Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2000 Jens Axboe <axboe@suse.de> |
| 3 | * Copyright (C) 2001-2004 Peter Osterlund <petero2@telia.com> |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 4 | * Copyright (C) 2006 Thomas Maier <balagi@justmail.de> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * May be copied or modified under the terms of the GNU General Public |
| 7 | * License. See linux/COPYING for more information. |
| 8 | * |
Peter Osterlund | a676f8d | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 9 | * Packet writing layer for ATAPI and SCSI CD-RW, DVD+RW, DVD-RW and |
| 10 | * DVD-RAM devices. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * Theory of operation: |
| 13 | * |
Peter Osterlund | a676f8d | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 14 | * At the lowest level, there is the standard driver for the CD/DVD device, |
| 15 | * typically ide-cd.c or sr.c. This driver can handle read and write requests, |
| 16 | * but it doesn't know anything about the special restrictions that apply to |
| 17 | * packet writing. One restriction is that write requests must be aligned to |
| 18 | * packet boundaries on the physical media, and the size of a write request |
| 19 | * must be equal to the packet size. Another restriction is that a |
| 20 | * GPCMD_FLUSH_CACHE command has to be issued to the drive before a read |
| 21 | * command, if the previous command was a write. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | * |
Peter Osterlund | a676f8d | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 23 | * The purpose of the packet writing driver is to hide these restrictions from |
| 24 | * higher layers, such as file systems, and present a block device that can be |
| 25 | * randomly read and written using 2kB-sized blocks. |
| 26 | * |
| 27 | * The lowest layer in the packet writing driver is the packet I/O scheduler. |
| 28 | * Its data is defined by the struct packet_iosched and includes two bio |
| 29 | * queues with pending read and write requests. These queues are processed |
| 30 | * by the pkt_iosched_process_queue() function. The write requests in this |
| 31 | * queue are already properly aligned and sized. This layer is responsible for |
| 32 | * issuing the flush cache commands and scheduling the I/O in a good order. |
| 33 | * |
| 34 | * The next layer transforms unaligned write requests to aligned writes. This |
| 35 | * transformation requires reading missing pieces of data from the underlying |
| 36 | * block device, assembling the pieces to full packets and queuing them to the |
| 37 | * packet I/O scheduler. |
| 38 | * |
| 39 | * At the top layer there is a custom make_request_fn function that forwards |
| 40 | * read requests directly to the iosched queue and puts write requests in the |
| 41 | * unaligned write queue. A kernel thread performs the necessary read |
| 42 | * gathering to convert the unaligned writes to aligned writes and then feeds |
| 43 | * them to the packet I/O scheduler. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | * |
| 45 | *************************************************************************/ |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/pktcdvd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/module.h> |
| 49 | #include <linux/types.h> |
| 50 | #include <linux/kernel.h> |
| 51 | #include <linux/kthread.h> |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 52 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <linux/errno.h> |
| 54 | #include <linux/spinlock.h> |
| 55 | #include <linux/file.h> |
| 56 | #include <linux/proc_fs.h> |
| 57 | #include <linux/seq_file.h> |
| 58 | #include <linux/miscdevice.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 59 | #include <linux/freezer.h> |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 60 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <scsi/scsi_cmnd.h> |
| 62 | #include <scsi/scsi_ioctl.h> |
Peter Osterlund | cef28963 | 2006-02-20 18:28:01 -0800 | [diff] [blame] | 63 | #include <scsi/scsi.h> |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 64 | #include <linux/debugfs.h> |
| 65 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | #include <asm/uaccess.h> |
| 68 | |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 69 | #define DRIVER_NAME "pktcdvd" |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #if PACKET_DEBUG |
| 72 | #define DPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) |
| 73 | #else |
| 74 | #define DPRINTK(fmt, args...) |
| 75 | #endif |
| 76 | |
| 77 | #if PACKET_DEBUG > 1 |
| 78 | #define VPRINTK(fmt, args...) printk(KERN_NOTICE fmt, ##args) |
| 79 | #else |
| 80 | #define VPRINTK(fmt, args...) |
| 81 | #endif |
| 82 | |
| 83 | #define MAX_SPEED 0xffff |
| 84 | |
| 85 | #define ZONE(sector, pd) (((sector) + (pd)->offset) & ~((pd)->settings.size - 1)) |
| 86 | |
| 87 | static struct pktcdvd_device *pkt_devs[MAX_WRITERS]; |
| 88 | static struct proc_dir_entry *pkt_proc; |
Thomas Maier | add2166 | 2006-10-04 02:15:30 -0700 | [diff] [blame] | 89 | static int pktdev_major; |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 90 | static int write_congestion_on = PKT_WRITE_CONGESTION_ON; |
| 91 | static int write_congestion_off = PKT_WRITE_CONGESTION_OFF; |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 92 | static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | static mempool_t *psd_pool; |
| 94 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 95 | static struct class *class_pktcdvd = NULL; /* /sys/class/pktcdvd */ |
| 96 | static struct dentry *pkt_debugfs_root = NULL; /* /debug/pktcdvd */ |
| 97 | |
| 98 | /* forward declaration */ |
| 99 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev); |
| 100 | static int pkt_remove_dev(dev_t pkt_dev); |
| 101 | static int pkt_seq_show(struct seq_file *m, void *p); |
| 102 | |
| 103 | |
| 104 | |
| 105 | /* |
| 106 | * create and register a pktcdvd kernel object. |
| 107 | */ |
| 108 | static struct pktcdvd_kobj* pkt_kobj_create(struct pktcdvd_device *pd, |
| 109 | const char* name, |
| 110 | struct kobject* parent, |
| 111 | struct kobj_type* ktype) |
| 112 | { |
| 113 | struct pktcdvd_kobj *p; |
Greg Kroah-Hartman | 89c4260 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 114 | int error; |
| 115 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 116 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
| 117 | if (!p) |
| 118 | return NULL; |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 119 | p->pd = pd; |
Greg Kroah-Hartman | 89c4260 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 120 | error = kobject_init_and_add(&p->kobj, ktype, parent, "%s", name); |
| 121 | if (error) { |
Dave Young | d17a18d | 2007-12-17 16:20:00 -0800 | [diff] [blame] | 122 | kobject_put(&p->kobj); |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 123 | return NULL; |
Dave Young | d17a18d | 2007-12-17 16:20:00 -0800 | [diff] [blame] | 124 | } |
Greg Kroah-Hartman | 89c4260 | 2007-12-17 15:54:39 -0400 | [diff] [blame] | 125 | kobject_uevent(&p->kobj, KOBJ_ADD); |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 126 | return p; |
| 127 | } |
| 128 | /* |
| 129 | * remove a pktcdvd kernel object. |
| 130 | */ |
| 131 | static void pkt_kobj_remove(struct pktcdvd_kobj *p) |
| 132 | { |
| 133 | if (p) |
Greg Kroah-Hartman | c10997f | 2007-12-20 08:13:05 -0800 | [diff] [blame] | 134 | kobject_put(&p->kobj); |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 135 | } |
| 136 | /* |
| 137 | * default release function for pktcdvd kernel objects. |
| 138 | */ |
| 139 | static void pkt_kobj_release(struct kobject *kobj) |
| 140 | { |
| 141 | kfree(to_pktcdvdkobj(kobj)); |
| 142 | } |
| 143 | |
| 144 | |
| 145 | /********************************************************** |
| 146 | * |
| 147 | * sysfs interface for pktcdvd |
| 148 | * by (C) 2006 Thomas Maier <balagi@justmail.de> |
| 149 | * |
| 150 | **********************************************************/ |
| 151 | |
| 152 | #define DEF_ATTR(_obj,_name,_mode) \ |
Tejun Heo | 7b59575 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 153 | static struct attribute _obj = { .name = _name, .mode = _mode } |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 154 | |
| 155 | /********************************************************** |
| 156 | /sys/class/pktcdvd/pktcdvd[0-7]/ |
| 157 | stat/reset |
| 158 | stat/packets_started |
| 159 | stat/packets_finished |
| 160 | stat/kb_written |
| 161 | stat/kb_read |
| 162 | stat/kb_read_gather |
| 163 | write_queue/size |
| 164 | write_queue/congestion_off |
| 165 | write_queue/congestion_on |
| 166 | **********************************************************/ |
| 167 | |
| 168 | DEF_ATTR(kobj_pkt_attr_st1, "reset", 0200); |
| 169 | DEF_ATTR(kobj_pkt_attr_st2, "packets_started", 0444); |
| 170 | DEF_ATTR(kobj_pkt_attr_st3, "packets_finished", 0444); |
| 171 | DEF_ATTR(kobj_pkt_attr_st4, "kb_written", 0444); |
| 172 | DEF_ATTR(kobj_pkt_attr_st5, "kb_read", 0444); |
| 173 | DEF_ATTR(kobj_pkt_attr_st6, "kb_read_gather", 0444); |
| 174 | |
| 175 | static struct attribute *kobj_pkt_attrs_stat[] = { |
| 176 | &kobj_pkt_attr_st1, |
| 177 | &kobj_pkt_attr_st2, |
| 178 | &kobj_pkt_attr_st3, |
| 179 | &kobj_pkt_attr_st4, |
| 180 | &kobj_pkt_attr_st5, |
| 181 | &kobj_pkt_attr_st6, |
| 182 | NULL |
| 183 | }; |
| 184 | |
| 185 | DEF_ATTR(kobj_pkt_attr_wq1, "size", 0444); |
| 186 | DEF_ATTR(kobj_pkt_attr_wq2, "congestion_off", 0644); |
| 187 | DEF_ATTR(kobj_pkt_attr_wq3, "congestion_on", 0644); |
| 188 | |
| 189 | static struct attribute *kobj_pkt_attrs_wqueue[] = { |
| 190 | &kobj_pkt_attr_wq1, |
| 191 | &kobj_pkt_attr_wq2, |
| 192 | &kobj_pkt_attr_wq3, |
| 193 | NULL |
| 194 | }; |
| 195 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 196 | static ssize_t kobj_pkt_show(struct kobject *kobj, |
| 197 | struct attribute *attr, char *data) |
| 198 | { |
| 199 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
| 200 | int n = 0; |
| 201 | int v; |
| 202 | if (strcmp(attr->name, "packets_started") == 0) { |
| 203 | n = sprintf(data, "%lu\n", pd->stats.pkt_started); |
| 204 | |
| 205 | } else if (strcmp(attr->name, "packets_finished") == 0) { |
| 206 | n = sprintf(data, "%lu\n", pd->stats.pkt_ended); |
| 207 | |
| 208 | } else if (strcmp(attr->name, "kb_written") == 0) { |
| 209 | n = sprintf(data, "%lu\n", pd->stats.secs_w >> 1); |
| 210 | |
| 211 | } else if (strcmp(attr->name, "kb_read") == 0) { |
| 212 | n = sprintf(data, "%lu\n", pd->stats.secs_r >> 1); |
| 213 | |
| 214 | } else if (strcmp(attr->name, "kb_read_gather") == 0) { |
| 215 | n = sprintf(data, "%lu\n", pd->stats.secs_rg >> 1); |
| 216 | |
| 217 | } else if (strcmp(attr->name, "size") == 0) { |
| 218 | spin_lock(&pd->lock); |
| 219 | v = pd->bio_queue_size; |
| 220 | spin_unlock(&pd->lock); |
| 221 | n = sprintf(data, "%d\n", v); |
| 222 | |
| 223 | } else if (strcmp(attr->name, "congestion_off") == 0) { |
| 224 | spin_lock(&pd->lock); |
| 225 | v = pd->write_congestion_off; |
| 226 | spin_unlock(&pd->lock); |
| 227 | n = sprintf(data, "%d\n", v); |
| 228 | |
| 229 | } else if (strcmp(attr->name, "congestion_on") == 0) { |
| 230 | spin_lock(&pd->lock); |
| 231 | v = pd->write_congestion_on; |
| 232 | spin_unlock(&pd->lock); |
| 233 | n = sprintf(data, "%d\n", v); |
| 234 | } |
| 235 | return n; |
| 236 | } |
| 237 | |
| 238 | static void init_write_congestion_marks(int* lo, int* hi) |
| 239 | { |
| 240 | if (*hi > 0) { |
| 241 | *hi = max(*hi, 500); |
| 242 | *hi = min(*hi, 1000000); |
| 243 | if (*lo <= 0) |
| 244 | *lo = *hi - 100; |
| 245 | else { |
| 246 | *lo = min(*lo, *hi - 100); |
| 247 | *lo = max(*lo, 100); |
| 248 | } |
| 249 | } else { |
| 250 | *hi = -1; |
| 251 | *lo = -1; |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | static ssize_t kobj_pkt_store(struct kobject *kobj, |
| 256 | struct attribute *attr, |
| 257 | const char *data, size_t len) |
| 258 | { |
| 259 | struct pktcdvd_device *pd = to_pktcdvdkobj(kobj)->pd; |
| 260 | int val; |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 261 | |
Thomas Maier | 83f3aa3 | 2007-02-10 01:45:11 -0800 | [diff] [blame] | 262 | if (strcmp(attr->name, "reset") == 0 && len > 0) { |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 263 | pd->stats.pkt_started = 0; |
| 264 | pd->stats.pkt_ended = 0; |
| 265 | pd->stats.secs_w = 0; |
| 266 | pd->stats.secs_rg = 0; |
| 267 | pd->stats.secs_r = 0; |
| 268 | |
| 269 | } else if (strcmp(attr->name, "congestion_off") == 0 |
Thomas Maier | 83f3aa3 | 2007-02-10 01:45:11 -0800 | [diff] [blame] | 270 | && sscanf(data, "%d", &val) == 1) { |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 271 | spin_lock(&pd->lock); |
| 272 | pd->write_congestion_off = val; |
| 273 | init_write_congestion_marks(&pd->write_congestion_off, |
| 274 | &pd->write_congestion_on); |
| 275 | spin_unlock(&pd->lock); |
| 276 | |
| 277 | } else if (strcmp(attr->name, "congestion_on") == 0 |
Thomas Maier | 83f3aa3 | 2007-02-10 01:45:11 -0800 | [diff] [blame] | 278 | && sscanf(data, "%d", &val) == 1) { |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 279 | spin_lock(&pd->lock); |
| 280 | pd->write_congestion_on = val; |
| 281 | init_write_congestion_marks(&pd->write_congestion_off, |
| 282 | &pd->write_congestion_on); |
| 283 | spin_unlock(&pd->lock); |
| 284 | } |
| 285 | return len; |
| 286 | } |
| 287 | |
| 288 | static struct sysfs_ops kobj_pkt_ops = { |
| 289 | .show = kobj_pkt_show, |
| 290 | .store = kobj_pkt_store |
| 291 | }; |
| 292 | static struct kobj_type kobj_pkt_type_stat = { |
| 293 | .release = pkt_kobj_release, |
| 294 | .sysfs_ops = &kobj_pkt_ops, |
| 295 | .default_attrs = kobj_pkt_attrs_stat |
| 296 | }; |
| 297 | static struct kobj_type kobj_pkt_type_wqueue = { |
| 298 | .release = pkt_kobj_release, |
| 299 | .sysfs_ops = &kobj_pkt_ops, |
| 300 | .default_attrs = kobj_pkt_attrs_wqueue |
| 301 | }; |
| 302 | |
| 303 | static void pkt_sysfs_dev_new(struct pktcdvd_device *pd) |
| 304 | { |
| 305 | if (class_pktcdvd) { |
Greg Kroah-Hartman | f79f060 | 2008-05-21 12:52:33 -0700 | [diff] [blame] | 306 | pd->dev = device_create_drvdata(class_pktcdvd, NULL, |
| 307 | pd->pkt_dev, NULL, |
| 308 | "%s", pd->name); |
Tony Jones | 6013c12 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 309 | if (IS_ERR(pd->dev)) |
| 310 | pd->dev = NULL; |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 311 | } |
Tony Jones | 6013c12 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 312 | if (pd->dev) { |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 313 | pd->kobj_stat = pkt_kobj_create(pd, "stat", |
Tony Jones | 6013c12 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 314 | &pd->dev->kobj, |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 315 | &kobj_pkt_type_stat); |
| 316 | pd->kobj_wqueue = pkt_kobj_create(pd, "write_queue", |
Tony Jones | 6013c12 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 317 | &pd->dev->kobj, |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 318 | &kobj_pkt_type_wqueue); |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | static void pkt_sysfs_dev_remove(struct pktcdvd_device *pd) |
| 323 | { |
| 324 | pkt_kobj_remove(pd->kobj_stat); |
| 325 | pkt_kobj_remove(pd->kobj_wqueue); |
| 326 | if (class_pktcdvd) |
Tony Jones | 6013c12 | 2007-09-25 02:03:03 +0200 | [diff] [blame] | 327 | device_destroy(class_pktcdvd, pd->pkt_dev); |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | |
| 331 | /******************************************************************** |
| 332 | /sys/class/pktcdvd/ |
| 333 | add map block device |
| 334 | remove unmap packet dev |
| 335 | device_map show mappings |
| 336 | *******************************************************************/ |
| 337 | |
| 338 | static void class_pktcdvd_release(struct class *cls) |
| 339 | { |
| 340 | kfree(cls); |
| 341 | } |
| 342 | static ssize_t class_pktcdvd_show_map(struct class *c, char *data) |
| 343 | { |
| 344 | int n = 0; |
| 345 | int idx; |
| 346 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 347 | for (idx = 0; idx < MAX_WRITERS; idx++) { |
| 348 | struct pktcdvd_device *pd = pkt_devs[idx]; |
| 349 | if (!pd) |
| 350 | continue; |
| 351 | n += sprintf(data+n, "%s %u:%u %u:%u\n", |
| 352 | pd->name, |
| 353 | MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev), |
| 354 | MAJOR(pd->bdev->bd_dev), |
| 355 | MINOR(pd->bdev->bd_dev)); |
| 356 | } |
| 357 | mutex_unlock(&ctl_mutex); |
| 358 | return n; |
| 359 | } |
| 360 | |
| 361 | static ssize_t class_pktcdvd_store_add(struct class *c, const char *buf, |
| 362 | size_t count) |
| 363 | { |
| 364 | unsigned int major, minor; |
Tejun Heo | fffe487 | 2007-11-08 08:00:24 +0100 | [diff] [blame] | 365 | |
Thomas Maier | 83f3aa3 | 2007-02-10 01:45:11 -0800 | [diff] [blame] | 366 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
Tejun Heo | fffe487 | 2007-11-08 08:00:24 +0100 | [diff] [blame] | 367 | /* pkt_setup_dev() expects caller to hold reference to self */ |
| 368 | if (!try_module_get(THIS_MODULE)) |
| 369 | return -ENODEV; |
| 370 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 371 | pkt_setup_dev(MKDEV(major, minor), NULL); |
Tejun Heo | fffe487 | 2007-11-08 08:00:24 +0100 | [diff] [blame] | 372 | |
| 373 | module_put(THIS_MODULE); |
| 374 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 375 | return count; |
| 376 | } |
Tejun Heo | fffe487 | 2007-11-08 08:00:24 +0100 | [diff] [blame] | 377 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 378 | return -EINVAL; |
| 379 | } |
| 380 | |
| 381 | static ssize_t class_pktcdvd_store_remove(struct class *c, const char *buf, |
| 382 | size_t count) |
| 383 | { |
| 384 | unsigned int major, minor; |
Thomas Maier | 83f3aa3 | 2007-02-10 01:45:11 -0800 | [diff] [blame] | 385 | if (sscanf(buf, "%u:%u", &major, &minor) == 2) { |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 386 | pkt_remove_dev(MKDEV(major, minor)); |
| 387 | return count; |
| 388 | } |
| 389 | return -EINVAL; |
| 390 | } |
| 391 | |
| 392 | static struct class_attribute class_pktcdvd_attrs[] = { |
| 393 | __ATTR(add, 0200, NULL, class_pktcdvd_store_add), |
| 394 | __ATTR(remove, 0200, NULL, class_pktcdvd_store_remove), |
| 395 | __ATTR(device_map, 0444, class_pktcdvd_show_map, NULL), |
| 396 | __ATTR_NULL |
| 397 | }; |
| 398 | |
| 399 | |
| 400 | static int pkt_sysfs_init(void) |
| 401 | { |
| 402 | int ret = 0; |
| 403 | |
| 404 | /* |
| 405 | * create control files in sysfs |
| 406 | * /sys/class/pktcdvd/... |
| 407 | */ |
| 408 | class_pktcdvd = kzalloc(sizeof(*class_pktcdvd), GFP_KERNEL); |
| 409 | if (!class_pktcdvd) |
| 410 | return -ENOMEM; |
| 411 | class_pktcdvd->name = DRIVER_NAME; |
| 412 | class_pktcdvd->owner = THIS_MODULE; |
| 413 | class_pktcdvd->class_release = class_pktcdvd_release; |
| 414 | class_pktcdvd->class_attrs = class_pktcdvd_attrs; |
| 415 | ret = class_register(class_pktcdvd); |
| 416 | if (ret) { |
| 417 | kfree(class_pktcdvd); |
| 418 | class_pktcdvd = NULL; |
| 419 | printk(DRIVER_NAME": failed to create class pktcdvd\n"); |
| 420 | return ret; |
| 421 | } |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static void pkt_sysfs_cleanup(void) |
| 426 | { |
| 427 | if (class_pktcdvd) |
| 428 | class_destroy(class_pktcdvd); |
| 429 | class_pktcdvd = NULL; |
| 430 | } |
| 431 | |
| 432 | /******************************************************************** |
| 433 | entries in debugfs |
| 434 | |
| 435 | /debugfs/pktcdvd[0-7]/ |
| 436 | info |
| 437 | |
| 438 | *******************************************************************/ |
| 439 | |
| 440 | static int pkt_debugfs_seq_show(struct seq_file *m, void *p) |
| 441 | { |
| 442 | return pkt_seq_show(m, p); |
| 443 | } |
| 444 | |
| 445 | static int pkt_debugfs_fops_open(struct inode *inode, struct file *file) |
| 446 | { |
| 447 | return single_open(file, pkt_debugfs_seq_show, inode->i_private); |
| 448 | } |
| 449 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 450 | static const struct file_operations debug_fops = { |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 451 | .open = pkt_debugfs_fops_open, |
| 452 | .read = seq_read, |
| 453 | .llseek = seq_lseek, |
| 454 | .release = single_release, |
| 455 | .owner = THIS_MODULE, |
| 456 | }; |
| 457 | |
| 458 | static void pkt_debugfs_dev_new(struct pktcdvd_device *pd) |
| 459 | { |
| 460 | if (!pkt_debugfs_root) |
| 461 | return; |
| 462 | pd->dfs_f_info = NULL; |
| 463 | pd->dfs_d_root = debugfs_create_dir(pd->name, pkt_debugfs_root); |
| 464 | if (IS_ERR(pd->dfs_d_root)) { |
| 465 | pd->dfs_d_root = NULL; |
| 466 | return; |
| 467 | } |
| 468 | pd->dfs_f_info = debugfs_create_file("info", S_IRUGO, |
| 469 | pd->dfs_d_root, pd, &debug_fops); |
| 470 | if (IS_ERR(pd->dfs_f_info)) { |
| 471 | pd->dfs_f_info = NULL; |
| 472 | return; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | static void pkt_debugfs_dev_remove(struct pktcdvd_device *pd) |
| 477 | { |
| 478 | if (!pkt_debugfs_root) |
| 479 | return; |
| 480 | if (pd->dfs_f_info) |
| 481 | debugfs_remove(pd->dfs_f_info); |
| 482 | pd->dfs_f_info = NULL; |
| 483 | if (pd->dfs_d_root) |
| 484 | debugfs_remove(pd->dfs_d_root); |
| 485 | pd->dfs_d_root = NULL; |
| 486 | } |
| 487 | |
| 488 | static void pkt_debugfs_init(void) |
| 489 | { |
| 490 | pkt_debugfs_root = debugfs_create_dir(DRIVER_NAME, NULL); |
| 491 | if (IS_ERR(pkt_debugfs_root)) { |
| 492 | pkt_debugfs_root = NULL; |
| 493 | return; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | static void pkt_debugfs_cleanup(void) |
| 498 | { |
| 499 | if (!pkt_debugfs_root) |
| 500 | return; |
| 501 | debugfs_remove(pkt_debugfs_root); |
| 502 | pkt_debugfs_root = NULL; |
| 503 | } |
| 504 | |
| 505 | /* ----------------------------------------------------------*/ |
| 506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
| 508 | static void pkt_bio_finished(struct pktcdvd_device *pd) |
| 509 | { |
| 510 | BUG_ON(atomic_read(&pd->cdrw.pending_bios) <= 0); |
| 511 | if (atomic_dec_and_test(&pd->cdrw.pending_bios)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 512 | VPRINTK(DRIVER_NAME": queue empty\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | atomic_set(&pd->iosched.attention, 1); |
| 514 | wake_up(&pd->wqueue); |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | static void pkt_bio_destructor(struct bio *bio) |
| 519 | { |
| 520 | kfree(bio->bi_io_vec); |
| 521 | kfree(bio); |
| 522 | } |
| 523 | |
| 524 | static struct bio *pkt_bio_alloc(int nr_iovecs) |
| 525 | { |
| 526 | struct bio_vec *bvl = NULL; |
| 527 | struct bio *bio; |
| 528 | |
| 529 | bio = kmalloc(sizeof(struct bio), GFP_KERNEL); |
| 530 | if (!bio) |
| 531 | goto no_bio; |
| 532 | bio_init(bio); |
| 533 | |
Peter Osterlund | 1107d2e | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 534 | bvl = kcalloc(nr_iovecs, sizeof(struct bio_vec), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | if (!bvl) |
| 536 | goto no_bvl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | bio->bi_max_vecs = nr_iovecs; |
| 539 | bio->bi_io_vec = bvl; |
| 540 | bio->bi_destructor = pkt_bio_destructor; |
| 541 | |
| 542 | return bio; |
| 543 | |
| 544 | no_bvl: |
| 545 | kfree(bio); |
| 546 | no_bio: |
| 547 | return NULL; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * Allocate a packet_data struct |
| 552 | */ |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 553 | static struct packet_data *pkt_alloc_packet_data(int frames) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | { |
| 555 | int i; |
| 556 | struct packet_data *pkt; |
| 557 | |
Peter Osterlund | 1107d2e | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 558 | pkt = kzalloc(sizeof(struct packet_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | if (!pkt) |
| 560 | goto no_pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 562 | pkt->frames = frames; |
| 563 | pkt->w_bio = pkt_bio_alloc(frames); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | if (!pkt->w_bio) |
| 565 | goto no_bio; |
| 566 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 567 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | pkt->pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
| 569 | if (!pkt->pages[i]) |
| 570 | goto no_page; |
| 571 | } |
| 572 | |
| 573 | spin_lock_init(&pkt->lock); |
| 574 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 575 | for (i = 0; i < frames; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | struct bio *bio = pkt_bio_alloc(1); |
| 577 | if (!bio) |
| 578 | goto no_rd_bio; |
| 579 | pkt->r_bios[i] = bio; |
| 580 | } |
| 581 | |
| 582 | return pkt; |
| 583 | |
| 584 | no_rd_bio: |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 585 | for (i = 0; i < frames; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | struct bio *bio = pkt->r_bios[i]; |
| 587 | if (bio) |
| 588 | bio_put(bio); |
| 589 | } |
| 590 | |
| 591 | no_page: |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 592 | for (i = 0; i < frames / FRAMES_PER_PAGE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | if (pkt->pages[i]) |
| 594 | __free_page(pkt->pages[i]); |
| 595 | bio_put(pkt->w_bio); |
| 596 | no_bio: |
| 597 | kfree(pkt); |
| 598 | no_pkt: |
| 599 | return NULL; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * Free a packet_data struct |
| 604 | */ |
| 605 | static void pkt_free_packet_data(struct packet_data *pkt) |
| 606 | { |
| 607 | int i; |
| 608 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 609 | for (i = 0; i < pkt->frames; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | struct bio *bio = pkt->r_bios[i]; |
| 611 | if (bio) |
| 612 | bio_put(bio); |
| 613 | } |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 614 | for (i = 0; i < pkt->frames / FRAMES_PER_PAGE; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | __free_page(pkt->pages[i]); |
| 616 | bio_put(pkt->w_bio); |
| 617 | kfree(pkt); |
| 618 | } |
| 619 | |
| 620 | static void pkt_shrink_pktlist(struct pktcdvd_device *pd) |
| 621 | { |
| 622 | struct packet_data *pkt, *next; |
| 623 | |
| 624 | BUG_ON(!list_empty(&pd->cdrw.pkt_active_list)); |
| 625 | |
| 626 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_free_list, list) { |
| 627 | pkt_free_packet_data(pkt); |
| 628 | } |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 629 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
| 631 | |
| 632 | static int pkt_grow_pktlist(struct pktcdvd_device *pd, int nr_packets) |
| 633 | { |
| 634 | struct packet_data *pkt; |
| 635 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 636 | BUG_ON(!list_empty(&pd->cdrw.pkt_free_list)); |
| 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | while (nr_packets > 0) { |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 639 | pkt = pkt_alloc_packet_data(pd->settings.size >> 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | if (!pkt) { |
| 641 | pkt_shrink_pktlist(pd); |
| 642 | return 0; |
| 643 | } |
| 644 | pkt->id = nr_packets; |
| 645 | pkt->pd = pd; |
| 646 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); |
| 647 | nr_packets--; |
| 648 | } |
| 649 | return 1; |
| 650 | } |
| 651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | static inline struct pkt_rb_node *pkt_rbtree_next(struct pkt_rb_node *node) |
| 653 | { |
| 654 | struct rb_node *n = rb_next(&node->rb_node); |
| 655 | if (!n) |
| 656 | return NULL; |
| 657 | return rb_entry(n, struct pkt_rb_node, rb_node); |
| 658 | } |
| 659 | |
Peter Osterlund | ac89396 | 2006-01-14 13:21:32 -0800 | [diff] [blame] | 660 | static void pkt_rbtree_erase(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | { |
| 662 | rb_erase(&node->rb_node, &pd->bio_queue); |
| 663 | mempool_free(node, pd->rb_pool); |
| 664 | pd->bio_queue_size--; |
| 665 | BUG_ON(pd->bio_queue_size < 0); |
| 666 | } |
| 667 | |
| 668 | /* |
| 669 | * Find the first node in the pd->bio_queue rb tree with a starting sector >= s. |
| 670 | */ |
| 671 | static struct pkt_rb_node *pkt_rbtree_find(struct pktcdvd_device *pd, sector_t s) |
| 672 | { |
| 673 | struct rb_node *n = pd->bio_queue.rb_node; |
| 674 | struct rb_node *next; |
| 675 | struct pkt_rb_node *tmp; |
| 676 | |
| 677 | if (!n) { |
| 678 | BUG_ON(pd->bio_queue_size > 0); |
| 679 | return NULL; |
| 680 | } |
| 681 | |
| 682 | for (;;) { |
| 683 | tmp = rb_entry(n, struct pkt_rb_node, rb_node); |
| 684 | if (s <= tmp->bio->bi_sector) |
| 685 | next = n->rb_left; |
| 686 | else |
| 687 | next = n->rb_right; |
| 688 | if (!next) |
| 689 | break; |
| 690 | n = next; |
| 691 | } |
| 692 | |
| 693 | if (s > tmp->bio->bi_sector) { |
| 694 | tmp = pkt_rbtree_next(tmp); |
| 695 | if (!tmp) |
| 696 | return NULL; |
| 697 | } |
| 698 | BUG_ON(s > tmp->bio->bi_sector); |
| 699 | return tmp; |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * Insert a node into the pd->bio_queue rb tree. |
| 704 | */ |
| 705 | static void pkt_rbtree_insert(struct pktcdvd_device *pd, struct pkt_rb_node *node) |
| 706 | { |
| 707 | struct rb_node **p = &pd->bio_queue.rb_node; |
| 708 | struct rb_node *parent = NULL; |
| 709 | sector_t s = node->bio->bi_sector; |
| 710 | struct pkt_rb_node *tmp; |
| 711 | |
| 712 | while (*p) { |
| 713 | parent = *p; |
| 714 | tmp = rb_entry(parent, struct pkt_rb_node, rb_node); |
| 715 | if (s < tmp->bio->bi_sector) |
| 716 | p = &(*p)->rb_left; |
| 717 | else |
| 718 | p = &(*p)->rb_right; |
| 719 | } |
| 720 | rb_link_node(&node->rb_node, parent, p); |
| 721 | rb_insert_color(&node->rb_node, &pd->bio_queue); |
| 722 | pd->bio_queue_size++; |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Add a bio to a single linked list defined by its head and tail pointers. |
| 727 | */ |
Peter Osterlund | ac89396 | 2006-01-14 13:21:32 -0800 | [diff] [blame] | 728 | static void pkt_add_list_last(struct bio *bio, struct bio **list_head, struct bio **list_tail) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | { |
| 730 | bio->bi_next = NULL; |
| 731 | if (*list_tail) { |
| 732 | BUG_ON((*list_head) == NULL); |
| 733 | (*list_tail)->bi_next = bio; |
| 734 | (*list_tail) = bio; |
| 735 | } else { |
| 736 | BUG_ON((*list_head) != NULL); |
| 737 | (*list_head) = bio; |
| 738 | (*list_tail) = bio; |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | /* |
| 743 | * Remove and return the first bio from a single linked list defined by its |
| 744 | * head and tail pointers. |
| 745 | */ |
| 746 | static inline struct bio *pkt_get_list_first(struct bio **list_head, struct bio **list_tail) |
| 747 | { |
| 748 | struct bio *bio; |
| 749 | |
| 750 | if (*list_head == NULL) |
| 751 | return NULL; |
| 752 | |
| 753 | bio = *list_head; |
| 754 | *list_head = bio->bi_next; |
| 755 | if (*list_head == NULL) |
| 756 | *list_tail = NULL; |
| 757 | |
| 758 | bio->bi_next = NULL; |
| 759 | return bio; |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * Send a packet_command to the underlying block device and |
| 764 | * wait for completion. |
| 765 | */ |
| 766 | static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc) |
| 767 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 768 | struct request_queue *q = bdev_get_queue(pd->bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | struct request *rq; |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 770 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 772 | rq = blk_get_request(q, (cgc->data_direction == CGC_DATA_WRITE) ? |
| 773 | WRITE : READ, __GFP_WAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 775 | if (cgc->buflen) { |
| 776 | if (blk_rq_map_kern(q, rq, cgc->buffer, cgc->buflen, __GFP_WAIT)) |
| 777 | goto out; |
| 778 | } |
| 779 | |
Gerhard Dirschl | 91e4ee3 | 2007-02-20 13:57:56 -0800 | [diff] [blame] | 780 | rq->cmd_len = COMMAND_SIZE(cgc->cmd[0]); |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 781 | memcpy(rq->cmd, cgc->cmd, CDROM_PACKET_SIZE); |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | rq->timeout = 60*HZ; |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 784 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
| 785 | rq->cmd_flags |= REQ_HARDBARRIER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | if (cgc->quiet) |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 787 | rq->cmd_flags |= REQ_QUIET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 789 | blk_execute_rq(rq->q, pd->bdev->bd_disk, rq, 0); |
Andrew Morton | cbc31a4 | 2007-04-25 13:01:21 -0700 | [diff] [blame] | 790 | if (rq->errors) |
| 791 | ret = -EIO; |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 792 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | blk_put_request(rq); |
Christoph Hellwig | 406c9b6 | 2007-01-05 16:36:26 -0800 | [diff] [blame] | 794 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | /* |
| 798 | * A generic sense dump / resolve mechanism should be implemented across |
| 799 | * all ATAPI + SCSI devices. |
| 800 | */ |
| 801 | static void pkt_dump_sense(struct packet_command *cgc) |
| 802 | { |
| 803 | static char *info[9] = { "No sense", "Recovered error", "Not ready", |
| 804 | "Medium error", "Hardware error", "Illegal request", |
| 805 | "Unit attention", "Data protect", "Blank check" }; |
| 806 | int i; |
| 807 | struct request_sense *sense = cgc->sense; |
| 808 | |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 809 | printk(DRIVER_NAME":"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | for (i = 0; i < CDROM_PACKET_SIZE; i++) |
| 811 | printk(" %02x", cgc->cmd[i]); |
| 812 | printk(" - "); |
| 813 | |
| 814 | if (sense == NULL) { |
| 815 | printk("no sense\n"); |
| 816 | return; |
| 817 | } |
| 818 | |
| 819 | printk("sense %02x.%02x.%02x", sense->sense_key, sense->asc, sense->ascq); |
| 820 | |
| 821 | if (sense->sense_key > 8) { |
| 822 | printk(" (INVALID)\n"); |
| 823 | return; |
| 824 | } |
| 825 | |
| 826 | printk(" (%s)\n", info[sense->sense_key]); |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * flush the drive cache to media |
| 831 | */ |
| 832 | static int pkt_flush_cache(struct pktcdvd_device *pd) |
| 833 | { |
| 834 | struct packet_command cgc; |
| 835 | |
| 836 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 837 | cgc.cmd[0] = GPCMD_FLUSH_CACHE; |
| 838 | cgc.quiet = 1; |
| 839 | |
| 840 | /* |
| 841 | * the IMMED bit -- we default to not setting it, although that |
| 842 | * would allow a much faster close, this is safer |
| 843 | */ |
| 844 | #if 0 |
| 845 | cgc.cmd[1] = 1 << 1; |
| 846 | #endif |
| 847 | return pkt_generic_packet(pd, &cgc); |
| 848 | } |
| 849 | |
| 850 | /* |
| 851 | * speed is given as the normal factor, e.g. 4 for 4x |
| 852 | */ |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 853 | static noinline_for_stack int pkt_set_speed(struct pktcdvd_device *pd, |
| 854 | unsigned write_speed, unsigned read_speed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | { |
| 856 | struct packet_command cgc; |
| 857 | struct request_sense sense; |
| 858 | int ret; |
| 859 | |
| 860 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 861 | cgc.sense = &sense; |
| 862 | cgc.cmd[0] = GPCMD_SET_SPEED; |
| 863 | cgc.cmd[2] = (read_speed >> 8) & 0xff; |
| 864 | cgc.cmd[3] = read_speed & 0xff; |
| 865 | cgc.cmd[4] = (write_speed >> 8) & 0xff; |
| 866 | cgc.cmd[5] = write_speed & 0xff; |
| 867 | |
| 868 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 869 | pkt_dump_sense(&cgc); |
| 870 | |
| 871 | return ret; |
| 872 | } |
| 873 | |
| 874 | /* |
| 875 | * Queue a bio for processing by the low-level CD device. Must be called |
| 876 | * from process context. |
| 877 | */ |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 878 | static void pkt_queue_bio(struct pktcdvd_device *pd, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | { |
| 880 | spin_lock(&pd->iosched.lock); |
| 881 | if (bio_data_dir(bio) == READ) { |
| 882 | pkt_add_list_last(bio, &pd->iosched.read_queue, |
| 883 | &pd->iosched.read_queue_tail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | } else { |
| 885 | pkt_add_list_last(bio, &pd->iosched.write_queue, |
| 886 | &pd->iosched.write_queue_tail); |
| 887 | } |
| 888 | spin_unlock(&pd->iosched.lock); |
| 889 | |
| 890 | atomic_set(&pd->iosched.attention, 1); |
| 891 | wake_up(&pd->wqueue); |
| 892 | } |
| 893 | |
| 894 | /* |
| 895 | * Process the queued read/write requests. This function handles special |
| 896 | * requirements for CDRW drives: |
| 897 | * - A cache flush command must be inserted before a read request if the |
| 898 | * previous request was a write. |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 899 | * - Switching between reading and writing is slow, so don't do it more often |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | * than necessary. |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 901 | * - Optimize for throughput at the expense of latency. This means that streaming |
| 902 | * writes will never be interrupted by a read, but if the drive has to seek |
| 903 | * before the next write, switch to reading instead if there are any pending |
| 904 | * read requests. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | * - Set the read speed according to current usage pattern. When only reading |
| 906 | * from the device, it's best to use the highest possible read speed, but |
| 907 | * when switching often between reading and writing, it's better to have the |
| 908 | * same read and write speeds. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | */ |
| 910 | static void pkt_iosched_process_queue(struct pktcdvd_device *pd) |
| 911 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
| 913 | if (atomic_read(&pd->iosched.attention) == 0) |
| 914 | return; |
| 915 | atomic_set(&pd->iosched.attention, 0); |
| 916 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | for (;;) { |
| 918 | struct bio *bio; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 919 | int reads_queued, writes_queued; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | spin_lock(&pd->iosched.lock); |
| 922 | reads_queued = (pd->iosched.read_queue != NULL); |
| 923 | writes_queued = (pd->iosched.write_queue != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | spin_unlock(&pd->iosched.lock); |
| 925 | |
| 926 | if (!reads_queued && !writes_queued) |
| 927 | break; |
| 928 | |
| 929 | if (pd->iosched.writing) { |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 930 | int need_write_seek = 1; |
| 931 | spin_lock(&pd->iosched.lock); |
| 932 | bio = pd->iosched.write_queue; |
| 933 | spin_unlock(&pd->iosched.lock); |
| 934 | if (bio && (bio->bi_sector == pd->iosched.last_write)) |
| 935 | need_write_seek = 0; |
| 936 | if (need_write_seek && reads_queued) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 938 | VPRINTK(DRIVER_NAME": write, waiting\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | break; |
| 940 | } |
| 941 | pkt_flush_cache(pd); |
| 942 | pd->iosched.writing = 0; |
| 943 | } |
| 944 | } else { |
| 945 | if (!reads_queued && writes_queued) { |
| 946 | if (atomic_read(&pd->cdrw.pending_bios) > 0) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 947 | VPRINTK(DRIVER_NAME": read, waiting\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | break; |
| 949 | } |
| 950 | pd->iosched.writing = 1; |
| 951 | } |
| 952 | } |
| 953 | |
| 954 | spin_lock(&pd->iosched.lock); |
| 955 | if (pd->iosched.writing) { |
| 956 | bio = pkt_get_list_first(&pd->iosched.write_queue, |
| 957 | &pd->iosched.write_queue_tail); |
| 958 | } else { |
| 959 | bio = pkt_get_list_first(&pd->iosched.read_queue, |
| 960 | &pd->iosched.read_queue_tail); |
| 961 | } |
| 962 | spin_unlock(&pd->iosched.lock); |
| 963 | |
| 964 | if (!bio) |
| 965 | continue; |
| 966 | |
| 967 | if (bio_data_dir(bio) == READ) |
| 968 | pd->iosched.successive_reads += bio->bi_size >> 10; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 969 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | pd->iosched.successive_reads = 0; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 971 | pd->iosched.last_write = bio->bi_sector + bio_sectors(bio); |
| 972 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | if (pd->iosched.successive_reads >= HI_SPEED_SWITCH) { |
| 974 | if (pd->read_speed == pd->write_speed) { |
| 975 | pd->read_speed = MAX_SPEED; |
| 976 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); |
| 977 | } |
| 978 | } else { |
| 979 | if (pd->read_speed != pd->write_speed) { |
| 980 | pd->read_speed = pd->write_speed; |
| 981 | pkt_set_speed(pd, pd->write_speed, pd->read_speed); |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | atomic_inc(&pd->cdrw.pending_bios); |
| 986 | generic_make_request(bio); |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | /* |
| 991 | * Special care is needed if the underlying block device has a small |
| 992 | * max_phys_segments value. |
| 993 | */ |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 994 | static int pkt_set_segment_merging(struct pktcdvd_device *pd, struct request_queue *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | { |
| 996 | if ((pd->settings.size << 9) / CD_FRAMESIZE <= q->max_phys_segments) { |
| 997 | /* |
| 998 | * The cdrom device can handle one segment/frame |
| 999 | */ |
| 1000 | clear_bit(PACKET_MERGE_SEGS, &pd->flags); |
| 1001 | return 0; |
| 1002 | } else if ((pd->settings.size << 9) / PAGE_SIZE <= q->max_phys_segments) { |
| 1003 | /* |
| 1004 | * We can handle this case at the expense of some extra memory |
| 1005 | * copies during write operations |
| 1006 | */ |
| 1007 | set_bit(PACKET_MERGE_SEGS, &pd->flags); |
| 1008 | return 0; |
| 1009 | } else { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1010 | printk(DRIVER_NAME": cdrom max_phys_segments too small\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | return -EIO; |
| 1012 | } |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * Copy CD_FRAMESIZE bytes from src_bio into a destination page |
| 1017 | */ |
| 1018 | static void pkt_copy_bio_data(struct bio *src_bio, int seg, int offs, struct page *dst_page, int dst_offs) |
| 1019 | { |
| 1020 | unsigned int copy_size = CD_FRAMESIZE; |
| 1021 | |
| 1022 | while (copy_size > 0) { |
| 1023 | struct bio_vec *src_bvl = bio_iovec_idx(src_bio, seg); |
| 1024 | void *vfrom = kmap_atomic(src_bvl->bv_page, KM_USER0) + |
| 1025 | src_bvl->bv_offset + offs; |
| 1026 | void *vto = page_address(dst_page) + dst_offs; |
| 1027 | int len = min_t(int, copy_size, src_bvl->bv_len - offs); |
| 1028 | |
| 1029 | BUG_ON(len < 0); |
| 1030 | memcpy(vto, vfrom, len); |
| 1031 | kunmap_atomic(vfrom, KM_USER0); |
| 1032 | |
| 1033 | seg++; |
| 1034 | offs = 0; |
| 1035 | dst_offs += len; |
| 1036 | copy_size -= len; |
| 1037 | } |
| 1038 | } |
| 1039 | |
| 1040 | /* |
| 1041 | * Copy all data for this packet to pkt->pages[], so that |
| 1042 | * a) The number of required segments for the write bio is minimized, which |
| 1043 | * is necessary for some scsi controllers. |
| 1044 | * b) The data can be used as cache to avoid read requests if we receive a |
| 1045 | * new write request for the same zone. |
| 1046 | */ |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1047 | static void pkt_make_local_copy(struct packet_data *pkt, struct bio_vec *bvec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | { |
| 1049 | int f, p, offs; |
| 1050 | |
| 1051 | /* Copy all data to pkt->pages[] */ |
| 1052 | p = 0; |
| 1053 | offs = 0; |
| 1054 | for (f = 0; f < pkt->frames; f++) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1055 | if (bvec[f].bv_page != pkt->pages[p]) { |
| 1056 | void *vfrom = kmap_atomic(bvec[f].bv_page, KM_USER0) + bvec[f].bv_offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | void *vto = page_address(pkt->pages[p]) + offs; |
| 1058 | memcpy(vto, vfrom, CD_FRAMESIZE); |
| 1059 | kunmap_atomic(vfrom, KM_USER0); |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1060 | bvec[f].bv_page = pkt->pages[p]; |
| 1061 | bvec[f].bv_offset = offs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } else { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1063 | BUG_ON(bvec[f].bv_offset != offs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | } |
| 1065 | offs += CD_FRAMESIZE; |
| 1066 | if (offs >= PAGE_SIZE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | offs = 0; |
| 1068 | p++; |
| 1069 | } |
| 1070 | } |
| 1071 | } |
| 1072 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 1073 | static void pkt_end_io_read(struct bio *bio, int err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | { |
| 1075 | struct packet_data *pkt = bio->bi_private; |
| 1076 | struct pktcdvd_device *pd = pkt->pd; |
| 1077 | BUG_ON(!pd); |
| 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | VPRINTK("pkt_end_io_read: bio=%p sec0=%llx sec=%llx err=%d\n", bio, |
| 1080 | (unsigned long long)pkt->sector, (unsigned long long)bio->bi_sector, err); |
| 1081 | |
| 1082 | if (err) |
| 1083 | atomic_inc(&pkt->io_errors); |
| 1084 | if (atomic_dec_and_test(&pkt->io_wait)) { |
| 1085 | atomic_inc(&pkt->run_sm); |
| 1086 | wake_up(&pd->wqueue); |
| 1087 | } |
| 1088 | pkt_bio_finished(pd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | } |
| 1090 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 1091 | static void pkt_end_io_packet_write(struct bio *bio, int err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | { |
| 1093 | struct packet_data *pkt = bio->bi_private; |
| 1094 | struct pktcdvd_device *pd = pkt->pd; |
| 1095 | BUG_ON(!pd); |
| 1096 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | VPRINTK("pkt_end_io_packet_write: id=%d, err=%d\n", pkt->id, err); |
| 1098 | |
| 1099 | pd->stats.pkt_ended++; |
| 1100 | |
| 1101 | pkt_bio_finished(pd); |
| 1102 | atomic_dec(&pkt->io_wait); |
| 1103 | atomic_inc(&pkt->run_sm); |
| 1104 | wake_up(&pd->wqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | } |
| 1106 | |
| 1107 | /* |
| 1108 | * Schedule reads for the holes in a packet |
| 1109 | */ |
| 1110 | static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 1111 | { |
| 1112 | int frames_read = 0; |
| 1113 | struct bio *bio; |
| 1114 | int f; |
| 1115 | char written[PACKET_MAX_SIZE]; |
| 1116 | |
| 1117 | BUG_ON(!pkt->orig_bios); |
| 1118 | |
| 1119 | atomic_set(&pkt->io_wait, 0); |
| 1120 | atomic_set(&pkt->io_errors, 0); |
| 1121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | /* |
| 1123 | * Figure out which frames we need to read before we can write. |
| 1124 | */ |
| 1125 | memset(written, 0, sizeof(written)); |
| 1126 | spin_lock(&pkt->lock); |
| 1127 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { |
| 1128 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
| 1129 | int num_frames = bio->bi_size / CD_FRAMESIZE; |
Peter Osterlund | 06e7ab5 | 2005-09-13 01:25:28 -0700 | [diff] [blame] | 1130 | pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | BUG_ON(first_frame < 0); |
| 1132 | BUG_ON(first_frame + num_frames > pkt->frames); |
| 1133 | for (f = first_frame; f < first_frame + num_frames; f++) |
| 1134 | written[f] = 1; |
| 1135 | } |
| 1136 | spin_unlock(&pkt->lock); |
| 1137 | |
Peter Osterlund | 06e7ab5 | 2005-09-13 01:25:28 -0700 | [diff] [blame] | 1138 | if (pkt->cache_valid) { |
| 1139 | VPRINTK("pkt_gather_data: zone %llx cached\n", |
| 1140 | (unsigned long long)pkt->sector); |
| 1141 | goto out_account; |
| 1142 | } |
| 1143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | /* |
| 1145 | * Schedule reads for missing parts of the packet. |
| 1146 | */ |
| 1147 | for (f = 0; f < pkt->frames; f++) { |
Jens Axboe | 761a15e | 2007-09-14 13:06:53 +0200 | [diff] [blame] | 1148 | struct bio_vec *vec; |
| 1149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | int p, offset; |
| 1151 | if (written[f]) |
| 1152 | continue; |
| 1153 | bio = pkt->r_bios[f]; |
Jens Axboe | 761a15e | 2007-09-14 13:06:53 +0200 | [diff] [blame] | 1154 | vec = bio->bi_io_vec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | bio_init(bio); |
| 1156 | bio->bi_max_vecs = 1; |
| 1157 | bio->bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9); |
| 1158 | bio->bi_bdev = pd->bdev; |
| 1159 | bio->bi_end_io = pkt_end_io_read; |
| 1160 | bio->bi_private = pkt; |
Jens Axboe | 761a15e | 2007-09-14 13:06:53 +0200 | [diff] [blame] | 1161 | bio->bi_io_vec = vec; |
Laurent Riffard | 7e3da6c | 2007-09-21 08:32:28 +0200 | [diff] [blame] | 1162 | bio->bi_destructor = pkt_bio_destructor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
| 1164 | p = (f * CD_FRAMESIZE) / PAGE_SIZE; |
| 1165 | offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
| 1166 | VPRINTK("pkt_gather_data: Adding frame %d, page:%p offs:%d\n", |
| 1167 | f, pkt->pages[p], offset); |
| 1168 | if (!bio_add_page(bio, pkt->pages[p], CD_FRAMESIZE, offset)) |
| 1169 | BUG(); |
| 1170 | |
| 1171 | atomic_inc(&pkt->io_wait); |
| 1172 | bio->bi_rw = READ; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 1173 | pkt_queue_bio(pd, bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | frames_read++; |
| 1175 | } |
| 1176 | |
| 1177 | out_account: |
| 1178 | VPRINTK("pkt_gather_data: need %d frames for zone %llx\n", |
| 1179 | frames_read, (unsigned long long)pkt->sector); |
| 1180 | pd->stats.pkt_started++; |
| 1181 | pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * Find a packet matching zone, or the least recently used packet if |
| 1186 | * there is no match. |
| 1187 | */ |
| 1188 | static struct packet_data *pkt_get_packet_data(struct pktcdvd_device *pd, int zone) |
| 1189 | { |
| 1190 | struct packet_data *pkt; |
| 1191 | |
| 1192 | list_for_each_entry(pkt, &pd->cdrw.pkt_free_list, list) { |
| 1193 | if (pkt->sector == zone || pkt->list.next == &pd->cdrw.pkt_free_list) { |
| 1194 | list_del_init(&pkt->list); |
| 1195 | if (pkt->sector != zone) |
| 1196 | pkt->cache_valid = 0; |
Peter Osterlund | 610827d | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 1197 | return pkt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | } |
| 1199 | } |
Peter Osterlund | 610827d | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 1200 | BUG(); |
| 1201 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | static void pkt_put_packet_data(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 1205 | { |
| 1206 | if (pkt->cache_valid) { |
| 1207 | list_add(&pkt->list, &pd->cdrw.pkt_free_list); |
| 1208 | } else { |
| 1209 | list_add_tail(&pkt->list, &pd->cdrw.pkt_free_list); |
| 1210 | } |
| 1211 | } |
| 1212 | |
| 1213 | /* |
| 1214 | * recover a failed write, query for relocation if possible |
| 1215 | * |
| 1216 | * returns 1 if recovery is possible, or 0 if not |
| 1217 | * |
| 1218 | */ |
| 1219 | static int pkt_start_recovery(struct packet_data *pkt) |
| 1220 | { |
| 1221 | /* |
| 1222 | * FIXME. We need help from the file system to implement |
| 1223 | * recovery handling. |
| 1224 | */ |
| 1225 | return 0; |
| 1226 | #if 0 |
| 1227 | struct request *rq = pkt->rq; |
| 1228 | struct pktcdvd_device *pd = rq->rq_disk->private_data; |
| 1229 | struct block_device *pkt_bdev; |
| 1230 | struct super_block *sb = NULL; |
| 1231 | unsigned long old_block, new_block; |
| 1232 | sector_t new_sector; |
| 1233 | |
| 1234 | pkt_bdev = bdget(kdev_t_to_nr(pd->pkt_dev)); |
| 1235 | if (pkt_bdev) { |
| 1236 | sb = get_super(pkt_bdev); |
| 1237 | bdput(pkt_bdev); |
| 1238 | } |
| 1239 | |
| 1240 | if (!sb) |
| 1241 | return 0; |
| 1242 | |
| 1243 | if (!sb->s_op || !sb->s_op->relocate_blocks) |
| 1244 | goto out; |
| 1245 | |
| 1246 | old_block = pkt->sector / (CD_FRAMESIZE >> 9); |
| 1247 | if (sb->s_op->relocate_blocks(sb, old_block, &new_block)) |
| 1248 | goto out; |
| 1249 | |
| 1250 | new_sector = new_block * (CD_FRAMESIZE >> 9); |
| 1251 | pkt->sector = new_sector; |
| 1252 | |
| 1253 | pkt->bio->bi_sector = new_sector; |
| 1254 | pkt->bio->bi_next = NULL; |
| 1255 | pkt->bio->bi_flags = 1 << BIO_UPTODATE; |
| 1256 | pkt->bio->bi_idx = 0; |
| 1257 | |
| 1258 | BUG_ON(pkt->bio->bi_rw != (1 << BIO_RW)); |
| 1259 | BUG_ON(pkt->bio->bi_vcnt != pkt->frames); |
| 1260 | BUG_ON(pkt->bio->bi_size != pkt->frames * CD_FRAMESIZE); |
| 1261 | BUG_ON(pkt->bio->bi_end_io != pkt_end_io_packet_write); |
| 1262 | BUG_ON(pkt->bio->bi_private != pkt); |
| 1263 | |
| 1264 | drop_super(sb); |
| 1265 | return 1; |
| 1266 | |
| 1267 | out: |
| 1268 | drop_super(sb); |
| 1269 | return 0; |
| 1270 | #endif |
| 1271 | } |
| 1272 | |
| 1273 | static inline void pkt_set_state(struct packet_data *pkt, enum packet_data_state state) |
| 1274 | { |
| 1275 | #if PACKET_DEBUG > 1 |
| 1276 | static const char *state_name[] = { |
| 1277 | "IDLE", "WAITING", "READ_WAIT", "WRITE_WAIT", "RECOVERY", "FINISHED" |
| 1278 | }; |
| 1279 | enum packet_data_state old_state = pkt->state; |
| 1280 | VPRINTK("pkt %2d : s=%6llx %s -> %s\n", pkt->id, (unsigned long long)pkt->sector, |
| 1281 | state_name[old_state], state_name[state]); |
| 1282 | #endif |
| 1283 | pkt->state = state; |
| 1284 | } |
| 1285 | |
| 1286 | /* |
| 1287 | * Scan the work queue to see if we can start a new packet. |
| 1288 | * returns non-zero if any work was done. |
| 1289 | */ |
| 1290 | static int pkt_handle_queue(struct pktcdvd_device *pd) |
| 1291 | { |
| 1292 | struct packet_data *pkt, *p; |
| 1293 | struct bio *bio = NULL; |
| 1294 | sector_t zone = 0; /* Suppress gcc warning */ |
| 1295 | struct pkt_rb_node *node, *first_node; |
| 1296 | struct rb_node *n; |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 1297 | int wakeup; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
| 1299 | VPRINTK("handle_queue\n"); |
| 1300 | |
| 1301 | atomic_set(&pd->scan_queue, 0); |
| 1302 | |
| 1303 | if (list_empty(&pd->cdrw.pkt_free_list)) { |
| 1304 | VPRINTK("handle_queue: no pkt\n"); |
| 1305 | return 0; |
| 1306 | } |
| 1307 | |
| 1308 | /* |
| 1309 | * Try to find a zone we are not already working on. |
| 1310 | */ |
| 1311 | spin_lock(&pd->lock); |
| 1312 | first_node = pkt_rbtree_find(pd, pd->current_sector); |
| 1313 | if (!first_node) { |
| 1314 | n = rb_first(&pd->bio_queue); |
| 1315 | if (n) |
| 1316 | first_node = rb_entry(n, struct pkt_rb_node, rb_node); |
| 1317 | } |
| 1318 | node = first_node; |
| 1319 | while (node) { |
| 1320 | bio = node->bio; |
| 1321 | zone = ZONE(bio->bi_sector, pd); |
| 1322 | list_for_each_entry(p, &pd->cdrw.pkt_active_list, list) { |
Peter Osterlund | 7baeb6a | 2005-05-16 21:53:42 -0700 | [diff] [blame] | 1323 | if (p->sector == zone) { |
| 1324 | bio = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | goto try_next_bio; |
Peter Osterlund | 7baeb6a | 2005-05-16 21:53:42 -0700 | [diff] [blame] | 1326 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | } |
| 1328 | break; |
| 1329 | try_next_bio: |
| 1330 | node = pkt_rbtree_next(node); |
| 1331 | if (!node) { |
| 1332 | n = rb_first(&pd->bio_queue); |
| 1333 | if (n) |
| 1334 | node = rb_entry(n, struct pkt_rb_node, rb_node); |
| 1335 | } |
| 1336 | if (node == first_node) |
| 1337 | node = NULL; |
| 1338 | } |
| 1339 | spin_unlock(&pd->lock); |
| 1340 | if (!bio) { |
| 1341 | VPRINTK("handle_queue: no bio\n"); |
| 1342 | return 0; |
| 1343 | } |
| 1344 | |
| 1345 | pkt = pkt_get_packet_data(pd, zone); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | |
| 1347 | pd->current_sector = zone + pd->settings.size; |
| 1348 | pkt->sector = zone; |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 1349 | BUG_ON(pkt->frames != pd->settings.size >> 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | pkt->write_size = 0; |
| 1351 | |
| 1352 | /* |
| 1353 | * Scan work queue for bios in the same zone and link them |
| 1354 | * to this packet. |
| 1355 | */ |
| 1356 | spin_lock(&pd->lock); |
| 1357 | VPRINTK("pkt_handle_queue: looking for zone %llx\n", (unsigned long long)zone); |
| 1358 | while ((node = pkt_rbtree_find(pd, zone)) != NULL) { |
| 1359 | bio = node->bio; |
| 1360 | VPRINTK("pkt_handle_queue: found zone=%llx\n", |
| 1361 | (unsigned long long)ZONE(bio->bi_sector, pd)); |
| 1362 | if (ZONE(bio->bi_sector, pd) != zone) |
| 1363 | break; |
| 1364 | pkt_rbtree_erase(pd, node); |
| 1365 | spin_lock(&pkt->lock); |
| 1366 | pkt_add_list_last(bio, &pkt->orig_bios, &pkt->orig_bios_tail); |
| 1367 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
| 1368 | spin_unlock(&pkt->lock); |
| 1369 | } |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 1370 | /* check write congestion marks, and if bio_queue_size is |
| 1371 | below, wake up any waiters */ |
| 1372 | wakeup = (pd->write_congestion_on > 0 |
| 1373 | && pd->bio_queue_size <= pd->write_congestion_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | spin_unlock(&pd->lock); |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 1375 | if (wakeup) |
Thomas Maier | 83f3aa3 | 2007-02-10 01:45:11 -0800 | [diff] [blame] | 1376 | clear_bdi_congested(&pd->disk->queue->backing_dev_info, WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
| 1378 | pkt->sleep_time = max(PACKET_WAIT_TIME, 1); |
| 1379 | pkt_set_state(pkt, PACKET_WAITING_STATE); |
| 1380 | atomic_set(&pkt->run_sm, 1); |
| 1381 | |
| 1382 | spin_lock(&pd->cdrw.active_list_lock); |
| 1383 | list_add(&pkt->list, &pd->cdrw.pkt_active_list); |
| 1384 | spin_unlock(&pd->cdrw.active_list_lock); |
| 1385 | |
| 1386 | return 1; |
| 1387 | } |
| 1388 | |
| 1389 | /* |
| 1390 | * Assemble a bio to write one packet and queue the bio for processing |
| 1391 | * by the underlying block device. |
| 1392 | */ |
| 1393 | static void pkt_start_write(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 1394 | { |
| 1395 | struct bio *bio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | int f; |
| 1397 | int frames_write; |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1398 | struct bio_vec *bvec = pkt->w_bio->bi_io_vec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | |
| 1400 | for (f = 0; f < pkt->frames; f++) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1401 | bvec[f].bv_page = pkt->pages[(f * CD_FRAMESIZE) / PAGE_SIZE]; |
| 1402 | bvec[f].bv_offset = (f * CD_FRAMESIZE) % PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | } |
| 1404 | |
| 1405 | /* |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1406 | * Fill-in bvec with data from orig_bios. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | */ |
| 1408 | frames_write = 0; |
| 1409 | spin_lock(&pkt->lock); |
| 1410 | for (bio = pkt->orig_bios; bio; bio = bio->bi_next) { |
| 1411 | int segment = bio->bi_idx; |
| 1412 | int src_offs = 0; |
| 1413 | int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9); |
| 1414 | int num_frames = bio->bi_size / CD_FRAMESIZE; |
| 1415 | BUG_ON(first_frame < 0); |
| 1416 | BUG_ON(first_frame + num_frames > pkt->frames); |
| 1417 | for (f = first_frame; f < first_frame + num_frames; f++) { |
| 1418 | struct bio_vec *src_bvl = bio_iovec_idx(bio, segment); |
| 1419 | |
| 1420 | while (src_offs >= src_bvl->bv_len) { |
| 1421 | src_offs -= src_bvl->bv_len; |
| 1422 | segment++; |
| 1423 | BUG_ON(segment >= bio->bi_vcnt); |
| 1424 | src_bvl = bio_iovec_idx(bio, segment); |
| 1425 | } |
| 1426 | |
| 1427 | if (src_bvl->bv_len - src_offs >= CD_FRAMESIZE) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1428 | bvec[f].bv_page = src_bvl->bv_page; |
| 1429 | bvec[f].bv_offset = src_bvl->bv_offset + src_offs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | } else { |
| 1431 | pkt_copy_bio_data(bio, segment, src_offs, |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1432 | bvec[f].bv_page, bvec[f].bv_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | } |
| 1434 | src_offs += CD_FRAMESIZE; |
| 1435 | frames_write++; |
| 1436 | } |
| 1437 | } |
| 1438 | pkt_set_state(pkt, PACKET_WRITE_WAIT_STATE); |
| 1439 | spin_unlock(&pkt->lock); |
| 1440 | |
| 1441 | VPRINTK("pkt_start_write: Writing %d frames for zone %llx\n", |
| 1442 | frames_write, (unsigned long long)pkt->sector); |
| 1443 | BUG_ON(frames_write != pkt->write_size); |
| 1444 | |
| 1445 | if (test_bit(PACKET_MERGE_SEGS, &pd->flags) || (pkt->write_size < pkt->frames)) { |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1446 | pkt_make_local_copy(pkt, bvec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | pkt->cache_valid = 1; |
| 1448 | } else { |
| 1449 | pkt->cache_valid = 0; |
| 1450 | } |
| 1451 | |
| 1452 | /* Start the write request */ |
| 1453 | bio_init(pkt->w_bio); |
| 1454 | pkt->w_bio->bi_max_vecs = PACKET_MAX_SIZE; |
| 1455 | pkt->w_bio->bi_sector = pkt->sector; |
| 1456 | pkt->w_bio->bi_bdev = pd->bdev; |
| 1457 | pkt->w_bio->bi_end_io = pkt_end_io_packet_write; |
| 1458 | pkt->w_bio->bi_private = pkt; |
Jens Axboe | 761a15e | 2007-09-14 13:06:53 +0200 | [diff] [blame] | 1459 | pkt->w_bio->bi_io_vec = bvec; |
Laurent Riffard | 7e3da6c | 2007-09-21 08:32:28 +0200 | [diff] [blame] | 1460 | pkt->w_bio->bi_destructor = pkt_bio_destructor; |
Peter Osterlund | 7277232 | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 1461 | for (f = 0; f < pkt->frames; f++) |
| 1462 | if (!bio_add_page(pkt->w_bio, bvec[f].bv_page, CD_FRAMESIZE, bvec[f].bv_offset)) |
| 1463 | BUG(); |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1464 | VPRINTK(DRIVER_NAME": vcnt=%d\n", pkt->w_bio->bi_vcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | |
| 1466 | atomic_set(&pkt->io_wait, 1); |
| 1467 | pkt->w_bio->bi_rw = WRITE; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 1468 | pkt_queue_bio(pd, pkt->w_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | } |
| 1470 | |
| 1471 | static void pkt_finish_packet(struct packet_data *pkt, int uptodate) |
| 1472 | { |
| 1473 | struct bio *bio, *next; |
| 1474 | |
| 1475 | if (!uptodate) |
| 1476 | pkt->cache_valid = 0; |
| 1477 | |
| 1478 | /* Finish all bios corresponding to this packet */ |
| 1479 | bio = pkt->orig_bios; |
| 1480 | while (bio) { |
| 1481 | next = bio->bi_next; |
| 1482 | bio->bi_next = NULL; |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 1483 | bio_endio(bio, uptodate ? 0 : -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | bio = next; |
| 1485 | } |
| 1486 | pkt->orig_bios = pkt->orig_bios_tail = NULL; |
| 1487 | } |
| 1488 | |
| 1489 | static void pkt_run_state_machine(struct pktcdvd_device *pd, struct packet_data *pkt) |
| 1490 | { |
| 1491 | int uptodate; |
| 1492 | |
| 1493 | VPRINTK("run_state_machine: pkt %d\n", pkt->id); |
| 1494 | |
| 1495 | for (;;) { |
| 1496 | switch (pkt->state) { |
| 1497 | case PACKET_WAITING_STATE: |
| 1498 | if ((pkt->write_size < pkt->frames) && (pkt->sleep_time > 0)) |
| 1499 | return; |
| 1500 | |
| 1501 | pkt->sleep_time = 0; |
| 1502 | pkt_gather_data(pd, pkt); |
| 1503 | pkt_set_state(pkt, PACKET_READ_WAIT_STATE); |
| 1504 | break; |
| 1505 | |
| 1506 | case PACKET_READ_WAIT_STATE: |
| 1507 | if (atomic_read(&pkt->io_wait) > 0) |
| 1508 | return; |
| 1509 | |
| 1510 | if (atomic_read(&pkt->io_errors) > 0) { |
| 1511 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
| 1512 | } else { |
| 1513 | pkt_start_write(pd, pkt); |
| 1514 | } |
| 1515 | break; |
| 1516 | |
| 1517 | case PACKET_WRITE_WAIT_STATE: |
| 1518 | if (atomic_read(&pkt->io_wait) > 0) |
| 1519 | return; |
| 1520 | |
| 1521 | if (test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags)) { |
| 1522 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
| 1523 | } else { |
| 1524 | pkt_set_state(pkt, PACKET_RECOVERY_STATE); |
| 1525 | } |
| 1526 | break; |
| 1527 | |
| 1528 | case PACKET_RECOVERY_STATE: |
| 1529 | if (pkt_start_recovery(pkt)) { |
| 1530 | pkt_start_write(pd, pkt); |
| 1531 | } else { |
| 1532 | VPRINTK("No recovery possible\n"); |
| 1533 | pkt_set_state(pkt, PACKET_FINISHED_STATE); |
| 1534 | } |
| 1535 | break; |
| 1536 | |
| 1537 | case PACKET_FINISHED_STATE: |
| 1538 | uptodate = test_bit(BIO_UPTODATE, &pkt->w_bio->bi_flags); |
| 1539 | pkt_finish_packet(pkt, uptodate); |
| 1540 | return; |
| 1541 | |
| 1542 | default: |
| 1543 | BUG(); |
| 1544 | break; |
| 1545 | } |
| 1546 | } |
| 1547 | } |
| 1548 | |
| 1549 | static void pkt_handle_packets(struct pktcdvd_device *pd) |
| 1550 | { |
| 1551 | struct packet_data *pkt, *next; |
| 1552 | |
| 1553 | VPRINTK("pkt_handle_packets\n"); |
| 1554 | |
| 1555 | /* |
| 1556 | * Run state machine for active packets |
| 1557 | */ |
| 1558 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1559 | if (atomic_read(&pkt->run_sm) > 0) { |
| 1560 | atomic_set(&pkt->run_sm, 0); |
| 1561 | pkt_run_state_machine(pd, pkt); |
| 1562 | } |
| 1563 | } |
| 1564 | |
| 1565 | /* |
| 1566 | * Move no longer active packets to the free list |
| 1567 | */ |
| 1568 | spin_lock(&pd->cdrw.active_list_lock); |
| 1569 | list_for_each_entry_safe(pkt, next, &pd->cdrw.pkt_active_list, list) { |
| 1570 | if (pkt->state == PACKET_FINISHED_STATE) { |
| 1571 | list_del(&pkt->list); |
| 1572 | pkt_put_packet_data(pd, pkt); |
| 1573 | pkt_set_state(pkt, PACKET_IDLE_STATE); |
| 1574 | atomic_set(&pd->scan_queue, 1); |
| 1575 | } |
| 1576 | } |
| 1577 | spin_unlock(&pd->cdrw.active_list_lock); |
| 1578 | } |
| 1579 | |
| 1580 | static void pkt_count_states(struct pktcdvd_device *pd, int *states) |
| 1581 | { |
| 1582 | struct packet_data *pkt; |
| 1583 | int i; |
| 1584 | |
Peter Osterlund | ae7642b | 2005-11-13 16:06:36 -0800 | [diff] [blame] | 1585 | for (i = 0; i < PACKET_NUM_STATES; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | states[i] = 0; |
| 1587 | |
| 1588 | spin_lock(&pd->cdrw.active_list_lock); |
| 1589 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1590 | states[pkt->state]++; |
| 1591 | } |
| 1592 | spin_unlock(&pd->cdrw.active_list_lock); |
| 1593 | } |
| 1594 | |
| 1595 | /* |
| 1596 | * kcdrwd is woken up when writes have been queued for one of our |
| 1597 | * registered devices |
| 1598 | */ |
| 1599 | static int kcdrwd(void *foobar) |
| 1600 | { |
| 1601 | struct pktcdvd_device *pd = foobar; |
| 1602 | struct packet_data *pkt; |
| 1603 | long min_sleep_time, residue; |
| 1604 | |
| 1605 | set_user_nice(current, -20); |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 1606 | set_freezable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | |
| 1608 | for (;;) { |
| 1609 | DECLARE_WAITQUEUE(wait, current); |
| 1610 | |
| 1611 | /* |
| 1612 | * Wait until there is something to do |
| 1613 | */ |
| 1614 | add_wait_queue(&pd->wqueue, &wait); |
| 1615 | for (;;) { |
| 1616 | set_current_state(TASK_INTERRUPTIBLE); |
| 1617 | |
| 1618 | /* Check if we need to run pkt_handle_queue */ |
| 1619 | if (atomic_read(&pd->scan_queue) > 0) |
| 1620 | goto work_to_do; |
| 1621 | |
| 1622 | /* Check if we need to run the state machine for some packet */ |
| 1623 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1624 | if (atomic_read(&pkt->run_sm) > 0) |
| 1625 | goto work_to_do; |
| 1626 | } |
| 1627 | |
| 1628 | /* Check if we need to process the iosched queues */ |
| 1629 | if (atomic_read(&pd->iosched.attention) != 0) |
| 1630 | goto work_to_do; |
| 1631 | |
| 1632 | /* Otherwise, go to sleep */ |
| 1633 | if (PACKET_DEBUG > 1) { |
| 1634 | int states[PACKET_NUM_STATES]; |
| 1635 | pkt_count_states(pd, states); |
| 1636 | VPRINTK("kcdrwd: i:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
| 1637 | states[0], states[1], states[2], states[3], |
| 1638 | states[4], states[5]); |
| 1639 | } |
| 1640 | |
| 1641 | min_sleep_time = MAX_SCHEDULE_TIMEOUT; |
| 1642 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1643 | if (pkt->sleep_time && pkt->sleep_time < min_sleep_time) |
| 1644 | min_sleep_time = pkt->sleep_time; |
| 1645 | } |
| 1646 | |
| 1647 | generic_unplug_device(bdev_get_queue(pd->bdev)); |
| 1648 | |
| 1649 | VPRINTK("kcdrwd: sleeping\n"); |
| 1650 | residue = schedule_timeout(min_sleep_time); |
| 1651 | VPRINTK("kcdrwd: wake up\n"); |
| 1652 | |
| 1653 | /* make swsusp happy with our thread */ |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 1654 | try_to_freeze(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
| 1656 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 1657 | if (!pkt->sleep_time) |
| 1658 | continue; |
| 1659 | pkt->sleep_time -= min_sleep_time - residue; |
| 1660 | if (pkt->sleep_time <= 0) { |
| 1661 | pkt->sleep_time = 0; |
| 1662 | atomic_inc(&pkt->run_sm); |
| 1663 | } |
| 1664 | } |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | if (kthread_should_stop()) |
| 1667 | break; |
| 1668 | } |
| 1669 | work_to_do: |
| 1670 | set_current_state(TASK_RUNNING); |
| 1671 | remove_wait_queue(&pd->wqueue, &wait); |
| 1672 | |
| 1673 | if (kthread_should_stop()) |
| 1674 | break; |
| 1675 | |
| 1676 | /* |
| 1677 | * if pkt_handle_queue returns true, we can queue |
| 1678 | * another request. |
| 1679 | */ |
| 1680 | while (pkt_handle_queue(pd)) |
| 1681 | ; |
| 1682 | |
| 1683 | /* |
| 1684 | * Handle packet state machine |
| 1685 | */ |
| 1686 | pkt_handle_packets(pd); |
| 1687 | |
| 1688 | /* |
| 1689 | * Handle iosched queues |
| 1690 | */ |
| 1691 | pkt_iosched_process_queue(pd); |
| 1692 | } |
| 1693 | |
| 1694 | return 0; |
| 1695 | } |
| 1696 | |
| 1697 | static void pkt_print_settings(struct pktcdvd_device *pd) |
| 1698 | { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1699 | printk(DRIVER_NAME": %s packets, ", pd->settings.fp ? "Fixed" : "Variable"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | printk("%u blocks, ", pd->settings.size >> 2); |
| 1701 | printk("Mode-%c disc\n", pd->settings.block_mode == 8 ? '1' : '2'); |
| 1702 | } |
| 1703 | |
| 1704 | static int pkt_mode_sense(struct pktcdvd_device *pd, struct packet_command *cgc, int page_code, int page_control) |
| 1705 | { |
| 1706 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); |
| 1707 | |
| 1708 | cgc->cmd[0] = GPCMD_MODE_SENSE_10; |
| 1709 | cgc->cmd[2] = page_code | (page_control << 6); |
| 1710 | cgc->cmd[7] = cgc->buflen >> 8; |
| 1711 | cgc->cmd[8] = cgc->buflen & 0xff; |
| 1712 | cgc->data_direction = CGC_DATA_READ; |
| 1713 | return pkt_generic_packet(pd, cgc); |
| 1714 | } |
| 1715 | |
| 1716 | static int pkt_mode_select(struct pktcdvd_device *pd, struct packet_command *cgc) |
| 1717 | { |
| 1718 | memset(cgc->cmd, 0, sizeof(cgc->cmd)); |
| 1719 | memset(cgc->buffer, 0, 2); |
| 1720 | cgc->cmd[0] = GPCMD_MODE_SELECT_10; |
| 1721 | cgc->cmd[1] = 0x10; /* PF */ |
| 1722 | cgc->cmd[7] = cgc->buflen >> 8; |
| 1723 | cgc->cmd[8] = cgc->buflen & 0xff; |
| 1724 | cgc->data_direction = CGC_DATA_WRITE; |
| 1725 | return pkt_generic_packet(pd, cgc); |
| 1726 | } |
| 1727 | |
| 1728 | static int pkt_get_disc_info(struct pktcdvd_device *pd, disc_information *di) |
| 1729 | { |
| 1730 | struct packet_command cgc; |
| 1731 | int ret; |
| 1732 | |
| 1733 | /* set up command and get the disc info */ |
| 1734 | init_cdrom_command(&cgc, di, sizeof(*di), CGC_DATA_READ); |
| 1735 | cgc.cmd[0] = GPCMD_READ_DISC_INFO; |
| 1736 | cgc.cmd[8] = cgc.buflen = 2; |
| 1737 | cgc.quiet = 1; |
| 1738 | |
| 1739 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 1740 | return ret; |
| 1741 | |
| 1742 | /* not all drives have the same disc_info length, so requeue |
| 1743 | * packet with the length the drive tells us it can supply |
| 1744 | */ |
| 1745 | cgc.buflen = be16_to_cpu(di->disc_information_length) + |
| 1746 | sizeof(di->disc_information_length); |
| 1747 | |
| 1748 | if (cgc.buflen > sizeof(disc_information)) |
| 1749 | cgc.buflen = sizeof(disc_information); |
| 1750 | |
| 1751 | cgc.cmd[8] = cgc.buflen; |
| 1752 | return pkt_generic_packet(pd, &cgc); |
| 1753 | } |
| 1754 | |
| 1755 | static int pkt_get_track_info(struct pktcdvd_device *pd, __u16 track, __u8 type, track_information *ti) |
| 1756 | { |
| 1757 | struct packet_command cgc; |
| 1758 | int ret; |
| 1759 | |
| 1760 | init_cdrom_command(&cgc, ti, 8, CGC_DATA_READ); |
| 1761 | cgc.cmd[0] = GPCMD_READ_TRACK_RZONE_INFO; |
| 1762 | cgc.cmd[1] = type & 3; |
| 1763 | cgc.cmd[4] = (track & 0xff00) >> 8; |
| 1764 | cgc.cmd[5] = track & 0xff; |
| 1765 | cgc.cmd[8] = 8; |
| 1766 | cgc.quiet = 1; |
| 1767 | |
| 1768 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 1769 | return ret; |
| 1770 | |
| 1771 | cgc.buflen = be16_to_cpu(ti->track_information_length) + |
| 1772 | sizeof(ti->track_information_length); |
| 1773 | |
| 1774 | if (cgc.buflen > sizeof(track_information)) |
| 1775 | cgc.buflen = sizeof(track_information); |
| 1776 | |
| 1777 | cgc.cmd[8] = cgc.buflen; |
| 1778 | return pkt_generic_packet(pd, &cgc); |
| 1779 | } |
| 1780 | |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 1781 | static noinline_for_stack int pkt_get_last_written(struct pktcdvd_device *pd, |
| 1782 | long *last_written) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | { |
| 1784 | disc_information di; |
| 1785 | track_information ti; |
| 1786 | __u32 last_track; |
| 1787 | int ret = -1; |
| 1788 | |
| 1789 | if ((ret = pkt_get_disc_info(pd, &di))) |
| 1790 | return ret; |
| 1791 | |
| 1792 | last_track = (di.last_track_msb << 8) | di.last_track_lsb; |
| 1793 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
| 1794 | return ret; |
| 1795 | |
| 1796 | /* if this track is blank, try the previous. */ |
| 1797 | if (ti.blank) { |
| 1798 | last_track--; |
| 1799 | if ((ret = pkt_get_track_info(pd, last_track, 1, &ti))) |
| 1800 | return ret; |
| 1801 | } |
| 1802 | |
| 1803 | /* if last recorded field is valid, return it. */ |
| 1804 | if (ti.lra_v) { |
| 1805 | *last_written = be32_to_cpu(ti.last_rec_address); |
| 1806 | } else { |
| 1807 | /* make it up instead */ |
| 1808 | *last_written = be32_to_cpu(ti.track_start) + |
| 1809 | be32_to_cpu(ti.track_size); |
| 1810 | if (ti.free_blocks) |
| 1811 | *last_written -= (be32_to_cpu(ti.free_blocks) + 7); |
| 1812 | } |
| 1813 | return 0; |
| 1814 | } |
| 1815 | |
| 1816 | /* |
| 1817 | * write mode select package based on pd->settings |
| 1818 | */ |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 1819 | static noinline_for_stack int pkt_set_write_settings(struct pktcdvd_device *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | { |
| 1821 | struct packet_command cgc; |
| 1822 | struct request_sense sense; |
| 1823 | write_param_page *wp; |
| 1824 | char buffer[128]; |
| 1825 | int ret, size; |
| 1826 | |
| 1827 | /* doesn't apply to DVD+RW or DVD-RAM */ |
| 1828 | if ((pd->mmc3_profile == 0x1a) || (pd->mmc3_profile == 0x12)) |
| 1829 | return 0; |
| 1830 | |
| 1831 | memset(buffer, 0, sizeof(buffer)); |
| 1832 | init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ); |
| 1833 | cgc.sense = &sense; |
| 1834 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
| 1835 | pkt_dump_sense(&cgc); |
| 1836 | return ret; |
| 1837 | } |
| 1838 | |
| 1839 | size = 2 + ((buffer[0] << 8) | (buffer[1] & 0xff)); |
| 1840 | pd->mode_offset = (buffer[6] << 8) | (buffer[7] & 0xff); |
| 1841 | if (size > sizeof(buffer)) |
| 1842 | size = sizeof(buffer); |
| 1843 | |
| 1844 | /* |
| 1845 | * now get it all |
| 1846 | */ |
| 1847 | init_cdrom_command(&cgc, buffer, size, CGC_DATA_READ); |
| 1848 | cgc.sense = &sense; |
| 1849 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WRITE_PARMS_PAGE, 0))) { |
| 1850 | pkt_dump_sense(&cgc); |
| 1851 | return ret; |
| 1852 | } |
| 1853 | |
| 1854 | /* |
| 1855 | * write page is offset header + block descriptor length |
| 1856 | */ |
| 1857 | wp = (write_param_page *) &buffer[sizeof(struct mode_page_header) + pd->mode_offset]; |
| 1858 | |
| 1859 | wp->fp = pd->settings.fp; |
| 1860 | wp->track_mode = pd->settings.track_mode; |
| 1861 | wp->write_type = pd->settings.write_type; |
| 1862 | wp->data_block_type = pd->settings.block_mode; |
| 1863 | |
| 1864 | wp->multi_session = 0; |
| 1865 | |
| 1866 | #ifdef PACKET_USE_LS |
| 1867 | wp->link_size = 7; |
| 1868 | wp->ls_v = 1; |
| 1869 | #endif |
| 1870 | |
| 1871 | if (wp->data_block_type == PACKET_BLOCK_MODE1) { |
| 1872 | wp->session_format = 0; |
| 1873 | wp->subhdr2 = 0x20; |
| 1874 | } else if (wp->data_block_type == PACKET_BLOCK_MODE2) { |
| 1875 | wp->session_format = 0x20; |
| 1876 | wp->subhdr2 = 8; |
| 1877 | #if 0 |
| 1878 | wp->mcn[0] = 0x80; |
| 1879 | memcpy(&wp->mcn[1], PACKET_MCN, sizeof(wp->mcn) - 1); |
| 1880 | #endif |
| 1881 | } else { |
| 1882 | /* |
| 1883 | * paranoia |
| 1884 | */ |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1885 | printk(DRIVER_NAME": write mode wrong %d\n", wp->data_block_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | return 1; |
| 1887 | } |
| 1888 | wp->packet_size = cpu_to_be32(pd->settings.size >> 2); |
| 1889 | |
| 1890 | cgc.buflen = cgc.cmd[8] = size; |
| 1891 | if ((ret = pkt_mode_select(pd, &cgc))) { |
| 1892 | pkt_dump_sense(&cgc); |
| 1893 | return ret; |
| 1894 | } |
| 1895 | |
| 1896 | pkt_print_settings(pd); |
| 1897 | return 0; |
| 1898 | } |
| 1899 | |
| 1900 | /* |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1901 | * 1 -- we can write to this track, 0 -- we can't |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | */ |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1903 | static int pkt_writable_track(struct pktcdvd_device *pd, track_information *ti) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | { |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1905 | switch (pd->mmc3_profile) { |
| 1906 | case 0x1a: /* DVD+RW */ |
| 1907 | case 0x12: /* DVD-RAM */ |
| 1908 | /* The track is always writable on DVD+RW/DVD-RAM */ |
| 1909 | return 1; |
| 1910 | default: |
| 1911 | break; |
| 1912 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1914 | if (!ti->packet || !ti->fp) |
| 1915 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | |
| 1917 | /* |
| 1918 | * "good" settings as per Mt Fuji. |
| 1919 | */ |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1920 | if (ti->rt == 0 && ti->blank == 0) |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1921 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1923 | if (ti->rt == 0 && ti->blank == 1) |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1924 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 1926 | if (ti->rt == 1 && ti->blank == 0) |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1927 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1929 | printk(DRIVER_NAME": bad state %d-%d-%d\n", ti->rt, ti->blank, ti->packet); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1930 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | } |
| 1932 | |
| 1933 | /* |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1934 | * 1 -- we can write to this disc, 0 -- we can't |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | */ |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1936 | static int pkt_writable_disc(struct pktcdvd_device *pd, disc_information *di) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | { |
| 1938 | switch (pd->mmc3_profile) { |
| 1939 | case 0x0a: /* CD-RW */ |
| 1940 | case 0xffff: /* MMC3 not supported */ |
| 1941 | break; |
| 1942 | case 0x1a: /* DVD+RW */ |
| 1943 | case 0x13: /* DVD-RW */ |
| 1944 | case 0x12: /* DVD-RAM */ |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1945 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | default: |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1947 | VPRINTK(DRIVER_NAME": Wrong disc profile (%x)\n", pd->mmc3_profile); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1948 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | } |
| 1950 | |
| 1951 | /* |
| 1952 | * for disc type 0xff we should probably reserve a new track. |
| 1953 | * but i'm not sure, should we leave this to user apps? probably. |
| 1954 | */ |
| 1955 | if (di->disc_type == 0xff) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1956 | printk(DRIVER_NAME": Unknown disc. No track?\n"); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1957 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | } |
| 1959 | |
| 1960 | if (di->disc_type != 0x20 && di->disc_type != 0) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1961 | printk(DRIVER_NAME": Wrong disc type (%x)\n", di->disc_type); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1962 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1963 | } |
| 1964 | |
| 1965 | if (di->erasable == 0) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1966 | printk(DRIVER_NAME": Disc not erasable\n"); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1967 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | } |
| 1969 | |
| 1970 | if (di->border_status == PACKET_SESSION_RESERVED) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 1971 | printk(DRIVER_NAME": Can't write to last track (reserved)\n"); |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1972 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | } |
| 1974 | |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 1975 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | } |
| 1977 | |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 1978 | static noinline_for_stack int pkt_probe_settings(struct pktcdvd_device *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | { |
| 1980 | struct packet_command cgc; |
| 1981 | unsigned char buf[12]; |
| 1982 | disc_information di; |
| 1983 | track_information ti; |
| 1984 | int ret, track; |
| 1985 | |
| 1986 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
| 1987 | cgc.cmd[0] = GPCMD_GET_CONFIGURATION; |
| 1988 | cgc.cmd[8] = 8; |
| 1989 | ret = pkt_generic_packet(pd, &cgc); |
| 1990 | pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7]; |
| 1991 | |
| 1992 | memset(&di, 0, sizeof(disc_information)); |
| 1993 | memset(&ti, 0, sizeof(track_information)); |
| 1994 | |
| 1995 | if ((ret = pkt_get_disc_info(pd, &di))) { |
| 1996 | printk("failed get_disc\n"); |
| 1997 | return ret; |
| 1998 | } |
| 1999 | |
Peter Osterlund | 7c613d5 | 2006-02-20 18:28:02 -0800 | [diff] [blame] | 2000 | if (!pkt_writable_disc(pd, &di)) |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 2001 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | pd->type = di.erasable ? PACKET_CDRW : PACKET_CDR; |
| 2004 | |
| 2005 | track = 1; /* (di.last_track_msb << 8) | di.last_track_lsb; */ |
| 2006 | if ((ret = pkt_get_track_info(pd, track, 1, &ti))) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2007 | printk(DRIVER_NAME": failed get_track\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | return ret; |
| 2009 | } |
| 2010 | |
Peter Osterlund | ab863ec | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 2011 | if (!pkt_writable_track(pd, &ti)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2012 | printk(DRIVER_NAME": can't write to this track\n"); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 2013 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | } |
| 2015 | |
| 2016 | /* |
| 2017 | * we keep packet size in 512 byte units, makes it easier to |
| 2018 | * deal with request calculations. |
| 2019 | */ |
| 2020 | pd->settings.size = be32_to_cpu(ti.fixed_packet_size) << 2; |
| 2021 | if (pd->settings.size == 0) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2022 | printk(DRIVER_NAME": detected zero packet size!\n"); |
Phillip Susi | a460ad6 | 2006-02-04 23:27:44 -0800 | [diff] [blame] | 2023 | return -ENXIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | } |
Peter Osterlund | d0272e7 | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 2025 | if (pd->settings.size > PACKET_MAX_SECTORS) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2026 | printk(DRIVER_NAME": packet size is too big\n"); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 2027 | return -EROFS; |
Peter Osterlund | d0272e7 | 2005-09-13 01:25:27 -0700 | [diff] [blame] | 2028 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | pd->settings.fp = ti.fp; |
| 2030 | pd->offset = (be32_to_cpu(ti.track_start) << 2) & (pd->settings.size - 1); |
| 2031 | |
| 2032 | if (ti.nwa_v) { |
| 2033 | pd->nwa = be32_to_cpu(ti.next_writable); |
| 2034 | set_bit(PACKET_NWA_VALID, &pd->flags); |
| 2035 | } |
| 2036 | |
| 2037 | /* |
| 2038 | * in theory we could use lra on -RW media as well and just zero |
| 2039 | * blocks that haven't been written yet, but in practice that |
| 2040 | * is just a no-go. we'll use that for -R, naturally. |
| 2041 | */ |
| 2042 | if (ti.lra_v) { |
| 2043 | pd->lra = be32_to_cpu(ti.last_rec_address); |
| 2044 | set_bit(PACKET_LRA_VALID, &pd->flags); |
| 2045 | } else { |
| 2046 | pd->lra = 0xffffffff; |
| 2047 | set_bit(PACKET_LRA_VALID, &pd->flags); |
| 2048 | } |
| 2049 | |
| 2050 | /* |
| 2051 | * fine for now |
| 2052 | */ |
| 2053 | pd->settings.link_loss = 7; |
| 2054 | pd->settings.write_type = 0; /* packet */ |
| 2055 | pd->settings.track_mode = ti.track_mode; |
| 2056 | |
| 2057 | /* |
| 2058 | * mode1 or mode2 disc |
| 2059 | */ |
| 2060 | switch (ti.data_mode) { |
| 2061 | case PACKET_MODE1: |
| 2062 | pd->settings.block_mode = PACKET_BLOCK_MODE1; |
| 2063 | break; |
| 2064 | case PACKET_MODE2: |
| 2065 | pd->settings.block_mode = PACKET_BLOCK_MODE2; |
| 2066 | break; |
| 2067 | default: |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2068 | printk(DRIVER_NAME": unknown data mode\n"); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 2069 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | } |
| 2071 | return 0; |
| 2072 | } |
| 2073 | |
| 2074 | /* |
| 2075 | * enable/disable write caching on drive |
| 2076 | */ |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 2077 | static noinline_for_stack int pkt_write_caching(struct pktcdvd_device *pd, |
| 2078 | int set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2079 | { |
| 2080 | struct packet_command cgc; |
| 2081 | struct request_sense sense; |
| 2082 | unsigned char buf[64]; |
| 2083 | int ret; |
| 2084 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_READ); |
| 2086 | cgc.sense = &sense; |
| 2087 | cgc.buflen = pd->mode_offset + 12; |
| 2088 | |
| 2089 | /* |
| 2090 | * caching mode page might not be there, so quiet this command |
| 2091 | */ |
| 2092 | cgc.quiet = 1; |
| 2093 | |
| 2094 | if ((ret = pkt_mode_sense(pd, &cgc, GPMODE_WCACHING_PAGE, 0))) |
| 2095 | return ret; |
| 2096 | |
| 2097 | buf[pd->mode_offset + 10] |= (!!set << 2); |
| 2098 | |
| 2099 | cgc.buflen = cgc.cmd[8] = 2 + ((buf[0] << 8) | (buf[1] & 0xff)); |
| 2100 | ret = pkt_mode_select(pd, &cgc); |
| 2101 | if (ret) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2102 | printk(DRIVER_NAME": write caching control failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | pkt_dump_sense(&cgc); |
| 2104 | } else if (!ret && set) |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2105 | printk(DRIVER_NAME": enabled write caching on %s\n", pd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | return ret; |
| 2107 | } |
| 2108 | |
| 2109 | static int pkt_lock_door(struct pktcdvd_device *pd, int lockflag) |
| 2110 | { |
| 2111 | struct packet_command cgc; |
| 2112 | |
| 2113 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 2114 | cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL; |
| 2115 | cgc.cmd[4] = lockflag ? 1 : 0; |
| 2116 | return pkt_generic_packet(pd, &cgc); |
| 2117 | } |
| 2118 | |
| 2119 | /* |
| 2120 | * Returns drive maximum write speed |
| 2121 | */ |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 2122 | static noinline_for_stack int pkt_get_max_speed(struct pktcdvd_device *pd, |
| 2123 | unsigned *write_speed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | { |
| 2125 | struct packet_command cgc; |
| 2126 | struct request_sense sense; |
| 2127 | unsigned char buf[256+18]; |
| 2128 | unsigned char *cap_buf; |
| 2129 | int ret, offset; |
| 2130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | cap_buf = &buf[sizeof(struct mode_page_header) + pd->mode_offset]; |
| 2132 | init_cdrom_command(&cgc, buf, sizeof(buf), CGC_DATA_UNKNOWN); |
| 2133 | cgc.sense = &sense; |
| 2134 | |
| 2135 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); |
| 2136 | if (ret) { |
| 2137 | cgc.buflen = pd->mode_offset + cap_buf[1] + 2 + |
| 2138 | sizeof(struct mode_page_header); |
| 2139 | ret = pkt_mode_sense(pd, &cgc, GPMODE_CAPABILITIES_PAGE, 0); |
| 2140 | if (ret) { |
| 2141 | pkt_dump_sense(&cgc); |
| 2142 | return ret; |
| 2143 | } |
| 2144 | } |
| 2145 | |
| 2146 | offset = 20; /* Obsoleted field, used by older drives */ |
| 2147 | if (cap_buf[1] >= 28) |
| 2148 | offset = 28; /* Current write speed selected */ |
| 2149 | if (cap_buf[1] >= 30) { |
| 2150 | /* If the drive reports at least one "Logical Unit Write |
| 2151 | * Speed Performance Descriptor Block", use the information |
| 2152 | * in the first block. (contains the highest speed) |
| 2153 | */ |
| 2154 | int num_spdb = (cap_buf[30] << 8) + cap_buf[31]; |
| 2155 | if (num_spdb > 0) |
| 2156 | offset = 34; |
| 2157 | } |
| 2158 | |
| 2159 | *write_speed = (cap_buf[offset] << 8) | cap_buf[offset + 1]; |
| 2160 | return 0; |
| 2161 | } |
| 2162 | |
| 2163 | /* These tables from cdrecord - I don't have orange book */ |
| 2164 | /* standard speed CD-RW (1-4x) */ |
| 2165 | static char clv_to_speed[16] = { |
| 2166 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
| 2167 | 0, 2, 4, 6, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| 2168 | }; |
| 2169 | /* high speed CD-RW (-10x) */ |
| 2170 | static char hs_clv_to_speed[16] = { |
| 2171 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
| 2172 | 0, 2, 4, 6, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
| 2173 | }; |
| 2174 | /* ultra high speed CD-RW */ |
| 2175 | static char us_clv_to_speed[16] = { |
| 2176 | /* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 */ |
| 2177 | 0, 2, 4, 8, 0, 0,16, 0,24,32,40,48, 0, 0, 0, 0 |
| 2178 | }; |
| 2179 | |
| 2180 | /* |
| 2181 | * reads the maximum media speed from ATIP |
| 2182 | */ |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 2183 | static noinline_for_stack int pkt_media_speed(struct pktcdvd_device *pd, |
| 2184 | unsigned *speed) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | { |
| 2186 | struct packet_command cgc; |
| 2187 | struct request_sense sense; |
| 2188 | unsigned char buf[64]; |
| 2189 | unsigned int size, st, sp; |
| 2190 | int ret; |
| 2191 | |
| 2192 | init_cdrom_command(&cgc, buf, 2, CGC_DATA_READ); |
| 2193 | cgc.sense = &sense; |
| 2194 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
| 2195 | cgc.cmd[1] = 2; |
| 2196 | cgc.cmd[2] = 4; /* READ ATIP */ |
| 2197 | cgc.cmd[8] = 2; |
| 2198 | ret = pkt_generic_packet(pd, &cgc); |
| 2199 | if (ret) { |
| 2200 | pkt_dump_sense(&cgc); |
| 2201 | return ret; |
| 2202 | } |
| 2203 | size = ((unsigned int) buf[0]<<8) + buf[1] + 2; |
| 2204 | if (size > sizeof(buf)) |
| 2205 | size = sizeof(buf); |
| 2206 | |
| 2207 | init_cdrom_command(&cgc, buf, size, CGC_DATA_READ); |
| 2208 | cgc.sense = &sense; |
| 2209 | cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP; |
| 2210 | cgc.cmd[1] = 2; |
| 2211 | cgc.cmd[2] = 4; |
| 2212 | cgc.cmd[8] = size; |
| 2213 | ret = pkt_generic_packet(pd, &cgc); |
| 2214 | if (ret) { |
| 2215 | pkt_dump_sense(&cgc); |
| 2216 | return ret; |
| 2217 | } |
| 2218 | |
Alexey Dobriyan | eaa0ff1 | 2008-02-06 01:36:06 -0800 | [diff] [blame] | 2219 | if (!(buf[6] & 0x40)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2220 | printk(DRIVER_NAME": Disc type is not CD-RW\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | return 1; |
| 2222 | } |
Alexey Dobriyan | eaa0ff1 | 2008-02-06 01:36:06 -0800 | [diff] [blame] | 2223 | if (!(buf[6] & 0x4)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2224 | printk(DRIVER_NAME": A1 values on media are not valid, maybe not CDRW?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2225 | return 1; |
| 2226 | } |
| 2227 | |
| 2228 | st = (buf[6] >> 3) & 0x7; /* disc sub-type */ |
| 2229 | |
| 2230 | sp = buf[16] & 0xf; /* max speed from ATIP A1 field */ |
| 2231 | |
| 2232 | /* Info from cdrecord */ |
| 2233 | switch (st) { |
| 2234 | case 0: /* standard speed */ |
| 2235 | *speed = clv_to_speed[sp]; |
| 2236 | break; |
| 2237 | case 1: /* high speed */ |
| 2238 | *speed = hs_clv_to_speed[sp]; |
| 2239 | break; |
| 2240 | case 2: /* ultra high speed */ |
| 2241 | *speed = us_clv_to_speed[sp]; |
| 2242 | break; |
| 2243 | default: |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2244 | printk(DRIVER_NAME": Unknown disc sub-type %d\n",st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | return 1; |
| 2246 | } |
| 2247 | if (*speed) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2248 | printk(DRIVER_NAME": Max. media speed: %d\n",*speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | return 0; |
| 2250 | } else { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2251 | printk(DRIVER_NAME": Unknown speed %d for sub-type %d\n",sp,st); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | return 1; |
| 2253 | } |
| 2254 | } |
| 2255 | |
Peter Osterlund | 05680d8 | 2008-03-04 14:28:41 -0800 | [diff] [blame] | 2256 | static noinline_for_stack int pkt_perform_opc(struct pktcdvd_device *pd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | { |
| 2258 | struct packet_command cgc; |
| 2259 | struct request_sense sense; |
| 2260 | int ret; |
| 2261 | |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2262 | VPRINTK(DRIVER_NAME": Performing OPC\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | |
| 2264 | init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE); |
| 2265 | cgc.sense = &sense; |
| 2266 | cgc.timeout = 60*HZ; |
| 2267 | cgc.cmd[0] = GPCMD_SEND_OPC; |
| 2268 | cgc.cmd[1] = 1; |
| 2269 | if ((ret = pkt_generic_packet(pd, &cgc))) |
| 2270 | pkt_dump_sense(&cgc); |
| 2271 | return ret; |
| 2272 | } |
| 2273 | |
| 2274 | static int pkt_open_write(struct pktcdvd_device *pd) |
| 2275 | { |
| 2276 | int ret; |
| 2277 | unsigned int write_speed, media_write_speed, read_speed; |
| 2278 | |
| 2279 | if ((ret = pkt_probe_settings(pd))) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2280 | VPRINTK(DRIVER_NAME": %s failed probe\n", pd->name); |
Peter Osterlund | 9db9154 | 2006-02-20 18:28:04 -0800 | [diff] [blame] | 2281 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | } |
| 2283 | |
| 2284 | if ((ret = pkt_set_write_settings(pd))) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2285 | DPRINTK(DRIVER_NAME": %s failed saving write settings\n", pd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | return -EIO; |
| 2287 | } |
| 2288 | |
| 2289 | pkt_write_caching(pd, USE_WCACHING); |
| 2290 | |
| 2291 | if ((ret = pkt_get_max_speed(pd, &write_speed))) |
| 2292 | write_speed = 16 * 177; |
| 2293 | switch (pd->mmc3_profile) { |
| 2294 | case 0x13: /* DVD-RW */ |
| 2295 | case 0x1a: /* DVD+RW */ |
| 2296 | case 0x12: /* DVD-RAM */ |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2297 | DPRINTK(DRIVER_NAME": write speed %ukB/s\n", write_speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | break; |
| 2299 | default: |
| 2300 | if ((ret = pkt_media_speed(pd, &media_write_speed))) |
| 2301 | media_write_speed = 16; |
| 2302 | write_speed = min(write_speed, media_write_speed * 177); |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2303 | DPRINTK(DRIVER_NAME": write speed %ux\n", write_speed / 176); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | break; |
| 2305 | } |
| 2306 | read_speed = write_speed; |
| 2307 | |
| 2308 | if ((ret = pkt_set_speed(pd, write_speed, read_speed))) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2309 | DPRINTK(DRIVER_NAME": %s couldn't set write speed\n", pd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2310 | return -EIO; |
| 2311 | } |
| 2312 | pd->write_speed = write_speed; |
| 2313 | pd->read_speed = read_speed; |
| 2314 | |
| 2315 | if ((ret = pkt_perform_opc(pd))) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2316 | DPRINTK(DRIVER_NAME": %s Optimum Power Calibration failed\n", pd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | } |
| 2318 | |
| 2319 | return 0; |
| 2320 | } |
| 2321 | |
| 2322 | /* |
| 2323 | * called at open time. |
| 2324 | */ |
| 2325 | static int pkt_open_dev(struct pktcdvd_device *pd, int write) |
| 2326 | { |
| 2327 | int ret; |
| 2328 | long lba; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2329 | struct request_queue *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | |
| 2331 | /* |
| 2332 | * We need to re-open the cdrom device without O_NONBLOCK to be able |
| 2333 | * to read/write from/to it. It is already opened in O_NONBLOCK mode |
| 2334 | * so bdget() can't fail. |
| 2335 | */ |
| 2336 | bdget(pd->bdev->bd_dev); |
| 2337 | if ((ret = blkdev_get(pd->bdev, FMODE_READ, O_RDONLY))) |
| 2338 | goto out; |
| 2339 | |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 2340 | if ((ret = bd_claim(pd->bdev, pd))) |
| 2341 | goto out_putdev; |
| 2342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | if ((ret = pkt_get_last_written(pd, &lba))) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2344 | printk(DRIVER_NAME": pkt_get_last_written failed\n"); |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 2345 | goto out_unclaim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | } |
| 2347 | |
| 2348 | set_capacity(pd->disk, lba << 2); |
| 2349 | set_capacity(pd->bdev->bd_disk, lba << 2); |
| 2350 | bd_set_size(pd->bdev, (loff_t)lba << 11); |
| 2351 | |
| 2352 | q = bdev_get_queue(pd->bdev); |
| 2353 | if (write) { |
| 2354 | if ((ret = pkt_open_write(pd))) |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 2355 | goto out_unclaim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | /* |
| 2357 | * Some CDRW drives can not handle writes larger than one packet, |
| 2358 | * even if the size is a multiple of the packet size. |
| 2359 | */ |
| 2360 | spin_lock_irq(q->queue_lock); |
| 2361 | blk_queue_max_sectors(q, pd->settings.size); |
| 2362 | spin_unlock_irq(q->queue_lock); |
| 2363 | set_bit(PACKET_WRITABLE, &pd->flags); |
| 2364 | } else { |
| 2365 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
| 2366 | clear_bit(PACKET_WRITABLE, &pd->flags); |
| 2367 | } |
| 2368 | |
| 2369 | if ((ret = pkt_set_segment_merging(pd, q))) |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 2370 | goto out_unclaim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2371 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2372 | if (write) { |
| 2373 | if (!pkt_grow_pktlist(pd, CONFIG_CDROM_PKTCDVD_BUFFERS)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2374 | printk(DRIVER_NAME": not enough memory for buffers\n"); |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2375 | ret = -ENOMEM; |
| 2376 | goto out_unclaim; |
| 2377 | } |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2378 | printk(DRIVER_NAME": %lukB available on disc\n", lba << 1); |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2379 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2380 | |
| 2381 | return 0; |
| 2382 | |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 2383 | out_unclaim: |
| 2384 | bd_release(pd->bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | out_putdev: |
| 2386 | blkdev_put(pd->bdev); |
| 2387 | out: |
| 2388 | return ret; |
| 2389 | } |
| 2390 | |
| 2391 | /* |
| 2392 | * called when the device is closed. makes sure that the device flushes |
| 2393 | * the internal cache before we close. |
| 2394 | */ |
| 2395 | static void pkt_release_dev(struct pktcdvd_device *pd, int flush) |
| 2396 | { |
| 2397 | if (flush && pkt_flush_cache(pd)) |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2398 | DPRINTK(DRIVER_NAME": %s not flushing cache\n", pd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | |
| 2400 | pkt_lock_door(pd, 0); |
| 2401 | |
| 2402 | pkt_set_speed(pd, MAX_SPEED, MAX_SPEED); |
Peter Osterlund | 8382bf2 | 2006-01-08 01:02:17 -0800 | [diff] [blame] | 2403 | bd_release(pd->bdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | blkdev_put(pd->bdev); |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2405 | |
| 2406 | pkt_shrink_pktlist(pd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | } |
| 2408 | |
| 2409 | static struct pktcdvd_device *pkt_find_dev_from_minor(int dev_minor) |
| 2410 | { |
| 2411 | if (dev_minor >= MAX_WRITERS) |
| 2412 | return NULL; |
| 2413 | return pkt_devs[dev_minor]; |
| 2414 | } |
| 2415 | |
| 2416 | static int pkt_open(struct inode *inode, struct file *file) |
| 2417 | { |
| 2418 | struct pktcdvd_device *pd = NULL; |
| 2419 | int ret; |
| 2420 | |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2421 | VPRINTK(DRIVER_NAME": entering open\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2423 | mutex_lock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | pd = pkt_find_dev_from_minor(iminor(inode)); |
| 2425 | if (!pd) { |
| 2426 | ret = -ENODEV; |
| 2427 | goto out; |
| 2428 | } |
| 2429 | BUG_ON(pd->refcnt < 0); |
| 2430 | |
| 2431 | pd->refcnt++; |
Peter Osterlund | 46f4e1b | 2005-05-20 13:59:06 -0700 | [diff] [blame] | 2432 | if (pd->refcnt > 1) { |
| 2433 | if ((file->f_mode & FMODE_WRITE) && |
| 2434 | !test_bit(PACKET_WRITABLE, &pd->flags)) { |
| 2435 | ret = -EBUSY; |
| 2436 | goto out_dec; |
| 2437 | } |
| 2438 | } else { |
Peter Osterlund | 01fd9fd | 2006-02-14 13:52:55 -0800 | [diff] [blame] | 2439 | ret = pkt_open_dev(pd, file->f_mode & FMODE_WRITE); |
| 2440 | if (ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | goto out_dec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | /* |
| 2443 | * needed here as well, since ext2 (among others) may change |
| 2444 | * the blocksize at mount time |
| 2445 | */ |
| 2446 | set_blocksize(inode->i_bdev, CD_FRAMESIZE); |
| 2447 | } |
| 2448 | |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2449 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | return 0; |
| 2451 | |
| 2452 | out_dec: |
| 2453 | pd->refcnt--; |
| 2454 | out: |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2455 | VPRINTK(DRIVER_NAME": failed open (%d)\n", ret); |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2456 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | return ret; |
| 2458 | } |
| 2459 | |
| 2460 | static int pkt_close(struct inode *inode, struct file *file) |
| 2461 | { |
| 2462 | struct pktcdvd_device *pd = inode->i_bdev->bd_disk->private_data; |
| 2463 | int ret = 0; |
| 2464 | |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2465 | mutex_lock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2466 | pd->refcnt--; |
| 2467 | BUG_ON(pd->refcnt < 0); |
| 2468 | if (pd->refcnt == 0) { |
| 2469 | int flush = test_bit(PACKET_WRITABLE, &pd->flags); |
| 2470 | pkt_release_dev(pd, flush); |
| 2471 | } |
Jes Sorensen | 1657f82 | 2006-03-23 03:00:25 -0800 | [diff] [blame] | 2472 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | return ret; |
| 2474 | } |
| 2475 | |
| 2476 | |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 2477 | static void pkt_end_io_read_cloned(struct bio *bio, int err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | { |
| 2479 | struct packet_stacked_data *psd = bio->bi_private; |
| 2480 | struct pktcdvd_device *pd = psd->pd; |
| 2481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2482 | bio_put(bio); |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 2483 | bio_endio(psd->bio, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | mempool_free(psd, psd_pool); |
| 2485 | pkt_bio_finished(pd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | } |
| 2487 | |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2488 | static int pkt_make_request(struct request_queue *q, struct bio *bio) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2489 | { |
| 2490 | struct pktcdvd_device *pd; |
| 2491 | char b[BDEVNAME_SIZE]; |
| 2492 | sector_t zone; |
| 2493 | struct packet_data *pkt; |
| 2494 | int was_empty, blocked_bio; |
| 2495 | struct pkt_rb_node *node; |
| 2496 | |
| 2497 | pd = q->queuedata; |
| 2498 | if (!pd) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2499 | printk(DRIVER_NAME": %s incorrect request queue\n", bdevname(bio->bi_bdev, b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2500 | goto end_io; |
| 2501 | } |
| 2502 | |
| 2503 | /* |
| 2504 | * Clone READ bios so we can have our own bi_end_io callback. |
| 2505 | */ |
| 2506 | if (bio_data_dir(bio) == READ) { |
| 2507 | struct bio *cloned_bio = bio_clone(bio, GFP_NOIO); |
| 2508 | struct packet_stacked_data *psd = mempool_alloc(psd_pool, GFP_NOIO); |
| 2509 | |
| 2510 | psd->pd = pd; |
| 2511 | psd->bio = bio; |
| 2512 | cloned_bio->bi_bdev = pd->bdev; |
| 2513 | cloned_bio->bi_private = psd; |
| 2514 | cloned_bio->bi_end_io = pkt_end_io_read_cloned; |
| 2515 | pd->stats.secs_r += bio->bi_size >> 9; |
Peter Osterlund | 46c271b | 2005-06-23 00:10:02 -0700 | [diff] [blame] | 2516 | pkt_queue_bio(pd, cloned_bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | return 0; |
| 2518 | } |
| 2519 | |
| 2520 | if (!test_bit(PACKET_WRITABLE, &pd->flags)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2521 | printk(DRIVER_NAME": WRITE for ro device %s (%llu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2522 | pd->name, (unsigned long long)bio->bi_sector); |
| 2523 | goto end_io; |
| 2524 | } |
| 2525 | |
| 2526 | if (!bio->bi_size || (bio->bi_size % CD_FRAMESIZE)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2527 | printk(DRIVER_NAME": wrong bio size\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | goto end_io; |
| 2529 | } |
| 2530 | |
| 2531 | blk_queue_bounce(q, &bio); |
| 2532 | |
| 2533 | zone = ZONE(bio->bi_sector, pd); |
| 2534 | VPRINTK("pkt_make_request: start = %6llx stop = %6llx\n", |
| 2535 | (unsigned long long)bio->bi_sector, |
| 2536 | (unsigned long long)(bio->bi_sector + bio_sectors(bio))); |
| 2537 | |
| 2538 | /* Check if we have to split the bio */ |
| 2539 | { |
| 2540 | struct bio_pair *bp; |
| 2541 | sector_t last_zone; |
| 2542 | int first_sectors; |
| 2543 | |
| 2544 | last_zone = ZONE(bio->bi_sector + bio_sectors(bio) - 1, pd); |
| 2545 | if (last_zone != zone) { |
| 2546 | BUG_ON(last_zone != zone + pd->settings.size); |
| 2547 | first_sectors = last_zone - bio->bi_sector; |
| 2548 | bp = bio_split(bio, bio_split_pool, first_sectors); |
| 2549 | BUG_ON(!bp); |
| 2550 | pkt_make_request(q, &bp->bio1); |
| 2551 | pkt_make_request(q, &bp->bio2); |
| 2552 | bio_pair_release(bp); |
| 2553 | return 0; |
| 2554 | } |
| 2555 | } |
| 2556 | |
| 2557 | /* |
| 2558 | * If we find a matching packet in state WAITING or READ_WAIT, we can |
| 2559 | * just append this bio to that packet. |
| 2560 | */ |
| 2561 | spin_lock(&pd->cdrw.active_list_lock); |
| 2562 | blocked_bio = 0; |
| 2563 | list_for_each_entry(pkt, &pd->cdrw.pkt_active_list, list) { |
| 2564 | if (pkt->sector == zone) { |
| 2565 | spin_lock(&pkt->lock); |
| 2566 | if ((pkt->state == PACKET_WAITING_STATE) || |
| 2567 | (pkt->state == PACKET_READ_WAIT_STATE)) { |
| 2568 | pkt_add_list_last(bio, &pkt->orig_bios, |
| 2569 | &pkt->orig_bios_tail); |
| 2570 | pkt->write_size += bio->bi_size / CD_FRAMESIZE; |
| 2571 | if ((pkt->write_size >= pkt->frames) && |
| 2572 | (pkt->state == PACKET_WAITING_STATE)) { |
| 2573 | atomic_inc(&pkt->run_sm); |
| 2574 | wake_up(&pd->wqueue); |
| 2575 | } |
| 2576 | spin_unlock(&pkt->lock); |
| 2577 | spin_unlock(&pd->cdrw.active_list_lock); |
| 2578 | return 0; |
| 2579 | } else { |
| 2580 | blocked_bio = 1; |
| 2581 | } |
| 2582 | spin_unlock(&pkt->lock); |
| 2583 | } |
| 2584 | } |
| 2585 | spin_unlock(&pd->cdrw.active_list_lock); |
| 2586 | |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 2587 | /* |
| 2588 | * Test if there is enough room left in the bio work queue |
| 2589 | * (queue size >= congestion on mark). |
| 2590 | * If not, wait till the work queue size is below the congestion off mark. |
| 2591 | */ |
| 2592 | spin_lock(&pd->lock); |
| 2593 | if (pd->write_congestion_on > 0 |
| 2594 | && pd->bio_queue_size >= pd->write_congestion_on) { |
Thomas Maier | 83f3aa3 | 2007-02-10 01:45:11 -0800 | [diff] [blame] | 2595 | set_bdi_congested(&q->backing_dev_info, WRITE); |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 2596 | do { |
| 2597 | spin_unlock(&pd->lock); |
| 2598 | congestion_wait(WRITE, HZ); |
| 2599 | spin_lock(&pd->lock); |
| 2600 | } while(pd->bio_queue_size > pd->write_congestion_off); |
| 2601 | } |
| 2602 | spin_unlock(&pd->lock); |
| 2603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2604 | /* |
| 2605 | * No matching packet found. Store the bio in the work queue. |
| 2606 | */ |
| 2607 | node = mempool_alloc(pd->rb_pool, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | node->bio = bio; |
| 2609 | spin_lock(&pd->lock); |
| 2610 | BUG_ON(pd->bio_queue_size < 0); |
| 2611 | was_empty = (pd->bio_queue_size == 0); |
| 2612 | pkt_rbtree_insert(pd, node); |
| 2613 | spin_unlock(&pd->lock); |
| 2614 | |
| 2615 | /* |
| 2616 | * Wake up the worker thread. |
| 2617 | */ |
| 2618 | atomic_set(&pd->scan_queue, 1); |
| 2619 | if (was_empty) { |
| 2620 | /* This wake_up is required for correct operation */ |
| 2621 | wake_up(&pd->wqueue); |
| 2622 | } else if (!list_empty(&pd->cdrw.pkt_free_list) && !blocked_bio) { |
| 2623 | /* |
| 2624 | * This wake up is not required for correct operation, |
| 2625 | * but improves performance in some cases. |
| 2626 | */ |
| 2627 | wake_up(&pd->wqueue); |
| 2628 | } |
| 2629 | return 0; |
| 2630 | end_io: |
NeilBrown | 6712ecf | 2007-09-27 12:47:43 +0200 | [diff] [blame] | 2631 | bio_io_error(bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | return 0; |
| 2633 | } |
| 2634 | |
| 2635 | |
| 2636 | |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 2637 | static int pkt_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
| 2638 | struct bio_vec *bvec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | { |
| 2640 | struct pktcdvd_device *pd = q->queuedata; |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 2641 | sector_t zone = ZONE(bmd->bi_sector, pd); |
| 2642 | int used = ((bmd->bi_sector - zone) << 9) + bmd->bi_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | int remaining = (pd->settings.size << 9) - used; |
| 2644 | int remaining2; |
| 2645 | |
| 2646 | /* |
| 2647 | * A bio <= PAGE_SIZE must be allowed. If it crosses a packet |
| 2648 | * boundary, pkt_make_request() will split the bio. |
| 2649 | */ |
Alasdair G Kergon | cc371e6 | 2008-07-03 09:53:43 +0200 | [diff] [blame] | 2650 | remaining2 = PAGE_SIZE - bmd->bi_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | remaining = max(remaining, remaining2); |
| 2652 | |
| 2653 | BUG_ON(remaining < 0); |
| 2654 | return remaining; |
| 2655 | } |
| 2656 | |
| 2657 | static void pkt_init_queue(struct pktcdvd_device *pd) |
| 2658 | { |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 2659 | struct request_queue *q = pd->disk->queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2660 | |
| 2661 | blk_queue_make_request(q, pkt_make_request); |
| 2662 | blk_queue_hardsect_size(q, CD_FRAMESIZE); |
| 2663 | blk_queue_max_sectors(q, PACKET_MAX_SECTORS); |
| 2664 | blk_queue_merge_bvec(q, pkt_merge_bvec); |
| 2665 | q->queuedata = pd; |
| 2666 | } |
| 2667 | |
| 2668 | static int pkt_seq_show(struct seq_file *m, void *p) |
| 2669 | { |
| 2670 | struct pktcdvd_device *pd = m->private; |
| 2671 | char *msg; |
| 2672 | char bdev_buf[BDEVNAME_SIZE]; |
| 2673 | int states[PACKET_NUM_STATES]; |
| 2674 | |
| 2675 | seq_printf(m, "Writer %s mapped to %s:\n", pd->name, |
| 2676 | bdevname(pd->bdev, bdev_buf)); |
| 2677 | |
| 2678 | seq_printf(m, "\nSettings:\n"); |
| 2679 | seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2); |
| 2680 | |
| 2681 | if (pd->settings.write_type == 0) |
| 2682 | msg = "Packet"; |
| 2683 | else |
| 2684 | msg = "Unknown"; |
| 2685 | seq_printf(m, "\twrite type:\t\t%s\n", msg); |
| 2686 | |
| 2687 | seq_printf(m, "\tpacket type:\t\t%s\n", pd->settings.fp ? "Fixed" : "Variable"); |
| 2688 | seq_printf(m, "\tlink loss:\t\t%d\n", pd->settings.link_loss); |
| 2689 | |
| 2690 | seq_printf(m, "\ttrack mode:\t\t%d\n", pd->settings.track_mode); |
| 2691 | |
| 2692 | if (pd->settings.block_mode == PACKET_BLOCK_MODE1) |
| 2693 | msg = "Mode 1"; |
| 2694 | else if (pd->settings.block_mode == PACKET_BLOCK_MODE2) |
| 2695 | msg = "Mode 2"; |
| 2696 | else |
| 2697 | msg = "Unknown"; |
| 2698 | seq_printf(m, "\tblock mode:\t\t%s\n", msg); |
| 2699 | |
| 2700 | seq_printf(m, "\nStatistics:\n"); |
| 2701 | seq_printf(m, "\tpackets started:\t%lu\n", pd->stats.pkt_started); |
| 2702 | seq_printf(m, "\tpackets ended:\t\t%lu\n", pd->stats.pkt_ended); |
| 2703 | seq_printf(m, "\twritten:\t\t%lukB\n", pd->stats.secs_w >> 1); |
| 2704 | seq_printf(m, "\tread gather:\t\t%lukB\n", pd->stats.secs_rg >> 1); |
| 2705 | seq_printf(m, "\tread:\t\t\t%lukB\n", pd->stats.secs_r >> 1); |
| 2706 | |
| 2707 | seq_printf(m, "\nMisc:\n"); |
| 2708 | seq_printf(m, "\treference count:\t%d\n", pd->refcnt); |
| 2709 | seq_printf(m, "\tflags:\t\t\t0x%lx\n", pd->flags); |
| 2710 | seq_printf(m, "\tread speed:\t\t%ukB/s\n", pd->read_speed); |
| 2711 | seq_printf(m, "\twrite speed:\t\t%ukB/s\n", pd->write_speed); |
| 2712 | seq_printf(m, "\tstart offset:\t\t%lu\n", pd->offset); |
| 2713 | seq_printf(m, "\tmode page offset:\t%u\n", pd->mode_offset); |
| 2714 | |
| 2715 | seq_printf(m, "\nQueue state:\n"); |
| 2716 | seq_printf(m, "\tbios queued:\t\t%d\n", pd->bio_queue_size); |
| 2717 | seq_printf(m, "\tbios pending:\t\t%d\n", atomic_read(&pd->cdrw.pending_bios)); |
| 2718 | seq_printf(m, "\tcurrent sector:\t\t0x%llx\n", (unsigned long long)pd->current_sector); |
| 2719 | |
| 2720 | pkt_count_states(pd, states); |
| 2721 | seq_printf(m, "\tstate:\t\t\ti:%d ow:%d rw:%d ww:%d rec:%d fin:%d\n", |
| 2722 | states[0], states[1], states[2], states[3], states[4], states[5]); |
| 2723 | |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 2724 | seq_printf(m, "\twrite congestion marks:\toff=%d on=%d\n", |
| 2725 | pd->write_congestion_off, |
| 2726 | pd->write_congestion_on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | return 0; |
| 2728 | } |
| 2729 | |
| 2730 | static int pkt_seq_open(struct inode *inode, struct file *file) |
| 2731 | { |
| 2732 | return single_open(file, pkt_seq_show, PDE(inode)->data); |
| 2733 | } |
| 2734 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 2735 | static const struct file_operations pkt_proc_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2736 | .open = pkt_seq_open, |
| 2737 | .read = seq_read, |
| 2738 | .llseek = seq_lseek, |
| 2739 | .release = single_release |
| 2740 | }; |
| 2741 | |
| 2742 | static int pkt_new_dev(struct pktcdvd_device *pd, dev_t dev) |
| 2743 | { |
| 2744 | int i; |
| 2745 | int ret = 0; |
| 2746 | char b[BDEVNAME_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | struct block_device *bdev; |
| 2748 | |
| 2749 | if (pd->pkt_dev == dev) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2750 | printk(DRIVER_NAME": Recursive setup not allowed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2751 | return -EBUSY; |
| 2752 | } |
| 2753 | for (i = 0; i < MAX_WRITERS; i++) { |
| 2754 | struct pktcdvd_device *pd2 = pkt_devs[i]; |
| 2755 | if (!pd2) |
| 2756 | continue; |
| 2757 | if (pd2->bdev->bd_dev == dev) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2758 | printk(DRIVER_NAME": %s already setup\n", bdevname(pd2->bdev, b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2759 | return -EBUSY; |
| 2760 | } |
| 2761 | if (pd2->pkt_dev == dev) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2762 | printk(DRIVER_NAME": Can't chain pktcdvd devices\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | return -EBUSY; |
| 2764 | } |
| 2765 | } |
| 2766 | |
| 2767 | bdev = bdget(dev); |
| 2768 | if (!bdev) |
| 2769 | return -ENOMEM; |
| 2770 | ret = blkdev_get(bdev, FMODE_READ, O_RDONLY | O_NONBLOCK); |
| 2771 | if (ret) |
| 2772 | return ret; |
| 2773 | |
| 2774 | /* This is safe, since we have a reference from open(). */ |
| 2775 | __module_get(THIS_MODULE); |
| 2776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2777 | pd->bdev = bdev; |
| 2778 | set_blocksize(bdev, CD_FRAMESIZE); |
| 2779 | |
| 2780 | pkt_init_queue(pd); |
| 2781 | |
| 2782 | atomic_set(&pd->cdrw.pending_bios, 0); |
| 2783 | pd->cdrw.thread = kthread_run(kcdrwd, pd, "%s", pd->name); |
| 2784 | if (IS_ERR(pd->cdrw.thread)) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2785 | printk(DRIVER_NAME": can't start kernel thread\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | ret = -ENOMEM; |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2787 | goto out_mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2788 | } |
| 2789 | |
Denis V. Lunev | c7705f3 | 2008-04-29 01:02:35 -0700 | [diff] [blame] | 2790 | proc_create_data(pd->name, 0, pkt_proc, &pkt_proc_fops, pd); |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2791 | DPRINTK(DRIVER_NAME": writer %s mapped to %s\n", pd->name, bdevname(bdev, b)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | return 0; |
| 2793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2794 | out_mem: |
| 2795 | blkdev_put(bdev); |
| 2796 | /* This is safe: open() is still holding a reference. */ |
| 2797 | module_put(THIS_MODULE); |
| 2798 | return ret; |
| 2799 | } |
| 2800 | |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 2801 | static long pkt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2802 | { |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 2803 | struct inode *inode = file->f_path.dentry->d_inode; |
| 2804 | struct pktcdvd_device *pd; |
| 2805 | long ret; |
| 2806 | |
| 2807 | lock_kernel(); |
| 2808 | pd = inode->i_bdev->bd_disk->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | |
| 2810 | VPRINTK("pkt_ioctl: cmd %x, dev %d:%d\n", cmd, imajor(inode), iminor(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2811 | |
| 2812 | switch (cmd) { |
| 2813 | /* |
| 2814 | * forward selected CDROM ioctls to CD-ROM, for UDF |
| 2815 | */ |
| 2816 | case CDROMMULTISESSION: |
| 2817 | case CDROMREADTOCENTRY: |
| 2818 | case CDROM_LAST_WRITTEN: |
| 2819 | case CDROM_SEND_PACKET: |
| 2820 | case SCSI_IOCTL_SEND_COMMAND: |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 2821 | ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
| 2822 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2823 | |
| 2824 | case CDROMEJECT: |
| 2825 | /* |
| 2826 | * The door gets locked when the device is opened, so we |
| 2827 | * have to unlock it or else the eject command fails. |
| 2828 | */ |
Peter Osterlund | 948423e | 2006-02-14 13:52:56 -0800 | [diff] [blame] | 2829 | if (pd->refcnt == 1) |
| 2830 | pkt_lock_door(pd, 0); |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 2831 | ret = blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg); |
| 2832 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2833 | |
| 2834 | default: |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2835 | VPRINTK(DRIVER_NAME": Unknown ioctl for %s (%x)\n", pd->name, cmd); |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 2836 | ret = -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2837 | } |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 2838 | unlock_kernel(); |
| 2839 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2840 | } |
| 2841 | |
| 2842 | static int pkt_media_changed(struct gendisk *disk) |
| 2843 | { |
| 2844 | struct pktcdvd_device *pd = disk->private_data; |
| 2845 | struct gendisk *attached_disk; |
| 2846 | |
| 2847 | if (!pd) |
| 2848 | return 0; |
| 2849 | if (!pd->bdev) |
| 2850 | return 0; |
| 2851 | attached_disk = pd->bdev->bd_disk; |
| 2852 | if (!attached_disk) |
| 2853 | return 0; |
| 2854 | return attached_disk->fops->media_changed(attached_disk); |
| 2855 | } |
| 2856 | |
| 2857 | static struct block_device_operations pktcdvd_ops = { |
| 2858 | .owner = THIS_MODULE, |
| 2859 | .open = pkt_open, |
| 2860 | .release = pkt_close, |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 2861 | .unlocked_ioctl = pkt_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2862 | .media_changed = pkt_media_changed, |
| 2863 | }; |
| 2864 | |
| 2865 | /* |
| 2866 | * Set up mapping from pktcdvd device to CD-ROM device. |
| 2867 | */ |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2868 | static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2869 | { |
| 2870 | int idx; |
| 2871 | int ret = -ENOMEM; |
| 2872 | struct pktcdvd_device *pd; |
| 2873 | struct gendisk *disk; |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2874 | |
| 2875 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2876 | |
| 2877 | for (idx = 0; idx < MAX_WRITERS; idx++) |
| 2878 | if (!pkt_devs[idx]) |
| 2879 | break; |
| 2880 | if (idx == MAX_WRITERS) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2881 | printk(DRIVER_NAME": max %d writers supported\n", MAX_WRITERS); |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2882 | ret = -EBUSY; |
| 2883 | goto out_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2884 | } |
| 2885 | |
Peter Osterlund | 1107d2e | 2005-09-13 01:25:29 -0700 | [diff] [blame] | 2886 | pd = kzalloc(sizeof(struct pktcdvd_device), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | if (!pd) |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2888 | goto out_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | |
Matthew Dobson | 0eaae62a | 2006-03-26 01:37:47 -0800 | [diff] [blame] | 2890 | pd->rb_pool = mempool_create_kmalloc_pool(PKT_RB_POOL_SIZE, |
| 2891 | sizeof(struct pkt_rb_node)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2892 | if (!pd->rb_pool) |
| 2893 | goto out_mem; |
| 2894 | |
Peter Osterlund | e1bc89b | 2006-02-04 23:27:47 -0800 | [diff] [blame] | 2895 | INIT_LIST_HEAD(&pd->cdrw.pkt_free_list); |
| 2896 | INIT_LIST_HEAD(&pd->cdrw.pkt_active_list); |
| 2897 | spin_lock_init(&pd->cdrw.active_list_lock); |
| 2898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2899 | spin_lock_init(&pd->lock); |
| 2900 | spin_lock_init(&pd->iosched.lock); |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2901 | sprintf(pd->name, DRIVER_NAME"%d", idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2902 | init_waitqueue_head(&pd->wqueue); |
| 2903 | pd->bio_queue = RB_ROOT; |
| 2904 | |
Thomas Maier | 0a0fc96 | 2006-12-08 02:36:11 -0800 | [diff] [blame] | 2905 | pd->write_congestion_on = write_congestion_on; |
| 2906 | pd->write_congestion_off = write_congestion_off; |
| 2907 | |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2908 | disk = alloc_disk(1); |
| 2909 | if (!disk) |
| 2910 | goto out_mem; |
| 2911 | pd->disk = disk; |
Thomas Maier | add2166 | 2006-10-04 02:15:30 -0700 | [diff] [blame] | 2912 | disk->major = pktdev_major; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2913 | disk->first_minor = idx; |
| 2914 | disk->fops = &pktcdvd_ops; |
| 2915 | disk->flags = GENHD_FL_REMOVABLE; |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2916 | strcpy(disk->disk_name, pd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2917 | disk->private_data = pd; |
| 2918 | disk->queue = blk_alloc_queue(GFP_KERNEL); |
| 2919 | if (!disk->queue) |
| 2920 | goto out_mem2; |
| 2921 | |
| 2922 | pd->pkt_dev = MKDEV(disk->major, disk->first_minor); |
| 2923 | ret = pkt_new_dev(pd, dev); |
| 2924 | if (ret) |
| 2925 | goto out_new_dev; |
| 2926 | |
| 2927 | add_disk(disk); |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2928 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 2929 | pkt_sysfs_dev_new(pd); |
| 2930 | pkt_debugfs_dev_new(pd); |
| 2931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2932 | pkt_devs[idx] = pd; |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2933 | if (pkt_dev) |
| 2934 | *pkt_dev = pd->pkt_dev; |
| 2935 | |
| 2936 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2937 | return 0; |
| 2938 | |
| 2939 | out_new_dev: |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 2940 | blk_cleanup_queue(disk->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2941 | out_mem2: |
| 2942 | put_disk(disk); |
| 2943 | out_mem: |
| 2944 | if (pd->rb_pool) |
| 2945 | mempool_destroy(pd->rb_pool); |
| 2946 | kfree(pd); |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2947 | out_mutex: |
| 2948 | mutex_unlock(&ctl_mutex); |
| 2949 | printk(DRIVER_NAME": setup of pktcdvd device failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2950 | return ret; |
| 2951 | } |
| 2952 | |
| 2953 | /* |
| 2954 | * Tear down mapping from pktcdvd device to CD-ROM device. |
| 2955 | */ |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2956 | static int pkt_remove_dev(dev_t pkt_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | { |
| 2958 | struct pktcdvd_device *pd; |
| 2959 | int idx; |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2960 | int ret = 0; |
| 2961 | |
| 2962 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2963 | |
| 2964 | for (idx = 0; idx < MAX_WRITERS; idx++) { |
| 2965 | pd = pkt_devs[idx]; |
| 2966 | if (pd && (pd->pkt_dev == pkt_dev)) |
| 2967 | break; |
| 2968 | } |
| 2969 | if (idx == MAX_WRITERS) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2970 | DPRINTK(DRIVER_NAME": dev not setup\n"); |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2971 | ret = -ENXIO; |
| 2972 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2973 | } |
| 2974 | |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 2975 | if (pd->refcnt > 0) { |
| 2976 | ret = -EBUSY; |
| 2977 | goto out; |
| 2978 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | if (!IS_ERR(pd->cdrw.thread)) |
| 2980 | kthread_stop(pd->cdrw.thread); |
| 2981 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 2982 | pkt_devs[idx] = NULL; |
| 2983 | |
| 2984 | pkt_debugfs_dev_remove(pd); |
| 2985 | pkt_sysfs_dev_remove(pd); |
| 2986 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2987 | blkdev_put(pd->bdev); |
| 2988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2989 | remove_proc_entry(pd->name, pkt_proc); |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 2990 | DPRINTK(DRIVER_NAME": writer %s unmapped\n", pd->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2991 | |
| 2992 | del_gendisk(pd->disk); |
Al Viro | 1312f40 | 2006-03-12 11:02:03 -0500 | [diff] [blame] | 2993 | blk_cleanup_queue(pd->disk->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2994 | put_disk(pd->disk); |
| 2995 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2996 | mempool_destroy(pd->rb_pool); |
| 2997 | kfree(pd); |
| 2998 | |
| 2999 | /* This is safe: open() is still holding a reference. */ |
| 3000 | module_put(THIS_MODULE); |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 3001 | |
| 3002 | out: |
| 3003 | mutex_unlock(&ctl_mutex); |
| 3004 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3005 | } |
| 3006 | |
| 3007 | static void pkt_get_status(struct pkt_ctrl_command *ctrl_cmd) |
| 3008 | { |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 3009 | struct pktcdvd_device *pd; |
| 3010 | |
| 3011 | mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| 3012 | |
| 3013 | pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3014 | if (pd) { |
| 3015 | ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev); |
| 3016 | ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev); |
| 3017 | } else { |
| 3018 | ctrl_cmd->dev = 0; |
| 3019 | ctrl_cmd->pkt_dev = 0; |
| 3020 | } |
| 3021 | ctrl_cmd->num_devices = MAX_WRITERS; |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 3022 | |
| 3023 | mutex_unlock(&ctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3024 | } |
| 3025 | |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3026 | static long pkt_ctl_ioctl(struct file *file, unsigned int cmd, |
| 3027 | unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | { |
| 3029 | void __user *argp = (void __user *)arg; |
| 3030 | struct pkt_ctrl_command ctrl_cmd; |
| 3031 | int ret = 0; |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 3032 | dev_t pkt_dev = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3033 | |
| 3034 | if (cmd != PACKET_CTRL_CMD) |
| 3035 | return -ENOTTY; |
| 3036 | |
| 3037 | if (copy_from_user(&ctrl_cmd, argp, sizeof(struct pkt_ctrl_command))) |
| 3038 | return -EFAULT; |
| 3039 | |
| 3040 | switch (ctrl_cmd.command) { |
| 3041 | case PKT_CTRL_CMD_SETUP: |
| 3042 | if (!capable(CAP_SYS_ADMIN)) |
| 3043 | return -EPERM; |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3044 | lock_kernel(); |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 3045 | ret = pkt_setup_dev(new_decode_dev(ctrl_cmd.dev), &pkt_dev); |
| 3046 | ctrl_cmd.pkt_dev = new_encode_dev(pkt_dev); |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3047 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3048 | break; |
| 3049 | case PKT_CTRL_CMD_TEARDOWN: |
| 3050 | if (!capable(CAP_SYS_ADMIN)) |
| 3051 | return -EPERM; |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3052 | lock_kernel(); |
Thomas Maier | adb9250 | 2006-12-08 02:36:10 -0800 | [diff] [blame] | 3053 | ret = pkt_remove_dev(new_decode_dev(ctrl_cmd.pkt_dev)); |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3054 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3055 | break; |
| 3056 | case PKT_CTRL_CMD_STATUS: |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3057 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3058 | pkt_get_status(&ctrl_cmd); |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3059 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3060 | break; |
| 3061 | default: |
| 3062 | return -ENOTTY; |
| 3063 | } |
| 3064 | |
| 3065 | if (copy_to_user(argp, &ctrl_cmd, sizeof(struct pkt_ctrl_command))) |
| 3066 | return -EFAULT; |
| 3067 | return ret; |
| 3068 | } |
| 3069 | |
| 3070 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 3071 | static const struct file_operations pkt_ctl_fops = { |
Alan Cox | 5b6155e | 2008-07-04 09:29:16 +0200 | [diff] [blame] | 3072 | .unlocked_ioctl = pkt_ctl_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3073 | .owner = THIS_MODULE, |
| 3074 | }; |
| 3075 | |
| 3076 | static struct miscdevice pkt_misc = { |
| 3077 | .minor = MISC_DYNAMIC_MINOR, |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 3078 | .name = DRIVER_NAME, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | .fops = &pkt_ctl_fops |
| 3080 | }; |
| 3081 | |
| 3082 | static int __init pkt_init(void) |
| 3083 | { |
| 3084 | int ret; |
| 3085 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 3086 | mutex_init(&ctl_mutex); |
| 3087 | |
Matthew Dobson | 0eaae62a | 2006-03-26 01:37:47 -0800 | [diff] [blame] | 3088 | psd_pool = mempool_create_kmalloc_pool(PSD_POOL_SIZE, |
| 3089 | sizeof(struct packet_stacked_data)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3090 | if (!psd_pool) |
| 3091 | return -ENOMEM; |
| 3092 | |
Thomas Maier | add2166 | 2006-10-04 02:15:30 -0700 | [diff] [blame] | 3093 | ret = register_blkdev(pktdev_major, DRIVER_NAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3094 | if (ret < 0) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 3095 | printk(DRIVER_NAME": Unable to register block device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3096 | goto out2; |
| 3097 | } |
Thomas Maier | add2166 | 2006-10-04 02:15:30 -0700 | [diff] [blame] | 3098 | if (!pktdev_major) |
| 3099 | pktdev_major = ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3100 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 3101 | ret = pkt_sysfs_init(); |
| 3102 | if (ret) |
| 3103 | goto out; |
| 3104 | |
| 3105 | pkt_debugfs_init(); |
| 3106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3107 | ret = misc_register(&pkt_misc); |
| 3108 | if (ret) { |
Thomas Maier | 7822082 | 2006-10-04 02:15:28 -0700 | [diff] [blame] | 3109 | printk(DRIVER_NAME": Unable to register misc device\n"); |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 3110 | goto out_misc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3111 | } |
| 3112 | |
Alexey Dobriyan | 928b4d8 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 3113 | pkt_proc = proc_mkdir("driver/"DRIVER_NAME, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3115 | return 0; |
| 3116 | |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 3117 | out_misc: |
| 3118 | pkt_debugfs_cleanup(); |
| 3119 | pkt_sysfs_cleanup(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3120 | out: |
Thomas Maier | add2166 | 2006-10-04 02:15:30 -0700 | [diff] [blame] | 3121 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3122 | out2: |
| 3123 | mempool_destroy(psd_pool); |
| 3124 | return ret; |
| 3125 | } |
| 3126 | |
| 3127 | static void __exit pkt_exit(void) |
| 3128 | { |
Alexey Dobriyan | 928b4d8 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 3129 | remove_proc_entry("driver/"DRIVER_NAME, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3130 | misc_deregister(&pkt_misc); |
Thomas Maier | 3269485 | 2006-12-08 02:36:12 -0800 | [diff] [blame] | 3131 | |
| 3132 | pkt_debugfs_cleanup(); |
| 3133 | pkt_sysfs_cleanup(); |
| 3134 | |
Thomas Maier | add2166 | 2006-10-04 02:15:30 -0700 | [diff] [blame] | 3135 | unregister_blkdev(pktdev_major, DRIVER_NAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3136 | mempool_destroy(psd_pool); |
| 3137 | } |
| 3138 | |
| 3139 | MODULE_DESCRIPTION("Packet writing layer for CD/DVD drives"); |
| 3140 | MODULE_AUTHOR("Jens Axboe <axboe@suse.de>"); |
| 3141 | MODULE_LICENSE("GPL"); |
| 3142 | |
| 3143 | module_init(pkt_init); |
| 3144 | module_exit(pkt_exit); |