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block: move cmdfilter from gendisk to request_queue
[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
b2155d04
DG		 21static int sg_version_num = 30534; /* 2 digits for each component */
22#define SG_VERSION_STR "3.5.34"
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 */
1da177e4
LT		 31#include <linux/module.h>
32
33#include <linux/fs.h>
34#include <linux/kernel.h>
35#include <linux/sched.h>
36#include <linux/string.h>
37#include <linux/mm.h>
38#include <linux/errno.h>
39#include <linux/mtio.h>
40#include <linux/ioctl.h>
41#include <linux/fcntl.h>
42#include <linux/init.h>
43#include <linux/poll.h>
1da177e4 44#include <linux/moduleparam.h>
1da177e4 45#include <linux/cdev.h>
7c07d613 46#include <linux/idr.h>
1da177e4
LT		 47#include <linux/seq_file.h>
48#include <linux/blkdev.h>
49#include <linux/delay.h>
378f058c 50#include <linux/scatterlist.h>
6da127ad 51#include <linux/blktrace_api.h>
eb09d3d4 52#include <linux/smp_lock.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>
7ca63cb4 65static char *sg_version_date = "20061027";
1da177e4
LT		 66
67static int sg_proc_init(void);
68static void sg_proc_cleanup(void);
69#endif
70
1da177e4
LT		 71#define SG_ALLOW_DIO_DEF 0
72#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
73
74#define SG_MAX_DEVS 32768
75
76/*
77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
78 * Then when using 32 bit integers x * m may overflow during the calculation.
79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
80 * calculates the same, but prevents the overflow when both m and d
81 * are "small" numbers (like HZ and USER_HZ).
82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
83 * in 32 bits.
84 */
85#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
86
87#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
88
89int sg_big_buff = SG_DEF_RESERVED_SIZE;
90/* N.B. This variable is readable and writeable via
91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
92 of this size (or less if there is not enough memory) will be reserved
93 for use by this file descriptor. [Deprecated usage: this variable is also
94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
95 the kernel (i.e. it is not a module).] */
96static int def_reserved_size = -1; /* picks up init parameter */
97static int sg_allow_dio = SG_ALLOW_DIO_DEF;
98
6460e75a
DG		 99static int scatter_elem_sz = SG_SCATTER_SZ;
100static int scatter_elem_sz_prev = SG_SCATTER_SZ;
101
1da177e4
LT		 102#define SG_SECTOR_SZ 512
103#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
104
ee959b00
TJ		 105static int sg_add(struct device *, struct class_interface *);
106static void sg_remove(struct device *, struct class_interface *);
1da177e4 107
7c07d613
JB		 108static DEFINE_IDR(sg_index_idr);
109static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
1da177e4
LT		 110 file descriptor list for device */
111
112static struct class_interface sg_interface = {
ee959b00
TJ		 113 .add_dev = sg_add,
114 .remove_dev = sg_remove,
1da177e4
LT		 115};
116
117typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
118 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 119 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4
LT		 120 unsigned bufflen; /* Size of (aggregate) data buffer */
121 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
d6b10348 122 struct scatterlist *buffer;/* scatter list */
1da177e4
LT		 123 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
124 unsigned char cmd_opcode; /* first byte of command */
125} Sg_scatter_hold;
126
127struct sg_device; /* forward declarations */
128struct sg_fd;
129
130typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 131 struct sg_request *nextrp; /* NULL -> tail request (slist) */
132 struct sg_fd *parentfp; /* NULL -> not in use */
133 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
134 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 135 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 136 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
137 char orphan; /* 1 -> drop on sight, 0 -> normal */
138 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
139 volatile char done; /* 0->before bh, 1->before read, 2->read */
140} Sg_request;
141
142typedef struct sg_fd { /* holds the state of a file descriptor */
143 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
144 struct sg_device *parentdp; /* owning device */
145 wait_queue_head_t read_wait; /* queue read until command done */
146 rwlock_t rq_list_lock; /* protect access to list in req_arr */
147 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
148 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
149 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
150 unsigned save_scat_len; /* original length of trunc. scat. element */
151 Sg_request *headrp; /* head of request slist, NULL->empty */
152 struct fasync_struct *async_qp; /* used by asynchronous notification */
153 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
154 char low_dma; /* as in parent but possibly overridden to 1 */
155 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
156 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
157 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
158 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
159 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
160 char mmap_called; /* 0 -> mmap() never called on this fd */
161} Sg_fd;
162
163typedef struct sg_device { /* holds the state of each scsi generic device */
164 struct scsi_device *device;
165 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
166 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 167 u32 index; /* device index number */
1da177e4
LT		 168 Sg_fd *headfp; /* first open fd belonging to this device */
169 volatile char detached; /* 0->attached, 1->detached pending removal */
170 volatile char exclude; /* opened for exclusive access */
171 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
172 struct gendisk *disk;
173 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
174} Sg_device;
175
176static int sg_fasync(int fd, struct file *filp, int mode);
d6b10348
MC		 177/* tasklet or soft irq callback */
178static void sg_cmd_done(void *data, char *sense, int result, int resid);
1da177e4
LT		 179static int sg_start_req(Sg_request * srp);
180static void sg_finish_rem_req(Sg_request * srp);
181static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
182static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
183 int tablesize);
184static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
185 Sg_request * srp);
0b07de85
AG		 186static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
187 const char __user *buf, size_t count, int blocking,
188 int read_only, Sg_request **o_srp);
1da177e4
LT		 189static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
190 unsigned char *cmnd, int timeout, int blocking);
191static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
192 int wr_xf, int *countp, unsigned char __user **up);
193static int sg_write_xfer(Sg_request * srp);
194static int sg_read_xfer(Sg_request * srp);
195static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
196static void sg_remove_scat(Sg_scatter_hold * schp);
197static void sg_build_reserve(Sg_fd * sfp, int req_size);
198static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
199static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
d6b10348
MC		 200static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
201static void sg_page_free(struct page *page, int size);
1da177e4
LT		 202static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
203static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
204static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
205static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
206static Sg_request *sg_add_request(Sg_fd * sfp);
207static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
208static int sg_res_in_use(Sg_fd * sfp);
1da177e4
LT		 209static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
210static Sg_device *sg_get_dev(int dev);
1da177e4
LT		 211#ifdef CONFIG_SCSI_PROC_FS
212static int sg_last_dev(void);
213#endif
214
1da177e4
LT		 215#define SZ_SG_HEADER sizeof(struct sg_header)
216#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
217#define SZ_SG_IOVEC sizeof(sg_iovec_t)
218#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
219
220static int
221sg_open(struct inode *inode, struct file *filp)
222{
223 int dev = iminor(inode);
224 int flags = filp->f_flags;
d6b10348 225 struct request_queue *q;
1da177e4
LT		 226 Sg_device *sdp;
227 Sg_fd *sfp;
228 int res;
229 int retval;
230
eb09d3d4 231 lock_kernel();
1da177e4
LT		 232 nonseekable_open(inode, filp);
233 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
234 sdp = sg_get_dev(dev);
eb09d3d4
JC		 235 if ((!sdp) || (!sdp->device)) {
236 unlock_kernel();
1da177e4 237 return -ENXIO;
eb09d3d4
JC		 238 }
239 if (sdp->detached) {
240 unlock_kernel();
1da177e4 241 return -ENODEV;
eb09d3d4 242 }
1da177e4
LT		 243
244 /* This driver's module count bumped by fops_get in <linux/fs.h> */
245 /* Prevent the device driver from vanishing while we sleep */
246 retval = scsi_device_get(sdp->device);
eb09d3d4
JC		 247 if (retval) {
248 unlock_kernel();
1da177e4 249 return retval;
eb09d3d4 250 }
1da177e4
LT		 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;
d6b10348
MC		 294 q = sdp->device->request_queue;
295 sdp->sg_tablesize = min(q->max_hw_segments,
296 q->max_phys_segments);
1da177e4
LT		 297 }
298 if ((sfp = sg_add_sfp(sdp, dev)))
299 filp->private_data = sfp;
300 else {
301 if (flags & O_EXCL)
302 sdp->exclude = 0; /* undo if error */
303 retval = -ENOMEM;
304 goto error_out;
305 }
eb09d3d4 306 unlock_kernel();
1da177e4
LT		 307 return 0;
308
309 error_out:
310 scsi_device_put(sdp->device);
eb09d3d4 311 unlock_kernel();
1da177e4
LT		 312 return retval;
313}
314
315/* Following function was formerly called 'sg_close' */
316static int
317sg_release(struct inode *inode, struct file *filp)
318{
319 Sg_device *sdp;
320 Sg_fd *sfp;
321
322 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
323 return -ENXIO;
324 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
325 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
326 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
327 if (!sdp->detached) {
328 scsi_device_put(sdp->device);
329 }
330 sdp->exclude = 0;
331 wake_up_interruptible(&sdp->o_excl_wait);
332 }
333 return 0;
334}
335
336static ssize_t
337sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
338{
1da177e4
LT		 339 Sg_device *sdp;
340 Sg_fd *sfp;
341 Sg_request *srp;
342 int req_pack_id = -1;
1da177e4 343 sg_io_hdr_t *hp;
cb59e840
DG		 344 struct sg_header *old_hdr = NULL;
345 int retval = 0;
1da177e4
LT		 346
347 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
348 return -ENXIO;
349 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
350 sdp->disk->disk_name, (int) count));
d6b10348 351
1da177e4
LT		 352 if (!access_ok(VERIFY_WRITE, buf, count))
353 return -EFAULT;
354 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 355 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
356 if (!old_hdr)
357 return -ENOMEM;
358 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
359 retval = -EFAULT;
360 goto free_old_hdr;
361 }
362 if (old_hdr->reply_len < 0) {
1da177e4 363 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 364 sg_io_hdr_t *new_hdr;
365 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
366 if (!new_hdr) {
367 retval = -ENOMEM;
368 goto free_old_hdr;
369 }
370 retval =__copy_from_user
371 (new_hdr, buf, SZ_SG_IO_HDR);
372 req_pack_id = new_hdr->pack_id;
373 kfree(new_hdr);
374 if (retval) {
375 retval = -EFAULT;
376 goto free_old_hdr;
377 }
1da177e4
LT		 378 }
379 } else
cb59e840 380 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 381 }
382 srp = sg_get_rq_mark(sfp, req_pack_id);
383 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 384 if (sdp->detached) {
385 retval = -ENODEV;
386 goto free_old_hdr;
387 }
388 if (filp->f_flags & O_NONBLOCK) {
389 retval = -EAGAIN;
390 goto free_old_hdr;
391 }
1da177e4 392 while (1) {
cb59e840 393 retval = 0; /* following macro beats race condition */
1da177e4 394 __wait_event_interruptible(sfp->read_wait,
cb59e840
DG		 395 (sdp->detached ||
396 (srp = sg_get_rq_mark(sfp, req_pack_id))),
397 retval);
398 if (sdp->detached) {
399 retval = -ENODEV;
400 goto free_old_hdr;
401 }
402 if (0 == retval)
1da177e4 403 break;
cb59e840
DG		 404
405 /* -ERESTARTSYS as signal hit process */
406 goto free_old_hdr;
1da177e4
LT		 407 }
408 }
cb59e840
DG		 409 if (srp->header.interface_id != '\0') {
410 retval = sg_new_read(sfp, buf, count, srp);
411 goto free_old_hdr;
412 }
1da177e4
LT		 413
414 hp = &srp->header;
cb59e840
DG		 415 if (old_hdr == NULL) {
416 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
417 if (! old_hdr) {
418 retval = -ENOMEM;
419 goto free_old_hdr;
420 }
421 }
422 memset(old_hdr, 0, SZ_SG_HEADER);
423 old_hdr->reply_len = (int) hp->timeout;
424 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
425 old_hdr->pack_id = hp->pack_id;
426 old_hdr->twelve_byte =
1da177e4 427 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 428 old_hdr->target_status = hp->masked_status;
429 old_hdr->host_status = hp->host_status;
430 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 431 if ((CHECK_CONDITION & hp->masked_status) ||
432 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 433 memcpy(old_hdr->sense_buffer, srp->sense_b,
434 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 435 switch (hp->host_status) {
436 /* This setup of 'result' is for backward compatibility and is best
437 ignored by the user who should use target, host + driver status */
438 case DID_OK:
439 case DID_PASSTHROUGH:
440 case DID_SOFT_ERROR:
cb59e840 441 old_hdr->result = 0;
1da177e4
LT		 442 break;
443 case DID_NO_CONNECT:
444 case DID_BUS_BUSY:
445 case DID_TIME_OUT:
cb59e840 446 old_hdr->result = EBUSY;
1da177e4
LT		 447 break;
448 case DID_BAD_TARGET:
449 case DID_ABORT:
450 case DID_PARITY:
451 case DID_RESET:
452 case DID_BAD_INTR:
cb59e840 453 old_hdr->result = EIO;
1da177e4
LT		 454 break;
455 case DID_ERROR:
cb59e840 456 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 457 hp->masked_status == GOOD) ? 0 : EIO;
458 break;
459 default:
cb59e840 460 old_hdr->result = EIO;
1da177e4
LT		 461 break;
462 }
463
464 /* Now copy the result back to the user buffer. */
465 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 466 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
467 retval = -EFAULT;
468 goto free_old_hdr;
469 }
1da177e4 470 buf += SZ_SG_HEADER;
cb59e840
DG		 471 if (count > old_hdr->reply_len)
472 count = old_hdr->reply_len;
1da177e4 473 if (count > SZ_SG_HEADER) {
cb59e840
DG		 474 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
475 retval = -EFAULT;
476 goto free_old_hdr;
477 }
1da177e4
LT		 478 }
479 } else
cb59e840 480 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 481 sg_finish_rem_req(srp);
cb59e840
DG		 482 retval = count;
483free_old_hdr:
c9475cb0 484 kfree(old_hdr);
cb59e840 485 return retval;
1da177e4
LT		 486}
487
488static ssize_t
489sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
490{
491 sg_io_hdr_t *hp = &srp->header;
492 int err = 0;
493 int len;
494
495 if (count < SZ_SG_IO_HDR) {
496 err = -EINVAL;
497 goto err_out;
498 }
499 hp->sb_len_wr = 0;
500 if ((hp->mx_sb_len > 0) && hp->sbp) {
501 if ((CHECK_CONDITION & hp->masked_status) ||
502 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 503 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 504 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
505 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
506 len = (len > sb_len) ? sb_len : len;
507 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
508 err = -EFAULT;
509 goto err_out;
510 }
511 hp->sb_len_wr = len;
512 }
513 }
514 if (hp->masked_status || hp->host_status || hp->driver_status)
515 hp->info |= SG_INFO_CHECK;
516 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
517 err = -EFAULT;
518 goto err_out;
519 }
520 err = sg_read_xfer(srp);
521 err_out:
522 sg_finish_rem_req(srp);
523 return (0 == err) ? count : err;
524}
525
526static ssize_t
527sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
528{
529 int mxsize, cmd_size, k;
530 int input_size, blocking;
531 unsigned char opcode;
532 Sg_device *sdp;
533 Sg_fd *sfp;
534 Sg_request *srp;
535 struct sg_header old_hdr;
536 sg_io_hdr_t *hp;
d6b10348 537 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 538
539 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
540 return -ENXIO;
541 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
542 sdp->disk->disk_name, (int) count));
543 if (sdp->detached)
544 return -ENODEV;
545 if (!((filp->f_flags & O_NONBLOCK) ||
546 scsi_block_when_processing_errors(sdp->device)))
547 return -ENXIO;
548
549 if (!access_ok(VERIFY_READ, buf, count))
550 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
551 if (count < SZ_SG_HEADER)
552 return -EIO;
553 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
554 return -EFAULT;
555 blocking = !(filp->f_flags & O_NONBLOCK);
556 if (old_hdr.reply_len < 0)
0b07de85 557 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL);
1da177e4
LT		 558 if (count < (SZ_SG_HEADER + 6))
559 return -EIO; /* The minimum scsi command length is 6 bytes. */
560
561 if (!(srp = sg_add_request(sfp))) {
562 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
563 return -EDOM;
564 }
565 buf += SZ_SG_HEADER;
566 __get_user(opcode, buf);
567 if (sfp->next_cmd_len > 0) {
568 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
569 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
570 sfp->next_cmd_len = 0;
571 sg_remove_request(sfp, srp);
572 return -EIO;
573 }
574 cmd_size = sfp->next_cmd_len;
575 sfp->next_cmd_len = 0; /* reset so only this write() effected */
576 } else {
577 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
578 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
579 cmd_size = 12;
580 }
581 SCSI_LOG_TIMEOUT(4, printk(
582 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
583/* Determine buffer size. */
584 input_size = count - cmd_size;
585 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
586 mxsize -= SZ_SG_HEADER;
587 input_size -= SZ_SG_HEADER;
588 if (input_size < 0) {
589 sg_remove_request(sfp, srp);
590 return -EIO; /* User did not pass enough bytes for this command. */
591 }
592 hp = &srp->header;
593 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
594 hp->cmd_len = (unsigned char) cmd_size;
595 hp->iovec_count = 0;
596 hp->mx_sb_len = 0;
597 if (input_size > 0)
598 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
599 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
600 else
601 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
602 hp->dxfer_len = mxsize;
603 hp->dxferp = (char __user *)buf + cmd_size;
604 hp->sbp = NULL;
605 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
606 hp->flags = input_size; /* structure abuse ... */
607 hp->pack_id = old_hdr.pack_id;
608 hp->usr_ptr = NULL;
609 if (__copy_from_user(cmnd, buf, cmd_size))
610 return -EFAULT;
611 /*
612 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
613 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
614 * is a non-zero input_size, so emit a warning.
615 */
eaa3e22e
AK		 616 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
617 static char cmd[TASK_COMM_LEN];
618 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
1da177e4
LT		 619 printk(KERN_WARNING
620 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
621 "guessing data in;\n" KERN_WARNING " "
622 "program %s not setting count and/or reply_len properly\n",
623 old_hdr.reply_len - (int)SZ_SG_HEADER,
624 input_size, (unsigned int) cmnd[0],
625 current->comm);
eaa3e22e
AK		 626 strcpy(cmd, current->comm);
627 }
628 }
1da177e4
LT		 629 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
630 return (k < 0) ? k : count;
631}
632
633static ssize_t
0b07de85
AG		 634sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
635 size_t count, int blocking, int read_only,
636 Sg_request **o_srp)
1da177e4
LT		 637{
638 int k;
639 Sg_request *srp;
640 sg_io_hdr_t *hp;
d6b10348 641 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 642 int timeout;
643 unsigned long ul_timeout;
abf54393 644 struct request_queue *q;
1da177e4
LT		 645
646 if (count < SZ_SG_IO_HDR)
647 return -EINVAL;
648 if (!access_ok(VERIFY_READ, buf, count))
649 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
650
651 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
652 if (!(srp = sg_add_request(sfp))) {
653 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
654 return -EDOM;
655 }
656 hp = &srp->header;
657 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
658 sg_remove_request(sfp, srp);
659 return -EFAULT;
660 }
661 if (hp->interface_id != 'S') {
662 sg_remove_request(sfp, srp);
663 return -ENOSYS;
664 }
665 if (hp->flags & SG_FLAG_MMAP_IO) {
666 if (hp->dxfer_len > sfp->reserve.bufflen) {
667 sg_remove_request(sfp, srp);
668 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
669 }
670 if (hp->flags & SG_FLAG_DIRECT_IO) {
671 sg_remove_request(sfp, srp);
672 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
673 }
674 if (sg_res_in_use(sfp)) {
675 sg_remove_request(sfp, srp);
676 return -EBUSY; /* reserve buffer already being used */
677 }
678 }
679 ul_timeout = msecs_to_jiffies(srp->header.timeout);
680 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
681 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
682 sg_remove_request(sfp, srp);
683 return -EMSGSIZE;
684 }
685 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
686 sg_remove_request(sfp, srp);
687 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
688 }
689 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
690 sg_remove_request(sfp, srp);
691 return -EFAULT;
692 }
abf54393
FT		 693 q = sfp->parentdp->device->request_queue;
694 if (read_only && blk_verify_command(&q->cmd_filter, cmnd,
695 file->f_mode & FMODE_WRITE)) {
1da177e4
LT		 696 sg_remove_request(sfp, srp);
697 return -EPERM;
698 }
699 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
700 if (k < 0)
701 return k;
702 if (o_srp)
703 *o_srp = srp;
704 return count;
705}
706
707static int
708sg_common_write(Sg_fd * sfp, Sg_request * srp,
709 unsigned char *cmnd, int timeout, int blocking)
710{
d6b10348 711 int k, data_dir;
1da177e4
LT		 712 Sg_device *sdp = sfp->parentdp;
713 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 714
715 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
716 hp->status = 0;
717 hp->masked_status = 0;
718 hp->msg_status = 0;
719 hp->info = 0;
720 hp->host_status = 0;
721 hp->driver_status = 0;
722 hp->resid = 0;
723 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
724 (int) cmnd[0], (int) hp->cmd_len));
725
726 if ((k = sg_start_req(srp))) {
7ca63cb4 727 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 728 sg_finish_rem_req(srp);
729 return k; /* probably out of space --> ENOMEM */
730 }
731 if ((k = sg_write_xfer(srp))) {
7ca63cb4 732 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
1da177e4
LT		 733 sg_finish_rem_req(srp);
734 return k;
735 }
736 if (sdp->detached) {
737 sg_finish_rem_req(srp);
738 return -ENODEV;
739 }
1da177e4 740
1da177e4
LT		 741 switch (hp->dxfer_direction) {
742 case SG_DXFER_TO_FROM_DEV:
743 case SG_DXFER_FROM_DEV:
d6b10348 744 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 745 break;
746 case SG_DXFER_TO_DEV:
d6b10348 747 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 748 break;
749 case SG_DXFER_UNKNOWN:
d6b10348 750 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 751 break;
752 default:
d6b10348 753 data_dir = DMA_NONE;
1da177e4
LT		 754 break;
755 }
cb59e840 756 hp->duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 757/* Now send everything of to mid-level. The next time we hear about this
758 packet is when sg_cmd_done() is called (i.e. a callback). */
bb1d1073 759 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
d6b10348
MC		 760 hp->dxfer_len, srp->data.k_use_sg, timeout,
761 SG_DEFAULT_RETRIES, srp, sg_cmd_done,
762 GFP_ATOMIC)) {
7ca63cb4 763 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
d6b10348
MC		 764 /*
765 * most likely out of mem, but could also be a bad map
766 */
18c49b8c 767 sg_finish_rem_req(srp);
d6b10348
MC		 768 return -ENOMEM;
769 } else
770 return 0;
1da177e4
LT		 771}
772
773static int
774sg_srp_done(Sg_request *srp, Sg_fd *sfp)
775{
776 unsigned long iflags;
777 int done;
778
779 read_lock_irqsave(&sfp->rq_list_lock, iflags);
780 done = srp->done;
781 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
782 return done;
783}
784
785static int
786sg_ioctl(struct inode *inode, struct file *filp,
787 unsigned int cmd_in, unsigned long arg)
788{
789 void __user *p = (void __user *)arg;
790 int __user *ip = p;
791 int result, val, read_only;
792 Sg_device *sdp;
793 Sg_fd *sfp;
794 Sg_request *srp;
795 unsigned long iflags;
796
797 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
798 return -ENXIO;
abf54393 799
1da177e4
LT		 800 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
801 sdp->disk->disk_name, (int) cmd_in));
802 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
803
804 switch (cmd_in) {
805 case SG_IO:
806 {
807 int blocking = 1; /* ignore O_NONBLOCK flag */
808
809 if (sdp->detached)
810 return -ENODEV;
811 if (!scsi_block_when_processing_errors(sdp->device))
812 return -ENXIO;
813 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
814 return -EFAULT;
815 result =
0b07de85 816 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
1da177e4
LT		 817 blocking, read_only, &srp);
818 if (result < 0)
819 return result;
820 srp->sg_io_owned = 1;
821 while (1) {
822 result = 0; /* following macro to beat race condition */
823 __wait_event_interruptible(sfp->read_wait,
824 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
825 result);
826 if (sdp->detached)
827 return -ENODEV;
828 if (sfp->closed)
829 return 0; /* request packet dropped already */
830 if (0 == result)
831 break;
832 srp->orphan = 1;
833 return result; /* -ERESTARTSYS because signal hit process */
834 }
835 write_lock_irqsave(&sfp->rq_list_lock, iflags);
836 srp->done = 2;
837 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
838 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
839 return (result < 0) ? result : 0;
840 }
841 case SG_SET_TIMEOUT:
842 result = get_user(val, ip);
843 if (result)
844 return result;
845 if (val < 0)
846 return -EIO;
847 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
848 val = MULDIV (INT_MAX, USER_HZ, HZ);
849 sfp->timeout_user = val;
850 sfp->timeout = MULDIV (val, HZ, USER_HZ);
851
852 return 0;
853 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
854 /* strange ..., for backward compatibility */
855 return sfp->timeout_user;
856 case SG_SET_FORCE_LOW_DMA:
857 result = get_user(val, ip);
858 if (result)
859 return result;
860 if (val) {
861 sfp->low_dma = 1;
862 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
863 val = (int) sfp->reserve.bufflen;
864 sg_remove_scat(&sfp->reserve);
865 sg_build_reserve(sfp, val);
866 }
867 } else {
868 if (sdp->detached)
869 return -ENODEV;
870 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
871 }
872 return 0;
873 case SG_GET_LOW_DMA:
874 return put_user((int) sfp->low_dma, ip);
875 case SG_GET_SCSI_ID:
876 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
877 return -EFAULT;
878 else {
879 sg_scsi_id_t __user *sg_idp = p;
880
881 if (sdp->detached)
882 return -ENODEV;
883 __put_user((int) sdp->device->host->host_no,
884 &sg_idp->host_no);
885 __put_user((int) sdp->device->channel,
886 &sg_idp->channel);
887 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
888 __put_user((int) sdp->device->lun, &sg_idp->lun);
889 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
890 __put_user((short) sdp->device->host->cmd_per_lun,
891 &sg_idp->h_cmd_per_lun);
892 __put_user((short) sdp->device->queue_depth,
893 &sg_idp->d_queue_depth);
894 __put_user(0, &sg_idp->unused[0]);
895 __put_user(0, &sg_idp->unused[1]);
896 return 0;
897 }
898 case SG_SET_FORCE_PACK_ID:
899 result = get_user(val, ip);
900 if (result)
901 return result;
902 sfp->force_packid = val ? 1 : 0;
903 return 0;
904 case SG_GET_PACK_ID:
905 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
906 return -EFAULT;
907 read_lock_irqsave(&sfp->rq_list_lock, iflags);
908 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
909 if ((1 == srp->done) && (!srp->sg_io_owned)) {
910 read_unlock_irqrestore(&sfp->rq_list_lock,
911 iflags);
912 __put_user(srp->header.pack_id, ip);
913 return 0;
914 }
915 }
916 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
917 __put_user(-1, ip);
918 return 0;
919 case SG_GET_NUM_WAITING:
920 read_lock_irqsave(&sfp->rq_list_lock, iflags);
921 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
922 if ((1 == srp->done) && (!srp->sg_io_owned))
923 ++val;
924 }
925 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
926 return put_user(val, ip);
927 case SG_GET_SG_TABLESIZE:
928 return put_user(sdp->sg_tablesize, ip);
929 case SG_SET_RESERVED_SIZE:
930 result = get_user(val, ip);
931 if (result)
932 return result;
933 if (val < 0)
934 return -EINVAL;
44ec9542
AS		 935 val = min_t(int, val,
936 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 937 if (val != sfp->reserve.bufflen) {
938 if (sg_res_in_use(sfp) || sfp->mmap_called)
939 return -EBUSY;
940 sg_remove_scat(&sfp->reserve);
941 sg_build_reserve(sfp, val);
942 }
943 return 0;
944 case SG_GET_RESERVED_SIZE:
44ec9542
AS		 945 val = min_t(int, sfp->reserve.bufflen,
946 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 947 return put_user(val, ip);
948 case SG_SET_COMMAND_Q:
949 result = get_user(val, ip);
950 if (result)
951 return result;
952 sfp->cmd_q = val ? 1 : 0;
953 return 0;
954 case SG_GET_COMMAND_Q:
955 return put_user((int) sfp->cmd_q, ip);
956 case SG_SET_KEEP_ORPHAN:
957 result = get_user(val, ip);
958 if (result)
959 return result;
960 sfp->keep_orphan = val;
961 return 0;
962 case SG_GET_KEEP_ORPHAN:
963 return put_user((int) sfp->keep_orphan, ip);
964 case SG_NEXT_CMD_LEN:
965 result = get_user(val, ip);
966 if (result)
967 return result;
968 sfp->next_cmd_len = (val > 0) ? val : 0;
969 return 0;
970 case SG_GET_VERSION_NUM:
971 return put_user(sg_version_num, ip);
972 case SG_GET_ACCESS_COUNT:
973 /* faked - we don't have a real access count anymore */
974 val = (sdp->device ? 1 : 0);
975 return put_user(val, ip);
976 case SG_GET_REQUEST_TABLE:
977 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
978 return -EFAULT;
979 else {
cb59e840
DG		 980 sg_req_info_t *rinfo;
981 unsigned int ms;
982
983 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
984 GFP_KERNEL);
985 if (!rinfo)
986 return -ENOMEM;
1da177e4
LT		 987 read_lock_irqsave(&sfp->rq_list_lock, iflags);
988 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
989 ++val, srp = srp ? srp->nextrp : srp) {
990 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
991 if (srp) {
992 rinfo[val].req_state = srp->done + 1;
993 rinfo[val].problem =
994 srp->header.masked_status &
995 srp->header.host_status &
996 srp->header.driver_status;
cb59e840
DG		 997 if (srp->done)
998 rinfo[val].duration =
999 srp->header.duration;
1000 else {
1001 ms = jiffies_to_msecs(jiffies);
1002 rinfo[val].duration =
1003 (ms > srp->header.duration) ?
1004 (ms - srp->header.duration) : 0;
1005 }
1da177e4 1006 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 1007 rinfo[val].sg_io_owned =
1008 srp->sg_io_owned;
1009 rinfo[val].pack_id =
1010 srp->header.pack_id;
1011 rinfo[val].usr_ptr =
1012 srp->header.usr_ptr;
1da177e4
LT		 1013 }
1014 }
1015 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1016 result = __copy_to_user(p, rinfo,
1017 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1018 result = result ? -EFAULT : 0;
1019 kfree(rinfo);
1020 return result;
1da177e4
LT		 1021 }
1022 case SG_EMULATED_HOST:
1023 if (sdp->detached)
1024 return -ENODEV;
1025 return put_user(sdp->device->host->hostt->emulated, ip);
1026 case SG_SCSI_RESET:
1027 if (sdp->detached)
1028 return -ENODEV;
1029 if (filp->f_flags & O_NONBLOCK) {
939647ee 1030 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1031 return -EBUSY;
1032 } else if (!scsi_block_when_processing_errors(sdp->device))
1033 return -EBUSY;
1034 result = get_user(val, ip);
1035 if (result)
1036 return result;
1037 if (SG_SCSI_RESET_NOTHING == val)
1038 return 0;
1039 switch (val) {
1040 case SG_SCSI_RESET_DEVICE:
1041 val = SCSI_TRY_RESET_DEVICE;
1042 break;
39120e11
BK		 1043 case SG_SCSI_RESET_TARGET:
1044 val = SCSI_TRY_RESET_TARGET;
1045 break;
1da177e4
LT		 1046 case SG_SCSI_RESET_BUS:
1047 val = SCSI_TRY_RESET_BUS;
1048 break;
1049 case SG_SCSI_RESET_HOST:
1050 val = SCSI_TRY_RESET_HOST;
1051 break;
1052 default:
1053 return -EINVAL;
1054 }
1055 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1056 return -EACCES;
1057 return (scsi_reset_provider(sdp->device, val) ==
1058 SUCCESS) ? 0 : -EIO;
1059 case SCSI_IOCTL_SEND_COMMAND:
1060 if (sdp->detached)
1061 return -ENODEV;
1062 if (read_only) {
1063 unsigned char opcode = WRITE_6;
abf54393 1064 struct request_queue *q = sdp->device->request_queue;
1da177e4
LT		 1065 Scsi_Ioctl_Command __user *siocp = p;
1066
1067 if (copy_from_user(&opcode, siocp->data, 1))
1068 return -EFAULT;
abf54393
FT		 1069 if (blk_verify_command(&q->cmd_filter,
1070 &opcode,
1071 filp->f_mode & FMODE_WRITE))
1da177e4
LT		 1072 return -EPERM;
1073 }
21b2f0c8 1074 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
1da177e4
LT		 1075 case SG_SET_DEBUG:
1076 result = get_user(val, ip);
1077 if (result)
1078 return result;
1079 sdp->sgdebug = (char) val;
1080 return 0;
1081 case SCSI_IOCTL_GET_IDLUN:
1082 case SCSI_IOCTL_GET_BUS_NUMBER:
1083 case SCSI_IOCTL_PROBE_HOST:
1084 case SG_GET_TRANSFORM:
1085 if (sdp->detached)
1086 return -ENODEV;
1087 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542
AS		 1088 case BLKSECTGET:
1089 return put_user(sdp->device->request_queue->max_sectors * 512,
1090 ip);
6da127ad
CS		 1091 case BLKTRACESETUP:
1092 return blk_trace_setup(sdp->device->request_queue,
1093 sdp->disk->disk_name,
1094 sdp->device->sdev_gendev.devt,
1095 (char *)arg);
1096 case BLKTRACESTART:
1097 return blk_trace_startstop(sdp->device->request_queue, 1);
1098 case BLKTRACESTOP:
1099 return blk_trace_startstop(sdp->device->request_queue, 0);
1100 case BLKTRACETEARDOWN:
1101 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1102 default:
1103 if (read_only)
1104 return -EPERM; /* don't know so take safe approach */
1105 return scsi_ioctl(sdp->device, cmd_in, p);
1106 }
1107}
1108
1109#ifdef CONFIG_COMPAT
1110static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1111{
1112 Sg_device *sdp;
1113 Sg_fd *sfp;
1114 struct scsi_device *sdev;
1115
1116 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1117 return -ENXIO;
1118
1119 sdev = sdp->device;
1120 if (sdev->host->hostt->compat_ioctl) {
1121 int ret;
1122
1123 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1124
1125 return ret;
1126 }
1127
1128 return -ENOIOCTLCMD;
1129}
1130#endif
1131
1132static unsigned int
1133sg_poll(struct file *filp, poll_table * wait)
1134{
1135 unsigned int res = 0;
1136 Sg_device *sdp;
1137 Sg_fd *sfp;
1138 Sg_request *srp;
1139 int count = 0;
1140 unsigned long iflags;
1141
1142 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1143 || sfp->closed)
1144 return POLLERR;
1145 poll_wait(filp, &sfp->read_wait, wait);
1146 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1147 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1148 /* if any read waiting, flag it */
1149 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1150 res = POLLIN | POLLRDNORM;
1151 ++count;
1152 }
1153 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1154
1155 if (sdp->detached)
1156 res |= POLLHUP;
1157 else if (!sfp->cmd_q) {
1158 if (0 == count)
1159 res |= POLLOUT | POLLWRNORM;
1160 } else if (count < SG_MAX_QUEUE)
1161 res |= POLLOUT | POLLWRNORM;
1162 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1163 sdp->disk->disk_name, (int) res));
1164 return res;
1165}
1166
1167static int
1168sg_fasync(int fd, struct file *filp, int mode)
1169{
1170 int retval;
1171 Sg_device *sdp;
1172 Sg_fd *sfp;
1173
1174 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1175 return -ENXIO;
1176 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1177 sdp->disk->disk_name, mode));
1178
1179 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1180 return (retval < 0) ? retval : 0;
1181}
1182
a13ff0bb
NP		 1183static int
1184sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1185{
1186 Sg_fd *sfp;
d6b10348 1187 unsigned long offset, len, sa;
1da177e4 1188 Sg_scatter_hold *rsv_schp;
d6b10348
MC		 1189 struct scatterlist *sg;
1190 int k;
1da177e4
LT		 1191
1192 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1193 return VM_FAULT_SIGBUS;
1da177e4 1194 rsv_schp = &sfp->reserve;
a13ff0bb 1195 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1196 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1197 return VM_FAULT_SIGBUS;
1198 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1199 offset, rsv_schp->k_use_sg));
d6b10348
MC		 1200 sg = rsv_schp->buffer;
1201 sa = vma->vm_start;
1202 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
b0f655d0 1203 ++k, sg = sg_next(sg)) {
d6b10348
MC		 1204 len = vma->vm_end - sa;
1205 len = (len < sg->length) ? len : sg->length;
1206 if (offset < len) {
a13ff0bb 1207 struct page *page;
45711f1a 1208 page = virt_to_page(page_address(sg_page(sg)) + offset);
d6b10348 1209 get_page(page); /* increment page count */
a13ff0bb
NP		 1210 vmf->page = page;
1211 return 0; /* success */
1da177e4 1212 }
d6b10348
MC		 1213 sa += len;
1214 offset -= len;
1da177e4 1215 }
d6b10348 1216
a13ff0bb 1217 return VM_FAULT_SIGBUS;
1da177e4
LT		 1218}
1219
1220static struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1221 .fault = sg_vma_fault,
1da177e4
LT		 1222};
1223
1224static int
1225sg_mmap(struct file *filp, struct vm_area_struct *vma)
1226{
1227 Sg_fd *sfp;
d6b10348 1228 unsigned long req_sz, len, sa;
1da177e4 1229 Sg_scatter_hold *rsv_schp;
d6b10348
MC		 1230 int k;
1231 struct scatterlist *sg;
1da177e4
LT		 1232
1233 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1234 return -ENXIO;
cb59e840 1235 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1236 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1237 (void *) vma->vm_start, (int) req_sz));
1238 if (vma->vm_pgoff)
1239 return -EINVAL; /* want no offset */
1240 rsv_schp = &sfp->reserve;
1241 if (req_sz > rsv_schp->bufflen)
1242 return -ENOMEM; /* cannot map more than reserved buffer */
1243
d6b10348
MC		 1244 sa = vma->vm_start;
1245 sg = rsv_schp->buffer;
1246 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
b0f655d0 1247 ++k, sg = sg_next(sg)) {
d6b10348
MC		 1248 len = vma->vm_end - sa;
1249 len = (len < sg->length) ? len : sg->length;
1250 sa += len;
1da177e4 1251 }
d6b10348 1252
f9aed0e2 1253 sfp->mmap_called = 1;
1c8e71d7 1254 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1255 vma->vm_private_data = sfp;
1256 vma->vm_ops = &sg_mmap_vm_ops;
1257 return 0;
1258}
1259
1260/* This function is a "bottom half" handler that is called by the
1261 * mid level when a command is completed (or has failed). */
1262static void
d6b10348 1263sg_cmd_done(void *data, char *sense, int result, int resid)
1da177e4 1264{
d6b10348 1265 Sg_request *srp = data;
1da177e4
LT		 1266 Sg_device *sdp = NULL;
1267 Sg_fd *sfp;
1da177e4 1268 unsigned long iflags;
cb59e840 1269 unsigned int ms;
1da177e4 1270
1da177e4
LT		 1271 if (NULL == srp) {
1272 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1da177e4
LT		 1273 return;
1274 }
1275 sfp = srp->parentfp;
1276 if (sfp)
1277 sdp = sfp->parentdp;
1278 if ((NULL == sdp) || sdp->detached) {
1279 printk(KERN_INFO "sg_cmd_done: device detached\n");
1da177e4
LT		 1280 return;
1281 }
1282
1da177e4
LT		 1283
1284 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1285 sdp->disk->disk_name, srp->header.pack_id, result));
1286 srp->header.resid = resid;
cb59e840
DG		 1287 ms = jiffies_to_msecs(jiffies);
1288 srp->header.duration = (ms > srp->header.duration) ?
1289 (ms - srp->header.duration) : 0;
d6b10348 1290 if (0 != result) {
1da177e4
LT		 1291 struct scsi_sense_hdr sshdr;
1292
d6b10348
MC		 1293 memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
1294 srp->header.status = 0xff & result;
1295 srp->header.masked_status = status_byte(result);
1296 srp->header.msg_status = msg_byte(result);
1297 srp->header.host_status = host_byte(result);
1298 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1299 if ((sdp->sgdebug > 0) &&
1300 ((CHECK_CONDITION == srp->header.masked_status) ||
1301 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1302 __scsi_print_sense("sg_cmd_done", sense,
1303 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1304
1305 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1306 if (driver_byte(result) != 0
1307 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1308 && !scsi_sense_is_deferred(&sshdr)
1309 && sshdr.sense_key == UNIT_ATTENTION
1310 && sdp->device->removable) {
1311 /* Detected possible disc change. Set the bit - this */
1312 /* may be used if there are filesystems using this device */
1313 sdp->device->changed = 1;
1314 }
1315 }
1316 /* Rely on write phase to clean out srp status values, so no "else" */
1317
1da177e4
LT		 1318 if (sfp->closed) { /* whoops this fd already released, cleanup */
1319 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1320 sg_finish_rem_req(srp);
1321 srp = NULL;
1322 if (NULL == sfp->headrp) {
7ca63cb4 1323 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1da177e4
LT		 1324 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1325 scsi_device_put(sdp->device);
1326 }
1327 sfp = NULL;
1328 }
1329 } else if (srp && srp->orphan) {
1330 if (sfp->keep_orphan)
1331 srp->sg_io_owned = 0;
1332 else {
1333 sg_finish_rem_req(srp);
1334 srp = NULL;
1335 }
1336 }
1337 if (sfp && srp) {
1338 /* Now wake up any sg_read() that is waiting for this packet. */
1339 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1340 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1341 srp->done = 1;
1342 wake_up_interruptible(&sfp->read_wait);
1343 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1344 }
1345}
1346
1347static struct file_operations sg_fops = {
1348 .owner = THIS_MODULE,
1349 .read = sg_read,
1350 .write = sg_write,
1351 .poll = sg_poll,
1352 .ioctl = sg_ioctl,
1353#ifdef CONFIG_COMPAT
1354 .compat_ioctl = sg_compat_ioctl,
1355#endif
1356 .open = sg_open,
1357 .mmap = sg_mmap,
1358 .release = sg_release,
1359 .fasync = sg_fasync,
1360};
1361
d253878b 1362static struct class *sg_sysfs_class;
1da177e4
LT		 1363
1364static int sg_sysfs_valid = 0;
1365
7c07d613 1366static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1367{
d6b10348 1368 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1369 Sg_device *sdp;
1370 unsigned long iflags;
7c07d613
JB		 1371 int error;
1372 u32 k;
1da177e4 1373
24669f75 1374 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1375 if (!sdp) {
1376 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1377 return ERR_PTR(-ENOMEM);
1378 }
1379 error = -ENOMEM;
1380 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1381 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1382 goto out;
1da177e4
LT		 1383 }
1384
7c07d613
JB		 1385 write_lock_irqsave(&sg_index_lock, iflags);
1386 error = idr_get_new(&sg_index_idr, sdp, &k);
1387 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1388
7c07d613
JB		 1389 if (error) {
1390 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1391 error);
1392 goto out;
1da177e4
LT		 1393 }
1394
1da177e4
LT		 1395 if (unlikely(k >= SG_MAX_DEVS))
1396 goto overflow;
1397
1da177e4
LT		 1398 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1399 sprintf(disk->disk_name, "sg%d", k);
1400 disk->first_minor = k;
1401 sdp->disk = disk;
1402 sdp->device = scsidp;
1403 init_waitqueue_head(&sdp->o_excl_wait);
d6b10348 1404 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
7c07d613 1405 sdp->index = k;
1da177e4 1406
7c07d613 1407 error = 0;
1da177e4 1408 out:
7c07d613 1409 if (error) {
1da177e4 1410 kfree(sdp);
7c07d613
JB		 1411 return ERR_PTR(error);
1412 }
1413 return sdp;
1da177e4
LT		 1414
1415 overflow:
9ccfc756
JB		 1416 sdev_printk(KERN_WARNING, scsidp,
1417 "Unable to attach sg device type=%d, minor "
1418 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1419 error = -ENODEV;
1420 goto out;
1421}
1422
1423static int
ee959b00 1424sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1425{
ee959b00 1426 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1427 struct gendisk *disk;
1428 Sg_device *sdp = NULL;
1429 struct cdev * cdev = NULL;
7c07d613 1430 int error;
454e8957 1431 unsigned long iflags;
1da177e4
LT		 1432
1433 disk = alloc_disk(1);
1434 if (!disk) {
1435 printk(KERN_WARNING "alloc_disk failed\n");
1436 return -ENOMEM;
1437 }
1438 disk->major = SCSI_GENERIC_MAJOR;
1439
1440 error = -ENOMEM;
1441 cdev = cdev_alloc();
1442 if (!cdev) {
1443 printk(KERN_WARNING "cdev_alloc failed\n");
1444 goto out;
1445 }
1446 cdev->owner = THIS_MODULE;
1447 cdev->ops = &sg_fops;
1448
7c07d613
JB		 1449 sdp = sg_alloc(disk, scsidp);
1450 if (IS_ERR(sdp)) {
1da177e4 1451 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1452 error = PTR_ERR(sdp);
1da177e4
LT		 1453 goto out;
1454 }
1da177e4 1455
7c07d613 1456 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1457 if (error)
454e8957 1458 goto cdev_add_err;
5e3c34c1 1459
1da177e4
LT		 1460 sdp->cdev = cdev;
1461 if (sg_sysfs_valid) {
ee959b00 1462 struct device *sg_class_member;
1da177e4 1463
24b42566
GKH		 1464 sg_class_member = device_create_drvdata(sg_sysfs_class,
1465 cl_dev->parent,
1466 MKDEV(SCSI_GENERIC_MAJOR,
1467 sdp->index),
1468 sdp,
1469 "%s", disk->disk_name);
d07e0361
FT		 1470 if (IS_ERR(sg_class_member)) {
1471 printk(KERN_ERR "sg_add: "
ee959b00 1472 "device_create failed\n");
d07e0361
FT		 1473 error = PTR_ERR(sg_class_member);
1474 goto cdev_add_err;
1475 }
d07e0361 1476 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1477 &sg_class_member->kobj, "generic");
1478 if (error)
1479 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1480 "'generic' back to sg%d\n", sdp->index);
1da177e4 1481 } else
7c07d613 1482 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1483
9ccfc756 1484 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1485 "Attached scsi generic sg%d type %d\n", sdp->index,
1486 scsidp->type);
1da177e4 1487
ee959b00 1488 dev_set_drvdata(cl_dev, sdp);
a24484f2 1489
1da177e4
LT		 1490 return 0;
1491
454e8957 1492cdev_add_err:
7c07d613
JB		 1493 write_lock_irqsave(&sg_index_lock, iflags);
1494 idr_remove(&sg_index_idr, sdp->index);
1495 write_unlock_irqrestore(&sg_index_lock, iflags);
1496 kfree(sdp);
454e8957 1497
1da177e4
LT		 1498out:
1499 put_disk(disk);
1500 if (cdev)
1501 cdev_del(cdev);
1502 return error;
1503}
1504
1505static void
ee959b00 1506sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1507{
ee959b00
TJ		 1508 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1509 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1510 unsigned long iflags;
1511 Sg_fd *sfp;
1512 Sg_fd *tsfp;
1513 Sg_request *srp;
1514 Sg_request *tsrp;
7c07d613 1515 int delay;
1da177e4 1516
7c07d613 1517 if (!sdp)
1da177e4 1518 return;
7c07d613 1519
1da177e4 1520 delay = 0;
7c07d613
JB		 1521 write_lock_irqsave(&sg_index_lock, iflags);
1522 if (sdp->headfp) {
1523 sdp->detached = 1;
1524 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1525 tsfp = sfp->nextfp;
1526 for (srp = sfp->headrp; srp; srp = tsrp) {
1527 tsrp = srp->nextrp;
1528 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1529 sg_finish_rem_req(srp);
1da177e4 1530 }
7c07d613
JB		 1531 if (sfp->closed) {
1532 scsi_device_put(sdp->device);
1533 __sg_remove_sfp(sdp, sfp);
1534 } else {
1535 delay = 1;
1536 wake_up_interruptible(&sfp->read_wait);
1537 kill_fasync(&sfp->async_qp, SIGPOLL,
1538 POLL_HUP);
1da177e4 1539 }
1da177e4 1540 }
7c07d613
JB		 1541 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1542 if (NULL == sdp->headfp) {
1543 idr_remove(&sg_index_idr, sdp->index);
1544 }
1545 } else { /* nothing active, simple case */
1546 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1547 idr_remove(&sg_index_idr, sdp->index);
1548 }
1549 write_unlock_irqrestore(&sg_index_lock, iflags);
1550
1551 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1552 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1553 cdev_del(sdp->cdev);
1554 sdp->cdev = NULL;
1555 put_disk(sdp->disk);
1556 sdp->disk = NULL;
1557 if (NULL == sdp->headfp)
1558 kfree(sdp);
1da177e4
LT		 1559
1560 if (delay)
1561 msleep(10); /* dirty detach so delay device destruction */
1562}
1563
6460e75a
DG		 1564module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1565module_param_named(def_reserved_size, def_reserved_size, int,
1566 S_IRUGO | S_IWUSR);
1da177e4
LT		 1567module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1568
1569MODULE_AUTHOR("Douglas Gilbert");
1570MODULE_DESCRIPTION("SCSI generic (sg) driver");
1571MODULE_LICENSE("GPL");
1572MODULE_VERSION(SG_VERSION_STR);
f018fa55 1573MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1574
6460e75a
DG		 1575MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1576 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1577MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1578MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1579
1580static int __init
1581init_sg(void)
1582{
1583 int rc;
1584
6460e75a
DG		 1585 if (scatter_elem_sz < PAGE_SIZE) {
1586 scatter_elem_sz = PAGE_SIZE;
1587 scatter_elem_sz_prev = scatter_elem_sz;
1588 }
1da177e4
LT		 1589 if (def_reserved_size >= 0)
1590 sg_big_buff = def_reserved_size;
6460e75a
DG		 1591 else
1592 def_reserved_size = sg_big_buff;
1da177e4
LT		 1593
1594 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1595 SG_MAX_DEVS, "sg");
1596 if (rc)
1597 return rc;
d253878b 1598 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1599 if ( IS_ERR(sg_sysfs_class) ) {
1600 rc = PTR_ERR(sg_sysfs_class);
1601 goto err_out;
1602 }
1603 sg_sysfs_valid = 1;
1604 rc = scsi_register_interface(&sg_interface);
1605 if (0 == rc) {
1606#ifdef CONFIG_SCSI_PROC_FS
1607 sg_proc_init();
1608#endif /* CONFIG_SCSI_PROC_FS */
1609 return 0;
1610 }
d253878b 1611 class_destroy(sg_sysfs_class);
1da177e4
LT		 1612err_out:
1613 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1614 return rc;
1615}
1616
1617static void __exit
1618exit_sg(void)
1619{
1620#ifdef CONFIG_SCSI_PROC_FS
1621 sg_proc_cleanup();
1622#endif /* CONFIG_SCSI_PROC_FS */
1623 scsi_unregister_interface(&sg_interface);
d253878b 1624 class_destroy(sg_sysfs_class);
1da177e4
LT		 1625 sg_sysfs_valid = 0;
1626 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1627 SG_MAX_DEVS);
7c07d613 1628 idr_destroy(&sg_index_idr);
1da177e4
LT		 1629}
1630
1631static int
1632sg_start_req(Sg_request * srp)
1633{
1634 int res;
1635 Sg_fd *sfp = srp->parentfp;
1636 sg_io_hdr_t *hp = &srp->header;
1637 int dxfer_len = (int) hp->dxfer_len;
1638 int dxfer_dir = hp->dxfer_direction;
1639 Sg_scatter_hold *req_schp = &srp->data;
1640 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1641
1642 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1643 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1644 return 0;
1645 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1646 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1647 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1648 res = sg_build_direct(srp, sfp, dxfer_len);
1649 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1650 return res;
1651 }
1652 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1653 sg_link_reserve(sfp, srp, dxfer_len);
1654 else {
1655 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1656 if (res) {
1657 sg_remove_scat(req_schp);
1658 return res;
1659 }
1660 }
1661 return 0;
1662}
1663
1664static void
1665sg_finish_rem_req(Sg_request * srp)
1666{
1667 Sg_fd *sfp = srp->parentfp;
1668 Sg_scatter_hold *req_schp = &srp->data;
1669
1670 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1671 if (srp->res_used)
1672 sg_unlink_reserve(sfp, srp);
1673 else
1674 sg_remove_scat(req_schp);
1675 sg_remove_request(sfp, srp);
1676}
1677
1678static int
1679sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1680{
d6b10348 1681 int sg_bufflen = tablesize * sizeof(struct scatterlist);
2d20eaf9 1682 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1683
d6b10348
MC		 1684 /*
1685 * TODO: test without low_dma, we should not need it since
1686 * the block layer will bounce the buffer for us
1687 *
1688 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1689 */
1690 if (sfp->low_dma)
1691 gfp_flags |= GFP_DMA;
1692 schp->buffer = kzalloc(sg_bufflen, gfp_flags);
1da177e4
LT		 1693 if (!schp->buffer)
1694 return -ENOMEM;
30fa0d0f 1695 sg_init_table(schp->buffer, tablesize);
1da177e4 1696 schp->sglist_len = sg_bufflen;
d6b10348 1697 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1698}
1699
1700#ifdef SG_ALLOW_DIO_CODE
1701/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
d6b10348 1702 /* TODO: hopefully we can use the generic block layer code */
1da177e4
LT		 1703
1704/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1705 - mapping of all pages not successful
1da177e4
LT		 1706 (i.e., either completely successful or fails)
1707*/
1708static int
1709st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
d6b10348 1710 unsigned long uaddr, size_t count, int rw)
1da177e4 1711{
deb92b7e
DG		 1712 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1713 unsigned long start = uaddr >> PAGE_SHIFT;
1714 const int nr_pages = end - start;
1da177e4 1715 int res, i, j;
1da177e4
LT		 1716 struct page **pages;
1717
1da177e4
LT		 1718 /* User attempted Overflow! */
1719 if ((uaddr + count) < uaddr)
1720 return -EINVAL;
1721
1722 /* Too big */
1723 if (nr_pages > max_pages)
1724 return -ENOMEM;
1725
1726 /* Hmm? */
1727 if (count == 0)
1728 return 0;
1729
1730 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1731 return -ENOMEM;
1732
1733 /* Try to fault in all of the necessary pages */
1734 down_read(&current->mm->mmap_sem);
1735 /* rw==READ means read from drive, write into memory area */
1736 res = get_user_pages(
1737 current,
1738 current->mm,
1739 uaddr,
1740 nr_pages,
1741 rw == READ,
1742 0, /* don't force */
1743 pages,
1744 NULL);
1745 up_read(&current->mm->mmap_sem);
1746
1747 /* Errors and no page mapped should return here */
1748 if (res < nr_pages)
1749 goto out_unmap;
1750
1751 for (i=0; i < nr_pages; i++) {
1752 /* FIXME: flush superflous for rw==READ,
1753 * probably wrong function for rw==WRITE
1754 */
1755 flush_dcache_page(pages[i]);
1da177e4 1756 /* ?? Is locking needed? I don't think so */
529ae9aa 1757 /* if (!trylock_page(pages[i]))
1da177e4
LT		 1758 goto out_unlock; */
1759 }
1760
642f1490 1761 sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK);
1da177e4
LT		 1762 if (nr_pages > 1) {
1763 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1764 count -= sgl[0].length;
642f1490
JA		 1765 for (i=1; i < nr_pages ; i++)
1766 sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0);
1da177e4
LT		 1767 }
1768 else {
1769 sgl[0].length = count;
1770 }
1771
1772 kfree(pages);
1773 return nr_pages;
1774
1da177e4 1775 out_unmap:
4d5cda06 1776 if (res > 0) {
1da177e4
LT		 1777 for (j=0; j < res; j++)
1778 page_cache_release(pages[j]);
4d5cda06
HD		 1779 res = 0;
1780 }
1da177e4
LT		 1781 kfree(pages);
1782 return res;
1783}
1784
1785
1786/* And unmap them... */
1787static int
1788st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1789 int dirtied)
1790{
1791 int i;
1792
1793 for (i=0; i < nr_pages; i++) {
45711f1a 1794 struct page *page = sg_page(&sgl[i]);
b5810039 1795
b5810039
NP		 1796 if (dirtied)
1797 SetPageDirty(page);
1798 /* unlock_page(page); */
1da177e4
LT		 1799 /* FIXME: cache flush missing for rw==READ
1800 * FIXME: call the correct reference counting function
1801 */
b5810039 1802 page_cache_release(page);
1da177e4
LT		 1803 }
1804
1805 return 0;
1806}
1807
1808/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1809#endif
1810
1811
1812/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1813static int
1814sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1815{
1816#ifdef SG_ALLOW_DIO_CODE
1817 sg_io_hdr_t *hp = &srp->header;
1818 Sg_scatter_hold *schp = &srp->data;
1819 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4
LT		 1820 int mx_sc_elems, res;
1821 struct scsi_device *sdev = sfp->parentdp->device;
1822
1823 if (((unsigned long)hp->dxferp &
1824 queue_dma_alignment(sdev->request_queue)) != 0)
1825 return 1;
d6b10348 1826
1da177e4
LT		 1827 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1828 if (mx_sc_elems <= 0) {
1829 return 1;
1830 }
d6b10348
MC		 1831 res = st_map_user_pages(schp->buffer, mx_sc_elems,
1832 (unsigned long)hp->dxferp, dxfer_len,
1833 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
c06bb7f5
DG		 1834 if (res <= 0) {
1835 sg_remove_scat(schp);
1da177e4 1836 return 1;
c06bb7f5 1837 }
1da177e4
LT		 1838 schp->k_use_sg = res;
1839 schp->dio_in_use = 1;
1840 hp->info |= SG_INFO_DIRECT_IO;
1841 return 0;
1842#else
1843 return 1;
1844#endif
1845}
1846
1847static int
1848sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1849{
d6b10348
MC		 1850 struct scatterlist *sg;
1851 int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
1852 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4 1853 int blk_size = buff_size;
d6b10348 1854 struct page *p = NULL;
1da177e4 1855
fb119935 1856 if (blk_size < 0)
1da177e4
LT		 1857 return -EFAULT;
1858 if (0 == blk_size)
1859 ++blk_size; /* don't know why */
1860/* round request up to next highest SG_SECTOR_SZ byte boundary */
1861 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1862 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1863 buff_size, blk_size));
d6b10348
MC		 1864
1865 /* N.B. ret_sz carried into this block ... */
1866 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1867 if (mx_sc_elems < 0)
1868 return mx_sc_elems; /* most likely -ENOMEM */
1869
6460e75a
DG		 1870 num = scatter_elem_sz;
1871 if (unlikely(num != scatter_elem_sz_prev)) {
1872 if (num < PAGE_SIZE) {
1873 scatter_elem_sz = PAGE_SIZE;
1874 scatter_elem_sz_prev = PAGE_SIZE;
1875 } else
1876 scatter_elem_sz_prev = num;
1877 }
d6b10348
MC		 1878 for (k = 0, sg = schp->buffer, rem_sz = blk_size;
1879 (rem_sz > 0) && (k < mx_sc_elems);
b0f655d0 1880 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {
d6b10348 1881
6460e75a
DG		 1882 num = (rem_sz > scatter_elem_sz_prev) ?
1883 scatter_elem_sz_prev : rem_sz;
d6b10348 1884 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1da177e4
LT		 1885 if (!p)
1886 return -ENOMEM;
d6b10348 1887
6460e75a
DG		 1888 if (num == scatter_elem_sz_prev) {
1889 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1890 scatter_elem_sz = ret_sz;
1891 scatter_elem_sz_prev = ret_sz;
1892 }
1893 }
642f1490 1894 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0);
d6b10348 1895
7ca63cb4
DG		 1896 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1897 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1898 } /* end of for loop */
1899
1900 schp->k_use_sg = k;
7ca63cb4
DG		 1901 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1902 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1903
1904 schp->bufflen = blk_size;
1905 if (rem_sz > 0) /* must have failed */
1906 return -ENOMEM;
1907
1da177e4
LT		 1908 return 0;
1909}
1910
1911static int
1912sg_write_xfer(Sg_request * srp)
1913{
1914 sg_io_hdr_t *hp = &srp->header;
1915 Sg_scatter_hold *schp = &srp->data;
d6b10348 1916 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 1917 int num_xfer = 0;
1918 int j, k, onum, usglen, ksglen, res;
1919 int iovec_count = (int) hp->iovec_count;
1920 int dxfer_dir = hp->dxfer_direction;
1921 unsigned char *p;
1922 unsigned char __user *up;
1923 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1924
1925 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1926 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1927 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1928 if (schp->bufflen < num_xfer)
1929 num_xfer = schp->bufflen;
1930 }
1931 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1932 (new_interface
1933 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1934 return 0;
1935
1936 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1937 num_xfer, iovec_count, schp->k_use_sg));
1938 if (iovec_count) {
1939 onum = iovec_count;
1940 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1941 return -EFAULT;
1942 } else
1943 onum = 1;
1944
d6b10348 1945 ksglen = sg->length;
45711f1a 1946 p = page_address(sg_page(sg));
d6b10348
MC		 1947 for (j = 0, k = 0; j < onum; ++j) {
1948 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1949 if (res)
1950 return res;
1951
b0f655d0 1952 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 1953 p = page_address(sg_page(sg))) {
d6b10348
MC		 1954 if (usglen <= 0)
1955 break;
1956 if (ksglen > usglen) {
1957 if (usglen >= num_xfer) {
1958 if (__copy_from_user(p, up, num_xfer))
1da177e4 1959 return -EFAULT;
d6b10348 1960 return 0;
1da177e4 1961 }
d6b10348
MC		 1962 if (__copy_from_user(p, up, usglen))
1963 return -EFAULT;
1964 p += usglen;
1965 ksglen -= usglen;
1966 break;
1967 } else {
1968 if (ksglen >= num_xfer) {
1969 if (__copy_from_user(p, up, num_xfer))
1970 return -EFAULT;
1da177e4 1971 return 0;
d6b10348
MC		 1972 }
1973 if (__copy_from_user(p, up, ksglen))
1974 return -EFAULT;
1975 up += ksglen;
1976 usglen -= ksglen;
1da177e4 1977 }
d6b10348
MC		 1978 ++k;
1979 if (k >= schp->k_use_sg)
1980 return 0;
1da177e4
LT		 1981 }
1982 }
d6b10348 1983
1da177e4
LT		 1984 return 0;
1985}
1986
1987static int
1988sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1989 int wr_xf, int *countp, unsigned char __user **up)
1990{
1991 int num_xfer = (int) hp->dxfer_len;
1992 unsigned char __user *p = hp->dxferp;
1993 int count;
1994
1995 if (0 == sg_num) {
1996 if (wr_xf && ('\0' == hp->interface_id))
1997 count = (int) hp->flags; /* holds "old" input_size */
1998 else
1999 count = num_xfer;
2000 } else {
2001 sg_iovec_t iovec;
2002 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2003 return -EFAULT;
2004 p = iovec.iov_base;
2005 count = (int) iovec.iov_len;
2006 }
2007 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
2008 return -EFAULT;
2009 if (up)
2010 *up = p;
2011 if (countp)
2012 *countp = count;
2013 return 0;
2014}
2015
2016static void
2017sg_remove_scat(Sg_scatter_hold * schp)
2018{
2019 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2020 if (schp->buffer && (schp->sglist_len > 0)) {
d6b10348 2021 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 2022
2023 if (schp->dio_in_use) {
2024#ifdef SG_ALLOW_DIO_CODE
d6b10348 2025 st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
1da177e4
LT		 2026#endif
2027 } else {
2028 int k;
2029
45711f1a 2030 for (k = 0; (k < schp->k_use_sg) && sg_page(sg);
b0f655d0 2031 ++k, sg = sg_next(sg)) {
1da177e4 2032 SCSI_LOG_TIMEOUT(5, printk(
7ca63cb4 2033 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
45711f1a
JA		 2034 k, sg_page(sg), sg->length));
2035 sg_page_free(sg_page(sg), sg->length);
1da177e4
LT		 2036 }
2037 }
d6b10348
MC		 2038 kfree(schp->buffer);
2039 }
1da177e4
LT		 2040 memset(schp, 0, sizeof (*schp));
2041}
2042
2043static int
2044sg_read_xfer(Sg_request * srp)
2045{
2046 sg_io_hdr_t *hp = &srp->header;
2047 Sg_scatter_hold *schp = &srp->data;
d6b10348 2048 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 2049 int num_xfer = 0;
2050 int j, k, onum, usglen, ksglen, res;
2051 int iovec_count = (int) hp->iovec_count;
2052 int dxfer_dir = hp->dxfer_direction;
2053 unsigned char *p;
2054 unsigned char __user *up;
2055 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2056
2057 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2058 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2059 num_xfer = hp->dxfer_len;
2060 if (schp->bufflen < num_xfer)
2061 num_xfer = schp->bufflen;
2062 }
2063 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2064 (new_interface
2065 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2066 return 0;
2067
2068 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2069 num_xfer, iovec_count, schp->k_use_sg));
2070 if (iovec_count) {
2071 onum = iovec_count;
2072 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2073 return -EFAULT;
2074 } else
2075 onum = 1;
2076
45711f1a 2077 p = page_address(sg_page(sg));
d6b10348
MC		 2078 ksglen = sg->length;
2079 for (j = 0, k = 0; j < onum; ++j) {
2080 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2081 if (res)
2082 return res;
2083
b0f655d0 2084 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 2085 p = page_address(sg_page(sg))) {
d6b10348
MC		 2086 if (usglen <= 0)
2087 break;
2088 if (ksglen > usglen) {
2089 if (usglen >= num_xfer) {
2090 if (__copy_to_user(up, p, num_xfer))
1da177e4 2091 return -EFAULT;
d6b10348 2092 return 0;
1da177e4 2093 }
d6b10348
MC		 2094 if (__copy_to_user(up, p, usglen))
2095 return -EFAULT;
2096 p += usglen;
2097 ksglen -= usglen;
2098 break;
2099 } else {
2100 if (ksglen >= num_xfer) {
2101 if (__copy_to_user(up, p, num_xfer))
2102 return -EFAULT;
1da177e4 2103 return 0;
d6b10348
MC		 2104 }
2105 if (__copy_to_user(up, p, ksglen))
2106 return -EFAULT;
2107 up += ksglen;
2108 usglen -= ksglen;
1da177e4 2109 }
d6b10348
MC		 2110 ++k;
2111 if (k >= schp->k_use_sg)
2112 return 0;
1da177e4
LT		 2113 }
2114 }
d6b10348 2115
1da177e4
LT		 2116 return 0;
2117}
2118
2119static int
2120sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2121{
2122 Sg_scatter_hold *schp = &srp->data;
d6b10348
MC		 2123 struct scatterlist *sg = schp->buffer;
2124 int k, num;
1da177e4
LT		 2125
2126 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2127 num_read_xfer));
2128 if ((!outp) || (num_read_xfer <= 0))
2129 return 0;
d6b10348 2130
45711f1a 2131 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) {
d6b10348
MC		 2132 num = sg->length;
2133 if (num > num_read_xfer) {
45711f1a 2134 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2135 num_read_xfer))
2136 return -EFAULT;
2137 break;
2138 } else {
45711f1a 2139 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2140 num))
2141 return -EFAULT;
2142 num_read_xfer -= num;
2143 if (num_read_xfer <= 0)
1da177e4 2144 break;
d6b10348 2145 outp += num;
1da177e4 2146 }
1da177e4 2147 }
d6b10348 2148
1da177e4
LT		 2149 return 0;
2150}
2151
2152static void
2153sg_build_reserve(Sg_fd * sfp, int req_size)
2154{
2155 Sg_scatter_hold *schp = &sfp->reserve;
2156
2157 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2158 do {
2159 if (req_size < PAGE_SIZE)
2160 req_size = PAGE_SIZE;
2161 if (0 == sg_build_indirect(schp, sfp, req_size))
2162 return;
2163 else
2164 sg_remove_scat(schp);
2165 req_size >>= 1; /* divide by 2 */
2166 } while (req_size > (PAGE_SIZE / 2));
2167}
2168
2169static void
2170sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2171{
2172 Sg_scatter_hold *req_schp = &srp->data;
2173 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348
MC		 2174 struct scatterlist *sg = rsv_schp->buffer;
2175 int k, num, rem;
1da177e4
LT		 2176
2177 srp->res_used = 1;
2178 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 2179 rem = size;
d6b10348 2180
b0f655d0 2181 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
d6b10348
MC		 2182 num = sg->length;
2183 if (rem <= num) {
2184 sfp->save_scat_len = num;
2185 sg->length = rem;
2186 req_schp->k_use_sg = k + 1;
2187 req_schp->sglist_len = rsv_schp->sglist_len;
2188 req_schp->buffer = rsv_schp->buffer;
2189
2190 req_schp->bufflen = size;
2191 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2192 break;
2193 } else
2194 rem -= num;
1da177e4 2195 }
d6b10348
MC		 2196
2197 if (k >= rsv_schp->k_use_sg)
2198 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 2199}
2200
2201static void
2202sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2203{
2204 Sg_scatter_hold *req_schp = &srp->data;
2205 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2206
2207 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2208 (int) req_schp->k_use_sg));
2209 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
d6b10348 2210 struct scatterlist *sg = rsv_schp->buffer;
1da177e4
LT		 2211
2212 if (sfp->save_scat_len > 0)
d6b10348 2213 (sg + (req_schp->k_use_sg - 1))->length =
1da177e4
LT		 2214 (unsigned) sfp->save_scat_len;
2215 else
2216 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2217 }
2218 req_schp->k_use_sg = 0;
2219 req_schp->bufflen = 0;
2220 req_schp->buffer = NULL;
2221 req_schp->sglist_len = 0;
2222 sfp->save_scat_len = 0;
2223 srp->res_used = 0;
2224}
2225
2226static Sg_request *
2227sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2228{
2229 Sg_request *resp;
2230 unsigned long iflags;
2231
2232 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2233 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2234 /* look for requests that are ready + not SG_IO owned */
2235 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2236 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2237 resp->done = 2; /* guard against other readers */
2238 break;
2239 }
2240 }
2241 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2242 return resp;
2243}
2244
2245#ifdef CONFIG_SCSI_PROC_FS
2246static Sg_request *
2247sg_get_nth_request(Sg_fd * sfp, int nth)
2248{
2249 Sg_request *resp;
2250 unsigned long iflags;
2251 int k;
2252
2253 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2254 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2255 ++k, resp = resp->nextrp) ;
2256 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2257 return resp;
2258}
2259#endif
2260
2261/* always adds to end of list */
2262static Sg_request *
2263sg_add_request(Sg_fd * sfp)
2264{
2265 int k;
2266 unsigned long iflags;
2267 Sg_request *resp;
2268 Sg_request *rp = sfp->req_arr;
2269
2270 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2271 resp = sfp->headrp;
2272 if (!resp) {
2273 memset(rp, 0, sizeof (Sg_request));
2274 rp->parentfp = sfp;
2275 resp = rp;
2276 sfp->headrp = resp;
2277 } else {
2278 if (0 == sfp->cmd_q)
2279 resp = NULL; /* command queuing disallowed */
2280 else {
2281 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2282 if (!rp->parentfp)
2283 break;
2284 }
2285 if (k < SG_MAX_QUEUE) {
2286 memset(rp, 0, sizeof (Sg_request));
2287 rp->parentfp = sfp;
2288 while (resp->nextrp)
2289 resp = resp->nextrp;
2290 resp->nextrp = rp;
2291 resp = rp;
2292 } else
2293 resp = NULL;
2294 }
2295 }
2296 if (resp) {
2297 resp->nextrp = NULL;
cb59e840 2298 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2299 }
2300 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2301 return resp;
2302}
2303
2304/* Return of 1 for found; 0 for not found */
2305static int
2306sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2307{
2308 Sg_request *prev_rp;
2309 Sg_request *rp;
2310 unsigned long iflags;
2311 int res = 0;
2312
2313 if ((!sfp) || (!srp) || (!sfp->headrp))
2314 return res;
2315 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2316 prev_rp = sfp->headrp;
2317 if (srp == prev_rp) {
2318 sfp->headrp = prev_rp->nextrp;
2319 prev_rp->parentfp = NULL;
2320 res = 1;
2321 } else {
2322 while ((rp = prev_rp->nextrp)) {
2323 if (srp == rp) {
2324 prev_rp->nextrp = rp->nextrp;
2325 rp->parentfp = NULL;
2326 res = 1;
2327 break;
2328 }
2329 prev_rp = rp;
2330 }
2331 }
2332 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2333 return res;
2334}
2335
2336#ifdef CONFIG_SCSI_PROC_FS
2337static Sg_fd *
2338sg_get_nth_sfp(Sg_device * sdp, int nth)
2339{
2340 Sg_fd *resp;
2341 unsigned long iflags;
2342 int k;
2343
7c07d613 2344 read_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2345 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2346 ++k, resp = resp->nextfp) ;
7c07d613 2347 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2348 return resp;
2349}
2350#endif
2351
2352static Sg_fd *
2353sg_add_sfp(Sg_device * sdp, int dev)
2354{
2355 Sg_fd *sfp;
2356 unsigned long iflags;
44ec9542 2357 int bufflen;
1da177e4 2358
d6b10348 2359 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2360 if (!sfp)
2361 return NULL;
d6b10348 2362
1da177e4
LT		 2363 init_waitqueue_head(&sfp->read_wait);
2364 rwlock_init(&sfp->rq_list_lock);
2365
2366 sfp->timeout = SG_DEFAULT_TIMEOUT;
2367 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2368 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2369 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2370 sdp->device->host->unchecked_isa_dma : 1;
2371 sfp->cmd_q = SG_DEF_COMMAND_Q;
2372 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2373 sfp->parentdp = sdp;
7c07d613 2374 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2375 if (!sdp->headfp)
2376 sdp->headfp = sfp;
2377 else { /* add to tail of existing list */
2378 Sg_fd *pfp = sdp->headfp;
2379 while (pfp->nextfp)
2380 pfp = pfp->nextfp;
2381 pfp->nextfp = sfp;
2382 }
7c07d613 2383 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2384 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2385 if (unlikely(sg_big_buff != def_reserved_size))
2386 sg_big_buff = def_reserved_size;
2387
44ec9542
AS		 2388 bufflen = min_t(int, sg_big_buff,
2389 sdp->device->request_queue->max_sectors * 512);
2390 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2391 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2392 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2393 return sfp;
2394}
2395
2396static void
2397__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2398{
2399 Sg_fd *fp;
2400 Sg_fd *prev_fp;
2401
2402 prev_fp = sdp->headfp;
2403 if (sfp == prev_fp)
2404 sdp->headfp = prev_fp->nextfp;
2405 else {
2406 while ((fp = prev_fp->nextfp)) {
2407 if (sfp == fp) {
2408 prev_fp->nextfp = fp->nextfp;
2409 break;
2410 }
2411 prev_fp = fp;
2412 }
2413 }
2414 if (sfp->reserve.bufflen > 0) {
2415 SCSI_LOG_TIMEOUT(6,
2416 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2417 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2418 sg_remove_scat(&sfp->reserve);
2419 }
2420 sfp->parentdp = NULL;
2421 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2422 kfree(sfp);
1da177e4
LT		 2423}
2424
2425/* Returns 0 in normal case, 1 when detached and sdp object removed */
2426static int
2427sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2428{
2429 Sg_request *srp;
2430 Sg_request *tsrp;
2431 int dirty = 0;
2432 int res = 0;
2433
2434 for (srp = sfp->headrp; srp; srp = tsrp) {
2435 tsrp = srp->nextrp;
2436 if (sg_srp_done(srp, sfp))
2437 sg_finish_rem_req(srp);
2438 else
2439 ++dirty;
2440 }
2441 if (0 == dirty) {
2442 unsigned long iflags;
2443
7c07d613 2444 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2445 __sg_remove_sfp(sdp, sfp);
2446 if (sdp->detached && (NULL == sdp->headfp)) {
7c07d613
JB		 2447 idr_remove(&sg_index_idr, sdp->index);
2448 kfree(sdp);
1da177e4
LT		 2449 res = 1;
2450 }
7c07d613 2451 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2452 } else {
2453 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2454 /* only bump the access_count if we actually succeeded in
2455 * throwing another counter on the host module */
2456 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2457 sfp->closed = 1; /* flag dirty state on this fd */
2458 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2459 dirty));
2460 }
2461 return res;
2462}
2463
2464static int
2465sg_res_in_use(Sg_fd * sfp)
2466{
2467 const Sg_request *srp;
2468 unsigned long iflags;
2469
2470 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2471 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2472 if (srp->res_used)
2473 break;
2474 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2475 return srp ? 1 : 0;
2476}
2477
6460e75a 2478/* The size fetched (value output via retSzp) set when non-NULL return */
d6b10348 2479static struct page *
1da177e4
LT		 2480sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2481{
d6b10348 2482 struct page *resp = NULL;
c53033f6 2483 gfp_t page_mask;
1da177e4 2484 int order, a_size;
6460e75a 2485 int resSz;
1da177e4 2486
6460e75a 2487 if ((rqSz <= 0) || (NULL == retSzp))
1da177e4
LT		 2488 return resp;
2489
2490 if (lowDma)
f9aed0e2 2491 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
1da177e4 2492 else
f9aed0e2 2493 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4
LT		 2494
2495 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2496 order++, a_size <<= 1) ;
6460e75a 2497 resSz = a_size; /* rounded up if necessary */
d6b10348 2498 resp = alloc_pages(page_mask, order);
6460e75a 2499 while ((!resp) && order) {
1da177e4
LT		 2500 --order;
2501 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
d6b10348 2502 resp = alloc_pages(page_mask, order); /* try half */
1da177e4
LT		 2503 resSz = a_size;
2504 }
2505 if (resp) {
2506 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
41ed16fa 2507 memset(page_address(resp), 0, resSz);
6460e75a 2508 *retSzp = resSz;
1da177e4
LT		 2509 }
2510 return resp;
2511}
2512
2513static void
d6b10348 2514sg_page_free(struct page *page, int size)
1da177e4
LT		 2515{
2516 int order, a_size;
2517
d6b10348 2518 if (!page)
1da177e4
LT		 2519 return;
2520 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2521 order++, a_size <<= 1) ;
d6b10348 2522 __free_pages(page, order);
1da177e4
LT		 2523}
2524
1da177e4 2525#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2526static int
2527sg_idr_max_id(int id, void *p, void *data)
2528{
2529 int *k = data;
2530
2531 if (*k < id)
2532 *k = id;
2533
2534 return 0;
2535}
2536
1da177e4
LT		 2537static int
2538sg_last_dev(void)
2539{
53474c04 2540 int k = -1;
1da177e4
LT		 2541 unsigned long iflags;
2542
7c07d613
JB		 2543 read_lock_irqsave(&sg_index_lock, iflags);
2544 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2545 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2546 return k + 1; /* origin 1 */
2547}
2548#endif
2549
2550static Sg_device *
2551sg_get_dev(int dev)
2552{
7c07d613 2553 Sg_device *sdp;
1da177e4
LT		 2554 unsigned long iflags;
2555
7c07d613
JB		 2556 read_lock_irqsave(&sg_index_lock, iflags);
2557 sdp = idr_find(&sg_index_idr, dev);
2558 read_unlock_irqrestore(&sg_index_lock, iflags);
2559
1da177e4
LT		 2560 return sdp;
2561}
2562
2563#ifdef CONFIG_SCSI_PROC_FS
2564
2565static struct proc_dir_entry *sg_proc_sgp = NULL;
2566
2567static char sg_proc_sg_dirname[] = "scsi/sg";
2568
2569static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2570
2571static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2572static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2573 size_t count, loff_t *off);
2574static struct file_operations adio_fops = {
2575 /* .owner, .read and .llseek added in sg_proc_init() */
2576 .open = sg_proc_single_open_adio,
2577 .write = sg_proc_write_adio,
2578 .release = single_release,
2579};
2580
2581static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2582static ssize_t sg_proc_write_dressz(struct file *filp,
2583 const char __user *buffer, size_t count, loff_t *off);
2584static struct file_operations dressz_fops = {
2585 .open = sg_proc_single_open_dressz,
2586 .write = sg_proc_write_dressz,
2587 .release = single_release,
2588};
2589
2590static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2591static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2592static struct file_operations version_fops = {
2593 .open = sg_proc_single_open_version,
2594 .release = single_release,
2595};
2596
2597static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2598static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2599static struct file_operations devhdr_fops = {
2600 .open = sg_proc_single_open_devhdr,
2601 .release = single_release,
2602};
2603
2604static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2605static int sg_proc_open_dev(struct inode *inode, struct file *file);
2606static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2607static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2608static void dev_seq_stop(struct seq_file *s, void *v);
2609static struct file_operations dev_fops = {
2610 .open = sg_proc_open_dev,
2611 .release = seq_release,
2612};
2613static struct seq_operations dev_seq_ops = {
2614 .start = dev_seq_start,
2615 .next = dev_seq_next,
2616 .stop = dev_seq_stop,
2617 .show = sg_proc_seq_show_dev,
2618};
2619
2620static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2621static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2622static struct file_operations devstrs_fops = {
2623 .open = sg_proc_open_devstrs,
2624 .release = seq_release,
2625};
2626static struct seq_operations devstrs_seq_ops = {
2627 .start = dev_seq_start,
2628 .next = dev_seq_next,
2629 .stop = dev_seq_stop,
2630 .show = sg_proc_seq_show_devstrs,
2631};
2632
2633static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2634static int sg_proc_open_debug(struct inode *inode, struct file *file);
2635static struct file_operations debug_fops = {
2636 .open = sg_proc_open_debug,
2637 .release = seq_release,
2638};
2639static struct seq_operations debug_seq_ops = {
2640 .start = dev_seq_start,
2641 .next = dev_seq_next,
2642 .stop = dev_seq_stop,
2643 .show = sg_proc_seq_show_debug,
2644};
2645
2646
2647struct sg_proc_leaf {
2648 const char * name;
2649 struct file_operations * fops;
2650};
2651
2652static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2653 {"allow_dio", &adio_fops},
2654 {"debug", &debug_fops},
2655 {"def_reserved_size", &dressz_fops},
2656 {"device_hdr", &devhdr_fops},
2657 {"devices", &dev_fops},
2658 {"device_strs", &devstrs_fops},
2659 {"version", &version_fops}
2660};
2661
2662static int
2663sg_proc_init(void)
2664{
2665 int k, mask;
6391a113 2666 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2667 struct sg_proc_leaf * leaf;
2668
66600221 2669 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2670 if (!sg_proc_sgp)
2671 return 1;
2672 for (k = 0; k < num_leaves; ++k) {
2673 leaf = &sg_proc_leaf_arr[k];
2674 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f
DL		 2675 leaf->fops->owner = THIS_MODULE;
2676 leaf->fops->read = seq_read;
2677 leaf->fops->llseek = seq_lseek;
2678 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2679 }
2680 return 0;
2681}
2682
2683static void
2684sg_proc_cleanup(void)
2685{
2686 int k;
6391a113 2687 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2688
2689 if (!sg_proc_sgp)
2690 return;
2691 for (k = 0; k < num_leaves; ++k)
2692 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2693 remove_proc_entry(sg_proc_sg_dirname, NULL);
2694}
2695
2696
2697static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2698{
2699 seq_printf(s, "%d\n", *((int *)s->private));
2700 return 0;
2701}
2702
2703static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2704{
2705 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2706}
2707
2708static ssize_t
2709sg_proc_write_adio(struct file *filp, const char __user *buffer,
2710 size_t count, loff_t *off)
2711{
2712 int num;
2713 char buff[11];
2714
2715 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2716 return -EACCES;
2717 num = (count < 10) ? count : 10;
2718 if (copy_from_user(buff, buffer, num))
2719 return -EFAULT;
2720 buff[num] = '\0';
2721 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2722 return count;
2723}
2724
2725static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2726{
2727 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2728}
2729
2730static ssize_t
2731sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2732 size_t count, loff_t *off)
2733{
2734 int num;
2735 unsigned long k = ULONG_MAX;
2736 char buff[11];
2737
2738 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2739 return -EACCES;
2740 num = (count < 10) ? count : 10;
2741 if (copy_from_user(buff, buffer, num))
2742 return -EFAULT;
2743 buff[num] = '\0';
2744 k = simple_strtoul(buff, NULL, 10);
2745 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2746 sg_big_buff = k;
2747 return count;
2748 }
2749 return -ERANGE;
2750}
2751
2752static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2753{
2754 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2755 sg_version_date);
2756 return 0;
2757}
2758
2759static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2760{
2761 return single_open(file, sg_proc_seq_show_version, NULL);
2762}
2763
2764static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2765{
2766 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2767 "online\n");
2768 return 0;
2769}
2770
2771static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2772{
2773 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2774}
2775
2776struct sg_proc_deviter {
2777 loff_t index;
2778 size_t max;
2779};
2780
2781static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2782{
2783 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2784
729d70f5 2785 s->private = it;
1da177e4
LT		 2786 if (! it)
2787 return NULL;
729d70f5 2788
1da177e4
LT		 2789 it->index = *pos;
2790 it->max = sg_last_dev();
2791 if (it->index >= it->max)
729d70f5 2792 return NULL;
1da177e4 2793 return it;
1da177e4
LT		 2794}
2795
2796static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2797{
729d70f5 2798 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2799
2800 *pos = ++it->index;
2801 return (it->index < it->max) ? it : NULL;
2802}
2803
2804static void dev_seq_stop(struct seq_file *s, void *v)
2805{
729d70f5 2806 kfree(s->private);
1da177e4
LT		 2807}
2808
2809static int sg_proc_open_dev(struct inode *inode, struct file *file)
2810{
2811 return seq_open(file, &dev_seq_ops);
2812}
2813
2814static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2815{
2816 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2817 Sg_device *sdp;
2818 struct scsi_device *scsidp;
2819
2820 sdp = it ? sg_get_dev(it->index) : NULL;
2821 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2822 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2823 scsidp->host->host_no, scsidp->channel,
2824 scsidp->id, scsidp->lun, (int) scsidp->type,
2825 1,
2826 (int) scsidp->queue_depth,
2827 (int) scsidp->device_busy,
2828 (int) scsi_device_online(scsidp));
2829 else
2830 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2831 return 0;
2832}
2833
2834static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2835{
2836 return seq_open(file, &devstrs_seq_ops);
2837}
2838
2839static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2840{
2841 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2842 Sg_device *sdp;
2843 struct scsi_device *scsidp;
2844
2845 sdp = it ? sg_get_dev(it->index) : NULL;
2846 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2847 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2848 scsidp->vendor, scsidp->model, scsidp->rev);
2849 else
2850 seq_printf(s, "<no active device>\n");
2851 return 0;
2852}
2853
2854static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2855{
2856 int k, m, new_interface, blen, usg;
2857 Sg_request *srp;
2858 Sg_fd *fp;
2859 const sg_io_hdr_t *hp;
2860 const char * cp;
cb59e840 2861 unsigned int ms;
1da177e4
LT		 2862
2863 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2864 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2865 "(res)sgat=%d low_dma=%d\n", k + 1,
2866 jiffies_to_msecs(fp->timeout),
2867 fp->reserve.bufflen,
2868 (int) fp->reserve.k_use_sg,
2869 (int) fp->low_dma);
2870 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2871 (int) fp->cmd_q, (int) fp->force_packid,
2872 (int) fp->keep_orphan, (int) fp->closed);
2873 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2874 hp = &srp->header;
2875 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2876 if (srp->res_used) {
2877 if (new_interface &&
2878 (SG_FLAG_MMAP_IO & hp->flags))
2879 cp = " mmap>> ";
2880 else
2881 cp = " rb>> ";
2882 } else {
2883 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2884 cp = " dio>> ";
2885 else
2886 cp = " ";
2887 }
2888 seq_printf(s, cp);
d6b10348
MC		 2889 blen = srp->data.bufflen;
2890 usg = srp->data.k_use_sg;
1da177e4
LT		 2891 seq_printf(s, srp->done ?
2892 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2893 : "act:");
1da177e4
LT		 2894 seq_printf(s, " id=%d blen=%d",
2895 srp->header.pack_id, blen);
2896 if (srp->done)
2897 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2898 else {
2899 ms = jiffies_to_msecs(jiffies);
1da177e4 2900 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2901 (new_interface ? hp->timeout :
2902 jiffies_to_msecs(fp->timeout)),
2903 (ms > hp->duration ? ms - hp->duration : 0));
2904 }
1da177e4
LT		 2905 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2906 (int) srp->data.cmd_opcode);
2907 }
2908 if (0 == m)
2909 seq_printf(s, " No requests active\n");
2910 }
2911}
2912
2913static int sg_proc_open_debug(struct inode *inode, struct file *file)
2914{
2915 return seq_open(file, &debug_seq_ops);
2916}
2917
2918static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2919{
2920 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2921 Sg_device *sdp;
2922
2923 if (it && (0 == it->index)) {
7c07d613
JB		 2924 seq_printf(s, "max_active_device=%d(origin 1)\n",
2925 (int)it->max);
1da177e4
LT		 2926 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2927 }
2928 sdp = it ? sg_get_dev(it->index) : NULL;
2929 if (sdp) {
2930 struct scsi_device *scsidp = sdp->device;
2931
2932 if (NULL == scsidp) {
2933 seq_printf(s, "device %d detached ??\n",
2934 (int)it->index);
2935 return 0;
2936 }
2937
2938 if (sg_get_nth_sfp(sdp, 0)) {
2939 seq_printf(s, " >>> device=%s ",
2940 sdp->disk->disk_name);
2941 if (sdp->detached)
2942 seq_printf(s, "detached pending close ");
2943 else
2944 seq_printf
2945 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2946 scsidp->host->host_no,
2947 scsidp->channel, scsidp->id,
2948 scsidp->lun,
2949 scsidp->host->hostt->emulated);
2950 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2951 sdp->sg_tablesize, sdp->exclude);
2952 }
2953 sg_proc_debug_helper(s, sdp);
2954 }
2955 return 0;
2956}
2957
2958#endif /* CONFIG_SCSI_PROC_FS */
2959
2960module_init(init_sg);
2961module_exit(exit_sg);
kernel source for telekom puls (alcatel/mediatek)