]>
Commit | Line | Data |
---|---|---|
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> | |
378f058c | 50 | #include <linux/scatterlist.h> |
6da127ad | 51 | #include <linux/blktrace_api.h> |
eb09d3d4 | 52 | #include <linux/smp_lock.h> |
1da177e4 LT |
53 | |
54 | #include "scsi.h" | |
db9dff36 | 55 | #include <scsi/scsi_dbg.h> |
1da177e4 LT |
56 | #include <scsi/scsi_host.h> |
57 | #include <scsi/scsi_driver.h> | |
58 | #include <scsi/scsi_ioctl.h> | |
59 | #include <scsi/sg.h> | |
60 | ||
61 | #include "scsi_logging.h" | |
62 | ||
63 | #ifdef CONFIG_SCSI_PROC_FS | |
64 | #include <linux/proc_fs.h> | |
7ca63cb4 | 65 | static char *sg_version_date = "20061027"; |
1da177e4 LT |
66 | |
67 | static int sg_proc_init(void); | |
68 | static void sg_proc_cleanup(void); | |
69 | #endif | |
70 | ||
1da177e4 LT |
71 | #define SG_ALLOW_DIO_DEF 0 |
72 | #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ | |
73 | ||
74 | #define SG_MAX_DEVS 32768 | |
75 | ||
76 | /* | |
77 | * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) | |
78 | * Then when using 32 bit integers x * m may overflow during the calculation. | |
79 | * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m | |
80 | * calculates the same, but prevents the overflow when both m and d | |
81 | * are "small" numbers (like HZ and USER_HZ). | |
82 | * Of course an overflow is inavoidable if the result of muldiv doesn't fit | |
83 | * in 32 bits. | |
84 | */ | |
85 | #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) | |
86 | ||
87 | #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) | |
88 | ||
89 | int sg_big_buff = SG_DEF_RESERVED_SIZE; | |
90 | /* N.B. This variable is readable and writeable via | |
91 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
92 | of this size (or less if there is not enough memory) will be reserved | |
93 | for use by this file descriptor. [Deprecated usage: this variable is also | |
94 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
95 | the kernel (i.e. it is not a module).] */ | |
96 | static int def_reserved_size = -1; /* picks up init parameter */ | |
97 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
98 | ||
6460e75a DG |
99 | static int scatter_elem_sz = SG_SCATTER_SZ; |
100 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; | |
101 | ||
1da177e4 LT |
102 | #define SG_SECTOR_SZ 512 |
103 | #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) | |
104 | ||
ee959b00 TJ |
105 | static int sg_add(struct device *, struct class_interface *); |
106 | static void sg_remove(struct device *, struct class_interface *); | |
1da177e4 | 107 | |
7c07d613 JB |
108 | static DEFINE_IDR(sg_index_idr); |
109 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock | |
1da177e4 LT |
110 | file descriptor list for device */ |
111 | ||
112 | static struct class_interface sg_interface = { | |
ee959b00 TJ |
113 | .add_dev = sg_add, |
114 | .remove_dev = sg_remove, | |
1da177e4 LT |
115 | }; |
116 | ||
117 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
118 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
ea312552 | 119 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
1da177e4 LT |
120 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
121 | unsigned b_malloc_len; /* actual len malloc'ed in buffer */ | |
d6b10348 | 122 | struct scatterlist *buffer;/* scatter list */ |
1da177e4 LT |
123 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
124 | unsigned char cmd_opcode; /* first byte of command */ | |
125 | } Sg_scatter_hold; | |
126 | ||
127 | struct sg_device; /* forward declarations */ | |
128 | struct sg_fd; | |
129 | ||
130 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
1da177e4 LT |
131 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ |
132 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
133 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
134 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
d6b10348 | 135 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
1da177e4 LT |
136 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
137 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
138 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
139 | volatile char done; /* 0->before bh, 1->before read, 2->read */ | |
10865dfa | 140 | struct request *rq; |
1da177e4 LT |
141 | } Sg_request; |
142 | ||
143 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
144 | struct sg_fd *nextfp; /* NULL when last opened fd on this device */ | |
145 | struct sg_device *parentdp; /* owning device */ | |
146 | wait_queue_head_t read_wait; /* queue read until command done */ | |
147 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
148 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
149 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
150 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
151 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
152 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
153 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
154 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
155 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
156 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
157 | volatile char closed; /* 1 -> fd closed but request(s) outstanding */ | |
158 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
159 | char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ | |
160 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
161 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
162 | } Sg_fd; | |
163 | ||
164 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
165 | struct scsi_device *device; | |
166 | wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ | |
167 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
7c07d613 | 168 | u32 index; /* device index number */ |
1da177e4 LT |
169 | Sg_fd *headfp; /* first open fd belonging to this device */ |
170 | volatile char detached; /* 0->attached, 1->detached pending removal */ | |
171 | volatile char exclude; /* opened for exclusive access */ | |
172 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ | |
173 | struct gendisk *disk; | |
174 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
175 | } Sg_device; | |
176 | ||
177 | static int sg_fasync(int fd, struct file *filp, int mode); | |
d6b10348 MC |
178 | /* tasklet or soft irq callback */ |
179 | static void sg_cmd_done(void *data, char *sense, int result, int resid); | |
10865dfa | 180 | static int sg_start_req(Sg_request *srp, unsigned char *cmd); |
1da177e4 LT |
181 | static void sg_finish_rem_req(Sg_request * srp); |
182 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); | |
183 | static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, | |
184 | int tablesize); | |
185 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, | |
186 | Sg_request * srp); | |
0b07de85 AG |
187 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
188 | const char __user *buf, size_t count, int blocking, | |
189 | int read_only, Sg_request **o_srp); | |
1da177e4 LT |
190 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
191 | unsigned char *cmnd, int timeout, int blocking); | |
192 | static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
193 | int wr_xf, int *countp, unsigned char __user **up); | |
194 | static int sg_write_xfer(Sg_request * srp); | |
195 | static int sg_read_xfer(Sg_request * srp); | |
196 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); | |
197 | static void sg_remove_scat(Sg_scatter_hold * schp); | |
198 | static void sg_build_reserve(Sg_fd * sfp, int req_size); | |
199 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
200 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
d6b10348 MC |
201 | static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); |
202 | static void sg_page_free(struct page *page, int size); | |
1da177e4 LT |
203 | static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); |
204 | static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
205 | static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
206 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); | |
207 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
208 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
209 | static int sg_res_in_use(Sg_fd * sfp); | |
1da177e4 LT |
210 | static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); |
211 | static Sg_device *sg_get_dev(int dev); | |
1da177e4 LT |
212 | #ifdef CONFIG_SCSI_PROC_FS |
213 | static int sg_last_dev(void); | |
214 | #endif | |
215 | ||
1da177e4 LT |
216 | #define SZ_SG_HEADER sizeof(struct sg_header) |
217 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
218 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
219 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
220 | ||
14e507b8 FT |
221 | static int sg_allow_access(struct file *filp, unsigned char *cmd) |
222 | { | |
223 | struct sg_fd *sfp = (struct sg_fd *)filp->private_data; | |
224 | struct request_queue *q = sfp->parentdp->device->request_queue; | |
225 | ||
226 | if (sfp->parentdp->device->type == TYPE_SCANNER) | |
227 | return 0; | |
228 | ||
229 | return blk_verify_command(&q->cmd_filter, | |
230 | cmd, filp->f_mode & FMODE_WRITE); | |
231 | } | |
232 | ||
10865dfa FT |
233 | static void sg_rq_end_io(struct request *rq, int uptodate) |
234 | { | |
235 | sg_cmd_done(rq->end_io_data, rq->sense, rq->errors, rq->data_len); | |
236 | } | |
237 | ||
1da177e4 LT |
238 | static int |
239 | sg_open(struct inode *inode, struct file *filp) | |
240 | { | |
241 | int dev = iminor(inode); | |
242 | int flags = filp->f_flags; | |
d6b10348 | 243 | struct request_queue *q; |
1da177e4 LT |
244 | Sg_device *sdp; |
245 | Sg_fd *sfp; | |
246 | int res; | |
247 | int retval; | |
248 | ||
eb09d3d4 | 249 | lock_kernel(); |
1da177e4 LT |
250 | nonseekable_open(inode, filp); |
251 | SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); | |
252 | sdp = sg_get_dev(dev); | |
eb09d3d4 JC |
253 | if ((!sdp) || (!sdp->device)) { |
254 | unlock_kernel(); | |
1da177e4 | 255 | return -ENXIO; |
eb09d3d4 JC |
256 | } |
257 | if (sdp->detached) { | |
258 | unlock_kernel(); | |
1da177e4 | 259 | return -ENODEV; |
eb09d3d4 | 260 | } |
1da177e4 LT |
261 | |
262 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
263 | /* Prevent the device driver from vanishing while we sleep */ | |
264 | retval = scsi_device_get(sdp->device); | |
eb09d3d4 JC |
265 | if (retval) { |
266 | unlock_kernel(); | |
1da177e4 | 267 | return retval; |
eb09d3d4 | 268 | } |
1da177e4 LT |
269 | |
270 | if (!((flags & O_NONBLOCK) || | |
271 | scsi_block_when_processing_errors(sdp->device))) { | |
272 | retval = -ENXIO; | |
273 | /* we are in error recovery for this device */ | |
274 | goto error_out; | |
275 | } | |
276 | ||
277 | if (flags & O_EXCL) { | |
278 | if (O_RDONLY == (flags & O_ACCMODE)) { | |
279 | retval = -EPERM; /* Can't lock it with read only access */ | |
280 | goto error_out; | |
281 | } | |
282 | if (sdp->headfp && (flags & O_NONBLOCK)) { | |
283 | retval = -EBUSY; | |
284 | goto error_out; | |
285 | } | |
286 | res = 0; | |
287 | __wait_event_interruptible(sdp->o_excl_wait, | |
288 | ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); | |
289 | if (res) { | |
290 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
291 | goto error_out; | |
292 | } | |
293 | } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ | |
294 | if (flags & O_NONBLOCK) { | |
295 | retval = -EBUSY; | |
296 | goto error_out; | |
297 | } | |
298 | res = 0; | |
299 | __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), | |
300 | res); | |
301 | if (res) { | |
302 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
303 | goto error_out; | |
304 | } | |
305 | } | |
306 | if (sdp->detached) { | |
307 | retval = -ENODEV; | |
308 | goto error_out; | |
309 | } | |
310 | if (!sdp->headfp) { /* no existing opens on this device */ | |
311 | sdp->sgdebug = 0; | |
d6b10348 MC |
312 | q = sdp->device->request_queue; |
313 | sdp->sg_tablesize = min(q->max_hw_segments, | |
314 | q->max_phys_segments); | |
1da177e4 LT |
315 | } |
316 | if ((sfp = sg_add_sfp(sdp, dev))) | |
317 | filp->private_data = sfp; | |
318 | else { | |
319 | if (flags & O_EXCL) | |
320 | sdp->exclude = 0; /* undo if error */ | |
321 | retval = -ENOMEM; | |
322 | goto error_out; | |
323 | } | |
eb09d3d4 | 324 | unlock_kernel(); |
1da177e4 LT |
325 | return 0; |
326 | ||
327 | error_out: | |
328 | scsi_device_put(sdp->device); | |
eb09d3d4 | 329 | unlock_kernel(); |
1da177e4 LT |
330 | return retval; |
331 | } | |
332 | ||
333 | /* Following function was formerly called 'sg_close' */ | |
334 | static int | |
335 | sg_release(struct inode *inode, struct file *filp) | |
336 | { | |
337 | Sg_device *sdp; | |
338 | Sg_fd *sfp; | |
339 | ||
340 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
341 | return -ENXIO; | |
342 | SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); | |
343 | sg_fasync(-1, filp, 0); /* remove filp from async notification list */ | |
344 | if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ | |
345 | if (!sdp->detached) { | |
346 | scsi_device_put(sdp->device); | |
347 | } | |
348 | sdp->exclude = 0; | |
349 | wake_up_interruptible(&sdp->o_excl_wait); | |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static ssize_t | |
355 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
356 | { | |
1da177e4 LT |
357 | Sg_device *sdp; |
358 | Sg_fd *sfp; | |
359 | Sg_request *srp; | |
360 | int req_pack_id = -1; | |
1da177e4 | 361 | sg_io_hdr_t *hp; |
cb59e840 DG |
362 | struct sg_header *old_hdr = NULL; |
363 | int retval = 0; | |
1da177e4 LT |
364 | |
365 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
366 | return -ENXIO; | |
367 | SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", | |
368 | sdp->disk->disk_name, (int) count)); | |
d6b10348 | 369 | |
1da177e4 LT |
370 | if (!access_ok(VERIFY_WRITE, buf, count)) |
371 | return -EFAULT; | |
372 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 DG |
373 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
374 | if (!old_hdr) | |
375 | return -ENOMEM; | |
376 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
377 | retval = -EFAULT; | |
378 | goto free_old_hdr; | |
379 | } | |
380 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 381 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 DG |
382 | sg_io_hdr_t *new_hdr; |
383 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
384 | if (!new_hdr) { | |
385 | retval = -ENOMEM; | |
386 | goto free_old_hdr; | |
387 | } | |
388 | retval =__copy_from_user | |
389 | (new_hdr, buf, SZ_SG_IO_HDR); | |
390 | req_pack_id = new_hdr->pack_id; | |
391 | kfree(new_hdr); | |
392 | if (retval) { | |
393 | retval = -EFAULT; | |
394 | goto free_old_hdr; | |
395 | } | |
1da177e4 LT |
396 | } |
397 | } else | |
cb59e840 | 398 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
399 | } |
400 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
401 | if (!srp) { /* now wait on packet to arrive */ | |
cb59e840 DG |
402 | if (sdp->detached) { |
403 | retval = -ENODEV; | |
404 | goto free_old_hdr; | |
405 | } | |
406 | if (filp->f_flags & O_NONBLOCK) { | |
407 | retval = -EAGAIN; | |
408 | goto free_old_hdr; | |
409 | } | |
1da177e4 | 410 | while (1) { |
cb59e840 | 411 | retval = 0; /* following macro beats race condition */ |
1da177e4 | 412 | __wait_event_interruptible(sfp->read_wait, |
cb59e840 DG |
413 | (sdp->detached || |
414 | (srp = sg_get_rq_mark(sfp, req_pack_id))), | |
415 | retval); | |
416 | if (sdp->detached) { | |
417 | retval = -ENODEV; | |
418 | goto free_old_hdr; | |
419 | } | |
420 | if (0 == retval) | |
1da177e4 | 421 | break; |
cb59e840 DG |
422 | |
423 | /* -ERESTARTSYS as signal hit process */ | |
424 | goto free_old_hdr; | |
1da177e4 LT |
425 | } |
426 | } | |
cb59e840 DG |
427 | if (srp->header.interface_id != '\0') { |
428 | retval = sg_new_read(sfp, buf, count, srp); | |
429 | goto free_old_hdr; | |
430 | } | |
1da177e4 LT |
431 | |
432 | hp = &srp->header; | |
cb59e840 DG |
433 | if (old_hdr == NULL) { |
434 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
435 | if (! old_hdr) { | |
436 | retval = -ENOMEM; | |
437 | goto free_old_hdr; | |
438 | } | |
439 | } | |
440 | memset(old_hdr, 0, SZ_SG_HEADER); | |
441 | old_hdr->reply_len = (int) hp->timeout; | |
442 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
443 | old_hdr->pack_id = hp->pack_id; | |
444 | old_hdr->twelve_byte = | |
1da177e4 | 445 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 DG |
446 | old_hdr->target_status = hp->masked_status; |
447 | old_hdr->host_status = hp->host_status; | |
448 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
449 | if ((CHECK_CONDITION & hp->masked_status) || |
450 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 DG |
451 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
452 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
453 | switch (hp->host_status) { |
454 | /* This setup of 'result' is for backward compatibility and is best | |
455 | ignored by the user who should use target, host + driver status */ | |
456 | case DID_OK: | |
457 | case DID_PASSTHROUGH: | |
458 | case DID_SOFT_ERROR: | |
cb59e840 | 459 | old_hdr->result = 0; |
1da177e4 LT |
460 | break; |
461 | case DID_NO_CONNECT: | |
462 | case DID_BUS_BUSY: | |
463 | case DID_TIME_OUT: | |
cb59e840 | 464 | old_hdr->result = EBUSY; |
1da177e4 LT |
465 | break; |
466 | case DID_BAD_TARGET: | |
467 | case DID_ABORT: | |
468 | case DID_PARITY: | |
469 | case DID_RESET: | |
470 | case DID_BAD_INTR: | |
cb59e840 | 471 | old_hdr->result = EIO; |
1da177e4 LT |
472 | break; |
473 | case DID_ERROR: | |
cb59e840 | 474 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
475 | hp->masked_status == GOOD) ? 0 : EIO; |
476 | break; | |
477 | default: | |
cb59e840 | 478 | old_hdr->result = EIO; |
1da177e4 LT |
479 | break; |
480 | } | |
481 | ||
482 | /* Now copy the result back to the user buffer. */ | |
483 | if (count >= SZ_SG_HEADER) { | |
cb59e840 DG |
484 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
485 | retval = -EFAULT; | |
486 | goto free_old_hdr; | |
487 | } | |
1da177e4 | 488 | buf += SZ_SG_HEADER; |
cb59e840 DG |
489 | if (count > old_hdr->reply_len) |
490 | count = old_hdr->reply_len; | |
1da177e4 | 491 | if (count > SZ_SG_HEADER) { |
cb59e840 DG |
492 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
493 | retval = -EFAULT; | |
494 | goto free_old_hdr; | |
495 | } | |
1da177e4 LT |
496 | } |
497 | } else | |
cb59e840 | 498 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 499 | sg_finish_rem_req(srp); |
cb59e840 DG |
500 | retval = count; |
501 | free_old_hdr: | |
c9475cb0 | 502 | kfree(old_hdr); |
cb59e840 | 503 | return retval; |
1da177e4 LT |
504 | } |
505 | ||
506 | static ssize_t | |
507 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
508 | { | |
509 | sg_io_hdr_t *hp = &srp->header; | |
510 | int err = 0; | |
511 | int len; | |
512 | ||
513 | if (count < SZ_SG_IO_HDR) { | |
514 | err = -EINVAL; | |
515 | goto err_out; | |
516 | } | |
517 | hp->sb_len_wr = 0; | |
518 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
519 | if ((CHECK_CONDITION & hp->masked_status) || | |
520 | (DRIVER_SENSE & hp->driver_status)) { | |
d6b10348 | 521 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
522 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
523 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
524 | len = (len > sb_len) ? sb_len : len; | |
525 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
526 | err = -EFAULT; | |
527 | goto err_out; | |
528 | } | |
529 | hp->sb_len_wr = len; | |
530 | } | |
531 | } | |
532 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
533 | hp->info |= SG_INFO_CHECK; | |
534 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
535 | err = -EFAULT; | |
536 | goto err_out; | |
537 | } | |
538 | err = sg_read_xfer(srp); | |
539 | err_out: | |
540 | sg_finish_rem_req(srp); | |
541 | return (0 == err) ? count : err; | |
542 | } | |
543 | ||
544 | static ssize_t | |
545 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
546 | { | |
547 | int mxsize, cmd_size, k; | |
548 | int input_size, blocking; | |
549 | unsigned char opcode; | |
550 | Sg_device *sdp; | |
551 | Sg_fd *sfp; | |
552 | Sg_request *srp; | |
553 | struct sg_header old_hdr; | |
554 | sg_io_hdr_t *hp; | |
d6b10348 | 555 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
556 | |
557 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
558 | return -ENXIO; | |
559 | SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", | |
560 | sdp->disk->disk_name, (int) count)); | |
561 | if (sdp->detached) | |
562 | return -ENODEV; | |
563 | if (!((filp->f_flags & O_NONBLOCK) || | |
564 | scsi_block_when_processing_errors(sdp->device))) | |
565 | return -ENXIO; | |
566 | ||
567 | if (!access_ok(VERIFY_READ, buf, count)) | |
568 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
569 | if (count < SZ_SG_HEADER) | |
570 | return -EIO; | |
571 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
572 | return -EFAULT; | |
573 | blocking = !(filp->f_flags & O_NONBLOCK); | |
574 | if (old_hdr.reply_len < 0) | |
0b07de85 | 575 | return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL); |
1da177e4 LT |
576 | if (count < (SZ_SG_HEADER + 6)) |
577 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
578 | ||
579 | if (!(srp = sg_add_request(sfp))) { | |
580 | SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); | |
581 | return -EDOM; | |
582 | } | |
583 | buf += SZ_SG_HEADER; | |
584 | __get_user(opcode, buf); | |
585 | if (sfp->next_cmd_len > 0) { | |
586 | if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { | |
587 | SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); | |
588 | sfp->next_cmd_len = 0; | |
589 | sg_remove_request(sfp, srp); | |
590 | return -EIO; | |
591 | } | |
592 | cmd_size = sfp->next_cmd_len; | |
593 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
594 | } else { | |
595 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
596 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
597 | cmd_size = 12; | |
598 | } | |
599 | SCSI_LOG_TIMEOUT(4, printk( | |
600 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
601 | /* Determine buffer size. */ | |
602 | input_size = count - cmd_size; | |
603 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
604 | mxsize -= SZ_SG_HEADER; | |
605 | input_size -= SZ_SG_HEADER; | |
606 | if (input_size < 0) { | |
607 | sg_remove_request(sfp, srp); | |
608 | return -EIO; /* User did not pass enough bytes for this command. */ | |
609 | } | |
610 | hp = &srp->header; | |
611 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
612 | hp->cmd_len = (unsigned char) cmd_size; | |
613 | hp->iovec_count = 0; | |
614 | hp->mx_sb_len = 0; | |
615 | if (input_size > 0) | |
616 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
617 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
618 | else | |
619 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
620 | hp->dxfer_len = mxsize; | |
621 | hp->dxferp = (char __user *)buf + cmd_size; | |
622 | hp->sbp = NULL; | |
623 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
624 | hp->flags = input_size; /* structure abuse ... */ | |
625 | hp->pack_id = old_hdr.pack_id; | |
626 | hp->usr_ptr = NULL; | |
627 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
628 | return -EFAULT; | |
629 | /* | |
630 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
631 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
632 | * is a non-zero input_size, so emit a warning. | |
633 | */ | |
eaa3e22e AK |
634 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
635 | static char cmd[TASK_COMM_LEN]; | |
636 | if (strcmp(current->comm, cmd) && printk_ratelimit()) { | |
1da177e4 LT |
637 | printk(KERN_WARNING |
638 | "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" | |
639 | "guessing data in;\n" KERN_WARNING " " | |
640 | "program %s not setting count and/or reply_len properly\n", | |
641 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
642 | input_size, (unsigned int) cmnd[0], | |
643 | current->comm); | |
eaa3e22e AK |
644 | strcpy(cmd, current->comm); |
645 | } | |
646 | } | |
1da177e4 LT |
647 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
648 | return (k < 0) ? k : count; | |
649 | } | |
650 | ||
651 | static ssize_t | |
0b07de85 AG |
652 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
653 | size_t count, int blocking, int read_only, | |
654 | Sg_request **o_srp) | |
1da177e4 LT |
655 | { |
656 | int k; | |
657 | Sg_request *srp; | |
658 | sg_io_hdr_t *hp; | |
d6b10348 | 659 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
660 | int timeout; |
661 | unsigned long ul_timeout; | |
662 | ||
663 | if (count < SZ_SG_IO_HDR) | |
664 | return -EINVAL; | |
665 | if (!access_ok(VERIFY_READ, buf, count)) | |
666 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
667 | ||
668 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
669 | if (!(srp = sg_add_request(sfp))) { | |
670 | SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); | |
671 | return -EDOM; | |
672 | } | |
673 | hp = &srp->header; | |
674 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
675 | sg_remove_request(sfp, srp); | |
676 | return -EFAULT; | |
677 | } | |
678 | if (hp->interface_id != 'S') { | |
679 | sg_remove_request(sfp, srp); | |
680 | return -ENOSYS; | |
681 | } | |
682 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
683 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
684 | sg_remove_request(sfp, srp); | |
685 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
686 | } | |
687 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
688 | sg_remove_request(sfp, srp); | |
689 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
690 | } | |
691 | if (sg_res_in_use(sfp)) { | |
692 | sg_remove_request(sfp, srp); | |
693 | return -EBUSY; /* reserve buffer already being used */ | |
694 | } | |
695 | } | |
696 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
697 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
698 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
699 | sg_remove_request(sfp, srp); | |
700 | return -EMSGSIZE; | |
701 | } | |
702 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
703 | sg_remove_request(sfp, srp); | |
704 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
705 | } | |
706 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
707 | sg_remove_request(sfp, srp); | |
708 | return -EFAULT; | |
709 | } | |
14e507b8 | 710 | if (read_only && sg_allow_access(file, cmnd)) { |
1da177e4 LT |
711 | sg_remove_request(sfp, srp); |
712 | return -EPERM; | |
713 | } | |
714 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
715 | if (k < 0) | |
716 | return k; | |
717 | if (o_srp) | |
718 | *o_srp = srp; | |
719 | return count; | |
720 | } | |
721 | ||
722 | static int | |
723 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
724 | unsigned char *cmnd, int timeout, int blocking) | |
725 | { | |
d6b10348 | 726 | int k, data_dir; |
1da177e4 LT |
727 | Sg_device *sdp = sfp->parentdp; |
728 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
729 | |
730 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
731 | hp->status = 0; | |
732 | hp->masked_status = 0; | |
733 | hp->msg_status = 0; | |
734 | hp->info = 0; | |
735 | hp->host_status = 0; | |
736 | hp->driver_status = 0; | |
737 | hp->resid = 0; | |
738 | SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
739 | (int) cmnd[0], (int) hp->cmd_len)); | |
740 | ||
10865dfa FT |
741 | k = sg_start_req(srp, cmnd); |
742 | if (k) { | |
7ca63cb4 | 743 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); |
1da177e4 LT |
744 | sg_finish_rem_req(srp); |
745 | return k; /* probably out of space --> ENOMEM */ | |
746 | } | |
747 | if ((k = sg_write_xfer(srp))) { | |
7ca63cb4 | 748 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n")); |
1da177e4 LT |
749 | sg_finish_rem_req(srp); |
750 | return k; | |
751 | } | |
752 | if (sdp->detached) { | |
753 | sg_finish_rem_req(srp); | |
754 | return -ENODEV; | |
755 | } | |
1da177e4 | 756 | |
1da177e4 LT |
757 | switch (hp->dxfer_direction) { |
758 | case SG_DXFER_TO_FROM_DEV: | |
759 | case SG_DXFER_FROM_DEV: | |
d6b10348 | 760 | data_dir = DMA_FROM_DEVICE; |
1da177e4 LT |
761 | break; |
762 | case SG_DXFER_TO_DEV: | |
d6b10348 | 763 | data_dir = DMA_TO_DEVICE; |
1da177e4 LT |
764 | break; |
765 | case SG_DXFER_UNKNOWN: | |
d6b10348 | 766 | data_dir = DMA_BIDIRECTIONAL; |
1da177e4 LT |
767 | break; |
768 | default: | |
d6b10348 | 769 | data_dir = DMA_NONE; |
1da177e4 LT |
770 | break; |
771 | } | |
cb59e840 | 772 | hp->duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
773 | /* Now send everything of to mid-level. The next time we hear about this |
774 | packet is when sg_cmd_done() is called (i.e. a callback). */ | |
10865dfa FT |
775 | if (srp->rq) { |
776 | srp->rq->timeout = timeout; | |
777 | blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, | |
778 | srp->rq, 1, sg_rq_end_io); | |
779 | return 0; | |
780 | } | |
bb1d1073 | 781 | if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, |
d6b10348 MC |
782 | hp->dxfer_len, srp->data.k_use_sg, timeout, |
783 | SG_DEFAULT_RETRIES, srp, sg_cmd_done, | |
784 | GFP_ATOMIC)) { | |
7ca63cb4 | 785 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); |
d6b10348 MC |
786 | /* |
787 | * most likely out of mem, but could also be a bad map | |
788 | */ | |
18c49b8c | 789 | sg_finish_rem_req(srp); |
d6b10348 MC |
790 | return -ENOMEM; |
791 | } else | |
792 | return 0; | |
1da177e4 LT |
793 | } |
794 | ||
795 | static int | |
796 | sg_srp_done(Sg_request *srp, Sg_fd *sfp) | |
797 | { | |
798 | unsigned long iflags; | |
799 | int done; | |
800 | ||
801 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
802 | done = srp->done; | |
803 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
804 | return done; | |
805 | } | |
806 | ||
807 | static int | |
808 | sg_ioctl(struct inode *inode, struct file *filp, | |
809 | unsigned int cmd_in, unsigned long arg) | |
810 | { | |
811 | void __user *p = (void __user *)arg; | |
812 | int __user *ip = p; | |
813 | int result, val, read_only; | |
814 | Sg_device *sdp; | |
815 | Sg_fd *sfp; | |
816 | Sg_request *srp; | |
817 | unsigned long iflags; | |
818 | ||
819 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
820 | return -ENXIO; | |
abf54393 | 821 | |
1da177e4 LT |
822 | SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", |
823 | sdp->disk->disk_name, (int) cmd_in)); | |
824 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
825 | ||
826 | switch (cmd_in) { | |
827 | case SG_IO: | |
828 | { | |
829 | int blocking = 1; /* ignore O_NONBLOCK flag */ | |
830 | ||
831 | if (sdp->detached) | |
832 | return -ENODEV; | |
833 | if (!scsi_block_when_processing_errors(sdp->device)) | |
834 | return -ENXIO; | |
835 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
836 | return -EFAULT; | |
837 | result = | |
0b07de85 | 838 | sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
1da177e4 LT |
839 | blocking, read_only, &srp); |
840 | if (result < 0) | |
841 | return result; | |
842 | srp->sg_io_owned = 1; | |
843 | while (1) { | |
844 | result = 0; /* following macro to beat race condition */ | |
845 | __wait_event_interruptible(sfp->read_wait, | |
846 | (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), | |
847 | result); | |
848 | if (sdp->detached) | |
849 | return -ENODEV; | |
850 | if (sfp->closed) | |
851 | return 0; /* request packet dropped already */ | |
852 | if (0 == result) | |
853 | break; | |
854 | srp->orphan = 1; | |
855 | return result; /* -ERESTARTSYS because signal hit process */ | |
856 | } | |
857 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
858 | srp->done = 2; | |
859 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
860 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); | |
861 | return (result < 0) ? result : 0; | |
862 | } | |
863 | case SG_SET_TIMEOUT: | |
864 | result = get_user(val, ip); | |
865 | if (result) | |
866 | return result; | |
867 | if (val < 0) | |
868 | return -EIO; | |
869 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
870 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
871 | sfp->timeout_user = val; | |
872 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
873 | ||
874 | return 0; | |
875 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
876 | /* strange ..., for backward compatibility */ | |
877 | return sfp->timeout_user; | |
878 | case SG_SET_FORCE_LOW_DMA: | |
879 | result = get_user(val, ip); | |
880 | if (result) | |
881 | return result; | |
882 | if (val) { | |
883 | sfp->low_dma = 1; | |
884 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
885 | val = (int) sfp->reserve.bufflen; | |
886 | sg_remove_scat(&sfp->reserve); | |
887 | sg_build_reserve(sfp, val); | |
888 | } | |
889 | } else { | |
890 | if (sdp->detached) | |
891 | return -ENODEV; | |
892 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
893 | } | |
894 | return 0; | |
895 | case SG_GET_LOW_DMA: | |
896 | return put_user((int) sfp->low_dma, ip); | |
897 | case SG_GET_SCSI_ID: | |
898 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
899 | return -EFAULT; | |
900 | else { | |
901 | sg_scsi_id_t __user *sg_idp = p; | |
902 | ||
903 | if (sdp->detached) | |
904 | return -ENODEV; | |
905 | __put_user((int) sdp->device->host->host_no, | |
906 | &sg_idp->host_no); | |
907 | __put_user((int) sdp->device->channel, | |
908 | &sg_idp->channel); | |
909 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
910 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
911 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
912 | __put_user((short) sdp->device->host->cmd_per_lun, | |
913 | &sg_idp->h_cmd_per_lun); | |
914 | __put_user((short) sdp->device->queue_depth, | |
915 | &sg_idp->d_queue_depth); | |
916 | __put_user(0, &sg_idp->unused[0]); | |
917 | __put_user(0, &sg_idp->unused[1]); | |
918 | return 0; | |
919 | } | |
920 | case SG_SET_FORCE_PACK_ID: | |
921 | result = get_user(val, ip); | |
922 | if (result) | |
923 | return result; | |
924 | sfp->force_packid = val ? 1 : 0; | |
925 | return 0; | |
926 | case SG_GET_PACK_ID: | |
927 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
928 | return -EFAULT; | |
929 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
930 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
931 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
932 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
933 | iflags); | |
934 | __put_user(srp->header.pack_id, ip); | |
935 | return 0; | |
936 | } | |
937 | } | |
938 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
939 | __put_user(-1, ip); | |
940 | return 0; | |
941 | case SG_GET_NUM_WAITING: | |
942 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
943 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
944 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
945 | ++val; | |
946 | } | |
947 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
948 | return put_user(val, ip); | |
949 | case SG_GET_SG_TABLESIZE: | |
950 | return put_user(sdp->sg_tablesize, ip); | |
951 | case SG_SET_RESERVED_SIZE: | |
952 | result = get_user(val, ip); | |
953 | if (result) | |
954 | return result; | |
955 | if (val < 0) | |
956 | return -EINVAL; | |
44ec9542 AS |
957 | val = min_t(int, val, |
958 | sdp->device->request_queue->max_sectors * 512); | |
1da177e4 LT |
959 | if (val != sfp->reserve.bufflen) { |
960 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
961 | return -EBUSY; | |
962 | sg_remove_scat(&sfp->reserve); | |
963 | sg_build_reserve(sfp, val); | |
964 | } | |
965 | return 0; | |
966 | case SG_GET_RESERVED_SIZE: | |
44ec9542 AS |
967 | val = min_t(int, sfp->reserve.bufflen, |
968 | sdp->device->request_queue->max_sectors * 512); | |
1da177e4 LT |
969 | return put_user(val, ip); |
970 | case SG_SET_COMMAND_Q: | |
971 | result = get_user(val, ip); | |
972 | if (result) | |
973 | return result; | |
974 | sfp->cmd_q = val ? 1 : 0; | |
975 | return 0; | |
976 | case SG_GET_COMMAND_Q: | |
977 | return put_user((int) sfp->cmd_q, ip); | |
978 | case SG_SET_KEEP_ORPHAN: | |
979 | result = get_user(val, ip); | |
980 | if (result) | |
981 | return result; | |
982 | sfp->keep_orphan = val; | |
983 | return 0; | |
984 | case SG_GET_KEEP_ORPHAN: | |
985 | return put_user((int) sfp->keep_orphan, ip); | |
986 | case SG_NEXT_CMD_LEN: | |
987 | result = get_user(val, ip); | |
988 | if (result) | |
989 | return result; | |
990 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
991 | return 0; | |
992 | case SG_GET_VERSION_NUM: | |
993 | return put_user(sg_version_num, ip); | |
994 | case SG_GET_ACCESS_COUNT: | |
995 | /* faked - we don't have a real access count anymore */ | |
996 | val = (sdp->device ? 1 : 0); | |
997 | return put_user(val, ip); | |
998 | case SG_GET_REQUEST_TABLE: | |
999 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
1000 | return -EFAULT; | |
1001 | else { | |
cb59e840 DG |
1002 | sg_req_info_t *rinfo; |
1003 | unsigned int ms; | |
1004 | ||
1005 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
1006 | GFP_KERNEL); | |
1007 | if (!rinfo) | |
1008 | return -ENOMEM; | |
1da177e4 LT |
1009 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
1010 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
1011 | ++val, srp = srp ? srp->nextrp : srp) { | |
1012 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
1013 | if (srp) { | |
1014 | rinfo[val].req_state = srp->done + 1; | |
1015 | rinfo[val].problem = | |
1016 | srp->header.masked_status & | |
1017 | srp->header.host_status & | |
1018 | srp->header.driver_status; | |
cb59e840 DG |
1019 | if (srp->done) |
1020 | rinfo[val].duration = | |
1021 | srp->header.duration; | |
1022 | else { | |
1023 | ms = jiffies_to_msecs(jiffies); | |
1024 | rinfo[val].duration = | |
1025 | (ms > srp->header.duration) ? | |
1026 | (ms - srp->header.duration) : 0; | |
1027 | } | |
1da177e4 | 1028 | rinfo[val].orphan = srp->orphan; |
cb59e840 DG |
1029 | rinfo[val].sg_io_owned = |
1030 | srp->sg_io_owned; | |
1031 | rinfo[val].pack_id = | |
1032 | srp->header.pack_id; | |
1033 | rinfo[val].usr_ptr = | |
1034 | srp->header.usr_ptr; | |
1da177e4 LT |
1035 | } |
1036 | } | |
1037 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 DG |
1038 | result = __copy_to_user(p, rinfo, |
1039 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
1040 | result = result ? -EFAULT : 0; | |
1041 | kfree(rinfo); | |
1042 | return result; | |
1da177e4 LT |
1043 | } |
1044 | case SG_EMULATED_HOST: | |
1045 | if (sdp->detached) | |
1046 | return -ENODEV; | |
1047 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1048 | case SG_SCSI_RESET: | |
1049 | if (sdp->detached) | |
1050 | return -ENODEV; | |
1051 | if (filp->f_flags & O_NONBLOCK) { | |
939647ee | 1052 | if (scsi_host_in_recovery(sdp->device->host)) |
1da177e4 LT |
1053 | return -EBUSY; |
1054 | } else if (!scsi_block_when_processing_errors(sdp->device)) | |
1055 | return -EBUSY; | |
1056 | result = get_user(val, ip); | |
1057 | if (result) | |
1058 | return result; | |
1059 | if (SG_SCSI_RESET_NOTHING == val) | |
1060 | return 0; | |
1061 | switch (val) { | |
1062 | case SG_SCSI_RESET_DEVICE: | |
1063 | val = SCSI_TRY_RESET_DEVICE; | |
1064 | break; | |
39120e11 BK |
1065 | case SG_SCSI_RESET_TARGET: |
1066 | val = SCSI_TRY_RESET_TARGET; | |
1067 | break; | |
1da177e4 LT |
1068 | case SG_SCSI_RESET_BUS: |
1069 | val = SCSI_TRY_RESET_BUS; | |
1070 | break; | |
1071 | case SG_SCSI_RESET_HOST: | |
1072 | val = SCSI_TRY_RESET_HOST; | |
1073 | break; | |
1074 | default: | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1078 | return -EACCES; | |
1079 | return (scsi_reset_provider(sdp->device, val) == | |
1080 | SUCCESS) ? 0 : -EIO; | |
1081 | case SCSI_IOCTL_SEND_COMMAND: | |
1082 | if (sdp->detached) | |
1083 | return -ENODEV; | |
1084 | if (read_only) { | |
1085 | unsigned char opcode = WRITE_6; | |
1086 | Scsi_Ioctl_Command __user *siocp = p; | |
1087 | ||
1088 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1089 | return -EFAULT; | |
14e507b8 | 1090 | if (sg_allow_access(filp, &opcode)) |
1da177e4 LT |
1091 | return -EPERM; |
1092 | } | |
21b2f0c8 | 1093 | return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); |
1da177e4 LT |
1094 | case SG_SET_DEBUG: |
1095 | result = get_user(val, ip); | |
1096 | if (result) | |
1097 | return result; | |
1098 | sdp->sgdebug = (char) val; | |
1099 | return 0; | |
1100 | case SCSI_IOCTL_GET_IDLUN: | |
1101 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1102 | case SCSI_IOCTL_PROBE_HOST: | |
1103 | case SG_GET_TRANSFORM: | |
1104 | if (sdp->detached) | |
1105 | return -ENODEV; | |
1106 | return scsi_ioctl(sdp->device, cmd_in, p); | |
44ec9542 AS |
1107 | case BLKSECTGET: |
1108 | return put_user(sdp->device->request_queue->max_sectors * 512, | |
1109 | ip); | |
6da127ad CS |
1110 | case BLKTRACESETUP: |
1111 | return blk_trace_setup(sdp->device->request_queue, | |
1112 | sdp->disk->disk_name, | |
1113 | sdp->device->sdev_gendev.devt, | |
1114 | (char *)arg); | |
1115 | case BLKTRACESTART: | |
1116 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1117 | case BLKTRACESTOP: | |
1118 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1119 | case BLKTRACETEARDOWN: | |
1120 | return blk_trace_remove(sdp->device->request_queue); | |
1da177e4 LT |
1121 | default: |
1122 | if (read_only) | |
1123 | return -EPERM; /* don't know so take safe approach */ | |
1124 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1125 | } | |
1126 | } | |
1127 | ||
1128 | #ifdef CONFIG_COMPAT | |
1129 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1130 | { | |
1131 | Sg_device *sdp; | |
1132 | Sg_fd *sfp; | |
1133 | struct scsi_device *sdev; | |
1134 | ||
1135 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1136 | return -ENXIO; | |
1137 | ||
1138 | sdev = sdp->device; | |
1139 | if (sdev->host->hostt->compat_ioctl) { | |
1140 | int ret; | |
1141 | ||
1142 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1143 | ||
1144 | return ret; | |
1145 | } | |
1146 | ||
1147 | return -ENOIOCTLCMD; | |
1148 | } | |
1149 | #endif | |
1150 | ||
1151 | static unsigned int | |
1152 | sg_poll(struct file *filp, poll_table * wait) | |
1153 | { | |
1154 | unsigned int res = 0; | |
1155 | Sg_device *sdp; | |
1156 | Sg_fd *sfp; | |
1157 | Sg_request *srp; | |
1158 | int count = 0; | |
1159 | unsigned long iflags; | |
1160 | ||
1161 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) | |
1162 | || sfp->closed) | |
1163 | return POLLERR; | |
1164 | poll_wait(filp, &sfp->read_wait, wait); | |
1165 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1166 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1167 | /* if any read waiting, flag it */ | |
1168 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1169 | res = POLLIN | POLLRDNORM; | |
1170 | ++count; | |
1171 | } | |
1172 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1173 | ||
1174 | if (sdp->detached) | |
1175 | res |= POLLHUP; | |
1176 | else if (!sfp->cmd_q) { | |
1177 | if (0 == count) | |
1178 | res |= POLLOUT | POLLWRNORM; | |
1179 | } else if (count < SG_MAX_QUEUE) | |
1180 | res |= POLLOUT | POLLWRNORM; | |
1181 | SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", | |
1182 | sdp->disk->disk_name, (int) res)); | |
1183 | return res; | |
1184 | } | |
1185 | ||
1186 | static int | |
1187 | sg_fasync(int fd, struct file *filp, int mode) | |
1188 | { | |
1189 | int retval; | |
1190 | Sg_device *sdp; | |
1191 | Sg_fd *sfp; | |
1192 | ||
1193 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1194 | return -ENXIO; | |
1195 | SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", | |
1196 | sdp->disk->disk_name, mode)); | |
1197 | ||
1198 | retval = fasync_helper(fd, filp, mode, &sfp->async_qp); | |
1199 | return (retval < 0) ? retval : 0; | |
1200 | } | |
1201 | ||
a13ff0bb NP |
1202 | static int |
1203 | sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1da177e4 LT |
1204 | { |
1205 | Sg_fd *sfp; | |
d6b10348 | 1206 | unsigned long offset, len, sa; |
1da177e4 | 1207 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1208 | struct scatterlist *sg; |
1209 | int k; | |
1da177e4 LT |
1210 | |
1211 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
a13ff0bb | 1212 | return VM_FAULT_SIGBUS; |
1da177e4 | 1213 | rsv_schp = &sfp->reserve; |
a13ff0bb | 1214 | offset = vmf->pgoff << PAGE_SHIFT; |
1da177e4 | 1215 | if (offset >= rsv_schp->bufflen) |
a13ff0bb NP |
1216 | return VM_FAULT_SIGBUS; |
1217 | SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", | |
1da177e4 | 1218 | offset, rsv_schp->k_use_sg)); |
d6b10348 MC |
1219 | sg = rsv_schp->buffer; |
1220 | sa = vma->vm_start; | |
1221 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
b0f655d0 | 1222 | ++k, sg = sg_next(sg)) { |
d6b10348 MC |
1223 | len = vma->vm_end - sa; |
1224 | len = (len < sg->length) ? len : sg->length; | |
1225 | if (offset < len) { | |
a13ff0bb | 1226 | struct page *page; |
45711f1a | 1227 | page = virt_to_page(page_address(sg_page(sg)) + offset); |
d6b10348 | 1228 | get_page(page); /* increment page count */ |
a13ff0bb NP |
1229 | vmf->page = page; |
1230 | return 0; /* success */ | |
1da177e4 | 1231 | } |
d6b10348 MC |
1232 | sa += len; |
1233 | offset -= len; | |
1da177e4 | 1234 | } |
d6b10348 | 1235 | |
a13ff0bb | 1236 | return VM_FAULT_SIGBUS; |
1da177e4 LT |
1237 | } |
1238 | ||
1239 | static struct vm_operations_struct sg_mmap_vm_ops = { | |
a13ff0bb | 1240 | .fault = sg_vma_fault, |
1da177e4 LT |
1241 | }; |
1242 | ||
1243 | static int | |
1244 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1245 | { | |
1246 | Sg_fd *sfp; | |
d6b10348 | 1247 | unsigned long req_sz, len, sa; |
1da177e4 | 1248 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1249 | int k; |
1250 | struct scatterlist *sg; | |
1da177e4 LT |
1251 | |
1252 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1253 | return -ENXIO; | |
cb59e840 | 1254 | req_sz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
1255 | SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", |
1256 | (void *) vma->vm_start, (int) req_sz)); | |
1257 | if (vma->vm_pgoff) | |
1258 | return -EINVAL; /* want no offset */ | |
1259 | rsv_schp = &sfp->reserve; | |
1260 | if (req_sz > rsv_schp->bufflen) | |
1261 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1262 | ||
d6b10348 MC |
1263 | sa = vma->vm_start; |
1264 | sg = rsv_schp->buffer; | |
1265 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
b0f655d0 | 1266 | ++k, sg = sg_next(sg)) { |
d6b10348 MC |
1267 | len = vma->vm_end - sa; |
1268 | len = (len < sg->length) ? len : sg->length; | |
1269 | sa += len; | |
1da177e4 | 1270 | } |
d6b10348 | 1271 | |
f9aed0e2 | 1272 | sfp->mmap_called = 1; |
1c8e71d7 | 1273 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
1274 | vma->vm_private_data = sfp; |
1275 | vma->vm_ops = &sg_mmap_vm_ops; | |
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | /* This function is a "bottom half" handler that is called by the | |
1280 | * mid level when a command is completed (or has failed). */ | |
1281 | static void | |
d6b10348 | 1282 | sg_cmd_done(void *data, char *sense, int result, int resid) |
1da177e4 | 1283 | { |
d6b10348 | 1284 | Sg_request *srp = data; |
1da177e4 LT |
1285 | Sg_device *sdp = NULL; |
1286 | Sg_fd *sfp; | |
1da177e4 | 1287 | unsigned long iflags; |
cb59e840 | 1288 | unsigned int ms; |
1da177e4 | 1289 | |
1da177e4 LT |
1290 | if (NULL == srp) { |
1291 | printk(KERN_ERR "sg_cmd_done: NULL request\n"); | |
1da177e4 LT |
1292 | return; |
1293 | } | |
1294 | sfp = srp->parentfp; | |
1295 | if (sfp) | |
1296 | sdp = sfp->parentdp; | |
1297 | if ((NULL == sdp) || sdp->detached) { | |
1298 | printk(KERN_INFO "sg_cmd_done: device detached\n"); | |
1da177e4 LT |
1299 | return; |
1300 | } | |
1301 | ||
1da177e4 LT |
1302 | |
1303 | SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", | |
d6b10348 MC |
1304 | sdp->disk->disk_name, srp->header.pack_id, result)); |
1305 | srp->header.resid = resid; | |
cb59e840 DG |
1306 | ms = jiffies_to_msecs(jiffies); |
1307 | srp->header.duration = (ms > srp->header.duration) ? | |
1308 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1309 | if (0 != result) { |
1da177e4 LT |
1310 | struct scsi_sense_hdr sshdr; |
1311 | ||
d6b10348 MC |
1312 | memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); |
1313 | srp->header.status = 0xff & result; | |
1314 | srp->header.masked_status = status_byte(result); | |
1315 | srp->header.msg_status = msg_byte(result); | |
1316 | srp->header.host_status = host_byte(result); | |
1317 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1318 | if ((sdp->sgdebug > 0) && |
1319 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1320 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d6b10348 MC |
1321 | __scsi_print_sense("sg_cmd_done", sense, |
1322 | SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
1323 | |
1324 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1325 | if (driver_byte(result) != 0 |
1326 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1327 | && !scsi_sense_is_deferred(&sshdr) |
1328 | && sshdr.sense_key == UNIT_ATTENTION | |
1329 | && sdp->device->removable) { | |
1330 | /* Detected possible disc change. Set the bit - this */ | |
1331 | /* may be used if there are filesystems using this device */ | |
1332 | sdp->device->changed = 1; | |
1333 | } | |
1334 | } | |
1335 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1336 | ||
1da177e4 LT |
1337 | if (sfp->closed) { /* whoops this fd already released, cleanup */ |
1338 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); | |
1339 | sg_finish_rem_req(srp); | |
1340 | srp = NULL; | |
1341 | if (NULL == sfp->headrp) { | |
7ca63cb4 | 1342 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); |
1da177e4 LT |
1343 | if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ |
1344 | scsi_device_put(sdp->device); | |
1345 | } | |
1346 | sfp = NULL; | |
1347 | } | |
1348 | } else if (srp && srp->orphan) { | |
1349 | if (sfp->keep_orphan) | |
1350 | srp->sg_io_owned = 0; | |
1351 | else { | |
1352 | sg_finish_rem_req(srp); | |
1353 | srp = NULL; | |
1354 | } | |
1355 | } | |
1356 | if (sfp && srp) { | |
1357 | /* Now wake up any sg_read() that is waiting for this packet. */ | |
1358 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); | |
1359 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1360 | srp->done = 1; | |
1361 | wake_up_interruptible(&sfp->read_wait); | |
1362 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | static struct file_operations sg_fops = { | |
1367 | .owner = THIS_MODULE, | |
1368 | .read = sg_read, | |
1369 | .write = sg_write, | |
1370 | .poll = sg_poll, | |
1371 | .ioctl = sg_ioctl, | |
1372 | #ifdef CONFIG_COMPAT | |
1373 | .compat_ioctl = sg_compat_ioctl, | |
1374 | #endif | |
1375 | .open = sg_open, | |
1376 | .mmap = sg_mmap, | |
1377 | .release = sg_release, | |
1378 | .fasync = sg_fasync, | |
1379 | }; | |
1380 | ||
d253878b | 1381 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1382 | |
1383 | static int sg_sysfs_valid = 0; | |
1384 | ||
7c07d613 | 1385 | static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) |
1da177e4 | 1386 | { |
d6b10348 | 1387 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1388 | Sg_device *sdp; |
1389 | unsigned long iflags; | |
7c07d613 JB |
1390 | int error; |
1391 | u32 k; | |
1da177e4 | 1392 | |
24669f75 | 1393 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
1da177e4 LT |
1394 | if (!sdp) { |
1395 | printk(KERN_WARNING "kmalloc Sg_device failure\n"); | |
7c07d613 JB |
1396 | return ERR_PTR(-ENOMEM); |
1397 | } | |
1398 | error = -ENOMEM; | |
1399 | if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { | |
1400 | printk(KERN_WARNING "idr expansion Sg_device failure\n"); | |
1401 | goto out; | |
1da177e4 LT |
1402 | } |
1403 | ||
7c07d613 JB |
1404 | write_lock_irqsave(&sg_index_lock, iflags); |
1405 | error = idr_get_new(&sg_index_idr, sdp, &k); | |
1406 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 | 1407 | |
7c07d613 JB |
1408 | if (error) { |
1409 | printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", | |
1410 | error); | |
1411 | goto out; | |
1da177e4 LT |
1412 | } |
1413 | ||
1da177e4 LT |
1414 | if (unlikely(k >= SG_MAX_DEVS)) |
1415 | goto overflow; | |
1416 | ||
1da177e4 LT |
1417 | SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); |
1418 | sprintf(disk->disk_name, "sg%d", k); | |
1419 | disk->first_minor = k; | |
1420 | sdp->disk = disk; | |
1421 | sdp->device = scsidp; | |
1422 | init_waitqueue_head(&sdp->o_excl_wait); | |
d6b10348 | 1423 | sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); |
7c07d613 | 1424 | sdp->index = k; |
1da177e4 | 1425 | |
7c07d613 | 1426 | error = 0; |
1da177e4 | 1427 | out: |
7c07d613 | 1428 | if (error) { |
1da177e4 | 1429 | kfree(sdp); |
7c07d613 JB |
1430 | return ERR_PTR(error); |
1431 | } | |
1432 | return sdp; | |
1da177e4 LT |
1433 | |
1434 | overflow: | |
9ccfc756 JB |
1435 | sdev_printk(KERN_WARNING, scsidp, |
1436 | "Unable to attach sg device type=%d, minor " | |
1437 | "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); | |
1da177e4 LT |
1438 | error = -ENODEV; |
1439 | goto out; | |
1440 | } | |
1441 | ||
1442 | static int | |
ee959b00 | 1443 | sg_add(struct device *cl_dev, struct class_interface *cl_intf) |
1da177e4 | 1444 | { |
ee959b00 | 1445 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1da177e4 LT |
1446 | struct gendisk *disk; |
1447 | Sg_device *sdp = NULL; | |
1448 | struct cdev * cdev = NULL; | |
7c07d613 | 1449 | int error; |
454e8957 | 1450 | unsigned long iflags; |
1da177e4 LT |
1451 | |
1452 | disk = alloc_disk(1); | |
1453 | if (!disk) { | |
1454 | printk(KERN_WARNING "alloc_disk failed\n"); | |
1455 | return -ENOMEM; | |
1456 | } | |
1457 | disk->major = SCSI_GENERIC_MAJOR; | |
1458 | ||
1459 | error = -ENOMEM; | |
1460 | cdev = cdev_alloc(); | |
1461 | if (!cdev) { | |
1462 | printk(KERN_WARNING "cdev_alloc failed\n"); | |
1463 | goto out; | |
1464 | } | |
1465 | cdev->owner = THIS_MODULE; | |
1466 | cdev->ops = &sg_fops; | |
1467 | ||
7c07d613 JB |
1468 | sdp = sg_alloc(disk, scsidp); |
1469 | if (IS_ERR(sdp)) { | |
1da177e4 | 1470 | printk(KERN_WARNING "sg_alloc failed\n"); |
7c07d613 | 1471 | error = PTR_ERR(sdp); |
1da177e4 LT |
1472 | goto out; |
1473 | } | |
1da177e4 | 1474 | |
7c07d613 | 1475 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
5e3c34c1 | 1476 | if (error) |
454e8957 | 1477 | goto cdev_add_err; |
5e3c34c1 | 1478 | |
1da177e4 LT |
1479 | sdp->cdev = cdev; |
1480 | if (sg_sysfs_valid) { | |
ee959b00 | 1481 | struct device *sg_class_member; |
1da177e4 | 1482 | |
24b42566 GKH |
1483 | sg_class_member = device_create_drvdata(sg_sysfs_class, |
1484 | cl_dev->parent, | |
1485 | MKDEV(SCSI_GENERIC_MAJOR, | |
1486 | sdp->index), | |
1487 | sdp, | |
1488 | "%s", disk->disk_name); | |
d07e0361 FT |
1489 | if (IS_ERR(sg_class_member)) { |
1490 | printk(KERN_ERR "sg_add: " | |
ee959b00 | 1491 | "device_create failed\n"); |
d07e0361 FT |
1492 | error = PTR_ERR(sg_class_member); |
1493 | goto cdev_add_err; | |
1494 | } | |
d07e0361 | 1495 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
1da177e4 LT |
1496 | &sg_class_member->kobj, "generic"); |
1497 | if (error) | |
1498 | printk(KERN_ERR "sg_add: unable to make symlink " | |
7c07d613 | 1499 | "'generic' back to sg%d\n", sdp->index); |
1da177e4 | 1500 | } else |
7c07d613 | 1501 | printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); |
1da177e4 | 1502 | |
9ccfc756 | 1503 | sdev_printk(KERN_NOTICE, scsidp, |
7c07d613 JB |
1504 | "Attached scsi generic sg%d type %d\n", sdp->index, |
1505 | scsidp->type); | |
1da177e4 | 1506 | |
ee959b00 | 1507 | dev_set_drvdata(cl_dev, sdp); |
a24484f2 | 1508 | |
1da177e4 LT |
1509 | return 0; |
1510 | ||
454e8957 | 1511 | cdev_add_err: |
7c07d613 JB |
1512 | write_lock_irqsave(&sg_index_lock, iflags); |
1513 | idr_remove(&sg_index_idr, sdp->index); | |
1514 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1515 | kfree(sdp); | |
454e8957 | 1516 | |
1da177e4 LT |
1517 | out: |
1518 | put_disk(disk); | |
1519 | if (cdev) | |
1520 | cdev_del(cdev); | |
1521 | return error; | |
1522 | } | |
1523 | ||
1524 | static void | |
ee959b00 | 1525 | sg_remove(struct device *cl_dev, struct class_interface *cl_intf) |
1da177e4 | 1526 | { |
ee959b00 TJ |
1527 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1528 | Sg_device *sdp = dev_get_drvdata(cl_dev); | |
1da177e4 LT |
1529 | unsigned long iflags; |
1530 | Sg_fd *sfp; | |
1531 | Sg_fd *tsfp; | |
1532 | Sg_request *srp; | |
1533 | Sg_request *tsrp; | |
7c07d613 | 1534 | int delay; |
1da177e4 | 1535 | |
7c07d613 | 1536 | if (!sdp) |
1da177e4 | 1537 | return; |
7c07d613 | 1538 | |
1da177e4 | 1539 | delay = 0; |
7c07d613 JB |
1540 | write_lock_irqsave(&sg_index_lock, iflags); |
1541 | if (sdp->headfp) { | |
1542 | sdp->detached = 1; | |
1543 | for (sfp = sdp->headfp; sfp; sfp = tsfp) { | |
1544 | tsfp = sfp->nextfp; | |
1545 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
1546 | tsrp = srp->nextrp; | |
1547 | if (sfp->closed || (0 == sg_srp_done(srp, sfp))) | |
1548 | sg_finish_rem_req(srp); | |
1da177e4 | 1549 | } |
7c07d613 JB |
1550 | if (sfp->closed) { |
1551 | scsi_device_put(sdp->device); | |
1552 | __sg_remove_sfp(sdp, sfp); | |
1553 | } else { | |
1554 | delay = 1; | |
1555 | wake_up_interruptible(&sfp->read_wait); | |
1556 | kill_fasync(&sfp->async_qp, SIGPOLL, | |
1557 | POLL_HUP); | |
1da177e4 | 1558 | } |
1da177e4 | 1559 | } |
7c07d613 JB |
1560 | SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index)); |
1561 | if (NULL == sdp->headfp) { | |
1562 | idr_remove(&sg_index_idr, sdp->index); | |
1563 | } | |
1564 | } else { /* nothing active, simple case */ | |
1565 | SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); | |
1566 | idr_remove(&sg_index_idr, sdp->index); | |
1567 | } | |
1568 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1569 | ||
1570 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
ee959b00 | 1571 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
7c07d613 JB |
1572 | cdev_del(sdp->cdev); |
1573 | sdp->cdev = NULL; | |
1574 | put_disk(sdp->disk); | |
1575 | sdp->disk = NULL; | |
1576 | if (NULL == sdp->headfp) | |
1577 | kfree(sdp); | |
1da177e4 LT |
1578 | |
1579 | if (delay) | |
1580 | msleep(10); /* dirty detach so delay device destruction */ | |
1581 | } | |
1582 | ||
6460e75a DG |
1583 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
1584 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1585 | S_IRUGO | S_IWUSR); | |
1da177e4 LT |
1586 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
1587 | ||
1588 | MODULE_AUTHOR("Douglas Gilbert"); | |
1589 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1590 | MODULE_LICENSE("GPL"); | |
1591 | MODULE_VERSION(SG_VERSION_STR); | |
f018fa55 | 1592 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
1da177e4 | 1593 | |
6460e75a DG |
1594 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
1595 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1da177e4 LT |
1596 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
1597 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1598 | ||
1599 | static int __init | |
1600 | init_sg(void) | |
1601 | { | |
1602 | int rc; | |
1603 | ||
6460e75a DG |
1604 | if (scatter_elem_sz < PAGE_SIZE) { |
1605 | scatter_elem_sz = PAGE_SIZE; | |
1606 | scatter_elem_sz_prev = scatter_elem_sz; | |
1607 | } | |
1da177e4 LT |
1608 | if (def_reserved_size >= 0) |
1609 | sg_big_buff = def_reserved_size; | |
6460e75a DG |
1610 | else |
1611 | def_reserved_size = sg_big_buff; | |
1da177e4 LT |
1612 | |
1613 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1614 | SG_MAX_DEVS, "sg"); | |
1615 | if (rc) | |
1616 | return rc; | |
d253878b | 1617 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1618 | if ( IS_ERR(sg_sysfs_class) ) { |
1619 | rc = PTR_ERR(sg_sysfs_class); | |
1620 | goto err_out; | |
1621 | } | |
1622 | sg_sysfs_valid = 1; | |
1623 | rc = scsi_register_interface(&sg_interface); | |
1624 | if (0 == rc) { | |
1625 | #ifdef CONFIG_SCSI_PROC_FS | |
1626 | sg_proc_init(); | |
1627 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1628 | return 0; | |
1629 | } | |
d253878b | 1630 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1631 | err_out: |
1632 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1633 | return rc; | |
1634 | } | |
1635 | ||
1636 | static void __exit | |
1637 | exit_sg(void) | |
1638 | { | |
1639 | #ifdef CONFIG_SCSI_PROC_FS | |
1640 | sg_proc_cleanup(); | |
1641 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1642 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1643 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1644 | sg_sysfs_valid = 0; |
1645 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1646 | SG_MAX_DEVS); | |
7c07d613 | 1647 | idr_destroy(&sg_index_idr); |
1da177e4 LT |
1648 | } |
1649 | ||
10865dfa FT |
1650 | static int __sg_start_req(struct sg_request *srp, struct sg_io_hdr *hp, |
1651 | unsigned char *cmd) | |
1652 | { | |
1653 | struct sg_fd *sfp = srp->parentfp; | |
1654 | struct request_queue *q = sfp->parentdp->device->request_queue; | |
1655 | struct request *rq; | |
1656 | int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; | |
1657 | ||
1658 | rq = blk_get_request(q, rw, GFP_ATOMIC); | |
1659 | if (!rq) | |
1660 | return -ENOMEM; | |
1661 | ||
1662 | memcpy(rq->cmd, cmd, hp->cmd_len); | |
1663 | ||
1664 | rq->cmd_len = hp->cmd_len; | |
1665 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
1666 | ||
1667 | srp->rq = rq; | |
1668 | rq->end_io_data = srp; | |
1669 | rq->sense = srp->sense_b; | |
1670 | rq->retries = SG_DEFAULT_RETRIES; | |
1671 | ||
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | static int sg_start_req(Sg_request *srp, unsigned char *cmd) | |
1da177e4 LT |
1676 | { |
1677 | int res; | |
1678 | Sg_fd *sfp = srp->parentfp; | |
1679 | sg_io_hdr_t *hp = &srp->header; | |
1680 | int dxfer_len = (int) hp->dxfer_len; | |
1681 | int dxfer_dir = hp->dxfer_direction; | |
1682 | Sg_scatter_hold *req_schp = &srp->data; | |
1683 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1684 | ||
1685 | SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); | |
10865dfa | 1686 | |
1da177e4 | 1687 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) |
10865dfa FT |
1688 | return __sg_start_req(srp, hp, cmd); |
1689 | ||
1da177e4 LT |
1690 | if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && |
1691 | (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && | |
1692 | (!sfp->parentdp->device->host->unchecked_isa_dma)) { | |
1693 | res = sg_build_direct(srp, sfp, dxfer_len); | |
1694 | if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ | |
1695 | return res; | |
1696 | } | |
1697 | if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) | |
1698 | sg_link_reserve(sfp, srp, dxfer_len); | |
1699 | else { | |
1700 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1701 | if (res) { | |
1702 | sg_remove_scat(req_schp); | |
1703 | return res; | |
1704 | } | |
1705 | } | |
1706 | return 0; | |
1707 | } | |
1708 | ||
1709 | static void | |
1710 | sg_finish_rem_req(Sg_request * srp) | |
1711 | { | |
1712 | Sg_fd *sfp = srp->parentfp; | |
1713 | Sg_scatter_hold *req_schp = &srp->data; | |
1714 | ||
1715 | SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); | |
1716 | if (srp->res_used) | |
1717 | sg_unlink_reserve(sfp, srp); | |
1718 | else | |
1719 | sg_remove_scat(req_schp); | |
10865dfa FT |
1720 | |
1721 | if (srp->rq) | |
1722 | blk_put_request(srp->rq); | |
1723 | ||
1da177e4 LT |
1724 | sg_remove_request(sfp, srp); |
1725 | } | |
1726 | ||
1727 | static int | |
1728 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1729 | { | |
d6b10348 | 1730 | int sg_bufflen = tablesize * sizeof(struct scatterlist); |
2d20eaf9 | 1731 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 1732 | |
d6b10348 MC |
1733 | /* |
1734 | * TODO: test without low_dma, we should not need it since | |
1735 | * the block layer will bounce the buffer for us | |
1736 | * | |
1737 | * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. | |
1738 | */ | |
1739 | if (sfp->low_dma) | |
1740 | gfp_flags |= GFP_DMA; | |
1741 | schp->buffer = kzalloc(sg_bufflen, gfp_flags); | |
1da177e4 LT |
1742 | if (!schp->buffer) |
1743 | return -ENOMEM; | |
30fa0d0f | 1744 | sg_init_table(schp->buffer, tablesize); |
1da177e4 | 1745 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1746 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1747 | } |
1748 | ||
1749 | #ifdef SG_ALLOW_DIO_CODE | |
1750 | /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ | |
d6b10348 | 1751 | /* TODO: hopefully we can use the generic block layer code */ |
1da177e4 LT |
1752 | |
1753 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
1754 | - mapping of all pages not successful | |
1da177e4 LT |
1755 | (i.e., either completely successful or fails) |
1756 | */ | |
1757 | static int | |
1758 | st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
d6b10348 | 1759 | unsigned long uaddr, size_t count, int rw) |
1da177e4 | 1760 | { |
deb92b7e DG |
1761 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1762 | unsigned long start = uaddr >> PAGE_SHIFT; | |
1763 | const int nr_pages = end - start; | |
1da177e4 | 1764 | int res, i, j; |
1da177e4 LT |
1765 | struct page **pages; |
1766 | ||
1da177e4 LT |
1767 | /* User attempted Overflow! */ |
1768 | if ((uaddr + count) < uaddr) | |
1769 | return -EINVAL; | |
1770 | ||
1771 | /* Too big */ | |
1772 | if (nr_pages > max_pages) | |
1773 | return -ENOMEM; | |
1774 | ||
1775 | /* Hmm? */ | |
1776 | if (count == 0) | |
1777 | return 0; | |
1778 | ||
1779 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) | |
1780 | return -ENOMEM; | |
1781 | ||
1782 | /* Try to fault in all of the necessary pages */ | |
1783 | down_read(¤t->mm->mmap_sem); | |
1784 | /* rw==READ means read from drive, write into memory area */ | |
1785 | res = get_user_pages( | |
1786 | current, | |
1787 | current->mm, | |
1788 | uaddr, | |
1789 | nr_pages, | |
1790 | rw == READ, | |
1791 | 0, /* don't force */ | |
1792 | pages, | |
1793 | NULL); | |
1794 | up_read(¤t->mm->mmap_sem); | |
1795 | ||
1796 | /* Errors and no page mapped should return here */ | |
1797 | if (res < nr_pages) | |
1798 | goto out_unmap; | |
1799 | ||
1800 | for (i=0; i < nr_pages; i++) { | |
1801 | /* FIXME: flush superflous for rw==READ, | |
1802 | * probably wrong function for rw==WRITE | |
1803 | */ | |
1804 | flush_dcache_page(pages[i]); | |
1da177e4 | 1805 | /* ?? Is locking needed? I don't think so */ |
529ae9aa | 1806 | /* if (!trylock_page(pages[i])) |
1da177e4 LT |
1807 | goto out_unlock; */ |
1808 | } | |
1809 | ||
642f1490 | 1810 | sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK); |
1da177e4 LT |
1811 | if (nr_pages > 1) { |
1812 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
1813 | count -= sgl[0].length; | |
642f1490 JA |
1814 | for (i=1; i < nr_pages ; i++) |
1815 | sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0); | |
1da177e4 LT |
1816 | } |
1817 | else { | |
1818 | sgl[0].length = count; | |
1819 | } | |
1820 | ||
1821 | kfree(pages); | |
1822 | return nr_pages; | |
1823 | ||
1da177e4 | 1824 | out_unmap: |
4d5cda06 | 1825 | if (res > 0) { |
1da177e4 LT |
1826 | for (j=0; j < res; j++) |
1827 | page_cache_release(pages[j]); | |
4d5cda06 HD |
1828 | res = 0; |
1829 | } | |
1da177e4 LT |
1830 | kfree(pages); |
1831 | return res; | |
1832 | } | |
1833 | ||
1834 | ||
1835 | /* And unmap them... */ | |
1836 | static int | |
1837 | st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
1838 | int dirtied) | |
1839 | { | |
1840 | int i; | |
1841 | ||
1842 | for (i=0; i < nr_pages; i++) { | |
45711f1a | 1843 | struct page *page = sg_page(&sgl[i]); |
b5810039 | 1844 | |
b5810039 NP |
1845 | if (dirtied) |
1846 | SetPageDirty(page); | |
1847 | /* unlock_page(page); */ | |
1da177e4 LT |
1848 | /* FIXME: cache flush missing for rw==READ |
1849 | * FIXME: call the correct reference counting function | |
1850 | */ | |
b5810039 | 1851 | page_cache_release(page); |
1da177e4 LT |
1852 | } |
1853 | ||
1854 | return 0; | |
1855 | } | |
1856 | ||
1857 | /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ | |
1858 | #endif | |
1859 | ||
1860 | ||
1861 | /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ | |
1862 | static int | |
1863 | sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) | |
1864 | { | |
1865 | #ifdef SG_ALLOW_DIO_CODE | |
1866 | sg_io_hdr_t *hp = &srp->header; | |
1867 | Sg_scatter_hold *schp = &srp->data; | |
1868 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 LT |
1869 | int mx_sc_elems, res; |
1870 | struct scsi_device *sdev = sfp->parentdp->device; | |
1871 | ||
1872 | if (((unsigned long)hp->dxferp & | |
1873 | queue_dma_alignment(sdev->request_queue)) != 0) | |
1874 | return 1; | |
d6b10348 | 1875 | |
1da177e4 LT |
1876 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); |
1877 | if (mx_sc_elems <= 0) { | |
1878 | return 1; | |
1879 | } | |
d6b10348 MC |
1880 | res = st_map_user_pages(schp->buffer, mx_sc_elems, |
1881 | (unsigned long)hp->dxferp, dxfer_len, | |
1882 | (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); | |
c06bb7f5 DG |
1883 | if (res <= 0) { |
1884 | sg_remove_scat(schp); | |
1da177e4 | 1885 | return 1; |
c06bb7f5 | 1886 | } |
1da177e4 LT |
1887 | schp->k_use_sg = res; |
1888 | schp->dio_in_use = 1; | |
1889 | hp->info |= SG_INFO_DIRECT_IO; | |
1890 | return 0; | |
1891 | #else | |
1892 | return 1; | |
1893 | #endif | |
1894 | } | |
1895 | ||
1896 | static int | |
1897 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1898 | { | |
d6b10348 MC |
1899 | struct scatterlist *sg; |
1900 | int ret_sz = 0, k, rem_sz, num, mx_sc_elems; | |
1901 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 | 1902 | int blk_size = buff_size; |
d6b10348 | 1903 | struct page *p = NULL; |
1da177e4 | 1904 | |
fb119935 | 1905 | if (blk_size < 0) |
1da177e4 LT |
1906 | return -EFAULT; |
1907 | if (0 == blk_size) | |
1908 | ++blk_size; /* don't know why */ | |
1909 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ | |
1910 | blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); | |
1911 | SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1912 | buff_size, blk_size)); | |
d6b10348 MC |
1913 | |
1914 | /* N.B. ret_sz carried into this block ... */ | |
1915 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1916 | if (mx_sc_elems < 0) | |
1917 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1918 | ||
6460e75a DG |
1919 | num = scatter_elem_sz; |
1920 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1921 | if (num < PAGE_SIZE) { | |
1922 | scatter_elem_sz = PAGE_SIZE; | |
1923 | scatter_elem_sz_prev = PAGE_SIZE; | |
1924 | } else | |
1925 | scatter_elem_sz_prev = num; | |
1926 | } | |
d6b10348 MC |
1927 | for (k = 0, sg = schp->buffer, rem_sz = blk_size; |
1928 | (rem_sz > 0) && (k < mx_sc_elems); | |
b0f655d0 | 1929 | ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { |
d6b10348 | 1930 | |
6460e75a DG |
1931 | num = (rem_sz > scatter_elem_sz_prev) ? |
1932 | scatter_elem_sz_prev : rem_sz; | |
d6b10348 | 1933 | p = sg_page_malloc(num, sfp->low_dma, &ret_sz); |
1da177e4 LT |
1934 | if (!p) |
1935 | return -ENOMEM; | |
d6b10348 | 1936 | |
6460e75a DG |
1937 | if (num == scatter_elem_sz_prev) { |
1938 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1939 | scatter_elem_sz = ret_sz; | |
1940 | scatter_elem_sz_prev = ret_sz; | |
1941 | } | |
1942 | } | |
642f1490 | 1943 | sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0); |
d6b10348 | 1944 | |
7ca63cb4 DG |
1945 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " |
1946 | "ret_sz=%d\n", k, num, ret_sz)); | |
d6b10348 MC |
1947 | } /* end of for loop */ |
1948 | ||
1949 | schp->k_use_sg = k; | |
7ca63cb4 DG |
1950 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " |
1951 | "rem_sz=%d\n", k, rem_sz)); | |
d6b10348 MC |
1952 | |
1953 | schp->bufflen = blk_size; | |
1954 | if (rem_sz > 0) /* must have failed */ | |
1955 | return -ENOMEM; | |
1956 | ||
1da177e4 LT |
1957 | return 0; |
1958 | } | |
1959 | ||
1960 | static int | |
1961 | sg_write_xfer(Sg_request * srp) | |
1962 | { | |
1963 | sg_io_hdr_t *hp = &srp->header; | |
1964 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 1965 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
1966 | int num_xfer = 0; |
1967 | int j, k, onum, usglen, ksglen, res; | |
1968 | int iovec_count = (int) hp->iovec_count; | |
1969 | int dxfer_dir = hp->dxfer_direction; | |
1970 | unsigned char *p; | |
1971 | unsigned char __user *up; | |
1972 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
1973 | ||
1974 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || | |
1975 | (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
1976 | num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); | |
1977 | if (schp->bufflen < num_xfer) | |
1978 | num_xfer = schp->bufflen; | |
1979 | } | |
1980 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
1981 | (new_interface | |
1982 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
1983 | return 0; | |
1984 | ||
1985 | SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
1986 | num_xfer, iovec_count, schp->k_use_sg)); | |
1987 | if (iovec_count) { | |
1988 | onum = iovec_count; | |
1989 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
1990 | return -EFAULT; | |
1991 | } else | |
1992 | onum = 1; | |
1993 | ||
d6b10348 | 1994 | ksglen = sg->length; |
45711f1a | 1995 | p = page_address(sg_page(sg)); |
d6b10348 MC |
1996 | for (j = 0, k = 0; j < onum; ++j) { |
1997 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
1998 | if (res) | |
1999 | return res; | |
2000 | ||
b0f655d0 | 2001 | for (; p; sg = sg_next(sg), ksglen = sg->length, |
45711f1a | 2002 | p = page_address(sg_page(sg))) { |
d6b10348 MC |
2003 | if (usglen <= 0) |
2004 | break; | |
2005 | if (ksglen > usglen) { | |
2006 | if (usglen >= num_xfer) { | |
2007 | if (__copy_from_user(p, up, num_xfer)) | |
1da177e4 | 2008 | return -EFAULT; |
d6b10348 | 2009 | return 0; |
1da177e4 | 2010 | } |
d6b10348 MC |
2011 | if (__copy_from_user(p, up, usglen)) |
2012 | return -EFAULT; | |
2013 | p += usglen; | |
2014 | ksglen -= usglen; | |
2015 | break; | |
2016 | } else { | |
2017 | if (ksglen >= num_xfer) { | |
2018 | if (__copy_from_user(p, up, num_xfer)) | |
2019 | return -EFAULT; | |
1da177e4 | 2020 | return 0; |
d6b10348 MC |
2021 | } |
2022 | if (__copy_from_user(p, up, ksglen)) | |
2023 | return -EFAULT; | |
2024 | up += ksglen; | |
2025 | usglen -= ksglen; | |
1da177e4 | 2026 | } |
d6b10348 MC |
2027 | ++k; |
2028 | if (k >= schp->k_use_sg) | |
2029 | return 0; | |
1da177e4 LT |
2030 | } |
2031 | } | |
d6b10348 | 2032 | |
1da177e4 LT |
2033 | return 0; |
2034 | } | |
2035 | ||
2036 | static int | |
2037 | sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
2038 | int wr_xf, int *countp, unsigned char __user **up) | |
2039 | { | |
2040 | int num_xfer = (int) hp->dxfer_len; | |
2041 | unsigned char __user *p = hp->dxferp; | |
2042 | int count; | |
2043 | ||
2044 | if (0 == sg_num) { | |
2045 | if (wr_xf && ('\0' == hp->interface_id)) | |
2046 | count = (int) hp->flags; /* holds "old" input_size */ | |
2047 | else | |
2048 | count = num_xfer; | |
2049 | } else { | |
2050 | sg_iovec_t iovec; | |
2051 | if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) | |
2052 | return -EFAULT; | |
2053 | p = iovec.iov_base; | |
2054 | count = (int) iovec.iov_len; | |
2055 | } | |
2056 | if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) | |
2057 | return -EFAULT; | |
2058 | if (up) | |
2059 | *up = p; | |
2060 | if (countp) | |
2061 | *countp = count; | |
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | static void | |
2066 | sg_remove_scat(Sg_scatter_hold * schp) | |
2067 | { | |
2068 | SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
2069 | if (schp->buffer && (schp->sglist_len > 0)) { | |
d6b10348 | 2070 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2071 | |
2072 | if (schp->dio_in_use) { | |
2073 | #ifdef SG_ALLOW_DIO_CODE | |
d6b10348 | 2074 | st_unmap_user_pages(sg, schp->k_use_sg, TRUE); |
1da177e4 LT |
2075 | #endif |
2076 | } else { | |
2077 | int k; | |
2078 | ||
45711f1a | 2079 | for (k = 0; (k < schp->k_use_sg) && sg_page(sg); |
b0f655d0 | 2080 | ++k, sg = sg_next(sg)) { |
1da177e4 | 2081 | SCSI_LOG_TIMEOUT(5, printk( |
7ca63cb4 | 2082 | "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", |
45711f1a JA |
2083 | k, sg_page(sg), sg->length)); |
2084 | sg_page_free(sg_page(sg), sg->length); | |
1da177e4 LT |
2085 | } |
2086 | } | |
d6b10348 MC |
2087 | kfree(schp->buffer); |
2088 | } | |
1da177e4 LT |
2089 | memset(schp, 0, sizeof (*schp)); |
2090 | } | |
2091 | ||
2092 | static int | |
2093 | sg_read_xfer(Sg_request * srp) | |
2094 | { | |
2095 | sg_io_hdr_t *hp = &srp->header; | |
2096 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 2097 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2098 | int num_xfer = 0; |
2099 | int j, k, onum, usglen, ksglen, res; | |
2100 | int iovec_count = (int) hp->iovec_count; | |
2101 | int dxfer_dir = hp->dxfer_direction; | |
2102 | unsigned char *p; | |
2103 | unsigned char __user *up; | |
2104 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2105 | ||
2106 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) | |
2107 | || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2108 | num_xfer = hp->dxfer_len; | |
2109 | if (schp->bufflen < num_xfer) | |
2110 | num_xfer = schp->bufflen; | |
2111 | } | |
2112 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2113 | (new_interface | |
2114 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2115 | return 0; | |
2116 | ||
2117 | SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2118 | num_xfer, iovec_count, schp->k_use_sg)); | |
2119 | if (iovec_count) { | |
2120 | onum = iovec_count; | |
2121 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2122 | return -EFAULT; | |
2123 | } else | |
2124 | onum = 1; | |
2125 | ||
45711f1a | 2126 | p = page_address(sg_page(sg)); |
d6b10348 MC |
2127 | ksglen = sg->length; |
2128 | for (j = 0, k = 0; j < onum; ++j) { | |
2129 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2130 | if (res) | |
2131 | return res; | |
2132 | ||
b0f655d0 | 2133 | for (; p; sg = sg_next(sg), ksglen = sg->length, |
45711f1a | 2134 | p = page_address(sg_page(sg))) { |
d6b10348 MC |
2135 | if (usglen <= 0) |
2136 | break; | |
2137 | if (ksglen > usglen) { | |
2138 | if (usglen >= num_xfer) { | |
2139 | if (__copy_to_user(up, p, num_xfer)) | |
1da177e4 | 2140 | return -EFAULT; |
d6b10348 | 2141 | return 0; |
1da177e4 | 2142 | } |
d6b10348 MC |
2143 | if (__copy_to_user(up, p, usglen)) |
2144 | return -EFAULT; | |
2145 | p += usglen; | |
2146 | ksglen -= usglen; | |
2147 | break; | |
2148 | } else { | |
2149 | if (ksglen >= num_xfer) { | |
2150 | if (__copy_to_user(up, p, num_xfer)) | |
2151 | return -EFAULT; | |
1da177e4 | 2152 | return 0; |
d6b10348 MC |
2153 | } |
2154 | if (__copy_to_user(up, p, ksglen)) | |
2155 | return -EFAULT; | |
2156 | up += ksglen; | |
2157 | usglen -= ksglen; | |
1da177e4 | 2158 | } |
d6b10348 MC |
2159 | ++k; |
2160 | if (k >= schp->k_use_sg) | |
2161 | return 0; | |
1da177e4 LT |
2162 | } |
2163 | } | |
d6b10348 | 2164 | |
1da177e4 LT |
2165 | return 0; |
2166 | } | |
2167 | ||
2168 | static int | |
2169 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
2170 | { | |
2171 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 MC |
2172 | struct scatterlist *sg = schp->buffer; |
2173 | int k, num; | |
1da177e4 LT |
2174 | |
2175 | SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", | |
2176 | num_read_xfer)); | |
2177 | if ((!outp) || (num_read_xfer <= 0)) | |
2178 | return 0; | |
d6b10348 | 2179 | |
45711f1a | 2180 | for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) { |
d6b10348 MC |
2181 | num = sg->length; |
2182 | if (num > num_read_xfer) { | |
45711f1a | 2183 | if (__copy_to_user(outp, page_address(sg_page(sg)), |
d6b10348 MC |
2184 | num_read_xfer)) |
2185 | return -EFAULT; | |
2186 | break; | |
2187 | } else { | |
45711f1a | 2188 | if (__copy_to_user(outp, page_address(sg_page(sg)), |
d6b10348 MC |
2189 | num)) |
2190 | return -EFAULT; | |
2191 | num_read_xfer -= num; | |
2192 | if (num_read_xfer <= 0) | |
1da177e4 | 2193 | break; |
d6b10348 | 2194 | outp += num; |
1da177e4 | 2195 | } |
1da177e4 | 2196 | } |
d6b10348 | 2197 | |
1da177e4 LT |
2198 | return 0; |
2199 | } | |
2200 | ||
2201 | static void | |
2202 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2203 | { | |
2204 | Sg_scatter_hold *schp = &sfp->reserve; | |
2205 | ||
2206 | SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); | |
2207 | do { | |
2208 | if (req_size < PAGE_SIZE) | |
2209 | req_size = PAGE_SIZE; | |
2210 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2211 | return; | |
2212 | else | |
2213 | sg_remove_scat(schp); | |
2214 | req_size >>= 1; /* divide by 2 */ | |
2215 | } while (req_size > (PAGE_SIZE / 2)); | |
2216 | } | |
2217 | ||
2218 | static void | |
2219 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2220 | { | |
2221 | Sg_scatter_hold *req_schp = &srp->data; | |
2222 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 MC |
2223 | struct scatterlist *sg = rsv_schp->buffer; |
2224 | int k, num, rem; | |
1da177e4 LT |
2225 | |
2226 | srp->res_used = 1; | |
2227 | SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); | |
eca7be5e | 2228 | rem = size; |
d6b10348 | 2229 | |
b0f655d0 | 2230 | for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { |
d6b10348 MC |
2231 | num = sg->length; |
2232 | if (rem <= num) { | |
2233 | sfp->save_scat_len = num; | |
2234 | sg->length = rem; | |
2235 | req_schp->k_use_sg = k + 1; | |
2236 | req_schp->sglist_len = rsv_schp->sglist_len; | |
2237 | req_schp->buffer = rsv_schp->buffer; | |
2238 | ||
2239 | req_schp->bufflen = size; | |
2240 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2241 | break; | |
2242 | } else | |
2243 | rem -= num; | |
1da177e4 | 2244 | } |
d6b10348 MC |
2245 | |
2246 | if (k >= rsv_schp->k_use_sg) | |
2247 | SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
2248 | } |
2249 | ||
2250 | static void | |
2251 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2252 | { | |
2253 | Sg_scatter_hold *req_schp = &srp->data; | |
2254 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2255 | ||
2256 | SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", | |
2257 | (int) req_schp->k_use_sg)); | |
2258 | if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { | |
d6b10348 | 2259 | struct scatterlist *sg = rsv_schp->buffer; |
1da177e4 LT |
2260 | |
2261 | if (sfp->save_scat_len > 0) | |
d6b10348 | 2262 | (sg + (req_schp->k_use_sg - 1))->length = |
1da177e4 LT |
2263 | (unsigned) sfp->save_scat_len; |
2264 | else | |
2265 | SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); | |
2266 | } | |
2267 | req_schp->k_use_sg = 0; | |
2268 | req_schp->bufflen = 0; | |
2269 | req_schp->buffer = NULL; | |
2270 | req_schp->sglist_len = 0; | |
2271 | sfp->save_scat_len = 0; | |
2272 | srp->res_used = 0; | |
2273 | } | |
2274 | ||
2275 | static Sg_request * | |
2276 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2277 | { | |
2278 | Sg_request *resp; | |
2279 | unsigned long iflags; | |
2280 | ||
2281 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2282 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2283 | /* look for requests that are ready + not SG_IO owned */ | |
2284 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2285 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2286 | resp->done = 2; /* guard against other readers */ | |
2287 | break; | |
2288 | } | |
2289 | } | |
2290 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2291 | return resp; | |
2292 | } | |
2293 | ||
2294 | #ifdef CONFIG_SCSI_PROC_FS | |
2295 | static Sg_request * | |
2296 | sg_get_nth_request(Sg_fd * sfp, int nth) | |
2297 | { | |
2298 | Sg_request *resp; | |
2299 | unsigned long iflags; | |
2300 | int k; | |
2301 | ||
2302 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2303 | for (k = 0, resp = sfp->headrp; resp && (k < nth); | |
2304 | ++k, resp = resp->nextrp) ; | |
2305 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2306 | return resp; | |
2307 | } | |
2308 | #endif | |
2309 | ||
2310 | /* always adds to end of list */ | |
2311 | static Sg_request * | |
2312 | sg_add_request(Sg_fd * sfp) | |
2313 | { | |
2314 | int k; | |
2315 | unsigned long iflags; | |
2316 | Sg_request *resp; | |
2317 | Sg_request *rp = sfp->req_arr; | |
2318 | ||
2319 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2320 | resp = sfp->headrp; | |
2321 | if (!resp) { | |
2322 | memset(rp, 0, sizeof (Sg_request)); | |
2323 | rp->parentfp = sfp; | |
2324 | resp = rp; | |
2325 | sfp->headrp = resp; | |
2326 | } else { | |
2327 | if (0 == sfp->cmd_q) | |
2328 | resp = NULL; /* command queuing disallowed */ | |
2329 | else { | |
2330 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2331 | if (!rp->parentfp) | |
2332 | break; | |
2333 | } | |
2334 | if (k < SG_MAX_QUEUE) { | |
2335 | memset(rp, 0, sizeof (Sg_request)); | |
2336 | rp->parentfp = sfp; | |
2337 | while (resp->nextrp) | |
2338 | resp = resp->nextrp; | |
2339 | resp->nextrp = rp; | |
2340 | resp = rp; | |
2341 | } else | |
2342 | resp = NULL; | |
2343 | } | |
2344 | } | |
2345 | if (resp) { | |
2346 | resp->nextrp = NULL; | |
cb59e840 | 2347 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
2348 | } |
2349 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2350 | return resp; | |
2351 | } | |
2352 | ||
2353 | /* Return of 1 for found; 0 for not found */ | |
2354 | static int | |
2355 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2356 | { | |
2357 | Sg_request *prev_rp; | |
2358 | Sg_request *rp; | |
2359 | unsigned long iflags; | |
2360 | int res = 0; | |
2361 | ||
2362 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2363 | return res; | |
2364 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2365 | prev_rp = sfp->headrp; | |
2366 | if (srp == prev_rp) { | |
2367 | sfp->headrp = prev_rp->nextrp; | |
2368 | prev_rp->parentfp = NULL; | |
2369 | res = 1; | |
2370 | } else { | |
2371 | while ((rp = prev_rp->nextrp)) { | |
2372 | if (srp == rp) { | |
2373 | prev_rp->nextrp = rp->nextrp; | |
2374 | rp->parentfp = NULL; | |
2375 | res = 1; | |
2376 | break; | |
2377 | } | |
2378 | prev_rp = rp; | |
2379 | } | |
2380 | } | |
2381 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2382 | return res; | |
2383 | } | |
2384 | ||
2385 | #ifdef CONFIG_SCSI_PROC_FS | |
2386 | static Sg_fd * | |
2387 | sg_get_nth_sfp(Sg_device * sdp, int nth) | |
2388 | { | |
2389 | Sg_fd *resp; | |
2390 | unsigned long iflags; | |
2391 | int k; | |
2392 | ||
7c07d613 | 2393 | read_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2394 | for (k = 0, resp = sdp->headfp; resp && (k < nth); |
2395 | ++k, resp = resp->nextfp) ; | |
7c07d613 | 2396 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2397 | return resp; |
2398 | } | |
2399 | #endif | |
2400 | ||
2401 | static Sg_fd * | |
2402 | sg_add_sfp(Sg_device * sdp, int dev) | |
2403 | { | |
2404 | Sg_fd *sfp; | |
2405 | unsigned long iflags; | |
44ec9542 | 2406 | int bufflen; |
1da177e4 | 2407 | |
d6b10348 | 2408 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 LT |
2409 | if (!sfp) |
2410 | return NULL; | |
d6b10348 | 2411 | |
1da177e4 LT |
2412 | init_waitqueue_head(&sfp->read_wait); |
2413 | rwlock_init(&sfp->rq_list_lock); | |
2414 | ||
2415 | sfp->timeout = SG_DEFAULT_TIMEOUT; | |
2416 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2417 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2418 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2419 | sdp->device->host->unchecked_isa_dma : 1; | |
2420 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2421 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2422 | sfp->parentdp = sdp; | |
7c07d613 | 2423 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2424 | if (!sdp->headfp) |
2425 | sdp->headfp = sfp; | |
2426 | else { /* add to tail of existing list */ | |
2427 | Sg_fd *pfp = sdp->headfp; | |
2428 | while (pfp->nextfp) | |
2429 | pfp = pfp->nextfp; | |
2430 | pfp->nextfp = sfp; | |
2431 | } | |
7c07d613 | 2432 | write_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 | 2433 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); |
6460e75a DG |
2434 | if (unlikely(sg_big_buff != def_reserved_size)) |
2435 | sg_big_buff = def_reserved_size; | |
2436 | ||
44ec9542 AS |
2437 | bufflen = min_t(int, sg_big_buff, |
2438 | sdp->device->request_queue->max_sectors * 512); | |
2439 | sg_build_reserve(sfp, bufflen); | |
1da177e4 LT |
2440 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", |
2441 | sfp->reserve.bufflen, sfp->reserve.k_use_sg)); | |
2442 | return sfp; | |
2443 | } | |
2444 | ||
2445 | static void | |
2446 | __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2447 | { | |
2448 | Sg_fd *fp; | |
2449 | Sg_fd *prev_fp; | |
2450 | ||
2451 | prev_fp = sdp->headfp; | |
2452 | if (sfp == prev_fp) | |
2453 | sdp->headfp = prev_fp->nextfp; | |
2454 | else { | |
2455 | while ((fp = prev_fp->nextfp)) { | |
2456 | if (sfp == fp) { | |
2457 | prev_fp->nextfp = fp->nextfp; | |
2458 | break; | |
2459 | } | |
2460 | prev_fp = fp; | |
2461 | } | |
2462 | } | |
2463 | if (sfp->reserve.bufflen > 0) { | |
2464 | SCSI_LOG_TIMEOUT(6, | |
2465 | printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2466 | (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); | |
1da177e4 LT |
2467 | sg_remove_scat(&sfp->reserve); |
2468 | } | |
2469 | sfp->parentdp = NULL; | |
2470 | SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); | |
d6b10348 | 2471 | kfree(sfp); |
1da177e4 LT |
2472 | } |
2473 | ||
2474 | /* Returns 0 in normal case, 1 when detached and sdp object removed */ | |
2475 | static int | |
2476 | sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2477 | { | |
2478 | Sg_request *srp; | |
2479 | Sg_request *tsrp; | |
2480 | int dirty = 0; | |
2481 | int res = 0; | |
2482 | ||
2483 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
2484 | tsrp = srp->nextrp; | |
2485 | if (sg_srp_done(srp, sfp)) | |
2486 | sg_finish_rem_req(srp); | |
2487 | else | |
2488 | ++dirty; | |
2489 | } | |
2490 | if (0 == dirty) { | |
2491 | unsigned long iflags; | |
2492 | ||
7c07d613 | 2493 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2494 | __sg_remove_sfp(sdp, sfp); |
2495 | if (sdp->detached && (NULL == sdp->headfp)) { | |
7c07d613 JB |
2496 | idr_remove(&sg_index_idr, sdp->index); |
2497 | kfree(sdp); | |
1da177e4 LT |
2498 | res = 1; |
2499 | } | |
7c07d613 | 2500 | write_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2501 | } else { |
2502 | /* MOD_INC's to inhibit unloading sg and associated adapter driver */ | |
2503 | /* only bump the access_count if we actually succeeded in | |
2504 | * throwing another counter on the host module */ | |
2505 | scsi_device_get(sdp->device); /* XXX: retval ignored? */ | |
2506 | sfp->closed = 1; /* flag dirty state on this fd */ | |
2507 | SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", | |
2508 | dirty)); | |
2509 | } | |
2510 | return res; | |
2511 | } | |
2512 | ||
2513 | static int | |
2514 | sg_res_in_use(Sg_fd * sfp) | |
2515 | { | |
2516 | const Sg_request *srp; | |
2517 | unsigned long iflags; | |
2518 | ||
2519 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2520 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2521 | if (srp->res_used) | |
2522 | break; | |
2523 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2524 | return srp ? 1 : 0; | |
2525 | } | |
2526 | ||
6460e75a | 2527 | /* The size fetched (value output via retSzp) set when non-NULL return */ |
d6b10348 | 2528 | static struct page * |
1da177e4 LT |
2529 | sg_page_malloc(int rqSz, int lowDma, int *retSzp) |
2530 | { | |
d6b10348 | 2531 | struct page *resp = NULL; |
c53033f6 | 2532 | gfp_t page_mask; |
1da177e4 | 2533 | int order, a_size; |
6460e75a | 2534 | int resSz; |
1da177e4 | 2535 | |
6460e75a | 2536 | if ((rqSz <= 0) || (NULL == retSzp)) |
1da177e4 LT |
2537 | return resp; |
2538 | ||
2539 | if (lowDma) | |
f9aed0e2 | 2540 | page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; |
1da177e4 | 2541 | else |
f9aed0e2 | 2542 | page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; |
1da177e4 LT |
2543 | |
2544 | for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; | |
2545 | order++, a_size <<= 1) ; | |
6460e75a | 2546 | resSz = a_size; /* rounded up if necessary */ |
d6b10348 | 2547 | resp = alloc_pages(page_mask, order); |
6460e75a | 2548 | while ((!resp) && order) { |
1da177e4 LT |
2549 | --order; |
2550 | a_size >>= 1; /* divide by 2, until PAGE_SIZE */ | |
d6b10348 | 2551 | resp = alloc_pages(page_mask, order); /* try half */ |
1da177e4 LT |
2552 | resSz = a_size; |
2553 | } | |
2554 | if (resp) { | |
2555 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
41ed16fa | 2556 | memset(page_address(resp), 0, resSz); |
6460e75a | 2557 | *retSzp = resSz; |
1da177e4 LT |
2558 | } |
2559 | return resp; | |
2560 | } | |
2561 | ||
2562 | static void | |
d6b10348 | 2563 | sg_page_free(struct page *page, int size) |
1da177e4 LT |
2564 | { |
2565 | int order, a_size; | |
2566 | ||
d6b10348 | 2567 | if (!page) |
1da177e4 LT |
2568 | return; |
2569 | for (order = 0, a_size = PAGE_SIZE; a_size < size; | |
2570 | order++, a_size <<= 1) ; | |
d6b10348 | 2571 | __free_pages(page, order); |
1da177e4 LT |
2572 | } |
2573 | ||
1da177e4 | 2574 | #ifdef CONFIG_SCSI_PROC_FS |
7c07d613 JB |
2575 | static int |
2576 | sg_idr_max_id(int id, void *p, void *data) | |
2577 | { | |
2578 | int *k = data; | |
2579 | ||
2580 | if (*k < id) | |
2581 | *k = id; | |
2582 | ||
2583 | return 0; | |
2584 | } | |
2585 | ||
1da177e4 LT |
2586 | static int |
2587 | sg_last_dev(void) | |
2588 | { | |
53474c04 | 2589 | int k = -1; |
1da177e4 LT |
2590 | unsigned long iflags; |
2591 | ||
7c07d613 JB |
2592 | read_lock_irqsave(&sg_index_lock, iflags); |
2593 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2594 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 LT |
2595 | return k + 1; /* origin 1 */ |
2596 | } | |
2597 | #endif | |
2598 | ||
2599 | static Sg_device * | |
2600 | sg_get_dev(int dev) | |
2601 | { | |
7c07d613 | 2602 | Sg_device *sdp; |
1da177e4 LT |
2603 | unsigned long iflags; |
2604 | ||
7c07d613 JB |
2605 | read_lock_irqsave(&sg_index_lock, iflags); |
2606 | sdp = idr_find(&sg_index_idr, dev); | |
2607 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
2608 | ||
1da177e4 LT |
2609 | return sdp; |
2610 | } | |
2611 | ||
2612 | #ifdef CONFIG_SCSI_PROC_FS | |
2613 | ||
2614 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2615 | ||
2616 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2617 | ||
2618 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2619 | ||
2620 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2621 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2622 | size_t count, loff_t *off); | |
2623 | static struct file_operations adio_fops = { | |
2624 | /* .owner, .read and .llseek added in sg_proc_init() */ | |
2625 | .open = sg_proc_single_open_adio, | |
2626 | .write = sg_proc_write_adio, | |
2627 | .release = single_release, | |
2628 | }; | |
2629 | ||
2630 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2631 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2632 | const char __user *buffer, size_t count, loff_t *off); | |
2633 | static struct file_operations dressz_fops = { | |
2634 | .open = sg_proc_single_open_dressz, | |
2635 | .write = sg_proc_write_dressz, | |
2636 | .release = single_release, | |
2637 | }; | |
2638 | ||
2639 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2640 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
2641 | static struct file_operations version_fops = { | |
2642 | .open = sg_proc_single_open_version, | |
2643 | .release = single_release, | |
2644 | }; | |
2645 | ||
2646 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2647 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
2648 | static struct file_operations devhdr_fops = { | |
2649 | .open = sg_proc_single_open_devhdr, | |
2650 | .release = single_release, | |
2651 | }; | |
2652 | ||
2653 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2654 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2655 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2656 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2657 | static void dev_seq_stop(struct seq_file *s, void *v); | |
2658 | static struct file_operations dev_fops = { | |
2659 | .open = sg_proc_open_dev, | |
2660 | .release = seq_release, | |
2661 | }; | |
2662 | static struct seq_operations dev_seq_ops = { | |
2663 | .start = dev_seq_start, | |
2664 | .next = dev_seq_next, | |
2665 | .stop = dev_seq_stop, | |
2666 | .show = sg_proc_seq_show_dev, | |
2667 | }; | |
2668 | ||
2669 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2670 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
2671 | static struct file_operations devstrs_fops = { | |
2672 | .open = sg_proc_open_devstrs, | |
2673 | .release = seq_release, | |
2674 | }; | |
2675 | static struct seq_operations devstrs_seq_ops = { | |
2676 | .start = dev_seq_start, | |
2677 | .next = dev_seq_next, | |
2678 | .stop = dev_seq_stop, | |
2679 | .show = sg_proc_seq_show_devstrs, | |
2680 | }; | |
2681 | ||
2682 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2683 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
2684 | static struct file_operations debug_fops = { | |
2685 | .open = sg_proc_open_debug, | |
2686 | .release = seq_release, | |
2687 | }; | |
2688 | static struct seq_operations debug_seq_ops = { | |
2689 | .start = dev_seq_start, | |
2690 | .next = dev_seq_next, | |
2691 | .stop = dev_seq_stop, | |
2692 | .show = sg_proc_seq_show_debug, | |
2693 | }; | |
2694 | ||
2695 | ||
2696 | struct sg_proc_leaf { | |
2697 | const char * name; | |
2698 | struct file_operations * fops; | |
2699 | }; | |
2700 | ||
2701 | static struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2702 | {"allow_dio", &adio_fops}, | |
2703 | {"debug", &debug_fops}, | |
2704 | {"def_reserved_size", &dressz_fops}, | |
2705 | {"device_hdr", &devhdr_fops}, | |
2706 | {"devices", &dev_fops}, | |
2707 | {"device_strs", &devstrs_fops}, | |
2708 | {"version", &version_fops} | |
2709 | }; | |
2710 | ||
2711 | static int | |
2712 | sg_proc_init(void) | |
2713 | { | |
2714 | int k, mask; | |
6391a113 | 2715 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2716 | struct sg_proc_leaf * leaf; |
2717 | ||
66600221 | 2718 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2719 | if (!sg_proc_sgp) |
2720 | return 1; | |
2721 | for (k = 0; k < num_leaves; ++k) { | |
2722 | leaf = &sg_proc_leaf_arr[k]; | |
2723 | mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
a973909f DL |
2724 | leaf->fops->owner = THIS_MODULE; |
2725 | leaf->fops->read = seq_read; | |
2726 | leaf->fops->llseek = seq_lseek; | |
2727 | proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); | |
1da177e4 LT |
2728 | } |
2729 | return 0; | |
2730 | } | |
2731 | ||
2732 | static void | |
2733 | sg_proc_cleanup(void) | |
2734 | { | |
2735 | int k; | |
6391a113 | 2736 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2737 | |
2738 | if (!sg_proc_sgp) | |
2739 | return; | |
2740 | for (k = 0; k < num_leaves; ++k) | |
2741 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2742 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2743 | } | |
2744 | ||
2745 | ||
2746 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2747 | { | |
2748 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2749 | return 0; | |
2750 | } | |
2751 | ||
2752 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2753 | { | |
2754 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2755 | } | |
2756 | ||
2757 | static ssize_t | |
2758 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2759 | size_t count, loff_t *off) | |
2760 | { | |
2761 | int num; | |
2762 | char buff[11]; | |
2763 | ||
2764 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2765 | return -EACCES; | |
2766 | num = (count < 10) ? count : 10; | |
2767 | if (copy_from_user(buff, buffer, num)) | |
2768 | return -EFAULT; | |
2769 | buff[num] = '\0'; | |
2770 | sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; | |
2771 | return count; | |
2772 | } | |
2773 | ||
2774 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2775 | { | |
2776 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2777 | } | |
2778 | ||
2779 | static ssize_t | |
2780 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2781 | size_t count, loff_t *off) | |
2782 | { | |
2783 | int num; | |
2784 | unsigned long k = ULONG_MAX; | |
2785 | char buff[11]; | |
2786 | ||
2787 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2788 | return -EACCES; | |
2789 | num = (count < 10) ? count : 10; | |
2790 | if (copy_from_user(buff, buffer, num)) | |
2791 | return -EFAULT; | |
2792 | buff[num] = '\0'; | |
2793 | k = simple_strtoul(buff, NULL, 10); | |
2794 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2795 | sg_big_buff = k; | |
2796 | return count; | |
2797 | } | |
2798 | return -ERANGE; | |
2799 | } | |
2800 | ||
2801 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2802 | { | |
2803 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2804 | sg_version_date); | |
2805 | return 0; | |
2806 | } | |
2807 | ||
2808 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2809 | { | |
2810 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2811 | } | |
2812 | ||
2813 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2814 | { | |
2815 | seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" | |
2816 | "online\n"); | |
2817 | return 0; | |
2818 | } | |
2819 | ||
2820 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2821 | { | |
2822 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2823 | } | |
2824 | ||
2825 | struct sg_proc_deviter { | |
2826 | loff_t index; | |
2827 | size_t max; | |
2828 | }; | |
2829 | ||
2830 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2831 | { | |
2832 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2833 | ||
729d70f5 | 2834 | s->private = it; |
1da177e4 LT |
2835 | if (! it) |
2836 | return NULL; | |
729d70f5 | 2837 | |
1da177e4 LT |
2838 | it->index = *pos; |
2839 | it->max = sg_last_dev(); | |
2840 | if (it->index >= it->max) | |
729d70f5 | 2841 | return NULL; |
1da177e4 | 2842 | return it; |
1da177e4 LT |
2843 | } |
2844 | ||
2845 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2846 | { | |
729d70f5 | 2847 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2848 | |
2849 | *pos = ++it->index; | |
2850 | return (it->index < it->max) ? it : NULL; | |
2851 | } | |
2852 | ||
2853 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2854 | { | |
729d70f5 | 2855 | kfree(s->private); |
1da177e4 LT |
2856 | } |
2857 | ||
2858 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2859 | { | |
2860 | return seq_open(file, &dev_seq_ops); | |
2861 | } | |
2862 | ||
2863 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2864 | { | |
2865 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2866 | Sg_device *sdp; | |
2867 | struct scsi_device *scsidp; | |
2868 | ||
2869 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2870 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2871 | seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", | |
2872 | scsidp->host->host_no, scsidp->channel, | |
2873 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2874 | 1, | |
2875 | (int) scsidp->queue_depth, | |
2876 | (int) scsidp->device_busy, | |
2877 | (int) scsi_device_online(scsidp)); | |
2878 | else | |
2879 | seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2880 | return 0; | |
2881 | } | |
2882 | ||
2883 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
2884 | { | |
2885 | return seq_open(file, &devstrs_seq_ops); | |
2886 | } | |
2887 | ||
2888 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
2889 | { | |
2890 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2891 | Sg_device *sdp; | |
2892 | struct scsi_device *scsidp; | |
2893 | ||
2894 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2895 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2896 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
2897 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2898 | else | |
2899 | seq_printf(s, "<no active device>\n"); | |
2900 | return 0; | |
2901 | } | |
2902 | ||
2903 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) | |
2904 | { | |
2905 | int k, m, new_interface, blen, usg; | |
2906 | Sg_request *srp; | |
2907 | Sg_fd *fp; | |
2908 | const sg_io_hdr_t *hp; | |
2909 | const char * cp; | |
cb59e840 | 2910 | unsigned int ms; |
1da177e4 LT |
2911 | |
2912 | for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { | |
2913 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " | |
2914 | "(res)sgat=%d low_dma=%d\n", k + 1, | |
2915 | jiffies_to_msecs(fp->timeout), | |
2916 | fp->reserve.bufflen, | |
2917 | (int) fp->reserve.k_use_sg, | |
2918 | (int) fp->low_dma); | |
2919 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", | |
2920 | (int) fp->cmd_q, (int) fp->force_packid, | |
2921 | (int) fp->keep_orphan, (int) fp->closed); | |
2922 | for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { | |
2923 | hp = &srp->header; | |
2924 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2925 | if (srp->res_used) { | |
2926 | if (new_interface && | |
2927 | (SG_FLAG_MMAP_IO & hp->flags)) | |
2928 | cp = " mmap>> "; | |
2929 | else | |
2930 | cp = " rb>> "; | |
2931 | } else { | |
2932 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2933 | cp = " dio>> "; | |
2934 | else | |
2935 | cp = " "; | |
2936 | } | |
2937 | seq_printf(s, cp); | |
d6b10348 MC |
2938 | blen = srp->data.bufflen; |
2939 | usg = srp->data.k_use_sg; | |
1da177e4 LT |
2940 | seq_printf(s, srp->done ? |
2941 | ((1 == srp->done) ? "rcv:" : "fin:") | |
d6b10348 | 2942 | : "act:"); |
1da177e4 LT |
2943 | seq_printf(s, " id=%d blen=%d", |
2944 | srp->header.pack_id, blen); | |
2945 | if (srp->done) | |
2946 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 DG |
2947 | else { |
2948 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2949 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 DG |
2950 | (new_interface ? hp->timeout : |
2951 | jiffies_to_msecs(fp->timeout)), | |
2952 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2953 | } | |
1da177e4 LT |
2954 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2955 | (int) srp->data.cmd_opcode); | |
2956 | } | |
2957 | if (0 == m) | |
2958 | seq_printf(s, " No requests active\n"); | |
2959 | } | |
2960 | } | |
2961 | ||
2962 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
2963 | { | |
2964 | return seq_open(file, &debug_seq_ops); | |
2965 | } | |
2966 | ||
2967 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
2968 | { | |
2969 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2970 | Sg_device *sdp; | |
2971 | ||
2972 | if (it && (0 == it->index)) { | |
7c07d613 JB |
2973 | seq_printf(s, "max_active_device=%d(origin 1)\n", |
2974 | (int)it->max); | |
1da177e4 LT |
2975 | seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); |
2976 | } | |
2977 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2978 | if (sdp) { | |
2979 | struct scsi_device *scsidp = sdp->device; | |
2980 | ||
2981 | if (NULL == scsidp) { | |
2982 | seq_printf(s, "device %d detached ??\n", | |
2983 | (int)it->index); | |
2984 | return 0; | |
2985 | } | |
2986 | ||
2987 | if (sg_get_nth_sfp(sdp, 0)) { | |
2988 | seq_printf(s, " >>> device=%s ", | |
2989 | sdp->disk->disk_name); | |
2990 | if (sdp->detached) | |
2991 | seq_printf(s, "detached pending close "); | |
2992 | else | |
2993 | seq_printf | |
2994 | (s, "scsi%d chan=%d id=%d lun=%d em=%d", | |
2995 | scsidp->host->host_no, | |
2996 | scsidp->channel, scsidp->id, | |
2997 | scsidp->lun, | |
2998 | scsidp->host->hostt->emulated); | |
2999 | seq_printf(s, " sg_tablesize=%d excl=%d\n", | |
3000 | sdp->sg_tablesize, sdp->exclude); | |
3001 | } | |
3002 | sg_proc_debug_helper(s, sdp); | |
3003 | } | |
3004 | return 0; | |
3005 | } | |
3006 | ||
3007 | #endif /* CONFIG_SCSI_PROC_FS */ | |
3008 | ||
3009 | module_init(init_sg); | |
3010 | module_exit(exit_sg); |