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[SCSI] IB/iSER: add logical unit reset support
[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 1436 disk->disk_name);
d07e0361
FT		 1437 if (IS_ERR(sg_class_member)) {
1438 printk(KERN_ERR "sg_add: "
1439 "class_device_create failed\n");
1440 error = PTR_ERR(sg_class_member);
1441 goto cdev_add_err;
1442 }
1da177e4 1443 class_set_devdata(sg_class_member, sdp);
d07e0361 1444 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1da177e4
LT		 1445 &sg_class_member->kobj, "generic");
1446 if (error)
1447 printk(KERN_ERR "sg_add: unable to make symlink "
7c07d613 1448 "'generic' back to sg%d\n", sdp->index);
1da177e4 1449 } else
7c07d613 1450 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1da177e4 1451
9ccfc756 1452 sdev_printk(KERN_NOTICE, scsidp,
7c07d613
JB		 1453 "Attached scsi generic sg%d type %d\n", sdp->index,
1454 scsidp->type);
1da177e4 1455
a24484f2
FT		 1456 class_set_devdata(cl_dev, sdp);
1457
1da177e4
LT		 1458 return 0;
1459
454e8957 1460cdev_add_err:
7c07d613
JB		 1461 write_lock_irqsave(&sg_index_lock, iflags);
1462 idr_remove(&sg_index_idr, sdp->index);
1463 write_unlock_irqrestore(&sg_index_lock, iflags);
1464 kfree(sdp);
454e8957 1465
1da177e4
LT		 1466out:
1467 put_disk(disk);
1468 if (cdev)
1469 cdev_del(cdev);
1470 return error;
1471}
1472
1473static void
d8539d81 1474sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1da177e4
LT		 1475{
1476 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
7c07d613 1477 Sg_device *sdp = class_get_devdata(cl_dev);
1da177e4
LT		 1478 unsigned long iflags;
1479 Sg_fd *sfp;
1480 Sg_fd *tsfp;
1481 Sg_request *srp;
1482 Sg_request *tsrp;
7c07d613 1483 int delay;
1da177e4 1484
7c07d613 1485 if (!sdp)
1da177e4 1486 return;
7c07d613 1487
1da177e4 1488 delay = 0;
7c07d613
JB		 1489 write_lock_irqsave(&sg_index_lock, iflags);
1490 if (sdp->headfp) {
1491 sdp->detached = 1;
1492 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1493 tsfp = sfp->nextfp;
1494 for (srp = sfp->headrp; srp; srp = tsrp) {
1495 tsrp = srp->nextrp;
1496 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1497 sg_finish_rem_req(srp);
1da177e4 1498 }
7c07d613
JB		 1499 if (sfp->closed) {
1500 scsi_device_put(sdp->device);
1501 __sg_remove_sfp(sdp, sfp);
1502 } else {
1503 delay = 1;
1504 wake_up_interruptible(&sfp->read_wait);
1505 kill_fasync(&sfp->async_qp, SIGPOLL,
1506 POLL_HUP);
1da177e4 1507 }
1da177e4 1508 }
7c07d613
JB		 1509 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1510 if (NULL == sdp->headfp) {
1511 idr_remove(&sg_index_idr, sdp->index);
1512 }
1513 } else { /* nothing active, simple case */
1514 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1515 idr_remove(&sg_index_idr, sdp->index);
1516 }
1517 write_unlock_irqrestore(&sg_index_lock, iflags);
1518
1519 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1520 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1521 cdev_del(sdp->cdev);
1522 sdp->cdev = NULL;
1523 put_disk(sdp->disk);
1524 sdp->disk = NULL;
1525 if (NULL == sdp->headfp)
1526 kfree(sdp);
1da177e4
LT		 1527
1528 if (delay)
1529 msleep(10); /* dirty detach so delay device destruction */
1530}
1531
6460e75a
DG		 1532module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1533module_param_named(def_reserved_size, def_reserved_size, int,
1534 S_IRUGO | S_IWUSR);
1da177e4
LT		 1535module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1536
1537MODULE_AUTHOR("Douglas Gilbert");
1538MODULE_DESCRIPTION("SCSI generic (sg) driver");
1539MODULE_LICENSE("GPL");
1540MODULE_VERSION(SG_VERSION_STR);
f018fa55 1541MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1da177e4 1542
6460e75a
DG		 1543MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1544 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1da177e4
LT		 1545MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1546MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1547
1548static int __init
1549init_sg(void)
1550{
1551 int rc;
1552
6460e75a
DG		 1553 if (scatter_elem_sz < PAGE_SIZE) {
1554 scatter_elem_sz = PAGE_SIZE;
1555 scatter_elem_sz_prev = scatter_elem_sz;
1556 }
1da177e4
LT		 1557 if (def_reserved_size >= 0)
1558 sg_big_buff = def_reserved_size;
6460e75a
DG		 1559 else
1560 def_reserved_size = sg_big_buff;
1da177e4
LT		 1561
1562 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1563 SG_MAX_DEVS, "sg");
1564 if (rc)
1565 return rc;
d253878b 1566 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1da177e4
LT		 1567 if ( IS_ERR(sg_sysfs_class) ) {
1568 rc = PTR_ERR(sg_sysfs_class);
1569 goto err_out;
1570 }
1571 sg_sysfs_valid = 1;
1572 rc = scsi_register_interface(&sg_interface);
1573 if (0 == rc) {
1574#ifdef CONFIG_SCSI_PROC_FS
1575 sg_proc_init();
1576#endif /* CONFIG_SCSI_PROC_FS */
1577 return 0;
1578 }
d253878b 1579 class_destroy(sg_sysfs_class);
1da177e4
LT		 1580err_out:
1581 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1582 return rc;
1583}
1584
1585static void __exit
1586exit_sg(void)
1587{
1588#ifdef CONFIG_SCSI_PROC_FS
1589 sg_proc_cleanup();
1590#endif /* CONFIG_SCSI_PROC_FS */
1591 scsi_unregister_interface(&sg_interface);
d253878b 1592 class_destroy(sg_sysfs_class);
1da177e4
LT		 1593 sg_sysfs_valid = 0;
1594 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1595 SG_MAX_DEVS);
7c07d613 1596 idr_destroy(&sg_index_idr);
1da177e4
LT		 1597}
1598
1599static int
1600sg_start_req(Sg_request * srp)
1601{
1602 int res;
1603 Sg_fd *sfp = srp->parentfp;
1604 sg_io_hdr_t *hp = &srp->header;
1605 int dxfer_len = (int) hp->dxfer_len;
1606 int dxfer_dir = hp->dxfer_direction;
1607 Sg_scatter_hold *req_schp = &srp->data;
1608 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1609
1610 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1611 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1612 return 0;
1613 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1614 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1615 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1616 res = sg_build_direct(srp, sfp, dxfer_len);
1617 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1618 return res;
1619 }
1620 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1621 sg_link_reserve(sfp, srp, dxfer_len);
1622 else {
1623 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1624 if (res) {
1625 sg_remove_scat(req_schp);
1626 return res;
1627 }
1628 }
1629 return 0;
1630}
1631
1632static void
1633sg_finish_rem_req(Sg_request * srp)
1634{
1635 Sg_fd *sfp = srp->parentfp;
1636 Sg_scatter_hold *req_schp = &srp->data;
1637
1638 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1639 if (srp->res_used)
1640 sg_unlink_reserve(sfp, srp);
1641 else
1642 sg_remove_scat(req_schp);
1643 sg_remove_request(sfp, srp);
1644}
1645
1646static int
1647sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1648{
d6b10348 1649 int sg_bufflen = tablesize * sizeof(struct scatterlist);
2d20eaf9 1650 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1da177e4 1651
d6b10348
MC		 1652 /*
1653 * TODO: test without low_dma, we should not need it since
1654 * the block layer will bounce the buffer for us
1655 *
1656 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1657 */
1658 if (sfp->low_dma)
1659 gfp_flags |= GFP_DMA;
1660 schp->buffer = kzalloc(sg_bufflen, gfp_flags);
1da177e4
LT		 1661 if (!schp->buffer)
1662 return -ENOMEM;
30fa0d0f 1663 sg_init_table(schp->buffer, tablesize);
1da177e4 1664 schp->sglist_len = sg_bufflen;
d6b10348 1665 return tablesize; /* number of scat_gath elements allocated */
1da177e4
LT		 1666}
1667
1668#ifdef SG_ALLOW_DIO_CODE
1669/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
d6b10348 1670 /* TODO: hopefully we can use the generic block layer code */
1da177e4
LT		 1671
1672/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1673 - mapping of all pages not successful
1da177e4
LT		 1674 (i.e., either completely successful or fails)
1675*/
1676static int
1677st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
d6b10348 1678 unsigned long uaddr, size_t count, int rw)
1da177e4 1679{
deb92b7e
DG		 1680 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1681 unsigned long start = uaddr >> PAGE_SHIFT;
1682 const int nr_pages = end - start;
1da177e4 1683 int res, i, j;
1da177e4
LT		 1684 struct page **pages;
1685
1da177e4
LT		 1686 /* User attempted Overflow! */
1687 if ((uaddr + count) < uaddr)
1688 return -EINVAL;
1689
1690 /* Too big */
1691 if (nr_pages > max_pages)
1692 return -ENOMEM;
1693
1694 /* Hmm? */
1695 if (count == 0)
1696 return 0;
1697
1698 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1699 return -ENOMEM;
1700
1701 /* Try to fault in all of the necessary pages */
1702 down_read(&current->mm->mmap_sem);
1703 /* rw==READ means read from drive, write into memory area */
1704 res = get_user_pages(
1705 current,
1706 current->mm,
1707 uaddr,
1708 nr_pages,
1709 rw == READ,
1710 0, /* don't force */
1711 pages,
1712 NULL);
1713 up_read(&current->mm->mmap_sem);
1714
1715 /* Errors and no page mapped should return here */
1716 if (res < nr_pages)
1717 goto out_unmap;
1718
1719 for (i=0; i < nr_pages; i++) {
1720 /* FIXME: flush superflous for rw==READ,
1721 * probably wrong function for rw==WRITE
1722 */
1723 flush_dcache_page(pages[i]);
1da177e4
LT		 1724 /* ?? Is locking needed? I don't think so */
1725 /* if (TestSetPageLocked(pages[i]))
1726 goto out_unlock; */
1727 }
1728
642f1490 1729 sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK);
1da177e4
LT		 1730 if (nr_pages > 1) {
1731 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1732 count -= sgl[0].length;
642f1490
JA		 1733 for (i=1; i < nr_pages ; i++)
1734 sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0);
1da177e4
LT		 1735 }
1736 else {
1737 sgl[0].length = count;
1738 }
1739
1740 kfree(pages);
1741 return nr_pages;
1742
1da177e4 1743 out_unmap:
4d5cda06 1744 if (res > 0) {
1da177e4
LT		 1745 for (j=0; j < res; j++)
1746 page_cache_release(pages[j]);
4d5cda06
HD		 1747 res = 0;
1748 }
1da177e4
LT		 1749 kfree(pages);
1750 return res;
1751}
1752
1753
1754/* And unmap them... */
1755static int
1756st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1757 int dirtied)
1758{
1759 int i;
1760
1761 for (i=0; i < nr_pages; i++) {
45711f1a 1762 struct page *page = sg_page(&sgl[i]);
b5810039 1763
b5810039
NP		 1764 if (dirtied)
1765 SetPageDirty(page);
1766 /* unlock_page(page); */
1da177e4
LT		 1767 /* FIXME: cache flush missing for rw==READ
1768 * FIXME: call the correct reference counting function
1769 */
b5810039 1770 page_cache_release(page);
1da177e4
LT		 1771 }
1772
1773 return 0;
1774}
1775
1776/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1777#endif
1778
1779
1780/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1781static int
1782sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1783{
1784#ifdef SG_ALLOW_DIO_CODE
1785 sg_io_hdr_t *hp = &srp->header;
1786 Sg_scatter_hold *schp = &srp->data;
1787 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4
LT		 1788 int mx_sc_elems, res;
1789 struct scsi_device *sdev = sfp->parentdp->device;
1790
1791 if (((unsigned long)hp->dxferp &
1792 queue_dma_alignment(sdev->request_queue)) != 0)
1793 return 1;
d6b10348 1794
1da177e4
LT		 1795 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1796 if (mx_sc_elems <= 0) {
1797 return 1;
1798 }
d6b10348
MC		 1799 res = st_map_user_pages(schp->buffer, mx_sc_elems,
1800 (unsigned long)hp->dxferp, dxfer_len,
1801 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
c06bb7f5
DG		 1802 if (res <= 0) {
1803 sg_remove_scat(schp);
1da177e4 1804 return 1;
c06bb7f5 1805 }
1da177e4
LT		 1806 schp->k_use_sg = res;
1807 schp->dio_in_use = 1;
1808 hp->info |= SG_INFO_DIRECT_IO;
1809 return 0;
1810#else
1811 return 1;
1812#endif
1813}
1814
1815static int
1816sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1817{
d6b10348
MC		 1818 struct scatterlist *sg;
1819 int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
1820 int sg_tablesize = sfp->parentdp->sg_tablesize;
1da177e4 1821 int blk_size = buff_size;
d6b10348 1822 struct page *p = NULL;
1da177e4 1823
fb119935 1824 if (blk_size < 0)
1da177e4
LT		 1825 return -EFAULT;
1826 if (0 == blk_size)
1827 ++blk_size; /* don't know why */
1828/* round request up to next highest SG_SECTOR_SZ byte boundary */
1829 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1830 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1831 buff_size, blk_size));
d6b10348
MC		 1832
1833 /* N.B. ret_sz carried into this block ... */
1834 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1835 if (mx_sc_elems < 0)
1836 return mx_sc_elems; /* most likely -ENOMEM */
1837
6460e75a
DG		 1838 num = scatter_elem_sz;
1839 if (unlikely(num != scatter_elem_sz_prev)) {
1840 if (num < PAGE_SIZE) {
1841 scatter_elem_sz = PAGE_SIZE;
1842 scatter_elem_sz_prev = PAGE_SIZE;
1843 } else
1844 scatter_elem_sz_prev = num;
1845 }
d6b10348
MC		 1846 for (k = 0, sg = schp->buffer, rem_sz = blk_size;
1847 (rem_sz > 0) && (k < mx_sc_elems);
b0f655d0 1848 ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {
d6b10348 1849
6460e75a
DG		 1850 num = (rem_sz > scatter_elem_sz_prev) ?
1851 scatter_elem_sz_prev : rem_sz;
d6b10348 1852 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1da177e4
LT		 1853 if (!p)
1854 return -ENOMEM;
d6b10348 1855
6460e75a
DG		 1856 if (num == scatter_elem_sz_prev) {
1857 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1858 scatter_elem_sz = ret_sz;
1859 scatter_elem_sz_prev = ret_sz;
1860 }
1861 }
642f1490 1862 sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0);
d6b10348 1863
7ca63cb4
DG		 1864 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1865 "ret_sz=%d\n", k, num, ret_sz));
d6b10348
MC		 1866 } /* end of for loop */
1867
1868 schp->k_use_sg = k;
7ca63cb4
DG		 1869 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1870 "rem_sz=%d\n", k, rem_sz));
d6b10348
MC		 1871
1872 schp->bufflen = blk_size;
1873 if (rem_sz > 0) /* must have failed */
1874 return -ENOMEM;
1875
1da177e4
LT		 1876 return 0;
1877}
1878
1879static int
1880sg_write_xfer(Sg_request * srp)
1881{
1882 sg_io_hdr_t *hp = &srp->header;
1883 Sg_scatter_hold *schp = &srp->data;
d6b10348 1884 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 1885 int num_xfer = 0;
1886 int j, k, onum, usglen, ksglen, res;
1887 int iovec_count = (int) hp->iovec_count;
1888 int dxfer_dir = hp->dxfer_direction;
1889 unsigned char *p;
1890 unsigned char __user *up;
1891 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1892
1893 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1894 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1895 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1896 if (schp->bufflen < num_xfer)
1897 num_xfer = schp->bufflen;
1898 }
1899 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1900 (new_interface
1901 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1902 return 0;
1903
1904 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1905 num_xfer, iovec_count, schp->k_use_sg));
1906 if (iovec_count) {
1907 onum = iovec_count;
1908 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1909 return -EFAULT;
1910 } else
1911 onum = 1;
1912
d6b10348 1913 ksglen = sg->length;
45711f1a 1914 p = page_address(sg_page(sg));
d6b10348
MC		 1915 for (j = 0, k = 0; j < onum; ++j) {
1916 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1917 if (res)
1918 return res;
1919
b0f655d0 1920 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 1921 p = page_address(sg_page(sg))) {
d6b10348
MC		 1922 if (usglen <= 0)
1923 break;
1924 if (ksglen > usglen) {
1925 if (usglen >= num_xfer) {
1926 if (__copy_from_user(p, up, num_xfer))
1da177e4 1927 return -EFAULT;
d6b10348 1928 return 0;
1da177e4 1929 }
d6b10348
MC		 1930 if (__copy_from_user(p, up, usglen))
1931 return -EFAULT;
1932 p += usglen;
1933 ksglen -= usglen;
1934 break;
1935 } else {
1936 if (ksglen >= num_xfer) {
1937 if (__copy_from_user(p, up, num_xfer))
1938 return -EFAULT;
1da177e4 1939 return 0;
d6b10348
MC		 1940 }
1941 if (__copy_from_user(p, up, ksglen))
1942 return -EFAULT;
1943 up += ksglen;
1944 usglen -= ksglen;
1da177e4 1945 }
d6b10348
MC		 1946 ++k;
1947 if (k >= schp->k_use_sg)
1948 return 0;
1da177e4
LT		 1949 }
1950 }
d6b10348 1951
1da177e4
LT		 1952 return 0;
1953}
1954
1955static int
1956sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1957 int wr_xf, int *countp, unsigned char __user **up)
1958{
1959 int num_xfer = (int) hp->dxfer_len;
1960 unsigned char __user *p = hp->dxferp;
1961 int count;
1962
1963 if (0 == sg_num) {
1964 if (wr_xf && ('\0' == hp->interface_id))
1965 count = (int) hp->flags; /* holds "old" input_size */
1966 else
1967 count = num_xfer;
1968 } else {
1969 sg_iovec_t iovec;
1970 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
1971 return -EFAULT;
1972 p = iovec.iov_base;
1973 count = (int) iovec.iov_len;
1974 }
1975 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
1976 return -EFAULT;
1977 if (up)
1978 *up = p;
1979 if (countp)
1980 *countp = count;
1981 return 0;
1982}
1983
1984static void
1985sg_remove_scat(Sg_scatter_hold * schp)
1986{
1987 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1988 if (schp->buffer && (schp->sglist_len > 0)) {
d6b10348 1989 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 1990
1991 if (schp->dio_in_use) {
1992#ifdef SG_ALLOW_DIO_CODE
d6b10348 1993 st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
1da177e4
LT		 1994#endif
1995 } else {
1996 int k;
1997
45711f1a 1998 for (k = 0; (k < schp->k_use_sg) && sg_page(sg);
b0f655d0 1999 ++k, sg = sg_next(sg)) {
1da177e4 2000 SCSI_LOG_TIMEOUT(5, printk(
7ca63cb4 2001 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
45711f1a
JA		 2002 k, sg_page(sg), sg->length));
2003 sg_page_free(sg_page(sg), sg->length);
1da177e4
LT		 2004 }
2005 }
d6b10348
MC		 2006 kfree(schp->buffer);
2007 }
1da177e4
LT		 2008 memset(schp, 0, sizeof (*schp));
2009}
2010
2011static int
2012sg_read_xfer(Sg_request * srp)
2013{
2014 sg_io_hdr_t *hp = &srp->header;
2015 Sg_scatter_hold *schp = &srp->data;
d6b10348 2016 struct scatterlist *sg = schp->buffer;
1da177e4
LT		 2017 int num_xfer = 0;
2018 int j, k, onum, usglen, ksglen, res;
2019 int iovec_count = (int) hp->iovec_count;
2020 int dxfer_dir = hp->dxfer_direction;
2021 unsigned char *p;
2022 unsigned char __user *up;
2023 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2024
2025 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2026 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2027 num_xfer = hp->dxfer_len;
2028 if (schp->bufflen < num_xfer)
2029 num_xfer = schp->bufflen;
2030 }
2031 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2032 (new_interface
2033 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2034 return 0;
2035
2036 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2037 num_xfer, iovec_count, schp->k_use_sg));
2038 if (iovec_count) {
2039 onum = iovec_count;
2040 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2041 return -EFAULT;
2042 } else
2043 onum = 1;
2044
45711f1a 2045 p = page_address(sg_page(sg));
d6b10348
MC		 2046 ksglen = sg->length;
2047 for (j = 0, k = 0; j < onum; ++j) {
2048 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2049 if (res)
2050 return res;
2051
b0f655d0 2052 for (; p; sg = sg_next(sg), ksglen = sg->length,
45711f1a 2053 p = page_address(sg_page(sg))) {
d6b10348
MC		 2054 if (usglen <= 0)
2055 break;
2056 if (ksglen > usglen) {
2057 if (usglen >= num_xfer) {
2058 if (__copy_to_user(up, p, num_xfer))
1da177e4 2059 return -EFAULT;
d6b10348 2060 return 0;
1da177e4 2061 }
d6b10348
MC		 2062 if (__copy_to_user(up, p, usglen))
2063 return -EFAULT;
2064 p += usglen;
2065 ksglen -= usglen;
2066 break;
2067 } else {
2068 if (ksglen >= num_xfer) {
2069 if (__copy_to_user(up, p, num_xfer))
2070 return -EFAULT;
1da177e4 2071 return 0;
d6b10348
MC		 2072 }
2073 if (__copy_to_user(up, p, ksglen))
2074 return -EFAULT;
2075 up += ksglen;
2076 usglen -= ksglen;
1da177e4 2077 }
d6b10348
MC		 2078 ++k;
2079 if (k >= schp->k_use_sg)
2080 return 0;
1da177e4
LT		 2081 }
2082 }
d6b10348 2083
1da177e4
LT		 2084 return 0;
2085}
2086
2087static int
2088sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2089{
2090 Sg_scatter_hold *schp = &srp->data;
d6b10348
MC		 2091 struct scatterlist *sg = schp->buffer;
2092 int k, num;
1da177e4
LT		 2093
2094 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2095 num_read_xfer));
2096 if ((!outp) || (num_read_xfer <= 0))
2097 return 0;
d6b10348 2098
45711f1a 2099 for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) {
d6b10348
MC		 2100 num = sg->length;
2101 if (num > num_read_xfer) {
45711f1a 2102 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2103 num_read_xfer))
2104 return -EFAULT;
2105 break;
2106 } else {
45711f1a 2107 if (__copy_to_user(outp, page_address(sg_page(sg)),
d6b10348
MC		 2108 num))
2109 return -EFAULT;
2110 num_read_xfer -= num;
2111 if (num_read_xfer <= 0)
1da177e4 2112 break;
d6b10348 2113 outp += num;
1da177e4 2114 }
1da177e4 2115 }
d6b10348 2116
1da177e4
LT		 2117 return 0;
2118}
2119
2120static void
2121sg_build_reserve(Sg_fd * sfp, int req_size)
2122{
2123 Sg_scatter_hold *schp = &sfp->reserve;
2124
2125 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2126 do {
2127 if (req_size < PAGE_SIZE)
2128 req_size = PAGE_SIZE;
2129 if (0 == sg_build_indirect(schp, sfp, req_size))
2130 return;
2131 else
2132 sg_remove_scat(schp);
2133 req_size >>= 1; /* divide by 2 */
2134 } while (req_size > (PAGE_SIZE / 2));
2135}
2136
2137static void
2138sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2139{
2140 Sg_scatter_hold *req_schp = &srp->data;
2141 Sg_scatter_hold *rsv_schp = &sfp->reserve;
d6b10348
MC		 2142 struct scatterlist *sg = rsv_schp->buffer;
2143 int k, num, rem;
1da177e4
LT		 2144
2145 srp->res_used = 1;
2146 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
eca7be5e 2147 rem = size;
d6b10348 2148
b0f655d0 2149 for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
d6b10348
MC		 2150 num = sg->length;
2151 if (rem <= num) {
2152 sfp->save_scat_len = num;
2153 sg->length = rem;
2154 req_schp->k_use_sg = k + 1;
2155 req_schp->sglist_len = rsv_schp->sglist_len;
2156 req_schp->buffer = rsv_schp->buffer;
2157
2158 req_schp->bufflen = size;
2159 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2160 break;
2161 } else
2162 rem -= num;
1da177e4 2163 }
d6b10348
MC		 2164
2165 if (k >= rsv_schp->k_use_sg)
2166 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
1da177e4
LT		 2167}
2168
2169static void
2170sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2171{
2172 Sg_scatter_hold *req_schp = &srp->data;
2173 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2174
2175 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2176 (int) req_schp->k_use_sg));
2177 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
d6b10348 2178 struct scatterlist *sg = rsv_schp->buffer;
1da177e4
LT		 2179
2180 if (sfp->save_scat_len > 0)
d6b10348 2181 (sg + (req_schp->k_use_sg - 1))->length =
1da177e4
LT		 2182 (unsigned) sfp->save_scat_len;
2183 else
2184 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2185 }
2186 req_schp->k_use_sg = 0;
2187 req_schp->bufflen = 0;
2188 req_schp->buffer = NULL;
2189 req_schp->sglist_len = 0;
2190 sfp->save_scat_len = 0;
2191 srp->res_used = 0;
2192}
2193
2194static Sg_request *
2195sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2196{
2197 Sg_request *resp;
2198 unsigned long iflags;
2199
2200 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2201 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2202 /* look for requests that are ready + not SG_IO owned */
2203 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2204 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2205 resp->done = 2; /* guard against other readers */
2206 break;
2207 }
2208 }
2209 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2210 return resp;
2211}
2212
2213#ifdef CONFIG_SCSI_PROC_FS
2214static Sg_request *
2215sg_get_nth_request(Sg_fd * sfp, int nth)
2216{
2217 Sg_request *resp;
2218 unsigned long iflags;
2219 int k;
2220
2221 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2222 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2223 ++k, resp = resp->nextrp) ;
2224 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2225 return resp;
2226}
2227#endif
2228
2229/* always adds to end of list */
2230static Sg_request *
2231sg_add_request(Sg_fd * sfp)
2232{
2233 int k;
2234 unsigned long iflags;
2235 Sg_request *resp;
2236 Sg_request *rp = sfp->req_arr;
2237
2238 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2239 resp = sfp->headrp;
2240 if (!resp) {
2241 memset(rp, 0, sizeof (Sg_request));
2242 rp->parentfp = sfp;
2243 resp = rp;
2244 sfp->headrp = resp;
2245 } else {
2246 if (0 == sfp->cmd_q)
2247 resp = NULL; /* command queuing disallowed */
2248 else {
2249 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2250 if (!rp->parentfp)
2251 break;
2252 }
2253 if (k < SG_MAX_QUEUE) {
2254 memset(rp, 0, sizeof (Sg_request));
2255 rp->parentfp = sfp;
2256 while (resp->nextrp)
2257 resp = resp->nextrp;
2258 resp->nextrp = rp;
2259 resp = rp;
2260 } else
2261 resp = NULL;
2262 }
2263 }
2264 if (resp) {
2265 resp->nextrp = NULL;
cb59e840 2266 resp->header.duration = jiffies_to_msecs(jiffies);
1da177e4
LT		 2267 }
2268 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2269 return resp;
2270}
2271
2272/* Return of 1 for found; 0 for not found */
2273static int
2274sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2275{
2276 Sg_request *prev_rp;
2277 Sg_request *rp;
2278 unsigned long iflags;
2279 int res = 0;
2280
2281 if ((!sfp) || (!srp) || (!sfp->headrp))
2282 return res;
2283 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2284 prev_rp = sfp->headrp;
2285 if (srp == prev_rp) {
2286 sfp->headrp = prev_rp->nextrp;
2287 prev_rp->parentfp = NULL;
2288 res = 1;
2289 } else {
2290 while ((rp = prev_rp->nextrp)) {
2291 if (srp == rp) {
2292 prev_rp->nextrp = rp->nextrp;
2293 rp->parentfp = NULL;
2294 res = 1;
2295 break;
2296 }
2297 prev_rp = rp;
2298 }
2299 }
2300 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2301 return res;
2302}
2303
2304#ifdef CONFIG_SCSI_PROC_FS
2305static Sg_fd *
2306sg_get_nth_sfp(Sg_device * sdp, int nth)
2307{
2308 Sg_fd *resp;
2309 unsigned long iflags;
2310 int k;
2311
7c07d613 2312 read_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2313 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2314 ++k, resp = resp->nextfp) ;
7c07d613 2315 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2316 return resp;
2317}
2318#endif
2319
2320static Sg_fd *
2321sg_add_sfp(Sg_device * sdp, int dev)
2322{
2323 Sg_fd *sfp;
2324 unsigned long iflags;
44ec9542 2325 int bufflen;
1da177e4 2326
d6b10348 2327 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
1da177e4
LT		 2328 if (!sfp)
2329 return NULL;
d6b10348 2330
1da177e4
LT		 2331 init_waitqueue_head(&sfp->read_wait);
2332 rwlock_init(&sfp->rq_list_lock);
2333
2334 sfp->timeout = SG_DEFAULT_TIMEOUT;
2335 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2336 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2337 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2338 sdp->device->host->unchecked_isa_dma : 1;
2339 sfp->cmd_q = SG_DEF_COMMAND_Q;
2340 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2341 sfp->parentdp = sdp;
7c07d613 2342 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2343 if (!sdp->headfp)
2344 sdp->headfp = sfp;
2345 else { /* add to tail of existing list */
2346 Sg_fd *pfp = sdp->headfp;
2347 while (pfp->nextfp)
2348 pfp = pfp->nextfp;
2349 pfp->nextfp = sfp;
2350 }
7c07d613 2351 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4 2352 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
6460e75a
DG		 2353 if (unlikely(sg_big_buff != def_reserved_size))
2354 sg_big_buff = def_reserved_size;
2355
44ec9542
AS		 2356 bufflen = min_t(int, sg_big_buff,
2357 sdp->device->request_queue->max_sectors * 512);
2358 sg_build_reserve(sfp, bufflen);
1da177e4
LT		 2359 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2360 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2361 return sfp;
2362}
2363
2364static void
2365__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2366{
2367 Sg_fd *fp;
2368 Sg_fd *prev_fp;
2369
2370 prev_fp = sdp->headfp;
2371 if (sfp == prev_fp)
2372 sdp->headfp = prev_fp->nextfp;
2373 else {
2374 while ((fp = prev_fp->nextfp)) {
2375 if (sfp == fp) {
2376 prev_fp->nextfp = fp->nextfp;
2377 break;
2378 }
2379 prev_fp = fp;
2380 }
2381 }
2382 if (sfp->reserve.bufflen > 0) {
2383 SCSI_LOG_TIMEOUT(6,
2384 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2385 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
1da177e4
LT		 2386 sg_remove_scat(&sfp->reserve);
2387 }
2388 sfp->parentdp = NULL;
2389 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
d6b10348 2390 kfree(sfp);
1da177e4
LT		 2391}
2392
2393/* Returns 0 in normal case, 1 when detached and sdp object removed */
2394static int
2395sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2396{
2397 Sg_request *srp;
2398 Sg_request *tsrp;
2399 int dirty = 0;
2400 int res = 0;
2401
2402 for (srp = sfp->headrp; srp; srp = tsrp) {
2403 tsrp = srp->nextrp;
2404 if (sg_srp_done(srp, sfp))
2405 sg_finish_rem_req(srp);
2406 else
2407 ++dirty;
2408 }
2409 if (0 == dirty) {
2410 unsigned long iflags;
2411
7c07d613 2412 write_lock_irqsave(&sg_index_lock, iflags);
1da177e4
LT		 2413 __sg_remove_sfp(sdp, sfp);
2414 if (sdp->detached && (NULL == sdp->headfp)) {
7c07d613
JB		 2415 idr_remove(&sg_index_idr, sdp->index);
2416 kfree(sdp);
1da177e4
LT		 2417 res = 1;
2418 }
7c07d613 2419 write_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2420 } else {
2421 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2422 /* only bump the access_count if we actually succeeded in
2423 * throwing another counter on the host module */
2424 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2425 sfp->closed = 1; /* flag dirty state on this fd */
2426 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2427 dirty));
2428 }
2429 return res;
2430}
2431
2432static int
2433sg_res_in_use(Sg_fd * sfp)
2434{
2435 const Sg_request *srp;
2436 unsigned long iflags;
2437
2438 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2439 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2440 if (srp->res_used)
2441 break;
2442 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2443 return srp ? 1 : 0;
2444}
2445
6460e75a 2446/* The size fetched (value output via retSzp) set when non-NULL return */
d6b10348 2447static struct page *
1da177e4
LT		 2448sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2449{
d6b10348 2450 struct page *resp = NULL;
c53033f6 2451 gfp_t page_mask;
1da177e4 2452 int order, a_size;
6460e75a 2453 int resSz;
1da177e4 2454
6460e75a 2455 if ((rqSz <= 0) || (NULL == retSzp))
1da177e4
LT		 2456 return resp;
2457
2458 if (lowDma)
f9aed0e2 2459 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
1da177e4 2460 else
f9aed0e2 2461 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1da177e4
LT		 2462
2463 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2464 order++, a_size <<= 1) ;
6460e75a 2465 resSz = a_size; /* rounded up if necessary */
d6b10348 2466 resp = alloc_pages(page_mask, order);
6460e75a 2467 while ((!resp) && order) {
1da177e4
LT		 2468 --order;
2469 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
d6b10348 2470 resp = alloc_pages(page_mask, order); /* try half */
1da177e4
LT		 2471 resSz = a_size;
2472 }
2473 if (resp) {
2474 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
41ed16fa 2475 memset(page_address(resp), 0, resSz);
6460e75a 2476 *retSzp = resSz;
1da177e4
LT		 2477 }
2478 return resp;
2479}
2480
2481static void
d6b10348 2482sg_page_free(struct page *page, int size)
1da177e4
LT		 2483{
2484 int order, a_size;
2485
d6b10348 2486 if (!page)
1da177e4
LT		 2487 return;
2488 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2489 order++, a_size <<= 1) ;
d6b10348 2490 __free_pages(page, order);
1da177e4
LT		 2491}
2492
2493#ifndef MAINTENANCE_IN_CMD
2494#define MAINTENANCE_IN_CMD 0xa3
2495#endif
2496
2497static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2498 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2499 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2500 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2501};
2502
2503static int
2504sg_allow_access(unsigned char opcode, char dev_type)
2505{
2506 int k;
2507
2508 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2509 return 1;
2510 for (k = 0; k < sizeof (allow_ops); ++k) {
2511 if (opcode == allow_ops[k])
2512 return 1;
2513 }
2514 return 0;
2515}
2516
2517#ifdef CONFIG_SCSI_PROC_FS
7c07d613
JB		 2518static int
2519sg_idr_max_id(int id, void *p, void *data)
2520{
2521 int *k = data;
2522
2523 if (*k < id)
2524 *k = id;
2525
2526 return 0;
2527}
2528
1da177e4
LT		 2529static int
2530sg_last_dev(void)
2531{
7c07d613 2532 int k = 0;
1da177e4
LT		 2533 unsigned long iflags;
2534
7c07d613
JB		 2535 read_lock_irqsave(&sg_index_lock, iflags);
2536 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2537 read_unlock_irqrestore(&sg_index_lock, iflags);
1da177e4
LT		 2538 return k + 1; /* origin 1 */
2539}
2540#endif
2541
2542static Sg_device *
2543sg_get_dev(int dev)
2544{
7c07d613 2545 Sg_device *sdp;
1da177e4
LT		 2546 unsigned long iflags;
2547
7c07d613
JB		 2548 read_lock_irqsave(&sg_index_lock, iflags);
2549 sdp = idr_find(&sg_index_idr, dev);
2550 read_unlock_irqrestore(&sg_index_lock, iflags);
2551
1da177e4
LT		 2552 return sdp;
2553}
2554
2555#ifdef CONFIG_SCSI_PROC_FS
2556
2557static struct proc_dir_entry *sg_proc_sgp = NULL;
2558
2559static char sg_proc_sg_dirname[] = "scsi/sg";
2560
2561static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2562
2563static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2564static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2565 size_t count, loff_t *off);
2566static struct file_operations adio_fops = {
2567 /* .owner, .read and .llseek added in sg_proc_init() */
2568 .open = sg_proc_single_open_adio,
2569 .write = sg_proc_write_adio,
2570 .release = single_release,
2571};
2572
2573static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2574static ssize_t sg_proc_write_dressz(struct file *filp,
2575 const char __user *buffer, size_t count, loff_t *off);
2576static struct file_operations dressz_fops = {
2577 .open = sg_proc_single_open_dressz,
2578 .write = sg_proc_write_dressz,
2579 .release = single_release,
2580};
2581
2582static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2583static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2584static struct file_operations version_fops = {
2585 .open = sg_proc_single_open_version,
2586 .release = single_release,
2587};
2588
2589static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2590static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2591static struct file_operations devhdr_fops = {
2592 .open = sg_proc_single_open_devhdr,
2593 .release = single_release,
2594};
2595
2596static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2597static int sg_proc_open_dev(struct inode *inode, struct file *file);
2598static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2599static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2600static void dev_seq_stop(struct seq_file *s, void *v);
2601static struct file_operations dev_fops = {
2602 .open = sg_proc_open_dev,
2603 .release = seq_release,
2604};
2605static struct seq_operations dev_seq_ops = {
2606 .start = dev_seq_start,
2607 .next = dev_seq_next,
2608 .stop = dev_seq_stop,
2609 .show = sg_proc_seq_show_dev,
2610};
2611
2612static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2613static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2614static struct file_operations devstrs_fops = {
2615 .open = sg_proc_open_devstrs,
2616 .release = seq_release,
2617};
2618static struct seq_operations devstrs_seq_ops = {
2619 .start = dev_seq_start,
2620 .next = dev_seq_next,
2621 .stop = dev_seq_stop,
2622 .show = sg_proc_seq_show_devstrs,
2623};
2624
2625static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2626static int sg_proc_open_debug(struct inode *inode, struct file *file);
2627static struct file_operations debug_fops = {
2628 .open = sg_proc_open_debug,
2629 .release = seq_release,
2630};
2631static struct seq_operations debug_seq_ops = {
2632 .start = dev_seq_start,
2633 .next = dev_seq_next,
2634 .stop = dev_seq_stop,
2635 .show = sg_proc_seq_show_debug,
2636};
2637
2638
2639struct sg_proc_leaf {
2640 const char * name;
2641 struct file_operations * fops;
2642};
2643
2644static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2645 {"allow_dio", &adio_fops},
2646 {"debug", &debug_fops},
2647 {"def_reserved_size", &dressz_fops},
2648 {"device_hdr", &devhdr_fops},
2649 {"devices", &dev_fops},
2650 {"device_strs", &devstrs_fops},
2651 {"version", &version_fops}
2652};
2653
2654static int
2655sg_proc_init(void)
2656{
2657 int k, mask;
6391a113 2658 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2659 struct proc_dir_entry *pdep;
2660 struct sg_proc_leaf * leaf;
2661
66600221 2662 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
1da177e4
LT		 2663 if (!sg_proc_sgp)
2664 return 1;
2665 for (k = 0; k < num_leaves; ++k) {
2666 leaf = &sg_proc_leaf_arr[k];
2667 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2668 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2669 if (pdep) {
2670 leaf->fops->owner = THIS_MODULE,
2671 leaf->fops->read = seq_read,
2672 leaf->fops->llseek = seq_lseek,
2673 pdep->proc_fops = leaf->fops;
2674 }
2675 }
2676 return 0;
2677}
2678
2679static void
2680sg_proc_cleanup(void)
2681{
2682 int k;
6391a113 2683 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
1da177e4
LT		 2684
2685 if (!sg_proc_sgp)
2686 return;
2687 for (k = 0; k < num_leaves; ++k)
2688 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2689 remove_proc_entry(sg_proc_sg_dirname, NULL);
2690}
2691
2692
2693static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2694{
2695 seq_printf(s, "%d\n", *((int *)s->private));
2696 return 0;
2697}
2698
2699static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2700{
2701 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2702}
2703
2704static ssize_t
2705sg_proc_write_adio(struct file *filp, const char __user *buffer,
2706 size_t count, loff_t *off)
2707{
2708 int num;
2709 char buff[11];
2710
2711 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2712 return -EACCES;
2713 num = (count < 10) ? count : 10;
2714 if (copy_from_user(buff, buffer, num))
2715 return -EFAULT;
2716 buff[num] = '\0';
2717 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2718 return count;
2719}
2720
2721static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2722{
2723 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2724}
2725
2726static ssize_t
2727sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2728 size_t count, loff_t *off)
2729{
2730 int num;
2731 unsigned long k = ULONG_MAX;
2732 char buff[11];
2733
2734 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2735 return -EACCES;
2736 num = (count < 10) ? count : 10;
2737 if (copy_from_user(buff, buffer, num))
2738 return -EFAULT;
2739 buff[num] = '\0';
2740 k = simple_strtoul(buff, NULL, 10);
2741 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2742 sg_big_buff = k;
2743 return count;
2744 }
2745 return -ERANGE;
2746}
2747
2748static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2749{
2750 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2751 sg_version_date);
2752 return 0;
2753}
2754
2755static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2756{
2757 return single_open(file, sg_proc_seq_show_version, NULL);
2758}
2759
2760static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2761{
2762 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2763 "online\n");
2764 return 0;
2765}
2766
2767static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2768{
2769 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2770}
2771
2772struct sg_proc_deviter {
2773 loff_t index;
2774 size_t max;
2775};
2776
2777static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2778{
2779 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2780
729d70f5 2781 s->private = it;
1da177e4
LT		 2782 if (! it)
2783 return NULL;
729d70f5 2784
1da177e4
LT		 2785 it->index = *pos;
2786 it->max = sg_last_dev();
2787 if (it->index >= it->max)
729d70f5 2788 return NULL;
1da177e4 2789 return it;
1da177e4
LT		 2790}
2791
2792static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2793{
729d70f5 2794 struct sg_proc_deviter * it = s->private;
1da177e4
LT		 2795
2796 *pos = ++it->index;
2797 return (it->index < it->max) ? it : NULL;
2798}
2799
2800static void dev_seq_stop(struct seq_file *s, void *v)
2801{
729d70f5 2802 kfree(s->private);
1da177e4
LT		 2803}
2804
2805static int sg_proc_open_dev(struct inode *inode, struct file *file)
2806{
2807 return seq_open(file, &dev_seq_ops);
2808}
2809
2810static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2811{
2812 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2813 Sg_device *sdp;
2814 struct scsi_device *scsidp;
2815
2816 sdp = it ? sg_get_dev(it->index) : NULL;
2817 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2818 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2819 scsidp->host->host_no, scsidp->channel,
2820 scsidp->id, scsidp->lun, (int) scsidp->type,
2821 1,
2822 (int) scsidp->queue_depth,
2823 (int) scsidp->device_busy,
2824 (int) scsi_device_online(scsidp));
2825 else
2826 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2827 return 0;
2828}
2829
2830static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2831{
2832 return seq_open(file, &devstrs_seq_ops);
2833}
2834
2835static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2836{
2837 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2838 Sg_device *sdp;
2839 struct scsi_device *scsidp;
2840
2841 sdp = it ? sg_get_dev(it->index) : NULL;
2842 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2843 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2844 scsidp->vendor, scsidp->model, scsidp->rev);
2845 else
2846 seq_printf(s, "<no active device>\n");
2847 return 0;
2848}
2849
2850static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2851{
2852 int k, m, new_interface, blen, usg;
2853 Sg_request *srp;
2854 Sg_fd *fp;
2855 const sg_io_hdr_t *hp;
2856 const char * cp;
cb59e840 2857 unsigned int ms;
1da177e4
LT		 2858
2859 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2860 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2861 "(res)sgat=%d low_dma=%d\n", k + 1,
2862 jiffies_to_msecs(fp->timeout),
2863 fp->reserve.bufflen,
2864 (int) fp->reserve.k_use_sg,
2865 (int) fp->low_dma);
2866 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2867 (int) fp->cmd_q, (int) fp->force_packid,
2868 (int) fp->keep_orphan, (int) fp->closed);
2869 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2870 hp = &srp->header;
2871 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2872 if (srp->res_used) {
2873 if (new_interface &&
2874 (SG_FLAG_MMAP_IO & hp->flags))
2875 cp = " mmap>> ";
2876 else
2877 cp = " rb>> ";
2878 } else {
2879 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2880 cp = " dio>> ";
2881 else
2882 cp = " ";
2883 }
2884 seq_printf(s, cp);
d6b10348
MC		 2885 blen = srp->data.bufflen;
2886 usg = srp->data.k_use_sg;
1da177e4
LT		 2887 seq_printf(s, srp->done ?
2888 ((1 == srp->done) ? "rcv:" : "fin:")
d6b10348 2889 : "act:");
1da177e4
LT		 2890 seq_printf(s, " id=%d blen=%d",
2891 srp->header.pack_id, blen);
2892 if (srp->done)
2893 seq_printf(s, " dur=%d", hp->duration);
cb59e840
DG		 2894 else {
2895 ms = jiffies_to_msecs(jiffies);
1da177e4 2896 seq_printf(s, " t_o/elap=%d/%d",
cb59e840
DG		 2897 (new_interface ? hp->timeout :
2898 jiffies_to_msecs(fp->timeout)),
2899 (ms > hp->duration ? ms - hp->duration : 0));
2900 }
1da177e4
LT		 2901 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2902 (int) srp->data.cmd_opcode);
2903 }
2904 if (0 == m)
2905 seq_printf(s, " No requests active\n");
2906 }
2907}
2908
2909static int sg_proc_open_debug(struct inode *inode, struct file *file)
2910{
2911 return seq_open(file, &debug_seq_ops);
2912}
2913
2914static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2915{
2916 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2917 Sg_device *sdp;
2918
2919 if (it && (0 == it->index)) {
7c07d613
JB		 2920 seq_printf(s, "max_active_device=%d(origin 1)\n",
2921 (int)it->max);
1da177e4
LT		 2922 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2923 }
2924 sdp = it ? sg_get_dev(it->index) : NULL;
2925 if (sdp) {
2926 struct scsi_device *scsidp = sdp->device;
2927
2928 if (NULL == scsidp) {
2929 seq_printf(s, "device %d detached ??\n",
2930 (int)it->index);
2931 return 0;
2932 }
2933
2934 if (sg_get_nth_sfp(sdp, 0)) {
2935 seq_printf(s, " >>> device=%s ",
2936 sdp->disk->disk_name);
2937 if (sdp->detached)
2938 seq_printf(s, "detached pending close ");
2939 else
2940 seq_printf
2941 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2942 scsidp->host->host_no,
2943 scsidp->channel, scsidp->id,
2944 scsidp->lun,
2945 scsidp->host->hostt->emulated);
2946 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2947 sdp->sg_tablesize, sdp->exclude);
2948 }
2949 sg_proc_debug_helper(s, sdp);
2950 }
2951 return 0;
2952}
2953
2954#endif /* CONFIG_SCSI_PROC_FS */
2955
2956module_init(init_sg);
2957module_exit(exit_sg);
kernel source for telekom puls (alcatel/mediatek)