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)
220 static int sg_allow_access(struct file
*filp
, unsigned char *cmd
)
222 struct sg_fd
*sfp
= (struct sg_fd
*)filp
->private_data
;
223 struct request_queue
*q
= sfp
->parentdp
->device
->request_queue
;
225 if (sfp
->parentdp
->device
->type
== TYPE_SCANNER
)
228 return blk_verify_command(&q
->cmd_filter
,
229 cmd
, filp
->f_mode
& FMODE_WRITE
);
233 sg_open(struct inode
*inode
, struct file
*filp
)
235 int dev
= iminor(inode
);
236 int flags
= filp
->f_flags
;
237 struct request_queue
*q
;
244 nonseekable_open(inode
, filp
);
245 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev
, flags
));
246 sdp
= sg_get_dev(dev
);
247 if ((!sdp
) || (!sdp
->device
)) {
256 /* This driver's module count bumped by fops_get in <linux/fs.h> */
257 /* Prevent the device driver from vanishing while we sleep */
258 retval
= scsi_device_get(sdp
->device
);
264 if (!((flags
& O_NONBLOCK
) ||
265 scsi_block_when_processing_errors(sdp
->device
))) {
267 /* we are in error recovery for this device */
271 if (flags
& O_EXCL
) {
272 if (O_RDONLY
== (flags
& O_ACCMODE
)) {
273 retval
= -EPERM
; /* Can't lock it with read only access */
276 if (sdp
->headfp
&& (flags
& O_NONBLOCK
)) {
281 __wait_event_interruptible(sdp
->o_excl_wait
,
282 ((sdp
->headfp
|| sdp
->exclude
) ? 0 : (sdp
->exclude
= 1)), res
);
284 retval
= res
; /* -ERESTARTSYS because signal hit process */
287 } else if (sdp
->exclude
) { /* some other fd has an exclusive lock on dev */
288 if (flags
& O_NONBLOCK
) {
293 __wait_event_interruptible(sdp
->o_excl_wait
, (!sdp
->exclude
),
296 retval
= res
; /* -ERESTARTSYS because signal hit process */
304 if (!sdp
->headfp
) { /* no existing opens on this device */
306 q
= sdp
->device
->request_queue
;
307 sdp
->sg_tablesize
= min(q
->max_hw_segments
,
308 q
->max_phys_segments
);
310 if ((sfp
= sg_add_sfp(sdp
, dev
)))
311 filp
->private_data
= sfp
;
314 sdp
->exclude
= 0; /* undo if error */
322 scsi_device_put(sdp
->device
);
327 /* Following function was formerly called 'sg_close' */
329 sg_release(struct inode
*inode
, struct file
*filp
)
334 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
336 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp
->disk
->disk_name
));
337 sg_fasync(-1, filp
, 0); /* remove filp from async notification list */
338 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* Returns 1 when sdp gone */
339 if (!sdp
->detached
) {
340 scsi_device_put(sdp
->device
);
343 wake_up_interruptible(&sdp
->o_excl_wait
);
349 sg_read(struct file
*filp
, char __user
*buf
, size_t count
, loff_t
* ppos
)
354 int req_pack_id
= -1;
356 struct sg_header
*old_hdr
= NULL
;
359 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
361 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
362 sdp
->disk
->disk_name
, (int) count
));
364 if (!access_ok(VERIFY_WRITE
, buf
, count
))
366 if (sfp
->force_packid
&& (count
>= SZ_SG_HEADER
)) {
367 old_hdr
= kmalloc(SZ_SG_HEADER
, GFP_KERNEL
);
370 if (__copy_from_user(old_hdr
, buf
, SZ_SG_HEADER
)) {
374 if (old_hdr
->reply_len
< 0) {
375 if (count
>= SZ_SG_IO_HDR
) {
376 sg_io_hdr_t
*new_hdr
;
377 new_hdr
= kmalloc(SZ_SG_IO_HDR
, GFP_KERNEL
);
382 retval
=__copy_from_user
383 (new_hdr
, buf
, SZ_SG_IO_HDR
);
384 req_pack_id
= new_hdr
->pack_id
;
392 req_pack_id
= old_hdr
->pack_id
;
394 srp
= sg_get_rq_mark(sfp
, req_pack_id
);
395 if (!srp
) { /* now wait on packet to arrive */
400 if (filp
->f_flags
& O_NONBLOCK
) {
405 retval
= 0; /* following macro beats race condition */
406 __wait_event_interruptible(sfp
->read_wait
,
408 (srp
= sg_get_rq_mark(sfp
, req_pack_id
))),
417 /* -ERESTARTSYS as signal hit process */
421 if (srp
->header
.interface_id
!= '\0') {
422 retval
= sg_new_read(sfp
, buf
, count
, srp
);
427 if (old_hdr
== NULL
) {
428 old_hdr
= kmalloc(SZ_SG_HEADER
, GFP_KERNEL
);
434 memset(old_hdr
, 0, SZ_SG_HEADER
);
435 old_hdr
->reply_len
= (int) hp
->timeout
;
436 old_hdr
->pack_len
= old_hdr
->reply_len
; /* old, strange behaviour */
437 old_hdr
->pack_id
= hp
->pack_id
;
438 old_hdr
->twelve_byte
=
439 ((srp
->data
.cmd_opcode
>= 0xc0) && (12 == hp
->cmd_len
)) ? 1 : 0;
440 old_hdr
->target_status
= hp
->masked_status
;
441 old_hdr
->host_status
= hp
->host_status
;
442 old_hdr
->driver_status
= hp
->driver_status
;
443 if ((CHECK_CONDITION
& hp
->masked_status
) ||
444 (DRIVER_SENSE
& hp
->driver_status
))
445 memcpy(old_hdr
->sense_buffer
, srp
->sense_b
,
446 sizeof (old_hdr
->sense_buffer
));
447 switch (hp
->host_status
) {
448 /* This setup of 'result' is for backward compatibility and is best
449 ignored by the user who should use target, host + driver status */
451 case DID_PASSTHROUGH
:
458 old_hdr
->result
= EBUSY
;
465 old_hdr
->result
= EIO
;
468 old_hdr
->result
= (srp
->sense_b
[0] == 0 &&
469 hp
->masked_status
== GOOD
) ? 0 : EIO
;
472 old_hdr
->result
= EIO
;
476 /* Now copy the result back to the user buffer. */
477 if (count
>= SZ_SG_HEADER
) {
478 if (__copy_to_user(buf
, old_hdr
, SZ_SG_HEADER
)) {
483 if (count
> old_hdr
->reply_len
)
484 count
= old_hdr
->reply_len
;
485 if (count
> SZ_SG_HEADER
) {
486 if (sg_read_oxfer(srp
, buf
, count
- SZ_SG_HEADER
)) {
492 count
= (old_hdr
->result
== 0) ? 0 : -EIO
;
493 sg_finish_rem_req(srp
);
501 sg_new_read(Sg_fd
* sfp
, char __user
*buf
, size_t count
, Sg_request
* srp
)
503 sg_io_hdr_t
*hp
= &srp
->header
;
507 if (count
< SZ_SG_IO_HDR
) {
512 if ((hp
->mx_sb_len
> 0) && hp
->sbp
) {
513 if ((CHECK_CONDITION
& hp
->masked_status
) ||
514 (DRIVER_SENSE
& hp
->driver_status
)) {
515 int sb_len
= SCSI_SENSE_BUFFERSIZE
;
516 sb_len
= (hp
->mx_sb_len
> sb_len
) ? sb_len
: hp
->mx_sb_len
;
517 len
= 8 + (int) srp
->sense_b
[7]; /* Additional sense length field */
518 len
= (len
> sb_len
) ? sb_len
: len
;
519 if (copy_to_user(hp
->sbp
, srp
->sense_b
, len
)) {
526 if (hp
->masked_status
|| hp
->host_status
|| hp
->driver_status
)
527 hp
->info
|= SG_INFO_CHECK
;
528 if (copy_to_user(buf
, hp
, SZ_SG_IO_HDR
)) {
532 err
= sg_read_xfer(srp
);
534 sg_finish_rem_req(srp
);
535 return (0 == err
) ? count
: err
;
539 sg_write(struct file
*filp
, const char __user
*buf
, size_t count
, loff_t
* ppos
)
541 int mxsize
, cmd_size
, k
;
542 int input_size
, blocking
;
543 unsigned char opcode
;
547 struct sg_header old_hdr
;
549 unsigned char cmnd
[MAX_COMMAND_SIZE
];
551 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
553 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
554 sdp
->disk
->disk_name
, (int) count
));
557 if (!((filp
->f_flags
& O_NONBLOCK
) ||
558 scsi_block_when_processing_errors(sdp
->device
)))
561 if (!access_ok(VERIFY_READ
, buf
, count
))
562 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
563 if (count
< SZ_SG_HEADER
)
565 if (__copy_from_user(&old_hdr
, buf
, SZ_SG_HEADER
))
567 blocking
= !(filp
->f_flags
& O_NONBLOCK
);
568 if (old_hdr
.reply_len
< 0)
569 return sg_new_write(sfp
, filp
, buf
, count
, blocking
, 0, NULL
);
570 if (count
< (SZ_SG_HEADER
+ 6))
571 return -EIO
; /* The minimum scsi command length is 6 bytes. */
573 if (!(srp
= sg_add_request(sfp
))) {
574 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
578 __get_user(opcode
, buf
);
579 if (sfp
->next_cmd_len
> 0) {
580 if (sfp
->next_cmd_len
> MAX_COMMAND_SIZE
) {
581 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
582 sfp
->next_cmd_len
= 0;
583 sg_remove_request(sfp
, srp
);
586 cmd_size
= sfp
->next_cmd_len
;
587 sfp
->next_cmd_len
= 0; /* reset so only this write() effected */
589 cmd_size
= COMMAND_SIZE(opcode
); /* based on SCSI command group */
590 if ((opcode
>= 0xc0) && old_hdr
.twelve_byte
)
593 SCSI_LOG_TIMEOUT(4, printk(
594 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode
, cmd_size
));
595 /* Determine buffer size. */
596 input_size
= count
- cmd_size
;
597 mxsize
= (input_size
> old_hdr
.reply_len
) ? input_size
: old_hdr
.reply_len
;
598 mxsize
-= SZ_SG_HEADER
;
599 input_size
-= SZ_SG_HEADER
;
600 if (input_size
< 0) {
601 sg_remove_request(sfp
, srp
);
602 return -EIO
; /* User did not pass enough bytes for this command. */
605 hp
->interface_id
= '\0'; /* indicator of old interface tunnelled */
606 hp
->cmd_len
= (unsigned char) cmd_size
;
610 hp
->dxfer_direction
= (old_hdr
.reply_len
> SZ_SG_HEADER
) ?
611 SG_DXFER_TO_FROM_DEV
: SG_DXFER_TO_DEV
;
613 hp
->dxfer_direction
= (mxsize
> 0) ? SG_DXFER_FROM_DEV
: SG_DXFER_NONE
;
614 hp
->dxfer_len
= mxsize
;
615 hp
->dxferp
= (char __user
*)buf
+ cmd_size
;
617 hp
->timeout
= old_hdr
.reply_len
; /* structure abuse ... */
618 hp
->flags
= input_size
; /* structure abuse ... */
619 hp
->pack_id
= old_hdr
.pack_id
;
621 if (__copy_from_user(cmnd
, buf
, cmd_size
))
624 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
625 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
626 * is a non-zero input_size, so emit a warning.
628 if (hp
->dxfer_direction
== SG_DXFER_TO_FROM_DEV
) {
629 static char cmd
[TASK_COMM_LEN
];
630 if (strcmp(current
->comm
, cmd
) && printk_ratelimit()) {
632 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
633 "guessing data in;\n" KERN_WARNING
" "
634 "program %s not setting count and/or reply_len properly\n",
635 old_hdr
.reply_len
- (int)SZ_SG_HEADER
,
636 input_size
, (unsigned int) cmnd
[0],
638 strcpy(cmd
, current
->comm
);
641 k
= sg_common_write(sfp
, srp
, cmnd
, sfp
->timeout
, blocking
);
642 return (k
< 0) ? k
: count
;
646 sg_new_write(Sg_fd
*sfp
, struct file
*file
, const char __user
*buf
,
647 size_t count
, int blocking
, int read_only
,
653 unsigned char cmnd
[MAX_COMMAND_SIZE
];
655 unsigned long ul_timeout
;
657 if (count
< SZ_SG_IO_HDR
)
659 if (!access_ok(VERIFY_READ
, buf
, count
))
660 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
662 sfp
->cmd_q
= 1; /* when sg_io_hdr seen, set command queuing on */
663 if (!(srp
= sg_add_request(sfp
))) {
664 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
668 if (__copy_from_user(hp
, buf
, SZ_SG_IO_HDR
)) {
669 sg_remove_request(sfp
, srp
);
672 if (hp
->interface_id
!= 'S') {
673 sg_remove_request(sfp
, srp
);
676 if (hp
->flags
& SG_FLAG_MMAP_IO
) {
677 if (hp
->dxfer_len
> sfp
->reserve
.bufflen
) {
678 sg_remove_request(sfp
, srp
);
679 return -ENOMEM
; /* MMAP_IO size must fit in reserve buffer */
681 if (hp
->flags
& SG_FLAG_DIRECT_IO
) {
682 sg_remove_request(sfp
, srp
);
683 return -EINVAL
; /* either MMAP_IO or DIRECT_IO (not both) */
685 if (sg_res_in_use(sfp
)) {
686 sg_remove_request(sfp
, srp
);
687 return -EBUSY
; /* reserve buffer already being used */
690 ul_timeout
= msecs_to_jiffies(srp
->header
.timeout
);
691 timeout
= (ul_timeout
< INT_MAX
) ? ul_timeout
: INT_MAX
;
692 if ((!hp
->cmdp
) || (hp
->cmd_len
< 6) || (hp
->cmd_len
> sizeof (cmnd
))) {
693 sg_remove_request(sfp
, srp
);
696 if (!access_ok(VERIFY_READ
, hp
->cmdp
, hp
->cmd_len
)) {
697 sg_remove_request(sfp
, srp
);
698 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
700 if (__copy_from_user(cmnd
, hp
->cmdp
, hp
->cmd_len
)) {
701 sg_remove_request(sfp
, srp
);
704 if (read_only
&& sg_allow_access(file
, cmnd
)) {
705 sg_remove_request(sfp
, srp
);
708 k
= sg_common_write(sfp
, srp
, cmnd
, timeout
, blocking
);
717 sg_common_write(Sg_fd
* sfp
, Sg_request
* srp
,
718 unsigned char *cmnd
, int timeout
, int blocking
)
721 Sg_device
*sdp
= sfp
->parentdp
;
722 sg_io_hdr_t
*hp
= &srp
->header
;
724 srp
->data
.cmd_opcode
= cmnd
[0]; /* hold opcode of command */
726 hp
->masked_status
= 0;
730 hp
->driver_status
= 0;
732 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
733 (int) cmnd
[0], (int) hp
->cmd_len
));
735 if ((k
= sg_start_req(srp
))) {
736 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k
));
737 sg_finish_rem_req(srp
);
738 return k
; /* probably out of space --> ENOMEM */
740 if ((k
= sg_write_xfer(srp
))) {
741 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
742 sg_finish_rem_req(srp
);
746 sg_finish_rem_req(srp
);
750 switch (hp
->dxfer_direction
) {
751 case SG_DXFER_TO_FROM_DEV
:
752 case SG_DXFER_FROM_DEV
:
753 data_dir
= DMA_FROM_DEVICE
;
755 case SG_DXFER_TO_DEV
:
756 data_dir
= DMA_TO_DEVICE
;
758 case SG_DXFER_UNKNOWN
:
759 data_dir
= DMA_BIDIRECTIONAL
;
765 hp
->duration
= jiffies_to_msecs(jiffies
);
766 /* Now send everything of to mid-level. The next time we hear about this
767 packet is when sg_cmd_done() is called (i.e. a callback). */
768 if (scsi_execute_async(sdp
->device
, cmnd
, hp
->cmd_len
, data_dir
, srp
->data
.buffer
,
769 hp
->dxfer_len
, srp
->data
.k_use_sg
, timeout
,
770 SG_DEFAULT_RETRIES
, srp
, sg_cmd_done
,
772 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
774 * most likely out of mem, but could also be a bad map
776 sg_finish_rem_req(srp
);
783 sg_srp_done(Sg_request
*srp
, Sg_fd
*sfp
)
785 unsigned long iflags
;
788 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
790 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
795 sg_ioctl(struct inode
*inode
, struct file
*filp
,
796 unsigned int cmd_in
, unsigned long arg
)
798 void __user
*p
= (void __user
*)arg
;
800 int result
, val
, read_only
;
804 unsigned long iflags
;
806 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
809 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
810 sdp
->disk
->disk_name
, (int) cmd_in
));
811 read_only
= (O_RDWR
!= (filp
->f_flags
& O_ACCMODE
));
816 int blocking
= 1; /* ignore O_NONBLOCK flag */
820 if (!scsi_block_when_processing_errors(sdp
->device
))
822 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_IO_HDR
))
825 sg_new_write(sfp
, filp
, p
, SZ_SG_IO_HDR
,
826 blocking
, read_only
, &srp
);
829 srp
->sg_io_owned
= 1;
831 result
= 0; /* following macro to beat race condition */
832 __wait_event_interruptible(sfp
->read_wait
,
833 (sdp
->detached
|| sfp
->closed
|| sg_srp_done(srp
, sfp
)),
838 return 0; /* request packet dropped already */
842 return result
; /* -ERESTARTSYS because signal hit process */
844 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
846 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
847 result
= sg_new_read(sfp
, p
, SZ_SG_IO_HDR
, srp
);
848 return (result
< 0) ? result
: 0;
851 result
= get_user(val
, ip
);
856 if (val
>= MULDIV (INT_MAX
, USER_HZ
, HZ
))
857 val
= MULDIV (INT_MAX
, USER_HZ
, HZ
);
858 sfp
->timeout_user
= val
;
859 sfp
->timeout
= MULDIV (val
, HZ
, USER_HZ
);
862 case SG_GET_TIMEOUT
: /* N.B. User receives timeout as return value */
863 /* strange ..., for backward compatibility */
864 return sfp
->timeout_user
;
865 case SG_SET_FORCE_LOW_DMA
:
866 result
= get_user(val
, ip
);
871 if ((0 == sfp
->low_dma
) && (0 == sg_res_in_use(sfp
))) {
872 val
= (int) sfp
->reserve
.bufflen
;
873 sg_remove_scat(&sfp
->reserve
);
874 sg_build_reserve(sfp
, val
);
879 sfp
->low_dma
= sdp
->device
->host
->unchecked_isa_dma
;
883 return put_user((int) sfp
->low_dma
, ip
);
885 if (!access_ok(VERIFY_WRITE
, p
, sizeof (sg_scsi_id_t
)))
888 sg_scsi_id_t __user
*sg_idp
= p
;
892 __put_user((int) sdp
->device
->host
->host_no
,
894 __put_user((int) sdp
->device
->channel
,
896 __put_user((int) sdp
->device
->id
, &sg_idp
->scsi_id
);
897 __put_user((int) sdp
->device
->lun
, &sg_idp
->lun
);
898 __put_user((int) sdp
->device
->type
, &sg_idp
->scsi_type
);
899 __put_user((short) sdp
->device
->host
->cmd_per_lun
,
900 &sg_idp
->h_cmd_per_lun
);
901 __put_user((short) sdp
->device
->queue_depth
,
902 &sg_idp
->d_queue_depth
);
903 __put_user(0, &sg_idp
->unused
[0]);
904 __put_user(0, &sg_idp
->unused
[1]);
907 case SG_SET_FORCE_PACK_ID
:
908 result
= get_user(val
, ip
);
911 sfp
->force_packid
= val
? 1 : 0;
914 if (!access_ok(VERIFY_WRITE
, ip
, sizeof (int)))
916 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
917 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
918 if ((1 == srp
->done
) && (!srp
->sg_io_owned
)) {
919 read_unlock_irqrestore(&sfp
->rq_list_lock
,
921 __put_user(srp
->header
.pack_id
, ip
);
925 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
928 case SG_GET_NUM_WAITING
:
929 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
930 for (val
= 0, srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
931 if ((1 == srp
->done
) && (!srp
->sg_io_owned
))
934 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
935 return put_user(val
, ip
);
936 case SG_GET_SG_TABLESIZE
:
937 return put_user(sdp
->sg_tablesize
, ip
);
938 case SG_SET_RESERVED_SIZE
:
939 result
= get_user(val
, ip
);
944 val
= min_t(int, val
,
945 sdp
->device
->request_queue
->max_sectors
* 512);
946 if (val
!= sfp
->reserve
.bufflen
) {
947 if (sg_res_in_use(sfp
) || sfp
->mmap_called
)
949 sg_remove_scat(&sfp
->reserve
);
950 sg_build_reserve(sfp
, val
);
953 case SG_GET_RESERVED_SIZE
:
954 val
= min_t(int, sfp
->reserve
.bufflen
,
955 sdp
->device
->request_queue
->max_sectors
* 512);
956 return put_user(val
, ip
);
957 case SG_SET_COMMAND_Q
:
958 result
= get_user(val
, ip
);
961 sfp
->cmd_q
= val
? 1 : 0;
963 case SG_GET_COMMAND_Q
:
964 return put_user((int) sfp
->cmd_q
, ip
);
965 case SG_SET_KEEP_ORPHAN
:
966 result
= get_user(val
, ip
);
969 sfp
->keep_orphan
= val
;
971 case SG_GET_KEEP_ORPHAN
:
972 return put_user((int) sfp
->keep_orphan
, ip
);
973 case SG_NEXT_CMD_LEN
:
974 result
= get_user(val
, ip
);
977 sfp
->next_cmd_len
= (val
> 0) ? val
: 0;
979 case SG_GET_VERSION_NUM
:
980 return put_user(sg_version_num
, ip
);
981 case SG_GET_ACCESS_COUNT
:
982 /* faked - we don't have a real access count anymore */
983 val
= (sdp
->device
? 1 : 0);
984 return put_user(val
, ip
);
985 case SG_GET_REQUEST_TABLE
:
986 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_REQ_INFO
* SG_MAX_QUEUE
))
989 sg_req_info_t
*rinfo
;
992 rinfo
= kmalloc(SZ_SG_REQ_INFO
* SG_MAX_QUEUE
,
996 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
997 for (srp
= sfp
->headrp
, val
= 0; val
< SG_MAX_QUEUE
;
998 ++val
, srp
= srp
? srp
->nextrp
: srp
) {
999 memset(&rinfo
[val
], 0, SZ_SG_REQ_INFO
);
1001 rinfo
[val
].req_state
= srp
->done
+ 1;
1002 rinfo
[val
].problem
=
1003 srp
->header
.masked_status
&
1004 srp
->header
.host_status
&
1005 srp
->header
.driver_status
;
1007 rinfo
[val
].duration
=
1008 srp
->header
.duration
;
1010 ms
= jiffies_to_msecs(jiffies
);
1011 rinfo
[val
].duration
=
1012 (ms
> srp
->header
.duration
) ?
1013 (ms
- srp
->header
.duration
) : 0;
1015 rinfo
[val
].orphan
= srp
->orphan
;
1016 rinfo
[val
].sg_io_owned
=
1018 rinfo
[val
].pack_id
=
1019 srp
->header
.pack_id
;
1020 rinfo
[val
].usr_ptr
=
1021 srp
->header
.usr_ptr
;
1024 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1025 result
= __copy_to_user(p
, rinfo
,
1026 SZ_SG_REQ_INFO
* SG_MAX_QUEUE
);
1027 result
= result
? -EFAULT
: 0;
1031 case SG_EMULATED_HOST
:
1034 return put_user(sdp
->device
->host
->hostt
->emulated
, ip
);
1038 if (filp
->f_flags
& O_NONBLOCK
) {
1039 if (scsi_host_in_recovery(sdp
->device
->host
))
1041 } else if (!scsi_block_when_processing_errors(sdp
->device
))
1043 result
= get_user(val
, ip
);
1046 if (SG_SCSI_RESET_NOTHING
== val
)
1049 case SG_SCSI_RESET_DEVICE
:
1050 val
= SCSI_TRY_RESET_DEVICE
;
1052 case SG_SCSI_RESET_TARGET
:
1053 val
= SCSI_TRY_RESET_TARGET
;
1055 case SG_SCSI_RESET_BUS
:
1056 val
= SCSI_TRY_RESET_BUS
;
1058 case SG_SCSI_RESET_HOST
:
1059 val
= SCSI_TRY_RESET_HOST
;
1064 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
1066 return (scsi_reset_provider(sdp
->device
, val
) ==
1067 SUCCESS
) ? 0 : -EIO
;
1068 case SCSI_IOCTL_SEND_COMMAND
:
1072 unsigned char opcode
= WRITE_6
;
1073 Scsi_Ioctl_Command __user
*siocp
= p
;
1075 if (copy_from_user(&opcode
, siocp
->data
, 1))
1077 if (sg_allow_access(filp
, &opcode
))
1080 return sg_scsi_ioctl(filp
, sdp
->device
->request_queue
, NULL
, p
);
1082 result
= get_user(val
, ip
);
1085 sdp
->sgdebug
= (char) val
;
1087 case SCSI_IOCTL_GET_IDLUN
:
1088 case SCSI_IOCTL_GET_BUS_NUMBER
:
1089 case SCSI_IOCTL_PROBE_HOST
:
1090 case SG_GET_TRANSFORM
:
1093 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1095 return put_user(sdp
->device
->request_queue
->max_sectors
* 512,
1098 return blk_trace_setup(sdp
->device
->request_queue
,
1099 sdp
->disk
->disk_name
,
1100 sdp
->device
->sdev_gendev
.devt
,
1103 return blk_trace_startstop(sdp
->device
->request_queue
, 1);
1105 return blk_trace_startstop(sdp
->device
->request_queue
, 0);
1106 case BLKTRACETEARDOWN
:
1107 return blk_trace_remove(sdp
->device
->request_queue
);
1110 return -EPERM
; /* don't know so take safe approach */
1111 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1115 #ifdef CONFIG_COMPAT
1116 static long sg_compat_ioctl(struct file
*filp
, unsigned int cmd_in
, unsigned long arg
)
1120 struct scsi_device
*sdev
;
1122 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1126 if (sdev
->host
->hostt
->compat_ioctl
) {
1129 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd_in
, (void __user
*)arg
);
1134 return -ENOIOCTLCMD
;
1139 sg_poll(struct file
*filp
, poll_table
* wait
)
1141 unsigned int res
= 0;
1146 unsigned long iflags
;
1148 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
))
1151 poll_wait(filp
, &sfp
->read_wait
, wait
);
1152 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1153 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
1154 /* if any read waiting, flag it */
1155 if ((0 == res
) && (1 == srp
->done
) && (!srp
->sg_io_owned
))
1156 res
= POLLIN
| POLLRDNORM
;
1159 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1163 else if (!sfp
->cmd_q
) {
1165 res
|= POLLOUT
| POLLWRNORM
;
1166 } else if (count
< SG_MAX_QUEUE
)
1167 res
|= POLLOUT
| POLLWRNORM
;
1168 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1169 sdp
->disk
->disk_name
, (int) res
));
1174 sg_fasync(int fd
, struct file
*filp
, int mode
)
1180 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1182 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1183 sdp
->disk
->disk_name
, mode
));
1185 retval
= fasync_helper(fd
, filp
, mode
, &sfp
->async_qp
);
1186 return (retval
< 0) ? retval
: 0;
1190 sg_vma_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1193 unsigned long offset
, len
, sa
;
1194 Sg_scatter_hold
*rsv_schp
;
1195 struct scatterlist
*sg
;
1198 if ((NULL
== vma
) || (!(sfp
= (Sg_fd
*) vma
->vm_private_data
)))
1199 return VM_FAULT_SIGBUS
;
1200 rsv_schp
= &sfp
->reserve
;
1201 offset
= vmf
->pgoff
<< PAGE_SHIFT
;
1202 if (offset
>= rsv_schp
->bufflen
)
1203 return VM_FAULT_SIGBUS
;
1204 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1205 offset
, rsv_schp
->k_use_sg
));
1206 sg
= rsv_schp
->buffer
;
1208 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1209 ++k
, sg
= sg_next(sg
)) {
1210 len
= vma
->vm_end
- sa
;
1211 len
= (len
< sg
->length
) ? len
: sg
->length
;
1214 page
= virt_to_page(page_address(sg_page(sg
)) + offset
);
1215 get_page(page
); /* increment page count */
1217 return 0; /* success */
1223 return VM_FAULT_SIGBUS
;
1226 static struct vm_operations_struct sg_mmap_vm_ops
= {
1227 .fault
= sg_vma_fault
,
1231 sg_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
1234 unsigned long req_sz
, len
, sa
;
1235 Sg_scatter_hold
*rsv_schp
;
1237 struct scatterlist
*sg
;
1239 if ((!filp
) || (!vma
) || (!(sfp
= (Sg_fd
*) filp
->private_data
)))
1241 req_sz
= vma
->vm_end
- vma
->vm_start
;
1242 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1243 (void *) vma
->vm_start
, (int) req_sz
));
1245 return -EINVAL
; /* want no offset */
1246 rsv_schp
= &sfp
->reserve
;
1247 if (req_sz
> rsv_schp
->bufflen
)
1248 return -ENOMEM
; /* cannot map more than reserved buffer */
1251 sg
= rsv_schp
->buffer
;
1252 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1253 ++k
, sg
= sg_next(sg
)) {
1254 len
= vma
->vm_end
- sa
;
1255 len
= (len
< sg
->length
) ? len
: sg
->length
;
1259 sfp
->mmap_called
= 1;
1260 vma
->vm_flags
|= VM_RESERVED
;
1261 vma
->vm_private_data
= sfp
;
1262 vma
->vm_ops
= &sg_mmap_vm_ops
;
1266 /* This function is a "bottom half" handler that is called by the
1267 * mid level when a command is completed (or has failed). */
1269 sg_cmd_done(void *data
, char *sense
, int result
, int resid
)
1271 Sg_request
*srp
= data
;
1272 Sg_device
*sdp
= NULL
;
1274 unsigned long iflags
;
1278 printk(KERN_ERR
"sg_cmd_done: NULL request\n");
1281 sfp
= srp
->parentfp
;
1283 sdp
= sfp
->parentdp
;
1284 if ((NULL
== sdp
) || sdp
->detached
) {
1285 printk(KERN_INFO
"sg_cmd_done: device detached\n");
1290 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1291 sdp
->disk
->disk_name
, srp
->header
.pack_id
, result
));
1292 srp
->header
.resid
= resid
;
1293 ms
= jiffies_to_msecs(jiffies
);
1294 srp
->header
.duration
= (ms
> srp
->header
.duration
) ?
1295 (ms
- srp
->header
.duration
) : 0;
1297 struct scsi_sense_hdr sshdr
;
1299 memcpy(srp
->sense_b
, sense
, sizeof (srp
->sense_b
));
1300 srp
->header
.status
= 0xff & result
;
1301 srp
->header
.masked_status
= status_byte(result
);
1302 srp
->header
.msg_status
= msg_byte(result
);
1303 srp
->header
.host_status
= host_byte(result
);
1304 srp
->header
.driver_status
= driver_byte(result
);
1305 if ((sdp
->sgdebug
> 0) &&
1306 ((CHECK_CONDITION
== srp
->header
.masked_status
) ||
1307 (COMMAND_TERMINATED
== srp
->header
.masked_status
)))
1308 __scsi_print_sense("sg_cmd_done", sense
,
1309 SCSI_SENSE_BUFFERSIZE
);
1311 /* Following if statement is a patch supplied by Eric Youngdale */
1312 if (driver_byte(result
) != 0
1313 && scsi_normalize_sense(sense
, SCSI_SENSE_BUFFERSIZE
, &sshdr
)
1314 && !scsi_sense_is_deferred(&sshdr
)
1315 && sshdr
.sense_key
== UNIT_ATTENTION
1316 && sdp
->device
->removable
) {
1317 /* Detected possible disc change. Set the bit - this */
1318 /* may be used if there are filesystems using this device */
1319 sdp
->device
->changed
= 1;
1322 /* Rely on write phase to clean out srp status values, so no "else" */
1324 if (sfp
->closed
) { /* whoops this fd already released, cleanup */
1325 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1326 sg_finish_rem_req(srp
);
1328 if (NULL
== sfp
->headrp
) {
1329 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1330 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* device still present */
1331 scsi_device_put(sdp
->device
);
1335 } else if (srp
&& srp
->orphan
) {
1336 if (sfp
->keep_orphan
)
1337 srp
->sg_io_owned
= 0;
1339 sg_finish_rem_req(srp
);
1344 /* Now wake up any sg_read() that is waiting for this packet. */
1345 kill_fasync(&sfp
->async_qp
, SIGPOLL
, POLL_IN
);
1346 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1348 wake_up_interruptible(&sfp
->read_wait
);
1349 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1353 static struct file_operations sg_fops
= {
1354 .owner
= THIS_MODULE
,
1359 #ifdef CONFIG_COMPAT
1360 .compat_ioctl
= sg_compat_ioctl
,
1364 .release
= sg_release
,
1365 .fasync
= sg_fasync
,
1368 static struct class *sg_sysfs_class
;
1370 static int sg_sysfs_valid
= 0;
1372 static Sg_device
*sg_alloc(struct gendisk
*disk
, struct scsi_device
*scsidp
)
1374 struct request_queue
*q
= scsidp
->request_queue
;
1376 unsigned long iflags
;
1380 sdp
= kzalloc(sizeof(Sg_device
), GFP_KERNEL
);
1382 printk(KERN_WARNING
"kmalloc Sg_device failure\n");
1383 return ERR_PTR(-ENOMEM
);
1386 if (!idr_pre_get(&sg_index_idr
, GFP_KERNEL
)) {
1387 printk(KERN_WARNING
"idr expansion Sg_device failure\n");
1391 write_lock_irqsave(&sg_index_lock
, iflags
);
1392 error
= idr_get_new(&sg_index_idr
, sdp
, &k
);
1393 write_unlock_irqrestore(&sg_index_lock
, iflags
);
1396 printk(KERN_WARNING
"idr allocation Sg_device failure: %d\n",
1401 if (unlikely(k
>= SG_MAX_DEVS
))
1404 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k
));
1405 sprintf(disk
->disk_name
, "sg%d", k
);
1406 disk
->first_minor
= k
;
1408 sdp
->device
= scsidp
;
1409 init_waitqueue_head(&sdp
->o_excl_wait
);
1410 sdp
->sg_tablesize
= min(q
->max_hw_segments
, q
->max_phys_segments
);
1417 return ERR_PTR(error
);
1422 sdev_printk(KERN_WARNING
, scsidp
,
1423 "Unable to attach sg device type=%d, minor "
1424 "number exceeds %d\n", scsidp
->type
, SG_MAX_DEVS
- 1);
1430 sg_add(struct device
*cl_dev
, struct class_interface
*cl_intf
)
1432 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->parent
);
1433 struct gendisk
*disk
;
1434 Sg_device
*sdp
= NULL
;
1435 struct cdev
* cdev
= NULL
;
1437 unsigned long iflags
;
1439 disk
= alloc_disk(1);
1441 printk(KERN_WARNING
"alloc_disk failed\n");
1444 disk
->major
= SCSI_GENERIC_MAJOR
;
1447 cdev
= cdev_alloc();
1449 printk(KERN_WARNING
"cdev_alloc failed\n");
1452 cdev
->owner
= THIS_MODULE
;
1453 cdev
->ops
= &sg_fops
;
1455 sdp
= sg_alloc(disk
, scsidp
);
1457 printk(KERN_WARNING
"sg_alloc failed\n");
1458 error
= PTR_ERR(sdp
);
1462 error
= cdev_add(cdev
, MKDEV(SCSI_GENERIC_MAJOR
, sdp
->index
), 1);
1467 if (sg_sysfs_valid
) {
1468 struct device
*sg_class_member
;
1470 sg_class_member
= device_create_drvdata(sg_sysfs_class
,
1472 MKDEV(SCSI_GENERIC_MAJOR
,
1475 "%s", disk
->disk_name
);
1476 if (IS_ERR(sg_class_member
)) {
1477 printk(KERN_ERR
"sg_add: "
1478 "device_create failed\n");
1479 error
= PTR_ERR(sg_class_member
);
1482 error
= sysfs_create_link(&scsidp
->sdev_gendev
.kobj
,
1483 &sg_class_member
->kobj
, "generic");
1485 printk(KERN_ERR
"sg_add: unable to make symlink "
1486 "'generic' back to sg%d\n", sdp
->index
);
1488 printk(KERN_WARNING
"sg_add: sg_sys Invalid\n");
1490 sdev_printk(KERN_NOTICE
, scsidp
,
1491 "Attached scsi generic sg%d type %d\n", sdp
->index
,
1494 dev_set_drvdata(cl_dev
, sdp
);
1499 write_lock_irqsave(&sg_index_lock
, iflags
);
1500 idr_remove(&sg_index_idr
, sdp
->index
);
1501 write_unlock_irqrestore(&sg_index_lock
, iflags
);
1512 sg_remove(struct device
*cl_dev
, struct class_interface
*cl_intf
)
1514 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->parent
);
1515 Sg_device
*sdp
= dev_get_drvdata(cl_dev
);
1516 unsigned long iflags
;
1527 write_lock_irqsave(&sg_index_lock
, iflags
);
1530 for (sfp
= sdp
->headfp
; sfp
; sfp
= tsfp
) {
1532 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
1534 if (sfp
->closed
|| (0 == sg_srp_done(srp
, sfp
)))
1535 sg_finish_rem_req(srp
);
1538 scsi_device_put(sdp
->device
);
1539 __sg_remove_sfp(sdp
, sfp
);
1542 wake_up_interruptible(&sfp
->read_wait
);
1543 kill_fasync(&sfp
->async_qp
, SIGPOLL
,
1547 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp
->index
));
1548 if (NULL
== sdp
->headfp
) {
1549 idr_remove(&sg_index_idr
, sdp
->index
);
1551 } else { /* nothing active, simple case */
1552 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp
->index
));
1553 idr_remove(&sg_index_idr
, sdp
->index
);
1555 write_unlock_irqrestore(&sg_index_lock
, iflags
);
1557 sysfs_remove_link(&scsidp
->sdev_gendev
.kobj
, "generic");
1558 device_destroy(sg_sysfs_class
, MKDEV(SCSI_GENERIC_MAJOR
, sdp
->index
));
1559 cdev_del(sdp
->cdev
);
1561 put_disk(sdp
->disk
);
1563 if (NULL
== sdp
->headfp
)
1567 msleep(10); /* dirty detach so delay device destruction */
1570 module_param_named(scatter_elem_sz
, scatter_elem_sz
, int, S_IRUGO
| S_IWUSR
);
1571 module_param_named(def_reserved_size
, def_reserved_size
, int,
1573 module_param_named(allow_dio
, sg_allow_dio
, int, S_IRUGO
| S_IWUSR
);
1575 MODULE_AUTHOR("Douglas Gilbert");
1576 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1577 MODULE_LICENSE("GPL");
1578 MODULE_VERSION(SG_VERSION_STR
);
1579 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR
);
1581 MODULE_PARM_DESC(scatter_elem_sz
, "scatter gather element "
1582 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1583 MODULE_PARM_DESC(def_reserved_size
, "size of buffer reserved for each fd");
1584 MODULE_PARM_DESC(allow_dio
, "allow direct I/O (default: 0 (disallow))");
1591 if (scatter_elem_sz
< PAGE_SIZE
) {
1592 scatter_elem_sz
= PAGE_SIZE
;
1593 scatter_elem_sz_prev
= scatter_elem_sz
;
1595 if (def_reserved_size
>= 0)
1596 sg_big_buff
= def_reserved_size
;
1598 def_reserved_size
= sg_big_buff
;
1600 rc
= register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1604 sg_sysfs_class
= class_create(THIS_MODULE
, "scsi_generic");
1605 if ( IS_ERR(sg_sysfs_class
) ) {
1606 rc
= PTR_ERR(sg_sysfs_class
);
1610 rc
= scsi_register_interface(&sg_interface
);
1612 #ifdef CONFIG_SCSI_PROC_FS
1614 #endif /* CONFIG_SCSI_PROC_FS */
1617 class_destroy(sg_sysfs_class
);
1619 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0), SG_MAX_DEVS
);
1626 #ifdef CONFIG_SCSI_PROC_FS
1628 #endif /* CONFIG_SCSI_PROC_FS */
1629 scsi_unregister_interface(&sg_interface
);
1630 class_destroy(sg_sysfs_class
);
1632 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1634 idr_destroy(&sg_index_idr
);
1638 sg_start_req(Sg_request
* srp
)
1641 Sg_fd
*sfp
= srp
->parentfp
;
1642 sg_io_hdr_t
*hp
= &srp
->header
;
1643 int dxfer_len
= (int) hp
->dxfer_len
;
1644 int dxfer_dir
= hp
->dxfer_direction
;
1645 Sg_scatter_hold
*req_schp
= &srp
->data
;
1646 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
1648 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len
));
1649 if ((dxfer_len
<= 0) || (dxfer_dir
== SG_DXFER_NONE
))
1651 if (sg_allow_dio
&& (hp
->flags
& SG_FLAG_DIRECT_IO
) &&
1652 (dxfer_dir
!= SG_DXFER_UNKNOWN
) && (0 == hp
->iovec_count
) &&
1653 (!sfp
->parentdp
->device
->host
->unchecked_isa_dma
)) {
1654 res
= sg_build_direct(srp
, sfp
, dxfer_len
);
1655 if (res
<= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1658 if ((!sg_res_in_use(sfp
)) && (dxfer_len
<= rsv_schp
->bufflen
))
1659 sg_link_reserve(sfp
, srp
, dxfer_len
);
1661 res
= sg_build_indirect(req_schp
, sfp
, dxfer_len
);
1663 sg_remove_scat(req_schp
);
1671 sg_finish_rem_req(Sg_request
* srp
)
1673 Sg_fd
*sfp
= srp
->parentfp
;
1674 Sg_scatter_hold
*req_schp
= &srp
->data
;
1676 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp
->res_used
));
1678 sg_unlink_reserve(sfp
, srp
);
1680 sg_remove_scat(req_schp
);
1681 sg_remove_request(sfp
, srp
);
1685 sg_build_sgat(Sg_scatter_hold
* schp
, const Sg_fd
* sfp
, int tablesize
)
1687 int sg_bufflen
= tablesize
* sizeof(struct scatterlist
);
1688 gfp_t gfp_flags
= GFP_ATOMIC
| __GFP_NOWARN
;
1691 * TODO: test without low_dma, we should not need it since
1692 * the block layer will bounce the buffer for us
1694 * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
1697 gfp_flags
|= GFP_DMA
;
1698 schp
->buffer
= kzalloc(sg_bufflen
, gfp_flags
);
1701 sg_init_table(schp
->buffer
, tablesize
);
1702 schp
->sglist_len
= sg_bufflen
;
1703 return tablesize
; /* number of scat_gath elements allocated */
1706 #ifdef SG_ALLOW_DIO_CODE
1707 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1708 /* TODO: hopefully we can use the generic block layer code */
1710 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1711 - mapping of all pages not successful
1712 (i.e., either completely successful or fails)
1715 st_map_user_pages(struct scatterlist
*sgl
, const unsigned int max_pages
,
1716 unsigned long uaddr
, size_t count
, int rw
)
1718 unsigned long end
= (uaddr
+ count
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
1719 unsigned long start
= uaddr
>> PAGE_SHIFT
;
1720 const int nr_pages
= end
- start
;
1722 struct page
**pages
;
1724 /* User attempted Overflow! */
1725 if ((uaddr
+ count
) < uaddr
)
1729 if (nr_pages
> max_pages
)
1736 if ((pages
= kmalloc(max_pages
* sizeof(*pages
), GFP_ATOMIC
)) == NULL
)
1739 /* Try to fault in all of the necessary pages */
1740 down_read(¤t
->mm
->mmap_sem
);
1741 /* rw==READ means read from drive, write into memory area */
1742 res
= get_user_pages(
1748 0, /* don't force */
1751 up_read(¤t
->mm
->mmap_sem
);
1753 /* Errors and no page mapped should return here */
1757 for (i
=0; i
< nr_pages
; i
++) {
1758 /* FIXME: flush superflous for rw==READ,
1759 * probably wrong function for rw==WRITE
1761 flush_dcache_page(pages
[i
]);
1762 /* ?? Is locking needed? I don't think so */
1763 /* if (!trylock_page(pages[i]))
1767 sg_set_page(sgl
, pages
[0], 0, uaddr
& ~PAGE_MASK
);
1769 sgl
[0].length
= PAGE_SIZE
- sgl
[0].offset
;
1770 count
-= sgl
[0].length
;
1771 for (i
=1; i
< nr_pages
; i
++)
1772 sg_set_page(&sgl
[i
], pages
[i
], count
< PAGE_SIZE
? count
: PAGE_SIZE
, 0);
1775 sgl
[0].length
= count
;
1783 for (j
=0; j
< res
; j
++)
1784 page_cache_release(pages
[j
]);
1792 /* And unmap them... */
1794 st_unmap_user_pages(struct scatterlist
*sgl
, const unsigned int nr_pages
,
1799 for (i
=0; i
< nr_pages
; i
++) {
1800 struct page
*page
= sg_page(&sgl
[i
]);
1804 /* unlock_page(page); */
1805 /* FIXME: cache flush missing for rw==READ
1806 * FIXME: call the correct reference counting function
1808 page_cache_release(page
);
1814 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1818 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1820 sg_build_direct(Sg_request
* srp
, Sg_fd
* sfp
, int dxfer_len
)
1822 #ifdef SG_ALLOW_DIO_CODE
1823 sg_io_hdr_t
*hp
= &srp
->header
;
1824 Sg_scatter_hold
*schp
= &srp
->data
;
1825 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1826 int mx_sc_elems
, res
;
1827 struct scsi_device
*sdev
= sfp
->parentdp
->device
;
1829 if (((unsigned long)hp
->dxferp
&
1830 queue_dma_alignment(sdev
->request_queue
)) != 0)
1833 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1834 if (mx_sc_elems
<= 0) {
1837 res
= st_map_user_pages(schp
->buffer
, mx_sc_elems
,
1838 (unsigned long)hp
->dxferp
, dxfer_len
,
1839 (SG_DXFER_TO_DEV
== hp
->dxfer_direction
) ? 1 : 0);
1841 sg_remove_scat(schp
);
1844 schp
->k_use_sg
= res
;
1845 schp
->dio_in_use
= 1;
1846 hp
->info
|= SG_INFO_DIRECT_IO
;
1854 sg_build_indirect(Sg_scatter_hold
* schp
, Sg_fd
* sfp
, int buff_size
)
1856 struct scatterlist
*sg
;
1857 int ret_sz
= 0, k
, rem_sz
, num
, mx_sc_elems
;
1858 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1859 int blk_size
= buff_size
;
1860 struct page
*p
= NULL
;
1865 ++blk_size
; /* don't know why */
1866 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1867 blk_size
= (blk_size
+ SG_SECTOR_MSK
) & (~SG_SECTOR_MSK
);
1868 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1869 buff_size
, blk_size
));
1871 /* N.B. ret_sz carried into this block ... */
1872 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1873 if (mx_sc_elems
< 0)
1874 return mx_sc_elems
; /* most likely -ENOMEM */
1876 num
= scatter_elem_sz
;
1877 if (unlikely(num
!= scatter_elem_sz_prev
)) {
1878 if (num
< PAGE_SIZE
) {
1879 scatter_elem_sz
= PAGE_SIZE
;
1880 scatter_elem_sz_prev
= PAGE_SIZE
;
1882 scatter_elem_sz_prev
= num
;
1884 for (k
= 0, sg
= schp
->buffer
, rem_sz
= blk_size
;
1885 (rem_sz
> 0) && (k
< mx_sc_elems
);
1886 ++k
, rem_sz
-= ret_sz
, sg
= sg_next(sg
)) {
1888 num
= (rem_sz
> scatter_elem_sz_prev
) ?
1889 scatter_elem_sz_prev
: rem_sz
;
1890 p
= sg_page_malloc(num
, sfp
->low_dma
, &ret_sz
);
1894 if (num
== scatter_elem_sz_prev
) {
1895 if (unlikely(ret_sz
> scatter_elem_sz_prev
)) {
1896 scatter_elem_sz
= ret_sz
;
1897 scatter_elem_sz_prev
= ret_sz
;
1900 sg_set_page(sg
, p
, (ret_sz
> num
) ? num
: ret_sz
, 0);
1902 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1903 "ret_sz=%d\n", k
, num
, ret_sz
));
1904 } /* end of for loop */
1907 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1908 "rem_sz=%d\n", k
, rem_sz
));
1910 schp
->bufflen
= blk_size
;
1911 if (rem_sz
> 0) /* must have failed */
1918 sg_write_xfer(Sg_request
* srp
)
1920 sg_io_hdr_t
*hp
= &srp
->header
;
1921 Sg_scatter_hold
*schp
= &srp
->data
;
1922 struct scatterlist
*sg
= schp
->buffer
;
1924 int j
, k
, onum
, usglen
, ksglen
, res
;
1925 int iovec_count
= (int) hp
->iovec_count
;
1926 int dxfer_dir
= hp
->dxfer_direction
;
1928 unsigned char __user
*up
;
1929 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
1931 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_TO_DEV
== dxfer_dir
) ||
1932 (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
1933 num_xfer
= (int) (new_interface
? hp
->dxfer_len
: hp
->flags
);
1934 if (schp
->bufflen
< num_xfer
)
1935 num_xfer
= schp
->bufflen
;
1937 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
1939 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
1942 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1943 num_xfer
, iovec_count
, schp
->k_use_sg
));
1946 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
1951 ksglen
= sg
->length
;
1952 p
= page_address(sg_page(sg
));
1953 for (j
= 0, k
= 0; j
< onum
; ++j
) {
1954 res
= sg_u_iovec(hp
, iovec_count
, j
, 1, &usglen
, &up
);
1958 for (; p
; sg
= sg_next(sg
), ksglen
= sg
->length
,
1959 p
= page_address(sg_page(sg
))) {
1962 if (ksglen
> usglen
) {
1963 if (usglen
>= num_xfer
) {
1964 if (__copy_from_user(p
, up
, num_xfer
))
1968 if (__copy_from_user(p
, up
, usglen
))
1974 if (ksglen
>= num_xfer
) {
1975 if (__copy_from_user(p
, up
, num_xfer
))
1979 if (__copy_from_user(p
, up
, ksglen
))
1985 if (k
>= schp
->k_use_sg
)
1994 sg_u_iovec(sg_io_hdr_t
* hp
, int sg_num
, int ind
,
1995 int wr_xf
, int *countp
, unsigned char __user
**up
)
1997 int num_xfer
= (int) hp
->dxfer_len
;
1998 unsigned char __user
*p
= hp
->dxferp
;
2002 if (wr_xf
&& ('\0' == hp
->interface_id
))
2003 count
= (int) hp
->flags
; /* holds "old" input_size */
2008 if (__copy_from_user(&iovec
, p
+ ind
*SZ_SG_IOVEC
, SZ_SG_IOVEC
))
2011 count
= (int) iovec
.iov_len
;
2013 if (!access_ok(wr_xf
? VERIFY_READ
: VERIFY_WRITE
, p
, count
))
2023 sg_remove_scat(Sg_scatter_hold
* schp
)
2025 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp
->k_use_sg
));
2026 if (schp
->buffer
&& (schp
->sglist_len
> 0)) {
2027 struct scatterlist
*sg
= schp
->buffer
;
2029 if (schp
->dio_in_use
) {
2030 #ifdef SG_ALLOW_DIO_CODE
2031 st_unmap_user_pages(sg
, schp
->k_use_sg
, TRUE
);
2036 for (k
= 0; (k
< schp
->k_use_sg
) && sg_page(sg
);
2037 ++k
, sg
= sg_next(sg
)) {
2038 SCSI_LOG_TIMEOUT(5, printk(
2039 "sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
2040 k
, sg_page(sg
), sg
->length
));
2041 sg_page_free(sg_page(sg
), sg
->length
);
2044 kfree(schp
->buffer
);
2046 memset(schp
, 0, sizeof (*schp
));
2050 sg_read_xfer(Sg_request
* srp
)
2052 sg_io_hdr_t
*hp
= &srp
->header
;
2053 Sg_scatter_hold
*schp
= &srp
->data
;
2054 struct scatterlist
*sg
= schp
->buffer
;
2056 int j
, k
, onum
, usglen
, ksglen
, res
;
2057 int iovec_count
= (int) hp
->iovec_count
;
2058 int dxfer_dir
= hp
->dxfer_direction
;
2060 unsigned char __user
*up
;
2061 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
2063 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_FROM_DEV
== dxfer_dir
)
2064 || (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
2065 num_xfer
= hp
->dxfer_len
;
2066 if (schp
->bufflen
< num_xfer
)
2067 num_xfer
= schp
->bufflen
;
2069 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
2071 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
2074 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2075 num_xfer
, iovec_count
, schp
->k_use_sg
));
2078 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
2083 p
= page_address(sg_page(sg
));
2084 ksglen
= sg
->length
;
2085 for (j
= 0, k
= 0; j
< onum
; ++j
) {
2086 res
= sg_u_iovec(hp
, iovec_count
, j
, 0, &usglen
, &up
);
2090 for (; p
; sg
= sg_next(sg
), ksglen
= sg
->length
,
2091 p
= page_address(sg_page(sg
))) {
2094 if (ksglen
> usglen
) {
2095 if (usglen
>= num_xfer
) {
2096 if (__copy_to_user(up
, p
, num_xfer
))
2100 if (__copy_to_user(up
, p
, usglen
))
2106 if (ksglen
>= num_xfer
) {
2107 if (__copy_to_user(up
, p
, num_xfer
))
2111 if (__copy_to_user(up
, p
, ksglen
))
2117 if (k
>= schp
->k_use_sg
)
2126 sg_read_oxfer(Sg_request
* srp
, char __user
*outp
, int num_read_xfer
)
2128 Sg_scatter_hold
*schp
= &srp
->data
;
2129 struct scatterlist
*sg
= schp
->buffer
;
2132 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2134 if ((!outp
) || (num_read_xfer
<= 0))
2137 for (k
= 0; (k
< schp
->k_use_sg
) && sg_page(sg
); ++k
, sg
= sg_next(sg
)) {
2139 if (num
> num_read_xfer
) {
2140 if (__copy_to_user(outp
, page_address(sg_page(sg
)),
2145 if (__copy_to_user(outp
, page_address(sg_page(sg
)),
2148 num_read_xfer
-= num
;
2149 if (num_read_xfer
<= 0)
2159 sg_build_reserve(Sg_fd
* sfp
, int req_size
)
2161 Sg_scatter_hold
*schp
= &sfp
->reserve
;
2163 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size
));
2165 if (req_size
< PAGE_SIZE
)
2166 req_size
= PAGE_SIZE
;
2167 if (0 == sg_build_indirect(schp
, sfp
, req_size
))
2170 sg_remove_scat(schp
);
2171 req_size
>>= 1; /* divide by 2 */
2172 } while (req_size
> (PAGE_SIZE
/ 2));
2176 sg_link_reserve(Sg_fd
* sfp
, Sg_request
* srp
, int size
)
2178 Sg_scatter_hold
*req_schp
= &srp
->data
;
2179 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2180 struct scatterlist
*sg
= rsv_schp
->buffer
;
2184 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size
));
2187 for (k
= 0; k
< rsv_schp
->k_use_sg
; ++k
, sg
= sg_next(sg
)) {
2190 sfp
->save_scat_len
= num
;
2192 req_schp
->k_use_sg
= k
+ 1;
2193 req_schp
->sglist_len
= rsv_schp
->sglist_len
;
2194 req_schp
->buffer
= rsv_schp
->buffer
;
2196 req_schp
->bufflen
= size
;
2197 req_schp
->b_malloc_len
= rsv_schp
->b_malloc_len
;
2203 if (k
>= rsv_schp
->k_use_sg
)
2204 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2208 sg_unlink_reserve(Sg_fd
* sfp
, Sg_request
* srp
)
2210 Sg_scatter_hold
*req_schp
= &srp
->data
;
2211 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2213 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2214 (int) req_schp
->k_use_sg
));
2215 if ((rsv_schp
->k_use_sg
> 0) && (req_schp
->k_use_sg
> 0)) {
2216 struct scatterlist
*sg
= rsv_schp
->buffer
;
2218 if (sfp
->save_scat_len
> 0)
2219 (sg
+ (req_schp
->k_use_sg
- 1))->length
=
2220 (unsigned) sfp
->save_scat_len
;
2222 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2224 req_schp
->k_use_sg
= 0;
2225 req_schp
->bufflen
= 0;
2226 req_schp
->buffer
= NULL
;
2227 req_schp
->sglist_len
= 0;
2228 sfp
->save_scat_len
= 0;
2233 sg_get_rq_mark(Sg_fd
* sfp
, int pack_id
)
2236 unsigned long iflags
;
2238 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2239 for (resp
= sfp
->headrp
; resp
; resp
= resp
->nextrp
) {
2240 /* look for requests that are ready + not SG_IO owned */
2241 if ((1 == resp
->done
) && (!resp
->sg_io_owned
) &&
2242 ((-1 == pack_id
) || (resp
->header
.pack_id
== pack_id
))) {
2243 resp
->done
= 2; /* guard against other readers */
2247 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2251 #ifdef CONFIG_SCSI_PROC_FS
2253 sg_get_nth_request(Sg_fd
* sfp
, int nth
)
2256 unsigned long iflags
;
2259 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2260 for (k
= 0, resp
= sfp
->headrp
; resp
&& (k
< nth
);
2261 ++k
, resp
= resp
->nextrp
) ;
2262 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2267 /* always adds to end of list */
2269 sg_add_request(Sg_fd
* sfp
)
2272 unsigned long iflags
;
2274 Sg_request
*rp
= sfp
->req_arr
;
2276 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2279 memset(rp
, 0, sizeof (Sg_request
));
2284 if (0 == sfp
->cmd_q
)
2285 resp
= NULL
; /* command queuing disallowed */
2287 for (k
= 0; k
< SG_MAX_QUEUE
; ++k
, ++rp
) {
2291 if (k
< SG_MAX_QUEUE
) {
2292 memset(rp
, 0, sizeof (Sg_request
));
2294 while (resp
->nextrp
)
2295 resp
= resp
->nextrp
;
2303 resp
->nextrp
= NULL
;
2304 resp
->header
.duration
= jiffies_to_msecs(jiffies
);
2306 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2310 /* Return of 1 for found; 0 for not found */
2312 sg_remove_request(Sg_fd
* sfp
, Sg_request
* srp
)
2314 Sg_request
*prev_rp
;
2316 unsigned long iflags
;
2319 if ((!sfp
) || (!srp
) || (!sfp
->headrp
))
2321 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2322 prev_rp
= sfp
->headrp
;
2323 if (srp
== prev_rp
) {
2324 sfp
->headrp
= prev_rp
->nextrp
;
2325 prev_rp
->parentfp
= NULL
;
2328 while ((rp
= prev_rp
->nextrp
)) {
2330 prev_rp
->nextrp
= rp
->nextrp
;
2331 rp
->parentfp
= NULL
;
2338 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2342 #ifdef CONFIG_SCSI_PROC_FS
2344 sg_get_nth_sfp(Sg_device
* sdp
, int nth
)
2347 unsigned long iflags
;
2350 read_lock_irqsave(&sg_index_lock
, iflags
);
2351 for (k
= 0, resp
= sdp
->headfp
; resp
&& (k
< nth
);
2352 ++k
, resp
= resp
->nextfp
) ;
2353 read_unlock_irqrestore(&sg_index_lock
, iflags
);
2359 sg_add_sfp(Sg_device
* sdp
, int dev
)
2362 unsigned long iflags
;
2365 sfp
= kzalloc(sizeof(*sfp
), GFP_ATOMIC
| __GFP_NOWARN
);
2369 init_waitqueue_head(&sfp
->read_wait
);
2370 rwlock_init(&sfp
->rq_list_lock
);
2372 sfp
->timeout
= SG_DEFAULT_TIMEOUT
;
2373 sfp
->timeout_user
= SG_DEFAULT_TIMEOUT_USER
;
2374 sfp
->force_packid
= SG_DEF_FORCE_PACK_ID
;
2375 sfp
->low_dma
= (SG_DEF_FORCE_LOW_DMA
== 0) ?
2376 sdp
->device
->host
->unchecked_isa_dma
: 1;
2377 sfp
->cmd_q
= SG_DEF_COMMAND_Q
;
2378 sfp
->keep_orphan
= SG_DEF_KEEP_ORPHAN
;
2379 sfp
->parentdp
= sdp
;
2380 write_lock_irqsave(&sg_index_lock
, iflags
);
2383 else { /* add to tail of existing list */
2384 Sg_fd
*pfp
= sdp
->headfp
;
2389 write_unlock_irqrestore(&sg_index_lock
, iflags
);
2390 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp
));
2391 if (unlikely(sg_big_buff
!= def_reserved_size
))
2392 sg_big_buff
= def_reserved_size
;
2394 bufflen
= min_t(int, sg_big_buff
,
2395 sdp
->device
->request_queue
->max_sectors
* 512);
2396 sg_build_reserve(sfp
, bufflen
);
2397 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2398 sfp
->reserve
.bufflen
, sfp
->reserve
.k_use_sg
));
2403 __sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2408 prev_fp
= sdp
->headfp
;
2410 sdp
->headfp
= prev_fp
->nextfp
;
2412 while ((fp
= prev_fp
->nextfp
)) {
2414 prev_fp
->nextfp
= fp
->nextfp
;
2420 if (sfp
->reserve
.bufflen
> 0) {
2422 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2423 (int) sfp
->reserve
.bufflen
, (int) sfp
->reserve
.k_use_sg
));
2424 sg_remove_scat(&sfp
->reserve
);
2426 sfp
->parentdp
= NULL
;
2427 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp
));
2431 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2433 sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2440 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
2442 if (sg_srp_done(srp
, sfp
))
2443 sg_finish_rem_req(srp
);
2448 unsigned long iflags
;
2450 write_lock_irqsave(&sg_index_lock
, iflags
);
2451 __sg_remove_sfp(sdp
, sfp
);
2452 if (sdp
->detached
&& (NULL
== sdp
->headfp
)) {
2453 idr_remove(&sg_index_idr
, sdp
->index
);
2457 write_unlock_irqrestore(&sg_index_lock
, iflags
);
2459 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2460 /* only bump the access_count if we actually succeeded in
2461 * throwing another counter on the host module */
2462 scsi_device_get(sdp
->device
); /* XXX: retval ignored? */
2463 sfp
->closed
= 1; /* flag dirty state on this fd */
2464 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2471 sg_res_in_use(Sg_fd
* sfp
)
2473 const Sg_request
*srp
;
2474 unsigned long iflags
;
2476 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2477 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
)
2480 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2484 /* The size fetched (value output via retSzp) set when non-NULL return */
2485 static struct page
*
2486 sg_page_malloc(int rqSz
, int lowDma
, int *retSzp
)
2488 struct page
*resp
= NULL
;
2493 if ((rqSz
<= 0) || (NULL
== retSzp
))
2497 page_mask
= GFP_ATOMIC
| GFP_DMA
| __GFP_COMP
| __GFP_NOWARN
;
2499 page_mask
= GFP_ATOMIC
| __GFP_COMP
| __GFP_NOWARN
;
2501 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< rqSz
;
2502 order
++, a_size
<<= 1) ;
2503 resSz
= a_size
; /* rounded up if necessary */
2504 resp
= alloc_pages(page_mask
, order
);
2505 while ((!resp
) && order
) {
2507 a_size
>>= 1; /* divide by 2, until PAGE_SIZE */
2508 resp
= alloc_pages(page_mask
, order
); /* try half */
2512 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2513 memset(page_address(resp
), 0, resSz
);
2520 sg_page_free(struct page
*page
, int size
)
2526 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< size
;
2527 order
++, a_size
<<= 1) ;
2528 __free_pages(page
, order
);
2531 #ifdef CONFIG_SCSI_PROC_FS
2533 sg_idr_max_id(int id
, void *p
, void *data
)
2547 unsigned long iflags
;
2549 read_lock_irqsave(&sg_index_lock
, iflags
);
2550 idr_for_each(&sg_index_idr
, sg_idr_max_id
, &k
);
2551 read_unlock_irqrestore(&sg_index_lock
, iflags
);
2552 return k
+ 1; /* origin 1 */
2560 unsigned long iflags
;
2562 read_lock_irqsave(&sg_index_lock
, iflags
);
2563 sdp
= idr_find(&sg_index_idr
, dev
);
2564 read_unlock_irqrestore(&sg_index_lock
, iflags
);
2569 #ifdef CONFIG_SCSI_PROC_FS
2571 static struct proc_dir_entry
*sg_proc_sgp
= NULL
;
2573 static char sg_proc_sg_dirname
[] = "scsi/sg";
2575 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
);
2577 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
);
2578 static ssize_t
sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2579 size_t count
, loff_t
*off
);
2580 static struct file_operations adio_fops
= {
2581 /* .owner, .read and .llseek added in sg_proc_init() */
2582 .open
= sg_proc_single_open_adio
,
2583 .write
= sg_proc_write_adio
,
2584 .release
= single_release
,
2587 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
);
2588 static ssize_t
sg_proc_write_dressz(struct file
*filp
,
2589 const char __user
*buffer
, size_t count
, loff_t
*off
);
2590 static struct file_operations dressz_fops
= {
2591 .open
= sg_proc_single_open_dressz
,
2592 .write
= sg_proc_write_dressz
,
2593 .release
= single_release
,
2596 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
);
2597 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
);
2598 static struct file_operations version_fops
= {
2599 .open
= sg_proc_single_open_version
,
2600 .release
= single_release
,
2603 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
);
2604 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
);
2605 static struct file_operations devhdr_fops
= {
2606 .open
= sg_proc_single_open_devhdr
,
2607 .release
= single_release
,
2610 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
);
2611 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
);
2612 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
);
2613 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
);
2614 static void dev_seq_stop(struct seq_file
*s
, void *v
);
2615 static struct file_operations dev_fops
= {
2616 .open
= sg_proc_open_dev
,
2617 .release
= seq_release
,
2619 static struct seq_operations dev_seq_ops
= {
2620 .start
= dev_seq_start
,
2621 .next
= dev_seq_next
,
2622 .stop
= dev_seq_stop
,
2623 .show
= sg_proc_seq_show_dev
,
2626 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
);
2627 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
);
2628 static struct file_operations devstrs_fops
= {
2629 .open
= sg_proc_open_devstrs
,
2630 .release
= seq_release
,
2632 static struct seq_operations devstrs_seq_ops
= {
2633 .start
= dev_seq_start
,
2634 .next
= dev_seq_next
,
2635 .stop
= dev_seq_stop
,
2636 .show
= sg_proc_seq_show_devstrs
,
2639 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
);
2640 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
);
2641 static struct file_operations debug_fops
= {
2642 .open
= sg_proc_open_debug
,
2643 .release
= seq_release
,
2645 static struct seq_operations debug_seq_ops
= {
2646 .start
= dev_seq_start
,
2647 .next
= dev_seq_next
,
2648 .stop
= dev_seq_stop
,
2649 .show
= sg_proc_seq_show_debug
,
2653 struct sg_proc_leaf
{
2655 struct file_operations
* fops
;
2658 static struct sg_proc_leaf sg_proc_leaf_arr
[] = {
2659 {"allow_dio", &adio_fops
},
2660 {"debug", &debug_fops
},
2661 {"def_reserved_size", &dressz_fops
},
2662 {"device_hdr", &devhdr_fops
},
2663 {"devices", &dev_fops
},
2664 {"device_strs", &devstrs_fops
},
2665 {"version", &version_fops
}
2672 int num_leaves
= ARRAY_SIZE(sg_proc_leaf_arr
);
2673 struct sg_proc_leaf
* leaf
;
2675 sg_proc_sgp
= proc_mkdir(sg_proc_sg_dirname
, NULL
);
2678 for (k
= 0; k
< num_leaves
; ++k
) {
2679 leaf
= &sg_proc_leaf_arr
[k
];
2680 mask
= leaf
->fops
->write
? S_IRUGO
| S_IWUSR
: S_IRUGO
;
2681 leaf
->fops
->owner
= THIS_MODULE
;
2682 leaf
->fops
->read
= seq_read
;
2683 leaf
->fops
->llseek
= seq_lseek
;
2684 proc_create(leaf
->name
, mask
, sg_proc_sgp
, leaf
->fops
);
2690 sg_proc_cleanup(void)
2693 int num_leaves
= ARRAY_SIZE(sg_proc_leaf_arr
);
2697 for (k
= 0; k
< num_leaves
; ++k
)
2698 remove_proc_entry(sg_proc_leaf_arr
[k
].name
, sg_proc_sgp
);
2699 remove_proc_entry(sg_proc_sg_dirname
, NULL
);
2703 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
)
2705 seq_printf(s
, "%d\n", *((int *)s
->private));
2709 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
)
2711 return single_open(file
, sg_proc_seq_show_int
, &sg_allow_dio
);
2715 sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2716 size_t count
, loff_t
*off
)
2721 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2723 num
= (count
< 10) ? count
: 10;
2724 if (copy_from_user(buff
, buffer
, num
))
2727 sg_allow_dio
= simple_strtoul(buff
, NULL
, 10) ? 1 : 0;
2731 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
)
2733 return single_open(file
, sg_proc_seq_show_int
, &sg_big_buff
);
2737 sg_proc_write_dressz(struct file
*filp
, const char __user
*buffer
,
2738 size_t count
, loff_t
*off
)
2741 unsigned long k
= ULONG_MAX
;
2744 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2746 num
= (count
< 10) ? count
: 10;
2747 if (copy_from_user(buff
, buffer
, num
))
2750 k
= simple_strtoul(buff
, NULL
, 10);
2751 if (k
<= 1048576) { /* limit "big buff" to 1 MB */
2758 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
)
2760 seq_printf(s
, "%d\t%s [%s]\n", sg_version_num
, SG_VERSION_STR
,
2765 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
)
2767 return single_open(file
, sg_proc_seq_show_version
, NULL
);
2770 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
)
2772 seq_printf(s
, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2777 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
)
2779 return single_open(file
, sg_proc_seq_show_devhdr
, NULL
);
2782 struct sg_proc_deviter
{
2787 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
)
2789 struct sg_proc_deviter
* it
= kmalloc(sizeof(*it
), GFP_KERNEL
);
2796 it
->max
= sg_last_dev();
2797 if (it
->index
>= it
->max
)
2802 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
2804 struct sg_proc_deviter
* it
= s
->private;
2807 return (it
->index
< it
->max
) ? it
: NULL
;
2810 static void dev_seq_stop(struct seq_file
*s
, void *v
)
2815 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
)
2817 return seq_open(file
, &dev_seq_ops
);
2820 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
)
2822 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2824 struct scsi_device
*scsidp
;
2826 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2827 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
2828 seq_printf(s
, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2829 scsidp
->host
->host_no
, scsidp
->channel
,
2830 scsidp
->id
, scsidp
->lun
, (int) scsidp
->type
,
2832 (int) scsidp
->queue_depth
,
2833 (int) scsidp
->device_busy
,
2834 (int) scsi_device_online(scsidp
));
2836 seq_printf(s
, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2840 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
)
2842 return seq_open(file
, &devstrs_seq_ops
);
2845 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
)
2847 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2849 struct scsi_device
*scsidp
;
2851 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2852 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
2853 seq_printf(s
, "%8.8s\t%16.16s\t%4.4s\n",
2854 scsidp
->vendor
, scsidp
->model
, scsidp
->rev
);
2856 seq_printf(s
, "<no active device>\n");
2860 static void sg_proc_debug_helper(struct seq_file
*s
, Sg_device
* sdp
)
2862 int k
, m
, new_interface
, blen
, usg
;
2865 const sg_io_hdr_t
*hp
;
2869 for (k
= 0; (fp
= sg_get_nth_sfp(sdp
, k
)); ++k
) {
2870 seq_printf(s
, " FD(%d): timeout=%dms bufflen=%d "
2871 "(res)sgat=%d low_dma=%d\n", k
+ 1,
2872 jiffies_to_msecs(fp
->timeout
),
2873 fp
->reserve
.bufflen
,
2874 (int) fp
->reserve
.k_use_sg
,
2876 seq_printf(s
, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2877 (int) fp
->cmd_q
, (int) fp
->force_packid
,
2878 (int) fp
->keep_orphan
, (int) fp
->closed
);
2879 for (m
= 0; (srp
= sg_get_nth_request(fp
, m
)); ++m
) {
2881 new_interface
= (hp
->interface_id
== '\0') ? 0 : 1;
2882 if (srp
->res_used
) {
2883 if (new_interface
&&
2884 (SG_FLAG_MMAP_IO
& hp
->flags
))
2889 if (SG_INFO_DIRECT_IO_MASK
& hp
->info
)
2895 blen
= srp
->data
.bufflen
;
2896 usg
= srp
->data
.k_use_sg
;
2897 seq_printf(s
, srp
->done
?
2898 ((1 == srp
->done
) ? "rcv:" : "fin:")
2900 seq_printf(s
, " id=%d blen=%d",
2901 srp
->header
.pack_id
, blen
);
2903 seq_printf(s
, " dur=%d", hp
->duration
);
2905 ms
= jiffies_to_msecs(jiffies
);
2906 seq_printf(s
, " t_o/elap=%d/%d",
2907 (new_interface
? hp
->timeout
:
2908 jiffies_to_msecs(fp
->timeout
)),
2909 (ms
> hp
->duration
? ms
- hp
->duration
: 0));
2911 seq_printf(s
, "ms sgat=%d op=0x%02x\n", usg
,
2912 (int) srp
->data
.cmd_opcode
);
2915 seq_printf(s
, " No requests active\n");
2919 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
)
2921 return seq_open(file
, &debug_seq_ops
);
2924 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
)
2926 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
2929 if (it
&& (0 == it
->index
)) {
2930 seq_printf(s
, "max_active_device=%d(origin 1)\n",
2932 seq_printf(s
, " def_reserved_size=%d\n", sg_big_buff
);
2934 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
2936 struct scsi_device
*scsidp
= sdp
->device
;
2938 if (NULL
== scsidp
) {
2939 seq_printf(s
, "device %d detached ??\n",
2944 if (sg_get_nth_sfp(sdp
, 0)) {
2945 seq_printf(s
, " >>> device=%s ",
2946 sdp
->disk
->disk_name
);
2948 seq_printf(s
, "detached pending close ");
2951 (s
, "scsi%d chan=%d id=%d lun=%d em=%d",
2952 scsidp
->host
->host_no
,
2953 scsidp
->channel
, scsidp
->id
,
2955 scsidp
->host
->hostt
->emulated
);
2956 seq_printf(s
, " sg_tablesize=%d excl=%d\n",
2957 sdp
->sg_tablesize
, sdp
->exclude
);
2959 sg_proc_debug_helper(s
, sdp
);
2964 #endif /* CONFIG_SCSI_PROC_FS */
2966 module_init(init_sg
);
2967 module_exit(exit_sg
);