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
= 30534; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.34"
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/module.h>
34 #include <linux/kernel.h>
35 #include <linux/sched.h>
36 #include <linux/string.h>
38 #include <linux/errno.h>
39 #include <linux/mtio.h>
40 #include <linux/ioctl.h>
41 #include <linux/fcntl.h>
42 #include <linux/init.h>
43 #include <linux/poll.h>
44 #include <linux/moduleparam.h>
45 #include <linux/cdev.h>
46 #include <linux/idr.h>
47 #include <linux/seq_file.h>
48 #include <linux/blkdev.h>
49 #include <linux/delay.h>
50 #include <linux/scatterlist.h>
51 #include <linux/blktrace_api.h>
52 #include <linux/smp_lock.h>
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_host.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_ioctl.h>
61 #include "scsi_logging.h"
63 #ifdef CONFIG_SCSI_PROC_FS
64 #include <linux/proc_fs.h>
65 static char *sg_version_date
= "20061027";
67 static int sg_proc_init(void);
68 static void sg_proc_cleanup(void);
71 #define SG_ALLOW_DIO_DEF 0
72 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
74 #define SG_MAX_DEVS 32768
77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
78 * Then when using 32 bit integers x * m may overflow during the calculation.
79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
80 * calculates the same, but prevents the overflow when both m and d
81 * are "small" numbers (like HZ and USER_HZ).
82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
85 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
87 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
89 int sg_big_buff
= SG_DEF_RESERVED_SIZE
;
90 /* N.B. This variable is readable and writeable via
91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
92 of this size (or less if there is not enough memory) will be reserved
93 for use by this file descriptor. [Deprecated usage: this variable is also
94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
95 the kernel (i.e. it is not a module).] */
96 static int def_reserved_size
= -1; /* picks up init parameter */
97 static int sg_allow_dio
= SG_ALLOW_DIO_DEF
;
99 static int scatter_elem_sz
= SG_SCATTER_SZ
;
100 static int scatter_elem_sz_prev
= SG_SCATTER_SZ
;
102 #define SG_SECTOR_SZ 512
103 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
105 static int sg_add(struct device
*, struct class_interface
*);
106 static void sg_remove(struct device
*, struct class_interface
*);
108 static DEFINE_IDR(sg_index_idr
);
109 static DEFINE_RWLOCK(sg_index_lock
); /* Also used to lock
110 file descriptor list for device */
112 static struct class_interface sg_interface
= {
114 .remove_dev
= sg_remove
,
117 typedef struct sg_scatter_hold
{ /* holding area for scsi scatter gather info */
118 unsigned short k_use_sg
; /* Count of kernel scatter-gather pieces */
119 unsigned sglist_len
; /* size of malloc'd scatter-gather list ++ */
120 unsigned bufflen
; /* Size of (aggregate) data buffer */
121 unsigned b_malloc_len
; /* actual len malloc'ed in buffer */
122 struct scatterlist
*buffer
;/* scatter list */
123 char dio_in_use
; /* 0->indirect IO (or mmap), 1->dio */
124 unsigned char cmd_opcode
; /* first byte of command */
127 struct sg_device
; /* forward declarations */
130 typedef struct sg_request
{ /* SG_MAX_QUEUE requests outstanding per file */
131 struct sg_request
*nextrp
; /* NULL -> tail request (slist) */
132 struct sg_fd
*parentfp
; /* NULL -> not in use */
133 Sg_scatter_hold data
; /* hold buffer, perhaps scatter list */
134 sg_io_hdr_t header
; /* scsi command+info, see <scsi/sg.h> */
135 unsigned char sense_b
[SCSI_SENSE_BUFFERSIZE
];
136 char res_used
; /* 1 -> using reserve buffer, 0 -> not ... */
137 char orphan
; /* 1 -> drop on sight, 0 -> normal */
138 char sg_io_owned
; /* 1 -> packet belongs to SG_IO */
139 volatile char done
; /* 0->before bh, 1->before read, 2->read */
142 typedef struct sg_fd
{ /* holds the state of a file descriptor */
143 struct sg_fd
*nextfp
; /* NULL when last opened fd on this device */
144 struct sg_device
*parentdp
; /* owning device */
145 wait_queue_head_t read_wait
; /* queue read until command done */
146 rwlock_t rq_list_lock
; /* protect access to list in req_arr */
147 int timeout
; /* defaults to SG_DEFAULT_TIMEOUT */
148 int timeout_user
; /* defaults to SG_DEFAULT_TIMEOUT_USER */
149 Sg_scatter_hold reserve
; /* buffer held for this file descriptor */
150 unsigned save_scat_len
; /* original length of trunc. scat. element */
151 Sg_request
*headrp
; /* head of request slist, NULL->empty */
152 struct fasync_struct
*async_qp
; /* used by asynchronous notification */
153 Sg_request req_arr
[SG_MAX_QUEUE
]; /* used as singly-linked list */
154 char low_dma
; /* as in parent but possibly overridden to 1 */
155 char force_packid
; /* 1 -> pack_id input to read(), 0 -> ignored */
156 volatile char closed
; /* 1 -> fd closed but request(s) outstanding */
157 char cmd_q
; /* 1 -> allow command queuing, 0 -> don't */
158 char next_cmd_len
; /* 0 -> automatic (def), >0 -> use on next write() */
159 char keep_orphan
; /* 0 -> drop orphan (def), 1 -> keep for read() */
160 char mmap_called
; /* 0 -> mmap() never called on this fd */
163 typedef struct sg_device
{ /* holds the state of each scsi generic device */
164 struct scsi_device
*device
;
165 wait_queue_head_t o_excl_wait
; /* queue open() when O_EXCL in use */
166 int sg_tablesize
; /* adapter's max scatter-gather table size */
167 u32 index
; /* device index number */
168 Sg_fd
*headfp
; /* first open fd belonging to this device */
169 volatile char detached
; /* 0->attached, 1->detached pending removal */
170 volatile char exclude
; /* opened for exclusive access */
171 char sgdebug
; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
172 struct gendisk
*disk
;
173 struct cdev
* cdev
; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
176 static int sg_fasync(int fd
, struct file
*filp
, int mode
);
177 /* tasklet or soft irq callback */
178 static void sg_cmd_done(void *data
, char *sense
, int result
, int resid
);
179 static int sg_start_req(Sg_request
* srp
);
180 static void sg_finish_rem_req(Sg_request
* srp
);
181 static int sg_build_indirect(Sg_scatter_hold
* schp
, Sg_fd
* sfp
, int buff_size
);
182 static int sg_build_sgat(Sg_scatter_hold
* schp
, const Sg_fd
* sfp
,
184 static ssize_t
sg_new_read(Sg_fd
* sfp
, char __user
*buf
, size_t count
,
186 static ssize_t
sg_new_write(Sg_fd
*sfp
, struct file
*file
,
187 const char __user
*buf
, size_t count
, int blocking
,
188 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 struct page
*sg_page_malloc(int rqSz
, int lowDma
, int *retSzp
);
201 static void sg_page_free(struct page
*page
, 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_build_direct(Sg_request
* srp
, Sg_fd
* sfp
, int dxfer_len
);
210 static Sg_device
*sg_get_dev(int dev
);
211 #ifdef CONFIG_SCSI_PROC_FS
212 static int sg_last_dev(void);
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)
221 sg_open(struct inode
*inode
, struct file
*filp
)
223 int dev
= iminor(inode
);
224 int flags
= filp
->f_flags
;
225 struct request_queue
*q
;
232 nonseekable_open(inode
, filp
);
233 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev
, flags
));
234 sdp
= sg_get_dev(dev
);
235 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
);
252 if (!((flags
& O_NONBLOCK
) ||
253 scsi_block_when_processing_errors(sdp
->device
))) {
255 /* we are in error recovery for this device */
259 if (flags
& O_EXCL
) {
260 if (O_RDONLY
== (flags
& O_ACCMODE
)) {
261 retval
= -EPERM
; /* Can't lock it with read only access */
264 if (sdp
->headfp
&& (flags
& O_NONBLOCK
)) {
269 __wait_event_interruptible(sdp
->o_excl_wait
,
270 ((sdp
->headfp
|| sdp
->exclude
) ? 0 : (sdp
->exclude
= 1)), res
);
272 retval
= res
; /* -ERESTARTSYS because signal hit process */
275 } else if (sdp
->exclude
) { /* some other fd has an exclusive lock on dev */
276 if (flags
& O_NONBLOCK
) {
281 __wait_event_interruptible(sdp
->o_excl_wait
, (!sdp
->exclude
),
284 retval
= res
; /* -ERESTARTSYS because signal hit process */
292 if (!sdp
->headfp
) { /* no existing opens on this device */
294 q
= sdp
->device
->request_queue
;
295 sdp
->sg_tablesize
= min(q
->max_hw_segments
,
296 q
->max_phys_segments
);
298 if ((sfp
= sg_add_sfp(sdp
, dev
)))
299 filp
->private_data
= sfp
;
302 sdp
->exclude
= 0; /* undo if error */
310 scsi_device_put(sdp
->device
);
315 /* Following function was formerly called 'sg_close' */
317 sg_release(struct inode
*inode
, struct file
*filp
)
322 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
324 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp
->disk
->disk_name
));
325 sg_fasync(-1, filp
, 0); /* remove filp from async notification list */
326 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* Returns 1 when sdp gone */
327 if (!sdp
->detached
) {
328 scsi_device_put(sdp
->device
);
331 wake_up_interruptible(&sdp
->o_excl_wait
);
337 sg_read(struct file
*filp
, char __user
*buf
, size_t count
, loff_t
* ppos
)
342 int req_pack_id
= -1;
344 struct sg_header
*old_hdr
= NULL
;
347 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
349 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
350 sdp
->disk
->disk_name
, (int) count
));
352 if (!access_ok(VERIFY_WRITE
, buf
, count
))
354 if (sfp
->force_packid
&& (count
>= SZ_SG_HEADER
)) {
355 old_hdr
= kmalloc(SZ_SG_HEADER
, GFP_KERNEL
);
358 if (__copy_from_user(old_hdr
, buf
, SZ_SG_HEADER
)) {
362 if (old_hdr
->reply_len
< 0) {
363 if (count
>= SZ_SG_IO_HDR
) {
364 sg_io_hdr_t
*new_hdr
;
365 new_hdr
= kmalloc(SZ_SG_IO_HDR
, GFP_KERNEL
);
370 retval
=__copy_from_user
371 (new_hdr
, buf
, SZ_SG_IO_HDR
);
372 req_pack_id
= new_hdr
->pack_id
;
380 req_pack_id
= old_hdr
->pack_id
;
382 srp
= sg_get_rq_mark(sfp
, req_pack_id
);
383 if (!srp
) { /* now wait on packet to arrive */
388 if (filp
->f_flags
& O_NONBLOCK
) {
393 retval
= 0; /* following macro beats race condition */
394 __wait_event_interruptible(sfp
->read_wait
,
396 (srp
= sg_get_rq_mark(sfp
, req_pack_id
))),
405 /* -ERESTARTSYS as signal hit process */
409 if (srp
->header
.interface_id
!= '\0') {
410 retval
= sg_new_read(sfp
, buf
, count
, srp
);
415 if (old_hdr
== NULL
) {
416 old_hdr
= kmalloc(SZ_SG_HEADER
, GFP_KERNEL
);
422 memset(old_hdr
, 0, SZ_SG_HEADER
);
423 old_hdr
->reply_len
= (int) hp
->timeout
;
424 old_hdr
->pack_len
= old_hdr
->reply_len
; /* old, strange behaviour */
425 old_hdr
->pack_id
= hp
->pack_id
;
426 old_hdr
->twelve_byte
=
427 ((srp
->data
.cmd_opcode
>= 0xc0) && (12 == hp
->cmd_len
)) ? 1 : 0;
428 old_hdr
->target_status
= hp
->masked_status
;
429 old_hdr
->host_status
= hp
->host_status
;
430 old_hdr
->driver_status
= hp
->driver_status
;
431 if ((CHECK_CONDITION
& hp
->masked_status
) ||
432 (DRIVER_SENSE
& hp
->driver_status
))
433 memcpy(old_hdr
->sense_buffer
, srp
->sense_b
,
434 sizeof (old_hdr
->sense_buffer
));
435 switch (hp
->host_status
) {
436 /* This setup of 'result' is for backward compatibility and is best
437 ignored by the user who should use target, host + driver status */
439 case DID_PASSTHROUGH
:
446 old_hdr
->result
= EBUSY
;
453 old_hdr
->result
= EIO
;
456 old_hdr
->result
= (srp
->sense_b
[0] == 0 &&
457 hp
->masked_status
== GOOD
) ? 0 : EIO
;
460 old_hdr
->result
= EIO
;
464 /* Now copy the result back to the user buffer. */
465 if (count
>= SZ_SG_HEADER
) {
466 if (__copy_to_user(buf
, old_hdr
, SZ_SG_HEADER
)) {
471 if (count
> old_hdr
->reply_len
)
472 count
= old_hdr
->reply_len
;
473 if (count
> SZ_SG_HEADER
) {
474 if (sg_read_oxfer(srp
, buf
, count
- SZ_SG_HEADER
)) {
480 count
= (old_hdr
->result
== 0) ? 0 : -EIO
;
481 sg_finish_rem_req(srp
);
489 sg_new_read(Sg_fd
* sfp
, char __user
*buf
, size_t count
, Sg_request
* srp
)
491 sg_io_hdr_t
*hp
= &srp
->header
;
495 if (count
< SZ_SG_IO_HDR
) {
500 if ((hp
->mx_sb_len
> 0) && hp
->sbp
) {
501 if ((CHECK_CONDITION
& hp
->masked_status
) ||
502 (DRIVER_SENSE
& hp
->driver_status
)) {
503 int sb_len
= SCSI_SENSE_BUFFERSIZE
;
504 sb_len
= (hp
->mx_sb_len
> sb_len
) ? sb_len
: hp
->mx_sb_len
;
505 len
= 8 + (int) srp
->sense_b
[7]; /* Additional sense length field */
506 len
= (len
> sb_len
) ? sb_len
: len
;
507 if (copy_to_user(hp
->sbp
, srp
->sense_b
, len
)) {
514 if (hp
->masked_status
|| hp
->host_status
|| hp
->driver_status
)
515 hp
->info
|= SG_INFO_CHECK
;
516 if (copy_to_user(buf
, hp
, SZ_SG_IO_HDR
)) {
520 err
= sg_read_xfer(srp
);
522 sg_finish_rem_req(srp
);
523 return (0 == err
) ? count
: err
;
527 sg_write(struct file
*filp
, const char __user
*buf
, size_t count
, loff_t
* ppos
)
529 int mxsize
, cmd_size
, k
;
530 int input_size
, blocking
;
531 unsigned char opcode
;
535 struct sg_header old_hdr
;
537 unsigned char cmnd
[MAX_COMMAND_SIZE
];
539 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
541 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
542 sdp
->disk
->disk_name
, (int) count
));
545 if (!((filp
->f_flags
& O_NONBLOCK
) ||
546 scsi_block_when_processing_errors(sdp
->device
)))
549 if (!access_ok(VERIFY_READ
, buf
, count
))
550 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
551 if (count
< SZ_SG_HEADER
)
553 if (__copy_from_user(&old_hdr
, buf
, SZ_SG_HEADER
))
555 blocking
= !(filp
->f_flags
& O_NONBLOCK
);
556 if (old_hdr
.reply_len
< 0)
557 return sg_new_write(sfp
, filp
, buf
, count
, blocking
, 0, NULL
);
558 if (count
< (SZ_SG_HEADER
+ 6))
559 return -EIO
; /* The minimum scsi command length is 6 bytes. */
561 if (!(srp
= sg_add_request(sfp
))) {
562 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
566 __get_user(opcode
, buf
);
567 if (sfp
->next_cmd_len
> 0) {
568 if (sfp
->next_cmd_len
> MAX_COMMAND_SIZE
) {
569 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
570 sfp
->next_cmd_len
= 0;
571 sg_remove_request(sfp
, srp
);
574 cmd_size
= sfp
->next_cmd_len
;
575 sfp
->next_cmd_len
= 0; /* reset so only this write() effected */
577 cmd_size
= COMMAND_SIZE(opcode
); /* based on SCSI command group */
578 if ((opcode
>= 0xc0) && old_hdr
.twelve_byte
)
581 SCSI_LOG_TIMEOUT(4, printk(
582 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode
, cmd_size
));
583 /* Determine buffer size. */
584 input_size
= count
- cmd_size
;
585 mxsize
= (input_size
> old_hdr
.reply_len
) ? input_size
: old_hdr
.reply_len
;
586 mxsize
-= SZ_SG_HEADER
;
587 input_size
-= SZ_SG_HEADER
;
588 if (input_size
< 0) {
589 sg_remove_request(sfp
, srp
);
590 return -EIO
; /* User did not pass enough bytes for this command. */
593 hp
->interface_id
= '\0'; /* indicator of old interface tunnelled */
594 hp
->cmd_len
= (unsigned char) cmd_size
;
598 hp
->dxfer_direction
= (old_hdr
.reply_len
> SZ_SG_HEADER
) ?
599 SG_DXFER_TO_FROM_DEV
: SG_DXFER_TO_DEV
;
601 hp
->dxfer_direction
= (mxsize
> 0) ? SG_DXFER_FROM_DEV
: SG_DXFER_NONE
;
602 hp
->dxfer_len
= mxsize
;
603 hp
->dxferp
= (char __user
*)buf
+ cmd_size
;
605 hp
->timeout
= old_hdr
.reply_len
; /* structure abuse ... */
606 hp
->flags
= input_size
; /* structure abuse ... */
607 hp
->pack_id
= old_hdr
.pack_id
;
609 if (__copy_from_user(cmnd
, buf
, cmd_size
))
612 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
613 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
614 * is a non-zero input_size, so emit a warning.
616 if (hp
->dxfer_direction
== SG_DXFER_TO_FROM_DEV
) {
617 static char cmd
[TASK_COMM_LEN
];
618 if (strcmp(current
->comm
, cmd
) && printk_ratelimit()) {
620 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
621 "guessing data in;\n" KERN_WARNING
" "
622 "program %s not setting count and/or reply_len properly\n",
623 old_hdr
.reply_len
- (int)SZ_SG_HEADER
,
624 input_size
, (unsigned int) cmnd
[0],
626 strcpy(cmd
, current
->comm
);
629 k
= sg_common_write(sfp
, srp
, cmnd
, sfp
->timeout
, blocking
);
630 return (k
< 0) ? k
: count
;
634 sg_new_write(Sg_fd
*sfp
, struct file
*file
, const char __user
*buf
,
635 size_t count
, int blocking
, int read_only
,
641 unsigned char cmnd
[MAX_COMMAND_SIZE
];
643 unsigned long ul_timeout
;
645 if (count
< SZ_SG_IO_HDR
)
647 if (!access_ok(VERIFY_READ
, buf
, count
))
648 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
650 sfp
->cmd_q
= 1; /* when sg_io_hdr seen, set command queuing on */
651 if (!(srp
= sg_add_request(sfp
))) {
652 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
656 if (__copy_from_user(hp
, buf
, SZ_SG_IO_HDR
)) {
657 sg_remove_request(sfp
, srp
);
660 if (hp
->interface_id
!= 'S') {
661 sg_remove_request(sfp
, srp
);
664 if (hp
->flags
& SG_FLAG_MMAP_IO
) {
665 if (hp
->dxfer_len
> sfp
->reserve
.bufflen
) {
666 sg_remove_request(sfp
, srp
);
667 return -ENOMEM
; /* MMAP_IO size must fit in reserve buffer */
669 if (hp
->flags
& SG_FLAG_DIRECT_IO
) {
670 sg_remove_request(sfp
, srp
);
671 return -EINVAL
; /* either MMAP_IO or DIRECT_IO (not both) */
673 if (sg_res_in_use(sfp
)) {
674 sg_remove_request(sfp
, srp
);
675 return -EBUSY
; /* reserve buffer already being used */
678 ul_timeout
= msecs_to_jiffies(srp
->header
.timeout
);
679 timeout
= (ul_timeout
< INT_MAX
) ? ul_timeout
: INT_MAX
;
680 if ((!hp
->cmdp
) || (hp
->cmd_len
< 6) || (hp
->cmd_len
> sizeof (cmnd
))) {
681 sg_remove_request(sfp
, srp
);
684 if (!access_ok(VERIFY_READ
, hp
->cmdp
, hp
->cmd_len
)) {
685 sg_remove_request(sfp
, srp
);
686 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
688 if (__copy_from_user(cmnd
, hp
->cmdp
, hp
->cmd_len
)) {
689 sg_remove_request(sfp
, srp
);
692 if (read_only
&& !blk_verify_command(file
, cmnd
)) {
693 sg_remove_request(sfp
, srp
);
696 k
= sg_common_write(sfp
, srp
, cmnd
, timeout
, blocking
);
705 sg_common_write(Sg_fd
* sfp
, Sg_request
* srp
,
706 unsigned char *cmnd
, int timeout
, int blocking
)
709 Sg_device
*sdp
= sfp
->parentdp
;
710 sg_io_hdr_t
*hp
= &srp
->header
;
712 srp
->data
.cmd_opcode
= cmnd
[0]; /* hold opcode of command */
714 hp
->masked_status
= 0;
718 hp
->driver_status
= 0;
720 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
721 (int) cmnd
[0], (int) hp
->cmd_len
));
723 if ((k
= sg_start_req(srp
))) {
724 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k
));
725 sg_finish_rem_req(srp
);
726 return k
; /* probably out of space --> ENOMEM */
728 if ((k
= sg_write_xfer(srp
))) {
729 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
730 sg_finish_rem_req(srp
);
734 sg_finish_rem_req(srp
);
738 switch (hp
->dxfer_direction
) {
739 case SG_DXFER_TO_FROM_DEV
:
740 case SG_DXFER_FROM_DEV
:
741 data_dir
= DMA_FROM_DEVICE
;
743 case SG_DXFER_TO_DEV
:
744 data_dir
= DMA_TO_DEVICE
;
746 case SG_DXFER_UNKNOWN
:
747 data_dir
= DMA_BIDIRECTIONAL
;
753 hp
->duration
= jiffies_to_msecs(jiffies
);
754 /* Now send everything of to mid-level. The next time we hear about this
755 packet is when sg_cmd_done() is called (i.e. a callback). */
756 if (scsi_execute_async(sdp
->device
, cmnd
, hp
->cmd_len
, data_dir
, srp
->data
.buffer
,
757 hp
->dxfer_len
, srp
->data
.k_use_sg
, timeout
,
758 SG_DEFAULT_RETRIES
, srp
, sg_cmd_done
,
760 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
762 * most likely out of mem, but could also be a bad map
764 sg_finish_rem_req(srp
);
771 sg_srp_done(Sg_request
*srp
, Sg_fd
*sfp
)
773 unsigned long iflags
;
776 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
778 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
783 sg_ioctl(struct inode
*inode
, struct file
*filp
,
784 unsigned int cmd_in
, unsigned long arg
)
786 void __user
*p
= (void __user
*)arg
;
788 int result
, val
, read_only
;
792 unsigned long iflags
;
794 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
796 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
797 sdp
->disk
->disk_name
, (int) cmd_in
));
798 read_only
= (O_RDWR
!= (filp
->f_flags
& O_ACCMODE
));
803 int blocking
= 1; /* ignore O_NONBLOCK flag */
807 if (!scsi_block_when_processing_errors(sdp
->device
))
809 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_IO_HDR
))
812 sg_new_write(sfp
, filp
, p
, SZ_SG_IO_HDR
,
813 blocking
, read_only
, &srp
);
816 srp
->sg_io_owned
= 1;
818 result
= 0; /* following macro to beat race condition */
819 __wait_event_interruptible(sfp
->read_wait
,
820 (sdp
->detached
|| sfp
->closed
|| sg_srp_done(srp
, sfp
)),
825 return 0; /* request packet dropped already */
829 return result
; /* -ERESTARTSYS because signal hit process */
831 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
833 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
834 result
= sg_new_read(sfp
, p
, SZ_SG_IO_HDR
, srp
);
835 return (result
< 0) ? result
: 0;
838 result
= get_user(val
, ip
);
843 if (val
>= MULDIV (INT_MAX
, USER_HZ
, HZ
))
844 val
= MULDIV (INT_MAX
, USER_HZ
, HZ
);
845 sfp
->timeout_user
= val
;
846 sfp
->timeout
= MULDIV (val
, HZ
, USER_HZ
);
849 case SG_GET_TIMEOUT
: /* N.B. User receives timeout as return value */
850 /* strange ..., for backward compatibility */
851 return sfp
->timeout_user
;
852 case SG_SET_FORCE_LOW_DMA
:
853 result
= get_user(val
, ip
);
858 if ((0 == sfp
->low_dma
) && (0 == sg_res_in_use(sfp
))) {
859 val
= (int) sfp
->reserve
.bufflen
;
860 sg_remove_scat(&sfp
->reserve
);
861 sg_build_reserve(sfp
, val
);
866 sfp
->low_dma
= sdp
->device
->host
->unchecked_isa_dma
;
870 return put_user((int) sfp
->low_dma
, ip
);
872 if (!access_ok(VERIFY_WRITE
, p
, sizeof (sg_scsi_id_t
)))
875 sg_scsi_id_t __user
*sg_idp
= p
;
879 __put_user((int) sdp
->device
->host
->host_no
,
881 __put_user((int) sdp
->device
->channel
,
883 __put_user((int) sdp
->device
->id
, &sg_idp
->scsi_id
);
884 __put_user((int) sdp
->device
->lun
, &sg_idp
->lun
);
885 __put_user((int) sdp
->device
->type
, &sg_idp
->scsi_type
);
886 __put_user((short) sdp
->device
->host
->cmd_per_lun
,
887 &sg_idp
->h_cmd_per_lun
);
888 __put_user((short) sdp
->device
->queue_depth
,
889 &sg_idp
->d_queue_depth
);
890 __put_user(0, &sg_idp
->unused
[0]);
891 __put_user(0, &sg_idp
->unused
[1]);
894 case SG_SET_FORCE_PACK_ID
:
895 result
= get_user(val
, ip
);
898 sfp
->force_packid
= val
? 1 : 0;
901 if (!access_ok(VERIFY_WRITE
, ip
, sizeof (int)))
903 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
904 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
905 if ((1 == srp
->done
) && (!srp
->sg_io_owned
)) {
906 read_unlock_irqrestore(&sfp
->rq_list_lock
,
908 __put_user(srp
->header
.pack_id
, ip
);
912 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
915 case SG_GET_NUM_WAITING
:
916 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
917 for (val
= 0, srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
918 if ((1 == srp
->done
) && (!srp
->sg_io_owned
))
921 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
922 return put_user(val
, ip
);
923 case SG_GET_SG_TABLESIZE
:
924 return put_user(sdp
->sg_tablesize
, ip
);
925 case SG_SET_RESERVED_SIZE
:
926 result
= get_user(val
, ip
);
931 val
= min_t(int, val
,
932 sdp
->device
->request_queue
->max_sectors
* 512);
933 if (val
!= sfp
->reserve
.bufflen
) {
934 if (sg_res_in_use(sfp
) || sfp
->mmap_called
)
936 sg_remove_scat(&sfp
->reserve
);
937 sg_build_reserve(sfp
, val
);
940 case SG_GET_RESERVED_SIZE
:
941 val
= min_t(int, sfp
->reserve
.bufflen
,
942 sdp
->device
->request_queue
->max_sectors
* 512);
943 return put_user(val
, ip
);
944 case SG_SET_COMMAND_Q
:
945 result
= get_user(val
, ip
);
948 sfp
->cmd_q
= val
? 1 : 0;
950 case SG_GET_COMMAND_Q
:
951 return put_user((int) sfp
->cmd_q
, ip
);
952 case SG_SET_KEEP_ORPHAN
:
953 result
= get_user(val
, ip
);
956 sfp
->keep_orphan
= val
;
958 case SG_GET_KEEP_ORPHAN
:
959 return put_user((int) sfp
->keep_orphan
, ip
);
960 case SG_NEXT_CMD_LEN
:
961 result
= get_user(val
, ip
);
964 sfp
->next_cmd_len
= (val
> 0) ? val
: 0;
966 case SG_GET_VERSION_NUM
:
967 return put_user(sg_version_num
, ip
);
968 case SG_GET_ACCESS_COUNT
:
969 /* faked - we don't have a real access count anymore */
970 val
= (sdp
->device
? 1 : 0);
971 return put_user(val
, ip
);
972 case SG_GET_REQUEST_TABLE
:
973 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_REQ_INFO
* SG_MAX_QUEUE
))
976 sg_req_info_t
*rinfo
;
979 rinfo
= kmalloc(SZ_SG_REQ_INFO
* SG_MAX_QUEUE
,
983 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
984 for (srp
= sfp
->headrp
, val
= 0; val
< SG_MAX_QUEUE
;
985 ++val
, srp
= srp
? srp
->nextrp
: srp
) {
986 memset(&rinfo
[val
], 0, SZ_SG_REQ_INFO
);
988 rinfo
[val
].req_state
= srp
->done
+ 1;
990 srp
->header
.masked_status
&
991 srp
->header
.host_status
&
992 srp
->header
.driver_status
;
994 rinfo
[val
].duration
=
995 srp
->header
.duration
;
997 ms
= jiffies_to_msecs(jiffies
);
998 rinfo
[val
].duration
=
999 (ms
> srp
->header
.duration
) ?
1000 (ms
- srp
->header
.duration
) : 0;
1002 rinfo
[val
].orphan
= srp
->orphan
;
1003 rinfo
[val
].sg_io_owned
=
1005 rinfo
[val
].pack_id
=
1006 srp
->header
.pack_id
;
1007 rinfo
[val
].usr_ptr
=
1008 srp
->header
.usr_ptr
;
1011 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1012 result
= __copy_to_user(p
, rinfo
,
1013 SZ_SG_REQ_INFO
* SG_MAX_QUEUE
);
1014 result
= result
? -EFAULT
: 0;
1018 case SG_EMULATED_HOST
:
1021 return put_user(sdp
->device
->host
->hostt
->emulated
, ip
);
1025 if (filp
->f_flags
& O_NONBLOCK
) {
1026 if (scsi_host_in_recovery(sdp
->device
->host
))
1028 } else if (!scsi_block_when_processing_errors(sdp
->device
))
1030 result
= get_user(val
, ip
);
1033 if (SG_SCSI_RESET_NOTHING
== val
)
1036 case SG_SCSI_RESET_DEVICE
:
1037 val
= SCSI_TRY_RESET_DEVICE
;
1039 case SG_SCSI_RESET_BUS
:
1040 val
= SCSI_TRY_RESET_BUS
;
1042 case SG_SCSI_RESET_HOST
:
1043 val
= SCSI_TRY_RESET_HOST
;
1048 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
1050 return (scsi_reset_provider(sdp
->device
, val
) ==
1051 SUCCESS
) ? 0 : -EIO
;
1052 case SCSI_IOCTL_SEND_COMMAND
:
1056 unsigned char opcode
= WRITE_6
;
1057 Scsi_Ioctl_Command __user
*siocp
= p
;
1059 if (copy_from_user(&opcode
, siocp
->data
, 1))
1061 if (!blk_verify_command(filp
, &opcode
))
1064 return sg_scsi_ioctl(filp
, sdp
->device
->request_queue
, NULL
, p
);
1066 result
= get_user(val
, ip
);
1069 sdp
->sgdebug
= (char) val
;
1071 case SCSI_IOCTL_GET_IDLUN
:
1072 case SCSI_IOCTL_GET_BUS_NUMBER
:
1073 case SCSI_IOCTL_PROBE_HOST
:
1074 case SG_GET_TRANSFORM
:
1077 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1079 return put_user(sdp
->device
->request_queue
->max_sectors
* 512,
1082 return blk_trace_setup(sdp
->device
->request_queue
,
1083 sdp
->disk
->disk_name
,
1084 sdp
->device
->sdev_gendev
.devt
,
1087 return blk_trace_startstop(sdp
->device
->request_queue
, 1);
1089 return blk_trace_startstop(sdp
->device
->request_queue
, 0);
1090 case BLKTRACETEARDOWN
:
1091 return blk_trace_remove(sdp
->device
->request_queue
);
1094 return -EPERM
; /* don't know so take safe approach */
1095 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1099 #ifdef CONFIG_COMPAT
1100 static long sg_compat_ioctl(struct file
*filp
, unsigned int cmd_in
, unsigned long arg
)
1104 struct scsi_device
*sdev
;
1106 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1110 if (sdev
->host
->hostt
->compat_ioctl
) {
1113 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd_in
, (void __user
*)arg
);
1118 return -ENOIOCTLCMD
;
1123 sg_poll(struct file
*filp
, poll_table
* wait
)
1125 unsigned int res
= 0;
1130 unsigned long iflags
;
1132 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
))
1135 poll_wait(filp
, &sfp
->read_wait
, wait
);
1136 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1137 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
1138 /* if any read waiting, flag it */
1139 if ((0 == res
) && (1 == srp
->done
) && (!srp
->sg_io_owned
))
1140 res
= POLLIN
| POLLRDNORM
;
1143 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1147 else if (!sfp
->cmd_q
) {
1149 res
|= POLLOUT
| POLLWRNORM
;
1150 } else if (count
< SG_MAX_QUEUE
)
1151 res
|= POLLOUT
| POLLWRNORM
;
1152 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1153 sdp
->disk
->disk_name
, (int) res
));
1158 sg_fasync(int fd
, struct file
*filp
, int mode
)
1164 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1166 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1167 sdp
->disk
->disk_name
, mode
));
1169 retval
= fasync_helper(fd
, filp
, mode
, &sfp
->async_qp
);
1170 return (retval
< 0) ? retval
: 0;
1174 sg_vma_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1177 unsigned long offset
, len
, sa
;
1178 Sg_scatter_hold
*rsv_schp
;
1179 struct scatterlist
*sg
;
1182 if ((NULL
== vma
) || (!(sfp
= (Sg_fd
*) vma
->vm_private_data
)))
1183 return VM_FAULT_SIGBUS
;
1184 rsv_schp
= &sfp
->reserve
;
1185 offset
= vmf
->pgoff
<< PAGE_SHIFT
;
1186 if (offset
>= rsv_schp
->bufflen
)
1187 return VM_FAULT_SIGBUS
;
1188 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1189 offset
, rsv_schp
->k_use_sg
));
1190 sg
= rsv_schp
->buffer
;
1192 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1193 ++k
, sg
= sg_next(sg
)) {
1194 len
= vma
->vm_end
- sa
;
1195 len
= (len
< sg
->length
) ? len
: sg
->length
;
1198 page
= virt_to_page(page_address(sg_page(sg
)) + offset
);
1199 get_page(page
); /* increment page count */
1201 return 0; /* success */
1207 return VM_FAULT_SIGBUS
;
1210 static struct vm_operations_struct sg_mmap_vm_ops
= {
1211 .fault
= sg_vma_fault
,
1215 sg_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
1218 unsigned long req_sz
, len
, sa
;
1219 Sg_scatter_hold
*rsv_schp
;
1221 struct scatterlist
*sg
;
1223 if ((!filp
) || (!vma
) || (!(sfp
= (Sg_fd
*) filp
->private_data
)))
1225 req_sz
= vma
->vm_end
- vma
->vm_start
;
1226 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1227 (void *) vma
->vm_start
, (int) req_sz
));
1229 return -EINVAL
; /* want no offset */
1230 rsv_schp
= &sfp
->reserve
;
1231 if (req_sz
> rsv_schp
->bufflen
)
1232 return -ENOMEM
; /* cannot map more than reserved buffer */
1235 sg
= rsv_schp
->buffer
;
1236 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1237 ++k
, sg
= sg_next(sg
)) {
1238 len
= vma
->vm_end
- sa
;
1239 len
= (len
< sg
->length
) ? len
: sg
->length
;
1243 sfp
->mmap_called
= 1;
1244 vma
->vm_flags
|= VM_RESERVED
;
1245 vma
->vm_private_data
= sfp
;
1246 vma
->vm_ops
= &sg_mmap_vm_ops
;
1250 /* This function is a "bottom half" handler that is called by the
1251 * mid level when a command is completed (or has failed). */
1253 sg_cmd_done(void *data
, char *sense
, int result
, int resid
)
1255 Sg_request
*srp
= data
;
1256 Sg_device
*sdp
= NULL
;
1258 unsigned long iflags
;
1262 printk(KERN_ERR
"sg_cmd_done: NULL request\n");
1265 sfp
= srp
->parentfp
;
1267 sdp
= sfp
->parentdp
;
1268 if ((NULL
== sdp
) || sdp
->detached
) {
1269 printk(KERN_INFO
"sg_cmd_done: device detached\n");
1274 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1275 sdp
->disk
->disk_name
, srp
->header
.pack_id
, result
));
1276 srp
->header
.resid
= resid
;
1277 ms
= jiffies_to_msecs(jiffies
);
1278 srp
->header
.duration
= (ms
> srp
->header
.duration
) ?
1279 (ms
- srp
->header
.duration
) : 0;
1281 struct scsi_sense_hdr sshdr
;
1283 memcpy(srp
->sense_b
, sense
, sizeof (srp
->sense_b
));
1284 srp
->header
.status
= 0xff & result
;
1285 srp
->header
.masked_status
= status_byte(result
);
1286 srp
->header
.msg_status
= msg_byte(result
);
1287 srp
->header
.host_status
= host_byte(result
);
1288 srp
->header
.driver_status
= driver_byte(result
);
1289 if ((sdp
->sgdebug
> 0) &&
1290 ((CHECK_CONDITION
== srp
->header
.masked_status
) ||
1291 (COMMAND_TERMINATED
== srp
->header
.masked_status
)))
1292 __scsi_print_sense("sg_cmd_done", sense
,
1293 SCSI_SENSE_BUFFERSIZE
);
1295 /* Following if statement is a patch supplied by Eric Youngdale */
1296 if (driver_byte(result
) != 0
1297 && scsi_normalize_sense(sense
, SCSI_SENSE_BUFFERSIZE
, &sshdr
)
1298 && !scsi_sense_is_deferred(&sshdr
)
1299 && sshdr
.sense_key
== UNIT_ATTENTION
1300 && sdp
->device
->removable
) {
1301 /* Detected possible disc change. Set the bit - this */
1302 /* may be used if there are filesystems using this device */
1303 sdp
->device
->changed
= 1;
1306 /* Rely on write phase to clean out srp status values, so no "else" */
1308 if (sfp
->closed
) { /* whoops this fd already released, cleanup */
1309 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1310 sg_finish_rem_req(srp
);
1312 if (NULL
== sfp
->headrp
) {
1313 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1314 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* device still present */
1315 scsi_device_put(sdp
->device
);
1319 } else if (srp
&& srp
->orphan
) {
1320 if (sfp
->keep_orphan
)
1321 srp
->sg_io_owned
= 0;
1323 sg_finish_rem_req(srp
);
1328 /* Now wake up any sg_read() that is waiting for this packet. */
1329 kill_fasync(&sfp
->async_qp
, SIGPOLL
, POLL_IN
);
1330 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1332 wake_up_interruptible(&sfp
->read_wait
);
1333 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1337 static struct file_operations sg_fops
= {
1338 .owner
= THIS_MODULE
,
1343 #ifdef CONFIG_COMPAT
1344 .compat_ioctl
= sg_compat_ioctl
,
1348 .release
= sg_release
,
1349 .fasync
= sg_fasync
,
1352 static struct class *sg_sysfs_class
;
1354 static int sg_sysfs_valid
= 0;
1356 static Sg_device
*sg_alloc(struct gendisk
*disk
, struct scsi_device
*scsidp
)
1358 struct request_queue
*q
= scsidp
->request_queue
;
1360 unsigned long iflags
;
1364 sdp
= kzalloc(sizeof(Sg_device
), GFP_KERNEL
);
1366 printk(KERN_WARNING
"kmalloc Sg_device failure\n");
1367 return ERR_PTR(-ENOMEM
);
1370 if (!idr_pre_get(&sg_index_idr
, GFP_KERNEL
)) {
1371 printk(KERN_WARNING
"idr expansion Sg_device failure\n");
1375 write_lock_irqsave(&sg_index_lock
, iflags
);
1376 error
= idr_get_new(&sg_index_idr
, sdp
, &k
);
1377 write_unlock_irqrestore(&sg_index_lock
, iflags
);
1380 printk(KERN_WARNING
"idr allocation Sg_device failure: %d\n",
1385 if (unlikely(k
>= SG_MAX_DEVS
))
1388 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k
));
1389 sprintf(disk
->disk_name
, "sg%d", k
);
1390 disk
->first_minor
= k
;
1392 sdp
->device
= scsidp
;
1393 init_waitqueue_head(&sdp
->o_excl_wait
);
1394 sdp
->sg_tablesize
= min(q
->max_hw_segments
, q
->max_phys_segments
);
1401 return ERR_PTR(error
);
1406 sdev_printk(KERN_WARNING
, scsidp
,
1407 "Unable to attach sg device type=%d, minor "
1408 "number exceeds %d\n", scsidp
->type
, SG_MAX_DEVS
- 1);
1414 sg_add(struct device
*cl_dev
, struct class_interface
*cl_intf
)
1416 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->parent
);
1417 struct gendisk
*disk
;
1418 Sg_device
*sdp
= NULL
;
1419 struct cdev
* cdev
= NULL
;
1421 unsigned long iflags
;
1423 disk
= alloc_disk(1);
1425 printk(KERN_WARNING
"alloc_disk failed\n");
1428 disk
->major
= SCSI_GENERIC_MAJOR
;
1431 cdev
= cdev_alloc();
1433 printk(KERN_WARNING
"cdev_alloc failed\n");
1436 cdev
->owner
= THIS_MODULE
;
1437 cdev
->ops
= &sg_fops
;
1439 sdp
= sg_alloc(disk
, scsidp
);
1441 printk(KERN_WARNING
"sg_alloc failed\n");
1442 error
= PTR_ERR(sdp
);
1446 error
= cdev_add(cdev
, MKDEV(SCSI_GENERIC_MAJOR
, sdp
->index
), 1);
1451 if (sg_sysfs_valid
) {
1452 struct device
*sg_class_member
;
1454 sg_class_member
= device_create_drvdata(sg_sysfs_class
,
1456 MKDEV(SCSI_GENERIC_MAJOR
,
1459 "%s", disk
->disk_name
);
1460 if (IS_ERR(sg_class_member
)) {
1461 printk(KERN_ERR
"sg_add: "
1462 "device_create failed\n");
1463 error
= PTR_ERR(sg_class_member
);
1466 error
= sysfs_create_link(&scsidp
->sdev_gendev
.kobj
,
1467 &sg_class_member
->kobj
, "generic");
1469 printk(KERN_ERR
"sg_add: unable to make symlink "
1470 "'generic' back to sg%d\n", sdp
->index
);
1472 printk(KERN_WARNING
"sg_add: sg_sys Invalid\n");
1474 sdev_printk(KERN_NOTICE
, scsidp
,
1475 "Attached scsi generic sg%d type %d\n", sdp
->index
,
1478 dev_set_drvdata(cl_dev
, sdp
);
1483 write_lock_irqsave(&sg_index_lock
, iflags
);
1484 idr_remove(&sg_index_idr
, sdp
->index
);
1485 write_unlock_irqrestore(&sg_index_lock
, iflags
);
1496 sg_remove(struct device
*cl_dev
, struct class_interface
*cl_intf
)
1498 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->parent
);
1499 Sg_device
*sdp
= dev_get_drvdata(cl_dev
);
1500 unsigned long iflags
;
1511 write_lock_irqsave(&sg_index_lock
, iflags
);
1514 for (sfp
= sdp
->headfp
; sfp
; sfp
= tsfp
) {
1516 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
1518 if (sfp
->closed
|| (0 == sg_srp_done(srp
, sfp
)))
1519 sg_finish_rem_req(srp
);
1522 scsi_device_put(sdp
->device
);
1523 __sg_remove_sfp(sdp
, sfp
);
1526 wake_up_interruptible(&sfp
->read_wait
);
1527 kill_fasync(&sfp
->async_qp
, SIGPOLL
,
1531 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp
->index
));
1532 if (NULL
== sdp
->headfp
) {
1533 idr_remove(&sg_index_idr
, sdp
->index
);
1535 } else { /* nothing active, simple case */
1536 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp
->index
));
1537 idr_remove(&sg_index_idr
, sdp
->index
);
1539 write_unlock_irqrestore(&sg_index_lock
, iflags
);
1541 sysfs_remove_link(&scsidp
->sdev_gendev
.kobj
, "generic");
1542 device_destroy(sg_sysfs_class
, MKDEV(SCSI_GENERIC_MAJOR
, sdp
->index
));
1543 cdev_del(sdp
->cdev
);
1545 put_disk(sdp
->disk
);
1547 if (NULL
== sdp
->headfp
)
1551 msleep(10); /* dirty detach so delay device destruction */
1554 module_param_named(scatter_elem_sz
, scatter_elem_sz
, int, S_IRUGO
| S_IWUSR
);
1555 module_param_named(def_reserved_size
, def_reserved_size
, int,
1557 module_param_named(allow_dio
, sg_allow_dio
, int, S_IRUGO
| S_IWUSR
);
1559 MODULE_AUTHOR("Douglas Gilbert");
1560 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1561 MODULE_LICENSE("GPL");
1562 MODULE_VERSION(SG_VERSION_STR
);
1563 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR
);
1565 MODULE_PARM_DESC(scatter_elem_sz
, "scatter gather element "
1566 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1567 MODULE_PARM_DESC(def_reserved_size
, "size of buffer reserved for each fd");
1568 MODULE_PARM_DESC(allow_dio
, "allow direct I/O (default: 0 (disallow))");
1575 if (scatter_elem_sz
< PAGE_SIZE
) {
1576 scatter_elem_sz
= PAGE_SIZE
;
1577 scatter_elem_sz_prev
= scatter_elem_sz
;
1579 if (def_reserved_size
>= 0)
1580 sg_big_buff
= def_reserved_size
;
1582 def_reserved_size
= sg_big_buff
;
1584 rc
= register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1588 sg_sysfs_class
= class_create(THIS_MODULE
, "scsi_generic");
1589 if ( IS_ERR(sg_sysfs_class
) ) {
1590 rc
= PTR_ERR(sg_sysfs_class
);
1594 rc
= scsi_register_interface(&sg_interface
);
1596 #ifdef CONFIG_SCSI_PROC_FS
1598 #endif /* CONFIG_SCSI_PROC_FS */
1601 class_destroy(sg_sysfs_class
);
1603 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0), SG_MAX_DEVS
);
1610 #ifdef CONFIG_SCSI_PROC_FS
1612 #endif /* CONFIG_SCSI_PROC_FS */
1613 scsi_unregister_interface(&sg_interface
);
1614 class_destroy(sg_sysfs_class
);
1616 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1618 idr_destroy(&sg_index_idr
);
1622 sg_start_req(Sg_request
* srp
)
1625 Sg_fd
*sfp
= srp
->parentfp
;
1626 sg_io_hdr_t
*hp
= &srp
->header
;
1627 int dxfer_len
= (int) hp
->dxfer_len
;
1628 int dxfer_dir
= hp
->dxfer_direction
;
1629 Sg_scatter_hold
*req_schp
= &srp
->data
;
1630 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
1632 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len
));
1633 if ((dxfer_len
<= 0) || (dxfer_dir
== SG_DXFER_NONE
))
1635 if (sg_allow_dio
&& (hp
->flags
& SG_FLAG_DIRECT_IO
) &&
1636 (dxfer_dir
!= SG_DXFER_UNKNOWN
) && (0 == hp
->iovec_count
) &&
1637 (!sfp
->parentdp
->device
->host
->unchecked_isa_dma
)) {
1638 res
= sg_build_direct(srp
, sfp
, dxfer_len
);
1639 if (res
<= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1642 if ((!sg_res_in_use(sfp
)) && (dxfer_len
<= rsv_schp
->bufflen
))
1643 sg_link_reserve(sfp
, srp
, dxfer_len
);
1645 res
= sg_build_indirect(req_schp
, sfp
, dxfer_len
);
1647 sg_remove_scat(req_schp
);
1655 sg_finish_rem_req(Sg_request
* srp
)
1657 Sg_fd
*sfp
= srp
->parentfp
;
1658 Sg_scatter_hold
*req_schp
= &srp
->data
;
1660 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp
->res_used
));
1662 sg_unlink_reserve(sfp
, srp
);
1664 sg_remove_scat(req_schp
);
1665 sg_remove_request(sfp
, srp
);
1669 sg_build_sgat(Sg_scatter_hold
* schp
, const Sg_fd
* sfp
, int tablesize
)
1671 int sg_bufflen
= tablesize
* sizeof(struct scatterlist
);
1672 gfp_t gfp_flags
= GFP_ATOMIC
| __GFP_NOWARN
;
1675 * TODO: test without low_dma, we should not need it since
1676 * the block layer will bounce the buffer for us
1678 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1681 gfp_flags
|= GFP_DMA
;
1682 schp
->buffer
= kzalloc(sg_bufflen
, gfp_flags
);
1685 sg_init_table(schp
->buffer
, tablesize
);
1686 schp
->sglist_len
= sg_bufflen
;
1687 return tablesize
; /* number of scat_gath elements allocated */
1690 #ifdef SG_ALLOW_DIO_CODE
1691 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1692 /* TODO: hopefully we can use the generic block layer code */
1694 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1695 - mapping of all pages not successful
1696 (i.e., either completely successful or fails)
1699 st_map_user_pages(struct scatterlist
*sgl
, const unsigned int max_pages
,
1700 unsigned long uaddr
, size_t count
, int rw
)
1702 unsigned long end
= (uaddr
+ count
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
1703 unsigned long start
= uaddr
>> PAGE_SHIFT
;
1704 const int nr_pages
= end
- start
;
1706 struct page
**pages
;
1708 /* User attempted Overflow! */
1709 if ((uaddr
+ count
) < uaddr
)
1713 if (nr_pages
> max_pages
)
1720 if ((pages
= kmalloc(max_pages
* sizeof(*pages
), GFP_ATOMIC
)) == NULL
)
1723 /* Try to fault in all of the necessary pages */
1724 down_read(¤t
->mm
->mmap_sem
);
1725 /* rw==READ means read from drive, write into memory area */
1726 res
= get_user_pages(
1732 0, /* don't force */
1735 up_read(¤t
->mm
->mmap_sem
);
1737 /* Errors and no page mapped should return here */
1741 for (i
=0; i
< nr_pages
; i
++) {
1742 /* FIXME: flush superflous for rw==READ,
1743 * probably wrong function for rw==WRITE
1745 flush_dcache_page(pages
[i
]);
1746 /* ?? Is locking needed? I don't think so */
1747 /* if (TestSetPageLocked(pages[i]))
1751 sg_set_page(sgl
, pages
[0], 0, uaddr
& ~PAGE_MASK
);
1753 sgl
[0].length
= PAGE_SIZE
- sgl
[0].offset
;
1754 count
-= sgl
[0].length
;
1755 for (i
=1; i
< nr_pages
; i
++)
1756 sg_set_page(&sgl
[i
], pages
[i
], count
< PAGE_SIZE
? count
: PAGE_SIZE
, 0);
1759 sgl
[0].length
= count
;
1767 for (j
=0; j
< res
; j
++)
1768 page_cache_release(pages
[j
]);
1776 /* And unmap them... */
1778 st_unmap_user_pages(struct scatterlist
*sgl
, const unsigned int nr_pages
,
1783 for (i
=0; i
< nr_pages
; i
++) {
1784 struct page
*page
= sg_page(&sgl
[i
]);
1788 /* unlock_page(page); */
1789 /* FIXME: cache flush missing for rw==READ
1790 * FIXME: call the correct reference counting function
1792 page_cache_release(page
);
1798 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1802 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1804 sg_build_direct(Sg_request
* srp
, Sg_fd
* sfp
, int dxfer_len
)
1806 #ifdef SG_ALLOW_DIO_CODE
1807 sg_io_hdr_t
*hp
= &srp
->header
;
1808 Sg_scatter_hold
*schp
= &srp
->data
;
1809 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1810 int mx_sc_elems
, res
;
1811 struct scsi_device
*sdev
= sfp
->parentdp
->device
;
1813 if (((unsigned long)hp
->dxferp
&
1814 queue_dma_alignment(sdev
->request_queue
)) != 0)
1817 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1818 if (mx_sc_elems
<= 0) {
1821 res
= st_map_user_pages(schp
->buffer
, mx_sc_elems
,
1822 (unsigned long)hp
->dxferp
, dxfer_len
,
1823 (SG_DXFER_TO_DEV
== hp
->dxfer_direction
) ? 1 : 0);
1825 sg_remove_scat(schp
);
1828 schp
->k_use_sg
= res
;
1829 schp
->dio_in_use
= 1;
1830 hp
->info
|= SG_INFO_DIRECT_IO
;
1838 sg_build_indirect(Sg_scatter_hold
* schp
, Sg_fd
* sfp
, int buff_size
)
1840 struct scatterlist
*sg
;
1841 int ret_sz
= 0, k
, rem_sz
, num
, mx_sc_elems
;
1842 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1843 int blk_size
= buff_size
;
1844 struct page
*p
= NULL
;
1849 ++blk_size
; /* don't know why */
1850 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1851 blk_size
= (blk_size
+ SG_SECTOR_MSK
) & (~SG_SECTOR_MSK
);
1852 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1853 buff_size
, blk_size
));
1855 /* N.B. ret_sz carried into this block ... */
1856 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1857 if (mx_sc_elems
< 0)
1858 return mx_sc_elems
; /* most likely -ENOMEM */
1860 num
= scatter_elem_sz
;
1861 if (unlikely(num
!= scatter_elem_sz_prev
)) {
1862 if (num
< PAGE_SIZE
) {
1863 scatter_elem_sz
= PAGE_SIZE
;
1864 scatter_elem_sz_prev
= PAGE_SIZE
;
1866 scatter_elem_sz_prev
= num
;
1868 for (k
= 0, sg
= schp
->buffer
, rem_sz
= blk_size
;
1869 (rem_sz
> 0) && (k
< mx_sc_elems
);
1870 ++k
, rem_sz
-= ret_sz
, sg
= sg_next(sg
)) {
1872 num
= (rem_sz
> scatter_elem_sz_prev
) ?
1873 scatter_elem_sz_prev
: rem_sz
;
1874 p
= sg_page_malloc(num
, sfp
->low_dma
, &ret_sz
);
1878 if (num
== scatter_elem_sz_prev
) {
1879 if (unlikely(ret_sz
> scatter_elem_sz_prev
)) {
1880 scatter_elem_sz
= ret_sz
;
1881 scatter_elem_sz_prev
= ret_sz
;
1884 sg_set_page(sg
, p
, (ret_sz
> num
) ? num
: ret_sz
, 0);
1886 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1887 "ret_sz=%d\n", k
, num
, ret_sz
));
1888 } /* end of for loop */
1891 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1892 "rem_sz=%d\n", k
, rem_sz
));
1894 schp
->bufflen
= blk_size
;
1895 if (rem_sz
> 0) /* must have failed */
1902 sg_write_xfer(Sg_request
* srp
)
1904 sg_io_hdr_t
*hp
= &srp
->header
;
1905 Sg_scatter_hold
*schp
= &srp
->data
;
1906 struct scatterlist
*sg
= schp
->buffer
;
1908 int j
, k
, onum
, usglen
, ksglen
, res
;
1909 int iovec_count
= (int) hp
->iovec_count
;
1910 int dxfer_dir
= hp
->dxfer_direction
;
1912 unsigned char __user
*up
;
1913 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
1915 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_TO_DEV
== dxfer_dir
) ||
1916 (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
1917 num_xfer
= (int) (new_interface
? hp
->dxfer_len
: hp
->flags
);
1918 if (schp
->bufflen
< num_xfer
)
1919 num_xfer
= schp
->bufflen
;
1921 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
1923 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
1926 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1927 num_xfer
, iovec_count
, schp
->k_use_sg
));
1930 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
1935 ksglen
= sg
->length
;
1936 p
= page_address(sg_page(sg
));
1937 for (j
= 0, k
= 0; j
< onum
; ++j
) {
1938 res
= sg_u_iovec(hp
, iovec_count
, j
, 1, &usglen
, &up
);
1942 for (; p
; sg
= sg_next(sg
), ksglen
= sg
->length
,
1943 p
= page_address(sg_page(sg
))) {
1946 if (ksglen
> usglen
) {
1947 if (usglen
>= num_xfer
) {
1948 if (__copy_from_user(p
, up
, num_xfer
))
1952 if (__copy_from_user(p
, up
, usglen
))
1958 if (ksglen
>= num_xfer
) {
1959 if (__copy_from_user(p
, up
, num_xfer
))
1963 if (__copy_from_user(p
, up
, ksglen
))
1969 if (k
>= schp
->k_use_sg
)
1978 sg_u_iovec(sg_io_hdr_t
* hp
, int sg_num
, int ind
,
1979 int wr_xf
, int *countp
, unsigned char __user
**up
)
1981 int num_xfer
= (int) hp
->dxfer_len
;
1982 unsigned char __user
*p
= hp
->dxferp
;
1986 if (wr_xf
&& ('\0' == hp
->interface_id
))
1987 count
= (int) hp
->flags
; /* holds "old" input_size */
1992 if (__copy_from_user(&iovec
, p
+ ind
*SZ_SG_IOVEC
, SZ_SG_IOVEC
))
1995 count
= (int) iovec
.iov_len
;
1997 if (!access_ok(wr_xf
? VERIFY_READ
: VERIFY_WRITE
, p
, count
))
2007 sg_remove_scat(Sg_scatter_hold
* schp
)
2009 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp
->k_use_sg
));
2010 if (schp
->buffer
&& (schp
->sglist_len
> 0)) {
2011 struct scatterlist
*sg
= schp
->buffer
;
2013 if (schp
->dio_in_use
) {
2014 #ifdef SG_ALLOW_DIO_CODE
2015 st_unmap_user_pages(sg
, schp
->k_use_sg
, TRUE
);
2020 for (k
= 0; (k
< schp
->k_use_sg
) && sg_page(sg
);
2021 ++k
, sg
= sg_next(sg
)) {
2022 SCSI_LOG_TIMEOUT(5, printk(
2023 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
2024 k
, sg_page(sg
), sg
->length
));
2025 sg_page_free(sg_page(sg
), sg
->length
);
2028 kfree(schp
->buffer
);
2030 memset(schp
, 0, sizeof (*schp
));
2034 sg_read_xfer(Sg_request
* srp
)
2036 sg_io_hdr_t
*hp
= &srp
->header
;
2037 Sg_scatter_hold
*schp
= &srp
->data
;
2038 struct scatterlist
*sg
= schp
->buffer
;
2040 int j
, k
, onum
, usglen
, ksglen
, res
;
2041 int iovec_count
= (int) hp
->iovec_count
;
2042 int dxfer_dir
= hp
->dxfer_direction
;
2044 unsigned char __user
*up
;
2045 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
2047 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_FROM_DEV
== dxfer_dir
)
2048 || (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
2049 num_xfer
= hp
->dxfer_len
;
2050 if (schp
->bufflen
< num_xfer
)
2051 num_xfer
= schp
->bufflen
;
2053 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
2055 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
2058 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2059 num_xfer
, iovec_count
, schp
->k_use_sg
));
2062 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
2067 p
= page_address(sg_page(sg
));
2068 ksglen
= sg
->length
;
2069 for (j
= 0, k
= 0; j
< onum
; ++j
) {
2070 res
= sg_u_iovec(hp
, iovec_count
, j
, 0, &usglen
, &up
);
2074 for (; p
; sg
= sg_next(sg
), ksglen
= sg
->length
,
2075 p
= page_address(sg_page(sg
))) {
2078 if (ksglen
> usglen
) {
2079 if (usglen
>= num_xfer
) {
2080 if (__copy_to_user(up
, p
, num_xfer
))
2084 if (__copy_to_user(up
, p
, usglen
))
2090 if (ksglen
>= num_xfer
) {
2091 if (__copy_to_user(up
, p
, num_xfer
))
2095 if (__copy_to_user(up
, p
, ksglen
))
2101 if (k
>= schp
->k_use_sg
)
2110 sg_read_oxfer(Sg_request
* srp
, char __user
*outp
, int num_read_xfer
)
2112 Sg_scatter_hold
*schp
= &srp
->data
;
2113 struct scatterlist
*sg
= schp
->buffer
;
2116 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2118 if ((!outp
) || (num_read_xfer
<= 0))
2121 for (k
= 0; (k
< schp
->k_use_sg
) && sg_page(sg
); ++k
, sg
= sg_next(sg
)) {
2123 if (num
> num_read_xfer
) {
2124 if (__copy_to_user(outp
, page_address(sg_page(sg
)),
2129 if (__copy_to_user(outp
, page_address(sg_page(sg
)),
2132 num_read_xfer
-= num
;
2133 if (num_read_xfer
<= 0)
2143 sg_build_reserve(Sg_fd
* sfp
, int req_size
)
2145 Sg_scatter_hold
*schp
= &sfp
->reserve
;
2147 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size
));
2149 if (req_size
< PAGE_SIZE
)
2150 req_size
= PAGE_SIZE
;
2151 if (0 == sg_build_indirect(schp
, sfp
, req_size
))
2154 sg_remove_scat(schp
);
2155 req_size
>>= 1; /* divide by 2 */
2156 } while (req_size
> (PAGE_SIZE
/ 2));
2160 sg_link_reserve(Sg_fd
* sfp
, Sg_request
* srp
, int size
)
2162 Sg_scatter_hold
*req_schp
= &srp
->data
;
2163 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2164 struct scatterlist
*sg
= rsv_schp
->buffer
;
2168 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size
));
2171 for (k
= 0; k
< rsv_schp
->k_use_sg
; ++k
, sg
= sg_next(sg
)) {
2174 sfp
->save_scat_len
= num
;
2176 req_schp
->k_use_sg
= k
+ 1;
2177 req_schp
->sglist_len
= rsv_schp
->sglist_len
;
2178 req_schp
->buffer
= rsv_schp
->buffer
;
2180 req_schp
->bufflen
= size
;
2181 req_schp
->b_malloc_len
= rsv_schp
->b_malloc_len
;
2187 if (k
>= rsv_schp
->k_use_sg
)
2188 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2192 sg_unlink_reserve(Sg_fd
* sfp
, Sg_request
* srp
)
2194 Sg_scatter_hold
*req_schp
= &srp
->data
;
2195 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2197 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2198 (int) req_schp
->k_use_sg
));
2199 if ((rsv_schp
->k_use_sg
> 0) && (req_schp
->k_use_sg
> 0)) {
2200 struct scatterlist
*sg
= rsv_schp
->buffer
;
2202 if (sfp
->save_scat_len
> 0)
2203 (sg
+ (req_schp
->k_use_sg
- 1))->length
=
2204 (unsigned) sfp
->save_scat_len
;
2206 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2208 req_schp
->k_use_sg
= 0;
2209 req_schp
->bufflen
= 0;
2210 req_schp
->buffer
= NULL
;
2211 req_schp
->sglist_len
= 0;
2212 sfp
->save_scat_len
= 0;
2217 sg_get_rq_mark(Sg_fd
* sfp
, int pack_id
)
2220 unsigned long iflags
;
2222 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2223 for (resp
= sfp
->headrp
; resp
; resp
= resp
->nextrp
) {
2224 /* look for requests that are ready + not SG_IO owned */
2225 if ((1 == resp
->done
) && (!resp
->sg_io_owned
) &&
2226 ((-1 == pack_id
) || (resp
->header
.pack_id
== pack_id
))) {
2227 resp
->done
= 2; /* guard against other readers */
2231 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2235 #ifdef CONFIG_SCSI_PROC_FS
2237 sg_get_nth_request(Sg_fd
* sfp
, int nth
)
2240 unsigned long iflags
;
2243 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2244 for (k
= 0, resp
= sfp
->headrp
; resp
&& (k
< nth
);
2245 ++k
, resp
= resp
->nextrp
) ;
2246 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2251 /* always adds to end of list */
2253 sg_add_request(Sg_fd
* sfp
)
2256 unsigned long iflags
;
2258 Sg_request
*rp
= sfp
->req_arr
;
2260 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2263 memset(rp
, 0, sizeof (Sg_request
));
2268 if (0 == sfp
->cmd_q
)
2269 resp
= NULL
; /* command queuing disallowed */
2271 for (k
= 0; k
< SG_MAX_QUEUE
; ++k
, ++rp
) {
2275 if (k
< SG_MAX_QUEUE
) {
2276 memset(rp
, 0, sizeof (Sg_request
));
2278 while (resp
->nextrp
)
2279 resp
= resp
->nextrp
;
2287 resp
->nextrp
= NULL
;
2288 resp
->header
.duration
= jiffies_to_msecs(jiffies
);
2290 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2294 /* Return of 1 for found; 0 for not found */
2296 sg_remove_request(Sg_fd
* sfp
, Sg_request
* srp
)
2298 Sg_request
*prev_rp
;
2300 unsigned long iflags
;
2303 if ((!sfp
) || (!srp
) || (!sfp
->headrp
))
2305 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2306 prev_rp
= sfp
->headrp
;
2307 if (srp
== prev_rp
) {
2308 sfp
->headrp
= prev_rp
->nextrp
;
2309 prev_rp
->parentfp
= NULL
;
2312 while ((rp
= prev_rp
->nextrp
)) {
2314 prev_rp
->nextrp
= rp
->nextrp
;
2315 rp
->parentfp
= NULL
;
2322 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2326 #ifdef CONFIG_SCSI_PROC_FS
2328 sg_get_nth_sfp(Sg_device
* sdp
, int nth
)
2331 unsigned long iflags
;
2334 read_lock_irqsave(&sg_index_lock
, iflags
);
2335 for (k
= 0, resp
= sdp
->headfp
; resp
&& (k
< nth
);
2336 ++k
, resp
= resp
->nextfp
) ;
2337 read_unlock_irqrestore(&sg_index_lock
, iflags
);
2343 sg_add_sfp(Sg_device
* sdp
, int dev
)
2346 unsigned long iflags
;
2349 sfp
= kzalloc(sizeof(*sfp
), GFP_ATOMIC
| __GFP_NOWARN
);
2353 init_waitqueue_head(&sfp
->read_wait
);
2354 rwlock_init(&sfp
->rq_list_lock
);
2356 sfp
->timeout
= SG_DEFAULT_TIMEOUT
;
2357 sfp
->timeout_user
= SG_DEFAULT_TIMEOUT_USER
;
2358 sfp
->force_packid
= SG_DEF_FORCE_PACK_ID
;
2359 sfp
->low_dma
= (SG_DEF_FORCE_LOW_DMA
== 0) ?
2360 sdp
->device
->host
->unchecked_isa_dma
: 1;
2361 sfp
->cmd_q
= SG_DEF_COMMAND_Q
;
2362 sfp
->keep_orphan
= SG_DEF_KEEP_ORPHAN
;
2363 sfp
->parentdp
= sdp
;
2364 write_lock_irqsave(&sg_index_lock
, iflags
);
2367 else { /* add to tail of existing list */
2368 Sg_fd
*pfp
= sdp
->headfp
;
2373 write_unlock_irqrestore(&sg_index_lock
, iflags
);
2374 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp
));
2375 if (unlikely(sg_big_buff
!= def_reserved_size
))
2376 sg_big_buff
= def_reserved_size
;
2378 bufflen
= min_t(int, sg_big_buff
,
2379 sdp
->device
->request_queue
->max_sectors
* 512);
2380 sg_build_reserve(sfp
, bufflen
);
2381 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2382 sfp
->reserve
.bufflen
, sfp
->reserve
.k_use_sg
));
2387 __sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2392 prev_fp
= sdp
->headfp
;
2394 sdp
->headfp
= prev_fp
->nextfp
;
2396 while ((fp
= prev_fp
->nextfp
)) {
2398 prev_fp
->nextfp
= fp
->nextfp
;
2404 if (sfp
->reserve
.bufflen
> 0) {
2406 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2407 (int) sfp
->reserve
.bufflen
, (int) sfp
->reserve
.k_use_sg
));
2408 sg_remove_scat(&sfp
->reserve
);
2410 sfp
->parentdp
= NULL
;
2411 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp
));
2415 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2417 sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2424 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
2426 if (sg_srp_done(srp
, sfp
))
2427 sg_finish_rem_req(srp
);
2432 unsigned long iflags
;
2434 write_lock_irqsave(&sg_index_lock
, iflags
);
2435 __sg_remove_sfp(sdp
, sfp
);
2436 if (sdp
->detached
&& (NULL
== sdp
->headfp
)) {
2437 idr_remove(&sg_index_idr
, sdp
->index
);
2441 write_unlock_irqrestore(&sg_index_lock
, iflags
);
2443 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2444 /* only bump the access_count if we actually succeeded in
2445 * throwing another counter on the host module */
2446 scsi_device_get(sdp
->device
); /* XXX: retval ignored? */
2447 sfp
->closed
= 1; /* flag dirty state on this fd */
2448 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2455 sg_res_in_use(Sg_fd
* sfp
)
2457 const Sg_request
*srp
;
2458 unsigned long iflags
;
2460 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2461 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
)
2464 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2468 /* The size fetched (value output via retSzp) set when non-NULL return */
2469 static struct page
*
2470 sg_page_malloc(int rqSz
, int lowDma
, int *retSzp
)
2472 struct page
*resp
= NULL
;
2477 if ((rqSz
<= 0) || (NULL
== retSzp
))
2481 page_mask
= GFP_ATOMIC
| GFP_DMA
| __GFP_COMP
| __GFP_NOWARN
;
2483 page_mask
= GFP_ATOMIC
| __GFP_COMP
| __GFP_NOWARN
;
2485 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< rqSz
;
2486 order
++, a_size
<<= 1) ;
2487 resSz
= a_size
; /* rounded up if necessary */
2488 resp
= alloc_pages(page_mask
, order
);
2489 while ((!resp
) && order
) {
2491 a_size
>>= 1; /* divide by 2, until PAGE_SIZE */
2492 resp
= alloc_pages(page_mask
, order
); /* try half */
2496 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2497 memset(page_address(resp
), 0, resSz
);
2504 sg_page_free(struct page
*page
, int size
)
2510 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< size
;
2511 order
++, a_size
<<= 1) ;
2512 __free_pages(page
, order
);
2515 #ifdef CONFIG_SCSI_PROC_FS
2517 sg_idr_max_id(int id
, void *p
, void *data
)
2531 unsigned long iflags
;
2533 read_lock_irqsave(&sg_index_lock
, iflags
);
2534 idr_for_each(&sg_index_idr
, sg_idr_max_id
, &k
);
2535 read_unlock_irqrestore(&sg_index_lock
, iflags
);
2536 return k
+ 1; /* origin 1 */
2544 unsigned long iflags
;
2546 read_lock_irqsave(&sg_index_lock
, iflags
);
2547 sdp
= idr_find(&sg_index_idr
, dev
);
2548 read_unlock_irqrestore(&sg_index_lock
, iflags
);
2553 #ifdef CONFIG_SCSI_PROC_FS
2555 static struct proc_dir_entry
*sg_proc_sgp
= NULL
;
2557 static char sg_proc_sg_dirname
[] = "scsi/sg";
2559 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
);
2561 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
);
2562 static ssize_t
sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2563 size_t count
, loff_t
*off
);
2564 static struct file_operations adio_fops
= {
2565 /* .owner, .read and .llseek added in sg_proc_init() */
2566 .open
= sg_proc_single_open_adio
,
2567 .write
= sg_proc_write_adio
,
2568 .release
= single_release
,
2571 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
);
2572 static ssize_t
sg_proc_write_dressz(struct file
*filp
,
2573 const char __user
*buffer
, size_t count
, loff_t
*off
);
2574 static struct file_operations dressz_fops
= {
2575 .open
= sg_proc_single_open_dressz
,
2576 .write
= sg_proc_write_dressz
,
2577 .release
= single_release
,
2580 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
);
2581 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
);
2582 static struct file_operations version_fops
= {
2583 .open
= sg_proc_single_open_version
,
2584 .release
= single_release
,
2587 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
);
2588 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
);
2589 static struct file_operations devhdr_fops
= {
2590 .open
= sg_proc_single_open_devhdr
,
2591 .release
= single_release
,
2594 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
);
2595 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
);
2596 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
);
2597 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
);
2598 static void dev_seq_stop(struct seq_file
*s
, void *v
);
2599 static struct file_operations dev_fops
= {
2600 .open
= sg_proc_open_dev
,
2601 .release
= seq_release
,
2603 static struct seq_operations dev_seq_ops
= {
2604 .start
= dev_seq_start
,
2605 .next
= dev_seq_next
,
2606 .stop
= dev_seq_stop
,
2607 .show
= sg_proc_seq_show_dev
,
2610 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
);
2611 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
);
2612 static struct file_operations devstrs_fops
= {
2613 .open
= sg_proc_open_devstrs
,
2614 .release
= seq_release
,
2616 static struct seq_operations devstrs_seq_ops
= {
2617 .start
= dev_seq_start
,
2618 .next
= dev_seq_next
,
2619 .stop
= dev_seq_stop
,
2620 .show
= sg_proc_seq_show_devstrs
,
2623 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
);
2624 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
);
2625 static struct file_operations debug_fops
= {
2626 .open
= sg_proc_open_debug
,
2627 .release
= seq_release
,
2629 static struct seq_operations debug_seq_ops
= {
2630 .start
= dev_seq_start
,
2631 .next
= dev_seq_next
,
2632 .stop
= dev_seq_stop
,
2633 .show
= sg_proc_seq_show_debug
,
2637 struct sg_proc_leaf
{
2639 struct file_operations
* fops
;
2642 static struct sg_proc_leaf sg_proc_leaf_arr
[] = {
2643 {"allow_dio", &adio_fops
},
2644 {"debug", &debug_fops
},
2645 {"def_reserved_size", &dressz_fops
},
2646 {"device_hdr", &devhdr_fops
},
2647 {"devices", &dev_fops
},
2648 {"device_strs", &devstrs_fops
},
2649 {"version", &version_fops
}
2656 int num_leaves
= ARRAY_SIZE(sg_proc_leaf_arr
);
2657 struct sg_proc_leaf
* leaf
;
2659 sg_proc_sgp
= proc_mkdir(sg_proc_sg_dirname
, NULL
);
2662 for (k
= 0; k
< num_leaves
; ++k
) {
2663 leaf
= &sg_proc_leaf_arr
[k
];
2664 mask
= leaf
->fops
->write
? S_IRUGO
| S_IWUSR
: S_IRUGO
;
2665 leaf
->fops
->owner
= THIS_MODULE
;
2666 leaf
->fops
->read
= seq_read
;
2667 leaf
->fops
->llseek
= seq_lseek
;
2668 proc_create(leaf
->name
, mask
, sg_proc_sgp
, leaf
->fops
);
2674 sg_proc_cleanup(void)
2677 int num_leaves
= ARRAY_SIZE(sg_proc_leaf_arr
);
2681 for (k
= 0; k
< num_leaves
; ++k
)
2682 remove_proc_entry(sg_proc_leaf_arr
[k
].name
, sg_proc_sgp
);
2683 remove_proc_entry(sg_proc_sg_dirname
, NULL
);
2687 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
)
2689 seq_printf(s
, "%d\n", *((int *)s
->private));
2693 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
)
2695 return single_open(file
, sg_proc_seq_show_int
, &sg_allow_dio
);
2699 sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2700 size_t count
, loff_t
*off
)
2705 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2707 num
= (count
< 10) ? count
: 10;
2708 if (copy_from_user(buff
, buffer
, num
))
2711 sg_allow_dio
= simple_strtoul(buff
, NULL
, 10) ? 1 : 0;
2715 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
)
2717 return single_open(file
, sg_proc_seq_show_int
, &sg_big_buff
);
2721 sg_proc_write_dressz(struct file
*filp
, const char __user
*buffer
,
2722 size_t count
, loff_t
*off
)
2725 unsigned long k
= ULONG_MAX
;
2728 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2730 num
= (count
< 10) ? count
: 10;
2731 if (copy_from_user(buff
, buffer
, num
))
2734 k
= simple_strtoul(buff
, NULL
, 10);
2735 if (k
<= 1048576) { /* limit "big buff" to 1 MB */
2742 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
)
2744 seq_printf(s
, "%d\t%s [%s]\n", sg_version_num
, SG_VERSION_STR
,
2749 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
)
2751 return single_open(file
, sg_proc_seq_show_version
, NULL
);
2754 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
)
2756 seq_printf(s
, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2761 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
)
2763 return single_open(file
, sg_proc_seq_show_devhdr
, NULL
);
2766 struct sg_proc_deviter
{
2771 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
)
2773 struct sg_proc_deviter
* it
= kmalloc(sizeof(*it
), GFP_KERNEL
);
2780 it
->max
= sg_last_dev();
2781 if (it
->index
>= it
->max
)
2786 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
2788 struct sg_proc_deviter
* it
= s
->private;
2791 return (it
->index
< it
->max
) ? it
: NULL
;
2794 static void dev_seq_stop(struct seq_file
*s
, void *v
)
2799 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
)
2801 return seq_open(file
, &dev_seq_ops
);
2804 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
)
2806 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2808 struct scsi_device
*scsidp
;
2810 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2811 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
2812 seq_printf(s
, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2813 scsidp
->host
->host_no
, scsidp
->channel
,
2814 scsidp
->id
, scsidp
->lun
, (int) scsidp
->type
,
2816 (int) scsidp
->queue_depth
,
2817 (int) scsidp
->device_busy
,
2818 (int) scsi_device_online(scsidp
));
2820 seq_printf(s
, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2824 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
)
2826 return seq_open(file
, &devstrs_seq_ops
);
2829 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
)
2831 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2833 struct scsi_device
*scsidp
;
2835 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2836 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
2837 seq_printf(s
, "%8.8s\t%16.16s\t%4.4s\n",
2838 scsidp
->vendor
, scsidp
->model
, scsidp
->rev
);
2840 seq_printf(s
, "<no active device>\n");
2844 static void sg_proc_debug_helper(struct seq_file
*s
, Sg_device
* sdp
)
2846 int k
, m
, new_interface
, blen
, usg
;
2849 const sg_io_hdr_t
*hp
;
2853 for (k
= 0; (fp
= sg_get_nth_sfp(sdp
, k
)); ++k
) {
2854 seq_printf(s
, " FD(%d): timeout=%dms bufflen=%d "
2855 "(res)sgat=%d low_dma=%d\n", k
+ 1,
2856 jiffies_to_msecs(fp
->timeout
),
2857 fp
->reserve
.bufflen
,
2858 (int) fp
->reserve
.k_use_sg
,
2860 seq_printf(s
, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2861 (int) fp
->cmd_q
, (int) fp
->force_packid
,
2862 (int) fp
->keep_orphan
, (int) fp
->closed
);
2863 for (m
= 0; (srp
= sg_get_nth_request(fp
, m
)); ++m
) {
2865 new_interface
= (hp
->interface_id
== '\0') ? 0 : 1;
2866 if (srp
->res_used
) {
2867 if (new_interface
&&
2868 (SG_FLAG_MMAP_IO
& hp
->flags
))
2873 if (SG_INFO_DIRECT_IO_MASK
& hp
->info
)
2879 blen
= srp
->data
.bufflen
;
2880 usg
= srp
->data
.k_use_sg
;
2881 seq_printf(s
, srp
->done
?
2882 ((1 == srp
->done
) ? "rcv:" : "fin:")
2884 seq_printf(s
, " id=%d blen=%d",
2885 srp
->header
.pack_id
, blen
);
2887 seq_printf(s
, " dur=%d", hp
->duration
);
2889 ms
= jiffies_to_msecs(jiffies
);
2890 seq_printf(s
, " t_o/elap=%d/%d",
2891 (new_interface
? hp
->timeout
:
2892 jiffies_to_msecs(fp
->timeout
)),
2893 (ms
> hp
->duration
? ms
- hp
->duration
: 0));
2895 seq_printf(s
, "ms sgat=%d op=0x%02x\n", usg
,
2896 (int) srp
->data
.cmd_opcode
);
2899 seq_printf(s
, " No requests active\n");
2903 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
)
2905 return seq_open(file
, &debug_seq_ops
);
2908 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
)
2910 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2913 if (it
&& (0 == it
->index
)) {
2914 seq_printf(s
, "max_active_device=%d(origin 1)\n",
2916 seq_printf(s
, " def_reserved_size=%d\n", sg_big_buff
);
2918 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2920 struct scsi_device
*scsidp
= sdp
->device
;
2922 if (NULL
== scsidp
) {
2923 seq_printf(s
, "device %d detached ??\n",
2928 if (sg_get_nth_sfp(sdp
, 0)) {
2929 seq_printf(s
, " >>> device=%s ",
2930 sdp
->disk
->disk_name
);
2932 seq_printf(s
, "detached pending close ");
2935 (s
, "scsi%d chan=%d id=%d lun=%d em=%d",
2936 scsidp
->host
->host_no
,
2937 scsidp
->channel
, scsidp
->id
,
2939 scsidp
->host
->hostt
->emulated
);
2940 seq_printf(s
, " sg_tablesize=%d excl=%d\n",
2941 sdp
->sg_tablesize
, sdp
->exclude
);
2943 sg_proc_debug_helper(s
, sdp
);
2948 #endif /* CONFIG_SCSI_PROC_FS */
2950 module_init(init_sg
);
2951 module_exit(exit_sg
);