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[PATCH] KERNELRELEASE depends on CONFIG_LOCALVERSION
[linux-2.6/mini2440.git] / drivers / scsi / sg.c
blobb55c2a8a547cdc852174b27d68d4c486b39b5a98
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
21 static int sg_version_num = 30533; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.33"
23
24 /*
25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
28 * (otherwise the macros compile to empty statements).
29 *
30 */
31 #include <linux/config.h>
32 #include <linux/module.h>
33
34 #include <linux/fs.h>
35 #include <linux/kernel.h>
36 #include <linux/sched.h>
37 #include <linux/string.h>
38 #include <linux/mm.h>
39 #include <linux/errno.h>
40 #include <linux/mtio.h>
41 #include <linux/ioctl.h>
42 #include <linux/fcntl.h>
43 #include <linux/init.h>
44 #include <linux/poll.h>
45 #include <linux/smp_lock.h>
46 #include <linux/moduleparam.h>
47 #include <linux/devfs_fs_kernel.h>
48 #include <linux/cdev.h>
49 #include <linux/seq_file.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/scatterlist.h>
53
54 #include "scsi.h"
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_host.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_ioctl.h>
59 #include <scsi/sg.h>
60
61 #include "scsi_logging.h"
62
63 #ifdef CONFIG_SCSI_PROC_FS
64 #include <linux/proc_fs.h>
65 static char *sg_version_date = "20050908";
66
67 static int sg_proc_init(void);
68 static void sg_proc_cleanup(void);
69 #endif
70
71 #define SG_ALLOW_DIO_DEF 0
72 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
73
74 #define SG_MAX_DEVS 32768
75
76 /*
77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
78 * Then when using 32 bit integers x * m may overflow during the calculation.
79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
80 * calculates the same, but prevents the overflow when both m and d
81 * are "small" numbers (like HZ and USER_HZ).
82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
83 * in 32 bits.
84 */
85 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
86
87 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
88
89 int sg_big_buff = SG_DEF_RESERVED_SIZE;
90 /* N.B. This variable is readable and writeable via
91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
92 of this size (or less if there is not enough memory) will be reserved
93 for use by this file descriptor. [Deprecated usage: this variable is also
94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
95 the kernel (i.e. it is not a module).] */
96 static int def_reserved_size = -1; /* picks up init parameter */
97 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
98
99 #define SG_SECTOR_SZ 512
100 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
101
102 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
103
104 static int sg_add(struct class_device *, struct class_interface *);
105 static void sg_remove(struct class_device *, struct class_interface *);
106
107 static Scsi_Request *dummy_cmdp; /* only used for sizeof */
108
109 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
110 file descriptor list for device */
111
112 static struct class_interface sg_interface = {
113 .add = sg_add,
114 .remove = sg_remove,
115 };
116
117 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
118 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
119 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
120 unsigned bufflen; /* Size of (aggregate) data buffer */
121 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
122 void *buffer; /* Data buffer or scatter list (k_use_sg>0) */
123 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
124 unsigned char cmd_opcode; /* first byte of command */
125 } Sg_scatter_hold;
126
127 struct sg_device; /* forward declarations */
128 struct sg_fd;
129
130 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
131 Scsi_Request *my_cmdp; /* != 0 when request with lower levels */
132 struct sg_request *nextrp; /* NULL -> tail request (slist) */
133 struct sg_fd *parentfp; /* NULL -> not in use */
134 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
135 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
136 unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
137 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
138 char orphan; /* 1 -> drop on sight, 0 -> normal */
139 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
140 volatile char done; /* 0->before bh, 1->before read, 2->read */
141 } Sg_request;
142
143 typedef struct sg_fd { /* holds the state of a file descriptor */
144 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
145 struct sg_device *parentdp; /* owning device */
146 wait_queue_head_t read_wait; /* queue read until command done */
147 rwlock_t rq_list_lock; /* protect access to list in req_arr */
148 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
149 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
150 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
151 unsigned save_scat_len; /* original length of trunc. scat. element */
152 Sg_request *headrp; /* head of request slist, NULL->empty */
153 struct fasync_struct *async_qp; /* used by asynchronous notification */
154 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
155 char low_dma; /* as in parent but possibly overridden to 1 */
156 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
157 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
158 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
159 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
160 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
161 char mmap_called; /* 0 -> mmap() never called on this fd */
162 } Sg_fd;
163
164 typedef struct sg_device { /* holds the state of each scsi generic device */
165 struct scsi_device *device;
166 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
167 int sg_tablesize; /* adapter's max scatter-gather table size */
168 Sg_fd *headfp; /* first open fd belonging to this device */
169 volatile char detached; /* 0->attached, 1->detached pending removal */
170 volatile char exclude; /* opened for exclusive access */
171 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
172 struct gendisk *disk;
173 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
174 } Sg_device;
175
176 static int sg_fasync(int fd, struct file *filp, int mode);
177 static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */
178 static int sg_start_req(Sg_request * srp);
179 static void sg_finish_rem_req(Sg_request * srp);
180 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
181 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
182 int tablesize);
183 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
184 Sg_request * srp);
185 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
186 int blocking, int read_only, Sg_request ** o_srp);
187 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
188 unsigned char *cmnd, int timeout, int blocking);
189 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
190 int wr_xf, int *countp, unsigned char __user **up);
191 static int sg_write_xfer(Sg_request * srp);
192 static int sg_read_xfer(Sg_request * srp);
193 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
194 static void sg_remove_scat(Sg_scatter_hold * schp);
195 static void sg_build_reserve(Sg_fd * sfp, int req_size);
196 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
197 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
198 static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
199 static void sg_page_free(char *buff, int size);
200 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
201 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
202 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
203 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
204 static Sg_request *sg_add_request(Sg_fd * sfp);
205 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
206 static int sg_res_in_use(Sg_fd * sfp);
207 static int sg_allow_access(unsigned char opcode, char dev_type);
208 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
209 static Sg_device *sg_get_dev(int dev);
210 static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp);
211 #ifdef CONFIG_SCSI_PROC_FS
212 static int sg_last_dev(void);
213 #endif
214
215 static Sg_device **sg_dev_arr = NULL;
216 static int sg_dev_max;
217 static int sg_nr_dev;
218
219 #define SZ_SG_HEADER sizeof(struct sg_header)
220 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
221 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
222 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
223
224 static int
225 sg_open(struct inode *inode, struct file *filp)
226 {
227 int dev = iminor(inode);
228 int flags = filp->f_flags;
229 Sg_device *sdp;
230 Sg_fd *sfp;
231 int res;
232 int retval;
233
234 nonseekable_open(inode, filp);
235 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
236 sdp = sg_get_dev(dev);
237 if ((!sdp) || (!sdp->device))
238 return -ENXIO;
239 if (sdp->detached)
240 return -ENODEV;
241
242 /* This driver's module count bumped by fops_get in <linux/fs.h> */
243 /* Prevent the device driver from vanishing while we sleep */
244 retval = scsi_device_get(sdp->device);
245 if (retval)
246 return retval;
247
248 if (!((flags & O_NONBLOCK) ||
249 scsi_block_when_processing_errors(sdp->device))) {
250 retval = -ENXIO;
251 /* we are in error recovery for this device */
252 goto error_out;
253 }
254
255 if (flags & O_EXCL) {
256 if (O_RDONLY == (flags & O_ACCMODE)) {
257 retval = -EPERM; /* Can't lock it with read only access */
258 goto error_out;
259 }
260 if (sdp->headfp && (flags & O_NONBLOCK)) {
261 retval = -EBUSY;
262 goto error_out;
263 }
264 res = 0;
265 __wait_event_interruptible(sdp->o_excl_wait,
266 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
267 if (res) {
268 retval = res; /* -ERESTARTSYS because signal hit process */
269 goto error_out;
270 }
271 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
272 if (flags & O_NONBLOCK) {
273 retval = -EBUSY;
274 goto error_out;
275 }
276 res = 0;
277 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
278 res);
279 if (res) {
280 retval = res; /* -ERESTARTSYS because signal hit process */
281 goto error_out;
282 }
283 }
284 if (sdp->detached) {
285 retval = -ENODEV;
286 goto error_out;
287 }
288 if (!sdp->headfp) { /* no existing opens on this device */
289 sdp->sgdebug = 0;
290 sdp->sg_tablesize = sdp->device->host->sg_tablesize;
291 }
292 if ((sfp = sg_add_sfp(sdp, dev)))
293 filp->private_data = sfp;
294 else {
295 if (flags & O_EXCL)
296 sdp->exclude = 0; /* undo if error */
297 retval = -ENOMEM;
298 goto error_out;
299 }
300 return 0;
301
302 error_out:
303 scsi_device_put(sdp->device);
304 return retval;
305 }
306
307 /* Following function was formerly called 'sg_close' */
308 static int
309 sg_release(struct inode *inode, struct file *filp)
310 {
311 Sg_device *sdp;
312 Sg_fd *sfp;
313
314 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
315 return -ENXIO;
316 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
317 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
318 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
319 if (!sdp->detached) {
320 scsi_device_put(sdp->device);
321 }
322 sdp->exclude = 0;
323 wake_up_interruptible(&sdp->o_excl_wait);
324 }
325 return 0;
326 }
327
328 static ssize_t
329 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
330 {
331 Sg_device *sdp;
332 Sg_fd *sfp;
333 Sg_request *srp;
334 int req_pack_id = -1;
335 sg_io_hdr_t *hp;
336 struct sg_header *old_hdr = NULL;
337 int retval = 0;
338
339 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
340 return -ENXIO;
341 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
342 sdp->disk->disk_name, (int) count));
343 if (!access_ok(VERIFY_WRITE, buf, count))
344 return -EFAULT;
345 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
346 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
347 if (!old_hdr)
348 return -ENOMEM;
349 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
350 retval = -EFAULT;
351 goto free_old_hdr;
352 }
353 if (old_hdr->reply_len < 0) {
354 if (count >= SZ_SG_IO_HDR) {
355 sg_io_hdr_t *new_hdr;
356 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
357 if (!new_hdr) {
358 retval = -ENOMEM;
359 goto free_old_hdr;
360 }
361 retval =__copy_from_user
362 (new_hdr, buf, SZ_SG_IO_HDR);
363 req_pack_id = new_hdr->pack_id;
364 kfree(new_hdr);
365 if (retval) {
366 retval = -EFAULT;
367 goto free_old_hdr;
368 }
369 }
370 } else
371 req_pack_id = old_hdr->pack_id;
372 }
373 srp = sg_get_rq_mark(sfp, req_pack_id);
374 if (!srp) { /* now wait on packet to arrive */
375 if (sdp->detached) {
376 retval = -ENODEV;
377 goto free_old_hdr;
378 }
379 if (filp->f_flags & O_NONBLOCK) {
380 retval = -EAGAIN;
381 goto free_old_hdr;
382 }
383 while (1) {
384 retval = 0; /* following macro beats race condition */
385 __wait_event_interruptible(sfp->read_wait,
386 (sdp->detached ||
387 (srp = sg_get_rq_mark(sfp, req_pack_id))),
388 retval);
389 if (sdp->detached) {
390 retval = -ENODEV;
391 goto free_old_hdr;
392 }
393 if (0 == retval)
394 break;
395
396 /* -ERESTARTSYS as signal hit process */
397 goto free_old_hdr;
398 }
399 }
400 if (srp->header.interface_id != '\0') {
401 retval = sg_new_read(sfp, buf, count, srp);
402 goto free_old_hdr;
403 }
404
405 hp = &srp->header;
406 if (old_hdr == NULL) {
407 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
408 if (! old_hdr) {
409 retval = -ENOMEM;
410 goto free_old_hdr;
411 }
412 }
413 memset(old_hdr, 0, SZ_SG_HEADER);
414 old_hdr->reply_len = (int) hp->timeout;
415 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
416 old_hdr->pack_id = hp->pack_id;
417 old_hdr->twelve_byte =
418 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
419 old_hdr->target_status = hp->masked_status;
420 old_hdr->host_status = hp->host_status;
421 old_hdr->driver_status = hp->driver_status;
422 if ((CHECK_CONDITION & hp->masked_status) ||
423 (DRIVER_SENSE & hp->driver_status))
424 memcpy(old_hdr->sense_buffer, srp->sense_b,
425 sizeof (old_hdr->sense_buffer));
426 switch (hp->host_status) {
427 /* This setup of 'result' is for backward compatibility and is best
428 ignored by the user who should use target, host + driver status */
429 case DID_OK:
430 case DID_PASSTHROUGH:
431 case DID_SOFT_ERROR:
432 old_hdr->result = 0;
433 break;
434 case DID_NO_CONNECT:
435 case DID_BUS_BUSY:
436 case DID_TIME_OUT:
437 old_hdr->result = EBUSY;
438 break;
439 case DID_BAD_TARGET:
440 case DID_ABORT:
441 case DID_PARITY:
442 case DID_RESET:
443 case DID_BAD_INTR:
444 old_hdr->result = EIO;
445 break;
446 case DID_ERROR:
447 old_hdr->result = (srp->sense_b[0] == 0 &&
448 hp->masked_status == GOOD) ? 0 : EIO;
449 break;
450 default:
451 old_hdr->result = EIO;
452 break;
453 }
454
455 /* Now copy the result back to the user buffer. */
456 if (count >= SZ_SG_HEADER) {
457 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
458 retval = -EFAULT;
459 goto free_old_hdr;
460 }
461 buf += SZ_SG_HEADER;
462 if (count > old_hdr->reply_len)
463 count = old_hdr->reply_len;
464 if (count > SZ_SG_HEADER) {
465 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
466 retval = -EFAULT;
467 goto free_old_hdr;
468 }
469 }
470 } else
471 count = (old_hdr->result == 0) ? 0 : -EIO;
472 sg_finish_rem_req(srp);
473 retval = count;
474 free_old_hdr:
475 kfree(old_hdr);
476 return retval;
477 }
478
479 static ssize_t
480 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
481 {
482 sg_io_hdr_t *hp = &srp->header;
483 int err = 0;
484 int len;
485
486 if (count < SZ_SG_IO_HDR) {
487 err = -EINVAL;
488 goto err_out;
489 }
490 hp->sb_len_wr = 0;
491 if ((hp->mx_sb_len > 0) && hp->sbp) {
492 if ((CHECK_CONDITION & hp->masked_status) ||
493 (DRIVER_SENSE & hp->driver_status)) {
494 int sb_len = sizeof (dummy_cmdp->sr_sense_buffer);
495 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
496 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
497 len = (len > sb_len) ? sb_len : len;
498 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
499 err = -EFAULT;
500 goto err_out;
501 }
502 hp->sb_len_wr = len;
503 }
504 }
505 if (hp->masked_status || hp->host_status || hp->driver_status)
506 hp->info |= SG_INFO_CHECK;
507 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
508 err = -EFAULT;
509 goto err_out;
510 }
511 err = sg_read_xfer(srp);
512 err_out:
513 sg_finish_rem_req(srp);
514 return (0 == err) ? count : err;
515 }
516
517 static ssize_t
518 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
519 {
520 int mxsize, cmd_size, k;
521 int input_size, blocking;
522 unsigned char opcode;
523 Sg_device *sdp;
524 Sg_fd *sfp;
525 Sg_request *srp;
526 struct sg_header old_hdr;
527 sg_io_hdr_t *hp;
528 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
529
530 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
531 return -ENXIO;
532 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
533 sdp->disk->disk_name, (int) count));
534 if (sdp->detached)
535 return -ENODEV;
536 if (!((filp->f_flags & O_NONBLOCK) ||
537 scsi_block_when_processing_errors(sdp->device)))
538 return -ENXIO;
539
540 if (!access_ok(VERIFY_READ, buf, count))
541 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
542 if (count < SZ_SG_HEADER)
543 return -EIO;
544 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
545 return -EFAULT;
546 blocking = !(filp->f_flags & O_NONBLOCK);
547 if (old_hdr.reply_len < 0)
548 return sg_new_write(sfp, buf, count, blocking, 0, NULL);
549 if (count < (SZ_SG_HEADER + 6))
550 return -EIO; /* The minimum scsi command length is 6 bytes. */
551
552 if (!(srp = sg_add_request(sfp))) {
553 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
554 return -EDOM;
555 }
556 buf += SZ_SG_HEADER;
557 __get_user(opcode, buf);
558 if (sfp->next_cmd_len > 0) {
559 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
560 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
561 sfp->next_cmd_len = 0;
562 sg_remove_request(sfp, srp);
563 return -EIO;
564 }
565 cmd_size = sfp->next_cmd_len;
566 sfp->next_cmd_len = 0; /* reset so only this write() effected */
567 } else {
568 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
569 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
570 cmd_size = 12;
571 }
572 SCSI_LOG_TIMEOUT(4, printk(
573 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
574 /* Determine buffer size. */
575 input_size = count - cmd_size;
576 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
577 mxsize -= SZ_SG_HEADER;
578 input_size -= SZ_SG_HEADER;
579 if (input_size < 0) {
580 sg_remove_request(sfp, srp);
581 return -EIO; /* User did not pass enough bytes for this command. */
582 }
583 hp = &srp->header;
584 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
585 hp->cmd_len = (unsigned char) cmd_size;
586 hp->iovec_count = 0;
587 hp->mx_sb_len = 0;
588 if (input_size > 0)
589 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
590 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
591 else
592 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
593 hp->dxfer_len = mxsize;
594 hp->dxferp = (char __user *)buf + cmd_size;
595 hp->sbp = NULL;
596 hp->timeout = old_hdr.reply_len; /* structure abuse ... */
597 hp->flags = input_size; /* structure abuse ... */
598 hp->pack_id = old_hdr.pack_id;
599 hp->usr_ptr = NULL;
600 if (__copy_from_user(cmnd, buf, cmd_size))
601 return -EFAULT;
602 /*
603 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
604 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
605 * is a non-zero input_size, so emit a warning.
606 */
607 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
608 if (printk_ratelimit())
609 printk(KERN_WARNING
610 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
611 "guessing data in;\n" KERN_WARNING " "
612 "program %s not setting count and/or reply_len properly\n",
613 old_hdr.reply_len - (int)SZ_SG_HEADER,
614 input_size, (unsigned int) cmnd[0],
615 current->comm);
616 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
617 return (k < 0) ? k : count;
618 }
619
620 static ssize_t
621 sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
622 int blocking, int read_only, Sg_request ** o_srp)
623 {
624 int k;
625 Sg_request *srp;
626 sg_io_hdr_t *hp;
627 unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)];
628 int timeout;
629 unsigned long ul_timeout;
630
631 if (count < SZ_SG_IO_HDR)
632 return -EINVAL;
633 if (!access_ok(VERIFY_READ, buf, count))
634 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
635
636 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
637 if (!(srp = sg_add_request(sfp))) {
638 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
639 return -EDOM;
640 }
641 hp = &srp->header;
642 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
643 sg_remove_request(sfp, srp);
644 return -EFAULT;
645 }
646 if (hp->interface_id != 'S') {
647 sg_remove_request(sfp, srp);
648 return -ENOSYS;
649 }
650 if (hp->flags & SG_FLAG_MMAP_IO) {
651 if (hp->dxfer_len > sfp->reserve.bufflen) {
652 sg_remove_request(sfp, srp);
653 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
654 }
655 if (hp->flags & SG_FLAG_DIRECT_IO) {
656 sg_remove_request(sfp, srp);
657 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
658 }
659 if (sg_res_in_use(sfp)) {
660 sg_remove_request(sfp, srp);
661 return -EBUSY; /* reserve buffer already being used */
662 }
663 }
664 ul_timeout = msecs_to_jiffies(srp->header.timeout);
665 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
666 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
667 sg_remove_request(sfp, srp);
668 return -EMSGSIZE;
669 }
670 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
671 sg_remove_request(sfp, srp);
672 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
673 }
674 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
675 sg_remove_request(sfp, srp);
676 return -EFAULT;
677 }
678 if (read_only &&
679 (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
680 sg_remove_request(sfp, srp);
681 return -EPERM;
682 }
683 k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
684 if (k < 0)
685 return k;
686 if (o_srp)
687 *o_srp = srp;
688 return count;
689 }
690
691 static int
692 sg_common_write(Sg_fd * sfp, Sg_request * srp,
693 unsigned char *cmnd, int timeout, int blocking)
694 {
695 int k;
696 Scsi_Request *SRpnt;
697 Sg_device *sdp = sfp->parentdp;
698 sg_io_hdr_t *hp = &srp->header;
699 request_queue_t *q;
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))) {
713 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
714 sg_finish_rem_req(srp);
715 return k; /* probably out of space --> ENOMEM */
716 }
717 if ((k = sg_write_xfer(srp))) {
718 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
719 sg_finish_rem_req(srp);
720 return k;
721 }
722 if (sdp->detached) {
723 sg_finish_rem_req(srp);
724 return -ENODEV;
725 }
726 SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC);
727 if (SRpnt == NULL) {
728 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
729 sg_finish_rem_req(srp);
730 return -ENOMEM;
731 }
732
733 srp->my_cmdp = SRpnt;
734 q = SRpnt->sr_device->request_queue;
735 SRpnt->sr_request->rq_disk = sdp->disk;
736 SRpnt->sr_sense_buffer[0] = 0;
737 SRpnt->sr_cmd_len = hp->cmd_len;
738 SRpnt->sr_use_sg = srp->data.k_use_sg;
739 SRpnt->sr_sglist_len = srp->data.sglist_len;
740 SRpnt->sr_bufflen = srp->data.bufflen;
741 SRpnt->sr_underflow = 0;
742 SRpnt->sr_buffer = srp->data.buffer;
743 switch (hp->dxfer_direction) {
744 case SG_DXFER_TO_FROM_DEV:
745 case SG_DXFER_FROM_DEV:
746 SRpnt->sr_data_direction = DMA_FROM_DEVICE;
747 break;
748 case SG_DXFER_TO_DEV:
749 SRpnt->sr_data_direction = DMA_TO_DEVICE;
750 break;
751 case SG_DXFER_UNKNOWN:
752 SRpnt->sr_data_direction = DMA_BIDIRECTIONAL;
753 break;
754 default:
755 SRpnt->sr_data_direction = DMA_NONE;
756 break;
757 }
758 SRpnt->upper_private_data = srp;
759 srp->data.k_use_sg = 0;
760 srp->data.sglist_len = 0;
761 srp->data.bufflen = 0;
762 srp->data.buffer = NULL;
763 hp->duration = jiffies_to_msecs(jiffies);
764 /* Now send everything of to mid-level. The next time we hear about this
765 packet is when sg_cmd_done() is called (i.e. a callback). */
766 scsi_do_req(SRpnt, (void *) cmnd,
767 (void *) SRpnt->sr_buffer, hp->dxfer_len,
768 sg_cmd_done, timeout, SG_DEFAULT_RETRIES);
769 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
770 return 0;
771 }
772
773 static int
774 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
775 {
776 unsigned long iflags;
777 int done;
778
779 read_lock_irqsave(&sfp->rq_list_lock, iflags);
780 done = srp->done;
781 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
782 return done;
783 }
784
785 static int
786 sg_ioctl(struct inode *inode, struct file *filp,
787 unsigned int cmd_in, unsigned long arg)
788 {
789 void __user *p = (void __user *)arg;
790 int __user *ip = p;
791 int result, val, read_only;
792 Sg_device *sdp;
793 Sg_fd *sfp;
794 Sg_request *srp;
795 unsigned long iflags;
796
797 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
798 return -ENXIO;
799 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
800 sdp->disk->disk_name, (int) cmd_in));
801 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
802
803 switch (cmd_in) {
804 case SG_IO:
805 {
806 int blocking = 1; /* ignore O_NONBLOCK flag */
807
808 if (sdp->detached)
809 return -ENODEV;
810 if (!scsi_block_when_processing_errors(sdp->device))
811 return -ENXIO;
812 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
813 return -EFAULT;
814 result =
815 sg_new_write(sfp, p, SZ_SG_IO_HDR,
816 blocking, read_only, &srp);
817 if (result < 0)
818 return result;
819 srp->sg_io_owned = 1;
820 while (1) {
821 result = 0; /* following macro to beat race condition */
822 __wait_event_interruptible(sfp->read_wait,
823 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
824 result);
825 if (sdp->detached)
826 return -ENODEV;
827 if (sfp->closed)
828 return 0; /* request packet dropped already */
829 if (0 == result)
830 break;
831 srp->orphan = 1;
832 return result; /* -ERESTARTSYS because signal hit process */
833 }
834 write_lock_irqsave(&sfp->rq_list_lock, iflags);
835 srp->done = 2;
836 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
837 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
838 return (result < 0) ? result : 0;
839 }
840 case SG_SET_TIMEOUT:
841 result = get_user(val, ip);
842 if (result)
843 return result;
844 if (val < 0)
845 return -EIO;
846 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
847 val = MULDIV (INT_MAX, USER_HZ, HZ);
848 sfp->timeout_user = val;
849 sfp->timeout = MULDIV (val, HZ, USER_HZ);
850
851 return 0;
852 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
853 /* strange ..., for backward compatibility */
854 return sfp->timeout_user;
855 case SG_SET_FORCE_LOW_DMA:
856 result = get_user(val, ip);
857 if (result)
858 return result;
859 if (val) {
860 sfp->low_dma = 1;
861 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
862 val = (int) sfp->reserve.bufflen;
863 sg_remove_scat(&sfp->reserve);
864 sg_build_reserve(sfp, val);
865 }
866 } else {
867 if (sdp->detached)
868 return -ENODEV;
869 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
870 }
871 return 0;
872 case SG_GET_LOW_DMA:
873 return put_user((int) sfp->low_dma, ip);
874 case SG_GET_SCSI_ID:
875 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
876 return -EFAULT;
877 else {
878 sg_scsi_id_t __user *sg_idp = p;
879
880 if (sdp->detached)
881 return -ENODEV;
882 __put_user((int) sdp->device->host->host_no,
883 &sg_idp->host_no);
884 __put_user((int) sdp->device->channel,
885 &sg_idp->channel);
886 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
887 __put_user((int) sdp->device->lun, &sg_idp->lun);
888 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
889 __put_user((short) sdp->device->host->cmd_per_lun,
890 &sg_idp->h_cmd_per_lun);
891 __put_user((short) sdp->device->queue_depth,
892 &sg_idp->d_queue_depth);
893 __put_user(0, &sg_idp->unused[0]);
894 __put_user(0, &sg_idp->unused[1]);
895 return 0;
896 }
897 case SG_SET_FORCE_PACK_ID:
898 result = get_user(val, ip);
899 if (result)
900 return result;
901 sfp->force_packid = val ? 1 : 0;
902 return 0;
903 case SG_GET_PACK_ID:
904 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
905 return -EFAULT;
906 read_lock_irqsave(&sfp->rq_list_lock, iflags);
907 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
908 if ((1 == srp->done) && (!srp->sg_io_owned)) {
909 read_unlock_irqrestore(&sfp->rq_list_lock,
910 iflags);
911 __put_user(srp->header.pack_id, ip);
912 return 0;
913 }
914 }
915 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
916 __put_user(-1, ip);
917 return 0;
918 case SG_GET_NUM_WAITING:
919 read_lock_irqsave(&sfp->rq_list_lock, iflags);
920 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
921 if ((1 == srp->done) && (!srp->sg_io_owned))
922 ++val;
923 }
924 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
925 return put_user(val, ip);
926 case SG_GET_SG_TABLESIZE:
927 return put_user(sdp->sg_tablesize, ip);
928 case SG_SET_RESERVED_SIZE:
929 result = get_user(val, ip);
930 if (result)
931 return result;
932 if (val < 0)
933 return -EINVAL;
934 if (val != sfp->reserve.bufflen) {
935 if (sg_res_in_use(sfp) || sfp->mmap_called)
936 return -EBUSY;
937 sg_remove_scat(&sfp->reserve);
938 sg_build_reserve(sfp, val);
939 }
940 return 0;
941 case SG_GET_RESERVED_SIZE:
942 val = (int) sfp->reserve.bufflen;
943 return put_user(val, ip);
944 case SG_SET_COMMAND_Q:
945 result = get_user(val, ip);
946 if (result)
947 return result;
948 sfp->cmd_q = val ? 1 : 0;
949 return 0;
950 case SG_GET_COMMAND_Q:
951 return put_user((int) sfp->cmd_q, ip);
952 case SG_SET_KEEP_ORPHAN:
953 result = get_user(val, ip);
954 if (result)
955 return result;
956 sfp->keep_orphan = val;
957 return 0;
958 case SG_GET_KEEP_ORPHAN:
959 return put_user((int) sfp->keep_orphan, ip);
960 case SG_NEXT_CMD_LEN:
961 result = get_user(val, ip);
962 if (result)
963 return result;
964 sfp->next_cmd_len = (val > 0) ? val : 0;
965 return 0;
966 case SG_GET_VERSION_NUM:
967 return put_user(sg_version_num, ip);
968 case SG_GET_ACCESS_COUNT:
969 /* faked - we don't have a real access count anymore */
970 val = (sdp->device ? 1 : 0);
971 return put_user(val, ip);
972 case SG_GET_REQUEST_TABLE:
973 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
974 return -EFAULT;
975 else {
976 sg_req_info_t *rinfo;
977 unsigned int ms;
978
979 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
980 GFP_KERNEL);
981 if (!rinfo)
982 return -ENOMEM;
983 read_lock_irqsave(&sfp->rq_list_lock, iflags);
984 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
985 ++val, srp = srp ? srp->nextrp : srp) {
986 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
987 if (srp) {
988 rinfo[val].req_state = srp->done + 1;
989 rinfo[val].problem =
990 srp->header.masked_status &
991 srp->header.host_status &
992 srp->header.driver_status;
993 if (srp->done)
994 rinfo[val].duration =
995 srp->header.duration;
996 else {
997 ms = jiffies_to_msecs(jiffies);
998 rinfo[val].duration =
999 (ms > srp->header.duration) ?
1000 (ms - srp->header.duration) : 0;
1001 }
1002 rinfo[val].orphan = srp->orphan;
1003 rinfo[val].sg_io_owned =
1004 srp->sg_io_owned;
1005 rinfo[val].pack_id =
1006 srp->header.pack_id;
1007 rinfo[val].usr_ptr =
1008 srp->header.usr_ptr;
1009 }
1010 }
1011 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1012 result = __copy_to_user(p, rinfo,
1013 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1014 result = result ? -EFAULT : 0;
1015 kfree(rinfo);
1016 return result;
1017 }
1018 case SG_EMULATED_HOST:
1019 if (sdp->detached)
1020 return -ENODEV;
1021 return put_user(sdp->device->host->hostt->emulated, ip);
1022 case SG_SCSI_RESET:
1023 if (sdp->detached)
1024 return -ENODEV;
1025 if (filp->f_flags & O_NONBLOCK) {
1026 if (scsi_host_in_recovery(sdp->device->host))
1027 return -EBUSY;
1028 } else if (!scsi_block_when_processing_errors(sdp->device))
1029 return -EBUSY;
1030 result = get_user(val, ip);
1031 if (result)
1032 return result;
1033 if (SG_SCSI_RESET_NOTHING == val)
1034 return 0;
1035 switch (val) {
1036 case SG_SCSI_RESET_DEVICE:
1037 val = SCSI_TRY_RESET_DEVICE;
1038 break;
1039 case SG_SCSI_RESET_BUS:
1040 val = SCSI_TRY_RESET_BUS;
1041 break;
1042 case SG_SCSI_RESET_HOST:
1043 val = SCSI_TRY_RESET_HOST;
1044 break;
1045 default:
1046 return -EINVAL;
1047 }
1048 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1049 return -EACCES;
1050 return (scsi_reset_provider(sdp->device, val) ==
1051 SUCCESS) ? 0 : -EIO;
1052 case SCSI_IOCTL_SEND_COMMAND:
1053 if (sdp->detached)
1054 return -ENODEV;
1055 if (read_only) {
1056 unsigned char opcode = WRITE_6;
1057 Scsi_Ioctl_Command __user *siocp = p;
1058
1059 if (copy_from_user(&opcode, siocp->data, 1))
1060 return -EFAULT;
1061 if (!sg_allow_access(opcode, sdp->device->type))
1062 return -EPERM;
1063 }
1064 return scsi_ioctl_send_command(sdp->device, p);
1065 case SG_SET_DEBUG:
1066 result = get_user(val, ip);
1067 if (result)
1068 return result;
1069 sdp->sgdebug = (char) val;
1070 return 0;
1071 case SCSI_IOCTL_GET_IDLUN:
1072 case SCSI_IOCTL_GET_BUS_NUMBER:
1073 case SCSI_IOCTL_PROBE_HOST:
1074 case SG_GET_TRANSFORM:
1075 if (sdp->detached)
1076 return -ENODEV;
1077 return scsi_ioctl(sdp->device, cmd_in, p);
1078 default:
1079 if (read_only)
1080 return -EPERM; /* don't know so take safe approach */
1081 return scsi_ioctl(sdp->device, cmd_in, p);
1082 }
1083 }
1084
1085 #ifdef CONFIG_COMPAT
1086 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1087 {
1088 Sg_device *sdp;
1089 Sg_fd *sfp;
1090 struct scsi_device *sdev;
1091
1092 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1093 return -ENXIO;
1094
1095 sdev = sdp->device;
1096 if (sdev->host->hostt->compat_ioctl) {
1097 int ret;
1098
1099 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1100
1101 return ret;
1102 }
1103
1104 return -ENOIOCTLCMD;
1105 }
1106 #endif
1107
1108 static unsigned int
1109 sg_poll(struct file *filp, poll_table * wait)
1110 {
1111 unsigned int res = 0;
1112 Sg_device *sdp;
1113 Sg_fd *sfp;
1114 Sg_request *srp;
1115 int count = 0;
1116 unsigned long iflags;
1117
1118 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1119 || sfp->closed)
1120 return POLLERR;
1121 poll_wait(filp, &sfp->read_wait, wait);
1122 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1123 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1124 /* if any read waiting, flag it */
1125 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1126 res = POLLIN | POLLRDNORM;
1127 ++count;
1128 }
1129 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1130
1131 if (sdp->detached)
1132 res |= POLLHUP;
1133 else if (!sfp->cmd_q) {
1134 if (0 == count)
1135 res |= POLLOUT | POLLWRNORM;
1136 } else if (count < SG_MAX_QUEUE)
1137 res |= POLLOUT | POLLWRNORM;
1138 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1139 sdp->disk->disk_name, (int) res));
1140 return res;
1141 }
1142
1143 static int
1144 sg_fasync(int fd, struct file *filp, int mode)
1145 {
1146 int retval;
1147 Sg_device *sdp;
1148 Sg_fd *sfp;
1149
1150 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1151 return -ENXIO;
1152 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1153 sdp->disk->disk_name, mode));
1154
1155 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1156 return (retval < 0) ? retval : 0;
1157 }
1158
1159 static inline unsigned char *
1160 sg_scatg2virt(const struct scatterlist *sclp)
1161 {
1162 return (sclp && sclp->page) ?
1163 (unsigned char *) page_address(sclp->page) + sclp->offset : NULL;
1164 }
1165
1166 /* When startFinish==1 increments page counts for pages other than the
1167 first of scatter gather elements obtained from __get_free_pages().
1168 When startFinish==0 decrements ... */
1169 static void
1170 sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish)
1171 {
1172 void *page_ptr;
1173 struct page *page;
1174 int k, m;
1175
1176 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1177 startFinish, rsv_schp->k_use_sg));
1178 /* N.B. correction _not_ applied to base page of each allocation */
1179 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1180 struct scatterlist *sclp = rsv_schp->buffer;
1181
1182 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
1183 for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) {
1184 page_ptr = sg_scatg2virt(sclp) + m;
1185 page = virt_to_page(page_ptr);
1186 if (startFinish)
1187 get_page(page);
1188 else {
1189 if (page_count(page) > 0)
1190 __put_page(page);
1191 }
1192 }
1193 }
1194 } else { /* reserve buffer is just a single allocation */
1195 for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) {
1196 page_ptr = (unsigned char *) rsv_schp->buffer + m;
1197 page = virt_to_page(page_ptr);
1198 if (startFinish)
1199 get_page(page);
1200 else {
1201 if (page_count(page) > 0)
1202 __put_page(page);
1203 }
1204 }
1205 }
1206 }
1207
1208 static struct page *
1209 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1210 {
1211 Sg_fd *sfp;
1212 struct page *page = NOPAGE_SIGBUS;
1213 void *page_ptr = NULL;
1214 unsigned long offset;
1215 Sg_scatter_hold *rsv_schp;
1216
1217 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1218 return page;
1219 rsv_schp = &sfp->reserve;
1220 offset = addr - vma->vm_start;
1221 if (offset >= rsv_schp->bufflen)
1222 return page;
1223 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1224 offset, rsv_schp->k_use_sg));
1225 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1226 int k;
1227 unsigned long sa = vma->vm_start;
1228 unsigned long len;
1229 struct scatterlist *sclp = rsv_schp->buffer;
1230
1231 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1232 ++k, ++sclp) {
1233 len = vma->vm_end - sa;
1234 len = (len < sclp->length) ? len : sclp->length;
1235 if (offset < len) {
1236 page_ptr = sg_scatg2virt(sclp) + offset;
1237 page = virt_to_page(page_ptr);
1238 get_page(page); /* increment page count */
1239 break;
1240 }
1241 sa += len;
1242 offset -= len;
1243 }
1244 } else { /* reserve buffer is just a single allocation */
1245 page_ptr = (unsigned char *) rsv_schp->buffer + offset;
1246 page = virt_to_page(page_ptr);
1247 get_page(page); /* increment page count */
1248 }
1249 if (type)
1250 *type = VM_FAULT_MINOR;
1251 return page;
1252 }
1253
1254 static struct vm_operations_struct sg_mmap_vm_ops = {
1255 .nopage = sg_vma_nopage,
1256 };
1257
1258 static int
1259 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1260 {
1261 Sg_fd *sfp;
1262 unsigned long req_sz;
1263 Sg_scatter_hold *rsv_schp;
1264
1265 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1266 return -ENXIO;
1267 req_sz = vma->vm_end - vma->vm_start;
1268 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1269 (void *) vma->vm_start, (int) req_sz));
1270 if (vma->vm_pgoff)
1271 return -EINVAL; /* want no offset */
1272 rsv_schp = &sfp->reserve;
1273 if (req_sz > rsv_schp->bufflen)
1274 return -ENOMEM; /* cannot map more than reserved buffer */
1275
1276 if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */
1277 int k;
1278 unsigned long sa = vma->vm_start;
1279 unsigned long len;
1280 struct scatterlist *sclp = rsv_schp->buffer;
1281
1282 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1283 ++k, ++sclp) {
1284 if (0 != sclp->offset)
1285 return -EFAULT; /* non page aligned memory ?? */
1286 len = vma->vm_end - sa;
1287 len = (len < sclp->length) ? len : sclp->length;
1288 sa += len;
1289 }
1290 } else { /* reserve buffer is just a single allocation */
1291 if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1))
1292 return -EFAULT; /* non page aligned memory ?? */
1293 }
1294 if (0 == sfp->mmap_called) {
1295 sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */
1296 sfp->mmap_called = 1;
1297 }
1298 vma->vm_flags |= VM_RESERVED;
1299 vma->vm_private_data = sfp;
1300 vma->vm_ops = &sg_mmap_vm_ops;
1301 return 0;
1302 }
1303
1304 /* This function is a "bottom half" handler that is called by the
1305 * mid level when a command is completed (or has failed). */
1306 static void
1307 sg_cmd_done(Scsi_Cmnd * SCpnt)
1308 {
1309 Scsi_Request *SRpnt = NULL;
1310 Sg_device *sdp = NULL;
1311 Sg_fd *sfp;
1312 Sg_request *srp = NULL;
1313 unsigned long iflags;
1314 unsigned int ms;
1315
1316 if (SCpnt && (SRpnt = SCpnt->sc_request))
1317 srp = (Sg_request *) SRpnt->upper_private_data;
1318 if (NULL == srp) {
1319 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1320 if (SRpnt)
1321 scsi_release_request(SRpnt);
1322 return;
1323 }
1324 sfp = srp->parentfp;
1325 if (sfp)
1326 sdp = sfp->parentdp;
1327 if ((NULL == sdp) || sdp->detached) {
1328 printk(KERN_INFO "sg_cmd_done: device detached\n");
1329 scsi_release_request(SRpnt);
1330 return;
1331 }
1332
1333 /* First transfer ownership of data buffers to sg_device object. */
1334 srp->data.k_use_sg = SRpnt->sr_use_sg;
1335 srp->data.sglist_len = SRpnt->sr_sglist_len;
1336 srp->data.bufflen = SRpnt->sr_bufflen;
1337 srp->data.buffer = SRpnt->sr_buffer;
1338 /* now clear out request structure */
1339 SRpnt->sr_use_sg = 0;
1340 SRpnt->sr_sglist_len = 0;
1341 SRpnt->sr_bufflen = 0;
1342 SRpnt->sr_buffer = NULL;
1343 SRpnt->sr_underflow = 0;
1344 SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */
1345
1346 srp->my_cmdp = NULL;
1347
1348 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1349 sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result));
1350 srp->header.resid = SCpnt->resid;
1351 ms = jiffies_to_msecs(jiffies);
1352 srp->header.duration = (ms > srp->header.duration) ?
1353 (ms - srp->header.duration) : 0;
1354 if (0 != SRpnt->sr_result) {
1355 struct scsi_sense_hdr sshdr;
1356
1357 memcpy(srp->sense_b, SRpnt->sr_sense_buffer,
1358 sizeof (srp->sense_b));
1359 srp->header.status = 0xff & SRpnt->sr_result;
1360 srp->header.masked_status = status_byte(SRpnt->sr_result);
1361 srp->header.msg_status = msg_byte(SRpnt->sr_result);
1362 srp->header.host_status = host_byte(SRpnt->sr_result);
1363 srp->header.driver_status = driver_byte(SRpnt->sr_result);
1364 if ((sdp->sgdebug > 0) &&
1365 ((CHECK_CONDITION == srp->header.masked_status) ||
1366 (COMMAND_TERMINATED == srp->header.masked_status)))
1367 scsi_print_req_sense("sg_cmd_done", SRpnt);
1368
1369 /* Following if statement is a patch supplied by Eric Youngdale */
1370 if (driver_byte(SRpnt->sr_result) != 0
1371 && scsi_command_normalize_sense(SCpnt, &sshdr)
1372 && !scsi_sense_is_deferred(&sshdr)
1373 && sshdr.sense_key == UNIT_ATTENTION
1374 && sdp->device->removable) {
1375 /* Detected possible disc change. Set the bit - this */
1376 /* may be used if there are filesystems using this device */
1377 sdp->device->changed = 1;
1378 }
1379 }
1380 /* Rely on write phase to clean out srp status values, so no "else" */
1381
1382 scsi_release_request(SRpnt);
1383 SRpnt = NULL;
1384 if (sfp->closed) { /* whoops this fd already released, cleanup */
1385 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1386 sg_finish_rem_req(srp);
1387 srp = NULL;
1388 if (NULL == sfp->headrp) {
1389 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1390 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1391 scsi_device_put(sdp->device);
1392 }
1393 sfp = NULL;
1394 }
1395 } else if (srp && srp->orphan) {
1396 if (sfp->keep_orphan)
1397 srp->sg_io_owned = 0;
1398 else {
1399 sg_finish_rem_req(srp);
1400 srp = NULL;
1401 }
1402 }
1403 if (sfp && srp) {
1404 /* Now wake up any sg_read() that is waiting for this packet. */
1405 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1406 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1407 srp->done = 1;
1408 wake_up_interruptible(&sfp->read_wait);
1409 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1410 }
1411 }
1412
1413 static struct file_operations sg_fops = {
1414 .owner = THIS_MODULE,
1415 .read = sg_read,
1416 .write = sg_write,
1417 .poll = sg_poll,
1418 .ioctl = sg_ioctl,
1419 #ifdef CONFIG_COMPAT
1420 .compat_ioctl = sg_compat_ioctl,
1421 #endif
1422 .open = sg_open,
1423 .mmap = sg_mmap,
1424 .release = sg_release,
1425 .fasync = sg_fasync,
1426 };
1427
1428 static struct class *sg_sysfs_class;
1429
1430 static int sg_sysfs_valid = 0;
1431
1432 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1433 {
1434 Sg_device *sdp;
1435 unsigned long iflags;
1436 void *old_sg_dev_arr = NULL;
1437 int k, error;
1438
1439 sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL);
1440 if (!sdp) {
1441 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1442 return -ENOMEM;
1443 }
1444
1445 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1446 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1447 Sg_device **tmp_da;
1448 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1449 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1450
1451 tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1452 if (unlikely(!tmp_da))
1453 goto expand_failed;
1454
1455 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1456 memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
1457 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1458 old_sg_dev_arr = sg_dev_arr;
1459 sg_dev_arr = tmp_da;
1460 sg_dev_max = tmp_dev_max;
1461 }
1462
1463 for (k = 0; k < sg_dev_max; k++)
1464 if (!sg_dev_arr[k])
1465 break;
1466 if (unlikely(k >= SG_MAX_DEVS))
1467 goto overflow;
1468
1469 memset(sdp, 0, sizeof(*sdp));
1470 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1471 sprintf(disk->disk_name, "sg%d", k);
1472 disk->first_minor = k;
1473 sdp->disk = disk;
1474 sdp->device = scsidp;
1475 init_waitqueue_head(&sdp->o_excl_wait);
1476 sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0;
1477
1478 sg_nr_dev++;
1479 sg_dev_arr[k] = sdp;
1480 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1481 error = k;
1482
1483 out:
1484 if (error < 0)
1485 kfree(sdp);
1486 kfree(old_sg_dev_arr);
1487 return error;
1488
1489 expand_failed:
1490 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1491 error = -ENOMEM;
1492 goto out;
1493
1494 overflow:
1495 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1496 sdev_printk(KERN_WARNING, scsidp,
1497 "Unable to attach sg device type=%d, minor "
1498 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1499 error = -ENODEV;
1500 goto out;
1501 }
1502
1503 static int
1504 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
1505 {
1506 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1507 struct gendisk *disk;
1508 Sg_device *sdp = NULL;
1509 struct cdev * cdev = NULL;
1510 int error, k;
1511
1512 disk = alloc_disk(1);
1513 if (!disk) {
1514 printk(KERN_WARNING "alloc_disk failed\n");
1515 return -ENOMEM;
1516 }
1517 disk->major = SCSI_GENERIC_MAJOR;
1518
1519 error = -ENOMEM;
1520 cdev = cdev_alloc();
1521 if (!cdev) {
1522 printk(KERN_WARNING "cdev_alloc failed\n");
1523 goto out;
1524 }
1525 cdev->owner = THIS_MODULE;
1526 cdev->ops = &sg_fops;
1527
1528 error = sg_alloc(disk, scsidp);
1529 if (error < 0) {
1530 printk(KERN_WARNING "sg_alloc failed\n");
1531 goto out;
1532 }
1533 k = error;
1534 sdp = sg_dev_arr[k];
1535
1536 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
1537 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
1538 "%s/generic", scsidp->devfs_name);
1539 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1540 if (error) {
1541 devfs_remove("%s/generic", scsidp->devfs_name);
1542 goto out;
1543 }
1544 sdp->cdev = cdev;
1545 if (sg_sysfs_valid) {
1546 struct class_device * sg_class_member;
1547
1548 sg_class_member = class_device_create(sg_sysfs_class, NULL,
1549 MKDEV(SCSI_GENERIC_MAJOR, k),
1550 cl_dev->dev, "%s",
1551 disk->disk_name);
1552 if (IS_ERR(sg_class_member))
1553 printk(KERN_WARNING "sg_add: "
1554 "class_device_create failed\n");
1555 class_set_devdata(sg_class_member, sdp);
1556 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1557 &sg_class_member->kobj, "generic");
1558 if (error)
1559 printk(KERN_ERR "sg_add: unable to make symlink "
1560 "'generic' back to sg%d\n", k);
1561 } else
1562 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1563
1564 sdev_printk(KERN_NOTICE, scsidp,
1565 "Attached scsi generic sg%d type %d\n", k,scsidp->type);
1566
1567 return 0;
1568
1569 out:
1570 put_disk(disk);
1571 if (cdev)
1572 cdev_del(cdev);
1573 return error;
1574 }
1575
1576 static void
1577 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1578 {
1579 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1580 Sg_device *sdp = NULL;
1581 unsigned long iflags;
1582 Sg_fd *sfp;
1583 Sg_fd *tsfp;
1584 Sg_request *srp;
1585 Sg_request *tsrp;
1586 int k, delay;
1587
1588 if (NULL == sg_dev_arr)
1589 return;
1590 delay = 0;
1591 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1592 for (k = 0; k < sg_dev_max; k++) {
1593 sdp = sg_dev_arr[k];
1594 if ((NULL == sdp) || (sdp->device != scsidp))
1595 continue; /* dirty but lowers nesting */
1596 if (sdp->headfp) {
1597 sdp->detached = 1;
1598 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1599 tsfp = sfp->nextfp;
1600 for (srp = sfp->headrp; srp; srp = tsrp) {
1601 tsrp = srp->nextrp;
1602 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1603 sg_finish_rem_req(srp);
1604 }
1605 if (sfp->closed) {
1606 scsi_device_put(sdp->device);
1607 __sg_remove_sfp(sdp, sfp);
1608 } else {
1609 delay = 1;
1610 wake_up_interruptible(&sfp->read_wait);
1611 kill_fasync(&sfp->async_qp, SIGPOLL,
1612 POLL_HUP);
1613 }
1614 }
1615 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1616 if (NULL == sdp->headfp) {
1617 sg_dev_arr[k] = NULL;
1618 }
1619 } else { /* nothing active, simple case */
1620 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1621 sg_dev_arr[k] = NULL;
1622 }
1623 sg_nr_dev--;
1624 break;
1625 }
1626 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1627
1628 if (sdp) {
1629 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1630 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k));
1631 cdev_del(sdp->cdev);
1632 sdp->cdev = NULL;
1633 devfs_remove("%s/generic", scsidp->devfs_name);
1634 put_disk(sdp->disk);
1635 sdp->disk = NULL;
1636 if (NULL == sdp->headfp)
1637 kfree((char *) sdp);
1638 }
1639
1640 if (delay)
1641 msleep(10); /* dirty detach so delay device destruction */
1642 }
1643
1644 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1645 * of sysfs parameters (which module_param doesn't yet support).
1646 * Sysfs parameters defined explicitly below.
1647 */
1648 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
1649 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1650
1651 MODULE_AUTHOR("Douglas Gilbert");
1652 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1653 MODULE_LICENSE("GPL");
1654 MODULE_VERSION(SG_VERSION_STR);
1655
1656 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1657 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1658
1659 static int __init
1660 init_sg(void)
1661 {
1662 int rc;
1663
1664 if (def_reserved_size >= 0)
1665 sg_big_buff = def_reserved_size;
1666
1667 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1668 SG_MAX_DEVS, "sg");
1669 if (rc)
1670 return rc;
1671 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1672 if ( IS_ERR(sg_sysfs_class) ) {
1673 rc = PTR_ERR(sg_sysfs_class);
1674 goto err_out;
1675 }
1676 sg_sysfs_valid = 1;
1677 rc = scsi_register_interface(&sg_interface);
1678 if (0 == rc) {
1679 #ifdef CONFIG_SCSI_PROC_FS
1680 sg_proc_init();
1681 #endif /* CONFIG_SCSI_PROC_FS */
1682 return 0;
1683 }
1684 class_destroy(sg_sysfs_class);
1685 err_out:
1686 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1687 return rc;
1688 }
1689
1690 static void __exit
1691 exit_sg(void)
1692 {
1693 #ifdef CONFIG_SCSI_PROC_FS
1694 sg_proc_cleanup();
1695 #endif /* CONFIG_SCSI_PROC_FS */
1696 scsi_unregister_interface(&sg_interface);
1697 class_destroy(sg_sysfs_class);
1698 sg_sysfs_valid = 0;
1699 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1700 SG_MAX_DEVS);
1701 kfree((char *)sg_dev_arr);
1702 sg_dev_arr = NULL;
1703 sg_dev_max = 0;
1704 }
1705
1706 static int
1707 sg_start_req(Sg_request * srp)
1708 {
1709 int res;
1710 Sg_fd *sfp = srp->parentfp;
1711 sg_io_hdr_t *hp = &srp->header;
1712 int dxfer_len = (int) hp->dxfer_len;
1713 int dxfer_dir = hp->dxfer_direction;
1714 Sg_scatter_hold *req_schp = &srp->data;
1715 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1716
1717 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1718 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1719 return 0;
1720 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1721 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1722 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1723 res = sg_build_direct(srp, sfp, dxfer_len);
1724 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1725 return res;
1726 }
1727 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1728 sg_link_reserve(sfp, srp, dxfer_len);
1729 else {
1730 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1731 if (res) {
1732 sg_remove_scat(req_schp);
1733 return res;
1734 }
1735 }
1736 return 0;
1737 }
1738
1739 static void
1740 sg_finish_rem_req(Sg_request * srp)
1741 {
1742 Sg_fd *sfp = srp->parentfp;
1743 Sg_scatter_hold *req_schp = &srp->data;
1744
1745 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1746 if (srp->res_used)
1747 sg_unlink_reserve(sfp, srp);
1748 else
1749 sg_remove_scat(req_schp);
1750 sg_remove_request(sfp, srp);
1751 }
1752
1753 static int
1754 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1755 {
1756 int ret_sz;
1757 int elem_sz = sizeof (struct scatterlist);
1758 int sg_bufflen = tablesize * elem_sz;
1759 int mx_sc_elems = tablesize;
1760
1761 schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz);
1762 if (!schp->buffer)
1763 return -ENOMEM;
1764 else if (ret_sz != sg_bufflen) {
1765 sg_bufflen = ret_sz;
1766 mx_sc_elems = sg_bufflen / elem_sz;
1767 }
1768 schp->sglist_len = sg_bufflen;
1769 memset(schp->buffer, 0, sg_bufflen);
1770 return mx_sc_elems; /* number of scat_gath elements allocated */
1771 }
1772
1773 #ifdef SG_ALLOW_DIO_CODE
1774 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1775 /* hopefully this generic code will moved to a library */
1776
1777 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1778 - mapping of all pages not successful
1779 - any page is above max_pfn
1780 (i.e., either completely successful or fails)
1781 */
1782 static int
1783 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1784 unsigned long uaddr, size_t count, int rw,
1785 unsigned long max_pfn)
1786 {
1787 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1788 unsigned long start = uaddr >> PAGE_SHIFT;
1789 const int nr_pages = end - start;
1790 int res, i, j;
1791 struct page **pages;
1792
1793 /* User attempted Overflow! */
1794 if ((uaddr + count) < uaddr)
1795 return -EINVAL;
1796
1797 /* Too big */
1798 if (nr_pages > max_pages)
1799 return -ENOMEM;
1800
1801 /* Hmm? */
1802 if (count == 0)
1803 return 0;
1804
1805 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1806 return -ENOMEM;
1807
1808 /* Try to fault in all of the necessary pages */
1809 down_read(&current->mm->mmap_sem);
1810 /* rw==READ means read from drive, write into memory area */
1811 res = get_user_pages(
1812 current,
1813 current->mm,
1814 uaddr,
1815 nr_pages,
1816 rw == READ,
1817 0, /* don't force */
1818 pages,
1819 NULL);
1820 up_read(&current->mm->mmap_sem);
1821
1822 /* Errors and no page mapped should return here */
1823 if (res < nr_pages)
1824 goto out_unmap;
1825
1826 for (i=0; i < nr_pages; i++) {
1827 /* FIXME: flush superflous for rw==READ,
1828 * probably wrong function for rw==WRITE
1829 */
1830 flush_dcache_page(pages[i]);
1831 if (page_to_pfn(pages[i]) > max_pfn)
1832 goto out_unlock;
1833 /* ?? Is locking needed? I don't think so */
1834 /* if (TestSetPageLocked(pages[i]))
1835 goto out_unlock; */
1836 }
1837
1838 /* Populate the scatter/gather list */
1839 sgl[0].page = pages[0];
1840 sgl[0].offset = uaddr & ~PAGE_MASK;
1841 if (nr_pages > 1) {
1842 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1843 count -= sgl[0].length;
1844 for (i=1; i < nr_pages ; i++) {
1845 sgl[i].offset = 0;
1846 sgl[i].page = pages[i];
1847 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1848 count -= PAGE_SIZE;
1849 }
1850 }
1851 else {
1852 sgl[0].length = count;
1853 }
1854
1855 kfree(pages);
1856 return nr_pages;
1857
1858 out_unlock:
1859 /* for (j=0; j < i; j++)
1860 unlock_page(pages[j]); */
1861 res = 0;
1862 out_unmap:
1863 if (res > 0) {
1864 for (j=0; j < res; j++)
1865 page_cache_release(pages[j]);
1866 res = 0;
1867 }
1868 kfree(pages);
1869 return res;
1870 }
1871
1872
1873 /* And unmap them... */
1874 static int
1875 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1876 int dirtied)
1877 {
1878 int i;
1879
1880 for (i=0; i < nr_pages; i++) {
1881 struct page *page = sgl[i].page;
1882
1883 if (dirtied)
1884 SetPageDirty(page);
1885 /* unlock_page(page); */
1886 /* FIXME: cache flush missing for rw==READ
1887 * FIXME: call the correct reference counting function
1888 */
1889 page_cache_release(page);
1890 }
1891
1892 return 0;
1893 }
1894
1895 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1896 #endif
1897
1898
1899 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1900 static int
1901 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1902 {
1903 #ifdef SG_ALLOW_DIO_CODE
1904 sg_io_hdr_t *hp = &srp->header;
1905 Sg_scatter_hold *schp = &srp->data;
1906 int sg_tablesize = sfp->parentdp->sg_tablesize;
1907 struct scatterlist *sgl;
1908 int mx_sc_elems, res;
1909 struct scsi_device *sdev = sfp->parentdp->device;
1910
1911 if (((unsigned long)hp->dxferp &
1912 queue_dma_alignment(sdev->request_queue)) != 0)
1913 return 1;
1914 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1915 if (mx_sc_elems <= 0) {
1916 return 1;
1917 }
1918 sgl = (struct scatterlist *)schp->buffer;
1919 res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len,
1920 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX);
1921 if (res <= 0)
1922 return 1;
1923 schp->k_use_sg = res;
1924 schp->dio_in_use = 1;
1925 hp->info |= SG_INFO_DIRECT_IO;
1926 return 0;
1927 #else
1928 return 1;
1929 #endif
1930 }
1931
1932 static int
1933 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1934 {
1935 int ret_sz;
1936 int blk_size = buff_size;
1937 unsigned char *p = NULL;
1938
1939 if ((blk_size < 0) || (!sfp))
1940 return -EFAULT;
1941 if (0 == blk_size)
1942 ++blk_size; /* don't know why */
1943 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1944 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1945 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1946 buff_size, blk_size));
1947 if (blk_size <= SG_SCATTER_SZ) {
1948 p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz);
1949 if (!p)
1950 return -ENOMEM;
1951 if (blk_size == ret_sz) { /* got it on the first attempt */
1952 schp->k_use_sg = 0;
1953 schp->buffer = p;
1954 schp->bufflen = blk_size;
1955 schp->b_malloc_len = blk_size;
1956 return 0;
1957 }
1958 } else {
1959 p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz);
1960 if (!p)
1961 return -ENOMEM;
1962 }
1963 /* Want some local declarations, so start new block ... */
1964 { /* lets try and build a scatter gather list */
1965 struct scatterlist *sclp;
1966 int k, rem_sz, num;
1967 int mx_sc_elems;
1968 int sg_tablesize = sfp->parentdp->sg_tablesize;
1969 int first = 1;
1970
1971 /* N.B. ret_sz carried into this block ... */
1972 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1973 if (mx_sc_elems < 0)
1974 return mx_sc_elems; /* most likely -ENOMEM */
1975
1976 for (k = 0, sclp = schp->buffer, rem_sz = blk_size;
1977 (rem_sz > 0) && (k < mx_sc_elems);
1978 ++k, rem_sz -= ret_sz, ++sclp) {
1979 if (first)
1980 first = 0;
1981 else {
1982 num =
1983 (rem_sz >
1984 SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1985 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1986 if (!p)
1987 break;
1988 }
1989 sg_set_buf(sclp, p, ret_sz);
1990
1991 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1992 k, sg_scatg2virt(sclp), ret_sz));
1993 } /* end of for loop */
1994 schp->k_use_sg = k;
1995 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1996 schp->bufflen = blk_size;
1997 if (rem_sz > 0) /* must have failed */
1998 return -ENOMEM;
1999 }
2000 return 0;
2001 }
2002
2003 static int
2004 sg_write_xfer(Sg_request * srp)
2005 {
2006 sg_io_hdr_t *hp = &srp->header;
2007 Sg_scatter_hold *schp = &srp->data;
2008 int num_xfer = 0;
2009 int j, k, onum, usglen, ksglen, res;
2010 int iovec_count = (int) hp->iovec_count;
2011 int dxfer_dir = hp->dxfer_direction;
2012 unsigned char *p;
2013 unsigned char __user *up;
2014 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2015
2016 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
2017 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2018 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
2019 if (schp->bufflen < num_xfer)
2020 num_xfer = schp->bufflen;
2021 }
2022 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2023 (new_interface
2024 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2025 return 0;
2026
2027 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2028 num_xfer, iovec_count, schp->k_use_sg));
2029 if (iovec_count) {
2030 onum = iovec_count;
2031 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2032 return -EFAULT;
2033 } else
2034 onum = 1;
2035
2036 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2037 for (j = 0, p = schp->buffer; j < onum; ++j) {
2038 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2039 if (res)
2040 return res;
2041 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2042 if (__copy_from_user(p, up, usglen))
2043 return -EFAULT;
2044 p += usglen;
2045 num_xfer -= usglen;
2046 if (num_xfer <= 0)
2047 return 0;
2048 }
2049 } else { /* kernel using scatter gather list */
2050 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2051
2052 ksglen = (int) sclp->length;
2053 p = sg_scatg2virt(sclp);
2054 for (j = 0, k = 0; j < onum; ++j) {
2055 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
2056 if (res)
2057 return res;
2058
2059 for (; p; ++sclp, ksglen = (int) sclp->length,
2060 p = sg_scatg2virt(sclp)) {
2061 if (usglen <= 0)
2062 break;
2063 if (ksglen > usglen) {
2064 if (usglen >= num_xfer) {
2065 if (__copy_from_user
2066 (p, up, num_xfer))
2067 return -EFAULT;
2068 return 0;
2069 }
2070 if (__copy_from_user(p, up, usglen))
2071 return -EFAULT;
2072 p += usglen;
2073 ksglen -= usglen;
2074 break;
2075 } else {
2076 if (ksglen >= num_xfer) {
2077 if (__copy_from_user
2078 (p, up, num_xfer))
2079 return -EFAULT;
2080 return 0;
2081 }
2082 if (__copy_from_user(p, up, ksglen))
2083 return -EFAULT;
2084 up += ksglen;
2085 usglen -= ksglen;
2086 }
2087 ++k;
2088 if (k >= schp->k_use_sg)
2089 return 0;
2090 }
2091 }
2092 }
2093 return 0;
2094 }
2095
2096 static int
2097 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
2098 int wr_xf, int *countp, unsigned char __user **up)
2099 {
2100 int num_xfer = (int) hp->dxfer_len;
2101 unsigned char __user *p = hp->dxferp;
2102 int count;
2103
2104 if (0 == sg_num) {
2105 if (wr_xf && ('\0' == hp->interface_id))
2106 count = (int) hp->flags; /* holds "old" input_size */
2107 else
2108 count = num_xfer;
2109 } else {
2110 sg_iovec_t iovec;
2111 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
2112 return -EFAULT;
2113 p = iovec.iov_base;
2114 count = (int) iovec.iov_len;
2115 }
2116 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
2117 return -EFAULT;
2118 if (up)
2119 *up = p;
2120 if (countp)
2121 *countp = count;
2122 return 0;
2123 }
2124
2125 static void
2126 sg_remove_scat(Sg_scatter_hold * schp)
2127 {
2128 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
2129 if (schp->buffer && (schp->sglist_len > 0)) {
2130 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2131
2132 if (schp->dio_in_use) {
2133 #ifdef SG_ALLOW_DIO_CODE
2134 st_unmap_user_pages(sclp, schp->k_use_sg, TRUE);
2135 #endif
2136 } else {
2137 int k;
2138
2139 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2140 ++k, ++sclp) {
2141 SCSI_LOG_TIMEOUT(5, printk(
2142 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2143 k, sg_scatg2virt(sclp), sclp->length));
2144 sg_page_free(sg_scatg2virt(sclp), sclp->length);
2145 sclp->page = NULL;
2146 sclp->offset = 0;
2147 sclp->length = 0;
2148 }
2149 }
2150 sg_page_free(schp->buffer, schp->sglist_len);
2151 } else if (schp->buffer)
2152 sg_page_free(schp->buffer, schp->b_malloc_len);
2153 memset(schp, 0, sizeof (*schp));
2154 }
2155
2156 static int
2157 sg_read_xfer(Sg_request * srp)
2158 {
2159 sg_io_hdr_t *hp = &srp->header;
2160 Sg_scatter_hold *schp = &srp->data;
2161 int num_xfer = 0;
2162 int j, k, onum, usglen, ksglen, res;
2163 int iovec_count = (int) hp->iovec_count;
2164 int dxfer_dir = hp->dxfer_direction;
2165 unsigned char *p;
2166 unsigned char __user *up;
2167 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2168
2169 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2170 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2171 num_xfer = hp->dxfer_len;
2172 if (schp->bufflen < num_xfer)
2173 num_xfer = schp->bufflen;
2174 }
2175 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2176 (new_interface
2177 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2178 return 0;
2179
2180 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2181 num_xfer, iovec_count, schp->k_use_sg));
2182 if (iovec_count) {
2183 onum = iovec_count;
2184 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2185 return -EFAULT;
2186 } else
2187 onum = 1;
2188
2189 if (0 == schp->k_use_sg) { /* kernel has single buffer */
2190 for (j = 0, p = schp->buffer; j < onum; ++j) {
2191 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2192 if (res)
2193 return res;
2194 usglen = (num_xfer > usglen) ? usglen : num_xfer;
2195 if (__copy_to_user(up, p, usglen))
2196 return -EFAULT;
2197 p += usglen;
2198 num_xfer -= usglen;
2199 if (num_xfer <= 0)
2200 return 0;
2201 }
2202 } else { /* kernel using scatter gather list */
2203 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2204
2205 ksglen = (int) sclp->length;
2206 p = sg_scatg2virt(sclp);
2207 for (j = 0, k = 0; j < onum; ++j) {
2208 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2209 if (res)
2210 return res;
2211
2212 for (; p; ++sclp, ksglen = (int) sclp->length,
2213 p = sg_scatg2virt(sclp)) {
2214 if (usglen <= 0)
2215 break;
2216 if (ksglen > usglen) {
2217 if (usglen >= num_xfer) {
2218 if (__copy_to_user
2219 (up, p, num_xfer))
2220 return -EFAULT;
2221 return 0;
2222 }
2223 if (__copy_to_user(up, p, usglen))
2224 return -EFAULT;
2225 p += usglen;
2226 ksglen -= usglen;
2227 break;
2228 } else {
2229 if (ksglen >= num_xfer) {
2230 if (__copy_to_user
2231 (up, p, num_xfer))
2232 return -EFAULT;
2233 return 0;
2234 }
2235 if (__copy_to_user(up, p, ksglen))
2236 return -EFAULT;
2237 up += ksglen;
2238 usglen -= ksglen;
2239 }
2240 ++k;
2241 if (k >= schp->k_use_sg)
2242 return 0;
2243 }
2244 }
2245 }
2246 return 0;
2247 }
2248
2249 static int
2250 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2251 {
2252 Sg_scatter_hold *schp = &srp->data;
2253
2254 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2255 num_read_xfer));
2256 if ((!outp) || (num_read_xfer <= 0))
2257 return 0;
2258 if (schp->k_use_sg > 0) {
2259 int k, num;
2260 struct scatterlist *sclp = (struct scatterlist *) schp->buffer;
2261
2262 for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp);
2263 ++k, ++sclp) {
2264 num = (int) sclp->length;
2265 if (num > num_read_xfer) {
2266 if (__copy_to_user
2267 (outp, sg_scatg2virt(sclp), num_read_xfer))
2268 return -EFAULT;
2269 break;
2270 } else {
2271 if (__copy_to_user
2272 (outp, sg_scatg2virt(sclp), num))
2273 return -EFAULT;
2274 num_read_xfer -= num;
2275 if (num_read_xfer <= 0)
2276 break;
2277 outp += num;
2278 }
2279 }
2280 } else {
2281 if (__copy_to_user(outp, schp->buffer, num_read_xfer))
2282 return -EFAULT;
2283 }
2284 return 0;
2285 }
2286
2287 static void
2288 sg_build_reserve(Sg_fd * sfp, int req_size)
2289 {
2290 Sg_scatter_hold *schp = &sfp->reserve;
2291
2292 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2293 do {
2294 if (req_size < PAGE_SIZE)
2295 req_size = PAGE_SIZE;
2296 if (0 == sg_build_indirect(schp, sfp, req_size))
2297 return;
2298 else
2299 sg_remove_scat(schp);
2300 req_size >>= 1; /* divide by 2 */
2301 } while (req_size > (PAGE_SIZE / 2));
2302 }
2303
2304 static void
2305 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2306 {
2307 Sg_scatter_hold *req_schp = &srp->data;
2308 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2309
2310 srp->res_used = 1;
2311 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2312 size = (size + 1) & (~1); /* round to even for aha1542 */
2313 if (rsv_schp->k_use_sg > 0) {
2314 int k, num;
2315 int rem = size;
2316 struct scatterlist *sclp =
2317 (struct scatterlist *) rsv_schp->buffer;
2318
2319 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) {
2320 num = (int) sclp->length;
2321 if (rem <= num) {
2322 if (0 == k) {
2323 req_schp->k_use_sg = 0;
2324 req_schp->buffer = sg_scatg2virt(sclp);
2325 } else {
2326 sfp->save_scat_len = num;
2327 sclp->length = (unsigned) rem;
2328 req_schp->k_use_sg = k + 1;
2329 req_schp->sglist_len =
2330 rsv_schp->sglist_len;
2331 req_schp->buffer = rsv_schp->buffer;
2332 }
2333 req_schp->bufflen = size;
2334 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2335 break;
2336 } else
2337 rem -= num;
2338 }
2339 if (k >= rsv_schp->k_use_sg)
2340 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2341 } else {
2342 req_schp->k_use_sg = 0;
2343 req_schp->bufflen = size;
2344 req_schp->buffer = rsv_schp->buffer;
2345 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2346 }
2347 }
2348
2349 static void
2350 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2351 {
2352 Sg_scatter_hold *req_schp = &srp->data;
2353 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2354
2355 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2356 (int) req_schp->k_use_sg));
2357 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2358 struct scatterlist *sclp =
2359 (struct scatterlist *) rsv_schp->buffer;
2360
2361 if (sfp->save_scat_len > 0)
2362 (sclp + (req_schp->k_use_sg - 1))->length =
2363 (unsigned) sfp->save_scat_len;
2364 else
2365 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2366 }
2367 req_schp->k_use_sg = 0;
2368 req_schp->bufflen = 0;
2369 req_schp->buffer = NULL;
2370 req_schp->sglist_len = 0;
2371 sfp->save_scat_len = 0;
2372 srp->res_used = 0;
2373 }
2374
2375 static Sg_request *
2376 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2377 {
2378 Sg_request *resp;
2379 unsigned long iflags;
2380
2381 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2382 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2383 /* look for requests that are ready + not SG_IO owned */
2384 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2385 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2386 resp->done = 2; /* guard against other readers */
2387 break;
2388 }
2389 }
2390 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2391 return resp;
2392 }
2393
2394 #ifdef CONFIG_SCSI_PROC_FS
2395 static Sg_request *
2396 sg_get_nth_request(Sg_fd * sfp, int nth)
2397 {
2398 Sg_request *resp;
2399 unsigned long iflags;
2400 int k;
2401
2402 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2403 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2404 ++k, resp = resp->nextrp) ;
2405 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2406 return resp;
2407 }
2408 #endif
2409
2410 /* always adds to end of list */
2411 static Sg_request *
2412 sg_add_request(Sg_fd * sfp)
2413 {
2414 int k;
2415 unsigned long iflags;
2416 Sg_request *resp;
2417 Sg_request *rp = sfp->req_arr;
2418
2419 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2420 resp = sfp->headrp;
2421 if (!resp) {
2422 memset(rp, 0, sizeof (Sg_request));
2423 rp->parentfp = sfp;
2424 resp = rp;
2425 sfp->headrp = resp;
2426 } else {
2427 if (0 == sfp->cmd_q)
2428 resp = NULL; /* command queuing disallowed */
2429 else {
2430 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2431 if (!rp->parentfp)
2432 break;
2433 }
2434 if (k < SG_MAX_QUEUE) {
2435 memset(rp, 0, sizeof (Sg_request));
2436 rp->parentfp = sfp;
2437 while (resp->nextrp)
2438 resp = resp->nextrp;
2439 resp->nextrp = rp;
2440 resp = rp;
2441 } else
2442 resp = NULL;
2443 }
2444 }
2445 if (resp) {
2446 resp->nextrp = NULL;
2447 resp->header.duration = jiffies_to_msecs(jiffies);
2448 resp->my_cmdp = NULL;
2449 }
2450 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2451 return resp;
2452 }
2453
2454 /* Return of 1 for found; 0 for not found */
2455 static int
2456 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2457 {
2458 Sg_request *prev_rp;
2459 Sg_request *rp;
2460 unsigned long iflags;
2461 int res = 0;
2462
2463 if ((!sfp) || (!srp) || (!sfp->headrp))
2464 return res;
2465 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2466 if (srp->my_cmdp)
2467 srp->my_cmdp->upper_private_data = NULL;
2468 prev_rp = sfp->headrp;
2469 if (srp == prev_rp) {
2470 sfp->headrp = prev_rp->nextrp;
2471 prev_rp->parentfp = NULL;
2472 res = 1;
2473 } else {
2474 while ((rp = prev_rp->nextrp)) {
2475 if (srp == rp) {
2476 prev_rp->nextrp = rp->nextrp;
2477 rp->parentfp = NULL;
2478 res = 1;
2479 break;
2480 }
2481 prev_rp = rp;
2482 }
2483 }
2484 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2485 return res;
2486 }
2487
2488 #ifdef CONFIG_SCSI_PROC_FS
2489 static Sg_fd *
2490 sg_get_nth_sfp(Sg_device * sdp, int nth)
2491 {
2492 Sg_fd *resp;
2493 unsigned long iflags;
2494 int k;
2495
2496 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2497 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2498 ++k, resp = resp->nextfp) ;
2499 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2500 return resp;
2501 }
2502 #endif
2503
2504 static Sg_fd *
2505 sg_add_sfp(Sg_device * sdp, int dev)
2506 {
2507 Sg_fd *sfp;
2508 unsigned long iflags;
2509
2510 sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL);
2511 if (!sfp)
2512 return NULL;
2513 memset(sfp, 0, sizeof (Sg_fd));
2514 init_waitqueue_head(&sfp->read_wait);
2515 rwlock_init(&sfp->rq_list_lock);
2516
2517 sfp->timeout = SG_DEFAULT_TIMEOUT;
2518 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2519 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2520 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2521 sdp->device->host->unchecked_isa_dma : 1;
2522 sfp->cmd_q = SG_DEF_COMMAND_Q;
2523 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2524 sfp->parentdp = sdp;
2525 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2526 if (!sdp->headfp)
2527 sdp->headfp = sfp;
2528 else { /* add to tail of existing list */
2529 Sg_fd *pfp = sdp->headfp;
2530 while (pfp->nextfp)
2531 pfp = pfp->nextfp;
2532 pfp->nextfp = sfp;
2533 }
2534 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2535 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2536 sg_build_reserve(sfp, sg_big_buff);
2537 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2538 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2539 return sfp;
2540 }
2541
2542 static void
2543 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2544 {
2545 Sg_fd *fp;
2546 Sg_fd *prev_fp;
2547
2548 prev_fp = sdp->headfp;
2549 if (sfp == prev_fp)
2550 sdp->headfp = prev_fp->nextfp;
2551 else {
2552 while ((fp = prev_fp->nextfp)) {
2553 if (sfp == fp) {
2554 prev_fp->nextfp = fp->nextfp;
2555 break;
2556 }
2557 prev_fp = fp;
2558 }
2559 }
2560 if (sfp->reserve.bufflen > 0) {
2561 SCSI_LOG_TIMEOUT(6,
2562 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2563 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2564 if (sfp->mmap_called)
2565 sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */
2566 sg_remove_scat(&sfp->reserve);
2567 }
2568 sfp->parentdp = NULL;
2569 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2570 sg_page_free((char *) sfp, sizeof (Sg_fd));
2571 }
2572
2573 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2574 static int
2575 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2576 {
2577 Sg_request *srp;
2578 Sg_request *tsrp;
2579 int dirty = 0;
2580 int res = 0;
2581
2582 for (srp = sfp->headrp; srp; srp = tsrp) {
2583 tsrp = srp->nextrp;
2584 if (sg_srp_done(srp, sfp))
2585 sg_finish_rem_req(srp);
2586 else
2587 ++dirty;
2588 }
2589 if (0 == dirty) {
2590 unsigned long iflags;
2591
2592 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2593 __sg_remove_sfp(sdp, sfp);
2594 if (sdp->detached && (NULL == sdp->headfp)) {
2595 int k, maxd;
2596
2597 maxd = sg_dev_max;
2598 for (k = 0; k < maxd; ++k) {
2599 if (sdp == sg_dev_arr[k])
2600 break;
2601 }
2602 if (k < maxd)
2603 sg_dev_arr[k] = NULL;
2604 kfree((char *) sdp);
2605 res = 1;
2606 }
2607 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2608 } else {
2609 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2610 /* only bump the access_count if we actually succeeded in
2611 * throwing another counter on the host module */
2612 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2613 sfp->closed = 1; /* flag dirty state on this fd */
2614 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2615 dirty));
2616 }
2617 return res;
2618 }
2619
2620 static int
2621 sg_res_in_use(Sg_fd * sfp)
2622 {
2623 const Sg_request *srp;
2624 unsigned long iflags;
2625
2626 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2627 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2628 if (srp->res_used)
2629 break;
2630 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2631 return srp ? 1 : 0;
2632 }
2633
2634 /* If retSzp==NULL want exact size or fail */
2635 static char *
2636 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2637 {
2638 char *resp = NULL;
2639 gfp_t page_mask;
2640 int order, a_size;
2641 int resSz = rqSz;
2642
2643 if (rqSz <= 0)
2644 return resp;
2645
2646 if (lowDma)
2647 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN;
2648 else
2649 page_mask = GFP_ATOMIC | __GFP_NOWARN;
2650
2651 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2652 order++, a_size <<= 1) ;
2653 resp = (char *) __get_free_pages(page_mask, order);
2654 while ((!resp) && order && retSzp) {
2655 --order;
2656 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2657 resp = (char *) __get_free_pages(page_mask, order); /* try half */
2658 resSz = a_size;
2659 }
2660 if (resp) {
2661 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2662 memset(resp, 0, resSz);
2663 if (retSzp)
2664 *retSzp = resSz;
2665 }
2666 return resp;
2667 }
2668
2669 static void
2670 sg_page_free(char *buff, int size)
2671 {
2672 int order, a_size;
2673
2674 if (!buff)
2675 return;
2676 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2677 order++, a_size <<= 1) ;
2678 free_pages((unsigned long) buff, order);
2679 }
2680
2681 #ifndef MAINTENANCE_IN_CMD
2682 #define MAINTENANCE_IN_CMD 0xa3
2683 #endif
2684
2685 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2686 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2687 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2688 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2689 };
2690
2691 static int
2692 sg_allow_access(unsigned char opcode, char dev_type)
2693 {
2694 int k;
2695
2696 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2697 return 1;
2698 for (k = 0; k < sizeof (allow_ops); ++k) {
2699 if (opcode == allow_ops[k])
2700 return 1;
2701 }
2702 return 0;
2703 }
2704
2705 #ifdef CONFIG_SCSI_PROC_FS
2706 static int
2707 sg_last_dev(void)
2708 {
2709 int k;
2710 unsigned long iflags;
2711
2712 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2713 for (k = sg_dev_max - 1; k >= 0; --k)
2714 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2715 break;
2716 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2717 return k + 1; /* origin 1 */
2718 }
2719 #endif
2720
2721 static Sg_device *
2722 sg_get_dev(int dev)
2723 {
2724 Sg_device *sdp = NULL;
2725 unsigned long iflags;
2726
2727 if (sg_dev_arr && (dev >= 0)) {
2728 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2729 if (dev < sg_dev_max)
2730 sdp = sg_dev_arr[dev];
2731 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2732 }
2733 return sdp;
2734 }
2735
2736 #ifdef CONFIG_SCSI_PROC_FS
2737
2738 static struct proc_dir_entry *sg_proc_sgp = NULL;
2739
2740 static char sg_proc_sg_dirname[] = "scsi/sg";
2741
2742 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2743
2744 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2745 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2746 size_t count, loff_t *off);
2747 static struct file_operations adio_fops = {
2748 /* .owner, .read and .llseek added in sg_proc_init() */
2749 .open = sg_proc_single_open_adio,
2750 .write = sg_proc_write_adio,
2751 .release = single_release,
2752 };
2753
2754 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2755 static ssize_t sg_proc_write_dressz(struct file *filp,
2756 const char __user *buffer, size_t count, loff_t *off);
2757 static struct file_operations dressz_fops = {
2758 .open = sg_proc_single_open_dressz,
2759 .write = sg_proc_write_dressz,
2760 .release = single_release,
2761 };
2762
2763 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2764 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2765 static struct file_operations version_fops = {
2766 .open = sg_proc_single_open_version,
2767 .release = single_release,
2768 };
2769
2770 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2771 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2772 static struct file_operations devhdr_fops = {
2773 .open = sg_proc_single_open_devhdr,
2774 .release = single_release,
2775 };
2776
2777 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2778 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2779 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2780 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2781 static void dev_seq_stop(struct seq_file *s, void *v);
2782 static struct file_operations dev_fops = {
2783 .open = sg_proc_open_dev,
2784 .release = seq_release,
2785 };
2786 static struct seq_operations dev_seq_ops = {
2787 .start = dev_seq_start,
2788 .next = dev_seq_next,
2789 .stop = dev_seq_stop,
2790 .show = sg_proc_seq_show_dev,
2791 };
2792
2793 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2794 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2795 static struct file_operations devstrs_fops = {
2796 .open = sg_proc_open_devstrs,
2797 .release = seq_release,
2798 };
2799 static struct seq_operations devstrs_seq_ops = {
2800 .start = dev_seq_start,
2801 .next = dev_seq_next,
2802 .stop = dev_seq_stop,
2803 .show = sg_proc_seq_show_devstrs,
2804 };
2805
2806 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2807 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2808 static struct file_operations debug_fops = {
2809 .open = sg_proc_open_debug,
2810 .release = seq_release,
2811 };
2812 static struct seq_operations debug_seq_ops = {
2813 .start = dev_seq_start,
2814 .next = dev_seq_next,
2815 .stop = dev_seq_stop,
2816 .show = sg_proc_seq_show_debug,
2817 };
2818
2819
2820 struct sg_proc_leaf {
2821 const char * name;
2822 struct file_operations * fops;
2823 };
2824
2825 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2826 {"allow_dio", &adio_fops},
2827 {"debug", &debug_fops},
2828 {"def_reserved_size", &dressz_fops},
2829 {"device_hdr", &devhdr_fops},
2830 {"devices", &dev_fops},
2831 {"device_strs", &devstrs_fops},
2832 {"version", &version_fops}
2833 };
2834
2835 static int
2836 sg_proc_init(void)
2837 {
2838 int k, mask;
2839 int num_leaves =
2840 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2841 struct proc_dir_entry *pdep;
2842 struct sg_proc_leaf * leaf;
2843
2844 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2845 if (!sg_proc_sgp)
2846 return 1;
2847 for (k = 0; k < num_leaves; ++k) {
2848 leaf = &sg_proc_leaf_arr[k];
2849 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2850 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2851 if (pdep) {
2852 leaf->fops->owner = THIS_MODULE,
2853 leaf->fops->read = seq_read,
2854 leaf->fops->llseek = seq_lseek,
2855 pdep->proc_fops = leaf->fops;
2856 }
2857 }
2858 return 0;
2859 }
2860
2861 static void
2862 sg_proc_cleanup(void)
2863 {
2864 int k;
2865 int num_leaves =
2866 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2867
2868 if (!sg_proc_sgp)
2869 return;
2870 for (k = 0; k < num_leaves; ++k)
2871 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2872 remove_proc_entry(sg_proc_sg_dirname, NULL);
2873 }
2874
2875
2876 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2877 {
2878 seq_printf(s, "%d\n", *((int *)s->private));
2879 return 0;
2880 }
2881
2882 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2883 {
2884 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2885 }
2886
2887 static ssize_t
2888 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2889 size_t count, loff_t *off)
2890 {
2891 int num;
2892 char buff[11];
2893
2894 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2895 return -EACCES;
2896 num = (count < 10) ? count : 10;
2897 if (copy_from_user(buff, buffer, num))
2898 return -EFAULT;
2899 buff[num] = '\0';
2900 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2901 return count;
2902 }
2903
2904 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2905 {
2906 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2907 }
2908
2909 static ssize_t
2910 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2911 size_t count, loff_t *off)
2912 {
2913 int num;
2914 unsigned long k = ULONG_MAX;
2915 char buff[11];
2916
2917 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2918 return -EACCES;
2919 num = (count < 10) ? count : 10;
2920 if (copy_from_user(buff, buffer, num))
2921 return -EFAULT;
2922 buff[num] = '\0';
2923 k = simple_strtoul(buff, NULL, 10);
2924 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2925 sg_big_buff = k;
2926 return count;
2927 }
2928 return -ERANGE;
2929 }
2930
2931 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2932 {
2933 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2934 sg_version_date);
2935 return 0;
2936 }
2937
2938 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2939 {
2940 return single_open(file, sg_proc_seq_show_version, NULL);
2941 }
2942
2943 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2944 {
2945 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2946 "online\n");
2947 return 0;
2948 }
2949
2950 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2951 {
2952 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2953 }
2954
2955 struct sg_proc_deviter {
2956 loff_t index;
2957 size_t max;
2958 };
2959
2960 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2961 {
2962 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2963
2964 s->private = it;
2965 if (! it)
2966 return NULL;
2967
2968 if (NULL == sg_dev_arr)
2969 return NULL;
2970 it->index = *pos;
2971 it->max = sg_last_dev();
2972 if (it->index >= it->max)
2973 return NULL;
2974 return it;
2975 }
2976
2977 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2978 {
2979 struct sg_proc_deviter * it = s->private;
2980
2981 *pos = ++it->index;
2982 return (it->index < it->max) ? it : NULL;
2983 }
2984
2985 static void dev_seq_stop(struct seq_file *s, void *v)
2986 {
2987 kfree(s->private);
2988 }
2989
2990 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2991 {
2992 return seq_open(file, &dev_seq_ops);
2993 }
2994
2995 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2996 {
2997 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2998 Sg_device *sdp;
2999 struct scsi_device *scsidp;
3000
3001 sdp = it ? sg_get_dev(it->index) : NULL;
3002 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
3003 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
3004 scsidp->host->host_no, scsidp->channel,
3005 scsidp->id, scsidp->lun, (int) scsidp->type,
3006 1,
3007 (int) scsidp->queue_depth,
3008 (int) scsidp->device_busy,
3009 (int) scsi_device_online(scsidp));
3010 else
3011 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
3012 return 0;
3013 }
3014
3015 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
3016 {
3017 return seq_open(file, &devstrs_seq_ops);
3018 }
3019
3020 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
3021 {
3022 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3023 Sg_device *sdp;
3024 struct scsi_device *scsidp;
3025
3026 sdp = it ? sg_get_dev(it->index) : NULL;
3027 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
3028 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
3029 scsidp->vendor, scsidp->model, scsidp->rev);
3030 else
3031 seq_printf(s, "<no active device>\n");
3032 return 0;
3033 }
3034
3035 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
3036 {
3037 int k, m, new_interface, blen, usg;
3038 Sg_request *srp;
3039 Sg_fd *fp;
3040 const sg_io_hdr_t *hp;
3041 const char * cp;
3042 unsigned int ms;
3043
3044 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
3045 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
3046 "(res)sgat=%d low_dma=%d\n", k + 1,
3047 jiffies_to_msecs(fp->timeout),
3048 fp->reserve.bufflen,
3049 (int) fp->reserve.k_use_sg,
3050 (int) fp->low_dma);
3051 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
3052 (int) fp->cmd_q, (int) fp->force_packid,
3053 (int) fp->keep_orphan, (int) fp->closed);
3054 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
3055 hp = &srp->header;
3056 new_interface = (hp->interface_id == '\0') ? 0 : 1;
3057 if (srp->res_used) {
3058 if (new_interface &&
3059 (SG_FLAG_MMAP_IO & hp->flags))
3060 cp = " mmap>> ";
3061 else
3062 cp = " rb>> ";
3063 } else {
3064 if (SG_INFO_DIRECT_IO_MASK & hp->info)
3065 cp = " dio>> ";
3066 else
3067 cp = " ";
3068 }
3069 seq_printf(s, cp);
3070 blen = srp->my_cmdp ?
3071 srp->my_cmdp->sr_bufflen : srp->data.bufflen;
3072 usg = srp->my_cmdp ?
3073 srp->my_cmdp->sr_use_sg : srp->data.k_use_sg;
3074 seq_printf(s, srp->done ?
3075 ((1 == srp->done) ? "rcv:" : "fin:")
3076 : (srp->my_cmdp ? "act:" : "prior:"));
3077 seq_printf(s, " id=%d blen=%d",
3078 srp->header.pack_id, blen);
3079 if (srp->done)
3080 seq_printf(s, " dur=%d", hp->duration);
3081 else {
3082 ms = jiffies_to_msecs(jiffies);
3083 seq_printf(s, " t_o/elap=%d/%d",
3084 (new_interface ? hp->timeout :
3085 jiffies_to_msecs(fp->timeout)),
3086 (ms > hp->duration ? ms - hp->duration : 0));
3087 }
3088 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
3089 (int) srp->data.cmd_opcode);
3090 }
3091 if (0 == m)
3092 seq_printf(s, " No requests active\n");
3093 }
3094 }
3095
3096 static int sg_proc_open_debug(struct inode *inode, struct file *file)
3097 {
3098 return seq_open(file, &debug_seq_ops);
3099 }
3100
3101 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
3102 {
3103 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
3104 Sg_device *sdp;
3105
3106 if (it && (0 == it->index)) {
3107 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
3108 "(origin 1)\n", sg_dev_max, (int)it->max);
3109 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
3110 }
3111 sdp = it ? sg_get_dev(it->index) : NULL;
3112 if (sdp) {
3113 struct scsi_device *scsidp = sdp->device;
3114
3115 if (NULL == scsidp) {
3116 seq_printf(s, "device %d detached ??\n",
3117 (int)it->index);
3118 return 0;
3119 }
3120
3121 if (sg_get_nth_sfp(sdp, 0)) {
3122 seq_printf(s, " >>> device=%s ",
3123 sdp->disk->disk_name);
3124 if (sdp->detached)
3125 seq_printf(s, "detached pending close ");
3126 else
3127 seq_printf
3128 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
3129 scsidp->host->host_no,
3130 scsidp->channel, scsidp->id,
3131 scsidp->lun,
3132 scsidp->host->hostt->emulated);
3133 seq_printf(s, " sg_tablesize=%d excl=%d\n",
3134 sdp->sg_tablesize, sdp->exclude);
3135 }
3136 sg_proc_debug_helper(s, sdp);
3137 }
3138 return 0;
3139 }
3140
3141 #endif /* CONFIG_SCSI_PROC_FS */
3142
3143 module_init(init_sg);
3144 module_exit(exit_sg);
3145 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
Support for the Chinese Samsung S3C2440 based development boards