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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> |
1da177e4 LT |
64 | #include <scsi/scsi_cmnd.h> |
65 | #include <scsi/scsi_ioctl.h> | |
cef28963 | 66 | #include <scsi/scsi.h> |
32694850 TM |
67 | #include <linux/debugfs.h> |
68 | #include <linux/device.h> | |
1da177e4 LT |
69 | |
70 | #include <asm/uaccess.h> | |
71 | ||
7822082d TM |
72 | #define DRIVER_NAME "pktcdvd" |
73 | ||
fa63c0ab JP |
74 | #define pkt_err(pd, fmt, ...) \ |
75 | pr_err("%s: " fmt, pd->name, ##__VA_ARGS__) | |
ca73dabc JP |
76 | #define pkt_notice(pd, fmt, ...) \ |
77 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__) | |
fa63c0ab | 78 | |
844aa797 JP |
79 | #define pkt_dbg(level, pd, fmt, ...) \ |
80 | do { \ | |
81 | if (level == 2 && PACKET_DEBUG >= 2) \ | |
82 | pr_notice("%s: %s():" fmt, \ | |
83 | pd->name, __func__, ##__VA_ARGS__); \ | |
84 | else if (level == 1 && PACKET_DEBUG >= 1) \ | |
85 | pr_notice("%s: " fmt, pd->name, ##__VA_ARGS__); \ | |
cd3f2cd0 | 86 | } while (0) |
1da177e4 LT |
87 | |
88 | #define MAX_SPEED 0xffff | |
89 | ||
2a48fc0a | 90 | static DEFINE_MUTEX(pktcdvd_mutex); |
1da177e4 LT |
91 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
92 | static struct proc_dir_entry *pkt_proc; | |
add21660 | 93 | static int pktdev_major; |
0a0fc960 TM |
94 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
95 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
1657f824 | 96 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
1da177e4 LT |
97 | static mempool_t *psd_pool; |
98 | ||
32694850 | 99 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
ea5ffff5 | 100 | static struct dentry *pkt_debugfs_root = NULL; /* /sys/kernel/debug/pktcdvd */ |
32694850 TM |
101 | |
102 | /* forward declaration */ | |
103 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
104 | static int pkt_remove_dev(dev_t pkt_dev); | |
105 | static int pkt_seq_show(struct seq_file *m, void *p); | |
106 | ||
5323fb77 JP |
107 | static sector_t get_zone(sector_t sector, struct pktcdvd_device *pd) |
108 | { | |
109 | return (sector + pd->offset) & ~(sector_t)(pd->settings.size - 1); | |
110 | } | |
32694850 TM |
111 | |
112 | /* | |
113 | * create and register a pktcdvd kernel object. | |
114 | */ | |
115 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
116 | const char* name, | |
117 | struct kobject* parent, | |
118 | struct kobj_type* ktype) | |
119 | { | |
120 | struct pktcdvd_kobj *p; | |
89c42606 GKH |
121 | int error; |
122 | ||
32694850 TM |
123 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
124 | if (!p) | |
125 | return NULL; | |
32694850 | 126 | p->pd = pd; |
89c42606 GKH |
127 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
128 | if (error) { | |
d17a18dd | 129 | kobject_put(&p->kobj); |
32694850 | 130 | return NULL; |
d17a18dd | 131 | } |
89c42606 | 132 | kobject_uevent(&p->kobj, KOBJ_ADD); |
32694850 TM |
133 | return p; |
134 | } | |
135 | /* | |
136 | * remove a pktcdvd kernel object. | |
137 | */ | |
138 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) | |
139 | { | |
140 | if (p) | |
c10997f6 | 141 | kobject_put(&p->kobj); |
32694850 TM |
142 | } |
143 | /* | |
144 | * default release function for pktcdvd kernel objects. | |
145 | */ | |
146 | static void pkt_kobj_release(struct kobject *kobj) | |
147 | { | |
148 | kfree(to_pktcdvdkobj(kobj)); | |
149 | } | |
150 | ||
151 | ||
152 | /********************************************************** | |
153 | * | |
154 | * sysfs interface for pktcdvd | |
155 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
156 | * | |
157 | **********************************************************/ | |
158 | ||
159 | #define DEF_ATTR(_obj,_name,_mode) \ | |
7b595756 | 160 | static struct attribute _obj = { .name = _name, .mode = _mode } |
32694850 TM |
161 | |
162 | /********************************************************** | |
163 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
164 | stat/reset | |
165 | stat/packets_started | |
166 | stat/packets_finished | |
167 | stat/kb_written | |
168 | stat/kb_read | |
169 | stat/kb_read_gather | |
170 | write_queue/size | |
171 | write_queue/congestion_off | |
172 | write_queue/congestion_on | |
173 | **********************************************************/ | |
174 | ||
175 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); | |
176 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); | |
177 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); | |
178 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); | |
179 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); | |
180 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); | |
181 | ||
182 | static struct attribute *kobj_pkt_attrs_stat[] = { | |
183 | &kobj_pkt_attr_st1, | |
184 | &kobj_pkt_attr_st2, | |
185 | &kobj_pkt_attr_st3, | |
186 | &kobj_pkt_attr_st4, | |
187 | &kobj_pkt_attr_st5, | |
188 | &kobj_pkt_attr_st6, | |
189 | NULL | |
190 | }; | |
191 | ||
192 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); | |
193 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); | |
194 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); | |
195 | ||
196 | static struct attribute *kobj_pkt_attrs_wqueue[] = { | |
197 | &kobj_pkt_attr_wq1, | |
198 | &kobj_pkt_attr_wq2, | |
199 | &kobj_pkt_attr_wq3, | |
200 | NULL | |
201 | }; | |
202 | ||
32694850 TM |
203 | static ssize_t kobj_pkt_show(struct kobject *kobj, |
204 | struct attribute *attr, char *data) | |
205 | { | |
206 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
207 | int n = 0; | |
208 | int v; | |
209 | if (strcmp(attr->name, "packets_started") == 0) { | |
210 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); | |
211 | ||
212 | } else if (strcmp(attr->name, "packets_finished") == 0) { | |
213 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); | |
214 | ||
215 | } else if (strcmp(attr->name, "kb_written") == 0) { | |
216 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); | |
217 | ||
218 | } else if (strcmp(attr->name, "kb_read") == 0) { | |
219 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); | |
220 | ||
221 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { | |
222 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); | |
223 | ||
224 | } else if (strcmp(attr->name, "size") == 0) { | |
225 | spin_lock(&pd->lock); | |
226 | v = pd->bio_queue_size; | |
227 | spin_unlock(&pd->lock); | |
228 | n = sprintf(data, "%d\n", v); | |
229 | ||
230 | } else if (strcmp(attr->name, "congestion_off") == 0) { | |
231 | spin_lock(&pd->lock); | |
232 | v = pd->write_congestion_off; | |
233 | spin_unlock(&pd->lock); | |
234 | n = sprintf(data, "%d\n", v); | |
235 | ||
236 | } else if (strcmp(attr->name, "congestion_on") == 0) { | |
237 | spin_lock(&pd->lock); | |
238 | v = pd->write_congestion_on; | |
239 | spin_unlock(&pd->lock); | |
240 | n = sprintf(data, "%d\n", v); | |
241 | } | |
242 | return n; | |
243 | } | |
244 | ||
245 | static void init_write_congestion_marks(int* lo, int* hi) | |
246 | { | |
247 | if (*hi > 0) { | |
248 | *hi = max(*hi, 500); | |
249 | *hi = min(*hi, 1000000); | |
250 | if (*lo <= 0) | |
251 | *lo = *hi - 100; | |
252 | else { | |
253 | *lo = min(*lo, *hi - 100); | |
254 | *lo = max(*lo, 100); | |
255 | } | |
256 | } else { | |
257 | *hi = -1; | |
258 | *lo = -1; | |
259 | } | |
260 | } | |
261 | ||
262 | static ssize_t kobj_pkt_store(struct kobject *kobj, | |
263 | struct attribute *attr, | |
264 | const char *data, size_t len) | |
265 | { | |
266 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
267 | int val; | |
32694850 | 268 | |
83f3aa3d | 269 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
32694850 TM |
270 | pd->stats.pkt_started = 0; |
271 | pd->stats.pkt_ended = 0; | |
272 | pd->stats.secs_w = 0; | |
273 | pd->stats.secs_rg = 0; | |
274 | pd->stats.secs_r = 0; | |
275 | ||
276 | } else if (strcmp(attr->name, "congestion_off") == 0 | |
83f3aa3d | 277 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
278 | spin_lock(&pd->lock); |
279 | pd->write_congestion_off = val; | |
280 | init_write_congestion_marks(&pd->write_congestion_off, | |
281 | &pd->write_congestion_on); | |
282 | spin_unlock(&pd->lock); | |
283 | ||
284 | } else if (strcmp(attr->name, "congestion_on") == 0 | |
83f3aa3d | 285 | && sscanf(data, "%d", &val) == 1) { |
32694850 TM |
286 | spin_lock(&pd->lock); |
287 | pd->write_congestion_on = val; | |
288 | init_write_congestion_marks(&pd->write_congestion_off, | |
289 | &pd->write_congestion_on); | |
290 | spin_unlock(&pd->lock); | |
291 | } | |
292 | return len; | |
293 | } | |
294 | ||
52cf25d0 | 295 | static const struct sysfs_ops kobj_pkt_ops = { |
32694850 TM |
296 | .show = kobj_pkt_show, |
297 | .store = kobj_pkt_store | |
298 | }; | |
299 | static struct kobj_type kobj_pkt_type_stat = { | |
300 | .release = pkt_kobj_release, | |
301 | .sysfs_ops = &kobj_pkt_ops, | |
302 | .default_attrs = kobj_pkt_attrs_stat | |
303 | }; | |
304 | static struct kobj_type kobj_pkt_type_wqueue = { | |
305 | .release = pkt_kobj_release, | |
306 | .sysfs_ops = &kobj_pkt_ops, | |
307 | .default_attrs = kobj_pkt_attrs_wqueue | |
308 | }; | |
309 | ||
310 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) | |
311 | { | |
312 | if (class_pktcdvd) { | |
cba76717 | 313 | pd->dev = device_create(class_pktcdvd, NULL, MKDEV(0, 0), NULL, |
1ff9f542 | 314 | "%s", pd->name); |
6013c12b TJ |
315 | if (IS_ERR(pd->dev)) |
316 | pd->dev = NULL; | |
32694850 | 317 | } |
6013c12b | 318 | if (pd->dev) { |
32694850 | 319 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
6013c12b | 320 | &pd->dev->kobj, |
32694850 TM |
321 | &kobj_pkt_type_stat); |
322 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
6013c12b | 323 | &pd->dev->kobj, |
32694850 TM |
324 | &kobj_pkt_type_wqueue); |
325 | } | |
326 | } | |
327 | ||
328 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
329 | { | |
330 | pkt_kobj_remove(pd->kobj_stat); | |
331 | pkt_kobj_remove(pd->kobj_wqueue); | |
332 | if (class_pktcdvd) | |
ca0bf64d | 333 | device_unregister(pd->dev); |
32694850 TM |
334 | } |
335 | ||
336 | ||
337 | /******************************************************************** | |
338 | /sys/class/pktcdvd/ | |
339 | add map block device | |
340 | remove unmap packet dev | |
341 | device_map show mappings | |
342 | *******************************************************************/ | |
343 | ||
344 | static void class_pktcdvd_release(struct class *cls) | |
345 | { | |
346 | kfree(cls); | |
347 | } | |
28812fe1 AK |
348 | static ssize_t class_pktcdvd_show_map(struct class *c, |
349 | struct class_attribute *attr, | |
350 | char *data) | |
32694850 TM |
351 | { |
352 | int n = 0; | |
353 | int idx; | |
354 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
355 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
356 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
357 | if (!pd) | |
358 | continue; | |
359 | n += sprintf(data+n, "%s %u:%u %u:%u\n", | |
360 | pd->name, | |
361 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), | |
362 | MAJOR(pd->bdev->bd_dev), | |
363 | MINOR(pd->bdev->bd_dev)); | |
364 | } | |
365 | mutex_unlock(&ctl_mutex); | |
366 | return n; | |
367 | } | |
368 | ||
28812fe1 AK |
369 | static ssize_t class_pktcdvd_store_add(struct class *c, |
370 | struct class_attribute *attr, | |
371 | const char *buf, | |
32694850 TM |
372 | size_t count) |
373 | { | |
374 | unsigned int major, minor; | |
fffe487d | 375 | |
83f3aa3d | 376 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
fffe487d TH |
377 | /* pkt_setup_dev() expects caller to hold reference to self */ |
378 | if (!try_module_get(THIS_MODULE)) | |
379 | return -ENODEV; | |
380 | ||
32694850 | 381 | pkt_setup_dev(MKDEV(major, minor), NULL); |
fffe487d TH |
382 | |
383 | module_put(THIS_MODULE); | |
384 | ||
32694850 TM |
385 | return count; |
386 | } | |
fffe487d | 387 | |
32694850 TM |
388 | return -EINVAL; |
389 | } | |
390 | ||
28812fe1 AK |
391 | static ssize_t class_pktcdvd_store_remove(struct class *c, |
392 | struct class_attribute *attr, | |
393 | const char *buf, | |
32694850 TM |
394 | size_t count) |
395 | { | |
396 | unsigned int major, minor; | |
83f3aa3d | 397 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
32694850 TM |
398 | pkt_remove_dev(MKDEV(major, minor)); |
399 | return count; | |
400 | } | |
401 | return -EINVAL; | |
402 | } | |
403 | ||
404 | static struct class_attribute class_pktcdvd_attrs[] = { | |
405 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), | |
406 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), | |
407 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), | |
408 | __ATTR_NULL | |
409 | }; | |
410 | ||
411 | ||
412 | static int pkt_sysfs_init(void) | |
413 | { | |
414 | int ret = 0; | |
415 | ||
416 | /* | |
417 | * create control files in sysfs | |
418 | * /sys/class/pktcdvd/... | |
419 | */ | |
420 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
421 | if (!class_pktcdvd) | |
422 | return -ENOMEM; | |
423 | class_pktcdvd->name = DRIVER_NAME; | |
424 | class_pktcdvd->owner = THIS_MODULE; | |
425 | class_pktcdvd->class_release = class_pktcdvd_release; | |
426 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; | |
427 | ret = class_register(class_pktcdvd); | |
428 | if (ret) { | |
429 | kfree(class_pktcdvd); | |
430 | class_pktcdvd = NULL; | |
99481334 | 431 | pr_err("failed to create class pktcdvd\n"); |
32694850 TM |
432 | return ret; |
433 | } | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static void pkt_sysfs_cleanup(void) | |
438 | { | |
439 | if (class_pktcdvd) | |
440 | class_destroy(class_pktcdvd); | |
441 | class_pktcdvd = NULL; | |
442 | } | |
443 | ||
444 | /******************************************************************** | |
445 | entries in debugfs | |
446 | ||
156f5a78 | 447 | /sys/kernel/debug/pktcdvd[0-7]/ |
32694850 TM |
448 | info |
449 | ||
450 | *******************************************************************/ | |
451 | ||
452 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
453 | { | |
454 | return pkt_seq_show(m, p); | |
455 | } | |
456 | ||
457 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
458 | { | |
459 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
460 | } | |
461 | ||
2b8693c0 | 462 | static const struct file_operations debug_fops = { |
32694850 TM |
463 | .open = pkt_debugfs_fops_open, |
464 | .read = seq_read, | |
465 | .llseek = seq_lseek, | |
466 | .release = single_release, | |
467 | .owner = THIS_MODULE, | |
468 | }; | |
469 | ||
470 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
471 | { | |
472 | if (!pkt_debugfs_root) | |
473 | return; | |
474 | pd->dfs_f_info = NULL; | |
475 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); | |
476 | if (IS_ERR(pd->dfs_d_root)) { | |
477 | pd->dfs_d_root = NULL; | |
478 | return; | |
479 | } | |
480 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, | |
481 | pd->dfs_d_root, pd, &debug_fops); | |
482 | if (IS_ERR(pd->dfs_f_info)) { | |
483 | pd->dfs_f_info = NULL; | |
484 | return; | |
485 | } | |
486 | } | |
487 | ||
488 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
489 | { | |
490 | if (!pkt_debugfs_root) | |
491 | return; | |
492 | if (pd->dfs_f_info) | |
493 | debugfs_remove(pd->dfs_f_info); | |
494 | pd->dfs_f_info = NULL; | |
495 | if (pd->dfs_d_root) | |
496 | debugfs_remove(pd->dfs_d_root); | |
497 | pd->dfs_d_root = NULL; | |
498 | } | |
499 | ||
500 | static void pkt_debugfs_init(void) | |
501 | { | |
502 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
503 | if (IS_ERR(pkt_debugfs_root)) { | |
504 | pkt_debugfs_root = NULL; | |
505 | return; | |
506 | } | |
507 | } | |
508 | ||
509 | static void pkt_debugfs_cleanup(void) | |
510 | { | |
511 | if (!pkt_debugfs_root) | |
512 | return; | |
513 | debugfs_remove(pkt_debugfs_root); | |
514 | pkt_debugfs_root = NULL; | |
515 | } | |
516 | ||
517 | /* ----------------------------------------------------------*/ | |
518 | ||
1da177e4 LT |
519 | |
520 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
521 | { | |
522 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
523 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
844aa797 | 524 | pkt_dbg(2, pd, "queue empty\n"); |
1da177e4 LT |
525 | atomic_set(&pd->iosched.attention, 1); |
526 | wake_up(&pd->wqueue); | |
527 | } | |
528 | } | |
529 | ||
1da177e4 LT |
530 | /* |
531 | * Allocate a packet_data struct | |
532 | */ | |
e1bc89bc | 533 | static struct packet_data *pkt_alloc_packet_data(int frames) |
1da177e4 LT |
534 | { |
535 | int i; | |
536 | struct packet_data *pkt; | |
537 | ||
1107d2e0 | 538 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
1da177e4 LT |
539 | if (!pkt) |
540 | goto no_pkt; | |
1da177e4 | 541 | |
e1bc89bc | 542 | pkt->frames = frames; |
ccc5c9ca | 543 | pkt->w_bio = bio_kmalloc(GFP_KERNEL, frames); |
1da177e4 LT |
544 | if (!pkt->w_bio) |
545 | goto no_bio; | |
546 | ||
e1bc89bc | 547 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
1da177e4 LT |
548 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
549 | if (!pkt->pages[i]) | |
550 | goto no_page; | |
551 | } | |
552 | ||
553 | spin_lock_init(&pkt->lock); | |
c5ecc484 | 554 | bio_list_init(&pkt->orig_bios); |
1da177e4 | 555 | |
e1bc89bc | 556 | for (i = 0; i < frames; i++) { |
ccc5c9ca | 557 | struct bio *bio = bio_kmalloc(GFP_KERNEL, 1); |
1da177e4 LT |
558 | if (!bio) |
559 | goto no_rd_bio; | |
ccc5c9ca | 560 | |
1da177e4 LT |
561 | pkt->r_bios[i] = bio; |
562 | } | |
563 | ||
564 | return pkt; | |
565 | ||
566 | no_rd_bio: | |
e1bc89bc | 567 | for (i = 0; i < frames; i++) { |
1da177e4 LT |
568 | struct bio *bio = pkt->r_bios[i]; |
569 | if (bio) | |
570 | bio_put(bio); | |
571 | } | |
572 | ||
573 | no_page: | |
e1bc89bc | 574 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
575 | if (pkt->pages[i]) |
576 | __free_page(pkt->pages[i]); | |
577 | bio_put(pkt->w_bio); | |
578 | no_bio: | |
579 | kfree(pkt); | |
580 | no_pkt: | |
581 | return NULL; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Free a packet_data struct | |
586 | */ | |
587 | static void pkt_free_packet_data(struct packet_data *pkt) | |
588 | { | |
589 | int i; | |
590 | ||
e1bc89bc | 591 | for (i = 0; i < pkt->frames; i++) { |
1da177e4 LT |
592 | struct bio *bio = pkt->r_bios[i]; |
593 | if (bio) | |
594 | bio_put(bio); | |
595 | } | |
e1bc89bc | 596 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
1da177e4 LT |
597 | __free_page(pkt->pages[i]); |
598 | bio_put(pkt->w_bio); | |
599 | kfree(pkt); | |
600 | } | |
601 | ||
602 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
603 | { | |
604 | struct packet_data *pkt, *next; | |
605 | ||
606 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
607 | ||
608 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
609 | pkt_free_packet_data(pkt); | |
610 | } | |
e1bc89bc | 611 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
1da177e4 LT |
612 | } |
613 | ||
614 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
615 | { | |
616 | struct packet_data *pkt; | |
617 | ||
e1bc89bc PO |
618 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
619 | ||
1da177e4 | 620 | while (nr_packets > 0) { |
e1bc89bc | 621 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
1da177e4 LT |
622 | if (!pkt) { |
623 | pkt_shrink_pktlist(pd); | |
624 | return 0; | |
625 | } | |
626 | pkt->id = nr_packets; | |
627 | pkt->pd = pd; | |
628 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
629 | nr_packets--; | |
630 | } | |
631 | return 1; | |
632 | } | |
633 | ||
1da177e4 LT |
634 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
635 | { | |
636 | struct rb_node *n = rb_next(&node->rb_node); | |
637 | if (!n) | |
638 | return NULL; | |
639 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
640 | } | |
641 | ||
ac893963 | 642 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
1da177e4 LT |
643 | { |
644 | rb_erase(&node->rb_node, &pd->bio_queue); | |
645 | mempool_free(node, pd->rb_pool); | |
646 | pd->bio_queue_size--; | |
647 | BUG_ON(pd->bio_queue_size < 0); | |
648 | } | |
649 | ||
650 | /* | |
651 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
652 | */ | |
653 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
654 | { | |
655 | struct rb_node *n = pd->bio_queue.rb_node; | |
656 | struct rb_node *next; | |
657 | struct pkt_rb_node *tmp; | |
658 | ||
659 | if (!n) { | |
660 | BUG_ON(pd->bio_queue_size > 0); | |
661 | return NULL; | |
662 | } | |
663 | ||
664 | for (;;) { | |
665 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
666 | if (s <= tmp->bio->bi_sector) | |
667 | next = n->rb_left; | |
668 | else | |
669 | next = n->rb_right; | |
670 | if (!next) | |
671 | break; | |
672 | n = next; | |
673 | } | |
674 | ||
675 | if (s > tmp->bio->bi_sector) { | |
676 | tmp = pkt_rbtree_next(tmp); | |
677 | if (!tmp) | |
678 | return NULL; | |
679 | } | |
680 | BUG_ON(s > tmp->bio->bi_sector); | |
681 | return tmp; | |
682 | } | |
683 | ||
684 | /* | |
685 | * Insert a node into the pd->bio_queue rb tree. | |
686 | */ | |
687 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
688 | { | |
689 | struct rb_node **p = &pd->bio_queue.rb_node; | |
690 | struct rb_node *parent = NULL; | |
691 | sector_t s = node->bio->bi_sector; | |
692 | struct pkt_rb_node *tmp; | |
693 | ||
694 | while (*p) { | |
695 | parent = *p; | |
696 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
697 | if (s < tmp->bio->bi_sector) | |
698 | p = &(*p)->rb_left; | |
699 | else | |
700 | p = &(*p)->rb_right; | |
701 | } | |
702 | rb_link_node(&node->rb_node, parent, p); | |
703 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
704 | pd->bio_queue_size++; | |
705 | } | |
706 | ||
1da177e4 LT |
707 | /* |
708 | * Send a packet_command to the underlying block device and | |
709 | * wait for completion. | |
710 | */ | |
711 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
712 | { | |
165125e1 | 713 | struct request_queue *q = bdev_get_queue(pd->bdev); |
1da177e4 | 714 | struct request *rq; |
406c9b60 CH |
715 | int ret = 0; |
716 | ||
717 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? | |
718 | WRITE : READ, __GFP_WAIT); | |
719 | ||
720 | if (cgc->buflen) { | |
721 | if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT)) | |
722 | goto out; | |
723 | } | |
1da177e4 | 724 | |
91e4ee38 | 725 | rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
406c9b60 | 726 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
1da177e4 | 727 | |
1da177e4 | 728 | rq->timeout = 60*HZ; |
4aff5e23 | 729 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
1da177e4 | 730 | if (cgc->quiet) |
4aff5e23 | 731 | rq->cmd_flags |= REQ_QUIET; |
1da177e4 | 732 | |
406c9b60 | 733 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
cbc31a47 AM |
734 | if (rq->errors) |
735 | ret = -EIO; | |
406c9b60 | 736 | out: |
1da177e4 | 737 | blk_put_request(rq); |
406c9b60 | 738 | return ret; |
1da177e4 LT |
739 | } |
740 | ||
99481334 JP |
741 | static const char *sense_key_string(__u8 index) |
742 | { | |
743 | static const char * const info[] = { | |
744 | "No sense", "Recovered error", "Not ready", | |
745 | "Medium error", "Hardware error", "Illegal request", | |
746 | "Unit attention", "Data protect", "Blank check", | |
747 | }; | |
748 | ||
749 | return index < ARRAY_SIZE(info) ? info[index] : "INVALID"; | |
750 | } | |
751 | ||
1da177e4 LT |
752 | /* |
753 | * A generic sense dump / resolve mechanism should be implemented across | |
754 | * all ATAPI + SCSI devices. | |
755 | */ | |
756 | static void pkt_dump_sense(struct packet_command *cgc) | |
757 | { | |
1da177e4 LT |
758 | struct request_sense *sense = cgc->sense; |
759 | ||
99481334 JP |
760 | if (sense) |
761 | pr_err("%*ph - sense %02x.%02x.%02x (%s)\n", | |
762 | CDROM_PACKET_SIZE, cgc->cmd, | |
763 | sense->sense_key, sense->asc, sense->ascq, | |
764 | sense_key_string(sense->sense_key)); | |
765 | else | |
766 | pr_err("%*ph - no sense\n", CDROM_PACKET_SIZE, cgc->cmd); | |
1da177e4 LT |
767 | } |
768 | ||
769 | /* | |
770 | * flush the drive cache to media | |
771 | */ | |
772 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
773 | { | |
774 | struct packet_command cgc; | |
775 | ||
776 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
777 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
778 | cgc.quiet = 1; | |
779 | ||
780 | /* | |
781 | * the IMMED bit -- we default to not setting it, although that | |
782 | * would allow a much faster close, this is safer | |
783 | */ | |
784 | #if 0 | |
785 | cgc.cmd[1] = 1 << 1; | |
786 | #endif | |
787 | return pkt_generic_packet(pd, &cgc); | |
788 | } | |
789 | ||
790 | /* | |
791 | * speed is given as the normal factor, e.g. 4 for 4x | |
792 | */ | |
05680d86 PO |
793 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
794 | unsigned write_speed, unsigned read_speed) | |
1da177e4 LT |
795 | { |
796 | struct packet_command cgc; | |
797 | struct request_sense sense; | |
798 | int ret; | |
799 | ||
800 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
801 | cgc.sense = &sense; | |
802 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
803 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
804 | cgc.cmd[3] = read_speed & 0xff; | |
805 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
806 | cgc.cmd[5] = write_speed & 0xff; | |
807 | ||
808 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
809 | pkt_dump_sense(&cgc); | |
810 | ||
811 | return ret; | |
812 | } | |
813 | ||
814 | /* | |
815 | * Queue a bio for processing by the low-level CD device. Must be called | |
816 | * from process context. | |
817 | */ | |
46c271be | 818 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
1da177e4 LT |
819 | { |
820 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
821 | if (bio_data_dir(bio) == READ) |
822 | bio_list_add(&pd->iosched.read_queue, bio); | |
823 | else | |
824 | bio_list_add(&pd->iosched.write_queue, bio); | |
1da177e4 LT |
825 | spin_unlock(&pd->iosched.lock); |
826 | ||
827 | atomic_set(&pd->iosched.attention, 1); | |
828 | wake_up(&pd->wqueue); | |
829 | } | |
830 | ||
831 | /* | |
832 | * Process the queued read/write requests. This function handles special | |
833 | * requirements for CDRW drives: | |
834 | * - A cache flush command must be inserted before a read request if the | |
835 | * previous request was a write. | |
46c271be | 836 | * - Switching between reading and writing is slow, so don't do it more often |
1da177e4 | 837 | * than necessary. |
46c271be PO |
838 | * - Optimize for throughput at the expense of latency. This means that streaming |
839 | * writes will never be interrupted by a read, but if the drive has to seek | |
840 | * before the next write, switch to reading instead if there are any pending | |
841 | * read requests. | |
1da177e4 LT |
842 | * - Set the read speed according to current usage pattern. When only reading |
843 | * from the device, it's best to use the highest possible read speed, but | |
844 | * when switching often between reading and writing, it's better to have the | |
845 | * same read and write speeds. | |
1da177e4 LT |
846 | */ |
847 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
848 | { | |
1da177e4 LT |
849 | |
850 | if (atomic_read(&pd->iosched.attention) == 0) | |
851 | return; | |
852 | atomic_set(&pd->iosched.attention, 0); | |
853 | ||
1da177e4 LT |
854 | for (;;) { |
855 | struct bio *bio; | |
46c271be | 856 | int reads_queued, writes_queued; |
1da177e4 LT |
857 | |
858 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
859 | reads_queued = !bio_list_empty(&pd->iosched.read_queue); |
860 | writes_queued = !bio_list_empty(&pd->iosched.write_queue); | |
1da177e4 LT |
861 | spin_unlock(&pd->iosched.lock); |
862 | ||
863 | if (!reads_queued && !writes_queued) | |
864 | break; | |
865 | ||
866 | if (pd->iosched.writing) { | |
46c271be PO |
867 | int need_write_seek = 1; |
868 | spin_lock(&pd->iosched.lock); | |
c5ecc484 | 869 | bio = bio_list_peek(&pd->iosched.write_queue); |
46c271be PO |
870 | spin_unlock(&pd->iosched.lock); |
871 | if (bio && (bio->bi_sector == pd->iosched.last_write)) | |
872 | need_write_seek = 0; | |
873 | if (need_write_seek && reads_queued) { | |
1da177e4 | 874 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
844aa797 | 875 | pkt_dbg(2, pd, "write, waiting\n"); |
1da177e4 LT |
876 | break; |
877 | } | |
878 | pkt_flush_cache(pd); | |
879 | pd->iosched.writing = 0; | |
880 | } | |
881 | } else { | |
882 | if (!reads_queued && writes_queued) { | |
883 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
844aa797 | 884 | pkt_dbg(2, pd, "read, waiting\n"); |
1da177e4 LT |
885 | break; |
886 | } | |
887 | pd->iosched.writing = 1; | |
888 | } | |
889 | } | |
890 | ||
891 | spin_lock(&pd->iosched.lock); | |
c5ecc484 AM |
892 | if (pd->iosched.writing) |
893 | bio = bio_list_pop(&pd->iosched.write_queue); | |
894 | else | |
895 | bio = bio_list_pop(&pd->iosched.read_queue); | |
1da177e4 LT |
896 | spin_unlock(&pd->iosched.lock); |
897 | ||
898 | if (!bio) | |
899 | continue; | |
900 | ||
901 | if (bio_data_dir(bio) == READ) | |
902 | pd->iosched.successive_reads += bio->bi_size >> 10; | |
46c271be | 903 | else { |
1da177e4 | 904 | pd->iosched.successive_reads = 0; |
f73a1c7d | 905 | pd->iosched.last_write = bio_end_sector(bio); |
46c271be | 906 | } |
1da177e4 LT |
907 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
908 | if (pd->read_speed == pd->write_speed) { | |
909 | pd->read_speed = MAX_SPEED; | |
910 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
911 | } | |
912 | } else { | |
913 | if (pd->read_speed != pd->write_speed) { | |
914 | pd->read_speed = pd->write_speed; | |
915 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
916 | } | |
917 | } | |
918 | ||
919 | atomic_inc(&pd->cdrw.pending_bios); | |
920 | generic_make_request(bio); | |
921 | } | |
922 | } | |
923 | ||
924 | /* | |
925 | * Special care is needed if the underlying block device has a small | |
926 | * max_phys_segments value. | |
927 | */ | |
165125e1 | 928 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
1da177e4 | 929 | { |
ae03bf63 | 930 | if ((pd->settings.size << 9) / CD_FRAMESIZE |
8a78362c | 931 | <= queue_max_segments(q)) { |
1da177e4 LT |
932 | /* |
933 | * The cdrom device can handle one segment/frame | |
934 | */ | |
935 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
936 | return 0; | |
ae03bf63 | 937 | } else if ((pd->settings.size << 9) / PAGE_SIZE |
8a78362c | 938 | <= queue_max_segments(q)) { |
1da177e4 LT |
939 | /* |
940 | * We can handle this case at the expense of some extra memory | |
941 | * copies during write operations | |
942 | */ | |
943 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
944 | return 0; | |
945 | } else { | |
fa63c0ab | 946 | pkt_err(pd, "cdrom max_phys_segments too small\n"); |
1da177e4 LT |
947 | return -EIO; |
948 | } | |
949 | } | |
950 | ||
1da177e4 LT |
951 | /* |
952 | * Copy all data for this packet to pkt->pages[], so that | |
953 | * a) The number of required segments for the write bio is minimized, which | |
954 | * is necessary for some scsi controllers. | |
955 | * b) The data can be used as cache to avoid read requests if we receive a | |
956 | * new write request for the same zone. | |
957 | */ | |
72772323 | 958 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
1da177e4 LT |
959 | { |
960 | int f, p, offs; | |
961 | ||
962 | /* Copy all data to pkt->pages[] */ | |
963 | p = 0; | |
964 | offs = 0; | |
965 | for (f = 0; f < pkt->frames; f++) { | |
72772323 | 966 | if (bvec[f].bv_page != pkt->pages[p]) { |
cfd8005c | 967 | void *vfrom = kmap_atomic(bvec[f].bv_page) + bvec[f].bv_offset; |
1da177e4 LT |
968 | void *vto = page_address(pkt->pages[p]) + offs; |
969 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
cfd8005c | 970 | kunmap_atomic(vfrom); |
72772323 PO |
971 | bvec[f].bv_page = pkt->pages[p]; |
972 | bvec[f].bv_offset = offs; | |
1da177e4 | 973 | } else { |
72772323 | 974 | BUG_ON(bvec[f].bv_offset != offs); |
1da177e4 LT |
975 | } |
976 | offs += CD_FRAMESIZE; | |
977 | if (offs >= PAGE_SIZE) { | |
1da177e4 LT |
978 | offs = 0; |
979 | p++; | |
980 | } | |
981 | } | |
982 | } | |
983 | ||
6712ecf8 | 984 | static void pkt_end_io_read(struct bio *bio, int err) |
1da177e4 LT |
985 | { |
986 | struct packet_data *pkt = bio->bi_private; | |
987 | struct pktcdvd_device *pd = pkt->pd; | |
988 | BUG_ON(!pd); | |
989 | ||
844aa797 | 990 | pkt_dbg(2, pd, "bio=%p sec0=%llx sec=%llx err=%d\n", |
cd3f2cd0 JP |
991 | bio, (unsigned long long)pkt->sector, |
992 | (unsigned long long)bio->bi_sector, err); | |
1da177e4 LT |
993 | |
994 | if (err) | |
995 | atomic_inc(&pkt->io_errors); | |
996 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
997 | atomic_inc(&pkt->run_sm); | |
998 | wake_up(&pd->wqueue); | |
999 | } | |
1000 | pkt_bio_finished(pd); | |
1da177e4 LT |
1001 | } |
1002 | ||
6712ecf8 | 1003 | static void pkt_end_io_packet_write(struct bio *bio, int err) |
1da177e4 LT |
1004 | { |
1005 | struct packet_data *pkt = bio->bi_private; | |
1006 | struct pktcdvd_device *pd = pkt->pd; | |
1007 | BUG_ON(!pd); | |
1008 | ||
844aa797 | 1009 | pkt_dbg(2, pd, "id=%d, err=%d\n", pkt->id, err); |
1da177e4 LT |
1010 | |
1011 | pd->stats.pkt_ended++; | |
1012 | ||
1013 | pkt_bio_finished(pd); | |
1014 | atomic_dec(&pkt->io_wait); | |
1015 | atomic_inc(&pkt->run_sm); | |
1016 | wake_up(&pd->wqueue); | |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | /* | |
1020 | * Schedule reads for the holes in a packet | |
1021 | */ | |
1022 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1023 | { | |
1024 | int frames_read = 0; | |
1025 | struct bio *bio; | |
1026 | int f; | |
1027 | char written[PACKET_MAX_SIZE]; | |
1028 | ||
c5ecc484 | 1029 | BUG_ON(bio_list_empty(&pkt->orig_bios)); |
1da177e4 LT |
1030 | |
1031 | atomic_set(&pkt->io_wait, 0); | |
1032 | atomic_set(&pkt->io_errors, 0); | |
1033 | ||
1da177e4 LT |
1034 | /* |
1035 | * Figure out which frames we need to read before we can write. | |
1036 | */ | |
1037 | memset(written, 0, sizeof(written)); | |
1038 | spin_lock(&pkt->lock); | |
c5ecc484 | 1039 | bio_list_for_each(bio, &pkt->orig_bios) { |
1da177e4 LT |
1040 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
1041 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
06e7ab53 | 1042 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
1da177e4 LT |
1043 | BUG_ON(first_frame < 0); |
1044 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1045 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1046 | written[f] = 1; | |
1047 | } | |
1048 | spin_unlock(&pkt->lock); | |
1049 | ||
06e7ab53 | 1050 | if (pkt->cache_valid) { |
844aa797 | 1051 | pkt_dbg(2, pd, "zone %llx cached\n", |
06e7ab53 PO |
1052 | (unsigned long long)pkt->sector); |
1053 | goto out_account; | |
1054 | } | |
1055 | ||
1da177e4 LT |
1056 | /* |
1057 | * Schedule reads for missing parts of the packet. | |
1058 | */ | |
1059 | for (f = 0; f < pkt->frames; f++) { | |
1060 | int p, offset; | |
ccc5c9ca | 1061 | |
1da177e4 LT |
1062 | if (written[f]) |
1063 | continue; | |
ccc5c9ca | 1064 | |
1da177e4 | 1065 | bio = pkt->r_bios[f]; |
ccc5c9ca | 1066 | bio_reset(bio); |
1da177e4 LT |
1067 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
1068 | bio->bi_bdev = pd->bdev; | |
1069 | bio->bi_end_io = pkt_end_io_read; | |
1070 | bio->bi_private = pkt; | |
1071 | ||
1072 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1073 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
844aa797 | 1074 | pkt_dbg(2, pd, "Adding frame %d, page:%p offs:%d\n", |
1da177e4 LT |
1075 | f, pkt->pages[p], offset); |
1076 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1077 | BUG(); | |
1078 | ||
1079 | atomic_inc(&pkt->io_wait); | |
1080 | bio->bi_rw = READ; | |
46c271be | 1081 | pkt_queue_bio(pd, bio); |
1da177e4 LT |
1082 | frames_read++; |
1083 | } | |
1084 | ||
1085 | out_account: | |
844aa797 | 1086 | pkt_dbg(2, pd, "need %d frames for zone %llx\n", |
1da177e4 LT |
1087 | frames_read, (unsigned long long)pkt->sector); |
1088 | pd->stats.pkt_started++; | |
1089 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | /* | |
1093 | * Find a packet matching zone, or the least recently used packet if | |
1094 | * there is no match. | |
1095 | */ | |
1096 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1097 | { | |
1098 | struct packet_data *pkt; | |
1099 | ||
1100 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1101 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1102 | list_del_init(&pkt->list); | |
1103 | if (pkt->sector != zone) | |
1104 | pkt->cache_valid = 0; | |
610827de | 1105 | return pkt; |
1da177e4 LT |
1106 | } |
1107 | } | |
610827de PO |
1108 | BUG(); |
1109 | return NULL; | |
1da177e4 LT |
1110 | } |
1111 | ||
1112 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1113 | { | |
1114 | if (pkt->cache_valid) { | |
1115 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1116 | } else { | |
1117 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * recover a failed write, query for relocation if possible | |
1123 | * | |
1124 | * returns 1 if recovery is possible, or 0 if not | |
1125 | * | |
1126 | */ | |
1127 | static int pkt_start_recovery(struct packet_data *pkt) | |
1128 | { | |
1129 | /* | |
1130 | * FIXME. We need help from the file system to implement | |
1131 | * recovery handling. | |
1132 | */ | |
1133 | return 0; | |
1134 | #if 0 | |
1135 | struct request *rq = pkt->rq; | |
1136 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1137 | struct block_device *pkt_bdev; | |
1138 | struct super_block *sb = NULL; | |
1139 | unsigned long old_block, new_block; | |
1140 | sector_t new_sector; | |
1141 | ||
1142 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1143 | if (pkt_bdev) { | |
1144 | sb = get_super(pkt_bdev); | |
1145 | bdput(pkt_bdev); | |
1146 | } | |
1147 | ||
1148 | if (!sb) | |
1149 | return 0; | |
1150 | ||
e7f59097 | 1151 | if (!sb->s_op->relocate_blocks) |
1da177e4 LT |
1152 | goto out; |
1153 | ||
1154 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1155 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1156 | goto out; | |
1157 | ||
1158 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1159 | pkt->sector = new_sector; | |
1160 | ||
ff8e0070 KO |
1161 | bio_reset(pkt->bio); |
1162 | pkt->bio->bi_bdev = pd->bdev; | |
1163 | pkt->bio->bi_rw = REQ_WRITE; | |
1da177e4 | 1164 | pkt->bio->bi_sector = new_sector; |
ff8e0070 KO |
1165 | pkt->bio->bi_size = pkt->frames * CD_FRAMESIZE; |
1166 | pkt->bio->bi_vcnt = pkt->frames; | |
1da177e4 | 1167 | |
ff8e0070 KO |
1168 | pkt->bio->bi_end_io = pkt_end_io_packet_write; |
1169 | pkt->bio->bi_private = pkt; | |
1da177e4 LT |
1170 | |
1171 | drop_super(sb); | |
1172 | return 1; | |
1173 | ||
1174 | out: | |
1175 | drop_super(sb); | |
1176 | return 0; | |
1177 | #endif | |
1178 | } | |
1179 | ||
1180 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1181 | { | |
1182 | #if PACKET_DEBUG > 1 | |
1183 | static const char *state_name[] = { | |
1184 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1185 | }; | |
1186 | enum packet_data_state old_state = pkt->state; | |
844aa797 | 1187 | pkt_dbg(2, pd, "pkt %2d : s=%6llx %s -> %s\n", |
cd3f2cd0 | 1188 | pkt->id, (unsigned long long)pkt->sector, |
1da177e4 LT |
1189 | state_name[old_state], state_name[state]); |
1190 | #endif | |
1191 | pkt->state = state; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Scan the work queue to see if we can start a new packet. | |
1196 | * returns non-zero if any work was done. | |
1197 | */ | |
1198 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1199 | { | |
1200 | struct packet_data *pkt, *p; | |
1201 | struct bio *bio = NULL; | |
1202 | sector_t zone = 0; /* Suppress gcc warning */ | |
1203 | struct pkt_rb_node *node, *first_node; | |
1204 | struct rb_node *n; | |
0a0fc960 | 1205 | int wakeup; |
1da177e4 | 1206 | |
1da177e4 LT |
1207 | atomic_set(&pd->scan_queue, 0); |
1208 | ||
1209 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
844aa797 | 1210 | pkt_dbg(2, pd, "no pkt\n"); |
1da177e4 LT |
1211 | return 0; |
1212 | } | |
1213 | ||
1214 | /* | |
1215 | * Try to find a zone we are not already working on. | |
1216 | */ | |
1217 | spin_lock(&pd->lock); | |
1218 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1219 | if (!first_node) { | |
1220 | n = rb_first(&pd->bio_queue); | |
1221 | if (n) | |
1222 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1223 | } | |
1224 | node = first_node; | |
1225 | while (node) { | |
1226 | bio = node->bio; | |
5323fb77 | 1227 | zone = get_zone(bio->bi_sector, pd); |
1da177e4 | 1228 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
7baeb6a5 PO |
1229 | if (p->sector == zone) { |
1230 | bio = NULL; | |
1da177e4 | 1231 | goto try_next_bio; |
7baeb6a5 | 1232 | } |
1da177e4 LT |
1233 | } |
1234 | break; | |
1235 | try_next_bio: | |
1236 | node = pkt_rbtree_next(node); | |
1237 | if (!node) { | |
1238 | n = rb_first(&pd->bio_queue); | |
1239 | if (n) | |
1240 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1241 | } | |
1242 | if (node == first_node) | |
1243 | node = NULL; | |
1244 | } | |
1245 | spin_unlock(&pd->lock); | |
1246 | if (!bio) { | |
844aa797 | 1247 | pkt_dbg(2, pd, "no bio\n"); |
1da177e4 LT |
1248 | return 0; |
1249 | } | |
1250 | ||
1251 | pkt = pkt_get_packet_data(pd, zone); | |
1da177e4 LT |
1252 | |
1253 | pd->current_sector = zone + pd->settings.size; | |
1254 | pkt->sector = zone; | |
e1bc89bc | 1255 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
1da177e4 LT |
1256 | pkt->write_size = 0; |
1257 | ||
1258 | /* | |
1259 | * Scan work queue for bios in the same zone and link them | |
1260 | * to this packet. | |
1261 | */ | |
1262 | spin_lock(&pd->lock); | |
844aa797 | 1263 | pkt_dbg(2, pd, "looking for zone %llx\n", (unsigned long long)zone); |
1da177e4 LT |
1264 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
1265 | bio = node->bio; | |
844aa797 | 1266 | pkt_dbg(2, pd, "found zone=%llx\n", |
5323fb77 JP |
1267 | (unsigned long long)get_zone(bio->bi_sector, pd)); |
1268 | if (get_zone(bio->bi_sector, pd) != zone) | |
1da177e4 LT |
1269 | break; |
1270 | pkt_rbtree_erase(pd, node); | |
1271 | spin_lock(&pkt->lock); | |
c5ecc484 | 1272 | bio_list_add(&pkt->orig_bios, bio); |
1da177e4 LT |
1273 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
1274 | spin_unlock(&pkt->lock); | |
1275 | } | |
0a0fc960 TM |
1276 | /* check write congestion marks, and if bio_queue_size is |
1277 | below, wake up any waiters */ | |
1278 | wakeup = (pd->write_congestion_on > 0 | |
1279 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1da177e4 | 1280 | spin_unlock(&pd->lock); |
8aa7e847 JA |
1281 | if (wakeup) { |
1282 | clear_bdi_congested(&pd->disk->queue->backing_dev_info, | |
1283 | BLK_RW_ASYNC); | |
1284 | } | |
1da177e4 LT |
1285 | |
1286 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1287 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1288 | atomic_set(&pkt->run_sm, 1); | |
1289 | ||
1290 | spin_lock(&pd->cdrw.active_list_lock); | |
1291 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1292 | spin_unlock(&pd->cdrw.active_list_lock); | |
1293 | ||
1294 | return 1; | |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Assemble a bio to write one packet and queue the bio for processing | |
1299 | * by the underlying block device. | |
1300 | */ | |
1301 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1302 | { | |
1da177e4 | 1303 | int f; |
72772323 | 1304 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
1da177e4 | 1305 | |
ffb25dc6 KO |
1306 | bio_reset(pkt->w_bio); |
1307 | pkt->w_bio->bi_sector = pkt->sector; | |
1308 | pkt->w_bio->bi_bdev = pd->bdev; | |
1309 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1310 | pkt->w_bio->bi_private = pkt; | |
1311 | ||
1312 | /* XXX: locking? */ | |
1da177e4 | 1313 | for (f = 0; f < pkt->frames; f++) { |
72772323 PO |
1314 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
1315 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
ffb25dc6 KO |
1316 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) |
1317 | BUG(); | |
1da177e4 | 1318 | } |
844aa797 | 1319 | pkt_dbg(2, pd, "vcnt=%d\n", pkt->w_bio->bi_vcnt); |
1da177e4 LT |
1320 | |
1321 | /* | |
72772323 | 1322 | * Fill-in bvec with data from orig_bios. |
1da177e4 | 1323 | */ |
1da177e4 | 1324 | spin_lock(&pkt->lock); |
ffb25dc6 | 1325 | bio_copy_data(pkt->w_bio, pkt->orig_bios.head); |
1da177e4 | 1326 | |
1da177e4 LT |
1327 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
1328 | spin_unlock(&pkt->lock); | |
1329 | ||
844aa797 | 1330 | pkt_dbg(2, pd, "Writing %d frames for zone %llx\n", |
ffb25dc6 | 1331 | pkt->write_size, (unsigned long long)pkt->sector); |
1da177e4 LT |
1332 | |
1333 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
72772323 | 1334 | pkt_make_local_copy(pkt, bvec); |
1da177e4 LT |
1335 | pkt->cache_valid = 1; |
1336 | } else { | |
1337 | pkt->cache_valid = 0; | |
1338 | } | |
1339 | ||
1340 | /* Start the write request */ | |
1da177e4 LT |
1341 | atomic_set(&pkt->io_wait, 1); |
1342 | pkt->w_bio->bi_rw = WRITE; | |
46c271be | 1343 | pkt_queue_bio(pd, pkt->w_bio); |
1da177e4 LT |
1344 | } |
1345 | ||
1346 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1347 | { | |
c5ecc484 | 1348 | struct bio *bio; |
1da177e4 LT |
1349 | |
1350 | if (!uptodate) | |
1351 | pkt->cache_valid = 0; | |
1352 | ||
1353 | /* Finish all bios corresponding to this packet */ | |
c5ecc484 | 1354 | while ((bio = bio_list_pop(&pkt->orig_bios))) |
6712ecf8 | 1355 | bio_endio(bio, uptodate ? 0 : -EIO); |
1da177e4 LT |
1356 | } |
1357 | ||
1358 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1359 | { | |
1360 | int uptodate; | |
1361 | ||
844aa797 | 1362 | pkt_dbg(2, pd, "pkt %d\n", pkt->id); |
1da177e4 LT |
1363 | |
1364 | for (;;) { | |
1365 | switch (pkt->state) { | |
1366 | case PACKET_WAITING_STATE: | |
1367 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1368 | return; | |
1369 | ||
1370 | pkt->sleep_time = 0; | |
1371 | pkt_gather_data(pd, pkt); | |
1372 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1373 | break; | |
1374 | ||
1375 | case PACKET_READ_WAIT_STATE: | |
1376 | if (atomic_read(&pkt->io_wait) > 0) | |
1377 | return; | |
1378 | ||
1379 | if (atomic_read(&pkt->io_errors) > 0) { | |
1380 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1381 | } else { | |
1382 | pkt_start_write(pd, pkt); | |
1383 | } | |
1384 | break; | |
1385 | ||
1386 | case PACKET_WRITE_WAIT_STATE: | |
1387 | if (atomic_read(&pkt->io_wait) > 0) | |
1388 | return; | |
1389 | ||
1390 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1391 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1392 | } else { | |
1393 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1394 | } | |
1395 | break; | |
1396 | ||
1397 | case PACKET_RECOVERY_STATE: | |
1398 | if (pkt_start_recovery(pkt)) { | |
1399 | pkt_start_write(pd, pkt); | |
1400 | } else { | |
844aa797 | 1401 | pkt_dbg(2, pd, "No recovery possible\n"); |
1da177e4 LT |
1402 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
1403 | } | |
1404 | break; | |
1405 | ||
1406 | case PACKET_FINISHED_STATE: | |
1407 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1408 | pkt_finish_packet(pkt, uptodate); | |
1409 | return; | |
1410 | ||
1411 | default: | |
1412 | BUG(); | |
1413 | break; | |
1414 | } | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1419 | { | |
1420 | struct packet_data *pkt, *next; | |
1421 | ||
1da177e4 LT |
1422 | /* |
1423 | * Run state machine for active packets | |
1424 | */ | |
1425 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1426 | if (atomic_read(&pkt->run_sm) > 0) { | |
1427 | atomic_set(&pkt->run_sm, 0); | |
1428 | pkt_run_state_machine(pd, pkt); | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | /* | |
1433 | * Move no longer active packets to the free list | |
1434 | */ | |
1435 | spin_lock(&pd->cdrw.active_list_lock); | |
1436 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1437 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1438 | list_del(&pkt->list); | |
1439 | pkt_put_packet_data(pd, pkt); | |
1440 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1441 | atomic_set(&pd->scan_queue, 1); | |
1442 | } | |
1443 | } | |
1444 | spin_unlock(&pd->cdrw.active_list_lock); | |
1445 | } | |
1446 | ||
1447 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1448 | { | |
1449 | struct packet_data *pkt; | |
1450 | int i; | |
1451 | ||
ae7642bb | 1452 | for (i = 0; i < PACKET_NUM_STATES; i++) |
1da177e4 LT |
1453 | states[i] = 0; |
1454 | ||
1455 | spin_lock(&pd->cdrw.active_list_lock); | |
1456 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1457 | states[pkt->state]++; | |
1458 | } | |
1459 | spin_unlock(&pd->cdrw.active_list_lock); | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * kcdrwd is woken up when writes have been queued for one of our | |
1464 | * registered devices | |
1465 | */ | |
1466 | static int kcdrwd(void *foobar) | |
1467 | { | |
1468 | struct pktcdvd_device *pd = foobar; | |
1469 | struct packet_data *pkt; | |
1470 | long min_sleep_time, residue; | |
1471 | ||
1472 | set_user_nice(current, -20); | |
83144186 | 1473 | set_freezable(); |
1da177e4 LT |
1474 | |
1475 | for (;;) { | |
1476 | DECLARE_WAITQUEUE(wait, current); | |
1477 | ||
1478 | /* | |
1479 | * Wait until there is something to do | |
1480 | */ | |
1481 | add_wait_queue(&pd->wqueue, &wait); | |
1482 | for (;;) { | |
1483 | set_current_state(TASK_INTERRUPTIBLE); | |
1484 | ||
1485 | /* Check if we need to run pkt_handle_queue */ | |
1486 | if (atomic_read(&pd->scan_queue) > 0) | |
1487 | goto work_to_do; | |
1488 | ||
1489 | /* Check if we need to run the state machine for some packet */ | |
1490 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1491 | if (atomic_read(&pkt->run_sm) > 0) | |
1492 | goto work_to_do; | |
1493 | } | |
1494 | ||
1495 | /* Check if we need to process the iosched queues */ | |
1496 | if (atomic_read(&pd->iosched.attention) != 0) | |
1497 | goto work_to_do; | |
1498 | ||
1499 | /* Otherwise, go to sleep */ | |
1500 | if (PACKET_DEBUG > 1) { | |
1501 | int states[PACKET_NUM_STATES]; | |
1502 | pkt_count_states(pd, states); | |
844aa797 | 1503 | pkt_dbg(2, pd, "i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
cd3f2cd0 JP |
1504 | states[0], states[1], states[2], |
1505 | states[3], states[4], states[5]); | |
1da177e4 LT |
1506 | } |
1507 | ||
1508 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1509 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1510 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1511 | min_sleep_time = pkt->sleep_time; | |
1512 | } | |
1513 | ||
844aa797 | 1514 | pkt_dbg(2, pd, "sleeping\n"); |
1da177e4 | 1515 | residue = schedule_timeout(min_sleep_time); |
844aa797 | 1516 | pkt_dbg(2, pd, "wake up\n"); |
1da177e4 LT |
1517 | |
1518 | /* make swsusp happy with our thread */ | |
3e1d1d28 | 1519 | try_to_freeze(); |
1da177e4 LT |
1520 | |
1521 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1522 | if (!pkt->sleep_time) | |
1523 | continue; | |
1524 | pkt->sleep_time -= min_sleep_time - residue; | |
1525 | if (pkt->sleep_time <= 0) { | |
1526 | pkt->sleep_time = 0; | |
1527 | atomic_inc(&pkt->run_sm); | |
1528 | } | |
1529 | } | |
1530 | ||
1da177e4 LT |
1531 | if (kthread_should_stop()) |
1532 | break; | |
1533 | } | |
1534 | work_to_do: | |
1535 | set_current_state(TASK_RUNNING); | |
1536 | remove_wait_queue(&pd->wqueue, &wait); | |
1537 | ||
1538 | if (kthread_should_stop()) | |
1539 | break; | |
1540 | ||
1541 | /* | |
1542 | * if pkt_handle_queue returns true, we can queue | |
1543 | * another request. | |
1544 | */ | |
1545 | while (pkt_handle_queue(pd)) | |
1546 | ; | |
1547 | ||
1548 | /* | |
1549 | * Handle packet state machine | |
1550 | */ | |
1551 | pkt_handle_packets(pd); | |
1552 | ||
1553 | /* | |
1554 | * Handle iosched queues | |
1555 | */ | |
1556 | pkt_iosched_process_queue(pd); | |
1557 | } | |
1558 | ||
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1563 | { | |
99481334 JP |
1564 | pr_info("%s packets, %u blocks, Mode-%c disc\n", |
1565 | pd->settings.fp ? "Fixed" : "Variable", | |
1566 | pd->settings.size >> 2, | |
1567 | pd->settings.block_mode == 8 ? '1' : '2'); | |
1da177e4 LT |
1568 | } |
1569 | ||
1570 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1571 | { | |
1572 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1573 | ||
1574 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1575 | cgc->cmd[2] = page_code | (page_control << 6); | |
1576 | cgc->cmd[7] = cgc->buflen >> 8; | |
1577 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1578 | cgc->data_direction = CGC_DATA_READ; | |
1579 | return pkt_generic_packet(pd, cgc); | |
1580 | } | |
1581 | ||
1582 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1583 | { | |
1584 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1585 | memset(cgc->buffer, 0, 2); | |
1586 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1587 | cgc->cmd[1] = 0x10; /* PF */ | |
1588 | cgc->cmd[7] = cgc->buflen >> 8; | |
1589 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1590 | cgc->data_direction = CGC_DATA_WRITE; | |
1591 | return pkt_generic_packet(pd, cgc); | |
1592 | } | |
1593 | ||
1594 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1595 | { | |
1596 | struct packet_command cgc; | |
1597 | int ret; | |
1598 | ||
1599 | /* set up command and get the disc info */ | |
1600 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1601 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1602 | cgc.cmd[8] = cgc.buflen = 2; | |
1603 | cgc.quiet = 1; | |
1604 | ||
1605 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1606 | return ret; | |
1607 | ||
1608 | /* not all drives have the same disc_info length, so requeue | |
1609 | * packet with the length the drive tells us it can supply | |
1610 | */ | |
1611 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1612 | sizeof(di->disc_information_length); | |
1613 | ||
1614 | if (cgc.buflen > sizeof(disc_information)) | |
1615 | cgc.buflen = sizeof(disc_information); | |
1616 | ||
1617 | cgc.cmd[8] = cgc.buflen; | |
1618 | return pkt_generic_packet(pd, &cgc); | |
1619 | } | |
1620 | ||
1621 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1622 | { | |
1623 | struct packet_command cgc; | |
1624 | int ret; | |
1625 | ||
1626 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1627 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1628 | cgc.cmd[1] = type & 3; | |
1629 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1630 | cgc.cmd[5] = track & 0xff; | |
1631 | cgc.cmd[8] = 8; | |
1632 | cgc.quiet = 1; | |
1633 | ||
1634 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1635 | return ret; | |
1636 | ||
1637 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1638 | sizeof(ti->track_information_length); | |
1639 | ||
1640 | if (cgc.buflen > sizeof(track_information)) | |
1641 | cgc.buflen = sizeof(track_information); | |
1642 | ||
1643 | cgc.cmd[8] = cgc.buflen; | |
1644 | return pkt_generic_packet(pd, &cgc); | |
1645 | } | |
1646 | ||
05680d86 PO |
1647 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
1648 | long *last_written) | |
1da177e4 LT |
1649 | { |
1650 | disc_information di; | |
1651 | track_information ti; | |
1652 | __u32 last_track; | |
1653 | int ret = -1; | |
1654 | ||
1655 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1656 | return ret; | |
1657 | ||
1658 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1659 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1660 | return ret; | |
1661 | ||
1662 | /* if this track is blank, try the previous. */ | |
1663 | if (ti.blank) { | |
1664 | last_track--; | |
1665 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1666 | return ret; | |
1667 | } | |
1668 | ||
1669 | /* if last recorded field is valid, return it. */ | |
1670 | if (ti.lra_v) { | |
1671 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1672 | } else { | |
1673 | /* make it up instead */ | |
1674 | *last_written = be32_to_cpu(ti.track_start) + | |
1675 | be32_to_cpu(ti.track_size); | |
1676 | if (ti.free_blocks) | |
1677 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1678 | } | |
1679 | return 0; | |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * write mode select package based on pd->settings | |
1684 | */ | |
05680d86 | 1685 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1686 | { |
1687 | struct packet_command cgc; | |
1688 | struct request_sense sense; | |
1689 | write_param_page *wp; | |
1690 | char buffer[128]; | |
1691 | int ret, size; | |
1692 | ||
1693 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1694 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1695 | return 0; | |
1696 | ||
1697 | memset(buffer, 0, sizeof(buffer)); | |
1698 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1699 | cgc.sense = &sense; | |
1700 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1701 | pkt_dump_sense(&cgc); | |
1702 | return ret; | |
1703 | } | |
1704 | ||
1705 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1706 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1707 | if (size > sizeof(buffer)) | |
1708 | size = sizeof(buffer); | |
1709 | ||
1710 | /* | |
1711 | * now get it all | |
1712 | */ | |
1713 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1714 | cgc.sense = &sense; | |
1715 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1716 | pkt_dump_sense(&cgc); | |
1717 | return ret; | |
1718 | } | |
1719 | ||
1720 | /* | |
1721 | * write page is offset header + block descriptor length | |
1722 | */ | |
1723 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1724 | ||
1725 | wp->fp = pd->settings.fp; | |
1726 | wp->track_mode = pd->settings.track_mode; | |
1727 | wp->write_type = pd->settings.write_type; | |
1728 | wp->data_block_type = pd->settings.block_mode; | |
1729 | ||
1730 | wp->multi_session = 0; | |
1731 | ||
1732 | #ifdef PACKET_USE_LS | |
1733 | wp->link_size = 7; | |
1734 | wp->ls_v = 1; | |
1735 | #endif | |
1736 | ||
1737 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1738 | wp->session_format = 0; | |
1739 | wp->subhdr2 = 0x20; | |
1740 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1741 | wp->session_format = 0x20; | |
1742 | wp->subhdr2 = 8; | |
1743 | #if 0 | |
1744 | wp->mcn[0] = 0x80; | |
1745 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1746 | #endif | |
1747 | } else { | |
1748 | /* | |
1749 | * paranoia | |
1750 | */ | |
fa63c0ab | 1751 | pkt_err(pd, "write mode wrong %d\n", wp->data_block_type); |
1da177e4 LT |
1752 | return 1; |
1753 | } | |
1754 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1755 | ||
1756 | cgc.buflen = cgc.cmd[8] = size; | |
1757 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
1758 | pkt_dump_sense(&cgc); | |
1759 | return ret; | |
1760 | } | |
1761 | ||
1762 | pkt_print_settings(pd); | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | /* | |
7c613d59 | 1767 | * 1 -- we can write to this track, 0 -- we can't |
1da177e4 | 1768 | */ |
ab863ec3 | 1769 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
1da177e4 | 1770 | { |
ab863ec3 PO |
1771 | switch (pd->mmc3_profile) { |
1772 | case 0x1a: /* DVD+RW */ | |
1773 | case 0x12: /* DVD-RAM */ | |
1774 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1775 | return 1; | |
1776 | default: | |
1777 | break; | |
1778 | } | |
1da177e4 | 1779 | |
ab863ec3 PO |
1780 | if (!ti->packet || !ti->fp) |
1781 | return 0; | |
1da177e4 LT |
1782 | |
1783 | /* | |
1784 | * "good" settings as per Mt Fuji. | |
1785 | */ | |
ab863ec3 | 1786 | if (ti->rt == 0 && ti->blank == 0) |
7c613d59 | 1787 | return 1; |
1da177e4 | 1788 | |
ab863ec3 | 1789 | if (ti->rt == 0 && ti->blank == 1) |
7c613d59 | 1790 | return 1; |
1da177e4 | 1791 | |
ab863ec3 | 1792 | if (ti->rt == 1 && ti->blank == 0) |
7c613d59 | 1793 | return 1; |
1da177e4 | 1794 | |
fa63c0ab | 1795 | pkt_err(pd, "bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
7c613d59 | 1796 | return 0; |
1da177e4 LT |
1797 | } |
1798 | ||
1799 | /* | |
7c613d59 | 1800 | * 1 -- we can write to this disc, 0 -- we can't |
1da177e4 | 1801 | */ |
7c613d59 | 1802 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
1da177e4 LT |
1803 | { |
1804 | switch (pd->mmc3_profile) { | |
1805 | case 0x0a: /* CD-RW */ | |
1806 | case 0xffff: /* MMC3 not supported */ | |
1807 | break; | |
1808 | case 0x1a: /* DVD+RW */ | |
1809 | case 0x13: /* DVD-RW */ | |
1810 | case 0x12: /* DVD-RAM */ | |
7c613d59 | 1811 | return 1; |
1da177e4 | 1812 | default: |
844aa797 | 1813 | pkt_dbg(2, pd, "Wrong disc profile (%x)\n", |
cd3f2cd0 | 1814 | pd->mmc3_profile); |
7c613d59 | 1815 | return 0; |
1da177e4 LT |
1816 | } |
1817 | ||
1818 | /* | |
1819 | * for disc type 0xff we should probably reserve a new track. | |
1820 | * but i'm not sure, should we leave this to user apps? probably. | |
1821 | */ | |
1822 | if (di->disc_type == 0xff) { | |
ca73dabc | 1823 | pkt_notice(pd, "unknown disc - no track?\n"); |
7c613d59 | 1824 | return 0; |
1da177e4 LT |
1825 | } |
1826 | ||
1827 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
fa63c0ab | 1828 | pkt_err(pd, "wrong disc type (%x)\n", di->disc_type); |
7c613d59 | 1829 | return 0; |
1da177e4 LT |
1830 | } |
1831 | ||
1832 | if (di->erasable == 0) { | |
ca73dabc | 1833 | pkt_notice(pd, "disc not erasable\n"); |
7c613d59 | 1834 | return 0; |
1da177e4 LT |
1835 | } |
1836 | ||
1837 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
fa63c0ab | 1838 | pkt_err(pd, "can't write to last track (reserved)\n"); |
7c613d59 | 1839 | return 0; |
1da177e4 LT |
1840 | } |
1841 | ||
7c613d59 | 1842 | return 1; |
1da177e4 LT |
1843 | } |
1844 | ||
05680d86 | 1845 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
1da177e4 LT |
1846 | { |
1847 | struct packet_command cgc; | |
1848 | unsigned char buf[12]; | |
1849 | disc_information di; | |
1850 | track_information ti; | |
1851 | int ret, track; | |
1852 | ||
1853 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
1854 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
1855 | cgc.cmd[8] = 8; | |
1856 | ret = pkt_generic_packet(pd, &cgc); | |
1857 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
1858 | ||
1859 | memset(&di, 0, sizeof(disc_information)); | |
1860 | memset(&ti, 0, sizeof(track_information)); | |
1861 | ||
1862 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
fa63c0ab | 1863 | pkt_err(pd, "failed get_disc\n"); |
1da177e4 LT |
1864 | return ret; |
1865 | } | |
1866 | ||
7c613d59 | 1867 | if (!pkt_writable_disc(pd, &di)) |
9db91546 | 1868 | return -EROFS; |
1da177e4 | 1869 | |
1da177e4 LT |
1870 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
1871 | ||
1872 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
1873 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
fa63c0ab | 1874 | pkt_err(pd, "failed get_track\n"); |
1da177e4 LT |
1875 | return ret; |
1876 | } | |
1877 | ||
ab863ec3 | 1878 | if (!pkt_writable_track(pd, &ti)) { |
fa63c0ab | 1879 | pkt_err(pd, "can't write to this track\n"); |
9db91546 | 1880 | return -EROFS; |
1da177e4 LT |
1881 | } |
1882 | ||
1883 | /* | |
1884 | * we keep packet size in 512 byte units, makes it easier to | |
1885 | * deal with request calculations. | |
1886 | */ | |
1887 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
1888 | if (pd->settings.size == 0) { | |
ca73dabc | 1889 | pkt_notice(pd, "detected zero packet size!\n"); |
a460ad62 | 1890 | return -ENXIO; |
1da177e4 | 1891 | } |
d0272e78 | 1892 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
fa63c0ab | 1893 | pkt_err(pd, "packet size is too big\n"); |
9db91546 | 1894 | return -EROFS; |
d0272e78 | 1895 | } |
1da177e4 LT |
1896 | pd->settings.fp = ti.fp; |
1897 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
1898 | ||
1899 | if (ti.nwa_v) { | |
1900 | pd->nwa = be32_to_cpu(ti.next_writable); | |
1901 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * in theory we could use lra on -RW media as well and just zero | |
1906 | * blocks that haven't been written yet, but in practice that | |
1907 | * is just a no-go. we'll use that for -R, naturally. | |
1908 | */ | |
1909 | if (ti.lra_v) { | |
1910 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
1911 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1912 | } else { | |
1913 | pd->lra = 0xffffffff; | |
1914 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
1915 | } | |
1916 | ||
1917 | /* | |
1918 | * fine for now | |
1919 | */ | |
1920 | pd->settings.link_loss = 7; | |
1921 | pd->settings.write_type = 0; /* packet */ | |
1922 | pd->settings.track_mode = ti.track_mode; | |
1923 | ||
1924 | /* | |
1925 | * mode1 or mode2 disc | |
1926 | */ | |
1927 | switch (ti.data_mode) { | |
1928 | case PACKET_MODE1: | |
1929 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
1930 | break; | |
1931 | case PACKET_MODE2: | |
1932 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
1933 | break; | |
1934 | default: | |
fa63c0ab | 1935 | pkt_err(pd, "unknown data mode\n"); |
9db91546 | 1936 | return -EROFS; |
1da177e4 LT |
1937 | } |
1938 | return 0; | |
1939 | } | |
1940 | ||
1941 | /* | |
1942 | * enable/disable write caching on drive | |
1943 | */ | |
05680d86 PO |
1944 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
1945 | int set) | |
1da177e4 LT |
1946 | { |
1947 | struct packet_command cgc; | |
1948 | struct request_sense sense; | |
1949 | unsigned char buf[64]; | |
1950 | int ret; | |
1951 | ||
1da177e4 LT |
1952 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
1953 | cgc.sense = &sense; | |
1954 | cgc.buflen = pd->mode_offset + 12; | |
1955 | ||
1956 | /* | |
1957 | * caching mode page might not be there, so quiet this command | |
1958 | */ | |
1959 | cgc.quiet = 1; | |
1960 | ||
1961 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
1962 | return ret; | |
1963 | ||
1964 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
1965 | ||
1966 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
1967 | ret = pkt_mode_select(pd, &cgc); | |
1968 | if (ret) { | |
fa63c0ab | 1969 | pkt_err(pd, "write caching control failed\n"); |
1da177e4 LT |
1970 | pkt_dump_sense(&cgc); |
1971 | } else if (!ret && set) | |
ca73dabc | 1972 | pkt_notice(pd, "enabled write caching\n"); |
1da177e4 LT |
1973 | return ret; |
1974 | } | |
1975 | ||
1976 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
1977 | { | |
1978 | struct packet_command cgc; | |
1979 | ||
1980 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
1981 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
1982 | cgc.cmd[4] = lockflag ? 1 : 0; | |
1983 | return pkt_generic_packet(pd, &cgc); | |
1984 | } | |
1985 | ||
1986 | /* | |
1987 | * Returns drive maximum write speed | |
1988 | */ | |
05680d86 PO |
1989 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
1990 | unsigned *write_speed) | |
1da177e4 LT |
1991 | { |
1992 | struct packet_command cgc; | |
1993 | struct request_sense sense; | |
1994 | unsigned char buf[256+18]; | |
1995 | unsigned char *cap_buf; | |
1996 | int ret, offset; | |
1997 | ||
1da177e4 LT |
1998 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
1999 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
2000 | cgc.sense = &sense; | |
2001 | ||
2002 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2003 | if (ret) { | |
2004 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
2005 | sizeof(struct mode_page_header); | |
2006 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2007 | if (ret) { | |
2008 | pkt_dump_sense(&cgc); | |
2009 | return ret; | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | offset = 20; /* Obsoleted field, used by older drives */ | |
2014 | if (cap_buf[1] >= 28) | |
2015 | offset = 28; /* Current write speed selected */ | |
2016 | if (cap_buf[1] >= 30) { | |
2017 | /* If the drive reports at least one "Logical Unit Write | |
2018 | * Speed Performance Descriptor Block", use the information | |
2019 | * in the first block. (contains the highest speed) | |
2020 | */ | |
2021 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
2022 | if (num_spdb > 0) | |
2023 | offset = 34; | |
2024 | } | |
2025 | ||
2026 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
2027 | return 0; | |
2028 | } | |
2029 | ||
2030 | /* These tables from cdrecord - I don't have orange book */ | |
2031 | /* standard speed CD-RW (1-4x) */ | |
2032 | static char clv_to_speed[16] = { | |
2033 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2034 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2035 | }; | |
2036 | /* high speed CD-RW (-10x) */ | |
2037 | static char hs_clv_to_speed[16] = { | |
2038 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2039 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2040 | }; | |
2041 | /* ultra high speed CD-RW */ | |
2042 | static char us_clv_to_speed[16] = { | |
2043 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2044 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2045 | }; | |
2046 | ||
2047 | /* | |
2048 | * reads the maximum media speed from ATIP | |
2049 | */ | |
05680d86 PO |
2050 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
2051 | unsigned *speed) | |
1da177e4 LT |
2052 | { |
2053 | struct packet_command cgc; | |
2054 | struct request_sense sense; | |
2055 | unsigned char buf[64]; | |
2056 | unsigned int size, st, sp; | |
2057 | int ret; | |
2058 | ||
2059 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2060 | cgc.sense = &sense; | |
2061 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2062 | cgc.cmd[1] = 2; | |
2063 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2064 | cgc.cmd[8] = 2; | |
2065 | ret = pkt_generic_packet(pd, &cgc); | |
2066 | if (ret) { | |
2067 | pkt_dump_sense(&cgc); | |
2068 | return ret; | |
2069 | } | |
2070 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2071 | if (size > sizeof(buf)) | |
2072 | size = sizeof(buf); | |
2073 | ||
2074 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2075 | cgc.sense = &sense; | |
2076 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2077 | cgc.cmd[1] = 2; | |
2078 | cgc.cmd[2] = 4; | |
2079 | cgc.cmd[8] = size; | |
2080 | ret = pkt_generic_packet(pd, &cgc); | |
2081 | if (ret) { | |
2082 | pkt_dump_sense(&cgc); | |
2083 | return ret; | |
2084 | } | |
2085 | ||
eaa0ff15 | 2086 | if (!(buf[6] & 0x40)) { |
ca73dabc | 2087 | pkt_notice(pd, "disc type is not CD-RW\n"); |
1da177e4 LT |
2088 | return 1; |
2089 | } | |
eaa0ff15 | 2090 | if (!(buf[6] & 0x4)) { |
ca73dabc | 2091 | pkt_notice(pd, "A1 values on media are not valid, maybe not CDRW?\n"); |
1da177e4 LT |
2092 | return 1; |
2093 | } | |
2094 | ||
2095 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2096 | ||
2097 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2098 | ||
2099 | /* Info from cdrecord */ | |
2100 | switch (st) { | |
2101 | case 0: /* standard speed */ | |
2102 | *speed = clv_to_speed[sp]; | |
2103 | break; | |
2104 | case 1: /* high speed */ | |
2105 | *speed = hs_clv_to_speed[sp]; | |
2106 | break; | |
2107 | case 2: /* ultra high speed */ | |
2108 | *speed = us_clv_to_speed[sp]; | |
2109 | break; | |
2110 | default: | |
ca73dabc | 2111 | pkt_notice(pd, "unknown disc sub-type %d\n", st); |
1da177e4 LT |
2112 | return 1; |
2113 | } | |
2114 | if (*speed) { | |
99481334 | 2115 | pr_info("maximum media speed: %d\n", *speed); |
1da177e4 LT |
2116 | return 0; |
2117 | } else { | |
ca73dabc | 2118 | pkt_notice(pd, "unknown speed %d for sub-type %d\n", sp, st); |
1da177e4 LT |
2119 | return 1; |
2120 | } | |
2121 | } | |
2122 | ||
05680d86 | 2123 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
1da177e4 LT |
2124 | { |
2125 | struct packet_command cgc; | |
2126 | struct request_sense sense; | |
2127 | int ret; | |
2128 | ||
844aa797 | 2129 | pkt_dbg(2, pd, "Performing OPC\n"); |
1da177e4 LT |
2130 | |
2131 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2132 | cgc.sense = &sense; | |
2133 | cgc.timeout = 60*HZ; | |
2134 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2135 | cgc.cmd[1] = 1; | |
2136 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
2137 | pkt_dump_sense(&cgc); | |
2138 | return ret; | |
2139 | } | |
2140 | ||
2141 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2142 | { | |
2143 | int ret; | |
2144 | unsigned int write_speed, media_write_speed, read_speed; | |
2145 | ||
2146 | if ((ret = pkt_probe_settings(pd))) { | |
844aa797 | 2147 | pkt_dbg(2, pd, "failed probe\n"); |
9db91546 | 2148 | return ret; |
1da177e4 LT |
2149 | } |
2150 | ||
2151 | if ((ret = pkt_set_write_settings(pd))) { | |
844aa797 | 2152 | pkt_dbg(1, pd, "failed saving write settings\n"); |
1da177e4 LT |
2153 | return -EIO; |
2154 | } | |
2155 | ||
2156 | pkt_write_caching(pd, USE_WCACHING); | |
2157 | ||
2158 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2159 | write_speed = 16 * 177; | |
2160 | switch (pd->mmc3_profile) { | |
2161 | case 0x13: /* DVD-RW */ | |
2162 | case 0x1a: /* DVD+RW */ | |
2163 | case 0x12: /* DVD-RAM */ | |
844aa797 | 2164 | pkt_dbg(1, pd, "write speed %ukB/s\n", write_speed); |
1da177e4 LT |
2165 | break; |
2166 | default: | |
2167 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2168 | media_write_speed = 16; | |
2169 | write_speed = min(write_speed, media_write_speed * 177); | |
844aa797 | 2170 | pkt_dbg(1, pd, "write speed %ux\n", write_speed / 176); |
1da177e4 LT |
2171 | break; |
2172 | } | |
2173 | read_speed = write_speed; | |
2174 | ||
2175 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
844aa797 | 2176 | pkt_dbg(1, pd, "couldn't set write speed\n"); |
1da177e4 LT |
2177 | return -EIO; |
2178 | } | |
2179 | pd->write_speed = write_speed; | |
2180 | pd->read_speed = read_speed; | |
2181 | ||
2182 | if ((ret = pkt_perform_opc(pd))) { | |
844aa797 | 2183 | pkt_dbg(1, pd, "Optimum Power Calibration failed\n"); |
1da177e4 LT |
2184 | } |
2185 | ||
2186 | return 0; | |
2187 | } | |
2188 | ||
2189 | /* | |
2190 | * called at open time. | |
2191 | */ | |
aeb5d727 | 2192 | static int pkt_open_dev(struct pktcdvd_device *pd, fmode_t write) |
1da177e4 LT |
2193 | { |
2194 | int ret; | |
2195 | long lba; | |
165125e1 | 2196 | struct request_queue *q; |
1da177e4 LT |
2197 | |
2198 | /* | |
2199 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2200 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2201 | * so bdget() can't fail. | |
2202 | */ | |
2203 | bdget(pd->bdev->bd_dev); | |
e525fd89 | 2204 | if ((ret = blkdev_get(pd->bdev, FMODE_READ | FMODE_EXCL, pd))) |
1da177e4 LT |
2205 | goto out; |
2206 | ||
2207 | if ((ret = pkt_get_last_written(pd, &lba))) { | |
fa63c0ab | 2208 | pkt_err(pd, "pkt_get_last_written failed\n"); |
e525fd89 | 2209 | goto out_putdev; |
1da177e4 LT |
2210 | } |
2211 | ||
2212 | set_capacity(pd->disk, lba << 2); | |
2213 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2214 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2215 | ||
2216 | q = bdev_get_queue(pd->bdev); | |
2217 | if (write) { | |
2218 | if ((ret = pkt_open_write(pd))) | |
e525fd89 | 2219 | goto out_putdev; |
1da177e4 LT |
2220 | /* |
2221 | * Some CDRW drives can not handle writes larger than one packet, | |
2222 | * even if the size is a multiple of the packet size. | |
2223 | */ | |
2224 | spin_lock_irq(q->queue_lock); | |
086fa5ff | 2225 | blk_queue_max_hw_sectors(q, pd->settings.size); |
1da177e4 LT |
2226 | spin_unlock_irq(q->queue_lock); |
2227 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2228 | } else { | |
2229 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2230 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2231 | } | |
2232 | ||
2233 | if ((ret = pkt_set_segment_merging(pd, q))) | |
e525fd89 | 2234 | goto out_putdev; |
1da177e4 | 2235 | |
e1bc89bc PO |
2236 | if (write) { |
2237 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
fa63c0ab | 2238 | pkt_err(pd, "not enough memory for buffers\n"); |
e1bc89bc | 2239 | ret = -ENOMEM; |
e525fd89 | 2240 | goto out_putdev; |
e1bc89bc | 2241 | } |
99481334 | 2242 | pr_info("%lukB available on disc\n", lba << 1); |
e1bc89bc | 2243 | } |
1da177e4 LT |
2244 | |
2245 | return 0; | |
2246 | ||
2247 | out_putdev: | |
e525fd89 | 2248 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
1da177e4 LT |
2249 | out: |
2250 | return ret; | |
2251 | } | |
2252 | ||
2253 | /* | |
2254 | * called when the device is closed. makes sure that the device flushes | |
2255 | * the internal cache before we close. | |
2256 | */ | |
2257 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2258 | { | |
2259 | if (flush && pkt_flush_cache(pd)) | |
844aa797 | 2260 | pkt_dbg(1, pd, "not flushing cache\n"); |
1da177e4 LT |
2261 | |
2262 | pkt_lock_door(pd, 0); | |
2263 | ||
2264 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
e525fd89 | 2265 | blkdev_put(pd->bdev, FMODE_READ | FMODE_EXCL); |
e1bc89bc PO |
2266 | |
2267 | pkt_shrink_pktlist(pd); | |
1da177e4 LT |
2268 | } |
2269 | ||
252a52aa | 2270 | static struct pktcdvd_device *pkt_find_dev_from_minor(unsigned int dev_minor) |
1da177e4 LT |
2271 | { |
2272 | if (dev_minor >= MAX_WRITERS) | |
2273 | return NULL; | |
2274 | return pkt_devs[dev_minor]; | |
2275 | } | |
2276 | ||
5e5e007c | 2277 | static int pkt_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
2278 | { |
2279 | struct pktcdvd_device *pd = NULL; | |
2280 | int ret; | |
2281 | ||
2a48fc0a | 2282 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2283 | mutex_lock(&ctl_mutex); |
5e5e007c | 2284 | pd = pkt_find_dev_from_minor(MINOR(bdev->bd_dev)); |
1da177e4 LT |
2285 | if (!pd) { |
2286 | ret = -ENODEV; | |
2287 | goto out; | |
2288 | } | |
2289 | BUG_ON(pd->refcnt < 0); | |
2290 | ||
2291 | pd->refcnt++; | |
46f4e1b7 | 2292 | if (pd->refcnt > 1) { |
5e5e007c | 2293 | if ((mode & FMODE_WRITE) && |
46f4e1b7 PO |
2294 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
2295 | ret = -EBUSY; | |
2296 | goto out_dec; | |
2297 | } | |
2298 | } else { | |
5e5e007c | 2299 | ret = pkt_open_dev(pd, mode & FMODE_WRITE); |
01fd9fda | 2300 | if (ret) |
1da177e4 | 2301 | goto out_dec; |
1da177e4 LT |
2302 | /* |
2303 | * needed here as well, since ext2 (among others) may change | |
2304 | * the blocksize at mount time | |
2305 | */ | |
5e5e007c | 2306 | set_blocksize(bdev, CD_FRAMESIZE); |
1da177e4 LT |
2307 | } |
2308 | ||
1657f824 | 2309 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2310 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2311 | return 0; |
2312 | ||
2313 | out_dec: | |
2314 | pd->refcnt--; | |
2315 | out: | |
1657f824 | 2316 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2317 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2318 | return ret; |
2319 | } | |
2320 | ||
db2a144b | 2321 | static void pkt_close(struct gendisk *disk, fmode_t mode) |
1da177e4 | 2322 | { |
5e5e007c | 2323 | struct pktcdvd_device *pd = disk->private_data; |
1da177e4 | 2324 | |
2a48fc0a | 2325 | mutex_lock(&pktcdvd_mutex); |
1657f824 | 2326 | mutex_lock(&ctl_mutex); |
1da177e4 LT |
2327 | pd->refcnt--; |
2328 | BUG_ON(pd->refcnt < 0); | |
2329 | if (pd->refcnt == 0) { | |
2330 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2331 | pkt_release_dev(pd, flush); | |
2332 | } | |
1657f824 | 2333 | mutex_unlock(&ctl_mutex); |
2a48fc0a | 2334 | mutex_unlock(&pktcdvd_mutex); |
1da177e4 LT |
2335 | } |
2336 | ||
2337 | ||
6712ecf8 | 2338 | static void pkt_end_io_read_cloned(struct bio *bio, int err) |
1da177e4 LT |
2339 | { |
2340 | struct packet_stacked_data *psd = bio->bi_private; | |
2341 | struct pktcdvd_device *pd = psd->pd; | |
2342 | ||
1da177e4 | 2343 | bio_put(bio); |
6712ecf8 | 2344 | bio_endio(psd->bio, err); |
1da177e4 LT |
2345 | mempool_free(psd, psd_pool); |
2346 | pkt_bio_finished(pd); | |
1da177e4 LT |
2347 | } |
2348 | ||
5a7bbad2 | 2349 | static void pkt_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 LT |
2350 | { |
2351 | struct pktcdvd_device *pd; | |
2352 | char b[BDEVNAME_SIZE]; | |
2353 | sector_t zone; | |
2354 | struct packet_data *pkt; | |
2355 | int was_empty, blocked_bio; | |
2356 | struct pkt_rb_node *node; | |
2357 | ||
2358 | pd = q->queuedata; | |
2359 | if (!pd) { | |
fa63c0ab JP |
2360 | pkt_err(pd, "%s incorrect request queue\n", |
2361 | bdevname(bio->bi_bdev, b)); | |
1da177e4 LT |
2362 | goto end_io; |
2363 | } | |
2364 | ||
2365 | /* | |
2366 | * Clone READ bios so we can have our own bi_end_io callback. | |
2367 | */ | |
2368 | if (bio_data_dir(bio) == READ) { | |
2369 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); | |
2370 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2371 | ||
2372 | psd->pd = pd; | |
2373 | psd->bio = bio; | |
2374 | cloned_bio->bi_bdev = pd->bdev; | |
2375 | cloned_bio->bi_private = psd; | |
2376 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
aa8b57aa | 2377 | pd->stats.secs_r += bio_sectors(bio); |
46c271be | 2378 | pkt_queue_bio(pd, cloned_bio); |
5a7bbad2 | 2379 | return; |
1da177e4 LT |
2380 | } |
2381 | ||
2382 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
ca73dabc JP |
2383 | pkt_notice(pd, "WRITE for ro device (%llu)\n", |
2384 | (unsigned long long)bio->bi_sector); | |
1da177e4 LT |
2385 | goto end_io; |
2386 | } | |
2387 | ||
2388 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { | |
fa63c0ab | 2389 | pkt_err(pd, "wrong bio size\n"); |
1da177e4 LT |
2390 | goto end_io; |
2391 | } | |
2392 | ||
2393 | blk_queue_bounce(q, &bio); | |
2394 | ||
5323fb77 | 2395 | zone = get_zone(bio->bi_sector, pd); |
844aa797 | 2396 | pkt_dbg(2, pd, "start = %6llx stop = %6llx\n", |
1da177e4 | 2397 | (unsigned long long)bio->bi_sector, |
f73a1c7d | 2398 | (unsigned long long)bio_end_sector(bio)); |
1da177e4 LT |
2399 | |
2400 | /* Check if we have to split the bio */ | |
2401 | { | |
2402 | struct bio_pair *bp; | |
2403 | sector_t last_zone; | |
2404 | int first_sectors; | |
2405 | ||
5323fb77 | 2406 | last_zone = get_zone(bio_end_sector(bio) - 1, pd); |
1da177e4 LT |
2407 | if (last_zone != zone) { |
2408 | BUG_ON(last_zone != zone + pd->settings.size); | |
2409 | first_sectors = last_zone - bio->bi_sector; | |
6feef531 | 2410 | bp = bio_split(bio, first_sectors); |
1da177e4 LT |
2411 | BUG_ON(!bp); |
2412 | pkt_make_request(q, &bp->bio1); | |
2413 | pkt_make_request(q, &bp->bio2); | |
2414 | bio_pair_release(bp); | |
5a7bbad2 | 2415 | return; |
1da177e4 LT |
2416 | } |
2417 | } | |
2418 | ||
2419 | /* | |
2420 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2421 | * just append this bio to that packet. | |
2422 | */ | |
2423 | spin_lock(&pd->cdrw.active_list_lock); | |
2424 | blocked_bio = 0; | |
2425 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2426 | if (pkt->sector == zone) { | |
2427 | spin_lock(&pkt->lock); | |
2428 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2429 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
c5ecc484 | 2430 | bio_list_add(&pkt->orig_bios, bio); |
1da177e4 LT |
2431 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
2432 | if ((pkt->write_size >= pkt->frames) && | |
2433 | (pkt->state == PACKET_WAITING_STATE)) { | |
2434 | atomic_inc(&pkt->run_sm); | |
2435 | wake_up(&pd->wqueue); | |
2436 | } | |
2437 | spin_unlock(&pkt->lock); | |
2438 | spin_unlock(&pd->cdrw.active_list_lock); | |
5a7bbad2 | 2439 | return; |
1da177e4 LT |
2440 | } else { |
2441 | blocked_bio = 1; | |
2442 | } | |
2443 | spin_unlock(&pkt->lock); | |
2444 | } | |
2445 | } | |
2446 | spin_unlock(&pd->cdrw.active_list_lock); | |
2447 | ||
0a0fc960 TM |
2448 | /* |
2449 | * Test if there is enough room left in the bio work queue | |
2450 | * (queue size >= congestion on mark). | |
2451 | * If not, wait till the work queue size is below the congestion off mark. | |
2452 | */ | |
2453 | spin_lock(&pd->lock); | |
2454 | if (pd->write_congestion_on > 0 | |
2455 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
8aa7e847 | 2456 | set_bdi_congested(&q->backing_dev_info, BLK_RW_ASYNC); |
0a0fc960 TM |
2457 | do { |
2458 | spin_unlock(&pd->lock); | |
8aa7e847 | 2459 | congestion_wait(BLK_RW_ASYNC, HZ); |
0a0fc960 TM |
2460 | spin_lock(&pd->lock); |
2461 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2462 | } | |
2463 | spin_unlock(&pd->lock); | |
2464 | ||
1da177e4 LT |
2465 | /* |
2466 | * No matching packet found. Store the bio in the work queue. | |
2467 | */ | |
2468 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
1da177e4 LT |
2469 | node->bio = bio; |
2470 | spin_lock(&pd->lock); | |
2471 | BUG_ON(pd->bio_queue_size < 0); | |
2472 | was_empty = (pd->bio_queue_size == 0); | |
2473 | pkt_rbtree_insert(pd, node); | |
2474 | spin_unlock(&pd->lock); | |
2475 | ||
2476 | /* | |
2477 | * Wake up the worker thread. | |
2478 | */ | |
2479 | atomic_set(&pd->scan_queue, 1); | |
2480 | if (was_empty) { | |
2481 | /* This wake_up is required for correct operation */ | |
2482 | wake_up(&pd->wqueue); | |
2483 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2484 | /* | |
2485 | * This wake up is not required for correct operation, | |
2486 | * but improves performance in some cases. | |
2487 | */ | |
2488 | wake_up(&pd->wqueue); | |
2489 | } | |
5a7bbad2 | 2490 | return; |
1da177e4 | 2491 | end_io: |
6712ecf8 | 2492 | bio_io_error(bio); |
1da177e4 LT |
2493 | } |
2494 | ||
2495 | ||
2496 | ||
cc371e66 AK |
2497 | static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
2498 | struct bio_vec *bvec) | |
1da177e4 LT |
2499 | { |
2500 | struct pktcdvd_device *pd = q->queuedata; | |
5323fb77 | 2501 | sector_t zone = get_zone(bmd->bi_sector, pd); |
cc371e66 | 2502 | int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; |
1da177e4 LT |
2503 | int remaining = (pd->settings.size << 9) - used; |
2504 | int remaining2; | |
2505 | ||
2506 | /* | |
2507 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2508 | * boundary, pkt_make_request() will split the bio. | |
2509 | */ | |
cc371e66 | 2510 | remaining2 = PAGE_SIZE - bmd->bi_size; |
1da177e4 LT |
2511 | remaining = max(remaining, remaining2); |
2512 | ||
2513 | BUG_ON(remaining < 0); | |
2514 | return remaining; | |
2515 | } | |
2516 | ||
2517 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2518 | { | |
165125e1 | 2519 | struct request_queue *q = pd->disk->queue; |
1da177e4 LT |
2520 | |
2521 | blk_queue_make_request(q, pkt_make_request); | |
e1defc4f | 2522 | blk_queue_logical_block_size(q, CD_FRAMESIZE); |
086fa5ff | 2523 | blk_queue_max_hw_sectors(q, PACKET_MAX_SECTORS); |
1da177e4 LT |
2524 | blk_queue_merge_bvec(q, pkt_merge_bvec); |
2525 | q->queuedata = pd; | |
2526 | } | |
2527 | ||
2528 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2529 | { | |
2530 | struct pktcdvd_device *pd = m->private; | |
2531 | char *msg; | |
2532 | char bdev_buf[BDEVNAME_SIZE]; | |
2533 | int states[PACKET_NUM_STATES]; | |
2534 | ||
2535 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2536 | bdevname(pd->bdev, bdev_buf)); | |
2537 | ||
2538 | seq_printf(m, "\nSettings:\n"); | |
2539 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2540 | ||
2541 | if (pd->settings.write_type == 0) | |
2542 | msg = "Packet"; | |
2543 | else | |
2544 | msg = "Unknown"; | |
2545 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2546 | ||
2547 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2548 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2549 | ||
2550 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2551 | ||
2552 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2553 | msg = "Mode 1"; | |
2554 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2555 | msg = "Mode 2"; | |
2556 | else | |
2557 | msg = "Unknown"; | |
2558 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2559 | ||
2560 | seq_printf(m, "\nStatistics:\n"); | |
2561 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2562 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2563 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2564 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2565 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2566 | ||
2567 | seq_printf(m, "\nMisc:\n"); | |
2568 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2569 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2570 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2571 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2572 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2573 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2574 | ||
2575 | seq_printf(m, "\nQueue state:\n"); | |
2576 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2577 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2578 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2579 | ||
2580 | pkt_count_states(pd, states); | |
2581 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2582 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2583 | ||
0a0fc960 TM |
2584 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
2585 | pd->write_congestion_off, | |
2586 | pd->write_congestion_on); | |
1da177e4 LT |
2587 | return 0; |
2588 | } | |
2589 | ||
2590 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2591 | { | |
d9dda78b | 2592 | return single_open(file, pkt_seq_show, PDE_DATA(inode)); |
1da177e4 LT |
2593 | } |
2594 | ||
2b8693c0 | 2595 | static const struct file_operations pkt_proc_fops = { |
1da177e4 LT |
2596 | .open = pkt_seq_open, |
2597 | .read = seq_read, | |
2598 | .llseek = seq_lseek, | |
2599 | .release = single_release | |
2600 | }; | |
2601 | ||
2602 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2603 | { | |
2604 | int i; | |
2605 | int ret = 0; | |
2606 | char b[BDEVNAME_SIZE]; | |
1da177e4 LT |
2607 | struct block_device *bdev; |
2608 | ||
2609 | if (pd->pkt_dev == dev) { | |
fa63c0ab | 2610 | pkt_err(pd, "recursive setup not allowed\n"); |
1da177e4 LT |
2611 | return -EBUSY; |
2612 | } | |
2613 | for (i = 0; i < MAX_WRITERS; i++) { | |
2614 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2615 | if (!pd2) | |
2616 | continue; | |
2617 | if (pd2->bdev->bd_dev == dev) { | |
fa63c0ab JP |
2618 | pkt_err(pd, "%s already setup\n", |
2619 | bdevname(pd2->bdev, b)); | |
1da177e4 LT |
2620 | return -EBUSY; |
2621 | } | |
2622 | if (pd2->pkt_dev == dev) { | |
fa63c0ab | 2623 | pkt_err(pd, "can't chain pktcdvd devices\n"); |
1da177e4 LT |
2624 | return -EBUSY; |
2625 | } | |
2626 | } | |
2627 | ||
2628 | bdev = bdget(dev); | |
2629 | if (!bdev) | |
2630 | return -ENOMEM; | |
e525fd89 | 2631 | ret = blkdev_get(bdev, FMODE_READ | FMODE_NDELAY, NULL); |
1da177e4 LT |
2632 | if (ret) |
2633 | return ret; | |
2634 | ||
2635 | /* This is safe, since we have a reference from open(). */ | |
2636 | __module_get(THIS_MODULE); | |
2637 | ||
1da177e4 LT |
2638 | pd->bdev = bdev; |
2639 | set_blocksize(bdev, CD_FRAMESIZE); | |
2640 | ||
2641 | pkt_init_queue(pd); | |
2642 | ||
2643 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2644 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2645 | if (IS_ERR(pd->cdrw.thread)) { | |
fa63c0ab | 2646 | pkt_err(pd, "can't start kernel thread\n"); |
1da177e4 | 2647 | ret = -ENOMEM; |
e1bc89bc | 2648 | goto out_mem; |
1da177e4 LT |
2649 | } |
2650 | ||
c7705f34 | 2651 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
844aa797 | 2652 | pkt_dbg(1, pd, "writer mapped to %s\n", bdevname(bdev, b)); |
1da177e4 LT |
2653 | return 0; |
2654 | ||
1da177e4 | 2655 | out_mem: |
2cbed890 | 2656 | blkdev_put(bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 LT |
2657 | /* This is safe: open() is still holding a reference. */ |
2658 | module_put(THIS_MODULE); | |
2659 | return ret; | |
2660 | } | |
2661 | ||
5e5e007c | 2662 | static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) |
1da177e4 | 2663 | { |
5e5e007c | 2664 | struct pktcdvd_device *pd = bdev->bd_disk->private_data; |
8a6cfeb6 | 2665 | int ret; |
1da177e4 | 2666 | |
844aa797 | 2667 | pkt_dbg(2, pd, "cmd %x, dev %d:%d\n", |
cd3f2cd0 | 2668 | cmd, MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev)); |
1da177e4 | 2669 | |
2a48fc0a | 2670 | mutex_lock(&pktcdvd_mutex); |
1da177e4 | 2671 | switch (cmd) { |
a0eb62a0 AV |
2672 | case CDROMEJECT: |
2673 | /* | |
2674 | * The door gets locked when the device is opened, so we | |
2675 | * have to unlock it or else the eject command fails. | |
2676 | */ | |
2677 | if (pd->refcnt == 1) | |
2678 | pkt_lock_door(pd, 0); | |
2679 | /* fallthru */ | |
1da177e4 LT |
2680 | /* |
2681 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2682 | */ | |
2683 | case CDROMMULTISESSION: | |
2684 | case CDROMREADTOCENTRY: | |
2685 | case CDROM_LAST_WRITTEN: | |
2686 | case CDROM_SEND_PACKET: | |
2687 | case SCSI_IOCTL_SEND_COMMAND: | |
8a6cfeb6 AB |
2688 | ret = __blkdev_driver_ioctl(pd->bdev, mode, cmd, arg); |
2689 | break; | |
1da177e4 LT |
2690 | |
2691 | default: | |
844aa797 | 2692 | pkt_dbg(2, pd, "Unknown ioctl (%x)\n", cmd); |
8a6cfeb6 | 2693 | ret = -ENOTTY; |
1da177e4 | 2694 | } |
2a48fc0a | 2695 | mutex_unlock(&pktcdvd_mutex); |
8560c650 | 2696 | |
8a6cfeb6 | 2697 | return ret; |
1da177e4 LT |
2698 | } |
2699 | ||
3c0d2060 TH |
2700 | static unsigned int pkt_check_events(struct gendisk *disk, |
2701 | unsigned int clearing) | |
1da177e4 LT |
2702 | { |
2703 | struct pktcdvd_device *pd = disk->private_data; | |
2704 | struct gendisk *attached_disk; | |
2705 | ||
2706 | if (!pd) | |
2707 | return 0; | |
2708 | if (!pd->bdev) | |
2709 | return 0; | |
2710 | attached_disk = pd->bdev->bd_disk; | |
3c0d2060 | 2711 | if (!attached_disk || !attached_disk->fops->check_events) |
1da177e4 | 2712 | return 0; |
3c0d2060 | 2713 | return attached_disk->fops->check_events(attached_disk, clearing); |
1da177e4 LT |
2714 | } |
2715 | ||
83d5cde4 | 2716 | static const struct block_device_operations pktcdvd_ops = { |
1da177e4 | 2717 | .owner = THIS_MODULE, |
5e5e007c AV |
2718 | .open = pkt_open, |
2719 | .release = pkt_close, | |
8a6cfeb6 | 2720 | .ioctl = pkt_ioctl, |
3c0d2060 | 2721 | .check_events = pkt_check_events, |
1da177e4 LT |
2722 | }; |
2723 | ||
2c9ede55 | 2724 | static char *pktcdvd_devnode(struct gendisk *gd, umode_t *mode) |
b03f38b6 KS |
2725 | { |
2726 | return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); | |
2727 | } | |
2728 | ||
1da177e4 LT |
2729 | /* |
2730 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2731 | */ | |
adb9250a | 2732 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
1da177e4 LT |
2733 | { |
2734 | int idx; | |
2735 | int ret = -ENOMEM; | |
2736 | struct pktcdvd_device *pd; | |
2737 | struct gendisk *disk; | |
adb9250a TM |
2738 | |
2739 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2740 | |
2741 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2742 | if (!pkt_devs[idx]) | |
2743 | break; | |
2744 | if (idx == MAX_WRITERS) { | |
99481334 | 2745 | pr_err("max %d writers supported\n", MAX_WRITERS); |
adb9250a TM |
2746 | ret = -EBUSY; |
2747 | goto out_mutex; | |
1da177e4 LT |
2748 | } |
2749 | ||
1107d2e0 | 2750 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
1da177e4 | 2751 | if (!pd) |
adb9250a | 2752 | goto out_mutex; |
1da177e4 | 2753 | |
0eaae62a MD |
2754 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
2755 | sizeof(struct pkt_rb_node)); | |
1da177e4 LT |
2756 | if (!pd->rb_pool) |
2757 | goto out_mem; | |
2758 | ||
e1bc89bc PO |
2759 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
2760 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2761 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2762 | ||
1da177e4 LT |
2763 | spin_lock_init(&pd->lock); |
2764 | spin_lock_init(&pd->iosched.lock); | |
c5ecc484 AM |
2765 | bio_list_init(&pd->iosched.read_queue); |
2766 | bio_list_init(&pd->iosched.write_queue); | |
7822082d | 2767 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
1da177e4 LT |
2768 | init_waitqueue_head(&pd->wqueue); |
2769 | pd->bio_queue = RB_ROOT; | |
2770 | ||
0a0fc960 TM |
2771 | pd->write_congestion_on = write_congestion_on; |
2772 | pd->write_congestion_off = write_congestion_off; | |
2773 | ||
adb9250a TM |
2774 | disk = alloc_disk(1); |
2775 | if (!disk) | |
2776 | goto out_mem; | |
2777 | pd->disk = disk; | |
add21660 | 2778 | disk->major = pktdev_major; |
1da177e4 LT |
2779 | disk->first_minor = idx; |
2780 | disk->fops = &pktcdvd_ops; | |
2781 | disk->flags = GENHD_FL_REMOVABLE; | |
adb9250a | 2782 | strcpy(disk->disk_name, pd->name); |
e454cea2 | 2783 | disk->devnode = pktcdvd_devnode; |
1da177e4 LT |
2784 | disk->private_data = pd; |
2785 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2786 | if (!disk->queue) | |
2787 | goto out_mem2; | |
2788 | ||
f331c029 | 2789 | pd->pkt_dev = MKDEV(pktdev_major, idx); |
1da177e4 LT |
2790 | ret = pkt_new_dev(pd, dev); |
2791 | if (ret) | |
2792 | goto out_new_dev; | |
2793 | ||
3c0d2060 TH |
2794 | /* inherit events of the host device */ |
2795 | disk->events = pd->bdev->bd_disk->events; | |
2796 | disk->async_events = pd->bdev->bd_disk->async_events; | |
2797 | ||
1da177e4 | 2798 | add_disk(disk); |
adb9250a | 2799 | |
32694850 TM |
2800 | pkt_sysfs_dev_new(pd); |
2801 | pkt_debugfs_dev_new(pd); | |
2802 | ||
1da177e4 | 2803 | pkt_devs[idx] = pd; |
adb9250a TM |
2804 | if (pkt_dev) |
2805 | *pkt_dev = pd->pkt_dev; | |
2806 | ||
2807 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2808 | return 0; |
2809 | ||
2810 | out_new_dev: | |
1312f40e | 2811 | blk_cleanup_queue(disk->queue); |
1da177e4 LT |
2812 | out_mem2: |
2813 | put_disk(disk); | |
2814 | out_mem: | |
2815 | if (pd->rb_pool) | |
2816 | mempool_destroy(pd->rb_pool); | |
2817 | kfree(pd); | |
adb9250a TM |
2818 | out_mutex: |
2819 | mutex_unlock(&ctl_mutex); | |
99481334 | 2820 | pr_err("setup of pktcdvd device failed\n"); |
1da177e4 LT |
2821 | return ret; |
2822 | } | |
2823 | ||
2824 | /* | |
2825 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2826 | */ | |
adb9250a | 2827 | static int pkt_remove_dev(dev_t pkt_dev) |
1da177e4 LT |
2828 | { |
2829 | struct pktcdvd_device *pd; | |
2830 | int idx; | |
adb9250a TM |
2831 | int ret = 0; |
2832 | ||
2833 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
1da177e4 LT |
2834 | |
2835 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2836 | pd = pkt_devs[idx]; | |
2837 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2838 | break; | |
2839 | } | |
2840 | if (idx == MAX_WRITERS) { | |
844aa797 | 2841 | pkt_dbg(1, pd, "dev not setup\n"); |
adb9250a TM |
2842 | ret = -ENXIO; |
2843 | goto out; | |
1da177e4 LT |
2844 | } |
2845 | ||
adb9250a TM |
2846 | if (pd->refcnt > 0) { |
2847 | ret = -EBUSY; | |
2848 | goto out; | |
2849 | } | |
1da177e4 LT |
2850 | if (!IS_ERR(pd->cdrw.thread)) |
2851 | kthread_stop(pd->cdrw.thread); | |
2852 | ||
32694850 TM |
2853 | pkt_devs[idx] = NULL; |
2854 | ||
2855 | pkt_debugfs_dev_remove(pd); | |
2856 | pkt_sysfs_dev_remove(pd); | |
2857 | ||
2cbed890 | 2858 | blkdev_put(pd->bdev, FMODE_READ | FMODE_NDELAY); |
1da177e4 | 2859 | |
1da177e4 | 2860 | remove_proc_entry(pd->name, pkt_proc); |
844aa797 | 2861 | pkt_dbg(1, pd, "writer unmapped\n"); |
1da177e4 LT |
2862 | |
2863 | del_gendisk(pd->disk); | |
1312f40e | 2864 | blk_cleanup_queue(pd->disk->queue); |
1da177e4 LT |
2865 | put_disk(pd->disk); |
2866 | ||
1da177e4 LT |
2867 | mempool_destroy(pd->rb_pool); |
2868 | kfree(pd); | |
2869 | ||
2870 | /* This is safe: open() is still holding a reference. */ | |
2871 | module_put(THIS_MODULE); | |
adb9250a TM |
2872 | |
2873 | out: | |
2874 | mutex_unlock(&ctl_mutex); | |
2875 | return ret; | |
1da177e4 LT |
2876 | } |
2877 | ||
2878 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
2879 | { | |
adb9250a TM |
2880 | struct pktcdvd_device *pd; |
2881 | ||
2882 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2883 | ||
2884 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
1da177e4 LT |
2885 | if (pd) { |
2886 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
2887 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
2888 | } else { | |
2889 | ctrl_cmd->dev = 0; | |
2890 | ctrl_cmd->pkt_dev = 0; | |
2891 | } | |
2892 | ctrl_cmd->num_devices = MAX_WRITERS; | |
adb9250a TM |
2893 | |
2894 | mutex_unlock(&ctl_mutex); | |
1da177e4 LT |
2895 | } |
2896 | ||
f80a0ca6 | 2897 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 LT |
2898 | { |
2899 | void __user *argp = (void __user *)arg; | |
2900 | struct pkt_ctrl_command ctrl_cmd; | |
2901 | int ret = 0; | |
adb9250a | 2902 | dev_t pkt_dev = 0; |
1da177e4 LT |
2903 | |
2904 | if (cmd != PACKET_CTRL_CMD) | |
2905 | return -ENOTTY; | |
2906 | ||
2907 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
2908 | return -EFAULT; | |
2909 | ||
2910 | switch (ctrl_cmd.command) { | |
2911 | case PKT_CTRL_CMD_SETUP: | |
2912 | if (!capable(CAP_SYS_ADMIN)) | |
2913 | return -EPERM; | |
adb9250a TM |
2914 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
2915 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
1da177e4 LT |
2916 | break; |
2917 | case PKT_CTRL_CMD_TEARDOWN: | |
2918 | if (!capable(CAP_SYS_ADMIN)) | |
2919 | return -EPERM; | |
adb9250a | 2920 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
1da177e4 LT |
2921 | break; |
2922 | case PKT_CTRL_CMD_STATUS: | |
1da177e4 | 2923 | pkt_get_status(&ctrl_cmd); |
1da177e4 LT |
2924 | break; |
2925 | default: | |
2926 | return -ENOTTY; | |
2927 | } | |
2928 | ||
2929 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
2930 | return -EFAULT; | |
2931 | return ret; | |
2932 | } | |
2933 | ||
f80a0ca6 AB |
2934 | #ifdef CONFIG_COMPAT |
2935 | static long pkt_ctl_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
2936 | { | |
2937 | return pkt_ctl_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
2938 | } | |
2939 | #endif | |
1da177e4 | 2940 | |
2b8693c0 | 2941 | static const struct file_operations pkt_ctl_fops = { |
f80a0ca6 AB |
2942 | .open = nonseekable_open, |
2943 | .unlocked_ioctl = pkt_ctl_ioctl, | |
2944 | #ifdef CONFIG_COMPAT | |
2945 | .compat_ioctl = pkt_ctl_compat_ioctl, | |
2946 | #endif | |
2947 | .owner = THIS_MODULE, | |
6038f373 | 2948 | .llseek = no_llseek, |
1da177e4 LT |
2949 | }; |
2950 | ||
2951 | static struct miscdevice pkt_misc = { | |
2952 | .minor = MISC_DYNAMIC_MINOR, | |
7822082d | 2953 | .name = DRIVER_NAME, |
e454cea2 | 2954 | .nodename = "pktcdvd/control", |
1da177e4 LT |
2955 | .fops = &pkt_ctl_fops |
2956 | }; | |
2957 | ||
2958 | static int __init pkt_init(void) | |
2959 | { | |
2960 | int ret; | |
2961 | ||
32694850 TM |
2962 | mutex_init(&ctl_mutex); |
2963 | ||
0eaae62a MD |
2964 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
2965 | sizeof(struct packet_stacked_data)); | |
1da177e4 LT |
2966 | if (!psd_pool) |
2967 | return -ENOMEM; | |
2968 | ||
add21660 | 2969 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 | 2970 | if (ret < 0) { |
99481334 | 2971 | pr_err("unable to register block device\n"); |
1da177e4 LT |
2972 | goto out2; |
2973 | } | |
add21660 TM |
2974 | if (!pktdev_major) |
2975 | pktdev_major = ret; | |
1da177e4 | 2976 | |
32694850 TM |
2977 | ret = pkt_sysfs_init(); |
2978 | if (ret) | |
2979 | goto out; | |
2980 | ||
2981 | pkt_debugfs_init(); | |
2982 | ||
1da177e4 LT |
2983 | ret = misc_register(&pkt_misc); |
2984 | if (ret) { | |
99481334 | 2985 | pr_err("unable to register misc device\n"); |
32694850 | 2986 | goto out_misc; |
1da177e4 LT |
2987 | } |
2988 | ||
928b4d8c | 2989 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
1da177e4 | 2990 | |
1da177e4 LT |
2991 | return 0; |
2992 | ||
32694850 TM |
2993 | out_misc: |
2994 | pkt_debugfs_cleanup(); | |
2995 | pkt_sysfs_cleanup(); | |
1da177e4 | 2996 | out: |
add21660 | 2997 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
2998 | out2: |
2999 | mempool_destroy(psd_pool); | |
3000 | return ret; | |
3001 | } | |
3002 | ||
3003 | static void __exit pkt_exit(void) | |
3004 | { | |
928b4d8c | 3005 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
1da177e4 | 3006 | misc_deregister(&pkt_misc); |
32694850 TM |
3007 | |
3008 | pkt_debugfs_cleanup(); | |
3009 | pkt_sysfs_cleanup(); | |
3010 | ||
add21660 | 3011 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
1da177e4 LT |
3012 | mempool_destroy(psd_pool); |
3013 | } | |
3014 | ||
3015 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
3016 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
3017 | MODULE_LICENSE("GPL"); | |
3018 | ||
3019 | module_init(pkt_init); | |
3020 | module_exit(pkt_exit); |