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[SCSI] sg: set class_data after success
[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>
1da177e4
LT		 51
52#include "scsi.h"
db9dff36 53#include <scsi/scsi_dbg.h>
1da177e4
LT		 54#include <scsi/scsi_host.h>
55#include <scsi/scsi_driver.h>
56#include <scsi/scsi_ioctl.h>
57#include <scsi/sg.h>
58
59#include "scsi_logging.h"
60
61#ifdef CONFIG_SCSI_PROC_FS
62#include <linux/proc_fs.h>
7ca63cb4 63static char *sg_version_date = "20061027";
1da177e4
LT		 64
65static int sg_proc_init(void);
66static void sg_proc_cleanup(void);
67#endif
68
1da177e4
LT		 69#define SG_ALLOW_DIO_DEF 0
70#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
71
72#define SG_MAX_DEVS 32768
73
74/*
75 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
76 * Then when using 32 bit integers x * m may overflow during the calculation.
77 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
78 * calculates the same, but prevents the overflow when both m and d
79 * are "small" numbers (like HZ and USER_HZ).
80 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
81 * in 32 bits.
82 */
83#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
84
85#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
86
87int sg_big_buff = SG_DEF_RESERVED_SIZE;
88/* N.B. This variable is readable and writeable via
89 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
90 of this size (or less if there is not enough memory) will be reserved
91 for use by this file descriptor. [Deprecated usage: this variable is also
92 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
93 the kernel (i.e. it is not a module).] */
94static int def_reserved_size = -1; /* picks up init parameter */
95static int sg_allow_dio = SG_ALLOW_DIO_DEF;
96
6460e75a
DG		 97static int scatter_elem_sz = SG_SCATTER_SZ;
98static int scatter_elem_sz_prev = SG_SCATTER_SZ;
99
1da177e4
LT		 100#define SG_SECTOR_SZ 512
101#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
102
d8539d81
DT		 103static int sg_add(struct class_device *, struct class_interface *);
104static void sg_remove(struct class_device *, struct class_interface *);
1da177e4 105
7c07d613
JB		 106static DEFINE_IDR(sg_index_idr);
107static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
1da177e4
LT		 108 file descriptor list for device */
109
110static struct class_interface sg_interface = {
111 .add = sg_add,
112 .remove = sg_remove,
113};
114
115typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
116 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
ea312552 117 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
1da177e4
LT		 118 unsigned bufflen; /* Size of (aggregate) data buffer */
119 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
d6b10348 120 struct scatterlist *buffer;/* scatter list */
1da177e4
LT		 121 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
122 unsigned char cmd_opcode; /* first byte of command */
123} Sg_scatter_hold;
124
125struct sg_device; /* forward declarations */
126struct sg_fd;
127
128typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
1da177e4
LT		 129 struct sg_request *nextrp; /* NULL -> tail request (slist) */
130 struct sg_fd *parentfp; /* NULL -> not in use */
131 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
132 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
d6b10348 133 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
1da177e4
LT		 134 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
135 char orphan; /* 1 -> drop on sight, 0 -> normal */
136 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
137 volatile char done; /* 0->before bh, 1->before read, 2->read */
138} Sg_request;
139
140typedef struct sg_fd { /* holds the state of a file descriptor */
141 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
142 struct sg_device *parentdp; /* owning device */
143 wait_queue_head_t read_wait; /* queue read until command done */
144 rwlock_t rq_list_lock; /* protect access to list in req_arr */
145 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
146 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
147 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
148 unsigned save_scat_len; /* original length of trunc. scat. element */
149 Sg_request *headrp; /* head of request slist, NULL->empty */
150 struct fasync_struct *async_qp; /* used by asynchronous notification */
151 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
152 char low_dma; /* as in parent but possibly overridden to 1 */
153 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
154 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
155 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
156 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
157 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
158 char mmap_called; /* 0 -> mmap() never called on this fd */
159} Sg_fd;
160
161typedef struct sg_device { /* holds the state of each scsi generic device */
162 struct scsi_device *device;
163 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
164 int sg_tablesize; /* adapter's max scatter-gather table size */
7c07d613 165 u32 index; /* device index number */
1da177e4
LT		 166 Sg_fd *headfp; /* first open fd belonging to this device */
167 volatile char detached; /* 0->attached, 1->detached pending removal */
168 volatile char exclude; /* opened for exclusive access */
169 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
170 struct gendisk *disk;
171 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
172} Sg_device;
173
174static int sg_fasync(int fd, struct file *filp, int mode);
d6b10348
MC		 175/* tasklet or soft irq callback */
176static void sg_cmd_done(void *data, char *sense, int result, int resid);
1da177e4
LT		 177static int sg_start_req(Sg_request * srp);
178static void sg_finish_rem_req(Sg_request * srp);
179static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
180static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
181 int tablesize);
182static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
183 Sg_request * srp);
184static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
185 int blocking, int read_only, Sg_request ** o_srp);
186static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
187 unsigned char *cmnd, int timeout, int blocking);
188static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
189 int wr_xf, int *countp, unsigned char __user **up);
190static int sg_write_xfer(Sg_request * srp);
191static int sg_read_xfer(Sg_request * srp);
192static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
193static void sg_remove_scat(Sg_scatter_hold * schp);
194static void sg_build_reserve(Sg_fd * sfp, int req_size);
195static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
196static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
d6b10348
MC		 197static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
198static void sg_page_free(struct page *page, int size);
1da177e4
LT		 199static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
200static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
201static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
202static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
203static Sg_request *sg_add_request(Sg_fd * sfp);
204static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
205static int sg_res_in_use(Sg_fd * sfp);
206static int sg_allow_access(unsigned char opcode, char dev_type);
207static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
208static Sg_device *sg_get_dev(int dev);
1da177e4
LT		 209#ifdef CONFIG_SCSI_PROC_FS
210static int sg_last_dev(void);
211#endif
212
1da177e4
LT		 213#define SZ_SG_HEADER sizeof(struct sg_header)
214#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
215#define SZ_SG_IOVEC sizeof(sg_iovec_t)
216#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
217
218static int
219sg_open(struct inode *inode, struct file *filp)
220{
221 int dev = iminor(inode);
222 int flags = filp->f_flags;
d6b10348 223 struct request_queue *q;
1da177e4
LT		 224 Sg_device *sdp;
225 Sg_fd *sfp;
226 int res;
227 int retval;
228
229 nonseekable_open(inode, filp);
230 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
231 sdp = sg_get_dev(dev);
232 if ((!sdp) || (!sdp->device))
233 return -ENXIO;
234 if (sdp->detached)
235 return -ENODEV;
236
237 /* This driver's module count bumped by fops_get in <linux/fs.h> */
238 /* Prevent the device driver from vanishing while we sleep */
239 retval = scsi_device_get(sdp->device);
240 if (retval)
241 return retval;
242
243 if (!((flags & O_NONBLOCK) ||
244 scsi_block_when_processing_errors(sdp->device))) {
245 retval = -ENXIO;
246 /* we are in error recovery for this device */
247 goto error_out;
248 }
249
250 if (flags & O_EXCL) {
251 if (O_RDONLY == (flags & O_ACCMODE)) {
252 retval = -EPERM; /* Can't lock it with read only access */
253 goto error_out;
254 }
255 if (sdp->headfp && (flags & O_NONBLOCK)) {
256 retval = -EBUSY;
257 goto error_out;
258 }
259 res = 0;
260 __wait_event_interruptible(sdp->o_excl_wait,
261 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
262 if (res) {
263 retval = res; /* -ERESTARTSYS because signal hit process */
264 goto error_out;
265 }
266 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
267 if (flags & O_NONBLOCK) {
268 retval = -EBUSY;
269 goto error_out;
270 }
271 res = 0;
272 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
273 res);
274 if (res) {
275 retval = res; /* -ERESTARTSYS because signal hit process */
276 goto error_out;
277 }
278 }
279 if (sdp->detached) {
280 retval = -ENODEV;
281 goto error_out;
282 }
283 if (!sdp->headfp) { /* no existing opens on this device */
284 sdp->sgdebug = 0;
d6b10348
MC		 285 q = sdp->device->request_queue;
286 sdp->sg_tablesize = min(q->max_hw_segments,
287 q->max_phys_segments);
1da177e4
LT		 288 }
289 if ((sfp = sg_add_sfp(sdp, dev)))
290 filp->private_data = sfp;
291 else {
292 if (flags & O_EXCL)
293 sdp->exclude = 0; /* undo if error */
294 retval = -ENOMEM;
295 goto error_out;
296 }
297 return 0;
298
299 error_out:
300 scsi_device_put(sdp->device);
301 return retval;
302}
303
304/* Following function was formerly called 'sg_close' */
305static int
306sg_release(struct inode *inode, struct file *filp)
307{
308 Sg_device *sdp;
309 Sg_fd *sfp;
310
311 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
312 return -ENXIO;
313 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
314 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
315 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
316 if (!sdp->detached) {
317 scsi_device_put(sdp->device);
318 }
319 sdp->exclude = 0;
320 wake_up_interruptible(&sdp->o_excl_wait);
321 }
322 return 0;
323}
324
325static ssize_t
326sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
327{
1da177e4
LT		 328 Sg_device *sdp;
329 Sg_fd *sfp;
330 Sg_request *srp;
331 int req_pack_id = -1;
1da177e4 332 sg_io_hdr_t *hp;
cb59e840
DG		 333 struct sg_header *old_hdr = NULL;
334 int retval = 0;
1da177e4
LT		 335
336 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
337 return -ENXIO;
338 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
339 sdp->disk->disk_name, (int) count));
d6b10348 340
1da177e4
LT		 341 if (!access_ok(VERIFY_WRITE, buf, count))
342 return -EFAULT;
343 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
cb59e840
DG		 344 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
345 if (!old_hdr)
346 return -ENOMEM;
347 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
348 retval = -EFAULT;
349 goto free_old_hdr;
350 }
351 if (old_hdr->reply_len < 0) {
1da177e4 352 if (count >= SZ_SG_IO_HDR) {
cb59e840
DG		 353 sg_io_hdr_t *new_hdr;
354 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
355 if (!new_hdr) {
356 retval = -ENOMEM;
357 goto free_old_hdr;
358 }
359 retval =__copy_from_user
360 (new_hdr, buf, SZ_SG_IO_HDR);
361 req_pack_id = new_hdr->pack_id;
362 kfree(new_hdr);
363 if (retval) {
364 retval = -EFAULT;
365 goto free_old_hdr;
366 }
1da177e4
LT		 367 }
368 } else
cb59e840 369 req_pack_id = old_hdr->pack_id;
1da177e4
LT		 370 }
371 srp = sg_get_rq_mark(sfp, req_pack_id);
372 if (!srp) { /* now wait on packet to arrive */
cb59e840
DG		 373 if (sdp->detached) {
374 retval = -ENODEV;
375 goto free_old_hdr;
376 }
377 if (filp->f_flags & O_NONBLOCK) {
378 retval = -EAGAIN;
379 goto free_old_hdr;
380 }
1da177e4 381 while (1) {
cb59e840 382 retval = 0; /* following macro beats race condition */
1da177e4 383 __wait_event_interruptible(sfp->read_wait,
cb59e840
DG		 384 (sdp->detached ||
385 (srp = sg_get_rq_mark(sfp, req_pack_id))),
386 retval);
387 if (sdp->detached) {
388 retval = -ENODEV;
389 goto free_old_hdr;
390 }
391 if (0 == retval)
1da177e4 392 break;
cb59e840
DG		 393
394 /* -ERESTARTSYS as signal hit process */
395 goto free_old_hdr;
1da177e4
LT		 396 }
397 }
cb59e840
DG		 398 if (srp->header.interface_id != '\0') {
399 retval = sg_new_read(sfp, buf, count, srp);
400 goto free_old_hdr;
401 }
1da177e4
LT		 402
403 hp = &srp->header;
cb59e840
DG		 404 if (old_hdr == NULL) {
405 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
406 if (! old_hdr) {
407 retval = -ENOMEM;
408 goto free_old_hdr;
409 }
410 }
411 memset(old_hdr, 0, SZ_SG_HEADER);
412 old_hdr->reply_len = (int) hp->timeout;
413 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
414 old_hdr->pack_id = hp->pack_id;
415 old_hdr->twelve_byte =
1da177e4 416 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
cb59e840
DG		 417 old_hdr->target_status = hp->masked_status;
418 old_hdr->host_status = hp->host_status;
419 old_hdr->driver_status = hp->driver_status;
1da177e4
LT		 420 if ((CHECK_CONDITION & hp->masked_status) ||
421 (DRIVER_SENSE & hp->driver_status))
cb59e840
DG		 422 memcpy(old_hdr->sense_buffer, srp->sense_b,
423 sizeof (old_hdr->sense_buffer));
1da177e4
LT		 424 switch (hp->host_status) {
425 /* This setup of 'result' is for backward compatibility and is best
426 ignored by the user who should use target, host + driver status */
427 case DID_OK:
428 case DID_PASSTHROUGH:
429 case DID_SOFT_ERROR:
cb59e840 430 old_hdr->result = 0;
1da177e4
LT		 431 break;
432 case DID_NO_CONNECT:
433 case DID_BUS_BUSY:
434 case DID_TIME_OUT:
cb59e840 435 old_hdr->result = EBUSY;
1da177e4
LT		 436 break;
437 case DID_BAD_TARGET:
438 case DID_ABORT:
439 case DID_PARITY:
440 case DID_RESET:
441 case DID_BAD_INTR:
cb59e840 442 old_hdr->result = EIO;
1da177e4
LT		 443 break;
444 case DID_ERROR:
cb59e840 445 old_hdr->result = (srp->sense_b[0] == 0 &&
1da177e4
LT		 446 hp->masked_status == GOOD) ? 0 : EIO;
447 break;
448 default:
cb59e840 449 old_hdr->result = EIO;
1da177e4
LT		 450 break;
451 }
452
453 /* Now copy the result back to the user buffer. */
454 if (count >= SZ_SG_HEADER) {
cb59e840
DG		 455 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
456 retval = -EFAULT;
457 goto free_old_hdr;
458 }
1da177e4 459 buf += SZ_SG_HEADER;
cb59e840
DG		 460 if (count > old_hdr->reply_len)
461 count = old_hdr->reply_len;
1da177e4 462 if (count > SZ_SG_HEADER) {
cb59e840
DG		 463 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
464 retval = -EFAULT;
465 goto free_old_hdr;
466 }
1da177e4
LT		 467 }
468 } else
cb59e840 469 count = (old_hdr->result == 0) ? 0 : -EIO;
1da177e4 470 sg_finish_rem_req(srp);
cb59e840
DG		 471 retval = count;
472free_old_hdr:
c9475cb0 473 kfree(old_hdr);
cb59e840 474 return retval;
1da177e4
LT		 475}
476
477static ssize_t
478sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
479{
480 sg_io_hdr_t *hp = &srp->header;
481 int err = 0;
482 int len;
483
484 if (count < SZ_SG_IO_HDR) {
485 err = -EINVAL;
486 goto err_out;
487 }
488 hp->sb_len_wr = 0;
489 if ((hp->mx_sb_len > 0) && hp->sbp) {
490 if ((CHECK_CONDITION & hp->masked_status) ||
491 (DRIVER_SENSE & hp->driver_status)) {
d6b10348 492 int sb_len = SCSI_SENSE_BUFFERSIZE;
1da177e4
LT		 493 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
494 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
495 len = (len > sb_len) ? sb_len : len;
496 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
497 err = -EFAULT;
498 goto err_out;
499 }
500 hp->sb_len_wr = len;
501 }
502 }
503 if (hp->masked_status || hp->host_status || hp->driver_status)
504 hp->info |= SG_INFO_CHECK;
505 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
506 err = -EFAULT;
507 goto err_out;
508 }
509 err = sg_read_xfer(srp);
510 err_out:
511 sg_finish_rem_req(srp);
512 return (0 == err) ? count : err;
513}
514
515static ssize_t
516sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
517{
518 int mxsize, cmd_size, k;
519 int input_size, blocking;
520 unsigned char opcode;
521 Sg_device *sdp;
522 Sg_fd *sfp;
523 Sg_request *srp;
524 struct sg_header old_hdr;
525 sg_io_hdr_t *hp;
d6b10348 526 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 527
528 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
529 return -ENXIO;
530 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
531 sdp->disk->disk_name, (int) count));
532 if (sdp->detached)
533 return -ENODEV;
534 if (!((filp->f_flags & O_NONBLOCK) ||
535 scsi_block_when_processing_errors(sdp->device)))
536 return -ENXIO;
537
538 if (!access_ok(VERIFY_READ, buf, count))
539 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
540 if (count < SZ_SG_HEADER)
541 return -EIO;
542 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
543 return -EFAULT;
544 blocking = !(filp->f_flags & O_NONBLOCK);
545 if (old_hdr.reply_len < 0)
546 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
547 if (count < (SZ_SG_HEADER + 6))
548 return -EIO; /* The minimum scsi command length is 6 bytes. */
549
550 if (!(srp = sg_add_request(sfp))) {
551 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
552 return -EDOM;
553 }
554 buf += SZ_SG_HEADER;
555 __get_user(opcode, buf);
556 if (sfp->next_cmd_len > 0) {
557 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
558 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
559 sfp->next_cmd_len = 0;
560 sg_remove_request(sfp, srp);
561 return -EIO;
562 }
563 cmd_size = sfp->next_cmd_len;
564 sfp->next_cmd_len = 0; /* reset so only this write() effected */
565 } else {
566 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
567 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
568 cmd_size = 12;
569 }
570 SCSI_LOG_TIMEOUT(4, printk(
571 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
572/* Determine buffer size. */
573 input_size = count - cmd_size;
574 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
575 mxsize -= SZ_SG_HEADER;
576 input_size -= SZ_SG_HEADER;
577 if (input_size < 0) {
578 sg_remove_request(sfp, srp);
579 return -EIO; /* User did not pass enough bytes for this command. */
580 }
581 hp = &srp->header;
582 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
583 hp->cmd_len = (unsigned char) cmd_size;
584 hp->iovec_count = 0;
585 hp->mx_sb_len = 0;
586 if (input_size > 0)
587 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
588 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
589 else
590 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
591 hp->dxfer_len = mxsize;
592 hp->dxferp = (char __user *)buf + cmd_size;
593 hp->sbp = NULL;
594 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
595 hp->flags = input_size; /* structure abuse ... */
596 hp->pack_id = old_hdr.pack_id;
597 hp->usr_ptr = NULL;
598 if (__copy_from_user(cmnd, buf, cmd_size))
599 return -EFAULT;
600 /*
601 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
602 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
603 * is a non-zero input_size, so emit a warning.
604 */
eaa3e22e
AK		 605 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) {
606 static char cmd[TASK_COMM_LEN];
607 if (strcmp(current->comm, cmd) && printk_ratelimit()) {
1da177e4
LT		 608 printk(KERN_WARNING
609 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
610 "guessing data in;\n" KERN_WARNING " "
611 "program %s not setting count and/or reply_len properly\n",
612 old_hdr.reply_len - (int)SZ_SG_HEADER,
613 input_size, (unsigned int) cmnd[0],
614 current->comm);
eaa3e22e
AK		 615 strcpy(cmd, current->comm);
616 }
617 }
1da177e4
LT		 618 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
619 return (k < 0) ? k : count;
620}
621
622static ssize_t
623sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
624 int blocking, int read_only, Sg_request ** o_srp)
625{
626 int k;
627 Sg_request *srp;
628 sg_io_hdr_t *hp;
d6b10348 629 unsigned char cmnd[MAX_COMMAND_SIZE];
1da177e4
LT		 630 int timeout;
631 unsigned long ul_timeout;
632
633 if (count < SZ_SG_IO_HDR)
634 return -EINVAL;
635 if (!access_ok(VERIFY_READ, buf, count))
636 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
637
638 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
639 if (!(srp = sg_add_request(sfp))) {
640 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
641 return -EDOM;
642 }
643 hp = &srp->header;
644 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
645 sg_remove_request(sfp, srp);
646 return -EFAULT;
647 }
648 if (hp->interface_id != 'S') {
649 sg_remove_request(sfp, srp);
650 return -ENOSYS;
651 }
652 if (hp->flags & SG_FLAG_MMAP_IO) {
653 if (hp->dxfer_len > sfp->reserve.bufflen) {
654 sg_remove_request(sfp, srp);
655 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
656 }
657 if (hp->flags & SG_FLAG_DIRECT_IO) {
658 sg_remove_request(sfp, srp);
659 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
660 }
661 if (sg_res_in_use(sfp)) {
662 sg_remove_request(sfp, srp);
663 return -EBUSY; /* reserve buffer already being used */
664 }
665 }
666 ul_timeout = msecs_to_jiffies(srp->header.timeout);
667 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
668 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
669 sg_remove_request(sfp, srp);
670 return -EMSGSIZE;
671 }
672 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
673 sg_remove_request(sfp, srp);
674 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
675 }
676 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
677 sg_remove_request(sfp, srp);
678 return -EFAULT;
679 }
680 if (read_only &&
681 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
682 sg_remove_request(sfp, srp);
683 return -EPERM;
684 }
685 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
686 if (k < 0)
687 return k;
688 if (o_srp)
689 *o_srp = srp;
690 return count;
691}
692
693static int
694sg_common_write(Sg_fd * sfp, Sg_request * srp,
695 unsigned char *cmnd, int timeout, int blocking)
696{
d6b10348 697 int k, data_dir;
1da177e4
LT		 698 Sg_device *sdp = sfp->parentdp;
699 sg_io_hdr_t *hp = &srp->header;
1da177e4
LT		 700
701 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
702 hp->status = 0;
703 hp->masked_status = 0;
704 hp->msg_status = 0;
705 hp->info = 0;
706 hp->host_status = 0;
707 hp->driver_status = 0;
708 hp->resid = 0;
709 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
710 (int) cmnd[0], (int) hp->cmd_len));
711
712 if ((k = sg_start_req(srp))) {
7ca63cb4 713 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
1da177e4
LT		 714 sg_finish_rem_req(srp);
715 return k; /* probably out of space --> ENOMEM */
716 }
717 if ((k = sg_write_xfer(srp))) {
7ca63cb4 718 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
1da177e4
LT		 719 sg_finish_rem_req(srp);
720 return k;
721 }
722 if (sdp->detached) {
723 sg_finish_rem_req(srp);
724 return -ENODEV;
725 }
1da177e4 726
1da177e4
LT		 727 switch (hp->dxfer_direction) {
728 case SG_DXFER_TO_FROM_DEV:
729 case SG_DXFER_FROM_DEV:
d6b10348 730 data_dir = DMA_FROM_DEVICE;
1da177e4
LT		 731 break;
732 case SG_DXFER_TO_DEV:
d6b10348 733 data_dir = DMA_TO_DEVICE;
1da177e4
LT		 734 break;
735 case SG_DXFER_UNKNOWN:
d6b10348 736 data_dir = DMA_BIDIRECTIONAL;
1da177e4
LT		 737 break;
738 default:
d6b10348 739 data_dir = DMA_NONE;
1da177e4
LT		 740 break;
741 }
cb59e840 742 hp->duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 743/* Now send everything of to mid-level. The next time we hear about this
744 packet is when sg_cmd_done() is called (i.e. a callback). */
bb1d1073 745 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
d6b10348
MC		 746 hp->dxfer_len, srp->data.k_use_sg, timeout,
747 SG_DEFAULT_RETRIES, srp, sg_cmd_done,
748 GFP_ATOMIC)) {
7ca63cb4 749 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
d6b10348
MC		 750 /*
751 * most likely out of mem, but could also be a bad map
752 */
18c49b8c 753 sg_finish_rem_req(srp);
d6b10348
MC		 754 return -ENOMEM;
755 } else
756 return 0;
1da177e4
LT		 757}
758
759static int
760sg_srp_done(Sg_request *srp, Sg_fd *sfp)
761{
762 unsigned long iflags;
763 int done;
764
765 read_lock_irqsave(&sfp->rq_list_lock, iflags);
766 done = srp->done;
767 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
768 return done;
769}
770
771static int
772sg_ioctl(struct inode *inode, struct file *filp,
773 unsigned int cmd_in, unsigned long arg)
774{
775 void __user *p = (void __user *)arg;
776 int __user *ip = p;
777 int result, val, read_only;
778 Sg_device *sdp;
779 Sg_fd *sfp;
780 Sg_request *srp;
781 unsigned long iflags;
782
783 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
784 return -ENXIO;
785 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
786 sdp->disk->disk_name, (int) cmd_in));
787 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
788
789 switch (cmd_in) {
790 case SG_IO:
791 {
792 int blocking = 1; /* ignore O_NONBLOCK flag */
793
794 if (sdp->detached)
795 return -ENODEV;
796 if (!scsi_block_when_processing_errors(sdp->device))
797 return -ENXIO;
798 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
799 return -EFAULT;
800 result =
801 sg_new_write(sfp, p, SZ_SG_IO_HDR,
802 blocking, read_only, &srp);
803 if (result < 0)
804 return result;
805 srp->sg_io_owned = 1;
806 while (1) {
807 result = 0; /* following macro to beat race condition */
808 __wait_event_interruptible(sfp->read_wait,
809 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
810 result);
811 if (sdp->detached)
812 return -ENODEV;
813 if (sfp->closed)
814 return 0; /* request packet dropped already */
815 if (0 == result)
816 break;
817 srp->orphan = 1;
818 return result; /* -ERESTARTSYS because signal hit process */
819 }
820 write_lock_irqsave(&sfp->rq_list_lock, iflags);
821 srp->done = 2;
822 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
823 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
824 return (result < 0) ? result : 0;
825 }
826 case SG_SET_TIMEOUT:
827 result = get_user(val, ip);
828 if (result)
829 return result;
830 if (val < 0)
831 return -EIO;
832 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
833 val = MULDIV (INT_MAX, USER_HZ, HZ);
834 sfp->timeout_user = val;
835 sfp->timeout = MULDIV (val, HZ, USER_HZ);
836
837 return 0;
838 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
839 /* strange ..., for backward compatibility */
840 return sfp->timeout_user;
841 case SG_SET_FORCE_LOW_DMA:
842 result = get_user(val, ip);
843 if (result)
844 return result;
845 if (val) {
846 sfp->low_dma = 1;
847 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
848 val = (int) sfp->reserve.bufflen;
849 sg_remove_scat(&sfp->reserve);
850 sg_build_reserve(sfp, val);
851 }
852 } else {
853 if (sdp->detached)
854 return -ENODEV;
855 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
856 }
857 return 0;
858 case SG_GET_LOW_DMA:
859 return put_user((int) sfp->low_dma, ip);
860 case SG_GET_SCSI_ID:
861 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
862 return -EFAULT;
863 else {
864 sg_scsi_id_t __user *sg_idp = p;
865
866 if (sdp->detached)
867 return -ENODEV;
868 __put_user((int) sdp->device->host->host_no,
869 &sg_idp->host_no);
870 __put_user((int) sdp->device->channel,
871 &sg_idp->channel);
872 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
873 __put_user((int) sdp->device->lun, &sg_idp->lun);
874 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
875 __put_user((short) sdp->device->host->cmd_per_lun,
876 &sg_idp->h_cmd_per_lun);
877 __put_user((short) sdp->device->queue_depth,
878 &sg_idp->d_queue_depth);
879 __put_user(0, &sg_idp->unused[0]);
880 __put_user(0, &sg_idp->unused[1]);
881 return 0;
882 }
883 case SG_SET_FORCE_PACK_ID:
884 result = get_user(val, ip);
885 if (result)
886 return result;
887 sfp->force_packid = val ? 1 : 0;
888 return 0;
889 case SG_GET_PACK_ID:
890 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
891 return -EFAULT;
892 read_lock_irqsave(&sfp->rq_list_lock, iflags);
893 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
894 if ((1 == srp->done) && (!srp->sg_io_owned)) {
895 read_unlock_irqrestore(&sfp->rq_list_lock,
896 iflags);
897 __put_user(srp->header.pack_id, ip);
898 return 0;
899 }
900 }
901 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
902 __put_user(-1, ip);
903 return 0;
904 case SG_GET_NUM_WAITING:
905 read_lock_irqsave(&sfp->rq_list_lock, iflags);
906 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
907 if ((1 == srp->done) && (!srp->sg_io_owned))
908 ++val;
909 }
910 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
911 return put_user(val, ip);
912 case SG_GET_SG_TABLESIZE:
913 return put_user(sdp->sg_tablesize, ip);
914 case SG_SET_RESERVED_SIZE:
915 result = get_user(val, ip);
916 if (result)
917 return result;
918 if (val < 0)
919 return -EINVAL;
44ec9542
AS		 920 val = min_t(int, val,
921 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 922 if (val != sfp->reserve.bufflen) {
923 if (sg_res_in_use(sfp) || sfp->mmap_called)
924 return -EBUSY;
925 sg_remove_scat(&sfp->reserve);
926 sg_build_reserve(sfp, val);
927 }
928 return 0;
929 case SG_GET_RESERVED_SIZE:
44ec9542
AS		 930 val = min_t(int, sfp->reserve.bufflen,
931 sdp->device->request_queue->max_sectors * 512);
1da177e4
LT		 932 return put_user(val, ip);
933 case SG_SET_COMMAND_Q:
934 result = get_user(val, ip);
935 if (result)
936 return result;
937 sfp->cmd_q = val ? 1 : 0;
938 return 0;
939 case SG_GET_COMMAND_Q:
940 return put_user((int) sfp->cmd_q, ip);
941 case SG_SET_KEEP_ORPHAN:
942 result = get_user(val, ip);
943 if (result)
944 return result;
945 sfp->keep_orphan = val;
946 return 0;
947 case SG_GET_KEEP_ORPHAN:
948 return put_user((int) sfp->keep_orphan, ip);
949 case SG_NEXT_CMD_LEN:
950 result = get_user(val, ip);
951 if (result)
952 return result;
953 sfp->next_cmd_len = (val > 0) ? val : 0;
954 return 0;
955 case SG_GET_VERSION_NUM:
956 return put_user(sg_version_num, ip);
957 case SG_GET_ACCESS_COUNT:
958 /* faked - we don't have a real access count anymore */
959 val = (sdp->device ? 1 : 0);
960 return put_user(val, ip);
961 case SG_GET_REQUEST_TABLE:
962 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
963 return -EFAULT;
964 else {
cb59e840
DG		 965 sg_req_info_t *rinfo;
966 unsigned int ms;
967
968 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
969 GFP_KERNEL);
970 if (!rinfo)
971 return -ENOMEM;
1da177e4
LT		 972 read_lock_irqsave(&sfp->rq_list_lock, iflags);
973 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
974 ++val, srp = srp ? srp->nextrp : srp) {
975 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
976 if (srp) {
977 rinfo[val].req_state = srp->done + 1;
978 rinfo[val].problem =
979 srp->header.masked_status &
980 srp->header.host_status &
981 srp->header.driver_status;
cb59e840
DG		 982 if (srp->done)
983 rinfo[val].duration =
984 srp->header.duration;
985 else {
986 ms = jiffies_to_msecs(jiffies);
987 rinfo[val].duration =
988 (ms > srp->header.duration) ?
989 (ms - srp->header.duration) : 0;
990 }
1da177e4 991 rinfo[val].orphan = srp->orphan;
cb59e840
DG		 992 rinfo[val].sg_io_owned =
993 srp->sg_io_owned;
994 rinfo[val].pack_id =
995 srp->header.pack_id;
996 rinfo[val].usr_ptr =
997 srp->header.usr_ptr;
1da177e4
LT		 998 }
999 }
1000 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
cb59e840
DG		 1001 result = __copy_to_user(p, rinfo,
1002 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1003 result = result ? -EFAULT : 0;
1004 kfree(rinfo);
1005 return result;
1da177e4
LT		 1006 }
1007 case SG_EMULATED_HOST:
1008 if (sdp->detached)
1009 return -ENODEV;
1010 return put_user(sdp->device->host->hostt->emulated, ip);
1011 case SG_SCSI_RESET:
1012 if (sdp->detached)
1013 return -ENODEV;
1014 if (filp->f_flags & O_NONBLOCK) {
939647ee 1015 if (scsi_host_in_recovery(sdp->device->host))
1da177e4
LT		 1016 return -EBUSY;
1017 } else if (!scsi_block_when_processing_errors(sdp->device))
1018 return -EBUSY;
1019 result = get_user(val, ip);
1020 if (result)
1021 return result;
1022 if (SG_SCSI_RESET_NOTHING == val)
1023 return 0;
1024 switch (val) {
1025 case SG_SCSI_RESET_DEVICE:
1026 val = SCSI_TRY_RESET_DEVICE;
1027 break;
1028 case SG_SCSI_RESET_BUS:
1029 val = SCSI_TRY_RESET_BUS;
1030 break;
1031 case SG_SCSI_RESET_HOST:
1032 val = SCSI_TRY_RESET_HOST;
1033 break;
1034 default:
1035 return -EINVAL;
1036 }
1037 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1038 return -EACCES;
1039 return (scsi_reset_provider(sdp->device, val) ==
1040 SUCCESS) ? 0 : -EIO;
1041 case SCSI_IOCTL_SEND_COMMAND:
1042 if (sdp->detached)
1043 return -ENODEV;
1044 if (read_only) {
1045 unsigned char opcode = WRITE_6;
1046 Scsi_Ioctl_Command __user *siocp = p;
1047
1048 if (copy_from_user(&opcode, siocp->data, 1))
1049 return -EFAULT;
1050 if (!sg_allow_access(opcode, sdp->device->type))
1051 return -EPERM;
1052 }
21b2f0c8 1053 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
1da177e4
LT		 1054 case SG_SET_DEBUG:
1055 result = get_user(val, ip);
1056 if (result)
1057 return result;
1058 sdp->sgdebug = (char) val;
1059 return 0;
1060 case SCSI_IOCTL_GET_IDLUN:
1061 case SCSI_IOCTL_GET_BUS_NUMBER:
1062 case SCSI_IOCTL_PROBE_HOST:
1063 case SG_GET_TRANSFORM:
1064 if (sdp->detached)
1065 return -ENODEV;
1066 return scsi_ioctl(sdp->device, cmd_in, p);
44ec9542
AS		 1067 case BLKSECTGET:
1068 return put_user(sdp->device->request_queue->max_sectors * 512,
1069 ip);
1da177e4
LT		 1070 default:
1071 if (read_only)
1072 return -EPERM; /* don't know so take safe approach */
1073 return scsi_ioctl(sdp->device, cmd_in, p);
1074 }
1075}
1076
1077#ifdef CONFIG_COMPAT
1078static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1079{
1080 Sg_device *sdp;
1081 Sg_fd *sfp;
1082 struct scsi_device *sdev;
1083
1084 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1085 return -ENXIO;
1086
1087 sdev = sdp->device;
1088 if (sdev->host->hostt->compat_ioctl) {
1089 int ret;
1090
1091 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1092
1093 return ret;
1094 }
1095
1096 return -ENOIOCTLCMD;
1097}
1098#endif
1099
1100static unsigned int
1101sg_poll(struct file *filp, poll_table * wait)
1102{
1103 unsigned int res = 0;
1104 Sg_device *sdp;
1105 Sg_fd *sfp;
1106 Sg_request *srp;
1107 int count = 0;
1108 unsigned long iflags;
1109
1110 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1111 || sfp->closed)
1112 return POLLERR;
1113 poll_wait(filp, &sfp->read_wait, wait);
1114 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1115 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1116 /* if any read waiting, flag it */
1117 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1118 res = POLLIN | POLLRDNORM;
1119 ++count;
1120 }
1121 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1122
1123 if (sdp->detached)
1124 res |= POLLHUP;
1125 else if (!sfp->cmd_q) {
1126 if (0 == count)
1127 res |= POLLOUT | POLLWRNORM;
1128 } else if (count < SG_MAX_QUEUE)
1129 res |= POLLOUT | POLLWRNORM;
1130 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1131 sdp->disk->disk_name, (int) res));
1132 return res;
1133}
1134
1135static int
1136sg_fasync(int fd, struct file *filp, int mode)
1137{
1138 int retval;
1139 Sg_device *sdp;
1140 Sg_fd *sfp;
1141
1142 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1143 return -ENXIO;
1144 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1145 sdp->disk->disk_name, mode));
1146
1147 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1148 return (retval < 0) ? retval : 0;
1149}
1150
1da177e4
LT		 1151static struct page *
1152sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1153{
1154 Sg_fd *sfp;
1155 struct page *page = NOPAGE_SIGBUS;
d6b10348 1156 unsigned long offset, len, sa;
1da177e4 1157 Sg_scatter_hold *rsv_schp;
d6b10348
MC		 1158 struct scatterlist *sg;
1159 int k;
1da177e4
LT		 1160
1161 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1162 return page;
1163 rsv_schp = &sfp->reserve;
1164 offset = addr - vma->vm_start;
1165 if (offset >= rsv_schp->bufflen)
1166 return page;
1167 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1168 offset, rsv_schp->k_use_sg));
d6b10348
MC		 1169 sg = rsv_schp->buffer;
1170 sa = vma->vm_start;
1171 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
b0f655d0 1172 ++k, sg = sg_next(sg)) {
d6b10348
MC		 1173 len = vma->vm_end - sa;
1174 len = (len < sg->length) ? len : sg->length;
1175 if (offset < len) {
45711f1a 1176 page = virt_to_page(page_address(sg_page(sg)) + offset);
d6b10348
MC		 1177 get_page(page); /* increment page count */
1178 break;
1da177e4 1179 }
d6b10348
MC		 1180 sa += len;
1181 offset -= len;
1da177e4 1182 }
d6b10348 1183
1da177e4
LT		 1184 if (type)
1185 *type = VM_FAULT_MINOR;
1186 return page;
1187}
1188
1189static struct vm_operations_struct sg_mmap_vm_ops = {
1190 .nopage = sg_vma_nopage,
1191};
1192
1193static int
1194sg_mmap(struct file *filp, struct vm_area_struct *vma)
1195{
1196 Sg_fd *sfp;
d6b10348 1197 unsigned long req_sz, len, sa;
1da177e4 1198 Sg_scatter_hold *rsv_schp;
d6b10348
MC		 1199 int k;
1200 struct scatterlist *sg;
1da177e4
LT		 1201
1202 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1203 return -ENXIO;
cb59e840 1204 req_sz = vma->vm_end - vma->vm_start;
1da177e4
LT		 1205 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1206 (void *) vma->vm_start, (int) req_sz));
1207 if (vma->vm_pgoff)
1208 return -EINVAL; /* want no offset */
1209 rsv_schp = &sfp->reserve;
1210 if (req_sz > rsv_schp->bufflen)
1211 return -ENOMEM; /* cannot map more than reserved buffer */
1212
d6b10348
MC		 1213 sa = vma->vm_start;
1214 sg = rsv_schp->buffer;
1215 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
b0f655d0 1216 ++k, sg = sg_next(sg)) {
d6b10348
MC		 1217 len = vma->vm_end - sa;
1218 len = (len < sg->length) ? len : sg->length;
1219 sa += len;
1da177e4 1220 }
d6b10348 1221
f9aed0e2 1222 sfp->mmap_called = 1;
1c8e71d7 1223 vma->vm_flags |= VM_RESERVED;
1da177e4
LT		 1224 vma->vm_private_data = sfp;
1225 vma->vm_ops = &sg_mmap_vm_ops;
1226 return 0;
1227}
1228
1229/* This function is a "bottom half" handler that is called by the
1230 * mid level when a command is completed (or has failed). */
1231static void
d6b10348 1232sg_cmd_done(void *data, char *sense, int result, int resid)
1da177e4 1233{
d6b10348 1234 Sg_request *srp = data;
1da177e4
LT		 1235 Sg_device *sdp = NULL;
1236 Sg_fd *sfp;
1da177e4 1237 unsigned long iflags;
cb59e840 1238 unsigned int ms;
1da177e4 1239
1da177e4
LT		 1240 if (NULL == srp) {
1241 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1da177e4
LT		 1242 return;
1243 }
1244 sfp = srp->parentfp;
1245 if (sfp)
1246 sdp = sfp->parentdp;
1247 if ((NULL == sdp) || sdp->detached) {
1248 printk(KERN_INFO "sg_cmd_done: device detached\n");
1da177e4
LT		 1249 return;
1250 }
1251
1da177e4
LT		 1252
1253 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
d6b10348
MC		 1254 sdp->disk->disk_name, srp->header.pack_id, result));
1255 srp->header.resid = resid;
cb59e840
DG		 1256 ms = jiffies_to_msecs(jiffies);
1257 srp->header.duration = (ms > srp->header.duration) ?
1258 (ms - srp->header.duration) : 0;
d6b10348 1259 if (0 != result) {
1da177e4
LT		 1260 struct scsi_sense_hdr sshdr;
1261
d6b10348
MC		 1262 memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
1263 srp->header.status = 0xff & result;
1264 srp->header.masked_status = status_byte(result);
1265 srp->header.msg_status = msg_byte(result);
1266 srp->header.host_status = host_byte(result);
1267 srp->header.driver_status = driver_byte(result);
1da177e4
LT		 1268 if ((sdp->sgdebug > 0) &&
1269 ((CHECK_CONDITION == srp->header.masked_status) ||
1270 (COMMAND_TERMINATED == srp->header.masked_status)))
d6b10348
MC		 1271 __scsi_print_sense("sg_cmd_done", sense,
1272 SCSI_SENSE_BUFFERSIZE);
1da177e4
LT		 1273
1274 /* Following if statement is a patch supplied by Eric Youngdale */
d6b10348
MC		 1275 if (driver_byte(result) != 0
1276 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1da177e4
LT		 1277 && !scsi_sense_is_deferred(&sshdr)
1278 && sshdr.sense_key == UNIT_ATTENTION
1279 && sdp->device->removable) {
1280 /* Detected possible disc change. Set the bit - this */
1281 /* may be used if there are filesystems using this device */
1282 sdp->device->changed = 1;
1283 }
1284 }
1285 /* Rely on write phase to clean out srp status values, so no "else" */
1286
1da177e4
LT		 1287 if (sfp->closed) { /* whoops this fd already released, cleanup */
1288 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1289 sg_finish_rem_req(srp);
1290 srp = NULL;
1291 if (NULL == sfp->headrp) {
7ca63cb4 1292 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1da177e4
LT		 1293 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1294 scsi_device_put(sdp->device);
1295 }
1296 sfp = NULL;
1297 }
1298 } else if (srp && srp->orphan) {
1299 if (sfp->keep_orphan)
1300 srp->sg_io_owned = 0;
1301 else {
1302 sg_finish_rem_req(srp);
1303 srp = NULL;
1304 }
1305 }
1306 if (sfp && srp) {
1307 /* Now wake up any sg_read() that is waiting for this packet. */
1308 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1309 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1310 srp->done = 1;
1311 wake_up_interruptible(&sfp->read_wait);
1312 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1313 }
1314}
1315
1316static struct file_operations sg_fops = {
1317 .owner = THIS_MODULE,
1318 .read = sg_read,
1319 .write = sg_write,
1320 .poll = sg_poll,
1321 .ioctl = sg_ioctl,
1322#ifdef CONFIG_COMPAT
1323 .compat_ioctl = sg_compat_ioctl,
1324#endif
1325 .open = sg_open,
1326 .mmap = sg_mmap,
1327 .release = sg_release,
1328 .fasync = sg_fasync,
1329};
1330
d253878b 1331static struct class *sg_sysfs_class;
1da177e4
LT		 1332
1333static int sg_sysfs_valid = 0;
1334
7c07d613 1335static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1da177e4 1336{
d6b10348 1337 struct request_queue *q = scsidp->request_queue;
1da177e4
LT		 1338 Sg_device *sdp;
1339 unsigned long iflags;
7c07d613
JB		 1340 int error;
1341 u32 k;
1da177e4 1342
24669f75 1343 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1da177e4
LT		 1344 if (!sdp) {
1345 printk(KERN_WARNING "kmalloc Sg_device failure\n");
7c07d613
JB		 1346 return ERR_PTR(-ENOMEM);
1347 }
1348 error = -ENOMEM;
1349 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1350 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1351 goto out;
1da177e4
LT		 1352 }
1353
7c07d613
JB		 1354 write_lock_irqsave(&sg_index_lock, iflags);
1355 error = idr_get_new(&sg_index_idr, sdp, &k);
1356 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 1357
7c07d613
JB		 1358 if (error) {
1359 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1360 error);
1361 goto out;
1da177e4
LT		 1362 }
1363
1da177e4
LT		 1364 if (unlikely(k >= SG_MAX_DEVS))
1365 goto overflow;
1366
1da177e4
LT		 1367 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1368 sprintf(disk->disk_name, "sg%d", k);
1369 disk->first_minor = k;
1370 sdp->disk = disk;
1371 sdp->device = scsidp;
1372 init_waitqueue_head(&sdp->o_excl_wait);
d6b10348 1373 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
7c07d613 1374 sdp->index = k;
1da177e4 1375
7c07d613 1376 error = 0;
1da177e4 1377 out:
7c07d613 1378 if (error) {
1da177e4 1379 kfree(sdp);
7c07d613
JB		 1380 return ERR_PTR(error);
1381 }
1382 return sdp;
1da177e4
LT		 1383
1384 overflow:
9ccfc756
JB		 1385 sdev_printk(KERN_WARNING, scsidp,
1386 "Unable to attach sg device type=%d, minor "
1387 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1da177e4
LT		 1388 error = -ENODEV;
1389 goto out;
1390}
1391
1392static int
d8539d81 1393sg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
1da177e4
LT		 1394{
1395 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1396 struct gendisk *disk;
1397 Sg_device *sdp = NULL;
1398 struct cdev * cdev = NULL;
7c07d613 1399 int error;
454e8957 1400 unsigned long iflags;
1da177e4
LT		 1401
1402 disk = alloc_disk(1);
1403 if (!disk) {
1404 printk(KERN_WARNING "alloc_disk failed\n");
1405 return -ENOMEM;
1406 }
1407 disk->major = SCSI_GENERIC_MAJOR;
1408
1409 error = -ENOMEM;
1410 cdev = cdev_alloc();
1411 if (!cdev) {
1412 printk(KERN_WARNING "cdev_alloc failed\n");
1413 goto out;
1414 }
1415 cdev->owner = THIS_MODULE;
1416 cdev->ops = &sg_fops;
1417
7c07d613
JB		 1418 sdp = sg_alloc(disk, scsidp);
1419 if (IS_ERR(sdp)) {
1da177e4 1420 printk(KERN_WARNING "sg_alloc failed\n");
7c07d613 1421 error = PTR_ERR(sdp);
1da177e4
LT		 1422 goto out;
1423 }
1da177e4 1424
7c07d613 1425 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
5e3c34c1 1426 if (error)
454e8957 1427 goto cdev_add_err;
5e3c34c1 1428
1da177e4
LT		 1429 sdp->cdev = cdev;
1430 if (sg_sysfs_valid) {
1431 struct class_device * sg_class_member;
1432
53f46542 1433 sg_class_member = class_device_create(sg_sysfs_class, NULL,
7c07d613
JB		 1434 MKDEV(SCSI_GENERIC_MAJOR, sdp->index),
1435 cl_dev->dev, "%s",
1da177e4
LT		 1436 disk->disk_name);
1437 if (IS_ERR(sg_class_member))
1438 printk(KERN_WARNING "sg_add: "
d253878b 1439 "class_device_create failed\n");
1da177e4
LT		 1440 class_set_devdata(sg_class_member, sdp);
1441 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1442 &sg_class_member->kobj, "generic");
1443 if (error)
1444 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1445 "'generic' back to sg%d\n", sdp->index);
1da177e4 1446 } else
7c07d613 1447 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1448
9ccfc756 1449 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1450 "Attached scsi generic sg%d type %d\n", sdp->index,
1451 scsidp->type);
1da177e4 1452
a24484f2
FT		 1453 class_set_devdata(cl_dev, sdp);
1454
1da177e4
LT		 1455 return 0;
1456
454e8957 1457cdev_add_err:
7c07d613
JB		 1458 write_lock_irqsave(&sg_index_lock, iflags);
1459 idr_remove(&sg_index_idr, sdp->index);
1460 write_unlock_irqrestore(&sg_index_lock, iflags);
1461 kfree(sdp);
454e8957 1462
1da177e4
LT		 1463out:
1464 put_disk(disk);
1465 if (cdev)
1466 cdev_del(cdev);
1467 return error;
1468}
1469
1470static void
d8539d81 1471sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1da177e4
LT		 1472{
1473 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
7c07d613 1474 Sg_device *sdp = class_get_devdata(cl_dev);
1da177e4
LT		 1475 unsigned long iflags;
1476 Sg_fd *sfp;
1477 Sg_fd *tsfp;
1478 Sg_request *srp;
1479 Sg_request *tsrp;
7c07d613 1480 int delay;
1da177e4 1481
7c07d613 1482 if (!sdp)
1da177e4 1483 return;
7c07d613 1484
1da177e4 1485 delay = 0;
7c07d613
JB		 1486 write_lock_irqsave(&sg_index_lock, iflags);
1487 if (sdp->headfp) {
1488 sdp->detached = 1;
1489 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1490 tsfp = sfp->nextfp;
1491 for (srp = sfp->headrp; srp; srp = tsrp) {
1492 tsrp = srp->nextrp;
1493 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1494 sg_finish_rem_req(srp);
1da177e4 1495 }
7c07d613
JB		 1496 if (sfp->closed) {
1497 scsi_device_put(sdp->device);
1498 __sg_remove_sfp(sdp, sfp);
1499 } else {
1500 delay = 1;
1501 wake_up_interruptible(&sfp->read_wait);
1502 kill_fasync(&sfp->async_qp, SIGPOLL,
1503 POLL_HUP);
1da177e4 1504 }
1da177e4 1505 }
7c07d613
JB		 1506 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1507 if (NULL == sdp->headfp) {
1508 idr_remove(&sg_index_idr, sdp->index);
1509 }
1510 } else { /* nothing active, simple case */
1511 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1512 idr_remove(&sg_index_idr, sdp->index);
1513 }
1514 write_unlock_irqrestore(&sg_index_lock, iflags);
1515
1516 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1517 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1518 cdev_del(sdp->cdev);
1519 sdp->cdev = NULL;
1520 put_disk(sdp->disk);
1521 sdp->disk = NULL;
1522 if (NULL == sdp->headfp)
1523 kfree(sdp);
1da177e4
LT		 1524
1525 if (delay)
1526 msleep(10); /* dirty detach so delay device destruction */
1527}
1528
6460e75a
DG		 1529module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1530module_param_named(def_reserved_size, def_reserved_size, int,
1531 S_IRUGO | S_IWUSR);
1da177e4
LT		 1532module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1533
1534MODULE_AUTHOR("Douglas Gilbert");
1535MODULE_DESCRIPTION("SCSI generic (sg) driver");
1536MODULE_LICENSE("GPL");
1537MODULE_VERSION(SG_VERSION_STR);
f018fa55 1538MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1539
6460e75a
DG		 1540MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1541 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1542MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1543MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1544
1545static int __init
1546init_sg(void)
1547{
1548 int rc;
1549
6460e75a
DG		 1550 if (scatter_elem_sz < PAGE_SIZE) {
1551 scatter_elem_sz = PAGE_SIZE;
1552 scatter_elem_sz_prev = scatter_elem_sz;
1553 }
1da177e4
LT		 1554 if (def_reserved_size >= 0)
1555 sg_big_buff = def_reserved_size;
6460e75a
DG		 1556 else
1557 def_reserved_size = sg_big_buff;
1da177e4
LT		 1558
1559 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1560 SG_MAX_DEVS, "sg");
1561 if (rc)
1562 return rc;
d253878b 1563 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1564 if ( IS_ERR(sg_sysfs_class) ) {
1565 rc = PTR_ERR(sg_sysfs_class);
1566 goto err_out;
1567 }
1568 sg_sysfs_valid = 1;
1569 rc = scsi_register_interface(&sg_interface);
1570 if (0 == rc) {
1571#ifdef CONFIG_SCSI_PROC_FS
1572 sg_proc_init();
1573#endif /* CONFIG_SCSI_PROC_FS */
1574 return 0;
1575 }
d253878b 1576 class_destroy(sg_sysfs_class);
1da177e4
LT		 1577err_out:
1578 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1579 return rc;
1580}
1581
1582static void __exit
1583exit_sg(void)
1584{
1585#ifdef CONFIG_SCSI_PROC_FS
1586 sg_proc_cleanup();
1587#endif /* CONFIG_SCSI_PROC_FS */
1588 scsi_unregister_interface(&sg_interface);
d253878b 1589 class_destroy(sg_sysfs_class);
1da177e4
LT		 1590 sg_sysfs_valid = 0;
1591 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1592 SG_MAX_DEVS);
7c07d613 1593 idr_destroy(&sg_index_idr);
1da177e4
LT		 1594}
1595
1596static int
1597sg_start_req(Sg_request * srp)
1598{
1599 int res;
1600 Sg_fd *sfp = srp->parentfp;
1601 sg_io_hdr_t *hp = &srp->header;
1602 int dxfer_len = (int) hp->dxfer_len;
1603 int dxfer_dir = hp->dxfer_direction;
1604 Sg_scatter_hold *req_schp = &srp->data;
1605 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1606
1607 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1608 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1609 return 0;
1610 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1611 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1612 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1613 res = sg_build_direct(srp, sfp, dxfer_len);
1614 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1615 return res;
1616 }
1617 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1618 sg_link_reserve(sfp, srp, dxfer_len);
1619 else {
1620 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1621 if (res) {
1622 sg_remove_scat(req_schp);
1623 return res;
1624 }
1625 }
1626 return 0;
1627}
1628
1629static void
1630sg_finish_rem_req(Sg_request * srp)
1631{
1632 Sg_fd *sfp = srp->parentfp;
1633 Sg_scatter_hold *req_schp = &srp->data;
1634
1635 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1636 if (srp->res_used)
1637 sg_unlink_reserve(sfp, srp);
1638 else
1639 sg_remove_scat(req_schp);
1640 sg_remove_request(sfp, srp);
1641}
1642
1643static int
1644sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1645{
d6b10348 1646 int sg_bufflen = tablesize * sizeof(struct scatterlist);
2d20eaf9 1647 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1648
d6b10348
MC		 1649 /*
1650 * TODO: test without low_dma, we should not need it since
1651 * the block layer will bounce the buffer for us
1652 *
1653 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1654 */
1655 if (sfp->low_dma)
1656 gfp_flags |= GFP_DMA;
1657 schp->buffer = kzalloc(sg_bufflen, gfp_flags);
1da177e4
LT		 1658 if (!schp->buffer)
1659 return -ENOMEM;
30fa0d0f 1660 sg_init_table(schp->buffer, tablesize);
1da177e4 1661 schp->sglist_len = sg_bufflen;
d6b10348 1662 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1663}
1664
1665#ifdef SG_ALLOW_DIO_CODE
1666/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
d6b10348 1667 /* TODO: hopefully we can use the generic block layer code */
1da177e4
LT		 1668
1669/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1670 - mapping of all pages not successful
1da177e4
LT		 1671 (i.e., either completely successful or fails)
1672*/
1673static int
1674st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
d6b10348 1675 unsigned long uaddr, size_t count, int rw)
1da177e4 1676{
deb92b7e
DG		 1677 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1678 unsigned long start = uaddr >> PAGE_SHIFT;
1679 const int nr_pages = end - start;
1da177e4 1680 int res, i, j;
1da177e4
LT		 1681 struct page **pages;
1682
1da177e4
LT		 1683 /* User attempted Overflow! */
1684 if ((uaddr + count) < uaddr)
1685 return -EINVAL;
1686
1687 /* Too big */
1688 if (nr_pages > max_pages)
1689 return -ENOMEM;
1690
1691 /* Hmm? */
1692 if (count == 0)
1693 return 0;
1694
1695 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1696 return -ENOMEM;
1697
1698 /* Try to fault in all of the necessary pages */
1699 down_read(&current->mm->mmap_sem);
1700 /* rw==READ means read from drive, write into memory area */
1701 res = get_user_pages(
1702 current,
1703 current->mm,
1704 uaddr,
1705 nr_pages,
1706 rw == READ,
1707 0, /* don't force */
1708 pages,
1709 NULL);
1710 up_read(&current->mm->mmap_sem);
1711
1712 /* Errors and no page mapped should return here */
1713 if (res < nr_pages)
1714 goto out_unmap;
1715
1716 for (i=0; i < nr_pages; i++) {
1717 /* FIXME: flush superflous for rw==READ,
1718 * probably wrong function for rw==WRITE
1719 */
1720 flush_dcache_page(pages[i]);
1da177e4
LT		 1721 /* ?? Is locking needed? I don't think so */
1722 /* if (TestSetPageLocked(pages[i]))
1723 goto out_unlock; */
1724 }
1725
642f1490 1726 sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK);
1da177e4
LT		 1727 if (nr_pages > 1) {
1728 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1729 count -= sgl[0].length;
642f1490
JA		 1730 for (i=1; i < nr_pages ; i++)
1731 sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0);
1da177e4
LT		 1732 }
1733 else {
1734 sgl[0].length = count;
1735 }
1736
1737 kfree(pages);
1738 return nr_pages;
1739
1da177e4 1740 out_unmap:
4d5cda06 1741 if (res > 0) {
1da177e4
LT		 1742 for (j=0; j < res; j++)
1743 page_cache_release(pages[j]);
4d5cda06
HD		 1744 res = 0;
1745 }
1da177e4
LT		 1746 kfree(pages);
1747 return res;
1748}
1749
1750
1751/* And unmap them... */
1752static int
1753st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1754 int dirtied)
1755{
1756 int i;
1757
1758 for (i=0; i < nr_pages; i++) {
45711f1a 1759 struct page *page = sg_page(&sgl[i]);
b5810039 1760
b5810039
NP		 1761 if (dirtied)
1762 SetPageDirty(page);
1763 /* unlock_page(page); */
1da177e4
LT		 1764 /* FIXME: cache flush missing for rw==READ
1765 * FIXME: call the correct reference counting function
1766 */
b5810039 1767 page_cache_release(page);
1da177e4
LT		 1768 }
1769
1770 return 0;
1771}
1772
1773/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1774#endif
1775
1776
1777/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1778static int
1779sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1780{
1781#ifdef SG_ALLOW_DIO_CODE
1782 sg_io_hdr_t *hp = &srp->header;
1783 Sg_scatter_hold *schp = &srp->data;
1784 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4
LT		 1785 int mx_sc_elems, res;
1786 struct scsi_device *sdev = sfp->parentdp->device;
1787
1788 if (((unsigned long)hp->dxferp &
1789 queue_dma_alignment(sdev->request_queue)) != 0)
1790 return 1;
d6b10348 1791
1da177e4
LT		 1792 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1793 if (mx_sc_elems <= 0) {
1794 return 1;
1795 }
d6b10348
MC		 1796 res = st_map_user_pages(schp->buffer, mx_sc_elems,
1797 (unsigned long)hp->dxferp, dxfer_len,
1798 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
c06bb7f5
DG		 1799 if (res <= 0) {
1800 sg_remove_scat(schp);
1da177e4 1801 return 1;
c06bb7f5 1802 }
1da177e4
LT		 1803 schp->k_use_sg = res;
1804 schp->dio_in_use = 1;
1805 hp->info |= SG_INFO_DIRECT_IO;
1806 return 0;
1807#else
1808 return 1;
1809#endif
1810}
1811
1812static int
1813sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1814{
d6b10348
MC		 1815 struct scatterlist *sg;
1816 int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
1817 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4 1818 int blk_size = buff_size;
d6b10348 1819 struct page *p = NULL;
1da177e4 1820
fb119935 1821 if (blk_size < 0)
1da177e4
LT		 1822 return -EFAULT;
1823 if (0 == blk_size)
1824 ++blk_size; /* don't know why */
1825/* round request up to next highest SG_SECTOR_SZ byte boundary */
1826 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1827 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1828 buff_size, blk_size));
d6b10348
MC		 1829
1830 /* N.B. ret_sz carried into this block ... */
1831 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1832 if (mx_sc_elems < 0)
1833 return mx_sc_elems; /* most likely -ENOMEM */
1834
6460e75a
DG		 1835 num = scatter_elem_sz;
1836 if (unlikely(num != scatter_elem_sz_prev)) {
1837 if (num < PAGE_SIZE) {
1838 scatter_elem_sz = PAGE_SIZE;
1839 scatter_elem_sz_prev = PAGE_SIZE;
1840 } else
1841 scatter_elem_sz_prev = num;
1842 }
d6b10348
MC		 1843 for (k = 0, sg = schp->buffer, rem_sz = blk_size;
1844 (rem_sz > 0) && (k < mx_sc_elems);
b0f655d0 1845 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {
d6b10348 1846
6460e75a
DG		 1847 num = (rem_sz > scatter_elem_sz_prev) ?
1848 scatter_elem_sz_prev : rem_sz;
d6b10348 1849 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1da177e4
LT		 1850 if (!p)
1851 return -ENOMEM;
d6b10348 1852
6460e75a
DG		 1853 if (num == scatter_elem_sz_prev) {
1854 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1855 scatter_elem_sz = ret_sz;
1856 scatter_elem_sz_prev = ret_sz;
1857 }
1858 }
642f1490 1859 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0);
d6b10348 1860
7ca63cb4
DG		 1861 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1862 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1863 } /* end of for loop */
1864
1865 schp->k_use_sg = k;
7ca63cb4
DG		 1866 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1867 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1868
1869 schp->bufflen = blk_size;
1870 if (rem_sz > 0) /* must have failed */
1871 return -ENOMEM;
1872
1da177e4
LT		 1873 return 0;
1874}
1875
1876static int
1877sg_write_xfer(Sg_request * srp)
1878{
1879 sg_io_hdr_t *hp = &srp->header;
1880 Sg_scatter_hold *schp = &srp->data;
d6b10348 1881 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 1882 int num_xfer = 0;
1883 int j, k, onum, usglen, ksglen, res;
1884 int iovec_count = (int) hp->iovec_count;
1885 int dxfer_dir = hp->dxfer_direction;
1886 unsigned char *p;
1887 unsigned char __user *up;
1888 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1889
1890 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1891 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1892 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1893 if (schp->bufflen < num_xfer)
1894 num_xfer = schp->bufflen;
1895 }
1896 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1897 (new_interface
1898 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1899 return 0;
1900
1901 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1902 num_xfer, iovec_count, schp->k_use_sg));
1903 if (iovec_count) {
1904 onum = iovec_count;
1905 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1906 return -EFAULT;
1907 } else
1908 onum = 1;
1909
d6b10348 1910 ksglen = sg->length;
45711f1a 1911 p = page_address(sg_page(sg));
d6b10348
MC		 1912 for (j = 0, k = 0; j < onum; ++j) {
1913 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1914 if (res)
1915 return res;
1916
b0f655d0 1917 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 1918 p = page_address(sg_page(sg))) {
d6b10348
MC		 1919 if (usglen <= 0)
1920 break;
1921 if (ksglen > usglen) {
1922 if (usglen >= num_xfer) {
1923 if (__copy_from_user(p, up, num_xfer))
1da177e4 1924 return -EFAULT;
d6b10348 1925 return 0;
1da177e4 1926 }
d6b10348
MC		 1927 if (__copy_from_user(p, up, usglen))
1928 return -EFAULT;
1929 p += usglen;
1930 ksglen -= usglen;
1931 break;
1932 } else {
1933 if (ksglen >= num_xfer) {
1934 if (__copy_from_user(p, up, num_xfer))
1935 return -EFAULT;
1da177e4 1936 return 0;
d6b10348
MC		 1937 }
1938 if (__copy_from_user(p, up, ksglen))
1939 return -EFAULT;
1940 up += ksglen;
1941 usglen -= ksglen;
1da177e4 1942 }
d6b10348
MC		 1943 ++k;
1944 if (k >= schp->k_use_sg)
1945 return 0;
1da177e4
LT		 1946 }
1947 }
d6b10348 1948
1da177e4
LT		 1949 return 0;
1950}
1951
1952static int
1953sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1954 int wr_xf, int *countp, unsigned char __user **up)
1955{
1956 int num_xfer = (int) hp->dxfer_len;
1957 unsigned char __user *p = hp->dxferp;
1958 int count;
1959
1960 if (0 == sg_num) {
1961 if (wr_xf && ('\0' == hp->interface_id))
1962 count = (int) hp->flags; /* holds "old" input_size */
1963 else
1964 count = num_xfer;
1965 } else {
1966 sg_iovec_t iovec;
1967 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
1968 return -EFAULT;
1969 p = iovec.iov_base;
1970 count = (int) iovec.iov_len;
1971 }
1972 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
1973 return -EFAULT;
1974 if (up)
1975 *up = p;
1976 if (countp)
1977 *countp = count;
1978 return 0;
1979}
1980
1981static void
1982sg_remove_scat(Sg_scatter_hold * schp)
1983{
1984 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1985 if (schp->buffer && (schp->sglist_len > 0)) {
d6b10348 1986 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 1987
1988 if (schp->dio_in_use) {
1989#ifdef SG_ALLOW_DIO_CODE
d6b10348 1990 st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
1da177e4
LT		 1991#endif
1992 } else {
1993 int k;
1994
45711f1a 1995 for (k = 0; (k < schp->k_use_sg) && sg_page(sg);
b0f655d0 1996 ++k, sg = sg_next(sg)) {
1da177e4 1997 SCSI_LOG_TIMEOUT(5, printk(
7ca63cb4 1998 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
45711f1a
JA		 1999 k, sg_page(sg), sg->length));
2000 sg_page_free(sg_page(sg), sg->length);
1da177e4
LT		 2001 }
2002 }
d6b10348
MC		 2003 kfree(schp->buffer);
2004 }
1da177e4
LT		 2005 memset(schp, 0, sizeof (*schp));
2006}
2007
2008static int
2009sg_read_xfer(Sg_request * srp)
2010{
2011 sg_io_hdr_t *hp = &srp->header;
2012 Sg_scatter_hold *schp = &srp->data;
d6b10348 2013 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 2014 int num_xfer = 0;
2015 int j, k, onum, usglen, ksglen, res;
2016 int iovec_count = (int) hp->iovec_count;
2017 int dxfer_dir = hp->dxfer_direction;
2018 unsigned char *p;
2019 unsigned char __user *up;
2020 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2021
2022 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2023 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2024 num_xfer = hp->dxfer_len;
2025 if (schp->bufflen < num_xfer)
2026 num_xfer = schp->bufflen;
2027 }
2028 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2029 (new_interface
2030 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2031 return 0;
2032
2033 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2034 num_xfer, iovec_count, schp->k_use_sg));
2035 if (iovec_count) {
2036 onum = iovec_count;
2037 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2038 return -EFAULT;
2039 } else
2040 onum = 1;
2041
45711f1a 2042 p = page_address(sg_page(sg));
d6b10348
MC		 2043 ksglen = sg->length;
2044 for (j = 0, k = 0; j < onum; ++j) {
2045 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2046 if (res)
2047 return res;
2048
b0f655d0 2049 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 2050 p = page_address(sg_page(sg))) {
d6b10348
MC		 2051 if (usglen <= 0)
2052 break;
2053 if (ksglen > usglen) {
2054 if (usglen >= num_xfer) {
2055 if (__copy_to_user(up, p, num_xfer))
1da177e4 2056 return -EFAULT;
d6b10348 2057 return 0;
1da177e4 2058 }
d6b10348
MC		 2059 if (__copy_to_user(up, p, usglen))
2060 return -EFAULT;
2061 p += usglen;
2062 ksglen -= usglen;
2063 break;
2064 } else {
2065 if (ksglen >= num_xfer) {
2066 if (__copy_to_user(up, p, num_xfer))
2067 return -EFAULT;
1da177e4 2068 return 0;
d6b10348
MC		 2069 }
2070 if (__copy_to_user(up, p, ksglen))
2071 return -EFAULT;
2072 up += ksglen;
2073 usglen -= ksglen;
1da177e4 2074 }
d6b10348
MC		 2075 ++k;
2076 if (k >= schp->k_use_sg)
2077 return 0;
1da177e4
LT		 2078 }
2079 }
d6b10348 2080
1da177e4
LT		 2081 return 0;
2082}
2083
2084static int
2085sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2086{
2087 Sg_scatter_hold *schp = &srp->data;
d6b10348
MC		 2088 struct scatterlist *sg = schp->buffer;
2089 int k, num;
1da177e4
LT		 2090
2091 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2092 num_read_xfer));
2093 if ((!outp) || (num_read_xfer <= 0))
2094 return 0;
d6b10348 2095
45711f1a 2096 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) {
d6b10348
MC		 2097 num = sg->length;
2098 if (num > num_read_xfer) {
45711f1a 2099 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2100 num_read_xfer))
2101 return -EFAULT;
2102 break;
2103 } else {
45711f1a 2104 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2105 num))
2106 return -EFAULT;
2107 num_read_xfer -= num;
2108 if (num_read_xfer <= 0)
1da177e4 2109 break;
d6b10348 2110 outp += num;
1da177e4 2111 }
1da177e4 2112 }
d6b10348 2113
1da177e4
LT		 2114 return 0;
2115}
2116
2117static void
2118sg_build_reserve(Sg_fd * sfp, int req_size)
2119{
2120 Sg_scatter_hold *schp = &sfp->reserve;
2121
2122 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2123 do {
2124 if (req_size < PAGE_SIZE)
2125 req_size = PAGE_SIZE;
2126 if (0 == sg_build_indirect(schp, sfp, req_size))
2127 return;
2128 else
2129 sg_remove_scat(schp);
2130 req_size >>= 1; /* divide by 2 */
2131 } while (req_size > (PAGE_SIZE / 2));
2132}
2133
2134static void
2135sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2136{
2137 Sg_scatter_hold *req_schp = &srp->data;
2138 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348
MC		 2139 struct scatterlist *sg = rsv_schp->buffer;
2140 int k, num, rem;
1da177e4
LT		 2141
2142 srp->res_used = 1;
2143 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 2144 rem = size;
d6b10348 2145
b0f655d0 2146 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
d6b10348
MC		 2147 num = sg->length;
2148 if (rem <= num) {
2149 sfp->save_scat_len = num;
2150 sg->length = rem;
2151 req_schp->k_use_sg = k + 1;
2152 req_schp->sglist_len = rsv_schp->sglist_len;
2153 req_schp->buffer = rsv_schp->buffer;
2154
2155 req_schp->bufflen = size;
2156 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2157 break;
2158 } else
2159 rem -= num;
1da177e4 2160 }
d6b10348
MC		 2161
2162 if (k >= rsv_schp->k_use_sg)
2163 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 2164}
2165
2166static void
2167sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2168{
2169 Sg_scatter_hold *req_schp = &srp->data;
2170 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2171
2172 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2173 (int) req_schp->k_use_sg));
2174 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
d6b10348 2175 struct scatterlist *sg = rsv_schp->buffer;
1da177e4
LT		 2176
2177 if (sfp->save_scat_len > 0)
d6b10348 2178 (sg + (req_schp->k_use_sg - 1))->length =
1da177e4
LT		 2179 (unsigned) sfp->save_scat_len;
2180 else
2181 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2182 }
2183 req_schp->k_use_sg = 0;
2184 req_schp->bufflen = 0;
2185 req_schp->buffer = NULL;
2186 req_schp->sglist_len = 0;
2187 sfp->save_scat_len = 0;
2188 srp->res_used = 0;
2189}
2190
2191static Sg_request *
2192sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2193{
2194 Sg_request *resp;
2195 unsigned long iflags;
2196
2197 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2198 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2199 /* look for requests that are ready + not SG_IO owned */
2200 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2201 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2202 resp->done = 2; /* guard against other readers */
2203 break;
2204 }
2205 }
2206 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2207 return resp;
2208}
2209
2210#ifdef CONFIG_SCSI_PROC_FS
2211static Sg_request *
2212sg_get_nth_request(Sg_fd * sfp, int nth)
2213{
2214 Sg_request *resp;
2215 unsigned long iflags;
2216 int k;
2217
2218 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2219 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2220 ++k, resp = resp->nextrp) ;
2221 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2222 return resp;
2223}
2224#endif
2225
2226/* always adds to end of list */
2227static Sg_request *
2228sg_add_request(Sg_fd * sfp)
2229{
2230 int k;
2231 unsigned long iflags;
2232 Sg_request *resp;
2233 Sg_request *rp = sfp->req_arr;
2234
2235 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2236 resp = sfp->headrp;
2237 if (!resp) {
2238 memset(rp, 0, sizeof (Sg_request));
2239 rp->parentfp = sfp;
2240 resp = rp;
2241 sfp->headrp = resp;
2242 } else {
2243 if (0 == sfp->cmd_q)
2244 resp = NULL; /* command queuing disallowed */
2245 else {
2246 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2247 if (!rp->parentfp)
2248 break;
2249 }
2250 if (k < SG_MAX_QUEUE) {
2251 memset(rp, 0, sizeof (Sg_request));
2252 rp->parentfp = sfp;
2253 while (resp->nextrp)
2254 resp = resp->nextrp;
2255 resp->nextrp = rp;
2256 resp = rp;
2257 } else
2258 resp = NULL;
2259 }
2260 }
2261 if (resp) {
2262 resp->nextrp = NULL;
cb59e840 2263 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2264 }
2265 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2266 return resp;
2267}
2268
2269/* Return of 1 for found; 0 for not found */
2270static int
2271sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2272{
2273 Sg_request *prev_rp;
2274 Sg_request *rp;
2275 unsigned long iflags;
2276 int res = 0;
2277
2278 if ((!sfp) || (!srp) || (!sfp->headrp))
2279 return res;
2280 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2281 prev_rp = sfp->headrp;
2282 if (srp == prev_rp) {
2283 sfp->headrp = prev_rp->nextrp;
2284 prev_rp->parentfp = NULL;
2285 res = 1;
2286 } else {
2287 while ((rp = prev_rp->nextrp)) {
2288 if (srp == rp) {
2289 prev_rp->nextrp = rp->nextrp;
2290 rp->parentfp = NULL;
2291 res = 1;
2292 break;
2293 }
2294 prev_rp = rp;
2295 }
2296 }
2297 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2298 return res;
2299}
2300
2301#ifdef CONFIG_SCSI_PROC_FS
2302static Sg_fd *
2303sg_get_nth_sfp(Sg_device * sdp, int nth)
2304{
2305 Sg_fd *resp;
2306 unsigned long iflags;
2307 int k;
2308
7c07d613 2309 read_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2310 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2311 ++k, resp = resp->nextfp) ;
7c07d613 2312 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2313 return resp;
2314}
2315#endif
2316
2317static Sg_fd *
2318sg_add_sfp(Sg_device * sdp, int dev)
2319{
2320 Sg_fd *sfp;
2321 unsigned long iflags;
44ec9542 2322 int bufflen;
1da177e4 2323
d6b10348 2324 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2325 if (!sfp)
2326 return NULL;
d6b10348 2327
1da177e4
LT		 2328 init_waitqueue_head(&sfp->read_wait);
2329 rwlock_init(&sfp->rq_list_lock);
2330
2331 sfp->timeout = SG_DEFAULT_TIMEOUT;
2332 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2333 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2334 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2335 sdp->device->host->unchecked_isa_dma : 1;
2336 sfp->cmd_q = SG_DEF_COMMAND_Q;
2337 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2338 sfp->parentdp = sdp;
7c07d613 2339 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2340 if (!sdp->headfp)
2341 sdp->headfp = sfp;
2342 else { /* add to tail of existing list */
2343 Sg_fd *pfp = sdp->headfp;
2344 while (pfp->nextfp)
2345 pfp = pfp->nextfp;
2346 pfp->nextfp = sfp;
2347 }
7c07d613 2348 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2349 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2350 if (unlikely(sg_big_buff != def_reserved_size))
2351 sg_big_buff = def_reserved_size;
2352
44ec9542
AS		 2353 bufflen = min_t(int, sg_big_buff,
2354 sdp->device->request_queue->max_sectors * 512);
2355 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2356 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2357 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2358 return sfp;
2359}
2360
2361static void
2362__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2363{
2364 Sg_fd *fp;
2365 Sg_fd *prev_fp;
2366
2367 prev_fp = sdp->headfp;
2368 if (sfp == prev_fp)
2369 sdp->headfp = prev_fp->nextfp;
2370 else {
2371 while ((fp = prev_fp->nextfp)) {
2372 if (sfp == fp) {
2373 prev_fp->nextfp = fp->nextfp;
2374 break;
2375 }
2376 prev_fp = fp;
2377 }
2378 }
2379 if (sfp->reserve.bufflen > 0) {
2380 SCSI_LOG_TIMEOUT(6,
2381 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2382 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2383 sg_remove_scat(&sfp->reserve);
2384 }
2385 sfp->parentdp = NULL;
2386 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2387 kfree(sfp);
1da177e4
LT		 2388}
2389
2390/* Returns 0 in normal case, 1 when detached and sdp object removed */
2391static int
2392sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2393{
2394 Sg_request *srp;
2395 Sg_request *tsrp;
2396 int dirty = 0;
2397 int res = 0;
2398
2399 for (srp = sfp->headrp; srp; srp = tsrp) {
2400 tsrp = srp->nextrp;
2401 if (sg_srp_done(srp, sfp))
2402 sg_finish_rem_req(srp);
2403 else
2404 ++dirty;
2405 }
2406 if (0 == dirty) {
2407 unsigned long iflags;
2408
7c07d613 2409 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2410 __sg_remove_sfp(sdp, sfp);
2411 if (sdp->detached && (NULL == sdp->headfp)) {
7c07d613
JB		 2412 idr_remove(&sg_index_idr, sdp->index);
2413 kfree(sdp);
1da177e4
LT		 2414 res = 1;
2415 }
7c07d613 2416 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2417 } else {
2418 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2419 /* only bump the access_count if we actually succeeded in
2420 * throwing another counter on the host module */
2421 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2422 sfp->closed = 1; /* flag dirty state on this fd */
2423 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2424 dirty));
2425 }
2426 return res;
2427}
2428
2429static int
2430sg_res_in_use(Sg_fd * sfp)
2431{
2432 const Sg_request *srp;
2433 unsigned long iflags;
2434
2435 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2436 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2437 if (srp->res_used)
2438 break;
2439 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2440 return srp ? 1 : 0;
2441}
2442
6460e75a 2443/* The size fetched (value output via retSzp) set when non-NULL return */
d6b10348 2444static struct page *
1da177e4
LT		 2445sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2446{
d6b10348 2447 struct page *resp = NULL;
c53033f6 2448 gfp_t page_mask;
1da177e4 2449 int order, a_size;
6460e75a 2450 int resSz;
1da177e4 2451
6460e75a 2452 if ((rqSz <= 0) || (NULL == retSzp))
1da177e4
LT		 2453 return resp;
2454
2455 if (lowDma)
f9aed0e2 2456 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
1da177e4 2457 else
f9aed0e2 2458 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4
LT		 2459
2460 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2461 order++, a_size <<= 1) ;
6460e75a 2462 resSz = a_size; /* rounded up if necessary */
d6b10348 2463 resp = alloc_pages(page_mask, order);
6460e75a 2464 while ((!resp) && order) {
1da177e4
LT		 2465 --order;
2466 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
d6b10348 2467 resp = alloc_pages(page_mask, order); /* try half */
1da177e4
LT		 2468 resSz = a_size;
2469 }
2470 if (resp) {
2471 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
41ed16fa 2472 memset(page_address(resp), 0, resSz);
6460e75a 2473 *retSzp = resSz;
1da177e4
LT		 2474 }
2475 return resp;
2476}
2477
2478static void
d6b10348 2479sg_page_free(struct page *page, int size)
1da177e4
LT		 2480{
2481 int order, a_size;
2482
d6b10348 2483 if (!page)
1da177e4
LT		 2484 return;
2485 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2486 order++, a_size <<= 1) ;
d6b10348 2487 __free_pages(page, order);
1da177e4
LT		 2488}
2489
2490#ifndef MAINTENANCE_IN_CMD
2491#define MAINTENANCE_IN_CMD 0xa3
2492#endif
2493
2494static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2495 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2496 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2497 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2498};
2499
2500static int
2501sg_allow_access(unsigned char opcode, char dev_type)
2502{
2503 int k;
2504
2505 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2506 return 1;
2507 for (k = 0; k < sizeof (allow_ops); ++k) {
2508 if (opcode == allow_ops[k])
2509 return 1;
2510 }
2511 return 0;
2512}
2513
2514#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2515static int
2516sg_idr_max_id(int id, void *p, void *data)
2517{
2518 int *k = data;
2519
2520 if (*k < id)
2521 *k = id;
2522
2523 return 0;
2524}
2525
1da177e4
LT		 2526static int
2527sg_last_dev(void)
2528{
7c07d613 2529 int k = 0;
1da177e4
LT		 2530 unsigned long iflags;
2531
7c07d613
JB		 2532 read_lock_irqsave(&sg_index_lock, iflags);
2533 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2534 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2535 return k + 1; /* origin 1 */
2536}
2537#endif
2538
2539static Sg_device *
2540sg_get_dev(int dev)
2541{
7c07d613 2542 Sg_device *sdp;
1da177e4
LT		 2543 unsigned long iflags;
2544
7c07d613
JB		 2545 read_lock_irqsave(&sg_index_lock, iflags);
2546 sdp = idr_find(&sg_index_idr, dev);
2547 read_unlock_irqrestore(&sg_index_lock, iflags);
2548
1da177e4
LT		 2549 return sdp;
2550}
2551
2552#ifdef CONFIG_SCSI_PROC_FS
2553
2554static struct proc_dir_entry *sg_proc_sgp = NULL;
2555
2556static char sg_proc_sg_dirname[] = "scsi/sg";
2557
2558static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2559
2560static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2561static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2562 size_t count, loff_t *off);
2563static struct file_operations adio_fops = {
2564 /* .owner, .read and .llseek added in sg_proc_init() */
2565 .open = sg_proc_single_open_adio,
2566 .write = sg_proc_write_adio,
2567 .release = single_release,
2568};
2569
2570static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2571static ssize_t sg_proc_write_dressz(struct file *filp,
2572 const char __user *buffer, size_t count, loff_t *off);
2573static struct file_operations dressz_fops = {
2574 .open = sg_proc_single_open_dressz,
2575 .write = sg_proc_write_dressz,
2576 .release = single_release,
2577};
2578
2579static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2580static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2581static struct file_operations version_fops = {
2582 .open = sg_proc_single_open_version,
2583 .release = single_release,
2584};
2585
2586static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2587static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2588static struct file_operations devhdr_fops = {
2589 .open = sg_proc_single_open_devhdr,
2590 .release = single_release,
2591};
2592
2593static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2594static int sg_proc_open_dev(struct inode *inode, struct file *file);
2595static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2596static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2597static void dev_seq_stop(struct seq_file *s, void *v);
2598static struct file_operations dev_fops = {
2599 .open = sg_proc_open_dev,
2600 .release = seq_release,
2601};
2602static struct seq_operations dev_seq_ops = {
2603 .start = dev_seq_start,
2604 .next = dev_seq_next,
2605 .stop = dev_seq_stop,
2606 .show = sg_proc_seq_show_dev,
2607};
2608
2609static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2610static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2611static struct file_operations devstrs_fops = {
2612 .open = sg_proc_open_devstrs,
2613 .release = seq_release,
2614};
2615static struct seq_operations devstrs_seq_ops = {
2616 .start = dev_seq_start,
2617 .next = dev_seq_next,
2618 .stop = dev_seq_stop,
2619 .show = sg_proc_seq_show_devstrs,
2620};
2621
2622static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2623static int sg_proc_open_debug(struct inode *inode, struct file *file);
2624static struct file_operations debug_fops = {
2625 .open = sg_proc_open_debug,
2626 .release = seq_release,
2627};
2628static struct seq_operations debug_seq_ops = {
2629 .start = dev_seq_start,
2630 .next = dev_seq_next,
2631 .stop = dev_seq_stop,
2632 .show = sg_proc_seq_show_debug,
2633};
2634
2635
2636struct sg_proc_leaf {
2637 const char * name;
2638 struct file_operations * fops;
2639};
2640
2641static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2642 {"allow_dio", &adio_fops},
2643 {"debug", &debug_fops},
2644 {"def_reserved_size", &dressz_fops},
2645 {"device_hdr", &devhdr_fops},
2646 {"devices", &dev_fops},
2647 {"device_strs", &devstrs_fops},
2648 {"version", &version_fops}
2649};
2650
2651static int
2652sg_proc_init(void)
2653{
2654 int k, mask;
6391a113 2655 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2656 struct proc_dir_entry *pdep;
2657 struct sg_proc_leaf * leaf;
2658
66600221 2659 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2660 if (!sg_proc_sgp)
2661 return 1;
2662 for (k = 0; k < num_leaves; ++k) {
2663 leaf = &sg_proc_leaf_arr[k];
2664 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2665 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2666 if (pdep) {
2667 leaf->fops->owner = THIS_MODULE,
2668 leaf->fops->read = seq_read,
2669 leaf->fops->llseek = seq_lseek,
2670 pdep->proc_fops = leaf->fops;
2671 }
2672 }
2673 return 0;
2674}
2675
2676static void
2677sg_proc_cleanup(void)
2678{
2679 int k;
6391a113 2680 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2681
2682 if (!sg_proc_sgp)
2683 return;
2684 for (k = 0; k < num_leaves; ++k)
2685 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2686 remove_proc_entry(sg_proc_sg_dirname, NULL);
2687}
2688
2689
2690static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2691{
2692 seq_printf(s, "%d\n", *((int *)s->private));
2693 return 0;
2694}
2695
2696static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2697{
2698 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2699}
2700
2701static ssize_t
2702sg_proc_write_adio(struct file *filp, const char __user *buffer,
2703 size_t count, loff_t *off)
2704{
2705 int num;
2706 char buff[11];
2707
2708 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2709 return -EACCES;
2710 num = (count < 10) ? count : 10;
2711 if (copy_from_user(buff, buffer, num))
2712 return -EFAULT;
2713 buff[num] = '\0';
2714 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2715 return count;
2716}
2717
2718static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2719{
2720 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2721}
2722
2723static ssize_t
2724sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2725 size_t count, loff_t *off)
2726{
2727 int num;
2728 unsigned long k = ULONG_MAX;
2729 char buff[11];
2730
2731 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2732 return -EACCES;
2733 num = (count < 10) ? count : 10;
2734 if (copy_from_user(buff, buffer, num))
2735 return -EFAULT;
2736 buff[num] = '\0';
2737 k = simple_strtoul(buff, NULL, 10);
2738 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2739 sg_big_buff = k;
2740 return count;
2741 }
2742 return -ERANGE;
2743}
2744
2745static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2746{
2747 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2748 sg_version_date);
2749 return 0;
2750}
2751
2752static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2753{
2754 return single_open(file, sg_proc_seq_show_version, NULL);
2755}
2756
2757static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2758{
2759 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2760 "online\n");
2761 return 0;
2762}
2763
2764static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2765{
2766 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2767}
2768
2769struct sg_proc_deviter {
2770 loff_t index;
2771 size_t max;
2772};
2773
2774static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2775{
2776 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2777
729d70f5 2778 s->private = it;
1da177e4
LT		 2779 if (! it)
2780 return NULL;
729d70f5 2781
1da177e4
LT		 2782 it->index = *pos;
2783 it->max = sg_last_dev();
2784 if (it->index >= it->max)
729d70f5 2785 return NULL;
1da177e4 2786 return it;
1da177e4
LT		 2787}
2788
2789static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2790{
729d70f5 2791 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2792
2793 *pos = ++it->index;
2794 return (it->index < it->max) ? it : NULL;
2795}
2796
2797static void dev_seq_stop(struct seq_file *s, void *v)
2798{
729d70f5 2799 kfree(s->private);
1da177e4
LT		 2800}
2801
2802static int sg_proc_open_dev(struct inode *inode, struct file *file)
2803{
2804 return seq_open(file, &dev_seq_ops);
2805}
2806
2807static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2808{
2809 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2810 Sg_device *sdp;
2811 struct scsi_device *scsidp;
2812
2813 sdp = it ? sg_get_dev(it->index) : NULL;
2814 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2815 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2816 scsidp->host->host_no, scsidp->channel,
2817 scsidp->id, scsidp->lun, (int) scsidp->type,
2818 1,
2819 (int) scsidp->queue_depth,
2820 (int) scsidp->device_busy,
2821 (int) scsi_device_online(scsidp));
2822 else
2823 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2824 return 0;
2825}
2826
2827static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2828{
2829 return seq_open(file, &devstrs_seq_ops);
2830}
2831
2832static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2833{
2834 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2835 Sg_device *sdp;
2836 struct scsi_device *scsidp;
2837
2838 sdp = it ? sg_get_dev(it->index) : NULL;
2839 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2840 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2841 scsidp->vendor, scsidp->model, scsidp->rev);
2842 else
2843 seq_printf(s, "<no active device>\n");
2844 return 0;
2845}
2846
2847static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2848{
2849 int k, m, new_interface, blen, usg;
2850 Sg_request *srp;
2851 Sg_fd *fp;
2852 const sg_io_hdr_t *hp;
2853 const char * cp;
cb59e840 2854 unsigned int ms;
1da177e4
LT		 2855
2856 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2857 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2858 "(res)sgat=%d low_dma=%d\n", k + 1,
2859 jiffies_to_msecs(fp->timeout),
2860 fp->reserve.bufflen,
2861 (int) fp->reserve.k_use_sg,
2862 (int) fp->low_dma);
2863 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2864 (int) fp->cmd_q, (int) fp->force_packid,
2865 (int) fp->keep_orphan, (int) fp->closed);
2866 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2867 hp = &srp->header;
2868 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2869 if (srp->res_used) {
2870 if (new_interface &&
2871 (SG_FLAG_MMAP_IO & hp->flags))
2872 cp = " mmap>> ";
2873 else
2874 cp = " rb>> ";
2875 } else {
2876 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2877 cp = " dio>> ";
2878 else
2879 cp = " ";
2880 }
2881 seq_printf(s, cp);
d6b10348
MC		 2882 blen = srp->data.bufflen;
2883 usg = srp->data.k_use_sg;
1da177e4
LT		 2884 seq_printf(s, srp->done ?
2885 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2886 : "act:");
1da177e4
LT		 2887 seq_printf(s, " id=%d blen=%d",
2888 srp->header.pack_id, blen);
2889 if (srp->done)
2890 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2891 else {
2892 ms = jiffies_to_msecs(jiffies);
1da177e4 2893 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2894 (new_interface ? hp->timeout :
2895 jiffies_to_msecs(fp->timeout)),
2896 (ms > hp->duration ? ms - hp->duration : 0));
2897 }
1da177e4
LT		 2898 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2899 (int) srp->data.cmd_opcode);
2900 }
2901 if (0 == m)
2902 seq_printf(s, " No requests active\n");
2903 }
2904}
2905
2906static int sg_proc_open_debug(struct inode *inode, struct file *file)
2907{
2908 return seq_open(file, &debug_seq_ops);
2909}
2910
2911static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2912{
2913 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2914 Sg_device *sdp;
2915
2916 if (it && (0 == it->index)) {
7c07d613
JB		 2917 seq_printf(s, "max_active_device=%d(origin 1)\n",
2918 (int)it->max);
1da177e4
LT		 2919 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2920 }
2921 sdp = it ? sg_get_dev(it->index) : NULL;
2922 if (sdp) {
2923 struct scsi_device *scsidp = sdp->device;
2924
2925 if (NULL == scsidp) {
2926 seq_printf(s, "device %d detached ??\n",
2927 (int)it->index);
2928 return 0;
2929 }
2930
2931 if (sg_get_nth_sfp(sdp, 0)) {
2932 seq_printf(s, " >>> device=%s ",
2933 sdp->disk->disk_name);
2934 if (sdp->detached)
2935 seq_printf(s, "detached pending close ");
2936 else
2937 seq_printf
2938 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2939 scsidp->host->host_no,
2940 scsidp->channel, scsidp->id,
2941 scsidp->lun,
2942 scsidp->host->hostt->emulated);
2943 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2944 sdp->sg_tablesize, sdp->exclude);
2945 }
2946 sg_proc_debug_helper(s, sdp);
2947 }
2948 return 0;
2949}
2950
2951#endif /* CONFIG_SCSI_PROC_FS */
2952
2953module_init(init_sg);
2954module_exit(exit_sg);
kernel source for telekom puls (alcatel/mediatek)