ps3disk.c revision 6c92e699b56287da582ccb12a64b959b6d6109ba
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 40struct 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 54struct 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 70enum 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 77enum lv1_ata_in_out { 78 DIR_WRITE = 0, /* memory -> device */ 79 DIR_READ = 1 /* device -> memory */ 80}; 81 82static int ps3disk_major; 83 84 85static struct block_device_operations ps3disk_fops = { 86 .owner = THIS_MODULE, 87}; 88 89 90static 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 121static 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 170static 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 192static 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 214static 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 227static 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 295static 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 313static 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 323static 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 338static 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 357static 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 372static 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 407static 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 417static int ps3disk_issue_flush(struct request_queue *q, struct gendisk *gendisk, 418 sector_t *sector) 419{ 420 struct ps3_storage_device *dev = q->queuedata; 421 struct request *req; 422 int res; 423 424 dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__); 425 426 req = blk_get_request(q, WRITE, __GFP_WAIT); 427 ps3disk_prepare_flush(q, req); 428 res = blk_execute_rq(q, gendisk, req, 0); 429 if (res) 430 dev_err(&dev->sbd.core, "%s:%u: flush request failed %d\n", 431 __func__, __LINE__, res); 432 blk_put_request(req); 433 return res; 434} 435 436 437static unsigned long ps3disk_mask; 438 439static DEFINE_MUTEX(ps3disk_mask_mutex); 440 441static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev) 442{ 443 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); 444 struct ps3disk_private *priv; 445 int error; 446 unsigned int devidx; 447 struct request_queue *queue; 448 struct gendisk *gendisk; 449 450 if (dev->blk_size < 512) { 451 dev_err(&dev->sbd.core, 452 "%s:%u: cannot handle block size %lu\n", __func__, 453 __LINE__, dev->blk_size); 454 return -EINVAL; 455 } 456 457 BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG); 458 mutex_lock(&ps3disk_mask_mutex); 459 devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS); 460 if (devidx >= PS3DISK_MAX_DISKS) { 461 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__, 462 __LINE__); 463 mutex_unlock(&ps3disk_mask_mutex); 464 return -ENOSPC; 465 } 466 __set_bit(devidx, &ps3disk_mask); 467 mutex_unlock(&ps3disk_mask_mutex); 468 469 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 470 if (!priv) { 471 error = -ENOMEM; 472 goto fail; 473 } 474 475 dev->sbd.core.driver_data = priv; 476 spin_lock_init(&priv->lock); 477 478 dev->bounce_size = BOUNCE_SIZE; 479 dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA); 480 if (!dev->bounce_buf) { 481 error = -ENOMEM; 482 goto fail_free_priv; 483 } 484 485 error = ps3stor_setup(dev, ps3disk_interrupt); 486 if (error) 487 goto fail_free_bounce; 488 489 ps3disk_identify(dev); 490 491 queue = blk_init_queue(ps3disk_request, &priv->lock); 492 if (!queue) { 493 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n", 494 __func__, __LINE__); 495 error = -ENOMEM; 496 goto fail_teardown; 497 } 498 499 priv->queue = queue; 500 queue->queuedata = dev; 501 502 blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH); 503 504 blk_queue_max_sectors(queue, dev->bounce_size >> 9); 505 blk_queue_segment_boundary(queue, -1UL); 506 blk_queue_dma_alignment(queue, dev->blk_size-1); 507 blk_queue_hardsect_size(queue, dev->blk_size); 508 509 blk_queue_issue_flush_fn(queue, ps3disk_issue_flush); 510 blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH, 511 ps3disk_prepare_flush); 512 513 blk_queue_max_phys_segments(queue, -1); 514 blk_queue_max_hw_segments(queue, -1); 515 blk_queue_max_segment_size(queue, dev->bounce_size); 516 517 gendisk = alloc_disk(PS3DISK_MINORS); 518 if (!gendisk) { 519 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__, 520 __LINE__); 521 error = -ENOMEM; 522 goto fail_cleanup_queue; 523 } 524 525 priv->gendisk = gendisk; 526 gendisk->major = ps3disk_major; 527 gendisk->first_minor = devidx * PS3DISK_MINORS; 528 gendisk->fops = &ps3disk_fops; 529 gendisk->queue = queue; 530 gendisk->private_data = dev; 531 gendisk->driverfs_dev = &dev->sbd.core; 532 snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME, 533 devidx+'a'); 534 priv->blocking_factor = dev->blk_size >> 9; 535 set_capacity(gendisk, 536 dev->regions[dev->region_idx].size*priv->blocking_factor); 537 538 dev_info(&dev->sbd.core, 539 "%s is a %s (%lu MiB total, %lu MiB for OtherOS)\n", 540 gendisk->disk_name, priv->model, priv->raw_capacity >> 11, 541 get_capacity(gendisk) >> 11); 542 543 add_disk(gendisk); 544 return 0; 545 546fail_cleanup_queue: 547 blk_cleanup_queue(queue); 548fail_teardown: 549 ps3stor_teardown(dev); 550fail_free_bounce: 551 kfree(dev->bounce_buf); 552fail_free_priv: 553 kfree(priv); 554 dev->sbd.core.driver_data = NULL; 555fail: 556 mutex_lock(&ps3disk_mask_mutex); 557 __clear_bit(devidx, &ps3disk_mask); 558 mutex_unlock(&ps3disk_mask_mutex); 559 return error; 560} 561 562static int ps3disk_remove(struct ps3_system_bus_device *_dev) 563{ 564 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); 565 struct ps3disk_private *priv = dev->sbd.core.driver_data; 566 567 mutex_lock(&ps3disk_mask_mutex); 568 __clear_bit(priv->gendisk->first_minor / PS3DISK_MINORS, 569 &ps3disk_mask); 570 mutex_unlock(&ps3disk_mask_mutex); 571 del_gendisk(priv->gendisk); 572 blk_cleanup_queue(priv->queue); 573 put_disk(priv->gendisk); 574 dev_notice(&dev->sbd.core, "Synchronizing disk cache\n"); 575 ps3disk_sync_cache(dev); 576 ps3stor_teardown(dev); 577 kfree(dev->bounce_buf); 578 kfree(priv); 579 dev->sbd.core.driver_data = NULL; 580 return 0; 581} 582 583static struct ps3_system_bus_driver ps3disk = { 584 .match_id = PS3_MATCH_ID_STOR_DISK, 585 .core.name = DEVICE_NAME, 586 .core.owner = THIS_MODULE, 587 .probe = ps3disk_probe, 588 .remove = ps3disk_remove, 589 .shutdown = ps3disk_remove, 590}; 591 592 593static int __init ps3disk_init(void) 594{ 595 int error; 596 597 if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) 598 return -ENODEV; 599 600 error = register_blkdev(0, DEVICE_NAME); 601 if (error <= 0) { 602 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__, 603 __LINE__, error); 604 return error; 605 } 606 ps3disk_major = error; 607 608 pr_info("%s:%u: registered block device major %d\n", __func__, 609 __LINE__, ps3disk_major); 610 611 error = ps3_system_bus_driver_register(&ps3disk); 612 if (error) 613 unregister_blkdev(ps3disk_major, DEVICE_NAME); 614 615 return error; 616} 617 618static void __exit ps3disk_exit(void) 619{ 620 ps3_system_bus_driver_unregister(&ps3disk); 621 unregister_blkdev(ps3disk_major, DEVICE_NAME); 622} 623 624module_init(ps3disk_init); 625module_exit(ps3disk_exit); 626 627MODULE_LICENSE("GPL"); 628MODULE_DESCRIPTION("PS3 Disk Storage Driver"); 629MODULE_AUTHOR("Sony Corporation"); 630MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK); 631