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> 4257dacad5SJay Sternberg #include <scsi/sg.h> 4357dacad5SJay Sternberg #include <asm-generic/io-64-nonatomic-lo-hi.h> 4457dacad5SJay Sternberg 4557dacad5SJay Sternberg #include <uapi/linux/nvme_ioctl.h> 4657dacad5SJay Sternberg #include "nvme.h" 4757dacad5SJay Sternberg 4857dacad5SJay Sternberg #define NVME_MINORS (1U << MINORBITS) 4957dacad5SJay Sternberg #define NVME_Q_DEPTH 1024 5057dacad5SJay Sternberg #define NVME_AQ_DEPTH 256 5157dacad5SJay Sternberg #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) 5257dacad5SJay Sternberg #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) 5357dacad5SJay Sternberg #define ADMIN_TIMEOUT (admin_timeout * HZ) 5457dacad5SJay Sternberg #define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ) 5557dacad5SJay Sternberg 5657dacad5SJay Sternberg static unsigned char admin_timeout = 60; 5757dacad5SJay Sternberg module_param(admin_timeout, byte, 0644); 5857dacad5SJay Sternberg MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); 5957dacad5SJay Sternberg 6057dacad5SJay Sternberg unsigned char nvme_io_timeout = 30; 6157dacad5SJay Sternberg module_param_named(io_timeout, nvme_io_timeout, byte, 0644); 6257dacad5SJay Sternberg MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); 6357dacad5SJay Sternberg 6457dacad5SJay Sternberg static unsigned char shutdown_timeout = 5; 6557dacad5SJay Sternberg module_param(shutdown_timeout, byte, 0644); 6657dacad5SJay Sternberg MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); 6757dacad5SJay Sternberg 6857dacad5SJay Sternberg static int nvme_major; 6957dacad5SJay Sternberg module_param(nvme_major, int, 0); 7057dacad5SJay Sternberg 7157dacad5SJay Sternberg static int nvme_char_major; 7257dacad5SJay Sternberg module_param(nvme_char_major, int, 0); 7357dacad5SJay Sternberg 7457dacad5SJay Sternberg static int use_threaded_interrupts; 7557dacad5SJay Sternberg module_param(use_threaded_interrupts, int, 0); 7657dacad5SJay Sternberg 7757dacad5SJay Sternberg static bool use_cmb_sqes = true; 7857dacad5SJay Sternberg module_param(use_cmb_sqes, bool, 0644); 7957dacad5SJay Sternberg MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); 8057dacad5SJay Sternberg 8157dacad5SJay Sternberg static DEFINE_SPINLOCK(dev_list_lock); 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 8957dacad5SJay Sternberg static int __nvme_reset(struct nvme_dev *dev); 9057dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev); 9157dacad5SJay Sternberg static int nvme_process_cq(struct nvme_queue *nvmeq); 9257dacad5SJay Sternberg static void nvme_dead_ctrl(struct nvme_dev *dev); 9357dacad5SJay Sternberg 9457dacad5SJay Sternberg struct async_cmd_info { 9557dacad5SJay Sternberg struct kthread_work work; 9657dacad5SJay Sternberg struct kthread_worker *worker; 9757dacad5SJay Sternberg struct request *req; 9857dacad5SJay Sternberg u32 result; 9957dacad5SJay Sternberg int status; 10057dacad5SJay Sternberg void *ctx; 10157dacad5SJay Sternberg }; 10257dacad5SJay Sternberg 10357dacad5SJay Sternberg /* 10457dacad5SJay Sternberg * An NVM Express queue. Each device has at least two (one for admin 10557dacad5SJay Sternberg * commands and one for I/O commands). 10657dacad5SJay Sternberg */ 10757dacad5SJay Sternberg struct nvme_queue { 10857dacad5SJay Sternberg struct device *q_dmadev; 10957dacad5SJay Sternberg struct nvme_dev *dev; 11057dacad5SJay Sternberg char irqname[24]; /* nvme4294967295-65535\0 */ 11157dacad5SJay Sternberg spinlock_t q_lock; 11257dacad5SJay Sternberg struct nvme_command *sq_cmds; 11357dacad5SJay Sternberg struct nvme_command __iomem *sq_cmds_io; 11457dacad5SJay Sternberg volatile struct nvme_completion *cqes; 11557dacad5SJay Sternberg struct blk_mq_tags **tags; 11657dacad5SJay Sternberg dma_addr_t sq_dma_addr; 11757dacad5SJay Sternberg dma_addr_t cq_dma_addr; 11857dacad5SJay Sternberg u32 __iomem *q_db; 11957dacad5SJay Sternberg u16 q_depth; 12057dacad5SJay Sternberg s16 cq_vector; 12157dacad5SJay Sternberg u16 sq_head; 12257dacad5SJay Sternberg u16 sq_tail; 12357dacad5SJay Sternberg u16 cq_head; 12457dacad5SJay Sternberg u16 qid; 12557dacad5SJay Sternberg u8 cq_phase; 12657dacad5SJay Sternberg u8 cqe_seen; 12757dacad5SJay Sternberg struct async_cmd_info cmdinfo; 12857dacad5SJay Sternberg }; 12957dacad5SJay Sternberg 13057dacad5SJay Sternberg /* 13157dacad5SJay Sternberg * Check we didin't inadvertently grow the command struct 13257dacad5SJay Sternberg */ 13357dacad5SJay Sternberg static inline void _nvme_check_size(void) 13457dacad5SJay Sternberg { 13557dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); 13657dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); 13757dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); 13857dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); 13957dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_features) != 64); 14057dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); 14157dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); 14257dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_command) != 64); 14357dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); 14457dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); 14557dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); 14657dacad5SJay Sternberg BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); 14757dacad5SJay Sternberg } 14857dacad5SJay Sternberg 14957dacad5SJay Sternberg typedef void (*nvme_completion_fn)(struct nvme_queue *, void *, 15057dacad5SJay Sternberg struct nvme_completion *); 15157dacad5SJay Sternberg 15257dacad5SJay Sternberg struct nvme_cmd_info { 15357dacad5SJay Sternberg nvme_completion_fn fn; 15457dacad5SJay Sternberg void *ctx; 15557dacad5SJay Sternberg int aborted; 15657dacad5SJay Sternberg struct nvme_queue *nvmeq; 15757dacad5SJay Sternberg struct nvme_iod iod[0]; 15857dacad5SJay Sternberg }; 15957dacad5SJay Sternberg 16057dacad5SJay Sternberg /* 16157dacad5SJay Sternberg * Max size of iod being embedded in the request payload 16257dacad5SJay Sternberg */ 16357dacad5SJay Sternberg #define NVME_INT_PAGES 2 16457dacad5SJay Sternberg #define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->page_size) 16557dacad5SJay Sternberg #define NVME_INT_MASK 0x01 16657dacad5SJay Sternberg 16757dacad5SJay Sternberg /* 16857dacad5SJay Sternberg * Will slightly overestimate the number of pages needed. This is OK 16957dacad5SJay Sternberg * as it only leads to a small amount of wasted memory for the lifetime of 17057dacad5SJay Sternberg * the I/O. 17157dacad5SJay Sternberg */ 17257dacad5SJay Sternberg static int nvme_npages(unsigned size, struct nvme_dev *dev) 17357dacad5SJay Sternberg { 17457dacad5SJay Sternberg unsigned nprps = DIV_ROUND_UP(size + dev->page_size, dev->page_size); 17557dacad5SJay Sternberg return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); 17657dacad5SJay Sternberg } 17757dacad5SJay Sternberg 17857dacad5SJay Sternberg static unsigned int nvme_cmd_size(struct nvme_dev *dev) 17957dacad5SJay Sternberg { 18057dacad5SJay Sternberg unsigned int ret = sizeof(struct nvme_cmd_info); 18157dacad5SJay Sternberg 18257dacad5SJay Sternberg ret += sizeof(struct nvme_iod); 18357dacad5SJay Sternberg ret += sizeof(__le64 *) * nvme_npages(NVME_INT_BYTES(dev), dev); 18457dacad5SJay Sternberg ret += sizeof(struct scatterlist) * NVME_INT_PAGES; 18557dacad5SJay Sternberg 18657dacad5SJay Sternberg return ret; 18757dacad5SJay Sternberg } 18857dacad5SJay Sternberg 18957dacad5SJay Sternberg static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 19057dacad5SJay Sternberg unsigned int hctx_idx) 19157dacad5SJay Sternberg { 19257dacad5SJay Sternberg struct nvme_dev *dev = data; 19357dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 19457dacad5SJay Sternberg 19557dacad5SJay Sternberg WARN_ON(hctx_idx != 0); 19657dacad5SJay Sternberg WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); 19757dacad5SJay Sternberg WARN_ON(nvmeq->tags); 19857dacad5SJay Sternberg 19957dacad5SJay Sternberg hctx->driver_data = nvmeq; 20057dacad5SJay Sternberg nvmeq->tags = &dev->admin_tagset.tags[0]; 20157dacad5SJay Sternberg return 0; 20257dacad5SJay Sternberg } 20357dacad5SJay Sternberg 20457dacad5SJay Sternberg static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) 20557dacad5SJay Sternberg { 20657dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 20757dacad5SJay Sternberg 20857dacad5SJay Sternberg nvmeq->tags = NULL; 20957dacad5SJay Sternberg } 21057dacad5SJay Sternberg 21157dacad5SJay Sternberg static int nvme_admin_init_request(void *data, struct request *req, 21257dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 21357dacad5SJay Sternberg unsigned int numa_node) 21457dacad5SJay Sternberg { 21557dacad5SJay Sternberg struct nvme_dev *dev = data; 21657dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 21757dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 21857dacad5SJay Sternberg 21957dacad5SJay Sternberg BUG_ON(!nvmeq); 22057dacad5SJay Sternberg cmd->nvmeq = nvmeq; 22157dacad5SJay Sternberg return 0; 22257dacad5SJay Sternberg } 22357dacad5SJay Sternberg 22457dacad5SJay Sternberg static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, 22557dacad5SJay Sternberg unsigned int hctx_idx) 22657dacad5SJay Sternberg { 22757dacad5SJay Sternberg struct nvme_dev *dev = data; 22857dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 22957dacad5SJay Sternberg 23057dacad5SJay Sternberg if (!nvmeq->tags) 23157dacad5SJay Sternberg nvmeq->tags = &dev->tagset.tags[hctx_idx]; 23257dacad5SJay Sternberg 23357dacad5SJay Sternberg WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); 23457dacad5SJay Sternberg hctx->driver_data = nvmeq; 23557dacad5SJay Sternberg return 0; 23657dacad5SJay Sternberg } 23757dacad5SJay Sternberg 23857dacad5SJay Sternberg static int nvme_init_request(void *data, struct request *req, 23957dacad5SJay Sternberg unsigned int hctx_idx, unsigned int rq_idx, 24057dacad5SJay Sternberg unsigned int numa_node) 24157dacad5SJay Sternberg { 24257dacad5SJay Sternberg struct nvme_dev *dev = data; 24357dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 24457dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; 24557dacad5SJay Sternberg 24657dacad5SJay Sternberg BUG_ON(!nvmeq); 24757dacad5SJay Sternberg cmd->nvmeq = nvmeq; 24857dacad5SJay Sternberg return 0; 24957dacad5SJay Sternberg } 25057dacad5SJay Sternberg 25157dacad5SJay Sternberg static void nvme_set_info(struct nvme_cmd_info *cmd, void *ctx, 25257dacad5SJay Sternberg nvme_completion_fn handler) 25357dacad5SJay Sternberg { 25457dacad5SJay Sternberg cmd->fn = handler; 25557dacad5SJay Sternberg cmd->ctx = ctx; 25657dacad5SJay Sternberg cmd->aborted = 0; 25757dacad5SJay Sternberg blk_mq_start_request(blk_mq_rq_from_pdu(cmd)); 25857dacad5SJay Sternberg } 25957dacad5SJay Sternberg 26057dacad5SJay Sternberg static void *iod_get_private(struct nvme_iod *iod) 26157dacad5SJay Sternberg { 26257dacad5SJay Sternberg return (void *) (iod->private & ~0x1UL); 26357dacad5SJay Sternberg } 26457dacad5SJay Sternberg 26557dacad5SJay Sternberg /* 26657dacad5SJay Sternberg * If bit 0 is set, the iod is embedded in the request payload. 26757dacad5SJay Sternberg */ 26857dacad5SJay Sternberg static bool iod_should_kfree(struct nvme_iod *iod) 26957dacad5SJay Sternberg { 27057dacad5SJay Sternberg return (iod->private & NVME_INT_MASK) == 0; 27157dacad5SJay Sternberg } 27257dacad5SJay Sternberg 27357dacad5SJay Sternberg /* Special values must be less than 0x1000 */ 27457dacad5SJay Sternberg #define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA) 27557dacad5SJay Sternberg #define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE) 27657dacad5SJay Sternberg #define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE) 27757dacad5SJay Sternberg #define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE) 27857dacad5SJay Sternberg 27957dacad5SJay Sternberg static void special_completion(struct nvme_queue *nvmeq, void *ctx, 28057dacad5SJay Sternberg struct nvme_completion *cqe) 28157dacad5SJay Sternberg { 28257dacad5SJay Sternberg if (ctx == CMD_CTX_CANCELLED) 28357dacad5SJay Sternberg return; 28457dacad5SJay Sternberg if (ctx == CMD_CTX_COMPLETED) { 28557dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, 28657dacad5SJay Sternberg "completed id %d twice on queue %d\n", 28757dacad5SJay Sternberg cqe->command_id, le16_to_cpup(&cqe->sq_id)); 28857dacad5SJay Sternberg return; 28957dacad5SJay Sternberg } 29057dacad5SJay Sternberg if (ctx == CMD_CTX_INVALID) { 29157dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, 29257dacad5SJay Sternberg "invalid id %d completed on queue %d\n", 29357dacad5SJay Sternberg cqe->command_id, le16_to_cpup(&cqe->sq_id)); 29457dacad5SJay Sternberg return; 29557dacad5SJay Sternberg } 29657dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Unknown special completion %p\n", ctx); 29757dacad5SJay Sternberg } 29857dacad5SJay Sternberg 29957dacad5SJay Sternberg static void *cancel_cmd_info(struct nvme_cmd_info *cmd, nvme_completion_fn *fn) 30057dacad5SJay Sternberg { 30157dacad5SJay Sternberg void *ctx; 30257dacad5SJay Sternberg 30357dacad5SJay Sternberg if (fn) 30457dacad5SJay Sternberg *fn = cmd->fn; 30557dacad5SJay Sternberg ctx = cmd->ctx; 30657dacad5SJay Sternberg cmd->fn = special_completion; 30757dacad5SJay Sternberg cmd->ctx = CMD_CTX_CANCELLED; 30857dacad5SJay Sternberg return ctx; 30957dacad5SJay Sternberg } 31057dacad5SJay Sternberg 31157dacad5SJay Sternberg static void async_req_completion(struct nvme_queue *nvmeq, void *ctx, 31257dacad5SJay Sternberg struct nvme_completion *cqe) 31357dacad5SJay Sternberg { 31457dacad5SJay Sternberg u32 result = le32_to_cpup(&cqe->result); 31557dacad5SJay Sternberg u16 status = le16_to_cpup(&cqe->status) >> 1; 31657dacad5SJay Sternberg 31757dacad5SJay Sternberg if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) 31857dacad5SJay Sternberg ++nvmeq->dev->event_limit; 31957dacad5SJay Sternberg if (status != NVME_SC_SUCCESS) 32057dacad5SJay Sternberg return; 32157dacad5SJay Sternberg 32257dacad5SJay Sternberg switch (result & 0xff07) { 32357dacad5SJay Sternberg case NVME_AER_NOTICE_NS_CHANGED: 32457dacad5SJay Sternberg dev_info(nvmeq->q_dmadev, "rescanning\n"); 32557dacad5SJay Sternberg schedule_work(&nvmeq->dev->scan_work); 32657dacad5SJay Sternberg default: 32757dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "async event result %08x\n", result); 32857dacad5SJay Sternberg } 32957dacad5SJay Sternberg } 33057dacad5SJay Sternberg 33157dacad5SJay Sternberg static void abort_completion(struct nvme_queue *nvmeq, void *ctx, 33257dacad5SJay Sternberg struct nvme_completion *cqe) 33357dacad5SJay Sternberg { 33457dacad5SJay Sternberg struct request *req = ctx; 33557dacad5SJay Sternberg 33657dacad5SJay Sternberg u16 status = le16_to_cpup(&cqe->status) >> 1; 33757dacad5SJay Sternberg u32 result = le32_to_cpup(&cqe->result); 33857dacad5SJay Sternberg 33957dacad5SJay Sternberg blk_mq_free_request(req); 34057dacad5SJay Sternberg 34157dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status, result); 34257dacad5SJay Sternberg ++nvmeq->dev->abort_limit; 34357dacad5SJay Sternberg } 34457dacad5SJay Sternberg 34557dacad5SJay Sternberg static void async_completion(struct nvme_queue *nvmeq, void *ctx, 34657dacad5SJay Sternberg struct nvme_completion *cqe) 34757dacad5SJay Sternberg { 34857dacad5SJay Sternberg struct async_cmd_info *cmdinfo = ctx; 34957dacad5SJay Sternberg cmdinfo->result = le32_to_cpup(&cqe->result); 35057dacad5SJay Sternberg cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; 35157dacad5SJay Sternberg queue_kthread_work(cmdinfo->worker, &cmdinfo->work); 35257dacad5SJay Sternberg blk_mq_free_request(cmdinfo->req); 35357dacad5SJay Sternberg } 35457dacad5SJay Sternberg 35557dacad5SJay Sternberg static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq, 35657dacad5SJay Sternberg unsigned int tag) 35757dacad5SJay Sternberg { 35857dacad5SJay Sternberg struct request *req = blk_mq_tag_to_rq(*nvmeq->tags, tag); 35957dacad5SJay Sternberg 36057dacad5SJay Sternberg return blk_mq_rq_to_pdu(req); 36157dacad5SJay Sternberg } 36257dacad5SJay Sternberg 36357dacad5SJay Sternberg /* 36457dacad5SJay Sternberg * Called with local interrupts disabled and the q_lock held. May not sleep. 36557dacad5SJay Sternberg */ 36657dacad5SJay Sternberg static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag, 36757dacad5SJay Sternberg nvme_completion_fn *fn) 36857dacad5SJay Sternberg { 36957dacad5SJay Sternberg struct nvme_cmd_info *cmd = get_cmd_from_tag(nvmeq, tag); 37057dacad5SJay Sternberg void *ctx; 37157dacad5SJay Sternberg if (tag >= nvmeq->q_depth) { 37257dacad5SJay Sternberg *fn = special_completion; 37357dacad5SJay Sternberg return CMD_CTX_INVALID; 37457dacad5SJay Sternberg } 37557dacad5SJay Sternberg if (fn) 37657dacad5SJay Sternberg *fn = cmd->fn; 37757dacad5SJay Sternberg ctx = cmd->ctx; 37857dacad5SJay Sternberg cmd->fn = special_completion; 37957dacad5SJay Sternberg cmd->ctx = CMD_CTX_COMPLETED; 38057dacad5SJay Sternberg return ctx; 38157dacad5SJay Sternberg } 38257dacad5SJay Sternberg 38357dacad5SJay Sternberg /** 38457dacad5SJay Sternberg * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell 38557dacad5SJay Sternberg * @nvmeq: The queue to use 38657dacad5SJay Sternberg * @cmd: The command to send 38757dacad5SJay Sternberg * 38857dacad5SJay Sternberg * Safe to use from interrupt context 38957dacad5SJay Sternberg */ 39057dacad5SJay Sternberg static void __nvme_submit_cmd(struct nvme_queue *nvmeq, 39157dacad5SJay Sternberg struct nvme_command *cmd) 39257dacad5SJay Sternberg { 39357dacad5SJay Sternberg u16 tail = nvmeq->sq_tail; 39457dacad5SJay Sternberg 39557dacad5SJay Sternberg if (nvmeq->sq_cmds_io) 39657dacad5SJay Sternberg memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); 39757dacad5SJay Sternberg else 39857dacad5SJay Sternberg memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); 39957dacad5SJay Sternberg 40057dacad5SJay Sternberg if (++tail == nvmeq->q_depth) 40157dacad5SJay Sternberg tail = 0; 40257dacad5SJay Sternberg writel(tail, nvmeq->q_db); 40357dacad5SJay Sternberg nvmeq->sq_tail = tail; 40457dacad5SJay Sternberg } 40557dacad5SJay Sternberg 40657dacad5SJay Sternberg static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) 40757dacad5SJay Sternberg { 40857dacad5SJay Sternberg unsigned long flags; 40957dacad5SJay Sternberg spin_lock_irqsave(&nvmeq->q_lock, flags); 41057dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, cmd); 41157dacad5SJay Sternberg spin_unlock_irqrestore(&nvmeq->q_lock, flags); 41257dacad5SJay Sternberg } 41357dacad5SJay Sternberg 41457dacad5SJay Sternberg static __le64 **iod_list(struct nvme_iod *iod) 41557dacad5SJay Sternberg { 41657dacad5SJay Sternberg return ((void *)iod) + iod->offset; 41757dacad5SJay Sternberg } 41857dacad5SJay Sternberg 41957dacad5SJay Sternberg static inline void iod_init(struct nvme_iod *iod, unsigned nbytes, 42057dacad5SJay Sternberg unsigned nseg, unsigned long private) 42157dacad5SJay Sternberg { 42257dacad5SJay Sternberg iod->private = private; 42357dacad5SJay Sternberg iod->offset = offsetof(struct nvme_iod, sg[nseg]); 42457dacad5SJay Sternberg iod->npages = -1; 42557dacad5SJay Sternberg iod->length = nbytes; 42657dacad5SJay Sternberg iod->nents = 0; 42757dacad5SJay Sternberg } 42857dacad5SJay Sternberg 42957dacad5SJay Sternberg static struct nvme_iod * 43057dacad5SJay Sternberg __nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev, 43157dacad5SJay Sternberg unsigned long priv, gfp_t gfp) 43257dacad5SJay Sternberg { 43357dacad5SJay Sternberg struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) + 43457dacad5SJay Sternberg sizeof(__le64 *) * nvme_npages(bytes, dev) + 43557dacad5SJay Sternberg sizeof(struct scatterlist) * nseg, gfp); 43657dacad5SJay Sternberg 43757dacad5SJay Sternberg if (iod) 43857dacad5SJay Sternberg iod_init(iod, bytes, nseg, priv); 43957dacad5SJay Sternberg 44057dacad5SJay Sternberg return iod; 44157dacad5SJay Sternberg } 44257dacad5SJay Sternberg 44357dacad5SJay Sternberg static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev, 44457dacad5SJay Sternberg gfp_t gfp) 44557dacad5SJay Sternberg { 44657dacad5SJay Sternberg unsigned size = !(rq->cmd_flags & REQ_DISCARD) ? blk_rq_bytes(rq) : 44757dacad5SJay Sternberg sizeof(struct nvme_dsm_range); 44857dacad5SJay Sternberg struct nvme_iod *iod; 44957dacad5SJay Sternberg 45057dacad5SJay Sternberg if (rq->nr_phys_segments <= NVME_INT_PAGES && 45157dacad5SJay Sternberg size <= NVME_INT_BYTES(dev)) { 45257dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(rq); 45357dacad5SJay Sternberg 45457dacad5SJay Sternberg iod = cmd->iod; 45557dacad5SJay Sternberg iod_init(iod, size, rq->nr_phys_segments, 45657dacad5SJay Sternberg (unsigned long) rq | NVME_INT_MASK); 45757dacad5SJay Sternberg return iod; 45857dacad5SJay Sternberg } 45957dacad5SJay Sternberg 46057dacad5SJay Sternberg return __nvme_alloc_iod(rq->nr_phys_segments, size, dev, 46157dacad5SJay Sternberg (unsigned long) rq, gfp); 46257dacad5SJay Sternberg } 46357dacad5SJay Sternberg 46457dacad5SJay Sternberg static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod) 46557dacad5SJay Sternberg { 46657dacad5SJay Sternberg const int last_prp = dev->page_size / 8 - 1; 46757dacad5SJay Sternberg int i; 46857dacad5SJay Sternberg __le64 **list = iod_list(iod); 46957dacad5SJay Sternberg dma_addr_t prp_dma = iod->first_dma; 47057dacad5SJay Sternberg 47157dacad5SJay Sternberg if (iod->npages == 0) 47257dacad5SJay Sternberg dma_pool_free(dev->prp_small_pool, list[0], prp_dma); 47357dacad5SJay Sternberg for (i = 0; i < iod->npages; i++) { 47457dacad5SJay Sternberg __le64 *prp_list = list[i]; 47557dacad5SJay Sternberg dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); 47657dacad5SJay Sternberg dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); 47757dacad5SJay Sternberg prp_dma = next_prp_dma; 47857dacad5SJay Sternberg } 47957dacad5SJay Sternberg 48057dacad5SJay Sternberg if (iod_should_kfree(iod)) 48157dacad5SJay Sternberg kfree(iod); 48257dacad5SJay Sternberg } 48357dacad5SJay Sternberg 48457dacad5SJay Sternberg static int nvme_error_status(u16 status) 48557dacad5SJay Sternberg { 48657dacad5SJay Sternberg switch (status & 0x7ff) { 48757dacad5SJay Sternberg case NVME_SC_SUCCESS: 48857dacad5SJay Sternberg return 0; 48957dacad5SJay Sternberg case NVME_SC_CAP_EXCEEDED: 49057dacad5SJay Sternberg return -ENOSPC; 49157dacad5SJay Sternberg default: 49257dacad5SJay Sternberg return -EIO; 49357dacad5SJay Sternberg } 49457dacad5SJay Sternberg } 49557dacad5SJay Sternberg 49657dacad5SJay Sternberg #ifdef CONFIG_BLK_DEV_INTEGRITY 49757dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 49857dacad5SJay Sternberg { 49957dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == v) 50057dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(p); 50157dacad5SJay Sternberg } 50257dacad5SJay Sternberg 50357dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 50457dacad5SJay Sternberg { 50557dacad5SJay Sternberg if (be32_to_cpu(pi->ref_tag) == p) 50657dacad5SJay Sternberg pi->ref_tag = cpu_to_be32(v); 50757dacad5SJay Sternberg } 50857dacad5SJay Sternberg 50957dacad5SJay Sternberg /** 51057dacad5SJay Sternberg * nvme_dif_remap - remaps ref tags to bip seed and physical lba 51157dacad5SJay Sternberg * 51257dacad5SJay Sternberg * The virtual start sector is the one that was originally submitted by the 51357dacad5SJay Sternberg * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical 51457dacad5SJay Sternberg * start sector may be different. Remap protection information to match the 51557dacad5SJay Sternberg * physical LBA on writes, and back to the original seed on reads. 51657dacad5SJay Sternberg * 51757dacad5SJay Sternberg * Type 0 and 3 do not have a ref tag, so no remapping required. 51857dacad5SJay Sternberg */ 51957dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 52057dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 52157dacad5SJay Sternberg { 52257dacad5SJay Sternberg struct nvme_ns *ns = req->rq_disk->private_data; 52357dacad5SJay Sternberg struct bio_integrity_payload *bip; 52457dacad5SJay Sternberg struct t10_pi_tuple *pi; 52557dacad5SJay Sternberg void *p, *pmap; 52657dacad5SJay Sternberg u32 i, nlb, ts, phys, virt; 52757dacad5SJay Sternberg 52857dacad5SJay Sternberg if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) 52957dacad5SJay Sternberg return; 53057dacad5SJay Sternberg 53157dacad5SJay Sternberg bip = bio_integrity(req->bio); 53257dacad5SJay Sternberg if (!bip) 53357dacad5SJay Sternberg return; 53457dacad5SJay Sternberg 53557dacad5SJay Sternberg pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; 53657dacad5SJay Sternberg 53757dacad5SJay Sternberg p = pmap; 53857dacad5SJay Sternberg virt = bip_get_seed(bip); 53957dacad5SJay Sternberg phys = nvme_block_nr(ns, blk_rq_pos(req)); 54057dacad5SJay Sternberg nlb = (blk_rq_bytes(req) >> ns->lba_shift); 54157dacad5SJay Sternberg ts = ns->disk->integrity->tuple_size; 54257dacad5SJay Sternberg 54357dacad5SJay Sternberg for (i = 0; i < nlb; i++, virt++, phys++) { 54457dacad5SJay Sternberg pi = (struct t10_pi_tuple *)p; 54557dacad5SJay Sternberg dif_swap(phys, virt, pi); 54657dacad5SJay Sternberg p += ts; 54757dacad5SJay Sternberg } 54857dacad5SJay Sternberg kunmap_atomic(pmap); 54957dacad5SJay Sternberg } 55057dacad5SJay Sternberg 55157dacad5SJay Sternberg static int nvme_noop_verify(struct blk_integrity_iter *iter) 55257dacad5SJay Sternberg { 55357dacad5SJay Sternberg return 0; 55457dacad5SJay Sternberg } 55557dacad5SJay Sternberg 55657dacad5SJay Sternberg static int nvme_noop_generate(struct blk_integrity_iter *iter) 55757dacad5SJay Sternberg { 55857dacad5SJay Sternberg return 0; 55957dacad5SJay Sternberg } 56057dacad5SJay Sternberg 56157dacad5SJay Sternberg struct blk_integrity nvme_meta_noop = { 56257dacad5SJay Sternberg .name = "NVME_META_NOOP", 56357dacad5SJay Sternberg .generate_fn = nvme_noop_generate, 56457dacad5SJay Sternberg .verify_fn = nvme_noop_verify, 56557dacad5SJay Sternberg }; 56657dacad5SJay Sternberg 56757dacad5SJay Sternberg static void nvme_init_integrity(struct nvme_ns *ns) 56857dacad5SJay Sternberg { 56957dacad5SJay Sternberg struct blk_integrity integrity; 57057dacad5SJay Sternberg 57157dacad5SJay Sternberg switch (ns->pi_type) { 57257dacad5SJay Sternberg case NVME_NS_DPS_PI_TYPE3: 57357dacad5SJay Sternberg integrity = t10_pi_type3_crc; 57457dacad5SJay Sternberg break; 57557dacad5SJay Sternberg case NVME_NS_DPS_PI_TYPE1: 57657dacad5SJay Sternberg case NVME_NS_DPS_PI_TYPE2: 57757dacad5SJay Sternberg integrity = t10_pi_type1_crc; 57857dacad5SJay Sternberg break; 57957dacad5SJay Sternberg default: 58057dacad5SJay Sternberg integrity = nvme_meta_noop; 58157dacad5SJay Sternberg break; 58257dacad5SJay Sternberg } 58357dacad5SJay Sternberg integrity.tuple_size = ns->ms; 58457dacad5SJay Sternberg blk_integrity_register(ns->disk, &integrity); 58557dacad5SJay Sternberg blk_queue_max_integrity_segments(ns->queue, 1); 58657dacad5SJay Sternberg } 58757dacad5SJay Sternberg #else /* CONFIG_BLK_DEV_INTEGRITY */ 58857dacad5SJay Sternberg static void nvme_dif_remap(struct request *req, 58957dacad5SJay Sternberg void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) 59057dacad5SJay Sternberg { 59157dacad5SJay Sternberg } 59257dacad5SJay Sternberg static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) 59357dacad5SJay Sternberg { 59457dacad5SJay Sternberg } 59557dacad5SJay Sternberg static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) 59657dacad5SJay Sternberg { 59757dacad5SJay Sternberg } 59857dacad5SJay Sternberg static void nvme_init_integrity(struct nvme_ns *ns) 59957dacad5SJay Sternberg { 60057dacad5SJay Sternberg } 60157dacad5SJay Sternberg #endif 60257dacad5SJay Sternberg 60357dacad5SJay Sternberg static void req_completion(struct nvme_queue *nvmeq, void *ctx, 60457dacad5SJay Sternberg struct nvme_completion *cqe) 60557dacad5SJay Sternberg { 60657dacad5SJay Sternberg struct nvme_iod *iod = ctx; 60757dacad5SJay Sternberg struct request *req = iod_get_private(iod); 60857dacad5SJay Sternberg struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); 60957dacad5SJay Sternberg u16 status = le16_to_cpup(&cqe->status) >> 1; 610ef658fc2SJens Axboe int error = 0; 61157dacad5SJay Sternberg 61257dacad5SJay Sternberg if (unlikely(status)) { 61357dacad5SJay Sternberg if (!(status & NVME_SC_DNR || blk_noretry_request(req)) 61457dacad5SJay Sternberg && (jiffies - req->start_time) < req->timeout) { 61557dacad5SJay Sternberg unsigned long flags; 61657dacad5SJay Sternberg 61757dacad5SJay Sternberg blk_mq_requeue_request(req); 61857dacad5SJay Sternberg spin_lock_irqsave(req->q->queue_lock, flags); 61957dacad5SJay Sternberg if (!blk_queue_stopped(req->q)) 62057dacad5SJay Sternberg blk_mq_kick_requeue_list(req->q); 62157dacad5SJay Sternberg spin_unlock_irqrestore(req->q->queue_lock, flags); 62257dacad5SJay Sternberg return; 62357dacad5SJay Sternberg } 62457dacad5SJay Sternberg 62557dacad5SJay Sternberg if (req->cmd_type == REQ_TYPE_DRV_PRIV) { 62657dacad5SJay Sternberg if (cmd_rq->ctx == CMD_CTX_CANCELLED) 6271951feaeSChristoph Hellwig error = -EINTR; 6281951feaeSChristoph Hellwig else 6291951feaeSChristoph Hellwig error = status; 63057dacad5SJay Sternberg } else { 6311951feaeSChristoph Hellwig error = nvme_error_status(status); 63257dacad5SJay Sternberg } 63357dacad5SJay Sternberg } 63457dacad5SJay Sternberg 63557dacad5SJay Sternberg if (req->cmd_type == REQ_TYPE_DRV_PRIV) { 63657dacad5SJay Sternberg u32 result = le32_to_cpup(&cqe->result); 63757dacad5SJay Sternberg req->special = (void *)(uintptr_t)result; 63857dacad5SJay Sternberg } 63957dacad5SJay Sternberg 64057dacad5SJay Sternberg if (cmd_rq->aborted) 64157dacad5SJay Sternberg dev_warn(nvmeq->dev->dev, 64257dacad5SJay Sternberg "completing aborted command with status:%04x\n", 6431951feaeSChristoph Hellwig error); 64457dacad5SJay Sternberg 64557dacad5SJay Sternberg if (iod->nents) { 64657dacad5SJay Sternberg dma_unmap_sg(nvmeq->dev->dev, iod->sg, iod->nents, 64757dacad5SJay Sternberg rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 64857dacad5SJay Sternberg if (blk_integrity_rq(req)) { 64957dacad5SJay Sternberg if (!rq_data_dir(req)) 65057dacad5SJay Sternberg nvme_dif_remap(req, nvme_dif_complete); 65157dacad5SJay Sternberg dma_unmap_sg(nvmeq->dev->dev, iod->meta_sg, 1, 65257dacad5SJay Sternberg rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); 65357dacad5SJay Sternberg } 65457dacad5SJay Sternberg } 65557dacad5SJay Sternberg nvme_free_iod(nvmeq->dev, iod); 65657dacad5SJay Sternberg 6571951feaeSChristoph Hellwig blk_mq_complete_request(req, error); 65857dacad5SJay Sternberg } 65957dacad5SJay Sternberg 66057dacad5SJay Sternberg /* length is in bytes. gfp flags indicates whether we may sleep. */ 66157dacad5SJay Sternberg static int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod, 66257dacad5SJay Sternberg int total_len, gfp_t gfp) 66357dacad5SJay Sternberg { 66457dacad5SJay Sternberg struct dma_pool *pool; 66557dacad5SJay Sternberg int length = total_len; 66657dacad5SJay Sternberg struct scatterlist *sg = iod->sg; 66757dacad5SJay Sternberg int dma_len = sg_dma_len(sg); 66857dacad5SJay Sternberg u64 dma_addr = sg_dma_address(sg); 66957dacad5SJay Sternberg u32 page_size = dev->page_size; 67057dacad5SJay Sternberg int offset = dma_addr & (page_size - 1); 67157dacad5SJay Sternberg __le64 *prp_list; 67257dacad5SJay Sternberg __le64 **list = iod_list(iod); 67357dacad5SJay Sternberg dma_addr_t prp_dma; 67457dacad5SJay Sternberg int nprps, i; 67557dacad5SJay Sternberg 67657dacad5SJay Sternberg length -= (page_size - offset); 67757dacad5SJay Sternberg if (length <= 0) 67857dacad5SJay Sternberg return total_len; 67957dacad5SJay Sternberg 68057dacad5SJay Sternberg dma_len -= (page_size - offset); 68157dacad5SJay Sternberg if (dma_len) { 68257dacad5SJay Sternberg dma_addr += (page_size - offset); 68357dacad5SJay Sternberg } else { 68457dacad5SJay Sternberg sg = sg_next(sg); 68557dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 68657dacad5SJay Sternberg dma_len = sg_dma_len(sg); 68757dacad5SJay Sternberg } 68857dacad5SJay Sternberg 68957dacad5SJay Sternberg if (length <= page_size) { 69057dacad5SJay Sternberg iod->first_dma = dma_addr; 69157dacad5SJay Sternberg return total_len; 69257dacad5SJay Sternberg } 69357dacad5SJay Sternberg 69457dacad5SJay Sternberg nprps = DIV_ROUND_UP(length, page_size); 69557dacad5SJay Sternberg if (nprps <= (256 / 8)) { 69657dacad5SJay Sternberg pool = dev->prp_small_pool; 69757dacad5SJay Sternberg iod->npages = 0; 69857dacad5SJay Sternberg } else { 69957dacad5SJay Sternberg pool = dev->prp_page_pool; 70057dacad5SJay Sternberg iod->npages = 1; 70157dacad5SJay Sternberg } 70257dacad5SJay Sternberg 70357dacad5SJay Sternberg prp_list = dma_pool_alloc(pool, gfp, &prp_dma); 70457dacad5SJay Sternberg if (!prp_list) { 70557dacad5SJay Sternberg iod->first_dma = dma_addr; 70657dacad5SJay Sternberg iod->npages = -1; 70757dacad5SJay Sternberg return (total_len - length) + page_size; 70857dacad5SJay Sternberg } 70957dacad5SJay Sternberg list[0] = prp_list; 71057dacad5SJay Sternberg iod->first_dma = prp_dma; 71157dacad5SJay Sternberg i = 0; 71257dacad5SJay Sternberg for (;;) { 71357dacad5SJay Sternberg if (i == page_size >> 3) { 71457dacad5SJay Sternberg __le64 *old_prp_list = prp_list; 71557dacad5SJay Sternberg prp_list = dma_pool_alloc(pool, gfp, &prp_dma); 71657dacad5SJay Sternberg if (!prp_list) 71757dacad5SJay Sternberg return total_len - length; 71857dacad5SJay Sternberg list[iod->npages++] = prp_list; 71957dacad5SJay Sternberg prp_list[0] = old_prp_list[i - 1]; 72057dacad5SJay Sternberg old_prp_list[i - 1] = cpu_to_le64(prp_dma); 72157dacad5SJay Sternberg i = 1; 72257dacad5SJay Sternberg } 72357dacad5SJay Sternberg prp_list[i++] = cpu_to_le64(dma_addr); 72457dacad5SJay Sternberg dma_len -= page_size; 72557dacad5SJay Sternberg dma_addr += page_size; 72657dacad5SJay Sternberg length -= page_size; 72757dacad5SJay Sternberg if (length <= 0) 72857dacad5SJay Sternberg break; 72957dacad5SJay Sternberg if (dma_len > 0) 73057dacad5SJay Sternberg continue; 73157dacad5SJay Sternberg BUG_ON(dma_len < 0); 73257dacad5SJay Sternberg sg = sg_next(sg); 73357dacad5SJay Sternberg dma_addr = sg_dma_address(sg); 73457dacad5SJay Sternberg dma_len = sg_dma_len(sg); 73557dacad5SJay Sternberg } 73657dacad5SJay Sternberg 73757dacad5SJay Sternberg return total_len; 73857dacad5SJay Sternberg } 73957dacad5SJay Sternberg 74057dacad5SJay Sternberg static void nvme_submit_priv(struct nvme_queue *nvmeq, struct request *req, 74157dacad5SJay Sternberg struct nvme_iod *iod) 74257dacad5SJay Sternberg { 74357dacad5SJay Sternberg struct nvme_command cmnd; 74457dacad5SJay Sternberg 74557dacad5SJay Sternberg memcpy(&cmnd, req->cmd, sizeof(cmnd)); 74657dacad5SJay Sternberg cmnd.rw.command_id = req->tag; 74757dacad5SJay Sternberg if (req->nr_phys_segments) { 74857dacad5SJay Sternberg cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); 74957dacad5SJay Sternberg cmnd.rw.prp2 = cpu_to_le64(iod->first_dma); 75057dacad5SJay Sternberg } 75157dacad5SJay Sternberg 75257dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, &cmnd); 75357dacad5SJay Sternberg } 75457dacad5SJay Sternberg 75557dacad5SJay Sternberg /* 75657dacad5SJay Sternberg * We reuse the small pool to allocate the 16-byte range here as it is not 75757dacad5SJay Sternberg * worth having a special pool for these or additional cases to handle freeing 75857dacad5SJay Sternberg * the iod. 75957dacad5SJay Sternberg */ 76057dacad5SJay Sternberg static void nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, 76157dacad5SJay Sternberg struct request *req, struct nvme_iod *iod) 76257dacad5SJay Sternberg { 76357dacad5SJay Sternberg struct nvme_dsm_range *range = 76457dacad5SJay Sternberg (struct nvme_dsm_range *)iod_list(iod)[0]; 76557dacad5SJay Sternberg struct nvme_command cmnd; 76657dacad5SJay Sternberg 76757dacad5SJay Sternberg range->cattr = cpu_to_le32(0); 76857dacad5SJay Sternberg range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift); 76957dacad5SJay Sternberg range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); 77057dacad5SJay Sternberg 77157dacad5SJay Sternberg memset(&cmnd, 0, sizeof(cmnd)); 77257dacad5SJay Sternberg cmnd.dsm.opcode = nvme_cmd_dsm; 77357dacad5SJay Sternberg cmnd.dsm.command_id = req->tag; 77457dacad5SJay Sternberg cmnd.dsm.nsid = cpu_to_le32(ns->ns_id); 77557dacad5SJay Sternberg cmnd.dsm.prp1 = cpu_to_le64(iod->first_dma); 77657dacad5SJay Sternberg cmnd.dsm.nr = 0; 77757dacad5SJay Sternberg cmnd.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); 77857dacad5SJay Sternberg 77957dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, &cmnd); 78057dacad5SJay Sternberg } 78157dacad5SJay Sternberg 78257dacad5SJay Sternberg static void nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns, 78357dacad5SJay Sternberg int cmdid) 78457dacad5SJay Sternberg { 78557dacad5SJay Sternberg struct nvme_command cmnd; 78657dacad5SJay Sternberg 78757dacad5SJay Sternberg memset(&cmnd, 0, sizeof(cmnd)); 78857dacad5SJay Sternberg cmnd.common.opcode = nvme_cmd_flush; 78957dacad5SJay Sternberg cmnd.common.command_id = cmdid; 79057dacad5SJay Sternberg cmnd.common.nsid = cpu_to_le32(ns->ns_id); 79157dacad5SJay Sternberg 79257dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, &cmnd); 79357dacad5SJay Sternberg } 79457dacad5SJay Sternberg 79557dacad5SJay Sternberg static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod, 79657dacad5SJay Sternberg struct nvme_ns *ns) 79757dacad5SJay Sternberg { 79857dacad5SJay Sternberg struct request *req = iod_get_private(iod); 79957dacad5SJay Sternberg struct nvme_command cmnd; 80057dacad5SJay Sternberg u16 control = 0; 80157dacad5SJay Sternberg u32 dsmgmt = 0; 80257dacad5SJay Sternberg 80357dacad5SJay Sternberg if (req->cmd_flags & REQ_FUA) 80457dacad5SJay Sternberg control |= NVME_RW_FUA; 80557dacad5SJay Sternberg if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD)) 80657dacad5SJay Sternberg control |= NVME_RW_LR; 80757dacad5SJay Sternberg 80857dacad5SJay Sternberg if (req->cmd_flags & REQ_RAHEAD) 80957dacad5SJay Sternberg dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; 81057dacad5SJay Sternberg 81157dacad5SJay Sternberg memset(&cmnd, 0, sizeof(cmnd)); 81257dacad5SJay Sternberg cmnd.rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); 81357dacad5SJay Sternberg cmnd.rw.command_id = req->tag; 81457dacad5SJay Sternberg cmnd.rw.nsid = cpu_to_le32(ns->ns_id); 81557dacad5SJay Sternberg cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); 81657dacad5SJay Sternberg cmnd.rw.prp2 = cpu_to_le64(iod->first_dma); 81757dacad5SJay Sternberg cmnd.rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); 81857dacad5SJay Sternberg cmnd.rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); 81957dacad5SJay Sternberg 82057dacad5SJay Sternberg if (ns->ms) { 82157dacad5SJay Sternberg switch (ns->pi_type) { 82257dacad5SJay Sternberg case NVME_NS_DPS_PI_TYPE3: 82357dacad5SJay Sternberg control |= NVME_RW_PRINFO_PRCHK_GUARD; 82457dacad5SJay Sternberg break; 82557dacad5SJay Sternberg case NVME_NS_DPS_PI_TYPE1: 82657dacad5SJay Sternberg case NVME_NS_DPS_PI_TYPE2: 82757dacad5SJay Sternberg control |= NVME_RW_PRINFO_PRCHK_GUARD | 82857dacad5SJay Sternberg NVME_RW_PRINFO_PRCHK_REF; 82957dacad5SJay Sternberg cmnd.rw.reftag = cpu_to_le32( 83057dacad5SJay Sternberg nvme_block_nr(ns, blk_rq_pos(req))); 83157dacad5SJay Sternberg break; 83257dacad5SJay Sternberg } 83357dacad5SJay Sternberg if (blk_integrity_rq(req)) 83457dacad5SJay Sternberg cmnd.rw.metadata = 83557dacad5SJay Sternberg cpu_to_le64(sg_dma_address(iod->meta_sg)); 83657dacad5SJay Sternberg else 83757dacad5SJay Sternberg control |= NVME_RW_PRINFO_PRACT; 83857dacad5SJay Sternberg } 83957dacad5SJay Sternberg 84057dacad5SJay Sternberg cmnd.rw.control = cpu_to_le16(control); 84157dacad5SJay Sternberg cmnd.rw.dsmgmt = cpu_to_le32(dsmgmt); 84257dacad5SJay Sternberg 84357dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, &cmnd); 84457dacad5SJay Sternberg 84557dacad5SJay Sternberg return 0; 84657dacad5SJay Sternberg } 84757dacad5SJay Sternberg 84857dacad5SJay Sternberg /* 84957dacad5SJay Sternberg * NOTE: ns is NULL when called on the admin queue. 85057dacad5SJay Sternberg */ 85157dacad5SJay Sternberg static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, 85257dacad5SJay Sternberg const struct blk_mq_queue_data *bd) 85357dacad5SJay Sternberg { 85457dacad5SJay Sternberg struct nvme_ns *ns = hctx->queue->queuedata; 85557dacad5SJay Sternberg struct nvme_queue *nvmeq = hctx->driver_data; 85657dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 85757dacad5SJay Sternberg struct request *req = bd->rq; 85857dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 85957dacad5SJay Sternberg struct nvme_iod *iod; 86057dacad5SJay Sternberg enum dma_data_direction dma_dir; 86157dacad5SJay Sternberg 86257dacad5SJay Sternberg /* 86357dacad5SJay Sternberg * If formated with metadata, require the block layer provide a buffer 86457dacad5SJay Sternberg * unless this namespace is formated such that the metadata can be 86557dacad5SJay Sternberg * stripped/generated by the controller with PRACT=1. 86657dacad5SJay Sternberg */ 86757dacad5SJay Sternberg if (ns && ns->ms && !blk_integrity_rq(req)) { 86857dacad5SJay Sternberg if (!(ns->pi_type && ns->ms == 8) && 86957dacad5SJay Sternberg req->cmd_type != REQ_TYPE_DRV_PRIV) { 87057dacad5SJay Sternberg blk_mq_complete_request(req, -EFAULT); 87157dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 87257dacad5SJay Sternberg } 87357dacad5SJay Sternberg } 87457dacad5SJay Sternberg 87557dacad5SJay Sternberg iod = nvme_alloc_iod(req, dev, GFP_ATOMIC); 87657dacad5SJay Sternberg if (!iod) 87757dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_BUSY; 87857dacad5SJay Sternberg 87957dacad5SJay Sternberg if (req->cmd_flags & REQ_DISCARD) { 88057dacad5SJay Sternberg void *range; 88157dacad5SJay Sternberg /* 88257dacad5SJay Sternberg * We reuse the small pool to allocate the 16-byte range here 88357dacad5SJay Sternberg * as it is not worth having a special pool for these or 88457dacad5SJay Sternberg * additional cases to handle freeing the iod. 88557dacad5SJay Sternberg */ 88657dacad5SJay Sternberg range = dma_pool_alloc(dev->prp_small_pool, GFP_ATOMIC, 88757dacad5SJay Sternberg &iod->first_dma); 88857dacad5SJay Sternberg if (!range) 88957dacad5SJay Sternberg goto retry_cmd; 89057dacad5SJay Sternberg iod_list(iod)[0] = (__le64 *)range; 89157dacad5SJay Sternberg iod->npages = 0; 89257dacad5SJay Sternberg } else if (req->nr_phys_segments) { 89357dacad5SJay Sternberg dma_dir = rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; 89457dacad5SJay Sternberg 89557dacad5SJay Sternberg sg_init_table(iod->sg, req->nr_phys_segments); 89657dacad5SJay Sternberg iod->nents = blk_rq_map_sg(req->q, req, iod->sg); 89757dacad5SJay Sternberg if (!iod->nents) 89857dacad5SJay Sternberg goto error_cmd; 89957dacad5SJay Sternberg 90057dacad5SJay Sternberg if (!dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents, dma_dir)) 90157dacad5SJay Sternberg goto retry_cmd; 90257dacad5SJay Sternberg 90357dacad5SJay Sternberg if (blk_rq_bytes(req) != 90457dacad5SJay Sternberg nvme_setup_prps(dev, iod, blk_rq_bytes(req), GFP_ATOMIC)) { 90557dacad5SJay Sternberg dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); 90657dacad5SJay Sternberg goto retry_cmd; 90757dacad5SJay Sternberg } 90857dacad5SJay Sternberg if (blk_integrity_rq(req)) { 90957dacad5SJay Sternberg if (blk_rq_count_integrity_sg(req->q, req->bio) != 1) 91057dacad5SJay Sternberg goto error_cmd; 91157dacad5SJay Sternberg 91257dacad5SJay Sternberg sg_init_table(iod->meta_sg, 1); 91357dacad5SJay Sternberg if (blk_rq_map_integrity_sg( 91457dacad5SJay Sternberg req->q, req->bio, iod->meta_sg) != 1) 91557dacad5SJay Sternberg goto error_cmd; 91657dacad5SJay Sternberg 91757dacad5SJay Sternberg if (rq_data_dir(req)) 91857dacad5SJay Sternberg nvme_dif_remap(req, nvme_dif_prep); 91957dacad5SJay Sternberg 92057dacad5SJay Sternberg if (!dma_map_sg(nvmeq->q_dmadev, iod->meta_sg, 1, dma_dir)) 92157dacad5SJay Sternberg goto error_cmd; 92257dacad5SJay Sternberg } 92357dacad5SJay Sternberg } 92457dacad5SJay Sternberg 92557dacad5SJay Sternberg nvme_set_info(cmd, iod, req_completion); 92657dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 92757dacad5SJay Sternberg if (req->cmd_type == REQ_TYPE_DRV_PRIV) 92857dacad5SJay Sternberg nvme_submit_priv(nvmeq, req, iod); 92957dacad5SJay Sternberg else if (req->cmd_flags & REQ_DISCARD) 93057dacad5SJay Sternberg nvme_submit_discard(nvmeq, ns, req, iod); 93157dacad5SJay Sternberg else if (req->cmd_flags & REQ_FLUSH) 93257dacad5SJay Sternberg nvme_submit_flush(nvmeq, ns, req->tag); 93357dacad5SJay Sternberg else 93457dacad5SJay Sternberg nvme_submit_iod(nvmeq, iod, ns); 93557dacad5SJay Sternberg 93657dacad5SJay Sternberg nvme_process_cq(nvmeq); 93757dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 93857dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_OK; 93957dacad5SJay Sternberg 94057dacad5SJay Sternberg error_cmd: 94157dacad5SJay Sternberg nvme_free_iod(dev, iod); 94257dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_ERROR; 94357dacad5SJay Sternberg retry_cmd: 94457dacad5SJay Sternberg nvme_free_iod(dev, iod); 94557dacad5SJay Sternberg return BLK_MQ_RQ_QUEUE_BUSY; 94657dacad5SJay Sternberg } 94757dacad5SJay Sternberg 94857dacad5SJay Sternberg static int nvme_process_cq(struct nvme_queue *nvmeq) 94957dacad5SJay Sternberg { 95057dacad5SJay Sternberg u16 head, phase; 95157dacad5SJay Sternberg 95257dacad5SJay Sternberg head = nvmeq->cq_head; 95357dacad5SJay Sternberg phase = nvmeq->cq_phase; 95457dacad5SJay Sternberg 95557dacad5SJay Sternberg for (;;) { 95657dacad5SJay Sternberg void *ctx; 95757dacad5SJay Sternberg nvme_completion_fn fn; 95857dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[head]; 95957dacad5SJay Sternberg if ((le16_to_cpu(cqe.status) & 1) != phase) 96057dacad5SJay Sternberg break; 96157dacad5SJay Sternberg nvmeq->sq_head = le16_to_cpu(cqe.sq_head); 96257dacad5SJay Sternberg if (++head == nvmeq->q_depth) { 96357dacad5SJay Sternberg head = 0; 96457dacad5SJay Sternberg phase = !phase; 96557dacad5SJay Sternberg } 96657dacad5SJay Sternberg ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn); 96757dacad5SJay Sternberg fn(nvmeq, ctx, &cqe); 96857dacad5SJay Sternberg } 96957dacad5SJay Sternberg 97057dacad5SJay Sternberg /* If the controller ignores the cq head doorbell and continuously 97157dacad5SJay Sternberg * writes to the queue, it is theoretically possible to wrap around 97257dacad5SJay Sternberg * the queue twice and mistakenly return IRQ_NONE. Linux only 97357dacad5SJay Sternberg * requires that 0.1% of your interrupts are handled, so this isn't 97457dacad5SJay Sternberg * a big problem. 97557dacad5SJay Sternberg */ 97657dacad5SJay Sternberg if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) 97757dacad5SJay Sternberg return 0; 97857dacad5SJay Sternberg 97957dacad5SJay Sternberg writel(head, nvmeq->q_db + nvmeq->dev->db_stride); 98057dacad5SJay Sternberg nvmeq->cq_head = head; 98157dacad5SJay Sternberg nvmeq->cq_phase = phase; 98257dacad5SJay Sternberg 98357dacad5SJay Sternberg nvmeq->cqe_seen = 1; 98457dacad5SJay Sternberg return 1; 98557dacad5SJay Sternberg } 98657dacad5SJay Sternberg 98757dacad5SJay Sternberg static irqreturn_t nvme_irq(int irq, void *data) 98857dacad5SJay Sternberg { 98957dacad5SJay Sternberg irqreturn_t result; 99057dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 99157dacad5SJay Sternberg spin_lock(&nvmeq->q_lock); 99257dacad5SJay Sternberg nvme_process_cq(nvmeq); 99357dacad5SJay Sternberg result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; 99457dacad5SJay Sternberg nvmeq->cqe_seen = 0; 99557dacad5SJay Sternberg spin_unlock(&nvmeq->q_lock); 99657dacad5SJay Sternberg return result; 99757dacad5SJay Sternberg } 99857dacad5SJay Sternberg 99957dacad5SJay Sternberg static irqreturn_t nvme_irq_check(int irq, void *data) 100057dacad5SJay Sternberg { 100157dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 100257dacad5SJay Sternberg struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; 100357dacad5SJay Sternberg if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) 100457dacad5SJay Sternberg return IRQ_NONE; 100557dacad5SJay Sternberg return IRQ_WAKE_THREAD; 100657dacad5SJay Sternberg } 100757dacad5SJay Sternberg 100857dacad5SJay Sternberg /* 100957dacad5SJay Sternberg * Returns 0 on success. If the result is negative, it's a Linux error code; 101057dacad5SJay Sternberg * if the result is positive, it's an NVM Express status code 101157dacad5SJay Sternberg */ 101257dacad5SJay Sternberg int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 101357dacad5SJay Sternberg void *buffer, void __user *ubuffer, unsigned bufflen, 101457dacad5SJay Sternberg u32 *result, unsigned timeout) 101557dacad5SJay Sternberg { 101657dacad5SJay Sternberg bool write = cmd->common.opcode & 1; 101757dacad5SJay Sternberg struct bio *bio = NULL; 101857dacad5SJay Sternberg struct request *req; 101957dacad5SJay Sternberg int ret; 102057dacad5SJay Sternberg 102157dacad5SJay Sternberg req = blk_mq_alloc_request(q, write, GFP_KERNEL, false); 102257dacad5SJay Sternberg if (IS_ERR(req)) 102357dacad5SJay Sternberg return PTR_ERR(req); 102457dacad5SJay Sternberg 102557dacad5SJay Sternberg req->cmd_type = REQ_TYPE_DRV_PRIV; 102657dacad5SJay Sternberg req->cmd_flags |= REQ_FAILFAST_DRIVER; 102757dacad5SJay Sternberg req->__data_len = 0; 102857dacad5SJay Sternberg req->__sector = (sector_t) -1; 102957dacad5SJay Sternberg req->bio = req->biotail = NULL; 103057dacad5SJay Sternberg 103157dacad5SJay Sternberg req->timeout = timeout ? timeout : ADMIN_TIMEOUT; 103257dacad5SJay Sternberg 103357dacad5SJay Sternberg req->cmd = (unsigned char *)cmd; 103457dacad5SJay Sternberg req->cmd_len = sizeof(struct nvme_command); 103557dacad5SJay Sternberg req->special = (void *)0; 103657dacad5SJay Sternberg 103757dacad5SJay Sternberg if (buffer && bufflen) { 103857dacad5SJay Sternberg ret = blk_rq_map_kern(q, req, buffer, bufflen, __GFP_WAIT); 103957dacad5SJay Sternberg if (ret) 104057dacad5SJay Sternberg goto out; 104157dacad5SJay Sternberg } else if (ubuffer && bufflen) { 104257dacad5SJay Sternberg ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, __GFP_WAIT); 104357dacad5SJay Sternberg if (ret) 104457dacad5SJay Sternberg goto out; 104557dacad5SJay Sternberg bio = req->bio; 104657dacad5SJay Sternberg } 104757dacad5SJay Sternberg 104857dacad5SJay Sternberg blk_execute_rq(req->q, NULL, req, 0); 104957dacad5SJay Sternberg if (bio) 105057dacad5SJay Sternberg blk_rq_unmap_user(bio); 105157dacad5SJay Sternberg if (result) 105257dacad5SJay Sternberg *result = (u32)(uintptr_t)req->special; 105357dacad5SJay Sternberg ret = req->errors; 105457dacad5SJay Sternberg out: 105557dacad5SJay Sternberg blk_mq_free_request(req); 105657dacad5SJay Sternberg return ret; 105757dacad5SJay Sternberg } 105857dacad5SJay Sternberg 105957dacad5SJay Sternberg int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, 106057dacad5SJay Sternberg void *buffer, unsigned bufflen) 106157dacad5SJay Sternberg { 106257dacad5SJay Sternberg return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen, NULL, 0); 106357dacad5SJay Sternberg } 106457dacad5SJay Sternberg 106557dacad5SJay Sternberg static int nvme_submit_async_admin_req(struct nvme_dev *dev) 106657dacad5SJay Sternberg { 106757dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 106857dacad5SJay Sternberg struct nvme_command c; 106957dacad5SJay Sternberg struct nvme_cmd_info *cmd_info; 107057dacad5SJay Sternberg struct request *req; 107157dacad5SJay Sternberg 107257dacad5SJay Sternberg req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC, true); 107357dacad5SJay Sternberg if (IS_ERR(req)) 107457dacad5SJay Sternberg return PTR_ERR(req); 107557dacad5SJay Sternberg 107657dacad5SJay Sternberg req->cmd_flags |= REQ_NO_TIMEOUT; 107757dacad5SJay Sternberg cmd_info = blk_mq_rq_to_pdu(req); 107857dacad5SJay Sternberg nvme_set_info(cmd_info, NULL, async_req_completion); 107957dacad5SJay Sternberg 108057dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 108157dacad5SJay Sternberg c.common.opcode = nvme_admin_async_event; 108257dacad5SJay Sternberg c.common.command_id = req->tag; 108357dacad5SJay Sternberg 108457dacad5SJay Sternberg blk_mq_free_request(req); 108557dacad5SJay Sternberg __nvme_submit_cmd(nvmeq, &c); 108657dacad5SJay Sternberg return 0; 108757dacad5SJay Sternberg } 108857dacad5SJay Sternberg 108957dacad5SJay Sternberg static int nvme_submit_admin_async_cmd(struct nvme_dev *dev, 109057dacad5SJay Sternberg struct nvme_command *cmd, 109157dacad5SJay Sternberg struct async_cmd_info *cmdinfo, unsigned timeout) 109257dacad5SJay Sternberg { 109357dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[0]; 109457dacad5SJay Sternberg struct request *req; 109557dacad5SJay Sternberg struct nvme_cmd_info *cmd_rq; 109657dacad5SJay Sternberg 109757dacad5SJay Sternberg req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_KERNEL, false); 109857dacad5SJay Sternberg if (IS_ERR(req)) 109957dacad5SJay Sternberg return PTR_ERR(req); 110057dacad5SJay Sternberg 110157dacad5SJay Sternberg req->timeout = timeout; 110257dacad5SJay Sternberg cmd_rq = blk_mq_rq_to_pdu(req); 110357dacad5SJay Sternberg cmdinfo->req = req; 110457dacad5SJay Sternberg nvme_set_info(cmd_rq, cmdinfo, async_completion); 110557dacad5SJay Sternberg cmdinfo->status = -EINTR; 110657dacad5SJay Sternberg 110757dacad5SJay Sternberg cmd->common.command_id = req->tag; 110857dacad5SJay Sternberg 110957dacad5SJay Sternberg nvme_submit_cmd(nvmeq, cmd); 111057dacad5SJay Sternberg return 0; 111157dacad5SJay Sternberg } 111257dacad5SJay Sternberg 111357dacad5SJay Sternberg static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) 111457dacad5SJay Sternberg { 111557dacad5SJay Sternberg struct nvme_command c; 111657dacad5SJay Sternberg 111757dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 111857dacad5SJay Sternberg c.delete_queue.opcode = opcode; 111957dacad5SJay Sternberg c.delete_queue.qid = cpu_to_le16(id); 112057dacad5SJay Sternberg 112157dacad5SJay Sternberg return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0); 112257dacad5SJay Sternberg } 112357dacad5SJay Sternberg 112457dacad5SJay Sternberg static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, 112557dacad5SJay Sternberg struct nvme_queue *nvmeq) 112657dacad5SJay Sternberg { 112757dacad5SJay Sternberg struct nvme_command c; 112857dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; 112957dacad5SJay Sternberg 113057dacad5SJay Sternberg /* 113157dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 113257dacad5SJay Sternberg * is attached to the request. 113357dacad5SJay Sternberg */ 113457dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 113557dacad5SJay Sternberg c.create_cq.opcode = nvme_admin_create_cq; 113657dacad5SJay Sternberg c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); 113757dacad5SJay Sternberg c.create_cq.cqid = cpu_to_le16(qid); 113857dacad5SJay Sternberg c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 113957dacad5SJay Sternberg c.create_cq.cq_flags = cpu_to_le16(flags); 114057dacad5SJay Sternberg c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); 114157dacad5SJay Sternberg 114257dacad5SJay Sternberg return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0); 114357dacad5SJay Sternberg } 114457dacad5SJay Sternberg 114557dacad5SJay Sternberg static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, 114657dacad5SJay Sternberg struct nvme_queue *nvmeq) 114757dacad5SJay Sternberg { 114857dacad5SJay Sternberg struct nvme_command c; 114957dacad5SJay Sternberg int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; 115057dacad5SJay Sternberg 115157dacad5SJay Sternberg /* 115257dacad5SJay Sternberg * Note: we (ab)use the fact the the prp fields survive if no data 115357dacad5SJay Sternberg * is attached to the request. 115457dacad5SJay Sternberg */ 115557dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 115657dacad5SJay Sternberg c.create_sq.opcode = nvme_admin_create_sq; 115757dacad5SJay Sternberg c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); 115857dacad5SJay Sternberg c.create_sq.sqid = cpu_to_le16(qid); 115957dacad5SJay Sternberg c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); 116057dacad5SJay Sternberg c.create_sq.sq_flags = cpu_to_le16(flags); 116157dacad5SJay Sternberg c.create_sq.cqid = cpu_to_le16(qid); 116257dacad5SJay Sternberg 116357dacad5SJay Sternberg return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0); 116457dacad5SJay Sternberg } 116557dacad5SJay Sternberg 116657dacad5SJay Sternberg static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) 116757dacad5SJay Sternberg { 116857dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); 116957dacad5SJay Sternberg } 117057dacad5SJay Sternberg 117157dacad5SJay Sternberg static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) 117257dacad5SJay Sternberg { 117357dacad5SJay Sternberg return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); 117457dacad5SJay Sternberg } 117557dacad5SJay Sternberg 117657dacad5SJay Sternberg int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id) 117757dacad5SJay Sternberg { 117857dacad5SJay Sternberg struct nvme_command c = { }; 117957dacad5SJay Sternberg int error; 118057dacad5SJay Sternberg 118157dacad5SJay Sternberg /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ 118257dacad5SJay Sternberg c.identify.opcode = nvme_admin_identify; 118357dacad5SJay Sternberg c.identify.cns = cpu_to_le32(1); 118457dacad5SJay Sternberg 118557dacad5SJay Sternberg *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); 118657dacad5SJay Sternberg if (!*id) 118757dacad5SJay Sternberg return -ENOMEM; 118857dacad5SJay Sternberg 118957dacad5SJay Sternberg error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, 119057dacad5SJay Sternberg sizeof(struct nvme_id_ctrl)); 119157dacad5SJay Sternberg if (error) 119257dacad5SJay Sternberg kfree(*id); 119357dacad5SJay Sternberg return error; 119457dacad5SJay Sternberg } 119557dacad5SJay Sternberg 119657dacad5SJay Sternberg int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid, 119757dacad5SJay Sternberg struct nvme_id_ns **id) 119857dacad5SJay Sternberg { 119957dacad5SJay Sternberg struct nvme_command c = { }; 120057dacad5SJay Sternberg int error; 120157dacad5SJay Sternberg 120257dacad5SJay Sternberg /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ 120357dacad5SJay Sternberg c.identify.opcode = nvme_admin_identify, 120457dacad5SJay Sternberg c.identify.nsid = cpu_to_le32(nsid), 120557dacad5SJay Sternberg 120657dacad5SJay Sternberg *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); 120757dacad5SJay Sternberg if (!*id) 120857dacad5SJay Sternberg return -ENOMEM; 120957dacad5SJay Sternberg 121057dacad5SJay Sternberg error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, 121157dacad5SJay Sternberg sizeof(struct nvme_id_ns)); 121257dacad5SJay Sternberg if (error) 121357dacad5SJay Sternberg kfree(*id); 121457dacad5SJay Sternberg return error; 121557dacad5SJay Sternberg } 121657dacad5SJay Sternberg 121757dacad5SJay Sternberg int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, 121857dacad5SJay Sternberg dma_addr_t dma_addr, u32 *result) 121957dacad5SJay Sternberg { 122057dacad5SJay Sternberg struct nvme_command c; 122157dacad5SJay Sternberg 122257dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 122357dacad5SJay Sternberg c.features.opcode = nvme_admin_get_features; 122457dacad5SJay Sternberg c.features.nsid = cpu_to_le32(nsid); 122557dacad5SJay Sternberg c.features.prp1 = cpu_to_le64(dma_addr); 122657dacad5SJay Sternberg c.features.fid = cpu_to_le32(fid); 122757dacad5SJay Sternberg 122857dacad5SJay Sternberg return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0, 122957dacad5SJay Sternberg result, 0); 123057dacad5SJay Sternberg } 123157dacad5SJay Sternberg 123257dacad5SJay Sternberg int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, 123357dacad5SJay Sternberg dma_addr_t dma_addr, u32 *result) 123457dacad5SJay Sternberg { 123557dacad5SJay Sternberg struct nvme_command c; 123657dacad5SJay Sternberg 123757dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 123857dacad5SJay Sternberg c.features.opcode = nvme_admin_set_features; 123957dacad5SJay Sternberg c.features.prp1 = cpu_to_le64(dma_addr); 124057dacad5SJay Sternberg c.features.fid = cpu_to_le32(fid); 124157dacad5SJay Sternberg c.features.dword11 = cpu_to_le32(dword11); 124257dacad5SJay Sternberg 124357dacad5SJay Sternberg return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0, 124457dacad5SJay Sternberg result, 0); 124557dacad5SJay Sternberg } 124657dacad5SJay Sternberg 124757dacad5SJay Sternberg int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log) 124857dacad5SJay Sternberg { 124957dacad5SJay Sternberg struct nvme_command c = { }; 125057dacad5SJay Sternberg int error; 125157dacad5SJay Sternberg 125257dacad5SJay Sternberg c.common.opcode = nvme_admin_get_log_page, 125357dacad5SJay Sternberg c.common.nsid = cpu_to_le32(0xFFFFFFFF), 125457dacad5SJay Sternberg c.common.cdw10[0] = cpu_to_le32( 125557dacad5SJay Sternberg (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | 125657dacad5SJay Sternberg NVME_LOG_SMART), 125757dacad5SJay Sternberg 125857dacad5SJay Sternberg *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); 125957dacad5SJay Sternberg if (!*log) 126057dacad5SJay Sternberg return -ENOMEM; 126157dacad5SJay Sternberg 126257dacad5SJay Sternberg error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, 126357dacad5SJay Sternberg sizeof(struct nvme_smart_log)); 126457dacad5SJay Sternberg if (error) 126557dacad5SJay Sternberg kfree(*log); 126657dacad5SJay Sternberg return error; 126757dacad5SJay Sternberg } 126857dacad5SJay Sternberg 126957dacad5SJay Sternberg /** 127057dacad5SJay Sternberg * nvme_abort_req - Attempt aborting a request 127157dacad5SJay Sternberg * 127257dacad5SJay Sternberg * Schedule controller reset if the command was already aborted once before and 127357dacad5SJay Sternberg * still hasn't been returned to the driver, or if this is the admin queue. 127457dacad5SJay Sternberg */ 127557dacad5SJay Sternberg static void nvme_abort_req(struct request *req) 127657dacad5SJay Sternberg { 127757dacad5SJay Sternberg struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); 127857dacad5SJay Sternberg struct nvme_queue *nvmeq = cmd_rq->nvmeq; 127957dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 128057dacad5SJay Sternberg struct request *abort_req; 128157dacad5SJay Sternberg struct nvme_cmd_info *abort_cmd; 128257dacad5SJay Sternberg struct nvme_command cmd; 128357dacad5SJay Sternberg 128457dacad5SJay Sternberg if (!nvmeq->qid || cmd_rq->aborted) { 128557dacad5SJay Sternberg spin_lock(&dev_list_lock); 128657dacad5SJay Sternberg if (!__nvme_reset(dev)) { 128757dacad5SJay Sternberg dev_warn(dev->dev, 128857dacad5SJay Sternberg "I/O %d QID %d timeout, reset controller\n", 128957dacad5SJay Sternberg req->tag, nvmeq->qid); 129057dacad5SJay Sternberg } 129157dacad5SJay Sternberg spin_unlock(&dev_list_lock); 129257dacad5SJay Sternberg return; 129357dacad5SJay Sternberg } 129457dacad5SJay Sternberg 129557dacad5SJay Sternberg if (!dev->abort_limit) 129657dacad5SJay Sternberg return; 129757dacad5SJay Sternberg 129857dacad5SJay Sternberg abort_req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC, 129957dacad5SJay Sternberg false); 130057dacad5SJay Sternberg if (IS_ERR(abort_req)) 130157dacad5SJay Sternberg return; 130257dacad5SJay Sternberg 130357dacad5SJay Sternberg abort_cmd = blk_mq_rq_to_pdu(abort_req); 130457dacad5SJay Sternberg nvme_set_info(abort_cmd, abort_req, abort_completion); 130557dacad5SJay Sternberg 130657dacad5SJay Sternberg memset(&cmd, 0, sizeof(cmd)); 130757dacad5SJay Sternberg cmd.abort.opcode = nvme_admin_abort_cmd; 130857dacad5SJay Sternberg cmd.abort.cid = req->tag; 130957dacad5SJay Sternberg cmd.abort.sqid = cpu_to_le16(nvmeq->qid); 131057dacad5SJay Sternberg cmd.abort.command_id = abort_req->tag; 131157dacad5SJay Sternberg 131257dacad5SJay Sternberg --dev->abort_limit; 131357dacad5SJay Sternberg cmd_rq->aborted = 1; 131457dacad5SJay Sternberg 131557dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", req->tag, 131657dacad5SJay Sternberg nvmeq->qid); 131757dacad5SJay Sternberg nvme_submit_cmd(dev->queues[0], &cmd); 131857dacad5SJay Sternberg } 131957dacad5SJay Sternberg 132057dacad5SJay Sternberg static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved) 132157dacad5SJay Sternberg { 132257dacad5SJay Sternberg struct nvme_queue *nvmeq = data; 132357dacad5SJay Sternberg void *ctx; 132457dacad5SJay Sternberg nvme_completion_fn fn; 132557dacad5SJay Sternberg struct nvme_cmd_info *cmd; 132657dacad5SJay Sternberg struct nvme_completion cqe; 132757dacad5SJay Sternberg 132857dacad5SJay Sternberg if (!blk_mq_request_started(req)) 132957dacad5SJay Sternberg return; 133057dacad5SJay Sternberg 133157dacad5SJay Sternberg cmd = blk_mq_rq_to_pdu(req); 133257dacad5SJay Sternberg 133357dacad5SJay Sternberg if (cmd->ctx == CMD_CTX_CANCELLED) 133457dacad5SJay Sternberg return; 133557dacad5SJay Sternberg 133657dacad5SJay Sternberg if (blk_queue_dying(req->q)) 133757dacad5SJay Sternberg cqe.status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1); 133857dacad5SJay Sternberg else 133957dacad5SJay Sternberg cqe.status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); 134057dacad5SJay Sternberg 134157dacad5SJay Sternberg 134257dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n", 134357dacad5SJay Sternberg req->tag, nvmeq->qid); 134457dacad5SJay Sternberg ctx = cancel_cmd_info(cmd, &fn); 134557dacad5SJay Sternberg fn(nvmeq, ctx, &cqe); 134657dacad5SJay Sternberg } 134757dacad5SJay Sternberg 134857dacad5SJay Sternberg static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) 134957dacad5SJay Sternberg { 135057dacad5SJay Sternberg struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); 135157dacad5SJay Sternberg struct nvme_queue *nvmeq = cmd->nvmeq; 135257dacad5SJay Sternberg 135357dacad5SJay Sternberg dev_warn(nvmeq->q_dmadev, "Timeout I/O %d QID %d\n", req->tag, 135457dacad5SJay Sternberg nvmeq->qid); 135557dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 135657dacad5SJay Sternberg nvme_abort_req(req); 135757dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 135857dacad5SJay Sternberg 135957dacad5SJay Sternberg /* 136057dacad5SJay Sternberg * The aborted req will be completed on receiving the abort req. 136157dacad5SJay Sternberg * We enable the timer again. If hit twice, it'll cause a device reset, 136257dacad5SJay Sternberg * as the device then is in a faulty state. 136357dacad5SJay Sternberg */ 136457dacad5SJay Sternberg return BLK_EH_RESET_TIMER; 136557dacad5SJay Sternberg } 136657dacad5SJay Sternberg 136757dacad5SJay Sternberg static void nvme_free_queue(struct nvme_queue *nvmeq) 136857dacad5SJay Sternberg { 136957dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), 137057dacad5SJay Sternberg (void *)nvmeq->cqes, nvmeq->cq_dma_addr); 137157dacad5SJay Sternberg if (nvmeq->sq_cmds) 137257dacad5SJay Sternberg dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), 137357dacad5SJay Sternberg nvmeq->sq_cmds, nvmeq->sq_dma_addr); 137457dacad5SJay Sternberg kfree(nvmeq); 137557dacad5SJay Sternberg } 137657dacad5SJay Sternberg 137757dacad5SJay Sternberg static void nvme_free_queues(struct nvme_dev *dev, int lowest) 137857dacad5SJay Sternberg { 137957dacad5SJay Sternberg int i; 138057dacad5SJay Sternberg 138157dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= lowest; i--) { 138257dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 138357dacad5SJay Sternberg dev->queue_count--; 138457dacad5SJay Sternberg dev->queues[i] = NULL; 138557dacad5SJay Sternberg nvme_free_queue(nvmeq); 138657dacad5SJay Sternberg } 138757dacad5SJay Sternberg } 138857dacad5SJay Sternberg 138957dacad5SJay Sternberg /** 139057dacad5SJay Sternberg * nvme_suspend_queue - put queue into suspended state 139157dacad5SJay Sternberg * @nvmeq - queue to suspend 139257dacad5SJay Sternberg */ 139357dacad5SJay Sternberg static int nvme_suspend_queue(struct nvme_queue *nvmeq) 139457dacad5SJay Sternberg { 139557dacad5SJay Sternberg int vector; 139657dacad5SJay Sternberg 139757dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 139857dacad5SJay Sternberg if (nvmeq->cq_vector == -1) { 139957dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 140057dacad5SJay Sternberg return 1; 140157dacad5SJay Sternberg } 140257dacad5SJay Sternberg vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; 140357dacad5SJay Sternberg nvmeq->dev->online_queues--; 140457dacad5SJay Sternberg nvmeq->cq_vector = -1; 140557dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 140657dacad5SJay Sternberg 140757dacad5SJay Sternberg if (!nvmeq->qid && nvmeq->dev->admin_q) 140857dacad5SJay Sternberg blk_mq_freeze_queue_start(nvmeq->dev->admin_q); 140957dacad5SJay Sternberg 141057dacad5SJay Sternberg irq_set_affinity_hint(vector, NULL); 141157dacad5SJay Sternberg free_irq(vector, nvmeq); 141257dacad5SJay Sternberg 141357dacad5SJay Sternberg return 0; 141457dacad5SJay Sternberg } 141557dacad5SJay Sternberg 141657dacad5SJay Sternberg static void nvme_clear_queue(struct nvme_queue *nvmeq) 141757dacad5SJay Sternberg { 141857dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 141957dacad5SJay Sternberg if (nvmeq->tags && *nvmeq->tags) 142057dacad5SJay Sternberg blk_mq_all_tag_busy_iter(*nvmeq->tags, nvme_cancel_queue_ios, nvmeq); 142157dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 142257dacad5SJay Sternberg } 142357dacad5SJay Sternberg 142457dacad5SJay Sternberg static void nvme_disable_queue(struct nvme_dev *dev, int qid) 142557dacad5SJay Sternberg { 142657dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[qid]; 142757dacad5SJay Sternberg 142857dacad5SJay Sternberg if (!nvmeq) 142957dacad5SJay Sternberg return; 143057dacad5SJay Sternberg if (nvme_suspend_queue(nvmeq)) 143157dacad5SJay Sternberg return; 143257dacad5SJay Sternberg 143357dacad5SJay Sternberg /* Don't tell the adapter to delete the admin queue. 143457dacad5SJay Sternberg * Don't tell a removed adapter to delete IO queues. */ 143557dacad5SJay Sternberg if (qid && readl(&dev->bar->csts) != -1) { 143657dacad5SJay Sternberg adapter_delete_sq(dev, qid); 143757dacad5SJay Sternberg adapter_delete_cq(dev, qid); 143857dacad5SJay Sternberg } 143957dacad5SJay Sternberg 144057dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 144157dacad5SJay Sternberg nvme_process_cq(nvmeq); 144257dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 144357dacad5SJay Sternberg } 144457dacad5SJay Sternberg 144557dacad5SJay Sternberg static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, 144657dacad5SJay Sternberg int entry_size) 144757dacad5SJay Sternberg { 144857dacad5SJay Sternberg int q_depth = dev->q_depth; 144957dacad5SJay Sternberg unsigned q_size_aligned = roundup(q_depth * entry_size, dev->page_size); 145057dacad5SJay Sternberg 145157dacad5SJay Sternberg if (q_size_aligned * nr_io_queues > dev->cmb_size) { 145257dacad5SJay Sternberg u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); 145357dacad5SJay Sternberg mem_per_q = round_down(mem_per_q, dev->page_size); 145457dacad5SJay Sternberg q_depth = div_u64(mem_per_q, entry_size); 145557dacad5SJay Sternberg 145657dacad5SJay Sternberg /* 145757dacad5SJay Sternberg * Ensure the reduced q_depth is above some threshold where it 145857dacad5SJay Sternberg * would be better to map queues in system memory with the 145957dacad5SJay Sternberg * original depth 146057dacad5SJay Sternberg */ 146157dacad5SJay Sternberg if (q_depth < 64) 146257dacad5SJay Sternberg return -ENOMEM; 146357dacad5SJay Sternberg } 146457dacad5SJay Sternberg 146557dacad5SJay Sternberg return q_depth; 146657dacad5SJay Sternberg } 146757dacad5SJay Sternberg 146857dacad5SJay Sternberg static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, 146957dacad5SJay Sternberg int qid, int depth) 147057dacad5SJay Sternberg { 147157dacad5SJay Sternberg if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { 147257dacad5SJay Sternberg unsigned offset = (qid - 1) * 147357dacad5SJay Sternberg roundup(SQ_SIZE(depth), dev->page_size); 147457dacad5SJay Sternberg nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; 147557dacad5SJay Sternberg nvmeq->sq_cmds_io = dev->cmb + offset; 147657dacad5SJay Sternberg } else { 147757dacad5SJay Sternberg nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), 147857dacad5SJay Sternberg &nvmeq->sq_dma_addr, GFP_KERNEL); 147957dacad5SJay Sternberg if (!nvmeq->sq_cmds) 148057dacad5SJay Sternberg return -ENOMEM; 148157dacad5SJay Sternberg } 148257dacad5SJay Sternberg 148357dacad5SJay Sternberg return 0; 148457dacad5SJay Sternberg } 148557dacad5SJay Sternberg 148657dacad5SJay Sternberg static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, 148757dacad5SJay Sternberg int depth) 148857dacad5SJay Sternberg { 148957dacad5SJay Sternberg struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL); 149057dacad5SJay Sternberg if (!nvmeq) 149157dacad5SJay Sternberg return NULL; 149257dacad5SJay Sternberg 149357dacad5SJay Sternberg nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), 149457dacad5SJay Sternberg &nvmeq->cq_dma_addr, GFP_KERNEL); 149557dacad5SJay Sternberg if (!nvmeq->cqes) 149657dacad5SJay Sternberg goto free_nvmeq; 149757dacad5SJay Sternberg 149857dacad5SJay Sternberg if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) 149957dacad5SJay Sternberg goto free_cqdma; 150057dacad5SJay Sternberg 150157dacad5SJay Sternberg nvmeq->q_dmadev = dev->dev; 150257dacad5SJay Sternberg nvmeq->dev = dev; 150357dacad5SJay Sternberg snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", 150457dacad5SJay Sternberg dev->instance, qid); 150557dacad5SJay Sternberg spin_lock_init(&nvmeq->q_lock); 150657dacad5SJay Sternberg nvmeq->cq_head = 0; 150757dacad5SJay Sternberg nvmeq->cq_phase = 1; 150857dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 150957dacad5SJay Sternberg nvmeq->q_depth = depth; 151057dacad5SJay Sternberg nvmeq->qid = qid; 151157dacad5SJay Sternberg nvmeq->cq_vector = -1; 151257dacad5SJay Sternberg dev->queues[qid] = nvmeq; 151357dacad5SJay Sternberg 151457dacad5SJay Sternberg /* make sure queue descriptor is set before queue count, for kthread */ 151557dacad5SJay Sternberg mb(); 151657dacad5SJay Sternberg dev->queue_count++; 151757dacad5SJay Sternberg 151857dacad5SJay Sternberg return nvmeq; 151957dacad5SJay Sternberg 152057dacad5SJay Sternberg free_cqdma: 152157dacad5SJay Sternberg dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, 152257dacad5SJay Sternberg nvmeq->cq_dma_addr); 152357dacad5SJay Sternberg free_nvmeq: 152457dacad5SJay Sternberg kfree(nvmeq); 152557dacad5SJay Sternberg return NULL; 152657dacad5SJay Sternberg } 152757dacad5SJay Sternberg 152857dacad5SJay Sternberg static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, 152957dacad5SJay Sternberg const char *name) 153057dacad5SJay Sternberg { 153157dacad5SJay Sternberg if (use_threaded_interrupts) 153257dacad5SJay Sternberg return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, 153357dacad5SJay Sternberg nvme_irq_check, nvme_irq, IRQF_SHARED, 153457dacad5SJay Sternberg name, nvmeq); 153557dacad5SJay Sternberg return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, 153657dacad5SJay Sternberg IRQF_SHARED, name, nvmeq); 153757dacad5SJay Sternberg } 153857dacad5SJay Sternberg 153957dacad5SJay Sternberg static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) 154057dacad5SJay Sternberg { 154157dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 154257dacad5SJay Sternberg 154357dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 154457dacad5SJay Sternberg nvmeq->sq_tail = 0; 154557dacad5SJay Sternberg nvmeq->cq_head = 0; 154657dacad5SJay Sternberg nvmeq->cq_phase = 1; 154757dacad5SJay Sternberg nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; 154857dacad5SJay Sternberg memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); 154957dacad5SJay Sternberg dev->online_queues++; 155057dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 155157dacad5SJay Sternberg } 155257dacad5SJay Sternberg 155357dacad5SJay Sternberg static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) 155457dacad5SJay Sternberg { 155557dacad5SJay Sternberg struct nvme_dev *dev = nvmeq->dev; 155657dacad5SJay Sternberg int result; 155757dacad5SJay Sternberg 155857dacad5SJay Sternberg nvmeq->cq_vector = qid - 1; 155957dacad5SJay Sternberg result = adapter_alloc_cq(dev, qid, nvmeq); 156057dacad5SJay Sternberg if (result < 0) 156157dacad5SJay Sternberg return result; 156257dacad5SJay Sternberg 156357dacad5SJay Sternberg result = adapter_alloc_sq(dev, qid, nvmeq); 156457dacad5SJay Sternberg if (result < 0) 156557dacad5SJay Sternberg goto release_cq; 156657dacad5SJay Sternberg 156757dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 156857dacad5SJay Sternberg if (result < 0) 156957dacad5SJay Sternberg goto release_sq; 157057dacad5SJay Sternberg 157157dacad5SJay Sternberg nvme_init_queue(nvmeq, qid); 157257dacad5SJay Sternberg return result; 157357dacad5SJay Sternberg 157457dacad5SJay Sternberg release_sq: 157557dacad5SJay Sternberg adapter_delete_sq(dev, qid); 157657dacad5SJay Sternberg release_cq: 157757dacad5SJay Sternberg adapter_delete_cq(dev, qid); 157857dacad5SJay Sternberg return result; 157957dacad5SJay Sternberg } 158057dacad5SJay Sternberg 158157dacad5SJay Sternberg static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled) 158257dacad5SJay Sternberg { 158357dacad5SJay Sternberg unsigned long timeout; 158457dacad5SJay Sternberg u32 bit = enabled ? NVME_CSTS_RDY : 0; 158557dacad5SJay Sternberg 158657dacad5SJay Sternberg timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; 158757dacad5SJay Sternberg 158857dacad5SJay Sternberg while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) { 158957dacad5SJay Sternberg msleep(100); 159057dacad5SJay Sternberg if (fatal_signal_pending(current)) 159157dacad5SJay Sternberg return -EINTR; 159257dacad5SJay Sternberg if (time_after(jiffies, timeout)) { 159357dacad5SJay Sternberg dev_err(dev->dev, 159457dacad5SJay Sternberg "Device not ready; aborting %s\n", enabled ? 159557dacad5SJay Sternberg "initialisation" : "reset"); 159657dacad5SJay Sternberg return -ENODEV; 159757dacad5SJay Sternberg } 159857dacad5SJay Sternberg } 159957dacad5SJay Sternberg 160057dacad5SJay Sternberg return 0; 160157dacad5SJay Sternberg } 160257dacad5SJay Sternberg 160357dacad5SJay Sternberg /* 160457dacad5SJay Sternberg * If the device has been passed off to us in an enabled state, just clear 160557dacad5SJay Sternberg * the enabled bit. The spec says we should set the 'shutdown notification 160657dacad5SJay Sternberg * bits', but doing so may cause the device to complete commands to the 160757dacad5SJay Sternberg * admin queue ... and we don't know what memory that might be pointing at! 160857dacad5SJay Sternberg */ 160957dacad5SJay Sternberg static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap) 161057dacad5SJay Sternberg { 161157dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_SHN_MASK; 161257dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_ENABLE; 161357dacad5SJay Sternberg writel(dev->ctrl_config, &dev->bar->cc); 161457dacad5SJay Sternberg 161557dacad5SJay Sternberg return nvme_wait_ready(dev, cap, false); 161657dacad5SJay Sternberg } 161757dacad5SJay Sternberg 161857dacad5SJay Sternberg static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap) 161957dacad5SJay Sternberg { 162057dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_SHN_MASK; 162157dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_ENABLE; 162257dacad5SJay Sternberg writel(dev->ctrl_config, &dev->bar->cc); 162357dacad5SJay Sternberg 162457dacad5SJay Sternberg return nvme_wait_ready(dev, cap, true); 162557dacad5SJay Sternberg } 162657dacad5SJay Sternberg 162757dacad5SJay Sternberg static int nvme_shutdown_ctrl(struct nvme_dev *dev) 162857dacad5SJay Sternberg { 162957dacad5SJay Sternberg unsigned long timeout; 163057dacad5SJay Sternberg 163157dacad5SJay Sternberg dev->ctrl_config &= ~NVME_CC_SHN_MASK; 163257dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_SHN_NORMAL; 163357dacad5SJay Sternberg 163457dacad5SJay Sternberg writel(dev->ctrl_config, &dev->bar->cc); 163557dacad5SJay Sternberg 163657dacad5SJay Sternberg timeout = SHUTDOWN_TIMEOUT + jiffies; 163757dacad5SJay Sternberg while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) != 163857dacad5SJay Sternberg NVME_CSTS_SHST_CMPLT) { 163957dacad5SJay Sternberg msleep(100); 164057dacad5SJay Sternberg if (fatal_signal_pending(current)) 164157dacad5SJay Sternberg return -EINTR; 164257dacad5SJay Sternberg if (time_after(jiffies, timeout)) { 164357dacad5SJay Sternberg dev_err(dev->dev, 164457dacad5SJay Sternberg "Device shutdown incomplete; abort shutdown\n"); 164557dacad5SJay Sternberg return -ENODEV; 164657dacad5SJay Sternberg } 164757dacad5SJay Sternberg } 164857dacad5SJay Sternberg 164957dacad5SJay Sternberg return 0; 165057dacad5SJay Sternberg } 165157dacad5SJay Sternberg 165257dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_admin_ops = { 165357dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 165457dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 165557dacad5SJay Sternberg .init_hctx = nvme_admin_init_hctx, 165657dacad5SJay Sternberg .exit_hctx = nvme_admin_exit_hctx, 165757dacad5SJay Sternberg .init_request = nvme_admin_init_request, 165857dacad5SJay Sternberg .timeout = nvme_timeout, 165957dacad5SJay Sternberg }; 166057dacad5SJay Sternberg 166157dacad5SJay Sternberg static struct blk_mq_ops nvme_mq_ops = { 166257dacad5SJay Sternberg .queue_rq = nvme_queue_rq, 166357dacad5SJay Sternberg .map_queue = blk_mq_map_queue, 166457dacad5SJay Sternberg .init_hctx = nvme_init_hctx, 166557dacad5SJay Sternberg .init_request = nvme_init_request, 166657dacad5SJay Sternberg .timeout = nvme_timeout, 166757dacad5SJay Sternberg }; 166857dacad5SJay Sternberg 166957dacad5SJay Sternberg static void nvme_dev_remove_admin(struct nvme_dev *dev) 167057dacad5SJay Sternberg { 167157dacad5SJay Sternberg if (dev->admin_q && !blk_queue_dying(dev->admin_q)) { 167257dacad5SJay Sternberg blk_cleanup_queue(dev->admin_q); 167357dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 167457dacad5SJay Sternberg } 167557dacad5SJay Sternberg } 167657dacad5SJay Sternberg 167757dacad5SJay Sternberg static int nvme_alloc_admin_tags(struct nvme_dev *dev) 167857dacad5SJay Sternberg { 167957dacad5SJay Sternberg if (!dev->admin_q) { 168057dacad5SJay Sternberg dev->admin_tagset.ops = &nvme_mq_admin_ops; 168157dacad5SJay Sternberg dev->admin_tagset.nr_hw_queues = 1; 168257dacad5SJay Sternberg dev->admin_tagset.queue_depth = NVME_AQ_DEPTH - 1; 168357dacad5SJay Sternberg dev->admin_tagset.reserved_tags = 1; 168457dacad5SJay Sternberg dev->admin_tagset.timeout = ADMIN_TIMEOUT; 168557dacad5SJay Sternberg dev->admin_tagset.numa_node = dev_to_node(dev->dev); 168657dacad5SJay Sternberg dev->admin_tagset.cmd_size = nvme_cmd_size(dev); 168757dacad5SJay Sternberg dev->admin_tagset.driver_data = dev; 168857dacad5SJay Sternberg 168957dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->admin_tagset)) 169057dacad5SJay Sternberg return -ENOMEM; 169157dacad5SJay Sternberg 169257dacad5SJay Sternberg dev->admin_q = blk_mq_init_queue(&dev->admin_tagset); 169357dacad5SJay Sternberg if (IS_ERR(dev->admin_q)) { 169457dacad5SJay Sternberg blk_mq_free_tag_set(&dev->admin_tagset); 169557dacad5SJay Sternberg return -ENOMEM; 169657dacad5SJay Sternberg } 169757dacad5SJay Sternberg if (!blk_get_queue(dev->admin_q)) { 169857dacad5SJay Sternberg nvme_dev_remove_admin(dev); 169957dacad5SJay Sternberg dev->admin_q = NULL; 170057dacad5SJay Sternberg return -ENODEV; 170157dacad5SJay Sternberg } 170257dacad5SJay Sternberg } else 170357dacad5SJay Sternberg blk_mq_unfreeze_queue(dev->admin_q); 170457dacad5SJay Sternberg 170557dacad5SJay Sternberg return 0; 170657dacad5SJay Sternberg } 170757dacad5SJay Sternberg 170857dacad5SJay Sternberg static int nvme_configure_admin_queue(struct nvme_dev *dev) 170957dacad5SJay Sternberg { 171057dacad5SJay Sternberg int result; 171157dacad5SJay Sternberg u32 aqa; 171257dacad5SJay Sternberg u64 cap = readq(&dev->bar->cap); 171357dacad5SJay Sternberg struct nvme_queue *nvmeq; 171457dacad5SJay Sternberg unsigned page_shift = PAGE_SHIFT; 171557dacad5SJay Sternberg unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12; 171657dacad5SJay Sternberg unsigned dev_page_max = NVME_CAP_MPSMAX(cap) + 12; 171757dacad5SJay Sternberg 171857dacad5SJay Sternberg if (page_shift < dev_page_min) { 171957dacad5SJay Sternberg dev_err(dev->dev, 172057dacad5SJay Sternberg "Minimum device page size (%u) too large for " 172157dacad5SJay Sternberg "host (%u)\n", 1 << dev_page_min, 172257dacad5SJay Sternberg 1 << page_shift); 172357dacad5SJay Sternberg return -ENODEV; 172457dacad5SJay Sternberg } 172557dacad5SJay Sternberg if (page_shift > dev_page_max) { 172657dacad5SJay Sternberg dev_info(dev->dev, 172757dacad5SJay Sternberg "Device maximum page size (%u) smaller than " 172857dacad5SJay Sternberg "host (%u); enabling work-around\n", 172957dacad5SJay Sternberg 1 << dev_page_max, 1 << page_shift); 173057dacad5SJay Sternberg page_shift = dev_page_max; 173157dacad5SJay Sternberg } 173257dacad5SJay Sternberg 173357dacad5SJay Sternberg dev->subsystem = readl(&dev->bar->vs) >= NVME_VS(1, 1) ? 173457dacad5SJay Sternberg NVME_CAP_NSSRC(cap) : 0; 173557dacad5SJay Sternberg 173657dacad5SJay Sternberg if (dev->subsystem && (readl(&dev->bar->csts) & NVME_CSTS_NSSRO)) 173757dacad5SJay Sternberg writel(NVME_CSTS_NSSRO, &dev->bar->csts); 173857dacad5SJay Sternberg 173957dacad5SJay Sternberg result = nvme_disable_ctrl(dev, cap); 174057dacad5SJay Sternberg if (result < 0) 174157dacad5SJay Sternberg return result; 174257dacad5SJay Sternberg 174357dacad5SJay Sternberg nvmeq = dev->queues[0]; 174457dacad5SJay Sternberg if (!nvmeq) { 174557dacad5SJay Sternberg nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); 174657dacad5SJay Sternberg if (!nvmeq) 174757dacad5SJay Sternberg return -ENOMEM; 174857dacad5SJay Sternberg } 174957dacad5SJay Sternberg 175057dacad5SJay Sternberg aqa = nvmeq->q_depth - 1; 175157dacad5SJay Sternberg aqa |= aqa << 16; 175257dacad5SJay Sternberg 175357dacad5SJay Sternberg dev->page_size = 1 << page_shift; 175457dacad5SJay Sternberg 175557dacad5SJay Sternberg dev->ctrl_config = NVME_CC_CSS_NVM; 175657dacad5SJay Sternberg dev->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; 175757dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; 175857dacad5SJay Sternberg dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; 175957dacad5SJay Sternberg 176057dacad5SJay Sternberg writel(aqa, &dev->bar->aqa); 176157dacad5SJay Sternberg writeq(nvmeq->sq_dma_addr, &dev->bar->asq); 176257dacad5SJay Sternberg writeq(nvmeq->cq_dma_addr, &dev->bar->acq); 176357dacad5SJay Sternberg 176457dacad5SJay Sternberg result = nvme_enable_ctrl(dev, cap); 176557dacad5SJay Sternberg if (result) 176657dacad5SJay Sternberg goto free_nvmeq; 176757dacad5SJay Sternberg 176857dacad5SJay Sternberg nvmeq->cq_vector = 0; 176957dacad5SJay Sternberg result = queue_request_irq(dev, nvmeq, nvmeq->irqname); 177057dacad5SJay Sternberg if (result) { 177157dacad5SJay Sternberg nvmeq->cq_vector = -1; 177257dacad5SJay Sternberg goto free_nvmeq; 177357dacad5SJay Sternberg } 177457dacad5SJay Sternberg 177557dacad5SJay Sternberg return result; 177657dacad5SJay Sternberg 177757dacad5SJay Sternberg free_nvmeq: 177857dacad5SJay Sternberg nvme_free_queues(dev, 0); 177957dacad5SJay Sternberg return result; 178057dacad5SJay Sternberg } 178157dacad5SJay Sternberg 178257dacad5SJay Sternberg static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) 178357dacad5SJay Sternberg { 178457dacad5SJay Sternberg struct nvme_dev *dev = ns->dev; 178557dacad5SJay Sternberg struct nvme_user_io io; 178657dacad5SJay Sternberg struct nvme_command c; 178757dacad5SJay Sternberg unsigned length, meta_len; 178857dacad5SJay Sternberg int status, write; 178957dacad5SJay Sternberg dma_addr_t meta_dma = 0; 179057dacad5SJay Sternberg void *meta = NULL; 179157dacad5SJay Sternberg void __user *metadata; 179257dacad5SJay Sternberg 179357dacad5SJay Sternberg if (copy_from_user(&io, uio, sizeof(io))) 179457dacad5SJay Sternberg return -EFAULT; 179557dacad5SJay Sternberg 179657dacad5SJay Sternberg switch (io.opcode) { 179757dacad5SJay Sternberg case nvme_cmd_write: 179857dacad5SJay Sternberg case nvme_cmd_read: 179957dacad5SJay Sternberg case nvme_cmd_compare: 180057dacad5SJay Sternberg break; 180157dacad5SJay Sternberg default: 180257dacad5SJay Sternberg return -EINVAL; 180357dacad5SJay Sternberg } 180457dacad5SJay Sternberg 180557dacad5SJay Sternberg length = (io.nblocks + 1) << ns->lba_shift; 180657dacad5SJay Sternberg meta_len = (io.nblocks + 1) * ns->ms; 18073d42e67fSArnd Bergmann metadata = (void __user *)(uintptr_t)io.metadata; 180857dacad5SJay Sternberg write = io.opcode & 1; 180957dacad5SJay Sternberg 181057dacad5SJay Sternberg if (ns->ext) { 181157dacad5SJay Sternberg length += meta_len; 181257dacad5SJay Sternberg meta_len = 0; 181357dacad5SJay Sternberg } 181457dacad5SJay Sternberg if (meta_len) { 181557dacad5SJay Sternberg if (((io.metadata & 3) || !io.metadata) && !ns->ext) 181657dacad5SJay Sternberg return -EINVAL; 181757dacad5SJay Sternberg 181857dacad5SJay Sternberg meta = dma_alloc_coherent(dev->dev, meta_len, 181957dacad5SJay Sternberg &meta_dma, GFP_KERNEL); 182057dacad5SJay Sternberg 182157dacad5SJay Sternberg if (!meta) { 182257dacad5SJay Sternberg status = -ENOMEM; 182357dacad5SJay Sternberg goto unmap; 182457dacad5SJay Sternberg } 182557dacad5SJay Sternberg if (write) { 182657dacad5SJay Sternberg if (copy_from_user(meta, metadata, meta_len)) { 182757dacad5SJay Sternberg status = -EFAULT; 182857dacad5SJay Sternberg goto unmap; 182957dacad5SJay Sternberg } 183057dacad5SJay Sternberg } 183157dacad5SJay Sternberg } 183257dacad5SJay Sternberg 183357dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 183457dacad5SJay Sternberg c.rw.opcode = io.opcode; 183557dacad5SJay Sternberg c.rw.flags = io.flags; 183657dacad5SJay Sternberg c.rw.nsid = cpu_to_le32(ns->ns_id); 183757dacad5SJay Sternberg c.rw.slba = cpu_to_le64(io.slba); 183857dacad5SJay Sternberg c.rw.length = cpu_to_le16(io.nblocks); 183957dacad5SJay Sternberg c.rw.control = cpu_to_le16(io.control); 184057dacad5SJay Sternberg c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); 184157dacad5SJay Sternberg c.rw.reftag = cpu_to_le32(io.reftag); 184257dacad5SJay Sternberg c.rw.apptag = cpu_to_le16(io.apptag); 184357dacad5SJay Sternberg c.rw.appmask = cpu_to_le16(io.appmask); 184457dacad5SJay Sternberg c.rw.metadata = cpu_to_le64(meta_dma); 184557dacad5SJay Sternberg 184657dacad5SJay Sternberg status = __nvme_submit_sync_cmd(ns->queue, &c, NULL, 18473d42e67fSArnd Bergmann (void __user *)(uintptr_t)io.addr, length, NULL, 0); 184857dacad5SJay Sternberg unmap: 184957dacad5SJay Sternberg if (meta) { 185057dacad5SJay Sternberg if (status == NVME_SC_SUCCESS && !write) { 185157dacad5SJay Sternberg if (copy_to_user(metadata, meta, meta_len)) 185257dacad5SJay Sternberg status = -EFAULT; 185357dacad5SJay Sternberg } 185457dacad5SJay Sternberg dma_free_coherent(dev->dev, meta_len, meta, meta_dma); 185557dacad5SJay Sternberg } 185657dacad5SJay Sternberg return status; 185757dacad5SJay Sternberg } 185857dacad5SJay Sternberg 185957dacad5SJay Sternberg static int nvme_user_cmd(struct nvme_dev *dev, struct nvme_ns *ns, 186057dacad5SJay Sternberg struct nvme_passthru_cmd __user *ucmd) 186157dacad5SJay Sternberg { 186257dacad5SJay Sternberg struct nvme_passthru_cmd cmd; 186357dacad5SJay Sternberg struct nvme_command c; 186457dacad5SJay Sternberg unsigned timeout = 0; 186557dacad5SJay Sternberg int status; 186657dacad5SJay Sternberg 186757dacad5SJay Sternberg if (!capable(CAP_SYS_ADMIN)) 186857dacad5SJay Sternberg return -EACCES; 186957dacad5SJay Sternberg if (copy_from_user(&cmd, ucmd, sizeof(cmd))) 187057dacad5SJay Sternberg return -EFAULT; 187157dacad5SJay Sternberg 187257dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 187357dacad5SJay Sternberg c.common.opcode = cmd.opcode; 187457dacad5SJay Sternberg c.common.flags = cmd.flags; 187557dacad5SJay Sternberg c.common.nsid = cpu_to_le32(cmd.nsid); 187657dacad5SJay Sternberg c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); 187757dacad5SJay Sternberg c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); 187857dacad5SJay Sternberg c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); 187957dacad5SJay Sternberg c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); 188057dacad5SJay Sternberg c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); 188157dacad5SJay Sternberg c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); 188257dacad5SJay Sternberg c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); 188357dacad5SJay Sternberg c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); 188457dacad5SJay Sternberg 188557dacad5SJay Sternberg if (cmd.timeout_ms) 188657dacad5SJay Sternberg timeout = msecs_to_jiffies(cmd.timeout_ms); 188757dacad5SJay Sternberg 188857dacad5SJay Sternberg status = __nvme_submit_sync_cmd(ns ? ns->queue : dev->admin_q, &c, 18893d42e67fSArnd Bergmann NULL, (void __user *)(uintptr_t)cmd.addr, cmd.data_len, 189057dacad5SJay Sternberg &cmd.result, timeout); 189157dacad5SJay Sternberg if (status >= 0) { 189257dacad5SJay Sternberg if (put_user(cmd.result, &ucmd->result)) 189357dacad5SJay Sternberg return -EFAULT; 189457dacad5SJay Sternberg } 189557dacad5SJay Sternberg 189657dacad5SJay Sternberg return status; 189757dacad5SJay Sternberg } 189857dacad5SJay Sternberg 189957dacad5SJay Sternberg static int nvme_subsys_reset(struct nvme_dev *dev) 190057dacad5SJay Sternberg { 190157dacad5SJay Sternberg if (!dev->subsystem) 190257dacad5SJay Sternberg return -ENOTTY; 190357dacad5SJay Sternberg 190457dacad5SJay Sternberg writel(0x4E564D65, &dev->bar->nssr); /* "NVMe" */ 190557dacad5SJay Sternberg return 0; 190657dacad5SJay Sternberg } 190757dacad5SJay Sternberg 190857dacad5SJay Sternberg static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, 190957dacad5SJay Sternberg unsigned long arg) 191057dacad5SJay Sternberg { 191157dacad5SJay Sternberg struct nvme_ns *ns = bdev->bd_disk->private_data; 191257dacad5SJay Sternberg 191357dacad5SJay Sternberg switch (cmd) { 191457dacad5SJay Sternberg case NVME_IOCTL_ID: 191557dacad5SJay Sternberg force_successful_syscall_return(); 191657dacad5SJay Sternberg return ns->ns_id; 191757dacad5SJay Sternberg case NVME_IOCTL_ADMIN_CMD: 191857dacad5SJay Sternberg return nvme_user_cmd(ns->dev, NULL, (void __user *)arg); 191957dacad5SJay Sternberg case NVME_IOCTL_IO_CMD: 192057dacad5SJay Sternberg return nvme_user_cmd(ns->dev, ns, (void __user *)arg); 192157dacad5SJay Sternberg case NVME_IOCTL_SUBMIT_IO: 192257dacad5SJay Sternberg return nvme_submit_io(ns, (void __user *)arg); 192357dacad5SJay Sternberg case SG_GET_VERSION_NUM: 192457dacad5SJay Sternberg return nvme_sg_get_version_num((void __user *)arg); 192557dacad5SJay Sternberg case SG_IO: 192657dacad5SJay Sternberg return nvme_sg_io(ns, (void __user *)arg); 192757dacad5SJay Sternberg default: 192857dacad5SJay Sternberg return -ENOTTY; 192957dacad5SJay Sternberg } 193057dacad5SJay Sternberg } 193157dacad5SJay Sternberg 193257dacad5SJay Sternberg #ifdef CONFIG_COMPAT 193357dacad5SJay Sternberg static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode, 193457dacad5SJay Sternberg unsigned int cmd, unsigned long arg) 193557dacad5SJay Sternberg { 193657dacad5SJay Sternberg switch (cmd) { 193757dacad5SJay Sternberg case SG_IO: 193857dacad5SJay Sternberg return -ENOIOCTLCMD; 193957dacad5SJay Sternberg } 194057dacad5SJay Sternberg return nvme_ioctl(bdev, mode, cmd, arg); 194157dacad5SJay Sternberg } 194257dacad5SJay Sternberg #else 194357dacad5SJay Sternberg #define nvme_compat_ioctl NULL 194457dacad5SJay Sternberg #endif 194557dacad5SJay Sternberg 194657dacad5SJay Sternberg static void nvme_free_dev(struct kref *kref); 194757dacad5SJay Sternberg static void nvme_free_ns(struct kref *kref) 194857dacad5SJay Sternberg { 194957dacad5SJay Sternberg struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); 195057dacad5SJay Sternberg 195157dacad5SJay Sternberg spin_lock(&dev_list_lock); 195257dacad5SJay Sternberg ns->disk->private_data = NULL; 195357dacad5SJay Sternberg spin_unlock(&dev_list_lock); 195457dacad5SJay Sternberg 195557dacad5SJay Sternberg kref_put(&ns->dev->kref, nvme_free_dev); 195657dacad5SJay Sternberg put_disk(ns->disk); 195757dacad5SJay Sternberg kfree(ns); 195857dacad5SJay Sternberg } 195957dacad5SJay Sternberg 196057dacad5SJay Sternberg static int nvme_open(struct block_device *bdev, fmode_t mode) 196157dacad5SJay Sternberg { 196257dacad5SJay Sternberg int ret = 0; 196357dacad5SJay Sternberg struct nvme_ns *ns; 196457dacad5SJay Sternberg 196557dacad5SJay Sternberg spin_lock(&dev_list_lock); 196657dacad5SJay Sternberg ns = bdev->bd_disk->private_data; 196757dacad5SJay Sternberg if (!ns) 196857dacad5SJay Sternberg ret = -ENXIO; 196957dacad5SJay Sternberg else if (!kref_get_unless_zero(&ns->kref)) 197057dacad5SJay Sternberg ret = -ENXIO; 197157dacad5SJay Sternberg spin_unlock(&dev_list_lock); 197257dacad5SJay Sternberg 197357dacad5SJay Sternberg return ret; 197457dacad5SJay Sternberg } 197557dacad5SJay Sternberg 197657dacad5SJay Sternberg static void nvme_release(struct gendisk *disk, fmode_t mode) 197757dacad5SJay Sternberg { 197857dacad5SJay Sternberg struct nvme_ns *ns = disk->private_data; 197957dacad5SJay Sternberg kref_put(&ns->kref, nvme_free_ns); 198057dacad5SJay Sternberg } 198157dacad5SJay Sternberg 198257dacad5SJay Sternberg static int nvme_getgeo(struct block_device *bd, struct hd_geometry *geo) 198357dacad5SJay Sternberg { 198457dacad5SJay Sternberg /* some standard values */ 198557dacad5SJay Sternberg geo->heads = 1 << 6; 198657dacad5SJay Sternberg geo->sectors = 1 << 5; 198757dacad5SJay Sternberg geo->cylinders = get_capacity(bd->bd_disk) >> 11; 198857dacad5SJay Sternberg return 0; 198957dacad5SJay Sternberg } 199057dacad5SJay Sternberg 199157dacad5SJay Sternberg static void nvme_config_discard(struct nvme_ns *ns) 199257dacad5SJay Sternberg { 199357dacad5SJay Sternberg u32 logical_block_size = queue_logical_block_size(ns->queue); 199457dacad5SJay Sternberg ns->queue->limits.discard_zeroes_data = 0; 199557dacad5SJay Sternberg ns->queue->limits.discard_alignment = logical_block_size; 199657dacad5SJay Sternberg ns->queue->limits.discard_granularity = logical_block_size; 199757dacad5SJay Sternberg blk_queue_max_discard_sectors(ns->queue, 0xffffffff); 199857dacad5SJay Sternberg queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); 199957dacad5SJay Sternberg } 200057dacad5SJay Sternberg 200157dacad5SJay Sternberg static int nvme_revalidate_disk(struct gendisk *disk) 200257dacad5SJay Sternberg { 200357dacad5SJay Sternberg struct nvme_ns *ns = disk->private_data; 200457dacad5SJay Sternberg struct nvme_dev *dev = ns->dev; 200557dacad5SJay Sternberg struct nvme_id_ns *id; 200657dacad5SJay Sternberg u8 lbaf, pi_type; 200757dacad5SJay Sternberg u16 old_ms; 200857dacad5SJay Sternberg unsigned short bs; 200957dacad5SJay Sternberg 201057dacad5SJay Sternberg if (nvme_identify_ns(dev, ns->ns_id, &id)) { 201157dacad5SJay Sternberg dev_warn(dev->dev, "%s: Identify failure nvme%dn%d\n", __func__, 201257dacad5SJay Sternberg dev->instance, ns->ns_id); 201357dacad5SJay Sternberg return -ENODEV; 201457dacad5SJay Sternberg } 201557dacad5SJay Sternberg if (id->ncap == 0) { 201657dacad5SJay Sternberg kfree(id); 201757dacad5SJay Sternberg return -ENODEV; 201857dacad5SJay Sternberg } 201957dacad5SJay Sternberg 202057dacad5SJay Sternberg old_ms = ns->ms; 202157dacad5SJay Sternberg lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK; 202257dacad5SJay Sternberg ns->lba_shift = id->lbaf[lbaf].ds; 202357dacad5SJay Sternberg ns->ms = le16_to_cpu(id->lbaf[lbaf].ms); 202457dacad5SJay Sternberg ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); 202557dacad5SJay Sternberg 202657dacad5SJay Sternberg /* 202757dacad5SJay Sternberg * If identify namespace failed, use default 512 byte block size so 202857dacad5SJay Sternberg * block layer can use before failing read/write for 0 capacity. 202957dacad5SJay Sternberg */ 203057dacad5SJay Sternberg if (ns->lba_shift == 0) 203157dacad5SJay Sternberg ns->lba_shift = 9; 203257dacad5SJay Sternberg bs = 1 << ns->lba_shift; 203357dacad5SJay Sternberg 203457dacad5SJay Sternberg /* XXX: PI implementation requires metadata equal t10 pi tuple size */ 203557dacad5SJay Sternberg pi_type = ns->ms == sizeof(struct t10_pi_tuple) ? 203657dacad5SJay Sternberg id->dps & NVME_NS_DPS_PI_MASK : 0; 203757dacad5SJay Sternberg 203857dacad5SJay Sternberg if (blk_get_integrity(disk) && (ns->pi_type != pi_type || 203957dacad5SJay Sternberg ns->ms != old_ms || 204057dacad5SJay Sternberg bs != queue_logical_block_size(disk->queue) || 204157dacad5SJay Sternberg (ns->ms && ns->ext))) 204257dacad5SJay Sternberg blk_integrity_unregister(disk); 204357dacad5SJay Sternberg 204457dacad5SJay Sternberg ns->pi_type = pi_type; 204557dacad5SJay Sternberg blk_queue_logical_block_size(ns->queue, bs); 204657dacad5SJay Sternberg 204757dacad5SJay Sternberg if (ns->ms && !blk_get_integrity(disk) && (disk->flags & GENHD_FL_UP) && 204857dacad5SJay Sternberg !ns->ext) 204957dacad5SJay Sternberg nvme_init_integrity(ns); 205057dacad5SJay Sternberg 205157dacad5SJay Sternberg if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) 205257dacad5SJay Sternberg set_capacity(disk, 0); 205357dacad5SJay Sternberg else 205457dacad5SJay Sternberg set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); 205557dacad5SJay Sternberg 205657dacad5SJay Sternberg if (dev->oncs & NVME_CTRL_ONCS_DSM) 205757dacad5SJay Sternberg nvme_config_discard(ns); 205857dacad5SJay Sternberg 205957dacad5SJay Sternberg kfree(id); 206057dacad5SJay Sternberg return 0; 206157dacad5SJay Sternberg } 206257dacad5SJay Sternberg 206357dacad5SJay Sternberg static const struct block_device_operations nvme_fops = { 206457dacad5SJay Sternberg .owner = THIS_MODULE, 206557dacad5SJay Sternberg .ioctl = nvme_ioctl, 206657dacad5SJay Sternberg .compat_ioctl = nvme_compat_ioctl, 206757dacad5SJay Sternberg .open = nvme_open, 206857dacad5SJay Sternberg .release = nvme_release, 206957dacad5SJay Sternberg .getgeo = nvme_getgeo, 207057dacad5SJay Sternberg .revalidate_disk= nvme_revalidate_disk, 207157dacad5SJay Sternberg }; 207257dacad5SJay Sternberg 207357dacad5SJay Sternberg static int nvme_kthread(void *data) 207457dacad5SJay Sternberg { 207557dacad5SJay Sternberg struct nvme_dev *dev, *next; 207657dacad5SJay Sternberg 207757dacad5SJay Sternberg while (!kthread_should_stop()) { 207857dacad5SJay Sternberg set_current_state(TASK_INTERRUPTIBLE); 207957dacad5SJay Sternberg spin_lock(&dev_list_lock); 208057dacad5SJay Sternberg list_for_each_entry_safe(dev, next, &dev_list, node) { 208157dacad5SJay Sternberg int i; 208257dacad5SJay Sternberg u32 csts = readl(&dev->bar->csts); 208357dacad5SJay Sternberg 208457dacad5SJay Sternberg if ((dev->subsystem && (csts & NVME_CSTS_NSSRO)) || 208557dacad5SJay Sternberg csts & NVME_CSTS_CFS) { 208657dacad5SJay Sternberg if (!__nvme_reset(dev)) { 208757dacad5SJay Sternberg dev_warn(dev->dev, 208857dacad5SJay Sternberg "Failed status: %x, reset controller\n", 208957dacad5SJay Sternberg readl(&dev->bar->csts)); 209057dacad5SJay Sternberg } 209157dacad5SJay Sternberg continue; 209257dacad5SJay Sternberg } 209357dacad5SJay Sternberg for (i = 0; i < dev->queue_count; i++) { 209457dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 209557dacad5SJay Sternberg if (!nvmeq) 209657dacad5SJay Sternberg continue; 209757dacad5SJay Sternberg spin_lock_irq(&nvmeq->q_lock); 209857dacad5SJay Sternberg nvme_process_cq(nvmeq); 209957dacad5SJay Sternberg 210057dacad5SJay Sternberg while ((i == 0) && (dev->event_limit > 0)) { 210157dacad5SJay Sternberg if (nvme_submit_async_admin_req(dev)) 210257dacad5SJay Sternberg break; 210357dacad5SJay Sternberg dev->event_limit--; 210457dacad5SJay Sternberg } 210557dacad5SJay Sternberg spin_unlock_irq(&nvmeq->q_lock); 210657dacad5SJay Sternberg } 210757dacad5SJay Sternberg } 210857dacad5SJay Sternberg spin_unlock(&dev_list_lock); 210957dacad5SJay Sternberg schedule_timeout(round_jiffies_relative(HZ)); 211057dacad5SJay Sternberg } 211157dacad5SJay Sternberg return 0; 211257dacad5SJay Sternberg } 211357dacad5SJay Sternberg 211457dacad5SJay Sternberg static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid) 211557dacad5SJay Sternberg { 211657dacad5SJay Sternberg struct nvme_ns *ns; 211757dacad5SJay Sternberg struct gendisk *disk; 211857dacad5SJay Sternberg int node = dev_to_node(dev->dev); 211957dacad5SJay Sternberg 212057dacad5SJay Sternberg ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); 212157dacad5SJay Sternberg if (!ns) 212257dacad5SJay Sternberg return; 212357dacad5SJay Sternberg 212457dacad5SJay Sternberg ns->queue = blk_mq_init_queue(&dev->tagset); 212557dacad5SJay Sternberg if (IS_ERR(ns->queue)) 212657dacad5SJay Sternberg goto out_free_ns; 212757dacad5SJay Sternberg queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue); 212857dacad5SJay Sternberg queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); 212957dacad5SJay Sternberg ns->dev = dev; 213057dacad5SJay Sternberg ns->queue->queuedata = ns; 213157dacad5SJay Sternberg 213257dacad5SJay Sternberg disk = alloc_disk_node(0, node); 213357dacad5SJay Sternberg if (!disk) 213457dacad5SJay Sternberg goto out_free_queue; 213557dacad5SJay Sternberg 213657dacad5SJay Sternberg kref_init(&ns->kref); 213757dacad5SJay Sternberg ns->ns_id = nsid; 213857dacad5SJay Sternberg ns->disk = disk; 213957dacad5SJay Sternberg ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ 214057dacad5SJay Sternberg list_add_tail(&ns->list, &dev->namespaces); 214157dacad5SJay Sternberg 214257dacad5SJay Sternberg blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); 214357dacad5SJay Sternberg if (dev->max_hw_sectors) { 214457dacad5SJay Sternberg blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors); 214557dacad5SJay Sternberg blk_queue_max_segments(ns->queue, 214657dacad5SJay Sternberg ((dev->max_hw_sectors << 9) / dev->page_size) + 1); 214757dacad5SJay Sternberg } 214857dacad5SJay Sternberg if (dev->stripe_size) 214957dacad5SJay Sternberg blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9); 215057dacad5SJay Sternberg if (dev->vwc & NVME_CTRL_VWC_PRESENT) 215157dacad5SJay Sternberg blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA); 215257dacad5SJay Sternberg blk_queue_virt_boundary(ns->queue, dev->page_size - 1); 215357dacad5SJay Sternberg 215457dacad5SJay Sternberg disk->major = nvme_major; 215557dacad5SJay Sternberg disk->first_minor = 0; 215657dacad5SJay Sternberg disk->fops = &nvme_fops; 215757dacad5SJay Sternberg disk->private_data = ns; 215857dacad5SJay Sternberg disk->queue = ns->queue; 215957dacad5SJay Sternberg disk->driverfs_dev = dev->device; 216057dacad5SJay Sternberg disk->flags = GENHD_FL_EXT_DEVT; 216157dacad5SJay Sternberg sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid); 216257dacad5SJay Sternberg 216357dacad5SJay Sternberg /* 216457dacad5SJay Sternberg * Initialize capacity to 0 until we establish the namespace format and 216557dacad5SJay Sternberg * setup integrity extentions if necessary. The revalidate_disk after 216657dacad5SJay Sternberg * add_disk allows the driver to register with integrity if the format 216757dacad5SJay Sternberg * requires it. 216857dacad5SJay Sternberg */ 216957dacad5SJay Sternberg set_capacity(disk, 0); 217057dacad5SJay Sternberg if (nvme_revalidate_disk(ns->disk)) 217157dacad5SJay Sternberg goto out_free_disk; 217257dacad5SJay Sternberg 217357dacad5SJay Sternberg kref_get(&dev->kref); 217457dacad5SJay Sternberg add_disk(ns->disk); 217557dacad5SJay Sternberg if (ns->ms) { 217657dacad5SJay Sternberg struct block_device *bd = bdget_disk(ns->disk, 0); 217757dacad5SJay Sternberg if (!bd) 217857dacad5SJay Sternberg return; 217957dacad5SJay Sternberg if (blkdev_get(bd, FMODE_READ, NULL)) { 218057dacad5SJay Sternberg bdput(bd); 218157dacad5SJay Sternberg return; 218257dacad5SJay Sternberg } 218357dacad5SJay Sternberg blkdev_reread_part(bd); 218457dacad5SJay Sternberg blkdev_put(bd, FMODE_READ); 218557dacad5SJay Sternberg } 218657dacad5SJay Sternberg return; 218757dacad5SJay Sternberg out_free_disk: 218857dacad5SJay Sternberg kfree(disk); 218957dacad5SJay Sternberg list_del(&ns->list); 219057dacad5SJay Sternberg out_free_queue: 219157dacad5SJay Sternberg blk_cleanup_queue(ns->queue); 219257dacad5SJay Sternberg out_free_ns: 219357dacad5SJay Sternberg kfree(ns); 219457dacad5SJay Sternberg } 219557dacad5SJay Sternberg 219657dacad5SJay Sternberg /* 219757dacad5SJay Sternberg * Create I/O queues. Failing to create an I/O queue is not an issue, 219857dacad5SJay Sternberg * we can continue with less than the desired amount of queues, and 219957dacad5SJay Sternberg * even a controller without I/O queues an still be used to issue 220057dacad5SJay Sternberg * admin commands. This might be useful to upgrade a buggy firmware 220157dacad5SJay Sternberg * for example. 220257dacad5SJay Sternberg */ 220357dacad5SJay Sternberg static void nvme_create_io_queues(struct nvme_dev *dev) 220457dacad5SJay Sternberg { 220557dacad5SJay Sternberg unsigned i; 220657dacad5SJay Sternberg 220757dacad5SJay Sternberg for (i = dev->queue_count; i <= dev->max_qid; i++) 220857dacad5SJay Sternberg if (!nvme_alloc_queue(dev, i, dev->q_depth)) 220957dacad5SJay Sternberg break; 221057dacad5SJay Sternberg 221157dacad5SJay Sternberg for (i = dev->online_queues; i <= dev->queue_count - 1; i++) 221257dacad5SJay Sternberg if (nvme_create_queue(dev->queues[i], i)) { 221357dacad5SJay Sternberg nvme_free_queues(dev, i); 221457dacad5SJay Sternberg break; 221557dacad5SJay Sternberg } 221657dacad5SJay Sternberg } 221757dacad5SJay Sternberg 221857dacad5SJay Sternberg static int set_queue_count(struct nvme_dev *dev, int count) 221957dacad5SJay Sternberg { 222057dacad5SJay Sternberg int status; 222157dacad5SJay Sternberg u32 result; 222257dacad5SJay Sternberg u32 q_count = (count - 1) | ((count - 1) << 16); 222357dacad5SJay Sternberg 222457dacad5SJay Sternberg status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0, 222557dacad5SJay Sternberg &result); 222657dacad5SJay Sternberg if (status < 0) 222757dacad5SJay Sternberg return status; 222857dacad5SJay Sternberg if (status > 0) { 222957dacad5SJay Sternberg dev_err(dev->dev, "Could not set queue count (%d)\n", status); 223057dacad5SJay Sternberg return 0; 223157dacad5SJay Sternberg } 223257dacad5SJay Sternberg return min(result & 0xffff, result >> 16) + 1; 223357dacad5SJay Sternberg } 223457dacad5SJay Sternberg 223557dacad5SJay Sternberg static void __iomem *nvme_map_cmb(struct nvme_dev *dev) 223657dacad5SJay Sternberg { 223757dacad5SJay Sternberg u64 szu, size, offset; 223857dacad5SJay Sternberg u32 cmbloc; 223957dacad5SJay Sternberg resource_size_t bar_size; 224057dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 224157dacad5SJay Sternberg void __iomem *cmb; 224257dacad5SJay Sternberg dma_addr_t dma_addr; 224357dacad5SJay Sternberg 224457dacad5SJay Sternberg if (!use_cmb_sqes) 224557dacad5SJay Sternberg return NULL; 224657dacad5SJay Sternberg 224757dacad5SJay Sternberg dev->cmbsz = readl(&dev->bar->cmbsz); 224857dacad5SJay Sternberg if (!(NVME_CMB_SZ(dev->cmbsz))) 224957dacad5SJay Sternberg return NULL; 225057dacad5SJay Sternberg 225157dacad5SJay Sternberg cmbloc = readl(&dev->bar->cmbloc); 225257dacad5SJay Sternberg 225357dacad5SJay Sternberg szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); 225457dacad5SJay Sternberg size = szu * NVME_CMB_SZ(dev->cmbsz); 225557dacad5SJay Sternberg offset = szu * NVME_CMB_OFST(cmbloc); 225657dacad5SJay Sternberg bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc)); 225757dacad5SJay Sternberg 225857dacad5SJay Sternberg if (offset > bar_size) 225957dacad5SJay Sternberg return NULL; 226057dacad5SJay Sternberg 226157dacad5SJay Sternberg /* 226257dacad5SJay Sternberg * Controllers may support a CMB size larger than their BAR, 226357dacad5SJay Sternberg * for example, due to being behind a bridge. Reduce the CMB to 226457dacad5SJay Sternberg * the reported size of the BAR 226557dacad5SJay Sternberg */ 226657dacad5SJay Sternberg if (size > bar_size - offset) 226757dacad5SJay Sternberg size = bar_size - offset; 226857dacad5SJay Sternberg 226957dacad5SJay Sternberg dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset; 227057dacad5SJay Sternberg cmb = ioremap_wc(dma_addr, size); 227157dacad5SJay Sternberg if (!cmb) 227257dacad5SJay Sternberg return NULL; 227357dacad5SJay Sternberg 227457dacad5SJay Sternberg dev->cmb_dma_addr = dma_addr; 227557dacad5SJay Sternberg dev->cmb_size = size; 227657dacad5SJay Sternberg return cmb; 227757dacad5SJay Sternberg } 227857dacad5SJay Sternberg 227957dacad5SJay Sternberg static inline void nvme_release_cmb(struct nvme_dev *dev) 228057dacad5SJay Sternberg { 228157dacad5SJay Sternberg if (dev->cmb) { 228257dacad5SJay Sternberg iounmap(dev->cmb); 228357dacad5SJay Sternberg dev->cmb = NULL; 228457dacad5SJay Sternberg } 228557dacad5SJay Sternberg } 228657dacad5SJay Sternberg 228757dacad5SJay Sternberg static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) 228857dacad5SJay Sternberg { 228957dacad5SJay Sternberg return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); 229057dacad5SJay Sternberg } 229157dacad5SJay Sternberg 229257dacad5SJay Sternberg static int nvme_setup_io_queues(struct nvme_dev *dev) 229357dacad5SJay Sternberg { 229457dacad5SJay Sternberg struct nvme_queue *adminq = dev->queues[0]; 229557dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 229657dacad5SJay Sternberg int result, i, vecs, nr_io_queues, size; 229757dacad5SJay Sternberg 229857dacad5SJay Sternberg nr_io_queues = num_possible_cpus(); 229957dacad5SJay Sternberg result = set_queue_count(dev, nr_io_queues); 230057dacad5SJay Sternberg if (result <= 0) 230157dacad5SJay Sternberg return result; 230257dacad5SJay Sternberg if (result < nr_io_queues) 230357dacad5SJay Sternberg nr_io_queues = result; 230457dacad5SJay Sternberg 230557dacad5SJay Sternberg if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { 230657dacad5SJay Sternberg result = nvme_cmb_qdepth(dev, nr_io_queues, 230757dacad5SJay Sternberg sizeof(struct nvme_command)); 230857dacad5SJay Sternberg if (result > 0) 230957dacad5SJay Sternberg dev->q_depth = result; 231057dacad5SJay Sternberg else 231157dacad5SJay Sternberg nvme_release_cmb(dev); 231257dacad5SJay Sternberg } 231357dacad5SJay Sternberg 231457dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 231557dacad5SJay Sternberg if (size > 8192) { 231657dacad5SJay Sternberg iounmap(dev->bar); 231757dacad5SJay Sternberg do { 231857dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), size); 231957dacad5SJay Sternberg if (dev->bar) 232057dacad5SJay Sternberg break; 232157dacad5SJay Sternberg if (!--nr_io_queues) 232257dacad5SJay Sternberg return -ENOMEM; 232357dacad5SJay Sternberg size = db_bar_size(dev, nr_io_queues); 232457dacad5SJay Sternberg } while (1); 232557dacad5SJay Sternberg dev->dbs = ((void __iomem *)dev->bar) + 4096; 232657dacad5SJay Sternberg adminq->q_db = dev->dbs; 232757dacad5SJay Sternberg } 232857dacad5SJay Sternberg 232957dacad5SJay Sternberg /* Deregister the admin queue's interrupt */ 233057dacad5SJay Sternberg free_irq(dev->entry[0].vector, adminq); 233157dacad5SJay Sternberg 233257dacad5SJay Sternberg /* 233357dacad5SJay Sternberg * If we enable msix early due to not intx, disable it again before 233457dacad5SJay Sternberg * setting up the full range we need. 233557dacad5SJay Sternberg */ 233657dacad5SJay Sternberg if (!pdev->irq) 233757dacad5SJay Sternberg pci_disable_msix(pdev); 233857dacad5SJay Sternberg 233957dacad5SJay Sternberg for (i = 0; i < nr_io_queues; i++) 234057dacad5SJay Sternberg dev->entry[i].entry = i; 234157dacad5SJay Sternberg vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); 234257dacad5SJay Sternberg if (vecs < 0) { 234357dacad5SJay Sternberg vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); 234457dacad5SJay Sternberg if (vecs < 0) { 234557dacad5SJay Sternberg vecs = 1; 234657dacad5SJay Sternberg } else { 234757dacad5SJay Sternberg for (i = 0; i < vecs; i++) 234857dacad5SJay Sternberg dev->entry[i].vector = i + pdev->irq; 234957dacad5SJay Sternberg } 235057dacad5SJay Sternberg } 235157dacad5SJay Sternberg 235257dacad5SJay Sternberg /* 235357dacad5SJay Sternberg * Should investigate if there's a performance win from allocating 235457dacad5SJay Sternberg * more queues than interrupt vectors; it might allow the submission 235557dacad5SJay Sternberg * path to scale better, even if the receive path is limited by the 235657dacad5SJay Sternberg * number of interrupts. 235757dacad5SJay Sternberg */ 235857dacad5SJay Sternberg nr_io_queues = vecs; 235957dacad5SJay Sternberg dev->max_qid = nr_io_queues; 236057dacad5SJay Sternberg 236157dacad5SJay Sternberg result = queue_request_irq(dev, adminq, adminq->irqname); 236257dacad5SJay Sternberg if (result) { 236357dacad5SJay Sternberg adminq->cq_vector = -1; 236457dacad5SJay Sternberg goto free_queues; 236557dacad5SJay Sternberg } 236657dacad5SJay Sternberg 236757dacad5SJay Sternberg /* Free previously allocated queues that are no longer usable */ 236857dacad5SJay Sternberg nvme_free_queues(dev, nr_io_queues + 1); 236957dacad5SJay Sternberg nvme_create_io_queues(dev); 237057dacad5SJay Sternberg 237157dacad5SJay Sternberg return 0; 237257dacad5SJay Sternberg 237357dacad5SJay Sternberg free_queues: 237457dacad5SJay Sternberg nvme_free_queues(dev, 1); 237557dacad5SJay Sternberg return result; 237657dacad5SJay Sternberg } 237757dacad5SJay Sternberg 237857dacad5SJay Sternberg static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) 237957dacad5SJay Sternberg { 238057dacad5SJay Sternberg struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); 238157dacad5SJay Sternberg struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); 238257dacad5SJay Sternberg 238357dacad5SJay Sternberg return nsa->ns_id - nsb->ns_id; 238457dacad5SJay Sternberg } 238557dacad5SJay Sternberg 238657dacad5SJay Sternberg static struct nvme_ns *nvme_find_ns(struct nvme_dev *dev, unsigned nsid) 238757dacad5SJay Sternberg { 238857dacad5SJay Sternberg struct nvme_ns *ns; 238957dacad5SJay Sternberg 239057dacad5SJay Sternberg list_for_each_entry(ns, &dev->namespaces, list) { 239157dacad5SJay Sternberg if (ns->ns_id == nsid) 239257dacad5SJay Sternberg return ns; 239357dacad5SJay Sternberg if (ns->ns_id > nsid) 239457dacad5SJay Sternberg break; 239557dacad5SJay Sternberg } 239657dacad5SJay Sternberg return NULL; 239757dacad5SJay Sternberg } 239857dacad5SJay Sternberg 239957dacad5SJay Sternberg static inline bool nvme_io_incapable(struct nvme_dev *dev) 240057dacad5SJay Sternberg { 240157dacad5SJay Sternberg return (!dev->bar || readl(&dev->bar->csts) & NVME_CSTS_CFS || 240257dacad5SJay Sternberg dev->online_queues < 2); 240357dacad5SJay Sternberg } 240457dacad5SJay Sternberg 240557dacad5SJay Sternberg static void nvme_ns_remove(struct nvme_ns *ns) 240657dacad5SJay Sternberg { 240757dacad5SJay Sternberg bool kill = nvme_io_incapable(ns->dev) && !blk_queue_dying(ns->queue); 240857dacad5SJay Sternberg 240957dacad5SJay Sternberg if (kill) 241057dacad5SJay Sternberg blk_set_queue_dying(ns->queue); 241157dacad5SJay Sternberg if (ns->disk->flags & GENHD_FL_UP) { 241257dacad5SJay Sternberg if (blk_get_integrity(ns->disk)) 241357dacad5SJay Sternberg blk_integrity_unregister(ns->disk); 241457dacad5SJay Sternberg del_gendisk(ns->disk); 241557dacad5SJay Sternberg } 241657dacad5SJay Sternberg if (kill || !blk_queue_dying(ns->queue)) { 241757dacad5SJay Sternberg blk_mq_abort_requeue_list(ns->queue); 241857dacad5SJay Sternberg blk_cleanup_queue(ns->queue); 241957dacad5SJay Sternberg } 242057dacad5SJay Sternberg list_del_init(&ns->list); 242157dacad5SJay Sternberg kref_put(&ns->kref, nvme_free_ns); 242257dacad5SJay Sternberg } 242357dacad5SJay Sternberg 242457dacad5SJay Sternberg static void nvme_scan_namespaces(struct nvme_dev *dev, unsigned nn) 242557dacad5SJay Sternberg { 242657dacad5SJay Sternberg struct nvme_ns *ns, *next; 242757dacad5SJay Sternberg unsigned i; 242857dacad5SJay Sternberg 242957dacad5SJay Sternberg for (i = 1; i <= nn; i++) { 243057dacad5SJay Sternberg ns = nvme_find_ns(dev, i); 243157dacad5SJay Sternberg if (ns) { 243257dacad5SJay Sternberg if (revalidate_disk(ns->disk)) 243357dacad5SJay Sternberg nvme_ns_remove(ns); 243457dacad5SJay Sternberg } else 243557dacad5SJay Sternberg nvme_alloc_ns(dev, i); 243657dacad5SJay Sternberg } 243757dacad5SJay Sternberg list_for_each_entry_safe(ns, next, &dev->namespaces, list) { 243857dacad5SJay Sternberg if (ns->ns_id > nn) 243957dacad5SJay Sternberg nvme_ns_remove(ns); 244057dacad5SJay Sternberg } 244157dacad5SJay Sternberg list_sort(NULL, &dev->namespaces, ns_cmp); 244257dacad5SJay Sternberg } 244357dacad5SJay Sternberg 244457dacad5SJay Sternberg static void nvme_set_irq_hints(struct nvme_dev *dev) 244557dacad5SJay Sternberg { 244657dacad5SJay Sternberg struct nvme_queue *nvmeq; 244757dacad5SJay Sternberg int i; 244857dacad5SJay Sternberg 244957dacad5SJay Sternberg for (i = 0; i < dev->online_queues; i++) { 245057dacad5SJay Sternberg nvmeq = dev->queues[i]; 245157dacad5SJay Sternberg 245257dacad5SJay Sternberg if (!nvmeq->tags || !(*nvmeq->tags)) 245357dacad5SJay Sternberg continue; 245457dacad5SJay Sternberg 245557dacad5SJay Sternberg irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, 245657dacad5SJay Sternberg blk_mq_tags_cpumask(*nvmeq->tags)); 245757dacad5SJay Sternberg } 245857dacad5SJay Sternberg } 245957dacad5SJay Sternberg 246057dacad5SJay Sternberg static void nvme_dev_scan(struct work_struct *work) 246157dacad5SJay Sternberg { 246257dacad5SJay Sternberg struct nvme_dev *dev = container_of(work, struct nvme_dev, scan_work); 246357dacad5SJay Sternberg struct nvme_id_ctrl *ctrl; 246457dacad5SJay Sternberg 246557dacad5SJay Sternberg if (!dev->tagset.tags) 246657dacad5SJay Sternberg return; 246757dacad5SJay Sternberg if (nvme_identify_ctrl(dev, &ctrl)) 246857dacad5SJay Sternberg return; 246957dacad5SJay Sternberg nvme_scan_namespaces(dev, le32_to_cpup(&ctrl->nn)); 247057dacad5SJay Sternberg kfree(ctrl); 247157dacad5SJay Sternberg nvme_set_irq_hints(dev); 247257dacad5SJay Sternberg } 247357dacad5SJay Sternberg 247457dacad5SJay Sternberg /* 247557dacad5SJay Sternberg * Return: error value if an error occurred setting up the queues or calling 247657dacad5SJay Sternberg * Identify Device. 0 if these succeeded, even if adding some of the 247757dacad5SJay Sternberg * namespaces failed. At the moment, these failures are silent. TBD which 247857dacad5SJay Sternberg * failures should be reported. 247957dacad5SJay Sternberg */ 248057dacad5SJay Sternberg static int nvme_dev_add(struct nvme_dev *dev) 248157dacad5SJay Sternberg { 248257dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 248357dacad5SJay Sternberg int res; 248457dacad5SJay Sternberg struct nvme_id_ctrl *ctrl; 248557dacad5SJay Sternberg int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12; 248657dacad5SJay Sternberg 248757dacad5SJay Sternberg res = nvme_identify_ctrl(dev, &ctrl); 248857dacad5SJay Sternberg if (res) { 248957dacad5SJay Sternberg dev_err(dev->dev, "Identify Controller failed (%d)\n", res); 249057dacad5SJay Sternberg return -EIO; 249157dacad5SJay Sternberg } 249257dacad5SJay Sternberg 249357dacad5SJay Sternberg dev->oncs = le16_to_cpup(&ctrl->oncs); 249457dacad5SJay Sternberg dev->abort_limit = ctrl->acl + 1; 249557dacad5SJay Sternberg dev->vwc = ctrl->vwc; 249657dacad5SJay Sternberg memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn)); 249757dacad5SJay Sternberg memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn)); 249857dacad5SJay Sternberg memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr)); 249957dacad5SJay Sternberg if (ctrl->mdts) 250057dacad5SJay Sternberg dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9); 250157dacad5SJay Sternberg if ((pdev->vendor == PCI_VENDOR_ID_INTEL) && 250257dacad5SJay Sternberg (pdev->device == 0x0953) && ctrl->vs[3]) { 250357dacad5SJay Sternberg unsigned int max_hw_sectors; 250457dacad5SJay Sternberg 250557dacad5SJay Sternberg dev->stripe_size = 1 << (ctrl->vs[3] + shift); 250657dacad5SJay Sternberg max_hw_sectors = dev->stripe_size >> (shift - 9); 250757dacad5SJay Sternberg if (dev->max_hw_sectors) { 250857dacad5SJay Sternberg dev->max_hw_sectors = min(max_hw_sectors, 250957dacad5SJay Sternberg dev->max_hw_sectors); 251057dacad5SJay Sternberg } else 251157dacad5SJay Sternberg dev->max_hw_sectors = max_hw_sectors; 251257dacad5SJay Sternberg } 251357dacad5SJay Sternberg kfree(ctrl); 251457dacad5SJay Sternberg 251557dacad5SJay Sternberg if (!dev->tagset.tags) { 251657dacad5SJay Sternberg dev->tagset.ops = &nvme_mq_ops; 251757dacad5SJay Sternberg dev->tagset.nr_hw_queues = dev->online_queues - 1; 251857dacad5SJay Sternberg dev->tagset.timeout = NVME_IO_TIMEOUT; 251957dacad5SJay Sternberg dev->tagset.numa_node = dev_to_node(dev->dev); 252057dacad5SJay Sternberg dev->tagset.queue_depth = 252157dacad5SJay Sternberg min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; 252257dacad5SJay Sternberg dev->tagset.cmd_size = nvme_cmd_size(dev); 252357dacad5SJay Sternberg dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; 252457dacad5SJay Sternberg dev->tagset.driver_data = dev; 252557dacad5SJay Sternberg 252657dacad5SJay Sternberg if (blk_mq_alloc_tag_set(&dev->tagset)) 252757dacad5SJay Sternberg return 0; 252857dacad5SJay Sternberg } 252957dacad5SJay Sternberg schedule_work(&dev->scan_work); 253057dacad5SJay Sternberg return 0; 253157dacad5SJay Sternberg } 253257dacad5SJay Sternberg 253357dacad5SJay Sternberg static int nvme_dev_map(struct nvme_dev *dev) 253457dacad5SJay Sternberg { 253557dacad5SJay Sternberg u64 cap; 253657dacad5SJay Sternberg int bars, result = -ENOMEM; 253757dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 253857dacad5SJay Sternberg 253957dacad5SJay Sternberg if (pci_enable_device_mem(pdev)) 254057dacad5SJay Sternberg return result; 254157dacad5SJay Sternberg 254257dacad5SJay Sternberg dev->entry[0].vector = pdev->irq; 254357dacad5SJay Sternberg pci_set_master(pdev); 254457dacad5SJay Sternberg bars = pci_select_bars(pdev, IORESOURCE_MEM); 254557dacad5SJay Sternberg if (!bars) 254657dacad5SJay Sternberg goto disable_pci; 254757dacad5SJay Sternberg 254857dacad5SJay Sternberg if (pci_request_selected_regions(pdev, bars, "nvme")) 254957dacad5SJay Sternberg goto disable_pci; 255057dacad5SJay Sternberg 255157dacad5SJay Sternberg if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && 255257dacad5SJay Sternberg dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) 255357dacad5SJay Sternberg goto disable; 255457dacad5SJay Sternberg 255557dacad5SJay Sternberg dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); 255657dacad5SJay Sternberg if (!dev->bar) 255757dacad5SJay Sternberg goto disable; 255857dacad5SJay Sternberg 255957dacad5SJay Sternberg if (readl(&dev->bar->csts) == -1) { 256057dacad5SJay Sternberg result = -ENODEV; 256157dacad5SJay Sternberg goto unmap; 256257dacad5SJay Sternberg } 256357dacad5SJay Sternberg 256457dacad5SJay Sternberg /* 256557dacad5SJay Sternberg * Some devices don't advertse INTx interrupts, pre-enable a single 256657dacad5SJay Sternberg * MSIX vec for setup. We'll adjust this later. 256757dacad5SJay Sternberg */ 256857dacad5SJay Sternberg if (!pdev->irq) { 256957dacad5SJay Sternberg result = pci_enable_msix(pdev, dev->entry, 1); 257057dacad5SJay Sternberg if (result < 0) 257157dacad5SJay Sternberg goto unmap; 257257dacad5SJay Sternberg } 257357dacad5SJay Sternberg 257457dacad5SJay Sternberg cap = readq(&dev->bar->cap); 257557dacad5SJay Sternberg dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); 257657dacad5SJay Sternberg dev->db_stride = 1 << NVME_CAP_STRIDE(cap); 257757dacad5SJay Sternberg dev->dbs = ((void __iomem *)dev->bar) + 4096; 257857dacad5SJay Sternberg if (readl(&dev->bar->vs) >= NVME_VS(1, 2)) 257957dacad5SJay Sternberg dev->cmb = nvme_map_cmb(dev); 258057dacad5SJay Sternberg 258157dacad5SJay Sternberg return 0; 258257dacad5SJay Sternberg 258357dacad5SJay Sternberg unmap: 258457dacad5SJay Sternberg iounmap(dev->bar); 258557dacad5SJay Sternberg dev->bar = NULL; 258657dacad5SJay Sternberg disable: 258757dacad5SJay Sternberg pci_release_regions(pdev); 258857dacad5SJay Sternberg disable_pci: 258957dacad5SJay Sternberg pci_disable_device(pdev); 259057dacad5SJay Sternberg return result; 259157dacad5SJay Sternberg } 259257dacad5SJay Sternberg 259357dacad5SJay Sternberg static void nvme_dev_unmap(struct nvme_dev *dev) 259457dacad5SJay Sternberg { 259557dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 259657dacad5SJay Sternberg 259757dacad5SJay Sternberg if (pdev->msi_enabled) 259857dacad5SJay Sternberg pci_disable_msi(pdev); 259957dacad5SJay Sternberg else if (pdev->msix_enabled) 260057dacad5SJay Sternberg pci_disable_msix(pdev); 260157dacad5SJay Sternberg 260257dacad5SJay Sternberg if (dev->bar) { 260357dacad5SJay Sternberg iounmap(dev->bar); 260457dacad5SJay Sternberg dev->bar = NULL; 260557dacad5SJay Sternberg pci_release_regions(pdev); 260657dacad5SJay Sternberg } 260757dacad5SJay Sternberg 260857dacad5SJay Sternberg if (pci_is_enabled(pdev)) 260957dacad5SJay Sternberg pci_disable_device(pdev); 261057dacad5SJay Sternberg } 261157dacad5SJay Sternberg 261257dacad5SJay Sternberg struct nvme_delq_ctx { 261357dacad5SJay Sternberg struct task_struct *waiter; 261457dacad5SJay Sternberg struct kthread_worker *worker; 261557dacad5SJay Sternberg atomic_t refcount; 261657dacad5SJay Sternberg }; 261757dacad5SJay Sternberg 261857dacad5SJay Sternberg static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev) 261957dacad5SJay Sternberg { 262057dacad5SJay Sternberg dq->waiter = current; 262157dacad5SJay Sternberg mb(); 262257dacad5SJay Sternberg 262357dacad5SJay Sternberg for (;;) { 262457dacad5SJay Sternberg set_current_state(TASK_KILLABLE); 262557dacad5SJay Sternberg if (!atomic_read(&dq->refcount)) 262657dacad5SJay Sternberg break; 262757dacad5SJay Sternberg if (!schedule_timeout(ADMIN_TIMEOUT) || 262857dacad5SJay Sternberg fatal_signal_pending(current)) { 262957dacad5SJay Sternberg /* 263057dacad5SJay Sternberg * Disable the controller first since we can't trust it 263157dacad5SJay Sternberg * at this point, but leave the admin queue enabled 263257dacad5SJay Sternberg * until all queue deletion requests are flushed. 263357dacad5SJay Sternberg * FIXME: This may take a while if there are more h/w 263457dacad5SJay Sternberg * queues than admin tags. 263557dacad5SJay Sternberg */ 263657dacad5SJay Sternberg set_current_state(TASK_RUNNING); 263757dacad5SJay Sternberg nvme_disable_ctrl(dev, readq(&dev->bar->cap)); 263857dacad5SJay Sternberg nvme_clear_queue(dev->queues[0]); 263957dacad5SJay Sternberg flush_kthread_worker(dq->worker); 264057dacad5SJay Sternberg nvme_disable_queue(dev, 0); 264157dacad5SJay Sternberg return; 264257dacad5SJay Sternberg } 264357dacad5SJay Sternberg } 264457dacad5SJay Sternberg set_current_state(TASK_RUNNING); 264557dacad5SJay Sternberg } 264657dacad5SJay Sternberg 264757dacad5SJay Sternberg static void nvme_put_dq(struct nvme_delq_ctx *dq) 264857dacad5SJay Sternberg { 264957dacad5SJay Sternberg atomic_dec(&dq->refcount); 265057dacad5SJay Sternberg if (dq->waiter) 265157dacad5SJay Sternberg wake_up_process(dq->waiter); 265257dacad5SJay Sternberg } 265357dacad5SJay Sternberg 265457dacad5SJay Sternberg static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq) 265557dacad5SJay Sternberg { 265657dacad5SJay Sternberg atomic_inc(&dq->refcount); 265757dacad5SJay Sternberg return dq; 265857dacad5SJay Sternberg } 265957dacad5SJay Sternberg 266057dacad5SJay Sternberg static void nvme_del_queue_end(struct nvme_queue *nvmeq) 266157dacad5SJay Sternberg { 266257dacad5SJay Sternberg struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx; 266357dacad5SJay Sternberg nvme_put_dq(dq); 266457dacad5SJay Sternberg } 266557dacad5SJay Sternberg 266657dacad5SJay Sternberg static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode, 266757dacad5SJay Sternberg kthread_work_func_t fn) 266857dacad5SJay Sternberg { 266957dacad5SJay Sternberg struct nvme_command c; 267057dacad5SJay Sternberg 267157dacad5SJay Sternberg memset(&c, 0, sizeof(c)); 267257dacad5SJay Sternberg c.delete_queue.opcode = opcode; 267357dacad5SJay Sternberg c.delete_queue.qid = cpu_to_le16(nvmeq->qid); 267457dacad5SJay Sternberg 267557dacad5SJay Sternberg init_kthread_work(&nvmeq->cmdinfo.work, fn); 267657dacad5SJay Sternberg return nvme_submit_admin_async_cmd(nvmeq->dev, &c, &nvmeq->cmdinfo, 267757dacad5SJay Sternberg ADMIN_TIMEOUT); 267857dacad5SJay Sternberg } 267957dacad5SJay Sternberg 268057dacad5SJay Sternberg static void nvme_del_cq_work_handler(struct kthread_work *work) 268157dacad5SJay Sternberg { 268257dacad5SJay Sternberg struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, 268357dacad5SJay Sternberg cmdinfo.work); 268457dacad5SJay Sternberg nvme_del_queue_end(nvmeq); 268557dacad5SJay Sternberg } 268657dacad5SJay Sternberg 268757dacad5SJay Sternberg static int nvme_delete_cq(struct nvme_queue *nvmeq) 268857dacad5SJay Sternberg { 268957dacad5SJay Sternberg return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq, 269057dacad5SJay Sternberg nvme_del_cq_work_handler); 269157dacad5SJay Sternberg } 269257dacad5SJay Sternberg 269357dacad5SJay Sternberg static void nvme_del_sq_work_handler(struct kthread_work *work) 269457dacad5SJay Sternberg { 269557dacad5SJay Sternberg struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, 269657dacad5SJay Sternberg cmdinfo.work); 269757dacad5SJay Sternberg int status = nvmeq->cmdinfo.status; 269857dacad5SJay Sternberg 269957dacad5SJay Sternberg if (!status) 270057dacad5SJay Sternberg status = nvme_delete_cq(nvmeq); 270157dacad5SJay Sternberg if (status) 270257dacad5SJay Sternberg nvme_del_queue_end(nvmeq); 270357dacad5SJay Sternberg } 270457dacad5SJay Sternberg 270557dacad5SJay Sternberg static int nvme_delete_sq(struct nvme_queue *nvmeq) 270657dacad5SJay Sternberg { 270757dacad5SJay Sternberg return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq, 270857dacad5SJay Sternberg nvme_del_sq_work_handler); 270957dacad5SJay Sternberg } 271057dacad5SJay Sternberg 271157dacad5SJay Sternberg static void nvme_del_queue_start(struct kthread_work *work) 271257dacad5SJay Sternberg { 271357dacad5SJay Sternberg struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, 271457dacad5SJay Sternberg cmdinfo.work); 271557dacad5SJay Sternberg if (nvme_delete_sq(nvmeq)) 271657dacad5SJay Sternberg nvme_del_queue_end(nvmeq); 271757dacad5SJay Sternberg } 271857dacad5SJay Sternberg 271957dacad5SJay Sternberg static void nvme_disable_io_queues(struct nvme_dev *dev) 272057dacad5SJay Sternberg { 272157dacad5SJay Sternberg int i; 272257dacad5SJay Sternberg DEFINE_KTHREAD_WORKER_ONSTACK(worker); 272357dacad5SJay Sternberg struct nvme_delq_ctx dq; 272457dacad5SJay Sternberg struct task_struct *kworker_task = kthread_run(kthread_worker_fn, 272557dacad5SJay Sternberg &worker, "nvme%d", dev->instance); 272657dacad5SJay Sternberg 272757dacad5SJay Sternberg if (IS_ERR(kworker_task)) { 272857dacad5SJay Sternberg dev_err(dev->dev, 272957dacad5SJay Sternberg "Failed to create queue del task\n"); 273057dacad5SJay Sternberg for (i = dev->queue_count - 1; i > 0; i--) 273157dacad5SJay Sternberg nvme_disable_queue(dev, i); 273257dacad5SJay Sternberg return; 273357dacad5SJay Sternberg } 273457dacad5SJay Sternberg 273557dacad5SJay Sternberg dq.waiter = NULL; 273657dacad5SJay Sternberg atomic_set(&dq.refcount, 0); 273757dacad5SJay Sternberg dq.worker = &worker; 273857dacad5SJay Sternberg for (i = dev->queue_count - 1; i > 0; i--) { 273957dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 274057dacad5SJay Sternberg 274157dacad5SJay Sternberg if (nvme_suspend_queue(nvmeq)) 274257dacad5SJay Sternberg continue; 274357dacad5SJay Sternberg nvmeq->cmdinfo.ctx = nvme_get_dq(&dq); 274457dacad5SJay Sternberg nvmeq->cmdinfo.worker = dq.worker; 274557dacad5SJay Sternberg init_kthread_work(&nvmeq->cmdinfo.work, nvme_del_queue_start); 274657dacad5SJay Sternberg queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work); 274757dacad5SJay Sternberg } 274857dacad5SJay Sternberg nvme_wait_dq(&dq, dev); 274957dacad5SJay Sternberg kthread_stop(kworker_task); 275057dacad5SJay Sternberg } 275157dacad5SJay Sternberg 275257dacad5SJay Sternberg /* 275357dacad5SJay Sternberg * Remove the node from the device list and check 275457dacad5SJay Sternberg * for whether or not we need to stop the nvme_thread. 275557dacad5SJay Sternberg */ 275657dacad5SJay Sternberg static void nvme_dev_list_remove(struct nvme_dev *dev) 275757dacad5SJay Sternberg { 275857dacad5SJay Sternberg struct task_struct *tmp = NULL; 275957dacad5SJay Sternberg 276057dacad5SJay Sternberg spin_lock(&dev_list_lock); 276157dacad5SJay Sternberg list_del_init(&dev->node); 276257dacad5SJay Sternberg if (list_empty(&dev_list) && !IS_ERR_OR_NULL(nvme_thread)) { 276357dacad5SJay Sternberg tmp = nvme_thread; 276457dacad5SJay Sternberg nvme_thread = NULL; 276557dacad5SJay Sternberg } 276657dacad5SJay Sternberg spin_unlock(&dev_list_lock); 276757dacad5SJay Sternberg 276857dacad5SJay Sternberg if (tmp) 276957dacad5SJay Sternberg kthread_stop(tmp); 277057dacad5SJay Sternberg } 277157dacad5SJay Sternberg 277257dacad5SJay Sternberg static void nvme_freeze_queues(struct nvme_dev *dev) 277357dacad5SJay Sternberg { 277457dacad5SJay Sternberg struct nvme_ns *ns; 277557dacad5SJay Sternberg 277657dacad5SJay Sternberg list_for_each_entry(ns, &dev->namespaces, list) { 277757dacad5SJay Sternberg blk_mq_freeze_queue_start(ns->queue); 277857dacad5SJay Sternberg 277957dacad5SJay Sternberg spin_lock_irq(ns->queue->queue_lock); 278057dacad5SJay Sternberg queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); 278157dacad5SJay Sternberg spin_unlock_irq(ns->queue->queue_lock); 278257dacad5SJay Sternberg 278357dacad5SJay Sternberg blk_mq_cancel_requeue_work(ns->queue); 278457dacad5SJay Sternberg blk_mq_stop_hw_queues(ns->queue); 278557dacad5SJay Sternberg } 278657dacad5SJay Sternberg } 278757dacad5SJay Sternberg 278857dacad5SJay Sternberg static void nvme_unfreeze_queues(struct nvme_dev *dev) 278957dacad5SJay Sternberg { 279057dacad5SJay Sternberg struct nvme_ns *ns; 279157dacad5SJay Sternberg 279257dacad5SJay Sternberg list_for_each_entry(ns, &dev->namespaces, list) { 279357dacad5SJay Sternberg queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); 279457dacad5SJay Sternberg blk_mq_unfreeze_queue(ns->queue); 279557dacad5SJay Sternberg blk_mq_start_stopped_hw_queues(ns->queue, true); 279657dacad5SJay Sternberg blk_mq_kick_requeue_list(ns->queue); 279757dacad5SJay Sternberg } 279857dacad5SJay Sternberg } 279957dacad5SJay Sternberg 280057dacad5SJay Sternberg static void nvme_dev_shutdown(struct nvme_dev *dev) 280157dacad5SJay Sternberg { 280257dacad5SJay Sternberg int i; 280357dacad5SJay Sternberg u32 csts = -1; 280457dacad5SJay Sternberg 280557dacad5SJay Sternberg nvme_dev_list_remove(dev); 280657dacad5SJay Sternberg 280757dacad5SJay Sternberg if (dev->bar) { 280857dacad5SJay Sternberg nvme_freeze_queues(dev); 280957dacad5SJay Sternberg csts = readl(&dev->bar->csts); 281057dacad5SJay Sternberg } 281157dacad5SJay Sternberg if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) { 281257dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= 0; i--) { 281357dacad5SJay Sternberg struct nvme_queue *nvmeq = dev->queues[i]; 281457dacad5SJay Sternberg nvme_suspend_queue(nvmeq); 281557dacad5SJay Sternberg } 281657dacad5SJay Sternberg } else { 281757dacad5SJay Sternberg nvme_disable_io_queues(dev); 281857dacad5SJay Sternberg nvme_shutdown_ctrl(dev); 281957dacad5SJay Sternberg nvme_disable_queue(dev, 0); 282057dacad5SJay Sternberg } 282157dacad5SJay Sternberg nvme_dev_unmap(dev); 282257dacad5SJay Sternberg 282357dacad5SJay Sternberg for (i = dev->queue_count - 1; i >= 0; i--) 282457dacad5SJay Sternberg nvme_clear_queue(dev->queues[i]); 282557dacad5SJay Sternberg } 282657dacad5SJay Sternberg 282757dacad5SJay Sternberg static void nvme_dev_remove(struct nvme_dev *dev) 282857dacad5SJay Sternberg { 282957dacad5SJay Sternberg struct nvme_ns *ns, *next; 283057dacad5SJay Sternberg 283157dacad5SJay Sternberg list_for_each_entry_safe(ns, next, &dev->namespaces, list) 283257dacad5SJay Sternberg nvme_ns_remove(ns); 283357dacad5SJay Sternberg } 283457dacad5SJay Sternberg 283557dacad5SJay Sternberg static int nvme_setup_prp_pools(struct nvme_dev *dev) 283657dacad5SJay Sternberg { 283757dacad5SJay Sternberg dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, 283857dacad5SJay Sternberg PAGE_SIZE, PAGE_SIZE, 0); 283957dacad5SJay Sternberg if (!dev->prp_page_pool) 284057dacad5SJay Sternberg return -ENOMEM; 284157dacad5SJay Sternberg 284257dacad5SJay Sternberg /* Optimisation for I/Os between 4k and 128k */ 284357dacad5SJay Sternberg dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, 284457dacad5SJay Sternberg 256, 256, 0); 284557dacad5SJay Sternberg if (!dev->prp_small_pool) { 284657dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 284757dacad5SJay Sternberg return -ENOMEM; 284857dacad5SJay Sternberg } 284957dacad5SJay Sternberg return 0; 285057dacad5SJay Sternberg } 285157dacad5SJay Sternberg 285257dacad5SJay Sternberg static void nvme_release_prp_pools(struct nvme_dev *dev) 285357dacad5SJay Sternberg { 285457dacad5SJay Sternberg dma_pool_destroy(dev->prp_page_pool); 285557dacad5SJay Sternberg dma_pool_destroy(dev->prp_small_pool); 285657dacad5SJay Sternberg } 285757dacad5SJay Sternberg 285857dacad5SJay Sternberg static DEFINE_IDA(nvme_instance_ida); 285957dacad5SJay Sternberg 286057dacad5SJay Sternberg static int nvme_set_instance(struct nvme_dev *dev) 286157dacad5SJay Sternberg { 286257dacad5SJay Sternberg int instance, error; 286357dacad5SJay Sternberg 286457dacad5SJay Sternberg do { 286557dacad5SJay Sternberg if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) 286657dacad5SJay Sternberg return -ENODEV; 286757dacad5SJay Sternberg 286857dacad5SJay Sternberg spin_lock(&dev_list_lock); 286957dacad5SJay Sternberg error = ida_get_new(&nvme_instance_ida, &instance); 287057dacad5SJay Sternberg spin_unlock(&dev_list_lock); 287157dacad5SJay Sternberg } while (error == -EAGAIN); 287257dacad5SJay Sternberg 287357dacad5SJay Sternberg if (error) 287457dacad5SJay Sternberg return -ENODEV; 287557dacad5SJay Sternberg 287657dacad5SJay Sternberg dev->instance = instance; 287757dacad5SJay Sternberg return 0; 287857dacad5SJay Sternberg } 287957dacad5SJay Sternberg 288057dacad5SJay Sternberg static void nvme_release_instance(struct nvme_dev *dev) 288157dacad5SJay Sternberg { 288257dacad5SJay Sternberg spin_lock(&dev_list_lock); 288357dacad5SJay Sternberg ida_remove(&nvme_instance_ida, dev->instance); 288457dacad5SJay Sternberg spin_unlock(&dev_list_lock); 288557dacad5SJay Sternberg } 288657dacad5SJay Sternberg 288757dacad5SJay Sternberg static void nvme_free_dev(struct kref *kref) 288857dacad5SJay Sternberg { 288957dacad5SJay Sternberg struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref); 289057dacad5SJay Sternberg 289157dacad5SJay Sternberg put_device(dev->dev); 289257dacad5SJay Sternberg put_device(dev->device); 289357dacad5SJay Sternberg nvme_release_instance(dev); 289457dacad5SJay Sternberg if (dev->tagset.tags) 289557dacad5SJay Sternberg blk_mq_free_tag_set(&dev->tagset); 289657dacad5SJay Sternberg if (dev->admin_q) 289757dacad5SJay Sternberg blk_put_queue(dev->admin_q); 289857dacad5SJay Sternberg kfree(dev->queues); 289957dacad5SJay Sternberg kfree(dev->entry); 290057dacad5SJay Sternberg kfree(dev); 290157dacad5SJay Sternberg } 290257dacad5SJay Sternberg 290357dacad5SJay Sternberg static int nvme_dev_open(struct inode *inode, struct file *f) 290457dacad5SJay Sternberg { 290557dacad5SJay Sternberg struct nvme_dev *dev; 290657dacad5SJay Sternberg int instance = iminor(inode); 290757dacad5SJay Sternberg int ret = -ENODEV; 290857dacad5SJay Sternberg 290957dacad5SJay Sternberg spin_lock(&dev_list_lock); 291057dacad5SJay Sternberg list_for_each_entry(dev, &dev_list, node) { 291157dacad5SJay Sternberg if (dev->instance == instance) { 291257dacad5SJay Sternberg if (!dev->admin_q) { 291357dacad5SJay Sternberg ret = -EWOULDBLOCK; 291457dacad5SJay Sternberg break; 291557dacad5SJay Sternberg } 291657dacad5SJay Sternberg if (!kref_get_unless_zero(&dev->kref)) 291757dacad5SJay Sternberg break; 291857dacad5SJay Sternberg f->private_data = dev; 291957dacad5SJay Sternberg ret = 0; 292057dacad5SJay Sternberg break; 292157dacad5SJay Sternberg } 292257dacad5SJay Sternberg } 292357dacad5SJay Sternberg spin_unlock(&dev_list_lock); 292457dacad5SJay Sternberg 292557dacad5SJay Sternberg return ret; 292657dacad5SJay Sternberg } 292757dacad5SJay Sternberg 292857dacad5SJay Sternberg static int nvme_dev_release(struct inode *inode, struct file *f) 292957dacad5SJay Sternberg { 293057dacad5SJay Sternberg struct nvme_dev *dev = f->private_data; 293157dacad5SJay Sternberg kref_put(&dev->kref, nvme_free_dev); 293257dacad5SJay Sternberg return 0; 293357dacad5SJay Sternberg } 293457dacad5SJay Sternberg 293557dacad5SJay Sternberg static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg) 293657dacad5SJay Sternberg { 293757dacad5SJay Sternberg struct nvme_dev *dev = f->private_data; 293857dacad5SJay Sternberg struct nvme_ns *ns; 293957dacad5SJay Sternberg 294057dacad5SJay Sternberg switch (cmd) { 294157dacad5SJay Sternberg case NVME_IOCTL_ADMIN_CMD: 294257dacad5SJay Sternberg return nvme_user_cmd(dev, NULL, (void __user *)arg); 294357dacad5SJay Sternberg case NVME_IOCTL_IO_CMD: 294457dacad5SJay Sternberg if (list_empty(&dev->namespaces)) 294557dacad5SJay Sternberg return -ENOTTY; 294657dacad5SJay Sternberg ns = list_first_entry(&dev->namespaces, struct nvme_ns, list); 294757dacad5SJay Sternberg return nvme_user_cmd(dev, ns, (void __user *)arg); 294857dacad5SJay Sternberg case NVME_IOCTL_RESET: 294957dacad5SJay Sternberg dev_warn(dev->dev, "resetting controller\n"); 295057dacad5SJay Sternberg return nvme_reset(dev); 295157dacad5SJay Sternberg case NVME_IOCTL_SUBSYS_RESET: 295257dacad5SJay Sternberg return nvme_subsys_reset(dev); 295357dacad5SJay Sternberg default: 295457dacad5SJay Sternberg return -ENOTTY; 295557dacad5SJay Sternberg } 295657dacad5SJay Sternberg } 295757dacad5SJay Sternberg 295857dacad5SJay Sternberg static const struct file_operations nvme_dev_fops = { 295957dacad5SJay Sternberg .owner = THIS_MODULE, 296057dacad5SJay Sternberg .open = nvme_dev_open, 296157dacad5SJay Sternberg .release = nvme_dev_release, 296257dacad5SJay Sternberg .unlocked_ioctl = nvme_dev_ioctl, 296357dacad5SJay Sternberg .compat_ioctl = nvme_dev_ioctl, 296457dacad5SJay Sternberg }; 296557dacad5SJay Sternberg 296657dacad5SJay Sternberg static void nvme_probe_work(struct work_struct *work) 296757dacad5SJay Sternberg { 296857dacad5SJay Sternberg struct nvme_dev *dev = container_of(work, struct nvme_dev, probe_work); 296957dacad5SJay Sternberg bool start_thread = false; 297057dacad5SJay Sternberg int result; 297157dacad5SJay Sternberg 297257dacad5SJay Sternberg result = nvme_dev_map(dev); 297357dacad5SJay Sternberg if (result) 297457dacad5SJay Sternberg goto out; 297557dacad5SJay Sternberg 297657dacad5SJay Sternberg result = nvme_configure_admin_queue(dev); 297757dacad5SJay Sternberg if (result) 297857dacad5SJay Sternberg goto unmap; 297957dacad5SJay Sternberg 298057dacad5SJay Sternberg spin_lock(&dev_list_lock); 298157dacad5SJay Sternberg if (list_empty(&dev_list) && IS_ERR_OR_NULL(nvme_thread)) { 298257dacad5SJay Sternberg start_thread = true; 298357dacad5SJay Sternberg nvme_thread = NULL; 298457dacad5SJay Sternberg } 298557dacad5SJay Sternberg list_add(&dev->node, &dev_list); 298657dacad5SJay Sternberg spin_unlock(&dev_list_lock); 298757dacad5SJay Sternberg 298857dacad5SJay Sternberg if (start_thread) { 298957dacad5SJay Sternberg nvme_thread = kthread_run(nvme_kthread, NULL, "nvme"); 299057dacad5SJay Sternberg wake_up_all(&nvme_kthread_wait); 299157dacad5SJay Sternberg } else 299257dacad5SJay Sternberg wait_event_killable(nvme_kthread_wait, nvme_thread); 299357dacad5SJay Sternberg 299457dacad5SJay Sternberg if (IS_ERR_OR_NULL(nvme_thread)) { 299557dacad5SJay Sternberg result = nvme_thread ? PTR_ERR(nvme_thread) : -EINTR; 299657dacad5SJay Sternberg goto disable; 299757dacad5SJay Sternberg } 299857dacad5SJay Sternberg 299957dacad5SJay Sternberg nvme_init_queue(dev->queues[0], 0); 300057dacad5SJay Sternberg result = nvme_alloc_admin_tags(dev); 300157dacad5SJay Sternberg if (result) 300257dacad5SJay Sternberg goto disable; 300357dacad5SJay Sternberg 300457dacad5SJay Sternberg result = nvme_setup_io_queues(dev); 300557dacad5SJay Sternberg if (result) 300657dacad5SJay Sternberg goto free_tags; 300757dacad5SJay Sternberg 300857dacad5SJay Sternberg dev->event_limit = 1; 300957dacad5SJay Sternberg 301057dacad5SJay Sternberg /* 301157dacad5SJay Sternberg * Keep the controller around but remove all namespaces if we don't have 301257dacad5SJay Sternberg * any working I/O queue. 301357dacad5SJay Sternberg */ 301457dacad5SJay Sternberg if (dev->online_queues < 2) { 301557dacad5SJay Sternberg dev_warn(dev->dev, "IO queues not created\n"); 301657dacad5SJay Sternberg nvme_dev_remove(dev); 301757dacad5SJay Sternberg } else { 301857dacad5SJay Sternberg nvme_unfreeze_queues(dev); 301957dacad5SJay Sternberg nvme_dev_add(dev); 302057dacad5SJay Sternberg } 302157dacad5SJay Sternberg 302257dacad5SJay Sternberg return; 302357dacad5SJay Sternberg 302457dacad5SJay Sternberg free_tags: 302557dacad5SJay Sternberg nvme_dev_remove_admin(dev); 302657dacad5SJay Sternberg blk_put_queue(dev->admin_q); 302757dacad5SJay Sternberg dev->admin_q = NULL; 302857dacad5SJay Sternberg dev->queues[0]->tags = NULL; 302957dacad5SJay Sternberg disable: 303057dacad5SJay Sternberg nvme_disable_queue(dev, 0); 303157dacad5SJay Sternberg nvme_dev_list_remove(dev); 303257dacad5SJay Sternberg unmap: 303357dacad5SJay Sternberg nvme_dev_unmap(dev); 303457dacad5SJay Sternberg out: 303557dacad5SJay Sternberg if (!work_busy(&dev->reset_work)) 303657dacad5SJay Sternberg nvme_dead_ctrl(dev); 303757dacad5SJay Sternberg } 303857dacad5SJay Sternberg 303957dacad5SJay Sternberg static int nvme_remove_dead_ctrl(void *arg) 304057dacad5SJay Sternberg { 304157dacad5SJay Sternberg struct nvme_dev *dev = (struct nvme_dev *)arg; 304257dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev->dev); 304357dacad5SJay Sternberg 304457dacad5SJay Sternberg if (pci_get_drvdata(pdev)) 304557dacad5SJay Sternberg pci_stop_and_remove_bus_device_locked(pdev); 304657dacad5SJay Sternberg kref_put(&dev->kref, nvme_free_dev); 304757dacad5SJay Sternberg return 0; 304857dacad5SJay Sternberg } 304957dacad5SJay Sternberg 305057dacad5SJay Sternberg static void nvme_dead_ctrl(struct nvme_dev *dev) 305157dacad5SJay Sternberg { 305257dacad5SJay Sternberg dev_warn(dev->dev, "Device failed to resume\n"); 305357dacad5SJay Sternberg kref_get(&dev->kref); 305457dacad5SJay Sternberg if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d", 305557dacad5SJay Sternberg dev->instance))) { 305657dacad5SJay Sternberg dev_err(dev->dev, 305757dacad5SJay Sternberg "Failed to start controller remove task\n"); 305857dacad5SJay Sternberg kref_put(&dev->kref, nvme_free_dev); 305957dacad5SJay Sternberg } 306057dacad5SJay Sternberg } 306157dacad5SJay Sternberg 306257dacad5SJay Sternberg static void nvme_reset_work(struct work_struct *ws) 306357dacad5SJay Sternberg { 306457dacad5SJay Sternberg struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work); 306557dacad5SJay Sternberg bool in_probe = work_busy(&dev->probe_work); 306657dacad5SJay Sternberg 306757dacad5SJay Sternberg nvme_dev_shutdown(dev); 306857dacad5SJay Sternberg 306957dacad5SJay Sternberg /* Synchronize with device probe so that work will see failure status 307057dacad5SJay Sternberg * and exit gracefully without trying to schedule another reset */ 307157dacad5SJay Sternberg flush_work(&dev->probe_work); 307257dacad5SJay Sternberg 307357dacad5SJay Sternberg /* Fail this device if reset occured during probe to avoid 307457dacad5SJay Sternberg * infinite initialization loops. */ 307557dacad5SJay Sternberg if (in_probe) { 307657dacad5SJay Sternberg nvme_dead_ctrl(dev); 307757dacad5SJay Sternberg return; 307857dacad5SJay Sternberg } 307957dacad5SJay Sternberg /* Schedule device resume asynchronously so the reset work is available 308057dacad5SJay Sternberg * to cleanup errors that may occur during reinitialization */ 308157dacad5SJay Sternberg schedule_work(&dev->probe_work); 308257dacad5SJay Sternberg } 308357dacad5SJay Sternberg 308457dacad5SJay Sternberg static int __nvme_reset(struct nvme_dev *dev) 308557dacad5SJay Sternberg { 308657dacad5SJay Sternberg if (work_pending(&dev->reset_work)) 308757dacad5SJay Sternberg return -EBUSY; 308857dacad5SJay Sternberg list_del_init(&dev->node); 308957dacad5SJay Sternberg queue_work(nvme_workq, &dev->reset_work); 309057dacad5SJay Sternberg return 0; 309157dacad5SJay Sternberg } 309257dacad5SJay Sternberg 309357dacad5SJay Sternberg static int nvme_reset(struct nvme_dev *dev) 309457dacad5SJay Sternberg { 309557dacad5SJay Sternberg int ret; 309657dacad5SJay Sternberg 309757dacad5SJay Sternberg if (!dev->admin_q || blk_queue_dying(dev->admin_q)) 309857dacad5SJay Sternberg return -ENODEV; 309957dacad5SJay Sternberg 310057dacad5SJay Sternberg spin_lock(&dev_list_lock); 310157dacad5SJay Sternberg ret = __nvme_reset(dev); 310257dacad5SJay Sternberg spin_unlock(&dev_list_lock); 310357dacad5SJay Sternberg 310457dacad5SJay Sternberg if (!ret) { 310557dacad5SJay Sternberg flush_work(&dev->reset_work); 310657dacad5SJay Sternberg flush_work(&dev->probe_work); 310757dacad5SJay Sternberg return 0; 310857dacad5SJay Sternberg } 310957dacad5SJay Sternberg 311057dacad5SJay Sternberg return ret; 311157dacad5SJay Sternberg } 311257dacad5SJay Sternberg 311357dacad5SJay Sternberg static ssize_t nvme_sysfs_reset(struct device *dev, 311457dacad5SJay Sternberg struct device_attribute *attr, const char *buf, 311557dacad5SJay Sternberg size_t count) 311657dacad5SJay Sternberg { 311757dacad5SJay Sternberg struct nvme_dev *ndev = dev_get_drvdata(dev); 311857dacad5SJay Sternberg int ret; 311957dacad5SJay Sternberg 312057dacad5SJay Sternberg ret = nvme_reset(ndev); 312157dacad5SJay Sternberg if (ret < 0) 312257dacad5SJay Sternberg return ret; 312357dacad5SJay Sternberg 312457dacad5SJay Sternberg return count; 312557dacad5SJay Sternberg } 312657dacad5SJay Sternberg static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); 312757dacad5SJay Sternberg 312857dacad5SJay Sternberg static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 312957dacad5SJay Sternberg { 313057dacad5SJay Sternberg int node, result = -ENOMEM; 313157dacad5SJay Sternberg struct nvme_dev *dev; 313257dacad5SJay Sternberg 313357dacad5SJay Sternberg node = dev_to_node(&pdev->dev); 313457dacad5SJay Sternberg if (node == NUMA_NO_NODE) 313557dacad5SJay Sternberg set_dev_node(&pdev->dev, 0); 313657dacad5SJay Sternberg 313757dacad5SJay Sternberg dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); 313857dacad5SJay Sternberg if (!dev) 313957dacad5SJay Sternberg return -ENOMEM; 314057dacad5SJay Sternberg dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry), 314157dacad5SJay Sternberg GFP_KERNEL, node); 314257dacad5SJay Sternberg if (!dev->entry) 314357dacad5SJay Sternberg goto free; 314457dacad5SJay Sternberg dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), 314557dacad5SJay Sternberg GFP_KERNEL, node); 314657dacad5SJay Sternberg if (!dev->queues) 314757dacad5SJay Sternberg goto free; 314857dacad5SJay Sternberg 314957dacad5SJay Sternberg INIT_LIST_HEAD(&dev->namespaces); 315057dacad5SJay Sternberg INIT_WORK(&dev->reset_work, nvme_reset_work); 315157dacad5SJay Sternberg dev->dev = get_device(&pdev->dev); 315257dacad5SJay Sternberg pci_set_drvdata(pdev, dev); 315357dacad5SJay Sternberg result = nvme_set_instance(dev); 315457dacad5SJay Sternberg if (result) 315557dacad5SJay Sternberg goto put_pci; 315657dacad5SJay Sternberg 315757dacad5SJay Sternberg result = nvme_setup_prp_pools(dev); 315857dacad5SJay Sternberg if (result) 315957dacad5SJay Sternberg goto release; 316057dacad5SJay Sternberg 316157dacad5SJay Sternberg kref_init(&dev->kref); 316257dacad5SJay Sternberg dev->device = device_create(nvme_class, &pdev->dev, 316357dacad5SJay Sternberg MKDEV(nvme_char_major, dev->instance), 316457dacad5SJay Sternberg dev, "nvme%d", dev->instance); 316557dacad5SJay Sternberg if (IS_ERR(dev->device)) { 316657dacad5SJay Sternberg result = PTR_ERR(dev->device); 316757dacad5SJay Sternberg goto release_pools; 316857dacad5SJay Sternberg } 316957dacad5SJay Sternberg get_device(dev->device); 317057dacad5SJay Sternberg dev_set_drvdata(dev->device, dev); 317157dacad5SJay Sternberg 317257dacad5SJay Sternberg result = device_create_file(dev->device, &dev_attr_reset_controller); 317357dacad5SJay Sternberg if (result) 317457dacad5SJay Sternberg goto put_dev; 317557dacad5SJay Sternberg 317657dacad5SJay Sternberg INIT_LIST_HEAD(&dev->node); 317757dacad5SJay Sternberg INIT_WORK(&dev->scan_work, nvme_dev_scan); 317857dacad5SJay Sternberg INIT_WORK(&dev->probe_work, nvme_probe_work); 317957dacad5SJay Sternberg schedule_work(&dev->probe_work); 318057dacad5SJay Sternberg return 0; 318157dacad5SJay Sternberg 318257dacad5SJay Sternberg put_dev: 318357dacad5SJay Sternberg device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance)); 318457dacad5SJay Sternberg put_device(dev->device); 318557dacad5SJay Sternberg release_pools: 318657dacad5SJay Sternberg nvme_release_prp_pools(dev); 318757dacad5SJay Sternberg release: 318857dacad5SJay Sternberg nvme_release_instance(dev); 318957dacad5SJay Sternberg put_pci: 319057dacad5SJay Sternberg put_device(dev->dev); 319157dacad5SJay Sternberg free: 319257dacad5SJay Sternberg kfree(dev->queues); 319357dacad5SJay Sternberg kfree(dev->entry); 319457dacad5SJay Sternberg kfree(dev); 319557dacad5SJay Sternberg return result; 319657dacad5SJay Sternberg } 319757dacad5SJay Sternberg 319857dacad5SJay Sternberg static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) 319957dacad5SJay Sternberg { 320057dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 320157dacad5SJay Sternberg 320257dacad5SJay Sternberg if (prepare) 320357dacad5SJay Sternberg nvme_dev_shutdown(dev); 320457dacad5SJay Sternberg else 320557dacad5SJay Sternberg schedule_work(&dev->probe_work); 320657dacad5SJay Sternberg } 320757dacad5SJay Sternberg 320857dacad5SJay Sternberg static void nvme_shutdown(struct pci_dev *pdev) 320957dacad5SJay Sternberg { 321057dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 321157dacad5SJay Sternberg nvme_dev_shutdown(dev); 321257dacad5SJay Sternberg } 321357dacad5SJay Sternberg 321457dacad5SJay Sternberg static void nvme_remove(struct pci_dev *pdev) 321557dacad5SJay Sternberg { 321657dacad5SJay Sternberg struct nvme_dev *dev = pci_get_drvdata(pdev); 321757dacad5SJay Sternberg 321857dacad5SJay Sternberg spin_lock(&dev_list_lock); 321957dacad5SJay Sternberg list_del_init(&dev->node); 322057dacad5SJay Sternberg spin_unlock(&dev_list_lock); 322157dacad5SJay Sternberg 322257dacad5SJay Sternberg pci_set_drvdata(pdev, NULL); 322357dacad5SJay Sternberg flush_work(&dev->probe_work); 322457dacad5SJay Sternberg flush_work(&dev->reset_work); 322557dacad5SJay Sternberg flush_work(&dev->scan_work); 322657dacad5SJay Sternberg device_remove_file(dev->device, &dev_attr_reset_controller); 322757dacad5SJay Sternberg nvme_dev_remove(dev); 322857dacad5SJay Sternberg nvme_dev_shutdown(dev); 322957dacad5SJay Sternberg nvme_dev_remove_admin(dev); 323057dacad5SJay Sternberg device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance)); 323157dacad5SJay Sternberg nvme_free_queues(dev, 0); 323257dacad5SJay Sternberg nvme_release_cmb(dev); 323357dacad5SJay Sternberg nvme_release_prp_pools(dev); 323457dacad5SJay Sternberg kref_put(&dev->kref, nvme_free_dev); 323557dacad5SJay Sternberg } 323657dacad5SJay Sternberg 323757dacad5SJay Sternberg /* These functions are yet to be implemented */ 323857dacad5SJay Sternberg #define nvme_error_detected NULL 323957dacad5SJay Sternberg #define nvme_dump_registers NULL 324057dacad5SJay Sternberg #define nvme_link_reset NULL 324157dacad5SJay Sternberg #define nvme_slot_reset NULL 324257dacad5SJay Sternberg #define nvme_error_resume NULL 324357dacad5SJay Sternberg 324457dacad5SJay Sternberg #ifdef CONFIG_PM_SLEEP 324557dacad5SJay Sternberg static int nvme_suspend(struct device *dev) 324657dacad5SJay Sternberg { 324757dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 324857dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 324957dacad5SJay Sternberg 325057dacad5SJay Sternberg nvme_dev_shutdown(ndev); 325157dacad5SJay Sternberg return 0; 325257dacad5SJay Sternberg } 325357dacad5SJay Sternberg 325457dacad5SJay Sternberg static int nvme_resume(struct device *dev) 325557dacad5SJay Sternberg { 325657dacad5SJay Sternberg struct pci_dev *pdev = to_pci_dev(dev); 325757dacad5SJay Sternberg struct nvme_dev *ndev = pci_get_drvdata(pdev); 325857dacad5SJay Sternberg 325957dacad5SJay Sternberg schedule_work(&ndev->probe_work); 326057dacad5SJay Sternberg return 0; 326157dacad5SJay Sternberg } 326257dacad5SJay Sternberg #endif 326357dacad5SJay Sternberg 326457dacad5SJay Sternberg static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); 326557dacad5SJay Sternberg 326657dacad5SJay Sternberg static const struct pci_error_handlers nvme_err_handler = { 326757dacad5SJay Sternberg .error_detected = nvme_error_detected, 326857dacad5SJay Sternberg .mmio_enabled = nvme_dump_registers, 326957dacad5SJay Sternberg .link_reset = nvme_link_reset, 327057dacad5SJay Sternberg .slot_reset = nvme_slot_reset, 327157dacad5SJay Sternberg .resume = nvme_error_resume, 327257dacad5SJay Sternberg .reset_notify = nvme_reset_notify, 327357dacad5SJay Sternberg }; 327457dacad5SJay Sternberg 327557dacad5SJay Sternberg /* Move to pci_ids.h later */ 327657dacad5SJay Sternberg #define PCI_CLASS_STORAGE_EXPRESS 0x010802 327757dacad5SJay Sternberg 327857dacad5SJay Sternberg static const struct pci_device_id nvme_id_table[] = { 327957dacad5SJay Sternberg { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, 328057dacad5SJay Sternberg { 0, } 328157dacad5SJay Sternberg }; 328257dacad5SJay Sternberg MODULE_DEVICE_TABLE(pci, nvme_id_table); 328357dacad5SJay Sternberg 328457dacad5SJay Sternberg static struct pci_driver nvme_driver = { 328557dacad5SJay Sternberg .name = "nvme", 328657dacad5SJay Sternberg .id_table = nvme_id_table, 328757dacad5SJay Sternberg .probe = nvme_probe, 328857dacad5SJay Sternberg .remove = nvme_remove, 328957dacad5SJay Sternberg .shutdown = nvme_shutdown, 329057dacad5SJay Sternberg .driver = { 329157dacad5SJay Sternberg .pm = &nvme_dev_pm_ops, 329257dacad5SJay Sternberg }, 329357dacad5SJay Sternberg .err_handler = &nvme_err_handler, 329457dacad5SJay Sternberg }; 329557dacad5SJay Sternberg 329657dacad5SJay Sternberg static int __init nvme_init(void) 329757dacad5SJay Sternberg { 329857dacad5SJay Sternberg int result; 329957dacad5SJay Sternberg 330057dacad5SJay Sternberg init_waitqueue_head(&nvme_kthread_wait); 330157dacad5SJay Sternberg 330257dacad5SJay Sternberg nvme_workq = create_singlethread_workqueue("nvme"); 330357dacad5SJay Sternberg if (!nvme_workq) 330457dacad5SJay Sternberg return -ENOMEM; 330557dacad5SJay Sternberg 330657dacad5SJay Sternberg result = register_blkdev(nvme_major, "nvme"); 330757dacad5SJay Sternberg if (result < 0) 330857dacad5SJay Sternberg goto kill_workq; 330957dacad5SJay Sternberg else if (result > 0) 331057dacad5SJay Sternberg nvme_major = result; 331157dacad5SJay Sternberg 331257dacad5SJay Sternberg result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme", 331357dacad5SJay Sternberg &nvme_dev_fops); 331457dacad5SJay Sternberg if (result < 0) 331557dacad5SJay Sternberg goto unregister_blkdev; 331657dacad5SJay Sternberg else if (result > 0) 331757dacad5SJay Sternberg nvme_char_major = result; 331857dacad5SJay Sternberg 331957dacad5SJay Sternberg nvme_class = class_create(THIS_MODULE, "nvme"); 332057dacad5SJay Sternberg if (IS_ERR(nvme_class)) { 332157dacad5SJay Sternberg result = PTR_ERR(nvme_class); 332257dacad5SJay Sternberg goto unregister_chrdev; 332357dacad5SJay Sternberg } 332457dacad5SJay Sternberg 332557dacad5SJay Sternberg result = pci_register_driver(&nvme_driver); 332657dacad5SJay Sternberg if (result) 332757dacad5SJay Sternberg goto destroy_class; 332857dacad5SJay Sternberg return 0; 332957dacad5SJay Sternberg 333057dacad5SJay Sternberg destroy_class: 333157dacad5SJay Sternberg class_destroy(nvme_class); 333257dacad5SJay Sternberg unregister_chrdev: 333357dacad5SJay Sternberg __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); 333457dacad5SJay Sternberg unregister_blkdev: 333557dacad5SJay Sternberg unregister_blkdev(nvme_major, "nvme"); 333657dacad5SJay Sternberg kill_workq: 333757dacad5SJay Sternberg destroy_workqueue(nvme_workq); 333857dacad5SJay Sternberg return result; 333957dacad5SJay Sternberg } 334057dacad5SJay Sternberg 334157dacad5SJay Sternberg static void __exit nvme_exit(void) 334257dacad5SJay Sternberg { 334357dacad5SJay Sternberg pci_unregister_driver(&nvme_driver); 334457dacad5SJay Sternberg unregister_blkdev(nvme_major, "nvme"); 334557dacad5SJay Sternberg destroy_workqueue(nvme_workq); 334657dacad5SJay Sternberg class_destroy(nvme_class); 334757dacad5SJay Sternberg __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); 334857dacad5SJay Sternberg BUG_ON(nvme_thread && !IS_ERR(nvme_thread)); 334957dacad5SJay Sternberg _nvme_check_size(); 335057dacad5SJay Sternberg } 335157dacad5SJay Sternberg 335257dacad5SJay Sternberg MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); 335357dacad5SJay Sternberg MODULE_LICENSE("GPL"); 335457dacad5SJay Sternberg MODULE_VERSION("1.0"); 335557dacad5SJay Sternberg module_init(nvme_init); 335657dacad5SJay Sternberg module_exit(nvme_exit); 3357