Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * History: | |
3 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), | |
4 | * to allow user process control of SCSI devices. | |
5 | * Development Sponsored by Killy Corp. NY NY | |
6 | * | |
7 | * Original driver (sg.c): | |
8 | * Copyright (C) 1992 Lawrence Foard | |
9 | * Version 2 and 3 extensions to driver: | |
10 | * Copyright (C) 1998 - 2005 Douglas Gilbert | |
11 | * | |
12 | * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | ||
b2155d04 DG |
21 | static int sg_version_num = 30534; /* 2 digits for each component */ |
22 | #define SG_VERSION_STR "3.5.34" | |
1da177e4 LT |
23 | |
24 | /* | |
25 | * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: | |
26 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First | |
27 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING | |
28 | * (otherwise the macros compile to empty statements). | |
29 | * | |
30 | */ | |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | ||
33 | #include <linux/fs.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/string.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/mtio.h> | |
40 | #include <linux/ioctl.h> | |
41 | #include <linux/fcntl.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/poll.h> | |
1da177e4 | 44 | #include <linux/moduleparam.h> |
1da177e4 | 45 | #include <linux/cdev.h> |
7c07d613 | 46 | #include <linux/idr.h> |
1da177e4 LT |
47 | #include <linux/seq_file.h> |
48 | #include <linux/blkdev.h> | |
49 | #include <linux/delay.h> | |
378f058c | 50 | #include <linux/scatterlist.h> |
6da127ad | 51 | #include <linux/blktrace_api.h> |
1da177e4 LT |
52 | |
53 | #include "scsi.h" | |
db9dff36 | 54 | #include <scsi/scsi_dbg.h> |
1da177e4 LT |
55 | #include <scsi/scsi_host.h> |
56 | #include <scsi/scsi_driver.h> | |
57 | #include <scsi/scsi_ioctl.h> | |
58 | #include <scsi/sg.h> | |
59 | ||
60 | #include "scsi_logging.h" | |
61 | ||
62 | #ifdef CONFIG_SCSI_PROC_FS | |
63 | #include <linux/proc_fs.h> | |
7ca63cb4 | 64 | static char *sg_version_date = "20061027"; |
1da177e4 LT |
65 | |
66 | static int sg_proc_init(void); | |
67 | static void sg_proc_cleanup(void); | |
68 | #endif | |
69 | ||
1da177e4 LT |
70 | #define SG_ALLOW_DIO_DEF 0 |
71 | #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ | |
72 | ||
73 | #define SG_MAX_DEVS 32768 | |
74 | ||
75 | /* | |
76 | * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) | |
77 | * Then when using 32 bit integers x * m may overflow during the calculation. | |
78 | * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m | |
79 | * calculates the same, but prevents the overflow when both m and d | |
80 | * are "small" numbers (like HZ and USER_HZ). | |
81 | * Of course an overflow is inavoidable if the result of muldiv doesn't fit | |
82 | * in 32 bits. | |
83 | */ | |
84 | #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) | |
85 | ||
86 | #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) | |
87 | ||
88 | int sg_big_buff = SG_DEF_RESERVED_SIZE; | |
89 | /* N.B. This variable is readable and writeable via | |
90 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
91 | of this size (or less if there is not enough memory) will be reserved | |
92 | for use by this file descriptor. [Deprecated usage: this variable is also | |
93 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
94 | the kernel (i.e. it is not a module).] */ | |
95 | static int def_reserved_size = -1; /* picks up init parameter */ | |
96 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
97 | ||
6460e75a DG |
98 | static int scatter_elem_sz = SG_SCATTER_SZ; |
99 | static int scatter_elem_sz_prev = SG_SCATTER_SZ; | |
100 | ||
1da177e4 LT |
101 | #define SG_SECTOR_SZ 512 |
102 | #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) | |
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 | |
7c07d613 JB |
107 | static DEFINE_IDR(sg_index_idr); |
108 | static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock | |
1da177e4 LT |
109 | file descriptor list for device */ |
110 | ||
111 | static struct class_interface sg_interface = { | |
112 | .add = sg_add, | |
113 | .remove = sg_remove, | |
114 | }; | |
115 | ||
116 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
117 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
ea312552 | 118 | unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ |
1da177e4 LT |
119 | unsigned bufflen; /* Size of (aggregate) data buffer */ |
120 | unsigned b_malloc_len; /* actual len malloc'ed in buffer */ | |
d6b10348 | 121 | struct scatterlist *buffer;/* scatter list */ |
1da177e4 LT |
122 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ |
123 | unsigned char cmd_opcode; /* first byte of command */ | |
124 | } Sg_scatter_hold; | |
125 | ||
126 | struct sg_device; /* forward declarations */ | |
127 | struct sg_fd; | |
128 | ||
129 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
1da177e4 LT |
130 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ |
131 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
132 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
133 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
d6b10348 | 134 | unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; |
1da177e4 LT |
135 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ |
136 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
137 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
138 | volatile char done; /* 0->before bh, 1->before read, 2->read */ | |
139 | } Sg_request; | |
140 | ||
141 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
142 | struct sg_fd *nextfp; /* NULL when last opened fd on this device */ | |
143 | struct sg_device *parentdp; /* owning device */ | |
144 | wait_queue_head_t read_wait; /* queue read until command done */ | |
145 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
146 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
147 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
148 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
149 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
150 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
151 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
152 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
153 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
154 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
155 | volatile char closed; /* 1 -> fd closed but request(s) outstanding */ | |
156 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
157 | char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ | |
158 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
159 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
160 | } Sg_fd; | |
161 | ||
162 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
163 | struct scsi_device *device; | |
164 | wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ | |
165 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
7c07d613 | 166 | u32 index; /* device index number */ |
1da177e4 LT |
167 | Sg_fd *headfp; /* first open fd belonging to this device */ |
168 | volatile char detached; /* 0->attached, 1->detached pending removal */ | |
169 | volatile char exclude; /* opened for exclusive access */ | |
170 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ | |
171 | struct gendisk *disk; | |
172 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
173 | } Sg_device; | |
174 | ||
175 | static int sg_fasync(int fd, struct file *filp, int mode); | |
d6b10348 MC |
176 | /* tasklet or soft irq callback */ |
177 | static void sg_cmd_done(void *data, char *sense, int result, int resid); | |
1da177e4 LT |
178 | static int sg_start_req(Sg_request * srp); |
179 | static void sg_finish_rem_req(Sg_request * srp); | |
180 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); | |
181 | static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, | |
182 | int tablesize); | |
183 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, | |
184 | Sg_request * srp); | |
185 | static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, | |
186 | int blocking, int read_only, Sg_request ** o_srp); | |
187 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
188 | unsigned char *cmnd, int timeout, int blocking); | |
189 | static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
190 | int wr_xf, int *countp, unsigned char __user **up); | |
191 | static int sg_write_xfer(Sg_request * srp); | |
192 | static int sg_read_xfer(Sg_request * srp); | |
193 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); | |
194 | static void sg_remove_scat(Sg_scatter_hold * schp); | |
195 | static void sg_build_reserve(Sg_fd * sfp, int req_size); | |
196 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
197 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
d6b10348 MC |
198 | static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp); |
199 | static void sg_page_free(struct page *page, int size); | |
1da177e4 LT |
200 | static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); |
201 | static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
202 | static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
203 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); | |
204 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
205 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
206 | static int sg_res_in_use(Sg_fd * sfp); | |
207 | static int sg_allow_access(unsigned char opcode, char dev_type); | |
208 | static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); | |
209 | static Sg_device *sg_get_dev(int dev); | |
1da177e4 LT |
210 | #ifdef CONFIG_SCSI_PROC_FS |
211 | static int sg_last_dev(void); | |
212 | #endif | |
213 | ||
1da177e4 LT |
214 | #define SZ_SG_HEADER sizeof(struct sg_header) |
215 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
216 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
217 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
218 | ||
219 | static int | |
220 | sg_open(struct inode *inode, struct file *filp) | |
221 | { | |
222 | int dev = iminor(inode); | |
223 | int flags = filp->f_flags; | |
d6b10348 | 224 | struct request_queue *q; |
1da177e4 LT |
225 | Sg_device *sdp; |
226 | Sg_fd *sfp; | |
227 | int res; | |
228 | int retval; | |
229 | ||
230 | nonseekable_open(inode, filp); | |
231 | SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); | |
232 | sdp = sg_get_dev(dev); | |
233 | if ((!sdp) || (!sdp->device)) | |
234 | return -ENXIO; | |
235 | if (sdp->detached) | |
236 | return -ENODEV; | |
237 | ||
238 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
239 | /* Prevent the device driver from vanishing while we sleep */ | |
240 | retval = scsi_device_get(sdp->device); | |
241 | if (retval) | |
242 | return retval; | |
243 | ||
244 | if (!((flags & O_NONBLOCK) || | |
245 | scsi_block_when_processing_errors(sdp->device))) { | |
246 | retval = -ENXIO; | |
247 | /* we are in error recovery for this device */ | |
248 | goto error_out; | |
249 | } | |
250 | ||
251 | if (flags & O_EXCL) { | |
252 | if (O_RDONLY == (flags & O_ACCMODE)) { | |
253 | retval = -EPERM; /* Can't lock it with read only access */ | |
254 | goto error_out; | |
255 | } | |
256 | if (sdp->headfp && (flags & O_NONBLOCK)) { | |
257 | retval = -EBUSY; | |
258 | goto error_out; | |
259 | } | |
260 | res = 0; | |
261 | __wait_event_interruptible(sdp->o_excl_wait, | |
262 | ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); | |
263 | if (res) { | |
264 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
265 | goto error_out; | |
266 | } | |
267 | } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ | |
268 | if (flags & O_NONBLOCK) { | |
269 | retval = -EBUSY; | |
270 | goto error_out; | |
271 | } | |
272 | res = 0; | |
273 | __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), | |
274 | res); | |
275 | if (res) { | |
276 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
277 | goto error_out; | |
278 | } | |
279 | } | |
280 | if (sdp->detached) { | |
281 | retval = -ENODEV; | |
282 | goto error_out; | |
283 | } | |
284 | if (!sdp->headfp) { /* no existing opens on this device */ | |
285 | sdp->sgdebug = 0; | |
d6b10348 MC |
286 | q = sdp->device->request_queue; |
287 | sdp->sg_tablesize = min(q->max_hw_segments, | |
288 | q->max_phys_segments); | |
1da177e4 LT |
289 | } |
290 | if ((sfp = sg_add_sfp(sdp, dev))) | |
291 | filp->private_data = sfp; | |
292 | else { | |
293 | if (flags & O_EXCL) | |
294 | sdp->exclude = 0; /* undo if error */ | |
295 | retval = -ENOMEM; | |
296 | goto error_out; | |
297 | } | |
298 | return 0; | |
299 | ||
300 | error_out: | |
301 | scsi_device_put(sdp->device); | |
302 | return retval; | |
303 | } | |
304 | ||
305 | /* Following function was formerly called 'sg_close' */ | |
306 | static int | |
307 | sg_release(struct inode *inode, struct file *filp) | |
308 | { | |
309 | Sg_device *sdp; | |
310 | Sg_fd *sfp; | |
311 | ||
312 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
313 | return -ENXIO; | |
314 | SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); | |
315 | sg_fasync(-1, filp, 0); /* remove filp from async notification list */ | |
316 | if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ | |
317 | if (!sdp->detached) { | |
318 | scsi_device_put(sdp->device); | |
319 | } | |
320 | sdp->exclude = 0; | |
321 | wake_up_interruptible(&sdp->o_excl_wait); | |
322 | } | |
323 | return 0; | |
324 | } | |
325 | ||
326 | static ssize_t | |
327 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
328 | { | |
1da177e4 LT |
329 | Sg_device *sdp; |
330 | Sg_fd *sfp; | |
331 | Sg_request *srp; | |
332 | int req_pack_id = -1; | |
1da177e4 | 333 | sg_io_hdr_t *hp; |
cb59e840 DG |
334 | struct sg_header *old_hdr = NULL; |
335 | int retval = 0; | |
1da177e4 LT |
336 | |
337 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
338 | return -ENXIO; | |
339 | SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", | |
340 | sdp->disk->disk_name, (int) count)); | |
d6b10348 | 341 | |
1da177e4 LT |
342 | if (!access_ok(VERIFY_WRITE, buf, count)) |
343 | return -EFAULT; | |
344 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 DG |
345 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
346 | if (!old_hdr) | |
347 | return -ENOMEM; | |
348 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
349 | retval = -EFAULT; | |
350 | goto free_old_hdr; | |
351 | } | |
352 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 353 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 DG |
354 | sg_io_hdr_t *new_hdr; |
355 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
356 | if (!new_hdr) { | |
357 | retval = -ENOMEM; | |
358 | goto free_old_hdr; | |
359 | } | |
360 | retval =__copy_from_user | |
361 | (new_hdr, buf, SZ_SG_IO_HDR); | |
362 | req_pack_id = new_hdr->pack_id; | |
363 | kfree(new_hdr); | |
364 | if (retval) { | |
365 | retval = -EFAULT; | |
366 | goto free_old_hdr; | |
367 | } | |
1da177e4 LT |
368 | } |
369 | } else | |
cb59e840 | 370 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
371 | } |
372 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
373 | if (!srp) { /* now wait on packet to arrive */ | |
cb59e840 DG |
374 | if (sdp->detached) { |
375 | retval = -ENODEV; | |
376 | goto free_old_hdr; | |
377 | } | |
378 | if (filp->f_flags & O_NONBLOCK) { | |
379 | retval = -EAGAIN; | |
380 | goto free_old_hdr; | |
381 | } | |
1da177e4 | 382 | while (1) { |
cb59e840 | 383 | retval = 0; /* following macro beats race condition */ |
1da177e4 | 384 | __wait_event_interruptible(sfp->read_wait, |
cb59e840 DG |
385 | (sdp->detached || |
386 | (srp = sg_get_rq_mark(sfp, req_pack_id))), | |
387 | retval); | |
388 | if (sdp->detached) { | |
389 | retval = -ENODEV; | |
390 | goto free_old_hdr; | |
391 | } | |
392 | if (0 == retval) | |
1da177e4 | 393 | break; |
cb59e840 DG |
394 | |
395 | /* -ERESTARTSYS as signal hit process */ | |
396 | goto free_old_hdr; | |
1da177e4 LT |
397 | } |
398 | } | |
cb59e840 DG |
399 | if (srp->header.interface_id != '\0') { |
400 | retval = sg_new_read(sfp, buf, count, srp); | |
401 | goto free_old_hdr; | |
402 | } | |
1da177e4 LT |
403 | |
404 | hp = &srp->header; | |
cb59e840 DG |
405 | if (old_hdr == NULL) { |
406 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
407 | if (! old_hdr) { | |
408 | retval = -ENOMEM; | |
409 | goto free_old_hdr; | |
410 | } | |
411 | } | |
412 | memset(old_hdr, 0, SZ_SG_HEADER); | |
413 | old_hdr->reply_len = (int) hp->timeout; | |
414 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
415 | old_hdr->pack_id = hp->pack_id; | |
416 | old_hdr->twelve_byte = | |
1da177e4 | 417 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 DG |
418 | old_hdr->target_status = hp->masked_status; |
419 | old_hdr->host_status = hp->host_status; | |
420 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
421 | if ((CHECK_CONDITION & hp->masked_status) || |
422 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 DG |
423 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
424 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
425 | switch (hp->host_status) { |
426 | /* This setup of 'result' is for backward compatibility and is best | |
427 | ignored by the user who should use target, host + driver status */ | |
428 | case DID_OK: | |
429 | case DID_PASSTHROUGH: | |
430 | case DID_SOFT_ERROR: | |
cb59e840 | 431 | old_hdr->result = 0; |
1da177e4 LT |
432 | break; |
433 | case DID_NO_CONNECT: | |
434 | case DID_BUS_BUSY: | |
435 | case DID_TIME_OUT: | |
cb59e840 | 436 | old_hdr->result = EBUSY; |
1da177e4 LT |
437 | break; |
438 | case DID_BAD_TARGET: | |
439 | case DID_ABORT: | |
440 | case DID_PARITY: | |
441 | case DID_RESET: | |
442 | case DID_BAD_INTR: | |
cb59e840 | 443 | old_hdr->result = EIO; |
1da177e4 LT |
444 | break; |
445 | case DID_ERROR: | |
cb59e840 | 446 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
447 | hp->masked_status == GOOD) ? 0 : EIO; |
448 | break; | |
449 | default: | |
cb59e840 | 450 | old_hdr->result = EIO; |
1da177e4 LT |
451 | break; |
452 | } | |
453 | ||
454 | /* Now copy the result back to the user buffer. */ | |
455 | if (count >= SZ_SG_HEADER) { | |
cb59e840 DG |
456 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
457 | retval = -EFAULT; | |
458 | goto free_old_hdr; | |
459 | } | |
1da177e4 | 460 | buf += SZ_SG_HEADER; |
cb59e840 DG |
461 | if (count > old_hdr->reply_len) |
462 | count = old_hdr->reply_len; | |
1da177e4 | 463 | if (count > SZ_SG_HEADER) { |
cb59e840 DG |
464 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
465 | retval = -EFAULT; | |
466 | goto free_old_hdr; | |
467 | } | |
1da177e4 LT |
468 | } |
469 | } else | |
cb59e840 | 470 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 471 | sg_finish_rem_req(srp); |
cb59e840 DG |
472 | retval = count; |
473 | free_old_hdr: | |
c9475cb0 | 474 | kfree(old_hdr); |
cb59e840 | 475 | return retval; |
1da177e4 LT |
476 | } |
477 | ||
478 | static ssize_t | |
479 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
480 | { | |
481 | sg_io_hdr_t *hp = &srp->header; | |
482 | int err = 0; | |
483 | int len; | |
484 | ||
485 | if (count < SZ_SG_IO_HDR) { | |
486 | err = -EINVAL; | |
487 | goto err_out; | |
488 | } | |
489 | hp->sb_len_wr = 0; | |
490 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
491 | if ((CHECK_CONDITION & hp->masked_status) || | |
492 | (DRIVER_SENSE & hp->driver_status)) { | |
d6b10348 | 493 | int sb_len = SCSI_SENSE_BUFFERSIZE; |
1da177e4 LT |
494 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; |
495 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
496 | len = (len > sb_len) ? sb_len : len; | |
497 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
498 | err = -EFAULT; | |
499 | goto err_out; | |
500 | } | |
501 | hp->sb_len_wr = len; | |
502 | } | |
503 | } | |
504 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
505 | hp->info |= SG_INFO_CHECK; | |
506 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
507 | err = -EFAULT; | |
508 | goto err_out; | |
509 | } | |
510 | err = sg_read_xfer(srp); | |
511 | err_out: | |
512 | sg_finish_rem_req(srp); | |
513 | return (0 == err) ? count : err; | |
514 | } | |
515 | ||
516 | static ssize_t | |
517 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
518 | { | |
519 | int mxsize, cmd_size, k; | |
520 | int input_size, blocking; | |
521 | unsigned char opcode; | |
522 | Sg_device *sdp; | |
523 | Sg_fd *sfp; | |
524 | Sg_request *srp; | |
525 | struct sg_header old_hdr; | |
526 | sg_io_hdr_t *hp; | |
d6b10348 | 527 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
528 | |
529 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
530 | return -ENXIO; | |
531 | SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", | |
532 | sdp->disk->disk_name, (int) count)); | |
533 | if (sdp->detached) | |
534 | return -ENODEV; | |
535 | if (!((filp->f_flags & O_NONBLOCK) || | |
536 | scsi_block_when_processing_errors(sdp->device))) | |
537 | return -ENXIO; | |
538 | ||
539 | if (!access_ok(VERIFY_READ, buf, count)) | |
540 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
541 | if (count < SZ_SG_HEADER) | |
542 | return -EIO; | |
543 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
544 | return -EFAULT; | |
545 | blocking = !(filp->f_flags & O_NONBLOCK); | |
546 | if (old_hdr.reply_len < 0) | |
547 | return sg_new_write(sfp, buf, count, blocking, 0, NULL); | |
548 | if (count < (SZ_SG_HEADER + 6)) | |
549 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
550 | ||
551 | if (!(srp = sg_add_request(sfp))) { | |
552 | SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); | |
553 | return -EDOM; | |
554 | } | |
555 | buf += SZ_SG_HEADER; | |
556 | __get_user(opcode, buf); | |
557 | if (sfp->next_cmd_len > 0) { | |
558 | if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { | |
559 | SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); | |
560 | sfp->next_cmd_len = 0; | |
561 | sg_remove_request(sfp, srp); | |
562 | return -EIO; | |
563 | } | |
564 | cmd_size = sfp->next_cmd_len; | |
565 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
566 | } else { | |
567 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
568 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
569 | cmd_size = 12; | |
570 | } | |
571 | SCSI_LOG_TIMEOUT(4, printk( | |
572 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
573 | /* Determine buffer size. */ | |
574 | input_size = count - cmd_size; | |
575 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
576 | mxsize -= SZ_SG_HEADER; | |
577 | input_size -= SZ_SG_HEADER; | |
578 | if (input_size < 0) { | |
579 | sg_remove_request(sfp, srp); | |
580 | return -EIO; /* User did not pass enough bytes for this command. */ | |
581 | } | |
582 | hp = &srp->header; | |
583 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
584 | hp->cmd_len = (unsigned char) cmd_size; | |
585 | hp->iovec_count = 0; | |
586 | hp->mx_sb_len = 0; | |
587 | if (input_size > 0) | |
588 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
589 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
590 | else | |
591 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
592 | hp->dxfer_len = mxsize; | |
593 | hp->dxferp = (char __user *)buf + cmd_size; | |
594 | hp->sbp = NULL; | |
595 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
596 | hp->flags = input_size; /* structure abuse ... */ | |
597 | hp->pack_id = old_hdr.pack_id; | |
598 | hp->usr_ptr = NULL; | |
599 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
600 | return -EFAULT; | |
601 | /* | |
602 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
603 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
604 | * is a non-zero input_size, so emit a warning. | |
605 | */ | |
eaa3e22e AK |
606 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { |
607 | static char cmd[TASK_COMM_LEN]; | |
608 | if (strcmp(current->comm, cmd) && printk_ratelimit()) { | |
1da177e4 LT |
609 | printk(KERN_WARNING |
610 | "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" | |
611 | "guessing data in;\n" KERN_WARNING " " | |
612 | "program %s not setting count and/or reply_len properly\n", | |
613 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
614 | input_size, (unsigned int) cmnd[0], | |
615 | current->comm); | |
eaa3e22e AK |
616 | strcpy(cmd, current->comm); |
617 | } | |
618 | } | |
1da177e4 LT |
619 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); |
620 | return (k < 0) ? k : count; | |
621 | } | |
622 | ||
623 | static ssize_t | |
624 | sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, | |
625 | int blocking, int read_only, Sg_request ** o_srp) | |
626 | { | |
627 | int k; | |
628 | Sg_request *srp; | |
629 | sg_io_hdr_t *hp; | |
d6b10348 | 630 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 LT |
631 | int timeout; |
632 | unsigned long ul_timeout; | |
633 | ||
634 | if (count < SZ_SG_IO_HDR) | |
635 | return -EINVAL; | |
636 | if (!access_ok(VERIFY_READ, buf, count)) | |
637 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
638 | ||
639 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
640 | if (!(srp = sg_add_request(sfp))) { | |
641 | SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); | |
642 | return -EDOM; | |
643 | } | |
644 | hp = &srp->header; | |
645 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
646 | sg_remove_request(sfp, srp); | |
647 | return -EFAULT; | |
648 | } | |
649 | if (hp->interface_id != 'S') { | |
650 | sg_remove_request(sfp, srp); | |
651 | return -ENOSYS; | |
652 | } | |
653 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
654 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
655 | sg_remove_request(sfp, srp); | |
656 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
657 | } | |
658 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
659 | sg_remove_request(sfp, srp); | |
660 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
661 | } | |
662 | if (sg_res_in_use(sfp)) { | |
663 | sg_remove_request(sfp, srp); | |
664 | return -EBUSY; /* reserve buffer already being used */ | |
665 | } | |
666 | } | |
667 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
668 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
669 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
670 | sg_remove_request(sfp, srp); | |
671 | return -EMSGSIZE; | |
672 | } | |
673 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
674 | sg_remove_request(sfp, srp); | |
675 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
676 | } | |
677 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
678 | sg_remove_request(sfp, srp); | |
679 | return -EFAULT; | |
680 | } | |
681 | if (read_only && | |
682 | (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { | |
683 | sg_remove_request(sfp, srp); | |
684 | return -EPERM; | |
685 | } | |
686 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
687 | if (k < 0) | |
688 | return k; | |
689 | if (o_srp) | |
690 | *o_srp = srp; | |
691 | return count; | |
692 | } | |
693 | ||
694 | static int | |
695 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
696 | unsigned char *cmnd, int timeout, int blocking) | |
697 | { | |
d6b10348 | 698 | int k, data_dir; |
1da177e4 LT |
699 | Sg_device *sdp = sfp->parentdp; |
700 | sg_io_hdr_t *hp = &srp->header; | |
1da177e4 LT |
701 | |
702 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
703 | hp->status = 0; | |
704 | hp->masked_status = 0; | |
705 | hp->msg_status = 0; | |
706 | hp->info = 0; | |
707 | hp->host_status = 0; | |
708 | hp->driver_status = 0; | |
709 | hp->resid = 0; | |
710 | SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
711 | (int) cmnd[0], (int) hp->cmd_len)); | |
712 | ||
713 | if ((k = sg_start_req(srp))) { | |
7ca63cb4 | 714 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); |
1da177e4 LT |
715 | sg_finish_rem_req(srp); |
716 | return k; /* probably out of space --> ENOMEM */ | |
717 | } | |
718 | if ((k = sg_write_xfer(srp))) { | |
7ca63cb4 | 719 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n")); |
1da177e4 LT |
720 | sg_finish_rem_req(srp); |
721 | return k; | |
722 | } | |
723 | if (sdp->detached) { | |
724 | sg_finish_rem_req(srp); | |
725 | return -ENODEV; | |
726 | } | |
1da177e4 | 727 | |
1da177e4 LT |
728 | switch (hp->dxfer_direction) { |
729 | case SG_DXFER_TO_FROM_DEV: | |
730 | case SG_DXFER_FROM_DEV: | |
d6b10348 | 731 | data_dir = DMA_FROM_DEVICE; |
1da177e4 LT |
732 | break; |
733 | case SG_DXFER_TO_DEV: | |
d6b10348 | 734 | data_dir = DMA_TO_DEVICE; |
1da177e4 LT |
735 | break; |
736 | case SG_DXFER_UNKNOWN: | |
d6b10348 | 737 | data_dir = DMA_BIDIRECTIONAL; |
1da177e4 LT |
738 | break; |
739 | default: | |
d6b10348 | 740 | data_dir = DMA_NONE; |
1da177e4 LT |
741 | break; |
742 | } | |
cb59e840 | 743 | hp->duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
744 | /* Now send everything of to mid-level. The next time we hear about this |
745 | packet is when sg_cmd_done() is called (i.e. a callback). */ | |
bb1d1073 | 746 | if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer, |
d6b10348 MC |
747 | hp->dxfer_len, srp->data.k_use_sg, timeout, |
748 | SG_DEFAULT_RETRIES, srp, sg_cmd_done, | |
749 | GFP_ATOMIC)) { | |
7ca63cb4 | 750 | SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n")); |
d6b10348 MC |
751 | /* |
752 | * most likely out of mem, but could also be a bad map | |
753 | */ | |
18c49b8c | 754 | sg_finish_rem_req(srp); |
d6b10348 MC |
755 | return -ENOMEM; |
756 | } else | |
757 | return 0; | |
1da177e4 LT |
758 | } |
759 | ||
760 | static int | |
761 | sg_srp_done(Sg_request *srp, Sg_fd *sfp) | |
762 | { | |
763 | unsigned long iflags; | |
764 | int done; | |
765 | ||
766 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
767 | done = srp->done; | |
768 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
769 | return done; | |
770 | } | |
771 | ||
772 | static int | |
773 | sg_ioctl(struct inode *inode, struct file *filp, | |
774 | unsigned int cmd_in, unsigned long arg) | |
775 | { | |
776 | void __user *p = (void __user *)arg; | |
777 | int __user *ip = p; | |
778 | int result, val, read_only; | |
779 | Sg_device *sdp; | |
780 | Sg_fd *sfp; | |
781 | Sg_request *srp; | |
782 | unsigned long iflags; | |
783 | ||
784 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
785 | return -ENXIO; | |
786 | SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", | |
787 | sdp->disk->disk_name, (int) cmd_in)); | |
788 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
789 | ||
790 | switch (cmd_in) { | |
791 | case SG_IO: | |
792 | { | |
793 | int blocking = 1; /* ignore O_NONBLOCK flag */ | |
794 | ||
795 | if (sdp->detached) | |
796 | return -ENODEV; | |
797 | if (!scsi_block_when_processing_errors(sdp->device)) | |
798 | return -ENXIO; | |
799 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
800 | return -EFAULT; | |
801 | result = | |
802 | sg_new_write(sfp, p, SZ_SG_IO_HDR, | |
803 | blocking, read_only, &srp); | |
804 | if (result < 0) | |
805 | return result; | |
806 | srp->sg_io_owned = 1; | |
807 | while (1) { | |
808 | result = 0; /* following macro to beat race condition */ | |
809 | __wait_event_interruptible(sfp->read_wait, | |
810 | (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), | |
811 | result); | |
812 | if (sdp->detached) | |
813 | return -ENODEV; | |
814 | if (sfp->closed) | |
815 | return 0; /* request packet dropped already */ | |
816 | if (0 == result) | |
817 | break; | |
818 | srp->orphan = 1; | |
819 | return result; /* -ERESTARTSYS because signal hit process */ | |
820 | } | |
821 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
822 | srp->done = 2; | |
823 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
824 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); | |
825 | return (result < 0) ? result : 0; | |
826 | } | |
827 | case SG_SET_TIMEOUT: | |
828 | result = get_user(val, ip); | |
829 | if (result) | |
830 | return result; | |
831 | if (val < 0) | |
832 | return -EIO; | |
833 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
834 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
835 | sfp->timeout_user = val; | |
836 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
837 | ||
838 | return 0; | |
839 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
840 | /* strange ..., for backward compatibility */ | |
841 | return sfp->timeout_user; | |
842 | case SG_SET_FORCE_LOW_DMA: | |
843 | result = get_user(val, ip); | |
844 | if (result) | |
845 | return result; | |
846 | if (val) { | |
847 | sfp->low_dma = 1; | |
848 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
849 | val = (int) sfp->reserve.bufflen; | |
850 | sg_remove_scat(&sfp->reserve); | |
851 | sg_build_reserve(sfp, val); | |
852 | } | |
853 | } else { | |
854 | if (sdp->detached) | |
855 | return -ENODEV; | |
856 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
857 | } | |
858 | return 0; | |
859 | case SG_GET_LOW_DMA: | |
860 | return put_user((int) sfp->low_dma, ip); | |
861 | case SG_GET_SCSI_ID: | |
862 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
863 | return -EFAULT; | |
864 | else { | |
865 | sg_scsi_id_t __user *sg_idp = p; | |
866 | ||
867 | if (sdp->detached) | |
868 | return -ENODEV; | |
869 | __put_user((int) sdp->device->host->host_no, | |
870 | &sg_idp->host_no); | |
871 | __put_user((int) sdp->device->channel, | |
872 | &sg_idp->channel); | |
873 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
874 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
875 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
876 | __put_user((short) sdp->device->host->cmd_per_lun, | |
877 | &sg_idp->h_cmd_per_lun); | |
878 | __put_user((short) sdp->device->queue_depth, | |
879 | &sg_idp->d_queue_depth); | |
880 | __put_user(0, &sg_idp->unused[0]); | |
881 | __put_user(0, &sg_idp->unused[1]); | |
882 | return 0; | |
883 | } | |
884 | case SG_SET_FORCE_PACK_ID: | |
885 | result = get_user(val, ip); | |
886 | if (result) | |
887 | return result; | |
888 | sfp->force_packid = val ? 1 : 0; | |
889 | return 0; | |
890 | case SG_GET_PACK_ID: | |
891 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
892 | return -EFAULT; | |
893 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
894 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
895 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
896 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
897 | iflags); | |
898 | __put_user(srp->header.pack_id, ip); | |
899 | return 0; | |
900 | } | |
901 | } | |
902 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
903 | __put_user(-1, ip); | |
904 | return 0; | |
905 | case SG_GET_NUM_WAITING: | |
906 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
907 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
908 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
909 | ++val; | |
910 | } | |
911 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
912 | return put_user(val, ip); | |
913 | case SG_GET_SG_TABLESIZE: | |
914 | return put_user(sdp->sg_tablesize, ip); | |
915 | case SG_SET_RESERVED_SIZE: | |
916 | result = get_user(val, ip); | |
917 | if (result) | |
918 | return result; | |
919 | if (val < 0) | |
920 | return -EINVAL; | |
44ec9542 AS |
921 | val = min_t(int, val, |
922 | sdp->device->request_queue->max_sectors * 512); | |
1da177e4 LT |
923 | if (val != sfp->reserve.bufflen) { |
924 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
925 | return -EBUSY; | |
926 | sg_remove_scat(&sfp->reserve); | |
927 | sg_build_reserve(sfp, val); | |
928 | } | |
929 | return 0; | |
930 | case SG_GET_RESERVED_SIZE: | |
44ec9542 AS |
931 | val = min_t(int, sfp->reserve.bufflen, |
932 | sdp->device->request_queue->max_sectors * 512); | |
1da177e4 LT |
933 | return put_user(val, ip); |
934 | case SG_SET_COMMAND_Q: | |
935 | result = get_user(val, ip); | |
936 | if (result) | |
937 | return result; | |
938 | sfp->cmd_q = val ? 1 : 0; | |
939 | return 0; | |
940 | case SG_GET_COMMAND_Q: | |
941 | return put_user((int) sfp->cmd_q, ip); | |
942 | case SG_SET_KEEP_ORPHAN: | |
943 | result = get_user(val, ip); | |
944 | if (result) | |
945 | return result; | |
946 | sfp->keep_orphan = val; | |
947 | return 0; | |
948 | case SG_GET_KEEP_ORPHAN: | |
949 | return put_user((int) sfp->keep_orphan, ip); | |
950 | case SG_NEXT_CMD_LEN: | |
951 | result = get_user(val, ip); | |
952 | if (result) | |
953 | return result; | |
954 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
955 | return 0; | |
956 | case SG_GET_VERSION_NUM: | |
957 | return put_user(sg_version_num, ip); | |
958 | case SG_GET_ACCESS_COUNT: | |
959 | /* faked - we don't have a real access count anymore */ | |
960 | val = (sdp->device ? 1 : 0); | |
961 | return put_user(val, ip); | |
962 | case SG_GET_REQUEST_TABLE: | |
963 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
964 | return -EFAULT; | |
965 | else { | |
cb59e840 DG |
966 | sg_req_info_t *rinfo; |
967 | unsigned int ms; | |
968 | ||
969 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
970 | GFP_KERNEL); | |
971 | if (!rinfo) | |
972 | return -ENOMEM; | |
1da177e4 LT |
973 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
974 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
975 | ++val, srp = srp ? srp->nextrp : srp) { | |
976 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
977 | if (srp) { | |
978 | rinfo[val].req_state = srp->done + 1; | |
979 | rinfo[val].problem = | |
980 | srp->header.masked_status & | |
981 | srp->header.host_status & | |
982 | srp->header.driver_status; | |
cb59e840 DG |
983 | if (srp->done) |
984 | rinfo[val].duration = | |
985 | srp->header.duration; | |
986 | else { | |
987 | ms = jiffies_to_msecs(jiffies); | |
988 | rinfo[val].duration = | |
989 | (ms > srp->header.duration) ? | |
990 | (ms - srp->header.duration) : 0; | |
991 | } | |
1da177e4 | 992 | rinfo[val].orphan = srp->orphan; |
cb59e840 DG |
993 | rinfo[val].sg_io_owned = |
994 | srp->sg_io_owned; | |
995 | rinfo[val].pack_id = | |
996 | srp->header.pack_id; | |
997 | rinfo[val].usr_ptr = | |
998 | srp->header.usr_ptr; | |
1da177e4 LT |
999 | } |
1000 | } | |
1001 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 DG |
1002 | result = __copy_to_user(p, rinfo, |
1003 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
1004 | result = result ? -EFAULT : 0; | |
1005 | kfree(rinfo); | |
1006 | return result; | |
1da177e4 LT |
1007 | } |
1008 | case SG_EMULATED_HOST: | |
1009 | if (sdp->detached) | |
1010 | return -ENODEV; | |
1011 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1012 | case SG_SCSI_RESET: | |
1013 | if (sdp->detached) | |
1014 | return -ENODEV; | |
1015 | if (filp->f_flags & O_NONBLOCK) { | |
939647ee | 1016 | if (scsi_host_in_recovery(sdp->device->host)) |
1da177e4 LT |
1017 | return -EBUSY; |
1018 | } else if (!scsi_block_when_processing_errors(sdp->device)) | |
1019 | return -EBUSY; | |
1020 | result = get_user(val, ip); | |
1021 | if (result) | |
1022 | return result; | |
1023 | if (SG_SCSI_RESET_NOTHING == val) | |
1024 | return 0; | |
1025 | switch (val) { | |
1026 | case SG_SCSI_RESET_DEVICE: | |
1027 | val = SCSI_TRY_RESET_DEVICE; | |
1028 | break; | |
1029 | case SG_SCSI_RESET_BUS: | |
1030 | val = SCSI_TRY_RESET_BUS; | |
1031 | break; | |
1032 | case SG_SCSI_RESET_HOST: | |
1033 | val = SCSI_TRY_RESET_HOST; | |
1034 | break; | |
1035 | default: | |
1036 | return -EINVAL; | |
1037 | } | |
1038 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1039 | return -EACCES; | |
1040 | return (scsi_reset_provider(sdp->device, val) == | |
1041 | SUCCESS) ? 0 : -EIO; | |
1042 | case SCSI_IOCTL_SEND_COMMAND: | |
1043 | if (sdp->detached) | |
1044 | return -ENODEV; | |
1045 | if (read_only) { | |
1046 | unsigned char opcode = WRITE_6; | |
1047 | Scsi_Ioctl_Command __user *siocp = p; | |
1048 | ||
1049 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1050 | return -EFAULT; | |
1051 | if (!sg_allow_access(opcode, sdp->device->type)) | |
1052 | return -EPERM; | |
1053 | } | |
21b2f0c8 | 1054 | return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p); |
1da177e4 LT |
1055 | case SG_SET_DEBUG: |
1056 | result = get_user(val, ip); | |
1057 | if (result) | |
1058 | return result; | |
1059 | sdp->sgdebug = (char) val; | |
1060 | return 0; | |
1061 | case SCSI_IOCTL_GET_IDLUN: | |
1062 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1063 | case SCSI_IOCTL_PROBE_HOST: | |
1064 | case SG_GET_TRANSFORM: | |
1065 | if (sdp->detached) | |
1066 | return -ENODEV; | |
1067 | return scsi_ioctl(sdp->device, cmd_in, p); | |
44ec9542 AS |
1068 | case BLKSECTGET: |
1069 | return put_user(sdp->device->request_queue->max_sectors * 512, | |
1070 | ip); | |
6da127ad CS |
1071 | case BLKTRACESETUP: |
1072 | return blk_trace_setup(sdp->device->request_queue, | |
1073 | sdp->disk->disk_name, | |
1074 | sdp->device->sdev_gendev.devt, | |
1075 | (char *)arg); | |
1076 | case BLKTRACESTART: | |
1077 | return blk_trace_startstop(sdp->device->request_queue, 1); | |
1078 | case BLKTRACESTOP: | |
1079 | return blk_trace_startstop(sdp->device->request_queue, 0); | |
1080 | case BLKTRACETEARDOWN: | |
1081 | return blk_trace_remove(sdp->device->request_queue); | |
1da177e4 LT |
1082 | default: |
1083 | if (read_only) | |
1084 | return -EPERM; /* don't know so take safe approach */ | |
1085 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | #ifdef CONFIG_COMPAT | |
1090 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1091 | { | |
1092 | Sg_device *sdp; | |
1093 | Sg_fd *sfp; | |
1094 | struct scsi_device *sdev; | |
1095 | ||
1096 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1097 | return -ENXIO; | |
1098 | ||
1099 | sdev = sdp->device; | |
1100 | if (sdev->host->hostt->compat_ioctl) { | |
1101 | int ret; | |
1102 | ||
1103 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1104 | ||
1105 | return ret; | |
1106 | } | |
1107 | ||
1108 | return -ENOIOCTLCMD; | |
1109 | } | |
1110 | #endif | |
1111 | ||
1112 | static unsigned int | |
1113 | sg_poll(struct file *filp, poll_table * wait) | |
1114 | { | |
1115 | unsigned int res = 0; | |
1116 | Sg_device *sdp; | |
1117 | Sg_fd *sfp; | |
1118 | Sg_request *srp; | |
1119 | int count = 0; | |
1120 | unsigned long iflags; | |
1121 | ||
1122 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) | |
1123 | || sfp->closed) | |
1124 | return POLLERR; | |
1125 | poll_wait(filp, &sfp->read_wait, wait); | |
1126 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1127 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1128 | /* if any read waiting, flag it */ | |
1129 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1130 | res = POLLIN | POLLRDNORM; | |
1131 | ++count; | |
1132 | } | |
1133 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1134 | ||
1135 | if (sdp->detached) | |
1136 | res |= POLLHUP; | |
1137 | else if (!sfp->cmd_q) { | |
1138 | if (0 == count) | |
1139 | res |= POLLOUT | POLLWRNORM; | |
1140 | } else if (count < SG_MAX_QUEUE) | |
1141 | res |= POLLOUT | POLLWRNORM; | |
1142 | SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", | |
1143 | sdp->disk->disk_name, (int) res)); | |
1144 | return res; | |
1145 | } | |
1146 | ||
1147 | static int | |
1148 | sg_fasync(int fd, struct file *filp, int mode) | |
1149 | { | |
1150 | int retval; | |
1151 | Sg_device *sdp; | |
1152 | Sg_fd *sfp; | |
1153 | ||
1154 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1155 | return -ENXIO; | |
1156 | SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", | |
1157 | sdp->disk->disk_name, mode)); | |
1158 | ||
1159 | retval = fasync_helper(fd, filp, mode, &sfp->async_qp); | |
1160 | return (retval < 0) ? retval : 0; | |
1161 | } | |
1162 | ||
a13ff0bb NP |
1163 | static int |
1164 | sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1da177e4 LT |
1165 | { |
1166 | Sg_fd *sfp; | |
d6b10348 | 1167 | unsigned long offset, len, sa; |
1da177e4 | 1168 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1169 | struct scatterlist *sg; |
1170 | int k; | |
1da177e4 LT |
1171 | |
1172 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
a13ff0bb | 1173 | return VM_FAULT_SIGBUS; |
1da177e4 | 1174 | rsv_schp = &sfp->reserve; |
a13ff0bb | 1175 | offset = vmf->pgoff << PAGE_SHIFT; |
1da177e4 | 1176 | if (offset >= rsv_schp->bufflen) |
a13ff0bb NP |
1177 | return VM_FAULT_SIGBUS; |
1178 | SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", | |
1da177e4 | 1179 | offset, rsv_schp->k_use_sg)); |
d6b10348 MC |
1180 | sg = rsv_schp->buffer; |
1181 | sa = vma->vm_start; | |
1182 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
b0f655d0 | 1183 | ++k, sg = sg_next(sg)) { |
d6b10348 MC |
1184 | len = vma->vm_end - sa; |
1185 | len = (len < sg->length) ? len : sg->length; | |
1186 | if (offset < len) { | |
a13ff0bb | 1187 | struct page *page; |
45711f1a | 1188 | page = virt_to_page(page_address(sg_page(sg)) + offset); |
d6b10348 | 1189 | get_page(page); /* increment page count */ |
a13ff0bb NP |
1190 | vmf->page = page; |
1191 | return 0; /* success */ | |
1da177e4 | 1192 | } |
d6b10348 MC |
1193 | sa += len; |
1194 | offset -= len; | |
1da177e4 | 1195 | } |
d6b10348 | 1196 | |
a13ff0bb | 1197 | return VM_FAULT_SIGBUS; |
1da177e4 LT |
1198 | } |
1199 | ||
1200 | static struct vm_operations_struct sg_mmap_vm_ops = { | |
a13ff0bb | 1201 | .fault = sg_vma_fault, |
1da177e4 LT |
1202 | }; |
1203 | ||
1204 | static int | |
1205 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1206 | { | |
1207 | Sg_fd *sfp; | |
d6b10348 | 1208 | unsigned long req_sz, len, sa; |
1da177e4 | 1209 | Sg_scatter_hold *rsv_schp; |
d6b10348 MC |
1210 | int k; |
1211 | struct scatterlist *sg; | |
1da177e4 LT |
1212 | |
1213 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1214 | return -ENXIO; | |
cb59e840 | 1215 | req_sz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
1216 | SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", |
1217 | (void *) vma->vm_start, (int) req_sz)); | |
1218 | if (vma->vm_pgoff) | |
1219 | return -EINVAL; /* want no offset */ | |
1220 | rsv_schp = &sfp->reserve; | |
1221 | if (req_sz > rsv_schp->bufflen) | |
1222 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1223 | ||
d6b10348 MC |
1224 | sa = vma->vm_start; |
1225 | sg = rsv_schp->buffer; | |
1226 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
b0f655d0 | 1227 | ++k, sg = sg_next(sg)) { |
d6b10348 MC |
1228 | len = vma->vm_end - sa; |
1229 | len = (len < sg->length) ? len : sg->length; | |
1230 | sa += len; | |
1da177e4 | 1231 | } |
d6b10348 | 1232 | |
f9aed0e2 | 1233 | sfp->mmap_called = 1; |
1c8e71d7 | 1234 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
1235 | vma->vm_private_data = sfp; |
1236 | vma->vm_ops = &sg_mmap_vm_ops; | |
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | /* This function is a "bottom half" handler that is called by the | |
1241 | * mid level when a command is completed (or has failed). */ | |
1242 | static void | |
d6b10348 | 1243 | sg_cmd_done(void *data, char *sense, int result, int resid) |
1da177e4 | 1244 | { |
d6b10348 | 1245 | Sg_request *srp = data; |
1da177e4 LT |
1246 | Sg_device *sdp = NULL; |
1247 | Sg_fd *sfp; | |
1da177e4 | 1248 | unsigned long iflags; |
cb59e840 | 1249 | unsigned int ms; |
1da177e4 | 1250 | |
1da177e4 LT |
1251 | if (NULL == srp) { |
1252 | printk(KERN_ERR "sg_cmd_done: NULL request\n"); | |
1da177e4 LT |
1253 | return; |
1254 | } | |
1255 | sfp = srp->parentfp; | |
1256 | if (sfp) | |
1257 | sdp = sfp->parentdp; | |
1258 | if ((NULL == sdp) || sdp->detached) { | |
1259 | printk(KERN_INFO "sg_cmd_done: device detached\n"); | |
1da177e4 LT |
1260 | return; |
1261 | } | |
1262 | ||
1da177e4 LT |
1263 | |
1264 | SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", | |
d6b10348 MC |
1265 | sdp->disk->disk_name, srp->header.pack_id, result)); |
1266 | srp->header.resid = resid; | |
cb59e840 DG |
1267 | ms = jiffies_to_msecs(jiffies); |
1268 | srp->header.duration = (ms > srp->header.duration) ? | |
1269 | (ms - srp->header.duration) : 0; | |
d6b10348 | 1270 | if (0 != result) { |
1da177e4 LT |
1271 | struct scsi_sense_hdr sshdr; |
1272 | ||
d6b10348 MC |
1273 | memcpy(srp->sense_b, sense, sizeof (srp->sense_b)); |
1274 | srp->header.status = 0xff & result; | |
1275 | srp->header.masked_status = status_byte(result); | |
1276 | srp->header.msg_status = msg_byte(result); | |
1277 | srp->header.host_status = host_byte(result); | |
1278 | srp->header.driver_status = driver_byte(result); | |
1da177e4 LT |
1279 | if ((sdp->sgdebug > 0) && |
1280 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1281 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
d6b10348 MC |
1282 | __scsi_print_sense("sg_cmd_done", sense, |
1283 | SCSI_SENSE_BUFFERSIZE); | |
1da177e4 LT |
1284 | |
1285 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
d6b10348 MC |
1286 | if (driver_byte(result) != 0 |
1287 | && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) | |
1da177e4 LT |
1288 | && !scsi_sense_is_deferred(&sshdr) |
1289 | && sshdr.sense_key == UNIT_ATTENTION | |
1290 | && sdp->device->removable) { | |
1291 | /* Detected possible disc change. Set the bit - this */ | |
1292 | /* may be used if there are filesystems using this device */ | |
1293 | sdp->device->changed = 1; | |
1294 | } | |
1295 | } | |
1296 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1297 | ||
1da177e4 LT |
1298 | if (sfp->closed) { /* whoops this fd already released, cleanup */ |
1299 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); | |
1300 | sg_finish_rem_req(srp); | |
1301 | srp = NULL; | |
1302 | if (NULL == sfp->headrp) { | |
7ca63cb4 | 1303 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n")); |
1da177e4 LT |
1304 | if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ |
1305 | scsi_device_put(sdp->device); | |
1306 | } | |
1307 | sfp = NULL; | |
1308 | } | |
1309 | } else if (srp && srp->orphan) { | |
1310 | if (sfp->keep_orphan) | |
1311 | srp->sg_io_owned = 0; | |
1312 | else { | |
1313 | sg_finish_rem_req(srp); | |
1314 | srp = NULL; | |
1315 | } | |
1316 | } | |
1317 | if (sfp && srp) { | |
1318 | /* Now wake up any sg_read() that is waiting for this packet. */ | |
1319 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); | |
1320 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1321 | srp->done = 1; | |
1322 | wake_up_interruptible(&sfp->read_wait); | |
1323 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1324 | } | |
1325 | } | |
1326 | ||
1327 | static struct file_operations sg_fops = { | |
1328 | .owner = THIS_MODULE, | |
1329 | .read = sg_read, | |
1330 | .write = sg_write, | |
1331 | .poll = sg_poll, | |
1332 | .ioctl = sg_ioctl, | |
1333 | #ifdef CONFIG_COMPAT | |
1334 | .compat_ioctl = sg_compat_ioctl, | |
1335 | #endif | |
1336 | .open = sg_open, | |
1337 | .mmap = sg_mmap, | |
1338 | .release = sg_release, | |
1339 | .fasync = sg_fasync, | |
1340 | }; | |
1341 | ||
d253878b | 1342 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1343 | |
1344 | static int sg_sysfs_valid = 0; | |
1345 | ||
7c07d613 | 1346 | static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) |
1da177e4 | 1347 | { |
d6b10348 | 1348 | struct request_queue *q = scsidp->request_queue; |
1da177e4 LT |
1349 | Sg_device *sdp; |
1350 | unsigned long iflags; | |
7c07d613 JB |
1351 | int error; |
1352 | u32 k; | |
1da177e4 | 1353 | |
24669f75 | 1354 | sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); |
1da177e4 LT |
1355 | if (!sdp) { |
1356 | printk(KERN_WARNING "kmalloc Sg_device failure\n"); | |
7c07d613 JB |
1357 | return ERR_PTR(-ENOMEM); |
1358 | } | |
1359 | error = -ENOMEM; | |
1360 | if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { | |
1361 | printk(KERN_WARNING "idr expansion Sg_device failure\n"); | |
1362 | goto out; | |
1da177e4 LT |
1363 | } |
1364 | ||
7c07d613 JB |
1365 | write_lock_irqsave(&sg_index_lock, iflags); |
1366 | error = idr_get_new(&sg_index_idr, sdp, &k); | |
1367 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 | 1368 | |
7c07d613 JB |
1369 | if (error) { |
1370 | printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", | |
1371 | error); | |
1372 | goto out; | |
1da177e4 LT |
1373 | } |
1374 | ||
1da177e4 LT |
1375 | if (unlikely(k >= SG_MAX_DEVS)) |
1376 | goto overflow; | |
1377 | ||
1da177e4 LT |
1378 | SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); |
1379 | sprintf(disk->disk_name, "sg%d", k); | |
1380 | disk->first_minor = k; | |
1381 | sdp->disk = disk; | |
1382 | sdp->device = scsidp; | |
1383 | init_waitqueue_head(&sdp->o_excl_wait); | |
d6b10348 | 1384 | sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments); |
7c07d613 | 1385 | sdp->index = k; |
1da177e4 | 1386 | |
7c07d613 | 1387 | error = 0; |
1da177e4 | 1388 | out: |
7c07d613 | 1389 | if (error) { |
1da177e4 | 1390 | kfree(sdp); |
7c07d613 JB |
1391 | return ERR_PTR(error); |
1392 | } | |
1393 | return sdp; | |
1da177e4 LT |
1394 | |
1395 | overflow: | |
9ccfc756 JB |
1396 | sdev_printk(KERN_WARNING, scsidp, |
1397 | "Unable to attach sg device type=%d, minor " | |
1398 | "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); | |
1da177e4 LT |
1399 | error = -ENODEV; |
1400 | goto out; | |
1401 | } | |
1402 | ||
1403 | static int | |
d8539d81 | 1404 | sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1405 | { |
1406 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
1407 | struct gendisk *disk; | |
1408 | Sg_device *sdp = NULL; | |
1409 | struct cdev * cdev = NULL; | |
7c07d613 | 1410 | int error; |
454e8957 | 1411 | unsigned long iflags; |
1da177e4 LT |
1412 | |
1413 | disk = alloc_disk(1); | |
1414 | if (!disk) { | |
1415 | printk(KERN_WARNING "alloc_disk failed\n"); | |
1416 | return -ENOMEM; | |
1417 | } | |
1418 | disk->major = SCSI_GENERIC_MAJOR; | |
1419 | ||
1420 | error = -ENOMEM; | |
1421 | cdev = cdev_alloc(); | |
1422 | if (!cdev) { | |
1423 | printk(KERN_WARNING "cdev_alloc failed\n"); | |
1424 | goto out; | |
1425 | } | |
1426 | cdev->owner = THIS_MODULE; | |
1427 | cdev->ops = &sg_fops; | |
1428 | ||
7c07d613 JB |
1429 | sdp = sg_alloc(disk, scsidp); |
1430 | if (IS_ERR(sdp)) { | |
1da177e4 | 1431 | printk(KERN_WARNING "sg_alloc failed\n"); |
7c07d613 | 1432 | error = PTR_ERR(sdp); |
1da177e4 LT |
1433 | goto out; |
1434 | } | |
1da177e4 | 1435 | |
7c07d613 | 1436 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); |
5e3c34c1 | 1437 | if (error) |
454e8957 | 1438 | goto cdev_add_err; |
5e3c34c1 | 1439 | |
1da177e4 LT |
1440 | sdp->cdev = cdev; |
1441 | if (sg_sysfs_valid) { | |
1442 | struct class_device * sg_class_member; | |
1443 | ||
53f46542 | 1444 | sg_class_member = class_device_create(sg_sysfs_class, NULL, |
7c07d613 JB |
1445 | MKDEV(SCSI_GENERIC_MAJOR, sdp->index), |
1446 | cl_dev->dev, "%s", | |
1da177e4 | 1447 | disk->disk_name); |
d07e0361 FT |
1448 | if (IS_ERR(sg_class_member)) { |
1449 | printk(KERN_ERR "sg_add: " | |
1450 | "class_device_create failed\n"); | |
1451 | error = PTR_ERR(sg_class_member); | |
1452 | goto cdev_add_err; | |
1453 | } | |
1da177e4 | 1454 | class_set_devdata(sg_class_member, sdp); |
d07e0361 | 1455 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, |
1da177e4 LT |
1456 | &sg_class_member->kobj, "generic"); |
1457 | if (error) | |
1458 | printk(KERN_ERR "sg_add: unable to make symlink " | |
7c07d613 | 1459 | "'generic' back to sg%d\n", sdp->index); |
1da177e4 | 1460 | } else |
7c07d613 | 1461 | printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); |
1da177e4 | 1462 | |
9ccfc756 | 1463 | sdev_printk(KERN_NOTICE, scsidp, |
7c07d613 JB |
1464 | "Attached scsi generic sg%d type %d\n", sdp->index, |
1465 | scsidp->type); | |
1da177e4 | 1466 | |
a24484f2 FT |
1467 | class_set_devdata(cl_dev, sdp); |
1468 | ||
1da177e4 LT |
1469 | return 0; |
1470 | ||
454e8957 | 1471 | cdev_add_err: |
7c07d613 JB |
1472 | write_lock_irqsave(&sg_index_lock, iflags); |
1473 | idr_remove(&sg_index_idr, sdp->index); | |
1474 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1475 | kfree(sdp); | |
454e8957 | 1476 | |
1da177e4 LT |
1477 | out: |
1478 | put_disk(disk); | |
1479 | if (cdev) | |
1480 | cdev_del(cdev); | |
1481 | return error; | |
1482 | } | |
1483 | ||
1484 | static void | |
d8539d81 | 1485 | sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1486 | { |
1487 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
7c07d613 | 1488 | Sg_device *sdp = class_get_devdata(cl_dev); |
1da177e4 LT |
1489 | unsigned long iflags; |
1490 | Sg_fd *sfp; | |
1491 | Sg_fd *tsfp; | |
1492 | Sg_request *srp; | |
1493 | Sg_request *tsrp; | |
7c07d613 | 1494 | int delay; |
1da177e4 | 1495 | |
7c07d613 | 1496 | if (!sdp) |
1da177e4 | 1497 | return; |
7c07d613 | 1498 | |
1da177e4 | 1499 | delay = 0; |
7c07d613 JB |
1500 | write_lock_irqsave(&sg_index_lock, iflags); |
1501 | if (sdp->headfp) { | |
1502 | sdp->detached = 1; | |
1503 | for (sfp = sdp->headfp; sfp; sfp = tsfp) { | |
1504 | tsfp = sfp->nextfp; | |
1505 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
1506 | tsrp = srp->nextrp; | |
1507 | if (sfp->closed || (0 == sg_srp_done(srp, sfp))) | |
1508 | sg_finish_rem_req(srp); | |
1da177e4 | 1509 | } |
7c07d613 JB |
1510 | if (sfp->closed) { |
1511 | scsi_device_put(sdp->device); | |
1512 | __sg_remove_sfp(sdp, sfp); | |
1513 | } else { | |
1514 | delay = 1; | |
1515 | wake_up_interruptible(&sfp->read_wait); | |
1516 | kill_fasync(&sfp->async_qp, SIGPOLL, | |
1517 | POLL_HUP); | |
1da177e4 | 1518 | } |
1da177e4 | 1519 | } |
7c07d613 JB |
1520 | SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", sdp->index)); |
1521 | if (NULL == sdp->headfp) { | |
1522 | idr_remove(&sg_index_idr, sdp->index); | |
1523 | } | |
1524 | } else { /* nothing active, simple case */ | |
1525 | SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", sdp->index)); | |
1526 | idr_remove(&sg_index_idr, sdp->index); | |
1527 | } | |
1528 | write_unlock_irqrestore(&sg_index_lock, iflags); | |
1529 | ||
1530 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
1531 | class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); | |
1532 | cdev_del(sdp->cdev); | |
1533 | sdp->cdev = NULL; | |
1534 | put_disk(sdp->disk); | |
1535 | sdp->disk = NULL; | |
1536 | if (NULL == sdp->headfp) | |
1537 | kfree(sdp); | |
1da177e4 LT |
1538 | |
1539 | if (delay) | |
1540 | msleep(10); /* dirty detach so delay device destruction */ | |
1541 | } | |
1542 | ||
6460e75a DG |
1543 | module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); |
1544 | module_param_named(def_reserved_size, def_reserved_size, int, | |
1545 | S_IRUGO | S_IWUSR); | |
1da177e4 LT |
1546 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); |
1547 | ||
1548 | MODULE_AUTHOR("Douglas Gilbert"); | |
1549 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1550 | MODULE_LICENSE("GPL"); | |
1551 | MODULE_VERSION(SG_VERSION_STR); | |
f018fa55 | 1552 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |
1da177e4 | 1553 | |
6460e75a DG |
1554 | MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " |
1555 | "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); | |
1da177e4 LT |
1556 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); |
1557 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1558 | ||
1559 | static int __init | |
1560 | init_sg(void) | |
1561 | { | |
1562 | int rc; | |
1563 | ||
6460e75a DG |
1564 | if (scatter_elem_sz < PAGE_SIZE) { |
1565 | scatter_elem_sz = PAGE_SIZE; | |
1566 | scatter_elem_sz_prev = scatter_elem_sz; | |
1567 | } | |
1da177e4 LT |
1568 | if (def_reserved_size >= 0) |
1569 | sg_big_buff = def_reserved_size; | |
6460e75a DG |
1570 | else |
1571 | def_reserved_size = sg_big_buff; | |
1da177e4 LT |
1572 | |
1573 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1574 | SG_MAX_DEVS, "sg"); | |
1575 | if (rc) | |
1576 | return rc; | |
d253878b | 1577 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1578 | if ( IS_ERR(sg_sysfs_class) ) { |
1579 | rc = PTR_ERR(sg_sysfs_class); | |
1580 | goto err_out; | |
1581 | } | |
1582 | sg_sysfs_valid = 1; | |
1583 | rc = scsi_register_interface(&sg_interface); | |
1584 | if (0 == rc) { | |
1585 | #ifdef CONFIG_SCSI_PROC_FS | |
1586 | sg_proc_init(); | |
1587 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1588 | return 0; | |
1589 | } | |
d253878b | 1590 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1591 | err_out: |
1592 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1593 | return rc; | |
1594 | } | |
1595 | ||
1596 | static void __exit | |
1597 | exit_sg(void) | |
1598 | { | |
1599 | #ifdef CONFIG_SCSI_PROC_FS | |
1600 | sg_proc_cleanup(); | |
1601 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1602 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1603 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1604 | sg_sysfs_valid = 0; |
1605 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1606 | SG_MAX_DEVS); | |
7c07d613 | 1607 | idr_destroy(&sg_index_idr); |
1da177e4 LT |
1608 | } |
1609 | ||
1610 | static int | |
1611 | sg_start_req(Sg_request * srp) | |
1612 | { | |
1613 | int res; | |
1614 | Sg_fd *sfp = srp->parentfp; | |
1615 | sg_io_hdr_t *hp = &srp->header; | |
1616 | int dxfer_len = (int) hp->dxfer_len; | |
1617 | int dxfer_dir = hp->dxfer_direction; | |
1618 | Sg_scatter_hold *req_schp = &srp->data; | |
1619 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1620 | ||
1621 | SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); | |
1622 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) | |
1623 | return 0; | |
1624 | if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && | |
1625 | (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && | |
1626 | (!sfp->parentdp->device->host->unchecked_isa_dma)) { | |
1627 | res = sg_build_direct(srp, sfp, dxfer_len); | |
1628 | if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ | |
1629 | return res; | |
1630 | } | |
1631 | if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) | |
1632 | sg_link_reserve(sfp, srp, dxfer_len); | |
1633 | else { | |
1634 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1635 | if (res) { | |
1636 | sg_remove_scat(req_schp); | |
1637 | return res; | |
1638 | } | |
1639 | } | |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | static void | |
1644 | sg_finish_rem_req(Sg_request * srp) | |
1645 | { | |
1646 | Sg_fd *sfp = srp->parentfp; | |
1647 | Sg_scatter_hold *req_schp = &srp->data; | |
1648 | ||
1649 | SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); | |
1650 | if (srp->res_used) | |
1651 | sg_unlink_reserve(sfp, srp); | |
1652 | else | |
1653 | sg_remove_scat(req_schp); | |
1654 | sg_remove_request(sfp, srp); | |
1655 | } | |
1656 | ||
1657 | static int | |
1658 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1659 | { | |
d6b10348 | 1660 | int sg_bufflen = tablesize * sizeof(struct scatterlist); |
2d20eaf9 | 1661 | gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; |
1da177e4 | 1662 | |
d6b10348 MC |
1663 | /* |
1664 | * TODO: test without low_dma, we should not need it since | |
1665 | * the block layer will bounce the buffer for us | |
1666 | * | |
1667 | * XXX(hch): we shouldn't need GFP_DMA for the actual S/G list. | |
1668 | */ | |
1669 | if (sfp->low_dma) | |
1670 | gfp_flags |= GFP_DMA; | |
1671 | schp->buffer = kzalloc(sg_bufflen, gfp_flags); | |
1da177e4 LT |
1672 | if (!schp->buffer) |
1673 | return -ENOMEM; | |
30fa0d0f | 1674 | sg_init_table(schp->buffer, tablesize); |
1da177e4 | 1675 | schp->sglist_len = sg_bufflen; |
d6b10348 | 1676 | return tablesize; /* number of scat_gath elements allocated */ |
1da177e4 LT |
1677 | } |
1678 | ||
1679 | #ifdef SG_ALLOW_DIO_CODE | |
1680 | /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ | |
d6b10348 | 1681 | /* TODO: hopefully we can use the generic block layer code */ |
1da177e4 LT |
1682 | |
1683 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
1684 | - mapping of all pages not successful | |
1da177e4 LT |
1685 | (i.e., either completely successful or fails) |
1686 | */ | |
1687 | static int | |
1688 | st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
d6b10348 | 1689 | unsigned long uaddr, size_t count, int rw) |
1da177e4 | 1690 | { |
deb92b7e DG |
1691 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1692 | unsigned long start = uaddr >> PAGE_SHIFT; | |
1693 | const int nr_pages = end - start; | |
1da177e4 | 1694 | int res, i, j; |
1da177e4 LT |
1695 | struct page **pages; |
1696 | ||
1da177e4 LT |
1697 | /* User attempted Overflow! */ |
1698 | if ((uaddr + count) < uaddr) | |
1699 | return -EINVAL; | |
1700 | ||
1701 | /* Too big */ | |
1702 | if (nr_pages > max_pages) | |
1703 | return -ENOMEM; | |
1704 | ||
1705 | /* Hmm? */ | |
1706 | if (count == 0) | |
1707 | return 0; | |
1708 | ||
1709 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) | |
1710 | return -ENOMEM; | |
1711 | ||
1712 | /* Try to fault in all of the necessary pages */ | |
1713 | down_read(¤t->mm->mmap_sem); | |
1714 | /* rw==READ means read from drive, write into memory area */ | |
1715 | res = get_user_pages( | |
1716 | current, | |
1717 | current->mm, | |
1718 | uaddr, | |
1719 | nr_pages, | |
1720 | rw == READ, | |
1721 | 0, /* don't force */ | |
1722 | pages, | |
1723 | NULL); | |
1724 | up_read(¤t->mm->mmap_sem); | |
1725 | ||
1726 | /* Errors and no page mapped should return here */ | |
1727 | if (res < nr_pages) | |
1728 | goto out_unmap; | |
1729 | ||
1730 | for (i=0; i < nr_pages; i++) { | |
1731 | /* FIXME: flush superflous for rw==READ, | |
1732 | * probably wrong function for rw==WRITE | |
1733 | */ | |
1734 | flush_dcache_page(pages[i]); | |
1da177e4 LT |
1735 | /* ?? Is locking needed? I don't think so */ |
1736 | /* if (TestSetPageLocked(pages[i])) | |
1737 | goto out_unlock; */ | |
1738 | } | |
1739 | ||
642f1490 | 1740 | sg_set_page(sgl, pages[0], 0, uaddr & ~PAGE_MASK); |
1da177e4 LT |
1741 | if (nr_pages > 1) { |
1742 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
1743 | count -= sgl[0].length; | |
642f1490 JA |
1744 | for (i=1; i < nr_pages ; i++) |
1745 | sg_set_page(&sgl[i], pages[i], count < PAGE_SIZE ? count : PAGE_SIZE, 0); | |
1da177e4 LT |
1746 | } |
1747 | else { | |
1748 | sgl[0].length = count; | |
1749 | } | |
1750 | ||
1751 | kfree(pages); | |
1752 | return nr_pages; | |
1753 | ||
1da177e4 | 1754 | out_unmap: |
4d5cda06 | 1755 | if (res > 0) { |
1da177e4 LT |
1756 | for (j=0; j < res; j++) |
1757 | page_cache_release(pages[j]); | |
4d5cda06 HD |
1758 | res = 0; |
1759 | } | |
1da177e4 LT |
1760 | kfree(pages); |
1761 | return res; | |
1762 | } | |
1763 | ||
1764 | ||
1765 | /* And unmap them... */ | |
1766 | static int | |
1767 | st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
1768 | int dirtied) | |
1769 | { | |
1770 | int i; | |
1771 | ||
1772 | for (i=0; i < nr_pages; i++) { | |
45711f1a | 1773 | struct page *page = sg_page(&sgl[i]); |
b5810039 | 1774 | |
b5810039 NP |
1775 | if (dirtied) |
1776 | SetPageDirty(page); | |
1777 | /* unlock_page(page); */ | |
1da177e4 LT |
1778 | /* FIXME: cache flush missing for rw==READ |
1779 | * FIXME: call the correct reference counting function | |
1780 | */ | |
b5810039 | 1781 | page_cache_release(page); |
1da177e4 LT |
1782 | } |
1783 | ||
1784 | return 0; | |
1785 | } | |
1786 | ||
1787 | /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ | |
1788 | #endif | |
1789 | ||
1790 | ||
1791 | /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ | |
1792 | static int | |
1793 | sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) | |
1794 | { | |
1795 | #ifdef SG_ALLOW_DIO_CODE | |
1796 | sg_io_hdr_t *hp = &srp->header; | |
1797 | Sg_scatter_hold *schp = &srp->data; | |
1798 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 LT |
1799 | int mx_sc_elems, res; |
1800 | struct scsi_device *sdev = sfp->parentdp->device; | |
1801 | ||
1802 | if (((unsigned long)hp->dxferp & | |
1803 | queue_dma_alignment(sdev->request_queue)) != 0) | |
1804 | return 1; | |
d6b10348 | 1805 | |
1da177e4 LT |
1806 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); |
1807 | if (mx_sc_elems <= 0) { | |
1808 | return 1; | |
1809 | } | |
d6b10348 MC |
1810 | res = st_map_user_pages(schp->buffer, mx_sc_elems, |
1811 | (unsigned long)hp->dxferp, dxfer_len, | |
1812 | (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0); | |
c06bb7f5 DG |
1813 | if (res <= 0) { |
1814 | sg_remove_scat(schp); | |
1da177e4 | 1815 | return 1; |
c06bb7f5 | 1816 | } |
1da177e4 LT |
1817 | schp->k_use_sg = res; |
1818 | schp->dio_in_use = 1; | |
1819 | hp->info |= SG_INFO_DIRECT_IO; | |
1820 | return 0; | |
1821 | #else | |
1822 | return 1; | |
1823 | #endif | |
1824 | } | |
1825 | ||
1826 | static int | |
1827 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1828 | { | |
d6b10348 MC |
1829 | struct scatterlist *sg; |
1830 | int ret_sz = 0, k, rem_sz, num, mx_sc_elems; | |
1831 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1da177e4 | 1832 | int blk_size = buff_size; |
d6b10348 | 1833 | struct page *p = NULL; |
1da177e4 | 1834 | |
fb119935 | 1835 | if (blk_size < 0) |
1da177e4 LT |
1836 | return -EFAULT; |
1837 | if (0 == blk_size) | |
1838 | ++blk_size; /* don't know why */ | |
1839 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ | |
1840 | blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); | |
1841 | SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1842 | buff_size, blk_size)); | |
d6b10348 MC |
1843 | |
1844 | /* N.B. ret_sz carried into this block ... */ | |
1845 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1846 | if (mx_sc_elems < 0) | |
1847 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1848 | ||
6460e75a DG |
1849 | num = scatter_elem_sz; |
1850 | if (unlikely(num != scatter_elem_sz_prev)) { | |
1851 | if (num < PAGE_SIZE) { | |
1852 | scatter_elem_sz = PAGE_SIZE; | |
1853 | scatter_elem_sz_prev = PAGE_SIZE; | |
1854 | } else | |
1855 | scatter_elem_sz_prev = num; | |
1856 | } | |
d6b10348 MC |
1857 | for (k = 0, sg = schp->buffer, rem_sz = blk_size; |
1858 | (rem_sz > 0) && (k < mx_sc_elems); | |
b0f655d0 | 1859 | ++k, rem_sz -= ret_sz, sg = sg_next(sg)) { |
d6b10348 | 1860 | |
6460e75a DG |
1861 | num = (rem_sz > scatter_elem_sz_prev) ? |
1862 | scatter_elem_sz_prev : rem_sz; | |
d6b10348 | 1863 | p = sg_page_malloc(num, sfp->low_dma, &ret_sz); |
1da177e4 LT |
1864 | if (!p) |
1865 | return -ENOMEM; | |
d6b10348 | 1866 | |
6460e75a DG |
1867 | if (num == scatter_elem_sz_prev) { |
1868 | if (unlikely(ret_sz > scatter_elem_sz_prev)) { | |
1869 | scatter_elem_sz = ret_sz; | |
1870 | scatter_elem_sz_prev = ret_sz; | |
1871 | } | |
1872 | } | |
642f1490 | 1873 | sg_set_page(sg, p, (ret_sz > num) ? num : ret_sz, 0); |
d6b10348 | 1874 | |
7ca63cb4 DG |
1875 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " |
1876 | "ret_sz=%d\n", k, num, ret_sz)); | |
d6b10348 MC |
1877 | } /* end of for loop */ |
1878 | ||
1879 | schp->k_use_sg = k; | |
7ca63cb4 DG |
1880 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " |
1881 | "rem_sz=%d\n", k, rem_sz)); | |
d6b10348 MC |
1882 | |
1883 | schp->bufflen = blk_size; | |
1884 | if (rem_sz > 0) /* must have failed */ | |
1885 | return -ENOMEM; | |
1886 | ||
1da177e4 LT |
1887 | return 0; |
1888 | } | |
1889 | ||
1890 | static int | |
1891 | sg_write_xfer(Sg_request * srp) | |
1892 | { | |
1893 | sg_io_hdr_t *hp = &srp->header; | |
1894 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 1895 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
1896 | int num_xfer = 0; |
1897 | int j, k, onum, usglen, ksglen, res; | |
1898 | int iovec_count = (int) hp->iovec_count; | |
1899 | int dxfer_dir = hp->dxfer_direction; | |
1900 | unsigned char *p; | |
1901 | unsigned char __user *up; | |
1902 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
1903 | ||
1904 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || | |
1905 | (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
1906 | num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); | |
1907 | if (schp->bufflen < num_xfer) | |
1908 | num_xfer = schp->bufflen; | |
1909 | } | |
1910 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
1911 | (new_interface | |
1912 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
1913 | return 0; | |
1914 | ||
1915 | SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
1916 | num_xfer, iovec_count, schp->k_use_sg)); | |
1917 | if (iovec_count) { | |
1918 | onum = iovec_count; | |
1919 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
1920 | return -EFAULT; | |
1921 | } else | |
1922 | onum = 1; | |
1923 | ||
d6b10348 | 1924 | ksglen = sg->length; |
45711f1a | 1925 | p = page_address(sg_page(sg)); |
d6b10348 MC |
1926 | for (j = 0, k = 0; j < onum; ++j) { |
1927 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
1928 | if (res) | |
1929 | return res; | |
1930 | ||
b0f655d0 | 1931 | for (; p; sg = sg_next(sg), ksglen = sg->length, |
45711f1a | 1932 | p = page_address(sg_page(sg))) { |
d6b10348 MC |
1933 | if (usglen <= 0) |
1934 | break; | |
1935 | if (ksglen > usglen) { | |
1936 | if (usglen >= num_xfer) { | |
1937 | if (__copy_from_user(p, up, num_xfer)) | |
1da177e4 | 1938 | return -EFAULT; |
d6b10348 | 1939 | return 0; |
1da177e4 | 1940 | } |
d6b10348 MC |
1941 | if (__copy_from_user(p, up, usglen)) |
1942 | return -EFAULT; | |
1943 | p += usglen; | |
1944 | ksglen -= usglen; | |
1945 | break; | |
1946 | } else { | |
1947 | if (ksglen >= num_xfer) { | |
1948 | if (__copy_from_user(p, up, num_xfer)) | |
1949 | return -EFAULT; | |
1da177e4 | 1950 | return 0; |
d6b10348 MC |
1951 | } |
1952 | if (__copy_from_user(p, up, ksglen)) | |
1953 | return -EFAULT; | |
1954 | up += ksglen; | |
1955 | usglen -= ksglen; | |
1da177e4 | 1956 | } |
d6b10348 MC |
1957 | ++k; |
1958 | if (k >= schp->k_use_sg) | |
1959 | return 0; | |
1da177e4 LT |
1960 | } |
1961 | } | |
d6b10348 | 1962 | |
1da177e4 LT |
1963 | return 0; |
1964 | } | |
1965 | ||
1966 | static int | |
1967 | sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
1968 | int wr_xf, int *countp, unsigned char __user **up) | |
1969 | { | |
1970 | int num_xfer = (int) hp->dxfer_len; | |
1971 | unsigned char __user *p = hp->dxferp; | |
1972 | int count; | |
1973 | ||
1974 | if (0 == sg_num) { | |
1975 | if (wr_xf && ('\0' == hp->interface_id)) | |
1976 | count = (int) hp->flags; /* holds "old" input_size */ | |
1977 | else | |
1978 | count = num_xfer; | |
1979 | } else { | |
1980 | sg_iovec_t iovec; | |
1981 | if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) | |
1982 | return -EFAULT; | |
1983 | p = iovec.iov_base; | |
1984 | count = (int) iovec.iov_len; | |
1985 | } | |
1986 | if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) | |
1987 | return -EFAULT; | |
1988 | if (up) | |
1989 | *up = p; | |
1990 | if (countp) | |
1991 | *countp = count; | |
1992 | return 0; | |
1993 | } | |
1994 | ||
1995 | static void | |
1996 | sg_remove_scat(Sg_scatter_hold * schp) | |
1997 | { | |
1998 | SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
1999 | if (schp->buffer && (schp->sglist_len > 0)) { | |
d6b10348 | 2000 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2001 | |
2002 | if (schp->dio_in_use) { | |
2003 | #ifdef SG_ALLOW_DIO_CODE | |
d6b10348 | 2004 | st_unmap_user_pages(sg, schp->k_use_sg, TRUE); |
1da177e4 LT |
2005 | #endif |
2006 | } else { | |
2007 | int k; | |
2008 | ||
45711f1a | 2009 | for (k = 0; (k < schp->k_use_sg) && sg_page(sg); |
b0f655d0 | 2010 | ++k, sg = sg_next(sg)) { |
1da177e4 | 2011 | SCSI_LOG_TIMEOUT(5, printk( |
7ca63cb4 | 2012 | "sg_remove_scat: k=%d, pg=0x%p, len=%d\n", |
45711f1a JA |
2013 | k, sg_page(sg), sg->length)); |
2014 | sg_page_free(sg_page(sg), sg->length); | |
1da177e4 LT |
2015 | } |
2016 | } | |
d6b10348 MC |
2017 | kfree(schp->buffer); |
2018 | } | |
1da177e4 LT |
2019 | memset(schp, 0, sizeof (*schp)); |
2020 | } | |
2021 | ||
2022 | static int | |
2023 | sg_read_xfer(Sg_request * srp) | |
2024 | { | |
2025 | sg_io_hdr_t *hp = &srp->header; | |
2026 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 | 2027 | struct scatterlist *sg = schp->buffer; |
1da177e4 LT |
2028 | int num_xfer = 0; |
2029 | int j, k, onum, usglen, ksglen, res; | |
2030 | int iovec_count = (int) hp->iovec_count; | |
2031 | int dxfer_dir = hp->dxfer_direction; | |
2032 | unsigned char *p; | |
2033 | unsigned char __user *up; | |
2034 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2035 | ||
2036 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) | |
2037 | || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2038 | num_xfer = hp->dxfer_len; | |
2039 | if (schp->bufflen < num_xfer) | |
2040 | num_xfer = schp->bufflen; | |
2041 | } | |
2042 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2043 | (new_interface | |
2044 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2045 | return 0; | |
2046 | ||
2047 | SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2048 | num_xfer, iovec_count, schp->k_use_sg)); | |
2049 | if (iovec_count) { | |
2050 | onum = iovec_count; | |
2051 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2052 | return -EFAULT; | |
2053 | } else | |
2054 | onum = 1; | |
2055 | ||
45711f1a | 2056 | p = page_address(sg_page(sg)); |
d6b10348 MC |
2057 | ksglen = sg->length; |
2058 | for (j = 0, k = 0; j < onum; ++j) { | |
2059 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2060 | if (res) | |
2061 | return res; | |
2062 | ||
b0f655d0 | 2063 | for (; p; sg = sg_next(sg), ksglen = sg->length, |
45711f1a | 2064 | p = page_address(sg_page(sg))) { |
d6b10348 MC |
2065 | if (usglen <= 0) |
2066 | break; | |
2067 | if (ksglen > usglen) { | |
2068 | if (usglen >= num_xfer) { | |
2069 | if (__copy_to_user(up, p, num_xfer)) | |
1da177e4 | 2070 | return -EFAULT; |
d6b10348 | 2071 | return 0; |
1da177e4 | 2072 | } |
d6b10348 MC |
2073 | if (__copy_to_user(up, p, usglen)) |
2074 | return -EFAULT; | |
2075 | p += usglen; | |
2076 | ksglen -= usglen; | |
2077 | break; | |
2078 | } else { | |
2079 | if (ksglen >= num_xfer) { | |
2080 | if (__copy_to_user(up, p, num_xfer)) | |
2081 | return -EFAULT; | |
1da177e4 | 2082 | return 0; |
d6b10348 MC |
2083 | } |
2084 | if (__copy_to_user(up, p, ksglen)) | |
2085 | return -EFAULT; | |
2086 | up += ksglen; | |
2087 | usglen -= ksglen; | |
1da177e4 | 2088 | } |
d6b10348 MC |
2089 | ++k; |
2090 | if (k >= schp->k_use_sg) | |
2091 | return 0; | |
1da177e4 LT |
2092 | } |
2093 | } | |
d6b10348 | 2094 | |
1da177e4 LT |
2095 | return 0; |
2096 | } | |
2097 | ||
2098 | static int | |
2099 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
2100 | { | |
2101 | Sg_scatter_hold *schp = &srp->data; | |
d6b10348 MC |
2102 | struct scatterlist *sg = schp->buffer; |
2103 | int k, num; | |
1da177e4 LT |
2104 | |
2105 | SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", | |
2106 | num_read_xfer)); | |
2107 | if ((!outp) || (num_read_xfer <= 0)) | |
2108 | return 0; | |
d6b10348 | 2109 | |
45711f1a | 2110 | for (k = 0; (k < schp->k_use_sg) && sg_page(sg); ++k, sg = sg_next(sg)) { |
d6b10348 MC |
2111 | num = sg->length; |
2112 | if (num > num_read_xfer) { | |
45711f1a | 2113 | if (__copy_to_user(outp, page_address(sg_page(sg)), |
d6b10348 MC |
2114 | num_read_xfer)) |
2115 | return -EFAULT; | |
2116 | break; | |
2117 | } else { | |
45711f1a | 2118 | if (__copy_to_user(outp, page_address(sg_page(sg)), |
d6b10348 MC |
2119 | num)) |
2120 | return -EFAULT; | |
2121 | num_read_xfer -= num; | |
2122 | if (num_read_xfer <= 0) | |
1da177e4 | 2123 | break; |
d6b10348 | 2124 | outp += num; |
1da177e4 | 2125 | } |
1da177e4 | 2126 | } |
d6b10348 | 2127 | |
1da177e4 LT |
2128 | return 0; |
2129 | } | |
2130 | ||
2131 | static void | |
2132 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2133 | { | |
2134 | Sg_scatter_hold *schp = &sfp->reserve; | |
2135 | ||
2136 | SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); | |
2137 | do { | |
2138 | if (req_size < PAGE_SIZE) | |
2139 | req_size = PAGE_SIZE; | |
2140 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2141 | return; | |
2142 | else | |
2143 | sg_remove_scat(schp); | |
2144 | req_size >>= 1; /* divide by 2 */ | |
2145 | } while (req_size > (PAGE_SIZE / 2)); | |
2146 | } | |
2147 | ||
2148 | static void | |
2149 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2150 | { | |
2151 | Sg_scatter_hold *req_schp = &srp->data; | |
2152 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
d6b10348 MC |
2153 | struct scatterlist *sg = rsv_schp->buffer; |
2154 | int k, num, rem; | |
1da177e4 LT |
2155 | |
2156 | srp->res_used = 1; | |
2157 | SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); | |
eca7be5e | 2158 | rem = size; |
d6b10348 | 2159 | |
b0f655d0 | 2160 | for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) { |
d6b10348 MC |
2161 | num = sg->length; |
2162 | if (rem <= num) { | |
2163 | sfp->save_scat_len = num; | |
2164 | sg->length = rem; | |
2165 | req_schp->k_use_sg = k + 1; | |
2166 | req_schp->sglist_len = rsv_schp->sglist_len; | |
2167 | req_schp->buffer = rsv_schp->buffer; | |
2168 | ||
2169 | req_schp->bufflen = size; | |
2170 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2171 | break; | |
2172 | } else | |
2173 | rem -= num; | |
1da177e4 | 2174 | } |
d6b10348 MC |
2175 | |
2176 | if (k >= rsv_schp->k_use_sg) | |
2177 | SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); | |
1da177e4 LT |
2178 | } |
2179 | ||
2180 | static void | |
2181 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2182 | { | |
2183 | Sg_scatter_hold *req_schp = &srp->data; | |
2184 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2185 | ||
2186 | SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", | |
2187 | (int) req_schp->k_use_sg)); | |
2188 | if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { | |
d6b10348 | 2189 | struct scatterlist *sg = rsv_schp->buffer; |
1da177e4 LT |
2190 | |
2191 | if (sfp->save_scat_len > 0) | |
d6b10348 | 2192 | (sg + (req_schp->k_use_sg - 1))->length = |
1da177e4 LT |
2193 | (unsigned) sfp->save_scat_len; |
2194 | else | |
2195 | SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); | |
2196 | } | |
2197 | req_schp->k_use_sg = 0; | |
2198 | req_schp->bufflen = 0; | |
2199 | req_schp->buffer = NULL; | |
2200 | req_schp->sglist_len = 0; | |
2201 | sfp->save_scat_len = 0; | |
2202 | srp->res_used = 0; | |
2203 | } | |
2204 | ||
2205 | static Sg_request * | |
2206 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2207 | { | |
2208 | Sg_request *resp; | |
2209 | unsigned long iflags; | |
2210 | ||
2211 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2212 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2213 | /* look for requests that are ready + not SG_IO owned */ | |
2214 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2215 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2216 | resp->done = 2; /* guard against other readers */ | |
2217 | break; | |
2218 | } | |
2219 | } | |
2220 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2221 | return resp; | |
2222 | } | |
2223 | ||
2224 | #ifdef CONFIG_SCSI_PROC_FS | |
2225 | static Sg_request * | |
2226 | sg_get_nth_request(Sg_fd * sfp, int nth) | |
2227 | { | |
2228 | Sg_request *resp; | |
2229 | unsigned long iflags; | |
2230 | int k; | |
2231 | ||
2232 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2233 | for (k = 0, resp = sfp->headrp; resp && (k < nth); | |
2234 | ++k, resp = resp->nextrp) ; | |
2235 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2236 | return resp; | |
2237 | } | |
2238 | #endif | |
2239 | ||
2240 | /* always adds to end of list */ | |
2241 | static Sg_request * | |
2242 | sg_add_request(Sg_fd * sfp) | |
2243 | { | |
2244 | int k; | |
2245 | unsigned long iflags; | |
2246 | Sg_request *resp; | |
2247 | Sg_request *rp = sfp->req_arr; | |
2248 | ||
2249 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2250 | resp = sfp->headrp; | |
2251 | if (!resp) { | |
2252 | memset(rp, 0, sizeof (Sg_request)); | |
2253 | rp->parentfp = sfp; | |
2254 | resp = rp; | |
2255 | sfp->headrp = resp; | |
2256 | } else { | |
2257 | if (0 == sfp->cmd_q) | |
2258 | resp = NULL; /* command queuing disallowed */ | |
2259 | else { | |
2260 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2261 | if (!rp->parentfp) | |
2262 | break; | |
2263 | } | |
2264 | if (k < SG_MAX_QUEUE) { | |
2265 | memset(rp, 0, sizeof (Sg_request)); | |
2266 | rp->parentfp = sfp; | |
2267 | while (resp->nextrp) | |
2268 | resp = resp->nextrp; | |
2269 | resp->nextrp = rp; | |
2270 | resp = rp; | |
2271 | } else | |
2272 | resp = NULL; | |
2273 | } | |
2274 | } | |
2275 | if (resp) { | |
2276 | resp->nextrp = NULL; | |
cb59e840 | 2277 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
2278 | } |
2279 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2280 | return resp; | |
2281 | } | |
2282 | ||
2283 | /* Return of 1 for found; 0 for not found */ | |
2284 | static int | |
2285 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2286 | { | |
2287 | Sg_request *prev_rp; | |
2288 | Sg_request *rp; | |
2289 | unsigned long iflags; | |
2290 | int res = 0; | |
2291 | ||
2292 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2293 | return res; | |
2294 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2295 | prev_rp = sfp->headrp; | |
2296 | if (srp == prev_rp) { | |
2297 | sfp->headrp = prev_rp->nextrp; | |
2298 | prev_rp->parentfp = NULL; | |
2299 | res = 1; | |
2300 | } else { | |
2301 | while ((rp = prev_rp->nextrp)) { | |
2302 | if (srp == rp) { | |
2303 | prev_rp->nextrp = rp->nextrp; | |
2304 | rp->parentfp = NULL; | |
2305 | res = 1; | |
2306 | break; | |
2307 | } | |
2308 | prev_rp = rp; | |
2309 | } | |
2310 | } | |
2311 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2312 | return res; | |
2313 | } | |
2314 | ||
2315 | #ifdef CONFIG_SCSI_PROC_FS | |
2316 | static Sg_fd * | |
2317 | sg_get_nth_sfp(Sg_device * sdp, int nth) | |
2318 | { | |
2319 | Sg_fd *resp; | |
2320 | unsigned long iflags; | |
2321 | int k; | |
2322 | ||
7c07d613 | 2323 | read_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2324 | for (k = 0, resp = sdp->headfp; resp && (k < nth); |
2325 | ++k, resp = resp->nextfp) ; | |
7c07d613 | 2326 | read_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2327 | return resp; |
2328 | } | |
2329 | #endif | |
2330 | ||
2331 | static Sg_fd * | |
2332 | sg_add_sfp(Sg_device * sdp, int dev) | |
2333 | { | |
2334 | Sg_fd *sfp; | |
2335 | unsigned long iflags; | |
44ec9542 | 2336 | int bufflen; |
1da177e4 | 2337 | |
d6b10348 | 2338 | sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); |
1da177e4 LT |
2339 | if (!sfp) |
2340 | return NULL; | |
d6b10348 | 2341 | |
1da177e4 LT |
2342 | init_waitqueue_head(&sfp->read_wait); |
2343 | rwlock_init(&sfp->rq_list_lock); | |
2344 | ||
2345 | sfp->timeout = SG_DEFAULT_TIMEOUT; | |
2346 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2347 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2348 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2349 | sdp->device->host->unchecked_isa_dma : 1; | |
2350 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2351 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2352 | sfp->parentdp = sdp; | |
7c07d613 | 2353 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2354 | if (!sdp->headfp) |
2355 | sdp->headfp = sfp; | |
2356 | else { /* add to tail of existing list */ | |
2357 | Sg_fd *pfp = sdp->headfp; | |
2358 | while (pfp->nextfp) | |
2359 | pfp = pfp->nextfp; | |
2360 | pfp->nextfp = sfp; | |
2361 | } | |
7c07d613 | 2362 | write_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 | 2363 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); |
6460e75a DG |
2364 | if (unlikely(sg_big_buff != def_reserved_size)) |
2365 | sg_big_buff = def_reserved_size; | |
2366 | ||
44ec9542 AS |
2367 | bufflen = min_t(int, sg_big_buff, |
2368 | sdp->device->request_queue->max_sectors * 512); | |
2369 | sg_build_reserve(sfp, bufflen); | |
1da177e4 LT |
2370 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", |
2371 | sfp->reserve.bufflen, sfp->reserve.k_use_sg)); | |
2372 | return sfp; | |
2373 | } | |
2374 | ||
2375 | static void | |
2376 | __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2377 | { | |
2378 | Sg_fd *fp; | |
2379 | Sg_fd *prev_fp; | |
2380 | ||
2381 | prev_fp = sdp->headfp; | |
2382 | if (sfp == prev_fp) | |
2383 | sdp->headfp = prev_fp->nextfp; | |
2384 | else { | |
2385 | while ((fp = prev_fp->nextfp)) { | |
2386 | if (sfp == fp) { | |
2387 | prev_fp->nextfp = fp->nextfp; | |
2388 | break; | |
2389 | } | |
2390 | prev_fp = fp; | |
2391 | } | |
2392 | } | |
2393 | if (sfp->reserve.bufflen > 0) { | |
2394 | SCSI_LOG_TIMEOUT(6, | |
2395 | printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2396 | (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); | |
1da177e4 LT |
2397 | sg_remove_scat(&sfp->reserve); |
2398 | } | |
2399 | sfp->parentdp = NULL; | |
2400 | SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); | |
d6b10348 | 2401 | kfree(sfp); |
1da177e4 LT |
2402 | } |
2403 | ||
2404 | /* Returns 0 in normal case, 1 when detached and sdp object removed */ | |
2405 | static int | |
2406 | sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2407 | { | |
2408 | Sg_request *srp; | |
2409 | Sg_request *tsrp; | |
2410 | int dirty = 0; | |
2411 | int res = 0; | |
2412 | ||
2413 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
2414 | tsrp = srp->nextrp; | |
2415 | if (sg_srp_done(srp, sfp)) | |
2416 | sg_finish_rem_req(srp); | |
2417 | else | |
2418 | ++dirty; | |
2419 | } | |
2420 | if (0 == dirty) { | |
2421 | unsigned long iflags; | |
2422 | ||
7c07d613 | 2423 | write_lock_irqsave(&sg_index_lock, iflags); |
1da177e4 LT |
2424 | __sg_remove_sfp(sdp, sfp); |
2425 | if (sdp->detached && (NULL == sdp->headfp)) { | |
7c07d613 JB |
2426 | idr_remove(&sg_index_idr, sdp->index); |
2427 | kfree(sdp); | |
1da177e4 LT |
2428 | res = 1; |
2429 | } | |
7c07d613 | 2430 | write_unlock_irqrestore(&sg_index_lock, iflags); |
1da177e4 LT |
2431 | } else { |
2432 | /* MOD_INC's to inhibit unloading sg and associated adapter driver */ | |
2433 | /* only bump the access_count if we actually succeeded in | |
2434 | * throwing another counter on the host module */ | |
2435 | scsi_device_get(sdp->device); /* XXX: retval ignored? */ | |
2436 | sfp->closed = 1; /* flag dirty state on this fd */ | |
2437 | SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", | |
2438 | dirty)); | |
2439 | } | |
2440 | return res; | |
2441 | } | |
2442 | ||
2443 | static int | |
2444 | sg_res_in_use(Sg_fd * sfp) | |
2445 | { | |
2446 | const Sg_request *srp; | |
2447 | unsigned long iflags; | |
2448 | ||
2449 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2450 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2451 | if (srp->res_used) | |
2452 | break; | |
2453 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2454 | return srp ? 1 : 0; | |
2455 | } | |
2456 | ||
6460e75a | 2457 | /* The size fetched (value output via retSzp) set when non-NULL return */ |
d6b10348 | 2458 | static struct page * |
1da177e4 LT |
2459 | sg_page_malloc(int rqSz, int lowDma, int *retSzp) |
2460 | { | |
d6b10348 | 2461 | struct page *resp = NULL; |
c53033f6 | 2462 | gfp_t page_mask; |
1da177e4 | 2463 | int order, a_size; |
6460e75a | 2464 | int resSz; |
1da177e4 | 2465 | |
6460e75a | 2466 | if ((rqSz <= 0) || (NULL == retSzp)) |
1da177e4 LT |
2467 | return resp; |
2468 | ||
2469 | if (lowDma) | |
f9aed0e2 | 2470 | page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN; |
1da177e4 | 2471 | else |
f9aed0e2 | 2472 | page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; |
1da177e4 LT |
2473 | |
2474 | for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; | |
2475 | order++, a_size <<= 1) ; | |
6460e75a | 2476 | resSz = a_size; /* rounded up if necessary */ |
d6b10348 | 2477 | resp = alloc_pages(page_mask, order); |
6460e75a | 2478 | while ((!resp) && order) { |
1da177e4 LT |
2479 | --order; |
2480 | a_size >>= 1; /* divide by 2, until PAGE_SIZE */ | |
d6b10348 | 2481 | resp = alloc_pages(page_mask, order); /* try half */ |
1da177e4 LT |
2482 | resSz = a_size; |
2483 | } | |
2484 | if (resp) { | |
2485 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
41ed16fa | 2486 | memset(page_address(resp), 0, resSz); |
6460e75a | 2487 | *retSzp = resSz; |
1da177e4 LT |
2488 | } |
2489 | return resp; | |
2490 | } | |
2491 | ||
2492 | static void | |
d6b10348 | 2493 | sg_page_free(struct page *page, int size) |
1da177e4 LT |
2494 | { |
2495 | int order, a_size; | |
2496 | ||
d6b10348 | 2497 | if (!page) |
1da177e4 LT |
2498 | return; |
2499 | for (order = 0, a_size = PAGE_SIZE; a_size < size; | |
2500 | order++, a_size <<= 1) ; | |
d6b10348 | 2501 | __free_pages(page, order); |
1da177e4 LT |
2502 | } |
2503 | ||
2504 | #ifndef MAINTENANCE_IN_CMD | |
2505 | #define MAINTENANCE_IN_CMD 0xa3 | |
2506 | #endif | |
2507 | ||
2508 | static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, | |
2509 | INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, | |
2510 | READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, | |
2511 | SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD | |
2512 | }; | |
2513 | ||
2514 | static int | |
2515 | sg_allow_access(unsigned char opcode, char dev_type) | |
2516 | { | |
2517 | int k; | |
2518 | ||
2519 | if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ | |
2520 | return 1; | |
2521 | for (k = 0; k < sizeof (allow_ops); ++k) { | |
2522 | if (opcode == allow_ops[k]) | |
2523 | return 1; | |
2524 | } | |
2525 | return 0; | |
2526 | } | |
2527 | ||
2528 | #ifdef CONFIG_SCSI_PROC_FS | |
7c07d613 JB |
2529 | static int |
2530 | sg_idr_max_id(int id, void *p, void *data) | |
2531 | { | |
2532 | int *k = data; | |
2533 | ||
2534 | if (*k < id) | |
2535 | *k = id; | |
2536 | ||
2537 | return 0; | |
2538 | } | |
2539 | ||
1da177e4 LT |
2540 | static int |
2541 | sg_last_dev(void) | |
2542 | { | |
53474c04 | 2543 | int k = -1; |
1da177e4 LT |
2544 | unsigned long iflags; |
2545 | ||
7c07d613 JB |
2546 | read_lock_irqsave(&sg_index_lock, iflags); |
2547 | idr_for_each(&sg_index_idr, sg_idr_max_id, &k); | |
2548 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
1da177e4 LT |
2549 | return k + 1; /* origin 1 */ |
2550 | } | |
2551 | #endif | |
2552 | ||
2553 | static Sg_device * | |
2554 | sg_get_dev(int dev) | |
2555 | { | |
7c07d613 | 2556 | Sg_device *sdp; |
1da177e4 LT |
2557 | unsigned long iflags; |
2558 | ||
7c07d613 JB |
2559 | read_lock_irqsave(&sg_index_lock, iflags); |
2560 | sdp = idr_find(&sg_index_idr, dev); | |
2561 | read_unlock_irqrestore(&sg_index_lock, iflags); | |
2562 | ||
1da177e4 LT |
2563 | return sdp; |
2564 | } | |
2565 | ||
2566 | #ifdef CONFIG_SCSI_PROC_FS | |
2567 | ||
2568 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2569 | ||
2570 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2571 | ||
2572 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2573 | ||
2574 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2575 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2576 | size_t count, loff_t *off); | |
2577 | static struct file_operations adio_fops = { | |
2578 | /* .owner, .read and .llseek added in sg_proc_init() */ | |
2579 | .open = sg_proc_single_open_adio, | |
2580 | .write = sg_proc_write_adio, | |
2581 | .release = single_release, | |
2582 | }; | |
2583 | ||
2584 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2585 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2586 | const char __user *buffer, size_t count, loff_t *off); | |
2587 | static struct file_operations dressz_fops = { | |
2588 | .open = sg_proc_single_open_dressz, | |
2589 | .write = sg_proc_write_dressz, | |
2590 | .release = single_release, | |
2591 | }; | |
2592 | ||
2593 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2594 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
2595 | static struct file_operations version_fops = { | |
2596 | .open = sg_proc_single_open_version, | |
2597 | .release = single_release, | |
2598 | }; | |
2599 | ||
2600 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2601 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
2602 | static struct file_operations devhdr_fops = { | |
2603 | .open = sg_proc_single_open_devhdr, | |
2604 | .release = single_release, | |
2605 | }; | |
2606 | ||
2607 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2608 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2609 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2610 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2611 | static void dev_seq_stop(struct seq_file *s, void *v); | |
2612 | static struct file_operations dev_fops = { | |
2613 | .open = sg_proc_open_dev, | |
2614 | .release = seq_release, | |
2615 | }; | |
2616 | static struct seq_operations dev_seq_ops = { | |
2617 | .start = dev_seq_start, | |
2618 | .next = dev_seq_next, | |
2619 | .stop = dev_seq_stop, | |
2620 | .show = sg_proc_seq_show_dev, | |
2621 | }; | |
2622 | ||
2623 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2624 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
2625 | static struct file_operations devstrs_fops = { | |
2626 | .open = sg_proc_open_devstrs, | |
2627 | .release = seq_release, | |
2628 | }; | |
2629 | static struct seq_operations devstrs_seq_ops = { | |
2630 | .start = dev_seq_start, | |
2631 | .next = dev_seq_next, | |
2632 | .stop = dev_seq_stop, | |
2633 | .show = sg_proc_seq_show_devstrs, | |
2634 | }; | |
2635 | ||
2636 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2637 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
2638 | static struct file_operations debug_fops = { | |
2639 | .open = sg_proc_open_debug, | |
2640 | .release = seq_release, | |
2641 | }; | |
2642 | static struct seq_operations debug_seq_ops = { | |
2643 | .start = dev_seq_start, | |
2644 | .next = dev_seq_next, | |
2645 | .stop = dev_seq_stop, | |
2646 | .show = sg_proc_seq_show_debug, | |
2647 | }; | |
2648 | ||
2649 | ||
2650 | struct sg_proc_leaf { | |
2651 | const char * name; | |
2652 | struct file_operations * fops; | |
2653 | }; | |
2654 | ||
2655 | static struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2656 | {"allow_dio", &adio_fops}, | |
2657 | {"debug", &debug_fops}, | |
2658 | {"def_reserved_size", &dressz_fops}, | |
2659 | {"device_hdr", &devhdr_fops}, | |
2660 | {"devices", &dev_fops}, | |
2661 | {"device_strs", &devstrs_fops}, | |
2662 | {"version", &version_fops} | |
2663 | }; | |
2664 | ||
2665 | static int | |
2666 | sg_proc_init(void) | |
2667 | { | |
2668 | int k, mask; | |
6391a113 | 2669 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2670 | struct proc_dir_entry *pdep; |
2671 | struct sg_proc_leaf * leaf; | |
2672 | ||
66600221 | 2673 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2674 | if (!sg_proc_sgp) |
2675 | return 1; | |
2676 | for (k = 0; k < num_leaves; ++k) { | |
2677 | leaf = &sg_proc_leaf_arr[k]; | |
2678 | mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
2679 | pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); | |
2680 | if (pdep) { | |
2681 | leaf->fops->owner = THIS_MODULE, | |
2682 | leaf->fops->read = seq_read, | |
2683 | leaf->fops->llseek = seq_lseek, | |
2684 | pdep->proc_fops = leaf->fops; | |
2685 | } | |
2686 | } | |
2687 | return 0; | |
2688 | } | |
2689 | ||
2690 | static void | |
2691 | sg_proc_cleanup(void) | |
2692 | { | |
2693 | int k; | |
6391a113 | 2694 | int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); |
1da177e4 LT |
2695 | |
2696 | if (!sg_proc_sgp) | |
2697 | return; | |
2698 | for (k = 0; k < num_leaves; ++k) | |
2699 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2700 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2701 | } | |
2702 | ||
2703 | ||
2704 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2705 | { | |
2706 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2707 | return 0; | |
2708 | } | |
2709 | ||
2710 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2711 | { | |
2712 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2713 | } | |
2714 | ||
2715 | static ssize_t | |
2716 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2717 | size_t count, loff_t *off) | |
2718 | { | |
2719 | int num; | |
2720 | char buff[11]; | |
2721 | ||
2722 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2723 | return -EACCES; | |
2724 | num = (count < 10) ? count : 10; | |
2725 | if (copy_from_user(buff, buffer, num)) | |
2726 | return -EFAULT; | |
2727 | buff[num] = '\0'; | |
2728 | sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; | |
2729 | return count; | |
2730 | } | |
2731 | ||
2732 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2733 | { | |
2734 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2735 | } | |
2736 | ||
2737 | static ssize_t | |
2738 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2739 | size_t count, loff_t *off) | |
2740 | { | |
2741 | int num; | |
2742 | unsigned long k = ULONG_MAX; | |
2743 | char buff[11]; | |
2744 | ||
2745 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2746 | return -EACCES; | |
2747 | num = (count < 10) ? count : 10; | |
2748 | if (copy_from_user(buff, buffer, num)) | |
2749 | return -EFAULT; | |
2750 | buff[num] = '\0'; | |
2751 | k = simple_strtoul(buff, NULL, 10); | |
2752 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2753 | sg_big_buff = k; | |
2754 | return count; | |
2755 | } | |
2756 | return -ERANGE; | |
2757 | } | |
2758 | ||
2759 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2760 | { | |
2761 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2762 | sg_version_date); | |
2763 | return 0; | |
2764 | } | |
2765 | ||
2766 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2767 | { | |
2768 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2769 | } | |
2770 | ||
2771 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2772 | { | |
2773 | seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" | |
2774 | "online\n"); | |
2775 | return 0; | |
2776 | } | |
2777 | ||
2778 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2779 | { | |
2780 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2781 | } | |
2782 | ||
2783 | struct sg_proc_deviter { | |
2784 | loff_t index; | |
2785 | size_t max; | |
2786 | }; | |
2787 | ||
2788 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2789 | { | |
2790 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2791 | ||
729d70f5 | 2792 | s->private = it; |
1da177e4 LT |
2793 | if (! it) |
2794 | return NULL; | |
729d70f5 | 2795 | |
1da177e4 LT |
2796 | it->index = *pos; |
2797 | it->max = sg_last_dev(); | |
2798 | if (it->index >= it->max) | |
729d70f5 | 2799 | return NULL; |
1da177e4 | 2800 | return it; |
1da177e4 LT |
2801 | } |
2802 | ||
2803 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2804 | { | |
729d70f5 | 2805 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2806 | |
2807 | *pos = ++it->index; | |
2808 | return (it->index < it->max) ? it : NULL; | |
2809 | } | |
2810 | ||
2811 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2812 | { | |
729d70f5 | 2813 | kfree(s->private); |
1da177e4 LT |
2814 | } |
2815 | ||
2816 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2817 | { | |
2818 | return seq_open(file, &dev_seq_ops); | |
2819 | } | |
2820 | ||
2821 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2822 | { | |
2823 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2824 | Sg_device *sdp; | |
2825 | struct scsi_device *scsidp; | |
2826 | ||
2827 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2828 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2829 | seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", | |
2830 | scsidp->host->host_no, scsidp->channel, | |
2831 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
2832 | 1, | |
2833 | (int) scsidp->queue_depth, | |
2834 | (int) scsidp->device_busy, | |
2835 | (int) scsi_device_online(scsidp)); | |
2836 | else | |
2837 | seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
2838 | return 0; | |
2839 | } | |
2840 | ||
2841 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
2842 | { | |
2843 | return seq_open(file, &devstrs_seq_ops); | |
2844 | } | |
2845 | ||
2846 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
2847 | { | |
2848 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2849 | Sg_device *sdp; | |
2850 | struct scsi_device *scsidp; | |
2851 | ||
2852 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2853 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
2854 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
2855 | scsidp->vendor, scsidp->model, scsidp->rev); | |
2856 | else | |
2857 | seq_printf(s, "<no active device>\n"); | |
2858 | return 0; | |
2859 | } | |
2860 | ||
2861 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) | |
2862 | { | |
2863 | int k, m, new_interface, blen, usg; | |
2864 | Sg_request *srp; | |
2865 | Sg_fd *fp; | |
2866 | const sg_io_hdr_t *hp; | |
2867 | const char * cp; | |
cb59e840 | 2868 | unsigned int ms; |
1da177e4 LT |
2869 | |
2870 | for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { | |
2871 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " | |
2872 | "(res)sgat=%d low_dma=%d\n", k + 1, | |
2873 | jiffies_to_msecs(fp->timeout), | |
2874 | fp->reserve.bufflen, | |
2875 | (int) fp->reserve.k_use_sg, | |
2876 | (int) fp->low_dma); | |
2877 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", | |
2878 | (int) fp->cmd_q, (int) fp->force_packid, | |
2879 | (int) fp->keep_orphan, (int) fp->closed); | |
2880 | for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { | |
2881 | hp = &srp->header; | |
2882 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
2883 | if (srp->res_used) { | |
2884 | if (new_interface && | |
2885 | (SG_FLAG_MMAP_IO & hp->flags)) | |
2886 | cp = " mmap>> "; | |
2887 | else | |
2888 | cp = " rb>> "; | |
2889 | } else { | |
2890 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
2891 | cp = " dio>> "; | |
2892 | else | |
2893 | cp = " "; | |
2894 | } | |
2895 | seq_printf(s, cp); | |
d6b10348 MC |
2896 | blen = srp->data.bufflen; |
2897 | usg = srp->data.k_use_sg; | |
1da177e4 LT |
2898 | seq_printf(s, srp->done ? |
2899 | ((1 == srp->done) ? "rcv:" : "fin:") | |
d6b10348 | 2900 | : "act:"); |
1da177e4 LT |
2901 | seq_printf(s, " id=%d blen=%d", |
2902 | srp->header.pack_id, blen); | |
2903 | if (srp->done) | |
2904 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 DG |
2905 | else { |
2906 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 2907 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 DG |
2908 | (new_interface ? hp->timeout : |
2909 | jiffies_to_msecs(fp->timeout)), | |
2910 | (ms > hp->duration ? ms - hp->duration : 0)); | |
2911 | } | |
1da177e4 LT |
2912 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
2913 | (int) srp->data.cmd_opcode); | |
2914 | } | |
2915 | if (0 == m) | |
2916 | seq_printf(s, " No requests active\n"); | |
2917 | } | |
2918 | } | |
2919 | ||
2920 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
2921 | { | |
2922 | return seq_open(file, &debug_seq_ops); | |
2923 | } | |
2924 | ||
2925 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
2926 | { | |
2927 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2928 | Sg_device *sdp; | |
2929 | ||
2930 | if (it && (0 == it->index)) { | |
7c07d613 JB |
2931 | seq_printf(s, "max_active_device=%d(origin 1)\n", |
2932 | (int)it->max); | |
1da177e4 LT |
2933 | seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); |
2934 | } | |
2935 | sdp = it ? sg_get_dev(it->index) : NULL; | |
2936 | if (sdp) { | |
2937 | struct scsi_device *scsidp = sdp->device; | |
2938 | ||
2939 | if (NULL == scsidp) { | |
2940 | seq_printf(s, "device %d detached ??\n", | |
2941 | (int)it->index); | |
2942 | return 0; | |
2943 | } | |
2944 | ||
2945 | if (sg_get_nth_sfp(sdp, 0)) { | |
2946 | seq_printf(s, " >>> device=%s ", | |
2947 | sdp->disk->disk_name); | |
2948 | if (sdp->detached) | |
2949 | seq_printf(s, "detached pending close "); | |
2950 | else | |
2951 | seq_printf | |
2952 | (s, "scsi%d chan=%d id=%d lun=%d em=%d", | |
2953 | scsidp->host->host_no, | |
2954 | scsidp->channel, scsidp->id, | |
2955 | scsidp->lun, | |
2956 | scsidp->host->hostt->emulated); | |
2957 | seq_printf(s, " sg_tablesize=%d excl=%d\n", | |
2958 | sdp->sg_tablesize, sdp->exclude); | |
2959 | } | |
2960 | sg_proc_debug_helper(s, sdp); | |
2961 | } | |
2962 | return 0; | |
2963 | } | |
2964 | ||
2965 | #endif /* CONFIG_SCSI_PROC_FS */ | |
2966 | ||
2967 | module_init(init_sg); | |
2968 | module_exit(exit_sg); |