157dacad5SJay Sternberg /* 257dacad5SJay Sternberg * NVM Express device driver 357dacad5SJay Sternberg * Copyright (c) 2011-2014, Intel Corporation. 457dacad5SJay Sternberg * 557dacad5SJay Sternberg * This program is free software; you can redistribute it and/or modify it 657dacad5SJay Sternberg * under the terms and conditions of the GNU General Public License, 757dacad5SJay Sternberg * version 2, as published by the Free Software Foundation. 857dacad5SJay Sternberg * 957dacad5SJay Sternberg * This program is distributed in the hope it will be useful, but WITHOUT 1057dacad5SJay Sternberg * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1157dacad5SJay Sternberg * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 1257dacad5SJay Sternberg * more details. 1357dacad5SJay Sternberg */ 1457dacad5SJay Sternberg 15a0a3408eSKeith Busch #include <linux/aer.h> 1657dacad5SJay Sternberg #include <linux/bitops.h> 1757dacad5SJay Sternberg #include <linux/blkdev.h> 1857dacad5SJay Sternberg #include <linux/blk-mq.h> 19dca51e78SChristoph Hellwig #include <linux/blk-mq-pci.h> 2057dacad5SJay Sternberg #include <linux/cpu.h> 2157dacad5SJay Sternberg #include <linux/delay.h> 2257dacad5SJay Sternberg #include <linux/errno.h> 2357dacad5SJay Sternberg #include <linux/fs.h> 2457dacad5SJay Sternberg #include <linux/genhd.h> 2557dacad5SJay Sternberg #include <linux/hdreg.h> 2657dacad5SJay Sternberg #include <linux/idr.h> 2757dacad5SJay Sternberg #include <linux/init.h> 2857dacad5SJay Sternberg #include <linux/interrupt.h> 2957dacad5SJay Sternberg #include <linux/io.h> 3057dacad5SJay Sternberg #include <linux/kdev_t.h> 3157dacad5SJay Sternberg #include <linux/kernel.h> 3257dacad5SJay Sternberg #include <linux/mm.h> 3357dacad5SJay Sternberg #include <linux/module.h> 3457dacad5SJay Sternberg #include <linux/moduleparam.h> 3577bf25eaSKeith Busch #include <linux/mutex.h> 3657dacad5SJay Sternberg #include <linux/pci.h> 3757dacad5SJay Sternberg #include <linux/poison.h> 3857dacad5SJay Sternberg #include <linux/ptrace.h> 3957dacad5SJay Sternberg #include <linux/sched.h> 4057dacad5SJay Sternberg #include <linux/slab.h> 4157dacad5SJay Sternberg #include <linux/t10-pi.h> 422d55cd5fSChristoph Hellwig #include <linux/timer.h> 4357dacad5SJay Sternberg #include <linux/types.h> 449cf5c095SLinus Torvalds #include <linux/io-64-nonatomic-lo-hi.h> 451d277a63SKeith Busch #include <asm/unaligned.h> 4657dacad5SJay Sternberg 4757dacad5SJay Sternberg #include "nvme.h" 4857dacad5SJay Sternberg 4957dacad5SJay Sternberg #define NVME_Q_DEPTH 1024 5057dacad5SJay Sternberg #define NVME_AQ_DEPTH 256 5157dacad5SJay Sternberg #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) 5257dacad5SJay Sternberg #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) 5357dacad5SJay Sternberg 54adf68f21SChristoph Hellwig /* 55adf68f21SChristoph Hellwig * We handle AEN commands ourselves and don't even let the 56adf68f21SChristoph Hellwig * block layer know about them. 57adf68f21SChristoph Hellwig */ 58f866fc42SChristoph Hellwig #define NVME_AQ_BLKMQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AERS) 59adf68f21SChristoph Hellwig 6057dacad5SJay Sternberg static int use_threaded_interrupts; 6157dacad5SJay Sternberg module_param(use_threaded_interrupts, int, 0); 6257dacad5SJay Sternberg 6357dacad5SJay Sternberg static bool use_cmb_sqes = true; 6457dacad5SJay Sternberg module_param(use_cmb_sqes, bool, 0644); 6557dacad5SJay Sternberg MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); 6657dacad5SJay Sternberg 6757dacad5SJay Sternberg static struct workqueue_struct *nvme_workq; 6857dacad5SJay Sternberg 691c63dc66SChristoph Hellwig struct nvme_dev; 701c63dc66SChristoph Hellwig struct nvme_queue; 7157dacad5SJay Sternberg 7257dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev); 73a0fa9647SJens Axboe static void nvme_process_cq(struct nvme_queue *nvmeq); 74a5cdb68cSKeith Busch static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown); 7557dacad5SJay Sternberg 7657dacad5SJay Sternberg /* 771c63dc66SChristoph Hellwig * Represents an NVM Express device. Each nvme_dev is a PCI function. 781c63dc66SChristoph Hellwig */ 791c63dc66SChristoph Hellwig struct nvme_dev { 801c63dc66SChristoph Hellwig struct nvme_queue **queues; 811c63dc66SChristoph Hellwig struct blk_mq_tag_set tagset; 821c63dc66SChristoph Hellwig struct blk_mq_tag_set admin_tagset; 831c63dc66SChristoph Hellwig u32 __iomem *dbs; 841c63dc66SChristoph Hellwig struct device *dev; 851c63dc66SChristoph Hellwig struct dma_pool *prp_page_pool; 861c63dc66SChristoph Hellwig struct dma_pool *prp_small_pool; 871c63dc66SChristoph Hellwig unsigned queue_count; 881c63dc66SChristoph Hellwig unsigned online_queues; 891c63dc66SChristoph Hellwig unsigned max_qid; 901c63dc66SChristoph Hellwig int q_depth; 911c63dc66SChristoph Hellwig u32 db_stride; 921c63dc66SChristoph Hellwig void __iomem *bar; 931c63dc66SChristoph Hellwig struct work_struct reset_work; 945c8809e6SChristoph Hellwig struct work_struct remove_work; 952d55cd5fSChristoph Hellwig struct timer_list watchdog_timer; 9677bf25eaSKeith Busch struct mutex shutdown_lock; 971c63dc66SChristoph Hellwig bool subsystem; 981c63dc66SChristoph Hellwig void __iomem *cmb; 991c63dc66SChristoph Hellwig dma_addr_t cmb_dma_addr; 1001c63dc66SChristoph Hellwig u64 cmb_size; 1011c63dc66SChristoph Hellwig u32 cmbsz; 102202021c1SStephen Bates u32 cmbloc; 1031c63dc66SChristoph Hellwig struct nvme_ctrl ctrl; 104db3cbfffSKeith Busch struct completion ioq_wait; 10557dacad5SJay Sternberg }; 10657dacad5SJay Sternberg 1071c63dc66SChristoph Hellwig static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) 1081c63dc66SChristoph Hellwig { 1091c63dc66SChristoph Hellwig return container_of(ctrl, struct nvme_dev, ctrl); 1101c63dc66SChristoph Hellwig } 1111c63dc66SChristoph Hellwig 11257dacad5SJay Sternberg /* 11357dacad5SJay Sternberg * An NVM Express queue. Each device has at least two (one for admin 11457dacad5SJay Sternberg * commands and one for I/O commands). 11557dacad5SJay Sternberg */ 11657dacad5SJay Sternberg struct nvme_queue { 11757dacad5SJay Sternberg struct device *q_dmadev; 11857dacad5SJay Sternberg struct nvme_dev *dev; 11957dacad5SJay Sternberg char irqname[24]; /* nvme4294967295-65535\0 */ 12057dacad5SJay Sternberg spinlock_t q_lock; 12157dacad5SJay Sternberg struct nvme_command *sq_cmds; 12257dacad5SJay Sternberg struct nvme_command __iomem *sq_cmds_io; 12357dacad5SJay Sternberg volatile struct nvme_completion *cqes; 12457dacad5SJay Sternberg struct blk_mq_tags **tags; 12557dacad5SJay Sternberg dma_addr_t sq_dma_addr; 12657dacad5SJay Sternberg dma_addr_t cq_dma_addr; 12757dacad5SJay Sternberg u32 __iomem *q_db; 12857dacad5SJay Sternberg u16 q_depth; 12957dacad5SJay Sternberg s16 cq_vector; 13057dacad5SJay Sternberg u16 sq_tail; 13157dacad5SJay Sternberg u16 cq_head; 13257dacad5SJay Sternberg u16 qid; 13357dacad5SJay Sternberg u8 cq_phase; 13457dacad5SJay Sternberg u8 cqe_seen; 13557dacad5SJay Sternberg }; 13657dacad5SJay Sternberg 13757dacad5SJay Sternberg /* 13871bd150cSChristoph Hellwig * The nvme_iod describes the data in an I/O, including the list of PRP 13971bd150cSChristoph Hellwig * entries. You can't see it in this data structure because C doesn't let 140f4800d6dSChristoph Hellwig * me express that. Use nvme_init_iod to ensure there's enough space 14171bd150cSChristoph Hellwig * allocated to store the PRP list. 14271bd150cSChristoph Hellwig */ 14371bd150cSChristoph Hellwig struct nvme_iod { 144d49187e9SChristoph Hellwig struct nvme_request req; 145f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq; 146f4800d6dSChristoph Hellwig int aborted; 14771bd150cSChristoph Hellwig int npages; /* In the PRP list. 0 means small pool in use */ 14871bd150cSChristoph Hellwig int nents; /* Used in scatterlist */ 14971bd150cSChristoph Hellwig int length; /* Of data, in bytes */ 15071bd150cSChristoph Hellwig dma_addr_t first_dma; 151bf684057SChristoph Hellwig struct scatterlist meta_sg; /* metadata requires single contiguous buffer */ 152f4800d6dSChristoph Hellwig struct scatterlist *sg; 153f4800d6dSChristoph Hellwig struct scatterlist inline_sg[0]; 15457dacad5SJay Sternberg }; 15557dacad5SJay Sternberg 15657dacad5SJay Sternberg /* 15757dacad5SJay Sternberg * Check we didin't inadvertently grow the command struct 15857dacad5SJay Sternberg */ 15957dacad5SJay Sternberg static inline void _nvme_check_size(void) 16057dacad5SJay Sternberg { 16157dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); 16257dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); 16357dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); 16457dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); 16557dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_features) != 64); 16657dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); 16757dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); 16857dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_command) != 64); 16957dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); 17057dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); 17157dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); 17257dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); 17357dacad5SJay Sternberg } 17457dacad5SJay Sternberg 17557dacad5SJay Sternberg /* 17657dacad5SJay Sternberg * Max size of iod being embedded in the request payload 17757dacad5SJay Sternberg */ 17857dacad5SJay Sternberg #define NVME_INT_PAGES 2 1795fd4ce1bSChristoph Hellwig #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size) 18057dacad5SJay Sternberg 18157dacad5SJay Sternberg /* 18257dacad5SJay Sternberg * Will slightly overestimate the number of pages needed. This is OK 18357dacad5SJay Sternberg * as it only leads to a small amount of wasted memory for the lifetime of 18457dacad5SJay Sternberg * the I/O. 18557dacad5SJay Sternberg */ 18657dacad5SJay Sternberg static int nvme_npages(unsigned size, struct nvme_dev *dev) 18757dacad5SJay Sternberg { 1885fd4ce1bSChristoph Hellwig unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size, 1895fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 19057dacad5SJay Sternberg return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); 19157dacad5SJay Sternberg } 19257dacad5SJay Sternberg 193f4800d6dSChristoph Hellwig static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev, 194f4800d6dSChristoph Hellwig unsigned int size, unsigned int nseg) 195f4800d6dSChristoph Hellwig { 196f4800d6dSChristoph Hellwig return sizeof(__le64 *) * nvme_npages(size, dev) + 197f4800d6dSChristoph Hellwig sizeof(struct scatterlist) * nseg; 198f4800d6dSChristoph Hellwig } 199f4800d6dSChristoph Hellwig 20057dacad5SJay Sternberg static unsigned int nvme_cmd_size(struct nvme_dev *dev) 20157dacad5SJay Sternberg { 202f4800d6dSChristoph Hellwig return sizeof(struct nvme_iod) + 203f4800d6dSChristoph Hellwig nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES); 20457dacad5SJay Sternberg } 20557dacad5SJay Sternberg 206dca51e78SChristoph Hellwig static int nvmeq_irq(struct nvme_queue *nvmeq) 207dca51e78SChristoph Hellwig { 208dca51e78SChristoph Hellwig return pci_irq_vector(to_pci_dev(nvmeq->dev->dev), nvmeq->cq_vector); 209dca51e78SChristoph Hellwig } 210dca51e78SChristoph Hellwig 21157dacad5SJay Sternberg static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 21257dacad5SJay Sternberg unsigned int hctx_idx) 21357dacad5SJay Sternberg { 21457dacad5SJay Sternberg struct nvme_dev *dev = data; 21557dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 21657dacad5SJay Sternberg 21757dacad5SJay Sternberg WARN_ON(hctx_idx != 0); 21857dacad5SJay Sternberg WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); 21957dacad5SJay Sternberg WARN_ON(nvmeq->tags); 22057dacad5SJay Sternberg 22157dacad5SJay Sternberg hctx->driver_data = nvmeq; 22257dacad5SJay Sternberg nvmeq->tags = &dev->admin_tagset.tags[0]; 22357dacad5SJay Sternberg return 0; 22457dacad5SJay Sternberg } 22557dacad5SJay Sternberg 22657dacad5SJay Sternberg static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) 22757dacad5SJay Sternberg { 22857dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 22957dacad5SJay Sternberg 23057dacad5SJay Sternberg nvmeq->tags = NULL; 23157dacad5SJay Sternberg } 23257dacad5SJay Sternberg 23357dacad5SJay Sternberg static int nvme_admin_init_request(void *data, struct request *req, 23457dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 23557dacad5SJay Sternberg unsigned int numa_node) 23657dacad5SJay Sternberg { 23757dacad5SJay Sternberg struct nvme_dev *dev = data; 238f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 23957dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 24057dacad5SJay Sternberg 24157dacad5SJay Sternberg BUG_ON(!nvmeq); 242f4800d6dSChristoph Hellwig iod->nvmeq = nvmeq; 24357dacad5SJay Sternberg return 0; 24457dacad5SJay Sternberg } 24557dacad5SJay Sternberg 24657dacad5SJay Sternberg static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 24757dacad5SJay Sternberg unsigned int hctx_idx) 24857dacad5SJay Sternberg { 24957dacad5SJay Sternberg struct nvme_dev *dev = data; 25057dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 25157dacad5SJay Sternberg 25257dacad5SJay Sternberg if (!nvmeq->tags) 25357dacad5SJay Sternberg nvmeq->tags = &dev->tagset.tags[hctx_idx]; 25457dacad5SJay Sternberg 25557dacad5SJay Sternberg WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); 25657dacad5SJay Sternberg hctx->driver_data = nvmeq; 25757dacad5SJay Sternberg return 0; 25857dacad5SJay Sternberg } 25957dacad5SJay Sternberg 26057dacad5SJay Sternberg static int nvme_init_request(void *data, struct request *req, 26157dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 26257dacad5SJay Sternberg unsigned int numa_node) 26357dacad5SJay Sternberg { 26457dacad5SJay Sternberg struct nvme_dev *dev = data; 265f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 26657dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 26757dacad5SJay Sternberg 26857dacad5SJay Sternberg BUG_ON(!nvmeq); 269f4800d6dSChristoph Hellwig iod->nvmeq = nvmeq; 27057dacad5SJay Sternberg return 0; 27157dacad5SJay Sternberg } 27257dacad5SJay Sternberg 273dca51e78SChristoph Hellwig static int nvme_pci_map_queues(struct blk_mq_tag_set *set) 274dca51e78SChristoph Hellwig { 275dca51e78SChristoph Hellwig struct nvme_dev *dev = set->driver_data; 276dca51e78SChristoph Hellwig 277dca51e78SChristoph Hellwig return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev)); 278dca51e78SChristoph Hellwig } 279dca51e78SChristoph Hellwig 28057dacad5SJay Sternberg /** 281adf68f21SChristoph Hellwig * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell 28257dacad5SJay Sternberg * @nvmeq: The queue to use 28357dacad5SJay Sternberg * @cmd: The command to send 28457dacad5SJay Sternberg * 28557dacad5SJay Sternberg * Safe to use from interrupt context 28657dacad5SJay Sternberg */ 28757dacad5SJay Sternberg static void __nvme_submit_cmd(struct nvme_queue *nvmeq, 28857dacad5SJay Sternberg struct nvme_command *cmd) 28957dacad5SJay Sternberg { 29057dacad5SJay Sternberg u16 tail = nvmeq->sq_tail; 29157dacad5SJay Sternberg 29257dacad5SJay Sternberg if (nvmeq->sq_cmds_io) 29357dacad5SJay Sternberg memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); 29457dacad5SJay Sternberg else 29557dacad5SJay Sternberg memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); 29657dacad5SJay Sternberg 29757dacad5SJay Sternberg if (++tail == nvmeq->q_depth) 29857dacad5SJay Sternberg tail = 0; 29957dacad5SJay Sternberg writel(tail, nvmeq->q_db); 30057dacad5SJay Sternberg nvmeq->sq_tail = tail; 30157dacad5SJay Sternberg } 30257dacad5SJay Sternberg 303f4800d6dSChristoph Hellwig static __le64 **iod_list(struct request *req) 30457dacad5SJay Sternberg { 305f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 306f9d03f96SChristoph Hellwig return (__le64 **)(iod->sg + blk_rq_nr_phys_segments(req)); 30757dacad5SJay Sternberg } 30857dacad5SJay Sternberg 309b131c61dSChristoph Hellwig static int nvme_init_iod(struct request *rq, struct nvme_dev *dev) 31057dacad5SJay Sternberg { 311f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(rq); 312f9d03f96SChristoph Hellwig int nseg = blk_rq_nr_phys_segments(rq); 313b131c61dSChristoph Hellwig unsigned int size = blk_rq_payload_bytes(rq); 314f4800d6dSChristoph Hellwig 315f4800d6dSChristoph Hellwig if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { 316f4800d6dSChristoph Hellwig iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC); 317f4800d6dSChristoph Hellwig if (!iod->sg) 318f4800d6dSChristoph Hellwig return BLK_MQ_RQ_QUEUE_BUSY; 319f4800d6dSChristoph Hellwig } else { 320f4800d6dSChristoph Hellwig iod->sg = iod->inline_sg; 32157dacad5SJay Sternberg } 32257dacad5SJay Sternberg 323f4800d6dSChristoph Hellwig iod->aborted = 0; 32457dacad5SJay Sternberg iod->npages = -1; 32557dacad5SJay Sternberg iod->nents = 0; 326f4800d6dSChristoph Hellwig iod->length = size; 327f80ec966SKeith Busch 328e8064021SChristoph Hellwig if (!(rq->rq_flags & RQF_DONTPREP)) { 329f80ec966SKeith Busch rq->retries = 0; 330e8064021SChristoph Hellwig rq->rq_flags |= RQF_DONTPREP; 331f80ec966SKeith Busch } 332bac0000aSOmar Sandoval return BLK_MQ_RQ_QUEUE_OK; 33357dacad5SJay Sternberg } 33457dacad5SJay Sternberg 335f4800d6dSChristoph Hellwig static void nvme_free_iod(struct nvme_dev *dev, struct request *req) 33657dacad5SJay Sternberg { 337f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 3385fd4ce1bSChristoph Hellwig const int last_prp = dev->ctrl.page_size / 8 - 1; 33957dacad5SJay Sternberg int i; 340f4800d6dSChristoph Hellwig __le64 **list = iod_list(req); 34157dacad5SJay Sternberg dma_addr_t prp_dma = iod->first_dma; 34257dacad5SJay Sternberg 34357dacad5SJay Sternberg if (iod->npages == 0) 34457dacad5SJay Sternberg dma_pool_free(dev->prp_small_pool, list[0], prp_dma); 34557dacad5SJay Sternberg for (i = 0; i < iod->npages; i++) { 34657dacad5SJay Sternberg __le64 *prp_list = list[i]; 34757dacad5SJay Sternberg dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); 34857dacad5SJay Sternberg dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); 34957dacad5SJay Sternberg prp_dma = next_prp_dma; 35057dacad5SJay Sternberg } 35157dacad5SJay Sternberg 352f4800d6dSChristoph Hellwig if (iod->sg != iod->inline_sg) 353f4800d6dSChristoph Hellwig kfree(iod->sg); 35457dacad5SJay Sternberg } 35557dacad5SJay Sternberg 35657dacad5SJay Sternberg #ifdef CONFIG_BLK_DEV_INTEGRITY 35757dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 35857dacad5SJay Sternberg { 35957dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == v) 36057dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(p); 36157dacad5SJay Sternberg } 36257dacad5SJay Sternberg 36357dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 36457dacad5SJay Sternberg { 36557dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == p) 36657dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(v); 36757dacad5SJay Sternberg } 36857dacad5SJay Sternberg 36957dacad5SJay Sternberg /** 37057dacad5SJay Sternberg * nvme_dif_remap - remaps ref tags to bip seed and physical lba 37157dacad5SJay Sternberg * 37257dacad5SJay Sternberg * The virtual start sector is the one that was originally submitted by the 37357dacad5SJay Sternberg * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical 37457dacad5SJay Sternberg * start sector may be different. Remap protection information to match the 37557dacad5SJay Sternberg * physical LBA on writes, and back to the original seed on reads. 37657dacad5SJay Sternberg * 37757dacad5SJay Sternberg * Type 0 and 3 do not have a ref tag, so no remapping required. 37857dacad5SJay Sternberg */ 37957dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 38057dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 38157dacad5SJay Sternberg { 38257dacad5SJay Sternberg struct nvme_ns *ns = req->rq_disk->private_data; 38357dacad5SJay Sternberg struct bio_integrity_payload *bip; 38457dacad5SJay Sternberg struct t10_pi_tuple *pi; 38557dacad5SJay Sternberg void *p, *pmap; 38657dacad5SJay Sternberg u32 i, nlb, ts, phys, virt; 38757dacad5SJay Sternberg 38857dacad5SJay Sternberg if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) 38957dacad5SJay Sternberg return; 39057dacad5SJay Sternberg 39157dacad5SJay Sternberg bip = bio_integrity(req->bio); 39257dacad5SJay Sternberg if (!bip) 39357dacad5SJay Sternberg return; 39457dacad5SJay Sternberg 39557dacad5SJay Sternberg pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; 39657dacad5SJay Sternberg 39757dacad5SJay Sternberg p = pmap; 39857dacad5SJay Sternberg virt = bip_get_seed(bip); 39957dacad5SJay Sternberg phys = nvme_block_nr(ns, blk_rq_pos(req)); 40057dacad5SJay Sternberg nlb = (blk_rq_bytes(req) >> ns->lba_shift); 401ac6fc48cSDan Williams ts = ns->disk->queue->integrity.tuple_size; 40257dacad5SJay Sternberg 40357dacad5SJay Sternberg for (i = 0; i < nlb; i++, virt++, phys++) { 40457dacad5SJay Sternberg pi = (struct t10_pi_tuple *)p; 40557dacad5SJay Sternberg dif_swap(phys, virt, pi); 40657dacad5SJay Sternberg p += ts; 40757dacad5SJay Sternberg } 40857dacad5SJay Sternberg kunmap_atomic(pmap); 40957dacad5SJay Sternberg } 41057dacad5SJay Sternberg #else /* CONFIG_BLK_DEV_INTEGRITY */ 41157dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 41257dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 41357dacad5SJay Sternberg { 41457dacad5SJay Sternberg } 41557dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 41657dacad5SJay Sternberg { 41757dacad5SJay Sternberg } 41857dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 41957dacad5SJay Sternberg { 42057dacad5SJay Sternberg } 42157dacad5SJay Sternberg #endif 42257dacad5SJay Sternberg 423b131c61dSChristoph Hellwig static bool nvme_setup_prps(struct nvme_dev *dev, struct request *req) 42457dacad5SJay Sternberg { 425f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 42657dacad5SJay Sternberg struct dma_pool *pool; 427b131c61dSChristoph Hellwig int length = blk_rq_payload_bytes(req); 42857dacad5SJay Sternberg struct scatterlist *sg = iod->sg; 42957dacad5SJay Sternberg int dma_len = sg_dma_len(sg); 43057dacad5SJay Sternberg u64 dma_addr = sg_dma_address(sg); 4315fd4ce1bSChristoph Hellwig u32 page_size = dev->ctrl.page_size; 43257dacad5SJay Sternberg int offset = dma_addr & (page_size - 1); 43357dacad5SJay Sternberg __le64 *prp_list; 434f4800d6dSChristoph Hellwig __le64 **list = iod_list(req); 43557dacad5SJay Sternberg dma_addr_t prp_dma; 43657dacad5SJay Sternberg int nprps, i; 43757dacad5SJay Sternberg 43857dacad5SJay Sternberg length -= (page_size - offset); 43957dacad5SJay Sternberg if (length <= 0) 44069d2b571SChristoph Hellwig return true; 44157dacad5SJay Sternberg 44257dacad5SJay Sternberg dma_len -= (page_size - offset); 44357dacad5SJay Sternberg if (dma_len) { 44457dacad5SJay Sternberg dma_addr += (page_size - offset); 44557dacad5SJay Sternberg } else { 44657dacad5SJay Sternberg sg = sg_next(sg); 44757dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 44857dacad5SJay Sternberg dma_len = sg_dma_len(sg); 44957dacad5SJay Sternberg } 45057dacad5SJay Sternberg 45157dacad5SJay Sternberg if (length <= page_size) { 45257dacad5SJay Sternberg iod->first_dma = dma_addr; 45369d2b571SChristoph Hellwig return true; 45457dacad5SJay Sternberg } 45557dacad5SJay Sternberg 45657dacad5SJay Sternberg nprps = DIV_ROUND_UP(length, page_size); 45757dacad5SJay Sternberg if (nprps <= (256 / 8)) { 45857dacad5SJay Sternberg pool = dev->prp_small_pool; 45957dacad5SJay Sternberg iod->npages = 0; 46057dacad5SJay Sternberg } else { 46157dacad5SJay Sternberg pool = dev->prp_page_pool; 46257dacad5SJay Sternberg iod->npages = 1; 46357dacad5SJay Sternberg } 46457dacad5SJay Sternberg 46569d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 46657dacad5SJay Sternberg if (!prp_list) { 46757dacad5SJay Sternberg iod->first_dma = dma_addr; 46857dacad5SJay Sternberg iod->npages = -1; 46969d2b571SChristoph Hellwig return false; 47057dacad5SJay Sternberg } 47157dacad5SJay Sternberg list[0] = prp_list; 47257dacad5SJay Sternberg iod->first_dma = prp_dma; 47357dacad5SJay Sternberg i = 0; 47457dacad5SJay Sternberg for (;;) { 47557dacad5SJay Sternberg if (i == page_size >> 3) { 47657dacad5SJay Sternberg __le64 *old_prp_list = prp_list; 47769d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 47857dacad5SJay Sternberg if (!prp_list) 47969d2b571SChristoph Hellwig return false; 48057dacad5SJay Sternberg list[iod->npages++] = prp_list; 48157dacad5SJay Sternberg prp_list[0] = old_prp_list[i - 1]; 48257dacad5SJay Sternberg old_prp_list[i - 1] = cpu_to_le64(prp_dma); 48357dacad5SJay Sternberg i = 1; 48457dacad5SJay Sternberg } 48557dacad5SJay Sternberg prp_list[i++] = cpu_to_le64(dma_addr); 48657dacad5SJay Sternberg dma_len -= page_size; 48757dacad5SJay Sternberg dma_addr += page_size; 48857dacad5SJay Sternberg length -= page_size; 48957dacad5SJay Sternberg if (length <= 0) 49057dacad5SJay Sternberg break; 49157dacad5SJay Sternberg if (dma_len > 0) 49257dacad5SJay Sternberg continue; 49357dacad5SJay Sternberg BUG_ON(dma_len < 0); 49457dacad5SJay Sternberg sg = sg_next(sg); 49557dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 49657dacad5SJay Sternberg dma_len = sg_dma_len(sg); 49757dacad5SJay Sternberg } 49857dacad5SJay Sternberg 49969d2b571SChristoph Hellwig return true; 50057dacad5SJay Sternberg } 50157dacad5SJay Sternberg 502f4800d6dSChristoph Hellwig static int nvme_map_data(struct nvme_dev *dev, struct request *req, 503b131c61dSChristoph Hellwig struct nvme_command *cmnd) 50457dacad5SJay Sternberg { 505f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 506ba1ca37eSChristoph Hellwig struct request_queue *q = req->q; 507ba1ca37eSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 508ba1ca37eSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 509ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_ERROR; 51057dacad5SJay Sternberg 511f9d03f96SChristoph Hellwig sg_init_table(iod->sg, blk_rq_nr_phys_segments(req)); 512ba1ca37eSChristoph Hellwig iod->nents = blk_rq_map_sg(q, req, iod->sg); 513ba1ca37eSChristoph Hellwig if (!iod->nents) 514ba1ca37eSChristoph Hellwig goto out; 515ba1ca37eSChristoph Hellwig 516ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_BUSY; 5172b6b535dSMauricio Faria de Oliveira if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir, 5182b6b535dSMauricio Faria de Oliveira DMA_ATTR_NO_WARN)) 519ba1ca37eSChristoph Hellwig goto out; 520ba1ca37eSChristoph Hellwig 521b131c61dSChristoph Hellwig if (!nvme_setup_prps(dev, req)) 522ba1ca37eSChristoph Hellwig goto out_unmap; 523ba1ca37eSChristoph Hellwig 524ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_ERROR; 525ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) { 526ba1ca37eSChristoph Hellwig if (blk_rq_count_integrity_sg(q, req->bio) != 1) 527ba1ca37eSChristoph Hellwig goto out_unmap; 528ba1ca37eSChristoph Hellwig 529bf684057SChristoph Hellwig sg_init_table(&iod->meta_sg, 1); 530bf684057SChristoph Hellwig if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1) 531ba1ca37eSChristoph Hellwig goto out_unmap; 532ba1ca37eSChristoph Hellwig 533ba1ca37eSChristoph Hellwig if (rq_data_dir(req)) 534ba1ca37eSChristoph Hellwig nvme_dif_remap(req, nvme_dif_prep); 535ba1ca37eSChristoph Hellwig 536bf684057SChristoph Hellwig if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir)) 537ba1ca37eSChristoph Hellwig goto out_unmap; 53857dacad5SJay Sternberg } 53957dacad5SJay Sternberg 540eb793e2cSChristoph Hellwig cmnd->rw.dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); 541eb793e2cSChristoph Hellwig cmnd->rw.dptr.prp2 = cpu_to_le64(iod->first_dma); 542ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) 543bf684057SChristoph Hellwig cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); 544ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_OK; 545ba1ca37eSChristoph Hellwig 546ba1ca37eSChristoph Hellwig out_unmap: 547ba1ca37eSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 548ba1ca37eSChristoph Hellwig out: 549ba1ca37eSChristoph Hellwig return ret; 55057dacad5SJay Sternberg } 55157dacad5SJay Sternberg 552f4800d6dSChristoph Hellwig static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) 553d4f6c3abSChristoph Hellwig { 554f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 555d4f6c3abSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 556d4f6c3abSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 557d4f6c3abSChristoph Hellwig 558d4f6c3abSChristoph Hellwig if (iod->nents) { 559d4f6c3abSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 560d4f6c3abSChristoph Hellwig if (blk_integrity_rq(req)) { 561d4f6c3abSChristoph Hellwig if (!rq_data_dir(req)) 562d4f6c3abSChristoph Hellwig nvme_dif_remap(req, nvme_dif_complete); 563bf684057SChristoph Hellwig dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); 564d4f6c3abSChristoph Hellwig } 565d4f6c3abSChristoph Hellwig } 566d4f6c3abSChristoph Hellwig 567f9d03f96SChristoph Hellwig nvme_cleanup_cmd(req); 568f4800d6dSChristoph Hellwig nvme_free_iod(dev, req); 56957dacad5SJay Sternberg } 57057dacad5SJay Sternberg 57157dacad5SJay Sternberg /* 57257dacad5SJay Sternberg * NOTE: ns is NULL when called on the admin queue. 57357dacad5SJay Sternberg */ 57457dacad5SJay Sternberg static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 57557dacad5SJay Sternberg const struct blk_mq_queue_data *bd) 57657dacad5SJay Sternberg { 57757dacad5SJay Sternberg struct nvme_ns *ns = hctx->queue->queuedata; 57857dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 57957dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 58057dacad5SJay Sternberg struct request *req = bd->rq; 581ba1ca37eSChristoph Hellwig struct nvme_command cmnd; 582ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_OK; 58357dacad5SJay Sternberg 58457dacad5SJay Sternberg /* 58557dacad5SJay Sternberg * If formated with metadata, require the block layer provide a buffer 58657dacad5SJay Sternberg * unless this namespace is formated such that the metadata can be 58757dacad5SJay Sternberg * stripped/generated by the controller with PRACT=1. 58857dacad5SJay Sternberg */ 58957dacad5SJay Sternberg if (ns && ns->ms && !blk_integrity_rq(req)) { 59057dacad5SJay Sternberg if (!(ns->pi_type && ns->ms == 8) && 59157292b58SChristoph Hellwig !blk_rq_is_passthrough(req)) { 592eee417b0SChristoph Hellwig blk_mq_end_request(req, -EFAULT); 59357dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 59457dacad5SJay Sternberg } 59557dacad5SJay Sternberg } 59657dacad5SJay Sternberg 597f9d03f96SChristoph Hellwig ret = nvme_setup_cmd(ns, req, &cmnd); 598bac0000aSOmar Sandoval if (ret != BLK_MQ_RQ_QUEUE_OK) 599f4800d6dSChristoph Hellwig return ret; 60057dacad5SJay Sternberg 601b131c61dSChristoph Hellwig ret = nvme_init_iod(req, dev); 602bac0000aSOmar Sandoval if (ret != BLK_MQ_RQ_QUEUE_OK) 603f9d03f96SChristoph Hellwig goto out_free_cmd; 60457dacad5SJay Sternberg 605f9d03f96SChristoph Hellwig if (blk_rq_nr_phys_segments(req)) 606b131c61dSChristoph Hellwig ret = nvme_map_data(dev, req, &cmnd); 607ba1ca37eSChristoph Hellwig 608bac0000aSOmar Sandoval if (ret != BLK_MQ_RQ_QUEUE_OK) 609f9d03f96SChristoph Hellwig goto out_cleanup_iod; 610ba1ca37eSChristoph Hellwig 611aae239e1SChristoph Hellwig blk_mq_start_request(req); 612ba1ca37eSChristoph Hellwig 613ba1ca37eSChristoph Hellwig spin_lock_irq(&nvmeq->q_lock); 614ae1fba20SKeith Busch if (unlikely(nvmeq->cq_vector < 0)) { 61569d9a99cSKeith Busch if (ns && !test_bit(NVME_NS_DEAD, &ns->flags)) 616ae1fba20SKeith Busch ret = BLK_MQ_RQ_QUEUE_BUSY; 61769d9a99cSKeith Busch else 61869d9a99cSKeith Busch ret = BLK_MQ_RQ_QUEUE_ERROR; 619ae1fba20SKeith Busch spin_unlock_irq(&nvmeq->q_lock); 620f9d03f96SChristoph Hellwig goto out_cleanup_iod; 621ae1fba20SKeith Busch } 622ba1ca37eSChristoph Hellwig __nvme_submit_cmd(nvmeq, &cmnd); 62357dacad5SJay Sternberg nvme_process_cq(nvmeq); 62457dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 62557dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 626f9d03f96SChristoph Hellwig out_cleanup_iod: 627f4800d6dSChristoph Hellwig nvme_free_iod(dev, req); 628f9d03f96SChristoph Hellwig out_free_cmd: 629f9d03f96SChristoph Hellwig nvme_cleanup_cmd(req); 630ba1ca37eSChristoph Hellwig return ret; 63157dacad5SJay Sternberg } 63257dacad5SJay Sternberg 633eee417b0SChristoph Hellwig static void nvme_complete_rq(struct request *req) 634eee417b0SChristoph Hellwig { 635f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 636f4800d6dSChristoph Hellwig struct nvme_dev *dev = iod->nvmeq->dev; 637eee417b0SChristoph Hellwig int error = 0; 638eee417b0SChristoph Hellwig 639f4800d6dSChristoph Hellwig nvme_unmap_data(dev, req); 640eee417b0SChristoph Hellwig 641eee417b0SChristoph Hellwig if (unlikely(req->errors)) { 642eee417b0SChristoph Hellwig if (nvme_req_needs_retry(req, req->errors)) { 643f80ec966SKeith Busch req->retries++; 644eee417b0SChristoph Hellwig nvme_requeue_req(req); 645eee417b0SChristoph Hellwig return; 646eee417b0SChristoph Hellwig } 647eee417b0SChristoph Hellwig 64857292b58SChristoph Hellwig if (blk_rq_is_passthrough(req)) 649eee417b0SChristoph Hellwig error = req->errors; 650eee417b0SChristoph Hellwig else 651eee417b0SChristoph Hellwig error = nvme_error_status(req->errors); 652eee417b0SChristoph Hellwig } 653eee417b0SChristoph Hellwig 654f4800d6dSChristoph Hellwig if (unlikely(iod->aborted)) { 6551b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 656eee417b0SChristoph Hellwig "completing aborted command with status: %04x\n", 657eee417b0SChristoph Hellwig req->errors); 658eee417b0SChristoph Hellwig } 659eee417b0SChristoph Hellwig 660eee417b0SChristoph Hellwig blk_mq_end_request(req, error); 66157dacad5SJay Sternberg } 66257dacad5SJay Sternberg 663d783e0bdSMarta Rybczynska /* We read the CQE phase first to check if the rest of the entry is valid */ 664d783e0bdSMarta Rybczynska static inline bool nvme_cqe_valid(struct nvme_queue *nvmeq, u16 head, 665d783e0bdSMarta Rybczynska u16 phase) 666d783e0bdSMarta Rybczynska { 667d783e0bdSMarta Rybczynska return (le16_to_cpu(nvmeq->cqes[head].status) & 1) == phase; 668d783e0bdSMarta Rybczynska } 669d783e0bdSMarta Rybczynska 670a0fa9647SJens Axboe static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag) 67157dacad5SJay Sternberg { 67257dacad5SJay Sternberg u16 head, phase; 67357dacad5SJay Sternberg 67457dacad5SJay Sternberg head = nvmeq->cq_head; 67557dacad5SJay Sternberg phase = nvmeq->cq_phase; 67657dacad5SJay Sternberg 677d783e0bdSMarta Rybczynska while (nvme_cqe_valid(nvmeq, head, phase)) { 67857dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[head]; 679eee417b0SChristoph Hellwig struct request *req; 680adf68f21SChristoph Hellwig 68157dacad5SJay Sternberg if (++head == nvmeq->q_depth) { 68257dacad5SJay Sternberg head = 0; 68357dacad5SJay Sternberg phase = !phase; 68457dacad5SJay Sternberg } 685adf68f21SChristoph Hellwig 686a0fa9647SJens Axboe if (tag && *tag == cqe.command_id) 687a0fa9647SJens Axboe *tag = -1; 688adf68f21SChristoph Hellwig 689aae239e1SChristoph Hellwig if (unlikely(cqe.command_id >= nvmeq->q_depth)) { 6901b3c47c1SSagi Grimberg dev_warn(nvmeq->dev->ctrl.device, 691aae239e1SChristoph Hellwig "invalid id %d completed on queue %d\n", 692aae239e1SChristoph Hellwig cqe.command_id, le16_to_cpu(cqe.sq_id)); 693aae239e1SChristoph Hellwig continue; 694aae239e1SChristoph Hellwig } 695aae239e1SChristoph Hellwig 696adf68f21SChristoph Hellwig /* 697adf68f21SChristoph Hellwig * AEN requests are special as they don't time out and can 698adf68f21SChristoph Hellwig * survive any kind of queue freeze and often don't respond to 699adf68f21SChristoph Hellwig * aborts. We don't even bother to allocate a struct request 700adf68f21SChristoph Hellwig * for them but rather special case them here. 701adf68f21SChristoph Hellwig */ 702adf68f21SChristoph Hellwig if (unlikely(nvmeq->qid == 0 && 703adf68f21SChristoph Hellwig cqe.command_id >= NVME_AQ_BLKMQ_DEPTH)) { 7047bf58533SChristoph Hellwig nvme_complete_async_event(&nvmeq->dev->ctrl, 7057bf58533SChristoph Hellwig cqe.status, &cqe.result); 706adf68f21SChristoph Hellwig continue; 707adf68f21SChristoph Hellwig } 708adf68f21SChristoph Hellwig 709eee417b0SChristoph Hellwig req = blk_mq_tag_to_rq(*nvmeq->tags, cqe.command_id); 710d49187e9SChristoph Hellwig nvme_req(req)->result = cqe.result; 711d783e0bdSMarta Rybczynska blk_mq_complete_request(req, le16_to_cpu(cqe.status) >> 1); 71257dacad5SJay Sternberg } 71357dacad5SJay Sternberg 71457dacad5SJay Sternberg if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) 715a0fa9647SJens Axboe return; 71657dacad5SJay Sternberg 717604e8c8dSKeith Busch if (likely(nvmeq->cq_vector >= 0)) 71857dacad5SJay Sternberg writel(head, nvmeq->q_db + nvmeq->dev->db_stride); 71957dacad5SJay Sternberg nvmeq->cq_head = head; 72057dacad5SJay Sternberg nvmeq->cq_phase = phase; 72157dacad5SJay Sternberg 72257dacad5SJay Sternberg nvmeq->cqe_seen = 1; 723a0fa9647SJens Axboe } 724a0fa9647SJens Axboe 725a0fa9647SJens Axboe static void nvme_process_cq(struct nvme_queue *nvmeq) 726a0fa9647SJens Axboe { 727a0fa9647SJens Axboe __nvme_process_cq(nvmeq, NULL); 72857dacad5SJay Sternberg } 72957dacad5SJay Sternberg 73057dacad5SJay Sternberg static irqreturn_t nvme_irq(int irq, void *data) 73157dacad5SJay Sternberg { 73257dacad5SJay Sternberg irqreturn_t result; 73357dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 73457dacad5SJay Sternberg spin_lock(&nvmeq->q_lock); 73557dacad5SJay Sternberg nvme_process_cq(nvmeq); 73657dacad5SJay Sternberg result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; 73757dacad5SJay Sternberg nvmeq->cqe_seen = 0; 73857dacad5SJay Sternberg spin_unlock(&nvmeq->q_lock); 73957dacad5SJay Sternberg return result; 74057dacad5SJay Sternberg } 74157dacad5SJay Sternberg 74257dacad5SJay Sternberg static irqreturn_t nvme_irq_check(int irq, void *data) 74357dacad5SJay Sternberg { 74457dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 745d783e0bdSMarta Rybczynska if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) 74657dacad5SJay Sternberg return IRQ_WAKE_THREAD; 747d783e0bdSMarta Rybczynska return IRQ_NONE; 74857dacad5SJay Sternberg } 74957dacad5SJay Sternberg 750a0fa9647SJens Axboe static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) 751a0fa9647SJens Axboe { 752a0fa9647SJens Axboe struct nvme_queue *nvmeq = hctx->driver_data; 753a0fa9647SJens Axboe 754d783e0bdSMarta Rybczynska if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) { 755a0fa9647SJens Axboe spin_lock_irq(&nvmeq->q_lock); 756a0fa9647SJens Axboe __nvme_process_cq(nvmeq, &tag); 757a0fa9647SJens Axboe spin_unlock_irq(&nvmeq->q_lock); 758a0fa9647SJens Axboe 759a0fa9647SJens Axboe if (tag == -1) 760a0fa9647SJens Axboe return 1; 761a0fa9647SJens Axboe } 762a0fa9647SJens Axboe 763a0fa9647SJens Axboe return 0; 764a0fa9647SJens Axboe } 765a0fa9647SJens Axboe 766f866fc42SChristoph Hellwig static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx) 76757dacad5SJay Sternberg { 768f866fc42SChristoph Hellwig struct nvme_dev *dev = to_nvme_dev(ctrl); 7699396dec9SChristoph Hellwig struct nvme_queue *nvmeq = dev->queues[0]; 77057dacad5SJay Sternberg struct nvme_command c; 77157dacad5SJay Sternberg 77257dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 77357dacad5SJay Sternberg c.common.opcode = nvme_admin_async_event; 774f866fc42SChristoph Hellwig c.common.command_id = NVME_AQ_BLKMQ_DEPTH + aer_idx; 77557dacad5SJay Sternberg 7769396dec9SChristoph Hellwig spin_lock_irq(&nvmeq->q_lock); 7779396dec9SChristoph Hellwig __nvme_submit_cmd(nvmeq, &c); 7789396dec9SChristoph Hellwig spin_unlock_irq(&nvmeq->q_lock); 77957dacad5SJay Sternberg } 78057dacad5SJay Sternberg 78157dacad5SJay Sternberg static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) 78257dacad5SJay Sternberg { 78357dacad5SJay Sternberg struct nvme_command c; 78457dacad5SJay Sternberg 78557dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 78657dacad5SJay Sternberg c.delete_queue.opcode = opcode; 78757dacad5SJay Sternberg c.delete_queue.qid = cpu_to_le16(id); 78857dacad5SJay Sternberg 7891c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 79057dacad5SJay Sternberg } 79157dacad5SJay Sternberg 79257dacad5SJay Sternberg static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, 79357dacad5SJay Sternberg struct nvme_queue *nvmeq) 79457dacad5SJay Sternberg { 79557dacad5SJay Sternberg struct nvme_command c; 79657dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; 79757dacad5SJay Sternberg 79857dacad5SJay Sternberg /* 79957dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 80057dacad5SJay Sternberg * is attached to the request. 80157dacad5SJay Sternberg */ 80257dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 80357dacad5SJay Sternberg c.create_cq.opcode = nvme_admin_create_cq; 80457dacad5SJay Sternberg c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); 80557dacad5SJay Sternberg c.create_cq.cqid = cpu_to_le16(qid); 80657dacad5SJay Sternberg c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 80757dacad5SJay Sternberg c.create_cq.cq_flags = cpu_to_le16(flags); 80857dacad5SJay Sternberg c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); 80957dacad5SJay Sternberg 8101c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 81157dacad5SJay Sternberg } 81257dacad5SJay Sternberg 81357dacad5SJay Sternberg static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, 81457dacad5SJay Sternberg struct nvme_queue *nvmeq) 81557dacad5SJay Sternberg { 81657dacad5SJay Sternberg struct nvme_command c; 81757dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; 81857dacad5SJay Sternberg 81957dacad5SJay Sternberg /* 82057dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 82157dacad5SJay Sternberg * is attached to the request. 82257dacad5SJay Sternberg */ 82357dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 82457dacad5SJay Sternberg c.create_sq.opcode = nvme_admin_create_sq; 82557dacad5SJay Sternberg c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); 82657dacad5SJay Sternberg c.create_sq.sqid = cpu_to_le16(qid); 82757dacad5SJay Sternberg c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 82857dacad5SJay Sternberg c.create_sq.sq_flags = cpu_to_le16(flags); 82957dacad5SJay Sternberg c.create_sq.cqid = cpu_to_le16(qid); 83057dacad5SJay Sternberg 8311c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 83257dacad5SJay Sternberg } 83357dacad5SJay Sternberg 83457dacad5SJay Sternberg static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) 83557dacad5SJay Sternberg { 83657dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); 83757dacad5SJay Sternberg } 83857dacad5SJay Sternberg 83957dacad5SJay Sternberg static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) 84057dacad5SJay Sternberg { 84157dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); 84257dacad5SJay Sternberg } 84357dacad5SJay Sternberg 844e7a2a87dSChristoph Hellwig static void abort_endio(struct request *req, int error) 84557dacad5SJay Sternberg { 846f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 847f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq = iod->nvmeq; 848e7a2a87dSChristoph Hellwig u16 status = req->errors; 84957dacad5SJay Sternberg 8501cb3cce5SChristoph Hellwig dev_warn(nvmeq->dev->ctrl.device, "Abort status: 0x%x", status); 851e7a2a87dSChristoph Hellwig atomic_inc(&nvmeq->dev->ctrl.abort_limit); 852e7a2a87dSChristoph Hellwig blk_mq_free_request(req); 85357dacad5SJay Sternberg } 85457dacad5SJay Sternberg 85531c7c7d2SChristoph Hellwig static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) 85657dacad5SJay Sternberg { 857f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 858f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq = iod->nvmeq; 85957dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 86057dacad5SJay Sternberg struct request *abort_req; 86157dacad5SJay Sternberg struct nvme_command cmd; 86257dacad5SJay Sternberg 86331c7c7d2SChristoph Hellwig /* 864fd634f41SChristoph Hellwig * Shutdown immediately if controller times out while starting. The 865fd634f41SChristoph Hellwig * reset work will see the pci device disabled when it gets the forced 866fd634f41SChristoph Hellwig * cancellation error. All outstanding requests are completed on 867fd634f41SChristoph Hellwig * shutdown, so we return BLK_EH_HANDLED. 868fd634f41SChristoph Hellwig */ 869bb8d261eSChristoph Hellwig if (dev->ctrl.state == NVME_CTRL_RESETTING) { 8701b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 871fd634f41SChristoph Hellwig "I/O %d QID %d timeout, disable controller\n", 872fd634f41SChristoph Hellwig req->tag, nvmeq->qid); 873a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 874fd634f41SChristoph Hellwig req->errors = NVME_SC_CANCELLED; 875fd634f41SChristoph Hellwig return BLK_EH_HANDLED; 876fd634f41SChristoph Hellwig } 877fd634f41SChristoph Hellwig 878fd634f41SChristoph Hellwig /* 879e1569a16SKeith Busch * Shutdown the controller immediately and schedule a reset if the 880e1569a16SKeith Busch * command was already aborted once before and still hasn't been 881e1569a16SKeith Busch * returned to the driver, or if this is the admin queue. 88231c7c7d2SChristoph Hellwig */ 883f4800d6dSChristoph Hellwig if (!nvmeq->qid || iod->aborted) { 8841b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 88557dacad5SJay Sternberg "I/O %d QID %d timeout, reset controller\n", 88657dacad5SJay Sternberg req->tag, nvmeq->qid); 887a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 888c5f6ce97SKeith Busch nvme_reset(dev); 889e1569a16SKeith Busch 890e1569a16SKeith Busch /* 891e1569a16SKeith Busch * Mark the request as handled, since the inline shutdown 892e1569a16SKeith Busch * forces all outstanding requests to complete. 893e1569a16SKeith Busch */ 894e1569a16SKeith Busch req->errors = NVME_SC_CANCELLED; 895e1569a16SKeith Busch return BLK_EH_HANDLED; 89657dacad5SJay Sternberg } 89757dacad5SJay Sternberg 898f4800d6dSChristoph Hellwig iod->aborted = 1; 89957dacad5SJay Sternberg 900e7a2a87dSChristoph Hellwig if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) { 901e7a2a87dSChristoph Hellwig atomic_inc(&dev->ctrl.abort_limit); 902e7a2a87dSChristoph Hellwig return BLK_EH_RESET_TIMER; 903e7a2a87dSChristoph Hellwig } 90457dacad5SJay Sternberg 90557dacad5SJay Sternberg memset(&cmd, 0, sizeof(cmd)); 90657dacad5SJay Sternberg cmd.abort.opcode = nvme_admin_abort_cmd; 90757dacad5SJay Sternberg cmd.abort.cid = req->tag; 90857dacad5SJay Sternberg cmd.abort.sqid = cpu_to_le16(nvmeq->qid); 90957dacad5SJay Sternberg 9101b3c47c1SSagi Grimberg dev_warn(nvmeq->dev->ctrl.device, 9111b3c47c1SSagi Grimberg "I/O %d QID %d timeout, aborting\n", 91257dacad5SJay Sternberg req->tag, nvmeq->qid); 913e7a2a87dSChristoph Hellwig 914e7a2a87dSChristoph Hellwig abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd, 915eb71f435SChristoph Hellwig BLK_MQ_REQ_NOWAIT, NVME_QID_ANY); 9166bf25d16SChristoph Hellwig if (IS_ERR(abort_req)) { 9176bf25d16SChristoph Hellwig atomic_inc(&dev->ctrl.abort_limit); 91831c7c7d2SChristoph Hellwig return BLK_EH_RESET_TIMER; 91957dacad5SJay Sternberg } 92057dacad5SJay Sternberg 921e7a2a87dSChristoph Hellwig abort_req->timeout = ADMIN_TIMEOUT; 922e7a2a87dSChristoph Hellwig abort_req->end_io_data = NULL; 923e7a2a87dSChristoph Hellwig blk_execute_rq_nowait(abort_req->q, NULL, abort_req, 0, abort_endio); 92457dacad5SJay Sternberg 92557dacad5SJay Sternberg /* 92657dacad5SJay Sternberg * The aborted req will be completed on receiving the abort req. 92757dacad5SJay Sternberg * We enable the timer again. If hit twice, it'll cause a device reset, 92857dacad5SJay Sternberg * as the device then is in a faulty state. 92957dacad5SJay Sternberg */ 93057dacad5SJay Sternberg return BLK_EH_RESET_TIMER; 93157dacad5SJay Sternberg } 93257dacad5SJay Sternberg 93357dacad5SJay Sternberg static void nvme_free_queue(struct nvme_queue *nvmeq) 93457dacad5SJay Sternberg { 93557dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), 93657dacad5SJay Sternberg (void *)nvmeq->cqes, nvmeq->cq_dma_addr); 93757dacad5SJay Sternberg if (nvmeq->sq_cmds) 93857dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), 93957dacad5SJay Sternberg nvmeq->sq_cmds, nvmeq->sq_dma_addr); 94057dacad5SJay Sternberg kfree(nvmeq); 94157dacad5SJay Sternberg } 94257dacad5SJay Sternberg 94357dacad5SJay Sternberg static void nvme_free_queues(struct nvme_dev *dev, int lowest) 94457dacad5SJay Sternberg { 94557dacad5SJay Sternberg int i; 94657dacad5SJay Sternberg 94757dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= lowest; i--) { 94857dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 94957dacad5SJay Sternberg dev->queue_count--; 95057dacad5SJay Sternberg dev->queues[i] = NULL; 95157dacad5SJay Sternberg nvme_free_queue(nvmeq); 95257dacad5SJay Sternberg } 95357dacad5SJay Sternberg } 95457dacad5SJay Sternberg 95557dacad5SJay Sternberg /** 95657dacad5SJay Sternberg * nvme_suspend_queue - put queue into suspended state 95757dacad5SJay Sternberg * @nvmeq - queue to suspend 95857dacad5SJay Sternberg */ 95957dacad5SJay Sternberg static int nvme_suspend_queue(struct nvme_queue *nvmeq) 96057dacad5SJay Sternberg { 96157dacad5SJay Sternberg int vector; 96257dacad5SJay Sternberg 96357dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 96457dacad5SJay Sternberg if (nvmeq->cq_vector == -1) { 96557dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 96657dacad5SJay Sternberg return 1; 96757dacad5SJay Sternberg } 968dca51e78SChristoph Hellwig vector = nvmeq_irq(nvmeq); 96957dacad5SJay Sternberg nvmeq->dev->online_queues--; 97057dacad5SJay Sternberg nvmeq->cq_vector = -1; 97157dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 97257dacad5SJay Sternberg 9731c63dc66SChristoph Hellwig if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) 97425646264SKeith Busch blk_mq_stop_hw_queues(nvmeq->dev->ctrl.admin_q); 97557dacad5SJay Sternberg 97657dacad5SJay Sternberg free_irq(vector, nvmeq); 97757dacad5SJay Sternberg 97857dacad5SJay Sternberg return 0; 97957dacad5SJay Sternberg } 98057dacad5SJay Sternberg 981a5cdb68cSKeith Busch static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown) 98257dacad5SJay Sternberg { 983a5cdb68cSKeith Busch struct nvme_queue *nvmeq = dev->queues[0]; 98457dacad5SJay Sternberg 98557dacad5SJay Sternberg if (!nvmeq) 98657dacad5SJay Sternberg return; 98757dacad5SJay Sternberg if (nvme_suspend_queue(nvmeq)) 98857dacad5SJay Sternberg return; 98957dacad5SJay Sternberg 990a5cdb68cSKeith Busch if (shutdown) 991a5cdb68cSKeith Busch nvme_shutdown_ctrl(&dev->ctrl); 992a5cdb68cSKeith Busch else 993a5cdb68cSKeith Busch nvme_disable_ctrl(&dev->ctrl, lo_hi_readq( 994a5cdb68cSKeith Busch dev->bar + NVME_REG_CAP)); 99557dacad5SJay Sternberg 99657dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 99757dacad5SJay Sternberg nvme_process_cq(nvmeq); 99857dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 99957dacad5SJay Sternberg } 100057dacad5SJay Sternberg 100157dacad5SJay Sternberg static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, 100257dacad5SJay Sternberg int entry_size) 100357dacad5SJay Sternberg { 100457dacad5SJay Sternberg int q_depth = dev->q_depth; 10055fd4ce1bSChristoph Hellwig unsigned q_size_aligned = roundup(q_depth * entry_size, 10065fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 100757dacad5SJay Sternberg 100857dacad5SJay Sternberg if (q_size_aligned * nr_io_queues > dev->cmb_size) { 100957dacad5SJay Sternberg u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); 10105fd4ce1bSChristoph Hellwig mem_per_q = round_down(mem_per_q, dev->ctrl.page_size); 101157dacad5SJay Sternberg q_depth = div_u64(mem_per_q, entry_size); 101257dacad5SJay Sternberg 101357dacad5SJay Sternberg /* 101457dacad5SJay Sternberg * Ensure the reduced q_depth is above some threshold where it 101557dacad5SJay Sternberg * would be better to map queues in system memory with the 101657dacad5SJay Sternberg * original depth 101757dacad5SJay Sternberg */ 101857dacad5SJay Sternberg if (q_depth < 64) 101957dacad5SJay Sternberg return -ENOMEM; 102057dacad5SJay Sternberg } 102157dacad5SJay Sternberg 102257dacad5SJay Sternberg return q_depth; 102357dacad5SJay Sternberg } 102457dacad5SJay Sternberg 102557dacad5SJay Sternberg static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, 102657dacad5SJay Sternberg int qid, int depth) 102757dacad5SJay Sternberg { 102857dacad5SJay Sternberg if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { 10295fd4ce1bSChristoph Hellwig unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth), 10305fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 103157dacad5SJay Sternberg nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; 103257dacad5SJay Sternberg nvmeq->sq_cmds_io = dev->cmb + offset; 103357dacad5SJay Sternberg } else { 103457dacad5SJay Sternberg nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), 103557dacad5SJay Sternberg &nvmeq->sq_dma_addr, GFP_KERNEL); 103657dacad5SJay Sternberg if (!nvmeq->sq_cmds) 103757dacad5SJay Sternberg return -ENOMEM; 103857dacad5SJay Sternberg } 103957dacad5SJay Sternberg 104057dacad5SJay Sternberg return 0; 104157dacad5SJay Sternberg } 104257dacad5SJay Sternberg 104357dacad5SJay Sternberg static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, 104457dacad5SJay Sternberg int depth) 104557dacad5SJay Sternberg { 104657dacad5SJay Sternberg struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL); 104757dacad5SJay Sternberg if (!nvmeq) 104857dacad5SJay Sternberg return NULL; 104957dacad5SJay Sternberg 105057dacad5SJay Sternberg nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), 105157dacad5SJay Sternberg &nvmeq->cq_dma_addr, GFP_KERNEL); 105257dacad5SJay Sternberg if (!nvmeq->cqes) 105357dacad5SJay Sternberg goto free_nvmeq; 105457dacad5SJay Sternberg 105557dacad5SJay Sternberg if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) 105657dacad5SJay Sternberg goto free_cqdma; 105757dacad5SJay Sternberg 105857dacad5SJay Sternberg nvmeq->q_dmadev = dev->dev; 105957dacad5SJay Sternberg nvmeq->dev = dev; 106057dacad5SJay Sternberg snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", 10611c63dc66SChristoph Hellwig dev->ctrl.instance, qid); 106257dacad5SJay Sternberg spin_lock_init(&nvmeq->q_lock); 106357dacad5SJay Sternberg nvmeq->cq_head = 0; 106457dacad5SJay Sternberg nvmeq->cq_phase = 1; 106557dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 106657dacad5SJay Sternberg nvmeq->q_depth = depth; 106757dacad5SJay Sternberg nvmeq->qid = qid; 106857dacad5SJay Sternberg nvmeq->cq_vector = -1; 106957dacad5SJay Sternberg dev->queues[qid] = nvmeq; 107057dacad5SJay Sternberg dev->queue_count++; 107157dacad5SJay Sternberg 107257dacad5SJay Sternberg return nvmeq; 107357dacad5SJay Sternberg 107457dacad5SJay Sternberg free_cqdma: 107557dacad5SJay Sternberg dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, 107657dacad5SJay Sternberg nvmeq->cq_dma_addr); 107757dacad5SJay Sternberg free_nvmeq: 107857dacad5SJay Sternberg kfree(nvmeq); 107957dacad5SJay Sternberg return NULL; 108057dacad5SJay Sternberg } 108157dacad5SJay Sternberg 1082dca51e78SChristoph Hellwig static int queue_request_irq(struct nvme_queue *nvmeq) 108357dacad5SJay Sternberg { 108457dacad5SJay Sternberg if (use_threaded_interrupts) 1085dca51e78SChristoph Hellwig return request_threaded_irq(nvmeq_irq(nvmeq), nvme_irq_check, 1086dca51e78SChristoph Hellwig nvme_irq, IRQF_SHARED, nvmeq->irqname, nvmeq); 1087dca51e78SChristoph Hellwig else 1088dca51e78SChristoph Hellwig return request_irq(nvmeq_irq(nvmeq), nvme_irq, IRQF_SHARED, 1089dca51e78SChristoph Hellwig nvmeq->irqname, nvmeq); 109057dacad5SJay Sternberg } 109157dacad5SJay Sternberg 109257dacad5SJay Sternberg static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) 109357dacad5SJay Sternberg { 109457dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 109557dacad5SJay Sternberg 109657dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 109757dacad5SJay Sternberg nvmeq->sq_tail = 0; 109857dacad5SJay Sternberg nvmeq->cq_head = 0; 109957dacad5SJay Sternberg nvmeq->cq_phase = 1; 110057dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 110157dacad5SJay Sternberg memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); 110257dacad5SJay Sternberg dev->online_queues++; 110357dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 110457dacad5SJay Sternberg } 110557dacad5SJay Sternberg 110657dacad5SJay Sternberg static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) 110757dacad5SJay Sternberg { 110857dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 110957dacad5SJay Sternberg int result; 111057dacad5SJay Sternberg 111157dacad5SJay Sternberg nvmeq->cq_vector = qid - 1; 111257dacad5SJay Sternberg result = adapter_alloc_cq(dev, qid, nvmeq); 111357dacad5SJay Sternberg if (result < 0) 111457dacad5SJay Sternberg return result; 111557dacad5SJay Sternberg 111657dacad5SJay Sternberg result = adapter_alloc_sq(dev, qid, nvmeq); 111757dacad5SJay Sternberg if (result < 0) 111857dacad5SJay Sternberg goto release_cq; 111957dacad5SJay Sternberg 1120dca51e78SChristoph Hellwig result = queue_request_irq(nvmeq); 112157dacad5SJay Sternberg if (result < 0) 112257dacad5SJay Sternberg goto release_sq; 112357dacad5SJay Sternberg 112457dacad5SJay Sternberg nvme_init_queue(nvmeq, qid); 112557dacad5SJay Sternberg return result; 112657dacad5SJay Sternberg 112757dacad5SJay Sternberg release_sq: 112857dacad5SJay Sternberg adapter_delete_sq(dev, qid); 112957dacad5SJay Sternberg release_cq: 113057dacad5SJay Sternberg adapter_delete_cq(dev, qid); 113157dacad5SJay Sternberg return result; 113257dacad5SJay Sternberg } 113357dacad5SJay Sternberg 113457dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_admin_ops = { 113557dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 1136eee417b0SChristoph Hellwig .complete = nvme_complete_rq, 113757dacad5SJay Sternberg .init_hctx = nvme_admin_init_hctx, 113857dacad5SJay Sternberg .exit_hctx = nvme_admin_exit_hctx, 113957dacad5SJay Sternberg .init_request = nvme_admin_init_request, 114057dacad5SJay Sternberg .timeout = nvme_timeout, 114157dacad5SJay Sternberg }; 114257dacad5SJay Sternberg 114357dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_ops = { 114457dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 1145eee417b0SChristoph Hellwig .complete = nvme_complete_rq, 114657dacad5SJay Sternberg .init_hctx = nvme_init_hctx, 114757dacad5SJay Sternberg .init_request = nvme_init_request, 1148dca51e78SChristoph Hellwig .map_queues = nvme_pci_map_queues, 114957dacad5SJay Sternberg .timeout = nvme_timeout, 1150a0fa9647SJens Axboe .poll = nvme_poll, 115157dacad5SJay Sternberg }; 115257dacad5SJay Sternberg 115357dacad5SJay Sternberg static void nvme_dev_remove_admin(struct nvme_dev *dev) 115457dacad5SJay Sternberg { 11551c63dc66SChristoph Hellwig if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) { 115669d9a99cSKeith Busch /* 115769d9a99cSKeith Busch * If the controller was reset during removal, it's possible 115869d9a99cSKeith Busch * user requests may be waiting on a stopped queue. Start the 115969d9a99cSKeith Busch * queue to flush these to completion. 116069d9a99cSKeith Busch */ 116169d9a99cSKeith Busch blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true); 11621c63dc66SChristoph Hellwig blk_cleanup_queue(dev->ctrl.admin_q); 116357dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 116457dacad5SJay Sternberg } 116557dacad5SJay Sternberg } 116657dacad5SJay Sternberg 116757dacad5SJay Sternberg static int nvme_alloc_admin_tags(struct nvme_dev *dev) 116857dacad5SJay Sternberg { 11691c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q) { 117057dacad5SJay Sternberg dev->admin_tagset.ops = &nvme_mq_admin_ops; 117157dacad5SJay Sternberg dev->admin_tagset.nr_hw_queues = 1; 1172e3e9d50cSKeith Busch 1173e3e9d50cSKeith Busch /* 1174e3e9d50cSKeith Busch * Subtract one to leave an empty queue entry for 'Full Queue' 1175e3e9d50cSKeith Busch * condition. See NVM-Express 1.2 specification, section 4.1.2. 1176e3e9d50cSKeith Busch */ 1177e3e9d50cSKeith Busch dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH - 1; 117857dacad5SJay Sternberg dev->admin_tagset.timeout = ADMIN_TIMEOUT; 117957dacad5SJay Sternberg dev->admin_tagset.numa_node = dev_to_node(dev->dev); 118057dacad5SJay Sternberg dev->admin_tagset.cmd_size = nvme_cmd_size(dev); 1181d3484991SJens Axboe dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; 118257dacad5SJay Sternberg dev->admin_tagset.driver_data = dev; 118357dacad5SJay Sternberg 118457dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->admin_tagset)) 118557dacad5SJay Sternberg return -ENOMEM; 118657dacad5SJay Sternberg 11871c63dc66SChristoph Hellwig dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); 11881c63dc66SChristoph Hellwig if (IS_ERR(dev->ctrl.admin_q)) { 118957dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 119057dacad5SJay Sternberg return -ENOMEM; 119157dacad5SJay Sternberg } 11921c63dc66SChristoph Hellwig if (!blk_get_queue(dev->ctrl.admin_q)) { 119357dacad5SJay Sternberg nvme_dev_remove_admin(dev); 11941c63dc66SChristoph Hellwig dev->ctrl.admin_q = NULL; 119557dacad5SJay Sternberg return -ENODEV; 119657dacad5SJay Sternberg } 119757dacad5SJay Sternberg } else 119825646264SKeith Busch blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true); 119957dacad5SJay Sternberg 120057dacad5SJay Sternberg return 0; 120157dacad5SJay Sternberg } 120257dacad5SJay Sternberg 120357dacad5SJay Sternberg static int nvme_configure_admin_queue(struct nvme_dev *dev) 120457dacad5SJay Sternberg { 120557dacad5SJay Sternberg int result; 120657dacad5SJay Sternberg u32 aqa; 12077a67cbeaSChristoph Hellwig u64 cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 120857dacad5SJay Sternberg struct nvme_queue *nvmeq; 120957dacad5SJay Sternberg 12108ef2074dSGabriel Krisman Bertazi dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1, 0) ? 121157dacad5SJay Sternberg NVME_CAP_NSSRC(cap) : 0; 121257dacad5SJay Sternberg 12137a67cbeaSChristoph Hellwig if (dev->subsystem && 12147a67cbeaSChristoph Hellwig (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO)) 12157a67cbeaSChristoph Hellwig writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS); 121657dacad5SJay Sternberg 12175fd4ce1bSChristoph Hellwig result = nvme_disable_ctrl(&dev->ctrl, cap); 121857dacad5SJay Sternberg if (result < 0) 121957dacad5SJay Sternberg return result; 122057dacad5SJay Sternberg 122157dacad5SJay Sternberg nvmeq = dev->queues[0]; 122257dacad5SJay Sternberg if (!nvmeq) { 122357dacad5SJay Sternberg nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); 122457dacad5SJay Sternberg if (!nvmeq) 122557dacad5SJay Sternberg return -ENOMEM; 122657dacad5SJay Sternberg } 122757dacad5SJay Sternberg 122857dacad5SJay Sternberg aqa = nvmeq->q_depth - 1; 122957dacad5SJay Sternberg aqa |= aqa << 16; 123057dacad5SJay Sternberg 12317a67cbeaSChristoph Hellwig writel(aqa, dev->bar + NVME_REG_AQA); 12327a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ); 12337a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ); 123457dacad5SJay Sternberg 12355fd4ce1bSChristoph Hellwig result = nvme_enable_ctrl(&dev->ctrl, cap); 123657dacad5SJay Sternberg if (result) 1237d4875622SKeith Busch return result; 123857dacad5SJay Sternberg 123957dacad5SJay Sternberg nvmeq->cq_vector = 0; 1240dca51e78SChristoph Hellwig result = queue_request_irq(nvmeq); 124157dacad5SJay Sternberg if (result) { 124257dacad5SJay Sternberg nvmeq->cq_vector = -1; 1243d4875622SKeith Busch return result; 124457dacad5SJay Sternberg } 124557dacad5SJay Sternberg 124657dacad5SJay Sternberg return result; 124757dacad5SJay Sternberg } 124857dacad5SJay Sternberg 1249c875a709SGuilherme G. Piccoli static bool nvme_should_reset(struct nvme_dev *dev, u32 csts) 1250c875a709SGuilherme G. Piccoli { 1251c875a709SGuilherme G. Piccoli 1252c875a709SGuilherme G. Piccoli /* If true, indicates loss of adapter communication, possibly by a 1253c875a709SGuilherme G. Piccoli * NVMe Subsystem reset. 1254c875a709SGuilherme G. Piccoli */ 1255c875a709SGuilherme G. Piccoli bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO); 1256c875a709SGuilherme G. Piccoli 1257c875a709SGuilherme G. Piccoli /* If there is a reset ongoing, we shouldn't reset again. */ 1258c875a709SGuilherme G. Piccoli if (work_busy(&dev->reset_work)) 1259c875a709SGuilherme G. Piccoli return false; 1260c875a709SGuilherme G. Piccoli 1261c875a709SGuilherme G. Piccoli /* We shouldn't reset unless the controller is on fatal error state 1262c875a709SGuilherme G. Piccoli * _or_ if we lost the communication with it. 1263c875a709SGuilherme G. Piccoli */ 1264c875a709SGuilherme G. Piccoli if (!(csts & NVME_CSTS_CFS) && !nssro) 1265c875a709SGuilherme G. Piccoli return false; 1266c875a709SGuilherme G. Piccoli 1267c875a709SGuilherme G. Piccoli /* If PCI error recovery process is happening, we cannot reset or 1268c875a709SGuilherme G. Piccoli * the recovery mechanism will surely fail. 1269c875a709SGuilherme G. Piccoli */ 1270c875a709SGuilherme G. Piccoli if (pci_channel_offline(to_pci_dev(dev->dev))) 1271c875a709SGuilherme G. Piccoli return false; 1272c875a709SGuilherme G. Piccoli 1273c875a709SGuilherme G. Piccoli return true; 1274c875a709SGuilherme G. Piccoli } 1275c875a709SGuilherme G. Piccoli 1276d2a61918SAndy Lutomirski static void nvme_warn_reset(struct nvme_dev *dev, u32 csts) 1277d2a61918SAndy Lutomirski { 1278d2a61918SAndy Lutomirski /* Read a config register to help see what died. */ 1279d2a61918SAndy Lutomirski u16 pci_status; 1280d2a61918SAndy Lutomirski int result; 1281d2a61918SAndy Lutomirski 1282d2a61918SAndy Lutomirski result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS, 1283d2a61918SAndy Lutomirski &pci_status); 1284d2a61918SAndy Lutomirski if (result == PCIBIOS_SUCCESSFUL) 1285d2a61918SAndy Lutomirski dev_warn(dev->dev, 1286d2a61918SAndy Lutomirski "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n", 1287d2a61918SAndy Lutomirski csts, pci_status); 1288d2a61918SAndy Lutomirski else 1289d2a61918SAndy Lutomirski dev_warn(dev->dev, 1290d2a61918SAndy Lutomirski "controller is down; will reset: CSTS=0x%x, PCI_STATUS read failed (%d)\n", 1291d2a61918SAndy Lutomirski csts, result); 1292d2a61918SAndy Lutomirski } 1293d2a61918SAndy Lutomirski 12942d55cd5fSChristoph Hellwig static void nvme_watchdog_timer(unsigned long data) 129557dacad5SJay Sternberg { 12962d55cd5fSChristoph Hellwig struct nvme_dev *dev = (struct nvme_dev *)data; 12977a67cbeaSChristoph Hellwig u32 csts = readl(dev->bar + NVME_REG_CSTS); 129857dacad5SJay Sternberg 1299c875a709SGuilherme G. Piccoli /* Skip controllers under certain specific conditions. */ 1300c875a709SGuilherme G. Piccoli if (nvme_should_reset(dev, csts)) { 1301c5f6ce97SKeith Busch if (!nvme_reset(dev)) 1302d2a61918SAndy Lutomirski nvme_warn_reset(dev, csts); 13032d55cd5fSChristoph Hellwig return; 130457dacad5SJay Sternberg } 130557dacad5SJay Sternberg 13062d55cd5fSChristoph Hellwig mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ)); 130757dacad5SJay Sternberg } 130857dacad5SJay Sternberg 1309749941f2SChristoph Hellwig static int nvme_create_io_queues(struct nvme_dev *dev) 131057dacad5SJay Sternberg { 1311949928c1SKeith Busch unsigned i, max; 1312749941f2SChristoph Hellwig int ret = 0; 131357dacad5SJay Sternberg 1314749941f2SChristoph Hellwig for (i = dev->queue_count; i <= dev->max_qid; i++) { 1315749941f2SChristoph Hellwig if (!nvme_alloc_queue(dev, i, dev->q_depth)) { 1316749941f2SChristoph Hellwig ret = -ENOMEM; 131757dacad5SJay Sternberg break; 1318749941f2SChristoph Hellwig } 1319749941f2SChristoph Hellwig } 132057dacad5SJay Sternberg 1321949928c1SKeith Busch max = min(dev->max_qid, dev->queue_count - 1); 1322949928c1SKeith Busch for (i = dev->online_queues; i <= max; i++) { 1323749941f2SChristoph Hellwig ret = nvme_create_queue(dev->queues[i], i); 1324d4875622SKeith Busch if (ret) 132557dacad5SJay Sternberg break; 132657dacad5SJay Sternberg } 132757dacad5SJay Sternberg 1328749941f2SChristoph Hellwig /* 1329749941f2SChristoph Hellwig * Ignore failing Create SQ/CQ commands, we can continue with less 1330749941f2SChristoph Hellwig * than the desired aount of queues, and even a controller without 1331749941f2SChristoph Hellwig * I/O queues an still be used to issue admin commands. This might 1332749941f2SChristoph Hellwig * be useful to upgrade a buggy firmware for example. 1333749941f2SChristoph Hellwig */ 1334749941f2SChristoph Hellwig return ret >= 0 ? 0 : ret; 133557dacad5SJay Sternberg } 133657dacad5SJay Sternberg 1337202021c1SStephen Bates static ssize_t nvme_cmb_show(struct device *dev, 1338202021c1SStephen Bates struct device_attribute *attr, 1339202021c1SStephen Bates char *buf) 1340202021c1SStephen Bates { 1341202021c1SStephen Bates struct nvme_dev *ndev = to_nvme_dev(dev_get_drvdata(dev)); 1342202021c1SStephen Bates 1343c965809cSStephen Bates return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz : x%08x\n", 1344202021c1SStephen Bates ndev->cmbloc, ndev->cmbsz); 1345202021c1SStephen Bates } 1346202021c1SStephen Bates static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL); 1347202021c1SStephen Bates 134857dacad5SJay Sternberg static void __iomem *nvme_map_cmb(struct nvme_dev *dev) 134957dacad5SJay Sternberg { 135057dacad5SJay Sternberg u64 szu, size, offset; 135157dacad5SJay Sternberg resource_size_t bar_size; 135257dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 135357dacad5SJay Sternberg void __iomem *cmb; 135457dacad5SJay Sternberg dma_addr_t dma_addr; 135557dacad5SJay Sternberg 13567a67cbeaSChristoph Hellwig dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); 135757dacad5SJay Sternberg if (!(NVME_CMB_SZ(dev->cmbsz))) 135857dacad5SJay Sternberg return NULL; 1359202021c1SStephen Bates dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC); 136057dacad5SJay Sternberg 1361202021c1SStephen Bates if (!use_cmb_sqes) 1362202021c1SStephen Bates return NULL; 136357dacad5SJay Sternberg 136457dacad5SJay Sternberg szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); 136557dacad5SJay Sternberg size = szu * NVME_CMB_SZ(dev->cmbsz); 1366202021c1SStephen Bates offset = szu * NVME_CMB_OFST(dev->cmbloc); 1367202021c1SStephen Bates bar_size = pci_resource_len(pdev, NVME_CMB_BIR(dev->cmbloc)); 136857dacad5SJay Sternberg 136957dacad5SJay Sternberg if (offset > bar_size) 137057dacad5SJay Sternberg return NULL; 137157dacad5SJay Sternberg 137257dacad5SJay Sternberg /* 137357dacad5SJay Sternberg * Controllers may support a CMB size larger than their BAR, 137457dacad5SJay Sternberg * for example, due to being behind a bridge. Reduce the CMB to 137557dacad5SJay Sternberg * the reported size of the BAR 137657dacad5SJay Sternberg */ 137757dacad5SJay Sternberg if (size > bar_size - offset) 137857dacad5SJay Sternberg size = bar_size - offset; 137957dacad5SJay Sternberg 1380202021c1SStephen Bates dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(dev->cmbloc)) + offset; 138157dacad5SJay Sternberg cmb = ioremap_wc(dma_addr, size); 138257dacad5SJay Sternberg if (!cmb) 138357dacad5SJay Sternberg return NULL; 138457dacad5SJay Sternberg 138557dacad5SJay Sternberg dev->cmb_dma_addr = dma_addr; 138657dacad5SJay Sternberg dev->cmb_size = size; 138757dacad5SJay Sternberg return cmb; 138857dacad5SJay Sternberg } 138957dacad5SJay Sternberg 139057dacad5SJay Sternberg static inline void nvme_release_cmb(struct nvme_dev *dev) 139157dacad5SJay Sternberg { 139257dacad5SJay Sternberg if (dev->cmb) { 139357dacad5SJay Sternberg iounmap(dev->cmb); 139457dacad5SJay Sternberg dev->cmb = NULL; 139557dacad5SJay Sternberg } 139657dacad5SJay Sternberg } 139757dacad5SJay Sternberg 139857dacad5SJay Sternberg static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) 139957dacad5SJay Sternberg { 140057dacad5SJay Sternberg return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); 140157dacad5SJay Sternberg } 140257dacad5SJay Sternberg 140357dacad5SJay Sternberg static int nvme_setup_io_queues(struct nvme_dev *dev) 140457dacad5SJay Sternberg { 140557dacad5SJay Sternberg struct nvme_queue *adminq = dev->queues[0]; 140657dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 1407dca51e78SChristoph Hellwig int result, nr_io_queues, size; 140857dacad5SJay Sternberg 14092800b8e7SKeith Busch nr_io_queues = num_online_cpus(); 14109a0be7abSChristoph Hellwig result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues); 14119a0be7abSChristoph Hellwig if (result < 0) 141257dacad5SJay Sternberg return result; 14139a0be7abSChristoph Hellwig 1414f5fa90dcSChristoph Hellwig if (nr_io_queues == 0) 1415a5229050SKeith Busch return 0; 141657dacad5SJay Sternberg 141757dacad5SJay Sternberg if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { 141857dacad5SJay Sternberg result = nvme_cmb_qdepth(dev, nr_io_queues, 141957dacad5SJay Sternberg sizeof(struct nvme_command)); 142057dacad5SJay Sternberg if (result > 0) 142157dacad5SJay Sternberg dev->q_depth = result; 142257dacad5SJay Sternberg else 142357dacad5SJay Sternberg nvme_release_cmb(dev); 142457dacad5SJay Sternberg } 142557dacad5SJay Sternberg 142657dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 142757dacad5SJay Sternberg if (size > 8192) { 142857dacad5SJay Sternberg iounmap(dev->bar); 142957dacad5SJay Sternberg do { 143057dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), size); 143157dacad5SJay Sternberg if (dev->bar) 143257dacad5SJay Sternberg break; 143357dacad5SJay Sternberg if (!--nr_io_queues) 143457dacad5SJay Sternberg return -ENOMEM; 143557dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 143657dacad5SJay Sternberg } while (1); 14377a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 143857dacad5SJay Sternberg adminq->q_db = dev->dbs; 143957dacad5SJay Sternberg } 144057dacad5SJay Sternberg 144157dacad5SJay Sternberg /* Deregister the admin queue's interrupt */ 1442dca51e78SChristoph Hellwig free_irq(pci_irq_vector(pdev, 0), adminq); 144357dacad5SJay Sternberg 144457dacad5SJay Sternberg /* 144557dacad5SJay Sternberg * If we enable msix early due to not intx, disable it again before 144657dacad5SJay Sternberg * setting up the full range we need. 144757dacad5SJay Sternberg */ 1448dca51e78SChristoph Hellwig pci_free_irq_vectors(pdev); 1449dca51e78SChristoph Hellwig nr_io_queues = pci_alloc_irq_vectors(pdev, 1, nr_io_queues, 1450dca51e78SChristoph Hellwig PCI_IRQ_ALL_TYPES | PCI_IRQ_AFFINITY); 1451dca51e78SChristoph Hellwig if (nr_io_queues <= 0) 1452dca51e78SChristoph Hellwig return -EIO; 1453dca51e78SChristoph Hellwig dev->max_qid = nr_io_queues; 145457dacad5SJay Sternberg 145557dacad5SJay Sternberg /* 145657dacad5SJay Sternberg * Should investigate if there's a performance win from allocating 145757dacad5SJay Sternberg * more queues than interrupt vectors; it might allow the submission 145857dacad5SJay Sternberg * path to scale better, even if the receive path is limited by the 145957dacad5SJay Sternberg * number of interrupts. 146057dacad5SJay Sternberg */ 146157dacad5SJay Sternberg 1462dca51e78SChristoph Hellwig result = queue_request_irq(adminq); 146357dacad5SJay Sternberg if (result) { 146457dacad5SJay Sternberg adminq->cq_vector = -1; 1465d4875622SKeith Busch return result; 146657dacad5SJay Sternberg } 1467749941f2SChristoph Hellwig return nvme_create_io_queues(dev); 146857dacad5SJay Sternberg } 146957dacad5SJay Sternberg 1470db3cbfffSKeith Busch static void nvme_del_queue_end(struct request *req, int error) 1471db3cbfffSKeith Busch { 1472db3cbfffSKeith Busch struct nvme_queue *nvmeq = req->end_io_data; 1473db3cbfffSKeith Busch 1474db3cbfffSKeith Busch blk_mq_free_request(req); 1475db3cbfffSKeith Busch complete(&nvmeq->dev->ioq_wait); 1476db3cbfffSKeith Busch } 1477db3cbfffSKeith Busch 1478db3cbfffSKeith Busch static void nvme_del_cq_end(struct request *req, int error) 1479db3cbfffSKeith Busch { 1480db3cbfffSKeith Busch struct nvme_queue *nvmeq = req->end_io_data; 1481db3cbfffSKeith Busch 1482db3cbfffSKeith Busch if (!error) { 1483db3cbfffSKeith Busch unsigned long flags; 1484db3cbfffSKeith Busch 14852e39e0f6SMing Lin /* 14862e39e0f6SMing Lin * We might be called with the AQ q_lock held 14872e39e0f6SMing Lin * and the I/O queue q_lock should always 14882e39e0f6SMing Lin * nest inside the AQ one. 14892e39e0f6SMing Lin */ 14902e39e0f6SMing Lin spin_lock_irqsave_nested(&nvmeq->q_lock, flags, 14912e39e0f6SMing Lin SINGLE_DEPTH_NESTING); 1492db3cbfffSKeith Busch nvme_process_cq(nvmeq); 1493db3cbfffSKeith Busch spin_unlock_irqrestore(&nvmeq->q_lock, flags); 1494db3cbfffSKeith Busch } 1495db3cbfffSKeith Busch 1496db3cbfffSKeith Busch nvme_del_queue_end(req, error); 1497db3cbfffSKeith Busch } 1498db3cbfffSKeith Busch 1499db3cbfffSKeith Busch static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode) 1500db3cbfffSKeith Busch { 1501db3cbfffSKeith Busch struct request_queue *q = nvmeq->dev->ctrl.admin_q; 1502db3cbfffSKeith Busch struct request *req; 1503db3cbfffSKeith Busch struct nvme_command cmd; 1504db3cbfffSKeith Busch 1505db3cbfffSKeith Busch memset(&cmd, 0, sizeof(cmd)); 1506db3cbfffSKeith Busch cmd.delete_queue.opcode = opcode; 1507db3cbfffSKeith Busch cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid); 1508db3cbfffSKeith Busch 1509eb71f435SChristoph Hellwig req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY); 1510db3cbfffSKeith Busch if (IS_ERR(req)) 1511db3cbfffSKeith Busch return PTR_ERR(req); 1512db3cbfffSKeith Busch 1513db3cbfffSKeith Busch req->timeout = ADMIN_TIMEOUT; 1514db3cbfffSKeith Busch req->end_io_data = nvmeq; 1515db3cbfffSKeith Busch 1516db3cbfffSKeith Busch blk_execute_rq_nowait(q, NULL, req, false, 1517db3cbfffSKeith Busch opcode == nvme_admin_delete_cq ? 1518db3cbfffSKeith Busch nvme_del_cq_end : nvme_del_queue_end); 1519db3cbfffSKeith Busch return 0; 1520db3cbfffSKeith Busch } 1521db3cbfffSKeith Busch 152270659060SKeith Busch static void nvme_disable_io_queues(struct nvme_dev *dev, int queues) 1523db3cbfffSKeith Busch { 152470659060SKeith Busch int pass; 1525db3cbfffSKeith Busch unsigned long timeout; 1526db3cbfffSKeith Busch u8 opcode = nvme_admin_delete_sq; 1527db3cbfffSKeith Busch 1528db3cbfffSKeith Busch for (pass = 0; pass < 2; pass++) { 1529014a0d60SKeith Busch int sent = 0, i = queues; 1530db3cbfffSKeith Busch 1531db3cbfffSKeith Busch reinit_completion(&dev->ioq_wait); 1532db3cbfffSKeith Busch retry: 1533db3cbfffSKeith Busch timeout = ADMIN_TIMEOUT; 1534c21377f8SGabriel Krisman Bertazi for (; i > 0; i--, sent++) 1535c21377f8SGabriel Krisman Bertazi if (nvme_delete_queue(dev->queues[i], opcode)) 1536db3cbfffSKeith Busch break; 1537c21377f8SGabriel Krisman Bertazi 1538db3cbfffSKeith Busch while (sent--) { 1539db3cbfffSKeith Busch timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout); 1540db3cbfffSKeith Busch if (timeout == 0) 1541db3cbfffSKeith Busch return; 1542db3cbfffSKeith Busch if (i) 1543db3cbfffSKeith Busch goto retry; 1544db3cbfffSKeith Busch } 1545db3cbfffSKeith Busch opcode = nvme_admin_delete_cq; 1546db3cbfffSKeith Busch } 1547db3cbfffSKeith Busch } 1548db3cbfffSKeith Busch 154957dacad5SJay Sternberg /* 155057dacad5SJay Sternberg * Return: error value if an error occurred setting up the queues or calling 155157dacad5SJay Sternberg * Identify Device. 0 if these succeeded, even if adding some of the 155257dacad5SJay Sternberg * namespaces failed. At the moment, these failures are silent. TBD which 155357dacad5SJay Sternberg * failures should be reported. 155457dacad5SJay Sternberg */ 155557dacad5SJay Sternberg static int nvme_dev_add(struct nvme_dev *dev) 155657dacad5SJay Sternberg { 15575bae7f73SChristoph Hellwig if (!dev->ctrl.tagset) { 155857dacad5SJay Sternberg dev->tagset.ops = &nvme_mq_ops; 155957dacad5SJay Sternberg dev->tagset.nr_hw_queues = dev->online_queues - 1; 156057dacad5SJay Sternberg dev->tagset.timeout = NVME_IO_TIMEOUT; 156157dacad5SJay Sternberg dev->tagset.numa_node = dev_to_node(dev->dev); 156257dacad5SJay Sternberg dev->tagset.queue_depth = 156357dacad5SJay Sternberg min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; 156457dacad5SJay Sternberg dev->tagset.cmd_size = nvme_cmd_size(dev); 156557dacad5SJay Sternberg dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; 156657dacad5SJay Sternberg dev->tagset.driver_data = dev; 156757dacad5SJay Sternberg 156857dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->tagset)) 156957dacad5SJay Sternberg return 0; 15705bae7f73SChristoph Hellwig dev->ctrl.tagset = &dev->tagset; 1571949928c1SKeith Busch } else { 1572949928c1SKeith Busch blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1); 1573949928c1SKeith Busch 1574949928c1SKeith Busch /* Free previously allocated queues that are no longer usable */ 1575949928c1SKeith Busch nvme_free_queues(dev, dev->online_queues); 157657dacad5SJay Sternberg } 1577949928c1SKeith Busch 157857dacad5SJay Sternberg return 0; 157957dacad5SJay Sternberg } 158057dacad5SJay Sternberg 1581b00a726aSKeith Busch static int nvme_pci_enable(struct nvme_dev *dev) 158257dacad5SJay Sternberg { 158357dacad5SJay Sternberg u64 cap; 1584b00a726aSKeith Busch int result = -ENOMEM; 158557dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 158657dacad5SJay Sternberg 158757dacad5SJay Sternberg if (pci_enable_device_mem(pdev)) 158857dacad5SJay Sternberg return result; 158957dacad5SJay Sternberg 159057dacad5SJay Sternberg pci_set_master(pdev); 159157dacad5SJay Sternberg 159257dacad5SJay Sternberg if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && 159357dacad5SJay Sternberg dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) 159457dacad5SJay Sternberg goto disable; 159557dacad5SJay Sternberg 15967a67cbeaSChristoph Hellwig if (readl(dev->bar + NVME_REG_CSTS) == -1) { 159757dacad5SJay Sternberg result = -ENODEV; 1598b00a726aSKeith Busch goto disable; 159957dacad5SJay Sternberg } 160057dacad5SJay Sternberg 160157dacad5SJay Sternberg /* 1602a5229050SKeith Busch * Some devices and/or platforms don't advertise or work with INTx 1603a5229050SKeith Busch * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll 1604a5229050SKeith Busch * adjust this later. 160557dacad5SJay Sternberg */ 1606dca51e78SChristoph Hellwig result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); 1607dca51e78SChristoph Hellwig if (result < 0) 1608dca51e78SChristoph Hellwig return result; 160957dacad5SJay Sternberg 16107a67cbeaSChristoph Hellwig cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 16117a67cbeaSChristoph Hellwig 161257dacad5SJay Sternberg dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); 161357dacad5SJay Sternberg dev->db_stride = 1 << NVME_CAP_STRIDE(cap); 16147a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 16151f390c1fSStephan Günther 16161f390c1fSStephan Günther /* 16171f390c1fSStephan Günther * Temporary fix for the Apple controller found in the MacBook8,1 and 16181f390c1fSStephan Günther * some MacBook7,1 to avoid controller resets and data loss. 16191f390c1fSStephan Günther */ 16201f390c1fSStephan Günther if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) { 16211f390c1fSStephan Günther dev->q_depth = 2; 16221f390c1fSStephan Günther dev_warn(dev->dev, "detected Apple NVMe controller, set " 16231f390c1fSStephan Günther "queue depth=%u to work around controller resets\n", 16241f390c1fSStephan Günther dev->q_depth); 16251f390c1fSStephan Günther } 16261f390c1fSStephan Günther 1627202021c1SStephen Bates /* 1628202021c1SStephen Bates * CMBs can currently only exist on >=1.2 PCIe devices. We only 1629202021c1SStephen Bates * populate sysfs if a CMB is implemented. Note that we add the 1630202021c1SStephen Bates * CMB attribute to the nvme_ctrl kobj which removes the need to remove 1631202021c1SStephen Bates * it on exit. Since nvme_dev_attrs_group has no name we can pass 1632202021c1SStephen Bates * NULL as final argument to sysfs_add_file_to_group. 1633202021c1SStephen Bates */ 1634202021c1SStephen Bates 16358ef2074dSGabriel Krisman Bertazi if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2, 0)) { 163657dacad5SJay Sternberg dev->cmb = nvme_map_cmb(dev); 163757dacad5SJay Sternberg 1638202021c1SStephen Bates if (dev->cmbsz) { 1639202021c1SStephen Bates if (sysfs_add_file_to_group(&dev->ctrl.device->kobj, 1640202021c1SStephen Bates &dev_attr_cmb.attr, NULL)) 1641202021c1SStephen Bates dev_warn(dev->dev, 1642202021c1SStephen Bates "failed to add sysfs attribute for CMB\n"); 1643202021c1SStephen Bates } 1644202021c1SStephen Bates } 1645202021c1SStephen Bates 1646a0a3408eSKeith Busch pci_enable_pcie_error_reporting(pdev); 1647a0a3408eSKeith Busch pci_save_state(pdev); 164857dacad5SJay Sternberg return 0; 164957dacad5SJay Sternberg 165057dacad5SJay Sternberg disable: 165157dacad5SJay Sternberg pci_disable_device(pdev); 165257dacad5SJay Sternberg return result; 165357dacad5SJay Sternberg } 165457dacad5SJay Sternberg 165557dacad5SJay Sternberg static void nvme_dev_unmap(struct nvme_dev *dev) 165657dacad5SJay Sternberg { 1657b00a726aSKeith Busch if (dev->bar) 1658b00a726aSKeith Busch iounmap(dev->bar); 1659a1f447b3SJohannes Thumshirn pci_release_mem_regions(to_pci_dev(dev->dev)); 1660b00a726aSKeith Busch } 1661b00a726aSKeith Busch 1662b00a726aSKeith Busch static void nvme_pci_disable(struct nvme_dev *dev) 1663b00a726aSKeith Busch { 166457dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 166557dacad5SJay Sternberg 1666dca51e78SChristoph Hellwig pci_free_irq_vectors(pdev); 166757dacad5SJay Sternberg 1668a0a3408eSKeith Busch if (pci_is_enabled(pdev)) { 1669a0a3408eSKeith Busch pci_disable_pcie_error_reporting(pdev); 167057dacad5SJay Sternberg pci_disable_device(pdev); 167157dacad5SJay Sternberg } 1672a0a3408eSKeith Busch } 167357dacad5SJay Sternberg 1674a5cdb68cSKeith Busch static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown) 167557dacad5SJay Sternberg { 167670659060SKeith Busch int i, queues; 167757dacad5SJay Sternberg u32 csts = -1; 167857dacad5SJay Sternberg 16792d55cd5fSChristoph Hellwig del_timer_sync(&dev->watchdog_timer); 168057dacad5SJay Sternberg 168177bf25eaSKeith Busch mutex_lock(&dev->shutdown_lock); 1682b00a726aSKeith Busch if (pci_is_enabled(to_pci_dev(dev->dev))) { 168325646264SKeith Busch nvme_stop_queues(&dev->ctrl); 16847a67cbeaSChristoph Hellwig csts = readl(dev->bar + NVME_REG_CSTS); 168557dacad5SJay Sternberg } 1686c21377f8SGabriel Krisman Bertazi 168770659060SKeith Busch queues = dev->online_queues - 1; 1688c21377f8SGabriel Krisman Bertazi for (i = dev->queue_count - 1; i > 0; i--) 1689c21377f8SGabriel Krisman Bertazi nvme_suspend_queue(dev->queues[i]); 1690c21377f8SGabriel Krisman Bertazi 169157dacad5SJay Sternberg if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) { 169282469c59SGabriel Krisman Bertazi /* A device might become IO incapable very soon during 169382469c59SGabriel Krisman Bertazi * probe, before the admin queue is configured. Thus, 169482469c59SGabriel Krisman Bertazi * queue_count can be 0 here. 169582469c59SGabriel Krisman Bertazi */ 169682469c59SGabriel Krisman Bertazi if (dev->queue_count) 1697c21377f8SGabriel Krisman Bertazi nvme_suspend_queue(dev->queues[0]); 169857dacad5SJay Sternberg } else { 169970659060SKeith Busch nvme_disable_io_queues(dev, queues); 1700a5cdb68cSKeith Busch nvme_disable_admin_queue(dev, shutdown); 170157dacad5SJay Sternberg } 1702b00a726aSKeith Busch nvme_pci_disable(dev); 170357dacad5SJay Sternberg 1704e1958e65SMing Lin blk_mq_tagset_busy_iter(&dev->tagset, nvme_cancel_request, &dev->ctrl); 1705e1958e65SMing Lin blk_mq_tagset_busy_iter(&dev->admin_tagset, nvme_cancel_request, &dev->ctrl); 170677bf25eaSKeith Busch mutex_unlock(&dev->shutdown_lock); 170757dacad5SJay Sternberg } 170857dacad5SJay Sternberg 170957dacad5SJay Sternberg static int nvme_setup_prp_pools(struct nvme_dev *dev) 171057dacad5SJay Sternberg { 171157dacad5SJay Sternberg dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, 171257dacad5SJay Sternberg PAGE_SIZE, PAGE_SIZE, 0); 171357dacad5SJay Sternberg if (!dev->prp_page_pool) 171457dacad5SJay Sternberg return -ENOMEM; 171557dacad5SJay Sternberg 171657dacad5SJay Sternberg /* Optimisation for I/Os between 4k and 128k */ 171757dacad5SJay Sternberg dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, 171857dacad5SJay Sternberg 256, 256, 0); 171957dacad5SJay Sternberg if (!dev->prp_small_pool) { 172057dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 172157dacad5SJay Sternberg return -ENOMEM; 172257dacad5SJay Sternberg } 172357dacad5SJay Sternberg return 0; 172457dacad5SJay Sternberg } 172557dacad5SJay Sternberg 172657dacad5SJay Sternberg static void nvme_release_prp_pools(struct nvme_dev *dev) 172757dacad5SJay Sternberg { 172857dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 172957dacad5SJay Sternberg dma_pool_destroy(dev->prp_small_pool); 173057dacad5SJay Sternberg } 173157dacad5SJay Sternberg 17321673f1f0SChristoph Hellwig static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) 173357dacad5SJay Sternberg { 17341673f1f0SChristoph Hellwig struct nvme_dev *dev = to_nvme_dev(ctrl); 173557dacad5SJay Sternberg 173657dacad5SJay Sternberg put_device(dev->dev); 173757dacad5SJay Sternberg if (dev->tagset.tags) 173857dacad5SJay Sternberg blk_mq_free_tag_set(&dev->tagset); 17391c63dc66SChristoph Hellwig if (dev->ctrl.admin_q) 17401c63dc66SChristoph Hellwig blk_put_queue(dev->ctrl.admin_q); 174157dacad5SJay Sternberg kfree(dev->queues); 174257dacad5SJay Sternberg kfree(dev); 174357dacad5SJay Sternberg } 174457dacad5SJay Sternberg 1745f58944e2SKeith Busch static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status) 1746f58944e2SKeith Busch { 1747237045fcSLinus Torvalds dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status); 1748f58944e2SKeith Busch 1749f58944e2SKeith Busch kref_get(&dev->ctrl.kref); 175069d9a99cSKeith Busch nvme_dev_disable(dev, false); 1751f58944e2SKeith Busch if (!schedule_work(&dev->remove_work)) 1752f58944e2SKeith Busch nvme_put_ctrl(&dev->ctrl); 1753f58944e2SKeith Busch } 1754f58944e2SKeith Busch 1755fd634f41SChristoph Hellwig static void nvme_reset_work(struct work_struct *work) 175657dacad5SJay Sternberg { 1757fd634f41SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work); 1758f58944e2SKeith Busch int result = -ENODEV; 175957dacad5SJay Sternberg 1760bb8d261eSChristoph Hellwig if (WARN_ON(dev->ctrl.state == NVME_CTRL_RESETTING)) 1761fd634f41SChristoph Hellwig goto out; 1762fd634f41SChristoph Hellwig 1763fd634f41SChristoph Hellwig /* 1764fd634f41SChristoph Hellwig * If we're called to reset a live controller first shut it down before 1765fd634f41SChristoph Hellwig * moving on. 1766fd634f41SChristoph Hellwig */ 1767b00a726aSKeith Busch if (dev->ctrl.ctrl_config & NVME_CC_ENABLE) 1768a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 1769fd634f41SChristoph Hellwig 1770bb8d261eSChristoph Hellwig if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RESETTING)) 17719bf2b972SKeith Busch goto out; 17729bf2b972SKeith Busch 1773b00a726aSKeith Busch result = nvme_pci_enable(dev); 177457dacad5SJay Sternberg if (result) 177557dacad5SJay Sternberg goto out; 177657dacad5SJay Sternberg 177757dacad5SJay Sternberg result = nvme_configure_admin_queue(dev); 177857dacad5SJay Sternberg if (result) 1779f58944e2SKeith Busch goto out; 178057dacad5SJay Sternberg 178157dacad5SJay Sternberg nvme_init_queue(dev->queues[0], 0); 178257dacad5SJay Sternberg result = nvme_alloc_admin_tags(dev); 178357dacad5SJay Sternberg if (result) 1784f58944e2SKeith Busch goto out; 178557dacad5SJay Sternberg 1786ce4541f4SChristoph Hellwig result = nvme_init_identify(&dev->ctrl); 1787ce4541f4SChristoph Hellwig if (result) 1788f58944e2SKeith Busch goto out; 1789ce4541f4SChristoph Hellwig 179057dacad5SJay Sternberg result = nvme_setup_io_queues(dev); 179157dacad5SJay Sternberg if (result) 1792f58944e2SKeith Busch goto out; 179357dacad5SJay Sternberg 179421f033f7SKeith Busch /* 179521f033f7SKeith Busch * A controller that can not execute IO typically requires user 179621f033f7SKeith Busch * intervention to correct. For such degraded controllers, the driver 179721f033f7SKeith Busch * should not submit commands the user did not request, so skip 179821f033f7SKeith Busch * registering for asynchronous event notification on this condition. 179921f033f7SKeith Busch */ 1800f866fc42SChristoph Hellwig if (dev->online_queues > 1) 1801f866fc42SChristoph Hellwig nvme_queue_async_events(&dev->ctrl); 180257dacad5SJay Sternberg 18032d55cd5fSChristoph Hellwig mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ)); 180457dacad5SJay Sternberg 180557dacad5SJay Sternberg /* 180657dacad5SJay Sternberg * Keep the controller around but remove all namespaces if we don't have 180757dacad5SJay Sternberg * any working I/O queue. 180857dacad5SJay Sternberg */ 180957dacad5SJay Sternberg if (dev->online_queues < 2) { 18101b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "IO queues not created\n"); 18113b24774eSKeith Busch nvme_kill_queues(&dev->ctrl); 18125bae7f73SChristoph Hellwig nvme_remove_namespaces(&dev->ctrl); 181357dacad5SJay Sternberg } else { 181425646264SKeith Busch nvme_start_queues(&dev->ctrl); 181557dacad5SJay Sternberg nvme_dev_add(dev); 181657dacad5SJay Sternberg } 181757dacad5SJay Sternberg 1818bb8d261eSChristoph Hellwig if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_LIVE)) { 1819bb8d261eSChristoph Hellwig dev_warn(dev->ctrl.device, "failed to mark controller live\n"); 1820bb8d261eSChristoph Hellwig goto out; 1821bb8d261eSChristoph Hellwig } 182292911a55SChristoph Hellwig 182392911a55SChristoph Hellwig if (dev->online_queues > 1) 18245955be21SChristoph Hellwig nvme_queue_scan(&dev->ctrl); 182557dacad5SJay Sternberg return; 182657dacad5SJay Sternberg 182757dacad5SJay Sternberg out: 1828f58944e2SKeith Busch nvme_remove_dead_ctrl(dev, result); 182957dacad5SJay Sternberg } 183057dacad5SJay Sternberg 18315c8809e6SChristoph Hellwig static void nvme_remove_dead_ctrl_work(struct work_struct *work) 183257dacad5SJay Sternberg { 18335c8809e6SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work); 183457dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 183557dacad5SJay Sternberg 183669d9a99cSKeith Busch nvme_kill_queues(&dev->ctrl); 183757dacad5SJay Sternberg if (pci_get_drvdata(pdev)) 1838921920abSKeith Busch device_release_driver(&pdev->dev); 18391673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 184057dacad5SJay Sternberg } 184157dacad5SJay Sternberg 184257dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev) 184357dacad5SJay Sternberg { 18441c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q || blk_queue_dying(dev->ctrl.admin_q)) 184557dacad5SJay Sternberg return -ENODEV; 1846c5f6ce97SKeith Busch if (work_busy(&dev->reset_work)) 1847c5f6ce97SKeith Busch return -ENODEV; 1848846cc05fSChristoph Hellwig if (!queue_work(nvme_workq, &dev->reset_work)) 1849846cc05fSChristoph Hellwig return -EBUSY; 185057dacad5SJay Sternberg return 0; 185157dacad5SJay Sternberg } 185257dacad5SJay Sternberg 18531c63dc66SChristoph Hellwig static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) 185457dacad5SJay Sternberg { 18551c63dc66SChristoph Hellwig *val = readl(to_nvme_dev(ctrl)->bar + off); 18561c63dc66SChristoph Hellwig return 0; 185757dacad5SJay Sternberg } 18581c63dc66SChristoph Hellwig 18595fd4ce1bSChristoph Hellwig static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) 18605fd4ce1bSChristoph Hellwig { 18615fd4ce1bSChristoph Hellwig writel(val, to_nvme_dev(ctrl)->bar + off); 18625fd4ce1bSChristoph Hellwig return 0; 18635fd4ce1bSChristoph Hellwig } 18645fd4ce1bSChristoph Hellwig 18657fd8930fSChristoph Hellwig static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) 18667fd8930fSChristoph Hellwig { 18677fd8930fSChristoph Hellwig *val = readq(to_nvme_dev(ctrl)->bar + off); 18687fd8930fSChristoph Hellwig return 0; 18697fd8930fSChristoph Hellwig } 18707fd8930fSChristoph Hellwig 1871f3ca80fcSChristoph Hellwig static int nvme_pci_reset_ctrl(struct nvme_ctrl *ctrl) 1872f3ca80fcSChristoph Hellwig { 1873c5f6ce97SKeith Busch struct nvme_dev *dev = to_nvme_dev(ctrl); 1874c5f6ce97SKeith Busch int ret = nvme_reset(dev); 1875c5f6ce97SKeith Busch 1876c5f6ce97SKeith Busch if (!ret) 1877c5f6ce97SKeith Busch flush_work(&dev->reset_work); 1878c5f6ce97SKeith Busch return ret; 1879f3ca80fcSChristoph Hellwig } 1880f3ca80fcSChristoph Hellwig 18811c63dc66SChristoph Hellwig static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { 18821a353d85SMing Lin .name = "pcie", 1883e439bb12SSagi Grimberg .module = THIS_MODULE, 18841c63dc66SChristoph Hellwig .reg_read32 = nvme_pci_reg_read32, 18855fd4ce1bSChristoph Hellwig .reg_write32 = nvme_pci_reg_write32, 18867fd8930fSChristoph Hellwig .reg_read64 = nvme_pci_reg_read64, 1887f3ca80fcSChristoph Hellwig .reset_ctrl = nvme_pci_reset_ctrl, 18881673f1f0SChristoph Hellwig .free_ctrl = nvme_pci_free_ctrl, 1889f866fc42SChristoph Hellwig .submit_async_event = nvme_pci_submit_async_event, 18901c63dc66SChristoph Hellwig }; 189157dacad5SJay Sternberg 1892b00a726aSKeith Busch static int nvme_dev_map(struct nvme_dev *dev) 1893b00a726aSKeith Busch { 1894b00a726aSKeith Busch struct pci_dev *pdev = to_pci_dev(dev->dev); 1895b00a726aSKeith Busch 1896a1f447b3SJohannes Thumshirn if (pci_request_mem_regions(pdev, "nvme")) 1897b00a726aSKeith Busch return -ENODEV; 1898b00a726aSKeith Busch 1899b00a726aSKeith Busch dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); 1900b00a726aSKeith Busch if (!dev->bar) 1901b00a726aSKeith Busch goto release; 1902b00a726aSKeith Busch 1903b00a726aSKeith Busch return 0; 1904b00a726aSKeith Busch release: 1905a1f447b3SJohannes Thumshirn pci_release_mem_regions(pdev); 1906b00a726aSKeith Busch return -ENODEV; 1907b00a726aSKeith Busch } 1908b00a726aSKeith Busch 190957dacad5SJay Sternberg static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 191057dacad5SJay Sternberg { 191157dacad5SJay Sternberg int node, result = -ENOMEM; 191257dacad5SJay Sternberg struct nvme_dev *dev; 191357dacad5SJay Sternberg 191457dacad5SJay Sternberg node = dev_to_node(&pdev->dev); 191557dacad5SJay Sternberg if (node == NUMA_NO_NODE) 19162fa84351SMasayoshi Mizuma set_dev_node(&pdev->dev, first_memory_node); 191757dacad5SJay Sternberg 191857dacad5SJay Sternberg dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); 191957dacad5SJay Sternberg if (!dev) 192057dacad5SJay Sternberg return -ENOMEM; 192157dacad5SJay Sternberg dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), 192257dacad5SJay Sternberg GFP_KERNEL, node); 192357dacad5SJay Sternberg if (!dev->queues) 192457dacad5SJay Sternberg goto free; 192557dacad5SJay Sternberg 192657dacad5SJay Sternberg dev->dev = get_device(&pdev->dev); 192757dacad5SJay Sternberg pci_set_drvdata(pdev, dev); 192857dacad5SJay Sternberg 1929b00a726aSKeith Busch result = nvme_dev_map(dev); 1930b00a726aSKeith Busch if (result) 1931b00a726aSKeith Busch goto free; 1932b00a726aSKeith Busch 1933f3ca80fcSChristoph Hellwig INIT_WORK(&dev->reset_work, nvme_reset_work); 19345c8809e6SChristoph Hellwig INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work); 19352d55cd5fSChristoph Hellwig setup_timer(&dev->watchdog_timer, nvme_watchdog_timer, 19362d55cd5fSChristoph Hellwig (unsigned long)dev); 193777bf25eaSKeith Busch mutex_init(&dev->shutdown_lock); 1938db3cbfffSKeith Busch init_completion(&dev->ioq_wait); 1939f3ca80fcSChristoph Hellwig 1940f3ca80fcSChristoph Hellwig result = nvme_setup_prp_pools(dev); 1941f3ca80fcSChristoph Hellwig if (result) 1942f3ca80fcSChristoph Hellwig goto put_pci; 1943f3ca80fcSChristoph Hellwig 1944f3ca80fcSChristoph Hellwig result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops, 1945f3ca80fcSChristoph Hellwig id->driver_data); 1946f3ca80fcSChristoph Hellwig if (result) 1947f3ca80fcSChristoph Hellwig goto release_pools; 1948f3ca80fcSChristoph Hellwig 19491b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev)); 19501b3c47c1SSagi Grimberg 195192f7a162SKeith Busch queue_work(nvme_workq, &dev->reset_work); 195257dacad5SJay Sternberg return 0; 195357dacad5SJay Sternberg 195457dacad5SJay Sternberg release_pools: 195557dacad5SJay Sternberg nvme_release_prp_pools(dev); 195657dacad5SJay Sternberg put_pci: 195757dacad5SJay Sternberg put_device(dev->dev); 1958b00a726aSKeith Busch nvme_dev_unmap(dev); 195957dacad5SJay Sternberg free: 196057dacad5SJay Sternberg kfree(dev->queues); 196157dacad5SJay Sternberg kfree(dev); 196257dacad5SJay Sternberg return result; 196357dacad5SJay Sternberg } 196457dacad5SJay Sternberg 196557dacad5SJay Sternberg static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) 196657dacad5SJay Sternberg { 196757dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 196857dacad5SJay Sternberg 196957dacad5SJay Sternberg if (prepare) 1970a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 197157dacad5SJay Sternberg else 1972c5f6ce97SKeith Busch nvme_reset(dev); 197357dacad5SJay Sternberg } 197457dacad5SJay Sternberg 197557dacad5SJay Sternberg static void nvme_shutdown(struct pci_dev *pdev) 197657dacad5SJay Sternberg { 197757dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 1978a5cdb68cSKeith Busch nvme_dev_disable(dev, true); 197957dacad5SJay Sternberg } 198057dacad5SJay Sternberg 1981f58944e2SKeith Busch /* 1982f58944e2SKeith Busch * The driver's remove may be called on a device in a partially initialized 1983f58944e2SKeith Busch * state. This function must not have any dependencies on the device state in 1984f58944e2SKeith Busch * order to proceed. 1985f58944e2SKeith Busch */ 198657dacad5SJay Sternberg static void nvme_remove(struct pci_dev *pdev) 198757dacad5SJay Sternberg { 198857dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 198957dacad5SJay Sternberg 1990bb8d261eSChristoph Hellwig nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING); 1991bb8d261eSChristoph Hellwig 199257dacad5SJay Sternberg pci_set_drvdata(pdev, NULL); 19930ff9d4e1SKeith Busch 19940ff9d4e1SKeith Busch if (!pci_device_is_present(pdev)) 19950ff9d4e1SKeith Busch nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD); 19960ff9d4e1SKeith Busch 19979bf2b972SKeith Busch flush_work(&dev->reset_work); 199853029b04SKeith Busch nvme_uninit_ctrl(&dev->ctrl); 1999a5cdb68cSKeith Busch nvme_dev_disable(dev, true); 200057dacad5SJay Sternberg nvme_dev_remove_admin(dev); 200157dacad5SJay Sternberg nvme_free_queues(dev, 0); 200257dacad5SJay Sternberg nvme_release_cmb(dev); 200357dacad5SJay Sternberg nvme_release_prp_pools(dev); 2004b00a726aSKeith Busch nvme_dev_unmap(dev); 20051673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 200657dacad5SJay Sternberg } 200757dacad5SJay Sternberg 200813880f5bSKeith Busch static int nvme_pci_sriov_configure(struct pci_dev *pdev, int numvfs) 200913880f5bSKeith Busch { 201013880f5bSKeith Busch int ret = 0; 201113880f5bSKeith Busch 201213880f5bSKeith Busch if (numvfs == 0) { 201313880f5bSKeith Busch if (pci_vfs_assigned(pdev)) { 201413880f5bSKeith Busch dev_warn(&pdev->dev, 201513880f5bSKeith Busch "Cannot disable SR-IOV VFs while assigned\n"); 201613880f5bSKeith Busch return -EPERM; 201713880f5bSKeith Busch } 201813880f5bSKeith Busch pci_disable_sriov(pdev); 201913880f5bSKeith Busch return 0; 202013880f5bSKeith Busch } 202113880f5bSKeith Busch 202213880f5bSKeith Busch ret = pci_enable_sriov(pdev, numvfs); 202313880f5bSKeith Busch return ret ? ret : numvfs; 202413880f5bSKeith Busch } 202513880f5bSKeith Busch 202657dacad5SJay Sternberg #ifdef CONFIG_PM_SLEEP 202757dacad5SJay Sternberg static int nvme_suspend(struct device *dev) 202857dacad5SJay Sternberg { 202957dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 203057dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 203157dacad5SJay Sternberg 2032a5cdb68cSKeith Busch nvme_dev_disable(ndev, true); 203357dacad5SJay Sternberg return 0; 203457dacad5SJay Sternberg } 203557dacad5SJay Sternberg 203657dacad5SJay Sternberg static int nvme_resume(struct device *dev) 203757dacad5SJay Sternberg { 203857dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 203957dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 204057dacad5SJay Sternberg 2041c5f6ce97SKeith Busch nvme_reset(ndev); 204257dacad5SJay Sternberg return 0; 204357dacad5SJay Sternberg } 204457dacad5SJay Sternberg #endif 204557dacad5SJay Sternberg 204657dacad5SJay Sternberg static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); 204757dacad5SJay Sternberg 2048a0a3408eSKeith Busch static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev, 2049a0a3408eSKeith Busch pci_channel_state_t state) 2050a0a3408eSKeith Busch { 2051a0a3408eSKeith Busch struct nvme_dev *dev = pci_get_drvdata(pdev); 2052a0a3408eSKeith Busch 2053a0a3408eSKeith Busch /* 2054a0a3408eSKeith Busch * A frozen channel requires a reset. When detected, this method will 2055a0a3408eSKeith Busch * shutdown the controller to quiesce. The controller will be restarted 2056a0a3408eSKeith Busch * after the slot reset through driver's slot_reset callback. 2057a0a3408eSKeith Busch */ 2058a0a3408eSKeith Busch switch (state) { 2059a0a3408eSKeith Busch case pci_channel_io_normal: 2060a0a3408eSKeith Busch return PCI_ERS_RESULT_CAN_RECOVER; 2061a0a3408eSKeith Busch case pci_channel_io_frozen: 2062d011fb31SKeith Busch dev_warn(dev->ctrl.device, 2063d011fb31SKeith Busch "frozen state error detected, reset controller\n"); 2064a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 2065a0a3408eSKeith Busch return PCI_ERS_RESULT_NEED_RESET; 2066a0a3408eSKeith Busch case pci_channel_io_perm_failure: 2067d011fb31SKeith Busch dev_warn(dev->ctrl.device, 2068d011fb31SKeith Busch "failure state error detected, request disconnect\n"); 2069a0a3408eSKeith Busch return PCI_ERS_RESULT_DISCONNECT; 2070a0a3408eSKeith Busch } 2071a0a3408eSKeith Busch return PCI_ERS_RESULT_NEED_RESET; 2072a0a3408eSKeith Busch } 2073a0a3408eSKeith Busch 2074a0a3408eSKeith Busch static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev) 2075a0a3408eSKeith Busch { 2076a0a3408eSKeith Busch struct nvme_dev *dev = pci_get_drvdata(pdev); 2077a0a3408eSKeith Busch 20781b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "restart after slot reset\n"); 2079a0a3408eSKeith Busch pci_restore_state(pdev); 2080c5f6ce97SKeith Busch nvme_reset(dev); 2081a0a3408eSKeith Busch return PCI_ERS_RESULT_RECOVERED; 2082a0a3408eSKeith Busch } 2083a0a3408eSKeith Busch 2084a0a3408eSKeith Busch static void nvme_error_resume(struct pci_dev *pdev) 2085a0a3408eSKeith Busch { 2086a0a3408eSKeith Busch pci_cleanup_aer_uncorrect_error_status(pdev); 2087a0a3408eSKeith Busch } 2088a0a3408eSKeith Busch 208957dacad5SJay Sternberg static const struct pci_error_handlers nvme_err_handler = { 209057dacad5SJay Sternberg .error_detected = nvme_error_detected, 209157dacad5SJay Sternberg .slot_reset = nvme_slot_reset, 209257dacad5SJay Sternberg .resume = nvme_error_resume, 209357dacad5SJay Sternberg .reset_notify = nvme_reset_notify, 209457dacad5SJay Sternberg }; 209557dacad5SJay Sternberg 209657dacad5SJay Sternberg static const struct pci_device_id nvme_id_table[] = { 2097106198edSChristoph Hellwig { PCI_VDEVICE(INTEL, 0x0953), 209808095e70SKeith Busch .driver_data = NVME_QUIRK_STRIPE_SIZE | 209908095e70SKeith Busch NVME_QUIRK_DISCARD_ZEROES, }, 210099466e70SKeith Busch { PCI_VDEVICE(INTEL, 0x0a53), 210199466e70SKeith Busch .driver_data = NVME_QUIRK_STRIPE_SIZE | 210299466e70SKeith Busch NVME_QUIRK_DISCARD_ZEROES, }, 210399466e70SKeith Busch { PCI_VDEVICE(INTEL, 0x0a54), 210499466e70SKeith Busch .driver_data = NVME_QUIRK_STRIPE_SIZE | 210599466e70SKeith Busch NVME_QUIRK_DISCARD_ZEROES, }, 2106540c801cSKeith Busch { PCI_VDEVICE(INTEL, 0x5845), /* Qemu emulated controller */ 2107540c801cSKeith Busch .driver_data = NVME_QUIRK_IDENTIFY_CNS, }, 210854adc010SGuilherme G. Piccoli { PCI_DEVICE(0x1c58, 0x0003), /* HGST adapter */ 210954adc010SGuilherme G. Piccoli .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, 2110015282c9SWenbo Wang { PCI_DEVICE(0x1c5f, 0x0540), /* Memblaze Pblaze4 adapter */ 2111015282c9SWenbo Wang .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, }, 211257dacad5SJay Sternberg { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, 2113c74dc780SStephan Günther { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, 211457dacad5SJay Sternberg { 0, } 211557dacad5SJay Sternberg }; 211657dacad5SJay Sternberg MODULE_DEVICE_TABLE(pci, nvme_id_table); 211757dacad5SJay Sternberg 211857dacad5SJay Sternberg static struct pci_driver nvme_driver = { 211957dacad5SJay Sternberg .name = "nvme", 212057dacad5SJay Sternberg .id_table = nvme_id_table, 212157dacad5SJay Sternberg .probe = nvme_probe, 212257dacad5SJay Sternberg .remove = nvme_remove, 212357dacad5SJay Sternberg .shutdown = nvme_shutdown, 212457dacad5SJay Sternberg .driver = { 212557dacad5SJay Sternberg .pm = &nvme_dev_pm_ops, 212657dacad5SJay Sternberg }, 212713880f5bSKeith Busch .sriov_configure = nvme_pci_sriov_configure, 212857dacad5SJay Sternberg .err_handler = &nvme_err_handler, 212957dacad5SJay Sternberg }; 213057dacad5SJay Sternberg 213157dacad5SJay Sternberg static int __init nvme_init(void) 213257dacad5SJay Sternberg { 213357dacad5SJay Sternberg int result; 213457dacad5SJay Sternberg 213592f7a162SKeith Busch nvme_workq = alloc_workqueue("nvme", WQ_UNBOUND | WQ_MEM_RECLAIM, 0); 213657dacad5SJay Sternberg if (!nvme_workq) 213757dacad5SJay Sternberg return -ENOMEM; 213857dacad5SJay Sternberg 213957dacad5SJay Sternberg result = pci_register_driver(&nvme_driver); 214057dacad5SJay Sternberg if (result) 214157dacad5SJay Sternberg destroy_workqueue(nvme_workq); 214257dacad5SJay Sternberg return result; 214357dacad5SJay Sternberg } 214457dacad5SJay Sternberg 214557dacad5SJay Sternberg static void __exit nvme_exit(void) 214657dacad5SJay Sternberg { 214757dacad5SJay Sternberg pci_unregister_driver(&nvme_driver); 214857dacad5SJay Sternberg destroy_workqueue(nvme_workq); 214957dacad5SJay Sternberg _nvme_check_size(); 215057dacad5SJay Sternberg } 215157dacad5SJay Sternberg 215257dacad5SJay Sternberg MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); 215357dacad5SJay Sternberg MODULE_LICENSE("GPL"); 215457dacad5SJay Sternberg MODULE_VERSION("1.0"); 215557dacad5SJay Sternberg module_init(nvme_init); 215657dacad5SJay Sternberg module_exit(nvme_exit); 2157