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1 | /* | |
2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> | |
3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> | |
4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> | |
5 | * | |
6 | * May be copied or modified under the terms of the GNU General Public | |
7 | * License. See linux/COPYING for more information. | |
8 | * | |
9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and | |
10 | * DVD-RAM devices. | |
11 | * | |
12 | * Theory of operation: | |
13 | * | |
14 | * At the lowest level, there is the standard driver for the CD/DVD device, | |
15 | * 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. | |
44 | * | |
45 | *************************************************************************/ | |
46 | ||
47 | #include <linux/pktcdvd.h> | |
48 | #include <linux/module.h> | |
49 | #include <linux/types.h> | |
50 | #include <linux/kernel.h> | |
51 | #include <linux/kthread.h> | |
52 | #include <linux/errno.h> | |
53 | #include <linux/spinlock.h> | |
54 | #include <linux/file.h> | |
55 | #include <linux/proc_fs.h> | |
56 | #include <linux/seq_file.h> | |
57 | #include <linux/miscdevice.h> | |
58 | #include <linux/freezer.h> | |
59 | #include <linux/mutex.h> | |
60 | #include <scsi/scsi_cmnd.h> | |
61 | #include <scsi/scsi_ioctl.h> | |
62 | #include <scsi/scsi.h> | |
63 | #include <linux/debugfs.h> | |
64 | #include <linux/device.h> | |
65 | ||
66 | #include <asm/uaccess.h> | |
67 | ||
68 | #define DRIVER_NAME "pktcdvd" | |
69 | ||
70 | #if PACKET_DEBUG | |
71 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
72 | #else | |
73 | #define DPRINTK(fmt, args...) | |
74 | #endif | |
75 | ||
76 | #if PACKET_DEBUG > 1 | |
77 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) | |
78 | #else | |
79 | #define VPRINTK(fmt, args...) | |
80 | #endif | |
81 | ||
82 | #define MAX_SPEED 0xffff | |
83 | ||
84 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) | |
85 | ||
86 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; | |
87 | static struct proc_dir_entry *pkt_proc; | |
88 | static int pktdev_major; | |
89 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; | |
90 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; | |
91 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ | |
92 | static mempool_t *psd_pool; | |
93 | ||
94 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ | |
95 | static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */ | |
96 | ||
97 | /* forward declaration */ | |
98 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); | |
99 | static int pkt_remove_dev(dev_t pkt_dev); | |
100 | static int pkt_seq_show(struct seq_file *m, void *p); | |
101 | ||
102 | ||
103 | ||
104 | /* | |
105 | * create and register a pktcdvd kernel object. | |
106 | */ | |
107 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, | |
108 | const char* name, | |
109 | struct kobject* parent, | |
110 | struct kobj_type* ktype) | |
111 | { | |
112 | struct pktcdvd_kobj *p; | |
113 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
114 | if (!p) | |
115 | return NULL; | |
116 | kobject_set_name(&p->kobj, "%s", name); | |
117 | p->kobj.parent = parent; | |
118 | p->kobj.ktype = ktype; | |
119 | p->pd = pd; | |
120 | if (kobject_register(&p->kobj) != 0) | |
121 | return NULL; | |
122 | return p; | |
123 | } | |
124 | /* | |
125 | * remove a pktcdvd kernel object. | |
126 | */ | |
127 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) | |
128 | { | |
129 | if (p) | |
130 | kobject_unregister(&p->kobj); | |
131 | } | |
132 | /* | |
133 | * default release function for pktcdvd kernel objects. | |
134 | */ | |
135 | static void pkt_kobj_release(struct kobject *kobj) | |
136 | { | |
137 | kfree(to_pktcdvdkobj(kobj)); | |
138 | } | |
139 | ||
140 | ||
141 | /********************************************************** | |
142 | * | |
143 | * sysfs interface for pktcdvd | |
144 | * by (C) 2006 Thomas Maier <balagi@justmail.de> | |
145 | * | |
146 | **********************************************************/ | |
147 | ||
148 | #define DEF_ATTR(_obj,_name,_mode) \ | |
149 | static struct attribute _obj = { \ | |
150 | .name = _name, .owner = THIS_MODULE, .mode = _mode } | |
151 | ||
152 | /********************************************************** | |
153 | /sys/class/pktcdvd/pktcdvd[0-7]/ | |
154 | stat/reset | |
155 | stat/packets_started | |
156 | stat/packets_finished | |
157 | stat/kb_written | |
158 | stat/kb_read | |
159 | stat/kb_read_gather | |
160 | write_queue/size | |
161 | write_queue/congestion_off | |
162 | write_queue/congestion_on | |
163 | **********************************************************/ | |
164 | ||
165 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); | |
166 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); | |
167 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); | |
168 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); | |
169 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); | |
170 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); | |
171 | ||
172 | static struct attribute *kobj_pkt_attrs_stat[] = { | |
173 | &kobj_pkt_attr_st1, | |
174 | &kobj_pkt_attr_st2, | |
175 | &kobj_pkt_attr_st3, | |
176 | &kobj_pkt_attr_st4, | |
177 | &kobj_pkt_attr_st5, | |
178 | &kobj_pkt_attr_st6, | |
179 | NULL | |
180 | }; | |
181 | ||
182 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); | |
183 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); | |
184 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); | |
185 | ||
186 | static struct attribute *kobj_pkt_attrs_wqueue[] = { | |
187 | &kobj_pkt_attr_wq1, | |
188 | &kobj_pkt_attr_wq2, | |
189 | &kobj_pkt_attr_wq3, | |
190 | NULL | |
191 | }; | |
192 | ||
193 | /* declares a char buffer[64] _dbuf, copies data from | |
194 | * _b with length _l into it and ensures that _dbuf ends | |
195 | * with a \0 character. | |
196 | */ | |
197 | #define DECLARE_BUF_AS_STRING(_dbuf, _b, _l) \ | |
198 | char _dbuf[64]; int dlen = (_l) < 0 ? 0 : (_l); \ | |
199 | if (dlen >= sizeof(_dbuf)) dlen = sizeof(_dbuf)-1; \ | |
200 | memcpy(_dbuf, _b, dlen); _dbuf[dlen] = 0 | |
201 | ||
202 | static ssize_t kobj_pkt_show(struct kobject *kobj, | |
203 | struct attribute *attr, char *data) | |
204 | { | |
205 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
206 | int n = 0; | |
207 | int v; | |
208 | if (strcmp(attr->name, "packets_started") == 0) { | |
209 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); | |
210 | ||
211 | } else if (strcmp(attr->name, "packets_finished") == 0) { | |
212 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); | |
213 | ||
214 | } else if (strcmp(attr->name, "kb_written") == 0) { | |
215 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); | |
216 | ||
217 | } else if (strcmp(attr->name, "kb_read") == 0) { | |
218 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); | |
219 | ||
220 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { | |
221 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); | |
222 | ||
223 | } else if (strcmp(attr->name, "size") == 0) { | |
224 | spin_lock(&pd->lock); | |
225 | v = pd->bio_queue_size; | |
226 | spin_unlock(&pd->lock); | |
227 | n = sprintf(data, "%d\n", v); | |
228 | ||
229 | } else if (strcmp(attr->name, "congestion_off") == 0) { | |
230 | spin_lock(&pd->lock); | |
231 | v = pd->write_congestion_off; | |
232 | spin_unlock(&pd->lock); | |
233 | n = sprintf(data, "%d\n", v); | |
234 | ||
235 | } else if (strcmp(attr->name, "congestion_on") == 0) { | |
236 | spin_lock(&pd->lock); | |
237 | v = pd->write_congestion_on; | |
238 | spin_unlock(&pd->lock); | |
239 | n = sprintf(data, "%d\n", v); | |
240 | } | |
241 | return n; | |
242 | } | |
243 | ||
244 | static void init_write_congestion_marks(int* lo, int* hi) | |
245 | { | |
246 | if (*hi > 0) { | |
247 | *hi = max(*hi, 500); | |
248 | *hi = min(*hi, 1000000); | |
249 | if (*lo <= 0) | |
250 | *lo = *hi - 100; | |
251 | else { | |
252 | *lo = min(*lo, *hi - 100); | |
253 | *lo = max(*lo, 100); | |
254 | } | |
255 | } else { | |
256 | *hi = -1; | |
257 | *lo = -1; | |
258 | } | |
259 | } | |
260 | ||
261 | static ssize_t kobj_pkt_store(struct kobject *kobj, | |
262 | struct attribute *attr, | |
263 | const char *data, size_t len) | |
264 | { | |
265 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; | |
266 | int val; | |
267 | DECLARE_BUF_AS_STRING(dbuf, data, len); /* ensure sscanf scans a string */ | |
268 | ||
269 | if (strcmp(attr->name, "reset") == 0 && dlen > 0) { | |
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 | |
277 | && sscanf(dbuf, "%d", &val) == 1) { | |
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 | |
285 | && sscanf(dbuf, "%d", &val) == 1) { | |
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 | ||
295 | static struct sysfs_ops kobj_pkt_ops = { | |
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) { | |
313 | pd->clsdev = class_device_create(class_pktcdvd, | |
314 | NULL, pd->pkt_dev, | |
315 | NULL, "%s", pd->name); | |
316 | if (IS_ERR(pd->clsdev)) | |
317 | pd->clsdev = NULL; | |
318 | } | |
319 | if (pd->clsdev) { | |
320 | pd->kobj_stat = pkt_kobj_create(pd, "stat", | |
321 | &pd->clsdev->kobj, | |
322 | &kobj_pkt_type_stat); | |
323 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", | |
324 | &pd->clsdev->kobj, | |
325 | &kobj_pkt_type_wqueue); | |
326 | } | |
327 | } | |
328 | ||
329 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) | |
330 | { | |
331 | pkt_kobj_remove(pd->kobj_stat); | |
332 | pkt_kobj_remove(pd->kobj_wqueue); | |
333 | if (class_pktcdvd) | |
334 | class_device_destroy(class_pktcdvd, pd->pkt_dev); | |
335 | } | |
336 | ||
337 | ||
338 | /******************************************************************** | |
339 | /sys/class/pktcdvd/ | |
340 | add map block device | |
341 | remove unmap packet dev | |
342 | device_map show mappings | |
343 | *******************************************************************/ | |
344 | ||
345 | static void class_pktcdvd_release(struct class *cls) | |
346 | { | |
347 | kfree(cls); | |
348 | } | |
349 | static ssize_t class_pktcdvd_show_map(struct class *c, char *data) | |
350 | { | |
351 | int n = 0; | |
352 | int idx; | |
353 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
354 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
355 | struct pktcdvd_device *pd = pkt_devs[idx]; | |
356 | if (!pd) | |
357 | continue; | |
358 | n += sprintf(data+n, "%s %u:%u %u:%u\n", | |
359 | pd->name, | |
360 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), | |
361 | MAJOR(pd->bdev->bd_dev), | |
362 | MINOR(pd->bdev->bd_dev)); | |
363 | } | |
364 | mutex_unlock(&ctl_mutex); | |
365 | return n; | |
366 | } | |
367 | ||
368 | static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf, | |
369 | size_t count) | |
370 | { | |
371 | unsigned int major, minor; | |
372 | DECLARE_BUF_AS_STRING(dbuf, buf, count); | |
373 | if (sscanf(dbuf, "%u:%u", &major, &minor) == 2) { | |
374 | pkt_setup_dev(MKDEV(major, minor), NULL); | |
375 | return count; | |
376 | } | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf, | |
381 | size_t count) | |
382 | { | |
383 | unsigned int major, minor; | |
384 | DECLARE_BUF_AS_STRING(dbuf, buf, count); | |
385 | if (sscanf(dbuf, "%u:%u", &major, &minor) == 2) { | |
386 | pkt_remove_dev(MKDEV(major, minor)); | |
387 | return count; | |
388 | } | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
392 | static struct class_attribute class_pktcdvd_attrs[] = { | |
393 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), | |
394 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), | |
395 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), | |
396 | __ATTR_NULL | |
397 | }; | |
398 | ||
399 | ||
400 | static int pkt_sysfs_init(void) | |
401 | { | |
402 | int ret = 0; | |
403 | ||
404 | /* | |
405 | * create control files in sysfs | |
406 | * /sys/class/pktcdvd/... | |
407 | */ | |
408 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); | |
409 | if (!class_pktcdvd) | |
410 | return -ENOMEM; | |
411 | class_pktcdvd->name = DRIVER_NAME; | |
412 | class_pktcdvd->owner = THIS_MODULE; | |
413 | class_pktcdvd->class_release = class_pktcdvd_release; | |
414 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; | |
415 | ret = class_register(class_pktcdvd); | |
416 | if (ret) { | |
417 | kfree(class_pktcdvd); | |
418 | class_pktcdvd = NULL; | |
419 | printk(DRIVER_NAME": failed to create class pktcdvd\n"); | |
420 | return ret; | |
421 | } | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static void pkt_sysfs_cleanup(void) | |
426 | { | |
427 | if (class_pktcdvd) | |
428 | class_destroy(class_pktcdvd); | |
429 | class_pktcdvd = NULL; | |
430 | } | |
431 | ||
432 | /******************************************************************** | |
433 | entries in debugfs | |
434 | ||
435 | /debugfs/pktcdvd[0-7]/ | |
436 | info | |
437 | ||
438 | *******************************************************************/ | |
439 | ||
440 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) | |
441 | { | |
442 | return pkt_seq_show(m, p); | |
443 | } | |
444 | ||
445 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) | |
446 | { | |
447 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); | |
448 | } | |
449 | ||
450 | static struct file_operations debug_fops = { | |
451 | .open = pkt_debugfs_fops_open, | |
452 | .read = seq_read, | |
453 | .llseek = seq_lseek, | |
454 | .release = single_release, | |
455 | .owner = THIS_MODULE, | |
456 | }; | |
457 | ||
458 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) | |
459 | { | |
460 | if (!pkt_debugfs_root) | |
461 | return; | |
462 | pd->dfs_f_info = NULL; | |
463 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); | |
464 | if (IS_ERR(pd->dfs_d_root)) { | |
465 | pd->dfs_d_root = NULL; | |
466 | return; | |
467 | } | |
468 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, | |
469 | pd->dfs_d_root, pd, &debug_fops); | |
470 | if (IS_ERR(pd->dfs_f_info)) { | |
471 | pd->dfs_f_info = NULL; | |
472 | return; | |
473 | } | |
474 | } | |
475 | ||
476 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) | |
477 | { | |
478 | if (!pkt_debugfs_root) | |
479 | return; | |
480 | if (pd->dfs_f_info) | |
481 | debugfs_remove(pd->dfs_f_info); | |
482 | pd->dfs_f_info = NULL; | |
483 | if (pd->dfs_d_root) | |
484 | debugfs_remove(pd->dfs_d_root); | |
485 | pd->dfs_d_root = NULL; | |
486 | } | |
487 | ||
488 | static void pkt_debugfs_init(void) | |
489 | { | |
490 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); | |
491 | if (IS_ERR(pkt_debugfs_root)) { | |
492 | pkt_debugfs_root = NULL; | |
493 | return; | |
494 | } | |
495 | } | |
496 | ||
497 | static void pkt_debugfs_cleanup(void) | |
498 | { | |
499 | if (!pkt_debugfs_root) | |
500 | return; | |
501 | debugfs_remove(pkt_debugfs_root); | |
502 | pkt_debugfs_root = NULL; | |
503 | } | |
504 | ||
505 | /* ----------------------------------------------------------*/ | |
506 | ||
507 | ||
508 | static void pkt_bio_finished(struct pktcdvd_device *pd) | |
509 | { | |
510 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); | |
511 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { | |
512 | VPRINTK(DRIVER_NAME": queue empty\n"); | |
513 | atomic_set(&pd->iosched.attention, 1); | |
514 | wake_up(&pd->wqueue); | |
515 | } | |
516 | } | |
517 | ||
518 | static void pkt_bio_destructor(struct bio *bio) | |
519 | { | |
520 | kfree(bio->bi_io_vec); | |
521 | kfree(bio); | |
522 | } | |
523 | ||
524 | static struct bio *pkt_bio_alloc(int nr_iovecs) | |
525 | { | |
526 | struct bio_vec *bvl = NULL; | |
527 | struct bio *bio; | |
528 | ||
529 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); | |
530 | if (!bio) | |
531 | goto no_bio; | |
532 | bio_init(bio); | |
533 | ||
534 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); | |
535 | if (!bvl) | |
536 | goto no_bvl; | |
537 | ||
538 | bio->bi_max_vecs = nr_iovecs; | |
539 | bio->bi_io_vec = bvl; | |
540 | bio->bi_destructor = pkt_bio_destructor; | |
541 | ||
542 | return bio; | |
543 | ||
544 | no_bvl: | |
545 | kfree(bio); | |
546 | no_bio: | |
547 | return NULL; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Allocate a packet_data struct | |
552 | */ | |
553 | static struct packet_data *pkt_alloc_packet_data(int frames) | |
554 | { | |
555 | int i; | |
556 | struct packet_data *pkt; | |
557 | ||
558 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); | |
559 | if (!pkt) | |
560 | goto no_pkt; | |
561 | ||
562 | pkt->frames = frames; | |
563 | pkt->w_bio = pkt_bio_alloc(frames); | |
564 | if (!pkt->w_bio) | |
565 | goto no_bio; | |
566 | ||
567 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { | |
568 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); | |
569 | if (!pkt->pages[i]) | |
570 | goto no_page; | |
571 | } | |
572 | ||
573 | spin_lock_init(&pkt->lock); | |
574 | ||
575 | for (i = 0; i < frames; i++) { | |
576 | struct bio *bio = pkt_bio_alloc(1); | |
577 | if (!bio) | |
578 | goto no_rd_bio; | |
579 | pkt->r_bios[i] = bio; | |
580 | } | |
581 | ||
582 | return pkt; | |
583 | ||
584 | no_rd_bio: | |
585 | for (i = 0; i < frames; i++) { | |
586 | struct bio *bio = pkt->r_bios[i]; | |
587 | if (bio) | |
588 | bio_put(bio); | |
589 | } | |
590 | ||
591 | no_page: | |
592 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) | |
593 | if (pkt->pages[i]) | |
594 | __free_page(pkt->pages[i]); | |
595 | bio_put(pkt->w_bio); | |
596 | no_bio: | |
597 | kfree(pkt); | |
598 | no_pkt: | |
599 | return NULL; | |
600 | } | |
601 | ||
602 | /* | |
603 | * Free a packet_data struct | |
604 | */ | |
605 | static void pkt_free_packet_data(struct packet_data *pkt) | |
606 | { | |
607 | int i; | |
608 | ||
609 | for (i = 0; i < pkt->frames; i++) { | |
610 | struct bio *bio = pkt->r_bios[i]; | |
611 | if (bio) | |
612 | bio_put(bio); | |
613 | } | |
614 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) | |
615 | __free_page(pkt->pages[i]); | |
616 | bio_put(pkt->w_bio); | |
617 | kfree(pkt); | |
618 | } | |
619 | ||
620 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) | |
621 | { | |
622 | struct packet_data *pkt, *next; | |
623 | ||
624 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); | |
625 | ||
626 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { | |
627 | pkt_free_packet_data(pkt); | |
628 | } | |
629 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); | |
630 | } | |
631 | ||
632 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) | |
633 | { | |
634 | struct packet_data *pkt; | |
635 | ||
636 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); | |
637 | ||
638 | while (nr_packets > 0) { | |
639 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); | |
640 | if (!pkt) { | |
641 | pkt_shrink_pktlist(pd); | |
642 | return 0; | |
643 | } | |
644 | pkt->id = nr_packets; | |
645 | pkt->pd = pd; | |
646 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
647 | nr_packets--; | |
648 | } | |
649 | return 1; | |
650 | } | |
651 | ||
652 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) | |
653 | { | |
654 | struct rb_node *n = rb_next(&node->rb_node); | |
655 | if (!n) | |
656 | return NULL; | |
657 | return rb_entry(n, struct pkt_rb_node, rb_node); | |
658 | } | |
659 | ||
660 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
661 | { | |
662 | rb_erase(&node->rb_node, &pd->bio_queue); | |
663 | mempool_free(node, pd->rb_pool); | |
664 | pd->bio_queue_size--; | |
665 | BUG_ON(pd->bio_queue_size < 0); | |
666 | } | |
667 | ||
668 | /* | |
669 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. | |
670 | */ | |
671 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) | |
672 | { | |
673 | struct rb_node *n = pd->bio_queue.rb_node; | |
674 | struct rb_node *next; | |
675 | struct pkt_rb_node *tmp; | |
676 | ||
677 | if (!n) { | |
678 | BUG_ON(pd->bio_queue_size > 0); | |
679 | return NULL; | |
680 | } | |
681 | ||
682 | for (;;) { | |
683 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); | |
684 | if (s <= tmp->bio->bi_sector) | |
685 | next = n->rb_left; | |
686 | else | |
687 | next = n->rb_right; | |
688 | if (!next) | |
689 | break; | |
690 | n = next; | |
691 | } | |
692 | ||
693 | if (s > tmp->bio->bi_sector) { | |
694 | tmp = pkt_rbtree_next(tmp); | |
695 | if (!tmp) | |
696 | return NULL; | |
697 | } | |
698 | BUG_ON(s > tmp->bio->bi_sector); | |
699 | return tmp; | |
700 | } | |
701 | ||
702 | /* | |
703 | * Insert a node into the pd->bio_queue rb tree. | |
704 | */ | |
705 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) | |
706 | { | |
707 | struct rb_node **p = &pd->bio_queue.rb_node; | |
708 | struct rb_node *parent = NULL; | |
709 | sector_t s = node->bio->bi_sector; | |
710 | struct pkt_rb_node *tmp; | |
711 | ||
712 | while (*p) { | |
713 | parent = *p; | |
714 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); | |
715 | if (s < tmp->bio->bi_sector) | |
716 | p = &(*p)->rb_left; | |
717 | else | |
718 | p = &(*p)->rb_right; | |
719 | } | |
720 | rb_link_node(&node->rb_node, parent, p); | |
721 | rb_insert_color(&node->rb_node, &pd->bio_queue); | |
722 | pd->bio_queue_size++; | |
723 | } | |
724 | ||
725 | /* | |
726 | * Add a bio to a single linked list defined by its head and tail pointers. | |
727 | */ | |
728 | static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) | |
729 | { | |
730 | bio->bi_next = NULL; | |
731 | if (*list_tail) { | |
732 | BUG_ON((*list_head) == NULL); | |
733 | (*list_tail)->bi_next = bio; | |
734 | (*list_tail) = bio; | |
735 | } else { | |
736 | BUG_ON((*list_head) != NULL); | |
737 | (*list_head) = bio; | |
738 | (*list_tail) = bio; | |
739 | } | |
740 | } | |
741 | ||
742 | /* | |
743 | * Remove and return the first bio from a single linked list defined by its | |
744 | * head and tail pointers. | |
745 | */ | |
746 | static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail) | |
747 | { | |
748 | struct bio *bio; | |
749 | ||
750 | if (*list_head == NULL) | |
751 | return NULL; | |
752 | ||
753 | bio = *list_head; | |
754 | *list_head = bio->bi_next; | |
755 | if (*list_head == NULL) | |
756 | *list_tail = NULL; | |
757 | ||
758 | bio->bi_next = NULL; | |
759 | return bio; | |
760 | } | |
761 | ||
762 | /* | |
763 | * Send a packet_command to the underlying block device and | |
764 | * wait for completion. | |
765 | */ | |
766 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) | |
767 | { | |
768 | char sense[SCSI_SENSE_BUFFERSIZE]; | |
769 | request_queue_t *q; | |
770 | struct request *rq; | |
771 | DECLARE_COMPLETION_ONSTACK(wait); | |
772 | int err = 0; | |
773 | ||
774 | q = bdev_get_queue(pd->bdev); | |
775 | ||
776 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? WRITE : READ, | |
777 | __GFP_WAIT); | |
778 | rq->errors = 0; | |
779 | rq->rq_disk = pd->bdev->bd_disk; | |
780 | rq->bio = NULL; | |
781 | rq->buffer = NULL; | |
782 | rq->timeout = 60*HZ; | |
783 | rq->data = cgc->buffer; | |
784 | rq->data_len = cgc->buflen; | |
785 | rq->sense = sense; | |
786 | memset(sense, 0, sizeof(sense)); | |
787 | rq->sense_len = 0; | |
788 | rq->cmd_type = REQ_TYPE_BLOCK_PC; | |
789 | rq->cmd_flags |= REQ_HARDBARRIER; | |
790 | if (cgc->quiet) | |
791 | rq->cmd_flags |= REQ_QUIET; | |
792 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); | |
793 | if (sizeof(rq->cmd) > CDROM_PACKET_SIZE) | |
794 | memset(rq->cmd + CDROM_PACKET_SIZE, 0, sizeof(rq->cmd) - CDROM_PACKET_SIZE); | |
795 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
796 | ||
797 | rq->ref_count++; | |
798 | rq->end_io_data = &wait; | |
799 | rq->end_io = blk_end_sync_rq; | |
800 | elv_add_request(q, rq, ELEVATOR_INSERT_BACK, 1); | |
801 | generic_unplug_device(q); | |
802 | wait_for_completion(&wait); | |
803 | ||
804 | if (rq->errors) | |
805 | err = -EIO; | |
806 | ||
807 | blk_put_request(rq); | |
808 | return err; | |
809 | } | |
810 | ||
811 | /* | |
812 | * A generic sense dump / resolve mechanism should be implemented across | |
813 | * all ATAPI + SCSI devices. | |
814 | */ | |
815 | static void pkt_dump_sense(struct packet_command *cgc) | |
816 | { | |
817 | static char *info[9] = { "No sense", "Recovered error", "Not ready", | |
818 | "Medium error", "Hardware error", "Illegal request", | |
819 | "Unit attention", "Data protect", "Blank check" }; | |
820 | int i; | |
821 | struct request_sense *sense = cgc->sense; | |
822 | ||
823 | printk(DRIVER_NAME":"); | |
824 | for (i = 0; i < CDROM_PACKET_SIZE; i++) | |
825 | printk(" %02x", cgc->cmd[i]); | |
826 | printk(" - "); | |
827 | ||
828 | if (sense == NULL) { | |
829 | printk("no sense\n"); | |
830 | return; | |
831 | } | |
832 | ||
833 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); | |
834 | ||
835 | if (sense->sense_key > 8) { | |
836 | printk(" (INVALID)\n"); | |
837 | return; | |
838 | } | |
839 | ||
840 | printk(" (%s)\n", info[sense->sense_key]); | |
841 | } | |
842 | ||
843 | /* | |
844 | * flush the drive cache to media | |
845 | */ | |
846 | static int pkt_flush_cache(struct pktcdvd_device *pd) | |
847 | { | |
848 | struct packet_command cgc; | |
849 | ||
850 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
851 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; | |
852 | cgc.quiet = 1; | |
853 | ||
854 | /* | |
855 | * the IMMED bit -- we default to not setting it, although that | |
856 | * would allow a much faster close, this is safer | |
857 | */ | |
858 | #if 0 | |
859 | cgc.cmd[1] = 1 << 1; | |
860 | #endif | |
861 | return pkt_generic_packet(pd, &cgc); | |
862 | } | |
863 | ||
864 | /* | |
865 | * speed is given as the normal factor, e.g. 4 for 4x | |
866 | */ | |
867 | static int pkt_set_speed(struct pktcdvd_device *pd, unsigned write_speed, unsigned read_speed) | |
868 | { | |
869 | struct packet_command cgc; | |
870 | struct request_sense sense; | |
871 | int ret; | |
872 | ||
873 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
874 | cgc.sense = &sense; | |
875 | cgc.cmd[0] = GPCMD_SET_SPEED; | |
876 | cgc.cmd[2] = (read_speed >> 8) & 0xff; | |
877 | cgc.cmd[3] = read_speed & 0xff; | |
878 | cgc.cmd[4] = (write_speed >> 8) & 0xff; | |
879 | cgc.cmd[5] = write_speed & 0xff; | |
880 | ||
881 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
882 | pkt_dump_sense(&cgc); | |
883 | ||
884 | return ret; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Queue a bio for processing by the low-level CD device. Must be called | |
889 | * from process context. | |
890 | */ | |
891 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) | |
892 | { | |
893 | spin_lock(&pd->iosched.lock); | |
894 | if (bio_data_dir(bio) == READ) { | |
895 | pkt_add_list_last(bio, &pd->iosched.read_queue, | |
896 | &pd->iosched.read_queue_tail); | |
897 | } else { | |
898 | pkt_add_list_last(bio, &pd->iosched.write_queue, | |
899 | &pd->iosched.write_queue_tail); | |
900 | } | |
901 | spin_unlock(&pd->iosched.lock); | |
902 | ||
903 | atomic_set(&pd->iosched.attention, 1); | |
904 | wake_up(&pd->wqueue); | |
905 | } | |
906 | ||
907 | /* | |
908 | * Process the queued read/write requests. This function handles special | |
909 | * requirements for CDRW drives: | |
910 | * - A cache flush command must be inserted before a read request if the | |
911 | * previous request was a write. | |
912 | * - Switching between reading and writing is slow, so don't do it more often | |
913 | * than necessary. | |
914 | * - Optimize for throughput at the expense of latency. This means that streaming | |
915 | * writes will never be interrupted by a read, but if the drive has to seek | |
916 | * before the next write, switch to reading instead if there are any pending | |
917 | * read requests. | |
918 | * - Set the read speed according to current usage pattern. When only reading | |
919 | * from the device, it's best to use the highest possible read speed, but | |
920 | * when switching often between reading and writing, it's better to have the | |
921 | * same read and write speeds. | |
922 | */ | |
923 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) | |
924 | { | |
925 | ||
926 | if (atomic_read(&pd->iosched.attention) == 0) | |
927 | return; | |
928 | atomic_set(&pd->iosched.attention, 0); | |
929 | ||
930 | for (;;) { | |
931 | struct bio *bio; | |
932 | int reads_queued, writes_queued; | |
933 | ||
934 | spin_lock(&pd->iosched.lock); | |
935 | reads_queued = (pd->iosched.read_queue != NULL); | |
936 | writes_queued = (pd->iosched.write_queue != NULL); | |
937 | spin_unlock(&pd->iosched.lock); | |
938 | ||
939 | if (!reads_queued && !writes_queued) | |
940 | break; | |
941 | ||
942 | if (pd->iosched.writing) { | |
943 | int need_write_seek = 1; | |
944 | spin_lock(&pd->iosched.lock); | |
945 | bio = pd->iosched.write_queue; | |
946 | spin_unlock(&pd->iosched.lock); | |
947 | if (bio && (bio->bi_sector == pd->iosched.last_write)) | |
948 | need_write_seek = 0; | |
949 | if (need_write_seek && reads_queued) { | |
950 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
951 | VPRINTK(DRIVER_NAME": write, waiting\n"); | |
952 | break; | |
953 | } | |
954 | pkt_flush_cache(pd); | |
955 | pd->iosched.writing = 0; | |
956 | } | |
957 | } else { | |
958 | if (!reads_queued && writes_queued) { | |
959 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { | |
960 | VPRINTK(DRIVER_NAME": read, waiting\n"); | |
961 | break; | |
962 | } | |
963 | pd->iosched.writing = 1; | |
964 | } | |
965 | } | |
966 | ||
967 | spin_lock(&pd->iosched.lock); | |
968 | if (pd->iosched.writing) { | |
969 | bio = pkt_get_list_first(&pd->iosched.write_queue, | |
970 | &pd->iosched.write_queue_tail); | |
971 | } else { | |
972 | bio = pkt_get_list_first(&pd->iosched.read_queue, | |
973 | &pd->iosched.read_queue_tail); | |
974 | } | |
975 | spin_unlock(&pd->iosched.lock); | |
976 | ||
977 | if (!bio) | |
978 | continue; | |
979 | ||
980 | if (bio_data_dir(bio) == READ) | |
981 | pd->iosched.successive_reads += bio->bi_size >> 10; | |
982 | else { | |
983 | pd->iosched.successive_reads = 0; | |
984 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); | |
985 | } | |
986 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { | |
987 | if (pd->read_speed == pd->write_speed) { | |
988 | pd->read_speed = MAX_SPEED; | |
989 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
990 | } | |
991 | } else { | |
992 | if (pd->read_speed != pd->write_speed) { | |
993 | pd->read_speed = pd->write_speed; | |
994 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); | |
995 | } | |
996 | } | |
997 | ||
998 | atomic_inc(&pd->cdrw.pending_bios); | |
999 | generic_make_request(bio); | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * Special care is needed if the underlying block device has a small | |
1005 | * max_phys_segments value. | |
1006 | */ | |
1007 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, request_queue_t *q) | |
1008 | { | |
1009 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) { | |
1010 | /* | |
1011 | * The cdrom device can handle one segment/frame | |
1012 | */ | |
1013 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); | |
1014 | return 0; | |
1015 | } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) { | |
1016 | /* | |
1017 | * We can handle this case at the expense of some extra memory | |
1018 | * copies during write operations | |
1019 | */ | |
1020 | set_bit(PACKET_MERGE_SEGS, &pd->flags); | |
1021 | return 0; | |
1022 | } else { | |
1023 | printk(DRIVER_NAME": cdrom max_phys_segments too small\n"); | |
1024 | return -EIO; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page | |
1030 | */ | |
1031 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) | |
1032 | { | |
1033 | unsigned int copy_size = CD_FRAMESIZE; | |
1034 | ||
1035 | while (copy_size > 0) { | |
1036 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); | |
1037 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + | |
1038 | src_bvl->bv_offset + offs; | |
1039 | void *vto = page_address(dst_page) + dst_offs; | |
1040 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); | |
1041 | ||
1042 | BUG_ON(len < 0); | |
1043 | memcpy(vto, vfrom, len); | |
1044 | kunmap_atomic(vfrom, KM_USER0); | |
1045 | ||
1046 | seg++; | |
1047 | offs = 0; | |
1048 | dst_offs += len; | |
1049 | copy_size -= len; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * Copy all data for this packet to pkt->pages[], so that | |
1055 | * a) The number of required segments for the write bio is minimized, which | |
1056 | * is necessary for some scsi controllers. | |
1057 | * b) The data can be used as cache to avoid read requests if we receive a | |
1058 | * new write request for the same zone. | |
1059 | */ | |
1060 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) | |
1061 | { | |
1062 | int f, p, offs; | |
1063 | ||
1064 | /* Copy all data to pkt->pages[] */ | |
1065 | p = 0; | |
1066 | offs = 0; | |
1067 | for (f = 0; f < pkt->frames; f++) { | |
1068 | if (bvec[f].bv_page != pkt->pages[p]) { | |
1069 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; | |
1070 | void *vto = page_address(pkt->pages[p]) + offs; | |
1071 | memcpy(vto, vfrom, CD_FRAMESIZE); | |
1072 | kunmap_atomic(vfrom, KM_USER0); | |
1073 | bvec[f].bv_page = pkt->pages[p]; | |
1074 | bvec[f].bv_offset = offs; | |
1075 | } else { | |
1076 | BUG_ON(bvec[f].bv_offset != offs); | |
1077 | } | |
1078 | offs += CD_FRAMESIZE; | |
1079 | if (offs >= PAGE_SIZE) { | |
1080 | offs = 0; | |
1081 | p++; | |
1082 | } | |
1083 | } | |
1084 | } | |
1085 | ||
1086 | static int pkt_end_io_read(struct bio *bio, unsigned int bytes_done, int err) | |
1087 | { | |
1088 | struct packet_data *pkt = bio->bi_private; | |
1089 | struct pktcdvd_device *pd = pkt->pd; | |
1090 | BUG_ON(!pd); | |
1091 | ||
1092 | if (bio->bi_size) | |
1093 | return 1; | |
1094 | ||
1095 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, | |
1096 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); | |
1097 | ||
1098 | if (err) | |
1099 | atomic_inc(&pkt->io_errors); | |
1100 | if (atomic_dec_and_test(&pkt->io_wait)) { | |
1101 | atomic_inc(&pkt->run_sm); | |
1102 | wake_up(&pd->wqueue); | |
1103 | } | |
1104 | pkt_bio_finished(pd); | |
1105 | ||
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | static int pkt_end_io_packet_write(struct bio *bio, unsigned int bytes_done, int err) | |
1110 | { | |
1111 | struct packet_data *pkt = bio->bi_private; | |
1112 | struct pktcdvd_device *pd = pkt->pd; | |
1113 | BUG_ON(!pd); | |
1114 | ||
1115 | if (bio->bi_size) | |
1116 | return 1; | |
1117 | ||
1118 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); | |
1119 | ||
1120 | pd->stats.pkt_ended++; | |
1121 | ||
1122 | pkt_bio_finished(pd); | |
1123 | atomic_dec(&pkt->io_wait); | |
1124 | atomic_inc(&pkt->run_sm); | |
1125 | wake_up(&pd->wqueue); | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Schedule reads for the holes in a packet | |
1131 | */ | |
1132 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1133 | { | |
1134 | int frames_read = 0; | |
1135 | struct bio *bio; | |
1136 | int f; | |
1137 | char written[PACKET_MAX_SIZE]; | |
1138 | ||
1139 | BUG_ON(!pkt->orig_bios); | |
1140 | ||
1141 | atomic_set(&pkt->io_wait, 0); | |
1142 | atomic_set(&pkt->io_errors, 0); | |
1143 | ||
1144 | /* | |
1145 | * Figure out which frames we need to read before we can write. | |
1146 | */ | |
1147 | memset(written, 0, sizeof(written)); | |
1148 | spin_lock(&pkt->lock); | |
1149 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1150 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1151 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
1152 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); | |
1153 | BUG_ON(first_frame < 0); | |
1154 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1155 | for (f = first_frame; f < first_frame + num_frames; f++) | |
1156 | written[f] = 1; | |
1157 | } | |
1158 | spin_unlock(&pkt->lock); | |
1159 | ||
1160 | if (pkt->cache_valid) { | |
1161 | VPRINTK("pkt_gather_data: zone %llx cached\n", | |
1162 | (unsigned long long)pkt->sector); | |
1163 | goto out_account; | |
1164 | } | |
1165 | ||
1166 | /* | |
1167 | * Schedule reads for missing parts of the packet. | |
1168 | */ | |
1169 | for (f = 0; f < pkt->frames; f++) { | |
1170 | int p, offset; | |
1171 | if (written[f]) | |
1172 | continue; | |
1173 | bio = pkt->r_bios[f]; | |
1174 | bio_init(bio); | |
1175 | bio->bi_max_vecs = 1; | |
1176 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); | |
1177 | bio->bi_bdev = pd->bdev; | |
1178 | bio->bi_end_io = pkt_end_io_read; | |
1179 | bio->bi_private = pkt; | |
1180 | ||
1181 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; | |
1182 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1183 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", | |
1184 | f, pkt->pages[p], offset); | |
1185 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) | |
1186 | BUG(); | |
1187 | ||
1188 | atomic_inc(&pkt->io_wait); | |
1189 | bio->bi_rw = READ; | |
1190 | pkt_queue_bio(pd, bio); | |
1191 | frames_read++; | |
1192 | } | |
1193 | ||
1194 | out_account: | |
1195 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", | |
1196 | frames_read, (unsigned long long)pkt->sector); | |
1197 | pd->stats.pkt_started++; | |
1198 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Find a packet matching zone, or the least recently used packet if | |
1203 | * there is no match. | |
1204 | */ | |
1205 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) | |
1206 | { | |
1207 | struct packet_data *pkt; | |
1208 | ||
1209 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { | |
1210 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { | |
1211 | list_del_init(&pkt->list); | |
1212 | if (pkt->sector != zone) | |
1213 | pkt->cache_valid = 0; | |
1214 | return pkt; | |
1215 | } | |
1216 | } | |
1217 | BUG(); | |
1218 | return NULL; | |
1219 | } | |
1220 | ||
1221 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1222 | { | |
1223 | if (pkt->cache_valid) { | |
1224 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); | |
1225 | } else { | |
1226 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * recover a failed write, query for relocation if possible | |
1232 | * | |
1233 | * returns 1 if recovery is possible, or 0 if not | |
1234 | * | |
1235 | */ | |
1236 | static int pkt_start_recovery(struct packet_data *pkt) | |
1237 | { | |
1238 | /* | |
1239 | * FIXME. We need help from the file system to implement | |
1240 | * recovery handling. | |
1241 | */ | |
1242 | return 0; | |
1243 | #if 0 | |
1244 | struct request *rq = pkt->rq; | |
1245 | struct pktcdvd_device *pd = rq->rq_disk->private_data; | |
1246 | struct block_device *pkt_bdev; | |
1247 | struct super_block *sb = NULL; | |
1248 | unsigned long old_block, new_block; | |
1249 | sector_t new_sector; | |
1250 | ||
1251 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); | |
1252 | if (pkt_bdev) { | |
1253 | sb = get_super(pkt_bdev); | |
1254 | bdput(pkt_bdev); | |
1255 | } | |
1256 | ||
1257 | if (!sb) | |
1258 | return 0; | |
1259 | ||
1260 | if (!sb->s_op || !sb->s_op->relocate_blocks) | |
1261 | goto out; | |
1262 | ||
1263 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); | |
1264 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) | |
1265 | goto out; | |
1266 | ||
1267 | new_sector = new_block * (CD_FRAMESIZE >> 9); | |
1268 | pkt->sector = new_sector; | |
1269 | ||
1270 | pkt->bio->bi_sector = new_sector; | |
1271 | pkt->bio->bi_next = NULL; | |
1272 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; | |
1273 | pkt->bio->bi_idx = 0; | |
1274 | ||
1275 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); | |
1276 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); | |
1277 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); | |
1278 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); | |
1279 | BUG_ON(pkt->bio->bi_private != pkt); | |
1280 | ||
1281 | drop_super(sb); | |
1282 | return 1; | |
1283 | ||
1284 | out: | |
1285 | drop_super(sb); | |
1286 | return 0; | |
1287 | #endif | |
1288 | } | |
1289 | ||
1290 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) | |
1291 | { | |
1292 | #if PACKET_DEBUG > 1 | |
1293 | static const char *state_name[] = { | |
1294 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" | |
1295 | }; | |
1296 | enum packet_data_state old_state = pkt->state; | |
1297 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, | |
1298 | state_name[old_state], state_name[state]); | |
1299 | #endif | |
1300 | pkt->state = state; | |
1301 | } | |
1302 | ||
1303 | /* | |
1304 | * Scan the work queue to see if we can start a new packet. | |
1305 | * returns non-zero if any work was done. | |
1306 | */ | |
1307 | static int pkt_handle_queue(struct pktcdvd_device *pd) | |
1308 | { | |
1309 | struct packet_data *pkt, *p; | |
1310 | struct bio *bio = NULL; | |
1311 | sector_t zone = 0; /* Suppress gcc warning */ | |
1312 | struct pkt_rb_node *node, *first_node; | |
1313 | struct rb_node *n; | |
1314 | int wakeup; | |
1315 | ||
1316 | VPRINTK("handle_queue\n"); | |
1317 | ||
1318 | atomic_set(&pd->scan_queue, 0); | |
1319 | ||
1320 | if (list_empty(&pd->cdrw.pkt_free_list)) { | |
1321 | VPRINTK("handle_queue: no pkt\n"); | |
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | /* | |
1326 | * Try to find a zone we are not already working on. | |
1327 | */ | |
1328 | spin_lock(&pd->lock); | |
1329 | first_node = pkt_rbtree_find(pd, pd->current_sector); | |
1330 | if (!first_node) { | |
1331 | n = rb_first(&pd->bio_queue); | |
1332 | if (n) | |
1333 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1334 | } | |
1335 | node = first_node; | |
1336 | while (node) { | |
1337 | bio = node->bio; | |
1338 | zone = ZONE(bio->bi_sector, pd); | |
1339 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { | |
1340 | if (p->sector == zone) { | |
1341 | bio = NULL; | |
1342 | goto try_next_bio; | |
1343 | } | |
1344 | } | |
1345 | break; | |
1346 | try_next_bio: | |
1347 | node = pkt_rbtree_next(node); | |
1348 | if (!node) { | |
1349 | n = rb_first(&pd->bio_queue); | |
1350 | if (n) | |
1351 | node = rb_entry(n, struct pkt_rb_node, rb_node); | |
1352 | } | |
1353 | if (node == first_node) | |
1354 | node = NULL; | |
1355 | } | |
1356 | spin_unlock(&pd->lock); | |
1357 | if (!bio) { | |
1358 | VPRINTK("handle_queue: no bio\n"); | |
1359 | return 0; | |
1360 | } | |
1361 | ||
1362 | pkt = pkt_get_packet_data(pd, zone); | |
1363 | ||
1364 | pd->current_sector = zone + pd->settings.size; | |
1365 | pkt->sector = zone; | |
1366 | BUG_ON(pkt->frames != pd->settings.size >> 2); | |
1367 | pkt->write_size = 0; | |
1368 | ||
1369 | /* | |
1370 | * Scan work queue for bios in the same zone and link them | |
1371 | * to this packet. | |
1372 | */ | |
1373 | spin_lock(&pd->lock); | |
1374 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); | |
1375 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { | |
1376 | bio = node->bio; | |
1377 | VPRINTK("pkt_handle_queue: found zone=%llx\n", | |
1378 | (unsigned long long)ZONE(bio->bi_sector, pd)); | |
1379 | if (ZONE(bio->bi_sector, pd) != zone) | |
1380 | break; | |
1381 | pkt_rbtree_erase(pd, node); | |
1382 | spin_lock(&pkt->lock); | |
1383 | pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); | |
1384 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
1385 | spin_unlock(&pkt->lock); | |
1386 | } | |
1387 | /* check write congestion marks, and if bio_queue_size is | |
1388 | below, wake up any waiters */ | |
1389 | wakeup = (pd->write_congestion_on > 0 | |
1390 | && pd->bio_queue_size <= pd->write_congestion_off); | |
1391 | spin_unlock(&pd->lock); | |
1392 | if (wakeup) | |
1393 | blk_clear_queue_congested(pd->disk->queue, WRITE); | |
1394 | ||
1395 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); | |
1396 | pkt_set_state(pkt, PACKET_WAITING_STATE); | |
1397 | atomic_set(&pkt->run_sm, 1); | |
1398 | ||
1399 | spin_lock(&pd->cdrw.active_list_lock); | |
1400 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); | |
1401 | spin_unlock(&pd->cdrw.active_list_lock); | |
1402 | ||
1403 | return 1; | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * Assemble a bio to write one packet and queue the bio for processing | |
1408 | * by the underlying block device. | |
1409 | */ | |
1410 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1411 | { | |
1412 | struct bio *bio; | |
1413 | int f; | |
1414 | int frames_write; | |
1415 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; | |
1416 | ||
1417 | for (f = 0; f < pkt->frames; f++) { | |
1418 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; | |
1419 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; | |
1420 | } | |
1421 | ||
1422 | /* | |
1423 | * Fill-in bvec with data from orig_bios. | |
1424 | */ | |
1425 | frames_write = 0; | |
1426 | spin_lock(&pkt->lock); | |
1427 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { | |
1428 | int segment = bio->bi_idx; | |
1429 | int src_offs = 0; | |
1430 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); | |
1431 | int num_frames = bio->bi_size / CD_FRAMESIZE; | |
1432 | BUG_ON(first_frame < 0); | |
1433 | BUG_ON(first_frame + num_frames > pkt->frames); | |
1434 | for (f = first_frame; f < first_frame + num_frames; f++) { | |
1435 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); | |
1436 | ||
1437 | while (src_offs >= src_bvl->bv_len) { | |
1438 | src_offs -= src_bvl->bv_len; | |
1439 | segment++; | |
1440 | BUG_ON(segment >= bio->bi_vcnt); | |
1441 | src_bvl = bio_iovec_idx(bio, segment); | |
1442 | } | |
1443 | ||
1444 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { | |
1445 | bvec[f].bv_page = src_bvl->bv_page; | |
1446 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; | |
1447 | } else { | |
1448 | pkt_copy_bio_data(bio, segment, src_offs, | |
1449 | bvec[f].bv_page, bvec[f].bv_offset); | |
1450 | } | |
1451 | src_offs += CD_FRAMESIZE; | |
1452 | frames_write++; | |
1453 | } | |
1454 | } | |
1455 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); | |
1456 | spin_unlock(&pkt->lock); | |
1457 | ||
1458 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", | |
1459 | frames_write, (unsigned long long)pkt->sector); | |
1460 | BUG_ON(frames_write != pkt->write_size); | |
1461 | ||
1462 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { | |
1463 | pkt_make_local_copy(pkt, bvec); | |
1464 | pkt->cache_valid = 1; | |
1465 | } else { | |
1466 | pkt->cache_valid = 0; | |
1467 | } | |
1468 | ||
1469 | /* Start the write request */ | |
1470 | bio_init(pkt->w_bio); | |
1471 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; | |
1472 | pkt->w_bio->bi_sector = pkt->sector; | |
1473 | pkt->w_bio->bi_bdev = pd->bdev; | |
1474 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; | |
1475 | pkt->w_bio->bi_private = pkt; | |
1476 | for (f = 0; f < pkt->frames; f++) | |
1477 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) | |
1478 | BUG(); | |
1479 | VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt); | |
1480 | ||
1481 | atomic_set(&pkt->io_wait, 1); | |
1482 | pkt->w_bio->bi_rw = WRITE; | |
1483 | pkt_queue_bio(pd, pkt->w_bio); | |
1484 | } | |
1485 | ||
1486 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) | |
1487 | { | |
1488 | struct bio *bio, *next; | |
1489 | ||
1490 | if (!uptodate) | |
1491 | pkt->cache_valid = 0; | |
1492 | ||
1493 | /* Finish all bios corresponding to this packet */ | |
1494 | bio = pkt->orig_bios; | |
1495 | while (bio) { | |
1496 | next = bio->bi_next; | |
1497 | bio->bi_next = NULL; | |
1498 | bio_endio(bio, bio->bi_size, uptodate ? 0 : -EIO); | |
1499 | bio = next; | |
1500 | } | |
1501 | pkt->orig_bios = pkt->orig_bios_tail = NULL; | |
1502 | } | |
1503 | ||
1504 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) | |
1505 | { | |
1506 | int uptodate; | |
1507 | ||
1508 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); | |
1509 | ||
1510 | for (;;) { | |
1511 | switch (pkt->state) { | |
1512 | case PACKET_WAITING_STATE: | |
1513 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) | |
1514 | return; | |
1515 | ||
1516 | pkt->sleep_time = 0; | |
1517 | pkt_gather_data(pd, pkt); | |
1518 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); | |
1519 | break; | |
1520 | ||
1521 | case PACKET_READ_WAIT_STATE: | |
1522 | if (atomic_read(&pkt->io_wait) > 0) | |
1523 | return; | |
1524 | ||
1525 | if (atomic_read(&pkt->io_errors) > 0) { | |
1526 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1527 | } else { | |
1528 | pkt_start_write(pd, pkt); | |
1529 | } | |
1530 | break; | |
1531 | ||
1532 | case PACKET_WRITE_WAIT_STATE: | |
1533 | if (atomic_read(&pkt->io_wait) > 0) | |
1534 | return; | |
1535 | ||
1536 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { | |
1537 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1538 | } else { | |
1539 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); | |
1540 | } | |
1541 | break; | |
1542 | ||
1543 | case PACKET_RECOVERY_STATE: | |
1544 | if (pkt_start_recovery(pkt)) { | |
1545 | pkt_start_write(pd, pkt); | |
1546 | } else { | |
1547 | VPRINTK("No recovery possible\n"); | |
1548 | pkt_set_state(pkt, PACKET_FINISHED_STATE); | |
1549 | } | |
1550 | break; | |
1551 | ||
1552 | case PACKET_FINISHED_STATE: | |
1553 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); | |
1554 | pkt_finish_packet(pkt, uptodate); | |
1555 | return; | |
1556 | ||
1557 | default: | |
1558 | BUG(); | |
1559 | break; | |
1560 | } | |
1561 | } | |
1562 | } | |
1563 | ||
1564 | static void pkt_handle_packets(struct pktcdvd_device *pd) | |
1565 | { | |
1566 | struct packet_data *pkt, *next; | |
1567 | ||
1568 | VPRINTK("pkt_handle_packets\n"); | |
1569 | ||
1570 | /* | |
1571 | * Run state machine for active packets | |
1572 | */ | |
1573 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1574 | if (atomic_read(&pkt->run_sm) > 0) { | |
1575 | atomic_set(&pkt->run_sm, 0); | |
1576 | pkt_run_state_machine(pd, pkt); | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * Move no longer active packets to the free list | |
1582 | */ | |
1583 | spin_lock(&pd->cdrw.active_list_lock); | |
1584 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { | |
1585 | if (pkt->state == PACKET_FINISHED_STATE) { | |
1586 | list_del(&pkt->list); | |
1587 | pkt_put_packet_data(pd, pkt); | |
1588 | pkt_set_state(pkt, PACKET_IDLE_STATE); | |
1589 | atomic_set(&pd->scan_queue, 1); | |
1590 | } | |
1591 | } | |
1592 | spin_unlock(&pd->cdrw.active_list_lock); | |
1593 | } | |
1594 | ||
1595 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) | |
1596 | { | |
1597 | struct packet_data *pkt; | |
1598 | int i; | |
1599 | ||
1600 | for (i = 0; i < PACKET_NUM_STATES; i++) | |
1601 | states[i] = 0; | |
1602 | ||
1603 | spin_lock(&pd->cdrw.active_list_lock); | |
1604 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1605 | states[pkt->state]++; | |
1606 | } | |
1607 | spin_unlock(&pd->cdrw.active_list_lock); | |
1608 | } | |
1609 | ||
1610 | /* | |
1611 | * kcdrwd is woken up when writes have been queued for one of our | |
1612 | * registered devices | |
1613 | */ | |
1614 | static int kcdrwd(void *foobar) | |
1615 | { | |
1616 | struct pktcdvd_device *pd = foobar; | |
1617 | struct packet_data *pkt; | |
1618 | long min_sleep_time, residue; | |
1619 | ||
1620 | set_user_nice(current, -20); | |
1621 | ||
1622 | for (;;) { | |
1623 | DECLARE_WAITQUEUE(wait, current); | |
1624 | ||
1625 | /* | |
1626 | * Wait until there is something to do | |
1627 | */ | |
1628 | add_wait_queue(&pd->wqueue, &wait); | |
1629 | for (;;) { | |
1630 | set_current_state(TASK_INTERRUPTIBLE); | |
1631 | ||
1632 | /* Check if we need to run pkt_handle_queue */ | |
1633 | if (atomic_read(&pd->scan_queue) > 0) | |
1634 | goto work_to_do; | |
1635 | ||
1636 | /* Check if we need to run the state machine for some packet */ | |
1637 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1638 | if (atomic_read(&pkt->run_sm) > 0) | |
1639 | goto work_to_do; | |
1640 | } | |
1641 | ||
1642 | /* Check if we need to process the iosched queues */ | |
1643 | if (atomic_read(&pd->iosched.attention) != 0) | |
1644 | goto work_to_do; | |
1645 | ||
1646 | /* Otherwise, go to sleep */ | |
1647 | if (PACKET_DEBUG > 1) { | |
1648 | int states[PACKET_NUM_STATES]; | |
1649 | pkt_count_states(pd, states); | |
1650 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
1651 | states[0], states[1], states[2], states[3], | |
1652 | states[4], states[5]); | |
1653 | } | |
1654 | ||
1655 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; | |
1656 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1657 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) | |
1658 | min_sleep_time = pkt->sleep_time; | |
1659 | } | |
1660 | ||
1661 | generic_unplug_device(bdev_get_queue(pd->bdev)); | |
1662 | ||
1663 | VPRINTK("kcdrwd: sleeping\n"); | |
1664 | residue = schedule_timeout(min_sleep_time); | |
1665 | VPRINTK("kcdrwd: wake up\n"); | |
1666 | ||
1667 | /* make swsusp happy with our thread */ | |
1668 | try_to_freeze(); | |
1669 | ||
1670 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
1671 | if (!pkt->sleep_time) | |
1672 | continue; | |
1673 | pkt->sleep_time -= min_sleep_time - residue; | |
1674 | if (pkt->sleep_time <= 0) { | |
1675 | pkt->sleep_time = 0; | |
1676 | atomic_inc(&pkt->run_sm); | |
1677 | } | |
1678 | } | |
1679 | ||
1680 | if (signal_pending(current)) { | |
1681 | flush_signals(current); | |
1682 | } | |
1683 | if (kthread_should_stop()) | |
1684 | break; | |
1685 | } | |
1686 | work_to_do: | |
1687 | set_current_state(TASK_RUNNING); | |
1688 | remove_wait_queue(&pd->wqueue, &wait); | |
1689 | ||
1690 | if (kthread_should_stop()) | |
1691 | break; | |
1692 | ||
1693 | /* | |
1694 | * if pkt_handle_queue returns true, we can queue | |
1695 | * another request. | |
1696 | */ | |
1697 | while (pkt_handle_queue(pd)) | |
1698 | ; | |
1699 | ||
1700 | /* | |
1701 | * Handle packet state machine | |
1702 | */ | |
1703 | pkt_handle_packets(pd); | |
1704 | ||
1705 | /* | |
1706 | * Handle iosched queues | |
1707 | */ | |
1708 | pkt_iosched_process_queue(pd); | |
1709 | } | |
1710 | ||
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | static void pkt_print_settings(struct pktcdvd_device *pd) | |
1715 | { | |
1716 | printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); | |
1717 | printk("%u blocks, ", pd->settings.size >> 2); | |
1718 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); | |
1719 | } | |
1720 | ||
1721 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) | |
1722 | { | |
1723 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1724 | ||
1725 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; | |
1726 | cgc->cmd[2] = page_code | (page_control << 6); | |
1727 | cgc->cmd[7] = cgc->buflen >> 8; | |
1728 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1729 | cgc->data_direction = CGC_DATA_READ; | |
1730 | return pkt_generic_packet(pd, cgc); | |
1731 | } | |
1732 | ||
1733 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) | |
1734 | { | |
1735 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); | |
1736 | memset(cgc->buffer, 0, 2); | |
1737 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; | |
1738 | cgc->cmd[1] = 0x10; /* PF */ | |
1739 | cgc->cmd[7] = cgc->buflen >> 8; | |
1740 | cgc->cmd[8] = cgc->buflen & 0xff; | |
1741 | cgc->data_direction = CGC_DATA_WRITE; | |
1742 | return pkt_generic_packet(pd, cgc); | |
1743 | } | |
1744 | ||
1745 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) | |
1746 | { | |
1747 | struct packet_command cgc; | |
1748 | int ret; | |
1749 | ||
1750 | /* set up command and get the disc info */ | |
1751 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); | |
1752 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; | |
1753 | cgc.cmd[8] = cgc.buflen = 2; | |
1754 | cgc.quiet = 1; | |
1755 | ||
1756 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1757 | return ret; | |
1758 | ||
1759 | /* not all drives have the same disc_info length, so requeue | |
1760 | * packet with the length the drive tells us it can supply | |
1761 | */ | |
1762 | cgc.buflen = be16_to_cpu(di->disc_information_length) + | |
1763 | sizeof(di->disc_information_length); | |
1764 | ||
1765 | if (cgc.buflen > sizeof(disc_information)) | |
1766 | cgc.buflen = sizeof(disc_information); | |
1767 | ||
1768 | cgc.cmd[8] = cgc.buflen; | |
1769 | return pkt_generic_packet(pd, &cgc); | |
1770 | } | |
1771 | ||
1772 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) | |
1773 | { | |
1774 | struct packet_command cgc; | |
1775 | int ret; | |
1776 | ||
1777 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); | |
1778 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; | |
1779 | cgc.cmd[1] = type & 3; | |
1780 | cgc.cmd[4] = (track & 0xff00) >> 8; | |
1781 | cgc.cmd[5] = track & 0xff; | |
1782 | cgc.cmd[8] = 8; | |
1783 | cgc.quiet = 1; | |
1784 | ||
1785 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
1786 | return ret; | |
1787 | ||
1788 | cgc.buflen = be16_to_cpu(ti->track_information_length) + | |
1789 | sizeof(ti->track_information_length); | |
1790 | ||
1791 | if (cgc.buflen > sizeof(track_information)) | |
1792 | cgc.buflen = sizeof(track_information); | |
1793 | ||
1794 | cgc.cmd[8] = cgc.buflen; | |
1795 | return pkt_generic_packet(pd, &cgc); | |
1796 | } | |
1797 | ||
1798 | static int pkt_get_last_written(struct pktcdvd_device *pd, long *last_written) | |
1799 | { | |
1800 | disc_information di; | |
1801 | track_information ti; | |
1802 | __u32 last_track; | |
1803 | int ret = -1; | |
1804 | ||
1805 | if ((ret = pkt_get_disc_info(pd, &di))) | |
1806 | return ret; | |
1807 | ||
1808 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; | |
1809 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1810 | return ret; | |
1811 | ||
1812 | /* if this track is blank, try the previous. */ | |
1813 | if (ti.blank) { | |
1814 | last_track--; | |
1815 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) | |
1816 | return ret; | |
1817 | } | |
1818 | ||
1819 | /* if last recorded field is valid, return it. */ | |
1820 | if (ti.lra_v) { | |
1821 | *last_written = be32_to_cpu(ti.last_rec_address); | |
1822 | } else { | |
1823 | /* make it up instead */ | |
1824 | *last_written = be32_to_cpu(ti.track_start) + | |
1825 | be32_to_cpu(ti.track_size); | |
1826 | if (ti.free_blocks) | |
1827 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); | |
1828 | } | |
1829 | return 0; | |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * write mode select package based on pd->settings | |
1834 | */ | |
1835 | static int pkt_set_write_settings(struct pktcdvd_device *pd) | |
1836 | { | |
1837 | struct packet_command cgc; | |
1838 | struct request_sense sense; | |
1839 | write_param_page *wp; | |
1840 | char buffer[128]; | |
1841 | int ret, size; | |
1842 | ||
1843 | /* doesn't apply to DVD+RW or DVD-RAM */ | |
1844 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) | |
1845 | return 0; | |
1846 | ||
1847 | memset(buffer, 0, sizeof(buffer)); | |
1848 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); | |
1849 | cgc.sense = &sense; | |
1850 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1851 | pkt_dump_sense(&cgc); | |
1852 | return ret; | |
1853 | } | |
1854 | ||
1855 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); | |
1856 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); | |
1857 | if (size > sizeof(buffer)) | |
1858 | size = sizeof(buffer); | |
1859 | ||
1860 | /* | |
1861 | * now get it all | |
1862 | */ | |
1863 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); | |
1864 | cgc.sense = &sense; | |
1865 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { | |
1866 | pkt_dump_sense(&cgc); | |
1867 | return ret; | |
1868 | } | |
1869 | ||
1870 | /* | |
1871 | * write page is offset header + block descriptor length | |
1872 | */ | |
1873 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; | |
1874 | ||
1875 | wp->fp = pd->settings.fp; | |
1876 | wp->track_mode = pd->settings.track_mode; | |
1877 | wp->write_type = pd->settings.write_type; | |
1878 | wp->data_block_type = pd->settings.block_mode; | |
1879 | ||
1880 | wp->multi_session = 0; | |
1881 | ||
1882 | #ifdef PACKET_USE_LS | |
1883 | wp->link_size = 7; | |
1884 | wp->ls_v = 1; | |
1885 | #endif | |
1886 | ||
1887 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { | |
1888 | wp->session_format = 0; | |
1889 | wp->subhdr2 = 0x20; | |
1890 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { | |
1891 | wp->session_format = 0x20; | |
1892 | wp->subhdr2 = 8; | |
1893 | #if 0 | |
1894 | wp->mcn[0] = 0x80; | |
1895 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); | |
1896 | #endif | |
1897 | } else { | |
1898 | /* | |
1899 | * paranoia | |
1900 | */ | |
1901 | printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type); | |
1902 | return 1; | |
1903 | } | |
1904 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); | |
1905 | ||
1906 | cgc.buflen = cgc.cmd[8] = size; | |
1907 | if ((ret = pkt_mode_select(pd, &cgc))) { | |
1908 | pkt_dump_sense(&cgc); | |
1909 | return ret; | |
1910 | } | |
1911 | ||
1912 | pkt_print_settings(pd); | |
1913 | return 0; | |
1914 | } | |
1915 | ||
1916 | /* | |
1917 | * 1 -- we can write to this track, 0 -- we can't | |
1918 | */ | |
1919 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) | |
1920 | { | |
1921 | switch (pd->mmc3_profile) { | |
1922 | case 0x1a: /* DVD+RW */ | |
1923 | case 0x12: /* DVD-RAM */ | |
1924 | /* The track is always writable on DVD+RW/DVD-RAM */ | |
1925 | return 1; | |
1926 | default: | |
1927 | break; | |
1928 | } | |
1929 | ||
1930 | if (!ti->packet || !ti->fp) | |
1931 | return 0; | |
1932 | ||
1933 | /* | |
1934 | * "good" settings as per Mt Fuji. | |
1935 | */ | |
1936 | if (ti->rt == 0 && ti->blank == 0) | |
1937 | return 1; | |
1938 | ||
1939 | if (ti->rt == 0 && ti->blank == 1) | |
1940 | return 1; | |
1941 | ||
1942 | if (ti->rt == 1 && ti->blank == 0) | |
1943 | return 1; | |
1944 | ||
1945 | printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); | |
1946 | return 0; | |
1947 | } | |
1948 | ||
1949 | /* | |
1950 | * 1 -- we can write to this disc, 0 -- we can't | |
1951 | */ | |
1952 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) | |
1953 | { | |
1954 | switch (pd->mmc3_profile) { | |
1955 | case 0x0a: /* CD-RW */ | |
1956 | case 0xffff: /* MMC3 not supported */ | |
1957 | break; | |
1958 | case 0x1a: /* DVD+RW */ | |
1959 | case 0x13: /* DVD-RW */ | |
1960 | case 0x12: /* DVD-RAM */ | |
1961 | return 1; | |
1962 | default: | |
1963 | VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile); | |
1964 | return 0; | |
1965 | } | |
1966 | ||
1967 | /* | |
1968 | * for disc type 0xff we should probably reserve a new track. | |
1969 | * but i'm not sure, should we leave this to user apps? probably. | |
1970 | */ | |
1971 | if (di->disc_type == 0xff) { | |
1972 | printk(DRIVER_NAME": Unknown disc. No track?\n"); | |
1973 | return 0; | |
1974 | } | |
1975 | ||
1976 | if (di->disc_type != 0x20 && di->disc_type != 0) { | |
1977 | printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type); | |
1978 | return 0; | |
1979 | } | |
1980 | ||
1981 | if (di->erasable == 0) { | |
1982 | printk(DRIVER_NAME": Disc not erasable\n"); | |
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | if (di->border_status == PACKET_SESSION_RESERVED) { | |
1987 | printk(DRIVER_NAME": Can't write to last track (reserved)\n"); | |
1988 | return 0; | |
1989 | } | |
1990 | ||
1991 | return 1; | |
1992 | } | |
1993 | ||
1994 | static int pkt_probe_settings(struct pktcdvd_device *pd) | |
1995 | { | |
1996 | struct packet_command cgc; | |
1997 | unsigned char buf[12]; | |
1998 | disc_information di; | |
1999 | track_information ti; | |
2000 | int ret, track; | |
2001 | ||
2002 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
2003 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; | |
2004 | cgc.cmd[8] = 8; | |
2005 | ret = pkt_generic_packet(pd, &cgc); | |
2006 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; | |
2007 | ||
2008 | memset(&di, 0, sizeof(disc_information)); | |
2009 | memset(&ti, 0, sizeof(track_information)); | |
2010 | ||
2011 | if ((ret = pkt_get_disc_info(pd, &di))) { | |
2012 | printk("failed get_disc\n"); | |
2013 | return ret; | |
2014 | } | |
2015 | ||
2016 | if (!pkt_writable_disc(pd, &di)) | |
2017 | return -EROFS; | |
2018 | ||
2019 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; | |
2020 | ||
2021 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ | |
2022 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { | |
2023 | printk(DRIVER_NAME": failed get_track\n"); | |
2024 | return ret; | |
2025 | } | |
2026 | ||
2027 | if (!pkt_writable_track(pd, &ti)) { | |
2028 | printk(DRIVER_NAME": can't write to this track\n"); | |
2029 | return -EROFS; | |
2030 | } | |
2031 | ||
2032 | /* | |
2033 | * we keep packet size in 512 byte units, makes it easier to | |
2034 | * deal with request calculations. | |
2035 | */ | |
2036 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; | |
2037 | if (pd->settings.size == 0) { | |
2038 | printk(DRIVER_NAME": detected zero packet size!\n"); | |
2039 | return -ENXIO; | |
2040 | } | |
2041 | if (pd->settings.size > PACKET_MAX_SECTORS) { | |
2042 | printk(DRIVER_NAME": packet size is too big\n"); | |
2043 | return -EROFS; | |
2044 | } | |
2045 | pd->settings.fp = ti.fp; | |
2046 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); | |
2047 | ||
2048 | if (ti.nwa_v) { | |
2049 | pd->nwa = be32_to_cpu(ti.next_writable); | |
2050 | set_bit(PACKET_NWA_VALID, &pd->flags); | |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * in theory we could use lra on -RW media as well and just zero | |
2055 | * blocks that haven't been written yet, but in practice that | |
2056 | * is just a no-go. we'll use that for -R, naturally. | |
2057 | */ | |
2058 | if (ti.lra_v) { | |
2059 | pd->lra = be32_to_cpu(ti.last_rec_address); | |
2060 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2061 | } else { | |
2062 | pd->lra = 0xffffffff; | |
2063 | set_bit(PACKET_LRA_VALID, &pd->flags); | |
2064 | } | |
2065 | ||
2066 | /* | |
2067 | * fine for now | |
2068 | */ | |
2069 | pd->settings.link_loss = 7; | |
2070 | pd->settings.write_type = 0; /* packet */ | |
2071 | pd->settings.track_mode = ti.track_mode; | |
2072 | ||
2073 | /* | |
2074 | * mode1 or mode2 disc | |
2075 | */ | |
2076 | switch (ti.data_mode) { | |
2077 | case PACKET_MODE1: | |
2078 | pd->settings.block_mode = PACKET_BLOCK_MODE1; | |
2079 | break; | |
2080 | case PACKET_MODE2: | |
2081 | pd->settings.block_mode = PACKET_BLOCK_MODE2; | |
2082 | break; | |
2083 | default: | |
2084 | printk(DRIVER_NAME": unknown data mode\n"); | |
2085 | return -EROFS; | |
2086 | } | |
2087 | return 0; | |
2088 | } | |
2089 | ||
2090 | /* | |
2091 | * enable/disable write caching on drive | |
2092 | */ | |
2093 | static int pkt_write_caching(struct pktcdvd_device *pd, int set) | |
2094 | { | |
2095 | struct packet_command cgc; | |
2096 | struct request_sense sense; | |
2097 | unsigned char buf[64]; | |
2098 | int ret; | |
2099 | ||
2100 | memset(buf, 0, sizeof(buf)); | |
2101 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); | |
2102 | cgc.sense = &sense; | |
2103 | cgc.buflen = pd->mode_offset + 12; | |
2104 | ||
2105 | /* | |
2106 | * caching mode page might not be there, so quiet this command | |
2107 | */ | |
2108 | cgc.quiet = 1; | |
2109 | ||
2110 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) | |
2111 | return ret; | |
2112 | ||
2113 | buf[pd->mode_offset + 10] |= (!!set << 2); | |
2114 | ||
2115 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); | |
2116 | ret = pkt_mode_select(pd, &cgc); | |
2117 | if (ret) { | |
2118 | printk(DRIVER_NAME": write caching control failed\n"); | |
2119 | pkt_dump_sense(&cgc); | |
2120 | } else if (!ret && set) | |
2121 | printk(DRIVER_NAME": enabled write caching on %s\n", pd->name); | |
2122 | return ret; | |
2123 | } | |
2124 | ||
2125 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) | |
2126 | { | |
2127 | struct packet_command cgc; | |
2128 | ||
2129 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2130 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; | |
2131 | cgc.cmd[4] = lockflag ? 1 : 0; | |
2132 | return pkt_generic_packet(pd, &cgc); | |
2133 | } | |
2134 | ||
2135 | /* | |
2136 | * Returns drive maximum write speed | |
2137 | */ | |
2138 | static int pkt_get_max_speed(struct pktcdvd_device *pd, unsigned *write_speed) | |
2139 | { | |
2140 | struct packet_command cgc; | |
2141 | struct request_sense sense; | |
2142 | unsigned char buf[256+18]; | |
2143 | unsigned char *cap_buf; | |
2144 | int ret, offset; | |
2145 | ||
2146 | memset(buf, 0, sizeof(buf)); | |
2147 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; | |
2148 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); | |
2149 | cgc.sense = &sense; | |
2150 | ||
2151 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2152 | if (ret) { | |
2153 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + | |
2154 | sizeof(struct mode_page_header); | |
2155 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); | |
2156 | if (ret) { | |
2157 | pkt_dump_sense(&cgc); | |
2158 | return ret; | |
2159 | } | |
2160 | } | |
2161 | ||
2162 | offset = 20; /* Obsoleted field, used by older drives */ | |
2163 | if (cap_buf[1] >= 28) | |
2164 | offset = 28; /* Current write speed selected */ | |
2165 | if (cap_buf[1] >= 30) { | |
2166 | /* If the drive reports at least one "Logical Unit Write | |
2167 | * Speed Performance Descriptor Block", use the information | |
2168 | * in the first block. (contains the highest speed) | |
2169 | */ | |
2170 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; | |
2171 | if (num_spdb > 0) | |
2172 | offset = 34; | |
2173 | } | |
2174 | ||
2175 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; | |
2176 | return 0; | |
2177 | } | |
2178 | ||
2179 | /* These tables from cdrecord - I don't have orange book */ | |
2180 | /* standard speed CD-RW (1-4x) */ | |
2181 | static char clv_to_speed[16] = { | |
2182 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2183 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2184 | }; | |
2185 | /* high speed CD-RW (-10x) */ | |
2186 | static char hs_clv_to_speed[16] = { | |
2187 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2188 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
2189 | }; | |
2190 | /* ultra high speed CD-RW */ | |
2191 | static char us_clv_to_speed[16] = { | |
2192 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ | |
2193 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 | |
2194 | }; | |
2195 | ||
2196 | /* | |
2197 | * reads the maximum media speed from ATIP | |
2198 | */ | |
2199 | static int pkt_media_speed(struct pktcdvd_device *pd, unsigned *speed) | |
2200 | { | |
2201 | struct packet_command cgc; | |
2202 | struct request_sense sense; | |
2203 | unsigned char buf[64]; | |
2204 | unsigned int size, st, sp; | |
2205 | int ret; | |
2206 | ||
2207 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); | |
2208 | cgc.sense = &sense; | |
2209 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2210 | cgc.cmd[1] = 2; | |
2211 | cgc.cmd[2] = 4; /* READ ATIP */ | |
2212 | cgc.cmd[8] = 2; | |
2213 | ret = pkt_generic_packet(pd, &cgc); | |
2214 | if (ret) { | |
2215 | pkt_dump_sense(&cgc); | |
2216 | return ret; | |
2217 | } | |
2218 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; | |
2219 | if (size > sizeof(buf)) | |
2220 | size = sizeof(buf); | |
2221 | ||
2222 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); | |
2223 | cgc.sense = &sense; | |
2224 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; | |
2225 | cgc.cmd[1] = 2; | |
2226 | cgc.cmd[2] = 4; | |
2227 | cgc.cmd[8] = size; | |
2228 | ret = pkt_generic_packet(pd, &cgc); | |
2229 | if (ret) { | |
2230 | pkt_dump_sense(&cgc); | |
2231 | return ret; | |
2232 | } | |
2233 | ||
2234 | if (!buf[6] & 0x40) { | |
2235 | printk(DRIVER_NAME": Disc type is not CD-RW\n"); | |
2236 | return 1; | |
2237 | } | |
2238 | if (!buf[6] & 0x4) { | |
2239 | printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n"); | |
2240 | return 1; | |
2241 | } | |
2242 | ||
2243 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ | |
2244 | ||
2245 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ | |
2246 | ||
2247 | /* Info from cdrecord */ | |
2248 | switch (st) { | |
2249 | case 0: /* standard speed */ | |
2250 | *speed = clv_to_speed[sp]; | |
2251 | break; | |
2252 | case 1: /* high speed */ | |
2253 | *speed = hs_clv_to_speed[sp]; | |
2254 | break; | |
2255 | case 2: /* ultra high speed */ | |
2256 | *speed = us_clv_to_speed[sp]; | |
2257 | break; | |
2258 | default: | |
2259 | printk(DRIVER_NAME": Unknown disc sub-type %d\n",st); | |
2260 | return 1; | |
2261 | } | |
2262 | if (*speed) { | |
2263 | printk(DRIVER_NAME": Max. media speed: %d\n",*speed); | |
2264 | return 0; | |
2265 | } else { | |
2266 | printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st); | |
2267 | return 1; | |
2268 | } | |
2269 | } | |
2270 | ||
2271 | static int pkt_perform_opc(struct pktcdvd_device *pd) | |
2272 | { | |
2273 | struct packet_command cgc; | |
2274 | struct request_sense sense; | |
2275 | int ret; | |
2276 | ||
2277 | VPRINTK(DRIVER_NAME": Performing OPC\n"); | |
2278 | ||
2279 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); | |
2280 | cgc.sense = &sense; | |
2281 | cgc.timeout = 60*HZ; | |
2282 | cgc.cmd[0] = GPCMD_SEND_OPC; | |
2283 | cgc.cmd[1] = 1; | |
2284 | if ((ret = pkt_generic_packet(pd, &cgc))) | |
2285 | pkt_dump_sense(&cgc); | |
2286 | return ret; | |
2287 | } | |
2288 | ||
2289 | static int pkt_open_write(struct pktcdvd_device *pd) | |
2290 | { | |
2291 | int ret; | |
2292 | unsigned int write_speed, media_write_speed, read_speed; | |
2293 | ||
2294 | if ((ret = pkt_probe_settings(pd))) { | |
2295 | VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name); | |
2296 | return ret; | |
2297 | } | |
2298 | ||
2299 | if ((ret = pkt_set_write_settings(pd))) { | |
2300 | DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name); | |
2301 | return -EIO; | |
2302 | } | |
2303 | ||
2304 | pkt_write_caching(pd, USE_WCACHING); | |
2305 | ||
2306 | if ((ret = pkt_get_max_speed(pd, &write_speed))) | |
2307 | write_speed = 16 * 177; | |
2308 | switch (pd->mmc3_profile) { | |
2309 | case 0x13: /* DVD-RW */ | |
2310 | case 0x1a: /* DVD+RW */ | |
2311 | case 0x12: /* DVD-RAM */ | |
2312 | DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed); | |
2313 | break; | |
2314 | default: | |
2315 | if ((ret = pkt_media_speed(pd, &media_write_speed))) | |
2316 | media_write_speed = 16; | |
2317 | write_speed = min(write_speed, media_write_speed * 177); | |
2318 | DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176); | |
2319 | break; | |
2320 | } | |
2321 | read_speed = write_speed; | |
2322 | ||
2323 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { | |
2324 | DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name); | |
2325 | return -EIO; | |
2326 | } | |
2327 | pd->write_speed = write_speed; | |
2328 | pd->read_speed = read_speed; | |
2329 | ||
2330 | if ((ret = pkt_perform_opc(pd))) { | |
2331 | DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name); | |
2332 | } | |
2333 | ||
2334 | return 0; | |
2335 | } | |
2336 | ||
2337 | /* | |
2338 | * called at open time. | |
2339 | */ | |
2340 | static int pkt_open_dev(struct pktcdvd_device *pd, int write) | |
2341 | { | |
2342 | int ret; | |
2343 | long lba; | |
2344 | request_queue_t *q; | |
2345 | ||
2346 | /* | |
2347 | * We need to re-open the cdrom device without O_NONBLOCK to be able | |
2348 | * to read/write from/to it. It is already opened in O_NONBLOCK mode | |
2349 | * so bdget() can't fail. | |
2350 | */ | |
2351 | bdget(pd->bdev->bd_dev); | |
2352 | if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY))) | |
2353 | goto out; | |
2354 | ||
2355 | if ((ret = bd_claim(pd->bdev, pd))) | |
2356 | goto out_putdev; | |
2357 | ||
2358 | if ((ret = pkt_get_last_written(pd, &lba))) { | |
2359 | printk(DRIVER_NAME": pkt_get_last_written failed\n"); | |
2360 | goto out_unclaim; | |
2361 | } | |
2362 | ||
2363 | set_capacity(pd->disk, lba << 2); | |
2364 | set_capacity(pd->bdev->bd_disk, lba << 2); | |
2365 | bd_set_size(pd->bdev, (loff_t)lba << 11); | |
2366 | ||
2367 | q = bdev_get_queue(pd->bdev); | |
2368 | if (write) { | |
2369 | if ((ret = pkt_open_write(pd))) | |
2370 | goto out_unclaim; | |
2371 | /* | |
2372 | * Some CDRW drives can not handle writes larger than one packet, | |
2373 | * even if the size is a multiple of the packet size. | |
2374 | */ | |
2375 | spin_lock_irq(q->queue_lock); | |
2376 | blk_queue_max_sectors(q, pd->settings.size); | |
2377 | spin_unlock_irq(q->queue_lock); | |
2378 | set_bit(PACKET_WRITABLE, &pd->flags); | |
2379 | } else { | |
2380 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2381 | clear_bit(PACKET_WRITABLE, &pd->flags); | |
2382 | } | |
2383 | ||
2384 | if ((ret = pkt_set_segment_merging(pd, q))) | |
2385 | goto out_unclaim; | |
2386 | ||
2387 | if (write) { | |
2388 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { | |
2389 | printk(DRIVER_NAME": not enough memory for buffers\n"); | |
2390 | ret = -ENOMEM; | |
2391 | goto out_unclaim; | |
2392 | } | |
2393 | printk(DRIVER_NAME": %lukB available on disc\n", lba << 1); | |
2394 | } | |
2395 | ||
2396 | return 0; | |
2397 | ||
2398 | out_unclaim: | |
2399 | bd_release(pd->bdev); | |
2400 | out_putdev: | |
2401 | blkdev_put(pd->bdev); | |
2402 | out: | |
2403 | return ret; | |
2404 | } | |
2405 | ||
2406 | /* | |
2407 | * called when the device is closed. makes sure that the device flushes | |
2408 | * the internal cache before we close. | |
2409 | */ | |
2410 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) | |
2411 | { | |
2412 | if (flush && pkt_flush_cache(pd)) | |
2413 | DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name); | |
2414 | ||
2415 | pkt_lock_door(pd, 0); | |
2416 | ||
2417 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); | |
2418 | bd_release(pd->bdev); | |
2419 | blkdev_put(pd->bdev); | |
2420 | ||
2421 | pkt_shrink_pktlist(pd); | |
2422 | } | |
2423 | ||
2424 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) | |
2425 | { | |
2426 | if (dev_minor >= MAX_WRITERS) | |
2427 | return NULL; | |
2428 | return pkt_devs[dev_minor]; | |
2429 | } | |
2430 | ||
2431 | static int pkt_open(struct inode *inode, struct file *file) | |
2432 | { | |
2433 | struct pktcdvd_device *pd = NULL; | |
2434 | int ret; | |
2435 | ||
2436 | VPRINTK(DRIVER_NAME": entering open\n"); | |
2437 | ||
2438 | mutex_lock(&ctl_mutex); | |
2439 | pd = pkt_find_dev_from_minor(iminor(inode)); | |
2440 | if (!pd) { | |
2441 | ret = -ENODEV; | |
2442 | goto out; | |
2443 | } | |
2444 | BUG_ON(pd->refcnt < 0); | |
2445 | ||
2446 | pd->refcnt++; | |
2447 | if (pd->refcnt > 1) { | |
2448 | if ((file->f_mode & FMODE_WRITE) && | |
2449 | !test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2450 | ret = -EBUSY; | |
2451 | goto out_dec; | |
2452 | } | |
2453 | } else { | |
2454 | ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE); | |
2455 | if (ret) | |
2456 | goto out_dec; | |
2457 | /* | |
2458 | * needed here as well, since ext2 (among others) may change | |
2459 | * the blocksize at mount time | |
2460 | */ | |
2461 | set_blocksize(inode->i_bdev, CD_FRAMESIZE); | |
2462 | } | |
2463 | ||
2464 | mutex_unlock(&ctl_mutex); | |
2465 | return 0; | |
2466 | ||
2467 | out_dec: | |
2468 | pd->refcnt--; | |
2469 | out: | |
2470 | VPRINTK(DRIVER_NAME": failed open (%d)\n", ret); | |
2471 | mutex_unlock(&ctl_mutex); | |
2472 | return ret; | |
2473 | } | |
2474 | ||
2475 | static int pkt_close(struct inode *inode, struct file *file) | |
2476 | { | |
2477 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2478 | int ret = 0; | |
2479 | ||
2480 | mutex_lock(&ctl_mutex); | |
2481 | pd->refcnt--; | |
2482 | BUG_ON(pd->refcnt < 0); | |
2483 | if (pd->refcnt == 0) { | |
2484 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); | |
2485 | pkt_release_dev(pd, flush); | |
2486 | } | |
2487 | mutex_unlock(&ctl_mutex); | |
2488 | return ret; | |
2489 | } | |
2490 | ||
2491 | ||
2492 | static int pkt_end_io_read_cloned(struct bio *bio, unsigned int bytes_done, int err) | |
2493 | { | |
2494 | struct packet_stacked_data *psd = bio->bi_private; | |
2495 | struct pktcdvd_device *pd = psd->pd; | |
2496 | ||
2497 | if (bio->bi_size) | |
2498 | return 1; | |
2499 | ||
2500 | bio_put(bio); | |
2501 | bio_endio(psd->bio, psd->bio->bi_size, err); | |
2502 | mempool_free(psd, psd_pool); | |
2503 | pkt_bio_finished(pd); | |
2504 | return 0; | |
2505 | } | |
2506 | ||
2507 | static int pkt_make_request(request_queue_t *q, struct bio *bio) | |
2508 | { | |
2509 | struct pktcdvd_device *pd; | |
2510 | char b[BDEVNAME_SIZE]; | |
2511 | sector_t zone; | |
2512 | struct packet_data *pkt; | |
2513 | int was_empty, blocked_bio; | |
2514 | struct pkt_rb_node *node; | |
2515 | ||
2516 | pd = q->queuedata; | |
2517 | if (!pd) { | |
2518 | printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); | |
2519 | goto end_io; | |
2520 | } | |
2521 | ||
2522 | /* | |
2523 | * Clone READ bios so we can have our own bi_end_io callback. | |
2524 | */ | |
2525 | if (bio_data_dir(bio) == READ) { | |
2526 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); | |
2527 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); | |
2528 | ||
2529 | psd->pd = pd; | |
2530 | psd->bio = bio; | |
2531 | cloned_bio->bi_bdev = pd->bdev; | |
2532 | cloned_bio->bi_private = psd; | |
2533 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; | |
2534 | pd->stats.secs_r += bio->bi_size >> 9; | |
2535 | pkt_queue_bio(pd, cloned_bio); | |
2536 | return 0; | |
2537 | } | |
2538 | ||
2539 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { | |
2540 | printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n", | |
2541 | pd->name, (unsigned long long)bio->bi_sector); | |
2542 | goto end_io; | |
2543 | } | |
2544 | ||
2545 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { | |
2546 | printk(DRIVER_NAME": wrong bio size\n"); | |
2547 | goto end_io; | |
2548 | } | |
2549 | ||
2550 | blk_queue_bounce(q, &bio); | |
2551 | ||
2552 | zone = ZONE(bio->bi_sector, pd); | |
2553 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", | |
2554 | (unsigned long long)bio->bi_sector, | |
2555 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); | |
2556 | ||
2557 | /* Check if we have to split the bio */ | |
2558 | { | |
2559 | struct bio_pair *bp; | |
2560 | sector_t last_zone; | |
2561 | int first_sectors; | |
2562 | ||
2563 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); | |
2564 | if (last_zone != zone) { | |
2565 | BUG_ON(last_zone != zone + pd->settings.size); | |
2566 | first_sectors = last_zone - bio->bi_sector; | |
2567 | bp = bio_split(bio, bio_split_pool, first_sectors); | |
2568 | BUG_ON(!bp); | |
2569 | pkt_make_request(q, &bp->bio1); | |
2570 | pkt_make_request(q, &bp->bio2); | |
2571 | bio_pair_release(bp); | |
2572 | return 0; | |
2573 | } | |
2574 | } | |
2575 | ||
2576 | /* | |
2577 | * If we find a matching packet in state WAITING or READ_WAIT, we can | |
2578 | * just append this bio to that packet. | |
2579 | */ | |
2580 | spin_lock(&pd->cdrw.active_list_lock); | |
2581 | blocked_bio = 0; | |
2582 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { | |
2583 | if (pkt->sector == zone) { | |
2584 | spin_lock(&pkt->lock); | |
2585 | if ((pkt->state == PACKET_WAITING_STATE) || | |
2586 | (pkt->state == PACKET_READ_WAIT_STATE)) { | |
2587 | pkt_add_list_last(bio, &pkt->orig_bios, | |
2588 | &pkt->orig_bios_tail); | |
2589 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; | |
2590 | if ((pkt->write_size >= pkt->frames) && | |
2591 | (pkt->state == PACKET_WAITING_STATE)) { | |
2592 | atomic_inc(&pkt->run_sm); | |
2593 | wake_up(&pd->wqueue); | |
2594 | } | |
2595 | spin_unlock(&pkt->lock); | |
2596 | spin_unlock(&pd->cdrw.active_list_lock); | |
2597 | return 0; | |
2598 | } else { | |
2599 | blocked_bio = 1; | |
2600 | } | |
2601 | spin_unlock(&pkt->lock); | |
2602 | } | |
2603 | } | |
2604 | spin_unlock(&pd->cdrw.active_list_lock); | |
2605 | ||
2606 | /* | |
2607 | * Test if there is enough room left in the bio work queue | |
2608 | * (queue size >= congestion on mark). | |
2609 | * If not, wait till the work queue size is below the congestion off mark. | |
2610 | */ | |
2611 | spin_lock(&pd->lock); | |
2612 | if (pd->write_congestion_on > 0 | |
2613 | && pd->bio_queue_size >= pd->write_congestion_on) { | |
2614 | blk_set_queue_congested(q, WRITE); | |
2615 | do { | |
2616 | spin_unlock(&pd->lock); | |
2617 | congestion_wait(WRITE, HZ); | |
2618 | spin_lock(&pd->lock); | |
2619 | } while(pd->bio_queue_size > pd->write_congestion_off); | |
2620 | } | |
2621 | spin_unlock(&pd->lock); | |
2622 | ||
2623 | /* | |
2624 | * No matching packet found. Store the bio in the work queue. | |
2625 | */ | |
2626 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); | |
2627 | node->bio = bio; | |
2628 | spin_lock(&pd->lock); | |
2629 | BUG_ON(pd->bio_queue_size < 0); | |
2630 | was_empty = (pd->bio_queue_size == 0); | |
2631 | pkt_rbtree_insert(pd, node); | |
2632 | spin_unlock(&pd->lock); | |
2633 | ||
2634 | /* | |
2635 | * Wake up the worker thread. | |
2636 | */ | |
2637 | atomic_set(&pd->scan_queue, 1); | |
2638 | if (was_empty) { | |
2639 | /* This wake_up is required for correct operation */ | |
2640 | wake_up(&pd->wqueue); | |
2641 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { | |
2642 | /* | |
2643 | * This wake up is not required for correct operation, | |
2644 | * but improves performance in some cases. | |
2645 | */ | |
2646 | wake_up(&pd->wqueue); | |
2647 | } | |
2648 | return 0; | |
2649 | end_io: | |
2650 | bio_io_error(bio, bio->bi_size); | |
2651 | return 0; | |
2652 | } | |
2653 | ||
2654 | ||
2655 | ||
2656 | static int pkt_merge_bvec(request_queue_t *q, struct bio *bio, struct bio_vec *bvec) | |
2657 | { | |
2658 | struct pktcdvd_device *pd = q->queuedata; | |
2659 | sector_t zone = ZONE(bio->bi_sector, pd); | |
2660 | int used = ((bio->bi_sector - zone) << 9) + bio->bi_size; | |
2661 | int remaining = (pd->settings.size << 9) - used; | |
2662 | int remaining2; | |
2663 | ||
2664 | /* | |
2665 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet | |
2666 | * boundary, pkt_make_request() will split the bio. | |
2667 | */ | |
2668 | remaining2 = PAGE_SIZE - bio->bi_size; | |
2669 | remaining = max(remaining, remaining2); | |
2670 | ||
2671 | BUG_ON(remaining < 0); | |
2672 | return remaining; | |
2673 | } | |
2674 | ||
2675 | static void pkt_init_queue(struct pktcdvd_device *pd) | |
2676 | { | |
2677 | request_queue_t *q = pd->disk->queue; | |
2678 | ||
2679 | blk_queue_make_request(q, pkt_make_request); | |
2680 | blk_queue_hardsect_size(q, CD_FRAMESIZE); | |
2681 | blk_queue_max_sectors(q, PACKET_MAX_SECTORS); | |
2682 | blk_queue_merge_bvec(q, pkt_merge_bvec); | |
2683 | q->queuedata = pd; | |
2684 | } | |
2685 | ||
2686 | static int pkt_seq_show(struct seq_file *m, void *p) | |
2687 | { | |
2688 | struct pktcdvd_device *pd = m->private; | |
2689 | char *msg; | |
2690 | char bdev_buf[BDEVNAME_SIZE]; | |
2691 | int states[PACKET_NUM_STATES]; | |
2692 | ||
2693 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, | |
2694 | bdevname(pd->bdev, bdev_buf)); | |
2695 | ||
2696 | seq_printf(m, "\nSettings:\n"); | |
2697 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); | |
2698 | ||
2699 | if (pd->settings.write_type == 0) | |
2700 | msg = "Packet"; | |
2701 | else | |
2702 | msg = "Unknown"; | |
2703 | seq_printf(m, "\twrite type:\t\t%s\n", msg); | |
2704 | ||
2705 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); | |
2706 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); | |
2707 | ||
2708 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); | |
2709 | ||
2710 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) | |
2711 | msg = "Mode 1"; | |
2712 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) | |
2713 | msg = "Mode 2"; | |
2714 | else | |
2715 | msg = "Unknown"; | |
2716 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); | |
2717 | ||
2718 | seq_printf(m, "\nStatistics:\n"); | |
2719 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); | |
2720 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); | |
2721 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); | |
2722 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); | |
2723 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); | |
2724 | ||
2725 | seq_printf(m, "\nMisc:\n"); | |
2726 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); | |
2727 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); | |
2728 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); | |
2729 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); | |
2730 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); | |
2731 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); | |
2732 | ||
2733 | seq_printf(m, "\nQueue state:\n"); | |
2734 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); | |
2735 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); | |
2736 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); | |
2737 | ||
2738 | pkt_count_states(pd, states); | |
2739 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", | |
2740 | states[0], states[1], states[2], states[3], states[4], states[5]); | |
2741 | ||
2742 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", | |
2743 | pd->write_congestion_off, | |
2744 | pd->write_congestion_on); | |
2745 | return 0; | |
2746 | } | |
2747 | ||
2748 | static int pkt_seq_open(struct inode *inode, struct file *file) | |
2749 | { | |
2750 | return single_open(file, pkt_seq_show, PDE(inode)->data); | |
2751 | } | |
2752 | ||
2753 | static struct file_operations pkt_proc_fops = { | |
2754 | .open = pkt_seq_open, | |
2755 | .read = seq_read, | |
2756 | .llseek = seq_lseek, | |
2757 | .release = single_release | |
2758 | }; | |
2759 | ||
2760 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) | |
2761 | { | |
2762 | int i; | |
2763 | int ret = 0; | |
2764 | char b[BDEVNAME_SIZE]; | |
2765 | struct proc_dir_entry *proc; | |
2766 | struct block_device *bdev; | |
2767 | ||
2768 | if (pd->pkt_dev == dev) { | |
2769 | printk(DRIVER_NAME": Recursive setup not allowed\n"); | |
2770 | return -EBUSY; | |
2771 | } | |
2772 | for (i = 0; i < MAX_WRITERS; i++) { | |
2773 | struct pktcdvd_device *pd2 = pkt_devs[i]; | |
2774 | if (!pd2) | |
2775 | continue; | |
2776 | if (pd2->bdev->bd_dev == dev) { | |
2777 | printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b)); | |
2778 | return -EBUSY; | |
2779 | } | |
2780 | if (pd2->pkt_dev == dev) { | |
2781 | printk(DRIVER_NAME": Can't chain pktcdvd devices\n"); | |
2782 | return -EBUSY; | |
2783 | } | |
2784 | } | |
2785 | ||
2786 | bdev = bdget(dev); | |
2787 | if (!bdev) | |
2788 | return -ENOMEM; | |
2789 | ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK); | |
2790 | if (ret) | |
2791 | return ret; | |
2792 | ||
2793 | /* This is safe, since we have a reference from open(). */ | |
2794 | __module_get(THIS_MODULE); | |
2795 | ||
2796 | pd->bdev = bdev; | |
2797 | set_blocksize(bdev, CD_FRAMESIZE); | |
2798 | ||
2799 | pkt_init_queue(pd); | |
2800 | ||
2801 | atomic_set(&pd->cdrw.pending_bios, 0); | |
2802 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); | |
2803 | if (IS_ERR(pd->cdrw.thread)) { | |
2804 | printk(DRIVER_NAME": can't start kernel thread\n"); | |
2805 | ret = -ENOMEM; | |
2806 | goto out_mem; | |
2807 | } | |
2808 | ||
2809 | proc = create_proc_entry(pd->name, 0, pkt_proc); | |
2810 | if (proc) { | |
2811 | proc->data = pd; | |
2812 | proc->proc_fops = &pkt_proc_fops; | |
2813 | } | |
2814 | DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); | |
2815 | return 0; | |
2816 | ||
2817 | out_mem: | |
2818 | blkdev_put(bdev); | |
2819 | /* This is safe: open() is still holding a reference. */ | |
2820 | module_put(THIS_MODULE); | |
2821 | return ret; | |
2822 | } | |
2823 | ||
2824 | static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
2825 | { | |
2826 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; | |
2827 | ||
2828 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode)); | |
2829 | ||
2830 | switch (cmd) { | |
2831 | /* | |
2832 | * forward selected CDROM ioctls to CD-ROM, for UDF | |
2833 | */ | |
2834 | case CDROMMULTISESSION: | |
2835 | case CDROMREADTOCENTRY: | |
2836 | case CDROM_LAST_WRITTEN: | |
2837 | case CDROM_SEND_PACKET: | |
2838 | case SCSI_IOCTL_SEND_COMMAND: | |
2839 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); | |
2840 | ||
2841 | case CDROMEJECT: | |
2842 | /* | |
2843 | * The door gets locked when the device is opened, so we | |
2844 | * have to unlock it or else the eject command fails. | |
2845 | */ | |
2846 | if (pd->refcnt == 1) | |
2847 | pkt_lock_door(pd, 0); | |
2848 | return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); | |
2849 | ||
2850 | default: | |
2851 | VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd); | |
2852 | return -ENOTTY; | |
2853 | } | |
2854 | ||
2855 | return 0; | |
2856 | } | |
2857 | ||
2858 | static int pkt_media_changed(struct gendisk *disk) | |
2859 | { | |
2860 | struct pktcdvd_device *pd = disk->private_data; | |
2861 | struct gendisk *attached_disk; | |
2862 | ||
2863 | if (!pd) | |
2864 | return 0; | |
2865 | if (!pd->bdev) | |
2866 | return 0; | |
2867 | attached_disk = pd->bdev->bd_disk; | |
2868 | if (!attached_disk) | |
2869 | return 0; | |
2870 | return attached_disk->fops->media_changed(attached_disk); | |
2871 | } | |
2872 | ||
2873 | static struct block_device_operations pktcdvd_ops = { | |
2874 | .owner = THIS_MODULE, | |
2875 | .open = pkt_open, | |
2876 | .release = pkt_close, | |
2877 | .ioctl = pkt_ioctl, | |
2878 | .media_changed = pkt_media_changed, | |
2879 | }; | |
2880 | ||
2881 | /* | |
2882 | * Set up mapping from pktcdvd device to CD-ROM device. | |
2883 | */ | |
2884 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) | |
2885 | { | |
2886 | int idx; | |
2887 | int ret = -ENOMEM; | |
2888 | struct pktcdvd_device *pd; | |
2889 | struct gendisk *disk; | |
2890 | ||
2891 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2892 | ||
2893 | for (idx = 0; idx < MAX_WRITERS; idx++) | |
2894 | if (!pkt_devs[idx]) | |
2895 | break; | |
2896 | if (idx == MAX_WRITERS) { | |
2897 | printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS); | |
2898 | ret = -EBUSY; | |
2899 | goto out_mutex; | |
2900 | } | |
2901 | ||
2902 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); | |
2903 | if (!pd) | |
2904 | goto out_mutex; | |
2905 | ||
2906 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, | |
2907 | sizeof(struct pkt_rb_node)); | |
2908 | if (!pd->rb_pool) | |
2909 | goto out_mem; | |
2910 | ||
2911 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); | |
2912 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); | |
2913 | spin_lock_init(&pd->cdrw.active_list_lock); | |
2914 | ||
2915 | spin_lock_init(&pd->lock); | |
2916 | spin_lock_init(&pd->iosched.lock); | |
2917 | sprintf(pd->name, DRIVER_NAME"%d", idx); | |
2918 | init_waitqueue_head(&pd->wqueue); | |
2919 | pd->bio_queue = RB_ROOT; | |
2920 | ||
2921 | pd->write_congestion_on = write_congestion_on; | |
2922 | pd->write_congestion_off = write_congestion_off; | |
2923 | ||
2924 | disk = alloc_disk(1); | |
2925 | if (!disk) | |
2926 | goto out_mem; | |
2927 | pd->disk = disk; | |
2928 | disk->major = pktdev_major; | |
2929 | disk->first_minor = idx; | |
2930 | disk->fops = &pktcdvd_ops; | |
2931 | disk->flags = GENHD_FL_REMOVABLE; | |
2932 | strcpy(disk->disk_name, pd->name); | |
2933 | disk->private_data = pd; | |
2934 | disk->queue = blk_alloc_queue(GFP_KERNEL); | |
2935 | if (!disk->queue) | |
2936 | goto out_mem2; | |
2937 | ||
2938 | pd->pkt_dev = MKDEV(disk->major, disk->first_minor); | |
2939 | ret = pkt_new_dev(pd, dev); | |
2940 | if (ret) | |
2941 | goto out_new_dev; | |
2942 | ||
2943 | add_disk(disk); | |
2944 | ||
2945 | pkt_sysfs_dev_new(pd); | |
2946 | pkt_debugfs_dev_new(pd); | |
2947 | ||
2948 | pkt_devs[idx] = pd; | |
2949 | if (pkt_dev) | |
2950 | *pkt_dev = pd->pkt_dev; | |
2951 | ||
2952 | mutex_unlock(&ctl_mutex); | |
2953 | return 0; | |
2954 | ||
2955 | out_new_dev: | |
2956 | blk_cleanup_queue(disk->queue); | |
2957 | out_mem2: | |
2958 | put_disk(disk); | |
2959 | out_mem: | |
2960 | if (pd->rb_pool) | |
2961 | mempool_destroy(pd->rb_pool); | |
2962 | kfree(pd); | |
2963 | out_mutex: | |
2964 | mutex_unlock(&ctl_mutex); | |
2965 | printk(DRIVER_NAME": setup of pktcdvd device failed\n"); | |
2966 | return ret; | |
2967 | } | |
2968 | ||
2969 | /* | |
2970 | * Tear down mapping from pktcdvd device to CD-ROM device. | |
2971 | */ | |
2972 | static int pkt_remove_dev(dev_t pkt_dev) | |
2973 | { | |
2974 | struct pktcdvd_device *pd; | |
2975 | int idx; | |
2976 | int ret = 0; | |
2977 | ||
2978 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
2979 | ||
2980 | for (idx = 0; idx < MAX_WRITERS; idx++) { | |
2981 | pd = pkt_devs[idx]; | |
2982 | if (pd && (pd->pkt_dev == pkt_dev)) | |
2983 | break; | |
2984 | } | |
2985 | if (idx == MAX_WRITERS) { | |
2986 | DPRINTK(DRIVER_NAME": dev not setup\n"); | |
2987 | ret = -ENXIO; | |
2988 | goto out; | |
2989 | } | |
2990 | ||
2991 | if (pd->refcnt > 0) { | |
2992 | ret = -EBUSY; | |
2993 | goto out; | |
2994 | } | |
2995 | if (!IS_ERR(pd->cdrw.thread)) | |
2996 | kthread_stop(pd->cdrw.thread); | |
2997 | ||
2998 | pkt_devs[idx] = NULL; | |
2999 | ||
3000 | pkt_debugfs_dev_remove(pd); | |
3001 | pkt_sysfs_dev_remove(pd); | |
3002 | ||
3003 | blkdev_put(pd->bdev); | |
3004 | ||
3005 | remove_proc_entry(pd->name, pkt_proc); | |
3006 | DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name); | |
3007 | ||
3008 | del_gendisk(pd->disk); | |
3009 | blk_cleanup_queue(pd->disk->queue); | |
3010 | put_disk(pd->disk); | |
3011 | ||
3012 | mempool_destroy(pd->rb_pool); | |
3013 | kfree(pd); | |
3014 | ||
3015 | /* This is safe: open() is still holding a reference. */ | |
3016 | module_put(THIS_MODULE); | |
3017 | ||
3018 | out: | |
3019 | mutex_unlock(&ctl_mutex); | |
3020 | return ret; | |
3021 | } | |
3022 | ||
3023 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) | |
3024 | { | |
3025 | struct pktcdvd_device *pd; | |
3026 | ||
3027 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); | |
3028 | ||
3029 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); | |
3030 | if (pd) { | |
3031 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); | |
3032 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); | |
3033 | } else { | |
3034 | ctrl_cmd->dev = 0; | |
3035 | ctrl_cmd->pkt_dev = 0; | |
3036 | } | |
3037 | ctrl_cmd->num_devices = MAX_WRITERS; | |
3038 | ||
3039 | mutex_unlock(&ctl_mutex); | |
3040 | } | |
3041 | ||
3042 | static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
3043 | { | |
3044 | void __user *argp = (void __user *)arg; | |
3045 | struct pkt_ctrl_command ctrl_cmd; | |
3046 | int ret = 0; | |
3047 | dev_t pkt_dev = 0; | |
3048 | ||
3049 | if (cmd != PACKET_CTRL_CMD) | |
3050 | return -ENOTTY; | |
3051 | ||
3052 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) | |
3053 | return -EFAULT; | |
3054 | ||
3055 | switch (ctrl_cmd.command) { | |
3056 | case PKT_CTRL_CMD_SETUP: | |
3057 | if (!capable(CAP_SYS_ADMIN)) | |
3058 | return -EPERM; | |
3059 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); | |
3060 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); | |
3061 | break; | |
3062 | case PKT_CTRL_CMD_TEARDOWN: | |
3063 | if (!capable(CAP_SYS_ADMIN)) | |
3064 | return -EPERM; | |
3065 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); | |
3066 | break; | |
3067 | case PKT_CTRL_CMD_STATUS: | |
3068 | pkt_get_status(&ctrl_cmd); | |
3069 | break; | |
3070 | default: | |
3071 | return -ENOTTY; | |
3072 | } | |
3073 | ||
3074 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) | |
3075 | return -EFAULT; | |
3076 | return ret; | |
3077 | } | |
3078 | ||
3079 | ||
3080 | static struct file_operations pkt_ctl_fops = { | |
3081 | .ioctl = pkt_ctl_ioctl, | |
3082 | .owner = THIS_MODULE, | |
3083 | }; | |
3084 | ||
3085 | static struct miscdevice pkt_misc = { | |
3086 | .minor = MISC_DYNAMIC_MINOR, | |
3087 | .name = DRIVER_NAME, | |
3088 | .fops = &pkt_ctl_fops | |
3089 | }; | |
3090 | ||
3091 | static int __init pkt_init(void) | |
3092 | { | |
3093 | int ret; | |
3094 | ||
3095 | mutex_init(&ctl_mutex); | |
3096 | ||
3097 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, | |
3098 | sizeof(struct packet_stacked_data)); | |
3099 | if (!psd_pool) | |
3100 | return -ENOMEM; | |
3101 | ||
3102 | ret = register_blkdev(pktdev_major, DRIVER_NAME); | |
3103 | if (ret < 0) { | |
3104 | printk(DRIVER_NAME": Unable to register block device\n"); | |
3105 | goto out2; | |
3106 | } | |
3107 | if (!pktdev_major) | |
3108 | pktdev_major = ret; | |
3109 | ||
3110 | ret = pkt_sysfs_init(); | |
3111 | if (ret) | |
3112 | goto out; | |
3113 | ||
3114 | pkt_debugfs_init(); | |
3115 | ||
3116 | ret = misc_register(&pkt_misc); | |
3117 | if (ret) { | |
3118 | printk(DRIVER_NAME": Unable to register misc device\n"); | |
3119 | goto out_misc; | |
3120 | } | |
3121 | ||
3122 | pkt_proc = proc_mkdir(DRIVER_NAME, proc_root_driver); | |
3123 | ||
3124 | return 0; | |
3125 | ||
3126 | out_misc: | |
3127 | pkt_debugfs_cleanup(); | |
3128 | pkt_sysfs_cleanup(); | |
3129 | out: | |
3130 | unregister_blkdev(pktdev_major, DRIVER_NAME); | |
3131 | out2: | |
3132 | mempool_destroy(psd_pool); | |
3133 | return ret; | |
3134 | } | |
3135 | ||
3136 | static void __exit pkt_exit(void) | |
3137 | { | |
3138 | remove_proc_entry(DRIVER_NAME, proc_root_driver); | |
3139 | misc_deregister(&pkt_misc); | |
3140 | ||
3141 | pkt_debugfs_cleanup(); | |
3142 | pkt_sysfs_cleanup(); | |
3143 | ||
3144 | unregister_blkdev(pktdev_major, DRIVER_NAME); | |
3145 | mempool_destroy(psd_pool); | |
3146 | } | |
3147 | ||
3148 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); | |
3149 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); | |
3150 | MODULE_LICENSE("GPL"); | |
3151 | ||
3152 | module_init(pkt_init); | |
3153 | module_exit(pkt_exit); |