Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * History: | |
3 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), | |
4 | * to allow user process control of SCSI devices. | |
5 | * Development Sponsored by Killy Corp. NY NY | |
6 | * | |
7 | * Original driver (sg.c): | |
8 | * Copyright (C) 1992 Lawrence Foard | |
9 | * Version 2 and 3 extensions to driver: | |
10 | * Copyright (C) 1998 - 2005 Douglas Gilbert | |
11 | * | |
12 | * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | ||
b2155d04 DG |
21 | static int sg_version_num = 30534; /* 2 digits for each component */ |
22 | #define SG_VERSION_STR "3.5.34" | |
1da177e4 LT |
23 | |
24 | /* | |
25 | * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: | |
26 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First | |
27 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING | |
28 | * (otherwise the macros compile to empty statements). | |
29 | * | |
30 | */ | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
33 | #include <linux/fs.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/mtio.h> | |
40 | #include <linux/ioctl.h> | |
41 | #include <linux/fcntl.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/poll.h> | |
1da177e4 | 44 | #include <linux/moduleparam.h> |
1da177e4 | 45 | #include <linux/cdev.h> |
7c07d613 | 46 | #include <linux/idr.h> |
1da177e4 LT |
47 | #include <linux/seq_file.h> |
48 | #include <linux/blkdev.h> | |
49 | #include <linux/delay.h> | |
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 */ | |
140 | } Sg_request; | |
141 | ||
142 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
143 | struct sg_fd *nextfp; /* NULL when last opened fd on this device */ | |
144 | struct sg_device *parentdp; /* owning device */ | |
145 | wait_queue_head_t read_wait; /* queue read until command done */ | |
146 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
147 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
148 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
149 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
150 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
151 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
152 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
153 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
154 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
155 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
156 | volatile char closed; /* 1 -> fd closed but request(s) outstanding */ | |
157 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
158 | char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ | |
159 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
160 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
161 | } Sg_fd; | |
162 | ||
163 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
164 | struct scsi_device *device; | |
165 | wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ | |
166 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
7c07d613 | 167 | u32 index; /* device index number */ |
1da177e4 LT |
168 | Sg_fd *headfp; /* first open fd belonging to this device */ |
169 | volatile char detached; /* 0->attached, 1->detached pending removal */ | |
170 | volatile char exclude; /* opened for exclusive access */ | |
171 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ | |
172 | struct gendisk *disk; | |
173 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
174 | } Sg_device; | |
175 | ||
176 | static int sg_fasync(int fd, struct file *filp, int mode); | |
d6b10348 MC |
177 | /* tasklet or soft irq callback */ |
178 | static void sg_cmd_done(void *data, char *sense, int result, int resid); | |
1da177e4 LT |
179 | static int sg_start_req(Sg_request * srp); |
180 | static void sg_finish_rem_req(Sg_request * srp); | |
181 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); | |
182 | static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, | |
183 | int tablesize); | |
184 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, | |
185 | Sg_request * srp); | |
0b07de85 AG |
186 | static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, |
187 | const char __user *buf, size_t count, int blocking, | |
188 | int read_only, Sg_request **o_srp); | |
1da177e4 LT |
189 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, |
190 | unsigned char *cmnd, int timeout, int blocking); | |
191 | static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
192 | int wr_xf, int *countp, unsigned char __user **up); | |
193 | static int sg_write_xfer(Sg_request * srp); | |
194 | static int sg_read_xfer(Sg_request * srp); | |
195 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); | |
196 | static void sg_remove_scat(Sg_scatter_hold * schp); | |
197 | static void sg_build_reserve(Sg_fd * sfp, int req_size); | |
198 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
199 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
d6b10348 MC |
200 | static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); |
201 | static void sg_page_free(struct page *page, int size); | |
1da177e4 LT |
202 | static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); |
203 | static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
204 | static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
205 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); | |
206 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
207 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
208 | static int sg_res_in_use(Sg_fd * sfp); | |
1da177e4 LT |
209 | static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); |
210 | static Sg_device *sg_get_dev(int dev); | |
1da177e4 LT |
211 | #ifdef CONFIG_SCSI_PROC_FS |
212 | static int sg_last_dev(void); | |
213 | #endif | |
214 | ||
1da177e4 LT |
215 | #define SZ_SG_HEADER sizeof(struct sg_header) |
216 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
217 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
218 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
219 | ||
220 | static int | |
221 | sg_open(struct inode *inode, struct file *filp) | |
222 | { | |
223 | int dev = iminor(inode); | |
224 | int flags = filp->f_flags; | |
d6b10348 | 225 | struct request_queue *q; |
1da177e4 LT |
226 | Sg_device *sdp; |
227 | Sg_fd *sfp; | |
228 | int res; | |
229 | int retval; | |
230 | ||
eb09d3d4 | 231 | lock_kernel(); |
1da177e4 LT |
232 | nonseekable_open(inode, filp); |
233 | SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); | |
234 | sdp = sg_get_dev(dev); | |
eb09d3d4 JC |
235 | if ((!sdp) || (!sdp->device)) { |
236 | unlock_kernel(); | |
1da177e4 | 237 | return -ENXIO; |
eb09d3d4 JC |
238 | } |
239 | if (sdp->detached) { | |
240 | unlock_kernel(); | |
1da177e4 | 241 | return -ENODEV; |
eb09d3d4 | 242 | } |
1da177e4 LT |
243 | |
244 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
245 | /* Prevent the device driver from vanishing while we sleep */ | |
246 | retval = scsi_device_get(sdp->device); | |
eb09d3d4 JC |
247 | if (retval) { |
248 | unlock_kernel(); | |
1da177e4 | 249 | return retval; |
eb09d3d4 | 250 | } |
1da177e4 LT |
251 | |
252 | if (!((flags & O_NONBLOCK) || | |
253 | scsi_block_when_processing_errors(sdp->device))) { | |
254 | retval = -ENXIO; | |
255 | /* we are in error recovery for this device */ | |
256 | goto error_out; | |
257 | } | |
258 | ||
259 | if (flags & O_EXCL) { | |
260 | if (O_RDONLY == (flags & O_ACCMODE)) { | |
261 | retval = -EPERM; /* Can't lock it with read only access */ | |
262 | goto error_out; | |
263 | } | |
264 | if (sdp->headfp && (flags & O_NONBLOCK)) { | |
265 | retval = -EBUSY; | |
266 | goto error_out; | |
267 | } | |
268 | res = 0; | |
269 | __wait_event_interruptible(sdp->o_excl_wait, | |
270 | ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); | |
271 | if (res) { | |
272 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
273 | goto error_out; | |
274 | } | |
275 | } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ | |
276 | if (flags & O_NONBLOCK) { | |
277 | retval = -EBUSY; | |
278 | goto error_out; | |
279 | } | |
280 | res = 0; | |
281 | __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), | |
282 | res); | |
283 | if (res) { | |
284 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
285 | goto error_out; | |
286 | } | |
287 | } | |
288 | if (sdp->detached) { | |
289 | retval = -ENODEV; | |
290 | goto error_out; | |
291 | } | |
292 | if (!sdp->headfp) { /* no existing opens on this device */ | |
293 | sdp->sgdebug = 0; | |
d6b10348 MC |
294 | q = sdp->device->request_queue; |
295 | sdp->sg_tablesize = min(q->max_hw_segments, | |
296 | q->max_phys_segments); | |
1da177e4 LT |
297 | } |
298 | if ((sfp = sg_add_sfp(sdp, dev))) | |
299 | filp->private_data = sfp; | |
300 | else { | |
301 | if (flags & O_EXCL) | |
302 | sdp->exclude = 0; /* undo if error */ | |
303 | retval = -ENOMEM; | |
304 | goto error_out; | |
305 | } | |
eb09d3d4 | 306 | unlock_kernel(); |
1da177e4 LT |
307 | return 0; |
308 | ||
309 | error_out: | |
310 | scsi_device_put(sdp->device); | |
eb09d3d4 | 311 | unlock_kernel(); |
1da177e4 LT |
312 | return retval; |
313 | } | |
314 | ||
315 | /* Following function was formerly called 'sg_close' */ | |
316 | static int | |
317 | sg_release(struct inode *inode, struct file *filp) | |
318 | { | |
319 | Sg_device *sdp; | |
320 | Sg_fd *sfp; | |
321 | ||
322 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
323 | return -ENXIO; | |
324 | SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); | |
325 | sg_fasync(-1, filp, 0); /* remove filp from async notification list */ | |
326 | if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ | |
327 | if (!sdp->detached) { | |
328 | scsi_device_put(sdp->device); | |
329 | } | |
330 | sdp->exclude = 0; | |
331 | wake_up_interruptible(&sdp->o_excl_wait); | |
332 | } | |
333 | return 0; | |
334 | } | |
335 | ||
336 | static ssize_t | |
337 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
338 | { | |
1da177e4 LT |
339 | Sg_device *sdp; |
340 | Sg_fd *sfp; | |
341 | Sg_request *srp; | |
342 | int req_pack_id = -1; | |
1da177e4 | 343 | sg_io_hdr_t *hp; |
cb59e840 | 344 | struct sg_header *old_hdr = NULL; |
345 | int retval = 0; | |
1da177e4 LT |
346 | |
347 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
348 | return -ENXIO; | |
349 | SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", | |
350 | sdp->disk->disk_name, (int) count)); | |
d6b10348 | 351 | |
1da177e4 LT |
352 | if (!access_ok(VERIFY_WRITE, buf, count)) |
353 | return -EFAULT; | |
354 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 | 355 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
356 | if (!old_hdr) | |
357 | return -ENOMEM; | |
358 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
359 | retval = -EFAULT; | |
360 | goto free_old_hdr; | |
361 | } | |
362 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 363 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 | 364 | sg_io_hdr_t *new_hdr; |
365 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
366 | if (!new_hdr) { | |
367 | retval = -ENOMEM; | |
368 | goto free_old_hdr; | |
369 | } | |
370 | retval =__copy_from_user | |
371 | (new_hdr, buf, SZ_SG_IO_HDR); | |
372 | req_pack_id = new_hdr->pack_id; | |
373 | kfree(new_hdr); | |
374 | if (retval) { | |
375 | retval = -EFAULT; | |
376 | goto free_old_hdr; | |
377 | } | |
1da177e4 LT |
378 | } |
379 | } else | |
cb59e840 | 380 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
381 | } |
382 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
383 | if (!srp) { /* now wait on packet to arrive */ | |
cb59e840 | 384 | if (sdp->detached) { |
385 | retval = -ENODEV; | |
386 | goto free_old_hdr; | |
387 | } | |
388 | if (filp->f_flags & O_NONBLOCK) { | |
389 | retval = -EAGAIN; | |
390 | goto free_old_hdr; | |
391 | } | |
1da177e4 | 392 | while (1) { |
cb59e840 | 393 | retval = 0; /* following macro beats race condition */ |
1da177e4 | 394 | __wait_event_interruptible(sfp->read_wait, |
cb59e840 | 395 | (sdp->detached || |
396 | (srp = sg_get_rq_mark(sfp, req_pack_id))), | |
397 | retval); | |
398 | if (sdp->detached) { | |
399 | retval = -ENODEV; | |
400 | goto free_old_hdr; | |
401 | } | |
402 | if (0 == retval) | |
1da177e4 | 403 | break; |
cb59e840 | 404 | |
405 | /* -ERESTARTSYS as signal hit process */ | |
406 | goto free_old_hdr; | |
1da177e4 LT |
407 | } |
408 | } | |
cb59e840 | 409 | if (srp->header.interface_id != '\0') { |
410 | retval = sg_new_read(sfp, buf, count, srp); | |
411 | goto free_old_hdr; | |
412 | } | |
1da177e4 LT |
413 | |
414 | hp = &srp->header; | |
cb59e840 | 415 | if (old_hdr == NULL) { |
416 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
417 | if (! old_hdr) { | |
418 | retval = -ENOMEM; | |
419 | goto free_old_hdr; | |
420 | } | |
421 | } | |
422 | memset(old_hdr, 0, SZ_SG_HEADER); | |
423 | old_hdr->reply_len = (int) hp->timeout; | |
424 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
425 | old_hdr->pack_id = hp->pack_id; | |
426 | old_hdr->twelve_byte = | |
1da177e4 | 427 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 | 428 | old_hdr->target_status = hp->masked_status; |
429 | old_hdr->host_status = hp->host_status; | |
430 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
431 | if ((CHECK_CONDITION & hp->masked_status) || |
432 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 | 433 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
434 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
435 | switch (hp->host_status) { |
436 | /* This setup of 'result' is for backward compatibility and is best | |
437 | ignored by the user who should use target, host + driver status */ | |
438 | case DID_OK: | |
439 | case DID_PASSTHROUGH: | |
440 | case DID_SOFT_ERROR: | |
cb59e840 | 441 | old_hdr->result = 0; |
1da177e4 LT |
442 | break; |
443 | case DID_NO_CONNECT: | |
444 | case DID_BUS_BUSY: | |
445 | case DID_TIME_OUT: | |
cb59e840 | 446 | old_hdr->result = EBUSY; |
1da177e4 LT |
447 | break; |
448 | case DID_BAD_TARGET: | |
449 | case DID_ABORT: | |
450 | case DID_PARITY: | |
451 | case DID_RESET: | |
452 | case DID_BAD_INTR: | |
cb59e840 | 453 | old_hdr->result = EIO; |
1da177e4 LT |
454 | break; |
455 | case DID_ERROR: | |
cb59e840 | 456 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
457 | hp->masked_status == GOOD) ? 0 : EIO; |
458 | break; | |
459 | default: | |
cb59e840 | 460 | old_hdr->result = EIO; |
1da177e4 LT |
461 | break; |
462 | } | |
463 | ||
464 | /* Now copy the result back to the user buffer. */ | |
465 | if (count >= SZ_SG_HEADER) { | |
cb59e840 | 466 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
467 | retval = -EFAULT; | |
468 | goto free_old_hdr; | |
469 | } | |
1da177e4 | 470 | buf += SZ_SG_HEADER; |
cb59e840 | 471 | if (count > old_hdr->reply_len) |
472 | count = old_hdr->reply_len; | |
1da177e4 | 473 | if (count > SZ_SG_HEADER) { |
cb59e840 | 474 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
475 | retval = -EFAULT; | |
476 | goto free_old_hdr; | |
477 | } | |
1da177e4 LT |
478 | } |
479 | } else | |
cb59e840 | 480 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 481 | sg_finish_rem_req(srp); |
cb59e840 | 482 | retval = count; |
483 | free_old_hdr: | |
c9475cb0 | 484 | kfree(old_hdr); |
cb59e840 | 485 | return retval; |
1da177e4 LT |
486 | } |
487 | ||
488 | static ssize_t | |
489 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
490 | { | |
491 | sg_io_hdr_t *hp = &srp->header; | |
492 | int err = 0; | |
493 | int len; | |
494 | ||
495 | if (count < SZ_SG_IO_HDR) { | |
496 | err = -EINVAL; | |
497 | goto err_out; | |
498 | } | |
499 | hp->sb_len_wr = 0; | |
500 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
501 | if ((CHECK_CONDITION & hp->masked_status) || | |
502 | (DRIVER_SENSE & hp->driver_status)) { | |
d6b10348 | 503 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
504 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
505 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
506 | len = (len > sb_len) ? sb_len : len; | |
507 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
508 | err = -EFAULT; | |
509 | goto err_out; | |
510 | } | |
511 | hp->sb_len_wr = len; | |
512 | } | |
513 | } | |
514 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
515 | hp->info |= SG_INFO_CHECK; | |
516 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
517 | err = -EFAULT; | |
518 | goto err_out; | |
519 | } | |
520 | err = sg_read_xfer(srp); | |
521 | err_out: | |
522 | sg_finish_rem_req(srp); | |
523 | return (0 == err) ? count : err; | |
524 | } | |
525 | ||
526 | static ssize_t | |
527 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
528 | { | |
529 | int mxsize, cmd_size, k; | |
530 | int input_size, blocking; | |
531 | unsigned char opcode; | |
532 | Sg_device *sdp; | |
533 | Sg_fd *sfp; | |
534 | Sg_request *srp; | |
535 | struct sg_header old_hdr; | |
536 | sg_io_hdr_t *hp; | |
d6b10348 | 537 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
538 | |
539 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
540 | return -ENXIO; | |
541 | SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", | |
542 | sdp->disk->disk_name, (int) count)); | |
543 | if (sdp->detached) | |
544 | return -ENODEV; | |
545 | if (!((filp->f_flags & O_NONBLOCK) || | |
546 | scsi_block_when_processing_errors(sdp->device))) | |
547 | return -ENXIO; | |
548 | ||
549 | if (!access_ok(VERIFY_READ, buf, count)) | |
550 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
551 | if (count < SZ_SG_HEADER) | |
552 | return -EIO; | |
553 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
554 | return -EFAULT; | |
555 | blocking = !(filp->f_flags & O_NONBLOCK); | |
556 | if (old_hdr.reply_len < 0) | |
0b07de85 | 557 | return sg_new_write(sfp, filp, buf, count, blocking, 0, NULL); |
1da177e4 LT |
558 | if (count < (SZ_SG_HEADER + 6)) |
559 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
560 | ||
561 | if (!(srp = sg_add_request(sfp))) { | |
562 | SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); | |
563 | return -EDOM; | |
564 | } | |
565 | buf += SZ_SG_HEADER; | |
566 | __get_user(opcode, buf); | |
567 | if (sfp->next_cmd_len > 0) { | |
568 | if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { | |
569 | SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); | |
570 | sfp->next_cmd_len = 0; | |
571 | sg_remove_request(sfp, srp); | |
572 | return -EIO; | |
573 | } | |
574 | cmd_size = sfp->next_cmd_len; | |
575 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
576 | } else { | |
577 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
578 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
579 | cmd_size = 12; | |
580 | } | |
581 | SCSI_LOG_TIMEOUT(4, printk( | |
582 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
583 | /* Determine buffer size. */ | |
584 | input_size = count - cmd_size; | |
585 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
586 | mxsize -= SZ_SG_HEADER; | |
587 | input_size -= SZ_SG_HEADER; | |
588 | if (input_size < 0) { | |
589 | sg_remove_request(sfp, srp); | |
590 | return -EIO; /* User did not pass enough bytes for this command. */ | |
591 | } | |
592 | hp = &srp->header; | |
593 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
594 | hp->cmd_len = (unsigned char) cmd_size; | |
595 | hp->iovec_count = 0; | |
596 | hp->mx_sb_len = 0; | |
597 | if (input_size > 0) | |
598 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
599 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
600 | else | |
601 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
602 | hp->dxfer_len = mxsize; | |
603 | hp->dxferp = (char __user *)buf + cmd_size; | |
604 | hp->sbp = NULL; | |
605 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
606 | hp->flags = input_size; /* structure abuse ... */ | |
607 | hp->pack_id = old_hdr.pack_id; | |
608 | hp->usr_ptr = NULL; | |
609 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
610 | return -EFAULT; | |
611 | /* | |
612 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
613 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
614 | * is a non-zero input_size, so emit a warning. | |
615 | */ | |
eaa3e22e AK |
616 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
617 | static char cmd[TASK_COMM_LEN]; | |
618 | if (strcmp(current->comm, cmd) && printk_ratelimit()) { | |
1da177e4 LT |
619 | printk(KERN_WARNING |
620 | "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" | |
621 | "guessing data in;\n" KERN_WARNING " " | |
622 | "program %s not setting count and/or reply_len properly\n", | |
623 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
624 | input_size, (unsigned int) cmnd[0], | |
625 | current->comm); | |
eaa3e22e AK |
626 | strcpy(cmd, current->comm); |
627 | } | |
628 | } | |
1da177e4 LT |
629 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
630 | return (k < 0) ? k : count; | |
631 | } | |
632 | ||
633 | static ssize_t | |
0b07de85 AG |
634 | sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, |
635 | size_t count, int blocking, int read_only, | |
636 | Sg_request **o_srp) | |
1da177e4 LT |
637 | { |
638 | int k; | |
639 | Sg_request *srp; | |
640 | sg_io_hdr_t *hp; | |
d6b10348 | 641 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
642 | int timeout; |
643 | unsigned long ul_timeout; | |
644 | ||
645 | if (count < SZ_SG_IO_HDR) | |
646 | return -EINVAL; | |
647 | if (!access_ok(VERIFY_READ, buf, count)) | |
648 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
649 | ||
650 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
651 | if (!(srp = sg_add_request(sfp))) { | |
652 | SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); | |
653 | return -EDOM; | |
654 | } | |
655 | hp = &srp->header; | |
656 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
657 | sg_remove_request(sfp, srp); | |
658 | return -EFAULT; | |
659 | } | |
660 | if (hp->interface_id != 'S') { | |
661 | sg_remove_request(sfp, srp); | |
662 | return -ENOSYS; | |
663 | } | |
664 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
665 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
666 | sg_remove_request(sfp, srp); | |
667 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
668 | } | |
669 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
670 | sg_remove_request(sfp, srp); | |
671 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
672 | } | |
673 | if (sg_res_in_use(sfp)) { | |
674 | sg_remove_request(sfp, srp); | |
675 | return -EBUSY; /* reserve buffer already being used */ | |
676 | } | |
677 | } | |
678 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
679 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
680 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
681 | sg_remove_request(sfp, srp); | |
682 | return -EMSGSIZE; | |
683 | } | |
684 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
685 | sg_remove_request(sfp, srp); | |
686 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
687 | } | |
688 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
689 | sg_remove_request(sfp, srp); | |
690 | return -EFAULT; | |
691 | } | |
2b272d4f | 692 | if (read_only && !blk_verify_command(file, cmnd)) { |
1da177e4 LT |
693 | sg_remove_request(sfp, srp); |
694 | return -EPERM; | |
695 | } | |
696 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
697 | if (k < 0) | |
698 | return k; | |
699 | if (o_srp) | |
700 | *o_srp = srp; | |
701 | return count; | |
702 | } | |
703 | ||
704 | static int | |
705 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
706 | unsigned char *cmnd, int timeout, int blocking) | |
707 | { | |
d6b10348 | 708 | int k, data_dir; |
1da177e4 LT |
709 | Sg_device *sdp = sfp->parentdp; |
710 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
711 | |
712 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
713 | hp->status = 0; | |
714 | hp->masked_status = 0; | |
715 | hp->msg_status = 0; | |
716 | hp->info = 0; | |
717 | hp->host_status = 0; | |
718 | hp->driver_status = 0; | |
719 | hp->resid = 0; | |
720 | SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
721 | (int) cmnd[0], (int) hp->cmd_len)); | |
722 | ||
723 | if ((k = sg_start_req(srp))) { | |
7ca63cb4 | 724 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); |
1da177e4 LT |
725 | sg_finish_rem_req(srp); |
726 | return k; /* probably out of space --> ENOMEM */ | |
727 | } | |
728 | if ((k = sg_write_xfer(srp))) { | |
7ca63cb4 | 729 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n")); |
1da177e4 LT |
730 | sg_finish_rem_req(srp); |
731 | return k; | |
732 | } | |
733 | if (sdp->detached) { | |
734 | sg_finish_rem_req(srp); | |
735 | return -ENODEV; | |
736 | } | |
1da177e4 | 737 | |
1da177e4 LT |
738 | switch (hp->dxfer_direction) { |
739 | case SG_DXFER_TO_FROM_DEV: | |
740 | case SG_DXFER_FROM_DEV: | |
d6b10348 | 741 | data_dir = DMA_FROM_DEVICE; |
1da177e4 LT |
742 | break; |
743 | case SG_DXFER_TO_DEV: | |
d6b10348 | 744 | data_dir = DMA_TO_DEVICE; |
1da177e4 LT |
745 | break; |
746 | case SG_DXFER_UNKNOWN: | |
d6b10348 | 747 | data_dir = DMA_BIDIRECTIONAL; |
1da177e4 LT |
748 | break; |
749 | default: | |
d6b10348 | 750 | data_dir = DMA_NONE; |
1da177e4 LT |
751 | break; |
752 | } | |
cb59e840 | 753 | hp->duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
754 | /* Now send everything of to mid-level. The next time we hear about this |
755 | packet is when sg_cmd_done() is called (i.e. a callback). */ | |
bb1d1073 | 756 | if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, |
d6b10348 MC |
757 | hp->dxfer_len, srp->data.k_use_sg, timeout, |
758 | SG_DEFAULT_RETRIES, srp, sg_cmd_done, | |
759 | GFP_ATOMIC)) { | |
7ca63cb4 | 760 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); |
d6b10348 MC |
761 | /* |
762 | * most likely out of mem, but could also be a bad map | |
763 | */ | |
18c49b8c | 764 | sg_finish_rem_req(srp); |
d6b10348 MC |
765 | return -ENOMEM; |
766 | } else | |
767 | return 0; | |
1da177e4 LT |
768 | } |
769 | ||
770 | static int | |
771 | sg_srp_done(Sg_request *srp, Sg_fd *sfp) | |
772 | { | |
773 | unsigned long iflags; | |
774 | int done; | |
775 | ||
776 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
777 | done = srp->done; | |
778 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
779 | return done; | |
780 | } | |
781 | ||
782 | static int | |
783 | sg_ioctl(struct inode *inode, struct file *filp, | |
784 | unsigned int cmd_in, unsigned long arg) | |
785 | { | |
786 | void __user *p = (void __user *)arg; | |
787 | int __user *ip = p; | |
788 | int result, val, read_only; | |
789 | Sg_device *sdp; | |
790 | Sg_fd *sfp; | |
791 | Sg_request *srp; | |
792 | unsigned long iflags; | |
793 | ||
794 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
795 | return -ENXIO; | |
796 | SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", | |
797 | sdp->disk->disk_name, (int) cmd_in)); | |
798 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
799 | ||
800 | switch (cmd_in) { | |
801 | case SG_IO: | |
802 | { | |
803 | int blocking = 1; /* ignore O_NONBLOCK flag */ | |
804 | ||
805 | if (sdp->detached) | |
806 | return -ENODEV; | |
807 | if (!scsi_block_when_processing_errors(sdp->device)) | |
808 | return -ENXIO; | |
809 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
810 | return -EFAULT; | |
811 | result = | |
0b07de85 | 812 | sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, |
1da177e4 LT |
813 | blocking, read_only, &srp); |
814 | if (result < 0) | |
815 | return result; | |
816 | srp->sg_io_owned = 1; | |
817 | while (1) { | |
818 | result = 0; /* following macro to beat race condition */ | |
819 | __wait_event_interruptible(sfp->read_wait, | |
820 | (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), | |
821 | result); | |
822 | if (sdp->detached) | |
823 | return -ENODEV; | |
824 | if (sfp->closed) | |
825 | return 0; /* request packet dropped already */ | |
826 | if (0 == result) | |
827 | break; | |
828 | srp->orphan = 1; | |
829 | return result; /* -ERESTARTSYS because signal hit process */ | |
830 | } | |
831 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
832 | srp->done = 2; | |
833 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
834 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); | |
835 | return (result < 0) ? result : 0; | |
836 | } | |
837 | case SG_SET_TIMEOUT: | |
838 | result = get_user(val, ip); | |
839 | if (result) | |
840 | return result; | |
841 | if (val < 0) | |
842 | return -EIO; | |
843 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
844 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
845 | sfp->timeout_user = val; | |
846 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
847 | ||
848 | return 0; | |
849 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
850 | /* strange ..., for backward compatibility */ | |
851 | return sfp->timeout_user; | |
852 | case SG_SET_FORCE_LOW_DMA: | |
853 | result = get_user(val, ip); | |
854 | if (result) | |
855 | return result; | |
856 | if (val) { | |
857 | sfp->low_dma = 1; | |
858 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
859 | val = (int) sfp->reserve.bufflen; | |
860 | sg_remove_scat(&sfp->reserve); | |
861 | sg_build_reserve(sfp, val); | |
862 | } | |
863 | } else { | |
864 | if (sdp->detached) | |
865 | return -ENODEV; | |
866 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
867 | } | |
868 | return 0; | |
869 | case SG_GET_LOW_DMA: | |
870 | return put_user((int) sfp->low_dma, ip); | |
871 | case SG_GET_SCSI_ID: | |
872 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
873 | return -EFAULT; | |
874 | else { | |
875 | sg_scsi_id_t __user *sg_idp = p; | |
876 | ||
877 | if (sdp->detached) | |
878 | return -ENODEV; | |
879 | __put_user((int) sdp->device->host->host_no, | |
880 | &sg_idp->host_no); | |
881 | __put_user((int) sdp->device->channel, | |
882 | &sg_idp->channel); | |
883 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
884 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
885 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
886 | __put_user((short) sdp->device->host->cmd_per_lun, | |
887 | &sg_idp->h_cmd_per_lun); | |
888 | __put_user((short) sdp->device->queue_depth, | |
889 | &sg_idp->d_queue_depth); | |
890 | __put_user(0, &sg_idp->unused[0]); | |
891 | __put_user(0, &sg_idp->unused[1]); | |
892 | return 0; | |
893 | } | |
894 | case SG_SET_FORCE_PACK_ID: | |
895 | result = get_user(val, ip); | |
896 | if (result) | |
897 | return result; | |
898 | sfp->force_packid = val ? 1 : 0; | |
899 | return 0; | |
900 | case SG_GET_PACK_ID: | |
901 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
902 | return -EFAULT; | |
903 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
904 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
905 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
906 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
907 | iflags); | |
908 | __put_user(srp->header.pack_id, ip); | |
909 | return 0; | |
910 | } | |
911 | } | |
912 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
913 | __put_user(-1, ip); | |
914 | return 0; | |
915 | case SG_GET_NUM_WAITING: | |
916 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
917 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
918 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
919 | ++val; | |
920 | } | |
921 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
922 | return put_user(val, ip); | |
923 | case SG_GET_SG_TABLESIZE: | |
924 | return put_user(sdp->sg_tablesize, ip); | |
925 | case SG_SET_RESERVED_SIZE: | |
926 | result = get_user(val, ip); | |
927 | if (result) | |
928 | return result; | |
929 | if (val < 0) | |
930 | return -EINVAL; | |
44ec9542 AS |
931 | val = min_t(int, val, |
932 | sdp->device->request_queue->max_sectors * 512); | |
1da177e4 LT |
933 | if (val != sfp->reserve.bufflen) { |
934 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
935 | return -EBUSY; | |
936 | sg_remove_scat(&sfp->reserve); | |
937 | sg_build_reserve(sfp, val); | |
938 | } | |
939 | return 0; | |
940 | case SG_GET_RESERVED_SIZE: | |
44ec9542 AS |
941 | val = min_t(int, sfp->reserve.bufflen, |
942 | sdp->device->request_queue->max_sectors * 512); | |
1da177e4 LT |
943 | return put_user(val, ip); |
944 | case SG_SET_COMMAND_Q: | |
945 | result = get_user(val, ip); | |
946 | if (result) | |
947 | return result; | |
948 | sfp->cmd_q = val ? 1 : 0; | |
949 | return 0; | |
950 | case SG_GET_COMMAND_Q: | |
951 | return put_user((int) sfp->cmd_q, ip); | |
952 | case SG_SET_KEEP_ORPHAN: | |
953 | result = get_user(val, ip); | |
954 | if (result) | |
955 | return result; | |
956 | sfp->keep_orphan = val; | |
957 | return 0; | |
958 | case SG_GET_KEEP_ORPHAN: | |
959 | return put_user((int) sfp->keep_orphan, ip); | |
960 | case SG_NEXT_CMD_LEN: | |
961 | result = get_user(val, ip); | |
962 | if (result) | |
963 | return result; | |
964 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
965 | return 0; | |
966 | case SG_GET_VERSION_NUM: | |
967 | return put_user(sg_version_num, ip); | |
968 | case SG_GET_ACCESS_COUNT: | |
969 | /* faked - we don't have a real access count anymore */ | |
970 | val = (sdp->device ? 1 : 0); | |
971 | return put_user(val, ip); | |
972 | case SG_GET_REQUEST_TABLE: | |
973 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
974 | return -EFAULT; | |
975 | else { | |
cb59e840 | 976 | sg_req_info_t *rinfo; |
977 | unsigned int ms; | |
978 | ||
979 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
980 | GFP_KERNEL); | |
981 | if (!rinfo) | |
982 | return -ENOMEM; | |
1da177e4 LT |
983 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
984 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
985 | ++val, srp = srp ? srp->nextrp : srp) { | |
986 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
987 | if (srp) { | |
988 | rinfo[val].req_state = srp->done + 1; | |
989 | rinfo[val].problem = | |
990 | srp->header.masked_status & | |
991 | srp->header.host_status & | |
992 | srp->header.driver_status; | |
cb59e840 | 993 | if (srp->done) |
994 | rinfo[val].duration = | |
995 | srp->header.duration; | |
996 | else { | |
997 | ms = jiffies_to_msecs(jiffies); | |
998 | rinfo[val].duration = | |
999 | (ms > srp->header.duration) ? | |
1000 | (ms - srp->header.duration) : 0; | |
1001 | } | |
1da177e4 | 1002 | rinfo[val].orphan = srp->orphan; |
cb59e840 | 1003 | rinfo[val].sg_io_owned = |
1004 | srp->sg_io_owned; | |
1005 | rinfo[val].pack_id = | |
1006 | srp->header.pack_id; | |
1007 | rinfo[val].usr_ptr = | |
1008 | srp->header.usr_ptr; | |
1da177e4 LT |
1009 | } |
1010 | } | |
1011 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 | 1012 | result = __copy_to_user(p, rinfo, |
1013 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
1014 | result = result ? -EFAULT : 0; | |
1015 | kfree(rinfo); | |
1016 | return result; | |
1da177e4 LT |
1017 | } |
1018 | case SG_EMULATED_HOST: | |
1019 | if (sdp->detached) | |
1020 | return -ENODEV; | |
1021 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1022 | case SG_SCSI_RESET: | |
1023 | if (sdp->detached) | |
1024 | return -ENODEV; | |
1025 | if (filp->f_flags & O_NONBLOCK) { | |
939647ee | 1026 | if (scsi_host_in_recovery(sdp->device->host)) |
1da177e4 LT |
1027 | return -EBUSY; |
1028 | } else if (!scsi_block_when_processing_errors(sdp->device)) | |
1029 | return -EBUSY; | |
1030 | result = get_user(val, ip); | |
1031 | if (result) | |
1032 | return result; | |
1033 | if (SG_SCSI_RESET_NOTHING == val) | |
1034 | return 0; | |
1035 | switch (val) { | |
1036 | case SG_SCSI_RESET_DEVICE: | |
1037 | val = SCSI_TRY_RESET_DEVICE; | |
1038 | break; | |
39120e11 BK |
1039 | case SG_SCSI_RESET_TARGET: |
1040 | val = SCSI_TRY_RESET_TARGET; | |
1041 | break; | |
1da177e4 LT |
1042 | case SG_SCSI_RESET_BUS: |
1043 | val = SCSI_TRY_RESET_BUS; | |
1044 | break; | |
1045 | case SG_SCSI_RESET_HOST: | |
1046 | val = SCSI_TRY_RESET_HOST; | |
1047 | break; | |
1048 | default: | |
1049 | return -EINVAL; | |
1050 | } | |
1051 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1052 | return -EACCES; | |
1053 | return (scsi_reset_provider(sdp->device, val) == | |
1054 | SUCCESS) ? 0 : -EIO; | |
1055 | case SCSI_IOCTL_SEND_COMMAND: | |
1056 | if (sdp->detached) | |
1057 | return -ENODEV; | |
1058 | if (read_only) { | |
1059 | unsigned char opcode = WRITE_6; | |
1060 | Scsi_Ioctl_Command __user *siocp = p; | |
1061 | ||
1062 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1063 | return -EFAULT; | |
0b07de85 | 1064 | if (!blk_verify_command(filp, &opcode)) |
1da177e4 LT |
1065 | return -EPERM; |
1066 | } | |
21b2f0c8 | 1067 | return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); |
1da177e4 LT |
1068 | case SG_SET_DEBUG: |
1069 | result = get_user(val, ip); | |
1070 | if (result) | |
1071 | return result; | |
1072 | sdp->sgdebug = (char) val; | |
1073 | return 0; | |
1074 | case SCSI_IOCTL_GET_IDLUN: | |
1075 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1076 | case SCSI_IOCTL_PROBE_HOST: | |
1077 | case SG_GET_TRANSFORM: | |
1078 | if (sdp->detached) | |
1079 | return -ENODEV; | |
1080 | return scsi_ioctl(sdp->device, cmd_in, p); | |
44ec9542 AS |
1081 | case BLKSECTGET: |
1082 | return put_user(sdp->device->request_queue->max_sectors * 512, | |
1083 | ip); | |
6da127ad CS |
1084 | case BLKTRACESETUP: |
1085 | return blk_trace_setup(sdp->device->request_queue, | |
1086 | sdp->disk->disk_name, | |
1087 | sdp->device->sdev_gendev.devt, | |
1088 | (char *)arg); | |
1089 | case BLKTRACESTART: | |
1090 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1091 | case BLKTRACESTOP: | |
1092 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1093 | case BLKTRACETEARDOWN: | |
1094 | return blk_trace_remove(sdp->device->request_queue); | |
1da177e4 LT |
1095 | default: |
1096 | if (read_only) | |
1097 | return -EPERM; /* don't know so take safe approach */ | |
1098 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | #ifdef CONFIG_COMPAT | |
1103 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1104 | { | |
1105 | Sg_device *sdp; | |
1106 | Sg_fd *sfp; | |
1107 | struct scsi_device *sdev; | |
1108 | ||
1109 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1110 | return -ENXIO; | |
1111 | ||
1112 | sdev = sdp->device; | |
1113 | if (sdev->host->hostt->compat_ioctl) { | |
1114 | int ret; | |
1115 | ||
1116 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1117 | ||
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | return -ENOIOCTLCMD; | |
1122 | } | |
1123 | #endif | |
1124 | ||
1125 | static unsigned int | |
1126 | sg_poll(struct file *filp, poll_table * wait) | |
1127 | { | |
1128 | unsigned int res = 0; | |
1129 | Sg_device *sdp; | |
1130 | Sg_fd *sfp; | |
1131 | Sg_request *srp; | |
1132 | int count = 0; | |
1133 | unsigned long iflags; | |
1134 | ||
1135 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) | |
1136 | || sfp->closed) | |
1137 | return POLLERR; | |
1138 | poll_wait(filp, &sfp->read_wait, wait); | |
1139 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1140 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1141 | /* if any read waiting, flag it */ | |
1142 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1143 | res = POLLIN | POLLRDNORM; | |
1144 | ++count; | |
1145 | } | |
1146 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1147 | ||
1148 | if (sdp->detached) | |
1149 | res |= POLLHUP; | |
1150 | else if (!sfp->cmd_q) { | |
1151 | if (0 == count) | |
1152 | res |= POLLOUT | POLLWRNORM; | |
1153 | } else if (count < SG_MAX_QUEUE) | |
1154 | res |= POLLOUT | POLLWRNORM; | |
1155 | SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", | |
1156 | sdp->disk->disk_name, (int) res)); | |
1157 | return res; | |
1158 | } | |
1159 | ||
1160 | static int | |
1161 | sg_fasync(int fd, struct file *filp, int mode) | |
1162 | { | |
1163 | int retval; | |
1164 | Sg_device *sdp; | |
1165 | Sg_fd *sfp; | |
1166 | ||
1167 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1168 | return -ENXIO; | |
1169 | SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", | |
1170 | sdp->disk->disk_name, mode)); | |
1171 | ||
1172 | retval = fasync_helper(fd, filp, mode, &sfp->async_qp); | |
1173 | return (retval < 0) ? retval : 0; | |
1174 | } | |
1175 | ||
a13ff0bb NP |
1176 | static int |
1177 | sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1da177e4 LT |
1178 | { |
1179 | Sg_fd *sfp; | |
d6b10348 | 1180 | unsigned long offset, len, sa; |
1da177e4 | 1181 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1182 | struct scatterlist *sg; |
1183 | int k; | |
1da177e4 LT |
1184 | |
1185 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
a13ff0bb | 1186 | return VM_FAULT_SIGBUS; |
1da177e4 | 1187 | rsv_schp = &sfp->reserve; |
a13ff0bb | 1188 | offset = vmf->pgoff << PAGE_SHIFT; |
1da177e4 | 1189 | if (offset >= rsv_schp->bufflen) |
a13ff0bb NP |
1190 | return VM_FAULT_SIGBUS; |
1191 | SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", | |
1da177e4 | 1192 | offset, rsv_schp->k_use_sg)); |
d6b10348 MC |
1193 | sg = rsv_schp->buffer; |
1194 | sa = vma->vm_start; | |
1195 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
b0f655d0 | 1196 | ++k, sg = sg_next(sg)) { |
d6b10348 MC |
1197 | len = vma->vm_end - sa; |
1198 | len = (len < sg->length) ? len : sg->length; | |
1199 | if (offset < len) { | |
a13ff0bb | 1200 | struct page *page; |
45711f1a | 1201 | page = virt_to_page(page_address(sg_page(sg)) + offset); |
d6b10348 | 1202 | get_page(page); /* increment page count */ |
a13ff0bb NP |
1203 | vmf->page = page; |
1204 | return 0; /* success */ | |
1da177e4 | 1205 | } |
d6b10348 MC |
1206 | sa += len; |
1207 | offset -= len; | |
1da177e4 | 1208 | } |
d6b10348 | 1209 | |
a13ff0bb | 1210 | return VM_FAULT_SIGBUS; |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | static struct vm_operations_struct sg_mmap_vm_ops = { | |
a13ff0bb | 1214 | .fault = sg_vma_fault, |
1da177e4 LT |
1215 | }; |
1216 | ||
1217 | static int | |
1218 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1219 | { | |
1220 | Sg_fd *sfp; | |
d6b10348 | 1221 | unsigned long req_sz, len, sa; |
1da177e4 | 1222 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1223 | int k; |
1224 | struct scatterlist *sg; | |
1da177e4 LT |
1225 | |
1226 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1227 | return -ENXIO; | |
cb59e840 | 1228 | req_sz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
1229 | SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", |
1230 | (void *) vma->vm_start, (int) req_sz)); | |
1231 | if (vma->vm_pgoff) | |
1232 | return -EINVAL; /* want no offset */ | |
1233 | rsv_schp = &sfp->reserve; | |
1234 | if (req_sz > rsv_schp->bufflen) | |
1235 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1236 | ||
d6b10348 MC |
1237 | sa = vma->vm_start; |
1238 | sg = rsv_schp->buffer; | |
1239 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
b0f655d0 | 1240 | ++k, sg = sg_next(sg)) { |
d6b10348 MC |
1241 | len = vma->vm_end - sa; |
1242 | len = (len < sg->length) ? len : sg->length; | |
1243 | sa += len; | |
1da177e4 | 1244 | } |
d6b10348 | 1245 | |
f9aed0e2 | 1246 | sfp->mmap_called = 1; |
1c8e71d7 | 1247 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
1248 | vma->vm_private_data = sfp; |
1249 | vma->vm_ops = &sg_mmap_vm_ops; | |
1250 | return 0; | |
1251 | } | |
1252 | ||
1253 | /* This function is a "bottom half" handler that is called by the | |
1254 | * mid level when a command is completed (or has failed). */ | |
1255 | static void | |
d6b10348 | 1256 | sg_cmd_done(void *data, char *sense, int result, int resid) |
1da177e4 | 1257 | { |
d6b10348 | 1258 | Sg_request *srp = data; |
1da177e4 LT |
1259 | Sg_device *sdp = NULL; |
1260 | Sg_fd *sfp; | |
1da177e4 | 1261 | unsigned long iflags; |
cb59e840 | 1262 | unsigned int ms; |
1da177e4 | 1263 | |
1da177e4 LT |
1264 | if (NULL == srp) { |
1265 | printk(KERN_ERR "sg_cmd_done: NULL request\n"); | |
1da177e4 LT |
1266 | return; |
1267 | } | |
1268 | sfp = srp->parentfp; | |
1269 | if (sfp) | |
1270 | sdp = sfp->parentdp; | |
1271 | if ((NULL == sdp) || sdp->detached) { | |
1272 | printk(KERN_INFO "sg_cmd_done: device detached\n"); | |
1da177e4 LT |
1273 | return; |
1274 | } | |
1275 | ||
1da177e4 LT |
1276 | |
1277 | SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", | |
d6b10348 MC |
1278 | sdp->disk->disk_name, srp->header.pack_id, result)); |
1279 | srp->header.resid = resid; | |
cb59e840 | 1280 | ms = jiffies_to_msecs(jiffies); |
1281 | srp->header.duration = (ms > srp->header.duration) ? | |
1282 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1283 | if (0 != result) { |
1da177e4 LT |
1284 | struct scsi_sense_hdr sshdr; |
1285 | ||
d6b10348 MC |
1286 | memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); |
1287 | srp->header.status = 0xff & result; | |
1288 | srp->header.masked_status = status_byte(result); | |
1289 | srp->header.msg_status = msg_byte(result); | |
1290 | srp->header.host_status = host_byte(result); | |
1291 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1292 | if ((sdp->sgdebug > 0) && |
1293 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1294 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d6b10348 MC |
1295 | __scsi_print_sense("sg_cmd_done", sense, |
1296 | SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
1297 | |
1298 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1299 | if (driver_byte(result) != 0 |
1300 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1301 | && !scsi_sense_is_deferred(&sshdr) |
1302 | && sshdr.sense_key == UNIT_ATTENTION | |
1303 | && sdp->device->removable) { | |
1304 | /* Detected possible disc change. Set the bit - this */ | |
1305 | /* may be used if there are filesystems using this device */ | |
1306 | sdp->device->changed = 1; | |
1307 | } | |
1308 | } | |
1309 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1310 | ||
1da177e4 LT |
1311 | if (sfp->closed) { /* whoops this fd already released, cleanup */ |
1312 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); | |
1313 | sg_finish_rem_req(srp); | |
1314 | srp = NULL; | |
1315 | if (NULL == sfp->headrp) { | |
7ca63cb4 | 1316 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); |
1da177e4 LT |
1317 | if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ |
1318 | scsi_device_put(sdp->device); | |
1319 | } | |
1320 | sfp = NULL; | |
1321 | } | |
1322 | } else if (srp && srp->orphan) { | |
1323 | if (sfp->keep_orphan) | |
1324 | srp->sg_io_owned = 0; | |
1325 | else { | |
1326 | sg_finish_rem_req(srp); | |
1327 | srp = NULL; | |
1328 | } | |
1329 | } | |
1330 | if (sfp && srp) { | |
1331 | /* Now wake up any sg_read() that is waiting for this packet. */ | |
1332 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); | |
1333 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1334 | srp->done = 1; | |
1335 | wake_up_interruptible(&sfp->read_wait); | |
1336 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1337 | } | |
1338 | } | |
1339 | ||
1340 | static struct file_operations sg_fops = { | |
1341 | .owner = THIS_MODULE, | |
1342 | .read = sg_read, | |
1343 | .write = sg_write, | |
1344 | .poll = sg_poll, | |
1345 | .ioctl = sg_ioctl, | |
1346 | #ifdef CONFIG_COMPAT | |
1347 | .compat_ioctl = sg_compat_ioctl, | |
1348 | #endif | |
1349 | .open = sg_open, | |
1350 | .mmap = sg_mmap, | |
1351 | .release = sg_release, | |
1352 | .fasync = sg_fasync, | |
1353 | }; | |
1354 | ||
d253878b | 1355 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1356 | |
1357 | static int sg_sysfs_valid = 0; | |
1358 | ||
7c07d613 | 1359 | static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) |
1da177e4 | 1360 | { |
d6b10348 | 1361 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1362 | Sg_device *sdp; |
1363 | unsigned long iflags; | |
7c07d613 JB |
1364 | int error; |
1365 | u32 k; | |
1da177e4 | 1366 | |
24669f75 | 1367 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
1da177e4 LT |
1368 | if (!sdp) { |
1369 | printk(KERN_WARNING "kmalloc Sg_device failure\n"); | |
7c07d613 JB |
1370 | return ERR_PTR(-ENOMEM); |
1371 | } | |
1372 | error = -ENOMEM; | |
1373 | if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { | |
1374 | printk(KERN_WARNING "idr expansion Sg_device failure\n"); | |
1375 | goto out; | |
1da177e4 LT |
1376 | } |
1377 | ||
7c07d613 JB |
1378 | write_lock_irqsave(&sg_index_lock, iflags); |
1379 | error = idr_get_new(&sg_index_idr, sdp, &k); | |
1380 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 | 1381 | |
7c07d613 JB |
1382 | if (error) { |
1383 | printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", | |
1384 | error); | |
1385 | goto out; | |
1da177e4 LT |
1386 | } |
1387 | ||
1da177e4 LT |
1388 | if (unlikely(k >= SG_MAX_DEVS)) |
1389 | goto overflow; | |
1390 | ||
1da177e4 LT |
1391 | SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); |
1392 | sprintf(disk->disk_name, "sg%d", k); | |
1393 | disk->first_minor = k; | |
1394 | sdp->disk = disk; | |
1395 | sdp->device = scsidp; | |
1396 | init_waitqueue_head(&sdp->o_excl_wait); | |
d6b10348 | 1397 | sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); |
7c07d613 | 1398 | sdp->index = k; |
1da177e4 | 1399 | |
7c07d613 | 1400 | error = 0; |
1da177e4 | 1401 | out: |
7c07d613 | 1402 | if (error) { |
1da177e4 | 1403 | kfree(sdp); |
7c07d613 JB |
1404 | return ERR_PTR(error); |
1405 | } | |
1406 | return sdp; | |
1da177e4 LT |
1407 | |
1408 | overflow: | |
9ccfc756 JB |
1409 | sdev_printk(KERN_WARNING, scsidp, |
1410 | "Unable to attach sg device type=%d, minor " | |
1411 | "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); | |
1da177e4 LT |
1412 | error = -ENODEV; |
1413 | goto out; | |
1414 | } | |
1415 | ||
1416 | static int | |
ee959b00 | 1417 | sg_add(struct device *cl_dev, struct class_interface *cl_intf) |
1da177e4 | 1418 | { |
ee959b00 | 1419 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1da177e4 LT |
1420 | struct gendisk *disk; |
1421 | Sg_device *sdp = NULL; | |
1422 | struct cdev * cdev = NULL; | |
7c07d613 | 1423 | int error; |
454e8957 | 1424 | unsigned long iflags; |
1da177e4 LT |
1425 | |
1426 | disk = alloc_disk(1); | |
1427 | if (!disk) { | |
1428 | printk(KERN_WARNING "alloc_disk failed\n"); | |
1429 | return -ENOMEM; | |
1430 | } | |
1431 | disk->major = SCSI_GENERIC_MAJOR; | |
1432 | ||
1433 | error = -ENOMEM; | |
1434 | cdev = cdev_alloc(); | |
1435 | if (!cdev) { | |
1436 | printk(KERN_WARNING "cdev_alloc failed\n"); | |
1437 | goto out; | |
1438 | } | |
1439 | cdev->owner = THIS_MODULE; | |
1440 | cdev->ops = &sg_fops; | |
1441 | ||
7c07d613 JB |
1442 | sdp = sg_alloc(disk, scsidp); |
1443 | if (IS_ERR(sdp)) { | |
1da177e4 | 1444 | printk(KERN_WARNING "sg_alloc failed\n"); |
7c07d613 | 1445 | error = PTR_ERR(sdp); |
1da177e4 LT |
1446 | goto out; |
1447 | } | |
1da177e4 | 1448 | |
7c07d613 | 1449 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
5e3c34c1 | 1450 | if (error) |
454e8957 | 1451 | goto cdev_add_err; |
5e3c34c1 | 1452 | |
1da177e4 LT |
1453 | sdp->cdev = cdev; |
1454 | if (sg_sysfs_valid) { | |
ee959b00 | 1455 | struct device *sg_class_member; |
1da177e4 | 1456 | |
24b42566 GKH |
1457 | sg_class_member = device_create_drvdata(sg_sysfs_class, |
1458 | cl_dev->parent, | |
1459 | MKDEV(SCSI_GENERIC_MAJOR, | |
1460 | sdp->index), | |
1461 | sdp, | |
1462 | "%s", disk->disk_name); | |
d07e0361 FT |
1463 | if (IS_ERR(sg_class_member)) { |
1464 | printk(KERN_ERR "sg_add: " | |
ee959b00 | 1465 | "device_create failed\n"); |
d07e0361 FT |
1466 | error = PTR_ERR(sg_class_member); |
1467 | goto cdev_add_err; | |
1468 | } | |
d07e0361 | 1469 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
1da177e4 LT |
1470 | &sg_class_member->kobj, "generic"); |
1471 | if (error) | |
1472 | printk(KERN_ERR "sg_add: unable to make symlink " | |
7c07d613 | 1473 | "'generic' back to sg%d\n", sdp->index); |
1da177e4 | 1474 | } else |
7c07d613 | 1475 | printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); |
1da177e4 | 1476 | |
9ccfc756 | 1477 | sdev_printk(KERN_NOTICE, scsidp, |
7c07d613 JB |
1478 | "Attached scsi generic sg%d type %d\n", sdp->index, |
1479 | scsidp->type); | |
1da177e4 | 1480 | |
ee959b00 | 1481 | dev_set_drvdata(cl_dev, sdp); |
a24484f2 | 1482 | |
1da177e4 LT |
1483 | return 0; |
1484 | ||
454e8957 | 1485 | cdev_add_err: |
7c07d613 JB |
1486 | write_lock_irqsave(&sg_index_lock, iflags); |
1487 | idr_remove(&sg_index_idr, sdp->index); | |
1488 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1489 | kfree(sdp); | |
454e8957 | 1490 | |
1da177e4 LT |
1491 | out: |
1492 | put_disk(disk); | |
1493 | if (cdev) | |
1494 | cdev_del(cdev); | |
1495 | return error; | |
1496 | } | |
1497 | ||
1498 | static void | |
ee959b00 | 1499 | sg_remove(struct device *cl_dev, struct class_interface *cl_intf) |
1da177e4 | 1500 | { |
ee959b00 TJ |
1501 | struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); |
1502 | Sg_device *sdp = dev_get_drvdata(cl_dev); | |
1da177e4 LT |
1503 | unsigned long iflags; |
1504 | Sg_fd *sfp; | |
1505 | Sg_fd *tsfp; | |
1506 | Sg_request *srp; | |
1507 | Sg_request *tsrp; | |
7c07d613 | 1508 | int delay; |
1da177e4 | 1509 | |
7c07d613 | 1510 | if (!sdp) |
1da177e4 | 1511 | return; |
7c07d613 | 1512 | |
1da177e4 | 1513 | delay = 0; |
7c07d613 JB |
1514 | write_lock_irqsave(&sg_index_lock, iflags); |
1515 | if (sdp->headfp) { | |
1516 | sdp->detached = 1; | |
1517 | for (sfp = sdp->headfp; sfp; sfp = tsfp) { | |
1518 | tsfp = sfp->nextfp; | |
1519 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
1520 | tsrp = srp->nextrp; | |
1521 | if (sfp->closed || (0 == sg_srp_done(srp, sfp))) | |
1522 | sg_finish_rem_req(srp); | |
1da177e4 | 1523 | } |
7c07d613 JB |
1524 | if (sfp->closed) { |
1525 | scsi_device_put(sdp->device); | |
1526 | __sg_remove_sfp(sdp, sfp); | |
1527 | } else { | |
1528 | delay = 1; | |
1529 | wake_up_interruptible(&sfp->read_wait); | |
1530 | kill_fasync(&sfp->async_qp, SIGPOLL, | |
1531 | POLL_HUP); | |
1da177e4 | 1532 | } |
1da177e4 | 1533 | } |
7c07d613 JB |
1534 | SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index)); |
1535 | if (NULL == sdp->headfp) { | |
1536 | idr_remove(&sg_index_idr, sdp->index); | |
1537 | } | |
1538 | } else { /* nothing active, simple case */ | |
1539 | SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); | |
1540 | idr_remove(&sg_index_idr, sdp->index); | |
1541 | } | |
1542 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1543 | ||
1544 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
ee959b00 | 1545 | device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); |
7c07d613 JB |
1546 | cdev_del(sdp->cdev); |
1547 | sdp->cdev = NULL; | |
1548 | put_disk(sdp->disk); | |
1549 | sdp->disk = NULL; | |
1550 | if (NULL == sdp->headfp) | |
1551 | kfree(sdp); | |
1da177e4 LT |
1552 | |
1553 | if (delay) | |
1554 | msleep(10); /* dirty detach so delay device destruction */ | |
1555 | } | |
1556 | ||
6460e75a DG |
1557 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
1558 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1559 | S_IRUGO | S_IWUSR); | |
1da177e4 LT |
1560 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
1561 | ||
1562 | MODULE_AUTHOR("Douglas Gilbert"); | |
1563 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1564 | MODULE_LICENSE("GPL"); | |
1565 | MODULE_VERSION(SG_VERSION_STR); | |
f018fa55 | 1566 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
1da177e4 | 1567 | |
6460e75a DG |
1568 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
1569 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1da177e4 LT |
1570 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
1571 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1572 | ||
1573 | static int __init | |
1574 | init_sg(void) | |
1575 | { | |
1576 | int rc; | |
1577 | ||
6460e75a DG |
1578 | if (scatter_elem_sz < PAGE_SIZE) { |
1579 | scatter_elem_sz = PAGE_SIZE; | |
1580 | scatter_elem_sz_prev = scatter_elem_sz; | |
1581 | } | |
1da177e4 LT |
1582 | if (def_reserved_size >= 0) |
1583 | sg_big_buff = def_reserved_size; | |
6460e75a DG |
1584 | else |
1585 | def_reserved_size = sg_big_buff; | |
1da177e4 LT |
1586 | |
1587 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1588 | SG_MAX_DEVS, "sg"); | |
1589 | if (rc) | |
1590 | return rc; | |
d253878b | 1591 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1592 | if ( IS_ERR(sg_sysfs_class) ) { |
1593 | rc = PTR_ERR(sg_sysfs_class); | |
1594 | goto err_out; | |
1595 | } | |
1596 | sg_sysfs_valid = 1; | |
1597 | rc = scsi_register_interface(&sg_interface); | |
1598 | if (0 == rc) { | |
1599 | #ifdef CONFIG_SCSI_PROC_FS | |
1600 | sg_proc_init(); | |
1601 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1602 | return 0; | |
1603 | } | |
d253878b | 1604 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1605 | err_out: |
1606 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1607 | return rc; | |
1608 | } | |
1609 | ||
1610 | static void __exit | |
1611 | exit_sg(void) | |
1612 | { | |
1613 | #ifdef CONFIG_SCSI_PROC_FS | |
1614 | sg_proc_cleanup(); | |
1615 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1616 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1617 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1618 | sg_sysfs_valid = 0; |
1619 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1620 | SG_MAX_DEVS); | |
7c07d613 | 1621 | idr_destroy(&sg_index_idr); |
1da177e4 LT |
1622 | } |
1623 | ||
1624 | static int | |
1625 | sg_start_req(Sg_request * srp) | |
1626 | { | |
1627 | int res; | |
1628 | Sg_fd *sfp = srp->parentfp; | |
1629 | sg_io_hdr_t *hp = &srp->header; | |
1630 | int dxfer_len = (int) hp->dxfer_len; | |
1631 | int dxfer_dir = hp->dxfer_direction; | |
1632 | Sg_scatter_hold *req_schp = &srp->data; | |
1633 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1634 | ||
1635 | SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); | |
1636 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) | |
1637 | return 0; | |
1638 | if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && | |
1639 | (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && | |
1640 | (!sfp->parentdp->device->host->unchecked_isa_dma)) { | |
1641 | res = sg_build_direct(srp, sfp, dxfer_len); | |
1642 | if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ | |
1643 | return res; | |
1644 | } | |
1645 | if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) | |
1646 | sg_link_reserve(sfp, srp, dxfer_len); | |
1647 | else { | |
1648 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1649 | if (res) { | |
1650 | sg_remove_scat(req_schp); | |
1651 | return res; | |
1652 | } | |
1653 | } | |
1654 | return 0; | |
1655 | } | |
1656 | ||
1657 | static void | |
1658 | sg_finish_rem_req(Sg_request * srp) | |
1659 | { | |
1660 | Sg_fd *sfp = srp->parentfp; | |
1661 | Sg_scatter_hold *req_schp = &srp->data; | |
1662 | ||
1663 | SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); | |
1664 | if (srp->res_used) | |
1665 | sg_unlink_reserve(sfp, srp); | |
1666 | else | |
1667 | sg_remove_scat(req_schp); | |
1668 | sg_remove_request(sfp, srp); | |
1669 | } | |
1670 | ||
1671 | static int | |
1672 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1673 | { | |
d6b10348 | 1674 | int sg_bufflen = tablesize * sizeof(struct scatterlist); |
2d20eaf9 | 1675 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 1676 | |
d6b10348 MC |
1677 | /* |
1678 | * TODO: test without low_dma, we should not need it since | |
1679 | * the block layer will bounce the buffer for us | |
1680 | * | |
1681 | * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. | |
1682 | */ | |
1683 | if (sfp->low_dma) | |
1684 | gfp_flags |= GFP_DMA; | |
1685 | schp->buffer = kzalloc(sg_bufflen, gfp_flags); | |
1da177e4 LT |
1686 | if (!schp->buffer) |
1687 | return -ENOMEM; | |
30fa0d0f | 1688 | sg_init_table(schp->buffer, tablesize); |
1da177e4 | 1689 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1690 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1691 | } |
1692 | ||
1693 | #ifdef SG_ALLOW_DIO_CODE | |
1694 | /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ | |
d6b10348 | 1695 | /* TODO: hopefully we can use the generic block layer code */ |
1da177e4 LT |
1696 | |
1697 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
1698 | - mapping of all pages not successful | |
1da177e4 LT |
1699 | (i.e., either completely successful or fails) |
1700 | */ | |
1701 | static int | |
1702 | st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
d6b10348 | 1703 | unsigned long uaddr, size_t count, int rw) |
1da177e4 | 1704 | { |
deb92b7e DG |
1705 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1706 | unsigned long start = uaddr >> PAGE_SHIFT; | |
1707 | const int nr_pages = end - start; | |
1da177e4 | 1708 | int res, i, j; |
1da177e4 LT |
1709 | struct page **pages; |
1710 | ||
1da177e4 LT |
1711 | /* User attempted Overflow! */ |
1712 | if ((uaddr + count) < uaddr) | |
1713 | return -EINVAL; | |
1714 | ||
1715 | /* Too big */ | |
1716 | if (nr_pages > max_pages) | |
1717 | return -ENOMEM; | |
1718 | ||
1719 | /* Hmm? */ | |
1720 | if (count == 0) | |
1721 | return 0; | |
1722 | ||
1723 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) | |
1724 | return -ENOMEM; | |
1725 | ||
1726 | /* Try to fault in all of the necessary pages */ | |
1727 | down_read(¤t->mm->mmap_sem); | |
1728 | /* rw==READ means read from drive, write into memory area */ | |
1729 | res = get_user_pages( | |
1730 | current, | |
1731 | current->mm, | |
1732 | uaddr, | |
1733 | nr_pages, | |
1734 | rw == READ, | |
1735 | 0, /* don't force */ | |
1736 | pages, | |
1737 | NULL); | |
1738 | up_read(¤t->mm->mmap_sem); | |
1739 | ||
1740 | /* Errors and no page mapped should return here */ | |
1741 | if (res < nr_pages) | |
1742 | goto out_unmap; | |
1743 | ||
1744 | for (i=0; i < nr_pages; i++) { | |
1745 | /* FIXME: flush superflous for rw==READ, | |
1746 | * probably wrong function for rw==WRITE | |
1747 | */ | |
1748 | flush_dcache_page(pages[i]); | |
1da177e4 LT |
1749 | /* ?? Is locking needed? I don't think so */ |
1750 | /* if (TestSetPageLocked(pages[i])) | |
1751 | goto out_unlock; */ | |
1752 | } | |
1753 | ||
642f1490 | 1754 | sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK); |
1da177e4 LT |
1755 | if (nr_pages > 1) { |
1756 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
1757 | count -= sgl[0].length; | |
642f1490 JA |
1758 | for (i=1; i < nr_pages ; i++) |
1759 | sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0); | |
1da177e4 LT |
1760 | } |
1761 | else { | |
1762 | sgl[0].length = count; | |
1763 | } | |
1764 | ||
1765 | kfree(pages); | |
1766 | return nr_pages; | |
1767 | ||
1da177e4 | 1768 | out_unmap: |
4d5cda06 | 1769 | if (res > 0) { |
1da177e4 LT |
1770 | for (j=0; j < res; j++) |
1771 | page_cache_release(pages[j]); | |
4d5cda06 HD |
1772 | res = 0; |
1773 | } | |
1da177e4 LT |
1774 | kfree(pages); |
1775 | return res; | |
1776 | } | |
1777 | ||
1778 | ||
1779 | /* And unmap them... */ | |
1780 | static int | |
1781 | st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
1782 | int dirtied) | |
1783 | { | |
1784 | int i; | |
1785 | ||
1786 | for (i=0; i < nr_pages; i++) { | |
45711f1a | 1787 | struct page *page = sg_page(&sgl[i]); |
b5810039 | 1788 | |
b5810039 NP |
1789 | if (dirtied) |
1790 | SetPageDirty(page); | |
1791 | /* unlock_page(page); */ | |
1da177e4 LT |
1792 | /* FIXME: cache flush missing for rw==READ |
1793 | * FIXME: call the correct reference counting function | |
1794 | */ | |
b5810039 | 1795 | page_cache_release(page); |
1da177e4 LT |
1796 | } |
1797 | ||
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ | |
1802 | #endif | |
1803 | ||
1804 | ||
1805 | /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ | |
1806 | static int | |
1807 | sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) | |
1808 | { | |
1809 | #ifdef SG_ALLOW_DIO_CODE | |
1810 | sg_io_hdr_t *hp = &srp->header; | |
1811 | Sg_scatter_hold *schp = &srp->data; | |
1812 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 LT |
1813 | int mx_sc_elems, res; |
1814 | struct scsi_device *sdev = sfp->parentdp->device; | |
1815 | ||
1816 | if (((unsigned long)hp->dxferp & | |
1817 | queue_dma_alignment(sdev->request_queue)) != 0) | |
1818 | return 1; | |
d6b10348 | 1819 | |
1da177e4 LT |
1820 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); |
1821 | if (mx_sc_elems <= 0) { | |
1822 | return 1; | |
1823 | } | |
d6b10348 MC |
1824 | res = st_map_user_pages(schp->buffer, mx_sc_elems, |
1825 | (unsigned long)hp->dxferp, dxfer_len, | |
1826 | (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); | |
c06bb7f5 DG |
1827 | if (res <= 0) { |
1828 | sg_remove_scat(schp); | |
1da177e4 | 1829 | return 1; |
c06bb7f5 | 1830 | } |
1da177e4 LT |
1831 | schp->k_use_sg = res; |
1832 | schp->dio_in_use = 1; | |
1833 | hp->info |= SG_INFO_DIRECT_IO; | |
1834 | return 0; | |
1835 | #else | |
1836 | return 1; | |
1837 | #endif | |
1838 | } | |
1839 | ||
1840 | static int | |
1841 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1842 | { | |
d6b10348 MC |
1843 | struct scatterlist *sg; |
1844 | int ret_sz = 0, k, rem_sz, num, mx_sc_elems; | |
1845 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 | 1846 | int blk_size = buff_size; |
d6b10348 | 1847 | struct page *p = NULL; |
1da177e4 | 1848 | |
fb119935 | 1849 | if (blk_size < 0) |
1da177e4 LT |
1850 | return -EFAULT; |
1851 | if (0 == blk_size) | |
1852 | ++blk_size; /* don't know why */ | |
1853 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ | |
1854 | blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); | |
1855 | SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1856 | buff_size, blk_size)); | |
d6b10348 MC |
1857 | |
1858 | /* N.B. ret_sz carried into this block ... */ | |
1859 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1860 | if (mx_sc_elems < 0) | |
1861 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1862 | ||
6460e75a DG |
1863 | num = scatter_elem_sz; |
1864 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1865 | if (num < PAGE_SIZE) { | |
1866 | scatter_elem_sz = PAGE_SIZE; | |
1867 | scatter_elem_sz_prev = PAGE_SIZE; | |
1868 | } else | |
1869 | scatter_elem_sz_prev = num; | |
1870 | } | |
d6b10348 MC |
1871 | for (k = 0, sg = schp->buffer, rem_sz = blk_size; |
1872 | (rem_sz > 0) && (k < mx_sc_elems); | |
b0f655d0 | 1873 | ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { |
d6b10348 | 1874 | |
6460e75a DG |
1875 | num = (rem_sz > scatter_elem_sz_prev) ? |
1876 | scatter_elem_sz_prev : rem_sz; | |
d6b10348 | 1877 | p = sg_page_malloc(num, sfp->low_dma, &ret_sz); |
1da177e4 LT |
1878 | if (!p) |
1879 | return -ENOMEM; | |
d6b10348 | 1880 | |
6460e75a DG |
1881 | if (num == scatter_elem_sz_prev) { |
1882 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1883 | scatter_elem_sz = ret_sz; | |
1884 | scatter_elem_sz_prev = ret_sz; | |
1885 | } | |
1886 | } | |
642f1490 | 1887 | sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0); |
d6b10348 | 1888 | |
7ca63cb4 DG |
1889 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " |
1890 | "ret_sz=%d\n", k, num, ret_sz)); | |
d6b10348 MC |
1891 | } /* end of for loop */ |
1892 | ||
1893 | schp->k_use_sg = k; | |
7ca63cb4 DG |
1894 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " |
1895 | "rem_sz=%d\n", k, rem_sz)); | |
d6b10348 MC |
1896 | |
1897 | schp->bufflen = blk_size; | |
1898 | if (rem_sz > 0) /* must have failed */ | |
1899 | return -ENOMEM; | |
1900 | ||
1da177e4 LT |
1901 | return 0; |
1902 | } | |
1903 | ||
1904 | static int | |
1905 | sg_write_xfer(Sg_request * srp) | |
1906 | { | |
1907 | sg_io_hdr_t *hp = &srp->header; | |
1908 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 1909 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
1910 | int num_xfer = 0; |
1911 | int j, k, onum, usglen, ksglen, res; | |
1912 | int iovec_count = (int) hp->iovec_count; | |
1913 | int dxfer_dir = hp->dxfer_direction; | |
1914 | unsigned char *p; | |
1915 | unsigned char __user *up; | |
1916 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
1917 | ||
1918 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || | |
1919 | (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
1920 | num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); | |
1921 | if (schp->bufflen < num_xfer) | |
1922 | num_xfer = schp->bufflen; | |
1923 | } | |
1924 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
1925 | (new_interface | |
1926 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
1927 | return 0; | |
1928 | ||
1929 | SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
1930 | num_xfer, iovec_count, schp->k_use_sg)); | |
1931 | if (iovec_count) { | |
1932 | onum = iovec_count; | |
1933 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
1934 | return -EFAULT; | |
1935 | } else | |
1936 | onum = 1; | |
1937 | ||
d6b10348 | 1938 | ksglen = sg->length; |
45711f1a | 1939 | p = page_address(sg_page(sg)); |
d6b10348 MC |
1940 | for (j = 0, k = 0; j < onum; ++j) { |
1941 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
1942 | if (res) | |
1943 | return res; | |
1944 | ||
b0f655d0 | 1945 | for (; p; sg = sg_next(sg), ksglen = sg->length, |
45711f1a | 1946 | p = page_address(sg_page(sg))) { |
d6b10348 MC |
1947 | if (usglen <= 0) |
1948 | break; | |
1949 | if (ksglen > usglen) { | |
1950 | if (usglen >= num_xfer) { | |
1951 | if (__copy_from_user(p, up, num_xfer)) | |
1da177e4 | 1952 | return -EFAULT; |
d6b10348 | 1953 | return 0; |
1da177e4 | 1954 | } |
d6b10348 MC |
1955 | if (__copy_from_user(p, up, usglen)) |
1956 | return -EFAULT; | |
1957 | p += usglen; | |
1958 | ksglen -= usglen; | |
1959 | break; | |
1960 | } else { | |
1961 | if (ksglen >= num_xfer) { | |
1962 | if (__copy_from_user(p, up, num_xfer)) | |
1963 | return -EFAULT; | |
1da177e4 | 1964 | return 0; |
d6b10348 MC |
1965 | } |
1966 | if (__copy_from_user(p, up, ksglen)) | |
1967 | return -EFAULT; | |
1968 | up += ksglen; | |
1969 | usglen -= ksglen; | |
1da177e4 | 1970 | } |
d6b10348 MC |
1971 | ++k; |
1972 | if (k >= schp->k_use_sg) | |
1973 | return 0; | |
1da177e4 LT |
1974 | } |
1975 | } | |
d6b10348 | 1976 | |
1da177e4 LT |
1977 | return 0; |
1978 | } | |
1979 | ||
1980 | static int | |
1981 | sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
1982 | int wr_xf, int *countp, unsigned char __user **up) | |
1983 | { | |
1984 | int num_xfer = (int) hp->dxfer_len; | |
1985 | unsigned char __user *p = hp->dxferp; | |
1986 | int count; | |
1987 | ||
1988 | if (0 == sg_num) { | |
1989 | if (wr_xf && ('\0' == hp->interface_id)) | |
1990 | count = (int) hp->flags; /* holds "old" input_size */ | |
1991 | else | |
1992 | count = num_xfer; | |
1993 | } else { | |
1994 | sg_iovec_t iovec; | |
1995 | if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) | |
1996 | return -EFAULT; | |
1997 | p = iovec.iov_base; | |
1998 | count = (int) iovec.iov_len; | |
1999 | } | |
2000 | if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) | |
2001 | return -EFAULT; | |
2002 | if (up) | |
2003 | *up = p; | |
2004 | if (countp) | |
2005 | *countp = count; | |
2006 | return 0; | |
2007 | } | |
2008 | ||
2009 | static void | |
2010 | sg_remove_scat(Sg_scatter_hold * schp) | |
2011 | { | |
2012 | SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
2013 | if (schp->buffer && (schp->sglist_len > 0)) { | |
d6b10348 | 2014 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2015 | |
2016 | if (schp->dio_in_use) { | |
2017 | #ifdef SG_ALLOW_DIO_CODE | |
d6b10348 | 2018 | st_unmap_user_pages(sg, schp->k_use_sg, TRUE); |
1da177e4 LT |
2019 | #endif |
2020 | } else { | |
2021 | int k; | |
2022 | ||
45711f1a | 2023 | for (k = 0; (k < schp->k_use_sg) && sg_page(sg); |
b0f655d0 | 2024 | ++k, sg = sg_next(sg)) { |
1da177e4 | 2025 | SCSI_LOG_TIMEOUT(5, printk( |
7ca63cb4 | 2026 | "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", |
45711f1a JA |
2027 | k, sg_page(sg), sg->length)); |
2028 | sg_page_free(sg_page(sg), sg->length); | |
1da177e4 LT |
2029 | } |
2030 | } | |
d6b10348 MC |
2031 | kfree(schp->buffer); |
2032 | } | |
1da177e4 LT |
2033 | memset(schp, 0, sizeof (*schp)); |
2034 | } | |
2035 | ||
2036 | static int | |
2037 | sg_read_xfer(Sg_request * srp) | |
2038 | { | |
2039 | sg_io_hdr_t *hp = &srp->header; | |
2040 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 2041 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2042 | int num_xfer = 0; |
2043 | int j, k, onum, usglen, ksglen, res; | |
2044 | int iovec_count = (int) hp->iovec_count; | |
2045 | int dxfer_dir = hp->dxfer_direction; | |
2046 | unsigned char *p; | |
2047 | unsigned char __user *up; | |
2048 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2049 | ||
2050 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) | |
2051 | || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2052 | num_xfer = hp->dxfer_len; | |
2053 | if (schp->bufflen < num_xfer) | |
2054 | num_xfer = schp->bufflen; | |
2055 | } | |
2056 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2057 | (new_interface | |
2058 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2059 | return 0; | |
2060 | ||
2061 | SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2062 | num_xfer, iovec_count, schp->k_use_sg)); | |
2063 | if (iovec_count) { | |
2064 | onum = iovec_count; | |
2065 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2066 | return -EFAULT; | |
2067 | } else | |
2068 | onum = 1; | |
2069 | ||
45711f1a | 2070 | p = page_address(sg_page(sg)); |
d6b10348 MC |
2071 | ksglen = sg->length; |
2072 | for (j = 0, k = 0; j < onum; ++j) { | |
2073 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2074 | if (res) | |
2075 | return res; | |
2076 | ||
b0f655d0 | 2077 | for (; p; sg = sg_next(sg), ksglen = sg->length, |
45711f1a | 2078 | p = page_address(sg_page(sg))) { |
d6b10348 MC |
2079 | if (usglen <= 0) |
2080 | break; | |
2081 | if (ksglen > usglen) { | |
2082 | if (usglen >= num_xfer) { | |
2083 | if (__copy_to_user(up, p, num_xfer)) | |
1da177e4 | 2084 | return -EFAULT; |
d6b10348 | 2085 | return 0; |
1da177e4 | 2086 | } |
d6b10348 MC |
2087 | if (__copy_to_user(up, p, usglen)) |
2088 | return -EFAULT; | |
2089 | p += usglen; | |
2090 | ksglen -= usglen; | |
2091 | break; | |
2092 | } else { | |
2093 | if (ksglen >= num_xfer) { | |
2094 | if (__copy_to_user(up, p, num_xfer)) | |
2095 | return -EFAULT; | |
1da177e4 | 2096 | return 0; |
d6b10348 MC |
2097 | } |
2098 | if (__copy_to_user(up, p, ksglen)) | |
2099 | return -EFAULT; | |
2100 | up += ksglen; | |
2101 | usglen -= ksglen; | |
1da177e4 | 2102 | } |
d6b10348 MC |
2103 | ++k; |
2104 | if (k >= schp->k_use_sg) | |
2105 | return 0; | |
1da177e4 LT |
2106 | } |
2107 | } | |
d6b10348 | 2108 | |
1da177e4 LT |
2109 | return 0; |
2110 | } | |
2111 | ||
2112 | static int | |
2113 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
2114 | { | |
2115 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 MC |
2116 | struct scatterlist *sg = schp->buffer; |
2117 | int k, num; | |
1da177e4 LT |
2118 | |
2119 | SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", | |
2120 | num_read_xfer)); | |
2121 | if ((!outp) || (num_read_xfer <= 0)) | |
2122 | return 0; | |
d6b10348 | 2123 | |
45711f1a | 2124 | for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) { |
d6b10348 MC |
2125 | num = sg->length; |
2126 | if (num > num_read_xfer) { | |
45711f1a | 2127 | if (__copy_to_user(outp, page_address(sg_page(sg)), |
d6b10348 MC |
2128 | num_read_xfer)) |
2129 | return -EFAULT; | |
2130 | break; | |
2131 | } else { | |
45711f1a | 2132 | if (__copy_to_user(outp, page_address(sg_page(sg)), |
d6b10348 MC |
2133 | num)) |
2134 | return -EFAULT; | |
2135 | num_read_xfer -= num; | |
2136 | if (num_read_xfer <= 0) | |
1da177e4 | 2137 | break; |
d6b10348 | 2138 | outp += num; |
1da177e4 | 2139 | } |
1da177e4 | 2140 | } |
d6b10348 | 2141 | |
1da177e4 LT |
2142 | return 0; |
2143 | } | |
2144 | ||
2145 | static void | |
2146 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2147 | { | |
2148 | Sg_scatter_hold *schp = &sfp->reserve; | |
2149 | ||
2150 | SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); | |
2151 | do { | |
2152 | if (req_size < PAGE_SIZE) | |
2153 | req_size = PAGE_SIZE; | |
2154 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2155 | return; | |
2156 | else | |
2157 | sg_remove_scat(schp); | |
2158 | req_size >>= 1; /* divide by 2 */ | |
2159 | } while (req_size > (PAGE_SIZE / 2)); | |
2160 | } | |
2161 | ||
2162 | static void | |
2163 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2164 | { | |
2165 | Sg_scatter_hold *req_schp = &srp->data; | |
2166 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 MC |
2167 | struct scatterlist *sg = rsv_schp->buffer; |
2168 | int k, num, rem; | |
1da177e4 LT |
2169 | |
2170 | srp->res_used = 1; | |
2171 | SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); | |
eca7be5e | 2172 | rem = size; |
d6b10348 | 2173 | |
b0f655d0 | 2174 | for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { |
d6b10348 MC |
2175 | num = sg->length; |
2176 | if (rem <= num) { | |
2177 | sfp->save_scat_len = num; | |
2178 | sg->length = rem; | |
2179 | req_schp->k_use_sg = k + 1; | |
2180 | req_schp->sglist_len = rsv_schp->sglist_len; | |
2181 | req_schp->buffer = rsv_schp->buffer; | |
2182 | ||
2183 | req_schp->bufflen = size; | |
2184 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2185 | break; | |
2186 | } else | |
2187 | rem -= num; | |
1da177e4 | 2188 | } |
d6b10348 MC |
2189 | |
2190 | if (k >= rsv_schp->k_use_sg) | |
2191 | SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
2192 | } |
2193 | ||
2194 | static void | |
2195 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2196 | { | |
2197 | Sg_scatter_hold *req_schp = &srp->data; | |
2198 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2199 | ||
2200 | SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", | |
2201 | (int) req_schp->k_use_sg)); | |
2202 | if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { | |
d6b10348 | 2203 | struct scatterlist *sg = rsv_schp->buffer; |
1da177e4 LT |
2204 | |
2205 | if (sfp->save_scat_len > 0) | |
d6b10348 | 2206 | (sg + (req_schp->k_use_sg - 1))->length = |
1da177e4 LT |
2207 | (unsigned) sfp->save_scat_len; |
2208 | else | |
2209 | SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); | |
2210 | } | |
2211 | req_schp->k_use_sg = 0; | |
2212 | req_schp->bufflen = 0; | |
2213 | req_schp->buffer = NULL; | |
2214 | req_schp->sglist_len = 0; | |
2215 | sfp->save_scat_len = 0; | |
2216 | srp->res_used = 0; | |
2217 | } | |
2218 | ||
2219 | static Sg_request * | |
2220 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2221 | { | |
2222 | Sg_request *resp; | |
2223 | unsigned long iflags; | |
2224 | ||
2225 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2226 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2227 | /* look for requests that are ready + not SG_IO owned */ | |
2228 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2229 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2230 | resp->done = 2; /* guard against other readers */ | |
2231 | break; | |
2232 | } | |
2233 | } | |
2234 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2235 | return resp; | |
2236 | } | |
2237 | ||
2238 | #ifdef CONFIG_SCSI_PROC_FS | |
2239 | static Sg_request * | |
2240 | sg_get_nth_request(Sg_fd * sfp, int nth) | |
2241 | { | |
2242 | Sg_request *resp; | |
2243 | unsigned long iflags; | |
2244 | int k; | |
2245 | ||
2246 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2247 | for (k = 0, resp = sfp->headrp; resp && (k < nth); | |
2248 | ++k, resp = resp->nextrp) ; | |
2249 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2250 | return resp; | |
2251 | } | |
2252 | #endif | |
2253 | ||
2254 | /* always adds to end of list */ | |
2255 | static Sg_request * | |
2256 | sg_add_request(Sg_fd * sfp) | |
2257 | { | |
2258 | int k; | |
2259 | unsigned long iflags; | |
2260 | Sg_request *resp; | |
2261 | Sg_request *rp = sfp->req_arr; | |
2262 | ||
2263 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2264 | resp = sfp->headrp; | |
2265 | if (!resp) { | |
2266 | memset(rp, 0, sizeof (Sg_request)); | |
2267 | rp->parentfp = sfp; | |
2268 | resp = rp; | |
2269 | sfp->headrp = resp; | |
2270 | } else { | |
2271 | if (0 == sfp->cmd_q) | |
2272 | resp = NULL; /* command queuing disallowed */ | |
2273 | else { | |
2274 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2275 | if (!rp->parentfp) | |
2276 | break; | |
2277 | } | |
2278 | if (k < SG_MAX_QUEUE) { | |
2279 | memset(rp, 0, sizeof (Sg_request)); | |
2280 | rp->parentfp = sfp; | |
2281 | while (resp->nextrp) | |
2282 | resp = resp->nextrp; | |
2283 | resp->nextrp = rp; | |
2284 | resp = rp; | |
2285 | } else | |
2286 | resp = NULL; | |
2287 | } | |
2288 | } | |
2289 | if (resp) { | |
2290 | resp->nextrp = NULL; | |
cb59e840 | 2291 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
2292 | } |
2293 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2294 | return resp; | |
2295 | } | |
2296 | ||
2297 | /* Return of 1 for found; 0 for not found */ | |
2298 | static int | |
2299 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2300 | { | |
2301 | Sg_request *prev_rp; | |
2302 | Sg_request *rp; | |
2303 | unsigned long iflags; | |
2304 | int res = 0; | |
2305 | ||
2306 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2307 | return res; | |
2308 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2309 | prev_rp = sfp->headrp; | |
2310 | if (srp == prev_rp) { | |
2311 | sfp->headrp = prev_rp->nextrp; | |
2312 | prev_rp->parentfp = NULL; | |
2313 | res = 1; | |
2314 | } else { | |
2315 | while ((rp = prev_rp->nextrp)) { | |
2316 | if (srp == rp) { | |
2317 | prev_rp->nextrp = rp->nextrp; | |
2318 | rp->parentfp = NULL; | |
2319 | res = 1; | |
2320 | break; | |
2321 | } | |
2322 | prev_rp = rp; | |
2323 | } | |
2324 | } | |
2325 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2326 | return res; | |
2327 | } | |
2328 | ||
2329 | #ifdef CONFIG_SCSI_PROC_FS | |
2330 | static Sg_fd * | |
2331 | sg_get_nth_sfp(Sg_device * sdp, int nth) | |
2332 | { | |
2333 | Sg_fd *resp; | |
2334 | unsigned long iflags; | |
2335 | int k; | |
2336 | ||
7c07d613 | 2337 | read_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2338 | for (k = 0, resp = sdp->headfp; resp && (k < nth); |
2339 | ++k, resp = resp->nextfp) ; | |
7c07d613 | 2340 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2341 | return resp; |
2342 | } | |
2343 | #endif | |
2344 | ||
2345 | static Sg_fd * | |
2346 | sg_add_sfp(Sg_device * sdp, int dev) | |
2347 | { | |
2348 | Sg_fd *sfp; | |
2349 | unsigned long iflags; | |
44ec9542 | 2350 | int bufflen; |
1da177e4 | 2351 | |
d6b10348 | 2352 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 LT |
2353 | if (!sfp) |
2354 | return NULL; | |
d6b10348 | 2355 | |
1da177e4 LT |
2356 | init_waitqueue_head(&sfp->read_wait); |
2357 | rwlock_init(&sfp->rq_list_lock); | |
2358 | ||
2359 | sfp->timeout = SG_DEFAULT_TIMEOUT; | |
2360 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2361 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2362 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2363 | sdp->device->host->unchecked_isa_dma : 1; | |
2364 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2365 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2366 | sfp->parentdp = sdp; | |
7c07d613 | 2367 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2368 | if (!sdp->headfp) |
2369 | sdp->headfp = sfp; | |
2370 | else { /* add to tail of existing list */ | |
2371 | Sg_fd *pfp = sdp->headfp; | |
2372 | while (pfp->nextfp) | |
2373 | pfp = pfp->nextfp; | |
2374 | pfp->nextfp = sfp; | |
2375 | } | |
7c07d613 | 2376 | write_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 | 2377 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); |
6460e75a DG |
2378 | if (unlikely(sg_big_buff != def_reserved_size)) |
2379 | sg_big_buff = def_reserved_size; | |
2380 | ||
44ec9542 AS |
2381 | bufflen = min_t(int, sg_big_buff, |
2382 | sdp->device->request_queue->max_sectors * 512); | |
2383 | sg_build_reserve(sfp, bufflen); | |
1da177e4 LT |
2384 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", |
2385 | sfp->reserve.bufflen, sfp->reserve.k_use_sg)); | |
2386 | return sfp; | |
2387 | } | |
2388 | ||
2389 | static void | |
2390 | __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2391 | { | |
2392 | Sg_fd *fp; | |
2393 | Sg_fd *prev_fp; | |
2394 | ||
2395 | prev_fp = sdp->headfp; | |
2396 | if (sfp == prev_fp) | |
2397 | sdp->headfp = prev_fp->nextfp; | |
2398 | else { | |
2399 | while ((fp = prev_fp->nextfp)) { | |
2400 | if (sfp == fp) { | |
2401 | prev_fp->nextfp = fp->nextfp; | |
2402 | break; | |
2403 | } | |
2404 | prev_fp = fp; | |
2405 | } | |
2406 | } | |
2407 | if (sfp->reserve.bufflen > 0) { | |
2408 | SCSI_LOG_TIMEOUT(6, | |
2409 | printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2410 | (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); | |
1da177e4 LT |
2411 | sg_remove_scat(&sfp->reserve); |
2412 | } | |
2413 | sfp->parentdp = NULL; | |
2414 | SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); | |
d6b10348 | 2415 | kfree(sfp); |
1da177e4 LT |
2416 | } |
2417 | ||
2418 | /* Returns 0 in normal case, 1 when detached and sdp object removed */ | |
2419 | static int | |
2420 | sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2421 | { | |
2422 | Sg_request *srp; | |
2423 | Sg_request *tsrp; | |
2424 | int dirty = 0; | |
2425 | int res = 0; | |
2426 | ||
2427 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
2428 | tsrp = srp->nextrp; | |
2429 | if (sg_srp_done(srp, sfp)) | |
2430 | sg_finish_rem_req(srp); | |
2431 | else | |
2432 | ++dirty; | |
2433 | } | |
2434 | if (0 == dirty) { | |
2435 | unsigned long iflags; | |
2436 | ||
7c07d613 | 2437 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2438 | __sg_remove_sfp(sdp, sfp); |
2439 | if (sdp->detached && (NULL == sdp->headfp)) { | |
7c07d613 JB |
2440 | idr_remove(&sg_index_idr, sdp->index); |
2441 | kfree(sdp); | |
1da177e4 LT |
2442 | res = 1; |
2443 | } | |
7c07d613 | 2444 | write_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2445 | } else { |
2446 | /* MOD_INC's to inhibit unloading sg and associated adapter driver */ | |
2447 | /* only bump the access_count if we actually succeeded in | |
2448 | * throwing another counter on the host module */ | |
2449 | scsi_device_get(sdp->device); /* XXX: retval ignored? */ | |
2450 | sfp->closed = 1; /* flag dirty state on this fd */ | |
2451 | SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", | |
2452 | dirty)); | |
2453 | } | |
2454 | return res; | |
2455 | } | |
2456 | ||
2457 | static int | |
2458 | sg_res_in_use(Sg_fd * sfp) | |
2459 | { | |
2460 | const Sg_request *srp; | |
2461 | unsigned long iflags; | |
2462 | ||
2463 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2464 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2465 | if (srp->res_used) | |
2466 | break; | |
2467 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2468 | return srp ? 1 : 0; | |
2469 | } | |
2470 | ||
6460e75a | 2471 | /* The size fetched (value output via retSzp) set when non-NULL return */ |
d6b10348 | 2472 | static struct page * |
1da177e4 LT |
2473 | sg_page_malloc(int rqSz, int lowDma, int *retSzp) |
2474 | { | |
d6b10348 | 2475 | struct page *resp = NULL; |
c53033f6 | 2476 | gfp_t page_mask; |
1da177e4 | 2477 | int order, a_size; |
6460e75a | 2478 | int resSz; |
1da177e4 | 2479 | |
6460e75a | 2480 | if ((rqSz <= 0) || (NULL == retSzp)) |
1da177e4 LT |
2481 | return resp; |
2482 | ||
2483 | if (lowDma) | |
f9aed0e2 | 2484 | page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; |
1da177e4 | 2485 | else |
f9aed0e2 | 2486 | page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; |
1da177e4 LT |
2487 | |
2488 | for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; | |
2489 | order++, a_size <<= 1) ; | |
6460e75a | 2490 | resSz = a_size; /* rounded up if necessary */ |
d6b10348 | 2491 | resp = alloc_pages(page_mask, order); |
6460e75a | 2492 | while ((!resp) && order) { |
1da177e4 LT |
2493 | --order; |
2494 | a_size >>= 1; /* divide by 2, until PAGE_SIZE */ | |
d6b10348 | 2495 | resp = alloc_pages(page_mask, order); /* try half */ |
1da177e4 LT |
2496 | resSz = a_size; |
2497 | } | |
2498 | if (resp) { | |
2499 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
41ed16fa | 2500 | memset(page_address(resp), 0, resSz); |
6460e75a | 2501 | *retSzp = resSz; |
1da177e4 LT |
2502 | } |
2503 | return resp; | |
2504 | } | |
2505 | ||
2506 | static void | |
d6b10348 | 2507 | sg_page_free(struct page *page, int size) |
1da177e4 LT |
2508 | { |
2509 | int order, a_size; | |
2510 | ||
d6b10348 | 2511 | if (!page) |
1da177e4 LT |
2512 | return; |
2513 | for (order = 0, a_size = PAGE_SIZE; a_size < size; | |
2514 | order++, a_size <<= 1) ; | |
d6b10348 | 2515 | __free_pages(page, order); |
1da177e4 LT |
2516 | } |
2517 | ||
1da177e4 | 2518 | #ifdef CONFIG_SCSI_PROC_FS |
7c07d613 JB |
2519 | static int |
2520 | sg_idr_max_id(int id, void *p, void *data) | |
2521 | { | |
2522 | int *k = data; | |
2523 | ||
2524 | if (*k < id) | |
2525 | *k = id; | |
2526 | ||
2527 | return 0; | |
2528 | } | |
2529 | ||
1da177e4 LT |
2530 | static int |
2531 | sg_last_dev(void) | |
2532 | { | |
53474c04 | 2533 | int k = -1; |
1da177e4 LT |
2534 | unsigned long iflags; |
2535 | ||
7c07d613 JB |
2536 | read_lock_irqsave(&sg_index_lock, iflags); |
2537 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2538 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 LT |
2539 | return k + 1; /* origin 1 */ |
2540 | } | |
2541 | #endif | |
2542 | ||
2543 | static Sg_device * | |
2544 | sg_get_dev(int dev) | |
2545 | { | |
7c07d613 | 2546 | Sg_device *sdp; |
1da177e4 LT |
2547 | unsigned long iflags; |
2548 | ||
7c07d613 JB |
2549 | read_lock_irqsave(&sg_index_lock, iflags); |
2550 | sdp = idr_find(&sg_index_idr, dev); | |
2551 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
2552 | ||
1da177e4 LT |
2553 | return sdp; |
2554 | } | |
2555 | ||
2556 | #ifdef CONFIG_SCSI_PROC_FS | |
2557 | ||
2558 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2559 | ||
2560 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2561 | ||
2562 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2563 | ||
2564 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2565 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2566 | size_t count, loff_t *off); | |
2567 | static struct file_operations adio_fops = { | |
2568 | /* .owner, .read and .llseek added in sg_proc_init() */ | |
2569 | .open = sg_proc_single_open_adio, | |
2570 | .write = sg_proc_write_adio, | |
2571 | .release = single_release, | |
2572 | }; | |
2573 | ||
2574 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2575 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2576 | const char __user *buffer, size_t count, loff_t *off); | |
2577 | static struct file_operations dressz_fops = { | |
2578 | .open = sg_proc_single_open_dressz, | |
2579 | .write = sg_proc_write_dressz, | |
2580 | .release = single_release, | |
2581 | }; | |
2582 | ||
2583 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2584 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
2585 | static struct file_operations version_fops = { | |
2586 | .open = sg_proc_single_open_version, | |
2587 | .release = single_release, | |
2588 | }; | |
2589 | ||
2590 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2591 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
2592 | static struct file_operations devhdr_fops = { | |
2593 | .open = sg_proc_single_open_devhdr, | |
2594 | .release = single_release, | |
2595 | }; | |
2596 | ||
2597 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2598 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2599 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2600 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2601 | static void dev_seq_stop(struct seq_file *s, void *v); | |
2602 | static struct file_operations dev_fops = { | |
2603 | .open = sg_proc_open_dev, | |
2604 | .release = seq_release, | |
2605 | }; | |
2606 | static struct seq_operations dev_seq_ops = { | |
2607 | .start = dev_seq_start, | |
2608 | .next = dev_seq_next, | |
2609 | .stop = dev_seq_stop, | |
2610 | .show = sg_proc_seq_show_dev, | |
2611 | }; | |
2612 | ||
2613 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2614 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
2615 | static struct file_operations devstrs_fops = { | |
2616 | .open = sg_proc_open_devstrs, | |
2617 | .release = seq_release, | |
2618 | }; | |
2619 | static struct seq_operations devstrs_seq_ops = { | |
2620 | .start = dev_seq_start, | |
2621 | .next = dev_seq_next, | |
2622 | .stop = dev_seq_stop, | |
2623 | .show = sg_proc_seq_show_devstrs, | |
2624 | }; | |
2625 | ||
2626 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2627 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
2628 | static struct file_operations debug_fops = { | |
2629 | .open = sg_proc_open_debug, | |
2630 | .release = seq_release, | |
2631 | }; | |
2632 | static struct seq_operations debug_seq_ops = { | |
2633 | .start = dev_seq_start, | |
2634 | .next = dev_seq_next, | |
2635 | .stop = dev_seq_stop, | |
2636 | .show = sg_proc_seq_show_debug, | |
2637 | }; | |
2638 | ||
2639 | ||
2640 | struct sg_proc_leaf { | |
2641 | const char * name; | |
2642 | struct file_operations * fops; | |
2643 | }; | |
2644 | ||
2645 | static struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2646 | {"allow_dio", &adio_fops}, | |
2647 | {"debug", &debug_fops}, | |
2648 | {"def_reserved_size", &dressz_fops}, | |
2649 | {"device_hdr", &devhdr_fops}, | |
2650 | {"devices", &dev_fops}, | |
2651 | {"device_strs", &devstrs_fops}, | |
2652 | {"version", &version_fops} | |
2653 | }; | |
2654 | ||
2655 | static int | |
2656 | sg_proc_init(void) | |
2657 | { | |
2658 | int k, mask; | |
6391a113 | 2659 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2660 | struct sg_proc_leaf * leaf; |
2661 | ||
66600221 | 2662 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2663 | if (!sg_proc_sgp) |
2664 | return 1; | |
2665 | for (k = 0; k < num_leaves; ++k) { | |
2666 | leaf = &sg_proc_leaf_arr[k]; | |
2667 | mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
a973909f DL |
2668 | leaf->fops->owner = THIS_MODULE; |
2669 | leaf->fops->read = seq_read; | |
2670 | leaf->fops->llseek = seq_lseek; | |
2671 | proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); | |
1da177e4 LT |
2672 | } |
2673 | return 0; | |
2674 | } | |
2675 | ||
2676 | static void | |
2677 | sg_proc_cleanup(void) | |
2678 | { | |
2679 | int k; | |
6391a113 | 2680 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2681 | |
2682 | if (!sg_proc_sgp) | |
2683 | return; | |
2684 | for (k = 0; k < num_leaves; ++k) | |
2685 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2686 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2687 | } | |
2688 | ||
2689 | ||
2690 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2691 | { | |
2692 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2693 | return 0; | |
2694 | } | |
2695 | ||
2696 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2697 | { | |
2698 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2699 | } | |
2700 | ||
2701 | static ssize_t | |
2702 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2703 | size_t count, loff_t *off) | |
2704 | { | |
2705 | int num; | |
2706 | char buff[11]; | |
2707 | ||
2708 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2709 | return -EACCES; | |
2710 | num = (count < 10) ? count : 10; | |
2711 | if (copy_from_user(buff, buffer, num)) | |
2712 | return -EFAULT; | |
2713 | buff[num] = '\0'; | |
2714 | sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; | |
2715 | return count; | |
2716 | } | |
2717 | ||
2718 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2719 | { | |
2720 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2721 | } | |
2722 | ||
2723 | static ssize_t | |
2724 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2725 | size_t count, loff_t *off) | |
2726 | { | |
2727 | int num; | |
2728 | unsigned long k = ULONG_MAX; | |
2729 | char buff[11]; | |
2730 | ||
2731 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2732 | return -EACCES; | |
2733 | num = (count < 10) ? count : 10; | |
2734 | if (copy_from_user(buff, buffer, num)) | |
2735 | return -EFAULT; | |
2736 | buff[num] = '\0'; | |
2737 | k = simple_strtoul(buff, NULL, 10); | |
2738 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2739 | sg_big_buff = k; | |
2740 | return count; | |
2741 | } | |
2742 | return -ERANGE; | |
2743 | } | |
2744 | ||
2745 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2746 | { | |
2747 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2748 | sg_version_date); | |
2749 | return 0; | |
2750 | } | |
2751 | ||
2752 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2753 | { | |
2754 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2755 | } | |
2756 | ||
2757 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2758 | { | |
2759 | seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" | |
2760 | "online\n"); | |
2761 | return 0; | |
2762 | } | |
2763 | ||
2764 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2765 | { | |
2766 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2767 | } | |
2768 | ||
2769 | struct sg_proc_deviter { | |
2770 | loff_t index; | |
2771 | size_t max; | |
2772 | }; | |
2773 | ||
2774 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2775 | { | |
2776 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2777 | ||
729d70f5 | 2778 | s->private = it; |
1da177e4 LT |
2779 | if (! it) |
2780 | return NULL; | |
729d70f5 | 2781 | |
1da177e4 LT |
2782 | it->index = *pos; |
2783 | it->max = sg_last_dev(); | |
2784 | if (it->index >= it->max) | |
729d70f5 | 2785 | return NULL; |
1da177e4 | 2786 | return it; |
1da177e4 LT |
2787 | } |
2788 | ||
2789 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2790 | { | |
729d70f5 | 2791 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2792 | |
2793 | *pos = ++it->index; | |
2794 | return (it->index < it->max) ? it : NULL; | |
2795 | } | |
2796 | ||
2797 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2798 | { | |
729d70f5 | 2799 | kfree(s->private); |
1da177e4 LT |
2800 | } |
2801 | ||
2802 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2803 | { | |
2804 | return seq_open(file, &dev_seq_ops); | |
2805 | } | |
2806 | ||
2807 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2808 | { | |
2809 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2810 | Sg_device *sdp; | |
2811 | struct scsi_device *scsidp; | |
2812 | ||
2813 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2814 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2815 | seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", | |
2816 | scsidp->host->host_no, scsidp->channel, | |
2817 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2818 | 1, | |
2819 | (int) scsidp->queue_depth, | |
2820 | (int) scsidp->device_busy, | |
2821 | (int) scsi_device_online(scsidp)); | |
2822 | else | |
2823 | seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2824 | return 0; | |
2825 | } | |
2826 | ||
2827 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
2828 | { | |
2829 | return seq_open(file, &devstrs_seq_ops); | |
2830 | } | |
2831 | ||
2832 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
2833 | { | |
2834 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2835 | Sg_device *sdp; | |
2836 | struct scsi_device *scsidp; | |
2837 | ||
2838 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2839 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2840 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
2841 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2842 | else | |
2843 | seq_printf(s, "<no active device>\n"); | |
2844 | return 0; | |
2845 | } | |
2846 | ||
2847 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) | |
2848 | { | |
2849 | int k, m, new_interface, blen, usg; | |
2850 | Sg_request *srp; | |
2851 | Sg_fd *fp; | |
2852 | const sg_io_hdr_t *hp; | |
2853 | const char * cp; | |
cb59e840 | 2854 | unsigned int ms; |
1da177e4 LT |
2855 | |
2856 | for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { | |
2857 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " | |
2858 | "(res)sgat=%d low_dma=%d\n", k + 1, | |
2859 | jiffies_to_msecs(fp->timeout), | |
2860 | fp->reserve.bufflen, | |
2861 | (int) fp->reserve.k_use_sg, | |
2862 | (int) fp->low_dma); | |
2863 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", | |
2864 | (int) fp->cmd_q, (int) fp->force_packid, | |
2865 | (int) fp->keep_orphan, (int) fp->closed); | |
2866 | for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { | |
2867 | hp = &srp->header; | |
2868 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2869 | if (srp->res_used) { | |
2870 | if (new_interface && | |
2871 | (SG_FLAG_MMAP_IO & hp->flags)) | |
2872 | cp = " mmap>> "; | |
2873 | else | |
2874 | cp = " rb>> "; | |
2875 | } else { | |
2876 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2877 | cp = " dio>> "; | |
2878 | else | |
2879 | cp = " "; | |
2880 | } | |
2881 | seq_printf(s, cp); | |
d6b10348 MC |
2882 | blen = srp->data.bufflen; |
2883 | usg = srp->data.k_use_sg; | |
1da177e4 LT |
2884 | seq_printf(s, srp->done ? |
2885 | ((1 == srp->done) ? "rcv:" : "fin:") | |
d6b10348 | 2886 | : "act:"); |
1da177e4 LT |
2887 | seq_printf(s, " id=%d blen=%d", |
2888 | srp->header.pack_id, blen); | |
2889 | if (srp->done) | |
2890 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 | 2891 | else { |
2892 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2893 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 | 2894 | (new_interface ? hp->timeout : |
2895 | jiffies_to_msecs(fp->timeout)), | |
2896 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2897 | } | |
1da177e4 LT |
2898 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2899 | (int) srp->data.cmd_opcode); | |
2900 | } | |
2901 | if (0 == m) | |
2902 | seq_printf(s, " No requests active\n"); | |
2903 | } | |
2904 | } | |
2905 | ||
2906 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
2907 | { | |
2908 | return seq_open(file, &debug_seq_ops); | |
2909 | } | |
2910 | ||
2911 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
2912 | { | |
2913 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2914 | Sg_device *sdp; | |
2915 | ||
2916 | if (it && (0 == it->index)) { | |
7c07d613 JB |
2917 | seq_printf(s, "max_active_device=%d(origin 1)\n", |
2918 | (int)it->max); | |
1da177e4 LT |
2919 | seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); |
2920 | } | |
2921 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2922 | if (sdp) { | |
2923 | struct scsi_device *scsidp = sdp->device; | |
2924 | ||
2925 | if (NULL == scsidp) { | |
2926 | seq_printf(s, "device %d detached ??\n", | |
2927 | (int)it->index); | |
2928 | return 0; | |
2929 | } | |
2930 | ||
2931 | if (sg_get_nth_sfp(sdp, 0)) { | |
2932 | seq_printf(s, " >>> device=%s ", | |
2933 | sdp->disk->disk_name); | |
2934 | if (sdp->detached) | |
2935 | seq_printf(s, "detached pending close "); | |
2936 | else | |
2937 | seq_printf | |
2938 | (s, "scsi%d chan=%d id=%d lun=%d em=%d", | |
2939 | scsidp->host->host_no, | |
2940 | scsidp->channel, scsidp->id, | |
2941 | scsidp->lun, | |
2942 | scsidp->host->hostt->emulated); | |
2943 | seq_printf(s, " sg_tablesize=%d excl=%d\n", | |
2944 | sdp->sg_tablesize, sdp->exclude); | |
2945 | } | |
2946 | sg_proc_debug_helper(s, sdp); | |
2947 | } | |
2948 | return 0; | |
2949 | } | |
2950 | ||
2951 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2952 | ||
2953 | module_init(init_sg); | |
2954 | module_exit(exit_sg); |