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/blktrace_api.h>
51 #include <linux/smp_lock.h>
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_host.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_ioctl.h>
60 #include "scsi_logging.h"
62 #ifdef CONFIG_SCSI_PROC_FS
63 #include <linux/proc_fs.h>
64 static char *sg_version_date = "20061027";
66 static int sg_proc_init(void);
67 static void sg_proc_cleanup(void);
70 #define SG_ALLOW_DIO_DEF 0
72 #define SG_MAX_DEVS 32768
75 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
76 * Then when using 32 bit integers x * m may overflow during the calculation.
77 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
78 * calculates the same, but prevents the overflow when both m and d
79 * are "small" numbers (like HZ and USER_HZ).
80 * Of course an overflow is inavoidable if the result of muldiv doesn't fit
83 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
85 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
87 int sg_big_buff = SG_DEF_RESERVED_SIZE;
88 /* N.B. This variable is readable and writeable via
89 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
90 of this size (or less if there is not enough memory) will be reserved
91 for use by this file descriptor. [Deprecated usage: this variable is also
92 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
93 the kernel (i.e. it is not a module).] */
94 static int def_reserved_size = -1; /* picks up init parameter */
95 static int sg_allow_dio = SG_ALLOW_DIO_DEF;
97 static int scatter_elem_sz = SG_SCATTER_SZ;
98 static int scatter_elem_sz_prev = SG_SCATTER_SZ;
100 #define SG_SECTOR_SZ 512
101 #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
103 static int sg_add(struct device *, struct class_interface *);
104 static void sg_remove(struct device *, struct class_interface *);
106 static DEFINE_IDR(sg_index_idr);
107 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock
108 file descriptor list for device */
110 static struct class_interface sg_interface = {
112 .remove_dev = sg_remove,
115 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
116 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
117 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */
118 unsigned bufflen; /* Size of (aggregate) data buffer */
119 unsigned b_malloc_len; /* actual len malloc'ed in buffer */
122 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
123 unsigned char cmd_opcode; /* first byte of command */
126 struct sg_device; /* forward declarations */
129 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
130 struct sg_request *nextrp; /* NULL -> tail request (slist) */
131 struct sg_fd *parentfp; /* NULL -> not in use */
132 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
133 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
134 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
135 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
136 char orphan; /* 1 -> drop on sight, 0 -> normal */
137 char sg_io_owned; /* 1 -> packet belongs to SG_IO */
138 volatile char done; /* 0->before bh, 1->before read, 2->read */
143 typedef struct sg_fd { /* holds the state of a file descriptor */
144 struct sg_fd *nextfp; /* NULL when last opened fd on this device */
145 struct sg_device *parentdp; /* owning device */
146 wait_queue_head_t read_wait; /* queue read until command done */
147 rwlock_t rq_list_lock; /* protect access to list in req_arr */
148 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
149 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
150 Sg_scatter_hold reserve; /* buffer held for this file descriptor */
151 unsigned save_scat_len; /* original length of trunc. scat. element */
152 Sg_request *headrp; /* head of request slist, NULL->empty */
153 struct fasync_struct *async_qp; /* used by asynchronous notification */
154 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
155 char low_dma; /* as in parent but possibly overridden to 1 */
156 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
157 volatile char closed; /* 1 -> fd closed but request(s) outstanding */
158 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
159 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
160 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
161 char mmap_called; /* 0 -> mmap() never called on this fd */
164 typedef struct sg_device { /* holds the state of each scsi generic device */
165 struct scsi_device *device;
166 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
167 int sg_tablesize; /* adapter's max scatter-gather table size */
168 u32 index; /* device index number */
169 Sg_fd *headfp; /* first open fd belonging to this device */
170 volatile char detached; /* 0->attached, 1->detached pending removal */
171 volatile char exclude; /* opened for exclusive access */
172 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
173 struct gendisk *disk;
174 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
177 static int sg_fasync(int fd, struct file *filp, int mode);
178 /* tasklet or soft irq callback */
179 static void sg_rq_end_io(struct request *rq, int uptodate);
180 static int sg_start_req(Sg_request *srp, unsigned char *cmd);
181 static void sg_finish_rem_req(Sg_request * srp);
182 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
183 static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
185 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
187 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file,
188 const char __user *buf, size_t count, int blocking,
189 int read_only, Sg_request **o_srp);
190 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
191 unsigned char *cmnd, int timeout, int blocking);
192 static int sg_write_xfer(Sg_request * srp);
193 static int sg_read_xfer(Sg_request * srp);
194 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
195 static void sg_remove_scat(Sg_scatter_hold * schp);
196 static void sg_build_reserve(Sg_fd * sfp, int req_size);
197 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
198 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
199 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
200 static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
201 static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
202 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
203 static Sg_request *sg_add_request(Sg_fd * sfp);
204 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
205 static int sg_res_in_use(Sg_fd * sfp);
206 static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
207 static Sg_device *sg_get_dev(int dev);
208 #ifdef CONFIG_SCSI_PROC_FS
209 static int sg_last_dev(void);
212 #define SZ_SG_HEADER sizeof(struct sg_header)
213 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
214 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
215 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
217 static int sg_allow_access(struct file *filp, unsigned char *cmd)
219 struct sg_fd *sfp = (struct sg_fd *)filp->private_data;
220 struct request_queue *q = sfp->parentdp->device->request_queue;
222 if (sfp->parentdp->device->type == TYPE_SCANNER)
225 return blk_verify_command(&q->cmd_filter,
226 cmd, filp->f_mode & FMODE_WRITE);
230 sg_open(struct inode *inode, struct file *filp)
232 int dev = iminor(inode);
233 int flags = filp->f_flags;
234 struct request_queue *q;
241 nonseekable_open(inode, filp);
242 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
243 sdp = sg_get_dev(dev);
244 if ((!sdp) || (!sdp->device)) {
253 /* This driver's module count bumped by fops_get in <linux/fs.h> */
254 /* Prevent the device driver from vanishing while we sleep */
255 retval = scsi_device_get(sdp->device);
261 if (!((flags & O_NONBLOCK) ||
262 scsi_block_when_processing_errors(sdp->device))) {
264 /* we are in error recovery for this device */
268 if (flags & O_EXCL) {
269 if (O_RDONLY == (flags & O_ACCMODE)) {
270 retval = -EPERM; /* Can't lock it with read only access */
273 if (sdp->headfp && (flags & O_NONBLOCK)) {
278 __wait_event_interruptible(sdp->o_excl_wait,
279 ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
281 retval = res; /* -ERESTARTSYS because signal hit process */
284 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
285 if (flags & O_NONBLOCK) {
290 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
293 retval = res; /* -ERESTARTSYS because signal hit process */
301 if (!sdp->headfp) { /* no existing opens on this device */
303 q = sdp->device->request_queue;
304 sdp->sg_tablesize = min(q->max_hw_segments,
305 q->max_phys_segments);
307 if ((sfp = sg_add_sfp(sdp, dev)))
308 filp->private_data = sfp;
311 sdp->exclude = 0; /* undo if error */
319 scsi_device_put(sdp->device);
324 /* Following function was formerly called 'sg_close' */
326 sg_release(struct inode *inode, struct file *filp)
331 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
333 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
334 sg_fasync(-1, filp, 0); /* remove filp from async notification list */
335 if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
336 if (!sdp->detached) {
337 scsi_device_put(sdp->device);
340 wake_up_interruptible(&sdp->o_excl_wait);
346 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
351 int req_pack_id = -1;
353 struct sg_header *old_hdr = NULL;
356 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
358 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
359 sdp->disk->disk_name, (int) count));
361 if (!access_ok(VERIFY_WRITE, buf, count))
363 if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
364 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
367 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
371 if (old_hdr->reply_len < 0) {
372 if (count >= SZ_SG_IO_HDR) {
373 sg_io_hdr_t *new_hdr;
374 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
379 retval =__copy_from_user
380 (new_hdr, buf, SZ_SG_IO_HDR);
381 req_pack_id = new_hdr->pack_id;
389 req_pack_id = old_hdr->pack_id;
391 srp = sg_get_rq_mark(sfp, req_pack_id);
392 if (!srp) { /* now wait on packet to arrive */
397 if (filp->f_flags & O_NONBLOCK) {
402 retval = 0; /* following macro beats race condition */
403 __wait_event_interruptible(sfp->read_wait,
405 (srp = sg_get_rq_mark(sfp, req_pack_id))),
414 /* -ERESTARTSYS as signal hit process */
418 if (srp->header.interface_id != '\0') {
419 retval = sg_new_read(sfp, buf, count, srp);
424 if (old_hdr == NULL) {
425 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
431 memset(old_hdr, 0, SZ_SG_HEADER);
432 old_hdr->reply_len = (int) hp->timeout;
433 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
434 old_hdr->pack_id = hp->pack_id;
435 old_hdr->twelve_byte =
436 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
437 old_hdr->target_status = hp->masked_status;
438 old_hdr->host_status = hp->host_status;
439 old_hdr->driver_status = hp->driver_status;
440 if ((CHECK_CONDITION & hp->masked_status) ||
441 (DRIVER_SENSE & hp->driver_status))
442 memcpy(old_hdr->sense_buffer, srp->sense_b,
443 sizeof (old_hdr->sense_buffer));
444 switch (hp->host_status) {
445 /* This setup of 'result' is for backward compatibility and is best
446 ignored by the user who should use target, host + driver status */
448 case DID_PASSTHROUGH:
455 old_hdr->result = EBUSY;
462 old_hdr->result = EIO;
465 old_hdr->result = (srp->sense_b[0] == 0 &&
466 hp->masked_status == GOOD) ? 0 : EIO;
469 old_hdr->result = EIO;
473 /* Now copy the result back to the user buffer. */
474 if (count >= SZ_SG_HEADER) {
475 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
480 if (count > old_hdr->reply_len)
481 count = old_hdr->reply_len;
482 if (count > SZ_SG_HEADER) {
483 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
489 count = (old_hdr->result == 0) ? 0 : -EIO;
490 sg_finish_rem_req(srp);
498 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
500 sg_io_hdr_t *hp = &srp->header;
504 if (count < SZ_SG_IO_HDR) {
509 if ((hp->mx_sb_len > 0) && hp->sbp) {
510 if ((CHECK_CONDITION & hp->masked_status) ||
511 (DRIVER_SENSE & hp->driver_status)) {
512 int sb_len = SCSI_SENSE_BUFFERSIZE;
513 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
514 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
515 len = (len > sb_len) ? sb_len : len;
516 if (copy_to_user(hp->sbp, srp->sense_b, len)) {
523 if (hp->masked_status || hp->host_status || hp->driver_status)
524 hp->info |= SG_INFO_CHECK;
525 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
529 err = sg_read_xfer(srp);
531 sg_finish_rem_req(srp);
532 return (0 == err) ? count : err;
536 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
538 int mxsize, cmd_size, k;
539 int input_size, blocking;
540 unsigned char opcode;
544 struct sg_header old_hdr;
546 unsigned char cmnd[MAX_COMMAND_SIZE];
548 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
550 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
551 sdp->disk->disk_name, (int) count));
554 if (!((filp->f_flags & O_NONBLOCK) ||
555 scsi_block_when_processing_errors(sdp->device)))
558 if (!access_ok(VERIFY_READ, buf, count))
559 return -EFAULT; /* protects following copy_from_user()s + get_user()s */
560 if (count < SZ_SG_HEADER)
562 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
564 blocking = !(filp->f_flags & O_NONBLOCK);
565 if (old_hdr.reply_len < 0)
566 return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL);
567 if (count < (SZ_SG_HEADER + 6))
568 return -EIO; /* The minimum scsi command length is 6 bytes. */
570 if (!(srp = sg_add_request(sfp))) {
571 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
575 __get_user(opcode, buf);
576 if (sfp->next_cmd_len > 0) {
577 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
578 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
579 sfp->next_cmd_len = 0;
580 sg_remove_request(sfp, srp);
583 cmd_size = sfp->next_cmd_len;
584 sfp->next_cmd_len = 0; /* reset so only this write() effected */
586 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
587 if ((opcode >= 0xc0) && old_hdr.twelve_byte)
590 SCSI_LOG_TIMEOUT(4, printk(
591 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
592 /* Determine buffer size. */
593 input_size = count - cmd_size;
594 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
595 mxsize -= SZ_SG_HEADER;
596 input_size -= SZ_SG_HEADER;
597 if (input_size < 0) {
598 sg_remove_request(sfp, srp);
599 return -EIO; /* User did not pass enough bytes for this command. */
602 hp->interface_id = '\0'; /* indicator of old interface tunnelled */
603 hp->cmd_len = (unsigned char) cmd_size;
607 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
608 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
610 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
611 hp->dxfer_len = mxsize;
612 if (hp->dxfer_direction == SG_DXFER_TO_DEV)
613 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 k = sg_start_req(srp, cmnd);
737 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
738 sg_finish_rem_req(srp);
739 return k; /* probably out of space --> ENOMEM */
741 if ((k = sg_write_xfer(srp))) {
742 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
743 sg_finish_rem_req(srp);
747 sg_finish_rem_req(srp);
751 switch (hp->dxfer_direction) {
752 case SG_DXFER_TO_FROM_DEV:
753 case SG_DXFER_FROM_DEV:
754 data_dir = DMA_FROM_DEVICE;
756 case SG_DXFER_TO_DEV:
757 data_dir = DMA_TO_DEVICE;
759 case SG_DXFER_UNKNOWN:
760 data_dir = DMA_BIDIRECTIONAL;
766 hp->duration = jiffies_to_msecs(jiffies);
768 srp->rq->timeout = timeout;
769 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk,
770 srp->rq, 1, sg_rq_end_io);
775 sg_srp_done(Sg_request *srp, Sg_fd *sfp)
777 unsigned long iflags;
780 read_lock_irqsave(&sfp->rq_list_lock, iflags);
782 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
787 sg_ioctl(struct inode *inode, struct file *filp,
788 unsigned int cmd_in, unsigned long arg)
790 void __user *p = (void __user *)arg;
792 int result, val, read_only;
796 unsigned long iflags;
798 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
801 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
802 sdp->disk->disk_name, (int) cmd_in));
803 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
808 int blocking = 1; /* ignore O_NONBLOCK flag */
812 if (!scsi_block_when_processing_errors(sdp->device))
814 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
817 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR,
818 blocking, read_only, &srp);
821 srp->sg_io_owned = 1;
823 result = 0; /* following macro to beat race condition */
824 __wait_event_interruptible(sfp->read_wait,
825 (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
830 return 0; /* request packet dropped already */
834 return result; /* -ERESTARTSYS because signal hit process */
836 write_lock_irqsave(&sfp->rq_list_lock, iflags);
838 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
839 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
840 return (result < 0) ? result : 0;
843 result = get_user(val, ip);
848 if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
849 val = MULDIV (INT_MAX, USER_HZ, HZ);
850 sfp->timeout_user = val;
851 sfp->timeout = MULDIV (val, HZ, USER_HZ);
854 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
855 /* strange ..., for backward compatibility */
856 return sfp->timeout_user;
857 case SG_SET_FORCE_LOW_DMA:
858 result = get_user(val, ip);
863 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
864 val = (int) sfp->reserve.bufflen;
865 sg_remove_scat(&sfp->reserve);
866 sg_build_reserve(sfp, val);
871 sfp->low_dma = sdp->device->host->unchecked_isa_dma;
875 return put_user((int) sfp->low_dma, ip);
877 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
880 sg_scsi_id_t __user *sg_idp = p;
884 __put_user((int) sdp->device->host->host_no,
886 __put_user((int) sdp->device->channel,
888 __put_user((int) sdp->device->id, &sg_idp->scsi_id);
889 __put_user((int) sdp->device->lun, &sg_idp->lun);
890 __put_user((int) sdp->device->type, &sg_idp->scsi_type);
891 __put_user((short) sdp->device->host->cmd_per_lun,
892 &sg_idp->h_cmd_per_lun);
893 __put_user((short) sdp->device->queue_depth,
894 &sg_idp->d_queue_depth);
895 __put_user(0, &sg_idp->unused[0]);
896 __put_user(0, &sg_idp->unused[1]);
899 case SG_SET_FORCE_PACK_ID:
900 result = get_user(val, ip);
903 sfp->force_packid = val ? 1 : 0;
906 if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
908 read_lock_irqsave(&sfp->rq_list_lock, iflags);
909 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
910 if ((1 == srp->done) && (!srp->sg_io_owned)) {
911 read_unlock_irqrestore(&sfp->rq_list_lock,
913 __put_user(srp->header.pack_id, ip);
917 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
920 case SG_GET_NUM_WAITING:
921 read_lock_irqsave(&sfp->rq_list_lock, iflags);
922 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
923 if ((1 == srp->done) && (!srp->sg_io_owned))
926 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
927 return put_user(val, ip);
928 case SG_GET_SG_TABLESIZE:
929 return put_user(sdp->sg_tablesize, ip);
930 case SG_SET_RESERVED_SIZE:
931 result = get_user(val, ip);
936 val = min_t(int, val,
937 sdp->device->request_queue->max_sectors * 512);
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 = min_t(int, sfp->reserve.bufflen,
947 sdp->device->request_queue->max_sectors * 512);
948 return put_user(val, ip);
949 case SG_SET_COMMAND_Q:
950 result = get_user(val, ip);
953 sfp->cmd_q = val ? 1 : 0;
955 case SG_GET_COMMAND_Q:
956 return put_user((int) sfp->cmd_q, ip);
957 case SG_SET_KEEP_ORPHAN:
958 result = get_user(val, ip);
961 sfp->keep_orphan = val;
963 case SG_GET_KEEP_ORPHAN:
964 return put_user((int) sfp->keep_orphan, ip);
965 case SG_NEXT_CMD_LEN:
966 result = get_user(val, ip);
969 sfp->next_cmd_len = (val > 0) ? val : 0;
971 case SG_GET_VERSION_NUM:
972 return put_user(sg_version_num, ip);
973 case SG_GET_ACCESS_COUNT:
974 /* faked - we don't have a real access count anymore */
975 val = (sdp->device ? 1 : 0);
976 return put_user(val, ip);
977 case SG_GET_REQUEST_TABLE:
978 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
981 sg_req_info_t *rinfo;
984 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
988 read_lock_irqsave(&sfp->rq_list_lock, iflags);
989 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
990 ++val, srp = srp ? srp->nextrp : srp) {
991 memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
993 rinfo[val].req_state = srp->done + 1;
995 srp->header.masked_status &
996 srp->header.host_status &
997 srp->header.driver_status;
999 rinfo[val].duration =
1000 srp->header.duration;
1002 ms = jiffies_to_msecs(jiffies);
1003 rinfo[val].duration =
1004 (ms > srp->header.duration) ?
1005 (ms - srp->header.duration) : 0;
1007 rinfo[val].orphan = srp->orphan;
1008 rinfo[val].sg_io_owned =
1010 rinfo[val].pack_id =
1011 srp->header.pack_id;
1012 rinfo[val].usr_ptr =
1013 srp->header.usr_ptr;
1016 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1017 result = __copy_to_user(p, rinfo,
1018 SZ_SG_REQ_INFO * SG_MAX_QUEUE);
1019 result = result ? -EFAULT : 0;
1023 case SG_EMULATED_HOST:
1026 return put_user(sdp->device->host->hostt->emulated, ip);
1030 if (filp->f_flags & O_NONBLOCK) {
1031 if (scsi_host_in_recovery(sdp->device->host))
1033 } else if (!scsi_block_when_processing_errors(sdp->device))
1035 result = get_user(val, ip);
1038 if (SG_SCSI_RESET_NOTHING == val)
1041 case SG_SCSI_RESET_DEVICE:
1042 val = SCSI_TRY_RESET_DEVICE;
1044 case SG_SCSI_RESET_TARGET:
1045 val = SCSI_TRY_RESET_TARGET;
1047 case SG_SCSI_RESET_BUS:
1048 val = SCSI_TRY_RESET_BUS;
1050 case SG_SCSI_RESET_HOST:
1051 val = SCSI_TRY_RESET_HOST;
1056 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1058 return (scsi_reset_provider(sdp->device, val) ==
1059 SUCCESS) ? 0 : -EIO;
1060 case SCSI_IOCTL_SEND_COMMAND:
1064 unsigned char opcode = WRITE_6;
1065 Scsi_Ioctl_Command __user *siocp = p;
1067 if (copy_from_user(&opcode, siocp->data, 1))
1069 if (sg_allow_access(filp, &opcode))
1072 return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
1074 result = get_user(val, ip);
1077 sdp->sgdebug = (char) val;
1079 case SCSI_IOCTL_GET_IDLUN:
1080 case SCSI_IOCTL_GET_BUS_NUMBER:
1081 case SCSI_IOCTL_PROBE_HOST:
1082 case SG_GET_TRANSFORM:
1085 return scsi_ioctl(sdp->device, cmd_in, p);
1087 return put_user(sdp->device->request_queue->max_sectors * 512,
1090 return blk_trace_setup(sdp->device->request_queue,
1091 sdp->disk->disk_name,
1092 sdp->device->sdev_gendev.devt,
1095 return blk_trace_startstop(sdp->device->request_queue, 1);
1097 return blk_trace_startstop(sdp->device->request_queue, 0);
1098 case BLKTRACETEARDOWN:
1099 return blk_trace_remove(sdp->device->request_queue);
1102 return -EPERM; /* don't know so take safe approach */
1103 return scsi_ioctl(sdp->device, cmd_in, p);
1107 #ifdef CONFIG_COMPAT
1108 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
1112 struct scsi_device *sdev;
1114 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1118 if (sdev->host->hostt->compat_ioctl) {
1121 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
1126 return -ENOIOCTLCMD;
1131 sg_poll(struct file *filp, poll_table * wait)
1133 unsigned int res = 0;
1138 unsigned long iflags;
1140 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
1143 poll_wait(filp, &sfp->read_wait, wait);
1144 read_lock_irqsave(&sfp->rq_list_lock, iflags);
1145 for (srp = sfp->headrp; srp; srp = srp->nextrp) {
1146 /* if any read waiting, flag it */
1147 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
1148 res = POLLIN | POLLRDNORM;
1151 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1155 else if (!sfp->cmd_q) {
1157 res |= POLLOUT | POLLWRNORM;
1158 } else if (count < SG_MAX_QUEUE)
1159 res |= POLLOUT | POLLWRNORM;
1160 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
1161 sdp->disk->disk_name, (int) res));
1166 sg_fasync(int fd, struct file *filp, int mode)
1172 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
1174 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
1175 sdp->disk->disk_name, mode));
1177 retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
1178 return (retval < 0) ? retval : 0;
1182 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1185 unsigned long offset, len, sa;
1186 Sg_scatter_hold *rsv_schp;
1189 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
1190 return VM_FAULT_SIGBUS;
1191 rsv_schp = &sfp->reserve;
1192 offset = vmf->pgoff << PAGE_SHIFT;
1193 if (offset >= rsv_schp->bufflen)
1194 return VM_FAULT_SIGBUS;
1195 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
1196 offset, rsv_schp->k_use_sg));
1198 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1199 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1200 len = vma->vm_end - sa;
1201 len = (len < length) ? len : length;
1203 struct page *page = nth_page(rsv_schp->pages[k],
1204 offset >> PAGE_SHIFT);
1205 get_page(page); /* increment page count */
1207 return 0; /* success */
1213 return VM_FAULT_SIGBUS;
1216 static struct vm_operations_struct sg_mmap_vm_ops = {
1217 .fault = sg_vma_fault,
1221 sg_mmap(struct file *filp, struct vm_area_struct *vma)
1224 unsigned long req_sz, len, sa;
1225 Sg_scatter_hold *rsv_schp;
1228 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
1230 req_sz = vma->vm_end - vma->vm_start;
1231 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
1232 (void *) vma->vm_start, (int) req_sz));
1234 return -EINVAL; /* want no offset */
1235 rsv_schp = &sfp->reserve;
1236 if (req_sz > rsv_schp->bufflen)
1237 return -ENOMEM; /* cannot map more than reserved buffer */
1240 length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1241 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
1242 len = vma->vm_end - sa;
1243 len = (len < length) ? len : length;
1247 sfp->mmap_called = 1;
1248 vma->vm_flags |= VM_RESERVED;
1249 vma->vm_private_data = sfp;
1250 vma->vm_ops = &sg_mmap_vm_ops;
1255 * This function is a "bottom half" handler that is called by the mid
1256 * level when a command is completed (or has failed).
1258 static void sg_rq_end_io(struct request *rq, int uptodate)
1260 struct sg_request *srp = rq->end_io_data;
1261 Sg_device *sdp = NULL;
1263 unsigned long iflags;
1269 printk(KERN_ERR "sg_cmd_done: NULL request\n");
1272 sfp = srp->parentfp;
1274 sdp = sfp->parentdp;
1275 if ((NULL == sdp) || sdp->detached) {
1276 printk(KERN_INFO "sg_cmd_done: device detached\n");
1281 result = rq->errors;
1282 resid = rq->data_len;
1284 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
1285 sdp->disk->disk_name, srp->header.pack_id, result));
1286 srp->header.resid = resid;
1287 ms = jiffies_to_msecs(jiffies);
1288 srp->header.duration = (ms > srp->header.duration) ?
1289 (ms - srp->header.duration) : 0;
1291 struct scsi_sense_hdr sshdr;
1293 srp->header.status = 0xff & result;
1294 srp->header.masked_status = status_byte(result);
1295 srp->header.msg_status = msg_byte(result);
1296 srp->header.host_status = host_byte(result);
1297 srp->header.driver_status = driver_byte(result);
1298 if ((sdp->sgdebug > 0) &&
1299 ((CHECK_CONDITION == srp->header.masked_status) ||
1300 (COMMAND_TERMINATED == srp->header.masked_status)))
1301 __scsi_print_sense("sg_cmd_done", sense,
1302 SCSI_SENSE_BUFFERSIZE);
1304 /* Following if statement is a patch supplied by Eric Youngdale */
1305 if (driver_byte(result) != 0
1306 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
1307 && !scsi_sense_is_deferred(&sshdr)
1308 && sshdr.sense_key == UNIT_ATTENTION
1309 && sdp->device->removable) {
1310 /* Detected possible disc change. Set the bit - this */
1311 /* may be used if there are filesystems using this device */
1312 sdp->device->changed = 1;
1315 /* Rely on write phase to clean out srp status values, so no "else" */
1317 if (sfp->closed) { /* whoops this fd already released, cleanup */
1318 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
1319 sg_finish_rem_req(srp);
1321 if (NULL == sfp->headrp) {
1322 SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
1323 if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
1324 scsi_device_put(sdp->device);
1328 } else if (srp && srp->orphan) {
1329 if (sfp->keep_orphan)
1330 srp->sg_io_owned = 0;
1332 sg_finish_rem_req(srp);
1337 /* Now wake up any sg_read() that is waiting for this packet. */
1338 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
1339 write_lock_irqsave(&sfp->rq_list_lock, iflags);
1341 wake_up_interruptible(&sfp->read_wait);
1342 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
1346 static struct file_operations sg_fops = {
1347 .owner = THIS_MODULE,
1352 #ifdef CONFIG_COMPAT
1353 .compat_ioctl = sg_compat_ioctl,
1357 .release = sg_release,
1358 .fasync = sg_fasync,
1361 static struct class *sg_sysfs_class;
1363 static int sg_sysfs_valid = 0;
1365 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
1367 struct request_queue *q = scsidp->request_queue;
1369 unsigned long iflags;
1373 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
1375 printk(KERN_WARNING "kmalloc Sg_device failure\n");
1376 return ERR_PTR(-ENOMEM);
1379 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
1380 printk(KERN_WARNING "idr expansion Sg_device failure\n");
1384 write_lock_irqsave(&sg_index_lock, iflags);
1385 error = idr_get_new(&sg_index_idr, sdp, &k);
1386 write_unlock_irqrestore(&sg_index_lock, iflags);
1389 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
1394 if (unlikely(k >= SG_MAX_DEVS))
1397 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
1398 sprintf(disk->disk_name, "sg%d", k);
1399 disk->first_minor = k;
1401 sdp->device = scsidp;
1402 init_waitqueue_head(&sdp->o_excl_wait);
1403 sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
1410 return ERR_PTR(error);
1415 sdev_printk(KERN_WARNING, scsidp,
1416 "Unable to attach sg device type=%d, minor "
1417 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
1423 sg_add(struct device *cl_dev, struct class_interface *cl_intf)
1425 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1426 struct gendisk *disk;
1427 Sg_device *sdp = NULL;
1428 struct cdev * cdev = NULL;
1430 unsigned long iflags;
1432 disk = alloc_disk(1);
1434 printk(KERN_WARNING "alloc_disk failed\n");
1437 disk->major = SCSI_GENERIC_MAJOR;
1440 cdev = cdev_alloc();
1442 printk(KERN_WARNING "cdev_alloc failed\n");
1445 cdev->owner = THIS_MODULE;
1446 cdev->ops = &sg_fops;
1448 sdp = sg_alloc(disk, scsidp);
1450 printk(KERN_WARNING "sg_alloc failed\n");
1451 error = PTR_ERR(sdp);
1455 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1);
1460 if (sg_sysfs_valid) {
1461 struct device *sg_class_member;
1463 sg_class_member = device_create_drvdata(sg_sysfs_class,
1465 MKDEV(SCSI_GENERIC_MAJOR,
1468 "%s", disk->disk_name);
1469 if (IS_ERR(sg_class_member)) {
1470 printk(KERN_ERR "sg_add: "
1471 "device_create failed\n");
1472 error = PTR_ERR(sg_class_member);
1475 error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
1476 &sg_class_member->kobj, "generic");
1478 printk(KERN_ERR "sg_add: unable to make symlink "
1479 "'generic' back to sg%d\n", sdp->index);
1481 printk(KERN_WARNING "sg_add: sg_sys Invalid\n");
1483 sdev_printk(KERN_NOTICE, scsidp,
1484 "Attached scsi generic sg%d type %d\n", sdp->index,
1487 dev_set_drvdata(cl_dev, sdp);
1492 write_lock_irqsave(&sg_index_lock, iflags);
1493 idr_remove(&sg_index_idr, sdp->index);
1494 write_unlock_irqrestore(&sg_index_lock, iflags);
1505 sg_remove(struct device *cl_dev, struct class_interface *cl_intf)
1507 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent);
1508 Sg_device *sdp = dev_get_drvdata(cl_dev);
1509 unsigned long iflags;
1520 write_lock_irqsave(&sg_index_lock, iflags);
1523 for (sfp = sdp->headfp; sfp; sfp = tsfp) {
1525 for (srp = sfp->headrp; srp; srp = tsrp) {
1527 if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
1528 sg_finish_rem_req(srp);
1531 scsi_device_put(sdp->device);
1532 __sg_remove_sfp(sdp, sfp);
1535 wake_up_interruptible(&sfp->read_wait);
1536 kill_fasync(&sfp->async_qp, SIGPOLL,
1540 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index));
1541 if (NULL == sdp->headfp) {
1542 idr_remove(&sg_index_idr, sdp->index);
1544 } else { /* nothing active, simple case */
1545 SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index));
1546 idr_remove(&sg_index_idr, sdp->index);
1548 write_unlock_irqrestore(&sg_index_lock, iflags);
1550 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
1551 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index));
1552 cdev_del(sdp->cdev);
1554 put_disk(sdp->disk);
1556 if (NULL == sdp->headfp)
1560 msleep(10); /* dirty detach so delay device destruction */
1563 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
1564 module_param_named(def_reserved_size, def_reserved_size, int,
1566 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
1568 MODULE_AUTHOR("Douglas Gilbert");
1569 MODULE_DESCRIPTION("SCSI generic (sg) driver");
1570 MODULE_LICENSE("GPL");
1571 MODULE_VERSION(SG_VERSION_STR);
1572 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
1574 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
1575 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
1576 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
1577 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
1584 if (scatter_elem_sz < PAGE_SIZE) {
1585 scatter_elem_sz = PAGE_SIZE;
1586 scatter_elem_sz_prev = scatter_elem_sz;
1588 if (def_reserved_size >= 0)
1589 sg_big_buff = def_reserved_size;
1591 def_reserved_size = sg_big_buff;
1593 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1597 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
1598 if ( IS_ERR(sg_sysfs_class) ) {
1599 rc = PTR_ERR(sg_sysfs_class);
1603 rc = scsi_register_interface(&sg_interface);
1605 #ifdef CONFIG_SCSI_PROC_FS
1607 #endif /* CONFIG_SCSI_PROC_FS */
1610 class_destroy(sg_sysfs_class);
1612 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
1619 #ifdef CONFIG_SCSI_PROC_FS
1621 #endif /* CONFIG_SCSI_PROC_FS */
1622 scsi_unregister_interface(&sg_interface);
1623 class_destroy(sg_sysfs_class);
1625 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
1627 idr_destroy(&sg_index_idr);
1630 static int __sg_start_req(struct sg_request *srp, struct sg_io_hdr *hp,
1633 struct sg_fd *sfp = srp->parentfp;
1634 struct request_queue *q = sfp->parentdp->device->request_queue;
1636 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
1638 rq = blk_get_request(q, rw, GFP_ATOMIC);
1642 memcpy(rq->cmd, cmd, hp->cmd_len);
1644 rq->cmd_len = hp->cmd_len;
1645 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1648 rq->end_io_data = srp;
1649 rq->sense = srp->sense_b;
1650 rq->retries = SG_DEFAULT_RETRIES;
1655 static int sg_start_req(Sg_request *srp, unsigned char *cmd)
1658 Sg_fd *sfp = srp->parentfp;
1659 sg_io_hdr_t *hp = &srp->header;
1660 int dxfer_len = (int) hp->dxfer_len;
1661 int dxfer_dir = hp->dxfer_direction;
1662 Sg_scatter_hold *req_schp = &srp->data;
1663 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1664 struct request_queue *q = sfp->parentdp->device->request_queue;
1665 struct rq_map_data map_data;
1667 SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
1669 res = __sg_start_req(srp, hp, cmd);
1673 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
1676 if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
1677 (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
1678 (!sfp->parentdp->device->host->unchecked_isa_dma) &&
1679 blk_rq_aligned(q, hp->dxferp, dxfer_len))
1680 return sg_build_direct(srp, sfp, dxfer_len);
1682 if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
1683 sg_link_reserve(sfp, srp, dxfer_len);
1685 res = sg_build_indirect(req_schp, sfp, dxfer_len);
1688 struct request *rq = srp->rq;
1689 Sg_scatter_hold *schp = &srp->data;
1690 int iovec_count = (int) hp->iovec_count;
1692 map_data.pages = schp->pages;
1693 map_data.page_order = schp->page_order;
1694 map_data.nr_entries = schp->k_use_sg;
1697 res = blk_rq_map_user_iov(q, rq, &map_data, hp->dxferp,
1699 hp->dxfer_len, GFP_ATOMIC);
1701 res = blk_rq_map_user(q, rq, &map_data, hp->dxferp,
1702 hp->dxfer_len, GFP_ATOMIC);
1712 sg_finish_rem_req(Sg_request * srp)
1714 Sg_fd *sfp = srp->parentfp;
1715 Sg_scatter_hold *req_schp = &srp->data;
1717 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
1719 sg_unlink_reserve(sfp, srp);
1721 sg_remove_scat(req_schp);
1725 blk_rq_unmap_user(srp->bio);
1727 blk_put_request(srp->rq);
1730 sg_remove_request(sfp, srp);
1734 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
1736 int sg_bufflen = tablesize * sizeof(struct page *);
1737 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
1739 schp->pages = kzalloc(sg_bufflen, gfp_flags);
1742 schp->sglist_len = sg_bufflen;
1743 return tablesize; /* number of scat_gath elements allocated */
1746 /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
1748 sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
1750 sg_io_hdr_t *hp = &srp->header;
1751 Sg_scatter_hold *schp = &srp->data;
1753 struct request *rq = srp->rq;
1754 struct request_queue *q = sfp->parentdp->device->request_queue;
1756 res = blk_rq_map_user(q, rq, NULL, hp->dxferp, dxfer_len, GFP_ATOMIC);
1760 schp->dio_in_use = 1;
1761 hp->info |= SG_INFO_DIRECT_IO;
1766 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
1768 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems;
1769 int sg_tablesize = sfp->parentdp->sg_tablesize;
1770 int blk_size = buff_size, order;
1771 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
1776 ++blk_size; /* don't know why */
1777 /* round request up to next highest SG_SECTOR_SZ byte boundary */
1778 blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
1779 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
1780 buff_size, blk_size));
1782 /* N.B. ret_sz carried into this block ... */
1783 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
1784 if (mx_sc_elems < 0)
1785 return mx_sc_elems; /* most likely -ENOMEM */
1787 num = scatter_elem_sz;
1788 if (unlikely(num != scatter_elem_sz_prev)) {
1789 if (num < PAGE_SIZE) {
1790 scatter_elem_sz = PAGE_SIZE;
1791 scatter_elem_sz_prev = PAGE_SIZE;
1793 scatter_elem_sz_prev = num;
1797 gfp_mask |= GFP_DMA;
1799 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1800 gfp_mask |= __GFP_ZERO;
1802 order = get_order(num);
1804 ret_sz = 1 << (PAGE_SHIFT + order);
1806 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems;
1807 k++, rem_sz -= ret_sz) {
1809 num = (rem_sz > scatter_elem_sz_prev) ?
1810 scatter_elem_sz_prev : rem_sz;
1812 schp->pages[k] = alloc_pages(gfp_mask, order);
1813 if (!schp->pages[k])
1816 if (num == scatter_elem_sz_prev) {
1817 if (unlikely(ret_sz > scatter_elem_sz_prev)) {
1818 scatter_elem_sz = ret_sz;
1819 scatter_elem_sz_prev = ret_sz;
1823 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
1824 "ret_sz=%d\n", k, num, ret_sz));
1825 } /* end of for loop */
1827 schp->page_order = order;
1829 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
1830 "rem_sz=%d\n", k, rem_sz));
1832 schp->bufflen = blk_size;
1833 if (rem_sz > 0) /* must have failed */
1837 for (i = 0; i < k; i++)
1838 __free_pages(schp->pages[k], order);
1847 sg_write_xfer(Sg_request * srp)
1849 sg_io_hdr_t *hp = &srp->header;
1850 Sg_scatter_hold *schp = &srp->data;
1852 int dxfer_dir = hp->dxfer_direction;
1853 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1855 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
1856 (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1857 num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
1858 if (schp->bufflen < num_xfer)
1859 num_xfer = schp->bufflen;
1861 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1863 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1866 SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, k_use_sg=%d\n",
1867 num_xfer, schp->k_use_sg));
1873 sg_remove_scat(Sg_scatter_hold * schp)
1875 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
1876 if (schp->pages && schp->sglist_len > 0) {
1877 if (!schp->dio_in_use) {
1880 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1881 SCSI_LOG_TIMEOUT(5, printk(
1882 "sg_remove_scat: k=%d, pg=0x%p\n",
1883 k, schp->pages[k]));
1884 __free_pages(schp->pages[k], schp->page_order);
1890 memset(schp, 0, sizeof (*schp));
1894 sg_read_xfer(Sg_request * srp)
1896 sg_io_hdr_t *hp = &srp->header;
1897 Sg_scatter_hold *schp = &srp->data;
1899 int dxfer_dir = hp->dxfer_direction;
1900 int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
1902 if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
1903 || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
1904 num_xfer = hp->dxfer_len;
1905 if (schp->bufflen < num_xfer)
1906 num_xfer = schp->bufflen;
1908 if ((num_xfer <= 0) || (schp->dio_in_use) ||
1910 && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
1913 SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
1914 num_xfer, (int)hp->iovec_count, schp->k_use_sg));
1919 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
1921 Sg_scatter_hold *schp = &srp->data;
1924 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
1926 if ((!outp) || (num_read_xfer <= 0))
1929 blk_rq_unmap_user(srp->bio);
1932 num = 1 << (PAGE_SHIFT + schp->page_order);
1933 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
1934 if (num > num_read_xfer) {
1935 if (__copy_to_user(outp, page_address(schp->pages[k]),
1940 if (__copy_to_user(outp, page_address(schp->pages[k]),
1943 num_read_xfer -= num;
1944 if (num_read_xfer <= 0)
1954 sg_build_reserve(Sg_fd * sfp, int req_size)
1956 Sg_scatter_hold *schp = &sfp->reserve;
1958 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
1960 if (req_size < PAGE_SIZE)
1961 req_size = PAGE_SIZE;
1962 if (0 == sg_build_indirect(schp, sfp, req_size))
1965 sg_remove_scat(schp);
1966 req_size >>= 1; /* divide by 2 */
1967 } while (req_size > (PAGE_SIZE / 2));
1971 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
1973 Sg_scatter_hold *req_schp = &srp->data;
1974 Sg_scatter_hold *rsv_schp = &sfp->reserve;
1978 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
1981 num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
1982 for (k = 0; k < rsv_schp->k_use_sg; k++) {
1984 req_schp->k_use_sg = k + 1;
1985 req_schp->sglist_len = rsv_schp->sglist_len;
1986 req_schp->pages = rsv_schp->pages;
1988 req_schp->bufflen = size;
1989 req_schp->b_malloc_len = rsv_schp->b_malloc_len;
1990 req_schp->page_order = rsv_schp->page_order;
1996 if (k >= rsv_schp->k_use_sg)
1997 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
2001 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
2003 Sg_scatter_hold *req_schp = &srp->data;
2005 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
2006 (int) req_schp->k_use_sg));
2007 req_schp->k_use_sg = 0;
2008 req_schp->bufflen = 0;
2009 req_schp->pages = NULL;
2010 req_schp->page_order = 0;
2011 req_schp->sglist_len = 0;
2012 sfp->save_scat_len = 0;
2017 sg_get_rq_mark(Sg_fd * sfp, int pack_id)
2020 unsigned long iflags;
2022 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2023 for (resp = sfp->headrp; resp; resp = resp->nextrp) {
2024 /* look for requests that are ready + not SG_IO owned */
2025 if ((1 == resp->done) && (!resp->sg_io_owned) &&
2026 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
2027 resp->done = 2; /* guard against other readers */
2031 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2035 #ifdef CONFIG_SCSI_PROC_FS
2037 sg_get_nth_request(Sg_fd * sfp, int nth)
2040 unsigned long iflags;
2043 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2044 for (k = 0, resp = sfp->headrp; resp && (k < nth);
2045 ++k, resp = resp->nextrp) ;
2046 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2051 /* always adds to end of list */
2053 sg_add_request(Sg_fd * sfp)
2056 unsigned long iflags;
2058 Sg_request *rp = sfp->req_arr;
2060 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2063 memset(rp, 0, sizeof (Sg_request));
2068 if (0 == sfp->cmd_q)
2069 resp = NULL; /* command queuing disallowed */
2071 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
2075 if (k < SG_MAX_QUEUE) {
2076 memset(rp, 0, sizeof (Sg_request));
2078 while (resp->nextrp)
2079 resp = resp->nextrp;
2087 resp->nextrp = NULL;
2088 resp->header.duration = jiffies_to_msecs(jiffies);
2090 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2094 /* Return of 1 for found; 0 for not found */
2096 sg_remove_request(Sg_fd * sfp, Sg_request * srp)
2098 Sg_request *prev_rp;
2100 unsigned long iflags;
2103 if ((!sfp) || (!srp) || (!sfp->headrp))
2105 write_lock_irqsave(&sfp->rq_list_lock, iflags);
2106 prev_rp = sfp->headrp;
2107 if (srp == prev_rp) {
2108 sfp->headrp = prev_rp->nextrp;
2109 prev_rp->parentfp = NULL;
2112 while ((rp = prev_rp->nextrp)) {
2114 prev_rp->nextrp = rp->nextrp;
2115 rp->parentfp = NULL;
2122 write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2126 #ifdef CONFIG_SCSI_PROC_FS
2128 sg_get_nth_sfp(Sg_device * sdp, int nth)
2131 unsigned long iflags;
2134 read_lock_irqsave(&sg_index_lock, iflags);
2135 for (k = 0, resp = sdp->headfp; resp && (k < nth);
2136 ++k, resp = resp->nextfp) ;
2137 read_unlock_irqrestore(&sg_index_lock, iflags);
2143 sg_add_sfp(Sg_device * sdp, int dev)
2146 unsigned long iflags;
2149 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
2153 init_waitqueue_head(&sfp->read_wait);
2154 rwlock_init(&sfp->rq_list_lock);
2156 sfp->timeout = SG_DEFAULT_TIMEOUT;
2157 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
2158 sfp->force_packid = SG_DEF_FORCE_PACK_ID;
2159 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
2160 sdp->device->host->unchecked_isa_dma : 1;
2161 sfp->cmd_q = SG_DEF_COMMAND_Q;
2162 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
2163 sfp->parentdp = sdp;
2164 write_lock_irqsave(&sg_index_lock, iflags);
2167 else { /* add to tail of existing list */
2168 Sg_fd *pfp = sdp->headfp;
2173 write_unlock_irqrestore(&sg_index_lock, iflags);
2174 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
2175 if (unlikely(sg_big_buff != def_reserved_size))
2176 sg_big_buff = def_reserved_size;
2178 bufflen = min_t(int, sg_big_buff,
2179 sdp->device->request_queue->max_sectors * 512);
2180 sg_build_reserve(sfp, bufflen);
2181 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
2182 sfp->reserve.bufflen, sfp->reserve.k_use_sg));
2187 __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2192 prev_fp = sdp->headfp;
2194 sdp->headfp = prev_fp->nextfp;
2196 while ((fp = prev_fp->nextfp)) {
2198 prev_fp->nextfp = fp->nextfp;
2204 if (sfp->reserve.bufflen > 0) {
2206 printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
2207 (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
2208 sg_remove_scat(&sfp->reserve);
2210 sfp->parentdp = NULL;
2211 SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
2215 /* Returns 0 in normal case, 1 when detached and sdp object removed */
2217 sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
2224 for (srp = sfp->headrp; srp; srp = tsrp) {
2226 if (sg_srp_done(srp, sfp))
2227 sg_finish_rem_req(srp);
2232 unsigned long iflags;
2234 write_lock_irqsave(&sg_index_lock, iflags);
2235 __sg_remove_sfp(sdp, sfp);
2236 if (sdp->detached && (NULL == sdp->headfp)) {
2237 idr_remove(&sg_index_idr, sdp->index);
2241 write_unlock_irqrestore(&sg_index_lock, iflags);
2243 /* MOD_INC's to inhibit unloading sg and associated adapter driver */
2244 /* only bump the access_count if we actually succeeded in
2245 * throwing another counter on the host module */
2246 scsi_device_get(sdp->device); /* XXX: retval ignored? */
2247 sfp->closed = 1; /* flag dirty state on this fd */
2248 SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
2255 sg_res_in_use(Sg_fd * sfp)
2257 const Sg_request *srp;
2258 unsigned long iflags;
2260 read_lock_irqsave(&sfp->rq_list_lock, iflags);
2261 for (srp = sfp->headrp; srp; srp = srp->nextrp)
2264 read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
2268 #ifdef CONFIG_SCSI_PROC_FS
2270 sg_idr_max_id(int id, void *p, void *data)
2284 unsigned long iflags;
2286 read_lock_irqsave(&sg_index_lock, iflags);
2287 idr_for_each(&sg_index_idr, sg_idr_max_id, &k);
2288 read_unlock_irqrestore(&sg_index_lock, iflags);
2289 return k + 1; /* origin 1 */
2297 unsigned long iflags;
2299 read_lock_irqsave(&sg_index_lock, iflags);
2300 sdp = idr_find(&sg_index_idr, dev);
2301 read_unlock_irqrestore(&sg_index_lock, iflags);
2306 #ifdef CONFIG_SCSI_PROC_FS
2308 static struct proc_dir_entry *sg_proc_sgp = NULL;
2310 static char sg_proc_sg_dirname[] = "scsi/sg";
2312 static int sg_proc_seq_show_int(struct seq_file *s, void *v);
2314 static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
2315 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
2316 size_t count, loff_t *off);
2317 static struct file_operations adio_fops = {
2318 /* .owner, .read and .llseek added in sg_proc_init() */
2319 .open = sg_proc_single_open_adio,
2320 .write = sg_proc_write_adio,
2321 .release = single_release,
2324 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
2325 static ssize_t sg_proc_write_dressz(struct file *filp,
2326 const char __user *buffer, size_t count, loff_t *off);
2327 static struct file_operations dressz_fops = {
2328 .open = sg_proc_single_open_dressz,
2329 .write = sg_proc_write_dressz,
2330 .release = single_release,
2333 static int sg_proc_seq_show_version(struct seq_file *s, void *v);
2334 static int sg_proc_single_open_version(struct inode *inode, struct file *file);
2335 static struct file_operations version_fops = {
2336 .open = sg_proc_single_open_version,
2337 .release = single_release,
2340 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
2341 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
2342 static struct file_operations devhdr_fops = {
2343 .open = sg_proc_single_open_devhdr,
2344 .release = single_release,
2347 static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
2348 static int sg_proc_open_dev(struct inode *inode, struct file *file);
2349 static void * dev_seq_start(struct seq_file *s, loff_t *pos);
2350 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
2351 static void dev_seq_stop(struct seq_file *s, void *v);
2352 static struct file_operations dev_fops = {
2353 .open = sg_proc_open_dev,
2354 .release = seq_release,
2356 static struct seq_operations dev_seq_ops = {
2357 .start = dev_seq_start,
2358 .next = dev_seq_next,
2359 .stop = dev_seq_stop,
2360 .show = sg_proc_seq_show_dev,
2363 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
2364 static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
2365 static struct file_operations devstrs_fops = {
2366 .open = sg_proc_open_devstrs,
2367 .release = seq_release,
2369 static struct seq_operations devstrs_seq_ops = {
2370 .start = dev_seq_start,
2371 .next = dev_seq_next,
2372 .stop = dev_seq_stop,
2373 .show = sg_proc_seq_show_devstrs,
2376 static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
2377 static int sg_proc_open_debug(struct inode *inode, struct file *file);
2378 static struct file_operations debug_fops = {
2379 .open = sg_proc_open_debug,
2380 .release = seq_release,
2382 static struct seq_operations debug_seq_ops = {
2383 .start = dev_seq_start,
2384 .next = dev_seq_next,
2385 .stop = dev_seq_stop,
2386 .show = sg_proc_seq_show_debug,
2390 struct sg_proc_leaf {
2392 struct file_operations * fops;
2395 static struct sg_proc_leaf sg_proc_leaf_arr[] = {
2396 {"allow_dio", &adio_fops},
2397 {"debug", &debug_fops},
2398 {"def_reserved_size", &dressz_fops},
2399 {"device_hdr", &devhdr_fops},
2400 {"devices", &dev_fops},
2401 {"device_strs", &devstrs_fops},
2402 {"version", &version_fops}
2409 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2410 struct sg_proc_leaf * leaf;
2412 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
2415 for (k = 0; k < num_leaves; ++k) {
2416 leaf = &sg_proc_leaf_arr[k];
2417 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
2418 leaf->fops->owner = THIS_MODULE;
2419 leaf->fops->read = seq_read;
2420 leaf->fops->llseek = seq_lseek;
2421 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops);
2427 sg_proc_cleanup(void)
2430 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
2434 for (k = 0; k < num_leaves; ++k)
2435 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
2436 remove_proc_entry(sg_proc_sg_dirname, NULL);
2440 static int sg_proc_seq_show_int(struct seq_file *s, void *v)
2442 seq_printf(s, "%d\n", *((int *)s->private));
2446 static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
2448 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
2452 sg_proc_write_adio(struct file *filp, const char __user *buffer,
2453 size_t count, loff_t *off)
2458 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2460 num = (count < 10) ? count : 10;
2461 if (copy_from_user(buff, buffer, num))
2464 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
2468 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
2470 return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
2474 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
2475 size_t count, loff_t *off)
2478 unsigned long k = ULONG_MAX;
2481 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2483 num = (count < 10) ? count : 10;
2484 if (copy_from_user(buff, buffer, num))
2487 k = simple_strtoul(buff, NULL, 10);
2488 if (k <= 1048576) { /* limit "big buff" to 1 MB */
2495 static int sg_proc_seq_show_version(struct seq_file *s, void *v)
2497 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
2502 static int sg_proc_single_open_version(struct inode *inode, struct file *file)
2504 return single_open(file, sg_proc_seq_show_version, NULL);
2507 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
2509 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
2514 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
2516 return single_open(file, sg_proc_seq_show_devhdr, NULL);
2519 struct sg_proc_deviter {
2524 static void * dev_seq_start(struct seq_file *s, loff_t *pos)
2526 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
2533 it->max = sg_last_dev();
2534 if (it->index >= it->max)
2539 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
2541 struct sg_proc_deviter * it = s->private;
2544 return (it->index < it->max) ? it : NULL;
2547 static void dev_seq_stop(struct seq_file *s, void *v)
2552 static int sg_proc_open_dev(struct inode *inode, struct file *file)
2554 return seq_open(file, &dev_seq_ops);
2557 static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
2559 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2561 struct scsi_device *scsidp;
2563 sdp = it ? sg_get_dev(it->index) : NULL;
2564 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2565 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
2566 scsidp->host->host_no, scsidp->channel,
2567 scsidp->id, scsidp->lun, (int) scsidp->type,
2569 (int) scsidp->queue_depth,
2570 (int) scsidp->device_busy,
2571 (int) scsi_device_online(scsidp));
2573 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
2577 static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
2579 return seq_open(file, &devstrs_seq_ops);
2582 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
2584 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2586 struct scsi_device *scsidp;
2588 sdp = it ? sg_get_dev(it->index) : NULL;
2589 if (sdp && (scsidp = sdp->device) && (!sdp->detached))
2590 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
2591 scsidp->vendor, scsidp->model, scsidp->rev);
2593 seq_printf(s, "<no active device>\n");
2597 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
2599 int k, m, new_interface, blen, usg;
2602 const sg_io_hdr_t *hp;
2606 for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
2607 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
2608 "(res)sgat=%d low_dma=%d\n", k + 1,
2609 jiffies_to_msecs(fp->timeout),
2610 fp->reserve.bufflen,
2611 (int) fp->reserve.k_use_sg,
2613 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
2614 (int) fp->cmd_q, (int) fp->force_packid,
2615 (int) fp->keep_orphan, (int) fp->closed);
2616 for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
2618 new_interface = (hp->interface_id == '\0') ? 0 : 1;
2619 if (srp->res_used) {
2620 if (new_interface &&
2621 (SG_FLAG_MMAP_IO & hp->flags))
2626 if (SG_INFO_DIRECT_IO_MASK & hp->info)
2632 blen = srp->data.bufflen;
2633 usg = srp->data.k_use_sg;
2634 seq_printf(s, srp->done ?
2635 ((1 == srp->done) ? "rcv:" : "fin:")
2637 seq_printf(s, " id=%d blen=%d",
2638 srp->header.pack_id, blen);
2640 seq_printf(s, " dur=%d", hp->duration);
2642 ms = jiffies_to_msecs(jiffies);
2643 seq_printf(s, " t_o/elap=%d/%d",
2644 (new_interface ? hp->timeout :
2645 jiffies_to_msecs(fp->timeout)),
2646 (ms > hp->duration ? ms - hp->duration : 0));
2648 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
2649 (int) srp->data.cmd_opcode);
2652 seq_printf(s, " No requests active\n");
2656 static int sg_proc_open_debug(struct inode *inode, struct file *file)
2658 return seq_open(file, &debug_seq_ops);
2661 static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
2663 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
2666 if (it && (0 == it->index)) {
2667 seq_printf(s, "max_active_device=%d(origin 1)\n",
2669 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
2671 sdp = it ? sg_get_dev(it->index) : NULL;
2673 struct scsi_device *scsidp = sdp->device;
2675 if (NULL == scsidp) {
2676 seq_printf(s, "device %d detached ??\n",
2681 if (sg_get_nth_sfp(sdp, 0)) {
2682 seq_printf(s, " >>> device=%s ",
2683 sdp->disk->disk_name);
2685 seq_printf(s, "detached pending close ");
2688 (s, "scsi%d chan=%d id=%d lun=%d em=%d",
2689 scsidp->host->host_no,
2690 scsidp->channel, scsidp->id,
2692 scsidp->host->hostt->emulated);
2693 seq_printf(s, " sg_tablesize=%d excl=%d\n",
2694 sdp->sg_tablesize, sdp->exclude);
2696 sg_proc_debug_helper(s, sdp);
2701 #endif /* CONFIG_SCSI_PROC_FS */
2703 module_init(init_sg);
2704 module_exit(exit_sg);