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 1557dacad5SJay Sternberg #include <linux/bitops.h> 1657dacad5SJay Sternberg #include <linux/blkdev.h> 1757dacad5SJay Sternberg #include <linux/blk-mq.h> 1857dacad5SJay Sternberg #include <linux/cpu.h> 1957dacad5SJay Sternberg #include <linux/delay.h> 2057dacad5SJay Sternberg #include <linux/errno.h> 2157dacad5SJay Sternberg #include <linux/fs.h> 2257dacad5SJay Sternberg #include <linux/genhd.h> 2357dacad5SJay Sternberg #include <linux/hdreg.h> 2457dacad5SJay Sternberg #include <linux/idr.h> 2557dacad5SJay Sternberg #include <linux/init.h> 2657dacad5SJay Sternberg #include <linux/interrupt.h> 2757dacad5SJay Sternberg #include <linux/io.h> 2857dacad5SJay Sternberg #include <linux/kdev_t.h> 2957dacad5SJay Sternberg #include <linux/kthread.h> 3057dacad5SJay Sternberg #include <linux/kernel.h> 3157dacad5SJay Sternberg #include <linux/list_sort.h> 3257dacad5SJay Sternberg #include <linux/mm.h> 3357dacad5SJay Sternberg #include <linux/module.h> 3457dacad5SJay Sternberg #include <linux/moduleparam.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> 4157dacad5SJay Sternberg #include <linux/types.h> 421d277a63SKeith Busch #include <linux/pr.h> 4357dacad5SJay Sternberg #include <scsi/sg.h> 449cf5c095SLinus Torvalds #include <linux/io-64-nonatomic-lo-hi.h> 451d277a63SKeith Busch #include <asm/unaligned.h> 4657dacad5SJay Sternberg 4757dacad5SJay Sternberg #include <uapi/linux/nvme_ioctl.h> 4857dacad5SJay Sternberg #include "nvme.h" 4957dacad5SJay Sternberg 5057dacad5SJay Sternberg #define NVME_MINORS (1U << MINORBITS) 5157dacad5SJay Sternberg #define NVME_Q_DEPTH 1024 5257dacad5SJay Sternberg #define NVME_AQ_DEPTH 256 5357dacad5SJay Sternberg #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) 5457dacad5SJay Sternberg #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) 5557dacad5SJay Sternberg #define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ) 5657dacad5SJay Sternberg 5721d34711SChristoph Hellwig unsigned char admin_timeout = 60; 5857dacad5SJay Sternberg module_param(admin_timeout, byte, 0644); 5957dacad5SJay Sternberg MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); 6057dacad5SJay Sternberg 6157dacad5SJay Sternberg unsigned char nvme_io_timeout = 30; 6257dacad5SJay Sternberg module_param_named(io_timeout, nvme_io_timeout, byte, 0644); 6357dacad5SJay Sternberg MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); 6457dacad5SJay Sternberg 6557dacad5SJay Sternberg static unsigned char shutdown_timeout = 5; 6657dacad5SJay Sternberg module_param(shutdown_timeout, byte, 0644); 6757dacad5SJay Sternberg MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); 6857dacad5SJay Sternberg 6957dacad5SJay Sternberg static int nvme_major; 7057dacad5SJay Sternberg module_param(nvme_major, int, 0); 7157dacad5SJay Sternberg 7257dacad5SJay Sternberg static int nvme_char_major; 7357dacad5SJay Sternberg module_param(nvme_char_major, int, 0); 7457dacad5SJay Sternberg 7557dacad5SJay Sternberg static int use_threaded_interrupts; 7657dacad5SJay Sternberg module_param(use_threaded_interrupts, int, 0); 7757dacad5SJay Sternberg 7857dacad5SJay Sternberg static bool use_cmb_sqes = true; 7957dacad5SJay Sternberg module_param(use_cmb_sqes, bool, 0644); 8057dacad5SJay Sternberg MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); 8157dacad5SJay Sternberg 8257dacad5SJay Sternberg static LIST_HEAD(dev_list); 8357dacad5SJay Sternberg static struct task_struct *nvme_thread; 8457dacad5SJay Sternberg static struct workqueue_struct *nvme_workq; 8557dacad5SJay Sternberg static wait_queue_head_t nvme_kthread_wait; 8657dacad5SJay Sternberg 8757dacad5SJay Sternberg static struct class *nvme_class; 8857dacad5SJay Sternberg 891c63dc66SChristoph Hellwig struct nvme_dev; 901c63dc66SChristoph Hellwig struct nvme_queue; 91d4f6c3abSChristoph Hellwig struct nvme_iod; 921c63dc66SChristoph Hellwig 9357dacad5SJay Sternberg static int __nvme_reset(struct nvme_dev *dev); 9457dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev); 95a0fa9647SJens Axboe static void nvme_process_cq(struct nvme_queue *nvmeq); 96d4f6c3abSChristoph Hellwig static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod); 9757dacad5SJay Sternberg static void nvme_dead_ctrl(struct nvme_dev *dev); 9857dacad5SJay Sternberg 9957dacad5SJay Sternberg struct async_cmd_info { 10057dacad5SJay Sternberg struct kthread_work work; 10157dacad5SJay Sternberg struct kthread_worker *worker; 10257dacad5SJay Sternberg struct request *req; 10357dacad5SJay Sternberg u32 result; 10457dacad5SJay Sternberg int status; 10557dacad5SJay Sternberg void *ctx; 10657dacad5SJay Sternberg }; 10757dacad5SJay Sternberg 10857dacad5SJay Sternberg /* 1091c63dc66SChristoph Hellwig * Represents an NVM Express device. Each nvme_dev is a PCI function. 1101c63dc66SChristoph Hellwig */ 1111c63dc66SChristoph Hellwig struct nvme_dev { 1121c63dc66SChristoph Hellwig struct list_head node; 1131c63dc66SChristoph Hellwig struct nvme_queue **queues; 1141c63dc66SChristoph Hellwig struct blk_mq_tag_set tagset; 1151c63dc66SChristoph Hellwig struct blk_mq_tag_set admin_tagset; 1161c63dc66SChristoph Hellwig u32 __iomem *dbs; 1171c63dc66SChristoph Hellwig struct device *dev; 1181c63dc66SChristoph Hellwig struct dma_pool *prp_page_pool; 1191c63dc66SChristoph Hellwig struct dma_pool *prp_small_pool; 1201c63dc66SChristoph Hellwig unsigned queue_count; 1211c63dc66SChristoph Hellwig unsigned online_queues; 1221c63dc66SChristoph Hellwig unsigned max_qid; 1231c63dc66SChristoph Hellwig int q_depth; 1241c63dc66SChristoph Hellwig u32 db_stride; 1251c63dc66SChristoph Hellwig u32 ctrl_config; 1261c63dc66SChristoph Hellwig struct msix_entry *entry; 1271c63dc66SChristoph Hellwig void __iomem *bar; 1281c63dc66SChristoph Hellwig struct list_head namespaces; 1291c63dc66SChristoph Hellwig struct device *device; 1301c63dc66SChristoph Hellwig struct work_struct reset_work; 1311c63dc66SChristoph Hellwig struct work_struct probe_work; 1321c63dc66SChristoph Hellwig struct work_struct scan_work; 1331c63dc66SChristoph Hellwig bool subsystem; 1341c63dc66SChristoph Hellwig u32 max_hw_sectors; 1351c63dc66SChristoph Hellwig u32 stripe_size; 1361c63dc66SChristoph Hellwig u32 page_size; 1371c63dc66SChristoph Hellwig void __iomem *cmb; 1381c63dc66SChristoph Hellwig dma_addr_t cmb_dma_addr; 1391c63dc66SChristoph Hellwig u64 cmb_size; 1401c63dc66SChristoph Hellwig u32 cmbsz; 1411c63dc66SChristoph Hellwig 1421c63dc66SChristoph Hellwig struct nvme_ctrl ctrl; 1431c63dc66SChristoph Hellwig }; 1441c63dc66SChristoph Hellwig 1451c63dc66SChristoph Hellwig static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl) 1461c63dc66SChristoph Hellwig { 1471c63dc66SChristoph Hellwig return container_of(ctrl, struct nvme_dev, ctrl); 1481c63dc66SChristoph Hellwig } 1491c63dc66SChristoph Hellwig 1501c63dc66SChristoph Hellwig /* 15157dacad5SJay Sternberg * An NVM Express queue. Each device has at least two (one for admin 15257dacad5SJay Sternberg * commands and one for I/O commands). 15357dacad5SJay Sternberg */ 15457dacad5SJay Sternberg struct nvme_queue { 15557dacad5SJay Sternberg struct device *q_dmadev; 15657dacad5SJay Sternberg struct nvme_dev *dev; 15757dacad5SJay Sternberg char irqname[24]; /* nvme4294967295-65535\0 */ 15857dacad5SJay Sternberg spinlock_t q_lock; 15957dacad5SJay Sternberg struct nvme_command *sq_cmds; 16057dacad5SJay Sternberg struct nvme_command __iomem *sq_cmds_io; 16157dacad5SJay Sternberg volatile struct nvme_completion *cqes; 16257dacad5SJay Sternberg struct blk_mq_tags **tags; 16357dacad5SJay Sternberg dma_addr_t sq_dma_addr; 16457dacad5SJay Sternberg dma_addr_t cq_dma_addr; 16557dacad5SJay Sternberg u32 __iomem *q_db; 16657dacad5SJay Sternberg u16 q_depth; 16757dacad5SJay Sternberg s16 cq_vector; 16857dacad5SJay Sternberg u16 sq_head; 16957dacad5SJay Sternberg u16 sq_tail; 17057dacad5SJay Sternberg u16 cq_head; 17157dacad5SJay Sternberg u16 qid; 17257dacad5SJay Sternberg u8 cq_phase; 17357dacad5SJay Sternberg u8 cqe_seen; 17457dacad5SJay Sternberg struct async_cmd_info cmdinfo; 17557dacad5SJay Sternberg }; 17657dacad5SJay Sternberg 17757dacad5SJay Sternberg /* 17871bd150cSChristoph Hellwig * The nvme_iod describes the data in an I/O, including the list of PRP 17971bd150cSChristoph Hellwig * entries. You can't see it in this data structure because C doesn't let 18071bd150cSChristoph Hellwig * me express that. Use nvme_alloc_iod to ensure there's enough space 18171bd150cSChristoph Hellwig * allocated to store the PRP list. 18271bd150cSChristoph Hellwig */ 18371bd150cSChristoph Hellwig struct nvme_iod { 18471bd150cSChristoph Hellwig unsigned long private; /* For the use of the submitter of the I/O */ 18571bd150cSChristoph Hellwig int npages; /* In the PRP list. 0 means small pool in use */ 18671bd150cSChristoph Hellwig int offset; /* Of PRP list */ 18771bd150cSChristoph Hellwig int nents; /* Used in scatterlist */ 18871bd150cSChristoph Hellwig int length; /* Of data, in bytes */ 18971bd150cSChristoph Hellwig dma_addr_t first_dma; 19071bd150cSChristoph Hellwig struct scatterlist meta_sg[1]; /* metadata requires single contiguous buffer */ 19171bd150cSChristoph Hellwig struct scatterlist sg[0]; 19271bd150cSChristoph Hellwig }; 19371bd150cSChristoph Hellwig 19471bd150cSChristoph Hellwig /* 19557dacad5SJay Sternberg * Check we didin't inadvertently grow the command struct 19657dacad5SJay Sternberg */ 19757dacad5SJay Sternberg static inline void _nvme_check_size(void) 19857dacad5SJay Sternberg { 19957dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); 20057dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); 20157dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); 20257dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); 20357dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_features) != 64); 20457dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); 20557dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); 20657dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_command) != 64); 20757dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); 20857dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); 20957dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); 21057dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); 21157dacad5SJay Sternberg } 21257dacad5SJay Sternberg 21357dacad5SJay Sternberg typedef void (*nvme_completion_fn)(struct nvme_queue *, void *, 21457dacad5SJay Sternberg struct nvme_completion *); 21557dacad5SJay Sternberg 21657dacad5SJay Sternberg struct nvme_cmd_info { 21757dacad5SJay Sternberg nvme_completion_fn fn; 21857dacad5SJay Sternberg void *ctx; 21957dacad5SJay Sternberg int aborted; 22057dacad5SJay Sternberg struct nvme_queue *nvmeq; 22157dacad5SJay Sternberg struct nvme_iod iod[0]; 22257dacad5SJay Sternberg }; 22357dacad5SJay Sternberg 22457dacad5SJay Sternberg /* 22557dacad5SJay Sternberg * Max size of iod being embedded in the request payload 22657dacad5SJay Sternberg */ 22757dacad5SJay Sternberg #define NVME_INT_PAGES 2 22857dacad5SJay Sternberg #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->page_size) 22957dacad5SJay Sternberg #define NVME_INT_MASK 0x01 23057dacad5SJay Sternberg 23157dacad5SJay Sternberg /* 23257dacad5SJay Sternberg * Will slightly overestimate the number of pages needed. This is OK 23357dacad5SJay Sternberg * as it only leads to a small amount of wasted memory for the lifetime of 23457dacad5SJay Sternberg * the I/O. 23557dacad5SJay Sternberg */ 23657dacad5SJay Sternberg static int nvme_npages(unsigned size, struct nvme_dev *dev) 23757dacad5SJay Sternberg { 23857dacad5SJay Sternberg unsigned nprps = DIV_ROUND_UP(size + dev->page_size, dev->page_size); 23957dacad5SJay Sternberg return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); 24057dacad5SJay Sternberg } 24157dacad5SJay Sternberg 24257dacad5SJay Sternberg static unsigned int nvme_cmd_size(struct nvme_dev *dev) 24357dacad5SJay Sternberg { 24457dacad5SJay Sternberg unsigned int ret = sizeof(struct nvme_cmd_info); 24557dacad5SJay Sternberg 24657dacad5SJay Sternberg ret += sizeof(struct nvme_iod); 24757dacad5SJay Sternberg ret += sizeof(__le64 *) * nvme_npages(NVME_INT_BYTES(dev), dev); 24857dacad5SJay Sternberg ret += sizeof(struct scatterlist) * NVME_INT_PAGES; 24957dacad5SJay Sternberg 25057dacad5SJay Sternberg return ret; 25157dacad5SJay Sternberg } 25257dacad5SJay Sternberg 25357dacad5SJay Sternberg static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 25457dacad5SJay Sternberg unsigned int hctx_idx) 25557dacad5SJay Sternberg { 25657dacad5SJay Sternberg struct nvme_dev *dev = data; 25757dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 25857dacad5SJay Sternberg 25957dacad5SJay Sternberg WARN_ON(hctx_idx != 0); 26057dacad5SJay Sternberg WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); 26157dacad5SJay Sternberg WARN_ON(nvmeq->tags); 26257dacad5SJay Sternberg 26357dacad5SJay Sternberg hctx->driver_data = nvmeq; 26457dacad5SJay Sternberg nvmeq->tags = &dev->admin_tagset.tags[0]; 26557dacad5SJay Sternberg return 0; 26657dacad5SJay Sternberg } 26757dacad5SJay Sternberg 26857dacad5SJay Sternberg static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) 26957dacad5SJay Sternberg { 27057dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 27157dacad5SJay Sternberg 27257dacad5SJay Sternberg nvmeq->tags = NULL; 27357dacad5SJay Sternberg } 27457dacad5SJay Sternberg 27557dacad5SJay Sternberg static int nvme_admin_init_request(void *data, struct request *req, 27657dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 27757dacad5SJay Sternberg unsigned int numa_node) 27857dacad5SJay Sternberg { 27957dacad5SJay Sternberg struct nvme_dev *dev = data; 28057dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 28157dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 28257dacad5SJay Sternberg 28357dacad5SJay Sternberg BUG_ON(!nvmeq); 28457dacad5SJay Sternberg cmd->nvmeq = nvmeq; 28557dacad5SJay Sternberg return 0; 28657dacad5SJay Sternberg } 28757dacad5SJay Sternberg 28857dacad5SJay Sternberg static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 28957dacad5SJay Sternberg unsigned int hctx_idx) 29057dacad5SJay Sternberg { 29157dacad5SJay Sternberg struct nvme_dev *dev = data; 29257dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 29357dacad5SJay Sternberg 29457dacad5SJay Sternberg if (!nvmeq->tags) 29557dacad5SJay Sternberg nvmeq->tags = &dev->tagset.tags[hctx_idx]; 29657dacad5SJay Sternberg 29757dacad5SJay Sternberg WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); 29857dacad5SJay Sternberg hctx->driver_data = nvmeq; 29957dacad5SJay Sternberg return 0; 30057dacad5SJay Sternberg } 30157dacad5SJay Sternberg 30257dacad5SJay Sternberg static int nvme_init_request(void *data, struct request *req, 30357dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 30457dacad5SJay Sternberg unsigned int numa_node) 30557dacad5SJay Sternberg { 30657dacad5SJay Sternberg struct nvme_dev *dev = data; 30757dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 30857dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 30957dacad5SJay Sternberg 31057dacad5SJay Sternberg BUG_ON(!nvmeq); 31157dacad5SJay Sternberg cmd->nvmeq = nvmeq; 31257dacad5SJay Sternberg return 0; 31357dacad5SJay Sternberg } 31457dacad5SJay Sternberg 31557dacad5SJay Sternberg static void nvme_set_info(struct nvme_cmd_info *cmd, void *ctx, 31657dacad5SJay Sternberg nvme_completion_fn handler) 31757dacad5SJay Sternberg { 31857dacad5SJay Sternberg cmd->fn = handler; 31957dacad5SJay Sternberg cmd->ctx = ctx; 32057dacad5SJay Sternberg cmd->aborted = 0; 32157dacad5SJay Sternberg blk_mq_start_request(blk_mq_rq_from_pdu(cmd)); 32257dacad5SJay Sternberg } 32357dacad5SJay Sternberg 32457dacad5SJay Sternberg static void *iod_get_private(struct nvme_iod *iod) 32557dacad5SJay Sternberg { 32657dacad5SJay Sternberg return (void *) (iod->private & ~0x1UL); 32757dacad5SJay Sternberg } 32857dacad5SJay Sternberg 32957dacad5SJay Sternberg /* 33057dacad5SJay Sternberg * If bit 0 is set, the iod is embedded in the request payload. 33157dacad5SJay Sternberg */ 33257dacad5SJay Sternberg static bool iod_should_kfree(struct nvme_iod *iod) 33357dacad5SJay Sternberg { 33457dacad5SJay Sternberg return (iod->private & NVME_INT_MASK) == 0; 33557dacad5SJay Sternberg } 33657dacad5SJay Sternberg 33757dacad5SJay Sternberg /* Special values must be less than 0x1000 */ 33857dacad5SJay Sternberg #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA) 33957dacad5SJay Sternberg #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE) 34057dacad5SJay Sternberg #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE) 34157dacad5SJay Sternberg #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE) 34257dacad5SJay Sternberg 34357dacad5SJay Sternberg static void special_completion(struct nvme_queue *nvmeq, void *ctx, 34457dacad5SJay Sternberg struct nvme_completion *cqe) 34557dacad5SJay Sternberg { 34657dacad5SJay Sternberg if (ctx == CMD_CTX_CANCELLED) 34757dacad5SJay Sternberg return; 34857dacad5SJay Sternberg if (ctx == CMD_CTX_COMPLETED) { 34957dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, 35057dacad5SJay Sternberg "completed id %d twice on queue %d\n", 35157dacad5SJay Sternberg cqe->command_id, le16_to_cpup(&cqe->sq_id)); 35257dacad5SJay Sternberg return; 35357dacad5SJay Sternberg } 35457dacad5SJay Sternberg if (ctx == CMD_CTX_INVALID) { 35557dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, 35657dacad5SJay Sternberg "invalid id %d completed on queue %d\n", 35757dacad5SJay Sternberg cqe->command_id, le16_to_cpup(&cqe->sq_id)); 35857dacad5SJay Sternberg return; 35957dacad5SJay Sternberg } 36057dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Unknown special completion %p\n", ctx); 36157dacad5SJay Sternberg } 36257dacad5SJay Sternberg 36357dacad5SJay Sternberg static void *cancel_cmd_info(struct nvme_cmd_info *cmd, nvme_completion_fn *fn) 36457dacad5SJay Sternberg { 36557dacad5SJay Sternberg void *ctx; 36657dacad5SJay Sternberg 36757dacad5SJay Sternberg if (fn) 36857dacad5SJay Sternberg *fn = cmd->fn; 36957dacad5SJay Sternberg ctx = cmd->ctx; 37057dacad5SJay Sternberg cmd->fn = special_completion; 37157dacad5SJay Sternberg cmd->ctx = CMD_CTX_CANCELLED; 37257dacad5SJay Sternberg return ctx; 37357dacad5SJay Sternberg } 37457dacad5SJay Sternberg 37557dacad5SJay Sternberg static void async_req_completion(struct nvme_queue *nvmeq, void *ctx, 37657dacad5SJay Sternberg struct nvme_completion *cqe) 37757dacad5SJay Sternberg { 37857dacad5SJay Sternberg u32 result = le32_to_cpup(&cqe->result); 37957dacad5SJay Sternberg u16 status = le16_to_cpup(&cqe->status) >> 1; 38057dacad5SJay Sternberg 38157dacad5SJay Sternberg if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) 3821c63dc66SChristoph Hellwig ++nvmeq->dev->ctrl.event_limit; 38357dacad5SJay Sternberg if (status != NVME_SC_SUCCESS) 38457dacad5SJay Sternberg return; 38557dacad5SJay Sternberg 38657dacad5SJay Sternberg switch (result & 0xff07) { 38757dacad5SJay Sternberg case NVME_AER_NOTICE_NS_CHANGED: 38857dacad5SJay Sternberg dev_info(nvmeq->q_dmadev, "rescanning\n"); 38957dacad5SJay Sternberg schedule_work(&nvmeq->dev->scan_work); 39057dacad5SJay Sternberg default: 39157dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "async event result %08x\n", result); 39257dacad5SJay Sternberg } 39357dacad5SJay Sternberg } 39457dacad5SJay Sternberg 39557dacad5SJay Sternberg static void abort_completion(struct nvme_queue *nvmeq, void *ctx, 39657dacad5SJay Sternberg struct nvme_completion *cqe) 39757dacad5SJay Sternberg { 39857dacad5SJay Sternberg struct request *req = ctx; 39957dacad5SJay Sternberg 40057dacad5SJay Sternberg u16 status = le16_to_cpup(&cqe->status) >> 1; 40157dacad5SJay Sternberg u32 result = le32_to_cpup(&cqe->result); 40257dacad5SJay Sternberg 40357dacad5SJay Sternberg blk_mq_free_request(req); 40457dacad5SJay Sternberg 40557dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status, result); 4061c63dc66SChristoph Hellwig ++nvmeq->dev->ctrl.abort_limit; 40757dacad5SJay Sternberg } 40857dacad5SJay Sternberg 40957dacad5SJay Sternberg static void async_completion(struct nvme_queue *nvmeq, void *ctx, 41057dacad5SJay Sternberg struct nvme_completion *cqe) 41157dacad5SJay Sternberg { 41257dacad5SJay Sternberg struct async_cmd_info *cmdinfo = ctx; 41357dacad5SJay Sternberg cmdinfo->result = le32_to_cpup(&cqe->result); 41457dacad5SJay Sternberg cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; 41557dacad5SJay Sternberg queue_kthread_work(cmdinfo->worker, &cmdinfo->work); 41657dacad5SJay Sternberg blk_mq_free_request(cmdinfo->req); 41757dacad5SJay Sternberg } 41857dacad5SJay Sternberg 41957dacad5SJay Sternberg static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq, 42057dacad5SJay Sternberg unsigned int tag) 42157dacad5SJay Sternberg { 42257dacad5SJay Sternberg struct request *req = blk_mq_tag_to_rq(*nvmeq->tags, tag); 42357dacad5SJay Sternberg 42457dacad5SJay Sternberg return blk_mq_rq_to_pdu(req); 42557dacad5SJay Sternberg } 42657dacad5SJay Sternberg 42757dacad5SJay Sternberg /* 42857dacad5SJay Sternberg * Called with local interrupts disabled and the q_lock held. May not sleep. 42957dacad5SJay Sternberg */ 43057dacad5SJay Sternberg static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag, 43157dacad5SJay Sternberg nvme_completion_fn *fn) 43257dacad5SJay Sternberg { 43357dacad5SJay Sternberg struct nvme_cmd_info *cmd = get_cmd_from_tag(nvmeq, tag); 43457dacad5SJay Sternberg void *ctx; 43557dacad5SJay Sternberg if (tag >= nvmeq->q_depth) { 43657dacad5SJay Sternberg *fn = special_completion; 43757dacad5SJay Sternberg return CMD_CTX_INVALID; 43857dacad5SJay Sternberg } 43957dacad5SJay Sternberg if (fn) 44057dacad5SJay Sternberg *fn = cmd->fn; 44157dacad5SJay Sternberg ctx = cmd->ctx; 44257dacad5SJay Sternberg cmd->fn = special_completion; 44357dacad5SJay Sternberg cmd->ctx = CMD_CTX_COMPLETED; 44457dacad5SJay Sternberg return ctx; 44557dacad5SJay Sternberg } 44657dacad5SJay Sternberg 44757dacad5SJay Sternberg /** 44857dacad5SJay Sternberg * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell 44957dacad5SJay Sternberg * @nvmeq: The queue to use 45057dacad5SJay Sternberg * @cmd: The command to send 45157dacad5SJay Sternberg * 45257dacad5SJay Sternberg * Safe to use from interrupt context 45357dacad5SJay Sternberg */ 45457dacad5SJay Sternberg static void __nvme_submit_cmd(struct nvme_queue *nvmeq, 45557dacad5SJay Sternberg struct nvme_command *cmd) 45657dacad5SJay Sternberg { 45757dacad5SJay Sternberg u16 tail = nvmeq->sq_tail; 45857dacad5SJay Sternberg 45957dacad5SJay Sternberg if (nvmeq->sq_cmds_io) 46057dacad5SJay Sternberg memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); 46157dacad5SJay Sternberg else 46257dacad5SJay Sternberg memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); 46357dacad5SJay Sternberg 46457dacad5SJay Sternberg if (++tail == nvmeq->q_depth) 46557dacad5SJay Sternberg tail = 0; 46657dacad5SJay Sternberg writel(tail, nvmeq->q_db); 46757dacad5SJay Sternberg nvmeq->sq_tail = tail; 46857dacad5SJay Sternberg } 46957dacad5SJay Sternberg 47057dacad5SJay Sternberg static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) 47157dacad5SJay Sternberg { 47257dacad5SJay Sternberg unsigned long flags; 47357dacad5SJay Sternberg spin_lock_irqsave(&nvmeq->q_lock, flags); 47457dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, cmd); 47557dacad5SJay Sternberg spin_unlock_irqrestore(&nvmeq->q_lock, flags); 47657dacad5SJay Sternberg } 47757dacad5SJay Sternberg 47857dacad5SJay Sternberg static __le64 **iod_list(struct nvme_iod *iod) 47957dacad5SJay Sternberg { 48057dacad5SJay Sternberg return ((void *)iod) + iod->offset; 48157dacad5SJay Sternberg } 48257dacad5SJay Sternberg 48357dacad5SJay Sternberg static inline void iod_init(struct nvme_iod *iod, unsigned nbytes, 48457dacad5SJay Sternberg unsigned nseg, unsigned long private) 48557dacad5SJay Sternberg { 48657dacad5SJay Sternberg iod->private = private; 48757dacad5SJay Sternberg iod->offset = offsetof(struct nvme_iod, sg[nseg]); 48857dacad5SJay Sternberg iod->npages = -1; 48957dacad5SJay Sternberg iod->length = nbytes; 49057dacad5SJay Sternberg iod->nents = 0; 49157dacad5SJay Sternberg } 49257dacad5SJay Sternberg 49357dacad5SJay Sternberg static struct nvme_iod * 49457dacad5SJay Sternberg __nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev, 49557dacad5SJay Sternberg unsigned long priv, gfp_t gfp) 49657dacad5SJay Sternberg { 49757dacad5SJay Sternberg struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) + 49857dacad5SJay Sternberg sizeof(__le64 *) * nvme_npages(bytes, dev) + 49957dacad5SJay Sternberg sizeof(struct scatterlist) * nseg, gfp); 50057dacad5SJay Sternberg 50157dacad5SJay Sternberg if (iod) 50257dacad5SJay Sternberg iod_init(iod, bytes, nseg, priv); 50357dacad5SJay Sternberg 50457dacad5SJay Sternberg return iod; 50557dacad5SJay Sternberg } 50657dacad5SJay Sternberg 50757dacad5SJay Sternberg static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev, 50857dacad5SJay Sternberg gfp_t gfp) 50957dacad5SJay Sternberg { 51057dacad5SJay Sternberg unsigned size = !(rq->cmd_flags & REQ_DISCARD) ? blk_rq_bytes(rq) : 51157dacad5SJay Sternberg sizeof(struct nvme_dsm_range); 51257dacad5SJay Sternberg struct nvme_iod *iod; 51357dacad5SJay Sternberg 51457dacad5SJay Sternberg if (rq->nr_phys_segments <= NVME_INT_PAGES && 51557dacad5SJay Sternberg size <= NVME_INT_BYTES(dev)) { 51657dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(rq); 51757dacad5SJay Sternberg 51857dacad5SJay Sternberg iod = cmd->iod; 51957dacad5SJay Sternberg iod_init(iod, size, rq->nr_phys_segments, 52057dacad5SJay Sternberg (unsigned long) rq | NVME_INT_MASK); 52157dacad5SJay Sternberg return iod; 52257dacad5SJay Sternberg } 52357dacad5SJay Sternberg 52457dacad5SJay Sternberg return __nvme_alloc_iod(rq->nr_phys_segments, size, dev, 52557dacad5SJay Sternberg (unsigned long) rq, gfp); 52657dacad5SJay Sternberg } 52757dacad5SJay Sternberg 52857dacad5SJay Sternberg static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod) 52957dacad5SJay Sternberg { 53057dacad5SJay Sternberg const int last_prp = dev->page_size / 8 - 1; 53157dacad5SJay Sternberg int i; 53257dacad5SJay Sternberg __le64 **list = iod_list(iod); 53357dacad5SJay Sternberg dma_addr_t prp_dma = iod->first_dma; 53457dacad5SJay Sternberg 53557dacad5SJay Sternberg if (iod->npages == 0) 53657dacad5SJay Sternberg dma_pool_free(dev->prp_small_pool, list[0], prp_dma); 53757dacad5SJay Sternberg for (i = 0; i < iod->npages; i++) { 53857dacad5SJay Sternberg __le64 *prp_list = list[i]; 53957dacad5SJay Sternberg dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); 54057dacad5SJay Sternberg dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); 54157dacad5SJay Sternberg prp_dma = next_prp_dma; 54257dacad5SJay Sternberg } 54357dacad5SJay Sternberg 54457dacad5SJay Sternberg if (iod_should_kfree(iod)) 54557dacad5SJay Sternberg kfree(iod); 54657dacad5SJay Sternberg } 54757dacad5SJay Sternberg 54857dacad5SJay Sternberg #ifdef CONFIG_BLK_DEV_INTEGRITY 54957dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 55057dacad5SJay Sternberg { 55157dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == v) 55257dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(p); 55357dacad5SJay Sternberg } 55457dacad5SJay Sternberg 55557dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 55657dacad5SJay Sternberg { 55757dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == p) 55857dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(v); 55957dacad5SJay Sternberg } 56057dacad5SJay Sternberg 56157dacad5SJay Sternberg /** 56257dacad5SJay Sternberg * nvme_dif_remap - remaps ref tags to bip seed and physical lba 56357dacad5SJay Sternberg * 56457dacad5SJay Sternberg * The virtual start sector is the one that was originally submitted by the 56557dacad5SJay Sternberg * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical 56657dacad5SJay Sternberg * start sector may be different. Remap protection information to match the 56757dacad5SJay Sternberg * physical LBA on writes, and back to the original seed on reads. 56857dacad5SJay Sternberg * 56957dacad5SJay Sternberg * Type 0 and 3 do not have a ref tag, so no remapping required. 57057dacad5SJay Sternberg */ 57157dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 57257dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 57357dacad5SJay Sternberg { 57457dacad5SJay Sternberg struct nvme_ns *ns = req->rq_disk->private_data; 57557dacad5SJay Sternberg struct bio_integrity_payload *bip; 57657dacad5SJay Sternberg struct t10_pi_tuple *pi; 57757dacad5SJay Sternberg void *p, *pmap; 57857dacad5SJay Sternberg u32 i, nlb, ts, phys, virt; 57957dacad5SJay Sternberg 58057dacad5SJay Sternberg if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) 58157dacad5SJay Sternberg return; 58257dacad5SJay Sternberg 58357dacad5SJay Sternberg bip = bio_integrity(req->bio); 58457dacad5SJay Sternberg if (!bip) 58557dacad5SJay Sternberg return; 58657dacad5SJay Sternberg 58757dacad5SJay Sternberg pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; 58857dacad5SJay Sternberg 58957dacad5SJay Sternberg p = pmap; 59057dacad5SJay Sternberg virt = bip_get_seed(bip); 59157dacad5SJay Sternberg phys = nvme_block_nr(ns, blk_rq_pos(req)); 59257dacad5SJay Sternberg nlb = (blk_rq_bytes(req) >> ns->lba_shift); 593ac6fc48cSDan Williams ts = ns->disk->queue->integrity.tuple_size; 59457dacad5SJay Sternberg 59557dacad5SJay Sternberg for (i = 0; i < nlb; i++, virt++, phys++) { 59657dacad5SJay Sternberg pi = (struct t10_pi_tuple *)p; 59757dacad5SJay Sternberg dif_swap(phys, virt, pi); 59857dacad5SJay Sternberg p += ts; 59957dacad5SJay Sternberg } 60057dacad5SJay Sternberg kunmap_atomic(pmap); 60157dacad5SJay Sternberg } 60257dacad5SJay Sternberg #else /* CONFIG_BLK_DEV_INTEGRITY */ 60357dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 60457dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 60557dacad5SJay Sternberg { 60657dacad5SJay Sternberg } 60757dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 60857dacad5SJay Sternberg { 60957dacad5SJay Sternberg } 61057dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 61157dacad5SJay Sternberg { 61257dacad5SJay Sternberg } 61357dacad5SJay Sternberg #endif 61457dacad5SJay Sternberg 61557dacad5SJay Sternberg static void req_completion(struct nvme_queue *nvmeq, void *ctx, 61657dacad5SJay Sternberg struct nvme_completion *cqe) 61757dacad5SJay Sternberg { 61857dacad5SJay Sternberg struct nvme_iod *iod = ctx; 61957dacad5SJay Sternberg struct request *req = iod_get_private(iod); 62057dacad5SJay Sternberg struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); 62157dacad5SJay Sternberg u16 status = le16_to_cpup(&cqe->status) >> 1; 622ef658fc2SJens Axboe int error = 0; 62357dacad5SJay Sternberg 62457dacad5SJay Sternberg if (unlikely(status)) { 62557dacad5SJay Sternberg if (!(status & NVME_SC_DNR || blk_noretry_request(req)) 62657dacad5SJay Sternberg && (jiffies - req->start_time) < req->timeout) { 62757dacad5SJay Sternberg unsigned long flags; 62857dacad5SJay Sternberg 629d4f6c3abSChristoph Hellwig nvme_unmap_data(nvmeq->dev, iod); 630d4f6c3abSChristoph Hellwig 63157dacad5SJay Sternberg blk_mq_requeue_request(req); 63257dacad5SJay Sternberg spin_lock_irqsave(req->q->queue_lock, flags); 63357dacad5SJay Sternberg if (!blk_queue_stopped(req->q)) 63457dacad5SJay Sternberg blk_mq_kick_requeue_list(req->q); 63557dacad5SJay Sternberg spin_unlock_irqrestore(req->q->queue_lock, flags); 636d4f6c3abSChristoph Hellwig return; 63757dacad5SJay Sternberg } 63857dacad5SJay Sternberg 63957dacad5SJay Sternberg if (req->cmd_type == REQ_TYPE_DRV_PRIV) { 64057dacad5SJay Sternberg if (cmd_rq->ctx == CMD_CTX_CANCELLED) 6411951feaeSChristoph Hellwig error = -EINTR; 6421951feaeSChristoph Hellwig else 6431951feaeSChristoph Hellwig error = status; 64457dacad5SJay Sternberg } else { 6451951feaeSChristoph Hellwig error = nvme_error_status(status); 64657dacad5SJay Sternberg } 64757dacad5SJay Sternberg } 64857dacad5SJay Sternberg 64957dacad5SJay Sternberg if (req->cmd_type == REQ_TYPE_DRV_PRIV) { 65057dacad5SJay Sternberg u32 result = le32_to_cpup(&cqe->result); 65157dacad5SJay Sternberg req->special = (void *)(uintptr_t)result; 65257dacad5SJay Sternberg } 65357dacad5SJay Sternberg 65457dacad5SJay Sternberg if (cmd_rq->aborted) 65557dacad5SJay Sternberg dev_warn(nvmeq->dev->dev, 65657dacad5SJay Sternberg "completing aborted command with status:%04x\n", 6571951feaeSChristoph Hellwig error); 65857dacad5SJay Sternberg 659d4f6c3abSChristoph Hellwig nvme_unmap_data(nvmeq->dev, iod); 6601951feaeSChristoph Hellwig blk_mq_complete_request(req, error); 66157dacad5SJay Sternberg } 66257dacad5SJay Sternberg 66369d2b571SChristoph Hellwig static bool nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod, 66469d2b571SChristoph Hellwig int total_len) 66557dacad5SJay Sternberg { 66657dacad5SJay Sternberg struct dma_pool *pool; 66757dacad5SJay Sternberg int length = total_len; 66857dacad5SJay Sternberg struct scatterlist *sg = iod->sg; 66957dacad5SJay Sternberg int dma_len = sg_dma_len(sg); 67057dacad5SJay Sternberg u64 dma_addr = sg_dma_address(sg); 67157dacad5SJay Sternberg u32 page_size = dev->page_size; 67257dacad5SJay Sternberg int offset = dma_addr & (page_size - 1); 67357dacad5SJay Sternberg __le64 *prp_list; 67457dacad5SJay Sternberg __le64 **list = iod_list(iod); 67557dacad5SJay Sternberg dma_addr_t prp_dma; 67657dacad5SJay Sternberg int nprps, i; 67757dacad5SJay Sternberg 67857dacad5SJay Sternberg length -= (page_size - offset); 67957dacad5SJay Sternberg if (length <= 0) 68069d2b571SChristoph Hellwig return true; 68157dacad5SJay Sternberg 68257dacad5SJay Sternberg dma_len -= (page_size - offset); 68357dacad5SJay Sternberg if (dma_len) { 68457dacad5SJay Sternberg dma_addr += (page_size - offset); 68557dacad5SJay Sternberg } else { 68657dacad5SJay Sternberg sg = sg_next(sg); 68757dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 68857dacad5SJay Sternberg dma_len = sg_dma_len(sg); 68957dacad5SJay Sternberg } 69057dacad5SJay Sternberg 69157dacad5SJay Sternberg if (length <= page_size) { 69257dacad5SJay Sternberg iod->first_dma = dma_addr; 69369d2b571SChristoph Hellwig return true; 69457dacad5SJay Sternberg } 69557dacad5SJay Sternberg 69657dacad5SJay Sternberg nprps = DIV_ROUND_UP(length, page_size); 69757dacad5SJay Sternberg if (nprps <= (256 / 8)) { 69857dacad5SJay Sternberg pool = dev->prp_small_pool; 69957dacad5SJay Sternberg iod->npages = 0; 70057dacad5SJay Sternberg } else { 70157dacad5SJay Sternberg pool = dev->prp_page_pool; 70257dacad5SJay Sternberg iod->npages = 1; 70357dacad5SJay Sternberg } 70457dacad5SJay Sternberg 70569d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 70657dacad5SJay Sternberg if (!prp_list) { 70757dacad5SJay Sternberg iod->first_dma = dma_addr; 70857dacad5SJay Sternberg iod->npages = -1; 70969d2b571SChristoph Hellwig return false; 71057dacad5SJay Sternberg } 71157dacad5SJay Sternberg list[0] = prp_list; 71257dacad5SJay Sternberg iod->first_dma = prp_dma; 71357dacad5SJay Sternberg i = 0; 71457dacad5SJay Sternberg for (;;) { 71557dacad5SJay Sternberg if (i == page_size >> 3) { 71657dacad5SJay Sternberg __le64 *old_prp_list = prp_list; 71769d2b571SChristoph Hellwig prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma); 71857dacad5SJay Sternberg if (!prp_list) 71969d2b571SChristoph Hellwig return false; 72057dacad5SJay Sternberg list[iod->npages++] = prp_list; 72157dacad5SJay Sternberg prp_list[0] = old_prp_list[i - 1]; 72257dacad5SJay Sternberg old_prp_list[i - 1] = cpu_to_le64(prp_dma); 72357dacad5SJay Sternberg i = 1; 72457dacad5SJay Sternberg } 72557dacad5SJay Sternberg prp_list[i++] = cpu_to_le64(dma_addr); 72657dacad5SJay Sternberg dma_len -= page_size; 72757dacad5SJay Sternberg dma_addr += page_size; 72857dacad5SJay Sternberg length -= page_size; 72957dacad5SJay Sternberg if (length <= 0) 73057dacad5SJay Sternberg break; 73157dacad5SJay Sternberg if (dma_len > 0) 73257dacad5SJay Sternberg continue; 73357dacad5SJay Sternberg BUG_ON(dma_len < 0); 73457dacad5SJay Sternberg sg = sg_next(sg); 73557dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 73657dacad5SJay Sternberg dma_len = sg_dma_len(sg); 73757dacad5SJay Sternberg } 73857dacad5SJay Sternberg 73969d2b571SChristoph Hellwig return true; 74057dacad5SJay Sternberg } 74157dacad5SJay Sternberg 742ba1ca37eSChristoph Hellwig static int nvme_map_data(struct nvme_dev *dev, struct nvme_iod *iod, 743ba1ca37eSChristoph Hellwig struct nvme_command *cmnd) 74457dacad5SJay Sternberg { 745ba1ca37eSChristoph Hellwig struct request *req = iod_get_private(iod); 746ba1ca37eSChristoph Hellwig struct request_queue *q = req->q; 747ba1ca37eSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 748ba1ca37eSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 749ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_ERROR; 75057dacad5SJay Sternberg 751ba1ca37eSChristoph Hellwig sg_init_table(iod->sg, req->nr_phys_segments); 752ba1ca37eSChristoph Hellwig iod->nents = blk_rq_map_sg(q, req, iod->sg); 753ba1ca37eSChristoph Hellwig if (!iod->nents) 754ba1ca37eSChristoph Hellwig goto out; 755ba1ca37eSChristoph Hellwig 756ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_BUSY; 757ba1ca37eSChristoph Hellwig if (!dma_map_sg(dev->dev, iod->sg, iod->nents, dma_dir)) 758ba1ca37eSChristoph Hellwig goto out; 759ba1ca37eSChristoph Hellwig 760ba1ca37eSChristoph Hellwig if (!nvme_setup_prps(dev, iod, blk_rq_bytes(req))) 761ba1ca37eSChristoph Hellwig goto out_unmap; 762ba1ca37eSChristoph Hellwig 763ba1ca37eSChristoph Hellwig ret = BLK_MQ_RQ_QUEUE_ERROR; 764ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) { 765ba1ca37eSChristoph Hellwig if (blk_rq_count_integrity_sg(q, req->bio) != 1) 766ba1ca37eSChristoph Hellwig goto out_unmap; 767ba1ca37eSChristoph Hellwig 768ba1ca37eSChristoph Hellwig sg_init_table(iod->meta_sg, 1); 769ba1ca37eSChristoph Hellwig if (blk_rq_map_integrity_sg(q, req->bio, iod->meta_sg) != 1) 770ba1ca37eSChristoph Hellwig goto out_unmap; 771ba1ca37eSChristoph Hellwig 772ba1ca37eSChristoph Hellwig if (rq_data_dir(req)) 773ba1ca37eSChristoph Hellwig nvme_dif_remap(req, nvme_dif_prep); 774ba1ca37eSChristoph Hellwig 775ba1ca37eSChristoph Hellwig if (!dma_map_sg(dev->dev, iod->meta_sg, 1, dma_dir)) 776ba1ca37eSChristoph Hellwig goto out_unmap; 77757dacad5SJay Sternberg } 77857dacad5SJay Sternberg 779ba1ca37eSChristoph Hellwig cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); 780ba1ca37eSChristoph Hellwig cmnd->rw.prp2 = cpu_to_le64(iod->first_dma); 781ba1ca37eSChristoph Hellwig if (blk_integrity_rq(req)) 782ba1ca37eSChristoph Hellwig cmnd->rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg)); 783ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_OK; 784ba1ca37eSChristoph Hellwig 785ba1ca37eSChristoph Hellwig out_unmap: 786ba1ca37eSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 787ba1ca37eSChristoph Hellwig out: 788ba1ca37eSChristoph Hellwig return ret; 78957dacad5SJay Sternberg } 79057dacad5SJay Sternberg 791d4f6c3abSChristoph Hellwig static void nvme_unmap_data(struct nvme_dev *dev, struct nvme_iod *iod) 792d4f6c3abSChristoph Hellwig { 793d4f6c3abSChristoph Hellwig struct request *req = iod_get_private(iod); 794d4f6c3abSChristoph Hellwig enum dma_data_direction dma_dir = rq_data_dir(req) ? 795d4f6c3abSChristoph Hellwig DMA_TO_DEVICE : DMA_FROM_DEVICE; 796d4f6c3abSChristoph Hellwig 797d4f6c3abSChristoph Hellwig if (iod->nents) { 798d4f6c3abSChristoph Hellwig dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 799d4f6c3abSChristoph Hellwig if (blk_integrity_rq(req)) { 800d4f6c3abSChristoph Hellwig if (!rq_data_dir(req)) 801d4f6c3abSChristoph Hellwig nvme_dif_remap(req, nvme_dif_complete); 802d4f6c3abSChristoph Hellwig dma_unmap_sg(dev->dev, iod->meta_sg, 1, dma_dir); 803d4f6c3abSChristoph Hellwig } 804d4f6c3abSChristoph Hellwig } 805d4f6c3abSChristoph Hellwig 806d4f6c3abSChristoph Hellwig nvme_free_iod(dev, iod); 807d4f6c3abSChristoph Hellwig } 808d4f6c3abSChristoph Hellwig 80957dacad5SJay Sternberg /* 81057dacad5SJay Sternberg * We reuse the small pool to allocate the 16-byte range here as it is not 81157dacad5SJay Sternberg * worth having a special pool for these or additional cases to handle freeing 81257dacad5SJay Sternberg * the iod. 81357dacad5SJay Sternberg */ 814ba1ca37eSChristoph Hellwig static int nvme_setup_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, 815ba1ca37eSChristoph Hellwig struct nvme_iod *iod, struct nvme_command *cmnd) 81657dacad5SJay Sternberg { 817ba1ca37eSChristoph Hellwig struct request *req = iod_get_private(iod); 818ba1ca37eSChristoph Hellwig struct nvme_dsm_range *range; 819ba1ca37eSChristoph Hellwig 820ba1ca37eSChristoph Hellwig range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC, 821ba1ca37eSChristoph Hellwig &iod->first_dma); 822ba1ca37eSChristoph Hellwig if (!range) 823ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_BUSY; 824ba1ca37eSChristoph Hellwig iod_list(iod)[0] = (__le64 *)range; 825ba1ca37eSChristoph Hellwig iod->npages = 0; 82657dacad5SJay Sternberg 82757dacad5SJay Sternberg range->cattr = cpu_to_le32(0); 82857dacad5SJay Sternberg range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift); 82957dacad5SJay Sternberg range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); 83057dacad5SJay Sternberg 831ba1ca37eSChristoph Hellwig memset(cmnd, 0, sizeof(*cmnd)); 832ba1ca37eSChristoph Hellwig cmnd->dsm.opcode = nvme_cmd_dsm; 833ba1ca37eSChristoph Hellwig cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); 834ba1ca37eSChristoph Hellwig cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma); 835ba1ca37eSChristoph Hellwig cmnd->dsm.nr = 0; 836ba1ca37eSChristoph Hellwig cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); 837ba1ca37eSChristoph Hellwig return BLK_MQ_RQ_QUEUE_OK; 83857dacad5SJay Sternberg } 83957dacad5SJay Sternberg 84057dacad5SJay Sternberg /* 84157dacad5SJay Sternberg * NOTE: ns is NULL when called on the admin queue. 84257dacad5SJay Sternberg */ 84357dacad5SJay Sternberg static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 84457dacad5SJay Sternberg const struct blk_mq_queue_data *bd) 84557dacad5SJay Sternberg { 84657dacad5SJay Sternberg struct nvme_ns *ns = hctx->queue->queuedata; 84757dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 84857dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 84957dacad5SJay Sternberg struct request *req = bd->rq; 85057dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 85157dacad5SJay Sternberg struct nvme_iod *iod; 852ba1ca37eSChristoph Hellwig struct nvme_command cmnd; 853ba1ca37eSChristoph Hellwig int ret = BLK_MQ_RQ_QUEUE_OK; 85457dacad5SJay Sternberg 85557dacad5SJay Sternberg /* 85657dacad5SJay Sternberg * If formated with metadata, require the block layer provide a buffer 85757dacad5SJay Sternberg * unless this namespace is formated such that the metadata can be 85857dacad5SJay Sternberg * stripped/generated by the controller with PRACT=1. 85957dacad5SJay Sternberg */ 86057dacad5SJay Sternberg if (ns && ns->ms && !blk_integrity_rq(req)) { 86157dacad5SJay Sternberg if (!(ns->pi_type && ns->ms == 8) && 86257dacad5SJay Sternberg req->cmd_type != REQ_TYPE_DRV_PRIV) { 86357dacad5SJay Sternberg blk_mq_complete_request(req, -EFAULT); 86457dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 86557dacad5SJay Sternberg } 86657dacad5SJay Sternberg } 86757dacad5SJay Sternberg 86857dacad5SJay Sternberg iod = nvme_alloc_iod(req, dev, GFP_ATOMIC); 86957dacad5SJay Sternberg if (!iod) 87057dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_BUSY; 87157dacad5SJay Sternberg 87257dacad5SJay Sternberg if (req->cmd_flags & REQ_DISCARD) { 873ba1ca37eSChristoph Hellwig ret = nvme_setup_discard(nvmeq, ns, iod, &cmnd); 874ba1ca37eSChristoph Hellwig } else { 87557dacad5SJay Sternberg if (req->cmd_type == REQ_TYPE_DRV_PRIV) 876ba1ca37eSChristoph Hellwig memcpy(&cmnd, req->cmd, sizeof(cmnd)); 87757dacad5SJay Sternberg else if (req->cmd_flags & REQ_FLUSH) 878ba1ca37eSChristoph Hellwig nvme_setup_flush(ns, &cmnd); 87957dacad5SJay Sternberg else 880ba1ca37eSChristoph Hellwig nvme_setup_rw(ns, req, &cmnd); 88157dacad5SJay Sternberg 882ba1ca37eSChristoph Hellwig if (req->nr_phys_segments) 883ba1ca37eSChristoph Hellwig ret = nvme_map_data(dev, iod, &cmnd); 884ba1ca37eSChristoph Hellwig } 885ba1ca37eSChristoph Hellwig 886ba1ca37eSChristoph Hellwig if (ret) 887ba1ca37eSChristoph Hellwig goto out; 888ba1ca37eSChristoph Hellwig 889ba1ca37eSChristoph Hellwig cmnd.common.command_id = req->tag; 890ba1ca37eSChristoph Hellwig nvme_set_info(cmd, iod, req_completion); 891ba1ca37eSChristoph Hellwig 892ba1ca37eSChristoph Hellwig spin_lock_irq(&nvmeq->q_lock); 893ba1ca37eSChristoph Hellwig __nvme_submit_cmd(nvmeq, &cmnd); 89457dacad5SJay Sternberg nvme_process_cq(nvmeq); 89557dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 89657dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 897ba1ca37eSChristoph Hellwig out: 89857dacad5SJay Sternberg nvme_free_iod(dev, iod); 899ba1ca37eSChristoph Hellwig return ret; 90057dacad5SJay Sternberg } 90157dacad5SJay Sternberg 902a0fa9647SJens Axboe static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag) 90357dacad5SJay Sternberg { 90457dacad5SJay Sternberg u16 head, phase; 90557dacad5SJay Sternberg 90657dacad5SJay Sternberg head = nvmeq->cq_head; 90757dacad5SJay Sternberg phase = nvmeq->cq_phase; 90857dacad5SJay Sternberg 90957dacad5SJay Sternberg for (;;) { 91057dacad5SJay Sternberg void *ctx; 91157dacad5SJay Sternberg nvme_completion_fn fn; 91257dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[head]; 91357dacad5SJay Sternberg if ((le16_to_cpu(cqe.status) & 1) != phase) 91457dacad5SJay Sternberg break; 91557dacad5SJay Sternberg nvmeq->sq_head = le16_to_cpu(cqe.sq_head); 91657dacad5SJay Sternberg if (++head == nvmeq->q_depth) { 91757dacad5SJay Sternberg head = 0; 91857dacad5SJay Sternberg phase = !phase; 91957dacad5SJay Sternberg } 920a0fa9647SJens Axboe if (tag && *tag == cqe.command_id) 921a0fa9647SJens Axboe *tag = -1; 92257dacad5SJay Sternberg ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn); 92357dacad5SJay Sternberg fn(nvmeq, ctx, &cqe); 92457dacad5SJay Sternberg } 92557dacad5SJay Sternberg 92657dacad5SJay Sternberg /* If the controller ignores the cq head doorbell and continuously 92757dacad5SJay Sternberg * writes to the queue, it is theoretically possible to wrap around 92857dacad5SJay Sternberg * the queue twice and mistakenly return IRQ_NONE. Linux only 92957dacad5SJay Sternberg * requires that 0.1% of your interrupts are handled, so this isn't 93057dacad5SJay Sternberg * a big problem. 93157dacad5SJay Sternberg */ 93257dacad5SJay Sternberg if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) 933a0fa9647SJens Axboe return; 93457dacad5SJay Sternberg 935604e8c8dSKeith Busch if (likely(nvmeq->cq_vector >= 0)) 93657dacad5SJay Sternberg writel(head, nvmeq->q_db + nvmeq->dev->db_stride); 93757dacad5SJay Sternberg nvmeq->cq_head = head; 93857dacad5SJay Sternberg nvmeq->cq_phase = phase; 93957dacad5SJay Sternberg 94057dacad5SJay Sternberg nvmeq->cqe_seen = 1; 941a0fa9647SJens Axboe } 942a0fa9647SJens Axboe 943a0fa9647SJens Axboe static void nvme_process_cq(struct nvme_queue *nvmeq) 944a0fa9647SJens Axboe { 945a0fa9647SJens Axboe __nvme_process_cq(nvmeq, NULL); 94657dacad5SJay Sternberg } 94757dacad5SJay Sternberg 94857dacad5SJay Sternberg static irqreturn_t nvme_irq(int irq, void *data) 94957dacad5SJay Sternberg { 95057dacad5SJay Sternberg irqreturn_t result; 95157dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 95257dacad5SJay Sternberg spin_lock(&nvmeq->q_lock); 95357dacad5SJay Sternberg nvme_process_cq(nvmeq); 95457dacad5SJay Sternberg result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; 95557dacad5SJay Sternberg nvmeq->cqe_seen = 0; 95657dacad5SJay Sternberg spin_unlock(&nvmeq->q_lock); 95757dacad5SJay Sternberg return result; 95857dacad5SJay Sternberg } 95957dacad5SJay Sternberg 96057dacad5SJay Sternberg static irqreturn_t nvme_irq_check(int irq, void *data) 96157dacad5SJay Sternberg { 96257dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 96357dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; 96457dacad5SJay Sternberg if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) 96557dacad5SJay Sternberg return IRQ_NONE; 96657dacad5SJay Sternberg return IRQ_WAKE_THREAD; 96757dacad5SJay Sternberg } 96857dacad5SJay Sternberg 969a0fa9647SJens Axboe static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) 970a0fa9647SJens Axboe { 971a0fa9647SJens Axboe struct nvme_queue *nvmeq = hctx->driver_data; 972a0fa9647SJens Axboe 973a0fa9647SJens Axboe if ((le16_to_cpu(nvmeq->cqes[nvmeq->cq_head].status) & 1) == 974a0fa9647SJens Axboe nvmeq->cq_phase) { 975a0fa9647SJens Axboe spin_lock_irq(&nvmeq->q_lock); 976a0fa9647SJens Axboe __nvme_process_cq(nvmeq, &tag); 977a0fa9647SJens Axboe spin_unlock_irq(&nvmeq->q_lock); 978a0fa9647SJens Axboe 979a0fa9647SJens Axboe if (tag == -1) 980a0fa9647SJens Axboe return 1; 981a0fa9647SJens Axboe } 982a0fa9647SJens Axboe 983a0fa9647SJens Axboe return 0; 984a0fa9647SJens Axboe } 985a0fa9647SJens Axboe 98657dacad5SJay Sternberg static int nvme_submit_async_admin_req(struct nvme_dev *dev) 98757dacad5SJay Sternberg { 98857dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 98957dacad5SJay Sternberg struct nvme_command c; 99057dacad5SJay Sternberg struct nvme_cmd_info *cmd_info; 99157dacad5SJay Sternberg struct request *req; 99257dacad5SJay Sternberg 9931c63dc66SChristoph Hellwig req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE, 9946f3b0e8bSChristoph Hellwig BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED); 99557dacad5SJay Sternberg if (IS_ERR(req)) 99657dacad5SJay Sternberg return PTR_ERR(req); 99757dacad5SJay Sternberg 99857dacad5SJay Sternberg req->cmd_flags |= REQ_NO_TIMEOUT; 99957dacad5SJay Sternberg cmd_info = blk_mq_rq_to_pdu(req); 100057dacad5SJay Sternberg nvme_set_info(cmd_info, NULL, async_req_completion); 100157dacad5SJay Sternberg 100257dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 100357dacad5SJay Sternberg c.common.opcode = nvme_admin_async_event; 100457dacad5SJay Sternberg c.common.command_id = req->tag; 100557dacad5SJay Sternberg 100657dacad5SJay Sternberg blk_mq_free_request(req); 100757dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, &c); 100857dacad5SJay Sternberg return 0; 100957dacad5SJay Sternberg } 101057dacad5SJay Sternberg 101157dacad5SJay Sternberg static int nvme_submit_admin_async_cmd(struct nvme_dev *dev, 101257dacad5SJay Sternberg struct nvme_command *cmd, 101357dacad5SJay Sternberg struct async_cmd_info *cmdinfo, unsigned timeout) 101457dacad5SJay Sternberg { 101557dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 101657dacad5SJay Sternberg struct request *req; 101757dacad5SJay Sternberg struct nvme_cmd_info *cmd_rq; 101857dacad5SJay Sternberg 10191c63dc66SChristoph Hellwig req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE, 0); 102057dacad5SJay Sternberg if (IS_ERR(req)) 102157dacad5SJay Sternberg return PTR_ERR(req); 102257dacad5SJay Sternberg 102357dacad5SJay Sternberg req->timeout = timeout; 102457dacad5SJay Sternberg cmd_rq = blk_mq_rq_to_pdu(req); 102557dacad5SJay Sternberg cmdinfo->req = req; 102657dacad5SJay Sternberg nvme_set_info(cmd_rq, cmdinfo, async_completion); 102757dacad5SJay Sternberg cmdinfo->status = -EINTR; 102857dacad5SJay Sternberg 102957dacad5SJay Sternberg cmd->common.command_id = req->tag; 103057dacad5SJay Sternberg 103157dacad5SJay Sternberg nvme_submit_cmd(nvmeq, cmd); 103257dacad5SJay Sternberg return 0; 103357dacad5SJay Sternberg } 103457dacad5SJay Sternberg 103557dacad5SJay Sternberg static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) 103657dacad5SJay Sternberg { 103757dacad5SJay Sternberg struct nvme_command c; 103857dacad5SJay Sternberg 103957dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 104057dacad5SJay Sternberg c.delete_queue.opcode = opcode; 104157dacad5SJay Sternberg c.delete_queue.qid = cpu_to_le16(id); 104257dacad5SJay Sternberg 10431c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 104457dacad5SJay Sternberg } 104557dacad5SJay Sternberg 104657dacad5SJay Sternberg static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, 104757dacad5SJay Sternberg struct nvme_queue *nvmeq) 104857dacad5SJay Sternberg { 104957dacad5SJay Sternberg struct nvme_command c; 105057dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; 105157dacad5SJay Sternberg 105257dacad5SJay Sternberg /* 105357dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 105457dacad5SJay Sternberg * is attached to the request. 105557dacad5SJay Sternberg */ 105657dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 105757dacad5SJay Sternberg c.create_cq.opcode = nvme_admin_create_cq; 105857dacad5SJay Sternberg c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); 105957dacad5SJay Sternberg c.create_cq.cqid = cpu_to_le16(qid); 106057dacad5SJay Sternberg c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 106157dacad5SJay Sternberg c.create_cq.cq_flags = cpu_to_le16(flags); 106257dacad5SJay Sternberg c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); 106357dacad5SJay Sternberg 10641c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 106557dacad5SJay Sternberg } 106657dacad5SJay Sternberg 106757dacad5SJay Sternberg static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, 106857dacad5SJay Sternberg struct nvme_queue *nvmeq) 106957dacad5SJay Sternberg { 107057dacad5SJay Sternberg struct nvme_command c; 107157dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; 107257dacad5SJay Sternberg 107357dacad5SJay Sternberg /* 107457dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 107557dacad5SJay Sternberg * is attached to the request. 107657dacad5SJay Sternberg */ 107757dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 107857dacad5SJay Sternberg c.create_sq.opcode = nvme_admin_create_sq; 107957dacad5SJay Sternberg c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); 108057dacad5SJay Sternberg c.create_sq.sqid = cpu_to_le16(qid); 108157dacad5SJay Sternberg c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 108257dacad5SJay Sternberg c.create_sq.sq_flags = cpu_to_le16(flags); 108357dacad5SJay Sternberg c.create_sq.cqid = cpu_to_le16(qid); 108457dacad5SJay Sternberg 10851c63dc66SChristoph Hellwig return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0); 108657dacad5SJay Sternberg } 108757dacad5SJay Sternberg 108857dacad5SJay Sternberg static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) 108957dacad5SJay Sternberg { 109057dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); 109157dacad5SJay Sternberg } 109257dacad5SJay Sternberg 109357dacad5SJay Sternberg static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) 109457dacad5SJay Sternberg { 109557dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); 109657dacad5SJay Sternberg } 109757dacad5SJay Sternberg 109857dacad5SJay Sternberg /** 109957dacad5SJay Sternberg * nvme_abort_req - Attempt aborting a request 110057dacad5SJay Sternberg * 110157dacad5SJay Sternberg * Schedule controller reset if the command was already aborted once before and 110257dacad5SJay Sternberg * still hasn't been returned to the driver, or if this is the admin queue. 110357dacad5SJay Sternberg */ 110457dacad5SJay Sternberg static void nvme_abort_req(struct request *req) 110557dacad5SJay Sternberg { 110657dacad5SJay Sternberg struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); 110757dacad5SJay Sternberg struct nvme_queue *nvmeq = cmd_rq->nvmeq; 110857dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 110957dacad5SJay Sternberg struct request *abort_req; 111057dacad5SJay Sternberg struct nvme_cmd_info *abort_cmd; 111157dacad5SJay Sternberg struct nvme_command cmd; 111257dacad5SJay Sternberg 111357dacad5SJay Sternberg if (!nvmeq->qid || cmd_rq->aborted) { 111457dacad5SJay Sternberg spin_lock(&dev_list_lock); 111557dacad5SJay Sternberg if (!__nvme_reset(dev)) { 111657dacad5SJay Sternberg dev_warn(dev->dev, 111757dacad5SJay Sternberg "I/O %d QID %d timeout, reset controller\n", 111857dacad5SJay Sternberg req->tag, nvmeq->qid); 111957dacad5SJay Sternberg } 112057dacad5SJay Sternberg spin_unlock(&dev_list_lock); 112157dacad5SJay Sternberg return; 112257dacad5SJay Sternberg } 112357dacad5SJay Sternberg 11241c63dc66SChristoph Hellwig if (!dev->ctrl.abort_limit) 112557dacad5SJay Sternberg return; 112657dacad5SJay Sternberg 11271c63dc66SChristoph Hellwig abort_req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE, 11286f3b0e8bSChristoph Hellwig BLK_MQ_REQ_NOWAIT); 112957dacad5SJay Sternberg if (IS_ERR(abort_req)) 113057dacad5SJay Sternberg return; 113157dacad5SJay Sternberg 113257dacad5SJay Sternberg abort_cmd = blk_mq_rq_to_pdu(abort_req); 113357dacad5SJay Sternberg nvme_set_info(abort_cmd, abort_req, abort_completion); 113457dacad5SJay Sternberg 113557dacad5SJay Sternberg memset(&cmd, 0, sizeof(cmd)); 113657dacad5SJay Sternberg cmd.abort.opcode = nvme_admin_abort_cmd; 113757dacad5SJay Sternberg cmd.abort.cid = req->tag; 113857dacad5SJay Sternberg cmd.abort.sqid = cpu_to_le16(nvmeq->qid); 113957dacad5SJay Sternberg cmd.abort.command_id = abort_req->tag; 114057dacad5SJay Sternberg 11411c63dc66SChristoph Hellwig --dev->ctrl.abort_limit; 114257dacad5SJay Sternberg cmd_rq->aborted = 1; 114357dacad5SJay Sternberg 114457dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", req->tag, 114557dacad5SJay Sternberg nvmeq->qid); 114657dacad5SJay Sternberg nvme_submit_cmd(dev->queues[0], &cmd); 114757dacad5SJay Sternberg } 114857dacad5SJay Sternberg 114957dacad5SJay Sternberg static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved) 115057dacad5SJay Sternberg { 115157dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 115257dacad5SJay Sternberg void *ctx; 115357dacad5SJay Sternberg nvme_completion_fn fn; 115457dacad5SJay Sternberg struct nvme_cmd_info *cmd; 115557dacad5SJay Sternberg struct nvme_completion cqe; 115657dacad5SJay Sternberg 115757dacad5SJay Sternberg if (!blk_mq_request_started(req)) 115857dacad5SJay Sternberg return; 115957dacad5SJay Sternberg 116057dacad5SJay Sternberg cmd = blk_mq_rq_to_pdu(req); 116157dacad5SJay Sternberg 116257dacad5SJay Sternberg if (cmd->ctx == CMD_CTX_CANCELLED) 116357dacad5SJay Sternberg return; 116457dacad5SJay Sternberg 116557dacad5SJay Sternberg if (blk_queue_dying(req->q)) 116657dacad5SJay Sternberg cqe.status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1); 116757dacad5SJay Sternberg else 116857dacad5SJay Sternberg cqe.status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); 116957dacad5SJay Sternberg 117057dacad5SJay Sternberg 117157dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n", 117257dacad5SJay Sternberg req->tag, nvmeq->qid); 117357dacad5SJay Sternberg ctx = cancel_cmd_info(cmd, &fn); 117457dacad5SJay Sternberg fn(nvmeq, ctx, &cqe); 117557dacad5SJay Sternberg } 117657dacad5SJay Sternberg 117757dacad5SJay Sternberg static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) 117857dacad5SJay Sternberg { 117957dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 118057dacad5SJay Sternberg struct nvme_queue *nvmeq = cmd->nvmeq; 118157dacad5SJay Sternberg 118257dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Timeout I/O %d QID %d\n", req->tag, 118357dacad5SJay Sternberg nvmeq->qid); 118457dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 118557dacad5SJay Sternberg nvme_abort_req(req); 118657dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 118757dacad5SJay Sternberg 118857dacad5SJay Sternberg /* 118957dacad5SJay Sternberg * The aborted req will be completed on receiving the abort req. 119057dacad5SJay Sternberg * We enable the timer again. If hit twice, it'll cause a device reset, 119157dacad5SJay Sternberg * as the device then is in a faulty state. 119257dacad5SJay Sternberg */ 119357dacad5SJay Sternberg return BLK_EH_RESET_TIMER; 119457dacad5SJay Sternberg } 119557dacad5SJay Sternberg 119657dacad5SJay Sternberg static void nvme_free_queue(struct nvme_queue *nvmeq) 119757dacad5SJay Sternberg { 119857dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), 119957dacad5SJay Sternberg (void *)nvmeq->cqes, nvmeq->cq_dma_addr); 120057dacad5SJay Sternberg if (nvmeq->sq_cmds) 120157dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), 120257dacad5SJay Sternberg nvmeq->sq_cmds, nvmeq->sq_dma_addr); 120357dacad5SJay Sternberg kfree(nvmeq); 120457dacad5SJay Sternberg } 120557dacad5SJay Sternberg 120657dacad5SJay Sternberg static void nvme_free_queues(struct nvme_dev *dev, int lowest) 120757dacad5SJay Sternberg { 120857dacad5SJay Sternberg int i; 120957dacad5SJay Sternberg 121057dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= lowest; i--) { 121157dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 121257dacad5SJay Sternberg dev->queue_count--; 121357dacad5SJay Sternberg dev->queues[i] = NULL; 121457dacad5SJay Sternberg nvme_free_queue(nvmeq); 121557dacad5SJay Sternberg } 121657dacad5SJay Sternberg } 121757dacad5SJay Sternberg 121857dacad5SJay Sternberg /** 121957dacad5SJay Sternberg * nvme_suspend_queue - put queue into suspended state 122057dacad5SJay Sternberg * @nvmeq - queue to suspend 122157dacad5SJay Sternberg */ 122257dacad5SJay Sternberg static int nvme_suspend_queue(struct nvme_queue *nvmeq) 122357dacad5SJay Sternberg { 122457dacad5SJay Sternberg int vector; 122557dacad5SJay Sternberg 122657dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 122757dacad5SJay Sternberg if (nvmeq->cq_vector == -1) { 122857dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 122957dacad5SJay Sternberg return 1; 123057dacad5SJay Sternberg } 123157dacad5SJay Sternberg vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; 123257dacad5SJay Sternberg nvmeq->dev->online_queues--; 123357dacad5SJay Sternberg nvmeq->cq_vector = -1; 123457dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 123557dacad5SJay Sternberg 12361c63dc66SChristoph Hellwig if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) 12371c63dc66SChristoph Hellwig blk_mq_freeze_queue_start(nvmeq->dev->ctrl.admin_q); 123857dacad5SJay Sternberg 123957dacad5SJay Sternberg irq_set_affinity_hint(vector, NULL); 124057dacad5SJay Sternberg free_irq(vector, nvmeq); 124157dacad5SJay Sternberg 124257dacad5SJay Sternberg return 0; 124357dacad5SJay Sternberg } 124457dacad5SJay Sternberg 124557dacad5SJay Sternberg static void nvme_clear_queue(struct nvme_queue *nvmeq) 124657dacad5SJay Sternberg { 124757dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 124857dacad5SJay Sternberg if (nvmeq->tags && *nvmeq->tags) 124957dacad5SJay Sternberg blk_mq_all_tag_busy_iter(*nvmeq->tags, nvme_cancel_queue_ios, nvmeq); 125057dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 125157dacad5SJay Sternberg } 125257dacad5SJay Sternberg 125357dacad5SJay Sternberg static void nvme_disable_queue(struct nvme_dev *dev, int qid) 125457dacad5SJay Sternberg { 125557dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[qid]; 125657dacad5SJay Sternberg 125757dacad5SJay Sternberg if (!nvmeq) 125857dacad5SJay Sternberg return; 125957dacad5SJay Sternberg if (nvme_suspend_queue(nvmeq)) 126057dacad5SJay Sternberg return; 126157dacad5SJay Sternberg 126257dacad5SJay Sternberg /* Don't tell the adapter to delete the admin queue. 126357dacad5SJay Sternberg * Don't tell a removed adapter to delete IO queues. */ 12647a67cbeaSChristoph Hellwig if (qid && readl(dev->bar + NVME_REG_CSTS) != -1) { 126557dacad5SJay Sternberg adapter_delete_sq(dev, qid); 126657dacad5SJay Sternberg adapter_delete_cq(dev, qid); 126757dacad5SJay Sternberg } 126857dacad5SJay Sternberg 126957dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 127057dacad5SJay Sternberg nvme_process_cq(nvmeq); 127157dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 127257dacad5SJay Sternberg } 127357dacad5SJay Sternberg 127457dacad5SJay Sternberg static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, 127557dacad5SJay Sternberg int entry_size) 127657dacad5SJay Sternberg { 127757dacad5SJay Sternberg int q_depth = dev->q_depth; 127857dacad5SJay Sternberg unsigned q_size_aligned = roundup(q_depth * entry_size, dev->page_size); 127957dacad5SJay Sternberg 128057dacad5SJay Sternberg if (q_size_aligned * nr_io_queues > dev->cmb_size) { 128157dacad5SJay Sternberg u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); 128257dacad5SJay Sternberg mem_per_q = round_down(mem_per_q, dev->page_size); 128357dacad5SJay Sternberg q_depth = div_u64(mem_per_q, entry_size); 128457dacad5SJay Sternberg 128557dacad5SJay Sternberg /* 128657dacad5SJay Sternberg * Ensure the reduced q_depth is above some threshold where it 128757dacad5SJay Sternberg * would be better to map queues in system memory with the 128857dacad5SJay Sternberg * original depth 128957dacad5SJay Sternberg */ 129057dacad5SJay Sternberg if (q_depth < 64) 129157dacad5SJay Sternberg return -ENOMEM; 129257dacad5SJay Sternberg } 129357dacad5SJay Sternberg 129457dacad5SJay Sternberg return q_depth; 129557dacad5SJay Sternberg } 129657dacad5SJay Sternberg 129757dacad5SJay Sternberg static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, 129857dacad5SJay Sternberg int qid, int depth) 129957dacad5SJay Sternberg { 130057dacad5SJay Sternberg if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { 130157dacad5SJay Sternberg unsigned offset = (qid - 1) * 130257dacad5SJay Sternberg roundup(SQ_SIZE(depth), dev->page_size); 130357dacad5SJay Sternberg nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; 130457dacad5SJay Sternberg nvmeq->sq_cmds_io = dev->cmb + offset; 130557dacad5SJay Sternberg } else { 130657dacad5SJay Sternberg nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), 130757dacad5SJay Sternberg &nvmeq->sq_dma_addr, GFP_KERNEL); 130857dacad5SJay Sternberg if (!nvmeq->sq_cmds) 130957dacad5SJay Sternberg return -ENOMEM; 131057dacad5SJay Sternberg } 131157dacad5SJay Sternberg 131257dacad5SJay Sternberg return 0; 131357dacad5SJay Sternberg } 131457dacad5SJay Sternberg 131557dacad5SJay Sternberg static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, 131657dacad5SJay Sternberg int depth) 131757dacad5SJay Sternberg { 131857dacad5SJay Sternberg struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL); 131957dacad5SJay Sternberg if (!nvmeq) 132057dacad5SJay Sternberg return NULL; 132157dacad5SJay Sternberg 132257dacad5SJay Sternberg nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), 132357dacad5SJay Sternberg &nvmeq->cq_dma_addr, GFP_KERNEL); 132457dacad5SJay Sternberg if (!nvmeq->cqes) 132557dacad5SJay Sternberg goto free_nvmeq; 132657dacad5SJay Sternberg 132757dacad5SJay Sternberg if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) 132857dacad5SJay Sternberg goto free_cqdma; 132957dacad5SJay Sternberg 133057dacad5SJay Sternberg nvmeq->q_dmadev = dev->dev; 133157dacad5SJay Sternberg nvmeq->dev = dev; 133257dacad5SJay Sternberg snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", 13331c63dc66SChristoph Hellwig dev->ctrl.instance, qid); 133457dacad5SJay Sternberg spin_lock_init(&nvmeq->q_lock); 133557dacad5SJay Sternberg nvmeq->cq_head = 0; 133657dacad5SJay Sternberg nvmeq->cq_phase = 1; 133757dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 133857dacad5SJay Sternberg nvmeq->q_depth = depth; 133957dacad5SJay Sternberg nvmeq->qid = qid; 134057dacad5SJay Sternberg nvmeq->cq_vector = -1; 134157dacad5SJay Sternberg dev->queues[qid] = nvmeq; 134257dacad5SJay Sternberg 134357dacad5SJay Sternberg /* make sure queue descriptor is set before queue count, for kthread */ 134457dacad5SJay Sternberg mb(); 134557dacad5SJay Sternberg dev->queue_count++; 134657dacad5SJay Sternberg 134757dacad5SJay Sternberg return nvmeq; 134857dacad5SJay Sternberg 134957dacad5SJay Sternberg free_cqdma: 135057dacad5SJay Sternberg dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, 135157dacad5SJay Sternberg nvmeq->cq_dma_addr); 135257dacad5SJay Sternberg free_nvmeq: 135357dacad5SJay Sternberg kfree(nvmeq); 135457dacad5SJay Sternberg return NULL; 135557dacad5SJay Sternberg } 135657dacad5SJay Sternberg 135757dacad5SJay Sternberg static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, 135857dacad5SJay Sternberg const char *name) 135957dacad5SJay Sternberg { 136057dacad5SJay Sternberg if (use_threaded_interrupts) 136157dacad5SJay Sternberg return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, 136257dacad5SJay Sternberg nvme_irq_check, nvme_irq, IRQF_SHARED, 136357dacad5SJay Sternberg name, nvmeq); 136457dacad5SJay Sternberg return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, 136557dacad5SJay Sternberg IRQF_SHARED, name, nvmeq); 136657dacad5SJay Sternberg } 136757dacad5SJay Sternberg 136857dacad5SJay Sternberg static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) 136957dacad5SJay Sternberg { 137057dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 137157dacad5SJay Sternberg 137257dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 137357dacad5SJay Sternberg nvmeq->sq_tail = 0; 137457dacad5SJay Sternberg nvmeq->cq_head = 0; 137557dacad5SJay Sternberg nvmeq->cq_phase = 1; 137657dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 137757dacad5SJay Sternberg memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); 137857dacad5SJay Sternberg dev->online_queues++; 137957dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 138057dacad5SJay Sternberg } 138157dacad5SJay Sternberg 138257dacad5SJay Sternberg static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) 138357dacad5SJay Sternberg { 138457dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 138557dacad5SJay Sternberg int result; 138657dacad5SJay Sternberg 138757dacad5SJay Sternberg nvmeq->cq_vector = qid - 1; 138857dacad5SJay Sternberg result = adapter_alloc_cq(dev, qid, nvmeq); 138957dacad5SJay Sternberg if (result < 0) 139057dacad5SJay Sternberg return result; 139157dacad5SJay Sternberg 139257dacad5SJay Sternberg result = adapter_alloc_sq(dev, qid, nvmeq); 139357dacad5SJay Sternberg if (result < 0) 139457dacad5SJay Sternberg goto release_cq; 139557dacad5SJay Sternberg 139657dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 139757dacad5SJay Sternberg if (result < 0) 139857dacad5SJay Sternberg goto release_sq; 139957dacad5SJay Sternberg 140057dacad5SJay Sternberg nvme_init_queue(nvmeq, qid); 140157dacad5SJay Sternberg return result; 140257dacad5SJay Sternberg 140357dacad5SJay Sternberg release_sq: 140457dacad5SJay Sternberg adapter_delete_sq(dev, qid); 140557dacad5SJay Sternberg release_cq: 140657dacad5SJay Sternberg adapter_delete_cq(dev, qid); 140757dacad5SJay Sternberg return result; 140857dacad5SJay Sternberg } 140957dacad5SJay Sternberg 141057dacad5SJay Sternberg static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled) 141157dacad5SJay Sternberg { 141257dacad5SJay Sternberg unsigned long timeout; 141357dacad5SJay Sternberg u32 bit = enabled ? NVME_CSTS_RDY : 0; 141457dacad5SJay Sternberg 141557dacad5SJay Sternberg timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; 141657dacad5SJay Sternberg 14177a67cbeaSChristoph Hellwig while ((readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_RDY) != bit) { 141857dacad5SJay Sternberg msleep(100); 141957dacad5SJay Sternberg if (fatal_signal_pending(current)) 142057dacad5SJay Sternberg return -EINTR; 142157dacad5SJay Sternberg if (time_after(jiffies, timeout)) { 142257dacad5SJay Sternberg dev_err(dev->dev, 142357dacad5SJay Sternberg "Device not ready; aborting %s\n", enabled ? 142457dacad5SJay Sternberg "initialisation" : "reset"); 142557dacad5SJay Sternberg return -ENODEV; 142657dacad5SJay Sternberg } 142757dacad5SJay Sternberg } 142857dacad5SJay Sternberg 142957dacad5SJay Sternberg return 0; 143057dacad5SJay Sternberg } 143157dacad5SJay Sternberg 143257dacad5SJay Sternberg /* 143357dacad5SJay Sternberg * If the device has been passed off to us in an enabled state, just clear 143457dacad5SJay Sternberg * the enabled bit. The spec says we should set the 'shutdown notification 143557dacad5SJay Sternberg * bits', but doing so may cause the device to complete commands to the 143657dacad5SJay Sternberg * admin queue ... and we don't know what memory that might be pointing at! 143757dacad5SJay Sternberg */ 143857dacad5SJay Sternberg static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap) 143957dacad5SJay Sternberg { 144057dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_SHN_MASK; 144157dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_ENABLE; 14427a67cbeaSChristoph Hellwig writel(dev->ctrl_config, dev->bar + NVME_REG_CC); 144357dacad5SJay Sternberg 144457dacad5SJay Sternberg return nvme_wait_ready(dev, cap, false); 144557dacad5SJay Sternberg } 144657dacad5SJay Sternberg 144757dacad5SJay Sternberg static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap) 144857dacad5SJay Sternberg { 144957dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_SHN_MASK; 145057dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_ENABLE; 14517a67cbeaSChristoph Hellwig writel(dev->ctrl_config, dev->bar + NVME_REG_CC); 145257dacad5SJay Sternberg 145357dacad5SJay Sternberg return nvme_wait_ready(dev, cap, true); 145457dacad5SJay Sternberg } 145557dacad5SJay Sternberg 145657dacad5SJay Sternberg static int nvme_shutdown_ctrl(struct nvme_dev *dev) 145757dacad5SJay Sternberg { 145857dacad5SJay Sternberg unsigned long timeout; 145957dacad5SJay Sternberg 146057dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_SHN_MASK; 146157dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_SHN_NORMAL; 146257dacad5SJay Sternberg 14637a67cbeaSChristoph Hellwig writel(dev->ctrl_config, dev->bar + NVME_REG_CC); 146457dacad5SJay Sternberg 146557dacad5SJay Sternberg timeout = SHUTDOWN_TIMEOUT + jiffies; 14667a67cbeaSChristoph Hellwig while ((readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_SHST_MASK) != 146757dacad5SJay Sternberg NVME_CSTS_SHST_CMPLT) { 146857dacad5SJay Sternberg msleep(100); 146957dacad5SJay Sternberg if (fatal_signal_pending(current)) 147057dacad5SJay Sternberg return -EINTR; 147157dacad5SJay Sternberg if (time_after(jiffies, timeout)) { 147257dacad5SJay Sternberg dev_err(dev->dev, 147357dacad5SJay Sternberg "Device shutdown incomplete; abort shutdown\n"); 147457dacad5SJay Sternberg return -ENODEV; 147557dacad5SJay Sternberg } 147657dacad5SJay Sternberg } 147757dacad5SJay Sternberg 147857dacad5SJay Sternberg return 0; 147957dacad5SJay Sternberg } 148057dacad5SJay Sternberg 148157dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_admin_ops = { 148257dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 148357dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 148457dacad5SJay Sternberg .init_hctx = nvme_admin_init_hctx, 148557dacad5SJay Sternberg .exit_hctx = nvme_admin_exit_hctx, 148657dacad5SJay Sternberg .init_request = nvme_admin_init_request, 148757dacad5SJay Sternberg .timeout = nvme_timeout, 148857dacad5SJay Sternberg }; 148957dacad5SJay Sternberg 149057dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_ops = { 149157dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 149257dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 149357dacad5SJay Sternberg .init_hctx = nvme_init_hctx, 149457dacad5SJay Sternberg .init_request = nvme_init_request, 149557dacad5SJay Sternberg .timeout = nvme_timeout, 1496a0fa9647SJens Axboe .poll = nvme_poll, 149757dacad5SJay Sternberg }; 149857dacad5SJay Sternberg 149957dacad5SJay Sternberg static void nvme_dev_remove_admin(struct nvme_dev *dev) 150057dacad5SJay Sternberg { 15011c63dc66SChristoph Hellwig if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) { 15021c63dc66SChristoph Hellwig blk_cleanup_queue(dev->ctrl.admin_q); 150357dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 150457dacad5SJay Sternberg } 150557dacad5SJay Sternberg } 150657dacad5SJay Sternberg 150757dacad5SJay Sternberg static int nvme_alloc_admin_tags(struct nvme_dev *dev) 150857dacad5SJay Sternberg { 15091c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q) { 151057dacad5SJay Sternberg dev->admin_tagset.ops = &nvme_mq_admin_ops; 151157dacad5SJay Sternberg dev->admin_tagset.nr_hw_queues = 1; 151257dacad5SJay Sternberg dev->admin_tagset.queue_depth = NVME_AQ_DEPTH - 1; 151357dacad5SJay Sternberg dev->admin_tagset.reserved_tags = 1; 151457dacad5SJay Sternberg dev->admin_tagset.timeout = ADMIN_TIMEOUT; 151557dacad5SJay Sternberg dev->admin_tagset.numa_node = dev_to_node(dev->dev); 151657dacad5SJay Sternberg dev->admin_tagset.cmd_size = nvme_cmd_size(dev); 151757dacad5SJay Sternberg dev->admin_tagset.driver_data = dev; 151857dacad5SJay Sternberg 151957dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->admin_tagset)) 152057dacad5SJay Sternberg return -ENOMEM; 152157dacad5SJay Sternberg 15221c63dc66SChristoph Hellwig dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); 15231c63dc66SChristoph Hellwig if (IS_ERR(dev->ctrl.admin_q)) { 152457dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 152557dacad5SJay Sternberg return -ENOMEM; 152657dacad5SJay Sternberg } 15271c63dc66SChristoph Hellwig if (!blk_get_queue(dev->ctrl.admin_q)) { 152857dacad5SJay Sternberg nvme_dev_remove_admin(dev); 15291c63dc66SChristoph Hellwig dev->ctrl.admin_q = NULL; 153057dacad5SJay Sternberg return -ENODEV; 153157dacad5SJay Sternberg } 153257dacad5SJay Sternberg } else 15331c63dc66SChristoph Hellwig blk_mq_unfreeze_queue(dev->ctrl.admin_q); 153457dacad5SJay Sternberg 153557dacad5SJay Sternberg return 0; 153657dacad5SJay Sternberg } 153757dacad5SJay Sternberg 153857dacad5SJay Sternberg static int nvme_configure_admin_queue(struct nvme_dev *dev) 153957dacad5SJay Sternberg { 154057dacad5SJay Sternberg int result; 154157dacad5SJay Sternberg u32 aqa; 15427a67cbeaSChristoph Hellwig u64 cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 154357dacad5SJay Sternberg struct nvme_queue *nvmeq; 1544c5c9f25bSNishanth Aravamudan /* 1545c5c9f25bSNishanth Aravamudan * default to a 4K page size, with the intention to update this 1546c5c9f25bSNishanth Aravamudan * path in the future to accomodate architectures with differing 1547c5c9f25bSNishanth Aravamudan * kernel and IO page sizes. 1548c5c9f25bSNishanth Aravamudan */ 1549c5c9f25bSNishanth Aravamudan unsigned page_shift = 12; 155057dacad5SJay Sternberg unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12; 155157dacad5SJay Sternberg 155257dacad5SJay Sternberg if (page_shift < dev_page_min) { 155357dacad5SJay Sternberg dev_err(dev->dev, 155457dacad5SJay Sternberg "Minimum device page size (%u) too large for " 155557dacad5SJay Sternberg "host (%u)\n", 1 << dev_page_min, 155657dacad5SJay Sternberg 1 << page_shift); 155757dacad5SJay Sternberg return -ENODEV; 155857dacad5SJay Sternberg } 155957dacad5SJay Sternberg 15607a67cbeaSChristoph Hellwig dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1) ? 156157dacad5SJay Sternberg NVME_CAP_NSSRC(cap) : 0; 156257dacad5SJay Sternberg 15637a67cbeaSChristoph Hellwig if (dev->subsystem && 15647a67cbeaSChristoph Hellwig (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO)) 15657a67cbeaSChristoph Hellwig writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS); 156657dacad5SJay Sternberg 156757dacad5SJay Sternberg result = nvme_disable_ctrl(dev, cap); 156857dacad5SJay Sternberg if (result < 0) 156957dacad5SJay Sternberg return result; 157057dacad5SJay Sternberg 157157dacad5SJay Sternberg nvmeq = dev->queues[0]; 157257dacad5SJay Sternberg if (!nvmeq) { 157357dacad5SJay Sternberg nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); 157457dacad5SJay Sternberg if (!nvmeq) 157557dacad5SJay Sternberg return -ENOMEM; 157657dacad5SJay Sternberg } 157757dacad5SJay Sternberg 157857dacad5SJay Sternberg aqa = nvmeq->q_depth - 1; 157957dacad5SJay Sternberg aqa |= aqa << 16; 158057dacad5SJay Sternberg 158157dacad5SJay Sternberg dev->page_size = 1 << page_shift; 158257dacad5SJay Sternberg 158357dacad5SJay Sternberg dev->ctrl_config = NVME_CC_CSS_NVM; 158457dacad5SJay Sternberg dev->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; 158557dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; 158657dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; 158757dacad5SJay Sternberg 15887a67cbeaSChristoph Hellwig writel(aqa, dev->bar + NVME_REG_AQA); 15897a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ); 15907a67cbeaSChristoph Hellwig lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ); 159157dacad5SJay Sternberg 159257dacad5SJay Sternberg result = nvme_enable_ctrl(dev, cap); 159357dacad5SJay Sternberg if (result) 159457dacad5SJay Sternberg goto free_nvmeq; 159557dacad5SJay Sternberg 159657dacad5SJay Sternberg nvmeq->cq_vector = 0; 159757dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 159857dacad5SJay Sternberg if (result) { 159957dacad5SJay Sternberg nvmeq->cq_vector = -1; 160057dacad5SJay Sternberg goto free_nvmeq; 160157dacad5SJay Sternberg } 160257dacad5SJay Sternberg 160357dacad5SJay Sternberg return result; 160457dacad5SJay Sternberg 160557dacad5SJay Sternberg free_nvmeq: 160657dacad5SJay Sternberg nvme_free_queues(dev, 0); 160757dacad5SJay Sternberg return result; 160857dacad5SJay Sternberg } 160957dacad5SJay Sternberg 161057dacad5SJay Sternberg static int nvme_subsys_reset(struct nvme_dev *dev) 161157dacad5SJay Sternberg { 161257dacad5SJay Sternberg if (!dev->subsystem) 161357dacad5SJay Sternberg return -ENOTTY; 161457dacad5SJay Sternberg 16157a67cbeaSChristoph Hellwig writel(0x4E564D65, dev->bar + NVME_REG_NSSR); /* "NVMe" */ 161657dacad5SJay Sternberg return 0; 161757dacad5SJay Sternberg } 161857dacad5SJay Sternberg 161957dacad5SJay Sternberg static int nvme_kthread(void *data) 162057dacad5SJay Sternberg { 162157dacad5SJay Sternberg struct nvme_dev *dev, *next; 162257dacad5SJay Sternberg 162357dacad5SJay Sternberg while (!kthread_should_stop()) { 162457dacad5SJay Sternberg set_current_state(TASK_INTERRUPTIBLE); 162557dacad5SJay Sternberg spin_lock(&dev_list_lock); 162657dacad5SJay Sternberg list_for_each_entry_safe(dev, next, &dev_list, node) { 162757dacad5SJay Sternberg int i; 16287a67cbeaSChristoph Hellwig u32 csts = readl(dev->bar + NVME_REG_CSTS); 162957dacad5SJay Sternberg 163057dacad5SJay Sternberg if ((dev->subsystem && (csts & NVME_CSTS_NSSRO)) || 163157dacad5SJay Sternberg csts & NVME_CSTS_CFS) { 163257dacad5SJay Sternberg if (!__nvme_reset(dev)) { 163357dacad5SJay Sternberg dev_warn(dev->dev, 163457dacad5SJay Sternberg "Failed status: %x, reset controller\n", 16357a67cbeaSChristoph Hellwig readl(dev->bar + NVME_REG_CSTS)); 163657dacad5SJay Sternberg } 163757dacad5SJay Sternberg continue; 163857dacad5SJay Sternberg } 163957dacad5SJay Sternberg for (i = 0; i < dev->queue_count; i++) { 164057dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 164157dacad5SJay Sternberg if (!nvmeq) 164257dacad5SJay Sternberg continue; 164357dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 164457dacad5SJay Sternberg nvme_process_cq(nvmeq); 164557dacad5SJay Sternberg 16461c63dc66SChristoph Hellwig while (i == 0 && dev->ctrl.event_limit > 0) { 164757dacad5SJay Sternberg if (nvme_submit_async_admin_req(dev)) 164857dacad5SJay Sternberg break; 16491c63dc66SChristoph Hellwig dev->ctrl.event_limit--; 165057dacad5SJay Sternberg } 165157dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 165257dacad5SJay Sternberg } 165357dacad5SJay Sternberg } 165457dacad5SJay Sternberg spin_unlock(&dev_list_lock); 165557dacad5SJay Sternberg schedule_timeout(round_jiffies_relative(HZ)); 165657dacad5SJay Sternberg } 165757dacad5SJay Sternberg return 0; 165857dacad5SJay Sternberg } 165957dacad5SJay Sternberg 166057dacad5SJay Sternberg static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid) 166157dacad5SJay Sternberg { 166257dacad5SJay Sternberg struct nvme_ns *ns; 166357dacad5SJay Sternberg struct gendisk *disk; 166457dacad5SJay Sternberg int node = dev_to_node(dev->dev); 166557dacad5SJay Sternberg 166657dacad5SJay Sternberg ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); 166757dacad5SJay Sternberg if (!ns) 166857dacad5SJay Sternberg return; 166957dacad5SJay Sternberg 167057dacad5SJay Sternberg ns->queue = blk_mq_init_queue(&dev->tagset); 167157dacad5SJay Sternberg if (IS_ERR(ns->queue)) 167257dacad5SJay Sternberg goto out_free_ns; 167357dacad5SJay Sternberg queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue); 167457dacad5SJay Sternberg queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); 16751c63dc66SChristoph Hellwig ns->ctrl = &dev->ctrl; 167657dacad5SJay Sternberg ns->queue->queuedata = ns; 167757dacad5SJay Sternberg 167857dacad5SJay Sternberg disk = alloc_disk_node(0, node); 167957dacad5SJay Sternberg if (!disk) 168057dacad5SJay Sternberg goto out_free_queue; 168157dacad5SJay Sternberg 168257dacad5SJay Sternberg kref_init(&ns->kref); 168357dacad5SJay Sternberg ns->ns_id = nsid; 168457dacad5SJay Sternberg ns->disk = disk; 168557dacad5SJay Sternberg ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ 168657dacad5SJay Sternberg list_add_tail(&ns->list, &dev->namespaces); 168757dacad5SJay Sternberg 168857dacad5SJay Sternberg blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); 168957dacad5SJay Sternberg if (dev->max_hw_sectors) { 169057dacad5SJay Sternberg blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors); 169157dacad5SJay Sternberg blk_queue_max_segments(ns->queue, 16926824c5efSKeith Busch (dev->max_hw_sectors / (dev->page_size >> 9)) + 1); 169357dacad5SJay Sternberg } 169457dacad5SJay Sternberg if (dev->stripe_size) 169557dacad5SJay Sternberg blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9); 16961c63dc66SChristoph Hellwig if (dev->ctrl.vwc & NVME_CTRL_VWC_PRESENT) 169757dacad5SJay Sternberg blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA); 169857dacad5SJay Sternberg blk_queue_virt_boundary(ns->queue, dev->page_size - 1); 169957dacad5SJay Sternberg 170057dacad5SJay Sternberg disk->major = nvme_major; 170157dacad5SJay Sternberg disk->first_minor = 0; 170257dacad5SJay Sternberg disk->fops = &nvme_fops; 170357dacad5SJay Sternberg disk->private_data = ns; 170457dacad5SJay Sternberg disk->queue = ns->queue; 170557dacad5SJay Sternberg disk->driverfs_dev = dev->device; 170657dacad5SJay Sternberg disk->flags = GENHD_FL_EXT_DEVT; 17071c63dc66SChristoph Hellwig sprintf(disk->disk_name, "nvme%dn%d", dev->ctrl.instance, nsid); 170857dacad5SJay Sternberg 170957dacad5SJay Sternberg /* 171057dacad5SJay Sternberg * Initialize capacity to 0 until we establish the namespace format and 171157dacad5SJay Sternberg * setup integrity extentions if necessary. The revalidate_disk after 171257dacad5SJay Sternberg * add_disk allows the driver to register with integrity if the format 171357dacad5SJay Sternberg * requires it. 171457dacad5SJay Sternberg */ 171557dacad5SJay Sternberg set_capacity(disk, 0); 171657dacad5SJay Sternberg if (nvme_revalidate_disk(ns->disk)) 171757dacad5SJay Sternberg goto out_free_disk; 171857dacad5SJay Sternberg 17191673f1f0SChristoph Hellwig kref_get(&dev->ctrl.kref); 1720ca064085SMatias Bjørling if (ns->type != NVME_NS_LIGHTNVM) { 172157dacad5SJay Sternberg add_disk(ns->disk); 172257dacad5SJay Sternberg if (ns->ms) { 172357dacad5SJay Sternberg struct block_device *bd = bdget_disk(ns->disk, 0); 172457dacad5SJay Sternberg if (!bd) 172557dacad5SJay Sternberg return; 172657dacad5SJay Sternberg if (blkdev_get(bd, FMODE_READ, NULL)) { 172757dacad5SJay Sternberg bdput(bd); 172857dacad5SJay Sternberg return; 172957dacad5SJay Sternberg } 173057dacad5SJay Sternberg blkdev_reread_part(bd); 173157dacad5SJay Sternberg blkdev_put(bd, FMODE_READ); 173257dacad5SJay Sternberg } 1733ca064085SMatias Bjørling } 173457dacad5SJay Sternberg return; 173557dacad5SJay Sternberg out_free_disk: 173657dacad5SJay Sternberg kfree(disk); 173757dacad5SJay Sternberg list_del(&ns->list); 173857dacad5SJay Sternberg out_free_queue: 173957dacad5SJay Sternberg blk_cleanup_queue(ns->queue); 174057dacad5SJay Sternberg out_free_ns: 174157dacad5SJay Sternberg kfree(ns); 174257dacad5SJay Sternberg } 174357dacad5SJay Sternberg 174457dacad5SJay Sternberg /* 174557dacad5SJay Sternberg * Create I/O queues. Failing to create an I/O queue is not an issue, 174657dacad5SJay Sternberg * we can continue with less than the desired amount of queues, and 174757dacad5SJay Sternberg * even a controller without I/O queues an still be used to issue 174857dacad5SJay Sternberg * admin commands. This might be useful to upgrade a buggy firmware 174957dacad5SJay Sternberg * for example. 175057dacad5SJay Sternberg */ 175157dacad5SJay Sternberg static void nvme_create_io_queues(struct nvme_dev *dev) 175257dacad5SJay Sternberg { 175357dacad5SJay Sternberg unsigned i; 175457dacad5SJay Sternberg 175557dacad5SJay Sternberg for (i = dev->queue_count; i <= dev->max_qid; i++) 175657dacad5SJay Sternberg if (!nvme_alloc_queue(dev, i, dev->q_depth)) 175757dacad5SJay Sternberg break; 175857dacad5SJay Sternberg 175957dacad5SJay Sternberg for (i = dev->online_queues; i <= dev->queue_count - 1; i++) 176057dacad5SJay Sternberg if (nvme_create_queue(dev->queues[i], i)) { 176157dacad5SJay Sternberg nvme_free_queues(dev, i); 176257dacad5SJay Sternberg break; 176357dacad5SJay Sternberg } 176457dacad5SJay Sternberg } 176557dacad5SJay Sternberg 176657dacad5SJay Sternberg static int set_queue_count(struct nvme_dev *dev, int count) 176757dacad5SJay Sternberg { 176857dacad5SJay Sternberg int status; 176957dacad5SJay Sternberg u32 result; 177057dacad5SJay Sternberg u32 q_count = (count - 1) | ((count - 1) << 16); 177157dacad5SJay Sternberg 17721c63dc66SChristoph Hellwig status = nvme_set_features(&dev->ctrl, NVME_FEAT_NUM_QUEUES, q_count, 0, 177357dacad5SJay Sternberg &result); 177457dacad5SJay Sternberg if (status < 0) 177557dacad5SJay Sternberg return status; 177657dacad5SJay Sternberg if (status > 0) { 177757dacad5SJay Sternberg dev_err(dev->dev, "Could not set queue count (%d)\n", status); 177857dacad5SJay Sternberg return 0; 177957dacad5SJay Sternberg } 178057dacad5SJay Sternberg return min(result & 0xffff, result >> 16) + 1; 178157dacad5SJay Sternberg } 178257dacad5SJay Sternberg 178357dacad5SJay Sternberg static void __iomem *nvme_map_cmb(struct nvme_dev *dev) 178457dacad5SJay Sternberg { 178557dacad5SJay Sternberg u64 szu, size, offset; 178657dacad5SJay Sternberg u32 cmbloc; 178757dacad5SJay Sternberg resource_size_t bar_size; 178857dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 178957dacad5SJay Sternberg void __iomem *cmb; 179057dacad5SJay Sternberg dma_addr_t dma_addr; 179157dacad5SJay Sternberg 179257dacad5SJay Sternberg if (!use_cmb_sqes) 179357dacad5SJay Sternberg return NULL; 179457dacad5SJay Sternberg 17957a67cbeaSChristoph Hellwig dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); 179657dacad5SJay Sternberg if (!(NVME_CMB_SZ(dev->cmbsz))) 179757dacad5SJay Sternberg return NULL; 179857dacad5SJay Sternberg 17997a67cbeaSChristoph Hellwig cmbloc = readl(dev->bar + NVME_REG_CMBLOC); 180057dacad5SJay Sternberg 180157dacad5SJay Sternberg szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); 180257dacad5SJay Sternberg size = szu * NVME_CMB_SZ(dev->cmbsz); 180357dacad5SJay Sternberg offset = szu * NVME_CMB_OFST(cmbloc); 180457dacad5SJay Sternberg bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc)); 180557dacad5SJay Sternberg 180657dacad5SJay Sternberg if (offset > bar_size) 180757dacad5SJay Sternberg return NULL; 180857dacad5SJay Sternberg 180957dacad5SJay Sternberg /* 181057dacad5SJay Sternberg * Controllers may support a CMB size larger than their BAR, 181157dacad5SJay Sternberg * for example, due to being behind a bridge. Reduce the CMB to 181257dacad5SJay Sternberg * the reported size of the BAR 181357dacad5SJay Sternberg */ 181457dacad5SJay Sternberg if (size > bar_size - offset) 181557dacad5SJay Sternberg size = bar_size - offset; 181657dacad5SJay Sternberg 181757dacad5SJay Sternberg dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset; 181857dacad5SJay Sternberg cmb = ioremap_wc(dma_addr, size); 181957dacad5SJay Sternberg if (!cmb) 182057dacad5SJay Sternberg return NULL; 182157dacad5SJay Sternberg 182257dacad5SJay Sternberg dev->cmb_dma_addr = dma_addr; 182357dacad5SJay Sternberg dev->cmb_size = size; 182457dacad5SJay Sternberg return cmb; 182557dacad5SJay Sternberg } 182657dacad5SJay Sternberg 182757dacad5SJay Sternberg static inline void nvme_release_cmb(struct nvme_dev *dev) 182857dacad5SJay Sternberg { 182957dacad5SJay Sternberg if (dev->cmb) { 183057dacad5SJay Sternberg iounmap(dev->cmb); 183157dacad5SJay Sternberg dev->cmb = NULL; 183257dacad5SJay Sternberg } 183357dacad5SJay Sternberg } 183457dacad5SJay Sternberg 183557dacad5SJay Sternberg static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) 183657dacad5SJay Sternberg { 183757dacad5SJay Sternberg return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); 183857dacad5SJay Sternberg } 183957dacad5SJay Sternberg 184057dacad5SJay Sternberg static int nvme_setup_io_queues(struct nvme_dev *dev) 184157dacad5SJay Sternberg { 184257dacad5SJay Sternberg struct nvme_queue *adminq = dev->queues[0]; 184357dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 184457dacad5SJay Sternberg int result, i, vecs, nr_io_queues, size; 184557dacad5SJay Sternberg 184657dacad5SJay Sternberg nr_io_queues = num_possible_cpus(); 184757dacad5SJay Sternberg result = set_queue_count(dev, nr_io_queues); 184857dacad5SJay Sternberg if (result <= 0) 184957dacad5SJay Sternberg return result; 185057dacad5SJay Sternberg if (result < nr_io_queues) 185157dacad5SJay Sternberg nr_io_queues = result; 185257dacad5SJay Sternberg 185357dacad5SJay Sternberg if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { 185457dacad5SJay Sternberg result = nvme_cmb_qdepth(dev, nr_io_queues, 185557dacad5SJay Sternberg sizeof(struct nvme_command)); 185657dacad5SJay Sternberg if (result > 0) 185757dacad5SJay Sternberg dev->q_depth = result; 185857dacad5SJay Sternberg else 185957dacad5SJay Sternberg nvme_release_cmb(dev); 186057dacad5SJay Sternberg } 186157dacad5SJay Sternberg 186257dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 186357dacad5SJay Sternberg if (size > 8192) { 186457dacad5SJay Sternberg iounmap(dev->bar); 186557dacad5SJay Sternberg do { 186657dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), size); 186757dacad5SJay Sternberg if (dev->bar) 186857dacad5SJay Sternberg break; 186957dacad5SJay Sternberg if (!--nr_io_queues) 187057dacad5SJay Sternberg return -ENOMEM; 187157dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 187257dacad5SJay Sternberg } while (1); 18737a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 187457dacad5SJay Sternberg adminq->q_db = dev->dbs; 187557dacad5SJay Sternberg } 187657dacad5SJay Sternberg 187757dacad5SJay Sternberg /* Deregister the admin queue's interrupt */ 187857dacad5SJay Sternberg free_irq(dev->entry[0].vector, adminq); 187957dacad5SJay Sternberg 188057dacad5SJay Sternberg /* 188157dacad5SJay Sternberg * If we enable msix early due to not intx, disable it again before 188257dacad5SJay Sternberg * setting up the full range we need. 188357dacad5SJay Sternberg */ 188457dacad5SJay Sternberg if (!pdev->irq) 188557dacad5SJay Sternberg pci_disable_msix(pdev); 188657dacad5SJay Sternberg 188757dacad5SJay Sternberg for (i = 0; i < nr_io_queues; i++) 188857dacad5SJay Sternberg dev->entry[i].entry = i; 188957dacad5SJay Sternberg vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); 189057dacad5SJay Sternberg if (vecs < 0) { 189157dacad5SJay Sternberg vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); 189257dacad5SJay Sternberg if (vecs < 0) { 189357dacad5SJay Sternberg vecs = 1; 189457dacad5SJay Sternberg } else { 189557dacad5SJay Sternberg for (i = 0; i < vecs; i++) 189657dacad5SJay Sternberg dev->entry[i].vector = i + pdev->irq; 189757dacad5SJay Sternberg } 189857dacad5SJay Sternberg } 189957dacad5SJay Sternberg 190057dacad5SJay Sternberg /* 190157dacad5SJay Sternberg * Should investigate if there's a performance win from allocating 190257dacad5SJay Sternberg * more queues than interrupt vectors; it might allow the submission 190357dacad5SJay Sternberg * path to scale better, even if the receive path is limited by the 190457dacad5SJay Sternberg * number of interrupts. 190557dacad5SJay Sternberg */ 190657dacad5SJay Sternberg nr_io_queues = vecs; 190757dacad5SJay Sternberg dev->max_qid = nr_io_queues; 190857dacad5SJay Sternberg 190957dacad5SJay Sternberg result = queue_request_irq(dev, adminq, adminq->irqname); 191057dacad5SJay Sternberg if (result) { 191157dacad5SJay Sternberg adminq->cq_vector = -1; 191257dacad5SJay Sternberg goto free_queues; 191357dacad5SJay Sternberg } 191457dacad5SJay Sternberg 191557dacad5SJay Sternberg /* Free previously allocated queues that are no longer usable */ 191657dacad5SJay Sternberg nvme_free_queues(dev, nr_io_queues + 1); 191757dacad5SJay Sternberg nvme_create_io_queues(dev); 191857dacad5SJay Sternberg 191957dacad5SJay Sternberg return 0; 192057dacad5SJay Sternberg 192157dacad5SJay Sternberg free_queues: 192257dacad5SJay Sternberg nvme_free_queues(dev, 1); 192357dacad5SJay Sternberg return result; 192457dacad5SJay Sternberg } 192557dacad5SJay Sternberg 192657dacad5SJay Sternberg static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) 192757dacad5SJay Sternberg { 192857dacad5SJay Sternberg struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); 192957dacad5SJay Sternberg struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); 193057dacad5SJay Sternberg 193157dacad5SJay Sternberg return nsa->ns_id - nsb->ns_id; 193257dacad5SJay Sternberg } 193357dacad5SJay Sternberg 193457dacad5SJay Sternberg static struct nvme_ns *nvme_find_ns(struct nvme_dev *dev, unsigned nsid) 193557dacad5SJay Sternberg { 193657dacad5SJay Sternberg struct nvme_ns *ns; 193757dacad5SJay Sternberg 193857dacad5SJay Sternberg list_for_each_entry(ns, &dev->namespaces, list) { 193957dacad5SJay Sternberg if (ns->ns_id == nsid) 194057dacad5SJay Sternberg return ns; 194157dacad5SJay Sternberg if (ns->ns_id > nsid) 194257dacad5SJay Sternberg break; 194357dacad5SJay Sternberg } 194457dacad5SJay Sternberg return NULL; 194557dacad5SJay Sternberg } 194657dacad5SJay Sternberg 194757dacad5SJay Sternberg static inline bool nvme_io_incapable(struct nvme_dev *dev) 194857dacad5SJay Sternberg { 19497a67cbeaSChristoph Hellwig return (!dev->bar || 19507a67cbeaSChristoph Hellwig readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_CFS || 195157dacad5SJay Sternberg dev->online_queues < 2); 195257dacad5SJay Sternberg } 195357dacad5SJay Sternberg 195457dacad5SJay Sternberg static void nvme_ns_remove(struct nvme_ns *ns) 195557dacad5SJay Sternberg { 19561c63dc66SChristoph Hellwig bool kill = nvme_io_incapable(to_nvme_dev(ns->ctrl)) && 19571c63dc66SChristoph Hellwig !blk_queue_dying(ns->queue); 195857dacad5SJay Sternberg 195957dacad5SJay Sternberg if (kill) 196057dacad5SJay Sternberg blk_set_queue_dying(ns->queue); 19619609b994SDan Williams if (ns->disk->flags & GENHD_FL_UP) 196257dacad5SJay Sternberg del_gendisk(ns->disk); 196357dacad5SJay Sternberg if (kill || !blk_queue_dying(ns->queue)) { 196457dacad5SJay Sternberg blk_mq_abort_requeue_list(ns->queue); 196557dacad5SJay Sternberg blk_cleanup_queue(ns->queue); 196657dacad5SJay Sternberg } 196757dacad5SJay Sternberg list_del_init(&ns->list); 19681673f1f0SChristoph Hellwig nvme_put_ns(ns); 196957dacad5SJay Sternberg } 197057dacad5SJay Sternberg 197157dacad5SJay Sternberg static void nvme_scan_namespaces(struct nvme_dev *dev, unsigned nn) 197257dacad5SJay Sternberg { 197357dacad5SJay Sternberg struct nvme_ns *ns, *next; 197457dacad5SJay Sternberg unsigned i; 197557dacad5SJay Sternberg 197657dacad5SJay Sternberg for (i = 1; i <= nn; i++) { 197757dacad5SJay Sternberg ns = nvme_find_ns(dev, i); 197857dacad5SJay Sternberg if (ns) { 197957dacad5SJay Sternberg if (revalidate_disk(ns->disk)) 198057dacad5SJay Sternberg nvme_ns_remove(ns); 198157dacad5SJay Sternberg } else 198257dacad5SJay Sternberg nvme_alloc_ns(dev, i); 198357dacad5SJay Sternberg } 198457dacad5SJay Sternberg list_for_each_entry_safe(ns, next, &dev->namespaces, list) { 198557dacad5SJay Sternberg if (ns->ns_id > nn) 198657dacad5SJay Sternberg nvme_ns_remove(ns); 198757dacad5SJay Sternberg } 198857dacad5SJay Sternberg list_sort(NULL, &dev->namespaces, ns_cmp); 198957dacad5SJay Sternberg } 199057dacad5SJay Sternberg 199157dacad5SJay Sternberg static void nvme_set_irq_hints(struct nvme_dev *dev) 199257dacad5SJay Sternberg { 199357dacad5SJay Sternberg struct nvme_queue *nvmeq; 199457dacad5SJay Sternberg int i; 199557dacad5SJay Sternberg 199657dacad5SJay Sternberg for (i = 0; i < dev->online_queues; i++) { 199757dacad5SJay Sternberg nvmeq = dev->queues[i]; 199857dacad5SJay Sternberg 199957dacad5SJay Sternberg if (!nvmeq->tags || !(*nvmeq->tags)) 200057dacad5SJay Sternberg continue; 200157dacad5SJay Sternberg 200257dacad5SJay Sternberg irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, 200357dacad5SJay Sternberg blk_mq_tags_cpumask(*nvmeq->tags)); 200457dacad5SJay Sternberg } 200557dacad5SJay Sternberg } 200657dacad5SJay Sternberg 200757dacad5SJay Sternberg static void nvme_dev_scan(struct work_struct *work) 200857dacad5SJay Sternberg { 200957dacad5SJay Sternberg struct nvme_dev *dev = container_of(work, struct nvme_dev, scan_work); 201057dacad5SJay Sternberg struct nvme_id_ctrl *ctrl; 201157dacad5SJay Sternberg 201257dacad5SJay Sternberg if (!dev->tagset.tags) 201357dacad5SJay Sternberg return; 20141c63dc66SChristoph Hellwig if (nvme_identify_ctrl(&dev->ctrl, &ctrl)) 201557dacad5SJay Sternberg return; 201657dacad5SJay Sternberg nvme_scan_namespaces(dev, le32_to_cpup(&ctrl->nn)); 201757dacad5SJay Sternberg kfree(ctrl); 201857dacad5SJay Sternberg nvme_set_irq_hints(dev); 201957dacad5SJay Sternberg } 202057dacad5SJay Sternberg 202157dacad5SJay Sternberg /* 202257dacad5SJay Sternberg * Return: error value if an error occurred setting up the queues or calling 202357dacad5SJay Sternberg * Identify Device. 0 if these succeeded, even if adding some of the 202457dacad5SJay Sternberg * namespaces failed. At the moment, these failures are silent. TBD which 202557dacad5SJay Sternberg * failures should be reported. 202657dacad5SJay Sternberg */ 202757dacad5SJay Sternberg static int nvme_dev_add(struct nvme_dev *dev) 202857dacad5SJay Sternberg { 202957dacad5SJay Sternberg int res; 203057dacad5SJay Sternberg struct nvme_id_ctrl *ctrl; 20317a67cbeaSChristoph Hellwig int shift = NVME_CAP_MPSMIN(lo_hi_readq(dev->bar + NVME_REG_CAP)) + 12; 203257dacad5SJay Sternberg 20331c63dc66SChristoph Hellwig res = nvme_identify_ctrl(&dev->ctrl, &ctrl); 203457dacad5SJay Sternberg if (res) { 203557dacad5SJay Sternberg dev_err(dev->dev, "Identify Controller failed (%d)\n", res); 203657dacad5SJay Sternberg return -EIO; 203757dacad5SJay Sternberg } 203857dacad5SJay Sternberg 20391c63dc66SChristoph Hellwig dev->ctrl.oncs = le16_to_cpup(&ctrl->oncs); 20401c63dc66SChristoph Hellwig dev->ctrl.abort_limit = ctrl->acl + 1; 20411c63dc66SChristoph Hellwig dev->ctrl.vwc = ctrl->vwc; 20421c63dc66SChristoph Hellwig memcpy(dev->ctrl.serial, ctrl->sn, sizeof(ctrl->sn)); 20431c63dc66SChristoph Hellwig memcpy(dev->ctrl.model, ctrl->mn, sizeof(ctrl->mn)); 20441c63dc66SChristoph Hellwig memcpy(dev->ctrl.firmware_rev, ctrl->fr, sizeof(ctrl->fr)); 204557dacad5SJay Sternberg if (ctrl->mdts) 204657dacad5SJay Sternberg dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9); 2047b12363d0SSathyavathi M else 2048b12363d0SSathyavathi M dev->max_hw_sectors = UINT_MAX; 2049106198edSChristoph Hellwig 2050106198edSChristoph Hellwig if ((dev->ctrl.quirks & NVME_QUIRK_STRIPE_SIZE) && ctrl->vs[3]) { 205157dacad5SJay Sternberg unsigned int max_hw_sectors; 205257dacad5SJay Sternberg 205357dacad5SJay Sternberg dev->stripe_size = 1 << (ctrl->vs[3] + shift); 205457dacad5SJay Sternberg max_hw_sectors = dev->stripe_size >> (shift - 9); 205557dacad5SJay Sternberg if (dev->max_hw_sectors) { 205657dacad5SJay Sternberg dev->max_hw_sectors = min(max_hw_sectors, 205757dacad5SJay Sternberg dev->max_hw_sectors); 205857dacad5SJay Sternberg } else 205957dacad5SJay Sternberg dev->max_hw_sectors = max_hw_sectors; 206057dacad5SJay Sternberg } 206157dacad5SJay Sternberg kfree(ctrl); 206257dacad5SJay Sternberg 206357dacad5SJay Sternberg if (!dev->tagset.tags) { 206457dacad5SJay Sternberg dev->tagset.ops = &nvme_mq_ops; 206557dacad5SJay Sternberg dev->tagset.nr_hw_queues = dev->online_queues - 1; 206657dacad5SJay Sternberg dev->tagset.timeout = NVME_IO_TIMEOUT; 206757dacad5SJay Sternberg dev->tagset.numa_node = dev_to_node(dev->dev); 206857dacad5SJay Sternberg dev->tagset.queue_depth = 206957dacad5SJay Sternberg min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; 207057dacad5SJay Sternberg dev->tagset.cmd_size = nvme_cmd_size(dev); 207157dacad5SJay Sternberg dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; 207257dacad5SJay Sternberg dev->tagset.driver_data = dev; 207357dacad5SJay Sternberg 207457dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->tagset)) 207557dacad5SJay Sternberg return 0; 207657dacad5SJay Sternberg } 207757dacad5SJay Sternberg schedule_work(&dev->scan_work); 207857dacad5SJay Sternberg return 0; 207957dacad5SJay Sternberg } 208057dacad5SJay Sternberg 208157dacad5SJay Sternberg static int nvme_dev_map(struct nvme_dev *dev) 208257dacad5SJay Sternberg { 208357dacad5SJay Sternberg u64 cap; 208457dacad5SJay Sternberg int bars, result = -ENOMEM; 208557dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 208657dacad5SJay Sternberg 208757dacad5SJay Sternberg if (pci_enable_device_mem(pdev)) 208857dacad5SJay Sternberg return result; 208957dacad5SJay Sternberg 209057dacad5SJay Sternberg dev->entry[0].vector = pdev->irq; 209157dacad5SJay Sternberg pci_set_master(pdev); 209257dacad5SJay Sternberg bars = pci_select_bars(pdev, IORESOURCE_MEM); 209357dacad5SJay Sternberg if (!bars) 209457dacad5SJay Sternberg goto disable_pci; 209557dacad5SJay Sternberg 209657dacad5SJay Sternberg if (pci_request_selected_regions(pdev, bars, "nvme")) 209757dacad5SJay Sternberg goto disable_pci; 209857dacad5SJay Sternberg 209957dacad5SJay Sternberg if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && 210057dacad5SJay Sternberg dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) 210157dacad5SJay Sternberg goto disable; 210257dacad5SJay Sternberg 210357dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); 210457dacad5SJay Sternberg if (!dev->bar) 210557dacad5SJay Sternberg goto disable; 210657dacad5SJay Sternberg 21077a67cbeaSChristoph Hellwig if (readl(dev->bar + NVME_REG_CSTS) == -1) { 210857dacad5SJay Sternberg result = -ENODEV; 210957dacad5SJay Sternberg goto unmap; 211057dacad5SJay Sternberg } 211157dacad5SJay Sternberg 211257dacad5SJay Sternberg /* 211357dacad5SJay Sternberg * Some devices don't advertse INTx interrupts, pre-enable a single 211457dacad5SJay Sternberg * MSIX vec for setup. We'll adjust this later. 211557dacad5SJay Sternberg */ 211657dacad5SJay Sternberg if (!pdev->irq) { 211757dacad5SJay Sternberg result = pci_enable_msix(pdev, dev->entry, 1); 211857dacad5SJay Sternberg if (result < 0) 211957dacad5SJay Sternberg goto unmap; 212057dacad5SJay Sternberg } 212157dacad5SJay Sternberg 21227a67cbeaSChristoph Hellwig cap = lo_hi_readq(dev->bar + NVME_REG_CAP); 21237a67cbeaSChristoph Hellwig 212457dacad5SJay Sternberg dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); 212557dacad5SJay Sternberg dev->db_stride = 1 << NVME_CAP_STRIDE(cap); 21267a67cbeaSChristoph Hellwig dev->dbs = dev->bar + 4096; 21277a67cbeaSChristoph Hellwig if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2)) 212857dacad5SJay Sternberg dev->cmb = nvme_map_cmb(dev); 212957dacad5SJay Sternberg 213057dacad5SJay Sternberg return 0; 213157dacad5SJay Sternberg 213257dacad5SJay Sternberg unmap: 213357dacad5SJay Sternberg iounmap(dev->bar); 213457dacad5SJay Sternberg dev->bar = NULL; 213557dacad5SJay Sternberg disable: 213657dacad5SJay Sternberg pci_release_regions(pdev); 213757dacad5SJay Sternberg disable_pci: 213857dacad5SJay Sternberg pci_disable_device(pdev); 213957dacad5SJay Sternberg return result; 214057dacad5SJay Sternberg } 214157dacad5SJay Sternberg 214257dacad5SJay Sternberg static void nvme_dev_unmap(struct nvme_dev *dev) 214357dacad5SJay Sternberg { 214457dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 214557dacad5SJay Sternberg 214657dacad5SJay Sternberg if (pdev->msi_enabled) 214757dacad5SJay Sternberg pci_disable_msi(pdev); 214857dacad5SJay Sternberg else if (pdev->msix_enabled) 214957dacad5SJay Sternberg pci_disable_msix(pdev); 215057dacad5SJay Sternberg 215157dacad5SJay Sternberg if (dev->bar) { 215257dacad5SJay Sternberg iounmap(dev->bar); 215357dacad5SJay Sternberg dev->bar = NULL; 215457dacad5SJay Sternberg pci_release_regions(pdev); 215557dacad5SJay Sternberg } 215657dacad5SJay Sternberg 215757dacad5SJay Sternberg if (pci_is_enabled(pdev)) 215857dacad5SJay Sternberg pci_disable_device(pdev); 215957dacad5SJay Sternberg } 216057dacad5SJay Sternberg 216157dacad5SJay Sternberg struct nvme_delq_ctx { 216257dacad5SJay Sternberg struct task_struct *waiter; 216357dacad5SJay Sternberg struct kthread_worker *worker; 216457dacad5SJay Sternberg atomic_t refcount; 216557dacad5SJay Sternberg }; 216657dacad5SJay Sternberg 216757dacad5SJay Sternberg static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev) 216857dacad5SJay Sternberg { 216957dacad5SJay Sternberg dq->waiter = current; 217057dacad5SJay Sternberg mb(); 217157dacad5SJay Sternberg 217257dacad5SJay Sternberg for (;;) { 217357dacad5SJay Sternberg set_current_state(TASK_KILLABLE); 217457dacad5SJay Sternberg if (!atomic_read(&dq->refcount)) 217557dacad5SJay Sternberg break; 217657dacad5SJay Sternberg if (!schedule_timeout(ADMIN_TIMEOUT) || 217757dacad5SJay Sternberg fatal_signal_pending(current)) { 217857dacad5SJay Sternberg /* 217957dacad5SJay Sternberg * Disable the controller first since we can't trust it 218057dacad5SJay Sternberg * at this point, but leave the admin queue enabled 218157dacad5SJay Sternberg * until all queue deletion requests are flushed. 218257dacad5SJay Sternberg * FIXME: This may take a while if there are more h/w 218357dacad5SJay Sternberg * queues than admin tags. 218457dacad5SJay Sternberg */ 218557dacad5SJay Sternberg set_current_state(TASK_RUNNING); 21867a67cbeaSChristoph Hellwig nvme_disable_ctrl(dev, 21877a67cbeaSChristoph Hellwig lo_hi_readq(dev->bar + NVME_REG_CAP)); 218857dacad5SJay Sternberg nvme_clear_queue(dev->queues[0]); 218957dacad5SJay Sternberg flush_kthread_worker(dq->worker); 219057dacad5SJay Sternberg nvme_disable_queue(dev, 0); 219157dacad5SJay Sternberg return; 219257dacad5SJay Sternberg } 219357dacad5SJay Sternberg } 219457dacad5SJay Sternberg set_current_state(TASK_RUNNING); 219557dacad5SJay Sternberg } 219657dacad5SJay Sternberg 219757dacad5SJay Sternberg static void nvme_put_dq(struct nvme_delq_ctx *dq) 219857dacad5SJay Sternberg { 219957dacad5SJay Sternberg atomic_dec(&dq->refcount); 220057dacad5SJay Sternberg if (dq->waiter) 220157dacad5SJay Sternberg wake_up_process(dq->waiter); 220257dacad5SJay Sternberg } 220357dacad5SJay Sternberg 220457dacad5SJay Sternberg static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq) 220557dacad5SJay Sternberg { 220657dacad5SJay Sternberg atomic_inc(&dq->refcount); 220757dacad5SJay Sternberg return dq; 220857dacad5SJay Sternberg } 220957dacad5SJay Sternberg 221057dacad5SJay Sternberg static void nvme_del_queue_end(struct nvme_queue *nvmeq) 221157dacad5SJay Sternberg { 221257dacad5SJay Sternberg struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx; 221357dacad5SJay Sternberg nvme_put_dq(dq); 2214604e8c8dSKeith Busch 2215604e8c8dSKeith Busch spin_lock_irq(&nvmeq->q_lock); 2216604e8c8dSKeith Busch nvme_process_cq(nvmeq); 2217604e8c8dSKeith Busch spin_unlock_irq(&nvmeq->q_lock); 221857dacad5SJay Sternberg } 221957dacad5SJay Sternberg 222057dacad5SJay Sternberg static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode, 222157dacad5SJay Sternberg kthread_work_func_t fn) 222257dacad5SJay Sternberg { 222357dacad5SJay Sternberg struct nvme_command c; 222457dacad5SJay Sternberg 222557dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 222657dacad5SJay Sternberg c.delete_queue.opcode = opcode; 222757dacad5SJay Sternberg c.delete_queue.qid = cpu_to_le16(nvmeq->qid); 222857dacad5SJay Sternberg 222957dacad5SJay Sternberg init_kthread_work(&nvmeq->cmdinfo.work, fn); 223057dacad5SJay Sternberg return nvme_submit_admin_async_cmd(nvmeq->dev, &c, &nvmeq->cmdinfo, 223157dacad5SJay Sternberg ADMIN_TIMEOUT); 223257dacad5SJay Sternberg } 223357dacad5SJay Sternberg 223457dacad5SJay Sternberg static void nvme_del_cq_work_handler(struct kthread_work *work) 223557dacad5SJay Sternberg { 223657dacad5SJay Sternberg struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, 223757dacad5SJay Sternberg cmdinfo.work); 223857dacad5SJay Sternberg nvme_del_queue_end(nvmeq); 223957dacad5SJay Sternberg } 224057dacad5SJay Sternberg 224157dacad5SJay Sternberg static int nvme_delete_cq(struct nvme_queue *nvmeq) 224257dacad5SJay Sternberg { 224357dacad5SJay Sternberg return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq, 224457dacad5SJay Sternberg nvme_del_cq_work_handler); 224557dacad5SJay Sternberg } 224657dacad5SJay Sternberg 224757dacad5SJay Sternberg static void nvme_del_sq_work_handler(struct kthread_work *work) 224857dacad5SJay Sternberg { 224957dacad5SJay Sternberg struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, 225057dacad5SJay Sternberg cmdinfo.work); 225157dacad5SJay Sternberg int status = nvmeq->cmdinfo.status; 225257dacad5SJay Sternberg 225357dacad5SJay Sternberg if (!status) 225457dacad5SJay Sternberg status = nvme_delete_cq(nvmeq); 225557dacad5SJay Sternberg if (status) 225657dacad5SJay Sternberg nvme_del_queue_end(nvmeq); 225757dacad5SJay Sternberg } 225857dacad5SJay Sternberg 225957dacad5SJay Sternberg static int nvme_delete_sq(struct nvme_queue *nvmeq) 226057dacad5SJay Sternberg { 226157dacad5SJay Sternberg return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq, 226257dacad5SJay Sternberg nvme_del_sq_work_handler); 226357dacad5SJay Sternberg } 226457dacad5SJay Sternberg 226557dacad5SJay Sternberg static void nvme_del_queue_start(struct kthread_work *work) 226657dacad5SJay Sternberg { 226757dacad5SJay Sternberg struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, 226857dacad5SJay Sternberg cmdinfo.work); 226957dacad5SJay Sternberg if (nvme_delete_sq(nvmeq)) 227057dacad5SJay Sternberg nvme_del_queue_end(nvmeq); 227157dacad5SJay Sternberg } 227257dacad5SJay Sternberg 227357dacad5SJay Sternberg static void nvme_disable_io_queues(struct nvme_dev *dev) 227457dacad5SJay Sternberg { 227557dacad5SJay Sternberg int i; 227657dacad5SJay Sternberg DEFINE_KTHREAD_WORKER_ONSTACK(worker); 227757dacad5SJay Sternberg struct nvme_delq_ctx dq; 227857dacad5SJay Sternberg struct task_struct *kworker_task = kthread_run(kthread_worker_fn, 22791c63dc66SChristoph Hellwig &worker, "nvme%d", dev->ctrl.instance); 228057dacad5SJay Sternberg 228157dacad5SJay Sternberg if (IS_ERR(kworker_task)) { 228257dacad5SJay Sternberg dev_err(dev->dev, 228357dacad5SJay Sternberg "Failed to create queue del task\n"); 228457dacad5SJay Sternberg for (i = dev->queue_count - 1; i > 0; i--) 228557dacad5SJay Sternberg nvme_disable_queue(dev, i); 228657dacad5SJay Sternberg return; 228757dacad5SJay Sternberg } 228857dacad5SJay Sternberg 228957dacad5SJay Sternberg dq.waiter = NULL; 229057dacad5SJay Sternberg atomic_set(&dq.refcount, 0); 229157dacad5SJay Sternberg dq.worker = &worker; 229257dacad5SJay Sternberg for (i = dev->queue_count - 1; i > 0; i--) { 229357dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 229457dacad5SJay Sternberg 229557dacad5SJay Sternberg if (nvme_suspend_queue(nvmeq)) 229657dacad5SJay Sternberg continue; 229757dacad5SJay Sternberg nvmeq->cmdinfo.ctx = nvme_get_dq(&dq); 229857dacad5SJay Sternberg nvmeq->cmdinfo.worker = dq.worker; 229957dacad5SJay Sternberg init_kthread_work(&nvmeq->cmdinfo.work, nvme_del_queue_start); 230057dacad5SJay Sternberg queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work); 230157dacad5SJay Sternberg } 230257dacad5SJay Sternberg nvme_wait_dq(&dq, dev); 230357dacad5SJay Sternberg kthread_stop(kworker_task); 230457dacad5SJay Sternberg } 230557dacad5SJay Sternberg 230657dacad5SJay Sternberg /* 230757dacad5SJay Sternberg * Remove the node from the device list and check 230857dacad5SJay Sternberg * for whether or not we need to stop the nvme_thread. 230957dacad5SJay Sternberg */ 231057dacad5SJay Sternberg static void nvme_dev_list_remove(struct nvme_dev *dev) 231157dacad5SJay Sternberg { 231257dacad5SJay Sternberg struct task_struct *tmp = NULL; 231357dacad5SJay Sternberg 231457dacad5SJay Sternberg spin_lock(&dev_list_lock); 231557dacad5SJay Sternberg list_del_init(&dev->node); 231657dacad5SJay Sternberg if (list_empty(&dev_list) && !IS_ERR_OR_NULL(nvme_thread)) { 231757dacad5SJay Sternberg tmp = nvme_thread; 231857dacad5SJay Sternberg nvme_thread = NULL; 231957dacad5SJay Sternberg } 232057dacad5SJay Sternberg spin_unlock(&dev_list_lock); 232157dacad5SJay Sternberg 232257dacad5SJay Sternberg if (tmp) 232357dacad5SJay Sternberg kthread_stop(tmp); 232457dacad5SJay Sternberg } 232557dacad5SJay Sternberg 232657dacad5SJay Sternberg static void nvme_freeze_queues(struct nvme_dev *dev) 232757dacad5SJay Sternberg { 232857dacad5SJay Sternberg struct nvme_ns *ns; 232957dacad5SJay Sternberg 233057dacad5SJay Sternberg list_for_each_entry(ns, &dev->namespaces, list) { 233157dacad5SJay Sternberg blk_mq_freeze_queue_start(ns->queue); 233257dacad5SJay Sternberg 233357dacad5SJay Sternberg spin_lock_irq(ns->queue->queue_lock); 233457dacad5SJay Sternberg queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); 233557dacad5SJay Sternberg spin_unlock_irq(ns->queue->queue_lock); 233657dacad5SJay Sternberg 233757dacad5SJay Sternberg blk_mq_cancel_requeue_work(ns->queue); 233857dacad5SJay Sternberg blk_mq_stop_hw_queues(ns->queue); 233957dacad5SJay Sternberg } 234057dacad5SJay Sternberg } 234157dacad5SJay Sternberg 234257dacad5SJay Sternberg static void nvme_unfreeze_queues(struct nvme_dev *dev) 234357dacad5SJay Sternberg { 234457dacad5SJay Sternberg struct nvme_ns *ns; 234557dacad5SJay Sternberg 234657dacad5SJay Sternberg list_for_each_entry(ns, &dev->namespaces, list) { 234757dacad5SJay Sternberg queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); 234857dacad5SJay Sternberg blk_mq_unfreeze_queue(ns->queue); 234957dacad5SJay Sternberg blk_mq_start_stopped_hw_queues(ns->queue, true); 235057dacad5SJay Sternberg blk_mq_kick_requeue_list(ns->queue); 235157dacad5SJay Sternberg } 235257dacad5SJay Sternberg } 235357dacad5SJay Sternberg 235457dacad5SJay Sternberg static void nvme_dev_shutdown(struct nvme_dev *dev) 235557dacad5SJay Sternberg { 235657dacad5SJay Sternberg int i; 235757dacad5SJay Sternberg u32 csts = -1; 235857dacad5SJay Sternberg 235957dacad5SJay Sternberg nvme_dev_list_remove(dev); 236057dacad5SJay Sternberg 236157dacad5SJay Sternberg if (dev->bar) { 236257dacad5SJay Sternberg nvme_freeze_queues(dev); 23637a67cbeaSChristoph Hellwig csts = readl(dev->bar + NVME_REG_CSTS); 236457dacad5SJay Sternberg } 236557dacad5SJay Sternberg if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) { 236657dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= 0; i--) { 236757dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 236857dacad5SJay Sternberg nvme_suspend_queue(nvmeq); 236957dacad5SJay Sternberg } 237057dacad5SJay Sternberg } else { 237157dacad5SJay Sternberg nvme_disable_io_queues(dev); 237257dacad5SJay Sternberg nvme_shutdown_ctrl(dev); 237357dacad5SJay Sternberg nvme_disable_queue(dev, 0); 237457dacad5SJay Sternberg } 237557dacad5SJay Sternberg nvme_dev_unmap(dev); 237657dacad5SJay Sternberg 237757dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= 0; i--) 237857dacad5SJay Sternberg nvme_clear_queue(dev->queues[i]); 237957dacad5SJay Sternberg } 238057dacad5SJay Sternberg 238157dacad5SJay Sternberg static void nvme_dev_remove(struct nvme_dev *dev) 238257dacad5SJay Sternberg { 238357dacad5SJay Sternberg struct nvme_ns *ns, *next; 238457dacad5SJay Sternberg 238557dacad5SJay Sternberg list_for_each_entry_safe(ns, next, &dev->namespaces, list) 238657dacad5SJay Sternberg nvme_ns_remove(ns); 238757dacad5SJay Sternberg } 238857dacad5SJay Sternberg 238957dacad5SJay Sternberg static int nvme_setup_prp_pools(struct nvme_dev *dev) 239057dacad5SJay Sternberg { 239157dacad5SJay Sternberg dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, 239257dacad5SJay Sternberg PAGE_SIZE, PAGE_SIZE, 0); 239357dacad5SJay Sternberg if (!dev->prp_page_pool) 239457dacad5SJay Sternberg return -ENOMEM; 239557dacad5SJay Sternberg 239657dacad5SJay Sternberg /* Optimisation for I/Os between 4k and 128k */ 239757dacad5SJay Sternberg dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, 239857dacad5SJay Sternberg 256, 256, 0); 239957dacad5SJay Sternberg if (!dev->prp_small_pool) { 240057dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 240157dacad5SJay Sternberg return -ENOMEM; 240257dacad5SJay Sternberg } 240357dacad5SJay Sternberg return 0; 240457dacad5SJay Sternberg } 240557dacad5SJay Sternberg 240657dacad5SJay Sternberg static void nvme_release_prp_pools(struct nvme_dev *dev) 240757dacad5SJay Sternberg { 240857dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 240957dacad5SJay Sternberg dma_pool_destroy(dev->prp_small_pool); 241057dacad5SJay Sternberg } 241157dacad5SJay Sternberg 241257dacad5SJay Sternberg static DEFINE_IDA(nvme_instance_ida); 241357dacad5SJay Sternberg 241457dacad5SJay Sternberg static int nvme_set_instance(struct nvme_dev *dev) 241557dacad5SJay Sternberg { 241657dacad5SJay Sternberg int instance, error; 241757dacad5SJay Sternberg 241857dacad5SJay Sternberg do { 241957dacad5SJay Sternberg if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) 242057dacad5SJay Sternberg return -ENODEV; 242157dacad5SJay Sternberg 242257dacad5SJay Sternberg spin_lock(&dev_list_lock); 242357dacad5SJay Sternberg error = ida_get_new(&nvme_instance_ida, &instance); 242457dacad5SJay Sternberg spin_unlock(&dev_list_lock); 242557dacad5SJay Sternberg } while (error == -EAGAIN); 242657dacad5SJay Sternberg 242757dacad5SJay Sternberg if (error) 242857dacad5SJay Sternberg return -ENODEV; 242957dacad5SJay Sternberg 24301c63dc66SChristoph Hellwig dev->ctrl.instance = instance; 243157dacad5SJay Sternberg return 0; 243257dacad5SJay Sternberg } 243357dacad5SJay Sternberg 243457dacad5SJay Sternberg static void nvme_release_instance(struct nvme_dev *dev) 243557dacad5SJay Sternberg { 243657dacad5SJay Sternberg spin_lock(&dev_list_lock); 24371c63dc66SChristoph Hellwig ida_remove(&nvme_instance_ida, dev->ctrl.instance); 243857dacad5SJay Sternberg spin_unlock(&dev_list_lock); 243957dacad5SJay Sternberg } 244057dacad5SJay Sternberg 24411673f1f0SChristoph Hellwig static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) 244257dacad5SJay Sternberg { 24431673f1f0SChristoph Hellwig struct nvme_dev *dev = to_nvme_dev(ctrl); 244457dacad5SJay Sternberg 244557dacad5SJay Sternberg put_device(dev->dev); 244657dacad5SJay Sternberg put_device(dev->device); 244757dacad5SJay Sternberg nvme_release_instance(dev); 244857dacad5SJay Sternberg if (dev->tagset.tags) 244957dacad5SJay Sternberg blk_mq_free_tag_set(&dev->tagset); 24501c63dc66SChristoph Hellwig if (dev->ctrl.admin_q) 24511c63dc66SChristoph Hellwig blk_put_queue(dev->ctrl.admin_q); 245257dacad5SJay Sternberg kfree(dev->queues); 245357dacad5SJay Sternberg kfree(dev->entry); 245457dacad5SJay Sternberg kfree(dev); 245557dacad5SJay Sternberg } 245657dacad5SJay Sternberg 245757dacad5SJay Sternberg static int nvme_dev_open(struct inode *inode, struct file *f) 245857dacad5SJay Sternberg { 245957dacad5SJay Sternberg struct nvme_dev *dev; 246057dacad5SJay Sternberg int instance = iminor(inode); 246157dacad5SJay Sternberg int ret = -ENODEV; 246257dacad5SJay Sternberg 246357dacad5SJay Sternberg spin_lock(&dev_list_lock); 246457dacad5SJay Sternberg list_for_each_entry(dev, &dev_list, node) { 24651c63dc66SChristoph Hellwig if (dev->ctrl.instance == instance) { 24661c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q) { 246757dacad5SJay Sternberg ret = -EWOULDBLOCK; 246857dacad5SJay Sternberg break; 246957dacad5SJay Sternberg } 24701673f1f0SChristoph Hellwig if (!kref_get_unless_zero(&dev->ctrl.kref)) 247157dacad5SJay Sternberg break; 247257dacad5SJay Sternberg f->private_data = dev; 247357dacad5SJay Sternberg ret = 0; 247457dacad5SJay Sternberg break; 247557dacad5SJay Sternberg } 247657dacad5SJay Sternberg } 247757dacad5SJay Sternberg spin_unlock(&dev_list_lock); 247857dacad5SJay Sternberg 247957dacad5SJay Sternberg return ret; 248057dacad5SJay Sternberg } 248157dacad5SJay Sternberg 248257dacad5SJay Sternberg static int nvme_dev_release(struct inode *inode, struct file *f) 248357dacad5SJay Sternberg { 248457dacad5SJay Sternberg struct nvme_dev *dev = f->private_data; 24851673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 248657dacad5SJay Sternberg return 0; 248757dacad5SJay Sternberg } 248857dacad5SJay Sternberg 248957dacad5SJay Sternberg static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg) 249057dacad5SJay Sternberg { 249157dacad5SJay Sternberg struct nvme_dev *dev = f->private_data; 249257dacad5SJay Sternberg struct nvme_ns *ns; 249357dacad5SJay Sternberg 249457dacad5SJay Sternberg switch (cmd) { 249557dacad5SJay Sternberg case NVME_IOCTL_ADMIN_CMD: 24961c63dc66SChristoph Hellwig return nvme_user_cmd(&dev->ctrl, NULL, (void __user *)arg); 249757dacad5SJay Sternberg case NVME_IOCTL_IO_CMD: 249857dacad5SJay Sternberg if (list_empty(&dev->namespaces)) 249957dacad5SJay Sternberg return -ENOTTY; 250057dacad5SJay Sternberg ns = list_first_entry(&dev->namespaces, struct nvme_ns, list); 25011c63dc66SChristoph Hellwig return nvme_user_cmd(&dev->ctrl, ns, (void __user *)arg); 250257dacad5SJay Sternberg case NVME_IOCTL_RESET: 250357dacad5SJay Sternberg dev_warn(dev->dev, "resetting controller\n"); 250457dacad5SJay Sternberg return nvme_reset(dev); 250557dacad5SJay Sternberg case NVME_IOCTL_SUBSYS_RESET: 250657dacad5SJay Sternberg return nvme_subsys_reset(dev); 250757dacad5SJay Sternberg default: 250857dacad5SJay Sternberg return -ENOTTY; 250957dacad5SJay Sternberg } 251057dacad5SJay Sternberg } 251157dacad5SJay Sternberg 251257dacad5SJay Sternberg static const struct file_operations nvme_dev_fops = { 251357dacad5SJay Sternberg .owner = THIS_MODULE, 251457dacad5SJay Sternberg .open = nvme_dev_open, 251557dacad5SJay Sternberg .release = nvme_dev_release, 251657dacad5SJay Sternberg .unlocked_ioctl = nvme_dev_ioctl, 251757dacad5SJay Sternberg .compat_ioctl = nvme_dev_ioctl, 251857dacad5SJay Sternberg }; 251957dacad5SJay Sternberg 252057dacad5SJay Sternberg static void nvme_probe_work(struct work_struct *work) 252157dacad5SJay Sternberg { 252257dacad5SJay Sternberg struct nvme_dev *dev = container_of(work, struct nvme_dev, probe_work); 252357dacad5SJay Sternberg bool start_thread = false; 252457dacad5SJay Sternberg int result; 252557dacad5SJay Sternberg 252657dacad5SJay Sternberg result = nvme_dev_map(dev); 252757dacad5SJay Sternberg if (result) 252857dacad5SJay Sternberg goto out; 252957dacad5SJay Sternberg 253057dacad5SJay Sternberg result = nvme_configure_admin_queue(dev); 253157dacad5SJay Sternberg if (result) 253257dacad5SJay Sternberg goto unmap; 253357dacad5SJay Sternberg 253457dacad5SJay Sternberg spin_lock(&dev_list_lock); 253557dacad5SJay Sternberg if (list_empty(&dev_list) && IS_ERR_OR_NULL(nvme_thread)) { 253657dacad5SJay Sternberg start_thread = true; 253757dacad5SJay Sternberg nvme_thread = NULL; 253857dacad5SJay Sternberg } 253957dacad5SJay Sternberg list_add(&dev->node, &dev_list); 254057dacad5SJay Sternberg spin_unlock(&dev_list_lock); 254157dacad5SJay Sternberg 254257dacad5SJay Sternberg if (start_thread) { 254357dacad5SJay Sternberg nvme_thread = kthread_run(nvme_kthread, NULL, "nvme"); 254457dacad5SJay Sternberg wake_up_all(&nvme_kthread_wait); 254557dacad5SJay Sternberg } else 254657dacad5SJay Sternberg wait_event_killable(nvme_kthread_wait, nvme_thread); 254757dacad5SJay Sternberg 254857dacad5SJay Sternberg if (IS_ERR_OR_NULL(nvme_thread)) { 254957dacad5SJay Sternberg result = nvme_thread ? PTR_ERR(nvme_thread) : -EINTR; 255057dacad5SJay Sternberg goto disable; 255157dacad5SJay Sternberg } 255257dacad5SJay Sternberg 255357dacad5SJay Sternberg nvme_init_queue(dev->queues[0], 0); 255457dacad5SJay Sternberg result = nvme_alloc_admin_tags(dev); 255557dacad5SJay Sternberg if (result) 255657dacad5SJay Sternberg goto disable; 255757dacad5SJay Sternberg 255857dacad5SJay Sternberg result = nvme_setup_io_queues(dev); 255957dacad5SJay Sternberg if (result) 256057dacad5SJay Sternberg goto free_tags; 256157dacad5SJay Sternberg 25621c63dc66SChristoph Hellwig dev->ctrl.event_limit = 1; 256357dacad5SJay Sternberg 256457dacad5SJay Sternberg /* 256557dacad5SJay Sternberg * Keep the controller around but remove all namespaces if we don't have 256657dacad5SJay Sternberg * any working I/O queue. 256757dacad5SJay Sternberg */ 256857dacad5SJay Sternberg if (dev->online_queues < 2) { 256957dacad5SJay Sternberg dev_warn(dev->dev, "IO queues not created\n"); 257057dacad5SJay Sternberg nvme_dev_remove(dev); 257157dacad5SJay Sternberg } else { 257257dacad5SJay Sternberg nvme_unfreeze_queues(dev); 257357dacad5SJay Sternberg nvme_dev_add(dev); 257457dacad5SJay Sternberg } 257557dacad5SJay Sternberg 257657dacad5SJay Sternberg return; 257757dacad5SJay Sternberg 257857dacad5SJay Sternberg free_tags: 257957dacad5SJay Sternberg nvme_dev_remove_admin(dev); 25801c63dc66SChristoph Hellwig blk_put_queue(dev->ctrl.admin_q); 25811c63dc66SChristoph Hellwig dev->ctrl.admin_q = NULL; 258257dacad5SJay Sternberg dev->queues[0]->tags = NULL; 258357dacad5SJay Sternberg disable: 258457dacad5SJay Sternberg nvme_disable_queue(dev, 0); 258557dacad5SJay Sternberg nvme_dev_list_remove(dev); 258657dacad5SJay Sternberg unmap: 258757dacad5SJay Sternberg nvme_dev_unmap(dev); 258857dacad5SJay Sternberg out: 258957dacad5SJay Sternberg if (!work_busy(&dev->reset_work)) 259057dacad5SJay Sternberg nvme_dead_ctrl(dev); 259157dacad5SJay Sternberg } 259257dacad5SJay Sternberg 259357dacad5SJay Sternberg static int nvme_remove_dead_ctrl(void *arg) 259457dacad5SJay Sternberg { 259557dacad5SJay Sternberg struct nvme_dev *dev = (struct nvme_dev *)arg; 259657dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 259757dacad5SJay Sternberg 259857dacad5SJay Sternberg if (pci_get_drvdata(pdev)) 259957dacad5SJay Sternberg pci_stop_and_remove_bus_device_locked(pdev); 26001673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 260157dacad5SJay Sternberg return 0; 260257dacad5SJay Sternberg } 260357dacad5SJay Sternberg 260457dacad5SJay Sternberg static void nvme_dead_ctrl(struct nvme_dev *dev) 260557dacad5SJay Sternberg { 260657dacad5SJay Sternberg dev_warn(dev->dev, "Device failed to resume\n"); 26071673f1f0SChristoph Hellwig kref_get(&dev->ctrl.kref); 260857dacad5SJay Sternberg if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d", 26091c63dc66SChristoph Hellwig dev->ctrl.instance))) { 261057dacad5SJay Sternberg dev_err(dev->dev, 261157dacad5SJay Sternberg "Failed to start controller remove task\n"); 26121673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 261357dacad5SJay Sternberg } 261457dacad5SJay Sternberg } 261557dacad5SJay Sternberg 261657dacad5SJay Sternberg static void nvme_reset_work(struct work_struct *ws) 261757dacad5SJay Sternberg { 261857dacad5SJay Sternberg struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work); 261957dacad5SJay Sternberg bool in_probe = work_busy(&dev->probe_work); 262057dacad5SJay Sternberg 262157dacad5SJay Sternberg nvme_dev_shutdown(dev); 262257dacad5SJay Sternberg 262357dacad5SJay Sternberg /* Synchronize with device probe so that work will see failure status 262457dacad5SJay Sternberg * and exit gracefully without trying to schedule another reset */ 262557dacad5SJay Sternberg flush_work(&dev->probe_work); 262657dacad5SJay Sternberg 262757dacad5SJay Sternberg /* Fail this device if reset occured during probe to avoid 262857dacad5SJay Sternberg * infinite initialization loops. */ 262957dacad5SJay Sternberg if (in_probe) { 263057dacad5SJay Sternberg nvme_dead_ctrl(dev); 263157dacad5SJay Sternberg return; 263257dacad5SJay Sternberg } 263357dacad5SJay Sternberg /* Schedule device resume asynchronously so the reset work is available 263457dacad5SJay Sternberg * to cleanup errors that may occur during reinitialization */ 263557dacad5SJay Sternberg schedule_work(&dev->probe_work); 263657dacad5SJay Sternberg } 263757dacad5SJay Sternberg 263857dacad5SJay Sternberg static int __nvme_reset(struct nvme_dev *dev) 263957dacad5SJay Sternberg { 264057dacad5SJay Sternberg if (work_pending(&dev->reset_work)) 264157dacad5SJay Sternberg return -EBUSY; 264257dacad5SJay Sternberg list_del_init(&dev->node); 264357dacad5SJay Sternberg queue_work(nvme_workq, &dev->reset_work); 264457dacad5SJay Sternberg return 0; 264557dacad5SJay Sternberg } 264657dacad5SJay Sternberg 264757dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev) 264857dacad5SJay Sternberg { 264957dacad5SJay Sternberg int ret; 265057dacad5SJay Sternberg 26511c63dc66SChristoph Hellwig if (!dev->ctrl.admin_q || blk_queue_dying(dev->ctrl.admin_q)) 265257dacad5SJay Sternberg return -ENODEV; 265357dacad5SJay Sternberg 265457dacad5SJay Sternberg spin_lock(&dev_list_lock); 265557dacad5SJay Sternberg ret = __nvme_reset(dev); 265657dacad5SJay Sternberg spin_unlock(&dev_list_lock); 265757dacad5SJay Sternberg 265857dacad5SJay Sternberg if (!ret) { 265957dacad5SJay Sternberg flush_work(&dev->reset_work); 266057dacad5SJay Sternberg flush_work(&dev->probe_work); 266157dacad5SJay Sternberg return 0; 266257dacad5SJay Sternberg } 266357dacad5SJay Sternberg 266457dacad5SJay Sternberg return ret; 266557dacad5SJay Sternberg } 266657dacad5SJay Sternberg 266757dacad5SJay Sternberg static ssize_t nvme_sysfs_reset(struct device *dev, 266857dacad5SJay Sternberg struct device_attribute *attr, const char *buf, 266957dacad5SJay Sternberg size_t count) 267057dacad5SJay Sternberg { 267157dacad5SJay Sternberg struct nvme_dev *ndev = dev_get_drvdata(dev); 267257dacad5SJay Sternberg int ret; 267357dacad5SJay Sternberg 267457dacad5SJay Sternberg ret = nvme_reset(ndev); 267557dacad5SJay Sternberg if (ret < 0) 267657dacad5SJay Sternberg return ret; 267757dacad5SJay Sternberg 267857dacad5SJay Sternberg return count; 267957dacad5SJay Sternberg } 268057dacad5SJay Sternberg static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); 268157dacad5SJay Sternberg 26821c63dc66SChristoph Hellwig static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val) 26831c63dc66SChristoph Hellwig { 26841c63dc66SChristoph Hellwig *val = readl(to_nvme_dev(ctrl)->bar + off); 26851c63dc66SChristoph Hellwig return 0; 26861c63dc66SChristoph Hellwig } 26871c63dc66SChristoph Hellwig 26881c63dc66SChristoph Hellwig static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { 26891c63dc66SChristoph Hellwig .reg_read32 = nvme_pci_reg_read32, 26901673f1f0SChristoph Hellwig .free_ctrl = nvme_pci_free_ctrl, 26911c63dc66SChristoph Hellwig }; 26921c63dc66SChristoph Hellwig 269357dacad5SJay Sternberg static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 269457dacad5SJay Sternberg { 269557dacad5SJay Sternberg int node, result = -ENOMEM; 269657dacad5SJay Sternberg struct nvme_dev *dev; 269757dacad5SJay Sternberg 269857dacad5SJay Sternberg node = dev_to_node(&pdev->dev); 269957dacad5SJay Sternberg if (node == NUMA_NO_NODE) 270057dacad5SJay Sternberg set_dev_node(&pdev->dev, 0); 270157dacad5SJay Sternberg 270257dacad5SJay Sternberg dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); 270357dacad5SJay Sternberg if (!dev) 270457dacad5SJay Sternberg return -ENOMEM; 270557dacad5SJay Sternberg dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry), 270657dacad5SJay Sternberg GFP_KERNEL, node); 270757dacad5SJay Sternberg if (!dev->entry) 270857dacad5SJay Sternberg goto free; 270957dacad5SJay Sternberg dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), 271057dacad5SJay Sternberg GFP_KERNEL, node); 271157dacad5SJay Sternberg if (!dev->queues) 271257dacad5SJay Sternberg goto free; 271357dacad5SJay Sternberg 271457dacad5SJay Sternberg INIT_LIST_HEAD(&dev->namespaces); 271557dacad5SJay Sternberg INIT_WORK(&dev->reset_work, nvme_reset_work); 271657dacad5SJay Sternberg dev->dev = get_device(&pdev->dev); 271757dacad5SJay Sternberg pci_set_drvdata(pdev, dev); 27181c63dc66SChristoph Hellwig 27191c63dc66SChristoph Hellwig dev->ctrl.ops = &nvme_pci_ctrl_ops; 27201c63dc66SChristoph Hellwig dev->ctrl.dev = dev->dev; 2721106198edSChristoph Hellwig dev->ctrl.quirks = id->driver_data; 27221c63dc66SChristoph Hellwig 272357dacad5SJay Sternberg result = nvme_set_instance(dev); 272457dacad5SJay Sternberg if (result) 272557dacad5SJay Sternberg goto put_pci; 272657dacad5SJay Sternberg 272757dacad5SJay Sternberg result = nvme_setup_prp_pools(dev); 272857dacad5SJay Sternberg if (result) 272957dacad5SJay Sternberg goto release; 273057dacad5SJay Sternberg 27311673f1f0SChristoph Hellwig kref_init(&dev->ctrl.kref); 273257dacad5SJay Sternberg dev->device = device_create(nvme_class, &pdev->dev, 27331c63dc66SChristoph Hellwig MKDEV(nvme_char_major, dev->ctrl.instance), 27341c63dc66SChristoph Hellwig dev, "nvme%d", dev->ctrl.instance); 273557dacad5SJay Sternberg if (IS_ERR(dev->device)) { 273657dacad5SJay Sternberg result = PTR_ERR(dev->device); 273757dacad5SJay Sternberg goto release_pools; 273857dacad5SJay Sternberg } 273957dacad5SJay Sternberg get_device(dev->device); 274057dacad5SJay Sternberg dev_set_drvdata(dev->device, dev); 274157dacad5SJay Sternberg 274257dacad5SJay Sternberg result = device_create_file(dev->device, &dev_attr_reset_controller); 274357dacad5SJay Sternberg if (result) 274457dacad5SJay Sternberg goto put_dev; 274557dacad5SJay Sternberg 274657dacad5SJay Sternberg INIT_LIST_HEAD(&dev->node); 274757dacad5SJay Sternberg INIT_WORK(&dev->scan_work, nvme_dev_scan); 274857dacad5SJay Sternberg INIT_WORK(&dev->probe_work, nvme_probe_work); 274957dacad5SJay Sternberg schedule_work(&dev->probe_work); 275057dacad5SJay Sternberg return 0; 275157dacad5SJay Sternberg 275257dacad5SJay Sternberg put_dev: 27531c63dc66SChristoph Hellwig device_destroy(nvme_class, MKDEV(nvme_char_major, dev->ctrl.instance)); 275457dacad5SJay Sternberg put_device(dev->device); 275557dacad5SJay Sternberg release_pools: 275657dacad5SJay Sternberg nvme_release_prp_pools(dev); 275757dacad5SJay Sternberg release: 275857dacad5SJay Sternberg nvme_release_instance(dev); 275957dacad5SJay Sternberg put_pci: 276057dacad5SJay Sternberg put_device(dev->dev); 276157dacad5SJay Sternberg free: 276257dacad5SJay Sternberg kfree(dev->queues); 276357dacad5SJay Sternberg kfree(dev->entry); 276457dacad5SJay Sternberg kfree(dev); 276557dacad5SJay Sternberg return result; 276657dacad5SJay Sternberg } 276757dacad5SJay Sternberg 276857dacad5SJay Sternberg static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) 276957dacad5SJay Sternberg { 277057dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 277157dacad5SJay Sternberg 277257dacad5SJay Sternberg if (prepare) 277357dacad5SJay Sternberg nvme_dev_shutdown(dev); 277457dacad5SJay Sternberg else 277557dacad5SJay Sternberg schedule_work(&dev->probe_work); 277657dacad5SJay Sternberg } 277757dacad5SJay Sternberg 277857dacad5SJay Sternberg static void nvme_shutdown(struct pci_dev *pdev) 277957dacad5SJay Sternberg { 278057dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 278157dacad5SJay Sternberg nvme_dev_shutdown(dev); 278257dacad5SJay Sternberg } 278357dacad5SJay Sternberg 278457dacad5SJay Sternberg static void nvme_remove(struct pci_dev *pdev) 278557dacad5SJay Sternberg { 278657dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 278757dacad5SJay Sternberg 278857dacad5SJay Sternberg spin_lock(&dev_list_lock); 278957dacad5SJay Sternberg list_del_init(&dev->node); 279057dacad5SJay Sternberg spin_unlock(&dev_list_lock); 279157dacad5SJay Sternberg 279257dacad5SJay Sternberg pci_set_drvdata(pdev, NULL); 279357dacad5SJay Sternberg flush_work(&dev->probe_work); 279457dacad5SJay Sternberg flush_work(&dev->reset_work); 279557dacad5SJay Sternberg flush_work(&dev->scan_work); 279657dacad5SJay Sternberg device_remove_file(dev->device, &dev_attr_reset_controller); 279757dacad5SJay Sternberg nvme_dev_remove(dev); 279857dacad5SJay Sternberg nvme_dev_shutdown(dev); 279957dacad5SJay Sternberg nvme_dev_remove_admin(dev); 28001c63dc66SChristoph Hellwig device_destroy(nvme_class, MKDEV(nvme_char_major, dev->ctrl.instance)); 280157dacad5SJay Sternberg nvme_free_queues(dev, 0); 280257dacad5SJay Sternberg nvme_release_cmb(dev); 280357dacad5SJay Sternberg nvme_release_prp_pools(dev); 28041673f1f0SChristoph Hellwig nvme_put_ctrl(&dev->ctrl); 280557dacad5SJay Sternberg } 280657dacad5SJay Sternberg 280757dacad5SJay Sternberg /* These functions are yet to be implemented */ 280857dacad5SJay Sternberg #define nvme_error_detected NULL 280957dacad5SJay Sternberg #define nvme_dump_registers NULL 281057dacad5SJay Sternberg #define nvme_link_reset NULL 281157dacad5SJay Sternberg #define nvme_slot_reset NULL 281257dacad5SJay Sternberg #define nvme_error_resume NULL 281357dacad5SJay Sternberg 281457dacad5SJay Sternberg #ifdef CONFIG_PM_SLEEP 281557dacad5SJay Sternberg static int nvme_suspend(struct device *dev) 281657dacad5SJay Sternberg { 281757dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 281857dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 281957dacad5SJay Sternberg 282057dacad5SJay Sternberg nvme_dev_shutdown(ndev); 282157dacad5SJay Sternberg return 0; 282257dacad5SJay Sternberg } 282357dacad5SJay Sternberg 282457dacad5SJay Sternberg static int nvme_resume(struct device *dev) 282557dacad5SJay Sternberg { 282657dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 282757dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 282857dacad5SJay Sternberg 282957dacad5SJay Sternberg schedule_work(&ndev->probe_work); 283057dacad5SJay Sternberg return 0; 283157dacad5SJay Sternberg } 283257dacad5SJay Sternberg #endif 283357dacad5SJay Sternberg 283457dacad5SJay Sternberg static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); 283557dacad5SJay Sternberg 283657dacad5SJay Sternberg static const struct pci_error_handlers nvme_err_handler = { 283757dacad5SJay Sternberg .error_detected = nvme_error_detected, 283857dacad5SJay Sternberg .mmio_enabled = nvme_dump_registers, 283957dacad5SJay Sternberg .link_reset = nvme_link_reset, 284057dacad5SJay Sternberg .slot_reset = nvme_slot_reset, 284157dacad5SJay Sternberg .resume = nvme_error_resume, 284257dacad5SJay Sternberg .reset_notify = nvme_reset_notify, 284357dacad5SJay Sternberg }; 284457dacad5SJay Sternberg 284557dacad5SJay Sternberg /* Move to pci_ids.h later */ 284657dacad5SJay Sternberg #define PCI_CLASS_STORAGE_EXPRESS 0x010802 284757dacad5SJay Sternberg 284857dacad5SJay Sternberg static const struct pci_device_id nvme_id_table[] = { 2849106198edSChristoph Hellwig { PCI_VDEVICE(INTEL, 0x0953), 2850106198edSChristoph Hellwig .driver_data = NVME_QUIRK_STRIPE_SIZE, }, 285157dacad5SJay Sternberg { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, 2852c74dc780SStephan Günther { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, 285357dacad5SJay Sternberg { 0, } 285457dacad5SJay Sternberg }; 285557dacad5SJay Sternberg MODULE_DEVICE_TABLE(pci, nvme_id_table); 285657dacad5SJay Sternberg 285757dacad5SJay Sternberg static struct pci_driver nvme_driver = { 285857dacad5SJay Sternberg .name = "nvme", 285957dacad5SJay Sternberg .id_table = nvme_id_table, 286057dacad5SJay Sternberg .probe = nvme_probe, 286157dacad5SJay Sternberg .remove = nvme_remove, 286257dacad5SJay Sternberg .shutdown = nvme_shutdown, 286357dacad5SJay Sternberg .driver = { 286457dacad5SJay Sternberg .pm = &nvme_dev_pm_ops, 286557dacad5SJay Sternberg }, 286657dacad5SJay Sternberg .err_handler = &nvme_err_handler, 286757dacad5SJay Sternberg }; 286857dacad5SJay Sternberg 286957dacad5SJay Sternberg static int __init nvme_init(void) 287057dacad5SJay Sternberg { 287157dacad5SJay Sternberg int result; 287257dacad5SJay Sternberg 287357dacad5SJay Sternberg init_waitqueue_head(&nvme_kthread_wait); 287457dacad5SJay Sternberg 287557dacad5SJay Sternberg nvme_workq = create_singlethread_workqueue("nvme"); 287657dacad5SJay Sternberg if (!nvme_workq) 287757dacad5SJay Sternberg return -ENOMEM; 287857dacad5SJay Sternberg 287957dacad5SJay Sternberg result = register_blkdev(nvme_major, "nvme"); 288057dacad5SJay Sternberg if (result < 0) 288157dacad5SJay Sternberg goto kill_workq; 288257dacad5SJay Sternberg else if (result > 0) 288357dacad5SJay Sternberg nvme_major = result; 288457dacad5SJay Sternberg 288557dacad5SJay Sternberg result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme", 288657dacad5SJay Sternberg &nvme_dev_fops); 288757dacad5SJay Sternberg if (result < 0) 288857dacad5SJay Sternberg goto unregister_blkdev; 288957dacad5SJay Sternberg else if (result > 0) 289057dacad5SJay Sternberg nvme_char_major = result; 289157dacad5SJay Sternberg 289257dacad5SJay Sternberg nvme_class = class_create(THIS_MODULE, "nvme"); 289357dacad5SJay Sternberg if (IS_ERR(nvme_class)) { 289457dacad5SJay Sternberg result = PTR_ERR(nvme_class); 289557dacad5SJay Sternberg goto unregister_chrdev; 289657dacad5SJay Sternberg } 289757dacad5SJay Sternberg 289857dacad5SJay Sternberg result = pci_register_driver(&nvme_driver); 289957dacad5SJay Sternberg if (result) 290057dacad5SJay Sternberg goto destroy_class; 290157dacad5SJay Sternberg return 0; 290257dacad5SJay Sternberg 290357dacad5SJay Sternberg destroy_class: 290457dacad5SJay Sternberg class_destroy(nvme_class); 290557dacad5SJay Sternberg unregister_chrdev: 290657dacad5SJay Sternberg __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); 290757dacad5SJay Sternberg unregister_blkdev: 290857dacad5SJay Sternberg unregister_blkdev(nvme_major, "nvme"); 290957dacad5SJay Sternberg kill_workq: 291057dacad5SJay Sternberg destroy_workqueue(nvme_workq); 291157dacad5SJay Sternberg return result; 291257dacad5SJay Sternberg } 291357dacad5SJay Sternberg 291457dacad5SJay Sternberg static void __exit nvme_exit(void) 291557dacad5SJay Sternberg { 291657dacad5SJay Sternberg pci_unregister_driver(&nvme_driver); 291757dacad5SJay Sternberg unregister_blkdev(nvme_major, "nvme"); 291857dacad5SJay Sternberg destroy_workqueue(nvme_workq); 291957dacad5SJay Sternberg class_destroy(nvme_class); 292057dacad5SJay Sternberg __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); 292157dacad5SJay Sternberg BUG_ON(nvme_thread && !IS_ERR(nvme_thread)); 292257dacad5SJay Sternberg _nvme_check_size(); 292357dacad5SJay Sternberg } 292457dacad5SJay Sternberg 292557dacad5SJay Sternberg MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); 292657dacad5SJay Sternberg MODULE_LICENSE("GPL"); 292757dacad5SJay Sternberg MODULE_VERSION("1.0"); 292857dacad5SJay Sternberg module_init(nvme_init); 292957dacad5SJay Sternberg module_exit(nvme_exit); 2930