1 /* 2 * NVM Express device driver 3 * Copyright (c) 2011-2014, Intel Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms and conditions of the GNU General Public License, 7 * version 2, as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 */ 14 15 #include <linux/aer.h> 16 #include <linux/blkdev.h> 17 #include <linux/blk-mq.h> 18 #include <linux/blk-mq-pci.h> 19 #include <linux/dmi.h> 20 #include <linux/init.h> 21 #include <linux/interrupt.h> 22 #include <linux/io.h> 23 #include <linux/mm.h> 24 #include <linux/module.h> 25 #include <linux/mutex.h> 26 #include <linux/once.h> 27 #include <linux/pci.h> 28 #include <linux/t10-pi.h> 29 #include <linux/types.h> 30 #include <linux/io-64-nonatomic-lo-hi.h> 31 #include <linux/sed-opal.h> 32 33 #include "nvme.h" 34 35 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) 36 #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) 37 38 #define SGES_PER_PAGE (PAGE_SIZE / sizeof(struct nvme_sgl_desc)) 39 40 static int use_threaded_interrupts; 41 module_param(use_threaded_interrupts, int, 0); 42 43 static bool use_cmb_sqes = true; 44 module_param(use_cmb_sqes, bool, 0644); 45 MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); 46 47 static unsigned int max_host_mem_size_mb = 128; 48 module_param(max_host_mem_size_mb, uint, 0444); 49 MODULE_PARM_DESC(max_host_mem_size_mb, 50 "Maximum Host Memory Buffer (HMB) size per controller (in MiB)"); 51 52 static unsigned int sgl_threshold = SZ_32K; 53 module_param(sgl_threshold, uint, 0644); 54 MODULE_PARM_DESC(sgl_threshold, 55 "Use SGLs when average request segment size is larger or equal to " 56 "this size. Use 0 to disable SGLs."); 57 58 static int io_queue_depth_set(const char *val, const struct kernel_param *kp); 59 static const struct kernel_param_ops io_queue_depth_ops = { 60 .set = io_queue_depth_set, 61 .get = param_get_int, 62 }; 63 64 static int io_queue_depth = 1024; 65 module_param_cb(io_queue_depth, &io_queue_depth_ops, &io_queue_depth, 0644); 66 MODULE_PARM_DESC(io_queue_depth, "set io queue depth, should >= 2"); 67 68 struct nvme_dev; 69 struct nvme_queue; 70 71 static void nvme_process_cq(struct nvme_queue *nvmeq); 72 static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown); 73 74 /* 75 * Represents an NVM Express device. Each nvme_dev is a PCI function. 76 */ 77 struct nvme_dev { 78 struct nvme_queue *queues; 79 struct blk_mq_tag_set tagset; 80 struct blk_mq_tag_set admin_tagset; 81 u32 __iomem *dbs; 82 struct device *dev; 83 struct dma_pool *prp_page_pool; 84 struct dma_pool *prp_small_pool; 85 unsigned online_queues; 86 unsigned max_qid; 87 int q_depth; 88 u32 db_stride; 89 void __iomem *bar; 90 unsigned long bar_mapped_size; 91 struct work_struct remove_work; 92 struct mutex shutdown_lock; 93 bool subsystem; 94 void __iomem *cmb; 95 pci_bus_addr_t cmb_bus_addr; 96 u64 cmb_size; 97 u32 cmbsz; 98 u32 cmbloc; 99 struct nvme_ctrl ctrl; 100 struct completion ioq_wait; 101 102 /* shadow doorbell buffer support: */ 103 u32 *dbbuf_dbs; 104 dma_addr_t dbbuf_dbs_dma_addr; 105 u32 *dbbuf_eis; 106 dma_addr_t dbbuf_eis_dma_addr; 107 108 /* host memory buffer support: */ 109 u64 host_mem_size; 110 u32 nr_host_mem_descs; 111 dma_addr_t host_mem_descs_dma; 112 struct nvme_host_mem_buf_desc *host_mem_descs; 113 void **host_mem_desc_bufs; 114 }; 115 116 static int io_queue_depth_set(const char *val, const struct kernel_param *kp) 117 { 118 int n = 0, ret; 119 120 ret = kstrtoint(val, 10, &n); 121 if (ret != 0 || n < 2) 122 return -EINVAL; 123 124 return param_set_int(val, kp); 125 } 126 127 static inline unsigned int sq_idx(unsigned int qid, u32 stride) 128 { 129 return qid * 2 * stride; 130 } 131 132 static inline unsigned int cq_idx(unsigned int qid, u32 stride) 133 { 134 return (qid * 2 + 1) * stride; 135 } 136 137 static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) 138 { 139 return container_of(ctrl, struct nvme_dev, ctrl); 140 } 141 142 /* 143 * An NVM Express queue. Each device has at least two (one for admin 144 * commands and one for I/O commands). 145 */ 146 struct nvme_queue { 147 struct device *q_dmadev; 148 struct nvme_dev *dev; 149 spinlock_t q_lock; 150 struct nvme_command *sq_cmds; 151 struct nvme_command __iomem *sq_cmds_io; 152 volatile struct nvme_completion *cqes; 153 struct blk_mq_tags **tags; 154 dma_addr_t sq_dma_addr; 155 dma_addr_t cq_dma_addr; 156 u32 __iomem *q_db; 157 u16 q_depth; 158 s16 cq_vector; 159 u16 sq_tail; 160 u16 cq_head; 161 u16 qid; 162 u8 cq_phase; 163 u8 cqe_seen; 164 u32 *dbbuf_sq_db; 165 u32 *dbbuf_cq_db; 166 u32 *dbbuf_sq_ei; 167 u32 *dbbuf_cq_ei; 168 }; 169 170 /* 171 * The nvme_iod describes the data in an I/O, including the list of PRP 172 * entries. You can't see it in this data structure because C doesn't let 173 * me express that. Use nvme_init_iod to ensure there's enough space 174 * allocated to store the PRP list. 175 */ 176 struct nvme_iod { 177 struct nvme_request req; 178 struct nvme_queue *nvmeq; 179 bool use_sgl; 180 int aborted; 181 int npages; /* In the PRP list. 0 means small pool in use */ 182 int nents; /* Used in scatterlist */ 183 int length; /* Of data, in bytes */ 184 dma_addr_t first_dma; 185 struct scatterlist meta_sg; /* metadata requires single contiguous buffer */ 186 struct scatterlist *sg; 187 struct scatterlist inline_sg[0]; 188 }; 189 190 /* 191 * Check we didin't inadvertently grow the command struct 192 */ 193 static inline void _nvme_check_size(void) 194 { 195 BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); 196 BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); 197 BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); 198 BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); 199 BUILD_BUG_ON(sizeof(struct nvme_features) != 64); 200 BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); 201 BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); 202 BUILD_BUG_ON(sizeof(struct nvme_command) != 64); 203 BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE); 204 BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE); 205 BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); 206 BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); 207 BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64); 208 } 209 210 static inline unsigned int nvme_dbbuf_size(u32 stride) 211 { 212 return ((num_possible_cpus() + 1) * 8 * stride); 213 } 214 215 static int nvme_dbbuf_dma_alloc(struct nvme_dev *dev) 216 { 217 unsigned int mem_size = nvme_dbbuf_size(dev->db_stride); 218 219 if (dev->dbbuf_dbs) 220 return 0; 221 222 dev->dbbuf_dbs = dma_alloc_coherent(dev->dev, mem_size, 223 &dev->dbbuf_dbs_dma_addr, 224 GFP_KERNEL); 225 if (!dev->dbbuf_dbs) 226 return -ENOMEM; 227 dev->dbbuf_eis = dma_alloc_coherent(dev->dev, mem_size, 228 &dev->dbbuf_eis_dma_addr, 229 GFP_KERNEL); 230 if (!dev->dbbuf_eis) { 231 dma_free_coherent(dev->dev, mem_size, 232 dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr); 233 dev->dbbuf_dbs = NULL; 234 return -ENOMEM; 235 } 236 237 return 0; 238 } 239 240 static void nvme_dbbuf_dma_free(struct nvme_dev *dev) 241 { 242 unsigned int mem_size = nvme_dbbuf_size(dev->db_stride); 243 244 if (dev->dbbuf_dbs) { 245 dma_free_coherent(dev->dev, mem_size, 246 dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr); 247 dev->dbbuf_dbs = NULL; 248 } 249 if (dev->dbbuf_eis) { 250 dma_free_coherent(dev->dev, mem_size, 251 dev->dbbuf_eis, dev->dbbuf_eis_dma_addr); 252 dev->dbbuf_eis = NULL; 253 } 254 } 255 256 static void nvme_dbbuf_init(struct nvme_dev *dev, 257 struct nvme_queue *nvmeq, int qid) 258 { 259 if (!dev->dbbuf_dbs || !qid) 260 return; 261 262 nvmeq->dbbuf_sq_db = &dev->dbbuf_dbs[sq_idx(qid, dev->db_stride)]; 263 nvmeq->dbbuf_cq_db = &dev->dbbuf_dbs[cq_idx(qid, dev->db_stride)]; 264 nvmeq->dbbuf_sq_ei = &dev->dbbuf_eis[sq_idx(qid, dev->db_stride)]; 265 nvmeq->dbbuf_cq_ei = &dev->dbbuf_eis[cq_idx(qid, dev->db_stride)]; 266 } 267 268 static void nvme_dbbuf_set(struct nvme_dev *dev) 269 { 270 struct nvme_command c; 271 272 if (!dev->dbbuf_dbs) 273 return; 274 275 memset(&c, 0, sizeof(c)); 276 c.dbbuf.opcode = nvme_admin_dbbuf; 277 c.dbbuf.prp1 = cpu_to_le64(dev->dbbuf_dbs_dma_addr); 278 c.dbbuf.prp2 = cpu_to_le64(dev->dbbuf_eis_dma_addr); 279 280 if (nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0)) { 281 dev_warn(dev->ctrl.device, "unable to set dbbuf\n"); 282 /* Free memory and continue on */ 283 nvme_dbbuf_dma_free(dev); 284 } 285 } 286 287 static inline int nvme_dbbuf_need_event(u16 event_idx, u16 new_idx, u16 old) 288 { 289 return (u16)(new_idx - event_idx - 1) < (u16)(new_idx - old); 290 } 291 292 /* Update dbbuf and return true if an MMIO is required */ 293 static bool nvme_dbbuf_update_and_check_event(u16 value, u32 *dbbuf_db, 294 volatile u32 *dbbuf_ei) 295 { 296 if (dbbuf_db) { 297 u16 old_value; 298 299 /* 300 * Ensure that the queue is written before updating 301 * the doorbell in memory 302 */ 303 wmb(); 304 305 old_value = *dbbuf_db; 306 *dbbuf_db = value; 307 308 if (!nvme_dbbuf_need_event(*dbbuf_ei, value, old_value)) 309 return false; 310 } 311 312 return true; 313 } 314 315 /* 316 * Max size of iod being embedded in the request payload 317 */ 318 #define NVME_INT_PAGES 2 319 #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size) 320 321 /* 322 * Will slightly overestimate the number of pages needed. This is OK 323 * as it only leads to a small amount of wasted memory for the lifetime of 324 * the I/O. 325 */ 326 static int nvme_npages(unsigned size, struct nvme_dev *dev) 327 { 328 unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size, 329 dev->ctrl.page_size); 330 return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); 331 } 332 333 /* 334 * Calculates the number of pages needed for the SGL segments. For example a 4k 335 * page can accommodate 256 SGL descriptors. 336 */ 337 static int nvme_pci_npages_sgl(unsigned int num_seg) 338 { 339 return DIV_ROUND_UP(num_seg * sizeof(struct nvme_sgl_desc), PAGE_SIZE); 340 } 341 342 static unsigned int nvme_pci_iod_alloc_size(struct nvme_dev *dev, 343 unsigned int size, unsigned int nseg, bool use_sgl) 344 { 345 size_t alloc_size; 346 347 if (use_sgl) 348 alloc_size = sizeof(__le64 *) * nvme_pci_npages_sgl(nseg); 349 else 350 alloc_size = sizeof(__le64 *) * nvme_npages(size, dev); 351 352 return alloc_size + sizeof(struct scatterlist) * nseg; 353 } 354 355 static unsigned int nvme_pci_cmd_size(struct nvme_dev *dev, bool use_sgl) 356 { 357 unsigned int alloc_size = nvme_pci_iod_alloc_size(dev, 358 NVME_INT_BYTES(dev), NVME_INT_PAGES, 359 use_sgl); 360 361 return sizeof(struct nvme_iod) + alloc_size; 362 } 363 364 static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 365 unsigned int hctx_idx) 366 { 367 struct nvme_dev *dev = data; 368 struct nvme_queue *nvmeq = &dev->queues[0]; 369 370 WARN_ON(hctx_idx != 0); 371 WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); 372 WARN_ON(nvmeq->tags); 373 374 hctx->driver_data = nvmeq; 375 nvmeq->tags = &dev->admin_tagset.tags[0]; 376 return 0; 377 } 378 379 static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) 380 { 381 struct nvme_queue *nvmeq = hctx->driver_data; 382 383 nvmeq->tags = NULL; 384 } 385 386 static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 387 unsigned int hctx_idx) 388 { 389 struct nvme_dev *dev = data; 390 struct nvme_queue *nvmeq = &dev->queues[hctx_idx + 1]; 391 392 if (!nvmeq->tags) 393 nvmeq->tags = &dev->tagset.tags[hctx_idx]; 394 395 WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); 396 hctx->driver_data = nvmeq; 397 return 0; 398 } 399 400 static int nvme_init_request(struct blk_mq_tag_set *set, struct request *req, 401 unsigned int hctx_idx, unsigned int numa_node) 402 { 403 struct nvme_dev *dev = set->driver_data; 404 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 405 int queue_idx = (set == &dev->tagset) ? hctx_idx + 1 : 0; 406 struct nvme_queue *nvmeq = &dev->queues[queue_idx]; 407 408 BUG_ON(!nvmeq); 409 iod->nvmeq = nvmeq; 410 return 0; 411 } 412 413 static int nvme_pci_map_queues(struct blk_mq_tag_set *set) 414 { 415 struct nvme_dev *dev = set->driver_data; 416 417 return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev), 0); 418 } 419 420 /** 421 * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell 422 * @nvmeq: The queue to use 423 * @cmd: The command to send 424 * 425 * Safe to use from interrupt context 426 */ 427 static void __nvme_submit_cmd(struct nvme_queue *nvmeq, 428 struct nvme_command *cmd) 429 { 430 u16 tail = nvmeq->sq_tail; 431 432 if (nvmeq->sq_cmds_io) 433 memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); 434 else 435 memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); 436 437 if (++tail == nvmeq->q_depth) 438 tail = 0; 439 if (nvme_dbbuf_update_and_check_event(tail, nvmeq->dbbuf_sq_db, 440 nvmeq->dbbuf_sq_ei)) 441 writel(tail, nvmeq->q_db); 442 nvmeq->sq_tail = tail; 443 } 444 445 static void **nvme_pci_iod_list(struct request *req) 446 { 447 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 448 return (void **)(iod->sg + blk_rq_nr_phys_segments(req)); 449 } 450 451 static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) 452 { 453 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 454 int nseg = blk_rq_nr_phys_segments(req); 455 unsigned int avg_seg_size; 456 457 if (nseg == 0) 458 return false; 459 460 avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), nseg); 461 462 if (!(dev->ctrl.sgls & ((1 << 0) | (1 << 1)))) 463 return false; 464 if (!iod->nvmeq->qid) 465 return false; 466 if (!sgl_threshold || avg_seg_size < sgl_threshold) 467 return false; 468 return true; 469 } 470 471 static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) 472 { 473 struct nvme_iod *iod = blk_mq_rq_to_pdu(rq); 474 int nseg = blk_rq_nr_phys_segments(rq); 475 unsigned int size = blk_rq_payload_bytes(rq); 476 477 iod->use_sgl = nvme_pci_use_sgls(dev, rq); 478 479 if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { 480 size_t alloc_size = nvme_pci_iod_alloc_size(dev, size, nseg, 481 iod->use_sgl); 482 483 iod->sg = kmalloc(alloc_size, GFP_ATOMIC); 484 if (!iod->sg) 485 return BLK_STS_RESOURCE; 486 } else { 487 iod->sg = iod->inline_sg; 488 } 489 490 iod->aborted = 0; 491 iod->npages = -1; 492 iod->nents = 0; 493 iod->length = size; 494 495 return BLK_STS_OK; 496 } 497 498 static void nvme_free_iod(struct nvme_dev *dev, struct request *req) 499 { 500 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 501 const int last_prp = dev->ctrl.page_size / sizeof(__le64) - 1; 502 dma_addr_t dma_addr = iod->first_dma, next_dma_addr; 503 504 int i; 505 506 if (iod->npages == 0) 507 dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], 508 dma_addr); 509 510 for (i = 0; i < iod->npages; i++) { 511 void *addr = nvme_pci_iod_list(req)[i]; 512 513 if (iod->use_sgl) { 514 struct nvme_sgl_desc *sg_list = addr; 515 516 next_dma_addr = 517 le64_to_cpu((sg_list[SGES_PER_PAGE - 1]).addr); 518 } else { 519 __le64 *prp_list = addr; 520 521 next_dma_addr = le64_to_cpu(prp_list[last_prp]); 522 } 523 524 dma_pool_free(dev->prp_page_pool, addr, dma_addr); 525 dma_addr = next_dma_addr; 526 } 527 528 if (iod->sg != iod->inline_sg) 529 kfree(iod->sg); 530 } 531 532 #ifdef CONFIG_BLK_DEV_INTEGRITY 533 static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 534 { 535 if (be32_to_cpu(pi->ref_tag) == v) 536 pi->ref_tag = cpu_to_be32(p); 537 } 538 539 static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 540 { 541 if (be32_to_cpu(pi->ref_tag) == p) 542 pi->ref_tag = cpu_to_be32(v); 543 } 544 545 /** 546 * nvme_dif_remap - remaps ref tags to bip seed and physical lba 547 * 548 * The virtual start sector is the one that was originally submitted by the 549 * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical 550 * start sector may be different. Remap protection information to match the 551 * physical LBA on writes, and back to the original seed on reads. 552 * 553 * Type 0 and 3 do not have a ref tag, so no remapping required. 554 */ 555 static void nvme_dif_remap(struct request *req, 556 void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 557 { 558 struct nvme_ns *ns = req->rq_disk->private_data; 559 struct bio_integrity_payload *bip; 560 struct t10_pi_tuple *pi; 561 void *p, *pmap; 562 u32 i, nlb, ts, phys, virt; 563 564 if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) 565 return; 566 567 bip = bio_integrity(req->bio); 568 if (!bip) 569 return; 570 571 pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; 572 573 p = pmap; 574 virt = bip_get_seed(bip); 575 phys = nvme_block_nr(ns, blk_rq_pos(req)); 576 nlb = (blk_rq_bytes(req) >> ns->lba_shift); 577 ts = ns->disk->queue->integrity.tuple_size; 578 579 for (i = 0; i < nlb; i++, virt++, phys++) { 580 pi = (struct t10_pi_tuple *)p; 581 dif_swap(phys, virt, pi); 582 p += ts; 583 } 584 kunmap_atomic(pmap); 585 } 586 #else /* CONFIG_BLK_DEV_INTEGRITY */ 587 static void nvme_dif_remap(struct request *req, 588 void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 589 { 590 } 591 static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 592 { 593 } 594 static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 595 { 596 } 597 #endif 598 599 static void nvme_print_sgl(struct scatterlist *sgl, int nents) 600 { 601 int i; 602 struct scatterlist *sg; 603 604 for_each_sg(sgl, sg, nents, i) { 605 dma_addr_t phys = sg_phys(sg); 606 pr_warn("sg[%d] phys_addr:%pad offset:%d length:%d " 607 "dma_address:%pad dma_length:%d\n", 608 i, &phys, sg->offset, sg->length, &sg_dma_address(sg), 609 sg_dma_len(sg)); 610 } 611 } 612 613 static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, 614 struct request *req, struct nvme_rw_command *cmnd) 615 { 616 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 617 struct dma_pool *pool; 618 int length = blk_rq_payload_bytes(req); 619 struct scatterlist *sg = iod->sg; 620 int dma_len = sg_dma_len(sg); 621 u64 dma_addr = sg_dma_address(sg); 622 u32 page_size = dev->ctrl.page_size; 623 int offset = dma_addr & (page_size - 1); 624 __le64 *prp_list; 625 void **list = nvme_pci_iod_list(req); 626 dma_addr_t prp_dma; 627 int nprps, i; 628 629 length -= (page_size - offset); 630 if (length <= 0) { 631 iod->first_dma = 0; 632 goto done; 633 } 634 635 dma_len -= (page_size - offset); 636 if (dma_len) { 637 dma_addr += (page_size - offset); 638 } else { 639 sg = sg_next(sg); 640 dma_addr = sg_dma_address(sg); 641 dma_len = sg_dma_len(sg); 642 } 643 644 if (length <= page_size) { 645 iod->first_dma = dma_addr; 646 goto done; 647 } 648 649 nprps = DIV_ROUND_UP(length, page_size); 650 if (nprps <= (256 / 8)) { 651 pool = dev->prp_small_pool; 652 iod->npages = 0; 653 } else { 654 pool = dev->prp_page_pool; 655 iod->npages = 1; 656 } 657 658 prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 659 if (!prp_list) { 660 iod->first_dma = dma_addr; 661 iod->npages = -1; 662 return BLK_STS_RESOURCE; 663 } 664 list[0] = prp_list; 665 iod->first_dma = prp_dma; 666 i = 0; 667 for (;;) { 668 if (i == page_size >> 3) { 669 __le64 *old_prp_list = prp_list; 670 prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 671 if (!prp_list) 672 return BLK_STS_RESOURCE; 673 list[iod->npages++] = prp_list; 674 prp_list[0] = old_prp_list[i - 1]; 675 old_prp_list[i - 1] = cpu_to_le64(prp_dma); 676 i = 1; 677 } 678 prp_list[i++] = cpu_to_le64(dma_addr); 679 dma_len -= page_size; 680 dma_addr += page_size; 681 length -= page_size; 682 if (length <= 0) 683 break; 684 if (dma_len > 0) 685 continue; 686 if (unlikely(dma_len < 0)) 687 goto bad_sgl; 688 sg = sg_next(sg); 689 dma_addr = sg_dma_address(sg); 690 dma_len = sg_dma_len(sg); 691 } 692 693 done: 694 cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); 695 cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma); 696 697 return BLK_STS_OK; 698 699 bad_sgl: 700 WARN(DO_ONCE(nvme_print_sgl, iod->sg, iod->nents), 701 "Invalid SGL for payload:%d nents:%d\n", 702 blk_rq_payload_bytes(req), iod->nents); 703 return BLK_STS_IOERR; 704 } 705 706 static void nvme_pci_sgl_set_data(struct nvme_sgl_desc *sge, 707 struct scatterlist *sg) 708 { 709 sge->addr = cpu_to_le64(sg_dma_address(sg)); 710 sge->length = cpu_to_le32(sg_dma_len(sg)); 711 sge->type = NVME_SGL_FMT_DATA_DESC << 4; 712 } 713 714 static void nvme_pci_sgl_set_seg(struct nvme_sgl_desc *sge, 715 dma_addr_t dma_addr, int entries) 716 { 717 sge->addr = cpu_to_le64(dma_addr); 718 if (entries < SGES_PER_PAGE) { 719 sge->length = cpu_to_le32(entries * sizeof(*sge)); 720 sge->type = NVME_SGL_FMT_LAST_SEG_DESC << 4; 721 } else { 722 sge->length = cpu_to_le32(PAGE_SIZE); 723 sge->type = NVME_SGL_FMT_SEG_DESC << 4; 724 } 725 } 726 727 static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, 728 struct request *req, struct nvme_rw_command *cmd, int entries) 729 { 730 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 731 struct dma_pool *pool; 732 struct nvme_sgl_desc *sg_list; 733 struct scatterlist *sg = iod->sg; 734 dma_addr_t sgl_dma; 735 int i = 0; 736 737 /* setting the transfer type as SGL */ 738 cmd->flags = NVME_CMD_SGL_METABUF; 739 740 if (entries == 1) { 741 nvme_pci_sgl_set_data(&cmd->dptr.sgl, sg); 742 return BLK_STS_OK; 743 } 744 745 if (entries <= (256 / sizeof(struct nvme_sgl_desc))) { 746 pool = dev->prp_small_pool; 747 iod->npages = 0; 748 } else { 749 pool = dev->prp_page_pool; 750 iod->npages = 1; 751 } 752 753 sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); 754 if (!sg_list) { 755 iod->npages = -1; 756 return BLK_STS_RESOURCE; 757 } 758 759 nvme_pci_iod_list(req)[0] = sg_list; 760 iod->first_dma = sgl_dma; 761 762 nvme_pci_sgl_set_seg(&cmd->dptr.sgl, sgl_dma, entries); 763 764 do { 765 if (i == SGES_PER_PAGE) { 766 struct nvme_sgl_desc *old_sg_desc = sg_list; 767 struct nvme_sgl_desc *link = &old_sg_desc[i - 1]; 768 769 sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); 770 if (!sg_list) 771 return BLK_STS_RESOURCE; 772 773 i = 0; 774 nvme_pci_iod_list(req)[iod->npages++] = sg_list; 775 sg_list[i++] = *link; 776 nvme_pci_sgl_set_seg(link, sgl_dma, entries); 777 } 778 779 nvme_pci_sgl_set_data(&sg_list[i++], sg); 780 sg = sg_next(sg); 781 } while (--entries > 0); 782 783 return BLK_STS_OK; 784 } 785 786 static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, 787 struct nvme_command *cmnd) 788 { 789 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 790 struct request_queue *q = req->q; 791 enum dma_data_direction dma_dir = rq_data_dir(req) ? 792 DMA_TO_DEVICE : DMA_FROM_DEVICE; 793 blk_status_t ret = BLK_STS_IOERR; 794 int nr_mapped; 795 796 sg_init_table(iod->sg, blk_rq_nr_phys_segments(req)); 797 iod->nents = blk_rq_map_sg(q, req, iod->sg); 798 if (!iod->nents) 799 goto out; 800 801 ret = BLK_STS_RESOURCE; 802 nr_mapped = dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir, 803 DMA_ATTR_NO_WARN); 804 if (!nr_mapped) 805 goto out; 806 807 if (iod->use_sgl) 808 ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw, nr_mapped); 809 else 810 ret = nvme_pci_setup_prps(dev, req, &cmnd->rw); 811 812 if (ret != BLK_STS_OK) 813 goto out_unmap; 814 815 ret = BLK_STS_IOERR; 816 if (blk_integrity_rq(req)) { 817 if (blk_rq_count_integrity_sg(q, req->bio) != 1) 818 goto out_unmap; 819 820 sg_init_table(&iod->meta_sg, 1); 821 if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1) 822 goto out_unmap; 823 824 if (req_op(req) == REQ_OP_WRITE) 825 nvme_dif_remap(req, nvme_dif_prep); 826 827 if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir)) 828 goto out_unmap; 829 } 830 831 if (blk_integrity_rq(req)) 832 cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); 833 return BLK_STS_OK; 834 835 out_unmap: 836 dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 837 out: 838 return ret; 839 } 840 841 static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) 842 { 843 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 844 enum dma_data_direction dma_dir = rq_data_dir(req) ? 845 DMA_TO_DEVICE : DMA_FROM_DEVICE; 846 847 if (iod->nents) { 848 dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 849 if (blk_integrity_rq(req)) { 850 if (req_op(req) == REQ_OP_READ) 851 nvme_dif_remap(req, nvme_dif_complete); 852 dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); 853 } 854 } 855 856 nvme_cleanup_cmd(req); 857 nvme_free_iod(dev, req); 858 } 859 860 /* 861 * NOTE: ns is NULL when called on the admin queue. 862 */ 863 static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 864 const struct blk_mq_queue_data *bd) 865 { 866 struct nvme_ns *ns = hctx->queue->queuedata; 867 struct nvme_queue *nvmeq = hctx->driver_data; 868 struct nvme_dev *dev = nvmeq->dev; 869 struct request *req = bd->rq; 870 struct nvme_command cmnd; 871 blk_status_t ret; 872 873 ret = nvme_setup_cmd(ns, req, &cmnd); 874 if (ret) 875 return ret; 876 877 ret = nvme_init_iod(req, dev); 878 if (ret) 879 goto out_free_cmd; 880 881 if (blk_rq_nr_phys_segments(req)) { 882 ret = nvme_map_data(dev, req, &cmnd); 883 if (ret) 884 goto out_cleanup_iod; 885 } 886 887 blk_mq_start_request(req); 888 889 spin_lock_irq(&nvmeq->q_lock); 890 if (unlikely(nvmeq->cq_vector < 0)) { 891 ret = BLK_STS_IOERR; 892 spin_unlock_irq(&nvmeq->q_lock); 893 goto out_cleanup_iod; 894 } 895 __nvme_submit_cmd(nvmeq, &cmnd); 896 nvme_process_cq(nvmeq); 897 spin_unlock_irq(&nvmeq->q_lock); 898 return BLK_STS_OK; 899 out_cleanup_iod: 900 nvme_free_iod(dev, req); 901 out_free_cmd: 902 nvme_cleanup_cmd(req); 903 return ret; 904 } 905 906 static void nvme_pci_complete_rq(struct request *req) 907 { 908 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 909 910 nvme_unmap_data(iod->nvmeq->dev, req); 911 nvme_complete_rq(req); 912 } 913 914 /* We read the CQE phase first to check if the rest of the entry is valid */ 915 static inline bool nvme_cqe_valid(struct nvme_queue *nvmeq, u16 head, 916 u16 phase) 917 { 918 return (le16_to_cpu(nvmeq->cqes[head].status) & 1) == phase; 919 } 920 921 static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq) 922 { 923 u16 head = nvmeq->cq_head; 924 925 if (likely(nvmeq->cq_vector >= 0)) { 926 if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db, 927 nvmeq->dbbuf_cq_ei)) 928 writel(head, nvmeq->q_db + nvmeq->dev->db_stride); 929 } 930 } 931 932 static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, 933 struct nvme_completion *cqe) 934 { 935 struct request *req; 936 937 if (unlikely(cqe->command_id >= nvmeq->q_depth)) { 938 dev_warn(nvmeq->dev->ctrl.device, 939 "invalid id %d completed on queue %d\n", 940 cqe->command_id, le16_to_cpu(cqe->sq_id)); 941 return; 942 } 943 944 /* 945 * AEN requests are special as they don't time out and can 946 * survive any kind of queue freeze and often don't respond to 947 * aborts. We don't even bother to allocate a struct request 948 * for them but rather special case them here. 949 */ 950 if (unlikely(nvmeq->qid == 0 && 951 cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { 952 nvme_complete_async_event(&nvmeq->dev->ctrl, 953 cqe->status, &cqe->result); 954 return; 955 } 956 957 nvmeq->cqe_seen = 1; 958 req = blk_mq_tag_to_rq(*nvmeq->tags, cqe->command_id); 959 nvme_end_request(req, cqe->status, cqe->result); 960 } 961 962 static inline bool nvme_read_cqe(struct nvme_queue *nvmeq, 963 struct nvme_completion *cqe) 964 { 965 if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) { 966 *cqe = nvmeq->cqes[nvmeq->cq_head]; 967 968 if (++nvmeq->cq_head == nvmeq->q_depth) { 969 nvmeq->cq_head = 0; 970 nvmeq->cq_phase = !nvmeq->cq_phase; 971 } 972 return true; 973 } 974 return false; 975 } 976 977 static void nvme_process_cq(struct nvme_queue *nvmeq) 978 { 979 struct nvme_completion cqe; 980 int consumed = 0; 981 982 while (nvme_read_cqe(nvmeq, &cqe)) { 983 nvme_handle_cqe(nvmeq, &cqe); 984 consumed++; 985 } 986 987 if (consumed) 988 nvme_ring_cq_doorbell(nvmeq); 989 } 990 991 static irqreturn_t nvme_irq(int irq, void *data) 992 { 993 irqreturn_t result; 994 struct nvme_queue *nvmeq = data; 995 spin_lock(&nvmeq->q_lock); 996 nvme_process_cq(nvmeq); 997 result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; 998 nvmeq->cqe_seen = 0; 999 spin_unlock(&nvmeq->q_lock); 1000 return result; 1001 } 1002 1003 static irqreturn_t nvme_irq_check(int irq, void *data) 1004 { 1005 struct nvme_queue *nvmeq = data; 1006 if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) 1007 return IRQ_WAKE_THREAD; 1008 return IRQ_NONE; 1009 } 1010 1011 static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag) 1012 { 1013 struct nvme_completion cqe; 1014 int found = 0, consumed = 0; 1015 1016 if (!nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) 1017 return 0; 1018 1019 spin_lock_irq(&nvmeq->q_lock); 1020 while (nvme_read_cqe(nvmeq, &cqe)) { 1021 nvme_handle_cqe(nvmeq, &cqe); 1022 consumed++; 1023 1024 if (tag == cqe.command_id) { 1025 found = 1; 1026 break; 1027 } 1028 } 1029 1030 if (consumed) 1031 nvme_ring_cq_doorbell(nvmeq); 1032 spin_unlock_irq(&nvmeq->q_lock); 1033 1034 return found; 1035 } 1036 1037 static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) 1038 { 1039 struct nvme_queue *nvmeq = hctx->driver_data; 1040 1041 return __nvme_poll(nvmeq, tag); 1042 } 1043 1044 static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl) 1045 { 1046 struct nvme_dev *dev = to_nvme_dev(ctrl); 1047 struct nvme_queue *nvmeq = &dev->queues[0]; 1048 struct nvme_command c; 1049 1050 memset(&c, 0, sizeof(c)); 1051 c.common.opcode = nvme_admin_async_event; 1052 c.common.command_id = NVME_AQ_BLK_MQ_DEPTH; 1053 1054 spin_lock_irq(&nvmeq->q_lock); 1055 __nvme_submit_cmd(nvmeq, &c); 1056 spin_unlock_irq(&nvmeq->q_lock); 1057 } 1058 1059 static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) 1060 { 1061 struct nvme_command c; 1062 1063 memset(&c, 0, sizeof(c)); 1064 c.delete_queue.opcode = opcode; 1065 c.delete_queue.qid = cpu_to_le16(id); 1066 1067 return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 1068 } 1069 1070 static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, 1071 struct nvme_queue *nvmeq) 1072 { 1073 struct nvme_command c; 1074 int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; 1075 1076 /* 1077 * Note: we (ab)use the fact that the prp fields survive if no data 1078 * is attached to the request. 1079 */ 1080 memset(&c, 0, sizeof(c)); 1081 c.create_cq.opcode = nvme_admin_create_cq; 1082 c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); 1083 c.create_cq.cqid = cpu_to_le16(qid); 1084 c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 1085 c.create_cq.cq_flags = cpu_to_le16(flags); 1086 c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); 1087 1088 return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 1089 } 1090 1091 static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, 1092 struct nvme_queue *nvmeq) 1093 { 1094 struct nvme_command c; 1095 int flags = NVME_QUEUE_PHYS_CONTIG; 1096 1097 /* 1098 * Note: we (ab)use the fact that the prp fields survive if no data 1099 * is attached to the request. 1100 */ 1101 memset(&c, 0, sizeof(c)); 1102 c.create_sq.opcode = nvme_admin_create_sq; 1103 c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); 1104 c.create_sq.sqid = cpu_to_le16(qid); 1105 c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 1106 c.create_sq.sq_flags = cpu_to_le16(flags); 1107 c.create_sq.cqid = cpu_to_le16(qid); 1108 1109 return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 1110 } 1111 1112 static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) 1113 { 1114 return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); 1115 } 1116 1117 static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) 1118 { 1119 return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); 1120 } 1121 1122 static void abort_endio(struct request *req, blk_status_t error) 1123 { 1124 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 1125 struct nvme_queue *nvmeq = iod->nvmeq; 1126 1127 dev_warn(nvmeq->dev->ctrl.device, 1128 "Abort status: 0x%x", nvme_req(req)->status); 1129 atomic_inc(&nvmeq->dev->ctrl.abort_limit); 1130 blk_mq_free_request(req); 1131 } 1132 1133 static bool nvme_should_reset(struct nvme_dev *dev, u32 csts) 1134 { 1135 1136 /* If true, indicates loss of adapter communication, possibly by a 1137 * NVMe Subsystem reset. 1138 */ 1139 bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO); 1140 1141 /* If there is a reset/reinit ongoing, we shouldn't reset again. */ 1142 switch (dev->ctrl.state) { 1143 case NVME_CTRL_RESETTING: 1144 case NVME_CTRL_CONNECTING: 1145 return false; 1146 default: 1147 break; 1148 } 1149 1150 /* We shouldn't reset unless the controller is on fatal error state 1151 * _or_ if we lost the communication with it. 1152 */ 1153 if (!(csts & NVME_CSTS_CFS) && !nssro) 1154 return false; 1155 1156 return true; 1157 } 1158 1159 static void nvme_warn_reset(struct nvme_dev *dev, u32 csts) 1160 { 1161 /* Read a config register to help see what died. */ 1162 u16 pci_status; 1163 int result; 1164 1165 result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS, 1166 &pci_status); 1167 if (result == PCIBIOS_SUCCESSFUL) 1168 dev_warn(dev->ctrl.device, 1169 "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n", 1170 csts, pci_status); 1171 else 1172 dev_warn(dev->ctrl.device, 1173 "controller is down; will reset: CSTS=0x%x, PCI_STATUS read failed (%d)\n", 1174 csts, result); 1175 } 1176 1177 static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) 1178 { 1179 struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 1180 struct nvme_queue *nvmeq = iod->nvmeq; 1181 struct nvme_dev *dev = nvmeq->dev; 1182 struct request *abort_req; 1183 struct nvme_command cmd; 1184 u32 csts = readl(dev->bar + NVME_REG_CSTS); 1185 1186 /* If PCI error recovery process is happening, we cannot reset or 1187 * the recovery mechanism will surely fail. 1188 */ 1189 mb(); 1190 if (pci_channel_offline(to_pci_dev(dev->dev))) 1191 return BLK_EH_RESET_TIMER; 1192 1193 /* 1194 * Reset immediately if the controller is failed 1195 */ 1196 if (nvme_should_reset(dev, csts)) { 1197 nvme_warn_reset(dev, csts); 1198 nvme_dev_disable(dev, false); 1199 nvme_reset_ctrl(&dev->ctrl); 1200 return BLK_EH_HANDLED; 1201 } 1202 1203 /* 1204 * Did we miss an interrupt? 1205 */ 1206 if (__nvme_poll(nvmeq, req->tag)) { 1207 dev_warn(dev->ctrl.device, 1208 "I/O %d QID %d timeout, completion polled\n", 1209 req->tag, nvmeq->qid); 1210 return BLK_EH_HANDLED; 1211 } 1212 1213 /* 1214 * Shutdown immediately if controller times out while starting. The 1215 * reset work will see the pci device disabled when it gets the forced 1216 * cancellation error. All outstanding requests are completed on 1217 * shutdown, so we return BLK_EH_HANDLED. 1218 */ 1219 switch (dev->ctrl.state) { 1220 case NVME_CTRL_CONNECTING: 1221 case NVME_CTRL_RESETTING: 1222 dev_warn(dev->ctrl.device, 1223 "I/O %d QID %d timeout, disable controller\n", 1224 req->tag, nvmeq->qid); 1225 nvme_dev_disable(dev, false); 1226 nvme_req(req)->flags |= NVME_REQ_CANCELLED; 1227 return BLK_EH_HANDLED; 1228 default: 1229 break; 1230 } 1231 1232 /* 1233 * Shutdown the controller immediately and schedule a reset if the 1234 * command was already aborted once before and still hasn't been 1235 * returned to the driver, or if this is the admin queue. 1236 */ 1237 if (!nvmeq->qid || iod->aborted) { 1238 dev_warn(dev->ctrl.device, 1239 "I/O %d QID %d timeout, reset controller\n", 1240 req->tag, nvmeq->qid); 1241 nvme_dev_disable(dev, false); 1242 nvme_reset_ctrl(&dev->ctrl); 1243 1244 /* 1245 * Mark the request as handled, since the inline shutdown 1246 * forces all outstanding requests to complete. 1247 */ 1248 nvme_req(req)->flags |= NVME_REQ_CANCELLED; 1249 return BLK_EH_HANDLED; 1250 } 1251 1252 if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) { 1253 atomic_inc(&dev->ctrl.abort_limit); 1254 return BLK_EH_RESET_TIMER; 1255 } 1256 iod->aborted = 1; 1257 1258 memset(&cmd, 0, sizeof(cmd)); 1259 cmd.abort.opcode = nvme_admin_abort_cmd; 1260 cmd.abort.cid = req->tag; 1261 cmd.abort.sqid = cpu_to_le16(nvmeq->qid); 1262 1263 dev_warn(nvmeq->dev->ctrl.device, 1264 "I/O %d QID %d timeout, aborting\n", 1265 req->tag, nvmeq->qid); 1266 1267 abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd, 1268 BLK_MQ_REQ_NOWAIT, NVME_QID_ANY); 1269 if (IS_ERR(abort_req)) { 1270 atomic_inc(&dev->ctrl.abort_limit); 1271 return BLK_EH_RESET_TIMER; 1272 } 1273 1274 abort_req->timeout = ADMIN_TIMEOUT; 1275 abort_req->end_io_data = NULL; 1276 blk_execute_rq_nowait(abort_req->q, NULL, abort_req, 0, abort_endio); 1277 1278 /* 1279 * The aborted req will be completed on receiving the abort req. 1280 * We enable the timer again. If hit twice, it'll cause a device reset, 1281 * as the device then is in a faulty state. 1282 */ 1283 return BLK_EH_RESET_TIMER; 1284 } 1285 1286 static void nvme_free_queue(struct nvme_queue *nvmeq) 1287 { 1288 dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), 1289 (void *)nvmeq->cqes, nvmeq->cq_dma_addr); 1290 if (nvmeq->sq_cmds) 1291 dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), 1292 nvmeq->sq_cmds, nvmeq->sq_dma_addr); 1293 } 1294 1295 static void nvme_free_queues(struct nvme_dev *dev, int lowest) 1296 { 1297 int i; 1298 1299 for (i = dev->ctrl.queue_count - 1; i >= lowest; i--) { 1300 dev->ctrl.queue_count--; 1301 nvme_free_queue(&dev->queues[i]); 1302 } 1303 } 1304 1305 /** 1306 * nvme_suspend_queue - put queue into suspended state 1307 * @nvmeq - queue to suspend 1308 */ 1309 static int nvme_suspend_queue(struct nvme_queue *nvmeq) 1310 { 1311 int vector; 1312 1313 spin_lock_irq(&nvmeq->q_lock); 1314 if (nvmeq->cq_vector == -1) { 1315 spin_unlock_irq(&nvmeq->q_lock); 1316 return 1; 1317 } 1318 vector = nvmeq->cq_vector; 1319 nvmeq->dev->online_queues--; 1320 nvmeq->cq_vector = -1; 1321 spin_unlock_irq(&nvmeq->q_lock); 1322 1323 if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) 1324 blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q); 1325 1326 pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq); 1327 1328 return 0; 1329 } 1330 1331 static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown) 1332 { 1333 struct nvme_queue *nvmeq = &dev->queues[0]; 1334 1335 if (shutdown) 1336 nvme_shutdown_ctrl(&dev->ctrl); 1337 else 1338 nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap); 1339 1340 spin_lock_irq(&nvmeq->q_lock); 1341 nvme_process_cq(nvmeq); 1342 spin_unlock_irq(&nvmeq->q_lock); 1343 } 1344 1345 static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, 1346 int entry_size) 1347 { 1348 int q_depth = dev->q_depth; 1349 unsigned q_size_aligned = roundup(q_depth * entry_size, 1350 dev->ctrl.page_size); 1351 1352 if (q_size_aligned * nr_io_queues > dev->cmb_size) { 1353 u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); 1354 mem_per_q = round_down(mem_per_q, dev->ctrl.page_size); 1355 q_depth = div_u64(mem_per_q, entry_size); 1356 1357 /* 1358 * Ensure the reduced q_depth is above some threshold where it 1359 * would be better to map queues in system memory with the 1360 * original depth 1361 */ 1362 if (q_depth < 64) 1363 return -ENOMEM; 1364 } 1365 1366 return q_depth; 1367 } 1368 1369 static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, 1370 int qid, int depth) 1371 { 1372 /* CMB SQEs will be mapped before creation */ 1373 if (qid && dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) 1374 return 0; 1375 1376 nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), 1377 &nvmeq->sq_dma_addr, GFP_KERNEL); 1378 if (!nvmeq->sq_cmds) 1379 return -ENOMEM; 1380 return 0; 1381 } 1382 1383 static int nvme_alloc_queue(struct nvme_dev *dev, int qid, 1384 int depth, int node) 1385 { 1386 struct nvme_queue *nvmeq = &dev->queues[qid]; 1387 1388 if (dev->ctrl.queue_count > qid) 1389 return 0; 1390 1391 nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), 1392 &nvmeq->cq_dma_addr, GFP_KERNEL); 1393 if (!nvmeq->cqes) 1394 goto free_nvmeq; 1395 1396 if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) 1397 goto free_cqdma; 1398 1399 nvmeq->q_dmadev = dev->dev; 1400 nvmeq->dev = dev; 1401 spin_lock_init(&nvmeq->q_lock); 1402 nvmeq->cq_head = 0; 1403 nvmeq->cq_phase = 1; 1404 nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 1405 nvmeq->q_depth = depth; 1406 nvmeq->qid = qid; 1407 nvmeq->cq_vector = -1; 1408 dev->ctrl.queue_count++; 1409 1410 return 0; 1411 1412 free_cqdma: 1413 dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, 1414 nvmeq->cq_dma_addr); 1415 free_nvmeq: 1416 return -ENOMEM; 1417 } 1418 1419 static int queue_request_irq(struct nvme_queue *nvmeq) 1420 { 1421 struct pci_dev *pdev = to_pci_dev(nvmeq->dev->dev); 1422 int nr = nvmeq->dev->ctrl.instance; 1423 1424 if (use_threaded_interrupts) { 1425 return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq_check, 1426 nvme_irq, nvmeq, "nvme%dq%d", nr, nvmeq->qid); 1427 } else { 1428 return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq, 1429 NULL, nvmeq, "nvme%dq%d", nr, nvmeq->qid); 1430 } 1431 } 1432 1433 static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) 1434 { 1435 struct nvme_dev *dev = nvmeq->dev; 1436 1437 spin_lock_irq(&nvmeq->q_lock); 1438 nvmeq->sq_tail = 0; 1439 nvmeq->cq_head = 0; 1440 nvmeq->cq_phase = 1; 1441 nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 1442 memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); 1443 nvme_dbbuf_init(dev, nvmeq, qid); 1444 dev->online_queues++; 1445 spin_unlock_irq(&nvmeq->q_lock); 1446 } 1447 1448 static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) 1449 { 1450 struct nvme_dev *dev = nvmeq->dev; 1451 int result; 1452 1453 if (dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) { 1454 unsigned offset = (qid - 1) * roundup(SQ_SIZE(nvmeq->q_depth), 1455 dev->ctrl.page_size); 1456 nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset; 1457 nvmeq->sq_cmds_io = dev->cmb + offset; 1458 } 1459 1460 nvmeq->cq_vector = qid - 1; 1461 result = adapter_alloc_cq(dev, qid, nvmeq); 1462 if (result < 0) 1463 goto release_vector; 1464 1465 result = adapter_alloc_sq(dev, qid, nvmeq); 1466 if (result < 0) 1467 goto release_cq; 1468 1469 nvme_init_queue(nvmeq, qid); 1470 result = queue_request_irq(nvmeq); 1471 if (result < 0) 1472 goto release_sq; 1473 1474 return result; 1475 1476 release_sq: 1477 dev->online_queues--; 1478 adapter_delete_sq(dev, qid); 1479 release_cq: 1480 adapter_delete_cq(dev, qid); 1481 release_vector: 1482 nvmeq->cq_vector = -1; 1483 return result; 1484 } 1485 1486 static const struct blk_mq_ops nvme_mq_admin_ops = { 1487 .queue_rq = nvme_queue_rq, 1488 .complete = nvme_pci_complete_rq, 1489 .init_hctx = nvme_admin_init_hctx, 1490 .exit_hctx = nvme_admin_exit_hctx, 1491 .init_request = nvme_init_request, 1492 .timeout = nvme_timeout, 1493 }; 1494 1495 static const struct blk_mq_ops nvme_mq_ops = { 1496 .queue_rq = nvme_queue_rq, 1497 .complete = nvme_pci_complete_rq, 1498 .init_hctx = nvme_init_hctx, 1499 .init_request = nvme_init_request, 1500 .map_queues = nvme_pci_map_queues, 1501 .timeout = nvme_timeout, 1502 .poll = nvme_poll, 1503 }; 1504 1505 static void nvme_dev_remove_admin(struct nvme_dev *dev) 1506 { 1507 if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) { 1508 /* 1509 * If the controller was reset during removal, it's possible 1510 * user requests may be waiting on a stopped queue. Start the 1511 * queue to flush these to completion. 1512 */ 1513 blk_mq_unquiesce_queue(dev->ctrl.admin_q); 1514 blk_cleanup_queue(dev->ctrl.admin_q); 1515 blk_mq_free_tag_set(&dev->admin_tagset); 1516 } 1517 } 1518 1519 static int nvme_alloc_admin_tags(struct nvme_dev *dev) 1520 { 1521 if (!dev->ctrl.admin_q) { 1522 dev->admin_tagset.ops = &nvme_mq_admin_ops; 1523 dev->admin_tagset.nr_hw_queues = 1; 1524 1525 dev->admin_tagset.queue_depth = NVME_AQ_MQ_TAG_DEPTH; 1526 dev->admin_tagset.timeout = ADMIN_TIMEOUT; 1527 dev->admin_tagset.numa_node = dev_to_node(dev->dev); 1528 dev->admin_tagset.cmd_size = nvme_pci_cmd_size(dev, false); 1529 dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; 1530 dev->admin_tagset.driver_data = dev; 1531 1532 if (blk_mq_alloc_tag_set(&dev->admin_tagset)) 1533 return -ENOMEM; 1534 dev->ctrl.admin_tagset = &dev->admin_tagset; 1535 1536 dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); 1537 if (IS_ERR(dev->ctrl.admin_q)) { 1538 blk_mq_free_tag_set(&dev->admin_tagset); 1539 return -ENOMEM; 1540 } 1541 if (!blk_get_queue(dev->ctrl.admin_q)) { 1542 nvme_dev_remove_admin(dev); 1543 dev->ctrl.admin_q = NULL; 1544 return -ENODEV; 1545 } 1546 } else 1547 blk_mq_unquiesce_queue(dev->ctrl.admin_q); 1548 1549 return 0; 1550 } 1551 1552 static unsigned long db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) 1553 { 1554 return NVME_REG_DBS + ((nr_io_queues + 1) * 8 * dev->db_stride); 1555 } 1556 1557 static int nvme_remap_bar(struct nvme_dev *dev, unsigned long size) 1558 { 1559 struct pci_dev *pdev = to_pci_dev(dev->dev); 1560 1561 if (size <= dev->bar_mapped_size) 1562 return 0; 1563 if (size > pci_resource_len(pdev, 0)) 1564 return -ENOMEM; 1565 if (dev->bar) 1566 iounmap(dev->bar); 1567 dev->bar = ioremap(pci_resource_start(pdev, 0), size); 1568 if (!dev->bar) { 1569 dev->bar_mapped_size = 0; 1570 return -ENOMEM; 1571 } 1572 dev->bar_mapped_size = size; 1573 dev->dbs = dev->bar + NVME_REG_DBS; 1574 1575 return 0; 1576 } 1577 1578 static int nvme_pci_configure_admin_queue(struct nvme_dev *dev) 1579 { 1580 int result; 1581 u32 aqa; 1582 struct nvme_queue *nvmeq; 1583 1584 result = nvme_remap_bar(dev, db_bar_size(dev, 0)); 1585 if (result < 0) 1586 return result; 1587 1588 dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1, 0) ? 1589 NVME_CAP_NSSRC(dev->ctrl.cap) : 0; 1590 1591 if (dev->subsystem && 1592 (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO)) 1593 writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS); 1594 1595 result = nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap); 1596 if (result < 0) 1597 return result; 1598 1599 result = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH, 1600 dev_to_node(dev->dev)); 1601 if (result) 1602 return result; 1603 1604 nvmeq = &dev->queues[0]; 1605 aqa = nvmeq->q_depth - 1; 1606 aqa |= aqa << 16; 1607 1608 writel(aqa, dev->bar + NVME_REG_AQA); 1609 lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ); 1610 lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ); 1611 1612 result = nvme_enable_ctrl(&dev->ctrl, dev->ctrl.cap); 1613 if (result) 1614 return result; 1615 1616 nvmeq->cq_vector = 0; 1617 nvme_init_queue(nvmeq, 0); 1618 result = queue_request_irq(nvmeq); 1619 if (result) { 1620 nvmeq->cq_vector = -1; 1621 return result; 1622 } 1623 1624 return result; 1625 } 1626 1627 static int nvme_create_io_queues(struct nvme_dev *dev) 1628 { 1629 unsigned i, max; 1630 int ret = 0; 1631 1632 for (i = dev->ctrl.queue_count; i <= dev->max_qid; i++) { 1633 /* vector == qid - 1, match nvme_create_queue */ 1634 if (nvme_alloc_queue(dev, i, dev->q_depth, 1635 pci_irq_get_node(to_pci_dev(dev->dev), i - 1))) { 1636 ret = -ENOMEM; 1637 break; 1638 } 1639 } 1640 1641 max = min(dev->max_qid, dev->ctrl.queue_count - 1); 1642 for (i = dev->online_queues; i <= max; i++) { 1643 ret = nvme_create_queue(&dev->queues[i], i); 1644 if (ret) 1645 break; 1646 } 1647 1648 /* 1649 * Ignore failing Create SQ/CQ commands, we can continue with less 1650 * than the desired amount of queues, and even a controller without 1651 * I/O queues can still be used to issue admin commands. This might 1652 * be useful to upgrade a buggy firmware for example. 1653 */ 1654 return ret >= 0 ? 0 : ret; 1655 } 1656 1657 static ssize_t nvme_cmb_show(struct device *dev, 1658 struct device_attribute *attr, 1659 char *buf) 1660 { 1661 struct nvme_dev *ndev = to_nvme_dev(dev_get_drvdata(dev)); 1662 1663 return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz : x%08x\n", 1664 ndev->cmbloc, ndev->cmbsz); 1665 } 1666 static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL); 1667 1668 static u64 nvme_cmb_size_unit(struct nvme_dev *dev) 1669 { 1670 u8 szu = (dev->cmbsz >> NVME_CMBSZ_SZU_SHIFT) & NVME_CMBSZ_SZU_MASK; 1671 1672 return 1ULL << (12 + 4 * szu); 1673 } 1674 1675 static u32 nvme_cmb_size(struct nvme_dev *dev) 1676 { 1677 return (dev->cmbsz >> NVME_CMBSZ_SZ_SHIFT) & NVME_CMBSZ_SZ_MASK; 1678 } 1679 1680 static void nvme_map_cmb(struct nvme_dev *dev) 1681 { 1682 u64 size, offset; 1683 resource_size_t bar_size; 1684 struct pci_dev *pdev = to_pci_dev(dev->dev); 1685 int bar; 1686 1687 dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); 1688 if (!dev->cmbsz) 1689 return; 1690 dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC); 1691 1692 if (!use_cmb_sqes) 1693 return; 1694 1695 size = nvme_cmb_size_unit(dev) * nvme_cmb_size(dev); 1696 offset = nvme_cmb_size_unit(dev) * NVME_CMB_OFST(dev->cmbloc); 1697 bar = NVME_CMB_BIR(dev->cmbloc); 1698 bar_size = pci_resource_len(pdev, bar); 1699 1700 if (offset > bar_size) 1701 return; 1702 1703 /* 1704 * Controllers may support a CMB size larger than their BAR, 1705 * for example, due to being behind a bridge. Reduce the CMB to 1706 * the reported size of the BAR 1707 */ 1708 if (size > bar_size - offset) 1709 size = bar_size - offset; 1710 1711 dev->cmb = ioremap_wc(pci_resource_start(pdev, bar) + offset, size); 1712 if (!dev->cmb) 1713 return; 1714 dev->cmb_bus_addr = pci_bus_address(pdev, bar) + offset; 1715 dev->cmb_size = size; 1716 1717 if (sysfs_add_file_to_group(&dev->ctrl.device->kobj, 1718 &dev_attr_cmb.attr, NULL)) 1719 dev_warn(dev->ctrl.device, 1720 "failed to add sysfs attribute for CMB\n"); 1721 } 1722 1723 static inline void nvme_release_cmb(struct nvme_dev *dev) 1724 { 1725 if (dev->cmb) { 1726 iounmap(dev->cmb); 1727 dev->cmb = NULL; 1728 sysfs_remove_file_from_group(&dev->ctrl.device->kobj, 1729 &dev_attr_cmb.attr, NULL); 1730 dev->cmbsz = 0; 1731 } 1732 } 1733 1734 static int nvme_set_host_mem(struct nvme_dev *dev, u32 bits) 1735 { 1736 u64 dma_addr = dev->host_mem_descs_dma; 1737 struct nvme_command c; 1738 int ret; 1739 1740 memset(&c, 0, sizeof(c)); 1741 c.features.opcode = nvme_admin_set_features; 1742 c.features.fid = cpu_to_le32(NVME_FEAT_HOST_MEM_BUF); 1743 c.features.dword11 = cpu_to_le32(bits); 1744 c.features.dword12 = cpu_to_le32(dev->host_mem_size >> 1745 ilog2(dev->ctrl.page_size)); 1746 c.features.dword13 = cpu_to_le32(lower_32_bits(dma_addr)); 1747 c.features.dword14 = cpu_to_le32(upper_32_bits(dma_addr)); 1748 c.features.dword15 = cpu_to_le32(dev->nr_host_mem_descs); 1749 1750 ret = nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 1751 if (ret) { 1752 dev_warn(dev->ctrl.device, 1753 "failed to set host mem (err %d, flags %#x).\n", 1754 ret, bits); 1755 } 1756 return ret; 1757 } 1758 1759 static void nvme_free_host_mem(struct nvme_dev *dev) 1760 { 1761 int i; 1762 1763 for (i = 0; i < dev->nr_host_mem_descs; i++) { 1764 struct nvme_host_mem_buf_desc *desc = &dev->host_mem_descs[i]; 1765 size_t size = le32_to_cpu(desc->size) * dev->ctrl.page_size; 1766 1767 dma_free_coherent(dev->dev, size, dev->host_mem_desc_bufs[i], 1768 le64_to_cpu(desc->addr)); 1769 } 1770 1771 kfree(dev->host_mem_desc_bufs); 1772 dev->host_mem_desc_bufs = NULL; 1773 dma_free_coherent(dev->dev, 1774 dev->nr_host_mem_descs * sizeof(*dev->host_mem_descs), 1775 dev->host_mem_descs, dev->host_mem_descs_dma); 1776 dev->host_mem_descs = NULL; 1777 dev->nr_host_mem_descs = 0; 1778 } 1779 1780 static int __nvme_alloc_host_mem(struct nvme_dev *dev, u64 preferred, 1781 u32 chunk_size) 1782 { 1783 struct nvme_host_mem_buf_desc *descs; 1784 u32 max_entries, len; 1785 dma_addr_t descs_dma; 1786 int i = 0; 1787 void **bufs; 1788 u64 size, tmp; 1789 1790 tmp = (preferred + chunk_size - 1); 1791 do_div(tmp, chunk_size); 1792 max_entries = tmp; 1793 1794 if (dev->ctrl.hmmaxd && dev->ctrl.hmmaxd < max_entries) 1795 max_entries = dev->ctrl.hmmaxd; 1796 1797 descs = dma_zalloc_coherent(dev->dev, max_entries * sizeof(*descs), 1798 &descs_dma, GFP_KERNEL); 1799 if (!descs) 1800 goto out; 1801 1802 bufs = kcalloc(max_entries, sizeof(*bufs), GFP_KERNEL); 1803 if (!bufs) 1804 goto out_free_descs; 1805 1806 for (size = 0; size < preferred && i < max_entries; size += len) { 1807 dma_addr_t dma_addr; 1808 1809 len = min_t(u64, chunk_size, preferred - size); 1810 bufs[i] = dma_alloc_attrs(dev->dev, len, &dma_addr, GFP_KERNEL, 1811 DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN); 1812 if (!bufs[i]) 1813 break; 1814 1815 descs[i].addr = cpu_to_le64(dma_addr); 1816 descs[i].size = cpu_to_le32(len / dev->ctrl.page_size); 1817 i++; 1818 } 1819 1820 if (!size) 1821 goto out_free_bufs; 1822 1823 dev->nr_host_mem_descs = i; 1824 dev->host_mem_size = size; 1825 dev->host_mem_descs = descs; 1826 dev->host_mem_descs_dma = descs_dma; 1827 dev->host_mem_desc_bufs = bufs; 1828 return 0; 1829 1830 out_free_bufs: 1831 while (--i >= 0) { 1832 size_t size = le32_to_cpu(descs[i].size) * dev->ctrl.page_size; 1833 1834 dma_free_coherent(dev->dev, size, bufs[i], 1835 le64_to_cpu(descs[i].addr)); 1836 } 1837 1838 kfree(bufs); 1839 out_free_descs: 1840 dma_free_coherent(dev->dev, max_entries * sizeof(*descs), descs, 1841 descs_dma); 1842 out: 1843 dev->host_mem_descs = NULL; 1844 return -ENOMEM; 1845 } 1846 1847 static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred) 1848 { 1849 u32 chunk_size; 1850 1851 /* start big and work our way down */ 1852 for (chunk_size = min_t(u64, preferred, PAGE_SIZE * MAX_ORDER_NR_PAGES); 1853 chunk_size >= max_t(u32, dev->ctrl.hmminds * 4096, PAGE_SIZE * 2); 1854 chunk_size /= 2) { 1855 if (!__nvme_alloc_host_mem(dev, preferred, chunk_size)) { 1856 if (!min || dev->host_mem_size >= min) 1857 return 0; 1858 nvme_free_host_mem(dev); 1859 } 1860 } 1861 1862 return -ENOMEM; 1863 } 1864 1865 static int nvme_setup_host_mem(struct nvme_dev *dev) 1866 { 1867 u64 max = (u64)max_host_mem_size_mb * SZ_1M; 1868 u64 preferred = (u64)dev->ctrl.hmpre * 4096; 1869 u64 min = (u64)dev->ctrl.hmmin * 4096; 1870 u32 enable_bits = NVME_HOST_MEM_ENABLE; 1871 int ret; 1872 1873 preferred = min(preferred, max); 1874 if (min > max) { 1875 dev_warn(dev->ctrl.device, 1876 "min host memory (%lld MiB) above limit (%d MiB).\n", 1877 min >> ilog2(SZ_1M), max_host_mem_size_mb); 1878 nvme_free_host_mem(dev); 1879 return 0; 1880 } 1881 1882 /* 1883 * If we already have a buffer allocated check if we can reuse it. 1884 */ 1885 if (dev->host_mem_descs) { 1886 if (dev->host_mem_size >= min) 1887 enable_bits |= NVME_HOST_MEM_RETURN; 1888 else 1889 nvme_free_host_mem(dev); 1890 } 1891 1892 if (!dev->host_mem_descs) { 1893 if (nvme_alloc_host_mem(dev, min, preferred)) { 1894 dev_warn(dev->ctrl.device, 1895 "failed to allocate host memory buffer.\n"); 1896 return 0; /* controller must work without HMB */ 1897 } 1898 1899 dev_info(dev->ctrl.device, 1900 "allocated %lld MiB host memory buffer.\n", 1901 dev->host_mem_size >> ilog2(SZ_1M)); 1902 } 1903 1904 ret = nvme_set_host_mem(dev, enable_bits); 1905 if (ret) 1906 nvme_free_host_mem(dev); 1907 return ret; 1908 } 1909 1910 static int nvme_setup_io_queues(struct nvme_dev *dev) 1911 { 1912 struct nvme_queue *adminq = &dev->queues[0]; 1913 struct pci_dev *pdev = to_pci_dev(dev->dev); 1914 int result, nr_io_queues; 1915 unsigned long size; 1916 1917 nr_io_queues = num_possible_cpus(); 1918 result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues); 1919 if (result < 0) 1920 return result; 1921 1922 if (nr_io_queues == 0) 1923 return 0; 1924 1925 if (dev->cmb && (dev->cmbsz & NVME_CMBSZ_SQS)) { 1926 result = nvme_cmb_qdepth(dev, nr_io_queues, 1927 sizeof(struct nvme_command)); 1928 if (result > 0) 1929 dev->q_depth = result; 1930 else 1931 nvme_release_cmb(dev); 1932 } 1933 1934 do { 1935 size = db_bar_size(dev, nr_io_queues); 1936 result = nvme_remap_bar(dev, size); 1937 if (!result) 1938 break; 1939 if (!--nr_io_queues) 1940 return -ENOMEM; 1941 } while (1); 1942 adminq->q_db = dev->dbs; 1943 1944 /* Deregister the admin queue's interrupt */ 1945 pci_free_irq(pdev, 0, adminq); 1946 1947 /* 1948 * If we enable msix early due to not intx, disable it again before 1949 * setting up the full range we need. 1950 */ 1951 pci_free_irq_vectors(pdev); 1952 nr_io_queues = pci_alloc_irq_vectors(pdev, 1, nr_io_queues, 1953 PCI_IRQ_ALL_TYPES | PCI_IRQ_AFFINITY); 1954 if (nr_io_queues <= 0) 1955 return -EIO; 1956 dev->max_qid = nr_io_queues; 1957 1958 /* 1959 * Should investigate if there's a performance win from allocating 1960 * more queues than interrupt vectors; it might allow the submission 1961 * path to scale better, even if the receive path is limited by the 1962 * number of interrupts. 1963 */ 1964 1965 result = queue_request_irq(adminq); 1966 if (result) { 1967 adminq->cq_vector = -1; 1968 return result; 1969 } 1970 return nvme_create_io_queues(dev); 1971 } 1972 1973 static void nvme_del_queue_end(struct request *req, blk_status_t error) 1974 { 1975 struct nvme_queue *nvmeq = req->end_io_data; 1976 1977 blk_mq_free_request(req); 1978 complete(&nvmeq->dev->ioq_wait); 1979 } 1980 1981 static void nvme_del_cq_end(struct request *req, blk_status_t error) 1982 { 1983 struct nvme_queue *nvmeq = req->end_io_data; 1984 1985 if (!error) { 1986 unsigned long flags; 1987 1988 /* 1989 * We might be called with the AQ q_lock held 1990 * and the I/O queue q_lock should always 1991 * nest inside the AQ one. 1992 */ 1993 spin_lock_irqsave_nested(&nvmeq->q_lock, flags, 1994 SINGLE_DEPTH_NESTING); 1995 nvme_process_cq(nvmeq); 1996 spin_unlock_irqrestore(&nvmeq->q_lock, flags); 1997 } 1998 1999 nvme_del_queue_end(req, error); 2000 } 2001 2002 static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode) 2003 { 2004 struct request_queue *q = nvmeq->dev->ctrl.admin_q; 2005 struct request *req; 2006 struct nvme_command cmd; 2007 2008 memset(&cmd, 0, sizeof(cmd)); 2009 cmd.delete_queue.opcode = opcode; 2010 cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid); 2011 2012 req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY); 2013 if (IS_ERR(req)) 2014 return PTR_ERR(req); 2015 2016 req->timeout = ADMIN_TIMEOUT; 2017 req->end_io_data = nvmeq; 2018 2019 blk_execute_rq_nowait(q, NULL, req, false, 2020 opcode == nvme_admin_delete_cq ? 2021 nvme_del_cq_end : nvme_del_queue_end); 2022 return 0; 2023 } 2024 2025 static void nvme_disable_io_queues(struct nvme_dev *dev) 2026 { 2027 int pass, queues = dev->online_queues - 1; 2028 unsigned long timeout; 2029 u8 opcode = nvme_admin_delete_sq; 2030 2031 for (pass = 0; pass < 2; pass++) { 2032 int sent = 0, i = queues; 2033 2034 reinit_completion(&dev->ioq_wait); 2035 retry: 2036 timeout = ADMIN_TIMEOUT; 2037 for (; i > 0; i--, sent++) 2038 if (nvme_delete_queue(&dev->queues[i], opcode)) 2039 break; 2040 2041 while (sent--) { 2042 timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout); 2043 if (timeout == 0) 2044 return; 2045 if (i) 2046 goto retry; 2047 } 2048 opcode = nvme_admin_delete_cq; 2049 } 2050 } 2051 2052 /* 2053 * return error value only when tagset allocation failed 2054 */ 2055 static int nvme_dev_add(struct nvme_dev *dev) 2056 { 2057 int ret; 2058 2059 if (!dev->ctrl.tagset) { 2060 dev->tagset.ops = &nvme_mq_ops; 2061 dev->tagset.nr_hw_queues = dev->online_queues - 1; 2062 dev->tagset.timeout = NVME_IO_TIMEOUT; 2063 dev->tagset.numa_node = dev_to_node(dev->dev); 2064 dev->tagset.queue_depth = 2065 min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; 2066 dev->tagset.cmd_size = nvme_pci_cmd_size(dev, false); 2067 if ((dev->ctrl.sgls & ((1 << 0) | (1 << 1))) && sgl_threshold) { 2068 dev->tagset.cmd_size = max(dev->tagset.cmd_size, 2069 nvme_pci_cmd_size(dev, true)); 2070 } 2071 dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; 2072 dev->tagset.driver_data = dev; 2073 2074 ret = blk_mq_alloc_tag_set(&dev->tagset); 2075 if (ret) { 2076 dev_warn(dev->ctrl.device, 2077 "IO queues tagset allocation failed %d\n", ret); 2078 return ret; 2079 } 2080 dev->ctrl.tagset = &dev->tagset; 2081 2082 nvme_dbbuf_set(dev); 2083 } else { 2084 blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1); 2085 2086 /* Free previously allocated queues that are no longer usable */ 2087 nvme_free_queues(dev, dev->online_queues); 2088 } 2089 2090 return 0; 2091 } 2092 2093 static int nvme_pci_enable(struct nvme_dev *dev) 2094 { 2095 int result = -ENOMEM; 2096 struct pci_dev *pdev = to_pci_dev(dev->dev); 2097 2098 if (pci_enable_device_mem(pdev)) 2099 return result; 2100 2101 pci_set_master(pdev); 2102 2103 if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && 2104 dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) 2105 goto disable; 2106 2107 if (readl(dev->bar + NVME_REG_CSTS) == -1) { 2108 result = -ENODEV; 2109 goto disable; 2110 } 2111 2112 /* 2113 * Some devices and/or platforms don't advertise or work with INTx 2114 * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll 2115 * adjust this later. 2116 */ 2117 result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); 2118 if (result < 0) 2119 return result; 2120 2121 dev->ctrl.cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 2122 2123 dev->q_depth = min_t(int, NVME_CAP_MQES(dev->ctrl.cap) + 1, 2124 io_queue_depth); 2125 dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap); 2126 dev->dbs = dev->bar + 4096; 2127 2128 /* 2129 * Temporary fix for the Apple controller found in the MacBook8,1 and 2130 * some MacBook7,1 to avoid controller resets and data loss. 2131 */ 2132 if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) { 2133 dev->q_depth = 2; 2134 dev_warn(dev->ctrl.device, "detected Apple NVMe controller, " 2135 "set queue depth=%u to work around controller resets\n", 2136 dev->q_depth); 2137 } else if (pdev->vendor == PCI_VENDOR_ID_SAMSUNG && 2138 (pdev->device == 0xa821 || pdev->device == 0xa822) && 2139 NVME_CAP_MQES(dev->ctrl.cap) == 0) { 2140 dev->q_depth = 64; 2141 dev_err(dev->ctrl.device, "detected PM1725 NVMe controller, " 2142 "set queue depth=%u\n", dev->q_depth); 2143 } 2144 2145 nvme_map_cmb(dev); 2146 2147 pci_enable_pcie_error_reporting(pdev); 2148 pci_save_state(pdev); 2149 return 0; 2150 2151 disable: 2152 pci_disable_device(pdev); 2153 return result; 2154 } 2155 2156 static void nvme_dev_unmap(struct nvme_dev *dev) 2157 { 2158 if (dev->bar) 2159 iounmap(dev->bar); 2160 pci_release_mem_regions(to_pci_dev(dev->dev)); 2161 } 2162 2163 static void nvme_pci_disable(struct nvme_dev *dev) 2164 { 2165 struct pci_dev *pdev = to_pci_dev(dev->dev); 2166 2167 nvme_release_cmb(dev); 2168 pci_free_irq_vectors(pdev); 2169 2170 if (pci_is_enabled(pdev)) { 2171 pci_disable_pcie_error_reporting(pdev); 2172 pci_disable_device(pdev); 2173 } 2174 } 2175 2176 static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown) 2177 { 2178 int i; 2179 bool dead = true; 2180 struct pci_dev *pdev = to_pci_dev(dev->dev); 2181 2182 mutex_lock(&dev->shutdown_lock); 2183 if (pci_is_enabled(pdev)) { 2184 u32 csts = readl(dev->bar + NVME_REG_CSTS); 2185 2186 if (dev->ctrl.state == NVME_CTRL_LIVE || 2187 dev->ctrl.state == NVME_CTRL_RESETTING) 2188 nvme_start_freeze(&dev->ctrl); 2189 dead = !!((csts & NVME_CSTS_CFS) || !(csts & NVME_CSTS_RDY) || 2190 pdev->error_state != pci_channel_io_normal); 2191 } 2192 2193 /* 2194 * Give the controller a chance to complete all entered requests if 2195 * doing a safe shutdown. 2196 */ 2197 if (!dead) { 2198 if (shutdown) 2199 nvme_wait_freeze_timeout(&dev->ctrl, NVME_IO_TIMEOUT); 2200 } 2201 2202 nvme_stop_queues(&dev->ctrl); 2203 2204 if (!dead) { 2205 /* 2206 * If the controller is still alive tell it to stop using the 2207 * host memory buffer. In theory the shutdown / reset should 2208 * make sure that it doesn't access the host memoery anymore, 2209 * but I'd rather be safe than sorry.. 2210 */ 2211 if (dev->host_mem_descs) 2212 nvme_set_host_mem(dev, 0); 2213 nvme_disable_io_queues(dev); 2214 nvme_disable_admin_queue(dev, shutdown); 2215 } 2216 for (i = dev->ctrl.queue_count - 1; i >= 0; i--) 2217 nvme_suspend_queue(&dev->queues[i]); 2218 2219 nvme_pci_disable(dev); 2220 2221 blk_mq_tagset_busy_iter(&dev->tagset, nvme_cancel_request, &dev->ctrl); 2222 blk_mq_tagset_busy_iter(&dev->admin_tagset, nvme_cancel_request, &dev->ctrl); 2223 2224 /* 2225 * The driver will not be starting up queues again if shutting down so 2226 * must flush all entered requests to their failed completion to avoid 2227 * deadlocking blk-mq hot-cpu notifier. 2228 */ 2229 if (shutdown) 2230 nvme_start_queues(&dev->ctrl); 2231 mutex_unlock(&dev->shutdown_lock); 2232 } 2233 2234 static int nvme_setup_prp_pools(struct nvme_dev *dev) 2235 { 2236 dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, 2237 PAGE_SIZE, PAGE_SIZE, 0); 2238 if (!dev->prp_page_pool) 2239 return -ENOMEM; 2240 2241 /* Optimisation for I/Os between 4k and 128k */ 2242 dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, 2243 256, 256, 0); 2244 if (!dev->prp_small_pool) { 2245 dma_pool_destroy(dev->prp_page_pool); 2246 return -ENOMEM; 2247 } 2248 return 0; 2249 } 2250 2251 static void nvme_release_prp_pools(struct nvme_dev *dev) 2252 { 2253 dma_pool_destroy(dev->prp_page_pool); 2254 dma_pool_destroy(dev->prp_small_pool); 2255 } 2256 2257 static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) 2258 { 2259 struct nvme_dev *dev = to_nvme_dev(ctrl); 2260 2261 nvme_dbbuf_dma_free(dev); 2262 put_device(dev->dev); 2263 if (dev->tagset.tags) 2264 blk_mq_free_tag_set(&dev->tagset); 2265 if (dev->ctrl.admin_q) 2266 blk_put_queue(dev->ctrl.admin_q); 2267 kfree(dev->queues); 2268 free_opal_dev(dev->ctrl.opal_dev); 2269 kfree(dev); 2270 } 2271 2272 static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status) 2273 { 2274 dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status); 2275 2276 nvme_get_ctrl(&dev->ctrl); 2277 nvme_dev_disable(dev, false); 2278 if (!queue_work(nvme_wq, &dev->remove_work)) 2279 nvme_put_ctrl(&dev->ctrl); 2280 } 2281 2282 static void nvme_reset_work(struct work_struct *work) 2283 { 2284 struct nvme_dev *dev = 2285 container_of(work, struct nvme_dev, ctrl.reset_work); 2286 bool was_suspend = !!(dev->ctrl.ctrl_config & NVME_CC_SHN_NORMAL); 2287 int result = -ENODEV; 2288 enum nvme_ctrl_state new_state = NVME_CTRL_LIVE; 2289 2290 if (WARN_ON(dev->ctrl.state != NVME_CTRL_RESETTING)) 2291 goto out; 2292 2293 /* 2294 * If we're called to reset a live controller first shut it down before 2295 * moving on. 2296 */ 2297 if (dev->ctrl.ctrl_config & NVME_CC_ENABLE) 2298 nvme_dev_disable(dev, false); 2299 2300 /* 2301 * Introduce CONNECTING state from nvme-fc/rdma transports to mark the 2302 * initializing procedure here. 2303 */ 2304 if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_CONNECTING)) { 2305 dev_warn(dev->ctrl.device, 2306 "failed to mark controller CONNECTING\n"); 2307 goto out; 2308 } 2309 2310 result = nvme_pci_enable(dev); 2311 if (result) 2312 goto out; 2313 2314 result = nvme_pci_configure_admin_queue(dev); 2315 if (result) 2316 goto out; 2317 2318 result = nvme_alloc_admin_tags(dev); 2319 if (result) 2320 goto out; 2321 2322 result = nvme_init_identify(&dev->ctrl); 2323 if (result) 2324 goto out; 2325 2326 if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) { 2327 if (!dev->ctrl.opal_dev) 2328 dev->ctrl.opal_dev = 2329 init_opal_dev(&dev->ctrl, &nvme_sec_submit); 2330 else if (was_suspend) 2331 opal_unlock_from_suspend(dev->ctrl.opal_dev); 2332 } else { 2333 free_opal_dev(dev->ctrl.opal_dev); 2334 dev->ctrl.opal_dev = NULL; 2335 } 2336 2337 if (dev->ctrl.oacs & NVME_CTRL_OACS_DBBUF_SUPP) { 2338 result = nvme_dbbuf_dma_alloc(dev); 2339 if (result) 2340 dev_warn(dev->dev, 2341 "unable to allocate dma for dbbuf\n"); 2342 } 2343 2344 if (dev->ctrl.hmpre) { 2345 result = nvme_setup_host_mem(dev); 2346 if (result < 0) 2347 goto out; 2348 } 2349 2350 result = nvme_setup_io_queues(dev); 2351 if (result) 2352 goto out; 2353 2354 /* 2355 * Keep the controller around but remove all namespaces if we don't have 2356 * any working I/O queue. 2357 */ 2358 if (dev->online_queues < 2) { 2359 dev_warn(dev->ctrl.device, "IO queues not created\n"); 2360 nvme_kill_queues(&dev->ctrl); 2361 nvme_remove_namespaces(&dev->ctrl); 2362 new_state = NVME_CTRL_ADMIN_ONLY; 2363 } else { 2364 nvme_start_queues(&dev->ctrl); 2365 nvme_wait_freeze(&dev->ctrl); 2366 /* hit this only when allocate tagset fails */ 2367 if (nvme_dev_add(dev)) 2368 new_state = NVME_CTRL_ADMIN_ONLY; 2369 nvme_unfreeze(&dev->ctrl); 2370 } 2371 2372 /* 2373 * If only admin queue live, keep it to do further investigation or 2374 * recovery. 2375 */ 2376 if (!nvme_change_ctrl_state(&dev->ctrl, new_state)) { 2377 dev_warn(dev->ctrl.device, 2378 "failed to mark controller state %d\n", new_state); 2379 goto out; 2380 } 2381 2382 nvme_start_ctrl(&dev->ctrl); 2383 return; 2384 2385 out: 2386 nvme_remove_dead_ctrl(dev, result); 2387 } 2388 2389 static void nvme_remove_dead_ctrl_work(struct work_struct *work) 2390 { 2391 struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work); 2392 struct pci_dev *pdev = to_pci_dev(dev->dev); 2393 2394 nvme_kill_queues(&dev->ctrl); 2395 if (pci_get_drvdata(pdev)) 2396 device_release_driver(&pdev->dev); 2397 nvme_put_ctrl(&dev->ctrl); 2398 } 2399 2400 static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) 2401 { 2402 *val = readl(to_nvme_dev(ctrl)->bar + off); 2403 return 0; 2404 } 2405 2406 static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) 2407 { 2408 writel(val, to_nvme_dev(ctrl)->bar + off); 2409 return 0; 2410 } 2411 2412 static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) 2413 { 2414 *val = readq(to_nvme_dev(ctrl)->bar + off); 2415 return 0; 2416 } 2417 2418 static int nvme_pci_get_address(struct nvme_ctrl *ctrl, char *buf, int size) 2419 { 2420 struct pci_dev *pdev = to_pci_dev(to_nvme_dev(ctrl)->dev); 2421 2422 return snprintf(buf, size, "%s", dev_name(&pdev->dev)); 2423 } 2424 2425 static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { 2426 .name = "pcie", 2427 .module = THIS_MODULE, 2428 .flags = NVME_F_METADATA_SUPPORTED, 2429 .reg_read32 = nvme_pci_reg_read32, 2430 .reg_write32 = nvme_pci_reg_write32, 2431 .reg_read64 = nvme_pci_reg_read64, 2432 .free_ctrl = nvme_pci_free_ctrl, 2433 .submit_async_event = nvme_pci_submit_async_event, 2434 .get_address = nvme_pci_get_address, 2435 }; 2436 2437 static int nvme_dev_map(struct nvme_dev *dev) 2438 { 2439 struct pci_dev *pdev = to_pci_dev(dev->dev); 2440 2441 if (pci_request_mem_regions(pdev, "nvme")) 2442 return -ENODEV; 2443 2444 if (nvme_remap_bar(dev, NVME_REG_DBS + 4096)) 2445 goto release; 2446 2447 return 0; 2448 release: 2449 pci_release_mem_regions(pdev); 2450 return -ENODEV; 2451 } 2452 2453 static unsigned long check_vendor_combination_bug(struct pci_dev *pdev) 2454 { 2455 if (pdev->vendor == 0x144d && pdev->device == 0xa802) { 2456 /* 2457 * Several Samsung devices seem to drop off the PCIe bus 2458 * randomly when APST is on and uses the deepest sleep state. 2459 * This has been observed on a Samsung "SM951 NVMe SAMSUNG 2460 * 256GB", a "PM951 NVMe SAMSUNG 512GB", and a "Samsung SSD 2461 * 950 PRO 256GB", but it seems to be restricted to two Dell 2462 * laptops. 2463 */ 2464 if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.") && 2465 (dmi_match(DMI_PRODUCT_NAME, "XPS 15 9550") || 2466 dmi_match(DMI_PRODUCT_NAME, "Precision 5510"))) 2467 return NVME_QUIRK_NO_DEEPEST_PS; 2468 } else if (pdev->vendor == 0x144d && pdev->device == 0xa804) { 2469 /* 2470 * Samsung SSD 960 EVO drops off the PCIe bus after system 2471 * suspend on a Ryzen board, ASUS PRIME B350M-A, as well as 2472 * within few minutes after bootup on a Coffee Lake board - 2473 * ASUS PRIME Z370-A 2474 */ 2475 if (dmi_match(DMI_BOARD_VENDOR, "ASUSTeK COMPUTER INC.") && 2476 (dmi_match(DMI_BOARD_NAME, "PRIME B350M-A") || 2477 dmi_match(DMI_BOARD_NAME, "PRIME Z370-A"))) 2478 return NVME_QUIRK_NO_APST; 2479 } 2480 2481 return 0; 2482 } 2483 2484 static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 2485 { 2486 int node, result = -ENOMEM; 2487 struct nvme_dev *dev; 2488 unsigned long quirks = id->driver_data; 2489 2490 node = dev_to_node(&pdev->dev); 2491 if (node == NUMA_NO_NODE) 2492 set_dev_node(&pdev->dev, first_memory_node); 2493 2494 dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); 2495 if (!dev) 2496 return -ENOMEM; 2497 2498 dev->queues = kcalloc_node(num_possible_cpus() + 1, 2499 sizeof(struct nvme_queue), GFP_KERNEL, node); 2500 if (!dev->queues) 2501 goto free; 2502 2503 dev->dev = get_device(&pdev->dev); 2504 pci_set_drvdata(pdev, dev); 2505 2506 result = nvme_dev_map(dev); 2507 if (result) 2508 goto put_pci; 2509 2510 INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work); 2511 INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work); 2512 mutex_init(&dev->shutdown_lock); 2513 init_completion(&dev->ioq_wait); 2514 2515 result = nvme_setup_prp_pools(dev); 2516 if (result) 2517 goto unmap; 2518 2519 quirks |= check_vendor_combination_bug(pdev); 2520 2521 result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops, 2522 quirks); 2523 if (result) 2524 goto release_pools; 2525 2526 dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev)); 2527 2528 nvme_reset_ctrl(&dev->ctrl); 2529 2530 return 0; 2531 2532 release_pools: 2533 nvme_release_prp_pools(dev); 2534 unmap: 2535 nvme_dev_unmap(dev); 2536 put_pci: 2537 put_device(dev->dev); 2538 free: 2539 kfree(dev->queues); 2540 kfree(dev); 2541 return result; 2542 } 2543 2544 static void nvme_reset_prepare(struct pci_dev *pdev) 2545 { 2546 struct nvme_dev *dev = pci_get_drvdata(pdev); 2547 nvme_dev_disable(dev, false); 2548 } 2549 2550 static void nvme_reset_done(struct pci_dev *pdev) 2551 { 2552 struct nvme_dev *dev = pci_get_drvdata(pdev); 2553 nvme_reset_ctrl_sync(&dev->ctrl); 2554 } 2555 2556 static void nvme_shutdown(struct pci_dev *pdev) 2557 { 2558 struct nvme_dev *dev = pci_get_drvdata(pdev); 2559 nvme_dev_disable(dev, true); 2560 } 2561 2562 /* 2563 * The driver's remove may be called on a device in a partially initialized 2564 * state. This function must not have any dependencies on the device state in 2565 * order to proceed. 2566 */ 2567 static void nvme_remove(struct pci_dev *pdev) 2568 { 2569 struct nvme_dev *dev = pci_get_drvdata(pdev); 2570 2571 nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING); 2572 2573 cancel_work_sync(&dev->ctrl.reset_work); 2574 pci_set_drvdata(pdev, NULL); 2575 2576 if (!pci_device_is_present(pdev)) { 2577 nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD); 2578 nvme_dev_disable(dev, false); 2579 } 2580 2581 flush_work(&dev->ctrl.reset_work); 2582 nvme_stop_ctrl(&dev->ctrl); 2583 nvme_remove_namespaces(&dev->ctrl); 2584 nvme_dev_disable(dev, true); 2585 nvme_free_host_mem(dev); 2586 nvme_dev_remove_admin(dev); 2587 nvme_free_queues(dev, 0); 2588 nvme_uninit_ctrl(&dev->ctrl); 2589 nvme_release_prp_pools(dev); 2590 nvme_dev_unmap(dev); 2591 nvme_put_ctrl(&dev->ctrl); 2592 } 2593 2594 static int nvme_pci_sriov_configure(struct pci_dev *pdev, int numvfs) 2595 { 2596 int ret = 0; 2597 2598 if (numvfs == 0) { 2599 if (pci_vfs_assigned(pdev)) { 2600 dev_warn(&pdev->dev, 2601 "Cannot disable SR-IOV VFs while assigned\n"); 2602 return -EPERM; 2603 } 2604 pci_disable_sriov(pdev); 2605 return 0; 2606 } 2607 2608 ret = pci_enable_sriov(pdev, numvfs); 2609 return ret ? ret : numvfs; 2610 } 2611 2612 #ifdef CONFIG_PM_SLEEP 2613 static int nvme_suspend(struct device *dev) 2614 { 2615 struct pci_dev *pdev = to_pci_dev(dev); 2616 struct nvme_dev *ndev = pci_get_drvdata(pdev); 2617 2618 nvme_dev_disable(ndev, true); 2619 return 0; 2620 } 2621 2622 static int nvme_resume(struct device *dev) 2623 { 2624 struct pci_dev *pdev = to_pci_dev(dev); 2625 struct nvme_dev *ndev = pci_get_drvdata(pdev); 2626 2627 nvme_reset_ctrl(&ndev->ctrl); 2628 return 0; 2629 } 2630 #endif 2631 2632 static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); 2633 2634 static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev, 2635 pci_channel_state_t state) 2636 { 2637 struct nvme_dev *dev = pci_get_drvdata(pdev); 2638 2639 /* 2640 * A frozen channel requires a reset. When detected, this method will 2641 * shutdown the controller to quiesce. The controller will be restarted 2642 * after the slot reset through driver's slot_reset callback. 2643 */ 2644 switch (state) { 2645 case pci_channel_io_normal: 2646 return PCI_ERS_RESULT_CAN_RECOVER; 2647 case pci_channel_io_frozen: 2648 dev_warn(dev->ctrl.device, 2649 "frozen state error detected, reset controller\n"); 2650 nvme_dev_disable(dev, false); 2651 return PCI_ERS_RESULT_NEED_RESET; 2652 case pci_channel_io_perm_failure: 2653 dev_warn(dev->ctrl.device, 2654 "failure state error detected, request disconnect\n"); 2655 return PCI_ERS_RESULT_DISCONNECT; 2656 } 2657 return PCI_ERS_RESULT_NEED_RESET; 2658 } 2659 2660 static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev) 2661 { 2662 struct nvme_dev *dev = pci_get_drvdata(pdev); 2663 2664 dev_info(dev->ctrl.device, "restart after slot reset\n"); 2665 pci_restore_state(pdev); 2666 nvme_reset_ctrl(&dev->ctrl); 2667 return PCI_ERS_RESULT_RECOVERED; 2668 } 2669 2670 static void nvme_error_resume(struct pci_dev *pdev) 2671 { 2672 pci_cleanup_aer_uncorrect_error_status(pdev); 2673 } 2674 2675 static const struct pci_error_handlers nvme_err_handler = { 2676 .error_detected = nvme_error_detected, 2677 .slot_reset = nvme_slot_reset, 2678 .resume = nvme_error_resume, 2679 .reset_prepare = nvme_reset_prepare, 2680 .reset_done = nvme_reset_done, 2681 }; 2682 2683 static const struct pci_device_id nvme_id_table[] = { 2684 { PCI_VDEVICE(INTEL, 0x0953), 2685 .driver_data = NVME_QUIRK_STRIPE_SIZE | 2686 NVME_QUIRK_DEALLOCATE_ZEROES, }, 2687 { PCI_VDEVICE(INTEL, 0x0a53), 2688 .driver_data = NVME_QUIRK_STRIPE_SIZE | 2689 NVME_QUIRK_DEALLOCATE_ZEROES, }, 2690 { PCI_VDEVICE(INTEL, 0x0a54), 2691 .driver_data = NVME_QUIRK_STRIPE_SIZE | 2692 NVME_QUIRK_DEALLOCATE_ZEROES, }, 2693 { PCI_VDEVICE(INTEL, 0x0a55), 2694 .driver_data = NVME_QUIRK_STRIPE_SIZE | 2695 NVME_QUIRK_DEALLOCATE_ZEROES, }, 2696 { PCI_VDEVICE(INTEL, 0xf1a5), /* Intel 600P/P3100 */ 2697 .driver_data = NVME_QUIRK_NO_DEEPEST_PS }, 2698 { PCI_VDEVICE(INTEL, 0x5845), /* Qemu emulated controller */ 2699 .driver_data = NVME_QUIRK_IDENTIFY_CNS, }, 2700 { PCI_DEVICE(0x1c58, 0x0003), /* HGST adapter */ 2701 .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, 2702 { PCI_DEVICE(0x1c58, 0x0023), /* WDC SN200 adapter */ 2703 .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, 2704 { PCI_DEVICE(0x1c5f, 0x0540), /* Memblaze Pblaze4 adapter */ 2705 .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, 2706 { PCI_DEVICE(0x144d, 0xa821), /* Samsung PM1725 */ 2707 .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, 2708 { PCI_DEVICE(0x144d, 0xa822), /* Samsung PM1725a */ 2709 .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, 2710 { PCI_DEVICE(0x1d1d, 0x1f1f), /* LighNVM qemu device */ 2711 .driver_data = NVME_QUIRK_LIGHTNVM, }, 2712 { PCI_DEVICE(0x1d1d, 0x2807), /* CNEX WL */ 2713 .driver_data = NVME_QUIRK_LIGHTNVM, }, 2714 { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, 2715 { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, 2716 { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) }, 2717 { 0, } 2718 }; 2719 MODULE_DEVICE_TABLE(pci, nvme_id_table); 2720 2721 static struct pci_driver nvme_driver = { 2722 .name = "nvme", 2723 .id_table = nvme_id_table, 2724 .probe = nvme_probe, 2725 .remove = nvme_remove, 2726 .shutdown = nvme_shutdown, 2727 .driver = { 2728 .pm = &nvme_dev_pm_ops, 2729 }, 2730 .sriov_configure = nvme_pci_sriov_configure, 2731 .err_handler = &nvme_err_handler, 2732 }; 2733 2734 static int __init nvme_init(void) 2735 { 2736 return pci_register_driver(&nvme_driver); 2737 } 2738 2739 static void __exit nvme_exit(void) 2740 { 2741 pci_unregister_driver(&nvme_driver); 2742 flush_workqueue(nvme_wq); 2743 _nvme_check_size(); 2744 } 2745 2746 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); 2747 MODULE_LICENSE("GPL"); 2748 MODULE_VERSION("1.0"); 2749 module_init(nvme_init); 2750 module_exit(nvme_exit); 2751