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[PATCH] radix-tree documentation cleanups
[linux-2.6/mini2440.git] / drivers / scsi / sg.c
blob7405d0df95dbc3317eafde865dbdb2937e96b47a
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/cdev.h>
48 #include <linux/seq_file.h>
49 #include <linux/blkdev.h>
50 #include <linux/delay.h>
51 #include <linux/scatterlist.h>
52
53 #include "scsi.h"
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_host.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_ioctl.h>
58 #include <scsi/sg.h>
59
60 #include "scsi_logging.h"
61
62 #ifdef CONFIG_SCSI_PROC_FS
63 #include <linux/proc_fs.h>
64 static char *sg_version_date = "20050908";
65
66 static int sg_proc_init(void);
67 static void sg_proc_cleanup(void);
68 #endif
69
70 #define SG_ALLOW_DIO_DEF 0
71 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
72
73 #define SG_MAX_DEVS 32768
74
75 /*
76 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
77 * Then when using 32 bit integers x * m may overflow during the calculation.
78 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
79 * calculates the same, but prevents the overflow when both m and d
80 * are "small" numbers (like HZ and USER_HZ).
81 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
82 * in 32 bits.
83 */
84 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
85
86 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
87
88 int sg_big_buff = SG_DEF_RESERVED_SIZE;
89 /* N.B. This variable is readable and writeable via
90 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
91 of this size (or less if there is not enough memory) will be reserved
92 for use by this file descriptor. [Deprecated usage: this variable is also
93 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
94 the kernel (i.e. it is not a module).] */
95 static int def_reserved_size = -1; /* picks up init parameter */
96 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
97
98 #define SG_SECTOR_SZ 512
99 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
100
101 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
102
103 static int sg_add(struct class_device *, struct class_interface *);
104 static void sg_remove(struct class_device *, struct class_interface *);
105
106 static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
107 file descriptor list for device */
108
109 static struct class_interface sg_interface = {
110 .add = sg_add,
111 .remove = sg_remove,
112 };
113
114 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
115 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
116 unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
117 unsigned bufflen; /* Size of (aggregate) data buffer */
118 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
119 struct scatterlist *buffer;/* scatter list */
120 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
121 unsigned char cmd_opcode; /* first byte of command */
122 } Sg_scatter_hold;
123
124 struct sg_device; /* forward declarations */
125 struct sg_fd;
126
127 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
128 struct sg_request *nextrp; /* NULL -> tail request (slist) */
129 struct sg_fd *parentfp; /* NULL -> not in use */
130 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
131 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
132 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
133 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
134 char orphan; /* 1 -> drop on sight, 0 -> normal */
135 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
136 volatile char done; /* 0->before bh, 1->before read, 2->read */
137 } Sg_request;
138
139 typedef struct sg_fd { /* holds the state of a file descriptor */
140 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
141 struct sg_device *parentdp; /* owning device */
142 wait_queue_head_t read_wait; /* queue read until command done */
143 rwlock_t rq_list_lock; /* protect access to list in req_arr */
144 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
145 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
146 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
147 unsigned save_scat_len; /* original length of trunc. scat. element */
148 Sg_request *headrp; /* head of request slist, NULL->empty */
149 struct fasync_struct *async_qp; /* used by asynchronous notification */
150 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
151 char low_dma; /* as in parent but possibly overridden to 1 */
152 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
153 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
154 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
155 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
156 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
157 char mmap_called; /* 0 -> mmap() never called on this fd */
158 } Sg_fd;
159
160 typedef struct sg_device { /* holds the state of each scsi generic device */
161 struct scsi_device *device;
162 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
163 int sg_tablesize; /* adapter's max scatter-gather table size */
164 Sg_fd *headfp; /* first open fd belonging to this device */
165 volatile char detached; /* 0->attached, 1->detached pending removal */
166 volatile char exclude; /* opened for exclusive access */
167 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
168 struct gendisk *disk;
169 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
170 } Sg_device;
171
172 static int sg_fasync(int fd, struct file *filp, int mode);
173 /* tasklet or soft irq callback */
174 static void sg_cmd_done(void *data, char *sense, int result, int resid);
175 static int sg_start_req(Sg_request * srp);
176 static void sg_finish_rem_req(Sg_request * srp);
177 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
178 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
179 int tablesize);
180 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
181 Sg_request * srp);
182 static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
183 int blocking, int read_only, Sg_request ** o_srp);
184 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
185 unsigned char *cmnd, int timeout, int blocking);
186 static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
187 int wr_xf, int *countp, unsigned char __user **up);
188 static int sg_write_xfer(Sg_request * srp);
189 static int sg_read_xfer(Sg_request * srp);
190 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
191 static void sg_remove_scat(Sg_scatter_hold * schp);
192 static void sg_build_reserve(Sg_fd * sfp, int req_size);
193 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
194 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
195 static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
196 static void sg_page_free(struct page *page, int size);
197 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
198 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
199 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
200 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
201 static Sg_request *sg_add_request(Sg_fd * sfp);
202 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
203 static int sg_res_in_use(Sg_fd * sfp);
204 static int sg_allow_access(unsigned char opcode, char dev_type);
205 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
206 static Sg_device *sg_get_dev(int dev);
207 #ifdef CONFIG_SCSI_PROC_FS
208 static int sg_last_dev(void);
209 #endif
210
211 static Sg_device **sg_dev_arr = NULL;
212 static int sg_dev_max;
213 static int sg_nr_dev;
214
215 #define SZ_SG_HEADER sizeof(struct sg_header)
216 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
217 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
218 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
219
220 static int
221 sg_open(struct inode *inode, struct file *filp)
222 {
223 int dev = iminor(inode);
224 int flags = filp->f_flags;
225 struct request_queue *q;
226 Sg_device *sdp;
227 Sg_fd *sfp;
228 int res;
229 int retval;
230
231 nonseekable_open(inode, filp);
232 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
233 sdp = sg_get_dev(dev);
234 if ((!sdp) || (!sdp->device))
235 return -ENXIO;
236 if (sdp->detached)
237 return -ENODEV;
238
239 /* This driver's module count bumped by fops_get in <linux/fs.h> */
240 /* Prevent the device driver from vanishing while we sleep */
241 retval = scsi_device_get(sdp->device);
242 if (retval)
243 return retval;
244
245 if (!((flags & O_NONBLOCK) ||
246 scsi_block_when_processing_errors(sdp->device))) {
247 retval = -ENXIO;
248 /* we are in error recovery for this device */
249 goto error_out;
250 }
251
252 if (flags & O_EXCL) {
253 if (O_RDONLY == (flags & O_ACCMODE)) {
254 retval = -EPERM; /* Can't lock it with read only access */
255 goto error_out;
256 }
257 if (sdp->headfp && (flags & O_NONBLOCK)) {
258 retval = -EBUSY;
259 goto error_out;
260 }
261 res = 0;
262 __wait_event_interruptible(sdp->o_excl_wait,
263 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
264 if (res) {
265 retval = res; /* -ERESTARTSYS because signal hit process */
266 goto error_out;
267 }
268 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
269 if (flags & O_NONBLOCK) {
270 retval = -EBUSY;
271 goto error_out;
272 }
273 res = 0;
274 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
275 res);
276 if (res) {
277 retval = res; /* -ERESTARTSYS because signal hit process */
278 goto error_out;
279 }
280 }
281 if (sdp->detached) {
282 retval = -ENODEV;
283 goto error_out;
284 }
285 if (!sdp->headfp) { /* no existing opens on this device */
286 sdp->sgdebug = 0;
287 q = sdp->device->request_queue;
288 sdp->sg_tablesize = min(q->max_hw_segments,
289 q->max_phys_segments);
290 }
291 if ((sfp = sg_add_sfp(sdp, dev)))
292 filp->private_data = sfp;
293 else {
294 if (flags & O_EXCL)
295 sdp->exclude = 0; /* undo if error */
296 retval = -ENOMEM;
297 goto error_out;
298 }
299 return 0;
300
301 error_out:
302 scsi_device_put(sdp->device);
303 return retval;
304 }
305
306 /* Following function was formerly called 'sg_close' */
307 static int
308 sg_release(struct inode *inode, struct file *filp)
309 {
310 Sg_device *sdp;
311 Sg_fd *sfp;
312
313 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
314 return -ENXIO;
315 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
316 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
317 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
318 if (!sdp->detached) {
319 scsi_device_put(sdp->device);
320 }
321 sdp->exclude = 0;
322 wake_up_interruptible(&sdp->o_excl_wait);
323 }
324 return 0;
325 }
326
327 static ssize_t
328 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
329 {
330 Sg_device *sdp;
331 Sg_fd *sfp;
332 Sg_request *srp;
333 int req_pack_id = -1;
334 sg_io_hdr_t *hp;
335 struct sg_header *old_hdr = NULL;
336 int retval = 0;
337
338 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
339 return -ENXIO;
340 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
341 sdp->disk->disk_name, (int) count));
342
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 = SCSI_SENSE_BUFFERSIZE;
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[MAX_COMMAND_SIZE];
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[MAX_COMMAND_SIZE];
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, data_dir;
696 Sg_device *sdp = sfp->parentdp;
697 sg_io_hdr_t *hp = &srp->header;
698
699 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
700 hp->status = 0;
701 hp->masked_status = 0;
702 hp->msg_status = 0;
703 hp->info = 0;
704 hp->host_status = 0;
705 hp->driver_status = 0;
706 hp->resid = 0;
707 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
708 (int) cmnd[0], (int) hp->cmd_len));
709
710 if ((k = sg_start_req(srp))) {
711 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k));
712 sg_finish_rem_req(srp);
713 return k; /* probably out of space --> ENOMEM */
714 }
715 if ((k = sg_write_xfer(srp))) {
716 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
717 sg_finish_rem_req(srp);
718 return k;
719 }
720 if (sdp->detached) {
721 sg_finish_rem_req(srp);
722 return -ENODEV;
723 }
724
725 switch (hp->dxfer_direction) {
726 case SG_DXFER_TO_FROM_DEV:
727 case SG_DXFER_FROM_DEV:
728 data_dir = DMA_FROM_DEVICE;
729 break;
730 case SG_DXFER_TO_DEV:
731 data_dir = DMA_TO_DEVICE;
732 break;
733 case SG_DXFER_UNKNOWN:
734 data_dir = DMA_BIDIRECTIONAL;
735 break;
736 default:
737 data_dir = DMA_NONE;
738 break;
739 }
740 hp->duration = jiffies_to_msecs(jiffies);
741 /* Now send everything of to mid-level. The next time we hear about this
742 packet is when sg_cmd_done() is called (i.e. a callback). */
743 if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
744 hp->dxfer_len, srp->data.k_use_sg, timeout,
745 SG_DEFAULT_RETRIES, srp, sg_cmd_done,
746 GFP_ATOMIC)) {
747 SCSI_LOG_TIMEOUT(1, printk("sg_write: scsi_execute_async failed\n"));
748 /*
749 * most likely out of mem, but could also be a bad map
750 */
751 return -ENOMEM;
752 } else
753 return 0;
754 }
755
756 static int
757 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
758 {
759 unsigned long iflags;
760 int done;
761
762 read_lock_irqsave(&sfp->rq_list_lock, iflags);
763 done = srp->done;
764 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
765 return done;
766 }
767
768 static int
769 sg_ioctl(struct inode *inode, struct file *filp,
770 unsigned int cmd_in, unsigned long arg)
771 {
772 void __user *p = (void __user *)arg;
773 int __user *ip = p;
774 int result, val, read_only;
775 Sg_device *sdp;
776 Sg_fd *sfp;
777 Sg_request *srp;
778 unsigned long iflags;
779
780 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
781 return -ENXIO;
782 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
783 sdp->disk->disk_name, (int) cmd_in));
784 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
785
786 switch (cmd_in) {
787 case SG_IO:
788 {
789 int blocking = 1; /* ignore O_NONBLOCK flag */
790
791 if (sdp->detached)
792 return -ENODEV;
793 if (!scsi_block_when_processing_errors(sdp->device))
794 return -ENXIO;
795 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
796 return -EFAULT;
797 result =
798 sg_new_write(sfp, p, SZ_SG_IO_HDR,
799 blocking, read_only, &srp);
800 if (result < 0)
801 return result;
802 srp->sg_io_owned = 1;
803 while (1) {
804 result = 0; /* following macro to beat race condition */
805 __wait_event_interruptible(sfp->read_wait,
806 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
807 result);
808 if (sdp->detached)
809 return -ENODEV;
810 if (sfp->closed)
811 return 0; /* request packet dropped already */
812 if (0 == result)
813 break;
814 srp->orphan = 1;
815 return result; /* -ERESTARTSYS because signal hit process */
816 }
817 write_lock_irqsave(&sfp->rq_list_lock, iflags);
818 srp->done = 2;
819 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
820 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
821 return (result < 0) ? result : 0;
822 }
823 case SG_SET_TIMEOUT:
824 result = get_user(val, ip);
825 if (result)
826 return result;
827 if (val < 0)
828 return -EIO;
829 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
830 val = MULDIV (INT_MAX, USER_HZ, HZ);
831 sfp->timeout_user = val;
832 sfp->timeout = MULDIV (val, HZ, USER_HZ);
833
834 return 0;
835 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
836 /* strange ..., for backward compatibility */
837 return sfp->timeout_user;
838 case SG_SET_FORCE_LOW_DMA:
839 result = get_user(val, ip);
840 if (result)
841 return result;
842 if (val) {
843 sfp->low_dma = 1;
844 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
845 val = (int) sfp->reserve.bufflen;
846 sg_remove_scat(&sfp->reserve);
847 sg_build_reserve(sfp, val);
848 }
849 } else {
850 if (sdp->detached)
851 return -ENODEV;
852 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
853 }
854 return 0;
855 case SG_GET_LOW_DMA:
856 return put_user((int) sfp->low_dma, ip);
857 case SG_GET_SCSI_ID:
858 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
859 return -EFAULT;
860 else {
861 sg_scsi_id_t __user *sg_idp = p;
862
863 if (sdp->detached)
864 return -ENODEV;
865 __put_user((int) sdp->device->host->host_no,
866 &sg_idp->host_no);
867 __put_user((int) sdp->device->channel,
868 &sg_idp->channel);
869 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
870 __put_user((int) sdp->device->lun, &sg_idp->lun);
871 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
872 __put_user((short) sdp->device->host->cmd_per_lun,
873 &sg_idp->h_cmd_per_lun);
874 __put_user((short) sdp->device->queue_depth,
875 &sg_idp->d_queue_depth);
876 __put_user(0, &sg_idp->unused[0]);
877 __put_user(0, &sg_idp->unused[1]);
878 return 0;
879 }
880 case SG_SET_FORCE_PACK_ID:
881 result = get_user(val, ip);
882 if (result)
883 return result;
884 sfp->force_packid = val ? 1 : 0;
885 return 0;
886 case SG_GET_PACK_ID:
887 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
888 return -EFAULT;
889 read_lock_irqsave(&sfp->rq_list_lock, iflags);
890 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
891 if ((1 == srp->done) && (!srp->sg_io_owned)) {
892 read_unlock_irqrestore(&sfp->rq_list_lock,
893 iflags);
894 __put_user(srp->header.pack_id, ip);
895 return 0;
896 }
897 }
898 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
899 __put_user(-1, ip);
900 return 0;
901 case SG_GET_NUM_WAITING:
902 read_lock_irqsave(&sfp->rq_list_lock, iflags);
903 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
904 if ((1 == srp->done) && (!srp->sg_io_owned))
905 ++val;
906 }
907 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
908 return put_user(val, ip);
909 case SG_GET_SG_TABLESIZE:
910 return put_user(sdp->sg_tablesize, ip);
911 case SG_SET_RESERVED_SIZE:
912 result = get_user(val, ip);
913 if (result)
914 return result;
915 if (val < 0)
916 return -EINVAL;
917 if (val != sfp->reserve.bufflen) {
918 if (sg_res_in_use(sfp) || sfp->mmap_called)
919 return -EBUSY;
920 sg_remove_scat(&sfp->reserve);
921 sg_build_reserve(sfp, val);
922 }
923 return 0;
924 case SG_GET_RESERVED_SIZE:
925 val = (int) sfp->reserve.bufflen;
926 return put_user(val, ip);
927 case SG_SET_COMMAND_Q:
928 result = get_user(val, ip);
929 if (result)
930 return result;
931 sfp->cmd_q = val ? 1 : 0;
932 return 0;
933 case SG_GET_COMMAND_Q:
934 return put_user((int) sfp->cmd_q, ip);
935 case SG_SET_KEEP_ORPHAN:
936 result = get_user(val, ip);
937 if (result)
938 return result;
939 sfp->keep_orphan = val;
940 return 0;
941 case SG_GET_KEEP_ORPHAN:
942 return put_user((int) sfp->keep_orphan, ip);
943 case SG_NEXT_CMD_LEN:
944 result = get_user(val, ip);
945 if (result)
946 return result;
947 sfp->next_cmd_len = (val > 0) ? val : 0;
948 return 0;
949 case SG_GET_VERSION_NUM:
950 return put_user(sg_version_num, ip);
951 case SG_GET_ACCESS_COUNT:
952 /* faked - we don't have a real access count anymore */
953 val = (sdp->device ? 1 : 0);
954 return put_user(val, ip);
955 case SG_GET_REQUEST_TABLE:
956 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
957 return -EFAULT;
958 else {
959 sg_req_info_t *rinfo;
960 unsigned int ms;
961
962 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
963 GFP_KERNEL);
964 if (!rinfo)
965 return -ENOMEM;
966 read_lock_irqsave(&sfp->rq_list_lock, iflags);
967 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
968 ++val, srp = srp ? srp->nextrp : srp) {
969 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
970 if (srp) {
971 rinfo[val].req_state = srp->done + 1;
972 rinfo[val].problem =
973 srp->header.masked_status &
974 srp->header.host_status &
975 srp->header.driver_status;
976 if (srp->done)
977 rinfo[val].duration =
978 srp->header.duration;
979 else {
980 ms = jiffies_to_msecs(jiffies);
981 rinfo[val].duration =
982 (ms > srp->header.duration) ?
983 (ms - srp->header.duration) : 0;
984 }
985 rinfo[val].orphan = srp->orphan;
986 rinfo[val].sg_io_owned =
987 srp->sg_io_owned;
988 rinfo[val].pack_id =
989 srp->header.pack_id;
990 rinfo[val].usr_ptr =
991 srp->header.usr_ptr;
992 }
993 }
994 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
995 result = __copy_to_user(p, rinfo,
996 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
997 result = result ? -EFAULT : 0;
998 kfree(rinfo);
999 return result;
1000 }
1001 case SG_EMULATED_HOST:
1002 if (sdp->detached)
1003 return -ENODEV;
1004 return put_user(sdp->device->host->hostt->emulated, ip);
1005 case SG_SCSI_RESET:
1006 if (sdp->detached)
1007 return -ENODEV;
1008 if (filp->f_flags & O_NONBLOCK) {
1009 if (scsi_host_in_recovery(sdp->device->host))
1010 return -EBUSY;
1011 } else if (!scsi_block_when_processing_errors(sdp->device))
1012 return -EBUSY;
1013 result = get_user(val, ip);
1014 if (result)
1015 return result;
1016 if (SG_SCSI_RESET_NOTHING == val)
1017 return 0;
1018 switch (val) {
1019 case SG_SCSI_RESET_DEVICE:
1020 val = SCSI_TRY_RESET_DEVICE;
1021 break;
1022 case SG_SCSI_RESET_BUS:
1023 val = SCSI_TRY_RESET_BUS;
1024 break;
1025 case SG_SCSI_RESET_HOST:
1026 val = SCSI_TRY_RESET_HOST;
1027 break;
1028 default:
1029 return -EINVAL;
1030 }
1031 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1032 return -EACCES;
1033 return (scsi_reset_provider(sdp->device, val) ==
1034 SUCCESS) ? 0 : -EIO;
1035 case SCSI_IOCTL_SEND_COMMAND:
1036 if (sdp->detached)
1037 return -ENODEV;
1038 if (read_only) {
1039 unsigned char opcode = WRITE_6;
1040 Scsi_Ioctl_Command __user *siocp = p;
1041
1042 if (copy_from_user(&opcode, siocp->data, 1))
1043 return -EFAULT;
1044 if (!sg_allow_access(opcode, sdp->device->type))
1045 return -EPERM;
1046 }
1047 return scsi_ioctl_send_command(sdp->device, p);
1048 case SG_SET_DEBUG:
1049 result = get_user(val, ip);
1050 if (result)
1051 return result;
1052 sdp->sgdebug = (char) val;
1053 return 0;
1054 case SCSI_IOCTL_GET_IDLUN:
1055 case SCSI_IOCTL_GET_BUS_NUMBER:
1056 case SCSI_IOCTL_PROBE_HOST:
1057 case SG_GET_TRANSFORM:
1058 if (sdp->detached)
1059 return -ENODEV;
1060 return scsi_ioctl(sdp->device, cmd_in, p);
1061 default:
1062 if (read_only)
1063 return -EPERM; /* don't know so take safe approach */
1064 return scsi_ioctl(sdp->device, cmd_in, p);
1065 }
1066 }
1067
1068 #ifdef CONFIG_COMPAT
1069 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1070 {
1071 Sg_device *sdp;
1072 Sg_fd *sfp;
1073 struct scsi_device *sdev;
1074
1075 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1076 return -ENXIO;
1077
1078 sdev = sdp->device;
1079 if (sdev->host->hostt->compat_ioctl) {
1080 int ret;
1081
1082 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1083
1084 return ret;
1085 }
1086
1087 return -ENOIOCTLCMD;
1088 }
1089 #endif
1090
1091 static unsigned int
1092 sg_poll(struct file *filp, poll_table * wait)
1093 {
1094 unsigned int res = 0;
1095 Sg_device *sdp;
1096 Sg_fd *sfp;
1097 Sg_request *srp;
1098 int count = 0;
1099 unsigned long iflags;
1100
1101 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1102 || sfp->closed)
1103 return POLLERR;
1104 poll_wait(filp, &sfp->read_wait, wait);
1105 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1106 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1107 /* if any read waiting, flag it */
1108 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1109 res = POLLIN | POLLRDNORM;
1110 ++count;
1111 }
1112 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1113
1114 if (sdp->detached)
1115 res |= POLLHUP;
1116 else if (!sfp->cmd_q) {
1117 if (0 == count)
1118 res |= POLLOUT | POLLWRNORM;
1119 } else if (count < SG_MAX_QUEUE)
1120 res |= POLLOUT | POLLWRNORM;
1121 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1122 sdp->disk->disk_name, (int) res));
1123 return res;
1124 }
1125
1126 static int
1127 sg_fasync(int fd, struct file *filp, int mode)
1128 {
1129 int retval;
1130 Sg_device *sdp;
1131 Sg_fd *sfp;
1132
1133 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1134 return -ENXIO;
1135 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1136 sdp->disk->disk_name, mode));
1137
1138 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1139 return (retval < 0) ? retval : 0;
1140 }
1141
1142 static struct page *
1143 sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
1144 {
1145 Sg_fd *sfp;
1146 struct page *page = NOPAGE_SIGBUS;
1147 unsigned long offset, len, sa;
1148 Sg_scatter_hold *rsv_schp;
1149 struct scatterlist *sg;
1150 int k;
1151
1152 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1153 return page;
1154 rsv_schp = &sfp->reserve;
1155 offset = addr - vma->vm_start;
1156 if (offset >= rsv_schp->bufflen)
1157 return page;
1158 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1159 offset, rsv_schp->k_use_sg));
1160 sg = rsv_schp->buffer;
1161 sa = vma->vm_start;
1162 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1163 ++k, ++sg) {
1164 len = vma->vm_end - sa;
1165 len = (len < sg->length) ? len : sg->length;
1166 if (offset < len) {
1167 page = sg->page;
1168 get_page(page); /* increment page count */
1169 break;
1170 }
1171 sa += len;
1172 offset -= len;
1173 }
1174
1175 if (type)
1176 *type = VM_FAULT_MINOR;
1177 return page;
1178 }
1179
1180 static struct vm_operations_struct sg_mmap_vm_ops = {
1181 .nopage = sg_vma_nopage,
1182 };
1183
1184 static int
1185 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1186 {
1187 Sg_fd *sfp;
1188 unsigned long req_sz, len, sa;
1189 Sg_scatter_hold *rsv_schp;
1190 int k;
1191 struct scatterlist *sg;
1192
1193 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1194 return -ENXIO;
1195 req_sz = vma->vm_end - vma->vm_start;
1196 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1197 (void *) vma->vm_start, (int) req_sz));
1198 if (vma->vm_pgoff)
1199 return -EINVAL; /* want no offset */
1200 rsv_schp = &sfp->reserve;
1201 if (req_sz > rsv_schp->bufflen)
1202 return -ENOMEM; /* cannot map more than reserved buffer */
1203
1204 sa = vma->vm_start;
1205 sg = rsv_schp->buffer;
1206 for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
1207 ++k, ++sg) {
1208 len = vma->vm_end - sa;
1209 len = (len < sg->length) ? len : sg->length;
1210 sa += len;
1211 }
1212
1213 sfp->mmap_called = 1;
1214 vma->vm_flags |= VM_RESERVED;
1215 vma->vm_private_data = sfp;
1216 vma->vm_ops = &sg_mmap_vm_ops;
1217 return 0;
1218 }
1219
1220 /* This function is a "bottom half" handler that is called by the
1221 * mid level when a command is completed (or has failed). */
1222 static void
1223 sg_cmd_done(void *data, char *sense, int result, int resid)
1224 {
1225 Sg_request *srp = data;
1226 Sg_device *sdp = NULL;
1227 Sg_fd *sfp;
1228 unsigned long iflags;
1229 unsigned int ms;
1230
1231 if (NULL == srp) {
1232 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1233 return;
1234 }
1235 sfp = srp->parentfp;
1236 if (sfp)
1237 sdp = sfp->parentdp;
1238 if ((NULL == sdp) || sdp->detached) {
1239 printk(KERN_INFO "sg_cmd_done: device detached\n");
1240 return;
1241 }
1242
1243
1244 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1245 sdp->disk->disk_name, srp->header.pack_id, result));
1246 srp->header.resid = resid;
1247 ms = jiffies_to_msecs(jiffies);
1248 srp->header.duration = (ms > srp->header.duration) ?
1249 (ms - srp->header.duration) : 0;
1250 if (0 != result) {
1251 struct scsi_sense_hdr sshdr;
1252
1253 memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
1254 srp->header.status = 0xff & result;
1255 srp->header.masked_status = status_byte(result);
1256 srp->header.msg_status = msg_byte(result);
1257 srp->header.host_status = host_byte(result);
1258 srp->header.driver_status = driver_byte(result);
1259 if ((sdp->sgdebug > 0) &&
1260 ((CHECK_CONDITION == srp->header.masked_status) ||
1261 (COMMAND_TERMINATED == srp->header.masked_status)))
1262 __scsi_print_sense("sg_cmd_done", sense,
1263 SCSI_SENSE_BUFFERSIZE);
1264
1265 /* Following if statement is a patch supplied by Eric Youngdale */
1266 if (driver_byte(result) != 0
1267 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1268 && !scsi_sense_is_deferred(&sshdr)
1269 && sshdr.sense_key == UNIT_ATTENTION
1270 && sdp->device->removable) {
1271 /* Detected possible disc change. Set the bit - this */
1272 /* may be used if there are filesystems using this device */
1273 sdp->device->changed = 1;
1274 }
1275 }
1276 /* Rely on write phase to clean out srp status values, so no "else" */
1277
1278 if (sfp->closed) { /* whoops this fd already released, cleanup */
1279 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1280 sg_finish_rem_req(srp);
1281 srp = NULL;
1282 if (NULL == sfp->headrp) {
1283 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1284 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1285 scsi_device_put(sdp->device);
1286 }
1287 sfp = NULL;
1288 }
1289 } else if (srp && srp->orphan) {
1290 if (sfp->keep_orphan)
1291 srp->sg_io_owned = 0;
1292 else {
1293 sg_finish_rem_req(srp);
1294 srp = NULL;
1295 }
1296 }
1297 if (sfp && srp) {
1298 /* Now wake up any sg_read() that is waiting for this packet. */
1299 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1300 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1301 srp->done = 1;
1302 wake_up_interruptible(&sfp->read_wait);
1303 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1304 }
1305 }
1306
1307 static struct file_operations sg_fops = {
1308 .owner = THIS_MODULE,
1309 .read = sg_read,
1310 .write = sg_write,
1311 .poll = sg_poll,
1312 .ioctl = sg_ioctl,
1313 #ifdef CONFIG_COMPAT
1314 .compat_ioctl = sg_compat_ioctl,
1315 #endif
1316 .open = sg_open,
1317 .mmap = sg_mmap,
1318 .release = sg_release,
1319 .fasync = sg_fasync,
1320 };
1321
1322 static struct class *sg_sysfs_class;
1323
1324 static int sg_sysfs_valid = 0;
1325
1326 static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1327 {
1328 struct request_queue *q = scsidp->request_queue;
1329 Sg_device *sdp;
1330 unsigned long iflags;
1331 void *old_sg_dev_arr = NULL;
1332 int k, error;
1333
1334 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1335 if (!sdp) {
1336 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1337 return -ENOMEM;
1338 }
1339
1340 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1341 if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
1342 Sg_device **tmp_da;
1343 int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
1344 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1345
1346 tmp_da = kzalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
1347 if (unlikely(!tmp_da))
1348 goto expand_failed;
1349
1350 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1351 memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
1352 old_sg_dev_arr = sg_dev_arr;
1353 sg_dev_arr = tmp_da;
1354 sg_dev_max = tmp_dev_max;
1355 }
1356
1357 for (k = 0; k < sg_dev_max; k++)
1358 if (!sg_dev_arr[k])
1359 break;
1360 if (unlikely(k >= SG_MAX_DEVS))
1361 goto overflow;
1362
1363 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1364 sprintf(disk->disk_name, "sg%d", k);
1365 disk->first_minor = k;
1366 sdp->disk = disk;
1367 sdp->device = scsidp;
1368 init_waitqueue_head(&sdp->o_excl_wait);
1369 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
1370
1371 sg_nr_dev++;
1372 sg_dev_arr[k] = sdp;
1373 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1374 error = k;
1375
1376 out:
1377 if (error < 0)
1378 kfree(sdp);
1379 kfree(old_sg_dev_arr);
1380 return error;
1381
1382 expand_failed:
1383 printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
1384 error = -ENOMEM;
1385 goto out;
1386
1387 overflow:
1388 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1389 sdev_printk(KERN_WARNING, scsidp,
1390 "Unable to attach sg device type=%d, minor "
1391 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1392 error = -ENODEV;
1393 goto out;
1394 }
1395
1396 static int
1397 sg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
1398 {
1399 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1400 struct gendisk *disk;
1401 Sg_device *sdp = NULL;
1402 struct cdev * cdev = NULL;
1403 int error, k;
1404
1405 disk = alloc_disk(1);
1406 if (!disk) {
1407 printk(KERN_WARNING "alloc_disk failed\n");
1408 return -ENOMEM;
1409 }
1410 disk->major = SCSI_GENERIC_MAJOR;
1411
1412 error = -ENOMEM;
1413 cdev = cdev_alloc();
1414 if (!cdev) {
1415 printk(KERN_WARNING "cdev_alloc failed\n");
1416 goto out;
1417 }
1418 cdev->owner = THIS_MODULE;
1419 cdev->ops = &sg_fops;
1420
1421 error = sg_alloc(disk, scsidp);
1422 if (error < 0) {
1423 printk(KERN_WARNING "sg_alloc failed\n");
1424 goto out;
1425 }
1426 k = error;
1427 sdp = sg_dev_arr[k];
1428
1429 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
1430 if (error)
1431 goto out;
1432
1433 sdp->cdev = cdev;
1434 if (sg_sysfs_valid) {
1435 struct class_device * sg_class_member;
1436
1437 sg_class_member = class_device_create(sg_sysfs_class, NULL,
1438 MKDEV(SCSI_GENERIC_MAJOR, k),
1439 cl_dev->dev, "%s",
1440 disk->disk_name);
1441 if (IS_ERR(sg_class_member))
1442 printk(KERN_WARNING "sg_add: "
1443 "class_device_create failed\n");
1444 class_set_devdata(sg_class_member, sdp);
1445 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1446 &sg_class_member->kobj, "generic");
1447 if (error)
1448 printk(KERN_ERR "sg_add: unable to make symlink "
1449 "'generic' back to sg%d\n", k);
1450 } else
1451 printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
1452
1453 sdev_printk(KERN_NOTICE, scsidp,
1454 "Attached scsi generic sg%d type %d\n", k,scsidp->type);
1455
1456 return 0;
1457
1458 out:
1459 put_disk(disk);
1460 if (cdev)
1461 cdev_del(cdev);
1462 return error;
1463 }
1464
1465 static void
1466 sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
1467 {
1468 struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
1469 Sg_device *sdp = NULL;
1470 unsigned long iflags;
1471 Sg_fd *sfp;
1472 Sg_fd *tsfp;
1473 Sg_request *srp;
1474 Sg_request *tsrp;
1475 int k, delay;
1476
1477 if (NULL == sg_dev_arr)
1478 return;
1479 delay = 0;
1480 write_lock_irqsave(&sg_dev_arr_lock, iflags);
1481 for (k = 0; k < sg_dev_max; k++) {
1482 sdp = sg_dev_arr[k];
1483 if ((NULL == sdp) || (sdp->device != scsidp))
1484 continue; /* dirty but lowers nesting */
1485 if (sdp->headfp) {
1486 sdp->detached = 1;
1487 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1488 tsfp = sfp->nextfp;
1489 for (srp = sfp->headrp; srp; srp = tsrp) {
1490 tsrp = srp->nextrp;
1491 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1492 sg_finish_rem_req(srp);
1493 }
1494 if (sfp->closed) {
1495 scsi_device_put(sdp->device);
1496 __sg_remove_sfp(sdp, sfp);
1497 } else {
1498 delay = 1;
1499 wake_up_interruptible(&sfp->read_wait);
1500 kill_fasync(&sfp->async_qp, SIGPOLL,
1501 POLL_HUP);
1502 }
1503 }
1504 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k));
1505 if (NULL == sdp->headfp) {
1506 sg_dev_arr[k] = NULL;
1507 }
1508 } else { /* nothing active, simple case */
1509 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k));
1510 sg_dev_arr[k] = NULL;
1511 }
1512 sg_nr_dev--;
1513 break;
1514 }
1515 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
1516
1517 if (sdp) {
1518 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1519 class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k));
1520 cdev_del(sdp->cdev);
1521 sdp->cdev = NULL;
1522 put_disk(sdp->disk);
1523 sdp->disk = NULL;
1524 if (NULL == sdp->headfp)
1525 kfree((char *) sdp);
1526 }
1527
1528 if (delay)
1529 msleep(10); /* dirty detach so delay device destruction */
1530 }
1531
1532 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1533 * of sysfs parameters (which module_param doesn't yet support).
1534 * Sysfs parameters defined explicitly below.
1535 */
1536 module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO);
1537 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1538
1539 MODULE_AUTHOR("Douglas Gilbert");
1540 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1541 MODULE_LICENSE("GPL");
1542 MODULE_VERSION(SG_VERSION_STR);
1543 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1544
1545 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1546 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1547
1548 static int __init
1549 init_sg(void)
1550 {
1551 int rc;
1552
1553 if (def_reserved_size >= 0)
1554 sg_big_buff = def_reserved_size;
1555
1556 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1557 SG_MAX_DEVS, "sg");
1558 if (rc)
1559 return rc;
1560 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1561 if ( IS_ERR(sg_sysfs_class) ) {
1562 rc = PTR_ERR(sg_sysfs_class);
1563 goto err_out;
1564 }
1565 sg_sysfs_valid = 1;
1566 rc = scsi_register_interface(&sg_interface);
1567 if (0 == rc) {
1568 #ifdef CONFIG_SCSI_PROC_FS
1569 sg_proc_init();
1570 #endif /* CONFIG_SCSI_PROC_FS */
1571 return 0;
1572 }
1573 class_destroy(sg_sysfs_class);
1574 err_out:
1575 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1576 return rc;
1577 }
1578
1579 static void __exit
1580 exit_sg(void)
1581 {
1582 #ifdef CONFIG_SCSI_PROC_FS
1583 sg_proc_cleanup();
1584 #endif /* CONFIG_SCSI_PROC_FS */
1585 scsi_unregister_interface(&sg_interface);
1586 class_destroy(sg_sysfs_class);
1587 sg_sysfs_valid = 0;
1588 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1589 SG_MAX_DEVS);
1590 kfree((char *)sg_dev_arr);
1591 sg_dev_arr = NULL;
1592 sg_dev_max = 0;
1593 }
1594
1595 static int
1596 sg_start_req(Sg_request * srp)
1597 {
1598 int res;
1599 Sg_fd *sfp = srp->parentfp;
1600 sg_io_hdr_t *hp = &srp->header;
1601 int dxfer_len = (int) hp->dxfer_len;
1602 int dxfer_dir = hp->dxfer_direction;
1603 Sg_scatter_hold *req_schp = &srp->data;
1604 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1605
1606 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1607 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1608 return 0;
1609 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1610 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1611 (!sfp->parentdp->device->host->unchecked_isa_dma)) {
1612 res = sg_build_direct(srp, sfp, dxfer_len);
1613 if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1614 return res;
1615 }
1616 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1617 sg_link_reserve(sfp, srp, dxfer_len);
1618 else {
1619 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1620 if (res) {
1621 sg_remove_scat(req_schp);
1622 return res;
1623 }
1624 }
1625 return 0;
1626 }
1627
1628 static void
1629 sg_finish_rem_req(Sg_request * srp)
1630 {
1631 Sg_fd *sfp = srp->parentfp;
1632 Sg_scatter_hold *req_schp = &srp->data;
1633
1634 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1635 if (srp->res_used)
1636 sg_unlink_reserve(sfp, srp);
1637 else
1638 sg_remove_scat(req_schp);
1639 sg_remove_request(sfp, srp);
1640 }
1641
1642 static int
1643 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1644 {
1645 int sg_bufflen = tablesize * sizeof(struct scatterlist);
1646 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1647
1648 /*
1649 * TODO: test without low_dma, we should not need it since
1650 * the block layer will bounce the buffer for us
1651 *
1652 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1653 */
1654 if (sfp->low_dma)
1655 gfp_flags |= GFP_DMA;
1656 schp->buffer = kzalloc(sg_bufflen, gfp_flags);
1657 if (!schp->buffer)
1658 return -ENOMEM;
1659 schp->sglist_len = sg_bufflen;
1660 return tablesize; /* number of scat_gath elements allocated */
1661 }
1662
1663 #ifdef SG_ALLOW_DIO_CODE
1664 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1665 /* TODO: hopefully we can use the generic block layer code */
1666
1667 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1668 - mapping of all pages not successful
1669 (i.e., either completely successful or fails)
1670 */
1671 static int
1672 st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
1673 unsigned long uaddr, size_t count, int rw)
1674 {
1675 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
1676 unsigned long start = uaddr >> PAGE_SHIFT;
1677 const int nr_pages = end - start;
1678 int res, i, j;
1679 struct page **pages;
1680
1681 /* User attempted Overflow! */
1682 if ((uaddr + count) < uaddr)
1683 return -EINVAL;
1684
1685 /* Too big */
1686 if (nr_pages > max_pages)
1687 return -ENOMEM;
1688
1689 /* Hmm? */
1690 if (count == 0)
1691 return 0;
1692
1693 if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
1694 return -ENOMEM;
1695
1696 /* Try to fault in all of the necessary pages */
1697 down_read(&current->mm->mmap_sem);
1698 /* rw==READ means read from drive, write into memory area */
1699 res = get_user_pages(
1700 current,
1701 current->mm,
1702 uaddr,
1703 nr_pages,
1704 rw == READ,
1705 0, /* don't force */
1706 pages,
1707 NULL);
1708 up_read(&current->mm->mmap_sem);
1709
1710 /* Errors and no page mapped should return here */
1711 if (res < nr_pages)
1712 goto out_unmap;
1713
1714 for (i=0; i < nr_pages; i++) {
1715 /* FIXME: flush superflous for rw==READ,
1716 * probably wrong function for rw==WRITE
1717 */
1718 flush_dcache_page(pages[i]);
1719 /* ?? Is locking needed? I don't think so */
1720 /* if (TestSetPageLocked(pages[i]))
1721 goto out_unlock; */
1722 }
1723
1724 sgl[0].page = pages[0];
1725 sgl[0].offset = uaddr & ~PAGE_MASK;
1726 if (nr_pages > 1) {
1727 sgl[0].length = PAGE_SIZE - sgl[0].offset;
1728 count -= sgl[0].length;
1729 for (i=1; i < nr_pages ; i++) {
1730 sgl[i].page = pages[i];
1731 sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
1732 count -= PAGE_SIZE;
1733 }
1734 }
1735 else {
1736 sgl[0].length = count;
1737 }
1738
1739 kfree(pages);
1740 return nr_pages;
1741
1742 out_unmap:
1743 if (res > 0) {
1744 for (j=0; j < res; j++)
1745 page_cache_release(pages[j]);
1746 res = 0;
1747 }
1748 kfree(pages);
1749 return res;
1750 }
1751
1752
1753 /* And unmap them... */
1754 static int
1755 st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
1756 int dirtied)
1757 {
1758 int i;
1759
1760 for (i=0; i < nr_pages; i++) {
1761 struct page *page = sgl[i].page;
1762
1763 if (dirtied)
1764 SetPageDirty(page);
1765 /* unlock_page(page); */
1766 /* FIXME: cache flush missing for rw==READ
1767 * FIXME: call the correct reference counting function
1768 */
1769 page_cache_release(page);
1770 }
1771
1772 return 0;
1773 }
1774
1775 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1776 #endif
1777
1778
1779 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1780 static int
1781 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1782 {
1783 #ifdef SG_ALLOW_DIO_CODE
1784 sg_io_hdr_t *hp = &srp->header;
1785 Sg_scatter_hold *schp = &srp->data;
1786 int sg_tablesize = sfp->parentdp->sg_tablesize;
1787 int mx_sc_elems, res;
1788 struct scsi_device *sdev = sfp->parentdp->device;
1789
1790 if (((unsigned long)hp->dxferp &
1791 queue_dma_alignment(sdev->request_queue)) != 0)
1792 return 1;
1793
1794 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1795 if (mx_sc_elems <= 0) {
1796 return 1;
1797 }
1798 res = st_map_user_pages(schp->buffer, mx_sc_elems,
1799 (unsigned long)hp->dxferp, dxfer_len,
1800 (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
1801 if (res <= 0)
1802 return 1;
1803 schp->k_use_sg = res;
1804 schp->dio_in_use = 1;
1805 hp->info |= SG_INFO_DIRECT_IO;
1806 return 0;
1807 #else
1808 return 1;
1809 #endif
1810 }
1811
1812 static int
1813 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1814 {
1815 struct scatterlist *sg;
1816 int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
1817 int sg_tablesize = sfp->parentdp->sg_tablesize;
1818 int blk_size = buff_size;
1819 struct page *p = NULL;
1820
1821 if ((blk_size < 0) || (!sfp))
1822 return -EFAULT;
1823 if (0 == blk_size)
1824 ++blk_size; /* don't know why */
1825 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1826 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1827 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1828 buff_size, blk_size));
1829
1830 /* N.B. ret_sz carried into this block ... */
1831 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1832 if (mx_sc_elems < 0)
1833 return mx_sc_elems; /* most likely -ENOMEM */
1834
1835 for (k = 0, sg = schp->buffer, rem_sz = blk_size;
1836 (rem_sz > 0) && (k < mx_sc_elems);
1837 ++k, rem_sz -= ret_sz, ++sg) {
1838
1839 num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz;
1840 p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
1841 if (!p)
1842 return -ENOMEM;
1843
1844 sg->page = p;
1845 sg->length = ret_sz;
1846
1847 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1848 k, p, ret_sz));
1849 } /* end of for loop */
1850
1851 schp->k_use_sg = k;
1852 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz));
1853
1854 schp->bufflen = blk_size;
1855 if (rem_sz > 0) /* must have failed */
1856 return -ENOMEM;
1857
1858 return 0;
1859 }
1860
1861 static int
1862 sg_write_xfer(Sg_request * srp)
1863 {
1864 sg_io_hdr_t *hp = &srp->header;
1865 Sg_scatter_hold *schp = &srp->data;
1866 struct scatterlist *sg = schp->buffer;
1867 int num_xfer = 0;
1868 int j, k, onum, usglen, ksglen, res;
1869 int iovec_count = (int) hp->iovec_count;
1870 int dxfer_dir = hp->dxfer_direction;
1871 unsigned char *p;
1872 unsigned char __user *up;
1873 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1874
1875 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1876 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1877 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1878 if (schp->bufflen < num_xfer)
1879 num_xfer = schp->bufflen;
1880 }
1881 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1882 (new_interface
1883 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1884 return 0;
1885
1886 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1887 num_xfer, iovec_count, schp->k_use_sg));
1888 if (iovec_count) {
1889 onum = iovec_count;
1890 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
1891 return -EFAULT;
1892 } else
1893 onum = 1;
1894
1895 ksglen = sg->length;
1896 p = page_address(sg->page);
1897 for (j = 0, k = 0; j < onum; ++j) {
1898 res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
1899 if (res)
1900 return res;
1901
1902 for (; p; ++sg, ksglen = sg->length,
1903 p = page_address(sg->page)) {
1904 if (usglen <= 0)
1905 break;
1906 if (ksglen > usglen) {
1907 if (usglen >= num_xfer) {
1908 if (__copy_from_user(p, up, num_xfer))
1909 return -EFAULT;
1910 return 0;
1911 }
1912 if (__copy_from_user(p, up, usglen))
1913 return -EFAULT;
1914 p += usglen;
1915 ksglen -= usglen;
1916 break;
1917 } else {
1918 if (ksglen >= num_xfer) {
1919 if (__copy_from_user(p, up, num_xfer))
1920 return -EFAULT;
1921 return 0;
1922 }
1923 if (__copy_from_user(p, up, ksglen))
1924 return -EFAULT;
1925 up += ksglen;
1926 usglen -= ksglen;
1927 }
1928 ++k;
1929 if (k >= schp->k_use_sg)
1930 return 0;
1931 }
1932 }
1933
1934 return 0;
1935 }
1936
1937 static int
1938 sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
1939 int wr_xf, int *countp, unsigned char __user **up)
1940 {
1941 int num_xfer = (int) hp->dxfer_len;
1942 unsigned char __user *p = hp->dxferp;
1943 int count;
1944
1945 if (0 == sg_num) {
1946 if (wr_xf && ('\0' == hp->interface_id))
1947 count = (int) hp->flags; /* holds "old" input_size */
1948 else
1949 count = num_xfer;
1950 } else {
1951 sg_iovec_t iovec;
1952 if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
1953 return -EFAULT;
1954 p = iovec.iov_base;
1955 count = (int) iovec.iov_len;
1956 }
1957 if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
1958 return -EFAULT;
1959 if (up)
1960 *up = p;
1961 if (countp)
1962 *countp = count;
1963 return 0;
1964 }
1965
1966 static void
1967 sg_remove_scat(Sg_scatter_hold * schp)
1968 {
1969 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1970 if (schp->buffer && (schp->sglist_len > 0)) {
1971 struct scatterlist *sg = schp->buffer;
1972
1973 if (schp->dio_in_use) {
1974 #ifdef SG_ALLOW_DIO_CODE
1975 st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
1976 #endif
1977 } else {
1978 int k;
1979
1980 for (k = 0; (k < schp->k_use_sg) && sg->page;
1981 ++k, ++sg) {
1982 SCSI_LOG_TIMEOUT(5, printk(
1983 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
1984 k, sg->page, sg->length));
1985 sg_page_free(sg->page, sg->length);
1986 }
1987 }
1988 kfree(schp->buffer);
1989 }
1990 memset(schp, 0, sizeof (*schp));
1991 }
1992
1993 static int
1994 sg_read_xfer(Sg_request * srp)
1995 {
1996 sg_io_hdr_t *hp = &srp->header;
1997 Sg_scatter_hold *schp = &srp->data;
1998 struct scatterlist *sg = schp->buffer;
1999 int num_xfer = 0;
2000 int j, k, onum, usglen, ksglen, res;
2001 int iovec_count = (int) hp->iovec_count;
2002 int dxfer_dir = hp->dxfer_direction;
2003 unsigned char *p;
2004 unsigned char __user *up;
2005 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
2006
2007 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
2008 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
2009 num_xfer = hp->dxfer_len;
2010 if (schp->bufflen < num_xfer)
2011 num_xfer = schp->bufflen;
2012 }
2013 if ((num_xfer <= 0) || (schp->dio_in_use) ||
2014 (new_interface
2015 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
2016 return 0;
2017
2018 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2019 num_xfer, iovec_count, schp->k_use_sg));
2020 if (iovec_count) {
2021 onum = iovec_count;
2022 if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
2023 return -EFAULT;
2024 } else
2025 onum = 1;
2026
2027 p = page_address(sg->page);
2028 ksglen = sg->length;
2029 for (j = 0, k = 0; j < onum; ++j) {
2030 res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
2031 if (res)
2032 return res;
2033
2034 for (; p; ++sg, ksglen = sg->length,
2035 p = page_address(sg->page)) {
2036 if (usglen <= 0)
2037 break;
2038 if (ksglen > usglen) {
2039 if (usglen >= num_xfer) {
2040 if (__copy_to_user(up, p, num_xfer))
2041 return -EFAULT;
2042 return 0;
2043 }
2044 if (__copy_to_user(up, p, usglen))
2045 return -EFAULT;
2046 p += usglen;
2047 ksglen -= usglen;
2048 break;
2049 } else {
2050 if (ksglen >= num_xfer) {
2051 if (__copy_to_user(up, p, num_xfer))
2052 return -EFAULT;
2053 return 0;
2054 }
2055 if (__copy_to_user(up, p, ksglen))
2056 return -EFAULT;
2057 up += ksglen;
2058 usglen -= ksglen;
2059 }
2060 ++k;
2061 if (k >= schp->k_use_sg)
2062 return 0;
2063 }
2064 }
2065
2066 return 0;
2067 }
2068
2069 static int
2070 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
2071 {
2072 Sg_scatter_hold *schp = &srp->data;
2073 struct scatterlist *sg = schp->buffer;
2074 int k, num;
2075
2076 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2077 num_read_xfer));
2078 if ((!outp) || (num_read_xfer <= 0))
2079 return 0;
2080
2081 for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) {
2082 num = sg->length;
2083 if (num > num_read_xfer) {
2084 if (__copy_to_user(outp, page_address(sg->page),
2085 num_read_xfer))
2086 return -EFAULT;
2087 break;
2088 } else {
2089 if (__copy_to_user(outp, page_address(sg->page),
2090 num))
2091 return -EFAULT;
2092 num_read_xfer -= num;
2093 if (num_read_xfer <= 0)
2094 break;
2095 outp += num;
2096 }
2097 }
2098
2099 return 0;
2100 }
2101
2102 static void
2103 sg_build_reserve(Sg_fd * sfp, int req_size)
2104 {
2105 Sg_scatter_hold *schp = &sfp->reserve;
2106
2107 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
2108 do {
2109 if (req_size < PAGE_SIZE)
2110 req_size = PAGE_SIZE;
2111 if (0 == sg_build_indirect(schp, sfp, req_size))
2112 return;
2113 else
2114 sg_remove_scat(schp);
2115 req_size >>= 1; /* divide by 2 */
2116 } while (req_size > (PAGE_SIZE / 2));
2117 }
2118
2119 static void
2120 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
2121 {
2122 Sg_scatter_hold *req_schp = &srp->data;
2123 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2124 struct scatterlist *sg = rsv_schp->buffer;
2125 int k, num, rem;
2126
2127 srp->res_used = 1;
2128 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
2129 rem = size;
2130
2131 for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) {
2132 num = sg->length;
2133 if (rem <= num) {
2134 sfp->save_scat_len = num;
2135 sg->length = rem;
2136 req_schp->k_use_sg = k + 1;
2137 req_schp->sglist_len = rsv_schp->sglist_len;
2138 req_schp->buffer = rsv_schp->buffer;
2139
2140 req_schp->bufflen = size;
2141 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
2142 break;
2143 } else
2144 rem -= num;
2145 }
2146
2147 if (k >= rsv_schp->k_use_sg)
2148 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2149 }
2150
2151 static void
2152 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2153 {
2154 Sg_scatter_hold *req_schp = &srp->data;
2155 Sg_scatter_hold *rsv_schp = &sfp->reserve;
2156
2157 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2158 (int) req_schp->k_use_sg));
2159 if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
2160 struct scatterlist *sg = rsv_schp->buffer;
2161
2162 if (sfp->save_scat_len > 0)
2163 (sg + (req_schp->k_use_sg - 1))->length =
2164 (unsigned) sfp->save_scat_len;
2165 else
2166 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2167 }
2168 req_schp->k_use_sg = 0;
2169 req_schp->bufflen = 0;
2170 req_schp->buffer = NULL;
2171 req_schp->sglist_len = 0;
2172 sfp->save_scat_len = 0;
2173 srp->res_used = 0;
2174 }
2175
2176 static Sg_request *
2177 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2178 {
2179 Sg_request *resp;
2180 unsigned long iflags;
2181
2182 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2183 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2184 /* look for requests that are ready + not SG_IO owned */
2185 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2186 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2187 resp->done = 2; /* guard against other readers */
2188 break;
2189 }
2190 }
2191 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2192 return resp;
2193 }
2194
2195 #ifdef CONFIG_SCSI_PROC_FS
2196 static Sg_request *
2197 sg_get_nth_request(Sg_fd * sfp, int nth)
2198 {
2199 Sg_request *resp;
2200 unsigned long iflags;
2201 int k;
2202
2203 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2204 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2205 ++k, resp = resp->nextrp) ;
2206 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2207 return resp;
2208 }
2209 #endif
2210
2211 /* always adds to end of list */
2212 static Sg_request *
2213 sg_add_request(Sg_fd * sfp)
2214 {
2215 int k;
2216 unsigned long iflags;
2217 Sg_request *resp;
2218 Sg_request *rp = sfp->req_arr;
2219
2220 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2221 resp = sfp->headrp;
2222 if (!resp) {
2223 memset(rp, 0, sizeof (Sg_request));
2224 rp->parentfp = sfp;
2225 resp = rp;
2226 sfp->headrp = resp;
2227 } else {
2228 if (0 == sfp->cmd_q)
2229 resp = NULL; /* command queuing disallowed */
2230 else {
2231 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2232 if (!rp->parentfp)
2233 break;
2234 }
2235 if (k < SG_MAX_QUEUE) {
2236 memset(rp, 0, sizeof (Sg_request));
2237 rp->parentfp = sfp;
2238 while (resp->nextrp)
2239 resp = resp->nextrp;
2240 resp->nextrp = rp;
2241 resp = rp;
2242 } else
2243 resp = NULL;
2244 }
2245 }
2246 if (resp) {
2247 resp->nextrp = NULL;
2248 resp->header.duration = jiffies_to_msecs(jiffies);
2249 }
2250 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2251 return resp;
2252 }
2253
2254 /* Return of 1 for found; 0 for not found */
2255 static int
2256 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2257 {
2258 Sg_request *prev_rp;
2259 Sg_request *rp;
2260 unsigned long iflags;
2261 int res = 0;
2262
2263 if ((!sfp) || (!srp) || (!sfp->headrp))
2264 return res;
2265 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2266 prev_rp = sfp->headrp;
2267 if (srp == prev_rp) {
2268 sfp->headrp = prev_rp->nextrp;
2269 prev_rp->parentfp = NULL;
2270 res = 1;
2271 } else {
2272 while ((rp = prev_rp->nextrp)) {
2273 if (srp == rp) {
2274 prev_rp->nextrp = rp->nextrp;
2275 rp->parentfp = NULL;
2276 res = 1;
2277 break;
2278 }
2279 prev_rp = rp;
2280 }
2281 }
2282 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2283 return res;
2284 }
2285
2286 #ifdef CONFIG_SCSI_PROC_FS
2287 static Sg_fd *
2288 sg_get_nth_sfp(Sg_device * sdp, int nth)
2289 {
2290 Sg_fd *resp;
2291 unsigned long iflags;
2292 int k;
2293
2294 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2295 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2296 ++k, resp = resp->nextfp) ;
2297 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2298 return resp;
2299 }
2300 #endif
2301
2302 static Sg_fd *
2303 sg_add_sfp(Sg_device * sdp, int dev)
2304 {
2305 Sg_fd *sfp;
2306 unsigned long iflags;
2307
2308 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2309 if (!sfp)
2310 return NULL;
2311
2312 init_waitqueue_head(&sfp->read_wait);
2313 rwlock_init(&sfp->rq_list_lock);
2314
2315 sfp->timeout = SG_DEFAULT_TIMEOUT;
2316 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2317 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2318 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2319 sdp->device->host->unchecked_isa_dma : 1;
2320 sfp->cmd_q = SG_DEF_COMMAND_Q;
2321 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2322 sfp->parentdp = sdp;
2323 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2324 if (!sdp->headfp)
2325 sdp->headfp = sfp;
2326 else { /* add to tail of existing list */
2327 Sg_fd *pfp = sdp->headfp;
2328 while (pfp->nextfp)
2329 pfp = pfp->nextfp;
2330 pfp->nextfp = sfp;
2331 }
2332 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2333 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2334 sg_build_reserve(sfp, sg_big_buff);
2335 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2336 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2337 return sfp;
2338 }
2339
2340 static void
2341 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2342 {
2343 Sg_fd *fp;
2344 Sg_fd *prev_fp;
2345
2346 prev_fp = sdp->headfp;
2347 if (sfp == prev_fp)
2348 sdp->headfp = prev_fp->nextfp;
2349 else {
2350 while ((fp = prev_fp->nextfp)) {
2351 if (sfp == fp) {
2352 prev_fp->nextfp = fp->nextfp;
2353 break;
2354 }
2355 prev_fp = fp;
2356 }
2357 }
2358 if (sfp->reserve.bufflen > 0) {
2359 SCSI_LOG_TIMEOUT(6,
2360 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2361 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2362 sg_remove_scat(&sfp->reserve);
2363 }
2364 sfp->parentdp = NULL;
2365 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2366 kfree(sfp);
2367 }
2368
2369 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2370 static int
2371 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2372 {
2373 Sg_request *srp;
2374 Sg_request *tsrp;
2375 int dirty = 0;
2376 int res = 0;
2377
2378 for (srp = sfp->headrp; srp; srp = tsrp) {
2379 tsrp = srp->nextrp;
2380 if (sg_srp_done(srp, sfp))
2381 sg_finish_rem_req(srp);
2382 else
2383 ++dirty;
2384 }
2385 if (0 == dirty) {
2386 unsigned long iflags;
2387
2388 write_lock_irqsave(&sg_dev_arr_lock, iflags);
2389 __sg_remove_sfp(sdp, sfp);
2390 if (sdp->detached && (NULL == sdp->headfp)) {
2391 int k, maxd;
2392
2393 maxd = sg_dev_max;
2394 for (k = 0; k < maxd; ++k) {
2395 if (sdp == sg_dev_arr[k])
2396 break;
2397 }
2398 if (k < maxd)
2399 sg_dev_arr[k] = NULL;
2400 kfree((char *) sdp);
2401 res = 1;
2402 }
2403 write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2404 } else {
2405 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2406 /* only bump the access_count if we actually succeeded in
2407 * throwing another counter on the host module */
2408 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2409 sfp->closed = 1; /* flag dirty state on this fd */
2410 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2411 dirty));
2412 }
2413 return res;
2414 }
2415
2416 static int
2417 sg_res_in_use(Sg_fd * sfp)
2418 {
2419 const Sg_request *srp;
2420 unsigned long iflags;
2421
2422 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2423 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2424 if (srp->res_used)
2425 break;
2426 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2427 return srp ? 1 : 0;
2428 }
2429
2430 /* If retSzp==NULL want exact size or fail */
2431 static struct page *
2432 sg_page_malloc(int rqSz, int lowDma, int *retSzp)
2433 {
2434 struct page *resp = NULL;
2435 gfp_t page_mask;
2436 int order, a_size;
2437 int resSz = rqSz;
2438
2439 if (rqSz <= 0)
2440 return resp;
2441
2442 if (lowDma)
2443 page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
2444 else
2445 page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
2446
2447 for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
2448 order++, a_size <<= 1) ;
2449 resp = alloc_pages(page_mask, order);
2450 while ((!resp) && order && retSzp) {
2451 --order;
2452 a_size >>= 1; /* divide by 2, until PAGE_SIZE */
2453 resp = alloc_pages(page_mask, order); /* try half */
2454 resSz = a_size;
2455 }
2456 if (resp) {
2457 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2458 memset(page_address(resp), 0, resSz);
2459 if (retSzp)
2460 *retSzp = resSz;
2461 }
2462 return resp;
2463 }
2464
2465 static void
2466 sg_page_free(struct page *page, int size)
2467 {
2468 int order, a_size;
2469
2470 if (!page)
2471 return;
2472 for (order = 0, a_size = PAGE_SIZE; a_size < size;
2473 order++, a_size <<= 1) ;
2474 __free_pages(page, order);
2475 }
2476
2477 #ifndef MAINTENANCE_IN_CMD
2478 #define MAINTENANCE_IN_CMD 0xa3
2479 #endif
2480
2481 static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
2482 INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
2483 READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
2484 SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
2485 };
2486
2487 static int
2488 sg_allow_access(unsigned char opcode, char dev_type)
2489 {
2490 int k;
2491
2492 if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
2493 return 1;
2494 for (k = 0; k < sizeof (allow_ops); ++k) {
2495 if (opcode == allow_ops[k])
2496 return 1;
2497 }
2498 return 0;
2499 }
2500
2501 #ifdef CONFIG_SCSI_PROC_FS
2502 static int
2503 sg_last_dev(void)
2504 {
2505 int k;
2506 unsigned long iflags;
2507
2508 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2509 for (k = sg_dev_max - 1; k >= 0; --k)
2510 if (sg_dev_arr[k] && sg_dev_arr[k]->device)
2511 break;
2512 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2513 return k + 1; /* origin 1 */
2514 }
2515 #endif
2516
2517 static Sg_device *
2518 sg_get_dev(int dev)
2519 {
2520 Sg_device *sdp = NULL;
2521 unsigned long iflags;
2522
2523 if (sg_dev_arr && (dev >= 0)) {
2524 read_lock_irqsave(&sg_dev_arr_lock, iflags);
2525 if (dev < sg_dev_max)
2526 sdp = sg_dev_arr[dev];
2527 read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
2528 }
2529 return sdp;
2530 }
2531
2532 #ifdef CONFIG_SCSI_PROC_FS
2533
2534 static struct proc_dir_entry *sg_proc_sgp = NULL;
2535
2536 static char sg_proc_sg_dirname[] = "scsi/sg";
2537
2538 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2539
2540 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2541 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2542 size_t count, loff_t *off);
2543 static struct file_operations adio_fops = {
2544 /* .owner, .read and .llseek added in sg_proc_init() */
2545 .open = sg_proc_single_open_adio,
2546 .write = sg_proc_write_adio,
2547 .release = single_release,
2548 };
2549
2550 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2551 static ssize_t sg_proc_write_dressz(struct file *filp,
2552 const char __user *buffer, size_t count, loff_t *off);
2553 static struct file_operations dressz_fops = {
2554 .open = sg_proc_single_open_dressz,
2555 .write = sg_proc_write_dressz,
2556 .release = single_release,
2557 };
2558
2559 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2560 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2561 static struct file_operations version_fops = {
2562 .open = sg_proc_single_open_version,
2563 .release = single_release,
2564 };
2565
2566 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2567 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2568 static struct file_operations devhdr_fops = {
2569 .open = sg_proc_single_open_devhdr,
2570 .release = single_release,
2571 };
2572
2573 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2574 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2575 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2576 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2577 static void dev_seq_stop(struct seq_file *s, void *v);
2578 static struct file_operations dev_fops = {
2579 .open = sg_proc_open_dev,
2580 .release = seq_release,
2581 };
2582 static struct seq_operations dev_seq_ops = {
2583 .start = dev_seq_start,
2584 .next = dev_seq_next,
2585 .stop = dev_seq_stop,
2586 .show = sg_proc_seq_show_dev,
2587 };
2588
2589 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2590 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2591 static struct file_operations devstrs_fops = {
2592 .open = sg_proc_open_devstrs,
2593 .release = seq_release,
2594 };
2595 static struct seq_operations devstrs_seq_ops = {
2596 .start = dev_seq_start,
2597 .next = dev_seq_next,
2598 .stop = dev_seq_stop,
2599 .show = sg_proc_seq_show_devstrs,
2600 };
2601
2602 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2603 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2604 static struct file_operations debug_fops = {
2605 .open = sg_proc_open_debug,
2606 .release = seq_release,
2607 };
2608 static struct seq_operations debug_seq_ops = {
2609 .start = dev_seq_start,
2610 .next = dev_seq_next,
2611 .stop = dev_seq_stop,
2612 .show = sg_proc_seq_show_debug,
2613 };
2614
2615
2616 struct sg_proc_leaf {
2617 const char * name;
2618 struct file_operations * fops;
2619 };
2620
2621 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2622 {"allow_dio", &adio_fops},
2623 {"debug", &debug_fops},
2624 {"def_reserved_size", &dressz_fops},
2625 {"device_hdr", &devhdr_fops},
2626 {"devices", &dev_fops},
2627 {"device_strs", &devstrs_fops},
2628 {"version", &version_fops}
2629 };
2630
2631 static int
2632 sg_proc_init(void)
2633 {
2634 int k, mask;
2635 int num_leaves =
2636 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2637 struct proc_dir_entry *pdep;
2638 struct sg_proc_leaf * leaf;
2639
2640 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2641 if (!sg_proc_sgp)
2642 return 1;
2643 for (k = 0; k < num_leaves; ++k) {
2644 leaf = &sg_proc_leaf_arr[k];
2645 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2646 pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
2647 if (pdep) {
2648 leaf->fops->owner = THIS_MODULE,
2649 leaf->fops->read = seq_read,
2650 leaf->fops->llseek = seq_lseek,
2651 pdep->proc_fops = leaf->fops;
2652 }
2653 }
2654 return 0;
2655 }
2656
2657 static void
2658 sg_proc_cleanup(void)
2659 {
2660 int k;
2661 int num_leaves =
2662 sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]);
2663
2664 if (!sg_proc_sgp)
2665 return;
2666 for (k = 0; k < num_leaves; ++k)
2667 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2668 remove_proc_entry(sg_proc_sg_dirname, NULL);
2669 }
2670
2671
2672 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2673 {
2674 seq_printf(s, "%d\n", *((int *)s->private));
2675 return 0;
2676 }
2677
2678 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2679 {
2680 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2681 }
2682
2683 static ssize_t
2684 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2685 size_t count, loff_t *off)
2686 {
2687 int num;
2688 char buff[11];
2689
2690 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2691 return -EACCES;
2692 num = (count < 10) ? count : 10;
2693 if (copy_from_user(buff, buffer, num))
2694 return -EFAULT;
2695 buff[num] = '\0';
2696 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2697 return count;
2698 }
2699
2700 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2701 {
2702 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2703 }
2704
2705 static ssize_t
2706 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2707 size_t count, loff_t *off)
2708 {
2709 int num;
2710 unsigned long k = ULONG_MAX;
2711 char buff[11];
2712
2713 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2714 return -EACCES;
2715 num = (count < 10) ? count : 10;
2716 if (copy_from_user(buff, buffer, num))
2717 return -EFAULT;
2718 buff[num] = '\0';
2719 k = simple_strtoul(buff, NULL, 10);
2720 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2721 sg_big_buff = k;
2722 return count;
2723 }
2724 return -ERANGE;
2725 }
2726
2727 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2728 {
2729 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2730 sg_version_date);
2731 return 0;
2732 }
2733
2734 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2735 {
2736 return single_open(file, sg_proc_seq_show_version, NULL);
2737 }
2738
2739 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2740 {
2741 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2742 "online\n");
2743 return 0;
2744 }
2745
2746 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2747 {
2748 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2749 }
2750
2751 struct sg_proc_deviter {
2752 loff_t index;
2753 size_t max;
2754 };
2755
2756 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2757 {
2758 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2759
2760 s->private = it;
2761 if (! it)
2762 return NULL;
2763
2764 if (NULL == sg_dev_arr)
2765 return NULL;
2766 it->index = *pos;
2767 it->max = sg_last_dev();
2768 if (it->index >= it->max)
2769 return NULL;
2770 return it;
2771 }
2772
2773 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2774 {
2775 struct sg_proc_deviter * it = s->private;
2776
2777 *pos = ++it->index;
2778 return (it->index < it->max) ? it : NULL;
2779 }
2780
2781 static void dev_seq_stop(struct seq_file *s, void *v)
2782 {
2783 kfree(s->private);
2784 }
2785
2786 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2787 {
2788 return seq_open(file, &dev_seq_ops);
2789 }
2790
2791 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2792 {
2793 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2794 Sg_device *sdp;
2795 struct scsi_device *scsidp;
2796
2797 sdp = it ? sg_get_dev(it->index) : NULL;
2798 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2799 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2800 scsidp->host->host_no, scsidp->channel,
2801 scsidp->id, scsidp->lun, (int) scsidp->type,
2802 1,
2803 (int) scsidp->queue_depth,
2804 (int) scsidp->device_busy,
2805 (int) scsi_device_online(scsidp));
2806 else
2807 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2808 return 0;
2809 }
2810
2811 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2812 {
2813 return seq_open(file, &devstrs_seq_ops);
2814 }
2815
2816 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2817 {
2818 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2819 Sg_device *sdp;
2820 struct scsi_device *scsidp;
2821
2822 sdp = it ? sg_get_dev(it->index) : NULL;
2823 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2824 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2825 scsidp->vendor, scsidp->model, scsidp->rev);
2826 else
2827 seq_printf(s, "<no active device>\n");
2828 return 0;
2829 }
2830
2831 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2832 {
2833 int k, m, new_interface, blen, usg;
2834 Sg_request *srp;
2835 Sg_fd *fp;
2836 const sg_io_hdr_t *hp;
2837 const char * cp;
2838 unsigned int ms;
2839
2840 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2841 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2842 "(res)sgat=%d low_dma=%d\n", k + 1,
2843 jiffies_to_msecs(fp->timeout),
2844 fp->reserve.bufflen,
2845 (int) fp->reserve.k_use_sg,
2846 (int) fp->low_dma);
2847 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2848 (int) fp->cmd_q, (int) fp->force_packid,
2849 (int) fp->keep_orphan, (int) fp->closed);
2850 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2851 hp = &srp->header;
2852 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2853 if (srp->res_used) {
2854 if (new_interface &&
2855 (SG_FLAG_MMAP_IO & hp->flags))
2856 cp = " mmap>> ";
2857 else
2858 cp = " rb>> ";
2859 } else {
2860 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2861 cp = " dio>> ";
2862 else
2863 cp = " ";
2864 }
2865 seq_printf(s, cp);
2866 blen = srp->data.bufflen;
2867 usg = srp->data.k_use_sg;
2868 seq_printf(s, srp->done ?
2869 ((1 == srp->done) ? "rcv:" : "fin:")
2870 : "act:");
2871 seq_printf(s, " id=%d blen=%d",
2872 srp->header.pack_id, blen);
2873 if (srp->done)
2874 seq_printf(s, " dur=%d", hp->duration);
2875 else {
2876 ms = jiffies_to_msecs(jiffies);
2877 seq_printf(s, " t_o/elap=%d/%d",
2878 (new_interface ? hp->timeout :
2879 jiffies_to_msecs(fp->timeout)),
2880 (ms > hp->duration ? ms - hp->duration : 0));
2881 }
2882 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2883 (int) srp->data.cmd_opcode);
2884 }
2885 if (0 == m)
2886 seq_printf(s, " No requests active\n");
2887 }
2888 }
2889
2890 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2891 {
2892 return seq_open(file, &debug_seq_ops);
2893 }
2894
2895 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2896 {
2897 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2898 Sg_device *sdp;
2899
2900 if (it && (0 == it->index)) {
2901 seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
2902 "(origin 1)\n", sg_dev_max, (int)it->max);
2903 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2904 }
2905 sdp = it ? sg_get_dev(it->index) : NULL;
2906 if (sdp) {
2907 struct scsi_device *scsidp = sdp->device;
2908
2909 if (NULL == scsidp) {
2910 seq_printf(s, "device %d detached ??\n",
2911 (int)it->index);
2912 return 0;
2913 }
2914
2915 if (sg_get_nth_sfp(sdp, 0)) {
2916 seq_printf(s, " >>> device=%s ",
2917 sdp->disk->disk_name);
2918 if (sdp->detached)
2919 seq_printf(s, "detached pending close ");
2920 else
2921 seq_printf
2922 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2923 scsidp->host->host_no,
2924 scsidp->channel, scsidp->id,
2925 scsidp->lun,
2926 scsidp->host->hostt->emulated);
2927 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2928 sdp->sg_tablesize, sdp->exclude);
2929 }
2930 sg_proc_debug_helper(s, sdp);
2931 }
2932 return 0;
2933 }
2934
2935 #endif /* CONFIG_SCSI_PROC_FS */
2936
2937 module_init(init_sg);
2938 module_exit(exit_sg);
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