git.oblomov.eu Git - linux-2.6/blob - drivers/block/ps3disk.c

   1 /*
   2  * PS3 Disk Storage Driver
   3  *
   4  * Copyright (C) 2007 Sony Computer Entertainment Inc.
   5  * Copyright 2007 Sony Corp.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <linux/ata.h>
  22 #include <linux/blkdev.h>
  23
  24 #include <asm/lv1call.h>
  25 #include <asm/ps3stor.h>
  26 #include <asm/firmware.h>
  27
  28
  29 #define DEVICE_NAME             "ps3disk"
  30
  31 #define BOUNCE_SIZE             (64*1024)
  32
  33 #define PS3DISK_MAX_DISKS       16
  34 #define PS3DISK_MINORS          16
  35
  36
  37 #define PS3DISK_NAME            "ps3d%c"
  38
  39
  40 struct ps3disk_private {
  41         spinlock_t lock;                /* Request queue spinlock */
  42         struct request_queue *queue;
  43         struct gendisk *gendisk;
  44         unsigned int blocking_factor;
  45         struct request *req;
  46         u64 raw_capacity;
  47         unsigned char model[ATA_ID_PROD_LEN+1];
  48 };
  49
  50
  51 #define LV1_STORAGE_SEND_ATA_COMMAND    (2)
  52 #define LV1_STORAGE_ATA_HDDOUT          (0x23)
  53
  54 struct lv1_ata_cmnd_block {
  55         u16     features;
  56         u16     sector_count;
  57         u16     LBA_low;
  58         u16     LBA_mid;
  59         u16     LBA_high;
  60         u8      device;
  61         u8      command;
  62         u32     is_ext;
  63         u32     proto;
  64         u32     in_out;
  65         u32     size;
  66         u64     buffer;
  67         u32     arglen;
  68 };
  69
  70 enum lv1_ata_proto {
  71         NON_DATA_PROTO     = 0,
  72         PIO_DATA_IN_PROTO  = 1,
  73         PIO_DATA_OUT_PROTO = 2,
  74         DMA_PROTO = 3
  75 };
  76
  77 enum lv1_ata_in_out {
  78         DIR_WRITE = 0,                  /* memory -> device */
  79         DIR_READ = 1                    /* device -> memory */
  80 };
  81
  82 static int ps3disk_major;
  83
  84
  85 static struct block_device_operations ps3disk_fops = {
  86         .owner          = THIS_MODULE,
  87 };
  88
  89
  90 static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
  91                                    struct request *req, int gather)
  92 {
  93         unsigned int offset = 0;
  94         struct req_iterator iter;
  95         struct bio_vec *bvec;
  96         unsigned int i = 0;
  97         size_t size;
  98         void *buf;
  99
 100         rq_for_each_segment(bvec, req, iter) {
 101                 unsigned long flags;
 102                 dev_dbg(&dev->sbd.core,
 103                         "%s:%u: bio %u: %u segs %u sectors from %lu\n",
 104                         __func__, __LINE__, i, bio_segments(iter.bio),
 105                         bio_sectors(iter.bio), iter.bio->bi_sector);
 106
 107                 size = bvec->bv_len;
 108                 buf = bvec_kmap_irq(bvec, &flags);
 109                 if (gather)
 110                         memcpy(dev->bounce_buf+offset, buf, size);
 111                 else
 112                         memcpy(buf, dev->bounce_buf+offset, size);
 113                 offset += size;
 114                 flush_kernel_dcache_page(bvec->bv_page);
 115                 bvec_kunmap_irq(bvec, &flags);
 116                 i++;
 117         }
 118 }
 119
 120 static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
 121                                      struct request *req)
 122 {
 123         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 124         int write = rq_data_dir(req), res;
 125         const char *op = write ? "write" : "read";
 126         u64 start_sector, sectors;
 127         unsigned int region_id = dev->regions[dev->region_idx].id;
 128
 129 #ifdef DEBUG
 130         unsigned int n = 0;
 131         struct bio_vec *bv;
 132         struct req_iterator iter;
 133
 134         rq_for_each_segment(bv, req, iter)
 135                 n++;
 136         dev_dbg(&dev->sbd.core,
 137                 "%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
 138                 __func__, __LINE__, op, n, req->nr_sectors,
 139                 req->hard_nr_sectors);
 140 #endif
 141
 142         start_sector = req->sector * priv->blocking_factor;
 143         sectors = req->nr_sectors * priv->blocking_factor;
 144         dev_dbg(&dev->sbd.core, "%s:%u: %s %lu sectors starting at %lu\n",
 145                 __func__, __LINE__, op, sectors, start_sector);
 146
 147         if (write) {
 148                 ps3disk_scatter_gather(dev, req, 1);
 149
 150                 res = lv1_storage_write(dev->sbd.dev_id, region_id,
 151                                         start_sector, sectors, 0,
 152                                         dev->bounce_lpar, &dev->tag);
 153         } else {
 154                 res = lv1_storage_read(dev->sbd.dev_id, region_id,
 155                                        start_sector, sectors, 0,
 156                                        dev->bounce_lpar, &dev->tag);
 157         }
 158         if (res) {
 159                 dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
 160                         __LINE__, op, res);
 161                 end_request(req, 0);
 162                 return 0;
 163         }
 164
 165         priv->req = req;
 166         return 1;
 167 }
 168
 169 static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
 170                                         struct request *req)
 171 {
 172         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 173         u64 res;
 174
 175         dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
 176
 177         res = lv1_storage_send_device_command(dev->sbd.dev_id,
 178                                               LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
 179                                               0, &dev->tag);
 180         if (res) {
 181                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
 182                         __func__, __LINE__, res);
 183                 end_request(req, 0);
 184                 return 0;
 185         }
 186
 187         priv->req = req;
 188         return 1;
 189 }
 190
 191 static void ps3disk_do_request(struct ps3_storage_device *dev,
 192                                struct request_queue *q)
 193 {
 194         struct request *req;
 195
 196         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 197
 198         while ((req = elv_next_request(q))) {
 199                 if (blk_fs_request(req)) {
 200                         if (ps3disk_submit_request_sg(dev, req))
 201                                 break;
 202                 } else if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
 203                            req->cmd[0] == REQ_LB_OP_FLUSH) {
 204                         if (ps3disk_submit_flush_request(dev, req))
 205                                 break;
 206                 } else {
 207                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
 208                         end_request(req, 0);
 209                         continue;
 210                 }
 211         }
 212 }
 213
 214 static void ps3disk_request(struct request_queue *q)
 215 {
 216         struct ps3_storage_device *dev = q->queuedata;
 217         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 218
 219         if (priv->req) {
 220                 dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
 221                 return;
 222         }
 223
 224         ps3disk_do_request(dev, q);
 225 }
 226
 227 static irqreturn_t ps3disk_interrupt(int irq, void *data)
 228 {
 229         struct ps3_storage_device *dev = data;
 230         struct ps3disk_private *priv;
 231         struct request *req;
 232         int res, read, error;
 233         u64 tag, status;
 234         unsigned long num_sectors;
 235         const char *op;
 236
 237         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
 238
 239         if (tag != dev->tag)
 240                 dev_err(&dev->sbd.core,
 241                         "%s:%u: tag mismatch, got %lx, expected %lx\n",
 242                         __func__, __LINE__, tag, dev->tag);
 243
 244         if (res) {
 245                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
 246                         __func__, __LINE__, res, status);
 247                 return IRQ_HANDLED;
 248         }
 249
 250         priv = dev->sbd.core.driver_data;
 251         req = priv->req;
 252         if (!req) {
 253                 dev_dbg(&dev->sbd.core,
 254                         "%s:%u non-block layer request completed\n", __func__,
 255                         __LINE__);
 256                 dev->lv1_status = status;
 257                 complete(&dev->done);
 258                 return IRQ_HANDLED;
 259         }
 260
 261         if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
 262             req->cmd[0] == REQ_LB_OP_FLUSH) {
 263                 read = 0;
 264                 num_sectors = req->hard_cur_sectors;
 265                 op = "flush";
 266         } else {
 267                 read = !rq_data_dir(req);
 268                 num_sectors = req->nr_sectors;
 269                 op = read ? "read" : "write";
 270         }
 271         if (status) {
 272                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
 273                         __LINE__, op, status);
 274                 error = -EIO;
 275         } else {
 276                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
 277                         __LINE__, op);
 278                 error = 0;
 279                 if (read)
 280                         ps3disk_scatter_gather(dev, req, 0);
 281         }
 282
 283         spin_lock(&priv->lock);
 284         __blk_end_request(req, error, num_sectors << 9);
 285         priv->req = NULL;
 286         ps3disk_do_request(dev, priv->queue);
 287         spin_unlock(&priv->lock);
 288
 289         return IRQ_HANDLED;
 290 }
 291
 292 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
 293 {
 294         u64 res;
 295
 296         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
 297
 298         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
 299         if (res) {
 300                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
 301                         __func__, __LINE__, res);
 302                 return -EIO;
 303         }
 304         return 0;
 305 }
 306
 307
 308 /* ATA helpers copied from drivers/ata/libata-core.c */
 309
 310 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
 311 {
 312 #ifdef __BIG_ENDIAN
 313         unsigned int i;
 314
 315         for (i = 0; i < buf_words; i++)
 316                 buf[i] = le16_to_cpu(buf[i]);
 317 #endif /* __BIG_ENDIAN */
 318 }
 319
 320 static u64 ata_id_n_sectors(const u16 *id)
 321 {
 322         if (ata_id_has_lba(id)) {
 323                 if (ata_id_has_lba48(id))
 324                         return ata_id_u64(id, 100);
 325                 else
 326                         return ata_id_u32(id, 60);
 327         } else {
 328                 if (ata_id_current_chs_valid(id))
 329                         return ata_id_u32(id, 57);
 330                 else
 331                         return id[1] * id[3] * id[6];
 332         }
 333 }
 334
 335 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
 336                           unsigned int len)
 337 {
 338         unsigned int c;
 339
 340         while (len > 0) {
 341                 c = id[ofs] >> 8;
 342                 *s = c;
 343                 s++;
 344
 345                 c = id[ofs] & 0xff;
 346                 *s = c;
 347                 s++;
 348
 349                 ofs++;
 350                 len -= 2;
 351         }
 352 }
 353
 354 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
 355                             unsigned int len)
 356 {
 357         unsigned char *p;
 358
 359         WARN_ON(!(len & 1));
 360
 361         ata_id_string(id, s, ofs, len - 1);
 362
 363         p = s + strnlen(s, len - 1);
 364         while (p > s && p[-1] == ' ')
 365                 p--;
 366         *p = '\0';
 367 }
 368
 369 static int ps3disk_identify(struct ps3_storage_device *dev)
 370 {
 371         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 372         struct lv1_ata_cmnd_block ata_cmnd;
 373         u16 *id = dev->bounce_buf;
 374         u64 res;
 375
 376         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
 377
 378         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
 379         ata_cmnd.command = ATA_CMD_ID_ATA;
 380         ata_cmnd.sector_count = 1;
 381         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
 382         ata_cmnd.buffer = dev->bounce_lpar;
 383         ata_cmnd.proto = PIO_DATA_IN_PROTO;
 384         ata_cmnd.in_out = DIR_READ;
 385
 386         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
 387                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
 388                                    sizeof(ata_cmnd), ata_cmnd.buffer,
 389                                    ata_cmnd.arglen);
 390         if (res) {
 391                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%lx\n",
 392                         __func__, __LINE__, res);
 393                 return -EIO;
 394         }
 395
 396         swap_buf_le16(id, ATA_ID_WORDS);
 397
 398         /* All we're interested in are raw capacity and model name */
 399         priv->raw_capacity = ata_id_n_sectors(id);
 400         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
 401         return 0;
 402 }
 403
 404 static void ps3disk_prepare_flush(struct request_queue *q, struct request *req)
 405 {
 406         struct ps3_storage_device *dev = q->queuedata;
 407
 408         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 409
 410         req->cmd_type = REQ_TYPE_LINUX_BLOCK;
 411         req->cmd[0] = REQ_LB_OP_FLUSH;
 412 }
 413
 414 static unsigned long ps3disk_mask;
 415
 416 static DEFINE_MUTEX(ps3disk_mask_mutex);
 417
 418 static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
 419 {
 420         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 421         struct ps3disk_private *priv;
 422         int error;
 423         unsigned int devidx;
 424         struct request_queue *queue;
 425         struct gendisk *gendisk;
 426
 427         if (dev->blk_size < 512) {
 428                 dev_err(&dev->sbd.core,
 429                         "%s:%u: cannot handle block size %lu\n", __func__,
 430                         __LINE__, dev->blk_size);
 431                 return -EINVAL;
 432         }
 433
 434         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
 435         mutex_lock(&ps3disk_mask_mutex);
 436         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
 437         if (devidx >= PS3DISK_MAX_DISKS) {
 438                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
 439                         __LINE__);
 440                 mutex_unlock(&ps3disk_mask_mutex);
 441                 return -ENOSPC;
 442         }
 443         __set_bit(devidx, &ps3disk_mask);
 444         mutex_unlock(&ps3disk_mask_mutex);
 445
 446         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 447         if (!priv) {
 448                 error = -ENOMEM;
 449                 goto fail;
 450         }
 451
 452         dev->sbd.core.driver_data = priv;
 453         spin_lock_init(&priv->lock);
 454
 455         dev->bounce_size = BOUNCE_SIZE;
 456         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 457         if (!dev->bounce_buf) {
 458                 error = -ENOMEM;
 459                 goto fail_free_priv;
 460         }
 461
 462         error = ps3stor_setup(dev, ps3disk_interrupt);
 463         if (error)
 464                 goto fail_free_bounce;
 465
 466         ps3disk_identify(dev);
 467
 468         queue = blk_init_queue(ps3disk_request, &priv->lock);
 469         if (!queue) {
 470                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
 471                         __func__, __LINE__);
 472                 error = -ENOMEM;
 473                 goto fail_teardown;
 474         }
 475
 476         priv->queue = queue;
 477         queue->queuedata = dev;
 478
 479         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
 480
 481         blk_queue_max_sectors(queue, dev->bounce_size >> 9);
 482         blk_queue_segment_boundary(queue, -1UL);
 483         blk_queue_dma_alignment(queue, dev->blk_size-1);
 484         blk_queue_hardsect_size(queue, dev->blk_size);
 485
 486         blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
 487                           ps3disk_prepare_flush);
 488
 489         blk_queue_max_phys_segments(queue, -1);
 490         blk_queue_max_hw_segments(queue, -1);
 491         blk_queue_max_segment_size(queue, dev->bounce_size);
 492
 493         gendisk = alloc_disk(PS3DISK_MINORS);
 494         if (!gendisk) {
 495                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
 496                         __LINE__);
 497                 error = -ENOMEM;
 498                 goto fail_cleanup_queue;
 499         }
 500
 501         priv->gendisk = gendisk;
 502         gendisk->major = ps3disk_major;
 503         gendisk->first_minor = devidx * PS3DISK_MINORS;
 504         gendisk->fops = &ps3disk_fops;
 505         gendisk->queue = queue;
 506         gendisk->private_data = dev;
 507         gendisk->driverfs_dev = &dev->sbd.core;
 508         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
 509                  devidx+'a');
 510         priv->blocking_factor = dev->blk_size >> 9;
 511         set_capacity(gendisk,
 512                      dev->regions[dev->region_idx].size*priv->blocking_factor);
 513
 514         dev_info(&dev->sbd.core,
 515                  "%s is a %s (%lu MiB total, %lu MiB for OtherOS)\n",
 516                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
 517                  get_capacity(gendisk) >> 11);
 518
 519         add_disk(gendisk);
 520         return 0;
 521
 522 fail_cleanup_queue:
 523         blk_cleanup_queue(queue);
 524 fail_teardown:
 525         ps3stor_teardown(dev);
 526 fail_free_bounce:
 527         kfree(dev->bounce_buf);
 528 fail_free_priv:
 529         kfree(priv);
 530         dev->sbd.core.driver_data = NULL;
 531 fail:
 532         mutex_lock(&ps3disk_mask_mutex);
 533         __clear_bit(devidx, &ps3disk_mask);
 534         mutex_unlock(&ps3disk_mask_mutex);
 535         return error;
 536 }
 537
 538 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
 539 {
 540         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 541         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 542
 543         mutex_lock(&ps3disk_mask_mutex);
 544         __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
 545                     &ps3disk_mask);
 546         mutex_unlock(&ps3disk_mask_mutex);
 547         del_gendisk(priv->gendisk);
 548         blk_cleanup_queue(priv->queue);
 549         put_disk(priv->gendisk);
 550         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
 551         ps3disk_sync_cache(dev);
 552         ps3stor_teardown(dev);
 553         kfree(dev->bounce_buf);
 554         kfree(priv);
 555         dev->sbd.core.driver_data = NULL;
 556         return 0;
 557 }
 558
 559 static struct ps3_system_bus_driver ps3disk = {
 560         .match_id       = PS3_MATCH_ID_STOR_DISK,
 561         .core.name      = DEVICE_NAME,
 562         .core.owner     = THIS_MODULE,
 563         .probe          = ps3disk_probe,
 564         .remove         = ps3disk_remove,
 565         .shutdown       = ps3disk_remove,
 566 };
 567
 568
 569 static int __init ps3disk_init(void)
 570 {
 571         int error;
 572
 573         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 574                 return -ENODEV;
 575
 576         error = register_blkdev(0, DEVICE_NAME);
 577         if (error <= 0) {
 578                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
 579                        __LINE__, error);
 580                 return error;
 581         }
 582         ps3disk_major = error;
 583
 584         pr_info("%s:%u: registered block device major %d\n", __func__,
 585                 __LINE__, ps3disk_major);
 586
 587         error = ps3_system_bus_driver_register(&ps3disk);
 588         if (error)
 589                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
 590
 591         return error;
 592 }
 593
 594 static void __exit ps3disk_exit(void)
 595 {
 596         ps3_system_bus_driver_unregister(&ps3disk);
 597         unregister_blkdev(ps3disk_major, DEVICE_NAME);
 598 }
 599
 600 module_init(ps3disk_init);
 601 module_exit(ps3disk_exit);
 602
 603 MODULE_LICENSE("GPL");
 604 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
 605 MODULE_AUTHOR("Sony Corporation");
 606 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);