Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * History: | |
3 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), | |
4 | * to allow user process control of SCSI devices. | |
5 | * Development Sponsored by Killy Corp. NY NY | |
6 | * | |
7 | * Original driver (sg.c): | |
8 | * Copyright (C) 1992 Lawrence Foard | |
9 | * Version 2 and 3 extensions to driver: | |
10 | * Copyright (C) 1998 - 2005 Douglas Gilbert | |
11 | * | |
12 | * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | ||
cb59e840 DG |
21 | static int sg_version_num = 30533; /* 2 digits for each component */ |
22 | #define SG_VERSION_STR "3.5.33" | |
1da177e4 LT |
23 | |
24 | /* | |
25 | * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: | |
26 | * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First | |
27 | * the kernel/module needs to be built with CONFIG_SCSI_LOGGING | |
28 | * (otherwise the macros compile to empty statements). | |
29 | * | |
30 | */ | |
31 | #include <linux/config.h> | |
32 | #include <linux/module.h> | |
33 | ||
34 | #include <linux/fs.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/sched.h> | |
37 | #include <linux/string.h> | |
38 | #include <linux/mm.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/mtio.h> | |
41 | #include <linux/ioctl.h> | |
42 | #include <linux/fcntl.h> | |
43 | #include <linux/init.h> | |
44 | #include <linux/poll.h> | |
45 | #include <linux/smp_lock.h> | |
46 | #include <linux/moduleparam.h> | |
47 | #include <linux/devfs_fs_kernel.h> | |
48 | #include <linux/cdev.h> | |
49 | #include <linux/seq_file.h> | |
50 | #include <linux/blkdev.h> | |
51 | #include <linux/delay.h> | |
378f058c | 52 | #include <linux/scatterlist.h> |
1da177e4 LT |
53 | |
54 | #include "scsi.h" | |
db9dff36 | 55 | #include <scsi/scsi_dbg.h> |
1da177e4 LT |
56 | #include <scsi/scsi_host.h> |
57 | #include <scsi/scsi_driver.h> | |
58 | #include <scsi/scsi_ioctl.h> | |
59 | #include <scsi/sg.h> | |
60 | ||
61 | #include "scsi_logging.h" | |
62 | ||
63 | #ifdef CONFIG_SCSI_PROC_FS | |
64 | #include <linux/proc_fs.h> | |
1c8e71d7 | 65 | static char *sg_version_date = "20050908"; |
1da177e4 LT |
66 | |
67 | static int sg_proc_init(void); | |
68 | static void sg_proc_cleanup(void); | |
69 | #endif | |
70 | ||
1da177e4 LT |
71 | #define SG_ALLOW_DIO_DEF 0 |
72 | #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ | |
73 | ||
74 | #define SG_MAX_DEVS 32768 | |
75 | ||
76 | /* | |
77 | * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) | |
78 | * Then when using 32 bit integers x * m may overflow during the calculation. | |
79 | * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m | |
80 | * calculates the same, but prevents the overflow when both m and d | |
81 | * are "small" numbers (like HZ and USER_HZ). | |
82 | * Of course an overflow is inavoidable if the result of muldiv doesn't fit | |
83 | * in 32 bits. | |
84 | */ | |
85 | #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) | |
86 | ||
87 | #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) | |
88 | ||
89 | int sg_big_buff = SG_DEF_RESERVED_SIZE; | |
90 | /* N.B. This variable is readable and writeable via | |
91 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
92 | of this size (or less if there is not enough memory) will be reserved | |
93 | for use by this file descriptor. [Deprecated usage: this variable is also | |
94 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
95 | the kernel (i.e. it is not a module).] */ | |
96 | static int def_reserved_size = -1; /* picks up init parameter */ | |
97 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
98 | ||
99 | #define SG_SECTOR_SZ 512 | |
100 | #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) | |
101 | ||
102 | #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ | |
103 | ||
d8539d81 DT |
104 | static int sg_add(struct class_device *, struct class_interface *); |
105 | static void sg_remove(struct class_device *, struct class_interface *); | |
1da177e4 LT |
106 | |
107 | static Scsi_Request *dummy_cmdp; /* only used for sizeof */ | |
108 | ||
109 | static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock | |
110 | file descriptor list for device */ | |
111 | ||
112 | static struct class_interface sg_interface = { | |
113 | .add = sg_add, | |
114 | .remove = sg_remove, | |
115 | }; | |
116 | ||
117 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
118 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
119 | unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ | |
120 | unsigned bufflen; /* Size of (aggregate) data buffer */ | |
121 | unsigned b_malloc_len; /* actual len malloc'ed in buffer */ | |
122 | void *buffer; /* Data buffer or scatter list (k_use_sg>0) */ | |
123 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ | |
124 | unsigned char cmd_opcode; /* first byte of command */ | |
125 | } Sg_scatter_hold; | |
126 | ||
127 | struct sg_device; /* forward declarations */ | |
128 | struct sg_fd; | |
129 | ||
130 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
131 | Scsi_Request *my_cmdp; /* != 0 when request with lower levels */ | |
132 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ | |
133 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
134 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
135 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
136 | unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)]; | |
137 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ | |
138 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
139 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
140 | volatile char done; /* 0->before bh, 1->before read, 2->read */ | |
141 | } Sg_request; | |
142 | ||
143 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
144 | struct sg_fd *nextfp; /* NULL when last opened fd on this device */ | |
145 | struct sg_device *parentdp; /* owning device */ | |
146 | wait_queue_head_t read_wait; /* queue read until command done */ | |
147 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
148 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
149 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
150 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
151 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
152 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
153 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
154 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
155 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
156 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
157 | volatile char closed; /* 1 -> fd closed but request(s) outstanding */ | |
158 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
159 | char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ | |
160 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
161 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
162 | } Sg_fd; | |
163 | ||
164 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
165 | struct scsi_device *device; | |
166 | wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ | |
167 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
168 | Sg_fd *headfp; /* first open fd belonging to this device */ | |
169 | volatile char detached; /* 0->attached, 1->detached pending removal */ | |
170 | volatile char exclude; /* opened for exclusive access */ | |
171 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ | |
172 | struct gendisk *disk; | |
173 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
174 | } Sg_device; | |
175 | ||
176 | static int sg_fasync(int fd, struct file *filp, int mode); | |
177 | static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */ | |
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); | |
198 | static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp); | |
199 | static void sg_page_free(char *buff, int size); | |
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); | |
210 | static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp); | |
211 | #ifdef CONFIG_SCSI_PROC_FS | |
212 | static int sg_last_dev(void); | |
213 | #endif | |
214 | ||
215 | static Sg_device **sg_dev_arr = NULL; | |
216 | static int sg_dev_max; | |
217 | static int sg_nr_dev; | |
218 | ||
219 | #define SZ_SG_HEADER sizeof(struct sg_header) | |
220 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
221 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
222 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
223 | ||
224 | static int | |
225 | sg_open(struct inode *inode, struct file *filp) | |
226 | { | |
227 | int dev = iminor(inode); | |
228 | int flags = filp->f_flags; | |
229 | Sg_device *sdp; | |
230 | Sg_fd *sfp; | |
231 | int res; | |
232 | int retval; | |
233 | ||
234 | nonseekable_open(inode, filp); | |
235 | SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); | |
236 | sdp = sg_get_dev(dev); | |
237 | if ((!sdp) || (!sdp->device)) | |
238 | return -ENXIO; | |
239 | if (sdp->detached) | |
240 | return -ENODEV; | |
241 | ||
242 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
243 | /* Prevent the device driver from vanishing while we sleep */ | |
244 | retval = scsi_device_get(sdp->device); | |
245 | if (retval) | |
246 | return retval; | |
247 | ||
248 | if (!((flags & O_NONBLOCK) || | |
249 | scsi_block_when_processing_errors(sdp->device))) { | |
250 | retval = -ENXIO; | |
251 | /* we are in error recovery for this device */ | |
252 | goto error_out; | |
253 | } | |
254 | ||
255 | if (flags & O_EXCL) { | |
256 | if (O_RDONLY == (flags & O_ACCMODE)) { | |
257 | retval = -EPERM; /* Can't lock it with read only access */ | |
258 | goto error_out; | |
259 | } | |
260 | if (sdp->headfp && (flags & O_NONBLOCK)) { | |
261 | retval = -EBUSY; | |
262 | goto error_out; | |
263 | } | |
264 | res = 0; | |
265 | __wait_event_interruptible(sdp->o_excl_wait, | |
266 | ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); | |
267 | if (res) { | |
268 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
269 | goto error_out; | |
270 | } | |
271 | } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ | |
272 | if (flags & O_NONBLOCK) { | |
273 | retval = -EBUSY; | |
274 | goto error_out; | |
275 | } | |
276 | res = 0; | |
277 | __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), | |
278 | res); | |
279 | if (res) { | |
280 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
281 | goto error_out; | |
282 | } | |
283 | } | |
284 | if (sdp->detached) { | |
285 | retval = -ENODEV; | |
286 | goto error_out; | |
287 | } | |
288 | if (!sdp->headfp) { /* no existing opens on this device */ | |
289 | sdp->sgdebug = 0; | |
290 | sdp->sg_tablesize = sdp->device->host->sg_tablesize; | |
291 | } | |
292 | if ((sfp = sg_add_sfp(sdp, dev))) | |
293 | filp->private_data = sfp; | |
294 | else { | |
295 | if (flags & O_EXCL) | |
296 | sdp->exclude = 0; /* undo if error */ | |
297 | retval = -ENOMEM; | |
298 | goto error_out; | |
299 | } | |
300 | return 0; | |
301 | ||
302 | error_out: | |
303 | scsi_device_put(sdp->device); | |
304 | return retval; | |
305 | } | |
306 | ||
307 | /* Following function was formerly called 'sg_close' */ | |
308 | static int | |
309 | sg_release(struct inode *inode, struct file *filp) | |
310 | { | |
311 | Sg_device *sdp; | |
312 | Sg_fd *sfp; | |
313 | ||
314 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
315 | return -ENXIO; | |
316 | SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); | |
317 | sg_fasync(-1, filp, 0); /* remove filp from async notification list */ | |
318 | if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ | |
319 | if (!sdp->detached) { | |
320 | scsi_device_put(sdp->device); | |
321 | } | |
322 | sdp->exclude = 0; | |
323 | wake_up_interruptible(&sdp->o_excl_wait); | |
324 | } | |
325 | return 0; | |
326 | } | |
327 | ||
328 | static ssize_t | |
329 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
330 | { | |
1da177e4 LT |
331 | Sg_device *sdp; |
332 | Sg_fd *sfp; | |
333 | Sg_request *srp; | |
334 | int req_pack_id = -1; | |
1da177e4 | 335 | sg_io_hdr_t *hp; |
cb59e840 DG |
336 | struct sg_header *old_hdr = NULL; |
337 | int retval = 0; | |
1da177e4 LT |
338 | |
339 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
340 | return -ENXIO; | |
341 | SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", | |
342 | sdp->disk->disk_name, (int) count)); | |
343 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
344 | return -EFAULT; | |
345 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 DG |
346 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
347 | if (!old_hdr) | |
348 | return -ENOMEM; | |
349 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
350 | retval = -EFAULT; | |
351 | goto free_old_hdr; | |
352 | } | |
353 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 354 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 DG |
355 | sg_io_hdr_t *new_hdr; |
356 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
357 | if (!new_hdr) { | |
358 | retval = -ENOMEM; | |
359 | goto free_old_hdr; | |
360 | } | |
361 | retval =__copy_from_user | |
362 | (new_hdr, buf, SZ_SG_IO_HDR); | |
363 | req_pack_id = new_hdr->pack_id; | |
364 | kfree(new_hdr); | |
365 | if (retval) { | |
366 | retval = -EFAULT; | |
367 | goto free_old_hdr; | |
368 | } | |
1da177e4 LT |
369 | } |
370 | } else | |
cb59e840 | 371 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
372 | } |
373 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
374 | if (!srp) { /* now wait on packet to arrive */ | |
cb59e840 DG |
375 | if (sdp->detached) { |
376 | retval = -ENODEV; | |
377 | goto free_old_hdr; | |
378 | } | |
379 | if (filp->f_flags & O_NONBLOCK) { | |
380 | retval = -EAGAIN; | |
381 | goto free_old_hdr; | |
382 | } | |
1da177e4 | 383 | while (1) { |
cb59e840 | 384 | retval = 0; /* following macro beats race condition */ |
1da177e4 | 385 | __wait_event_interruptible(sfp->read_wait, |
cb59e840 DG |
386 | (sdp->detached || |
387 | (srp = sg_get_rq_mark(sfp, req_pack_id))), | |
388 | retval); | |
389 | if (sdp->detached) { | |
390 | retval = -ENODEV; | |
391 | goto free_old_hdr; | |
392 | } | |
393 | if (0 == retval) | |
1da177e4 | 394 | break; |
cb59e840 DG |
395 | |
396 | /* -ERESTARTSYS as signal hit process */ | |
397 | goto free_old_hdr; | |
1da177e4 LT |
398 | } |
399 | } | |
cb59e840 DG |
400 | if (srp->header.interface_id != '\0') { |
401 | retval = sg_new_read(sfp, buf, count, srp); | |
402 | goto free_old_hdr; | |
403 | } | |
1da177e4 LT |
404 | |
405 | hp = &srp->header; | |
cb59e840 DG |
406 | if (old_hdr == NULL) { |
407 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
408 | if (! old_hdr) { | |
409 | retval = -ENOMEM; | |
410 | goto free_old_hdr; | |
411 | } | |
412 | } | |
413 | memset(old_hdr, 0, SZ_SG_HEADER); | |
414 | old_hdr->reply_len = (int) hp->timeout; | |
415 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
416 | old_hdr->pack_id = hp->pack_id; | |
417 | old_hdr->twelve_byte = | |
1da177e4 | 418 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 DG |
419 | old_hdr->target_status = hp->masked_status; |
420 | old_hdr->host_status = hp->host_status; | |
421 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
422 | if ((CHECK_CONDITION & hp->masked_status) || |
423 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 DG |
424 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
425 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
426 | switch (hp->host_status) { |
427 | /* This setup of 'result' is for backward compatibility and is best | |
428 | ignored by the user who should use target, host + driver status */ | |
429 | case DID_OK: | |
430 | case DID_PASSTHROUGH: | |
431 | case DID_SOFT_ERROR: | |
cb59e840 | 432 | old_hdr->result = 0; |
1da177e4 LT |
433 | break; |
434 | case DID_NO_CONNECT: | |
435 | case DID_BUS_BUSY: | |
436 | case DID_TIME_OUT: | |
cb59e840 | 437 | old_hdr->result = EBUSY; |
1da177e4 LT |
438 | break; |
439 | case DID_BAD_TARGET: | |
440 | case DID_ABORT: | |
441 | case DID_PARITY: | |
442 | case DID_RESET: | |
443 | case DID_BAD_INTR: | |
cb59e840 | 444 | old_hdr->result = EIO; |
1da177e4 LT |
445 | break; |
446 | case DID_ERROR: | |
cb59e840 | 447 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
448 | hp->masked_status == GOOD) ? 0 : EIO; |
449 | break; | |
450 | default: | |
cb59e840 | 451 | old_hdr->result = EIO; |
1da177e4 LT |
452 | break; |
453 | } | |
454 | ||
455 | /* Now copy the result back to the user buffer. */ | |
456 | if (count >= SZ_SG_HEADER) { | |
cb59e840 DG |
457 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
458 | retval = -EFAULT; | |
459 | goto free_old_hdr; | |
460 | } | |
1da177e4 | 461 | buf += SZ_SG_HEADER; |
cb59e840 DG |
462 | if (count > old_hdr->reply_len) |
463 | count = old_hdr->reply_len; | |
1da177e4 | 464 | if (count > SZ_SG_HEADER) { |
cb59e840 DG |
465 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
466 | retval = -EFAULT; | |
467 | goto free_old_hdr; | |
468 | } | |
1da177e4 LT |
469 | } |
470 | } else | |
cb59e840 | 471 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 472 | sg_finish_rem_req(srp); |
cb59e840 DG |
473 | retval = count; |
474 | free_old_hdr: | |
c9475cb0 | 475 | kfree(old_hdr); |
cb59e840 | 476 | return retval; |
1da177e4 LT |
477 | } |
478 | ||
479 | static ssize_t | |
480 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
481 | { | |
482 | sg_io_hdr_t *hp = &srp->header; | |
483 | int err = 0; | |
484 | int len; | |
485 | ||
486 | if (count < SZ_SG_IO_HDR) { | |
487 | err = -EINVAL; | |
488 | goto err_out; | |
489 | } | |
490 | hp->sb_len_wr = 0; | |
491 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
492 | if ((CHECK_CONDITION & hp->masked_status) || | |
493 | (DRIVER_SENSE & hp->driver_status)) { | |
494 | int sb_len = sizeof (dummy_cmdp->sr_sense_buffer); | |
495 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; | |
496 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
497 | len = (len > sb_len) ? sb_len : len; | |
498 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
499 | err = -EFAULT; | |
500 | goto err_out; | |
501 | } | |
502 | hp->sb_len_wr = len; | |
503 | } | |
504 | } | |
505 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
506 | hp->info |= SG_INFO_CHECK; | |
507 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
508 | err = -EFAULT; | |
509 | goto err_out; | |
510 | } | |
511 | err = sg_read_xfer(srp); | |
512 | err_out: | |
513 | sg_finish_rem_req(srp); | |
514 | return (0 == err) ? count : err; | |
515 | } | |
516 | ||
517 | static ssize_t | |
518 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
519 | { | |
520 | int mxsize, cmd_size, k; | |
521 | int input_size, blocking; | |
522 | unsigned char opcode; | |
523 | Sg_device *sdp; | |
524 | Sg_fd *sfp; | |
525 | Sg_request *srp; | |
526 | struct sg_header old_hdr; | |
527 | sg_io_hdr_t *hp; | |
528 | unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; | |
529 | ||
530 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
531 | return -ENXIO; | |
532 | SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", | |
533 | sdp->disk->disk_name, (int) count)); | |
534 | if (sdp->detached) | |
535 | return -ENODEV; | |
536 | if (!((filp->f_flags & O_NONBLOCK) || | |
537 | scsi_block_when_processing_errors(sdp->device))) | |
538 | return -ENXIO; | |
539 | ||
540 | if (!access_ok(VERIFY_READ, buf, count)) | |
541 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
542 | if (count < SZ_SG_HEADER) | |
543 | return -EIO; | |
544 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
545 | return -EFAULT; | |
546 | blocking = !(filp->f_flags & O_NONBLOCK); | |
547 | if (old_hdr.reply_len < 0) | |
548 | return sg_new_write(sfp, buf, count, blocking, 0, NULL); | |
549 | if (count < (SZ_SG_HEADER + 6)) | |
550 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
551 | ||
552 | if (!(srp = sg_add_request(sfp))) { | |
553 | SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); | |
554 | return -EDOM; | |
555 | } | |
556 | buf += SZ_SG_HEADER; | |
557 | __get_user(opcode, buf); | |
558 | if (sfp->next_cmd_len > 0) { | |
559 | if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { | |
560 | SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); | |
561 | sfp->next_cmd_len = 0; | |
562 | sg_remove_request(sfp, srp); | |
563 | return -EIO; | |
564 | } | |
565 | cmd_size = sfp->next_cmd_len; | |
566 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
567 | } else { | |
568 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
569 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
570 | cmd_size = 12; | |
571 | } | |
572 | SCSI_LOG_TIMEOUT(4, printk( | |
573 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
574 | /* Determine buffer size. */ | |
575 | input_size = count - cmd_size; | |
576 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
577 | mxsize -= SZ_SG_HEADER; | |
578 | input_size -= SZ_SG_HEADER; | |
579 | if (input_size < 0) { | |
580 | sg_remove_request(sfp, srp); | |
581 | return -EIO; /* User did not pass enough bytes for this command. */ | |
582 | } | |
583 | hp = &srp->header; | |
584 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
585 | hp->cmd_len = (unsigned char) cmd_size; | |
586 | hp->iovec_count = 0; | |
587 | hp->mx_sb_len = 0; | |
588 | if (input_size > 0) | |
589 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
590 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
591 | else | |
592 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
593 | hp->dxfer_len = mxsize; | |
594 | hp->dxferp = (char __user *)buf + cmd_size; | |
595 | hp->sbp = NULL; | |
596 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
597 | hp->flags = input_size; /* structure abuse ... */ | |
598 | hp->pack_id = old_hdr.pack_id; | |
599 | hp->usr_ptr = NULL; | |
600 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
601 | return -EFAULT; | |
602 | /* | |
603 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
604 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
605 | * is a non-zero input_size, so emit a warning. | |
606 | */ | |
607 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) | |
608 | if (printk_ratelimit()) | |
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); | |
616 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); | |
617 | return (k < 0) ? k : count; | |
618 | } | |
619 | ||
620 | static ssize_t | |
621 | sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, | |
622 | int blocking, int read_only, Sg_request ** o_srp) | |
623 | { | |
624 | int k; | |
625 | Sg_request *srp; | |
626 | sg_io_hdr_t *hp; | |
627 | unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; | |
628 | int timeout; | |
629 | unsigned long ul_timeout; | |
630 | ||
631 | if (count < SZ_SG_IO_HDR) | |
632 | return -EINVAL; | |
633 | if (!access_ok(VERIFY_READ, buf, count)) | |
634 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
635 | ||
636 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
637 | if (!(srp = sg_add_request(sfp))) { | |
638 | SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); | |
639 | return -EDOM; | |
640 | } | |
641 | hp = &srp->header; | |
642 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
643 | sg_remove_request(sfp, srp); | |
644 | return -EFAULT; | |
645 | } | |
646 | if (hp->interface_id != 'S') { | |
647 | sg_remove_request(sfp, srp); | |
648 | return -ENOSYS; | |
649 | } | |
650 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
651 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
652 | sg_remove_request(sfp, srp); | |
653 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
654 | } | |
655 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
656 | sg_remove_request(sfp, srp); | |
657 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
658 | } | |
659 | if (sg_res_in_use(sfp)) { | |
660 | sg_remove_request(sfp, srp); | |
661 | return -EBUSY; /* reserve buffer already being used */ | |
662 | } | |
663 | } | |
664 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
665 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
666 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
667 | sg_remove_request(sfp, srp); | |
668 | return -EMSGSIZE; | |
669 | } | |
670 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
671 | sg_remove_request(sfp, srp); | |
672 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
673 | } | |
674 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
675 | sg_remove_request(sfp, srp); | |
676 | return -EFAULT; | |
677 | } | |
678 | if (read_only && | |
679 | (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { | |
680 | sg_remove_request(sfp, srp); | |
681 | return -EPERM; | |
682 | } | |
683 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
684 | if (k < 0) | |
685 | return k; | |
686 | if (o_srp) | |
687 | *o_srp = srp; | |
688 | return count; | |
689 | } | |
690 | ||
691 | static int | |
692 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
693 | unsigned char *cmnd, int timeout, int blocking) | |
694 | { | |
695 | int k; | |
696 | Scsi_Request *SRpnt; | |
697 | Sg_device *sdp = sfp->parentdp; | |
698 | sg_io_hdr_t *hp = &srp->header; | |
699 | request_queue_t *q; | |
700 | ||
701 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
702 | hp->status = 0; | |
703 | hp->masked_status = 0; | |
704 | hp->msg_status = 0; | |
705 | hp->info = 0; | |
706 | hp->host_status = 0; | |
707 | hp->driver_status = 0; | |
708 | hp->resid = 0; | |
709 | SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
710 | (int) cmnd[0], (int) hp->cmd_len)); | |
711 | ||
712 | if ((k = sg_start_req(srp))) { | |
713 | SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); | |
714 | sg_finish_rem_req(srp); | |
715 | return k; /* probably out of space --> ENOMEM */ | |
716 | } | |
717 | if ((k = sg_write_xfer(srp))) { | |
718 | SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); | |
719 | sg_finish_rem_req(srp); | |
720 | return k; | |
721 | } | |
722 | if (sdp->detached) { | |
723 | sg_finish_rem_req(srp); | |
724 | return -ENODEV; | |
725 | } | |
726 | SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC); | |
727 | if (SRpnt == NULL) { | |
728 | SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n")); | |
729 | sg_finish_rem_req(srp); | |
730 | return -ENOMEM; | |
731 | } | |
732 | ||
733 | srp->my_cmdp = SRpnt; | |
734 | q = SRpnt->sr_device->request_queue; | |
735 | SRpnt->sr_request->rq_disk = sdp->disk; | |
736 | SRpnt->sr_sense_buffer[0] = 0; | |
737 | SRpnt->sr_cmd_len = hp->cmd_len; | |
738 | SRpnt->sr_use_sg = srp->data.k_use_sg; | |
739 | SRpnt->sr_sglist_len = srp->data.sglist_len; | |
740 | SRpnt->sr_bufflen = srp->data.bufflen; | |
741 | SRpnt->sr_underflow = 0; | |
742 | SRpnt->sr_buffer = srp->data.buffer; | |
743 | switch (hp->dxfer_direction) { | |
744 | case SG_DXFER_TO_FROM_DEV: | |
745 | case SG_DXFER_FROM_DEV: | |
be7db055 | 746 | SRpnt->sr_data_direction = DMA_FROM_DEVICE; |
1da177e4 LT |
747 | break; |
748 | case SG_DXFER_TO_DEV: | |
be7db055 | 749 | SRpnt->sr_data_direction = DMA_TO_DEVICE; |
1da177e4 LT |
750 | break; |
751 | case SG_DXFER_UNKNOWN: | |
be7db055 | 752 | SRpnt->sr_data_direction = DMA_BIDIRECTIONAL; |
1da177e4 LT |
753 | break; |
754 | default: | |
be7db055 | 755 | SRpnt->sr_data_direction = DMA_NONE; |
1da177e4 LT |
756 | break; |
757 | } | |
758 | SRpnt->upper_private_data = srp; | |
759 | srp->data.k_use_sg = 0; | |
760 | srp->data.sglist_len = 0; | |
761 | srp->data.bufflen = 0; | |
762 | srp->data.buffer = NULL; | |
cb59e840 | 763 | hp->duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
764 | /* Now send everything of to mid-level. The next time we hear about this |
765 | packet is when sg_cmd_done() is called (i.e. a callback). */ | |
766 | scsi_do_req(SRpnt, (void *) cmnd, | |
767 | (void *) SRpnt->sr_buffer, hp->dxfer_len, | |
768 | sg_cmd_done, timeout, SG_DEFAULT_RETRIES); | |
769 | /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */ | |
770 | return 0; | |
771 | } | |
772 | ||
773 | static int | |
774 | sg_srp_done(Sg_request *srp, Sg_fd *sfp) | |
775 | { | |
776 | unsigned long iflags; | |
777 | int done; | |
778 | ||
779 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
780 | done = srp->done; | |
781 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
782 | return done; | |
783 | } | |
784 | ||
785 | static int | |
786 | sg_ioctl(struct inode *inode, struct file *filp, | |
787 | unsigned int cmd_in, unsigned long arg) | |
788 | { | |
789 | void __user *p = (void __user *)arg; | |
790 | int __user *ip = p; | |
791 | int result, val, read_only; | |
792 | Sg_device *sdp; | |
793 | Sg_fd *sfp; | |
794 | Sg_request *srp; | |
795 | unsigned long iflags; | |
796 | ||
797 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
798 | return -ENXIO; | |
799 | SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", | |
800 | sdp->disk->disk_name, (int) cmd_in)); | |
801 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
802 | ||
803 | switch (cmd_in) { | |
804 | case SG_IO: | |
805 | { | |
806 | int blocking = 1; /* ignore O_NONBLOCK flag */ | |
807 | ||
808 | if (sdp->detached) | |
809 | return -ENODEV; | |
810 | if (!scsi_block_when_processing_errors(sdp->device)) | |
811 | return -ENXIO; | |
812 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
813 | return -EFAULT; | |
814 | result = | |
815 | sg_new_write(sfp, p, SZ_SG_IO_HDR, | |
816 | blocking, read_only, &srp); | |
817 | if (result < 0) | |
818 | return result; | |
819 | srp->sg_io_owned = 1; | |
820 | while (1) { | |
821 | result = 0; /* following macro to beat race condition */ | |
822 | __wait_event_interruptible(sfp->read_wait, | |
823 | (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), | |
824 | result); | |
825 | if (sdp->detached) | |
826 | return -ENODEV; | |
827 | if (sfp->closed) | |
828 | return 0; /* request packet dropped already */ | |
829 | if (0 == result) | |
830 | break; | |
831 | srp->orphan = 1; | |
832 | return result; /* -ERESTARTSYS because signal hit process */ | |
833 | } | |
834 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
835 | srp->done = 2; | |
836 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
837 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); | |
838 | return (result < 0) ? result : 0; | |
839 | } | |
840 | case SG_SET_TIMEOUT: | |
841 | result = get_user(val, ip); | |
842 | if (result) | |
843 | return result; | |
844 | if (val < 0) | |
845 | return -EIO; | |
846 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
847 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
848 | sfp->timeout_user = val; | |
849 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
850 | ||
851 | return 0; | |
852 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
853 | /* strange ..., for backward compatibility */ | |
854 | return sfp->timeout_user; | |
855 | case SG_SET_FORCE_LOW_DMA: | |
856 | result = get_user(val, ip); | |
857 | if (result) | |
858 | return result; | |
859 | if (val) { | |
860 | sfp->low_dma = 1; | |
861 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
862 | val = (int) sfp->reserve.bufflen; | |
863 | sg_remove_scat(&sfp->reserve); | |
864 | sg_build_reserve(sfp, val); | |
865 | } | |
866 | } else { | |
867 | if (sdp->detached) | |
868 | return -ENODEV; | |
869 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
870 | } | |
871 | return 0; | |
872 | case SG_GET_LOW_DMA: | |
873 | return put_user((int) sfp->low_dma, ip); | |
874 | case SG_GET_SCSI_ID: | |
875 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
876 | return -EFAULT; | |
877 | else { | |
878 | sg_scsi_id_t __user *sg_idp = p; | |
879 | ||
880 | if (sdp->detached) | |
881 | return -ENODEV; | |
882 | __put_user((int) sdp->device->host->host_no, | |
883 | &sg_idp->host_no); | |
884 | __put_user((int) sdp->device->channel, | |
885 | &sg_idp->channel); | |
886 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
887 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
888 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
889 | __put_user((short) sdp->device->host->cmd_per_lun, | |
890 | &sg_idp->h_cmd_per_lun); | |
891 | __put_user((short) sdp->device->queue_depth, | |
892 | &sg_idp->d_queue_depth); | |
893 | __put_user(0, &sg_idp->unused[0]); | |
894 | __put_user(0, &sg_idp->unused[1]); | |
895 | return 0; | |
896 | } | |
897 | case SG_SET_FORCE_PACK_ID: | |
898 | result = get_user(val, ip); | |
899 | if (result) | |
900 | return result; | |
901 | sfp->force_packid = val ? 1 : 0; | |
902 | return 0; | |
903 | case SG_GET_PACK_ID: | |
904 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
905 | return -EFAULT; | |
906 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
907 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
908 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
909 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
910 | iflags); | |
911 | __put_user(srp->header.pack_id, ip); | |
912 | return 0; | |
913 | } | |
914 | } | |
915 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
916 | __put_user(-1, ip); | |
917 | return 0; | |
918 | case SG_GET_NUM_WAITING: | |
919 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
920 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
921 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
922 | ++val; | |
923 | } | |
924 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
925 | return put_user(val, ip); | |
926 | case SG_GET_SG_TABLESIZE: | |
927 | return put_user(sdp->sg_tablesize, ip); | |
928 | case SG_SET_RESERVED_SIZE: | |
929 | result = get_user(val, ip); | |
930 | if (result) | |
931 | return result; | |
932 | if (val < 0) | |
933 | return -EINVAL; | |
934 | if (val != sfp->reserve.bufflen) { | |
935 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
936 | return -EBUSY; | |
937 | sg_remove_scat(&sfp->reserve); | |
938 | sg_build_reserve(sfp, val); | |
939 | } | |
940 | return 0; | |
941 | case SG_GET_RESERVED_SIZE: | |
942 | val = (int) sfp->reserve.bufflen; | |
943 | return put_user(val, ip); | |
944 | case SG_SET_COMMAND_Q: | |
945 | result = get_user(val, ip); | |
946 | if (result) | |
947 | return result; | |
948 | sfp->cmd_q = val ? 1 : 0; | |
949 | return 0; | |
950 | case SG_GET_COMMAND_Q: | |
951 | return put_user((int) sfp->cmd_q, ip); | |
952 | case SG_SET_KEEP_ORPHAN: | |
953 | result = get_user(val, ip); | |
954 | if (result) | |
955 | return result; | |
956 | sfp->keep_orphan = val; | |
957 | return 0; | |
958 | case SG_GET_KEEP_ORPHAN: | |
959 | return put_user((int) sfp->keep_orphan, ip); | |
960 | case SG_NEXT_CMD_LEN: | |
961 | result = get_user(val, ip); | |
962 | if (result) | |
963 | return result; | |
964 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
965 | return 0; | |
966 | case SG_GET_VERSION_NUM: | |
967 | return put_user(sg_version_num, ip); | |
968 | case SG_GET_ACCESS_COUNT: | |
969 | /* faked - we don't have a real access count anymore */ | |
970 | val = (sdp->device ? 1 : 0); | |
971 | return put_user(val, ip); | |
972 | case SG_GET_REQUEST_TABLE: | |
973 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
974 | return -EFAULT; | |
975 | else { | |
cb59e840 DG |
976 | sg_req_info_t *rinfo; |
977 | unsigned int ms; | |
978 | ||
979 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
980 | GFP_KERNEL); | |
981 | if (!rinfo) | |
982 | return -ENOMEM; | |
1da177e4 LT |
983 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
984 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
985 | ++val, srp = srp ? srp->nextrp : srp) { | |
986 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
987 | if (srp) { | |
988 | rinfo[val].req_state = srp->done + 1; | |
989 | rinfo[val].problem = | |
990 | srp->header.masked_status & | |
991 | srp->header.host_status & | |
992 | srp->header.driver_status; | |
cb59e840 DG |
993 | if (srp->done) |
994 | rinfo[val].duration = | |
995 | srp->header.duration; | |
996 | else { | |
997 | ms = jiffies_to_msecs(jiffies); | |
998 | rinfo[val].duration = | |
999 | (ms > srp->header.duration) ? | |
1000 | (ms - srp->header.duration) : 0; | |
1001 | } | |
1da177e4 | 1002 | rinfo[val].orphan = srp->orphan; |
cb59e840 DG |
1003 | rinfo[val].sg_io_owned = |
1004 | srp->sg_io_owned; | |
1005 | rinfo[val].pack_id = | |
1006 | srp->header.pack_id; | |
1007 | rinfo[val].usr_ptr = | |
1008 | srp->header.usr_ptr; | |
1da177e4 LT |
1009 | } |
1010 | } | |
1011 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 DG |
1012 | result = __copy_to_user(p, rinfo, |
1013 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
1014 | result = result ? -EFAULT : 0; | |
1015 | kfree(rinfo); | |
1016 | return result; | |
1da177e4 LT |
1017 | } |
1018 | case SG_EMULATED_HOST: | |
1019 | if (sdp->detached) | |
1020 | return -ENODEV; | |
1021 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1022 | case SG_SCSI_RESET: | |
1023 | if (sdp->detached) | |
1024 | return -ENODEV; | |
1025 | if (filp->f_flags & O_NONBLOCK) { | |
939647ee | 1026 | if (scsi_host_in_recovery(sdp->device->host)) |
1da177e4 LT |
1027 | return -EBUSY; |
1028 | } else if (!scsi_block_when_processing_errors(sdp->device)) | |
1029 | return -EBUSY; | |
1030 | result = get_user(val, ip); | |
1031 | if (result) | |
1032 | return result; | |
1033 | if (SG_SCSI_RESET_NOTHING == val) | |
1034 | return 0; | |
1035 | switch (val) { | |
1036 | case SG_SCSI_RESET_DEVICE: | |
1037 | val = SCSI_TRY_RESET_DEVICE; | |
1038 | break; | |
1039 | case SG_SCSI_RESET_BUS: | |
1040 | val = SCSI_TRY_RESET_BUS; | |
1041 | break; | |
1042 | case SG_SCSI_RESET_HOST: | |
1043 | val = SCSI_TRY_RESET_HOST; | |
1044 | break; | |
1045 | default: | |
1046 | return -EINVAL; | |
1047 | } | |
1048 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1049 | return -EACCES; | |
1050 | return (scsi_reset_provider(sdp->device, val) == | |
1051 | SUCCESS) ? 0 : -EIO; | |
1052 | case SCSI_IOCTL_SEND_COMMAND: | |
1053 | if (sdp->detached) | |
1054 | return -ENODEV; | |
1055 | if (read_only) { | |
1056 | unsigned char opcode = WRITE_6; | |
1057 | Scsi_Ioctl_Command __user *siocp = p; | |
1058 | ||
1059 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1060 | return -EFAULT; | |
1061 | if (!sg_allow_access(opcode, sdp->device->type)) | |
1062 | return -EPERM; | |
1063 | } | |
1064 | return scsi_ioctl_send_command(sdp->device, p); | |
1065 | case SG_SET_DEBUG: | |
1066 | result = get_user(val, ip); | |
1067 | if (result) | |
1068 | return result; | |
1069 | sdp->sgdebug = (char) val; | |
1070 | return 0; | |
1071 | case SCSI_IOCTL_GET_IDLUN: | |
1072 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1073 | case SCSI_IOCTL_PROBE_HOST: | |
1074 | case SG_GET_TRANSFORM: | |
1075 | if (sdp->detached) | |
1076 | return -ENODEV; | |
1077 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1078 | default: | |
1079 | if (read_only) | |
1080 | return -EPERM; /* don't know so take safe approach */ | |
1081 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | #ifdef CONFIG_COMPAT | |
1086 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1087 | { | |
1088 | Sg_device *sdp; | |
1089 | Sg_fd *sfp; | |
1090 | struct scsi_device *sdev; | |
1091 | ||
1092 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1093 | return -ENXIO; | |
1094 | ||
1095 | sdev = sdp->device; | |
1096 | if (sdev->host->hostt->compat_ioctl) { | |
1097 | int ret; | |
1098 | ||
1099 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1100 | ||
1101 | return ret; | |
1102 | } | |
1103 | ||
1104 | return -ENOIOCTLCMD; | |
1105 | } | |
1106 | #endif | |
1107 | ||
1108 | static unsigned int | |
1109 | sg_poll(struct file *filp, poll_table * wait) | |
1110 | { | |
1111 | unsigned int res = 0; | |
1112 | Sg_device *sdp; | |
1113 | Sg_fd *sfp; | |
1114 | Sg_request *srp; | |
1115 | int count = 0; | |
1116 | unsigned long iflags; | |
1117 | ||
1118 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) | |
1119 | || sfp->closed) | |
1120 | return POLLERR; | |
1121 | poll_wait(filp, &sfp->read_wait, wait); | |
1122 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1123 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1124 | /* if any read waiting, flag it */ | |
1125 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1126 | res = POLLIN | POLLRDNORM; | |
1127 | ++count; | |
1128 | } | |
1129 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1130 | ||
1131 | if (sdp->detached) | |
1132 | res |= POLLHUP; | |
1133 | else if (!sfp->cmd_q) { | |
1134 | if (0 == count) | |
1135 | res |= POLLOUT | POLLWRNORM; | |
1136 | } else if (count < SG_MAX_QUEUE) | |
1137 | res |= POLLOUT | POLLWRNORM; | |
1138 | SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", | |
1139 | sdp->disk->disk_name, (int) res)); | |
1140 | return res; | |
1141 | } | |
1142 | ||
1143 | static int | |
1144 | sg_fasync(int fd, struct file *filp, int mode) | |
1145 | { | |
1146 | int retval; | |
1147 | Sg_device *sdp; | |
1148 | Sg_fd *sfp; | |
1149 | ||
1150 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1151 | return -ENXIO; | |
1152 | SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", | |
1153 | sdp->disk->disk_name, mode)); | |
1154 | ||
1155 | retval = fasync_helper(fd, filp, mode, &sfp->async_qp); | |
1156 | return (retval < 0) ? retval : 0; | |
1157 | } | |
1158 | ||
1159 | static inline unsigned char * | |
1160 | sg_scatg2virt(const struct scatterlist *sclp) | |
1161 | { | |
1162 | return (sclp && sclp->page) ? | |
1163 | (unsigned char *) page_address(sclp->page) + sclp->offset : NULL; | |
1164 | } | |
1165 | ||
1166 | /* When startFinish==1 increments page counts for pages other than the | |
1167 | first of scatter gather elements obtained from __get_free_pages(). | |
1168 | When startFinish==0 decrements ... */ | |
1169 | static void | |
1170 | sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish) | |
1171 | { | |
1172 | void *page_ptr; | |
1173 | struct page *page; | |
1174 | int k, m; | |
1175 | ||
1176 | SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n", | |
1177 | startFinish, rsv_schp->k_use_sg)); | |
1178 | /* N.B. correction _not_ applied to base page of each allocation */ | |
1179 | if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ | |
1180 | struct scatterlist *sclp = rsv_schp->buffer; | |
1181 | ||
1182 | for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) { | |
1183 | for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) { | |
1184 | page_ptr = sg_scatg2virt(sclp) + m; | |
1185 | page = virt_to_page(page_ptr); | |
1186 | if (startFinish) | |
1187 | get_page(page); | |
1188 | else { | |
1189 | if (page_count(page) > 0) | |
1190 | __put_page(page); | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | } else { /* reserve buffer is just a single allocation */ | |
1195 | for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) { | |
1196 | page_ptr = (unsigned char *) rsv_schp->buffer + m; | |
1197 | page = virt_to_page(page_ptr); | |
1198 | if (startFinish) | |
1199 | get_page(page); | |
1200 | else { | |
1201 | if (page_count(page) > 0) | |
1202 | __put_page(page); | |
1203 | } | |
1204 | } | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | static struct page * | |
1209 | sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) | |
1210 | { | |
1211 | Sg_fd *sfp; | |
1212 | struct page *page = NOPAGE_SIGBUS; | |
1213 | void *page_ptr = NULL; | |
1214 | unsigned long offset; | |
1215 | Sg_scatter_hold *rsv_schp; | |
1216 | ||
1217 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
1218 | return page; | |
1219 | rsv_schp = &sfp->reserve; | |
1220 | offset = addr - vma->vm_start; | |
1221 | if (offset >= rsv_schp->bufflen) | |
1222 | return page; | |
1223 | SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", | |
1224 | offset, rsv_schp->k_use_sg)); | |
1225 | if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ | |
1226 | int k; | |
1227 | unsigned long sa = vma->vm_start; | |
1228 | unsigned long len; | |
1229 | struct scatterlist *sclp = rsv_schp->buffer; | |
1230 | ||
1231 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
1232 | ++k, ++sclp) { | |
1233 | len = vma->vm_end - sa; | |
1234 | len = (len < sclp->length) ? len : sclp->length; | |
1235 | if (offset < len) { | |
1236 | page_ptr = sg_scatg2virt(sclp) + offset; | |
1237 | page = virt_to_page(page_ptr); | |
1238 | get_page(page); /* increment page count */ | |
1239 | break; | |
1240 | } | |
1241 | sa += len; | |
1242 | offset -= len; | |
1243 | } | |
1244 | } else { /* reserve buffer is just a single allocation */ | |
1245 | page_ptr = (unsigned char *) rsv_schp->buffer + offset; | |
1246 | page = virt_to_page(page_ptr); | |
1247 | get_page(page); /* increment page count */ | |
1248 | } | |
1249 | if (type) | |
1250 | *type = VM_FAULT_MINOR; | |
1251 | return page; | |
1252 | } | |
1253 | ||
1254 | static struct vm_operations_struct sg_mmap_vm_ops = { | |
1255 | .nopage = sg_vma_nopage, | |
1256 | }; | |
1257 | ||
1258 | static int | |
1259 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1260 | { | |
1261 | Sg_fd *sfp; | |
cb59e840 | 1262 | unsigned long req_sz; |
1da177e4 LT |
1263 | Sg_scatter_hold *rsv_schp; |
1264 | ||
1265 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1266 | return -ENXIO; | |
cb59e840 | 1267 | req_sz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
1268 | SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", |
1269 | (void *) vma->vm_start, (int) req_sz)); | |
1270 | if (vma->vm_pgoff) | |
1271 | return -EINVAL; /* want no offset */ | |
1272 | rsv_schp = &sfp->reserve; | |
1273 | if (req_sz > rsv_schp->bufflen) | |
1274 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1275 | ||
1276 | if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ | |
1277 | int k; | |
1278 | unsigned long sa = vma->vm_start; | |
1279 | unsigned long len; | |
1280 | struct scatterlist *sclp = rsv_schp->buffer; | |
1281 | ||
1282 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
1283 | ++k, ++sclp) { | |
1284 | if (0 != sclp->offset) | |
1285 | return -EFAULT; /* non page aligned memory ?? */ | |
1286 | len = vma->vm_end - sa; | |
1287 | len = (len < sclp->length) ? len : sclp->length; | |
1288 | sa += len; | |
1289 | } | |
1290 | } else { /* reserve buffer is just a single allocation */ | |
1291 | if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1)) | |
1292 | return -EFAULT; /* non page aligned memory ?? */ | |
1293 | } | |
1294 | if (0 == sfp->mmap_called) { | |
1295 | sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */ | |
1296 | sfp->mmap_called = 1; | |
1297 | } | |
1c8e71d7 | 1298 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
1299 | vma->vm_private_data = sfp; |
1300 | vma->vm_ops = &sg_mmap_vm_ops; | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | /* This function is a "bottom half" handler that is called by the | |
1305 | * mid level when a command is completed (or has failed). */ | |
1306 | static void | |
1307 | sg_cmd_done(Scsi_Cmnd * SCpnt) | |
1308 | { | |
1309 | Scsi_Request *SRpnt = NULL; | |
1310 | Sg_device *sdp = NULL; | |
1311 | Sg_fd *sfp; | |
1312 | Sg_request *srp = NULL; | |
1313 | unsigned long iflags; | |
cb59e840 | 1314 | unsigned int ms; |
1da177e4 LT |
1315 | |
1316 | if (SCpnt && (SRpnt = SCpnt->sc_request)) | |
1317 | srp = (Sg_request *) SRpnt->upper_private_data; | |
1318 | if (NULL == srp) { | |
1319 | printk(KERN_ERR "sg_cmd_done: NULL request\n"); | |
1320 | if (SRpnt) | |
1321 | scsi_release_request(SRpnt); | |
1322 | return; | |
1323 | } | |
1324 | sfp = srp->parentfp; | |
1325 | if (sfp) | |
1326 | sdp = sfp->parentdp; | |
1327 | if ((NULL == sdp) || sdp->detached) { | |
1328 | printk(KERN_INFO "sg_cmd_done: device detached\n"); | |
1329 | scsi_release_request(SRpnt); | |
1330 | return; | |
1331 | } | |
1332 | ||
1333 | /* First transfer ownership of data buffers to sg_device object. */ | |
1334 | srp->data.k_use_sg = SRpnt->sr_use_sg; | |
1335 | srp->data.sglist_len = SRpnt->sr_sglist_len; | |
1336 | srp->data.bufflen = SRpnt->sr_bufflen; | |
1337 | srp->data.buffer = SRpnt->sr_buffer; | |
1338 | /* now clear out request structure */ | |
1339 | SRpnt->sr_use_sg = 0; | |
1340 | SRpnt->sr_sglist_len = 0; | |
1341 | SRpnt->sr_bufflen = 0; | |
1342 | SRpnt->sr_buffer = NULL; | |
1343 | SRpnt->sr_underflow = 0; | |
1344 | SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */ | |
1345 | ||
1346 | srp->my_cmdp = NULL; | |
1347 | ||
1348 | SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", | |
1349 | sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result)); | |
1350 | srp->header.resid = SCpnt->resid; | |
cb59e840 DG |
1351 | ms = jiffies_to_msecs(jiffies); |
1352 | srp->header.duration = (ms > srp->header.duration) ? | |
1353 | (ms - srp->header.duration) : 0; | |
1da177e4 LT |
1354 | if (0 != SRpnt->sr_result) { |
1355 | struct scsi_sense_hdr sshdr; | |
1356 | ||
1357 | memcpy(srp->sense_b, SRpnt->sr_sense_buffer, | |
1358 | sizeof (srp->sense_b)); | |
1359 | srp->header.status = 0xff & SRpnt->sr_result; | |
1360 | srp->header.masked_status = status_byte(SRpnt->sr_result); | |
1361 | srp->header.msg_status = msg_byte(SRpnt->sr_result); | |
1362 | srp->header.host_status = host_byte(SRpnt->sr_result); | |
1363 | srp->header.driver_status = driver_byte(SRpnt->sr_result); | |
1364 | if ((sdp->sgdebug > 0) && | |
1365 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1366 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
db9dff36 | 1367 | scsi_print_req_sense("sg_cmd_done", SRpnt); |
1da177e4 LT |
1368 | |
1369 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
1370 | if (driver_byte(SRpnt->sr_result) != 0 | |
1371 | && scsi_command_normalize_sense(SCpnt, &sshdr) | |
1372 | && !scsi_sense_is_deferred(&sshdr) | |
1373 | && sshdr.sense_key == UNIT_ATTENTION | |
1374 | && sdp->device->removable) { | |
1375 | /* Detected possible disc change. Set the bit - this */ | |
1376 | /* may be used if there are filesystems using this device */ | |
1377 | sdp->device->changed = 1; | |
1378 | } | |
1379 | } | |
1380 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1381 | ||
1382 | scsi_release_request(SRpnt); | |
1383 | SRpnt = NULL; | |
1384 | if (sfp->closed) { /* whoops this fd already released, cleanup */ | |
1385 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); | |
1386 | sg_finish_rem_req(srp); | |
1387 | srp = NULL; | |
1388 | if (NULL == sfp->headrp) { | |
1389 | SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); | |
1390 | if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ | |
1391 | scsi_device_put(sdp->device); | |
1392 | } | |
1393 | sfp = NULL; | |
1394 | } | |
1395 | } else if (srp && srp->orphan) { | |
1396 | if (sfp->keep_orphan) | |
1397 | srp->sg_io_owned = 0; | |
1398 | else { | |
1399 | sg_finish_rem_req(srp); | |
1400 | srp = NULL; | |
1401 | } | |
1402 | } | |
1403 | if (sfp && srp) { | |
1404 | /* Now wake up any sg_read() that is waiting for this packet. */ | |
1405 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); | |
1406 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1407 | srp->done = 1; | |
1408 | wake_up_interruptible(&sfp->read_wait); | |
1409 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1410 | } | |
1411 | } | |
1412 | ||
1413 | static struct file_operations sg_fops = { | |
1414 | .owner = THIS_MODULE, | |
1415 | .read = sg_read, | |
1416 | .write = sg_write, | |
1417 | .poll = sg_poll, | |
1418 | .ioctl = sg_ioctl, | |
1419 | #ifdef CONFIG_COMPAT | |
1420 | .compat_ioctl = sg_compat_ioctl, | |
1421 | #endif | |
1422 | .open = sg_open, | |
1423 | .mmap = sg_mmap, | |
1424 | .release = sg_release, | |
1425 | .fasync = sg_fasync, | |
1426 | }; | |
1427 | ||
d253878b | 1428 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1429 | |
1430 | static int sg_sysfs_valid = 0; | |
1431 | ||
1432 | static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) | |
1433 | { | |
1434 | Sg_device *sdp; | |
1435 | unsigned long iflags; | |
1436 | void *old_sg_dev_arr = NULL; | |
1437 | int k, error; | |
1438 | ||
1439 | sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL); | |
1440 | if (!sdp) { | |
1441 | printk(KERN_WARNING "kmalloc Sg_device failure\n"); | |
1442 | return -ENOMEM; | |
1443 | } | |
1444 | ||
1445 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1446 | if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ | |
1447 | Sg_device **tmp_da; | |
1448 | int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; | |
1449 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1450 | ||
1451 | tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); | |
1452 | if (unlikely(!tmp_da)) | |
1453 | goto expand_failed; | |
1454 | ||
1455 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1456 | memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *)); | |
1457 | memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); | |
1458 | old_sg_dev_arr = sg_dev_arr; | |
1459 | sg_dev_arr = tmp_da; | |
1460 | sg_dev_max = tmp_dev_max; | |
1461 | } | |
1462 | ||
1463 | for (k = 0; k < sg_dev_max; k++) | |
1464 | if (!sg_dev_arr[k]) | |
1465 | break; | |
1466 | if (unlikely(k >= SG_MAX_DEVS)) | |
1467 | goto overflow; | |
1468 | ||
1469 | memset(sdp, 0, sizeof(*sdp)); | |
1470 | SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); | |
1471 | sprintf(disk->disk_name, "sg%d", k); | |
1472 | disk->first_minor = k; | |
1473 | sdp->disk = disk; | |
1474 | sdp->device = scsidp; | |
1475 | init_waitqueue_head(&sdp->o_excl_wait); | |
1476 | sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0; | |
1477 | ||
1478 | sg_nr_dev++; | |
1479 | sg_dev_arr[k] = sdp; | |
1480 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1481 | error = k; | |
1482 | ||
1483 | out: | |
1484 | if (error < 0) | |
1485 | kfree(sdp); | |
1486 | kfree(old_sg_dev_arr); | |
1487 | return error; | |
1488 | ||
1489 | expand_failed: | |
1490 | printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); | |
1491 | error = -ENOMEM; | |
1492 | goto out; | |
1493 | ||
1494 | overflow: | |
1495 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
9ccfc756 JB |
1496 | sdev_printk(KERN_WARNING, scsidp, |
1497 | "Unable to attach sg device type=%d, minor " | |
1498 | "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); | |
1da177e4 LT |
1499 | error = -ENODEV; |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | static int | |
d8539d81 | 1504 | sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1505 | { |
1506 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
1507 | struct gendisk *disk; | |
1508 | Sg_device *sdp = NULL; | |
1509 | struct cdev * cdev = NULL; | |
1510 | int error, k; | |
1511 | ||
1512 | disk = alloc_disk(1); | |
1513 | if (!disk) { | |
1514 | printk(KERN_WARNING "alloc_disk failed\n"); | |
1515 | return -ENOMEM; | |
1516 | } | |
1517 | disk->major = SCSI_GENERIC_MAJOR; | |
1518 | ||
1519 | error = -ENOMEM; | |
1520 | cdev = cdev_alloc(); | |
1521 | if (!cdev) { | |
1522 | printk(KERN_WARNING "cdev_alloc failed\n"); | |
1523 | goto out; | |
1524 | } | |
1525 | cdev->owner = THIS_MODULE; | |
1526 | cdev->ops = &sg_fops; | |
1527 | ||
1528 | error = sg_alloc(disk, scsidp); | |
1529 | if (error < 0) { | |
1530 | printk(KERN_WARNING "sg_alloc failed\n"); | |
1531 | goto out; | |
1532 | } | |
1533 | k = error; | |
1534 | sdp = sg_dev_arr[k]; | |
1535 | ||
1536 | devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k), | |
1537 | S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, | |
1538 | "%s/generic", scsidp->devfs_name); | |
1539 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); | |
1540 | if (error) { | |
1541 | devfs_remove("%s/generic", scsidp->devfs_name); | |
1542 | goto out; | |
1543 | } | |
1544 | sdp->cdev = cdev; | |
1545 | if (sg_sysfs_valid) { | |
1546 | struct class_device * sg_class_member; | |
1547 | ||
53f46542 | 1548 | sg_class_member = class_device_create(sg_sysfs_class, NULL, |
1da177e4 LT |
1549 | MKDEV(SCSI_GENERIC_MAJOR, k), |
1550 | cl_dev->dev, "%s", | |
1551 | disk->disk_name); | |
1552 | if (IS_ERR(sg_class_member)) | |
1553 | printk(KERN_WARNING "sg_add: " | |
d253878b | 1554 | "class_device_create failed\n"); |
1da177e4 LT |
1555 | class_set_devdata(sg_class_member, sdp); |
1556 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, | |
1557 | &sg_class_member->kobj, "generic"); | |
1558 | if (error) | |
1559 | printk(KERN_ERR "sg_add: unable to make symlink " | |
1560 | "'generic' back to sg%d\n", k); | |
1561 | } else | |
1562 | printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); | |
1563 | ||
9ccfc756 JB |
1564 | sdev_printk(KERN_NOTICE, scsidp, |
1565 | "Attached scsi generic sg%d type %d\n", k,scsidp->type); | |
1da177e4 LT |
1566 | |
1567 | return 0; | |
1568 | ||
1569 | out: | |
1570 | put_disk(disk); | |
1571 | if (cdev) | |
1572 | cdev_del(cdev); | |
1573 | return error; | |
1574 | } | |
1575 | ||
1576 | static void | |
d8539d81 | 1577 | sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1578 | { |
1579 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
1580 | Sg_device *sdp = NULL; | |
1581 | unsigned long iflags; | |
1582 | Sg_fd *sfp; | |
1583 | Sg_fd *tsfp; | |
1584 | Sg_request *srp; | |
1585 | Sg_request *tsrp; | |
1586 | int k, delay; | |
1587 | ||
1588 | if (NULL == sg_dev_arr) | |
1589 | return; | |
1590 | delay = 0; | |
1591 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1592 | for (k = 0; k < sg_dev_max; k++) { | |
1593 | sdp = sg_dev_arr[k]; | |
1594 | if ((NULL == sdp) || (sdp->device != scsidp)) | |
1595 | continue; /* dirty but lowers nesting */ | |
1596 | if (sdp->headfp) { | |
1597 | sdp->detached = 1; | |
1598 | for (sfp = sdp->headfp; sfp; sfp = tsfp) { | |
1599 | tsfp = sfp->nextfp; | |
1600 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
1601 | tsrp = srp->nextrp; | |
1602 | if (sfp->closed || (0 == sg_srp_done(srp, sfp))) | |
1603 | sg_finish_rem_req(srp); | |
1604 | } | |
1605 | if (sfp->closed) { | |
1606 | scsi_device_put(sdp->device); | |
1607 | __sg_remove_sfp(sdp, sfp); | |
1608 | } else { | |
1609 | delay = 1; | |
1610 | wake_up_interruptible(&sfp->read_wait); | |
1611 | kill_fasync(&sfp->async_qp, SIGPOLL, | |
1612 | POLL_HUP); | |
1613 | } | |
1614 | } | |
1615 | SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); | |
1616 | if (NULL == sdp->headfp) { | |
1617 | sg_dev_arr[k] = NULL; | |
1618 | } | |
1619 | } else { /* nothing active, simple case */ | |
1620 | SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); | |
1621 | sg_dev_arr[k] = NULL; | |
1622 | } | |
1623 | sg_nr_dev--; | |
1624 | break; | |
1625 | } | |
1626 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1627 | ||
1628 | if (sdp) { | |
1629 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
d253878b | 1630 | class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); |
1da177e4 LT |
1631 | cdev_del(sdp->cdev); |
1632 | sdp->cdev = NULL; | |
1633 | devfs_remove("%s/generic", scsidp->devfs_name); | |
1634 | put_disk(sdp->disk); | |
1635 | sdp->disk = NULL; | |
1636 | if (NULL == sdp->headfp) | |
1637 | kfree((char *) sdp); | |
1638 | } | |
1639 | ||
1640 | if (delay) | |
1641 | msleep(10); /* dirty detach so delay device destruction */ | |
1642 | } | |
1643 | ||
1644 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
1645 | * of sysfs parameters (which module_param doesn't yet support). | |
1646 | * Sysfs parameters defined explicitly below. | |
1647 | */ | |
1648 | module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); | |
1649 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); | |
1650 | ||
1651 | MODULE_AUTHOR("Douglas Gilbert"); | |
1652 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1653 | MODULE_LICENSE("GPL"); | |
1654 | MODULE_VERSION(SG_VERSION_STR); | |
1655 | ||
1656 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); | |
1657 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1658 | ||
1659 | static int __init | |
1660 | init_sg(void) | |
1661 | { | |
1662 | int rc; | |
1663 | ||
1664 | if (def_reserved_size >= 0) | |
1665 | sg_big_buff = def_reserved_size; | |
1666 | ||
1667 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1668 | SG_MAX_DEVS, "sg"); | |
1669 | if (rc) | |
1670 | return rc; | |
d253878b | 1671 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1672 | if ( IS_ERR(sg_sysfs_class) ) { |
1673 | rc = PTR_ERR(sg_sysfs_class); | |
1674 | goto err_out; | |
1675 | } | |
1676 | sg_sysfs_valid = 1; | |
1677 | rc = scsi_register_interface(&sg_interface); | |
1678 | if (0 == rc) { | |
1679 | #ifdef CONFIG_SCSI_PROC_FS | |
1680 | sg_proc_init(); | |
1681 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1682 | return 0; | |
1683 | } | |
d253878b | 1684 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1685 | err_out: |
1686 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1687 | return rc; | |
1688 | } | |
1689 | ||
1690 | static void __exit | |
1691 | exit_sg(void) | |
1692 | { | |
1693 | #ifdef CONFIG_SCSI_PROC_FS | |
1694 | sg_proc_cleanup(); | |
1695 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1696 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1697 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1698 | sg_sysfs_valid = 0; |
1699 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1700 | SG_MAX_DEVS); | |
c9475cb0 JJ |
1701 | kfree((char *)sg_dev_arr); |
1702 | sg_dev_arr = NULL; | |
1da177e4 LT |
1703 | sg_dev_max = 0; |
1704 | } | |
1705 | ||
1706 | static int | |
1707 | sg_start_req(Sg_request * srp) | |
1708 | { | |
1709 | int res; | |
1710 | Sg_fd *sfp = srp->parentfp; | |
1711 | sg_io_hdr_t *hp = &srp->header; | |
1712 | int dxfer_len = (int) hp->dxfer_len; | |
1713 | int dxfer_dir = hp->dxfer_direction; | |
1714 | Sg_scatter_hold *req_schp = &srp->data; | |
1715 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1716 | ||
1717 | SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); | |
1718 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) | |
1719 | return 0; | |
1720 | if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && | |
1721 | (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && | |
1722 | (!sfp->parentdp->device->host->unchecked_isa_dma)) { | |
1723 | res = sg_build_direct(srp, sfp, dxfer_len); | |
1724 | if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ | |
1725 | return res; | |
1726 | } | |
1727 | if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) | |
1728 | sg_link_reserve(sfp, srp, dxfer_len); | |
1729 | else { | |
1730 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1731 | if (res) { | |
1732 | sg_remove_scat(req_schp); | |
1733 | return res; | |
1734 | } | |
1735 | } | |
1736 | return 0; | |
1737 | } | |
1738 | ||
1739 | static void | |
1740 | sg_finish_rem_req(Sg_request * srp) | |
1741 | { | |
1742 | Sg_fd *sfp = srp->parentfp; | |
1743 | Sg_scatter_hold *req_schp = &srp->data; | |
1744 | ||
1745 | SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); | |
1746 | if (srp->res_used) | |
1747 | sg_unlink_reserve(sfp, srp); | |
1748 | else | |
1749 | sg_remove_scat(req_schp); | |
1750 | sg_remove_request(sfp, srp); | |
1751 | } | |
1752 | ||
1753 | static int | |
1754 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1755 | { | |
1756 | int ret_sz; | |
1757 | int elem_sz = sizeof (struct scatterlist); | |
1758 | int sg_bufflen = tablesize * elem_sz; | |
1759 | int mx_sc_elems = tablesize; | |
1760 | ||
1761 | schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz); | |
1762 | if (!schp->buffer) | |
1763 | return -ENOMEM; | |
1764 | else if (ret_sz != sg_bufflen) { | |
1765 | sg_bufflen = ret_sz; | |
1766 | mx_sc_elems = sg_bufflen / elem_sz; | |
1767 | } | |
1768 | schp->sglist_len = sg_bufflen; | |
1769 | memset(schp->buffer, 0, sg_bufflen); | |
1770 | return mx_sc_elems; /* number of scat_gath elements allocated */ | |
1771 | } | |
1772 | ||
1773 | #ifdef SG_ALLOW_DIO_CODE | |
1774 | /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ | |
1775 | /* hopefully this generic code will moved to a library */ | |
1776 | ||
1777 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
1778 | - mapping of all pages not successful | |
1779 | - any page is above max_pfn | |
1780 | (i.e., either completely successful or fails) | |
1781 | */ | |
1782 | static int | |
1783 | st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
1784 | unsigned long uaddr, size_t count, int rw, | |
1785 | unsigned long max_pfn) | |
1786 | { | |
deb92b7e DG |
1787 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1788 | unsigned long start = uaddr >> PAGE_SHIFT; | |
1789 | const int nr_pages = end - start; | |
1da177e4 | 1790 | int res, i, j; |
1da177e4 LT |
1791 | struct page **pages; |
1792 | ||
1da177e4 LT |
1793 | /* User attempted Overflow! */ |
1794 | if ((uaddr + count) < uaddr) | |
1795 | return -EINVAL; | |
1796 | ||
1797 | /* Too big */ | |
1798 | if (nr_pages > max_pages) | |
1799 | return -ENOMEM; | |
1800 | ||
1801 | /* Hmm? */ | |
1802 | if (count == 0) | |
1803 | return 0; | |
1804 | ||
1805 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) | |
1806 | return -ENOMEM; | |
1807 | ||
1808 | /* Try to fault in all of the necessary pages */ | |
1809 | down_read(¤t->mm->mmap_sem); | |
1810 | /* rw==READ means read from drive, write into memory area */ | |
1811 | res = get_user_pages( | |
1812 | current, | |
1813 | current->mm, | |
1814 | uaddr, | |
1815 | nr_pages, | |
1816 | rw == READ, | |
1817 | 0, /* don't force */ | |
1818 | pages, | |
1819 | NULL); | |
1820 | up_read(¤t->mm->mmap_sem); | |
1821 | ||
1822 | /* Errors and no page mapped should return here */ | |
1823 | if (res < nr_pages) | |
1824 | goto out_unmap; | |
1825 | ||
1826 | for (i=0; i < nr_pages; i++) { | |
1827 | /* FIXME: flush superflous for rw==READ, | |
1828 | * probably wrong function for rw==WRITE | |
1829 | */ | |
1830 | flush_dcache_page(pages[i]); | |
1831 | if (page_to_pfn(pages[i]) > max_pfn) | |
1832 | goto out_unlock; | |
1833 | /* ?? Is locking needed? I don't think so */ | |
1834 | /* if (TestSetPageLocked(pages[i])) | |
1835 | goto out_unlock; */ | |
1836 | } | |
1837 | ||
1838 | /* Populate the scatter/gather list */ | |
1839 | sgl[0].page = pages[0]; | |
1840 | sgl[0].offset = uaddr & ~PAGE_MASK; | |
1841 | if (nr_pages > 1) { | |
1842 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
1843 | count -= sgl[0].length; | |
1844 | for (i=1; i < nr_pages ; i++) { | |
1845 | sgl[i].offset = 0; | |
1846 | sgl[i].page = pages[i]; | |
1847 | sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; | |
1848 | count -= PAGE_SIZE; | |
1849 | } | |
1850 | } | |
1851 | else { | |
1852 | sgl[0].length = count; | |
1853 | } | |
1854 | ||
1855 | kfree(pages); | |
1856 | return nr_pages; | |
1857 | ||
1858 | out_unlock: | |
1859 | /* for (j=0; j < i; j++) | |
1860 | unlock_page(pages[j]); */ | |
1861 | res = 0; | |
1862 | out_unmap: | |
4d5cda06 | 1863 | if (res > 0) { |
1da177e4 LT |
1864 | for (j=0; j < res; j++) |
1865 | page_cache_release(pages[j]); | |
4d5cda06 HD |
1866 | res = 0; |
1867 | } | |
1da177e4 LT |
1868 | kfree(pages); |
1869 | return res; | |
1870 | } | |
1871 | ||
1872 | ||
1873 | /* And unmap them... */ | |
1874 | static int | |
1875 | st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
1876 | int dirtied) | |
1877 | { | |
1878 | int i; | |
1879 | ||
1880 | for (i=0; i < nr_pages; i++) { | |
b5810039 NP |
1881 | struct page *page = sgl[i].page; |
1882 | ||
b5810039 NP |
1883 | if (dirtied) |
1884 | SetPageDirty(page); | |
1885 | /* unlock_page(page); */ | |
1da177e4 LT |
1886 | /* FIXME: cache flush missing for rw==READ |
1887 | * FIXME: call the correct reference counting function | |
1888 | */ | |
b5810039 | 1889 | page_cache_release(page); |
1da177e4 LT |
1890 | } |
1891 | ||
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ | |
1896 | #endif | |
1897 | ||
1898 | ||
1899 | /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ | |
1900 | static int | |
1901 | sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) | |
1902 | { | |
1903 | #ifdef SG_ALLOW_DIO_CODE | |
1904 | sg_io_hdr_t *hp = &srp->header; | |
1905 | Sg_scatter_hold *schp = &srp->data; | |
1906 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1907 | struct scatterlist *sgl; | |
1908 | int mx_sc_elems, res; | |
1909 | struct scsi_device *sdev = sfp->parentdp->device; | |
1910 | ||
1911 | if (((unsigned long)hp->dxferp & | |
1912 | queue_dma_alignment(sdev->request_queue)) != 0) | |
1913 | return 1; | |
1914 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1915 | if (mx_sc_elems <= 0) { | |
1916 | return 1; | |
1917 | } | |
1918 | sgl = (struct scatterlist *)schp->buffer; | |
1919 | res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len, | |
1920 | (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX); | |
1921 | if (res <= 0) | |
1922 | return 1; | |
1923 | schp->k_use_sg = res; | |
1924 | schp->dio_in_use = 1; | |
1925 | hp->info |= SG_INFO_DIRECT_IO; | |
1926 | return 0; | |
1927 | #else | |
1928 | return 1; | |
1929 | #endif | |
1930 | } | |
1931 | ||
1932 | static int | |
1933 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1934 | { | |
1935 | int ret_sz; | |
1936 | int blk_size = buff_size; | |
1937 | unsigned char *p = NULL; | |
1938 | ||
1939 | if ((blk_size < 0) || (!sfp)) | |
1940 | return -EFAULT; | |
1941 | if (0 == blk_size) | |
1942 | ++blk_size; /* don't know why */ | |
1943 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ | |
1944 | blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); | |
1945 | SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1946 | buff_size, blk_size)); | |
1947 | if (blk_size <= SG_SCATTER_SZ) { | |
1948 | p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz); | |
1949 | if (!p) | |
1950 | return -ENOMEM; | |
1951 | if (blk_size == ret_sz) { /* got it on the first attempt */ | |
1952 | schp->k_use_sg = 0; | |
1953 | schp->buffer = p; | |
1954 | schp->bufflen = blk_size; | |
1955 | schp->b_malloc_len = blk_size; | |
1956 | return 0; | |
1957 | } | |
1958 | } else { | |
1959 | p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz); | |
1960 | if (!p) | |
1961 | return -ENOMEM; | |
1962 | } | |
1963 | /* Want some local declarations, so start new block ... */ | |
1964 | { /* lets try and build a scatter gather list */ | |
1965 | struct scatterlist *sclp; | |
1966 | int k, rem_sz, num; | |
1967 | int mx_sc_elems; | |
1968 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1969 | int first = 1; | |
1970 | ||
1971 | /* N.B. ret_sz carried into this block ... */ | |
1972 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1973 | if (mx_sc_elems < 0) | |
1974 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1975 | ||
1976 | for (k = 0, sclp = schp->buffer, rem_sz = blk_size; | |
1977 | (rem_sz > 0) && (k < mx_sc_elems); | |
1978 | ++k, rem_sz -= ret_sz, ++sclp) { | |
1979 | if (first) | |
1980 | first = 0; | |
1981 | else { | |
1982 | num = | |
1983 | (rem_sz > | |
1984 | SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; | |
1985 | p = sg_page_malloc(num, sfp->low_dma, &ret_sz); | |
1986 | if (!p) | |
1987 | break; | |
1988 | } | |
378f058c | 1989 | sg_set_buf(sclp, p, ret_sz); |
1da177e4 LT |
1990 | |
1991 | SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", | |
1992 | k, sg_scatg2virt(sclp), ret_sz)); | |
1993 | } /* end of for loop */ | |
1994 | schp->k_use_sg = k; | |
1995 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); | |
1996 | schp->bufflen = blk_size; | |
1997 | if (rem_sz > 0) /* must have failed */ | |
1998 | return -ENOMEM; | |
1999 | } | |
2000 | return 0; | |
2001 | } | |
2002 | ||
2003 | static int | |
2004 | sg_write_xfer(Sg_request * srp) | |
2005 | { | |
2006 | sg_io_hdr_t *hp = &srp->header; | |
2007 | Sg_scatter_hold *schp = &srp->data; | |
2008 | int num_xfer = 0; | |
2009 | int j, k, onum, usglen, ksglen, res; | |
2010 | int iovec_count = (int) hp->iovec_count; | |
2011 | int dxfer_dir = hp->dxfer_direction; | |
2012 | unsigned char *p; | |
2013 | unsigned char __user *up; | |
2014 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2015 | ||
2016 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || | |
2017 | (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2018 | num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); | |
2019 | if (schp->bufflen < num_xfer) | |
2020 | num_xfer = schp->bufflen; | |
2021 | } | |
2022 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2023 | (new_interface | |
2024 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2025 | return 0; | |
2026 | ||
2027 | SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2028 | num_xfer, iovec_count, schp->k_use_sg)); | |
2029 | if (iovec_count) { | |
2030 | onum = iovec_count; | |
2031 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2032 | return -EFAULT; | |
2033 | } else | |
2034 | onum = 1; | |
2035 | ||
2036 | if (0 == schp->k_use_sg) { /* kernel has single buffer */ | |
2037 | for (j = 0, p = schp->buffer; j < onum; ++j) { | |
2038 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
2039 | if (res) | |
2040 | return res; | |
2041 | usglen = (num_xfer > usglen) ? usglen : num_xfer; | |
2042 | if (__copy_from_user(p, up, usglen)) | |
2043 | return -EFAULT; | |
2044 | p += usglen; | |
2045 | num_xfer -= usglen; | |
2046 | if (num_xfer <= 0) | |
2047 | return 0; | |
2048 | } | |
2049 | } else { /* kernel using scatter gather list */ | |
2050 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2051 | ||
2052 | ksglen = (int) sclp->length; | |
2053 | p = sg_scatg2virt(sclp); | |
2054 | for (j = 0, k = 0; j < onum; ++j) { | |
2055 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
2056 | if (res) | |
2057 | return res; | |
2058 | ||
2059 | for (; p; ++sclp, ksglen = (int) sclp->length, | |
2060 | p = sg_scatg2virt(sclp)) { | |
2061 | if (usglen <= 0) | |
2062 | break; | |
2063 | if (ksglen > usglen) { | |
2064 | if (usglen >= num_xfer) { | |
2065 | if (__copy_from_user | |
2066 | (p, up, num_xfer)) | |
2067 | return -EFAULT; | |
2068 | return 0; | |
2069 | } | |
2070 | if (__copy_from_user(p, up, usglen)) | |
2071 | return -EFAULT; | |
2072 | p += usglen; | |
2073 | ksglen -= usglen; | |
2074 | break; | |
2075 | } else { | |
2076 | if (ksglen >= num_xfer) { | |
2077 | if (__copy_from_user | |
2078 | (p, up, num_xfer)) | |
2079 | return -EFAULT; | |
2080 | return 0; | |
2081 | } | |
2082 | if (__copy_from_user(p, up, ksglen)) | |
2083 | return -EFAULT; | |
2084 | up += ksglen; | |
2085 | usglen -= ksglen; | |
2086 | } | |
2087 | ++k; | |
2088 | if (k >= schp->k_use_sg) | |
2089 | return 0; | |
2090 | } | |
2091 | } | |
2092 | } | |
2093 | return 0; | |
2094 | } | |
2095 | ||
2096 | static int | |
2097 | sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
2098 | int wr_xf, int *countp, unsigned char __user **up) | |
2099 | { | |
2100 | int num_xfer = (int) hp->dxfer_len; | |
2101 | unsigned char __user *p = hp->dxferp; | |
2102 | int count; | |
2103 | ||
2104 | if (0 == sg_num) { | |
2105 | if (wr_xf && ('\0' == hp->interface_id)) | |
2106 | count = (int) hp->flags; /* holds "old" input_size */ | |
2107 | else | |
2108 | count = num_xfer; | |
2109 | } else { | |
2110 | sg_iovec_t iovec; | |
2111 | if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) | |
2112 | return -EFAULT; | |
2113 | p = iovec.iov_base; | |
2114 | count = (int) iovec.iov_len; | |
2115 | } | |
2116 | if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) | |
2117 | return -EFAULT; | |
2118 | if (up) | |
2119 | *up = p; | |
2120 | if (countp) | |
2121 | *countp = count; | |
2122 | return 0; | |
2123 | } | |
2124 | ||
2125 | static void | |
2126 | sg_remove_scat(Sg_scatter_hold * schp) | |
2127 | { | |
2128 | SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
2129 | if (schp->buffer && (schp->sglist_len > 0)) { | |
2130 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2131 | ||
2132 | if (schp->dio_in_use) { | |
2133 | #ifdef SG_ALLOW_DIO_CODE | |
2134 | st_unmap_user_pages(sclp, schp->k_use_sg, TRUE); | |
2135 | #endif | |
2136 | } else { | |
2137 | int k; | |
2138 | ||
2139 | for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); | |
2140 | ++k, ++sclp) { | |
2141 | SCSI_LOG_TIMEOUT(5, printk( | |
2142 | "sg_remove_scat: k=%d, a=0x%p, len=%d\n", | |
2143 | k, sg_scatg2virt(sclp), sclp->length)); | |
2144 | sg_page_free(sg_scatg2virt(sclp), sclp->length); | |
2145 | sclp->page = NULL; | |
2146 | sclp->offset = 0; | |
2147 | sclp->length = 0; | |
2148 | } | |
2149 | } | |
2150 | sg_page_free(schp->buffer, schp->sglist_len); | |
2151 | } else if (schp->buffer) | |
2152 | sg_page_free(schp->buffer, schp->b_malloc_len); | |
2153 | memset(schp, 0, sizeof (*schp)); | |
2154 | } | |
2155 | ||
2156 | static int | |
2157 | sg_read_xfer(Sg_request * srp) | |
2158 | { | |
2159 | sg_io_hdr_t *hp = &srp->header; | |
2160 | Sg_scatter_hold *schp = &srp->data; | |
2161 | int num_xfer = 0; | |
2162 | int j, k, onum, usglen, ksglen, res; | |
2163 | int iovec_count = (int) hp->iovec_count; | |
2164 | int dxfer_dir = hp->dxfer_direction; | |
2165 | unsigned char *p; | |
2166 | unsigned char __user *up; | |
2167 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2168 | ||
2169 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) | |
2170 | || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2171 | num_xfer = hp->dxfer_len; | |
2172 | if (schp->bufflen < num_xfer) | |
2173 | num_xfer = schp->bufflen; | |
2174 | } | |
2175 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2176 | (new_interface | |
2177 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2178 | return 0; | |
2179 | ||
2180 | SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2181 | num_xfer, iovec_count, schp->k_use_sg)); | |
2182 | if (iovec_count) { | |
2183 | onum = iovec_count; | |
2184 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2185 | return -EFAULT; | |
2186 | } else | |
2187 | onum = 1; | |
2188 | ||
2189 | if (0 == schp->k_use_sg) { /* kernel has single buffer */ | |
2190 | for (j = 0, p = schp->buffer; j < onum; ++j) { | |
2191 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2192 | if (res) | |
2193 | return res; | |
2194 | usglen = (num_xfer > usglen) ? usglen : num_xfer; | |
2195 | if (__copy_to_user(up, p, usglen)) | |
2196 | return -EFAULT; | |
2197 | p += usglen; | |
2198 | num_xfer -= usglen; | |
2199 | if (num_xfer <= 0) | |
2200 | return 0; | |
2201 | } | |
2202 | } else { /* kernel using scatter gather list */ | |
2203 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2204 | ||
2205 | ksglen = (int) sclp->length; | |
2206 | p = sg_scatg2virt(sclp); | |
2207 | for (j = 0, k = 0; j < onum; ++j) { | |
2208 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2209 | if (res) | |
2210 | return res; | |
2211 | ||
2212 | for (; p; ++sclp, ksglen = (int) sclp->length, | |
2213 | p = sg_scatg2virt(sclp)) { | |
2214 | if (usglen <= 0) | |
2215 | break; | |
2216 | if (ksglen > usglen) { | |
2217 | if (usglen >= num_xfer) { | |
2218 | if (__copy_to_user | |
2219 | (up, p, num_xfer)) | |
2220 | return -EFAULT; | |
2221 | return 0; | |
2222 | } | |
2223 | if (__copy_to_user(up, p, usglen)) | |
2224 | return -EFAULT; | |
2225 | p += usglen; | |
2226 | ksglen -= usglen; | |
2227 | break; | |
2228 | } else { | |
2229 | if (ksglen >= num_xfer) { | |
2230 | if (__copy_to_user | |
2231 | (up, p, num_xfer)) | |
2232 | return -EFAULT; | |
2233 | return 0; | |
2234 | } | |
2235 | if (__copy_to_user(up, p, ksglen)) | |
2236 | return -EFAULT; | |
2237 | up += ksglen; | |
2238 | usglen -= ksglen; | |
2239 | } | |
2240 | ++k; | |
2241 | if (k >= schp->k_use_sg) | |
2242 | return 0; | |
2243 | } | |
2244 | } | |
2245 | } | |
2246 | return 0; | |
2247 | } | |
2248 | ||
2249 | static int | |
2250 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
2251 | { | |
2252 | Sg_scatter_hold *schp = &srp->data; | |
2253 | ||
2254 | SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", | |
2255 | num_read_xfer)); | |
2256 | if ((!outp) || (num_read_xfer <= 0)) | |
2257 | return 0; | |
2258 | if (schp->k_use_sg > 0) { | |
2259 | int k, num; | |
2260 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2261 | ||
2262 | for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); | |
2263 | ++k, ++sclp) { | |
2264 | num = (int) sclp->length; | |
2265 | if (num > num_read_xfer) { | |
2266 | if (__copy_to_user | |
2267 | (outp, sg_scatg2virt(sclp), num_read_xfer)) | |
2268 | return -EFAULT; | |
2269 | break; | |
2270 | } else { | |
2271 | if (__copy_to_user | |
2272 | (outp, sg_scatg2virt(sclp), num)) | |
2273 | return -EFAULT; | |
2274 | num_read_xfer -= num; | |
2275 | if (num_read_xfer <= 0) | |
2276 | break; | |
2277 | outp += num; | |
2278 | } | |
2279 | } | |
2280 | } else { | |
2281 | if (__copy_to_user(outp, schp->buffer, num_read_xfer)) | |
2282 | return -EFAULT; | |
2283 | } | |
2284 | return 0; | |
2285 | } | |
2286 | ||
2287 | static void | |
2288 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2289 | { | |
2290 | Sg_scatter_hold *schp = &sfp->reserve; | |
2291 | ||
2292 | SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); | |
2293 | do { | |
2294 | if (req_size < PAGE_SIZE) | |
2295 | req_size = PAGE_SIZE; | |
2296 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2297 | return; | |
2298 | else | |
2299 | sg_remove_scat(schp); | |
2300 | req_size >>= 1; /* divide by 2 */ | |
2301 | } while (req_size > (PAGE_SIZE / 2)); | |
2302 | } | |
2303 | ||
2304 | static void | |
2305 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2306 | { | |
2307 | Sg_scatter_hold *req_schp = &srp->data; | |
2308 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2309 | ||
2310 | srp->res_used = 1; | |
2311 | SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); | |
2312 | size = (size + 1) & (~1); /* round to even for aha1542 */ | |
2313 | if (rsv_schp->k_use_sg > 0) { | |
2314 | int k, num; | |
2315 | int rem = size; | |
2316 | struct scatterlist *sclp = | |
2317 | (struct scatterlist *) rsv_schp->buffer; | |
2318 | ||
2319 | for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) { | |
2320 | num = (int) sclp->length; | |
2321 | if (rem <= num) { | |
2322 | if (0 == k) { | |
2323 | req_schp->k_use_sg = 0; | |
2324 | req_schp->buffer = sg_scatg2virt(sclp); | |
2325 | } else { | |
2326 | sfp->save_scat_len = num; | |
2327 | sclp->length = (unsigned) rem; | |
2328 | req_schp->k_use_sg = k + 1; | |
2329 | req_schp->sglist_len = | |
2330 | rsv_schp->sglist_len; | |
2331 | req_schp->buffer = rsv_schp->buffer; | |
2332 | } | |
2333 | req_schp->bufflen = size; | |
2334 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2335 | break; | |
2336 | } else | |
2337 | rem -= num; | |
2338 | } | |
2339 | if (k >= rsv_schp->k_use_sg) | |
2340 | SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); | |
2341 | } else { | |
2342 | req_schp->k_use_sg = 0; | |
2343 | req_schp->bufflen = size; | |
2344 | req_schp->buffer = rsv_schp->buffer; | |
2345 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2346 | } | |
2347 | } | |
2348 | ||
2349 | static void | |
2350 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2351 | { | |
2352 | Sg_scatter_hold *req_schp = &srp->data; | |
2353 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2354 | ||
2355 | SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", | |
2356 | (int) req_schp->k_use_sg)); | |
2357 | if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { | |
2358 | struct scatterlist *sclp = | |
2359 | (struct scatterlist *) rsv_schp->buffer; | |
2360 | ||
2361 | if (sfp->save_scat_len > 0) | |
2362 | (sclp + (req_schp->k_use_sg - 1))->length = | |
2363 | (unsigned) sfp->save_scat_len; | |
2364 | else | |
2365 | SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); | |
2366 | } | |
2367 | req_schp->k_use_sg = 0; | |
2368 | req_schp->bufflen = 0; | |
2369 | req_schp->buffer = NULL; | |
2370 | req_schp->sglist_len = 0; | |
2371 | sfp->save_scat_len = 0; | |
2372 | srp->res_used = 0; | |
2373 | } | |
2374 | ||
2375 | static Sg_request * | |
2376 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2377 | { | |
2378 | Sg_request *resp; | |
2379 | unsigned long iflags; | |
2380 | ||
2381 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2382 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2383 | /* look for requests that are ready + not SG_IO owned */ | |
2384 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2385 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2386 | resp->done = 2; /* guard against other readers */ | |
2387 | break; | |
2388 | } | |
2389 | } | |
2390 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2391 | return resp; | |
2392 | } | |
2393 | ||
2394 | #ifdef CONFIG_SCSI_PROC_FS | |
2395 | static Sg_request * | |
2396 | sg_get_nth_request(Sg_fd * sfp, int nth) | |
2397 | { | |
2398 | Sg_request *resp; | |
2399 | unsigned long iflags; | |
2400 | int k; | |
2401 | ||
2402 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2403 | for (k = 0, resp = sfp->headrp; resp && (k < nth); | |
2404 | ++k, resp = resp->nextrp) ; | |
2405 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2406 | return resp; | |
2407 | } | |
2408 | #endif | |
2409 | ||
2410 | /* always adds to end of list */ | |
2411 | static Sg_request * | |
2412 | sg_add_request(Sg_fd * sfp) | |
2413 | { | |
2414 | int k; | |
2415 | unsigned long iflags; | |
2416 | Sg_request *resp; | |
2417 | Sg_request *rp = sfp->req_arr; | |
2418 | ||
2419 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2420 | resp = sfp->headrp; | |
2421 | if (!resp) { | |
2422 | memset(rp, 0, sizeof (Sg_request)); | |
2423 | rp->parentfp = sfp; | |
2424 | resp = rp; | |
2425 | sfp->headrp = resp; | |
2426 | } else { | |
2427 | if (0 == sfp->cmd_q) | |
2428 | resp = NULL; /* command queuing disallowed */ | |
2429 | else { | |
2430 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2431 | if (!rp->parentfp) | |
2432 | break; | |
2433 | } | |
2434 | if (k < SG_MAX_QUEUE) { | |
2435 | memset(rp, 0, sizeof (Sg_request)); | |
2436 | rp->parentfp = sfp; | |
2437 | while (resp->nextrp) | |
2438 | resp = resp->nextrp; | |
2439 | resp->nextrp = rp; | |
2440 | resp = rp; | |
2441 | } else | |
2442 | resp = NULL; | |
2443 | } | |
2444 | } | |
2445 | if (resp) { | |
2446 | resp->nextrp = NULL; | |
cb59e840 | 2447 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
2448 | resp->my_cmdp = NULL; |
2449 | } | |
2450 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2451 | return resp; | |
2452 | } | |
2453 | ||
2454 | /* Return of 1 for found; 0 for not found */ | |
2455 | static int | |
2456 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2457 | { | |
2458 | Sg_request *prev_rp; | |
2459 | Sg_request *rp; | |
2460 | unsigned long iflags; | |
2461 | int res = 0; | |
2462 | ||
2463 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2464 | return res; | |
2465 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
521314c1 BK |
2466 | if (srp->my_cmdp) |
2467 | srp->my_cmdp->upper_private_data = NULL; | |
1da177e4 LT |
2468 | prev_rp = sfp->headrp; |
2469 | if (srp == prev_rp) { | |
2470 | sfp->headrp = prev_rp->nextrp; | |
2471 | prev_rp->parentfp = NULL; | |
2472 | res = 1; | |
2473 | } else { | |
2474 | while ((rp = prev_rp->nextrp)) { | |
2475 | if (srp == rp) { | |
2476 | prev_rp->nextrp = rp->nextrp; | |
2477 | rp->parentfp = NULL; | |
2478 | res = 1; | |
2479 | break; | |
2480 | } | |
2481 | prev_rp = rp; | |
2482 | } | |
2483 | } | |
2484 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2485 | return res; | |
2486 | } | |
2487 | ||
2488 | #ifdef CONFIG_SCSI_PROC_FS | |
2489 | static Sg_fd * | |
2490 | sg_get_nth_sfp(Sg_device * sdp, int nth) | |
2491 | { | |
2492 | Sg_fd *resp; | |
2493 | unsigned long iflags; | |
2494 | int k; | |
2495 | ||
2496 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2497 | for (k = 0, resp = sdp->headfp; resp && (k < nth); | |
2498 | ++k, resp = resp->nextfp) ; | |
2499 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2500 | return resp; | |
2501 | } | |
2502 | #endif | |
2503 | ||
2504 | static Sg_fd * | |
2505 | sg_add_sfp(Sg_device * sdp, int dev) | |
2506 | { | |
2507 | Sg_fd *sfp; | |
2508 | unsigned long iflags; | |
2509 | ||
2510 | sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL); | |
2511 | if (!sfp) | |
2512 | return NULL; | |
2513 | memset(sfp, 0, sizeof (Sg_fd)); | |
2514 | init_waitqueue_head(&sfp->read_wait); | |
2515 | rwlock_init(&sfp->rq_list_lock); | |
2516 | ||
2517 | sfp->timeout = SG_DEFAULT_TIMEOUT; | |
2518 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2519 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2520 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2521 | sdp->device->host->unchecked_isa_dma : 1; | |
2522 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2523 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2524 | sfp->parentdp = sdp; | |
2525 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2526 | if (!sdp->headfp) | |
2527 | sdp->headfp = sfp; | |
2528 | else { /* add to tail of existing list */ | |
2529 | Sg_fd *pfp = sdp->headfp; | |
2530 | while (pfp->nextfp) | |
2531 | pfp = pfp->nextfp; | |
2532 | pfp->nextfp = sfp; | |
2533 | } | |
2534 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2535 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); | |
2536 | sg_build_reserve(sfp, sg_big_buff); | |
2537 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", | |
2538 | sfp->reserve.bufflen, sfp->reserve.k_use_sg)); | |
2539 | return sfp; | |
2540 | } | |
2541 | ||
2542 | static void | |
2543 | __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2544 | { | |
2545 | Sg_fd *fp; | |
2546 | Sg_fd *prev_fp; | |
2547 | ||
2548 | prev_fp = sdp->headfp; | |
2549 | if (sfp == prev_fp) | |
2550 | sdp->headfp = prev_fp->nextfp; | |
2551 | else { | |
2552 | while ((fp = prev_fp->nextfp)) { | |
2553 | if (sfp == fp) { | |
2554 | prev_fp->nextfp = fp->nextfp; | |
2555 | break; | |
2556 | } | |
2557 | prev_fp = fp; | |
2558 | } | |
2559 | } | |
2560 | if (sfp->reserve.bufflen > 0) { | |
2561 | SCSI_LOG_TIMEOUT(6, | |
2562 | printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2563 | (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); | |
2564 | if (sfp->mmap_called) | |
2565 | sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */ | |
2566 | sg_remove_scat(&sfp->reserve); | |
2567 | } | |
2568 | sfp->parentdp = NULL; | |
2569 | SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); | |
2570 | sg_page_free((char *) sfp, sizeof (Sg_fd)); | |
2571 | } | |
2572 | ||
2573 | /* Returns 0 in normal case, 1 when detached and sdp object removed */ | |
2574 | static int | |
2575 | sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2576 | { | |
2577 | Sg_request *srp; | |
2578 | Sg_request *tsrp; | |
2579 | int dirty = 0; | |
2580 | int res = 0; | |
2581 | ||
2582 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
2583 | tsrp = srp->nextrp; | |
2584 | if (sg_srp_done(srp, sfp)) | |
2585 | sg_finish_rem_req(srp); | |
2586 | else | |
2587 | ++dirty; | |
2588 | } | |
2589 | if (0 == dirty) { | |
2590 | unsigned long iflags; | |
2591 | ||
2592 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2593 | __sg_remove_sfp(sdp, sfp); | |
2594 | if (sdp->detached && (NULL == sdp->headfp)) { | |
2595 | int k, maxd; | |
2596 | ||
2597 | maxd = sg_dev_max; | |
2598 | for (k = 0; k < maxd; ++k) { | |
2599 | if (sdp == sg_dev_arr[k]) | |
2600 | break; | |
2601 | } | |
2602 | if (k < maxd) | |
2603 | sg_dev_arr[k] = NULL; | |
2604 | kfree((char *) sdp); | |
2605 | res = 1; | |
2606 | } | |
2607 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2608 | } else { | |
2609 | /* MOD_INC's to inhibit unloading sg and associated adapter driver */ | |
2610 | /* only bump the access_count if we actually succeeded in | |
2611 | * throwing another counter on the host module */ | |
2612 | scsi_device_get(sdp->device); /* XXX: retval ignored? */ | |
2613 | sfp->closed = 1; /* flag dirty state on this fd */ | |
2614 | SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", | |
2615 | dirty)); | |
2616 | } | |
2617 | return res; | |
2618 | } | |
2619 | ||
2620 | static int | |
2621 | sg_res_in_use(Sg_fd * sfp) | |
2622 | { | |
2623 | const Sg_request *srp; | |
2624 | unsigned long iflags; | |
2625 | ||
2626 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2627 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2628 | if (srp->res_used) | |
2629 | break; | |
2630 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2631 | return srp ? 1 : 0; | |
2632 | } | |
2633 | ||
2634 | /* If retSzp==NULL want exact size or fail */ | |
2635 | static char * | |
2636 | sg_page_malloc(int rqSz, int lowDma, int *retSzp) | |
2637 | { | |
2638 | char *resp = NULL; | |
c53033f6 | 2639 | gfp_t page_mask; |
1da177e4 LT |
2640 | int order, a_size; |
2641 | int resSz = rqSz; | |
2642 | ||
2643 | if (rqSz <= 0) | |
2644 | return resp; | |
2645 | ||
2646 | if (lowDma) | |
2647 | page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN; | |
2648 | else | |
2649 | page_mask = GFP_ATOMIC | __GFP_NOWARN; | |
2650 | ||
2651 | for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; | |
2652 | order++, a_size <<= 1) ; | |
2653 | resp = (char *) __get_free_pages(page_mask, order); | |
2654 | while ((!resp) && order && retSzp) { | |
2655 | --order; | |
2656 | a_size >>= 1; /* divide by 2, until PAGE_SIZE */ | |
2657 | resp = (char *) __get_free_pages(page_mask, order); /* try half */ | |
2658 | resSz = a_size; | |
2659 | } | |
2660 | if (resp) { | |
2661 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2662 | memset(resp, 0, resSz); | |
2663 | if (retSzp) | |
2664 | *retSzp = resSz; | |
2665 | } | |
2666 | return resp; | |
2667 | } | |
2668 | ||
2669 | static void | |
2670 | sg_page_free(char *buff, int size) | |
2671 | { | |
2672 | int order, a_size; | |
2673 | ||
2674 | if (!buff) | |
2675 | return; | |
2676 | for (order = 0, a_size = PAGE_SIZE; a_size < size; | |
2677 | order++, a_size <<= 1) ; | |
2678 | free_pages((unsigned long) buff, order); | |
2679 | } | |
2680 | ||
2681 | #ifndef MAINTENANCE_IN_CMD | |
2682 | #define MAINTENANCE_IN_CMD 0xa3 | |
2683 | #endif | |
2684 | ||
2685 | static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, | |
2686 | INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, | |
2687 | READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, | |
2688 | SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD | |
2689 | }; | |
2690 | ||
2691 | static int | |
2692 | sg_allow_access(unsigned char opcode, char dev_type) | |
2693 | { | |
2694 | int k; | |
2695 | ||
2696 | if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ | |
2697 | return 1; | |
2698 | for (k = 0; k < sizeof (allow_ops); ++k) { | |
2699 | if (opcode == allow_ops[k]) | |
2700 | return 1; | |
2701 | } | |
2702 | return 0; | |
2703 | } | |
2704 | ||
2705 | #ifdef CONFIG_SCSI_PROC_FS | |
2706 | static int | |
2707 | sg_last_dev(void) | |
2708 | { | |
2709 | int k; | |
2710 | unsigned long iflags; | |
2711 | ||
2712 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2713 | for (k = sg_dev_max - 1; k >= 0; --k) | |
2714 | if (sg_dev_arr[k] && sg_dev_arr[k]->device) | |
2715 | break; | |
2716 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2717 | return k + 1; /* origin 1 */ | |
2718 | } | |
2719 | #endif | |
2720 | ||
2721 | static Sg_device * | |
2722 | sg_get_dev(int dev) | |
2723 | { | |
2724 | Sg_device *sdp = NULL; | |
2725 | unsigned long iflags; | |
2726 | ||
2727 | if (sg_dev_arr && (dev >= 0)) { | |
2728 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2729 | if (dev < sg_dev_max) | |
2730 | sdp = sg_dev_arr[dev]; | |
2731 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2732 | } | |
2733 | return sdp; | |
2734 | } | |
2735 | ||
2736 | #ifdef CONFIG_SCSI_PROC_FS | |
2737 | ||
2738 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2739 | ||
2740 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2741 | ||
2742 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2743 | ||
2744 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2745 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2746 | size_t count, loff_t *off); | |
2747 | static struct file_operations adio_fops = { | |
2748 | /* .owner, .read and .llseek added in sg_proc_init() */ | |
2749 | .open = sg_proc_single_open_adio, | |
2750 | .write = sg_proc_write_adio, | |
2751 | .release = single_release, | |
2752 | }; | |
2753 | ||
2754 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2755 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2756 | const char __user *buffer, size_t count, loff_t *off); | |
2757 | static struct file_operations dressz_fops = { | |
2758 | .open = sg_proc_single_open_dressz, | |
2759 | .write = sg_proc_write_dressz, | |
2760 | .release = single_release, | |
2761 | }; | |
2762 | ||
2763 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2764 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
2765 | static struct file_operations version_fops = { | |
2766 | .open = sg_proc_single_open_version, | |
2767 | .release = single_release, | |
2768 | }; | |
2769 | ||
2770 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2771 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
2772 | static struct file_operations devhdr_fops = { | |
2773 | .open = sg_proc_single_open_devhdr, | |
2774 | .release = single_release, | |
2775 | }; | |
2776 | ||
2777 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2778 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2779 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2780 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2781 | static void dev_seq_stop(struct seq_file *s, void *v); | |
2782 | static struct file_operations dev_fops = { | |
2783 | .open = sg_proc_open_dev, | |
2784 | .release = seq_release, | |
2785 | }; | |
2786 | static struct seq_operations dev_seq_ops = { | |
2787 | .start = dev_seq_start, | |
2788 | .next = dev_seq_next, | |
2789 | .stop = dev_seq_stop, | |
2790 | .show = sg_proc_seq_show_dev, | |
2791 | }; | |
2792 | ||
2793 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2794 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
2795 | static struct file_operations devstrs_fops = { | |
2796 | .open = sg_proc_open_devstrs, | |
2797 | .release = seq_release, | |
2798 | }; | |
2799 | static struct seq_operations devstrs_seq_ops = { | |
2800 | .start = dev_seq_start, | |
2801 | .next = dev_seq_next, | |
2802 | .stop = dev_seq_stop, | |
2803 | .show = sg_proc_seq_show_devstrs, | |
2804 | }; | |
2805 | ||
2806 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2807 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
2808 | static struct file_operations debug_fops = { | |
2809 | .open = sg_proc_open_debug, | |
2810 | .release = seq_release, | |
2811 | }; | |
2812 | static struct seq_operations debug_seq_ops = { | |
2813 | .start = dev_seq_start, | |
2814 | .next = dev_seq_next, | |
2815 | .stop = dev_seq_stop, | |
2816 | .show = sg_proc_seq_show_debug, | |
2817 | }; | |
2818 | ||
2819 | ||
2820 | struct sg_proc_leaf { | |
2821 | const char * name; | |
2822 | struct file_operations * fops; | |
2823 | }; | |
2824 | ||
2825 | static struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2826 | {"allow_dio", &adio_fops}, | |
2827 | {"debug", &debug_fops}, | |
2828 | {"def_reserved_size", &dressz_fops}, | |
2829 | {"device_hdr", &devhdr_fops}, | |
2830 | {"devices", &dev_fops}, | |
2831 | {"device_strs", &devstrs_fops}, | |
2832 | {"version", &version_fops} | |
2833 | }; | |
2834 | ||
2835 | static int | |
2836 | sg_proc_init(void) | |
2837 | { | |
2838 | int k, mask; | |
2839 | int num_leaves = | |
2840 | sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); | |
2841 | struct proc_dir_entry *pdep; | |
2842 | struct sg_proc_leaf * leaf; | |
2843 | ||
66600221 | 2844 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2845 | if (!sg_proc_sgp) |
2846 | return 1; | |
2847 | for (k = 0; k < num_leaves; ++k) { | |
2848 | leaf = &sg_proc_leaf_arr[k]; | |
2849 | mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
2850 | pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); | |
2851 | if (pdep) { | |
2852 | leaf->fops->owner = THIS_MODULE, | |
2853 | leaf->fops->read = seq_read, | |
2854 | leaf->fops->llseek = seq_lseek, | |
2855 | pdep->proc_fops = leaf->fops; | |
2856 | } | |
2857 | } | |
2858 | return 0; | |
2859 | } | |
2860 | ||
2861 | static void | |
2862 | sg_proc_cleanup(void) | |
2863 | { | |
2864 | int k; | |
2865 | int num_leaves = | |
2866 | sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); | |
2867 | ||
2868 | if (!sg_proc_sgp) | |
2869 | return; | |
2870 | for (k = 0; k < num_leaves; ++k) | |
2871 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2872 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2873 | } | |
2874 | ||
2875 | ||
2876 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2877 | { | |
2878 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2879 | return 0; | |
2880 | } | |
2881 | ||
2882 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2883 | { | |
2884 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2885 | } | |
2886 | ||
2887 | static ssize_t | |
2888 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2889 | size_t count, loff_t *off) | |
2890 | { | |
2891 | int num; | |
2892 | char buff[11]; | |
2893 | ||
2894 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2895 | return -EACCES; | |
2896 | num = (count < 10) ? count : 10; | |
2897 | if (copy_from_user(buff, buffer, num)) | |
2898 | return -EFAULT; | |
2899 | buff[num] = '\0'; | |
2900 | sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; | |
2901 | return count; | |
2902 | } | |
2903 | ||
2904 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2905 | { | |
2906 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2907 | } | |
2908 | ||
2909 | static ssize_t | |
2910 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2911 | size_t count, loff_t *off) | |
2912 | { | |
2913 | int num; | |
2914 | unsigned long k = ULONG_MAX; | |
2915 | char buff[11]; | |
2916 | ||
2917 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2918 | return -EACCES; | |
2919 | num = (count < 10) ? count : 10; | |
2920 | if (copy_from_user(buff, buffer, num)) | |
2921 | return -EFAULT; | |
2922 | buff[num] = '\0'; | |
2923 | k = simple_strtoul(buff, NULL, 10); | |
2924 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2925 | sg_big_buff = k; | |
2926 | return count; | |
2927 | } | |
2928 | return -ERANGE; | |
2929 | } | |
2930 | ||
2931 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2932 | { | |
2933 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2934 | sg_version_date); | |
2935 | return 0; | |
2936 | } | |
2937 | ||
2938 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2939 | { | |
2940 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2941 | } | |
2942 | ||
2943 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2944 | { | |
2945 | seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" | |
2946 | "online\n"); | |
2947 | return 0; | |
2948 | } | |
2949 | ||
2950 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2951 | { | |
2952 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2953 | } | |
2954 | ||
2955 | struct sg_proc_deviter { | |
2956 | loff_t index; | |
2957 | size_t max; | |
2958 | }; | |
2959 | ||
2960 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2961 | { | |
2962 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2963 | ||
729d70f5 | 2964 | s->private = it; |
1da177e4 LT |
2965 | if (! it) |
2966 | return NULL; | |
729d70f5 | 2967 | |
1da177e4 | 2968 | if (NULL == sg_dev_arr) |
729d70f5 | 2969 | return NULL; |
1da177e4 LT |
2970 | it->index = *pos; |
2971 | it->max = sg_last_dev(); | |
2972 | if (it->index >= it->max) | |
729d70f5 | 2973 | return NULL; |
1da177e4 | 2974 | return it; |
1da177e4 LT |
2975 | } |
2976 | ||
2977 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2978 | { | |
729d70f5 | 2979 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2980 | |
2981 | *pos = ++it->index; | |
2982 | return (it->index < it->max) ? it : NULL; | |
2983 | } | |
2984 | ||
2985 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2986 | { | |
729d70f5 | 2987 | kfree(s->private); |
1da177e4 LT |
2988 | } |
2989 | ||
2990 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
2991 | { | |
2992 | return seq_open(file, &dev_seq_ops); | |
2993 | } | |
2994 | ||
2995 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
2996 | { | |
2997 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
2998 | Sg_device *sdp; | |
2999 | struct scsi_device *scsidp; | |
3000 | ||
3001 | sdp = it ? sg_get_dev(it->index) : NULL; | |
3002 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
3003 | seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", | |
3004 | scsidp->host->host_no, scsidp->channel, | |
3005 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
3006 | 1, | |
3007 | (int) scsidp->queue_depth, | |
3008 | (int) scsidp->device_busy, | |
3009 | (int) scsi_device_online(scsidp)); | |
3010 | else | |
3011 | seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
3012 | return 0; | |
3013 | } | |
3014 | ||
3015 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
3016 | { | |
3017 | return seq_open(file, &devstrs_seq_ops); | |
3018 | } | |
3019 | ||
3020 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
3021 | { | |
3022 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
3023 | Sg_device *sdp; | |
3024 | struct scsi_device *scsidp; | |
3025 | ||
3026 | sdp = it ? sg_get_dev(it->index) : NULL; | |
3027 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
3028 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
3029 | scsidp->vendor, scsidp->model, scsidp->rev); | |
3030 | else | |
3031 | seq_printf(s, "<no active device>\n"); | |
3032 | return 0; | |
3033 | } | |
3034 | ||
3035 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) | |
3036 | { | |
3037 | int k, m, new_interface, blen, usg; | |
3038 | Sg_request *srp; | |
3039 | Sg_fd *fp; | |
3040 | const sg_io_hdr_t *hp; | |
3041 | const char * cp; | |
cb59e840 | 3042 | unsigned int ms; |
1da177e4 LT |
3043 | |
3044 | for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { | |
3045 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " | |
3046 | "(res)sgat=%d low_dma=%d\n", k + 1, | |
3047 | jiffies_to_msecs(fp->timeout), | |
3048 | fp->reserve.bufflen, | |
3049 | (int) fp->reserve.k_use_sg, | |
3050 | (int) fp->low_dma); | |
3051 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", | |
3052 | (int) fp->cmd_q, (int) fp->force_packid, | |
3053 | (int) fp->keep_orphan, (int) fp->closed); | |
3054 | for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { | |
3055 | hp = &srp->header; | |
3056 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
3057 | if (srp->res_used) { | |
3058 | if (new_interface && | |
3059 | (SG_FLAG_MMAP_IO & hp->flags)) | |
3060 | cp = " mmap>> "; | |
3061 | else | |
3062 | cp = " rb>> "; | |
3063 | } else { | |
3064 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
3065 | cp = " dio>> "; | |
3066 | else | |
3067 | cp = " "; | |
3068 | } | |
3069 | seq_printf(s, cp); | |
3070 | blen = srp->my_cmdp ? | |
3071 | srp->my_cmdp->sr_bufflen : srp->data.bufflen; | |
3072 | usg = srp->my_cmdp ? | |
3073 | srp->my_cmdp->sr_use_sg : srp->data.k_use_sg; | |
3074 | seq_printf(s, srp->done ? | |
3075 | ((1 == srp->done) ? "rcv:" : "fin:") | |
3076 | : (srp->my_cmdp ? "act:" : "prior:")); | |
3077 | seq_printf(s, " id=%d blen=%d", | |
3078 | srp->header.pack_id, blen); | |
3079 | if (srp->done) | |
3080 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 DG |
3081 | else { |
3082 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 3083 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 DG |
3084 | (new_interface ? hp->timeout : |
3085 | jiffies_to_msecs(fp->timeout)), | |
3086 | (ms > hp->duration ? ms - hp->duration : 0)); | |
3087 | } | |
1da177e4 LT |
3088 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
3089 | (int) srp->data.cmd_opcode); | |
3090 | } | |
3091 | if (0 == m) | |
3092 | seq_printf(s, " No requests active\n"); | |
3093 | } | |
3094 | } | |
3095 | ||
3096 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
3097 | { | |
3098 | return seq_open(file, &debug_seq_ops); | |
3099 | } | |
3100 | ||
3101 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
3102 | { | |
3103 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
3104 | Sg_device *sdp; | |
3105 | ||
3106 | if (it && (0 == it->index)) { | |
3107 | seq_printf(s, "dev_max(currently)=%d max_active_device=%d " | |
3108 | "(origin 1)\n", sg_dev_max, (int)it->max); | |
3109 | seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); | |
3110 | } | |
3111 | sdp = it ? sg_get_dev(it->index) : NULL; | |
3112 | if (sdp) { | |
3113 | struct scsi_device *scsidp = sdp->device; | |
3114 | ||
3115 | if (NULL == scsidp) { | |
3116 | seq_printf(s, "device %d detached ??\n", | |
3117 | (int)it->index); | |
3118 | return 0; | |
3119 | } | |
3120 | ||
3121 | if (sg_get_nth_sfp(sdp, 0)) { | |
3122 | seq_printf(s, " >>> device=%s ", | |
3123 | sdp->disk->disk_name); | |
3124 | if (sdp->detached) | |
3125 | seq_printf(s, "detached pending close "); | |
3126 | else | |
3127 | seq_printf | |
3128 | (s, "scsi%d chan=%d id=%d lun=%d em=%d", | |
3129 | scsidp->host->host_no, | |
3130 | scsidp->channel, scsidp->id, | |
3131 | scsidp->lun, | |
3132 | scsidp->host->hostt->emulated); | |
3133 | seq_printf(s, " sg_tablesize=%d excl=%d\n", | |
3134 | sdp->sg_tablesize, sdp->exclude); | |
3135 | } | |
3136 | sg_proc_debug_helper(s, sdp); | |
3137 | } | |
3138 | return 0; | |
3139 | } | |
3140 | ||
3141 | #endif /* CONFIG_SCSI_PROC_FS */ | |
3142 | ||
3143 | module_init(init_sg); | |
3144 | module_exit(exit_sg); | |
3145 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |