blob: 29b7a648cc6ec639e973a881fb015910fa3992fe [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2000 Jens Axboe <axboe@suse.de>
3 * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com>
Thomas Maieradb92502006-12-08 02:36:10 -08004 * Copyright (C) 2006 Thomas Maier <balagi@justmail.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * May be copied or modified under the terms of the GNU General Public
7 * License. See linux/COPYING for more information.
8 *
Peter Osterlunda676f8d2005-09-13 01:25:27 -07009 * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and
10 * DVD-RAM devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 * Theory of operation:
13 *
Peter Osterlunda676f8d2005-09-13 01:25:27 -070014 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 *
Peter Osterlunda676f8d2005-09-13 01:25:27 -070023 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 *
45 *************************************************************************/
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/pktcdvd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#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>
Nigel Cunningham7dfb7102006-12-06 20:34:23 -080058#include <linux/freezer.h>
Jes Sorensen1657f822006-03-23 03:00:25 -080059#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#include <scsi/scsi_cmnd.h>
61#include <scsi/scsi_ioctl.h>
Peter Osterlundcef289632006-02-20 18:28:01 -080062#include <scsi/scsi.h>
Thomas Maier32694852006-12-08 02:36:12 -080063#include <linux/debugfs.h>
64#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66#include <asm/uaccess.h>
67
Thomas Maier78220822006-10-04 02:15:28 -070068#define DRIVER_NAME "pktcdvd"
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#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
86static struct pktcdvd_device *pkt_devs[MAX_WRITERS];
87static struct proc_dir_entry *pkt_proc;
Thomas Maieradd21662006-10-04 02:15:30 -070088static int pktdev_major;
Thomas Maier0a0fc962006-12-08 02:36:11 -080089static int write_congestion_on = PKT_WRITE_CONGESTION_ON;
90static int write_congestion_off = PKT_WRITE_CONGESTION_OFF;
Jes Sorensen1657f822006-03-23 03:00:25 -080091static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static mempool_t *psd_pool;
93
Thomas Maier32694852006-12-08 02:36:12 -080094static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */
95static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */
96
97/* forward declaration */
98static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev);
99static int pkt_remove_dev(dev_t pkt_dev);
100static int pkt_seq_show(struct seq_file *m, void *p);
101
102
103
104/*
105 * create and register a pktcdvd kernel object.
106 */
107static 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;
Greg Kroah-Hartman89c42602007-12-17 15:54:39 -0400113 int error;
114
Thomas Maier32694852006-12-08 02:36:12 -0800115 p = kzalloc(sizeof(*p), GFP_KERNEL);
116 if (!p)
117 return NULL;
Thomas Maier32694852006-12-08 02:36:12 -0800118 p->pd = pd;
Greg Kroah-Hartman89c42602007-12-17 15:54:39 -0400119 error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name);
120 if (error) {
Dave Youngd17a18d2007-12-17 16:20:00 -0800121 kobject_put(&p->kobj);
Thomas Maier32694852006-12-08 02:36:12 -0800122 return NULL;
Dave Youngd17a18d2007-12-17 16:20:00 -0800123 }
Greg Kroah-Hartman89c42602007-12-17 15:54:39 -0400124 kobject_uevent(&p->kobj, KOBJ_ADD);
Thomas Maier32694852006-12-08 02:36:12 -0800125 return p;
126}
127/*
128 * remove a pktcdvd kernel object.
129 */
130static void pkt_kobj_remove(struct pktcdvd_kobj *p)
131{
132 if (p)
Greg Kroah-Hartmanc10997f2007-12-20 08:13:05 -0800133 kobject_put(&p->kobj);
Thomas Maier32694852006-12-08 02:36:12 -0800134}
135/*
136 * default release function for pktcdvd kernel objects.
137 */
138static void pkt_kobj_release(struct kobject *kobj)
139{
140 kfree(to_pktcdvdkobj(kobj));
141}
142
143
144/**********************************************************
145 *
146 * sysfs interface for pktcdvd
147 * by (C) 2006 Thomas Maier <balagi@justmail.de>
148 *
149 **********************************************************/
150
151#define DEF_ATTR(_obj,_name,_mode) \
Tejun Heo7b595752007-06-14 03:45:17 +0900152 static struct attribute _obj = { .name = _name, .mode = _mode }
Thomas Maier32694852006-12-08 02:36:12 -0800153
154/**********************************************************
155 /sys/class/pktcdvd/pktcdvd[0-7]/
156 stat/reset
157 stat/packets_started
158 stat/packets_finished
159 stat/kb_written
160 stat/kb_read
161 stat/kb_read_gather
162 write_queue/size
163 write_queue/congestion_off
164 write_queue/congestion_on
165 **********************************************************/
166
167DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200);
168DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444);
169DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444);
170DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444);
171DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444);
172DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444);
173
174static struct attribute *kobj_pkt_attrs_stat[] = {
175 &kobj_pkt_attr_st1,
176 &kobj_pkt_attr_st2,
177 &kobj_pkt_attr_st3,
178 &kobj_pkt_attr_st4,
179 &kobj_pkt_attr_st5,
180 &kobj_pkt_attr_st6,
181 NULL
182};
183
184DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444);
185DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644);
186DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644);
187
188static struct attribute *kobj_pkt_attrs_wqueue[] = {
189 &kobj_pkt_attr_wq1,
190 &kobj_pkt_attr_wq2,
191 &kobj_pkt_attr_wq3,
192 NULL
193};
194
Thomas Maier32694852006-12-08 02:36:12 -0800195static ssize_t kobj_pkt_show(struct kobject *kobj,
196 struct attribute *attr, char *data)
197{
198 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
199 int n = 0;
200 int v;
201 if (strcmp(attr->name, "packets_started") == 0) {
202 n = sprintf(data, "%lu\n", pd->stats.pkt_started);
203
204 } else if (strcmp(attr->name, "packets_finished") == 0) {
205 n = sprintf(data, "%lu\n", pd->stats.pkt_ended);
206
207 } else if (strcmp(attr->name, "kb_written") == 0) {
208 n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1);
209
210 } else if (strcmp(attr->name, "kb_read") == 0) {
211 n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1);
212
213 } else if (strcmp(attr->name, "kb_read_gather") == 0) {
214 n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1);
215
216 } else if (strcmp(attr->name, "size") == 0) {
217 spin_lock(&pd->lock);
218 v = pd->bio_queue_size;
219 spin_unlock(&pd->lock);
220 n = sprintf(data, "%d\n", v);
221
222 } else if (strcmp(attr->name, "congestion_off") == 0) {
223 spin_lock(&pd->lock);
224 v = pd->write_congestion_off;
225 spin_unlock(&pd->lock);
226 n = sprintf(data, "%d\n", v);
227
228 } else if (strcmp(attr->name, "congestion_on") == 0) {
229 spin_lock(&pd->lock);
230 v = pd->write_congestion_on;
231 spin_unlock(&pd->lock);
232 n = sprintf(data, "%d\n", v);
233 }
234 return n;
235}
236
237static void init_write_congestion_marks(int* lo, int* hi)
238{
239 if (*hi > 0) {
240 *hi = max(*hi, 500);
241 *hi = min(*hi, 1000000);
242 if (*lo <= 0)
243 *lo = *hi - 100;
244 else {
245 *lo = min(*lo, *hi - 100);
246 *lo = max(*lo, 100);
247 }
248 } else {
249 *hi = -1;
250 *lo = -1;
251 }
252}
253
254static ssize_t kobj_pkt_store(struct kobject *kobj,
255 struct attribute *attr,
256 const char *data, size_t len)
257{
258 struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd;
259 int val;
Thomas Maier32694852006-12-08 02:36:12 -0800260
Thomas Maier83f3aa32007-02-10 01:45:11 -0800261 if (strcmp(attr->name, "reset") == 0 && len > 0) {
Thomas Maier32694852006-12-08 02:36:12 -0800262 pd->stats.pkt_started = 0;
263 pd->stats.pkt_ended = 0;
264 pd->stats.secs_w = 0;
265 pd->stats.secs_rg = 0;
266 pd->stats.secs_r = 0;
267
268 } else if (strcmp(attr->name, "congestion_off") == 0
Thomas Maier83f3aa32007-02-10 01:45:11 -0800269 && sscanf(data, "%d", &val) == 1) {
Thomas Maier32694852006-12-08 02:36:12 -0800270 spin_lock(&pd->lock);
271 pd->write_congestion_off = val;
272 init_write_congestion_marks(&pd->write_congestion_off,
273 &pd->write_congestion_on);
274 spin_unlock(&pd->lock);
275
276 } else if (strcmp(attr->name, "congestion_on") == 0
Thomas Maier83f3aa32007-02-10 01:45:11 -0800277 && sscanf(data, "%d", &val) == 1) {
Thomas Maier32694852006-12-08 02:36:12 -0800278 spin_lock(&pd->lock);
279 pd->write_congestion_on = val;
280 init_write_congestion_marks(&pd->write_congestion_off,
281 &pd->write_congestion_on);
282 spin_unlock(&pd->lock);
283 }
284 return len;
285}
286
287static struct sysfs_ops kobj_pkt_ops = {
288 .show = kobj_pkt_show,
289 .store = kobj_pkt_store
290};
291static struct kobj_type kobj_pkt_type_stat = {
292 .release = pkt_kobj_release,
293 .sysfs_ops = &kobj_pkt_ops,
294 .default_attrs = kobj_pkt_attrs_stat
295};
296static struct kobj_type kobj_pkt_type_wqueue = {
297 .release = pkt_kobj_release,
298 .sysfs_ops = &kobj_pkt_ops,
299 .default_attrs = kobj_pkt_attrs_wqueue
300};
301
302static void pkt_sysfs_dev_new(struct pktcdvd_device *pd)
303{
304 if (class_pktcdvd) {
Greg Kroah-Hartmanf79f0602008-05-21 12:52:33 -0700305 pd->dev = device_create_drvdata(class_pktcdvd, NULL,
306 pd->pkt_dev, NULL,
307 "%s", pd->name);
Tony Jones6013c122007-09-25 02:03:03 +0200308 if (IS_ERR(pd->dev))
309 pd->dev = NULL;
Thomas Maier32694852006-12-08 02:36:12 -0800310 }
Tony Jones6013c122007-09-25 02:03:03 +0200311 if (pd->dev) {
Thomas Maier32694852006-12-08 02:36:12 -0800312 pd->kobj_stat = pkt_kobj_create(pd, "stat",
Tony Jones6013c122007-09-25 02:03:03 +0200313 &pd->dev->kobj,
Thomas Maier32694852006-12-08 02:36:12 -0800314 &kobj_pkt_type_stat);
315 pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue",
Tony Jones6013c122007-09-25 02:03:03 +0200316 &pd->dev->kobj,
Thomas Maier32694852006-12-08 02:36:12 -0800317 &kobj_pkt_type_wqueue);
318 }
319}
320
321static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd)
322{
323 pkt_kobj_remove(pd->kobj_stat);
324 pkt_kobj_remove(pd->kobj_wqueue);
325 if (class_pktcdvd)
Tony Jones6013c122007-09-25 02:03:03 +0200326 device_destroy(class_pktcdvd, pd->pkt_dev);
Thomas Maier32694852006-12-08 02:36:12 -0800327}
328
329
330/********************************************************************
331 /sys/class/pktcdvd/
332 add map block device
333 remove unmap packet dev
334 device_map show mappings
335 *******************************************************************/
336
337static void class_pktcdvd_release(struct class *cls)
338{
339 kfree(cls);
340}
341static ssize_t class_pktcdvd_show_map(struct class *c, char *data)
342{
343 int n = 0;
344 int idx;
345 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
346 for (idx = 0; idx < MAX_WRITERS; idx++) {
347 struct pktcdvd_device *pd = pkt_devs[idx];
348 if (!pd)
349 continue;
350 n += sprintf(data+n, "%s %u:%u %u:%u\n",
351 pd->name,
352 MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
353 MAJOR(pd->bdev->bd_dev),
354 MINOR(pd->bdev->bd_dev));
355 }
356 mutex_unlock(&ctl_mutex);
357 return n;
358}
359
360static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf,
361 size_t count)
362{
363 unsigned int major, minor;
Tejun Heofffe4872007-11-08 08:00:24 +0100364
Thomas Maier83f3aa32007-02-10 01:45:11 -0800365 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
Tejun Heofffe4872007-11-08 08:00:24 +0100366 /* pkt_setup_dev() expects caller to hold reference to self */
367 if (!try_module_get(THIS_MODULE))
368 return -ENODEV;
369
Thomas Maier32694852006-12-08 02:36:12 -0800370 pkt_setup_dev(MKDEV(major, minor), NULL);
Tejun Heofffe4872007-11-08 08:00:24 +0100371
372 module_put(THIS_MODULE);
373
Thomas Maier32694852006-12-08 02:36:12 -0800374 return count;
375 }
Tejun Heofffe4872007-11-08 08:00:24 +0100376
Thomas Maier32694852006-12-08 02:36:12 -0800377 return -EINVAL;
378}
379
380static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf,
381 size_t count)
382{
383 unsigned int major, minor;
Thomas Maier83f3aa32007-02-10 01:45:11 -0800384 if (sscanf(buf, "%u:%u", &major, &minor) == 2) {
Thomas Maier32694852006-12-08 02:36:12 -0800385 pkt_remove_dev(MKDEV(major, minor));
386 return count;
387 }
388 return -EINVAL;
389}
390
391static struct class_attribute class_pktcdvd_attrs[] = {
392 __ATTR(add, 0200, NULL, class_pktcdvd_store_add),
393 __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove),
394 __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL),
395 __ATTR_NULL
396};
397
398
399static int pkt_sysfs_init(void)
400{
401 int ret = 0;
402
403 /*
404 * create control files in sysfs
405 * /sys/class/pktcdvd/...
406 */
407 class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL);
408 if (!class_pktcdvd)
409 return -ENOMEM;
410 class_pktcdvd->name = DRIVER_NAME;
411 class_pktcdvd->owner = THIS_MODULE;
412 class_pktcdvd->class_release = class_pktcdvd_release;
413 class_pktcdvd->class_attrs = class_pktcdvd_attrs;
414 ret = class_register(class_pktcdvd);
415 if (ret) {
416 kfree(class_pktcdvd);
417 class_pktcdvd = NULL;
418 printk(DRIVER_NAME": failed to create class pktcdvd\n");
419 return ret;
420 }
421 return 0;
422}
423
424static void pkt_sysfs_cleanup(void)
425{
426 if (class_pktcdvd)
427 class_destroy(class_pktcdvd);
428 class_pktcdvd = NULL;
429}
430
431/********************************************************************
432 entries in debugfs
433
434 /debugfs/pktcdvd[0-7]/
435 info
436
437 *******************************************************************/
438
439static int pkt_debugfs_seq_show(struct seq_file *m, void *p)
440{
441 return pkt_seq_show(m, p);
442}
443
444static int pkt_debugfs_fops_open(struct inode *inode, struct file *file)
445{
446 return single_open(file, pkt_debugfs_seq_show, inode->i_private);
447}
448
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800449static const struct file_operations debug_fops = {
Thomas Maier32694852006-12-08 02:36:12 -0800450 .open = pkt_debugfs_fops_open,
451 .read = seq_read,
452 .llseek = seq_lseek,
453 .release = single_release,
454 .owner = THIS_MODULE,
455};
456
457static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
458{
459 if (!pkt_debugfs_root)
460 return;
461 pd->dfs_f_info = NULL;
462 pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root);
463 if (IS_ERR(pd->dfs_d_root)) {
464 pd->dfs_d_root = NULL;
465 return;
466 }
467 pd->dfs_f_info = debugfs_create_file("info", S_IRUGO,
468 pd->dfs_d_root, pd, &debug_fops);
469 if (IS_ERR(pd->dfs_f_info)) {
470 pd->dfs_f_info = NULL;
471 return;
472 }
473}
474
475static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd)
476{
477 if (!pkt_debugfs_root)
478 return;
479 if (pd->dfs_f_info)
480 debugfs_remove(pd->dfs_f_info);
481 pd->dfs_f_info = NULL;
482 if (pd->dfs_d_root)
483 debugfs_remove(pd->dfs_d_root);
484 pd->dfs_d_root = NULL;
485}
486
487static void pkt_debugfs_init(void)
488{
489 pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL);
490 if (IS_ERR(pkt_debugfs_root)) {
491 pkt_debugfs_root = NULL;
492 return;
493 }
494}
495
496static void pkt_debugfs_cleanup(void)
497{
498 if (!pkt_debugfs_root)
499 return;
500 debugfs_remove(pkt_debugfs_root);
501 pkt_debugfs_root = NULL;
502}
503
504/* ----------------------------------------------------------*/
505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507static void pkt_bio_finished(struct pktcdvd_device *pd)
508{
509 BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0);
510 if (atomic_dec_and_test(&pd->cdrw.pending_bios)) {
Thomas Maier78220822006-10-04 02:15:28 -0700511 VPRINTK(DRIVER_NAME": queue empty\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 atomic_set(&pd->iosched.attention, 1);
513 wake_up(&pd->wqueue);
514 }
515}
516
517static void pkt_bio_destructor(struct bio *bio)
518{
519 kfree(bio->bi_io_vec);
520 kfree(bio);
521}
522
523static struct bio *pkt_bio_alloc(int nr_iovecs)
524{
525 struct bio_vec *bvl = NULL;
526 struct bio *bio;
527
528 bio = kmalloc(sizeof(struct bio), GFP_KERNEL);
529 if (!bio)
530 goto no_bio;
531 bio_init(bio);
532
Peter Osterlund1107d2e2005-09-13 01:25:29 -0700533 bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 if (!bvl)
535 goto no_bvl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537 bio->bi_max_vecs = nr_iovecs;
538 bio->bi_io_vec = bvl;
539 bio->bi_destructor = pkt_bio_destructor;
540
541 return bio;
542
543 no_bvl:
544 kfree(bio);
545 no_bio:
546 return NULL;
547}
548
549/*
550 * Allocate a packet_data struct
551 */
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800552static struct packet_data *pkt_alloc_packet_data(int frames)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553{
554 int i;
555 struct packet_data *pkt;
556
Peter Osterlund1107d2e2005-09-13 01:25:29 -0700557 pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 if (!pkt)
559 goto no_pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800561 pkt->frames = frames;
562 pkt->w_bio = pkt_bio_alloc(frames);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 if (!pkt->w_bio)
564 goto no_bio;
565
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800566 for (i = 0; i < frames / FRAMES_PER_PAGE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
568 if (!pkt->pages[i])
569 goto no_page;
570 }
571
572 spin_lock_init(&pkt->lock);
573
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800574 for (i = 0; i < frames; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 struct bio *bio = pkt_bio_alloc(1);
576 if (!bio)
577 goto no_rd_bio;
578 pkt->r_bios[i] = bio;
579 }
580
581 return pkt;
582
583no_rd_bio:
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800584 for (i = 0; i < frames; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 struct bio *bio = pkt->r_bios[i];
586 if (bio)
587 bio_put(bio);
588 }
589
590no_page:
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800591 for (i = 0; i < frames / FRAMES_PER_PAGE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if (pkt->pages[i])
593 __free_page(pkt->pages[i]);
594 bio_put(pkt->w_bio);
595no_bio:
596 kfree(pkt);
597no_pkt:
598 return NULL;
599}
600
601/*
602 * Free a packet_data struct
603 */
604static void pkt_free_packet_data(struct packet_data *pkt)
605{
606 int i;
607
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800608 for (i = 0; i < pkt->frames; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 struct bio *bio = pkt->r_bios[i];
610 if (bio)
611 bio_put(bio);
612 }
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800613 for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 __free_page(pkt->pages[i]);
615 bio_put(pkt->w_bio);
616 kfree(pkt);
617}
618
619static void pkt_shrink_pktlist(struct pktcdvd_device *pd)
620{
621 struct packet_data *pkt, *next;
622
623 BUG_ON(!list_empty(&pd->cdrw.pkt_active_list));
624
625 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) {
626 pkt_free_packet_data(pkt);
627 }
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800628 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629}
630
631static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets)
632{
633 struct packet_data *pkt;
634
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800635 BUG_ON(!list_empty(&pd->cdrw.pkt_free_list));
636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 while (nr_packets > 0) {
Peter Osterlunde1bc89b2006-02-04 23:27:47 -0800638 pkt = pkt_alloc_packet_data(pd->settings.size >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 if (!pkt) {
640 pkt_shrink_pktlist(pd);
641 return 0;
642 }
643 pkt->id = nr_packets;
644 pkt->pd = pd;
645 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
646 nr_packets--;
647 }
648 return 1;
649}
650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node)
652{
653 struct rb_node *n = rb_next(&node->rb_node);
654 if (!n)
655 return NULL;
656 return rb_entry(n, struct pkt_rb_node, rb_node);
657}
658
Peter Osterlundac893962006-01-14 13:21:32 -0800659static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660{
661 rb_erase(&node->rb_node, &pd->bio_queue);
662 mempool_free(node, pd->rb_pool);
663 pd->bio_queue_size--;
664 BUG_ON(pd->bio_queue_size < 0);
665}
666
667/*
668 * Find the first node in the pd->bio_queue rb tree with a starting sector >= s.
669 */
670static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s)
671{
672 struct rb_node *n = pd->bio_queue.rb_node;
673 struct rb_node *next;
674 struct pkt_rb_node *tmp;
675
676 if (!n) {
677 BUG_ON(pd->bio_queue_size > 0);
678 return NULL;
679 }
680
681 for (;;) {
682 tmp = rb_entry(n, struct pkt_rb_node, rb_node);
683 if (s <= tmp->bio->bi_sector)
684 next = n->rb_left;
685 else
686 next = n->rb_right;
687 if (!next)
688 break;
689 n = next;
690 }
691
692 if (s > tmp->bio->bi_sector) {
693 tmp = pkt_rbtree_next(tmp);
694 if (!tmp)
695 return NULL;
696 }
697 BUG_ON(s > tmp->bio->bi_sector);
698 return tmp;
699}
700
701/*
702 * Insert a node into the pd->bio_queue rb tree.
703 */
704static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node)
705{
706 struct rb_node **p = &pd->bio_queue.rb_node;
707 struct rb_node *parent = NULL;
708 sector_t s = node->bio->bi_sector;
709 struct pkt_rb_node *tmp;
710
711 while (*p) {
712 parent = *p;
713 tmp = rb_entry(parent, struct pkt_rb_node, rb_node);
714 if (s < tmp->bio->bi_sector)
715 p = &(*p)->rb_left;
716 else
717 p = &(*p)->rb_right;
718 }
719 rb_link_node(&node->rb_node, parent, p);
720 rb_insert_color(&node->rb_node, &pd->bio_queue);
721 pd->bio_queue_size++;
722}
723
724/*
725 * Add a bio to a single linked list defined by its head and tail pointers.
726 */
Peter Osterlundac893962006-01-14 13:21:32 -0800727static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
729 bio->bi_next = NULL;
730 if (*list_tail) {
731 BUG_ON((*list_head) == NULL);
732 (*list_tail)->bi_next = bio;
733 (*list_tail) = bio;
734 } else {
735 BUG_ON((*list_head) != NULL);
736 (*list_head) = bio;
737 (*list_tail) = bio;
738 }
739}
740
741/*
742 * Remove and return the first bio from a single linked list defined by its
743 * head and tail pointers.
744 */
745static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail)
746{
747 struct bio *bio;
748
749 if (*list_head == NULL)
750 return NULL;
751
752 bio = *list_head;
753 *list_head = bio->bi_next;
754 if (*list_head == NULL)
755 *list_tail = NULL;
756
757 bio->bi_next = NULL;
758 return bio;
759}
760
761/*
762 * Send a packet_command to the underlying block device and
763 * wait for completion.
764 */
765static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
766{
Jens Axboe165125e2007-07-24 09:28:11 +0200767 struct request_queue *q = bdev_get_queue(pd->bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 struct request *rq;
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800769 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800771 rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ?
772 WRITE : READ, __GFP_WAIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800774 if (cgc->buflen) {
775 if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT))
776 goto out;
777 }
778
Gerhard Dirschl91e4ee32007-02-20 13:57:56 -0800779 rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]);
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800780 memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE);
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 rq->timeout = 60*HZ;
Jens Axboe4aff5e22006-08-10 08:44:47 +0200783 rq->cmd_type = REQ_TYPE_BLOCK_PC;
784 rq->cmd_flags |= REQ_HARDBARRIER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 if (cgc->quiet)
Jens Axboe4aff5e22006-08-10 08:44:47 +0200786 rq->cmd_flags |= REQ_QUIET;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800788 blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0);
Andrew Mortoncbc31a42007-04-25 13:01:21 -0700789 if (rq->errors)
790 ret = -EIO;
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800791out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 blk_put_request(rq);
Christoph Hellwig406c9b62007-01-05 16:36:26 -0800793 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794}
795
796/*
797 * A generic sense dump / resolve mechanism should be implemented across
798 * all ATAPI + SCSI devices.
799 */
800static void pkt_dump_sense(struct packet_command *cgc)
801{
802 static char *info[9] = { "No sense", "Recovered error", "Not ready",
803 "Medium error", "Hardware error", "Illegal request",
804 "Unit attention", "Data protect", "Blank check" };
805 int i;
806 struct request_sense *sense = cgc->sense;
807
Thomas Maier78220822006-10-04 02:15:28 -0700808 printk(DRIVER_NAME":");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 for (i = 0; i < CDROM_PACKET_SIZE; i++)
810 printk(" %02x", cgc->cmd[i]);
811 printk(" - ");
812
813 if (sense == NULL) {
814 printk("no sense\n");
815 return;
816 }
817
818 printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq);
819
820 if (sense->sense_key > 8) {
821 printk(" (INVALID)\n");
822 return;
823 }
824
825 printk(" (%s)\n", info[sense->sense_key]);
826}
827
828/*
829 * flush the drive cache to media
830 */
831static int pkt_flush_cache(struct pktcdvd_device *pd)
832{
833 struct packet_command cgc;
834
835 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
836 cgc.cmd[0] = GPCMD_FLUSH_CACHE;
837 cgc.quiet = 1;
838
839 /*
840 * the IMMED bit -- we default to not setting it, although that
841 * would allow a much faster close, this is safer
842 */
843#if 0
844 cgc.cmd[1] = 1 << 1;
845#endif
846 return pkt_generic_packet(pd, &cgc);
847}
848
849/*
850 * speed is given as the normal factor, e.g. 4 for 4x
851 */
Peter Osterlund05680d82008-03-04 14:28:41 -0800852static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd,
853 unsigned write_speed, unsigned read_speed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854{
855 struct packet_command cgc;
856 struct request_sense sense;
857 int ret;
858
859 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
860 cgc.sense = &sense;
861 cgc.cmd[0] = GPCMD_SET_SPEED;
862 cgc.cmd[2] = (read_speed >> 8) & 0xff;
863 cgc.cmd[3] = read_speed & 0xff;
864 cgc.cmd[4] = (write_speed >> 8) & 0xff;
865 cgc.cmd[5] = write_speed & 0xff;
866
867 if ((ret = pkt_generic_packet(pd, &cgc)))
868 pkt_dump_sense(&cgc);
869
870 return ret;
871}
872
873/*
874 * Queue a bio for processing by the low-level CD device. Must be called
875 * from process context.
876 */
Peter Osterlund46c271b2005-06-23 00:10:02 -0700877static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878{
879 spin_lock(&pd->iosched.lock);
880 if (bio_data_dir(bio) == READ) {
881 pkt_add_list_last(bio, &pd->iosched.read_queue,
882 &pd->iosched.read_queue_tail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 } else {
884 pkt_add_list_last(bio, &pd->iosched.write_queue,
885 &pd->iosched.write_queue_tail);
886 }
887 spin_unlock(&pd->iosched.lock);
888
889 atomic_set(&pd->iosched.attention, 1);
890 wake_up(&pd->wqueue);
891}
892
893/*
894 * Process the queued read/write requests. This function handles special
895 * requirements for CDRW drives:
896 * - A cache flush command must be inserted before a read request if the
897 * previous request was a write.
Peter Osterlund46c271b2005-06-23 00:10:02 -0700898 * - Switching between reading and writing is slow, so don't do it more often
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 * than necessary.
Peter Osterlund46c271b2005-06-23 00:10:02 -0700900 * - Optimize for throughput at the expense of latency. This means that streaming
901 * writes will never be interrupted by a read, but if the drive has to seek
902 * before the next write, switch to reading instead if there are any pending
903 * read requests.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 * - Set the read speed according to current usage pattern. When only reading
905 * from the device, it's best to use the highest possible read speed, but
906 * when switching often between reading and writing, it's better to have the
907 * same read and write speeds.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 */
909static void pkt_iosched_process_queue(struct pktcdvd_device *pd)
910{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
912 if (atomic_read(&pd->iosched.attention) == 0)
913 return;
914 atomic_set(&pd->iosched.attention, 0);
915
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 for (;;) {
917 struct bio *bio;
Peter Osterlund46c271b2005-06-23 00:10:02 -0700918 int reads_queued, writes_queued;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
920 spin_lock(&pd->iosched.lock);
921 reads_queued = (pd->iosched.read_queue != NULL);
922 writes_queued = (pd->iosched.write_queue != NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 spin_unlock(&pd->iosched.lock);
924
925 if (!reads_queued && !writes_queued)
926 break;
927
928 if (pd->iosched.writing) {
Peter Osterlund46c271b2005-06-23 00:10:02 -0700929 int need_write_seek = 1;
930 spin_lock(&pd->iosched.lock);
931 bio = pd->iosched.write_queue;
932 spin_unlock(&pd->iosched.lock);
933 if (bio && (bio->bi_sector == pd->iosched.last_write))
934 need_write_seek = 0;
935 if (need_write_seek && reads_queued) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
Thomas Maier78220822006-10-04 02:15:28 -0700937 VPRINTK(DRIVER_NAME": write, waiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 break;
939 }
940 pkt_flush_cache(pd);
941 pd->iosched.writing = 0;
942 }
943 } else {
944 if (!reads_queued && writes_queued) {
945 if (atomic_read(&pd->cdrw.pending_bios) > 0) {
Thomas Maier78220822006-10-04 02:15:28 -0700946 VPRINTK(DRIVER_NAME": read, waiting\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 break;
948 }
949 pd->iosched.writing = 1;
950 }
951 }
952
953 spin_lock(&pd->iosched.lock);
954 if (pd->iosched.writing) {
955 bio = pkt_get_list_first(&pd->iosched.write_queue,
956 &pd->iosched.write_queue_tail);
957 } else {
958 bio = pkt_get_list_first(&pd->iosched.read_queue,
959 &pd->iosched.read_queue_tail);
960 }
961 spin_unlock(&pd->iosched.lock);
962
963 if (!bio)
964 continue;
965
966 if (bio_data_dir(bio) == READ)
967 pd->iosched.successive_reads += bio->bi_size >> 10;
Peter Osterlund46c271b2005-06-23 00:10:02 -0700968 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 pd->iosched.successive_reads = 0;
Peter Osterlund46c271b2005-06-23 00:10:02 -0700970 pd->iosched.last_write = bio->bi_sector + bio_sectors(bio);
971 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) {
973 if (pd->read_speed == pd->write_speed) {
974 pd->read_speed = MAX_SPEED;
975 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
976 }
977 } else {
978 if (pd->read_speed != pd->write_speed) {
979 pd->read_speed = pd->write_speed;
980 pkt_set_speed(pd, pd->write_speed, pd->read_speed);
981 }
982 }
983
984 atomic_inc(&pd->cdrw.pending_bios);
985 generic_make_request(bio);
986 }
987}
988
989/*
990 * Special care is needed if the underlying block device has a small
991 * max_phys_segments value.
992 */
Jens Axboe165125e2007-07-24 09:28:11 +0200993static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994{
995 if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) {
996 /*
997 * The cdrom device can handle one segment/frame
998 */
999 clear_bit(PACKET_MERGE_SEGS, &pd->flags);
1000 return 0;
1001 } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) {
1002 /*
1003 * We can handle this case at the expense of some extra memory
1004 * copies during write operations
1005 */
1006 set_bit(PACKET_MERGE_SEGS, &pd->flags);
1007 return 0;
1008 } else {
Thomas Maier78220822006-10-04 02:15:28 -07001009 printk(DRIVER_NAME": cdrom max_phys_segments too small\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 return -EIO;
1011 }
1012}
1013
1014/*
1015 * Copy CD_FRAMESIZE bytes from src_bio into a destination page
1016 */
1017static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs)
1018{
1019 unsigned int copy_size = CD_FRAMESIZE;
1020
1021 while (copy_size > 0) {
1022 struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg);
1023 void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) +
1024 src_bvl->bv_offset + offs;
1025 void *vto = page_address(dst_page) + dst_offs;
1026 int len = min_t(int, copy_size, src_bvl->bv_len - offs);
1027
1028 BUG_ON(len < 0);
1029 memcpy(vto, vfrom, len);
1030 kunmap_atomic(vfrom, KM_USER0);
1031
1032 seg++;
1033 offs = 0;
1034 dst_offs += len;
1035 copy_size -= len;
1036 }
1037}
1038
1039/*
1040 * Copy all data for this packet to pkt->pages[], so that
1041 * a) The number of required segments for the write bio is minimized, which
1042 * is necessary for some scsi controllers.
1043 * b) The data can be used as cache to avoid read requests if we receive a
1044 * new write request for the same zone.
1045 */
Peter Osterlund72772322006-02-14 13:52:56 -08001046static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047{
1048 int f, p, offs;
1049
1050 /* Copy all data to pkt->pages[] */
1051 p = 0;
1052 offs = 0;
1053 for (f = 0; f < pkt->frames; f++) {
Peter Osterlund72772322006-02-14 13:52:56 -08001054 if (bvec[f].bv_page != pkt->pages[p]) {
1055 void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 void *vto = page_address(pkt->pages[p]) + offs;
1057 memcpy(vto, vfrom, CD_FRAMESIZE);
1058 kunmap_atomic(vfrom, KM_USER0);
Peter Osterlund72772322006-02-14 13:52:56 -08001059 bvec[f].bv_page = pkt->pages[p];
1060 bvec[f].bv_offset = offs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 } else {
Peter Osterlund72772322006-02-14 13:52:56 -08001062 BUG_ON(bvec[f].bv_offset != offs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 }
1064 offs += CD_FRAMESIZE;
1065 if (offs >= PAGE_SIZE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 offs = 0;
1067 p++;
1068 }
1069 }
1070}
1071
NeilBrown6712ecf2007-09-27 12:47:43 +02001072static void pkt_end_io_read(struct bio *bio, int err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073{
1074 struct packet_data *pkt = bio->bi_private;
1075 struct pktcdvd_device *pd = pkt->pd;
1076 BUG_ON(!pd);
1077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio,
1079 (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err);
1080
1081 if (err)
1082 atomic_inc(&pkt->io_errors);
1083 if (atomic_dec_and_test(&pkt->io_wait)) {
1084 atomic_inc(&pkt->run_sm);
1085 wake_up(&pd->wqueue);
1086 }
1087 pkt_bio_finished(pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088}
1089
NeilBrown6712ecf2007-09-27 12:47:43 +02001090static void pkt_end_io_packet_write(struct bio *bio, int err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091{
1092 struct packet_data *pkt = bio->bi_private;
1093 struct pktcdvd_device *pd = pkt->pd;
1094 BUG_ON(!pd);
1095
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err);
1097
1098 pd->stats.pkt_ended++;
1099
1100 pkt_bio_finished(pd);
1101 atomic_dec(&pkt->io_wait);
1102 atomic_inc(&pkt->run_sm);
1103 wake_up(&pd->wqueue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104}
1105
1106/*
1107 * Schedule reads for the holes in a packet
1108 */
1109static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1110{
1111 int frames_read = 0;
1112 struct bio *bio;
1113 int f;
1114 char written[PACKET_MAX_SIZE];
1115
1116 BUG_ON(!pkt->orig_bios);
1117
1118 atomic_set(&pkt->io_wait, 0);
1119 atomic_set(&pkt->io_errors, 0);
1120
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 /*
1122 * Figure out which frames we need to read before we can write.
1123 */
1124 memset(written, 0, sizeof(written));
1125 spin_lock(&pkt->lock);
1126 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1127 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1128 int num_frames = bio->bi_size / CD_FRAMESIZE;
Peter Osterlund06e7ab52005-09-13 01:25:28 -07001129 pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 BUG_ON(first_frame < 0);
1131 BUG_ON(first_frame + num_frames > pkt->frames);
1132 for (f = first_frame; f < first_frame + num_frames; f++)
1133 written[f] = 1;
1134 }
1135 spin_unlock(&pkt->lock);
1136
Peter Osterlund06e7ab52005-09-13 01:25:28 -07001137 if (pkt->cache_valid) {
1138 VPRINTK("pkt_gather_data: zone %llx cached\n",
1139 (unsigned long long)pkt->sector);
1140 goto out_account;
1141 }
1142
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 /*
1144 * Schedule reads for missing parts of the packet.
1145 */
1146 for (f = 0; f < pkt->frames; f++) {
Jens Axboe761a15e2007-09-14 13:06:53 +02001147 struct bio_vec *vec;
1148
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 int p, offset;
1150 if (written[f])
1151 continue;
1152 bio = pkt->r_bios[f];
Jens Axboe761a15e2007-09-14 13:06:53 +02001153 vec = bio->bi_io_vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 bio_init(bio);
1155 bio->bi_max_vecs = 1;
1156 bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
1157 bio->bi_bdev = pd->bdev;
1158 bio->bi_end_io = pkt_end_io_read;
1159 bio->bi_private = pkt;
Jens Axboe761a15e2007-09-14 13:06:53 +02001160 bio->bi_io_vec = vec;
Laurent Riffard7e3da6c2007-09-21 08:32:28 +02001161 bio->bi_destructor = pkt_bio_destructor;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 p = (f * CD_FRAMESIZE) / PAGE_SIZE;
1164 offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
1165 VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n",
1166 f, pkt->pages[p], offset);
1167 if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset))
1168 BUG();
1169
1170 atomic_inc(&pkt->io_wait);
1171 bio->bi_rw = READ;
Peter Osterlund46c271b2005-06-23 00:10:02 -07001172 pkt_queue_bio(pd, bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 frames_read++;
1174 }
1175
1176out_account:
1177 VPRINTK("pkt_gather_data: need %d frames for zone %llx\n",
1178 frames_read, (unsigned long long)pkt->sector);
1179 pd->stats.pkt_started++;
1180 pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181}
1182
1183/*
1184 * Find a packet matching zone, or the least recently used packet if
1185 * there is no match.
1186 */
1187static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone)
1188{
1189 struct packet_data *pkt;
1190
1191 list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) {
1192 if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) {
1193 list_del_init(&pkt->list);
1194 if (pkt->sector != zone)
1195 pkt->cache_valid = 0;
Peter Osterlund610827d2005-09-13 01:25:29 -07001196 return pkt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 }
1198 }
Peter Osterlund610827d2005-09-13 01:25:29 -07001199 BUG();
1200 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201}
1202
1203static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt)
1204{
1205 if (pkt->cache_valid) {
1206 list_add(&pkt->list, &pd->cdrw.pkt_free_list);
1207 } else {
1208 list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list);
1209 }
1210}
1211
1212/*
1213 * recover a failed write, query for relocation if possible
1214 *
1215 * returns 1 if recovery is possible, or 0 if not
1216 *
1217 */
1218static int pkt_start_recovery(struct packet_data *pkt)
1219{
1220 /*
1221 * FIXME. We need help from the file system to implement
1222 * recovery handling.
1223 */
1224 return 0;
1225#if 0
1226 struct request *rq = pkt->rq;
1227 struct pktcdvd_device *pd = rq->rq_disk->private_data;
1228 struct block_device *pkt_bdev;
1229 struct super_block *sb = NULL;
1230 unsigned long old_block, new_block;
1231 sector_t new_sector;
1232
1233 pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev));
1234 if (pkt_bdev) {
1235 sb = get_super(pkt_bdev);
1236 bdput(pkt_bdev);
1237 }
1238
1239 if (!sb)
1240 return 0;
1241
1242 if (!sb->s_op || !sb->s_op->relocate_blocks)
1243 goto out;
1244
1245 old_block = pkt->sector / (CD_FRAMESIZE >> 9);
1246 if (sb->s_op->relocate_blocks(sb, old_block, &new_block))
1247 goto out;
1248
1249 new_sector = new_block * (CD_FRAMESIZE >> 9);
1250 pkt->sector = new_sector;
1251
1252 pkt->bio->bi_sector = new_sector;
1253 pkt->bio->bi_next = NULL;
1254 pkt->bio->bi_flags = 1 << BIO_UPTODATE;
1255 pkt->bio->bi_idx = 0;
1256
1257 BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW));
1258 BUG_ON(pkt->bio->bi_vcnt != pkt->frames);
1259 BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE);
1260 BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write);
1261 BUG_ON(pkt->bio->bi_private != pkt);
1262
1263 drop_super(sb);
1264 return 1;
1265
1266out:
1267 drop_super(sb);
1268 return 0;
1269#endif
1270}
1271
1272static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state)
1273{
1274#if PACKET_DEBUG > 1
1275 static const char *state_name[] = {
1276 "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED"
1277 };
1278 enum packet_data_state old_state = pkt->state;
1279 VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector,
1280 state_name[old_state], state_name[state]);
1281#endif
1282 pkt->state = state;
1283}
1284
1285/*
1286 * Scan the work queue to see if we can start a new packet.
1287 * returns non-zero if any work was done.
1288 */
1289static int pkt_handle_queue(struct pktcdvd_device *pd)
1290{
1291 struct packet_data *pkt, *p;
1292 struct bio *bio = NULL;
1293 sector_t zone = 0; /* Suppress gcc warning */
1294 struct pkt_rb_node *node, *first_node;
1295 struct rb_node *n;
Thomas Maier0a0fc962006-12-08 02:36:11 -08001296 int wakeup;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297
1298 VPRINTK("handle_queue\n");
1299
1300 atomic_set(&pd->scan_queue, 0);
1301
1302 if (list_empty(&pd->cdrw.pkt_free_list)) {
1303 VPRINTK("handle_queue: no pkt\n");
1304 return 0;
1305 }
1306
1307 /*
1308 * Try to find a zone we are not already working on.
1309 */
1310 spin_lock(&pd->lock);
1311 first_node = pkt_rbtree_find(pd, pd->current_sector);
1312 if (!first_node) {
1313 n = rb_first(&pd->bio_queue);
1314 if (n)
1315 first_node = rb_entry(n, struct pkt_rb_node, rb_node);
1316 }
1317 node = first_node;
1318 while (node) {
1319 bio = node->bio;
1320 zone = ZONE(bio->bi_sector, pd);
1321 list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) {
Peter Osterlund7baeb6a2005-05-16 21:53:42 -07001322 if (p->sector == zone) {
1323 bio = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 goto try_next_bio;
Peter Osterlund7baeb6a2005-05-16 21:53:42 -07001325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 }
1327 break;
1328try_next_bio:
1329 node = pkt_rbtree_next(node);
1330 if (!node) {
1331 n = rb_first(&pd->bio_queue);
1332 if (n)
1333 node = rb_entry(n, struct pkt_rb_node, rb_node);
1334 }
1335 if (node == first_node)
1336 node = NULL;
1337 }
1338 spin_unlock(&pd->lock);
1339 if (!bio) {
1340 VPRINTK("handle_queue: no bio\n");
1341 return 0;
1342 }
1343
1344 pkt = pkt_get_packet_data(pd, zone);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345
1346 pd->current_sector = zone + pd->settings.size;
1347 pkt->sector = zone;
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08001348 BUG_ON(pkt->frames != pd->settings.size >> 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 pkt->write_size = 0;
1350
1351 /*
1352 * Scan work queue for bios in the same zone and link them
1353 * to this packet.
1354 */
1355 spin_lock(&pd->lock);
1356 VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone);
1357 while ((node = pkt_rbtree_find(pd, zone)) != NULL) {
1358 bio = node->bio;
1359 VPRINTK("pkt_handle_queue: found zone=%llx\n",
1360 (unsigned long long)ZONE(bio->bi_sector, pd));
1361 if (ZONE(bio->bi_sector, pd) != zone)
1362 break;
1363 pkt_rbtree_erase(pd, node);
1364 spin_lock(&pkt->lock);
1365 pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail);
1366 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
1367 spin_unlock(&pkt->lock);
1368 }
Thomas Maier0a0fc962006-12-08 02:36:11 -08001369 /* check write congestion marks, and if bio_queue_size is
1370 below, wake up any waiters */
1371 wakeup = (pd->write_congestion_on > 0
1372 && pd->bio_queue_size <= pd->write_congestion_off);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 spin_unlock(&pd->lock);
Thomas Maier0a0fc962006-12-08 02:36:11 -08001374 if (wakeup)
Thomas Maier83f3aa32007-02-10 01:45:11 -08001375 clear_bdi_congested(&pd->disk->queue->backing_dev_info, WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376
1377 pkt->sleep_time = max(PACKET_WAIT_TIME, 1);
1378 pkt_set_state(pkt, PACKET_WAITING_STATE);
1379 atomic_set(&pkt->run_sm, 1);
1380
1381 spin_lock(&pd->cdrw.active_list_lock);
1382 list_add(&pkt->list, &pd->cdrw.pkt_active_list);
1383 spin_unlock(&pd->cdrw.active_list_lock);
1384
1385 return 1;
1386}
1387
1388/*
1389 * Assemble a bio to write one packet and queue the bio for processing
1390 * by the underlying block device.
1391 */
1392static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt)
1393{
1394 struct bio *bio;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 int f;
1396 int frames_write;
Peter Osterlund72772322006-02-14 13:52:56 -08001397 struct bio_vec *bvec = pkt->w_bio->bi_io_vec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398
1399 for (f = 0; f < pkt->frames; f++) {
Peter Osterlund72772322006-02-14 13:52:56 -08001400 bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE];
1401 bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 }
1403
1404 /*
Peter Osterlund72772322006-02-14 13:52:56 -08001405 * Fill-in bvec with data from orig_bios.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 */
1407 frames_write = 0;
1408 spin_lock(&pkt->lock);
1409 for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
1410 int segment = bio->bi_idx;
1411 int src_offs = 0;
1412 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
1413 int num_frames = bio->bi_size / CD_FRAMESIZE;
1414 BUG_ON(first_frame < 0);
1415 BUG_ON(first_frame + num_frames > pkt->frames);
1416 for (f = first_frame; f < first_frame + num_frames; f++) {
1417 struct bio_vec *src_bvl = bio_iovec_idx(bio, segment);
1418
1419 while (src_offs >= src_bvl->bv_len) {
1420 src_offs -= src_bvl->bv_len;
1421 segment++;
1422 BUG_ON(segment >= bio->bi_vcnt);
1423 src_bvl = bio_iovec_idx(bio, segment);
1424 }
1425
1426 if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) {
Peter Osterlund72772322006-02-14 13:52:56 -08001427 bvec[f].bv_page = src_bvl->bv_page;
1428 bvec[f].bv_offset = src_bvl->bv_offset + src_offs;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 } else {
1430 pkt_copy_bio_data(bio, segment, src_offs,
Peter Osterlund72772322006-02-14 13:52:56 -08001431 bvec[f].bv_page, bvec[f].bv_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 }
1433 src_offs += CD_FRAMESIZE;
1434 frames_write++;
1435 }
1436 }
1437 pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE);
1438 spin_unlock(&pkt->lock);
1439
1440 VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n",
1441 frames_write, (unsigned long long)pkt->sector);
1442 BUG_ON(frames_write != pkt->write_size);
1443
1444 if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) {
Peter Osterlund72772322006-02-14 13:52:56 -08001445 pkt_make_local_copy(pkt, bvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 pkt->cache_valid = 1;
1447 } else {
1448 pkt->cache_valid = 0;
1449 }
1450
1451 /* Start the write request */
1452 bio_init(pkt->w_bio);
1453 pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE;
1454 pkt->w_bio->bi_sector = pkt->sector;
1455 pkt->w_bio->bi_bdev = pd->bdev;
1456 pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
1457 pkt->w_bio->bi_private = pkt;
Jens Axboe761a15e2007-09-14 13:06:53 +02001458 pkt->w_bio->bi_io_vec = bvec;
Laurent Riffard7e3da6c2007-09-21 08:32:28 +02001459 pkt->w_bio->bi_destructor = pkt_bio_destructor;
Peter Osterlund72772322006-02-14 13:52:56 -08001460 for (f = 0; f < pkt->frames; f++)
1461 if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset))
1462 BUG();
Thomas Maier78220822006-10-04 02:15:28 -07001463 VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
1465 atomic_set(&pkt->io_wait, 1);
1466 pkt->w_bio->bi_rw = WRITE;
Peter Osterlund46c271b2005-06-23 00:10:02 -07001467 pkt_queue_bio(pd, pkt->w_bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468}
1469
1470static void pkt_finish_packet(struct packet_data *pkt, int uptodate)
1471{
1472 struct bio *bio, *next;
1473
1474 if (!uptodate)
1475 pkt->cache_valid = 0;
1476
1477 /* Finish all bios corresponding to this packet */
1478 bio = pkt->orig_bios;
1479 while (bio) {
1480 next = bio->bi_next;
1481 bio->bi_next = NULL;
NeilBrown6712ecf2007-09-27 12:47:43 +02001482 bio_endio(bio, uptodate ? 0 : -EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 bio = next;
1484 }
1485 pkt->orig_bios = pkt->orig_bios_tail = NULL;
1486}
1487
1488static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt)
1489{
1490 int uptodate;
1491
1492 VPRINTK("run_state_machine: pkt %d\n", pkt->id);
1493
1494 for (;;) {
1495 switch (pkt->state) {
1496 case PACKET_WAITING_STATE:
1497 if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0))
1498 return;
1499
1500 pkt->sleep_time = 0;
1501 pkt_gather_data(pd, pkt);
1502 pkt_set_state(pkt, PACKET_READ_WAIT_STATE);
1503 break;
1504
1505 case PACKET_READ_WAIT_STATE:
1506 if (atomic_read(&pkt->io_wait) > 0)
1507 return;
1508
1509 if (atomic_read(&pkt->io_errors) > 0) {
1510 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1511 } else {
1512 pkt_start_write(pd, pkt);
1513 }
1514 break;
1515
1516 case PACKET_WRITE_WAIT_STATE:
1517 if (atomic_read(&pkt->io_wait) > 0)
1518 return;
1519
1520 if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) {
1521 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1522 } else {
1523 pkt_set_state(pkt, PACKET_RECOVERY_STATE);
1524 }
1525 break;
1526
1527 case PACKET_RECOVERY_STATE:
1528 if (pkt_start_recovery(pkt)) {
1529 pkt_start_write(pd, pkt);
1530 } else {
1531 VPRINTK("No recovery possible\n");
1532 pkt_set_state(pkt, PACKET_FINISHED_STATE);
1533 }
1534 break;
1535
1536 case PACKET_FINISHED_STATE:
1537 uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags);
1538 pkt_finish_packet(pkt, uptodate);
1539 return;
1540
1541 default:
1542 BUG();
1543 break;
1544 }
1545 }
1546}
1547
1548static void pkt_handle_packets(struct pktcdvd_device *pd)
1549{
1550 struct packet_data *pkt, *next;
1551
1552 VPRINTK("pkt_handle_packets\n");
1553
1554 /*
1555 * Run state machine for active packets
1556 */
1557 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1558 if (atomic_read(&pkt->run_sm) > 0) {
1559 atomic_set(&pkt->run_sm, 0);
1560 pkt_run_state_machine(pd, pkt);
1561 }
1562 }
1563
1564 /*
1565 * Move no longer active packets to the free list
1566 */
1567 spin_lock(&pd->cdrw.active_list_lock);
1568 list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) {
1569 if (pkt->state == PACKET_FINISHED_STATE) {
1570 list_del(&pkt->list);
1571 pkt_put_packet_data(pd, pkt);
1572 pkt_set_state(pkt, PACKET_IDLE_STATE);
1573 atomic_set(&pd->scan_queue, 1);
1574 }
1575 }
1576 spin_unlock(&pd->cdrw.active_list_lock);
1577}
1578
1579static void pkt_count_states(struct pktcdvd_device *pd, int *states)
1580{
1581 struct packet_data *pkt;
1582 int i;
1583
Peter Osterlundae7642b2005-11-13 16:06:36 -08001584 for (i = 0; i < PACKET_NUM_STATES; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 states[i] = 0;
1586
1587 spin_lock(&pd->cdrw.active_list_lock);
1588 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1589 states[pkt->state]++;
1590 }
1591 spin_unlock(&pd->cdrw.active_list_lock);
1592}
1593
1594/*
1595 * kcdrwd is woken up when writes have been queued for one of our
1596 * registered devices
1597 */
1598static int kcdrwd(void *foobar)
1599{
1600 struct pktcdvd_device *pd = foobar;
1601 struct packet_data *pkt;
1602 long min_sleep_time, residue;
1603
1604 set_user_nice(current, -20);
Rafael J. Wysocki83144182007-07-17 04:03:35 -07001605 set_freezable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
1607 for (;;) {
1608 DECLARE_WAITQUEUE(wait, current);
1609
1610 /*
1611 * Wait until there is something to do
1612 */
1613 add_wait_queue(&pd->wqueue, &wait);
1614 for (;;) {
1615 set_current_state(TASK_INTERRUPTIBLE);
1616
1617 /* Check if we need to run pkt_handle_queue */
1618 if (atomic_read(&pd->scan_queue) > 0)
1619 goto work_to_do;
1620
1621 /* Check if we need to run the state machine for some packet */
1622 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1623 if (atomic_read(&pkt->run_sm) > 0)
1624 goto work_to_do;
1625 }
1626
1627 /* Check if we need to process the iosched queues */
1628 if (atomic_read(&pd->iosched.attention) != 0)
1629 goto work_to_do;
1630
1631 /* Otherwise, go to sleep */
1632 if (PACKET_DEBUG > 1) {
1633 int states[PACKET_NUM_STATES];
1634 pkt_count_states(pd, states);
1635 VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
1636 states[0], states[1], states[2], states[3],
1637 states[4], states[5]);
1638 }
1639
1640 min_sleep_time = MAX_SCHEDULE_TIMEOUT;
1641 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1642 if (pkt->sleep_time && pkt->sleep_time < min_sleep_time)
1643 min_sleep_time = pkt->sleep_time;
1644 }
1645
1646 generic_unplug_device(bdev_get_queue(pd->bdev));
1647
1648 VPRINTK("kcdrwd: sleeping\n");
1649 residue = schedule_timeout(min_sleep_time);
1650 VPRINTK("kcdrwd: wake up\n");
1651
1652 /* make swsusp happy with our thread */
Christoph Lameter3e1d1d22005-06-24 23:13:50 -07001653 try_to_freeze();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654
1655 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
1656 if (!pkt->sleep_time)
1657 continue;
1658 pkt->sleep_time -= min_sleep_time - residue;
1659 if (pkt->sleep_time <= 0) {
1660 pkt->sleep_time = 0;
1661 atomic_inc(&pkt->run_sm);
1662 }
1663 }
1664
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 if (kthread_should_stop())
1666 break;
1667 }
1668work_to_do:
1669 set_current_state(TASK_RUNNING);
1670 remove_wait_queue(&pd->wqueue, &wait);
1671
1672 if (kthread_should_stop())
1673 break;
1674
1675 /*
1676 * if pkt_handle_queue returns true, we can queue
1677 * another request.
1678 */
1679 while (pkt_handle_queue(pd))
1680 ;
1681
1682 /*
1683 * Handle packet state machine
1684 */
1685 pkt_handle_packets(pd);
1686
1687 /*
1688 * Handle iosched queues
1689 */
1690 pkt_iosched_process_queue(pd);
1691 }
1692
1693 return 0;
1694}
1695
1696static void pkt_print_settings(struct pktcdvd_device *pd)
1697{
Thomas Maier78220822006-10-04 02:15:28 -07001698 printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 printk("%u blocks, ", pd->settings.size >> 2);
1700 printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2');
1701}
1702
1703static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control)
1704{
1705 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1706
1707 cgc->cmd[0] = GPCMD_MODE_SENSE_10;
1708 cgc->cmd[2] = page_code | (page_control << 6);
1709 cgc->cmd[7] = cgc->buflen >> 8;
1710 cgc->cmd[8] = cgc->buflen & 0xff;
1711 cgc->data_direction = CGC_DATA_READ;
1712 return pkt_generic_packet(pd, cgc);
1713}
1714
1715static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc)
1716{
1717 memset(cgc->cmd, 0, sizeof(cgc->cmd));
1718 memset(cgc->buffer, 0, 2);
1719 cgc->cmd[0] = GPCMD_MODE_SELECT_10;
1720 cgc->cmd[1] = 0x10; /* PF */
1721 cgc->cmd[7] = cgc->buflen >> 8;
1722 cgc->cmd[8] = cgc->buflen & 0xff;
1723 cgc->data_direction = CGC_DATA_WRITE;
1724 return pkt_generic_packet(pd, cgc);
1725}
1726
1727static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di)
1728{
1729 struct packet_command cgc;
1730 int ret;
1731
1732 /* set up command and get the disc info */
1733 init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ);
1734 cgc.cmd[0] = GPCMD_READ_DISC_INFO;
1735 cgc.cmd[8] = cgc.buflen = 2;
1736 cgc.quiet = 1;
1737
1738 if ((ret = pkt_generic_packet(pd, &cgc)))
1739 return ret;
1740
1741 /* not all drives have the same disc_info length, so requeue
1742 * packet with the length the drive tells us it can supply
1743 */
1744 cgc.buflen = be16_to_cpu(di->disc_information_length) +
1745 sizeof(di->disc_information_length);
1746
1747 if (cgc.buflen > sizeof(disc_information))
1748 cgc.buflen = sizeof(disc_information);
1749
1750 cgc.cmd[8] = cgc.buflen;
1751 return pkt_generic_packet(pd, &cgc);
1752}
1753
1754static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti)
1755{
1756 struct packet_command cgc;
1757 int ret;
1758
1759 init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ);
1760 cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO;
1761 cgc.cmd[1] = type & 3;
1762 cgc.cmd[4] = (track & 0xff00) >> 8;
1763 cgc.cmd[5] = track & 0xff;
1764 cgc.cmd[8] = 8;
1765 cgc.quiet = 1;
1766
1767 if ((ret = pkt_generic_packet(pd, &cgc)))
1768 return ret;
1769
1770 cgc.buflen = be16_to_cpu(ti->track_information_length) +
1771 sizeof(ti->track_information_length);
1772
1773 if (cgc.buflen > sizeof(track_information))
1774 cgc.buflen = sizeof(track_information);
1775
1776 cgc.cmd[8] = cgc.buflen;
1777 return pkt_generic_packet(pd, &cgc);
1778}
1779
Peter Osterlund05680d82008-03-04 14:28:41 -08001780static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd,
1781 long *last_written)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782{
1783 disc_information di;
1784 track_information ti;
1785 __u32 last_track;
1786 int ret = -1;
1787
1788 if ((ret = pkt_get_disc_info(pd, &di)))
1789 return ret;
1790
1791 last_track = (di.last_track_msb << 8) | di.last_track_lsb;
1792 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1793 return ret;
1794
1795 /* if this track is blank, try the previous. */
1796 if (ti.blank) {
1797 last_track--;
1798 if ((ret = pkt_get_track_info(pd, last_track, 1, &ti)))
1799 return ret;
1800 }
1801
1802 /* if last recorded field is valid, return it. */
1803 if (ti.lra_v) {
1804 *last_written = be32_to_cpu(ti.last_rec_address);
1805 } else {
1806 /* make it up instead */
1807 *last_written = be32_to_cpu(ti.track_start) +
1808 be32_to_cpu(ti.track_size);
1809 if (ti.free_blocks)
1810 *last_written -= (be32_to_cpu(ti.free_blocks) + 7);
1811 }
1812 return 0;
1813}
1814
1815/*
1816 * write mode select package based on pd->settings
1817 */
Peter Osterlund05680d82008-03-04 14:28:41 -08001818static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819{
1820 struct packet_command cgc;
1821 struct request_sense sense;
1822 write_param_page *wp;
1823 char buffer[128];
1824 int ret, size;
1825
1826 /* doesn't apply to DVD+RW or DVD-RAM */
1827 if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12))
1828 return 0;
1829
1830 memset(buffer, 0, sizeof(buffer));
1831 init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
1832 cgc.sense = &sense;
1833 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1834 pkt_dump_sense(&cgc);
1835 return ret;
1836 }
1837
1838 size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff));
1839 pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff);
1840 if (size > sizeof(buffer))
1841 size = sizeof(buffer);
1842
1843 /*
1844 * now get it all
1845 */
1846 init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ);
1847 cgc.sense = &sense;
1848 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) {
1849 pkt_dump_sense(&cgc);
1850 return ret;
1851 }
1852
1853 /*
1854 * write page is offset header + block descriptor length
1855 */
1856 wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset];
1857
1858 wp->fp = pd->settings.fp;
1859 wp->track_mode = pd->settings.track_mode;
1860 wp->write_type = pd->settings.write_type;
1861 wp->data_block_type = pd->settings.block_mode;
1862
1863 wp->multi_session = 0;
1864
1865#ifdef PACKET_USE_LS
1866 wp->link_size = 7;
1867 wp->ls_v = 1;
1868#endif
1869
1870 if (wp->data_block_type == PACKET_BLOCK_MODE1) {
1871 wp->session_format = 0;
1872 wp->subhdr2 = 0x20;
1873 } else if (wp->data_block_type == PACKET_BLOCK_MODE2) {
1874 wp->session_format = 0x20;
1875 wp->subhdr2 = 8;
1876#if 0
1877 wp->mcn[0] = 0x80;
1878 memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1);
1879#endif
1880 } else {
1881 /*
1882 * paranoia
1883 */
Thomas Maier78220822006-10-04 02:15:28 -07001884 printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 return 1;
1886 }
1887 wp->packet_size = cpu_to_be32(pd->settings.size >> 2);
1888
1889 cgc.buflen = cgc.cmd[8] = size;
1890 if ((ret = pkt_mode_select(pd, &cgc))) {
1891 pkt_dump_sense(&cgc);
1892 return ret;
1893 }
1894
1895 pkt_print_settings(pd);
1896 return 0;
1897}
1898
1899/*
Peter Osterlund7c613d52006-02-20 18:28:02 -08001900 * 1 -- we can write to this track, 0 -- we can't
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 */
Peter Osterlundab863ec2006-02-20 18:28:04 -08001902static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903{
Peter Osterlundab863ec2006-02-20 18:28:04 -08001904 switch (pd->mmc3_profile) {
1905 case 0x1a: /* DVD+RW */
1906 case 0x12: /* DVD-RAM */
1907 /* The track is always writable on DVD+RW/DVD-RAM */
1908 return 1;
1909 default:
1910 break;
1911 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912
Peter Osterlundab863ec2006-02-20 18:28:04 -08001913 if (!ti->packet || !ti->fp)
1914 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915
1916 /*
1917 * "good" settings as per Mt Fuji.
1918 */
Peter Osterlundab863ec2006-02-20 18:28:04 -08001919 if (ti->rt == 0 && ti->blank == 0)
Peter Osterlund7c613d52006-02-20 18:28:02 -08001920 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921
Peter Osterlundab863ec2006-02-20 18:28:04 -08001922 if (ti->rt == 0 && ti->blank == 1)
Peter Osterlund7c613d52006-02-20 18:28:02 -08001923 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
Peter Osterlundab863ec2006-02-20 18:28:04 -08001925 if (ti->rt == 1 && ti->blank == 0)
Peter Osterlund7c613d52006-02-20 18:28:02 -08001926 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927
Thomas Maier78220822006-10-04 02:15:28 -07001928 printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet);
Peter Osterlund7c613d52006-02-20 18:28:02 -08001929 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930}
1931
1932/*
Peter Osterlund7c613d52006-02-20 18:28:02 -08001933 * 1 -- we can write to this disc, 0 -- we can't
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 */
Peter Osterlund7c613d52006-02-20 18:28:02 -08001935static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936{
1937 switch (pd->mmc3_profile) {
1938 case 0x0a: /* CD-RW */
1939 case 0xffff: /* MMC3 not supported */
1940 break;
1941 case 0x1a: /* DVD+RW */
1942 case 0x13: /* DVD-RW */
1943 case 0x12: /* DVD-RAM */
Peter Osterlund7c613d52006-02-20 18:28:02 -08001944 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945 default:
Thomas Maier78220822006-10-04 02:15:28 -07001946 VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile);
Peter Osterlund7c613d52006-02-20 18:28:02 -08001947 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 }
1949
1950 /*
1951 * for disc type 0xff we should probably reserve a new track.
1952 * but i'm not sure, should we leave this to user apps? probably.
1953 */
1954 if (di->disc_type == 0xff) {
Thomas Maier78220822006-10-04 02:15:28 -07001955 printk(DRIVER_NAME": Unknown disc. No track?\n");
Peter Osterlund7c613d52006-02-20 18:28:02 -08001956 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 }
1958
1959 if (di->disc_type != 0x20 && di->disc_type != 0) {
Thomas Maier78220822006-10-04 02:15:28 -07001960 printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type);
Peter Osterlund7c613d52006-02-20 18:28:02 -08001961 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001962 }
1963
1964 if (di->erasable == 0) {
Thomas Maier78220822006-10-04 02:15:28 -07001965 printk(DRIVER_NAME": Disc not erasable\n");
Peter Osterlund7c613d52006-02-20 18:28:02 -08001966 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 }
1968
1969 if (di->border_status == PACKET_SESSION_RESERVED) {
Thomas Maier78220822006-10-04 02:15:28 -07001970 printk(DRIVER_NAME": Can't write to last track (reserved)\n");
Peter Osterlund7c613d52006-02-20 18:28:02 -08001971 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 }
1973
Peter Osterlund7c613d52006-02-20 18:28:02 -08001974 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975}
1976
Peter Osterlund05680d82008-03-04 14:28:41 -08001977static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978{
1979 struct packet_command cgc;
1980 unsigned char buf[12];
1981 disc_information di;
1982 track_information ti;
1983 int ret, track;
1984
1985 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
1986 cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
1987 cgc.cmd[8] = 8;
1988 ret = pkt_generic_packet(pd, &cgc);
1989 pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
1990
1991 memset(&di, 0, sizeof(disc_information));
1992 memset(&ti, 0, sizeof(track_information));
1993
1994 if ((ret = pkt_get_disc_info(pd, &di))) {
1995 printk("failed get_disc\n");
1996 return ret;
1997 }
1998
Peter Osterlund7c613d52006-02-20 18:28:02 -08001999 if (!pkt_writable_disc(pd, &di))
Peter Osterlund9db91542006-02-20 18:28:04 -08002000 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002 pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR;
2003
2004 track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */
2005 if ((ret = pkt_get_track_info(pd, track, 1, &ti))) {
Thomas Maier78220822006-10-04 02:15:28 -07002006 printk(DRIVER_NAME": failed get_track\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007 return ret;
2008 }
2009
Peter Osterlundab863ec2006-02-20 18:28:04 -08002010 if (!pkt_writable_track(pd, &ti)) {
Thomas Maier78220822006-10-04 02:15:28 -07002011 printk(DRIVER_NAME": can't write to this track\n");
Peter Osterlund9db91542006-02-20 18:28:04 -08002012 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013 }
2014
2015 /*
2016 * we keep packet size in 512 byte units, makes it easier to
2017 * deal with request calculations.
2018 */
2019 pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2;
2020 if (pd->settings.size == 0) {
Thomas Maier78220822006-10-04 02:15:28 -07002021 printk(DRIVER_NAME": detected zero packet size!\n");
Phillip Susia460ad62006-02-04 23:27:44 -08002022 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 }
Peter Osterlundd0272e72005-09-13 01:25:27 -07002024 if (pd->settings.size > PACKET_MAX_SECTORS) {
Thomas Maier78220822006-10-04 02:15:28 -07002025 printk(DRIVER_NAME": packet size is too big\n");
Peter Osterlund9db91542006-02-20 18:28:04 -08002026 return -EROFS;
Peter Osterlundd0272e72005-09-13 01:25:27 -07002027 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028 pd->settings.fp = ti.fp;
2029 pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1);
2030
2031 if (ti.nwa_v) {
2032 pd->nwa = be32_to_cpu(ti.next_writable);
2033 set_bit(PACKET_NWA_VALID, &pd->flags);
2034 }
2035
2036 /*
2037 * in theory we could use lra on -RW media as well and just zero
2038 * blocks that haven't been written yet, but in practice that
2039 * is just a no-go. we'll use that for -R, naturally.
2040 */
2041 if (ti.lra_v) {
2042 pd->lra = be32_to_cpu(ti.last_rec_address);
2043 set_bit(PACKET_LRA_VALID, &pd->flags);
2044 } else {
2045 pd->lra = 0xffffffff;
2046 set_bit(PACKET_LRA_VALID, &pd->flags);
2047 }
2048
2049 /*
2050 * fine for now
2051 */
2052 pd->settings.link_loss = 7;
2053 pd->settings.write_type = 0; /* packet */
2054 pd->settings.track_mode = ti.track_mode;
2055
2056 /*
2057 * mode1 or mode2 disc
2058 */
2059 switch (ti.data_mode) {
2060 case PACKET_MODE1:
2061 pd->settings.block_mode = PACKET_BLOCK_MODE1;
2062 break;
2063 case PACKET_MODE2:
2064 pd->settings.block_mode = PACKET_BLOCK_MODE2;
2065 break;
2066 default:
Thomas Maier78220822006-10-04 02:15:28 -07002067 printk(DRIVER_NAME": unknown data mode\n");
Peter Osterlund9db91542006-02-20 18:28:04 -08002068 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069 }
2070 return 0;
2071}
2072
2073/*
2074 * enable/disable write caching on drive
2075 */
Peter Osterlund05680d82008-03-04 14:28:41 -08002076static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd,
2077 int set)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078{
2079 struct packet_command cgc;
2080 struct request_sense sense;
2081 unsigned char buf[64];
2082 int ret;
2083
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ);
2085 cgc.sense = &sense;
2086 cgc.buflen = pd->mode_offset + 12;
2087
2088 /*
2089 * caching mode page might not be there, so quiet this command
2090 */
2091 cgc.quiet = 1;
2092
2093 if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0)))
2094 return ret;
2095
2096 buf[pd->mode_offset + 10] |= (!!set << 2);
2097
2098 cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff));
2099 ret = pkt_mode_select(pd, &cgc);
2100 if (ret) {
Thomas Maier78220822006-10-04 02:15:28 -07002101 printk(DRIVER_NAME": write caching control failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 pkt_dump_sense(&cgc);
2103 } else if (!ret && set)
Thomas Maier78220822006-10-04 02:15:28 -07002104 printk(DRIVER_NAME": enabled write caching on %s\n", pd->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 return ret;
2106}
2107
2108static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag)
2109{
2110 struct packet_command cgc;
2111
2112 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2113 cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
2114 cgc.cmd[4] = lockflag ? 1 : 0;
2115 return pkt_generic_packet(pd, &cgc);
2116}
2117
2118/*
2119 * Returns drive maximum write speed
2120 */
Peter Osterlund05680d82008-03-04 14:28:41 -08002121static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd,
2122 unsigned *write_speed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123{
2124 struct packet_command cgc;
2125 struct request_sense sense;
2126 unsigned char buf[256+18];
2127 unsigned char *cap_buf;
2128 int ret, offset;
2129
Linus Torvalds1da177e2005-04-16 15:20:36 -07002130 cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset];
2131 init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN);
2132 cgc.sense = &sense;
2133
2134 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2135 if (ret) {
2136 cgc.buflen = pd->mode_offset + cap_buf[1] + 2 +
2137 sizeof(struct mode_page_header);
2138 ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
2139 if (ret) {
2140 pkt_dump_sense(&cgc);
2141 return ret;
2142 }
2143 }
2144
2145 offset = 20; /* Obsoleted field, used by older drives */
2146 if (cap_buf[1] >= 28)
2147 offset = 28; /* Current write speed selected */
2148 if (cap_buf[1] >= 30) {
2149 /* If the drive reports at least one "Logical Unit Write
2150 * Speed Performance Descriptor Block", use the information
2151 * in the first block. (contains the highest speed)
2152 */
2153 int num_spdb = (cap_buf[30] << 8) + cap_buf[31];
2154 if (num_spdb > 0)
2155 offset = 34;
2156 }
2157
2158 *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1];
2159 return 0;
2160}
2161
2162/* These tables from cdrecord - I don't have orange book */
2163/* standard speed CD-RW (1-4x) */
2164static char clv_to_speed[16] = {
2165 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2166 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2167};
2168/* high speed CD-RW (-10x) */
2169static char hs_clv_to_speed[16] = {
2170 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2171 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
2172};
2173/* ultra high speed CD-RW */
2174static char us_clv_to_speed[16] = {
2175 /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */
2176 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0
2177};
2178
2179/*
2180 * reads the maximum media speed from ATIP
2181 */
Peter Osterlund05680d82008-03-04 14:28:41 -08002182static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd,
2183 unsigned *speed)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002184{
2185 struct packet_command cgc;
2186 struct request_sense sense;
2187 unsigned char buf[64];
2188 unsigned int size, st, sp;
2189 int ret;
2190
2191 init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ);
2192 cgc.sense = &sense;
2193 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2194 cgc.cmd[1] = 2;
2195 cgc.cmd[2] = 4; /* READ ATIP */
2196 cgc.cmd[8] = 2;
2197 ret = pkt_generic_packet(pd, &cgc);
2198 if (ret) {
2199 pkt_dump_sense(&cgc);
2200 return ret;
2201 }
2202 size = ((unsigned int) buf[0]<<8) + buf[1] + 2;
2203 if (size > sizeof(buf))
2204 size = sizeof(buf);
2205
2206 init_cdrom_command(&cgc, buf, size, CGC_DATA_READ);
2207 cgc.sense = &sense;
2208 cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
2209 cgc.cmd[1] = 2;
2210 cgc.cmd[2] = 4;
2211 cgc.cmd[8] = size;
2212 ret = pkt_generic_packet(pd, &cgc);
2213 if (ret) {
2214 pkt_dump_sense(&cgc);
2215 return ret;
2216 }
2217
Alexey Dobriyaneaa0ff12008-02-06 01:36:06 -08002218 if (!(buf[6] & 0x40)) {
Thomas Maier78220822006-10-04 02:15:28 -07002219 printk(DRIVER_NAME": Disc type is not CD-RW\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220 return 1;
2221 }
Alexey Dobriyaneaa0ff12008-02-06 01:36:06 -08002222 if (!(buf[6] & 0x4)) {
Thomas Maier78220822006-10-04 02:15:28 -07002223 printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 return 1;
2225 }
2226
2227 st = (buf[6] >> 3) & 0x7; /* disc sub-type */
2228
2229 sp = buf[16] & 0xf; /* max speed from ATIP A1 field */
2230
2231 /* Info from cdrecord */
2232 switch (st) {
2233 case 0: /* standard speed */
2234 *speed = clv_to_speed[sp];
2235 break;
2236 case 1: /* high speed */
2237 *speed = hs_clv_to_speed[sp];
2238 break;
2239 case 2: /* ultra high speed */
2240 *speed = us_clv_to_speed[sp];
2241 break;
2242 default:
Thomas Maier78220822006-10-04 02:15:28 -07002243 printk(DRIVER_NAME": Unknown disc sub-type %d\n",st);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002244 return 1;
2245 }
2246 if (*speed) {
Thomas Maier78220822006-10-04 02:15:28 -07002247 printk(DRIVER_NAME": Max. media speed: %d\n",*speed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 return 0;
2249 } else {
Thomas Maier78220822006-10-04 02:15:28 -07002250 printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251 return 1;
2252 }
2253}
2254
Peter Osterlund05680d82008-03-04 14:28:41 -08002255static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256{
2257 struct packet_command cgc;
2258 struct request_sense sense;
2259 int ret;
2260
Thomas Maier78220822006-10-04 02:15:28 -07002261 VPRINTK(DRIVER_NAME": Performing OPC\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262
2263 init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
2264 cgc.sense = &sense;
2265 cgc.timeout = 60*HZ;
2266 cgc.cmd[0] = GPCMD_SEND_OPC;
2267 cgc.cmd[1] = 1;
2268 if ((ret = pkt_generic_packet(pd, &cgc)))
2269 pkt_dump_sense(&cgc);
2270 return ret;
2271}
2272
2273static int pkt_open_write(struct pktcdvd_device *pd)
2274{
2275 int ret;
2276 unsigned int write_speed, media_write_speed, read_speed;
2277
2278 if ((ret = pkt_probe_settings(pd))) {
Thomas Maier78220822006-10-04 02:15:28 -07002279 VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name);
Peter Osterlund9db91542006-02-20 18:28:04 -08002280 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281 }
2282
2283 if ((ret = pkt_set_write_settings(pd))) {
Thomas Maier78220822006-10-04 02:15:28 -07002284 DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285 return -EIO;
2286 }
2287
2288 pkt_write_caching(pd, USE_WCACHING);
2289
2290 if ((ret = pkt_get_max_speed(pd, &write_speed)))
2291 write_speed = 16 * 177;
2292 switch (pd->mmc3_profile) {
2293 case 0x13: /* DVD-RW */
2294 case 0x1a: /* DVD+RW */
2295 case 0x12: /* DVD-RAM */
Thomas Maier78220822006-10-04 02:15:28 -07002296 DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 break;
2298 default:
2299 if ((ret = pkt_media_speed(pd, &media_write_speed)))
2300 media_write_speed = 16;
2301 write_speed = min(write_speed, media_write_speed * 177);
Thomas Maier78220822006-10-04 02:15:28 -07002302 DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303 break;
2304 }
2305 read_speed = write_speed;
2306
2307 if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
Thomas Maier78220822006-10-04 02:15:28 -07002308 DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 return -EIO;
2310 }
2311 pd->write_speed = write_speed;
2312 pd->read_speed = read_speed;
2313
2314 if ((ret = pkt_perform_opc(pd))) {
Thomas Maier78220822006-10-04 02:15:28 -07002315 DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316 }
2317
2318 return 0;
2319}
2320
2321/*
2322 * called at open time.
2323 */
2324static int pkt_open_dev(struct pktcdvd_device *pd, int write)
2325{
2326 int ret;
2327 long lba;
Jens Axboe165125e2007-07-24 09:28:11 +02002328 struct request_queue *q;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329
2330 /*
2331 * We need to re-open the cdrom device without O_NONBLOCK to be able
2332 * to read/write from/to it. It is already opened in O_NONBLOCK mode
2333 * so bdget() can't fail.
2334 */
2335 bdget(pd->bdev->bd_dev);
2336 if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY)))
2337 goto out;
2338
Peter Osterlund8382bf22006-01-08 01:02:17 -08002339 if ((ret = bd_claim(pd->bdev, pd)))
2340 goto out_putdev;
2341
Linus Torvalds1da177e2005-04-16 15:20:36 -07002342 if ((ret = pkt_get_last_written(pd, &lba))) {
Thomas Maier78220822006-10-04 02:15:28 -07002343 printk(DRIVER_NAME": pkt_get_last_written failed\n");
Peter Osterlund8382bf22006-01-08 01:02:17 -08002344 goto out_unclaim;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 }
2346
2347 set_capacity(pd->disk, lba << 2);
2348 set_capacity(pd->bdev->bd_disk, lba << 2);
2349 bd_set_size(pd->bdev, (loff_t)lba << 11);
2350
2351 q = bdev_get_queue(pd->bdev);
2352 if (write) {
2353 if ((ret = pkt_open_write(pd)))
Peter Osterlund8382bf22006-01-08 01:02:17 -08002354 goto out_unclaim;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 /*
2356 * Some CDRW drives can not handle writes larger than one packet,
2357 * even if the size is a multiple of the packet size.
2358 */
2359 spin_lock_irq(q->queue_lock);
2360 blk_queue_max_sectors(q, pd->settings.size);
2361 spin_unlock_irq(q->queue_lock);
2362 set_bit(PACKET_WRITABLE, &pd->flags);
2363 } else {
2364 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
2365 clear_bit(PACKET_WRITABLE, &pd->flags);
2366 }
2367
2368 if ((ret = pkt_set_segment_merging(pd, q)))
Peter Osterlund8382bf22006-01-08 01:02:17 -08002369 goto out_unclaim;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002371 if (write) {
2372 if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) {
Thomas Maier78220822006-10-04 02:15:28 -07002373 printk(DRIVER_NAME": not enough memory for buffers\n");
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002374 ret = -ENOMEM;
2375 goto out_unclaim;
2376 }
Thomas Maier78220822006-10-04 02:15:28 -07002377 printk(DRIVER_NAME": %lukB available on disc\n", lba << 1);
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002378 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002379
2380 return 0;
2381
Peter Osterlund8382bf22006-01-08 01:02:17 -08002382out_unclaim:
2383 bd_release(pd->bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002384out_putdev:
2385 blkdev_put(pd->bdev);
2386out:
2387 return ret;
2388}
2389
2390/*
2391 * called when the device is closed. makes sure that the device flushes
2392 * the internal cache before we close.
2393 */
2394static void pkt_release_dev(struct pktcdvd_device *pd, int flush)
2395{
2396 if (flush && pkt_flush_cache(pd))
Thomas Maier78220822006-10-04 02:15:28 -07002397 DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002398
2399 pkt_lock_door(pd, 0);
2400
2401 pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
Peter Osterlund8382bf22006-01-08 01:02:17 -08002402 bd_release(pd->bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 blkdev_put(pd->bdev);
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002404
2405 pkt_shrink_pktlist(pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002406}
2407
2408static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor)
2409{
2410 if (dev_minor >= MAX_WRITERS)
2411 return NULL;
2412 return pkt_devs[dev_minor];
2413}
2414
2415static int pkt_open(struct inode *inode, struct file *file)
2416{
2417 struct pktcdvd_device *pd = NULL;
2418 int ret;
2419
Thomas Maier78220822006-10-04 02:15:28 -07002420 VPRINTK(DRIVER_NAME": entering open\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002421
Jes Sorensen1657f822006-03-23 03:00:25 -08002422 mutex_lock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002423 pd = pkt_find_dev_from_minor(iminor(inode));
2424 if (!pd) {
2425 ret = -ENODEV;
2426 goto out;
2427 }
2428 BUG_ON(pd->refcnt < 0);
2429
2430 pd->refcnt++;
Peter Osterlund46f4e1b2005-05-20 13:59:06 -07002431 if (pd->refcnt > 1) {
2432 if ((file->f_mode & FMODE_WRITE) &&
2433 !test_bit(PACKET_WRITABLE, &pd->flags)) {
2434 ret = -EBUSY;
2435 goto out_dec;
2436 }
2437 } else {
Peter Osterlund01fd9fd2006-02-14 13:52:55 -08002438 ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE);
2439 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002440 goto out_dec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002441 /*
2442 * needed here as well, since ext2 (among others) may change
2443 * the blocksize at mount time
2444 */
2445 set_blocksize(inode->i_bdev, CD_FRAMESIZE);
2446 }
2447
Jes Sorensen1657f822006-03-23 03:00:25 -08002448 mutex_unlock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449 return 0;
2450
2451out_dec:
2452 pd->refcnt--;
2453out:
Thomas Maier78220822006-10-04 02:15:28 -07002454 VPRINTK(DRIVER_NAME": failed open (%d)\n", ret);
Jes Sorensen1657f822006-03-23 03:00:25 -08002455 mutex_unlock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002456 return ret;
2457}
2458
2459static int pkt_close(struct inode *inode, struct file *file)
2460{
2461 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
2462 int ret = 0;
2463
Jes Sorensen1657f822006-03-23 03:00:25 -08002464 mutex_lock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 pd->refcnt--;
2466 BUG_ON(pd->refcnt < 0);
2467 if (pd->refcnt == 0) {
2468 int flush = test_bit(PACKET_WRITABLE, &pd->flags);
2469 pkt_release_dev(pd, flush);
2470 }
Jes Sorensen1657f822006-03-23 03:00:25 -08002471 mutex_unlock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002472 return ret;
2473}
2474
2475
NeilBrown6712ecf2007-09-27 12:47:43 +02002476static void pkt_end_io_read_cloned(struct bio *bio, int err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002477{
2478 struct packet_stacked_data *psd = bio->bi_private;
2479 struct pktcdvd_device *pd = psd->pd;
2480
Linus Torvalds1da177e2005-04-16 15:20:36 -07002481 bio_put(bio);
NeilBrown6712ecf2007-09-27 12:47:43 +02002482 bio_endio(psd->bio, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002483 mempool_free(psd, psd_pool);
2484 pkt_bio_finished(pd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002485}
2486
Jens Axboe165125e2007-07-24 09:28:11 +02002487static int pkt_make_request(struct request_queue *q, struct bio *bio)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488{
2489 struct pktcdvd_device *pd;
2490 char b[BDEVNAME_SIZE];
2491 sector_t zone;
2492 struct packet_data *pkt;
2493 int was_empty, blocked_bio;
2494 struct pkt_rb_node *node;
2495
2496 pd = q->queuedata;
2497 if (!pd) {
Thomas Maier78220822006-10-04 02:15:28 -07002498 printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002499 goto end_io;
2500 }
2501
2502 /*
2503 * Clone READ bios so we can have our own bi_end_io callback.
2504 */
2505 if (bio_data_dir(bio) == READ) {
2506 struct bio *cloned_bio = bio_clone(bio, GFP_NOIO);
2507 struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO);
2508
2509 psd->pd = pd;
2510 psd->bio = bio;
2511 cloned_bio->bi_bdev = pd->bdev;
2512 cloned_bio->bi_private = psd;
2513 cloned_bio->bi_end_io = pkt_end_io_read_cloned;
2514 pd->stats.secs_r += bio->bi_size >> 9;
Peter Osterlund46c271b2005-06-23 00:10:02 -07002515 pkt_queue_bio(pd, cloned_bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002516 return 0;
2517 }
2518
2519 if (!test_bit(PACKET_WRITABLE, &pd->flags)) {
Thomas Maier78220822006-10-04 02:15:28 -07002520 printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521 pd->name, (unsigned long long)bio->bi_sector);
2522 goto end_io;
2523 }
2524
2525 if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) {
Thomas Maier78220822006-10-04 02:15:28 -07002526 printk(DRIVER_NAME": wrong bio size\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527 goto end_io;
2528 }
2529
2530 blk_queue_bounce(q, &bio);
2531
2532 zone = ZONE(bio->bi_sector, pd);
2533 VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n",
2534 (unsigned long long)bio->bi_sector,
2535 (unsigned long long)(bio->bi_sector + bio_sectors(bio)));
2536
2537 /* Check if we have to split the bio */
2538 {
2539 struct bio_pair *bp;
2540 sector_t last_zone;
2541 int first_sectors;
2542
2543 last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd);
2544 if (last_zone != zone) {
2545 BUG_ON(last_zone != zone + pd->settings.size);
2546 first_sectors = last_zone - bio->bi_sector;
2547 bp = bio_split(bio, bio_split_pool, first_sectors);
2548 BUG_ON(!bp);
2549 pkt_make_request(q, &bp->bio1);
2550 pkt_make_request(q, &bp->bio2);
2551 bio_pair_release(bp);
2552 return 0;
2553 }
2554 }
2555
2556 /*
2557 * If we find a matching packet in state WAITING or READ_WAIT, we can
2558 * just append this bio to that packet.
2559 */
2560 spin_lock(&pd->cdrw.active_list_lock);
2561 blocked_bio = 0;
2562 list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) {
2563 if (pkt->sector == zone) {
2564 spin_lock(&pkt->lock);
2565 if ((pkt->state == PACKET_WAITING_STATE) ||
2566 (pkt->state == PACKET_READ_WAIT_STATE)) {
2567 pkt_add_list_last(bio, &pkt->orig_bios,
2568 &pkt->orig_bios_tail);
2569 pkt->write_size += bio->bi_size / CD_FRAMESIZE;
2570 if ((pkt->write_size >= pkt->frames) &&
2571 (pkt->state == PACKET_WAITING_STATE)) {
2572 atomic_inc(&pkt->run_sm);
2573 wake_up(&pd->wqueue);
2574 }
2575 spin_unlock(&pkt->lock);
2576 spin_unlock(&pd->cdrw.active_list_lock);
2577 return 0;
2578 } else {
2579 blocked_bio = 1;
2580 }
2581 spin_unlock(&pkt->lock);
2582 }
2583 }
2584 spin_unlock(&pd->cdrw.active_list_lock);
2585
Thomas Maier0a0fc962006-12-08 02:36:11 -08002586 /*
2587 * Test if there is enough room left in the bio work queue
2588 * (queue size >= congestion on mark).
2589 * If not, wait till the work queue size is below the congestion off mark.
2590 */
2591 spin_lock(&pd->lock);
2592 if (pd->write_congestion_on > 0
2593 && pd->bio_queue_size >= pd->write_congestion_on) {
Thomas Maier83f3aa32007-02-10 01:45:11 -08002594 set_bdi_congested(&q->backing_dev_info, WRITE);
Thomas Maier0a0fc962006-12-08 02:36:11 -08002595 do {
2596 spin_unlock(&pd->lock);
2597 congestion_wait(WRITE, HZ);
2598 spin_lock(&pd->lock);
2599 } while(pd->bio_queue_size > pd->write_congestion_off);
2600 }
2601 spin_unlock(&pd->lock);
2602
Linus Torvalds1da177e2005-04-16 15:20:36 -07002603 /*
2604 * No matching packet found. Store the bio in the work queue.
2605 */
2606 node = mempool_alloc(pd->rb_pool, GFP_NOIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607 node->bio = bio;
2608 spin_lock(&pd->lock);
2609 BUG_ON(pd->bio_queue_size < 0);
2610 was_empty = (pd->bio_queue_size == 0);
2611 pkt_rbtree_insert(pd, node);
2612 spin_unlock(&pd->lock);
2613
2614 /*
2615 * Wake up the worker thread.
2616 */
2617 atomic_set(&pd->scan_queue, 1);
2618 if (was_empty) {
2619 /* This wake_up is required for correct operation */
2620 wake_up(&pd->wqueue);
2621 } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) {
2622 /*
2623 * This wake up is not required for correct operation,
2624 * but improves performance in some cases.
2625 */
2626 wake_up(&pd->wqueue);
2627 }
2628 return 0;
2629end_io:
NeilBrown6712ecf2007-09-27 12:47:43 +02002630 bio_io_error(bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631 return 0;
2632}
2633
2634
2635
Alasdair G Kergoncc371e62008-07-03 09:53:43 +02002636static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd,
2637 struct bio_vec *bvec)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638{
2639 struct pktcdvd_device *pd = q->queuedata;
Alasdair G Kergoncc371e62008-07-03 09:53:43 +02002640 sector_t zone = ZONE(bmd->bi_sector, pd);
2641 int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642 int remaining = (pd->settings.size << 9) - used;
2643 int remaining2;
2644
2645 /*
2646 * A bio <= PAGE_SIZE must be allowed. If it crosses a packet
2647 * boundary, pkt_make_request() will split the bio.
2648 */
Alasdair G Kergoncc371e62008-07-03 09:53:43 +02002649 remaining2 = PAGE_SIZE - bmd->bi_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650 remaining = max(remaining, remaining2);
2651
2652 BUG_ON(remaining < 0);
2653 return remaining;
2654}
2655
2656static void pkt_init_queue(struct pktcdvd_device *pd)
2657{
Jens Axboe165125e2007-07-24 09:28:11 +02002658 struct request_queue *q = pd->disk->queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659
2660 blk_queue_make_request(q, pkt_make_request);
2661 blk_queue_hardsect_size(q, CD_FRAMESIZE);
2662 blk_queue_max_sectors(q, PACKET_MAX_SECTORS);
2663 blk_queue_merge_bvec(q, pkt_merge_bvec);
2664 q->queuedata = pd;
2665}
2666
2667static int pkt_seq_show(struct seq_file *m, void *p)
2668{
2669 struct pktcdvd_device *pd = m->private;
2670 char *msg;
2671 char bdev_buf[BDEVNAME_SIZE];
2672 int states[PACKET_NUM_STATES];
2673
2674 seq_printf(m, "Writer %s mapped to %s:\n", pd->name,
2675 bdevname(pd->bdev, bdev_buf));
2676
2677 seq_printf(m, "\nSettings:\n");
2678 seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
2679
2680 if (pd->settings.write_type == 0)
2681 msg = "Packet";
2682 else
2683 msg = "Unknown";
2684 seq_printf(m, "\twrite type:\t\t%s\n", msg);
2685
2686 seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable");
2687 seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss);
2688
2689 seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode);
2690
2691 if (pd->settings.block_mode == PACKET_BLOCK_MODE1)
2692 msg = "Mode 1";
2693 else if (pd->settings.block_mode == PACKET_BLOCK_MODE2)
2694 msg = "Mode 2";
2695 else
2696 msg = "Unknown";
2697 seq_printf(m, "\tblock mode:\t\t%s\n", msg);
2698
2699 seq_printf(m, "\nStatistics:\n");
2700 seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started);
2701 seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended);
2702 seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1);
2703 seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1);
2704 seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1);
2705
2706 seq_printf(m, "\nMisc:\n");
2707 seq_printf(m, "\treference count:\t%d\n", pd->refcnt);
2708 seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags);
2709 seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed);
2710 seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed);
2711 seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset);
2712 seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset);
2713
2714 seq_printf(m, "\nQueue state:\n");
2715 seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size);
2716 seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios));
2717 seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector);
2718
2719 pkt_count_states(pd, states);
2720 seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n",
2721 states[0], states[1], states[2], states[3], states[4], states[5]);
2722
Thomas Maier0a0fc962006-12-08 02:36:11 -08002723 seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n",
2724 pd->write_congestion_off,
2725 pd->write_congestion_on);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002726 return 0;
2727}
2728
2729static int pkt_seq_open(struct inode *inode, struct file *file)
2730{
2731 return single_open(file, pkt_seq_show, PDE(inode)->data);
2732}
2733
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08002734static const struct file_operations pkt_proc_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002735 .open = pkt_seq_open,
2736 .read = seq_read,
2737 .llseek = seq_lseek,
2738 .release = single_release
2739};
2740
2741static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev)
2742{
2743 int i;
2744 int ret = 0;
2745 char b[BDEVNAME_SIZE];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002746 struct block_device *bdev;
2747
2748 if (pd->pkt_dev == dev) {
Thomas Maier78220822006-10-04 02:15:28 -07002749 printk(DRIVER_NAME": Recursive setup not allowed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002750 return -EBUSY;
2751 }
2752 for (i = 0; i < MAX_WRITERS; i++) {
2753 struct pktcdvd_device *pd2 = pkt_devs[i];
2754 if (!pd2)
2755 continue;
2756 if (pd2->bdev->bd_dev == dev) {
Thomas Maier78220822006-10-04 02:15:28 -07002757 printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 return -EBUSY;
2759 }
2760 if (pd2->pkt_dev == dev) {
Thomas Maier78220822006-10-04 02:15:28 -07002761 printk(DRIVER_NAME": Can't chain pktcdvd devices\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002762 return -EBUSY;
2763 }
2764 }
2765
2766 bdev = bdget(dev);
2767 if (!bdev)
2768 return -ENOMEM;
2769 ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK);
2770 if (ret)
2771 return ret;
2772
2773 /* This is safe, since we have a reference from open(). */
2774 __module_get(THIS_MODULE);
2775
Linus Torvalds1da177e2005-04-16 15:20:36 -07002776 pd->bdev = bdev;
2777 set_blocksize(bdev, CD_FRAMESIZE);
2778
2779 pkt_init_queue(pd);
2780
2781 atomic_set(&pd->cdrw.pending_bios, 0);
2782 pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name);
2783 if (IS_ERR(pd->cdrw.thread)) {
Thomas Maier78220822006-10-04 02:15:28 -07002784 printk(DRIVER_NAME": can't start kernel thread\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002785 ret = -ENOMEM;
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002786 goto out_mem;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002787 }
2788
Denis V. Lunevc7705f32008-04-29 01:02:35 -07002789 proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd);
Thomas Maier78220822006-10-04 02:15:28 -07002790 DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002791 return 0;
2792
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793out_mem:
2794 blkdev_put(bdev);
2795 /* This is safe: open() is still holding a reference. */
2796 module_put(THIS_MODULE);
2797 return ret;
2798}
2799
Linus Torvalds8560c652008-08-27 13:35:31 -07002800static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002801{
Linus Torvalds8560c652008-08-27 13:35:31 -07002802 struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002803
2804 VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002805
2806 switch (cmd) {
2807 /*
2808 * forward selected CDROM ioctls to CD-ROM, for UDF
2809 */
2810 case CDROMMULTISESSION:
2811 case CDROMREADTOCENTRY:
2812 case CDROM_LAST_WRITTEN:
2813 case CDROM_SEND_PACKET:
2814 case SCSI_IOCTL_SEND_COMMAND:
Linus Torvalds8560c652008-08-27 13:35:31 -07002815 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002816
2817 case CDROMEJECT:
2818 /*
2819 * The door gets locked when the device is opened, so we
2820 * have to unlock it or else the eject command fails.
2821 */
Peter Osterlund948423e2006-02-14 13:52:56 -08002822 if (pd->refcnt == 1)
2823 pkt_lock_door(pd, 0);
Linus Torvalds8560c652008-08-27 13:35:31 -07002824 return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002825
2826 default:
Thomas Maier78220822006-10-04 02:15:28 -07002827 VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd);
Linus Torvalds8560c652008-08-27 13:35:31 -07002828 return -ENOTTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829 }
Linus Torvalds8560c652008-08-27 13:35:31 -07002830
2831 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002832}
2833
2834static int pkt_media_changed(struct gendisk *disk)
2835{
2836 struct pktcdvd_device *pd = disk->private_data;
2837 struct gendisk *attached_disk;
2838
2839 if (!pd)
2840 return 0;
2841 if (!pd->bdev)
2842 return 0;
2843 attached_disk = pd->bdev->bd_disk;
2844 if (!attached_disk)
2845 return 0;
2846 return attached_disk->fops->media_changed(attached_disk);
2847}
2848
2849static struct block_device_operations pktcdvd_ops = {
2850 .owner = THIS_MODULE,
2851 .open = pkt_open,
2852 .release = pkt_close,
Linus Torvalds8560c652008-08-27 13:35:31 -07002853 .ioctl = pkt_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002854 .media_changed = pkt_media_changed,
2855};
2856
2857/*
2858 * Set up mapping from pktcdvd device to CD-ROM device.
2859 */
Thomas Maieradb92502006-12-08 02:36:10 -08002860static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861{
2862 int idx;
2863 int ret = -ENOMEM;
2864 struct pktcdvd_device *pd;
2865 struct gendisk *disk;
Thomas Maieradb92502006-12-08 02:36:10 -08002866
2867 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868
2869 for (idx = 0; idx < MAX_WRITERS; idx++)
2870 if (!pkt_devs[idx])
2871 break;
2872 if (idx == MAX_WRITERS) {
Thomas Maier78220822006-10-04 02:15:28 -07002873 printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS);
Thomas Maieradb92502006-12-08 02:36:10 -08002874 ret = -EBUSY;
2875 goto out_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876 }
2877
Peter Osterlund1107d2e2005-09-13 01:25:29 -07002878 pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002879 if (!pd)
Thomas Maieradb92502006-12-08 02:36:10 -08002880 goto out_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002881
Matthew Dobson0eaae62a2006-03-26 01:37:47 -08002882 pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE,
2883 sizeof(struct pkt_rb_node));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884 if (!pd->rb_pool)
2885 goto out_mem;
2886
Peter Osterlunde1bc89b2006-02-04 23:27:47 -08002887 INIT_LIST_HEAD(&pd->cdrw.pkt_free_list);
2888 INIT_LIST_HEAD(&pd->cdrw.pkt_active_list);
2889 spin_lock_init(&pd->cdrw.active_list_lock);
2890
Linus Torvalds1da177e2005-04-16 15:20:36 -07002891 spin_lock_init(&pd->lock);
2892 spin_lock_init(&pd->iosched.lock);
Thomas Maier78220822006-10-04 02:15:28 -07002893 sprintf(pd->name, DRIVER_NAME"%d", idx);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894 init_waitqueue_head(&pd->wqueue);
2895 pd->bio_queue = RB_ROOT;
2896
Thomas Maier0a0fc962006-12-08 02:36:11 -08002897 pd->write_congestion_on = write_congestion_on;
2898 pd->write_congestion_off = write_congestion_off;
2899
Thomas Maieradb92502006-12-08 02:36:10 -08002900 disk = alloc_disk(1);
2901 if (!disk)
2902 goto out_mem;
2903 pd->disk = disk;
Thomas Maieradd21662006-10-04 02:15:30 -07002904 disk->major = pktdev_major;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002905 disk->first_minor = idx;
2906 disk->fops = &pktcdvd_ops;
2907 disk->flags = GENHD_FL_REMOVABLE;
Thomas Maieradb92502006-12-08 02:36:10 -08002908 strcpy(disk->disk_name, pd->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002909 disk->private_data = pd;
2910 disk->queue = blk_alloc_queue(GFP_KERNEL);
2911 if (!disk->queue)
2912 goto out_mem2;
2913
2914 pd->pkt_dev = MKDEV(disk->major, disk->first_minor);
2915 ret = pkt_new_dev(pd, dev);
2916 if (ret)
2917 goto out_new_dev;
2918
2919 add_disk(disk);
Thomas Maieradb92502006-12-08 02:36:10 -08002920
Thomas Maier32694852006-12-08 02:36:12 -08002921 pkt_sysfs_dev_new(pd);
2922 pkt_debugfs_dev_new(pd);
2923
Linus Torvalds1da177e2005-04-16 15:20:36 -07002924 pkt_devs[idx] = pd;
Thomas Maieradb92502006-12-08 02:36:10 -08002925 if (pkt_dev)
2926 *pkt_dev = pd->pkt_dev;
2927
2928 mutex_unlock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929 return 0;
2930
2931out_new_dev:
Al Viro1312f402006-03-12 11:02:03 -05002932 blk_cleanup_queue(disk->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002933out_mem2:
2934 put_disk(disk);
2935out_mem:
2936 if (pd->rb_pool)
2937 mempool_destroy(pd->rb_pool);
2938 kfree(pd);
Thomas Maieradb92502006-12-08 02:36:10 -08002939out_mutex:
2940 mutex_unlock(&ctl_mutex);
2941 printk(DRIVER_NAME": setup of pktcdvd device failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942 return ret;
2943}
2944
2945/*
2946 * Tear down mapping from pktcdvd device to CD-ROM device.
2947 */
Thomas Maieradb92502006-12-08 02:36:10 -08002948static int pkt_remove_dev(dev_t pkt_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002949{
2950 struct pktcdvd_device *pd;
2951 int idx;
Thomas Maieradb92502006-12-08 02:36:10 -08002952 int ret = 0;
2953
2954 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955
2956 for (idx = 0; idx < MAX_WRITERS; idx++) {
2957 pd = pkt_devs[idx];
2958 if (pd && (pd->pkt_dev == pkt_dev))
2959 break;
2960 }
2961 if (idx == MAX_WRITERS) {
Thomas Maier78220822006-10-04 02:15:28 -07002962 DPRINTK(DRIVER_NAME": dev not setup\n");
Thomas Maieradb92502006-12-08 02:36:10 -08002963 ret = -ENXIO;
2964 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965 }
2966
Thomas Maieradb92502006-12-08 02:36:10 -08002967 if (pd->refcnt > 0) {
2968 ret = -EBUSY;
2969 goto out;
2970 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971 if (!IS_ERR(pd->cdrw.thread))
2972 kthread_stop(pd->cdrw.thread);
2973
Thomas Maier32694852006-12-08 02:36:12 -08002974 pkt_devs[idx] = NULL;
2975
2976 pkt_debugfs_dev_remove(pd);
2977 pkt_sysfs_dev_remove(pd);
2978
Linus Torvalds1da177e2005-04-16 15:20:36 -07002979 blkdev_put(pd->bdev);
2980
Linus Torvalds1da177e2005-04-16 15:20:36 -07002981 remove_proc_entry(pd->name, pkt_proc);
Thomas Maier78220822006-10-04 02:15:28 -07002982 DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983
2984 del_gendisk(pd->disk);
Al Viro1312f402006-03-12 11:02:03 -05002985 blk_cleanup_queue(pd->disk->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986 put_disk(pd->disk);
2987
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988 mempool_destroy(pd->rb_pool);
2989 kfree(pd);
2990
2991 /* This is safe: open() is still holding a reference. */
2992 module_put(THIS_MODULE);
Thomas Maieradb92502006-12-08 02:36:10 -08002993
2994out:
2995 mutex_unlock(&ctl_mutex);
2996 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002997}
2998
2999static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd)
3000{
Thomas Maieradb92502006-12-08 02:36:10 -08003001 struct pktcdvd_device *pd;
3002
3003 mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
3004
3005 pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003006 if (pd) {
3007 ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
3008 ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
3009 } else {
3010 ctrl_cmd->dev = 0;
3011 ctrl_cmd->pkt_dev = 0;
3012 }
3013 ctrl_cmd->num_devices = MAX_WRITERS;
Thomas Maieradb92502006-12-08 02:36:10 -08003014
3015 mutex_unlock(&ctl_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003016}
3017
Linus Torvalds8560c652008-08-27 13:35:31 -07003018static int pkt_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003019{
3020 void __user *argp = (void __user *)arg;
3021 struct pkt_ctrl_command ctrl_cmd;
3022 int ret = 0;
Thomas Maieradb92502006-12-08 02:36:10 -08003023 dev_t pkt_dev = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024
3025 if (cmd != PACKET_CTRL_CMD)
3026 return -ENOTTY;
3027
3028 if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command)))
3029 return -EFAULT;
3030
3031 switch (ctrl_cmd.command) {
3032 case PKT_CTRL_CMD_SETUP:
3033 if (!capable(CAP_SYS_ADMIN))
3034 return -EPERM;
Thomas Maieradb92502006-12-08 02:36:10 -08003035 ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev);
3036 ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037 break;
3038 case PKT_CTRL_CMD_TEARDOWN:
3039 if (!capable(CAP_SYS_ADMIN))
3040 return -EPERM;
Thomas Maieradb92502006-12-08 02:36:10 -08003041 ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003042 break;
3043 case PKT_CTRL_CMD_STATUS:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003044 pkt_get_status(&ctrl_cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003045 break;
3046 default:
3047 return -ENOTTY;
3048 }
3049
3050 if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command)))
3051 return -EFAULT;
3052 return ret;
3053}
3054
3055
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08003056static const struct file_operations pkt_ctl_fops = {
Linus Torvalds8560c652008-08-27 13:35:31 -07003057 .ioctl = pkt_ctl_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003058 .owner = THIS_MODULE,
3059};
3060
3061static struct miscdevice pkt_misc = {
3062 .minor = MISC_DYNAMIC_MINOR,
Thomas Maier78220822006-10-04 02:15:28 -07003063 .name = DRIVER_NAME,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003064 .fops = &pkt_ctl_fops
3065};
3066
3067static int __init pkt_init(void)
3068{
3069 int ret;
3070
Thomas Maier32694852006-12-08 02:36:12 -08003071 mutex_init(&ctl_mutex);
3072
Matthew Dobson0eaae62a2006-03-26 01:37:47 -08003073 psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE,
3074 sizeof(struct packet_stacked_data));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075 if (!psd_pool)
3076 return -ENOMEM;
3077
Thomas Maieradd21662006-10-04 02:15:30 -07003078 ret = register_blkdev(pktdev_major, DRIVER_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003079 if (ret < 0) {
Thomas Maier78220822006-10-04 02:15:28 -07003080 printk(DRIVER_NAME": Unable to register block device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003081 goto out2;
3082 }
Thomas Maieradd21662006-10-04 02:15:30 -07003083 if (!pktdev_major)
3084 pktdev_major = ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003085
Thomas Maier32694852006-12-08 02:36:12 -08003086 ret = pkt_sysfs_init();
3087 if (ret)
3088 goto out;
3089
3090 pkt_debugfs_init();
3091
Linus Torvalds1da177e2005-04-16 15:20:36 -07003092 ret = misc_register(&pkt_misc);
3093 if (ret) {
Thomas Maier78220822006-10-04 02:15:28 -07003094 printk(DRIVER_NAME": Unable to register misc device\n");
Thomas Maier32694852006-12-08 02:36:12 -08003095 goto out_misc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003096 }
3097
Alexey Dobriyan928b4d82008-04-29 01:01:44 -07003098 pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003099
Linus Torvalds1da177e2005-04-16 15:20:36 -07003100 return 0;
3101
Thomas Maier32694852006-12-08 02:36:12 -08003102out_misc:
3103 pkt_debugfs_cleanup();
3104 pkt_sysfs_cleanup();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105out:
Thomas Maieradd21662006-10-04 02:15:30 -07003106 unregister_blkdev(pktdev_major, DRIVER_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003107out2:
3108 mempool_destroy(psd_pool);
3109 return ret;
3110}
3111
3112static void __exit pkt_exit(void)
3113{
Alexey Dobriyan928b4d82008-04-29 01:01:44 -07003114 remove_proc_entry("driver/"DRIVER_NAME, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003115 misc_deregister(&pkt_misc);
Thomas Maier32694852006-12-08 02:36:12 -08003116
3117 pkt_debugfs_cleanup();
3118 pkt_sysfs_cleanup();
3119
Thomas Maieradd21662006-10-04 02:15:30 -07003120 unregister_blkdev(pktdev_major, DRIVER_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003121 mempool_destroy(psd_pool);
3122}
3123
3124MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives");
3125MODULE_AUTHOR("Jens Axboe <axboe@suse.de>");
3126MODULE_LICENSE("GPL");
3127
3128module_init(pkt_init);
3129module_exit(pkt_exit);