diff options
Diffstat (limited to 'drivers/block/nvme-core.c')
| -rw-r--r-- | drivers/block/nvme-core.c | 3391 |
1 files changed, 0 insertions, 3391 deletions
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c deleted file mode 100644 index 6f04771f1019..000000000000 --- a/drivers/block/nvme-core.c +++ /dev/null @@ -1,3391 +0,0 @@ -/* - * NVM Express device driver - * Copyright (c) 2011-2014, Intel Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - */ - -#include <linux/nvme.h> -#include <linux/bitops.h> -#include <linux/blkdev.h> -#include <linux/blk-mq.h> -#include <linux/cpu.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/genhd.h> -#include <linux/hdreg.h> -#include <linux/idr.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/kdev_t.h> -#include <linux/kthread.h> -#include <linux/kernel.h> -#include <linux/list_sort.h> -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/pci.h> -#include <linux/poison.h> -#include <linux/ptrace.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/t10-pi.h> -#include <linux/types.h> -#include <scsi/sg.h> -#include <asm-generic/io-64-nonatomic-lo-hi.h> - -#define NVME_MINORS (1U << MINORBITS) -#define NVME_Q_DEPTH 1024 -#define NVME_AQ_DEPTH 256 -#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) -#define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) -#define ADMIN_TIMEOUT (admin_timeout * HZ) -#define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ) - -static unsigned char admin_timeout = 60; -module_param(admin_timeout, byte, 0644); -MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); - -unsigned char nvme_io_timeout = 30; -module_param_named(io_timeout, nvme_io_timeout, byte, 0644); -MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); - -static unsigned char shutdown_timeout = 5; -module_param(shutdown_timeout, byte, 0644); -MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown"); - -static int nvme_major; -module_param(nvme_major, int, 0); - -static int nvme_char_major; -module_param(nvme_char_major, int, 0); - -static int use_threaded_interrupts; -module_param(use_threaded_interrupts, int, 0); - -static bool use_cmb_sqes = true; -module_param(use_cmb_sqes, bool, 0644); -MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); - -static DEFINE_SPINLOCK(dev_list_lock); -static LIST_HEAD(dev_list); -static struct task_struct *nvme_thread; -static struct workqueue_struct *nvme_workq; -static wait_queue_head_t nvme_kthread_wait; - -static struct class *nvme_class; - -static void nvme_reset_failed_dev(struct work_struct *ws); -static int nvme_reset(struct nvme_dev *dev); -static int nvme_process_cq(struct nvme_queue *nvmeq); - -struct async_cmd_info { - struct kthread_work work; - struct kthread_worker *worker; - struct request *req; - u32 result; - int status; - void *ctx; -}; - -/* - * An NVM Express queue. Each device has at least two (one for admin - * commands and one for I/O commands). - */ -struct nvme_queue { - struct device *q_dmadev; - struct nvme_dev *dev; - char irqname[24]; /* nvme4294967295-65535\0 */ - spinlock_t q_lock; - struct nvme_command *sq_cmds; - struct nvme_command __iomem *sq_cmds_io; - volatile struct nvme_completion *cqes; - struct blk_mq_tags **tags; - dma_addr_t sq_dma_addr; - dma_addr_t cq_dma_addr; - u32 __iomem *q_db; - u16 q_depth; - s16 cq_vector; - u16 sq_head; - u16 sq_tail; - u16 cq_head; - u16 qid; - u8 cq_phase; - u8 cqe_seen; - struct async_cmd_info cmdinfo; -}; - -/* - * Check we didin't inadvertently grow the command struct - */ -static inline void _nvme_check_size(void) -{ - BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64); - BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64); - BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64); - BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64); - BUILD_BUG_ON(sizeof(struct nvme_features) != 64); - BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); - BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); - BUILD_BUG_ON(sizeof(struct nvme_command) != 64); - BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096); - BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); - BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); - BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); -} - -typedef void (*nvme_completion_fn)(struct nvme_queue *, void *, - struct nvme_completion *); - -struct nvme_cmd_info { - nvme_completion_fn fn; - void *ctx; - int aborted; - struct nvme_queue *nvmeq; - struct nvme_iod iod[0]; -}; - -/* - * Max size of iod being embedded in the request payload - */ -#define NVME_INT_PAGES 2 -#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->page_size) -#define NVME_INT_MASK 0x01 - -/* - * Will slightly overestimate the number of pages needed. This is OK - * as it only leads to a small amount of wasted memory for the lifetime of - * the I/O. - */ -static int nvme_npages(unsigned size, struct nvme_dev *dev) -{ - unsigned nprps = DIV_ROUND_UP(size + dev->page_size, dev->page_size); - return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); -} - -static unsigned int nvme_cmd_size(struct nvme_dev *dev) -{ - unsigned int ret = sizeof(struct nvme_cmd_info); - - ret += sizeof(struct nvme_iod); - ret += sizeof(__le64 *) * nvme_npages(NVME_INT_BYTES(dev), dev); - ret += sizeof(struct scatterlist) * NVME_INT_PAGES; - - return ret; -} - -static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, - unsigned int hctx_idx) -{ - struct nvme_dev *dev = data; - struct nvme_queue *nvmeq = dev->queues[0]; - - WARN_ON(hctx_idx != 0); - WARN_ON(dev->admin_tagset.tags[0] != hctx->tags); - WARN_ON(nvmeq->tags); - - hctx->driver_data = nvmeq; - nvmeq->tags = &dev->admin_tagset.tags[0]; - return 0; -} - -static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) -{ - struct nvme_queue *nvmeq = hctx->driver_data; - - nvmeq->tags = NULL; -} - -static int nvme_admin_init_request(void *data, struct request *req, - unsigned int hctx_idx, unsigned int rq_idx, - unsigned int numa_node) -{ - struct nvme_dev *dev = data; - struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); - struct nvme_queue *nvmeq = dev->queues[0]; - - BUG_ON(!nvmeq); - cmd->nvmeq = nvmeq; - return 0; -} - -static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, - unsigned int hctx_idx) -{ - struct nvme_dev *dev = data; - struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; - - if (!nvmeq->tags) - nvmeq->tags = &dev->tagset.tags[hctx_idx]; - - WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags); - hctx->driver_data = nvmeq; - return 0; -} - -static int nvme_init_request(void *data, struct request *req, - unsigned int hctx_idx, unsigned int rq_idx, - unsigned int numa_node) -{ - struct nvme_dev *dev = data; - struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); - struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1]; - - BUG_ON(!nvmeq); - cmd->nvmeq = nvmeq; - return 0; -} - -static void nvme_set_info(struct nvme_cmd_info *cmd, void *ctx, - nvme_completion_fn handler) -{ - cmd->fn = handler; - cmd->ctx = ctx; - cmd->aborted = 0; - blk_mq_start_request(blk_mq_rq_from_pdu(cmd)); -} - -static void *iod_get_private(struct nvme_iod *iod) -{ - return (void *) (iod->private & ~0x1UL); -} - -/* - * If bit 0 is set, the iod is embedded in the request payload. - */ -static bool iod_should_kfree(struct nvme_iod *iod) -{ - return (iod->private & NVME_INT_MASK) == 0; -} - -/* Special values must be less than 0x1000 */ -#define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA) -#define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE) -#define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE) -#define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE) - -static void special_completion(struct nvme_queue *nvmeq, void *ctx, - struct nvme_completion *cqe) -{ - if (ctx == CMD_CTX_CANCELLED) - return; - if (ctx == CMD_CTX_COMPLETED) { - dev_warn(nvmeq->q_dmadev, - "completed id %d twice on queue %d\n", - cqe->command_id, le16_to_cpup(&cqe->sq_id)); - return; - } - if (ctx == CMD_CTX_INVALID) { - dev_warn(nvmeq->q_dmadev, - "invalid id %d completed on queue %d\n", - cqe->command_id, le16_to_cpup(&cqe->sq_id)); - return; - } - dev_warn(nvmeq->q_dmadev, "Unknown special completion %p\n", ctx); -} - -static void *cancel_cmd_info(struct nvme_cmd_info *cmd, nvme_completion_fn *fn) -{ - void *ctx; - - if (fn) - *fn = cmd->fn; - ctx = cmd->ctx; - cmd->fn = special_completion; - cmd->ctx = CMD_CTX_CANCELLED; - return ctx; -} - -static void async_req_completion(struct nvme_queue *nvmeq, void *ctx, - struct nvme_completion *cqe) -{ - u32 result = le32_to_cpup(&cqe->result); - u16 status = le16_to_cpup(&cqe->status) >> 1; - - if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) - ++nvmeq->dev->event_limit; - if (status != NVME_SC_SUCCESS) - return; - - switch (result & 0xff07) { - case NVME_AER_NOTICE_NS_CHANGED: - dev_info(nvmeq->q_dmadev, "rescanning\n"); - schedule_work(&nvmeq->dev->scan_work); - default: - dev_warn(nvmeq->q_dmadev, "async event result %08x\n", result); - } -} - -static void abort_completion(struct nvme_queue *nvmeq, void *ctx, - struct nvme_completion *cqe) -{ - struct request *req = ctx; - - u16 status = le16_to_cpup(&cqe->status) >> 1; - u32 result = le32_to_cpup(&cqe->result); - - blk_mq_free_request(req); - - dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status, result); - ++nvmeq->dev->abort_limit; -} - -static void async_completion(struct nvme_queue *nvmeq, void *ctx, - struct nvme_completion *cqe) -{ - struct async_cmd_info *cmdinfo = ctx; - cmdinfo->result = le32_to_cpup(&cqe->result); - cmdinfo->status = le16_to_cpup(&cqe->status) >> 1; - queue_kthread_work(cmdinfo->worker, &cmdinfo->work); - blk_mq_free_request(cmdinfo->req); -} - -static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq, - unsigned int tag) -{ - struct request *req = blk_mq_tag_to_rq(*nvmeq->tags, tag); - - return blk_mq_rq_to_pdu(req); -} - -/* - * Called with local interrupts disabled and the q_lock held. May not sleep. - */ -static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag, - nvme_completion_fn *fn) -{ - struct nvme_cmd_info *cmd = get_cmd_from_tag(nvmeq, tag); - void *ctx; - if (tag >= nvmeq->q_depth) { - *fn = special_completion; - return CMD_CTX_INVALID; - } - if (fn) - *fn = cmd->fn; - ctx = cmd->ctx; - cmd->fn = special_completion; - cmd->ctx = CMD_CTX_COMPLETED; - return ctx; -} - -/** - * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell - * @nvmeq: The queue to use - * @cmd: The command to send - * - * Safe to use from interrupt context - */ -static void __nvme_submit_cmd(struct nvme_queue *nvmeq, - struct nvme_command *cmd) -{ - u16 tail = nvmeq->sq_tail; - - if (nvmeq->sq_cmds_io) - memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); - else - memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); - - if (++tail == nvmeq->q_depth) - tail = 0; - writel(tail, nvmeq->q_db); - nvmeq->sq_tail = tail; -} - -static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) -{ - unsigned long flags; - spin_lock_irqsave(&nvmeq->q_lock, flags); - __nvme_submit_cmd(nvmeq, cmd); - spin_unlock_irqrestore(&nvmeq->q_lock, flags); -} - -static __le64 **iod_list(struct nvme_iod *iod) -{ - return ((void *)iod) + iod->offset; -} - -static inline void iod_init(struct nvme_iod *iod, unsigned nbytes, - unsigned nseg, unsigned long private) -{ - iod->private = private; - iod->offset = offsetof(struct nvme_iod, sg[nseg]); - iod->npages = -1; - iod->length = nbytes; - iod->nents = 0; -} - -static struct nvme_iod * -__nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev, - unsigned long priv, gfp_t gfp) -{ - struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) + - sizeof(__le64 *) * nvme_npages(bytes, dev) + - sizeof(struct scatterlist) * nseg, gfp); - - if (iod) - iod_init(iod, bytes, nseg, priv); - - return iod; -} - -static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev, - gfp_t gfp) -{ - unsigned size = !(rq->cmd_flags & REQ_DISCARD) ? blk_rq_bytes(rq) : - sizeof(struct nvme_dsm_range); - struct nvme_iod *iod; - - if (rq->nr_phys_segments <= NVME_INT_PAGES && - size <= NVME_INT_BYTES(dev)) { - struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(rq); - - iod = cmd->iod; - iod_init(iod, size, rq->nr_phys_segments, - (unsigned long) rq | NVME_INT_MASK); - return iod; - } - - return __nvme_alloc_iod(rq->nr_phys_segments, size, dev, - (unsigned long) rq, gfp); -} - -static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod) -{ - const int last_prp = dev->page_size / 8 - 1; - int i; - __le64 **list = iod_list(iod); - dma_addr_t prp_dma = iod->first_dma; - - if (iod->npages == 0) - dma_pool_free(dev->prp_small_pool, list[0], prp_dma); - for (i = 0; i < iod->npages; i++) { - __le64 *prp_list = list[i]; - dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); - dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); - prp_dma = next_prp_dma; - } - - if (iod_should_kfree(iod)) - kfree(iod); -} - -static int nvme_error_status(u16 status) -{ - switch (status & 0x7ff) { - case NVME_SC_SUCCESS: - return 0; - case NVME_SC_CAP_EXCEEDED: - return -ENOSPC; - default: - return -EIO; - } -} - -#ifdef CONFIG_BLK_DEV_INTEGRITY -static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) -{ - if (be32_to_cpu(pi->ref_tag) == v) - pi->ref_tag = cpu_to_be32(p); -} - -static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) -{ - if (be32_to_cpu(pi->ref_tag) == p) - pi->ref_tag = cpu_to_be32(v); -} - -/** - * nvme_dif_remap - remaps ref tags to bip seed and physical lba - * - * The virtual start sector is the one that was originally submitted by the - * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical - * start sector may be different. Remap protection information to match the - * physical LBA on writes, and back to the original seed on reads. - * - * Type 0 and 3 do not have a ref tag, so no remapping required. - */ -static void nvme_dif_remap(struct request *req, - void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) -{ - struct nvme_ns *ns = req->rq_disk->private_data; - struct bio_integrity_payload *bip; - struct t10_pi_tuple *pi; - void *p, *pmap; - u32 i, nlb, ts, phys, virt; - - if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3) - return; - - bip = bio_integrity(req->bio); - if (!bip) - return; - - pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset; - - p = pmap; - virt = bip_get_seed(bip); - phys = nvme_block_nr(ns, blk_rq_pos(req)); - nlb = (blk_rq_bytes(req) >> ns->lba_shift); - ts = ns->disk->integrity->tuple_size; - - for (i = 0; i < nlb; i++, virt++, phys++) { - pi = (struct t10_pi_tuple *)p; - dif_swap(phys, virt, pi); - p += ts; - } - kunmap_atomic(pmap); -} - -static int nvme_noop_verify(struct blk_integrity_iter *iter) -{ - return 0; -} - -static int nvme_noop_generate(struct blk_integrity_iter *iter) -{ - return 0; -} - -struct blk_integrity nvme_meta_noop = { - .name = "NVME_META_NOOP", - .generate_fn = nvme_noop_generate, - .verify_fn = nvme_noop_verify, -}; - -static void nvme_init_integrity(struct nvme_ns *ns) -{ - struct blk_integrity integrity; - - switch (ns->pi_type) { - case NVME_NS_DPS_PI_TYPE3: - integrity = t10_pi_type3_crc; - break; - case NVME_NS_DPS_PI_TYPE1: - case NVME_NS_DPS_PI_TYPE2: - integrity = t10_pi_type1_crc; - break; - default: - integrity = nvme_meta_noop; - break; - } - integrity.tuple_size = ns->ms; - blk_integrity_register(ns->disk, &integrity); - blk_queue_max_integrity_segments(ns->queue, 1); -} -#else /* CONFIG_BLK_DEV_INTEGRITY */ -static void nvme_dif_remap(struct request *req, - void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi)) -{ -} -static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) -{ -} -static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) -{ -} -static void nvme_init_integrity(struct nvme_ns *ns) -{ -} -#endif - -static void req_completion(struct nvme_queue *nvmeq, void *ctx, - struct nvme_completion *cqe) -{ - struct nvme_iod *iod = ctx; - struct request *req = iod_get_private(iod); - struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); - - u16 status = le16_to_cpup(&cqe->status) >> 1; - - if (unlikely(status)) { - if (!(status & NVME_SC_DNR || blk_noretry_request(req)) - && (jiffies - req->start_time) < req->timeout) { - unsigned long flags; - - blk_mq_requeue_request(req); - spin_lock_irqsave(req->q->queue_lock, flags); - if (!blk_queue_stopped(req->q)) - blk_mq_kick_requeue_list(req->q); - spin_unlock_irqrestore(req->q->queue_lock, flags); - return; - } - - if (req->cmd_type == REQ_TYPE_DRV_PRIV) { - if (cmd_rq->ctx == CMD_CTX_CANCELLED) - status = -EINTR; - } else { - status = nvme_error_status(status); - } - } - - if (req->cmd_type == REQ_TYPE_DRV_PRIV) { - u32 result = le32_to_cpup(&cqe->result); - req->special = (void *)(uintptr_t)result; - } - - if (cmd_rq->aborted) - dev_warn(nvmeq->dev->dev, - "completing aborted command with status:%04x\n", - status); - - if (iod->nents) { - dma_unmap_sg(nvmeq->dev->dev, iod->sg, iod->nents, - rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); - if (blk_integrity_rq(req)) { - if (!rq_data_dir(req)) - nvme_dif_remap(req, nvme_dif_complete); - dma_unmap_sg(nvmeq->dev->dev, iod->meta_sg, 1, - rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE); - } - } - nvme_free_iod(nvmeq->dev, iod); - - blk_mq_complete_request(req, status); -} - -/* length is in bytes. gfp flags indicates whether we may sleep. */ -static int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod, - int total_len, gfp_t gfp) -{ - struct dma_pool *pool; - int length = total_len; - struct scatterlist *sg = iod->sg; - int dma_len = sg_dma_len(sg); - u64 dma_addr = sg_dma_address(sg); - u32 page_size = dev->page_size; - int offset = dma_addr & (page_size - 1); - __le64 *prp_list; - __le64 **list = iod_list(iod); - dma_addr_t prp_dma; - int nprps, i; - - length -= (page_size - offset); - if (length <= 0) - return total_len; - - dma_len -= (page_size - offset); - if (dma_len) { - dma_addr += (page_size - offset); - } else { - sg = sg_next(sg); - dma_addr = sg_dma_address(sg); - dma_len = sg_dma_len(sg); - } - - if (length <= page_size) { - iod->first_dma = dma_addr; - return total_len; - } - - nprps = DIV_ROUND_UP(length, page_size); - if (nprps <= (256 / 8)) { - pool = dev->prp_small_pool; - iod->npages = 0; - } else { - pool = dev->prp_page_pool; - iod->npages = 1; - } - - prp_list = dma_pool_alloc(pool, gfp, &prp_dma); - if (!prp_list) { - iod->first_dma = dma_addr; - iod->npages = -1; - return (total_len - length) + page_size; - } - list[0] = prp_list; - iod->first_dma = prp_dma; - i = 0; - for (;;) { - if (i == page_size >> 3) { - __le64 *old_prp_list = prp_list; - prp_list = dma_pool_alloc(pool, gfp, &prp_dma); - if (!prp_list) - return total_len - length; - list[iod->npages++] = prp_list; - prp_list[0] = old_prp_list[i - 1]; - old_prp_list[i - 1] = cpu_to_le64(prp_dma); - i = 1; - } - prp_list[i++] = cpu_to_le64(dma_addr); - dma_len -= page_size; - dma_addr += page_size; - length -= page_size; - if (length <= 0) - break; - if (dma_len > 0) - continue; - BUG_ON(dma_len < 0); - sg = sg_next(sg); - dma_addr = sg_dma_address(sg); - dma_len = sg_dma_len(sg); - } - - return total_len; -} - -static void nvme_submit_priv(struct nvme_queue *nvmeq, struct request *req, - struct nvme_iod *iod) -{ - struct nvme_command cmnd; - - memcpy(&cmnd, req->cmd, sizeof(cmnd)); - cmnd.rw.command_id = req->tag; - if (req->nr_phys_segments) { - cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); - cmnd.rw.prp2 = cpu_to_le64(iod->first_dma); - } - - __nvme_submit_cmd(nvmeq, &cmnd); -} - -/* - * We reuse the small pool to allocate the 16-byte range here as it is not - * worth having a special pool for these or additional cases to handle freeing - * the iod. - */ -static void nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, - struct request *req, struct nvme_iod *iod) -{ - struct nvme_dsm_range *range = - (struct nvme_dsm_range *)iod_list(iod)[0]; - struct nvme_command cmnd; - - range->cattr = cpu_to_le32(0); - range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift); - range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); - - memset(&cmnd, 0, sizeof(cmnd)); - cmnd.dsm.opcode = nvme_cmd_dsm; - cmnd.dsm.command_id = req->tag; - cmnd.dsm.nsid = cpu_to_le32(ns->ns_id); - cmnd.dsm.prp1 = cpu_to_le64(iod->first_dma); - cmnd.dsm.nr = 0; - cmnd.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); - - __nvme_submit_cmd(nvmeq, &cmnd); -} - -static void nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns, - int cmdid) -{ - struct nvme_command cmnd; - - memset(&cmnd, 0, sizeof(cmnd)); - cmnd.common.opcode = nvme_cmd_flush; - cmnd.common.command_id = cmdid; - cmnd.common.nsid = cpu_to_le32(ns->ns_id); - - __nvme_submit_cmd(nvmeq, &cmnd); -} - -static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod, - struct nvme_ns *ns) -{ - struct request *req = iod_get_private(iod); - struct nvme_command cmnd; - u16 control = 0; - u32 dsmgmt = 0; - - if (req->cmd_flags & REQ_FUA) - control |= NVME_RW_FUA; - if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD)) - control |= NVME_RW_LR; - - if (req->cmd_flags & REQ_RAHEAD) - dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; - - memset(&cmnd, 0, sizeof(cmnd)); - cmnd.rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); - cmnd.rw.command_id = req->tag; - cmnd.rw.nsid = cpu_to_le32(ns->ns_id); - cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); - cmnd.rw.prp2 = cpu_to_le64(iod->first_dma); - cmnd.rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); - cmnd.rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); - - if (ns->ms) { - switch (ns->pi_type) { - case NVME_NS_DPS_PI_TYPE3: - control |= NVME_RW_PRINFO_PRCHK_GUARD; - break; - case NVME_NS_DPS_PI_TYPE1: - case NVME_NS_DPS_PI_TYPE2: - control |= NVME_RW_PRINFO_PRCHK_GUARD | - NVME_RW_PRINFO_PRCHK_REF; - cmnd.rw.reftag = cpu_to_le32( - nvme_block_nr(ns, blk_rq_pos(req))); - break; - } - if (blk_integrity_rq(req)) - cmnd.rw.metadata = - cpu_to_le64(sg_dma_address(iod->meta_sg)); - else - control |= NVME_RW_PRINFO_PRACT; - } - - cmnd.rw.control = cpu_to_le16(control); - cmnd.rw.dsmgmt = cpu_to_le32(dsmgmt); - - __nvme_submit_cmd(nvmeq, &cmnd); - - return 0; -} - -/* - * NOTE: ns is NULL when called on the admin queue. - */ -static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, - const struct blk_mq_queue_data *bd) -{ - struct nvme_ns *ns = hctx->queue->queuedata; - struct nvme_queue *nvmeq = hctx->driver_data; - struct nvme_dev *dev = nvmeq->dev; - struct request *req = bd->rq; - struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); - struct nvme_iod *iod; - enum dma_data_direction dma_dir; - - /* - * If formated with metadata, require the block layer provide a buffer - * unless this namespace is formated such that the metadata can be - * stripped/generated by the controller with PRACT=1. - */ - if (ns && ns->ms && !blk_integrity_rq(req)) { - if (!(ns->pi_type && ns->ms == 8) && - req->cmd_type != REQ_TYPE_DRV_PRIV) { - blk_mq_complete_request(req, -EFAULT); - return BLK_MQ_RQ_QUEUE_OK; - } - } - - iod = nvme_alloc_iod(req, dev, GFP_ATOMIC); - if (!iod) - return BLK_MQ_RQ_QUEUE_BUSY; - - if (req->cmd_flags & REQ_DISCARD) { - void *range; - /* - * We reuse the small pool to allocate the 16-byte range here - * as it is not worth having a special pool for these or - * additional cases to handle freeing the iod. - */ - range = dma_pool_alloc(dev->prp_small_pool, GFP_ATOMIC, - &iod->first_dma); - if (!range) - goto retry_cmd; - iod_list(iod)[0] = (__le64 *)range; - iod->npages = 0; - } else if (req->nr_phys_segments) { - dma_dir = rq_data_dir(req) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; - - sg_init_table(iod->sg, req->nr_phys_segments); - iod->nents = blk_rq_map_sg(req->q, req, iod->sg); - if (!iod->nents) - goto error_cmd; - - if (!dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents, dma_dir)) - goto retry_cmd; - - if (blk_rq_bytes(req) != - nvme_setup_prps(dev, iod, blk_rq_bytes(req), GFP_ATOMIC)) { - dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir); - goto retry_cmd; - } - if (blk_integrity_rq(req)) { - if (blk_rq_count_integrity_sg(req->q, req->bio) != 1) - goto error_cmd; - - sg_init_table(iod->meta_sg, 1); - if (blk_rq_map_integrity_sg( - req->q, req->bio, iod->meta_sg) != 1) - goto error_cmd; - - if (rq_data_dir(req)) - nvme_dif_remap(req, nvme_dif_prep); - - if (!dma_map_sg(nvmeq->q_dmadev, iod->meta_sg, 1, dma_dir)) - goto error_cmd; - } - } - - nvme_set_info(cmd, iod, req_completion); - spin_lock_irq(&nvmeq->q_lock); - if (req->cmd_type == REQ_TYPE_DRV_PRIV) - nvme_submit_priv(nvmeq, req, iod); - else if (req->cmd_flags & REQ_DISCARD) - nvme_submit_discard(nvmeq, ns, req, iod); - else if (req->cmd_flags & REQ_FLUSH) - nvme_submit_flush(nvmeq, ns, req->tag); - else - nvme_submit_iod(nvmeq, iod, ns); - - nvme_process_cq(nvmeq); - spin_unlock_irq(&nvmeq->q_lock); - return BLK_MQ_RQ_QUEUE_OK; - - error_cmd: - nvme_free_iod(dev, iod); - return BLK_MQ_RQ_QUEUE_ERROR; - retry_cmd: - nvme_free_iod(dev, iod); - return BLK_MQ_RQ_QUEUE_BUSY; -} - -static int nvme_process_cq(struct nvme_queue *nvmeq) -{ - u16 head, phase; - - head = nvmeq->cq_head; - phase = nvmeq->cq_phase; - - for (;;) { - void *ctx; - nvme_completion_fn fn; - struct nvme_completion cqe = nvmeq->cqes[head]; - if ((le16_to_cpu(cqe.status) & 1) != phase) - break; - nvmeq->sq_head = le16_to_cpu(cqe.sq_head); - if (++head == nvmeq->q_depth) { - head = 0; - phase = !phase; - } - ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn); - fn(nvmeq, ctx, &cqe); - } - - /* If the controller ignores the cq head doorbell and continuously - * writes to the queue, it is theoretically possible to wrap around - * the queue twice and mistakenly return IRQ_NONE. Linux only - * requires that 0.1% of your interrupts are handled, so this isn't - * a big problem. - */ - if (head == nvmeq->cq_head && phase == nvmeq->cq_phase) - return 0; - - writel(head, nvmeq->q_db + nvmeq->dev->db_stride); - nvmeq->cq_head = head; - nvmeq->cq_phase = phase; - - nvmeq->cqe_seen = 1; - return 1; -} - -static irqreturn_t nvme_irq(int irq, void *data) -{ - irqreturn_t result; - struct nvme_queue *nvmeq = data; - spin_lock(&nvmeq->q_lock); - nvme_process_cq(nvmeq); - result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE; - nvmeq->cqe_seen = 0; - spin_unlock(&nvmeq->q_lock); - return result; -} - -static irqreturn_t nvme_irq_check(int irq, void *data) -{ - struct nvme_queue *nvmeq = data; - struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head]; - if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase) - return IRQ_NONE; - return IRQ_WAKE_THREAD; -} - -/* - * Returns 0 on success. If the result is negative, it's a Linux error code; - * if the result is positive, it's an NVM Express status code - */ -int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, - void *buffer, void __user *ubuffer, unsigned bufflen, - u32 *result, unsigned timeout) -{ - bool write = cmd->common.opcode & 1; - struct bio *bio = NULL; - struct request *req; - int ret; - - req = blk_mq_alloc_request(q, write, GFP_KERNEL, false); - if (IS_ERR(req)) - return PTR_ERR(req); - - req->cmd_type = REQ_TYPE_DRV_PRIV; - req->cmd_flags |= REQ_FAILFAST_DRIVER; - req->__data_len = 0; - req->__sector = (sector_t) -1; - req->bio = req->biotail = NULL; - - req->timeout = timeout ? timeout : ADMIN_TIMEOUT; - - req->cmd = (unsigned char *)cmd; - req->cmd_len = sizeof(struct nvme_command); - req->special = (void *)0; - - if (buffer && bufflen) { - ret = blk_rq_map_kern(q, req, buffer, bufflen, __GFP_WAIT); - if (ret) - goto out; - } else if (ubuffer && bufflen) { - ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, __GFP_WAIT); - if (ret) - goto out; - bio = req->bio; - } - - blk_execute_rq(req->q, NULL, req, 0); - if (bio) - blk_rq_unmap_user(bio); - if (result) - *result = (u32)(uintptr_t)req->special; - ret = req->errors; - out: - blk_mq_free_request(req); - return ret; -} - -int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, - void *buffer, unsigned bufflen) -{ - return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen, NULL, 0); -} - -static int nvme_submit_async_admin_req(struct nvme_dev *dev) -{ - struct nvme_queue *nvmeq = dev->queues[0]; - struct nvme_command c; - struct nvme_cmd_info *cmd_info; - struct request *req; - - req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC, true); - if (IS_ERR(req)) - return PTR_ERR(req); - - req->cmd_flags |= REQ_NO_TIMEOUT; - cmd_info = blk_mq_rq_to_pdu(req); - nvme_set_info(cmd_info, NULL, async_req_completion); - - memset(&c, 0, sizeof(c)); - c.common.opcode = nvme_admin_async_event; - c.common.command_id = req->tag; - - blk_mq_free_request(req); - __nvme_submit_cmd(nvmeq, &c); - return 0; -} - -static int nvme_submit_admin_async_cmd(struct nvme_dev *dev, - struct nvme_command *cmd, - struct async_cmd_info *cmdinfo, unsigned timeout) -{ - struct nvme_queue *nvmeq = dev->queues[0]; - struct request *req; - struct nvme_cmd_info *cmd_rq; - - req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_KERNEL, false); - if (IS_ERR(req)) - return PTR_ERR(req); - - req->timeout = timeout; - cmd_rq = blk_mq_rq_to_pdu(req); - cmdinfo->req = req; - nvme_set_info(cmd_rq, cmdinfo, async_completion); - cmdinfo->status = -EINTR; - - cmd->common.command_id = req->tag; - - nvme_submit_cmd(nvmeq, cmd); - return 0; -} - -static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) -{ - struct nvme_command c; - - memset(&c, 0, sizeof(c)); - c.delete_queue.opcode = opcode; - c.delete_queue.qid = cpu_to_le16(id); - - return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0); -} - -static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, - struct nvme_queue *nvmeq) -{ - struct nvme_command c; - int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; - - /* - * Note: we (ab)use the fact the the prp fields survive if no data - * is attached to the request. - */ - memset(&c, 0, sizeof(c)); - c.create_cq.opcode = nvme_admin_create_cq; - c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr); - c.create_cq.cqid = cpu_to_le16(qid); - c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1); - c.create_cq.cq_flags = cpu_to_le16(flags); - c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector); - - return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0); -} - -static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, - struct nvme_queue *nvmeq) -{ - struct nvme_command c; - int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM; - - /* - * Note: we (ab)use the fact the the prp fields survive if no data - * is attached to the request. - */ - memset(&c, 0, sizeof(c)); - c.create_sq.opcode = nvme_admin_create_sq; - c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr); - c.create_sq.sqid = cpu_to_le16(qid); - c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1); - c.create_sq.sq_flags = cpu_to_le16(flags); - c.create_sq.cqid = cpu_to_le16(qid); - - return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0); -} - -static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) -{ - return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid); -} - -static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) -{ - return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid); -} - -int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id) -{ - struct nvme_command c = { }; - int error; - - /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ - c.identify.opcode = nvme_admin_identify; - c.identify.cns = cpu_to_le32(1); - - *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); - if (!*id) - return -ENOMEM; - - error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, - sizeof(struct nvme_id_ctrl)); - if (error) - kfree(*id); - return error; -} - -int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid, - struct nvme_id_ns **id) -{ - struct nvme_command c = { }; - int error; - - /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ - c.identify.opcode = nvme_admin_identify, - c.identify.nsid = cpu_to_le32(nsid), - - *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); - if (!*id) - return -ENOMEM; - - error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, - sizeof(struct nvme_id_ns)); - if (error) - kfree(*id); - return error; -} - -int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid, - dma_addr_t dma_addr, u32 *result) -{ - struct nvme_command c; - - memset(&c, 0, sizeof(c)); - c.features.opcode = nvme_admin_get_features; - c.features.nsid = cpu_to_le32(nsid); - c.features.prp1 = cpu_to_le64(dma_addr); - c.features.fid = cpu_to_le32(fid); - - return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0, - result, 0); -} - -int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11, - dma_addr_t dma_addr, u32 *result) -{ - struct nvme_command c; - - memset(&c, 0, sizeof(c)); - c.features.opcode = nvme_admin_set_features; - c.features.prp1 = cpu_to_le64(dma_addr); - c.features.fid = cpu_to_le32(fid); - c.features.dword11 = cpu_to_le32(dword11); - - return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0, - result, 0); -} - -int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log) -{ - struct nvme_command c = { }; - int error; - - c.common.opcode = nvme_admin_get_log_page, - c.common.nsid = cpu_to_le32(0xFFFFFFFF), - c.common.cdw10[0] = cpu_to_le32( - (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | - NVME_LOG_SMART), - - *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); - if (!*log) - return -ENOMEM; - - error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, - sizeof(struct nvme_smart_log)); - if (error) - kfree(*log); - return error; -} - -/** - * nvme_abort_req - Attempt aborting a request - * - * Schedule controller reset if the command was already aborted once before and - * still hasn't been returned to the driver, or if this is the admin queue. - */ -static void nvme_abort_req(struct request *req) -{ - struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req); - struct nvme_queue *nvmeq = cmd_rq->nvmeq; - struct nvme_dev *dev = nvmeq->dev; - struct request *abort_req; - struct nvme_cmd_info *abort_cmd; - struct nvme_command cmd; - - if (!nvmeq->qid || cmd_rq->aborted) { - unsigned long flags; - - spin_lock_irqsave(&dev_list_lock, flags); - if (work_busy(&dev->reset_work)) - goto out; - list_del_init(&dev->node); - dev_warn(dev->dev, "I/O %d QID %d timeout, reset controller\n", - req->tag, nvmeq->qid); - dev->reset_workfn = nvme_reset_failed_dev; - queue_work(nvme_workq, &dev->reset_work); - out: - spin_unlock_irqrestore(&dev_list_lock, flags); - return; - } - - if (!dev->abort_limit) - return; - - abort_req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC, - false); - if (IS_ERR(abort_req)) - return; - - abort_cmd = blk_mq_rq_to_pdu(abort_req); - nvme_set_info(abort_cmd, abort_req, abort_completion); - - memset(&cmd, 0, sizeof(cmd)); - cmd.abort.opcode = nvme_admin_abort_cmd; - cmd.abort.cid = req->tag; - cmd.abort.sqid = cpu_to_le16(nvmeq->qid); - cmd.abort.command_id = abort_req->tag; - - --dev->abort_limit; - cmd_rq->aborted = 1; - - dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", req->tag, - nvmeq->qid); - nvme_submit_cmd(dev->queues[0], &cmd); -} - -static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved) -{ - struct nvme_queue *nvmeq = data; - void *ctx; - nvme_completion_fn fn; - struct nvme_cmd_info *cmd; - struct nvme_completion cqe; - - if (!blk_mq_request_started(req)) - return; - - cmd = blk_mq_rq_to_pdu(req); - - if (cmd->ctx == CMD_CTX_CANCELLED) - return; - - if (blk_queue_dying(req->q)) - cqe.status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1); - else - cqe.status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); - - - dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n", - req->tag, nvmeq->qid); - ctx = cancel_cmd_info(cmd, &fn); - fn(nvmeq, ctx, &cqe); -} - -static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved) -{ - struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req); - struct nvme_queue *nvmeq = cmd->nvmeq; - - dev_warn(nvmeq->q_dmadev, "Timeout I/O %d QID %d\n", req->tag, - nvmeq->qid); - spin_lock_irq(&nvmeq->q_lock); - nvme_abort_req(req); - spin_unlock_irq(&nvmeq->q_lock); - - /* - * The aborted req will be completed on receiving the abort req. - * We enable the timer again. If hit twice, it'll cause a device reset, - * as the device then is in a faulty state. - */ - return BLK_EH_RESET_TIMER; -} - -static void nvme_free_queue(struct nvme_queue *nvmeq) -{ - dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), - (void *)nvmeq->cqes, nvmeq->cq_dma_addr); - if (nvmeq->sq_cmds) - dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), - nvmeq->sq_cmds, nvmeq->sq_dma_addr); - kfree(nvmeq); -} - -static void nvme_free_queues(struct nvme_dev *dev, int lowest) -{ - int i; - - for (i = dev->queue_count - 1; i >= lowest; i--) { - struct nvme_queue *nvmeq = dev->queues[i]; - dev->queue_count--; - dev->queues[i] = NULL; - nvme_free_queue(nvmeq); - } -} - -/** - * nvme_suspend_queue - put queue into suspended state - * @nvmeq - queue to suspend - */ -static int nvme_suspend_queue(struct nvme_queue *nvmeq) -{ - int vector; - - spin_lock_irq(&nvmeq->q_lock); - if (nvmeq->cq_vector == -1) { - spin_unlock_irq(&nvmeq->q_lock); - return 1; - } - vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; - nvmeq->dev->online_queues--; - nvmeq->cq_vector = -1; - spin_unlock_irq(&nvmeq->q_lock); - - if (!nvmeq->qid && nvmeq->dev->admin_q) - blk_mq_freeze_queue_start(nvmeq->dev->admin_q); - - irq_set_affinity_hint(vector, NULL); - free_irq(vector, nvmeq); - - return 0; -} - -static void nvme_clear_queue(struct nvme_queue *nvmeq) -{ - spin_lock_irq(&nvmeq->q_lock); - if (nvmeq->tags && *nvmeq->tags) - blk_mq_all_tag_busy_iter(*nvmeq->tags, nvme_cancel_queue_ios, nvmeq); - spin_unlock_irq(&nvmeq->q_lock); -} - -static void nvme_disable_queue(struct nvme_dev *dev, int qid) -{ - struct nvme_queue *nvmeq = dev->queues[qid]; - - if (!nvmeq) - return; - if (nvme_suspend_queue(nvmeq)) - return; - - /* Don't tell the adapter to delete the admin queue. - * Don't tell a removed adapter to delete IO queues. */ - if (qid && readl(&dev->bar->csts) != -1) { - adapter_delete_sq(dev, qid); - adapter_delete_cq(dev, qid); - } - - spin_lock_irq(&nvmeq->q_lock); - nvme_process_cq(nvmeq); - spin_unlock_irq(&nvmeq->q_lock); -} - -static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, - int entry_size) -{ - int q_depth = dev->q_depth; - unsigned q_size_aligned = roundup(q_depth * entry_size, dev->page_size); - - if (q_size_aligned * nr_io_queues > dev->cmb_size) { - u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); - mem_per_q = round_down(mem_per_q, dev->page_size); - q_depth = div_u64(mem_per_q, entry_size); - - /* - * Ensure the reduced q_depth is above some threshold where it - * would be better to map queues in system memory with the - * original depth - */ - if (q_depth < 64) - return -ENOMEM; - } - - return q_depth; -} - -static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, - int qid, int depth) -{ - if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { - unsigned offset = (qid - 1) * - roundup(SQ_SIZE(depth), dev->page_size); - nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; - nvmeq->sq_cmds_io = dev->cmb + offset; - } else { - nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), - &nvmeq->sq_dma_addr, GFP_KERNEL); - if (!nvmeq->sq_cmds) - return -ENOMEM; - } - - return 0; -} - -static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, - int depth) -{ - struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL); - if (!nvmeq) - return NULL; - - nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth), - &nvmeq->cq_dma_addr, GFP_KERNEL); - if (!nvmeq->cqes) - goto free_nvmeq; - - if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) - goto free_cqdma; - - nvmeq->q_dmadev = dev->dev; - nvmeq->dev = dev; - snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d", - dev->instance, qid); - spin_lock_init(&nvmeq->q_lock); - nvmeq->cq_head = 0; - nvmeq->cq_phase = 1; - nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; - nvmeq->q_depth = depth; - nvmeq->qid = qid; - nvmeq->cq_vector = -1; - dev->queues[qid] = nvmeq; - - /* make sure queue descriptor is set before queue count, for kthread */ - mb(); - dev->queue_count++; - - return nvmeq; - - free_cqdma: - dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes, - nvmeq->cq_dma_addr); - free_nvmeq: - kfree(nvmeq); - return NULL; -} - -static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, - const char *name) -{ - if (use_threaded_interrupts) - return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, - nvme_irq_check, nvme_irq, IRQF_SHARED, - name, nvmeq); - return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, - IRQF_SHARED, name, nvmeq); -} - -static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) -{ - struct nvme_dev *dev = nvmeq->dev; - - spin_lock_irq(&nvmeq->q_lock); - nvmeq->sq_tail = 0; - nvmeq->cq_head = 0; - nvmeq->cq_phase = 1; - nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride]; - memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth)); - dev->online_queues++; - spin_unlock_irq(&nvmeq->q_lock); -} - -static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) -{ - struct nvme_dev *dev = nvmeq->dev; - int result; - - nvmeq->cq_vector = qid - 1; - result = adapter_alloc_cq(dev, qid, nvmeq); - if (result < 0) - return result; - - result = adapter_alloc_sq(dev, qid, nvmeq); - if (result < 0) - goto release_cq; - - result = queue_request_irq(dev, nvmeq, nvmeq->irqname); - if (result < 0) - goto release_sq; - - nvme_init_queue(nvmeq, qid); - return result; - - release_sq: - adapter_delete_sq(dev, qid); - release_cq: - adapter_delete_cq(dev, qid); - return result; -} - -static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled) -{ - unsigned long timeout; - u32 bit = enabled ? NVME_CSTS_RDY : 0; - - timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies; - - while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) { - msleep(100); - if (fatal_signal_pending(current)) - return -EINTR; - if (time_after(jiffies, timeout)) { - dev_err(dev->dev, - "Device not ready; aborting %s\n", enabled ? - "initialisation" : "reset"); - return -ENODEV; - } - } - - return 0; -} - -/* - * If the device has been passed off to us in an enabled state, just clear - * the enabled bit. The spec says we should set the 'shutdown notification - * bits', but doing so may cause the device to complete commands to the - * admin queue ... and we don't know what memory that might be pointing at! - */ -static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap) -{ - dev->ctrl_config &= ~NVME_CC_SHN_MASK; - dev->ctrl_config &= ~NVME_CC_ENABLE; - writel(dev->ctrl_config, &dev->bar->cc); - - return nvme_wait_ready(dev, cap, false); -} - -static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap) -{ - dev->ctrl_config &= ~NVME_CC_SHN_MASK; - dev->ctrl_config |= NVME_CC_ENABLE; - writel(dev->ctrl_config, &dev->bar->cc); - - return nvme_wait_ready(dev, cap, true); -} - -static int nvme_shutdown_ctrl(struct nvme_dev *dev) -{ - unsigned long timeout; - - dev->ctrl_config &= ~NVME_CC_SHN_MASK; - dev->ctrl_config |= NVME_CC_SHN_NORMAL; - - writel(dev->ctrl_config, &dev->bar->cc); - - timeout = SHUTDOWN_TIMEOUT + jiffies; - while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) != - NVME_CSTS_SHST_CMPLT) { - msleep(100); - if (fatal_signal_pending(current)) - return -EINTR; - if (time_after(jiffies, timeout)) { - dev_err(dev->dev, - "Device shutdown incomplete; abort shutdown\n"); - return -ENODEV; - } - } - - return 0; -} - -static struct blk_mq_ops nvme_mq_admin_ops = { - .queue_rq = nvme_queue_rq, - .map_queue = blk_mq_map_queue, - .init_hctx = nvme_admin_init_hctx, - .exit_hctx = nvme_admin_exit_hctx, - .init_request = nvme_admin_init_request, - .timeout = nvme_timeout, -}; - -static struct blk_mq_ops nvme_mq_ops = { - .queue_rq = nvme_queue_rq, - .map_queue = blk_mq_map_queue, - .init_hctx = nvme_init_hctx, - .init_request = nvme_init_request, - .timeout = nvme_timeout, -}; - -static void nvme_dev_remove_admin(struct nvme_dev *dev) -{ - if (dev->admin_q && !blk_queue_dying(dev->admin_q)) { - blk_cleanup_queue(dev->admin_q); - blk_mq_free_tag_set(&dev->admin_tagset); - } -} - -static int nvme_alloc_admin_tags(struct nvme_dev *dev) -{ - if (!dev->admin_q) { - dev->admin_tagset.ops = &nvme_mq_admin_ops; - dev->admin_tagset.nr_hw_queues = 1; - dev->admin_tagset.queue_depth = NVME_AQ_DEPTH - 1; - dev->admin_tagset.reserved_tags = 1; - dev->admin_tagset.timeout = ADMIN_TIMEOUT; - dev->admin_tagset.numa_node = dev_to_node(dev->dev); - dev->admin_tagset.cmd_size = nvme_cmd_size(dev); - dev->admin_tagset.driver_data = dev; - - if (blk_mq_alloc_tag_set(&dev->admin_tagset)) - return -ENOMEM; - - dev->admin_q = blk_mq_init_queue(&dev->admin_tagset); - if (IS_ERR(dev->admin_q)) { - blk_mq_free_tag_set(&dev->admin_tagset); - return -ENOMEM; - } - if (!blk_get_queue(dev->admin_q)) { - nvme_dev_remove_admin(dev); - dev->admin_q = NULL; - return -ENODEV; - } - } else - blk_mq_unfreeze_queue(dev->admin_q); - - return 0; -} - -static int nvme_configure_admin_queue(struct nvme_dev *dev) -{ - int result; - u32 aqa; - u64 cap = readq(&dev->bar->cap); - struct nvme_queue *nvmeq; - unsigned page_shift = PAGE_SHIFT; - unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12; - unsigned dev_page_max = NVME_CAP_MPSMAX(cap) + 12; - - if (page_shift < dev_page_min) { - dev_err(dev->dev, - "Minimum device page size (%u) too large for " - "host (%u)\n", 1 << dev_page_min, - 1 << page_shift); - return -ENODEV; - } - if (page_shift > dev_page_max) { - dev_info(dev->dev, - "Device maximum page size (%u) smaller than " - "host (%u); enabling work-around\n", - 1 << dev_page_max, 1 << page_shift); - page_shift = dev_page_max; - } - - dev->subsystem = readl(&dev->bar->vs) >= NVME_VS(1, 1) ? - NVME_CAP_NSSRC(cap) : 0; - - if (dev->subsystem && (readl(&dev->bar->csts) & NVME_CSTS_NSSRO)) - writel(NVME_CSTS_NSSRO, &dev->bar->csts); - - result = nvme_disable_ctrl(dev, cap); - if (result < 0) - return result; - - nvmeq = dev->queues[0]; - if (!nvmeq) { - nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH); - if (!nvmeq) - return -ENOMEM; - } - - aqa = nvmeq->q_depth - 1; - aqa |= aqa << 16; - - dev->page_size = 1 << page_shift; - - dev->ctrl_config = NVME_CC_CSS_NVM; - dev->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT; - dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE; - dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES; - - writel(aqa, &dev->bar->aqa); - writeq(nvmeq->sq_dma_addr, &dev->bar->asq); - writeq(nvmeq->cq_dma_addr, &dev->bar->acq); - - result = nvme_enable_ctrl(dev, cap); - if (result) - goto free_nvmeq; - - nvmeq->cq_vector = 0; - result = queue_request_irq(dev, nvmeq, nvmeq->irqname); - if (result) { - nvmeq->cq_vector = -1; - goto free_nvmeq; - } - - return result; - - free_nvmeq: - nvme_free_queues(dev, 0); - return result; -} - -static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) -{ - struct nvme_dev *dev = ns->dev; - struct nvme_user_io io; - struct nvme_command c; - unsigned length, meta_len; - int status, write; - dma_addr_t meta_dma = 0; - void *meta = NULL; - void __user *metadata; - - if (copy_from_user(&io, uio, sizeof(io))) - return -EFAULT; - - switch (io.opcode) { - case nvme_cmd_write: - case nvme_cmd_read: - case nvme_cmd_compare: - break; - default: - return -EINVAL; - } - - length = (io.nblocks + 1) << ns->lba_shift; - meta_len = (io.nblocks + 1) * ns->ms; - metadata = (void __user *)(unsigned long)io.metadata; - write = io.opcode & 1; - - if (ns->ext) { - length += meta_len; - meta_len = 0; - } - if (meta_len) { - if (((io.metadata & 3) || !io.metadata) && !ns->ext) - return -EINVAL; - - meta = dma_alloc_coherent(dev->dev, meta_len, - &meta_dma, GFP_KERNEL); - - if (!meta) { - status = -ENOMEM; - goto unmap; - } - if (write) { - if (copy_from_user(meta, metadata, meta_len)) { - status = -EFAULT; - goto unmap; - } - } - } - - memset(&c, 0, sizeof(c)); - c.rw.opcode = io.opcode; - c.rw.flags = io.flags; - c.rw.nsid = cpu_to_le32(ns->ns_id); - c.rw.slba = cpu_to_le64(io.slba); - c.rw.length = cpu_to_le16(io.nblocks); - c.rw.control = cpu_to_le16(io.control); - c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); - c.rw.reftag = cpu_to_le32(io.reftag); - c.rw.apptag = cpu_to_le16(io.apptag); - c.rw.appmask = cpu_to_le16(io.appmask); - c.rw.metadata = cpu_to_le64(meta_dma); - - status = __nvme_submit_sync_cmd(ns->queue, &c, NULL, - (void __user *)io.addr, length, NULL, 0); - unmap: - if (meta) { - if (status == NVME_SC_SUCCESS && !write) { - if (copy_to_user(metadata, meta, meta_len)) - status = -EFAULT; - } - dma_free_coherent(dev->dev, meta_len, meta, meta_dma); - } - return status; -} - -static int nvme_user_cmd(struct nvme_dev *dev, struct nvme_ns *ns, - struct nvme_passthru_cmd __user *ucmd) -{ - struct nvme_passthru_cmd cmd; - struct nvme_command c; - unsigned timeout = 0; - int status; - - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - if (copy_from_user(&cmd, ucmd, sizeof(cmd))) - return -EFAULT; - - memset(&c, 0, sizeof(c)); - c.common.opcode = cmd.opcode; - c.common.flags = cmd.flags; - c.common.nsid = cpu_to_le32(cmd.nsid); - c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); - c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); - c.common.cdw10[0] = cpu_to_le32(cmd.cdw10); - c.common.cdw10[1] = cpu_to_le32(cmd.cdw11); - c.common.cdw10[2] = cpu_to_le32(cmd.cdw12); - c.common.cdw10[3] = cpu_to_le32(cmd.cdw13); - c.common.cdw10[4] = cpu_to_le32(cmd.cdw14); - c.common.cdw10[5] = cpu_to_le32(cmd.cdw15); - - if (cmd.timeout_ms) - timeout = msecs_to_jiffies(cmd.timeout_ms); - - status = __nvme_submit_sync_cmd(ns ? ns->queue : dev->admin_q, &c, - NULL, (void __user *)cmd.addr, cmd.data_len, - &cmd.result, timeout); - if (status >= 0) { - if (put_user(cmd.result, &ucmd->result)) - return -EFAULT; - } - - return status; -} - -static int nvme_subsys_reset(struct nvme_dev *dev) -{ - if (!dev->subsystem) - return -ENOTTY; - - writel(0x4E564D65, &dev->bar->nssr); /* "NVMe" */ - return 0; -} - -static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, - unsigned long arg) -{ - struct nvme_ns *ns = bdev->bd_disk->private_data; - - switch (cmd) { - case NVME_IOCTL_ID: - force_successful_syscall_return(); - return ns->ns_id; - case NVME_IOCTL_ADMIN_CMD: - return nvme_user_cmd(ns->dev, NULL, (void __user *)arg); - case NVME_IOCTL_IO_CMD: - return nvme_user_cmd(ns->dev, ns, (void __user *)arg); - case NVME_IOCTL_SUBMIT_IO: - return nvme_submit_io(ns, (void __user *)arg); - case SG_GET_VERSION_NUM: - return nvme_sg_get_version_num((void __user *)arg); - case SG_IO: - return nvme_sg_io(ns, (void __user *)arg); - default: - return -ENOTTY; - } -} - -#ifdef CONFIG_COMPAT -static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode, - unsigned int cmd, unsigned long arg) -{ - switch (cmd) { - case SG_IO: - return -ENOIOCTLCMD; - } - return nvme_ioctl(bdev, mode, cmd, arg); -} -#else -#define nvme_compat_ioctl NULL -#endif - -static int nvme_open(struct block_device *bdev, fmode_t mode) -{ - int ret = 0; - struct nvme_ns *ns; - - spin_lock(&dev_list_lock); - ns = bdev->bd_disk->private_data; - if (!ns) - ret = -ENXIO; - else if (!kref_get_unless_zero(&ns->dev->kref)) - ret = -ENXIO; - spin_unlock(&dev_list_lock); - - return ret; -} - -static void nvme_free_dev(struct kref *kref); - -static void nvme_release(struct gendisk *disk, fmode_t mode) -{ - struct nvme_ns *ns = disk->private_data; - struct nvme_dev *dev = ns->dev; - - kref_put(&dev->kref, nvme_free_dev); -} - -static int nvme_getgeo(struct block_device *bd, struct hd_geometry *geo) -{ - /* some standard values */ - geo->heads = 1 << 6; - geo->sectors = 1 << 5; - geo->cylinders = get_capacity(bd->bd_disk) >> 11; - return 0; -} - -static void nvme_config_discard(struct nvme_ns *ns) -{ - u32 logical_block_size = queue_logical_block_size(ns->queue); - ns->queue->limits.discard_zeroes_data = 0; - ns->queue->limits.discard_alignment = logical_block_size; - ns->queue->limits.discard_granularity = logical_block_size; - blk_queue_max_discard_sectors(ns->queue, 0xffffffff); - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); -} - -static int nvme_revalidate_disk(struct gendisk *disk) -{ - struct nvme_ns *ns = disk->private_data; - struct nvme_dev *dev = ns->dev; - struct nvme_id_ns *id; - u8 lbaf, pi_type; - u16 old_ms; - unsigned short bs; - - if (nvme_identify_ns(dev, ns->ns_id, &id)) { - dev_warn(dev->dev, "%s: Identify failure nvme%dn%d\n", __func__, - dev->instance, ns->ns_id); - return -ENODEV; - } - if (id->ncap == 0) { - kfree(id); - return -ENODEV; - } - - old_ms = ns->ms; - lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK; - ns->lba_shift = id->lbaf[lbaf].ds; - ns->ms = le16_to_cpu(id->lbaf[lbaf].ms); - ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); - - /* - * If identify namespace failed, use default 512 byte block size so - * block layer can use before failing read/write for 0 capacity. - */ - if (ns->lba_shift == 0) - ns->lba_shift = 9; - bs = 1 << ns->lba_shift; - - /* XXX: PI implementation requires metadata equal t10 pi tuple size */ - pi_type = ns->ms == sizeof(struct t10_pi_tuple) ? - id->dps & NVME_NS_DPS_PI_MASK : 0; - - if (blk_get_integrity(disk) && (ns->pi_type != pi_type || - ns->ms != old_ms || - bs != queue_logical_block_size(disk->queue) || - (ns->ms && ns->ext))) - blk_integrity_unregister(disk); - - ns->pi_type = pi_type; - blk_queue_logical_block_size(ns->queue, bs); - - if (ns->ms && !blk_get_integrity(disk) && (disk->flags & GENHD_FL_UP) && - !ns->ext) - nvme_init_integrity(ns); - - if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) - set_capacity(disk, 0); - else - set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); - - if (dev->oncs & NVME_CTRL_ONCS_DSM) - nvme_config_discard(ns); - - kfree(id); - return 0; -} - -static const struct block_device_operations nvme_fops = { - .owner = THIS_MODULE, - .ioctl = nvme_ioctl, - .compat_ioctl = nvme_compat_ioctl, - .open = nvme_open, - .release = nvme_release, - .getgeo = nvme_getgeo, - .revalidate_disk= nvme_revalidate_disk, -}; - -static int nvme_kthread(void *data) -{ - struct nvme_dev *dev, *next; - - while (!kthread_should_stop()) { - set_current_state(TASK_INTERRUPTIBLE); - spin_lock(&dev_list_lock); - list_for_each_entry_safe(dev, next, &dev_list, node) { - int i; - u32 csts = readl(&dev->bar->csts); - - if ((dev->subsystem && (csts & NVME_CSTS_NSSRO)) || - csts & NVME_CSTS_CFS) { - if (work_busy(&dev->reset_work)) - continue; - list_del_init(&dev->node); - dev_warn(dev->dev, - "Failed status: %x, reset controller\n", - readl(&dev->bar->csts)); - dev->reset_workfn = nvme_reset_failed_dev; - queue_work(nvme_workq, &dev->reset_work); - continue; - } - for (i = 0; i < dev->queue_count; i++) { - struct nvme_queue *nvmeq = dev->queues[i]; - if (!nvmeq) - continue; - spin_lock_irq(&nvmeq->q_lock); - nvme_process_cq(nvmeq); - - while ((i == 0) && (dev->event_limit > 0)) { - if (nvme_submit_async_admin_req(dev)) - break; - dev->event_limit--; - } - spin_unlock_irq(&nvmeq->q_lock); - } - } - spin_unlock(&dev_list_lock); - schedule_timeout(round_jiffies_relative(HZ)); - } - return 0; -} - -static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid) -{ - struct nvme_ns *ns; - struct gendisk *disk; - int node = dev_to_node(dev->dev); - - ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); - if (!ns) - return; - - ns->queue = blk_mq_init_queue(&dev->tagset); - if (IS_ERR(ns->queue)) - goto out_free_ns; - queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue); - queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); - ns->dev = dev; - ns->queue->queuedata = ns; - - disk = alloc_disk_node(0, node); - if (!disk) - goto out_free_queue; - - ns->ns_id = nsid; - ns->disk = disk; - ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ - list_add_tail(&ns->list, &dev->namespaces); - - blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); - if (dev->max_hw_sectors) { - blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors); - blk_queue_max_segments(ns->queue, - ((dev->max_hw_sectors << 9) / dev->page_size) + 1); - } - if (dev->stripe_size) - blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9); - if (dev->vwc & NVME_CTRL_VWC_PRESENT) - blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA); - blk_queue_virt_boundary(ns->queue, dev->page_size - 1); - - disk->major = nvme_major; - disk->first_minor = 0; - disk->fops = &nvme_fops; - disk->private_data = ns; - disk->queue = ns->queue; - disk->driverfs_dev = dev->device; - disk->flags = GENHD_FL_EXT_DEVT; - sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid); - - /* - * Initialize capacity to 0 until we establish the namespace format and - * setup integrity extentions if necessary. The revalidate_disk after - * add_disk allows the driver to register with integrity if the format - * requires it. - */ - set_capacity(disk, 0); - if (nvme_revalidate_disk(ns->disk)) - goto out_free_disk; - - add_disk(ns->disk); - if (ns->ms) { - struct block_device *bd = bdget_disk(ns->disk, 0); - if (!bd) - return; - if (blkdev_get(bd, FMODE_READ, NULL)) { - bdput(bd); - return; - } - blkdev_reread_part(bd); - blkdev_put(bd, FMODE_READ); - } - return; - out_free_disk: - kfree(disk); - list_del(&ns->list); - out_free_queue: - blk_cleanup_queue(ns->queue); - out_free_ns: - kfree(ns); -} - -static void nvme_create_io_queues(struct nvme_dev *dev) -{ - unsigned i; - - for (i = dev->queue_count; i <= dev->max_qid; i++) - if (!nvme_alloc_queue(dev, i, dev->q_depth)) - break; - - for (i = dev->online_queues; i <= dev->queue_count - 1; i++) - if (nvme_create_queue(dev->queues[i], i)) - break; -} - -static int set_queue_count(struct nvme_dev *dev, int count) -{ - int status; - u32 result; - u32 q_count = (count - 1) | ((count - 1) << 16); - - status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0, - &result); - if (status < 0) - return status; - if (status > 0) { - dev_err(dev->dev, "Could not set queue count (%d)\n", status); - return 0; - } - return min(result & 0xffff, result >> 16) + 1; -} - -static void __iomem *nvme_map_cmb(struct nvme_dev *dev) -{ - u64 szu, size, offset; - u32 cmbloc; - resource_size_t bar_size; - struct pci_dev *pdev = to_pci_dev(dev->dev); - void __iomem *cmb; - dma_addr_t dma_addr; - - if (!use_cmb_sqes) - return NULL; - - dev->cmbsz = readl(&dev->bar->cmbsz); - if (!(NVME_CMB_SZ(dev->cmbsz))) - return NULL; - - cmbloc = readl(&dev->bar->cmbloc); - - szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); - size = szu * NVME_CMB_SZ(dev->cmbsz); - offset = szu * NVME_CMB_OFST(cmbloc); - bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc)); - - if (offset > bar_size) - return NULL; - - /* - * Controllers may support a CMB size larger than their BAR, - * for example, due to being behind a bridge. Reduce the CMB to - * the reported size of the BAR - */ - if (size > bar_size - offset) - size = bar_size - offset; - - dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset; - cmb = ioremap_wc(dma_addr, size); - if (!cmb) - return NULL; - - dev->cmb_dma_addr = dma_addr; - dev->cmb_size = size; - return cmb; -} - -static inline void nvme_release_cmb(struct nvme_dev *dev) -{ - if (dev->cmb) { - iounmap(dev->cmb); - dev->cmb = NULL; - } -} - -static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) -{ - return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); -} - -static int nvme_setup_io_queues(struct nvme_dev *dev) -{ - struct nvme_queue *adminq = dev->queues[0]; - struct pci_dev *pdev = to_pci_dev(dev->dev); - int result, i, vecs, nr_io_queues, size; - - nr_io_queues = num_possible_cpus(); - result = set_queue_count(dev, nr_io_queues); - if (result <= 0) - return result; - if (result < nr_io_queues) - nr_io_queues = result; - - if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { - result = nvme_cmb_qdepth(dev, nr_io_queues, - sizeof(struct nvme_command)); - if (result > 0) - dev->q_depth = result; - else - nvme_release_cmb(dev); - } - - size = db_bar_size(dev, nr_io_queues); - if (size > 8192) { - iounmap(dev->bar); - do { - dev->bar = ioremap(pci_resource_start(pdev, 0), size); - if (dev->bar) - break; - if (!--nr_io_queues) - return -ENOMEM; - size = db_bar_size(dev, nr_io_queues); - } while (1); - dev->dbs = ((void __iomem *)dev->bar) + 4096; - adminq->q_db = dev->dbs; - } - - /* Deregister the admin queue's interrupt */ - free_irq(dev->entry[0].vector, adminq); - - /* - * If we enable msix early due to not intx, disable it again before - * setting up the full range we need. - */ - if (!pdev->irq) - pci_disable_msix(pdev); - - for (i = 0; i < nr_io_queues; i++) - dev->entry[i].entry = i; - vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); - if (vecs < 0) { - vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); - if (vecs < 0) { - vecs = 1; - } else { - for (i = 0; i < vecs; i++) - dev->entry[i].vector = i + pdev->irq; - } - } - - /* - * Should investigate if there's a performance win from allocating - * more queues than interrupt vectors; it might allow the submission - * path to scale better, even if the receive path is limited by the - * number of interrupts. - */ - nr_io_queues = vecs; - dev->max_qid = nr_io_queues; - - result = queue_request_irq(dev, adminq, adminq->irqname); - if (result) { - adminq->cq_vector = -1; - goto free_queues; - } - - /* Free previously allocated queues that are no longer usable */ - nvme_free_queues(dev, nr_io_queues + 1); - nvme_create_io_queues(dev); - - return 0; - - free_queues: - nvme_free_queues(dev, 1); - return result; -} - -static void nvme_free_namespace(struct nvme_ns *ns) -{ - list_del(&ns->list); - - spin_lock(&dev_list_lock); - ns->disk->private_data = NULL; - spin_unlock(&dev_list_lock); - - put_disk(ns->disk); - kfree(ns); -} - -static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) -{ - struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); - struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); - - return nsa->ns_id - nsb->ns_id; -} - -static struct nvme_ns *nvme_find_ns(struct nvme_dev *dev, unsigned nsid) -{ - struct nvme_ns *ns; - - list_for_each_entry(ns, &dev->namespaces, list) { - if (ns->ns_id == nsid) - return ns; - if (ns->ns_id > nsid) - break; - } - return NULL; -} - -static inline bool nvme_io_incapable(struct nvme_dev *dev) -{ - return (!dev->bar || readl(&dev->bar->csts) & NVME_CSTS_CFS || - dev->online_queues < 2); -} - -static void nvme_ns_remove(struct nvme_ns *ns) -{ - bool kill = nvme_io_incapable(ns->dev) && !blk_queue_dying(ns->queue); - - if (kill) - blk_set_queue_dying(ns->queue); - if (ns->disk->flags & GENHD_FL_UP) { - if (blk_get_integrity(ns->disk)) - blk_integrity_unregister(ns->disk); - del_gendisk(ns->disk); - } - if (kill || !blk_queue_dying(ns->queue)) { - blk_mq_abort_requeue_list(ns->queue); - blk_cleanup_queue(ns->queue); - } -} - -static void nvme_scan_namespaces(struct nvme_dev *dev, unsigned nn) -{ - struct nvme_ns *ns, *next; - unsigned i; - - for (i = 1; i <= nn; i++) { - ns = nvme_find_ns(dev, i); - if (ns) { - if (revalidate_disk(ns->disk)) { - nvme_ns_remove(ns); - nvme_free_namespace(ns); - } - } else - nvme_alloc_ns(dev, i); - } - list_for_each_entry_safe(ns, next, &dev->namespaces, list) { - if (ns->ns_id > nn) { - nvme_ns_remove(ns); - nvme_free_namespace(ns); - } - } - list_sort(NULL, &dev->namespaces, ns_cmp); -} - -static void nvme_set_irq_hints(struct nvme_dev *dev) -{ - struct nvme_queue *nvmeq; - int i; - - for (i = 0; i < dev->online_queues; i++) { - nvmeq = dev->queues[i]; - - if (!nvmeq->tags || !(*nvmeq->tags)) - continue; - - irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, - blk_mq_tags_cpumask(*nvmeq->tags)); - } -} - -static void nvme_dev_scan(struct work_struct *work) -{ - struct nvme_dev *dev = container_of(work, struct nvme_dev, scan_work); - struct nvme_id_ctrl *ctrl; - - if (!dev->tagset.tags) - return; - if (nvme_identify_ctrl(dev, &ctrl)) - return; - nvme_scan_namespaces(dev, le32_to_cpup(&ctrl->nn)); - kfree(ctrl); - nvme_set_irq_hints(dev); -} - -/* - * Return: error value if an error occurred setting up the queues or calling - * Identify Device. 0 if these succeeded, even if adding some of the - * namespaces failed. At the moment, these failures are silent. TBD which - * failures should be reported. - */ -static int nvme_dev_add(struct nvme_dev *dev) -{ - struct pci_dev *pdev = to_pci_dev(dev->dev); - int res; - struct nvme_id_ctrl *ctrl; - int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12; - - res = nvme_identify_ctrl(dev, &ctrl); - if (res) { - dev_err(dev->dev, "Identify Controller failed (%d)\n", res); - return -EIO; - } - - dev->oncs = le16_to_cpup(&ctrl->oncs); - dev->abort_limit = ctrl->acl + 1; - dev->vwc = ctrl->vwc; - memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn)); - memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn)); - memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr)); - if (ctrl->mdts) - dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9); - if ((pdev->vendor == PCI_VENDOR_ID_INTEL) && - (pdev->device == 0x0953) && ctrl->vs[3]) { - unsigned int max_hw_sectors; - - dev->stripe_size = 1 << (ctrl->vs[3] + shift); - max_hw_sectors = dev->stripe_size >> (shift - 9); - if (dev->max_hw_sectors) { - dev->max_hw_sectors = min(max_hw_sectors, - dev->max_hw_sectors); - } else - dev->max_hw_sectors = max_hw_sectors; - } - kfree(ctrl); - - if (!dev->tagset.tags) { - dev->tagset.ops = &nvme_mq_ops; - dev->tagset.nr_hw_queues = dev->online_queues - 1; - dev->tagset.timeout = NVME_IO_TIMEOUT; - dev->tagset.numa_node = dev_to_node(dev->dev); - dev->tagset.queue_depth = - min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; - dev->tagset.cmd_size = nvme_cmd_size(dev); - dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; - dev->tagset.driver_data = dev; - - if (blk_mq_alloc_tag_set(&dev->tagset)) - return 0; - } - schedule_work(&dev->scan_work); - return 0; -} - -static int nvme_dev_map(struct nvme_dev *dev) -{ - u64 cap; - int bars, result = -ENOMEM; - struct pci_dev *pdev = to_pci_dev(dev->dev); - - if (pci_enable_device_mem(pdev)) - return result; - - dev->entry[0].vector = pdev->irq; - pci_set_master(pdev); - bars = pci_select_bars(pdev, IORESOURCE_MEM); - if (!bars) - goto disable_pci; - - if (pci_request_selected_regions(pdev, bars, "nvme")) - goto disable_pci; - - if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) && - dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32))) - goto disable; - - dev->bar = ioremap(pci_resource_start(pdev, 0), 8192); - if (!dev->bar) - goto disable; - - if (readl(&dev->bar->csts) == -1) { - result = -ENODEV; - goto unmap; - } - - /* - * Some devices don't advertse INTx interrupts, pre-enable a single - * MSIX vec for setup. We'll adjust this later. - */ - if (!pdev->irq) { - result = pci_enable_msix(pdev, dev->entry, 1); - if (result < 0) - goto unmap; - } - - cap = readq(&dev->bar->cap); - dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); - dev->db_stride = 1 << NVME_CAP_STRIDE(cap); - dev->dbs = ((void __iomem *)dev->bar) + 4096; - if (readl(&dev->bar->vs) >= NVME_VS(1, 2)) - dev->cmb = nvme_map_cmb(dev); - - return 0; - - unmap: - iounmap(dev->bar); - dev->bar = NULL; - disable: - pci_release_regions(pdev); - disable_pci: - pci_disable_device(pdev); - return result; -} - -static void nvme_dev_unmap(struct nvme_dev *dev) -{ - struct pci_dev *pdev = to_pci_dev(dev->dev); - - if (pdev->msi_enabled) - pci_disable_msi(pdev); - else if (pdev->msix_enabled) - pci_disable_msix(pdev); - - if (dev->bar) { - iounmap(dev->bar); - dev->bar = NULL; - pci_release_regions(pdev); - } - - if (pci_is_enabled(pdev)) - pci_disable_device(pdev); -} - -struct nvme_delq_ctx { - struct task_struct *waiter; - struct kthread_worker *worker; - atomic_t refcount; -}; - -static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev) -{ - dq->waiter = current; - mb(); - - for (;;) { - set_current_state(TASK_KILLABLE); - if (!atomic_read(&dq->refcount)) - break; - if (!schedule_timeout(ADMIN_TIMEOUT) || - fatal_signal_pending(current)) { - /* - * Disable the controller first since we can't trust it - * at this point, but leave the admin queue enabled - * until all queue deletion requests are flushed. - * FIXME: This may take a while if there are more h/w - * queues than admin tags. - */ - set_current_state(TASK_RUNNING); - nvme_disable_ctrl(dev, readq(&dev->bar->cap)); - nvme_clear_queue(dev->queues[0]); - flush_kthread_worker(dq->worker); - nvme_disable_queue(dev, 0); - return; - } - } - set_current_state(TASK_RUNNING); -} - -static void nvme_put_dq(struct nvme_delq_ctx *dq) -{ - atomic_dec(&dq->refcount); - if (dq->waiter) - wake_up_process(dq->waiter); -} - -static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq) -{ - atomic_inc(&dq->refcount); - return dq; -} - -static void nvme_del_queue_end(struct nvme_queue *nvmeq) -{ - struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx; - nvme_put_dq(dq); -} - -static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode, - kthread_work_func_t fn) -{ - struct nvme_command c; - - memset(&c, 0, sizeof(c)); - c.delete_queue.opcode = opcode; - c.delete_queue.qid = cpu_to_le16(nvmeq->qid); - - init_kthread_work(&nvmeq->cmdinfo.work, fn); - return nvme_submit_admin_async_cmd(nvmeq->dev, &c, &nvmeq->cmdinfo, - ADMIN_TIMEOUT); -} - -static void nvme_del_cq_work_handler(struct kthread_work *work) -{ - struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, - cmdinfo.work); - nvme_del_queue_end(nvmeq); -} - -static int nvme_delete_cq(struct nvme_queue *nvmeq) -{ - return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq, - nvme_del_cq_work_handler); -} - -static void nvme_del_sq_work_handler(struct kthread_work *work) -{ - struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, - cmdinfo.work); - int status = nvmeq->cmdinfo.status; - - if (!status) - status = nvme_delete_cq(nvmeq); - if (status) - nvme_del_queue_end(nvmeq); -} - -static int nvme_delete_sq(struct nvme_queue *nvmeq) -{ - return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq, - nvme_del_sq_work_handler); -} - -static void nvme_del_queue_start(struct kthread_work *work) -{ - struct nvme_queue *nvmeq = container_of(work, struct nvme_queue, - cmdinfo.work); - if (nvme_delete_sq(nvmeq)) - nvme_del_queue_end(nvmeq); -} - -static void nvme_disable_io_queues(struct nvme_dev *dev) -{ - int i; - DEFINE_KTHREAD_WORKER_ONSTACK(worker); - struct nvme_delq_ctx dq; - struct task_struct *kworker_task = kthread_run(kthread_worker_fn, - &worker, "nvme%d", dev->instance); - - if (IS_ERR(kworker_task)) { - dev_err(dev->dev, - "Failed to create queue del task\n"); - for (i = dev->queue_count - 1; i > 0; i--) - nvme_disable_queue(dev, i); - return; - } - - dq.waiter = NULL; - atomic_set(&dq.refcount, 0); - dq.worker = &worker; - for (i = dev->queue_count - 1; i > 0; i--) { - struct nvme_queue *nvmeq = dev->queues[i]; - - if (nvme_suspend_queue(nvmeq)) - continue; - nvmeq->cmdinfo.ctx = nvme_get_dq(&dq); - nvmeq->cmdinfo.worker = dq.worker; - init_kthread_work(&nvmeq->cmdinfo.work, nvme_del_queue_start); - queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work); - } - nvme_wait_dq(&dq, dev); - kthread_stop(kworker_task); -} - -/* -* Remove the node from the device list and check -* for whether or not we need to stop the nvme_thread. -*/ -static void nvme_dev_list_remove(struct nvme_dev *dev) -{ - struct task_struct *tmp = NULL; - - spin_lock(&dev_list_lock); - list_del_init(&dev->node); - if (list_empty(&dev_list) && !IS_ERR_OR_NULL(nvme_thread)) { - tmp = nvme_thread; - nvme_thread = NULL; - } - spin_unlock(&dev_list_lock); - - if (tmp) - kthread_stop(tmp); -} - -static void nvme_freeze_queues(struct nvme_dev *dev) -{ - struct nvme_ns *ns; - - list_for_each_entry(ns, &dev->namespaces, list) { - blk_mq_freeze_queue_start(ns->queue); - - spin_lock_irq(ns->queue->queue_lock); - queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue); - spin_unlock_irq(ns->queue->queue_lock); - - blk_mq_cancel_requeue_work(ns->queue); - blk_mq_stop_hw_queues(ns->queue); - } -} - -static void nvme_unfreeze_queues(struct nvme_dev *dev) -{ - struct nvme_ns *ns; - - list_for_each_entry(ns, &dev->namespaces, list) { - queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns->queue); - blk_mq_unfreeze_queue(ns->queue); - blk_mq_start_stopped_hw_queues(ns->queue, true); - blk_mq_kick_requeue_list(ns->queue); - } -} - -static void nvme_dev_shutdown(struct nvme_dev *dev) -{ - int i; - u32 csts = -1; - - nvme_dev_list_remove(dev); - - if (dev->bar) { - nvme_freeze_queues(dev); - csts = readl(&dev->bar->csts); - } - if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) { - for (i = dev->queue_count - 1; i >= 0; i--) { - struct nvme_queue *nvmeq = dev->queues[i]; - nvme_suspend_queue(nvmeq); - } - } else { - nvme_disable_io_queues(dev); - nvme_shutdown_ctrl(dev); - nvme_disable_queue(dev, 0); - } - nvme_dev_unmap(dev); - - for (i = dev->queue_count - 1; i >= 0; i--) - nvme_clear_queue(dev->queues[i]); -} - -static void nvme_dev_remove(struct nvme_dev *dev) -{ - struct nvme_ns *ns; - - list_for_each_entry(ns, &dev->namespaces, list) - nvme_ns_remove(ns); -} - -static int nvme_setup_prp_pools(struct nvme_dev *dev) -{ - dev->prp_page_pool = dma_pool_create("prp list page", dev->dev, - PAGE_SIZE, PAGE_SIZE, 0); - if (!dev->prp_page_pool) - return -ENOMEM; - - /* Optimisation for I/Os between 4k and 128k */ - dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev, - 256, 256, 0); - if (!dev->prp_small_pool) { - dma_pool_destroy(dev->prp_page_pool); - return -ENOMEM; - } - return 0; -} - -static void nvme_release_prp_pools(struct nvme_dev *dev) -{ - dma_pool_destroy(dev->prp_page_pool); - dma_pool_destroy(dev->prp_small_pool); -} - -static DEFINE_IDA(nvme_instance_ida); - -static int nvme_set_instance(struct nvme_dev *dev) -{ - int instance, error; - - do { - if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) - return -ENODEV; - - spin_lock(&dev_list_lock); - error = ida_get_new(&nvme_instance_ida, &instance); - spin_unlock(&dev_list_lock); - } while (error == -EAGAIN); - - if (error) - return -ENODEV; - - dev->instance = instance; - return 0; -} - -static void nvme_release_instance(struct nvme_dev *dev) -{ - spin_lock(&dev_list_lock); - ida_remove(&nvme_instance_ida, dev->instance); - spin_unlock(&dev_list_lock); -} - -static void nvme_free_namespaces(struct nvme_dev *dev) -{ - struct nvme_ns *ns, *next; - - list_for_each_entry_safe(ns, next, &dev->namespaces, list) - nvme_free_namespace(ns); -} - -static void nvme_free_dev(struct kref *kref) -{ - struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref); - - put_device(dev->dev); - put_device(dev->device); - nvme_free_namespaces(dev); - nvme_release_instance(dev); - if (dev->tagset.tags) - blk_mq_free_tag_set(&dev->tagset); - if (dev->admin_q) - blk_put_queue(dev->admin_q); - kfree(dev->queues); - kfree(dev->entry); - kfree(dev); -} - -static int nvme_dev_open(struct inode *inode, struct file *f) -{ - struct nvme_dev *dev; - int instance = iminor(inode); - int ret = -ENODEV; - - spin_lock(&dev_list_lock); - list_for_each_entry(dev, &dev_list, node) { - if (dev->instance == instance) { - if (!dev->admin_q) { - ret = -EWOULDBLOCK; - break; - } - if (!kref_get_unless_zero(&dev->kref)) - break; - f->private_data = dev; - ret = 0; - break; - } - } - spin_unlock(&dev_list_lock); - - return ret; -} - -static int nvme_dev_release(struct inode *inode, struct file *f) -{ - struct nvme_dev *dev = f->private_data; - kref_put(&dev->kref, nvme_free_dev); - return 0; -} - -static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg) -{ - struct nvme_dev *dev = f->private_data; - struct nvme_ns *ns; - - switch (cmd) { - case NVME_IOCTL_ADMIN_CMD: - return nvme_user_cmd(dev, NULL, (void __user *)arg); - case NVME_IOCTL_IO_CMD: - if (list_empty(&dev->namespaces)) - return -ENOTTY; - ns = list_first_entry(&dev->namespaces, struct nvme_ns, list); - return nvme_user_cmd(dev, ns, (void __user *)arg); - case NVME_IOCTL_RESET: - dev_warn(dev->dev, "resetting controller\n"); - return nvme_reset(dev); - case NVME_IOCTL_SUBSYS_RESET: - return nvme_subsys_reset(dev); - default: - return -ENOTTY; - } -} - -static const struct file_operations nvme_dev_fops = { - .owner = THIS_MODULE, - .open = nvme_dev_open, - .release = nvme_dev_release, - .unlocked_ioctl = nvme_dev_ioctl, - .compat_ioctl = nvme_dev_ioctl, -}; - -static int nvme_dev_start(struct nvme_dev *dev) -{ - int result; - bool start_thread = false; - - result = nvme_dev_map(dev); - if (result) - return result; - - result = nvme_configure_admin_queue(dev); - if (result) - goto unmap; - - spin_lock(&dev_list_lock); - if (list_empty(&dev_list) && IS_ERR_OR_NULL(nvme_thread)) { - start_thread = true; - nvme_thread = NULL; - } - list_add(&dev->node, &dev_list); - spin_unlock(&dev_list_lock); - - if (start_thread) { - nvme_thread = kthread_run(nvme_kthread, NULL, "nvme"); - wake_up_all(&nvme_kthread_wait); - } else - wait_event_killable(nvme_kthread_wait, nvme_thread); - - if (IS_ERR_OR_NULL(nvme_thread)) { - result = nvme_thread ? PTR_ERR(nvme_thread) : -EINTR; - goto disable; - } - - nvme_init_queue(dev->queues[0], 0); - result = nvme_alloc_admin_tags(dev); - if (result) - goto disable; - - result = nvme_setup_io_queues(dev); - if (result) - goto free_tags; - - dev->event_limit = 1; - return result; - - free_tags: - nvme_dev_remove_admin(dev); - blk_put_queue(dev->admin_q); - dev->admin_q = NULL; - dev->queues[0]->tags = NULL; - disable: - nvme_disable_queue(dev, 0); - nvme_dev_list_remove(dev); - unmap: - nvme_dev_unmap(dev); - return result; -} - -static int nvme_remove_dead_ctrl(void *arg) -{ - struct nvme_dev *dev = (struct nvme_dev *)arg; - struct pci_dev *pdev = to_pci_dev(dev->dev); - - if (pci_get_drvdata(pdev)) - pci_stop_and_remove_bus_device_locked(pdev); - kref_put(&dev->kref, nvme_free_dev); - return 0; -} - -static void nvme_remove_disks(struct work_struct *ws) -{ - struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work); - - nvme_free_queues(dev, 1); - nvme_dev_remove(dev); -} - -static int nvme_dev_resume(struct nvme_dev *dev) -{ - int ret; - - ret = nvme_dev_start(dev); - if (ret) - return ret; - if (dev->online_queues < 2) { - spin_lock(&dev_list_lock); - dev->reset_workfn = nvme_remove_disks; - queue_work(nvme_workq, &dev->reset_work); - spin_unlock(&dev_list_lock); - } else { - nvme_unfreeze_queues(dev); - nvme_dev_add(dev); - } - return 0; -} - -static void nvme_dead_ctrl(struct nvme_dev *dev) -{ - dev_warn(dev->dev, "Device failed to resume\n"); - kref_get(&dev->kref); - if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d", - dev->instance))) { - dev_err(dev->dev, - "Failed to start controller remove task\n"); - kref_put(&dev->kref, nvme_free_dev); - } -} - -static void nvme_dev_reset(struct nvme_dev *dev) -{ - bool in_probe = work_busy(&dev->probe_work); - - nvme_dev_shutdown(dev); - - /* Synchronize with device probe so that work will see failure status - * and exit gracefully without trying to schedule another reset */ - flush_work(&dev->probe_work); - - /* Fail this device if reset occured during probe to avoid - * infinite initialization loops. */ - if (in_probe) { - nvme_dead_ctrl(dev); - return; - } - /* Schedule device resume asynchronously so the reset work is available - * to cleanup errors that may occur during reinitialization */ - schedule_work(&dev->probe_work); -} - -static void nvme_reset_failed_dev(struct work_struct *ws) -{ - struct nvme_dev *dev = container_of(ws, struct nvme_dev, reset_work); - nvme_dev_reset(dev); -} - -static void nvme_reset_workfn(struct work_struct *work) -{ - struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work); - dev->reset_workfn(work); -} - -static int nvme_reset(struct nvme_dev *dev) -{ - int ret = -EBUSY; - - if (!dev->admin_q || blk_queue_dying(dev->admin_q)) - return -ENODEV; - - spin_lock(&dev_list_lock); - if (!work_pending(&dev->reset_work)) { - dev->reset_workfn = nvme_reset_failed_dev; - queue_work(nvme_workq, &dev->reset_work); - ret = 0; - } - spin_unlock(&dev_list_lock); - - if (!ret) { - flush_work(&dev->reset_work); - flush_work(&dev->probe_work); - return 0; - } - - return ret; -} - -static ssize_t nvme_sysfs_reset(struct device *dev, - struct device_attribute *attr, const char *buf, - size_t count) -{ - struct nvme_dev *ndev = dev_get_drvdata(dev); - int ret; - - ret = nvme_reset(ndev); - if (ret < 0) - return ret; - - return count; -} -static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); - -static void nvme_async_probe(struct work_struct *work); -static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) -{ - int node, result = -ENOMEM; - struct nvme_dev *dev; - - node = dev_to_node(&pdev->dev); - if (node == NUMA_NO_NODE) - set_dev_node(&pdev->dev, 0); - - dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); - if (!dev) - return -ENOMEM; - dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry), - GFP_KERNEL, node); - if (!dev->entry) - goto free; - dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), - GFP_KERNEL, node); - if (!dev->queues) - goto free; - - INIT_LIST_HEAD(&dev->namespaces); - dev->reset_workfn = nvme_reset_failed_dev; - INIT_WORK(&dev->reset_work, nvme_reset_workfn); - dev->dev = get_device(&pdev->dev); - pci_set_drvdata(pdev, dev); - result = nvme_set_instance(dev); - if (result) - goto put_pci; - - result = nvme_setup_prp_pools(dev); - if (result) - goto release; - - kref_init(&dev->kref); - dev->device = device_create(nvme_class, &pdev->dev, - MKDEV(nvme_char_major, dev->instance), - dev, "nvme%d", dev->instance); - if (IS_ERR(dev->device)) { - result = PTR_ERR(dev->device); - goto release_pools; - } - get_device(dev->device); - dev_set_drvdata(dev->device, dev); - - result = device_create_file(dev->device, &dev_attr_reset_controller); - if (result) - goto put_dev; - - INIT_LIST_HEAD(&dev->node); - INIT_WORK(&dev->scan_work, nvme_dev_scan); - INIT_WORK(&dev->probe_work, nvme_async_probe); - schedule_work(&dev->probe_work); - return 0; - - put_dev: - device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance)); - put_device(dev->device); - release_pools: - nvme_release_prp_pools(dev); - release: - nvme_release_instance(dev); - put_pci: - put_device(dev->dev); - free: - kfree(dev->queues); - kfree(dev->entry); - kfree(dev); - return result; -} - -static void nvme_async_probe(struct work_struct *work) -{ - struct nvme_dev *dev = container_of(work, struct nvme_dev, probe_work); - - if (nvme_dev_resume(dev) && !work_busy(&dev->reset_work)) - nvme_dead_ctrl(dev); -} - -static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) -{ - struct nvme_dev *dev = pci_get_drvdata(pdev); - - if (prepare) - nvme_dev_shutdown(dev); - else - nvme_dev_resume(dev); -} - -static void nvme_shutdown(struct pci_dev *pdev) -{ - struct nvme_dev *dev = pci_get_drvdata(pdev); - nvme_dev_shutdown(dev); -} - -static void nvme_remove(struct pci_dev *pdev) -{ - struct nvme_dev *dev = pci_get_drvdata(pdev); - - spin_lock(&dev_list_lock); - list_del_init(&dev->node); - spin_unlock(&dev_list_lock); - - pci_set_drvdata(pdev, NULL); - flush_work(&dev->probe_work); - flush_work(&dev->reset_work); - flush_work(&dev->scan_work); - device_remove_file(dev->device, &dev_attr_reset_controller); - nvme_dev_remove(dev); - nvme_dev_shutdown(dev); - nvme_dev_remove_admin(dev); - device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance)); - nvme_free_queues(dev, 0); - nvme_release_cmb(dev); - nvme_release_prp_pools(dev); - kref_put(&dev->kref, nvme_free_dev); -} - -/* These functions are yet to be implemented */ -#define nvme_error_detected NULL -#define nvme_dump_registers NULL -#define nvme_link_reset NULL -#define nvme_slot_reset NULL -#define nvme_error_resume NULL - -#ifdef CONFIG_PM_SLEEP -static int nvme_suspend(struct device *dev) -{ - struct pci_dev *pdev = to_pci_dev(dev); - struct nvme_dev *ndev = pci_get_drvdata(pdev); - - nvme_dev_shutdown(ndev); - return 0; -} - -static int nvme_resume(struct device *dev) -{ - struct pci_dev *pdev = to_pci_dev(dev); - struct nvme_dev *ndev = pci_get_drvdata(pdev); - - if (nvme_dev_resume(ndev) && !work_busy(&ndev->reset_work)) { - ndev->reset_workfn = nvme_reset_failed_dev; - queue_work(nvme_workq, &ndev->reset_work); - } - return 0; -} -#endif - -static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); - -static const struct pci_error_handlers nvme_err_handler = { - .error_detected = nvme_error_detected, - .mmio_enabled = nvme_dump_registers, - .link_reset = nvme_link_reset, - .slot_reset = nvme_slot_reset, - .resume = nvme_error_resume, - .reset_notify = nvme_reset_notify, -}; - -/* Move to pci_ids.h later */ -#define PCI_CLASS_STORAGE_EXPRESS 0x010802 - -static const struct pci_device_id nvme_id_table[] = { - { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, - { 0, } -}; -MODULE_DEVICE_TABLE(pci, nvme_id_table); - -static struct pci_driver nvme_driver = { - .name = "nvme", - .id_table = nvme_id_table, - .probe = nvme_probe, - .remove = nvme_remove, - .shutdown = nvme_shutdown, - .driver = { - .pm = &nvme_dev_pm_ops, - }, - .err_handler = &nvme_err_handler, -}; - -static int __init nvme_init(void) -{ - int result; - - init_waitqueue_head(&nvme_kthread_wait); - - nvme_workq = create_singlethread_workqueue("nvme"); - if (!nvme_workq) - return -ENOMEM; - - result = register_blkdev(nvme_major, "nvme"); - if (result < 0) - goto kill_workq; - else if (result > 0) - nvme_major = result; - - result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme", - &nvme_dev_fops); - if (result < 0) - goto unregister_blkdev; - else if (result > 0) - nvme_char_major = result; - - nvme_class = class_create(THIS_MODULE, "nvme"); - if (IS_ERR(nvme_class)) { - result = PTR_ERR(nvme_class); - goto unregister_chrdev; - } - - result = pci_register_driver(&nvme_driver); - if (result) - goto destroy_class; - return 0; - - destroy_class: - class_destroy(nvme_class); - unregister_chrdev: - __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); - unregister_blkdev: - unregister_blkdev(nvme_major, "nvme"); - kill_workq: - destroy_workqueue(nvme_workq); - return result; -} - -static void __exit nvme_exit(void) -{ - pci_unregister_driver(&nvme_driver); - unregister_blkdev(nvme_major, "nvme"); - destroy_workqueue(nvme_workq); - class_destroy(nvme_class); - __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); - BUG_ON(nvme_thread && !IS_ERR(nvme_thread)); - _nvme_check_size(); -} - -MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>"); -MODULE_LICENSE("GPL"); -MODULE_VERSION("1.0"); -module_init(nvme_init); -module_exit(nvme_exit); |