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),
 106                         (unsigned long)iter.bio->bi_sector);
 107
 108                 size = bvec->bv_len;
 109                 buf = bvec_kmap_irq(bvec, &flags);
 110                 if (gather)
 111                         memcpy(dev->bounce_buf+offset, buf, size);
 112                 else
 113                         memcpy(buf, dev->bounce_buf+offset, size);
 114                 offset += size;
 115                 flush_kernel_dcache_page(bvec->bv_page);
 116                 bvec_kunmap_irq(bvec, &flags);
 117                 i++;
 118         }
 119 }
 120
 121 static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
 122                                      struct request *req)
 123 {
 124         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 125         int write = rq_data_dir(req), res;
 126         const char *op = write ? "write" : "read";
 127         u64 start_sector, sectors;
 128         unsigned int region_id = dev->regions[dev->region_idx].id;
 129
 130 #ifdef DEBUG
 131         unsigned int n = 0;
 132         struct bio_vec *bv;
 133         struct req_iterator iter;
 134
 135         rq_for_each_segment(bv, req, iter)
 136                 n++;
 137         dev_dbg(&dev->sbd.core,
 138                 "%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
 139                 __func__, __LINE__, op, n, req->nr_sectors,
 140                 req->hard_nr_sectors);
 141 #endif
 142
 143         start_sector = req->sector * priv->blocking_factor;
 144         sectors = req->nr_sectors * priv->blocking_factor;
 145         dev_dbg(&dev->sbd.core, "%s:%u: %s %lu sectors starting at %lu\n",
 146                 __func__, __LINE__, op, sectors, start_sector);
 147
 148         if (write) {
 149                 ps3disk_scatter_gather(dev, req, 1);
 150
 151                 res = lv1_storage_write(dev->sbd.dev_id, region_id,
 152                                         start_sector, sectors, 0,
 153                                         dev->bounce_lpar, &dev->tag);
 154         } else {
 155                 res = lv1_storage_read(dev->sbd.dev_id, region_id,
 156                                        start_sector, sectors, 0,
 157                                        dev->bounce_lpar, &dev->tag);
 158         }
 159         if (res) {
 160                 dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
 161                         __LINE__, op, res);
 162                 end_request(req, 0);
 163                 return 0;
 164         }
 165
 166         priv->req = req;
 167         return 1;
 168 }
 169
 170 static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
 171                                         struct request *req)
 172 {
 173         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 174         u64 res;
 175
 176         dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
 177
 178         res = lv1_storage_send_device_command(dev->sbd.dev_id,
 179                                               LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
 180                                               0, &dev->tag);
 181         if (res) {
 182                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
 183                         __func__, __LINE__, res);
 184                 end_request(req, 0);
 185                 return 0;
 186         }
 187
 188         priv->req = req;
 189         return 1;
 190 }
 191
 192 static void ps3disk_do_request(struct ps3_storage_device *dev,
 193                                struct request_queue *q)
 194 {
 195         struct request *req;
 196
 197         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 198
 199         while ((req = elv_next_request(q))) {
 200                 if (blk_fs_request(req)) {
 201                         if (ps3disk_submit_request_sg(dev, req))
 202                                 break;
 203                 } else if (req->cmd_type == REQ_TYPE_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, uptodate;
 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_FLUSH) {
 262                 read = 0;
 263                 num_sectors = req->hard_cur_sectors;
 264                 op = "flush";
 265         } else {
 266                 read = !rq_data_dir(req);
 267                 num_sectors = req->nr_sectors;
 268                 op = read ? "read" : "write";
 269         }
 270         if (status) {
 271                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
 272                         __LINE__, op, status);
 273                 uptodate = 0;
 274         } else {
 275                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
 276                         __LINE__, op);
 277                 uptodate = 1;
 278                 if (read)
 279                         ps3disk_scatter_gather(dev, req, 0);
 280         }
 281
 282         spin_lock(&priv->lock);
 283         if (!end_that_request_first(req, uptodate, num_sectors)) {
 284                 add_disk_randomness(req->rq_disk);
 285                 blkdev_dequeue_request(req);
 286                 end_that_request_last(req, uptodate);
 287         }
 288         priv->req = NULL;
 289         ps3disk_do_request(dev, priv->queue);
 290         spin_unlock(&priv->lock);
 291
 292         return IRQ_HANDLED;
 293 }
 294
 295 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
 296 {
 297         u64 res;
 298
 299         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
 300
 301         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
 302         if (res) {
 303                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
 304                         __func__, __LINE__, res);
 305                 return -EIO;
 306         }
 307         return 0;
 308 }
 309
 310
 311 /* ATA helpers copied from drivers/ata/libata-core.c */
 312
 313 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
 314 {
 315 #ifdef __BIG_ENDIAN
 316         unsigned int i;
 317
 318         for (i = 0; i < buf_words; i++)
 319                 buf[i] = le16_to_cpu(buf[i]);
 320 #endif /* __BIG_ENDIAN */
 321 }
 322
 323 static u64 ata_id_n_sectors(const u16 *id)
 324 {
 325         if (ata_id_has_lba(id)) {
 326                 if (ata_id_has_lba48(id))
 327                         return ata_id_u64(id, 100);
 328                 else
 329                         return ata_id_u32(id, 60);
 330         } else {
 331                 if (ata_id_current_chs_valid(id))
 332                         return ata_id_u32(id, 57);
 333                 else
 334                         return id[1] * id[3] * id[6];
 335         }
 336 }
 337
 338 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
 339                           unsigned int len)
 340 {
 341         unsigned int c;
 342
 343         while (len > 0) {
 344                 c = id[ofs] >> 8;
 345                 *s = c;
 346                 s++;
 347
 348                 c = id[ofs] & 0xff;
 349                 *s = c;
 350                 s++;
 351
 352                 ofs++;
 353                 len -= 2;
 354         }
 355 }
 356
 357 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
 358                             unsigned int len)
 359 {
 360         unsigned char *p;
 361
 362         WARN_ON(!(len & 1));
 363
 364         ata_id_string(id, s, ofs, len - 1);
 365
 366         p = s + strnlen(s, len - 1);
 367         while (p > s && p[-1] == ' ')
 368                 p--;
 369         *p = '\0';
 370 }
 371
 372 static int ps3disk_identify(struct ps3_storage_device *dev)
 373 {
 374         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 375         struct lv1_ata_cmnd_block ata_cmnd;
 376         u16 *id = dev->bounce_buf;
 377         u64 res;
 378
 379         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
 380
 381         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
 382         ata_cmnd.command = ATA_CMD_ID_ATA;
 383         ata_cmnd.sector_count = 1;
 384         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
 385         ata_cmnd.buffer = dev->bounce_lpar;
 386         ata_cmnd.proto = PIO_DATA_IN_PROTO;
 387         ata_cmnd.in_out = DIR_READ;
 388
 389         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
 390                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
 391                                    sizeof(ata_cmnd), ata_cmnd.buffer,
 392                                    ata_cmnd.arglen);
 393         if (res) {
 394                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%lx\n",
 395                         __func__, __LINE__, res);
 396                 return -EIO;
 397         }
 398
 399         swap_buf_le16(id, ATA_ID_WORDS);
 400
 401         /* All we're interested in are raw capacity and model name */
 402         priv->raw_capacity = ata_id_n_sectors(id);
 403         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
 404         return 0;
 405 }
 406
 407 static void ps3disk_prepare_flush(struct request_queue *q, struct request *req)
 408 {
 409         struct ps3_storage_device *dev = q->queuedata;
 410
 411         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
 412
 413         memset(req->cmd, 0, sizeof(req->cmd));
 414         req->cmd_type = REQ_TYPE_FLUSH;
 415 }
 416
 417 static unsigned long ps3disk_mask;
 418
 419 static DEFINE_MUTEX(ps3disk_mask_mutex);
 420
 421 static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
 422 {
 423         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 424         struct ps3disk_private *priv;
 425         int error;
 426         unsigned int devidx;
 427         struct request_queue *queue;
 428         struct gendisk *gendisk;
 429
 430         if (dev->blk_size < 512) {
 431                 dev_err(&dev->sbd.core,
 432                         "%s:%u: cannot handle block size %lu\n", __func__,
 433                         __LINE__, dev->blk_size);
 434                 return -EINVAL;
 435         }
 436
 437         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
 438         mutex_lock(&ps3disk_mask_mutex);
 439         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
 440         if (devidx >= PS3DISK_MAX_DISKS) {
 441                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
 442                         __LINE__);
 443                 mutex_unlock(&ps3disk_mask_mutex);
 444                 return -ENOSPC;
 445         }
 446         __set_bit(devidx, &ps3disk_mask);
 447         mutex_unlock(&ps3disk_mask_mutex);
 448
 449         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 450         if (!priv) {
 451                 error = -ENOMEM;
 452                 goto fail;
 453         }
 454
 455         dev->sbd.core.driver_data = priv;
 456         spin_lock_init(&priv->lock);
 457
 458         dev->bounce_size = BOUNCE_SIZE;
 459         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 460         if (!dev->bounce_buf) {
 461                 error = -ENOMEM;
 462                 goto fail_free_priv;
 463         }
 464
 465         error = ps3stor_setup(dev, ps3disk_interrupt);
 466         if (error)
 467                 goto fail_free_bounce;
 468
 469         ps3disk_identify(dev);
 470
 471         queue = blk_init_queue(ps3disk_request, &priv->lock);
 472         if (!queue) {
 473                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
 474                         __func__, __LINE__);
 475                 error = -ENOMEM;
 476                 goto fail_teardown;
 477         }
 478
 479         priv->queue = queue;
 480         queue->queuedata = dev;
 481
 482         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
 483
 484         blk_queue_max_sectors(queue, dev->bounce_size >> 9);
 485         blk_queue_segment_boundary(queue, -1UL);
 486         blk_queue_dma_alignment(queue, dev->blk_size-1);
 487         blk_queue_hardsect_size(queue, dev->blk_size);
 488
 489         blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
 490                           ps3disk_prepare_flush);
 491
 492         blk_queue_max_phys_segments(queue, -1);
 493         blk_queue_max_hw_segments(queue, -1);
 494         blk_queue_max_segment_size(queue, dev->bounce_size);
 495
 496         gendisk = alloc_disk(PS3DISK_MINORS);
 497         if (!gendisk) {
 498                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
 499                         __LINE__);
 500                 error = -ENOMEM;
 501                 goto fail_cleanup_queue;
 502         }
 503
 504         priv->gendisk = gendisk;
 505         gendisk->major = ps3disk_major;
 506         gendisk->first_minor = devidx * PS3DISK_MINORS;
 507         gendisk->fops = &ps3disk_fops;
 508         gendisk->queue = queue;
 509         gendisk->private_data = dev;
 510         gendisk->driverfs_dev = &dev->sbd.core;
 511         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
 512                  devidx+'a');
 513         priv->blocking_factor = dev->blk_size >> 9;
 514         set_capacity(gendisk,
 515                      dev->regions[dev->region_idx].size*priv->blocking_factor);
 516
 517         dev_info(&dev->sbd.core,
 518                  "%s is a %s (%lu MiB total, %lu MiB for OtherOS)\n",
 519                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
 520                  get_capacity(gendisk) >> 11);
 521
 522         add_disk(gendisk);
 523         return 0;
 524
 525 fail_cleanup_queue:
 526         blk_cleanup_queue(queue);
 527 fail_teardown:
 528         ps3stor_teardown(dev);
 529 fail_free_bounce:
 530         kfree(dev->bounce_buf);
 531 fail_free_priv:
 532         kfree(priv);
 533         dev->sbd.core.driver_data = NULL;
 534 fail:
 535         mutex_lock(&ps3disk_mask_mutex);
 536         __clear_bit(devidx, &ps3disk_mask);
 537         mutex_unlock(&ps3disk_mask_mutex);
 538         return error;
 539 }
 540
 541 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
 542 {
 543         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 544         struct ps3disk_private *priv = dev->sbd.core.driver_data;
 545
 546         mutex_lock(&ps3disk_mask_mutex);
 547         __clear_bit(priv->gendisk->first_minor / PS3DISK_MINORS,
 548                     &ps3disk_mask);
 549         mutex_unlock(&ps3disk_mask_mutex);
 550         del_gendisk(priv->gendisk);
 551         blk_cleanup_queue(priv->queue);
 552         put_disk(priv->gendisk);
 553         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
 554         ps3disk_sync_cache(dev);
 555         ps3stor_teardown(dev);
 556         kfree(dev->bounce_buf);
 557         kfree(priv);
 558         dev->sbd.core.driver_data = NULL;
 559         return 0;
 560 }
 561
 562 static struct ps3_system_bus_driver ps3disk = {
 563         .match_id       = PS3_MATCH_ID_STOR_DISK,
 564         .core.name      = DEVICE_NAME,
 565         .core.owner     = THIS_MODULE,
 566         .probe          = ps3disk_probe,
 567         .remove         = ps3disk_remove,
 568         .shutdown       = ps3disk_remove,
 569 };
 570
 571
 572 static int __init ps3disk_init(void)
 573 {
 574         int error;
 575
 576         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 577                 return -ENODEV;
 578
 579         error = register_blkdev(0, DEVICE_NAME);
 580         if (error <= 0) {
 581                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
 582                        __LINE__, error);
 583                 return error;
 584         }
 585         ps3disk_major = error;
 586
 587         pr_info("%s:%u: registered block device major %d\n", __func__,
 588                 __LINE__, ps3disk_major);
 589
 590         error = ps3_system_bus_driver_register(&ps3disk);
 591         if (error)
 592                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
 593
 594         return error;
 595 }
 596
 597 static void __exit ps3disk_exit(void)
 598 {
 599         ps3_system_bus_driver_unregister(&ps3disk);
 600         unregister_blkdev(ps3disk_major, DEVICE_NAME);
 601 }
 602
 603 module_init(ps3disk_init);
 604 module_exit(ps3disk_exit);
 605
 606 MODULE_LICENSE("GPL");
 607 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
 608 MODULE_AUTHOR("Sony Corporation");
 609 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);