]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * History: | |
3 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), | |
4 | * to allow user process control of SCSI devices. | |
5 | * Development Sponsored by Killy Corp. NY NY | |
6 | * | |
7 | * Original driver (sg.c): | |
8 | * Copyright (C) 1992 Lawrence Foard | |
9 | * Version 2 and 3 extensions to driver: | |
10 | * Copyright (C) 1998 - 2005 Douglas Gilbert | |
11 | * | |
12 | * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | ||
cb59e840 DG |
21 | static int sg_version_num = 30533; /* 2 digits for each component */ |
22 | #define SG_VERSION_STR "3.5.33" | |
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 | */ | |
31 | #include <linux/config.h> | |
32 | #include <linux/module.h> | |
33 | ||
34 | #include <linux/fs.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/sched.h> | |
37 | #include <linux/string.h> | |
38 | #include <linux/mm.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/mtio.h> | |
41 | #include <linux/ioctl.h> | |
42 | #include <linux/fcntl.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/poll.h> | |
45 | #include <linux/smp_lock.h> | |
46 | #include <linux/moduleparam.h> | |
47 | #include <linux/devfs_fs_kernel.h> | |
48 | #include <linux/cdev.h> | |
49 | #include <linux/seq_file.h> | |
50 | #include <linux/blkdev.h> | |
51 | #include <linux/delay.h> | |
378f058c | 52 | #include <linux/scatterlist.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> | |
1c8e71d7 | 65 | static char *sg_version_date = "20050908"; |
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 | ||
99 | #define SG_SECTOR_SZ 512 | |
100 | #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) | |
101 | ||
102 | #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ | |
103 | ||
d8539d81 DT |
104 | static int sg_add(struct class_device *, struct class_interface *); |
105 | static void sg_remove(struct class_device *, struct class_interface *); | |
1da177e4 | 106 | |
1da177e4 LT |
107 | static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock |
108 | file descriptor list for device */ | |
109 | ||
110 | static struct class_interface sg_interface = { | |
111 | .add = sg_add, | |
112 | .remove = sg_remove, | |
113 | }; | |
114 | ||
115 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
116 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
117 | unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ | |
118 | unsigned bufflen; /* Size of (aggregate) data buffer */ | |
119 | unsigned b_malloc_len; /* actual len malloc'ed in buffer */ | |
d6b10348 | 120 | struct scatterlist *buffer;/* scatter list */ |
1da177e4 LT |
121 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
122 | unsigned char cmd_opcode; /* first byte of command */ | |
123 | } Sg_scatter_hold; | |
124 | ||
125 | struct sg_device; /* forward declarations */ | |
126 | struct sg_fd; | |
127 | ||
128 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
1da177e4 LT |
129 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ |
130 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
131 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
132 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
d6b10348 | 133 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
1da177e4 LT |
134 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
135 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
136 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
137 | volatile char done; /* 0->before bh, 1->before read, 2->read */ | |
138 | } Sg_request; | |
139 | ||
140 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
141 | struct sg_fd *nextfp; /* NULL when last opened fd on this device */ | |
142 | struct sg_device *parentdp; /* owning device */ | |
143 | wait_queue_head_t read_wait; /* queue read until command done */ | |
144 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
145 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
146 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
147 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
148 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
149 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
150 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
151 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
152 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
153 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
154 | volatile char closed; /* 1 -> fd closed but request(s) outstanding */ | |
155 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
156 | char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ | |
157 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
158 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
159 | } Sg_fd; | |
160 | ||
161 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
162 | struct scsi_device *device; | |
163 | wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ | |
164 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
165 | Sg_fd *headfp; /* first open fd belonging to this device */ | |
166 | volatile char detached; /* 0->attached, 1->detached pending removal */ | |
167 | volatile char exclude; /* opened for exclusive access */ | |
168 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ | |
169 | struct gendisk *disk; | |
170 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
171 | } Sg_device; | |
172 | ||
173 | static int sg_fasync(int fd, struct file *filp, int mode); | |
d6b10348 MC |
174 | /* tasklet or soft irq callback */ |
175 | static void sg_cmd_done(void *data, char *sense, int result, int resid); | |
1da177e4 LT |
176 | static int sg_start_req(Sg_request * srp); |
177 | static void sg_finish_rem_req(Sg_request * srp); | |
178 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); | |
179 | static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, | |
180 | int tablesize); | |
181 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, | |
182 | Sg_request * srp); | |
183 | static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, | |
184 | int blocking, int read_only, Sg_request ** o_srp); | |
185 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
186 | unsigned char *cmnd, int timeout, int blocking); | |
187 | static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
188 | int wr_xf, int *countp, unsigned char __user **up); | |
189 | static int sg_write_xfer(Sg_request * srp); | |
190 | static int sg_read_xfer(Sg_request * srp); | |
191 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); | |
192 | static void sg_remove_scat(Sg_scatter_hold * schp); | |
193 | static void sg_build_reserve(Sg_fd * sfp, int req_size); | |
194 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
195 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
d6b10348 MC |
196 | static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); |
197 | static void sg_page_free(struct page *page, int size); | |
1da177e4 LT |
198 | static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); |
199 | static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
200 | static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
201 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); | |
202 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
203 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
204 | static int sg_res_in_use(Sg_fd * sfp); | |
205 | static int sg_allow_access(unsigned char opcode, char dev_type); | |
206 | static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); | |
207 | static Sg_device *sg_get_dev(int dev); | |
1da177e4 LT |
208 | #ifdef CONFIG_SCSI_PROC_FS |
209 | static int sg_last_dev(void); | |
210 | #endif | |
211 | ||
212 | static Sg_device **sg_dev_arr = NULL; | |
213 | static int sg_dev_max; | |
214 | static int sg_nr_dev; | |
215 | ||
216 | #define SZ_SG_HEADER sizeof(struct sg_header) | |
217 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
218 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
219 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
220 | ||
221 | static int | |
222 | sg_open(struct inode *inode, struct file *filp) | |
223 | { | |
224 | int dev = iminor(inode); | |
225 | int flags = filp->f_flags; | |
d6b10348 | 226 | struct request_queue *q; |
1da177e4 LT |
227 | Sg_device *sdp; |
228 | Sg_fd *sfp; | |
229 | int res; | |
230 | int retval; | |
231 | ||
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); | |
235 | if ((!sdp) || (!sdp->device)) | |
236 | return -ENXIO; | |
237 | if (sdp->detached) | |
238 | return -ENODEV; | |
239 | ||
240 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
241 | /* Prevent the device driver from vanishing while we sleep */ | |
242 | retval = scsi_device_get(sdp->device); | |
243 | if (retval) | |
244 | return retval; | |
245 | ||
246 | if (!((flags & O_NONBLOCK) || | |
247 | scsi_block_when_processing_errors(sdp->device))) { | |
248 | retval = -ENXIO; | |
249 | /* we are in error recovery for this device */ | |
250 | goto error_out; | |
251 | } | |
252 | ||
253 | if (flags & O_EXCL) { | |
254 | if (O_RDONLY == (flags & O_ACCMODE)) { | |
255 | retval = -EPERM; /* Can't lock it with read only access */ | |
256 | goto error_out; | |
257 | } | |
258 | if (sdp->headfp && (flags & O_NONBLOCK)) { | |
259 | retval = -EBUSY; | |
260 | goto error_out; | |
261 | } | |
262 | res = 0; | |
263 | __wait_event_interruptible(sdp->o_excl_wait, | |
264 | ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); | |
265 | if (res) { | |
266 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
267 | goto error_out; | |
268 | } | |
269 | } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ | |
270 | if (flags & O_NONBLOCK) { | |
271 | retval = -EBUSY; | |
272 | goto error_out; | |
273 | } | |
274 | res = 0; | |
275 | __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), | |
276 | res); | |
277 | if (res) { | |
278 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
279 | goto error_out; | |
280 | } | |
281 | } | |
282 | if (sdp->detached) { | |
283 | retval = -ENODEV; | |
284 | goto error_out; | |
285 | } | |
286 | if (!sdp->headfp) { /* no existing opens on this device */ | |
287 | sdp->sgdebug = 0; | |
d6b10348 MC |
288 | q = sdp->device->request_queue; |
289 | sdp->sg_tablesize = min(q->max_hw_segments, | |
290 | q->max_phys_segments); | |
1da177e4 LT |
291 | } |
292 | if ((sfp = sg_add_sfp(sdp, dev))) | |
293 | filp->private_data = sfp; | |
294 | else { | |
295 | if (flags & O_EXCL) | |
296 | sdp->exclude = 0; /* undo if error */ | |
297 | retval = -ENOMEM; | |
298 | goto error_out; | |
299 | } | |
300 | return 0; | |
301 | ||
302 | error_out: | |
303 | scsi_device_put(sdp->device); | |
304 | return retval; | |
305 | } | |
306 | ||
307 | /* Following function was formerly called 'sg_close' */ | |
308 | static int | |
309 | sg_release(struct inode *inode, struct file *filp) | |
310 | { | |
311 | Sg_device *sdp; | |
312 | Sg_fd *sfp; | |
313 | ||
314 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
315 | return -ENXIO; | |
316 | SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); | |
317 | sg_fasync(-1, filp, 0); /* remove filp from async notification list */ | |
318 | if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ | |
319 | if (!sdp->detached) { | |
320 | scsi_device_put(sdp->device); | |
321 | } | |
322 | sdp->exclude = 0; | |
323 | wake_up_interruptible(&sdp->o_excl_wait); | |
324 | } | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static ssize_t | |
329 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
330 | { | |
1da177e4 LT |
331 | Sg_device *sdp; |
332 | Sg_fd *sfp; | |
333 | Sg_request *srp; | |
334 | int req_pack_id = -1; | |
1da177e4 | 335 | sg_io_hdr_t *hp; |
cb59e840 DG |
336 | struct sg_header *old_hdr = NULL; |
337 | int retval = 0; | |
1da177e4 LT |
338 | |
339 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
340 | return -ENXIO; | |
341 | SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", | |
342 | sdp->disk->disk_name, (int) count)); | |
d6b10348 | 343 | |
1da177e4 LT |
344 | if (!access_ok(VERIFY_WRITE, buf, count)) |
345 | return -EFAULT; | |
346 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 DG |
347 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
348 | if (!old_hdr) | |
349 | return -ENOMEM; | |
350 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
351 | retval = -EFAULT; | |
352 | goto free_old_hdr; | |
353 | } | |
354 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 355 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 DG |
356 | sg_io_hdr_t *new_hdr; |
357 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
358 | if (!new_hdr) { | |
359 | retval = -ENOMEM; | |
360 | goto free_old_hdr; | |
361 | } | |
362 | retval =__copy_from_user | |
363 | (new_hdr, buf, SZ_SG_IO_HDR); | |
364 | req_pack_id = new_hdr->pack_id; | |
365 | kfree(new_hdr); | |
366 | if (retval) { | |
367 | retval = -EFAULT; | |
368 | goto free_old_hdr; | |
369 | } | |
1da177e4 LT |
370 | } |
371 | } else | |
cb59e840 | 372 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
373 | } |
374 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
375 | if (!srp) { /* now wait on packet to arrive */ | |
cb59e840 DG |
376 | if (sdp->detached) { |
377 | retval = -ENODEV; | |
378 | goto free_old_hdr; | |
379 | } | |
380 | if (filp->f_flags & O_NONBLOCK) { | |
381 | retval = -EAGAIN; | |
382 | goto free_old_hdr; | |
383 | } | |
1da177e4 | 384 | while (1) { |
cb59e840 | 385 | retval = 0; /* following macro beats race condition */ |
1da177e4 | 386 | __wait_event_interruptible(sfp->read_wait, |
cb59e840 DG |
387 | (sdp->detached || |
388 | (srp = sg_get_rq_mark(sfp, req_pack_id))), | |
389 | retval); | |
390 | if (sdp->detached) { | |
391 | retval = -ENODEV; | |
392 | goto free_old_hdr; | |
393 | } | |
394 | if (0 == retval) | |
1da177e4 | 395 | break; |
cb59e840 DG |
396 | |
397 | /* -ERESTARTSYS as signal hit process */ | |
398 | goto free_old_hdr; | |
1da177e4 LT |
399 | } |
400 | } | |
cb59e840 DG |
401 | if (srp->header.interface_id != '\0') { |
402 | retval = sg_new_read(sfp, buf, count, srp); | |
403 | goto free_old_hdr; | |
404 | } | |
1da177e4 LT |
405 | |
406 | hp = &srp->header; | |
cb59e840 DG |
407 | if (old_hdr == NULL) { |
408 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
409 | if (! old_hdr) { | |
410 | retval = -ENOMEM; | |
411 | goto free_old_hdr; | |
412 | } | |
413 | } | |
414 | memset(old_hdr, 0, SZ_SG_HEADER); | |
415 | old_hdr->reply_len = (int) hp->timeout; | |
416 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
417 | old_hdr->pack_id = hp->pack_id; | |
418 | old_hdr->twelve_byte = | |
1da177e4 | 419 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 DG |
420 | old_hdr->target_status = hp->masked_status; |
421 | old_hdr->host_status = hp->host_status; | |
422 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
423 | if ((CHECK_CONDITION & hp->masked_status) || |
424 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 DG |
425 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
426 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
427 | switch (hp->host_status) { |
428 | /* This setup of 'result' is for backward compatibility and is best | |
429 | ignored by the user who should use target, host + driver status */ | |
430 | case DID_OK: | |
431 | case DID_PASSTHROUGH: | |
432 | case DID_SOFT_ERROR: | |
cb59e840 | 433 | old_hdr->result = 0; |
1da177e4 LT |
434 | break; |
435 | case DID_NO_CONNECT: | |
436 | case DID_BUS_BUSY: | |
437 | case DID_TIME_OUT: | |
cb59e840 | 438 | old_hdr->result = EBUSY; |
1da177e4 LT |
439 | break; |
440 | case DID_BAD_TARGET: | |
441 | case DID_ABORT: | |
442 | case DID_PARITY: | |
443 | case DID_RESET: | |
444 | case DID_BAD_INTR: | |
cb59e840 | 445 | old_hdr->result = EIO; |
1da177e4 LT |
446 | break; |
447 | case DID_ERROR: | |
cb59e840 | 448 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
449 | hp->masked_status == GOOD) ? 0 : EIO; |
450 | break; | |
451 | default: | |
cb59e840 | 452 | old_hdr->result = EIO; |
1da177e4 LT |
453 | break; |
454 | } | |
455 | ||
456 | /* Now copy the result back to the user buffer. */ | |
457 | if (count >= SZ_SG_HEADER) { | |
cb59e840 DG |
458 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
459 | retval = -EFAULT; | |
460 | goto free_old_hdr; | |
461 | } | |
1da177e4 | 462 | buf += SZ_SG_HEADER; |
cb59e840 DG |
463 | if (count > old_hdr->reply_len) |
464 | count = old_hdr->reply_len; | |
1da177e4 | 465 | if (count > SZ_SG_HEADER) { |
cb59e840 DG |
466 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
467 | retval = -EFAULT; | |
468 | goto free_old_hdr; | |
469 | } | |
1da177e4 LT |
470 | } |
471 | } else | |
cb59e840 | 472 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 473 | sg_finish_rem_req(srp); |
cb59e840 DG |
474 | retval = count; |
475 | free_old_hdr: | |
c9475cb0 | 476 | kfree(old_hdr); |
cb59e840 | 477 | return retval; |
1da177e4 LT |
478 | } |
479 | ||
480 | static ssize_t | |
481 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
482 | { | |
483 | sg_io_hdr_t *hp = &srp->header; | |
484 | int err = 0; | |
485 | int len; | |
486 | ||
487 | if (count < SZ_SG_IO_HDR) { | |
488 | err = -EINVAL; | |
489 | goto err_out; | |
490 | } | |
491 | hp->sb_len_wr = 0; | |
492 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
493 | if ((CHECK_CONDITION & hp->masked_status) || | |
494 | (DRIVER_SENSE & hp->driver_status)) { | |
d6b10348 | 495 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
496 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
497 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
498 | len = (len > sb_len) ? sb_len : len; | |
499 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
500 | err = -EFAULT; | |
501 | goto err_out; | |
502 | } | |
503 | hp->sb_len_wr = len; | |
504 | } | |
505 | } | |
506 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
507 | hp->info |= SG_INFO_CHECK; | |
508 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
509 | err = -EFAULT; | |
510 | goto err_out; | |
511 | } | |
512 | err = sg_read_xfer(srp); | |
513 | err_out: | |
514 | sg_finish_rem_req(srp); | |
515 | return (0 == err) ? count : err; | |
516 | } | |
517 | ||
518 | static ssize_t | |
519 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
520 | { | |
521 | int mxsize, cmd_size, k; | |
522 | int input_size, blocking; | |
523 | unsigned char opcode; | |
524 | Sg_device *sdp; | |
525 | Sg_fd *sfp; | |
526 | Sg_request *srp; | |
527 | struct sg_header old_hdr; | |
528 | sg_io_hdr_t *hp; | |
d6b10348 | 529 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
530 | |
531 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
532 | return -ENXIO; | |
533 | SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", | |
534 | sdp->disk->disk_name, (int) count)); | |
535 | if (sdp->detached) | |
536 | return -ENODEV; | |
537 | if (!((filp->f_flags & O_NONBLOCK) || | |
538 | scsi_block_when_processing_errors(sdp->device))) | |
539 | return -ENXIO; | |
540 | ||
541 | if (!access_ok(VERIFY_READ, buf, count)) | |
542 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
543 | if (count < SZ_SG_HEADER) | |
544 | return -EIO; | |
545 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
546 | return -EFAULT; | |
547 | blocking = !(filp->f_flags & O_NONBLOCK); | |
548 | if (old_hdr.reply_len < 0) | |
549 | return sg_new_write(sfp, buf, count, blocking, 0, NULL); | |
550 | if (count < (SZ_SG_HEADER + 6)) | |
551 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
552 | ||
553 | if (!(srp = sg_add_request(sfp))) { | |
554 | SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); | |
555 | return -EDOM; | |
556 | } | |
557 | buf += SZ_SG_HEADER; | |
558 | __get_user(opcode, buf); | |
559 | if (sfp->next_cmd_len > 0) { | |
560 | if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { | |
561 | SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); | |
562 | sfp->next_cmd_len = 0; | |
563 | sg_remove_request(sfp, srp); | |
564 | return -EIO; | |
565 | } | |
566 | cmd_size = sfp->next_cmd_len; | |
567 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
568 | } else { | |
569 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
570 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
571 | cmd_size = 12; | |
572 | } | |
573 | SCSI_LOG_TIMEOUT(4, printk( | |
574 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
575 | /* Determine buffer size. */ | |
576 | input_size = count - cmd_size; | |
577 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
578 | mxsize -= SZ_SG_HEADER; | |
579 | input_size -= SZ_SG_HEADER; | |
580 | if (input_size < 0) { | |
581 | sg_remove_request(sfp, srp); | |
582 | return -EIO; /* User did not pass enough bytes for this command. */ | |
583 | } | |
584 | hp = &srp->header; | |
585 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
586 | hp->cmd_len = (unsigned char) cmd_size; | |
587 | hp->iovec_count = 0; | |
588 | hp->mx_sb_len = 0; | |
589 | if (input_size > 0) | |
590 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
591 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
592 | else | |
593 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
594 | hp->dxfer_len = mxsize; | |
595 | hp->dxferp = (char __user *)buf + cmd_size; | |
596 | hp->sbp = NULL; | |
597 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
598 | hp->flags = input_size; /* structure abuse ... */ | |
599 | hp->pack_id = old_hdr.pack_id; | |
600 | hp->usr_ptr = NULL; | |
601 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
602 | return -EFAULT; | |
603 | /* | |
604 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
605 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
606 | * is a non-zero input_size, so emit a warning. | |
607 | */ | |
608 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) | |
609 | if (printk_ratelimit()) | |
610 | printk(KERN_WARNING | |
611 | "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" | |
612 | "guessing data in;\n" KERN_WARNING " " | |
613 | "program %s not setting count and/or reply_len properly\n", | |
614 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
615 | input_size, (unsigned int) cmnd[0], | |
616 | current->comm); | |
617 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); | |
618 | return (k < 0) ? k : count; | |
619 | } | |
620 | ||
621 | static ssize_t | |
622 | sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, | |
623 | int blocking, int read_only, Sg_request ** o_srp) | |
624 | { | |
625 | int k; | |
626 | Sg_request *srp; | |
627 | sg_io_hdr_t *hp; | |
d6b10348 | 628 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
629 | int timeout; |
630 | unsigned long ul_timeout; | |
631 | ||
632 | if (count < SZ_SG_IO_HDR) | |
633 | return -EINVAL; | |
634 | if (!access_ok(VERIFY_READ, buf, count)) | |
635 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
636 | ||
637 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
638 | if (!(srp = sg_add_request(sfp))) { | |
639 | SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); | |
640 | return -EDOM; | |
641 | } | |
642 | hp = &srp->header; | |
643 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
644 | sg_remove_request(sfp, srp); | |
645 | return -EFAULT; | |
646 | } | |
647 | if (hp->interface_id != 'S') { | |
648 | sg_remove_request(sfp, srp); | |
649 | return -ENOSYS; | |
650 | } | |
651 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
652 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
653 | sg_remove_request(sfp, srp); | |
654 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
655 | } | |
656 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
657 | sg_remove_request(sfp, srp); | |
658 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
659 | } | |
660 | if (sg_res_in_use(sfp)) { | |
661 | sg_remove_request(sfp, srp); | |
662 | return -EBUSY; /* reserve buffer already being used */ | |
663 | } | |
664 | } | |
665 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
666 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
667 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
668 | sg_remove_request(sfp, srp); | |
669 | return -EMSGSIZE; | |
670 | } | |
671 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
672 | sg_remove_request(sfp, srp); | |
673 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
674 | } | |
675 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
676 | sg_remove_request(sfp, srp); | |
677 | return -EFAULT; | |
678 | } | |
679 | if (read_only && | |
680 | (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { | |
681 | sg_remove_request(sfp, srp); | |
682 | return -EPERM; | |
683 | } | |
684 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
685 | if (k < 0) | |
686 | return k; | |
687 | if (o_srp) | |
688 | *o_srp = srp; | |
689 | return count; | |
690 | } | |
691 | ||
692 | static int | |
693 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
694 | unsigned char *cmnd, int timeout, int blocking) | |
695 | { | |
d6b10348 | 696 | int k, data_dir; |
1da177e4 LT |
697 | Sg_device *sdp = sfp->parentdp; |
698 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
699 | |
700 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
701 | hp->status = 0; | |
702 | hp->masked_status = 0; | |
703 | hp->msg_status = 0; | |
704 | hp->info = 0; | |
705 | hp->host_status = 0; | |
706 | hp->driver_status = 0; | |
707 | hp->resid = 0; | |
708 | SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
709 | (int) cmnd[0], (int) hp->cmd_len)); | |
710 | ||
711 | if ((k = sg_start_req(srp))) { | |
712 | SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); | |
713 | sg_finish_rem_req(srp); | |
714 | return k; /* probably out of space --> ENOMEM */ | |
715 | } | |
716 | if ((k = sg_write_xfer(srp))) { | |
717 | SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); | |
718 | sg_finish_rem_req(srp); | |
719 | return k; | |
720 | } | |
721 | if (sdp->detached) { | |
722 | sg_finish_rem_req(srp); | |
723 | return -ENODEV; | |
724 | } | |
1da177e4 | 725 | |
1da177e4 LT |
726 | switch (hp->dxfer_direction) { |
727 | case SG_DXFER_TO_FROM_DEV: | |
728 | case SG_DXFER_FROM_DEV: | |
d6b10348 | 729 | data_dir = DMA_FROM_DEVICE; |
1da177e4 LT |
730 | break; |
731 | case SG_DXFER_TO_DEV: | |
d6b10348 | 732 | data_dir = DMA_TO_DEVICE; |
1da177e4 LT |
733 | break; |
734 | case SG_DXFER_UNKNOWN: | |
d6b10348 | 735 | data_dir = DMA_BIDIRECTIONAL; |
1da177e4 LT |
736 | break; |
737 | default: | |
d6b10348 | 738 | data_dir = DMA_NONE; |
1da177e4 LT |
739 | break; |
740 | } | |
cb59e840 | 741 | hp->duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
742 | /* Now send everything of to mid-level. The next time we hear about this |
743 | packet is when sg_cmd_done() is called (i.e. a callback). */ | |
bb1d1073 | 744 | if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, |
d6b10348 MC |
745 | hp->dxfer_len, srp->data.k_use_sg, timeout, |
746 | SG_DEFAULT_RETRIES, srp, sg_cmd_done, | |
747 | GFP_ATOMIC)) { | |
748 | SCSI_LOG_TIMEOUT(1, printk("sg_write: scsi_execute_async failed\n")); | |
749 | /* | |
750 | * most likely out of mem, but could also be a bad map | |
751 | */ | |
752 | return -ENOMEM; | |
753 | } else | |
754 | return 0; | |
1da177e4 LT |
755 | } |
756 | ||
757 | static int | |
758 | sg_srp_done(Sg_request *srp, Sg_fd *sfp) | |
759 | { | |
760 | unsigned long iflags; | |
761 | int done; | |
762 | ||
763 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
764 | done = srp->done; | |
765 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
766 | return done; | |
767 | } | |
768 | ||
769 | static int | |
770 | sg_ioctl(struct inode *inode, struct file *filp, | |
771 | unsigned int cmd_in, unsigned long arg) | |
772 | { | |
773 | void __user *p = (void __user *)arg; | |
774 | int __user *ip = p; | |
775 | int result, val, read_only; | |
776 | Sg_device *sdp; | |
777 | Sg_fd *sfp; | |
778 | Sg_request *srp; | |
779 | unsigned long iflags; | |
780 | ||
781 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
782 | return -ENXIO; | |
783 | SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", | |
784 | sdp->disk->disk_name, (int) cmd_in)); | |
785 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
786 | ||
787 | switch (cmd_in) { | |
788 | case SG_IO: | |
789 | { | |
790 | int blocking = 1; /* ignore O_NONBLOCK flag */ | |
791 | ||
792 | if (sdp->detached) | |
793 | return -ENODEV; | |
794 | if (!scsi_block_when_processing_errors(sdp->device)) | |
795 | return -ENXIO; | |
796 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
797 | return -EFAULT; | |
798 | result = | |
799 | sg_new_write(sfp, p, SZ_SG_IO_HDR, | |
800 | blocking, read_only, &srp); | |
801 | if (result < 0) | |
802 | return result; | |
803 | srp->sg_io_owned = 1; | |
804 | while (1) { | |
805 | result = 0; /* following macro to beat race condition */ | |
806 | __wait_event_interruptible(sfp->read_wait, | |
807 | (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), | |
808 | result); | |
809 | if (sdp->detached) | |
810 | return -ENODEV; | |
811 | if (sfp->closed) | |
812 | return 0; /* request packet dropped already */ | |
813 | if (0 == result) | |
814 | break; | |
815 | srp->orphan = 1; | |
816 | return result; /* -ERESTARTSYS because signal hit process */ | |
817 | } | |
818 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
819 | srp->done = 2; | |
820 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
821 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); | |
822 | return (result < 0) ? result : 0; | |
823 | } | |
824 | case SG_SET_TIMEOUT: | |
825 | result = get_user(val, ip); | |
826 | if (result) | |
827 | return result; | |
828 | if (val < 0) | |
829 | return -EIO; | |
830 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
831 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
832 | sfp->timeout_user = val; | |
833 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
834 | ||
835 | return 0; | |
836 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
837 | /* strange ..., for backward compatibility */ | |
838 | return sfp->timeout_user; | |
839 | case SG_SET_FORCE_LOW_DMA: | |
840 | result = get_user(val, ip); | |
841 | if (result) | |
842 | return result; | |
843 | if (val) { | |
844 | sfp->low_dma = 1; | |
845 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
846 | val = (int) sfp->reserve.bufflen; | |
847 | sg_remove_scat(&sfp->reserve); | |
848 | sg_build_reserve(sfp, val); | |
849 | } | |
850 | } else { | |
851 | if (sdp->detached) | |
852 | return -ENODEV; | |
853 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
854 | } | |
855 | return 0; | |
856 | case SG_GET_LOW_DMA: | |
857 | return put_user((int) sfp->low_dma, ip); | |
858 | case SG_GET_SCSI_ID: | |
859 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
860 | return -EFAULT; | |
861 | else { | |
862 | sg_scsi_id_t __user *sg_idp = p; | |
863 | ||
864 | if (sdp->detached) | |
865 | return -ENODEV; | |
866 | __put_user((int) sdp->device->host->host_no, | |
867 | &sg_idp->host_no); | |
868 | __put_user((int) sdp->device->channel, | |
869 | &sg_idp->channel); | |
870 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
871 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
872 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
873 | __put_user((short) sdp->device->host->cmd_per_lun, | |
874 | &sg_idp->h_cmd_per_lun); | |
875 | __put_user((short) sdp->device->queue_depth, | |
876 | &sg_idp->d_queue_depth); | |
877 | __put_user(0, &sg_idp->unused[0]); | |
878 | __put_user(0, &sg_idp->unused[1]); | |
879 | return 0; | |
880 | } | |
881 | case SG_SET_FORCE_PACK_ID: | |
882 | result = get_user(val, ip); | |
883 | if (result) | |
884 | return result; | |
885 | sfp->force_packid = val ? 1 : 0; | |
886 | return 0; | |
887 | case SG_GET_PACK_ID: | |
888 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
889 | return -EFAULT; | |
890 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
891 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
892 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
893 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
894 | iflags); | |
895 | __put_user(srp->header.pack_id, ip); | |
896 | return 0; | |
897 | } | |
898 | } | |
899 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
900 | __put_user(-1, ip); | |
901 | return 0; | |
902 | case SG_GET_NUM_WAITING: | |
903 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
904 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
905 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
906 | ++val; | |
907 | } | |
908 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
909 | return put_user(val, ip); | |
910 | case SG_GET_SG_TABLESIZE: | |
911 | return put_user(sdp->sg_tablesize, ip); | |
912 | case SG_SET_RESERVED_SIZE: | |
913 | result = get_user(val, ip); | |
914 | if (result) | |
915 | return result; | |
916 | if (val < 0) | |
917 | return -EINVAL; | |
918 | if (val != sfp->reserve.bufflen) { | |
919 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
920 | return -EBUSY; | |
921 | sg_remove_scat(&sfp->reserve); | |
922 | sg_build_reserve(sfp, val); | |
923 | } | |
924 | return 0; | |
925 | case SG_GET_RESERVED_SIZE: | |
926 | val = (int) sfp->reserve.bufflen; | |
927 | return put_user(val, ip); | |
928 | case SG_SET_COMMAND_Q: | |
929 | result = get_user(val, ip); | |
930 | if (result) | |
931 | return result; | |
932 | sfp->cmd_q = val ? 1 : 0; | |
933 | return 0; | |
934 | case SG_GET_COMMAND_Q: | |
935 | return put_user((int) sfp->cmd_q, ip); | |
936 | case SG_SET_KEEP_ORPHAN: | |
937 | result = get_user(val, ip); | |
938 | if (result) | |
939 | return result; | |
940 | sfp->keep_orphan = val; | |
941 | return 0; | |
942 | case SG_GET_KEEP_ORPHAN: | |
943 | return put_user((int) sfp->keep_orphan, ip); | |
944 | case SG_NEXT_CMD_LEN: | |
945 | result = get_user(val, ip); | |
946 | if (result) | |
947 | return result; | |
948 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
949 | return 0; | |
950 | case SG_GET_VERSION_NUM: | |
951 | return put_user(sg_version_num, ip); | |
952 | case SG_GET_ACCESS_COUNT: | |
953 | /* faked - we don't have a real access count anymore */ | |
954 | val = (sdp->device ? 1 : 0); | |
955 | return put_user(val, ip); | |
956 | case SG_GET_REQUEST_TABLE: | |
957 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
958 | return -EFAULT; | |
959 | else { | |
cb59e840 DG |
960 | sg_req_info_t *rinfo; |
961 | unsigned int ms; | |
962 | ||
963 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
964 | GFP_KERNEL); | |
965 | if (!rinfo) | |
966 | return -ENOMEM; | |
1da177e4 LT |
967 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
968 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
969 | ++val, srp = srp ? srp->nextrp : srp) { | |
970 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
971 | if (srp) { | |
972 | rinfo[val].req_state = srp->done + 1; | |
973 | rinfo[val].problem = | |
974 | srp->header.masked_status & | |
975 | srp->header.host_status & | |
976 | srp->header.driver_status; | |
cb59e840 DG |
977 | if (srp->done) |
978 | rinfo[val].duration = | |
979 | srp->header.duration; | |
980 | else { | |
981 | ms = jiffies_to_msecs(jiffies); | |
982 | rinfo[val].duration = | |
983 | (ms > srp->header.duration) ? | |
984 | (ms - srp->header.duration) : 0; | |
985 | } | |
1da177e4 | 986 | rinfo[val].orphan = srp->orphan; |
cb59e840 DG |
987 | rinfo[val].sg_io_owned = |
988 | srp->sg_io_owned; | |
989 | rinfo[val].pack_id = | |
990 | srp->header.pack_id; | |
991 | rinfo[val].usr_ptr = | |
992 | srp->header.usr_ptr; | |
1da177e4 LT |
993 | } |
994 | } | |
995 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 DG |
996 | result = __copy_to_user(p, rinfo, |
997 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
998 | result = result ? -EFAULT : 0; | |
999 | kfree(rinfo); | |
1000 | return result; | |
1da177e4 LT |
1001 | } |
1002 | case SG_EMULATED_HOST: | |
1003 | if (sdp->detached) | |
1004 | return -ENODEV; | |
1005 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1006 | case SG_SCSI_RESET: | |
1007 | if (sdp->detached) | |
1008 | return -ENODEV; | |
1009 | if (filp->f_flags & O_NONBLOCK) { | |
939647ee | 1010 | if (scsi_host_in_recovery(sdp->device->host)) |
1da177e4 LT |
1011 | return -EBUSY; |
1012 | } else if (!scsi_block_when_processing_errors(sdp->device)) | |
1013 | return -EBUSY; | |
1014 | result = get_user(val, ip); | |
1015 | if (result) | |
1016 | return result; | |
1017 | if (SG_SCSI_RESET_NOTHING == val) | |
1018 | return 0; | |
1019 | switch (val) { | |
1020 | case SG_SCSI_RESET_DEVICE: | |
1021 | val = SCSI_TRY_RESET_DEVICE; | |
1022 | break; | |
1023 | case SG_SCSI_RESET_BUS: | |
1024 | val = SCSI_TRY_RESET_BUS; | |
1025 | break; | |
1026 | case SG_SCSI_RESET_HOST: | |
1027 | val = SCSI_TRY_RESET_HOST; | |
1028 | break; | |
1029 | default: | |
1030 | return -EINVAL; | |
1031 | } | |
1032 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1033 | return -EACCES; | |
1034 | return (scsi_reset_provider(sdp->device, val) == | |
1035 | SUCCESS) ? 0 : -EIO; | |
1036 | case SCSI_IOCTL_SEND_COMMAND: | |
1037 | if (sdp->detached) | |
1038 | return -ENODEV; | |
1039 | if (read_only) { | |
1040 | unsigned char opcode = WRITE_6; | |
1041 | Scsi_Ioctl_Command __user *siocp = p; | |
1042 | ||
1043 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1044 | return -EFAULT; | |
1045 | if (!sg_allow_access(opcode, sdp->device->type)) | |
1046 | return -EPERM; | |
1047 | } | |
1048 | return scsi_ioctl_send_command(sdp->device, p); | |
1049 | case SG_SET_DEBUG: | |
1050 | result = get_user(val, ip); | |
1051 | if (result) | |
1052 | return result; | |
1053 | sdp->sgdebug = (char) val; | |
1054 | return 0; | |
1055 | case SCSI_IOCTL_GET_IDLUN: | |
1056 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1057 | case SCSI_IOCTL_PROBE_HOST: | |
1058 | case SG_GET_TRANSFORM: | |
1059 | if (sdp->detached) | |
1060 | return -ENODEV; | |
1061 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1062 | default: | |
1063 | if (read_only) | |
1064 | return -EPERM; /* don't know so take safe approach */ | |
1065 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | #ifdef CONFIG_COMPAT | |
1070 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1071 | { | |
1072 | Sg_device *sdp; | |
1073 | Sg_fd *sfp; | |
1074 | struct scsi_device *sdev; | |
1075 | ||
1076 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1077 | return -ENXIO; | |
1078 | ||
1079 | sdev = sdp->device; | |
1080 | if (sdev->host->hostt->compat_ioctl) { | |
1081 | int ret; | |
1082 | ||
1083 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1084 | ||
1085 | return ret; | |
1086 | } | |
1087 | ||
1088 | return -ENOIOCTLCMD; | |
1089 | } | |
1090 | #endif | |
1091 | ||
1092 | static unsigned int | |
1093 | sg_poll(struct file *filp, poll_table * wait) | |
1094 | { | |
1095 | unsigned int res = 0; | |
1096 | Sg_device *sdp; | |
1097 | Sg_fd *sfp; | |
1098 | Sg_request *srp; | |
1099 | int count = 0; | |
1100 | unsigned long iflags; | |
1101 | ||
1102 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) | |
1103 | || sfp->closed) | |
1104 | return POLLERR; | |
1105 | poll_wait(filp, &sfp->read_wait, wait); | |
1106 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1107 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1108 | /* if any read waiting, flag it */ | |
1109 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1110 | res = POLLIN | POLLRDNORM; | |
1111 | ++count; | |
1112 | } | |
1113 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1114 | ||
1115 | if (sdp->detached) | |
1116 | res |= POLLHUP; | |
1117 | else if (!sfp->cmd_q) { | |
1118 | if (0 == count) | |
1119 | res |= POLLOUT | POLLWRNORM; | |
1120 | } else if (count < SG_MAX_QUEUE) | |
1121 | res |= POLLOUT | POLLWRNORM; | |
1122 | SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", | |
1123 | sdp->disk->disk_name, (int) res)); | |
1124 | return res; | |
1125 | } | |
1126 | ||
1127 | static int | |
1128 | sg_fasync(int fd, struct file *filp, int mode) | |
1129 | { | |
1130 | int retval; | |
1131 | Sg_device *sdp; | |
1132 | Sg_fd *sfp; | |
1133 | ||
1134 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1135 | return -ENXIO; | |
1136 | SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", | |
1137 | sdp->disk->disk_name, mode)); | |
1138 | ||
1139 | retval = fasync_helper(fd, filp, mode, &sfp->async_qp); | |
1140 | return (retval < 0) ? retval : 0; | |
1141 | } | |
1142 | ||
1da177e4 | 1143 | /* When startFinish==1 increments page counts for pages other than the |
d6b10348 | 1144 | first of scatter gather elements obtained from alloc_pages(). |
1da177e4 LT |
1145 | When startFinish==0 decrements ... */ |
1146 | static void | |
1147 | sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish) | |
1148 | { | |
d6b10348 | 1149 | struct scatterlist *sg = rsv_schp->buffer; |
1da177e4 LT |
1150 | struct page *page; |
1151 | int k, m; | |
1152 | ||
1153 | SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n", | |
1154 | startFinish, rsv_schp->k_use_sg)); | |
1155 | /* N.B. correction _not_ applied to base page of each allocation */ | |
d6b10348 MC |
1156 | for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { |
1157 | for (m = PAGE_SIZE; m < sg->length; m += PAGE_SIZE) { | |
1158 | page = sg->page; | |
1da177e4 LT |
1159 | if (startFinish) |
1160 | get_page(page); | |
1161 | else { | |
1162 | if (page_count(page) > 0) | |
1163 | __put_page(page); | |
1164 | } | |
1165 | } | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | static struct page * | |
1170 | sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) | |
1171 | { | |
1172 | Sg_fd *sfp; | |
1173 | struct page *page = NOPAGE_SIGBUS; | |
d6b10348 | 1174 | unsigned long offset, len, sa; |
1da177e4 | 1175 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1176 | struct scatterlist *sg; |
1177 | int k; | |
1da177e4 LT |
1178 | |
1179 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
1180 | return page; | |
1181 | rsv_schp = &sfp->reserve; | |
1182 | offset = addr - vma->vm_start; | |
1183 | if (offset >= rsv_schp->bufflen) | |
1184 | return page; | |
1185 | SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", | |
1186 | offset, rsv_schp->k_use_sg)); | |
d6b10348 MC |
1187 | sg = rsv_schp->buffer; |
1188 | sa = vma->vm_start; | |
1189 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
1190 | ++k, ++sg) { | |
1191 | len = vma->vm_end - sa; | |
1192 | len = (len < sg->length) ? len : sg->length; | |
1193 | if (offset < len) { | |
1194 | page = sg->page; | |
1195 | get_page(page); /* increment page count */ | |
1196 | break; | |
1da177e4 | 1197 | } |
d6b10348 MC |
1198 | sa += len; |
1199 | offset -= len; | |
1da177e4 | 1200 | } |
d6b10348 | 1201 | |
1da177e4 LT |
1202 | if (type) |
1203 | *type = VM_FAULT_MINOR; | |
1204 | return page; | |
1205 | } | |
1206 | ||
1207 | static struct vm_operations_struct sg_mmap_vm_ops = { | |
1208 | .nopage = sg_vma_nopage, | |
1209 | }; | |
1210 | ||
1211 | static int | |
1212 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1213 | { | |
1214 | Sg_fd *sfp; | |
d6b10348 | 1215 | unsigned long req_sz, len, sa; |
1da177e4 | 1216 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1217 | int k; |
1218 | struct scatterlist *sg; | |
1da177e4 LT |
1219 | |
1220 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1221 | return -ENXIO; | |
cb59e840 | 1222 | req_sz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
1223 | SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", |
1224 | (void *) vma->vm_start, (int) req_sz)); | |
1225 | if (vma->vm_pgoff) | |
1226 | return -EINVAL; /* want no offset */ | |
1227 | rsv_schp = &sfp->reserve; | |
1228 | if (req_sz > rsv_schp->bufflen) | |
1229 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1230 | ||
d6b10348 MC |
1231 | sa = vma->vm_start; |
1232 | sg = rsv_schp->buffer; | |
1233 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
1234 | ++k, ++sg) { | |
1235 | len = vma->vm_end - sa; | |
1236 | len = (len < sg->length) ? len : sg->length; | |
1237 | sa += len; | |
1da177e4 | 1238 | } |
d6b10348 | 1239 | |
1da177e4 LT |
1240 | if (0 == sfp->mmap_called) { |
1241 | sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */ | |
1242 | sfp->mmap_called = 1; | |
1243 | } | |
1c8e71d7 | 1244 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
1245 | vma->vm_private_data = sfp; |
1246 | vma->vm_ops = &sg_mmap_vm_ops; | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | /* This function is a "bottom half" handler that is called by the | |
1251 | * mid level when a command is completed (or has failed). */ | |
1252 | static void | |
d6b10348 | 1253 | sg_cmd_done(void *data, char *sense, int result, int resid) |
1da177e4 | 1254 | { |
d6b10348 | 1255 | Sg_request *srp = data; |
1da177e4 LT |
1256 | Sg_device *sdp = NULL; |
1257 | Sg_fd *sfp; | |
1da177e4 | 1258 | unsigned long iflags; |
cb59e840 | 1259 | unsigned int ms; |
1da177e4 | 1260 | |
1da177e4 LT |
1261 | if (NULL == srp) { |
1262 | printk(KERN_ERR "sg_cmd_done: NULL request\n"); | |
1da177e4 LT |
1263 | return; |
1264 | } | |
1265 | sfp = srp->parentfp; | |
1266 | if (sfp) | |
1267 | sdp = sfp->parentdp; | |
1268 | if ((NULL == sdp) || sdp->detached) { | |
1269 | printk(KERN_INFO "sg_cmd_done: device detached\n"); | |
1da177e4 LT |
1270 | return; |
1271 | } | |
1272 | ||
1da177e4 LT |
1273 | |
1274 | SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", | |
d6b10348 MC |
1275 | sdp->disk->disk_name, srp->header.pack_id, result)); |
1276 | srp->header.resid = resid; | |
cb59e840 DG |
1277 | ms = jiffies_to_msecs(jiffies); |
1278 | srp->header.duration = (ms > srp->header.duration) ? | |
1279 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1280 | if (0 != result) { |
1da177e4 LT |
1281 | struct scsi_sense_hdr sshdr; |
1282 | ||
d6b10348 MC |
1283 | memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); |
1284 | srp->header.status = 0xff & result; | |
1285 | srp->header.masked_status = status_byte(result); | |
1286 | srp->header.msg_status = msg_byte(result); | |
1287 | srp->header.host_status = host_byte(result); | |
1288 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1289 | if ((sdp->sgdebug > 0) && |
1290 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1291 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d6b10348 MC |
1292 | __scsi_print_sense("sg_cmd_done", sense, |
1293 | SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
1294 | |
1295 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1296 | if (driver_byte(result) != 0 |
1297 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1298 | && !scsi_sense_is_deferred(&sshdr) |
1299 | && sshdr.sense_key == UNIT_ATTENTION | |
1300 | && sdp->device->removable) { | |
1301 | /* Detected possible disc change. Set the bit - this */ | |
1302 | /* may be used if there are filesystems using this device */ | |
1303 | sdp->device->changed = 1; | |
1304 | } | |
1305 | } | |
1306 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1307 | ||
1da177e4 LT |
1308 | if (sfp->closed) { /* whoops this fd already released, cleanup */ |
1309 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); | |
1310 | sg_finish_rem_req(srp); | |
1311 | srp = NULL; | |
1312 | if (NULL == sfp->headrp) { | |
1313 | SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); | |
1314 | if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ | |
1315 | scsi_device_put(sdp->device); | |
1316 | } | |
1317 | sfp = NULL; | |
1318 | } | |
1319 | } else if (srp && srp->orphan) { | |
1320 | if (sfp->keep_orphan) | |
1321 | srp->sg_io_owned = 0; | |
1322 | else { | |
1323 | sg_finish_rem_req(srp); | |
1324 | srp = NULL; | |
1325 | } | |
1326 | } | |
1327 | if (sfp && srp) { | |
1328 | /* Now wake up any sg_read() that is waiting for this packet. */ | |
1329 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); | |
1330 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1331 | srp->done = 1; | |
1332 | wake_up_interruptible(&sfp->read_wait); | |
1333 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1334 | } | |
1335 | } | |
1336 | ||
1337 | static struct file_operations sg_fops = { | |
1338 | .owner = THIS_MODULE, | |
1339 | .read = sg_read, | |
1340 | .write = sg_write, | |
1341 | .poll = sg_poll, | |
1342 | .ioctl = sg_ioctl, | |
1343 | #ifdef CONFIG_COMPAT | |
1344 | .compat_ioctl = sg_compat_ioctl, | |
1345 | #endif | |
1346 | .open = sg_open, | |
1347 | .mmap = sg_mmap, | |
1348 | .release = sg_release, | |
1349 | .fasync = sg_fasync, | |
1350 | }; | |
1351 | ||
d253878b | 1352 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1353 | |
1354 | static int sg_sysfs_valid = 0; | |
1355 | ||
1356 | static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) | |
1357 | { | |
d6b10348 | 1358 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1359 | Sg_device *sdp; |
1360 | unsigned long iflags; | |
1361 | void *old_sg_dev_arr = NULL; | |
1362 | int k, error; | |
1363 | ||
1364 | sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL); | |
1365 | if (!sdp) { | |
1366 | printk(KERN_WARNING "kmalloc Sg_device failure\n"); | |
1367 | return -ENOMEM; | |
1368 | } | |
1369 | ||
1370 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1371 | if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ | |
1372 | Sg_device **tmp_da; | |
1373 | int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; | |
1374 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1375 | ||
1376 | tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); | |
1377 | if (unlikely(!tmp_da)) | |
1378 | goto expand_failed; | |
1379 | ||
1380 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1381 | memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *)); | |
1382 | memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); | |
1383 | old_sg_dev_arr = sg_dev_arr; | |
1384 | sg_dev_arr = tmp_da; | |
1385 | sg_dev_max = tmp_dev_max; | |
1386 | } | |
1387 | ||
1388 | for (k = 0; k < sg_dev_max; k++) | |
1389 | if (!sg_dev_arr[k]) | |
1390 | break; | |
1391 | if (unlikely(k >= SG_MAX_DEVS)) | |
1392 | goto overflow; | |
1393 | ||
1394 | memset(sdp, 0, sizeof(*sdp)); | |
1395 | SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); | |
1396 | sprintf(disk->disk_name, "sg%d", k); | |
1397 | disk->first_minor = k; | |
1398 | sdp->disk = disk; | |
1399 | sdp->device = scsidp; | |
1400 | init_waitqueue_head(&sdp->o_excl_wait); | |
d6b10348 | 1401 | sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); |
1da177e4 LT |
1402 | |
1403 | sg_nr_dev++; | |
1404 | sg_dev_arr[k] = sdp; | |
1405 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1406 | error = k; | |
1407 | ||
1408 | out: | |
1409 | if (error < 0) | |
1410 | kfree(sdp); | |
1411 | kfree(old_sg_dev_arr); | |
1412 | return error; | |
1413 | ||
1414 | expand_failed: | |
1415 | printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); | |
1416 | error = -ENOMEM; | |
1417 | goto out; | |
1418 | ||
1419 | overflow: | |
1420 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
9ccfc756 JB |
1421 | sdev_printk(KERN_WARNING, scsidp, |
1422 | "Unable to attach sg device type=%d, minor " | |
1423 | "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); | |
1da177e4 LT |
1424 | error = -ENODEV; |
1425 | goto out; | |
1426 | } | |
1427 | ||
1428 | static int | |
d8539d81 | 1429 | sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1430 | { |
1431 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
1432 | struct gendisk *disk; | |
1433 | Sg_device *sdp = NULL; | |
1434 | struct cdev * cdev = NULL; | |
1435 | int error, k; | |
1436 | ||
1437 | disk = alloc_disk(1); | |
1438 | if (!disk) { | |
1439 | printk(KERN_WARNING "alloc_disk failed\n"); | |
1440 | return -ENOMEM; | |
1441 | } | |
1442 | disk->major = SCSI_GENERIC_MAJOR; | |
1443 | ||
1444 | error = -ENOMEM; | |
1445 | cdev = cdev_alloc(); | |
1446 | if (!cdev) { | |
1447 | printk(KERN_WARNING "cdev_alloc failed\n"); | |
1448 | goto out; | |
1449 | } | |
1450 | cdev->owner = THIS_MODULE; | |
1451 | cdev->ops = &sg_fops; | |
1452 | ||
1453 | error = sg_alloc(disk, scsidp); | |
1454 | if (error < 0) { | |
1455 | printk(KERN_WARNING "sg_alloc failed\n"); | |
1456 | goto out; | |
1457 | } | |
1458 | k = error; | |
1459 | sdp = sg_dev_arr[k]; | |
1460 | ||
1461 | devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k), | |
1462 | S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, | |
1463 | "%s/generic", scsidp->devfs_name); | |
1464 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); | |
1465 | if (error) { | |
1466 | devfs_remove("%s/generic", scsidp->devfs_name); | |
1467 | goto out; | |
1468 | } | |
1469 | sdp->cdev = cdev; | |
1470 | if (sg_sysfs_valid) { | |
1471 | struct class_device * sg_class_member; | |
1472 | ||
53f46542 | 1473 | sg_class_member = class_device_create(sg_sysfs_class, NULL, |
1da177e4 LT |
1474 | MKDEV(SCSI_GENERIC_MAJOR, k), |
1475 | cl_dev->dev, "%s", | |
1476 | disk->disk_name); | |
1477 | if (IS_ERR(sg_class_member)) | |
1478 | printk(KERN_WARNING "sg_add: " | |
d253878b | 1479 | "class_device_create failed\n"); |
1da177e4 LT |
1480 | class_set_devdata(sg_class_member, sdp); |
1481 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, | |
1482 | &sg_class_member->kobj, "generic"); | |
1483 | if (error) | |
1484 | printk(KERN_ERR "sg_add: unable to make symlink " | |
1485 | "'generic' back to sg%d\n", k); | |
1486 | } else | |
1487 | printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); | |
1488 | ||
9ccfc756 JB |
1489 | sdev_printk(KERN_NOTICE, scsidp, |
1490 | "Attached scsi generic sg%d type %d\n", k,scsidp->type); | |
1da177e4 LT |
1491 | |
1492 | return 0; | |
1493 | ||
1494 | out: | |
1495 | put_disk(disk); | |
1496 | if (cdev) | |
1497 | cdev_del(cdev); | |
1498 | return error; | |
1499 | } | |
1500 | ||
1501 | static void | |
d8539d81 | 1502 | sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1503 | { |
1504 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
1505 | Sg_device *sdp = NULL; | |
1506 | unsigned long iflags; | |
1507 | Sg_fd *sfp; | |
1508 | Sg_fd *tsfp; | |
1509 | Sg_request *srp; | |
1510 | Sg_request *tsrp; | |
1511 | int k, delay; | |
1512 | ||
1513 | if (NULL == sg_dev_arr) | |
1514 | return; | |
1515 | delay = 0; | |
1516 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1517 | for (k = 0; k < sg_dev_max; k++) { | |
1518 | sdp = sg_dev_arr[k]; | |
1519 | if ((NULL == sdp) || (sdp->device != scsidp)) | |
1520 | continue; /* dirty but lowers nesting */ | |
1521 | if (sdp->headfp) { | |
1522 | sdp->detached = 1; | |
1523 | for (sfp = sdp->headfp; sfp; sfp = tsfp) { | |
1524 | tsfp = sfp->nextfp; | |
1525 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
1526 | tsrp = srp->nextrp; | |
1527 | if (sfp->closed || (0 == sg_srp_done(srp, sfp))) | |
1528 | sg_finish_rem_req(srp); | |
1529 | } | |
1530 | if (sfp->closed) { | |
1531 | scsi_device_put(sdp->device); | |
1532 | __sg_remove_sfp(sdp, sfp); | |
1533 | } else { | |
1534 | delay = 1; | |
1535 | wake_up_interruptible(&sfp->read_wait); | |
1536 | kill_fasync(&sfp->async_qp, SIGPOLL, | |
1537 | POLL_HUP); | |
1538 | } | |
1539 | } | |
1540 | SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); | |
1541 | if (NULL == sdp->headfp) { | |
1542 | sg_dev_arr[k] = NULL; | |
1543 | } | |
1544 | } else { /* nothing active, simple case */ | |
1545 | SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); | |
1546 | sg_dev_arr[k] = NULL; | |
1547 | } | |
1548 | sg_nr_dev--; | |
1549 | break; | |
1550 | } | |
1551 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1552 | ||
1553 | if (sdp) { | |
1554 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
d253878b | 1555 | class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); |
1da177e4 LT |
1556 | cdev_del(sdp->cdev); |
1557 | sdp->cdev = NULL; | |
1558 | devfs_remove("%s/generic", scsidp->devfs_name); | |
1559 | put_disk(sdp->disk); | |
1560 | sdp->disk = NULL; | |
1561 | if (NULL == sdp->headfp) | |
1562 | kfree((char *) sdp); | |
1563 | } | |
1564 | ||
1565 | if (delay) | |
1566 | msleep(10); /* dirty detach so delay device destruction */ | |
1567 | } | |
1568 | ||
1569 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
1570 | * of sysfs parameters (which module_param doesn't yet support). | |
1571 | * Sysfs parameters defined explicitly below. | |
1572 | */ | |
1573 | module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); | |
1574 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); | |
1575 | ||
1576 | MODULE_AUTHOR("Douglas Gilbert"); | |
1577 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1578 | MODULE_LICENSE("GPL"); | |
1579 | MODULE_VERSION(SG_VERSION_STR); | |
1580 | ||
1581 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); | |
1582 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1583 | ||
1584 | static int __init | |
1585 | init_sg(void) | |
1586 | { | |
1587 | int rc; | |
1588 | ||
1589 | if (def_reserved_size >= 0) | |
1590 | sg_big_buff = def_reserved_size; | |
1591 | ||
1592 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1593 | SG_MAX_DEVS, "sg"); | |
1594 | if (rc) | |
1595 | return rc; | |
d253878b | 1596 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1597 | if ( IS_ERR(sg_sysfs_class) ) { |
1598 | rc = PTR_ERR(sg_sysfs_class); | |
1599 | goto err_out; | |
1600 | } | |
1601 | sg_sysfs_valid = 1; | |
1602 | rc = scsi_register_interface(&sg_interface); | |
1603 | if (0 == rc) { | |
1604 | #ifdef CONFIG_SCSI_PROC_FS | |
1605 | sg_proc_init(); | |
1606 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1607 | return 0; | |
1608 | } | |
d253878b | 1609 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1610 | err_out: |
1611 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1612 | return rc; | |
1613 | } | |
1614 | ||
1615 | static void __exit | |
1616 | exit_sg(void) | |
1617 | { | |
1618 | #ifdef CONFIG_SCSI_PROC_FS | |
1619 | sg_proc_cleanup(); | |
1620 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1621 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1622 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1623 | sg_sysfs_valid = 0; |
1624 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1625 | SG_MAX_DEVS); | |
c9475cb0 JJ |
1626 | kfree((char *)sg_dev_arr); |
1627 | sg_dev_arr = NULL; | |
1da177e4 LT |
1628 | sg_dev_max = 0; |
1629 | } | |
1630 | ||
1631 | static int | |
1632 | sg_start_req(Sg_request * srp) | |
1633 | { | |
1634 | int res; | |
1635 | Sg_fd *sfp = srp->parentfp; | |
1636 | sg_io_hdr_t *hp = &srp->header; | |
1637 | int dxfer_len = (int) hp->dxfer_len; | |
1638 | int dxfer_dir = hp->dxfer_direction; | |
1639 | Sg_scatter_hold *req_schp = &srp->data; | |
1640 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1641 | ||
1642 | SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); | |
1643 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) | |
1644 | return 0; | |
1645 | if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && | |
1646 | (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && | |
1647 | (!sfp->parentdp->device->host->unchecked_isa_dma)) { | |
1648 | res = sg_build_direct(srp, sfp, dxfer_len); | |
1649 | if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ | |
1650 | return res; | |
1651 | } | |
1652 | if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) | |
1653 | sg_link_reserve(sfp, srp, dxfer_len); | |
1654 | else { | |
1655 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1656 | if (res) { | |
1657 | sg_remove_scat(req_schp); | |
1658 | return res; | |
1659 | } | |
1660 | } | |
1661 | return 0; | |
1662 | } | |
1663 | ||
1664 | static void | |
1665 | sg_finish_rem_req(Sg_request * srp) | |
1666 | { | |
1667 | Sg_fd *sfp = srp->parentfp; | |
1668 | Sg_scatter_hold *req_schp = &srp->data; | |
1669 | ||
1670 | SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); | |
1671 | if (srp->res_used) | |
1672 | sg_unlink_reserve(sfp, srp); | |
1673 | else | |
1674 | sg_remove_scat(req_schp); | |
1675 | sg_remove_request(sfp, srp); | |
1676 | } | |
1677 | ||
1678 | static int | |
1679 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1680 | { | |
d6b10348 MC |
1681 | int sg_bufflen = tablesize * sizeof(struct scatterlist); |
1682 | unsigned int gfp_flags = GFP_ATOMIC | __GFP_NOWARN; | |
1da177e4 | 1683 | |
d6b10348 MC |
1684 | /* |
1685 | * TODO: test without low_dma, we should not need it since | |
1686 | * the block layer will bounce the buffer for us | |
1687 | * | |
1688 | * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. | |
1689 | */ | |
1690 | if (sfp->low_dma) | |
1691 | gfp_flags |= GFP_DMA; | |
1692 | schp->buffer = kzalloc(sg_bufflen, gfp_flags); | |
1da177e4 LT |
1693 | if (!schp->buffer) |
1694 | return -ENOMEM; | |
1da177e4 | 1695 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1696 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1697 | } |
1698 | ||
1699 | #ifdef SG_ALLOW_DIO_CODE | |
1700 | /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ | |
d6b10348 | 1701 | /* TODO: hopefully we can use the generic block layer code */ |
1da177e4 LT |
1702 | |
1703 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
1704 | - mapping of all pages not successful | |
1da177e4 LT |
1705 | (i.e., either completely successful or fails) |
1706 | */ | |
1707 | static int | |
1708 | st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
d6b10348 | 1709 | unsigned long uaddr, size_t count, int rw) |
1da177e4 | 1710 | { |
deb92b7e DG |
1711 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1712 | unsigned long start = uaddr >> PAGE_SHIFT; | |
1713 | const int nr_pages = end - start; | |
1da177e4 | 1714 | int res, i, j; |
1da177e4 LT |
1715 | struct page **pages; |
1716 | ||
1da177e4 LT |
1717 | /* User attempted Overflow! */ |
1718 | if ((uaddr + count) < uaddr) | |
1719 | return -EINVAL; | |
1720 | ||
1721 | /* Too big */ | |
1722 | if (nr_pages > max_pages) | |
1723 | return -ENOMEM; | |
1724 | ||
1725 | /* Hmm? */ | |
1726 | if (count == 0) | |
1727 | return 0; | |
1728 | ||
1729 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) | |
1730 | return -ENOMEM; | |
1731 | ||
1732 | /* Try to fault in all of the necessary pages */ | |
1733 | down_read(¤t->mm->mmap_sem); | |
1734 | /* rw==READ means read from drive, write into memory area */ | |
1735 | res = get_user_pages( | |
1736 | current, | |
1737 | current->mm, | |
1738 | uaddr, | |
1739 | nr_pages, | |
1740 | rw == READ, | |
1741 | 0, /* don't force */ | |
1742 | pages, | |
1743 | NULL); | |
1744 | up_read(¤t->mm->mmap_sem); | |
1745 | ||
1746 | /* Errors and no page mapped should return here */ | |
1747 | if (res < nr_pages) | |
1748 | goto out_unmap; | |
1749 | ||
1750 | for (i=0; i < nr_pages; i++) { | |
1751 | /* FIXME: flush superflous for rw==READ, | |
1752 | * probably wrong function for rw==WRITE | |
1753 | */ | |
1754 | flush_dcache_page(pages[i]); | |
1da177e4 LT |
1755 | /* ?? Is locking needed? I don't think so */ |
1756 | /* if (TestSetPageLocked(pages[i])) | |
1757 | goto out_unlock; */ | |
1758 | } | |
1759 | ||
d6b10348 | 1760 | sgl[0].page = pages[0]; |
1da177e4 LT |
1761 | sgl[0].offset = uaddr & ~PAGE_MASK; |
1762 | if (nr_pages > 1) { | |
1763 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
1764 | count -= sgl[0].length; | |
1765 | for (i=1; i < nr_pages ; i++) { | |
1da177e4 LT |
1766 | sgl[i].page = pages[i]; |
1767 | sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; | |
1768 | count -= PAGE_SIZE; | |
1769 | } | |
1770 | } | |
1771 | else { | |
1772 | sgl[0].length = count; | |
1773 | } | |
1774 | ||
1775 | kfree(pages); | |
1776 | return nr_pages; | |
1777 | ||
1da177e4 | 1778 | out_unmap: |
4d5cda06 | 1779 | if (res > 0) { |
1da177e4 LT |
1780 | for (j=0; j < res; j++) |
1781 | page_cache_release(pages[j]); | |
4d5cda06 HD |
1782 | res = 0; |
1783 | } | |
1da177e4 LT |
1784 | kfree(pages); |
1785 | return res; | |
1786 | } | |
1787 | ||
1788 | ||
1789 | /* And unmap them... */ | |
1790 | static int | |
1791 | st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
1792 | int dirtied) | |
1793 | { | |
1794 | int i; | |
1795 | ||
1796 | for (i=0; i < nr_pages; i++) { | |
b5810039 NP |
1797 | struct page *page = sgl[i].page; |
1798 | ||
b5810039 NP |
1799 | if (dirtied) |
1800 | SetPageDirty(page); | |
1801 | /* unlock_page(page); */ | |
1da177e4 LT |
1802 | /* FIXME: cache flush missing for rw==READ |
1803 | * FIXME: call the correct reference counting function | |
1804 | */ | |
b5810039 | 1805 | page_cache_release(page); |
1da177e4 LT |
1806 | } |
1807 | ||
1808 | return 0; | |
1809 | } | |
1810 | ||
1811 | /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ | |
1812 | #endif | |
1813 | ||
1814 | ||
1815 | /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ | |
1816 | static int | |
1817 | sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) | |
1818 | { | |
1819 | #ifdef SG_ALLOW_DIO_CODE | |
1820 | sg_io_hdr_t *hp = &srp->header; | |
1821 | Sg_scatter_hold *schp = &srp->data; | |
1822 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 LT |
1823 | int mx_sc_elems, res; |
1824 | struct scsi_device *sdev = sfp->parentdp->device; | |
1825 | ||
1826 | if (((unsigned long)hp->dxferp & | |
1827 | queue_dma_alignment(sdev->request_queue)) != 0) | |
1828 | return 1; | |
d6b10348 | 1829 | |
1da177e4 LT |
1830 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); |
1831 | if (mx_sc_elems <= 0) { | |
1832 | return 1; | |
1833 | } | |
d6b10348 MC |
1834 | res = st_map_user_pages(schp->buffer, mx_sc_elems, |
1835 | (unsigned long)hp->dxferp, dxfer_len, | |
1836 | (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); | |
1da177e4 LT |
1837 | if (res <= 0) |
1838 | return 1; | |
1839 | schp->k_use_sg = res; | |
1840 | schp->dio_in_use = 1; | |
1841 | hp->info |= SG_INFO_DIRECT_IO; | |
1842 | return 0; | |
1843 | #else | |
1844 | return 1; | |
1845 | #endif | |
1846 | } | |
1847 | ||
1848 | static int | |
1849 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1850 | { | |
d6b10348 MC |
1851 | struct scatterlist *sg; |
1852 | int ret_sz = 0, k, rem_sz, num, mx_sc_elems; | |
1853 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 | 1854 | int blk_size = buff_size; |
d6b10348 | 1855 | struct page *p = NULL; |
1da177e4 LT |
1856 | |
1857 | if ((blk_size < 0) || (!sfp)) | |
1858 | return -EFAULT; | |
1859 | if (0 == blk_size) | |
1860 | ++blk_size; /* don't know why */ | |
1861 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ | |
1862 | blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); | |
1863 | SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1864 | buff_size, blk_size)); | |
d6b10348 MC |
1865 | |
1866 | /* N.B. ret_sz carried into this block ... */ | |
1867 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1868 | if (mx_sc_elems < 0) | |
1869 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1870 | ||
1871 | for (k = 0, sg = schp->buffer, rem_sz = blk_size; | |
1872 | (rem_sz > 0) && (k < mx_sc_elems); | |
1873 | ++k, rem_sz -= ret_sz, ++sg) { | |
1874 | ||
1875 | num = (rem_sz > SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; | |
1876 | p = sg_page_malloc(num, sfp->low_dma, &ret_sz); | |
1da177e4 LT |
1877 | if (!p) |
1878 | return -ENOMEM; | |
d6b10348 MC |
1879 | |
1880 | sg->page = p; | |
1881 | sg->length = ret_sz; | |
1882 | ||
1883 | SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", | |
1884 | k, p, ret_sz)); | |
1885 | } /* end of for loop */ | |
1886 | ||
1887 | schp->k_use_sg = k; | |
1888 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); | |
1889 | ||
1890 | schp->bufflen = blk_size; | |
1891 | if (rem_sz > 0) /* must have failed */ | |
1892 | return -ENOMEM; | |
1893 | ||
1da177e4 LT |
1894 | return 0; |
1895 | } | |
1896 | ||
1897 | static int | |
1898 | sg_write_xfer(Sg_request * srp) | |
1899 | { | |
1900 | sg_io_hdr_t *hp = &srp->header; | |
1901 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 1902 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
1903 | int num_xfer = 0; |
1904 | int j, k, onum, usglen, ksglen, res; | |
1905 | int iovec_count = (int) hp->iovec_count; | |
1906 | int dxfer_dir = hp->dxfer_direction; | |
1907 | unsigned char *p; | |
1908 | unsigned char __user *up; | |
1909 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
1910 | ||
1911 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || | |
1912 | (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
1913 | num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); | |
1914 | if (schp->bufflen < num_xfer) | |
1915 | num_xfer = schp->bufflen; | |
1916 | } | |
1917 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
1918 | (new_interface | |
1919 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
1920 | return 0; | |
1921 | ||
1922 | SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
1923 | num_xfer, iovec_count, schp->k_use_sg)); | |
1924 | if (iovec_count) { | |
1925 | onum = iovec_count; | |
1926 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
1927 | return -EFAULT; | |
1928 | } else | |
1929 | onum = 1; | |
1930 | ||
d6b10348 MC |
1931 | ksglen = sg->length; |
1932 | p = page_address(sg->page); | |
1933 | for (j = 0, k = 0; j < onum; ++j) { | |
1934 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
1935 | if (res) | |
1936 | return res; | |
1937 | ||
1938 | for (; p; ++sg, ksglen = sg->length, | |
1939 | p = page_address(sg->page)) { | |
1940 | if (usglen <= 0) | |
1941 | break; | |
1942 | if (ksglen > usglen) { | |
1943 | if (usglen >= num_xfer) { | |
1944 | if (__copy_from_user(p, up, num_xfer)) | |
1da177e4 | 1945 | return -EFAULT; |
d6b10348 | 1946 | return 0; |
1da177e4 | 1947 | } |
d6b10348 MC |
1948 | if (__copy_from_user(p, up, usglen)) |
1949 | return -EFAULT; | |
1950 | p += usglen; | |
1951 | ksglen -= usglen; | |
1952 | break; | |
1953 | } else { | |
1954 | if (ksglen >= num_xfer) { | |
1955 | if (__copy_from_user(p, up, num_xfer)) | |
1956 | return -EFAULT; | |
1da177e4 | 1957 | return 0; |
d6b10348 MC |
1958 | } |
1959 | if (__copy_from_user(p, up, ksglen)) | |
1960 | return -EFAULT; | |
1961 | up += ksglen; | |
1962 | usglen -= ksglen; | |
1da177e4 | 1963 | } |
d6b10348 MC |
1964 | ++k; |
1965 | if (k >= schp->k_use_sg) | |
1966 | return 0; | |
1da177e4 LT |
1967 | } |
1968 | } | |
d6b10348 | 1969 | |
1da177e4 LT |
1970 | return 0; |
1971 | } | |
1972 | ||
1973 | static int | |
1974 | sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
1975 | int wr_xf, int *countp, unsigned char __user **up) | |
1976 | { | |
1977 | int num_xfer = (int) hp->dxfer_len; | |
1978 | unsigned char __user *p = hp->dxferp; | |
1979 | int count; | |
1980 | ||
1981 | if (0 == sg_num) { | |
1982 | if (wr_xf && ('\0' == hp->interface_id)) | |
1983 | count = (int) hp->flags; /* holds "old" input_size */ | |
1984 | else | |
1985 | count = num_xfer; | |
1986 | } else { | |
1987 | sg_iovec_t iovec; | |
1988 | if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) | |
1989 | return -EFAULT; | |
1990 | p = iovec.iov_base; | |
1991 | count = (int) iovec.iov_len; | |
1992 | } | |
1993 | if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) | |
1994 | return -EFAULT; | |
1995 | if (up) | |
1996 | *up = p; | |
1997 | if (countp) | |
1998 | *countp = count; | |
1999 | return 0; | |
2000 | } | |
2001 | ||
2002 | static void | |
2003 | sg_remove_scat(Sg_scatter_hold * schp) | |
2004 | { | |
2005 | SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
2006 | if (schp->buffer && (schp->sglist_len > 0)) { | |
d6b10348 | 2007 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2008 | |
2009 | if (schp->dio_in_use) { | |
2010 | #ifdef SG_ALLOW_DIO_CODE | |
d6b10348 | 2011 | st_unmap_user_pages(sg, schp->k_use_sg, TRUE); |
1da177e4 LT |
2012 | #endif |
2013 | } else { | |
2014 | int k; | |
2015 | ||
d6b10348 MC |
2016 | for (k = 0; (k < schp->k_use_sg) && sg->page; |
2017 | ++k, ++sg) { | |
1da177e4 LT |
2018 | SCSI_LOG_TIMEOUT(5, printk( |
2019 | "sg_remove_scat: k=%d, a=0x%p, len=%d\n", | |
d6b10348 MC |
2020 | k, sg->page, sg->length)); |
2021 | sg_page_free(sg->page, sg->length); | |
1da177e4 LT |
2022 | } |
2023 | } | |
d6b10348 MC |
2024 | kfree(schp->buffer); |
2025 | } | |
1da177e4 LT |
2026 | memset(schp, 0, sizeof (*schp)); |
2027 | } | |
2028 | ||
2029 | static int | |
2030 | sg_read_xfer(Sg_request * srp) | |
2031 | { | |
2032 | sg_io_hdr_t *hp = &srp->header; | |
2033 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 2034 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2035 | int num_xfer = 0; |
2036 | int j, k, onum, usglen, ksglen, res; | |
2037 | int iovec_count = (int) hp->iovec_count; | |
2038 | int dxfer_dir = hp->dxfer_direction; | |
2039 | unsigned char *p; | |
2040 | unsigned char __user *up; | |
2041 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2042 | ||
2043 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) | |
2044 | || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2045 | num_xfer = hp->dxfer_len; | |
2046 | if (schp->bufflen < num_xfer) | |
2047 | num_xfer = schp->bufflen; | |
2048 | } | |
2049 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2050 | (new_interface | |
2051 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2052 | return 0; | |
2053 | ||
2054 | SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2055 | num_xfer, iovec_count, schp->k_use_sg)); | |
2056 | if (iovec_count) { | |
2057 | onum = iovec_count; | |
2058 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2059 | return -EFAULT; | |
2060 | } else | |
2061 | onum = 1; | |
2062 | ||
d6b10348 MC |
2063 | p = page_address(sg->page); |
2064 | ksglen = sg->length; | |
2065 | for (j = 0, k = 0; j < onum; ++j) { | |
2066 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2067 | if (res) | |
2068 | return res; | |
2069 | ||
2070 | for (; p; ++sg, ksglen = sg->length, | |
2071 | p = page_address(sg->page)) { | |
2072 | if (usglen <= 0) | |
2073 | break; | |
2074 | if (ksglen > usglen) { | |
2075 | if (usglen >= num_xfer) { | |
2076 | if (__copy_to_user(up, p, num_xfer)) | |
1da177e4 | 2077 | return -EFAULT; |
d6b10348 | 2078 | return 0; |
1da177e4 | 2079 | } |
d6b10348 MC |
2080 | if (__copy_to_user(up, p, usglen)) |
2081 | return -EFAULT; | |
2082 | p += usglen; | |
2083 | ksglen -= usglen; | |
2084 | break; | |
2085 | } else { | |
2086 | if (ksglen >= num_xfer) { | |
2087 | if (__copy_to_user(up, p, num_xfer)) | |
2088 | return -EFAULT; | |
1da177e4 | 2089 | return 0; |
d6b10348 MC |
2090 | } |
2091 | if (__copy_to_user(up, p, ksglen)) | |
2092 | return -EFAULT; | |
2093 | up += ksglen; | |
2094 | usglen -= ksglen; | |
1da177e4 | 2095 | } |
d6b10348 MC |
2096 | ++k; |
2097 | if (k >= schp->k_use_sg) | |
2098 | return 0; | |
1da177e4 LT |
2099 | } |
2100 | } | |
d6b10348 | 2101 | |
1da177e4 LT |
2102 | return 0; |
2103 | } | |
2104 | ||
2105 | static int | |
2106 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
2107 | { | |
2108 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 MC |
2109 | struct scatterlist *sg = schp->buffer; |
2110 | int k, num; | |
1da177e4 LT |
2111 | |
2112 | SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", | |
2113 | num_read_xfer)); | |
2114 | if ((!outp) || (num_read_xfer <= 0)) | |
2115 | return 0; | |
d6b10348 MC |
2116 | |
2117 | for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) { | |
2118 | num = sg->length; | |
2119 | if (num > num_read_xfer) { | |
2120 | if (__copy_to_user(outp, page_address(sg->page), | |
2121 | num_read_xfer)) | |
2122 | return -EFAULT; | |
2123 | break; | |
2124 | } else { | |
2125 | if (__copy_to_user(outp, page_address(sg->page), | |
2126 | num)) | |
2127 | return -EFAULT; | |
2128 | num_read_xfer -= num; | |
2129 | if (num_read_xfer <= 0) | |
1da177e4 | 2130 | break; |
d6b10348 | 2131 | outp += num; |
1da177e4 | 2132 | } |
1da177e4 | 2133 | } |
d6b10348 | 2134 | |
1da177e4 LT |
2135 | return 0; |
2136 | } | |
2137 | ||
2138 | static void | |
2139 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2140 | { | |
2141 | Sg_scatter_hold *schp = &sfp->reserve; | |
2142 | ||
2143 | SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); | |
2144 | do { | |
2145 | if (req_size < PAGE_SIZE) | |
2146 | req_size = PAGE_SIZE; | |
2147 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2148 | return; | |
2149 | else | |
2150 | sg_remove_scat(schp); | |
2151 | req_size >>= 1; /* divide by 2 */ | |
2152 | } while (req_size > (PAGE_SIZE / 2)); | |
2153 | } | |
2154 | ||
2155 | static void | |
2156 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2157 | { | |
2158 | Sg_scatter_hold *req_schp = &srp->data; | |
2159 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 MC |
2160 | struct scatterlist *sg = rsv_schp->buffer; |
2161 | int k, num, rem; | |
1da177e4 LT |
2162 | |
2163 | srp->res_used = 1; | |
2164 | SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); | |
d6b10348 MC |
2165 | rem = size = (size + 1) & (~1); /* round to even for aha1542 */ |
2166 | ||
2167 | for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) { | |
2168 | num = sg->length; | |
2169 | if (rem <= num) { | |
2170 | sfp->save_scat_len = num; | |
2171 | sg->length = rem; | |
2172 | req_schp->k_use_sg = k + 1; | |
2173 | req_schp->sglist_len = rsv_schp->sglist_len; | |
2174 | req_schp->buffer = rsv_schp->buffer; | |
2175 | ||
2176 | req_schp->bufflen = size; | |
2177 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2178 | break; | |
2179 | } else | |
2180 | rem -= num; | |
1da177e4 | 2181 | } |
d6b10348 MC |
2182 | |
2183 | if (k >= rsv_schp->k_use_sg) | |
2184 | SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
2185 | } |
2186 | ||
2187 | static void | |
2188 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2189 | { | |
2190 | Sg_scatter_hold *req_schp = &srp->data; | |
2191 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2192 | ||
2193 | SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", | |
2194 | (int) req_schp->k_use_sg)); | |
2195 | if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { | |
d6b10348 | 2196 | struct scatterlist *sg = rsv_schp->buffer; |
1da177e4 LT |
2197 | |
2198 | if (sfp->save_scat_len > 0) | |
d6b10348 | 2199 | (sg + (req_schp->k_use_sg - 1))->length = |
1da177e4 LT |
2200 | (unsigned) sfp->save_scat_len; |
2201 | else | |
2202 | SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); | |
2203 | } | |
2204 | req_schp->k_use_sg = 0; | |
2205 | req_schp->bufflen = 0; | |
2206 | req_schp->buffer = NULL; | |
2207 | req_schp->sglist_len = 0; | |
2208 | sfp->save_scat_len = 0; | |
2209 | srp->res_used = 0; | |
2210 | } | |
2211 | ||
2212 | static Sg_request * | |
2213 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2214 | { | |
2215 | Sg_request *resp; | |
2216 | unsigned long iflags; | |
2217 | ||
2218 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2219 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2220 | /* look for requests that are ready + not SG_IO owned */ | |
2221 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2222 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2223 | resp->done = 2; /* guard against other readers */ | |
2224 | break; | |
2225 | } | |
2226 | } | |
2227 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2228 | return resp; | |
2229 | } | |
2230 | ||
2231 | #ifdef CONFIG_SCSI_PROC_FS | |
2232 | static Sg_request * | |
2233 | sg_get_nth_request(Sg_fd * sfp, int nth) | |
2234 | { | |
2235 | Sg_request *resp; | |
2236 | unsigned long iflags; | |
2237 | int k; | |
2238 | ||
2239 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2240 | for (k = 0, resp = sfp->headrp; resp && (k < nth); | |
2241 | ++k, resp = resp->nextrp) ; | |
2242 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2243 | return resp; | |
2244 | } | |
2245 | #endif | |
2246 | ||
2247 | /* always adds to end of list */ | |
2248 | static Sg_request * | |
2249 | sg_add_request(Sg_fd * sfp) | |
2250 | { | |
2251 | int k; | |
2252 | unsigned long iflags; | |
2253 | Sg_request *resp; | |
2254 | Sg_request *rp = sfp->req_arr; | |
2255 | ||
2256 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2257 | resp = sfp->headrp; | |
2258 | if (!resp) { | |
2259 | memset(rp, 0, sizeof (Sg_request)); | |
2260 | rp->parentfp = sfp; | |
2261 | resp = rp; | |
2262 | sfp->headrp = resp; | |
2263 | } else { | |
2264 | if (0 == sfp->cmd_q) | |
2265 | resp = NULL; /* command queuing disallowed */ | |
2266 | else { | |
2267 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2268 | if (!rp->parentfp) | |
2269 | break; | |
2270 | } | |
2271 | if (k < SG_MAX_QUEUE) { | |
2272 | memset(rp, 0, sizeof (Sg_request)); | |
2273 | rp->parentfp = sfp; | |
2274 | while (resp->nextrp) | |
2275 | resp = resp->nextrp; | |
2276 | resp->nextrp = rp; | |
2277 | resp = rp; | |
2278 | } else | |
2279 | resp = NULL; | |
2280 | } | |
2281 | } | |
2282 | if (resp) { | |
2283 | resp->nextrp = NULL; | |
cb59e840 | 2284 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
2285 | } |
2286 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2287 | return resp; | |
2288 | } | |
2289 | ||
2290 | /* Return of 1 for found; 0 for not found */ | |
2291 | static int | |
2292 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2293 | { | |
2294 | Sg_request *prev_rp; | |
2295 | Sg_request *rp; | |
2296 | unsigned long iflags; | |
2297 | int res = 0; | |
2298 | ||
2299 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2300 | return res; | |
2301 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2302 | prev_rp = sfp->headrp; | |
2303 | if (srp == prev_rp) { | |
2304 | sfp->headrp = prev_rp->nextrp; | |
2305 | prev_rp->parentfp = NULL; | |
2306 | res = 1; | |
2307 | } else { | |
2308 | while ((rp = prev_rp->nextrp)) { | |
2309 | if (srp == rp) { | |
2310 | prev_rp->nextrp = rp->nextrp; | |
2311 | rp->parentfp = NULL; | |
2312 | res = 1; | |
2313 | break; | |
2314 | } | |
2315 | prev_rp = rp; | |
2316 | } | |
2317 | } | |
2318 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2319 | return res; | |
2320 | } | |
2321 | ||
2322 | #ifdef CONFIG_SCSI_PROC_FS | |
2323 | static Sg_fd * | |
2324 | sg_get_nth_sfp(Sg_device * sdp, int nth) | |
2325 | { | |
2326 | Sg_fd *resp; | |
2327 | unsigned long iflags; | |
2328 | int k; | |
2329 | ||
2330 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2331 | for (k = 0, resp = sdp->headfp; resp && (k < nth); | |
2332 | ++k, resp = resp->nextfp) ; | |
2333 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2334 | return resp; | |
2335 | } | |
2336 | #endif | |
2337 | ||
2338 | static Sg_fd * | |
2339 | sg_add_sfp(Sg_device * sdp, int dev) | |
2340 | { | |
2341 | Sg_fd *sfp; | |
2342 | unsigned long iflags; | |
2343 | ||
d6b10348 | 2344 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 LT |
2345 | if (!sfp) |
2346 | return NULL; | |
d6b10348 | 2347 | |
1da177e4 LT |
2348 | init_waitqueue_head(&sfp->read_wait); |
2349 | rwlock_init(&sfp->rq_list_lock); | |
2350 | ||
2351 | sfp->timeout = SG_DEFAULT_TIMEOUT; | |
2352 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2353 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2354 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2355 | sdp->device->host->unchecked_isa_dma : 1; | |
2356 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2357 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2358 | sfp->parentdp = sdp; | |
2359 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2360 | if (!sdp->headfp) | |
2361 | sdp->headfp = sfp; | |
2362 | else { /* add to tail of existing list */ | |
2363 | Sg_fd *pfp = sdp->headfp; | |
2364 | while (pfp->nextfp) | |
2365 | pfp = pfp->nextfp; | |
2366 | pfp->nextfp = sfp; | |
2367 | } | |
2368 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2369 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); | |
2370 | sg_build_reserve(sfp, sg_big_buff); | |
2371 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", | |
2372 | sfp->reserve.bufflen, sfp->reserve.k_use_sg)); | |
2373 | return sfp; | |
2374 | } | |
2375 | ||
2376 | static void | |
2377 | __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2378 | { | |
2379 | Sg_fd *fp; | |
2380 | Sg_fd *prev_fp; | |
2381 | ||
2382 | prev_fp = sdp->headfp; | |
2383 | if (sfp == prev_fp) | |
2384 | sdp->headfp = prev_fp->nextfp; | |
2385 | else { | |
2386 | while ((fp = prev_fp->nextfp)) { | |
2387 | if (sfp == fp) { | |
2388 | prev_fp->nextfp = fp->nextfp; | |
2389 | break; | |
2390 | } | |
2391 | prev_fp = fp; | |
2392 | } | |
2393 | } | |
2394 | if (sfp->reserve.bufflen > 0) { | |
2395 | SCSI_LOG_TIMEOUT(6, | |
2396 | printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2397 | (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); | |
2398 | if (sfp->mmap_called) | |
2399 | sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */ | |
2400 | sg_remove_scat(&sfp->reserve); | |
2401 | } | |
2402 | sfp->parentdp = NULL; | |
2403 | SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); | |
d6b10348 | 2404 | kfree(sfp); |
1da177e4 LT |
2405 | } |
2406 | ||
2407 | /* Returns 0 in normal case, 1 when detached and sdp object removed */ | |
2408 | static int | |
2409 | sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2410 | { | |
2411 | Sg_request *srp; | |
2412 | Sg_request *tsrp; | |
2413 | int dirty = 0; | |
2414 | int res = 0; | |
2415 | ||
2416 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
2417 | tsrp = srp->nextrp; | |
2418 | if (sg_srp_done(srp, sfp)) | |
2419 | sg_finish_rem_req(srp); | |
2420 | else | |
2421 | ++dirty; | |
2422 | } | |
2423 | if (0 == dirty) { | |
2424 | unsigned long iflags; | |
2425 | ||
2426 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2427 | __sg_remove_sfp(sdp, sfp); | |
2428 | if (sdp->detached && (NULL == sdp->headfp)) { | |
2429 | int k, maxd; | |
2430 | ||
2431 | maxd = sg_dev_max; | |
2432 | for (k = 0; k < maxd; ++k) { | |
2433 | if (sdp == sg_dev_arr[k]) | |
2434 | break; | |
2435 | } | |
2436 | if (k < maxd) | |
2437 | sg_dev_arr[k] = NULL; | |
2438 | kfree((char *) sdp); | |
2439 | res = 1; | |
2440 | } | |
2441 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2442 | } else { | |
2443 | /* MOD_INC's to inhibit unloading sg and associated adapter driver */ | |
2444 | /* only bump the access_count if we actually succeeded in | |
2445 | * throwing another counter on the host module */ | |
2446 | scsi_device_get(sdp->device); /* XXX: retval ignored? */ | |
2447 | sfp->closed = 1; /* flag dirty state on this fd */ | |
2448 | SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", | |
2449 | dirty)); | |
2450 | } | |
2451 | return res; | |
2452 | } | |
2453 | ||
2454 | static int | |
2455 | sg_res_in_use(Sg_fd * sfp) | |
2456 | { | |
2457 | const Sg_request *srp; | |
2458 | unsigned long iflags; | |
2459 | ||
2460 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2461 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2462 | if (srp->res_used) | |
2463 | break; | |
2464 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2465 | return srp ? 1 : 0; | |
2466 | } | |
2467 | ||
2468 | /* If retSzp==NULL want exact size or fail */ | |
d6b10348 | 2469 | static struct page * |
1da177e4 LT |
2470 | sg_page_malloc(int rqSz, int lowDma, int *retSzp) |
2471 | { | |
d6b10348 | 2472 | struct page *resp = NULL; |
c53033f6 | 2473 | gfp_t page_mask; |
1da177e4 LT |
2474 | int order, a_size; |
2475 | int resSz = rqSz; | |
2476 | ||
2477 | if (rqSz <= 0) | |
2478 | return resp; | |
2479 | ||
2480 | if (lowDma) | |
2481 | page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN; | |
2482 | else | |
2483 | page_mask = GFP_ATOMIC | __GFP_NOWARN; | |
2484 | ||
2485 | for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; | |
2486 | order++, a_size <<= 1) ; | |
d6b10348 | 2487 | resp = alloc_pages(page_mask, order); |
1da177e4 LT |
2488 | while ((!resp) && order && retSzp) { |
2489 | --order; | |
2490 | a_size >>= 1; /* divide by 2, until PAGE_SIZE */ | |
d6b10348 | 2491 | resp = alloc_pages(page_mask, order); /* try half */ |
1da177e4 LT |
2492 | resSz = a_size; |
2493 | } | |
2494 | if (resp) { | |
2495 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
41ed16fa | 2496 | memset(page_address(resp), 0, resSz); |
1da177e4 LT |
2497 | if (retSzp) |
2498 | *retSzp = resSz; | |
2499 | } | |
2500 | return resp; | |
2501 | } | |
2502 | ||
2503 | static void | |
d6b10348 | 2504 | sg_page_free(struct page *page, int size) |
1da177e4 LT |
2505 | { |
2506 | int order, a_size; | |
2507 | ||
d6b10348 | 2508 | if (!page) |
1da177e4 LT |
2509 | return; |
2510 | for (order = 0, a_size = PAGE_SIZE; a_size < size; | |
2511 | order++, a_size <<= 1) ; | |
d6b10348 | 2512 | __free_pages(page, order); |
1da177e4 LT |
2513 | } |
2514 | ||
2515 | #ifndef MAINTENANCE_IN_CMD | |
2516 | #define MAINTENANCE_IN_CMD 0xa3 | |
2517 | #endif | |
2518 | ||
2519 | static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, | |
2520 | INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, | |
2521 | READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, | |
2522 | SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD | |
2523 | }; | |
2524 | ||
2525 | static int | |
2526 | sg_allow_access(unsigned char opcode, char dev_type) | |
2527 | { | |
2528 | int k; | |
2529 | ||
2530 | if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ | |
2531 | return 1; | |
2532 | for (k = 0; k < sizeof (allow_ops); ++k) { | |
2533 | if (opcode == allow_ops[k]) | |
2534 | return 1; | |
2535 | } | |
2536 | return 0; | |
2537 | } | |
2538 | ||
2539 | #ifdef CONFIG_SCSI_PROC_FS | |
2540 | static int | |
2541 | sg_last_dev(void) | |
2542 | { | |
2543 | int k; | |
2544 | unsigned long iflags; | |
2545 | ||
2546 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2547 | for (k = sg_dev_max - 1; k >= 0; --k) | |
2548 | if (sg_dev_arr[k] && sg_dev_arr[k]->device) | |
2549 | break; | |
2550 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2551 | return k + 1; /* origin 1 */ | |
2552 | } | |
2553 | #endif | |
2554 | ||
2555 | static Sg_device * | |
2556 | sg_get_dev(int dev) | |
2557 | { | |
2558 | Sg_device *sdp = NULL; | |
2559 | unsigned long iflags; | |
2560 | ||
2561 | if (sg_dev_arr && (dev >= 0)) { | |
2562 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2563 | if (dev < sg_dev_max) | |
2564 | sdp = sg_dev_arr[dev]; | |
2565 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2566 | } | |
2567 | return sdp; | |
2568 | } | |
2569 | ||
2570 | #ifdef CONFIG_SCSI_PROC_FS | |
2571 | ||
2572 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2573 | ||
2574 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2575 | ||
2576 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2577 | ||
2578 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2579 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2580 | size_t count, loff_t *off); | |
2581 | static struct file_operations adio_fops = { | |
2582 | /* .owner, .read and .llseek added in sg_proc_init() */ | |
2583 | .open = sg_proc_single_open_adio, | |
2584 | .write = sg_proc_write_adio, | |
2585 | .release = single_release, | |
2586 | }; | |
2587 | ||
2588 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2589 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2590 | const char __user *buffer, size_t count, loff_t *off); | |
2591 | static struct file_operations dressz_fops = { | |
2592 | .open = sg_proc_single_open_dressz, | |
2593 | .write = sg_proc_write_dressz, | |
2594 | .release = single_release, | |
2595 | }; | |
2596 | ||
2597 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2598 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
2599 | static struct file_operations version_fops = { | |
2600 | .open = sg_proc_single_open_version, | |
2601 | .release = single_release, | |
2602 | }; | |
2603 | ||
2604 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2605 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
2606 | static struct file_operations devhdr_fops = { | |
2607 | .open = sg_proc_single_open_devhdr, | |
2608 | .release = single_release, | |
2609 | }; | |
2610 | ||
2611 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2612 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2613 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2614 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2615 | static void dev_seq_stop(struct seq_file *s, void *v); | |
2616 | static struct file_operations dev_fops = { | |
2617 | .open = sg_proc_open_dev, | |
2618 | .release = seq_release, | |
2619 | }; | |
2620 | static struct seq_operations dev_seq_ops = { | |
2621 | .start = dev_seq_start, | |
2622 | .next = dev_seq_next, | |
2623 | .stop = dev_seq_stop, | |
2624 | .show = sg_proc_seq_show_dev, | |
2625 | }; | |
2626 | ||
2627 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2628 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
2629 | static struct file_operations devstrs_fops = { | |
2630 | .open = sg_proc_open_devstrs, | |
2631 | .release = seq_release, | |
2632 | }; | |
2633 | static struct seq_operations devstrs_seq_ops = { | |
2634 | .start = dev_seq_start, | |
2635 | .next = dev_seq_next, | |
2636 | .stop = dev_seq_stop, | |
2637 | .show = sg_proc_seq_show_devstrs, | |
2638 | }; | |
2639 | ||
2640 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2641 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
2642 | static struct file_operations debug_fops = { | |
2643 | .open = sg_proc_open_debug, | |
2644 | .release = seq_release, | |
2645 | }; | |
2646 | static struct seq_operations debug_seq_ops = { | |
2647 | .start = dev_seq_start, | |
2648 | .next = dev_seq_next, | |
2649 | .stop = dev_seq_stop, | |
2650 | .show = sg_proc_seq_show_debug, | |
2651 | }; | |
2652 | ||
2653 | ||
2654 | struct sg_proc_leaf { | |
2655 | const char * name; | |
2656 | struct file_operations * fops; | |
2657 | }; | |
2658 | ||
2659 | static struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2660 | {"allow_dio", &adio_fops}, | |
2661 | {"debug", &debug_fops}, | |
2662 | {"def_reserved_size", &dressz_fops}, | |
2663 | {"device_hdr", &devhdr_fops}, | |
2664 | {"devices", &dev_fops}, | |
2665 | {"device_strs", &devstrs_fops}, | |
2666 | {"version", &version_fops} | |
2667 | }; | |
2668 | ||
2669 | static int | |
2670 | sg_proc_init(void) | |
2671 | { | |
2672 | int k, mask; | |
2673 | int num_leaves = | |
2674 | sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); | |
2675 | struct proc_dir_entry *pdep; | |
2676 | struct sg_proc_leaf * leaf; | |
2677 | ||
66600221 | 2678 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2679 | if (!sg_proc_sgp) |
2680 | return 1; | |
2681 | for (k = 0; k < num_leaves; ++k) { | |
2682 | leaf = &sg_proc_leaf_arr[k]; | |
2683 | mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
2684 | pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); | |
2685 | if (pdep) { | |
2686 | leaf->fops->owner = THIS_MODULE, | |
2687 | leaf->fops->read = seq_read, | |
2688 | leaf->fops->llseek = seq_lseek, | |
2689 | pdep->proc_fops = leaf->fops; | |
2690 | } | |
2691 | } | |
2692 | return 0; | |
2693 | } | |
2694 | ||
2695 | static void | |
2696 | sg_proc_cleanup(void) | |
2697 | { | |
2698 | int k; | |
2699 | int num_leaves = | |
2700 | sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); | |
2701 | ||
2702 | if (!sg_proc_sgp) | |
2703 | return; | |
2704 | for (k = 0; k < num_leaves; ++k) | |
2705 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2706 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2707 | } | |
2708 | ||
2709 | ||
2710 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2711 | { | |
2712 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2713 | return 0; | |
2714 | } | |
2715 | ||
2716 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2717 | { | |
2718 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2719 | } | |
2720 | ||
2721 | static ssize_t | |
2722 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2723 | size_t count, loff_t *off) | |
2724 | { | |
2725 | int num; | |
2726 | char buff[11]; | |
2727 | ||
2728 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2729 | return -EACCES; | |
2730 | num = (count < 10) ? count : 10; | |
2731 | if (copy_from_user(buff, buffer, num)) | |
2732 | return -EFAULT; | |
2733 | buff[num] = '\0'; | |
2734 | sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; | |
2735 | return count; | |
2736 | } | |
2737 | ||
2738 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2739 | { | |
2740 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2741 | } | |
2742 | ||
2743 | static ssize_t | |
2744 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2745 | size_t count, loff_t *off) | |
2746 | { | |
2747 | int num; | |
2748 | unsigned long k = ULONG_MAX; | |
2749 | char buff[11]; | |
2750 | ||
2751 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2752 | return -EACCES; | |
2753 | num = (count < 10) ? count : 10; | |
2754 | if (copy_from_user(buff, buffer, num)) | |
2755 | return -EFAULT; | |
2756 | buff[num] = '\0'; | |
2757 | k = simple_strtoul(buff, NULL, 10); | |
2758 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2759 | sg_big_buff = k; | |
2760 | return count; | |
2761 | } | |
2762 | return -ERANGE; | |
2763 | } | |
2764 | ||
2765 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2766 | { | |
2767 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2768 | sg_version_date); | |
2769 | return 0; | |
2770 | } | |
2771 | ||
2772 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2773 | { | |
2774 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2775 | } | |
2776 | ||
2777 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2778 | { | |
2779 | seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" | |
2780 | "online\n"); | |
2781 | return 0; | |
2782 | } | |
2783 | ||
2784 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2785 | { | |
2786 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2787 | } | |
2788 | ||
2789 | struct sg_proc_deviter { | |
2790 | loff_t index; | |
2791 | size_t max; | |
2792 | }; | |
2793 | ||
2794 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2795 | { | |
2796 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2797 | ||
729d70f5 | 2798 | s->private = it; |
1da177e4 LT |
2799 | if (! it) |
2800 | return NULL; | |
729d70f5 | 2801 | |
1da177e4 | 2802 | if (NULL == sg_dev_arr) |
729d70f5 | 2803 | return NULL; |
1da177e4 LT |
2804 | it->index = *pos; |
2805 | it->max = sg_last_dev(); | |
2806 | if (it->index >= it->max) | |
729d70f5 | 2807 | return NULL; |
1da177e4 | 2808 | return it; |
1da177e4 LT |
2809 | } |
2810 | ||
2811 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2812 | { | |
729d70f5 | 2813 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2814 | |
2815 | *pos = ++it->index; | |
2816 | return (it->index < it->max) ? it : NULL; | |
2817 | } | |
2818 | ||
2819 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2820 | { | |
729d70f5 | 2821 | kfree(s->private); |
1da177e4 LT |
2822 | } |
2823 | ||
2824 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2825 | { | |
2826 | return seq_open(file, &dev_seq_ops); | |
2827 | } | |
2828 | ||
2829 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2830 | { | |
2831 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2832 | Sg_device *sdp; | |
2833 | struct scsi_device *scsidp; | |
2834 | ||
2835 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2836 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2837 | seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", | |
2838 | scsidp->host->host_no, scsidp->channel, | |
2839 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2840 | 1, | |
2841 | (int) scsidp->queue_depth, | |
2842 | (int) scsidp->device_busy, | |
2843 | (int) scsi_device_online(scsidp)); | |
2844 | else | |
2845 | seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2846 | return 0; | |
2847 | } | |
2848 | ||
2849 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
2850 | { | |
2851 | return seq_open(file, &devstrs_seq_ops); | |
2852 | } | |
2853 | ||
2854 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
2855 | { | |
2856 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2857 | Sg_device *sdp; | |
2858 | struct scsi_device *scsidp; | |
2859 | ||
2860 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2861 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2862 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
2863 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2864 | else | |
2865 | seq_printf(s, "<no active device>\n"); | |
2866 | return 0; | |
2867 | } | |
2868 | ||
2869 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) | |
2870 | { | |
2871 | int k, m, new_interface, blen, usg; | |
2872 | Sg_request *srp; | |
2873 | Sg_fd *fp; | |
2874 | const sg_io_hdr_t *hp; | |
2875 | const char * cp; | |
cb59e840 | 2876 | unsigned int ms; |
1da177e4 LT |
2877 | |
2878 | for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { | |
2879 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " | |
2880 | "(res)sgat=%d low_dma=%d\n", k + 1, | |
2881 | jiffies_to_msecs(fp->timeout), | |
2882 | fp->reserve.bufflen, | |
2883 | (int) fp->reserve.k_use_sg, | |
2884 | (int) fp->low_dma); | |
2885 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", | |
2886 | (int) fp->cmd_q, (int) fp->force_packid, | |
2887 | (int) fp->keep_orphan, (int) fp->closed); | |
2888 | for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { | |
2889 | hp = &srp->header; | |
2890 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2891 | if (srp->res_used) { | |
2892 | if (new_interface && | |
2893 | (SG_FLAG_MMAP_IO & hp->flags)) | |
2894 | cp = " mmap>> "; | |
2895 | else | |
2896 | cp = " rb>> "; | |
2897 | } else { | |
2898 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2899 | cp = " dio>> "; | |
2900 | else | |
2901 | cp = " "; | |
2902 | } | |
2903 | seq_printf(s, cp); | |
d6b10348 MC |
2904 | blen = srp->data.bufflen; |
2905 | usg = srp->data.k_use_sg; | |
1da177e4 LT |
2906 | seq_printf(s, srp->done ? |
2907 | ((1 == srp->done) ? "rcv:" : "fin:") | |
d6b10348 | 2908 | : "act:"); |
1da177e4 LT |
2909 | seq_printf(s, " id=%d blen=%d", |
2910 | srp->header.pack_id, blen); | |
2911 | if (srp->done) | |
2912 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 DG |
2913 | else { |
2914 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2915 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 DG |
2916 | (new_interface ? hp->timeout : |
2917 | jiffies_to_msecs(fp->timeout)), | |
2918 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2919 | } | |
1da177e4 LT |
2920 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2921 | (int) srp->data.cmd_opcode); | |
2922 | } | |
2923 | if (0 == m) | |
2924 | seq_printf(s, " No requests active\n"); | |
2925 | } | |
2926 | } | |
2927 | ||
2928 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
2929 | { | |
2930 | return seq_open(file, &debug_seq_ops); | |
2931 | } | |
2932 | ||
2933 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
2934 | { | |
2935 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2936 | Sg_device *sdp; | |
2937 | ||
2938 | if (it && (0 == it->index)) { | |
2939 | seq_printf(s, "dev_max(currently)=%d max_active_device=%d " | |
2940 | "(origin 1)\n", sg_dev_max, (int)it->max); | |
2941 | seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); | |
2942 | } | |
2943 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2944 | if (sdp) { | |
2945 | struct scsi_device *scsidp = sdp->device; | |
2946 | ||
2947 | if (NULL == scsidp) { | |
2948 | seq_printf(s, "device %d detached ??\n", | |
2949 | (int)it->index); | |
2950 | return 0; | |
2951 | } | |
2952 | ||
2953 | if (sg_get_nth_sfp(sdp, 0)) { | |
2954 | seq_printf(s, " >>> device=%s ", | |
2955 | sdp->disk->disk_name); | |
2956 | if (sdp->detached) | |
2957 | seq_printf(s, "detached pending close "); | |
2958 | else | |
2959 | seq_printf | |
2960 | (s, "scsi%d chan=%d id=%d lun=%d em=%d", | |
2961 | scsidp->host->host_no, | |
2962 | scsidp->channel, scsidp->id, | |
2963 | scsidp->lun, | |
2964 | scsidp->host->hostt->emulated); | |
2965 | seq_printf(s, " sg_tablesize=%d excl=%d\n", | |
2966 | sdp->sg_tablesize, sdp->exclude); | |
2967 | } | |
2968 | sg_proc_debug_helper(s, sdp); | |
2969 | } | |
2970 | return 0; | |
2971 | } | |
2972 | ||
2973 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2974 | ||
2975 | module_init(init_sg); | |
2976 | module_exit(exit_sg); | |
2977 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |