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_FLUSH) {
 203                         if (ps3disk_submit_flush_request(dev, req))
 204                                 break;
 205                 } else {
 206                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
 207                         end_request(req, 0);
 208                         continue;
 209                 }
 210         }
 211 }
 212
 213 static void ps3disk_request(struct request_queue *q)
 214 {
 215         struct ps3_storage_device *dev = q->queuedata;
 216         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 217
 218         if (priv->req) {
 219                 dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
 220                 return;
 221         }
 222
 223         ps3disk_do_request(dev, q);
 224 }
 225
 226 static irqreturn_t ps3disk_interrupt(int irq, void *data)
 227 {
 228         struct ps3_storage_device *dev = data;
 229         struct ps3disk_private *priv;
 230         struct request *req;
 231         int res, read, error;
 232         u64 tag, status;
 233         unsigned long num_sectors;
 234         const char *op;
 235
 236         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
 237
 238         if (tag != dev->tag)
 239                 dev_err(&dev->sbd.core,
 240                         "%s:%u: tag mismatch, got %lx, expected %lx\n",
 241                         __func__, __LINE__, tag, dev->tag);
 242
 243         if (res) {
 244                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
 245                         __func__, __LINE__, res, status);
 246                 return IRQ_HANDLED;
 247         }
 248
 249         priv = dev->sbd.core.driver_data;
 250         req = priv->req;
 251         if (!req) {
 252                 dev_dbg(&dev->sbd.core,
 253                         "%s:%u non-block layer request completed\n", __func__,
 254                         __LINE__);
 255                 dev->lv1_status = status;
 256                 complete(&dev->done);
 257                 return IRQ_HANDLED;
 258         }
 259
 260         if (req->cmd_type == REQ_TYPE_FLUSH) {
 261                 read = 0;
 262                 num_sectors = req->hard_cur_sectors;
 263                 op = "flush";
 264         } else {
 265                 read = !rq_data_dir(req);
 266                 num_sectors = req->nr_sectors;
 267                 op = read ? "read" : "write";
 268         }
 269         if (status) {
 270                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
 271                         __LINE__, op, status);
 272                 error = -EIO;
 273         } else {
 274                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
 275                         __LINE__, op);
 276                 error = 0;
 277                 if (read)
 278                         ps3disk_scatter_gather(dev, req, 0);
 279         }
 280
 281         spin_lock(&priv->lock);
 282         __blk_end_request(req, error, num_sectors << 9);
 283         priv->req = NULL;
 284         ps3disk_do_request(dev, priv->queue);
 285         spin_unlock(&priv->lock);
 286
 287         return IRQ_HANDLED;
 288 }
 289
 290 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
 291 {
 292         u64 res;
 293
 294         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
 295
 296         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
 297         if (res) {
 298                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
 299                         __func__, __LINE__, res);
 300                 return -EIO;
 301         }
 302         return 0;
 303 }
 304
 305
 306 /* ATA helpers copied from drivers/ata/libata-core.c */
 307
 308 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
 309 {
 310 #ifdef __BIG_ENDIAN
 311         unsigned int i;
 312
 313         for (i = 0; i < buf_words; i++)
 314                 buf[i] = le16_to_cpu(buf[i]);
 315 #endif /* __BIG_ENDIAN */
 316 }
 317
 318 static u64 ata_id_n_sectors(const u16 *id)
 319 {
 320         if (ata_id_has_lba(id)) {
 321                 if (ata_id_has_lba48(id))
 322                         return ata_id_u64(id, 100);
 323                 else
 324                         return ata_id_u32(id, 60);
 325         } else {
 326                 if (ata_id_current_chs_valid(id))
 327                         return ata_id_u32(id, 57);
 328                 else
 329                         return id[1] * id[3] * id[6];
 330         }
 331 }
 332
 333 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
 334                           unsigned int len)
 335 {
 336         unsigned int c;
 337
 338         while (len > 0) {
 339                 c = id[ofs] >> 8;
 340                 *s = c;
 341                 s++;
 342
 343                 c = id[ofs] & 0xff;
 344                 *s = c;
 345                 s++;
 346
 347                 ofs++;
 348                 len -= 2;
 349         }
 350 }
 351
 352 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
 353                             unsigned int len)
 354 {
 355         unsigned char *p;
 356
 357         WARN_ON(!(len & 1));
 358
 359         ata_id_string(id, s, ofs, len - 1);
 360
 361         p = s + strnlen(s, len - 1);
 362         while (p > s && p[-1] == ' ')
 363                 p--;
 364         *p = '\0';
 365 }
 366
 367 static int ps3disk_identify(struct ps3_storage_device *dev)
 368 {
 369         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 370         struct lv1_ata_cmnd_block ata_cmnd;
 371         u16 *id = dev->bounce_buf;
 372         u64 res;
 373
 374         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
 375
 376         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
 377         ata_cmnd.command = ATA_CMD_ID_ATA;
 378         ata_cmnd.sector_count = 1;
 379         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
 380         ata_cmnd.buffer = dev->bounce_lpar;
 381         ata_cmnd.proto = PIO_DATA_IN_PROTO;
 382         ata_cmnd.in_out = DIR_READ;
 383
 384         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
 385                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
 386                                    sizeof(ata_cmnd), ata_cmnd.buffer,
 387                                    ata_cmnd.arglen);
 388         if (res) {
 389                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%lx\n",
 390                         __func__, __LINE__, res);
 391                 return -EIO;
 392         }
 393
 394         swap_buf_le16(id, ATA_ID_WORDS);
 395
 396         /* All we're interested in are raw capacity and model name */
 397         priv->raw_capacity = ata_id_n_sectors(id);
 398         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
 399         return 0;
 400 }
 401
 402 static void ps3disk_prepare_flush(struct request_queue *q, struct request *req)
 403 {
 404         struct ps3_storage_device *dev = q->queuedata;
 405
 406         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 407
 408         req->cmd_type = REQ_TYPE_FLUSH;
 409 }
 410
 411 static unsigned long ps3disk_mask;
 412
 413 static DEFINE_MUTEX(ps3disk_mask_mutex);
 414
 415 static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
 416 {
 417         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 418         struct ps3disk_private *priv;
 419         int error;
 420         unsigned int devidx;
 421         struct request_queue *queue;
 422         struct gendisk *gendisk;
 423
 424         if (dev->blk_size < 512) {
 425                 dev_err(&dev->sbd.core,
 426                         "%s:%u: cannot handle block size %lu\n", __func__,
 427                         __LINE__, dev->blk_size);
 428                 return -EINVAL;
 429         }
 430
 431         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
 432         mutex_lock(&ps3disk_mask_mutex);
 433         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
 434         if (devidx >= PS3DISK_MAX_DISKS) {
 435                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
 436                         __LINE__);
 437                 mutex_unlock(&ps3disk_mask_mutex);
 438                 return -ENOSPC;
 439         }
 440         __set_bit(devidx, &ps3disk_mask);
 441         mutex_unlock(&ps3disk_mask_mutex);
 442
 443         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 444         if (!priv) {
 445                 error = -ENOMEM;
 446                 goto fail;
 447         }
 448
 449         dev->sbd.core.driver_data = priv;
 450         spin_lock_init(&priv->lock);
 451
 452         dev->bounce_size = BOUNCE_SIZE;
 453         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 454         if (!dev->bounce_buf) {
 455                 error = -ENOMEM;
 456                 goto fail_free_priv;
 457         }
 458
 459         error = ps3stor_setup(dev, ps3disk_interrupt);
 460         if (error)
 461                 goto fail_free_bounce;
 462
 463         ps3disk_identify(dev);
 464
 465         queue = blk_init_queue(ps3disk_request, &priv->lock);
 466         if (!queue) {
 467                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
 468                         __func__, __LINE__);
 469                 error = -ENOMEM;
 470                 goto fail_teardown;
 471         }
 472
 473         priv->queue = queue;
 474         queue->queuedata = dev;
 475
 476         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
 477
 478         blk_queue_max_sectors(queue, dev->bounce_size >> 9);
 479         blk_queue_segment_boundary(queue, -1UL);
 480         blk_queue_dma_alignment(queue, dev->blk_size-1);
 481         blk_queue_hardsect_size(queue, dev->blk_size);
 482
 483         blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
 484                           ps3disk_prepare_flush);
 485
 486         blk_queue_max_phys_segments(queue, -1);
 487         blk_queue_max_hw_segments(queue, -1);
 488         blk_queue_max_segment_size(queue, dev->bounce_size);
 489
 490         gendisk = alloc_disk(PS3DISK_MINORS);
 491         if (!gendisk) {
 492                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
 493                         __LINE__);
 494                 error = -ENOMEM;
 495                 goto fail_cleanup_queue;
 496         }
 497
 498         priv->gendisk = gendisk;
 499         gendisk->major = ps3disk_major;
 500         gendisk->first_minor = devidx * PS3DISK_MINORS;
 501         gendisk->fops = &ps3disk_fops;
 502         gendisk->queue = queue;
 503         gendisk->private_data = dev;
 504         gendisk->driverfs_dev = &dev->sbd.core;
 505         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
 506                  devidx+'a');
 507         priv->blocking_factor = dev->blk_size >> 9;
 508         set_capacity(gendisk,
 509                      dev->regions[dev->region_idx].size*priv->blocking_factor);
 510
 511         dev_info(&dev->sbd.core,
 512                  "%s is a %s (%lu MiB total, %lu MiB for OtherOS)\n",
 513                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
 514                  get_capacity(gendisk) >> 11);
 515
 516         add_disk(gendisk);
 517         return 0;
 518
 519 fail_cleanup_queue:
 520         blk_cleanup_queue(queue);
 521 fail_teardown:
 522         ps3stor_teardown(dev);
 523 fail_free_bounce:
 524         kfree(dev->bounce_buf);
 525 fail_free_priv:
 526         kfree(priv);
 527         dev->sbd.core.driver_data = NULL;
 528 fail:
 529         mutex_lock(&ps3disk_mask_mutex);
 530         __clear_bit(devidx, &ps3disk_mask);
 531         mutex_unlock(&ps3disk_mask_mutex);
 532         return error;
 533 }
 534
 535 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
 536 {
 537         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 538         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 539
 540         mutex_lock(&ps3disk_mask_mutex);
 541         __clear_bit(priv->gendisk->first_minor / PS3DISK_MINORS,
 542                     &ps3disk_mask);
 543         mutex_unlock(&ps3disk_mask_mutex);
 544         del_gendisk(priv->gendisk);
 545         blk_cleanup_queue(priv->queue);
 546         put_disk(priv->gendisk);
 547         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
 548         ps3disk_sync_cache(dev);
 549         ps3stor_teardown(dev);
 550         kfree(dev->bounce_buf);
 551         kfree(priv);
 552         dev->sbd.core.driver_data = NULL;
 553         return 0;
 554 }
 555
 556 static struct ps3_system_bus_driver ps3disk = {
 557         .match_id       = PS3_MATCH_ID_STOR_DISK,
 558         .core.name      = DEVICE_NAME,
 559         .core.owner     = THIS_MODULE,
 560         .probe          = ps3disk_probe,
 561         .remove         = ps3disk_remove,
 562         .shutdown       = ps3disk_remove,
 563 };
 564
 565
 566 static int __init ps3disk_init(void)
 567 {
 568         int error;
 569
 570         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 571                 return -ENODEV;
 572
 573         error = register_blkdev(0, DEVICE_NAME);
 574         if (error <= 0) {
 575                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
 576                        __LINE__, error);
 577                 return error;
 578         }
 579         ps3disk_major = error;
 580
 581         pr_info("%s:%u: registered block device major %d\n", __func__,
 582                 __LINE__, ps3disk_major);
 583
 584         error = ps3_system_bus_driver_register(&ps3disk);
 585         if (error)
 586                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
 587
 588         return error;
 589 }
 590
 591 static void __exit ps3disk_exit(void)
 592 {
 593         ps3_system_bus_driver_unregister(&ps3disk);
 594         unregister_blkdev(ps3disk_major, DEVICE_NAME);
 595 }
 596
 597 module_init(ps3disk_init);
 598 module_exit(ps3disk_exit);
 599
 600 MODULE_LICENSE("GPL");
 601 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
 602 MODULE_AUTHOR("Sony Corporation");
 603 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);