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sg: convert the non-data path to use the block layer
[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 */
10865dfa 140 struct request *rq;
1da177e4
LT		 141} Sg_request;
142
143typedef struct sg_fd { /* holds the state of a file descriptor */
144 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
145 struct sg_device *parentdp; /* owning device */
146 wait_queue_head_t read_wait; /* queue read until command done */
147 rwlock_t rq_list_lock; /* protect access to list in req_arr */
148 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
149 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
150 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
151 unsigned save_scat_len; /* original length of trunc. scat. element */
152 Sg_request *headrp; /* head of request slist, NULL->empty */
153 struct fasync_struct *async_qp; /* used by asynchronous notification */
154 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
155 char low_dma; /* as in parent but possibly overridden to 1 */
156 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
157 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
158 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
159 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
160 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
161 char mmap_called; /* 0 -> mmap() never called on this fd */
162} Sg_fd;
163
164typedef struct sg_device { /* holds the state of each scsi generic device */
165 struct scsi_device *device;
166 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
167 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 168 u32 index; /* device index number */
1da177e4
LT		 169 Sg_fd *headfp; /* first open fd belonging to this device */
170 volatile char detached; /* 0->attached, 1->detached pending removal */
171 volatile char exclude; /* opened for exclusive access */
172 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
173 struct gendisk *disk;
174 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
175} Sg_device;
176
177static int sg_fasync(int fd, struct file *filp, int mode);
d6b10348
MC		 178/* tasklet or soft irq callback */
179static void sg_cmd_done(void *data, char *sense, int result, int resid);
10865dfa 180static int sg_start_req(Sg_request *srp, unsigned char *cmd);
1da177e4
LT		 181static void sg_finish_rem_req(Sg_request * srp);
182static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
183static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
184 int tablesize);
185static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
186 Sg_request * srp);
0b07de85
AG		 187static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
188 const char __user *buf, size_t count, int blocking,
189 int read_only, Sg_request **o_srp);
1da177e4
LT		 190static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
191 unsigned char *cmnd, int timeout, int blocking);
192static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
193 int wr_xf, int *countp, unsigned char __user **up);
194static int sg_write_xfer(Sg_request * srp);
195static int sg_read_xfer(Sg_request * srp);
196static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
197static void sg_remove_scat(Sg_scatter_hold * schp);
198static void sg_build_reserve(Sg_fd * sfp, int req_size);
199static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
200static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
d6b10348
MC		 201static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
202static void sg_page_free(struct page *page, int size);
1da177e4
LT		 203static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
204static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
205static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
206static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
207static Sg_request *sg_add_request(Sg_fd * sfp);
208static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
209static int sg_res_in_use(Sg_fd * sfp);
1da177e4
LT		 210static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
211static Sg_device *sg_get_dev(int dev);
1da177e4
LT		 212#ifdef CONFIG_SCSI_PROC_FS
213static int sg_last_dev(void);
214#endif
215
1da177e4
LT		 216#define SZ_SG_HEADER sizeof(struct sg_header)
217#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
218#define SZ_SG_IOVEC sizeof(sg_iovec_t)
219#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
220
14e507b8
FT		 221static int sg_allow_access(struct file *filp, unsigned char *cmd)
222{
223 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
224 struct request_queue *q = sfp->parentdp->device->request_queue;
225
226 if (sfp->parentdp->device->type == TYPE_SCANNER)
227 return 0;
228
229 return blk_verify_command(&q->cmd_filter,
230 cmd, filp->f_mode & FMODE_WRITE);
231}
232
10865dfa
FT		 233static void sg_rq_end_io(struct request *rq, int uptodate)
234{
235 sg_cmd_done(rq->end_io_data, rq->sense, rq->errors, rq->data_len);
236}
237
1da177e4
LT		 238static int
239sg_open(struct inode *inode, struct file *filp)
240{
241 int dev = iminor(inode);
242 int flags = filp->f_flags;
d6b10348 243 struct request_queue *q;
1da177e4
LT		 244 Sg_device *sdp;
245 Sg_fd *sfp;
246 int res;
247 int retval;
248
eb09d3d4 249 lock_kernel();
1da177e4
LT		 250 nonseekable_open(inode, filp);
251 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
252 sdp = sg_get_dev(dev);
eb09d3d4
JC		 253 if ((!sdp) || (!sdp->device)) {
254 unlock_kernel();
1da177e4 255 return -ENXIO;
eb09d3d4
JC		 256 }
257 if (sdp->detached) {
258 unlock_kernel();
1da177e4 259 return -ENODEV;
eb09d3d4 260 }
1da177e4
LT		 261
262 /* This driver's module count bumped by fops_get in <linux/fs.h> */
263 /* Prevent the device driver from vanishing while we sleep */
264 retval = scsi_device_get(sdp->device);
eb09d3d4
JC		 265 if (retval) {
266 unlock_kernel();
1da177e4 267 return retval;
eb09d3d4 268 }
1da177e4
LT		 269
270 if (!((flags & O_NONBLOCK) ||
271 scsi_block_when_processing_errors(sdp->device))) {
272 retval = -ENXIO;
273 /* we are in error recovery for this device */
274 goto error_out;
275 }
276
277 if (flags & O_EXCL) {
278 if (O_RDONLY == (flags & O_ACCMODE)) {
279 retval = -EPERM; /* Can't lock it with read only access */
280 goto error_out;
281 }
282 if (sdp->headfp && (flags & O_NONBLOCK)) {
283 retval = -EBUSY;
284 goto error_out;
285 }
286 res = 0;
287 __wait_event_interruptible(sdp->o_excl_wait,
288 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
289 if (res) {
290 retval = res; /* -ERESTARTSYS because signal hit process */
291 goto error_out;
292 }
293 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
294 if (flags & O_NONBLOCK) {
295 retval = -EBUSY;
296 goto error_out;
297 }
298 res = 0;
299 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
300 res);
301 if (res) {
302 retval = res; /* -ERESTARTSYS because signal hit process */
303 goto error_out;
304 }
305 }
306 if (sdp->detached) {
307 retval = -ENODEV;
308 goto error_out;
309 }
310 if (!sdp->headfp) { /* no existing opens on this device */
311 sdp->sgdebug = 0;
d6b10348
MC		 312 q = sdp->device->request_queue;
313 sdp->sg_tablesize = min(q->max_hw_segments,
314 q->max_phys_segments);
1da177e4
LT		 315 }
316 if ((sfp = sg_add_sfp(sdp, dev)))
317 filp->private_data = sfp;
318 else {
319 if (flags & O_EXCL)
320 sdp->exclude = 0; /* undo if error */
321 retval = -ENOMEM;
322 goto error_out;
323 }
eb09d3d4 324 unlock_kernel();
1da177e4
LT		 325 return 0;
326
327 error_out:
328 scsi_device_put(sdp->device);
eb09d3d4 329 unlock_kernel();
1da177e4
LT		 330 return retval;
331}
332
333/* Following function was formerly called 'sg_close' */
334static int
335sg_release(struct inode *inode, struct file *filp)
336{
337 Sg_device *sdp;
338 Sg_fd *sfp;
339
340 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
341 return -ENXIO;
342 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
343 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
344 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
345 if (!sdp->detached) {
346 scsi_device_put(sdp->device);
347 }
348 sdp->exclude = 0;
349 wake_up_interruptible(&sdp->o_excl_wait);
350 }
351 return 0;
352}
353
354static ssize_t
355sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
356{
1da177e4
LT		 357 Sg_device *sdp;
358 Sg_fd *sfp;
359 Sg_request *srp;
360 int req_pack_id = -1;
1da177e4 361 sg_io_hdr_t *hp;
cb59e840
DG		 362 struct sg_header *old_hdr = NULL;
363 int retval = 0;
1da177e4
LT		 364
365 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
366 return -ENXIO;
367 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
368 sdp->disk->disk_name, (int) count));
d6b10348 369
1da177e4
LT		 370 if (!access_ok(VERIFY_WRITE, buf, count))
371 return -EFAULT;
372 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 373 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
374 if (!old_hdr)
375 return -ENOMEM;
376 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
377 retval = -EFAULT;
378 goto free_old_hdr;
379 }
380 if (old_hdr->reply_len < 0) {
1da177e4 381 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 382 sg_io_hdr_t *new_hdr;
383 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
384 if (!new_hdr) {
385 retval = -ENOMEM;
386 goto free_old_hdr;
387 }
388 retval =__copy_from_user
389 (new_hdr, buf, SZ_SG_IO_HDR);
390 req_pack_id = new_hdr->pack_id;
391 kfree(new_hdr);
392 if (retval) {
393 retval = -EFAULT;
394 goto free_old_hdr;
395 }
1da177e4
LT		 396 }
397 } else
cb59e840 398 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 399 }
400 srp = sg_get_rq_mark(sfp, req_pack_id);
401 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 402 if (sdp->detached) {
403 retval = -ENODEV;
404 goto free_old_hdr;
405 }
406 if (filp->f_flags & O_NONBLOCK) {
407 retval = -EAGAIN;
408 goto free_old_hdr;
409 }
1da177e4 410 while (1) {
cb59e840 411 retval = 0; /* following macro beats race condition */
1da177e4 412 __wait_event_interruptible(sfp->read_wait,
cb59e840
DG		 413 (sdp->detached ||
414 (srp = sg_get_rq_mark(sfp, req_pack_id))),
415 retval);
416 if (sdp->detached) {
417 retval = -ENODEV;
418 goto free_old_hdr;
419 }
420 if (0 == retval)
1da177e4 421 break;
cb59e840
DG		 422
423 /* -ERESTARTSYS as signal hit process */
424 goto free_old_hdr;
1da177e4
LT		 425 }
426 }
cb59e840
DG		 427 if (srp->header.interface_id != '\0') {
428 retval = sg_new_read(sfp, buf, count, srp);
429 goto free_old_hdr;
430 }
1da177e4
LT		 431
432 hp = &srp->header;
cb59e840
DG		 433 if (old_hdr == NULL) {
434 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
435 if (! old_hdr) {
436 retval = -ENOMEM;
437 goto free_old_hdr;
438 }
439 }
440 memset(old_hdr, 0, SZ_SG_HEADER);
441 old_hdr->reply_len = (int) hp->timeout;
442 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
443 old_hdr->pack_id = hp->pack_id;
444 old_hdr->twelve_byte =
1da177e4 445 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 446 old_hdr->target_status = hp->masked_status;
447 old_hdr->host_status = hp->host_status;
448 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 449 if ((CHECK_CONDITION & hp->masked_status) ||
450 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 451 memcpy(old_hdr->sense_buffer, srp->sense_b,
452 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 453 switch (hp->host_status) {
454 /* This setup of 'result' is for backward compatibility and is best
455 ignored by the user who should use target, host + driver status */
456 case DID_OK:
457 case DID_PASSTHROUGH:
458 case DID_SOFT_ERROR:
cb59e840 459 old_hdr->result = 0;
1da177e4
LT		 460 break;
461 case DID_NO_CONNECT:
462 case DID_BUS_BUSY:
463 case DID_TIME_OUT:
cb59e840 464 old_hdr->result = EBUSY;
1da177e4
LT		 465 break;
466 case DID_BAD_TARGET:
467 case DID_ABORT:
468 case DID_PARITY:
469 case DID_RESET:
470 case DID_BAD_INTR:
cb59e840 471 old_hdr->result = EIO;
1da177e4
LT		 472 break;
473 case DID_ERROR:
cb59e840 474 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 475 hp->masked_status == GOOD) ? 0 : EIO;
476 break;
477 default:
cb59e840 478 old_hdr->result = EIO;
1da177e4
LT		 479 break;
480 }
481
482 /* Now copy the result back to the user buffer. */
483 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 484 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
485 retval = -EFAULT;
486 goto free_old_hdr;
487 }
1da177e4 488 buf += SZ_SG_HEADER;
cb59e840
DG		 489 if (count > old_hdr->reply_len)
490 count = old_hdr->reply_len;
1da177e4 491 if (count > SZ_SG_HEADER) {
cb59e840
DG		 492 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
493 retval = -EFAULT;
494 goto free_old_hdr;
495 }
1da177e4
LT		 496 }
497 } else
cb59e840 498 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 499 sg_finish_rem_req(srp);
cb59e840
DG		 500 retval = count;
501free_old_hdr:
c9475cb0 502 kfree(old_hdr);
cb59e840 503 return retval;
1da177e4
LT		 504}
505
506static ssize_t
507sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
508{
509 sg_io_hdr_t *hp = &srp->header;
510 int err = 0;
511 int len;
512
513 if (count < SZ_SG_IO_HDR) {
514 err = -EINVAL;
515 goto err_out;
516 }
517 hp->sb_len_wr = 0;
518 if ((hp->mx_sb_len > 0) && hp->sbp) {
519 if ((CHECK_CONDITION & hp->masked_status) ||
520 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 521 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 522 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
523 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
524 len = (len > sb_len) ? sb_len : len;
525 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
526 err = -EFAULT;
527 goto err_out;
528 }
529 hp->sb_len_wr = len;
530 }
531 }
532 if (hp->masked_status || hp->host_status || hp->driver_status)
533 hp->info |= SG_INFO_CHECK;
534 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
535 err = -EFAULT;
536 goto err_out;
537 }
538 err = sg_read_xfer(srp);
539 err_out:
540 sg_finish_rem_req(srp);
541 return (0 == err) ? count : err;
542}
543
544static ssize_t
545sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
546{
547 int mxsize, cmd_size, k;
548 int input_size, blocking;
549 unsigned char opcode;
550 Sg_device *sdp;
551 Sg_fd *sfp;
552 Sg_request *srp;
553 struct sg_header old_hdr;
554 sg_io_hdr_t *hp;
d6b10348 555 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 556
557 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
558 return -ENXIO;
559 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
560 sdp->disk->disk_name, (int) count));
561 if (sdp->detached)
562 return -ENODEV;
563 if (!((filp->f_flags & O_NONBLOCK) ||
564 scsi_block_when_processing_errors(sdp->device)))
565 return -ENXIO;
566
567 if (!access_ok(VERIFY_READ, buf, count))
568 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
569 if (count < SZ_SG_HEADER)
570 return -EIO;
571 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
572 return -EFAULT;
573 blocking = !(filp->f_flags & O_NONBLOCK);
574 if (old_hdr.reply_len < 0)
0b07de85 575 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL);
1da177e4
LT		 576 if (count < (SZ_SG_HEADER + 6))
577 return -EIO; /* The minimum scsi command length is 6 bytes. */
578
579 if (!(srp = sg_add_request(sfp))) {
580 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
581 return -EDOM;
582 }
583 buf += SZ_SG_HEADER;
584 __get_user(opcode, buf);
585 if (sfp->next_cmd_len > 0) {
586 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
587 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
588 sfp->next_cmd_len = 0;
589 sg_remove_request(sfp, srp);
590 return -EIO;
591 }
592 cmd_size = sfp->next_cmd_len;
593 sfp->next_cmd_len = 0; /* reset so only this write() effected */
594 } else {
595 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
596 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
597 cmd_size = 12;
598 }
599 SCSI_LOG_TIMEOUT(4, printk(
600 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
601/* Determine buffer size. */
602 input_size = count - cmd_size;
603 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
604 mxsize -= SZ_SG_HEADER;
605 input_size -= SZ_SG_HEADER;
606 if (input_size < 0) {
607 sg_remove_request(sfp, srp);
608 return -EIO; /* User did not pass enough bytes for this command. */
609 }
610 hp = &srp->header;
611 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
612 hp->cmd_len = (unsigned char) cmd_size;
613 hp->iovec_count = 0;
614 hp->mx_sb_len = 0;
615 if (input_size > 0)
616 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
617 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
618 else
619 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
620 hp->dxfer_len = mxsize;
621 hp->dxferp = (char __user *)buf + cmd_size;
622 hp->sbp = NULL;
623 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
624 hp->flags = input_size; /* structure abuse ... */
625 hp->pack_id = old_hdr.pack_id;
626 hp->usr_ptr = NULL;
627 if (__copy_from_user(cmnd, buf, cmd_size))
628 return -EFAULT;
629 /*
630 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
631 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
632 * is a non-zero input_size, so emit a warning.
633 */
eaa3e22e
AK		 634 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
635 static char cmd[TASK_COMM_LEN];
636 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
1da177e4
LT		 637 printk(KERN_WARNING
638 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
639 "guessing data in;\n" KERN_WARNING " "
640 "program %s not setting count and/or reply_len properly\n",
641 old_hdr.reply_len - (int)SZ_SG_HEADER,
642 input_size, (unsigned int) cmnd[0],
643 current->comm);
eaa3e22e
AK		 644 strcpy(cmd, current->comm);
645 }
646 }
1da177e4
LT		 647 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
648 return (k < 0) ? k : count;
649}
650
651static ssize_t
0b07de85
AG		 652sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf,
653 size_t count, int blocking, int read_only,
654 Sg_request **o_srp)
1da177e4
LT		 655{
656 int k;
657 Sg_request *srp;
658 sg_io_hdr_t *hp;
d6b10348 659 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 660 int timeout;
661 unsigned long ul_timeout;
662
663 if (count < SZ_SG_IO_HDR)
664 return -EINVAL;
665 if (!access_ok(VERIFY_READ, buf, count))
666 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
667
668 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
669 if (!(srp = sg_add_request(sfp))) {
670 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
671 return -EDOM;
672 }
673 hp = &srp->header;
674 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
675 sg_remove_request(sfp, srp);
676 return -EFAULT;
677 }
678 if (hp->interface_id != 'S') {
679 sg_remove_request(sfp, srp);
680 return -ENOSYS;
681 }
682 if (hp->flags & SG_FLAG_MMAP_IO) {
683 if (hp->dxfer_len > sfp->reserve.bufflen) {
684 sg_remove_request(sfp, srp);
685 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
686 }
687 if (hp->flags & SG_FLAG_DIRECT_IO) {
688 sg_remove_request(sfp, srp);
689 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
690 }
691 if (sg_res_in_use(sfp)) {
692 sg_remove_request(sfp, srp);
693 return -EBUSY; /* reserve buffer already being used */
694 }
695 }
696 ul_timeout = msecs_to_jiffies(srp->header.timeout);
697 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
698 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
699 sg_remove_request(sfp, srp);
700 return -EMSGSIZE;
701 }
702 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
703 sg_remove_request(sfp, srp);
704 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
705 }
706 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
707 sg_remove_request(sfp, srp);
708 return -EFAULT;
709 }
14e507b8 710 if (read_only && sg_allow_access(file, cmnd)) {
1da177e4
LT		 711 sg_remove_request(sfp, srp);
712 return -EPERM;
713 }
714 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
715 if (k < 0)
716 return k;
717 if (o_srp)
718 *o_srp = srp;
719 return count;
720}
721
722static int
723sg_common_write(Sg_fd * sfp, Sg_request * srp,
724 unsigned char *cmnd, int timeout, int blocking)
725{
d6b10348 726 int k, data_dir;
1da177e4
LT		 727 Sg_device *sdp = sfp->parentdp;
728 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 729
730 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
731 hp->status = 0;
732 hp->masked_status = 0;
733 hp->msg_status = 0;
734 hp->info = 0;
735 hp->host_status = 0;
736 hp->driver_status = 0;
737 hp->resid = 0;
738 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
739 (int) cmnd[0], (int) hp->cmd_len));
740
10865dfa
FT		 741 k = sg_start_req(srp, cmnd);
742 if (k) {
7ca63cb4 743 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 744 sg_finish_rem_req(srp);
745 return k; /* probably out of space --> ENOMEM */
746 }
747 if ((k = sg_write_xfer(srp))) {
7ca63cb4 748 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
1da177e4
LT		 749 sg_finish_rem_req(srp);
750 return k;
751 }
752 if (sdp->detached) {
753 sg_finish_rem_req(srp);
754 return -ENODEV;
755 }
1da177e4 756
1da177e4
LT		 757 switch (hp->dxfer_direction) {
758 case SG_DXFER_TO_FROM_DEV:
759 case SG_DXFER_FROM_DEV:
d6b10348 760 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 761 break;
762 case SG_DXFER_TO_DEV:
d6b10348 763 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 764 break;
765 case SG_DXFER_UNKNOWN:
d6b10348 766 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 767 break;
768 default:
d6b10348 769 data_dir = DMA_NONE;
1da177e4
LT		 770 break;
771 }
cb59e840 772 hp->duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 773/* Now send everything of to mid-level. The next time we hear about this
774 packet is when sg_cmd_done() is called (i.e. a callback). */
10865dfa
FT		 775 if (srp->rq) {
776 srp->rq->timeout = timeout;
777 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
778 srp->rq, 1, sg_rq_end_io);
779 return 0;
780 }
bb1d1073 781 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
d6b10348
MC		 782 hp->dxfer_len, srp->data.k_use_sg, timeout,
783 SG_DEFAULT_RETRIES, srp, sg_cmd_done,
784 GFP_ATOMIC)) {
7ca63cb4 785 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
d6b10348
MC		 786 /*
787 * most likely out of mem, but could also be a bad map
788 */
18c49b8c 789 sg_finish_rem_req(srp);
d6b10348
MC		 790 return -ENOMEM;
791 } else
792 return 0;
1da177e4
LT		 793}
794
795static int
796sg_srp_done(Sg_request *srp, Sg_fd *sfp)
797{
798 unsigned long iflags;
799 int done;
800
801 read_lock_irqsave(&sfp->rq_list_lock, iflags);
802 done = srp->done;
803 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
804 return done;
805}
806
807static int
808sg_ioctl(struct inode *inode, struct file *filp,
809 unsigned int cmd_in, unsigned long arg)
810{
811 void __user *p = (void __user *)arg;
812 int __user *ip = p;
813 int result, val, read_only;
814 Sg_device *sdp;
815 Sg_fd *sfp;
816 Sg_request *srp;
817 unsigned long iflags;
818
819 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
820 return -ENXIO;
abf54393 821
1da177e4
LT		 822 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
823 sdp->disk->disk_name, (int) cmd_in));
824 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
825
826 switch (cmd_in) {
827 case SG_IO:
828 {
829 int blocking = 1; /* ignore O_NONBLOCK flag */
830
831 if (sdp->detached)
832 return -ENODEV;
833 if (!scsi_block_when_processing_errors(sdp->device))
834 return -ENXIO;
835 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
836 return -EFAULT;
837 result =
0b07de85 838 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
1da177e4
LT		 839 blocking, read_only, &srp);
840 if (result < 0)
841 return result;
842 srp->sg_io_owned = 1;
843 while (1) {
844 result = 0; /* following macro to beat race condition */
845 __wait_event_interruptible(sfp->read_wait,
846 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
847 result);
848 if (sdp->detached)
849 return -ENODEV;
850 if (sfp->closed)
851 return 0; /* request packet dropped already */
852 if (0 == result)
853 break;
854 srp->orphan = 1;
855 return result; /* -ERESTARTSYS because signal hit process */
856 }
857 write_lock_irqsave(&sfp->rq_list_lock, iflags);
858 srp->done = 2;
859 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
860 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
861 return (result < 0) ? result : 0;
862 }
863 case SG_SET_TIMEOUT:
864 result = get_user(val, ip);
865 if (result)
866 return result;
867 if (val < 0)
868 return -EIO;
869 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
870 val = MULDIV (INT_MAX, USER_HZ, HZ);
871 sfp->timeout_user = val;
872 sfp->timeout = MULDIV (val, HZ, USER_HZ);
873
874 return 0;
875 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
876 /* strange ..., for backward compatibility */
877 return sfp->timeout_user;
878 case SG_SET_FORCE_LOW_DMA:
879 result = get_user(val, ip);
880 if (result)
881 return result;
882 if (val) {
883 sfp->low_dma = 1;
884 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
885 val = (int) sfp->reserve.bufflen;
886 sg_remove_scat(&sfp->reserve);
887 sg_build_reserve(sfp, val);
888 }
889 } else {
890 if (sdp->detached)
891 return -ENODEV;
892 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
893 }
894 return 0;
895 case SG_GET_LOW_DMA:
896 return put_user((int) sfp->low_dma, ip);
897 case SG_GET_SCSI_ID:
898 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
899 return -EFAULT;
900 else {
901 sg_scsi_id_t __user *sg_idp = p;
902
903 if (sdp->detached)
904 return -ENODEV;
905 __put_user((int) sdp->device->host->host_no,
906 &sg_idp->host_no);
907 __put_user((int) sdp->device->channel,
908 &sg_idp->channel);
909 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
910 __put_user((int) sdp->device->lun, &sg_idp->lun);
911 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
912 __put_user((short) sdp->device->host->cmd_per_lun,
913 &sg_idp->h_cmd_per_lun);
914 __put_user((short) sdp->device->queue_depth,
915 &sg_idp->d_queue_depth);
916 __put_user(0, &sg_idp->unused[0]);
917 __put_user(0, &sg_idp->unused[1]);
918 return 0;
919 }
920 case SG_SET_FORCE_PACK_ID:
921 result = get_user(val, ip);
922 if (result)
923 return result;
924 sfp->force_packid = val ? 1 : 0;
925 return 0;
926 case SG_GET_PACK_ID:
927 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
928 return -EFAULT;
929 read_lock_irqsave(&sfp->rq_list_lock, iflags);
930 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
931 if ((1 == srp->done) && (!srp->sg_io_owned)) {
932 read_unlock_irqrestore(&sfp->rq_list_lock,
933 iflags);
934 __put_user(srp->header.pack_id, ip);
935 return 0;
936 }
937 }
938 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
939 __put_user(-1, ip);
940 return 0;
941 case SG_GET_NUM_WAITING:
942 read_lock_irqsave(&sfp->rq_list_lock, iflags);
943 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
944 if ((1 == srp->done) && (!srp->sg_io_owned))
945 ++val;
946 }
947 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
948 return put_user(val, ip);
949 case SG_GET_SG_TABLESIZE:
950 return put_user(sdp->sg_tablesize, ip);
951 case SG_SET_RESERVED_SIZE:
952 result = get_user(val, ip);
953 if (result)
954 return result;
955 if (val < 0)
956 return -EINVAL;
44ec9542
AS		 957 val = min_t(int, val,
958 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 959 if (val != sfp->reserve.bufflen) {
960 if (sg_res_in_use(sfp) || sfp->mmap_called)
961 return -EBUSY;
962 sg_remove_scat(&sfp->reserve);
963 sg_build_reserve(sfp, val);
964 }
965 return 0;
966 case SG_GET_RESERVED_SIZE:
44ec9542
AS		 967 val = min_t(int, sfp->reserve.bufflen,
968 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 969 return put_user(val, ip);
970 case SG_SET_COMMAND_Q:
971 result = get_user(val, ip);
972 if (result)
973 return result;
974 sfp->cmd_q = val ? 1 : 0;
975 return 0;
976 case SG_GET_COMMAND_Q:
977 return put_user((int) sfp->cmd_q, ip);
978 case SG_SET_KEEP_ORPHAN:
979 result = get_user(val, ip);
980 if (result)
981 return result;
982 sfp->keep_orphan = val;
983 return 0;
984 case SG_GET_KEEP_ORPHAN:
985 return put_user((int) sfp->keep_orphan, ip);
986 case SG_NEXT_CMD_LEN:
987 result = get_user(val, ip);
988 if (result)
989 return result;
990 sfp->next_cmd_len = (val > 0) ? val : 0;
991 return 0;
992 case SG_GET_VERSION_NUM:
993 return put_user(sg_version_num, ip);
994 case SG_GET_ACCESS_COUNT:
995 /* faked - we don't have a real access count anymore */
996 val = (sdp->device ? 1 : 0);
997 return put_user(val, ip);
998 case SG_GET_REQUEST_TABLE:
999 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
1000 return -EFAULT;
1001 else {
cb59e840
DG		 1002 sg_req_info_t *rinfo;
1003 unsigned int ms;
1004
1005 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
1006 GFP_KERNEL);
1007 if (!rinfo)
1008 return -ENOMEM;
1da177e4
LT		 1009 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1010 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
1011 ++val, srp = srp ? srp->nextrp : srp) {
1012 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
1013 if (srp) {
1014 rinfo[val].req_state = srp->done + 1;
1015 rinfo[val].problem =
1016 srp->header.masked_status &
1017 srp->header.host_status &
1018 srp->header.driver_status;
cb59e840
DG		 1019 if (srp->done)
1020 rinfo[val].duration =
1021 srp->header.duration;
1022 else {
1023 ms = jiffies_to_msecs(jiffies);
1024 rinfo[val].duration =
1025 (ms > srp->header.duration) ?
1026 (ms - srp->header.duration) : 0;
1027 }
1da177e4 1028 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 1029 rinfo[val].sg_io_owned =
1030 srp->sg_io_owned;
1031 rinfo[val].pack_id =
1032 srp->header.pack_id;
1033 rinfo[val].usr_ptr =
1034 srp->header.usr_ptr;
1da177e4
LT		 1035 }
1036 }
1037 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1038 result = __copy_to_user(p, rinfo,
1039 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1040 result = result ? -EFAULT : 0;
1041 kfree(rinfo);
1042 return result;
1da177e4
LT		 1043 }
1044 case SG_EMULATED_HOST:
1045 if (sdp->detached)
1046 return -ENODEV;
1047 return put_user(sdp->device->host->hostt->emulated, ip);
1048 case SG_SCSI_RESET:
1049 if (sdp->detached)
1050 return -ENODEV;
1051 if (filp->f_flags & O_NONBLOCK) {
939647ee 1052 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1053 return -EBUSY;
1054 } else if (!scsi_block_when_processing_errors(sdp->device))
1055 return -EBUSY;
1056 result = get_user(val, ip);
1057 if (result)
1058 return result;
1059 if (SG_SCSI_RESET_NOTHING == val)
1060 return 0;
1061 switch (val) {
1062 case SG_SCSI_RESET_DEVICE:
1063 val = SCSI_TRY_RESET_DEVICE;
1064 break;
39120e11
BK		 1065 case SG_SCSI_RESET_TARGET:
1066 val = SCSI_TRY_RESET_TARGET;
1067 break;
1da177e4
LT		 1068 case SG_SCSI_RESET_BUS:
1069 val = SCSI_TRY_RESET_BUS;
1070 break;
1071 case SG_SCSI_RESET_HOST:
1072 val = SCSI_TRY_RESET_HOST;
1073 break;
1074 default:
1075 return -EINVAL;
1076 }
1077 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1078 return -EACCES;
1079 return (scsi_reset_provider(sdp->device, val) ==
1080 SUCCESS) ? 0 : -EIO;
1081 case SCSI_IOCTL_SEND_COMMAND:
1082 if (sdp->detached)
1083 return -ENODEV;
1084 if (read_only) {
1085 unsigned char opcode = WRITE_6;
1086 Scsi_Ioctl_Command __user *siocp = p;
1087
1088 if (copy_from_user(&opcode, siocp->data, 1))
1089 return -EFAULT;
14e507b8 1090 if (sg_allow_access(filp, &opcode))
1da177e4
LT		 1091 return -EPERM;
1092 }
21b2f0c8 1093 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
1da177e4
LT		 1094 case SG_SET_DEBUG:
1095 result = get_user(val, ip);
1096 if (result)
1097 return result;
1098 sdp->sgdebug = (char) val;
1099 return 0;
1100 case SCSI_IOCTL_GET_IDLUN:
1101 case SCSI_IOCTL_GET_BUS_NUMBER:
1102 case SCSI_IOCTL_PROBE_HOST:
1103 case SG_GET_TRANSFORM:
1104 if (sdp->detached)
1105 return -ENODEV;
1106 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542
AS		 1107 case BLKSECTGET:
1108 return put_user(sdp->device->request_queue->max_sectors * 512,
1109 ip);
6da127ad
CS		 1110 case BLKTRACESETUP:
1111 return blk_trace_setup(sdp->device->request_queue,
1112 sdp->disk->disk_name,
1113 sdp->device->sdev_gendev.devt,
1114 (char *)arg);
1115 case BLKTRACESTART:
1116 return blk_trace_startstop(sdp->device->request_queue, 1);
1117 case BLKTRACESTOP:
1118 return blk_trace_startstop(sdp->device->request_queue, 0);
1119 case BLKTRACETEARDOWN:
1120 return blk_trace_remove(sdp->device->request_queue);
1da177e4
LT		 1121 default:
1122 if (read_only)
1123 return -EPERM; /* don't know so take safe approach */
1124 return scsi_ioctl(sdp->device, cmd_in, p);
1125 }
1126}
1127
1128#ifdef CONFIG_COMPAT
1129static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1130{
1131 Sg_device *sdp;
1132 Sg_fd *sfp;
1133 struct scsi_device *sdev;
1134
1135 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1136 return -ENXIO;
1137
1138 sdev = sdp->device;
1139 if (sdev->host->hostt->compat_ioctl) {
1140 int ret;
1141
1142 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1143
1144 return ret;
1145 }
1146
1147 return -ENOIOCTLCMD;
1148}
1149#endif
1150
1151static unsigned int
1152sg_poll(struct file *filp, poll_table * wait)
1153{
1154 unsigned int res = 0;
1155 Sg_device *sdp;
1156 Sg_fd *sfp;
1157 Sg_request *srp;
1158 int count = 0;
1159 unsigned long iflags;
1160
1161 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1162 || sfp->closed)
1163 return POLLERR;
1164 poll_wait(filp, &sfp->read_wait, wait);
1165 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1166 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1167 /* if any read waiting, flag it */
1168 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1169 res = POLLIN | POLLRDNORM;
1170 ++count;
1171 }
1172 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1173
1174 if (sdp->detached)
1175 res |= POLLHUP;
1176 else if (!sfp->cmd_q) {
1177 if (0 == count)
1178 res |= POLLOUT | POLLWRNORM;
1179 } else if (count < SG_MAX_QUEUE)
1180 res |= POLLOUT | POLLWRNORM;
1181 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1182 sdp->disk->disk_name, (int) res));
1183 return res;
1184}
1185
1186static int
1187sg_fasync(int fd, struct file *filp, int mode)
1188{
1189 int retval;
1190 Sg_device *sdp;
1191 Sg_fd *sfp;
1192
1193 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1194 return -ENXIO;
1195 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1196 sdp->disk->disk_name, mode));
1197
1198 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1199 return (retval < 0) ? retval : 0;
1200}
1201
a13ff0bb
NP		 1202static int
1203sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1da177e4
LT		 1204{
1205 Sg_fd *sfp;
d6b10348 1206 unsigned long offset, len, sa;
1da177e4 1207 Sg_scatter_hold *rsv_schp;
d6b10348
MC		 1208 struct scatterlist *sg;
1209 int k;
1da177e4
LT		 1210
1211 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
a13ff0bb 1212 return VM_FAULT_SIGBUS;
1da177e4 1213 rsv_schp = &sfp->reserve;
a13ff0bb 1214 offset = vmf->pgoff << PAGE_SHIFT;
1da177e4 1215 if (offset >= rsv_schp->bufflen)
a13ff0bb
NP		 1216 return VM_FAULT_SIGBUS;
1217 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1da177e4 1218 offset, rsv_schp->k_use_sg));
d6b10348
MC		 1219 sg = rsv_schp->buffer;
1220 sa = vma->vm_start;
1221 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
b0f655d0 1222 ++k, sg = sg_next(sg)) {
d6b10348
MC		 1223 len = vma->vm_end - sa;
1224 len = (len < sg->length) ? len : sg->length;
1225 if (offset < len) {
a13ff0bb 1226 struct page *page;
45711f1a 1227 page = virt_to_page(page_address(sg_page(sg)) + offset);
d6b10348 1228 get_page(page); /* increment page count */
a13ff0bb
NP		 1229 vmf->page = page;
1230 return 0; /* success */
1da177e4 1231 }
d6b10348
MC		 1232 sa += len;
1233 offset -= len;
1da177e4 1234 }
d6b10348 1235
a13ff0bb 1236 return VM_FAULT_SIGBUS;
1da177e4
LT		 1237}
1238
1239static struct vm_operations_struct sg_mmap_vm_ops = {
a13ff0bb 1240 .fault = sg_vma_fault,
1da177e4
LT		 1241};
1242
1243static int
1244sg_mmap(struct file *filp, struct vm_area_struct *vma)
1245{
1246 Sg_fd *sfp;
d6b10348 1247 unsigned long req_sz, len, sa;
1da177e4 1248 Sg_scatter_hold *rsv_schp;
d6b10348
MC		 1249 int k;
1250 struct scatterlist *sg;
1da177e4
LT		 1251
1252 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1253 return -ENXIO;
cb59e840 1254 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1255 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1256 (void *) vma->vm_start, (int) req_sz));
1257 if (vma->vm_pgoff)
1258 return -EINVAL; /* want no offset */
1259 rsv_schp = &sfp->reserve;
1260 if (req_sz > rsv_schp->bufflen)
1261 return -ENOMEM; /* cannot map more than reserved buffer */
1262
d6b10348
MC		 1263 sa = vma->vm_start;
1264 sg = rsv_schp->buffer;
1265 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
b0f655d0 1266 ++k, sg = sg_next(sg)) {
d6b10348
MC		 1267 len = vma->vm_end - sa;
1268 len = (len < sg->length) ? len : sg->length;
1269 sa += len;
1da177e4 1270 }
d6b10348 1271
f9aed0e2 1272 sfp->mmap_called = 1;
1c8e71d7 1273 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1274 vma->vm_private_data = sfp;
1275 vma->vm_ops = &sg_mmap_vm_ops;
1276 return 0;
1277}
1278
1279/* This function is a "bottom half" handler that is called by the
1280 * mid level when a command is completed (or has failed). */
1281static void
d6b10348 1282sg_cmd_done(void *data, char *sense, int result, int resid)
1da177e4 1283{
d6b10348 1284 Sg_request *srp = data;
1da177e4
LT		 1285 Sg_device *sdp = NULL;
1286 Sg_fd *sfp;
1da177e4 1287 unsigned long iflags;
cb59e840 1288 unsigned int ms;
1da177e4 1289
1da177e4
LT		 1290 if (NULL == srp) {
1291 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1da177e4
LT		 1292 return;
1293 }
1294 sfp = srp->parentfp;
1295 if (sfp)
1296 sdp = sfp->parentdp;
1297 if ((NULL == sdp) || sdp->detached) {
1298 printk(KERN_INFO "sg_cmd_done: device detached\n");
1da177e4
LT		 1299 return;
1300 }
1301
1da177e4
LT		 1302
1303 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1304 sdp->disk->disk_name, srp->header.pack_id, result));
1305 srp->header.resid = resid;
cb59e840
DG		 1306 ms = jiffies_to_msecs(jiffies);
1307 srp->header.duration = (ms > srp->header.duration) ?
1308 (ms - srp->header.duration) : 0;
d6b10348 1309 if (0 != result) {
1da177e4
LT		 1310 struct scsi_sense_hdr sshdr;
1311
d6b10348
MC		 1312 memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
1313 srp->header.status = 0xff & result;
1314 srp->header.masked_status = status_byte(result);
1315 srp->header.msg_status = msg_byte(result);
1316 srp->header.host_status = host_byte(result);
1317 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1318 if ((sdp->sgdebug > 0) &&
1319 ((CHECK_CONDITION == srp->header.masked_status) ||
1320 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1321 __scsi_print_sense("sg_cmd_done", sense,
1322 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1323
1324 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1325 if (driver_byte(result) != 0
1326 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1327 && !scsi_sense_is_deferred(&sshdr)
1328 && sshdr.sense_key == UNIT_ATTENTION
1329 && sdp->device->removable) {
1330 /* Detected possible disc change. Set the bit - this */
1331 /* may be used if there are filesystems using this device */
1332 sdp->device->changed = 1;
1333 }
1334 }
1335 /* Rely on write phase to clean out srp status values, so no "else" */
1336
1da177e4
LT		 1337 if (sfp->closed) { /* whoops this fd already released, cleanup */
1338 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1339 sg_finish_rem_req(srp);
1340 srp = NULL;
1341 if (NULL == sfp->headrp) {
7ca63cb4 1342 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1da177e4
LT		 1343 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1344 scsi_device_put(sdp->device);
1345 }
1346 sfp = NULL;
1347 }
1348 } else if (srp && srp->orphan) {
1349 if (sfp->keep_orphan)
1350 srp->sg_io_owned = 0;
1351 else {
1352 sg_finish_rem_req(srp);
1353 srp = NULL;
1354 }
1355 }
1356 if (sfp && srp) {
1357 /* Now wake up any sg_read() that is waiting for this packet. */
1358 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1359 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1360 srp->done = 1;
1361 wake_up_interruptible(&sfp->read_wait);
1362 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1363 }
1364}
1365
1366static struct file_operations sg_fops = {
1367 .owner = THIS_MODULE,
1368 .read = sg_read,
1369 .write = sg_write,
1370 .poll = sg_poll,
1371 .ioctl = sg_ioctl,
1372#ifdef CONFIG_COMPAT
1373 .compat_ioctl = sg_compat_ioctl,
1374#endif
1375 .open = sg_open,
1376 .mmap = sg_mmap,
1377 .release = sg_release,
1378 .fasync = sg_fasync,
1379};
1380
d253878b 1381static struct class *sg_sysfs_class;
1da177e4
LT		 1382
1383static int sg_sysfs_valid = 0;
1384
7c07d613 1385static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1386{
d6b10348 1387 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1388 Sg_device *sdp;
1389 unsigned long iflags;
7c07d613
JB		 1390 int error;
1391 u32 k;
1da177e4 1392
24669f75 1393 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1394 if (!sdp) {
1395 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1396 return ERR_PTR(-ENOMEM);
1397 }
1398 error = -ENOMEM;
1399 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1400 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1401 goto out;
1da177e4
LT		 1402 }
1403
7c07d613
JB		 1404 write_lock_irqsave(&sg_index_lock, iflags);
1405 error = idr_get_new(&sg_index_idr, sdp, &k);
1406 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1407
7c07d613
JB		 1408 if (error) {
1409 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1410 error);
1411 goto out;
1da177e4
LT		 1412 }
1413
1da177e4
LT		 1414 if (unlikely(k >= SG_MAX_DEVS))
1415 goto overflow;
1416
1da177e4
LT		 1417 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1418 sprintf(disk->disk_name, "sg%d", k);
1419 disk->first_minor = k;
1420 sdp->disk = disk;
1421 sdp->device = scsidp;
1422 init_waitqueue_head(&sdp->o_excl_wait);
d6b10348 1423 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
7c07d613 1424 sdp->index = k;
1da177e4 1425
7c07d613 1426 error = 0;
1da177e4 1427 out:
7c07d613 1428 if (error) {
1da177e4 1429 kfree(sdp);
7c07d613
JB		 1430 return ERR_PTR(error);
1431 }
1432 return sdp;
1da177e4
LT		 1433
1434 overflow:
9ccfc756
JB		 1435 sdev_printk(KERN_WARNING, scsidp,
1436 "Unable to attach sg device type=%d, minor "
1437 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1438 error = -ENODEV;
1439 goto out;
1440}
1441
1442static int
ee959b00 1443sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1444{
ee959b00 1445 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1da177e4
LT		 1446 struct gendisk *disk;
1447 Sg_device *sdp = NULL;
1448 struct cdev * cdev = NULL;
7c07d613 1449 int error;
454e8957 1450 unsigned long iflags;
1da177e4
LT		 1451
1452 disk = alloc_disk(1);
1453 if (!disk) {
1454 printk(KERN_WARNING "alloc_disk failed\n");
1455 return -ENOMEM;
1456 }
1457 disk->major = SCSI_GENERIC_MAJOR;
1458
1459 error = -ENOMEM;
1460 cdev = cdev_alloc();
1461 if (!cdev) {
1462 printk(KERN_WARNING "cdev_alloc failed\n");
1463 goto out;
1464 }
1465 cdev->owner = THIS_MODULE;
1466 cdev->ops = &sg_fops;
1467
7c07d613
JB		 1468 sdp = sg_alloc(disk, scsidp);
1469 if (IS_ERR(sdp)) {
1da177e4 1470 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1471 error = PTR_ERR(sdp);
1da177e4
LT		 1472 goto out;
1473 }
1da177e4 1474
7c07d613 1475 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1476 if (error)
454e8957 1477 goto cdev_add_err;
5e3c34c1 1478
1da177e4
LT		 1479 sdp->cdev = cdev;
1480 if (sg_sysfs_valid) {
ee959b00 1481 struct device *sg_class_member;
1da177e4 1482
24b42566
GKH		 1483 sg_class_member = device_create_drvdata(sg_sysfs_class,
1484 cl_dev->parent,
1485 MKDEV(SCSI_GENERIC_MAJOR,
1486 sdp->index),
1487 sdp,
1488 "%s", disk->disk_name);
d07e0361
FT		 1489 if (IS_ERR(sg_class_member)) {
1490 printk(KERN_ERR "sg_add: "
ee959b00 1491 "device_create failed\n");
d07e0361
FT		 1492 error = PTR_ERR(sg_class_member);
1493 goto cdev_add_err;
1494 }
d07e0361 1495 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1496 &sg_class_member->kobj, "generic");
1497 if (error)
1498 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1499 "'generic' back to sg%d\n", sdp->index);
1da177e4 1500 } else
7c07d613 1501 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1502
9ccfc756 1503 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1504 "Attached scsi generic sg%d type %d\n", sdp->index,
1505 scsidp->type);
1da177e4 1506
ee959b00 1507 dev_set_drvdata(cl_dev, sdp);
a24484f2 1508
1da177e4
LT		 1509 return 0;
1510
454e8957 1511cdev_add_err:
7c07d613
JB		 1512 write_lock_irqsave(&sg_index_lock, iflags);
1513 idr_remove(&sg_index_idr, sdp->index);
1514 write_unlock_irqrestore(&sg_index_lock, iflags);
1515 kfree(sdp);
454e8957 1516
1da177e4
LT		 1517out:
1518 put_disk(disk);
1519 if (cdev)
1520 cdev_del(cdev);
1521 return error;
1522}
1523
1524static void
ee959b00 1525sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1da177e4 1526{
ee959b00
TJ		 1527 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1528 Sg_device *sdp = dev_get_drvdata(cl_dev);
1da177e4
LT		 1529 unsigned long iflags;
1530 Sg_fd *sfp;
1531 Sg_fd *tsfp;
1532 Sg_request *srp;
1533 Sg_request *tsrp;
7c07d613 1534 int delay;
1da177e4 1535
7c07d613 1536 if (!sdp)
1da177e4 1537 return;
7c07d613 1538
1da177e4 1539 delay = 0;
7c07d613
JB		 1540 write_lock_irqsave(&sg_index_lock, iflags);
1541 if (sdp->headfp) {
1542 sdp->detached = 1;
1543 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1544 tsfp = sfp->nextfp;
1545 for (srp = sfp->headrp; srp; srp = tsrp) {
1546 tsrp = srp->nextrp;
1547 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1548 sg_finish_rem_req(srp);
1da177e4 1549 }
7c07d613
JB		 1550 if (sfp->closed) {
1551 scsi_device_put(sdp->device);
1552 __sg_remove_sfp(sdp, sfp);
1553 } else {
1554 delay = 1;
1555 wake_up_interruptible(&sfp->read_wait);
1556 kill_fasync(&sfp->async_qp, SIGPOLL,
1557 POLL_HUP);
1da177e4 1558 }
1da177e4 1559 }
7c07d613
JB		 1560 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1561 if (NULL == sdp->headfp) {
1562 idr_remove(&sg_index_idr, sdp->index);
1563 }
1564 } else { /* nothing active, simple case */
1565 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1566 idr_remove(&sg_index_idr, sdp->index);
1567 }
1568 write_unlock_irqrestore(&sg_index_lock, iflags);
1569
1570 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
ee959b00 1571 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
7c07d613
JB		 1572 cdev_del(sdp->cdev);
1573 sdp->cdev = NULL;
1574 put_disk(sdp->disk);
1575 sdp->disk = NULL;
1576 if (NULL == sdp->headfp)
1577 kfree(sdp);
1da177e4
LT		 1578
1579 if (delay)
1580 msleep(10); /* dirty detach so delay device destruction */
1581}
1582
6460e75a
DG		 1583module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1584module_param_named(def_reserved_size, def_reserved_size, int,
1585 S_IRUGO | S_IWUSR);
1da177e4
LT		 1586module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1587
1588MODULE_AUTHOR("Douglas Gilbert");
1589MODULE_DESCRIPTION("SCSI generic (sg) driver");
1590MODULE_LICENSE("GPL");
1591MODULE_VERSION(SG_VERSION_STR);
f018fa55 1592MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1593
6460e75a
DG		 1594MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1595 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1596MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1597MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1598
1599static int __init
1600init_sg(void)
1601{
1602 int rc;
1603
6460e75a
DG		 1604 if (scatter_elem_sz < PAGE_SIZE) {
1605 scatter_elem_sz = PAGE_SIZE;
1606 scatter_elem_sz_prev = scatter_elem_sz;
1607 }
1da177e4
LT		 1608 if (def_reserved_size >= 0)
1609 sg_big_buff = def_reserved_size;
6460e75a
DG		 1610 else
1611 def_reserved_size = sg_big_buff;
1da177e4
LT		 1612
1613 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1614 SG_MAX_DEVS, "sg");
1615 if (rc)
1616 return rc;
d253878b 1617 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1618 if ( IS_ERR(sg_sysfs_class) ) {
1619 rc = PTR_ERR(sg_sysfs_class);
1620 goto err_out;
1621 }
1622 sg_sysfs_valid = 1;
1623 rc = scsi_register_interface(&sg_interface);
1624 if (0 == rc) {
1625#ifdef CONFIG_SCSI_PROC_FS
1626 sg_proc_init();
1627#endif /* CONFIG_SCSI_PROC_FS */
1628 return 0;
1629 }
d253878b 1630 class_destroy(sg_sysfs_class);
1da177e4
LT		 1631err_out:
1632 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1633 return rc;
1634}
1635
1636static void __exit
1637exit_sg(void)
1638{
1639#ifdef CONFIG_SCSI_PROC_FS
1640 sg_proc_cleanup();
1641#endif /* CONFIG_SCSI_PROC_FS */
1642 scsi_unregister_interface(&sg_interface);
d253878b 1643 class_destroy(sg_sysfs_class);
1da177e4
LT		 1644 sg_sysfs_valid = 0;
1645 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1646 SG_MAX_DEVS);
7c07d613 1647 idr_destroy(&sg_index_idr);
1da177e4
LT		 1648}
1649
10865dfa
FT		 1650static int __sg_start_req(struct sg_request *srp, struct sg_io_hdr *hp,
1651 unsigned char *cmd)
1652{
1653 struct sg_fd *sfp = srp->parentfp;
1654 struct request_queue *q = sfp->parentdp->device->request_queue;
1655 struct request *rq;
1656 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1657
1658 rq = blk_get_request(q, rw, GFP_ATOMIC);
1659 if (!rq)
1660 return -ENOMEM;
1661
1662 memcpy(rq->cmd, cmd, hp->cmd_len);
1663
1664 rq->cmd_len = hp->cmd_len;
1665 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1666
1667 srp->rq = rq;
1668 rq->end_io_data = srp;
1669 rq->sense = srp->sense_b;
1670 rq->retries = SG_DEFAULT_RETRIES;
1671
1672 return 0;
1673}
1674
1675static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1da177e4
LT		 1676{
1677 int res;
1678 Sg_fd *sfp = srp->parentfp;
1679 sg_io_hdr_t *hp = &srp->header;
1680 int dxfer_len = (int) hp->dxfer_len;
1681 int dxfer_dir = hp->dxfer_direction;
1682 Sg_scatter_hold *req_schp = &srp->data;
1683 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1684
1685 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
10865dfa 1686
1da177e4 1687 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
10865dfa
FT		 1688 return __sg_start_req(srp, hp, cmd);
1689
1da177e4
LT		 1690 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1691 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1692 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1693 res = sg_build_direct(srp, sfp, dxfer_len);
1694 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1695 return res;
1696 }
1697 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1698 sg_link_reserve(sfp, srp, dxfer_len);
1699 else {
1700 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1701 if (res) {
1702 sg_remove_scat(req_schp);
1703 return res;
1704 }
1705 }
1706 return 0;
1707}
1708
1709static void
1710sg_finish_rem_req(Sg_request * srp)
1711{
1712 Sg_fd *sfp = srp->parentfp;
1713 Sg_scatter_hold *req_schp = &srp->data;
1714
1715 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1716 if (srp->res_used)
1717 sg_unlink_reserve(sfp, srp);
1718 else
1719 sg_remove_scat(req_schp);
10865dfa
FT		 1720
1721 if (srp->rq)
1722 blk_put_request(srp->rq);
1723
1da177e4
LT		 1724 sg_remove_request(sfp, srp);
1725}
1726
1727static int
1728sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1729{
d6b10348 1730 int sg_bufflen = tablesize * sizeof(struct scatterlist);
2d20eaf9 1731 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1732
d6b10348
MC		 1733 /*
1734 * TODO: test without low_dma, we should not need it since
1735 * the block layer will bounce the buffer for us
1736 *
1737 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1738 */
1739 if (sfp->low_dma)
1740 gfp_flags |= GFP_DMA;
1741 schp->buffer = kzalloc(sg_bufflen, gfp_flags);
1da177e4
LT		 1742 if (!schp->buffer)
1743 return -ENOMEM;
30fa0d0f 1744 sg_init_table(schp->buffer, tablesize);
1da177e4 1745 schp->sglist_len = sg_bufflen;
d6b10348 1746 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1747}
1748
1749#ifdef SG_ALLOW_DIO_CODE
1750/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
d6b10348 1751 /* TODO: hopefully we can use the generic block layer code */
1da177e4
LT		 1752
1753/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1754 - mapping of all pages not successful
1da177e4
LT		 1755 (i.e., either completely successful or fails)
1756*/
1757static int
1758st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
d6b10348 1759 unsigned long uaddr, size_t count, int rw)
1da177e4 1760{
deb92b7e
DG		 1761 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1762 unsigned long start = uaddr >> PAGE_SHIFT;
1763 const int nr_pages = end - start;
1da177e4 1764 int res, i, j;
1da177e4
LT		 1765 struct page **pages;
1766
1da177e4
LT		 1767 /* User attempted Overflow! */
1768 if ((uaddr + count) < uaddr)
1769 return -EINVAL;
1770
1771 /* Too big */
1772 if (nr_pages > max_pages)
1773 return -ENOMEM;
1774
1775 /* Hmm? */
1776 if (count == 0)
1777 return 0;
1778
1779 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1780 return -ENOMEM;
1781
1782 /* Try to fault in all of the necessary pages */
1783 down_read(&current->mm->mmap_sem);
1784 /* rw==READ means read from drive, write into memory area */
1785 res = get_user_pages(
1786 current,
1787 current->mm,
1788 uaddr,
1789 nr_pages,
1790 rw == READ,
1791 0, /* don't force */
1792 pages,
1793 NULL);
1794 up_read(&current->mm->mmap_sem);
1795
1796 /* Errors and no page mapped should return here */
1797 if (res < nr_pages)
1798 goto out_unmap;
1799
1800 for (i=0; i < nr_pages; i++) {
1801 /* FIXME: flush superflous for rw==READ,
1802 * probably wrong function for rw==WRITE
1803 */
1804 flush_dcache_page(pages[i]);
1da177e4 1805 /* ?? Is locking needed? I don't think so */
529ae9aa 1806 /* if (!trylock_page(pages[i]))
1da177e4
LT		 1807 goto out_unlock; */
1808 }
1809
642f1490 1810 sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK);
1da177e4
LT		 1811 if (nr_pages > 1) {
1812 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1813 count -= sgl[0].length;
642f1490
JA		 1814 for (i=1; i < nr_pages ; i++)
1815 sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0);
1da177e4
LT		 1816 }
1817 else {
1818 sgl[0].length = count;
1819 }
1820
1821 kfree(pages);
1822 return nr_pages;
1823
1da177e4 1824 out_unmap:
4d5cda06 1825 if (res > 0) {
1da177e4
LT		 1826 for (j=0; j < res; j++)
1827 page_cache_release(pages[j]);
4d5cda06
HD		 1828 res = 0;
1829 }
1da177e4
LT		 1830 kfree(pages);
1831 return res;
1832}
1833
1834
1835/* And unmap them... */
1836static int
1837st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1838 int dirtied)
1839{
1840 int i;
1841
1842 for (i=0; i < nr_pages; i++) {
45711f1a 1843 struct page *page = sg_page(&sgl[i]);
b5810039 1844
b5810039
NP		 1845 if (dirtied)
1846 SetPageDirty(page);
1847 /* unlock_page(page); */
1da177e4
LT		 1848 /* FIXME: cache flush missing for rw==READ
1849 * FIXME: call the correct reference counting function
1850 */
b5810039 1851 page_cache_release(page);
1da177e4
LT		 1852 }
1853
1854 return 0;
1855}
1856
1857/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1858#endif
1859
1860
1861/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1862static int
1863sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1864{
1865#ifdef SG_ALLOW_DIO_CODE
1866 sg_io_hdr_t *hp = &srp->header;
1867 Sg_scatter_hold *schp = &srp->data;
1868 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4
LT		 1869 int mx_sc_elems, res;
1870 struct scsi_device *sdev = sfp->parentdp->device;
1871
1872 if (((unsigned long)hp->dxferp &
1873 queue_dma_alignment(sdev->request_queue)) != 0)
1874 return 1;
d6b10348 1875
1da177e4
LT		 1876 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1877 if (mx_sc_elems <= 0) {
1878 return 1;
1879 }
d6b10348
MC		 1880 res = st_map_user_pages(schp->buffer, mx_sc_elems,
1881 (unsigned long)hp->dxferp, dxfer_len,
1882 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
c06bb7f5
DG		 1883 if (res <= 0) {
1884 sg_remove_scat(schp);
1da177e4 1885 return 1;
c06bb7f5 1886 }
1da177e4
LT		 1887 schp->k_use_sg = res;
1888 schp->dio_in_use = 1;
1889 hp->info |= SG_INFO_DIRECT_IO;
1890 return 0;
1891#else
1892 return 1;
1893#endif
1894}
1895
1896static int
1897sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1898{
d6b10348
MC		 1899 struct scatterlist *sg;
1900 int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
1901 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4 1902 int blk_size = buff_size;
d6b10348 1903 struct page *p = NULL;
1da177e4 1904
fb119935 1905 if (blk_size < 0)
1da177e4
LT		 1906 return -EFAULT;
1907 if (0 == blk_size)
1908 ++blk_size; /* don't know why */
1909/* round request up to next highest SG_SECTOR_SZ byte boundary */
1910 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1911 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1912 buff_size, blk_size));
d6b10348
MC		 1913
1914 /* N.B. ret_sz carried into this block ... */
1915 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1916 if (mx_sc_elems < 0)
1917 return mx_sc_elems; /* most likely -ENOMEM */
1918
6460e75a
DG		 1919 num = scatter_elem_sz;
1920 if (unlikely(num != scatter_elem_sz_prev)) {
1921 if (num < PAGE_SIZE) {
1922 scatter_elem_sz = PAGE_SIZE;
1923 scatter_elem_sz_prev = PAGE_SIZE;
1924 } else
1925 scatter_elem_sz_prev = num;
1926 }
d6b10348
MC		 1927 for (k = 0, sg = schp->buffer, rem_sz = blk_size;
1928 (rem_sz > 0) && (k < mx_sc_elems);
b0f655d0 1929 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {
d6b10348 1930
6460e75a
DG		 1931 num = (rem_sz > scatter_elem_sz_prev) ?
1932 scatter_elem_sz_prev : rem_sz;
d6b10348 1933 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1da177e4
LT		 1934 if (!p)
1935 return -ENOMEM;
d6b10348 1936
6460e75a
DG		 1937 if (num == scatter_elem_sz_prev) {
1938 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1939 scatter_elem_sz = ret_sz;
1940 scatter_elem_sz_prev = ret_sz;
1941 }
1942 }
642f1490 1943 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0);
d6b10348 1944
7ca63cb4
DG		 1945 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1946 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1947 } /* end of for loop */
1948
1949 schp->k_use_sg = k;
7ca63cb4
DG		 1950 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1951 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1952
1953 schp->bufflen = blk_size;
1954 if (rem_sz > 0) /* must have failed */
1955 return -ENOMEM;
1956
1da177e4
LT		 1957 return 0;
1958}
1959
1960static int
1961sg_write_xfer(Sg_request * srp)
1962{
1963 sg_io_hdr_t *hp = &srp->header;
1964 Sg_scatter_hold *schp = &srp->data;
d6b10348 1965 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 1966 int num_xfer = 0;
1967 int j, k, onum, usglen, ksglen, res;
1968 int iovec_count = (int) hp->iovec_count;
1969 int dxfer_dir = hp->dxfer_direction;
1970 unsigned char *p;
1971 unsigned char __user *up;
1972 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1973
1974 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1975 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1976 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1977 if (schp->bufflen < num_xfer)
1978 num_xfer = schp->bufflen;
1979 }
1980 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1981 (new_interface
1982 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1983 return 0;
1984
1985 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1986 num_xfer, iovec_count, schp->k_use_sg));
1987 if (iovec_count) {
1988 onum = iovec_count;
1989 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1990 return -EFAULT;
1991 } else
1992 onum = 1;
1993
d6b10348 1994 ksglen = sg->length;
45711f1a 1995 p = page_address(sg_page(sg));
d6b10348
MC		 1996 for (j = 0, k = 0; j < onum; ++j) {
1997 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1998 if (res)
1999 return res;
2000
b0f655d0 2001 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 2002 p = page_address(sg_page(sg))) {
d6b10348
MC		 2003 if (usglen <= 0)
2004 break;
2005 if (ksglen > usglen) {
2006 if (usglen >= num_xfer) {
2007 if (__copy_from_user(p, up, num_xfer))
1da177e4 2008 return -EFAULT;
d6b10348 2009 return 0;
1da177e4 2010 }
d6b10348
MC		 2011 if (__copy_from_user(p, up, usglen))
2012 return -EFAULT;
2013 p += usglen;
2014 ksglen -= usglen;
2015 break;
2016 } else {
2017 if (ksglen >= num_xfer) {
2018 if (__copy_from_user(p, up, num_xfer))
2019 return -EFAULT;
1da177e4 2020 return 0;
d6b10348
MC		 2021 }
2022 if (__copy_from_user(p, up, ksglen))
2023 return -EFAULT;
2024 up += ksglen;
2025 usglen -= ksglen;
1da177e4 2026 }
d6b10348
MC		 2027 ++k;
2028 if (k >= schp->k_use_sg)
2029 return 0;
1da177e4
LT		 2030 }
2031 }
d6b10348 2032
1da177e4
LT		 2033 return 0;
2034}
2035
2036static int
2037sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
2038 int wr_xf, int *countp, unsigned char __user **up)
2039{
2040 int num_xfer = (int) hp->dxfer_len;
2041 unsigned char __user *p = hp->dxferp;
2042 int count;
2043
2044 if (0 == sg_num) {
2045 if (wr_xf && ('\0' == hp->interface_id))
2046 count = (int) hp->flags; /* holds "old" input_size */
2047 else
2048 count = num_xfer;
2049 } else {
2050 sg_iovec_t iovec;
2051 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2052 return -EFAULT;
2053 p = iovec.iov_base;
2054 count = (int) iovec.iov_len;
2055 }
2056 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
2057 return -EFAULT;
2058 if (up)
2059 *up = p;
2060 if (countp)
2061 *countp = count;
2062 return 0;
2063}
2064
2065static void
2066sg_remove_scat(Sg_scatter_hold * schp)
2067{
2068 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2069 if (schp->buffer && (schp->sglist_len > 0)) {
d6b10348 2070 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 2071
2072 if (schp->dio_in_use) {
2073#ifdef SG_ALLOW_DIO_CODE
d6b10348 2074 st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
1da177e4
LT		 2075#endif
2076 } else {
2077 int k;
2078
45711f1a 2079 for (k = 0; (k < schp->k_use_sg) && sg_page(sg);
b0f655d0 2080 ++k, sg = sg_next(sg)) {
1da177e4 2081 SCSI_LOG_TIMEOUT(5, printk(
7ca63cb4 2082 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
45711f1a
JA		 2083 k, sg_page(sg), sg->length));
2084 sg_page_free(sg_page(sg), sg->length);
1da177e4
LT		 2085 }
2086 }
d6b10348
MC		 2087 kfree(schp->buffer);
2088 }
1da177e4
LT		 2089 memset(schp, 0, sizeof (*schp));
2090}
2091
2092static int
2093sg_read_xfer(Sg_request * srp)
2094{
2095 sg_io_hdr_t *hp = &srp->header;
2096 Sg_scatter_hold *schp = &srp->data;
d6b10348 2097 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 2098 int num_xfer = 0;
2099 int j, k, onum, usglen, ksglen, res;
2100 int iovec_count = (int) hp->iovec_count;
2101 int dxfer_dir = hp->dxfer_direction;
2102 unsigned char *p;
2103 unsigned char __user *up;
2104 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2105
2106 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2107 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2108 num_xfer = hp->dxfer_len;
2109 if (schp->bufflen < num_xfer)
2110 num_xfer = schp->bufflen;
2111 }
2112 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2113 (new_interface
2114 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2115 return 0;
2116
2117 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2118 num_xfer, iovec_count, schp->k_use_sg));
2119 if (iovec_count) {
2120 onum = iovec_count;
2121 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2122 return -EFAULT;
2123 } else
2124 onum = 1;
2125
45711f1a 2126 p = page_address(sg_page(sg));
d6b10348
MC		 2127 ksglen = sg->length;
2128 for (j = 0, k = 0; j < onum; ++j) {
2129 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2130 if (res)
2131 return res;
2132
b0f655d0 2133 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 2134 p = page_address(sg_page(sg))) {
d6b10348
MC		 2135 if (usglen <= 0)
2136 break;
2137 if (ksglen > usglen) {
2138 if (usglen >= num_xfer) {
2139 if (__copy_to_user(up, p, num_xfer))
1da177e4 2140 return -EFAULT;
d6b10348 2141 return 0;
1da177e4 2142 }
d6b10348
MC		 2143 if (__copy_to_user(up, p, usglen))
2144 return -EFAULT;
2145 p += usglen;
2146 ksglen -= usglen;
2147 break;
2148 } else {
2149 if (ksglen >= num_xfer) {
2150 if (__copy_to_user(up, p, num_xfer))
2151 return -EFAULT;
1da177e4 2152 return 0;
d6b10348
MC		 2153 }
2154 if (__copy_to_user(up, p, ksglen))
2155 return -EFAULT;
2156 up += ksglen;
2157 usglen -= ksglen;
1da177e4 2158 }
d6b10348
MC		 2159 ++k;
2160 if (k >= schp->k_use_sg)
2161 return 0;
1da177e4
LT		 2162 }
2163 }
d6b10348 2164
1da177e4
LT		 2165 return 0;
2166}
2167
2168static int
2169sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2170{
2171 Sg_scatter_hold *schp = &srp->data;
d6b10348
MC		 2172 struct scatterlist *sg = schp->buffer;
2173 int k, num;
1da177e4
LT		 2174
2175 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2176 num_read_xfer));
2177 if ((!outp) || (num_read_xfer <= 0))
2178 return 0;
d6b10348 2179
45711f1a 2180 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) {
d6b10348
MC		 2181 num = sg->length;
2182 if (num > num_read_xfer) {
45711f1a 2183 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2184 num_read_xfer))
2185 return -EFAULT;
2186 break;
2187 } else {
45711f1a 2188 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2189 num))
2190 return -EFAULT;
2191 num_read_xfer -= num;
2192 if (num_read_xfer <= 0)
1da177e4 2193 break;
d6b10348 2194 outp += num;
1da177e4 2195 }
1da177e4 2196 }
d6b10348 2197
1da177e4
LT		 2198 return 0;
2199}
2200
2201static void
2202sg_build_reserve(Sg_fd * sfp, int req_size)
2203{
2204 Sg_scatter_hold *schp = &sfp->reserve;
2205
2206 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2207 do {
2208 if (req_size < PAGE_SIZE)
2209 req_size = PAGE_SIZE;
2210 if (0 == sg_build_indirect(schp, sfp, req_size))
2211 return;
2212 else
2213 sg_remove_scat(schp);
2214 req_size >>= 1; /* divide by 2 */
2215 } while (req_size > (PAGE_SIZE / 2));
2216}
2217
2218static void
2219sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2220{
2221 Sg_scatter_hold *req_schp = &srp->data;
2222 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348
MC		 2223 struct scatterlist *sg = rsv_schp->buffer;
2224 int k, num, rem;
1da177e4
LT		 2225
2226 srp->res_used = 1;
2227 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 2228 rem = size;
d6b10348 2229
b0f655d0 2230 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
d6b10348
MC		 2231 num = sg->length;
2232 if (rem <= num) {
2233 sfp->save_scat_len = num;
2234 sg->length = rem;
2235 req_schp->k_use_sg = k + 1;
2236 req_schp->sglist_len = rsv_schp->sglist_len;
2237 req_schp->buffer = rsv_schp->buffer;
2238
2239 req_schp->bufflen = size;
2240 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2241 break;
2242 } else
2243 rem -= num;
1da177e4 2244 }
d6b10348
MC		 2245
2246 if (k >= rsv_schp->k_use_sg)
2247 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 2248}
2249
2250static void
2251sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2252{
2253 Sg_scatter_hold *req_schp = &srp->data;
2254 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2255
2256 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2257 (int) req_schp->k_use_sg));
2258 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
d6b10348 2259 struct scatterlist *sg = rsv_schp->buffer;
1da177e4
LT		 2260
2261 if (sfp->save_scat_len > 0)
d6b10348 2262 (sg + (req_schp->k_use_sg - 1))->length =
1da177e4
LT		 2263 (unsigned) sfp->save_scat_len;
2264 else
2265 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2266 }
2267 req_schp->k_use_sg = 0;
2268 req_schp->bufflen = 0;
2269 req_schp->buffer = NULL;
2270 req_schp->sglist_len = 0;
2271 sfp->save_scat_len = 0;
2272 srp->res_used = 0;
2273}
2274
2275static Sg_request *
2276sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2277{
2278 Sg_request *resp;
2279 unsigned long iflags;
2280
2281 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2282 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2283 /* look for requests that are ready + not SG_IO owned */
2284 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2285 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2286 resp->done = 2; /* guard against other readers */
2287 break;
2288 }
2289 }
2290 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2291 return resp;
2292}
2293
2294#ifdef CONFIG_SCSI_PROC_FS
2295static Sg_request *
2296sg_get_nth_request(Sg_fd * sfp, int nth)
2297{
2298 Sg_request *resp;
2299 unsigned long iflags;
2300 int k;
2301
2302 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2303 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2304 ++k, resp = resp->nextrp) ;
2305 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2306 return resp;
2307}
2308#endif
2309
2310/* always adds to end of list */
2311static Sg_request *
2312sg_add_request(Sg_fd * sfp)
2313{
2314 int k;
2315 unsigned long iflags;
2316 Sg_request *resp;
2317 Sg_request *rp = sfp->req_arr;
2318
2319 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2320 resp = sfp->headrp;
2321 if (!resp) {
2322 memset(rp, 0, sizeof (Sg_request));
2323 rp->parentfp = sfp;
2324 resp = rp;
2325 sfp->headrp = resp;
2326 } else {
2327 if (0 == sfp->cmd_q)
2328 resp = NULL; /* command queuing disallowed */
2329 else {
2330 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2331 if (!rp->parentfp)
2332 break;
2333 }
2334 if (k < SG_MAX_QUEUE) {
2335 memset(rp, 0, sizeof (Sg_request));
2336 rp->parentfp = sfp;
2337 while (resp->nextrp)
2338 resp = resp->nextrp;
2339 resp->nextrp = rp;
2340 resp = rp;
2341 } else
2342 resp = NULL;
2343 }
2344 }
2345 if (resp) {
2346 resp->nextrp = NULL;
cb59e840 2347 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2348 }
2349 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2350 return resp;
2351}
2352
2353/* Return of 1 for found; 0 for not found */
2354static int
2355sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2356{
2357 Sg_request *prev_rp;
2358 Sg_request *rp;
2359 unsigned long iflags;
2360 int res = 0;
2361
2362 if ((!sfp) || (!srp) || (!sfp->headrp))
2363 return res;
2364 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2365 prev_rp = sfp->headrp;
2366 if (srp == prev_rp) {
2367 sfp->headrp = prev_rp->nextrp;
2368 prev_rp->parentfp = NULL;
2369 res = 1;
2370 } else {
2371 while ((rp = prev_rp->nextrp)) {
2372 if (srp == rp) {
2373 prev_rp->nextrp = rp->nextrp;
2374 rp->parentfp = NULL;
2375 res = 1;
2376 break;
2377 }
2378 prev_rp = rp;
2379 }
2380 }
2381 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2382 return res;
2383}
2384
2385#ifdef CONFIG_SCSI_PROC_FS
2386static Sg_fd *
2387sg_get_nth_sfp(Sg_device * sdp, int nth)
2388{
2389 Sg_fd *resp;
2390 unsigned long iflags;
2391 int k;
2392
7c07d613 2393 read_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2394 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2395 ++k, resp = resp->nextfp) ;
7c07d613 2396 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2397 return resp;
2398}
2399#endif
2400
2401static Sg_fd *
2402sg_add_sfp(Sg_device * sdp, int dev)
2403{
2404 Sg_fd *sfp;
2405 unsigned long iflags;
44ec9542 2406 int bufflen;
1da177e4 2407
d6b10348 2408 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2409 if (!sfp)
2410 return NULL;
d6b10348 2411
1da177e4
LT		 2412 init_waitqueue_head(&sfp->read_wait);
2413 rwlock_init(&sfp->rq_list_lock);
2414
2415 sfp->timeout = SG_DEFAULT_TIMEOUT;
2416 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2417 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2418 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2419 sdp->device->host->unchecked_isa_dma : 1;
2420 sfp->cmd_q = SG_DEF_COMMAND_Q;
2421 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2422 sfp->parentdp = sdp;
7c07d613 2423 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2424 if (!sdp->headfp)
2425 sdp->headfp = sfp;
2426 else { /* add to tail of existing list */
2427 Sg_fd *pfp = sdp->headfp;
2428 while (pfp->nextfp)
2429 pfp = pfp->nextfp;
2430 pfp->nextfp = sfp;
2431 }
7c07d613 2432 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2433 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2434 if (unlikely(sg_big_buff != def_reserved_size))
2435 sg_big_buff = def_reserved_size;
2436
44ec9542
AS		 2437 bufflen = min_t(int, sg_big_buff,
2438 sdp->device->request_queue->max_sectors * 512);
2439 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2440 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2441 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2442 return sfp;
2443}
2444
2445static void
2446__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2447{
2448 Sg_fd *fp;
2449 Sg_fd *prev_fp;
2450
2451 prev_fp = sdp->headfp;
2452 if (sfp == prev_fp)
2453 sdp->headfp = prev_fp->nextfp;
2454 else {
2455 while ((fp = prev_fp->nextfp)) {
2456 if (sfp == fp) {
2457 prev_fp->nextfp = fp->nextfp;
2458 break;
2459 }
2460 prev_fp = fp;
2461 }
2462 }
2463 if (sfp->reserve.bufflen > 0) {
2464 SCSI_LOG_TIMEOUT(6,
2465 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2466 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2467 sg_remove_scat(&sfp->reserve);
2468 }
2469 sfp->parentdp = NULL;
2470 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2471 kfree(sfp);
1da177e4
LT		 2472}
2473
2474/* Returns 0 in normal case, 1 when detached and sdp object removed */
2475static int
2476sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2477{
2478 Sg_request *srp;
2479 Sg_request *tsrp;
2480 int dirty = 0;
2481 int res = 0;
2482
2483 for (srp = sfp->headrp; srp; srp = tsrp) {
2484 tsrp = srp->nextrp;
2485 if (sg_srp_done(srp, sfp))
2486 sg_finish_rem_req(srp);
2487 else
2488 ++dirty;
2489 }
2490 if (0 == dirty) {
2491 unsigned long iflags;
2492
7c07d613 2493 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2494 __sg_remove_sfp(sdp, sfp);
2495 if (sdp->detached && (NULL == sdp->headfp)) {
7c07d613
JB		 2496 idr_remove(&sg_index_idr, sdp->index);
2497 kfree(sdp);
1da177e4
LT		 2498 res = 1;
2499 }
7c07d613 2500 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2501 } else {
2502 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2503 /* only bump the access_count if we actually succeeded in
2504 * throwing another counter on the host module */
2505 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2506 sfp->closed = 1; /* flag dirty state on this fd */
2507 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2508 dirty));
2509 }
2510 return res;
2511}
2512
2513static int
2514sg_res_in_use(Sg_fd * sfp)
2515{
2516 const Sg_request *srp;
2517 unsigned long iflags;
2518
2519 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2520 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2521 if (srp->res_used)
2522 break;
2523 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2524 return srp ? 1 : 0;
2525}
2526
6460e75a 2527/* The size fetched (value output via retSzp) set when non-NULL return */
d6b10348 2528static struct page *
1da177e4
LT		 2529sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2530{
d6b10348 2531 struct page *resp = NULL;
c53033f6 2532 gfp_t page_mask;
1da177e4 2533 int order, a_size;
6460e75a 2534 int resSz;
1da177e4 2535
6460e75a 2536 if ((rqSz <= 0) || (NULL == retSzp))
1da177e4
LT		 2537 return resp;
2538
2539 if (lowDma)
f9aed0e2 2540 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
1da177e4 2541 else
f9aed0e2 2542 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4
LT		 2543
2544 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2545 order++, a_size <<= 1) ;
6460e75a 2546 resSz = a_size; /* rounded up if necessary */
d6b10348 2547 resp = alloc_pages(page_mask, order);
6460e75a 2548 while ((!resp) && order) {
1da177e4
LT		 2549 --order;
2550 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
d6b10348 2551 resp = alloc_pages(page_mask, order); /* try half */
1da177e4
LT		 2552 resSz = a_size;
2553 }
2554 if (resp) {
2555 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
41ed16fa 2556 memset(page_address(resp), 0, resSz);
6460e75a 2557 *retSzp = resSz;
1da177e4
LT		 2558 }
2559 return resp;
2560}
2561
2562static void
d6b10348 2563sg_page_free(struct page *page, int size)
1da177e4
LT		 2564{
2565 int order, a_size;
2566
d6b10348 2567 if (!page)
1da177e4
LT		 2568 return;
2569 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2570 order++, a_size <<= 1) ;
d6b10348 2571 __free_pages(page, order);
1da177e4
LT		 2572}
2573
1da177e4 2574#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2575static int
2576sg_idr_max_id(int id, void *p, void *data)
2577{
2578 int *k = data;
2579
2580 if (*k < id)
2581 *k = id;
2582
2583 return 0;
2584}
2585
1da177e4
LT		 2586static int
2587sg_last_dev(void)
2588{
53474c04 2589 int k = -1;
1da177e4
LT		 2590 unsigned long iflags;
2591
7c07d613
JB		 2592 read_lock_irqsave(&sg_index_lock, iflags);
2593 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2594 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2595 return k + 1; /* origin 1 */
2596}
2597#endif
2598
2599static Sg_device *
2600sg_get_dev(int dev)
2601{
7c07d613 2602 Sg_device *sdp;
1da177e4
LT		 2603 unsigned long iflags;
2604
7c07d613
JB		 2605 read_lock_irqsave(&sg_index_lock, iflags);
2606 sdp = idr_find(&sg_index_idr, dev);
2607 read_unlock_irqrestore(&sg_index_lock, iflags);
2608
1da177e4
LT		 2609 return sdp;
2610}
2611
2612#ifdef CONFIG_SCSI_PROC_FS
2613
2614static struct proc_dir_entry *sg_proc_sgp = NULL;
2615
2616static char sg_proc_sg_dirname[] = "scsi/sg";
2617
2618static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2619
2620static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2621static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2622 size_t count, loff_t *off);
2623static struct file_operations adio_fops = {
2624 /* .owner, .read and .llseek added in sg_proc_init() */
2625 .open = sg_proc_single_open_adio,
2626 .write = sg_proc_write_adio,
2627 .release = single_release,
2628};
2629
2630static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2631static ssize_t sg_proc_write_dressz(struct file *filp,
2632 const char __user *buffer, size_t count, loff_t *off);
2633static struct file_operations dressz_fops = {
2634 .open = sg_proc_single_open_dressz,
2635 .write = sg_proc_write_dressz,
2636 .release = single_release,
2637};
2638
2639static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2640static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2641static struct file_operations version_fops = {
2642 .open = sg_proc_single_open_version,
2643 .release = single_release,
2644};
2645
2646static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2647static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2648static struct file_operations devhdr_fops = {
2649 .open = sg_proc_single_open_devhdr,
2650 .release = single_release,
2651};
2652
2653static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2654static int sg_proc_open_dev(struct inode *inode, struct file *file);
2655static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2656static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2657static void dev_seq_stop(struct seq_file *s, void *v);
2658static struct file_operations dev_fops = {
2659 .open = sg_proc_open_dev,
2660 .release = seq_release,
2661};
2662static struct seq_operations dev_seq_ops = {
2663 .start = dev_seq_start,
2664 .next = dev_seq_next,
2665 .stop = dev_seq_stop,
2666 .show = sg_proc_seq_show_dev,
2667};
2668
2669static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2670static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2671static struct file_operations devstrs_fops = {
2672 .open = sg_proc_open_devstrs,
2673 .release = seq_release,
2674};
2675static struct seq_operations devstrs_seq_ops = {
2676 .start = dev_seq_start,
2677 .next = dev_seq_next,
2678 .stop = dev_seq_stop,
2679 .show = sg_proc_seq_show_devstrs,
2680};
2681
2682static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2683static int sg_proc_open_debug(struct inode *inode, struct file *file);
2684static struct file_operations debug_fops = {
2685 .open = sg_proc_open_debug,
2686 .release = seq_release,
2687};
2688static struct seq_operations debug_seq_ops = {
2689 .start = dev_seq_start,
2690 .next = dev_seq_next,
2691 .stop = dev_seq_stop,
2692 .show = sg_proc_seq_show_debug,
2693};
2694
2695
2696struct sg_proc_leaf {
2697 const char * name;
2698 struct file_operations * fops;
2699};
2700
2701static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2702 {"allow_dio", &adio_fops},
2703 {"debug", &debug_fops},
2704 {"def_reserved_size", &dressz_fops},
2705 {"device_hdr", &devhdr_fops},
2706 {"devices", &dev_fops},
2707 {"device_strs", &devstrs_fops},
2708 {"version", &version_fops}
2709};
2710
2711static int
2712sg_proc_init(void)
2713{
2714 int k, mask;
6391a113 2715 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2716 struct sg_proc_leaf * leaf;
2717
66600221 2718 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2719 if (!sg_proc_sgp)
2720 return 1;
2721 for (k = 0; k < num_leaves; ++k) {
2722 leaf = &sg_proc_leaf_arr[k];
2723 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
a973909f
DL		 2724 leaf->fops->owner = THIS_MODULE;
2725 leaf->fops->read = seq_read;
2726 leaf->fops->llseek = seq_lseek;
2727 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
1da177e4
LT		 2728 }
2729 return 0;
2730}
2731
2732static void
2733sg_proc_cleanup(void)
2734{
2735 int k;
6391a113 2736 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2737
2738 if (!sg_proc_sgp)
2739 return;
2740 for (k = 0; k < num_leaves; ++k)
2741 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2742 remove_proc_entry(sg_proc_sg_dirname, NULL);
2743}
2744
2745
2746static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2747{
2748 seq_printf(s, "%d\n", *((int *)s->private));
2749 return 0;
2750}
2751
2752static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2753{
2754 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2755}
2756
2757static ssize_t
2758sg_proc_write_adio(struct file *filp, const char __user *buffer,
2759 size_t count, loff_t *off)
2760{
2761 int num;
2762 char buff[11];
2763
2764 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2765 return -EACCES;
2766 num = (count < 10) ? count : 10;
2767 if (copy_from_user(buff, buffer, num))
2768 return -EFAULT;
2769 buff[num] = '\0';
2770 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2771 return count;
2772}
2773
2774static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2775{
2776 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2777}
2778
2779static ssize_t
2780sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2781 size_t count, loff_t *off)
2782{
2783 int num;
2784 unsigned long k = ULONG_MAX;
2785 char buff[11];
2786
2787 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2788 return -EACCES;
2789 num = (count < 10) ? count : 10;
2790 if (copy_from_user(buff, buffer, num))
2791 return -EFAULT;
2792 buff[num] = '\0';
2793 k = simple_strtoul(buff, NULL, 10);
2794 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2795 sg_big_buff = k;
2796 return count;
2797 }
2798 return -ERANGE;
2799}
2800
2801static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2802{
2803 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2804 sg_version_date);
2805 return 0;
2806}
2807
2808static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2809{
2810 return single_open(file, sg_proc_seq_show_version, NULL);
2811}
2812
2813static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2814{
2815 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2816 "online\n");
2817 return 0;
2818}
2819
2820static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2821{
2822 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2823}
2824
2825struct sg_proc_deviter {
2826 loff_t index;
2827 size_t max;
2828};
2829
2830static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2831{
2832 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2833
729d70f5 2834 s->private = it;
1da177e4
LT		 2835 if (! it)
2836 return NULL;
729d70f5 2837
1da177e4
LT		 2838 it->index = *pos;
2839 it->max = sg_last_dev();
2840 if (it->index >= it->max)
729d70f5 2841 return NULL;
1da177e4 2842 return it;
1da177e4
LT		 2843}
2844
2845static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2846{
729d70f5 2847 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2848
2849 *pos = ++it->index;
2850 return (it->index < it->max) ? it : NULL;
2851}
2852
2853static void dev_seq_stop(struct seq_file *s, void *v)
2854{
729d70f5 2855 kfree(s->private);
1da177e4
LT		 2856}
2857
2858static int sg_proc_open_dev(struct inode *inode, struct file *file)
2859{
2860 return seq_open(file, &dev_seq_ops);
2861}
2862
2863static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2864{
2865 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2866 Sg_device *sdp;
2867 struct scsi_device *scsidp;
2868
2869 sdp = it ? sg_get_dev(it->index) : NULL;
2870 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2871 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2872 scsidp->host->host_no, scsidp->channel,
2873 scsidp->id, scsidp->lun, (int) scsidp->type,
2874 1,
2875 (int) scsidp->queue_depth,
2876 (int) scsidp->device_busy,
2877 (int) scsi_device_online(scsidp));
2878 else
2879 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2880 return 0;
2881}
2882
2883static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2884{
2885 return seq_open(file, &devstrs_seq_ops);
2886}
2887
2888static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2889{
2890 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2891 Sg_device *sdp;
2892 struct scsi_device *scsidp;
2893
2894 sdp = it ? sg_get_dev(it->index) : NULL;
2895 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2896 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2897 scsidp->vendor, scsidp->model, scsidp->rev);
2898 else
2899 seq_printf(s, "<no active device>\n");
2900 return 0;
2901}
2902
2903static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2904{
2905 int k, m, new_interface, blen, usg;
2906 Sg_request *srp;
2907 Sg_fd *fp;
2908 const sg_io_hdr_t *hp;
2909 const char * cp;
cb59e840 2910 unsigned int ms;
1da177e4
LT		 2911
2912 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2913 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2914 "(res)sgat=%d low_dma=%d\n", k + 1,
2915 jiffies_to_msecs(fp->timeout),
2916 fp->reserve.bufflen,
2917 (int) fp->reserve.k_use_sg,
2918 (int) fp->low_dma);
2919 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2920 (int) fp->cmd_q, (int) fp->force_packid,
2921 (int) fp->keep_orphan, (int) fp->closed);
2922 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2923 hp = &srp->header;
2924 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2925 if (srp->res_used) {
2926 if (new_interface &&
2927 (SG_FLAG_MMAP_IO & hp->flags))
2928 cp = " mmap>> ";
2929 else
2930 cp = " rb>> ";
2931 } else {
2932 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2933 cp = " dio>> ";
2934 else
2935 cp = " ";
2936 }
2937 seq_printf(s, cp);
d6b10348
MC		 2938 blen = srp->data.bufflen;
2939 usg = srp->data.k_use_sg;
1da177e4
LT		 2940 seq_printf(s, srp->done ?
2941 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2942 : "act:");
1da177e4
LT		 2943 seq_printf(s, " id=%d blen=%d",
2944 srp->header.pack_id, blen);
2945 if (srp->done)
2946 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2947 else {
2948 ms = jiffies_to_msecs(jiffies);
1da177e4 2949 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2950 (new_interface ? hp->timeout :
2951 jiffies_to_msecs(fp->timeout)),
2952 (ms > hp->duration ? ms - hp->duration : 0));
2953 }
1da177e4
LT		 2954 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2955 (int) srp->data.cmd_opcode);
2956 }
2957 if (0 == m)
2958 seq_printf(s, " No requests active\n");
2959 }
2960}
2961
2962static int sg_proc_open_debug(struct inode *inode, struct file *file)
2963{
2964 return seq_open(file, &debug_seq_ops);
2965}
2966
2967static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2968{
2969 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2970 Sg_device *sdp;
2971
2972 if (it && (0 == it->index)) {
7c07d613
JB		 2973 seq_printf(s, "max_active_device=%d(origin 1)\n",
2974 (int)it->max);
1da177e4
LT		 2975 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2976 }
2977 sdp = it ? sg_get_dev(it->index) : NULL;
2978 if (sdp) {
2979 struct scsi_device *scsidp = sdp->device;
2980
2981 if (NULL == scsidp) {
2982 seq_printf(s, "device %d detached ??\n",
2983 (int)it->index);
2984 return 0;
2985 }
2986
2987 if (sg_get_nth_sfp(sdp, 0)) {
2988 seq_printf(s, " >>> device=%s ",
2989 sdp->disk->disk_name);
2990 if (sdp->detached)
2991 seq_printf(s, "detached pending close ");
2992 else
2993 seq_printf
2994 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2995 scsidp->host->host_no,
2996 scsidp->channel, scsidp->id,
2997 scsidp->lun,
2998 scsidp->host->hostt->emulated);
2999 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3000 sdp->sg_tablesize, sdp->exclude);
3001 }
3002 sg_proc_debug_helper(s, sdp);
3003 }
3004 return 0;
3005}
3006
3007#endif /* CONFIG_SCSI_PROC_FS */
3008
3009module_init(init_sg);
3010module_exit(exit_sg);
kernel source for telekom puls (alcatel/mediatek)