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1da177e4 LT |
1 | /* |
2 | * History: | |
3 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), | |
4 | * to allow user process control of SCSI devices. | |
5 | * Development Sponsored by Killy Corp. NY NY | |
6 | * | |
7 | * Original driver (sg.c): | |
8 | * Copyright (C) 1992 Lawrence Foard | |
9 | * Version 2 and 3 extensions to driver: | |
10 | * Copyright (C) 1998 - 2005 Douglas Gilbert | |
11 | * | |
12 | * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | ||
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> | |
52 | ||
53 | #include "scsi.h" | |
db9dff36 | 54 | #include <scsi/scsi_dbg.h> |
1da177e4 LT |
55 | #include <scsi/scsi_host.h> |
56 | #include <scsi/scsi_driver.h> | |
57 | #include <scsi/scsi_ioctl.h> | |
58 | #include <scsi/sg.h> | |
59 | ||
60 | #include "scsi_logging.h" | |
61 | ||
62 | #ifdef CONFIG_SCSI_PROC_FS | |
63 | #include <linux/proc_fs.h> | |
1c8e71d7 | 64 | static char *sg_version_date = "20050908"; |
1da177e4 LT |
65 | |
66 | static int sg_proc_init(void); | |
67 | static void sg_proc_cleanup(void); | |
68 | #endif | |
69 | ||
70 | #ifndef LINUX_VERSION_CODE | |
71 | #include <linux/version.h> | |
72 | #endif /* LINUX_VERSION_CODE */ | |
73 | ||
74 | #define SG_ALLOW_DIO_DEF 0 | |
75 | #define SG_ALLOW_DIO_CODE /* compile out by commenting this define */ | |
76 | ||
77 | #define SG_MAX_DEVS 32768 | |
78 | ||
79 | /* | |
80 | * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) | |
81 | * Then when using 32 bit integers x * m may overflow during the calculation. | |
82 | * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m | |
83 | * calculates the same, but prevents the overflow when both m and d | |
84 | * are "small" numbers (like HZ and USER_HZ). | |
85 | * Of course an overflow is inavoidable if the result of muldiv doesn't fit | |
86 | * in 32 bits. | |
87 | */ | |
88 | #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) | |
89 | ||
90 | #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) | |
91 | ||
92 | int sg_big_buff = SG_DEF_RESERVED_SIZE; | |
93 | /* N.B. This variable is readable and writeable via | |
94 | /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer | |
95 | of this size (or less if there is not enough memory) will be reserved | |
96 | for use by this file descriptor. [Deprecated usage: this variable is also | |
97 | readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into | |
98 | the kernel (i.e. it is not a module).] */ | |
99 | static int def_reserved_size = -1; /* picks up init parameter */ | |
100 | static int sg_allow_dio = SG_ALLOW_DIO_DEF; | |
101 | ||
102 | #define SG_SECTOR_SZ 512 | |
103 | #define SG_SECTOR_MSK (SG_SECTOR_SZ - 1) | |
104 | ||
105 | #define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */ | |
106 | ||
d8539d81 DT |
107 | static int sg_add(struct class_device *, struct class_interface *); |
108 | static void sg_remove(struct class_device *, struct class_interface *); | |
1da177e4 LT |
109 | |
110 | static Scsi_Request *dummy_cmdp; /* only used for sizeof */ | |
111 | ||
112 | static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock | |
113 | file descriptor list for device */ | |
114 | ||
115 | static struct class_interface sg_interface = { | |
116 | .add = sg_add, | |
117 | .remove = sg_remove, | |
118 | }; | |
119 | ||
120 | typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ | |
121 | unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ | |
122 | unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */ | |
123 | unsigned bufflen; /* Size of (aggregate) data buffer */ | |
124 | unsigned b_malloc_len; /* actual len malloc'ed in buffer */ | |
125 | void *buffer; /* Data buffer or scatter list (k_use_sg>0) */ | |
126 | char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ | |
127 | unsigned char cmd_opcode; /* first byte of command */ | |
128 | } Sg_scatter_hold; | |
129 | ||
130 | struct sg_device; /* forward declarations */ | |
131 | struct sg_fd; | |
132 | ||
133 | typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ | |
134 | Scsi_Request *my_cmdp; /* != 0 when request with lower levels */ | |
135 | struct sg_request *nextrp; /* NULL -> tail request (slist) */ | |
136 | struct sg_fd *parentfp; /* NULL -> not in use */ | |
137 | Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ | |
138 | sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ | |
139 | unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)]; | |
140 | char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ | |
141 | char orphan; /* 1 -> drop on sight, 0 -> normal */ | |
142 | char sg_io_owned; /* 1 -> packet belongs to SG_IO */ | |
143 | volatile char done; /* 0->before bh, 1->before read, 2->read */ | |
144 | } Sg_request; | |
145 | ||
146 | typedef struct sg_fd { /* holds the state of a file descriptor */ | |
147 | struct sg_fd *nextfp; /* NULL when last opened fd on this device */ | |
148 | struct sg_device *parentdp; /* owning device */ | |
149 | wait_queue_head_t read_wait; /* queue read until command done */ | |
150 | rwlock_t rq_list_lock; /* protect access to list in req_arr */ | |
151 | int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ | |
152 | int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ | |
153 | Sg_scatter_hold reserve; /* buffer held for this file descriptor */ | |
154 | unsigned save_scat_len; /* original length of trunc. scat. element */ | |
155 | Sg_request *headrp; /* head of request slist, NULL->empty */ | |
156 | struct fasync_struct *async_qp; /* used by asynchronous notification */ | |
157 | Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ | |
158 | char low_dma; /* as in parent but possibly overridden to 1 */ | |
159 | char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ | |
160 | volatile char closed; /* 1 -> fd closed but request(s) outstanding */ | |
161 | char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ | |
162 | char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ | |
163 | char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ | |
164 | char mmap_called; /* 0 -> mmap() never called on this fd */ | |
165 | } Sg_fd; | |
166 | ||
167 | typedef struct sg_device { /* holds the state of each scsi generic device */ | |
168 | struct scsi_device *device; | |
169 | wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ | |
170 | int sg_tablesize; /* adapter's max scatter-gather table size */ | |
171 | Sg_fd *headfp; /* first open fd belonging to this device */ | |
172 | volatile char detached; /* 0->attached, 1->detached pending removal */ | |
173 | volatile char exclude; /* opened for exclusive access */ | |
174 | char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ | |
175 | struct gendisk *disk; | |
176 | struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ | |
177 | } Sg_device; | |
178 | ||
179 | static int sg_fasync(int fd, struct file *filp, int mode); | |
180 | static void sg_cmd_done(Scsi_Cmnd * SCpnt); /* tasklet or soft irq callback */ | |
181 | static int sg_start_req(Sg_request * srp); | |
182 | static void sg_finish_rem_req(Sg_request * srp); | |
183 | static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); | |
184 | static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, | |
185 | int tablesize); | |
186 | static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, | |
187 | Sg_request * srp); | |
188 | static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, | |
189 | int blocking, int read_only, Sg_request ** o_srp); | |
190 | static int sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
191 | unsigned char *cmnd, int timeout, int blocking); | |
192 | static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
193 | int wr_xf, int *countp, unsigned char __user **up); | |
194 | static int sg_write_xfer(Sg_request * srp); | |
195 | static int sg_read_xfer(Sg_request * srp); | |
196 | static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); | |
197 | static void sg_remove_scat(Sg_scatter_hold * schp); | |
198 | static void sg_build_reserve(Sg_fd * sfp, int req_size); | |
199 | static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); | |
200 | static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); | |
201 | static char *sg_page_malloc(int rqSz, int lowDma, int *retSzp); | |
202 | static void sg_page_free(char *buff, int size); | |
203 | static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); | |
204 | static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
205 | static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp); | |
206 | static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); | |
207 | static Sg_request *sg_add_request(Sg_fd * sfp); | |
208 | static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); | |
209 | static int sg_res_in_use(Sg_fd * sfp); | |
210 | static int sg_allow_access(unsigned char opcode, char dev_type); | |
211 | static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len); | |
212 | static Sg_device *sg_get_dev(int dev); | |
213 | static inline unsigned char *sg_scatg2virt(const struct scatterlist *sclp); | |
214 | #ifdef CONFIG_SCSI_PROC_FS | |
215 | static int sg_last_dev(void); | |
216 | #endif | |
217 | ||
218 | static Sg_device **sg_dev_arr = NULL; | |
219 | static int sg_dev_max; | |
220 | static int sg_nr_dev; | |
221 | ||
222 | #define SZ_SG_HEADER sizeof(struct sg_header) | |
223 | #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) | |
224 | #define SZ_SG_IOVEC sizeof(sg_iovec_t) | |
225 | #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) | |
226 | ||
227 | static int | |
228 | sg_open(struct inode *inode, struct file *filp) | |
229 | { | |
230 | int dev = iminor(inode); | |
231 | int flags = filp->f_flags; | |
232 | Sg_device *sdp; | |
233 | Sg_fd *sfp; | |
234 | int res; | |
235 | int retval; | |
236 | ||
237 | nonseekable_open(inode, filp); | |
238 | SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); | |
239 | sdp = sg_get_dev(dev); | |
240 | if ((!sdp) || (!sdp->device)) | |
241 | return -ENXIO; | |
242 | if (sdp->detached) | |
243 | return -ENODEV; | |
244 | ||
245 | /* This driver's module count bumped by fops_get in <linux/fs.h> */ | |
246 | /* Prevent the device driver from vanishing while we sleep */ | |
247 | retval = scsi_device_get(sdp->device); | |
248 | if (retval) | |
249 | return retval; | |
250 | ||
251 | if (!((flags & O_NONBLOCK) || | |
252 | scsi_block_when_processing_errors(sdp->device))) { | |
253 | retval = -ENXIO; | |
254 | /* we are in error recovery for this device */ | |
255 | goto error_out; | |
256 | } | |
257 | ||
258 | if (flags & O_EXCL) { | |
259 | if (O_RDONLY == (flags & O_ACCMODE)) { | |
260 | retval = -EPERM; /* Can't lock it with read only access */ | |
261 | goto error_out; | |
262 | } | |
263 | if (sdp->headfp && (flags & O_NONBLOCK)) { | |
264 | retval = -EBUSY; | |
265 | goto error_out; | |
266 | } | |
267 | res = 0; | |
268 | __wait_event_interruptible(sdp->o_excl_wait, | |
269 | ((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); | |
270 | if (res) { | |
271 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
272 | goto error_out; | |
273 | } | |
274 | } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ | |
275 | if (flags & O_NONBLOCK) { | |
276 | retval = -EBUSY; | |
277 | goto error_out; | |
278 | } | |
279 | res = 0; | |
280 | __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), | |
281 | res); | |
282 | if (res) { | |
283 | retval = res; /* -ERESTARTSYS because signal hit process */ | |
284 | goto error_out; | |
285 | } | |
286 | } | |
287 | if (sdp->detached) { | |
288 | retval = -ENODEV; | |
289 | goto error_out; | |
290 | } | |
291 | if (!sdp->headfp) { /* no existing opens on this device */ | |
292 | sdp->sgdebug = 0; | |
293 | sdp->sg_tablesize = sdp->device->host->sg_tablesize; | |
294 | } | |
295 | if ((sfp = sg_add_sfp(sdp, dev))) | |
296 | filp->private_data = sfp; | |
297 | else { | |
298 | if (flags & O_EXCL) | |
299 | sdp->exclude = 0; /* undo if error */ | |
300 | retval = -ENOMEM; | |
301 | goto error_out; | |
302 | } | |
303 | return 0; | |
304 | ||
305 | error_out: | |
306 | scsi_device_put(sdp->device); | |
307 | return retval; | |
308 | } | |
309 | ||
310 | /* Following function was formerly called 'sg_close' */ | |
311 | static int | |
312 | sg_release(struct inode *inode, struct file *filp) | |
313 | { | |
314 | Sg_device *sdp; | |
315 | Sg_fd *sfp; | |
316 | ||
317 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
318 | return -ENXIO; | |
319 | SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); | |
320 | sg_fasync(-1, filp, 0); /* remove filp from async notification list */ | |
321 | if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */ | |
322 | if (!sdp->detached) { | |
323 | scsi_device_put(sdp->device); | |
324 | } | |
325 | sdp->exclude = 0; | |
326 | wake_up_interruptible(&sdp->o_excl_wait); | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
331 | static ssize_t | |
332 | sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) | |
333 | { | |
1da177e4 LT |
334 | Sg_device *sdp; |
335 | Sg_fd *sfp; | |
336 | Sg_request *srp; | |
337 | int req_pack_id = -1; | |
1da177e4 | 338 | sg_io_hdr_t *hp; |
cb59e840 DG |
339 | struct sg_header *old_hdr = NULL; |
340 | int retval = 0; | |
1da177e4 LT |
341 | |
342 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
343 | return -ENXIO; | |
344 | SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", | |
345 | sdp->disk->disk_name, (int) count)); | |
346 | if (!access_ok(VERIFY_WRITE, buf, count)) | |
347 | return -EFAULT; | |
348 | if (sfp->force_packid && (count >= SZ_SG_HEADER)) { | |
cb59e840 DG |
349 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); |
350 | if (!old_hdr) | |
351 | return -ENOMEM; | |
352 | if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { | |
353 | retval = -EFAULT; | |
354 | goto free_old_hdr; | |
355 | } | |
356 | if (old_hdr->reply_len < 0) { | |
1da177e4 | 357 | if (count >= SZ_SG_IO_HDR) { |
cb59e840 DG |
358 | sg_io_hdr_t *new_hdr; |
359 | new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); | |
360 | if (!new_hdr) { | |
361 | retval = -ENOMEM; | |
362 | goto free_old_hdr; | |
363 | } | |
364 | retval =__copy_from_user | |
365 | (new_hdr, buf, SZ_SG_IO_HDR); | |
366 | req_pack_id = new_hdr->pack_id; | |
367 | kfree(new_hdr); | |
368 | if (retval) { | |
369 | retval = -EFAULT; | |
370 | goto free_old_hdr; | |
371 | } | |
1da177e4 LT |
372 | } |
373 | } else | |
cb59e840 | 374 | req_pack_id = old_hdr->pack_id; |
1da177e4 LT |
375 | } |
376 | srp = sg_get_rq_mark(sfp, req_pack_id); | |
377 | if (!srp) { /* now wait on packet to arrive */ | |
cb59e840 DG |
378 | if (sdp->detached) { |
379 | retval = -ENODEV; | |
380 | goto free_old_hdr; | |
381 | } | |
382 | if (filp->f_flags & O_NONBLOCK) { | |
383 | retval = -EAGAIN; | |
384 | goto free_old_hdr; | |
385 | } | |
1da177e4 | 386 | while (1) { |
cb59e840 | 387 | retval = 0; /* following macro beats race condition */ |
1da177e4 | 388 | __wait_event_interruptible(sfp->read_wait, |
cb59e840 DG |
389 | (sdp->detached || |
390 | (srp = sg_get_rq_mark(sfp, req_pack_id))), | |
391 | retval); | |
392 | if (sdp->detached) { | |
393 | retval = -ENODEV; | |
394 | goto free_old_hdr; | |
395 | } | |
396 | if (0 == retval) | |
1da177e4 | 397 | break; |
cb59e840 DG |
398 | |
399 | /* -ERESTARTSYS as signal hit process */ | |
400 | goto free_old_hdr; | |
1da177e4 LT |
401 | } |
402 | } | |
cb59e840 DG |
403 | if (srp->header.interface_id != '\0') { |
404 | retval = sg_new_read(sfp, buf, count, srp); | |
405 | goto free_old_hdr; | |
406 | } | |
1da177e4 LT |
407 | |
408 | hp = &srp->header; | |
cb59e840 DG |
409 | if (old_hdr == NULL) { |
410 | old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); | |
411 | if (! old_hdr) { | |
412 | retval = -ENOMEM; | |
413 | goto free_old_hdr; | |
414 | } | |
415 | } | |
416 | memset(old_hdr, 0, SZ_SG_HEADER); | |
417 | old_hdr->reply_len = (int) hp->timeout; | |
418 | old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ | |
419 | old_hdr->pack_id = hp->pack_id; | |
420 | old_hdr->twelve_byte = | |
1da177e4 | 421 | ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; |
cb59e840 DG |
422 | old_hdr->target_status = hp->masked_status; |
423 | old_hdr->host_status = hp->host_status; | |
424 | old_hdr->driver_status = hp->driver_status; | |
1da177e4 LT |
425 | if ((CHECK_CONDITION & hp->masked_status) || |
426 | (DRIVER_SENSE & hp->driver_status)) | |
cb59e840 DG |
427 | memcpy(old_hdr->sense_buffer, srp->sense_b, |
428 | sizeof (old_hdr->sense_buffer)); | |
1da177e4 LT |
429 | switch (hp->host_status) { |
430 | /* This setup of 'result' is for backward compatibility and is best | |
431 | ignored by the user who should use target, host + driver status */ | |
432 | case DID_OK: | |
433 | case DID_PASSTHROUGH: | |
434 | case DID_SOFT_ERROR: | |
cb59e840 | 435 | old_hdr->result = 0; |
1da177e4 LT |
436 | break; |
437 | case DID_NO_CONNECT: | |
438 | case DID_BUS_BUSY: | |
439 | case DID_TIME_OUT: | |
cb59e840 | 440 | old_hdr->result = EBUSY; |
1da177e4 LT |
441 | break; |
442 | case DID_BAD_TARGET: | |
443 | case DID_ABORT: | |
444 | case DID_PARITY: | |
445 | case DID_RESET: | |
446 | case DID_BAD_INTR: | |
cb59e840 | 447 | old_hdr->result = EIO; |
1da177e4 LT |
448 | break; |
449 | case DID_ERROR: | |
cb59e840 | 450 | old_hdr->result = (srp->sense_b[0] == 0 && |
1da177e4 LT |
451 | hp->masked_status == GOOD) ? 0 : EIO; |
452 | break; | |
453 | default: | |
cb59e840 | 454 | old_hdr->result = EIO; |
1da177e4 LT |
455 | break; |
456 | } | |
457 | ||
458 | /* Now copy the result back to the user buffer. */ | |
459 | if (count >= SZ_SG_HEADER) { | |
cb59e840 DG |
460 | if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { |
461 | retval = -EFAULT; | |
462 | goto free_old_hdr; | |
463 | } | |
1da177e4 | 464 | buf += SZ_SG_HEADER; |
cb59e840 DG |
465 | if (count > old_hdr->reply_len) |
466 | count = old_hdr->reply_len; | |
1da177e4 | 467 | if (count > SZ_SG_HEADER) { |
cb59e840 DG |
468 | if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { |
469 | retval = -EFAULT; | |
470 | goto free_old_hdr; | |
471 | } | |
1da177e4 LT |
472 | } |
473 | } else | |
cb59e840 | 474 | count = (old_hdr->result == 0) ? 0 : -EIO; |
1da177e4 | 475 | sg_finish_rem_req(srp); |
cb59e840 DG |
476 | retval = count; |
477 | free_old_hdr: | |
478 | if (old_hdr) | |
479 | kfree(old_hdr); | |
480 | return retval; | |
1da177e4 LT |
481 | } |
482 | ||
483 | static ssize_t | |
484 | sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) | |
485 | { | |
486 | sg_io_hdr_t *hp = &srp->header; | |
487 | int err = 0; | |
488 | int len; | |
489 | ||
490 | if (count < SZ_SG_IO_HDR) { | |
491 | err = -EINVAL; | |
492 | goto err_out; | |
493 | } | |
494 | hp->sb_len_wr = 0; | |
495 | if ((hp->mx_sb_len > 0) && hp->sbp) { | |
496 | if ((CHECK_CONDITION & hp->masked_status) || | |
497 | (DRIVER_SENSE & hp->driver_status)) { | |
498 | int sb_len = sizeof (dummy_cmdp->sr_sense_buffer); | |
499 | sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; | |
500 | len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ | |
501 | len = (len > sb_len) ? sb_len : len; | |
502 | if (copy_to_user(hp->sbp, srp->sense_b, len)) { | |
503 | err = -EFAULT; | |
504 | goto err_out; | |
505 | } | |
506 | hp->sb_len_wr = len; | |
507 | } | |
508 | } | |
509 | if (hp->masked_status || hp->host_status || hp->driver_status) | |
510 | hp->info |= SG_INFO_CHECK; | |
511 | if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { | |
512 | err = -EFAULT; | |
513 | goto err_out; | |
514 | } | |
515 | err = sg_read_xfer(srp); | |
516 | err_out: | |
517 | sg_finish_rem_req(srp); | |
518 | return (0 == err) ? count : err; | |
519 | } | |
520 | ||
521 | static ssize_t | |
522 | sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) | |
523 | { | |
524 | int mxsize, cmd_size, k; | |
525 | int input_size, blocking; | |
526 | unsigned char opcode; | |
527 | Sg_device *sdp; | |
528 | Sg_fd *sfp; | |
529 | Sg_request *srp; | |
530 | struct sg_header old_hdr; | |
531 | sg_io_hdr_t *hp; | |
532 | unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; | |
533 | ||
534 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
535 | return -ENXIO; | |
536 | SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", | |
537 | sdp->disk->disk_name, (int) count)); | |
538 | if (sdp->detached) | |
539 | return -ENODEV; | |
540 | if (!((filp->f_flags & O_NONBLOCK) || | |
541 | scsi_block_when_processing_errors(sdp->device))) | |
542 | return -ENXIO; | |
543 | ||
544 | if (!access_ok(VERIFY_READ, buf, count)) | |
545 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
546 | if (count < SZ_SG_HEADER) | |
547 | return -EIO; | |
548 | if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) | |
549 | return -EFAULT; | |
550 | blocking = !(filp->f_flags & O_NONBLOCK); | |
551 | if (old_hdr.reply_len < 0) | |
552 | return sg_new_write(sfp, buf, count, blocking, 0, NULL); | |
553 | if (count < (SZ_SG_HEADER + 6)) | |
554 | return -EIO; /* The minimum scsi command length is 6 bytes. */ | |
555 | ||
556 | if (!(srp = sg_add_request(sfp))) { | |
557 | SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); | |
558 | return -EDOM; | |
559 | } | |
560 | buf += SZ_SG_HEADER; | |
561 | __get_user(opcode, buf); | |
562 | if (sfp->next_cmd_len > 0) { | |
563 | if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { | |
564 | SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); | |
565 | sfp->next_cmd_len = 0; | |
566 | sg_remove_request(sfp, srp); | |
567 | return -EIO; | |
568 | } | |
569 | cmd_size = sfp->next_cmd_len; | |
570 | sfp->next_cmd_len = 0; /* reset so only this write() effected */ | |
571 | } else { | |
572 | cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ | |
573 | if ((opcode >= 0xc0) && old_hdr.twelve_byte) | |
574 | cmd_size = 12; | |
575 | } | |
576 | SCSI_LOG_TIMEOUT(4, printk( | |
577 | "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); | |
578 | /* Determine buffer size. */ | |
579 | input_size = count - cmd_size; | |
580 | mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; | |
581 | mxsize -= SZ_SG_HEADER; | |
582 | input_size -= SZ_SG_HEADER; | |
583 | if (input_size < 0) { | |
584 | sg_remove_request(sfp, srp); | |
585 | return -EIO; /* User did not pass enough bytes for this command. */ | |
586 | } | |
587 | hp = &srp->header; | |
588 | hp->interface_id = '\0'; /* indicator of old interface tunnelled */ | |
589 | hp->cmd_len = (unsigned char) cmd_size; | |
590 | hp->iovec_count = 0; | |
591 | hp->mx_sb_len = 0; | |
592 | if (input_size > 0) | |
593 | hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? | |
594 | SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; | |
595 | else | |
596 | hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; | |
597 | hp->dxfer_len = mxsize; | |
598 | hp->dxferp = (char __user *)buf + cmd_size; | |
599 | hp->sbp = NULL; | |
600 | hp->timeout = old_hdr.reply_len; /* structure abuse ... */ | |
601 | hp->flags = input_size; /* structure abuse ... */ | |
602 | hp->pack_id = old_hdr.pack_id; | |
603 | hp->usr_ptr = NULL; | |
604 | if (__copy_from_user(cmnd, buf, cmd_size)) | |
605 | return -EFAULT; | |
606 | /* | |
607 | * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, | |
608 | * but is is possible that the app intended SG_DXFER_TO_DEV, because there | |
609 | * is a non-zero input_size, so emit a warning. | |
610 | */ | |
611 | if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) | |
612 | if (printk_ratelimit()) | |
613 | printk(KERN_WARNING | |
614 | "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" | |
615 | "guessing data in;\n" KERN_WARNING " " | |
616 | "program %s not setting count and/or reply_len properly\n", | |
617 | old_hdr.reply_len - (int)SZ_SG_HEADER, | |
618 | input_size, (unsigned int) cmnd[0], | |
619 | current->comm); | |
620 | k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); | |
621 | return (k < 0) ? k : count; | |
622 | } | |
623 | ||
624 | static ssize_t | |
625 | sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count, | |
626 | int blocking, int read_only, Sg_request ** o_srp) | |
627 | { | |
628 | int k; | |
629 | Sg_request *srp; | |
630 | sg_io_hdr_t *hp; | |
631 | unsigned char cmnd[sizeof (dummy_cmdp->sr_cmnd)]; | |
632 | int timeout; | |
633 | unsigned long ul_timeout; | |
634 | ||
635 | if (count < SZ_SG_IO_HDR) | |
636 | return -EINVAL; | |
637 | if (!access_ok(VERIFY_READ, buf, count)) | |
638 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
639 | ||
640 | sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ | |
641 | if (!(srp = sg_add_request(sfp))) { | |
642 | SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); | |
643 | return -EDOM; | |
644 | } | |
645 | hp = &srp->header; | |
646 | if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { | |
647 | sg_remove_request(sfp, srp); | |
648 | return -EFAULT; | |
649 | } | |
650 | if (hp->interface_id != 'S') { | |
651 | sg_remove_request(sfp, srp); | |
652 | return -ENOSYS; | |
653 | } | |
654 | if (hp->flags & SG_FLAG_MMAP_IO) { | |
655 | if (hp->dxfer_len > sfp->reserve.bufflen) { | |
656 | sg_remove_request(sfp, srp); | |
657 | return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ | |
658 | } | |
659 | if (hp->flags & SG_FLAG_DIRECT_IO) { | |
660 | sg_remove_request(sfp, srp); | |
661 | return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ | |
662 | } | |
663 | if (sg_res_in_use(sfp)) { | |
664 | sg_remove_request(sfp, srp); | |
665 | return -EBUSY; /* reserve buffer already being used */ | |
666 | } | |
667 | } | |
668 | ul_timeout = msecs_to_jiffies(srp->header.timeout); | |
669 | timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; | |
670 | if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { | |
671 | sg_remove_request(sfp, srp); | |
672 | return -EMSGSIZE; | |
673 | } | |
674 | if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { | |
675 | sg_remove_request(sfp, srp); | |
676 | return -EFAULT; /* protects following copy_from_user()s + get_user()s */ | |
677 | } | |
678 | if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { | |
679 | sg_remove_request(sfp, srp); | |
680 | return -EFAULT; | |
681 | } | |
682 | if (read_only && | |
683 | (!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) { | |
684 | sg_remove_request(sfp, srp); | |
685 | return -EPERM; | |
686 | } | |
687 | k = sg_common_write(sfp, srp, cmnd, timeout, blocking); | |
688 | if (k < 0) | |
689 | return k; | |
690 | if (o_srp) | |
691 | *o_srp = srp; | |
692 | return count; | |
693 | } | |
694 | ||
695 | static int | |
696 | sg_common_write(Sg_fd * sfp, Sg_request * srp, | |
697 | unsigned char *cmnd, int timeout, int blocking) | |
698 | { | |
699 | int k; | |
700 | Scsi_Request *SRpnt; | |
701 | Sg_device *sdp = sfp->parentdp; | |
702 | sg_io_hdr_t *hp = &srp->header; | |
703 | request_queue_t *q; | |
704 | ||
705 | srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ | |
706 | hp->status = 0; | |
707 | hp->masked_status = 0; | |
708 | hp->msg_status = 0; | |
709 | hp->info = 0; | |
710 | hp->host_status = 0; | |
711 | hp->driver_status = 0; | |
712 | hp->resid = 0; | |
713 | SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", | |
714 | (int) cmnd[0], (int) hp->cmd_len)); | |
715 | ||
716 | if ((k = sg_start_req(srp))) { | |
717 | SCSI_LOG_TIMEOUT(1, printk("sg_write: start_req err=%d\n", k)); | |
718 | sg_finish_rem_req(srp); | |
719 | return k; /* probably out of space --> ENOMEM */ | |
720 | } | |
721 | if ((k = sg_write_xfer(srp))) { | |
722 | SCSI_LOG_TIMEOUT(1, printk("sg_write: write_xfer, bad address\n")); | |
723 | sg_finish_rem_req(srp); | |
724 | return k; | |
725 | } | |
726 | if (sdp->detached) { | |
727 | sg_finish_rem_req(srp); | |
728 | return -ENODEV; | |
729 | } | |
730 | SRpnt = scsi_allocate_request(sdp->device, GFP_ATOMIC); | |
731 | if (SRpnt == NULL) { | |
732 | SCSI_LOG_TIMEOUT(1, printk("sg_write: no mem\n")); | |
733 | sg_finish_rem_req(srp); | |
734 | return -ENOMEM; | |
735 | } | |
736 | ||
737 | srp->my_cmdp = SRpnt; | |
738 | q = SRpnt->sr_device->request_queue; | |
739 | SRpnt->sr_request->rq_disk = sdp->disk; | |
740 | SRpnt->sr_sense_buffer[0] = 0; | |
741 | SRpnt->sr_cmd_len = hp->cmd_len; | |
742 | SRpnt->sr_use_sg = srp->data.k_use_sg; | |
743 | SRpnt->sr_sglist_len = srp->data.sglist_len; | |
744 | SRpnt->sr_bufflen = srp->data.bufflen; | |
745 | SRpnt->sr_underflow = 0; | |
746 | SRpnt->sr_buffer = srp->data.buffer; | |
747 | switch (hp->dxfer_direction) { | |
748 | case SG_DXFER_TO_FROM_DEV: | |
749 | case SG_DXFER_FROM_DEV: | |
be7db055 | 750 | SRpnt->sr_data_direction = DMA_FROM_DEVICE; |
1da177e4 LT |
751 | break; |
752 | case SG_DXFER_TO_DEV: | |
be7db055 | 753 | SRpnt->sr_data_direction = DMA_TO_DEVICE; |
1da177e4 LT |
754 | break; |
755 | case SG_DXFER_UNKNOWN: | |
be7db055 | 756 | SRpnt->sr_data_direction = DMA_BIDIRECTIONAL; |
1da177e4 LT |
757 | break; |
758 | default: | |
be7db055 | 759 | SRpnt->sr_data_direction = DMA_NONE; |
1da177e4 LT |
760 | break; |
761 | } | |
762 | SRpnt->upper_private_data = srp; | |
763 | srp->data.k_use_sg = 0; | |
764 | srp->data.sglist_len = 0; | |
765 | srp->data.bufflen = 0; | |
766 | srp->data.buffer = NULL; | |
cb59e840 | 767 | hp->duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
768 | /* Now send everything of to mid-level. The next time we hear about this |
769 | packet is when sg_cmd_done() is called (i.e. a callback). */ | |
770 | scsi_do_req(SRpnt, (void *) cmnd, | |
771 | (void *) SRpnt->sr_buffer, hp->dxfer_len, | |
772 | sg_cmd_done, timeout, SG_DEFAULT_RETRIES); | |
773 | /* dxfer_len overwrites SRpnt->sr_bufflen, hence need for b_malloc_len */ | |
774 | return 0; | |
775 | } | |
776 | ||
777 | static int | |
778 | sg_srp_done(Sg_request *srp, Sg_fd *sfp) | |
779 | { | |
780 | unsigned long iflags; | |
781 | int done; | |
782 | ||
783 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
784 | done = srp->done; | |
785 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
786 | return done; | |
787 | } | |
788 | ||
789 | static int | |
790 | sg_ioctl(struct inode *inode, struct file *filp, | |
791 | unsigned int cmd_in, unsigned long arg) | |
792 | { | |
793 | void __user *p = (void __user *)arg; | |
794 | int __user *ip = p; | |
795 | int result, val, read_only; | |
796 | Sg_device *sdp; | |
797 | Sg_fd *sfp; | |
798 | Sg_request *srp; | |
799 | unsigned long iflags; | |
800 | ||
801 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
802 | return -ENXIO; | |
803 | SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", | |
804 | sdp->disk->disk_name, (int) cmd_in)); | |
805 | read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); | |
806 | ||
807 | switch (cmd_in) { | |
808 | case SG_IO: | |
809 | { | |
810 | int blocking = 1; /* ignore O_NONBLOCK flag */ | |
811 | ||
812 | if (sdp->detached) | |
813 | return -ENODEV; | |
814 | if (!scsi_block_when_processing_errors(sdp->device)) | |
815 | return -ENXIO; | |
816 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) | |
817 | return -EFAULT; | |
818 | result = | |
819 | sg_new_write(sfp, p, SZ_SG_IO_HDR, | |
820 | blocking, read_only, &srp); | |
821 | if (result < 0) | |
822 | return result; | |
823 | srp->sg_io_owned = 1; | |
824 | while (1) { | |
825 | result = 0; /* following macro to beat race condition */ | |
826 | __wait_event_interruptible(sfp->read_wait, | |
827 | (sdp->detached || sfp->closed || sg_srp_done(srp, sfp)), | |
828 | result); | |
829 | if (sdp->detached) | |
830 | return -ENODEV; | |
831 | if (sfp->closed) | |
832 | return 0; /* request packet dropped already */ | |
833 | if (0 == result) | |
834 | break; | |
835 | srp->orphan = 1; | |
836 | return result; /* -ERESTARTSYS because signal hit process */ | |
837 | } | |
838 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
839 | srp->done = 2; | |
840 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
841 | result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); | |
842 | return (result < 0) ? result : 0; | |
843 | } | |
844 | case SG_SET_TIMEOUT: | |
845 | result = get_user(val, ip); | |
846 | if (result) | |
847 | return result; | |
848 | if (val < 0) | |
849 | return -EIO; | |
850 | if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) | |
851 | val = MULDIV (INT_MAX, USER_HZ, HZ); | |
852 | sfp->timeout_user = val; | |
853 | sfp->timeout = MULDIV (val, HZ, USER_HZ); | |
854 | ||
855 | return 0; | |
856 | case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ | |
857 | /* strange ..., for backward compatibility */ | |
858 | return sfp->timeout_user; | |
859 | case SG_SET_FORCE_LOW_DMA: | |
860 | result = get_user(val, ip); | |
861 | if (result) | |
862 | return result; | |
863 | if (val) { | |
864 | sfp->low_dma = 1; | |
865 | if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { | |
866 | val = (int) sfp->reserve.bufflen; | |
867 | sg_remove_scat(&sfp->reserve); | |
868 | sg_build_reserve(sfp, val); | |
869 | } | |
870 | } else { | |
871 | if (sdp->detached) | |
872 | return -ENODEV; | |
873 | sfp->low_dma = sdp->device->host->unchecked_isa_dma; | |
874 | } | |
875 | return 0; | |
876 | case SG_GET_LOW_DMA: | |
877 | return put_user((int) sfp->low_dma, ip); | |
878 | case SG_GET_SCSI_ID: | |
879 | if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) | |
880 | return -EFAULT; | |
881 | else { | |
882 | sg_scsi_id_t __user *sg_idp = p; | |
883 | ||
884 | if (sdp->detached) | |
885 | return -ENODEV; | |
886 | __put_user((int) sdp->device->host->host_no, | |
887 | &sg_idp->host_no); | |
888 | __put_user((int) sdp->device->channel, | |
889 | &sg_idp->channel); | |
890 | __put_user((int) sdp->device->id, &sg_idp->scsi_id); | |
891 | __put_user((int) sdp->device->lun, &sg_idp->lun); | |
892 | __put_user((int) sdp->device->type, &sg_idp->scsi_type); | |
893 | __put_user((short) sdp->device->host->cmd_per_lun, | |
894 | &sg_idp->h_cmd_per_lun); | |
895 | __put_user((short) sdp->device->queue_depth, | |
896 | &sg_idp->d_queue_depth); | |
897 | __put_user(0, &sg_idp->unused[0]); | |
898 | __put_user(0, &sg_idp->unused[1]); | |
899 | return 0; | |
900 | } | |
901 | case SG_SET_FORCE_PACK_ID: | |
902 | result = get_user(val, ip); | |
903 | if (result) | |
904 | return result; | |
905 | sfp->force_packid = val ? 1 : 0; | |
906 | return 0; | |
907 | case SG_GET_PACK_ID: | |
908 | if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) | |
909 | return -EFAULT; | |
910 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
911 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
912 | if ((1 == srp->done) && (!srp->sg_io_owned)) { | |
913 | read_unlock_irqrestore(&sfp->rq_list_lock, | |
914 | iflags); | |
915 | __put_user(srp->header.pack_id, ip); | |
916 | return 0; | |
917 | } | |
918 | } | |
919 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
920 | __put_user(-1, ip); | |
921 | return 0; | |
922 | case SG_GET_NUM_WAITING: | |
923 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
924 | for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { | |
925 | if ((1 == srp->done) && (!srp->sg_io_owned)) | |
926 | ++val; | |
927 | } | |
928 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
929 | return put_user(val, ip); | |
930 | case SG_GET_SG_TABLESIZE: | |
931 | return put_user(sdp->sg_tablesize, ip); | |
932 | case SG_SET_RESERVED_SIZE: | |
933 | result = get_user(val, ip); | |
934 | if (result) | |
935 | return result; | |
936 | if (val < 0) | |
937 | return -EINVAL; | |
938 | if (val != sfp->reserve.bufflen) { | |
939 | if (sg_res_in_use(sfp) || sfp->mmap_called) | |
940 | return -EBUSY; | |
941 | sg_remove_scat(&sfp->reserve); | |
942 | sg_build_reserve(sfp, val); | |
943 | } | |
944 | return 0; | |
945 | case SG_GET_RESERVED_SIZE: | |
946 | val = (int) sfp->reserve.bufflen; | |
947 | return put_user(val, ip); | |
948 | case SG_SET_COMMAND_Q: | |
949 | result = get_user(val, ip); | |
950 | if (result) | |
951 | return result; | |
952 | sfp->cmd_q = val ? 1 : 0; | |
953 | return 0; | |
954 | case SG_GET_COMMAND_Q: | |
955 | return put_user((int) sfp->cmd_q, ip); | |
956 | case SG_SET_KEEP_ORPHAN: | |
957 | result = get_user(val, ip); | |
958 | if (result) | |
959 | return result; | |
960 | sfp->keep_orphan = val; | |
961 | return 0; | |
962 | case SG_GET_KEEP_ORPHAN: | |
963 | return put_user((int) sfp->keep_orphan, ip); | |
964 | case SG_NEXT_CMD_LEN: | |
965 | result = get_user(val, ip); | |
966 | if (result) | |
967 | return result; | |
968 | sfp->next_cmd_len = (val > 0) ? val : 0; | |
969 | return 0; | |
970 | case SG_GET_VERSION_NUM: | |
971 | return put_user(sg_version_num, ip); | |
972 | case SG_GET_ACCESS_COUNT: | |
973 | /* faked - we don't have a real access count anymore */ | |
974 | val = (sdp->device ? 1 : 0); | |
975 | return put_user(val, ip); | |
976 | case SG_GET_REQUEST_TABLE: | |
977 | if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) | |
978 | return -EFAULT; | |
979 | else { | |
cb59e840 DG |
980 | sg_req_info_t *rinfo; |
981 | unsigned int ms; | |
982 | ||
983 | rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, | |
984 | GFP_KERNEL); | |
985 | if (!rinfo) | |
986 | return -ENOMEM; | |
1da177e4 LT |
987 | read_lock_irqsave(&sfp->rq_list_lock, iflags); |
988 | for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; | |
989 | ++val, srp = srp ? srp->nextrp : srp) { | |
990 | memset(&rinfo[val], 0, SZ_SG_REQ_INFO); | |
991 | if (srp) { | |
992 | rinfo[val].req_state = srp->done + 1; | |
993 | rinfo[val].problem = | |
994 | srp->header.masked_status & | |
995 | srp->header.host_status & | |
996 | srp->header.driver_status; | |
cb59e840 DG |
997 | if (srp->done) |
998 | rinfo[val].duration = | |
999 | srp->header.duration; | |
1000 | else { | |
1001 | ms = jiffies_to_msecs(jiffies); | |
1002 | rinfo[val].duration = | |
1003 | (ms > srp->header.duration) ? | |
1004 | (ms - srp->header.duration) : 0; | |
1005 | } | |
1da177e4 | 1006 | rinfo[val].orphan = srp->orphan; |
cb59e840 DG |
1007 | rinfo[val].sg_io_owned = |
1008 | srp->sg_io_owned; | |
1009 | rinfo[val].pack_id = | |
1010 | srp->header.pack_id; | |
1011 | rinfo[val].usr_ptr = | |
1012 | srp->header.usr_ptr; | |
1da177e4 LT |
1013 | } |
1014 | } | |
1015 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
cb59e840 DG |
1016 | result = __copy_to_user(p, rinfo, |
1017 | SZ_SG_REQ_INFO * SG_MAX_QUEUE); | |
1018 | result = result ? -EFAULT : 0; | |
1019 | kfree(rinfo); | |
1020 | return result; | |
1da177e4 LT |
1021 | } |
1022 | case SG_EMULATED_HOST: | |
1023 | if (sdp->detached) | |
1024 | return -ENODEV; | |
1025 | return put_user(sdp->device->host->hostt->emulated, ip); | |
1026 | case SG_SCSI_RESET: | |
1027 | if (sdp->detached) | |
1028 | return -ENODEV; | |
1029 | if (filp->f_flags & O_NONBLOCK) { | |
939647ee | 1030 | if (scsi_host_in_recovery(sdp->device->host)) |
1da177e4 LT |
1031 | return -EBUSY; |
1032 | } else if (!scsi_block_when_processing_errors(sdp->device)) | |
1033 | return -EBUSY; | |
1034 | result = get_user(val, ip); | |
1035 | if (result) | |
1036 | return result; | |
1037 | if (SG_SCSI_RESET_NOTHING == val) | |
1038 | return 0; | |
1039 | switch (val) { | |
1040 | case SG_SCSI_RESET_DEVICE: | |
1041 | val = SCSI_TRY_RESET_DEVICE; | |
1042 | break; | |
1043 | case SG_SCSI_RESET_BUS: | |
1044 | val = SCSI_TRY_RESET_BUS; | |
1045 | break; | |
1046 | case SG_SCSI_RESET_HOST: | |
1047 | val = SCSI_TRY_RESET_HOST; | |
1048 | break; | |
1049 | default: | |
1050 | return -EINVAL; | |
1051 | } | |
1052 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
1053 | return -EACCES; | |
1054 | return (scsi_reset_provider(sdp->device, val) == | |
1055 | SUCCESS) ? 0 : -EIO; | |
1056 | case SCSI_IOCTL_SEND_COMMAND: | |
1057 | if (sdp->detached) | |
1058 | return -ENODEV; | |
1059 | if (read_only) { | |
1060 | unsigned char opcode = WRITE_6; | |
1061 | Scsi_Ioctl_Command __user *siocp = p; | |
1062 | ||
1063 | if (copy_from_user(&opcode, siocp->data, 1)) | |
1064 | return -EFAULT; | |
1065 | if (!sg_allow_access(opcode, sdp->device->type)) | |
1066 | return -EPERM; | |
1067 | } | |
1068 | return scsi_ioctl_send_command(sdp->device, p); | |
1069 | case SG_SET_DEBUG: | |
1070 | result = get_user(val, ip); | |
1071 | if (result) | |
1072 | return result; | |
1073 | sdp->sgdebug = (char) val; | |
1074 | return 0; | |
1075 | case SCSI_IOCTL_GET_IDLUN: | |
1076 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
1077 | case SCSI_IOCTL_PROBE_HOST: | |
1078 | case SG_GET_TRANSFORM: | |
1079 | if (sdp->detached) | |
1080 | return -ENODEV; | |
1081 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1082 | default: | |
1083 | if (read_only) | |
1084 | return -EPERM; /* don't know so take safe approach */ | |
1085 | return scsi_ioctl(sdp->device, cmd_in, p); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | #ifdef CONFIG_COMPAT | |
1090 | static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) | |
1091 | { | |
1092 | Sg_device *sdp; | |
1093 | Sg_fd *sfp; | |
1094 | struct scsi_device *sdev; | |
1095 | ||
1096 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1097 | return -ENXIO; | |
1098 | ||
1099 | sdev = sdp->device; | |
1100 | if (sdev->host->hostt->compat_ioctl) { | |
1101 | int ret; | |
1102 | ||
1103 | ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); | |
1104 | ||
1105 | return ret; | |
1106 | } | |
1107 | ||
1108 | return -ENOIOCTLCMD; | |
1109 | } | |
1110 | #endif | |
1111 | ||
1112 | static unsigned int | |
1113 | sg_poll(struct file *filp, poll_table * wait) | |
1114 | { | |
1115 | unsigned int res = 0; | |
1116 | Sg_device *sdp; | |
1117 | Sg_fd *sfp; | |
1118 | Sg_request *srp; | |
1119 | int count = 0; | |
1120 | unsigned long iflags; | |
1121 | ||
1122 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) | |
1123 | || sfp->closed) | |
1124 | return POLLERR; | |
1125 | poll_wait(filp, &sfp->read_wait, wait); | |
1126 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1127 | for (srp = sfp->headrp; srp; srp = srp->nextrp) { | |
1128 | /* if any read waiting, flag it */ | |
1129 | if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) | |
1130 | res = POLLIN | POLLRDNORM; | |
1131 | ++count; | |
1132 | } | |
1133 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1134 | ||
1135 | if (sdp->detached) | |
1136 | res |= POLLHUP; | |
1137 | else if (!sfp->cmd_q) { | |
1138 | if (0 == count) | |
1139 | res |= POLLOUT | POLLWRNORM; | |
1140 | } else if (count < SG_MAX_QUEUE) | |
1141 | res |= POLLOUT | POLLWRNORM; | |
1142 | SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", | |
1143 | sdp->disk->disk_name, (int) res)); | |
1144 | return res; | |
1145 | } | |
1146 | ||
1147 | static int | |
1148 | sg_fasync(int fd, struct file *filp, int mode) | |
1149 | { | |
1150 | int retval; | |
1151 | Sg_device *sdp; | |
1152 | Sg_fd *sfp; | |
1153 | ||
1154 | if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) | |
1155 | return -ENXIO; | |
1156 | SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", | |
1157 | sdp->disk->disk_name, mode)); | |
1158 | ||
1159 | retval = fasync_helper(fd, filp, mode, &sfp->async_qp); | |
1160 | return (retval < 0) ? retval : 0; | |
1161 | } | |
1162 | ||
1163 | static inline unsigned char * | |
1164 | sg_scatg2virt(const struct scatterlist *sclp) | |
1165 | { | |
1166 | return (sclp && sclp->page) ? | |
1167 | (unsigned char *) page_address(sclp->page) + sclp->offset : NULL; | |
1168 | } | |
1169 | ||
1170 | /* When startFinish==1 increments page counts for pages other than the | |
1171 | first of scatter gather elements obtained from __get_free_pages(). | |
1172 | When startFinish==0 decrements ... */ | |
1173 | static void | |
1174 | sg_rb_correct4mmap(Sg_scatter_hold * rsv_schp, int startFinish) | |
1175 | { | |
1176 | void *page_ptr; | |
1177 | struct page *page; | |
1178 | int k, m; | |
1179 | ||
1180 | SCSI_LOG_TIMEOUT(3, printk("sg_rb_correct4mmap: startFinish=%d, scatg=%d\n", | |
1181 | startFinish, rsv_schp->k_use_sg)); | |
1182 | /* N.B. correction _not_ applied to base page of each allocation */ | |
1183 | if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ | |
1184 | struct scatterlist *sclp = rsv_schp->buffer; | |
1185 | ||
1186 | for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) { | |
1187 | for (m = PAGE_SIZE; m < sclp->length; m += PAGE_SIZE) { | |
1188 | page_ptr = sg_scatg2virt(sclp) + m; | |
1189 | page = virt_to_page(page_ptr); | |
1190 | if (startFinish) | |
1191 | get_page(page); | |
1192 | else { | |
1193 | if (page_count(page) > 0) | |
1194 | __put_page(page); | |
1195 | } | |
1196 | } | |
1197 | } | |
1198 | } else { /* reserve buffer is just a single allocation */ | |
1199 | for (m = PAGE_SIZE; m < rsv_schp->bufflen; m += PAGE_SIZE) { | |
1200 | page_ptr = (unsigned char *) rsv_schp->buffer + m; | |
1201 | page = virt_to_page(page_ptr); | |
1202 | if (startFinish) | |
1203 | get_page(page); | |
1204 | else { | |
1205 | if (page_count(page) > 0) | |
1206 | __put_page(page); | |
1207 | } | |
1208 | } | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | static struct page * | |
1213 | sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type) | |
1214 | { | |
1215 | Sg_fd *sfp; | |
1216 | struct page *page = NOPAGE_SIGBUS; | |
1217 | void *page_ptr = NULL; | |
1218 | unsigned long offset; | |
1219 | Sg_scatter_hold *rsv_schp; | |
1220 | ||
1221 | if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) | |
1222 | return page; | |
1223 | rsv_schp = &sfp->reserve; | |
1224 | offset = addr - vma->vm_start; | |
1225 | if (offset >= rsv_schp->bufflen) | |
1226 | return page; | |
1227 | SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n", | |
1228 | offset, rsv_schp->k_use_sg)); | |
1229 | if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ | |
1230 | int k; | |
1231 | unsigned long sa = vma->vm_start; | |
1232 | unsigned long len; | |
1233 | struct scatterlist *sclp = rsv_schp->buffer; | |
1234 | ||
1235 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
1236 | ++k, ++sclp) { | |
1237 | len = vma->vm_end - sa; | |
1238 | len = (len < sclp->length) ? len : sclp->length; | |
1239 | if (offset < len) { | |
1240 | page_ptr = sg_scatg2virt(sclp) + offset; | |
1241 | page = virt_to_page(page_ptr); | |
1242 | get_page(page); /* increment page count */ | |
1243 | break; | |
1244 | } | |
1245 | sa += len; | |
1246 | offset -= len; | |
1247 | } | |
1248 | } else { /* reserve buffer is just a single allocation */ | |
1249 | page_ptr = (unsigned char *) rsv_schp->buffer + offset; | |
1250 | page = virt_to_page(page_ptr); | |
1251 | get_page(page); /* increment page count */ | |
1252 | } | |
1253 | if (type) | |
1254 | *type = VM_FAULT_MINOR; | |
1255 | return page; | |
1256 | } | |
1257 | ||
1258 | static struct vm_operations_struct sg_mmap_vm_ops = { | |
1259 | .nopage = sg_vma_nopage, | |
1260 | }; | |
1261 | ||
1262 | static int | |
1263 | sg_mmap(struct file *filp, struct vm_area_struct *vma) | |
1264 | { | |
1265 | Sg_fd *sfp; | |
cb59e840 | 1266 | unsigned long req_sz; |
1da177e4 LT |
1267 | Sg_scatter_hold *rsv_schp; |
1268 | ||
1269 | if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) | |
1270 | return -ENXIO; | |
cb59e840 | 1271 | req_sz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
1272 | SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", |
1273 | (void *) vma->vm_start, (int) req_sz)); | |
1274 | if (vma->vm_pgoff) | |
1275 | return -EINVAL; /* want no offset */ | |
1276 | rsv_schp = &sfp->reserve; | |
1277 | if (req_sz > rsv_schp->bufflen) | |
1278 | return -ENOMEM; /* cannot map more than reserved buffer */ | |
1279 | ||
1280 | if (rsv_schp->k_use_sg) { /* reserve buffer is a scatter gather list */ | |
1281 | int k; | |
1282 | unsigned long sa = vma->vm_start; | |
1283 | unsigned long len; | |
1284 | struct scatterlist *sclp = rsv_schp->buffer; | |
1285 | ||
1286 | for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end); | |
1287 | ++k, ++sclp) { | |
1288 | if (0 != sclp->offset) | |
1289 | return -EFAULT; /* non page aligned memory ?? */ | |
1290 | len = vma->vm_end - sa; | |
1291 | len = (len < sclp->length) ? len : sclp->length; | |
1292 | sa += len; | |
1293 | } | |
1294 | } else { /* reserve buffer is just a single allocation */ | |
1295 | if ((unsigned long) rsv_schp->buffer & (PAGE_SIZE - 1)) | |
1296 | return -EFAULT; /* non page aligned memory ?? */ | |
1297 | } | |
1298 | if (0 == sfp->mmap_called) { | |
1299 | sg_rb_correct4mmap(rsv_schp, 1); /* do only once per fd lifetime */ | |
1300 | sfp->mmap_called = 1; | |
1301 | } | |
1c8e71d7 | 1302 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
1303 | vma->vm_private_data = sfp; |
1304 | vma->vm_ops = &sg_mmap_vm_ops; | |
1305 | return 0; | |
1306 | } | |
1307 | ||
1308 | /* This function is a "bottom half" handler that is called by the | |
1309 | * mid level when a command is completed (or has failed). */ | |
1310 | static void | |
1311 | sg_cmd_done(Scsi_Cmnd * SCpnt) | |
1312 | { | |
1313 | Scsi_Request *SRpnt = NULL; | |
1314 | Sg_device *sdp = NULL; | |
1315 | Sg_fd *sfp; | |
1316 | Sg_request *srp = NULL; | |
1317 | unsigned long iflags; | |
cb59e840 | 1318 | unsigned int ms; |
1da177e4 LT |
1319 | |
1320 | if (SCpnt && (SRpnt = SCpnt->sc_request)) | |
1321 | srp = (Sg_request *) SRpnt->upper_private_data; | |
1322 | if (NULL == srp) { | |
1323 | printk(KERN_ERR "sg_cmd_done: NULL request\n"); | |
1324 | if (SRpnt) | |
1325 | scsi_release_request(SRpnt); | |
1326 | return; | |
1327 | } | |
1328 | sfp = srp->parentfp; | |
1329 | if (sfp) | |
1330 | sdp = sfp->parentdp; | |
1331 | if ((NULL == sdp) || sdp->detached) { | |
1332 | printk(KERN_INFO "sg_cmd_done: device detached\n"); | |
1333 | scsi_release_request(SRpnt); | |
1334 | return; | |
1335 | } | |
1336 | ||
1337 | /* First transfer ownership of data buffers to sg_device object. */ | |
1338 | srp->data.k_use_sg = SRpnt->sr_use_sg; | |
1339 | srp->data.sglist_len = SRpnt->sr_sglist_len; | |
1340 | srp->data.bufflen = SRpnt->sr_bufflen; | |
1341 | srp->data.buffer = SRpnt->sr_buffer; | |
1342 | /* now clear out request structure */ | |
1343 | SRpnt->sr_use_sg = 0; | |
1344 | SRpnt->sr_sglist_len = 0; | |
1345 | SRpnt->sr_bufflen = 0; | |
1346 | SRpnt->sr_buffer = NULL; | |
1347 | SRpnt->sr_underflow = 0; | |
1348 | SRpnt->sr_request->rq_disk = NULL; /* "sg" _disowns_ request blk */ | |
1349 | ||
1350 | srp->my_cmdp = NULL; | |
1351 | ||
1352 | SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", | |
1353 | sdp->disk->disk_name, srp->header.pack_id, (int) SRpnt->sr_result)); | |
1354 | srp->header.resid = SCpnt->resid; | |
cb59e840 DG |
1355 | ms = jiffies_to_msecs(jiffies); |
1356 | srp->header.duration = (ms > srp->header.duration) ? | |
1357 | (ms - srp->header.duration) : 0; | |
1da177e4 LT |
1358 | if (0 != SRpnt->sr_result) { |
1359 | struct scsi_sense_hdr sshdr; | |
1360 | ||
1361 | memcpy(srp->sense_b, SRpnt->sr_sense_buffer, | |
1362 | sizeof (srp->sense_b)); | |
1363 | srp->header.status = 0xff & SRpnt->sr_result; | |
1364 | srp->header.masked_status = status_byte(SRpnt->sr_result); | |
1365 | srp->header.msg_status = msg_byte(SRpnt->sr_result); | |
1366 | srp->header.host_status = host_byte(SRpnt->sr_result); | |
1367 | srp->header.driver_status = driver_byte(SRpnt->sr_result); | |
1368 | if ((sdp->sgdebug > 0) && | |
1369 | ((CHECK_CONDITION == srp->header.masked_status) || | |
1370 | (COMMAND_TERMINATED == srp->header.masked_status))) | |
db9dff36 | 1371 | scsi_print_req_sense("sg_cmd_done", SRpnt); |
1da177e4 LT |
1372 | |
1373 | /* Following if statement is a patch supplied by Eric Youngdale */ | |
1374 | if (driver_byte(SRpnt->sr_result) != 0 | |
1375 | && scsi_command_normalize_sense(SCpnt, &sshdr) | |
1376 | && !scsi_sense_is_deferred(&sshdr) | |
1377 | && sshdr.sense_key == UNIT_ATTENTION | |
1378 | && sdp->device->removable) { | |
1379 | /* Detected possible disc change. Set the bit - this */ | |
1380 | /* may be used if there are filesystems using this device */ | |
1381 | sdp->device->changed = 1; | |
1382 | } | |
1383 | } | |
1384 | /* Rely on write phase to clean out srp status values, so no "else" */ | |
1385 | ||
1386 | scsi_release_request(SRpnt); | |
1387 | SRpnt = NULL; | |
1388 | if (sfp->closed) { /* whoops this fd already released, cleanup */ | |
1389 | SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n")); | |
1390 | sg_finish_rem_req(srp); | |
1391 | srp = NULL; | |
1392 | if (NULL == sfp->headrp) { | |
1393 | SCSI_LOG_TIMEOUT(1, printk("sg...bh: already closed, final cleanup\n")); | |
1394 | if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */ | |
1395 | scsi_device_put(sdp->device); | |
1396 | } | |
1397 | sfp = NULL; | |
1398 | } | |
1399 | } else if (srp && srp->orphan) { | |
1400 | if (sfp->keep_orphan) | |
1401 | srp->sg_io_owned = 0; | |
1402 | else { | |
1403 | sg_finish_rem_req(srp); | |
1404 | srp = NULL; | |
1405 | } | |
1406 | } | |
1407 | if (sfp && srp) { | |
1408 | /* Now wake up any sg_read() that is waiting for this packet. */ | |
1409 | kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); | |
1410 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
1411 | srp->done = 1; | |
1412 | wake_up_interruptible(&sfp->read_wait); | |
1413 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | static struct file_operations sg_fops = { | |
1418 | .owner = THIS_MODULE, | |
1419 | .read = sg_read, | |
1420 | .write = sg_write, | |
1421 | .poll = sg_poll, | |
1422 | .ioctl = sg_ioctl, | |
1423 | #ifdef CONFIG_COMPAT | |
1424 | .compat_ioctl = sg_compat_ioctl, | |
1425 | #endif | |
1426 | .open = sg_open, | |
1427 | .mmap = sg_mmap, | |
1428 | .release = sg_release, | |
1429 | .fasync = sg_fasync, | |
1430 | }; | |
1431 | ||
d253878b | 1432 | static struct class *sg_sysfs_class; |
1da177e4 LT |
1433 | |
1434 | static int sg_sysfs_valid = 0; | |
1435 | ||
1436 | static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) | |
1437 | { | |
1438 | Sg_device *sdp; | |
1439 | unsigned long iflags; | |
1440 | void *old_sg_dev_arr = NULL; | |
1441 | int k, error; | |
1442 | ||
1443 | sdp = kmalloc(sizeof(Sg_device), GFP_KERNEL); | |
1444 | if (!sdp) { | |
1445 | printk(KERN_WARNING "kmalloc Sg_device failure\n"); | |
1446 | return -ENOMEM; | |
1447 | } | |
1448 | ||
1449 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1450 | if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */ | |
1451 | Sg_device **tmp_da; | |
1452 | int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP; | |
1453 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1454 | ||
1455 | tmp_da = kmalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL); | |
1456 | if (unlikely(!tmp_da)) | |
1457 | goto expand_failed; | |
1458 | ||
1459 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1460 | memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *)); | |
1461 | memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *)); | |
1462 | old_sg_dev_arr = sg_dev_arr; | |
1463 | sg_dev_arr = tmp_da; | |
1464 | sg_dev_max = tmp_dev_max; | |
1465 | } | |
1466 | ||
1467 | for (k = 0; k < sg_dev_max; k++) | |
1468 | if (!sg_dev_arr[k]) | |
1469 | break; | |
1470 | if (unlikely(k >= SG_MAX_DEVS)) | |
1471 | goto overflow; | |
1472 | ||
1473 | memset(sdp, 0, sizeof(*sdp)); | |
1474 | SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); | |
1475 | sprintf(disk->disk_name, "sg%d", k); | |
1476 | disk->first_minor = k; | |
1477 | sdp->disk = disk; | |
1478 | sdp->device = scsidp; | |
1479 | init_waitqueue_head(&sdp->o_excl_wait); | |
1480 | sdp->sg_tablesize = scsidp->host ? scsidp->host->sg_tablesize : 0; | |
1481 | ||
1482 | sg_nr_dev++; | |
1483 | sg_dev_arr[k] = sdp; | |
1484 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1485 | error = k; | |
1486 | ||
1487 | out: | |
1488 | if (error < 0) | |
1489 | kfree(sdp); | |
1490 | kfree(old_sg_dev_arr); | |
1491 | return error; | |
1492 | ||
1493 | expand_failed: | |
1494 | printk(KERN_WARNING "sg_alloc: device array cannot be resized\n"); | |
1495 | error = -ENOMEM; | |
1496 | goto out; | |
1497 | ||
1498 | overflow: | |
1499 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1500 | printk(KERN_WARNING | |
1501 | "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor " | |
1502 | "number exceeds %d\n", scsidp->host->host_no, scsidp->channel, | |
1503 | scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1); | |
1504 | error = -ENODEV; | |
1505 | goto out; | |
1506 | } | |
1507 | ||
1508 | static int | |
d8539d81 | 1509 | sg_add(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1510 | { |
1511 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
1512 | struct gendisk *disk; | |
1513 | Sg_device *sdp = NULL; | |
1514 | struct cdev * cdev = NULL; | |
1515 | int error, k; | |
1516 | ||
1517 | disk = alloc_disk(1); | |
1518 | if (!disk) { | |
1519 | printk(KERN_WARNING "alloc_disk failed\n"); | |
1520 | return -ENOMEM; | |
1521 | } | |
1522 | disk->major = SCSI_GENERIC_MAJOR; | |
1523 | ||
1524 | error = -ENOMEM; | |
1525 | cdev = cdev_alloc(); | |
1526 | if (!cdev) { | |
1527 | printk(KERN_WARNING "cdev_alloc failed\n"); | |
1528 | goto out; | |
1529 | } | |
1530 | cdev->owner = THIS_MODULE; | |
1531 | cdev->ops = &sg_fops; | |
1532 | ||
1533 | error = sg_alloc(disk, scsidp); | |
1534 | if (error < 0) { | |
1535 | printk(KERN_WARNING "sg_alloc failed\n"); | |
1536 | goto out; | |
1537 | } | |
1538 | k = error; | |
1539 | sdp = sg_dev_arr[k]; | |
1540 | ||
1541 | devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k), | |
1542 | S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, | |
1543 | "%s/generic", scsidp->devfs_name); | |
1544 | error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1); | |
1545 | if (error) { | |
1546 | devfs_remove("%s/generic", scsidp->devfs_name); | |
1547 | goto out; | |
1548 | } | |
1549 | sdp->cdev = cdev; | |
1550 | if (sg_sysfs_valid) { | |
1551 | struct class_device * sg_class_member; | |
1552 | ||
53f46542 | 1553 | sg_class_member = class_device_create(sg_sysfs_class, NULL, |
1da177e4 LT |
1554 | MKDEV(SCSI_GENERIC_MAJOR, k), |
1555 | cl_dev->dev, "%s", | |
1556 | disk->disk_name); | |
1557 | if (IS_ERR(sg_class_member)) | |
1558 | printk(KERN_WARNING "sg_add: " | |
d253878b | 1559 | "class_device_create failed\n"); |
1da177e4 LT |
1560 | class_set_devdata(sg_class_member, sdp); |
1561 | error = sysfs_create_link(&scsidp->sdev_gendev.kobj, | |
1562 | &sg_class_member->kobj, "generic"); | |
1563 | if (error) | |
1564 | printk(KERN_ERR "sg_add: unable to make symlink " | |
1565 | "'generic' back to sg%d\n", k); | |
1566 | } else | |
1567 | printk(KERN_WARNING "sg_add: sg_sys INvalid\n"); | |
1568 | ||
1569 | printk(KERN_NOTICE | |
1570 | "Attached scsi generic sg%d at scsi%d, channel" | |
1571 | " %d, id %d, lun %d, type %d\n", k, | |
1572 | scsidp->host->host_no, scsidp->channel, scsidp->id, | |
1573 | scsidp->lun, scsidp->type); | |
1574 | ||
1575 | return 0; | |
1576 | ||
1577 | out: | |
1578 | put_disk(disk); | |
1579 | if (cdev) | |
1580 | cdev_del(cdev); | |
1581 | return error; | |
1582 | } | |
1583 | ||
1584 | static void | |
d8539d81 | 1585 | sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf) |
1da177e4 LT |
1586 | { |
1587 | struct scsi_device *scsidp = to_scsi_device(cl_dev->dev); | |
1588 | Sg_device *sdp = NULL; | |
1589 | unsigned long iflags; | |
1590 | Sg_fd *sfp; | |
1591 | Sg_fd *tsfp; | |
1592 | Sg_request *srp; | |
1593 | Sg_request *tsrp; | |
1594 | int k, delay; | |
1595 | ||
1596 | if (NULL == sg_dev_arr) | |
1597 | return; | |
1598 | delay = 0; | |
1599 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
1600 | for (k = 0; k < sg_dev_max; k++) { | |
1601 | sdp = sg_dev_arr[k]; | |
1602 | if ((NULL == sdp) || (sdp->device != scsidp)) | |
1603 | continue; /* dirty but lowers nesting */ | |
1604 | if (sdp->headfp) { | |
1605 | sdp->detached = 1; | |
1606 | for (sfp = sdp->headfp; sfp; sfp = tsfp) { | |
1607 | tsfp = sfp->nextfp; | |
1608 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
1609 | tsrp = srp->nextrp; | |
1610 | if (sfp->closed || (0 == sg_srp_done(srp, sfp))) | |
1611 | sg_finish_rem_req(srp); | |
1612 | } | |
1613 | if (sfp->closed) { | |
1614 | scsi_device_put(sdp->device); | |
1615 | __sg_remove_sfp(sdp, sfp); | |
1616 | } else { | |
1617 | delay = 1; | |
1618 | wake_up_interruptible(&sfp->read_wait); | |
1619 | kill_fasync(&sfp->async_qp, SIGPOLL, | |
1620 | POLL_HUP); | |
1621 | } | |
1622 | } | |
1623 | SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d, dirty\n", k)); | |
1624 | if (NULL == sdp->headfp) { | |
1625 | sg_dev_arr[k] = NULL; | |
1626 | } | |
1627 | } else { /* nothing active, simple case */ | |
1628 | SCSI_LOG_TIMEOUT(3, printk("sg_detach: dev=%d\n", k)); | |
1629 | sg_dev_arr[k] = NULL; | |
1630 | } | |
1631 | sg_nr_dev--; | |
1632 | break; | |
1633 | } | |
1634 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
1635 | ||
1636 | if (sdp) { | |
1637 | sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); | |
d253878b | 1638 | class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k)); |
1da177e4 LT |
1639 | cdev_del(sdp->cdev); |
1640 | sdp->cdev = NULL; | |
1641 | devfs_remove("%s/generic", scsidp->devfs_name); | |
1642 | put_disk(sdp->disk); | |
1643 | sdp->disk = NULL; | |
1644 | if (NULL == sdp->headfp) | |
1645 | kfree((char *) sdp); | |
1646 | } | |
1647 | ||
1648 | if (delay) | |
1649 | msleep(10); /* dirty detach so delay device destruction */ | |
1650 | } | |
1651 | ||
1652 | /* Set 'perm' (4th argument) to 0 to disable module_param's definition | |
1653 | * of sysfs parameters (which module_param doesn't yet support). | |
1654 | * Sysfs parameters defined explicitly below. | |
1655 | */ | |
1656 | module_param_named(def_reserved_size, def_reserved_size, int, S_IRUGO); | |
1657 | module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); | |
1658 | ||
1659 | MODULE_AUTHOR("Douglas Gilbert"); | |
1660 | MODULE_DESCRIPTION("SCSI generic (sg) driver"); | |
1661 | MODULE_LICENSE("GPL"); | |
1662 | MODULE_VERSION(SG_VERSION_STR); | |
1663 | ||
1664 | MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); | |
1665 | MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); | |
1666 | ||
1667 | static int __init | |
1668 | init_sg(void) | |
1669 | { | |
1670 | int rc; | |
1671 | ||
1672 | if (def_reserved_size >= 0) | |
1673 | sg_big_buff = def_reserved_size; | |
1674 | ||
1675 | rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1676 | SG_MAX_DEVS, "sg"); | |
1677 | if (rc) | |
1678 | return rc; | |
d253878b | 1679 | sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); |
1da177e4 LT |
1680 | if ( IS_ERR(sg_sysfs_class) ) { |
1681 | rc = PTR_ERR(sg_sysfs_class); | |
1682 | goto err_out; | |
1683 | } | |
1684 | sg_sysfs_valid = 1; | |
1685 | rc = scsi_register_interface(&sg_interface); | |
1686 | if (0 == rc) { | |
1687 | #ifdef CONFIG_SCSI_PROC_FS | |
1688 | sg_proc_init(); | |
1689 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1690 | return 0; | |
1691 | } | |
d253878b | 1692 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1693 | err_out: |
1694 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); | |
1695 | return rc; | |
1696 | } | |
1697 | ||
1698 | static void __exit | |
1699 | exit_sg(void) | |
1700 | { | |
1701 | #ifdef CONFIG_SCSI_PROC_FS | |
1702 | sg_proc_cleanup(); | |
1703 | #endif /* CONFIG_SCSI_PROC_FS */ | |
1704 | scsi_unregister_interface(&sg_interface); | |
d253878b | 1705 | class_destroy(sg_sysfs_class); |
1da177e4 LT |
1706 | sg_sysfs_valid = 0; |
1707 | unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), | |
1708 | SG_MAX_DEVS); | |
1709 | if (sg_dev_arr != NULL) { | |
1710 | kfree((char *) sg_dev_arr); | |
1711 | sg_dev_arr = NULL; | |
1712 | } | |
1713 | sg_dev_max = 0; | |
1714 | } | |
1715 | ||
1716 | static int | |
1717 | sg_start_req(Sg_request * srp) | |
1718 | { | |
1719 | int res; | |
1720 | Sg_fd *sfp = srp->parentfp; | |
1721 | sg_io_hdr_t *hp = &srp->header; | |
1722 | int dxfer_len = (int) hp->dxfer_len; | |
1723 | int dxfer_dir = hp->dxfer_direction; | |
1724 | Sg_scatter_hold *req_schp = &srp->data; | |
1725 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
1726 | ||
1727 | SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len)); | |
1728 | if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) | |
1729 | return 0; | |
1730 | if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) && | |
1731 | (dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) && | |
1732 | (!sfp->parentdp->device->host->unchecked_isa_dma)) { | |
1733 | res = sg_build_direct(srp, sfp, dxfer_len); | |
1734 | if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */ | |
1735 | return res; | |
1736 | } | |
1737 | if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen)) | |
1738 | sg_link_reserve(sfp, srp, dxfer_len); | |
1739 | else { | |
1740 | res = sg_build_indirect(req_schp, sfp, dxfer_len); | |
1741 | if (res) { | |
1742 | sg_remove_scat(req_schp); | |
1743 | return res; | |
1744 | } | |
1745 | } | |
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | static void | |
1750 | sg_finish_rem_req(Sg_request * srp) | |
1751 | { | |
1752 | Sg_fd *sfp = srp->parentfp; | |
1753 | Sg_scatter_hold *req_schp = &srp->data; | |
1754 | ||
1755 | SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); | |
1756 | if (srp->res_used) | |
1757 | sg_unlink_reserve(sfp, srp); | |
1758 | else | |
1759 | sg_remove_scat(req_schp); | |
1760 | sg_remove_request(sfp, srp); | |
1761 | } | |
1762 | ||
1763 | static int | |
1764 | sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) | |
1765 | { | |
1766 | int ret_sz; | |
1767 | int elem_sz = sizeof (struct scatterlist); | |
1768 | int sg_bufflen = tablesize * elem_sz; | |
1769 | int mx_sc_elems = tablesize; | |
1770 | ||
1771 | schp->buffer = sg_page_malloc(sg_bufflen, sfp->low_dma, &ret_sz); | |
1772 | if (!schp->buffer) | |
1773 | return -ENOMEM; | |
1774 | else if (ret_sz != sg_bufflen) { | |
1775 | sg_bufflen = ret_sz; | |
1776 | mx_sc_elems = sg_bufflen / elem_sz; | |
1777 | } | |
1778 | schp->sglist_len = sg_bufflen; | |
1779 | memset(schp->buffer, 0, sg_bufflen); | |
1780 | return mx_sc_elems; /* number of scat_gath elements allocated */ | |
1781 | } | |
1782 | ||
1783 | #ifdef SG_ALLOW_DIO_CODE | |
1784 | /* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */ | |
1785 | /* hopefully this generic code will moved to a library */ | |
1786 | ||
1787 | /* Pin down user pages and put them into a scatter gather list. Returns <= 0 if | |
1788 | - mapping of all pages not successful | |
1789 | - any page is above max_pfn | |
1790 | (i.e., either completely successful or fails) | |
1791 | */ | |
1792 | static int | |
1793 | st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages, | |
1794 | unsigned long uaddr, size_t count, int rw, | |
1795 | unsigned long max_pfn) | |
1796 | { | |
deb92b7e DG |
1797 | unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; |
1798 | unsigned long start = uaddr >> PAGE_SHIFT; | |
1799 | const int nr_pages = end - start; | |
1da177e4 | 1800 | int res, i, j; |
1da177e4 LT |
1801 | struct page **pages; |
1802 | ||
1da177e4 LT |
1803 | /* User attempted Overflow! */ |
1804 | if ((uaddr + count) < uaddr) | |
1805 | return -EINVAL; | |
1806 | ||
1807 | /* Too big */ | |
1808 | if (nr_pages > max_pages) | |
1809 | return -ENOMEM; | |
1810 | ||
1811 | /* Hmm? */ | |
1812 | if (count == 0) | |
1813 | return 0; | |
1814 | ||
1815 | if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL) | |
1816 | return -ENOMEM; | |
1817 | ||
1818 | /* Try to fault in all of the necessary pages */ | |
1819 | down_read(¤t->mm->mmap_sem); | |
1820 | /* rw==READ means read from drive, write into memory area */ | |
1821 | res = get_user_pages( | |
1822 | current, | |
1823 | current->mm, | |
1824 | uaddr, | |
1825 | nr_pages, | |
1826 | rw == READ, | |
1827 | 0, /* don't force */ | |
1828 | pages, | |
1829 | NULL); | |
1830 | up_read(¤t->mm->mmap_sem); | |
1831 | ||
1832 | /* Errors and no page mapped should return here */ | |
1833 | if (res < nr_pages) | |
1834 | goto out_unmap; | |
1835 | ||
1836 | for (i=0; i < nr_pages; i++) { | |
1837 | /* FIXME: flush superflous for rw==READ, | |
1838 | * probably wrong function for rw==WRITE | |
1839 | */ | |
1840 | flush_dcache_page(pages[i]); | |
1841 | if (page_to_pfn(pages[i]) > max_pfn) | |
1842 | goto out_unlock; | |
1843 | /* ?? Is locking needed? I don't think so */ | |
1844 | /* if (TestSetPageLocked(pages[i])) | |
1845 | goto out_unlock; */ | |
1846 | } | |
1847 | ||
1848 | /* Populate the scatter/gather list */ | |
1849 | sgl[0].page = pages[0]; | |
1850 | sgl[0].offset = uaddr & ~PAGE_MASK; | |
1851 | if (nr_pages > 1) { | |
1852 | sgl[0].length = PAGE_SIZE - sgl[0].offset; | |
1853 | count -= sgl[0].length; | |
1854 | for (i=1; i < nr_pages ; i++) { | |
1855 | sgl[i].offset = 0; | |
1856 | sgl[i].page = pages[i]; | |
1857 | sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE; | |
1858 | count -= PAGE_SIZE; | |
1859 | } | |
1860 | } | |
1861 | else { | |
1862 | sgl[0].length = count; | |
1863 | } | |
1864 | ||
1865 | kfree(pages); | |
1866 | return nr_pages; | |
1867 | ||
1868 | out_unlock: | |
1869 | /* for (j=0; j < i; j++) | |
1870 | unlock_page(pages[j]); */ | |
1871 | res = 0; | |
1872 | out_unmap: | |
1873 | if (res > 0) | |
1874 | for (j=0; j < res; j++) | |
1875 | page_cache_release(pages[j]); | |
1876 | kfree(pages); | |
1877 | return res; | |
1878 | } | |
1879 | ||
1880 | ||
1881 | /* And unmap them... */ | |
1882 | static int | |
1883 | st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages, | |
1884 | int dirtied) | |
1885 | { | |
1886 | int i; | |
1887 | ||
1888 | for (i=0; i < nr_pages; i++) { | |
b5810039 NP |
1889 | struct page *page = sgl[i].page; |
1890 | ||
1891 | /* XXX: just for debug. Remove when PageReserved is removed */ | |
1892 | BUG_ON(PageReserved(page)); | |
1893 | if (dirtied) | |
1894 | SetPageDirty(page); | |
1895 | /* unlock_page(page); */ | |
1da177e4 LT |
1896 | /* FIXME: cache flush missing for rw==READ |
1897 | * FIXME: call the correct reference counting function | |
1898 | */ | |
b5810039 | 1899 | page_cache_release(page); |
1da177e4 LT |
1900 | } |
1901 | ||
1902 | return 0; | |
1903 | } | |
1904 | ||
1905 | /* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */ | |
1906 | #endif | |
1907 | ||
1908 | ||
1909 | /* Returns: -ve -> error, 0 -> done, 1 -> try indirect */ | |
1910 | static int | |
1911 | sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len) | |
1912 | { | |
1913 | #ifdef SG_ALLOW_DIO_CODE | |
1914 | sg_io_hdr_t *hp = &srp->header; | |
1915 | Sg_scatter_hold *schp = &srp->data; | |
1916 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1917 | struct scatterlist *sgl; | |
1918 | int mx_sc_elems, res; | |
1919 | struct scsi_device *sdev = sfp->parentdp->device; | |
1920 | ||
1921 | if (((unsigned long)hp->dxferp & | |
1922 | queue_dma_alignment(sdev->request_queue)) != 0) | |
1923 | return 1; | |
1924 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1925 | if (mx_sc_elems <= 0) { | |
1926 | return 1; | |
1927 | } | |
1928 | sgl = (struct scatterlist *)schp->buffer; | |
1929 | res = st_map_user_pages(sgl, mx_sc_elems, (unsigned long)hp->dxferp, dxfer_len, | |
1930 | (SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0, ULONG_MAX); | |
1931 | if (res <= 0) | |
1932 | return 1; | |
1933 | schp->k_use_sg = res; | |
1934 | schp->dio_in_use = 1; | |
1935 | hp->info |= SG_INFO_DIRECT_IO; | |
1936 | return 0; | |
1937 | #else | |
1938 | return 1; | |
1939 | #endif | |
1940 | } | |
1941 | ||
1942 | static int | |
1943 | sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) | |
1944 | { | |
1945 | int ret_sz; | |
1946 | int blk_size = buff_size; | |
1947 | unsigned char *p = NULL; | |
1948 | ||
1949 | if ((blk_size < 0) || (!sfp)) | |
1950 | return -EFAULT; | |
1951 | if (0 == blk_size) | |
1952 | ++blk_size; /* don't know why */ | |
1953 | /* round request up to next highest SG_SECTOR_SZ byte boundary */ | |
1954 | blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK); | |
1955 | SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", | |
1956 | buff_size, blk_size)); | |
1957 | if (blk_size <= SG_SCATTER_SZ) { | |
1958 | p = sg_page_malloc(blk_size, sfp->low_dma, &ret_sz); | |
1959 | if (!p) | |
1960 | return -ENOMEM; | |
1961 | if (blk_size == ret_sz) { /* got it on the first attempt */ | |
1962 | schp->k_use_sg = 0; | |
1963 | schp->buffer = p; | |
1964 | schp->bufflen = blk_size; | |
1965 | schp->b_malloc_len = blk_size; | |
1966 | return 0; | |
1967 | } | |
1968 | } else { | |
1969 | p = sg_page_malloc(SG_SCATTER_SZ, sfp->low_dma, &ret_sz); | |
1970 | if (!p) | |
1971 | return -ENOMEM; | |
1972 | } | |
1973 | /* Want some local declarations, so start new block ... */ | |
1974 | { /* lets try and build a scatter gather list */ | |
1975 | struct scatterlist *sclp; | |
1976 | int k, rem_sz, num; | |
1977 | int mx_sc_elems; | |
1978 | int sg_tablesize = sfp->parentdp->sg_tablesize; | |
1979 | int first = 1; | |
1980 | ||
1981 | /* N.B. ret_sz carried into this block ... */ | |
1982 | mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); | |
1983 | if (mx_sc_elems < 0) | |
1984 | return mx_sc_elems; /* most likely -ENOMEM */ | |
1985 | ||
1986 | for (k = 0, sclp = schp->buffer, rem_sz = blk_size; | |
1987 | (rem_sz > 0) && (k < mx_sc_elems); | |
1988 | ++k, rem_sz -= ret_sz, ++sclp) { | |
1989 | if (first) | |
1990 | first = 0; | |
1991 | else { | |
1992 | num = | |
1993 | (rem_sz > | |
1994 | SG_SCATTER_SZ) ? SG_SCATTER_SZ : rem_sz; | |
1995 | p = sg_page_malloc(num, sfp->low_dma, &ret_sz); | |
1996 | if (!p) | |
1997 | break; | |
1998 | } | |
1999 | sclp->page = virt_to_page(p); | |
2000 | sclp->offset = offset_in_page(p); | |
2001 | sclp->length = ret_sz; | |
2002 | ||
2003 | SCSI_LOG_TIMEOUT(5, printk("sg_build_build: k=%d, a=0x%p, len=%d\n", | |
2004 | k, sg_scatg2virt(sclp), ret_sz)); | |
2005 | } /* end of for loop */ | |
2006 | schp->k_use_sg = k; | |
2007 | SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", k, rem_sz)); | |
2008 | schp->bufflen = blk_size; | |
2009 | if (rem_sz > 0) /* must have failed */ | |
2010 | return -ENOMEM; | |
2011 | } | |
2012 | return 0; | |
2013 | } | |
2014 | ||
2015 | static int | |
2016 | sg_write_xfer(Sg_request * srp) | |
2017 | { | |
2018 | sg_io_hdr_t *hp = &srp->header; | |
2019 | Sg_scatter_hold *schp = &srp->data; | |
2020 | int num_xfer = 0; | |
2021 | int j, k, onum, usglen, ksglen, res; | |
2022 | int iovec_count = (int) hp->iovec_count; | |
2023 | int dxfer_dir = hp->dxfer_direction; | |
2024 | unsigned char *p; | |
2025 | unsigned char __user *up; | |
2026 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2027 | ||
2028 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) || | |
2029 | (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2030 | num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags); | |
2031 | if (schp->bufflen < num_xfer) | |
2032 | num_xfer = schp->bufflen; | |
2033 | } | |
2034 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2035 | (new_interface | |
2036 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2037 | return 0; | |
2038 | ||
2039 | SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2040 | num_xfer, iovec_count, schp->k_use_sg)); | |
2041 | if (iovec_count) { | |
2042 | onum = iovec_count; | |
2043 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2044 | return -EFAULT; | |
2045 | } else | |
2046 | onum = 1; | |
2047 | ||
2048 | if (0 == schp->k_use_sg) { /* kernel has single buffer */ | |
2049 | for (j = 0, p = schp->buffer; j < onum; ++j) { | |
2050 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
2051 | if (res) | |
2052 | return res; | |
2053 | usglen = (num_xfer > usglen) ? usglen : num_xfer; | |
2054 | if (__copy_from_user(p, up, usglen)) | |
2055 | return -EFAULT; | |
2056 | p += usglen; | |
2057 | num_xfer -= usglen; | |
2058 | if (num_xfer <= 0) | |
2059 | return 0; | |
2060 | } | |
2061 | } else { /* kernel using scatter gather list */ | |
2062 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2063 | ||
2064 | ksglen = (int) sclp->length; | |
2065 | p = sg_scatg2virt(sclp); | |
2066 | for (j = 0, k = 0; j < onum; ++j) { | |
2067 | res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up); | |
2068 | if (res) | |
2069 | return res; | |
2070 | ||
2071 | for (; p; ++sclp, ksglen = (int) sclp->length, | |
2072 | p = sg_scatg2virt(sclp)) { | |
2073 | if (usglen <= 0) | |
2074 | break; | |
2075 | if (ksglen > usglen) { | |
2076 | if (usglen >= 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, usglen)) | |
2083 | return -EFAULT; | |
2084 | p += usglen; | |
2085 | ksglen -= usglen; | |
2086 | break; | |
2087 | } else { | |
2088 | if (ksglen >= num_xfer) { | |
2089 | if (__copy_from_user | |
2090 | (p, up, num_xfer)) | |
2091 | return -EFAULT; | |
2092 | return 0; | |
2093 | } | |
2094 | if (__copy_from_user(p, up, ksglen)) | |
2095 | return -EFAULT; | |
2096 | up += ksglen; | |
2097 | usglen -= ksglen; | |
2098 | } | |
2099 | ++k; | |
2100 | if (k >= schp->k_use_sg) | |
2101 | return 0; | |
2102 | } | |
2103 | } | |
2104 | } | |
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | static int | |
2109 | sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind, | |
2110 | int wr_xf, int *countp, unsigned char __user **up) | |
2111 | { | |
2112 | int num_xfer = (int) hp->dxfer_len; | |
2113 | unsigned char __user *p = hp->dxferp; | |
2114 | int count; | |
2115 | ||
2116 | if (0 == sg_num) { | |
2117 | if (wr_xf && ('\0' == hp->interface_id)) | |
2118 | count = (int) hp->flags; /* holds "old" input_size */ | |
2119 | else | |
2120 | count = num_xfer; | |
2121 | } else { | |
2122 | sg_iovec_t iovec; | |
2123 | if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC)) | |
2124 | return -EFAULT; | |
2125 | p = iovec.iov_base; | |
2126 | count = (int) iovec.iov_len; | |
2127 | } | |
2128 | if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)) | |
2129 | return -EFAULT; | |
2130 | if (up) | |
2131 | *up = p; | |
2132 | if (countp) | |
2133 | *countp = count; | |
2134 | return 0; | |
2135 | } | |
2136 | ||
2137 | static void | |
2138 | sg_remove_scat(Sg_scatter_hold * schp) | |
2139 | { | |
2140 | SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); | |
2141 | if (schp->buffer && (schp->sglist_len > 0)) { | |
2142 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2143 | ||
2144 | if (schp->dio_in_use) { | |
2145 | #ifdef SG_ALLOW_DIO_CODE | |
2146 | st_unmap_user_pages(sclp, schp->k_use_sg, TRUE); | |
2147 | #endif | |
2148 | } else { | |
2149 | int k; | |
2150 | ||
2151 | for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); | |
2152 | ++k, ++sclp) { | |
2153 | SCSI_LOG_TIMEOUT(5, printk( | |
2154 | "sg_remove_scat: k=%d, a=0x%p, len=%d\n", | |
2155 | k, sg_scatg2virt(sclp), sclp->length)); | |
2156 | sg_page_free(sg_scatg2virt(sclp), sclp->length); | |
2157 | sclp->page = NULL; | |
2158 | sclp->offset = 0; | |
2159 | sclp->length = 0; | |
2160 | } | |
2161 | } | |
2162 | sg_page_free(schp->buffer, schp->sglist_len); | |
2163 | } else if (schp->buffer) | |
2164 | sg_page_free(schp->buffer, schp->b_malloc_len); | |
2165 | memset(schp, 0, sizeof (*schp)); | |
2166 | } | |
2167 | ||
2168 | static int | |
2169 | sg_read_xfer(Sg_request * srp) | |
2170 | { | |
2171 | sg_io_hdr_t *hp = &srp->header; | |
2172 | Sg_scatter_hold *schp = &srp->data; | |
2173 | int num_xfer = 0; | |
2174 | int j, k, onum, usglen, ksglen, res; | |
2175 | int iovec_count = (int) hp->iovec_count; | |
2176 | int dxfer_dir = hp->dxfer_direction; | |
2177 | unsigned char *p; | |
2178 | unsigned char __user *up; | |
2179 | int new_interface = ('\0' == hp->interface_id) ? 0 : 1; | |
2180 | ||
2181 | if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir) | |
2182 | || (SG_DXFER_TO_FROM_DEV == dxfer_dir)) { | |
2183 | num_xfer = hp->dxfer_len; | |
2184 | if (schp->bufflen < num_xfer) | |
2185 | num_xfer = schp->bufflen; | |
2186 | } | |
2187 | if ((num_xfer <= 0) || (schp->dio_in_use) || | |
2188 | (new_interface | |
2189 | && ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags))) | |
2190 | return 0; | |
2191 | ||
2192 | SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n", | |
2193 | num_xfer, iovec_count, schp->k_use_sg)); | |
2194 | if (iovec_count) { | |
2195 | onum = iovec_count; | |
2196 | if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum)) | |
2197 | return -EFAULT; | |
2198 | } else | |
2199 | onum = 1; | |
2200 | ||
2201 | if (0 == schp->k_use_sg) { /* kernel has single buffer */ | |
2202 | for (j = 0, p = schp->buffer; j < onum; ++j) { | |
2203 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2204 | if (res) | |
2205 | return res; | |
2206 | usglen = (num_xfer > usglen) ? usglen : num_xfer; | |
2207 | if (__copy_to_user(up, p, usglen)) | |
2208 | return -EFAULT; | |
2209 | p += usglen; | |
2210 | num_xfer -= usglen; | |
2211 | if (num_xfer <= 0) | |
2212 | return 0; | |
2213 | } | |
2214 | } else { /* kernel using scatter gather list */ | |
2215 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2216 | ||
2217 | ksglen = (int) sclp->length; | |
2218 | p = sg_scatg2virt(sclp); | |
2219 | for (j = 0, k = 0; j < onum; ++j) { | |
2220 | res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up); | |
2221 | if (res) | |
2222 | return res; | |
2223 | ||
2224 | for (; p; ++sclp, ksglen = (int) sclp->length, | |
2225 | p = sg_scatg2virt(sclp)) { | |
2226 | if (usglen <= 0) | |
2227 | break; | |
2228 | if (ksglen > usglen) { | |
2229 | if (usglen >= 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, usglen)) | |
2236 | return -EFAULT; | |
2237 | p += usglen; | |
2238 | ksglen -= usglen; | |
2239 | break; | |
2240 | } else { | |
2241 | if (ksglen >= num_xfer) { | |
2242 | if (__copy_to_user | |
2243 | (up, p, num_xfer)) | |
2244 | return -EFAULT; | |
2245 | return 0; | |
2246 | } | |
2247 | if (__copy_to_user(up, p, ksglen)) | |
2248 | return -EFAULT; | |
2249 | up += ksglen; | |
2250 | usglen -= ksglen; | |
2251 | } | |
2252 | ++k; | |
2253 | if (k >= schp->k_use_sg) | |
2254 | return 0; | |
2255 | } | |
2256 | } | |
2257 | } | |
2258 | return 0; | |
2259 | } | |
2260 | ||
2261 | static int | |
2262 | sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) | |
2263 | { | |
2264 | Sg_scatter_hold *schp = &srp->data; | |
2265 | ||
2266 | SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", | |
2267 | num_read_xfer)); | |
2268 | if ((!outp) || (num_read_xfer <= 0)) | |
2269 | return 0; | |
2270 | if (schp->k_use_sg > 0) { | |
2271 | int k, num; | |
2272 | struct scatterlist *sclp = (struct scatterlist *) schp->buffer; | |
2273 | ||
2274 | for (k = 0; (k < schp->k_use_sg) && sg_scatg2virt(sclp); | |
2275 | ++k, ++sclp) { | |
2276 | num = (int) sclp->length; | |
2277 | if (num > num_read_xfer) { | |
2278 | if (__copy_to_user | |
2279 | (outp, sg_scatg2virt(sclp), num_read_xfer)) | |
2280 | return -EFAULT; | |
2281 | break; | |
2282 | } else { | |
2283 | if (__copy_to_user | |
2284 | (outp, sg_scatg2virt(sclp), num)) | |
2285 | return -EFAULT; | |
2286 | num_read_xfer -= num; | |
2287 | if (num_read_xfer <= 0) | |
2288 | break; | |
2289 | outp += num; | |
2290 | } | |
2291 | } | |
2292 | } else { | |
2293 | if (__copy_to_user(outp, schp->buffer, num_read_xfer)) | |
2294 | return -EFAULT; | |
2295 | } | |
2296 | return 0; | |
2297 | } | |
2298 | ||
2299 | static void | |
2300 | sg_build_reserve(Sg_fd * sfp, int req_size) | |
2301 | { | |
2302 | Sg_scatter_hold *schp = &sfp->reserve; | |
2303 | ||
2304 | SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); | |
2305 | do { | |
2306 | if (req_size < PAGE_SIZE) | |
2307 | req_size = PAGE_SIZE; | |
2308 | if (0 == sg_build_indirect(schp, sfp, req_size)) | |
2309 | return; | |
2310 | else | |
2311 | sg_remove_scat(schp); | |
2312 | req_size >>= 1; /* divide by 2 */ | |
2313 | } while (req_size > (PAGE_SIZE / 2)); | |
2314 | } | |
2315 | ||
2316 | static void | |
2317 | sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) | |
2318 | { | |
2319 | Sg_scatter_hold *req_schp = &srp->data; | |
2320 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2321 | ||
2322 | srp->res_used = 1; | |
2323 | SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); | |
2324 | size = (size + 1) & (~1); /* round to even for aha1542 */ | |
2325 | if (rsv_schp->k_use_sg > 0) { | |
2326 | int k, num; | |
2327 | int rem = size; | |
2328 | struct scatterlist *sclp = | |
2329 | (struct scatterlist *) rsv_schp->buffer; | |
2330 | ||
2331 | for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sclp) { | |
2332 | num = (int) sclp->length; | |
2333 | if (rem <= num) { | |
2334 | if (0 == k) { | |
2335 | req_schp->k_use_sg = 0; | |
2336 | req_schp->buffer = sg_scatg2virt(sclp); | |
2337 | } else { | |
2338 | sfp->save_scat_len = num; | |
2339 | sclp->length = (unsigned) rem; | |
2340 | req_schp->k_use_sg = k + 1; | |
2341 | req_schp->sglist_len = | |
2342 | rsv_schp->sglist_len; | |
2343 | req_schp->buffer = rsv_schp->buffer; | |
2344 | } | |
2345 | req_schp->bufflen = size; | |
2346 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2347 | break; | |
2348 | } else | |
2349 | rem -= num; | |
2350 | } | |
2351 | if (k >= rsv_schp->k_use_sg) | |
2352 | SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); | |
2353 | } else { | |
2354 | req_schp->k_use_sg = 0; | |
2355 | req_schp->bufflen = size; | |
2356 | req_schp->buffer = rsv_schp->buffer; | |
2357 | req_schp->b_malloc_len = rsv_schp->b_malloc_len; | |
2358 | } | |
2359 | } | |
2360 | ||
2361 | static void | |
2362 | sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) | |
2363 | { | |
2364 | Sg_scatter_hold *req_schp = &srp->data; | |
2365 | Sg_scatter_hold *rsv_schp = &sfp->reserve; | |
2366 | ||
2367 | SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", | |
2368 | (int) req_schp->k_use_sg)); | |
2369 | if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) { | |
2370 | struct scatterlist *sclp = | |
2371 | (struct scatterlist *) rsv_schp->buffer; | |
2372 | ||
2373 | if (sfp->save_scat_len > 0) | |
2374 | (sclp + (req_schp->k_use_sg - 1))->length = | |
2375 | (unsigned) sfp->save_scat_len; | |
2376 | else | |
2377 | SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n")); | |
2378 | } | |
2379 | req_schp->k_use_sg = 0; | |
2380 | req_schp->bufflen = 0; | |
2381 | req_schp->buffer = NULL; | |
2382 | req_schp->sglist_len = 0; | |
2383 | sfp->save_scat_len = 0; | |
2384 | srp->res_used = 0; | |
2385 | } | |
2386 | ||
2387 | static Sg_request * | |
2388 | sg_get_rq_mark(Sg_fd * sfp, int pack_id) | |
2389 | { | |
2390 | Sg_request *resp; | |
2391 | unsigned long iflags; | |
2392 | ||
2393 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2394 | for (resp = sfp->headrp; resp; resp = resp->nextrp) { | |
2395 | /* look for requests that are ready + not SG_IO owned */ | |
2396 | if ((1 == resp->done) && (!resp->sg_io_owned) && | |
2397 | ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { | |
2398 | resp->done = 2; /* guard against other readers */ | |
2399 | break; | |
2400 | } | |
2401 | } | |
2402 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2403 | return resp; | |
2404 | } | |
2405 | ||
2406 | #ifdef CONFIG_SCSI_PROC_FS | |
2407 | static Sg_request * | |
2408 | sg_get_nth_request(Sg_fd * sfp, int nth) | |
2409 | { | |
2410 | Sg_request *resp; | |
2411 | unsigned long iflags; | |
2412 | int k; | |
2413 | ||
2414 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2415 | for (k = 0, resp = sfp->headrp; resp && (k < nth); | |
2416 | ++k, resp = resp->nextrp) ; | |
2417 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2418 | return resp; | |
2419 | } | |
2420 | #endif | |
2421 | ||
2422 | /* always adds to end of list */ | |
2423 | static Sg_request * | |
2424 | sg_add_request(Sg_fd * sfp) | |
2425 | { | |
2426 | int k; | |
2427 | unsigned long iflags; | |
2428 | Sg_request *resp; | |
2429 | Sg_request *rp = sfp->req_arr; | |
2430 | ||
2431 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2432 | resp = sfp->headrp; | |
2433 | if (!resp) { | |
2434 | memset(rp, 0, sizeof (Sg_request)); | |
2435 | rp->parentfp = sfp; | |
2436 | resp = rp; | |
2437 | sfp->headrp = resp; | |
2438 | } else { | |
2439 | if (0 == sfp->cmd_q) | |
2440 | resp = NULL; /* command queuing disallowed */ | |
2441 | else { | |
2442 | for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { | |
2443 | if (!rp->parentfp) | |
2444 | break; | |
2445 | } | |
2446 | if (k < SG_MAX_QUEUE) { | |
2447 | memset(rp, 0, sizeof (Sg_request)); | |
2448 | rp->parentfp = sfp; | |
2449 | while (resp->nextrp) | |
2450 | resp = resp->nextrp; | |
2451 | resp->nextrp = rp; | |
2452 | resp = rp; | |
2453 | } else | |
2454 | resp = NULL; | |
2455 | } | |
2456 | } | |
2457 | if (resp) { | |
2458 | resp->nextrp = NULL; | |
cb59e840 | 2459 | resp->header.duration = jiffies_to_msecs(jiffies); |
1da177e4 LT |
2460 | resp->my_cmdp = NULL; |
2461 | } | |
2462 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2463 | return resp; | |
2464 | } | |
2465 | ||
2466 | /* Return of 1 for found; 0 for not found */ | |
2467 | static int | |
2468 | sg_remove_request(Sg_fd * sfp, Sg_request * srp) | |
2469 | { | |
2470 | Sg_request *prev_rp; | |
2471 | Sg_request *rp; | |
2472 | unsigned long iflags; | |
2473 | int res = 0; | |
2474 | ||
2475 | if ((!sfp) || (!srp) || (!sfp->headrp)) | |
2476 | return res; | |
2477 | write_lock_irqsave(&sfp->rq_list_lock, iflags); | |
521314c1 BK |
2478 | if (srp->my_cmdp) |
2479 | srp->my_cmdp->upper_private_data = NULL; | |
1da177e4 LT |
2480 | prev_rp = sfp->headrp; |
2481 | if (srp == prev_rp) { | |
2482 | sfp->headrp = prev_rp->nextrp; | |
2483 | prev_rp->parentfp = NULL; | |
2484 | res = 1; | |
2485 | } else { | |
2486 | while ((rp = prev_rp->nextrp)) { | |
2487 | if (srp == rp) { | |
2488 | prev_rp->nextrp = rp->nextrp; | |
2489 | rp->parentfp = NULL; | |
2490 | res = 1; | |
2491 | break; | |
2492 | } | |
2493 | prev_rp = rp; | |
2494 | } | |
2495 | } | |
2496 | write_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2497 | return res; | |
2498 | } | |
2499 | ||
2500 | #ifdef CONFIG_SCSI_PROC_FS | |
2501 | static Sg_fd * | |
2502 | sg_get_nth_sfp(Sg_device * sdp, int nth) | |
2503 | { | |
2504 | Sg_fd *resp; | |
2505 | unsigned long iflags; | |
2506 | int k; | |
2507 | ||
2508 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2509 | for (k = 0, resp = sdp->headfp; resp && (k < nth); | |
2510 | ++k, resp = resp->nextfp) ; | |
2511 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2512 | return resp; | |
2513 | } | |
2514 | #endif | |
2515 | ||
2516 | static Sg_fd * | |
2517 | sg_add_sfp(Sg_device * sdp, int dev) | |
2518 | { | |
2519 | Sg_fd *sfp; | |
2520 | unsigned long iflags; | |
2521 | ||
2522 | sfp = (Sg_fd *) sg_page_malloc(sizeof (Sg_fd), 0, NULL); | |
2523 | if (!sfp) | |
2524 | return NULL; | |
2525 | memset(sfp, 0, sizeof (Sg_fd)); | |
2526 | init_waitqueue_head(&sfp->read_wait); | |
2527 | rwlock_init(&sfp->rq_list_lock); | |
2528 | ||
2529 | sfp->timeout = SG_DEFAULT_TIMEOUT; | |
2530 | sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; | |
2531 | sfp->force_packid = SG_DEF_FORCE_PACK_ID; | |
2532 | sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? | |
2533 | sdp->device->host->unchecked_isa_dma : 1; | |
2534 | sfp->cmd_q = SG_DEF_COMMAND_Q; | |
2535 | sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; | |
2536 | sfp->parentdp = sdp; | |
2537 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2538 | if (!sdp->headfp) | |
2539 | sdp->headfp = sfp; | |
2540 | else { /* add to tail of existing list */ | |
2541 | Sg_fd *pfp = sdp->headfp; | |
2542 | while (pfp->nextfp) | |
2543 | pfp = pfp->nextfp; | |
2544 | pfp->nextfp = sfp; | |
2545 | } | |
2546 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2547 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); | |
2548 | sg_build_reserve(sfp, sg_big_buff); | |
2549 | SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", | |
2550 | sfp->reserve.bufflen, sfp->reserve.k_use_sg)); | |
2551 | return sfp; | |
2552 | } | |
2553 | ||
2554 | static void | |
2555 | __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2556 | { | |
2557 | Sg_fd *fp; | |
2558 | Sg_fd *prev_fp; | |
2559 | ||
2560 | prev_fp = sdp->headfp; | |
2561 | if (sfp == prev_fp) | |
2562 | sdp->headfp = prev_fp->nextfp; | |
2563 | else { | |
2564 | while ((fp = prev_fp->nextfp)) { | |
2565 | if (sfp == fp) { | |
2566 | prev_fp->nextfp = fp->nextfp; | |
2567 | break; | |
2568 | } | |
2569 | prev_fp = fp; | |
2570 | } | |
2571 | } | |
2572 | if (sfp->reserve.bufflen > 0) { | |
2573 | SCSI_LOG_TIMEOUT(6, | |
2574 | printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", | |
2575 | (int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg)); | |
2576 | if (sfp->mmap_called) | |
2577 | sg_rb_correct4mmap(&sfp->reserve, 0); /* undo correction */ | |
2578 | sg_remove_scat(&sfp->reserve); | |
2579 | } | |
2580 | sfp->parentdp = NULL; | |
2581 | SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp)); | |
2582 | sg_page_free((char *) sfp, sizeof (Sg_fd)); | |
2583 | } | |
2584 | ||
2585 | /* Returns 0 in normal case, 1 when detached and sdp object removed */ | |
2586 | static int | |
2587 | sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp) | |
2588 | { | |
2589 | Sg_request *srp; | |
2590 | Sg_request *tsrp; | |
2591 | int dirty = 0; | |
2592 | int res = 0; | |
2593 | ||
2594 | for (srp = sfp->headrp; srp; srp = tsrp) { | |
2595 | tsrp = srp->nextrp; | |
2596 | if (sg_srp_done(srp, sfp)) | |
2597 | sg_finish_rem_req(srp); | |
2598 | else | |
2599 | ++dirty; | |
2600 | } | |
2601 | if (0 == dirty) { | |
2602 | unsigned long iflags; | |
2603 | ||
2604 | write_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2605 | __sg_remove_sfp(sdp, sfp); | |
2606 | if (sdp->detached && (NULL == sdp->headfp)) { | |
2607 | int k, maxd; | |
2608 | ||
2609 | maxd = sg_dev_max; | |
2610 | for (k = 0; k < maxd; ++k) { | |
2611 | if (sdp == sg_dev_arr[k]) | |
2612 | break; | |
2613 | } | |
2614 | if (k < maxd) | |
2615 | sg_dev_arr[k] = NULL; | |
2616 | kfree((char *) sdp); | |
2617 | res = 1; | |
2618 | } | |
2619 | write_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2620 | } else { | |
2621 | /* MOD_INC's to inhibit unloading sg and associated adapter driver */ | |
2622 | /* only bump the access_count if we actually succeeded in | |
2623 | * throwing another counter on the host module */ | |
2624 | scsi_device_get(sdp->device); /* XXX: retval ignored? */ | |
2625 | sfp->closed = 1; /* flag dirty state on this fd */ | |
2626 | SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n", | |
2627 | dirty)); | |
2628 | } | |
2629 | return res; | |
2630 | } | |
2631 | ||
2632 | static int | |
2633 | sg_res_in_use(Sg_fd * sfp) | |
2634 | { | |
2635 | const Sg_request *srp; | |
2636 | unsigned long iflags; | |
2637 | ||
2638 | read_lock_irqsave(&sfp->rq_list_lock, iflags); | |
2639 | for (srp = sfp->headrp; srp; srp = srp->nextrp) | |
2640 | if (srp->res_used) | |
2641 | break; | |
2642 | read_unlock_irqrestore(&sfp->rq_list_lock, iflags); | |
2643 | return srp ? 1 : 0; | |
2644 | } | |
2645 | ||
2646 | /* If retSzp==NULL want exact size or fail */ | |
2647 | static char * | |
2648 | sg_page_malloc(int rqSz, int lowDma, int *retSzp) | |
2649 | { | |
2650 | char *resp = NULL; | |
c53033f6 | 2651 | gfp_t page_mask; |
1da177e4 LT |
2652 | int order, a_size; |
2653 | int resSz = rqSz; | |
2654 | ||
2655 | if (rqSz <= 0) | |
2656 | return resp; | |
2657 | ||
2658 | if (lowDma) | |
2659 | page_mask = GFP_ATOMIC | GFP_DMA | __GFP_NOWARN; | |
2660 | else | |
2661 | page_mask = GFP_ATOMIC | __GFP_NOWARN; | |
2662 | ||
2663 | for (order = 0, a_size = PAGE_SIZE; a_size < rqSz; | |
2664 | order++, a_size <<= 1) ; | |
2665 | resp = (char *) __get_free_pages(page_mask, order); | |
2666 | while ((!resp) && order && retSzp) { | |
2667 | --order; | |
2668 | a_size >>= 1; /* divide by 2, until PAGE_SIZE */ | |
2669 | resp = (char *) __get_free_pages(page_mask, order); /* try half */ | |
2670 | resSz = a_size; | |
2671 | } | |
2672 | if (resp) { | |
2673 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2674 | memset(resp, 0, resSz); | |
2675 | if (retSzp) | |
2676 | *retSzp = resSz; | |
2677 | } | |
2678 | return resp; | |
2679 | } | |
2680 | ||
2681 | static void | |
2682 | sg_page_free(char *buff, int size) | |
2683 | { | |
2684 | int order, a_size; | |
2685 | ||
2686 | if (!buff) | |
2687 | return; | |
2688 | for (order = 0, a_size = PAGE_SIZE; a_size < size; | |
2689 | order++, a_size <<= 1) ; | |
2690 | free_pages((unsigned long) buff, order); | |
2691 | } | |
2692 | ||
2693 | #ifndef MAINTENANCE_IN_CMD | |
2694 | #define MAINTENANCE_IN_CMD 0xa3 | |
2695 | #endif | |
2696 | ||
2697 | static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE, | |
2698 | INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12, | |
2699 | READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS, | |
2700 | SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD | |
2701 | }; | |
2702 | ||
2703 | static int | |
2704 | sg_allow_access(unsigned char opcode, char dev_type) | |
2705 | { | |
2706 | int k; | |
2707 | ||
2708 | if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */ | |
2709 | return 1; | |
2710 | for (k = 0; k < sizeof (allow_ops); ++k) { | |
2711 | if (opcode == allow_ops[k]) | |
2712 | return 1; | |
2713 | } | |
2714 | return 0; | |
2715 | } | |
2716 | ||
2717 | #ifdef CONFIG_SCSI_PROC_FS | |
2718 | static int | |
2719 | sg_last_dev(void) | |
2720 | { | |
2721 | int k; | |
2722 | unsigned long iflags; | |
2723 | ||
2724 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2725 | for (k = sg_dev_max - 1; k >= 0; --k) | |
2726 | if (sg_dev_arr[k] && sg_dev_arr[k]->device) | |
2727 | break; | |
2728 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2729 | return k + 1; /* origin 1 */ | |
2730 | } | |
2731 | #endif | |
2732 | ||
2733 | static Sg_device * | |
2734 | sg_get_dev(int dev) | |
2735 | { | |
2736 | Sg_device *sdp = NULL; | |
2737 | unsigned long iflags; | |
2738 | ||
2739 | if (sg_dev_arr && (dev >= 0)) { | |
2740 | read_lock_irqsave(&sg_dev_arr_lock, iflags); | |
2741 | if (dev < sg_dev_max) | |
2742 | sdp = sg_dev_arr[dev]; | |
2743 | read_unlock_irqrestore(&sg_dev_arr_lock, iflags); | |
2744 | } | |
2745 | return sdp; | |
2746 | } | |
2747 | ||
2748 | #ifdef CONFIG_SCSI_PROC_FS | |
2749 | ||
2750 | static struct proc_dir_entry *sg_proc_sgp = NULL; | |
2751 | ||
2752 | static char sg_proc_sg_dirname[] = "scsi/sg"; | |
2753 | ||
2754 | static int sg_proc_seq_show_int(struct seq_file *s, void *v); | |
2755 | ||
2756 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file); | |
2757 | static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2758 | size_t count, loff_t *off); | |
2759 | static struct file_operations adio_fops = { | |
2760 | /* .owner, .read and .llseek added in sg_proc_init() */ | |
2761 | .open = sg_proc_single_open_adio, | |
2762 | .write = sg_proc_write_adio, | |
2763 | .release = single_release, | |
2764 | }; | |
2765 | ||
2766 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); | |
2767 | static ssize_t sg_proc_write_dressz(struct file *filp, | |
2768 | const char __user *buffer, size_t count, loff_t *off); | |
2769 | static struct file_operations dressz_fops = { | |
2770 | .open = sg_proc_single_open_dressz, | |
2771 | .write = sg_proc_write_dressz, | |
2772 | .release = single_release, | |
2773 | }; | |
2774 | ||
2775 | static int sg_proc_seq_show_version(struct seq_file *s, void *v); | |
2776 | static int sg_proc_single_open_version(struct inode *inode, struct file *file); | |
2777 | static struct file_operations version_fops = { | |
2778 | .open = sg_proc_single_open_version, | |
2779 | .release = single_release, | |
2780 | }; | |
2781 | ||
2782 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); | |
2783 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); | |
2784 | static struct file_operations devhdr_fops = { | |
2785 | .open = sg_proc_single_open_devhdr, | |
2786 | .release = single_release, | |
2787 | }; | |
2788 | ||
2789 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v); | |
2790 | static int sg_proc_open_dev(struct inode *inode, struct file *file); | |
2791 | static void * dev_seq_start(struct seq_file *s, loff_t *pos); | |
2792 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); | |
2793 | static void dev_seq_stop(struct seq_file *s, void *v); | |
2794 | static struct file_operations dev_fops = { | |
2795 | .open = sg_proc_open_dev, | |
2796 | .release = seq_release, | |
2797 | }; | |
2798 | static struct seq_operations dev_seq_ops = { | |
2799 | .start = dev_seq_start, | |
2800 | .next = dev_seq_next, | |
2801 | .stop = dev_seq_stop, | |
2802 | .show = sg_proc_seq_show_dev, | |
2803 | }; | |
2804 | ||
2805 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); | |
2806 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file); | |
2807 | static struct file_operations devstrs_fops = { | |
2808 | .open = sg_proc_open_devstrs, | |
2809 | .release = seq_release, | |
2810 | }; | |
2811 | static struct seq_operations devstrs_seq_ops = { | |
2812 | .start = dev_seq_start, | |
2813 | .next = dev_seq_next, | |
2814 | .stop = dev_seq_stop, | |
2815 | .show = sg_proc_seq_show_devstrs, | |
2816 | }; | |
2817 | ||
2818 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v); | |
2819 | static int sg_proc_open_debug(struct inode *inode, struct file *file); | |
2820 | static struct file_operations debug_fops = { | |
2821 | .open = sg_proc_open_debug, | |
2822 | .release = seq_release, | |
2823 | }; | |
2824 | static struct seq_operations debug_seq_ops = { | |
2825 | .start = dev_seq_start, | |
2826 | .next = dev_seq_next, | |
2827 | .stop = dev_seq_stop, | |
2828 | .show = sg_proc_seq_show_debug, | |
2829 | }; | |
2830 | ||
2831 | ||
2832 | struct sg_proc_leaf { | |
2833 | const char * name; | |
2834 | struct file_operations * fops; | |
2835 | }; | |
2836 | ||
2837 | static struct sg_proc_leaf sg_proc_leaf_arr[] = { | |
2838 | {"allow_dio", &adio_fops}, | |
2839 | {"debug", &debug_fops}, | |
2840 | {"def_reserved_size", &dressz_fops}, | |
2841 | {"device_hdr", &devhdr_fops}, | |
2842 | {"devices", &dev_fops}, | |
2843 | {"device_strs", &devstrs_fops}, | |
2844 | {"version", &version_fops} | |
2845 | }; | |
2846 | ||
2847 | static int | |
2848 | sg_proc_init(void) | |
2849 | { | |
2850 | int k, mask; | |
2851 | int num_leaves = | |
2852 | sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); | |
2853 | struct proc_dir_entry *pdep; | |
2854 | struct sg_proc_leaf * leaf; | |
2855 | ||
66600221 | 2856 | sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); |
1da177e4 LT |
2857 | if (!sg_proc_sgp) |
2858 | return 1; | |
2859 | for (k = 0; k < num_leaves; ++k) { | |
2860 | leaf = &sg_proc_leaf_arr[k]; | |
2861 | mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; | |
2862 | pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp); | |
2863 | if (pdep) { | |
2864 | leaf->fops->owner = THIS_MODULE, | |
2865 | leaf->fops->read = seq_read, | |
2866 | leaf->fops->llseek = seq_lseek, | |
2867 | pdep->proc_fops = leaf->fops; | |
2868 | } | |
2869 | } | |
2870 | return 0; | |
2871 | } | |
2872 | ||
2873 | static void | |
2874 | sg_proc_cleanup(void) | |
2875 | { | |
2876 | int k; | |
2877 | int num_leaves = | |
2878 | sizeof (sg_proc_leaf_arr) / sizeof (sg_proc_leaf_arr[0]); | |
2879 | ||
2880 | if (!sg_proc_sgp) | |
2881 | return; | |
2882 | for (k = 0; k < num_leaves; ++k) | |
2883 | remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); | |
2884 | remove_proc_entry(sg_proc_sg_dirname, NULL); | |
2885 | } | |
2886 | ||
2887 | ||
2888 | static int sg_proc_seq_show_int(struct seq_file *s, void *v) | |
2889 | { | |
2890 | seq_printf(s, "%d\n", *((int *)s->private)); | |
2891 | return 0; | |
2892 | } | |
2893 | ||
2894 | static int sg_proc_single_open_adio(struct inode *inode, struct file *file) | |
2895 | { | |
2896 | return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); | |
2897 | } | |
2898 | ||
2899 | static ssize_t | |
2900 | sg_proc_write_adio(struct file *filp, const char __user *buffer, | |
2901 | size_t count, loff_t *off) | |
2902 | { | |
2903 | int num; | |
2904 | char buff[11]; | |
2905 | ||
2906 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2907 | return -EACCES; | |
2908 | num = (count < 10) ? count : 10; | |
2909 | if (copy_from_user(buff, buffer, num)) | |
2910 | return -EFAULT; | |
2911 | buff[num] = '\0'; | |
2912 | sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0; | |
2913 | return count; | |
2914 | } | |
2915 | ||
2916 | static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) | |
2917 | { | |
2918 | return single_open(file, sg_proc_seq_show_int, &sg_big_buff); | |
2919 | } | |
2920 | ||
2921 | static ssize_t | |
2922 | sg_proc_write_dressz(struct file *filp, const char __user *buffer, | |
2923 | size_t count, loff_t *off) | |
2924 | { | |
2925 | int num; | |
2926 | unsigned long k = ULONG_MAX; | |
2927 | char buff[11]; | |
2928 | ||
2929 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2930 | return -EACCES; | |
2931 | num = (count < 10) ? count : 10; | |
2932 | if (copy_from_user(buff, buffer, num)) | |
2933 | return -EFAULT; | |
2934 | buff[num] = '\0'; | |
2935 | k = simple_strtoul(buff, NULL, 10); | |
2936 | if (k <= 1048576) { /* limit "big buff" to 1 MB */ | |
2937 | sg_big_buff = k; | |
2938 | return count; | |
2939 | } | |
2940 | return -ERANGE; | |
2941 | } | |
2942 | ||
2943 | static int sg_proc_seq_show_version(struct seq_file *s, void *v) | |
2944 | { | |
2945 | seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, | |
2946 | sg_version_date); | |
2947 | return 0; | |
2948 | } | |
2949 | ||
2950 | static int sg_proc_single_open_version(struct inode *inode, struct file *file) | |
2951 | { | |
2952 | return single_open(file, sg_proc_seq_show_version, NULL); | |
2953 | } | |
2954 | ||
2955 | static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) | |
2956 | { | |
2957 | seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" | |
2958 | "online\n"); | |
2959 | return 0; | |
2960 | } | |
2961 | ||
2962 | static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) | |
2963 | { | |
2964 | return single_open(file, sg_proc_seq_show_devhdr, NULL); | |
2965 | } | |
2966 | ||
2967 | struct sg_proc_deviter { | |
2968 | loff_t index; | |
2969 | size_t max; | |
2970 | }; | |
2971 | ||
2972 | static void * dev_seq_start(struct seq_file *s, loff_t *pos) | |
2973 | { | |
2974 | struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); | |
2975 | ||
729d70f5 | 2976 | s->private = it; |
1da177e4 LT |
2977 | if (! it) |
2978 | return NULL; | |
729d70f5 | 2979 | |
1da177e4 | 2980 | if (NULL == sg_dev_arr) |
729d70f5 | 2981 | return NULL; |
1da177e4 LT |
2982 | it->index = *pos; |
2983 | it->max = sg_last_dev(); | |
2984 | if (it->index >= it->max) | |
729d70f5 | 2985 | return NULL; |
1da177e4 | 2986 | return it; |
1da177e4 LT |
2987 | } |
2988 | ||
2989 | static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2990 | { | |
729d70f5 | 2991 | struct sg_proc_deviter * it = s->private; |
1da177e4 LT |
2992 | |
2993 | *pos = ++it->index; | |
2994 | return (it->index < it->max) ? it : NULL; | |
2995 | } | |
2996 | ||
2997 | static void dev_seq_stop(struct seq_file *s, void *v) | |
2998 | { | |
729d70f5 | 2999 | kfree(s->private); |
1da177e4 LT |
3000 | } |
3001 | ||
3002 | static int sg_proc_open_dev(struct inode *inode, struct file *file) | |
3003 | { | |
3004 | return seq_open(file, &dev_seq_ops); | |
3005 | } | |
3006 | ||
3007 | static int sg_proc_seq_show_dev(struct seq_file *s, void *v) | |
3008 | { | |
3009 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
3010 | Sg_device *sdp; | |
3011 | struct scsi_device *scsidp; | |
3012 | ||
3013 | sdp = it ? sg_get_dev(it->index) : NULL; | |
3014 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
3015 | seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", | |
3016 | scsidp->host->host_no, scsidp->channel, | |
3017 | scsidp->id, scsidp->lun, (int) scsidp->type, | |
3018 | 1, | |
3019 | (int) scsidp->queue_depth, | |
3020 | (int) scsidp->device_busy, | |
3021 | (int) scsi_device_online(scsidp)); | |
3022 | else | |
3023 | seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); | |
3024 | return 0; | |
3025 | } | |
3026 | ||
3027 | static int sg_proc_open_devstrs(struct inode *inode, struct file *file) | |
3028 | { | |
3029 | return seq_open(file, &devstrs_seq_ops); | |
3030 | } | |
3031 | ||
3032 | static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) | |
3033 | { | |
3034 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
3035 | Sg_device *sdp; | |
3036 | struct scsi_device *scsidp; | |
3037 | ||
3038 | sdp = it ? sg_get_dev(it->index) : NULL; | |
3039 | if (sdp && (scsidp = sdp->device) && (!sdp->detached)) | |
3040 | seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", | |
3041 | scsidp->vendor, scsidp->model, scsidp->rev); | |
3042 | else | |
3043 | seq_printf(s, "<no active device>\n"); | |
3044 | return 0; | |
3045 | } | |
3046 | ||
3047 | static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) | |
3048 | { | |
3049 | int k, m, new_interface, blen, usg; | |
3050 | Sg_request *srp; | |
3051 | Sg_fd *fp; | |
3052 | const sg_io_hdr_t *hp; | |
3053 | const char * cp; | |
cb59e840 | 3054 | unsigned int ms; |
1da177e4 LT |
3055 | |
3056 | for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) { | |
3057 | seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " | |
3058 | "(res)sgat=%d low_dma=%d\n", k + 1, | |
3059 | jiffies_to_msecs(fp->timeout), | |
3060 | fp->reserve.bufflen, | |
3061 | (int) fp->reserve.k_use_sg, | |
3062 | (int) fp->low_dma); | |
3063 | seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", | |
3064 | (int) fp->cmd_q, (int) fp->force_packid, | |
3065 | (int) fp->keep_orphan, (int) fp->closed); | |
3066 | for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) { | |
3067 | hp = &srp->header; | |
3068 | new_interface = (hp->interface_id == '\0') ? 0 : 1; | |
3069 | if (srp->res_used) { | |
3070 | if (new_interface && | |
3071 | (SG_FLAG_MMAP_IO & hp->flags)) | |
3072 | cp = " mmap>> "; | |
3073 | else | |
3074 | cp = " rb>> "; | |
3075 | } else { | |
3076 | if (SG_INFO_DIRECT_IO_MASK & hp->info) | |
3077 | cp = " dio>> "; | |
3078 | else | |
3079 | cp = " "; | |
3080 | } | |
3081 | seq_printf(s, cp); | |
3082 | blen = srp->my_cmdp ? | |
3083 | srp->my_cmdp->sr_bufflen : srp->data.bufflen; | |
3084 | usg = srp->my_cmdp ? | |
3085 | srp->my_cmdp->sr_use_sg : srp->data.k_use_sg; | |
3086 | seq_printf(s, srp->done ? | |
3087 | ((1 == srp->done) ? "rcv:" : "fin:") | |
3088 | : (srp->my_cmdp ? "act:" : "prior:")); | |
3089 | seq_printf(s, " id=%d blen=%d", | |
3090 | srp->header.pack_id, blen); | |
3091 | if (srp->done) | |
3092 | seq_printf(s, " dur=%d", hp->duration); | |
cb59e840 DG |
3093 | else { |
3094 | ms = jiffies_to_msecs(jiffies); | |
1da177e4 | 3095 | seq_printf(s, " t_o/elap=%d/%d", |
cb59e840 DG |
3096 | (new_interface ? hp->timeout : |
3097 | jiffies_to_msecs(fp->timeout)), | |
3098 | (ms > hp->duration ? ms - hp->duration : 0)); | |
3099 | } | |
1da177e4 LT |
3100 | seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, |
3101 | (int) srp->data.cmd_opcode); | |
3102 | } | |
3103 | if (0 == m) | |
3104 | seq_printf(s, " No requests active\n"); | |
3105 | } | |
3106 | } | |
3107 | ||
3108 | static int sg_proc_open_debug(struct inode *inode, struct file *file) | |
3109 | { | |
3110 | return seq_open(file, &debug_seq_ops); | |
3111 | } | |
3112 | ||
3113 | static int sg_proc_seq_show_debug(struct seq_file *s, void *v) | |
3114 | { | |
3115 | struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; | |
3116 | Sg_device *sdp; | |
3117 | ||
3118 | if (it && (0 == it->index)) { | |
3119 | seq_printf(s, "dev_max(currently)=%d max_active_device=%d " | |
3120 | "(origin 1)\n", sg_dev_max, (int)it->max); | |
3121 | seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); | |
3122 | } | |
3123 | sdp = it ? sg_get_dev(it->index) : NULL; | |
3124 | if (sdp) { | |
3125 | struct scsi_device *scsidp = sdp->device; | |
3126 | ||
3127 | if (NULL == scsidp) { | |
3128 | seq_printf(s, "device %d detached ??\n", | |
3129 | (int)it->index); | |
3130 | return 0; | |
3131 | } | |
3132 | ||
3133 | if (sg_get_nth_sfp(sdp, 0)) { | |
3134 | seq_printf(s, " >>> device=%s ", | |
3135 | sdp->disk->disk_name); | |
3136 | if (sdp->detached) | |
3137 | seq_printf(s, "detached pending close "); | |
3138 | else | |
3139 | seq_printf | |
3140 | (s, "scsi%d chan=%d id=%d lun=%d em=%d", | |
3141 | scsidp->host->host_no, | |
3142 | scsidp->channel, scsidp->id, | |
3143 | scsidp->lun, | |
3144 | scsidp->host->hostt->emulated); | |
3145 | seq_printf(s, " sg_tablesize=%d excl=%d\n", | |
3146 | sdp->sg_tablesize, sdp->exclude); | |
3147 | } | |
3148 | sg_proc_debug_helper(s, sdp); | |
3149 | } | |
3150 | return 0; | |
3151 | } | |
3152 | ||
3153 | #endif /* CONFIG_SCSI_PROC_FS */ | |
3154 | ||
3155 | module_init(init_sg); | |
3156 | module_exit(exit_sg); | |
3157 | MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); |