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 #include <linux/slab.h>
  24
  25 #include <asm/lv1call.h>
  26 #include <asm/ps3stor.h>
  27 #include <asm/firmware.h>
  28
  29
  30 #define DEVICE_NAME             "ps3disk"
  31
  32 #define BOUNCE_SIZE             (64*1024)
  33
  34 #define PS3DISK_MAX_DISKS       16
  35 #define PS3DISK_MINORS          16
  36
  37
  38 #define PS3DISK_NAME            "ps3d%c"
  39
  40
  41 struct ps3disk_private {
  42         spinlock_t lock;                /* Request queue spinlock */
  43         struct request_queue *queue;
  44         struct gendisk *gendisk;
  45         unsigned int blocking_factor;
  46         struct request *req;
  47         u64 raw_capacity;
  48         unsigned char model[ATA_ID_PROD_LEN+1];
  49 };
  50
  51
  52 #define LV1_STORAGE_SEND_ATA_COMMAND    (2)
  53 #define LV1_STORAGE_ATA_HDDOUT          (0x23)
  54
  55 struct lv1_ata_cmnd_block {
  56         u16     features;
  57         u16     sector_count;
  58         u16     LBA_low;
  59         u16     LBA_mid;
  60         u16     LBA_high;
  61         u8      device;
  62         u8      command;
  63         u32     is_ext;
  64         u32     proto;
  65         u32     in_out;
  66         u32     size;
  67         u64     buffer;
  68         u32     arglen;
  69 };
  70
  71 enum lv1_ata_proto {
  72         NON_DATA_PROTO     = 0,
  73         PIO_DATA_IN_PROTO  = 1,
  74         PIO_DATA_OUT_PROTO = 2,
  75         DMA_PROTO = 3
  76 };
  77
  78 enum lv1_ata_in_out {
  79         DIR_WRITE = 0,                  /* memory -> device */
  80         DIR_READ = 1                    /* device -> memory */
  81 };
  82
  83 static int ps3disk_major;
  84
  85
  86 static const struct block_device_operations ps3disk_fops = {
  87         .owner          = THIS_MODULE,
  88 };
  89
  90
  91 static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
  92                                    struct request *req, int gather)
  93 {
  94         unsigned int offset = 0;
  95         struct req_iterator iter;
  96         struct bio_vec *bvec;
  97         unsigned int i = 0;
  98         size_t size;
  99         void *buf;
 100
 101         rq_for_each_segment(bvec, req, iter) {
 102                 unsigned long flags;
 103                 dev_dbg(&dev->sbd.core,
 104                         "%s:%u: bio %u: %u segs %u sectors from %lu\n",
 105                         __func__, __LINE__, i, bio_segments(iter.bio),
 106                         bio_sectors(iter.bio), 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(buf, &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 = ps3_system_bus_get_drvdata(&dev->sbd);
 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 %u sectors\n",
 139                 __func__, __LINE__, op, n, blk_rq_sectors(req));
 140 #endif
 141
 142         start_sector = blk_rq_pos(req) * priv->blocking_factor;
 143         sectors = blk_rq_sectors(req) * priv->blocking_factor;
 144         dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\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                 __blk_end_request_all(req, -EIO);
 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 = ps3_system_bus_get_drvdata(&dev->sbd);
 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%llx\n",
 182                         __func__, __LINE__, res);
 183                 __blk_end_request_all(req, -EIO);
 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 = blk_fetch_request(q))) {
 199                 if (req->cmd_flags & REQ_FLUSH) {
 200                         if (ps3disk_submit_flush_request(dev, req))
 201                                 break;
 202                 } else if (req->cmd_type == REQ_TYPE_FS) {
 203                         if (ps3disk_submit_request_sg(dev, req))
 204                                 break;
 205                 } else {
 206                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
 207                         __blk_end_request_all(req, -EIO);
 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 = ps3_system_bus_get_drvdata(&dev->sbd);
 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         const char *op;
 234
 235         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
 236
 237         if (tag != dev->tag)
 238                 dev_err(&dev->sbd.core,
 239                         "%s:%u: tag mismatch, got %llx, expected %llx\n",
 240                         __func__, __LINE__, tag, dev->tag);
 241
 242         if (res) {
 243                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
 244                         __func__, __LINE__, res, status);
 245                 return IRQ_HANDLED;
 246         }
 247
 248         priv = ps3_system_bus_get_drvdata(&dev->sbd);
 249         req = priv->req;
 250         if (!req) {
 251                 dev_dbg(&dev->sbd.core,
 252                         "%s:%u non-block layer request completed\n", __func__,
 253                         __LINE__);
 254                 dev->lv1_status = status;
 255                 complete(&dev->done);
 256                 return IRQ_HANDLED;
 257         }
 258
 259         if (req->cmd_flags & REQ_FLUSH) {
 260                 read = 0;
 261                 op = "flush";
 262         } else {
 263                 read = !rq_data_dir(req);
 264                 op = read ? "read" : "write";
 265         }
 266         if (status) {
 267                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
 268                         __LINE__, op, status);
 269                 error = -EIO;
 270         } else {
 271                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
 272                         __LINE__, op);
 273                 error = 0;
 274                 if (read)
 275                         ps3disk_scatter_gather(dev, req, 0);
 276         }
 277
 278         spin_lock(&priv->lock);
 279         __blk_end_request_all(req, error);
 280         priv->req = NULL;
 281         ps3disk_do_request(dev, priv->queue);
 282         spin_unlock(&priv->lock);
 283
 284         return IRQ_HANDLED;
 285 }
 286
 287 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
 288 {
 289         u64 res;
 290
 291         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
 292
 293         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
 294         if (res) {
 295                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
 296                         __func__, __LINE__, res);
 297                 return -EIO;
 298         }
 299         return 0;
 300 }
 301
 302
 303 /* ATA helpers copied from drivers/ata/libata-core.c */
 304
 305 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
 306 {
 307 #ifdef __BIG_ENDIAN
 308         unsigned int i;
 309
 310         for (i = 0; i < buf_words; i++)
 311                 buf[i] = le16_to_cpu(buf[i]);
 312 #endif /* __BIG_ENDIAN */
 313 }
 314
 315 static u64 ata_id_n_sectors(const u16 *id)
 316 {
 317         if (ata_id_has_lba(id)) {
 318                 if (ata_id_has_lba48(id))
 319                         return ata_id_u64(id, 100);
 320                 else
 321                         return ata_id_u32(id, 60);
 322         } else {
 323                 if (ata_id_current_chs_valid(id))
 324                         return ata_id_u32(id, 57);
 325                 else
 326                         return id[1] * id[3] * id[6];
 327         }
 328 }
 329
 330 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
 331                           unsigned int len)
 332 {
 333         unsigned int c;
 334
 335         while (len > 0) {
 336                 c = id[ofs] >> 8;
 337                 *s = c;
 338                 s++;
 339
 340                 c = id[ofs] & 0xff;
 341                 *s = c;
 342                 s++;
 343
 344                 ofs++;
 345                 len -= 2;
 346         }
 347 }
 348
 349 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
 350                             unsigned int len)
 351 {
 352         unsigned char *p;
 353
 354         WARN_ON(!(len & 1));
 355
 356         ata_id_string(id, s, ofs, len - 1);
 357
 358         p = s + strnlen(s, len - 1);
 359         while (p > s && p[-1] == ' ')
 360                 p--;
 361         *p = '\0';
 362 }
 363
 364 static int ps3disk_identify(struct ps3_storage_device *dev)
 365 {
 366         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 367         struct lv1_ata_cmnd_block ata_cmnd;
 368         u16 *id = dev->bounce_buf;
 369         u64 res;
 370
 371         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
 372
 373         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
 374         ata_cmnd.command = ATA_CMD_ID_ATA;
 375         ata_cmnd.sector_count = 1;
 376         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
 377         ata_cmnd.buffer = dev->bounce_lpar;
 378         ata_cmnd.proto = PIO_DATA_IN_PROTO;
 379         ata_cmnd.in_out = DIR_READ;
 380
 381         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
 382                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
 383                                    sizeof(ata_cmnd), ata_cmnd.buffer,
 384                                    ata_cmnd.arglen);
 385         if (res) {
 386                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
 387                         __func__, __LINE__, res);
 388                 return -EIO;
 389         }
 390
 391         swap_buf_le16(id, ATA_ID_WORDS);
 392
 393         /* All we're interested in are raw capacity and model name */
 394         priv->raw_capacity = ata_id_n_sectors(id);
 395         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
 396         return 0;
 397 }
 398
 399 static unsigned long ps3disk_mask;
 400
 401 static DEFINE_MUTEX(ps3disk_mask_mutex);
 402
 403 static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
 404 {
 405         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 406         struct ps3disk_private *priv;
 407         int error;
 408         unsigned int devidx;
 409         struct request_queue *queue;
 410         struct gendisk *gendisk;
 411
 412         if (dev->blk_size < 512) {
 413                 dev_err(&dev->sbd.core,
 414                         "%s:%u: cannot handle block size %llu\n", __func__,
 415                         __LINE__, dev->blk_size);
 416                 return -EINVAL;
 417         }
 418
 419         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
 420         mutex_lock(&ps3disk_mask_mutex);
 421         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
 422         if (devidx >= PS3DISK_MAX_DISKS) {
 423                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
 424                         __LINE__);
 425                 mutex_unlock(&ps3disk_mask_mutex);
 426                 return -ENOSPC;
 427         }
 428         __set_bit(devidx, &ps3disk_mask);
 429         mutex_unlock(&ps3disk_mask_mutex);
 430
 431         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 432         if (!priv) {
 433                 error = -ENOMEM;
 434                 goto fail;
 435         }
 436
 437         ps3_system_bus_set_drvdata(_dev, priv);
 438         spin_lock_init(&priv->lock);
 439
 440         dev->bounce_size = BOUNCE_SIZE;
 441         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 442         if (!dev->bounce_buf) {
 443                 error = -ENOMEM;
 444                 goto fail_free_priv;
 445         }
 446
 447         error = ps3stor_setup(dev, ps3disk_interrupt);
 448         if (error)
 449                 goto fail_free_bounce;
 450
 451         ps3disk_identify(dev);
 452
 453         queue = blk_init_queue(ps3disk_request, &priv->lock);
 454         if (!queue) {
 455                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
 456                         __func__, __LINE__);
 457                 error = -ENOMEM;
 458                 goto fail_teardown;
 459         }
 460
 461         priv->queue = queue;
 462         queue->queuedata = dev;
 463
 464         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
 465
 466         blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9);
 467         blk_queue_segment_boundary(queue, -1UL);
 468         blk_queue_dma_alignment(queue, dev->blk_size-1);
 469         blk_queue_logical_block_size(queue, dev->blk_size);
 470
 471         blk_queue_flush(queue, REQ_FLUSH);
 472
 473         blk_queue_max_segments(queue, -1);
 474         blk_queue_max_segment_size(queue, dev->bounce_size);
 475
 476         gendisk = alloc_disk(PS3DISK_MINORS);
 477         if (!gendisk) {
 478                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
 479                         __LINE__);
 480                 error = -ENOMEM;
 481                 goto fail_cleanup_queue;
 482         }
 483
 484         priv->gendisk = gendisk;
 485         gendisk->major = ps3disk_major;
 486         gendisk->first_minor = devidx * PS3DISK_MINORS;
 487         gendisk->fops = &ps3disk_fops;
 488         gendisk->queue = queue;
 489         gendisk->private_data = dev;
 490         gendisk->driverfs_dev = &dev->sbd.core;
 491         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
 492                  devidx+'a');
 493         priv->blocking_factor = dev->blk_size >> 9;
 494         set_capacity(gendisk,
 495                      dev->regions[dev->region_idx].size*priv->blocking_factor);
 496
 497         dev_info(&dev->sbd.core,
 498                  "%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
 499                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
 500                  get_capacity(gendisk) >> 11);
 501
 502         add_disk(gendisk);
 503         return 0;
 504
 505 fail_cleanup_queue:
 506         blk_cleanup_queue(queue);
 507 fail_teardown:
 508         ps3stor_teardown(dev);
 509 fail_free_bounce:
 510         kfree(dev->bounce_buf);
 511 fail_free_priv:
 512         kfree(priv);
 513         ps3_system_bus_set_drvdata(_dev, NULL);
 514 fail:
 515         mutex_lock(&ps3disk_mask_mutex);
 516         __clear_bit(devidx, &ps3disk_mask);
 517         mutex_unlock(&ps3disk_mask_mutex);
 518         return error;
 519 }
 520
 521 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
 522 {
 523         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 524         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 525
 526         mutex_lock(&ps3disk_mask_mutex);
 527         __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
 528                     &ps3disk_mask);
 529         mutex_unlock(&ps3disk_mask_mutex);
 530         del_gendisk(priv->gendisk);
 531         blk_cleanup_queue(priv->queue);
 532         put_disk(priv->gendisk);
 533         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
 534         ps3disk_sync_cache(dev);
 535         ps3stor_teardown(dev);
 536         kfree(dev->bounce_buf);
 537         kfree(priv);
 538         ps3_system_bus_set_drvdata(_dev, NULL);
 539         return 0;
 540 }
 541
 542 static struct ps3_system_bus_driver ps3disk = {
 543         .match_id       = PS3_MATCH_ID_STOR_DISK,
 544         .core.name      = DEVICE_NAME,
 545         .core.owner     = THIS_MODULE,
 546         .probe          = ps3disk_probe,
 547         .remove         = ps3disk_remove,
 548         .shutdown       = ps3disk_remove,
 549 };
 550
 551
 552 static int __init ps3disk_init(void)
 553 {
 554         int error;
 555
 556         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 557                 return -ENODEV;
 558
 559         error = register_blkdev(0, DEVICE_NAME);
 560         if (error <= 0) {
 561                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
 562                        __LINE__, error);
 563                 return error;
 564         }
 565         ps3disk_major = error;
 566
 567         pr_info("%s:%u: registered block device major %d\n", __func__,
 568                 __LINE__, ps3disk_major);
 569
 570         error = ps3_system_bus_driver_register(&ps3disk);
 571         if (error)
 572                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
 573
 574         return error;
 575 }
 576
 577 static void __exit ps3disk_exit(void)
 578 {
 579         ps3_system_bus_driver_unregister(&ps3disk);
 580         unregister_blkdev(ps3disk_major, DEVICE_NAME);
 581 }
 582
 583 module_init(ps3disk_init);
 584 module_exit(ps3disk_exit);
 585
 586 MODULE_LICENSE("GPL");
 587 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
 588 MODULE_AUTHOR("Sony Corporation");
 589 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);