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> 1957dacad5SJay Sternberg #include <linux/cpu.h> 2057dacad5SJay Sternberg #include <linux/delay.h> 2157dacad5SJay Sternberg #include <linux/errno.h> 2257dacad5SJay Sternberg #include <linux/fs.h> 2357dacad5SJay Sternberg #include <linux/genhd.h> 2457dacad5SJay Sternberg #include <linux/hdreg.h> 2557dacad5SJay Sternberg #include <linux/idr.h> 2657dacad5SJay Sternberg #include <linux/init.h> 2757dacad5SJay Sternberg #include <linux/interrupt.h> 2857dacad5SJay Sternberg #include <linux/io.h> 2957dacad5SJay Sternberg #include <linux/kdev_t.h> 3057dacad5SJay Sternberg #include <linux/kernel.h> 3157dacad5SJay Sternberg #include <linux/mm.h> 3257dacad5SJay Sternberg #include <linux/module.h> 3357dacad5SJay Sternberg #include <linux/moduleparam.h> 3477bf25eaSKeith Busch #include <linux/mutex.h> 3557dacad5SJay Sternberg #include <linux/pci.h> 3657dacad5SJay Sternberg #include <linux/poison.h> 3757dacad5SJay Sternberg #include <linux/ptrace.h> 3857dacad5SJay Sternberg #include <linux/sched.h> 3957dacad5SJay Sternberg #include <linux/slab.h> 4057dacad5SJay Sternberg #include <linux/t10-pi.h> 412d55cd5fSChristoph Hellwig #include <linux/timer.h> 4257dacad5SJay Sternberg #include <linux/types.h> 439cf5c095SLinus Torvalds #include <linux/io-64-nonatomic-lo-hi.h> 441d277a63SKeith Busch #include <asm/unaligned.h> 4557dacad5SJay Sternberg 4657dacad5SJay Sternberg #include "nvme.h" 4757dacad5SJay Sternberg 4857dacad5SJay Sternberg #define NVME_Q_DEPTH 1024 4957dacad5SJay Sternberg #define NVME_AQ_DEPTH 256 5057dacad5SJay Sternberg #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) 5157dacad5SJay Sternberg #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) 5257dacad5SJay Sternberg 53adf68f21SChristoph Hellwig /* 54adf68f21SChristoph Hellwig * We handle AEN commands ourselves and don't even let the 55adf68f21SChristoph Hellwig * block layer know about them. 56adf68f21SChristoph Hellwig */ 57adf68f21SChristoph Hellwig #define NVME_NR_AEN_COMMANDS 1 58adf68f21SChristoph Hellwig #define NVME_AQ_BLKMQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AEN_COMMANDS) 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 struct msix_entry *entry; 931c63dc66SChristoph Hellwig void __iomem *bar; 941c63dc66SChristoph Hellwig struct work_struct reset_work; 951c63dc66SChristoph Hellwig struct work_struct scan_work; 965c8809e6SChristoph Hellwig struct work_struct remove_work; 979396dec9SChristoph Hellwig struct work_struct async_work; 982d55cd5fSChristoph Hellwig struct timer_list watchdog_timer; 9977bf25eaSKeith Busch struct mutex shutdown_lock; 1001c63dc66SChristoph Hellwig bool subsystem; 1011c63dc66SChristoph Hellwig void __iomem *cmb; 1021c63dc66SChristoph Hellwig dma_addr_t cmb_dma_addr; 1031c63dc66SChristoph Hellwig u64 cmb_size; 1041c63dc66SChristoph Hellwig u32 cmbsz; 1051c63dc66SChristoph Hellwig struct nvme_ctrl ctrl; 106db3cbfffSKeith Busch struct completion ioq_wait; 10757dacad5SJay Sternberg }; 10857dacad5SJay Sternberg 1091c63dc66SChristoph Hellwig static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) 1101c63dc66SChristoph Hellwig { 1111c63dc66SChristoph Hellwig return container_of(ctrl, struct nvme_dev, ctrl); 1121c63dc66SChristoph Hellwig } 1131c63dc66SChristoph Hellwig 11457dacad5SJay Sternberg /* 11557dacad5SJay Sternberg * An NVM Express queue. Each device has at least two (one for admin 11657dacad5SJay Sternberg * commands and one for I/O commands). 11757dacad5SJay Sternberg */ 11857dacad5SJay Sternberg struct nvme_queue { 11957dacad5SJay Sternberg struct device *q_dmadev; 12057dacad5SJay Sternberg struct nvme_dev *dev; 12157dacad5SJay Sternberg char irqname[24]; /* nvme4294967295-65535\0 */ 12257dacad5SJay Sternberg spinlock_t q_lock; 12357dacad5SJay Sternberg struct nvme_command *sq_cmds; 12457dacad5SJay Sternberg struct nvme_command __iomem *sq_cmds_io; 12557dacad5SJay Sternberg volatile struct nvme_completion *cqes; 12657dacad5SJay Sternberg struct blk_mq_tags **tags; 12757dacad5SJay Sternberg dma_addr_t sq_dma_addr; 12857dacad5SJay Sternberg dma_addr_t cq_dma_addr; 12957dacad5SJay Sternberg u32 __iomem *q_db; 13057dacad5SJay Sternberg u16 q_depth; 13157dacad5SJay Sternberg s16 cq_vector; 13257dacad5SJay Sternberg u16 sq_tail; 13357dacad5SJay Sternberg u16 cq_head; 13457dacad5SJay Sternberg u16 qid; 13557dacad5SJay Sternberg u8 cq_phase; 13657dacad5SJay Sternberg u8 cqe_seen; 13757dacad5SJay Sternberg }; 13857dacad5SJay Sternberg 13957dacad5SJay Sternberg /* 14071bd150cSChristoph Hellwig * The nvme_iod describes the data in an I/O, including the list of PRP 14171bd150cSChristoph Hellwig * entries. You can't see it in this data structure because C doesn't let 142f4800d6dSChristoph Hellwig * me express that. Use nvme_init_iod to ensure there's enough space 14371bd150cSChristoph Hellwig * allocated to store the PRP list. 14471bd150cSChristoph Hellwig */ 14571bd150cSChristoph Hellwig struct nvme_iod { 146f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq; 147f4800d6dSChristoph Hellwig int aborted; 14871bd150cSChristoph Hellwig int npages; /* In the PRP list. 0 means small pool in use */ 14971bd150cSChristoph Hellwig int nents; /* Used in scatterlist */ 15071bd150cSChristoph Hellwig int length; /* Of data, in bytes */ 15171bd150cSChristoph Hellwig dma_addr_t first_dma; 152bf684057SChristoph Hellwig struct scatterlist meta_sg; /* metadata requires single contiguous buffer */ 153f4800d6dSChristoph Hellwig struct scatterlist *sg; 154f4800d6dSChristoph Hellwig struct scatterlist inline_sg[0]; 15557dacad5SJay Sternberg }; 15657dacad5SJay Sternberg 15757dacad5SJay Sternberg /* 15857dacad5SJay Sternberg * Check we didin't inadvertently grow the command struct 15957dacad5SJay Sternberg */ 16057dacad5SJay Sternberg static inline void _nvme_check_size(void) 16157dacad5SJay Sternberg { 16257dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); 16357dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); 16457dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); 16557dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); 16657dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_features) != 64); 16757dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); 16857dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); 16957dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_command) != 64); 17057dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); 17157dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); 17257dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); 17357dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); 17457dacad5SJay Sternberg } 17557dacad5SJay Sternberg 17657dacad5SJay Sternberg /* 17757dacad5SJay Sternberg * Max size of iod being embedded in the request payload 17857dacad5SJay Sternberg */ 17957dacad5SJay Sternberg #define NVME_INT_PAGES 2 1805fd4ce1bSChristoph Hellwig #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size) 18157dacad5SJay Sternberg 18257dacad5SJay Sternberg /* 18357dacad5SJay Sternberg * Will slightly overestimate the number of pages needed. This is OK 18457dacad5SJay Sternberg * as it only leads to a small amount of wasted memory for the lifetime of 18557dacad5SJay Sternberg * the I/O. 18657dacad5SJay Sternberg */ 18757dacad5SJay Sternberg static int nvme_npages(unsigned size, struct nvme_dev *dev) 18857dacad5SJay Sternberg { 1895fd4ce1bSChristoph Hellwig unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size, 1905fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 19157dacad5SJay Sternberg return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); 19257dacad5SJay Sternberg } 19357dacad5SJay Sternberg 194f4800d6dSChristoph Hellwig static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev, 195f4800d6dSChristoph Hellwig unsigned int size, unsigned int nseg) 196f4800d6dSChristoph Hellwig { 197f4800d6dSChristoph Hellwig return sizeof(__le64 *) * nvme_npages(size, dev) + 198f4800d6dSChristoph Hellwig sizeof(struct scatterlist) * nseg; 199f4800d6dSChristoph Hellwig } 200f4800d6dSChristoph Hellwig 20157dacad5SJay Sternberg static unsigned int nvme_cmd_size(struct nvme_dev *dev) 20257dacad5SJay Sternberg { 203f4800d6dSChristoph Hellwig return sizeof(struct nvme_iod) + 204f4800d6dSChristoph Hellwig nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES); 20557dacad5SJay Sternberg } 20657dacad5SJay Sternberg 20757dacad5SJay Sternberg static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 20857dacad5SJay Sternberg unsigned int hctx_idx) 20957dacad5SJay Sternberg { 21057dacad5SJay Sternberg struct nvme_dev *dev = data; 21157dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 21257dacad5SJay Sternberg 21357dacad5SJay Sternberg WARN_ON(hctx_idx != 0); 21457dacad5SJay Sternberg WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); 21557dacad5SJay Sternberg WARN_ON(nvmeq->tags); 21657dacad5SJay Sternberg 21757dacad5SJay Sternberg hctx->driver_data = nvmeq; 21857dacad5SJay Sternberg nvmeq->tags = &dev->admin_tagset.tags[0]; 21957dacad5SJay Sternberg return 0; 22057dacad5SJay Sternberg } 22157dacad5SJay Sternberg 22257dacad5SJay Sternberg static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) 22357dacad5SJay Sternberg { 22457dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 22557dacad5SJay Sternberg 22657dacad5SJay Sternberg nvmeq->tags = NULL; 22757dacad5SJay Sternberg } 22857dacad5SJay Sternberg 22957dacad5SJay Sternberg static int nvme_admin_init_request(void *data, struct request *req, 23057dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 23157dacad5SJay Sternberg unsigned int numa_node) 23257dacad5SJay Sternberg { 23357dacad5SJay Sternberg struct nvme_dev *dev = data; 234f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 23557dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 23657dacad5SJay Sternberg 23757dacad5SJay Sternberg BUG_ON(!nvmeq); 238f4800d6dSChristoph Hellwig iod->nvmeq = nvmeq; 23957dacad5SJay Sternberg return 0; 24057dacad5SJay Sternberg } 24157dacad5SJay Sternberg 24257dacad5SJay Sternberg static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 24357dacad5SJay Sternberg unsigned int hctx_idx) 24457dacad5SJay Sternberg { 24557dacad5SJay Sternberg struct nvme_dev *dev = data; 24657dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 24757dacad5SJay Sternberg 24857dacad5SJay Sternberg if (!nvmeq->tags) 24957dacad5SJay Sternberg nvmeq->tags = &dev->tagset.tags[hctx_idx]; 25057dacad5SJay Sternberg 25157dacad5SJay Sternberg WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); 25257dacad5SJay Sternberg hctx->driver_data = nvmeq; 25357dacad5SJay Sternberg return 0; 25457dacad5SJay Sternberg } 25557dacad5SJay Sternberg 25657dacad5SJay Sternberg static int nvme_init_request(void *data, struct request *req, 25757dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 25857dacad5SJay Sternberg unsigned int numa_node) 25957dacad5SJay Sternberg { 26057dacad5SJay Sternberg struct nvme_dev *dev = data; 261f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 26257dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 26357dacad5SJay Sternberg 26457dacad5SJay Sternberg BUG_ON(!nvmeq); 265f4800d6dSChristoph Hellwig iod->nvmeq = nvmeq; 26657dacad5SJay Sternberg return 0; 26757dacad5SJay Sternberg } 26857dacad5SJay Sternberg 269646017a6SKeith Busch static void nvme_queue_scan(struct nvme_dev *dev) 270646017a6SKeith Busch { 271646017a6SKeith Busch /* 272646017a6SKeith Busch * Do not queue new scan work when a controller is reset during 273646017a6SKeith Busch * removal. 274646017a6SKeith Busch */ 275*bb8d261eSChristoph Hellwig if (dev->ctrl.state != NVME_CTRL_DELETING) 276646017a6SKeith Busch queue_work(nvme_workq, &dev->scan_work); 277646017a6SKeith Busch } 278646017a6SKeith Busch 279adf68f21SChristoph Hellwig static void nvme_complete_async_event(struct nvme_dev *dev, 28057dacad5SJay Sternberg struct nvme_completion *cqe) 28157dacad5SJay Sternberg { 282adf68f21SChristoph Hellwig u16 status = le16_to_cpu(cqe->status) >> 1; 283adf68f21SChristoph Hellwig u32 result = le32_to_cpu(cqe->result); 28457dacad5SJay Sternberg 2859396dec9SChristoph Hellwig if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) { 286adf68f21SChristoph Hellwig ++dev->ctrl.event_limit; 2879396dec9SChristoph Hellwig queue_work(nvme_workq, &dev->async_work); 2889396dec9SChristoph Hellwig } 2899396dec9SChristoph Hellwig 29057dacad5SJay Sternberg if (status != NVME_SC_SUCCESS) 29157dacad5SJay Sternberg return; 29257dacad5SJay Sternberg 29357dacad5SJay Sternberg switch (result & 0xff07) { 29457dacad5SJay Sternberg case NVME_AER_NOTICE_NS_CHANGED: 2951b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "rescanning\n"); 296646017a6SKeith Busch nvme_queue_scan(dev); 29757dacad5SJay Sternberg default: 2981b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "async event result %08x\n", result); 29957dacad5SJay Sternberg } 30057dacad5SJay Sternberg } 30157dacad5SJay Sternberg 30257dacad5SJay Sternberg /** 303adf68f21SChristoph Hellwig * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell 30457dacad5SJay Sternberg * @nvmeq: The queue to use 30557dacad5SJay Sternberg * @cmd: The command to send 30657dacad5SJay Sternberg * 30757dacad5SJay Sternberg * Safe to use from interrupt context 30857dacad5SJay Sternberg */ 30957dacad5SJay Sternberg static void __nvme_submit_cmd(struct nvme_queue *nvmeq, 31057dacad5SJay Sternberg struct nvme_command *cmd) 31157dacad5SJay Sternberg { 31257dacad5SJay Sternberg u16 tail = nvmeq->sq_tail; 31357dacad5SJay Sternberg 31457dacad5SJay Sternberg if (nvmeq->sq_cmds_io) 31557dacad5SJay Sternberg memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); 31657dacad5SJay Sternberg else 31757dacad5SJay Sternberg memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); 31857dacad5SJay Sternberg 31957dacad5SJay Sternberg if (++tail == nvmeq->q_depth) 32057dacad5SJay Sternberg tail = 0; 32157dacad5SJay Sternberg writel(tail, nvmeq->q_db); 32257dacad5SJay Sternberg nvmeq->sq_tail = tail; 32357dacad5SJay Sternberg } 32457dacad5SJay Sternberg 325f4800d6dSChristoph Hellwig static __le64 **iod_list(struct request *req) 32657dacad5SJay Sternberg { 327f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 328f4800d6dSChristoph Hellwig return (__le64 **)(iod->sg + req->nr_phys_segments); 32957dacad5SJay Sternberg } 33057dacad5SJay Sternberg 33158b45602SMing Lin static int nvme_init_iod(struct request *rq, unsigned size, 33258b45602SMing Lin struct nvme_dev *dev) 33357dacad5SJay Sternberg { 334f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(rq); 335f4800d6dSChristoph Hellwig int nseg = rq->nr_phys_segments; 336f4800d6dSChristoph Hellwig 337f4800d6dSChristoph Hellwig if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { 338f4800d6dSChristoph Hellwig iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC); 339f4800d6dSChristoph Hellwig if (!iod->sg) 340f4800d6dSChristoph Hellwig return BLK_MQ_RQ_QUEUE_BUSY; 341f4800d6dSChristoph Hellwig } else { 342f4800d6dSChristoph Hellwig iod->sg = iod->inline_sg; 34357dacad5SJay Sternberg } 34457dacad5SJay Sternberg 345f4800d6dSChristoph Hellwig iod->aborted = 0; 34657dacad5SJay Sternberg iod->npages = -1; 34757dacad5SJay Sternberg iod->nents = 0; 348f4800d6dSChristoph Hellwig iod->length = size; 349f4800d6dSChristoph Hellwig return 0; 35057dacad5SJay Sternberg } 35157dacad5SJay Sternberg 352f4800d6dSChristoph Hellwig static void nvme_free_iod(struct nvme_dev *dev, struct request *req) 35357dacad5SJay Sternberg { 354f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 3555fd4ce1bSChristoph Hellwig const int last_prp = dev->ctrl.page_size / 8 - 1; 35657dacad5SJay Sternberg int i; 357f4800d6dSChristoph Hellwig __le64 **list = iod_list(req); 35857dacad5SJay Sternberg dma_addr_t prp_dma = iod->first_dma; 35957dacad5SJay Sternberg 36003b5929eSMing Lin if (req->cmd_flags & REQ_DISCARD) 36103b5929eSMing Lin kfree(req->completion_data); 36203b5929eSMing Lin 36357dacad5SJay Sternberg if (iod->npages == 0) 36457dacad5SJay Sternberg dma_pool_free(dev->prp_small_pool, list[0], prp_dma); 36557dacad5SJay Sternberg for (i = 0; i < iod->npages; i++) { 36657dacad5SJay Sternberg __le64 *prp_list = list[i]; 36757dacad5SJay Sternberg dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); 36857dacad5SJay Sternberg dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); 36957dacad5SJay Sternberg prp_dma = next_prp_dma; 37057dacad5SJay Sternberg } 37157dacad5SJay Sternberg 372f4800d6dSChristoph Hellwig if (iod->sg != iod->inline_sg) 373f4800d6dSChristoph Hellwig kfree(iod->sg); 37457dacad5SJay Sternberg } 37557dacad5SJay Sternberg 37657dacad5SJay Sternberg #ifdef CONFIG_BLK_DEV_INTEGRITY 37757dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 37857dacad5SJay Sternberg { 37957dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == v) 38057dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(p); 38157dacad5SJay Sternberg } 38257dacad5SJay Sternberg 38357dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 38457dacad5SJay Sternberg { 38557dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == p) 38657dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(v); 38757dacad5SJay Sternberg } 38857dacad5SJay Sternberg 38957dacad5SJay Sternberg /** 39057dacad5SJay Sternberg * nvme_dif_remap - remaps ref tags to bip seed and physical lba 39157dacad5SJay Sternberg * 39257dacad5SJay Sternberg * The virtual start sector is the one that was originally submitted by the 39357dacad5SJay Sternberg * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical 39457dacad5SJay Sternberg * start sector may be different. Remap protection information to match the 39557dacad5SJay Sternberg * physical LBA on writes, and back to the original seed on reads. 39657dacad5SJay Sternberg * 39757dacad5SJay Sternberg * Type 0 and 3 do not have a ref tag, so no remapping required. 39857dacad5SJay Sternberg */ 39957dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 40057dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 40157dacad5SJay Sternberg { 40257dacad5SJay Sternberg struct nvme_ns *ns = req->rq_disk->private_data; 40357dacad5SJay Sternberg struct bio_integrity_payload *bip; 40457dacad5SJay Sternberg struct t10_pi_tuple *pi; 40557dacad5SJay Sternberg void *p, *pmap; 40657dacad5SJay Sternberg u32 i, nlb, ts, phys, virt; 40757dacad5SJay Sternberg 40857dacad5SJay Sternberg if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) 40957dacad5SJay Sternberg return; 41057dacad5SJay Sternberg 41157dacad5SJay Sternberg bip = bio_integrity(req->bio); 41257dacad5SJay Sternberg if (!bip) 41357dacad5SJay Sternberg return; 41457dacad5SJay Sternberg 41557dacad5SJay Sternberg pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; 41657dacad5SJay Sternberg 41757dacad5SJay Sternberg p = pmap; 41857dacad5SJay Sternberg virt = bip_get_seed(bip); 41957dacad5SJay Sternberg phys = nvme_block_nr(ns, blk_rq_pos(req)); 42057dacad5SJay Sternberg nlb = (blk_rq_bytes(req) >> ns->lba_shift); 421ac6fc48cSDan Williams ts = ns->disk->queue->integrity.tuple_size; 42257dacad5SJay Sternberg 42357dacad5SJay Sternberg for (i = 0; i < nlb; i++, virt++, phys++) { 42457dacad5SJay Sternberg pi = (struct t10_pi_tuple *)p; 42557dacad5SJay Sternberg dif_swap(phys, virt, pi); 42657dacad5SJay Sternberg p += ts; 42757dacad5SJay Sternberg } 42857dacad5SJay Sternberg kunmap_atomic(pmap); 42957dacad5SJay Sternberg } 43057dacad5SJay Sternberg #else /* CONFIG_BLK_DEV_INTEGRITY */ 43157dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 43257dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 43357dacad5SJay Sternberg { 43457dacad5SJay Sternberg } 43557dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 43657dacad5SJay Sternberg { 43757dacad5SJay Sternberg } 43857dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 43957dacad5SJay Sternberg { 44057dacad5SJay Sternberg } 44157dacad5SJay Sternberg #endif 44257dacad5SJay Sternberg 443f4800d6dSChristoph Hellwig static bool nvme_setup_prps(struct nvme_dev *dev, struct request *req, 44469d2b571SChristoph Hellwig int total_len) 44557dacad5SJay Sternberg { 446f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 44757dacad5SJay Sternberg struct dma_pool *pool; 44857dacad5SJay Sternberg int length = total_len; 44957dacad5SJay Sternberg struct scatterlist *sg = iod->sg; 45057dacad5SJay Sternberg int dma_len = sg_dma_len(sg); 45157dacad5SJay Sternberg u64 dma_addr = sg_dma_address(sg); 4525fd4ce1bSChristoph Hellwig u32 page_size = dev->ctrl.page_size; 45357dacad5SJay Sternberg int offset = dma_addr & (page_size - 1); 45457dacad5SJay Sternberg __le64 *prp_list; 455f4800d6dSChristoph Hellwig __le64 **list = iod_list(req); 45657dacad5SJay Sternberg dma_addr_t prp_dma; 45757dacad5SJay Sternberg int nprps, i; 45857dacad5SJay Sternberg 45957dacad5SJay Sternberg length -= (page_size - offset); 46057dacad5SJay Sternberg if (length <= 0) 46169d2b571SChristoph Hellwig return true; 46257dacad5SJay Sternberg 46357dacad5SJay Sternberg dma_len -= (page_size - offset); 46457dacad5SJay Sternberg if (dma_len) { 46557dacad5SJay Sternberg dma_addr += (page_size - offset); 46657dacad5SJay Sternberg } else { 46757dacad5SJay Sternberg sg = sg_next(sg); 46857dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 46957dacad5SJay Sternberg dma_len = sg_dma_len(sg); 47057dacad5SJay Sternberg } 47157dacad5SJay Sternberg 47257dacad5SJay Sternberg if (length <= page_size) { 47357dacad5SJay Sternberg iod->first_dma = dma_addr; 47469d2b571SChristoph Hellwig return true; 47557dacad5SJay Sternberg } 47657dacad5SJay Sternberg 47757dacad5SJay Sternberg nprps = DIV_ROUND_UP(length, page_size); 47857dacad5SJay Sternberg if (nprps <= (256 / 8)) { 47957dacad5SJay Sternberg pool = dev->prp_small_pool; 48057dacad5SJay Sternberg iod->npages = 0; 48157dacad5SJay Sternberg } else { 48257dacad5SJay Sternberg pool = dev->prp_page_pool; 48357dacad5SJay Sternberg iod->npages = 1; 48457dacad5SJay Sternberg } 48557dacad5SJay Sternberg 48669d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 48757dacad5SJay Sternberg if (!prp_list) { 48857dacad5SJay Sternberg iod->first_dma = dma_addr; 48957dacad5SJay Sternberg iod->npages = -1; 49069d2b571SChristoph Hellwig return false; 49157dacad5SJay Sternberg } 49257dacad5SJay Sternberg list[0] = prp_list; 49357dacad5SJay Sternberg iod->first_dma = prp_dma; 49457dacad5SJay Sternberg i = 0; 49557dacad5SJay Sternberg for (;;) { 49657dacad5SJay Sternberg if (i == page_size >> 3) { 49757dacad5SJay Sternberg __le64 *old_prp_list = prp_list; 49869d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 49957dacad5SJay Sternberg if (!prp_list) 50069d2b571SChristoph Hellwig return false; 50157dacad5SJay Sternberg list[iod->npages++] = prp_list; 50257dacad5SJay Sternberg prp_list[0] = old_prp_list[i - 1]; 50357dacad5SJay Sternberg old_prp_list[i - 1] = cpu_to_le64(prp_dma); 50457dacad5SJay Sternberg i = 1; 50557dacad5SJay Sternberg } 50657dacad5SJay Sternberg prp_list[i++] = cpu_to_le64(dma_addr); 50757dacad5SJay Sternberg dma_len -= page_size; 50857dacad5SJay Sternberg dma_addr += page_size; 50957dacad5SJay Sternberg length -= page_size; 51057dacad5SJay Sternberg if (length <= 0) 51157dacad5SJay Sternberg break; 51257dacad5SJay Sternberg if (dma_len > 0) 51357dacad5SJay Sternberg continue; 51457dacad5SJay Sternberg BUG_ON(dma_len < 0); 51557dacad5SJay Sternberg sg = sg_next(sg); 51657dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 51757dacad5SJay Sternberg dma_len = sg_dma_len(sg); 51857dacad5SJay Sternberg } 51957dacad5SJay Sternberg 52069d2b571SChristoph Hellwig return true; 52157dacad5SJay Sternberg } 52257dacad5SJay Sternberg 523f4800d6dSChristoph Hellwig static int nvme_map_data(struct nvme_dev *dev, struct request *req, 52403b5929eSMing Lin unsigned size, struct nvme_command *cmnd) 52557dacad5SJay Sternberg { 526f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 527ba1ca37eSChristoph Hellwig struct request_queue *q = req->q; 528ba1ca37eSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 529ba1ca37eSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 530ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_ERROR; 53157dacad5SJay Sternberg 532ba1ca37eSChristoph Hellwig sg_init_table(iod->sg, req->nr_phys_segments); 533ba1ca37eSChristoph Hellwig iod->nents = blk_rq_map_sg(q, req, iod->sg); 534ba1ca37eSChristoph Hellwig if (!iod->nents) 535ba1ca37eSChristoph Hellwig goto out; 536ba1ca37eSChristoph Hellwig 537ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_BUSY; 538ba1ca37eSChristoph Hellwig if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir)) 539ba1ca37eSChristoph Hellwig goto out; 540ba1ca37eSChristoph Hellwig 54103b5929eSMing Lin if (!nvme_setup_prps(dev, req, size)) 542ba1ca37eSChristoph Hellwig goto out_unmap; 543ba1ca37eSChristoph Hellwig 544ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_ERROR; 545ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) { 546ba1ca37eSChristoph Hellwig if (blk_rq_count_integrity_sg(q, req->bio) != 1) 547ba1ca37eSChristoph Hellwig goto out_unmap; 548ba1ca37eSChristoph Hellwig 549bf684057SChristoph Hellwig sg_init_table(&iod->meta_sg, 1); 550bf684057SChristoph Hellwig if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1) 551ba1ca37eSChristoph Hellwig goto out_unmap; 552ba1ca37eSChristoph Hellwig 553ba1ca37eSChristoph Hellwig if (rq_data_dir(req)) 554ba1ca37eSChristoph Hellwig nvme_dif_remap(req, nvme_dif_prep); 555ba1ca37eSChristoph Hellwig 556bf684057SChristoph Hellwig if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir)) 557ba1ca37eSChristoph Hellwig goto out_unmap; 55857dacad5SJay Sternberg } 55957dacad5SJay Sternberg 560ba1ca37eSChristoph Hellwig cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); 561ba1ca37eSChristoph Hellwig cmnd->rw.prp2 = cpu_to_le64(iod->first_dma); 562ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) 563bf684057SChristoph Hellwig cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); 564ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_OK; 565ba1ca37eSChristoph Hellwig 566ba1ca37eSChristoph Hellwig out_unmap: 567ba1ca37eSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 568ba1ca37eSChristoph Hellwig out: 569ba1ca37eSChristoph Hellwig return ret; 57057dacad5SJay Sternberg } 57157dacad5SJay Sternberg 572f4800d6dSChristoph Hellwig static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) 573d4f6c3abSChristoph Hellwig { 574f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 575d4f6c3abSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 576d4f6c3abSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 577d4f6c3abSChristoph Hellwig 578d4f6c3abSChristoph Hellwig if (iod->nents) { 579d4f6c3abSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 580d4f6c3abSChristoph Hellwig if (blk_integrity_rq(req)) { 581d4f6c3abSChristoph Hellwig if (!rq_data_dir(req)) 582d4f6c3abSChristoph Hellwig nvme_dif_remap(req, nvme_dif_complete); 583bf684057SChristoph Hellwig dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); 584d4f6c3abSChristoph Hellwig } 585d4f6c3abSChristoph Hellwig } 586d4f6c3abSChristoph Hellwig 587f4800d6dSChristoph Hellwig nvme_free_iod(dev, req); 58857dacad5SJay Sternberg } 58957dacad5SJay Sternberg 59057dacad5SJay Sternberg /* 59157dacad5SJay Sternberg * NOTE: ns is NULL when called on the admin queue. 59257dacad5SJay Sternberg */ 59357dacad5SJay Sternberg static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 59457dacad5SJay Sternberg const struct blk_mq_queue_data *bd) 59557dacad5SJay Sternberg { 59657dacad5SJay Sternberg struct nvme_ns *ns = hctx->queue->queuedata; 59757dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 59857dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 59957dacad5SJay Sternberg struct request *req = bd->rq; 600ba1ca37eSChristoph Hellwig struct nvme_command cmnd; 60158b45602SMing Lin unsigned map_len; 602ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_OK; 60357dacad5SJay Sternberg 60457dacad5SJay Sternberg /* 60557dacad5SJay Sternberg * If formated with metadata, require the block layer provide a buffer 60657dacad5SJay Sternberg * unless this namespace is formated such that the metadata can be 60757dacad5SJay Sternberg * stripped/generated by the controller with PRACT=1. 60857dacad5SJay Sternberg */ 60957dacad5SJay Sternberg if (ns && ns->ms && !blk_integrity_rq(req)) { 61057dacad5SJay Sternberg if (!(ns->pi_type && ns->ms == 8) && 61157dacad5SJay Sternberg req->cmd_type != REQ_TYPE_DRV_PRIV) { 612eee417b0SChristoph Hellwig blk_mq_end_request(req, -EFAULT); 61357dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 61457dacad5SJay Sternberg } 61557dacad5SJay Sternberg } 61657dacad5SJay Sternberg 61758b45602SMing Lin map_len = nvme_map_len(req); 61858b45602SMing Lin ret = nvme_init_iod(req, map_len, dev); 619f4800d6dSChristoph Hellwig if (ret) 620f4800d6dSChristoph Hellwig return ret; 62157dacad5SJay Sternberg 6228093f7caSMing Lin ret = nvme_setup_cmd(ns, req, &cmnd); 62303b5929eSMing Lin if (ret) 62403b5929eSMing Lin goto out; 62503b5929eSMing Lin 626ba1ca37eSChristoph Hellwig if (req->nr_phys_segments) 62703b5929eSMing Lin ret = nvme_map_data(dev, req, map_len, &cmnd); 628ba1ca37eSChristoph Hellwig 629ba1ca37eSChristoph Hellwig if (ret) 630ba1ca37eSChristoph Hellwig goto out; 631ba1ca37eSChristoph Hellwig 632ba1ca37eSChristoph Hellwig cmnd.common.command_id = req->tag; 633aae239e1SChristoph Hellwig blk_mq_start_request(req); 634ba1ca37eSChristoph Hellwig 635ba1ca37eSChristoph Hellwig spin_lock_irq(&nvmeq->q_lock); 636ae1fba20SKeith Busch if (unlikely(nvmeq->cq_vector < 0)) { 63769d9a99cSKeith Busch if (ns && !test_bit(NVME_NS_DEAD, &ns->flags)) 638ae1fba20SKeith Busch ret = BLK_MQ_RQ_QUEUE_BUSY; 63969d9a99cSKeith Busch else 64069d9a99cSKeith Busch ret = BLK_MQ_RQ_QUEUE_ERROR; 641ae1fba20SKeith Busch spin_unlock_irq(&nvmeq->q_lock); 642ae1fba20SKeith Busch goto out; 643ae1fba20SKeith Busch } 644ba1ca37eSChristoph Hellwig __nvme_submit_cmd(nvmeq, &cmnd); 64557dacad5SJay Sternberg nvme_process_cq(nvmeq); 64657dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 64757dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 648ba1ca37eSChristoph Hellwig out: 649f4800d6dSChristoph Hellwig nvme_free_iod(dev, req); 650ba1ca37eSChristoph Hellwig return ret; 65157dacad5SJay Sternberg } 65257dacad5SJay Sternberg 653eee417b0SChristoph Hellwig static void nvme_complete_rq(struct request *req) 654eee417b0SChristoph Hellwig { 655f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 656f4800d6dSChristoph Hellwig struct nvme_dev *dev = iod->nvmeq->dev; 657eee417b0SChristoph Hellwig int error = 0; 658eee417b0SChristoph Hellwig 659f4800d6dSChristoph Hellwig nvme_unmap_data(dev, req); 660eee417b0SChristoph Hellwig 661eee417b0SChristoph Hellwig if (unlikely(req->errors)) { 662eee417b0SChristoph Hellwig if (nvme_req_needs_retry(req, req->errors)) { 663eee417b0SChristoph Hellwig nvme_requeue_req(req); 664eee417b0SChristoph Hellwig return; 665eee417b0SChristoph Hellwig } 666eee417b0SChristoph Hellwig 667eee417b0SChristoph Hellwig if (req->cmd_type == REQ_TYPE_DRV_PRIV) 668eee417b0SChristoph Hellwig error = req->errors; 669eee417b0SChristoph Hellwig else 670eee417b0SChristoph Hellwig error = nvme_error_status(req->errors); 671eee417b0SChristoph Hellwig } 672eee417b0SChristoph Hellwig 673f4800d6dSChristoph Hellwig if (unlikely(iod->aborted)) { 6741b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 675eee417b0SChristoph Hellwig "completing aborted command with status: %04x\n", 676eee417b0SChristoph Hellwig req->errors); 677eee417b0SChristoph Hellwig } 678eee417b0SChristoph Hellwig 679eee417b0SChristoph Hellwig blk_mq_end_request(req, error); 68057dacad5SJay Sternberg } 68157dacad5SJay Sternberg 682d783e0bdSMarta Rybczynska /* We read the CQE phase first to check if the rest of the entry is valid */ 683d783e0bdSMarta Rybczynska static inline bool nvme_cqe_valid(struct nvme_queue *nvmeq, u16 head, 684d783e0bdSMarta Rybczynska u16 phase) 685d783e0bdSMarta Rybczynska { 686d783e0bdSMarta Rybczynska return (le16_to_cpu(nvmeq->cqes[head].status) & 1) == phase; 687d783e0bdSMarta Rybczynska } 688d783e0bdSMarta Rybczynska 689a0fa9647SJens Axboe static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag) 69057dacad5SJay Sternberg { 69157dacad5SJay Sternberg u16 head, phase; 69257dacad5SJay Sternberg 69357dacad5SJay Sternberg head = nvmeq->cq_head; 69457dacad5SJay Sternberg phase = nvmeq->cq_phase; 69557dacad5SJay Sternberg 696d783e0bdSMarta Rybczynska while (nvme_cqe_valid(nvmeq, head, phase)) { 69757dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[head]; 698eee417b0SChristoph Hellwig struct request *req; 699adf68f21SChristoph Hellwig 70057dacad5SJay Sternberg if (++head == nvmeq->q_depth) { 70157dacad5SJay Sternberg head = 0; 70257dacad5SJay Sternberg phase = !phase; 70357dacad5SJay Sternberg } 704adf68f21SChristoph Hellwig 705a0fa9647SJens Axboe if (tag && *tag == cqe.command_id) 706a0fa9647SJens Axboe *tag = -1; 707adf68f21SChristoph Hellwig 708aae239e1SChristoph Hellwig if (unlikely(cqe.command_id >= nvmeq->q_depth)) { 7091b3c47c1SSagi Grimberg dev_warn(nvmeq->dev->ctrl.device, 710aae239e1SChristoph Hellwig "invalid id %d completed on queue %d\n", 711aae239e1SChristoph Hellwig cqe.command_id, le16_to_cpu(cqe.sq_id)); 712aae239e1SChristoph Hellwig continue; 713aae239e1SChristoph Hellwig } 714aae239e1SChristoph Hellwig 715adf68f21SChristoph Hellwig /* 716adf68f21SChristoph Hellwig * AEN requests are special as they don't time out and can 717adf68f21SChristoph Hellwig * survive any kind of queue freeze and often don't respond to 718adf68f21SChristoph Hellwig * aborts. We don't even bother to allocate a struct request 719adf68f21SChristoph Hellwig * for them but rather special case them here. 720adf68f21SChristoph Hellwig */ 721adf68f21SChristoph Hellwig if (unlikely(nvmeq->qid == 0 && 722adf68f21SChristoph Hellwig cqe.command_id >= NVME_AQ_BLKMQ_DEPTH)) { 723adf68f21SChristoph Hellwig nvme_complete_async_event(nvmeq->dev, &cqe); 724adf68f21SChristoph Hellwig continue; 725adf68f21SChristoph Hellwig } 726adf68f21SChristoph Hellwig 727eee417b0SChristoph Hellwig req = blk_mq_tag_to_rq(*nvmeq->tags, cqe.command_id); 7281cb3cce5SChristoph Hellwig if (req->cmd_type == REQ_TYPE_DRV_PRIV && req->special) 7291cb3cce5SChristoph Hellwig memcpy(req->special, &cqe, sizeof(cqe)); 730d783e0bdSMarta Rybczynska blk_mq_complete_request(req, le16_to_cpu(cqe.status) >> 1); 731eee417b0SChristoph Hellwig 73257dacad5SJay Sternberg } 73357dacad5SJay Sternberg 73457dacad5SJay Sternberg /* If the controller ignores the cq head doorbell and continuously 73557dacad5SJay Sternberg * writes to the queue, it is theoretically possible to wrap around 73657dacad5SJay Sternberg * the queue twice and mistakenly return IRQ_NONE. Linux only 73757dacad5SJay Sternberg * requires that 0.1% of your interrupts are handled, so this isn't 73857dacad5SJay Sternberg * a big problem. 73957dacad5SJay Sternberg */ 74057dacad5SJay Sternberg if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) 741a0fa9647SJens Axboe return; 74257dacad5SJay Sternberg 743604e8c8dSKeith Busch if (likely(nvmeq->cq_vector >= 0)) 74457dacad5SJay Sternberg writel(head, nvmeq->q_db + nvmeq->dev->db_stride); 74557dacad5SJay Sternberg nvmeq->cq_head = head; 74657dacad5SJay Sternberg nvmeq->cq_phase = phase; 74757dacad5SJay Sternberg 74857dacad5SJay Sternberg nvmeq->cqe_seen = 1; 749a0fa9647SJens Axboe } 750a0fa9647SJens Axboe 751a0fa9647SJens Axboe static void nvme_process_cq(struct nvme_queue *nvmeq) 752a0fa9647SJens Axboe { 753a0fa9647SJens Axboe __nvme_process_cq(nvmeq, NULL); 75457dacad5SJay Sternberg } 75557dacad5SJay Sternberg 75657dacad5SJay Sternberg static irqreturn_t nvme_irq(int irq, void *data) 75757dacad5SJay Sternberg { 75857dacad5SJay Sternberg irqreturn_t result; 75957dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 76057dacad5SJay Sternberg spin_lock(&nvmeq->q_lock); 76157dacad5SJay Sternberg nvme_process_cq(nvmeq); 76257dacad5SJay Sternberg result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; 76357dacad5SJay Sternberg nvmeq->cqe_seen = 0; 76457dacad5SJay Sternberg spin_unlock(&nvmeq->q_lock); 76557dacad5SJay Sternberg return result; 76657dacad5SJay Sternberg } 76757dacad5SJay Sternberg 76857dacad5SJay Sternberg static irqreturn_t nvme_irq_check(int irq, void *data) 76957dacad5SJay Sternberg { 77057dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 771d783e0bdSMarta Rybczynska if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) 77257dacad5SJay Sternberg return IRQ_WAKE_THREAD; 773d783e0bdSMarta Rybczynska return IRQ_NONE; 77457dacad5SJay Sternberg } 77557dacad5SJay Sternberg 776a0fa9647SJens Axboe static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) 777a0fa9647SJens Axboe { 778a0fa9647SJens Axboe struct nvme_queue *nvmeq = hctx->driver_data; 779a0fa9647SJens Axboe 780d783e0bdSMarta Rybczynska if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) { 781a0fa9647SJens Axboe spin_lock_irq(&nvmeq->q_lock); 782a0fa9647SJens Axboe __nvme_process_cq(nvmeq, &tag); 783a0fa9647SJens Axboe spin_unlock_irq(&nvmeq->q_lock); 784a0fa9647SJens Axboe 785a0fa9647SJens Axboe if (tag == -1) 786a0fa9647SJens Axboe return 1; 787a0fa9647SJens Axboe } 788a0fa9647SJens Axboe 789a0fa9647SJens Axboe return 0; 790a0fa9647SJens Axboe } 791a0fa9647SJens Axboe 7929396dec9SChristoph Hellwig static void nvme_async_event_work(struct work_struct *work) 79357dacad5SJay Sternberg { 7949396dec9SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, async_work); 7959396dec9SChristoph Hellwig struct nvme_queue *nvmeq = dev->queues[0]; 79657dacad5SJay Sternberg struct nvme_command c; 79757dacad5SJay Sternberg 79857dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 79957dacad5SJay Sternberg c.common.opcode = nvme_admin_async_event; 80057dacad5SJay Sternberg 8019396dec9SChristoph Hellwig spin_lock_irq(&nvmeq->q_lock); 8029396dec9SChristoph Hellwig while (dev->ctrl.event_limit > 0) { 8039396dec9SChristoph Hellwig c.common.command_id = NVME_AQ_BLKMQ_DEPTH + 8049396dec9SChristoph Hellwig --dev->ctrl.event_limit; 8059396dec9SChristoph Hellwig __nvme_submit_cmd(nvmeq, &c); 8069396dec9SChristoph Hellwig } 8079396dec9SChristoph Hellwig spin_unlock_irq(&nvmeq->q_lock); 80857dacad5SJay Sternberg } 80957dacad5SJay Sternberg 81057dacad5SJay Sternberg static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) 81157dacad5SJay Sternberg { 81257dacad5SJay Sternberg struct nvme_command c; 81357dacad5SJay Sternberg 81457dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 81557dacad5SJay Sternberg c.delete_queue.opcode = opcode; 81657dacad5SJay Sternberg c.delete_queue.qid = cpu_to_le16(id); 81757dacad5SJay Sternberg 8181c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 81957dacad5SJay Sternberg } 82057dacad5SJay Sternberg 82157dacad5SJay Sternberg static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, 82257dacad5SJay Sternberg struct nvme_queue *nvmeq) 82357dacad5SJay Sternberg { 82457dacad5SJay Sternberg struct nvme_command c; 82557dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; 82657dacad5SJay Sternberg 82757dacad5SJay Sternberg /* 82857dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 82957dacad5SJay Sternberg * is attached to the request. 83057dacad5SJay Sternberg */ 83157dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 83257dacad5SJay Sternberg c.create_cq.opcode = nvme_admin_create_cq; 83357dacad5SJay Sternberg c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); 83457dacad5SJay Sternberg c.create_cq.cqid = cpu_to_le16(qid); 83557dacad5SJay Sternberg c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 83657dacad5SJay Sternberg c.create_cq.cq_flags = cpu_to_le16(flags); 83757dacad5SJay Sternberg c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); 83857dacad5SJay Sternberg 8391c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 84057dacad5SJay Sternberg } 84157dacad5SJay Sternberg 84257dacad5SJay Sternberg static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, 84357dacad5SJay Sternberg struct nvme_queue *nvmeq) 84457dacad5SJay Sternberg { 84557dacad5SJay Sternberg struct nvme_command c; 84657dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; 84757dacad5SJay Sternberg 84857dacad5SJay Sternberg /* 84957dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 85057dacad5SJay Sternberg * is attached to the request. 85157dacad5SJay Sternberg */ 85257dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 85357dacad5SJay Sternberg c.create_sq.opcode = nvme_admin_create_sq; 85457dacad5SJay Sternberg c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); 85557dacad5SJay Sternberg c.create_sq.sqid = cpu_to_le16(qid); 85657dacad5SJay Sternberg c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 85757dacad5SJay Sternberg c.create_sq.sq_flags = cpu_to_le16(flags); 85857dacad5SJay Sternberg c.create_sq.cqid = cpu_to_le16(qid); 85957dacad5SJay Sternberg 8601c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 86157dacad5SJay Sternberg } 86257dacad5SJay Sternberg 86357dacad5SJay Sternberg static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) 86457dacad5SJay Sternberg { 86557dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); 86657dacad5SJay Sternberg } 86757dacad5SJay Sternberg 86857dacad5SJay Sternberg static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) 86957dacad5SJay Sternberg { 87057dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); 87157dacad5SJay Sternberg } 87257dacad5SJay Sternberg 873e7a2a87dSChristoph Hellwig static void abort_endio(struct request *req, int error) 87457dacad5SJay Sternberg { 875f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 876f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq = iod->nvmeq; 877e7a2a87dSChristoph Hellwig u16 status = req->errors; 87857dacad5SJay Sternberg 8791cb3cce5SChristoph Hellwig dev_warn(nvmeq->dev->ctrl.device, "Abort status: 0x%x", status); 880e7a2a87dSChristoph Hellwig atomic_inc(&nvmeq->dev->ctrl.abort_limit); 881e7a2a87dSChristoph Hellwig blk_mq_free_request(req); 88257dacad5SJay Sternberg } 88357dacad5SJay Sternberg 88431c7c7d2SChristoph Hellwig static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) 88557dacad5SJay Sternberg { 886f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 887f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq = iod->nvmeq; 88857dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 88957dacad5SJay Sternberg struct request *abort_req; 89057dacad5SJay Sternberg struct nvme_command cmd; 89157dacad5SJay Sternberg 89231c7c7d2SChristoph Hellwig /* 893fd634f41SChristoph Hellwig * Shutdown immediately if controller times out while starting. The 894fd634f41SChristoph Hellwig * reset work will see the pci device disabled when it gets the forced 895fd634f41SChristoph Hellwig * cancellation error. All outstanding requests are completed on 896fd634f41SChristoph Hellwig * shutdown, so we return BLK_EH_HANDLED. 897fd634f41SChristoph Hellwig */ 898*bb8d261eSChristoph Hellwig if (dev->ctrl.state == NVME_CTRL_RESETTING) { 8991b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 900fd634f41SChristoph Hellwig "I/O %d QID %d timeout, disable controller\n", 901fd634f41SChristoph Hellwig req->tag, nvmeq->qid); 902a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 903fd634f41SChristoph Hellwig req->errors = NVME_SC_CANCELLED; 904fd634f41SChristoph Hellwig return BLK_EH_HANDLED; 905fd634f41SChristoph Hellwig } 906fd634f41SChristoph Hellwig 907fd634f41SChristoph Hellwig /* 908e1569a16SKeith Busch * Shutdown the controller immediately and schedule a reset if the 909e1569a16SKeith Busch * command was already aborted once before and still hasn't been 910e1569a16SKeith Busch * returned to the driver, or if this is the admin queue. 91131c7c7d2SChristoph Hellwig */ 912f4800d6dSChristoph Hellwig if (!nvmeq->qid || iod->aborted) { 9131b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 91457dacad5SJay Sternberg "I/O %d QID %d timeout, reset controller\n", 91557dacad5SJay Sternberg req->tag, nvmeq->qid); 916a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 917e1569a16SKeith Busch queue_work(nvme_workq, &dev->reset_work); 918e1569a16SKeith Busch 919e1569a16SKeith Busch /* 920e1569a16SKeith Busch * Mark the request as handled, since the inline shutdown 921e1569a16SKeith Busch * forces all outstanding requests to complete. 922e1569a16SKeith Busch */ 923e1569a16SKeith Busch req->errors = NVME_SC_CANCELLED; 924e1569a16SKeith Busch return BLK_EH_HANDLED; 92557dacad5SJay Sternberg } 92657dacad5SJay Sternberg 927f4800d6dSChristoph Hellwig iod->aborted = 1; 92857dacad5SJay Sternberg 929e7a2a87dSChristoph Hellwig if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) { 930e7a2a87dSChristoph Hellwig atomic_inc(&dev->ctrl.abort_limit); 931e7a2a87dSChristoph Hellwig return BLK_EH_RESET_TIMER; 932e7a2a87dSChristoph Hellwig } 93357dacad5SJay Sternberg 93457dacad5SJay Sternberg memset(&cmd, 0, sizeof(cmd)); 93557dacad5SJay Sternberg cmd.abort.opcode = nvme_admin_abort_cmd; 93657dacad5SJay Sternberg cmd.abort.cid = req->tag; 93757dacad5SJay Sternberg cmd.abort.sqid = cpu_to_le16(nvmeq->qid); 93857dacad5SJay Sternberg 9391b3c47c1SSagi Grimberg dev_warn(nvmeq->dev->ctrl.device, 9401b3c47c1SSagi Grimberg "I/O %d QID %d timeout, aborting\n", 94157dacad5SJay Sternberg req->tag, nvmeq->qid); 942e7a2a87dSChristoph Hellwig 943e7a2a87dSChristoph Hellwig abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd, 9446f3b0e8bSChristoph Hellwig BLK_MQ_REQ_NOWAIT); 9456bf25d16SChristoph Hellwig if (IS_ERR(abort_req)) { 9466bf25d16SChristoph Hellwig atomic_inc(&dev->ctrl.abort_limit); 94731c7c7d2SChristoph Hellwig return BLK_EH_RESET_TIMER; 94857dacad5SJay Sternberg } 94957dacad5SJay Sternberg 950e7a2a87dSChristoph Hellwig abort_req->timeout = ADMIN_TIMEOUT; 951e7a2a87dSChristoph Hellwig abort_req->end_io_data = NULL; 952e7a2a87dSChristoph Hellwig blk_execute_rq_nowait(abort_req->q, NULL, abort_req, 0, abort_endio); 95357dacad5SJay Sternberg 95457dacad5SJay Sternberg /* 95557dacad5SJay Sternberg * The aborted req will be completed on receiving the abort req. 95657dacad5SJay Sternberg * We enable the timer again. If hit twice, it'll cause a device reset, 95757dacad5SJay Sternberg * as the device then is in a faulty state. 95857dacad5SJay Sternberg */ 95957dacad5SJay Sternberg return BLK_EH_RESET_TIMER; 96057dacad5SJay Sternberg } 96157dacad5SJay Sternberg 96282b4552bSSagi Grimberg static void nvme_cancel_io(struct request *req, void *data, bool reserved) 96357dacad5SJay Sternberg { 964aae239e1SChristoph Hellwig int status; 96557dacad5SJay Sternberg 96657dacad5SJay Sternberg if (!blk_mq_request_started(req)) 96757dacad5SJay Sternberg return; 96857dacad5SJay Sternberg 9697e197930SJens Axboe dev_dbg_ratelimited(((struct nvme_dev *) data)->ctrl.device, 9707e197930SJens Axboe "Cancelling I/O %d", req->tag); 97157dacad5SJay Sternberg 9721d49c38cSKeith Busch status = NVME_SC_ABORT_REQ; 97357dacad5SJay Sternberg if (blk_queue_dying(req->q)) 974aae239e1SChristoph Hellwig status |= NVME_SC_DNR; 975aae239e1SChristoph Hellwig blk_mq_complete_request(req, status); 97657dacad5SJay Sternberg } 97757dacad5SJay Sternberg 97857dacad5SJay Sternberg static void nvme_free_queue(struct nvme_queue *nvmeq) 97957dacad5SJay Sternberg { 98057dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), 98157dacad5SJay Sternberg (void *)nvmeq->cqes, nvmeq->cq_dma_addr); 98257dacad5SJay Sternberg if (nvmeq->sq_cmds) 98357dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), 98457dacad5SJay Sternberg nvmeq->sq_cmds, nvmeq->sq_dma_addr); 98557dacad5SJay Sternberg kfree(nvmeq); 98657dacad5SJay Sternberg } 98757dacad5SJay Sternberg 98857dacad5SJay Sternberg static void nvme_free_queues(struct nvme_dev *dev, int lowest) 98957dacad5SJay Sternberg { 99057dacad5SJay Sternberg int i; 99157dacad5SJay Sternberg 99257dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= lowest; i--) { 99357dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 99457dacad5SJay Sternberg dev->queue_count--; 99557dacad5SJay Sternberg dev->queues[i] = NULL; 99657dacad5SJay Sternberg nvme_free_queue(nvmeq); 99757dacad5SJay Sternberg } 99857dacad5SJay Sternberg } 99957dacad5SJay Sternberg 100057dacad5SJay Sternberg /** 100157dacad5SJay Sternberg * nvme_suspend_queue - put queue into suspended state 100257dacad5SJay Sternberg * @nvmeq - queue to suspend 100357dacad5SJay Sternberg */ 100457dacad5SJay Sternberg static int nvme_suspend_queue(struct nvme_queue *nvmeq) 100557dacad5SJay Sternberg { 100657dacad5SJay Sternberg int vector; 100757dacad5SJay Sternberg 100857dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 100957dacad5SJay Sternberg if (nvmeq->cq_vector == -1) { 101057dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 101157dacad5SJay Sternberg return 1; 101257dacad5SJay Sternberg } 101357dacad5SJay Sternberg vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; 101457dacad5SJay Sternberg nvmeq->dev->online_queues--; 101557dacad5SJay Sternberg nvmeq->cq_vector = -1; 101657dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 101757dacad5SJay Sternberg 10181c63dc66SChristoph Hellwig if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) 101925646264SKeith Busch blk_mq_stop_hw_queues(nvmeq->dev->ctrl.admin_q); 102057dacad5SJay Sternberg 102157dacad5SJay Sternberg irq_set_affinity_hint(vector, NULL); 102257dacad5SJay Sternberg free_irq(vector, nvmeq); 102357dacad5SJay Sternberg 102457dacad5SJay Sternberg return 0; 102557dacad5SJay Sternberg } 102657dacad5SJay Sternberg 1027a5cdb68cSKeith Busch static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown) 102857dacad5SJay Sternberg { 1029a5cdb68cSKeith Busch struct nvme_queue *nvmeq = dev->queues[0]; 103057dacad5SJay Sternberg 103157dacad5SJay Sternberg if (!nvmeq) 103257dacad5SJay Sternberg return; 103357dacad5SJay Sternberg if (nvme_suspend_queue(nvmeq)) 103457dacad5SJay Sternberg return; 103557dacad5SJay Sternberg 1036a5cdb68cSKeith Busch if (shutdown) 1037a5cdb68cSKeith Busch nvme_shutdown_ctrl(&dev->ctrl); 1038a5cdb68cSKeith Busch else 1039a5cdb68cSKeith Busch nvme_disable_ctrl(&dev->ctrl, lo_hi_readq( 1040a5cdb68cSKeith Busch dev->bar + NVME_REG_CAP)); 104157dacad5SJay Sternberg 104257dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 104357dacad5SJay Sternberg nvme_process_cq(nvmeq); 104457dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 104557dacad5SJay Sternberg } 104657dacad5SJay Sternberg 104757dacad5SJay Sternberg static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, 104857dacad5SJay Sternberg int entry_size) 104957dacad5SJay Sternberg { 105057dacad5SJay Sternberg int q_depth = dev->q_depth; 10515fd4ce1bSChristoph Hellwig unsigned q_size_aligned = roundup(q_depth * entry_size, 10525fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 105357dacad5SJay Sternberg 105457dacad5SJay Sternberg if (q_size_aligned * nr_io_queues > dev->cmb_size) { 105557dacad5SJay Sternberg u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); 10565fd4ce1bSChristoph Hellwig mem_per_q = round_down(mem_per_q, dev->ctrl.page_size); 105757dacad5SJay Sternberg q_depth = div_u64(mem_per_q, entry_size); 105857dacad5SJay Sternberg 105957dacad5SJay Sternberg /* 106057dacad5SJay Sternberg * Ensure the reduced q_depth is above some threshold where it 106157dacad5SJay Sternberg * would be better to map queues in system memory with the 106257dacad5SJay Sternberg * original depth 106357dacad5SJay Sternberg */ 106457dacad5SJay Sternberg if (q_depth < 64) 106557dacad5SJay Sternberg return -ENOMEM; 106657dacad5SJay Sternberg } 106757dacad5SJay Sternberg 106857dacad5SJay Sternberg return q_depth; 106957dacad5SJay Sternberg } 107057dacad5SJay Sternberg 107157dacad5SJay Sternberg static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, 107257dacad5SJay Sternberg int qid, int depth) 107357dacad5SJay Sternberg { 107457dacad5SJay Sternberg if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { 10755fd4ce1bSChristoph Hellwig unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth), 10765fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 107757dacad5SJay Sternberg nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; 107857dacad5SJay Sternberg nvmeq->sq_cmds_io = dev->cmb + offset; 107957dacad5SJay Sternberg } else { 108057dacad5SJay Sternberg nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), 108157dacad5SJay Sternberg &nvmeq->sq_dma_addr, GFP_KERNEL); 108257dacad5SJay Sternberg if (!nvmeq->sq_cmds) 108357dacad5SJay Sternberg return -ENOMEM; 108457dacad5SJay Sternberg } 108557dacad5SJay Sternberg 108657dacad5SJay Sternberg return 0; 108757dacad5SJay Sternberg } 108857dacad5SJay Sternberg 108957dacad5SJay Sternberg static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, 109057dacad5SJay Sternberg int depth) 109157dacad5SJay Sternberg { 109257dacad5SJay Sternberg struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL); 109357dacad5SJay Sternberg if (!nvmeq) 109457dacad5SJay Sternberg return NULL; 109557dacad5SJay Sternberg 109657dacad5SJay Sternberg nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), 109757dacad5SJay Sternberg &nvmeq->cq_dma_addr, GFP_KERNEL); 109857dacad5SJay Sternberg if (!nvmeq->cqes) 109957dacad5SJay Sternberg goto free_nvmeq; 110057dacad5SJay Sternberg 110157dacad5SJay Sternberg if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) 110257dacad5SJay Sternberg goto free_cqdma; 110357dacad5SJay Sternberg 110457dacad5SJay Sternberg nvmeq->q_dmadev = dev->dev; 110557dacad5SJay Sternberg nvmeq->dev = dev; 110657dacad5SJay Sternberg snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", 11071c63dc66SChristoph Hellwig dev->ctrl.instance, qid); 110857dacad5SJay Sternberg spin_lock_init(&nvmeq->q_lock); 110957dacad5SJay Sternberg nvmeq->cq_head = 0; 111057dacad5SJay Sternberg nvmeq->cq_phase = 1; 111157dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 111257dacad5SJay Sternberg nvmeq->q_depth = depth; 111357dacad5SJay Sternberg nvmeq->qid = qid; 111457dacad5SJay Sternberg nvmeq->cq_vector = -1; 111557dacad5SJay Sternberg dev->queues[qid] = nvmeq; 111657dacad5SJay Sternberg dev->queue_count++; 111757dacad5SJay Sternberg 111857dacad5SJay Sternberg return nvmeq; 111957dacad5SJay Sternberg 112057dacad5SJay Sternberg free_cqdma: 112157dacad5SJay Sternberg dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, 112257dacad5SJay Sternberg nvmeq->cq_dma_addr); 112357dacad5SJay Sternberg free_nvmeq: 112457dacad5SJay Sternberg kfree(nvmeq); 112557dacad5SJay Sternberg return NULL; 112657dacad5SJay Sternberg } 112757dacad5SJay Sternberg 112857dacad5SJay Sternberg static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, 112957dacad5SJay Sternberg const char *name) 113057dacad5SJay Sternberg { 113157dacad5SJay Sternberg if (use_threaded_interrupts) 113257dacad5SJay Sternberg return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, 113357dacad5SJay Sternberg nvme_irq_check, nvme_irq, IRQF_SHARED, 113457dacad5SJay Sternberg name, nvmeq); 113557dacad5SJay Sternberg return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, 113657dacad5SJay Sternberg IRQF_SHARED, name, nvmeq); 113757dacad5SJay Sternberg } 113857dacad5SJay Sternberg 113957dacad5SJay Sternberg static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) 114057dacad5SJay Sternberg { 114157dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 114257dacad5SJay Sternberg 114357dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 114457dacad5SJay Sternberg nvmeq->sq_tail = 0; 114557dacad5SJay Sternberg nvmeq->cq_head = 0; 114657dacad5SJay Sternberg nvmeq->cq_phase = 1; 114757dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 114857dacad5SJay Sternberg memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); 114957dacad5SJay Sternberg dev->online_queues++; 115057dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 115157dacad5SJay Sternberg } 115257dacad5SJay Sternberg 115357dacad5SJay Sternberg static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) 115457dacad5SJay Sternberg { 115557dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 115657dacad5SJay Sternberg int result; 115757dacad5SJay Sternberg 115857dacad5SJay Sternberg nvmeq->cq_vector = qid - 1; 115957dacad5SJay Sternberg result = adapter_alloc_cq(dev, qid, nvmeq); 116057dacad5SJay Sternberg if (result < 0) 116157dacad5SJay Sternberg return result; 116257dacad5SJay Sternberg 116357dacad5SJay Sternberg result = adapter_alloc_sq(dev, qid, nvmeq); 116457dacad5SJay Sternberg if (result < 0) 116557dacad5SJay Sternberg goto release_cq; 116657dacad5SJay Sternberg 116757dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 116857dacad5SJay Sternberg if (result < 0) 116957dacad5SJay Sternberg goto release_sq; 117057dacad5SJay Sternberg 117157dacad5SJay Sternberg nvme_init_queue(nvmeq, qid); 117257dacad5SJay Sternberg return result; 117357dacad5SJay Sternberg 117457dacad5SJay Sternberg release_sq: 117557dacad5SJay Sternberg adapter_delete_sq(dev, qid); 117657dacad5SJay Sternberg release_cq: 117757dacad5SJay Sternberg adapter_delete_cq(dev, qid); 117857dacad5SJay Sternberg return result; 117957dacad5SJay Sternberg } 118057dacad5SJay Sternberg 118157dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_admin_ops = { 118257dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 1183eee417b0SChristoph Hellwig .complete = nvme_complete_rq, 118457dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 118557dacad5SJay Sternberg .init_hctx = nvme_admin_init_hctx, 118657dacad5SJay Sternberg .exit_hctx = nvme_admin_exit_hctx, 118757dacad5SJay Sternberg .init_request = nvme_admin_init_request, 118857dacad5SJay Sternberg .timeout = nvme_timeout, 118957dacad5SJay Sternberg }; 119057dacad5SJay Sternberg 119157dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_ops = { 119257dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 1193eee417b0SChristoph Hellwig .complete = nvme_complete_rq, 119457dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 119557dacad5SJay Sternberg .init_hctx = nvme_init_hctx, 119657dacad5SJay Sternberg .init_request = nvme_init_request, 119757dacad5SJay Sternberg .timeout = nvme_timeout, 1198a0fa9647SJens Axboe .poll = nvme_poll, 119957dacad5SJay Sternberg }; 120057dacad5SJay Sternberg 120157dacad5SJay Sternberg static void nvme_dev_remove_admin(struct nvme_dev *dev) 120257dacad5SJay Sternberg { 12031c63dc66SChristoph Hellwig if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) { 120469d9a99cSKeith Busch /* 120569d9a99cSKeith Busch * If the controller was reset during removal, it's possible 120669d9a99cSKeith Busch * user requests may be waiting on a stopped queue. Start the 120769d9a99cSKeith Busch * queue to flush these to completion. 120869d9a99cSKeith Busch */ 120969d9a99cSKeith Busch blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true); 12101c63dc66SChristoph Hellwig blk_cleanup_queue(dev->ctrl.admin_q); 121157dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 121257dacad5SJay Sternberg } 121357dacad5SJay Sternberg } 121457dacad5SJay Sternberg 121557dacad5SJay Sternberg static int nvme_alloc_admin_tags(struct nvme_dev *dev) 121657dacad5SJay Sternberg { 12171c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q) { 121857dacad5SJay Sternberg dev->admin_tagset.ops = &nvme_mq_admin_ops; 121957dacad5SJay Sternberg dev->admin_tagset.nr_hw_queues = 1; 1220e3e9d50cSKeith Busch 1221e3e9d50cSKeith Busch /* 1222e3e9d50cSKeith Busch * Subtract one to leave an empty queue entry for 'Full Queue' 1223e3e9d50cSKeith Busch * condition. See NVM-Express 1.2 specification, section 4.1.2. 1224e3e9d50cSKeith Busch */ 1225e3e9d50cSKeith Busch dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH - 1; 122657dacad5SJay Sternberg dev->admin_tagset.timeout = ADMIN_TIMEOUT; 122757dacad5SJay Sternberg dev->admin_tagset.numa_node = dev_to_node(dev->dev); 122857dacad5SJay Sternberg dev->admin_tagset.cmd_size = nvme_cmd_size(dev); 122957dacad5SJay Sternberg dev->admin_tagset.driver_data = dev; 123057dacad5SJay Sternberg 123157dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->admin_tagset)) 123257dacad5SJay Sternberg return -ENOMEM; 123357dacad5SJay Sternberg 12341c63dc66SChristoph Hellwig dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); 12351c63dc66SChristoph Hellwig if (IS_ERR(dev->ctrl.admin_q)) { 123657dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 123757dacad5SJay Sternberg return -ENOMEM; 123857dacad5SJay Sternberg } 12391c63dc66SChristoph Hellwig if (!blk_get_queue(dev->ctrl.admin_q)) { 124057dacad5SJay Sternberg nvme_dev_remove_admin(dev); 12411c63dc66SChristoph Hellwig dev->ctrl.admin_q = NULL; 124257dacad5SJay Sternberg return -ENODEV; 124357dacad5SJay Sternberg } 124457dacad5SJay Sternberg } else 124525646264SKeith Busch blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true); 124657dacad5SJay Sternberg 124757dacad5SJay Sternberg return 0; 124857dacad5SJay Sternberg } 124957dacad5SJay Sternberg 125057dacad5SJay Sternberg static int nvme_configure_admin_queue(struct nvme_dev *dev) 125157dacad5SJay Sternberg { 125257dacad5SJay Sternberg int result; 125357dacad5SJay Sternberg u32 aqa; 12547a67cbeaSChristoph Hellwig u64 cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 125557dacad5SJay Sternberg struct nvme_queue *nvmeq; 125657dacad5SJay Sternberg 12577a67cbeaSChristoph Hellwig dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1) ? 125857dacad5SJay Sternberg NVME_CAP_NSSRC(cap) : 0; 125957dacad5SJay Sternberg 12607a67cbeaSChristoph Hellwig if (dev->subsystem && 12617a67cbeaSChristoph Hellwig (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO)) 12627a67cbeaSChristoph Hellwig writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS); 126357dacad5SJay Sternberg 12645fd4ce1bSChristoph Hellwig result = nvme_disable_ctrl(&dev->ctrl, cap); 126557dacad5SJay Sternberg if (result < 0) 126657dacad5SJay Sternberg return result; 126757dacad5SJay Sternberg 126857dacad5SJay Sternberg nvmeq = dev->queues[0]; 126957dacad5SJay Sternberg if (!nvmeq) { 127057dacad5SJay Sternberg nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); 127157dacad5SJay Sternberg if (!nvmeq) 127257dacad5SJay Sternberg return -ENOMEM; 127357dacad5SJay Sternberg } 127457dacad5SJay Sternberg 127557dacad5SJay Sternberg aqa = nvmeq->q_depth - 1; 127657dacad5SJay Sternberg aqa |= aqa << 16; 127757dacad5SJay Sternberg 12787a67cbeaSChristoph Hellwig writel(aqa, dev->bar + NVME_REG_AQA); 12797a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ); 12807a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ); 128157dacad5SJay Sternberg 12825fd4ce1bSChristoph Hellwig result = nvme_enable_ctrl(&dev->ctrl, cap); 128357dacad5SJay Sternberg if (result) 128457dacad5SJay Sternberg goto free_nvmeq; 128557dacad5SJay Sternberg 128657dacad5SJay Sternberg nvmeq->cq_vector = 0; 128757dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 128857dacad5SJay Sternberg if (result) { 128957dacad5SJay Sternberg nvmeq->cq_vector = -1; 129057dacad5SJay Sternberg goto free_nvmeq; 129157dacad5SJay Sternberg } 129257dacad5SJay Sternberg 129357dacad5SJay Sternberg return result; 129457dacad5SJay Sternberg 129557dacad5SJay Sternberg free_nvmeq: 129657dacad5SJay Sternberg nvme_free_queues(dev, 0); 129757dacad5SJay Sternberg return result; 129857dacad5SJay Sternberg } 129957dacad5SJay Sternberg 1300c875a709SGuilherme G. Piccoli static bool nvme_should_reset(struct nvme_dev *dev, u32 csts) 1301c875a709SGuilherme G. Piccoli { 1302c875a709SGuilherme G. Piccoli 1303c875a709SGuilherme G. Piccoli /* If true, indicates loss of adapter communication, possibly by a 1304c875a709SGuilherme G. Piccoli * NVMe Subsystem reset. 1305c875a709SGuilherme G. Piccoli */ 1306c875a709SGuilherme G. Piccoli bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO); 1307c875a709SGuilherme G. Piccoli 1308c875a709SGuilherme G. Piccoli /* If there is a reset ongoing, we shouldn't reset again. */ 1309c875a709SGuilherme G. Piccoli if (work_busy(&dev->reset_work)) 1310c875a709SGuilherme G. Piccoli return false; 1311c875a709SGuilherme G. Piccoli 1312c875a709SGuilherme G. Piccoli /* We shouldn't reset unless the controller is on fatal error state 1313c875a709SGuilherme G. Piccoli * _or_ if we lost the communication with it. 1314c875a709SGuilherme G. Piccoli */ 1315c875a709SGuilherme G. Piccoli if (!(csts & NVME_CSTS_CFS) && !nssro) 1316c875a709SGuilherme G. Piccoli return false; 1317c875a709SGuilherme G. Piccoli 1318c875a709SGuilherme G. Piccoli /* If PCI error recovery process is happening, we cannot reset or 1319c875a709SGuilherme G. Piccoli * the recovery mechanism will surely fail. 1320c875a709SGuilherme G. Piccoli */ 1321c875a709SGuilherme G. Piccoli if (pci_channel_offline(to_pci_dev(dev->dev))) 1322c875a709SGuilherme G. Piccoli return false; 1323c875a709SGuilherme G. Piccoli 1324c875a709SGuilherme G. Piccoli return true; 1325c875a709SGuilherme G. Piccoli } 1326c875a709SGuilherme G. Piccoli 13272d55cd5fSChristoph Hellwig static void nvme_watchdog_timer(unsigned long data) 132857dacad5SJay Sternberg { 13292d55cd5fSChristoph Hellwig struct nvme_dev *dev = (struct nvme_dev *)data; 13307a67cbeaSChristoph Hellwig u32 csts = readl(dev->bar + NVME_REG_CSTS); 133157dacad5SJay Sternberg 1332c875a709SGuilherme G. Piccoli /* Skip controllers under certain specific conditions. */ 1333c875a709SGuilherme G. Piccoli if (nvme_should_reset(dev, csts)) { 1334c875a709SGuilherme G. Piccoli if (queue_work(nvme_workq, &dev->reset_work)) 133557dacad5SJay Sternberg dev_warn(dev->dev, 13362d55cd5fSChristoph Hellwig "Failed status: 0x%x, reset controller.\n", 13372d55cd5fSChristoph Hellwig csts); 13382d55cd5fSChristoph Hellwig return; 133957dacad5SJay Sternberg } 134057dacad5SJay Sternberg 13412d55cd5fSChristoph Hellwig mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ)); 134257dacad5SJay Sternberg } 134357dacad5SJay Sternberg 1344749941f2SChristoph Hellwig static int nvme_create_io_queues(struct nvme_dev *dev) 134557dacad5SJay Sternberg { 1346949928c1SKeith Busch unsigned i, max; 1347749941f2SChristoph Hellwig int ret = 0; 134857dacad5SJay Sternberg 1349749941f2SChristoph Hellwig for (i = dev->queue_count; i <= dev->max_qid; i++) { 1350749941f2SChristoph Hellwig if (!nvme_alloc_queue(dev, i, dev->q_depth)) { 1351749941f2SChristoph Hellwig ret = -ENOMEM; 135257dacad5SJay Sternberg break; 1353749941f2SChristoph Hellwig } 1354749941f2SChristoph Hellwig } 135557dacad5SJay Sternberg 1356949928c1SKeith Busch max = min(dev->max_qid, dev->queue_count - 1); 1357949928c1SKeith Busch for (i = dev->online_queues; i <= max; i++) { 1358749941f2SChristoph Hellwig ret = nvme_create_queue(dev->queues[i], i); 1359749941f2SChristoph Hellwig if (ret) { 136057dacad5SJay Sternberg nvme_free_queues(dev, i); 136157dacad5SJay Sternberg break; 136257dacad5SJay Sternberg } 136357dacad5SJay Sternberg } 136457dacad5SJay Sternberg 1365749941f2SChristoph Hellwig /* 1366749941f2SChristoph Hellwig * Ignore failing Create SQ/CQ commands, we can continue with less 1367749941f2SChristoph Hellwig * than the desired aount of queues, and even a controller without 1368749941f2SChristoph Hellwig * I/O queues an still be used to issue admin commands. This might 1369749941f2SChristoph Hellwig * be useful to upgrade a buggy firmware for example. 1370749941f2SChristoph Hellwig */ 1371749941f2SChristoph Hellwig return ret >= 0 ? 0 : ret; 137257dacad5SJay Sternberg } 137357dacad5SJay Sternberg 137457dacad5SJay Sternberg static void __iomem *nvme_map_cmb(struct nvme_dev *dev) 137557dacad5SJay Sternberg { 137657dacad5SJay Sternberg u64 szu, size, offset; 137757dacad5SJay Sternberg u32 cmbloc; 137857dacad5SJay Sternberg resource_size_t bar_size; 137957dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 138057dacad5SJay Sternberg void __iomem *cmb; 138157dacad5SJay Sternberg dma_addr_t dma_addr; 138257dacad5SJay Sternberg 138357dacad5SJay Sternberg if (!use_cmb_sqes) 138457dacad5SJay Sternberg return NULL; 138557dacad5SJay Sternberg 13867a67cbeaSChristoph Hellwig dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); 138757dacad5SJay Sternberg if (!(NVME_CMB_SZ(dev->cmbsz))) 138857dacad5SJay Sternberg return NULL; 138957dacad5SJay Sternberg 13907a67cbeaSChristoph Hellwig cmbloc = readl(dev->bar + NVME_REG_CMBLOC); 139157dacad5SJay Sternberg 139257dacad5SJay Sternberg szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); 139357dacad5SJay Sternberg size = szu * NVME_CMB_SZ(dev->cmbsz); 139457dacad5SJay Sternberg offset = szu * NVME_CMB_OFST(cmbloc); 139557dacad5SJay Sternberg bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc)); 139657dacad5SJay Sternberg 139757dacad5SJay Sternberg if (offset > bar_size) 139857dacad5SJay Sternberg return NULL; 139957dacad5SJay Sternberg 140057dacad5SJay Sternberg /* 140157dacad5SJay Sternberg * Controllers may support a CMB size larger than their BAR, 140257dacad5SJay Sternberg * for example, due to being behind a bridge. Reduce the CMB to 140357dacad5SJay Sternberg * the reported size of the BAR 140457dacad5SJay Sternberg */ 140557dacad5SJay Sternberg if (size > bar_size - offset) 140657dacad5SJay Sternberg size = bar_size - offset; 140757dacad5SJay Sternberg 140857dacad5SJay Sternberg dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset; 140957dacad5SJay Sternberg cmb = ioremap_wc(dma_addr, size); 141057dacad5SJay Sternberg if (!cmb) 141157dacad5SJay Sternberg return NULL; 141257dacad5SJay Sternberg 141357dacad5SJay Sternberg dev->cmb_dma_addr = dma_addr; 141457dacad5SJay Sternberg dev->cmb_size = size; 141557dacad5SJay Sternberg return cmb; 141657dacad5SJay Sternberg } 141757dacad5SJay Sternberg 141857dacad5SJay Sternberg static inline void nvme_release_cmb(struct nvme_dev *dev) 141957dacad5SJay Sternberg { 142057dacad5SJay Sternberg if (dev->cmb) { 142157dacad5SJay Sternberg iounmap(dev->cmb); 142257dacad5SJay Sternberg dev->cmb = NULL; 142357dacad5SJay Sternberg } 142457dacad5SJay Sternberg } 142557dacad5SJay Sternberg 142657dacad5SJay Sternberg static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) 142757dacad5SJay Sternberg { 142857dacad5SJay Sternberg return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); 142957dacad5SJay Sternberg } 143057dacad5SJay Sternberg 143157dacad5SJay Sternberg static int nvme_setup_io_queues(struct nvme_dev *dev) 143257dacad5SJay Sternberg { 143357dacad5SJay Sternberg struct nvme_queue *adminq = dev->queues[0]; 143457dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 143557dacad5SJay Sternberg int result, i, vecs, nr_io_queues, size; 143657dacad5SJay Sternberg 143757dacad5SJay Sternberg nr_io_queues = num_possible_cpus(); 14389a0be7abSChristoph Hellwig result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues); 14399a0be7abSChristoph Hellwig if (result < 0) 144057dacad5SJay Sternberg return result; 14419a0be7abSChristoph Hellwig 14429a0be7abSChristoph Hellwig /* 14439a0be7abSChristoph Hellwig * Degraded controllers might return an error when setting the queue 14449a0be7abSChristoph Hellwig * count. We still want to be able to bring them online and offer 14459a0be7abSChristoph Hellwig * access to the admin queue, as that might be only way to fix them up. 14469a0be7abSChristoph Hellwig */ 14479a0be7abSChristoph Hellwig if (result > 0) { 14481b3c47c1SSagi Grimberg dev_err(dev->ctrl.device, 14491b3c47c1SSagi Grimberg "Could not set queue count (%d)\n", result); 1450788e15abSKeith Busch return 0; 14519a0be7abSChristoph Hellwig } 145257dacad5SJay Sternberg 145357dacad5SJay Sternberg if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { 145457dacad5SJay Sternberg result = nvme_cmb_qdepth(dev, nr_io_queues, 145557dacad5SJay Sternberg sizeof(struct nvme_command)); 145657dacad5SJay Sternberg if (result > 0) 145757dacad5SJay Sternberg dev->q_depth = result; 145857dacad5SJay Sternberg else 145957dacad5SJay Sternberg nvme_release_cmb(dev); 146057dacad5SJay Sternberg } 146157dacad5SJay Sternberg 146257dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 146357dacad5SJay Sternberg if (size > 8192) { 146457dacad5SJay Sternberg iounmap(dev->bar); 146557dacad5SJay Sternberg do { 146657dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), size); 146757dacad5SJay Sternberg if (dev->bar) 146857dacad5SJay Sternberg break; 146957dacad5SJay Sternberg if (!--nr_io_queues) 147057dacad5SJay Sternberg return -ENOMEM; 147157dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 147257dacad5SJay Sternberg } while (1); 14737a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 147457dacad5SJay Sternberg adminq->q_db = dev->dbs; 147557dacad5SJay Sternberg } 147657dacad5SJay Sternberg 147757dacad5SJay Sternberg /* Deregister the admin queue's interrupt */ 147857dacad5SJay Sternberg free_irq(dev->entry[0].vector, adminq); 147957dacad5SJay Sternberg 148057dacad5SJay Sternberg /* 148157dacad5SJay Sternberg * If we enable msix early due to not intx, disable it again before 148257dacad5SJay Sternberg * setting up the full range we need. 148357dacad5SJay Sternberg */ 1484788e15abSKeith Busch if (pdev->msi_enabled) 1485788e15abSKeith Busch pci_disable_msi(pdev); 1486788e15abSKeith Busch else if (pdev->msix_enabled) 148757dacad5SJay Sternberg pci_disable_msix(pdev); 148857dacad5SJay Sternberg 148957dacad5SJay Sternberg for (i = 0; i < nr_io_queues; i++) 149057dacad5SJay Sternberg dev->entry[i].entry = i; 149157dacad5SJay Sternberg vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); 149257dacad5SJay Sternberg if (vecs < 0) { 149357dacad5SJay Sternberg vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); 149457dacad5SJay Sternberg if (vecs < 0) { 149557dacad5SJay Sternberg vecs = 1; 149657dacad5SJay Sternberg } else { 149757dacad5SJay Sternberg for (i = 0; i < vecs; i++) 149857dacad5SJay Sternberg dev->entry[i].vector = i + pdev->irq; 149957dacad5SJay Sternberg } 150057dacad5SJay Sternberg } 150157dacad5SJay Sternberg 150257dacad5SJay Sternberg /* 150357dacad5SJay Sternberg * Should investigate if there's a performance win from allocating 150457dacad5SJay Sternberg * more queues than interrupt vectors; it might allow the submission 150557dacad5SJay Sternberg * path to scale better, even if the receive path is limited by the 150657dacad5SJay Sternberg * number of interrupts. 150757dacad5SJay Sternberg */ 150857dacad5SJay Sternberg nr_io_queues = vecs; 150957dacad5SJay Sternberg dev->max_qid = nr_io_queues; 151057dacad5SJay Sternberg 151157dacad5SJay Sternberg result = queue_request_irq(dev, adminq, adminq->irqname); 151257dacad5SJay Sternberg if (result) { 151357dacad5SJay Sternberg adminq->cq_vector = -1; 151457dacad5SJay Sternberg goto free_queues; 151557dacad5SJay Sternberg } 1516749941f2SChristoph Hellwig return nvme_create_io_queues(dev); 151757dacad5SJay Sternberg 151857dacad5SJay Sternberg free_queues: 151957dacad5SJay Sternberg nvme_free_queues(dev, 1); 152057dacad5SJay Sternberg return result; 152157dacad5SJay Sternberg } 152257dacad5SJay Sternberg 152357dacad5SJay Sternberg static void nvme_set_irq_hints(struct nvme_dev *dev) 152457dacad5SJay Sternberg { 152557dacad5SJay Sternberg struct nvme_queue *nvmeq; 152657dacad5SJay Sternberg int i; 152757dacad5SJay Sternberg 152857dacad5SJay Sternberg for (i = 0; i < dev->online_queues; i++) { 152957dacad5SJay Sternberg nvmeq = dev->queues[i]; 153057dacad5SJay Sternberg 153157dacad5SJay Sternberg if (!nvmeq->tags || !(*nvmeq->tags)) 153257dacad5SJay Sternberg continue; 153357dacad5SJay Sternberg 153457dacad5SJay Sternberg irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, 153557dacad5SJay Sternberg blk_mq_tags_cpumask(*nvmeq->tags)); 153657dacad5SJay Sternberg } 153757dacad5SJay Sternberg } 153857dacad5SJay Sternberg 153957dacad5SJay Sternberg static void nvme_dev_scan(struct work_struct *work) 154057dacad5SJay Sternberg { 154157dacad5SJay Sternberg struct nvme_dev *dev = container_of(work, struct nvme_dev, scan_work); 154257dacad5SJay Sternberg 154357dacad5SJay Sternberg if (!dev->tagset.tags) 154457dacad5SJay Sternberg return; 15455bae7f73SChristoph Hellwig nvme_scan_namespaces(&dev->ctrl); 154657dacad5SJay Sternberg nvme_set_irq_hints(dev); 154757dacad5SJay Sternberg } 154857dacad5SJay Sternberg 1549db3cbfffSKeith Busch static void nvme_del_queue_end(struct request *req, int error) 1550db3cbfffSKeith Busch { 1551db3cbfffSKeith Busch struct nvme_queue *nvmeq = req->end_io_data; 1552db3cbfffSKeith Busch 1553db3cbfffSKeith Busch blk_mq_free_request(req); 1554db3cbfffSKeith Busch complete(&nvmeq->dev->ioq_wait); 1555db3cbfffSKeith Busch } 1556db3cbfffSKeith Busch 1557db3cbfffSKeith Busch static void nvme_del_cq_end(struct request *req, int error) 1558db3cbfffSKeith Busch { 1559db3cbfffSKeith Busch struct nvme_queue *nvmeq = req->end_io_data; 1560db3cbfffSKeith Busch 1561db3cbfffSKeith Busch if (!error) { 1562db3cbfffSKeith Busch unsigned long flags; 1563db3cbfffSKeith Busch 15642e39e0f6SMing Lin /* 15652e39e0f6SMing Lin * We might be called with the AQ q_lock held 15662e39e0f6SMing Lin * and the I/O queue q_lock should always 15672e39e0f6SMing Lin * nest inside the AQ one. 15682e39e0f6SMing Lin */ 15692e39e0f6SMing Lin spin_lock_irqsave_nested(&nvmeq->q_lock, flags, 15702e39e0f6SMing Lin SINGLE_DEPTH_NESTING); 1571db3cbfffSKeith Busch nvme_process_cq(nvmeq); 1572db3cbfffSKeith Busch spin_unlock_irqrestore(&nvmeq->q_lock, flags); 1573db3cbfffSKeith Busch } 1574db3cbfffSKeith Busch 1575db3cbfffSKeith Busch nvme_del_queue_end(req, error); 1576db3cbfffSKeith Busch } 1577db3cbfffSKeith Busch 1578db3cbfffSKeith Busch static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode) 1579db3cbfffSKeith Busch { 1580db3cbfffSKeith Busch struct request_queue *q = nvmeq->dev->ctrl.admin_q; 1581db3cbfffSKeith Busch struct request *req; 1582db3cbfffSKeith Busch struct nvme_command cmd; 1583db3cbfffSKeith Busch 1584db3cbfffSKeith Busch memset(&cmd, 0, sizeof(cmd)); 1585db3cbfffSKeith Busch cmd.delete_queue.opcode = opcode; 1586db3cbfffSKeith Busch cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid); 1587db3cbfffSKeith Busch 1588db3cbfffSKeith Busch req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT); 1589db3cbfffSKeith Busch if (IS_ERR(req)) 1590db3cbfffSKeith Busch return PTR_ERR(req); 1591db3cbfffSKeith Busch 1592db3cbfffSKeith Busch req->timeout = ADMIN_TIMEOUT; 1593db3cbfffSKeith Busch req->end_io_data = nvmeq; 1594db3cbfffSKeith Busch 1595db3cbfffSKeith Busch blk_execute_rq_nowait(q, NULL, req, false, 1596db3cbfffSKeith Busch opcode == nvme_admin_delete_cq ? 1597db3cbfffSKeith Busch nvme_del_cq_end : nvme_del_queue_end); 1598db3cbfffSKeith Busch return 0; 1599db3cbfffSKeith Busch } 1600db3cbfffSKeith Busch 1601db3cbfffSKeith Busch static void nvme_disable_io_queues(struct nvme_dev *dev) 1602db3cbfffSKeith Busch { 1603db3cbfffSKeith Busch int pass; 1604db3cbfffSKeith Busch unsigned long timeout; 1605db3cbfffSKeith Busch u8 opcode = nvme_admin_delete_sq; 1606db3cbfffSKeith Busch 1607db3cbfffSKeith Busch for (pass = 0; pass < 2; pass++) { 1608db3cbfffSKeith Busch int sent = 0, i = dev->queue_count - 1; 1609db3cbfffSKeith Busch 1610db3cbfffSKeith Busch reinit_completion(&dev->ioq_wait); 1611db3cbfffSKeith Busch retry: 1612db3cbfffSKeith Busch timeout = ADMIN_TIMEOUT; 1613db3cbfffSKeith Busch for (; i > 0; i--) { 1614db3cbfffSKeith Busch struct nvme_queue *nvmeq = dev->queues[i]; 1615db3cbfffSKeith Busch 1616db3cbfffSKeith Busch if (!pass) 1617db3cbfffSKeith Busch nvme_suspend_queue(nvmeq); 1618db3cbfffSKeith Busch if (nvme_delete_queue(nvmeq, opcode)) 1619db3cbfffSKeith Busch break; 1620db3cbfffSKeith Busch ++sent; 1621db3cbfffSKeith Busch } 1622db3cbfffSKeith Busch while (sent--) { 1623db3cbfffSKeith Busch timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout); 1624db3cbfffSKeith Busch if (timeout == 0) 1625db3cbfffSKeith Busch return; 1626db3cbfffSKeith Busch if (i) 1627db3cbfffSKeith Busch goto retry; 1628db3cbfffSKeith Busch } 1629db3cbfffSKeith Busch opcode = nvme_admin_delete_cq; 1630db3cbfffSKeith Busch } 1631db3cbfffSKeith Busch } 1632db3cbfffSKeith Busch 163357dacad5SJay Sternberg /* 163457dacad5SJay Sternberg * Return: error value if an error occurred setting up the queues or calling 163557dacad5SJay Sternberg * Identify Device. 0 if these succeeded, even if adding some of the 163657dacad5SJay Sternberg * namespaces failed. At the moment, these failures are silent. TBD which 163757dacad5SJay Sternberg * failures should be reported. 163857dacad5SJay Sternberg */ 163957dacad5SJay Sternberg static int nvme_dev_add(struct nvme_dev *dev) 164057dacad5SJay Sternberg { 16415bae7f73SChristoph Hellwig if (!dev->ctrl.tagset) { 164257dacad5SJay Sternberg dev->tagset.ops = &nvme_mq_ops; 164357dacad5SJay Sternberg dev->tagset.nr_hw_queues = dev->online_queues - 1; 164457dacad5SJay Sternberg dev->tagset.timeout = NVME_IO_TIMEOUT; 164557dacad5SJay Sternberg dev->tagset.numa_node = dev_to_node(dev->dev); 164657dacad5SJay Sternberg dev->tagset.queue_depth = 164757dacad5SJay Sternberg min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; 164857dacad5SJay Sternberg dev->tagset.cmd_size = nvme_cmd_size(dev); 164957dacad5SJay Sternberg dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; 165057dacad5SJay Sternberg dev->tagset.driver_data = dev; 165157dacad5SJay Sternberg 165257dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->tagset)) 165357dacad5SJay Sternberg return 0; 16545bae7f73SChristoph Hellwig dev->ctrl.tagset = &dev->tagset; 1655949928c1SKeith Busch } else { 1656949928c1SKeith Busch blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1); 1657949928c1SKeith Busch 1658949928c1SKeith Busch /* Free previously allocated queues that are no longer usable */ 1659949928c1SKeith Busch nvme_free_queues(dev, dev->online_queues); 166057dacad5SJay Sternberg } 1661949928c1SKeith Busch 1662646017a6SKeith Busch nvme_queue_scan(dev); 166357dacad5SJay Sternberg return 0; 166457dacad5SJay Sternberg } 166557dacad5SJay Sternberg 1666b00a726aSKeith Busch static int nvme_pci_enable(struct nvme_dev *dev) 166757dacad5SJay Sternberg { 166857dacad5SJay Sternberg u64 cap; 1669b00a726aSKeith Busch int result = -ENOMEM; 167057dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 167157dacad5SJay Sternberg 167257dacad5SJay Sternberg if (pci_enable_device_mem(pdev)) 167357dacad5SJay Sternberg return result; 167457dacad5SJay Sternberg 167557dacad5SJay Sternberg pci_set_master(pdev); 167657dacad5SJay Sternberg 167757dacad5SJay Sternberg if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && 167857dacad5SJay Sternberg dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) 167957dacad5SJay Sternberg goto disable; 168057dacad5SJay Sternberg 16817a67cbeaSChristoph Hellwig if (readl(dev->bar + NVME_REG_CSTS) == -1) { 168257dacad5SJay Sternberg result = -ENODEV; 1683b00a726aSKeith Busch goto disable; 168457dacad5SJay Sternberg } 168557dacad5SJay Sternberg 168657dacad5SJay Sternberg /* 1687788e15abSKeith Busch * Some devices and/or platforms don't advertise or work with INTx 1688788e15abSKeith Busch * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll 1689788e15abSKeith Busch * adjust this later. 169057dacad5SJay Sternberg */ 1691788e15abSKeith Busch if (pci_enable_msix(pdev, dev->entry, 1)) { 1692788e15abSKeith Busch pci_enable_msi(pdev); 1693788e15abSKeith Busch dev->entry[0].vector = pdev->irq; 1694788e15abSKeith Busch } 1695788e15abSKeith Busch 1696788e15abSKeith Busch if (!dev->entry[0].vector) { 1697788e15abSKeith Busch result = -ENODEV; 1698b00a726aSKeith Busch goto disable; 169957dacad5SJay Sternberg } 170057dacad5SJay Sternberg 17017a67cbeaSChristoph Hellwig cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 17027a67cbeaSChristoph Hellwig 170357dacad5SJay Sternberg dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); 170457dacad5SJay Sternberg dev->db_stride = 1 << NVME_CAP_STRIDE(cap); 17057a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 17061f390c1fSStephan Günther 17071f390c1fSStephan Günther /* 17081f390c1fSStephan Günther * Temporary fix for the Apple controller found in the MacBook8,1 and 17091f390c1fSStephan Günther * some MacBook7,1 to avoid controller resets and data loss. 17101f390c1fSStephan Günther */ 17111f390c1fSStephan Günther if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) { 17121f390c1fSStephan Günther dev->q_depth = 2; 17131f390c1fSStephan Günther dev_warn(dev->dev, "detected Apple NVMe controller, set " 17141f390c1fSStephan Günther "queue depth=%u to work around controller resets\n", 17151f390c1fSStephan Günther dev->q_depth); 17161f390c1fSStephan Günther } 17171f390c1fSStephan Günther 17187a67cbeaSChristoph Hellwig if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2)) 171957dacad5SJay Sternberg dev->cmb = nvme_map_cmb(dev); 172057dacad5SJay Sternberg 1721a0a3408eSKeith Busch pci_enable_pcie_error_reporting(pdev); 1722a0a3408eSKeith Busch pci_save_state(pdev); 172357dacad5SJay Sternberg return 0; 172457dacad5SJay Sternberg 172557dacad5SJay Sternberg disable: 172657dacad5SJay Sternberg pci_disable_device(pdev); 172757dacad5SJay Sternberg return result; 172857dacad5SJay Sternberg } 172957dacad5SJay Sternberg 173057dacad5SJay Sternberg static void nvme_dev_unmap(struct nvme_dev *dev) 173157dacad5SJay Sternberg { 1732b00a726aSKeith Busch if (dev->bar) 1733b00a726aSKeith Busch iounmap(dev->bar); 1734b00a726aSKeith Busch pci_release_regions(to_pci_dev(dev->dev)); 1735b00a726aSKeith Busch } 1736b00a726aSKeith Busch 1737b00a726aSKeith Busch static void nvme_pci_disable(struct nvme_dev *dev) 1738b00a726aSKeith Busch { 173957dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 174057dacad5SJay Sternberg 174157dacad5SJay Sternberg if (pdev->msi_enabled) 174257dacad5SJay Sternberg pci_disable_msi(pdev); 174357dacad5SJay Sternberg else if (pdev->msix_enabled) 174457dacad5SJay Sternberg pci_disable_msix(pdev); 174557dacad5SJay Sternberg 1746a0a3408eSKeith Busch if (pci_is_enabled(pdev)) { 1747a0a3408eSKeith Busch pci_disable_pcie_error_reporting(pdev); 174857dacad5SJay Sternberg pci_disable_device(pdev); 174957dacad5SJay Sternberg } 1750a0a3408eSKeith Busch } 175157dacad5SJay Sternberg 1752a5cdb68cSKeith Busch static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown) 175357dacad5SJay Sternberg { 175457dacad5SJay Sternberg int i; 175557dacad5SJay Sternberg u32 csts = -1; 175657dacad5SJay Sternberg 17572d55cd5fSChristoph Hellwig del_timer_sync(&dev->watchdog_timer); 175857dacad5SJay Sternberg 175977bf25eaSKeith Busch mutex_lock(&dev->shutdown_lock); 1760b00a726aSKeith Busch if (pci_is_enabled(to_pci_dev(dev->dev))) { 176125646264SKeith Busch nvme_stop_queues(&dev->ctrl); 17627a67cbeaSChristoph Hellwig csts = readl(dev->bar + NVME_REG_CSTS); 176357dacad5SJay Sternberg } 176457dacad5SJay Sternberg if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) { 176557dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= 0; i--) { 176657dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 176757dacad5SJay Sternberg nvme_suspend_queue(nvmeq); 176857dacad5SJay Sternberg } 176957dacad5SJay Sternberg } else { 177057dacad5SJay Sternberg nvme_disable_io_queues(dev); 1771a5cdb68cSKeith Busch nvme_disable_admin_queue(dev, shutdown); 177257dacad5SJay Sternberg } 1773b00a726aSKeith Busch nvme_pci_disable(dev); 177457dacad5SJay Sternberg 177582b4552bSSagi Grimberg blk_mq_tagset_busy_iter(&dev->tagset, nvme_cancel_io, dev); 177682b4552bSSagi Grimberg blk_mq_tagset_busy_iter(&dev->admin_tagset, nvme_cancel_io, dev); 177777bf25eaSKeith Busch mutex_unlock(&dev->shutdown_lock); 177857dacad5SJay Sternberg } 177957dacad5SJay Sternberg 178057dacad5SJay Sternberg static int nvme_setup_prp_pools(struct nvme_dev *dev) 178157dacad5SJay Sternberg { 178257dacad5SJay Sternberg dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, 178357dacad5SJay Sternberg PAGE_SIZE, PAGE_SIZE, 0); 178457dacad5SJay Sternberg if (!dev->prp_page_pool) 178557dacad5SJay Sternberg return -ENOMEM; 178657dacad5SJay Sternberg 178757dacad5SJay Sternberg /* Optimisation for I/Os between 4k and 128k */ 178857dacad5SJay Sternberg dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, 178957dacad5SJay Sternberg 256, 256, 0); 179057dacad5SJay Sternberg if (!dev->prp_small_pool) { 179157dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 179257dacad5SJay Sternberg return -ENOMEM; 179357dacad5SJay Sternberg } 179457dacad5SJay Sternberg return 0; 179557dacad5SJay Sternberg } 179657dacad5SJay Sternberg 179757dacad5SJay Sternberg static void nvme_release_prp_pools(struct nvme_dev *dev) 179857dacad5SJay Sternberg { 179957dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 180057dacad5SJay Sternberg dma_pool_destroy(dev->prp_small_pool); 180157dacad5SJay Sternberg } 180257dacad5SJay Sternberg 18031673f1f0SChristoph Hellwig static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) 180457dacad5SJay Sternberg { 18051673f1f0SChristoph Hellwig struct nvme_dev *dev = to_nvme_dev(ctrl); 180657dacad5SJay Sternberg 180757dacad5SJay Sternberg put_device(dev->dev); 180857dacad5SJay Sternberg if (dev->tagset.tags) 180957dacad5SJay Sternberg blk_mq_free_tag_set(&dev->tagset); 18101c63dc66SChristoph Hellwig if (dev->ctrl.admin_q) 18111c63dc66SChristoph Hellwig blk_put_queue(dev->ctrl.admin_q); 181257dacad5SJay Sternberg kfree(dev->queues); 181357dacad5SJay Sternberg kfree(dev->entry); 181457dacad5SJay Sternberg kfree(dev); 181557dacad5SJay Sternberg } 181657dacad5SJay Sternberg 1817f58944e2SKeith Busch static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status) 1818f58944e2SKeith Busch { 1819237045fcSLinus Torvalds dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status); 1820f58944e2SKeith Busch 1821f58944e2SKeith Busch kref_get(&dev->ctrl.kref); 182269d9a99cSKeith Busch nvme_dev_disable(dev, false); 1823f58944e2SKeith Busch if (!schedule_work(&dev->remove_work)) 1824f58944e2SKeith Busch nvme_put_ctrl(&dev->ctrl); 1825f58944e2SKeith Busch } 1826f58944e2SKeith Busch 1827fd634f41SChristoph Hellwig static void nvme_reset_work(struct work_struct *work) 182857dacad5SJay Sternberg { 1829fd634f41SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work); 1830f58944e2SKeith Busch int result = -ENODEV; 183157dacad5SJay Sternberg 1832*bb8d261eSChristoph Hellwig if (WARN_ON(dev->ctrl.state == NVME_CTRL_RESETTING)) 1833fd634f41SChristoph Hellwig goto out; 1834fd634f41SChristoph Hellwig 1835fd634f41SChristoph Hellwig /* 1836fd634f41SChristoph Hellwig * If we're called to reset a live controller first shut it down before 1837fd634f41SChristoph Hellwig * moving on. 1838fd634f41SChristoph Hellwig */ 1839b00a726aSKeith Busch if (dev->ctrl.ctrl_config & NVME_CC_ENABLE) 1840a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 1841fd634f41SChristoph Hellwig 1842*bb8d261eSChristoph Hellwig if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RESETTING)) 1843*bb8d261eSChristoph Hellwig goto out; 1844fd634f41SChristoph Hellwig 1845b00a726aSKeith Busch result = nvme_pci_enable(dev); 184657dacad5SJay Sternberg if (result) 184757dacad5SJay Sternberg goto out; 184857dacad5SJay Sternberg 184957dacad5SJay Sternberg result = nvme_configure_admin_queue(dev); 185057dacad5SJay Sternberg if (result) 1851f58944e2SKeith Busch goto out; 185257dacad5SJay Sternberg 185357dacad5SJay Sternberg nvme_init_queue(dev->queues[0], 0); 185457dacad5SJay Sternberg result = nvme_alloc_admin_tags(dev); 185557dacad5SJay Sternberg if (result) 1856f58944e2SKeith Busch goto out; 185757dacad5SJay Sternberg 1858ce4541f4SChristoph Hellwig result = nvme_init_identify(&dev->ctrl); 1859ce4541f4SChristoph Hellwig if (result) 1860f58944e2SKeith Busch goto out; 1861ce4541f4SChristoph Hellwig 186257dacad5SJay Sternberg result = nvme_setup_io_queues(dev); 186357dacad5SJay Sternberg if (result) 1864f58944e2SKeith Busch goto out; 186557dacad5SJay Sternberg 186621f033f7SKeith Busch /* 186721f033f7SKeith Busch * A controller that can not execute IO typically requires user 186821f033f7SKeith Busch * intervention to correct. For such degraded controllers, the driver 186921f033f7SKeith Busch * should not submit commands the user did not request, so skip 187021f033f7SKeith Busch * registering for asynchronous event notification on this condition. 187121f033f7SKeith Busch */ 187221f033f7SKeith Busch if (dev->online_queues > 1) { 1873adf68f21SChristoph Hellwig dev->ctrl.event_limit = NVME_NR_AEN_COMMANDS; 18749396dec9SChristoph Hellwig queue_work(nvme_workq, &dev->async_work); 187521f033f7SKeith Busch } 187657dacad5SJay Sternberg 18772d55cd5fSChristoph Hellwig mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ)); 187857dacad5SJay Sternberg 187957dacad5SJay Sternberg /* 188057dacad5SJay Sternberg * Keep the controller around but remove all namespaces if we don't have 188157dacad5SJay Sternberg * any working I/O queue. 188257dacad5SJay Sternberg */ 188357dacad5SJay Sternberg if (dev->online_queues < 2) { 18841b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "IO queues not created\n"); 18853b24774eSKeith Busch nvme_kill_queues(&dev->ctrl); 18865bae7f73SChristoph Hellwig nvme_remove_namespaces(&dev->ctrl); 188757dacad5SJay Sternberg } else { 188825646264SKeith Busch nvme_start_queues(&dev->ctrl); 188957dacad5SJay Sternberg nvme_dev_add(dev); 189057dacad5SJay Sternberg } 189157dacad5SJay Sternberg 1892*bb8d261eSChristoph Hellwig if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_LIVE)) { 1893*bb8d261eSChristoph Hellwig dev_warn(dev->ctrl.device, "failed to mark controller live\n"); 1894*bb8d261eSChristoph Hellwig goto out; 1895*bb8d261eSChristoph Hellwig } 189657dacad5SJay Sternberg return; 189757dacad5SJay Sternberg 189857dacad5SJay Sternberg out: 1899f58944e2SKeith Busch nvme_remove_dead_ctrl(dev, result); 190057dacad5SJay Sternberg } 190157dacad5SJay Sternberg 19025c8809e6SChristoph Hellwig static void nvme_remove_dead_ctrl_work(struct work_struct *work) 190357dacad5SJay Sternberg { 19045c8809e6SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work); 190557dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 190657dacad5SJay Sternberg 190769d9a99cSKeith Busch nvme_kill_queues(&dev->ctrl); 190857dacad5SJay Sternberg if (pci_get_drvdata(pdev)) 190957dacad5SJay Sternberg pci_stop_and_remove_bus_device_locked(pdev); 19101673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 191157dacad5SJay Sternberg } 191257dacad5SJay Sternberg 191357dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev) 191457dacad5SJay Sternberg { 19151c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q || blk_queue_dying(dev->ctrl.admin_q)) 191657dacad5SJay Sternberg return -ENODEV; 191757dacad5SJay Sternberg 1918846cc05fSChristoph Hellwig if (!queue_work(nvme_workq, &dev->reset_work)) 1919846cc05fSChristoph Hellwig return -EBUSY; 192057dacad5SJay Sternberg 192157dacad5SJay Sternberg flush_work(&dev->reset_work); 192257dacad5SJay Sternberg return 0; 192357dacad5SJay Sternberg } 192457dacad5SJay Sternberg 19251c63dc66SChristoph Hellwig static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) 192657dacad5SJay Sternberg { 19271c63dc66SChristoph Hellwig *val = readl(to_nvme_dev(ctrl)->bar + off); 19281c63dc66SChristoph Hellwig return 0; 192957dacad5SJay Sternberg } 19301c63dc66SChristoph Hellwig 19315fd4ce1bSChristoph Hellwig static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) 19325fd4ce1bSChristoph Hellwig { 19335fd4ce1bSChristoph Hellwig writel(val, to_nvme_dev(ctrl)->bar + off); 19345fd4ce1bSChristoph Hellwig return 0; 19355fd4ce1bSChristoph Hellwig } 19365fd4ce1bSChristoph Hellwig 19377fd8930fSChristoph Hellwig static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) 19387fd8930fSChristoph Hellwig { 19397fd8930fSChristoph Hellwig *val = readq(to_nvme_dev(ctrl)->bar + off); 19407fd8930fSChristoph Hellwig return 0; 19417fd8930fSChristoph Hellwig } 19427fd8930fSChristoph Hellwig 1943f3ca80fcSChristoph Hellwig static int nvme_pci_reset_ctrl(struct nvme_ctrl *ctrl) 1944f3ca80fcSChristoph Hellwig { 1945f3ca80fcSChristoph Hellwig return nvme_reset(to_nvme_dev(ctrl)); 1946f3ca80fcSChristoph Hellwig } 1947f3ca80fcSChristoph Hellwig 19481c63dc66SChristoph Hellwig static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { 1949e439bb12SSagi Grimberg .module = THIS_MODULE, 19501c63dc66SChristoph Hellwig .reg_read32 = nvme_pci_reg_read32, 19515fd4ce1bSChristoph Hellwig .reg_write32 = nvme_pci_reg_write32, 19527fd8930fSChristoph Hellwig .reg_read64 = nvme_pci_reg_read64, 1953f3ca80fcSChristoph Hellwig .reset_ctrl = nvme_pci_reset_ctrl, 19541673f1f0SChristoph Hellwig .free_ctrl = nvme_pci_free_ctrl, 19551c63dc66SChristoph Hellwig }; 195657dacad5SJay Sternberg 1957b00a726aSKeith Busch static int nvme_dev_map(struct nvme_dev *dev) 1958b00a726aSKeith Busch { 1959b00a726aSKeith Busch int bars; 1960b00a726aSKeith Busch struct pci_dev *pdev = to_pci_dev(dev->dev); 1961b00a726aSKeith Busch 1962b00a726aSKeith Busch bars = pci_select_bars(pdev, IORESOURCE_MEM); 1963b00a726aSKeith Busch if (!bars) 1964b00a726aSKeith Busch return -ENODEV; 1965b00a726aSKeith Busch if (pci_request_selected_regions(pdev, bars, "nvme")) 1966b00a726aSKeith Busch return -ENODEV; 1967b00a726aSKeith Busch 1968b00a726aSKeith Busch dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); 1969b00a726aSKeith Busch if (!dev->bar) 1970b00a726aSKeith Busch goto release; 1971b00a726aSKeith Busch 1972b00a726aSKeith Busch return 0; 1973b00a726aSKeith Busch release: 1974b00a726aSKeith Busch pci_release_regions(pdev); 1975b00a726aSKeith Busch return -ENODEV; 1976b00a726aSKeith Busch } 1977b00a726aSKeith Busch 197857dacad5SJay Sternberg static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 197957dacad5SJay Sternberg { 198057dacad5SJay Sternberg int node, result = -ENOMEM; 198157dacad5SJay Sternberg struct nvme_dev *dev; 198257dacad5SJay Sternberg 198357dacad5SJay Sternberg node = dev_to_node(&pdev->dev); 198457dacad5SJay Sternberg if (node == NUMA_NO_NODE) 198557dacad5SJay Sternberg set_dev_node(&pdev->dev, 0); 198657dacad5SJay Sternberg 198757dacad5SJay Sternberg dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); 198857dacad5SJay Sternberg if (!dev) 198957dacad5SJay Sternberg return -ENOMEM; 199057dacad5SJay Sternberg dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry), 199157dacad5SJay Sternberg GFP_KERNEL, node); 199257dacad5SJay Sternberg if (!dev->entry) 199357dacad5SJay Sternberg goto free; 199457dacad5SJay Sternberg dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), 199557dacad5SJay Sternberg GFP_KERNEL, node); 199657dacad5SJay Sternberg if (!dev->queues) 199757dacad5SJay Sternberg goto free; 199857dacad5SJay Sternberg 199957dacad5SJay Sternberg dev->dev = get_device(&pdev->dev); 200057dacad5SJay Sternberg pci_set_drvdata(pdev, dev); 200157dacad5SJay Sternberg 2002b00a726aSKeith Busch result = nvme_dev_map(dev); 2003b00a726aSKeith Busch if (result) 2004b00a726aSKeith Busch goto free; 2005b00a726aSKeith Busch 200657dacad5SJay Sternberg INIT_WORK(&dev->scan_work, nvme_dev_scan); 2007f3ca80fcSChristoph Hellwig INIT_WORK(&dev->reset_work, nvme_reset_work); 20085c8809e6SChristoph Hellwig INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work); 20099396dec9SChristoph Hellwig INIT_WORK(&dev->async_work, nvme_async_event_work); 20102d55cd5fSChristoph Hellwig setup_timer(&dev->watchdog_timer, nvme_watchdog_timer, 20112d55cd5fSChristoph Hellwig (unsigned long)dev); 201277bf25eaSKeith Busch mutex_init(&dev->shutdown_lock); 2013db3cbfffSKeith Busch init_completion(&dev->ioq_wait); 2014f3ca80fcSChristoph Hellwig 2015f3ca80fcSChristoph Hellwig result = nvme_setup_prp_pools(dev); 2016f3ca80fcSChristoph Hellwig if (result) 2017f3ca80fcSChristoph Hellwig goto put_pci; 2018f3ca80fcSChristoph Hellwig 2019f3ca80fcSChristoph Hellwig result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops, 2020f3ca80fcSChristoph Hellwig id->driver_data); 2021f3ca80fcSChristoph Hellwig if (result) 2022f3ca80fcSChristoph Hellwig goto release_pools; 2023f3ca80fcSChristoph Hellwig 20241b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev)); 20251b3c47c1SSagi Grimberg 202692f7a162SKeith Busch queue_work(nvme_workq, &dev->reset_work); 202757dacad5SJay Sternberg return 0; 202857dacad5SJay Sternberg 202957dacad5SJay Sternberg release_pools: 203057dacad5SJay Sternberg nvme_release_prp_pools(dev); 203157dacad5SJay Sternberg put_pci: 203257dacad5SJay Sternberg put_device(dev->dev); 2033b00a726aSKeith Busch nvme_dev_unmap(dev); 203457dacad5SJay Sternberg free: 203557dacad5SJay Sternberg kfree(dev->queues); 203657dacad5SJay Sternberg kfree(dev->entry); 203757dacad5SJay Sternberg kfree(dev); 203857dacad5SJay Sternberg return result; 203957dacad5SJay Sternberg } 204057dacad5SJay Sternberg 204157dacad5SJay Sternberg static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) 204257dacad5SJay Sternberg { 204357dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 204457dacad5SJay Sternberg 204557dacad5SJay Sternberg if (prepare) 2046a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 204757dacad5SJay Sternberg else 204892f7a162SKeith Busch queue_work(nvme_workq, &dev->reset_work); 204957dacad5SJay Sternberg } 205057dacad5SJay Sternberg 205157dacad5SJay Sternberg static void nvme_shutdown(struct pci_dev *pdev) 205257dacad5SJay Sternberg { 205357dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 2054a5cdb68cSKeith Busch nvme_dev_disable(dev, true); 205557dacad5SJay Sternberg } 205657dacad5SJay Sternberg 2057f58944e2SKeith Busch /* 2058f58944e2SKeith Busch * The driver's remove may be called on a device in a partially initialized 2059f58944e2SKeith Busch * state. This function must not have any dependencies on the device state in 2060f58944e2SKeith Busch * order to proceed. 2061f58944e2SKeith Busch */ 206257dacad5SJay Sternberg static void nvme_remove(struct pci_dev *pdev) 206357dacad5SJay Sternberg { 206457dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 206557dacad5SJay Sternberg 20662d55cd5fSChristoph Hellwig del_timer_sync(&dev->watchdog_timer); 206757dacad5SJay Sternberg 2068*bb8d261eSChristoph Hellwig nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING); 2069*bb8d261eSChristoph Hellwig 207057dacad5SJay Sternberg pci_set_drvdata(pdev, NULL); 20719396dec9SChristoph Hellwig flush_work(&dev->async_work); 207257dacad5SJay Sternberg flush_work(&dev->scan_work); 20735bae7f73SChristoph Hellwig nvme_remove_namespaces(&dev->ctrl); 207453029b04SKeith Busch nvme_uninit_ctrl(&dev->ctrl); 2075a5cdb68cSKeith Busch nvme_dev_disable(dev, true); 2076ff23a2a1SKeith Busch flush_work(&dev->reset_work); 207757dacad5SJay Sternberg nvme_dev_remove_admin(dev); 207857dacad5SJay Sternberg nvme_free_queues(dev, 0); 207957dacad5SJay Sternberg nvme_release_cmb(dev); 208057dacad5SJay Sternberg nvme_release_prp_pools(dev); 2081b00a726aSKeith Busch nvme_dev_unmap(dev); 20821673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 208357dacad5SJay Sternberg } 208457dacad5SJay Sternberg 208557dacad5SJay Sternberg #ifdef CONFIG_PM_SLEEP 208657dacad5SJay Sternberg static int nvme_suspend(struct device *dev) 208757dacad5SJay Sternberg { 208857dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 208957dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 209057dacad5SJay Sternberg 2091a5cdb68cSKeith Busch nvme_dev_disable(ndev, true); 209257dacad5SJay Sternberg return 0; 209357dacad5SJay Sternberg } 209457dacad5SJay Sternberg 209557dacad5SJay Sternberg static int nvme_resume(struct device *dev) 209657dacad5SJay Sternberg { 209757dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 209857dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 209957dacad5SJay Sternberg 210092f7a162SKeith Busch queue_work(nvme_workq, &ndev->reset_work); 210157dacad5SJay Sternberg return 0; 210257dacad5SJay Sternberg } 210357dacad5SJay Sternberg #endif 210457dacad5SJay Sternberg 210557dacad5SJay Sternberg static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); 210657dacad5SJay Sternberg 2107a0a3408eSKeith Busch static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev, 2108a0a3408eSKeith Busch pci_channel_state_t state) 2109a0a3408eSKeith Busch { 2110a0a3408eSKeith Busch struct nvme_dev *dev = pci_get_drvdata(pdev); 2111a0a3408eSKeith Busch 2112a0a3408eSKeith Busch /* 2113a0a3408eSKeith Busch * A frozen channel requires a reset. When detected, this method will 2114a0a3408eSKeith Busch * shutdown the controller to quiesce. The controller will be restarted 2115a0a3408eSKeith Busch * after the slot reset through driver's slot_reset callback. 2116a0a3408eSKeith Busch */ 21171b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "error detected: state:%d\n", state); 2118a0a3408eSKeith Busch switch (state) { 2119a0a3408eSKeith Busch case pci_channel_io_normal: 2120a0a3408eSKeith Busch return PCI_ERS_RESULT_CAN_RECOVER; 2121a0a3408eSKeith Busch case pci_channel_io_frozen: 2122a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 2123a0a3408eSKeith Busch return PCI_ERS_RESULT_NEED_RESET; 2124a0a3408eSKeith Busch case pci_channel_io_perm_failure: 2125a0a3408eSKeith Busch return PCI_ERS_RESULT_DISCONNECT; 2126a0a3408eSKeith Busch } 2127a0a3408eSKeith Busch return PCI_ERS_RESULT_NEED_RESET; 2128a0a3408eSKeith Busch } 2129a0a3408eSKeith Busch 2130a0a3408eSKeith Busch static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev) 2131a0a3408eSKeith Busch { 2132a0a3408eSKeith Busch struct nvme_dev *dev = pci_get_drvdata(pdev); 2133a0a3408eSKeith Busch 21341b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "restart after slot reset\n"); 2135a0a3408eSKeith Busch pci_restore_state(pdev); 2136a0a3408eSKeith Busch queue_work(nvme_workq, &dev->reset_work); 2137a0a3408eSKeith Busch return PCI_ERS_RESULT_RECOVERED; 2138a0a3408eSKeith Busch } 2139a0a3408eSKeith Busch 2140a0a3408eSKeith Busch static void nvme_error_resume(struct pci_dev *pdev) 2141a0a3408eSKeith Busch { 2142a0a3408eSKeith Busch pci_cleanup_aer_uncorrect_error_status(pdev); 2143a0a3408eSKeith Busch } 2144a0a3408eSKeith Busch 214557dacad5SJay Sternberg static const struct pci_error_handlers nvme_err_handler = { 214657dacad5SJay Sternberg .error_detected = nvme_error_detected, 214757dacad5SJay Sternberg .slot_reset = nvme_slot_reset, 214857dacad5SJay Sternberg .resume = nvme_error_resume, 214957dacad5SJay Sternberg .reset_notify = nvme_reset_notify, 215057dacad5SJay Sternberg }; 215157dacad5SJay Sternberg 215257dacad5SJay Sternberg /* Move to pci_ids.h later */ 215357dacad5SJay Sternberg #define PCI_CLASS_STORAGE_EXPRESS 0x010802 215457dacad5SJay Sternberg 215557dacad5SJay Sternberg static const struct pci_device_id nvme_id_table[] = { 2156106198edSChristoph Hellwig { PCI_VDEVICE(INTEL, 0x0953), 215708095e70SKeith Busch .driver_data = NVME_QUIRK_STRIPE_SIZE | 215808095e70SKeith Busch NVME_QUIRK_DISCARD_ZEROES, }, 2159540c801cSKeith Busch { PCI_VDEVICE(INTEL, 0x5845), /* Qemu emulated controller */ 2160540c801cSKeith Busch .driver_data = NVME_QUIRK_IDENTIFY_CNS, }, 216157dacad5SJay Sternberg { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, 2162c74dc780SStephan Günther { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, 216357dacad5SJay Sternberg { 0, } 216457dacad5SJay Sternberg }; 216557dacad5SJay Sternberg MODULE_DEVICE_TABLE(pci, nvme_id_table); 216657dacad5SJay Sternberg 216757dacad5SJay Sternberg static struct pci_driver nvme_driver = { 216857dacad5SJay Sternberg .name = "nvme", 216957dacad5SJay Sternberg .id_table = nvme_id_table, 217057dacad5SJay Sternberg .probe = nvme_probe, 217157dacad5SJay Sternberg .remove = nvme_remove, 217257dacad5SJay Sternberg .shutdown = nvme_shutdown, 217357dacad5SJay Sternberg .driver = { 217457dacad5SJay Sternberg .pm = &nvme_dev_pm_ops, 217557dacad5SJay Sternberg }, 217657dacad5SJay Sternberg .err_handler = &nvme_err_handler, 217757dacad5SJay Sternberg }; 217857dacad5SJay Sternberg 217957dacad5SJay Sternberg static int __init nvme_init(void) 218057dacad5SJay Sternberg { 218157dacad5SJay Sternberg int result; 218257dacad5SJay Sternberg 218392f7a162SKeith Busch nvme_workq = alloc_workqueue("nvme", WQ_UNBOUND | WQ_MEM_RECLAIM, 0); 218457dacad5SJay Sternberg if (!nvme_workq) 218557dacad5SJay Sternberg return -ENOMEM; 218657dacad5SJay Sternberg 218757dacad5SJay Sternberg result = pci_register_driver(&nvme_driver); 218857dacad5SJay Sternberg if (result) 218957dacad5SJay Sternberg destroy_workqueue(nvme_workq); 219057dacad5SJay Sternberg return result; 219157dacad5SJay Sternberg } 219257dacad5SJay Sternberg 219357dacad5SJay Sternberg static void __exit nvme_exit(void) 219457dacad5SJay Sternberg { 219557dacad5SJay Sternberg pci_unregister_driver(&nvme_driver); 219657dacad5SJay Sternberg destroy_workqueue(nvme_workq); 219757dacad5SJay Sternberg _nvme_check_size(); 219857dacad5SJay Sternberg } 219957dacad5SJay Sternberg 220057dacad5SJay Sternberg MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); 220157dacad5SJay Sternberg MODULE_LICENSE("GPL"); 220257dacad5SJay Sternberg MODULE_VERSION("1.0"); 220357dacad5SJay Sternberg module_init(nvme_init); 220457dacad5SJay Sternberg module_exit(nvme_exit); 2205