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); 745c8809e6SChristoph Hellwig static void nvme_remove_dead_ctrl(struct nvme_dev *dev); 75a5cdb68cSKeith Busch static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown); 7657dacad5SJay Sternberg 7757dacad5SJay Sternberg /* 781c63dc66SChristoph Hellwig * Represents an NVM Express device. Each nvme_dev is a PCI function. 791c63dc66SChristoph Hellwig */ 801c63dc66SChristoph Hellwig struct nvme_dev { 811c63dc66SChristoph Hellwig struct nvme_queue **queues; 821c63dc66SChristoph Hellwig struct blk_mq_tag_set tagset; 831c63dc66SChristoph Hellwig struct blk_mq_tag_set admin_tagset; 841c63dc66SChristoph Hellwig u32 __iomem *dbs; 851c63dc66SChristoph Hellwig struct device *dev; 861c63dc66SChristoph Hellwig struct dma_pool *prp_page_pool; 871c63dc66SChristoph Hellwig struct dma_pool *prp_small_pool; 881c63dc66SChristoph Hellwig unsigned queue_count; 891c63dc66SChristoph Hellwig unsigned online_queues; 901c63dc66SChristoph Hellwig unsigned max_qid; 911c63dc66SChristoph Hellwig int q_depth; 921c63dc66SChristoph Hellwig u32 db_stride; 931c63dc66SChristoph Hellwig struct msix_entry *entry; 941c63dc66SChristoph Hellwig void __iomem *bar; 951c63dc66SChristoph Hellwig struct work_struct reset_work; 961c63dc66SChristoph Hellwig struct work_struct scan_work; 975c8809e6SChristoph Hellwig struct work_struct remove_work; 989396dec9SChristoph Hellwig struct work_struct async_work; 992d55cd5fSChristoph Hellwig struct timer_list watchdog_timer; 10077bf25eaSKeith Busch struct mutex shutdown_lock; 1011c63dc66SChristoph Hellwig bool subsystem; 1021c63dc66SChristoph Hellwig void __iomem *cmb; 1031c63dc66SChristoph Hellwig dma_addr_t cmb_dma_addr; 1041c63dc66SChristoph Hellwig u64 cmb_size; 1051c63dc66SChristoph Hellwig u32 cmbsz; 106fd634f41SChristoph Hellwig unsigned long flags; 107db3cbfffSKeith Busch 108fd634f41SChristoph Hellwig #define NVME_CTRL_RESETTING 0 1091c63dc66SChristoph Hellwig 1101c63dc66SChristoph Hellwig struct nvme_ctrl ctrl; 111db3cbfffSKeith Busch struct completion ioq_wait; 11257dacad5SJay Sternberg }; 11357dacad5SJay Sternberg 1141c63dc66SChristoph Hellwig static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) 1151c63dc66SChristoph Hellwig { 1161c63dc66SChristoph Hellwig return container_of(ctrl, struct nvme_dev, ctrl); 1171c63dc66SChristoph Hellwig } 1181c63dc66SChristoph Hellwig 11957dacad5SJay Sternberg /* 12057dacad5SJay Sternberg * An NVM Express queue. Each device has at least two (one for admin 12157dacad5SJay Sternberg * commands and one for I/O commands). 12257dacad5SJay Sternberg */ 12357dacad5SJay Sternberg struct nvme_queue { 12457dacad5SJay Sternberg struct device *q_dmadev; 12557dacad5SJay Sternberg struct nvme_dev *dev; 12657dacad5SJay Sternberg char irqname[24]; /* nvme4294967295-65535\0 */ 12757dacad5SJay Sternberg spinlock_t q_lock; 12857dacad5SJay Sternberg struct nvme_command *sq_cmds; 12957dacad5SJay Sternberg struct nvme_command __iomem *sq_cmds_io; 13057dacad5SJay Sternberg volatile struct nvme_completion *cqes; 13157dacad5SJay Sternberg struct blk_mq_tags **tags; 13257dacad5SJay Sternberg dma_addr_t sq_dma_addr; 13357dacad5SJay Sternberg dma_addr_t cq_dma_addr; 13457dacad5SJay Sternberg u32 __iomem *q_db; 13557dacad5SJay Sternberg u16 q_depth; 13657dacad5SJay Sternberg s16 cq_vector; 13757dacad5SJay Sternberg u16 sq_head; 13857dacad5SJay Sternberg u16 sq_tail; 13957dacad5SJay Sternberg u16 cq_head; 14057dacad5SJay Sternberg u16 qid; 14157dacad5SJay Sternberg u8 cq_phase; 14257dacad5SJay Sternberg u8 cqe_seen; 14357dacad5SJay Sternberg }; 14457dacad5SJay Sternberg 14557dacad5SJay Sternberg /* 14671bd150cSChristoph Hellwig * The nvme_iod describes the data in an I/O, including the list of PRP 14771bd150cSChristoph Hellwig * entries. You can't see it in this data structure because C doesn't let 148f4800d6dSChristoph Hellwig * me express that. Use nvme_init_iod to ensure there's enough space 14971bd150cSChristoph Hellwig * allocated to store the PRP list. 15071bd150cSChristoph Hellwig */ 15171bd150cSChristoph Hellwig struct nvme_iod { 152f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq; 153f4800d6dSChristoph Hellwig int aborted; 15471bd150cSChristoph Hellwig int npages; /* In the PRP list. 0 means small pool in use */ 15571bd150cSChristoph Hellwig int nents; /* Used in scatterlist */ 15671bd150cSChristoph Hellwig int length; /* Of data, in bytes */ 15771bd150cSChristoph Hellwig dma_addr_t first_dma; 158bf684057SChristoph Hellwig struct scatterlist meta_sg; /* metadata requires single contiguous buffer */ 159f4800d6dSChristoph Hellwig struct scatterlist *sg; 160f4800d6dSChristoph Hellwig struct scatterlist inline_sg[0]; 16157dacad5SJay Sternberg }; 16257dacad5SJay Sternberg 16357dacad5SJay Sternberg /* 16457dacad5SJay Sternberg * Check we didin't inadvertently grow the command struct 16557dacad5SJay Sternberg */ 16657dacad5SJay Sternberg static inline void _nvme_check_size(void) 16757dacad5SJay Sternberg { 16857dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); 16957dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); 17057dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); 17157dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); 17257dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_features) != 64); 17357dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); 17457dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); 17557dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_command) != 64); 17657dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); 17757dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); 17857dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); 17957dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); 18057dacad5SJay Sternberg } 18157dacad5SJay Sternberg 18257dacad5SJay Sternberg /* 18357dacad5SJay Sternberg * Max size of iod being embedded in the request payload 18457dacad5SJay Sternberg */ 18557dacad5SJay Sternberg #define NVME_INT_PAGES 2 1865fd4ce1bSChristoph Hellwig #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size) 18757dacad5SJay Sternberg 18857dacad5SJay Sternberg /* 18957dacad5SJay Sternberg * Will slightly overestimate the number of pages needed. This is OK 19057dacad5SJay Sternberg * as it only leads to a small amount of wasted memory for the lifetime of 19157dacad5SJay Sternberg * the I/O. 19257dacad5SJay Sternberg */ 19357dacad5SJay Sternberg static int nvme_npages(unsigned size, struct nvme_dev *dev) 19457dacad5SJay Sternberg { 1955fd4ce1bSChristoph Hellwig unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size, 1965fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 19757dacad5SJay Sternberg return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); 19857dacad5SJay Sternberg } 19957dacad5SJay Sternberg 200f4800d6dSChristoph Hellwig static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev, 201f4800d6dSChristoph Hellwig unsigned int size, unsigned int nseg) 202f4800d6dSChristoph Hellwig { 203f4800d6dSChristoph Hellwig return sizeof(__le64 *) * nvme_npages(size, dev) + 204f4800d6dSChristoph Hellwig sizeof(struct scatterlist) * nseg; 205f4800d6dSChristoph Hellwig } 206f4800d6dSChristoph Hellwig 20757dacad5SJay Sternberg static unsigned int nvme_cmd_size(struct nvme_dev *dev) 20857dacad5SJay Sternberg { 209f4800d6dSChristoph Hellwig return sizeof(struct nvme_iod) + 210f4800d6dSChristoph Hellwig nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES); 21157dacad5SJay Sternberg } 21257dacad5SJay Sternberg 21357dacad5SJay Sternberg static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 21457dacad5SJay Sternberg unsigned int hctx_idx) 21557dacad5SJay Sternberg { 21657dacad5SJay Sternberg struct nvme_dev *dev = data; 21757dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 21857dacad5SJay Sternberg 21957dacad5SJay Sternberg WARN_ON(hctx_idx != 0); 22057dacad5SJay Sternberg WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); 22157dacad5SJay Sternberg WARN_ON(nvmeq->tags); 22257dacad5SJay Sternberg 22357dacad5SJay Sternberg hctx->driver_data = nvmeq; 22457dacad5SJay Sternberg nvmeq->tags = &dev->admin_tagset.tags[0]; 22557dacad5SJay Sternberg return 0; 22657dacad5SJay Sternberg } 22757dacad5SJay Sternberg 22857dacad5SJay Sternberg static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) 22957dacad5SJay Sternberg { 23057dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 23157dacad5SJay Sternberg 23257dacad5SJay Sternberg nvmeq->tags = NULL; 23357dacad5SJay Sternberg } 23457dacad5SJay Sternberg 23557dacad5SJay Sternberg static int nvme_admin_init_request(void *data, struct request *req, 23657dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 23757dacad5SJay Sternberg unsigned int numa_node) 23857dacad5SJay Sternberg { 23957dacad5SJay Sternberg struct nvme_dev *dev = data; 240f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 24157dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 24257dacad5SJay Sternberg 24357dacad5SJay Sternberg BUG_ON(!nvmeq); 244f4800d6dSChristoph Hellwig iod->nvmeq = nvmeq; 24557dacad5SJay Sternberg return 0; 24657dacad5SJay Sternberg } 24757dacad5SJay Sternberg 24857dacad5SJay Sternberg static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 24957dacad5SJay Sternberg unsigned int hctx_idx) 25057dacad5SJay Sternberg { 25157dacad5SJay Sternberg struct nvme_dev *dev = data; 25257dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 25357dacad5SJay Sternberg 25457dacad5SJay Sternberg if (!nvmeq->tags) 25557dacad5SJay Sternberg nvmeq->tags = &dev->tagset.tags[hctx_idx]; 25657dacad5SJay Sternberg 25757dacad5SJay Sternberg WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); 25857dacad5SJay Sternberg hctx->driver_data = nvmeq; 25957dacad5SJay Sternberg return 0; 26057dacad5SJay Sternberg } 26157dacad5SJay Sternberg 26257dacad5SJay Sternberg static int nvme_init_request(void *data, struct request *req, 26357dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 26457dacad5SJay Sternberg unsigned int numa_node) 26557dacad5SJay Sternberg { 26657dacad5SJay Sternberg struct nvme_dev *dev = data; 267f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 26857dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 26957dacad5SJay Sternberg 27057dacad5SJay Sternberg BUG_ON(!nvmeq); 271f4800d6dSChristoph Hellwig iod->nvmeq = nvmeq; 27257dacad5SJay Sternberg return 0; 27357dacad5SJay Sternberg } 27457dacad5SJay Sternberg 275adf68f21SChristoph Hellwig static void nvme_complete_async_event(struct nvme_dev *dev, 27657dacad5SJay Sternberg struct nvme_completion *cqe) 27757dacad5SJay Sternberg { 278adf68f21SChristoph Hellwig u16 status = le16_to_cpu(cqe->status) >> 1; 279adf68f21SChristoph Hellwig u32 result = le32_to_cpu(cqe->result); 28057dacad5SJay Sternberg 2819396dec9SChristoph Hellwig if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) { 282adf68f21SChristoph Hellwig ++dev->ctrl.event_limit; 2839396dec9SChristoph Hellwig queue_work(nvme_workq, &dev->async_work); 2849396dec9SChristoph Hellwig } 2859396dec9SChristoph Hellwig 28657dacad5SJay Sternberg if (status != NVME_SC_SUCCESS) 28757dacad5SJay Sternberg return; 28857dacad5SJay Sternberg 28957dacad5SJay Sternberg switch (result & 0xff07) { 29057dacad5SJay Sternberg case NVME_AER_NOTICE_NS_CHANGED: 2911b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "rescanning\n"); 292adf68f21SChristoph Hellwig queue_work(nvme_workq, &dev->scan_work); 29357dacad5SJay Sternberg default: 2941b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "async event result %08x\n", result); 29557dacad5SJay Sternberg } 29657dacad5SJay Sternberg } 29757dacad5SJay Sternberg 29857dacad5SJay Sternberg /** 299adf68f21SChristoph Hellwig * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell 30057dacad5SJay Sternberg * @nvmeq: The queue to use 30157dacad5SJay Sternberg * @cmd: The command to send 30257dacad5SJay Sternberg * 30357dacad5SJay Sternberg * Safe to use from interrupt context 30457dacad5SJay Sternberg */ 30557dacad5SJay Sternberg static void __nvme_submit_cmd(struct nvme_queue *nvmeq, 30657dacad5SJay Sternberg struct nvme_command *cmd) 30757dacad5SJay Sternberg { 30857dacad5SJay Sternberg u16 tail = nvmeq->sq_tail; 30957dacad5SJay Sternberg 31057dacad5SJay Sternberg if (nvmeq->sq_cmds_io) 31157dacad5SJay Sternberg memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); 31257dacad5SJay Sternberg else 31357dacad5SJay Sternberg memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); 31457dacad5SJay Sternberg 31557dacad5SJay Sternberg if (++tail == nvmeq->q_depth) 31657dacad5SJay Sternberg tail = 0; 31757dacad5SJay Sternberg writel(tail, nvmeq->q_db); 31857dacad5SJay Sternberg nvmeq->sq_tail = tail; 31957dacad5SJay Sternberg } 32057dacad5SJay Sternberg 321f4800d6dSChristoph Hellwig static __le64 **iod_list(struct request *req) 32257dacad5SJay Sternberg { 323f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 324f4800d6dSChristoph Hellwig return (__le64 **)(iod->sg + req->nr_phys_segments); 32557dacad5SJay Sternberg } 32657dacad5SJay Sternberg 327f4800d6dSChristoph Hellwig static int nvme_init_iod(struct request *rq, struct nvme_dev *dev) 32857dacad5SJay Sternberg { 329f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(rq); 330f4800d6dSChristoph Hellwig int nseg = rq->nr_phys_segments; 331f4800d6dSChristoph Hellwig unsigned size; 332f4800d6dSChristoph Hellwig 333f4800d6dSChristoph Hellwig if (rq->cmd_flags & REQ_DISCARD) 334f4800d6dSChristoph Hellwig size = sizeof(struct nvme_dsm_range); 335f4800d6dSChristoph Hellwig else 336f4800d6dSChristoph Hellwig size = blk_rq_bytes(rq); 337f4800d6dSChristoph Hellwig 338f4800d6dSChristoph Hellwig if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { 339f4800d6dSChristoph Hellwig iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC); 340f4800d6dSChristoph Hellwig if (!iod->sg) 341f4800d6dSChristoph Hellwig return BLK_MQ_RQ_QUEUE_BUSY; 342f4800d6dSChristoph Hellwig } else { 343f4800d6dSChristoph Hellwig iod->sg = iod->inline_sg; 34457dacad5SJay Sternberg } 34557dacad5SJay Sternberg 346f4800d6dSChristoph Hellwig iod->aborted = 0; 34757dacad5SJay Sternberg iod->npages = -1; 34857dacad5SJay Sternberg iod->nents = 0; 349f4800d6dSChristoph Hellwig iod->length = size; 350f4800d6dSChristoph Hellwig return 0; 35157dacad5SJay Sternberg } 35257dacad5SJay Sternberg 353f4800d6dSChristoph Hellwig static void nvme_free_iod(struct nvme_dev *dev, struct request *req) 35457dacad5SJay Sternberg { 355f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 3565fd4ce1bSChristoph Hellwig const int last_prp = dev->ctrl.page_size / 8 - 1; 35757dacad5SJay Sternberg int i; 358f4800d6dSChristoph Hellwig __le64 **list = iod_list(req); 35957dacad5SJay Sternberg dma_addr_t prp_dma = iod->first_dma; 36057dacad5SJay Sternberg 36157dacad5SJay Sternberg if (iod->npages == 0) 36257dacad5SJay Sternberg dma_pool_free(dev->prp_small_pool, list[0], prp_dma); 36357dacad5SJay Sternberg for (i = 0; i < iod->npages; i++) { 36457dacad5SJay Sternberg __le64 *prp_list = list[i]; 36557dacad5SJay Sternberg dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); 36657dacad5SJay Sternberg dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); 36757dacad5SJay Sternberg prp_dma = next_prp_dma; 36857dacad5SJay Sternberg } 36957dacad5SJay Sternberg 370f4800d6dSChristoph Hellwig if (iod->sg != iod->inline_sg) 371f4800d6dSChristoph Hellwig kfree(iod->sg); 37257dacad5SJay Sternberg } 37357dacad5SJay Sternberg 37457dacad5SJay Sternberg #ifdef CONFIG_BLK_DEV_INTEGRITY 37557dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 37657dacad5SJay Sternberg { 37757dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == v) 37857dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(p); 37957dacad5SJay Sternberg } 38057dacad5SJay Sternberg 38157dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 38257dacad5SJay Sternberg { 38357dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == p) 38457dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(v); 38557dacad5SJay Sternberg } 38657dacad5SJay Sternberg 38757dacad5SJay Sternberg /** 38857dacad5SJay Sternberg * nvme_dif_remap - remaps ref tags to bip seed and physical lba 38957dacad5SJay Sternberg * 39057dacad5SJay Sternberg * The virtual start sector is the one that was originally submitted by the 39157dacad5SJay Sternberg * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical 39257dacad5SJay Sternberg * start sector may be different. Remap protection information to match the 39357dacad5SJay Sternberg * physical LBA on writes, and back to the original seed on reads. 39457dacad5SJay Sternberg * 39557dacad5SJay Sternberg * Type 0 and 3 do not have a ref tag, so no remapping required. 39657dacad5SJay Sternberg */ 39757dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 39857dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 39957dacad5SJay Sternberg { 40057dacad5SJay Sternberg struct nvme_ns *ns = req->rq_disk->private_data; 40157dacad5SJay Sternberg struct bio_integrity_payload *bip; 40257dacad5SJay Sternberg struct t10_pi_tuple *pi; 40357dacad5SJay Sternberg void *p, *pmap; 40457dacad5SJay Sternberg u32 i, nlb, ts, phys, virt; 40557dacad5SJay Sternberg 40657dacad5SJay Sternberg if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) 40757dacad5SJay Sternberg return; 40857dacad5SJay Sternberg 40957dacad5SJay Sternberg bip = bio_integrity(req->bio); 41057dacad5SJay Sternberg if (!bip) 41157dacad5SJay Sternberg return; 41257dacad5SJay Sternberg 41357dacad5SJay Sternberg pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; 41457dacad5SJay Sternberg 41557dacad5SJay Sternberg p = pmap; 41657dacad5SJay Sternberg virt = bip_get_seed(bip); 41757dacad5SJay Sternberg phys = nvme_block_nr(ns, blk_rq_pos(req)); 41857dacad5SJay Sternberg nlb = (blk_rq_bytes(req) >> ns->lba_shift); 419ac6fc48cSDan Williams ts = ns->disk->queue->integrity.tuple_size; 42057dacad5SJay Sternberg 42157dacad5SJay Sternberg for (i = 0; i < nlb; i++, virt++, phys++) { 42257dacad5SJay Sternberg pi = (struct t10_pi_tuple *)p; 42357dacad5SJay Sternberg dif_swap(phys, virt, pi); 42457dacad5SJay Sternberg p += ts; 42557dacad5SJay Sternberg } 42657dacad5SJay Sternberg kunmap_atomic(pmap); 42757dacad5SJay Sternberg } 42857dacad5SJay Sternberg #else /* CONFIG_BLK_DEV_INTEGRITY */ 42957dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 43057dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 43157dacad5SJay Sternberg { 43257dacad5SJay Sternberg } 43357dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 43457dacad5SJay Sternberg { 43557dacad5SJay Sternberg } 43657dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 43757dacad5SJay Sternberg { 43857dacad5SJay Sternberg } 43957dacad5SJay Sternberg #endif 44057dacad5SJay Sternberg 441f4800d6dSChristoph Hellwig static bool nvme_setup_prps(struct nvme_dev *dev, struct request *req, 44269d2b571SChristoph Hellwig int total_len) 44357dacad5SJay Sternberg { 444f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 44557dacad5SJay Sternberg struct dma_pool *pool; 44657dacad5SJay Sternberg int length = total_len; 44757dacad5SJay Sternberg struct scatterlist *sg = iod->sg; 44857dacad5SJay Sternberg int dma_len = sg_dma_len(sg); 44957dacad5SJay Sternberg u64 dma_addr = sg_dma_address(sg); 4505fd4ce1bSChristoph Hellwig u32 page_size = dev->ctrl.page_size; 45157dacad5SJay Sternberg int offset = dma_addr & (page_size - 1); 45257dacad5SJay Sternberg __le64 *prp_list; 453f4800d6dSChristoph Hellwig __le64 **list = iod_list(req); 45457dacad5SJay Sternberg dma_addr_t prp_dma; 45557dacad5SJay Sternberg int nprps, i; 45657dacad5SJay Sternberg 45757dacad5SJay Sternberg length -= (page_size - offset); 45857dacad5SJay Sternberg if (length <= 0) 45969d2b571SChristoph Hellwig return true; 46057dacad5SJay Sternberg 46157dacad5SJay Sternberg dma_len -= (page_size - offset); 46257dacad5SJay Sternberg if (dma_len) { 46357dacad5SJay Sternberg dma_addr += (page_size - offset); 46457dacad5SJay Sternberg } else { 46557dacad5SJay Sternberg sg = sg_next(sg); 46657dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 46757dacad5SJay Sternberg dma_len = sg_dma_len(sg); 46857dacad5SJay Sternberg } 46957dacad5SJay Sternberg 47057dacad5SJay Sternberg if (length <= page_size) { 47157dacad5SJay Sternberg iod->first_dma = dma_addr; 47269d2b571SChristoph Hellwig return true; 47357dacad5SJay Sternberg } 47457dacad5SJay Sternberg 47557dacad5SJay Sternberg nprps = DIV_ROUND_UP(length, page_size); 47657dacad5SJay Sternberg if (nprps <= (256 / 8)) { 47757dacad5SJay Sternberg pool = dev->prp_small_pool; 47857dacad5SJay Sternberg iod->npages = 0; 47957dacad5SJay Sternberg } else { 48057dacad5SJay Sternberg pool = dev->prp_page_pool; 48157dacad5SJay Sternberg iod->npages = 1; 48257dacad5SJay Sternberg } 48357dacad5SJay Sternberg 48469d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 48557dacad5SJay Sternberg if (!prp_list) { 48657dacad5SJay Sternberg iod->first_dma = dma_addr; 48757dacad5SJay Sternberg iod->npages = -1; 48869d2b571SChristoph Hellwig return false; 48957dacad5SJay Sternberg } 49057dacad5SJay Sternberg list[0] = prp_list; 49157dacad5SJay Sternberg iod->first_dma = prp_dma; 49257dacad5SJay Sternberg i = 0; 49357dacad5SJay Sternberg for (;;) { 49457dacad5SJay Sternberg if (i == page_size >> 3) { 49557dacad5SJay Sternberg __le64 *old_prp_list = prp_list; 49669d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 49757dacad5SJay Sternberg if (!prp_list) 49869d2b571SChristoph Hellwig return false; 49957dacad5SJay Sternberg list[iod->npages++] = prp_list; 50057dacad5SJay Sternberg prp_list[0] = old_prp_list[i - 1]; 50157dacad5SJay Sternberg old_prp_list[i - 1] = cpu_to_le64(prp_dma); 50257dacad5SJay Sternberg i = 1; 50357dacad5SJay Sternberg } 50457dacad5SJay Sternberg prp_list[i++] = cpu_to_le64(dma_addr); 50557dacad5SJay Sternberg dma_len -= page_size; 50657dacad5SJay Sternberg dma_addr += page_size; 50757dacad5SJay Sternberg length -= page_size; 50857dacad5SJay Sternberg if (length <= 0) 50957dacad5SJay Sternberg break; 51057dacad5SJay Sternberg if (dma_len > 0) 51157dacad5SJay Sternberg continue; 51257dacad5SJay Sternberg BUG_ON(dma_len < 0); 51357dacad5SJay Sternberg sg = sg_next(sg); 51457dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 51557dacad5SJay Sternberg dma_len = sg_dma_len(sg); 51657dacad5SJay Sternberg } 51757dacad5SJay Sternberg 51869d2b571SChristoph Hellwig return true; 51957dacad5SJay Sternberg } 52057dacad5SJay Sternberg 521f4800d6dSChristoph Hellwig static int nvme_map_data(struct nvme_dev *dev, struct request *req, 522ba1ca37eSChristoph Hellwig struct nvme_command *cmnd) 52357dacad5SJay Sternberg { 524f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 525ba1ca37eSChristoph Hellwig struct request_queue *q = req->q; 526ba1ca37eSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 527ba1ca37eSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 528ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_ERROR; 52957dacad5SJay Sternberg 530ba1ca37eSChristoph Hellwig sg_init_table(iod->sg, req->nr_phys_segments); 531ba1ca37eSChristoph Hellwig iod->nents = blk_rq_map_sg(q, req, iod->sg); 532ba1ca37eSChristoph Hellwig if (!iod->nents) 533ba1ca37eSChristoph Hellwig goto out; 534ba1ca37eSChristoph Hellwig 535ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_BUSY; 536ba1ca37eSChristoph Hellwig if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir)) 537ba1ca37eSChristoph Hellwig goto out; 538ba1ca37eSChristoph Hellwig 539f4800d6dSChristoph Hellwig if (!nvme_setup_prps(dev, req, blk_rq_bytes(req))) 540ba1ca37eSChristoph Hellwig goto out_unmap; 541ba1ca37eSChristoph Hellwig 542ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_ERROR; 543ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) { 544ba1ca37eSChristoph Hellwig if (blk_rq_count_integrity_sg(q, req->bio) != 1) 545ba1ca37eSChristoph Hellwig goto out_unmap; 546ba1ca37eSChristoph Hellwig 547bf684057SChristoph Hellwig sg_init_table(&iod->meta_sg, 1); 548bf684057SChristoph Hellwig if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1) 549ba1ca37eSChristoph Hellwig goto out_unmap; 550ba1ca37eSChristoph Hellwig 551ba1ca37eSChristoph Hellwig if (rq_data_dir(req)) 552ba1ca37eSChristoph Hellwig nvme_dif_remap(req, nvme_dif_prep); 553ba1ca37eSChristoph Hellwig 554bf684057SChristoph Hellwig if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir)) 555ba1ca37eSChristoph Hellwig goto out_unmap; 55657dacad5SJay Sternberg } 55757dacad5SJay Sternberg 558ba1ca37eSChristoph Hellwig cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); 559ba1ca37eSChristoph Hellwig cmnd->rw.prp2 = cpu_to_le64(iod->first_dma); 560ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) 561bf684057SChristoph Hellwig cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); 562ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_OK; 563ba1ca37eSChristoph Hellwig 564ba1ca37eSChristoph Hellwig out_unmap: 565ba1ca37eSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 566ba1ca37eSChristoph Hellwig out: 567ba1ca37eSChristoph Hellwig return ret; 56857dacad5SJay Sternberg } 56957dacad5SJay Sternberg 570f4800d6dSChristoph Hellwig static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) 571d4f6c3abSChristoph Hellwig { 572f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 573d4f6c3abSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 574d4f6c3abSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 575d4f6c3abSChristoph Hellwig 576d4f6c3abSChristoph Hellwig if (iod->nents) { 577d4f6c3abSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 578d4f6c3abSChristoph Hellwig if (blk_integrity_rq(req)) { 579d4f6c3abSChristoph Hellwig if (!rq_data_dir(req)) 580d4f6c3abSChristoph Hellwig nvme_dif_remap(req, nvme_dif_complete); 581bf684057SChristoph Hellwig dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir); 582d4f6c3abSChristoph Hellwig } 583d4f6c3abSChristoph Hellwig } 584d4f6c3abSChristoph Hellwig 585f4800d6dSChristoph Hellwig nvme_free_iod(dev, req); 58657dacad5SJay Sternberg } 58757dacad5SJay Sternberg 58857dacad5SJay Sternberg /* 58957dacad5SJay Sternberg * We reuse the small pool to allocate the 16-byte range here as it is not 59057dacad5SJay Sternberg * worth having a special pool for these or additional cases to handle freeing 59157dacad5SJay Sternberg * the iod. 59257dacad5SJay Sternberg */ 593ba1ca37eSChristoph Hellwig static int nvme_setup_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, 594f4800d6dSChristoph Hellwig struct request *req, struct nvme_command *cmnd) 59557dacad5SJay Sternberg { 596f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 597ba1ca37eSChristoph Hellwig struct nvme_dsm_range *range; 598ba1ca37eSChristoph Hellwig 599ba1ca37eSChristoph Hellwig range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC, 600ba1ca37eSChristoph Hellwig &iod->first_dma); 601ba1ca37eSChristoph Hellwig if (!range) 602ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_BUSY; 603f4800d6dSChristoph Hellwig iod_list(req)[0] = (__le64 *)range; 604ba1ca37eSChristoph Hellwig iod->npages = 0; 60557dacad5SJay Sternberg 60657dacad5SJay Sternberg range->cattr = cpu_to_le32(0); 60757dacad5SJay Sternberg range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift); 60857dacad5SJay Sternberg range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); 60957dacad5SJay Sternberg 610ba1ca37eSChristoph Hellwig memset(cmnd, 0, sizeof(*cmnd)); 611ba1ca37eSChristoph Hellwig cmnd->dsm.opcode = nvme_cmd_dsm; 612ba1ca37eSChristoph Hellwig cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); 613ba1ca37eSChristoph Hellwig cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma); 614ba1ca37eSChristoph Hellwig cmnd->dsm.nr = 0; 615ba1ca37eSChristoph Hellwig cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); 616ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_OK; 61757dacad5SJay Sternberg } 61857dacad5SJay Sternberg 61957dacad5SJay Sternberg /* 62057dacad5SJay Sternberg * NOTE: ns is NULL when called on the admin queue. 62157dacad5SJay Sternberg */ 62257dacad5SJay Sternberg static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 62357dacad5SJay Sternberg const struct blk_mq_queue_data *bd) 62457dacad5SJay Sternberg { 62557dacad5SJay Sternberg struct nvme_ns *ns = hctx->queue->queuedata; 62657dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 62757dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 62857dacad5SJay Sternberg struct request *req = bd->rq; 629ba1ca37eSChristoph Hellwig struct nvme_command cmnd; 630ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_OK; 63157dacad5SJay Sternberg 63257dacad5SJay Sternberg /* 63357dacad5SJay Sternberg * If formated with metadata, require the block layer provide a buffer 63457dacad5SJay Sternberg * unless this namespace is formated such that the metadata can be 63557dacad5SJay Sternberg * stripped/generated by the controller with PRACT=1. 63657dacad5SJay Sternberg */ 63757dacad5SJay Sternberg if (ns && ns->ms && !blk_integrity_rq(req)) { 63857dacad5SJay Sternberg if (!(ns->pi_type && ns->ms == 8) && 63957dacad5SJay Sternberg req->cmd_type != REQ_TYPE_DRV_PRIV) { 640eee417b0SChristoph Hellwig blk_mq_end_request(req, -EFAULT); 64157dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 64257dacad5SJay Sternberg } 64357dacad5SJay Sternberg } 64457dacad5SJay Sternberg 645f4800d6dSChristoph Hellwig ret = nvme_init_iod(req, dev); 646f4800d6dSChristoph Hellwig if (ret) 647f4800d6dSChristoph Hellwig return ret; 64857dacad5SJay Sternberg 64957dacad5SJay Sternberg if (req->cmd_flags & REQ_DISCARD) { 650f4800d6dSChristoph Hellwig ret = nvme_setup_discard(nvmeq, ns, req, &cmnd); 651ba1ca37eSChristoph Hellwig } else { 65257dacad5SJay Sternberg if (req->cmd_type == REQ_TYPE_DRV_PRIV) 653ba1ca37eSChristoph Hellwig memcpy(&cmnd, req->cmd, sizeof(cmnd)); 65457dacad5SJay Sternberg else if (req->cmd_flags & REQ_FLUSH) 655ba1ca37eSChristoph Hellwig nvme_setup_flush(ns, &cmnd); 65657dacad5SJay Sternberg else 657ba1ca37eSChristoph Hellwig nvme_setup_rw(ns, req, &cmnd); 65857dacad5SJay Sternberg 659ba1ca37eSChristoph Hellwig if (req->nr_phys_segments) 660f4800d6dSChristoph Hellwig ret = nvme_map_data(dev, req, &cmnd); 661ba1ca37eSChristoph Hellwig } 662ba1ca37eSChristoph Hellwig 663ba1ca37eSChristoph Hellwig if (ret) 664ba1ca37eSChristoph Hellwig goto out; 665ba1ca37eSChristoph Hellwig 666ba1ca37eSChristoph Hellwig cmnd.common.command_id = req->tag; 667aae239e1SChristoph Hellwig blk_mq_start_request(req); 668ba1ca37eSChristoph Hellwig 669ba1ca37eSChristoph Hellwig spin_lock_irq(&nvmeq->q_lock); 670ba1ca37eSChristoph Hellwig __nvme_submit_cmd(nvmeq, &cmnd); 67157dacad5SJay Sternberg nvme_process_cq(nvmeq); 67257dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 67357dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 674ba1ca37eSChristoph Hellwig out: 675f4800d6dSChristoph Hellwig nvme_free_iod(dev, req); 676ba1ca37eSChristoph Hellwig return ret; 67757dacad5SJay Sternberg } 67857dacad5SJay Sternberg 679eee417b0SChristoph Hellwig static void nvme_complete_rq(struct request *req) 680eee417b0SChristoph Hellwig { 681f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 682f4800d6dSChristoph Hellwig struct nvme_dev *dev = iod->nvmeq->dev; 683eee417b0SChristoph Hellwig int error = 0; 684eee417b0SChristoph Hellwig 685f4800d6dSChristoph Hellwig nvme_unmap_data(dev, req); 686eee417b0SChristoph Hellwig 687eee417b0SChristoph Hellwig if (unlikely(req->errors)) { 688eee417b0SChristoph Hellwig if (nvme_req_needs_retry(req, req->errors)) { 689eee417b0SChristoph Hellwig nvme_requeue_req(req); 690eee417b0SChristoph Hellwig return; 691eee417b0SChristoph Hellwig } 692eee417b0SChristoph Hellwig 693eee417b0SChristoph Hellwig if (req->cmd_type == REQ_TYPE_DRV_PRIV) 694eee417b0SChristoph Hellwig error = req->errors; 695eee417b0SChristoph Hellwig else 696eee417b0SChristoph Hellwig error = nvme_error_status(req->errors); 697eee417b0SChristoph Hellwig } 698eee417b0SChristoph Hellwig 699f4800d6dSChristoph Hellwig if (unlikely(iod->aborted)) { 7001b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 701eee417b0SChristoph Hellwig "completing aborted command with status: %04x\n", 702eee417b0SChristoph Hellwig req->errors); 703eee417b0SChristoph Hellwig } 704eee417b0SChristoph Hellwig 705eee417b0SChristoph Hellwig blk_mq_end_request(req, error); 70657dacad5SJay Sternberg } 70757dacad5SJay Sternberg 708a0fa9647SJens Axboe static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag) 70957dacad5SJay Sternberg { 71057dacad5SJay Sternberg u16 head, phase; 71157dacad5SJay Sternberg 71257dacad5SJay Sternberg head = nvmeq->cq_head; 71357dacad5SJay Sternberg phase = nvmeq->cq_phase; 71457dacad5SJay Sternberg 71557dacad5SJay Sternberg for (;;) { 71657dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[head]; 717adf68f21SChristoph Hellwig u16 status = le16_to_cpu(cqe.status); 718eee417b0SChristoph Hellwig struct request *req; 719adf68f21SChristoph Hellwig 720adf68f21SChristoph Hellwig if ((status & 1) != phase) 72157dacad5SJay Sternberg break; 72257dacad5SJay Sternberg nvmeq->sq_head = le16_to_cpu(cqe.sq_head); 72357dacad5SJay Sternberg if (++head == nvmeq->q_depth) { 72457dacad5SJay Sternberg head = 0; 72557dacad5SJay Sternberg phase = !phase; 72657dacad5SJay Sternberg } 727adf68f21SChristoph Hellwig 728a0fa9647SJens Axboe if (tag && *tag == cqe.command_id) 729a0fa9647SJens Axboe *tag = -1; 730adf68f21SChristoph Hellwig 731aae239e1SChristoph Hellwig if (unlikely(cqe.command_id >= nvmeq->q_depth)) { 7321b3c47c1SSagi Grimberg dev_warn(nvmeq->dev->ctrl.device, 733aae239e1SChristoph Hellwig "invalid id %d completed on queue %d\n", 734aae239e1SChristoph Hellwig cqe.command_id, le16_to_cpu(cqe.sq_id)); 735aae239e1SChristoph Hellwig continue; 736aae239e1SChristoph Hellwig } 737aae239e1SChristoph Hellwig 738adf68f21SChristoph Hellwig /* 739adf68f21SChristoph Hellwig * AEN requests are special as they don't time out and can 740adf68f21SChristoph Hellwig * survive any kind of queue freeze and often don't respond to 741adf68f21SChristoph Hellwig * aborts. We don't even bother to allocate a struct request 742adf68f21SChristoph Hellwig * for them but rather special case them here. 743adf68f21SChristoph Hellwig */ 744adf68f21SChristoph Hellwig if (unlikely(nvmeq->qid == 0 && 745adf68f21SChristoph Hellwig cqe.command_id >= NVME_AQ_BLKMQ_DEPTH)) { 746adf68f21SChristoph Hellwig nvme_complete_async_event(nvmeq->dev, &cqe); 747adf68f21SChristoph Hellwig continue; 748adf68f21SChristoph Hellwig } 749adf68f21SChristoph Hellwig 750eee417b0SChristoph Hellwig req = blk_mq_tag_to_rq(*nvmeq->tags, cqe.command_id); 7511cb3cce5SChristoph Hellwig if (req->cmd_type == REQ_TYPE_DRV_PRIV && req->special) 7521cb3cce5SChristoph Hellwig memcpy(req->special, &cqe, sizeof(cqe)); 753eee417b0SChristoph Hellwig blk_mq_complete_request(req, status >> 1); 754eee417b0SChristoph Hellwig 75557dacad5SJay Sternberg } 75657dacad5SJay Sternberg 75757dacad5SJay Sternberg /* If the controller ignores the cq head doorbell and continuously 75857dacad5SJay Sternberg * writes to the queue, it is theoretically possible to wrap around 75957dacad5SJay Sternberg * the queue twice and mistakenly return IRQ_NONE. Linux only 76057dacad5SJay Sternberg * requires that 0.1% of your interrupts are handled, so this isn't 76157dacad5SJay Sternberg * a big problem. 76257dacad5SJay Sternberg */ 76357dacad5SJay Sternberg if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) 764a0fa9647SJens Axboe return; 76557dacad5SJay Sternberg 766604e8c8dSKeith Busch if (likely(nvmeq->cq_vector >= 0)) 76757dacad5SJay Sternberg writel(head, nvmeq->q_db + nvmeq->dev->db_stride); 76857dacad5SJay Sternberg nvmeq->cq_head = head; 76957dacad5SJay Sternberg nvmeq->cq_phase = phase; 77057dacad5SJay Sternberg 77157dacad5SJay Sternberg nvmeq->cqe_seen = 1; 772a0fa9647SJens Axboe } 773a0fa9647SJens Axboe 774a0fa9647SJens Axboe static void nvme_process_cq(struct nvme_queue *nvmeq) 775a0fa9647SJens Axboe { 776a0fa9647SJens Axboe __nvme_process_cq(nvmeq, NULL); 77757dacad5SJay Sternberg } 77857dacad5SJay Sternberg 77957dacad5SJay Sternberg static irqreturn_t nvme_irq(int irq, void *data) 78057dacad5SJay Sternberg { 78157dacad5SJay Sternberg irqreturn_t result; 78257dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 78357dacad5SJay Sternberg spin_lock(&nvmeq->q_lock); 78457dacad5SJay Sternberg nvme_process_cq(nvmeq); 78557dacad5SJay Sternberg result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; 78657dacad5SJay Sternberg nvmeq->cqe_seen = 0; 78757dacad5SJay Sternberg spin_unlock(&nvmeq->q_lock); 78857dacad5SJay Sternberg return result; 78957dacad5SJay Sternberg } 79057dacad5SJay Sternberg 79157dacad5SJay Sternberg static irqreturn_t nvme_irq_check(int irq, void *data) 79257dacad5SJay Sternberg { 79357dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 79457dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; 79557dacad5SJay Sternberg if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) 79657dacad5SJay Sternberg return IRQ_NONE; 79757dacad5SJay Sternberg return IRQ_WAKE_THREAD; 79857dacad5SJay Sternberg } 79957dacad5SJay Sternberg 800a0fa9647SJens Axboe static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) 801a0fa9647SJens Axboe { 802a0fa9647SJens Axboe struct nvme_queue *nvmeq = hctx->driver_data; 803a0fa9647SJens Axboe 804a0fa9647SJens Axboe if ((le16_to_cpu(nvmeq->cqes[nvmeq->cq_head].status) & 1) == 805a0fa9647SJens Axboe nvmeq->cq_phase) { 806a0fa9647SJens Axboe spin_lock_irq(&nvmeq->q_lock); 807a0fa9647SJens Axboe __nvme_process_cq(nvmeq, &tag); 808a0fa9647SJens Axboe spin_unlock_irq(&nvmeq->q_lock); 809a0fa9647SJens Axboe 810a0fa9647SJens Axboe if (tag == -1) 811a0fa9647SJens Axboe return 1; 812a0fa9647SJens Axboe } 813a0fa9647SJens Axboe 814a0fa9647SJens Axboe return 0; 815a0fa9647SJens Axboe } 816a0fa9647SJens Axboe 8179396dec9SChristoph Hellwig static void nvme_async_event_work(struct work_struct *work) 81857dacad5SJay Sternberg { 8199396dec9SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, async_work); 8209396dec9SChristoph Hellwig struct nvme_queue *nvmeq = dev->queues[0]; 82157dacad5SJay Sternberg struct nvme_command c; 82257dacad5SJay Sternberg 82357dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 82457dacad5SJay Sternberg c.common.opcode = nvme_admin_async_event; 82557dacad5SJay Sternberg 8269396dec9SChristoph Hellwig spin_lock_irq(&nvmeq->q_lock); 8279396dec9SChristoph Hellwig while (dev->ctrl.event_limit > 0) { 8289396dec9SChristoph Hellwig c.common.command_id = NVME_AQ_BLKMQ_DEPTH + 8299396dec9SChristoph Hellwig --dev->ctrl.event_limit; 8309396dec9SChristoph Hellwig __nvme_submit_cmd(nvmeq, &c); 8319396dec9SChristoph Hellwig } 8329396dec9SChristoph Hellwig spin_unlock_irq(&nvmeq->q_lock); 83357dacad5SJay Sternberg } 83457dacad5SJay Sternberg 83557dacad5SJay Sternberg static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) 83657dacad5SJay Sternberg { 83757dacad5SJay Sternberg struct nvme_command c; 83857dacad5SJay Sternberg 83957dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 84057dacad5SJay Sternberg c.delete_queue.opcode = opcode; 84157dacad5SJay Sternberg c.delete_queue.qid = cpu_to_le16(id); 84257dacad5SJay Sternberg 8431c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 84457dacad5SJay Sternberg } 84557dacad5SJay Sternberg 84657dacad5SJay Sternberg static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, 84757dacad5SJay Sternberg struct nvme_queue *nvmeq) 84857dacad5SJay Sternberg { 84957dacad5SJay Sternberg struct nvme_command c; 85057dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; 85157dacad5SJay Sternberg 85257dacad5SJay Sternberg /* 85357dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 85457dacad5SJay Sternberg * is attached to the request. 85557dacad5SJay Sternberg */ 85657dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 85757dacad5SJay Sternberg c.create_cq.opcode = nvme_admin_create_cq; 85857dacad5SJay Sternberg c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); 85957dacad5SJay Sternberg c.create_cq.cqid = cpu_to_le16(qid); 86057dacad5SJay Sternberg c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 86157dacad5SJay Sternberg c.create_cq.cq_flags = cpu_to_le16(flags); 86257dacad5SJay Sternberg c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); 86357dacad5SJay Sternberg 8641c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 86557dacad5SJay Sternberg } 86657dacad5SJay Sternberg 86757dacad5SJay Sternberg static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, 86857dacad5SJay Sternberg struct nvme_queue *nvmeq) 86957dacad5SJay Sternberg { 87057dacad5SJay Sternberg struct nvme_command c; 87157dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; 87257dacad5SJay Sternberg 87357dacad5SJay Sternberg /* 87457dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 87557dacad5SJay Sternberg * is attached to the request. 87657dacad5SJay Sternberg */ 87757dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 87857dacad5SJay Sternberg c.create_sq.opcode = nvme_admin_create_sq; 87957dacad5SJay Sternberg c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); 88057dacad5SJay Sternberg c.create_sq.sqid = cpu_to_le16(qid); 88157dacad5SJay Sternberg c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 88257dacad5SJay Sternberg c.create_sq.sq_flags = cpu_to_le16(flags); 88357dacad5SJay Sternberg c.create_sq.cqid = cpu_to_le16(qid); 88457dacad5SJay Sternberg 8851c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 88657dacad5SJay Sternberg } 88757dacad5SJay Sternberg 88857dacad5SJay Sternberg static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) 88957dacad5SJay Sternberg { 89057dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); 89157dacad5SJay Sternberg } 89257dacad5SJay Sternberg 89357dacad5SJay Sternberg static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) 89457dacad5SJay Sternberg { 89557dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); 89657dacad5SJay Sternberg } 89757dacad5SJay Sternberg 898e7a2a87dSChristoph Hellwig static void abort_endio(struct request *req, int error) 89957dacad5SJay Sternberg { 900f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 901f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq = iod->nvmeq; 902e7a2a87dSChristoph Hellwig u16 status = req->errors; 90357dacad5SJay Sternberg 9041cb3cce5SChristoph Hellwig dev_warn(nvmeq->dev->ctrl.device, "Abort status: 0x%x", status); 905e7a2a87dSChristoph Hellwig atomic_inc(&nvmeq->dev->ctrl.abort_limit); 906e7a2a87dSChristoph Hellwig blk_mq_free_request(req); 90757dacad5SJay Sternberg } 90857dacad5SJay Sternberg 90931c7c7d2SChristoph Hellwig static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) 91057dacad5SJay Sternberg { 911f4800d6dSChristoph Hellwig struct nvme_iod *iod = blk_mq_rq_to_pdu(req); 912f4800d6dSChristoph Hellwig struct nvme_queue *nvmeq = iod->nvmeq; 91357dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 91457dacad5SJay Sternberg struct request *abort_req; 91557dacad5SJay Sternberg struct nvme_command cmd; 91657dacad5SJay Sternberg 91731c7c7d2SChristoph Hellwig /* 918fd634f41SChristoph Hellwig * Shutdown immediately if controller times out while starting. The 919fd634f41SChristoph Hellwig * reset work will see the pci device disabled when it gets the forced 920fd634f41SChristoph Hellwig * cancellation error. All outstanding requests are completed on 921fd634f41SChristoph Hellwig * shutdown, so we return BLK_EH_HANDLED. 922fd634f41SChristoph Hellwig */ 923fd634f41SChristoph Hellwig if (test_bit(NVME_CTRL_RESETTING, &dev->flags)) { 9241b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 925fd634f41SChristoph Hellwig "I/O %d QID %d timeout, disable controller\n", 926fd634f41SChristoph Hellwig req->tag, nvmeq->qid); 927a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 928fd634f41SChristoph Hellwig req->errors = NVME_SC_CANCELLED; 929fd634f41SChristoph Hellwig return BLK_EH_HANDLED; 930fd634f41SChristoph Hellwig } 931fd634f41SChristoph Hellwig 932fd634f41SChristoph Hellwig /* 933e1569a16SKeith Busch * Shutdown the controller immediately and schedule a reset if the 934e1569a16SKeith Busch * command was already aborted once before and still hasn't been 935e1569a16SKeith Busch * returned to the driver, or if this is the admin queue. 93631c7c7d2SChristoph Hellwig */ 937f4800d6dSChristoph Hellwig if (!nvmeq->qid || iod->aborted) { 9381b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, 93957dacad5SJay Sternberg "I/O %d QID %d timeout, reset controller\n", 94057dacad5SJay Sternberg req->tag, nvmeq->qid); 941a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 942e1569a16SKeith Busch queue_work(nvme_workq, &dev->reset_work); 943e1569a16SKeith Busch 944e1569a16SKeith Busch /* 945e1569a16SKeith Busch * Mark the request as handled, since the inline shutdown 946e1569a16SKeith Busch * forces all outstanding requests to complete. 947e1569a16SKeith Busch */ 948e1569a16SKeith Busch req->errors = NVME_SC_CANCELLED; 949e1569a16SKeith Busch return BLK_EH_HANDLED; 95057dacad5SJay Sternberg } 95157dacad5SJay Sternberg 952f4800d6dSChristoph Hellwig iod->aborted = 1; 95357dacad5SJay Sternberg 954e7a2a87dSChristoph Hellwig if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) { 955e7a2a87dSChristoph Hellwig atomic_inc(&dev->ctrl.abort_limit); 956e7a2a87dSChristoph Hellwig return BLK_EH_RESET_TIMER; 957e7a2a87dSChristoph Hellwig } 95857dacad5SJay Sternberg 95957dacad5SJay Sternberg memset(&cmd, 0, sizeof(cmd)); 96057dacad5SJay Sternberg cmd.abort.opcode = nvme_admin_abort_cmd; 96157dacad5SJay Sternberg cmd.abort.cid = req->tag; 96257dacad5SJay Sternberg cmd.abort.sqid = cpu_to_le16(nvmeq->qid); 96357dacad5SJay Sternberg 9641b3c47c1SSagi Grimberg dev_warn(nvmeq->dev->ctrl.device, 9651b3c47c1SSagi Grimberg "I/O %d QID %d timeout, aborting\n", 96657dacad5SJay Sternberg req->tag, nvmeq->qid); 967e7a2a87dSChristoph Hellwig 968e7a2a87dSChristoph Hellwig abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd, 9696f3b0e8bSChristoph Hellwig BLK_MQ_REQ_NOWAIT); 9706bf25d16SChristoph Hellwig if (IS_ERR(abort_req)) { 9716bf25d16SChristoph Hellwig atomic_inc(&dev->ctrl.abort_limit); 97231c7c7d2SChristoph Hellwig return BLK_EH_RESET_TIMER; 97357dacad5SJay Sternberg } 97457dacad5SJay Sternberg 975e7a2a87dSChristoph Hellwig abort_req->timeout = ADMIN_TIMEOUT; 976e7a2a87dSChristoph Hellwig abort_req->end_io_data = NULL; 977e7a2a87dSChristoph Hellwig blk_execute_rq_nowait(abort_req->q, NULL, abort_req, 0, abort_endio); 97857dacad5SJay Sternberg 97957dacad5SJay Sternberg /* 98057dacad5SJay Sternberg * The aborted req will be completed on receiving the abort req. 98157dacad5SJay Sternberg * We enable the timer again. If hit twice, it'll cause a device reset, 98257dacad5SJay Sternberg * as the device then is in a faulty state. 98357dacad5SJay Sternberg */ 98457dacad5SJay Sternberg return BLK_EH_RESET_TIMER; 98557dacad5SJay Sternberg } 98657dacad5SJay Sternberg 98757dacad5SJay Sternberg static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved) 98857dacad5SJay Sternberg { 98957dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 990aae239e1SChristoph Hellwig int status; 99157dacad5SJay Sternberg 99257dacad5SJay Sternberg if (!blk_mq_request_started(req)) 99357dacad5SJay Sternberg return; 99457dacad5SJay Sternberg 9951b3c47c1SSagi Grimberg dev_warn(nvmeq->dev->ctrl.device, 996aae239e1SChristoph Hellwig "Cancelling I/O %d QID %d\n", req->tag, nvmeq->qid); 99757dacad5SJay Sternberg 9981d49c38cSKeith Busch status = NVME_SC_ABORT_REQ; 99957dacad5SJay Sternberg if (blk_queue_dying(req->q)) 1000aae239e1SChristoph Hellwig status |= NVME_SC_DNR; 1001aae239e1SChristoph Hellwig blk_mq_complete_request(req, status); 100257dacad5SJay Sternberg } 100357dacad5SJay Sternberg 100457dacad5SJay Sternberg static void nvme_free_queue(struct nvme_queue *nvmeq) 100557dacad5SJay Sternberg { 100657dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), 100757dacad5SJay Sternberg (void *)nvmeq->cqes, nvmeq->cq_dma_addr); 100857dacad5SJay Sternberg if (nvmeq->sq_cmds) 100957dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), 101057dacad5SJay Sternberg nvmeq->sq_cmds, nvmeq->sq_dma_addr); 101157dacad5SJay Sternberg kfree(nvmeq); 101257dacad5SJay Sternberg } 101357dacad5SJay Sternberg 101457dacad5SJay Sternberg static void nvme_free_queues(struct nvme_dev *dev, int lowest) 101557dacad5SJay Sternberg { 101657dacad5SJay Sternberg int i; 101757dacad5SJay Sternberg 101857dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= lowest; i--) { 101957dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 102057dacad5SJay Sternberg dev->queue_count--; 102157dacad5SJay Sternberg dev->queues[i] = NULL; 102257dacad5SJay Sternberg nvme_free_queue(nvmeq); 102357dacad5SJay Sternberg } 102457dacad5SJay Sternberg } 102557dacad5SJay Sternberg 102657dacad5SJay Sternberg /** 102757dacad5SJay Sternberg * nvme_suspend_queue - put queue into suspended state 102857dacad5SJay Sternberg * @nvmeq - queue to suspend 102957dacad5SJay Sternberg */ 103057dacad5SJay Sternberg static int nvme_suspend_queue(struct nvme_queue *nvmeq) 103157dacad5SJay Sternberg { 103257dacad5SJay Sternberg int vector; 103357dacad5SJay Sternberg 103457dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 103557dacad5SJay Sternberg if (nvmeq->cq_vector == -1) { 103657dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 103757dacad5SJay Sternberg return 1; 103857dacad5SJay Sternberg } 103957dacad5SJay Sternberg vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; 104057dacad5SJay Sternberg nvmeq->dev->online_queues--; 104157dacad5SJay Sternberg nvmeq->cq_vector = -1; 104257dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 104357dacad5SJay Sternberg 10441c63dc66SChristoph Hellwig if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) 104525646264SKeith Busch blk_mq_stop_hw_queues(nvmeq->dev->ctrl.admin_q); 104657dacad5SJay Sternberg 104757dacad5SJay Sternberg irq_set_affinity_hint(vector, NULL); 104857dacad5SJay Sternberg free_irq(vector, nvmeq); 104957dacad5SJay Sternberg 105057dacad5SJay Sternberg return 0; 105157dacad5SJay Sternberg } 105257dacad5SJay Sternberg 105357dacad5SJay Sternberg static void nvme_clear_queue(struct nvme_queue *nvmeq) 105457dacad5SJay Sternberg { 105557dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 105657dacad5SJay Sternberg if (nvmeq->tags && *nvmeq->tags) 105757dacad5SJay Sternberg blk_mq_all_tag_busy_iter(*nvmeq->tags, nvme_cancel_queue_ios, nvmeq); 105857dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 105957dacad5SJay Sternberg } 106057dacad5SJay Sternberg 1061a5cdb68cSKeith Busch static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown) 106257dacad5SJay Sternberg { 1063a5cdb68cSKeith Busch struct nvme_queue *nvmeq = dev->queues[0]; 106457dacad5SJay Sternberg 106557dacad5SJay Sternberg if (!nvmeq) 106657dacad5SJay Sternberg return; 106757dacad5SJay Sternberg if (nvme_suspend_queue(nvmeq)) 106857dacad5SJay Sternberg return; 106957dacad5SJay Sternberg 1070a5cdb68cSKeith Busch if (shutdown) 1071a5cdb68cSKeith Busch nvme_shutdown_ctrl(&dev->ctrl); 1072a5cdb68cSKeith Busch else 1073a5cdb68cSKeith Busch nvme_disable_ctrl(&dev->ctrl, lo_hi_readq( 1074a5cdb68cSKeith Busch dev->bar + NVME_REG_CAP)); 107557dacad5SJay Sternberg 107657dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 107757dacad5SJay Sternberg nvme_process_cq(nvmeq); 107857dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 107957dacad5SJay Sternberg } 108057dacad5SJay Sternberg 108157dacad5SJay Sternberg static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, 108257dacad5SJay Sternberg int entry_size) 108357dacad5SJay Sternberg { 108457dacad5SJay Sternberg int q_depth = dev->q_depth; 10855fd4ce1bSChristoph Hellwig unsigned q_size_aligned = roundup(q_depth * entry_size, 10865fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 108757dacad5SJay Sternberg 108857dacad5SJay Sternberg if (q_size_aligned * nr_io_queues > dev->cmb_size) { 108957dacad5SJay Sternberg u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); 10905fd4ce1bSChristoph Hellwig mem_per_q = round_down(mem_per_q, dev->ctrl.page_size); 109157dacad5SJay Sternberg q_depth = div_u64(mem_per_q, entry_size); 109257dacad5SJay Sternberg 109357dacad5SJay Sternberg /* 109457dacad5SJay Sternberg * Ensure the reduced q_depth is above some threshold where it 109557dacad5SJay Sternberg * would be better to map queues in system memory with the 109657dacad5SJay Sternberg * original depth 109757dacad5SJay Sternberg */ 109857dacad5SJay Sternberg if (q_depth < 64) 109957dacad5SJay Sternberg return -ENOMEM; 110057dacad5SJay Sternberg } 110157dacad5SJay Sternberg 110257dacad5SJay Sternberg return q_depth; 110357dacad5SJay Sternberg } 110457dacad5SJay Sternberg 110557dacad5SJay Sternberg static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, 110657dacad5SJay Sternberg int qid, int depth) 110757dacad5SJay Sternberg { 110857dacad5SJay Sternberg if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { 11095fd4ce1bSChristoph Hellwig unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth), 11105fd4ce1bSChristoph Hellwig dev->ctrl.page_size); 111157dacad5SJay Sternberg nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; 111257dacad5SJay Sternberg nvmeq->sq_cmds_io = dev->cmb + offset; 111357dacad5SJay Sternberg } else { 111457dacad5SJay Sternberg nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), 111557dacad5SJay Sternberg &nvmeq->sq_dma_addr, GFP_KERNEL); 111657dacad5SJay Sternberg if (!nvmeq->sq_cmds) 111757dacad5SJay Sternberg return -ENOMEM; 111857dacad5SJay Sternberg } 111957dacad5SJay Sternberg 112057dacad5SJay Sternberg return 0; 112157dacad5SJay Sternberg } 112257dacad5SJay Sternberg 112357dacad5SJay Sternberg static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, 112457dacad5SJay Sternberg int depth) 112557dacad5SJay Sternberg { 112657dacad5SJay Sternberg struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL); 112757dacad5SJay Sternberg if (!nvmeq) 112857dacad5SJay Sternberg return NULL; 112957dacad5SJay Sternberg 113057dacad5SJay Sternberg nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), 113157dacad5SJay Sternberg &nvmeq->cq_dma_addr, GFP_KERNEL); 113257dacad5SJay Sternberg if (!nvmeq->cqes) 113357dacad5SJay Sternberg goto free_nvmeq; 113457dacad5SJay Sternberg 113557dacad5SJay Sternberg if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) 113657dacad5SJay Sternberg goto free_cqdma; 113757dacad5SJay Sternberg 113857dacad5SJay Sternberg nvmeq->q_dmadev = dev->dev; 113957dacad5SJay Sternberg nvmeq->dev = dev; 114057dacad5SJay Sternberg snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", 11411c63dc66SChristoph Hellwig dev->ctrl.instance, qid); 114257dacad5SJay Sternberg spin_lock_init(&nvmeq->q_lock); 114357dacad5SJay Sternberg nvmeq->cq_head = 0; 114457dacad5SJay Sternberg nvmeq->cq_phase = 1; 114557dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 114657dacad5SJay Sternberg nvmeq->q_depth = depth; 114757dacad5SJay Sternberg nvmeq->qid = qid; 114857dacad5SJay Sternberg nvmeq->cq_vector = -1; 114957dacad5SJay Sternberg dev->queues[qid] = nvmeq; 115057dacad5SJay Sternberg dev->queue_count++; 115157dacad5SJay Sternberg 115257dacad5SJay Sternberg return nvmeq; 115357dacad5SJay Sternberg 115457dacad5SJay Sternberg free_cqdma: 115557dacad5SJay Sternberg dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, 115657dacad5SJay Sternberg nvmeq->cq_dma_addr); 115757dacad5SJay Sternberg free_nvmeq: 115857dacad5SJay Sternberg kfree(nvmeq); 115957dacad5SJay Sternberg return NULL; 116057dacad5SJay Sternberg } 116157dacad5SJay Sternberg 116257dacad5SJay Sternberg static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, 116357dacad5SJay Sternberg const char *name) 116457dacad5SJay Sternberg { 116557dacad5SJay Sternberg if (use_threaded_interrupts) 116657dacad5SJay Sternberg return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, 116757dacad5SJay Sternberg nvme_irq_check, nvme_irq, IRQF_SHARED, 116857dacad5SJay Sternberg name, nvmeq); 116957dacad5SJay Sternberg return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, 117057dacad5SJay Sternberg IRQF_SHARED, name, nvmeq); 117157dacad5SJay Sternberg } 117257dacad5SJay Sternberg 117357dacad5SJay Sternberg static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) 117457dacad5SJay Sternberg { 117557dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 117657dacad5SJay Sternberg 117757dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 117857dacad5SJay Sternberg nvmeq->sq_tail = 0; 117957dacad5SJay Sternberg nvmeq->cq_head = 0; 118057dacad5SJay Sternberg nvmeq->cq_phase = 1; 118157dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 118257dacad5SJay Sternberg memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); 118357dacad5SJay Sternberg dev->online_queues++; 118457dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 118557dacad5SJay Sternberg } 118657dacad5SJay Sternberg 118757dacad5SJay Sternberg static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) 118857dacad5SJay Sternberg { 118957dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 119057dacad5SJay Sternberg int result; 119157dacad5SJay Sternberg 119257dacad5SJay Sternberg nvmeq->cq_vector = qid - 1; 119357dacad5SJay Sternberg result = adapter_alloc_cq(dev, qid, nvmeq); 119457dacad5SJay Sternberg if (result < 0) 119557dacad5SJay Sternberg return result; 119657dacad5SJay Sternberg 119757dacad5SJay Sternberg result = adapter_alloc_sq(dev, qid, nvmeq); 119857dacad5SJay Sternberg if (result < 0) 119957dacad5SJay Sternberg goto release_cq; 120057dacad5SJay Sternberg 120157dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 120257dacad5SJay Sternberg if (result < 0) 120357dacad5SJay Sternberg goto release_sq; 120457dacad5SJay Sternberg 120557dacad5SJay Sternberg nvme_init_queue(nvmeq, qid); 120657dacad5SJay Sternberg return result; 120757dacad5SJay Sternberg 120857dacad5SJay Sternberg release_sq: 120957dacad5SJay Sternberg adapter_delete_sq(dev, qid); 121057dacad5SJay Sternberg release_cq: 121157dacad5SJay Sternberg adapter_delete_cq(dev, qid); 121257dacad5SJay Sternberg return result; 121357dacad5SJay Sternberg } 121457dacad5SJay Sternberg 121557dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_admin_ops = { 121657dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 1217eee417b0SChristoph Hellwig .complete = nvme_complete_rq, 121857dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 121957dacad5SJay Sternberg .init_hctx = nvme_admin_init_hctx, 122057dacad5SJay Sternberg .exit_hctx = nvme_admin_exit_hctx, 122157dacad5SJay Sternberg .init_request = nvme_admin_init_request, 122257dacad5SJay Sternberg .timeout = nvme_timeout, 122357dacad5SJay Sternberg }; 122457dacad5SJay Sternberg 122557dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_ops = { 122657dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 1227eee417b0SChristoph Hellwig .complete = nvme_complete_rq, 122857dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 122957dacad5SJay Sternberg .init_hctx = nvme_init_hctx, 123057dacad5SJay Sternberg .init_request = nvme_init_request, 123157dacad5SJay Sternberg .timeout = nvme_timeout, 1232a0fa9647SJens Axboe .poll = nvme_poll, 123357dacad5SJay Sternberg }; 123457dacad5SJay Sternberg 123557dacad5SJay Sternberg static void nvme_dev_remove_admin(struct nvme_dev *dev) 123657dacad5SJay Sternberg { 12371c63dc66SChristoph Hellwig if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) { 12381c63dc66SChristoph Hellwig blk_cleanup_queue(dev->ctrl.admin_q); 123957dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 124057dacad5SJay Sternberg } 124157dacad5SJay Sternberg } 124257dacad5SJay Sternberg 124357dacad5SJay Sternberg static int nvme_alloc_admin_tags(struct nvme_dev *dev) 124457dacad5SJay Sternberg { 12451c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q) { 124657dacad5SJay Sternberg dev->admin_tagset.ops = &nvme_mq_admin_ops; 124757dacad5SJay Sternberg dev->admin_tagset.nr_hw_queues = 1; 1248e3e9d50cSKeith Busch 1249e3e9d50cSKeith Busch /* 1250e3e9d50cSKeith Busch * Subtract one to leave an empty queue entry for 'Full Queue' 1251e3e9d50cSKeith Busch * condition. See NVM-Express 1.2 specification, section 4.1.2. 1252e3e9d50cSKeith Busch */ 1253e3e9d50cSKeith Busch dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH - 1; 125457dacad5SJay Sternberg dev->admin_tagset.timeout = ADMIN_TIMEOUT; 125557dacad5SJay Sternberg dev->admin_tagset.numa_node = dev_to_node(dev->dev); 125657dacad5SJay Sternberg dev->admin_tagset.cmd_size = nvme_cmd_size(dev); 125757dacad5SJay Sternberg dev->admin_tagset.driver_data = dev; 125857dacad5SJay Sternberg 125957dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->admin_tagset)) 126057dacad5SJay Sternberg return -ENOMEM; 126157dacad5SJay Sternberg 12621c63dc66SChristoph Hellwig dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); 12631c63dc66SChristoph Hellwig if (IS_ERR(dev->ctrl.admin_q)) { 126457dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 126557dacad5SJay Sternberg return -ENOMEM; 126657dacad5SJay Sternberg } 12671c63dc66SChristoph Hellwig if (!blk_get_queue(dev->ctrl.admin_q)) { 126857dacad5SJay Sternberg nvme_dev_remove_admin(dev); 12691c63dc66SChristoph Hellwig dev->ctrl.admin_q = NULL; 127057dacad5SJay Sternberg return -ENODEV; 127157dacad5SJay Sternberg } 127257dacad5SJay Sternberg } else 127325646264SKeith Busch blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true); 127457dacad5SJay Sternberg 127557dacad5SJay Sternberg return 0; 127657dacad5SJay Sternberg } 127757dacad5SJay Sternberg 127857dacad5SJay Sternberg static int nvme_configure_admin_queue(struct nvme_dev *dev) 127957dacad5SJay Sternberg { 128057dacad5SJay Sternberg int result; 128157dacad5SJay Sternberg u32 aqa; 12827a67cbeaSChristoph Hellwig u64 cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 128357dacad5SJay Sternberg struct nvme_queue *nvmeq; 128457dacad5SJay Sternberg 12857a67cbeaSChristoph Hellwig dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1) ? 128657dacad5SJay Sternberg NVME_CAP_NSSRC(cap) : 0; 128757dacad5SJay Sternberg 12887a67cbeaSChristoph Hellwig if (dev->subsystem && 12897a67cbeaSChristoph Hellwig (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO)) 12907a67cbeaSChristoph Hellwig writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS); 129157dacad5SJay Sternberg 12925fd4ce1bSChristoph Hellwig result = nvme_disable_ctrl(&dev->ctrl, cap); 129357dacad5SJay Sternberg if (result < 0) 129457dacad5SJay Sternberg return result; 129557dacad5SJay Sternberg 129657dacad5SJay Sternberg nvmeq = dev->queues[0]; 129757dacad5SJay Sternberg if (!nvmeq) { 129857dacad5SJay Sternberg nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); 129957dacad5SJay Sternberg if (!nvmeq) 130057dacad5SJay Sternberg return -ENOMEM; 130157dacad5SJay Sternberg } 130257dacad5SJay Sternberg 130357dacad5SJay Sternberg aqa = nvmeq->q_depth - 1; 130457dacad5SJay Sternberg aqa |= aqa << 16; 130557dacad5SJay Sternberg 13067a67cbeaSChristoph Hellwig writel(aqa, dev->bar + NVME_REG_AQA); 13077a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ); 13087a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ); 130957dacad5SJay Sternberg 13105fd4ce1bSChristoph Hellwig result = nvme_enable_ctrl(&dev->ctrl, cap); 131157dacad5SJay Sternberg if (result) 131257dacad5SJay Sternberg goto free_nvmeq; 131357dacad5SJay Sternberg 131457dacad5SJay Sternberg nvmeq->cq_vector = 0; 131557dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 131657dacad5SJay Sternberg if (result) { 131757dacad5SJay Sternberg nvmeq->cq_vector = -1; 131857dacad5SJay Sternberg goto free_nvmeq; 131957dacad5SJay Sternberg } 132057dacad5SJay Sternberg 132157dacad5SJay Sternberg return result; 132257dacad5SJay Sternberg 132357dacad5SJay Sternberg free_nvmeq: 132457dacad5SJay Sternberg nvme_free_queues(dev, 0); 132557dacad5SJay Sternberg return result; 132657dacad5SJay Sternberg } 132757dacad5SJay Sternberg 13282d55cd5fSChristoph Hellwig static void nvme_watchdog_timer(unsigned long data) 132957dacad5SJay Sternberg { 13302d55cd5fSChristoph Hellwig struct nvme_dev *dev = (struct nvme_dev *)data; 13317a67cbeaSChristoph Hellwig u32 csts = readl(dev->bar + NVME_REG_CSTS); 133257dacad5SJay Sternberg 1333846cc05fSChristoph Hellwig /* 1334846cc05fSChristoph Hellwig * Skip controllers currently under reset. 1335846cc05fSChristoph Hellwig */ 13362d55cd5fSChristoph Hellwig if (!work_pending(&dev->reset_work) && !work_busy(&dev->reset_work) && 13372d55cd5fSChristoph Hellwig ((csts & NVME_CSTS_CFS) || 13382d55cd5fSChristoph Hellwig (dev->subsystem && (csts & NVME_CSTS_NSSRO)))) { 1339846cc05fSChristoph Hellwig if (queue_work(nvme_workq, &dev->reset_work)) { 13402d55cd5fSChristoph Hellwig dev_warn(dev->dev, 13412d55cd5fSChristoph Hellwig "Failed status: 0x%x, reset controller.\n", 13422d55cd5fSChristoph Hellwig csts); 134357dacad5SJay Sternberg } 13442d55cd5fSChristoph Hellwig return; 134557dacad5SJay Sternberg } 13462d55cd5fSChristoph Hellwig 13472d55cd5fSChristoph Hellwig mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ)); 134857dacad5SJay Sternberg } 134957dacad5SJay Sternberg 1350749941f2SChristoph Hellwig static int nvme_create_io_queues(struct nvme_dev *dev) 135157dacad5SJay Sternberg { 1352949928c1SKeith Busch unsigned i, max; 1353749941f2SChristoph Hellwig int ret = 0; 135457dacad5SJay Sternberg 1355749941f2SChristoph Hellwig for (i = dev->queue_count; i <= dev->max_qid; i++) { 1356749941f2SChristoph Hellwig if (!nvme_alloc_queue(dev, i, dev->q_depth)) { 1357749941f2SChristoph Hellwig ret = -ENOMEM; 135857dacad5SJay Sternberg break; 1359749941f2SChristoph Hellwig } 1360749941f2SChristoph Hellwig } 136157dacad5SJay Sternberg 1362949928c1SKeith Busch max = min(dev->max_qid, dev->queue_count - 1); 1363949928c1SKeith Busch for (i = dev->online_queues; i <= max; i++) { 1364749941f2SChristoph Hellwig ret = nvme_create_queue(dev->queues[i], i); 1365749941f2SChristoph Hellwig if (ret) { 136657dacad5SJay Sternberg nvme_free_queues(dev, i); 136757dacad5SJay Sternberg break; 136857dacad5SJay Sternberg } 136957dacad5SJay Sternberg } 137057dacad5SJay Sternberg 1371749941f2SChristoph Hellwig /* 1372749941f2SChristoph Hellwig * Ignore failing Create SQ/CQ commands, we can continue with less 1373749941f2SChristoph Hellwig * than the desired aount of queues, and even a controller without 1374749941f2SChristoph Hellwig * I/O queues an still be used to issue admin commands. This might 1375749941f2SChristoph Hellwig * be useful to upgrade a buggy firmware for example. 1376749941f2SChristoph Hellwig */ 1377749941f2SChristoph Hellwig return ret >= 0 ? 0 : ret; 137857dacad5SJay Sternberg } 137957dacad5SJay Sternberg 138057dacad5SJay Sternberg static void __iomem *nvme_map_cmb(struct nvme_dev *dev) 138157dacad5SJay Sternberg { 138257dacad5SJay Sternberg u64 szu, size, offset; 138357dacad5SJay Sternberg u32 cmbloc; 138457dacad5SJay Sternberg resource_size_t bar_size; 138557dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 138657dacad5SJay Sternberg void __iomem *cmb; 138757dacad5SJay Sternberg dma_addr_t dma_addr; 138857dacad5SJay Sternberg 138957dacad5SJay Sternberg if (!use_cmb_sqes) 139057dacad5SJay Sternberg return NULL; 139157dacad5SJay Sternberg 13927a67cbeaSChristoph Hellwig dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); 139357dacad5SJay Sternberg if (!(NVME_CMB_SZ(dev->cmbsz))) 139457dacad5SJay Sternberg return NULL; 139557dacad5SJay Sternberg 13967a67cbeaSChristoph Hellwig cmbloc = readl(dev->bar + NVME_REG_CMBLOC); 139757dacad5SJay Sternberg 139857dacad5SJay Sternberg szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); 139957dacad5SJay Sternberg size = szu * NVME_CMB_SZ(dev->cmbsz); 140057dacad5SJay Sternberg offset = szu * NVME_CMB_OFST(cmbloc); 140157dacad5SJay Sternberg bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc)); 140257dacad5SJay Sternberg 140357dacad5SJay Sternberg if (offset > bar_size) 140457dacad5SJay Sternberg return NULL; 140557dacad5SJay Sternberg 140657dacad5SJay Sternberg /* 140757dacad5SJay Sternberg * Controllers may support a CMB size larger than their BAR, 140857dacad5SJay Sternberg * for example, due to being behind a bridge. Reduce the CMB to 140957dacad5SJay Sternberg * the reported size of the BAR 141057dacad5SJay Sternberg */ 141157dacad5SJay Sternberg if (size > bar_size - offset) 141257dacad5SJay Sternberg size = bar_size - offset; 141357dacad5SJay Sternberg 141457dacad5SJay Sternberg dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset; 141557dacad5SJay Sternberg cmb = ioremap_wc(dma_addr, size); 141657dacad5SJay Sternberg if (!cmb) 141757dacad5SJay Sternberg return NULL; 141857dacad5SJay Sternberg 141957dacad5SJay Sternberg dev->cmb_dma_addr = dma_addr; 142057dacad5SJay Sternberg dev->cmb_size = size; 142157dacad5SJay Sternberg return cmb; 142257dacad5SJay Sternberg } 142357dacad5SJay Sternberg 142457dacad5SJay Sternberg static inline void nvme_release_cmb(struct nvme_dev *dev) 142557dacad5SJay Sternberg { 142657dacad5SJay Sternberg if (dev->cmb) { 142757dacad5SJay Sternberg iounmap(dev->cmb); 142857dacad5SJay Sternberg dev->cmb = NULL; 142957dacad5SJay Sternberg } 143057dacad5SJay Sternberg } 143157dacad5SJay Sternberg 143257dacad5SJay Sternberg static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) 143357dacad5SJay Sternberg { 143457dacad5SJay Sternberg return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); 143557dacad5SJay Sternberg } 143657dacad5SJay Sternberg 143757dacad5SJay Sternberg static int nvme_setup_io_queues(struct nvme_dev *dev) 143857dacad5SJay Sternberg { 143957dacad5SJay Sternberg struct nvme_queue *adminq = dev->queues[0]; 144057dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 144157dacad5SJay Sternberg int result, i, vecs, nr_io_queues, size; 144257dacad5SJay Sternberg 144357dacad5SJay Sternberg nr_io_queues = num_possible_cpus(); 14449a0be7abSChristoph Hellwig result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues); 14459a0be7abSChristoph Hellwig if (result < 0) 144657dacad5SJay Sternberg return result; 14479a0be7abSChristoph Hellwig 14489a0be7abSChristoph Hellwig /* 14499a0be7abSChristoph Hellwig * Degraded controllers might return an error when setting the queue 14509a0be7abSChristoph Hellwig * count. We still want to be able to bring them online and offer 14519a0be7abSChristoph Hellwig * access to the admin queue, as that might be only way to fix them up. 14529a0be7abSChristoph Hellwig */ 14539a0be7abSChristoph Hellwig if (result > 0) { 14541b3c47c1SSagi Grimberg dev_err(dev->ctrl.device, 14551b3c47c1SSagi Grimberg "Could not set queue count (%d)\n", result); 14569a0be7abSChristoph Hellwig nr_io_queues = 0; 14579a0be7abSChristoph Hellwig result = 0; 14589a0be7abSChristoph Hellwig } 145957dacad5SJay Sternberg 146057dacad5SJay Sternberg if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { 146157dacad5SJay Sternberg result = nvme_cmb_qdepth(dev, nr_io_queues, 146257dacad5SJay Sternberg sizeof(struct nvme_command)); 146357dacad5SJay Sternberg if (result > 0) 146457dacad5SJay Sternberg dev->q_depth = result; 146557dacad5SJay Sternberg else 146657dacad5SJay Sternberg nvme_release_cmb(dev); 146757dacad5SJay Sternberg } 146857dacad5SJay Sternberg 146957dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 147057dacad5SJay Sternberg if (size > 8192) { 147157dacad5SJay Sternberg iounmap(dev->bar); 147257dacad5SJay Sternberg do { 147357dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), size); 147457dacad5SJay Sternberg if (dev->bar) 147557dacad5SJay Sternberg break; 147657dacad5SJay Sternberg if (!--nr_io_queues) 147757dacad5SJay Sternberg return -ENOMEM; 147857dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 147957dacad5SJay Sternberg } while (1); 14807a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 148157dacad5SJay Sternberg adminq->q_db = dev->dbs; 148257dacad5SJay Sternberg } 148357dacad5SJay Sternberg 148457dacad5SJay Sternberg /* Deregister the admin queue's interrupt */ 148557dacad5SJay Sternberg free_irq(dev->entry[0].vector, adminq); 148657dacad5SJay Sternberg 148757dacad5SJay Sternberg /* 148857dacad5SJay Sternberg * If we enable msix early due to not intx, disable it again before 148957dacad5SJay Sternberg * setting up the full range we need. 149057dacad5SJay Sternberg */ 149157dacad5SJay Sternberg if (!pdev->irq) 149257dacad5SJay Sternberg pci_disable_msix(pdev); 149357dacad5SJay Sternberg 149457dacad5SJay Sternberg for (i = 0; i < nr_io_queues; i++) 149557dacad5SJay Sternberg dev->entry[i].entry = i; 149657dacad5SJay Sternberg vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); 149757dacad5SJay Sternberg if (vecs < 0) { 149857dacad5SJay Sternberg vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); 149957dacad5SJay Sternberg if (vecs < 0) { 150057dacad5SJay Sternberg vecs = 1; 150157dacad5SJay Sternberg } else { 150257dacad5SJay Sternberg for (i = 0; i < vecs; i++) 150357dacad5SJay Sternberg dev->entry[i].vector = i + pdev->irq; 150457dacad5SJay Sternberg } 150557dacad5SJay Sternberg } 150657dacad5SJay Sternberg 150757dacad5SJay Sternberg /* 150857dacad5SJay Sternberg * Should investigate if there's a performance win from allocating 150957dacad5SJay Sternberg * more queues than interrupt vectors; it might allow the submission 151057dacad5SJay Sternberg * path to scale better, even if the receive path is limited by the 151157dacad5SJay Sternberg * number of interrupts. 151257dacad5SJay Sternberg */ 151357dacad5SJay Sternberg nr_io_queues = vecs; 151457dacad5SJay Sternberg dev->max_qid = nr_io_queues; 151557dacad5SJay Sternberg 151657dacad5SJay Sternberg result = queue_request_irq(dev, adminq, adminq->irqname); 151757dacad5SJay Sternberg if (result) { 151857dacad5SJay Sternberg adminq->cq_vector = -1; 151957dacad5SJay Sternberg goto free_queues; 152057dacad5SJay Sternberg } 1521749941f2SChristoph Hellwig return nvme_create_io_queues(dev); 152257dacad5SJay Sternberg 152357dacad5SJay Sternberg free_queues: 152457dacad5SJay Sternberg nvme_free_queues(dev, 1); 152557dacad5SJay Sternberg return result; 152657dacad5SJay Sternberg } 152757dacad5SJay Sternberg 152857dacad5SJay Sternberg static void nvme_set_irq_hints(struct nvme_dev *dev) 152957dacad5SJay Sternberg { 153057dacad5SJay Sternberg struct nvme_queue *nvmeq; 153157dacad5SJay Sternberg int i; 153257dacad5SJay Sternberg 153357dacad5SJay Sternberg for (i = 0; i < dev->online_queues; i++) { 153457dacad5SJay Sternberg nvmeq = dev->queues[i]; 153557dacad5SJay Sternberg 153657dacad5SJay Sternberg if (!nvmeq->tags || !(*nvmeq->tags)) 153757dacad5SJay Sternberg continue; 153857dacad5SJay Sternberg 153957dacad5SJay Sternberg irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, 154057dacad5SJay Sternberg blk_mq_tags_cpumask(*nvmeq->tags)); 154157dacad5SJay Sternberg } 154257dacad5SJay Sternberg } 154357dacad5SJay Sternberg 154457dacad5SJay Sternberg static void nvme_dev_scan(struct work_struct *work) 154557dacad5SJay Sternberg { 154657dacad5SJay Sternberg struct nvme_dev *dev = container_of(work, struct nvme_dev, scan_work); 154757dacad5SJay Sternberg 154857dacad5SJay Sternberg if (!dev->tagset.tags) 154957dacad5SJay Sternberg return; 15505bae7f73SChristoph Hellwig nvme_scan_namespaces(&dev->ctrl); 155157dacad5SJay Sternberg nvme_set_irq_hints(dev); 155257dacad5SJay Sternberg } 155357dacad5SJay Sternberg 1554db3cbfffSKeith Busch static void nvme_del_queue_end(struct request *req, int error) 1555db3cbfffSKeith Busch { 1556db3cbfffSKeith Busch struct nvme_queue *nvmeq = req->end_io_data; 1557db3cbfffSKeith Busch 1558db3cbfffSKeith Busch blk_mq_free_request(req); 1559db3cbfffSKeith Busch complete(&nvmeq->dev->ioq_wait); 1560db3cbfffSKeith Busch } 1561db3cbfffSKeith Busch 1562db3cbfffSKeith Busch static void nvme_del_cq_end(struct request *req, int error) 1563db3cbfffSKeith Busch { 1564db3cbfffSKeith Busch struct nvme_queue *nvmeq = req->end_io_data; 1565db3cbfffSKeith Busch 1566db3cbfffSKeith Busch if (!error) { 1567db3cbfffSKeith Busch unsigned long flags; 1568db3cbfffSKeith Busch 1569db3cbfffSKeith Busch spin_lock_irqsave(&nvmeq->q_lock, flags); 1570db3cbfffSKeith Busch nvme_process_cq(nvmeq); 1571db3cbfffSKeith Busch spin_unlock_irqrestore(&nvmeq->q_lock, flags); 1572db3cbfffSKeith Busch } 1573db3cbfffSKeith Busch 1574db3cbfffSKeith Busch nvme_del_queue_end(req, error); 1575db3cbfffSKeith Busch } 1576db3cbfffSKeith Busch 1577db3cbfffSKeith Busch static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode) 1578db3cbfffSKeith Busch { 1579db3cbfffSKeith Busch struct request_queue *q = nvmeq->dev->ctrl.admin_q; 1580db3cbfffSKeith Busch struct request *req; 1581db3cbfffSKeith Busch struct nvme_command cmd; 1582db3cbfffSKeith Busch 1583db3cbfffSKeith Busch memset(&cmd, 0, sizeof(cmd)); 1584db3cbfffSKeith Busch cmd.delete_queue.opcode = opcode; 1585db3cbfffSKeith Busch cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid); 1586db3cbfffSKeith Busch 1587db3cbfffSKeith Busch req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT); 1588db3cbfffSKeith Busch if (IS_ERR(req)) 1589db3cbfffSKeith Busch return PTR_ERR(req); 1590db3cbfffSKeith Busch 1591db3cbfffSKeith Busch req->timeout = ADMIN_TIMEOUT; 1592db3cbfffSKeith Busch req->end_io_data = nvmeq; 1593db3cbfffSKeith Busch 1594db3cbfffSKeith Busch blk_execute_rq_nowait(q, NULL, req, false, 1595db3cbfffSKeith Busch opcode == nvme_admin_delete_cq ? 1596db3cbfffSKeith Busch nvme_del_cq_end : nvme_del_queue_end); 1597db3cbfffSKeith Busch return 0; 1598db3cbfffSKeith Busch } 1599db3cbfffSKeith Busch 1600db3cbfffSKeith Busch static void nvme_disable_io_queues(struct nvme_dev *dev) 1601db3cbfffSKeith Busch { 1602db3cbfffSKeith Busch int pass; 1603db3cbfffSKeith Busch unsigned long timeout; 1604db3cbfffSKeith Busch u8 opcode = nvme_admin_delete_sq; 1605db3cbfffSKeith Busch 1606db3cbfffSKeith Busch for (pass = 0; pass < 2; pass++) { 1607db3cbfffSKeith Busch int sent = 0, i = dev->queue_count - 1; 1608db3cbfffSKeith Busch 1609db3cbfffSKeith Busch reinit_completion(&dev->ioq_wait); 1610db3cbfffSKeith Busch retry: 1611db3cbfffSKeith Busch timeout = ADMIN_TIMEOUT; 1612db3cbfffSKeith Busch for (; i > 0; i--) { 1613db3cbfffSKeith Busch struct nvme_queue *nvmeq = dev->queues[i]; 1614db3cbfffSKeith Busch 1615db3cbfffSKeith Busch if (!pass) 1616db3cbfffSKeith Busch nvme_suspend_queue(nvmeq); 1617db3cbfffSKeith Busch if (nvme_delete_queue(nvmeq, opcode)) 1618db3cbfffSKeith Busch break; 1619db3cbfffSKeith Busch ++sent; 1620db3cbfffSKeith Busch } 1621db3cbfffSKeith Busch while (sent--) { 1622db3cbfffSKeith Busch timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout); 1623db3cbfffSKeith Busch if (timeout == 0) 1624db3cbfffSKeith Busch return; 1625db3cbfffSKeith Busch if (i) 1626db3cbfffSKeith Busch goto retry; 1627db3cbfffSKeith Busch } 1628db3cbfffSKeith Busch opcode = nvme_admin_delete_cq; 1629db3cbfffSKeith Busch } 1630db3cbfffSKeith Busch } 1631db3cbfffSKeith Busch 163257dacad5SJay Sternberg /* 163357dacad5SJay Sternberg * Return: error value if an error occurred setting up the queues or calling 163457dacad5SJay Sternberg * Identify Device. 0 if these succeeded, even if adding some of the 163557dacad5SJay Sternberg * namespaces failed. At the moment, these failures are silent. TBD which 163657dacad5SJay Sternberg * failures should be reported. 163757dacad5SJay Sternberg */ 163857dacad5SJay Sternberg static int nvme_dev_add(struct nvme_dev *dev) 163957dacad5SJay Sternberg { 16405bae7f73SChristoph Hellwig if (!dev->ctrl.tagset) { 164157dacad5SJay Sternberg dev->tagset.ops = &nvme_mq_ops; 164257dacad5SJay Sternberg dev->tagset.nr_hw_queues = dev->online_queues - 1; 164357dacad5SJay Sternberg dev->tagset.timeout = NVME_IO_TIMEOUT; 164457dacad5SJay Sternberg dev->tagset.numa_node = dev_to_node(dev->dev); 164557dacad5SJay Sternberg dev->tagset.queue_depth = 164657dacad5SJay Sternberg min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; 164757dacad5SJay Sternberg dev->tagset.cmd_size = nvme_cmd_size(dev); 164857dacad5SJay Sternberg dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; 164957dacad5SJay Sternberg dev->tagset.driver_data = dev; 165057dacad5SJay Sternberg 165157dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->tagset)) 165257dacad5SJay Sternberg return 0; 16535bae7f73SChristoph Hellwig dev->ctrl.tagset = &dev->tagset; 1654949928c1SKeith Busch } else { 1655949928c1SKeith Busch blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1); 1656949928c1SKeith Busch 1657949928c1SKeith Busch /* Free previously allocated queues that are no longer usable */ 1658949928c1SKeith Busch nvme_free_queues(dev, dev->online_queues); 165957dacad5SJay Sternberg } 1660949928c1SKeith Busch 166192f7a162SKeith Busch queue_work(nvme_workq, &dev->scan_work); 166257dacad5SJay Sternberg return 0; 166357dacad5SJay Sternberg } 166457dacad5SJay Sternberg 166557dacad5SJay Sternberg static int nvme_dev_map(struct nvme_dev *dev) 166657dacad5SJay Sternberg { 166757dacad5SJay Sternberg u64 cap; 166857dacad5SJay Sternberg int bars, result = -ENOMEM; 166957dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 167057dacad5SJay Sternberg 167157dacad5SJay Sternberg if (pci_enable_device_mem(pdev)) 167257dacad5SJay Sternberg return result; 167357dacad5SJay Sternberg 167457dacad5SJay Sternberg dev->entry[0].vector = pdev->irq; 167557dacad5SJay Sternberg pci_set_master(pdev); 167657dacad5SJay Sternberg bars = pci_select_bars(pdev, IORESOURCE_MEM); 167757dacad5SJay Sternberg if (!bars) 167857dacad5SJay Sternberg goto disable_pci; 167957dacad5SJay Sternberg 168057dacad5SJay Sternberg if (pci_request_selected_regions(pdev, bars, "nvme")) 168157dacad5SJay Sternberg goto disable_pci; 168257dacad5SJay Sternberg 168357dacad5SJay Sternberg if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && 168457dacad5SJay Sternberg dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) 168557dacad5SJay Sternberg goto disable; 168657dacad5SJay Sternberg 168757dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); 168857dacad5SJay Sternberg if (!dev->bar) 168957dacad5SJay Sternberg goto disable; 169057dacad5SJay Sternberg 16917a67cbeaSChristoph Hellwig if (readl(dev->bar + NVME_REG_CSTS) == -1) { 169257dacad5SJay Sternberg result = -ENODEV; 169357dacad5SJay Sternberg goto unmap; 169457dacad5SJay Sternberg } 169557dacad5SJay Sternberg 169657dacad5SJay Sternberg /* 169757dacad5SJay Sternberg * Some devices don't advertse INTx interrupts, pre-enable a single 169857dacad5SJay Sternberg * MSIX vec for setup. We'll adjust this later. 169957dacad5SJay Sternberg */ 170057dacad5SJay Sternberg if (!pdev->irq) { 170157dacad5SJay Sternberg result = pci_enable_msix(pdev, dev->entry, 1); 170257dacad5SJay Sternberg if (result < 0) 170357dacad5SJay Sternberg goto unmap; 170457dacad5SJay Sternberg } 170557dacad5SJay Sternberg 17067a67cbeaSChristoph Hellwig cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 17077a67cbeaSChristoph Hellwig 170857dacad5SJay Sternberg dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); 170957dacad5SJay Sternberg dev->db_stride = 1 << NVME_CAP_STRIDE(cap); 17107a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 17111f390c1fSStephan Günther 17121f390c1fSStephan Günther /* 17131f390c1fSStephan Günther * Temporary fix for the Apple controller found in the MacBook8,1 and 17141f390c1fSStephan Günther * some MacBook7,1 to avoid controller resets and data loss. 17151f390c1fSStephan Günther */ 17161f390c1fSStephan Günther if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) { 17171f390c1fSStephan Günther dev->q_depth = 2; 17181f390c1fSStephan Günther dev_warn(dev->dev, "detected Apple NVMe controller, set " 17191f390c1fSStephan Günther "queue depth=%u to work around controller resets\n", 17201f390c1fSStephan Günther dev->q_depth); 17211f390c1fSStephan Günther } 17221f390c1fSStephan Günther 17237a67cbeaSChristoph Hellwig if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2)) 172457dacad5SJay Sternberg dev->cmb = nvme_map_cmb(dev); 172557dacad5SJay Sternberg 1726a0a3408eSKeith Busch pci_enable_pcie_error_reporting(pdev); 1727a0a3408eSKeith Busch pci_save_state(pdev); 172857dacad5SJay Sternberg return 0; 172957dacad5SJay Sternberg 173057dacad5SJay Sternberg unmap: 173157dacad5SJay Sternberg iounmap(dev->bar); 173257dacad5SJay Sternberg dev->bar = NULL; 173357dacad5SJay Sternberg disable: 173457dacad5SJay Sternberg pci_release_regions(pdev); 173557dacad5SJay Sternberg disable_pci: 173657dacad5SJay Sternberg pci_disable_device(pdev); 173757dacad5SJay Sternberg return result; 173857dacad5SJay Sternberg } 173957dacad5SJay Sternberg 174057dacad5SJay Sternberg static void nvme_dev_unmap(struct nvme_dev *dev) 174157dacad5SJay Sternberg { 174257dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 174357dacad5SJay Sternberg 174457dacad5SJay Sternberg if (pdev->msi_enabled) 174557dacad5SJay Sternberg pci_disable_msi(pdev); 174657dacad5SJay Sternberg else if (pdev->msix_enabled) 174757dacad5SJay Sternberg pci_disable_msix(pdev); 174857dacad5SJay Sternberg 174957dacad5SJay Sternberg if (dev->bar) { 175057dacad5SJay Sternberg iounmap(dev->bar); 175157dacad5SJay Sternberg dev->bar = NULL; 175257dacad5SJay Sternberg pci_release_regions(pdev); 175357dacad5SJay Sternberg } 175457dacad5SJay Sternberg 1755a0a3408eSKeith Busch if (pci_is_enabled(pdev)) { 1756a0a3408eSKeith Busch pci_disable_pcie_error_reporting(pdev); 175757dacad5SJay Sternberg pci_disable_device(pdev); 175857dacad5SJay Sternberg } 1759a0a3408eSKeith Busch } 176057dacad5SJay Sternberg 1761a5cdb68cSKeith Busch static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown) 176257dacad5SJay Sternberg { 176357dacad5SJay Sternberg int i; 176457dacad5SJay Sternberg u32 csts = -1; 176557dacad5SJay Sternberg 17662d55cd5fSChristoph Hellwig del_timer_sync(&dev->watchdog_timer); 176757dacad5SJay Sternberg 176877bf25eaSKeith Busch mutex_lock(&dev->shutdown_lock); 176957dacad5SJay Sternberg if (dev->bar) { 177025646264SKeith Busch nvme_stop_queues(&dev->ctrl); 17717a67cbeaSChristoph Hellwig csts = readl(dev->bar + NVME_REG_CSTS); 177257dacad5SJay Sternberg } 177357dacad5SJay Sternberg if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) { 177457dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= 0; i--) { 177557dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 177657dacad5SJay Sternberg nvme_suspend_queue(nvmeq); 177757dacad5SJay Sternberg } 177857dacad5SJay Sternberg } else { 177957dacad5SJay Sternberg nvme_disable_io_queues(dev); 1780a5cdb68cSKeith Busch nvme_disable_admin_queue(dev, shutdown); 178157dacad5SJay Sternberg } 178257dacad5SJay Sternberg nvme_dev_unmap(dev); 178357dacad5SJay Sternberg 178457dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= 0; i--) 178557dacad5SJay Sternberg nvme_clear_queue(dev->queues[i]); 178677bf25eaSKeith Busch mutex_unlock(&dev->shutdown_lock); 178757dacad5SJay Sternberg } 178857dacad5SJay Sternberg 178957dacad5SJay Sternberg static int nvme_setup_prp_pools(struct nvme_dev *dev) 179057dacad5SJay Sternberg { 179157dacad5SJay Sternberg dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, 179257dacad5SJay Sternberg PAGE_SIZE, PAGE_SIZE, 0); 179357dacad5SJay Sternberg if (!dev->prp_page_pool) 179457dacad5SJay Sternberg return -ENOMEM; 179557dacad5SJay Sternberg 179657dacad5SJay Sternberg /* Optimisation for I/Os between 4k and 128k */ 179757dacad5SJay Sternberg dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, 179857dacad5SJay Sternberg 256, 256, 0); 179957dacad5SJay Sternberg if (!dev->prp_small_pool) { 180057dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 180157dacad5SJay Sternberg return -ENOMEM; 180257dacad5SJay Sternberg } 180357dacad5SJay Sternberg return 0; 180457dacad5SJay Sternberg } 180557dacad5SJay Sternberg 180657dacad5SJay Sternberg static void nvme_release_prp_pools(struct nvme_dev *dev) 180757dacad5SJay Sternberg { 180857dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 180957dacad5SJay Sternberg dma_pool_destroy(dev->prp_small_pool); 181057dacad5SJay Sternberg } 181157dacad5SJay Sternberg 18121673f1f0SChristoph Hellwig static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) 181357dacad5SJay Sternberg { 18141673f1f0SChristoph Hellwig struct nvme_dev *dev = to_nvme_dev(ctrl); 181557dacad5SJay Sternberg 181657dacad5SJay Sternberg put_device(dev->dev); 181757dacad5SJay Sternberg if (dev->tagset.tags) 181857dacad5SJay Sternberg blk_mq_free_tag_set(&dev->tagset); 18191c63dc66SChristoph Hellwig if (dev->ctrl.admin_q) 18201c63dc66SChristoph Hellwig blk_put_queue(dev->ctrl.admin_q); 182157dacad5SJay Sternberg kfree(dev->queues); 182257dacad5SJay Sternberg kfree(dev->entry); 182357dacad5SJay Sternberg kfree(dev); 182457dacad5SJay Sternberg } 182557dacad5SJay Sternberg 1826fd634f41SChristoph Hellwig static void nvme_reset_work(struct work_struct *work) 182757dacad5SJay Sternberg { 1828fd634f41SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work); 182957dacad5SJay Sternberg int result; 183057dacad5SJay Sternberg 1831fd634f41SChristoph Hellwig if (WARN_ON(test_bit(NVME_CTRL_RESETTING, &dev->flags))) 1832fd634f41SChristoph Hellwig goto out; 1833fd634f41SChristoph Hellwig 1834fd634f41SChristoph Hellwig /* 1835fd634f41SChristoph Hellwig * If we're called to reset a live controller first shut it down before 1836fd634f41SChristoph Hellwig * moving on. 1837fd634f41SChristoph Hellwig */ 1838fd634f41SChristoph Hellwig if (dev->bar) 1839a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 1840fd634f41SChristoph Hellwig 1841fd634f41SChristoph Hellwig set_bit(NVME_CTRL_RESETTING, &dev->flags); 1842fd634f41SChristoph Hellwig 184357dacad5SJay Sternberg result = nvme_dev_map(dev); 184457dacad5SJay Sternberg if (result) 184557dacad5SJay Sternberg goto out; 184657dacad5SJay Sternberg 184757dacad5SJay Sternberg result = nvme_configure_admin_queue(dev); 184857dacad5SJay Sternberg if (result) 184957dacad5SJay Sternberg goto unmap; 185057dacad5SJay Sternberg 185157dacad5SJay Sternberg nvme_init_queue(dev->queues[0], 0); 185257dacad5SJay Sternberg result = nvme_alloc_admin_tags(dev); 185357dacad5SJay Sternberg if (result) 185457dacad5SJay Sternberg goto disable; 185557dacad5SJay Sternberg 1856ce4541f4SChristoph Hellwig result = nvme_init_identify(&dev->ctrl); 1857ce4541f4SChristoph Hellwig if (result) 1858ce4541f4SChristoph Hellwig goto free_tags; 1859ce4541f4SChristoph Hellwig 186057dacad5SJay Sternberg result = nvme_setup_io_queues(dev); 186157dacad5SJay Sternberg if (result) 186257dacad5SJay Sternberg goto free_tags; 186357dacad5SJay Sternberg 1864adf68f21SChristoph Hellwig dev->ctrl.event_limit = NVME_NR_AEN_COMMANDS; 18659396dec9SChristoph Hellwig queue_work(nvme_workq, &dev->async_work); 186657dacad5SJay Sternberg 18672d55cd5fSChristoph Hellwig mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ)); 186857dacad5SJay Sternberg 186957dacad5SJay Sternberg /* 187057dacad5SJay Sternberg * Keep the controller around but remove all namespaces if we don't have 187157dacad5SJay Sternberg * any working I/O queue. 187257dacad5SJay Sternberg */ 187357dacad5SJay Sternberg if (dev->online_queues < 2) { 18741b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "IO queues not created\n"); 18755bae7f73SChristoph Hellwig nvme_remove_namespaces(&dev->ctrl); 187657dacad5SJay Sternberg } else { 187725646264SKeith Busch nvme_start_queues(&dev->ctrl); 187857dacad5SJay Sternberg nvme_dev_add(dev); 187957dacad5SJay Sternberg } 188057dacad5SJay Sternberg 1881fd634f41SChristoph Hellwig clear_bit(NVME_CTRL_RESETTING, &dev->flags); 188257dacad5SJay Sternberg return; 188357dacad5SJay Sternberg 188457dacad5SJay Sternberg free_tags: 188557dacad5SJay Sternberg nvme_dev_remove_admin(dev); 18861c63dc66SChristoph Hellwig blk_put_queue(dev->ctrl.admin_q); 18871c63dc66SChristoph Hellwig dev->ctrl.admin_q = NULL; 188857dacad5SJay Sternberg dev->queues[0]->tags = NULL; 188957dacad5SJay Sternberg disable: 1890a5cdb68cSKeith Busch nvme_disable_admin_queue(dev, false); 189157dacad5SJay Sternberg unmap: 189257dacad5SJay Sternberg nvme_dev_unmap(dev); 189357dacad5SJay Sternberg out: 18945c8809e6SChristoph Hellwig nvme_remove_dead_ctrl(dev); 189557dacad5SJay Sternberg } 189657dacad5SJay Sternberg 18975c8809e6SChristoph Hellwig static void nvme_remove_dead_ctrl_work(struct work_struct *work) 189857dacad5SJay Sternberg { 18995c8809e6SChristoph Hellwig struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work); 190057dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 190157dacad5SJay Sternberg 190257dacad5SJay Sternberg if (pci_get_drvdata(pdev)) 190357dacad5SJay Sternberg pci_stop_and_remove_bus_device_locked(pdev); 19041673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 190557dacad5SJay Sternberg } 190657dacad5SJay Sternberg 19075c8809e6SChristoph Hellwig static void nvme_remove_dead_ctrl(struct nvme_dev *dev) 190857dacad5SJay Sternberg { 19091b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "Removing after probe failure\n"); 19101673f1f0SChristoph Hellwig kref_get(&dev->ctrl.kref); 19115c8809e6SChristoph Hellwig if (!schedule_work(&dev->remove_work)) 19121673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 191357dacad5SJay Sternberg } 191457dacad5SJay Sternberg 191557dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev) 191657dacad5SJay Sternberg { 19171c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q || blk_queue_dying(dev->ctrl.admin_q)) 191857dacad5SJay Sternberg return -ENODEV; 191957dacad5SJay Sternberg 1920846cc05fSChristoph Hellwig if (!queue_work(nvme_workq, &dev->reset_work)) 1921846cc05fSChristoph Hellwig return -EBUSY; 192257dacad5SJay Sternberg 192357dacad5SJay Sternberg flush_work(&dev->reset_work); 192457dacad5SJay Sternberg return 0; 192557dacad5SJay Sternberg } 192657dacad5SJay Sternberg 19271c63dc66SChristoph Hellwig static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) 192857dacad5SJay Sternberg { 19291c63dc66SChristoph Hellwig *val = readl(to_nvme_dev(ctrl)->bar + off); 19301c63dc66SChristoph Hellwig return 0; 193157dacad5SJay Sternberg } 19321c63dc66SChristoph Hellwig 19335fd4ce1bSChristoph Hellwig static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val) 19345fd4ce1bSChristoph Hellwig { 19355fd4ce1bSChristoph Hellwig writel(val, to_nvme_dev(ctrl)->bar + off); 19365fd4ce1bSChristoph Hellwig return 0; 19375fd4ce1bSChristoph Hellwig } 19385fd4ce1bSChristoph Hellwig 19397fd8930fSChristoph Hellwig static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val) 19407fd8930fSChristoph Hellwig { 19417fd8930fSChristoph Hellwig *val = readq(to_nvme_dev(ctrl)->bar + off); 19427fd8930fSChristoph Hellwig return 0; 19437fd8930fSChristoph Hellwig } 19447fd8930fSChristoph Hellwig 19455bae7f73SChristoph Hellwig static bool nvme_pci_io_incapable(struct nvme_ctrl *ctrl) 19465bae7f73SChristoph Hellwig { 19475bae7f73SChristoph Hellwig struct nvme_dev *dev = to_nvme_dev(ctrl); 19485bae7f73SChristoph Hellwig 19495bae7f73SChristoph Hellwig return !dev->bar || dev->online_queues < 2; 19505bae7f73SChristoph Hellwig } 19515bae7f73SChristoph Hellwig 1952f3ca80fcSChristoph Hellwig static int nvme_pci_reset_ctrl(struct nvme_ctrl *ctrl) 1953f3ca80fcSChristoph Hellwig { 1954f3ca80fcSChristoph Hellwig return nvme_reset(to_nvme_dev(ctrl)); 1955f3ca80fcSChristoph Hellwig } 1956f3ca80fcSChristoph Hellwig 19571c63dc66SChristoph Hellwig static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { 1958e439bb12SSagi Grimberg .module = THIS_MODULE, 19591c63dc66SChristoph Hellwig .reg_read32 = nvme_pci_reg_read32, 19605fd4ce1bSChristoph Hellwig .reg_write32 = nvme_pci_reg_write32, 19617fd8930fSChristoph Hellwig .reg_read64 = nvme_pci_reg_read64, 19625bae7f73SChristoph Hellwig .io_incapable = nvme_pci_io_incapable, 1963f3ca80fcSChristoph Hellwig .reset_ctrl = nvme_pci_reset_ctrl, 19641673f1f0SChristoph Hellwig .free_ctrl = nvme_pci_free_ctrl, 19651c63dc66SChristoph Hellwig }; 196657dacad5SJay Sternberg 196757dacad5SJay Sternberg static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 196857dacad5SJay Sternberg { 196957dacad5SJay Sternberg int node, result = -ENOMEM; 197057dacad5SJay Sternberg struct nvme_dev *dev; 197157dacad5SJay Sternberg 197257dacad5SJay Sternberg node = dev_to_node(&pdev->dev); 197357dacad5SJay Sternberg if (node == NUMA_NO_NODE) 197457dacad5SJay Sternberg set_dev_node(&pdev->dev, 0); 197557dacad5SJay Sternberg 197657dacad5SJay Sternberg dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); 197757dacad5SJay Sternberg if (!dev) 197857dacad5SJay Sternberg return -ENOMEM; 197957dacad5SJay Sternberg dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry), 198057dacad5SJay Sternberg GFP_KERNEL, node); 198157dacad5SJay Sternberg if (!dev->entry) 198257dacad5SJay Sternberg goto free; 198357dacad5SJay Sternberg dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), 198457dacad5SJay Sternberg GFP_KERNEL, node); 198557dacad5SJay Sternberg if (!dev->queues) 198657dacad5SJay Sternberg goto free; 198757dacad5SJay Sternberg 198857dacad5SJay Sternberg dev->dev = get_device(&pdev->dev); 198957dacad5SJay Sternberg pci_set_drvdata(pdev, dev); 199057dacad5SJay Sternberg 199157dacad5SJay Sternberg INIT_WORK(&dev->scan_work, nvme_dev_scan); 1992f3ca80fcSChristoph Hellwig INIT_WORK(&dev->reset_work, nvme_reset_work); 19935c8809e6SChristoph Hellwig INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work); 19949396dec9SChristoph Hellwig INIT_WORK(&dev->async_work, nvme_async_event_work); 19952d55cd5fSChristoph Hellwig setup_timer(&dev->watchdog_timer, nvme_watchdog_timer, 19962d55cd5fSChristoph Hellwig (unsigned long)dev); 199777bf25eaSKeith Busch mutex_init(&dev->shutdown_lock); 1998db3cbfffSKeith Busch init_completion(&dev->ioq_wait); 1999f3ca80fcSChristoph Hellwig 2000f3ca80fcSChristoph Hellwig result = nvme_setup_prp_pools(dev); 2001f3ca80fcSChristoph Hellwig if (result) 2002f3ca80fcSChristoph Hellwig goto put_pci; 2003f3ca80fcSChristoph Hellwig 2004f3ca80fcSChristoph Hellwig result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops, 2005f3ca80fcSChristoph Hellwig id->driver_data); 2006f3ca80fcSChristoph Hellwig if (result) 2007f3ca80fcSChristoph Hellwig goto release_pools; 2008f3ca80fcSChristoph Hellwig 20091b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev)); 20101b3c47c1SSagi Grimberg 201192f7a162SKeith Busch queue_work(nvme_workq, &dev->reset_work); 201257dacad5SJay Sternberg return 0; 201357dacad5SJay Sternberg 201457dacad5SJay Sternberg release_pools: 201557dacad5SJay Sternberg nvme_release_prp_pools(dev); 201657dacad5SJay Sternberg put_pci: 201757dacad5SJay Sternberg put_device(dev->dev); 201857dacad5SJay Sternberg free: 201957dacad5SJay Sternberg kfree(dev->queues); 202057dacad5SJay Sternberg kfree(dev->entry); 202157dacad5SJay Sternberg kfree(dev); 202257dacad5SJay Sternberg return result; 202357dacad5SJay Sternberg } 202457dacad5SJay Sternberg 202557dacad5SJay Sternberg static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) 202657dacad5SJay Sternberg { 202757dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 202857dacad5SJay Sternberg 202957dacad5SJay Sternberg if (prepare) 2030a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 203157dacad5SJay Sternberg else 203292f7a162SKeith Busch queue_work(nvme_workq, &dev->reset_work); 203357dacad5SJay Sternberg } 203457dacad5SJay Sternberg 203557dacad5SJay Sternberg static void nvme_shutdown(struct pci_dev *pdev) 203657dacad5SJay Sternberg { 203757dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 2038a5cdb68cSKeith Busch nvme_dev_disable(dev, true); 203957dacad5SJay Sternberg } 204057dacad5SJay Sternberg 204157dacad5SJay Sternberg static void nvme_remove(struct pci_dev *pdev) 204257dacad5SJay Sternberg { 204357dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 204457dacad5SJay Sternberg 20452d55cd5fSChristoph Hellwig del_timer_sync(&dev->watchdog_timer); 204657dacad5SJay Sternberg 204757dacad5SJay Sternberg pci_set_drvdata(pdev, NULL); 20489396dec9SChristoph Hellwig flush_work(&dev->async_work); 204957dacad5SJay Sternberg flush_work(&dev->reset_work); 205057dacad5SJay Sternberg flush_work(&dev->scan_work); 20515bae7f73SChristoph Hellwig nvme_remove_namespaces(&dev->ctrl); 205253029b04SKeith Busch nvme_uninit_ctrl(&dev->ctrl); 2053a5cdb68cSKeith Busch nvme_dev_disable(dev, true); 205457dacad5SJay Sternberg nvme_dev_remove_admin(dev); 205557dacad5SJay Sternberg nvme_free_queues(dev, 0); 205657dacad5SJay Sternberg nvme_release_cmb(dev); 205757dacad5SJay Sternberg nvme_release_prp_pools(dev); 20581673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 205957dacad5SJay Sternberg } 206057dacad5SJay Sternberg 206157dacad5SJay Sternberg #ifdef CONFIG_PM_SLEEP 206257dacad5SJay Sternberg static int nvme_suspend(struct device *dev) 206357dacad5SJay Sternberg { 206457dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 206557dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 206657dacad5SJay Sternberg 2067a5cdb68cSKeith Busch nvme_dev_disable(ndev, true); 206857dacad5SJay Sternberg return 0; 206957dacad5SJay Sternberg } 207057dacad5SJay Sternberg 207157dacad5SJay Sternberg static int nvme_resume(struct device *dev) 207257dacad5SJay Sternberg { 207357dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 207457dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 207557dacad5SJay Sternberg 207692f7a162SKeith Busch queue_work(nvme_workq, &ndev->reset_work); 207757dacad5SJay Sternberg return 0; 207857dacad5SJay Sternberg } 207957dacad5SJay Sternberg #endif 208057dacad5SJay Sternberg 208157dacad5SJay Sternberg static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); 208257dacad5SJay Sternberg 2083a0a3408eSKeith Busch static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev, 2084a0a3408eSKeith Busch pci_channel_state_t state) 2085a0a3408eSKeith Busch { 2086a0a3408eSKeith Busch struct nvme_dev *dev = pci_get_drvdata(pdev); 2087a0a3408eSKeith Busch 2088a0a3408eSKeith Busch /* 2089a0a3408eSKeith Busch * A frozen channel requires a reset. When detected, this method will 2090a0a3408eSKeith Busch * shutdown the controller to quiesce. The controller will be restarted 2091a0a3408eSKeith Busch * after the slot reset through driver's slot_reset callback. 2092a0a3408eSKeith Busch */ 20931b3c47c1SSagi Grimberg dev_warn(dev->ctrl.device, "error detected: state:%d\n", state); 2094a0a3408eSKeith Busch switch (state) { 2095a0a3408eSKeith Busch case pci_channel_io_normal: 2096a0a3408eSKeith Busch return PCI_ERS_RESULT_CAN_RECOVER; 2097a0a3408eSKeith Busch case pci_channel_io_frozen: 2098a5cdb68cSKeith Busch nvme_dev_disable(dev, false); 2099a0a3408eSKeith Busch return PCI_ERS_RESULT_NEED_RESET; 2100a0a3408eSKeith Busch case pci_channel_io_perm_failure: 2101a0a3408eSKeith Busch return PCI_ERS_RESULT_DISCONNECT; 2102a0a3408eSKeith Busch } 2103a0a3408eSKeith Busch return PCI_ERS_RESULT_NEED_RESET; 2104a0a3408eSKeith Busch } 2105a0a3408eSKeith Busch 2106a0a3408eSKeith Busch static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev) 2107a0a3408eSKeith Busch { 2108a0a3408eSKeith Busch struct nvme_dev *dev = pci_get_drvdata(pdev); 2109a0a3408eSKeith Busch 21101b3c47c1SSagi Grimberg dev_info(dev->ctrl.device, "restart after slot reset\n"); 2111a0a3408eSKeith Busch pci_restore_state(pdev); 2112a0a3408eSKeith Busch queue_work(nvme_workq, &dev->reset_work); 2113a0a3408eSKeith Busch return PCI_ERS_RESULT_RECOVERED; 2114a0a3408eSKeith Busch } 2115a0a3408eSKeith Busch 2116a0a3408eSKeith Busch static void nvme_error_resume(struct pci_dev *pdev) 2117a0a3408eSKeith Busch { 2118a0a3408eSKeith Busch pci_cleanup_aer_uncorrect_error_status(pdev); 2119a0a3408eSKeith Busch } 2120a0a3408eSKeith Busch 212157dacad5SJay Sternberg static const struct pci_error_handlers nvme_err_handler = { 212257dacad5SJay Sternberg .error_detected = nvme_error_detected, 212357dacad5SJay Sternberg .slot_reset = nvme_slot_reset, 212457dacad5SJay Sternberg .resume = nvme_error_resume, 212557dacad5SJay Sternberg .reset_notify = nvme_reset_notify, 212657dacad5SJay Sternberg }; 212757dacad5SJay Sternberg 212857dacad5SJay Sternberg /* Move to pci_ids.h later */ 212957dacad5SJay Sternberg #define PCI_CLASS_STORAGE_EXPRESS 0x010802 213057dacad5SJay Sternberg 213157dacad5SJay Sternberg static const struct pci_device_id nvme_id_table[] = { 2132106198edSChristoph Hellwig { PCI_VDEVICE(INTEL, 0x0953), 2133*08095e70SKeith Busch .driver_data = NVME_QUIRK_STRIPE_SIZE | 2134*08095e70SKeith Busch NVME_QUIRK_DISCARD_ZEROES, }, 2135540c801cSKeith Busch { PCI_VDEVICE(INTEL, 0x5845), /* Qemu emulated controller */ 2136540c801cSKeith Busch .driver_data = NVME_QUIRK_IDENTIFY_CNS, }, 213757dacad5SJay Sternberg { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, 2138c74dc780SStephan Günther { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, 213957dacad5SJay Sternberg { 0, } 214057dacad5SJay Sternberg }; 214157dacad5SJay Sternberg MODULE_DEVICE_TABLE(pci, nvme_id_table); 214257dacad5SJay Sternberg 214357dacad5SJay Sternberg static struct pci_driver nvme_driver = { 214457dacad5SJay Sternberg .name = "nvme", 214557dacad5SJay Sternberg .id_table = nvme_id_table, 214657dacad5SJay Sternberg .probe = nvme_probe, 214757dacad5SJay Sternberg .remove = nvme_remove, 214857dacad5SJay Sternberg .shutdown = nvme_shutdown, 214957dacad5SJay Sternberg .driver = { 215057dacad5SJay Sternberg .pm = &nvme_dev_pm_ops, 215157dacad5SJay Sternberg }, 215257dacad5SJay Sternberg .err_handler = &nvme_err_handler, 215357dacad5SJay Sternberg }; 215457dacad5SJay Sternberg 215557dacad5SJay Sternberg static int __init nvme_init(void) 215657dacad5SJay Sternberg { 215757dacad5SJay Sternberg int result; 215857dacad5SJay Sternberg 215992f7a162SKeith Busch nvme_workq = alloc_workqueue("nvme", WQ_UNBOUND | WQ_MEM_RECLAIM, 0); 216057dacad5SJay Sternberg if (!nvme_workq) 216157dacad5SJay Sternberg return -ENOMEM; 216257dacad5SJay Sternberg 216357dacad5SJay Sternberg result = pci_register_driver(&nvme_driver); 216457dacad5SJay Sternberg if (result) 216557dacad5SJay Sternberg destroy_workqueue(nvme_workq); 216657dacad5SJay Sternberg return result; 216757dacad5SJay Sternberg } 216857dacad5SJay Sternberg 216957dacad5SJay Sternberg static void __exit nvme_exit(void) 217057dacad5SJay Sternberg { 217157dacad5SJay Sternberg pci_unregister_driver(&nvme_driver); 217257dacad5SJay Sternberg destroy_workqueue(nvme_workq); 217357dacad5SJay Sternberg _nvme_check_size(); 217457dacad5SJay Sternberg } 217557dacad5SJay Sternberg 217657dacad5SJay Sternberg MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); 217757dacad5SJay Sternberg MODULE_LICENSE("GPL"); 217857dacad5SJay Sternberg MODULE_VERSION("1.0"); 217957dacad5SJay Sternberg module_init(nvme_init); 218057dacad5SJay Sternberg module_exit(nvme_exit); 2181