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4b83e99e JA |
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> | |
5 | * | |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and | |
10 | * DVD-RAM devices. | |
11 | * | |
12 | * Theory of operation: | |
13 | * | |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, | |
15 | * such as drivers/scsi/sr.c. This driver can handle read and write requests, | |
16 | * but it doesn't know anything about the special restrictions that apply to | |
17 | * packet writing. One restriction is that write requests must be aligned to | |
18 | * packet boundaries on the physical media, and the size of a write request | |
19 | * must be equal to the packet size. Another restriction is that a | |
20 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read | |
21 | * command, if the previous command was a write. | |
22 | * | |
23 | * The purpose of the packet writing driver is to hide these restrictions from | |
24 | * higher layers, such as file systems, and present a block device that can be | |
25 | * randomly read and written using 2kB-sized blocks. | |
26 | * | |
27 | * The lowest layer in the packet writing driver is the packet I/O scheduler. | |
28 | * Its data is defined by the struct packet_iosched and includes two bio | |
29 | * queues with pending read and write requests. These queues are processed | |
30 | * by the pkt_iosched_process_queue() function. The write requests in this | |
31 | * queue are already properly aligned and sized. This layer is responsible for | |
32 | * issuing the flush cache commands and scheduling the I/O in a good order. | |
33 | * | |
34 | * The next layer transforms unaligned write requests to aligned writes. This | |
35 | * transformation requires reading missing pieces of data from the underlying | |
36 | * block device, assembling the pieces to full packets and queuing them to the | |
37 | * packet I/O scheduler. | |
38 | * | |
39 | * At the top layer there is a custom ->submit_bio function that forwards | |
40 | * read requests directly to the iosched queue and puts write requests in the | |
41 | * unaligned write queue. A kernel thread performs the necessary read | |
42 | * gathering to convert the unaligned writes to aligned writes and then feeds | |
43 | * them to the packet I/O scheduler. | |
44 | * | |
45 | *************************************************************************/ | |
46 | ||
47 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
48 | ||
7da15fb0 | 49 | #include <linux/backing-dev.h> |
4b83e99e | 50 | #include <linux/compat.h> |
7da15fb0 AS |
51 | #include <linux/debugfs.h> |
52 | #include <linux/device.h> | |
4b83e99e | 53 | #include <linux/errno.h> |
4b83e99e | 54 | #include <linux/file.h> |
4b83e99e | 55 | #include <linux/freezer.h> |
7da15fb0 AS |
56 | #include <linux/kernel.h> |
57 | #include <linux/kthread.h> | |
58 | #include <linux/miscdevice.h> | |
59 | #include <linux/module.h> | |
4b83e99e | 60 | #include <linux/mutex.h> |
7da15fb0 AS |
61 | #include <linux/nospec.h> |
62 | #include <linux/pktcdvd.h> | |
63 | #include <linux/proc_fs.h> | |
64 | #include <linux/seq_file.h> | |
4b83e99e | 65 | #include <linux/slab.h> |
7da15fb0 AS |
66 | #include <linux/spinlock.h> |
67 | #include <linux/types.h> | |
68 | #include <linux/uaccess.h> | |
69 | ||
70 | #include <scsi/scsi.h> | |
4b83e99e JA |
71 | #include <scsi/scsi_cmnd.h> |
72 | #include <scsi/scsi_ioctl.h> | |
4b83e99e | 73 | |
046636a4 AS |
74 | #include <asm/unaligned.h> |
75 | ||
4b83e99e JA |
76 | #define DRIVER_NAME "pktcdvd" |
77 | ||
4b83e99e JA |
78 | #define MAX_SPEED 0xffff |
79 | ||
80 | static DEFINE_MUTEX(pktcdvd_mutex); | |
81 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; | |
82 | static struct proc_dir_entry *pkt_proc; | |
83 | static int pktdev_major; | |
84 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; | |
85 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
86 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ | |
87 | static mempool_t psd_pool; | |
88 | static struct bio_set pkt_bio_set; | |
89 | ||
43ba3d4a GKH |
90 | /* /sys/class/pktcdvd */ |
91 | static struct class class_pktcdvd; | |
4b83e99e JA |
92 | static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
93 | ||
94 | /* forward declaration */ | |
95 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
96 | static int pkt_remove_dev(dev_t pkt_dev); | |
4b83e99e JA |
97 | |
98 | static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd) | |
99 | { | |
100 | return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1); | |
101 | } | |
102 | ||
103 | /********************************************************** | |
104 | * sysfs interface for pktcdvd | |
105 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
106 | ||
107 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
108 | stat/reset | |
109 | stat/packets_started | |
110 | stat/packets_finished | |
111 | stat/kb_written | |
112 | stat/kb_read | |
113 | stat/kb_read_gather | |
114 | write_queue/size | |
115 | write_queue/congestion_off | |
116 | write_queue/congestion_on | |
117 | **********************************************************/ | |
118 | ||
119 | static ssize_t packets_started_show(struct device *dev, | |
120 | struct device_attribute *attr, char *buf) | |
121 | { | |
122 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
123 | ||
124 | return sysfs_emit(buf, "%lu\n", pd->stats.pkt_started); | |
125 | } | |
126 | static DEVICE_ATTR_RO(packets_started); | |
127 | ||
128 | static ssize_t packets_finished_show(struct device *dev, | |
129 | struct device_attribute *attr, char *buf) | |
130 | { | |
131 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
132 | ||
133 | return sysfs_emit(buf, "%lu\n", pd->stats.pkt_ended); | |
134 | } | |
135 | static DEVICE_ATTR_RO(packets_finished); | |
136 | ||
137 | static ssize_t kb_written_show(struct device *dev, | |
138 | struct device_attribute *attr, char *buf) | |
139 | { | |
140 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
141 | ||
142 | return sysfs_emit(buf, "%lu\n", pd->stats.secs_w >> 1); | |
143 | } | |
144 | static DEVICE_ATTR_RO(kb_written); | |
145 | ||
146 | static ssize_t kb_read_show(struct device *dev, | |
147 | struct device_attribute *attr, char *buf) | |
148 | { | |
149 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
150 | ||
151 | return sysfs_emit(buf, "%lu\n", pd->stats.secs_r >> 1); | |
152 | } | |
153 | static DEVICE_ATTR_RO(kb_read); | |
154 | ||
155 | static ssize_t kb_read_gather_show(struct device *dev, | |
156 | struct device_attribute *attr, char *buf) | |
157 | { | |
158 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
159 | ||
160 | return sysfs_emit(buf, "%lu\n", pd->stats.secs_rg >> 1); | |
161 | } | |
162 | static DEVICE_ATTR_RO(kb_read_gather); | |
163 | ||
164 | static ssize_t reset_store(struct device *dev, struct device_attribute *attr, | |
165 | const char *buf, size_t len) | |
166 | { | |
167 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
168 | ||
169 | if (len > 0) { | |
170 | pd->stats.pkt_started = 0; | |
171 | pd->stats.pkt_ended = 0; | |
172 | pd->stats.secs_w = 0; | |
173 | pd->stats.secs_rg = 0; | |
174 | pd->stats.secs_r = 0; | |
175 | } | |
176 | return len; | |
177 | } | |
178 | static DEVICE_ATTR_WO(reset); | |
179 | ||
180 | static struct attribute *pkt_stat_attrs[] = { | |
181 | &dev_attr_packets_finished.attr, | |
182 | &dev_attr_packets_started.attr, | |
183 | &dev_attr_kb_read.attr, | |
184 | &dev_attr_kb_written.attr, | |
185 | &dev_attr_kb_read_gather.attr, | |
186 | &dev_attr_reset.attr, | |
187 | NULL, | |
188 | }; | |
189 | ||
190 | static const struct attribute_group pkt_stat_group = { | |
191 | .name = "stat", | |
192 | .attrs = pkt_stat_attrs, | |
193 | }; | |
194 | ||
195 | static ssize_t size_show(struct device *dev, | |
196 | struct device_attribute *attr, char *buf) | |
197 | { | |
198 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
199 | int n; | |
200 | ||
201 | spin_lock(&pd->lock); | |
202 | n = sysfs_emit(buf, "%d\n", pd->bio_queue_size); | |
203 | spin_unlock(&pd->lock); | |
204 | return n; | |
205 | } | |
206 | static DEVICE_ATTR_RO(size); | |
207 | ||
208 | static void init_write_congestion_marks(int* lo, int* hi) | |
209 | { | |
210 | if (*hi > 0) { | |
211 | *hi = max(*hi, 500); | |
212 | *hi = min(*hi, 1000000); | |
213 | if (*lo <= 0) | |
214 | *lo = *hi - 100; | |
215 | else { | |
216 | *lo = min(*lo, *hi - 100); | |
217 | *lo = max(*lo, 100); | |
218 | } | |
219 | } else { | |
220 | *hi = -1; | |
221 | *lo = -1; | |
222 | } | |
223 | } | |
224 | ||
225 | static ssize_t congestion_off_show(struct device *dev, | |
226 | struct device_attribute *attr, char *buf) | |
227 | { | |
228 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
229 | int n; | |
230 | ||
231 | spin_lock(&pd->lock); | |
232 | n = sysfs_emit(buf, "%d\n", pd->write_congestion_off); | |
233 | spin_unlock(&pd->lock); | |
234 | return n; | |
235 | } | |
236 | ||
237 | static ssize_t congestion_off_store(struct device *dev, | |
238 | struct device_attribute *attr, | |
239 | const char *buf, size_t len) | |
240 | { | |
241 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
1a0ddd56 AS |
242 | int val, ret; |
243 | ||
244 | ret = kstrtoint(buf, 10, &val); | |
245 | if (ret) | |
246 | return ret; | |
247 | ||
248 | spin_lock(&pd->lock); | |
249 | pd->write_congestion_off = val; | |
250 | init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on); | |
251 | spin_unlock(&pd->lock); | |
4b83e99e JA |
252 | return len; |
253 | } | |
254 | static DEVICE_ATTR_RW(congestion_off); | |
255 | ||
256 | static ssize_t congestion_on_show(struct device *dev, | |
257 | struct device_attribute *attr, char *buf) | |
258 | { | |
259 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
260 | int n; | |
261 | ||
262 | spin_lock(&pd->lock); | |
263 | n = sysfs_emit(buf, "%d\n", pd->write_congestion_on); | |
264 | spin_unlock(&pd->lock); | |
265 | return n; | |
266 | } | |
267 | ||
268 | static ssize_t congestion_on_store(struct device *dev, | |
269 | struct device_attribute *attr, | |
270 | const char *buf, size_t len) | |
271 | { | |
272 | struct pktcdvd_device *pd = dev_get_drvdata(dev); | |
1a0ddd56 AS |
273 | int val, ret; |
274 | ||
275 | ret = kstrtoint(buf, 10, &val); | |
276 | if (ret) | |
277 | return ret; | |
278 | ||
279 | spin_lock(&pd->lock); | |
280 | pd->write_congestion_on = val; | |
281 | init_write_congestion_marks(&pd->write_congestion_off, &pd->write_congestion_on); | |
282 | spin_unlock(&pd->lock); | |
4b83e99e JA |
283 | return len; |
284 | } | |
285 | static DEVICE_ATTR_RW(congestion_on); | |
286 | ||
287 | static struct attribute *pkt_wq_attrs[] = { | |
288 | &dev_attr_congestion_on.attr, | |
289 | &dev_attr_congestion_off.attr, | |
290 | &dev_attr_size.attr, | |
291 | NULL, | |
292 | }; | |
293 | ||
294 | static const struct attribute_group pkt_wq_group = { | |
295 | .name = "write_queue", | |
296 | .attrs = pkt_wq_attrs, | |
297 | }; | |
298 | ||
299 | static const struct attribute_group *pkt_groups[] = { | |
300 | &pkt_stat_group, | |
301 | &pkt_wq_group, | |
302 | NULL, | |
303 | }; | |
304 | ||
305 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) | |
306 | { | |
43ba3d4a GKH |
307 | if (class_is_registered(&class_pktcdvd)) { |
308 | pd->dev = device_create_with_groups(&class_pktcdvd, NULL, | |
4b83e99e | 309 | MKDEV(0, 0), pd, pkt_groups, |
3a41db53 | 310 | "%s", pd->disk->disk_name); |
4b83e99e JA |
311 | if (IS_ERR(pd->dev)) |
312 | pd->dev = NULL; | |
313 | } | |
314 | } | |
315 | ||
316 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
317 | { | |
43ba3d4a | 318 | if (class_is_registered(&class_pktcdvd)) |
4b83e99e JA |
319 | device_unregister(pd->dev); |
320 | } | |
321 | ||
322 | ||
323 | /******************************************************************** | |
324 | /sys/class/pktcdvd/ | |
325 | add map block device | |
326 | remove unmap packet dev | |
327 | device_map show mappings | |
328 | *******************************************************************/ | |
329 | ||
75a2d422 | 330 | static ssize_t device_map_show(const struct class *c, const struct class_attribute *attr, |
4b83e99e JA |
331 | char *data) |
332 | { | |
333 | int n = 0; | |
334 | int idx; | |
335 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
336 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
337 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
338 | if (!pd) | |
339 | continue; | |
3bb5746c | 340 | n += sysfs_emit_at(data, n, "%s %u:%u %u:%u\n", |
3a41db53 | 341 | pd->disk->disk_name, |
4b83e99e JA |
342 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), |
343 | MAJOR(pd->bdev->bd_dev), | |
344 | MINOR(pd->bdev->bd_dev)); | |
345 | } | |
346 | mutex_unlock(&ctl_mutex); | |
347 | return n; | |
348 | } | |
349 | static CLASS_ATTR_RO(device_map); | |
350 | ||
75a2d422 | 351 | static ssize_t add_store(const struct class *c, const struct class_attribute *attr, |
4b83e99e JA |
352 | const char *buf, size_t count) |
353 | { | |
354 | unsigned int major, minor; | |
355 | ||
356 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { | |
357 | /* pkt_setup_dev() expects caller to hold reference to self */ | |
358 | if (!try_module_get(THIS_MODULE)) | |
359 | return -ENODEV; | |
360 | ||
361 | pkt_setup_dev(MKDEV(major, minor), NULL); | |
362 | ||
363 | module_put(THIS_MODULE); | |
364 | ||
365 | return count; | |
366 | } | |
367 | ||
368 | return -EINVAL; | |
369 | } | |
370 | static CLASS_ATTR_WO(add); | |
371 | ||
75a2d422 | 372 | static ssize_t remove_store(const struct class *c, const struct class_attribute *attr, |
4b83e99e JA |
373 | const char *buf, size_t count) |
374 | { | |
375 | unsigned int major, minor; | |
376 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { | |
377 | pkt_remove_dev(MKDEV(major, minor)); | |
378 | return count; | |
379 | } | |
380 | return -EINVAL; | |
381 | } | |
382 | static CLASS_ATTR_WO(remove); | |
383 | ||
384 | static struct attribute *class_pktcdvd_attrs[] = { | |
385 | &class_attr_add.attr, | |
386 | &class_attr_remove.attr, | |
387 | &class_attr_device_map.attr, | |
388 | NULL, | |
389 | }; | |
390 | ATTRIBUTE_GROUPS(class_pktcdvd); | |
391 | ||
43ba3d4a GKH |
392 | static struct class class_pktcdvd = { |
393 | .name = DRIVER_NAME, | |
394 | .class_groups = class_pktcdvd_groups, | |
395 | }; | |
396 | ||
4b83e99e JA |
397 | static int pkt_sysfs_init(void) |
398 | { | |
4b83e99e JA |
399 | /* |
400 | * create control files in sysfs | |
401 | * /sys/class/pktcdvd/... | |
402 | */ | |
43ba3d4a | 403 | return class_register(&class_pktcdvd); |
4b83e99e JA |
404 | } |
405 | ||
406 | static void pkt_sysfs_cleanup(void) | |
407 | { | |
43ba3d4a | 408 | class_unregister(&class_pktcdvd); |
4b83e99e JA |
409 | } |
410 | ||
411 | /******************************************************************** | |
412 | entries in debugfs | |
413 | ||
414 | /sys/kernel/debug/pktcdvd[0-7]/ | |
415 | info | |
416 | ||
417 | *******************************************************************/ | |
418 | ||
f023faaa AS |
419 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) |
420 | { | |
421 | struct packet_data *pkt; | |
422 | int i; | |
423 | ||
424 | for (i = 0; i < PACKET_NUM_STATES; i++) | |
425 | states[i] = 0; | |
426 | ||
427 | spin_lock(&pd->cdrw.active_list_lock); | |
428 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
429 | states[pkt->state]++; | |
430 | } | |
431 | spin_unlock(&pd->cdrw.active_list_lock); | |
432 | } | |
433 | ||
434 | static int pkt_seq_show(struct seq_file *m, void *p) | |
435 | { | |
436 | struct pktcdvd_device *pd = m->private; | |
437 | char *msg; | |
438 | int states[PACKET_NUM_STATES]; | |
439 | ||
440 | seq_printf(m, "Writer %s mapped to %pg:\n", pd->disk->disk_name, pd->bdev); | |
441 | ||
442 | seq_printf(m, "\nSettings:\n"); | |
443 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
444 | ||
445 | if (pd->settings.write_type == 0) | |
446 | msg = "Packet"; | |
447 | else | |
448 | msg = "Unknown"; | |
449 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
450 | ||
451 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
452 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
453 | ||
454 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
455 | ||
456 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
457 | msg = "Mode 1"; | |
458 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
459 | msg = "Mode 2"; | |
460 | else | |
461 | msg = "Unknown"; | |
462 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
463 | ||
464 | seq_printf(m, "\nStatistics:\n"); | |
465 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
466 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
467 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
468 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
469 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
470 | ||
471 | seq_printf(m, "\nMisc:\n"); | |
472 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
473 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
474 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
475 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
476 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
477 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
478 | ||
479 | seq_printf(m, "\nQueue state:\n"); | |
480 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
481 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
93c8f6f3 | 482 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", pd->current_sector); |
f023faaa AS |
483 | |
484 | pkt_count_states(pd, states); | |
485 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
486 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
487 | ||
488 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", | |
489 | pd->write_congestion_off, | |
490 | pd->write_congestion_on); | |
491 | return 0; | |
492 | } | |
80d994d2 | 493 | DEFINE_SHOW_ATTRIBUTE(pkt_seq); |
4b83e99e JA |
494 | |
495 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
496 | { | |
497 | if (!pkt_debugfs_root) | |
498 | return; | |
3a41db53 | 499 | pd->dfs_d_root = debugfs_create_dir(pd->disk->disk_name, pkt_debugfs_root); |
4b83e99e JA |
500 | if (!pd->dfs_d_root) |
501 | return; | |
502 | ||
80d994d2 AS |
503 | pd->dfs_f_info = debugfs_create_file("info", 0444, pd->dfs_d_root, |
504 | pd, &pkt_seq_fops); | |
4b83e99e JA |
505 | } |
506 | ||
507 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
508 | { | |
509 | if (!pkt_debugfs_root) | |
510 | return; | |
511 | debugfs_remove(pd->dfs_f_info); | |
512 | debugfs_remove(pd->dfs_d_root); | |
513 | pd->dfs_f_info = NULL; | |
514 | pd->dfs_d_root = NULL; | |
515 | } | |
516 | ||
517 | static void pkt_debugfs_init(void) | |
518 | { | |
519 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
520 | } | |
521 | ||
522 | static void pkt_debugfs_cleanup(void) | |
523 | { | |
524 | debugfs_remove(pkt_debugfs_root); | |
525 | pkt_debugfs_root = NULL; | |
526 | } | |
527 | ||
528 | /* ----------------------------------------------------------*/ | |
529 | ||
530 | ||
531 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
532 | { | |
3a41db53 AS |
533 | struct device *ddev = disk_to_dev(pd->disk); |
534 | ||
4b83e99e JA |
535 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); |
536 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
3a41db53 | 537 | dev_dbg(ddev, "queue empty\n"); |
4b83e99e JA |
538 | atomic_set(&pd->iosched.attention, 1); |
539 | wake_up(&pd->wqueue); | |
540 | } | |
541 | } | |
542 | ||
543 | /* | |
544 | * Allocate a packet_data struct | |
545 | */ | |
546 | static struct packet_data *pkt_alloc_packet_data(int frames) | |
547 | { | |
548 | int i; | |
549 | struct packet_data *pkt; | |
550 | ||
551 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); | |
552 | if (!pkt) | |
553 | goto no_pkt; | |
554 | ||
555 | pkt->frames = frames; | |
556 | pkt->w_bio = bio_kmalloc(frames, GFP_KERNEL); | |
557 | if (!pkt->w_bio) | |
558 | goto no_bio; | |
559 | ||
560 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { | |
561 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); | |
562 | if (!pkt->pages[i]) | |
563 | goto no_page; | |
564 | } | |
565 | ||
566 | spin_lock_init(&pkt->lock); | |
567 | bio_list_init(&pkt->orig_bios); | |
568 | ||
569 | for (i = 0; i < frames; i++) { | |
570 | pkt->r_bios[i] = bio_kmalloc(1, GFP_KERNEL); | |
571 | if (!pkt->r_bios[i]) | |
572 | goto no_rd_bio; | |
573 | } | |
574 | ||
575 | return pkt; | |
576 | ||
577 | no_rd_bio: | |
578 | for (i = 0; i < frames; i++) | |
579 | kfree(pkt->r_bios[i]); | |
580 | no_page: | |
581 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) | |
582 | if (pkt->pages[i]) | |
583 | __free_page(pkt->pages[i]); | |
584 | kfree(pkt->w_bio); | |
585 | no_bio: | |
586 | kfree(pkt); | |
587 | no_pkt: | |
588 | return NULL; | |
589 | } | |
590 | ||
591 | /* | |
592 | * Free a packet_data struct | |
593 | */ | |
594 | static void pkt_free_packet_data(struct packet_data *pkt) | |
595 | { | |
596 | int i; | |
597 | ||
598 | for (i = 0; i < pkt->frames; i++) | |
599 | kfree(pkt->r_bios[i]); | |
600 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) | |
601 | __free_page(pkt->pages[i]); | |
602 | kfree(pkt->w_bio); | |
603 | kfree(pkt); | |
604 | } | |
605 | ||
606 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
607 | { | |
608 | struct packet_data *pkt, *next; | |
609 | ||
610 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
611 | ||
612 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
613 | pkt_free_packet_data(pkt); | |
614 | } | |
615 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); | |
616 | } | |
617 | ||
618 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
619 | { | |
620 | struct packet_data *pkt; | |
621 | ||
622 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); | |
623 | ||
624 | while (nr_packets > 0) { | |
625 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); | |
626 | if (!pkt) { | |
627 | pkt_shrink_pktlist(pd); | |
628 | return 0; | |
629 | } | |
630 | pkt->id = nr_packets; | |
631 | pkt->pd = pd; | |
632 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
633 | nr_packets--; | |
634 | } | |
635 | return 1; | |
636 | } | |
637 | ||
638 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) | |
639 | { | |
640 | struct rb_node *n = rb_next(&node->rb_node); | |
641 | if (!n) | |
642 | return NULL; | |
643 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
644 | } | |
645 | ||
646 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
647 | { | |
648 | rb_erase(&node->rb_node, &pd->bio_queue); | |
649 | mempool_free(node, &pd->rb_pool); | |
650 | pd->bio_queue_size--; | |
651 | BUG_ON(pd->bio_queue_size < 0); | |
652 | } | |
653 | ||
654 | /* | |
655 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
656 | */ | |
657 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
658 | { | |
659 | struct rb_node *n = pd->bio_queue.rb_node; | |
660 | struct rb_node *next; | |
661 | struct pkt_rb_node *tmp; | |
662 | ||
663 | if (!n) { | |
664 | BUG_ON(pd->bio_queue_size > 0); | |
665 | return NULL; | |
666 | } | |
667 | ||
668 | for (;;) { | |
669 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
670 | if (s <= tmp->bio->bi_iter.bi_sector) | |
671 | next = n->rb_left; | |
672 | else | |
673 | next = n->rb_right; | |
674 | if (!next) | |
675 | break; | |
676 | n = next; | |
677 | } | |
678 | ||
679 | if (s > tmp->bio->bi_iter.bi_sector) { | |
680 | tmp = pkt_rbtree_next(tmp); | |
681 | if (!tmp) | |
682 | return NULL; | |
683 | } | |
684 | BUG_ON(s > tmp->bio->bi_iter.bi_sector); | |
685 | return tmp; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Insert a node into the pd->bio_queue rb tree. | |
690 | */ | |
691 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
692 | { | |
693 | struct rb_node **p = &pd->bio_queue.rb_node; | |
694 | struct rb_node *parent = NULL; | |
695 | sector_t s = node->bio->bi_iter.bi_sector; | |
696 | struct pkt_rb_node *tmp; | |
697 | ||
698 | while (*p) { | |
699 | parent = *p; | |
700 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
701 | if (s < tmp->bio->bi_iter.bi_sector) | |
702 | p = &(*p)->rb_left; | |
703 | else | |
704 | p = &(*p)->rb_right; | |
705 | } | |
706 | rb_link_node(&node->rb_node, parent, p); | |
707 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
708 | pd->bio_queue_size++; | |
709 | } | |
710 | ||
711 | /* | |
712 | * Send a packet_command to the underlying block device and | |
713 | * wait for completion. | |
714 | */ | |
715 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
716 | { | |
717 | struct request_queue *q = bdev_get_queue(pd->bdev); | |
718 | struct scsi_cmnd *scmd; | |
719 | struct request *rq; | |
720 | int ret = 0; | |
721 | ||
722 | rq = scsi_alloc_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? | |
723 | REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); | |
724 | if (IS_ERR(rq)) | |
725 | return PTR_ERR(rq); | |
726 | scmd = blk_mq_rq_to_pdu(rq); | |
727 | ||
728 | if (cgc->buflen) { | |
729 | ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, | |
730 | GFP_NOIO); | |
731 | if (ret) | |
732 | goto out; | |
733 | } | |
734 | ||
735 | scmd->cmd_len = COMMAND_SIZE(cgc->cmd[0]); | |
736 | memcpy(scmd->cmnd, cgc->cmd, CDROM_PACKET_SIZE); | |
737 | ||
738 | rq->timeout = 60*HZ; | |
739 | if (cgc->quiet) | |
740 | rq->rq_flags |= RQF_QUIET; | |
741 | ||
742 | blk_execute_rq(rq, false); | |
743 | if (scmd->result) | |
744 | ret = -EIO; | |
745 | out: | |
746 | blk_mq_free_request(rq); | |
747 | return ret; | |
748 | } | |
749 | ||
750 | static const char *sense_key_string(__u8 index) | |
751 | { | |
752 | static const char * const info[] = { | |
753 | "No sense", "Recovered error", "Not ready", | |
754 | "Medium error", "Hardware error", "Illegal request", | |
755 | "Unit attention", "Data protect", "Blank check", | |
756 | }; | |
757 | ||
758 | return index < ARRAY_SIZE(info) ? info[index] : "INVALID"; | |
759 | } | |
760 | ||
761 | /* | |
762 | * A generic sense dump / resolve mechanism should be implemented across | |
763 | * all ATAPI + SCSI devices. | |
764 | */ | |
765 | static void pkt_dump_sense(struct pktcdvd_device *pd, | |
766 | struct packet_command *cgc) | |
767 | { | |
3a41db53 | 768 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
769 | struct scsi_sense_hdr *sshdr = cgc->sshdr; |
770 | ||
771 | if (sshdr) | |
3a41db53 | 772 | dev_err(ddev, "%*ph - sense %02x.%02x.%02x (%s)\n", |
4b83e99e JA |
773 | CDROM_PACKET_SIZE, cgc->cmd, |
774 | sshdr->sense_key, sshdr->asc, sshdr->ascq, | |
775 | sense_key_string(sshdr->sense_key)); | |
776 | else | |
3a41db53 | 777 | dev_err(ddev, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd); |
4b83e99e JA |
778 | } |
779 | ||
780 | /* | |
781 | * flush the drive cache to media | |
782 | */ | |
783 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
784 | { | |
785 | struct packet_command cgc; | |
786 | ||
787 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
788 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
789 | cgc.quiet = 1; | |
790 | ||
791 | /* | |
792 | * the IMMED bit -- we default to not setting it, although that | |
793 | * would allow a much faster close, this is safer | |
794 | */ | |
795 | #if 0 | |
796 | cgc.cmd[1] = 1 << 1; | |
797 | #endif | |
798 | return pkt_generic_packet(pd, &cgc); | |
799 | } | |
800 | ||
801 | /* | |
802 | * speed is given as the normal factor, e.g. 4 for 4x | |
803 | */ | |
804 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, | |
805 | unsigned write_speed, unsigned read_speed) | |
806 | { | |
807 | struct packet_command cgc; | |
808 | struct scsi_sense_hdr sshdr; | |
809 | int ret; | |
810 | ||
811 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
812 | cgc.sshdr = &sshdr; | |
813 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
046636a4 AS |
814 | put_unaligned_be16(read_speed, &cgc.cmd[2]); |
815 | put_unaligned_be16(write_speed, &cgc.cmd[4]); | |
4b83e99e JA |
816 | |
817 | ret = pkt_generic_packet(pd, &cgc); | |
818 | if (ret) | |
819 | pkt_dump_sense(pd, &cgc); | |
820 | ||
821 | return ret; | |
822 | } | |
823 | ||
824 | /* | |
825 | * Queue a bio for processing by the low-level CD device. Must be called | |
826 | * from process context. | |
827 | */ | |
828 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) | |
829 | { | |
830 | spin_lock(&pd->iosched.lock); | |
831 | if (bio_data_dir(bio) == READ) | |
832 | bio_list_add(&pd->iosched.read_queue, bio); | |
833 | else | |
834 | bio_list_add(&pd->iosched.write_queue, bio); | |
835 | spin_unlock(&pd->iosched.lock); | |
836 | ||
837 | atomic_set(&pd->iosched.attention, 1); | |
838 | wake_up(&pd->wqueue); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Process the queued read/write requests. This function handles special | |
843 | * requirements for CDRW drives: | |
844 | * - A cache flush command must be inserted before a read request if the | |
845 | * previous request was a write. | |
846 | * - Switching between reading and writing is slow, so don't do it more often | |
847 | * than necessary. | |
848 | * - Optimize for throughput at the expense of latency. This means that streaming | |
849 | * writes will never be interrupted by a read, but if the drive has to seek | |
850 | * before the next write, switch to reading instead if there are any pending | |
851 | * read requests. | |
852 | * - Set the read speed according to current usage pattern. When only reading | |
853 | * from the device, it's best to use the highest possible read speed, but | |
854 | * when switching often between reading and writing, it's better to have the | |
855 | * same read and write speeds. | |
856 | */ | |
857 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
858 | { | |
3a41db53 | 859 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
860 | |
861 | if (atomic_read(&pd->iosched.attention) == 0) | |
862 | return; | |
863 | atomic_set(&pd->iosched.attention, 0); | |
864 | ||
865 | for (;;) { | |
866 | struct bio *bio; | |
867 | int reads_queued, writes_queued; | |
868 | ||
869 | spin_lock(&pd->iosched.lock); | |
870 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); | |
871 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); | |
872 | spin_unlock(&pd->iosched.lock); | |
873 | ||
874 | if (!reads_queued && !writes_queued) | |
875 | break; | |
876 | ||
877 | if (pd->iosched.writing) { | |
878 | int need_write_seek = 1; | |
879 | spin_lock(&pd->iosched.lock); | |
880 | bio = bio_list_peek(&pd->iosched.write_queue); | |
881 | spin_unlock(&pd->iosched.lock); | |
882 | if (bio && (bio->bi_iter.bi_sector == | |
883 | pd->iosched.last_write)) | |
884 | need_write_seek = 0; | |
885 | if (need_write_seek && reads_queued) { | |
886 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
3a41db53 | 887 | dev_dbg(ddev, "write, waiting\n"); |
4b83e99e JA |
888 | break; |
889 | } | |
890 | pkt_flush_cache(pd); | |
891 | pd->iosched.writing = 0; | |
892 | } | |
893 | } else { | |
894 | if (!reads_queued && writes_queued) { | |
895 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
3a41db53 | 896 | dev_dbg(ddev, "read, waiting\n"); |
4b83e99e JA |
897 | break; |
898 | } | |
899 | pd->iosched.writing = 1; | |
900 | } | |
901 | } | |
902 | ||
903 | spin_lock(&pd->iosched.lock); | |
904 | if (pd->iosched.writing) | |
905 | bio = bio_list_pop(&pd->iosched.write_queue); | |
906 | else | |
907 | bio = bio_list_pop(&pd->iosched.read_queue); | |
908 | spin_unlock(&pd->iosched.lock); | |
909 | ||
910 | if (!bio) | |
911 | continue; | |
912 | ||
913 | if (bio_data_dir(bio) == READ) | |
914 | pd->iosched.successive_reads += | |
915 | bio->bi_iter.bi_size >> 10; | |
916 | else { | |
917 | pd->iosched.successive_reads = 0; | |
918 | pd->iosched.last_write = bio_end_sector(bio); | |
919 | } | |
920 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { | |
921 | if (pd->read_speed == pd->write_speed) { | |
922 | pd->read_speed = MAX_SPEED; | |
923 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
924 | } | |
925 | } else { | |
926 | if (pd->read_speed != pd->write_speed) { | |
927 | pd->read_speed = pd->write_speed; | |
928 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
929 | } | |
930 | } | |
931 | ||
932 | atomic_inc(&pd->cdrw.pending_bios); | |
933 | submit_bio_noacct(bio); | |
934 | } | |
935 | } | |
936 | ||
937 | /* | |
938 | * Special care is needed if the underlying block device has a small | |
939 | * max_phys_segments value. | |
940 | */ | |
941 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) | |
942 | { | |
3a41db53 AS |
943 | struct device *ddev = disk_to_dev(pd->disk); |
944 | ||
6a5945a8 | 945 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= queue_max_segments(q)) { |
4b83e99e JA |
946 | /* |
947 | * The cdrom device can handle one segment/frame | |
948 | */ | |
949 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
950 | return 0; | |
6a5945a8 AS |
951 | } |
952 | ||
953 | if ((pd->settings.size << 9) / PAGE_SIZE <= queue_max_segments(q)) { | |
4b83e99e JA |
954 | /* |
955 | * We can handle this case at the expense of some extra memory | |
956 | * copies during write operations | |
957 | */ | |
958 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
959 | return 0; | |
4b83e99e | 960 | } |
6a5945a8 AS |
961 | |
962 | dev_err(ddev, "cdrom max_phys_segments too small\n"); | |
963 | return -EIO; | |
4b83e99e JA |
964 | } |
965 | ||
966 | static void pkt_end_io_read(struct bio *bio) | |
967 | { | |
968 | struct packet_data *pkt = bio->bi_private; | |
969 | struct pktcdvd_device *pd = pkt->pd; | |
970 | BUG_ON(!pd); | |
971 | ||
3a41db53 | 972 | dev_dbg(disk_to_dev(pd->disk), "bio=%p sec0=%llx sec=%llx err=%d\n", |
93c8f6f3 | 973 | bio, pkt->sector, bio->bi_iter.bi_sector, bio->bi_status); |
4b83e99e JA |
974 | |
975 | if (bio->bi_status) | |
976 | atomic_inc(&pkt->io_errors); | |
977 | bio_uninit(bio); | |
978 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
979 | atomic_inc(&pkt->run_sm); | |
980 | wake_up(&pd->wqueue); | |
981 | } | |
982 | pkt_bio_finished(pd); | |
983 | } | |
984 | ||
985 | static void pkt_end_io_packet_write(struct bio *bio) | |
986 | { | |
987 | struct packet_data *pkt = bio->bi_private; | |
988 | struct pktcdvd_device *pd = pkt->pd; | |
989 | BUG_ON(!pd); | |
990 | ||
3a41db53 | 991 | dev_dbg(disk_to_dev(pd->disk), "id=%d, err=%d\n", pkt->id, bio->bi_status); |
4b83e99e JA |
992 | |
993 | pd->stats.pkt_ended++; | |
994 | ||
995 | bio_uninit(bio); | |
996 | pkt_bio_finished(pd); | |
997 | atomic_dec(&pkt->io_wait); | |
998 | atomic_inc(&pkt->run_sm); | |
999 | wake_up(&pd->wqueue); | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * Schedule reads for the holes in a packet | |
1004 | */ | |
1005 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1006 | { | |
3a41db53 | 1007 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
1008 | int frames_read = 0; |
1009 | struct bio *bio; | |
1010 | int f; | |
1011 | char written[PACKET_MAX_SIZE]; | |
1012 | ||
1013 | BUG_ON(bio_list_empty(&pkt->orig_bios)); | |
1014 | ||
1015 | atomic_set(&pkt->io_wait, 0); | |
1016 | atomic_set(&pkt->io_errors, 0); | |
1017 | ||
1018 | /* | |
1019 | * Figure out which frames we need to read before we can write. | |
1020 | */ | |
1021 | memset(written, 0, sizeof(written)); | |
1022 | spin_lock(&pkt->lock); | |
1023 | bio_list_for_each(bio, &pkt->orig_bios) { | |
1024 | int first_frame = (bio->bi_iter.bi_sector - pkt->sector) / | |
1025 | (CD_FRAMESIZE >> 9); | |
1026 | int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE; | |
1027 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); | |
1028 | BUG_ON(first_frame < 0); | |
1029 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1030 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1031 | written[f] = 1; | |
1032 | } | |
1033 | spin_unlock(&pkt->lock); | |
1034 | ||
1035 | if (pkt->cache_valid) { | |
93c8f6f3 | 1036 | dev_dbg(ddev, "zone %llx cached\n", pkt->sector); |
4b83e99e JA |
1037 | goto out_account; |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Schedule reads for missing parts of the packet. | |
1042 | */ | |
1043 | for (f = 0; f < pkt->frames; f++) { | |
1044 | int p, offset; | |
1045 | ||
1046 | if (written[f]) | |
1047 | continue; | |
1048 | ||
1049 | bio = pkt->r_bios[f]; | |
1050 | bio_init(bio, pd->bdev, bio->bi_inline_vecs, 1, REQ_OP_READ); | |
1051 | bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); | |
1052 | bio->bi_end_io = pkt_end_io_read; | |
1053 | bio->bi_private = pkt; | |
1054 | ||
1055 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1056 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
3a41db53 AS |
1057 | dev_dbg(ddev, "Adding frame %d, page:%p offs:%d\n", f, |
1058 | pkt->pages[p], offset); | |
4b83e99e JA |
1059 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) |
1060 | BUG(); | |
1061 | ||
1062 | atomic_inc(&pkt->io_wait); | |
1063 | pkt_queue_bio(pd, bio); | |
1064 | frames_read++; | |
1065 | } | |
1066 | ||
1067 | out_account: | |
93c8f6f3 | 1068 | dev_dbg(ddev, "need %d frames for zone %llx\n", frames_read, pkt->sector); |
4b83e99e JA |
1069 | pd->stats.pkt_started++; |
1070 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Find a packet matching zone, or the least recently used packet if | |
1075 | * there is no match. | |
1076 | */ | |
1077 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1078 | { | |
1079 | struct packet_data *pkt; | |
1080 | ||
1081 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1082 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1083 | list_del_init(&pkt->list); | |
1084 | if (pkt->sector != zone) | |
1085 | pkt->cache_valid = 0; | |
1086 | return pkt; | |
1087 | } | |
1088 | } | |
1089 | BUG(); | |
1090 | return NULL; | |
1091 | } | |
1092 | ||
1093 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1094 | { | |
1095 | if (pkt->cache_valid) { | |
1096 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1097 | } else { | |
1098 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1099 | } | |
1100 | } | |
1101 | ||
3a41db53 AS |
1102 | static inline void pkt_set_state(struct device *ddev, struct packet_data *pkt, |
1103 | enum packet_data_state state) | |
4b83e99e | 1104 | { |
4b83e99e JA |
1105 | static const char *state_name[] = { |
1106 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1107 | }; | |
1108 | enum packet_data_state old_state = pkt->state; | |
3a41db53 AS |
1109 | |
1110 | dev_dbg(ddev, "pkt %2d : s=%6llx %s -> %s\n", | |
93c8f6f3 | 1111 | pkt->id, pkt->sector, state_name[old_state], state_name[state]); |
3a41db53 | 1112 | |
4b83e99e JA |
1113 | pkt->state = state; |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | * Scan the work queue to see if we can start a new packet. | |
1118 | * returns non-zero if any work was done. | |
1119 | */ | |
1120 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1121 | { | |
3a41db53 | 1122 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
1123 | struct packet_data *pkt, *p; |
1124 | struct bio *bio = NULL; | |
1125 | sector_t zone = 0; /* Suppress gcc warning */ | |
1126 | struct pkt_rb_node *node, *first_node; | |
1127 | struct rb_node *n; | |
1128 | ||
1129 | atomic_set(&pd->scan_queue, 0); | |
1130 | ||
1131 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
3a41db53 | 1132 | dev_dbg(ddev, "no pkt\n"); |
4b83e99e JA |
1133 | return 0; |
1134 | } | |
1135 | ||
1136 | /* | |
1137 | * Try to find a zone we are not already working on. | |
1138 | */ | |
1139 | spin_lock(&pd->lock); | |
1140 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1141 | if (!first_node) { | |
1142 | n = rb_first(&pd->bio_queue); | |
1143 | if (n) | |
1144 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1145 | } | |
1146 | node = first_node; | |
1147 | while (node) { | |
1148 | bio = node->bio; | |
1149 | zone = get_zone(bio->bi_iter.bi_sector, pd); | |
1150 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { | |
1151 | if (p->sector == zone) { | |
1152 | bio = NULL; | |
1153 | goto try_next_bio; | |
1154 | } | |
1155 | } | |
1156 | break; | |
1157 | try_next_bio: | |
1158 | node = pkt_rbtree_next(node); | |
1159 | if (!node) { | |
1160 | n = rb_first(&pd->bio_queue); | |
1161 | if (n) | |
1162 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1163 | } | |
1164 | if (node == first_node) | |
1165 | node = NULL; | |
1166 | } | |
1167 | spin_unlock(&pd->lock); | |
1168 | if (!bio) { | |
3a41db53 | 1169 | dev_dbg(ddev, "no bio\n"); |
4b83e99e JA |
1170 | return 0; |
1171 | } | |
1172 | ||
1173 | pkt = pkt_get_packet_data(pd, zone); | |
1174 | ||
1175 | pd->current_sector = zone + pd->settings.size; | |
1176 | pkt->sector = zone; | |
1177 | BUG_ON(pkt->frames != pd->settings.size >> 2); | |
1178 | pkt->write_size = 0; | |
1179 | ||
1180 | /* | |
1181 | * Scan work queue for bios in the same zone and link them | |
1182 | * to this packet. | |
1183 | */ | |
1184 | spin_lock(&pd->lock); | |
93c8f6f3 | 1185 | dev_dbg(ddev, "looking for zone %llx\n", zone); |
4b83e99e | 1186 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
3a41db53 AS |
1187 | sector_t tmp = get_zone(node->bio->bi_iter.bi_sector, pd); |
1188 | ||
4b83e99e | 1189 | bio = node->bio; |
93c8f6f3 | 1190 | dev_dbg(ddev, "found zone=%llx\n", tmp); |
3a41db53 | 1191 | if (tmp != zone) |
4b83e99e JA |
1192 | break; |
1193 | pkt_rbtree_erase(pd, node); | |
1194 | spin_lock(&pkt->lock); | |
1195 | bio_list_add(&pkt->orig_bios, bio); | |
1196 | pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE; | |
1197 | spin_unlock(&pkt->lock); | |
1198 | } | |
1199 | /* check write congestion marks, and if bio_queue_size is | |
1200 | * below, wake up any waiters | |
1201 | */ | |
1202 | if (pd->congested && | |
1203 | pd->bio_queue_size <= pd->write_congestion_off) { | |
1204 | pd->congested = false; | |
1205 | wake_up_var(&pd->congested); | |
1206 | } | |
1207 | spin_unlock(&pd->lock); | |
1208 | ||
1209 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
3a41db53 | 1210 | pkt_set_state(ddev, pkt, PACKET_WAITING_STATE); |
4b83e99e JA |
1211 | atomic_set(&pkt->run_sm, 1); |
1212 | ||
1213 | spin_lock(&pd->cdrw.active_list_lock); | |
1214 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1215 | spin_unlock(&pd->cdrw.active_list_lock); | |
1216 | ||
1217 | return 1; | |
1218 | } | |
1219 | ||
1220 | /** | |
1221 | * bio_list_copy_data - copy contents of data buffers from one chain of bios to | |
1222 | * another | |
1223 | * @src: source bio list | |
1224 | * @dst: destination bio list | |
1225 | * | |
1226 | * Stops when it reaches the end of either the @src list or @dst list - that is, | |
1227 | * copies min(src->bi_size, dst->bi_size) bytes (or the equivalent for lists of | |
1228 | * bios). | |
1229 | */ | |
1230 | static void bio_list_copy_data(struct bio *dst, struct bio *src) | |
1231 | { | |
1232 | struct bvec_iter src_iter = src->bi_iter; | |
1233 | struct bvec_iter dst_iter = dst->bi_iter; | |
1234 | ||
1235 | while (1) { | |
1236 | if (!src_iter.bi_size) { | |
1237 | src = src->bi_next; | |
1238 | if (!src) | |
1239 | break; | |
1240 | ||
1241 | src_iter = src->bi_iter; | |
1242 | } | |
1243 | ||
1244 | if (!dst_iter.bi_size) { | |
1245 | dst = dst->bi_next; | |
1246 | if (!dst) | |
1247 | break; | |
1248 | ||
1249 | dst_iter = dst->bi_iter; | |
1250 | } | |
1251 | ||
1252 | bio_copy_data_iter(dst, &dst_iter, src, &src_iter); | |
1253 | } | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | * Assemble a bio to write one packet and queue the bio for processing | |
1258 | * by the underlying block device. | |
1259 | */ | |
1260 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1261 | { | |
3a41db53 | 1262 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
1263 | int f; |
1264 | ||
1265 | bio_init(pkt->w_bio, pd->bdev, pkt->w_bio->bi_inline_vecs, pkt->frames, | |
1266 | REQ_OP_WRITE); | |
1267 | pkt->w_bio->bi_iter.bi_sector = pkt->sector; | |
1268 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1269 | pkt->w_bio->bi_private = pkt; | |
1270 | ||
1271 | /* XXX: locking? */ | |
1272 | for (f = 0; f < pkt->frames; f++) { | |
1273 | struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; | |
1274 | unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1275 | ||
1276 | if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset)) | |
1277 | BUG(); | |
1278 | } | |
3a41db53 | 1279 | dev_dbg(ddev, "vcnt=%d\n", pkt->w_bio->bi_vcnt); |
4b83e99e JA |
1280 | |
1281 | /* | |
1282 | * Fill-in bvec with data from orig_bios. | |
1283 | */ | |
1284 | spin_lock(&pkt->lock); | |
1285 | bio_list_copy_data(pkt->w_bio, pkt->orig_bios.head); | |
1286 | ||
3a41db53 | 1287 | pkt_set_state(ddev, pkt, PACKET_WRITE_WAIT_STATE); |
4b83e99e JA |
1288 | spin_unlock(&pkt->lock); |
1289 | ||
93c8f6f3 | 1290 | dev_dbg(ddev, "Writing %d frames for zone %llx\n", pkt->write_size, pkt->sector); |
4b83e99e JA |
1291 | |
1292 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) | |
1293 | pkt->cache_valid = 1; | |
1294 | else | |
1295 | pkt->cache_valid = 0; | |
1296 | ||
1297 | /* Start the write request */ | |
1298 | atomic_set(&pkt->io_wait, 1); | |
1299 | pkt_queue_bio(pd, pkt->w_bio); | |
1300 | } | |
1301 | ||
1302 | static void pkt_finish_packet(struct packet_data *pkt, blk_status_t status) | |
1303 | { | |
1304 | struct bio *bio; | |
1305 | ||
1306 | if (status) | |
1307 | pkt->cache_valid = 0; | |
1308 | ||
1309 | /* Finish all bios corresponding to this packet */ | |
1310 | while ((bio = bio_list_pop(&pkt->orig_bios))) { | |
1311 | bio->bi_status = status; | |
1312 | bio_endio(bio); | |
1313 | } | |
1314 | } | |
1315 | ||
1316 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1317 | { | |
3a41db53 AS |
1318 | struct device *ddev = disk_to_dev(pd->disk); |
1319 | ||
1320 | dev_dbg(ddev, "pkt %d\n", pkt->id); | |
4b83e99e JA |
1321 | |
1322 | for (;;) { | |
1323 | switch (pkt->state) { | |
1324 | case PACKET_WAITING_STATE: | |
1325 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1326 | return; | |
1327 | ||
1328 | pkt->sleep_time = 0; | |
1329 | pkt_gather_data(pd, pkt); | |
3a41db53 | 1330 | pkt_set_state(ddev, pkt, PACKET_READ_WAIT_STATE); |
4b83e99e JA |
1331 | break; |
1332 | ||
1333 | case PACKET_READ_WAIT_STATE: | |
1334 | if (atomic_read(&pkt->io_wait) > 0) | |
1335 | return; | |
1336 | ||
1337 | if (atomic_read(&pkt->io_errors) > 0) { | |
3a41db53 | 1338 | pkt_set_state(ddev, pkt, PACKET_RECOVERY_STATE); |
4b83e99e JA |
1339 | } else { |
1340 | pkt_start_write(pd, pkt); | |
1341 | } | |
1342 | break; | |
1343 | ||
1344 | case PACKET_WRITE_WAIT_STATE: | |
1345 | if (atomic_read(&pkt->io_wait) > 0) | |
1346 | return; | |
1347 | ||
1348 | if (!pkt->w_bio->bi_status) { | |
3a41db53 | 1349 | pkt_set_state(ddev, pkt, PACKET_FINISHED_STATE); |
4b83e99e | 1350 | } else { |
3a41db53 | 1351 | pkt_set_state(ddev, pkt, PACKET_RECOVERY_STATE); |
4b83e99e JA |
1352 | } |
1353 | break; | |
1354 | ||
1355 | case PACKET_RECOVERY_STATE: | |
3a41db53 AS |
1356 | dev_dbg(ddev, "No recovery possible\n"); |
1357 | pkt_set_state(ddev, pkt, PACKET_FINISHED_STATE); | |
4b83e99e JA |
1358 | break; |
1359 | ||
1360 | case PACKET_FINISHED_STATE: | |
1361 | pkt_finish_packet(pkt, pkt->w_bio->bi_status); | |
1362 | return; | |
1363 | ||
1364 | default: | |
1365 | BUG(); | |
1366 | break; | |
1367 | } | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1372 | { | |
3a41db53 | 1373 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
1374 | struct packet_data *pkt, *next; |
1375 | ||
1376 | /* | |
1377 | * Run state machine for active packets | |
1378 | */ | |
1379 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1380 | if (atomic_read(&pkt->run_sm) > 0) { | |
1381 | atomic_set(&pkt->run_sm, 0); | |
1382 | pkt_run_state_machine(pd, pkt); | |
1383 | } | |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * Move no longer active packets to the free list | |
1388 | */ | |
1389 | spin_lock(&pd->cdrw.active_list_lock); | |
1390 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1391 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1392 | list_del(&pkt->list); | |
1393 | pkt_put_packet_data(pd, pkt); | |
3a41db53 | 1394 | pkt_set_state(ddev, pkt, PACKET_IDLE_STATE); |
4b83e99e JA |
1395 | atomic_set(&pd->scan_queue, 1); |
1396 | } | |
1397 | } | |
1398 | spin_unlock(&pd->cdrw.active_list_lock); | |
1399 | } | |
1400 | ||
4b83e99e JA |
1401 | /* |
1402 | * kcdrwd is woken up when writes have been queued for one of our | |
1403 | * registered devices | |
1404 | */ | |
1405 | static int kcdrwd(void *foobar) | |
1406 | { | |
1407 | struct pktcdvd_device *pd = foobar; | |
3a41db53 | 1408 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e | 1409 | struct packet_data *pkt; |
3a41db53 | 1410 | int states[PACKET_NUM_STATES]; |
4b83e99e JA |
1411 | long min_sleep_time, residue; |
1412 | ||
1413 | set_user_nice(current, MIN_NICE); | |
1414 | set_freezable(); | |
1415 | ||
1416 | for (;;) { | |
1417 | DECLARE_WAITQUEUE(wait, current); | |
1418 | ||
1419 | /* | |
1420 | * Wait until there is something to do | |
1421 | */ | |
1422 | add_wait_queue(&pd->wqueue, &wait); | |
1423 | for (;;) { | |
1424 | set_current_state(TASK_INTERRUPTIBLE); | |
1425 | ||
1426 | /* Check if we need to run pkt_handle_queue */ | |
1427 | if (atomic_read(&pd->scan_queue) > 0) | |
1428 | goto work_to_do; | |
1429 | ||
1430 | /* Check if we need to run the state machine for some packet */ | |
1431 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1432 | if (atomic_read(&pkt->run_sm) > 0) | |
1433 | goto work_to_do; | |
1434 | } | |
1435 | ||
1436 | /* Check if we need to process the iosched queues */ | |
1437 | if (atomic_read(&pd->iosched.attention) != 0) | |
1438 | goto work_to_do; | |
1439 | ||
1440 | /* Otherwise, go to sleep */ | |
3a41db53 AS |
1441 | pkt_count_states(pd, states); |
1442 | dev_dbg(ddev, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
1443 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
4b83e99e JA |
1444 | |
1445 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1446 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1447 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1448 | min_sleep_time = pkt->sleep_time; | |
1449 | } | |
1450 | ||
3a41db53 | 1451 | dev_dbg(ddev, "sleeping\n"); |
4b83e99e | 1452 | residue = schedule_timeout(min_sleep_time); |
3a41db53 | 1453 | dev_dbg(ddev, "wake up\n"); |
4b83e99e JA |
1454 | |
1455 | /* make swsusp happy with our thread */ | |
1456 | try_to_freeze(); | |
1457 | ||
1458 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1459 | if (!pkt->sleep_time) | |
1460 | continue; | |
1461 | pkt->sleep_time -= min_sleep_time - residue; | |
1462 | if (pkt->sleep_time <= 0) { | |
1463 | pkt->sleep_time = 0; | |
1464 | atomic_inc(&pkt->run_sm); | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | if (kthread_should_stop()) | |
1469 | break; | |
1470 | } | |
1471 | work_to_do: | |
1472 | set_current_state(TASK_RUNNING); | |
1473 | remove_wait_queue(&pd->wqueue, &wait); | |
1474 | ||
1475 | if (kthread_should_stop()) | |
1476 | break; | |
1477 | ||
1478 | /* | |
1479 | * if pkt_handle_queue returns true, we can queue | |
1480 | * another request. | |
1481 | */ | |
1482 | while (pkt_handle_queue(pd)) | |
1483 | ; | |
1484 | ||
1485 | /* | |
1486 | * Handle packet state machine | |
1487 | */ | |
1488 | pkt_handle_packets(pd); | |
1489 | ||
1490 | /* | |
1491 | * Handle iosched queues | |
1492 | */ | |
1493 | pkt_iosched_process_queue(pd); | |
1494 | } | |
1495 | ||
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1500 | { | |
3a41db53 | 1501 | dev_info(disk_to_dev(pd->disk), "%s packets, %u blocks, Mode-%c disc\n", |
4b83e99e JA |
1502 | pd->settings.fp ? "Fixed" : "Variable", |
1503 | pd->settings.size >> 2, | |
1504 | pd->settings.block_mode == 8 ? '1' : '2'); | |
1505 | } | |
1506 | ||
1507 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1508 | { | |
1509 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1510 | ||
1511 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1512 | cgc->cmd[2] = page_code | (page_control << 6); | |
046636a4 | 1513 | put_unaligned_be16(cgc->buflen, &cgc->cmd[7]); |
4b83e99e JA |
1514 | cgc->data_direction = CGC_DATA_READ; |
1515 | return pkt_generic_packet(pd, cgc); | |
1516 | } | |
1517 | ||
1518 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1519 | { | |
1520 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1521 | memset(cgc->buffer, 0, 2); | |
1522 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1523 | cgc->cmd[1] = 0x10; /* PF */ | |
046636a4 | 1524 | put_unaligned_be16(cgc->buflen, &cgc->cmd[7]); |
4b83e99e JA |
1525 | cgc->data_direction = CGC_DATA_WRITE; |
1526 | return pkt_generic_packet(pd, cgc); | |
1527 | } | |
1528 | ||
1529 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1530 | { | |
1531 | struct packet_command cgc; | |
1532 | int ret; | |
1533 | ||
1534 | /* set up command and get the disc info */ | |
1535 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1536 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1537 | cgc.cmd[8] = cgc.buflen = 2; | |
1538 | cgc.quiet = 1; | |
1539 | ||
1540 | ret = pkt_generic_packet(pd, &cgc); | |
1541 | if (ret) | |
1542 | return ret; | |
1543 | ||
1544 | /* not all drives have the same disc_info length, so requeue | |
1545 | * packet with the length the drive tells us it can supply | |
1546 | */ | |
1547 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1548 | sizeof(di->disc_information_length); | |
1549 | ||
1550 | if (cgc.buflen > sizeof(disc_information)) | |
1551 | cgc.buflen = sizeof(disc_information); | |
1552 | ||
1553 | cgc.cmd[8] = cgc.buflen; | |
1554 | return pkt_generic_packet(pd, &cgc); | |
1555 | } | |
1556 | ||
1557 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1558 | { | |
1559 | struct packet_command cgc; | |
1560 | int ret; | |
1561 | ||
1562 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1563 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1564 | cgc.cmd[1] = type & 3; | |
046636a4 | 1565 | put_unaligned_be16(track, &cgc.cmd[4]); |
4b83e99e JA |
1566 | cgc.cmd[8] = 8; |
1567 | cgc.quiet = 1; | |
1568 | ||
1569 | ret = pkt_generic_packet(pd, &cgc); | |
1570 | if (ret) | |
1571 | return ret; | |
1572 | ||
1573 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1574 | sizeof(ti->track_information_length); | |
1575 | ||
1576 | if (cgc.buflen > sizeof(track_information)) | |
1577 | cgc.buflen = sizeof(track_information); | |
1578 | ||
1579 | cgc.cmd[8] = cgc.buflen; | |
1580 | return pkt_generic_packet(pd, &cgc); | |
1581 | } | |
1582 | ||
1583 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, | |
1584 | long *last_written) | |
1585 | { | |
1586 | disc_information di; | |
1587 | track_information ti; | |
1588 | __u32 last_track; | |
1589 | int ret; | |
1590 | ||
1591 | ret = pkt_get_disc_info(pd, &di); | |
1592 | if (ret) | |
1593 | return ret; | |
1594 | ||
1595 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1596 | ret = pkt_get_track_info(pd, last_track, 1, &ti); | |
1597 | if (ret) | |
1598 | return ret; | |
1599 | ||
1600 | /* if this track is blank, try the previous. */ | |
1601 | if (ti.blank) { | |
1602 | last_track--; | |
1603 | ret = pkt_get_track_info(pd, last_track, 1, &ti); | |
1604 | if (ret) | |
1605 | return ret; | |
1606 | } | |
1607 | ||
1608 | /* if last recorded field is valid, return it. */ | |
1609 | if (ti.lra_v) { | |
1610 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1611 | } else { | |
1612 | /* make it up instead */ | |
1613 | *last_written = be32_to_cpu(ti.track_start) + | |
1614 | be32_to_cpu(ti.track_size); | |
1615 | if (ti.free_blocks) | |
1616 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1617 | } | |
1618 | return 0; | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * write mode select package based on pd->settings | |
1623 | */ | |
1624 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) | |
1625 | { | |
3a41db53 | 1626 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
1627 | struct packet_command cgc; |
1628 | struct scsi_sense_hdr sshdr; | |
1629 | write_param_page *wp; | |
1630 | char buffer[128]; | |
1631 | int ret, size; | |
1632 | ||
1633 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1634 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1635 | return 0; | |
1636 | ||
1637 | memset(buffer, 0, sizeof(buffer)); | |
1638 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1639 | cgc.sshdr = &sshdr; | |
1640 | ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0); | |
1641 | if (ret) { | |
1642 | pkt_dump_sense(pd, &cgc); | |
1643 | return ret; | |
1644 | } | |
1645 | ||
046636a4 AS |
1646 | size = 2 + get_unaligned_be16(&buffer[0]); |
1647 | pd->mode_offset = get_unaligned_be16(&buffer[6]); | |
4b83e99e JA |
1648 | if (size > sizeof(buffer)) |
1649 | size = sizeof(buffer); | |
1650 | ||
1651 | /* | |
1652 | * now get it all | |
1653 | */ | |
1654 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1655 | cgc.sshdr = &sshdr; | |
1656 | ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0); | |
1657 | if (ret) { | |
1658 | pkt_dump_sense(pd, &cgc); | |
1659 | return ret; | |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * write page is offset header + block descriptor length | |
1664 | */ | |
1665 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1666 | ||
1667 | wp->fp = pd->settings.fp; | |
1668 | wp->track_mode = pd->settings.track_mode; | |
1669 | wp->write_type = pd->settings.write_type; | |
1670 | wp->data_block_type = pd->settings.block_mode; | |
1671 | ||
1672 | wp->multi_session = 0; | |
1673 | ||
1674 | #ifdef PACKET_USE_LS | |
1675 | wp->link_size = 7; | |
1676 | wp->ls_v = 1; | |
1677 | #endif | |
1678 | ||
1679 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1680 | wp->session_format = 0; | |
1681 | wp->subhdr2 = 0x20; | |
1682 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1683 | wp->session_format = 0x20; | |
1684 | wp->subhdr2 = 8; | |
1685 | #if 0 | |
1686 | wp->mcn[0] = 0x80; | |
1687 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1688 | #endif | |
1689 | } else { | |
1690 | /* | |
1691 | * paranoia | |
1692 | */ | |
3a41db53 | 1693 | dev_err(ddev, "write mode wrong %d\n", wp->data_block_type); |
4b83e99e JA |
1694 | return 1; |
1695 | } | |
1696 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1697 | ||
1698 | cgc.buflen = cgc.cmd[8] = size; | |
1699 | ret = pkt_mode_select(pd, &cgc); | |
1700 | if (ret) { | |
1701 | pkt_dump_sense(pd, &cgc); | |
1702 | return ret; | |
1703 | } | |
1704 | ||
1705 | pkt_print_settings(pd); | |
1706 | return 0; | |
1707 | } | |
1708 | ||
1709 | /* | |
1710 | * 1 -- we can write to this track, 0 -- we can't | |
1711 | */ | |
1712 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) | |
1713 | { | |
3a41db53 AS |
1714 | struct device *ddev = disk_to_dev(pd->disk); |
1715 | ||
4b83e99e JA |
1716 | switch (pd->mmc3_profile) { |
1717 | case 0x1a: /* DVD+RW */ | |
1718 | case 0x12: /* DVD-RAM */ | |
1719 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1720 | return 1; | |
1721 | default: | |
1722 | break; | |
1723 | } | |
1724 | ||
1725 | if (!ti->packet || !ti->fp) | |
1726 | return 0; | |
1727 | ||
1728 | /* | |
1729 | * "good" settings as per Mt Fuji. | |
1730 | */ | |
1731 | if (ti->rt == 0 && ti->blank == 0) | |
1732 | return 1; | |
1733 | ||
1734 | if (ti->rt == 0 && ti->blank == 1) | |
1735 | return 1; | |
1736 | ||
1737 | if (ti->rt == 1 && ti->blank == 0) | |
1738 | return 1; | |
1739 | ||
3a41db53 | 1740 | dev_err(ddev, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
4b83e99e JA |
1741 | return 0; |
1742 | } | |
1743 | ||
1744 | /* | |
1745 | * 1 -- we can write to this disc, 0 -- we can't | |
1746 | */ | |
1747 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) | |
1748 | { | |
3a41db53 AS |
1749 | struct device *ddev = disk_to_dev(pd->disk); |
1750 | ||
4b83e99e JA |
1751 | switch (pd->mmc3_profile) { |
1752 | case 0x0a: /* CD-RW */ | |
1753 | case 0xffff: /* MMC3 not supported */ | |
1754 | break; | |
1755 | case 0x1a: /* DVD+RW */ | |
1756 | case 0x13: /* DVD-RW */ | |
1757 | case 0x12: /* DVD-RAM */ | |
1758 | return 1; | |
1759 | default: | |
3a41db53 | 1760 | dev_dbg(ddev, "Wrong disc profile (%x)\n", pd->mmc3_profile); |
4b83e99e JA |
1761 | return 0; |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * for disc type 0xff we should probably reserve a new track. | |
1766 | * but i'm not sure, should we leave this to user apps? probably. | |
1767 | */ | |
1768 | if (di->disc_type == 0xff) { | |
3a41db53 | 1769 | dev_notice(ddev, "unknown disc - no track?\n"); |
4b83e99e JA |
1770 | return 0; |
1771 | } | |
1772 | ||
1773 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
3a41db53 | 1774 | dev_err(ddev, "wrong disc type (%x)\n", di->disc_type); |
4b83e99e JA |
1775 | return 0; |
1776 | } | |
1777 | ||
1778 | if (di->erasable == 0) { | |
3a41db53 | 1779 | dev_err(ddev, "disc not erasable\n"); |
4b83e99e JA |
1780 | return 0; |
1781 | } | |
1782 | ||
1783 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
3a41db53 | 1784 | dev_err(ddev, "can't write to last track (reserved)\n"); |
4b83e99e JA |
1785 | return 0; |
1786 | } | |
1787 | ||
1788 | return 1; | |
1789 | } | |
1790 | ||
1791 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) | |
1792 | { | |
3a41db53 | 1793 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
1794 | struct packet_command cgc; |
1795 | unsigned char buf[12]; | |
1796 | disc_information di; | |
1797 | track_information ti; | |
1798 | int ret, track; | |
1799 | ||
1800 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1801 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1802 | cgc.cmd[8] = 8; | |
1803 | ret = pkt_generic_packet(pd, &cgc); | |
046636a4 | 1804 | pd->mmc3_profile = ret ? 0xffff : get_unaligned_be16(&buf[6]); |
4b83e99e JA |
1805 | |
1806 | memset(&di, 0, sizeof(disc_information)); | |
1807 | memset(&ti, 0, sizeof(track_information)); | |
1808 | ||
1809 | ret = pkt_get_disc_info(pd, &di); | |
1810 | if (ret) { | |
3a41db53 | 1811 | dev_err(ddev, "failed get_disc\n"); |
4b83e99e JA |
1812 | return ret; |
1813 | } | |
1814 | ||
1815 | if (!pkt_writable_disc(pd, &di)) | |
1816 | return -EROFS; | |
1817 | ||
1818 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; | |
1819 | ||
1820 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1821 | ret = pkt_get_track_info(pd, track, 1, &ti); | |
1822 | if (ret) { | |
3a41db53 | 1823 | dev_err(ddev, "failed get_track\n"); |
4b83e99e JA |
1824 | return ret; |
1825 | } | |
1826 | ||
1827 | if (!pkt_writable_track(pd, &ti)) { | |
3a41db53 | 1828 | dev_err(ddev, "can't write to this track\n"); |
4b83e99e JA |
1829 | return -EROFS; |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * we keep packet size in 512 byte units, makes it easier to | |
1834 | * deal with request calculations. | |
1835 | */ | |
1836 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1837 | if (pd->settings.size == 0) { | |
3a41db53 | 1838 | dev_notice(ddev, "detected zero packet size!\n"); |
4b83e99e JA |
1839 | return -ENXIO; |
1840 | } | |
1841 | if (pd->settings.size > PACKET_MAX_SECTORS) { | |
3a41db53 | 1842 | dev_err(ddev, "packet size is too big\n"); |
4b83e99e JA |
1843 | return -EROFS; |
1844 | } | |
1845 | pd->settings.fp = ti.fp; | |
1846 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1847 | ||
1848 | if (ti.nwa_v) { | |
1849 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1850 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * in theory we could use lra on -RW media as well and just zero | |
1855 | * blocks that haven't been written yet, but in practice that | |
1856 | * is just a no-go. we'll use that for -R, naturally. | |
1857 | */ | |
1858 | if (ti.lra_v) { | |
1859 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1860 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1861 | } else { | |
1862 | pd->lra = 0xffffffff; | |
1863 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * fine for now | |
1868 | */ | |
1869 | pd->settings.link_loss = 7; | |
1870 | pd->settings.write_type = 0; /* packet */ | |
1871 | pd->settings.track_mode = ti.track_mode; | |
1872 | ||
1873 | /* | |
1874 | * mode1 or mode2 disc | |
1875 | */ | |
1876 | switch (ti.data_mode) { | |
1877 | case PACKET_MODE1: | |
1878 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1879 | break; | |
1880 | case PACKET_MODE2: | |
1881 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1882 | break; | |
1883 | default: | |
3a41db53 | 1884 | dev_err(ddev, "unknown data mode\n"); |
4b83e99e JA |
1885 | return -EROFS; |
1886 | } | |
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | /* | |
1891 | * enable/disable write caching on drive | |
1892 | */ | |
f5bdc61e | 1893 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd) |
4b83e99e | 1894 | { |
3a41db53 | 1895 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
1896 | struct packet_command cgc; |
1897 | struct scsi_sense_hdr sshdr; | |
1898 | unsigned char buf[64]; | |
f5bdc61e | 1899 | bool set = IS_ENABLED(CONFIG_CDROM_PKTCDVD_WCACHE); |
4b83e99e JA |
1900 | int ret; |
1901 | ||
1902 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1903 | cgc.sshdr = &sshdr; | |
1904 | cgc.buflen = pd->mode_offset + 12; | |
1905 | ||
1906 | /* | |
1907 | * caching mode page might not be there, so quiet this command | |
1908 | */ | |
1909 | cgc.quiet = 1; | |
1910 | ||
1911 | ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0); | |
1912 | if (ret) | |
1913 | return ret; | |
1914 | ||
f5bdc61e TH |
1915 | /* |
1916 | * use drive write caching -- we need deferred error handling to be | |
1917 | * able to successfully recover with this option (drive will return good | |
1918 | * status as soon as the cdb is validated). | |
1919 | */ | |
1920 | buf[pd->mode_offset + 10] |= (set << 2); | |
4b83e99e | 1921 | |
046636a4 | 1922 | cgc.buflen = cgc.cmd[8] = 2 + get_unaligned_be16(&buf[0]); |
4b83e99e JA |
1923 | ret = pkt_mode_select(pd, &cgc); |
1924 | if (ret) { | |
3a41db53 | 1925 | dev_err(ddev, "write caching control failed\n"); |
4b83e99e JA |
1926 | pkt_dump_sense(pd, &cgc); |
1927 | } else if (!ret && set) | |
3a41db53 | 1928 | dev_notice(ddev, "enabled write caching\n"); |
4b83e99e JA |
1929 | return ret; |
1930 | } | |
1931 | ||
1932 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1933 | { | |
1934 | struct packet_command cgc; | |
1935 | ||
1936 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1937 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1938 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1939 | return pkt_generic_packet(pd, &cgc); | |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * Returns drive maximum write speed | |
1944 | */ | |
1945 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, | |
1946 | unsigned *write_speed) | |
1947 | { | |
1948 | struct packet_command cgc; | |
1949 | struct scsi_sense_hdr sshdr; | |
1950 | unsigned char buf[256+18]; | |
1951 | unsigned char *cap_buf; | |
1952 | int ret, offset; | |
1953 | ||
1954 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1955 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
1956 | cgc.sshdr = &sshdr; | |
1957 | ||
1958 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1959 | if (ret) { | |
1960 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
1961 | sizeof(struct mode_page_header); | |
1962 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1963 | if (ret) { | |
1964 | pkt_dump_sense(pd, &cgc); | |
1965 | return ret; | |
1966 | } | |
1967 | } | |
1968 | ||
1969 | offset = 20; /* Obsoleted field, used by older drives */ | |
1970 | if (cap_buf[1] >= 28) | |
1971 | offset = 28; /* Current write speed selected */ | |
1972 | if (cap_buf[1] >= 30) { | |
1973 | /* If the drive reports at least one "Logical Unit Write | |
1974 | * Speed Performance Descriptor Block", use the information | |
1975 | * in the first block. (contains the highest speed) | |
1976 | */ | |
046636a4 | 1977 | int num_spdb = get_unaligned_be16(&cap_buf[30]); |
4b83e99e JA |
1978 | if (num_spdb > 0) |
1979 | offset = 34; | |
1980 | } | |
1981 | ||
046636a4 | 1982 | *write_speed = get_unaligned_be16(&cap_buf[offset]); |
4b83e99e JA |
1983 | return 0; |
1984 | } | |
1985 | ||
1986 | /* These tables from cdrecord - I don't have orange book */ | |
1987 | /* standard speed CD-RW (1-4x) */ | |
1988 | static char clv_to_speed[16] = { | |
1989 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1990 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1991 | }; | |
1992 | /* high speed CD-RW (-10x) */ | |
1993 | static char hs_clv_to_speed[16] = { | |
1994 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
1995 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1996 | }; | |
1997 | /* ultra high speed CD-RW */ | |
1998 | static char us_clv_to_speed[16] = { | |
1999 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2000 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2001 | }; | |
2002 | ||
2003 | /* | |
2004 | * reads the maximum media speed from ATIP | |
2005 | */ | |
2006 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, | |
2007 | unsigned *speed) | |
2008 | { | |
3a41db53 | 2009 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
2010 | struct packet_command cgc; |
2011 | struct scsi_sense_hdr sshdr; | |
2012 | unsigned char buf[64]; | |
2013 | unsigned int size, st, sp; | |
2014 | int ret; | |
2015 | ||
2016 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2017 | cgc.sshdr = &sshdr; | |
2018 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2019 | cgc.cmd[1] = 2; | |
2020 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2021 | cgc.cmd[8] = 2; | |
2022 | ret = pkt_generic_packet(pd, &cgc); | |
2023 | if (ret) { | |
2024 | pkt_dump_sense(pd, &cgc); | |
2025 | return ret; | |
2026 | } | |
046636a4 | 2027 | size = 2 + get_unaligned_be16(&buf[0]); |
4b83e99e JA |
2028 | if (size > sizeof(buf)) |
2029 | size = sizeof(buf); | |
2030 | ||
2031 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2032 | cgc.sshdr = &sshdr; | |
2033 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2034 | cgc.cmd[1] = 2; | |
2035 | cgc.cmd[2] = 4; | |
2036 | cgc.cmd[8] = size; | |
2037 | ret = pkt_generic_packet(pd, &cgc); | |
2038 | if (ret) { | |
2039 | pkt_dump_sense(pd, &cgc); | |
2040 | return ret; | |
2041 | } | |
2042 | ||
2043 | if (!(buf[6] & 0x40)) { | |
3a41db53 | 2044 | dev_notice(ddev, "disc type is not CD-RW\n"); |
4b83e99e JA |
2045 | return 1; |
2046 | } | |
2047 | if (!(buf[6] & 0x4)) { | |
3a41db53 | 2048 | dev_notice(ddev, "A1 values on media are not valid, maybe not CDRW?\n"); |
4b83e99e JA |
2049 | return 1; |
2050 | } | |
2051 | ||
2052 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2053 | ||
2054 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2055 | ||
2056 | /* Info from cdrecord */ | |
2057 | switch (st) { | |
2058 | case 0: /* standard speed */ | |
2059 | *speed = clv_to_speed[sp]; | |
2060 | break; | |
2061 | case 1: /* high speed */ | |
2062 | *speed = hs_clv_to_speed[sp]; | |
2063 | break; | |
2064 | case 2: /* ultra high speed */ | |
2065 | *speed = us_clv_to_speed[sp]; | |
2066 | break; | |
2067 | default: | |
3a41db53 | 2068 | dev_notice(ddev, "unknown disc sub-type %d\n", st); |
4b83e99e JA |
2069 | return 1; |
2070 | } | |
2071 | if (*speed) { | |
3a41db53 | 2072 | dev_info(ddev, "maximum media speed: %d\n", *speed); |
4b83e99e JA |
2073 | return 0; |
2074 | } else { | |
3a41db53 | 2075 | dev_notice(ddev, "unknown speed %d for sub-type %d\n", sp, st); |
4b83e99e JA |
2076 | return 1; |
2077 | } | |
2078 | } | |
2079 | ||
2080 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) | |
2081 | { | |
3a41db53 | 2082 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
2083 | struct packet_command cgc; |
2084 | struct scsi_sense_hdr sshdr; | |
2085 | int ret; | |
2086 | ||
3a41db53 | 2087 | dev_dbg(ddev, "Performing OPC\n"); |
4b83e99e JA |
2088 | |
2089 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2090 | cgc.sshdr = &sshdr; | |
2091 | cgc.timeout = 60*HZ; | |
2092 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2093 | cgc.cmd[1] = 1; | |
2094 | ret = pkt_generic_packet(pd, &cgc); | |
2095 | if (ret) | |
2096 | pkt_dump_sense(pd, &cgc); | |
2097 | return ret; | |
2098 | } | |
2099 | ||
2100 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2101 | { | |
3a41db53 | 2102 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
2103 | int ret; |
2104 | unsigned int write_speed, media_write_speed, read_speed; | |
2105 | ||
2106 | ret = pkt_probe_settings(pd); | |
2107 | if (ret) { | |
3a41db53 | 2108 | dev_dbg(ddev, "failed probe\n"); |
4b83e99e JA |
2109 | return ret; |
2110 | } | |
2111 | ||
2112 | ret = pkt_set_write_settings(pd); | |
2113 | if (ret) { | |
3a41db53 | 2114 | dev_notice(ddev, "failed saving write settings\n"); |
4b83e99e JA |
2115 | return -EIO; |
2116 | } | |
2117 | ||
f5bdc61e | 2118 | pkt_write_caching(pd); |
4b83e99e JA |
2119 | |
2120 | ret = pkt_get_max_speed(pd, &write_speed); | |
2121 | if (ret) | |
2122 | write_speed = 16 * 177; | |
2123 | switch (pd->mmc3_profile) { | |
2124 | case 0x13: /* DVD-RW */ | |
2125 | case 0x1a: /* DVD+RW */ | |
2126 | case 0x12: /* DVD-RAM */ | |
3a41db53 | 2127 | dev_notice(ddev, "write speed %ukB/s\n", write_speed); |
4b83e99e JA |
2128 | break; |
2129 | default: | |
2130 | ret = pkt_media_speed(pd, &media_write_speed); | |
2131 | if (ret) | |
2132 | media_write_speed = 16; | |
2133 | write_speed = min(write_speed, media_write_speed * 177); | |
3a41db53 | 2134 | dev_notice(ddev, "write speed %ux\n", write_speed / 176); |
4b83e99e JA |
2135 | break; |
2136 | } | |
2137 | read_speed = write_speed; | |
2138 | ||
2139 | ret = pkt_set_speed(pd, write_speed, read_speed); | |
2140 | if (ret) { | |
3a41db53 | 2141 | dev_notice(ddev, "couldn't set write speed\n"); |
4b83e99e JA |
2142 | return -EIO; |
2143 | } | |
2144 | pd->write_speed = write_speed; | |
2145 | pd->read_speed = read_speed; | |
2146 | ||
2147 | ret = pkt_perform_opc(pd); | |
3a41db53 AS |
2148 | if (ret) |
2149 | dev_notice(ddev, "Optimum Power Calibration failed\n"); | |
4b83e99e JA |
2150 | |
2151 | return 0; | |
2152 | } | |
2153 | ||
2154 | /* | |
2155 | * called at open time. | |
2156 | */ | |
05bdb996 | 2157 | static int pkt_open_dev(struct pktcdvd_device *pd, bool write) |
4b83e99e | 2158 | { |
3a41db53 | 2159 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
2160 | int ret; |
2161 | long lba; | |
2162 | struct request_queue *q; | |
2163 | struct block_device *bdev; | |
2164 | ||
2165 | /* | |
2166 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2167 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2168 | * so open should not fail. | |
2169 | */ | |
05bdb996 | 2170 | bdev = blkdev_get_by_dev(pd->bdev->bd_dev, BLK_OPEN_READ, pd, NULL); |
4b83e99e JA |
2171 | if (IS_ERR(bdev)) { |
2172 | ret = PTR_ERR(bdev); | |
2173 | goto out; | |
2174 | } | |
2175 | ||
2176 | ret = pkt_get_last_written(pd, &lba); | |
2177 | if (ret) { | |
3a41db53 | 2178 | dev_err(ddev, "pkt_get_last_written failed\n"); |
4b83e99e JA |
2179 | goto out_putdev; |
2180 | } | |
2181 | ||
2182 | set_capacity(pd->disk, lba << 2); | |
2183 | set_capacity_and_notify(pd->bdev->bd_disk, lba << 2); | |
2184 | ||
2185 | q = bdev_get_queue(pd->bdev); | |
2186 | if (write) { | |
2187 | ret = pkt_open_write(pd); | |
2188 | if (ret) | |
2189 | goto out_putdev; | |
2190 | /* | |
2191 | * Some CDRW drives can not handle writes larger than one packet, | |
2192 | * even if the size is a multiple of the packet size. | |
2193 | */ | |
2194 | blk_queue_max_hw_sectors(q, pd->settings.size); | |
2195 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2196 | } else { | |
2197 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2198 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2199 | } | |
2200 | ||
2201 | ret = pkt_set_segment_merging(pd, q); | |
2202 | if (ret) | |
2203 | goto out_putdev; | |
2204 | ||
2205 | if (write) { | |
2206 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
3a41db53 | 2207 | dev_err(ddev, "not enough memory for buffers\n"); |
4b83e99e JA |
2208 | ret = -ENOMEM; |
2209 | goto out_putdev; | |
2210 | } | |
3a41db53 | 2211 | dev_info(ddev, "%lukB available on disc\n", lba << 1); |
4b83e99e JA |
2212 | } |
2213 | ||
2214 | return 0; | |
2215 | ||
2216 | out_putdev: | |
2736e8ee | 2217 | blkdev_put(bdev, pd); |
4b83e99e JA |
2218 | out: |
2219 | return ret; | |
2220 | } | |
2221 | ||
2222 | /* | |
2223 | * called when the device is closed. makes sure that the device flushes | |
2224 | * the internal cache before we close. | |
2225 | */ | |
2226 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2227 | { | |
3a41db53 AS |
2228 | struct device *ddev = disk_to_dev(pd->disk); |
2229 | ||
4b83e99e | 2230 | if (flush && pkt_flush_cache(pd)) |
3a41db53 | 2231 | dev_notice(ddev, "not flushing cache\n"); |
4b83e99e JA |
2232 | |
2233 | pkt_lock_door(pd, 0); | |
2234 | ||
2235 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2736e8ee | 2236 | blkdev_put(pd->bdev, pd); |
4b83e99e JA |
2237 | |
2238 | pkt_shrink_pktlist(pd); | |
2239 | } | |
2240 | ||
2241 | static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor) | |
2242 | { | |
2243 | if (dev_minor >= MAX_WRITERS) | |
2244 | return NULL; | |
2245 | ||
2246 | dev_minor = array_index_nospec(dev_minor, MAX_WRITERS); | |
2247 | return pkt_devs[dev_minor]; | |
2248 | } | |
2249 | ||
05bdb996 | 2250 | static int pkt_open(struct gendisk *disk, blk_mode_t mode) |
4b83e99e JA |
2251 | { |
2252 | struct pktcdvd_device *pd = NULL; | |
2253 | int ret; | |
2254 | ||
2255 | mutex_lock(&pktcdvd_mutex); | |
2256 | mutex_lock(&ctl_mutex); | |
d32e2bf8 | 2257 | pd = pkt_find_dev_from_minor(disk->first_minor); |
4b83e99e JA |
2258 | if (!pd) { |
2259 | ret = -ENODEV; | |
2260 | goto out; | |
2261 | } | |
2262 | BUG_ON(pd->refcnt < 0); | |
2263 | ||
2264 | pd->refcnt++; | |
2265 | if (pd->refcnt > 1) { | |
05bdb996 | 2266 | if ((mode & BLK_OPEN_WRITE) && |
4b83e99e JA |
2267 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2268 | ret = -EBUSY; | |
2269 | goto out_dec; | |
2270 | } | |
2271 | } else { | |
05bdb996 | 2272 | ret = pkt_open_dev(pd, mode & BLK_OPEN_WRITE); |
4b83e99e JA |
2273 | if (ret) |
2274 | goto out_dec; | |
2275 | /* | |
2276 | * needed here as well, since ext2 (among others) may change | |
2277 | * the blocksize at mount time | |
2278 | */ | |
d32e2bf8 | 2279 | set_blocksize(disk->part0, CD_FRAMESIZE); |
4b83e99e | 2280 | } |
4b83e99e JA |
2281 | mutex_unlock(&ctl_mutex); |
2282 | mutex_unlock(&pktcdvd_mutex); | |
2283 | return 0; | |
2284 | ||
2285 | out_dec: | |
2286 | pd->refcnt--; | |
2287 | out: | |
2288 | mutex_unlock(&ctl_mutex); | |
2289 | mutex_unlock(&pktcdvd_mutex); | |
2290 | return ret; | |
2291 | } | |
2292 | ||
ae220766 | 2293 | static void pkt_release(struct gendisk *disk) |
4b83e99e JA |
2294 | { |
2295 | struct pktcdvd_device *pd = disk->private_data; | |
2296 | ||
2297 | mutex_lock(&pktcdvd_mutex); | |
2298 | mutex_lock(&ctl_mutex); | |
2299 | pd->refcnt--; | |
2300 | BUG_ON(pd->refcnt < 0); | |
2301 | if (pd->refcnt == 0) { | |
2302 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2303 | pkt_release_dev(pd, flush); | |
2304 | } | |
2305 | mutex_unlock(&ctl_mutex); | |
2306 | mutex_unlock(&pktcdvd_mutex); | |
2307 | } | |
2308 | ||
2309 | ||
2310 | static void pkt_end_io_read_cloned(struct bio *bio) | |
2311 | { | |
2312 | struct packet_stacked_data *psd = bio->bi_private; | |
2313 | struct pktcdvd_device *pd = psd->pd; | |
2314 | ||
2315 | psd->bio->bi_status = bio->bi_status; | |
2316 | bio_put(bio); | |
2317 | bio_endio(psd->bio); | |
2318 | mempool_free(psd, &psd_pool); | |
2319 | pkt_bio_finished(pd); | |
2320 | } | |
2321 | ||
2322 | static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio) | |
2323 | { | |
2324 | struct bio *cloned_bio = | |
2325 | bio_alloc_clone(pd->bdev, bio, GFP_NOIO, &pkt_bio_set); | |
2326 | struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO); | |
2327 | ||
2328 | psd->pd = pd; | |
2329 | psd->bio = bio; | |
2330 | cloned_bio->bi_private = psd; | |
2331 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2332 | pd->stats.secs_r += bio_sectors(bio); | |
2333 | pkt_queue_bio(pd, cloned_bio); | |
2334 | } | |
2335 | ||
2336 | static void pkt_make_request_write(struct request_queue *q, struct bio *bio) | |
2337 | { | |
2338 | struct pktcdvd_device *pd = q->queuedata; | |
2339 | sector_t zone; | |
2340 | struct packet_data *pkt; | |
2341 | int was_empty, blocked_bio; | |
2342 | struct pkt_rb_node *node; | |
2343 | ||
2344 | zone = get_zone(bio->bi_iter.bi_sector, pd); | |
2345 | ||
2346 | /* | |
2347 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2348 | * just append this bio to that packet. | |
2349 | */ | |
2350 | spin_lock(&pd->cdrw.active_list_lock); | |
2351 | blocked_bio = 0; | |
2352 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2353 | if (pkt->sector == zone) { | |
2354 | spin_lock(&pkt->lock); | |
2355 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2356 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
2357 | bio_list_add(&pkt->orig_bios, bio); | |
2358 | pkt->write_size += | |
2359 | bio->bi_iter.bi_size / CD_FRAMESIZE; | |
2360 | if ((pkt->write_size >= pkt->frames) && | |
2361 | (pkt->state == PACKET_WAITING_STATE)) { | |
2362 | atomic_inc(&pkt->run_sm); | |
2363 | wake_up(&pd->wqueue); | |
2364 | } | |
2365 | spin_unlock(&pkt->lock); | |
2366 | spin_unlock(&pd->cdrw.active_list_lock); | |
2367 | return; | |
2368 | } else { | |
2369 | blocked_bio = 1; | |
2370 | } | |
2371 | spin_unlock(&pkt->lock); | |
2372 | } | |
2373 | } | |
2374 | spin_unlock(&pd->cdrw.active_list_lock); | |
2375 | ||
2376 | /* | |
2377 | * Test if there is enough room left in the bio work queue | |
2378 | * (queue size >= congestion on mark). | |
2379 | * If not, wait till the work queue size is below the congestion off mark. | |
2380 | */ | |
2381 | spin_lock(&pd->lock); | |
2382 | if (pd->write_congestion_on > 0 | |
2383 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
2384 | struct wait_bit_queue_entry wqe; | |
2385 | ||
2386 | init_wait_var_entry(&wqe, &pd->congested, 0); | |
2387 | for (;;) { | |
2388 | prepare_to_wait_event(__var_waitqueue(&pd->congested), | |
2389 | &wqe.wq_entry, | |
2390 | TASK_UNINTERRUPTIBLE); | |
2391 | if (pd->bio_queue_size <= pd->write_congestion_off) | |
2392 | break; | |
2393 | pd->congested = true; | |
2394 | spin_unlock(&pd->lock); | |
2395 | schedule(); | |
2396 | spin_lock(&pd->lock); | |
2397 | } | |
2398 | } | |
2399 | spin_unlock(&pd->lock); | |
2400 | ||
2401 | /* | |
2402 | * No matching packet found. Store the bio in the work queue. | |
2403 | */ | |
2404 | node = mempool_alloc(&pd->rb_pool, GFP_NOIO); | |
2405 | node->bio = bio; | |
2406 | spin_lock(&pd->lock); | |
2407 | BUG_ON(pd->bio_queue_size < 0); | |
2408 | was_empty = (pd->bio_queue_size == 0); | |
2409 | pkt_rbtree_insert(pd, node); | |
2410 | spin_unlock(&pd->lock); | |
2411 | ||
2412 | /* | |
2413 | * Wake up the worker thread. | |
2414 | */ | |
2415 | atomic_set(&pd->scan_queue, 1); | |
2416 | if (was_empty) { | |
2417 | /* This wake_up is required for correct operation */ | |
2418 | wake_up(&pd->wqueue); | |
2419 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2420 | /* | |
2421 | * This wake up is not required for correct operation, | |
2422 | * but improves performance in some cases. | |
2423 | */ | |
2424 | wake_up(&pd->wqueue); | |
2425 | } | |
2426 | } | |
2427 | ||
2428 | static void pkt_submit_bio(struct bio *bio) | |
2429 | { | |
2430 | struct pktcdvd_device *pd = bio->bi_bdev->bd_disk->queue->queuedata; | |
3a41db53 | 2431 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
2432 | struct bio *split; |
2433 | ||
2434 | bio = bio_split_to_limits(bio); | |
3e9900f3 JA |
2435 | if (!bio) |
2436 | return; | |
4b83e99e | 2437 | |
3a41db53 | 2438 | dev_dbg(ddev, "start = %6llx stop = %6llx\n", |
93c8f6f3 | 2439 | bio->bi_iter.bi_sector, bio_end_sector(bio)); |
4b83e99e JA |
2440 | |
2441 | /* | |
2442 | * Clone READ bios so we can have our own bi_end_io callback. | |
2443 | */ | |
2444 | if (bio_data_dir(bio) == READ) { | |
2445 | pkt_make_request_read(pd, bio); | |
2446 | return; | |
2447 | } | |
2448 | ||
2449 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
93c8f6f3 | 2450 | dev_notice(ddev, "WRITE for ro device (%llu)\n", bio->bi_iter.bi_sector); |
4b83e99e JA |
2451 | goto end_io; |
2452 | } | |
2453 | ||
2454 | if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) { | |
3a41db53 | 2455 | dev_err(ddev, "wrong bio size\n"); |
4b83e99e JA |
2456 | goto end_io; |
2457 | } | |
2458 | ||
2459 | do { | |
2460 | sector_t zone = get_zone(bio->bi_iter.bi_sector, pd); | |
2461 | sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd); | |
2462 | ||
2463 | if (last_zone != zone) { | |
2464 | BUG_ON(last_zone != zone + pd->settings.size); | |
2465 | ||
2466 | split = bio_split(bio, last_zone - | |
2467 | bio->bi_iter.bi_sector, | |
2468 | GFP_NOIO, &pkt_bio_set); | |
2469 | bio_chain(split, bio); | |
2470 | } else { | |
2471 | split = bio; | |
2472 | } | |
2473 | ||
2474 | pkt_make_request_write(bio->bi_bdev->bd_disk->queue, split); | |
2475 | } while (split != bio); | |
2476 | ||
2477 | return; | |
2478 | end_io: | |
2479 | bio_io_error(bio); | |
2480 | } | |
2481 | ||
2482 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2483 | { | |
2484 | struct request_queue *q = pd->disk->queue; | |
2485 | ||
2486 | blk_queue_logical_block_size(q, CD_FRAMESIZE); | |
2487 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); | |
2488 | q->queuedata = pd; | |
2489 | } | |
2490 | ||
4b83e99e JA |
2491 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) |
2492 | { | |
3a41db53 | 2493 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
2494 | int i; |
2495 | struct block_device *bdev; | |
2496 | struct scsi_device *sdev; | |
2497 | ||
2498 | if (pd->pkt_dev == dev) { | |
3a41db53 | 2499 | dev_err(ddev, "recursive setup not allowed\n"); |
4b83e99e JA |
2500 | return -EBUSY; |
2501 | } | |
2502 | for (i = 0; i < MAX_WRITERS; i++) { | |
2503 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2504 | if (!pd2) | |
2505 | continue; | |
2506 | if (pd2->bdev->bd_dev == dev) { | |
3a41db53 | 2507 | dev_err(ddev, "%pg already setup\n", pd2->bdev); |
4b83e99e JA |
2508 | return -EBUSY; |
2509 | } | |
2510 | if (pd2->pkt_dev == dev) { | |
3a41db53 | 2511 | dev_err(ddev, "can't chain pktcdvd devices\n"); |
4b83e99e JA |
2512 | return -EBUSY; |
2513 | } | |
2514 | } | |
2515 | ||
05bdb996 CH |
2516 | bdev = blkdev_get_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_NDELAY, NULL, |
2517 | NULL); | |
4b83e99e JA |
2518 | if (IS_ERR(bdev)) |
2519 | return PTR_ERR(bdev); | |
2520 | sdev = scsi_device_from_queue(bdev->bd_disk->queue); | |
2521 | if (!sdev) { | |
2736e8ee | 2522 | blkdev_put(bdev, NULL); |
4b83e99e JA |
2523 | return -EINVAL; |
2524 | } | |
2525 | put_device(&sdev->sdev_gendev); | |
2526 | ||
2527 | /* This is safe, since we have a reference from open(). */ | |
2528 | __module_get(THIS_MODULE); | |
2529 | ||
2530 | pd->bdev = bdev; | |
2531 | set_blocksize(bdev, CD_FRAMESIZE); | |
2532 | ||
2533 | pkt_init_queue(pd); | |
2534 | ||
2535 | atomic_set(&pd->cdrw.pending_bios, 0); | |
3a41db53 | 2536 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->disk->disk_name); |
4b83e99e | 2537 | if (IS_ERR(pd->cdrw.thread)) { |
3a41db53 | 2538 | dev_err(ddev, "can't start kernel thread\n"); |
4b83e99e JA |
2539 | goto out_mem; |
2540 | } | |
2541 | ||
3a41db53 AS |
2542 | proc_create_single_data(pd->disk->disk_name, 0, pkt_proc, pkt_seq_show, pd); |
2543 | dev_notice(ddev, "writer mapped to %pg\n", bdev); | |
4b83e99e JA |
2544 | return 0; |
2545 | ||
2546 | out_mem: | |
2736e8ee | 2547 | blkdev_put(bdev, NULL); |
4b83e99e JA |
2548 | /* This is safe: open() is still holding a reference. */ |
2549 | module_put(THIS_MODULE); | |
2550 | return -ENOMEM; | |
2551 | } | |
2552 | ||
05bdb996 CH |
2553 | static int pkt_ioctl(struct block_device *bdev, blk_mode_t mode, |
2554 | unsigned int cmd, unsigned long arg) | |
4b83e99e JA |
2555 | { |
2556 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; | |
3a41db53 | 2557 | struct device *ddev = disk_to_dev(pd->disk); |
4b83e99e JA |
2558 | int ret; |
2559 | ||
3a41db53 | 2560 | dev_dbg(ddev, "cmd %x, dev %d:%d\n", cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); |
4b83e99e JA |
2561 | |
2562 | mutex_lock(&pktcdvd_mutex); | |
2563 | switch (cmd) { | |
2564 | case CDROMEJECT: | |
2565 | /* | |
2566 | * The door gets locked when the device is opened, so we | |
2567 | * have to unlock it or else the eject command fails. | |
2568 | */ | |
2569 | if (pd->refcnt == 1) | |
2570 | pkt_lock_door(pd, 0); | |
2571 | fallthrough; | |
2572 | /* | |
2573 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2574 | */ | |
2575 | case CDROMMULTISESSION: | |
2576 | case CDROMREADTOCENTRY: | |
2577 | case CDROM_LAST_WRITTEN: | |
2578 | case CDROM_SEND_PACKET: | |
2579 | case SCSI_IOCTL_SEND_COMMAND: | |
2580 | if (!bdev->bd_disk->fops->ioctl) | |
2581 | ret = -ENOTTY; | |
2582 | else | |
2583 | ret = bdev->bd_disk->fops->ioctl(bdev, mode, cmd, arg); | |
2584 | break; | |
2585 | default: | |
3a41db53 | 2586 | dev_dbg(ddev, "Unknown ioctl (%x)\n", cmd); |
4b83e99e JA |
2587 | ret = -ENOTTY; |
2588 | } | |
2589 | mutex_unlock(&pktcdvd_mutex); | |
2590 | ||
2591 | return ret; | |
2592 | } | |
2593 | ||
2594 | static unsigned int pkt_check_events(struct gendisk *disk, | |
2595 | unsigned int clearing) | |
2596 | { | |
2597 | struct pktcdvd_device *pd = disk->private_data; | |
2598 | struct gendisk *attached_disk; | |
2599 | ||
2600 | if (!pd) | |
2601 | return 0; | |
2602 | if (!pd->bdev) | |
2603 | return 0; | |
2604 | attached_disk = pd->bdev->bd_disk; | |
2605 | if (!attached_disk || !attached_disk->fops->check_events) | |
2606 | return 0; | |
2607 | return attached_disk->fops->check_events(attached_disk, clearing); | |
2608 | } | |
2609 | ||
2610 | static char *pkt_devnode(struct gendisk *disk, umode_t *mode) | |
2611 | { | |
2612 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", disk->disk_name); | |
2613 | } | |
2614 | ||
2615 | static const struct block_device_operations pktcdvd_ops = { | |
2616 | .owner = THIS_MODULE, | |
2617 | .submit_bio = pkt_submit_bio, | |
2618 | .open = pkt_open, | |
ae220766 | 2619 | .release = pkt_release, |
4b83e99e JA |
2620 | .ioctl = pkt_ioctl, |
2621 | .compat_ioctl = blkdev_compat_ptr_ioctl, | |
2622 | .check_events = pkt_check_events, | |
2623 | .devnode = pkt_devnode, | |
2624 | }; | |
2625 | ||
2626 | /* | |
2627 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2628 | */ | |
2629 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) | |
2630 | { | |
2631 | int idx; | |
2632 | int ret = -ENOMEM; | |
2633 | struct pktcdvd_device *pd; | |
2634 | struct gendisk *disk; | |
2635 | ||
2636 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2637 | ||
2638 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2639 | if (!pkt_devs[idx]) | |
2640 | break; | |
2641 | if (idx == MAX_WRITERS) { | |
2642 | pr_err("max %d writers supported\n", MAX_WRITERS); | |
2643 | ret = -EBUSY; | |
2644 | goto out_mutex; | |
2645 | } | |
2646 | ||
2647 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); | |
2648 | if (!pd) | |
2649 | goto out_mutex; | |
2650 | ||
2651 | ret = mempool_init_kmalloc_pool(&pd->rb_pool, PKT_RB_POOL_SIZE, | |
2652 | sizeof(struct pkt_rb_node)); | |
2653 | if (ret) | |
2654 | goto out_mem; | |
2655 | ||
2656 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); | |
2657 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2658 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2659 | ||
2660 | spin_lock_init(&pd->lock); | |
2661 | spin_lock_init(&pd->iosched.lock); | |
2662 | bio_list_init(&pd->iosched.read_queue); | |
2663 | bio_list_init(&pd->iosched.write_queue); | |
4b83e99e JA |
2664 | init_waitqueue_head(&pd->wqueue); |
2665 | pd->bio_queue = RB_ROOT; | |
2666 | ||
2667 | pd->write_congestion_on = write_congestion_on; | |
2668 | pd->write_congestion_off = write_congestion_off; | |
2669 | ||
2670 | ret = -ENOMEM; | |
2671 | disk = blk_alloc_disk(NUMA_NO_NODE); | |
2672 | if (!disk) | |
2673 | goto out_mem; | |
2674 | pd->disk = disk; | |
2675 | disk->major = pktdev_major; | |
2676 | disk->first_minor = idx; | |
2677 | disk->minors = 1; | |
2678 | disk->fops = &pktcdvd_ops; | |
2679 | disk->flags = GENHD_FL_REMOVABLE | GENHD_FL_NO_PART; | |
3a41db53 | 2680 | snprintf(disk->disk_name, sizeof(disk->disk_name), DRIVER_NAME"%d", idx); |
4b83e99e JA |
2681 | disk->private_data = pd; |
2682 | ||
2683 | pd->pkt_dev = MKDEV(pktdev_major, idx); | |
2684 | ret = pkt_new_dev(pd, dev); | |
2685 | if (ret) | |
2686 | goto out_mem2; | |
2687 | ||
2688 | /* inherit events of the host device */ | |
2689 | disk->events = pd->bdev->bd_disk->events; | |
2690 | ||
2691 | ret = add_disk(disk); | |
2692 | if (ret) | |
2693 | goto out_mem2; | |
2694 | ||
2695 | pkt_sysfs_dev_new(pd); | |
2696 | pkt_debugfs_dev_new(pd); | |
2697 | ||
2698 | pkt_devs[idx] = pd; | |
2699 | if (pkt_dev) | |
2700 | *pkt_dev = pd->pkt_dev; | |
2701 | ||
2702 | mutex_unlock(&ctl_mutex); | |
2703 | return 0; | |
2704 | ||
2705 | out_mem2: | |
2706 | put_disk(disk); | |
2707 | out_mem: | |
2708 | mempool_exit(&pd->rb_pool); | |
2709 | kfree(pd); | |
2710 | out_mutex: | |
2711 | mutex_unlock(&ctl_mutex); | |
2712 | pr_err("setup of pktcdvd device failed\n"); | |
2713 | return ret; | |
2714 | } | |
2715 | ||
2716 | /* | |
2717 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2718 | */ | |
2719 | static int pkt_remove_dev(dev_t pkt_dev) | |
2720 | { | |
2721 | struct pktcdvd_device *pd; | |
3a41db53 | 2722 | struct device *ddev; |
4b83e99e JA |
2723 | int idx; |
2724 | int ret = 0; | |
2725 | ||
2726 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2727 | ||
2728 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2729 | pd = pkt_devs[idx]; | |
2730 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2731 | break; | |
2732 | } | |
2733 | if (idx == MAX_WRITERS) { | |
2734 | pr_debug("dev not setup\n"); | |
2735 | ret = -ENXIO; | |
2736 | goto out; | |
2737 | } | |
2738 | ||
2739 | if (pd->refcnt > 0) { | |
2740 | ret = -EBUSY; | |
2741 | goto out; | |
2742 | } | |
3a41db53 AS |
2743 | |
2744 | ddev = disk_to_dev(pd->disk); | |
2745 | ||
4b83e99e JA |
2746 | if (!IS_ERR(pd->cdrw.thread)) |
2747 | kthread_stop(pd->cdrw.thread); | |
2748 | ||
2749 | pkt_devs[idx] = NULL; | |
2750 | ||
2751 | pkt_debugfs_dev_remove(pd); | |
2752 | pkt_sysfs_dev_remove(pd); | |
2753 | ||
2736e8ee | 2754 | blkdev_put(pd->bdev, NULL); |
4b83e99e | 2755 | |
3a41db53 AS |
2756 | remove_proc_entry(pd->disk->disk_name, pkt_proc); |
2757 | dev_notice(ddev, "writer unmapped\n"); | |
4b83e99e JA |
2758 | |
2759 | del_gendisk(pd->disk); | |
2760 | put_disk(pd->disk); | |
2761 | ||
2762 | mempool_exit(&pd->rb_pool); | |
2763 | kfree(pd); | |
2764 | ||
2765 | /* This is safe: open() is still holding a reference. */ | |
2766 | module_put(THIS_MODULE); | |
2767 | ||
2768 | out: | |
2769 | mutex_unlock(&ctl_mutex); | |
2770 | return ret; | |
2771 | } | |
2772 | ||
2773 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2774 | { | |
2775 | struct pktcdvd_device *pd; | |
2776 | ||
2777 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2778 | ||
2779 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
2780 | if (pd) { | |
2781 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2782 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2783 | } else { | |
2784 | ctrl_cmd->dev = 0; | |
2785 | ctrl_cmd->pkt_dev = 0; | |
2786 | } | |
2787 | ctrl_cmd->num_devices = MAX_WRITERS; | |
2788 | ||
2789 | mutex_unlock(&ctl_mutex); | |
2790 | } | |
2791 | ||
2792 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2793 | { | |
2794 | void __user *argp = (void __user *)arg; | |
2795 | struct pkt_ctrl_command ctrl_cmd; | |
2796 | int ret = 0; | |
2797 | dev_t pkt_dev = 0; | |
2798 | ||
2799 | if (cmd != PACKET_CTRL_CMD) | |
2800 | return -ENOTTY; | |
2801 | ||
2802 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2803 | return -EFAULT; | |
2804 | ||
2805 | switch (ctrl_cmd.command) { | |
2806 | case PKT_CTRL_CMD_SETUP: | |
2807 | if (!capable(CAP_SYS_ADMIN)) | |
2808 | return -EPERM; | |
2809 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); | |
2810 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
2811 | break; | |
2812 | case PKT_CTRL_CMD_TEARDOWN: | |
2813 | if (!capable(CAP_SYS_ADMIN)) | |
2814 | return -EPERM; | |
2815 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); | |
2816 | break; | |
2817 | case PKT_CTRL_CMD_STATUS: | |
2818 | pkt_get_status(&ctrl_cmd); | |
2819 | break; | |
2820 | default: | |
2821 | return -ENOTTY; | |
2822 | } | |
2823 | ||
2824 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2825 | return -EFAULT; | |
2826 | return ret; | |
2827 | } | |
2828 | ||
2829 | #ifdef CONFIG_COMPAT | |
2830 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2831 | { | |
2832 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
2833 | } | |
2834 | #endif | |
2835 | ||
2836 | static const struct file_operations pkt_ctl_fops = { | |
2837 | .open = nonseekable_open, | |
2838 | .unlocked_ioctl = pkt_ctl_ioctl, | |
2839 | #ifdef CONFIG_COMPAT | |
2840 | .compat_ioctl = pkt_ctl_compat_ioctl, | |
2841 | #endif | |
2842 | .owner = THIS_MODULE, | |
2843 | .llseek = no_llseek, | |
2844 | }; | |
2845 | ||
2846 | static struct miscdevice pkt_misc = { | |
2847 | .minor = MISC_DYNAMIC_MINOR, | |
2848 | .name = DRIVER_NAME, | |
2849 | .nodename = "pktcdvd/control", | |
2850 | .fops = &pkt_ctl_fops | |
2851 | }; | |
2852 | ||
2853 | static int __init pkt_init(void) | |
2854 | { | |
2855 | int ret; | |
2856 | ||
2857 | mutex_init(&ctl_mutex); | |
2858 | ||
2859 | ret = mempool_init_kmalloc_pool(&psd_pool, PSD_POOL_SIZE, | |
2860 | sizeof(struct packet_stacked_data)); | |
2861 | if (ret) | |
2862 | return ret; | |
2863 | ret = bioset_init(&pkt_bio_set, BIO_POOL_SIZE, 0, 0); | |
2864 | if (ret) { | |
2865 | mempool_exit(&psd_pool); | |
2866 | return ret; | |
2867 | } | |
2868 | ||
2869 | ret = register_blkdev(pktdev_major, DRIVER_NAME); | |
2870 | if (ret < 0) { | |
2871 | pr_err("unable to register block device\n"); | |
2872 | goto out2; | |
2873 | } | |
2874 | if (!pktdev_major) | |
2875 | pktdev_major = ret; | |
2876 | ||
2877 | ret = pkt_sysfs_init(); | |
2878 | if (ret) | |
2879 | goto out; | |
2880 | ||
2881 | pkt_debugfs_init(); | |
2882 | ||
2883 | ret = misc_register(&pkt_misc); | |
2884 | if (ret) { | |
2885 | pr_err("unable to register misc device\n"); | |
2886 | goto out_misc; | |
2887 | } | |
2888 | ||
2889 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); | |
2890 | ||
2891 | return 0; | |
2892 | ||
2893 | out_misc: | |
2894 | pkt_debugfs_cleanup(); | |
2895 | pkt_sysfs_cleanup(); | |
2896 | out: | |
2897 | unregister_blkdev(pktdev_major, DRIVER_NAME); | |
2898 | out2: | |
2899 | mempool_exit(&psd_pool); | |
2900 | bioset_exit(&pkt_bio_set); | |
2901 | return ret; | |
2902 | } | |
2903 | ||
2904 | static void __exit pkt_exit(void) | |
2905 | { | |
2906 | remove_proc_entry("driver/"DRIVER_NAME, NULL); | |
2907 | misc_deregister(&pkt_misc); | |
2908 | ||
2909 | pkt_debugfs_cleanup(); | |
2910 | pkt_sysfs_cleanup(); | |
2911 | ||
2912 | unregister_blkdev(pktdev_major, DRIVER_NAME); | |
2913 | mempool_exit(&psd_pool); | |
2914 | bioset_exit(&pkt_bio_set); | |
2915 | } | |
2916 | ||
2917 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
2918 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
2919 | MODULE_LICENSE("GPL"); | |
2920 | ||
2921 | module_init(pkt_init); | |
2922 | module_exit(pkt_exit); |