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 #include <linux/module.h>
  25
  26 #include <asm/lv1call.h>
  27 #include <asm/ps3stor.h>
  28 #include <asm/firmware.h>
  29
  30
  31 #define DEVICE_NAME             "ps3disk"
  32
  33 #define BOUNCE_SIZE             (64*1024)
  34
  35 #define PS3DISK_MAX_DISKS       16
  36 #define PS3DISK_MINORS          16
  37
  38
  39 #define PS3DISK_NAME            "ps3d%c"
  40
  41
  42 struct ps3disk_private {
  43         spinlock_t lock;                /* Request queue spinlock */
  44         struct request_queue *queue;
  45         struct gendisk *gendisk;
  46         unsigned int blocking_factor;
  47         struct request *req;
  48         u64 raw_capacity;
  49         unsigned char model[ATA_ID_PROD_LEN+1];
  50 };
  51
  52
  53 #define LV1_STORAGE_SEND_ATA_COMMAND    (2)
  54 #define LV1_STORAGE_ATA_HDDOUT          (0x23)
  55
  56 struct lv1_ata_cmnd_block {
  57         u16     features;
  58         u16     sector_count;
  59         u16     LBA_low;
  60         u16     LBA_mid;
  61         u16     LBA_high;
  62         u8      device;
  63         u8      command;
  64         u32     is_ext;
  65         u32     proto;
  66         u32     in_out;
  67         u32     size;
  68         u64     buffer;
  69         u32     arglen;
  70 };
  71
  72 enum lv1_ata_proto {
  73         NON_DATA_PROTO     = 0,
  74         PIO_DATA_IN_PROTO  = 1,
  75         PIO_DATA_OUT_PROTO = 2,
  76         DMA_PROTO = 3
  77 };
  78
  79 enum lv1_ata_in_out {
  80         DIR_WRITE = 0,                  /* memory -> device */
  81         DIR_READ = 1                    /* device -> memory */
  82 };
  83
  84 static int ps3disk_major;
  85
  86
  87 static const struct block_device_operations ps3disk_fops = {
  88         .owner          = THIS_MODULE,
  89 };
  90
  91
  92 static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
  93                                    struct request *req, int gather)
  94 {
  95         unsigned int offset = 0;
  96         struct req_iterator iter;
  97         struct bio_vec *bvec;
  98         unsigned int i = 0;
  99         size_t size;
 100         void *buf;
 101
 102         rq_for_each_segment(bvec, req, iter) {
 103                 unsigned long flags;
 104                 dev_dbg(&dev->sbd.core,
 105                         "%s:%u: bio %u: %u segs %u sectors from %lu\n",
 106                         __func__, __LINE__, i, bio_segments(iter.bio),
 107                         bio_sectors(iter.bio), iter.bio->bi_sector);
 108
 109                 size = bvec->bv_len;
 110                 buf = bvec_kmap_irq(bvec, &flags);
 111                 if (gather)
 112                         memcpy(dev->bounce_buf+offset, buf, size);
 113                 else
 114                         memcpy(buf, dev->bounce_buf+offset, size);
 115                 offset += size;
 116                 flush_kernel_dcache_page(bvec->bv_page);
 117                 bvec_kunmap_irq(buf, &flags);
 118                 i++;
 119         }
 120 }
 121
 122 static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
 123                                      struct request *req)
 124 {
 125         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 126         int write = rq_data_dir(req), res;
 127         const char *op = write ? "write" : "read";
 128         u64 start_sector, sectors;
 129         unsigned int region_id = dev->regions[dev->region_idx].id;
 130
 131 #ifdef DEBUG
 132         unsigned int n = 0;
 133         struct bio_vec *bv;
 134         struct req_iterator iter;
 135
 136         rq_for_each_segment(bv, req, iter)
 137                 n++;
 138         dev_dbg(&dev->sbd.core,
 139                 "%s:%u: %s req has %u bvecs for %u sectors\n",
 140                 __func__, __LINE__, op, n, blk_rq_sectors(req));
 141 #endif
 142
 143         start_sector = blk_rq_pos(req) * priv->blocking_factor;
 144         sectors = blk_rq_sectors(req) * priv->blocking_factor;
 145         dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\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                 __blk_end_request_all(req, -EIO);
 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 = ps3_system_bus_get_drvdata(&dev->sbd);
 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%llx\n",
 183                         __func__, __LINE__, res);
 184                 __blk_end_request_all(req, -EIO);
 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 = blk_fetch_request(q))) {
 200                 if (req->cmd_flags & REQ_FLUSH) {
 201                         if (ps3disk_submit_flush_request(dev, req))
 202                                 break;
 203                 } else if (req->cmd_type == REQ_TYPE_FS) {
 204                         if (ps3disk_submit_request_sg(dev, req))
 205                                 break;
 206                 } else {
 207                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
 208                         __blk_end_request_all(req, -EIO);
 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 = ps3_system_bus_get_drvdata(&dev->sbd);
 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         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 %llx, expected %llx\n",
 241                         __func__, __LINE__, tag, dev->tag);
 242
 243         if (res) {
 244                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
 245                         __func__, __LINE__, res, status);
 246                 return IRQ_HANDLED;
 247         }
 248
 249         priv = ps3_system_bus_get_drvdata(&dev->sbd);
 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_flags & REQ_FLUSH) {
 261                 read = 0;
 262                 op = "flush";
 263         } else {
 264                 read = !rq_data_dir(req);
 265                 op = read ? "read" : "write";
 266         }
 267         if (status) {
 268                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
 269                         __LINE__, op, status);
 270                 error = -EIO;
 271         } else {
 272                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
 273                         __LINE__, op);
 274                 error = 0;
 275                 if (read)
 276                         ps3disk_scatter_gather(dev, req, 0);
 277         }
 278
 279         spin_lock(&priv->lock);
 280         __blk_end_request_all(req, error);
 281         priv->req = NULL;
 282         ps3disk_do_request(dev, priv->queue);
 283         spin_unlock(&priv->lock);
 284
 285         return IRQ_HANDLED;
 286 }
 287
 288 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
 289 {
 290         u64 res;
 291
 292         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
 293
 294         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
 295         if (res) {
 296                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
 297                         __func__, __LINE__, res);
 298                 return -EIO;
 299         }
 300         return 0;
 301 }
 302
 303
 304 /* ATA helpers copied from drivers/ata/libata-core.c */
 305
 306 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
 307 {
 308 #ifdef __BIG_ENDIAN
 309         unsigned int i;
 310
 311         for (i = 0; i < buf_words; i++)
 312                 buf[i] = le16_to_cpu(buf[i]);
 313 #endif /* __BIG_ENDIAN */
 314 }
 315
 316 static u64 ata_id_n_sectors(const u16 *id)
 317 {
 318         if (ata_id_has_lba(id)) {
 319                 if (ata_id_has_lba48(id))
 320                         return ata_id_u64(id, 100);
 321                 else
 322                         return ata_id_u32(id, 60);
 323         } else {
 324                 if (ata_id_current_chs_valid(id))
 325                         return ata_id_u32(id, 57);
 326                 else
 327                         return id[1] * id[3] * id[6];
 328         }
 329 }
 330
 331 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
 332                           unsigned int len)
 333 {
 334         unsigned int c;
 335
 336         while (len > 0) {
 337                 c = id[ofs] >> 8;
 338                 *s = c;
 339                 s++;
 340
 341                 c = id[ofs] & 0xff;
 342                 *s = c;
 343                 s++;
 344
 345                 ofs++;
 346                 len -= 2;
 347         }
 348 }
 349
 350 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
 351                             unsigned int len)
 352 {
 353         unsigned char *p;
 354
 355         WARN_ON(!(len & 1));
 356
 357         ata_id_string(id, s, ofs, len - 1);
 358
 359         p = s + strnlen(s, len - 1);
 360         while (p > s && p[-1] == ' ')
 361                 p--;
 362         *p = '\0';
 363 }
 364
 365 static int ps3disk_identify(struct ps3_storage_device *dev)
 366 {
 367         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 368         struct lv1_ata_cmnd_block ata_cmnd;
 369         u16 *id = dev->bounce_buf;
 370         u64 res;
 371
 372         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
 373
 374         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
 375         ata_cmnd.command = ATA_CMD_ID_ATA;
 376         ata_cmnd.sector_count = 1;
 377         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
 378         ata_cmnd.buffer = dev->bounce_lpar;
 379         ata_cmnd.proto = PIO_DATA_IN_PROTO;
 380         ata_cmnd.in_out = DIR_READ;
 381
 382         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
 383                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
 384                                    sizeof(ata_cmnd), ata_cmnd.buffer,
 385                                    ata_cmnd.arglen);
 386         if (res) {
 387                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
 388                         __func__, __LINE__, res);
 389                 return -EIO;
 390         }
 391
 392         swap_buf_le16(id, ATA_ID_WORDS);
 393
 394         /* All we're interested in are raw capacity and model name */
 395         priv->raw_capacity = ata_id_n_sectors(id);
 396         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
 397         return 0;
 398 }
 399
 400 static unsigned long ps3disk_mask;
 401
 402 static DEFINE_MUTEX(ps3disk_mask_mutex);
 403
 404 static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
 405 {
 406         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 407         struct ps3disk_private *priv;
 408         int error;
 409         unsigned int devidx;
 410         struct request_queue *queue;
 411         struct gendisk *gendisk;
 412
 413         if (dev->blk_size < 512) {
 414                 dev_err(&dev->sbd.core,
 415                         "%s:%u: cannot handle block size %llu\n", __func__,
 416                         __LINE__, dev->blk_size);
 417                 return -EINVAL;
 418         }
 419
 420         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
 421         mutex_lock(&ps3disk_mask_mutex);
 422         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
 423         if (devidx >= PS3DISK_MAX_DISKS) {
 424                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
 425                         __LINE__);
 426                 mutex_unlock(&ps3disk_mask_mutex);
 427                 return -ENOSPC;
 428         }
 429         __set_bit(devidx, &ps3disk_mask);
 430         mutex_unlock(&ps3disk_mask_mutex);
 431
 432         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 433         if (!priv) {
 434                 error = -ENOMEM;
 435                 goto fail;
 436         }
 437
 438         ps3_system_bus_set_drvdata(_dev, priv);
 439         spin_lock_init(&priv->lock);
 440
 441         dev->bounce_size = BOUNCE_SIZE;
 442         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 443         if (!dev->bounce_buf) {
 444                 error = -ENOMEM;
 445                 goto fail_free_priv;
 446         }
 447
 448         error = ps3stor_setup(dev, ps3disk_interrupt);
 449         if (error)
 450                 goto fail_free_bounce;
 451
 452         ps3disk_identify(dev);
 453
 454         queue = blk_init_queue(ps3disk_request, &priv->lock);
 455         if (!queue) {
 456                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
 457                         __func__, __LINE__);
 458                 error = -ENOMEM;
 459                 goto fail_teardown;
 460         }
 461
 462         priv->queue = queue;
 463         queue->queuedata = dev;
 464
 465         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
 466
 467         blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9);
 468         blk_queue_segment_boundary(queue, -1UL);
 469         blk_queue_dma_alignment(queue, dev->blk_size-1);
 470         blk_queue_logical_block_size(queue, dev->blk_size);
 471
 472         blk_queue_flush(queue, REQ_FLUSH);
 473
 474         blk_queue_max_segments(queue, -1);
 475         blk_queue_max_segment_size(queue, dev->bounce_size);
 476
 477         gendisk = alloc_disk(PS3DISK_MINORS);
 478         if (!gendisk) {
 479                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
 480                         __LINE__);
 481                 error = -ENOMEM;
 482                 goto fail_cleanup_queue;
 483         }
 484
 485         priv->gendisk = gendisk;
 486         gendisk->major = ps3disk_major;
 487         gendisk->first_minor = devidx * PS3DISK_MINORS;
 488         gendisk->fops = &ps3disk_fops;
 489         gendisk->queue = queue;
 490         gendisk->private_data = dev;
 491         gendisk->driverfs_dev = &dev->sbd.core;
 492         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
 493                  devidx+'a');
 494         priv->blocking_factor = dev->blk_size >> 9;
 495         set_capacity(gendisk,
 496                      dev->regions[dev->region_idx].size*priv->blocking_factor);
 497
 498         dev_info(&dev->sbd.core,
 499                  "%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
 500                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
 501                  get_capacity(gendisk) >> 11);
 502
 503         add_disk(gendisk);
 504         return 0;
 505
 506 fail_cleanup_queue:
 507         blk_cleanup_queue(queue);
 508 fail_teardown:
 509         ps3stor_teardown(dev);
 510 fail_free_bounce:
 511         kfree(dev->bounce_buf);
 512 fail_free_priv:
 513         kfree(priv);
 514         ps3_system_bus_set_drvdata(_dev, NULL);
 515 fail:
 516         mutex_lock(&ps3disk_mask_mutex);
 517         __clear_bit(devidx, &ps3disk_mask);
 518         mutex_unlock(&ps3disk_mask_mutex);
 519         return error;
 520 }
 521
 522 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
 523 {
 524         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 525         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 526
 527         mutex_lock(&ps3disk_mask_mutex);
 528         __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
 529                     &ps3disk_mask);
 530         mutex_unlock(&ps3disk_mask_mutex);
 531         del_gendisk(priv->gendisk);
 532         blk_cleanup_queue(priv->queue);
 533         put_disk(priv->gendisk);
 534         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
 535         ps3disk_sync_cache(dev);
 536         ps3stor_teardown(dev);
 537         kfree(dev->bounce_buf);
 538         kfree(priv);
 539         ps3_system_bus_set_drvdata(_dev, NULL);
 540         return 0;
 541 }
 542
 543 static struct ps3_system_bus_driver ps3disk = {
 544         .match_id       = PS3_MATCH_ID_STOR_DISK,
 545         .core.name      = DEVICE_NAME,
 546         .core.owner     = THIS_MODULE,
 547         .probe          = ps3disk_probe,
 548         .remove         = ps3disk_remove,
 549         .shutdown       = ps3disk_remove,
 550 };
 551
 552
 553 static int __init ps3disk_init(void)
 554 {
 555         int error;
 556
 557         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 558                 return -ENODEV;
 559
 560         error = register_blkdev(0, DEVICE_NAME);
 561         if (error <= 0) {
 562                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
 563                        __LINE__, error);
 564                 return error;
 565         }
 566         ps3disk_major = error;
 567
 568         pr_info("%s:%u: registered block device major %d\n", __func__,
 569                 __LINE__, ps3disk_major);
 570
 571         error = ps3_system_bus_driver_register(&ps3disk);
 572         if (error)
 573                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
 574
 575         return error;
 576 }
 577
 578 static void __exit ps3disk_exit(void)
 579 {
 580         ps3_system_bus_driver_unregister(&ps3disk);
 581         unregister_blkdev(ps3disk_major, DEVICE_NAME);
 582 }
 583
 584 module_init(ps3disk_init);
 585 module_exit(ps3disk_exit);
 586
 587 MODULE_LICENSE("GPL");
 588 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
 589 MODULE_AUTHOR("Sony Corporation");
 590 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);