1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * PS3 Disk Storage Driver 4 * 5 * Copyright (C) 2007 Sony Computer Entertainment Inc. 6 * Copyright 2007 Sony Corp. 7 */ 8 9 #include <linux/ata.h> 10 #include <linux/blk-mq.h> 11 #include <linux/slab.h> 12 #include <linux/module.h> 13 14 #include <asm/lv1call.h> 15 #include <asm/ps3stor.h> 16 #include <asm/firmware.h> 17 18 19 #define DEVICE_NAME "ps3disk" 20 21 #define BOUNCE_SIZE (64*1024) 22 23 #define PS3DISK_MAX_DISKS 16 24 #define PS3DISK_MINORS 16 25 26 27 #define PS3DISK_NAME "ps3d%c" 28 29 30 struct ps3disk_private { 31 spinlock_t lock; /* Request queue spinlock */ 32 struct request_queue *queue; 33 struct blk_mq_tag_set tag_set; 34 struct gendisk *gendisk; 35 unsigned int blocking_factor; 36 struct request *req; 37 u64 raw_capacity; 38 unsigned char model[ATA_ID_PROD_LEN+1]; 39 }; 40 41 42 #define LV1_STORAGE_SEND_ATA_COMMAND (2) 43 #define LV1_STORAGE_ATA_HDDOUT (0x23) 44 45 struct lv1_ata_cmnd_block { 46 u16 features; 47 u16 sector_count; 48 u16 LBA_low; 49 u16 LBA_mid; 50 u16 LBA_high; 51 u8 device; 52 u8 command; 53 u32 is_ext; 54 u32 proto; 55 u32 in_out; 56 u32 size; 57 u64 buffer; 58 u32 arglen; 59 }; 60 61 enum lv1_ata_proto { 62 NON_DATA_PROTO = 0, 63 PIO_DATA_IN_PROTO = 1, 64 PIO_DATA_OUT_PROTO = 2, 65 DMA_PROTO = 3 66 }; 67 68 enum lv1_ata_in_out { 69 DIR_WRITE = 0, /* memory -> device */ 70 DIR_READ = 1 /* device -> memory */ 71 }; 72 73 static int ps3disk_major; 74 75 76 static const struct block_device_operations ps3disk_fops = { 77 .owner = THIS_MODULE, 78 }; 79 80 81 static void ps3disk_scatter_gather(struct ps3_storage_device *dev, 82 struct request *req, int gather) 83 { 84 unsigned int offset = 0; 85 struct req_iterator iter; 86 struct bio_vec bvec; 87 unsigned int i = 0; 88 size_t size; 89 void *buf; 90 91 rq_for_each_segment(bvec, req, iter) { 92 unsigned long flags; 93 dev_dbg(&dev->sbd.core, "%s:%u: bio %u: %u sectors from %llu\n", 94 __func__, __LINE__, i, bio_sectors(iter.bio), 95 iter.bio->bi_iter.bi_sector); 96 97 size = bvec.bv_len; 98 buf = bvec_kmap_irq(&bvec, &flags); 99 if (gather) 100 memcpy(dev->bounce_buf+offset, buf, size); 101 else 102 memcpy(buf, dev->bounce_buf+offset, size); 103 offset += size; 104 flush_kernel_dcache_page(bvec.bv_page); 105 bvec_kunmap_irq(buf, &flags); 106 i++; 107 } 108 } 109 110 static blk_status_t ps3disk_submit_request_sg(struct ps3_storage_device *dev, 111 struct request *req) 112 { 113 struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); 114 int write = rq_data_dir(req), res; 115 const char *op = write ? "write" : "read"; 116 u64 start_sector, sectors; 117 unsigned int region_id = dev->regions[dev->region_idx].id; 118 119 #ifdef DEBUG 120 unsigned int n = 0; 121 struct bio_vec bv; 122 struct req_iterator iter; 123 124 rq_for_each_segment(bv, req, iter) 125 n++; 126 dev_dbg(&dev->sbd.core, 127 "%s:%u: %s req has %u bvecs for %u sectors\n", 128 __func__, __LINE__, op, n, blk_rq_sectors(req)); 129 #endif 130 131 start_sector = blk_rq_pos(req) * priv->blocking_factor; 132 sectors = blk_rq_sectors(req) * priv->blocking_factor; 133 dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n", 134 __func__, __LINE__, op, sectors, start_sector); 135 136 if (write) { 137 ps3disk_scatter_gather(dev, req, 1); 138 139 res = lv1_storage_write(dev->sbd.dev_id, region_id, 140 start_sector, sectors, 0, 141 dev->bounce_lpar, &dev->tag); 142 } else { 143 res = lv1_storage_read(dev->sbd.dev_id, region_id, 144 start_sector, sectors, 0, 145 dev->bounce_lpar, &dev->tag); 146 } 147 if (res) { 148 dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__, 149 __LINE__, op, res); 150 return BLK_STS_IOERR; 151 } 152 153 priv->req = req; 154 return BLK_STS_OK; 155 } 156 157 static blk_status_t ps3disk_submit_flush_request(struct ps3_storage_device *dev, 158 struct request *req) 159 { 160 struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); 161 u64 res; 162 163 dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__); 164 165 res = lv1_storage_send_device_command(dev->sbd.dev_id, 166 LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 167 0, &dev->tag); 168 if (res) { 169 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n", 170 __func__, __LINE__, res); 171 return BLK_STS_IOERR; 172 } 173 174 priv->req = req; 175 return BLK_STS_OK; 176 } 177 178 static blk_status_t ps3disk_do_request(struct ps3_storage_device *dev, 179 struct request *req) 180 { 181 dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__); 182 183 switch (req_op(req)) { 184 case REQ_OP_FLUSH: 185 return ps3disk_submit_flush_request(dev, req); 186 case REQ_OP_READ: 187 case REQ_OP_WRITE: 188 return ps3disk_submit_request_sg(dev, req); 189 default: 190 blk_dump_rq_flags(req, DEVICE_NAME " bad request"); 191 return BLK_STS_IOERR; 192 } 193 } 194 195 static blk_status_t ps3disk_queue_rq(struct blk_mq_hw_ctx *hctx, 196 const struct blk_mq_queue_data *bd) 197 { 198 struct request_queue *q = hctx->queue; 199 struct ps3_storage_device *dev = q->queuedata; 200 struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); 201 blk_status_t ret; 202 203 blk_mq_start_request(bd->rq); 204 205 spin_lock_irq(&priv->lock); 206 ret = ps3disk_do_request(dev, bd->rq); 207 spin_unlock_irq(&priv->lock); 208 209 return ret; 210 } 211 212 static irqreturn_t ps3disk_interrupt(int irq, void *data) 213 { 214 struct ps3_storage_device *dev = data; 215 struct ps3disk_private *priv; 216 struct request *req; 217 int res, read; 218 blk_status_t error; 219 u64 tag, status; 220 const char *op; 221 222 res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status); 223 224 if (tag != dev->tag) 225 dev_err(&dev->sbd.core, 226 "%s:%u: tag mismatch, got %llx, expected %llx\n", 227 __func__, __LINE__, tag, dev->tag); 228 229 if (res) { 230 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n", 231 __func__, __LINE__, res, status); 232 return IRQ_HANDLED; 233 } 234 235 priv = ps3_system_bus_get_drvdata(&dev->sbd); 236 req = priv->req; 237 if (!req) { 238 dev_dbg(&dev->sbd.core, 239 "%s:%u non-block layer request completed\n", __func__, 240 __LINE__); 241 dev->lv1_status = status; 242 complete(&dev->done); 243 return IRQ_HANDLED; 244 } 245 246 if (req_op(req) == REQ_OP_FLUSH) { 247 read = 0; 248 op = "flush"; 249 } else { 250 read = !rq_data_dir(req); 251 op = read ? "read" : "write"; 252 } 253 if (status) { 254 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__, 255 __LINE__, op, status); 256 error = BLK_STS_IOERR; 257 } else { 258 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__, 259 __LINE__, op); 260 error = 0; 261 if (read) 262 ps3disk_scatter_gather(dev, req, 0); 263 } 264 265 spin_lock(&priv->lock); 266 priv->req = NULL; 267 blk_mq_end_request(req, error); 268 spin_unlock(&priv->lock); 269 270 blk_mq_run_hw_queues(priv->queue, true); 271 return IRQ_HANDLED; 272 } 273 274 static int ps3disk_sync_cache(struct ps3_storage_device *dev) 275 { 276 u64 res; 277 278 dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__); 279 280 res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0); 281 if (res) { 282 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n", 283 __func__, __LINE__, res); 284 return -EIO; 285 } 286 return 0; 287 } 288 289 290 /* ATA helpers copied from drivers/ata/libata-core.c */ 291 292 static void swap_buf_le16(u16 *buf, unsigned int buf_words) 293 { 294 #ifdef __BIG_ENDIAN 295 unsigned int i; 296 297 for (i = 0; i < buf_words; i++) 298 buf[i] = le16_to_cpu(buf[i]); 299 #endif /* __BIG_ENDIAN */ 300 } 301 302 static u64 ata_id_n_sectors(const u16 *id) 303 { 304 if (ata_id_has_lba(id)) { 305 if (ata_id_has_lba48(id)) 306 return ata_id_u64(id, 100); 307 else 308 return ata_id_u32(id, 60); 309 } else { 310 if (ata_id_current_chs_valid(id)) 311 return ata_id_u32(id, 57); 312 else 313 return id[1] * id[3] * id[6]; 314 } 315 } 316 317 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs, 318 unsigned int len) 319 { 320 unsigned int c; 321 322 while (len > 0) { 323 c = id[ofs] >> 8; 324 *s = c; 325 s++; 326 327 c = id[ofs] & 0xff; 328 *s = c; 329 s++; 330 331 ofs++; 332 len -= 2; 333 } 334 } 335 336 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs, 337 unsigned int len) 338 { 339 unsigned char *p; 340 341 WARN_ON(!(len & 1)); 342 343 ata_id_string(id, s, ofs, len - 1); 344 345 p = s + strnlen(s, len - 1); 346 while (p > s && p[-1] == ' ') 347 p--; 348 *p = '\0'; 349 } 350 351 static int ps3disk_identify(struct ps3_storage_device *dev) 352 { 353 struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); 354 struct lv1_ata_cmnd_block ata_cmnd; 355 u16 *id = dev->bounce_buf; 356 u64 res; 357 358 dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__); 359 360 memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block)); 361 ata_cmnd.command = ATA_CMD_ID_ATA; 362 ata_cmnd.sector_count = 1; 363 ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2; 364 ata_cmnd.buffer = dev->bounce_lpar; 365 ata_cmnd.proto = PIO_DATA_IN_PROTO; 366 ata_cmnd.in_out = DIR_READ; 367 368 res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND, 369 ps3_mm_phys_to_lpar(__pa(&ata_cmnd)), 370 sizeof(ata_cmnd), ata_cmnd.buffer, 371 ata_cmnd.arglen); 372 if (res) { 373 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n", 374 __func__, __LINE__, res); 375 return -EIO; 376 } 377 378 swap_buf_le16(id, ATA_ID_WORDS); 379 380 /* All we're interested in are raw capacity and model name */ 381 priv->raw_capacity = ata_id_n_sectors(id); 382 ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model)); 383 return 0; 384 } 385 386 static unsigned long ps3disk_mask; 387 388 static DEFINE_MUTEX(ps3disk_mask_mutex); 389 390 static const struct blk_mq_ops ps3disk_mq_ops = { 391 .queue_rq = ps3disk_queue_rq, 392 }; 393 394 static int ps3disk_probe(struct ps3_system_bus_device *_dev) 395 { 396 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); 397 struct ps3disk_private *priv; 398 int error; 399 unsigned int devidx; 400 struct request_queue *queue; 401 struct gendisk *gendisk; 402 403 if (dev->blk_size < 512) { 404 dev_err(&dev->sbd.core, 405 "%s:%u: cannot handle block size %llu\n", __func__, 406 __LINE__, dev->blk_size); 407 return -EINVAL; 408 } 409 410 BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG); 411 mutex_lock(&ps3disk_mask_mutex); 412 devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS); 413 if (devidx >= PS3DISK_MAX_DISKS) { 414 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__, 415 __LINE__); 416 mutex_unlock(&ps3disk_mask_mutex); 417 return -ENOSPC; 418 } 419 __set_bit(devidx, &ps3disk_mask); 420 mutex_unlock(&ps3disk_mask_mutex); 421 422 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 423 if (!priv) { 424 error = -ENOMEM; 425 goto fail; 426 } 427 428 ps3_system_bus_set_drvdata(_dev, priv); 429 spin_lock_init(&priv->lock); 430 431 dev->bounce_size = BOUNCE_SIZE; 432 dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA); 433 if (!dev->bounce_buf) { 434 error = -ENOMEM; 435 goto fail_free_priv; 436 } 437 438 error = ps3stor_setup(dev, ps3disk_interrupt); 439 if (error) 440 goto fail_free_bounce; 441 442 ps3disk_identify(dev); 443 444 queue = blk_mq_init_sq_queue(&priv->tag_set, &ps3disk_mq_ops, 1, 445 BLK_MQ_F_SHOULD_MERGE); 446 if (IS_ERR(queue)) { 447 dev_err(&dev->sbd.core, "%s:%u: blk_mq_init_queue failed\n", 448 __func__, __LINE__); 449 error = PTR_ERR(queue); 450 goto fail_teardown; 451 } 452 453 priv->queue = queue; 454 queue->queuedata = dev; 455 456 blk_queue_max_hw_sectors(queue, dev->bounce_size >> 9); 457 blk_queue_dma_alignment(queue, dev->blk_size-1); 458 blk_queue_logical_block_size(queue, dev->blk_size); 459 460 blk_queue_write_cache(queue, true, false); 461 462 blk_queue_max_segments(queue, -1); 463 blk_queue_max_segment_size(queue, dev->bounce_size); 464 465 gendisk = alloc_disk(PS3DISK_MINORS); 466 if (!gendisk) { 467 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__, 468 __LINE__); 469 error = -ENOMEM; 470 goto fail_cleanup_queue; 471 } 472 473 priv->gendisk = gendisk; 474 gendisk->major = ps3disk_major; 475 gendisk->first_minor = devidx * PS3DISK_MINORS; 476 gendisk->fops = &ps3disk_fops; 477 gendisk->queue = queue; 478 gendisk->private_data = dev; 479 snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME, 480 devidx+'a'); 481 priv->blocking_factor = dev->blk_size >> 9; 482 set_capacity(gendisk, 483 dev->regions[dev->region_idx].size*priv->blocking_factor); 484 485 dev_info(&dev->sbd.core, 486 "%s is a %s (%llu MiB total, %llu MiB for OtherOS)\n", 487 gendisk->disk_name, priv->model, priv->raw_capacity >> 11, 488 get_capacity(gendisk) >> 11); 489 490 device_add_disk(&dev->sbd.core, gendisk, NULL); 491 return 0; 492 493 fail_cleanup_queue: 494 blk_cleanup_queue(queue); 495 blk_mq_free_tag_set(&priv->tag_set); 496 fail_teardown: 497 ps3stor_teardown(dev); 498 fail_free_bounce: 499 kfree(dev->bounce_buf); 500 fail_free_priv: 501 kfree(priv); 502 ps3_system_bus_set_drvdata(_dev, NULL); 503 fail: 504 mutex_lock(&ps3disk_mask_mutex); 505 __clear_bit(devidx, &ps3disk_mask); 506 mutex_unlock(&ps3disk_mask_mutex); 507 return error; 508 } 509 510 static void ps3disk_remove(struct ps3_system_bus_device *_dev) 511 { 512 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); 513 struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); 514 515 mutex_lock(&ps3disk_mask_mutex); 516 __clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS, 517 &ps3disk_mask); 518 mutex_unlock(&ps3disk_mask_mutex); 519 del_gendisk(priv->gendisk); 520 blk_cleanup_queue(priv->queue); 521 blk_mq_free_tag_set(&priv->tag_set); 522 put_disk(priv->gendisk); 523 dev_notice(&dev->sbd.core, "Synchronizing disk cache\n"); 524 ps3disk_sync_cache(dev); 525 ps3stor_teardown(dev); 526 kfree(dev->bounce_buf); 527 kfree(priv); 528 ps3_system_bus_set_drvdata(_dev, NULL); 529 } 530 531 static struct ps3_system_bus_driver ps3disk = { 532 .match_id = PS3_MATCH_ID_STOR_DISK, 533 .core.name = DEVICE_NAME, 534 .core.owner = THIS_MODULE, 535 .probe = ps3disk_probe, 536 .remove = ps3disk_remove, 537 .shutdown = ps3disk_remove, 538 }; 539 540 541 static int __init ps3disk_init(void) 542 { 543 int error; 544 545 if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) 546 return -ENODEV; 547 548 error = register_blkdev(0, DEVICE_NAME); 549 if (error <= 0) { 550 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__, 551 __LINE__, error); 552 return error; 553 } 554 ps3disk_major = error; 555 556 pr_info("%s:%u: registered block device major %d\n", __func__, 557 __LINE__, ps3disk_major); 558 559 error = ps3_system_bus_driver_register(&ps3disk); 560 if (error) 561 unregister_blkdev(ps3disk_major, DEVICE_NAME); 562 563 return error; 564 } 565 566 static void __exit ps3disk_exit(void) 567 { 568 ps3_system_bus_driver_unregister(&ps3disk); 569 unregister_blkdev(ps3disk_major, DEVICE_NAME); 570 } 571 572 module_init(ps3disk_init); 573 module_exit(ps3disk_exit); 574 575 MODULE_LICENSE("GPL"); 576 MODULE_DESCRIPTION("PS3 Disk Storage Driver"); 577 MODULE_AUTHOR("Sony Corporation"); 578 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK); 579