+++ /dev/null
-/*
- * 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/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 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_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;
- volatile struct nvme_completion *cqes;
- 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;
- struct blk_mq_hw_ctx *hctx;
-};
-
-/*
- * 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(nvmeq->hctx);
- nvmeq->hctx = hctx;
- hctx->driver_data = nvmeq;
- return 0;
-}
-
-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 void nvme_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
-{
- struct nvme_queue *nvmeq = hctx->driver_data;
-
- nvmeq->hctx = NULL;
-}
-
-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 % dev->queue_count) + 1];
-
- if (!nvmeq->hctx)
- nvmeq->hctx = hctx;
-
- /* nvmeq queues are shared between namespaces. We assume here that
- * blk-mq map the tags so they match up with the nvme queue tags. */
- WARN_ON(nvmeq->hctx->tags != 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)
- 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_hctx_request(nvmeq->hctx, 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_hctx_request(nvmeq->hctx, cmdinfo->req);
-}
-
-static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq,
- unsigned int tag)
-{
- struct blk_mq_hw_ctx *hctx = nvmeq->hctx;
- struct request *req = blk_mq_tag_to_rq(hctx->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 int __nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
-{
- u16 tail = nvmeq->sq_tail;
-
- memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
- if (++tail == nvmeq->q_depth)
- tail = 0;
- writel(tail, nvmeq->q_db);
- nvmeq->sq_tail = tail;
-
- return 0;
-}
-
-static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
-{
- unsigned long flags;
- int ret;
- spin_lock_irqsave(&nvmeq->q_lock, flags);
- ret = __nvme_submit_cmd(nvmeq, cmd);
- spin_unlock_irqrestore(&nvmeq->q_lock, flags);
- return ret;
-}
-
-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);
-}
-
-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;
- }
- req->errors = nvme_error_status(status);
- } else
- req->errors = 0;
-
- if (cmd_rq->aborted)
- dev_warn(&nvmeq->dev->pci_dev->dev,
- "completing aborted command with status:%04x\n",
- status);
-
- if (iod->nents) {
- dma_unmap_sg(&nvmeq->dev->pci_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->pci_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);
-}
-
-/* length is in bytes. gfp flags indicates whether we may sleep. */
-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;
-}
-
-/*
- * 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 = &nvmeq->sq_cmds[nvmeq->sq_tail];
-
- 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);
-
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
-}
-
-static void nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns,
- int cmdid)
-{
- struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
-
- 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);
-
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
-}
-
-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;
-
- cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
- 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 (blk_integrity_rq(req)) {
- cmnd->rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg));
- 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;
- }
- } else if (ns->ms)
- control |= NVME_RW_PRINFO_PRACT;
-
- cmnd->rw.control = cpu_to_le16(control);
- cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
-
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
-
- return 0;
-}
-
-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 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->ms && !blk_integrity_rq(req)) {
- if (!(ns->pi_type && ns->ms == 8)) {
- req->errors = -EFAULT;
- blk_mq_complete_request(req);
- return BLK_MQ_RQ_QUEUE_OK;
- }
- }
-
- iod = nvme_alloc_iod(req, ns->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(nvmeq->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(nvmeq->dev, iod, blk_rq_bytes(req), GFP_ATOMIC)) {
- dma_unmap_sg(&nvmeq->dev->pci_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_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(nvmeq->dev, iod);
- return BLK_MQ_RQ_QUEUE_ERROR;
- retry_cmd:
- nvme_free_iod(nvmeq->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;
-}
-
-/* Admin queue isn't initialized as a request queue. If at some point this
- * happens anyway, make sure to notify the user */
-static int nvme_admin_queue_rq(struct blk_mq_hw_ctx *hctx,
- const struct blk_mq_queue_data *bd)
-{
- WARN_ON_ONCE(1);
- return BLK_MQ_RQ_QUEUE_ERROR;
-}
-
-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;
-}
-
-struct sync_cmd_info {
- struct task_struct *task;
- u32 result;
- int status;
-};
-
-static void sync_completion(struct nvme_queue *nvmeq, void *ctx,
- struct nvme_completion *cqe)
-{
- struct sync_cmd_info *cmdinfo = ctx;
- cmdinfo->result = le32_to_cpup(&cqe->result);
- cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
- wake_up_process(cmdinfo->task);
-}
-
-/*
- * 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
- */
-static int nvme_submit_sync_cmd(struct request *req, struct nvme_command *cmd,
- u32 *result, unsigned timeout)
-{
- struct sync_cmd_info cmdinfo;
- struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req);
- struct nvme_queue *nvmeq = cmd_rq->nvmeq;
-
- cmdinfo.task = current;
- cmdinfo.status = -EINTR;
-
- cmd->common.command_id = req->tag;
-
- nvme_set_info(cmd_rq, &cmdinfo, sync_completion);
-
- set_current_state(TASK_UNINTERRUPTIBLE);
- nvme_submit_cmd(nvmeq, cmd);
- schedule();
-
- if (result)
- *result = cmdinfo.result;
- return cmdinfo.status;
-}
-
-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_hctx_request(nvmeq->hctx, req);
- return __nvme_submit_cmd(nvmeq, &c);
-}
-
-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;
-
- return nvme_submit_cmd(nvmeq, cmd);
-}
-
-static int __nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
- u32 *result, unsigned timeout)
-{
- int res;
- struct request *req;
-
- req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_KERNEL, false);
- if (IS_ERR(req))
- return PTR_ERR(req);
- res = nvme_submit_sync_cmd(req, cmd, result, timeout);
- blk_mq_free_request(req);
- return res;
-}
-
-int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
- u32 *result)
-{
- return __nvme_submit_admin_cmd(dev, cmd, result, ADMIN_TIMEOUT);
-}
-
-int nvme_submit_io_cmd(struct nvme_dev *dev, struct nvme_ns *ns,
- struct nvme_command *cmd, u32 *result)
-{
- int res;
- struct request *req;
-
- req = blk_mq_alloc_request(ns->queue, WRITE, (GFP_KERNEL|__GFP_WAIT),
- false);
- if (IS_ERR(req))
- return PTR_ERR(req);
- res = nvme_submit_sync_cmd(req, cmd, result, NVME_IO_TIMEOUT);
- blk_mq_free_request(req);
- return res;
-}
-
-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_admin_cmd(dev, &c, NULL);
-}
-
-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;
-
- 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_admin_cmd(dev, &c, NULL);
-}
-
-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;
-
- 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_admin_cmd(dev, &c, NULL);
-}
-
-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(struct nvme_dev *dev, unsigned nsid, unsigned cns,
- dma_addr_t dma_addr)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.identify.opcode = nvme_admin_identify;
- c.identify.nsid = cpu_to_le32(nsid);
- c.identify.prp1 = cpu_to_le64(dma_addr);
- c.identify.cns = cpu_to_le32(cns);
-
- return nvme_submit_admin_cmd(dev, &c, NULL);
-}
-
-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_admin_cmd(dev, &c, result);
-}
-
-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_admin_cmd(dev, &c, result);
-}
-
-/**
- * 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->pci_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);
- if (nvme_submit_cmd(dev->queues[0], &cmd) < 0) {
- dev_warn(nvmeq->q_dmadev,
- "Could not abort I/O %d QID %d",
- req->tag, nvmeq->qid);
- blk_mq_free_request(abort_req);
- }
-}
-
-static void nvme_cancel_queue_ios(struct blk_mq_hw_ctx *hctx,
- 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);
- 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)
-{
- struct blk_mq_hw_ctx *hctx = nvmeq->hctx;
-
- spin_lock_irq(&nvmeq->q_lock);
- if (hctx && hctx->tags)
- blk_mq_tag_busy_iter(hctx, 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 struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
- int depth)
-{
- struct device *dmadev = &dev->pci_dev->dev;
- struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq), GFP_KERNEL);
- if (!nvmeq)
- return NULL;
-
- nvmeq->cqes = dma_zalloc_coherent(dmadev, CQ_SIZE(depth),
- &nvmeq->cq_dma_addr, GFP_KERNEL);
- if (!nvmeq->cqes)
- goto free_nvmeq;
-
- nvmeq->sq_cmds = dma_alloc_coherent(dmadev, SQ_SIZE(depth),
- &nvmeq->sq_dma_addr, GFP_KERNEL);
- if (!nvmeq->sq_cmds)
- goto free_cqdma;
-
- nvmeq->q_dmadev = dmadev;
- 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;
- dev->queue_count++;
- dev->queues[qid] = nvmeq;
-
- return nvmeq;
-
- free_cqdma:
- dma_free_coherent(dmadev, 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->pci_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->pci_dev->dev,
- "Device shutdown incomplete; abort shutdown\n");
- return -ENODEV;
- }
- }
-
- return 0;
-}
-
-static struct blk_mq_ops nvme_mq_admin_ops = {
- .queue_rq = nvme_admin_queue_rq,
- .map_queue = blk_mq_map_queue,
- .init_hctx = nvme_admin_init_hctx,
- .exit_hctx = nvme_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,
- .exit_hctx = nvme_exit_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->pci_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);
- 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->pci_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->pci_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;
- }
-
- 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)
- goto free_nvmeq;
-
- return result;
-
- free_nvmeq:
- nvme_free_queues(dev, 0);
- return result;
-}
-
-struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
- unsigned long addr, unsigned length)
-{
- int i, err, count, nents, offset;
- struct scatterlist *sg;
- struct page **pages;
- struct nvme_iod *iod;
-
- if (addr & 3)
- return ERR_PTR(-EINVAL);
- if (!length || length > INT_MAX - PAGE_SIZE)
- return ERR_PTR(-EINVAL);
-
- offset = offset_in_page(addr);
- count = DIV_ROUND_UP(offset + length, PAGE_SIZE);
- pages = kcalloc(count, sizeof(*pages), GFP_KERNEL);
- if (!pages)
- return ERR_PTR(-ENOMEM);
-
- err = get_user_pages_fast(addr, count, 1, pages);
- if (err < count) {
- count = err;
- err = -EFAULT;
- goto put_pages;
- }
-
- err = -ENOMEM;
- iod = __nvme_alloc_iod(count, length, dev, 0, GFP_KERNEL);
- if (!iod)
- goto put_pages;
-
- sg = iod->sg;
- sg_init_table(sg, count);
- for (i = 0; i < count; i++) {
- sg_set_page(&sg[i], pages[i],
- min_t(unsigned, length, PAGE_SIZE - offset),
- offset);
- length -= (PAGE_SIZE - offset);
- offset = 0;
- }
- sg_mark_end(&sg[i - 1]);
- iod->nents = count;
-
- nents = dma_map_sg(&dev->pci_dev->dev, sg, count,
- write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
- if (!nents)
- goto free_iod;
-
- kfree(pages);
- return iod;
-
- free_iod:
- kfree(iod);
- put_pages:
- for (i = 0; i < count; i++)
- put_page(pages[i]);
- kfree(pages);
- return ERR_PTR(err);
-}
-
-void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
- struct nvme_iod *iod)
-{
- int i;
-
- dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
- write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-
- for (i = 0; i < iod->nents; i++)
- put_page(sg_page(&iod->sg[i]));
-}
-
-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, prp_len;
- int status, write;
- struct nvme_iod *iod;
- dma_addr_t meta_dma = 0;
- void *meta = NULL;
- void __user *metadata;
-
- if (copy_from_user(&io, uio, sizeof(io)))
- return -EFAULT;
- length = (io.nblocks + 1) << ns->lba_shift;
- meta_len = (io.nblocks + 1) * ns->ms;
-
- if (meta_len && ((io.metadata & 3) || !io.metadata) && !ns->ext)
- return -EINVAL;
- else if (meta_len && ns->ext) {
- length += meta_len;
- meta_len = 0;
- }
-
- metadata = (void __user *)(unsigned long)io.metadata;
-
- write = io.opcode & 1;
-
- switch (io.opcode) {
- case nvme_cmd_write:
- case nvme_cmd_read:
- case nvme_cmd_compare:
- iod = nvme_map_user_pages(dev, write, io.addr, length);
- break;
- default:
- return -EINVAL;
- }
-
- if (IS_ERR(iod))
- return PTR_ERR(iod);
-
- prp_len = nvme_setup_prps(dev, iod, length, GFP_KERNEL);
- if (length != prp_len) {
- status = -ENOMEM;
- goto unmap;
- }
- if (meta_len) {
- meta = dma_alloc_coherent(&dev->pci_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.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
- c.rw.prp2 = cpu_to_le64(iod->first_dma);
- c.rw.metadata = cpu_to_le64(meta_dma);
- status = nvme_submit_io_cmd(dev, ns, &c, NULL);
- unmap:
- nvme_unmap_user_pages(dev, write, iod);
- nvme_free_iod(dev, iod);
- if (meta) {
- if (status == NVME_SC_SUCCESS && !write) {
- if (copy_to_user(metadata, meta, meta_len))
- status = -EFAULT;
- }
- dma_free_coherent(&dev->pci_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;
- int status, length;
- struct nvme_iod *uninitialized_var(iod);
- unsigned timeout;
-
- 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);
-
- length = cmd.data_len;
- if (cmd.data_len) {
- iod = nvme_map_user_pages(dev, cmd.opcode & 1, cmd.addr,
- length);
- if (IS_ERR(iod))
- return PTR_ERR(iod);
- length = nvme_setup_prps(dev, iod, length, GFP_KERNEL);
- c.common.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
- c.common.prp2 = cpu_to_le64(iod->first_dma);
- }
-
- timeout = cmd.timeout_ms ? msecs_to_jiffies(cmd.timeout_ms) :
- ADMIN_TIMEOUT;
-
- if (length != cmd.data_len)
- status = -ENOMEM;
- else if (ns) {
- struct request *req;
-
- req = blk_mq_alloc_request(ns->queue, WRITE,
- (GFP_KERNEL|__GFP_WAIT), false);
- if (IS_ERR(req))
- status = PTR_ERR(req);
- else {
- status = nvme_submit_sync_cmd(req, &c, &cmd.result,
- timeout);
- blk_mq_free_request(req);
- }
- } else
- status = __nvme_submit_admin_cmd(dev, &c, &cmd.result, timeout);
-
- if (cmd.data_len) {
- nvme_unmap_user_pages(dev, cmd.opcode & 1, iod);
- nvme_free_iod(dev, iod);
- }
-
- if ((status >= 0) && copy_to_user(&ucmd->result, &cmd.result,
- sizeof(cmd.result)))
- status = -EFAULT;
-
- return status;
-}
-
-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;
- ns->queue->limits.max_discard_sectors = 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;
- dma_addr_t dma_addr;
- u8 lbaf, pi_type;
- u16 old_ms;
- unsigned short bs;
-
- id = dma_alloc_coherent(&dev->pci_dev->dev, 4096, &dma_addr,
- GFP_KERNEL);
- if (!id) {
- dev_warn(&dev->pci_dev->dev, "%s: Memory alocation failure\n",
- __func__);
- return 0;
- }
- if (nvme_identify(dev, ns->ns_id, 0, dma_addr)) {
- dev_warn(&dev->pci_dev->dev,
- "identify failed ns:%d, setting capacity to 0\n",
- ns->ns_id);
- memset(id, 0, sizeof(*id));
- }
-
- 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 (id->ncap == 0 || (ns->ms && !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);
-
- dma_free_coherent(&dev->pci_dev->dev, 4096, id, dma_addr);
- 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;
- if (readl(&dev->bar->csts) & NVME_CSTS_CFS) {
- if (work_busy(&dev->reset_work))
- continue;
- list_del_init(&dev->node);
- dev_warn(&dev->pci_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->pci_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);
- queue_flag_set_unlocked(QUEUE_FLAG_SG_GAPS, 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);
- 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);
-
- 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);
- nvme_revalidate_disk(ns->disk);
- add_disk(ns->disk);
- if (ns->ms)
- revalidate_disk(ns->disk);
- return;
- 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->pci_dev->dev, "Could not set queue count (%d)\n",
- status);
- return 0;
- }
- return min(result & 0xffff, result >> 16) + 1;
-}
-
-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 = dev->pci_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;
-
- 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)
- 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;
-}
-
-/*
- * 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 = dev->pci_dev;
- int res;
- unsigned nn, i;
- struct nvme_id_ctrl *ctrl;
- void *mem;
- dma_addr_t dma_addr;
- int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12;
-
- mem = dma_alloc_coherent(&pdev->dev, 4096, &dma_addr, GFP_KERNEL);
- if (!mem)
- return -ENOMEM;
-
- res = nvme_identify(dev, 0, 1, dma_addr);
- if (res) {
- dev_err(&pdev->dev, "Identify Controller failed (%d)\n", res);
- dma_free_coherent(&dev->pci_dev->dev, 4096, mem, dma_addr);
- return -EIO;
- }
-
- ctrl = mem;
- nn = le32_to_cpup(&ctrl->nn);
- 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;
- }
- dma_free_coherent(&dev->pci_dev->dev, 4096, mem, dma_addr);
-
- 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->pci_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;
-
- for (i = 1; i <= nn; i++)
- nvme_alloc_ns(dev, i);
-
- return 0;
-}
-
-static int nvme_dev_map(struct nvme_dev *dev)
-{
- u64 cap;
- int bars, result = -ENOMEM;
- struct pci_dev *pdev = dev->pci_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(&pdev->dev, DMA_BIT_MASK(64)) &&
- dma_set_mask_and_coherent(&pdev->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;
-
- 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)
-{
- if (dev->pci_dev->msi_enabled)
- pci_disable_msi(dev->pci_dev);
- else if (dev->pci_dev->msix_enabled)
- pci_disable_msix(dev->pci_dev);
-
- if (dev->bar) {
- iounmap(dev->bar);
- dev->bar = NULL;
- pci_release_regions(dev->pci_dev);
- }
-
- if (pci_is_enabled(dev->pci_dev))
- pci_disable_device(dev->pci_dev);
-}
-
-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->pci_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(ns->queue->queue_lock);
- queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
- spin_unlock(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) {
- if (ns->disk->flags & GENHD_FL_UP) {
- if (blk_get_integrity(ns->disk))
- blk_integrity_unregister(ns->disk);
- del_gendisk(ns->disk);
- }
- if (!blk_queue_dying(ns->queue)) {
- blk_mq_abort_requeue_list(ns->queue);
- blk_cleanup_queue(ns->queue);
- }
- }
-}
-
-static int nvme_setup_prp_pools(struct nvme_dev *dev)
-{
- struct device *dmadev = &dev->pci_dev->dev;
- dev->prp_page_pool = dma_pool_create("prp list page", dmadev,
- 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", dmadev,
- 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) {
- 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 void nvme_free_dev(struct kref *kref)
-{
- struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref);
-
- pci_dev_put(dev->pci_dev);
- put_device(dev->device);
- nvme_free_namespaces(dev);
- nvme_release_instance(dev);
- blk_mq_free_tag_set(&dev->tagset);
- 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);
- 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 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->hctx)
- continue;
-
- irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector,
- nvmeq->hctx->cpumask);
- }
-}
-
-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;
-
- nvme_set_irq_hints(dev);
-
- dev->event_limit = 1;
- return result;
-
- free_tags:
- nvme_dev_remove_admin(dev);
- 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 = dev->pci_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_set_irq_hints(dev);
- }
- return 0;
-}
-
-static void nvme_dev_reset(struct nvme_dev *dev)
-{
- nvme_dev_shutdown(dev);
- if (nvme_dev_resume(dev)) {
- dev_warn(&dev->pci_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->pci_dev->dev,
- "Failed to start controller remove task\n");
- kref_put(&dev->kref, nvme_free_dev);
- }
- }
-}
-
-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 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->pci_dev = pci_dev_get(pdev);
- 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);
-
- INIT_LIST_HEAD(&dev->node);
- INIT_WORK(&dev->probe_work, nvme_async_probe);
- schedule_work(&dev->probe_work);
- return 0;
-
- release_pools:
- nvme_release_prp_pools(dev);
- release:
- nvme_release_instance(dev);
- put_pci:
- pci_dev_put(dev->pci_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);
- int result;
-
- result = nvme_dev_start(dev);
- if (result)
- goto reset;
-
- if (dev->online_queues > 1)
- result = nvme_dev_add(dev);
- if (result)
- goto reset;
-
- nvme_set_irq_hints(dev);
- return;
- reset:
- if (!work_busy(&dev->reset_work)) {
- dev->reset_workfn = nvme_reset_failed_dev;
- queue_work(nvme_workq, &dev->reset_work);
- }
-}
-
-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);
- nvme_dev_shutdown(dev);
- nvme_dev_remove(dev);
- nvme_dev_remove_admin(dev);
- device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance));
- nvme_free_queues(dev, 0);
- 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);
Code Review / kvmfornfv.git / blobdiff