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
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
12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
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)
21 static int sg_version_num
= 30532; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.32"
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).
31 #include <linux/config.h>
32 #include <linux/module.h>
35 #include <linux/kernel.h>
36 #include <linux/sched.h>
37 #include <linux/string.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>
54 #include <scsi/scsi_host.h>
55 #include <scsi/scsi_driver.h>
56 #include <scsi/scsi_ioctl.h>
59 #include "scsi_logging.h"
61 #ifdef CONFIG_SCSI_PROC_FS
62 #include <linux/proc_fs.h>
63 static char *sg_version_date
= "20050117";
65 static int sg_proc_init(void);
66 static void sg_proc_cleanup(void);
69 #ifndef LINUX_VERSION_CODE
70 #include <linux/version.h>
71 #endif /* LINUX_VERSION_CODE */
73 #define SG_ALLOW_DIO_DEF 0
74 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
76 #define SG_MAX_DEVS 32768
79 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
80 * Then when using 32 bit integers x * m may overflow during the calculation.
81 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
82 * calculates the same, but prevents the overflow when both m and d
83 * are "small" numbers (like HZ and USER_HZ).
84 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
87 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
89 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
91 int sg_big_buff
= SG_DEF_RESERVED_SIZE
;
92 /* N.B. This variable is readable and writeable via
93 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
94 of this size (or less if there is not enough memory) will be reserved
95 for use by this file descriptor. [Deprecated usage: this variable is also
96 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
97 the kernel (i.e. it is not a module).] */
98 static int def_reserved_size
= -1; /* picks up init parameter */
99 static int sg_allow_dio
= SG_ALLOW_DIO_DEF
;
101 #define SG_SECTOR_SZ 512
102 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
104 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
106 static int sg_add(struct class_device
*);
107 static void sg_remove(struct class_device
*);
109 static Scsi_Request
*dummy_cmdp
; /* only used for sizeof */
111 static DEFINE_RWLOCK(sg_dev_arr_lock
); /* Also used to lock
112 file descriptor list for device */
114 static struct class_interface sg_interface
= {
119 typedef struct sg_scatter_hold
{ /* holding area for scsi scatter gather info */
120 unsigned short k_use_sg
; /* Count of kernel scatter-gather pieces */
121 unsigned short sglist_len
; /* size of malloc'd scatter-gather list ++ */
122 unsigned bufflen
; /* Size of (aggregate) data buffer */
123 unsigned b_malloc_len
; /* actual len malloc'ed in buffer */
124 void *buffer
; /* Data buffer or scatter list (k_use_sg>0) */
125 char dio_in_use
; /* 0->indirect IO (or mmap), 1->dio */
126 unsigned char cmd_opcode
; /* first byte of command */
129 struct sg_device
; /* forward declarations */
132 typedef struct sg_request
{ /* SG_MAX_QUEUE requests outstanding per file */
133 Scsi_Request
*my_cmdp
; /* != 0 when request with lower levels */
134 struct sg_request
*nextrp
; /* NULL -> tail request (slist) */
135 struct sg_fd
*parentfp
; /* NULL -> not in use */
136 Sg_scatter_hold data
; /* hold buffer, perhaps scatter list */
137 sg_io_hdr_t header
; /* scsi command+info, see <scsi/sg.h> */
138 unsigned char sense_b
[sizeof (dummy_cmdp
->sr_sense_buffer
)];
139 char res_used
; /* 1 -> using reserve buffer, 0 -> not ... */
140 char orphan
; /* 1 -> drop on sight, 0 -> normal */
141 char sg_io_owned
; /* 1 -> packet belongs to SG_IO */
142 volatile char done
; /* 0->before bh, 1->before read, 2->read */
145 typedef struct sg_fd
{ /* holds the state of a file descriptor */
146 struct sg_fd
*nextfp
; /* NULL when last opened fd on this device */
147 struct sg_device
*parentdp
; /* owning device */
148 wait_queue_head_t read_wait
; /* queue read until command done */
149 rwlock_t rq_list_lock
; /* protect access to list in req_arr */
150 int timeout
; /* defaults to SG_DEFAULT_TIMEOUT */
151 int timeout_user
; /* defaults to SG_DEFAULT_TIMEOUT_USER */
152 Sg_scatter_hold reserve
; /* buffer held for this file descriptor */
153 unsigned save_scat_len
; /* original length of trunc. scat. element */
154 Sg_request
*headrp
; /* head of request slist, NULL->empty */
155 struct fasync_struct
*async_qp
; /* used by asynchronous notification */
156 Sg_request req_arr
[SG_MAX_QUEUE
]; /* used as singly-linked list */
157 char low_dma
; /* as in parent but possibly overridden to 1 */
158 char force_packid
; /* 1 -> pack_id input to read(), 0 -> ignored */
159 volatile char closed
; /* 1 -> fd closed but request(s) outstanding */
160 char cmd_q
; /* 1 -> allow command queuing, 0 -> don't */
161 char next_cmd_len
; /* 0 -> automatic (def), >0 -> use on next write() */
162 char keep_orphan
; /* 0 -> drop orphan (def), 1 -> keep for read() */
163 char mmap_called
; /* 0 -> mmap() never called on this fd */
166 typedef struct sg_device
{ /* holds the state of each scsi generic device */
167 struct scsi_device
*device
;
168 wait_queue_head_t o_excl_wait
; /* queue open() when O_EXCL in use */
169 int sg_tablesize
; /* adapter's max scatter-gather table size */
170 Sg_fd
*headfp
; /* first open fd belonging to this device */
171 volatile char detached
; /* 0->attached, 1->detached pending removal */
172 volatile char exclude
; /* opened for exclusive access */
173 char sgdebug
; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
174 struct gendisk
*disk
;
175 struct cdev
* cdev
; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
178 static int sg_fasync(int fd
, struct file
*filp
, int mode
);
179 static void sg_cmd_done(Scsi_Cmnd
* SCpnt
); /* tasklet or soft irq callback */
180 static int sg_start_req(Sg_request
* srp
);
181 static void sg_finish_rem_req(Sg_request
* srp
);
182 static int sg_build_indirect(Sg_scatter_hold
* schp
, Sg_fd
* sfp
, int buff_size
);
183 static int sg_build_sgat(Sg_scatter_hold
* schp
, const Sg_fd
* sfp
,
185 static ssize_t
sg_new_read(Sg_fd
* sfp
, char __user
*buf
, size_t count
,
187 static ssize_t
sg_new_write(Sg_fd
* sfp
, const char __user
*buf
, size_t count
,
188 int blocking
, int read_only
, Sg_request
** o_srp
);
189 static int sg_common_write(Sg_fd
* sfp
, Sg_request
* srp
,
190 unsigned char *cmnd
, int timeout
, int blocking
);
191 static int sg_u_iovec(sg_io_hdr_t
* hp
, int sg_num
, int ind
,
192 int wr_xf
, int *countp
, unsigned char __user
**up
);
193 static int sg_write_xfer(Sg_request
* srp
);
194 static int sg_read_xfer(Sg_request
* srp
);
195 static int sg_read_oxfer(Sg_request
* srp
, char __user
*outp
, int num_read_xfer
);
196 static void sg_remove_scat(Sg_scatter_hold
* schp
);
197 static void sg_build_reserve(Sg_fd
* sfp
, int req_size
);
198 static void sg_link_reserve(Sg_fd
* sfp
, Sg_request
* srp
, int size
);
199 static void sg_unlink_reserve(Sg_fd
* sfp
, Sg_request
* srp
);
200 static char *sg_page_malloc(int rqSz
, int lowDma
, int *retSzp
);
201 static void sg_page_free(char *buff
, int size
);
202 static Sg_fd
*sg_add_sfp(Sg_device
* sdp
, int dev
);
203 static int sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
);
204 static void __sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
);
205 static Sg_request
*sg_get_rq_mark(Sg_fd
* sfp
, int pack_id
);
206 static Sg_request
*sg_add_request(Sg_fd
* sfp
);
207 static int sg_remove_request(Sg_fd
* sfp
, Sg_request
* srp
);
208 static int sg_res_in_use(Sg_fd
* sfp
);
209 static int sg_allow_access(unsigned char opcode
, char dev_type
);
210 static int sg_build_direct(Sg_request
* srp
, Sg_fd
* sfp
, int dxfer_len
);
211 static Sg_device
*sg_get_dev(int dev
);
212 static inline unsigned char *sg_scatg2virt(const struct scatterlist
*sclp
);
213 #ifdef CONFIG_SCSI_PROC_FS
214 static int sg_last_dev(void);
217 static Sg_device
**sg_dev_arr
= NULL
;
218 static int sg_dev_max
;
219 static int sg_nr_dev
;
221 #define SZ_SG_HEADER sizeof(struct sg_header)
222 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
223 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
224 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
227 sg_open(struct inode
*inode
, struct file
*filp
)
229 int dev
= iminor(inode
);
230 int flags
= filp
->f_flags
;
236 nonseekable_open(inode
, filp
);
237 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev
, flags
));
238 sdp
= sg_get_dev(dev
);
239 if ((!sdp
) || (!sdp
->device
))
244 /* This driver's module count bumped by fops_get in <linux/fs.h> */
245 /* Prevent the device driver from vanishing while we sleep */
246 retval
= scsi_device_get(sdp
->device
);
250 if (!((flags
& O_NONBLOCK
) ||
251 scsi_block_when_processing_errors(sdp
->device
))) {
253 /* we are in error recovery for this device */
257 if (flags
& O_EXCL
) {
258 if (O_RDONLY
== (flags
& O_ACCMODE
)) {
259 retval
= -EPERM
; /* Can't lock it with read only access */
262 if (sdp
->headfp
&& (flags
& O_NONBLOCK
)) {
267 __wait_event_interruptible(sdp
->o_excl_wait
,
268 ((sdp
->headfp
|| sdp
->exclude
) ? 0 : (sdp
->exclude
= 1)), res
);
270 retval
= res
; /* -ERESTARTSYS because signal hit process */
273 } else if (sdp
->exclude
) { /* some other fd has an exclusive lock on dev */
274 if (flags
& O_NONBLOCK
) {
279 __wait_event_interruptible(sdp
->o_excl_wait
, (!sdp
->exclude
),
282 retval
= res
; /* -ERESTARTSYS because signal hit process */
290 if (!sdp
->headfp
) { /* no existing opens on this device */
292 sdp
->sg_tablesize
= sdp
->device
->host
->sg_tablesize
;
294 if ((sfp
= sg_add_sfp(sdp
, dev
)))
295 filp
->private_data
= sfp
;
298 sdp
->exclude
= 0; /* undo if error */
305 scsi_device_put(sdp
->device
);
309 /* Following function was formerly called 'sg_close' */
311 sg_release(struct inode
*inode
, struct file
*filp
)
316 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
318 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp
->disk
->disk_name
));
319 sg_fasync(-1, filp
, 0); /* remove filp from async notification list */
320 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* Returns 1 when sdp gone */
321 if (!sdp
->detached
) {
322 scsi_device_put(sdp
->device
);
325 wake_up_interruptible(&sdp
->o_excl_wait
);
331 sg_read(struct file
*filp
, char __user
*buf
, size_t count
, loff_t
* ppos
)
337 int req_pack_id
= -1;
338 struct sg_header old_hdr
;
342 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
344 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
345 sdp
->disk
->disk_name
, (int) count
));
346 if (!access_ok(VERIFY_WRITE
, buf
, count
))
348 if (sfp
->force_packid
&& (count
>= SZ_SG_HEADER
)) {
349 if (__copy_from_user(&old_hdr
, buf
, SZ_SG_HEADER
))
351 if (old_hdr
.reply_len
< 0) {
352 if (count
>= SZ_SG_IO_HDR
) {
354 (&new_hdr
, buf
, SZ_SG_IO_HDR
))
356 req_pack_id
= new_hdr
.pack_id
;
359 req_pack_id
= old_hdr
.pack_id
;
361 srp
= sg_get_rq_mark(sfp
, req_pack_id
);
362 if (!srp
) { /* now wait on packet to arrive */
365 if (filp
->f_flags
& O_NONBLOCK
)
368 res
= 0; /* following is a macro that beats race condition */
369 __wait_event_interruptible(sfp
->read_wait
,
370 (sdp
->detached
|| (srp
= sg_get_rq_mark(sfp
, req_pack_id
))),
376 return res
; /* -ERESTARTSYS because signal hit process */
379 if (srp
->header
.interface_id
!= '\0')
380 return sg_new_read(sfp
, buf
, count
, srp
);
383 memset(&old_hdr
, 0, SZ_SG_HEADER
);
384 old_hdr
.reply_len
= (int) hp
->timeout
;
385 old_hdr
.pack_len
= old_hdr
.reply_len
; /* very old, strange behaviour */
386 old_hdr
.pack_id
= hp
->pack_id
;
387 old_hdr
.twelve_byte
=
388 ((srp
->data
.cmd_opcode
>= 0xc0) && (12 == hp
->cmd_len
)) ? 1 : 0;
389 old_hdr
.target_status
= hp
->masked_status
;
390 old_hdr
.host_status
= hp
->host_status
;
391 old_hdr
.driver_status
= hp
->driver_status
;
392 if ((CHECK_CONDITION
& hp
->masked_status
) ||
393 (DRIVER_SENSE
& hp
->driver_status
))
394 memcpy(old_hdr
.sense_buffer
, srp
->sense_b
,
395 sizeof (old_hdr
.sense_buffer
));
396 switch (hp
->host_status
) {
397 /* This setup of 'result' is for backward compatibility and is best
398 ignored by the user who should use target, host + driver status */
400 case DID_PASSTHROUGH
:
407 old_hdr
.result
= EBUSY
;
414 old_hdr
.result
= EIO
;
417 old_hdr
.result
= (srp
->sense_b
[0] == 0 &&
418 hp
->masked_status
== GOOD
) ? 0 : EIO
;
421 old_hdr
.result
= EIO
;
425 /* Now copy the result back to the user buffer. */
426 if (count
>= SZ_SG_HEADER
) {
427 if (__copy_to_user(buf
, &old_hdr
, SZ_SG_HEADER
))
430 if (count
> old_hdr
.reply_len
)
431 count
= old_hdr
.reply_len
;
432 if (count
> SZ_SG_HEADER
) {
434 sg_read_oxfer(srp
, buf
, count
- SZ_SG_HEADER
)))
438 count
= (old_hdr
.result
== 0) ? 0 : -EIO
;
439 sg_finish_rem_req(srp
);
444 sg_new_read(Sg_fd
* sfp
, char __user
*buf
, size_t count
, Sg_request
* srp
)
446 sg_io_hdr_t
*hp
= &srp
->header
;
450 if (count
< SZ_SG_IO_HDR
) {
455 if ((hp
->mx_sb_len
> 0) && hp
->sbp
) {
456 if ((CHECK_CONDITION
& hp
->masked_status
) ||
457 (DRIVER_SENSE
& hp
->driver_status
)) {
458 int sb_len
= sizeof (dummy_cmdp
->sr_sense_buffer
);
459 sb_len
= (hp
->mx_sb_len
> sb_len
) ? sb_len
: hp
->mx_sb_len
;
460 len
= 8 + (int) srp
->sense_b
[7]; /* Additional sense length field */
461 len
= (len
> sb_len
) ? sb_len
: len
;
462 if (copy_to_user(hp
->sbp
, srp
->sense_b
, len
)) {
469 if (hp
->masked_status
|| hp
->host_status
|| hp
->driver_status
)
470 hp
->info
|= SG_INFO_CHECK
;
471 if (copy_to_user(buf
, hp
, SZ_SG_IO_HDR
)) {
475 err
= sg_read_xfer(srp
);
477 sg_finish_rem_req(srp
);
478 return (0 == err
) ? count
: err
;
482 sg_write(struct file
*filp
, const char __user
*buf
, size_t count
, loff_t
* ppos
)
484 int mxsize
, cmd_size
, k
;
485 int input_size
, blocking
;
486 unsigned char opcode
;
490 struct sg_header old_hdr
;
492 unsigned char cmnd
[sizeof (dummy_cmdp
->sr_cmnd
)];
494 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
496 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
497 sdp
->disk
->disk_name
, (int) count
));
500 if (!((filp
->f_flags
& O_NONBLOCK
) ||
501 scsi_block_when_processing_errors(sdp
->device
)))
504 if (!access_ok(VERIFY_READ
, buf
, count
))
505 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
506 if (count
< SZ_SG_HEADER
)
508 if (__copy_from_user(&old_hdr
, buf
, SZ_SG_HEADER
))
510 blocking
= !(filp
->f_flags
& O_NONBLOCK
);
511 if (old_hdr
.reply_len
< 0)
512 return sg_new_write(sfp
, buf
, count
, blocking
, 0, NULL
);
513 if (count
< (SZ_SG_HEADER
+ 6))
514 return -EIO
; /* The minimum scsi command length is 6 bytes. */
516 if (!(srp
= sg_add_request(sfp
))) {
517 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
521 __get_user(opcode
, buf
);
522 if (sfp
->next_cmd_len
> 0) {
523 if (sfp
->next_cmd_len
> MAX_COMMAND_SIZE
) {
524 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
525 sfp
->next_cmd_len
= 0;
526 sg_remove_request(sfp
, srp
);
529 cmd_size
= sfp
->next_cmd_len
;
530 sfp
->next_cmd_len
= 0; /* reset so only this write() effected */
532 cmd_size
= COMMAND_SIZE(opcode
); /* based on SCSI command group */
533 if ((opcode
>= 0xc0) && old_hdr
.twelve_byte
)
536 SCSI_LOG_TIMEOUT(4, printk(
537 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode
, cmd_size
));
538 /* Determine buffer size. */
539 input_size
= count
- cmd_size
;
540 mxsize
= (input_size
> old_hdr
.reply_len
) ? input_size
: old_hdr
.reply_len
;
541 mxsize
-= SZ_SG_HEADER
;
542 input_size
-= SZ_SG_HEADER
;
543 if (input_size
< 0) {
544 sg_remove_request(sfp
, srp
);
545 return -EIO
; /* User did not pass enough bytes for this command. */
548 hp
->interface_id
= '\0'; /* indicator of old interface tunnelled */
549 hp
->cmd_len
= (unsigned char) cmd_size
;
553 hp
->dxfer_direction
= (old_hdr
.reply_len
> SZ_SG_HEADER
) ?
554 SG_DXFER_TO_FROM_DEV
: SG_DXFER_TO_DEV
;
556 hp
->dxfer_direction
= (mxsize
> 0) ? SG_DXFER_FROM_DEV
: SG_DXFER_NONE
;
557 hp
->dxfer_len
= mxsize
;
558 hp
->dxferp
= (char __user
*)buf
+ cmd_size
;
560 hp
->timeout
= old_hdr
.reply_len
; /* structure abuse ... */
561 hp
->flags
= input_size
; /* structure abuse ... */
562 hp
->pack_id
= old_hdr
.pack_id
;
564 if (__copy_from_user(cmnd
, buf
, cmd_size
))
567 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
568 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
569 * is a non-zero input_size, so emit a warning.
571 if (hp
->dxfer_direction
== SG_DXFER_TO_FROM_DEV
)
572 if (printk_ratelimit())
574 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
575 "guessing data in;\n" KERN_WARNING
" "
576 "program %s not setting count and/or reply_len properly\n",
577 old_hdr
.reply_len
- (int)SZ_SG_HEADER
,
578 input_size
, (unsigned int) cmnd
[0],
580 k
= sg_common_write(sfp
, srp
, cmnd
, sfp
->timeout
, blocking
);
581 return (k
< 0) ? k
: count
;
585 sg_new_write(Sg_fd
* sfp
, const char __user
*buf
, size_t count
,
586 int blocking
, int read_only
, Sg_request
** o_srp
)
591 unsigned char cmnd
[sizeof (dummy_cmdp
->sr_cmnd
)];
593 unsigned long ul_timeout
;
595 if (count
< SZ_SG_IO_HDR
)
597 if (!access_ok(VERIFY_READ
, buf
, count
))
598 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
600 sfp
->cmd_q
= 1; /* when sg_io_hdr seen, set command queuing on */
601 if (!(srp
= sg_add_request(sfp
))) {
602 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
606 if (__copy_from_user(hp
, buf
, SZ_SG_IO_HDR
)) {
607 sg_remove_request(sfp
, srp
);
610 if (hp
->interface_id
!= 'S') {
611 sg_remove_request(sfp
, srp
);
614 if (hp
->flags
& SG_FLAG_MMAP_IO
) {
615 if (hp
->dxfer_len
> sfp
->reserve
.bufflen
) {
616 sg_remove_request(sfp
, srp
);
617 return -ENOMEM
; /* MMAP_IO size must fit in reserve buffer */
619 if (hp
->flags
& SG_FLAG_DIRECT_IO
) {
620 sg_remove_request(sfp
, srp
);
621 return -EINVAL
; /* either MMAP_IO or DIRECT_IO (not both) */
623 if (sg_res_in_use(sfp
)) {
624 sg_remove_request(sfp
, srp
);
625 return -EBUSY
; /* reserve buffer already being used */
628 ul_timeout
= msecs_to_jiffies(srp
->header
.timeout
);
629 timeout
= (ul_timeout
< INT_MAX
) ? ul_timeout
: INT_MAX
;
630 if ((!hp
->cmdp
) || (hp
->cmd_len
< 6) || (hp
->cmd_len
> sizeof (cmnd
))) {
631 sg_remove_request(sfp
, srp
);
634 if (!access_ok(VERIFY_READ
, hp
->cmdp
, hp
->cmd_len
)) {
635 sg_remove_request(sfp
, srp
);
636 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
638 if (__copy_from_user(cmnd
, hp
->cmdp
, hp
->cmd_len
)) {
639 sg_remove_request(sfp
, srp
);
643 (!sg_allow_access(cmnd
[0], sfp
->parentdp
->device
->type
))) {
644 sg_remove_request(sfp
, srp
);
647 k
= sg_common_write(sfp
, srp
, cmnd
, timeout
, blocking
);
656 sg_common_write(Sg_fd
* sfp
, Sg_request
* srp
,
657 unsigned char *cmnd
, int timeout
, int blocking
)
661 Sg_device
*sdp
= sfp
->parentdp
;
662 sg_io_hdr_t
*hp
= &srp
->header
;
665 srp
->data
.cmd_opcode
= cmnd
[0]; /* hold opcode of command */
667 hp
->masked_status
= 0;
671 hp
->driver_status
= 0;
673 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
674 (int) cmnd
[0], (int) hp
->cmd_len
));
676 if ((k
= sg_start_req(srp
))) {
677 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k
));
678 sg_finish_rem_req(srp
);
679 return k
; /* probably out of space --> ENOMEM */
681 if ((k
= sg_write_xfer(srp
))) {
682 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
683 sg_finish_rem_req(srp
);
687 sg_finish_rem_req(srp
);
690 SRpnt
= scsi_allocate_request(sdp
->device
, GFP_ATOMIC
);
692 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
693 sg_finish_rem_req(srp
);
697 srp
->my_cmdp
= SRpnt
;
698 q
= SRpnt
->sr_device
->request_queue
;
699 SRpnt
->sr_request
->rq_disk
= sdp
->disk
;
700 SRpnt
->sr_sense_buffer
[0] = 0;
701 SRpnt
->sr_cmd_len
= hp
->cmd_len
;
702 SRpnt
->sr_use_sg
= srp
->data
.k_use_sg
;
703 SRpnt
->sr_sglist_len
= srp
->data
.sglist_len
;
704 SRpnt
->sr_bufflen
= srp
->data
.bufflen
;
705 SRpnt
->sr_underflow
= 0;
706 SRpnt
->sr_buffer
= srp
->data
.buffer
;
707 switch (hp
->dxfer_direction
) {
708 case SG_DXFER_TO_FROM_DEV
:
709 case SG_DXFER_FROM_DEV
:
710 SRpnt
->sr_data_direction
= SCSI_DATA_READ
;
712 case SG_DXFER_TO_DEV
:
713 SRpnt
->sr_data_direction
= SCSI_DATA_WRITE
;
715 case SG_DXFER_UNKNOWN
:
716 SRpnt
->sr_data_direction
= SCSI_DATA_UNKNOWN
;
719 SRpnt
->sr_data_direction
= SCSI_DATA_NONE
;
722 SRpnt
->upper_private_data
= srp
;
723 srp
->data
.k_use_sg
= 0;
724 srp
->data
.sglist_len
= 0;
725 srp
->data
.bufflen
= 0;
726 srp
->data
.buffer
= NULL
;
727 hp
->duration
= jiffies
; /* unit jiffies now, millisecs after done */
728 /* Now send everything of to mid-level. The next time we hear about this
729 packet is when sg_cmd_done() is called (i.e. a callback). */
730 scsi_do_req(SRpnt
, (void *) cmnd
,
731 (void *) SRpnt
->sr_buffer
, hp
->dxfer_len
,
732 sg_cmd_done
, timeout
, SG_DEFAULT_RETRIES
);
733 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
738 sg_srp_done(Sg_request
*srp
, Sg_fd
*sfp
)
740 unsigned long iflags
;
743 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
745 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
750 sg_ioctl(struct inode
*inode
, struct file
*filp
,
751 unsigned int cmd_in
, unsigned long arg
)
753 void __user
*p
= (void __user
*)arg
;
755 int result
, val
, read_only
;
759 unsigned long iflags
;
761 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
763 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
764 sdp
->disk
->disk_name
, (int) cmd_in
));
765 read_only
= (O_RDWR
!= (filp
->f_flags
& O_ACCMODE
));
770 int blocking
= 1; /* ignore O_NONBLOCK flag */
774 if (!scsi_block_when_processing_errors(sdp
->device
))
776 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_IO_HDR
))
779 sg_new_write(sfp
, p
, SZ_SG_IO_HDR
,
780 blocking
, read_only
, &srp
);
783 srp
->sg_io_owned
= 1;
785 result
= 0; /* following macro to beat race condition */
786 __wait_event_interruptible(sfp
->read_wait
,
787 (sdp
->detached
|| sfp
->closed
|| sg_srp_done(srp
, sfp
)),
792 return 0; /* request packet dropped already */
796 return result
; /* -ERESTARTSYS because signal hit process */
798 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
800 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
801 result
= sg_new_read(sfp
, p
, SZ_SG_IO_HDR
, srp
);
802 return (result
< 0) ? result
: 0;
805 result
= get_user(val
, ip
);
810 if (val
>= MULDIV (INT_MAX
, USER_HZ
, HZ
))
811 val
= MULDIV (INT_MAX
, USER_HZ
, HZ
);
812 sfp
->timeout_user
= val
;
813 sfp
->timeout
= MULDIV (val
, HZ
, USER_HZ
);
816 case SG_GET_TIMEOUT
: /* N.B. User receives timeout as return value */
817 /* strange ..., for backward compatibility */
818 return sfp
->timeout_user
;
819 case SG_SET_FORCE_LOW_DMA
:
820 result
= get_user(val
, ip
);
825 if ((0 == sfp
->low_dma
) && (0 == sg_res_in_use(sfp
))) {
826 val
= (int) sfp
->reserve
.bufflen
;
827 sg_remove_scat(&sfp
->reserve
);
828 sg_build_reserve(sfp
, val
);
833 sfp
->low_dma
= sdp
->device
->host
->unchecked_isa_dma
;
837 return put_user((int) sfp
->low_dma
, ip
);
839 if (!access_ok(VERIFY_WRITE
, p
, sizeof (sg_scsi_id_t
)))
842 sg_scsi_id_t __user
*sg_idp
= p
;
846 __put_user((int) sdp
->device
->host
->host_no
,
848 __put_user((int) sdp
->device
->channel
,
850 __put_user((int) sdp
->device
->id
, &sg_idp
->scsi_id
);
851 __put_user((int) sdp
->device
->lun
, &sg_idp
->lun
);
852 __put_user((int) sdp
->device
->type
, &sg_idp
->scsi_type
);
853 __put_user((short) sdp
->device
->host
->cmd_per_lun
,
854 &sg_idp
->h_cmd_per_lun
);
855 __put_user((short) sdp
->device
->queue_depth
,
856 &sg_idp
->d_queue_depth
);
857 __put_user(0, &sg_idp
->unused
[0]);
858 __put_user(0, &sg_idp
->unused
[1]);
861 case SG_SET_FORCE_PACK_ID
:
862 result
= get_user(val
, ip
);
865 sfp
->force_packid
= val
? 1 : 0;
868 if (!access_ok(VERIFY_WRITE
, ip
, sizeof (int)))
870 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
871 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
872 if ((1 == srp
->done
) && (!srp
->sg_io_owned
)) {
873 read_unlock_irqrestore(&sfp
->rq_list_lock
,
875 __put_user(srp
->header
.pack_id
, ip
);
879 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
882 case SG_GET_NUM_WAITING
:
883 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
884 for (val
= 0, srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
885 if ((1 == srp
->done
) && (!srp
->sg_io_owned
))
888 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
889 return put_user(val
, ip
);
890 case SG_GET_SG_TABLESIZE
:
891 return put_user(sdp
->sg_tablesize
, ip
);
892 case SG_SET_RESERVED_SIZE
:
893 result
= get_user(val
, ip
);
898 if (val
!= sfp
->reserve
.bufflen
) {
899 if (sg_res_in_use(sfp
) || sfp
->mmap_called
)
901 sg_remove_scat(&sfp
->reserve
);
902 sg_build_reserve(sfp
, val
);
905 case SG_GET_RESERVED_SIZE
:
906 val
= (int) sfp
->reserve
.bufflen
;
907 return put_user(val
, ip
);
908 case SG_SET_COMMAND_Q
:
909 result
= get_user(val
, ip
);
912 sfp
->cmd_q
= val
? 1 : 0;
914 case SG_GET_COMMAND_Q
:
915 return put_user((int) sfp
->cmd_q
, ip
);
916 case SG_SET_KEEP_ORPHAN
:
917 result
= get_user(val
, ip
);
920 sfp
->keep_orphan
= val
;
922 case SG_GET_KEEP_ORPHAN
:
923 return put_user((int) sfp
->keep_orphan
, ip
);
924 case SG_NEXT_CMD_LEN
:
925 result
= get_user(val
, ip
);
928 sfp
->next_cmd_len
= (val
> 0) ? val
: 0;
930 case SG_GET_VERSION_NUM
:
931 return put_user(sg_version_num
, ip
);
932 case SG_GET_ACCESS_COUNT
:
933 /* faked - we don't have a real access count anymore */
934 val
= (sdp
->device
? 1 : 0);
935 return put_user(val
, ip
);
936 case SG_GET_REQUEST_TABLE
:
937 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_REQ_INFO
* SG_MAX_QUEUE
))
940 sg_req_info_t rinfo
[SG_MAX_QUEUE
];
942 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
943 for (srp
= sfp
->headrp
, val
= 0; val
< SG_MAX_QUEUE
;
944 ++val
, srp
= srp
? srp
->nextrp
: srp
) {
945 memset(&rinfo
[val
], 0, SZ_SG_REQ_INFO
);
947 rinfo
[val
].req_state
= srp
->done
+ 1;
949 srp
->header
.masked_status
&
950 srp
->header
.host_status
&
951 srp
->header
.driver_status
;
952 rinfo
[val
].duration
=
953 srp
->done
? srp
->header
.duration
:
955 jiffies
- srp
->header
.duration
);
956 rinfo
[val
].orphan
= srp
->orphan
;
957 rinfo
[val
].sg_io_owned
= srp
->sg_io_owned
;
958 rinfo
[val
].pack_id
= srp
->header
.pack_id
;
959 rinfo
[val
].usr_ptr
= srp
->header
.usr_ptr
;
962 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
963 return (__copy_to_user(p
, rinfo
,
964 SZ_SG_REQ_INFO
* SG_MAX_QUEUE
) ? -EFAULT
: 0);
966 case SG_EMULATED_HOST
:
969 return put_user(sdp
->device
->host
->hostt
->emulated
, ip
);
973 if (filp
->f_flags
& O_NONBLOCK
) {
974 if (test_bit(SHOST_RECOVERY
,
975 &sdp
->device
->host
->shost_state
))
977 } else if (!scsi_block_when_processing_errors(sdp
->device
))
979 result
= get_user(val
, ip
);
982 if (SG_SCSI_RESET_NOTHING
== val
)
985 case SG_SCSI_RESET_DEVICE
:
986 val
= SCSI_TRY_RESET_DEVICE
;
988 case SG_SCSI_RESET_BUS
:
989 val
= SCSI_TRY_RESET_BUS
;
991 case SG_SCSI_RESET_HOST
:
992 val
= SCSI_TRY_RESET_HOST
;
997 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
999 return (scsi_reset_provider(sdp
->device
, val
) ==
1000 SUCCESS
) ? 0 : -EIO
;
1001 case SCSI_IOCTL_SEND_COMMAND
:
1005 unsigned char opcode
= WRITE_6
;
1006 Scsi_Ioctl_Command __user
*siocp
= p
;
1008 if (copy_from_user(&opcode
, siocp
->data
, 1))
1010 if (!sg_allow_access(opcode
, sdp
->device
->type
))
1013 return scsi_ioctl_send_command(sdp
->device
, p
);
1015 result
= get_user(val
, ip
);
1018 sdp
->sgdebug
= (char) val
;
1020 case SCSI_IOCTL_GET_IDLUN
:
1021 case SCSI_IOCTL_GET_BUS_NUMBER
:
1022 case SCSI_IOCTL_PROBE_HOST
:
1023 case SG_GET_TRANSFORM
:
1026 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1029 return -EPERM
; /* don't know so take safe approach */
1030 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1034 #ifdef CONFIG_COMPAT
1035 static long sg_compat_ioctl(struct file
*filp
, unsigned int cmd_in
, unsigned long arg
)
1039 struct scsi_device
*sdev
;
1041 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1045 if (sdev
->host
->hostt
->compat_ioctl
) {
1048 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd_in
, (void __user
*)arg
);
1053 return -ENOIOCTLCMD
;
1058 sg_poll(struct file
*filp
, poll_table
* wait
)
1060 unsigned int res
= 0;
1065 unsigned long iflags
;
1067 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
))
1070 poll_wait(filp
, &sfp
->read_wait
, wait
);
1071 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1072 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
1073 /* if any read waiting, flag it */
1074 if ((0 == res
) && (1 == srp
->done
) && (!srp
->sg_io_owned
))
1075 res
= POLLIN
| POLLRDNORM
;
1078 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1082 else if (!sfp
->cmd_q
) {
1084 res
|= POLLOUT
| POLLWRNORM
;
1085 } else if (count
< SG_MAX_QUEUE
)
1086 res
|= POLLOUT
| POLLWRNORM
;
1087 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1088 sdp
->disk
->disk_name
, (int) res
));
1093 sg_fasync(int fd
, struct file
*filp
, int mode
)
1099 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1101 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1102 sdp
->disk
->disk_name
, mode
));
1104 retval
= fasync_helper(fd
, filp
, mode
, &sfp
->async_qp
);
1105 return (retval
< 0) ? retval
: 0;
1108 static inline unsigned char *
1109 sg_scatg2virt(const struct scatterlist
*sclp
)
1111 return (sclp
&& sclp
->page
) ?
1112 (unsigned char *) page_address(sclp
->page
) + sclp
->offset
: NULL
;
1115 /* When startFinish==1 increments page counts for pages other than the
1116 first of scatter gather elements obtained from __get_free_pages().
1117 When startFinish==0 decrements ... */
1119 sg_rb_correct4mmap(Sg_scatter_hold
* rsv_schp
, int startFinish
)
1125 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1126 startFinish
, rsv_schp
->k_use_sg
));
1127 /* N.B. correction _not_ applied to base page of each allocation */
1128 if (rsv_schp
->k_use_sg
) { /* reserve buffer is a scatter gather list */
1129 struct scatterlist
*sclp
= rsv_schp
->buffer
;
1131 for (k
= 0; k
< rsv_schp
->k_use_sg
; ++k
, ++sclp
) {
1132 for (m
= PAGE_SIZE
; m
< sclp
->length
; m
+= PAGE_SIZE
) {
1133 page_ptr
= sg_scatg2virt(sclp
) + m
;
1134 page
= virt_to_page(page_ptr
);
1138 if (page_count(page
) > 0)
1143 } else { /* reserve buffer is just a single allocation */
1144 for (m
= PAGE_SIZE
; m
< rsv_schp
->bufflen
; m
+= PAGE_SIZE
) {
1145 page_ptr
= (unsigned char *) rsv_schp
->buffer
+ m
;
1146 page
= virt_to_page(page_ptr
);
1150 if (page_count(page
) > 0)
1157 static struct page
*
1158 sg_vma_nopage(struct vm_area_struct
*vma
, unsigned long addr
, int *type
)
1161 struct page
*page
= NOPAGE_SIGBUS
;
1162 void *page_ptr
= NULL
;
1163 unsigned long offset
;
1164 Sg_scatter_hold
*rsv_schp
;
1166 if ((NULL
== vma
) || (!(sfp
= (Sg_fd
*) vma
->vm_private_data
)))
1168 rsv_schp
= &sfp
->reserve
;
1169 offset
= addr
- vma
->vm_start
;
1170 if (offset
>= rsv_schp
->bufflen
)
1172 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1173 offset
, rsv_schp
->k_use_sg
));
1174 if (rsv_schp
->k_use_sg
) { /* reserve buffer is a scatter gather list */
1176 unsigned long sa
= vma
->vm_start
;
1178 struct scatterlist
*sclp
= rsv_schp
->buffer
;
1180 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1182 len
= vma
->vm_end
- sa
;
1183 len
= (len
< sclp
->length
) ? len
: sclp
->length
;
1185 page_ptr
= sg_scatg2virt(sclp
) + offset
;
1186 page
= virt_to_page(page_ptr
);
1187 get_page(page
); /* increment page count */
1193 } else { /* reserve buffer is just a single allocation */
1194 page_ptr
= (unsigned char *) rsv_schp
->buffer
+ offset
;
1195 page
= virt_to_page(page_ptr
);
1196 get_page(page
); /* increment page count */
1199 *type
= VM_FAULT_MINOR
;
1203 static struct vm_operations_struct sg_mmap_vm_ops
= {
1204 .nopage
= sg_vma_nopage
,
1208 sg_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
1211 unsigned long req_sz
= vma
->vm_end
- vma
->vm_start
;
1212 Sg_scatter_hold
*rsv_schp
;
1214 if ((!filp
) || (!vma
) || (!(sfp
= (Sg_fd
*) filp
->private_data
)))
1216 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1217 (void *) vma
->vm_start
, (int) req_sz
));
1219 return -EINVAL
; /* want no offset */
1220 rsv_schp
= &sfp
->reserve
;
1221 if (req_sz
> rsv_schp
->bufflen
)
1222 return -ENOMEM
; /* cannot map more than reserved buffer */
1224 if (rsv_schp
->k_use_sg
) { /* reserve buffer is a scatter gather list */
1226 unsigned long sa
= vma
->vm_start
;
1228 struct scatterlist
*sclp
= rsv_schp
->buffer
;
1230 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1232 if (0 != sclp
->offset
)
1233 return -EFAULT
; /* non page aligned memory ?? */
1234 len
= vma
->vm_end
- sa
;
1235 len
= (len
< sclp
->length
) ? len
: sclp
->length
;
1238 } else { /* reserve buffer is just a single allocation */
1239 if ((unsigned long) rsv_schp
->buffer
& (PAGE_SIZE
- 1))
1240 return -EFAULT
; /* non page aligned memory ?? */
1242 if (0 == sfp
->mmap_called
) {
1243 sg_rb_correct4mmap(rsv_schp
, 1); /* do only once per fd lifetime */
1244 sfp
->mmap_called
= 1;
1246 vma
->vm_flags
|= (VM_RESERVED
| VM_IO
);
1247 vma
->vm_private_data
= sfp
;
1248 vma
->vm_ops
= &sg_mmap_vm_ops
;
1252 /* This function is a "bottom half" handler that is called by the
1253 * mid level when a command is completed (or has failed). */
1255 sg_cmd_done(Scsi_Cmnd
* SCpnt
)
1257 Scsi_Request
*SRpnt
= NULL
;
1258 Sg_device
*sdp
= NULL
;
1260 Sg_request
*srp
= NULL
;
1261 unsigned long iflags
;
1263 if (SCpnt
&& (SRpnt
= SCpnt
->sc_request
))
1264 srp
= (Sg_request
*) SRpnt
->upper_private_data
;
1266 printk(KERN_ERR
"sg_cmd_done: NULL request\n");
1268 scsi_release_request(SRpnt
);
1271 sfp
= srp
->parentfp
;
1273 sdp
= sfp
->parentdp
;
1274 if ((NULL
== sdp
) || sdp
->detached
) {
1275 printk(KERN_INFO
"sg_cmd_done: device detached\n");
1276 scsi_release_request(SRpnt
);
1280 /* First transfer ownership of data buffers to sg_device object. */
1281 srp
->data
.k_use_sg
= SRpnt
->sr_use_sg
;
1282 srp
->data
.sglist_len
= SRpnt
->sr_sglist_len
;
1283 srp
->data
.bufflen
= SRpnt
->sr_bufflen
;
1284 srp
->data
.buffer
= SRpnt
->sr_buffer
;
1285 /* now clear out request structure */
1286 SRpnt
->sr_use_sg
= 0;
1287 SRpnt
->sr_sglist_len
= 0;
1288 SRpnt
->sr_bufflen
= 0;
1289 SRpnt
->sr_buffer
= NULL
;
1290 SRpnt
->sr_underflow
= 0;
1291 SRpnt
->sr_request
->rq_disk
= NULL
; /* "sg" _disowns_ request blk */
1293 srp
->my_cmdp
= NULL
;
1295 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1296 sdp
->disk
->disk_name
, srp
->header
.pack_id
, (int) SRpnt
->sr_result
));
1297 srp
->header
.resid
= SCpnt
->resid
;
1298 /* N.B. unit of duration changes here from jiffies to millisecs */
1299 srp
->header
.duration
=
1300 jiffies_to_msecs(jiffies
- srp
->header
.duration
);
1301 if (0 != SRpnt
->sr_result
) {
1302 struct scsi_sense_hdr sshdr
;
1304 memcpy(srp
->sense_b
, SRpnt
->sr_sense_buffer
,
1305 sizeof (srp
->sense_b
));
1306 srp
->header
.status
= 0xff & SRpnt
->sr_result
;
1307 srp
->header
.masked_status
= status_byte(SRpnt
->sr_result
);
1308 srp
->header
.msg_status
= msg_byte(SRpnt
->sr_result
);
1309 srp
->header
.host_status
= host_byte(SRpnt
->sr_result
);
1310 srp
->header
.driver_status
= driver_byte(SRpnt
->sr_result
);
1311 if ((sdp
->sgdebug
> 0) &&
1312 ((CHECK_CONDITION
== srp
->header
.masked_status
) ||
1313 (COMMAND_TERMINATED
== srp
->header
.masked_status
)))
1314 print_req_sense("sg_cmd_done", SRpnt
);
1316 /* Following if statement is a patch supplied by Eric Youngdale */
1317 if (driver_byte(SRpnt
->sr_result
) != 0
1318 && scsi_command_normalize_sense(SCpnt
, &sshdr
)
1319 && !scsi_sense_is_deferred(&sshdr
)
1320 && sshdr
.sense_key
== UNIT_ATTENTION
1321 && sdp
->device
->removable
) {
1322 /* Detected possible disc change. Set the bit - this */
1323 /* may be used if there are filesystems using this device */
1324 sdp
->device
->changed
= 1;
1327 /* Rely on write phase to clean out srp status values, so no "else" */
1329 scsi_release_request(SRpnt
);
1331 if (sfp
->closed
) { /* whoops this fd already released, cleanup */
1332 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1333 sg_finish_rem_req(srp
);
1335 if (NULL
== sfp
->headrp
) {
1336 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1337 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* device still present */
1338 scsi_device_put(sdp
->device
);
1342 } else if (srp
&& srp
->orphan
) {
1343 if (sfp
->keep_orphan
)
1344 srp
->sg_io_owned
= 0;
1346 sg_finish_rem_req(srp
);
1351 /* Now wake up any sg_read() that is waiting for this packet. */
1352 kill_fasync(&sfp
->async_qp
, SIGPOLL
, POLL_IN
);
1353 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1355 wake_up_interruptible(&sfp
->read_wait
);
1356 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1360 static struct file_operations sg_fops
= {
1361 .owner
= THIS_MODULE
,
1366 #ifdef CONFIG_COMPAT
1367 .compat_ioctl
= sg_compat_ioctl
,
1371 .release
= sg_release
,
1372 .fasync
= sg_fasync
,
1375 static struct class_simple
* sg_sysfs_class
;
1377 static int sg_sysfs_valid
= 0;
1379 static int sg_alloc(struct gendisk
*disk
, struct scsi_device
*scsidp
)
1382 unsigned long iflags
;
1383 void *old_sg_dev_arr
= NULL
;
1386 sdp
= kmalloc(sizeof(Sg_device
), GFP_KERNEL
);
1388 printk(KERN_WARNING
"kmalloc Sg_device failure\n");
1392 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
1393 if (unlikely(sg_nr_dev
>= sg_dev_max
)) { /* try to resize */
1395 int tmp_dev_max
= sg_nr_dev
+ SG_DEV_ARR_LUMP
;
1396 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1398 tmp_da
= kmalloc(tmp_dev_max
* sizeof(Sg_device
*), GFP_KERNEL
);
1399 if (unlikely(!tmp_da
))
1402 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
1403 memset(tmp_da
, 0, tmp_dev_max
* sizeof(Sg_device
*));
1404 memcpy(tmp_da
, sg_dev_arr
, sg_dev_max
* sizeof(Sg_device
*));
1405 old_sg_dev_arr
= sg_dev_arr
;
1406 sg_dev_arr
= tmp_da
;
1407 sg_dev_max
= tmp_dev_max
;
1410 for (k
= 0; k
< sg_dev_max
; k
++)
1413 if (unlikely(k
>= SG_MAX_DEVS
))
1416 memset(sdp
, 0, sizeof(*sdp
));
1417 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k
));
1418 sprintf(disk
->disk_name
, "sg%d", k
);
1419 disk
->first_minor
= k
;
1421 sdp
->device
= scsidp
;
1422 init_waitqueue_head(&sdp
->o_excl_wait
);
1423 sdp
->sg_tablesize
= scsidp
->host
? scsidp
->host
->sg_tablesize
: 0;
1426 sg_dev_arr
[k
] = sdp
;
1427 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1433 kfree(old_sg_dev_arr
);
1437 printk(KERN_WARNING
"sg_alloc: device array cannot be resized\n");
1442 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1444 "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
1445 "number exceeds %d\n", scsidp
->host
->host_no
, scsidp
->channel
,
1446 scsidp
->id
, scsidp
->lun
, scsidp
->type
, SG_MAX_DEVS
- 1);
1452 sg_add(struct class_device
*cl_dev
)
1454 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->dev
);
1455 struct gendisk
*disk
;
1456 Sg_device
*sdp
= NULL
;
1457 struct cdev
* cdev
= NULL
;
1460 disk
= alloc_disk(1);
1462 printk(KERN_WARNING
"alloc_disk failed\n");
1465 disk
->major
= SCSI_GENERIC_MAJOR
;
1468 cdev
= cdev_alloc();
1470 printk(KERN_WARNING
"cdev_alloc failed\n");
1473 cdev
->owner
= THIS_MODULE
;
1474 cdev
->ops
= &sg_fops
;
1476 error
= sg_alloc(disk
, scsidp
);
1478 printk(KERN_WARNING
"sg_alloc failed\n");
1482 sdp
= sg_dev_arr
[k
];
1484 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR
, k
),
1485 S_IFCHR
| S_IRUSR
| S_IWUSR
| S_IRGRP
,
1486 "%s/generic", scsidp
->devfs_name
);
1487 error
= cdev_add(cdev
, MKDEV(SCSI_GENERIC_MAJOR
, k
), 1);
1489 devfs_remove("%s/generic", scsidp
->devfs_name
);
1493 if (sg_sysfs_valid
) {
1494 struct class_device
* sg_class_member
;
1496 sg_class_member
= class_simple_device_add(sg_sysfs_class
,
1497 MKDEV(SCSI_GENERIC_MAJOR
, k
),
1500 if (IS_ERR(sg_class_member
))
1501 printk(KERN_WARNING
"sg_add: "
1502 "class_simple_device_add failed\n");
1503 class_set_devdata(sg_class_member
, sdp
);
1504 error
= sysfs_create_link(&scsidp
->sdev_gendev
.kobj
,
1505 &sg_class_member
->kobj
, "generic");
1507 printk(KERN_ERR
"sg_add: unable to make symlink "
1508 "'generic' back to sg%d\n", k
);
1510 printk(KERN_WARNING
"sg_add: sg_sys INvalid\n");
1513 "Attached scsi generic sg%d at scsi%d, channel"
1514 " %d, id %d, lun %d, type %d\n", k
,
1515 scsidp
->host
->host_no
, scsidp
->channel
, scsidp
->id
,
1516 scsidp
->lun
, scsidp
->type
);
1528 sg_remove(struct class_device
*cl_dev
)
1530 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->dev
);
1531 Sg_device
*sdp
= NULL
;
1532 unsigned long iflags
;
1539 if (NULL
== sg_dev_arr
)
1542 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
1543 for (k
= 0; k
< sg_dev_max
; k
++) {
1544 sdp
= sg_dev_arr
[k
];
1545 if ((NULL
== sdp
) || (sdp
->device
!= scsidp
))
1546 continue; /* dirty but lowers nesting */
1549 for (sfp
= sdp
->headfp
; sfp
; sfp
= tsfp
) {
1551 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
1553 if (sfp
->closed
|| (0 == sg_srp_done(srp
, sfp
)))
1554 sg_finish_rem_req(srp
);
1557 scsi_device_put(sdp
->device
);
1558 __sg_remove_sfp(sdp
, sfp
);
1561 wake_up_interruptible(&sfp
->read_wait
);
1562 kill_fasync(&sfp
->async_qp
, SIGPOLL
,
1566 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k
));
1567 if (NULL
== sdp
->headfp
) {
1568 sg_dev_arr
[k
] = NULL
;
1570 } else { /* nothing active, simple case */
1571 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k
));
1572 sg_dev_arr
[k
] = NULL
;
1577 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1580 sysfs_remove_link(&scsidp
->sdev_gendev
.kobj
, "generic");
1581 class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR
, k
));
1582 cdev_del(sdp
->cdev
);
1584 devfs_remove("%s/generic", scsidp
->devfs_name
);
1585 put_disk(sdp
->disk
);
1587 if (NULL
== sdp
->headfp
)
1588 kfree((char *) sdp
);
1592 msleep(10); /* dirty detach so delay device destruction */
1595 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1596 * of sysfs parameters (which module_param doesn't yet support).
1597 * Sysfs parameters defined explicitly below.
1599 module_param_named(def_reserved_size
, def_reserved_size
, int, S_IRUGO
);
1600 module_param_named(allow_dio
, sg_allow_dio
, int, S_IRUGO
| S_IWUSR
);
1602 MODULE_AUTHOR("Douglas Gilbert");
1603 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1604 MODULE_LICENSE("GPL");
1605 MODULE_VERSION(SG_VERSION_STR
);
1607 MODULE_PARM_DESC(def_reserved_size
, "size of buffer reserved for each fd");
1608 MODULE_PARM_DESC(allow_dio
, "allow direct I/O (default: 0 (disallow))");
1615 if (def_reserved_size
>= 0)
1616 sg_big_buff
= def_reserved_size
;
1618 rc
= register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1622 sg_sysfs_class
= class_simple_create(THIS_MODULE
, "scsi_generic");
1623 if ( IS_ERR(sg_sysfs_class
) ) {
1624 rc
= PTR_ERR(sg_sysfs_class
);
1628 rc
= scsi_register_interface(&sg_interface
);
1630 #ifdef CONFIG_SCSI_PROC_FS
1632 #endif /* CONFIG_SCSI_PROC_FS */
1635 class_simple_destroy(sg_sysfs_class
);
1637 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0), SG_MAX_DEVS
);
1644 #ifdef CONFIG_SCSI_PROC_FS
1646 #endif /* CONFIG_SCSI_PROC_FS */
1647 scsi_unregister_interface(&sg_interface
);
1648 class_simple_destroy(sg_sysfs_class
);
1650 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1652 if (sg_dev_arr
!= NULL
) {
1653 kfree((char *) sg_dev_arr
);
1660 sg_start_req(Sg_request
* srp
)
1663 Sg_fd
*sfp
= srp
->parentfp
;
1664 sg_io_hdr_t
*hp
= &srp
->header
;
1665 int dxfer_len
= (int) hp
->dxfer_len
;
1666 int dxfer_dir
= hp
->dxfer_direction
;
1667 Sg_scatter_hold
*req_schp
= &srp
->data
;
1668 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
1670 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len
));
1671 if ((dxfer_len
<= 0) || (dxfer_dir
== SG_DXFER_NONE
))
1673 if (sg_allow_dio
&& (hp
->flags
& SG_FLAG_DIRECT_IO
) &&
1674 (dxfer_dir
!= SG_DXFER_UNKNOWN
) && (0 == hp
->iovec_count
) &&
1675 (!sfp
->parentdp
->device
->host
->unchecked_isa_dma
)) {
1676 res
= sg_build_direct(srp
, sfp
, dxfer_len
);
1677 if (res
<= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1680 if ((!sg_res_in_use(sfp
)) && (dxfer_len
<= rsv_schp
->bufflen
))
1681 sg_link_reserve(sfp
, srp
, dxfer_len
);
1683 res
= sg_build_indirect(req_schp
, sfp
, dxfer_len
);
1685 sg_remove_scat(req_schp
);
1693 sg_finish_rem_req(Sg_request
* srp
)
1695 Sg_fd
*sfp
= srp
->parentfp
;
1696 Sg_scatter_hold
*req_schp
= &srp
->data
;
1698 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp
->res_used
));
1700 sg_unlink_reserve(sfp
, srp
);
1702 sg_remove_scat(req_schp
);
1703 sg_remove_request(sfp
, srp
);
1707 sg_build_sgat(Sg_scatter_hold
* schp
, const Sg_fd
* sfp
, int tablesize
)
1710 int elem_sz
= sizeof (struct scatterlist
);
1711 int sg_bufflen
= tablesize
* elem_sz
;
1712 int mx_sc_elems
= tablesize
;
1714 schp
->buffer
= sg_page_malloc(sg_bufflen
, sfp
->low_dma
, &ret_sz
);
1717 else if (ret_sz
!= sg_bufflen
) {
1718 sg_bufflen
= ret_sz
;
1719 mx_sc_elems
= sg_bufflen
/ elem_sz
;
1721 schp
->sglist_len
= sg_bufflen
;
1722 memset(schp
->buffer
, 0, sg_bufflen
);
1723 return mx_sc_elems
; /* number of scat_gath elements allocated */
1726 #ifdef SG_ALLOW_DIO_CODE
1727 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1728 /* hopefully this generic code will moved to a library */
1730 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1731 - mapping of all pages not successful
1732 - any page is above max_pfn
1733 (i.e., either completely successful or fails)
1736 st_map_user_pages(struct scatterlist
*sgl
, const unsigned int max_pages
,
1737 unsigned long uaddr
, size_t count
, int rw
,
1738 unsigned long max_pfn
)
1741 unsigned int nr_pages
;
1742 struct page
**pages
;
1744 nr_pages
= ((uaddr
& ~PAGE_MASK
) + count
+ ~PAGE_MASK
) >> PAGE_SHIFT
;
1746 /* User attempted Overflow! */
1747 if ((uaddr
+ count
) < uaddr
)
1751 if (nr_pages
> max_pages
)
1758 if ((pages
= kmalloc(max_pages
* sizeof(*pages
), GFP_ATOMIC
)) == NULL
)
1761 /* Try to fault in all of the necessary pages */
1762 down_read(¤t
->mm
->mmap_sem
);
1763 /* rw==READ means read from drive, write into memory area */
1764 res
= get_user_pages(
1770 0, /* don't force */
1773 up_read(¤t
->mm
->mmap_sem
);
1775 /* Errors and no page mapped should return here */
1779 for (i
=0; i
< nr_pages
; i
++) {
1780 /* FIXME: flush superflous for rw==READ,
1781 * probably wrong function for rw==WRITE
1783 flush_dcache_page(pages
[i
]);
1784 if (page_to_pfn(pages
[i
]) > max_pfn
)
1786 /* ?? Is locking needed? I don't think so */
1787 /* if (TestSetPageLocked(pages[i]))
1791 /* Populate the scatter/gather list */
1792 sgl
[0].page
= pages
[0];
1793 sgl
[0].offset
= uaddr
& ~PAGE_MASK
;
1795 sgl
[0].length
= PAGE_SIZE
- sgl
[0].offset
;
1796 count
-= sgl
[0].length
;
1797 for (i
=1; i
< nr_pages
; i
++) {
1799 sgl
[i
].page
= pages
[i
];
1800 sgl
[i
].length
= count
< PAGE_SIZE
? count
: PAGE_SIZE
;
1805 sgl
[0].length
= count
;
1812 /* for (j=0; j < i; j++)
1813 unlock_page(pages[j]); */
1817 for (j
=0; j
< res
; j
++)
1818 page_cache_release(pages
[j
]);
1824 /* And unmap them... */
1826 st_unmap_user_pages(struct scatterlist
*sgl
, const unsigned int nr_pages
,
1831 for (i
=0; i
< nr_pages
; i
++) {
1832 if (dirtied
&& !PageReserved(sgl
[i
].page
))
1833 SetPageDirty(sgl
[i
].page
);
1834 /* unlock_page(sgl[i].page); */
1835 /* FIXME: cache flush missing for rw==READ
1836 * FIXME: call the correct reference counting function
1838 page_cache_release(sgl
[i
].page
);
1844 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1848 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1850 sg_build_direct(Sg_request
* srp
, Sg_fd
* sfp
, int dxfer_len
)
1852 #ifdef SG_ALLOW_DIO_CODE
1853 sg_io_hdr_t
*hp
= &srp
->header
;
1854 Sg_scatter_hold
*schp
= &srp
->data
;
1855 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1856 struct scatterlist
*sgl
;
1857 int mx_sc_elems
, res
;
1858 struct scsi_device
*sdev
= sfp
->parentdp
->device
;
1860 if (((unsigned long)hp
->dxferp
&
1861 queue_dma_alignment(sdev
->request_queue
)) != 0)
1863 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1864 if (mx_sc_elems
<= 0) {
1867 sgl
= (struct scatterlist
*)schp
->buffer
;
1868 res
= st_map_user_pages(sgl
, mx_sc_elems
, (unsigned long)hp
->dxferp
, dxfer_len
,
1869 (SG_DXFER_TO_DEV
== hp
->dxfer_direction
) ? 1 : 0, ULONG_MAX
);
1872 schp
->k_use_sg
= res
;
1873 schp
->dio_in_use
= 1;
1874 hp
->info
|= SG_INFO_DIRECT_IO
;
1882 sg_build_indirect(Sg_scatter_hold
* schp
, Sg_fd
* sfp
, int buff_size
)
1885 int blk_size
= buff_size
;
1886 unsigned char *p
= NULL
;
1888 if ((blk_size
< 0) || (!sfp
))
1891 ++blk_size
; /* don't know why */
1892 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1893 blk_size
= (blk_size
+ SG_SECTOR_MSK
) & (~SG_SECTOR_MSK
);
1894 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1895 buff_size
, blk_size
));
1896 if (blk_size
<= SG_SCATTER_SZ
) {
1897 p
= sg_page_malloc(blk_size
, sfp
->low_dma
, &ret_sz
);
1900 if (blk_size
== ret_sz
) { /* got it on the first attempt */
1903 schp
->bufflen
= blk_size
;
1904 schp
->b_malloc_len
= blk_size
;
1908 p
= sg_page_malloc(SG_SCATTER_SZ
, sfp
->low_dma
, &ret_sz
);
1912 /* Want some local declarations, so start new block ... */
1913 { /* lets try and build a scatter gather list */
1914 struct scatterlist
*sclp
;
1917 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1920 /* N.B. ret_sz carried into this block ... */
1921 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1922 if (mx_sc_elems
< 0)
1923 return mx_sc_elems
; /* most likely -ENOMEM */
1925 for (k
= 0, sclp
= schp
->buffer
, rem_sz
= blk_size
;
1926 (rem_sz
> 0) && (k
< mx_sc_elems
);
1927 ++k
, rem_sz
-= ret_sz
, ++sclp
) {
1933 SG_SCATTER_SZ
) ? SG_SCATTER_SZ
: rem_sz
;
1934 p
= sg_page_malloc(num
, sfp
->low_dma
, &ret_sz
);
1938 sclp
->page
= virt_to_page(p
);
1939 sclp
->offset
= offset_in_page(p
);
1940 sclp
->length
= ret_sz
;
1942 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1943 k
, sg_scatg2virt(sclp
), ret_sz
));
1944 } /* end of for loop */
1946 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k
, rem_sz
));
1947 schp
->bufflen
= blk_size
;
1948 if (rem_sz
> 0) /* must have failed */
1955 sg_write_xfer(Sg_request
* srp
)
1957 sg_io_hdr_t
*hp
= &srp
->header
;
1958 Sg_scatter_hold
*schp
= &srp
->data
;
1960 int j
, k
, onum
, usglen
, ksglen
, res
;
1961 int iovec_count
= (int) hp
->iovec_count
;
1962 int dxfer_dir
= hp
->dxfer_direction
;
1964 unsigned char __user
*up
;
1965 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
1967 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_TO_DEV
== dxfer_dir
) ||
1968 (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
1969 num_xfer
= (int) (new_interface
? hp
->dxfer_len
: hp
->flags
);
1970 if (schp
->bufflen
< num_xfer
)
1971 num_xfer
= schp
->bufflen
;
1973 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
1975 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
1978 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1979 num_xfer
, iovec_count
, schp
->k_use_sg
));
1982 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
1987 if (0 == schp
->k_use_sg
) { /* kernel has single buffer */
1988 for (j
= 0, p
= schp
->buffer
; j
< onum
; ++j
) {
1989 res
= sg_u_iovec(hp
, iovec_count
, j
, 1, &usglen
, &up
);
1992 usglen
= (num_xfer
> usglen
) ? usglen
: num_xfer
;
1993 if (__copy_from_user(p
, up
, usglen
))
2000 } else { /* kernel using scatter gather list */
2001 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2003 ksglen
= (int) sclp
->length
;
2004 p
= sg_scatg2virt(sclp
);
2005 for (j
= 0, k
= 0; j
< onum
; ++j
) {
2006 res
= sg_u_iovec(hp
, iovec_count
, j
, 1, &usglen
, &up
);
2010 for (; p
; ++sclp
, ksglen
= (int) sclp
->length
,
2011 p
= sg_scatg2virt(sclp
)) {
2014 if (ksglen
> usglen
) {
2015 if (usglen
>= num_xfer
) {
2016 if (__copy_from_user
2021 if (__copy_from_user(p
, up
, usglen
))
2027 if (ksglen
>= num_xfer
) {
2028 if (__copy_from_user
2033 if (__copy_from_user(p
, up
, ksglen
))
2039 if (k
>= schp
->k_use_sg
)
2048 sg_u_iovec(sg_io_hdr_t
* hp
, int sg_num
, int ind
,
2049 int wr_xf
, int *countp
, unsigned char __user
**up
)
2051 int num_xfer
= (int) hp
->dxfer_len
;
2052 unsigned char __user
*p
= hp
->dxferp
;
2056 if (wr_xf
&& ('\0' == hp
->interface_id
))
2057 count
= (int) hp
->flags
; /* holds "old" input_size */
2062 if (__copy_from_user(&iovec
, p
+ ind
*SZ_SG_IOVEC
, SZ_SG_IOVEC
))
2065 count
= (int) iovec
.iov_len
;
2067 if (!access_ok(wr_xf
? VERIFY_READ
: VERIFY_WRITE
, p
, count
))
2077 sg_remove_scat(Sg_scatter_hold
* schp
)
2079 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp
->k_use_sg
));
2080 if (schp
->buffer
&& (schp
->sglist_len
> 0)) {
2081 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2083 if (schp
->dio_in_use
) {
2084 #ifdef SG_ALLOW_DIO_CODE
2085 st_unmap_user_pages(sclp
, schp
->k_use_sg
, TRUE
);
2090 for (k
= 0; (k
< schp
->k_use_sg
) && sg_scatg2virt(sclp
);
2092 SCSI_LOG_TIMEOUT(5, printk(
2093 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2094 k
, sg_scatg2virt(sclp
), sclp
->length
));
2095 sg_page_free(sg_scatg2virt(sclp
), sclp
->length
);
2101 sg_page_free(schp
->buffer
, schp
->sglist_len
);
2102 } else if (schp
->buffer
)
2103 sg_page_free(schp
->buffer
, schp
->b_malloc_len
);
2104 memset(schp
, 0, sizeof (*schp
));
2108 sg_read_xfer(Sg_request
* srp
)
2110 sg_io_hdr_t
*hp
= &srp
->header
;
2111 Sg_scatter_hold
*schp
= &srp
->data
;
2113 int j
, k
, onum
, usglen
, ksglen
, res
;
2114 int iovec_count
= (int) hp
->iovec_count
;
2115 int dxfer_dir
= hp
->dxfer_direction
;
2117 unsigned char __user
*up
;
2118 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
2120 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_FROM_DEV
== dxfer_dir
)
2121 || (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
2122 num_xfer
= hp
->dxfer_len
;
2123 if (schp
->bufflen
< num_xfer
)
2124 num_xfer
= schp
->bufflen
;
2126 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
2128 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
2131 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2132 num_xfer
, iovec_count
, schp
->k_use_sg
));
2135 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
2140 if (0 == schp
->k_use_sg
) { /* kernel has single buffer */
2141 for (j
= 0, p
= schp
->buffer
; j
< onum
; ++j
) {
2142 res
= sg_u_iovec(hp
, iovec_count
, j
, 0, &usglen
, &up
);
2145 usglen
= (num_xfer
> usglen
) ? usglen
: num_xfer
;
2146 if (__copy_to_user(up
, p
, usglen
))
2153 } else { /* kernel using scatter gather list */
2154 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2156 ksglen
= (int) sclp
->length
;
2157 p
= sg_scatg2virt(sclp
);
2158 for (j
= 0, k
= 0; j
< onum
; ++j
) {
2159 res
= sg_u_iovec(hp
, iovec_count
, j
, 0, &usglen
, &up
);
2163 for (; p
; ++sclp
, ksglen
= (int) sclp
->length
,
2164 p
= sg_scatg2virt(sclp
)) {
2167 if (ksglen
> usglen
) {
2168 if (usglen
>= num_xfer
) {
2174 if (__copy_to_user(up
, p
, usglen
))
2180 if (ksglen
>= num_xfer
) {
2186 if (__copy_to_user(up
, p
, ksglen
))
2192 if (k
>= schp
->k_use_sg
)
2201 sg_read_oxfer(Sg_request
* srp
, char __user
*outp
, int num_read_xfer
)
2203 Sg_scatter_hold
*schp
= &srp
->data
;
2205 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2207 if ((!outp
) || (num_read_xfer
<= 0))
2209 if (schp
->k_use_sg
> 0) {
2211 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2213 for (k
= 0; (k
< schp
->k_use_sg
) && sg_scatg2virt(sclp
);
2215 num
= (int) sclp
->length
;
2216 if (num
> num_read_xfer
) {
2218 (outp
, sg_scatg2virt(sclp
), num_read_xfer
))
2223 (outp
, sg_scatg2virt(sclp
), num
))
2225 num_read_xfer
-= num
;
2226 if (num_read_xfer
<= 0)
2232 if (__copy_to_user(outp
, schp
->buffer
, num_read_xfer
))
2239 sg_build_reserve(Sg_fd
* sfp
, int req_size
)
2241 Sg_scatter_hold
*schp
= &sfp
->reserve
;
2243 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size
));
2245 if (req_size
< PAGE_SIZE
)
2246 req_size
= PAGE_SIZE
;
2247 if (0 == sg_build_indirect(schp
, sfp
, req_size
))
2250 sg_remove_scat(schp
);
2251 req_size
>>= 1; /* divide by 2 */
2252 } while (req_size
> (PAGE_SIZE
/ 2));
2256 sg_link_reserve(Sg_fd
* sfp
, Sg_request
* srp
, int size
)
2258 Sg_scatter_hold
*req_schp
= &srp
->data
;
2259 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2262 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size
));
2263 size
= (size
+ 1) & (~1); /* round to even for aha1542 */
2264 if (rsv_schp
->k_use_sg
> 0) {
2267 struct scatterlist
*sclp
=
2268 (struct scatterlist
*) rsv_schp
->buffer
;
2270 for (k
= 0; k
< rsv_schp
->k_use_sg
; ++k
, ++sclp
) {
2271 num
= (int) sclp
->length
;
2274 req_schp
->k_use_sg
= 0;
2275 req_schp
->buffer
= sg_scatg2virt(sclp
);
2277 sfp
->save_scat_len
= num
;
2278 sclp
->length
= (unsigned) rem
;
2279 req_schp
->k_use_sg
= k
+ 1;
2280 req_schp
->sglist_len
=
2281 rsv_schp
->sglist_len
;
2282 req_schp
->buffer
= rsv_schp
->buffer
;
2284 req_schp
->bufflen
= size
;
2285 req_schp
->b_malloc_len
= rsv_schp
->b_malloc_len
;
2290 if (k
>= rsv_schp
->k_use_sg
)
2291 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2293 req_schp
->k_use_sg
= 0;
2294 req_schp
->bufflen
= size
;
2295 req_schp
->buffer
= rsv_schp
->buffer
;
2296 req_schp
->b_malloc_len
= rsv_schp
->b_malloc_len
;
2301 sg_unlink_reserve(Sg_fd
* sfp
, Sg_request
* srp
)
2303 Sg_scatter_hold
*req_schp
= &srp
->data
;
2304 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2306 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2307 (int) req_schp
->k_use_sg
));
2308 if ((rsv_schp
->k_use_sg
> 0) && (req_schp
->k_use_sg
> 0)) {
2309 struct scatterlist
*sclp
=
2310 (struct scatterlist
*) rsv_schp
->buffer
;
2312 if (sfp
->save_scat_len
> 0)
2313 (sclp
+ (req_schp
->k_use_sg
- 1))->length
=
2314 (unsigned) sfp
->save_scat_len
;
2316 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2318 req_schp
->k_use_sg
= 0;
2319 req_schp
->bufflen
= 0;
2320 req_schp
->buffer
= NULL
;
2321 req_schp
->sglist_len
= 0;
2322 sfp
->save_scat_len
= 0;
2327 sg_get_rq_mark(Sg_fd
* sfp
, int pack_id
)
2330 unsigned long iflags
;
2332 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2333 for (resp
= sfp
->headrp
; resp
; resp
= resp
->nextrp
) {
2334 /* look for requests that are ready + not SG_IO owned */
2335 if ((1 == resp
->done
) && (!resp
->sg_io_owned
) &&
2336 ((-1 == pack_id
) || (resp
->header
.pack_id
== pack_id
))) {
2337 resp
->done
= 2; /* guard against other readers */
2341 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2345 #ifdef CONFIG_SCSI_PROC_FS
2347 sg_get_nth_request(Sg_fd
* sfp
, int nth
)
2350 unsigned long iflags
;
2353 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2354 for (k
= 0, resp
= sfp
->headrp
; resp
&& (k
< nth
);
2355 ++k
, resp
= resp
->nextrp
) ;
2356 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2361 /* always adds to end of list */
2363 sg_add_request(Sg_fd
* sfp
)
2366 unsigned long iflags
;
2368 Sg_request
*rp
= sfp
->req_arr
;
2370 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2373 memset(rp
, 0, sizeof (Sg_request
));
2378 if (0 == sfp
->cmd_q
)
2379 resp
= NULL
; /* command queuing disallowed */
2381 for (k
= 0; k
< SG_MAX_QUEUE
; ++k
, ++rp
) {
2385 if (k
< SG_MAX_QUEUE
) {
2386 memset(rp
, 0, sizeof (Sg_request
));
2388 while (resp
->nextrp
)
2389 resp
= resp
->nextrp
;
2397 resp
->nextrp
= NULL
;
2398 resp
->header
.duration
= jiffies
;
2399 resp
->my_cmdp
= NULL
;
2401 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2405 /* Return of 1 for found; 0 for not found */
2407 sg_remove_request(Sg_fd
* sfp
, Sg_request
* srp
)
2409 Sg_request
*prev_rp
;
2411 unsigned long iflags
;
2414 if ((!sfp
) || (!srp
) || (!sfp
->headrp
))
2416 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2417 prev_rp
= sfp
->headrp
;
2418 if (srp
== prev_rp
) {
2419 sfp
->headrp
= prev_rp
->nextrp
;
2420 prev_rp
->parentfp
= NULL
;
2423 while ((rp
= prev_rp
->nextrp
)) {
2425 prev_rp
->nextrp
= rp
->nextrp
;
2426 rp
->parentfp
= NULL
;
2433 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2437 #ifdef CONFIG_SCSI_PROC_FS
2439 sg_get_nth_sfp(Sg_device
* sdp
, int nth
)
2442 unsigned long iflags
;
2445 read_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2446 for (k
= 0, resp
= sdp
->headfp
; resp
&& (k
< nth
);
2447 ++k
, resp
= resp
->nextfp
) ;
2448 read_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2454 sg_add_sfp(Sg_device
* sdp
, int dev
)
2457 unsigned long iflags
;
2459 sfp
= (Sg_fd
*) sg_page_malloc(sizeof (Sg_fd
), 0, NULL
);
2462 memset(sfp
, 0, sizeof (Sg_fd
));
2463 init_waitqueue_head(&sfp
->read_wait
);
2464 rwlock_init(&sfp
->rq_list_lock
);
2466 sfp
->timeout
= SG_DEFAULT_TIMEOUT
;
2467 sfp
->timeout_user
= SG_DEFAULT_TIMEOUT_USER
;
2468 sfp
->force_packid
= SG_DEF_FORCE_PACK_ID
;
2469 sfp
->low_dma
= (SG_DEF_FORCE_LOW_DMA
== 0) ?
2470 sdp
->device
->host
->unchecked_isa_dma
: 1;
2471 sfp
->cmd_q
= SG_DEF_COMMAND_Q
;
2472 sfp
->keep_orphan
= SG_DEF_KEEP_ORPHAN
;
2473 sfp
->parentdp
= sdp
;
2474 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2477 else { /* add to tail of existing list */
2478 Sg_fd
*pfp
= sdp
->headfp
;
2483 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2484 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp
));
2485 sg_build_reserve(sfp
, sg_big_buff
);
2486 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2487 sfp
->reserve
.bufflen
, sfp
->reserve
.k_use_sg
));
2492 __sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2497 prev_fp
= sdp
->headfp
;
2499 sdp
->headfp
= prev_fp
->nextfp
;
2501 while ((fp
= prev_fp
->nextfp
)) {
2503 prev_fp
->nextfp
= fp
->nextfp
;
2509 if (sfp
->reserve
.bufflen
> 0) {
2511 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2512 (int) sfp
->reserve
.bufflen
, (int) sfp
->reserve
.k_use_sg
));
2513 if (sfp
->mmap_called
)
2514 sg_rb_correct4mmap(&sfp
->reserve
, 0); /* undo correction */
2515 sg_remove_scat(&sfp
->reserve
);
2517 sfp
->parentdp
= NULL
;
2518 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp
));
2519 sg_page_free((char *) sfp
, sizeof (Sg_fd
));
2522 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2524 sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2531 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
2533 if (sg_srp_done(srp
, sfp
))
2534 sg_finish_rem_req(srp
);
2539 unsigned long iflags
;
2541 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2542 __sg_remove_sfp(sdp
, sfp
);
2543 if (sdp
->detached
&& (NULL
== sdp
->headfp
)) {
2547 for (k
= 0; k
< maxd
; ++k
) {
2548 if (sdp
== sg_dev_arr
[k
])
2552 sg_dev_arr
[k
] = NULL
;
2553 kfree((char *) sdp
);
2556 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2558 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2559 /* only bump the access_count if we actually succeeded in
2560 * throwing another counter on the host module */
2561 scsi_device_get(sdp
->device
); /* XXX: retval ignored? */
2562 sfp
->closed
= 1; /* flag dirty state on this fd */
2563 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2570 sg_res_in_use(Sg_fd
* sfp
)
2572 const Sg_request
*srp
;
2573 unsigned long iflags
;
2575 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2576 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
)
2579 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2583 /* If retSzp==NULL want exact size or fail */
2585 sg_page_malloc(int rqSz
, int lowDma
, int *retSzp
)
2596 page_mask
= GFP_ATOMIC
| GFP_DMA
| __GFP_NOWARN
;
2598 page_mask
= GFP_ATOMIC
| __GFP_NOWARN
;
2600 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< rqSz
;
2601 order
++, a_size
<<= 1) ;
2602 resp
= (char *) __get_free_pages(page_mask
, order
);
2603 while ((!resp
) && order
&& retSzp
) {
2605 a_size
>>= 1; /* divide by 2, until PAGE_SIZE */
2606 resp
= (char *) __get_free_pages(page_mask
, order
); /* try half */
2610 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2611 memset(resp
, 0, resSz
);
2619 sg_page_free(char *buff
, int size
)
2625 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< size
;
2626 order
++, a_size
<<= 1) ;
2627 free_pages((unsigned long) buff
, order
);
2630 #ifndef MAINTENANCE_IN_CMD
2631 #define MAINTENANCE_IN_CMD 0xa3
2634 static unsigned char allow_ops
[] = { TEST_UNIT_READY
, REQUEST_SENSE
,
2635 INQUIRY
, READ_CAPACITY
, READ_BUFFER
, READ_6
, READ_10
, READ_12
,
2636 READ_16
, MODE_SENSE
, MODE_SENSE_10
, LOG_SENSE
, REPORT_LUNS
,
2637 SERVICE_ACTION_IN
, RECEIVE_DIAGNOSTIC
, READ_LONG
, MAINTENANCE_IN_CMD
2641 sg_allow_access(unsigned char opcode
, char dev_type
)
2645 if (TYPE_SCANNER
== dev_type
) /* TYPE_ROM maybe burner */
2647 for (k
= 0; k
< sizeof (allow_ops
); ++k
) {
2648 if (opcode
== allow_ops
[k
])
2654 #ifdef CONFIG_SCSI_PROC_FS
2659 unsigned long iflags
;
2661 read_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2662 for (k
= sg_dev_max
- 1; k
>= 0; --k
)
2663 if (sg_dev_arr
[k
] && sg_dev_arr
[k
]->device
)
2665 read_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2666 return k
+ 1; /* origin 1 */
2673 Sg_device
*sdp
= NULL
;
2674 unsigned long iflags
;
2676 if (sg_dev_arr
&& (dev
>= 0)) {
2677 read_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2678 if (dev
< sg_dev_max
)
2679 sdp
= sg_dev_arr
[dev
];
2680 read_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2685 #ifdef CONFIG_SCSI_PROC_FS
2687 static struct proc_dir_entry
*sg_proc_sgp
= NULL
;
2689 static char sg_proc_sg_dirname
[] = "scsi/sg";
2691 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
);
2693 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
);
2694 static ssize_t
sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2695 size_t count
, loff_t
*off
);
2696 static struct file_operations adio_fops
= {
2697 /* .owner, .read and .llseek added in sg_proc_init() */
2698 .open
= sg_proc_single_open_adio
,
2699 .write
= sg_proc_write_adio
,
2700 .release
= single_release
,
2703 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
);
2704 static ssize_t
sg_proc_write_dressz(struct file
*filp
,
2705 const char __user
*buffer
, size_t count
, loff_t
*off
);
2706 static struct file_operations dressz_fops
= {
2707 .open
= sg_proc_single_open_dressz
,
2708 .write
= sg_proc_write_dressz
,
2709 .release
= single_release
,
2712 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
);
2713 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
);
2714 static struct file_operations version_fops
= {
2715 .open
= sg_proc_single_open_version
,
2716 .release
= single_release
,
2719 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
);
2720 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
);
2721 static struct file_operations devhdr_fops
= {
2722 .open
= sg_proc_single_open_devhdr
,
2723 .release
= single_release
,
2726 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
);
2727 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
);
2728 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
);
2729 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
);
2730 static void dev_seq_stop(struct seq_file
*s
, void *v
);
2731 static struct file_operations dev_fops
= {
2732 .open
= sg_proc_open_dev
,
2733 .release
= seq_release
,
2735 static struct seq_operations dev_seq_ops
= {
2736 .start
= dev_seq_start
,
2737 .next
= dev_seq_next
,
2738 .stop
= dev_seq_stop
,
2739 .show
= sg_proc_seq_show_dev
,
2742 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
);
2743 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
);
2744 static struct file_operations devstrs_fops
= {
2745 .open
= sg_proc_open_devstrs
,
2746 .release
= seq_release
,
2748 static struct seq_operations devstrs_seq_ops
= {
2749 .start
= dev_seq_start
,
2750 .next
= dev_seq_next
,
2751 .stop
= dev_seq_stop
,
2752 .show
= sg_proc_seq_show_devstrs
,
2755 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
);
2756 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
);
2757 static struct file_operations debug_fops
= {
2758 .open
= sg_proc_open_debug
,
2759 .release
= seq_release
,
2761 static struct seq_operations debug_seq_ops
= {
2762 .start
= dev_seq_start
,
2763 .next
= dev_seq_next
,
2764 .stop
= dev_seq_stop
,
2765 .show
= sg_proc_seq_show_debug
,
2769 struct sg_proc_leaf
{
2771 struct file_operations
* fops
;
2774 static struct sg_proc_leaf sg_proc_leaf_arr
[] = {
2775 {"allow_dio", &adio_fops
},
2776 {"debug", &debug_fops
},
2777 {"def_reserved_size", &dressz_fops
},
2778 {"device_hdr", &devhdr_fops
},
2779 {"devices", &dev_fops
},
2780 {"device_strs", &devstrs_fops
},
2781 {"version", &version_fops
}
2789 sizeof (sg_proc_leaf_arr
) / sizeof (sg_proc_leaf_arr
[0]);
2790 struct proc_dir_entry
*pdep
;
2791 struct sg_proc_leaf
* leaf
;
2793 sg_proc_sgp
= create_proc_entry(sg_proc_sg_dirname
,
2794 S_IFDIR
| S_IRUGO
| S_IXUGO
, NULL
);
2797 for (k
= 0; k
< num_leaves
; ++k
) {
2798 leaf
= &sg_proc_leaf_arr
[k
];
2799 mask
= leaf
->fops
->write
? S_IRUGO
| S_IWUSR
: S_IRUGO
;
2800 pdep
= create_proc_entry(leaf
->name
, mask
, sg_proc_sgp
);
2802 leaf
->fops
->owner
= THIS_MODULE
,
2803 leaf
->fops
->read
= seq_read
,
2804 leaf
->fops
->llseek
= seq_lseek
,
2805 pdep
->proc_fops
= leaf
->fops
;
2812 sg_proc_cleanup(void)
2816 sizeof (sg_proc_leaf_arr
) / sizeof (sg_proc_leaf_arr
[0]);
2820 for (k
= 0; k
< num_leaves
; ++k
)
2821 remove_proc_entry(sg_proc_leaf_arr
[k
].name
, sg_proc_sgp
);
2822 remove_proc_entry(sg_proc_sg_dirname
, NULL
);
2826 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
)
2828 seq_printf(s
, "%d\n", *((int *)s
->private));
2832 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
)
2834 return single_open(file
, sg_proc_seq_show_int
, &sg_allow_dio
);
2838 sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2839 size_t count
, loff_t
*off
)
2844 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2846 num
= (count
< 10) ? count
: 10;
2847 if (copy_from_user(buff
, buffer
, num
))
2850 sg_allow_dio
= simple_strtoul(buff
, NULL
, 10) ? 1 : 0;
2854 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
)
2856 return single_open(file
, sg_proc_seq_show_int
, &sg_big_buff
);
2860 sg_proc_write_dressz(struct file
*filp
, const char __user
*buffer
,
2861 size_t count
, loff_t
*off
)
2864 unsigned long k
= ULONG_MAX
;
2867 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2869 num
= (count
< 10) ? count
: 10;
2870 if (copy_from_user(buff
, buffer
, num
))
2873 k
= simple_strtoul(buff
, NULL
, 10);
2874 if (k
<= 1048576) { /* limit "big buff" to 1 MB */
2881 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
)
2883 seq_printf(s
, "%d\t%s [%s]\n", sg_version_num
, SG_VERSION_STR
,
2888 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
)
2890 return single_open(file
, sg_proc_seq_show_version
, NULL
);
2893 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
)
2895 seq_printf(s
, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2900 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
)
2902 return single_open(file
, sg_proc_seq_show_devhdr
, NULL
);
2905 struct sg_proc_deviter
{
2910 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
)
2912 struct sg_proc_deviter
* it
= kmalloc(sizeof(*it
), GFP_KERNEL
);
2916 if (NULL
== sg_dev_arr
)
2919 it
->max
= sg_last_dev();
2920 if (it
->index
>= it
->max
)
2928 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
2930 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2933 return (it
->index
< it
->max
) ? it
: NULL
;
2936 static void dev_seq_stop(struct seq_file
*s
, void *v
)
2941 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
)
2943 return seq_open(file
, &dev_seq_ops
);
2946 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
)
2948 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2950 struct scsi_device
*scsidp
;
2952 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2953 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
2954 seq_printf(s
, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2955 scsidp
->host
->host_no
, scsidp
->channel
,
2956 scsidp
->id
, scsidp
->lun
, (int) scsidp
->type
,
2958 (int) scsidp
->queue_depth
,
2959 (int) scsidp
->device_busy
,
2960 (int) scsi_device_online(scsidp
));
2962 seq_printf(s
, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2966 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
)
2968 return seq_open(file
, &devstrs_seq_ops
);
2971 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
)
2973 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2975 struct scsi_device
*scsidp
;
2977 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2978 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
2979 seq_printf(s
, "%8.8s\t%16.16s\t%4.4s\n",
2980 scsidp
->vendor
, scsidp
->model
, scsidp
->rev
);
2982 seq_printf(s
, "<no active device>\n");
2986 static void sg_proc_debug_helper(struct seq_file
*s
, Sg_device
* sdp
)
2988 int k
, m
, new_interface
, blen
, usg
;
2991 const sg_io_hdr_t
*hp
;
2994 for (k
= 0; (fp
= sg_get_nth_sfp(sdp
, k
)); ++k
) {
2995 seq_printf(s
, " FD(%d): timeout=%dms bufflen=%d "
2996 "(res)sgat=%d low_dma=%d\n", k
+ 1,
2997 jiffies_to_msecs(fp
->timeout
),
2998 fp
->reserve
.bufflen
,
2999 (int) fp
->reserve
.k_use_sg
,
3001 seq_printf(s
, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
3002 (int) fp
->cmd_q
, (int) fp
->force_packid
,
3003 (int) fp
->keep_orphan
, (int) fp
->closed
);
3004 for (m
= 0; (srp
= sg_get_nth_request(fp
, m
)); ++m
) {
3006 new_interface
= (hp
->interface_id
== '\0') ? 0 : 1;
3007 if (srp
->res_used
) {
3008 if (new_interface
&&
3009 (SG_FLAG_MMAP_IO
& hp
->flags
))
3014 if (SG_INFO_DIRECT_IO_MASK
& hp
->info
)
3020 blen
= srp
->my_cmdp
?
3021 srp
->my_cmdp
->sr_bufflen
: srp
->data
.bufflen
;
3022 usg
= srp
->my_cmdp
?
3023 srp
->my_cmdp
->sr_use_sg
: srp
->data
.k_use_sg
;
3024 seq_printf(s
, srp
->done
?
3025 ((1 == srp
->done
) ? "rcv:" : "fin:")
3026 : (srp
->my_cmdp
? "act:" : "prior:"));
3027 seq_printf(s
, " id=%d blen=%d",
3028 srp
->header
.pack_id
, blen
);
3030 seq_printf(s
, " dur=%d", hp
->duration
);
3032 seq_printf(s
, " t_o/elap=%d/%d",
3033 new_interface
? hp
->timeout
: jiffies_to_msecs(fp
->timeout
),
3034 jiffies_to_msecs(hp
->duration
? (jiffies
- hp
->duration
) : 0));
3035 seq_printf(s
, "ms sgat=%d op=0x%02x\n", usg
,
3036 (int) srp
->data
.cmd_opcode
);
3039 seq_printf(s
, " No requests active\n");
3043 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
)
3045 return seq_open(file
, &debug_seq_ops
);
3048 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
)
3050 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
3053 if (it
&& (0 == it
->index
)) {
3054 seq_printf(s
, "dev_max(currently)=%d max_active_device=%d "
3055 "(origin 1)\n", sg_dev_max
, (int)it
->max
);
3056 seq_printf(s
, " def_reserved_size=%d\n", sg_big_buff
);
3058 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
3060 struct scsi_device
*scsidp
= sdp
->device
;
3062 if (NULL
== scsidp
) {
3063 seq_printf(s
, "device %d detached ??\n",
3068 if (sg_get_nth_sfp(sdp
, 0)) {
3069 seq_printf(s
, " >>> device=%s ",
3070 sdp
->disk
->disk_name
);
3072 seq_printf(s
, "detached pending close ");
3075 (s
, "scsi%d chan=%d id=%d lun=%d em=%d",
3076 scsidp
->host
->host_no
,
3077 scsidp
->channel
, scsidp
->id
,
3079 scsidp
->host
->hostt
->emulated
);
3080 seq_printf(s
, " sg_tablesize=%d excl=%d\n",
3081 sdp
->sg_tablesize
, sdp
->exclude
);
3083 sg_proc_debug_helper(s
, sdp
);
3088 #endif /* CONFIG_SCSI_PROC_FS */
3090 module_init(init_sg
);
3091 module_exit(exit_sg
);
3092 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR
);