Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * History: | |
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 | |
6 | * | |
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 | |
11 | * | |
12 | * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
13 | * | |
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) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | ||
b2155d04 DG |
21 | static int sg_version_num = 30534; /* 2 digits for each component */ |
22 | #define SG_VERSION_STR "3.5.34" | |
1da177e4 LT |
23 | |
24 | /* | |
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). | |
29 | * | |
30 | */ | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
33 | #include <linux/fs.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/mm.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> | |
1da177e4 | 44 | #include <linux/moduleparam.h> |
1da177e4 | 45 | #include <linux/cdev.h> |
7c07d613 | 46 | #include <linux/idr.h> |
1da177e4 LT |
47 | #include <linux/seq_file.h> |
48 | #include <linux/blkdev.h> | |
49 | #include <linux/delay.h> | |
6da127ad | 50 | #include <linux/blktrace_api.h> |
eb09d3d4 | 51 | #include <linux/smp_lock.h> |
1da177e4 LT |
52 | |
53 | #include "scsi.h" | |
db9dff36 | 54 | #include <scsi/scsi_dbg.h> |
1da177e4 LT |
55 | #include <scsi/scsi_host.h> |
56 | #include <scsi/scsi_driver.h> | |
57 | #include <scsi/scsi_ioctl.h> | |
58 | #include <scsi/sg.h> | |
59 | ||
60 | #include "scsi_logging.h" | |
61 | ||
62 | #ifdef CONFIG_SCSI_PROC_FS | |
63 | #include <linux/proc_fs.h> | |
7ca63cb4 | 64 | static char *sg_version_date = "20061027"; |
1da177e4 LT |
65 | |
66 | static int sg_proc_init(void); | |
67 | static void sg_proc_cleanup(void); | |
68 | #endif | |
69 | ||
1da177e4 | 70 | #define SG_ALLOW_DIO_DEF 0 |
1da177e4 LT |
71 | |
72 | #define SG_MAX_DEVS 32768 | |
73 | ||
74 | /* | |
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 | |
81 | * in 32 bits. | |
82 | */ | |
83 | #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) | |
84 | ||
85 | #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) | |
86 | ||
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; | |
96 | ||
6460e75a DG |
97 | static int scatter_elem_sz = SG_SCATTER_SZ; |
98 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; | |
99 | ||
1da177e4 | 100 | #define SG_SECTOR_SZ 512 |
1da177e4 | 101 | |
ee959b00 TJ |
102 | static int sg_add(struct device *, struct class_interface *); |
103 | static void sg_remove(struct device *, struct class_interface *); | |
1da177e4 | 104 | |
7c07d613 JB |
105 | static DEFINE_IDR(sg_index_idr); |
106 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock | |
1da177e4 LT |
107 | file descriptor list for device */ |
108 | ||
109 | static struct class_interface sg_interface = { | |
ee959b00 TJ |
110 | .add_dev = sg_add, |
111 | .remove_dev = sg_remove, | |
1da177e4 LT |
112 | }; |
113 | ||
114 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
115 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
ea312552 | 116 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
1da177e4 | 117 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
10db10d1 FT |
118 | struct page **pages; |
119 | int page_order; | |
1da177e4 LT |
120 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
121 | unsigned char cmd_opcode; /* first byte of command */ | |
122 | } Sg_scatter_hold; | |
123 | ||
124 | struct sg_device; /* forward declarations */ | |
125 | struct sg_fd; | |
126 | ||
127 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
1da177e4 LT |
128 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ |
129 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
130 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
131 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
d6b10348 | 132 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
1da177e4 LT |
133 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
134 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
135 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
136 | volatile char done; /* 0->before bh, 1->before read, 2->read */ | |
10865dfa | 137 | struct request *rq; |
6e5a30cb | 138 | struct bio *bio; |
c96952ed | 139 | struct execute_work ew; |
1da177e4 LT |
140 | } Sg_request; |
141 | ||
142 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
3442f802 | 143 | struct list_head sfd_siblings; |
1da177e4 LT |
144 | struct sg_device *parentdp; /* owning device */ |
145 | wait_queue_head_t read_wait; /* queue read until command done */ | |
146 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
147 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
148 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
149 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
150 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
151 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
152 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
153 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
154 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
155 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
156 | volatile char closed; /* 1 -> fd closed but request(s) outstanding */ | |
157 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
158 | char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ | |
159 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
160 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
c6517b79 TB |
161 | struct kref f_ref; |
162 | struct execute_work ew; | |
1da177e4 LT |
163 | } Sg_fd; |
164 | ||
165 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
166 | struct scsi_device *device; | |
167 | wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ | |
168 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
7c07d613 | 169 | u32 index; /* device index number */ |
3442f802 | 170 | struct list_head sfds; |
1da177e4 LT |
171 | volatile char detached; /* 0->attached, 1->detached pending removal */ |
172 | volatile char exclude; /* opened for exclusive access */ | |
173 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ | |
174 | struct gendisk *disk; | |
175 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
c6517b79 | 176 | struct kref d_ref; |
1da177e4 LT |
177 | } Sg_device; |
178 | ||
d6b10348 | 179 | /* tasklet or soft irq callback */ |
a91a3a20 | 180 | static void sg_rq_end_io(struct request *rq, int uptodate); |
10865dfa | 181 | static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
e7ee4cc0 | 182 | static int sg_finish_rem_req(Sg_request * srp); |
1da177e4 | 183 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); |
1da177e4 LT |
184 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, |
185 | Sg_request * srp); | |
0b07de85 AG |
186 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
187 | const char __user *buf, size_t count, int blocking, | |
a2dd3b4c | 188 | int read_only, int sg_io_owned, Sg_request **o_srp); |
1da177e4 LT |
189 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
190 | unsigned char *cmnd, int timeout, int blocking); | |
1da177e4 LT |
191 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); |
192 | static void sg_remove_scat(Sg_scatter_hold * schp); | |
193 | static void sg_build_reserve(Sg_fd * sfp, int req_size); | |
194 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
195 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
1da177e4 | 196 | static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); |
c6517b79 | 197 | static void sg_remove_sfp(struct kref *); |
1da177e4 LT |
198 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); |
199 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
200 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
201 | static int sg_res_in_use(Sg_fd * sfp); | |
1da177e4 | 202 | static Sg_device *sg_get_dev(int dev); |
c6517b79 | 203 | static void sg_put_dev(Sg_device *sdp); |
1da177e4 | 204 | |
1da177e4 LT |
205 | #define SZ_SG_HEADER sizeof(struct sg_header) |
206 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
207 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
208 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
209 | ||
14e507b8 FT |
210 | static int sg_allow_access(struct file *filp, unsigned char *cmd) |
211 | { | |
212 | struct sg_fd *sfp = (struct sg_fd *)filp->private_data; | |
14e507b8 FT |
213 | |
214 | if (sfp->parentdp->device->type == TYPE_SCANNER) | |
215 | return 0; | |
216 | ||
018e0446 | 217 | return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); |
14e507b8 FT |
218 | } |
219 | ||
1da177e4 LT |
220 | static int |
221 | sg_open(struct inode *inode, struct file *filp) | |
222 | { | |
223 | int dev = iminor(inode); | |
224 | int flags = filp->f_flags; | |
d6b10348 | 225 | struct request_queue *q; |
1da177e4 LT |
226 | Sg_device *sdp; |
227 | Sg_fd *sfp; | |
228 | int res; | |
229 | int retval; | |
230 | ||
eb09d3d4 | 231 | lock_kernel(); |
1da177e4 LT |
232 | nonseekable_open(inode, filp); |
233 | SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); | |
234 | sdp = sg_get_dev(dev); | |
c6517b79 TB |
235 | if (IS_ERR(sdp)) { |
236 | retval = PTR_ERR(sdp); | |
237 | sdp = NULL; | |
238 | goto sg_put; | |
eb09d3d4 | 239 | } |
1da177e4 LT |
240 | |
241 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
242 | /* Prevent the device driver from vanishing while we sleep */ | |
243 | retval = scsi_device_get(sdp->device); | |
c6517b79 TB |
244 | if (retval) |
245 | goto sg_put; | |
1da177e4 LT |
246 | |
247 | if (!((flags & O_NONBLOCK) || | |
248 | scsi_block_when_processing_errors(sdp->device))) { | |
249 | retval = -ENXIO; | |
250 | /* we are in error recovery for this device */ | |
251 | goto error_out; | |
252 | } | |
253 | ||
254 | if (flags & O_EXCL) { | |
255 | if (O_RDONLY == (flags & O_ACCMODE)) { | |
256 | retval = -EPERM; /* Can't lock it with read only access */ | |
257 | goto error_out; | |
258 | } | |
3442f802 | 259 | if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) { |
1da177e4 LT |
260 | retval = -EBUSY; |
261 | goto error_out; | |
262 | } | |
263 | res = 0; | |
264 | __wait_event_interruptible(sdp->o_excl_wait, | |
3442f802 | 265 | ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); |
1da177e4 LT |
266 | if (res) { |
267 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
268 | goto error_out; | |
269 | } | |
270 | } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ | |
271 | if (flags & O_NONBLOCK) { | |
272 | retval = -EBUSY; | |
273 | goto error_out; | |
274 | } | |
275 | res = 0; | |
276 | __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), | |
277 | res); | |
278 | if (res) { | |
279 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
280 | goto error_out; | |
281 | } | |
282 | } | |
283 | if (sdp->detached) { | |
284 | retval = -ENODEV; | |
285 | goto error_out; | |
286 | } | |
3442f802 | 287 | if (list_empty(&sdp->sfds)) { /* no existing opens on this device */ |
1da177e4 | 288 | sdp->sgdebug = 0; |
d6b10348 | 289 | q = sdp->device->request_queue; |
8a78362c | 290 | sdp->sg_tablesize = queue_max_segments(q); |
1da177e4 LT |
291 | } |
292 | if ((sfp = sg_add_sfp(sdp, dev))) | |
293 | filp->private_data = sfp; | |
294 | else { | |
c6517b79 | 295 | if (flags & O_EXCL) { |
1da177e4 | 296 | sdp->exclude = 0; /* undo if error */ |
c6517b79 TB |
297 | wake_up_interruptible(&sdp->o_excl_wait); |
298 | } | |
1da177e4 LT |
299 | retval = -ENOMEM; |
300 | goto error_out; | |
301 | } | |
c6517b79 TB |
302 | retval = 0; |
303 | error_out: | |
304 | if (retval) | |
305 | scsi_device_put(sdp->device); | |
306 | sg_put: | |
307 | if (sdp) | |
308 | sg_put_dev(sdp); | |
eb09d3d4 | 309 | unlock_kernel(); |
1da177e4 LT |
310 | return retval; |
311 | } | |
312 | ||
313 | /* Following function was formerly called 'sg_close' */ | |
314 | static int | |
315 | sg_release(struct inode *inode, struct file *filp) | |
316 | { | |
317 | Sg_device *sdp; | |
318 | Sg_fd *sfp; | |
319 | ||
320 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
321 | return -ENXIO; | |
322 | SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); | |
c6517b79 TB |
323 | |
324 | sfp->closed = 1; | |
325 | ||
326 | sdp->exclude = 0; | |
327 | wake_up_interruptible(&sdp->o_excl_wait); | |
328 | ||
329 | kref_put(&sfp->f_ref, sg_remove_sfp); | |
1da177e4 LT |
330 | return 0; |
331 | } | |
332 | ||
333 | static ssize_t | |
334 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
335 | { | |
1da177e4 LT |
336 | Sg_device *sdp; |
337 | Sg_fd *sfp; | |
338 | Sg_request *srp; | |
339 | int req_pack_id = -1; | |
1da177e4 | 340 | sg_io_hdr_t *hp; |
cb59e840 | 341 | struct sg_header *old_hdr = NULL; |
342 | int retval = 0; | |
1da177e4 LT |
343 | |
344 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
345 | return -ENXIO; | |
346 | SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", | |
347 | sdp->disk->disk_name, (int) count)); | |
d6b10348 | 348 | |
1da177e4 LT |
349 | if (!access_ok(VERIFY_WRITE, buf, count)) |
350 | return -EFAULT; | |
351 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 | 352 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
353 | if (!old_hdr) | |
354 | return -ENOMEM; | |
355 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
356 | retval = -EFAULT; | |
357 | goto free_old_hdr; | |
358 | } | |
359 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 360 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 | 361 | sg_io_hdr_t *new_hdr; |
362 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
363 | if (!new_hdr) { | |
364 | retval = -ENOMEM; | |
365 | goto free_old_hdr; | |
366 | } | |
367 | retval =__copy_from_user | |
368 | (new_hdr, buf, SZ_SG_IO_HDR); | |
369 | req_pack_id = new_hdr->pack_id; | |
370 | kfree(new_hdr); | |
371 | if (retval) { | |
372 | retval = -EFAULT; | |
373 | goto free_old_hdr; | |
374 | } | |
1da177e4 LT |
375 | } |
376 | } else | |
cb59e840 | 377 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
378 | } |
379 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
380 | if (!srp) { /* now wait on packet to arrive */ | |
cb59e840 | 381 | if (sdp->detached) { |
382 | retval = -ENODEV; | |
383 | goto free_old_hdr; | |
384 | } | |
385 | if (filp->f_flags & O_NONBLOCK) { | |
386 | retval = -EAGAIN; | |
387 | goto free_old_hdr; | |
388 | } | |
1da177e4 | 389 | while (1) { |
cb59e840 | 390 | retval = 0; /* following macro beats race condition */ |
1da177e4 | 391 | __wait_event_interruptible(sfp->read_wait, |
cb59e840 | 392 | (sdp->detached || |
393 | (srp = sg_get_rq_mark(sfp, req_pack_id))), | |
394 | retval); | |
395 | if (sdp->detached) { | |
396 | retval = -ENODEV; | |
397 | goto free_old_hdr; | |
398 | } | |
399 | if (0 == retval) | |
1da177e4 | 400 | break; |
cb59e840 | 401 | |
402 | /* -ERESTARTSYS as signal hit process */ | |
403 | goto free_old_hdr; | |
1da177e4 LT |
404 | } |
405 | } | |
cb59e840 | 406 | if (srp->header.interface_id != '\0') { |
407 | retval = sg_new_read(sfp, buf, count, srp); | |
408 | goto free_old_hdr; | |
409 | } | |
1da177e4 LT |
410 | |
411 | hp = &srp->header; | |
cb59e840 | 412 | if (old_hdr == NULL) { |
413 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
414 | if (! old_hdr) { | |
415 | retval = -ENOMEM; | |
416 | goto free_old_hdr; | |
417 | } | |
418 | } | |
419 | memset(old_hdr, 0, SZ_SG_HEADER); | |
420 | old_hdr->reply_len = (int) hp->timeout; | |
421 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
422 | old_hdr->pack_id = hp->pack_id; | |
423 | old_hdr->twelve_byte = | |
1da177e4 | 424 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 | 425 | old_hdr->target_status = hp->masked_status; |
426 | old_hdr->host_status = hp->host_status; | |
427 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
428 | if ((CHECK_CONDITION & hp->masked_status) || |
429 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 | 430 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
431 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
432 | switch (hp->host_status) { |
433 | /* This setup of 'result' is for backward compatibility and is best | |
434 | ignored by the user who should use target, host + driver status */ | |
435 | case DID_OK: | |
436 | case DID_PASSTHROUGH: | |
437 | case DID_SOFT_ERROR: | |
cb59e840 | 438 | old_hdr->result = 0; |
1da177e4 LT |
439 | break; |
440 | case DID_NO_CONNECT: | |
441 | case DID_BUS_BUSY: | |
442 | case DID_TIME_OUT: | |
cb59e840 | 443 | old_hdr->result = EBUSY; |
1da177e4 LT |
444 | break; |
445 | case DID_BAD_TARGET: | |
446 | case DID_ABORT: | |
447 | case DID_PARITY: | |
448 | case DID_RESET: | |
449 | case DID_BAD_INTR: | |
cb59e840 | 450 | old_hdr->result = EIO; |
1da177e4 LT |
451 | break; |
452 | case DID_ERROR: | |
cb59e840 | 453 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
454 | hp->masked_status == GOOD) ? 0 : EIO; |
455 | break; | |
456 | default: | |
cb59e840 | 457 | old_hdr->result = EIO; |
1da177e4 LT |
458 | break; |
459 | } | |
460 | ||
461 | /* Now copy the result back to the user buffer. */ | |
462 | if (count >= SZ_SG_HEADER) { | |
cb59e840 | 463 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
464 | retval = -EFAULT; | |
465 | goto free_old_hdr; | |
466 | } | |
1da177e4 | 467 | buf += SZ_SG_HEADER; |
cb59e840 | 468 | if (count > old_hdr->reply_len) |
469 | count = old_hdr->reply_len; | |
1da177e4 | 470 | if (count > SZ_SG_HEADER) { |
cb59e840 | 471 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
472 | retval = -EFAULT; | |
473 | goto free_old_hdr; | |
474 | } | |
1da177e4 LT |
475 | } |
476 | } else | |
cb59e840 | 477 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 478 | sg_finish_rem_req(srp); |
cb59e840 | 479 | retval = count; |
480 | free_old_hdr: | |
c9475cb0 | 481 | kfree(old_hdr); |
cb59e840 | 482 | return retval; |
1da177e4 LT |
483 | } |
484 | ||
485 | static ssize_t | |
486 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
487 | { | |
488 | sg_io_hdr_t *hp = &srp->header; | |
489 | int err = 0; | |
490 | int len; | |
491 | ||
492 | if (count < SZ_SG_IO_HDR) { | |
493 | err = -EINVAL; | |
494 | goto err_out; | |
495 | } | |
496 | hp->sb_len_wr = 0; | |
497 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
498 | if ((CHECK_CONDITION & hp->masked_status) || | |
499 | (DRIVER_SENSE & hp->driver_status)) { | |
d6b10348 | 500 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
501 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
502 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
503 | len = (len > sb_len) ? sb_len : len; | |
504 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
505 | err = -EFAULT; | |
506 | goto err_out; | |
507 | } | |
508 | hp->sb_len_wr = len; | |
509 | } | |
510 | } | |
511 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
512 | hp->info |= SG_INFO_CHECK; | |
513 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
514 | err = -EFAULT; | |
515 | goto err_out; | |
516 | } | |
0b6cb26c | 517 | err_out: |
e7ee4cc0 | 518 | err = sg_finish_rem_req(srp); |
1da177e4 LT |
519 | return (0 == err) ? count : err; |
520 | } | |
521 | ||
522 | static ssize_t | |
523 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
524 | { | |
525 | int mxsize, cmd_size, k; | |
526 | int input_size, blocking; | |
527 | unsigned char opcode; | |
528 | Sg_device *sdp; | |
529 | Sg_fd *sfp; | |
530 | Sg_request *srp; | |
531 | struct sg_header old_hdr; | |
532 | sg_io_hdr_t *hp; | |
d6b10348 | 533 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
534 | |
535 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
536 | return -ENXIO; | |
537 | SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", | |
538 | sdp->disk->disk_name, (int) count)); | |
539 | if (sdp->detached) | |
540 | return -ENODEV; | |
541 | if (!((filp->f_flags & O_NONBLOCK) || | |
542 | scsi_block_when_processing_errors(sdp->device))) | |
543 | return -ENXIO; | |
544 | ||
545 | if (!access_ok(VERIFY_READ, buf, count)) | |
546 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
547 | if (count < SZ_SG_HEADER) | |
548 | return -EIO; | |
549 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
550 | return -EFAULT; | |
551 | blocking = !(filp->f_flags & O_NONBLOCK); | |
552 | if (old_hdr.reply_len < 0) | |
a2dd3b4c TB |
553 | return sg_new_write(sfp, filp, buf, count, |
554 | blocking, 0, 0, NULL); | |
1da177e4 LT |
555 | if (count < (SZ_SG_HEADER + 6)) |
556 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
557 | ||
558 | if (!(srp = sg_add_request(sfp))) { | |
559 | SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); | |
560 | return -EDOM; | |
561 | } | |
562 | buf += SZ_SG_HEADER; | |
563 | __get_user(opcode, buf); | |
564 | if (sfp->next_cmd_len > 0) { | |
565 | if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { | |
566 | SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); | |
567 | sfp->next_cmd_len = 0; | |
568 | sg_remove_request(sfp, srp); | |
569 | return -EIO; | |
570 | } | |
571 | cmd_size = sfp->next_cmd_len; | |
572 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
573 | } else { | |
574 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
575 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
576 | cmd_size = 12; | |
577 | } | |
578 | SCSI_LOG_TIMEOUT(4, printk( | |
579 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
580 | /* Determine buffer size. */ | |
581 | input_size = count - cmd_size; | |
582 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
583 | mxsize -= SZ_SG_HEADER; | |
584 | input_size -= SZ_SG_HEADER; | |
585 | if (input_size < 0) { | |
586 | sg_remove_request(sfp, srp); | |
587 | return -EIO; /* User did not pass enough bytes for this command. */ | |
588 | } | |
589 | hp = &srp->header; | |
590 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
591 | hp->cmd_len = (unsigned char) cmd_size; | |
592 | hp->iovec_count = 0; | |
593 | hp->mx_sb_len = 0; | |
594 | if (input_size > 0) | |
595 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
596 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
597 | else | |
598 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
599 | hp->dxfer_len = mxsize; | |
fad7f01e FT |
600 | if (hp->dxfer_direction == SG_DXFER_TO_DEV) |
601 | hp->dxferp = (char __user *)buf + cmd_size; | |
602 | else | |
603 | hp->dxferp = NULL; | |
1da177e4 LT |
604 | hp->sbp = NULL; |
605 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
606 | hp->flags = input_size; /* structure abuse ... */ | |
607 | hp->pack_id = old_hdr.pack_id; | |
608 | hp->usr_ptr = NULL; | |
609 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
610 | return -EFAULT; | |
611 | /* | |
612 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
613 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
614 | * is a non-zero input_size, so emit a warning. | |
615 | */ | |
eaa3e22e AK |
616 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
617 | static char cmd[TASK_COMM_LEN]; | |
618 | if (strcmp(current->comm, cmd) && printk_ratelimit()) { | |
1da177e4 LT |
619 | printk(KERN_WARNING |
620 | "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" | |
ad361c98 | 621 | "guessing data in;\n " |
1da177e4 LT |
622 | "program %s not setting count and/or reply_len properly\n", |
623 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
624 | input_size, (unsigned int) cmnd[0], | |
625 | current->comm); | |
eaa3e22e AK |
626 | strcpy(cmd, current->comm); |
627 | } | |
628 | } | |
1da177e4 LT |
629 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
630 | return (k < 0) ? k : count; | |
631 | } | |
632 | ||
633 | static ssize_t | |
0b07de85 | 634 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
a2dd3b4c | 635 | size_t count, int blocking, int read_only, int sg_io_owned, |
0b07de85 | 636 | Sg_request **o_srp) |
1da177e4 LT |
637 | { |
638 | int k; | |
639 | Sg_request *srp; | |
640 | sg_io_hdr_t *hp; | |
d6b10348 | 641 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
642 | int timeout; |
643 | unsigned long ul_timeout; | |
644 | ||
645 | if (count < SZ_SG_IO_HDR) | |
646 | return -EINVAL; | |
647 | if (!access_ok(VERIFY_READ, buf, count)) | |
648 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
649 | ||
650 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
651 | if (!(srp = sg_add_request(sfp))) { | |
652 | SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); | |
653 | return -EDOM; | |
654 | } | |
a2dd3b4c | 655 | srp->sg_io_owned = sg_io_owned; |
1da177e4 LT |
656 | hp = &srp->header; |
657 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
658 | sg_remove_request(sfp, srp); | |
659 | return -EFAULT; | |
660 | } | |
661 | if (hp->interface_id != 'S') { | |
662 | sg_remove_request(sfp, srp); | |
663 | return -ENOSYS; | |
664 | } | |
665 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
666 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
667 | sg_remove_request(sfp, srp); | |
668 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
669 | } | |
670 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
671 | sg_remove_request(sfp, srp); | |
672 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
673 | } | |
674 | if (sg_res_in_use(sfp)) { | |
675 | sg_remove_request(sfp, srp); | |
676 | return -EBUSY; /* reserve buffer already being used */ | |
677 | } | |
678 | } | |
679 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
680 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
681 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
682 | sg_remove_request(sfp, srp); | |
683 | return -EMSGSIZE; | |
684 | } | |
685 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
686 | sg_remove_request(sfp, srp); | |
687 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
688 | } | |
689 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
690 | sg_remove_request(sfp, srp); | |
691 | return -EFAULT; | |
692 | } | |
14e507b8 | 693 | if (read_only && sg_allow_access(file, cmnd)) { |
1da177e4 LT |
694 | sg_remove_request(sfp, srp); |
695 | return -EPERM; | |
696 | } | |
697 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
698 | if (k < 0) | |
699 | return k; | |
700 | if (o_srp) | |
701 | *o_srp = srp; | |
702 | return count; | |
703 | } | |
704 | ||
705 | static int | |
706 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
707 | unsigned char *cmnd, int timeout, int blocking) | |
708 | { | |
d6b10348 | 709 | int k, data_dir; |
1da177e4 LT |
710 | Sg_device *sdp = sfp->parentdp; |
711 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
712 | |
713 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
714 | hp->status = 0; | |
715 | hp->masked_status = 0; | |
716 | hp->msg_status = 0; | |
717 | hp->info = 0; | |
718 | hp->host_status = 0; | |
719 | hp->driver_status = 0; | |
720 | hp->resid = 0; | |
721 | SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
722 | (int) cmnd[0], (int) hp->cmd_len)); | |
723 | ||
10865dfa FT |
724 | k = sg_start_req(srp, cmnd); |
725 | if (k) { | |
7ca63cb4 | 726 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); |
1da177e4 LT |
727 | sg_finish_rem_req(srp); |
728 | return k; /* probably out of space --> ENOMEM */ | |
729 | } | |
1da177e4 LT |
730 | if (sdp->detached) { |
731 | sg_finish_rem_req(srp); | |
732 | return -ENODEV; | |
733 | } | |
1da177e4 | 734 | |
1da177e4 LT |
735 | switch (hp->dxfer_direction) { |
736 | case SG_DXFER_TO_FROM_DEV: | |
737 | case SG_DXFER_FROM_DEV: | |
d6b10348 | 738 | data_dir = DMA_FROM_DEVICE; |
1da177e4 LT |
739 | break; |
740 | case SG_DXFER_TO_DEV: | |
d6b10348 | 741 | data_dir = DMA_TO_DEVICE; |
1da177e4 LT |
742 | break; |
743 | case SG_DXFER_UNKNOWN: | |
d6b10348 | 744 | data_dir = DMA_BIDIRECTIONAL; |
1da177e4 LT |
745 | break; |
746 | default: | |
d6b10348 | 747 | data_dir = DMA_NONE; |
1da177e4 LT |
748 | break; |
749 | } | |
cb59e840 | 750 | hp->duration = jiffies_to_msecs(jiffies); |
10db10d1 FT |
751 | |
752 | srp->rq->timeout = timeout; | |
c6517b79 | 753 | kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ |
10db10d1 FT |
754 | blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, |
755 | srp->rq, 1, sg_rq_end_io); | |
756 | return 0; | |
1da177e4 LT |
757 | } |
758 | ||
1da177e4 LT |
759 | static int |
760 | sg_ioctl(struct inode *inode, struct file *filp, | |
761 | unsigned int cmd_in, unsigned long arg) | |
762 | { | |
763 | void __user *p = (void __user *)arg; | |
764 | int __user *ip = p; | |
765 | int result, val, read_only; | |
766 | Sg_device *sdp; | |
767 | Sg_fd *sfp; | |
768 | Sg_request *srp; | |
769 | unsigned long iflags; | |
770 | ||
771 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
772 | return -ENXIO; | |
abf54393 | 773 | |
1da177e4 LT |
774 | SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", |
775 | sdp->disk->disk_name, (int) cmd_in)); | |
776 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
777 | ||
778 | switch (cmd_in) { | |
779 | case SG_IO: | |
780 | { | |
781 | int blocking = 1; /* ignore O_NONBLOCK flag */ | |
782 | ||
783 | if (sdp->detached) | |
784 | return -ENODEV; | |
785 | if (!scsi_block_when_processing_errors(sdp->device)) | |
786 | return -ENXIO; | |
787 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
788 | return -EFAULT; | |
789 | result = | |
0b07de85 | 790 | sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
a2dd3b4c | 791 | blocking, read_only, 1, &srp); |
1da177e4 LT |
792 | if (result < 0) |
793 | return result; | |
1da177e4 LT |
794 | while (1) { |
795 | result = 0; /* following macro to beat race condition */ | |
796 | __wait_event_interruptible(sfp->read_wait, | |
a2dd3b4c TB |
797 | (srp->done || sdp->detached), |
798 | result); | |
1da177e4 LT |
799 | if (sdp->detached) |
800 | return -ENODEV; | |
a2dd3b4c TB |
801 | write_lock_irq(&sfp->rq_list_lock); |
802 | if (srp->done) { | |
803 | srp->done = 2; | |
804 | write_unlock_irq(&sfp->rq_list_lock); | |
1da177e4 | 805 | break; |
a2dd3b4c | 806 | } |
1da177e4 | 807 | srp->orphan = 1; |
a2dd3b4c | 808 | write_unlock_irq(&sfp->rq_list_lock); |
1da177e4 LT |
809 | return result; /* -ERESTARTSYS because signal hit process */ |
810 | } | |
1da177e4 LT |
811 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); |
812 | return (result < 0) ? result : 0; | |
813 | } | |
814 | case SG_SET_TIMEOUT: | |
815 | result = get_user(val, ip); | |
816 | if (result) | |
817 | return result; | |
818 | if (val < 0) | |
819 | return -EIO; | |
820 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
821 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
822 | sfp->timeout_user = val; | |
823 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
824 | ||
825 | return 0; | |
826 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
827 | /* strange ..., for backward compatibility */ | |
828 | return sfp->timeout_user; | |
829 | case SG_SET_FORCE_LOW_DMA: | |
830 | result = get_user(val, ip); | |
831 | if (result) | |
832 | return result; | |
833 | if (val) { | |
834 | sfp->low_dma = 1; | |
835 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
836 | val = (int) sfp->reserve.bufflen; | |
837 | sg_remove_scat(&sfp->reserve); | |
838 | sg_build_reserve(sfp, val); | |
839 | } | |
840 | } else { | |
841 | if (sdp->detached) | |
842 | return -ENODEV; | |
843 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
844 | } | |
845 | return 0; | |
846 | case SG_GET_LOW_DMA: | |
847 | return put_user((int) sfp->low_dma, ip); | |
848 | case SG_GET_SCSI_ID: | |
849 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
850 | return -EFAULT; | |
851 | else { | |
852 | sg_scsi_id_t __user *sg_idp = p; | |
853 | ||
854 | if (sdp->detached) | |
855 | return -ENODEV; | |
856 | __put_user((int) sdp->device->host->host_no, | |
857 | &sg_idp->host_no); | |
858 | __put_user((int) sdp->device->channel, | |
859 | &sg_idp->channel); | |
860 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
861 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
862 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
863 | __put_user((short) sdp->device->host->cmd_per_lun, | |
864 | &sg_idp->h_cmd_per_lun); | |
865 | __put_user((short) sdp->device->queue_depth, | |
866 | &sg_idp->d_queue_depth); | |
867 | __put_user(0, &sg_idp->unused[0]); | |
868 | __put_user(0, &sg_idp->unused[1]); | |
869 | return 0; | |
870 | } | |
871 | case SG_SET_FORCE_PACK_ID: | |
872 | result = get_user(val, ip); | |
873 | if (result) | |
874 | return result; | |
875 | sfp->force_packid = val ? 1 : 0; | |
876 | return 0; | |
877 | case SG_GET_PACK_ID: | |
878 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
879 | return -EFAULT; | |
880 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
881 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
882 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
883 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
884 | iflags); | |
885 | __put_user(srp->header.pack_id, ip); | |
886 | return 0; | |
887 | } | |
888 | } | |
889 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
890 | __put_user(-1, ip); | |
891 | return 0; | |
892 | case SG_GET_NUM_WAITING: | |
893 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
894 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
895 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
896 | ++val; | |
897 | } | |
898 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
899 | return put_user(val, ip); | |
900 | case SG_GET_SG_TABLESIZE: | |
901 | return put_user(sdp->sg_tablesize, ip); | |
902 | case SG_SET_RESERVED_SIZE: | |
903 | result = get_user(val, ip); | |
904 | if (result) | |
905 | return result; | |
906 | if (val < 0) | |
907 | return -EINVAL; | |
44ec9542 | 908 | val = min_t(int, val, |
ae03bf63 | 909 | queue_max_sectors(sdp->device->request_queue) * 512); |
1da177e4 LT |
910 | if (val != sfp->reserve.bufflen) { |
911 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
912 | return -EBUSY; | |
913 | sg_remove_scat(&sfp->reserve); | |
914 | sg_build_reserve(sfp, val); | |
915 | } | |
916 | return 0; | |
917 | case SG_GET_RESERVED_SIZE: | |
44ec9542 | 918 | val = min_t(int, sfp->reserve.bufflen, |
ae03bf63 | 919 | queue_max_sectors(sdp->device->request_queue) * 512); |
1da177e4 LT |
920 | return put_user(val, ip); |
921 | case SG_SET_COMMAND_Q: | |
922 | result = get_user(val, ip); | |
923 | if (result) | |
924 | return result; | |
925 | sfp->cmd_q = val ? 1 : 0; | |
926 | return 0; | |
927 | case SG_GET_COMMAND_Q: | |
928 | return put_user((int) sfp->cmd_q, ip); | |
929 | case SG_SET_KEEP_ORPHAN: | |
930 | result = get_user(val, ip); | |
931 | if (result) | |
932 | return result; | |
933 | sfp->keep_orphan = val; | |
934 | return 0; | |
935 | case SG_GET_KEEP_ORPHAN: | |
936 | return put_user((int) sfp->keep_orphan, ip); | |
937 | case SG_NEXT_CMD_LEN: | |
938 | result = get_user(val, ip); | |
939 | if (result) | |
940 | return result; | |
941 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
942 | return 0; | |
943 | case SG_GET_VERSION_NUM: | |
944 | return put_user(sg_version_num, ip); | |
945 | case SG_GET_ACCESS_COUNT: | |
946 | /* faked - we don't have a real access count anymore */ | |
947 | val = (sdp->device ? 1 : 0); | |
948 | return put_user(val, ip); | |
949 | case SG_GET_REQUEST_TABLE: | |
950 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
951 | return -EFAULT; | |
952 | else { | |
cb59e840 | 953 | sg_req_info_t *rinfo; |
954 | unsigned int ms; | |
955 | ||
956 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
957 | GFP_KERNEL); | |
958 | if (!rinfo) | |
959 | return -ENOMEM; | |
1da177e4 LT |
960 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
961 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
962 | ++val, srp = srp ? srp->nextrp : srp) { | |
963 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
964 | if (srp) { | |
965 | rinfo[val].req_state = srp->done + 1; | |
966 | rinfo[val].problem = | |
967 | srp->header.masked_status & | |
968 | srp->header.host_status & | |
969 | srp->header.driver_status; | |
cb59e840 | 970 | if (srp->done) |
971 | rinfo[val].duration = | |
972 | srp->header.duration; | |
973 | else { | |
974 | ms = jiffies_to_msecs(jiffies); | |
975 | rinfo[val].duration = | |
976 | (ms > srp->header.duration) ? | |
977 | (ms - srp->header.duration) : 0; | |
978 | } | |
1da177e4 | 979 | rinfo[val].orphan = srp->orphan; |
cb59e840 | 980 | rinfo[val].sg_io_owned = |
981 | srp->sg_io_owned; | |
982 | rinfo[val].pack_id = | |
983 | srp->header.pack_id; | |
984 | rinfo[val].usr_ptr = | |
985 | srp->header.usr_ptr; | |
1da177e4 LT |
986 | } |
987 | } | |
988 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 | 989 | result = __copy_to_user(p, rinfo, |
990 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
991 | result = result ? -EFAULT : 0; | |
992 | kfree(rinfo); | |
993 | return result; | |
1da177e4 LT |
994 | } |
995 | case SG_EMULATED_HOST: | |
996 | if (sdp->detached) | |
997 | return -ENODEV; | |
998 | return put_user(sdp->device->host->hostt->emulated, ip); | |
999 | case SG_SCSI_RESET: | |
1000 | if (sdp->detached) | |
1001 | return -ENODEV; | |
1002 | if (filp->f_flags & O_NONBLOCK) { | |
939647ee | 1003 | if (scsi_host_in_recovery(sdp->device->host)) |
1da177e4 LT |
1004 | return -EBUSY; |
1005 | } else if (!scsi_block_when_processing_errors(sdp->device)) | |
1006 | return -EBUSY; | |
1007 | result = get_user(val, ip); | |
1008 | if (result) | |
1009 | return result; | |
1010 | if (SG_SCSI_RESET_NOTHING == val) | |
1011 | return 0; | |
1012 | switch (val) { | |
1013 | case SG_SCSI_RESET_DEVICE: | |
1014 | val = SCSI_TRY_RESET_DEVICE; | |
1015 | break; | |
39120e11 BK |
1016 | case SG_SCSI_RESET_TARGET: |
1017 | val = SCSI_TRY_RESET_TARGET; | |
1018 | break; | |
1da177e4 LT |
1019 | case SG_SCSI_RESET_BUS: |
1020 | val = SCSI_TRY_RESET_BUS; | |
1021 | break; | |
1022 | case SG_SCSI_RESET_HOST: | |
1023 | val = SCSI_TRY_RESET_HOST; | |
1024 | break; | |
1025 | default: | |
1026 | return -EINVAL; | |
1027 | } | |
1028 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1029 | return -EACCES; | |
1030 | return (scsi_reset_provider(sdp->device, val) == | |
1031 | SUCCESS) ? 0 : -EIO; | |
1032 | case SCSI_IOCTL_SEND_COMMAND: | |
1033 | if (sdp->detached) | |
1034 | return -ENODEV; | |
1035 | if (read_only) { | |
1036 | unsigned char opcode = WRITE_6; | |
1037 | Scsi_Ioctl_Command __user *siocp = p; | |
1038 | ||
1039 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1040 | return -EFAULT; | |
14e507b8 | 1041 | if (sg_allow_access(filp, &opcode)) |
1da177e4 LT |
1042 | return -EPERM; |
1043 | } | |
e915e872 | 1044 | return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); |
1da177e4 LT |
1045 | case SG_SET_DEBUG: |
1046 | result = get_user(val, ip); | |
1047 | if (result) | |
1048 | return result; | |
1049 | sdp->sgdebug = (char) val; | |
1050 | return 0; | |
1051 | case SCSI_IOCTL_GET_IDLUN: | |
1052 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1053 | case SCSI_IOCTL_PROBE_HOST: | |
1054 | case SG_GET_TRANSFORM: | |
1055 | if (sdp->detached) | |
1056 | return -ENODEV; | |
1057 | return scsi_ioctl(sdp->device, cmd_in, p); | |
44ec9542 | 1058 | case BLKSECTGET: |
ae03bf63 | 1059 | return put_user(queue_max_sectors(sdp->device->request_queue) * 512, |
44ec9542 | 1060 | ip); |
6da127ad CS |
1061 | case BLKTRACESETUP: |
1062 | return blk_trace_setup(sdp->device->request_queue, | |
1063 | sdp->disk->disk_name, | |
76e3a19d | 1064 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
d0deef5b | 1065 | NULL, |
6da127ad CS |
1066 | (char *)arg); |
1067 | case BLKTRACESTART: | |
1068 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1069 | case BLKTRACESTOP: | |
1070 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1071 | case BLKTRACETEARDOWN: | |
1072 | return blk_trace_remove(sdp->device->request_queue); | |
1da177e4 LT |
1073 | default: |
1074 | if (read_only) | |
1075 | return -EPERM; /* don't know so take safe approach */ | |
1076 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | #ifdef CONFIG_COMPAT | |
1081 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1082 | { | |
1083 | Sg_device *sdp; | |
1084 | Sg_fd *sfp; | |
1085 | struct scsi_device *sdev; | |
1086 | ||
1087 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1088 | return -ENXIO; | |
1089 | ||
1090 | sdev = sdp->device; | |
1091 | if (sdev->host->hostt->compat_ioctl) { | |
1092 | int ret; | |
1093 | ||
1094 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1095 | ||
1096 | return ret; | |
1097 | } | |
1098 | ||
1099 | return -ENOIOCTLCMD; | |
1100 | } | |
1101 | #endif | |
1102 | ||
1103 | static unsigned int | |
1104 | sg_poll(struct file *filp, poll_table * wait) | |
1105 | { | |
1106 | unsigned int res = 0; | |
1107 | Sg_device *sdp; | |
1108 | Sg_fd *sfp; | |
1109 | Sg_request *srp; | |
1110 | int count = 0; | |
1111 | unsigned long iflags; | |
1112 | ||
1113 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) | |
1114 | || sfp->closed) | |
1115 | return POLLERR; | |
1116 | poll_wait(filp, &sfp->read_wait, wait); | |
1117 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1118 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1119 | /* if any read waiting, flag it */ | |
1120 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1121 | res = POLLIN | POLLRDNORM; | |
1122 | ++count; | |
1123 | } | |
1124 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1125 | ||
1126 | if (sdp->detached) | |
1127 | res |= POLLHUP; | |
1128 | else if (!sfp->cmd_q) { | |
1129 | if (0 == count) | |
1130 | res |= POLLOUT | POLLWRNORM; | |
1131 | } else if (count < SG_MAX_QUEUE) | |
1132 | res |= POLLOUT | POLLWRNORM; | |
1133 | SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", | |
1134 | sdp->disk->disk_name, (int) res)); | |
1135 | return res; | |
1136 | } | |
1137 | ||
1138 | static int | |
1139 | sg_fasync(int fd, struct file *filp, int mode) | |
1140 | { | |
1da177e4 LT |
1141 | Sg_device *sdp; |
1142 | Sg_fd *sfp; | |
1143 | ||
1144 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1145 | return -ENXIO; | |
1146 | SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", | |
1147 | sdp->disk->disk_name, mode)); | |
1148 | ||
60aa4924 | 1149 | return fasync_helper(fd, filp, mode, &sfp->async_qp); |
1da177e4 LT |
1150 | } |
1151 | ||
a13ff0bb NP |
1152 | static int |
1153 | sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1da177e4 LT |
1154 | { |
1155 | Sg_fd *sfp; | |
d6b10348 | 1156 | unsigned long offset, len, sa; |
1da177e4 | 1157 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1158 | int k, length; |
1da177e4 LT |
1159 | |
1160 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
a13ff0bb | 1161 | return VM_FAULT_SIGBUS; |
1da177e4 | 1162 | rsv_schp = &sfp->reserve; |
a13ff0bb | 1163 | offset = vmf->pgoff << PAGE_SHIFT; |
1da177e4 | 1164 | if (offset >= rsv_schp->bufflen) |
a13ff0bb NP |
1165 | return VM_FAULT_SIGBUS; |
1166 | SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", | |
1da177e4 | 1167 | offset, rsv_schp->k_use_sg)); |
d6b10348 | 1168 | sa = vma->vm_start; |
10db10d1 FT |
1169 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1170 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1171 | len = vma->vm_end - sa; |
10db10d1 | 1172 | len = (len < length) ? len : length; |
d6b10348 | 1173 | if (offset < len) { |
10db10d1 FT |
1174 | struct page *page = nth_page(rsv_schp->pages[k], |
1175 | offset >> PAGE_SHIFT); | |
d6b10348 | 1176 | get_page(page); /* increment page count */ |
a13ff0bb NP |
1177 | vmf->page = page; |
1178 | return 0; /* success */ | |
1da177e4 | 1179 | } |
d6b10348 MC |
1180 | sa += len; |
1181 | offset -= len; | |
1da177e4 | 1182 | } |
d6b10348 | 1183 | |
a13ff0bb | 1184 | return VM_FAULT_SIGBUS; |
1da177e4 LT |
1185 | } |
1186 | ||
f0f37e2f | 1187 | static const struct vm_operations_struct sg_mmap_vm_ops = { |
a13ff0bb | 1188 | .fault = sg_vma_fault, |
1da177e4 LT |
1189 | }; |
1190 | ||
1191 | static int | |
1192 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1193 | { | |
1194 | Sg_fd *sfp; | |
d6b10348 | 1195 | unsigned long req_sz, len, sa; |
1da177e4 | 1196 | Sg_scatter_hold *rsv_schp; |
10db10d1 | 1197 | int k, length; |
1da177e4 LT |
1198 | |
1199 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1200 | return -ENXIO; | |
cb59e840 | 1201 | req_sz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
1202 | SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", |
1203 | (void *) vma->vm_start, (int) req_sz)); | |
1204 | if (vma->vm_pgoff) | |
1205 | return -EINVAL; /* want no offset */ | |
1206 | rsv_schp = &sfp->reserve; | |
1207 | if (req_sz > rsv_schp->bufflen) | |
1208 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1209 | ||
d6b10348 | 1210 | sa = vma->vm_start; |
10db10d1 FT |
1211 | length = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1212 | for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { | |
d6b10348 | 1213 | len = vma->vm_end - sa; |
10db10d1 | 1214 | len = (len < length) ? len : length; |
d6b10348 | 1215 | sa += len; |
1da177e4 | 1216 | } |
d6b10348 | 1217 | |
f9aed0e2 | 1218 | sfp->mmap_called = 1; |
1c8e71d7 | 1219 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
1220 | vma->vm_private_data = sfp; |
1221 | vma->vm_ops = &sg_mmap_vm_ops; | |
1222 | return 0; | |
1223 | } | |
1224 | ||
c96952ed FT |
1225 | static void sg_rq_end_io_usercontext(struct work_struct *work) |
1226 | { | |
1227 | struct sg_request *srp = container_of(work, struct sg_request, ew.work); | |
1228 | struct sg_fd *sfp = srp->parentfp; | |
1229 | ||
1230 | sg_finish_rem_req(srp); | |
1231 | kref_put(&sfp->f_ref, sg_remove_sfp); | |
1232 | } | |
1233 | ||
a91a3a20 FT |
1234 | /* |
1235 | * This function is a "bottom half" handler that is called by the mid | |
1236 | * level when a command is completed (or has failed). | |
1237 | */ | |
1238 | static void sg_rq_end_io(struct request *rq, int uptodate) | |
1da177e4 | 1239 | { |
a91a3a20 | 1240 | struct sg_request *srp = rq->end_io_data; |
c6517b79 | 1241 | Sg_device *sdp; |
1da177e4 | 1242 | Sg_fd *sfp; |
1da177e4 | 1243 | unsigned long iflags; |
cb59e840 | 1244 | unsigned int ms; |
a91a3a20 | 1245 | char *sense; |
c6517b79 | 1246 | int result, resid, done = 1; |
1da177e4 | 1247 | |
c6517b79 | 1248 | if (WARN_ON(srp->done != 0)) |
1da177e4 | 1249 | return; |
c6517b79 | 1250 | |
1da177e4 | 1251 | sfp = srp->parentfp; |
c6517b79 | 1252 | if (WARN_ON(sfp == NULL)) |
1da177e4 | 1253 | return; |
c6517b79 TB |
1254 | |
1255 | sdp = sfp->parentdp; | |
1256 | if (unlikely(sdp->detached)) | |
1257 | printk(KERN_INFO "sg_rq_end_io: device detached\n"); | |
1da177e4 | 1258 | |
a91a3a20 FT |
1259 | sense = rq->sense; |
1260 | result = rq->errors; | |
c3a4d78c | 1261 | resid = rq->resid_len; |
1da177e4 LT |
1262 | |
1263 | SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", | |
d6b10348 MC |
1264 | sdp->disk->disk_name, srp->header.pack_id, result)); |
1265 | srp->header.resid = resid; | |
cb59e840 | 1266 | ms = jiffies_to_msecs(jiffies); |
1267 | srp->header.duration = (ms > srp->header.duration) ? | |
1268 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1269 | if (0 != result) { |
1da177e4 LT |
1270 | struct scsi_sense_hdr sshdr; |
1271 | ||
d6b10348 MC |
1272 | srp->header.status = 0xff & result; |
1273 | srp->header.masked_status = status_byte(result); | |
1274 | srp->header.msg_status = msg_byte(result); | |
1275 | srp->header.host_status = host_byte(result); | |
1276 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1277 | if ((sdp->sgdebug > 0) && |
1278 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1279 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d6b10348 MC |
1280 | __scsi_print_sense("sg_cmd_done", sense, |
1281 | SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
1282 | |
1283 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1284 | if (driver_byte(result) != 0 |
1285 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1286 | && !scsi_sense_is_deferred(&sshdr) |
1287 | && sshdr.sense_key == UNIT_ATTENTION | |
1288 | && sdp->device->removable) { | |
1289 | /* Detected possible disc change. Set the bit - this */ | |
1290 | /* may be used if there are filesystems using this device */ | |
1291 | sdp->device->changed = 1; | |
1292 | } | |
1293 | } | |
1294 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1295 | ||
c6517b79 TB |
1296 | write_lock_irqsave(&sfp->rq_list_lock, iflags); |
1297 | if (unlikely(srp->orphan)) { | |
1da177e4 LT |
1298 | if (sfp->keep_orphan) |
1299 | srp->sg_io_owned = 0; | |
c6517b79 TB |
1300 | else |
1301 | done = 0; | |
1da177e4 | 1302 | } |
c6517b79 TB |
1303 | srp->done = done; |
1304 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1305 | ||
1306 | if (likely(done)) { | |
1307 | /* Now wake up any sg_read() that is waiting for this | |
1308 | * packet. | |
1309 | */ | |
1da177e4 | 1310 | wake_up_interruptible(&sfp->read_wait); |
c6517b79 | 1311 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); |
c96952ed | 1312 | kref_put(&sfp->f_ref, sg_remove_sfp); |
015640ed FT |
1313 | } else { |
1314 | INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); | |
1315 | schedule_work(&srp->ew.work); | |
1316 | } | |
1da177e4 LT |
1317 | } |
1318 | ||
828c0950 | 1319 | static const struct file_operations sg_fops = { |
1da177e4 LT |
1320 | .owner = THIS_MODULE, |
1321 | .read = sg_read, | |
1322 | .write = sg_write, | |
1323 | .poll = sg_poll, | |
1324 | .ioctl = sg_ioctl, | |
1325 | #ifdef CONFIG_COMPAT | |
1326 | .compat_ioctl = sg_compat_ioctl, | |
1327 | #endif | |
1328 | .open = sg_open, | |
1329 | .mmap = sg_mmap, | |
1330 | .release = sg_release, | |
1331 | .fasync = sg_fasync, | |
1332 | }; | |
1333 | ||
d253878b | 1334 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1335 | |
1336 | static int sg_sysfs_valid = 0; | |
1337 | ||
7c07d613 | 1338 | static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) |
1da177e4 | 1339 | { |
d6b10348 | 1340 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1341 | Sg_device *sdp; |
1342 | unsigned long iflags; | |
7c07d613 JB |
1343 | int error; |
1344 | u32 k; | |
1da177e4 | 1345 | |
24669f75 | 1346 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
1da177e4 LT |
1347 | if (!sdp) { |
1348 | printk(KERN_WARNING "kmalloc Sg_device failure\n"); | |
7c07d613 JB |
1349 | return ERR_PTR(-ENOMEM); |
1350 | } | |
c6517b79 | 1351 | |
7c07d613 JB |
1352 | if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { |
1353 | printk(KERN_WARNING "idr expansion Sg_device failure\n"); | |
c6517b79 | 1354 | error = -ENOMEM; |
7c07d613 | 1355 | goto out; |
1da177e4 LT |
1356 | } |
1357 | ||
7c07d613 | 1358 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 | 1359 | |
c6517b79 | 1360 | error = idr_get_new(&sg_index_idr, sdp, &k); |
7c07d613 | 1361 | if (error) { |
c6517b79 | 1362 | write_unlock_irqrestore(&sg_index_lock, iflags); |
7c07d613 JB |
1363 | printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", |
1364 | error); | |
1365 | goto out; | |
1da177e4 LT |
1366 | } |
1367 | ||
1da177e4 LT |
1368 | if (unlikely(k >= SG_MAX_DEVS)) |
1369 | goto overflow; | |
1370 | ||
1da177e4 LT |
1371 | SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); |
1372 | sprintf(disk->disk_name, "sg%d", k); | |
1373 | disk->first_minor = k; | |
1374 | sdp->disk = disk; | |
1375 | sdp->device = scsidp; | |
3442f802 | 1376 | INIT_LIST_HEAD(&sdp->sfds); |
1da177e4 | 1377 | init_waitqueue_head(&sdp->o_excl_wait); |
8a78362c | 1378 | sdp->sg_tablesize = queue_max_segments(q); |
7c07d613 | 1379 | sdp->index = k; |
c6517b79 TB |
1380 | kref_init(&sdp->d_ref); |
1381 | ||
1382 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 | 1383 | |
7c07d613 | 1384 | error = 0; |
1da177e4 | 1385 | out: |
7c07d613 | 1386 | if (error) { |
1da177e4 | 1387 | kfree(sdp); |
7c07d613 JB |
1388 | return ERR_PTR(error); |
1389 | } | |
1390 | return sdp; | |
1da177e4 LT |
1391 | |
1392 | overflow: | |
c6517b79 TB |
1393 | idr_remove(&sg_index_idr, k); |
1394 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
9ccfc756 JB |
1395 | sdev_printk(KERN_WARNING, scsidp, |
1396 | "Unable to attach sg device type=%d, minor " | |
1397 | "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); | |
1da177e4 LT |
1398 | error = -ENODEV; |
1399 | goto out; | |
1400 | } | |
1401 | ||
1402 | static int | |
ee959b00 | 1403 | sg_add(struct device *cl_dev, struct class_interface *cl_intf) |
1da177e4 | 1404 | { |
ee959b00 | 1405 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1da177e4 LT |
1406 | struct gendisk *disk; |
1407 | Sg_device *sdp = NULL; | |
1408 | struct cdev * cdev = NULL; | |
7c07d613 | 1409 | int error; |
454e8957 | 1410 | unsigned long iflags; |
1da177e4 LT |
1411 | |
1412 | disk = alloc_disk(1); | |
1413 | if (!disk) { | |
1414 | printk(KERN_WARNING "alloc_disk failed\n"); | |
1415 | return -ENOMEM; | |
1416 | } | |
1417 | disk->major = SCSI_GENERIC_MAJOR; | |
1418 | ||
1419 | error = -ENOMEM; | |
1420 | cdev = cdev_alloc(); | |
1421 | if (!cdev) { | |
1422 | printk(KERN_WARNING "cdev_alloc failed\n"); | |
1423 | goto out; | |
1424 | } | |
1425 | cdev->owner = THIS_MODULE; | |
1426 | cdev->ops = &sg_fops; | |
1427 | ||
7c07d613 JB |
1428 | sdp = sg_alloc(disk, scsidp); |
1429 | if (IS_ERR(sdp)) { | |
1da177e4 | 1430 | printk(KERN_WARNING "sg_alloc failed\n"); |
7c07d613 | 1431 | error = PTR_ERR(sdp); |
1da177e4 LT |
1432 | goto out; |
1433 | } | |
1da177e4 | 1434 | |
7c07d613 | 1435 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
5e3c34c1 | 1436 | if (error) |
454e8957 | 1437 | goto cdev_add_err; |
5e3c34c1 | 1438 | |
1da177e4 LT |
1439 | sdp->cdev = cdev; |
1440 | if (sg_sysfs_valid) { | |
ee959b00 | 1441 | struct device *sg_class_member; |
1da177e4 | 1442 | |
d73a1a67 GKH |
1443 | sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, |
1444 | MKDEV(SCSI_GENERIC_MAJOR, | |
1445 | sdp->index), | |
1446 | sdp, "%s", disk->disk_name); | |
d07e0361 FT |
1447 | if (IS_ERR(sg_class_member)) { |
1448 | printk(KERN_ERR "sg_add: " | |
ee959b00 | 1449 | "device_create failed\n"); |
d07e0361 FT |
1450 | error = PTR_ERR(sg_class_member); |
1451 | goto cdev_add_err; | |
1452 | } | |
d07e0361 | 1453 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
1da177e4 LT |
1454 | &sg_class_member->kobj, "generic"); |
1455 | if (error) | |
1456 | printk(KERN_ERR "sg_add: unable to make symlink " | |
7c07d613 | 1457 | "'generic' back to sg%d\n", sdp->index); |
1da177e4 | 1458 | } else |
7c07d613 | 1459 | printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); |
1da177e4 | 1460 | |
9ccfc756 | 1461 | sdev_printk(KERN_NOTICE, scsidp, |
7c07d613 JB |
1462 | "Attached scsi generic sg%d type %d\n", sdp->index, |
1463 | scsidp->type); | |
1da177e4 | 1464 | |
ee959b00 | 1465 | dev_set_drvdata(cl_dev, sdp); |
a24484f2 | 1466 | |
1da177e4 LT |
1467 | return 0; |
1468 | ||
454e8957 | 1469 | cdev_add_err: |
7c07d613 JB |
1470 | write_lock_irqsave(&sg_index_lock, iflags); |
1471 | idr_remove(&sg_index_idr, sdp->index); | |
1472 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1473 | kfree(sdp); | |
454e8957 | 1474 | |
1da177e4 LT |
1475 | out: |
1476 | put_disk(disk); | |
1477 | if (cdev) | |
1478 | cdev_del(cdev); | |
1479 | return error; | |
1480 | } | |
1481 | ||
c6517b79 TB |
1482 | static void sg_device_destroy(struct kref *kref) |
1483 | { | |
1484 | struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); | |
1485 | unsigned long flags; | |
1486 | ||
1487 | /* CAUTION! Note that the device can still be found via idr_find() | |
1488 | * even though the refcount is 0. Therefore, do idr_remove() BEFORE | |
1489 | * any other cleanup. | |
1490 | */ | |
1491 | ||
1492 | write_lock_irqsave(&sg_index_lock, flags); | |
1493 | idr_remove(&sg_index_idr, sdp->index); | |
1494 | write_unlock_irqrestore(&sg_index_lock, flags); | |
1495 | ||
1496 | SCSI_LOG_TIMEOUT(3, | |
1497 | printk("sg_device_destroy: %s\n", | |
1498 | sdp->disk->disk_name)); | |
1499 | ||
1500 | put_disk(sdp->disk); | |
1501 | kfree(sdp); | |
1502 | } | |
1503 | ||
1504 | static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) | |
1da177e4 | 1505 | { |
ee959b00 TJ |
1506 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1507 | Sg_device *sdp = dev_get_drvdata(cl_dev); | |
1da177e4 LT |
1508 | unsigned long iflags; |
1509 | Sg_fd *sfp; | |
1da177e4 | 1510 | |
c6517b79 | 1511 | if (!sdp || sdp->detached) |
1da177e4 | 1512 | return; |
7c07d613 | 1513 | |
c6517b79 TB |
1514 | SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); |
1515 | ||
1516 | /* Need a write lock to set sdp->detached. */ | |
7c07d613 | 1517 | write_lock_irqsave(&sg_index_lock, iflags); |
c6517b79 | 1518 | sdp->detached = 1; |
3442f802 | 1519 | list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { |
c6517b79 TB |
1520 | wake_up_interruptible(&sfp->read_wait); |
1521 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); | |
7c07d613 JB |
1522 | } |
1523 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1524 | ||
1525 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
ee959b00 | 1526 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
7c07d613 JB |
1527 | cdev_del(sdp->cdev); |
1528 | sdp->cdev = NULL; | |
1da177e4 | 1529 | |
c6517b79 | 1530 | sg_put_dev(sdp); |
1da177e4 LT |
1531 | } |
1532 | ||
6460e75a DG |
1533 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
1534 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1535 | S_IRUGO | S_IWUSR); | |
1da177e4 LT |
1536 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
1537 | ||
1538 | MODULE_AUTHOR("Douglas Gilbert"); | |
1539 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1540 | MODULE_LICENSE("GPL"); | |
1541 | MODULE_VERSION(SG_VERSION_STR); | |
f018fa55 | 1542 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
1da177e4 | 1543 | |
6460e75a DG |
1544 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
1545 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1da177e4 LT |
1546 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
1547 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1548 | ||
1549 | static int __init | |
1550 | init_sg(void) | |
1551 | { | |
1552 | int rc; | |
1553 | ||
6460e75a DG |
1554 | if (scatter_elem_sz < PAGE_SIZE) { |
1555 | scatter_elem_sz = PAGE_SIZE; | |
1556 | scatter_elem_sz_prev = scatter_elem_sz; | |
1557 | } | |
1da177e4 LT |
1558 | if (def_reserved_size >= 0) |
1559 | sg_big_buff = def_reserved_size; | |
6460e75a DG |
1560 | else |
1561 | def_reserved_size = sg_big_buff; | |
1da177e4 LT |
1562 | |
1563 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1564 | SG_MAX_DEVS, "sg"); | |
1565 | if (rc) | |
1566 | return rc; | |
d253878b | 1567 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1568 | if ( IS_ERR(sg_sysfs_class) ) { |
1569 | rc = PTR_ERR(sg_sysfs_class); | |
1570 | goto err_out; | |
1571 | } | |
1572 | sg_sysfs_valid = 1; | |
1573 | rc = scsi_register_interface(&sg_interface); | |
1574 | if (0 == rc) { | |
1575 | #ifdef CONFIG_SCSI_PROC_FS | |
1576 | sg_proc_init(); | |
1577 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1578 | return 0; | |
1579 | } | |
d253878b | 1580 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1581 | err_out: |
1582 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1583 | return rc; | |
1584 | } | |
1585 | ||
1586 | static void __exit | |
1587 | exit_sg(void) | |
1588 | { | |
1589 | #ifdef CONFIG_SCSI_PROC_FS | |
1590 | sg_proc_cleanup(); | |
1591 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1592 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1593 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1594 | sg_sysfs_valid = 0; |
1595 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1596 | SG_MAX_DEVS); | |
7c07d613 | 1597 | idr_destroy(&sg_index_idr); |
1da177e4 LT |
1598 | } |
1599 | ||
44c7b0ea | 1600 | static int sg_start_req(Sg_request *srp, unsigned char *cmd) |
10865dfa | 1601 | { |
626710c9 | 1602 | int res; |
10865dfa | 1603 | struct request *rq; |
44c7b0ea FT |
1604 | Sg_fd *sfp = srp->parentfp; |
1605 | sg_io_hdr_t *hp = &srp->header; | |
1606 | int dxfer_len = (int) hp->dxfer_len; | |
1607 | int dxfer_dir = hp->dxfer_direction; | |
626710c9 | 1608 | unsigned int iov_count = hp->iovec_count; |
44c7b0ea FT |
1609 | Sg_scatter_hold *req_schp = &srp->data; |
1610 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1611 | struct request_queue *q = sfp->parentdp->device->request_queue; | |
626710c9 | 1612 | struct rq_map_data *md, map_data; |
10865dfa FT |
1613 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; |
1614 | ||
44c7b0ea FT |
1615 | SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", |
1616 | dxfer_len)); | |
1617 | ||
10865dfa FT |
1618 | rq = blk_get_request(q, rw, GFP_ATOMIC); |
1619 | if (!rq) | |
1620 | return -ENOMEM; | |
1621 | ||
1622 | memcpy(rq->cmd, cmd, hp->cmd_len); | |
1623 | ||
1624 | rq->cmd_len = hp->cmd_len; | |
1625 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
1626 | ||
1627 | srp->rq = rq; | |
1628 | rq->end_io_data = srp; | |
1629 | rq->sense = srp->sense_b; | |
1630 | rq->retries = SG_DEFAULT_RETRIES; | |
1631 | ||
1da177e4 | 1632 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
10db10d1 | 1633 | return 0; |
10865dfa | 1634 | |
626710c9 FT |
1635 | if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && |
1636 | dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && | |
1637 | !sfp->parentdp->device->host->unchecked_isa_dma && | |
01cfcddd | 1638 | blk_rq_aligned(q, hp->dxferp, dxfer_len)) |
626710c9 FT |
1639 | md = NULL; |
1640 | else | |
1641 | md = &map_data; | |
1642 | ||
1643 | if (md) { | |
1644 | if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) | |
1645 | sg_link_reserve(sfp, srp, dxfer_len); | |
1646 | else { | |
1647 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1648 | if (res) | |
1649 | return res; | |
1650 | } | |
7e56cb0f | 1651 | |
626710c9 FT |
1652 | md->pages = req_schp->pages; |
1653 | md->page_order = req_schp->page_order; | |
1654 | md->nr_entries = req_schp->k_use_sg; | |
56c451f4 | 1655 | md->offset = 0; |
97ae77a1 | 1656 | md->null_mapped = hp->dxferp ? 0 : 1; |
ecb554a8 FT |
1657 | if (dxfer_dir == SG_DXFER_TO_FROM_DEV) |
1658 | md->from_user = 1; | |
1659 | else | |
1660 | md->from_user = 0; | |
626710c9 FT |
1661 | } |
1662 | ||
0fdf96b6 FT |
1663 | if (iov_count) { |
1664 | int len, size = sizeof(struct sg_iovec) * iov_count; | |
1665 | struct iovec *iov; | |
1666 | ||
1667 | iov = kmalloc(size, GFP_ATOMIC); | |
1668 | if (!iov) | |
1669 | return -ENOMEM; | |
1670 | ||
1671 | if (copy_from_user(iov, hp->dxferp, size)) { | |
1672 | kfree(iov); | |
1673 | return -EFAULT; | |
1674 | } | |
1675 | ||
1676 | len = iov_length(iov, iov_count); | |
1677 | if (hp->dxfer_len < len) { | |
1678 | iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); | |
1679 | len = hp->dxfer_len; | |
1680 | } | |
1681 | ||
1682 | res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, | |
1683 | iov_count, | |
1684 | len, GFP_ATOMIC); | |
1685 | kfree(iov); | |
1686 | } else | |
626710c9 FT |
1687 | res = blk_rq_map_user(q, rq, md, hp->dxferp, |
1688 | hp->dxfer_len, GFP_ATOMIC); | |
10db10d1 FT |
1689 | |
1690 | if (!res) { | |
626710c9 | 1691 | srp->bio = rq->bio; |
10db10d1 | 1692 | |
626710c9 FT |
1693 | if (!md) { |
1694 | req_schp->dio_in_use = 1; | |
1695 | hp->info |= SG_INFO_DIRECT_IO; | |
1696 | } | |
1697 | } | |
10db10d1 | 1698 | return res; |
1da177e4 LT |
1699 | } |
1700 | ||
e7ee4cc0 | 1701 | static int sg_finish_rem_req(Sg_request * srp) |
1da177e4 | 1702 | { |
e7ee4cc0 FT |
1703 | int ret = 0; |
1704 | ||
1da177e4 LT |
1705 | Sg_fd *sfp = srp->parentfp; |
1706 | Sg_scatter_hold *req_schp = &srp->data; | |
1707 | ||
1708 | SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); | |
6e5a30cb FT |
1709 | if (srp->rq) { |
1710 | if (srp->bio) | |
e7ee4cc0 | 1711 | ret = blk_rq_unmap_user(srp->bio); |
10db10d1 | 1712 | |
10865dfa | 1713 | blk_put_request(srp->rq); |
6e5a30cb | 1714 | } |
10865dfa | 1715 | |
e27168f8 CS |
1716 | if (srp->res_used) |
1717 | sg_unlink_reserve(sfp, srp); | |
1718 | else | |
1719 | sg_remove_scat(req_schp); | |
1720 | ||
1da177e4 | 1721 | sg_remove_request(sfp, srp); |
e7ee4cc0 FT |
1722 | |
1723 | return ret; | |
1da177e4 LT |
1724 | } |
1725 | ||
1726 | static int | |
1727 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1728 | { | |
10db10d1 | 1729 | int sg_bufflen = tablesize * sizeof(struct page *); |
2d20eaf9 | 1730 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 1731 | |
10db10d1 FT |
1732 | schp->pages = kzalloc(sg_bufflen, gfp_flags); |
1733 | if (!schp->pages) | |
1da177e4 | 1734 | return -ENOMEM; |
1da177e4 | 1735 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1736 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1737 | } |
1738 | ||
1da177e4 LT |
1739 | static int |
1740 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1741 | { | |
10db10d1 | 1742 | int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; |
d6b10348 | 1743 | int sg_tablesize = sfp->parentdp->sg_tablesize; |
10db10d1 FT |
1744 | int blk_size = buff_size, order; |
1745 | gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; | |
1da177e4 | 1746 | |
fb119935 | 1747 | if (blk_size < 0) |
1da177e4 LT |
1748 | return -EFAULT; |
1749 | if (0 == blk_size) | |
1750 | ++blk_size; /* don't know why */ | |
b2ed6c69 FT |
1751 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ |
1752 | blk_size = ALIGN(blk_size, SG_SECTOR_SZ); | |
1da177e4 LT |
1753 | SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", |
1754 | buff_size, blk_size)); | |
d6b10348 MC |
1755 | |
1756 | /* N.B. ret_sz carried into this block ... */ | |
1757 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1758 | if (mx_sc_elems < 0) | |
1759 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1760 | ||
6460e75a DG |
1761 | num = scatter_elem_sz; |
1762 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1763 | if (num < PAGE_SIZE) { | |
1764 | scatter_elem_sz = PAGE_SIZE; | |
1765 | scatter_elem_sz_prev = PAGE_SIZE; | |
1766 | } else | |
1767 | scatter_elem_sz_prev = num; | |
1768 | } | |
10db10d1 FT |
1769 | |
1770 | if (sfp->low_dma) | |
1771 | gfp_mask |= GFP_DMA; | |
1772 | ||
1773 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1774 | gfp_mask |= __GFP_ZERO; | |
1775 | ||
1776 | order = get_order(num); | |
1777 | retry: | |
1778 | ret_sz = 1 << (PAGE_SHIFT + order); | |
1779 | ||
1780 | for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; | |
1781 | k++, rem_sz -= ret_sz) { | |
1782 | ||
6460e75a | 1783 | num = (rem_sz > scatter_elem_sz_prev) ? |
10db10d1 FT |
1784 | scatter_elem_sz_prev : rem_sz; |
1785 | ||
1786 | schp->pages[k] = alloc_pages(gfp_mask, order); | |
1787 | if (!schp->pages[k]) | |
1788 | goto out; | |
d6b10348 | 1789 | |
6460e75a DG |
1790 | if (num == scatter_elem_sz_prev) { |
1791 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1792 | scatter_elem_sz = ret_sz; | |
1793 | scatter_elem_sz_prev = ret_sz; | |
1794 | } | |
1795 | } | |
d6b10348 | 1796 | |
7ca63cb4 DG |
1797 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " |
1798 | "ret_sz=%d\n", k, num, ret_sz)); | |
d6b10348 MC |
1799 | } /* end of for loop */ |
1800 | ||
10db10d1 | 1801 | schp->page_order = order; |
d6b10348 | 1802 | schp->k_use_sg = k; |
7ca63cb4 DG |
1803 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " |
1804 | "rem_sz=%d\n", k, rem_sz)); | |
d6b10348 MC |
1805 | |
1806 | schp->bufflen = blk_size; | |
1807 | if (rem_sz > 0) /* must have failed */ | |
1808 | return -ENOMEM; | |
1da177e4 | 1809 | return 0; |
10db10d1 FT |
1810 | out: |
1811 | for (i = 0; i < k; i++) | |
e71044ee | 1812 | __free_pages(schp->pages[i], order); |
10db10d1 FT |
1813 | |
1814 | if (--order >= 0) | |
1815 | goto retry; | |
1816 | ||
1817 | return -ENOMEM; | |
1da177e4 LT |
1818 | } |
1819 | ||
1da177e4 LT |
1820 | static void |
1821 | sg_remove_scat(Sg_scatter_hold * schp) | |
1822 | { | |
1823 | SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
10db10d1 | 1824 | if (schp->pages && schp->sglist_len > 0) { |
6e5a30cb | 1825 | if (!schp->dio_in_use) { |
1da177e4 LT |
1826 | int k; |
1827 | ||
10db10d1 | 1828 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { |
1da177e4 | 1829 | SCSI_LOG_TIMEOUT(5, printk( |
10db10d1 FT |
1830 | "sg_remove_scat: k=%d, pg=0x%p\n", |
1831 | k, schp->pages[k])); | |
1832 | __free_pages(schp->pages[k], schp->page_order); | |
1da177e4 | 1833 | } |
6e5a30cb | 1834 | |
10db10d1 | 1835 | kfree(schp->pages); |
1da177e4 | 1836 | } |
d6b10348 | 1837 | } |
1da177e4 LT |
1838 | memset(schp, 0, sizeof (*schp)); |
1839 | } | |
1840 | ||
1da177e4 LT |
1841 | static int |
1842 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
1843 | { | |
1844 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 1845 | int k, num; |
1da177e4 LT |
1846 | |
1847 | SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", | |
1848 | num_read_xfer)); | |
1849 | if ((!outp) || (num_read_xfer <= 0)) | |
1850 | return 0; | |
d6b10348 | 1851 | |
10db10d1 FT |
1852 | num = 1 << (PAGE_SHIFT + schp->page_order); |
1853 | for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { | |
d6b10348 | 1854 | if (num > num_read_xfer) { |
10db10d1 | 1855 | if (__copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
1856 | num_read_xfer)) |
1857 | return -EFAULT; | |
1858 | break; | |
1859 | } else { | |
10db10d1 | 1860 | if (__copy_to_user(outp, page_address(schp->pages[k]), |
d6b10348 MC |
1861 | num)) |
1862 | return -EFAULT; | |
1863 | num_read_xfer -= num; | |
1864 | if (num_read_xfer <= 0) | |
1da177e4 | 1865 | break; |
d6b10348 | 1866 | outp += num; |
1da177e4 | 1867 | } |
1da177e4 | 1868 | } |
d6b10348 | 1869 | |
1da177e4 LT |
1870 | return 0; |
1871 | } | |
1872 | ||
1873 | static void | |
1874 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
1875 | { | |
1876 | Sg_scatter_hold *schp = &sfp->reserve; | |
1877 | ||
1878 | SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); | |
1879 | do { | |
1880 | if (req_size < PAGE_SIZE) | |
1881 | req_size = PAGE_SIZE; | |
1882 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
1883 | return; | |
1884 | else | |
1885 | sg_remove_scat(schp); | |
1886 | req_size >>= 1; /* divide by 2 */ | |
1887 | } while (req_size > (PAGE_SIZE / 2)); | |
1888 | } | |
1889 | ||
1890 | static void | |
1891 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
1892 | { | |
1893 | Sg_scatter_hold *req_schp = &srp->data; | |
1894 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 | 1895 | int k, num, rem; |
1da177e4 LT |
1896 | |
1897 | srp->res_used = 1; | |
1898 | SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); | |
eca7be5e | 1899 | rem = size; |
d6b10348 | 1900 | |
10db10d1 FT |
1901 | num = 1 << (PAGE_SHIFT + rsv_schp->page_order); |
1902 | for (k = 0; k < rsv_schp->k_use_sg; k++) { | |
d6b10348 | 1903 | if (rem <= num) { |
d6b10348 MC |
1904 | req_schp->k_use_sg = k + 1; |
1905 | req_schp->sglist_len = rsv_schp->sglist_len; | |
10db10d1 | 1906 | req_schp->pages = rsv_schp->pages; |
d6b10348 MC |
1907 | |
1908 | req_schp->bufflen = size; | |
10db10d1 | 1909 | req_schp->page_order = rsv_schp->page_order; |
d6b10348 MC |
1910 | break; |
1911 | } else | |
1912 | rem -= num; | |
1da177e4 | 1913 | } |
d6b10348 MC |
1914 | |
1915 | if (k >= rsv_schp->k_use_sg) | |
1916 | SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
1917 | } |
1918 | ||
1919 | static void | |
1920 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
1921 | { | |
1922 | Sg_scatter_hold *req_schp = &srp->data; | |
1da177e4 LT |
1923 | |
1924 | SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", | |
1925 | (int) req_schp->k_use_sg)); | |
1da177e4 LT |
1926 | req_schp->k_use_sg = 0; |
1927 | req_schp->bufflen = 0; | |
10db10d1 FT |
1928 | req_schp->pages = NULL; |
1929 | req_schp->page_order = 0; | |
1da177e4 LT |
1930 | req_schp->sglist_len = 0; |
1931 | sfp->save_scat_len = 0; | |
1932 | srp->res_used = 0; | |
1933 | } | |
1934 | ||
1935 | static Sg_request * | |
1936 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
1937 | { | |
1938 | Sg_request *resp; | |
1939 | unsigned long iflags; | |
1940 | ||
1941 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1942 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
1943 | /* look for requests that are ready + not SG_IO owned */ | |
1944 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
1945 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
1946 | resp->done = 2; /* guard against other readers */ | |
1947 | break; | |
1948 | } | |
1949 | } | |
1950 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1951 | return resp; | |
1952 | } | |
1953 | ||
1da177e4 LT |
1954 | /* always adds to end of list */ |
1955 | static Sg_request * | |
1956 | sg_add_request(Sg_fd * sfp) | |
1957 | { | |
1958 | int k; | |
1959 | unsigned long iflags; | |
1960 | Sg_request *resp; | |
1961 | Sg_request *rp = sfp->req_arr; | |
1962 | ||
1963 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1964 | resp = sfp->headrp; | |
1965 | if (!resp) { | |
1966 | memset(rp, 0, sizeof (Sg_request)); | |
1967 | rp->parentfp = sfp; | |
1968 | resp = rp; | |
1969 | sfp->headrp = resp; | |
1970 | } else { | |
1971 | if (0 == sfp->cmd_q) | |
1972 | resp = NULL; /* command queuing disallowed */ | |
1973 | else { | |
1974 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
1975 | if (!rp->parentfp) | |
1976 | break; | |
1977 | } | |
1978 | if (k < SG_MAX_QUEUE) { | |
1979 | memset(rp, 0, sizeof (Sg_request)); | |
1980 | rp->parentfp = sfp; | |
1981 | while (resp->nextrp) | |
1982 | resp = resp->nextrp; | |
1983 | resp->nextrp = rp; | |
1984 | resp = rp; | |
1985 | } else | |
1986 | resp = NULL; | |
1987 | } | |
1988 | } | |
1989 | if (resp) { | |
1990 | resp->nextrp = NULL; | |
cb59e840 | 1991 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
1992 | } |
1993 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1994 | return resp; | |
1995 | } | |
1996 | ||
1997 | /* Return of 1 for found; 0 for not found */ | |
1998 | static int | |
1999 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2000 | { | |
2001 | Sg_request *prev_rp; | |
2002 | Sg_request *rp; | |
2003 | unsigned long iflags; | |
2004 | int res = 0; | |
2005 | ||
2006 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2007 | return res; | |
2008 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2009 | prev_rp = sfp->headrp; | |
2010 | if (srp == prev_rp) { | |
2011 | sfp->headrp = prev_rp->nextrp; | |
2012 | prev_rp->parentfp = NULL; | |
2013 | res = 1; | |
2014 | } else { | |
2015 | while ((rp = prev_rp->nextrp)) { | |
2016 | if (srp == rp) { | |
2017 | prev_rp->nextrp = rp->nextrp; | |
2018 | rp->parentfp = NULL; | |
2019 | res = 1; | |
2020 | break; | |
2021 | } | |
2022 | prev_rp = rp; | |
2023 | } | |
2024 | } | |
2025 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2026 | return res; | |
2027 | } | |
2028 | ||
1da177e4 LT |
2029 | static Sg_fd * |
2030 | sg_add_sfp(Sg_device * sdp, int dev) | |
2031 | { | |
2032 | Sg_fd *sfp; | |
2033 | unsigned long iflags; | |
44ec9542 | 2034 | int bufflen; |
1da177e4 | 2035 | |
d6b10348 | 2036 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 LT |
2037 | if (!sfp) |
2038 | return NULL; | |
d6b10348 | 2039 | |
1da177e4 LT |
2040 | init_waitqueue_head(&sfp->read_wait); |
2041 | rwlock_init(&sfp->rq_list_lock); | |
2042 | ||
c6517b79 | 2043 | kref_init(&sfp->f_ref); |
1da177e4 LT |
2044 | sfp->timeout = SG_DEFAULT_TIMEOUT; |
2045 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2046 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2047 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2048 | sdp->device->host->unchecked_isa_dma : 1; | |
2049 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2050 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2051 | sfp->parentdp = sdp; | |
7c07d613 | 2052 | write_lock_irqsave(&sg_index_lock, iflags); |
3442f802 | 2053 | list_add_tail(&sfp->sfd_siblings, &sdp->sfds); |
7c07d613 | 2054 | write_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 | 2055 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); |
6460e75a DG |
2056 | if (unlikely(sg_big_buff != def_reserved_size)) |
2057 | sg_big_buff = def_reserved_size; | |
2058 | ||
44ec9542 | 2059 | bufflen = min_t(int, sg_big_buff, |
ae03bf63 | 2060 | queue_max_sectors(sdp->device->request_queue) * 512); |
44ec9542 | 2061 | sg_build_reserve(sfp, bufflen); |
1da177e4 LT |
2062 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", |
2063 | sfp->reserve.bufflen, sfp->reserve.k_use_sg)); | |
c6517b79 TB |
2064 | |
2065 | kref_get(&sdp->d_ref); | |
2066 | __module_get(THIS_MODULE); | |
1da177e4 LT |
2067 | return sfp; |
2068 | } | |
2069 | ||
c6517b79 | 2070 | static void sg_remove_sfp_usercontext(struct work_struct *work) |
1da177e4 | 2071 | { |
c6517b79 TB |
2072 | struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); |
2073 | struct sg_device *sdp = sfp->parentdp; | |
2074 | ||
2075 | /* Cleanup any responses which were never read(). */ | |
2076 | while (sfp->headrp) | |
2077 | sg_finish_rem_req(sfp->headrp); | |
1da177e4 | 2078 | |
1da177e4 | 2079 | if (sfp->reserve.bufflen > 0) { |
c6517b79 TB |
2080 | SCSI_LOG_TIMEOUT(6, |
2081 | printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2082 | (int) sfp->reserve.bufflen, | |
2083 | (int) sfp->reserve.k_use_sg)); | |
1da177e4 LT |
2084 | sg_remove_scat(&sfp->reserve); |
2085 | } | |
c6517b79 TB |
2086 | |
2087 | SCSI_LOG_TIMEOUT(6, | |
2088 | printk("sg_remove_sfp: %s, sfp=0x%p\n", | |
2089 | sdp->disk->disk_name, | |
2090 | sfp)); | |
d6b10348 | 2091 | kfree(sfp); |
c6517b79 TB |
2092 | |
2093 | scsi_device_put(sdp->device); | |
2094 | sg_put_dev(sdp); | |
2095 | module_put(THIS_MODULE); | |
1da177e4 LT |
2096 | } |
2097 | ||
c6517b79 | 2098 | static void sg_remove_sfp(struct kref *kref) |
1da177e4 | 2099 | { |
c6517b79 TB |
2100 | struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); |
2101 | struct sg_device *sdp = sfp->parentdp; | |
c6517b79 | 2102 | unsigned long iflags; |
1da177e4 | 2103 | |
c6517b79 | 2104 | write_lock_irqsave(&sg_index_lock, iflags); |
3442f802 | 2105 | list_del(&sfp->sfd_siblings); |
c6517b79 TB |
2106 | write_unlock_irqrestore(&sg_index_lock, iflags); |
2107 | wake_up_interruptible(&sdp->o_excl_wait); | |
1da177e4 | 2108 | |
015640ed FT |
2109 | INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); |
2110 | schedule_work(&sfp->ew.work); | |
1da177e4 LT |
2111 | } |
2112 | ||
2113 | static int | |
2114 | sg_res_in_use(Sg_fd * sfp) | |
2115 | { | |
2116 | const Sg_request *srp; | |
2117 | unsigned long iflags; | |
2118 | ||
2119 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2120 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2121 | if (srp->res_used) | |
2122 | break; | |
2123 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2124 | return srp ? 1 : 0; | |
2125 | } | |
2126 | ||
1da177e4 | 2127 | #ifdef CONFIG_SCSI_PROC_FS |
7c07d613 JB |
2128 | static int |
2129 | sg_idr_max_id(int id, void *p, void *data) | |
2130 | { | |
2131 | int *k = data; | |
2132 | ||
2133 | if (*k < id) | |
2134 | *k = id; | |
2135 | ||
2136 | return 0; | |
2137 | } | |
2138 | ||
1da177e4 LT |
2139 | static int |
2140 | sg_last_dev(void) | |
2141 | { | |
53474c04 | 2142 | int k = -1; |
1da177e4 LT |
2143 | unsigned long iflags; |
2144 | ||
7c07d613 JB |
2145 | read_lock_irqsave(&sg_index_lock, iflags); |
2146 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2147 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 LT |
2148 | return k + 1; /* origin 1 */ |
2149 | } | |
2150 | #endif | |
2151 | ||
c6517b79 TB |
2152 | /* must be called with sg_index_lock held */ |
2153 | static Sg_device *sg_lookup_dev(int dev) | |
1da177e4 | 2154 | { |
c6517b79 TB |
2155 | return idr_find(&sg_index_idr, dev); |
2156 | } | |
1da177e4 | 2157 | |
c6517b79 TB |
2158 | static Sg_device *sg_get_dev(int dev) |
2159 | { | |
2160 | struct sg_device *sdp; | |
2161 | unsigned long flags; | |
2162 | ||
2163 | read_lock_irqsave(&sg_index_lock, flags); | |
2164 | sdp = sg_lookup_dev(dev); | |
2165 | if (!sdp) | |
2166 | sdp = ERR_PTR(-ENXIO); | |
2167 | else if (sdp->detached) { | |
2168 | /* If sdp->detached, then the refcount may already be 0, in | |
2169 | * which case it would be a bug to do kref_get(). | |
2170 | */ | |
2171 | sdp = ERR_PTR(-ENODEV); | |
2172 | } else | |
2173 | kref_get(&sdp->d_ref); | |
2174 | read_unlock_irqrestore(&sg_index_lock, flags); | |
7c07d613 | 2175 | |
1da177e4 LT |
2176 | return sdp; |
2177 | } | |
2178 | ||
c6517b79 TB |
2179 | static void sg_put_dev(struct sg_device *sdp) |
2180 | { | |
2181 | kref_put(&sdp->d_ref, sg_device_destroy); | |
2182 | } | |
2183 | ||
1da177e4 LT |
2184 | #ifdef CONFIG_SCSI_PROC_FS |
2185 | ||
2186 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2187 | ||
2188 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2189 | ||
2190 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2191 | ||
2192 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2193 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2194 | size_t count, loff_t *off); | |
828c0950 AD |
2195 | static const struct file_operations adio_fops = { |
2196 | .owner = THIS_MODULE, | |
1da177e4 | 2197 | .open = sg_proc_single_open_adio, |
828c0950 AD |
2198 | .read = seq_read, |
2199 | .llseek = seq_lseek, | |
1da177e4 LT |
2200 | .write = sg_proc_write_adio, |
2201 | .release = single_release, | |
2202 | }; | |
2203 | ||
2204 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2205 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2206 | const char __user *buffer, size_t count, loff_t *off); | |
828c0950 AD |
2207 | static const struct file_operations dressz_fops = { |
2208 | .owner = THIS_MODULE, | |
1da177e4 | 2209 | .open = sg_proc_single_open_dressz, |
828c0950 AD |
2210 | .read = seq_read, |
2211 | .llseek = seq_lseek, | |
1da177e4 LT |
2212 | .write = sg_proc_write_dressz, |
2213 | .release = single_release, | |
2214 | }; | |
2215 | ||
2216 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2217 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
828c0950 AD |
2218 | static const struct file_operations version_fops = { |
2219 | .owner = THIS_MODULE, | |
1da177e4 | 2220 | .open = sg_proc_single_open_version, |
828c0950 AD |
2221 | .read = seq_read, |
2222 | .llseek = seq_lseek, | |
1da177e4 LT |
2223 | .release = single_release, |
2224 | }; | |
2225 | ||
2226 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2227 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
828c0950 AD |
2228 | static const struct file_operations devhdr_fops = { |
2229 | .owner = THIS_MODULE, | |
1da177e4 | 2230 | .open = sg_proc_single_open_devhdr, |
828c0950 AD |
2231 | .read = seq_read, |
2232 | .llseek = seq_lseek, | |
1da177e4 LT |
2233 | .release = single_release, |
2234 | }; | |
2235 | ||
2236 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2237 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2238 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2239 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2240 | static void dev_seq_stop(struct seq_file *s, void *v); | |
828c0950 AD |
2241 | static const struct file_operations dev_fops = { |
2242 | .owner = THIS_MODULE, | |
1da177e4 | 2243 | .open = sg_proc_open_dev, |
828c0950 AD |
2244 | .read = seq_read, |
2245 | .llseek = seq_lseek, | |
1da177e4 LT |
2246 | .release = seq_release, |
2247 | }; | |
88e9d34c | 2248 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
2249 | .start = dev_seq_start, |
2250 | .next = dev_seq_next, | |
2251 | .stop = dev_seq_stop, | |
2252 | .show = sg_proc_seq_show_dev, | |
2253 | }; | |
2254 | ||
2255 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2256 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
828c0950 AD |
2257 | static const struct file_operations devstrs_fops = { |
2258 | .owner = THIS_MODULE, | |
1da177e4 | 2259 | .open = sg_proc_open_devstrs, |
828c0950 AD |
2260 | .read = seq_read, |
2261 | .llseek = seq_lseek, | |
1da177e4 LT |
2262 | .release = seq_release, |
2263 | }; | |
88e9d34c | 2264 | static const struct seq_operations devstrs_seq_ops = { |
1da177e4 LT |
2265 | .start = dev_seq_start, |
2266 | .next = dev_seq_next, | |
2267 | .stop = dev_seq_stop, | |
2268 | .show = sg_proc_seq_show_devstrs, | |
2269 | }; | |
2270 | ||
2271 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2272 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
828c0950 AD |
2273 | static const struct file_operations debug_fops = { |
2274 | .owner = THIS_MODULE, | |
1da177e4 | 2275 | .open = sg_proc_open_debug, |
828c0950 AD |
2276 | .read = seq_read, |
2277 | .llseek = seq_lseek, | |
1da177e4 LT |
2278 | .release = seq_release, |
2279 | }; | |
88e9d34c | 2280 | static const struct seq_operations debug_seq_ops = { |
1da177e4 LT |
2281 | .start = dev_seq_start, |
2282 | .next = dev_seq_next, | |
2283 | .stop = dev_seq_stop, | |
2284 | .show = sg_proc_seq_show_debug, | |
2285 | }; | |
2286 | ||
2287 | ||
2288 | struct sg_proc_leaf { | |
2289 | const char * name; | |
828c0950 | 2290 | const struct file_operations * fops; |
1da177e4 LT |
2291 | }; |
2292 | ||
2293 | static struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2294 | {"allow_dio", &adio_fops}, | |
2295 | {"debug", &debug_fops}, | |
2296 | {"def_reserved_size", &dressz_fops}, | |
2297 | {"device_hdr", &devhdr_fops}, | |
2298 | {"devices", &dev_fops}, | |
2299 | {"device_strs", &devstrs_fops}, | |
2300 | {"version", &version_fops} | |
2301 | }; | |
2302 | ||
2303 | static int | |
2304 | sg_proc_init(void) | |
2305 | { | |
2306 | int k, mask; | |
6391a113 | 2307 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2308 | struct sg_proc_leaf * leaf; |
2309 | ||
66600221 | 2310 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2311 | if (!sg_proc_sgp) |
2312 | return 1; | |
2313 | for (k = 0; k < num_leaves; ++k) { | |
2314 | leaf = &sg_proc_leaf_arr[k]; | |
2315 | mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
a973909f | 2316 | proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); |
1da177e4 LT |
2317 | } |
2318 | return 0; | |
2319 | } | |
2320 | ||
2321 | static void | |
2322 | sg_proc_cleanup(void) | |
2323 | { | |
2324 | int k; | |
6391a113 | 2325 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2326 | |
2327 | if (!sg_proc_sgp) | |
2328 | return; | |
2329 | for (k = 0; k < num_leaves; ++k) | |
2330 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2331 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2332 | } | |
2333 | ||
2334 | ||
2335 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2336 | { | |
2337 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2338 | return 0; | |
2339 | } | |
2340 | ||
2341 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2342 | { | |
2343 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2344 | } | |
2345 | ||
2346 | static ssize_t | |
2347 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2348 | size_t count, loff_t *off) | |
2349 | { | |
2350 | int num; | |
2351 | char buff[11]; | |
2352 | ||
2353 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2354 | return -EACCES; | |
2355 | num = (count < 10) ? count : 10; | |
2356 | if (copy_from_user(buff, buffer, num)) | |
2357 | return -EFAULT; | |
2358 | buff[num] = '\0'; | |
2359 | sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; | |
2360 | return count; | |
2361 | } | |
2362 | ||
2363 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2364 | { | |
2365 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2366 | } | |
2367 | ||
2368 | static ssize_t | |
2369 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2370 | size_t count, loff_t *off) | |
2371 | { | |
2372 | int num; | |
2373 | unsigned long k = ULONG_MAX; | |
2374 | char buff[11]; | |
2375 | ||
2376 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2377 | return -EACCES; | |
2378 | num = (count < 10) ? count : 10; | |
2379 | if (copy_from_user(buff, buffer, num)) | |
2380 | return -EFAULT; | |
2381 | buff[num] = '\0'; | |
2382 | k = simple_strtoul(buff, NULL, 10); | |
2383 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2384 | sg_big_buff = k; | |
2385 | return count; | |
2386 | } | |
2387 | return -ERANGE; | |
2388 | } | |
2389 | ||
2390 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2391 | { | |
2392 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2393 | sg_version_date); | |
2394 | return 0; | |
2395 | } | |
2396 | ||
2397 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2398 | { | |
2399 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2400 | } | |
2401 | ||
2402 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2403 | { | |
2404 | seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" | |
2405 | "online\n"); | |
2406 | return 0; | |
2407 | } | |
2408 | ||
2409 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2410 | { | |
2411 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2412 | } | |
2413 | ||
2414 | struct sg_proc_deviter { | |
2415 | loff_t index; | |
2416 | size_t max; | |
2417 | }; | |
2418 | ||
2419 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2420 | { | |
2421 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2422 | ||
729d70f5 | 2423 | s->private = it; |
1da177e4 LT |
2424 | if (! it) |
2425 | return NULL; | |
729d70f5 | 2426 | |
1da177e4 LT |
2427 | it->index = *pos; |
2428 | it->max = sg_last_dev(); | |
2429 | if (it->index >= it->max) | |
729d70f5 | 2430 | return NULL; |
1da177e4 | 2431 | return it; |
1da177e4 LT |
2432 | } |
2433 | ||
2434 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2435 | { | |
729d70f5 | 2436 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2437 | |
2438 | *pos = ++it->index; | |
2439 | return (it->index < it->max) ? it : NULL; | |
2440 | } | |
2441 | ||
2442 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2443 | { | |
729d70f5 | 2444 | kfree(s->private); |
1da177e4 LT |
2445 | } |
2446 | ||
2447 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2448 | { | |
2449 | return seq_open(file, &dev_seq_ops); | |
2450 | } | |
2451 | ||
2452 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2453 | { | |
2454 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2455 | Sg_device *sdp; | |
2456 | struct scsi_device *scsidp; | |
c6517b79 | 2457 | unsigned long iflags; |
1da177e4 | 2458 | |
c6517b79 TB |
2459 | read_lock_irqsave(&sg_index_lock, iflags); |
2460 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
1da177e4 LT |
2461 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) |
2462 | seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", | |
2463 | scsidp->host->host_no, scsidp->channel, | |
2464 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2465 | 1, | |
2466 | (int) scsidp->queue_depth, | |
2467 | (int) scsidp->device_busy, | |
2468 | (int) scsi_device_online(scsidp)); | |
2469 | else | |
2470 | seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
c6517b79 | 2471 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2472 | return 0; |
2473 | } | |
2474 | ||
2475 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
2476 | { | |
2477 | return seq_open(file, &devstrs_seq_ops); | |
2478 | } | |
2479 | ||
2480 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
2481 | { | |
2482 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2483 | Sg_device *sdp; | |
2484 | struct scsi_device *scsidp; | |
c6517b79 | 2485 | unsigned long iflags; |
1da177e4 | 2486 | |
c6517b79 TB |
2487 | read_lock_irqsave(&sg_index_lock, iflags); |
2488 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
1da177e4 LT |
2489 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) |
2490 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
2491 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2492 | else | |
2493 | seq_printf(s, "<no active device>\n"); | |
c6517b79 | 2494 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2495 | return 0; |
2496 | } | |
2497 | ||
c6517b79 | 2498 | /* must be called while holding sg_index_lock */ |
1da177e4 LT |
2499 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) |
2500 | { | |
2501 | int k, m, new_interface, blen, usg; | |
2502 | Sg_request *srp; | |
2503 | Sg_fd *fp; | |
2504 | const sg_io_hdr_t *hp; | |
2505 | const char * cp; | |
cb59e840 | 2506 | unsigned int ms; |
1da177e4 | 2507 | |
3442f802 FT |
2508 | k = 0; |
2509 | list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { | |
2510 | k++; | |
c6517b79 | 2511 | read_lock(&fp->rq_list_lock); /* irqs already disabled */ |
1da177e4 | 2512 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " |
3442f802 | 2513 | "(res)sgat=%d low_dma=%d\n", k, |
1da177e4 LT |
2514 | jiffies_to_msecs(fp->timeout), |
2515 | fp->reserve.bufflen, | |
2516 | (int) fp->reserve.k_use_sg, | |
2517 | (int) fp->low_dma); | |
2518 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", | |
2519 | (int) fp->cmd_q, (int) fp->force_packid, | |
2520 | (int) fp->keep_orphan, (int) fp->closed); | |
c6517b79 TB |
2521 | for (m = 0, srp = fp->headrp; |
2522 | srp != NULL; | |
2523 | ++m, srp = srp->nextrp) { | |
1da177e4 LT |
2524 | hp = &srp->header; |
2525 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2526 | if (srp->res_used) { | |
2527 | if (new_interface && | |
2528 | (SG_FLAG_MMAP_IO & hp->flags)) | |
2529 | cp = " mmap>> "; | |
2530 | else | |
2531 | cp = " rb>> "; | |
2532 | } else { | |
2533 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2534 | cp = " dio>> "; | |
2535 | else | |
2536 | cp = " "; | |
2537 | } | |
2538 | seq_printf(s, cp); | |
d6b10348 MC |
2539 | blen = srp->data.bufflen; |
2540 | usg = srp->data.k_use_sg; | |
1da177e4 LT |
2541 | seq_printf(s, srp->done ? |
2542 | ((1 == srp->done) ? "rcv:" : "fin:") | |
d6b10348 | 2543 | : "act:"); |
1da177e4 LT |
2544 | seq_printf(s, " id=%d blen=%d", |
2545 | srp->header.pack_id, blen); | |
2546 | if (srp->done) | |
2547 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 | 2548 | else { |
2549 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2550 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 | 2551 | (new_interface ? hp->timeout : |
2552 | jiffies_to_msecs(fp->timeout)), | |
2553 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2554 | } | |
1da177e4 LT |
2555 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2556 | (int) srp->data.cmd_opcode); | |
2557 | } | |
2558 | if (0 == m) | |
2559 | seq_printf(s, " No requests active\n"); | |
c6517b79 | 2560 | read_unlock(&fp->rq_list_lock); |
1da177e4 LT |
2561 | } |
2562 | } | |
2563 | ||
2564 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
2565 | { | |
2566 | return seq_open(file, &debug_seq_ops); | |
2567 | } | |
2568 | ||
2569 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
2570 | { | |
2571 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2572 | Sg_device *sdp; | |
c6517b79 | 2573 | unsigned long iflags; |
1da177e4 LT |
2574 | |
2575 | if (it && (0 == it->index)) { | |
7c07d613 JB |
2576 | seq_printf(s, "max_active_device=%d(origin 1)\n", |
2577 | (int)it->max); | |
1da177e4 LT |
2578 | seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); |
2579 | } | |
1da177e4 | 2580 | |
c6517b79 TB |
2581 | read_lock_irqsave(&sg_index_lock, iflags); |
2582 | sdp = it ? sg_lookup_dev(it->index) : NULL; | |
3442f802 | 2583 | if (sdp && !list_empty(&sdp->sfds)) { |
c6517b79 | 2584 | struct scsi_device *scsidp = sdp->device; |
1da177e4 | 2585 | |
c6517b79 TB |
2586 | seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); |
2587 | if (sdp->detached) | |
2588 | seq_printf(s, "detached pending close "); | |
2589 | else | |
2590 | seq_printf | |
2591 | (s, "scsi%d chan=%d id=%d lun=%d em=%d", | |
2592 | scsidp->host->host_no, | |
2593 | scsidp->channel, scsidp->id, | |
2594 | scsidp->lun, | |
2595 | scsidp->host->hostt->emulated); | |
2596 | seq_printf(s, " sg_tablesize=%d excl=%d\n", | |
2597 | sdp->sg_tablesize, sdp->exclude); | |
1da177e4 LT |
2598 | sg_proc_debug_helper(s, sdp); |
2599 | } | |
c6517b79 | 2600 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2601 | return 0; |
2602 | } | |
2603 | ||
2604 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2605 | ||
2606 | module_init(init_sg); | |
2607 | module_exit(exit_sg); |