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