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, "%s:%u: bio %u: %u sectors from %lu\n",
 105                         __func__, __LINE__, i, bio_sectors(iter.bio),
 106                         iter.bio->bi_iter.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, BLK_STS_IOERR);
 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, BLK_STS_IOERR);
 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                 switch (req_op(req)) {
 200                 case REQ_OP_FLUSH:
 201                         if (ps3disk_submit_flush_request(dev, req))
 202                                 return;
 203                         break;
 204                 case REQ_OP_READ:
 205                 case REQ_OP_WRITE:
 206                         if (ps3disk_submit_request_sg(dev, req))
 207                                 return;
 208                         break;
 209                 default:
 210                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
 211                         __blk_end_request_all(req, BLK_STS_IOERR);
 212                 }
 213         }
 214 }
 215
 216 static void ps3disk_request(struct request_queue *q)
 217 {
 218         struct ps3_storage_device *dev = q->queuedata;
 219         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 220
 221         if (priv->req) {
 222                 dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
 223                 return;
 224         }
 225
 226         ps3disk_do_request(dev, q);
 227 }
 228
 229 static irqreturn_t ps3disk_interrupt(int irq, void *data)
 230 {
 231         struct ps3_storage_device *dev = data;
 232         struct ps3disk_private *priv;
 233         struct request *req;
 234         int res, read;
 235         blk_status_t error;
 236         u64 tag, status;
 237         const char *op;
 238
 239         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
 240
 241         if (tag != dev->tag)
 242                 dev_err(&dev->sbd.core,
 243                         "%s:%u: tag mismatch, got %llx, expected %llx\n",
 244                         __func__, __LINE__, tag, dev->tag);
 245
 246         if (res) {
 247                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
 248                         __func__, __LINE__, res, status);
 249                 return IRQ_HANDLED;
 250         }
 251
 252         priv = ps3_system_bus_get_drvdata(&dev->sbd);
 253         req = priv->req;
 254         if (!req) {
 255                 dev_dbg(&dev->sbd.core,
 256                         "%s:%u non-block layer request completed\n", __func__,
 257                         __LINE__);
 258                 dev->lv1_status = status;
 259                 complete(&dev->done);
 260                 return IRQ_HANDLED;
 261         }
 262
 263         if (req_op(req) == REQ_OP_FLUSH) {
 264                 read = 0;
 265                 op = "flush";
 266         } else {
 267                 read = !rq_data_dir(req);
 268                 op = read ? "read" : "write";
 269         }
 270         if (status) {
 271                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
 272                         __LINE__, op, status);
 273                 error = BLK_STS_IOERR;
 274         } else {
 275                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
 276                         __LINE__, op);
 277                 error = 0;
 278                 if (read)
 279                         ps3disk_scatter_gather(dev, req, 0);
 280         }
 281
 282         spin_lock(&priv->lock);
 283         __blk_end_request_all(req, error);
 284         priv->req = NULL;
 285         ps3disk_do_request(dev, priv->queue);
 286         spin_unlock(&priv->lock);
 287
 288         return IRQ_HANDLED;
 289 }
 290
 291 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
 292 {
 293         u64 res;
 294
 295         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
 296
 297         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
 298         if (res) {
 299                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
 300                         __func__, __LINE__, res);
 301                 return -EIO;
 302         }
 303         return 0;
 304 }
 305
 306
 307 /* ATA helpers copied from drivers/ata/libata-core.c */
 308
 309 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
 310 {
 311 #ifdef __BIG_ENDIAN
 312         unsigned int i;
 313
 314         for (i = 0; i < buf_words; i++)
 315                 buf[i] = le16_to_cpu(buf[i]);
 316 #endif /* __BIG_ENDIAN */
 317 }
 318
 319 static u64 ata_id_n_sectors(const u16 *id)
 320 {
 321         if (ata_id_has_lba(id)) {
 322                 if (ata_id_has_lba48(id))
 323                         return ata_id_u64(id, 100);
 324                 else
 325                         return ata_id_u32(id, 60);
 326         } else {
 327                 if (ata_id_current_chs_valid(id))
 328                         return ata_id_u32(id, 57);
 329                 else
 330                         return id[1] * id[3] * id[6];
 331         }
 332 }
 333
 334 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
 335                           unsigned int len)
 336 {
 337         unsigned int c;
 338
 339         while (len > 0) {
 340                 c = id[ofs] >> 8;
 341                 *s = c;
 342                 s++;
 343
 344                 c = id[ofs] & 0xff;
 345                 *s = c;
 346                 s++;
 347
 348                 ofs++;
 349                 len -= 2;
 350         }
 351 }
 352
 353 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
 354                             unsigned int len)
 355 {
 356         unsigned char *p;
 357
 358         WARN_ON(!(len & 1));
 359
 360         ata_id_string(id, s, ofs, len - 1);
 361
 362         p = s + strnlen(s, len - 1);
 363         while (p > s && p[-1] == ' ')
 364                 p--;
 365         *p = '\0';
 366 }
 367
 368 static int ps3disk_identify(struct ps3_storage_device *dev)
 369 {
 370         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 371         struct lv1_ata_cmnd_block ata_cmnd;
 372         u16 *id = dev->bounce_buf;
 373         u64 res;
 374
 375         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
 376
 377         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
 378         ata_cmnd.command = ATA_CMD_ID_ATA;
 379         ata_cmnd.sector_count = 1;
 380         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
 381         ata_cmnd.buffer = dev->bounce_lpar;
 382         ata_cmnd.proto = PIO_DATA_IN_PROTO;
 383         ata_cmnd.in_out = DIR_READ;
 384
 385         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
 386                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
 387                                    sizeof(ata_cmnd), ata_cmnd.buffer,
 388                                    ata_cmnd.arglen);
 389         if (res) {
 390                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
 391                         __func__, __LINE__, res);
 392                 return -EIO;
 393         }
 394
 395         swap_buf_le16(id, ATA_ID_WORDS);
 396
 397         /* All we're interested in are raw capacity and model name */
 398         priv->raw_capacity = ata_id_n_sectors(id);
 399         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
 400         return 0;
 401 }
 402
 403 static unsigned long ps3disk_mask;
 404
 405 static DEFINE_MUTEX(ps3disk_mask_mutex);
 406
 407 static int ps3disk_probe(struct ps3_system_bus_device *_dev)
 408 {
 409         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 410         struct ps3disk_private *priv;
 411         int error;
 412         unsigned int devidx;
 413         struct request_queue *queue;
 414         struct gendisk *gendisk;
 415
 416         if (dev->blk_size < 512) {
 417                 dev_err(&dev->sbd.core,
 418                         "%s:%u: cannot handle block size %llu\n", __func__,
 419                         __LINE__, dev->blk_size);
 420                 return -EINVAL;
 421         }
 422
 423         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
 424         mutex_lock(&ps3disk_mask_mutex);
 425         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
 426         if (devidx >= PS3DISK_MAX_DISKS) {
 427                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
 428                         __LINE__);
 429                 mutex_unlock(&ps3disk_mask_mutex);
 430                 return -ENOSPC;
 431         }
 432         __set_bit(devidx, &ps3disk_mask);
 433         mutex_unlock(&ps3disk_mask_mutex);
 434
 435         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 436         if (!priv) {
 437                 error = -ENOMEM;
 438                 goto fail;
 439         }
 440
 441         ps3_system_bus_set_drvdata(_dev, priv);
 442         spin_lock_init(&priv->lock);
 443
 444         dev->bounce_size = BOUNCE_SIZE;
 445         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 446         if (!dev->bounce_buf) {
 447                 error = -ENOMEM;
 448                 goto fail_free_priv;
 449         }
 450
 451         error = ps3stor_setup(dev, ps3disk_interrupt);
 452         if (error)
 453                 goto fail_free_bounce;
 454
 455         ps3disk_identify(dev);
 456
 457         queue = blk_init_queue(ps3disk_request, &priv->lock);
 458         if (!queue) {
 459                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
 460                         __func__, __LINE__);
 461                 error = -ENOMEM;
 462                 goto fail_teardown;
 463         }
 464
 465         priv->queue = queue;
 466         queue->queuedata = dev;
 467
 468         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
 469
 470         blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9);
 471         blk_queue_segment_boundary(queue, -1UL);
 472         blk_queue_dma_alignment(queue, dev->blk_size-1);
 473         blk_queue_logical_block_size(queue, dev->blk_size);
 474
 475         blk_queue_write_cache(queue, true, false);
 476
 477         blk_queue_max_segments(queue, -1);
 478         blk_queue_max_segment_size(queue, dev->bounce_size);
 479
 480         gendisk = alloc_disk(PS3DISK_MINORS);
 481         if (!gendisk) {
 482                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
 483                         __LINE__);
 484                 error = -ENOMEM;
 485                 goto fail_cleanup_queue;
 486         }
 487
 488         priv->gendisk = gendisk;
 489         gendisk->major = ps3disk_major;
 490         gendisk->first_minor = devidx * PS3DISK_MINORS;
 491         gendisk->fops = &ps3disk_fops;
 492         gendisk->queue = queue;
 493         gendisk->private_data = dev;
 494         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
 495                  devidx+'a');
 496         priv->blocking_factor = dev->blk_size >> 9;
 497         set_capacity(gendisk,
 498                      dev->regions[dev->region_idx].size*priv->blocking_factor);
 499
 500         dev_info(&dev->sbd.core,
 501                  "%s is a %s (%llu MiB total, %lu MiB for OtherOS)\n",
 502                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
 503                  get_capacity(gendisk) >> 11);
 504
 505         device_add_disk(&dev->sbd.core, gendisk);
 506         return 0;
 507
 508 fail_cleanup_queue:
 509         blk_cleanup_queue(queue);
 510 fail_teardown:
 511         ps3stor_teardown(dev);
 512 fail_free_bounce:
 513         kfree(dev->bounce_buf);
 514 fail_free_priv:
 515         kfree(priv);
 516         ps3_system_bus_set_drvdata(_dev, NULL);
 517 fail:
 518         mutex_lock(&ps3disk_mask_mutex);
 519         __clear_bit(devidx, &ps3disk_mask);
 520         mutex_unlock(&ps3disk_mask_mutex);
 521         return error;
 522 }
 523
 524 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
 525 {
 526         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 527         struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
 528
 529         mutex_lock(&ps3disk_mask_mutex);
 530         __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
 531                     &ps3disk_mask);
 532         mutex_unlock(&ps3disk_mask_mutex);
 533         del_gendisk(priv->gendisk);
 534         blk_cleanup_queue(priv->queue);
 535         put_disk(priv->gendisk);
 536         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
 537         ps3disk_sync_cache(dev);
 538         ps3stor_teardown(dev);
 539         kfree(dev->bounce_buf);
 540         kfree(priv);
 541         ps3_system_bus_set_drvdata(_dev, NULL);
 542         return 0;
 543 }
 544
 545 static struct ps3_system_bus_driver ps3disk = {
 546         .match_id       = PS3_MATCH_ID_STOR_DISK,
 547         .core.name      = DEVICE_NAME,
 548         .core.owner     = THIS_MODULE,
 549         .probe          = ps3disk_probe,
 550         .remove         = ps3disk_remove,
 551         .shutdown       = ps3disk_remove,
 552 };
 553
 554
 555 static int __init ps3disk_init(void)
 556 {
 557         int error;
 558
 559         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 560                 return -ENODEV;
 561
 562         error = register_blkdev(0, DEVICE_NAME);
 563         if (error <= 0) {
 564                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
 565                        __LINE__, error);
 566                 return error;
 567         }
 568         ps3disk_major = error;
 569
 570         pr_info("%s:%u: registered block device major %d\n", __func__,
 571                 __LINE__, ps3disk_major);
 572
 573         error = ps3_system_bus_driver_register(&ps3disk);
 574         if (error)
 575                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
 576
 577         return error;
 578 }
 579
 580 static void __exit ps3disk_exit(void)
 581 {
 582         ps3_system_bus_driver_unregister(&ps3disk);
 583         unregister_blkdev(ps3disk_major, DEVICE_NAME);
 584 }
 585
 586 module_init(ps3disk_init);
 587 module_exit(ps3disk_exit);
 588
 589 MODULE_LICENSE("GPL");
 590 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
 591 MODULE_AUTHOR("Sony Corporation");
 592 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);