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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
adb9250a | 4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
1da177e4 LT |
5 | * |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
a676f8d0 PO |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
10 | * DVD-RAM devices. | |
1da177e4 LT |
11 | * |
12 | * Theory of operation: | |
13 | * | |
a676f8d0 PO |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, |
15 | * typically ide-cd.c or 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 make_request_fn 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. | |
1da177e4 LT |
44 | * |
45 | *************************************************************************/ | |
46 | ||
99481334 JP |
47 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
48 | ||
1da177e4 | 49 | #include <linux/pktcdvd.h> |
1da177e4 LT |
50 | #include <linux/module.h> |
51 | #include <linux/types.h> | |
52 | #include <linux/kernel.h> | |
f80a0ca6 | 53 | #include <linux/compat.h> |
1da177e4 LT |
54 | #include <linux/kthread.h> |
55 | #include <linux/errno.h> | |
56 | #include <linux/spinlock.h> | |
57 | #include <linux/file.h> | |
58 | #include <linux/proc_fs.h> | |
59 | #include <linux/seq_file.h> | |
60 | #include <linux/miscdevice.h> | |
7dfb7103 | 61 | #include <linux/freezer.h> |
1657f824 | 62 | #include <linux/mutex.h> |
5a0e3ad6 | 63 | #include <linux/slab.h> |
66114cad | 64 | #include <linux/backing-dev.h> |
1da177e4 LT |
65 | #include <scsi/scsi_cmnd.h> |
66 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 67 | #include <scsi/scsi.h> |
32694850 TM |
68 | #include <linux/debugfs.h> |
69 | #include <linux/device.h> | |
1da177e4 | 70 | |
7c0f6ba6 | 71 | #include <linux/uaccess.h> |
1da177e4 | 72 | |
7822082d TM |
73 | #define DRIVER_NAME "pktcdvd" |
74 | ||
fa63c0ab JP |
75 | #define pkt_err(pd, fmt, ...) \ |
76 | pr_err("%s: " fmt, pd->name, ##__VA_ARGS__) | |
ca73dabc JP |
77 | #define pkt_notice(pd, fmt, ...) \ |
78 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__) | |
0c075d64 JP |
79 | #define pkt_info(pd, fmt, ...) \ |
80 | pr_info("%s: " fmt, pd->name, ##__VA_ARGS__) | |
fa63c0ab | 81 | |
844aa797 JP |
82 | #define pkt_dbg(level, pd, fmt, ...) \ |
83 | do { \ | |
84 | if (level == 2 && PACKET_DEBUG >= 2) \ | |
85 | pr_notice("%s: %s():" fmt, \ | |
86 | pd->name, __func__, ##__VA_ARGS__); \ | |
87 | else if (level == 1 && PACKET_DEBUG >= 1) \ | |
88 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \ | |
cd3f2cd0 | 89 | } while (0) |
1da177e4 LT |
90 | |
91 | #define MAX_SPEED 0xffff | |
92 | ||
2a48fc0a | 93 | static DEFINE_MUTEX(pktcdvd_mutex); |
1da177e4 LT |
94 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
95 | static struct proc_dir_entry *pkt_proc; | |
add21660 | 96 | static int pktdev_major; |
0a0fc960 TM |
97 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
98 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 99 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
1da177e4 LT |
100 | static mempool_t *psd_pool; |
101 | ||
32694850 | 102 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
ea5ffff5 | 103 | static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
32694850 TM |
104 | |
105 | /* forward declaration */ | |
106 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
107 | static int pkt_remove_dev(dev_t pkt_dev); | |
108 | static int pkt_seq_show(struct seq_file *m, void *p); | |
109 | ||
5323fb77 JP |
110 | static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd) |
111 | { | |
112 | return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1); | |
113 | } | |
32694850 TM |
114 | |
115 | /* | |
116 | * create and register a pktcdvd kernel object. | |
117 | */ | |
118 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
119 | const char* name, | |
120 | struct kobject* parent, | |
121 | struct kobj_type* ktype) | |
122 | { | |
123 | struct pktcdvd_kobj *p; | |
89c42606 GKH |
124 | int error; |
125 | ||
32694850 TM |
126 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
127 | if (!p) | |
128 | return NULL; | |
32694850 | 129 | p->pd = pd; |
89c42606 GKH |
130 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
131 | if (error) { | |
d17a18dd | 132 | kobject_put(&p->kobj); |
32694850 | 133 | return NULL; |
d17a18dd | 134 | } |
89c42606 | 135 | kobject_uevent(&p->kobj, KOBJ_ADD); |
32694850 TM |
136 | return p; |
137 | } | |
138 | /* | |
139 | * remove a pktcdvd kernel object. | |
140 | */ | |
141 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) | |
142 | { | |
143 | if (p) | |
c10997f6 | 144 | kobject_put(&p->kobj); |
32694850 TM |
145 | } |
146 | /* | |
147 | * default release function for pktcdvd kernel objects. | |
148 | */ | |
149 | static void pkt_kobj_release(struct kobject *kobj) | |
150 | { | |
151 | kfree(to_pktcdvdkobj(kobj)); | |
152 | } | |
153 | ||
154 | ||
155 | /********************************************************** | |
156 | * | |
157 | * sysfs interface for pktcdvd | |
158 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
159 | * | |
160 | **********************************************************/ | |
161 | ||
162 | #define DEF_ATTR(_obj,_name,_mode) \ | |
7b595756 | 163 | static struct attribute _obj = { .name = _name, .mode = _mode } |
32694850 TM |
164 | |
165 | /********************************************************** | |
166 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
167 | stat/reset | |
168 | stat/packets_started | |
169 | stat/packets_finished | |
170 | stat/kb_written | |
171 | stat/kb_read | |
172 | stat/kb_read_gather | |
173 | write_queue/size | |
174 | write_queue/congestion_off | |
175 | write_queue/congestion_on | |
176 | **********************************************************/ | |
177 | ||
178 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); | |
179 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); | |
180 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); | |
181 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); | |
182 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); | |
183 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); | |
184 | ||
185 | static struct attribute *kobj_pkt_attrs_stat[] = { | |
186 | &kobj_pkt_attr_st1, | |
187 | &kobj_pkt_attr_st2, | |
188 | &kobj_pkt_attr_st3, | |
189 | &kobj_pkt_attr_st4, | |
190 | &kobj_pkt_attr_st5, | |
191 | &kobj_pkt_attr_st6, | |
192 | NULL | |
193 | }; | |
194 | ||
195 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); | |
196 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); | |
197 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); | |
198 | ||
199 | static struct attribute *kobj_pkt_attrs_wqueue[] = { | |
200 | &kobj_pkt_attr_wq1, | |
201 | &kobj_pkt_attr_wq2, | |
202 | &kobj_pkt_attr_wq3, | |
203 | NULL | |
204 | }; | |
205 | ||
32694850 TM |
206 | static ssize_t kobj_pkt_show(struct kobject *kobj, |
207 | struct attribute *attr, char *data) | |
208 | { | |
209 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
210 | int n = 0; | |
211 | int v; | |
212 | if (strcmp(attr->name, "packets_started") == 0) { | |
213 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); | |
214 | ||
215 | } else if (strcmp(attr->name, "packets_finished") == 0) { | |
216 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); | |
217 | ||
218 | } else if (strcmp(attr->name, "kb_written") == 0) { | |
219 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); | |
220 | ||
221 | } else if (strcmp(attr->name, "kb_read") == 0) { | |
222 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); | |
223 | ||
224 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { | |
225 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); | |
226 | ||
227 | } else if (strcmp(attr->name, "size") == 0) { | |
228 | spin_lock(&pd->lock); | |
229 | v = pd->bio_queue_size; | |
230 | spin_unlock(&pd->lock); | |
231 | n = sprintf(data, "%d\n", v); | |
232 | ||
233 | } else if (strcmp(attr->name, "congestion_off") == 0) { | |
234 | spin_lock(&pd->lock); | |
235 | v = pd->write_congestion_off; | |
236 | spin_unlock(&pd->lock); | |
237 | n = sprintf(data, "%d\n", v); | |
238 | ||
239 | } else if (strcmp(attr->name, "congestion_on") == 0) { | |
240 | spin_lock(&pd->lock); | |
241 | v = pd->write_congestion_on; | |
242 | spin_unlock(&pd->lock); | |
243 | n = sprintf(data, "%d\n", v); | |
244 | } | |
245 | return n; | |
246 | } | |
247 | ||
248 | static void init_write_congestion_marks(int* lo, int* hi) | |
249 | { | |
250 | if (*hi > 0) { | |
251 | *hi = max(*hi, 500); | |
252 | *hi = min(*hi, 1000000); | |
253 | if (*lo <= 0) | |
254 | *lo = *hi - 100; | |
255 | else { | |
256 | *lo = min(*lo, *hi - 100); | |
257 | *lo = max(*lo, 100); | |
258 | } | |
259 | } else { | |
260 | *hi = -1; | |
261 | *lo = -1; | |
262 | } | |
263 | } | |
264 | ||
265 | static ssize_t kobj_pkt_store(struct kobject *kobj, | |
266 | struct attribute *attr, | |
267 | const char *data, size_t len) | |
268 | { | |
269 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
270 | int val; | |
32694850 | 271 | |
83f3aa3d | 272 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
32694850 TM |
273 | pd->stats.pkt_started = 0; |
274 | pd->stats.pkt_ended = 0; | |
275 | pd->stats.secs_w = 0; | |
276 | pd->stats.secs_rg = 0; | |
277 | pd->stats.secs_r = 0; | |
278 | ||
279 | } else if (strcmp(attr->name, "congestion_off") == 0 | |
83f3aa3d | 280 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
281 | spin_lock(&pd->lock); |
282 | pd->write_congestion_off = val; | |
283 | init_write_congestion_marks(&pd->write_congestion_off, | |
284 | &pd->write_congestion_on); | |
285 | spin_unlock(&pd->lock); | |
286 | ||
287 | } else if (strcmp(attr->name, "congestion_on") == 0 | |
83f3aa3d | 288 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
289 | spin_lock(&pd->lock); |
290 | pd->write_congestion_on = val; | |
291 | init_write_congestion_marks(&pd->write_congestion_off, | |
292 | &pd->write_congestion_on); | |
293 | spin_unlock(&pd->lock); | |
294 | } | |
295 | return len; | |
296 | } | |
297 | ||
52cf25d0 | 298 | static const struct sysfs_ops kobj_pkt_ops = { |
32694850 TM |
299 | .show = kobj_pkt_show, |
300 | .store = kobj_pkt_store | |
301 | }; | |
302 | static struct kobj_type kobj_pkt_type_stat = { | |
303 | .release = pkt_kobj_release, | |
304 | .sysfs_ops = &kobj_pkt_ops, | |
305 | .default_attrs = kobj_pkt_attrs_stat | |
306 | }; | |
307 | static struct kobj_type kobj_pkt_type_wqueue = { | |
308 | .release = pkt_kobj_release, | |
309 | .sysfs_ops = &kobj_pkt_ops, | |
310 | .default_attrs = kobj_pkt_attrs_wqueue | |
311 | }; | |
312 | ||
313 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) | |
314 | { | |
315 | if (class_pktcdvd) { | |
cba76717 | 316 | pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
1ff9f542 | 317 | "%s", pd->name); |
6013c12b TJ |
318 | if (IS_ERR(pd->dev)) |
319 | pd->dev = NULL; | |
32694850 | 320 | } |
6013c12b | 321 | if (pd->dev) { |
32694850 | 322 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
6013c12b | 323 | &pd->dev->kobj, |
32694850 TM |
324 | &kobj_pkt_type_stat); |
325 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
6013c12b | 326 | &pd->dev->kobj, |
32694850 TM |
327 | &kobj_pkt_type_wqueue); |
328 | } | |
329 | } | |
330 | ||
331 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
332 | { | |
333 | pkt_kobj_remove(pd->kobj_stat); | |
334 | pkt_kobj_remove(pd->kobj_wqueue); | |
335 | if (class_pktcdvd) | |
ca0bf64d | 336 | device_unregister(pd->dev); |
32694850 TM |
337 | } |
338 | ||
339 | ||
340 | /******************************************************************** | |
341 | /sys/class/pktcdvd/ | |
342 | add map block device | |
343 | remove unmap packet dev | |
344 | device_map show mappings | |
345 | *******************************************************************/ | |
346 | ||
347 | static void class_pktcdvd_release(struct class *cls) | |
348 | { | |
349 | kfree(cls); | |
350 | } | |
28812fe1 AK |
351 | static ssize_t class_pktcdvd_show_map(struct class *c, |
352 | struct class_attribute *attr, | |
353 | char *data) | |
32694850 TM |
354 | { |
355 | int n = 0; | |
356 | int idx; | |
357 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
358 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
359 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
360 | if (!pd) | |
361 | continue; | |
362 | n += sprintf(data+n, "%s %u:%u %u:%u\n", | |
363 | pd->name, | |
364 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), | |
365 | MAJOR(pd->bdev->bd_dev), | |
366 | MINOR(pd->bdev->bd_dev)); | |
367 | } | |
368 | mutex_unlock(&ctl_mutex); | |
369 | return n; | |
370 | } | |
371 | ||
28812fe1 AK |
372 | static ssize_t class_pktcdvd_store_add(struct class *c, |
373 | struct class_attribute *attr, | |
374 | const char *buf, | |
32694850 TM |
375 | size_t count) |
376 | { | |
377 | unsigned int major, minor; | |
fffe487d | 378 | |
83f3aa3d | 379 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
fffe487d TH |
380 | /* pkt_setup_dev() expects caller to hold reference to self */ |
381 | if (!try_module_get(THIS_MODULE)) | |
382 | return -ENODEV; | |
383 | ||
32694850 | 384 | pkt_setup_dev(MKDEV(major, minor), NULL); |
fffe487d TH |
385 | |
386 | module_put(THIS_MODULE); | |
387 | ||
32694850 TM |
388 | return count; |
389 | } | |
fffe487d | 390 | |
32694850 TM |
391 | return -EINVAL; |
392 | } | |
393 | ||
28812fe1 AK |
394 | static ssize_t class_pktcdvd_store_remove(struct class *c, |
395 | struct class_attribute *attr, | |
396 | const char *buf, | |
32694850 TM |
397 | size_t count) |
398 | { | |
399 | unsigned int major, minor; | |
83f3aa3d | 400 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
32694850 TM |
401 | pkt_remove_dev(MKDEV(major, minor)); |
402 | return count; | |
403 | } | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
407 | static struct class_attribute class_pktcdvd_attrs[] = { | |
408 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), | |
409 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), | |
410 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), | |
411 | __ATTR_NULL | |
412 | }; | |
413 | ||
414 | ||
415 | static int pkt_sysfs_init(void) | |
416 | { | |
417 | int ret = 0; | |
418 | ||
419 | /* | |
420 | * create control files in sysfs | |
421 | * /sys/class/pktcdvd/... | |
422 | */ | |
423 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
424 | if (!class_pktcdvd) | |
425 | return -ENOMEM; | |
426 | class_pktcdvd->name = DRIVER_NAME; | |
427 | class_pktcdvd->owner = THIS_MODULE; | |
428 | class_pktcdvd->class_release = class_pktcdvd_release; | |
429 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; | |
430 | ret = class_register(class_pktcdvd); | |
431 | if (ret) { | |
432 | kfree(class_pktcdvd); | |
433 | class_pktcdvd = NULL; | |
99481334 | 434 | pr_err("failed to create class pktcdvd\n"); |
32694850 TM |
435 | return ret; |
436 | } | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static void pkt_sysfs_cleanup(void) | |
441 | { | |
442 | if (class_pktcdvd) | |
443 | class_destroy(class_pktcdvd); | |
444 | class_pktcdvd = NULL; | |
445 | } | |
446 | ||
447 | /******************************************************************** | |
448 | entries in debugfs | |
449 | ||
156f5a78 | 450 | /sys/kernel/debug/pktcdvd[0-7]/ |
32694850 TM |
451 | info |
452 | ||
453 | *******************************************************************/ | |
454 | ||
455 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
456 | { | |
457 | return pkt_seq_show(m, p); | |
458 | } | |
459 | ||
460 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
461 | { | |
462 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
463 | } | |
464 | ||
2b8693c0 | 465 | static const struct file_operations debug_fops = { |
32694850 TM |
466 | .open = pkt_debugfs_fops_open, |
467 | .read = seq_read, | |
468 | .llseek = seq_lseek, | |
469 | .release = single_release, | |
470 | .owner = THIS_MODULE, | |
471 | }; | |
472 | ||
473 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
474 | { | |
475 | if (!pkt_debugfs_root) | |
476 | return; | |
32694850 | 477 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); |
49c2856a | 478 | if (!pd->dfs_d_root) |
32694850 | 479 | return; |
49c2856a | 480 | |
32694850 TM |
481 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, |
482 | pd->dfs_d_root, pd, &debug_fops); | |
32694850 TM |
483 | } |
484 | ||
485 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
486 | { | |
487 | if (!pkt_debugfs_root) | |
488 | return; | |
49c2856a DC |
489 | debugfs_remove(pd->dfs_f_info); |
490 | debugfs_remove(pd->dfs_d_root); | |
32694850 | 491 | pd->dfs_f_info = NULL; |
32694850 TM |
492 | pd->dfs_d_root = NULL; |
493 | } | |
494 | ||
495 | static void pkt_debugfs_init(void) | |
496 | { | |
497 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
32694850 TM |
498 | } |
499 | ||
500 | static void pkt_debugfs_cleanup(void) | |
501 | { | |
32694850 TM |
502 | debugfs_remove(pkt_debugfs_root); |
503 | pkt_debugfs_root = NULL; | |
504 | } | |
505 | ||
506 | /* ----------------------------------------------------------*/ | |
507 | ||
1da177e4 LT |
508 | |
509 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
510 | { | |
511 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
512 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
844aa797 | 513 | pkt_dbg(2, pd, "queue empty\n"); |
1da177e4 LT |
514 | atomic_set(&pd->iosched.attention, 1); |
515 | wake_up(&pd->wqueue); | |
516 | } | |
517 | } | |
518 | ||
1da177e4 LT |
519 | /* |
520 | * Allocate a packet_data struct | |
521 | */ | |
e1bc89bc | 522 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
523 | { |
524 | int i; | |
525 | struct packet_data *pkt; | |
526 | ||
1107d2e0 | 527 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
528 | if (!pkt) |
529 | goto no_pkt; | |
1da177e4 | 530 | |
e1bc89bc | 531 | pkt->frames = frames; |
ccc5c9ca | 532 | pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames); |
1da177e4 LT |
533 | if (!pkt->w_bio) |
534 | goto no_bio; | |
535 | ||
e1bc89bc | 536 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
537 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
538 | if (!pkt->pages[i]) | |
539 | goto no_page; | |
540 | } | |
541 | ||
542 | spin_lock_init(&pkt->lock); | |
c5ecc484 | 543 | bio_list_init(&pkt->orig_bios); |
1da177e4 | 544 | |
e1bc89bc | 545 | for (i = 0; i < frames; i++) { |
ccc5c9ca | 546 | struct bio *bio = bio_kmalloc(GFP_KERNEL, 1); |
1da177e4 LT |
547 | if (!bio) |
548 | goto no_rd_bio; | |
ccc5c9ca | 549 | |
1da177e4 LT |
550 | pkt->r_bios[i] = bio; |
551 | } | |
552 | ||
553 | return pkt; | |
554 | ||
555 | no_rd_bio: | |
e1bc89bc | 556 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
557 | struct bio *bio = pkt->r_bios[i]; |
558 | if (bio) | |
559 | bio_put(bio); | |
560 | } | |
561 | ||
562 | no_page: | |
e1bc89bc | 563 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
564 | if (pkt->pages[i]) |
565 | __free_page(pkt->pages[i]); | |
566 | bio_put(pkt->w_bio); | |
567 | no_bio: | |
568 | kfree(pkt); | |
569 | no_pkt: | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | /* | |
574 | * Free a packet_data struct | |
575 | */ | |
576 | static void pkt_free_packet_data(struct packet_data *pkt) | |
577 | { | |
578 | int i; | |
579 | ||
e1bc89bc | 580 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
581 | struct bio *bio = pkt->r_bios[i]; |
582 | if (bio) | |
583 | bio_put(bio); | |
584 | } | |
e1bc89bc | 585 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
586 | __free_page(pkt->pages[i]); |
587 | bio_put(pkt->w_bio); | |
588 | kfree(pkt); | |
589 | } | |
590 | ||
591 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
592 | { | |
593 | struct packet_data *pkt, *next; | |
594 | ||
595 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
596 | ||
597 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
598 | pkt_free_packet_data(pkt); | |
599 | } | |
e1bc89bc | 600 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
601 | } |
602 | ||
603 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
604 | { | |
605 | struct packet_data *pkt; | |
606 | ||
e1bc89bc PO |
607 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
608 | ||
1da177e4 | 609 | while (nr_packets > 0) { |
e1bc89bc | 610 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
611 | if (!pkt) { |
612 | pkt_shrink_pktlist(pd); | |
613 | return 0; | |
614 | } | |
615 | pkt->id = nr_packets; | |
616 | pkt->pd = pd; | |
617 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
618 | nr_packets--; | |
619 | } | |
620 | return 1; | |
621 | } | |
622 | ||
1da177e4 LT |
623 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
624 | { | |
625 | struct rb_node *n = rb_next(&node->rb_node); | |
626 | if (!n) | |
627 | return NULL; | |
628 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
629 | } | |
630 | ||
ac893963 | 631 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
632 | { |
633 | rb_erase(&node->rb_node, &pd->bio_queue); | |
634 | mempool_free(node, pd->rb_pool); | |
635 | pd->bio_queue_size--; | |
636 | BUG_ON(pd->bio_queue_size < 0); | |
637 | } | |
638 | ||
639 | /* | |
640 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
641 | */ | |
642 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
643 | { | |
644 | struct rb_node *n = pd->bio_queue.rb_node; | |
645 | struct rb_node *next; | |
646 | struct pkt_rb_node *tmp; | |
647 | ||
648 | if (!n) { | |
649 | BUG_ON(pd->bio_queue_size > 0); | |
650 | return NULL; | |
651 | } | |
652 | ||
653 | for (;;) { | |
654 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
4f024f37 | 655 | if (s <= tmp->bio->bi_iter.bi_sector) |
1da177e4 LT |
656 | next = n->rb_left; |
657 | else | |
658 | next = n->rb_right; | |
659 | if (!next) | |
660 | break; | |
661 | n = next; | |
662 | } | |
663 | ||
4f024f37 | 664 | if (s > tmp->bio->bi_iter.bi_sector) { |
1da177e4 LT |
665 | tmp = pkt_rbtree_next(tmp); |
666 | if (!tmp) | |
667 | return NULL; | |
668 | } | |
4f024f37 | 669 | BUG_ON(s > tmp->bio->bi_iter.bi_sector); |
1da177e4 LT |
670 | return tmp; |
671 | } | |
672 | ||
673 | /* | |
674 | * Insert a node into the pd->bio_queue rb tree. | |
675 | */ | |
676 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
677 | { | |
678 | struct rb_node **p = &pd->bio_queue.rb_node; | |
679 | struct rb_node *parent = NULL; | |
4f024f37 | 680 | sector_t s = node->bio->bi_iter.bi_sector; |
1da177e4 LT |
681 | struct pkt_rb_node *tmp; |
682 | ||
683 | while (*p) { | |
684 | parent = *p; | |
685 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
4f024f37 | 686 | if (s < tmp->bio->bi_iter.bi_sector) |
1da177e4 LT |
687 | p = &(*p)->rb_left; |
688 | else | |
689 | p = &(*p)->rb_right; | |
690 | } | |
691 | rb_link_node(&node->rb_node, parent, p); | |
692 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
693 | pd->bio_queue_size++; | |
694 | } | |
695 | ||
1da177e4 LT |
696 | /* |
697 | * Send a packet_command to the underlying block device and | |
698 | * wait for completion. | |
699 | */ | |
700 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
701 | { | |
165125e1 | 702 | struct request_queue *q = bdev_get_queue(pd->bdev); |
1da177e4 | 703 | struct request *rq; |
406c9b60 CH |
704 | int ret = 0; |
705 | ||
706 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? | |
aebf526b | 707 | REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, __GFP_RECLAIM); |
a492f075 JL |
708 | if (IS_ERR(rq)) |
709 | return PTR_ERR(rq); | |
82ed4db4 | 710 | scsi_req_init(rq); |
406c9b60 CH |
711 | |
712 | if (cgc->buflen) { | |
8586ea96 | 713 | ret = blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, |
71baba4b | 714 | __GFP_RECLAIM); |
8586ea96 | 715 | if (ret) |
406c9b60 CH |
716 | goto out; |
717 | } | |
1da177e4 | 718 | |
82ed4db4 CH |
719 | scsi_req(rq)->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
720 | memcpy(scsi_req(rq)->cmd, cgc->cmd, CDROM_PACKET_SIZE); | |
1da177e4 | 721 | |
1da177e4 | 722 | rq->timeout = 60*HZ; |
1da177e4 | 723 | if (cgc->quiet) |
e8064021 | 724 | rq->rq_flags |= RQF_QUIET; |
1da177e4 | 725 | |
406c9b60 | 726 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
17d5363b | 727 | if (scsi_req(rq)->result) |
cbc31a47 | 728 | ret = -EIO; |
406c9b60 | 729 | out: |
1da177e4 | 730 | blk_put_request(rq); |
406c9b60 | 731 | return ret; |
1da177e4 LT |
732 | } |
733 | ||
99481334 JP |
734 | static const char *sense_key_string(__u8 index) |
735 | { | |
736 | static const char * const info[] = { | |
737 | "No sense", "Recovered error", "Not ready", | |
738 | "Medium error", "Hardware error", "Illegal request", | |
739 | "Unit attention", "Data protect", "Blank check", | |
740 | }; | |
741 | ||
742 | return index < ARRAY_SIZE(info) ? info[index] : "INVALID"; | |
743 | } | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * A generic sense dump / resolve mechanism should be implemented across | |
747 | * all ATAPI + SCSI devices. | |
748 | */ | |
f3ded788 JP |
749 | static void pkt_dump_sense(struct pktcdvd_device *pd, |
750 | struct packet_command *cgc) | |
1da177e4 | 751 | { |
1da177e4 LT |
752 | struct request_sense *sense = cgc->sense; |
753 | ||
99481334 | 754 | if (sense) |
f3ded788 JP |
755 | pkt_err(pd, "%*ph - sense %02x.%02x.%02x (%s)\n", |
756 | CDROM_PACKET_SIZE, cgc->cmd, | |
757 | sense->sense_key, sense->asc, sense->ascq, | |
758 | sense_key_string(sense->sense_key)); | |
99481334 | 759 | else |
f3ded788 | 760 | pkt_err(pd, "%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd); |
1da177e4 LT |
761 | } |
762 | ||
763 | /* | |
764 | * flush the drive cache to media | |
765 | */ | |
766 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
767 | { | |
768 | struct packet_command cgc; | |
769 | ||
770 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
771 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
772 | cgc.quiet = 1; | |
773 | ||
774 | /* | |
775 | * the IMMED bit -- we default to not setting it, although that | |
776 | * would allow a much faster close, this is safer | |
777 | */ | |
778 | #if 0 | |
779 | cgc.cmd[1] = 1 << 1; | |
780 | #endif | |
781 | return pkt_generic_packet(pd, &cgc); | |
782 | } | |
783 | ||
784 | /* | |
785 | * speed is given as the normal factor, e.g. 4 for 4x | |
786 | */ | |
05680d86 PO |
787 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
788 | unsigned write_speed, unsigned read_speed) | |
1da177e4 LT |
789 | { |
790 | struct packet_command cgc; | |
791 | struct request_sense sense; | |
792 | int ret; | |
793 | ||
794 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
795 | cgc.sense = &sense; | |
796 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
797 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
798 | cgc.cmd[3] = read_speed & 0xff; | |
799 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
800 | cgc.cmd[5] = write_speed & 0xff; | |
801 | ||
802 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
f3ded788 | 803 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
804 | |
805 | return ret; | |
806 | } | |
807 | ||
808 | /* | |
809 | * Queue a bio for processing by the low-level CD device. Must be called | |
810 | * from process context. | |
811 | */ | |
46c271be | 812 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
813 | { |
814 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
815 | if (bio_data_dir(bio) == READ) |
816 | bio_list_add(&pd->iosched.read_queue, bio); | |
817 | else | |
818 | bio_list_add(&pd->iosched.write_queue, bio); | |
1da177e4 LT |
819 | spin_unlock(&pd->iosched.lock); |
820 | ||
821 | atomic_set(&pd->iosched.attention, 1); | |
822 | wake_up(&pd->wqueue); | |
823 | } | |
824 | ||
825 | /* | |
826 | * Process the queued read/write requests. This function handles special | |
827 | * requirements for CDRW drives: | |
828 | * - A cache flush command must be inserted before a read request if the | |
829 | * previous request was a write. | |
46c271be | 830 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 831 | * than necessary. |
46c271be PO |
832 | * - Optimize for throughput at the expense of latency. This means that streaming |
833 | * writes will never be interrupted by a read, but if the drive has to seek | |
834 | * before the next write, switch to reading instead if there are any pending | |
835 | * read requests. | |
1da177e4 LT |
836 | * - Set the read speed according to current usage pattern. When only reading |
837 | * from the device, it's best to use the highest possible read speed, but | |
838 | * when switching often between reading and writing, it's better to have the | |
839 | * same read and write speeds. | |
1da177e4 LT |
840 | */ |
841 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
842 | { | |
1da177e4 LT |
843 | |
844 | if (atomic_read(&pd->iosched.attention) == 0) | |
845 | return; | |
846 | atomic_set(&pd->iosched.attention, 0); | |
847 | ||
1da177e4 LT |
848 | for (;;) { |
849 | struct bio *bio; | |
46c271be | 850 | int reads_queued, writes_queued; |
1da177e4 LT |
851 | |
852 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
853 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); |
854 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); | |
1da177e4 LT |
855 | spin_unlock(&pd->iosched.lock); |
856 | ||
857 | if (!reads_queued && !writes_queued) | |
858 | break; | |
859 | ||
860 | if (pd->iosched.writing) { | |
46c271be PO |
861 | int need_write_seek = 1; |
862 | spin_lock(&pd->iosched.lock); | |
c5ecc484 | 863 | bio = bio_list_peek(&pd->iosched.write_queue); |
46c271be | 864 | spin_unlock(&pd->iosched.lock); |
4f024f37 KO |
865 | if (bio && (bio->bi_iter.bi_sector == |
866 | pd->iosched.last_write)) | |
46c271be PO |
867 | need_write_seek = 0; |
868 | if (need_write_seek && reads_queued) { | |
1da177e4 | 869 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
844aa797 | 870 | pkt_dbg(2, pd, "write, waiting\n"); |
1da177e4 LT |
871 | break; |
872 | } | |
873 | pkt_flush_cache(pd); | |
874 | pd->iosched.writing = 0; | |
875 | } | |
876 | } else { | |
877 | if (!reads_queued && writes_queued) { | |
878 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
844aa797 | 879 | pkt_dbg(2, pd, "read, waiting\n"); |
1da177e4 LT |
880 | break; |
881 | } | |
882 | pd->iosched.writing = 1; | |
883 | } | |
884 | } | |
885 | ||
886 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
887 | if (pd->iosched.writing) |
888 | bio = bio_list_pop(&pd->iosched.write_queue); | |
889 | else | |
890 | bio = bio_list_pop(&pd->iosched.read_queue); | |
1da177e4 LT |
891 | spin_unlock(&pd->iosched.lock); |
892 | ||
893 | if (!bio) | |
894 | continue; | |
895 | ||
896 | if (bio_data_dir(bio) == READ) | |
4f024f37 KO |
897 | pd->iosched.successive_reads += |
898 | bio->bi_iter.bi_size >> 10; | |
46c271be | 899 | else { |
1da177e4 | 900 | pd->iosched.successive_reads = 0; |
f73a1c7d | 901 | pd->iosched.last_write = bio_end_sector(bio); |
46c271be | 902 | } |
1da177e4 LT |
903 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
904 | if (pd->read_speed == pd->write_speed) { | |
905 | pd->read_speed = MAX_SPEED; | |
906 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
907 | } | |
908 | } else { | |
909 | if (pd->read_speed != pd->write_speed) { | |
910 | pd->read_speed = pd->write_speed; | |
911 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
912 | } | |
913 | } | |
914 | ||
915 | atomic_inc(&pd->cdrw.pending_bios); | |
916 | generic_make_request(bio); | |
917 | } | |
918 | } | |
919 | ||
920 | /* | |
921 | * Special care is needed if the underlying block device has a small | |
922 | * max_phys_segments value. | |
923 | */ | |
165125e1 | 924 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
1da177e4 | 925 | { |
ae03bf63 | 926 | if ((pd->settings.size << 9) / CD_FRAMESIZE |
8a78362c | 927 | <= queue_max_segments(q)) { |
1da177e4 LT |
928 | /* |
929 | * The cdrom device can handle one segment/frame | |
930 | */ | |
931 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
932 | return 0; | |
ae03bf63 | 933 | } else if ((pd->settings.size << 9) / PAGE_SIZE |
8a78362c | 934 | <= queue_max_segments(q)) { |
1da177e4 LT |
935 | /* |
936 | * We can handle this case at the expense of some extra memory | |
937 | * copies during write operations | |
938 | */ | |
939 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
940 | return 0; | |
941 | } else { | |
fa63c0ab | 942 | pkt_err(pd, "cdrom max_phys_segments too small\n"); |
1da177e4 LT |
943 | return -EIO; |
944 | } | |
945 | } | |
946 | ||
4246a0b6 | 947 | static void pkt_end_io_read(struct bio *bio) |
1da177e4 LT |
948 | { |
949 | struct packet_data *pkt = bio->bi_private; | |
950 | struct pktcdvd_device *pd = pkt->pd; | |
951 | BUG_ON(!pd); | |
952 | ||
844aa797 | 953 | pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n", |
cd3f2cd0 | 954 | bio, (unsigned long long)pkt->sector, |
4246a0b6 | 955 | (unsigned long long)bio->bi_iter.bi_sector, bio->bi_error); |
1da177e4 | 956 | |
4246a0b6 | 957 | if (bio->bi_error) |
1da177e4 LT |
958 | atomic_inc(&pkt->io_errors); |
959 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
960 | atomic_inc(&pkt->run_sm); | |
961 | wake_up(&pd->wqueue); | |
962 | } | |
963 | pkt_bio_finished(pd); | |
1da177e4 LT |
964 | } |
965 | ||
4246a0b6 | 966 | static void pkt_end_io_packet_write(struct bio *bio) |
1da177e4 LT |
967 | { |
968 | struct packet_data *pkt = bio->bi_private; | |
969 | struct pktcdvd_device *pd = pkt->pd; | |
970 | BUG_ON(!pd); | |
971 | ||
4246a0b6 | 972 | pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, bio->bi_error); |
1da177e4 LT |
973 | |
974 | pd->stats.pkt_ended++; | |
975 | ||
976 | pkt_bio_finished(pd); | |
977 | atomic_dec(&pkt->io_wait); | |
978 | atomic_inc(&pkt->run_sm); | |
979 | wake_up(&pd->wqueue); | |
1da177e4 LT |
980 | } |
981 | ||
982 | /* | |
983 | * Schedule reads for the holes in a packet | |
984 | */ | |
985 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
986 | { | |
987 | int frames_read = 0; | |
988 | struct bio *bio; | |
989 | int f; | |
990 | char written[PACKET_MAX_SIZE]; | |
991 | ||
c5ecc484 | 992 | BUG_ON(bio_list_empty(&pkt->orig_bios)); |
1da177e4 LT |
993 | |
994 | atomic_set(&pkt->io_wait, 0); | |
995 | atomic_set(&pkt->io_errors, 0); | |
996 | ||
1da177e4 LT |
997 | /* |
998 | * Figure out which frames we need to read before we can write. | |
999 | */ | |
1000 | memset(written, 0, sizeof(written)); | |
1001 | spin_lock(&pkt->lock); | |
c5ecc484 | 1002 | bio_list_for_each(bio, &pkt->orig_bios) { |
4f024f37 KO |
1003 | int first_frame = (bio->bi_iter.bi_sector - pkt->sector) / |
1004 | (CD_FRAMESIZE >> 9); | |
1005 | int num_frames = bio->bi_iter.bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1006 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1007 | BUG_ON(first_frame < 0); |
1008 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1009 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1010 | written[f] = 1; | |
1011 | } | |
1012 | spin_unlock(&pkt->lock); | |
1013 | ||
06e7ab53 | 1014 | if (pkt->cache_valid) { |
844aa797 | 1015 | pkt_dbg(2, pd, "zone %llx cached\n", |
06e7ab53 PO |
1016 | (unsigned long long)pkt->sector); |
1017 | goto out_account; | |
1018 | } | |
1019 | ||
1da177e4 LT |
1020 | /* |
1021 | * Schedule reads for missing parts of the packet. | |
1022 | */ | |
1023 | for (f = 0; f < pkt->frames; f++) { | |
1024 | int p, offset; | |
ccc5c9ca | 1025 | |
1da177e4 LT |
1026 | if (written[f]) |
1027 | continue; | |
ccc5c9ca | 1028 | |
1da177e4 | 1029 | bio = pkt->r_bios[f]; |
ccc5c9ca | 1030 | bio_reset(bio); |
4f024f37 | 1031 | bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1032 | bio->bi_bdev = pd->bdev; |
1033 | bio->bi_end_io = pkt_end_io_read; | |
1034 | bio->bi_private = pkt; | |
1035 | ||
1036 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1037 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
844aa797 | 1038 | pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n", |
1da177e4 LT |
1039 | f, pkt->pages[p], offset); |
1040 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1041 | BUG(); | |
1042 | ||
1043 | atomic_inc(&pkt->io_wait); | |
95fe6c1a | 1044 | bio_set_op_attrs(bio, REQ_OP_READ, 0); |
46c271be | 1045 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1046 | frames_read++; |
1047 | } | |
1048 | ||
1049 | out_account: | |
844aa797 | 1050 | pkt_dbg(2, pd, "need %d frames for zone %llx\n", |
1da177e4 LT |
1051 | frames_read, (unsigned long long)pkt->sector); |
1052 | pd->stats.pkt_started++; | |
1053 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1054 | } |
1055 | ||
1056 | /* | |
1057 | * Find a packet matching zone, or the least recently used packet if | |
1058 | * there is no match. | |
1059 | */ | |
1060 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1061 | { | |
1062 | struct packet_data *pkt; | |
1063 | ||
1064 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1065 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1066 | list_del_init(&pkt->list); | |
1067 | if (pkt->sector != zone) | |
1068 | pkt->cache_valid = 0; | |
610827de | 1069 | return pkt; |
1da177e4 LT |
1070 | } |
1071 | } | |
610827de PO |
1072 | BUG(); |
1073 | return NULL; | |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1077 | { | |
1078 | if (pkt->cache_valid) { | |
1079 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1080 | } else { | |
1081 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * recover a failed write, query for relocation if possible | |
1087 | * | |
1088 | * returns 1 if recovery is possible, or 0 if not | |
1089 | * | |
1090 | */ | |
1091 | static int pkt_start_recovery(struct packet_data *pkt) | |
1092 | { | |
1093 | /* | |
1094 | * FIXME. We need help from the file system to implement | |
1095 | * recovery handling. | |
1096 | */ | |
1097 | return 0; | |
1098 | #if 0 | |
1099 | struct request *rq = pkt->rq; | |
1100 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1101 | struct block_device *pkt_bdev; | |
1102 | struct super_block *sb = NULL; | |
1103 | unsigned long old_block, new_block; | |
1104 | sector_t new_sector; | |
1105 | ||
1106 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1107 | if (pkt_bdev) { | |
1108 | sb = get_super(pkt_bdev); | |
1109 | bdput(pkt_bdev); | |
1110 | } | |
1111 | ||
1112 | if (!sb) | |
1113 | return 0; | |
1114 | ||
e7f59097 | 1115 | if (!sb->s_op->relocate_blocks) |
1da177e4 LT |
1116 | goto out; |
1117 | ||
1118 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1119 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1120 | goto out; | |
1121 | ||
1122 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1123 | pkt->sector = new_sector; | |
1124 | ||
ff8e0070 KO |
1125 | bio_reset(pkt->bio); |
1126 | pkt->bio->bi_bdev = pd->bdev; | |
1eff9d32 | 1127 | bio_set_op_attrs(pkt->bio, REQ_OP_WRITE, 0); |
4f024f37 KO |
1128 | pkt->bio->bi_iter.bi_sector = new_sector; |
1129 | pkt->bio->bi_iter.bi_size = pkt->frames * CD_FRAMESIZE; | |
ff8e0070 | 1130 | pkt->bio->bi_vcnt = pkt->frames; |
1da177e4 | 1131 | |
ff8e0070 KO |
1132 | pkt->bio->bi_end_io = pkt_end_io_packet_write; |
1133 | pkt->bio->bi_private = pkt; | |
1da177e4 LT |
1134 | |
1135 | drop_super(sb); | |
1136 | return 1; | |
1137 | ||
1138 | out: | |
1139 | drop_super(sb); | |
1140 | return 0; | |
1141 | #endif | |
1142 | } | |
1143 | ||
1144 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1145 | { | |
1146 | #if PACKET_DEBUG > 1 | |
1147 | static const char *state_name[] = { | |
1148 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1149 | }; | |
1150 | enum packet_data_state old_state = pkt->state; | |
844aa797 | 1151 | pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n", |
cd3f2cd0 | 1152 | pkt->id, (unsigned long long)pkt->sector, |
1da177e4 LT |
1153 | state_name[old_state], state_name[state]); |
1154 | #endif | |
1155 | pkt->state = state; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * Scan the work queue to see if we can start a new packet. | |
1160 | * returns non-zero if any work was done. | |
1161 | */ | |
1162 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1163 | { | |
1164 | struct packet_data *pkt, *p; | |
1165 | struct bio *bio = NULL; | |
1166 | sector_t zone = 0; /* Suppress gcc warning */ | |
1167 | struct pkt_rb_node *node, *first_node; | |
1168 | struct rb_node *n; | |
0a0fc960 | 1169 | int wakeup; |
1da177e4 | 1170 | |
1da177e4 LT |
1171 | atomic_set(&pd->scan_queue, 0); |
1172 | ||
1173 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
844aa797 | 1174 | pkt_dbg(2, pd, "no pkt\n"); |
1da177e4 LT |
1175 | return 0; |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * Try to find a zone we are not already working on. | |
1180 | */ | |
1181 | spin_lock(&pd->lock); | |
1182 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1183 | if (!first_node) { | |
1184 | n = rb_first(&pd->bio_queue); | |
1185 | if (n) | |
1186 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1187 | } | |
1188 | node = first_node; | |
1189 | while (node) { | |
1190 | bio = node->bio; | |
4f024f37 | 1191 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 | 1192 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
7baeb6a5 PO |
1193 | if (p->sector == zone) { |
1194 | bio = NULL; | |
1da177e4 | 1195 | goto try_next_bio; |
7baeb6a5 | 1196 | } |
1da177e4 LT |
1197 | } |
1198 | break; | |
1199 | try_next_bio: | |
1200 | node = pkt_rbtree_next(node); | |
1201 | if (!node) { | |
1202 | n = rb_first(&pd->bio_queue); | |
1203 | if (n) | |
1204 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1205 | } | |
1206 | if (node == first_node) | |
1207 | node = NULL; | |
1208 | } | |
1209 | spin_unlock(&pd->lock); | |
1210 | if (!bio) { | |
844aa797 | 1211 | pkt_dbg(2, pd, "no bio\n"); |
1da177e4 LT |
1212 | return 0; |
1213 | } | |
1214 | ||
1215 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1216 | |
1217 | pd->current_sector = zone + pd->settings.size; | |
1218 | pkt->sector = zone; | |
e1bc89bc | 1219 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1220 | pkt->write_size = 0; |
1221 | ||
1222 | /* | |
1223 | * Scan work queue for bios in the same zone and link them | |
1224 | * to this packet. | |
1225 | */ | |
1226 | spin_lock(&pd->lock); | |
844aa797 | 1227 | pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone); |
1da177e4 LT |
1228 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
1229 | bio = node->bio; | |
4f024f37 KO |
1230 | pkt_dbg(2, pd, "found zone=%llx\n", (unsigned long long) |
1231 | get_zone(bio->bi_iter.bi_sector, pd)); | |
1232 | if (get_zone(bio->bi_iter.bi_sector, pd) != zone) | |
1da177e4 LT |
1233 | break; |
1234 | pkt_rbtree_erase(pd, node); | |
1235 | spin_lock(&pkt->lock); | |
c5ecc484 | 1236 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 | 1237 | pkt->write_size += bio->bi_iter.bi_size / CD_FRAMESIZE; |
1da177e4 LT |
1238 | spin_unlock(&pkt->lock); |
1239 | } | |
0a0fc960 TM |
1240 | /* check write congestion marks, and if bio_queue_size is |
1241 | below, wake up any waiters */ | |
1242 | wakeup = (pd->write_congestion_on > 0 | |
1243 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1244 | spin_unlock(&pd->lock); |
8aa7e847 | 1245 | if (wakeup) { |
dc3b17cc | 1246 | clear_bdi_congested(pd->disk->queue->backing_dev_info, |
8aa7e847 JA |
1247 | BLK_RW_ASYNC); |
1248 | } | |
1da177e4 LT |
1249 | |
1250 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1251 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1252 | atomic_set(&pkt->run_sm, 1); | |
1253 | ||
1254 | spin_lock(&pd->cdrw.active_list_lock); | |
1255 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1256 | spin_unlock(&pd->cdrw.active_list_lock); | |
1257 | ||
1258 | return 1; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Assemble a bio to write one packet and queue the bio for processing | |
1263 | * by the underlying block device. | |
1264 | */ | |
1265 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1266 | { | |
1da177e4 | 1267 | int f; |
1da177e4 | 1268 | |
ffb25dc6 | 1269 | bio_reset(pkt->w_bio); |
4f024f37 | 1270 | pkt->w_bio->bi_iter.bi_sector = pkt->sector; |
ffb25dc6 KO |
1271 | pkt->w_bio->bi_bdev = pd->bdev; |
1272 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1273 | pkt->w_bio->bi_private = pkt; | |
1274 | ||
1275 | /* XXX: locking? */ | |
1da177e4 | 1276 | for (f = 0; f < pkt->frames; f++) { |
feebd568 CH |
1277 | struct page *page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1278 | unsigned offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1279 | ||
1280 | if (!bio_add_page(pkt->w_bio, page, CD_FRAMESIZE, offset)) | |
ffb25dc6 | 1281 | BUG(); |
1da177e4 | 1282 | } |
844aa797 | 1283 | pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1284 | |
1285 | /* | |
72772323 | 1286 | * Fill-in bvec with data from orig_bios. |
1da177e4 | 1287 | */ |
1da177e4 | 1288 | spin_lock(&pkt->lock); |
ffb25dc6 | 1289 | bio_copy_data(pkt->w_bio, pkt->orig_bios.head); |
1da177e4 | 1290 | |
1da177e4 LT |
1291 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
1292 | spin_unlock(&pkt->lock); | |
1293 | ||
844aa797 | 1294 | pkt_dbg(2, pd, "Writing %d frames for zone %llx\n", |
ffb25dc6 | 1295 | pkt->write_size, (unsigned long long)pkt->sector); |
1da177e4 | 1296 | |
feebd568 | 1297 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) |
1da177e4 | 1298 | pkt->cache_valid = 1; |
feebd568 | 1299 | else |
1da177e4 | 1300 | pkt->cache_valid = 0; |
1da177e4 LT |
1301 | |
1302 | /* Start the write request */ | |
1da177e4 | 1303 | atomic_set(&pkt->io_wait, 1); |
95fe6c1a | 1304 | bio_set_op_attrs(pkt->w_bio, REQ_OP_WRITE, 0); |
46c271be | 1305 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1306 | } |
1307 | ||
4246a0b6 | 1308 | static void pkt_finish_packet(struct packet_data *pkt, int error) |
1da177e4 | 1309 | { |
c5ecc484 | 1310 | struct bio *bio; |
1da177e4 | 1311 | |
4246a0b6 | 1312 | if (error) |
1da177e4 LT |
1313 | pkt->cache_valid = 0; |
1314 | ||
1315 | /* Finish all bios corresponding to this packet */ | |
4246a0b6 CH |
1316 | while ((bio = bio_list_pop(&pkt->orig_bios))) { |
1317 | bio->bi_error = error; | |
1318 | bio_endio(bio); | |
1319 | } | |
1da177e4 LT |
1320 | } |
1321 | ||
1322 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1323 | { | |
844aa797 | 1324 | pkt_dbg(2, pd, "pkt %d\n", pkt->id); |
1da177e4 LT |
1325 | |
1326 | for (;;) { | |
1327 | switch (pkt->state) { | |
1328 | case PACKET_WAITING_STATE: | |
1329 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1330 | return; | |
1331 | ||
1332 | pkt->sleep_time = 0; | |
1333 | pkt_gather_data(pd, pkt); | |
1334 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1335 | break; | |
1336 | ||
1337 | case PACKET_READ_WAIT_STATE: | |
1338 | if (atomic_read(&pkt->io_wait) > 0) | |
1339 | return; | |
1340 | ||
1341 | if (atomic_read(&pkt->io_errors) > 0) { | |
1342 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1343 | } else { | |
1344 | pkt_start_write(pd, pkt); | |
1345 | } | |
1346 | break; | |
1347 | ||
1348 | case PACKET_WRITE_WAIT_STATE: | |
1349 | if (atomic_read(&pkt->io_wait) > 0) | |
1350 | return; | |
1351 | ||
4246a0b6 | 1352 | if (!pkt->w_bio->bi_error) { |
1da177e4 LT |
1353 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1354 | } else { | |
1355 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1356 | } | |
1357 | break; | |
1358 | ||
1359 | case PACKET_RECOVERY_STATE: | |
1360 | if (pkt_start_recovery(pkt)) { | |
1361 | pkt_start_write(pd, pkt); | |
1362 | } else { | |
844aa797 | 1363 | pkt_dbg(2, pd, "No recovery possible\n"); |
1da177e4 LT |
1364 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1365 | } | |
1366 | break; | |
1367 | ||
1368 | case PACKET_FINISHED_STATE: | |
4246a0b6 | 1369 | pkt_finish_packet(pkt, pkt->w_bio->bi_error); |
1da177e4 LT |
1370 | return; |
1371 | ||
1372 | default: | |
1373 | BUG(); | |
1374 | break; | |
1375 | } | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1380 | { | |
1381 | struct packet_data *pkt, *next; | |
1382 | ||
1da177e4 LT |
1383 | /* |
1384 | * Run state machine for active packets | |
1385 | */ | |
1386 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1387 | if (atomic_read(&pkt->run_sm) > 0) { | |
1388 | atomic_set(&pkt->run_sm, 0); | |
1389 | pkt_run_state_machine(pd, pkt); | |
1390 | } | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Move no longer active packets to the free list | |
1395 | */ | |
1396 | spin_lock(&pd->cdrw.active_list_lock); | |
1397 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1398 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1399 | list_del(&pkt->list); | |
1400 | pkt_put_packet_data(pd, pkt); | |
1401 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1402 | atomic_set(&pd->scan_queue, 1); | |
1403 | } | |
1404 | } | |
1405 | spin_unlock(&pd->cdrw.active_list_lock); | |
1406 | } | |
1407 | ||
1408 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1409 | { | |
1410 | struct packet_data *pkt; | |
1411 | int i; | |
1412 | ||
ae7642bb | 1413 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1414 | states[i] = 0; |
1415 | ||
1416 | spin_lock(&pd->cdrw.active_list_lock); | |
1417 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1418 | states[pkt->state]++; | |
1419 | } | |
1420 | spin_unlock(&pd->cdrw.active_list_lock); | |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * kcdrwd is woken up when writes have been queued for one of our | |
1425 | * registered devices | |
1426 | */ | |
1427 | static int kcdrwd(void *foobar) | |
1428 | { | |
1429 | struct pktcdvd_device *pd = foobar; | |
1430 | struct packet_data *pkt; | |
1431 | long min_sleep_time, residue; | |
1432 | ||
8698a745 | 1433 | set_user_nice(current, MIN_NICE); |
83144186 | 1434 | set_freezable(); |
1da177e4 LT |
1435 | |
1436 | for (;;) { | |
1437 | DECLARE_WAITQUEUE(wait, current); | |
1438 | ||
1439 | /* | |
1440 | * Wait until there is something to do | |
1441 | */ | |
1442 | add_wait_queue(&pd->wqueue, &wait); | |
1443 | for (;;) { | |
1444 | set_current_state(TASK_INTERRUPTIBLE); | |
1445 | ||
1446 | /* Check if we need to run pkt_handle_queue */ | |
1447 | if (atomic_read(&pd->scan_queue) > 0) | |
1448 | goto work_to_do; | |
1449 | ||
1450 | /* Check if we need to run the state machine for some packet */ | |
1451 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1452 | if (atomic_read(&pkt->run_sm) > 0) | |
1453 | goto work_to_do; | |
1454 | } | |
1455 | ||
1456 | /* Check if we need to process the iosched queues */ | |
1457 | if (atomic_read(&pd->iosched.attention) != 0) | |
1458 | goto work_to_do; | |
1459 | ||
1460 | /* Otherwise, go to sleep */ | |
1461 | if (PACKET_DEBUG > 1) { | |
1462 | int states[PACKET_NUM_STATES]; | |
1463 | pkt_count_states(pd, states); | |
844aa797 | 1464 | pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
cd3f2cd0 JP |
1465 | states[0], states[1], states[2], |
1466 | states[3], states[4], states[5]); | |
1da177e4 LT |
1467 | } |
1468 | ||
1469 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1470 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1471 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1472 | min_sleep_time = pkt->sleep_time; | |
1473 | } | |
1474 | ||
844aa797 | 1475 | pkt_dbg(2, pd, "sleeping\n"); |
1da177e4 | 1476 | residue = schedule_timeout(min_sleep_time); |
844aa797 | 1477 | pkt_dbg(2, pd, "wake up\n"); |
1da177e4 LT |
1478 | |
1479 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1480 | try_to_freeze(); |
1da177e4 LT |
1481 | |
1482 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1483 | if (!pkt->sleep_time) | |
1484 | continue; | |
1485 | pkt->sleep_time -= min_sleep_time - residue; | |
1486 | if (pkt->sleep_time <= 0) { | |
1487 | pkt->sleep_time = 0; | |
1488 | atomic_inc(&pkt->run_sm); | |
1489 | } | |
1490 | } | |
1491 | ||
1da177e4 LT |
1492 | if (kthread_should_stop()) |
1493 | break; | |
1494 | } | |
1495 | work_to_do: | |
1496 | set_current_state(TASK_RUNNING); | |
1497 | remove_wait_queue(&pd->wqueue, &wait); | |
1498 | ||
1499 | if (kthread_should_stop()) | |
1500 | break; | |
1501 | ||
1502 | /* | |
1503 | * if pkt_handle_queue returns true, we can queue | |
1504 | * another request. | |
1505 | */ | |
1506 | while (pkt_handle_queue(pd)) | |
1507 | ; | |
1508 | ||
1509 | /* | |
1510 | * Handle packet state machine | |
1511 | */ | |
1512 | pkt_handle_packets(pd); | |
1513 | ||
1514 | /* | |
1515 | * Handle iosched queues | |
1516 | */ | |
1517 | pkt_iosched_process_queue(pd); | |
1518 | } | |
1519 | ||
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1524 | { | |
0c075d64 JP |
1525 | pkt_info(pd, "%s packets, %u blocks, Mode-%c disc\n", |
1526 | pd->settings.fp ? "Fixed" : "Variable", | |
1527 | pd->settings.size >> 2, | |
1528 | pd->settings.block_mode == 8 ? '1' : '2'); | |
1da177e4 LT |
1529 | } |
1530 | ||
1531 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1532 | { | |
1533 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1534 | ||
1535 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1536 | cgc->cmd[2] = page_code | (page_control << 6); | |
1537 | cgc->cmd[7] = cgc->buflen >> 8; | |
1538 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1539 | cgc->data_direction = CGC_DATA_READ; | |
1540 | return pkt_generic_packet(pd, cgc); | |
1541 | } | |
1542 | ||
1543 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1544 | { | |
1545 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1546 | memset(cgc->buffer, 0, 2); | |
1547 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1548 | cgc->cmd[1] = 0x10; /* PF */ | |
1549 | cgc->cmd[7] = cgc->buflen >> 8; | |
1550 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1551 | cgc->data_direction = CGC_DATA_WRITE; | |
1552 | return pkt_generic_packet(pd, cgc); | |
1553 | } | |
1554 | ||
1555 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1556 | { | |
1557 | struct packet_command cgc; | |
1558 | int ret; | |
1559 | ||
1560 | /* set up command and get the disc info */ | |
1561 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1562 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1563 | cgc.cmd[8] = cgc.buflen = 2; | |
1564 | cgc.quiet = 1; | |
1565 | ||
1566 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1567 | return ret; | |
1568 | ||
1569 | /* not all drives have the same disc_info length, so requeue | |
1570 | * packet with the length the drive tells us it can supply | |
1571 | */ | |
1572 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1573 | sizeof(di->disc_information_length); | |
1574 | ||
1575 | if (cgc.buflen > sizeof(disc_information)) | |
1576 | cgc.buflen = sizeof(disc_information); | |
1577 | ||
1578 | cgc.cmd[8] = cgc.buflen; | |
1579 | return pkt_generic_packet(pd, &cgc); | |
1580 | } | |
1581 | ||
1582 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1583 | { | |
1584 | struct packet_command cgc; | |
1585 | int ret; | |
1586 | ||
1587 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1588 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1589 | cgc.cmd[1] = type & 3; | |
1590 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1591 | cgc.cmd[5] = track & 0xff; | |
1592 | cgc.cmd[8] = 8; | |
1593 | cgc.quiet = 1; | |
1594 | ||
1595 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1596 | return ret; | |
1597 | ||
1598 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1599 | sizeof(ti->track_information_length); | |
1600 | ||
1601 | if (cgc.buflen > sizeof(track_information)) | |
1602 | cgc.buflen = sizeof(track_information); | |
1603 | ||
1604 | cgc.cmd[8] = cgc.buflen; | |
1605 | return pkt_generic_packet(pd, &cgc); | |
1606 | } | |
1607 | ||
05680d86 PO |
1608 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1609 | long *last_written) | |
1da177e4 LT |
1610 | { |
1611 | disc_information di; | |
1612 | track_information ti; | |
1613 | __u32 last_track; | |
1614 | int ret = -1; | |
1615 | ||
1616 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1617 | return ret; | |
1618 | ||
1619 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1620 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1621 | return ret; | |
1622 | ||
1623 | /* if this track is blank, try the previous. */ | |
1624 | if (ti.blank) { | |
1625 | last_track--; | |
1626 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1627 | return ret; | |
1628 | } | |
1629 | ||
1630 | /* if last recorded field is valid, return it. */ | |
1631 | if (ti.lra_v) { | |
1632 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1633 | } else { | |
1634 | /* make it up instead */ | |
1635 | *last_written = be32_to_cpu(ti.track_start) + | |
1636 | be32_to_cpu(ti.track_size); | |
1637 | if (ti.free_blocks) | |
1638 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1639 | } | |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * write mode select package based on pd->settings | |
1645 | */ | |
05680d86 | 1646 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1647 | { |
1648 | struct packet_command cgc; | |
1649 | struct request_sense sense; | |
1650 | write_param_page *wp; | |
1651 | char buffer[128]; | |
1652 | int ret, size; | |
1653 | ||
1654 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1655 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1656 | return 0; | |
1657 | ||
1658 | memset(buffer, 0, sizeof(buffer)); | |
1659 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1660 | cgc.sense = &sense; | |
1661 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
f3ded788 | 1662 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1663 | return ret; |
1664 | } | |
1665 | ||
1666 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1667 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1668 | if (size > sizeof(buffer)) | |
1669 | size = sizeof(buffer); | |
1670 | ||
1671 | /* | |
1672 | * now get it all | |
1673 | */ | |
1674 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1675 | cgc.sense = &sense; | |
1676 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
f3ded788 | 1677 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1678 | return ret; |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * write page is offset header + block descriptor length | |
1683 | */ | |
1684 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1685 | ||
1686 | wp->fp = pd->settings.fp; | |
1687 | wp->track_mode = pd->settings.track_mode; | |
1688 | wp->write_type = pd->settings.write_type; | |
1689 | wp->data_block_type = pd->settings.block_mode; | |
1690 | ||
1691 | wp->multi_session = 0; | |
1692 | ||
1693 | #ifdef PACKET_USE_LS | |
1694 | wp->link_size = 7; | |
1695 | wp->ls_v = 1; | |
1696 | #endif | |
1697 | ||
1698 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1699 | wp->session_format = 0; | |
1700 | wp->subhdr2 = 0x20; | |
1701 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1702 | wp->session_format = 0x20; | |
1703 | wp->subhdr2 = 8; | |
1704 | #if 0 | |
1705 | wp->mcn[0] = 0x80; | |
1706 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1707 | #endif | |
1708 | } else { | |
1709 | /* | |
1710 | * paranoia | |
1711 | */ | |
fa63c0ab | 1712 | pkt_err(pd, "write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1713 | return 1; |
1714 | } | |
1715 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1716 | ||
1717 | cgc.buflen = cgc.cmd[8] = size; | |
1718 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
f3ded788 | 1719 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1720 | return ret; |
1721 | } | |
1722 | ||
1723 | pkt_print_settings(pd); | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | /* | |
7c613d59 | 1728 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1729 | */ |
ab863ec3 | 1730 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1731 | { |
ab863ec3 PO |
1732 | switch (pd->mmc3_profile) { |
1733 | case 0x1a: /* DVD+RW */ | |
1734 | case 0x12: /* DVD-RAM */ | |
1735 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1736 | return 1; | |
1737 | default: | |
1738 | break; | |
1739 | } | |
1da177e4 | 1740 | |
ab863ec3 PO |
1741 | if (!ti->packet || !ti->fp) |
1742 | return 0; | |
1da177e4 LT |
1743 | |
1744 | /* | |
1745 | * "good" settings as per Mt Fuji. | |
1746 | */ | |
ab863ec3 | 1747 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1748 | return 1; |
1da177e4 | 1749 | |
ab863ec3 | 1750 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1751 | return 1; |
1da177e4 | 1752 | |
ab863ec3 | 1753 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1754 | return 1; |
1da177e4 | 1755 | |
fa63c0ab | 1756 | pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1757 | return 0; |
1da177e4 LT |
1758 | } |
1759 | ||
1760 | /* | |
7c613d59 | 1761 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1762 | */ |
7c613d59 | 1763 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1764 | { |
1765 | switch (pd->mmc3_profile) { | |
1766 | case 0x0a: /* CD-RW */ | |
1767 | case 0xffff: /* MMC3 not supported */ | |
1768 | break; | |
1769 | case 0x1a: /* DVD+RW */ | |
1770 | case 0x13: /* DVD-RW */ | |
1771 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1772 | return 1; |
1da177e4 | 1773 | default: |
844aa797 | 1774 | pkt_dbg(2, pd, "Wrong disc profile (%x)\n", |
cd3f2cd0 | 1775 | pd->mmc3_profile); |
7c613d59 | 1776 | return 0; |
1da177e4 LT |
1777 | } |
1778 | ||
1779 | /* | |
1780 | * for disc type 0xff we should probably reserve a new track. | |
1781 | * but i'm not sure, should we leave this to user apps? probably. | |
1782 | */ | |
1783 | if (di->disc_type == 0xff) { | |
ca73dabc | 1784 | pkt_notice(pd, "unknown disc - no track?\n"); |
7c613d59 | 1785 | return 0; |
1da177e4 LT |
1786 | } |
1787 | ||
1788 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
fa63c0ab | 1789 | pkt_err(pd, "wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1790 | return 0; |
1da177e4 LT |
1791 | } |
1792 | ||
1793 | if (di->erasable == 0) { | |
ca73dabc | 1794 | pkt_notice(pd, "disc not erasable\n"); |
7c613d59 | 1795 | return 0; |
1da177e4 LT |
1796 | } |
1797 | ||
1798 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
fa63c0ab | 1799 | pkt_err(pd, "can't write to last track (reserved)\n"); |
7c613d59 | 1800 | return 0; |
1da177e4 LT |
1801 | } |
1802 | ||
7c613d59 | 1803 | return 1; |
1da177e4 LT |
1804 | } |
1805 | ||
05680d86 | 1806 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1807 | { |
1808 | struct packet_command cgc; | |
1809 | unsigned char buf[12]; | |
1810 | disc_information di; | |
1811 | track_information ti; | |
1812 | int ret, track; | |
1813 | ||
1814 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1815 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1816 | cgc.cmd[8] = 8; | |
1817 | ret = pkt_generic_packet(pd, &cgc); | |
1818 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1819 | ||
1820 | memset(&di, 0, sizeof(disc_information)); | |
1821 | memset(&ti, 0, sizeof(track_information)); | |
1822 | ||
1823 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
fa63c0ab | 1824 | pkt_err(pd, "failed get_disc\n"); |
1da177e4 LT |
1825 | return ret; |
1826 | } | |
1827 | ||
7c613d59 | 1828 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1829 | return -EROFS; |
1da177e4 | 1830 | |
1da177e4 LT |
1831 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1832 | ||
1833 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1834 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
fa63c0ab | 1835 | pkt_err(pd, "failed get_track\n"); |
1da177e4 LT |
1836 | return ret; |
1837 | } | |
1838 | ||
ab863ec3 | 1839 | if (!pkt_writable_track(pd, &ti)) { |
fa63c0ab | 1840 | pkt_err(pd, "can't write to this track\n"); |
9db91546 | 1841 | return -EROFS; |
1da177e4 LT |
1842 | } |
1843 | ||
1844 | /* | |
1845 | * we keep packet size in 512 byte units, makes it easier to | |
1846 | * deal with request calculations. | |
1847 | */ | |
1848 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1849 | if (pd->settings.size == 0) { | |
ca73dabc | 1850 | pkt_notice(pd, "detected zero packet size!\n"); |
a460ad62 | 1851 | return -ENXIO; |
1da177e4 | 1852 | } |
d0272e78 | 1853 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
fa63c0ab | 1854 | pkt_err(pd, "packet size is too big\n"); |
9db91546 | 1855 | return -EROFS; |
d0272e78 | 1856 | } |
1da177e4 LT |
1857 | pd->settings.fp = ti.fp; |
1858 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1859 | ||
1860 | if (ti.nwa_v) { | |
1861 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1862 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1863 | } | |
1864 | ||
1865 | /* | |
1866 | * in theory we could use lra on -RW media as well and just zero | |
1867 | * blocks that haven't been written yet, but in practice that | |
1868 | * is just a no-go. we'll use that for -R, naturally. | |
1869 | */ | |
1870 | if (ti.lra_v) { | |
1871 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1872 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1873 | } else { | |
1874 | pd->lra = 0xffffffff; | |
1875 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1876 | } | |
1877 | ||
1878 | /* | |
1879 | * fine for now | |
1880 | */ | |
1881 | pd->settings.link_loss = 7; | |
1882 | pd->settings.write_type = 0; /* packet */ | |
1883 | pd->settings.track_mode = ti.track_mode; | |
1884 | ||
1885 | /* | |
1886 | * mode1 or mode2 disc | |
1887 | */ | |
1888 | switch (ti.data_mode) { | |
1889 | case PACKET_MODE1: | |
1890 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1891 | break; | |
1892 | case PACKET_MODE2: | |
1893 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1894 | break; | |
1895 | default: | |
fa63c0ab | 1896 | pkt_err(pd, "unknown data mode\n"); |
9db91546 | 1897 | return -EROFS; |
1da177e4 LT |
1898 | } |
1899 | return 0; | |
1900 | } | |
1901 | ||
1902 | /* | |
1903 | * enable/disable write caching on drive | |
1904 | */ | |
05680d86 PO |
1905 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
1906 | int set) | |
1da177e4 LT |
1907 | { |
1908 | struct packet_command cgc; | |
1909 | struct request_sense sense; | |
1910 | unsigned char buf[64]; | |
1911 | int ret; | |
1912 | ||
1da177e4 LT |
1913 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
1914 | cgc.sense = &sense; | |
1915 | cgc.buflen = pd->mode_offset + 12; | |
1916 | ||
1917 | /* | |
1918 | * caching mode page might not be there, so quiet this command | |
1919 | */ | |
1920 | cgc.quiet = 1; | |
1921 | ||
1922 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
1923 | return ret; | |
1924 | ||
1925 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
1926 | ||
1927 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
1928 | ret = pkt_mode_select(pd, &cgc); | |
1929 | if (ret) { | |
fa63c0ab | 1930 | pkt_err(pd, "write caching control failed\n"); |
f3ded788 | 1931 | pkt_dump_sense(pd, &cgc); |
1da177e4 | 1932 | } else if (!ret && set) |
ca73dabc | 1933 | pkt_notice(pd, "enabled write caching\n"); |
1da177e4 LT |
1934 | return ret; |
1935 | } | |
1936 | ||
1937 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1938 | { | |
1939 | struct packet_command cgc; | |
1940 | ||
1941 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1942 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1943 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1944 | return pkt_generic_packet(pd, &cgc); | |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * Returns drive maximum write speed | |
1949 | */ | |
05680d86 PO |
1950 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
1951 | unsigned *write_speed) | |
1da177e4 LT |
1952 | { |
1953 | struct packet_command cgc; | |
1954 | struct request_sense sense; | |
1955 | unsigned char buf[256+18]; | |
1956 | unsigned char *cap_buf; | |
1957 | int ret, offset; | |
1958 | ||
1da177e4 LT |
1959 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
1960 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
1961 | cgc.sense = &sense; | |
1962 | ||
1963 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1964 | if (ret) { | |
1965 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
1966 | sizeof(struct mode_page_header); | |
1967 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
1968 | if (ret) { | |
f3ded788 | 1969 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
1970 | return ret; |
1971 | } | |
1972 | } | |
1973 | ||
1974 | offset = 20; /* Obsoleted field, used by older drives */ | |
1975 | if (cap_buf[1] >= 28) | |
1976 | offset = 28; /* Current write speed selected */ | |
1977 | if (cap_buf[1] >= 30) { | |
1978 | /* If the drive reports at least one "Logical Unit Write | |
1979 | * Speed Performance Descriptor Block", use the information | |
1980 | * in the first block. (contains the highest speed) | |
1981 | */ | |
1982 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
1983 | if (num_spdb > 0) | |
1984 | offset = 34; | |
1985 | } | |
1986 | ||
1987 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
1988 | return 0; | |
1989 | } | |
1990 | ||
1991 | /* These tables from cdrecord - I don't have orange book */ | |
1992 | /* standard speed CD-RW (1-4x) */ | |
1993 | static char 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, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
1996 | }; | |
1997 | /* high speed CD-RW (-10x) */ | |
1998 | static char hs_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, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2001 | }; | |
2002 | /* ultra high speed CD-RW */ | |
2003 | static char us_clv_to_speed[16] = { | |
2004 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2005 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2006 | }; | |
2007 | ||
2008 | /* | |
2009 | * reads the maximum media speed from ATIP | |
2010 | */ | |
05680d86 PO |
2011 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
2012 | unsigned *speed) | |
1da177e4 LT |
2013 | { |
2014 | struct packet_command cgc; | |
2015 | struct request_sense sense; | |
2016 | unsigned char buf[64]; | |
2017 | unsigned int size, st, sp; | |
2018 | int ret; | |
2019 | ||
2020 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2021 | cgc.sense = &sense; | |
2022 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2023 | cgc.cmd[1] = 2; | |
2024 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2025 | cgc.cmd[8] = 2; | |
2026 | ret = pkt_generic_packet(pd, &cgc); | |
2027 | if (ret) { | |
f3ded788 | 2028 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2029 | return ret; |
2030 | } | |
2031 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2032 | if (size > sizeof(buf)) | |
2033 | size = sizeof(buf); | |
2034 | ||
2035 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2036 | cgc.sense = &sense; | |
2037 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2038 | cgc.cmd[1] = 2; | |
2039 | cgc.cmd[2] = 4; | |
2040 | cgc.cmd[8] = size; | |
2041 | ret = pkt_generic_packet(pd, &cgc); | |
2042 | if (ret) { | |
f3ded788 | 2043 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2044 | return ret; |
2045 | } | |
2046 | ||
eaa0ff15 | 2047 | if (!(buf[6] & 0x40)) { |
ca73dabc | 2048 | pkt_notice(pd, "disc type is not CD-RW\n"); |
1da177e4 LT |
2049 | return 1; |
2050 | } | |
eaa0ff15 | 2051 | if (!(buf[6] & 0x4)) { |
ca73dabc | 2052 | pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2053 | return 1; |
2054 | } | |
2055 | ||
2056 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2057 | ||
2058 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2059 | ||
2060 | /* Info from cdrecord */ | |
2061 | switch (st) { | |
2062 | case 0: /* standard speed */ | |
2063 | *speed = clv_to_speed[sp]; | |
2064 | break; | |
2065 | case 1: /* high speed */ | |
2066 | *speed = hs_clv_to_speed[sp]; | |
2067 | break; | |
2068 | case 2: /* ultra high speed */ | |
2069 | *speed = us_clv_to_speed[sp]; | |
2070 | break; | |
2071 | default: | |
ca73dabc | 2072 | pkt_notice(pd, "unknown disc sub-type %d\n", st); |
1da177e4 LT |
2073 | return 1; |
2074 | } | |
2075 | if (*speed) { | |
0c075d64 | 2076 | pkt_info(pd, "maximum media speed: %d\n", *speed); |
1da177e4 LT |
2077 | return 0; |
2078 | } else { | |
ca73dabc | 2079 | pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st); |
1da177e4 LT |
2080 | return 1; |
2081 | } | |
2082 | } | |
2083 | ||
05680d86 | 2084 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
1da177e4 LT |
2085 | { |
2086 | struct packet_command cgc; | |
2087 | struct request_sense sense; | |
2088 | int ret; | |
2089 | ||
844aa797 | 2090 | pkt_dbg(2, pd, "Performing OPC\n"); |
1da177e4 LT |
2091 | |
2092 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2093 | cgc.sense = &sense; | |
2094 | cgc.timeout = 60*HZ; | |
2095 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2096 | cgc.cmd[1] = 1; | |
2097 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
f3ded788 | 2098 | pkt_dump_sense(pd, &cgc); |
1da177e4 LT |
2099 | return ret; |
2100 | } | |
2101 | ||
2102 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2103 | { | |
2104 | int ret; | |
2105 | unsigned int write_speed, media_write_speed, read_speed; | |
2106 | ||
2107 | if ((ret = pkt_probe_settings(pd))) { | |
844aa797 | 2108 | pkt_dbg(2, pd, "failed probe\n"); |
9db91546 | 2109 | return ret; |
1da177e4 LT |
2110 | } |
2111 | ||
2112 | if ((ret = pkt_set_write_settings(pd))) { | |
844aa797 | 2113 | pkt_dbg(1, pd, "failed saving write settings\n"); |
1da177e4 LT |
2114 | return -EIO; |
2115 | } | |
2116 | ||
2117 | pkt_write_caching(pd, USE_WCACHING); | |
2118 | ||
2119 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2120 | write_speed = 16 * 177; | |
2121 | switch (pd->mmc3_profile) { | |
2122 | case 0x13: /* DVD-RW */ | |
2123 | case 0x1a: /* DVD+RW */ | |
2124 | case 0x12: /* DVD-RAM */ | |
844aa797 | 2125 | pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2126 | break; |
2127 | default: | |
2128 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2129 | media_write_speed = 16; | |
2130 | write_speed = min(write_speed, media_write_speed * 177); | |
844aa797 | 2131 | pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2132 | break; |
2133 | } | |
2134 | read_speed = write_speed; | |
2135 | ||
2136 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
844aa797 | 2137 | pkt_dbg(1, pd, "couldn't set write speed\n"); |
1da177e4 LT |
2138 | return -EIO; |
2139 | } | |
2140 | pd->write_speed = write_speed; | |
2141 | pd->read_speed = read_speed; | |
2142 | ||
2143 | if ((ret = pkt_perform_opc(pd))) { | |
844aa797 | 2144 | pkt_dbg(1, pd, "Optimum Power Calibration failed\n"); |
1da177e4 LT |
2145 | } |
2146 | ||
2147 | return 0; | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * called at open time. | |
2152 | */ | |
aeb5d727 | 2153 | static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
1da177e4 LT |
2154 | { |
2155 | int ret; | |
2156 | long lba; | |
165125e1 | 2157 | struct request_queue *q; |
1da177e4 LT |
2158 | |
2159 | /* | |
2160 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2161 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2162 | * so bdget() can't fail. | |
2163 | */ | |
2164 | bdget(pd->bdev->bd_dev); | |
e525fd89 | 2165 | if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd))) |
1da177e4 LT |
2166 | goto out; |
2167 | ||
2168 | if ((ret = pkt_get_last_written(pd, &lba))) { | |
fa63c0ab | 2169 | pkt_err(pd, "pkt_get_last_written failed\n"); |
e525fd89 | 2170 | goto out_putdev; |
1da177e4 LT |
2171 | } |
2172 | ||
2173 | set_capacity(pd->disk, lba << 2); | |
2174 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2175 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2176 | ||
2177 | q = bdev_get_queue(pd->bdev); | |
2178 | if (write) { | |
2179 | if ((ret = pkt_open_write(pd))) | |
e525fd89 | 2180 | goto out_putdev; |
1da177e4 LT |
2181 | /* |
2182 | * Some CDRW drives can not handle writes larger than one packet, | |
2183 | * even if the size is a multiple of the packet size. | |
2184 | */ | |
2185 | spin_lock_irq(q->queue_lock); | |
086fa5ff | 2186 | blk_queue_max_hw_sectors(q, pd->settings.size); |
1da177e4 LT |
2187 | spin_unlock_irq(q->queue_lock); |
2188 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2189 | } else { | |
2190 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2191 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2192 | } | |
2193 | ||
2194 | if ((ret = pkt_set_segment_merging(pd, q))) | |
e525fd89 | 2195 | goto out_putdev; |
1da177e4 | 2196 | |
e1bc89bc PO |
2197 | if (write) { |
2198 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
fa63c0ab | 2199 | pkt_err(pd, "not enough memory for buffers\n"); |
e1bc89bc | 2200 | ret = -ENOMEM; |
e525fd89 | 2201 | goto out_putdev; |
e1bc89bc | 2202 | } |
0c075d64 | 2203 | pkt_info(pd, "%lukB available on disc\n", lba << 1); |
e1bc89bc | 2204 | } |
1da177e4 LT |
2205 | |
2206 | return 0; | |
2207 | ||
2208 | out_putdev: | |
e525fd89 | 2209 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
1da177e4 LT |
2210 | out: |
2211 | return ret; | |
2212 | } | |
2213 | ||
2214 | /* | |
2215 | * called when the device is closed. makes sure that the device flushes | |
2216 | * the internal cache before we close. | |
2217 | */ | |
2218 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2219 | { | |
2220 | if (flush && pkt_flush_cache(pd)) | |
844aa797 | 2221 | pkt_dbg(1, pd, "not flushing cache\n"); |
1da177e4 LT |
2222 | |
2223 | pkt_lock_door(pd, 0); | |
2224 | ||
2225 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
e525fd89 | 2226 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
e1bc89bc PO |
2227 | |
2228 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2229 | } |
2230 | ||
252a52aa | 2231 | static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor) |
1da177e4 LT |
2232 | { |
2233 | if (dev_minor >= MAX_WRITERS) | |
2234 | return NULL; | |
2235 | return pkt_devs[dev_minor]; | |
2236 | } | |
2237 | ||
5e5e007c | 2238 | static int pkt_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
2239 | { |
2240 | struct pktcdvd_device *pd = NULL; | |
2241 | int ret; | |
2242 | ||
2a48fc0a | 2243 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2244 | mutex_lock(&ctl_mutex); |
5e5e007c | 2245 | pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
1da177e4 LT |
2246 | if (!pd) { |
2247 | ret = -ENODEV; | |
2248 | goto out; | |
2249 | } | |
2250 | BUG_ON(pd->refcnt < 0); | |
2251 | ||
2252 | pd->refcnt++; | |
46f4e1b7 | 2253 | if (pd->refcnt > 1) { |
5e5e007c | 2254 | if ((mode & FMODE_WRITE) && |
46f4e1b7 PO |
2255 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2256 | ret = -EBUSY; | |
2257 | goto out_dec; | |
2258 | } | |
2259 | } else { | |
5e5e007c | 2260 | ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
01fd9fda | 2261 | if (ret) |
1da177e4 | 2262 | goto out_dec; |
1da177e4 LT |
2263 | /* |
2264 | * needed here as well, since ext2 (among others) may change | |
2265 | * the blocksize at mount time | |
2266 | */ | |
5e5e007c | 2267 | set_blocksize(bdev, CD_FRAMESIZE); |
1da177e4 LT |
2268 | } |
2269 | ||
1657f824 | 2270 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2271 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2272 | return 0; |
2273 | ||
2274 | out_dec: | |
2275 | pd->refcnt--; | |
2276 | out: | |
1657f824 | 2277 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2278 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2279 | return ret; |
2280 | } | |
2281 | ||
db2a144b | 2282 | static void pkt_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2283 | { |
5e5e007c | 2284 | struct pktcdvd_device *pd = disk->private_data; |
1da177e4 | 2285 | |
2a48fc0a | 2286 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2287 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2288 | pd->refcnt--; |
2289 | BUG_ON(pd->refcnt < 0); | |
2290 | if (pd->refcnt == 0) { | |
2291 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2292 | pkt_release_dev(pd, flush); | |
2293 | } | |
1657f824 | 2294 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2295 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2296 | } |
2297 | ||
2298 | ||
4246a0b6 | 2299 | static void pkt_end_io_read_cloned(struct bio *bio) |
1da177e4 LT |
2300 | { |
2301 | struct packet_stacked_data *psd = bio->bi_private; | |
2302 | struct pktcdvd_device *pd = psd->pd; | |
2303 | ||
4246a0b6 | 2304 | psd->bio->bi_error = bio->bi_error; |
1da177e4 | 2305 | bio_put(bio); |
4246a0b6 | 2306 | bio_endio(psd->bio); |
1da177e4 LT |
2307 | mempool_free(psd, psd_pool); |
2308 | pkt_bio_finished(pd); | |
1da177e4 LT |
2309 | } |
2310 | ||
20d0189b | 2311 | static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 | 2312 | { |
20d0189b KO |
2313 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); |
2314 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2315 | ||
2316 | psd->pd = pd; | |
2317 | psd->bio = bio; | |
2318 | cloned_bio->bi_bdev = pd->bdev; | |
2319 | cloned_bio->bi_private = psd; | |
2320 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2321 | pd->stats.secs_r += bio_sectors(bio); | |
2322 | pkt_queue_bio(pd, cloned_bio); | |
2323 | } | |
2324 | ||
2325 | static void pkt_make_request_write(struct request_queue *q, struct bio *bio) | |
2326 | { | |
2327 | struct pktcdvd_device *pd = q->queuedata; | |
1da177e4 LT |
2328 | sector_t zone; |
2329 | struct packet_data *pkt; | |
2330 | int was_empty, blocked_bio; | |
2331 | struct pkt_rb_node *node; | |
2332 | ||
4f024f37 | 2333 | zone = get_zone(bio->bi_iter.bi_sector, pd); |
1da177e4 LT |
2334 | |
2335 | /* | |
2336 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2337 | * just append this bio to that packet. | |
2338 | */ | |
2339 | spin_lock(&pd->cdrw.active_list_lock); | |
2340 | blocked_bio = 0; | |
2341 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2342 | if (pkt->sector == zone) { | |
2343 | spin_lock(&pkt->lock); | |
2344 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2345 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
c5ecc484 | 2346 | bio_list_add(&pkt->orig_bios, bio); |
4f024f37 KO |
2347 | pkt->write_size += |
2348 | bio->bi_iter.bi_size / CD_FRAMESIZE; | |
1da177e4 LT |
2349 | if ((pkt->write_size >= pkt->frames) && |
2350 | (pkt->state == PACKET_WAITING_STATE)) { | |
2351 | atomic_inc(&pkt->run_sm); | |
2352 | wake_up(&pd->wqueue); | |
2353 | } | |
2354 | spin_unlock(&pkt->lock); | |
2355 | spin_unlock(&pd->cdrw.active_list_lock); | |
5a7bbad2 | 2356 | return; |
1da177e4 LT |
2357 | } else { |
2358 | blocked_bio = 1; | |
2359 | } | |
2360 | spin_unlock(&pkt->lock); | |
2361 | } | |
2362 | } | |
2363 | spin_unlock(&pd->cdrw.active_list_lock); | |
2364 | ||
0a0fc960 TM |
2365 | /* |
2366 | * Test if there is enough room left in the bio work queue | |
2367 | * (queue size >= congestion on mark). | |
2368 | * If not, wait till the work queue size is below the congestion off mark. | |
2369 | */ | |
2370 | spin_lock(&pd->lock); | |
2371 | if (pd->write_congestion_on > 0 | |
2372 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
dc3b17cc | 2373 | set_bdi_congested(q->backing_dev_info, BLK_RW_ASYNC); |
0a0fc960 TM |
2374 | do { |
2375 | spin_unlock(&pd->lock); | |
8aa7e847 | 2376 | congestion_wait(BLK_RW_ASYNC, HZ); |
0a0fc960 TM |
2377 | spin_lock(&pd->lock); |
2378 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2379 | } | |
2380 | spin_unlock(&pd->lock); | |
2381 | ||
1da177e4 LT |
2382 | /* |
2383 | * No matching packet found. Store the bio in the work queue. | |
2384 | */ | |
2385 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2386 | node->bio = bio; |
2387 | spin_lock(&pd->lock); | |
2388 | BUG_ON(pd->bio_queue_size < 0); | |
2389 | was_empty = (pd->bio_queue_size == 0); | |
2390 | pkt_rbtree_insert(pd, node); | |
2391 | spin_unlock(&pd->lock); | |
2392 | ||
2393 | /* | |
2394 | * Wake up the worker thread. | |
2395 | */ | |
2396 | atomic_set(&pd->scan_queue, 1); | |
2397 | if (was_empty) { | |
2398 | /* This wake_up is required for correct operation */ | |
2399 | wake_up(&pd->wqueue); | |
2400 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2401 | /* | |
2402 | * This wake up is not required for correct operation, | |
2403 | * but improves performance in some cases. | |
2404 | */ | |
2405 | wake_up(&pd->wqueue); | |
2406 | } | |
20d0189b KO |
2407 | } |
2408 | ||
dece1635 | 2409 | static blk_qc_t pkt_make_request(struct request_queue *q, struct bio *bio) |
20d0189b KO |
2410 | { |
2411 | struct pktcdvd_device *pd; | |
2412 | char b[BDEVNAME_SIZE]; | |
2413 | struct bio *split; | |
2414 | ||
54efd50b KO |
2415 | blk_queue_bounce(q, &bio); |
2416 | ||
2417 | blk_queue_split(q, &bio, q->bio_split); | |
2418 | ||
20d0189b KO |
2419 | pd = q->queuedata; |
2420 | if (!pd) { | |
2421 | pr_err("%s incorrect request queue\n", | |
2422 | bdevname(bio->bi_bdev, b)); | |
2423 | goto end_io; | |
2424 | } | |
2425 | ||
2426 | pkt_dbg(2, pd, "start = %6llx stop = %6llx\n", | |
2427 | (unsigned long long)bio->bi_iter.bi_sector, | |
2428 | (unsigned long long)bio_end_sector(bio)); | |
2429 | ||
2430 | /* | |
2431 | * Clone READ bios so we can have our own bi_end_io callback. | |
2432 | */ | |
2433 | if (bio_data_dir(bio) == READ) { | |
2434 | pkt_make_request_read(pd, bio); | |
dece1635 | 2435 | return BLK_QC_T_NONE; |
20d0189b KO |
2436 | } |
2437 | ||
2438 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2439 | pkt_notice(pd, "WRITE for ro device (%llu)\n", | |
2440 | (unsigned long long)bio->bi_iter.bi_sector); | |
2441 | goto end_io; | |
2442 | } | |
2443 | ||
2444 | if (!bio->bi_iter.bi_size || (bio->bi_iter.bi_size % CD_FRAMESIZE)) { | |
2445 | pkt_err(pd, "wrong bio size\n"); | |
2446 | goto end_io; | |
2447 | } | |
2448 | ||
20d0189b KO |
2449 | do { |
2450 | sector_t zone = get_zone(bio->bi_iter.bi_sector, pd); | |
2451 | sector_t last_zone = get_zone(bio_end_sector(bio) - 1, pd); | |
2452 | ||
2453 | if (last_zone != zone) { | |
2454 | BUG_ON(last_zone != zone + pd->settings.size); | |
2455 | ||
2456 | split = bio_split(bio, last_zone - | |
2457 | bio->bi_iter.bi_sector, | |
2458 | GFP_NOIO, fs_bio_set); | |
2459 | bio_chain(split, bio); | |
2460 | } else { | |
2461 | split = bio; | |
2462 | } | |
2463 | ||
2464 | pkt_make_request_write(q, split); | |
2465 | } while (split != bio); | |
2466 | ||
dece1635 | 2467 | return BLK_QC_T_NONE; |
1da177e4 | 2468 | end_io: |
6712ecf8 | 2469 | bio_io_error(bio); |
dece1635 | 2470 | return BLK_QC_T_NONE; |
1da177e4 LT |
2471 | } |
2472 | ||
1da177e4 LT |
2473 | static void pkt_init_queue(struct pktcdvd_device *pd) |
2474 | { | |
165125e1 | 2475 | struct request_queue *q = pd->disk->queue; |
1da177e4 LT |
2476 | |
2477 | blk_queue_make_request(q, pkt_make_request); | |
e1defc4f | 2478 | blk_queue_logical_block_size(q, CD_FRAMESIZE); |
086fa5ff | 2479 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); |
1da177e4 LT |
2480 | q->queuedata = pd; |
2481 | } | |
2482 | ||
2483 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2484 | { | |
2485 | struct pktcdvd_device *pd = m->private; | |
2486 | char *msg; | |
2487 | char bdev_buf[BDEVNAME_SIZE]; | |
2488 | int states[PACKET_NUM_STATES]; | |
2489 | ||
2490 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2491 | bdevname(pd->bdev, bdev_buf)); | |
2492 | ||
2493 | seq_printf(m, "\nSettings:\n"); | |
2494 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2495 | ||
2496 | if (pd->settings.write_type == 0) | |
2497 | msg = "Packet"; | |
2498 | else | |
2499 | msg = "Unknown"; | |
2500 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2501 | ||
2502 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2503 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2504 | ||
2505 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2506 | ||
2507 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2508 | msg = "Mode 1"; | |
2509 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2510 | msg = "Mode 2"; | |
2511 | else | |
2512 | msg = "Unknown"; | |
2513 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2514 | ||
2515 | seq_printf(m, "\nStatistics:\n"); | |
2516 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2517 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2518 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2519 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2520 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2521 | ||
2522 | seq_printf(m, "\nMisc:\n"); | |
2523 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2524 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2525 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2526 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2527 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2528 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2529 | ||
2530 | seq_printf(m, "\nQueue state:\n"); | |
2531 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2532 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2533 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2534 | ||
2535 | pkt_count_states(pd, states); | |
2536 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2537 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2538 | ||
0a0fc960 TM |
2539 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2540 | pd->write_congestion_off, | |
2541 | pd->write_congestion_on); | |
1da177e4 LT |
2542 | return 0; |
2543 | } | |
2544 | ||
2545 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2546 | { | |
d9dda78b | 2547 | return single_open(file, pkt_seq_show, PDE_DATA(inode)); |
1da177e4 LT |
2548 | } |
2549 | ||
2b8693c0 | 2550 | static const struct file_operations pkt_proc_fops = { |
1da177e4 LT |
2551 | .open = pkt_seq_open, |
2552 | .read = seq_read, | |
2553 | .llseek = seq_lseek, | |
2554 | .release = single_release | |
2555 | }; | |
2556 | ||
2557 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2558 | { | |
2559 | int i; | |
2560 | int ret = 0; | |
2561 | char b[BDEVNAME_SIZE]; | |
1da177e4 LT |
2562 | struct block_device *bdev; |
2563 | ||
2564 | if (pd->pkt_dev == dev) { | |
fa63c0ab | 2565 | pkt_err(pd, "recursive setup not allowed\n"); |
1da177e4 LT |
2566 | return -EBUSY; |
2567 | } | |
2568 | for (i = 0; i < MAX_WRITERS; i++) { | |
2569 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2570 | if (!pd2) | |
2571 | continue; | |
2572 | if (pd2->bdev->bd_dev == dev) { | |
fa63c0ab JP |
2573 | pkt_err(pd, "%s already setup\n", |
2574 | bdevname(pd2->bdev, b)); | |
1da177e4 LT |
2575 | return -EBUSY; |
2576 | } | |
2577 | if (pd2->pkt_dev == dev) { | |
fa63c0ab | 2578 | pkt_err(pd, "can't chain pktcdvd devices\n"); |
1da177e4 LT |
2579 | return -EBUSY; |
2580 | } | |
2581 | } | |
2582 | ||
2583 | bdev = bdget(dev); | |
2584 | if (!bdev) | |
2585 | return -ENOMEM; | |
e525fd89 | 2586 | ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL); |
1da177e4 LT |
2587 | if (ret) |
2588 | return ret; | |
2589 | ||
2590 | /* This is safe, since we have a reference from open(). */ | |
2591 | __module_get(THIS_MODULE); | |
2592 | ||
1da177e4 LT |
2593 | pd->bdev = bdev; |
2594 | set_blocksize(bdev, CD_FRAMESIZE); | |
2595 | ||
2596 | pkt_init_queue(pd); | |
2597 | ||
2598 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2599 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2600 | if (IS_ERR(pd->cdrw.thread)) { | |
fa63c0ab | 2601 | pkt_err(pd, "can't start kernel thread\n"); |
1da177e4 | 2602 | ret = -ENOMEM; |
e1bc89bc | 2603 | goto out_mem; |
1da177e4 LT |
2604 | } |
2605 | ||
c7705f34 | 2606 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
844aa797 | 2607 | pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b)); |
1da177e4 LT |
2608 | return 0; |
2609 | ||
1da177e4 | 2610 | out_mem: |
2cbed890 | 2611 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 LT |
2612 | /* This is safe: open() is still holding a reference. */ |
2613 | module_put(THIS_MODULE); | |
2614 | return ret; | |
2615 | } | |
2616 | ||
5e5e007c | 2617 | static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
1da177e4 | 2618 | { |
5e5e007c | 2619 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
8a6cfeb6 | 2620 | int ret; |
1da177e4 | 2621 | |
844aa797 | 2622 | pkt_dbg(2, pd, "cmd %x, dev %d:%d\n", |
cd3f2cd0 | 2623 | cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); |
1da177e4 | 2624 | |
2a48fc0a | 2625 | mutex_lock(&pktcdvd_mutex); |
1da177e4 | 2626 | switch (cmd) { |
a0eb62a0 AV |
2627 | case CDROMEJECT: |
2628 | /* | |
2629 | * The door gets locked when the device is opened, so we | |
2630 | * have to unlock it or else the eject command fails. | |
2631 | */ | |
2632 | if (pd->refcnt == 1) | |
2633 | pkt_lock_door(pd, 0); | |
2634 | /* fallthru */ | |
1da177e4 LT |
2635 | /* |
2636 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2637 | */ | |
2638 | case CDROMMULTISESSION: | |
2639 | case CDROMREADTOCENTRY: | |
2640 | case CDROM_LAST_WRITTEN: | |
2641 | case CDROM_SEND_PACKET: | |
2642 | case SCSI_IOCTL_SEND_COMMAND: | |
8a6cfeb6 AB |
2643 | ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg); |
2644 | break; | |
1da177e4 LT |
2645 | |
2646 | default: | |
844aa797 | 2647 | pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd); |
8a6cfeb6 | 2648 | ret = -ENOTTY; |
1da177e4 | 2649 | } |
2a48fc0a | 2650 | mutex_unlock(&pktcdvd_mutex); |
8560c650 | 2651 | |
8a6cfeb6 | 2652 | return ret; |
1da177e4 LT |
2653 | } |
2654 | ||
3c0d2060 TH |
2655 | static unsigned int pkt_check_events(struct gendisk *disk, |
2656 | unsigned int clearing) | |
1da177e4 LT |
2657 | { |
2658 | struct pktcdvd_device *pd = disk->private_data; | |
2659 | struct gendisk *attached_disk; | |
2660 | ||
2661 | if (!pd) | |
2662 | return 0; | |
2663 | if (!pd->bdev) | |
2664 | return 0; | |
2665 | attached_disk = pd->bdev->bd_disk; | |
3c0d2060 | 2666 | if (!attached_disk || !attached_disk->fops->check_events) |
1da177e4 | 2667 | return 0; |
3c0d2060 | 2668 | return attached_disk->fops->check_events(attached_disk, clearing); |
1da177e4 LT |
2669 | } |
2670 | ||
83d5cde4 | 2671 | static const struct block_device_operations pktcdvd_ops = { |
1da177e4 | 2672 | .owner = THIS_MODULE, |
5e5e007c AV |
2673 | .open = pkt_open, |
2674 | .release = pkt_close, | |
8a6cfeb6 | 2675 | .ioctl = pkt_ioctl, |
3c0d2060 | 2676 | .check_events = pkt_check_events, |
1da177e4 LT |
2677 | }; |
2678 | ||
2c9ede55 | 2679 | static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode) |
b03f38b6 KS |
2680 | { |
2681 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); | |
2682 | } | |
2683 | ||
1da177e4 LT |
2684 | /* |
2685 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2686 | */ | |
adb9250a | 2687 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2688 | { |
2689 | int idx; | |
2690 | int ret = -ENOMEM; | |
2691 | struct pktcdvd_device *pd; | |
2692 | struct gendisk *disk; | |
adb9250a TM |
2693 | |
2694 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2695 | |
2696 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2697 | if (!pkt_devs[idx]) | |
2698 | break; | |
2699 | if (idx == MAX_WRITERS) { | |
99481334 | 2700 | pr_err("max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2701 | ret = -EBUSY; |
2702 | goto out_mutex; | |
1da177e4 LT |
2703 | } |
2704 | ||
1107d2e0 | 2705 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2706 | if (!pd) |
adb9250a | 2707 | goto out_mutex; |
1da177e4 | 2708 | |
0eaae62a MD |
2709 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2710 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2711 | if (!pd->rb_pool) |
2712 | goto out_mem; | |
2713 | ||
e1bc89bc PO |
2714 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2715 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2716 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2717 | ||
1da177e4 LT |
2718 | spin_lock_init(&pd->lock); |
2719 | spin_lock_init(&pd->iosched.lock); | |
c5ecc484 AM |
2720 | bio_list_init(&pd->iosched.read_queue); |
2721 | bio_list_init(&pd->iosched.write_queue); | |
7822082d | 2722 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2723 | init_waitqueue_head(&pd->wqueue); |
2724 | pd->bio_queue = RB_ROOT; | |
2725 | ||
0a0fc960 TM |
2726 | pd->write_congestion_on = write_congestion_on; |
2727 | pd->write_congestion_off = write_congestion_off; | |
2728 | ||
adb9250a TM |
2729 | disk = alloc_disk(1); |
2730 | if (!disk) | |
2731 | goto out_mem; | |
2732 | pd->disk = disk; | |
add21660 | 2733 | disk->major = pktdev_major; |
1da177e4 LT |
2734 | disk->first_minor = idx; |
2735 | disk->fops = &pktcdvd_ops; | |
2736 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2737 | strcpy(disk->disk_name, pd->name); |
e454cea2 | 2738 | disk->devnode = pktcdvd_devnode; |
1da177e4 LT |
2739 | disk->private_data = pd; |
2740 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2741 | if (!disk->queue) | |
2742 | goto out_mem2; | |
2743 | ||
f331c029 | 2744 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
1da177e4 LT |
2745 | ret = pkt_new_dev(pd, dev); |
2746 | if (ret) | |
2747 | goto out_new_dev; | |
2748 | ||
3c0d2060 TH |
2749 | /* inherit events of the host device */ |
2750 | disk->events = pd->bdev->bd_disk->events; | |
2751 | disk->async_events = pd->bdev->bd_disk->async_events; | |
2752 | ||
1da177e4 | 2753 | add_disk(disk); |
adb9250a | 2754 | |
32694850 TM |
2755 | pkt_sysfs_dev_new(pd); |
2756 | pkt_debugfs_dev_new(pd); | |
2757 | ||
1da177e4 | 2758 | pkt_devs[idx] = pd; |
adb9250a TM |
2759 | if (pkt_dev) |
2760 | *pkt_dev = pd->pkt_dev; | |
2761 | ||
2762 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2763 | return 0; |
2764 | ||
2765 | out_new_dev: | |
1312f40e | 2766 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2767 | out_mem2: |
2768 | put_disk(disk); | |
2769 | out_mem: | |
0220531a | 2770 | mempool_destroy(pd->rb_pool); |
1da177e4 | 2771 | kfree(pd); |
adb9250a TM |
2772 | out_mutex: |
2773 | mutex_unlock(&ctl_mutex); | |
99481334 | 2774 | pr_err("setup of pktcdvd device failed\n"); |
1da177e4 LT |
2775 | return ret; |
2776 | } | |
2777 | ||
2778 | /* | |
2779 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2780 | */ | |
adb9250a | 2781 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2782 | { |
2783 | struct pktcdvd_device *pd; | |
2784 | int idx; | |
adb9250a TM |
2785 | int ret = 0; |
2786 | ||
2787 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2788 | |
2789 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2790 | pd = pkt_devs[idx]; | |
2791 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2792 | break; | |
2793 | } | |
2794 | if (idx == MAX_WRITERS) { | |
666dc7c9 | 2795 | pr_debug("dev not setup\n"); |
adb9250a TM |
2796 | ret = -ENXIO; |
2797 | goto out; | |
1da177e4 LT |
2798 | } |
2799 | ||
adb9250a TM |
2800 | if (pd->refcnt > 0) { |
2801 | ret = -EBUSY; | |
2802 | goto out; | |
2803 | } | |
1da177e4 LT |
2804 | if (!IS_ERR(pd->cdrw.thread)) |
2805 | kthread_stop(pd->cdrw.thread); | |
2806 | ||
32694850 TM |
2807 | pkt_devs[idx] = NULL; |
2808 | ||
2809 | pkt_debugfs_dev_remove(pd); | |
2810 | pkt_sysfs_dev_remove(pd); | |
2811 | ||
2cbed890 | 2812 | blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 | 2813 | |
1da177e4 | 2814 | remove_proc_entry(pd->name, pkt_proc); |
844aa797 | 2815 | pkt_dbg(1, pd, "writer unmapped\n"); |
1da177e4 LT |
2816 | |
2817 | del_gendisk(pd->disk); | |
1312f40e | 2818 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2819 | put_disk(pd->disk); |
2820 | ||
1da177e4 LT |
2821 | mempool_destroy(pd->rb_pool); |
2822 | kfree(pd); | |
2823 | ||
2824 | /* This is safe: open() is still holding a reference. */ | |
2825 | module_put(THIS_MODULE); | |
adb9250a TM |
2826 | |
2827 | out: | |
2828 | mutex_unlock(&ctl_mutex); | |
2829 | return ret; | |
1da177e4 LT |
2830 | } |
2831 | ||
2832 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2833 | { | |
adb9250a TM |
2834 | struct pktcdvd_device *pd; |
2835 | ||
2836 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2837 | ||
2838 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
2839 | if (pd) { |
2840 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2841 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2842 | } else { | |
2843 | ctrl_cmd->dev = 0; | |
2844 | ctrl_cmd->pkt_dev = 0; | |
2845 | } | |
2846 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
2847 | |
2848 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2849 | } |
2850 | ||
f80a0ca6 | 2851 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
2852 | { |
2853 | void __user *argp = (void __user *)arg; | |
2854 | struct pkt_ctrl_command ctrl_cmd; | |
2855 | int ret = 0; | |
adb9250a | 2856 | dev_t pkt_dev = 0; |
1da177e4 LT |
2857 | |
2858 | if (cmd != PACKET_CTRL_CMD) | |
2859 | return -ENOTTY; | |
2860 | ||
2861 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2862 | return -EFAULT; | |
2863 | ||
2864 | switch (ctrl_cmd.command) { | |
2865 | case PKT_CTRL_CMD_SETUP: | |
2866 | if (!capable(CAP_SYS_ADMIN)) | |
2867 | return -EPERM; | |
adb9250a TM |
2868 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
2869 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
2870 | break; |
2871 | case PKT_CTRL_CMD_TEARDOWN: | |
2872 | if (!capable(CAP_SYS_ADMIN)) | |
2873 | return -EPERM; | |
adb9250a | 2874 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
2875 | break; |
2876 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 2877 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
2878 | break; |
2879 | default: | |
2880 | return -ENOTTY; | |
2881 | } | |
2882 | ||
2883 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2884 | return -EFAULT; | |
2885 | return ret; | |
2886 | } | |
2887 | ||
f80a0ca6 AB |
2888 | #ifdef CONFIG_COMPAT |
2889 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2890 | { | |
2891 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
2892 | } | |
2893 | #endif | |
1da177e4 | 2894 | |
2b8693c0 | 2895 | static const struct file_operations pkt_ctl_fops = { |
f80a0ca6 AB |
2896 | .open = nonseekable_open, |
2897 | .unlocked_ioctl = pkt_ctl_ioctl, | |
2898 | #ifdef CONFIG_COMPAT | |
2899 | .compat_ioctl = pkt_ctl_compat_ioctl, | |
2900 | #endif | |
2901 | .owner = THIS_MODULE, | |
6038f373 | 2902 | .llseek = no_llseek, |
1da177e4 LT |
2903 | }; |
2904 | ||
2905 | static struct miscdevice pkt_misc = { | |
2906 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 2907 | .name = DRIVER_NAME, |
e454cea2 | 2908 | .nodename = "pktcdvd/control", |
1da177e4 LT |
2909 | .fops = &pkt_ctl_fops |
2910 | }; | |
2911 | ||
2912 | static int __init pkt_init(void) | |
2913 | { | |
2914 | int ret; | |
2915 | ||
32694850 TM |
2916 | mutex_init(&ctl_mutex); |
2917 | ||
0eaae62a MD |
2918 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
2919 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
2920 | if (!psd_pool) |
2921 | return -ENOMEM; | |
2922 | ||
add21660 | 2923 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 2924 | if (ret < 0) { |
99481334 | 2925 | pr_err("unable to register block device\n"); |
1da177e4 LT |
2926 | goto out2; |
2927 | } | |
add21660 TM |
2928 | if (!pktdev_major) |
2929 | pktdev_major = ret; | |
1da177e4 | 2930 | |
32694850 TM |
2931 | ret = pkt_sysfs_init(); |
2932 | if (ret) | |
2933 | goto out; | |
2934 | ||
2935 | pkt_debugfs_init(); | |
2936 | ||
1da177e4 LT |
2937 | ret = misc_register(&pkt_misc); |
2938 | if (ret) { | |
99481334 | 2939 | pr_err("unable to register misc device\n"); |
32694850 | 2940 | goto out_misc; |
1da177e4 LT |
2941 | } |
2942 | ||
928b4d8c | 2943 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
1da177e4 | 2944 | |
1da177e4 LT |
2945 | return 0; |
2946 | ||
32694850 TM |
2947 | out_misc: |
2948 | pkt_debugfs_cleanup(); | |
2949 | pkt_sysfs_cleanup(); | |
1da177e4 | 2950 | out: |
add21660 | 2951 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
2952 | out2: |
2953 | mempool_destroy(psd_pool); | |
2954 | return ret; | |
2955 | } | |
2956 | ||
2957 | static void __exit pkt_exit(void) | |
2958 | { | |
928b4d8c | 2959 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
1da177e4 | 2960 | misc_deregister(&pkt_misc); |
32694850 TM |
2961 | |
2962 | pkt_debugfs_cleanup(); | |
2963 | pkt_sysfs_cleanup(); | |
2964 | ||
add21660 | 2965 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
2966 | mempool_destroy(psd_pool); |
2967 | } | |
2968 | ||
2969 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
2970 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
2971 | MODULE_LICENSE("GPL"); | |
2972 | ||
2973 | module_init(pkt_init); | |
2974 | module_exit(pkt_exit); |