_DXFER_TO_DEV:
be7db055 754 SRpnt->sr_data_direction = DMA_TO_DEVICE;
1da177e4
LT		 755 break;
756 case SG_DXFER_UNKNOWN:
be7db055 757 SRpnt->sr_data_direction = DMA_BIDIRECTIONAL;
1da177e4
LT		 758 break;
759 default:
be7db055 760 SRpnt->sr_data_direction = DMA_NONE;
1da177e4
LT		 761 break;
762 }
763 SRpnt->upper_private_data = srp;
764 srp->data.k_use_sg = 0;
765 srp->data.sglist_len = 0;
766 srp->data.bufflen = 0;
767 srp->data.buffer = NULL;
cb59e840 768 hp->duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 769/* Now send everything of to mid-level. The next time we hear about this
770 packet is when sg_cmd_done() is called (i.e. a callback). */
771 scsi_do_req(SRpnt, (void *) cmnd,
772 (void *) SRpnt->sr_buffer, hp->dxfer_len,
773 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
774 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
775 return 0;
776}
777
778static int
779sg_srp_done(Sg_request *srp, Sg_fd *sfp)
780{
781 unsigned long iflags;
782 int done;
783
784 read_lock_irqsave(&sfp->rq_list_lock, iflags);
785 done = srp->done;
786 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
787 return done;
788}
789
790static int
791sg_ioctl(struct inode *inode, struct file *filp,
792 unsigned int cmd_in, unsigned long arg)
793{
794 void __user *p = (void __user *)arg;
795 int __user *ip = p;
796 int result, val, read_only;
797 Sg_device *sdp;
798 Sg_fd *sfp;
799 Sg_request *srp;
800 unsigned long iflags;
801
802 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
803 return -ENXIO;
804 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
805 sdp->disk->disk_name, (int) cmd_in));
806 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
807
808 switch (cmd_in) {
809 case SG_IO:
810 {
811 int blocking = 1; /* ignore O_NONBLOCK flag */
812
813 if (sdp->detached)
814 return -ENODEV;
815 if (!scsi_block_when_processing_errors(sdp->device))
816 return -ENXIO;
817 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
818 return -EFAULT;
819 result =
820 sg_new_write(sfp, p, SZ_SG_IO_HDR,
821 blocking, read_only, &srp);
822 if (result < 0)
823 return result;
824 srp->sg_io_owned = 1;
825 while (1) {
826 result = 0; /* following macro to beat race condition */
827 __wait_event_interruptible(sfp->read_wait,
828 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
829 result);
830 if (sdp->detached)
831 return -ENODEV;
832 if (sfp->closed)
833 return 0; /* request packet dropped already */
834 if (0 == result)
835 break;
836 srp->orphan = 1;
837 return result; /* -ERESTARTSYS because signal hit process */
838 }
839 write_lock_irqsave(&sfp->rq_list_lock, iflags);
840 srp->done = 2;
841 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
842 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
843 return (result < 0) ? result : 0;
844 }
845 case SG_SET_TIMEOUT:
846 result = get_user(val, ip);
847 if (result)
848 return result;
849 if (val < 0)
850 return -EIO;
851 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
852 val = MULDIV (INT_MAX, USER_HZ, HZ);
853 sfp->timeout_user = val;
854 sfp->timeout = MULDIV (val, HZ, USER_HZ);
855
856 return 0;
857 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
858 /* strange ..., for backward compatibility */
859 return sfp->timeout_user;
860 case SG_SET_FORCE_LOW_DMA:
861 result = get_user(val, ip);
862 if (result)
863 return result;
864 if (val) {
865 sfp->low_dma = 1;
866 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
867 val = (int) sfp->reserve.bufflen;
868 sg_remove_scat(&sfp->reserve);
869 sg_build_reserve(sfp, val);
870 }
871 } else {
872 if (sdp->detached)
873 return -ENODEV;
874 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
875 }
876 return 0;
877 case SG_GET_LOW_DMA:
878 return put_user((int) sfp->low_dma, ip);
879 case SG_GET_SCSI_ID:
880 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
881 return -EFAULT;
882 else {
883 sg_scsi_id_t __user *sg_idp = p;
884
885 if (sdp->detached)
886 return -ENODEV;
887 __put_user((int) sdp->device->host->host_no,
888 &sg_idp->host_no);
889 __put_user((int) sdp->device->channel,
890 &sg_idp->channel);
891 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
892 __put_user((int) sdp->device->lun, &sg_idp->lun);
893 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
894 __put_user((short) sdp->device->host->cmd_per_lun,
895 &sg_idp->h_cmd_per_lun);
896 __put_user((short) sdp->device->queue_depth,
897 &sg_idp->d_queue_depth);
898 __put_user(0, &sg_idp->unused[0]);
899 __put_user(0, &sg_idp->unused[1]);
900 return 0;
901 }
902 case SG_SET_FORCE_PACK_ID:
903 result = get_user(val, ip);
904 if (result)
905 return result;
906 sfp->force_packid = val ? 1 : 0;
907 return 0;
908 case SG_GET_PACK_ID:
909 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
910 return -EFAULT;
911 read_lock_irqsave(&sfp->rq_list_lock, iflags);
912 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
913 if ((1 == srp->done) && (!srp->sg_io_owned)) {
914 read_unlock_irqrestore(&sfp->rq_list_lock,
915 iflags);
916 __put_user(srp->header.pack_id, ip);
917 return 0;
918 }
919 }
920 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
921 __put_user(-1, ip);
922 return 0;
923 case SG_GET_NUM_WAITING:
924 read_lock_irqsave(&sfp->rq_list_lock, iflags);
925 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
926 if ((1 == srp->done) && (!srp->sg_io_owned))
927 ++val;
928 }
929 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
930 return put_user(val, ip);
931 case SG_GET_SG_TABLESIZE:
932 return put_user(sdp->sg_tablesize, ip);
933 case SG_SET_RESERVED_SIZE:
934 result = get_user(val, ip);
935 if (result)
936 return result;
937 if (val < 0)
938 return -EINVAL;
939 if (val != sfp->reserve.bufflen) {
940 if (sg_res_in_use(sfp) || sfp->mmap_called)
941 return -EBUSY;
942 sg_remove_scat(&sfp->reserve);
943 sg_build_reserve(sfp, val);
944 }
945 return 0;
946 case SG_GET_RESERVED_SIZE:
947 val = (int) sfp->reserve.bufflen;
948 return put_user(val, ip);
949 case SG_SET_COMMAND_Q:
950 result = get_user(val, ip);
951 if (result)
952 return result;
953 sfp->cmd_q = val ? 1 : 0;
954 return 0;
955 case SG_GET_COMMAND_Q:
956 return put_user((int) sfp->cmd_q, ip);
957 case SG_SET_KEEP_ORPHAN:
958 result = get_user(val, ip);
959 if (result)
960 return result;
961 sfp->keep_orphan = val;
962 return 0;
963 case SG_GET_KEEP_ORPHAN:
964 return put_user((int) sfp->keep_orphan, ip);
965 case SG_NEXT_CMD_LEN:
966 result = get_user(val, ip);
967 if (result)
968 return result;
969 sfp->next_cmd_len = (val > 0) ? val : 0;
970 return 0;
971 case SG_GET_VERSION_NUM:
972 return put_user(sg_version_num, ip);
973 case SG_GET_ACCESS_COUNT:
974 /* faked - we don't have a real access count anymore */
975 val = (sdp->device ? 1 : 0);
976 return put_user(val, ip);
977 case SG_GET_REQUEST_TABLE:
978 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
979 return -EFAULT;
980 else {
cb59e840
DG		 981 sg_req_info_t *rinfo;
982 unsigned int ms;
983
984 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
985 GFP_KERNEL);
986 if (!rinfo)
987 return -ENOMEM;
1da177e4
LT		 988 read_lock_irqsave(&sfp->rq_list_lock, iflags);
989 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
990 ++val, srp = srp ? srp->nextrp : srp) {
991 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
992 if (srp) {
993 rinfo[val].req_state = srp->done + 1;
994 rinfo[val].problem =
995 srp->header.masked_status &
996 srp->header.host_status &
997 srp->header.driver_status;
cb59e840
DG		 998 if (srp->done)
999 rinfo[val].duration =
1000 srp->header.duration;
1001 else {
1002 ms = jiffies_to_msecs(jiffies);
1003 rinfo[val].duration =
1004 (ms > srp->header.duration) ?
1005 (ms - srp->header.duration) : 0;
1006 }
1da177e4 1007 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 1008 rinfo[val].sg_io_owned =
1009 srp->sg_io_owned;
1010 rinfo[val].pack_id =
1011 srp->header.pack_id;
1012 rinfo[val].usr_ptr =
1013 srp->header.usr_ptr;
1da177e4
LT		 1014 }
1015 }
1016 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1017 result = __copy_to_user(p, rinfo,
1018 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1019 result = result ? -EFAULT : 0;
1020 kfree(rinfo);
1021 return result;
1da177e4
LT		 1022 }
1023 case SG_EMULATED_HOST:
1024 if (sdp->detached)
1025 return -ENODEV;
1026 return put_user(sdp->device->host->hostt->emulated, ip);
1027 case SG_SCSI_RESET:
1028 if (sdp->detached)
1029 return -ENODEV;
1030 if (filp->f_flags & O_NONBLOCK) {
939647ee 1031 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1032 return -EBUSY;
1033 } else if (!scsi_block_when_processing_errors(sdp->device))
1034 return -EBUSY;
1035 result = get_user(val, ip);
1036 if (result)
1037 return result;
1038 if (SG_SCSI_RESET_NOTHING == val)
1039 return 0;
1040 switch (val) {
1041 case SG_SCSI_RESET_DEVICE:
1042 val = SCSI_TRY_RESET_DEVICE;
1043 break;
1044 case SG_SCSI_RESET_BUS:
1045 val = SCSI_TRY_RESET_BUS;
1046 break;
1047 case SG_SCSI_RESET_HOST:
1048 val = SCSI_TRY_RESET_HOST;
1049 break;
1050 default:
1051 return -EINVAL;
1052 }
1053 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1054 return -EACCES;
1055 return (scsi_reset_provider(sdp->device, val) ==
1056 SUCCESS) ? 0 : -EIO;
1057 case SCSI_IOCTL_SEND_COMMAND:
1058 if (sdp->detached)
1059 return -ENODEV;
1060 if (read_only) {
1061 unsigned char opcode = WRITE_6;
1062 Scsi_Ioctl_Command __user *siocp = p;
1063
1064 if (copy_from_user(&opcode, siocp->data, 1))
1065 return -EFAULT;
1066 if (!sg_allow_access(opcode, sdp->device->type))
1067 return -EPERM;
1068 }
1069 return scsi_ioctl_send_command(sdp->device, p);
1070 case SG_SET_DEBUG:
1071 result = get_user(val, ip);
1072 if (result)
1073 return result;
1074 sdp->sgdebug = (char) val;
1075 return 0;
1076 case SCSI_IOCTL_GET_IDLUN:
1077 case SCSI_IOCTL_GET_BUS_NUMBER:
1078 case SCSI_IOCTL_PROBE_HOST:
1079 case SG_GET_TRANSFORM:
1080 if (sdp->detached)
1081 return -ENODEV;
1082 return scsi_ioctl(sdp->device, cmd_in, p);
1083 default:
1084 if (read_only)
1085 return -EPERM; /* don't know so take safe approach */
1086 return scsi_ioctl(sdp->device, cmd_in, p);
1087 }
1088}
1089
1090#ifdef CONFIG_COMPAT
1091static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1092{
1093 Sg_device *sdp;
1094 Sg_fd *sfp;
1095 struct scsi_device *sdev;
1096
1097 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1098 return -ENXIO;
1099
1100 sdev = sdp->device;
1101 if (sdev->host->hostt->compat_ioctl) {
1102 int ret;
1103
1104 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1105
1106 return ret;
1107 }
1108
1109 return -ENOIOCTLCMD;
1110}
1111#endif
1112
1113static unsigned int
1114sg_poll(struct file *filp, poll_table * wait)
1115{
1116 unsigned int res = 0;
1117 Sg_device *sdp;
1118 Sg_fd *sfp;
1119 Sg_request *srp;
1120 int count = 0;
1121 unsigned long iflags;
1122
1123 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1124 || sfp->closed)
1125 return POLLERR;
1126 poll_wait(filp, &sfp->read_wait, wait);
1127 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1128 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1129 /* if any read waiting, flag it */
1130 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1131 res = POLLIN | POLLRDNORM;
1132 ++count;
1133 }
1134 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1135
1136 if (sdp->detached)
1137 res |= POLLHUP;
1138 else if (!sfp->cmd_q) {
1139 if (0 == count)
1140 res |= POLLOUT | POLLWRNORM;
1141 } else if (count < SG_MAX_QUEUE)
1142 res |= POLLOUT | POLLWRNORM;
1143 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1144 sdp->disk->disk_name, (int) res));
1145 return res;
1146}
1147
1148static int
1149sg_fasync(int fd, struct file *filp, int mode)
1150{
1151 int retval;
1152 Sg_device *sdp;
1153 Sg_fd *sfp;
1154
1155 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1156 return -ENXIO;
1157 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1158 sdp->disk->disk_name, mode));
1159
1160 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1161 return (retval < 0) ? retval : 0;
1162}
1163
1164static inline unsigned char *
1165sg_scatg2virt(const struct scatterlist *sclp)
1166{
1167 return (sclp && sclp->page) ?
1168 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1169}
1170
1171/* When startFinish==1 increments page counts for pages other than the
1172 first of scatter gather elements obtained from __get_free_pages().
1173 When startFinish==0 decrements ... */
1174static void
1175sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1176{
1177 void *page_ptr;
1178 struct page *page;
1179 int k, m;
1180
1181 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1182 startFinish, rsv_schp->k_use_sg));
1183 /* N.B. correction _not_ applied to base page of each allocation */
1184 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1185 struct scatterlist *sclp = rsv_schp->buffer;
1186
1187 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1188 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1189 page_ptr = sg_scatg2virt(sclp) + m;
1190 page = virt_to_page(page_ptr);
1191 if (startFinish)
1192 get_page(page);
1193 else {
1194 if (page_count(page) > 0)
1195 __put_page(page);
1196 }
1197 }
1198 }
1199 } else { /* reserve buffer is just a single allocation */
1200 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1201 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1202 page = virt_to_page(page_ptr);
1203 if (startFinish)
1204 get_page(page);
1205 else {
1206 if (page_count(page) > 0)
1207 __put_page(page);
1208 }
1209 }
1210 }
1211}
1212
1213static struct page *
1214sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1215{
1216 Sg_fd *sfp;
1217 struct page *page = NOPAGE_SIGBUS;
1218 void *page_ptr = NULL;
1219 unsigned long offset;
1220 Sg_scatter_hold *rsv_schp;
1221
1222 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1223 return page;
1224 rsv_schp = &sfp->reserve;
1225 offset = addr - vma->vm_start;
1226 if (offset >= rsv_schp->bufflen)
1227 return page;
1228 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1229 offset, rsv_schp->k_use_sg));
1230 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1231 int k;
1232 unsigned long sa = vma->vm_start;
1233 unsigned long len;
1234 struct scatterlist *sclp = rsv_schp->buffer;
1235
1236 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1237 ++k, ++sclp) {
1238 len = vma->vm_end - sa;
1239 len = (len < sclp->length) ? len : sclp->length;
1240 if (offset < len) {
1241 page_ptr = sg_scatg2virt(sclp) + offset;
1242 page = virt_to_page(page_ptr);
1243 get_page(page); /* increment page count */
1244 break;
1245 }
1246 sa += len;
1247 offset -= len;
1248 }
1249 } else { /* reserve buffer is just a single allocation */
1250 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1251 page = virt_to_page(page_ptr);
1252 get_page(page); /* increment page count */
1253 }
1254 if (type)
1255 *type = VM_FAULT_MINOR;
1256 return page;
1257}
1258
1259static struct vm_operations_struct sg_mmap_vm_ops = {
1260 .nopage = sg_vma_nopage,
1261};
1262
1263static int
1264sg_mmap(struct file *filp, struct vm_area_struct *vma)
1265{
1266 Sg_fd *sfp;
cb59e840 1267 unsigned long req_sz;
1da177e4
LT		 1268 Sg_scatter_hold *rsv_schp;
1269
1270 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1271 return -ENXIO;
cb59e840 1272 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1273 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1274 (void *) vma->vm_start, (int) req_sz));
1275 if (vma->vm_pgoff)
1276 return -EINVAL; /* want no offset */
1277 rsv_schp = &sfp->reserve;
1278 if (req_sz > rsv_schp->bufflen)
1279 return -ENOMEM; /* cannot map more than reserved buffer */
1280
1281 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1282 int k;
1283 unsigned long sa = vma->vm_start;
1284 unsigned long len;
1285 struct scatterlist *sclp = rsv_schp->buffer;
1286
1287 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1288 ++k, ++sclp) {
1289 if (0 != sclp->offset)
1290 return -EFAULT; /* non page aligned memory ?? */
1291 len = vma->vm_end - sa;
1292 len = (len < sclp->length) ? len : sclp->length;
1293 sa += len;
1294 }
1295 } else { /* reserve buffer is just a single allocation */
1296 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1297 return -EFAULT; /* non page aligned memory ?? */
1298 }
1299 if (0 == sfp->mmap_called) {
1300 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1301 sfp->mmap_called = 1;
1302 }
1c8e71d7 1303 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1304 vma->vm_private_data = sfp;
1305 vma->vm_ops = &sg_mmap_vm_ops;
1306 return 0;
1307}
1308
1309/* This function is a "bottom half" handler that is called by the
1310 * mid level when a command is completed (or has failed). */
1311static void
1312sg_cmd_done(Scsi_Cmnd * SCpnt)
1313{
1314 Scsi_Request *SRpnt = NULL;
1315 Sg_device *sdp = NULL;
1316 Sg_fd *sfp;
1317 Sg_request *srp = NULL;
1318 unsigned long iflags;
cb59e840 1319 unsigned int ms;
1da177e4
LT		 1320
1321 if (SCpnt && (SRpnt = SCpnt->sc_request))
1322 srp = (Sg_request *) SRpnt->upper_private_data;
1323 if (NULL == srp) {
1324 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1325 if (SRpnt)
1326 scsi_release_request(SRpnt);
1327 return;
1328 }
1329 sfp = srp->parentfp;
1330 if (sfp)
1331 sdp = sfp->parentdp;
1332 if ((NULL == sdp) || sdp->detached) {
1333 printk(KERN_INFO "sg_cmd_done: device detached\n");
1334 scsi_release_request(SRpnt);
1335 return;
1336 }
1337
1338 /* First transfer ownership of data buffers to sg_device object. */
1339 srp->data.k_use_sg = SRpnt->sr_use_sg;
1340 srp->data.sglist_len = SRpnt->sr_sglist_len;
1341 srp->data.bufflen = SRpnt->sr_bufflen;
1342 srp->data.buffer = SRpnt->sr_buffer;
1343 /* now clear out request structure */
1344 SRpnt->sr_use_sg = 0;
1345 SRpnt->sr_sglist_len = 0;
1346 SRpnt->sr_bufflen = 0;
1347 SRpnt->sr_buffer = NULL;
1348 SRpnt->sr_underflow = 0;
1349 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1350
1351 srp->my_cmdp = NULL;
1352
1353 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1354 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1355 srp->header.resid = SCpnt->resid;
cb59e840
DG		 1356 ms = jiffies_to_msecs(jiffies);
1357 srp->header.duration = (ms > srp->header.duration) ?
1358 (ms - srp->header.duration) : 0;
1da177e4
LT		 1359 if (0 != SRpnt->sr_result) {
1360 struct scsi_sense_hdr sshdr;
1361
1362 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1363 sizeof (srp->sense_b));
1364 srp->header.status = 0xff & SRpnt->sr_result;
1365 srp->header.masked_status = status_byte(SRpnt->sr_result);
1366 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1367 srp->header.host_status = host_byte(SRpnt->sr_result);
1368 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1369 if ((sdp->sgdebug > 0) &&
1370 ((CHECK_CONDITION == srp->header.masked_status) ||
1371 (COMMAND_TERMINATED == srp->header.masked_status)))
db9dff36 1372 scsi_print_req_sense("sg_cmd_done", SRpnt);
1da177e4
LT		 1373
1374 /* Following if statement is a patch supplied by Eric Youngdale */
1375 if (driver_byte(SRpnt->sr_result) != 0
1376 && scsi_command_normalize_sense(SCpnt, &sshdr)
1377 && !scsi_sense_is_deferred(&sshdr)
1378 && sshdr.sense_key == UNIT_ATTENTION
1379 && sdp->device->removable) {
1380 /* Detected possible disc change. Set the bit - this */
1381 /* may be used if there are filesystems using this device */
1382 sdp->device->changed = 1;
1383 }
1384 }
1385 /* Rely on write phase to clean out srp status values, so no "else" */
1386
1387 scsi_release_request(SRpnt);
1388 SRpnt = NULL;
1389 if (sfp->closed) { /* whoops this fd already released, cleanup */
1390 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1391 sg_finish_rem_req(srp);
1392 srp = NULL;
1393 if (NULL == sfp->headrp) {
1394 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1395 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1396 scsi_device_put(sdp->device);
1397 }
1398 sfp = NULL;
1399 }
1400 } else if (srp && srp->orphan) {
1401 if (sfp->keep_orphan)
1402 srp->sg_io_owned = 0;
1403 else {
1404 sg_finish_rem_req(srp);
1405 srp = NULL;
1406 }
1407 }
1408 if (sfp && srp) {
1409 /* Now wake up any sg_read() that is waiting for this packet. */
1410 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1411 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1412 srp->done = 1;
1413 wake_up_interruptible(&sfp->read_wait);
1414 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1415 }
1416}
1417
1418static struct file_operations sg_fops = {
1419 .owner = THIS_MODULE,
1420 .read = sg_read,
1421 .write = sg_write,
1422 .poll = sg_poll,
1423 .ioctl = sg_ioctl,
1424#ifdef CONFIG_COMPAT
1425 .compat_ioctl = sg_compat_ioctl,
1426#endif
1427 .open = sg_open,
1428 .mmap = sg_mmap,
1429 .release = sg_release,
1430 .fasync = sg_fasync,
1431};
1432
d253878b 1433static struct class *sg_sysfs_class;
1da177e4
LT		 1434
1435static int sg_sysfs_valid = 0;
1436
1437static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1438{
1439 Sg_device *sdp;
1440 unsigned long iflags;
1441 void *old_sg_dev_arr = NULL;
1442 int k, error;
1443
1444 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
1445 if (!sdp) {
1446 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1447 return -ENOMEM;
1448 }
1449
1450 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1451 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1452 Sg_device **tmp_da;
1453 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1454 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1455
1456 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1457 if (unlikely(!tmp_da))
1458 goto expand_failed;
1459
1460 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1461 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1462 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1463 old_sg_dev_arr = sg_dev_arr;
1464 sg_dev_arr = tmp_da;
1465 sg_dev_max = tmp_dev_max;
1466 }
1467
1468 for (k = 0; k < sg_dev_max; k++)
1469 if (!sg_dev_arr[k])
1470 break;
1471 if (unlikely(k >= SG_MAX_DEVS))
1472 goto overflow;
1473
1474 memset(sdp, 0, sizeof(*sdp));
1475 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1476 sprintf(disk->disk_name, "sg%d", k);
1477 disk->first_minor = k;
1478 sdp->disk = disk;
1479 sdp->device = scsidp;
1480 init_waitqueue_head(&sdp->o_excl_wait);
1481 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1482
1483 sg_nr_dev++;
1484 sg_dev_arr[k] = sdp;
1485 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1486 error = k;
1487
1488 out:
1489 if (error < 0)
1490 kfree(sdp);
1491 kfree(old_sg_dev_arr);
1492 return error;
1493
1494 expand_failed:
1495 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1496 error = -ENOMEM;
1497 goto out;
1498
1499 overflow:
1500 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
9ccfc756
JB		 1501 sdev_printk(KERN_WARNING, scsidp,
1502 "Unable to attach sg device type=%d, minor "
1503 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1504 error = -ENODEV;
1505 goto out;
1506}
1507
1508static int
d8539d81 1509sg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
1da177e4
LT		 1510{
1511 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1512 struct gendisk *disk;
1513 Sg_device *sdp = NULL;
1514 struct cdev * cdev = NULL;
1515 int error, k;
1516
1517 disk = alloc_disk(1);
1518 if (!disk) {
1519 printk(KERN_WARNING "alloc_disk failed\n");
1520 return -ENOMEM;
1521 }
1522 disk->major = SCSI_GENERIC_MAJOR;
1523
1524 error = -ENOMEM;
1525 cdev = cdev_alloc();
1526 if (!cdev) {
1527 printk(KERN_WARNING "cdev_alloc failed\n");
1528 goto out;
1529 }
1530 cdev->owner = THIS_MODULE;
1531 cdev->ops = &sg_fops;
1532
1533 error = sg_alloc(disk, scsidp);
1534 if (error < 0) {
1535 printk(KERN_WARNING "sg_alloc failed\n");
1536 goto out;
1537 }
1538 k = error;
1539 sdp = sg_dev_arr[k];
1540
1541 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1542 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1543 "%s/generic", scsidp->devfs_name);
1544 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1545 if (error) {
1546 devfs_remove("%s/generic", scsidp->devfs_name);
1547 goto out;
1548 }
1549 sdp->cdev = cdev;
1550 if (sg_sysfs_valid) {
1551 struct class_device * sg_class_member;
1552
53f46542 1553 sg_class_member = class_device_create(sg_sysfs_class, NULL,
1da177e4
LT		 1554 MKDEV(SCSI_GENERIC_MAJOR, k),
1555 cl_dev->dev, "%s",
1556 disk->disk_name);
1557 if (IS_ERR(sg_class_member))
1558 printk(KERN_WARNING "sg_add: "
d253878b 1559 "class_device_create failed\n");
1da177e4
LT		 1560 class_set_devdata(sg_class_member, sdp);
1561 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1562 &sg_class_member->kobj, "generic");
1563 if (error)
1564 printk(KERN_ERR "sg_add: unable to make symlink "
1565 "'generic' back to sg%d\n", k);
1566 } else
1567 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1568
9ccfc756
JB		 1569 sdev_printk(KERN_NOTICE, scsidp,
1570 "Attached scsi generic sg%d type %d\n", k,scsidp->type);
1da177e4
LT		 1571
1572 return 0;
1573
1574out:
1575 put_disk(disk);
1576 if (cdev)
1577 cdev_del(cdev);
1578 return error;
1579}
1580
1581static void
d8539d81 1582sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1da177e4
LT		 1583{
1584 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1585 Sg_device *sdp = NULL;
1586 unsigned long iflags;
1587 Sg_fd *sfp;
1588 Sg_fd *tsfp;
1589 Sg_request *srp;
1590 Sg_request *tsrp;
1591 int k, delay;
1592
1593 if (NULL == sg_dev_arr)
1594 return;
1595 delay = 0;
1596 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1597 for (k = 0; k < sg_dev_max; k++) {
1598 sdp = sg_dev_arr[k];
1599 if ((NULL == sdp) || (sdp->device != scsidp))
1600 continue; /* dirty but lowers nesting */
1601 if (sdp->headfp) {
1602 sdp->detached = 1;
1603 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1604 tsfp = sfp->nextfp;
1605 for (srp = sfp->headrp; srp; srp = tsrp) {
1606 tsrp = srp->nextrp;
1607 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1608 sg_finish_rem_req(srp);
1609 }
1610 if (sfp->closed) {
1611 scsi_device_put(sdp->device);
1612 __sg_remove_sfp(sdp, sfp);
1613 } else {
1614 delay = 1;
1615 wake_up_interruptible(&sfp->read_wait);
1616 kill_fasync(&sfp->async_qp, SIGPOLL,
1617 POLL_HUP);
1618 }
1619 }
1620 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1621 if (NULL == sdp->headfp) {
1622 sg_dev_arr[k] = NULL;
1623 }
1624 } else { /* nothing active, simple case */
1625 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1626 sg_dev_arr[k] = NULL;
1627 }
1628 sg_nr_dev--;
1629 break;
1630 }
1631 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1632
1633 if (sdp) {
1634 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
d253878b 1635 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k));
1da177e4
LT		 1636 cdev_del(sdp->cdev);
1637 sdp->cdev = NULL;
1638 devfs_remove("%s/generic", scsidp->devfs_name);
1639 put_disk(sdp->disk);
1640 sdp->disk = NULL;
1641 if (NULL == sdp->headfp)
1642 kfree((char *) sdp);
1643 }
1644
1645 if (delay)
1646 msleep(10); /* dirty detach so delay device destruction */
1647}
1648
1649/* Set 'perm' (4th argument) to 0 to disable module_param's definition
1650 * of sysfs parameters (which module_param doesn't yet support).
1651 * Sysfs parameters defined explicitly below.
1652 */
1653module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
1654module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1655
1656MODULE_AUTHOR("Douglas Gilbert");
1657MODULE_DESCRIPTION("SCSI generic (sg) driver");
1658MODULE_LICENSE("GPL");
1659MODULE_VERSION(SG_VERSION_STR);
1660
1661MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1662MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1663
1664static int __init
1665init_sg(void)
1666{
1667 int rc;
1668
1669 if (def_reserved_size >= 0)
1670 sg_big_buff = def_reserved_size;
1671
1672 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1673 SG_MAX_DEVS, "sg");
1674 if (rc)
1675 return rc;
d253878b 1676 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1677 if ( IS_ERR(sg_sysfs_class) ) {
1678 rc = PTR_ERR(sg_sysfs_class);
1679 goto err_out;
1680 }
1681 sg_sysfs_valid = 1;
1682 rc = scsi_register_interface(&sg_interface);
1683 if (0 == rc) {
1684#ifdef CONFIG_SCSI_PROC_FS
1685 sg_proc_init();
1686#endif /* CONFIG_SCSI_PROC_FS */
1687 return 0;
1688 }
d253878b 1689 class_destroy(sg_sysfs_class);
1da177e4
LT		 1690err_out:
1691 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1692 return rc;
1693}
1694
1695static void __exit
1696exit_sg(void)
1697{
1698#ifdef CONFIG_SCSI_PROC_FS
1699 sg_proc_cleanup();
1700#endif /* CONFIG_SCSI_PROC_FS */
1701 scsi_unregister_interface(&sg_interface);
d253878b 1702 class_destroy(sg_sysfs_class);
1da177e4
LT		 1703 sg_sysfs_valid = 0;
1704 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1705 SG_MAX_DEVS);
1706 if (sg_dev_arr != NULL) {
1707 kfree((char *) sg_dev_arr);
1708 sg_dev_arr = NULL;
1709 }
1710 sg_dev_max = 0;
1711}
1712
1713static int
1714sg_start_req(Sg_request * srp)
1715{
1716 int res;
1717 Sg_fd *sfp = srp->parentfp;
1718 sg_io_hdr_t *hp = &srp->header;
1719 int dxfer_len = (int) hp->dxfer_len;
1720 int dxfer_dir = hp->dxfer_direction;
1721 Sg_scatter_hold *req_schp = &srp->data;
1722 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1723
1724 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1725 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1726 return 0;
1727 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1728 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1729 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1730 res = sg_build_direct(srp, sfp, dxfer_len);
1731 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1732 return res;
1733 }
1734 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1735 sg_link_reserve(sfp, srp, dxfer_len);
1736 else {
1737 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1738 if (res) {
1739 sg_remove_scat(req_schp);
1740 return res;
1741 }
1742 }
1743 return 0;
1744}
1745
1746static void
1747sg_finish_rem_req(Sg_request * srp)
1748{
1749 Sg_fd *sfp = srp->parentfp;
1750 Sg_scatter_hold *req_schp = &srp->data;
1751
1752 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1753 if (srp->res_used)
1754 sg_unlink_reserve(sfp, srp);
1755 else
1756 sg_remove_scat(req_schp);
1757 sg_remove_request(sfp, srp);
1758}
1759
1760static int
1761sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1762{
1763 int ret_sz;
1764 int elem_sz = sizeof (struct scatterlist);
1765 int sg_bufflen = tablesize * elem_sz;
1766 int mx_sc_elems = tablesize;
1767
1768 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1769 if (!schp->buffer)
1770 return -ENOMEM;
1771 else if (ret_sz != sg_bufflen) {
1772 sg_bufflen = ret_sz;
1773 mx_sc_elems = sg_bufflen / elem_sz;
1774 }
1775 schp->sglist_len = sg_bufflen;
1776 memset(schp->buffer, 0, sg_bufflen);
1777 return mx_sc_elems; /* number of scat_gath elements allocated */
1778}
1779
1780#ifdef SG_ALLOW_DIO_CODE
1781/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1782 /* hopefully this generic code will moved to a library */
1783
1784/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1785 - mapping of all pages not successful
1786 - any page is above max_pfn
1787 (i.e., either completely successful or fails)
1788*/
1789static int
1790st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1791 unsigned long uaddr, size_t count, int rw,
1792 unsigned long max_pfn)
1793{
deb92b7e
DG		 1794 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1795 unsigned long start = uaddr >> PAGE_SHIFT;
1796 const int nr_pages = end - start;
1da177e4 1797 int res, i, j;
1da177e4
LT		 1798 struct page **pages;
1799
1da177e4
LT		 1800 /* User attempted Overflow! */
1801 if ((uaddr + count) < uaddr)
1802 return -EINVAL;
1803
1804 /* Too big */
1805 if (nr_pages > max_pages)
1806 return -ENOMEM;
1807
1808 /* Hmm? */
1809 if (count == 0)
1810 return 0;
1811
1812 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1813 return -ENOMEM;
1814
1815 /* Try to fault in all of the necessary pages */
1816 down_read(&current->mm->mmap_sem);
1817 /* rw==READ means read from drive, write into memory area */
1818 res = get_user_pages(
1819 current,
1820 current->mm,
1821 uaddr,
1822 nr_pages,
1823 rw == READ,
1824 0, /* don't force */
1825 pages,
1826 NULL);
1827 up_read(&current->mm->mmap_sem);
1828
1829 /* Errors and no page mapped should return here */
1830 if (res < nr_pages)
1831 goto out_unmap;
1832
1833 for (i=0; i < nr_pages; i++) {
1834 /* FIXME: flush superflous for rw==READ,
1835 * probably wrong function for rw==WRITE
1836 */
1837 flush_dcache_page(pages[i]);
1838 if (page_to_pfn(pages[i]) > max_pfn)
1839 goto out_unlock;
1840 /* ?? Is locking needed? I don't think so */
1841 /* if (TestSetPageLocked(pages[i]))
1842 goto out_unlock; */
1843 }
1844
1845 /* Populate the scatter/gather list */
1846 sgl[0].page = pages[0];
1847 sgl[0].offset = uaddr & ~PAGE_MASK;
1848 if (nr_pages > 1) {
1849 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1850 count -= sgl[0].length;
1851 for (i=1; i < nr_pages ; i++) {
1852 sgl[i].offset = 0;
1853 sgl[i].page = pages[i];
1854 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1855 count -= PAGE_SIZE;
1856 }
1857 }
1858 else {
1859 sgl[0].length = count;
1860 }
1861
1862 kfree(pages);
1863 return nr_pages;
1864
1865 out_unlock:
1866 /* for (j=0; j < i; j++)
1867 unlock_page(pages[j]); */
1868 res = 0;
1869 out_unmap:
1870 if (res > 0)
1871 for (j=0; j < res; j++)
1872 page_cache_release(pages[j]);
1873 kfree(pages);
1874 return res;
1875}
1876
1877
1878/* And unmap them... */
1879static int
1880st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1881 int dirtied)
1882{
1883 int i;
1884
1885 for (i=0; i < nr_pages; i++) {
b5810039
NP		 1886 struct page *page = sgl[i].page;
1887
1888 /* XXX: just for debug. Remove when PageReserved is removed */
1889 BUG_ON(PageReserved(page));
1890 if (dirtied)
1891 SetPageDirty(page);
1892 /* unlock_page(page); */
1da177e4
LT		 1893 /* FIXME: cache flush missing for rw==READ
1894 * FIXME: call the correct reference counting function
1895 */
b5810039 1896 page_cache_release(page);
1da177e4
LT		 1897 }
1898
1899 return 0;
1900}
1901
1902/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1903#endif
1904
1905
1906/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1907static int
1908sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1909{
1910#ifdef SG_ALLOW_DIO_CODE
1911 sg_io_hdr_t *hp = &srp->header;
1912 Sg_scatter_hold *schp = &srp->data;
1913 int sg_tablesize = sfp->parentdp->sg_tablesize;
1914 struct scatterlist *sgl;
1915 int mx_sc_elems, res;
1916 struct scsi_device *sdev = sfp->parentdp->device;
1917
1918 if (((unsigned long)hp->dxferp &
1919 queue_dma_alignment(sdev->request_queue)) != 0)
1920 return 1;
1921 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1922 if (mx_sc_elems <= 0) {
1923 return 1;
1924 }
1925 sgl = (struct scatterlist *)schp->buffer;
1926 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1927 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1928 if (res <= 0)
1929 return 1;
1930 schp->k_use_sg = res;
1931 schp->dio_in_use = 1;
1932 hp->info |= SG_INFO_DIRECT_IO;
1933 return 0;
1934#else
1935 return 1;
1936#endif
1937}
1938
1939static int
1940sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1941{
1942 int ret_sz;
1943 int blk_size = buff_size;
1944 unsigned char *p = NULL;
1945
1946 if ((blk_size < 0) || (!sfp))
1947 return -EFAULT;
1948 if (0 == blk_size)
1949 ++blk_size; /* don't know why */
1950/* round request up to next highest SG_SECTOR_SZ byte boundary */
1951 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1952 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1953 buff_size, blk_size));
1954 if (blk_size <= SG_SCATTER_SZ) {
1955 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1956 if (!p)
1957 return -ENOMEM;
1958 if (blk_size == ret_sz) { /* got it on the first attempt */
1959 schp->k_use_sg = 0;
1960 schp->buffer = p;
1961 schp->bufflen = blk_size;
1962 schp->b_malloc_len = blk_size;
1963 return 0;
1964 }
1965 } else {
1966 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1967 if (!p)
1968 return -ENOMEM;
1969 }
1970/* Want some local declarations, so start new block ... */
1971 { /* lets try and build a scatter gather list */
1972 struct scatterlist *sclp;
1973 int k, rem_sz, num;
1974 int mx_sc_elems;
1975 int sg_tablesize = sfp->parentdp->sg_tablesize;
1976 int first = 1;
1977
1978 /* N.B. ret_sz carried into this block ... */
1979 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1980 if (mx_sc_elems < 0)
1981 return mx_sc_elems; /* most likely -ENOMEM */
1982
1983 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1984 (rem_sz > 0) && (k < mx_sc_elems);
1985 ++k, rem_sz -= ret_sz, ++sclp) {
1986 if (first)
1987 first = 0;
1988 else {
1989 num =
1990 (rem_sz >
1991 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1992 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1993 if (!p)
1994 break;
1995 }
378f058c 1996 sg_set_buf(sclp, p, ret_sz);
1da177e4
LT		 1997
1998 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1999 k, sg_scatg2virt(sclp), ret_sz));
2000 } /* end of for loop */
2001 schp->k_use_sg = k;
2002 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
2003 schp->bufflen = blk_size;
2004 if (rem_sz > 0) /* must have failed */
2005 return -ENOMEM;
2006 }
2007 return 0;
2008}
2009
2010static int
2011sg_write_xfer(Sg_request * srp)
2012{
2013 sg_io_hdr_t *hp = &srp->header;
2014 Sg_scatter_hold *schp = &srp->data;
2015 int num_xfer = 0;
2016 int j, k, onum, usglen, ksglen, res;
2017 int iovec_count = (int) hp->iovec_count;
2018 int dxfer_dir = hp->dxfer_direction;
2019 unsigned char *p;
2020 unsigned char __user *up;
2021 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2022
2023 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
2024 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2025 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
2026 if (schp->bufflen < num_xfer)
2027 num_xfer = schp->bufflen;
2028 }
2029 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2030 (new_interface
2031 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2032 return 0;
2033
2034 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2035 num_xfer, iovec_count, schp->k_use_sg));
2036 if (iovec_count) {
2037 onum = iovec_count;
2038 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2039 return -EFAULT;
2040 } else
2041 onum = 1;
2042
2043 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2044 for (j = 0, p = schp->buffer; j < onum; ++j) {
2045 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2046 if (res)
2047 return res;
2048 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2049 if (__copy_from_user(p, up, usglen))
2050 return -EFAULT;
2051 p += usglen;
2052 num_xfer -= usglen;
2053 if (num_xfer <= 0)
2054 return 0;
2055 }
2056 } else { /* kernel using scatter gather list */
2057 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2058
2059 ksglen = (int) sclp->length;
2060 p = sg_scatg2virt(sclp);
2061 for (j = 0, k = 0; j < onum; ++j) {
2062 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2063 if (res)
2064 return res;
2065
2066 for (; p; ++sclp, ksglen = (int) sclp->length,
2067 p = sg_scatg2virt(sclp)) {
2068 if (usglen <= 0)
2069 break;
2070 if (ksglen > usglen) {
2071 if (usglen >= num_xfer) {
2072 if (__copy_from_user
2073 (p, up, num_xfer))
2074 return -EFAULT;
2075 return 0;
2076 }
2077 if (__copy_from_user(p, up, usglen))
2078 return -EFAULT;
2079 p += usglen;
2080 ksglen -= usglen;
2081 break;
2082 } else {
2083 if (ksglen >= num_xfer) {
2084 if (__copy_from_user
2085 (p, up, num_xfer))
2086 return -EFAULT;
2087 return 0;
2088 }
2089 if (__copy_from_user(p, up, ksglen))
2090 return -EFAULT;
2091 up += ksglen;
2092 usglen -= ksglen;
2093 }
2094 ++k;
2095 if (k >= schp->k_use_sg)
2096 return 0;
2097 }
2098 }
2099 }
2100 return 0;
2101}
2102
2103static int
2104sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
2105 int wr_xf, int *countp, unsigned char __user **up)
2106{
2107 int num_xfer = (int) hp->dxfer_len;
2108 unsigned char __user *p = hp->dxferp;
2109 int count;
2110
2111 if (0 == sg_num) {
2112 if (wr_xf && ('\0' == hp->interface_id))
2113 count = (int) hp->flags; /* holds "old" input_size */
2114 else
2115 count = num_xfer;
2116 } else {
2117 sg_iovec_t iovec;
2118 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2119 return -EFAULT;
2120 p = iovec.iov_base;
2121 count = (int) iovec.iov_len;
2122 }
2123 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
2124 return -EFAULT;
2125 if (up)
2126 *up = p;
2127 if (countp)
2128 *countp = count;
2129 return 0;
2130}
2131
2132static void
2133sg_remove_scat(Sg_scatter_hold * schp)
2134{
2135 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2136 if (schp->buffer && (schp->sglist_len > 0)) {
2137 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2138
2139 if (schp->dio_in_use) {
2140#ifdef SG_ALLOW_DIO_CODE
2141 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2142#endif
2143 } else {
2144 int k;
2145
2146 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2147 ++k, ++sclp) {
2148 SCSI_LOG_TIMEOUT(5, printk(
2149 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2150 k, sg_scatg2virt(sclp), sclp->length));
2151 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2152 sclp->page = NULL;
2153 sclp->offset = 0;
2154 sclp->length = 0;
2155 }
2156 }
2157 sg_page_free(schp->buffer, schp->sglist_len);
2158 } else if (schp->buffer)
2159 sg_page_free(schp->buffer, schp->b_malloc_len);
2160 memset(schp, 0, sizeof (*schp));
2161}
2162
2163static int
2164sg_read_xfer(Sg_request * srp)
2165{
2166 sg_io_hdr_t *hp = &srp->header;
2167 Sg_scatter_hold *schp = &srp->data;
2168 int num_xfer = 0;
2169 int j, k, onum, usglen, ksglen, res;
2170 int iovec_count = (int) hp->iovec_count;
2171 int dxfer_dir = hp->dxfer_direction;
2172 unsigned char *p;
2173 unsigned char __user *up;
2174 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2175
2176 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2177 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2178 num_xfer = hp->dxfer_len;
2179 if (schp->bufflen < num_xfer)
2180 num_xfer = schp->bufflen;
2181 }
2182 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2183 (new_interface
2184 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2185 return 0;
2186
2187 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2188 num_xfer, iovec_count, schp->k_use_sg));
2189 if (iovec_count) {
2190 onum = iovec_count;
2191 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2192 return -EFAULT;
2193 } else
2194 onum = 1;
2195
2196 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2197 for (j = 0, p = schp->buffer; j < onum; ++j) {
2198 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2199 if (res)
2200 return res;
2201 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2202 if (__copy_to_user(up, p, usglen))
2203 return -EFAULT;
2204 p += usglen;
2205 num_xfer -= usglen;
2206 if (num_xfer <= 0)
2207 return 0;
2208 }
2209 } else { /* kernel using scatter gather list */
2210 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2211
2212 ksglen = (int) sclp->length;
2213 p = sg_scatg2virt(sclp);
2214 for (j = 0, k = 0; j < onum; ++j) {
2215 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2216 if (res)
2217 return res;
2218
2219 for (; p; ++sclp, ksglen = (int) sclp->length,
2220 p = sg_scatg2virt(sclp)) {
2221 if (usglen <= 0)
2222 break;
2223 if (ksglen > usglen) {
2224 if (usglen >= num_xfer) {
2225 if (__copy_to_user
2226 (up, p, num_xfer))
2227 return -EFAULT;
2228 return 0;
2229 }
2230 if (__copy_to_user(up, p, usglen))
2231 return -EFAULT;
2232 p += usglen;
2233 ksglen -= usglen;
2234 break;
2235 } else {
2236 if (ksglen >= num_xfer) {
2237 if (__copy_to_user
2238 (up, p, num_xfer))
2239 return -EFAULT;
2240 return 0;
2241 }
2242 if (__copy_to_user(up, p, ksglen))
2243 return -EFAULT;
2244 up += ksglen;
2245 usglen -= ksglen;
2246 }
2247 ++k;
2248 if (k >= schp->k_use_sg)
2249 return 0;
2250 }
2251 }
2252 }
2253 return 0;
2254}
2255
2256static int
2257sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2258{
2259 Sg_scatter_hold *schp = &srp->data;
2260
2261 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2262 num_read_xfer));
2263 if ((!outp) || (num_read_xfer <= 0))
2264 return 0;
2265 if (schp->k_use_sg > 0) {
2266 int k, num;
2267 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2268
2269 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2270 ++k, ++sclp) {
2271 num = (int) sclp->length;
2272 if (num > num_read_xfer) {
2273 if (__copy_to_user
2274 (outp, sg_scatg2virt(sclp), num_read_xfer))
2275 return -EFAULT;
2276 break;
2277 } else {
2278 if (__copy_to_user
2279 (outp, sg_scatg2virt(sclp), num))
2280 return -EFAULT;
2281 num_read_xfer -= num;
2282 if (num_read_xfer <= 0)
2283 break;
2284 outp += num;
2285 }
2286 }
2287 } else {
2288 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2289 return -EFAULT;
2290 }
2291 return 0;
2292}
2293
2294static void
2295sg_build_reserve(Sg_fd * sfp, int req_size)
2296{
2297 Sg_scatter_hold *schp = &sfp->reserve;
2298
2299 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2300 do {
2301 if (req_size < PAGE_SIZE)
2302 req_size = PAGE_SIZE;
2303 if (0 == sg_build_indirect(schp, sfp, req_size))
2304 return;
2305 else
2306 sg_remove_scat(schp);
2307 req_size >>= 1; /* divide by 2 */
2308 } while (req_size > (PAGE_SIZE / 2));
2309}
2310
2311static void
2312sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2313{
2314 Sg_scatter_hold *req_schp = &srp->data;
2315 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2316
2317 srp->res_used = 1;
2318 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2319 size = (size + 1) & (~1); /* round to even for aha1542 */
2320 if (rsv_schp->k_use_sg > 0) {
2321 int k, num;
2322 int rem = size;
2323 struct scatterlist *sclp =
2324 (struct scatterlist *) rsv_schp->buffer;
2325
2326 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2327 num = (int) sclp->length;
2328 if (rem <= num) {
2329 if (0 == k) {
2330 req_schp->k_use_sg = 0;
2331 req_schp->buffer = sg_scatg2virt(sclp);
2332 } else {
2333 sfp->save_scat_len = num;
2334 sclp->length = (unsigned) rem;
2335 req_schp->k_use_sg = k + 1;
2336 req_schp->sglist_len =
2337 rsv_schp->sglist_len;
2338 req_schp->buffer = rsv_schp->buffer;
2339 }
2340 req_schp->bufflen = size;
2341 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2342 break;
2343 } else
2344 rem -= num;
2345 }
2346 if (k >= rsv_schp->k_use_sg)
2347 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2348 } else {
2349 req_schp->k_use_sg = 0;
2350 req_schp->bufflen = size;
2351 req_schp->buffer = rsv_schp->buffer;
2352 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2353 }
2354}
2355
2356static void
2357sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2358{
2359 Sg_scatter_hold *req_schp = &srp->data;
2360 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2361
2362 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2363 (int) req_schp->k_use_sg));
2364 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2365 struct scatterlist *sclp =
2366 (struct scatterlist *) rsv_schp->buffer;
2367
2368 if (sfp->save_scat_len > 0)
2369 (sclp + (req_schp->k_use_sg - 1))->length =
2370 (unsigned) sfp->save_scat_len;
2371 else
2372 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2373 }
2374 req_schp->k_use_sg = 0;
2375 req_schp->bufflen = 0;
2376 req_schp->buffer = NULL;
2377 req_schp->sglist_len = 0;
2378 sfp->save_scat_len = 0;
2379 srp->res_used = 0;
2380}
2381
2382static Sg_request *
2383sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2384{
2385 Sg_request *resp;
2386 unsigned long iflags;
2387
2388 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2389 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2390 /* look for requests that are ready + not SG_IO owned */
2391 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2392 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2393 resp->done = 2; /* guard against other readers */
2394 break;
2395 }
2396 }
2397 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2398 return resp;
2399}
2400
2401#ifdef CONFIG_SCSI_PROC_FS
2402static Sg_request *
2403sg_get_nth_request(Sg_fd * sfp, int nth)
2404{
2405 Sg_request *resp;
2406 unsigned long iflags;
2407 int k;
2408
2409 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2410 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2411 ++k, resp = resp->nextrp) ;
2412 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2413 return resp;
2414}
2415#endif
2416
2417/* always adds to end of list */
2418static Sg_request *
2419sg_add_request(Sg_fd * sfp)
2420{
2421 int k;
2422 unsigned long iflags;
2423 Sg_request *resp;
2424 Sg_request *rp = sfp->req_arr;
2425
2426 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2427 resp = sfp->headrp;
2428 if (!resp) {
2429 memset(rp, 0, sizeof (Sg_request));
2430 rp->parentfp = sfp;
2431 resp = rp;
2432 sfp->headrp = resp;
2433 } else {
2434 if (0 == sfp->cmd_q)
2435 resp = NULL; /* command queuing disallowed */
2436 else {
2437 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2438 if (!rp->parentfp)
2439 break;
2440 }
2441 if (k < SG_MAX_QUEUE) {
2442 memset(rp, 0, sizeof (Sg_request));
2443 rp->parentfp = sfp;
2444 while (resp->nextrp)
2445 resp = resp->nextrp;
2446 resp->nextrp = rp;
2447 resp = rp;
2448 } else
2449 resp = NULL;
2450 }
2451 }
2452 if (resp) {
2453 resp->nextrp = NULL;
cb59e840 2454 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2455 resp->my_cmdp = NULL;
2456 }
2457 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2458 return resp;
2459}
2460
2461/* Return of 1 for found; 0 for not found */
2462static int
2463sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2464{
2465 Sg_request *prev_rp;
2466 Sg_request *rp;
2467 unsigned long iflags;
2468 int res = 0;
2469
2470 if ((!sfp) || (!srp) || (!sfp->headrp))
2471 return res;
2472 write_lock_irqsave(&sfp->rq_list_lock, iflags);
521314c1
BK		 2473 if (srp->my_cmdp)
2474 srp->my_cmdp->upper_private_data = NULL;
1da177e4
LT		 2475 prev_rp = sfp->headrp;
2476 if (srp == prev_rp) {
2477 sfp->headrp = prev_rp->nextrp;
2478 prev_rp->parentfp = NULL;
2479 res = 1;
2480 } else {
2481 while ((rp = prev_rp->nextrp)) {
2482 if (srp == rp) {
2483 prev_rp->nextrp = rp->nextrp;
2484 rp->parentfp = NULL;
2485 res = 1;
2486 break;
2487 }
2488 prev_rp = rp;
2489 }
2490 }
2491 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2492 return res;
2493}
2494
2495#ifdef CONFIG_SCSI_PROC_FS
2496static Sg_fd *
2497sg_get_nth_sfp(Sg_device * sdp, int nth)
2498{
2499 Sg_fd *resp;
2500 unsigned long iflags;
2501 int k;
2502
2503 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2504 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2505 ++k, resp = resp->nextfp) ;
2506 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2507 return resp;
2508}
2509#endif
2510
2511static Sg_fd *
2512sg_add_sfp(Sg_device * sdp, int dev)
2513{
2514 Sg_fd *sfp;
2515 unsigned long iflags;
2516
2517 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL);
2518 if (!sfp)
2519 return NULL;
2520 memset(sfp, 0, sizeof (Sg_fd));
2521 init_waitqueue_head(&sfp->read_wait);
2522 rwlock_init(&sfp->rq_list_lock);
2523
2524 sfp->timeout = SG_DEFAULT_TIMEOUT;
2525 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2526 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2527 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2528 sdp->device->host->unchecked_isa_dma : 1;
2529 sfp->cmd_q = SG_DEF_COMMAND_Q;
2530 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2531 sfp->parentdp = sdp;
2532 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2533 if (!sdp->headfp)
2534 sdp->headfp = sfp;
2535 else { /* add to tail of existing list */
2536 Sg_fd *pfp = sdp->headfp;
2537 while (pfp->nextfp)
2538 pfp = pfp->nextfp;
2539 pfp->nextfp = sfp;
2540 }
2541 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2542 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2543 sg_build_reserve(sfp, sg_big_buff);
2544 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2545 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2546 return sfp;
2547}
2548
2549static void
2550__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2551{
2552 Sg_fd *fp;
2553 Sg_fd *prev_fp;
2554
2555 prev_fp = sdp->headfp;
2556 if (sfp == prev_fp)
2557 sdp->headfp = prev_fp->nextfp;
2558 else {
2559 while ((fp = prev_fp->nextfp)) {
2560 if (sfp == fp) {
2561 prev_fp->nextfp = fp->nextfp;
2562 break;
2563 }
2564 prev_fp = fp;
2565 }
2566 }
2567 if (sfp->reserve.bufflen > 0) {
2568 SCSI_LOG_TIMEOUT(6,
2569 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2570 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2571 if (sfp->mmap_called)
2572 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2573 sg_remove_scat(&sfp->reserve);
2574 }
2575 sfp->parentdp = NULL;
2576 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2577 sg_page_free((char *) sfp, sizeof (Sg_fd));
2578}
2579
2580/* Returns 0 in normal case, 1 when detached and sdp object removed */
2581static int
2582sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2583{
2584 Sg_request *srp;
2585 Sg_request *tsrp;
2586 int dirty = 0;
2587 int res = 0;
2588
2589 for (srp = sfp->headrp; srp; srp = tsrp) {
2590 tsrp = srp->nextrp;
2591 if (sg_srp_done(srp, sfp))
2592 sg_finish_rem_req(srp);
2593 else
2594 ++dirty;
2595 }
2596 if (0 == dirty) {
2597 unsigned long iflags;
2598
2599 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2600 __sg_remove_sfp(sdp, sfp);
2601 if (sdp->detached && (NULL == sdp->headfp)) {
2602 int k, maxd;
2603
2604 maxd = sg_dev_max;
2605 for (k = 0; k < maxd; ++k) {
2606 if (sdp == sg_dev_arr[k])
2607 break;
2608 }
2609 if (k < maxd)
2610 sg_dev_arr[k] = NULL;
2611 kfree((char *) sdp);
2612 res = 1;
2613 }
2614 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2615 } else {
2616 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2617 /* only bump the access_count if we actually succeeded in
2618 * throwing another counter on the host module */
2619 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2620 sfp->closed = 1; /* flag dirty state on this fd */
2621 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2622 dirty));
2623 }
2624 return res;
2625}
2626
2627static int
2628sg_res_in_use(Sg_fd * sfp)
2629{
2630 const Sg_request *srp;
2631 unsigned long iflags;
2632
2633 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2634 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2635 if (srp->res_used)
2636 break;
2637 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2638 return srp ? 1 : 0;
2639}
2640
2641/* If retSzp==NULL want exact size or fail */
2642static char *
2643sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2644{
2645 char *resp = NULL;
c53033f6 2646 gfp_t page_mask;
1da177e4
LT		 2647 int order, a_size;
2648 int resSz = rqSz;
2649
2650 if (rqSz <= 0)
2651 return resp;
2652
2653 if (lowDma)
2654 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2655 else
2656 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2657
2658 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2659 order++, a_size <<= 1) ;
2660 resp = (char *) __get_free_pages(page_mask, order);
2661 while ((!resp) && order && retSzp) {
2662 --order;
2663 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2664 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2665 resSz = a_size;
2666 }
2667 if (resp) {
2668 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2669 memset(resp, 0, resSz);
2670 if (retSzp)
2671 *retSzp = resSz;
2672 }
2673 return resp;
2674}
2675
2676static void
2677sg_page_free(char *buff, int size)
2678{
2679 int order, a_size;
2680
2681 if (!buff)
2682 return;
2683 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2684 order++, a_size <<= 1) ;
2685 free_pages((unsigned long) buff, order);
2686}
2687
2688#ifndef MAINTENANCE_IN_CMD
2689#define MAINTENANCE_IN_CMD 0xa3
2690#endif
2691
2692static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2693 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2694 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2695 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2696};
2697
2698static int
2699sg_allow_access(unsigned char opcode, char dev_type)
2700{
2701 int k;
2702
2703 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2704 return 1;
2705 for (k = 0; k < sizeof (allow_ops); ++k) {
2706 if (opcode == allow_ops[k])
2707 return 1;
2708 }
2709 return 0;
2710}
2711
2712#ifdef CONFIG_SCSI_PROC_FS
2713static int
2714sg_last_dev(void)
2715{
2716 int k;
2717 unsigned long iflags;
2718
2719 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2720 for (k = sg_dev_max - 1; k >= 0; --k)
2721 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2722 break;
2723 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2724 return k + 1; /* origin 1 */
2725}
2726#endif
2727
2728static Sg_device *
2729sg_get_dev(int dev)
2730{
2731 Sg_device *sdp = NULL;
2732 unsigned long iflags;
2733
2734 if (sg_dev_arr && (dev >= 0)) {
2735 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2736 if (dev < sg_dev_max)
2737 sdp = sg_dev_arr[dev];
2738 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2739 }
2740 return sdp;
2741}
2742
2743#ifdef CONFIG_SCSI_PROC_FS
2744
2745static struct proc_dir_entry *sg_proc_sgp = NULL;
2746
2747static char sg_proc_sg_dirname[] = "scsi/sg";
2748
2749static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2750
2751static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2752static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2753 size_t count, loff_t *off);
2754static struct file_operations adio_fops = {
2755 /* .owner, .read and .llseek added in sg_proc_init() */
2756 .open = sg_proc_single_open_adio,
2757 .write = sg_proc_write_adio,
2758 .release = single_release,
2759};
2760
2761static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2762static ssize_t sg_proc_write_dressz(struct file *filp,
2763 const char __user *buffer, size_t count, loff_t *off);
2764static struct file_operations dressz_fops = {
2765 .open = sg_proc_single_open_dressz,
2766 .write = sg_proc_write_dressz,
2767 .release = single_release,
2768};
2769
2770static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2771static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2772static struct file_operations version_fops = {
2773 .open = sg_proc_single_open_version,
2774 .release = single_release,
2775};
2776
2777static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2778static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2779static struct file_operations devhdr_fops = {
2780 .open = sg_proc_single_open_devhdr,
2781 .release = single_release,
2782};
2783
2784static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2785static int sg_proc_open_dev(struct inode *inode, struct file *file);
2786static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2787static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2788static void dev_seq_stop(struct seq_file *s, void *v);
2789static struct file_operations dev_fops = {
2790 .open = sg_proc_open_dev,
2791 .release = seq_release,
2792};
2793static struct seq_operations dev_seq_ops = {
2794 .start = dev_seq_start,
2795 .next = dev_seq_next,
2796 .stop = dev_seq_stop,
2797 .show = sg_proc_seq_show_dev,
2798};
2799
2800static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2801static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2802static struct file_operations devstrs_fops = {
2803 .open = sg_proc_open_devstrs,
2804 .release = seq_release,
2805};
2806static struct seq_operations devstrs_seq_ops = {
2807 .start = dev_seq_start,
2808 .next = dev_seq_next,
2809 .stop = dev_seq_stop,
2810 .show = sg_proc_seq_show_devstrs,
2811};
2812
2813static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2814static int sg_proc_open_debug(struct inode *inode, struct file *file);
2815static struct file_operations debug_fops = {
2816 .open = sg_proc_open_debug,
2817 .release = seq_release,
2818};
2819static struct seq_operations debug_seq_ops = {
2820 .start = dev_seq_start,
2821 .next = dev_seq_next,
2822 .stop = dev_seq_stop,
2823 .show = sg_proc_seq_show_debug,
2824};
2825
2826
2827struct sg_proc_leaf {
2828 const char * name;
2829 struct file_operations * fops;
2830};
2831
2832static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2833 {"allow_dio", &adio_fops},
2834 {"debug", &debug_fops},
2835 {"def_reserved_size", &dressz_fops},
2836 {"device_hdr", &devhdr_fops},
2837 {"devices", &dev_fops},
2838 {"device_strs", &devstrs_fops},
2839 {"version", &version_fops}
2840};
2841
2842static int
2843sg_proc_init(void)
2844{
2845 int k, mask;
2846 int num_leaves =
2847 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2848 struct proc_dir_entry *pdep;
2849 struct sg_proc_leaf * leaf;
2850
66600221 2851 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2852 if (!sg_proc_sgp)
2853 return 1;
2854 for (k = 0; k < num_leaves; ++k) {
2855 leaf = &sg_proc_leaf_arr[k];
2856 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2857 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2858 if (pdep) {
2859 leaf->fops->owner = THIS_MODULE,
2860 leaf->fops->read = seq_read,
2861 leaf->fops->llseek = seq_lseek,
2862 pdep->proc_fops = leaf->fops;
2863 }
2864 }
2865 return 0;
2866}
2867
2868static void
2869sg_proc_cleanup(void)
2870{
2871 int k;
2872 int num_leaves =
2873 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2874
2875 if (!sg_proc_sgp)
2876 return;
2877 for (k = 0; k < num_leaves; ++k)
2878 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2879 remove_proc_entry(sg_proc_sg_dirname, NULL);
2880}
2881
2882
2883static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2884{
2885 seq_printf(s, "%d\n", *((int *)s->private));
2886 return 0;
2887}
2888
2889static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2890{
2891 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2892}
2893
2894static ssize_t
2895sg_proc_write_adio(struct file *filp, const char __user *buffer,
2896 size_t count, loff_t *off)
2897{
2898 int num;
2899 char buff[11];
2900
2901 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2902 return -EACCES;
2903 num = (count < 10) ? count : 10;
2904 if (copy_from_user(buff, buffer, num))
2905 return -EFAULT;
2906 buff[num] = '\0';
2907 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2908 return count;
2909}
2910
2911static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2912{
2913 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2914}
2915
2916static ssize_t
2917sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2918 size_t count, loff_t *off)
2919{
2920 int num;
2921 unsigned long k = ULONG_MAX;
2922 char buff[11];
2923
2924 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2925 return -EACCES;
2926 num = (count < 10) ? count : 10;
2927 if (copy_from_user(buff, buffer, num))
2928 return -EFAULT;
2929 buff[num] = '\0';
2930 k = simple_strtoul(buff, NULL, 10);
2931 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2932 sg_big_buff = k;
2933 return count;
2934 }
2935 return -ERANGE;
2936}
2937
2938static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2939{
2940 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2941 sg_version_date);
2942 return 0;
2943}
2944
2945static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2946{
2947 return single_open(file, sg_proc_seq_show_version, NULL);
2948}
2949
2950static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2951{
2952 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2953 "online\n");
2954 return 0;
2955}
2956
2957static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2958{
2959 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2960}
2961
2962struct sg_proc_deviter {
2963 loff_t index;
2964 size_t max;
2965};
2966
2967static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2968{
2969 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2970
729d70f5 2971 s->private = it;
1da177e4
LT		 2972 if (! it)
2973 return NULL;
729d70f5 2974
1da177e4 2975 if (NULL == sg_dev_arr)
729d70f5 2976 return NULL;
1da177e4
LT		 2977 it->index = *pos;
2978 it->max = sg_last_dev();
2979 if (it->index >= it->max)
729d70f5 2980 return NULL;
1da177e4 2981 return it;
1da177e4
LT		 2982}
2983
2984static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2985{
729d70f5 2986 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2987
2988 *pos = ++it->index;
2989 return (it->index < it->max) ? it : NULL;
2990}
2991
2992static void dev_seq_stop(struct seq_file *s, void *v)
2993{
729d70f5 2994 kfree(s->private);
1da177e4
LT		 2995}
2996
2997static int sg_proc_open_dev(struct inode *inode, struct file *file)
2998{
2999 return seq_open(file, &dev_seq_ops);
3000}
3001
3002static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
3003{
3004 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3005 Sg_device *sdp;
3006 struct scsi_device *scsidp;
3007
3008 sdp = it ? sg_get_dev(it->index) : NULL;
3009 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
3010 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
3011 scsidp->host->host_no, scsidp->channel,
3012 scsidp->id, scsidp->lun, (int) scsidp->type,
3013 1,
3014 (int) scsidp->queue_depth,
3015 (int) scsidp->device_busy,
3016 (int) scsi_device_online(scsidp));
3017 else
3018 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
3019 return 0;
3020}
3021
3022static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
3023{
3024 return seq_open(file, &devstrs_seq_ops);
3025}
3026
3027static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
3028{
3029 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3030 Sg_device *sdp;
3031 struct scsi_device *scsidp;
3032
3033 sdp = it ? sg_get_dev(it->index) : NULL;
3034 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
3035 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
3036 scsidp->vendor, scsidp->model, scsidp->rev);
3037 else
3038 seq_printf(s, "<no active device>\n");
3039 return 0;
3040}
3041
3042static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
3043{
3044 int k, m, new_interface, blen, usg;
3045 Sg_request *srp;
3046 Sg_fd *fp;
3047 const sg_io_hdr_t *hp;
3048 const char * cp;
cb59e840 3049 unsigned int ms;
1da177e4
LT		 3050
3051 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
3052 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3053 "(res)sgat=%d low_dma=%d\n", k + 1,
3054 jiffies_to_msecs(fp->timeout),
3055 fp->reserve.bufflen,
3056 (int) fp->reserve.k_use_sg,
3057 (int) fp->low_dma);
3058 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
3059 (int) fp->cmd_q, (int) fp->force_packid,
3060 (int) fp->keep_orphan, (int) fp->closed);
3061 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
3062 hp = &srp->header;
3063 new_interface = (hp->interface_id == '\0') ? 0 : 1;
3064 if (srp->res_used) {
3065 if (new_interface &&
3066 (SG_FLAG_MMAP_IO & hp->flags))
3067 cp = " mmap>> ";
3068 else
3069 cp = " rb>> ";
3070 } else {
3071 if (SG_INFO_DIRECT_IO_MASK & hp->info)
3072 cp = " dio>> ";
3073 else
3074 cp = " ";
3075 }
3076 seq_printf(s, cp);
3077 blen = srp->my_cmdp ?
3078 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
3079 usg = srp->my_cmdp ?
3080 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
3081 seq_printf(s, srp->done ?
3082 ((1 == srp->done) ? "rcv:" : "fin:")
3083 : (srp->my_cmdp ? "act:" : "prior:"));
3084 seq_printf(s, " id=%d blen=%d",
3085 srp->header.pack_id, blen);
3086 if (srp->done)
3087 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 3088 else {
3089 ms = jiffies_to_msecs(jiffies);
1da177e4 3090 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 3091 (new_interface ? hp->timeout :
3092 jiffies_to_msecs(fp->timeout)),
3093 (ms > hp->duration ? ms - hp->duration : 0));
3094 }
1da177e4
LT		 3095 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
3096 (int) srp->data.cmd_opcode);
3097 }
3098 if (0 == m)
3099 seq_printf(s, " No requests active\n");
3100 }
3101}
3102
3103static int sg_proc_open_debug(struct inode *inode, struct file *file)
3104{
3105 return seq_open(file, &debug_seq_ops);
3106}
3107
3108static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3109{
3110 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3111 Sg_device *sdp;
3112
3113 if (it && (0 == it->index)) {
3114 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3115 "(origin 1)\n", sg_dev_max, (int)it->max);
3116 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3117 }
3118 sdp = it ? sg_get_dev(it->index) : NULL;
3119 if (sdp) {
3120 struct scsi_device *scsidp = sdp->device;
3121
3122 if (NULL == scsidp) {
3123 seq_printf(s, "device %d detached ??\n",
3124 (int)it->index);
3125 return 0;
3126 }
3127
3128 if (sg_get_nth_sfp(sdp, 0)) {
3129 seq_printf(s, " >>> device=%s ",
3130 sdp->disk->disk_name);
3131 if (sdp->detached)
3132 seq_printf(s, "detached pending close ");
3133 else
3134 seq_printf
3135 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3136 scsidp->host->host_no,
3137 scsidp->channel, scsidp->id,
3138 scsidp->lun,
3139 scsidp->host->hostt->emulated);
3140 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3141 sdp->sg_tablesize, sdp->exclude);
3142 }
3143 sg_proc_debug_helper(s, sdp);
3144 }
3145 return 0;
3146}
3147
3148#endif /* CONFIG_SCSI_PROC_FS */
3149
3150module_init(init_sg);
3151module_exit(exit_sg);
3152MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
kernel source for telekom puls (alcatel/mediatek)