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
= 30533; /* 2 digits for each component */
22 #define SG_VERSION_STR "3.5.33"
25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING
28 * (otherwise the macros compile to empty statements).
31 #include <linux/config.h>
32 #include <linux/module.h>
35 #include <linux/kernel.h>
36 #include <linux/sched.h>
37 #include <linux/string.h>
39 #include <linux/errno.h>
40 #include <linux/mtio.h>
41 #include <linux/ioctl.h>
42 #include <linux/fcntl.h>
43 #include <linux/init.h>
44 #include <linux/poll.h>
45 #include <linux/smp_lock.h>
46 #include <linux/moduleparam.h>
47 #include <linux/devfs_fs_kernel.h>
48 #include <linux/cdev.h>
49 #include <linux/seq_file.h>
50 #include <linux/blkdev.h>
51 #include <linux/delay.h>
52 #include <linux/scatterlist.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
= "20050908";
67 static int sg_proc_init(void);
68 static void sg_proc_cleanup(void);
71 #ifndef LINUX_VERSION_CODE
72 #include <linux/version.h>
73 #endif /* LINUX_VERSION_CODE */
75 #define SG_ALLOW_DIO_DEF 0
76 #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
78 #define SG_MAX_DEVS 32768
81 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
82 * Then when using 32 bit integers x * m may overflow during the calculation.
83 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
84 * calculates the same, but prevents the overflow when both m and d
85 * are "small" numbers (like HZ and USER_HZ).
86 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
89 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
91 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
93 int sg_big_buff
= SG_DEF_RESERVED_SIZE
;
94 /* N.B. This variable is readable and writeable via
95 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
96 of this size (or less if there is not enough memory) will be reserved
97 for use by this file descriptor. [Deprecated usage: this variable is also
98 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
99 the kernel (i.e. it is not a module).] */
100 static int def_reserved_size
= -1; /* picks up init parameter */
101 static int sg_allow_dio
= SG_ALLOW_DIO_DEF
;
103 #define SG_SECTOR_SZ 512
104 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
106 #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
108 static int sg_add(struct class_device
*, struct class_interface
*);
109 static void sg_remove(struct class_device
*, struct class_interface
*);
111 static Scsi_Request
*dummy_cmdp
; /* only used for sizeof */
113 static DEFINE_RWLOCK(sg_dev_arr_lock
); /* Also used to lock
114 file descriptor list for device */
116 static struct class_interface sg_interface
= {
121 typedef struct sg_scatter_hold
{ /* holding area for scsi scatter gather info */
122 unsigned short k_use_sg
; /* Count of kernel scatter-gather pieces */
123 unsigned short sglist_len
; /* size of malloc'd scatter-gather list ++ */
124 unsigned bufflen
; /* Size of (aggregate) data buffer */
125 unsigned b_malloc_len
; /* actual len malloc'ed in buffer */
126 void *buffer
; /* Data buffer or scatter list (k_use_sg>0) */
127 char dio_in_use
; /* 0->indirect IO (or mmap), 1->dio */
128 unsigned char cmd_opcode
; /* first byte of command */
131 struct sg_device
; /* forward declarations */
134 typedef struct sg_request
{ /* SG_MAX_QUEUE requests outstanding per file */
135 Scsi_Request
*my_cmdp
; /* != 0 when request with lower levels */
136 struct sg_request
*nextrp
; /* NULL -> tail request (slist) */
137 struct sg_fd
*parentfp
; /* NULL -> not in use */
138 Sg_scatter_hold data
; /* hold buffer, perhaps scatter list */
139 sg_io_hdr_t header
; /* scsi command+info, see <scsi/sg.h> */
140 unsigned char sense_b
[sizeof (dummy_cmdp
->sr_sense_buffer
)];
141 char res_used
; /* 1 -> using reserve buffer, 0 -> not ... */
142 char orphan
; /* 1 -> drop on sight, 0 -> normal */
143 char sg_io_owned
; /* 1 -> packet belongs to SG_IO */
144 volatile char done
; /* 0->before bh, 1->before read, 2->read */
147 typedef struct sg_fd
{ /* holds the state of a file descriptor */
148 struct sg_fd
*nextfp
; /* NULL when last opened fd on this device */
149 struct sg_device
*parentdp
; /* owning device */
150 wait_queue_head_t read_wait
; /* queue read until command done */
151 rwlock_t rq_list_lock
; /* protect access to list in req_arr */
152 int timeout
; /* defaults to SG_DEFAULT_TIMEOUT */
153 int timeout_user
; /* defaults to SG_DEFAULT_TIMEOUT_USER */
154 Sg_scatter_hold reserve
; /* buffer held for this file descriptor */
155 unsigned save_scat_len
; /* original length of trunc. scat. element */
156 Sg_request
*headrp
; /* head of request slist, NULL->empty */
157 struct fasync_struct
*async_qp
; /* used by asynchronous notification */
158 Sg_request req_arr
[SG_MAX_QUEUE
]; /* used as singly-linked list */
159 char low_dma
; /* as in parent but possibly overridden to 1 */
160 char force_packid
; /* 1 -> pack_id input to read(), 0 -> ignored */
161 volatile char closed
; /* 1 -> fd closed but request(s) outstanding */
162 char cmd_q
; /* 1 -> allow command queuing, 0 -> don't */
163 char next_cmd_len
; /* 0 -> automatic (def), >0 -> use on next write() */
164 char keep_orphan
; /* 0 -> drop orphan (def), 1 -> keep for read() */
165 char mmap_called
; /* 0 -> mmap() never called on this fd */
168 typedef struct sg_device
{ /* holds the state of each scsi generic device */
169 struct scsi_device
*device
;
170 wait_queue_head_t o_excl_wait
; /* queue open() when O_EXCL in use */
171 int sg_tablesize
; /* adapter's max scatter-gather table size */
172 Sg_fd
*headfp
; /* first open fd belonging to this device */
173 volatile char detached
; /* 0->attached, 1->detached pending removal */
174 volatile char exclude
; /* opened for exclusive access */
175 char sgdebug
; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
176 struct gendisk
*disk
;
177 struct cdev
* cdev
; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
180 static int sg_fasync(int fd
, struct file
*filp
, int mode
);
181 static void sg_cmd_done(Scsi_Cmnd
* SCpnt
); /* tasklet or soft irq callback */
182 static int sg_start_req(Sg_request
* srp
);
183 static void sg_finish_rem_req(Sg_request
* srp
);
184 static int sg_build_indirect(Sg_scatter_hold
* schp
, Sg_fd
* sfp
, int buff_size
);
185 static int sg_build_sgat(Sg_scatter_hold
* schp
, const Sg_fd
* sfp
,
187 static ssize_t
sg_new_read(Sg_fd
* sfp
, char __user
*buf
, size_t count
,
189 static ssize_t
sg_new_write(Sg_fd
* sfp
, const char __user
*buf
, size_t count
,
190 int blocking
, int read_only
, Sg_request
** o_srp
);
191 static int sg_common_write(Sg_fd
* sfp
, Sg_request
* srp
,
192 unsigned char *cmnd
, int timeout
, int blocking
);
193 static int sg_u_iovec(sg_io_hdr_t
* hp
, int sg_num
, int ind
,
194 int wr_xf
, int *countp
, unsigned char __user
**up
);
195 static int sg_write_xfer(Sg_request
* srp
);
196 static int sg_read_xfer(Sg_request
* srp
);
197 static int sg_read_oxfer(Sg_request
* srp
, char __user
*outp
, int num_read_xfer
);
198 static void sg_remove_scat(Sg_scatter_hold
* schp
);
199 static void sg_build_reserve(Sg_fd
* sfp
, int req_size
);
200 static void sg_link_reserve(Sg_fd
* sfp
, Sg_request
* srp
, int size
);
201 static void sg_unlink_reserve(Sg_fd
* sfp
, Sg_request
* srp
);
202 static char *sg_page_malloc(int rqSz
, int lowDma
, int *retSzp
);
203 static void sg_page_free(char *buff
, int size
);
204 static Sg_fd
*sg_add_sfp(Sg_device
* sdp
, int dev
);
205 static int sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
);
206 static void __sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
);
207 static Sg_request
*sg_get_rq_mark(Sg_fd
* sfp
, int pack_id
);
208 static Sg_request
*sg_add_request(Sg_fd
* sfp
);
209 static int sg_remove_request(Sg_fd
* sfp
, Sg_request
* srp
);
210 static int sg_res_in_use(Sg_fd
* sfp
);
211 static int sg_allow_access(unsigned char opcode
, char dev_type
);
212 static int sg_build_direct(Sg_request
* srp
, Sg_fd
* sfp
, int dxfer_len
);
213 static Sg_device
*sg_get_dev(int dev
);
214 static inline unsigned char *sg_scatg2virt(const struct scatterlist
*sclp
);
215 #ifdef CONFIG_SCSI_PROC_FS
216 static int sg_last_dev(void);
219 static Sg_device
**sg_dev_arr
= NULL
;
220 static int sg_dev_max
;
221 static int sg_nr_dev
;
223 #define SZ_SG_HEADER sizeof(struct sg_header)
224 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
225 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
226 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
229 sg_open(struct inode
*inode
, struct file
*filp
)
231 int dev
= iminor(inode
);
232 int flags
= filp
->f_flags
;
238 nonseekable_open(inode
, filp
);
239 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev
, flags
));
240 sdp
= sg_get_dev(dev
);
241 if ((!sdp
) || (!sdp
->device
))
246 /* This driver's module count bumped by fops_get in <linux/fs.h> */
247 /* Prevent the device driver from vanishing while we sleep */
248 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 sdp
->sg_tablesize
= sdp
->device
->host
->sg_tablesize
;
296 if ((sfp
= sg_add_sfp(sdp
, dev
)))
297 filp
->private_data
= sfp
;
300 sdp
->exclude
= 0; /* undo if error */
307 scsi_device_put(sdp
->device
);
311 /* Following function was formerly called 'sg_close' */
313 sg_release(struct inode
*inode
, struct file
*filp
)
318 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
320 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp
->disk
->disk_name
));
321 sg_fasync(-1, filp
, 0); /* remove filp from async notification list */
322 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* Returns 1 when sdp gone */
323 if (!sdp
->detached
) {
324 scsi_device_put(sdp
->device
);
327 wake_up_interruptible(&sdp
->o_excl_wait
);
333 sg_read(struct file
*filp
, char __user
*buf
, size_t count
, loff_t
* ppos
)
338 int req_pack_id
= -1;
340 struct sg_header
*old_hdr
= NULL
;
343 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
345 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
346 sdp
->disk
->disk_name
, (int) count
));
347 if (!access_ok(VERIFY_WRITE
, buf
, count
))
349 if (sfp
->force_packid
&& (count
>= SZ_SG_HEADER
)) {
350 old_hdr
= kmalloc(SZ_SG_HEADER
, GFP_KERNEL
);
353 if (__copy_from_user(old_hdr
, buf
, SZ_SG_HEADER
)) {
357 if (old_hdr
->reply_len
< 0) {
358 if (count
>= SZ_SG_IO_HDR
) {
359 sg_io_hdr_t
*new_hdr
;
360 new_hdr
= kmalloc(SZ_SG_IO_HDR
, GFP_KERNEL
);
365 retval
=__copy_from_user
366 (new_hdr
, buf
, SZ_SG_IO_HDR
);
367 req_pack_id
= new_hdr
->pack_id
;
375 req_pack_id
= old_hdr
->pack_id
;
377 srp
= sg_get_rq_mark(sfp
, req_pack_id
);
378 if (!srp
) { /* now wait on packet to arrive */
383 if (filp
->f_flags
& O_NONBLOCK
) {
388 retval
= 0; /* following macro beats race condition */
389 __wait_event_interruptible(sfp
->read_wait
,
391 (srp
= sg_get_rq_mark(sfp
, req_pack_id
))),
400 /* -ERESTARTSYS as signal hit process */
404 if (srp
->header
.interface_id
!= '\0') {
405 retval
= sg_new_read(sfp
, buf
, count
, srp
);
410 if (old_hdr
== NULL
) {
411 old_hdr
= kmalloc(SZ_SG_HEADER
, GFP_KERNEL
);
417 memset(old_hdr
, 0, SZ_SG_HEADER
);
418 old_hdr
->reply_len
= (int) hp
->timeout
;
419 old_hdr
->pack_len
= old_hdr
->reply_len
; /* old, strange behaviour */
420 old_hdr
->pack_id
= hp
->pack_id
;
421 old_hdr
->twelve_byte
=
422 ((srp
->data
.cmd_opcode
>= 0xc0) && (12 == hp
->cmd_len
)) ? 1 : 0;
423 old_hdr
->target_status
= hp
->masked_status
;
424 old_hdr
->host_status
= hp
->host_status
;
425 old_hdr
->driver_status
= hp
->driver_status
;
426 if ((CHECK_CONDITION
& hp
->masked_status
) ||
427 (DRIVER_SENSE
& hp
->driver_status
))
428 memcpy(old_hdr
->sense_buffer
, srp
->sense_b
,
429 sizeof (old_hdr
->sense_buffer
));
430 switch (hp
->host_status
) {
431 /* This setup of 'result' is for backward compatibility and is best
432 ignored by the user who should use target, host + driver status */
434 case DID_PASSTHROUGH
:
441 old_hdr
->result
= EBUSY
;
448 old_hdr
->result
= EIO
;
451 old_hdr
->result
= (srp
->sense_b
[0] == 0 &&
452 hp
->masked_status
== GOOD
) ? 0 : EIO
;
455 old_hdr
->result
= EIO
;
459 /* Now copy the result back to the user buffer. */
460 if (count
>= SZ_SG_HEADER
) {
461 if (__copy_to_user(buf
, old_hdr
, SZ_SG_HEADER
)) {
466 if (count
> old_hdr
->reply_len
)
467 count
= old_hdr
->reply_len
;
468 if (count
> SZ_SG_HEADER
) {
469 if (sg_read_oxfer(srp
, buf
, count
- SZ_SG_HEADER
)) {
475 count
= (old_hdr
->result
== 0) ? 0 : -EIO
;
476 sg_finish_rem_req(srp
);
484 sg_new_read(Sg_fd
* sfp
, char __user
*buf
, size_t count
, Sg_request
* srp
)
486 sg_io_hdr_t
*hp
= &srp
->header
;
490 if (count
< SZ_SG_IO_HDR
) {
495 if ((hp
->mx_sb_len
> 0) && hp
->sbp
) {
496 if ((CHECK_CONDITION
& hp
->masked_status
) ||
497 (DRIVER_SENSE
& hp
->driver_status
)) {
498 int sb_len
= sizeof (dummy_cmdp
->sr_sense_buffer
);
499 sb_len
= (hp
->mx_sb_len
> sb_len
) ? sb_len
: hp
->mx_sb_len
;
500 len
= 8 + (int) srp
->sense_b
[7]; /* Additional sense length field */
501 len
= (len
> sb_len
) ? sb_len
: len
;
502 if (copy_to_user(hp
->sbp
, srp
->sense_b
, len
)) {
509 if (hp
->masked_status
|| hp
->host_status
|| hp
->driver_status
)
510 hp
->info
|= SG_INFO_CHECK
;
511 if (copy_to_user(buf
, hp
, SZ_SG_IO_HDR
)) {
515 err
= sg_read_xfer(srp
);
517 sg_finish_rem_req(srp
);
518 return (0 == err
) ? count
: err
;
522 sg_write(struct file
*filp
, const char __user
*buf
, size_t count
, loff_t
* ppos
)
524 int mxsize
, cmd_size
, k
;
525 int input_size
, blocking
;
526 unsigned char opcode
;
530 struct sg_header old_hdr
;
532 unsigned char cmnd
[sizeof (dummy_cmdp
->sr_cmnd
)];
534 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
536 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
537 sdp
->disk
->disk_name
, (int) count
));
540 if (!((filp
->f_flags
& O_NONBLOCK
) ||
541 scsi_block_when_processing_errors(sdp
->device
)))
544 if (!access_ok(VERIFY_READ
, buf
, count
))
545 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
546 if (count
< SZ_SG_HEADER
)
548 if (__copy_from_user(&old_hdr
, buf
, SZ_SG_HEADER
))
550 blocking
= !(filp
->f_flags
& O_NONBLOCK
);
551 if (old_hdr
.reply_len
< 0)
552 return sg_new_write(sfp
, buf
, count
, blocking
, 0, NULL
);
553 if (count
< (SZ_SG_HEADER
+ 6))
554 return -EIO
; /* The minimum scsi command length is 6 bytes. */
556 if (!(srp
= sg_add_request(sfp
))) {
557 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
561 __get_user(opcode
, buf
);
562 if (sfp
->next_cmd_len
> 0) {
563 if (sfp
->next_cmd_len
> MAX_COMMAND_SIZE
) {
564 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
565 sfp
->next_cmd_len
= 0;
566 sg_remove_request(sfp
, srp
);
569 cmd_size
= sfp
->next_cmd_len
;
570 sfp
->next_cmd_len
= 0; /* reset so only this write() effected */
572 cmd_size
= COMMAND_SIZE(opcode
); /* based on SCSI command group */
573 if ((opcode
>= 0xc0) && old_hdr
.twelve_byte
)
576 SCSI_LOG_TIMEOUT(4, printk(
577 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode
, cmd_size
));
578 /* Determine buffer size. */
579 input_size
= count
- cmd_size
;
580 mxsize
= (input_size
> old_hdr
.reply_len
) ? input_size
: old_hdr
.reply_len
;
581 mxsize
-= SZ_SG_HEADER
;
582 input_size
-= SZ_SG_HEADER
;
583 if (input_size
< 0) {
584 sg_remove_request(sfp
, srp
);
585 return -EIO
; /* User did not pass enough bytes for this command. */
588 hp
->interface_id
= '\0'; /* indicator of old interface tunnelled */
589 hp
->cmd_len
= (unsigned char) cmd_size
;
593 hp
->dxfer_direction
= (old_hdr
.reply_len
> SZ_SG_HEADER
) ?
594 SG_DXFER_TO_FROM_DEV
: SG_DXFER_TO_DEV
;
596 hp
->dxfer_direction
= (mxsize
> 0) ? SG_DXFER_FROM_DEV
: SG_DXFER_NONE
;
597 hp
->dxfer_len
= mxsize
;
598 hp
->dxferp
= (char __user
*)buf
+ cmd_size
;
600 hp
->timeout
= old_hdr
.reply_len
; /* structure abuse ... */
601 hp
->flags
= input_size
; /* structure abuse ... */
602 hp
->pack_id
= old_hdr
.pack_id
;
604 if (__copy_from_user(cmnd
, buf
, cmd_size
))
607 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
608 * but is is possible that the app intended SG_DXFER_TO_DEV, because there
609 * is a non-zero input_size, so emit a warning.
611 if (hp
->dxfer_direction
== SG_DXFER_TO_FROM_DEV
)
612 if (printk_ratelimit())
614 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
615 "guessing data in;\n" KERN_WARNING
" "
616 "program %s not setting count and/or reply_len properly\n",
617 old_hdr
.reply_len
- (int)SZ_SG_HEADER
,
618 input_size
, (unsigned int) cmnd
[0],
620 k
= sg_common_write(sfp
, srp
, cmnd
, sfp
->timeout
, blocking
);
621 return (k
< 0) ? k
: count
;
625 sg_new_write(Sg_fd
* sfp
, const char __user
*buf
, size_t count
,
626 int blocking
, int read_only
, Sg_request
** o_srp
)
631 unsigned char cmnd
[sizeof (dummy_cmdp
->sr_cmnd
)];
633 unsigned long ul_timeout
;
635 if (count
< SZ_SG_IO_HDR
)
637 if (!access_ok(VERIFY_READ
, buf
, count
))
638 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
640 sfp
->cmd_q
= 1; /* when sg_io_hdr seen, set command queuing on */
641 if (!(srp
= sg_add_request(sfp
))) {
642 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
646 if (__copy_from_user(hp
, buf
, SZ_SG_IO_HDR
)) {
647 sg_remove_request(sfp
, srp
);
650 if (hp
->interface_id
!= 'S') {
651 sg_remove_request(sfp
, srp
);
654 if (hp
->flags
& SG_FLAG_MMAP_IO
) {
655 if (hp
->dxfer_len
> sfp
->reserve
.bufflen
) {
656 sg_remove_request(sfp
, srp
);
657 return -ENOMEM
; /* MMAP_IO size must fit in reserve buffer */
659 if (hp
->flags
& SG_FLAG_DIRECT_IO
) {
660 sg_remove_request(sfp
, srp
);
661 return -EINVAL
; /* either MMAP_IO or DIRECT_IO (not both) */
663 if (sg_res_in_use(sfp
)) {
664 sg_remove_request(sfp
, srp
);
665 return -EBUSY
; /* reserve buffer already being used */
668 ul_timeout
= msecs_to_jiffies(srp
->header
.timeout
);
669 timeout
= (ul_timeout
< INT_MAX
) ? ul_timeout
: INT_MAX
;
670 if ((!hp
->cmdp
) || (hp
->cmd_len
< 6) || (hp
->cmd_len
> sizeof (cmnd
))) {
671 sg_remove_request(sfp
, srp
);
674 if (!access_ok(VERIFY_READ
, hp
->cmdp
, hp
->cmd_len
)) {
675 sg_remove_request(sfp
, srp
);
676 return -EFAULT
; /* protects following copy_from_user()s + get_user()s */
678 if (__copy_from_user(cmnd
, hp
->cmdp
, hp
->cmd_len
)) {
679 sg_remove_request(sfp
, srp
);
683 (!sg_allow_access(cmnd
[0], sfp
->parentdp
->device
->type
))) {
684 sg_remove_request(sfp
, srp
);
687 k
= sg_common_write(sfp
, srp
, cmnd
, timeout
, blocking
);
696 sg_common_write(Sg_fd
* sfp
, Sg_request
* srp
,
697 unsigned char *cmnd
, int timeout
, int blocking
)
701 Sg_device
*sdp
= sfp
->parentdp
;
702 sg_io_hdr_t
*hp
= &srp
->header
;
705 srp
->data
.cmd_opcode
= cmnd
[0]; /* hold opcode of command */
707 hp
->masked_status
= 0;
711 hp
->driver_status
= 0;
713 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
714 (int) cmnd
[0], (int) hp
->cmd_len
));
716 if ((k
= sg_start_req(srp
))) {
717 SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k
));
718 sg_finish_rem_req(srp
);
719 return k
; /* probably out of space --> ENOMEM */
721 if ((k
= sg_write_xfer(srp
))) {
722 SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n"));
723 sg_finish_rem_req(srp
);
727 sg_finish_rem_req(srp
);
730 SRpnt
= scsi_allocate_request(sdp
->device
, GFP_ATOMIC
);
732 SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n"));
733 sg_finish_rem_req(srp
);
737 srp
->my_cmdp
= SRpnt
;
738 q
= SRpnt
->sr_device
->request_queue
;
739 SRpnt
->sr_request
->rq_disk
= sdp
->disk
;
740 SRpnt
->sr_sense_buffer
[0] = 0;
741 SRpnt
->sr_cmd_len
= hp
->cmd_len
;
742 SRpnt
->sr_use_sg
= srp
->data
.k_use_sg
;
743 SRpnt
->sr_sglist_len
= srp
->data
.sglist_len
;
744 SRpnt
->sr_bufflen
= srp
->data
.bufflen
;
745 SRpnt
->sr_underflow
= 0;
746 SRpnt
->sr_buffer
= srp
->data
.buffer
;
747 switch (hp
->dxfer_direction
) {
748 case SG_DXFER_TO_FROM_DEV
:
749 case SG_DXFER_FROM_DEV
:
750 SRpnt
->sr_data_direction
= DMA_FROM_DEVICE
;
752 case SG_DXFER_TO_DEV
:
753 SRpnt
->sr_data_direction
= DMA_TO_DEVICE
;
755 case SG_DXFER_UNKNOWN
:
756 SRpnt
->sr_data_direction
= DMA_BIDIRECTIONAL
;
759 SRpnt
->sr_data_direction
= DMA_NONE
;
762 SRpnt
->upper_private_data
= srp
;
763 srp
->data
.k_use_sg
= 0;
764 srp
->data
.sglist_len
= 0;
765 srp
->data
.bufflen
= 0;
766 srp
->data
.buffer
= NULL
;
767 hp
->duration
= jiffies_to_msecs(jiffies
);
768 /* Now send everything of to mid-level. The next time we hear about this
769 packet is when sg_cmd_done() is called (i.e. a callback). */
770 scsi_do_req(SRpnt
, (void *) cmnd
,
771 (void *) SRpnt
->sr_buffer
, hp
->dxfer_len
,
772 sg_cmd_done
, timeout
, SG_DEFAULT_RETRIES
);
773 /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */
778 sg_srp_done(Sg_request
*srp
, Sg_fd
*sfp
)
780 unsigned long iflags
;
783 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
785 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
790 sg_ioctl(struct inode
*inode
, struct file
*filp
,
791 unsigned int cmd_in
, unsigned long arg
)
793 void __user
*p
= (void __user
*)arg
;
795 int result
, val
, read_only
;
799 unsigned long iflags
;
801 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
803 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
804 sdp
->disk
->disk_name
, (int) cmd_in
));
805 read_only
= (O_RDWR
!= (filp
->f_flags
& O_ACCMODE
));
810 int blocking
= 1; /* ignore O_NONBLOCK flag */
814 if (!scsi_block_when_processing_errors(sdp
->device
))
816 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_IO_HDR
))
819 sg_new_write(sfp
, p
, SZ_SG_IO_HDR
,
820 blocking
, read_only
, &srp
);
823 srp
->sg_io_owned
= 1;
825 result
= 0; /* following macro to beat race condition */
826 __wait_event_interruptible(sfp
->read_wait
,
827 (sdp
->detached
|| sfp
->closed
|| sg_srp_done(srp
, sfp
)),
832 return 0; /* request packet dropped already */
836 return result
; /* -ERESTARTSYS because signal hit process */
838 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
840 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
841 result
= sg_new_read(sfp
, p
, SZ_SG_IO_HDR
, srp
);
842 return (result
< 0) ? result
: 0;
845 result
= get_user(val
, ip
);
850 if (val
>= MULDIV (INT_MAX
, USER_HZ
, HZ
))
851 val
= MULDIV (INT_MAX
, USER_HZ
, HZ
);
852 sfp
->timeout_user
= val
;
853 sfp
->timeout
= MULDIV (val
, HZ
, USER_HZ
);
856 case SG_GET_TIMEOUT
: /* N.B. User receives timeout as return value */
857 /* strange ..., for backward compatibility */
858 return sfp
->timeout_user
;
859 case SG_SET_FORCE_LOW_DMA
:
860 result
= get_user(val
, ip
);
865 if ((0 == sfp
->low_dma
) && (0 == sg_res_in_use(sfp
))) {
866 val
= (int) sfp
->reserve
.bufflen
;
867 sg_remove_scat(&sfp
->reserve
);
868 sg_build_reserve(sfp
, val
);
873 sfp
->low_dma
= sdp
->device
->host
->unchecked_isa_dma
;
877 return put_user((int) sfp
->low_dma
, ip
);
879 if (!access_ok(VERIFY_WRITE
, p
, sizeof (sg_scsi_id_t
)))
882 sg_scsi_id_t __user
*sg_idp
= p
;
886 __put_user((int) sdp
->device
->host
->host_no
,
888 __put_user((int) sdp
->device
->channel
,
890 __put_user((int) sdp
->device
->id
, &sg_idp
->scsi_id
);
891 __put_user((int) sdp
->device
->lun
, &sg_idp
->lun
);
892 __put_user((int) sdp
->device
->type
, &sg_idp
->scsi_type
);
893 __put_user((short) sdp
->device
->host
->cmd_per_lun
,
894 &sg_idp
->h_cmd_per_lun
);
895 __put_user((short) sdp
->device
->queue_depth
,
896 &sg_idp
->d_queue_depth
);
897 __put_user(0, &sg_idp
->unused
[0]);
898 __put_user(0, &sg_idp
->unused
[1]);
901 case SG_SET_FORCE_PACK_ID
:
902 result
= get_user(val
, ip
);
905 sfp
->force_packid
= val
? 1 : 0;
908 if (!access_ok(VERIFY_WRITE
, ip
, sizeof (int)))
910 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
911 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
912 if ((1 == srp
->done
) && (!srp
->sg_io_owned
)) {
913 read_unlock_irqrestore(&sfp
->rq_list_lock
,
915 __put_user(srp
->header
.pack_id
, ip
);
919 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
922 case SG_GET_NUM_WAITING
:
923 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
924 for (val
= 0, srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
925 if ((1 == srp
->done
) && (!srp
->sg_io_owned
))
928 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
929 return put_user(val
, ip
);
930 case SG_GET_SG_TABLESIZE
:
931 return put_user(sdp
->sg_tablesize
, ip
);
932 case SG_SET_RESERVED_SIZE
:
933 result
= get_user(val
, ip
);
938 if (val
!= sfp
->reserve
.bufflen
) {
939 if (sg_res_in_use(sfp
) || sfp
->mmap_called
)
941 sg_remove_scat(&sfp
->reserve
);
942 sg_build_reserve(sfp
, val
);
945 case SG_GET_RESERVED_SIZE
:
946 val
= (int) sfp
->reserve
.bufflen
;
947 return put_user(val
, ip
);
948 case SG_SET_COMMAND_Q
:
949 result
= get_user(val
, ip
);
952 sfp
->cmd_q
= val
? 1 : 0;
954 case SG_GET_COMMAND_Q
:
955 return put_user((int) sfp
->cmd_q
, ip
);
956 case SG_SET_KEEP_ORPHAN
:
957 result
= get_user(val
, ip
);
960 sfp
->keep_orphan
= val
;
962 case SG_GET_KEEP_ORPHAN
:
963 return put_user((int) sfp
->keep_orphan
, ip
);
964 case SG_NEXT_CMD_LEN
:
965 result
= get_user(val
, ip
);
968 sfp
->next_cmd_len
= (val
> 0) ? val
: 0;
970 case SG_GET_VERSION_NUM
:
971 return put_user(sg_version_num
, ip
);
972 case SG_GET_ACCESS_COUNT
:
973 /* faked - we don't have a real access count anymore */
974 val
= (sdp
->device
? 1 : 0);
975 return put_user(val
, ip
);
976 case SG_GET_REQUEST_TABLE
:
977 if (!access_ok(VERIFY_WRITE
, p
, SZ_SG_REQ_INFO
* SG_MAX_QUEUE
))
980 sg_req_info_t
*rinfo
;
983 rinfo
= kmalloc(SZ_SG_REQ_INFO
* SG_MAX_QUEUE
,
987 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
988 for (srp
= sfp
->headrp
, val
= 0; val
< SG_MAX_QUEUE
;
989 ++val
, srp
= srp
? srp
->nextrp
: srp
) {
990 memset(&rinfo
[val
], 0, SZ_SG_REQ_INFO
);
992 rinfo
[val
].req_state
= srp
->done
+ 1;
994 srp
->header
.masked_status
&
995 srp
->header
.host_status
&
996 srp
->header
.driver_status
;
998 rinfo
[val
].duration
=
999 srp
->header
.duration
;
1001 ms
= jiffies_to_msecs(jiffies
);
1002 rinfo
[val
].duration
=
1003 (ms
> srp
->header
.duration
) ?
1004 (ms
- srp
->header
.duration
) : 0;
1006 rinfo
[val
].orphan
= srp
->orphan
;
1007 rinfo
[val
].sg_io_owned
=
1009 rinfo
[val
].pack_id
=
1010 srp
->header
.pack_id
;
1011 rinfo
[val
].usr_ptr
=
1012 srp
->header
.usr_ptr
;
1015 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1016 result
= __copy_to_user(p
, rinfo
,
1017 SZ_SG_REQ_INFO
* SG_MAX_QUEUE
);
1018 result
= result
? -EFAULT
: 0;
1022 case SG_EMULATED_HOST
:
1025 return put_user(sdp
->device
->host
->hostt
->emulated
, ip
);
1029 if (filp
->f_flags
& O_NONBLOCK
) {
1030 if (scsi_host_in_recovery(sdp
->device
->host
))
1032 } else if (!scsi_block_when_processing_errors(sdp
->device
))
1034 result
= get_user(val
, ip
);
1037 if (SG_SCSI_RESET_NOTHING
== val
)
1040 case SG_SCSI_RESET_DEVICE
:
1041 val
= SCSI_TRY_RESET_DEVICE
;
1043 case SG_SCSI_RESET_BUS
:
1044 val
= SCSI_TRY_RESET_BUS
;
1046 case SG_SCSI_RESET_HOST
:
1047 val
= SCSI_TRY_RESET_HOST
;
1052 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
1054 return (scsi_reset_provider(sdp
->device
, val
) ==
1055 SUCCESS
) ? 0 : -EIO
;
1056 case SCSI_IOCTL_SEND_COMMAND
:
1060 unsigned char opcode
= WRITE_6
;
1061 Scsi_Ioctl_Command __user
*siocp
= p
;
1063 if (copy_from_user(&opcode
, siocp
->data
, 1))
1065 if (!sg_allow_access(opcode
, sdp
->device
->type
))
1068 return scsi_ioctl_send_command(sdp
->device
, p
);
1070 result
= get_user(val
, ip
);
1073 sdp
->sgdebug
= (char) val
;
1075 case SCSI_IOCTL_GET_IDLUN
:
1076 case SCSI_IOCTL_GET_BUS_NUMBER
:
1077 case SCSI_IOCTL_PROBE_HOST
:
1078 case SG_GET_TRANSFORM
:
1081 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1084 return -EPERM
; /* don't know so take safe approach */
1085 return scsi_ioctl(sdp
->device
, cmd_in
, p
);
1089 #ifdef CONFIG_COMPAT
1090 static long sg_compat_ioctl(struct file
*filp
, unsigned int cmd_in
, unsigned long arg
)
1094 struct scsi_device
*sdev
;
1096 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1100 if (sdev
->host
->hostt
->compat_ioctl
) {
1103 ret
= sdev
->host
->hostt
->compat_ioctl(sdev
, cmd_in
, (void __user
*)arg
);
1108 return -ENOIOCTLCMD
;
1113 sg_poll(struct file
*filp
, poll_table
* wait
)
1115 unsigned int res
= 0;
1120 unsigned long iflags
;
1122 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
))
1125 poll_wait(filp
, &sfp
->read_wait
, wait
);
1126 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1127 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
) {
1128 /* if any read waiting, flag it */
1129 if ((0 == res
) && (1 == srp
->done
) && (!srp
->sg_io_owned
))
1130 res
= POLLIN
| POLLRDNORM
;
1133 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1137 else if (!sfp
->cmd_q
) {
1139 res
|= POLLOUT
| POLLWRNORM
;
1140 } else if (count
< SG_MAX_QUEUE
)
1141 res
|= POLLOUT
| POLLWRNORM
;
1142 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1143 sdp
->disk
->disk_name
, (int) res
));
1148 sg_fasync(int fd
, struct file
*filp
, int mode
)
1154 if ((!(sfp
= (Sg_fd
*) filp
->private_data
)) || (!(sdp
= sfp
->parentdp
)))
1156 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1157 sdp
->disk
->disk_name
, mode
));
1159 retval
= fasync_helper(fd
, filp
, mode
, &sfp
->async_qp
);
1160 return (retval
< 0) ? retval
: 0;
1163 static inline unsigned char *
1164 sg_scatg2virt(const struct scatterlist
*sclp
)
1166 return (sclp
&& sclp
->page
) ?
1167 (unsigned char *) page_address(sclp
->page
) + sclp
->offset
: NULL
;
1170 /* When startFinish==1 increments page counts for pages other than the
1171 first of scatter gather elements obtained from __get_free_pages().
1172 When startFinish==0 decrements ... */
1174 sg_rb_correct4mmap(Sg_scatter_hold
* rsv_schp
, int startFinish
)
1180 SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n",
1181 startFinish
, rsv_schp
->k_use_sg
));
1182 /* N.B. correction _not_ applied to base page of each allocation */
1183 if (rsv_schp
->k_use_sg
) { /* reserve buffer is a scatter gather list */
1184 struct scatterlist
*sclp
= rsv_schp
->buffer
;
1186 for (k
= 0; k
< rsv_schp
->k_use_sg
; ++k
, ++sclp
) {
1187 for (m
= PAGE_SIZE
; m
< sclp
->length
; m
+= PAGE_SIZE
) {
1188 page_ptr
= sg_scatg2virt(sclp
) + m
;
1189 page
= virt_to_page(page_ptr
);
1193 if (page_count(page
) > 0)
1198 } else { /* reserve buffer is just a single allocation */
1199 for (m
= PAGE_SIZE
; m
< rsv_schp
->bufflen
; m
+= PAGE_SIZE
) {
1200 page_ptr
= (unsigned char *) rsv_schp
->buffer
+ m
;
1201 page
= virt_to_page(page_ptr
);
1205 if (page_count(page
) > 0)
1212 static struct page
*
1213 sg_vma_nopage(struct vm_area_struct
*vma
, unsigned long addr
, int *type
)
1216 struct page
*page
= NOPAGE_SIGBUS
;
1217 void *page_ptr
= NULL
;
1218 unsigned long offset
;
1219 Sg_scatter_hold
*rsv_schp
;
1221 if ((NULL
== vma
) || (!(sfp
= (Sg_fd
*) vma
->vm_private_data
)))
1223 rsv_schp
= &sfp
->reserve
;
1224 offset
= addr
- vma
->vm_start
;
1225 if (offset
>= rsv_schp
->bufflen
)
1227 SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
1228 offset
, rsv_schp
->k_use_sg
));
1229 if (rsv_schp
->k_use_sg
) { /* reserve buffer is a scatter gather list */
1231 unsigned long sa
= vma
->vm_start
;
1233 struct scatterlist
*sclp
= rsv_schp
->buffer
;
1235 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1237 len
= vma
->vm_end
- sa
;
1238 len
= (len
< sclp
->length
) ? len
: sclp
->length
;
1240 page_ptr
= sg_scatg2virt(sclp
) + offset
;
1241 page
= virt_to_page(page_ptr
);
1242 get_page(page
); /* increment page count */
1248 } else { /* reserve buffer is just a single allocation */
1249 page_ptr
= (unsigned char *) rsv_schp
->buffer
+ offset
;
1250 page
= virt_to_page(page_ptr
);
1251 get_page(page
); /* increment page count */
1254 *type
= VM_FAULT_MINOR
;
1258 static struct vm_operations_struct sg_mmap_vm_ops
= {
1259 .nopage
= sg_vma_nopage
,
1263 sg_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
1266 unsigned long req_sz
;
1267 Sg_scatter_hold
*rsv_schp
;
1269 if ((!filp
) || (!vma
) || (!(sfp
= (Sg_fd
*) filp
->private_data
)))
1271 req_sz
= vma
->vm_end
- vma
->vm_start
;
1272 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1273 (void *) vma
->vm_start
, (int) req_sz
));
1275 return -EINVAL
; /* want no offset */
1276 rsv_schp
= &sfp
->reserve
;
1277 if (req_sz
> rsv_schp
->bufflen
)
1278 return -ENOMEM
; /* cannot map more than reserved buffer */
1280 if (rsv_schp
->k_use_sg
) { /* reserve buffer is a scatter gather list */
1282 unsigned long sa
= vma
->vm_start
;
1284 struct scatterlist
*sclp
= rsv_schp
->buffer
;
1286 for (k
= 0; (k
< rsv_schp
->k_use_sg
) && (sa
< vma
->vm_end
);
1288 if (0 != sclp
->offset
)
1289 return -EFAULT
; /* non page aligned memory ?? */
1290 len
= vma
->vm_end
- sa
;
1291 len
= (len
< sclp
->length
) ? len
: sclp
->length
;
1294 } else { /* reserve buffer is just a single allocation */
1295 if ((unsigned long) rsv_schp
->buffer
& (PAGE_SIZE
- 1))
1296 return -EFAULT
; /* non page aligned memory ?? */
1298 if (0 == sfp
->mmap_called
) {
1299 sg_rb_correct4mmap(rsv_schp
, 1); /* do only once per fd lifetime */
1300 sfp
->mmap_called
= 1;
1302 vma
->vm_flags
|= VM_RESERVED
;
1303 vma
->vm_private_data
= sfp
;
1304 vma
->vm_ops
= &sg_mmap_vm_ops
;
1308 /* This function is a "bottom half" handler that is called by the
1309 * mid level when a command is completed (or has failed). */
1311 sg_cmd_done(Scsi_Cmnd
* SCpnt
)
1313 Scsi_Request
*SRpnt
= NULL
;
1314 Sg_device
*sdp
= NULL
;
1316 Sg_request
*srp
= NULL
;
1317 unsigned long iflags
;
1320 if (SCpnt
&& (SRpnt
= SCpnt
->sc_request
))
1321 srp
= (Sg_request
*) SRpnt
->upper_private_data
;
1323 printk(KERN_ERR
"sg_cmd_done: NULL request\n");
1325 scsi_release_request(SRpnt
);
1328 sfp
= srp
->parentfp
;
1330 sdp
= sfp
->parentdp
;
1331 if ((NULL
== sdp
) || sdp
->detached
) {
1332 printk(KERN_INFO
"sg_cmd_done: device detached\n");
1333 scsi_release_request(SRpnt
);
1337 /* First transfer ownership of data buffers to sg_device object. */
1338 srp
->data
.k_use_sg
= SRpnt
->sr_use_sg
;
1339 srp
->data
.sglist_len
= SRpnt
->sr_sglist_len
;
1340 srp
->data
.bufflen
= SRpnt
->sr_bufflen
;
1341 srp
->data
.buffer
= SRpnt
->sr_buffer
;
1342 /* now clear out request structure */
1343 SRpnt
->sr_use_sg
= 0;
1344 SRpnt
->sr_sglist_len
= 0;
1345 SRpnt
->sr_bufflen
= 0;
1346 SRpnt
->sr_buffer
= NULL
;
1347 SRpnt
->sr_underflow
= 0;
1348 SRpnt
->sr_request
->rq_disk
= NULL
; /* "sg" _disowns_ request blk */
1350 srp
->my_cmdp
= NULL
;
1352 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1353 sdp
->disk
->disk_name
, srp
->header
.pack_id
, (int) SRpnt
->sr_result
));
1354 srp
->header
.resid
= SCpnt
->resid
;
1355 ms
= jiffies_to_msecs(jiffies
);
1356 srp
->header
.duration
= (ms
> srp
->header
.duration
) ?
1357 (ms
- srp
->header
.duration
) : 0;
1358 if (0 != SRpnt
->sr_result
) {
1359 struct scsi_sense_hdr sshdr
;
1361 memcpy(srp
->sense_b
, SRpnt
->sr_sense_buffer
,
1362 sizeof (srp
->sense_b
));
1363 srp
->header
.status
= 0xff & SRpnt
->sr_result
;
1364 srp
->header
.masked_status
= status_byte(SRpnt
->sr_result
);
1365 srp
->header
.msg_status
= msg_byte(SRpnt
->sr_result
);
1366 srp
->header
.host_status
= host_byte(SRpnt
->sr_result
);
1367 srp
->header
.driver_status
= driver_byte(SRpnt
->sr_result
);
1368 if ((sdp
->sgdebug
> 0) &&
1369 ((CHECK_CONDITION
== srp
->header
.masked_status
) ||
1370 (COMMAND_TERMINATED
== srp
->header
.masked_status
)))
1371 scsi_print_req_sense("sg_cmd_done", SRpnt
);
1373 /* Following if statement is a patch supplied by Eric Youngdale */
1374 if (driver_byte(SRpnt
->sr_result
) != 0
1375 && scsi_command_normalize_sense(SCpnt
, &sshdr
)
1376 && !scsi_sense_is_deferred(&sshdr
)
1377 && sshdr
.sense_key
== UNIT_ATTENTION
1378 && sdp
->device
->removable
) {
1379 /* Detected possible disc change. Set the bit - this */
1380 /* may be used if there are filesystems using this device */
1381 sdp
->device
->changed
= 1;
1384 /* Rely on write phase to clean out srp status values, so no "else" */
1386 scsi_release_request(SRpnt
);
1388 if (sfp
->closed
) { /* whoops this fd already released, cleanup */
1389 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1390 sg_finish_rem_req(srp
);
1392 if (NULL
== sfp
->headrp
) {
1393 SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n"));
1394 if (0 == sg_remove_sfp(sdp
, sfp
)) { /* device still present */
1395 scsi_device_put(sdp
->device
);
1399 } else if (srp
&& srp
->orphan
) {
1400 if (sfp
->keep_orphan
)
1401 srp
->sg_io_owned
= 0;
1403 sg_finish_rem_req(srp
);
1408 /* Now wake up any sg_read() that is waiting for this packet. */
1409 kill_fasync(&sfp
->async_qp
, SIGPOLL
, POLL_IN
);
1410 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
1412 wake_up_interruptible(&sfp
->read_wait
);
1413 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
1417 static struct file_operations sg_fops
= {
1418 .owner
= THIS_MODULE
,
1423 #ifdef CONFIG_COMPAT
1424 .compat_ioctl
= sg_compat_ioctl
,
1428 .release
= sg_release
,
1429 .fasync
= sg_fasync
,
1432 static struct class *sg_sysfs_class
;
1434 static int sg_sysfs_valid
= 0;
1436 static int sg_alloc(struct gendisk
*disk
, struct scsi_device
*scsidp
)
1439 unsigned long iflags
;
1440 void *old_sg_dev_arr
= NULL
;
1443 sdp
= kmalloc(sizeof(Sg_device
), GFP_KERNEL
);
1445 printk(KERN_WARNING
"kmalloc Sg_device failure\n");
1449 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
1450 if (unlikely(sg_nr_dev
>= sg_dev_max
)) { /* try to resize */
1452 int tmp_dev_max
= sg_nr_dev
+ SG_DEV_ARR_LUMP
;
1453 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1455 tmp_da
= kmalloc(tmp_dev_max
* sizeof(Sg_device
*), GFP_KERNEL
);
1456 if (unlikely(!tmp_da
))
1459 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
1460 memset(tmp_da
, 0, tmp_dev_max
* sizeof(Sg_device
*));
1461 memcpy(tmp_da
, sg_dev_arr
, sg_dev_max
* sizeof(Sg_device
*));
1462 old_sg_dev_arr
= sg_dev_arr
;
1463 sg_dev_arr
= tmp_da
;
1464 sg_dev_max
= tmp_dev_max
;
1467 for (k
= 0; k
< sg_dev_max
; k
++)
1470 if (unlikely(k
>= SG_MAX_DEVS
))
1473 memset(sdp
, 0, sizeof(*sdp
));
1474 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k
));
1475 sprintf(disk
->disk_name
, "sg%d", k
);
1476 disk
->first_minor
= k
;
1478 sdp
->device
= scsidp
;
1479 init_waitqueue_head(&sdp
->o_excl_wait
);
1480 sdp
->sg_tablesize
= scsidp
->host
? scsidp
->host
->sg_tablesize
: 0;
1483 sg_dev_arr
[k
] = sdp
;
1484 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1490 kfree(old_sg_dev_arr
);
1494 printk(KERN_WARNING
"sg_alloc: device array cannot be resized\n");
1499 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1500 sdev_printk(KERN_WARNING
, scsidp
,
1501 "Unable to attach sg device type=%d, minor "
1502 "number exceeds %d\n", scsidp
->type
, SG_MAX_DEVS
- 1);
1508 sg_add(struct class_device
*cl_dev
, struct class_interface
*cl_intf
)
1510 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->dev
);
1511 struct gendisk
*disk
;
1512 Sg_device
*sdp
= NULL
;
1513 struct cdev
* cdev
= NULL
;
1516 disk
= alloc_disk(1);
1518 printk(KERN_WARNING
"alloc_disk failed\n");
1521 disk
->major
= SCSI_GENERIC_MAJOR
;
1524 cdev
= cdev_alloc();
1526 printk(KERN_WARNING
"cdev_alloc failed\n");
1529 cdev
->owner
= THIS_MODULE
;
1530 cdev
->ops
= &sg_fops
;
1532 error
= sg_alloc(disk
, scsidp
);
1534 printk(KERN_WARNING
"sg_alloc failed\n");
1538 sdp
= sg_dev_arr
[k
];
1540 devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR
, k
),
1541 S_IFCHR
| S_IRUSR
| S_IWUSR
| S_IRGRP
,
1542 "%s/generic", scsidp
->devfs_name
);
1543 error
= cdev_add(cdev
, MKDEV(SCSI_GENERIC_MAJOR
, k
), 1);
1545 devfs_remove("%s/generic", scsidp
->devfs_name
);
1549 if (sg_sysfs_valid
) {
1550 struct class_device
* sg_class_member
;
1552 sg_class_member
= class_device_create(sg_sysfs_class
, NULL
,
1553 MKDEV(SCSI_GENERIC_MAJOR
, k
),
1556 if (IS_ERR(sg_class_member
))
1557 printk(KERN_WARNING
"sg_add: "
1558 "class_device_create failed\n");
1559 class_set_devdata(sg_class_member
, sdp
);
1560 error
= sysfs_create_link(&scsidp
->sdev_gendev
.kobj
,
1561 &sg_class_member
->kobj
, "generic");
1563 printk(KERN_ERR
"sg_add: unable to make symlink "
1564 "'generic' back to sg%d\n", k
);
1566 printk(KERN_WARNING
"sg_add: sg_sys INvalid\n");
1568 sdev_printk(KERN_NOTICE
, scsidp
,
1569 "Attached scsi generic sg%d type %d\n", k
,scsidp
->type
);
1581 sg_remove(struct class_device
*cl_dev
, struct class_interface
*cl_intf
)
1583 struct scsi_device
*scsidp
= to_scsi_device(cl_dev
->dev
);
1584 Sg_device
*sdp
= NULL
;
1585 unsigned long iflags
;
1592 if (NULL
== sg_dev_arr
)
1595 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
1596 for (k
= 0; k
< sg_dev_max
; k
++) {
1597 sdp
= sg_dev_arr
[k
];
1598 if ((NULL
== sdp
) || (sdp
->device
!= scsidp
))
1599 continue; /* dirty but lowers nesting */
1602 for (sfp
= sdp
->headfp
; sfp
; sfp
= tsfp
) {
1604 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
1606 if (sfp
->closed
|| (0 == sg_srp_done(srp
, sfp
)))
1607 sg_finish_rem_req(srp
);
1610 scsi_device_put(sdp
->device
);
1611 __sg_remove_sfp(sdp
, sfp
);
1614 wake_up_interruptible(&sfp
->read_wait
);
1615 kill_fasync(&sfp
->async_qp
, SIGPOLL
,
1619 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k
));
1620 if (NULL
== sdp
->headfp
) {
1621 sg_dev_arr
[k
] = NULL
;
1623 } else { /* nothing active, simple case */
1624 SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k
));
1625 sg_dev_arr
[k
] = NULL
;
1630 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
1633 sysfs_remove_link(&scsidp
->sdev_gendev
.kobj
, "generic");
1634 class_device_destroy(sg_sysfs_class
, MKDEV(SCSI_GENERIC_MAJOR
, k
));
1635 cdev_del(sdp
->cdev
);
1637 devfs_remove("%s/generic", scsidp
->devfs_name
);
1638 put_disk(sdp
->disk
);
1640 if (NULL
== sdp
->headfp
)
1641 kfree((char *) sdp
);
1645 msleep(10); /* dirty detach so delay device destruction */
1648 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1649 * of sysfs parameters (which module_param doesn't yet support).
1650 * Sysfs parameters defined explicitly below.
1652 module_param_named(def_reserved_size
, def_reserved_size
, int, S_IRUGO
);
1653 module_param_named(allow_dio
, sg_allow_dio
, int, S_IRUGO
| S_IWUSR
);
1655 MODULE_AUTHOR("Douglas Gilbert");
1656 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1657 MODULE_LICENSE("GPL");
1658 MODULE_VERSION(SG_VERSION_STR
);
1660 MODULE_PARM_DESC(def_reserved_size
, "size of buffer reserved for each fd");
1661 MODULE_PARM_DESC(allow_dio
, "allow direct I/O (default: 0 (disallow))");
1668 if (def_reserved_size
>= 0)
1669 sg_big_buff
= def_reserved_size
;
1671 rc
= register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1675 sg_sysfs_class
= class_create(THIS_MODULE
, "scsi_generic");
1676 if ( IS_ERR(sg_sysfs_class
) ) {
1677 rc
= PTR_ERR(sg_sysfs_class
);
1681 rc
= scsi_register_interface(&sg_interface
);
1683 #ifdef CONFIG_SCSI_PROC_FS
1685 #endif /* CONFIG_SCSI_PROC_FS */
1688 class_destroy(sg_sysfs_class
);
1690 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0), SG_MAX_DEVS
);
1697 #ifdef CONFIG_SCSI_PROC_FS
1699 #endif /* CONFIG_SCSI_PROC_FS */
1700 scsi_unregister_interface(&sg_interface
);
1701 class_destroy(sg_sysfs_class
);
1703 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR
, 0),
1705 kfree((char *)sg_dev_arr
);
1711 sg_start_req(Sg_request
* srp
)
1714 Sg_fd
*sfp
= srp
->parentfp
;
1715 sg_io_hdr_t
*hp
= &srp
->header
;
1716 int dxfer_len
= (int) hp
->dxfer_len
;
1717 int dxfer_dir
= hp
->dxfer_direction
;
1718 Sg_scatter_hold
*req_schp
= &srp
->data
;
1719 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
1721 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len
));
1722 if ((dxfer_len
<= 0) || (dxfer_dir
== SG_DXFER_NONE
))
1724 if (sg_allow_dio
&& (hp
->flags
& SG_FLAG_DIRECT_IO
) &&
1725 (dxfer_dir
!= SG_DXFER_UNKNOWN
) && (0 == hp
->iovec_count
) &&
1726 (!sfp
->parentdp
->device
->host
->unchecked_isa_dma
)) {
1727 res
= sg_build_direct(srp
, sfp
, dxfer_len
);
1728 if (res
<= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
1731 if ((!sg_res_in_use(sfp
)) && (dxfer_len
<= rsv_schp
->bufflen
))
1732 sg_link_reserve(sfp
, srp
, dxfer_len
);
1734 res
= sg_build_indirect(req_schp
, sfp
, dxfer_len
);
1736 sg_remove_scat(req_schp
);
1744 sg_finish_rem_req(Sg_request
* srp
)
1746 Sg_fd
*sfp
= srp
->parentfp
;
1747 Sg_scatter_hold
*req_schp
= &srp
->data
;
1749 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp
->res_used
));
1751 sg_unlink_reserve(sfp
, srp
);
1753 sg_remove_scat(req_schp
);
1754 sg_remove_request(sfp
, srp
);
1758 sg_build_sgat(Sg_scatter_hold
* schp
, const Sg_fd
* sfp
, int tablesize
)
1761 int elem_sz
= sizeof (struct scatterlist
);
1762 int sg_bufflen
= tablesize
* elem_sz
;
1763 int mx_sc_elems
= tablesize
;
1765 schp
->buffer
= sg_page_malloc(sg_bufflen
, sfp
->low_dma
, &ret_sz
);
1768 else if (ret_sz
!= sg_bufflen
) {
1769 sg_bufflen
= ret_sz
;
1770 mx_sc_elems
= sg_bufflen
/ elem_sz
;
1772 schp
->sglist_len
= sg_bufflen
;
1773 memset(schp
->buffer
, 0, sg_bufflen
);
1774 return mx_sc_elems
; /* number of scat_gath elements allocated */
1777 #ifdef SG_ALLOW_DIO_CODE
1778 /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
1779 /* hopefully this generic code will moved to a library */
1781 /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
1782 - mapping of all pages not successful
1783 - any page is above max_pfn
1784 (i.e., either completely successful or fails)
1787 st_map_user_pages(struct scatterlist
*sgl
, const unsigned int max_pages
,
1788 unsigned long uaddr
, size_t count
, int rw
,
1789 unsigned long max_pfn
)
1791 unsigned long end
= (uaddr
+ count
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
1792 unsigned long start
= uaddr
>> PAGE_SHIFT
;
1793 const int nr_pages
= end
- start
;
1795 struct page
**pages
;
1797 /* User attempted Overflow! */
1798 if ((uaddr
+ count
) < uaddr
)
1802 if (nr_pages
> max_pages
)
1809 if ((pages
= kmalloc(max_pages
* sizeof(*pages
), GFP_ATOMIC
)) == NULL
)
1812 /* Try to fault in all of the necessary pages */
1813 down_read(¤t
->mm
->mmap_sem
);
1814 /* rw==READ means read from drive, write into memory area */
1815 res
= get_user_pages(
1821 0, /* don't force */
1824 up_read(¤t
->mm
->mmap_sem
);
1826 /* Errors and no page mapped should return here */
1830 for (i
=0; i
< nr_pages
; i
++) {
1831 /* FIXME: flush superflous for rw==READ,
1832 * probably wrong function for rw==WRITE
1834 flush_dcache_page(pages
[i
]);
1835 if (page_to_pfn(pages
[i
]) > max_pfn
)
1837 /* ?? Is locking needed? I don't think so */
1838 /* if (TestSetPageLocked(pages[i]))
1842 /* Populate the scatter/gather list */
1843 sgl
[0].page
= pages
[0];
1844 sgl
[0].offset
= uaddr
& ~PAGE_MASK
;
1846 sgl
[0].length
= PAGE_SIZE
- sgl
[0].offset
;
1847 count
-= sgl
[0].length
;
1848 for (i
=1; i
< nr_pages
; i
++) {
1850 sgl
[i
].page
= pages
[i
];
1851 sgl
[i
].length
= count
< PAGE_SIZE
? count
: PAGE_SIZE
;
1856 sgl
[0].length
= count
;
1863 /* for (j=0; j < i; j++)
1864 unlock_page(pages[j]); */
1868 for (j
=0; j
< res
; j
++)
1869 page_cache_release(pages
[j
]);
1875 /* And unmap them... */
1877 st_unmap_user_pages(struct scatterlist
*sgl
, const unsigned int nr_pages
,
1882 for (i
=0; i
< nr_pages
; i
++) {
1883 struct page
*page
= sgl
[i
].page
;
1885 /* XXX: just for debug. Remove when PageReserved is removed */
1886 BUG_ON(PageReserved(page
));
1889 /* unlock_page(page); */
1890 /* FIXME: cache flush missing for rw==READ
1891 * FIXME: call the correct reference counting function
1893 page_cache_release(page
);
1899 /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
1903 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1905 sg_build_direct(Sg_request
* srp
, Sg_fd
* sfp
, int dxfer_len
)
1907 #ifdef SG_ALLOW_DIO_CODE
1908 sg_io_hdr_t
*hp
= &srp
->header
;
1909 Sg_scatter_hold
*schp
= &srp
->data
;
1910 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1911 struct scatterlist
*sgl
;
1912 int mx_sc_elems
, res
;
1913 struct scsi_device
*sdev
= sfp
->parentdp
->device
;
1915 if (((unsigned long)hp
->dxferp
&
1916 queue_dma_alignment(sdev
->request_queue
)) != 0)
1918 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1919 if (mx_sc_elems
<= 0) {
1922 sgl
= (struct scatterlist
*)schp
->buffer
;
1923 res
= st_map_user_pages(sgl
, mx_sc_elems
, (unsigned long)hp
->dxferp
, dxfer_len
,
1924 (SG_DXFER_TO_DEV
== hp
->dxfer_direction
) ? 1 : 0, ULONG_MAX
);
1927 schp
->k_use_sg
= res
;
1928 schp
->dio_in_use
= 1;
1929 hp
->info
|= SG_INFO_DIRECT_IO
;
1937 sg_build_indirect(Sg_scatter_hold
* schp
, Sg_fd
* sfp
, int buff_size
)
1940 int blk_size
= buff_size
;
1941 unsigned char *p
= NULL
;
1943 if ((blk_size
< 0) || (!sfp
))
1946 ++blk_size
; /* don't know why */
1947 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1948 blk_size
= (blk_size
+ SG_SECTOR_MSK
) & (~SG_SECTOR_MSK
);
1949 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1950 buff_size
, blk_size
));
1951 if (blk_size
<= SG_SCATTER_SZ
) {
1952 p
= sg_page_malloc(blk_size
, sfp
->low_dma
, &ret_sz
);
1955 if (blk_size
== ret_sz
) { /* got it on the first attempt */
1958 schp
->bufflen
= blk_size
;
1959 schp
->b_malloc_len
= blk_size
;
1963 p
= sg_page_malloc(SG_SCATTER_SZ
, sfp
->low_dma
, &ret_sz
);
1967 /* Want some local declarations, so start new block ... */
1968 { /* lets try and build a scatter gather list */
1969 struct scatterlist
*sclp
;
1972 int sg_tablesize
= sfp
->parentdp
->sg_tablesize
;
1975 /* N.B. ret_sz carried into this block ... */
1976 mx_sc_elems
= sg_build_sgat(schp
, sfp
, sg_tablesize
);
1977 if (mx_sc_elems
< 0)
1978 return mx_sc_elems
; /* most likely -ENOMEM */
1980 for (k
= 0, sclp
= schp
->buffer
, rem_sz
= blk_size
;
1981 (rem_sz
> 0) && (k
< mx_sc_elems
);
1982 ++k
, rem_sz
-= ret_sz
, ++sclp
) {
1988 SG_SCATTER_SZ
) ? SG_SCATTER_SZ
: rem_sz
;
1989 p
= sg_page_malloc(num
, sfp
->low_dma
, &ret_sz
);
1993 sg_set_buf(sclp
, p
, ret_sz
);
1995 SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n",
1996 k
, sg_scatg2virt(sclp
), ret_sz
));
1997 } /* end of for loop */
1999 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k
, rem_sz
));
2000 schp
->bufflen
= blk_size
;
2001 if (rem_sz
> 0) /* must have failed */
2008 sg_write_xfer(Sg_request
* srp
)
2010 sg_io_hdr_t
*hp
= &srp
->header
;
2011 Sg_scatter_hold
*schp
= &srp
->data
;
2013 int j
, k
, onum
, usglen
, ksglen
, res
;
2014 int iovec_count
= (int) hp
->iovec_count
;
2015 int dxfer_dir
= hp
->dxfer_direction
;
2017 unsigned char __user
*up
;
2018 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
2020 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_TO_DEV
== dxfer_dir
) ||
2021 (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
2022 num_xfer
= (int) (new_interface
? hp
->dxfer_len
: hp
->flags
);
2023 if (schp
->bufflen
< num_xfer
)
2024 num_xfer
= schp
->bufflen
;
2026 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
2028 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
2031 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2032 num_xfer
, iovec_count
, schp
->k_use_sg
));
2035 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
2040 if (0 == schp
->k_use_sg
) { /* kernel has single buffer */
2041 for (j
= 0, p
= schp
->buffer
; j
< onum
; ++j
) {
2042 res
= sg_u_iovec(hp
, iovec_count
, j
, 1, &usglen
, &up
);
2045 usglen
= (num_xfer
> usglen
) ? usglen
: num_xfer
;
2046 if (__copy_from_user(p
, up
, usglen
))
2053 } else { /* kernel using scatter gather list */
2054 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2056 ksglen
= (int) sclp
->length
;
2057 p
= sg_scatg2virt(sclp
);
2058 for (j
= 0, k
= 0; j
< onum
; ++j
) {
2059 res
= sg_u_iovec(hp
, iovec_count
, j
, 1, &usglen
, &up
);
2063 for (; p
; ++sclp
, ksglen
= (int) sclp
->length
,
2064 p
= sg_scatg2virt(sclp
)) {
2067 if (ksglen
> usglen
) {
2068 if (usglen
>= num_xfer
) {
2069 if (__copy_from_user
2074 if (__copy_from_user(p
, up
, usglen
))
2080 if (ksglen
>= num_xfer
) {
2081 if (__copy_from_user
2086 if (__copy_from_user(p
, up
, ksglen
))
2092 if (k
>= schp
->k_use_sg
)
2101 sg_u_iovec(sg_io_hdr_t
* hp
, int sg_num
, int ind
,
2102 int wr_xf
, int *countp
, unsigned char __user
**up
)
2104 int num_xfer
= (int) hp
->dxfer_len
;
2105 unsigned char __user
*p
= hp
->dxferp
;
2109 if (wr_xf
&& ('\0' == hp
->interface_id
))
2110 count
= (int) hp
->flags
; /* holds "old" input_size */
2115 if (__copy_from_user(&iovec
, p
+ ind
*SZ_SG_IOVEC
, SZ_SG_IOVEC
))
2118 count
= (int) iovec
.iov_len
;
2120 if (!access_ok(wr_xf
? VERIFY_READ
: VERIFY_WRITE
, p
, count
))
2130 sg_remove_scat(Sg_scatter_hold
* schp
)
2132 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp
->k_use_sg
));
2133 if (schp
->buffer
&& (schp
->sglist_len
> 0)) {
2134 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2136 if (schp
->dio_in_use
) {
2137 #ifdef SG_ALLOW_DIO_CODE
2138 st_unmap_user_pages(sclp
, schp
->k_use_sg
, TRUE
);
2143 for (k
= 0; (k
< schp
->k_use_sg
) && sg_scatg2virt(sclp
);
2145 SCSI_LOG_TIMEOUT(5, printk(
2146 "sg_remove_scat: k=%d, a=0x%p, len=%d\n",
2147 k
, sg_scatg2virt(sclp
), sclp
->length
));
2148 sg_page_free(sg_scatg2virt(sclp
), sclp
->length
);
2154 sg_page_free(schp
->buffer
, schp
->sglist_len
);
2155 } else if (schp
->buffer
)
2156 sg_page_free(schp
->buffer
, schp
->b_malloc_len
);
2157 memset(schp
, 0, sizeof (*schp
));
2161 sg_read_xfer(Sg_request
* srp
)
2163 sg_io_hdr_t
*hp
= &srp
->header
;
2164 Sg_scatter_hold
*schp
= &srp
->data
;
2166 int j
, k
, onum
, usglen
, ksglen
, res
;
2167 int iovec_count
= (int) hp
->iovec_count
;
2168 int dxfer_dir
= hp
->dxfer_direction
;
2170 unsigned char __user
*up
;
2171 int new_interface
= ('\0' == hp
->interface_id
) ? 0 : 1;
2173 if ((SG_DXFER_UNKNOWN
== dxfer_dir
) || (SG_DXFER_FROM_DEV
== dxfer_dir
)
2174 || (SG_DXFER_TO_FROM_DEV
== dxfer_dir
)) {
2175 num_xfer
= hp
->dxfer_len
;
2176 if (schp
->bufflen
< num_xfer
)
2177 num_xfer
= schp
->bufflen
;
2179 if ((num_xfer
<= 0) || (schp
->dio_in_use
) ||
2181 && ((SG_FLAG_NO_DXFER
| SG_FLAG_MMAP_IO
) & hp
->flags
)))
2184 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
2185 num_xfer
, iovec_count
, schp
->k_use_sg
));
2188 if (!access_ok(VERIFY_READ
, hp
->dxferp
, SZ_SG_IOVEC
* onum
))
2193 if (0 == schp
->k_use_sg
) { /* kernel has single buffer */
2194 for (j
= 0, p
= schp
->buffer
; j
< onum
; ++j
) {
2195 res
= sg_u_iovec(hp
, iovec_count
, j
, 0, &usglen
, &up
);
2198 usglen
= (num_xfer
> usglen
) ? usglen
: num_xfer
;
2199 if (__copy_to_user(up
, p
, usglen
))
2206 } else { /* kernel using scatter gather list */
2207 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2209 ksglen
= (int) sclp
->length
;
2210 p
= sg_scatg2virt(sclp
);
2211 for (j
= 0, k
= 0; j
< onum
; ++j
) {
2212 res
= sg_u_iovec(hp
, iovec_count
, j
, 0, &usglen
, &up
);
2216 for (; p
; ++sclp
, ksglen
= (int) sclp
->length
,
2217 p
= sg_scatg2virt(sclp
)) {
2220 if (ksglen
> usglen
) {
2221 if (usglen
>= num_xfer
) {
2227 if (__copy_to_user(up
, p
, usglen
))
2233 if (ksglen
>= num_xfer
) {
2239 if (__copy_to_user(up
, p
, ksglen
))
2245 if (k
>= schp
->k_use_sg
)
2254 sg_read_oxfer(Sg_request
* srp
, char __user
*outp
, int num_read_xfer
)
2256 Sg_scatter_hold
*schp
= &srp
->data
;
2258 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
2260 if ((!outp
) || (num_read_xfer
<= 0))
2262 if (schp
->k_use_sg
> 0) {
2264 struct scatterlist
*sclp
= (struct scatterlist
*) schp
->buffer
;
2266 for (k
= 0; (k
< schp
->k_use_sg
) && sg_scatg2virt(sclp
);
2268 num
= (int) sclp
->length
;
2269 if (num
> num_read_xfer
) {
2271 (outp
, sg_scatg2virt(sclp
), num_read_xfer
))
2276 (outp
, sg_scatg2virt(sclp
), num
))
2278 num_read_xfer
-= num
;
2279 if (num_read_xfer
<= 0)
2285 if (__copy_to_user(outp
, schp
->buffer
, num_read_xfer
))
2292 sg_build_reserve(Sg_fd
* sfp
, int req_size
)
2294 Sg_scatter_hold
*schp
= &sfp
->reserve
;
2296 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size
));
2298 if (req_size
< PAGE_SIZE
)
2299 req_size
= PAGE_SIZE
;
2300 if (0 == sg_build_indirect(schp
, sfp
, req_size
))
2303 sg_remove_scat(schp
);
2304 req_size
>>= 1; /* divide by 2 */
2305 } while (req_size
> (PAGE_SIZE
/ 2));
2309 sg_link_reserve(Sg_fd
* sfp
, Sg_request
* srp
, int size
)
2311 Sg_scatter_hold
*req_schp
= &srp
->data
;
2312 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2315 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size
));
2316 size
= (size
+ 1) & (~1); /* round to even for aha1542 */
2317 if (rsv_schp
->k_use_sg
> 0) {
2320 struct scatterlist
*sclp
=
2321 (struct scatterlist
*) rsv_schp
->buffer
;
2323 for (k
= 0; k
< rsv_schp
->k_use_sg
; ++k
, ++sclp
) {
2324 num
= (int) sclp
->length
;
2327 req_schp
->k_use_sg
= 0;
2328 req_schp
->buffer
= sg_scatg2virt(sclp
);
2330 sfp
->save_scat_len
= num
;
2331 sclp
->length
= (unsigned) rem
;
2332 req_schp
->k_use_sg
= k
+ 1;
2333 req_schp
->sglist_len
=
2334 rsv_schp
->sglist_len
;
2335 req_schp
->buffer
= rsv_schp
->buffer
;
2337 req_schp
->bufflen
= size
;
2338 req_schp
->b_malloc_len
= rsv_schp
->b_malloc_len
;
2343 if (k
>= rsv_schp
->k_use_sg
)
2344 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2346 req_schp
->k_use_sg
= 0;
2347 req_schp
->bufflen
= size
;
2348 req_schp
->buffer
= rsv_schp
->buffer
;
2349 req_schp
->b_malloc_len
= rsv_schp
->b_malloc_len
;
2354 sg_unlink_reserve(Sg_fd
* sfp
, Sg_request
* srp
)
2356 Sg_scatter_hold
*req_schp
= &srp
->data
;
2357 Sg_scatter_hold
*rsv_schp
= &sfp
->reserve
;
2359 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2360 (int) req_schp
->k_use_sg
));
2361 if ((rsv_schp
->k_use_sg
> 0) && (req_schp
->k_use_sg
> 0)) {
2362 struct scatterlist
*sclp
=
2363 (struct scatterlist
*) rsv_schp
->buffer
;
2365 if (sfp
->save_scat_len
> 0)
2366 (sclp
+ (req_schp
->k_use_sg
- 1))->length
=
2367 (unsigned) sfp
->save_scat_len
;
2369 SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
2371 req_schp
->k_use_sg
= 0;
2372 req_schp
->bufflen
= 0;
2373 req_schp
->buffer
= NULL
;
2374 req_schp
->sglist_len
= 0;
2375 sfp
->save_scat_len
= 0;
2380 sg_get_rq_mark(Sg_fd
* sfp
, int pack_id
)
2383 unsigned long iflags
;
2385 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2386 for (resp
= sfp
->headrp
; resp
; resp
= resp
->nextrp
) {
2387 /* look for requests that are ready + not SG_IO owned */
2388 if ((1 == resp
->done
) && (!resp
->sg_io_owned
) &&
2389 ((-1 == pack_id
) || (resp
->header
.pack_id
== pack_id
))) {
2390 resp
->done
= 2; /* guard against other readers */
2394 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2398 #ifdef CONFIG_SCSI_PROC_FS
2400 sg_get_nth_request(Sg_fd
* sfp
, int nth
)
2403 unsigned long iflags
;
2406 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2407 for (k
= 0, resp
= sfp
->headrp
; resp
&& (k
< nth
);
2408 ++k
, resp
= resp
->nextrp
) ;
2409 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2414 /* always adds to end of list */
2416 sg_add_request(Sg_fd
* sfp
)
2419 unsigned long iflags
;
2421 Sg_request
*rp
= sfp
->req_arr
;
2423 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2426 memset(rp
, 0, sizeof (Sg_request
));
2431 if (0 == sfp
->cmd_q
)
2432 resp
= NULL
; /* command queuing disallowed */
2434 for (k
= 0; k
< SG_MAX_QUEUE
; ++k
, ++rp
) {
2438 if (k
< SG_MAX_QUEUE
) {
2439 memset(rp
, 0, sizeof (Sg_request
));
2441 while (resp
->nextrp
)
2442 resp
= resp
->nextrp
;
2450 resp
->nextrp
= NULL
;
2451 resp
->header
.duration
= jiffies_to_msecs(jiffies
);
2452 resp
->my_cmdp
= NULL
;
2454 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2458 /* Return of 1 for found; 0 for not found */
2460 sg_remove_request(Sg_fd
* sfp
, Sg_request
* srp
)
2462 Sg_request
*prev_rp
;
2464 unsigned long iflags
;
2467 if ((!sfp
) || (!srp
) || (!sfp
->headrp
))
2469 write_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2471 srp
->my_cmdp
->upper_private_data
= NULL
;
2472 prev_rp
= sfp
->headrp
;
2473 if (srp
== prev_rp
) {
2474 sfp
->headrp
= prev_rp
->nextrp
;
2475 prev_rp
->parentfp
= NULL
;
2478 while ((rp
= prev_rp
->nextrp
)) {
2480 prev_rp
->nextrp
= rp
->nextrp
;
2481 rp
->parentfp
= NULL
;
2488 write_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2492 #ifdef CONFIG_SCSI_PROC_FS
2494 sg_get_nth_sfp(Sg_device
* sdp
, int nth
)
2497 unsigned long iflags
;
2500 read_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2501 for (k
= 0, resp
= sdp
->headfp
; resp
&& (k
< nth
);
2502 ++k
, resp
= resp
->nextfp
) ;
2503 read_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2509 sg_add_sfp(Sg_device
* sdp
, int dev
)
2512 unsigned long iflags
;
2514 sfp
= (Sg_fd
*) sg_page_malloc(sizeof (Sg_fd
), 0, NULL
);
2517 memset(sfp
, 0, sizeof (Sg_fd
));
2518 init_waitqueue_head(&sfp
->read_wait
);
2519 rwlock_init(&sfp
->rq_list_lock
);
2521 sfp
->timeout
= SG_DEFAULT_TIMEOUT
;
2522 sfp
->timeout_user
= SG_DEFAULT_TIMEOUT_USER
;
2523 sfp
->force_packid
= SG_DEF_FORCE_PACK_ID
;
2524 sfp
->low_dma
= (SG_DEF_FORCE_LOW_DMA
== 0) ?
2525 sdp
->device
->host
->unchecked_isa_dma
: 1;
2526 sfp
->cmd_q
= SG_DEF_COMMAND_Q
;
2527 sfp
->keep_orphan
= SG_DEF_KEEP_ORPHAN
;
2528 sfp
->parentdp
= sdp
;
2529 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2532 else { /* add to tail of existing list */
2533 Sg_fd
*pfp
= sdp
->headfp
;
2538 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2539 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp
));
2540 sg_build_reserve(sfp
, sg_big_buff
);
2541 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2542 sfp
->reserve
.bufflen
, sfp
->reserve
.k_use_sg
));
2547 __sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2552 prev_fp
= sdp
->headfp
;
2554 sdp
->headfp
= prev_fp
->nextfp
;
2556 while ((fp
= prev_fp
->nextfp
)) {
2558 prev_fp
->nextfp
= fp
->nextfp
;
2564 if (sfp
->reserve
.bufflen
> 0) {
2566 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2567 (int) sfp
->reserve
.bufflen
, (int) sfp
->reserve
.k_use_sg
));
2568 if (sfp
->mmap_called
)
2569 sg_rb_correct4mmap(&sfp
->reserve
, 0); /* undo correction */
2570 sg_remove_scat(&sfp
->reserve
);
2572 sfp
->parentdp
= NULL
;
2573 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp
));
2574 sg_page_free((char *) sfp
, sizeof (Sg_fd
));
2577 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2579 sg_remove_sfp(Sg_device
* sdp
, Sg_fd
* sfp
)
2586 for (srp
= sfp
->headrp
; srp
; srp
= tsrp
) {
2588 if (sg_srp_done(srp
, sfp
))
2589 sg_finish_rem_req(srp
);
2594 unsigned long iflags
;
2596 write_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2597 __sg_remove_sfp(sdp
, sfp
);
2598 if (sdp
->detached
&& (NULL
== sdp
->headfp
)) {
2602 for (k
= 0; k
< maxd
; ++k
) {
2603 if (sdp
== sg_dev_arr
[k
])
2607 sg_dev_arr
[k
] = NULL
;
2608 kfree((char *) sdp
);
2611 write_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2613 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2614 /* only bump the access_count if we actually succeeded in
2615 * throwing another counter on the host module */
2616 scsi_device_get(sdp
->device
); /* XXX: retval ignored? */
2617 sfp
->closed
= 1; /* flag dirty state on this fd */
2618 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2625 sg_res_in_use(Sg_fd
* sfp
)
2627 const Sg_request
*srp
;
2628 unsigned long iflags
;
2630 read_lock_irqsave(&sfp
->rq_list_lock
, iflags
);
2631 for (srp
= sfp
->headrp
; srp
; srp
= srp
->nextrp
)
2634 read_unlock_irqrestore(&sfp
->rq_list_lock
, iflags
);
2638 /* If retSzp==NULL want exact size or fail */
2640 sg_page_malloc(int rqSz
, int lowDma
, int *retSzp
)
2651 page_mask
= GFP_ATOMIC
| GFP_DMA
| __GFP_NOWARN
;
2653 page_mask
= GFP_ATOMIC
| __GFP_NOWARN
;
2655 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< rqSz
;
2656 order
++, a_size
<<= 1) ;
2657 resp
= (char *) __get_free_pages(page_mask
, order
);
2658 while ((!resp
) && order
&& retSzp
) {
2660 a_size
>>= 1; /* divide by 2, until PAGE_SIZE */
2661 resp
= (char *) __get_free_pages(page_mask
, order
); /* try half */
2665 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2666 memset(resp
, 0, resSz
);
2674 sg_page_free(char *buff
, int size
)
2680 for (order
= 0, a_size
= PAGE_SIZE
; a_size
< size
;
2681 order
++, a_size
<<= 1) ;
2682 free_pages((unsigned long) buff
, order
);
2685 #ifndef MAINTENANCE_IN_CMD
2686 #define MAINTENANCE_IN_CMD 0xa3
2689 static unsigned char allow_ops
[] = { TEST_UNIT_READY
, REQUEST_SENSE
,
2690 INQUIRY
, READ_CAPACITY
, READ_BUFFER
, READ_6
, READ_10
, READ_12
,
2691 READ_16
, MODE_SENSE
, MODE_SENSE_10
, LOG_SENSE
, REPORT_LUNS
,
2692 SERVICE_ACTION_IN
, RECEIVE_DIAGNOSTIC
, READ_LONG
, MAINTENANCE_IN_CMD
2696 sg_allow_access(unsigned char opcode
, char dev_type
)
2700 if (TYPE_SCANNER
== dev_type
) /* TYPE_ROM maybe burner */
2702 for (k
= 0; k
< sizeof (allow_ops
); ++k
) {
2703 if (opcode
== allow_ops
[k
])
2709 #ifdef CONFIG_SCSI_PROC_FS
2714 unsigned long iflags
;
2716 read_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2717 for (k
= sg_dev_max
- 1; k
>= 0; --k
)
2718 if (sg_dev_arr
[k
] && sg_dev_arr
[k
]->device
)
2720 read_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2721 return k
+ 1; /* origin 1 */
2728 Sg_device
*sdp
= NULL
;
2729 unsigned long iflags
;
2731 if (sg_dev_arr
&& (dev
>= 0)) {
2732 read_lock_irqsave(&sg_dev_arr_lock
, iflags
);
2733 if (dev
< sg_dev_max
)
2734 sdp
= sg_dev_arr
[dev
];
2735 read_unlock_irqrestore(&sg_dev_arr_lock
, iflags
);
2740 #ifdef CONFIG_SCSI_PROC_FS
2742 static struct proc_dir_entry
*sg_proc_sgp
= NULL
;
2744 static char sg_proc_sg_dirname
[] = "scsi/sg";
2746 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
);
2748 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
);
2749 static ssize_t
sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2750 size_t count
, loff_t
*off
);
2751 static struct file_operations adio_fops
= {
2752 /* .owner, .read and .llseek added in sg_proc_init() */
2753 .open
= sg_proc_single_open_adio
,
2754 .write
= sg_proc_write_adio
,
2755 .release
= single_release
,
2758 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
);
2759 static ssize_t
sg_proc_write_dressz(struct file
*filp
,
2760 const char __user
*buffer
, size_t count
, loff_t
*off
);
2761 static struct file_operations dressz_fops
= {
2762 .open
= sg_proc_single_open_dressz
,
2763 .write
= sg_proc_write_dressz
,
2764 .release
= single_release
,
2767 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
);
2768 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
);
2769 static struct file_operations version_fops
= {
2770 .open
= sg_proc_single_open_version
,
2771 .release
= single_release
,
2774 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
);
2775 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
);
2776 static struct file_operations devhdr_fops
= {
2777 .open
= sg_proc_single_open_devhdr
,
2778 .release
= single_release
,
2781 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
);
2782 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
);
2783 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
);
2784 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
);
2785 static void dev_seq_stop(struct seq_file
*s
, void *v
);
2786 static struct file_operations dev_fops
= {
2787 .open
= sg_proc_open_dev
,
2788 .release
= seq_release
,
2790 static struct seq_operations dev_seq_ops
= {
2791 .start
= dev_seq_start
,
2792 .next
= dev_seq_next
,
2793 .stop
= dev_seq_stop
,
2794 .show
= sg_proc_seq_show_dev
,
2797 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
);
2798 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
);
2799 static struct file_operations devstrs_fops
= {
2800 .open
= sg_proc_open_devstrs
,
2801 .release
= seq_release
,
2803 static struct seq_operations devstrs_seq_ops
= {
2804 .start
= dev_seq_start
,
2805 .next
= dev_seq_next
,
2806 .stop
= dev_seq_stop
,
2807 .show
= sg_proc_seq_show_devstrs
,
2810 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
);
2811 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
);
2812 static struct file_operations debug_fops
= {
2813 .open
= sg_proc_open_debug
,
2814 .release
= seq_release
,
2816 static struct seq_operations debug_seq_ops
= {
2817 .start
= dev_seq_start
,
2818 .next
= dev_seq_next
,
2819 .stop
= dev_seq_stop
,
2820 .show
= sg_proc_seq_show_debug
,
2824 struct sg_proc_leaf
{
2826 struct file_operations
* fops
;
2829 static struct sg_proc_leaf sg_proc_leaf_arr
[] = {
2830 {"allow_dio", &adio_fops
},
2831 {"debug", &debug_fops
},
2832 {"def_reserved_size", &dressz_fops
},
2833 {"device_hdr", &devhdr_fops
},
2834 {"devices", &dev_fops
},
2835 {"device_strs", &devstrs_fops
},
2836 {"version", &version_fops
}
2844 sizeof (sg_proc_leaf_arr
) / sizeof (sg_proc_leaf_arr
[0]);
2845 struct proc_dir_entry
*pdep
;
2846 struct sg_proc_leaf
* leaf
;
2848 sg_proc_sgp
= proc_mkdir(sg_proc_sg_dirname
, NULL
);
2851 for (k
= 0; k
< num_leaves
; ++k
) {
2852 leaf
= &sg_proc_leaf_arr
[k
];
2853 mask
= leaf
->fops
->write
? S_IRUGO
| S_IWUSR
: S_IRUGO
;
2854 pdep
= create_proc_entry(leaf
->name
, mask
, sg_proc_sgp
);
2856 leaf
->fops
->owner
= THIS_MODULE
,
2857 leaf
->fops
->read
= seq_read
,
2858 leaf
->fops
->llseek
= seq_lseek
,
2859 pdep
->proc_fops
= leaf
->fops
;
2866 sg_proc_cleanup(void)
2870 sizeof (sg_proc_leaf_arr
) / sizeof (sg_proc_leaf_arr
[0]);
2874 for (k
= 0; k
< num_leaves
; ++k
)
2875 remove_proc_entry(sg_proc_leaf_arr
[k
].name
, sg_proc_sgp
);
2876 remove_proc_entry(sg_proc_sg_dirname
, NULL
);
2880 static int sg_proc_seq_show_int(struct seq_file
*s
, void *v
)
2882 seq_printf(s
, "%d\n", *((int *)s
->private));
2886 static int sg_proc_single_open_adio(struct inode
*inode
, struct file
*file
)
2888 return single_open(file
, sg_proc_seq_show_int
, &sg_allow_dio
);
2892 sg_proc_write_adio(struct file
*filp
, const char __user
*buffer
,
2893 size_t count
, loff_t
*off
)
2898 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2900 num
= (count
< 10) ? count
: 10;
2901 if (copy_from_user(buff
, buffer
, num
))
2904 sg_allow_dio
= simple_strtoul(buff
, NULL
, 10) ? 1 : 0;
2908 static int sg_proc_single_open_dressz(struct inode
*inode
, struct file
*file
)
2910 return single_open(file
, sg_proc_seq_show_int
, &sg_big_buff
);
2914 sg_proc_write_dressz(struct file
*filp
, const char __user
*buffer
,
2915 size_t count
, loff_t
*off
)
2918 unsigned long k
= ULONG_MAX
;
2921 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2923 num
= (count
< 10) ? count
: 10;
2924 if (copy_from_user(buff
, buffer
, num
))
2927 k
= simple_strtoul(buff
, NULL
, 10);
2928 if (k
<= 1048576) { /* limit "big buff" to 1 MB */
2935 static int sg_proc_seq_show_version(struct seq_file
*s
, void *v
)
2937 seq_printf(s
, "%d\t%s [%s]\n", sg_version_num
, SG_VERSION_STR
,
2942 static int sg_proc_single_open_version(struct inode
*inode
, struct file
*file
)
2944 return single_open(file
, sg_proc_seq_show_version
, NULL
);
2947 static int sg_proc_seq_show_devhdr(struct seq_file
*s
, void *v
)
2949 seq_printf(s
, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2954 static int sg_proc_single_open_devhdr(struct inode
*inode
, struct file
*file
)
2956 return single_open(file
, sg_proc_seq_show_devhdr
, NULL
);
2959 struct sg_proc_deviter
{
2964 static void * dev_seq_start(struct seq_file
*s
, loff_t
*pos
)
2966 struct sg_proc_deviter
* it
= kmalloc(sizeof(*it
), GFP_KERNEL
);
2972 if (NULL
== sg_dev_arr
)
2975 it
->max
= sg_last_dev();
2976 if (it
->index
>= it
->max
)
2981 static void * dev_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
2983 struct sg_proc_deviter
* it
= s
->private;
2986 return (it
->index
< it
->max
) ? it
: NULL
;
2989 static void dev_seq_stop(struct seq_file
*s
, void *v
)
2994 static int sg_proc_open_dev(struct inode
*inode
, struct file
*file
)
2996 return seq_open(file
, &dev_seq_ops
);
2999 static int sg_proc_seq_show_dev(struct seq_file
*s
, void *v
)
3001 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
3003 struct scsi_device
*scsidp
;
3005 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
3006 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
3007 seq_printf(s
, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
3008 scsidp
->host
->host_no
, scsidp
->channel
,
3009 scsidp
->id
, scsidp
->lun
, (int) scsidp
->type
,
3011 (int) scsidp
->queue_depth
,
3012 (int) scsidp
->device_busy
,
3013 (int) scsi_device_online(scsidp
));
3015 seq_printf(s
, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
3019 static int sg_proc_open_devstrs(struct inode
*inode
, struct file
*file
)
3021 return seq_open(file
, &devstrs_seq_ops
);
3024 static int sg_proc_seq_show_devstrs(struct seq_file
*s
, void *v
)
3026 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
3028 struct scsi_device
*scsidp
;
3030 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
3031 if (sdp
&& (scsidp
= sdp
->device
) && (!sdp
->detached
))
3032 seq_printf(s
, "%8.8s\t%16.16s\t%4.4s\n",
3033 scsidp
->vendor
, scsidp
->model
, scsidp
->rev
);
3035 seq_printf(s
, "<no active device>\n");
3039 static void sg_proc_debug_helper(struct seq_file
*s
, Sg_device
* sdp
)
3041 int k
, m
, new_interface
, blen
, usg
;
3044 const sg_io_hdr_t
*hp
;
3048 for (k
= 0; (fp
= sg_get_nth_sfp(sdp
, k
)); ++k
) {
3049 seq_printf(s
, " FD(%d): timeout=%dms bufflen=%d "
3050 "(res)sgat=%d low_dma=%d\n", k
+ 1,
3051 jiffies_to_msecs(fp
->timeout
),
3052 fp
->reserve
.bufflen
,
3053 (int) fp
->reserve
.k_use_sg
,
3055 seq_printf(s
, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
3056 (int) fp
->cmd_q
, (int) fp
->force_packid
,
3057 (int) fp
->keep_orphan
, (int) fp
->closed
);
3058 for (m
= 0; (srp
= sg_get_nth_request(fp
, m
)); ++m
) {
3060 new_interface
= (hp
->interface_id
== '\0') ? 0 : 1;
3061 if (srp
->res_used
) {
3062 if (new_interface
&&
3063 (SG_FLAG_MMAP_IO
& hp
->flags
))
3068 if (SG_INFO_DIRECT_IO_MASK
& hp
->info
)
3074 blen
= srp
->my_cmdp
?
3075 srp
->my_cmdp
->sr_bufflen
: srp
->data
.bufflen
;
3076 usg
= srp
->my_cmdp
?
3077 srp
->my_cmdp
->sr_use_sg
: srp
->data
.k_use_sg
;
3078 seq_printf(s
, srp
->done
?
3079 ((1 == srp
->done
) ? "rcv:" : "fin:")
3080 : (srp
->my_cmdp
? "act:" : "prior:"));
3081 seq_printf(s
, " id=%d blen=%d",
3082 srp
->header
.pack_id
, blen
);
3084 seq_printf(s
, " dur=%d", hp
->duration
);
3086 ms
= jiffies_to_msecs(jiffies
);
3087 seq_printf(s
, " t_o/elap=%d/%d",
3088 (new_interface
? hp
->timeout
:
3089 jiffies_to_msecs(fp
->timeout
)),
3090 (ms
> hp
->duration
? ms
- hp
->duration
: 0));
3092 seq_printf(s
, "ms sgat=%d op=0x%02x\n", usg
,
3093 (int) srp
->data
.cmd_opcode
);
3096 seq_printf(s
, " No requests active\n");
3100 static int sg_proc_open_debug(struct inode
*inode
, struct file
*file
)
3102 return seq_open(file
, &debug_seq_ops
);
3105 static int sg_proc_seq_show_debug(struct seq_file
*s
, void *v
)
3107 struct sg_proc_deviter
* it
= (struct sg_proc_deviter
*) v
;
3110 if (it
&& (0 == it
->index
)) {
3111 seq_printf(s
, "dev_max(currently)=%d max_active_device=%d "
3112 "(origin 1)\n", sg_dev_max
, (int)it
->max
);
3113 seq_printf(s
, " def_reserved_size=%d\n", sg_big_buff
);
3115 sdp
= it
? sg_get_dev(it
->index
) : NULL
;
3117 struct scsi_device
*scsidp
= sdp
->device
;
3119 if (NULL
== scsidp
) {
3120 seq_printf(s
, "device %d detached ??\n",
3125 if (sg_get_nth_sfp(sdp
, 0)) {
3126 seq_printf(s
, " >>> device=%s ",
3127 sdp
->disk
->disk_name
);
3129 seq_printf(s
, "detached pending close ");
3132 (s
, "scsi%d chan=%d id=%d lun=%d em=%d",
3133 scsidp
->host
->host_no
,
3134 scsidp
->channel
, scsidp
->id
,
3136 scsidp
->host
->hostt
->emulated
);
3137 seq_printf(s
, " sg_tablesize=%d excl=%d\n",
3138 sdp
->sg_tablesize
, sdp
->exclude
);
3140 sg_proc_debug_helper(s
, sdp
);
3145 #endif /* CONFIG_SCSI_PROC_FS */
3147 module_init(init_sg
);
3148 module_exit(exit_sg
);
3149 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR
);