pci.c 64.1 KB
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/*
 * NVM Express device driver
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 * Copyright (c) 2011-2014, Intel Corporation.
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 *
 * 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.
 */

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#include <linux/aer.h>
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#include <linux/bitops.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/blk-mq-pci.h>
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#include <linux/dmi.h>
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#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <linux/poison.h>
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#include <linux/t10-pi.h>
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#include <linux/timer.h>
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#include <linux/types.h>
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#include <linux/io-64-nonatomic-lo-hi.h>
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#include <asm/unaligned.h>
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#include <linux/sed-opal.h>
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#include "nvme.h"

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#define SQ_SIZE(depth)		(depth * sizeof(struct nvme_command))
#define CQ_SIZE(depth)		(depth * sizeof(struct nvme_completion))
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/*
 * We handle AEN commands ourselves and don't even let the
 * block layer know about them.
 */
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#define NVME_AQ_BLKMQ_DEPTH	(NVME_AQ_DEPTH - NVME_NR_AERS)
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static int use_threaded_interrupts;
module_param(use_threaded_interrupts, int, 0);

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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");

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static unsigned int max_host_mem_size_mb = 128;
module_param(max_host_mem_size_mb, uint, 0444);
MODULE_PARM_DESC(max_host_mem_size_mb,
	"Maximum Host Memory Buffer (HMB) size per controller (in MiB)");
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static int io_queue_depth_set(const char *val, const struct kernel_param *kp);
static const struct kernel_param_ops io_queue_depth_ops = {
	.set = io_queue_depth_set,
	.get = param_get_int,
};

static int io_queue_depth = 1024;
module_param_cb(io_queue_depth, &io_queue_depth_ops, &io_queue_depth, 0644);
MODULE_PARM_DESC(io_queue_depth, "set io queue depth, should >= 2");

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struct nvme_dev;
struct nvme_queue;
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static void nvme_process_cq(struct nvme_queue *nvmeq);
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static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown);
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/*
 * Represents an NVM Express device.  Each nvme_dev is a PCI function.
 */
struct nvme_dev {
	struct nvme_queue **queues;
	struct blk_mq_tag_set tagset;
	struct blk_mq_tag_set admin_tagset;
	u32 __iomem *dbs;
	struct device *dev;
	struct dma_pool *prp_page_pool;
	struct dma_pool *prp_small_pool;
	unsigned online_queues;
	unsigned max_qid;
	int q_depth;
	u32 db_stride;
	void __iomem *bar;
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	unsigned long bar_mapped_size;
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	struct work_struct remove_work;
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	struct mutex shutdown_lock;
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	bool subsystem;
	void __iomem *cmb;
	dma_addr_t cmb_dma_addr;
	u64 cmb_size;
	u32 cmbsz;
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	u32 cmbloc;
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	struct nvme_ctrl ctrl;
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	struct completion ioq_wait;
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	/* shadow doorbell buffer support: */
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	u32 *dbbuf_dbs;
	dma_addr_t dbbuf_dbs_dma_addr;
	u32 *dbbuf_eis;
	dma_addr_t dbbuf_eis_dma_addr;
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	/* host memory buffer support: */
	u64 host_mem_size;
	u32 nr_host_mem_descs;
	struct nvme_host_mem_buf_desc *host_mem_descs;
	void **host_mem_desc_bufs;
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};
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static int io_queue_depth_set(const char *val, const struct kernel_param *kp)
{
	int n = 0, ret;

	ret = kstrtoint(val, 10, &n);
	if (ret != 0 || n < 2)
		return -EINVAL;

	return param_set_int(val, kp);
}

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static inline unsigned int sq_idx(unsigned int qid, u32 stride)
{
	return qid * 2 * stride;
}

static inline unsigned int cq_idx(unsigned int qid, u32 stride)
{
	return (qid * 2 + 1) * stride;
}

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static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl)
{
	return container_of(ctrl, struct nvme_dev, ctrl);
}

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/*
 * 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;
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	struct nvme_dev *dev;
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	spinlock_t q_lock;
	struct nvme_command *sq_cmds;
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	struct nvme_command __iomem *sq_cmds_io;
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	volatile struct nvme_completion *cqes;
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	struct blk_mq_tags **tags;
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	dma_addr_t sq_dma_addr;
	dma_addr_t cq_dma_addr;
	u32 __iomem *q_db;
	u16 q_depth;
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	s16 cq_vector;
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	u16 sq_tail;
	u16 cq_head;
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	u16 qid;
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	u8 cq_phase;
	u8 cqe_seen;
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	u32 *dbbuf_sq_db;
	u32 *dbbuf_cq_db;
	u32 *dbbuf_sq_ei;
	u32 *dbbuf_cq_ei;
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};

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/*
 * The nvme_iod describes the data in an I/O, including the list of PRP
 * entries.  You can't see it in this data structure because C doesn't let
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 * me express that.  Use nvme_init_iod to ensure there's enough space
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 * allocated to store the PRP list.
 */
struct nvme_iod {
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	struct nvme_request req;
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	struct nvme_queue *nvmeq;
	int aborted;
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	int npages;		/* In the PRP list. 0 means small pool in use */
	int nents;		/* Used in scatterlist */
	int length;		/* Of data, in bytes */
	dma_addr_t first_dma;
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	struct scatterlist meta_sg; /* metadata requires single contiguous buffer */
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	struct scatterlist *sg;
	struct scatterlist inline_sg[0];
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};

/*
 * 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);
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	BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
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	BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
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	BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
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	BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE);
	BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE);
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	BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
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	BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
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	BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64);
}

static inline unsigned int nvme_dbbuf_size(u32 stride)
{
	return ((num_possible_cpus() + 1) * 8 * stride);
}

static int nvme_dbbuf_dma_alloc(struct nvme_dev *dev)
{
	unsigned int mem_size = nvme_dbbuf_size(dev->db_stride);

	if (dev->dbbuf_dbs)
		return 0;

	dev->dbbuf_dbs = dma_alloc_coherent(dev->dev, mem_size,
					    &dev->dbbuf_dbs_dma_addr,
					    GFP_KERNEL);
	if (!dev->dbbuf_dbs)
		return -ENOMEM;
	dev->dbbuf_eis = dma_alloc_coherent(dev->dev, mem_size,
					    &dev->dbbuf_eis_dma_addr,
					    GFP_KERNEL);
	if (!dev->dbbuf_eis) {
		dma_free_coherent(dev->dev, mem_size,
				  dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr);
		dev->dbbuf_dbs = NULL;
		return -ENOMEM;
	}

	return 0;
}

static void nvme_dbbuf_dma_free(struct nvme_dev *dev)
{
	unsigned int mem_size = nvme_dbbuf_size(dev->db_stride);

	if (dev->dbbuf_dbs) {
		dma_free_coherent(dev->dev, mem_size,
				  dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr);
		dev->dbbuf_dbs = NULL;
	}
	if (dev->dbbuf_eis) {
		dma_free_coherent(dev->dev, mem_size,
				  dev->dbbuf_eis, dev->dbbuf_eis_dma_addr);
		dev->dbbuf_eis = NULL;
	}
}

static void nvme_dbbuf_init(struct nvme_dev *dev,
			    struct nvme_queue *nvmeq, int qid)
{
	if (!dev->dbbuf_dbs || !qid)
		return;

	nvmeq->dbbuf_sq_db = &dev->dbbuf_dbs[sq_idx(qid, dev->db_stride)];
	nvmeq->dbbuf_cq_db = &dev->dbbuf_dbs[cq_idx(qid, dev->db_stride)];
	nvmeq->dbbuf_sq_ei = &dev->dbbuf_eis[sq_idx(qid, dev->db_stride)];
	nvmeq->dbbuf_cq_ei = &dev->dbbuf_eis[cq_idx(qid, dev->db_stride)];
}

static void nvme_dbbuf_set(struct nvme_dev *dev)
{
	struct nvme_command c;

	if (!dev->dbbuf_dbs)
		return;

	memset(&c, 0, sizeof(c));
	c.dbbuf.opcode = nvme_admin_dbbuf;
	c.dbbuf.prp1 = cpu_to_le64(dev->dbbuf_dbs_dma_addr);
	c.dbbuf.prp2 = cpu_to_le64(dev->dbbuf_eis_dma_addr);

	if (nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0)) {
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		dev_warn(dev->ctrl.device, "unable to set dbbuf\n");
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		/* Free memory and continue on */
		nvme_dbbuf_dma_free(dev);
	}
}

static inline int nvme_dbbuf_need_event(u16 event_idx, u16 new_idx, u16 old)
{
	return (u16)(new_idx - event_idx - 1) < (u16)(new_idx - old);
}

/* Update dbbuf and return true if an MMIO is required */
static bool nvme_dbbuf_update_and_check_event(u16 value, u32 *dbbuf_db,
					      volatile u32 *dbbuf_ei)
{
	if (dbbuf_db) {
		u16 old_value;

		/*
		 * Ensure that the queue is written before updating
		 * the doorbell in memory
		 */
		wmb();

		old_value = *dbbuf_db;
		*dbbuf_db = value;

		if (!nvme_dbbuf_need_event(*dbbuf_ei, value, old_value))
			return false;
	}

	return true;
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}

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/*
 * Max size of iod being embedded in the request payload
 */
#define NVME_INT_PAGES		2
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#define NVME_INT_BYTES(dev)	(NVME_INT_PAGES * (dev)->ctrl.page_size)
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/*
 * 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)
{
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	unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size,
				      dev->ctrl.page_size);
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	return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
}

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static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev,
		unsigned int size, unsigned int nseg)
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{
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	return sizeof(__le64 *) * nvme_npages(size, dev) +
			sizeof(struct scatterlist) * nseg;
}
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static unsigned int nvme_cmd_size(struct nvme_dev *dev)
{
	return sizeof(struct nvme_iod) +
		nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES);
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}

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static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
				unsigned int hctx_idx)
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{
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	struct nvme_dev *dev = data;
	struct nvme_queue *nvmeq = dev->queues[0];

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	WARN_ON(hctx_idx != 0);
	WARN_ON(dev->admin_tagset.tags[0] != hctx->tags);
	WARN_ON(nvmeq->tags);

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	hctx->driver_data = nvmeq;
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	nvmeq->tags = &dev->admin_tagset.tags[0];
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	return 0;
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}

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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;
}

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static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
			  unsigned int hctx_idx)
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{
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	struct nvme_dev *dev = data;
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	struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];
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	if (!nvmeq->tags)
		nvmeq->tags = &dev->tagset.tags[hctx_idx];
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	WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags);
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	hctx->driver_data = nvmeq;
	return 0;
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}

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static int nvme_init_request(struct blk_mq_tag_set *set, struct request *req,
		unsigned int hctx_idx, unsigned int numa_node)
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{
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	struct nvme_dev *dev = set->driver_data;
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	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
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	int queue_idx = (set == &dev->tagset) ? hctx_idx + 1 : 0;
	struct nvme_queue *nvmeq = dev->queues[queue_idx];
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	BUG_ON(!nvmeq);
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	iod->nvmeq = nvmeq;
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	return 0;
}

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static int nvme_pci_map_queues(struct blk_mq_tag_set *set)
{
	struct nvme_dev *dev = set->driver_data;

	return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev));
}

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/**
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 * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
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 * @nvmeq: The queue to use
 * @cmd: The command to send
 *
 * Safe to use from interrupt context
 */
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static void __nvme_submit_cmd(struct nvme_queue *nvmeq,
						struct nvme_command *cmd)
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{
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	u16 tail = nvmeq->sq_tail;

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	if (nvmeq->sq_cmds_io)
		memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd));
	else
		memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));

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	if (++tail == nvmeq->q_depth)
		tail = 0;
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	if (nvme_dbbuf_update_and_check_event(tail, nvmeq->dbbuf_sq_db,
					      nvmeq->dbbuf_sq_ei))
		writel(tail, nvmeq->q_db);
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	nvmeq->sq_tail = tail;
}

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static __le64 **iod_list(struct request *req)
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{
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	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
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	return (__le64 **)(iod->sg + blk_rq_nr_phys_segments(req));
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}

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static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev)
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{
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	struct nvme_iod *iod = blk_mq_rq_to_pdu(rq);
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	int nseg = blk_rq_nr_phys_segments(rq);
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	unsigned int size = blk_rq_payload_bytes(rq);
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	if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) {
		iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC);
		if (!iod->sg)
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			return BLK_STS_RESOURCE;
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	} else {
		iod->sg = iod->inline_sg;
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	}

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	iod->aborted = 0;
	iod->npages = -1;
	iod->nents = 0;
	iod->length = size;
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	return BLK_STS_OK;
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}

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static void nvme_free_iod(struct nvme_dev *dev, struct request *req)
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{
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	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
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	const int last_prp = dev->ctrl.page_size / 8 - 1;
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	int i;
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	__le64 **list = iod_list(req);
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	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;
	}
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	if (iod->sg != iod->inline_sg)
		kfree(iod->sg);
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}

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#ifdef CONFIG_BLK_DEV_INTEGRITY
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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);
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	ts = ns->disk->queue->integrity.tuple_size;
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	for (i = 0; i < nlb; i++, virt++, phys++) {
		pi = (struct t10_pi_tuple *)p;
		dif_swap(phys, virt, pi);
		p += ts;
	}
	kunmap_atomic(pmap);
}
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#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)
{
}
#endif

542
static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req)
M
Matthew Wilcox 已提交
543
{
C
Christoph Hellwig 已提交
544
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
545
	struct dma_pool *pool;
546
	int length = blk_rq_payload_bytes(req);
547
	struct scatterlist *sg = iod->sg;
M
Matthew Wilcox 已提交
548 549
	int dma_len = sg_dma_len(sg);
	u64 dma_addr = sg_dma_address(sg);
550
	u32 page_size = dev->ctrl.page_size;
551
	int offset = dma_addr & (page_size - 1);
552
	__le64 *prp_list;
C
Christoph Hellwig 已提交
553
	__le64 **list = iod_list(req);
554
	dma_addr_t prp_dma;
555
	int nprps, i;
M
Matthew Wilcox 已提交
556

557
	length -= (page_size - offset);
M
Matthew Wilcox 已提交
558
	if (length <= 0)
559
		return BLK_STS_OK;
M
Matthew Wilcox 已提交
560

561
	dma_len -= (page_size - offset);
M
Matthew Wilcox 已提交
562
	if (dma_len) {
563
		dma_addr += (page_size - offset);
M
Matthew Wilcox 已提交
564 565 566 567 568 569
	} else {
		sg = sg_next(sg);
		dma_addr = sg_dma_address(sg);
		dma_len = sg_dma_len(sg);
	}

570
	if (length <= page_size) {
571
		iod->first_dma = dma_addr;
572
		return BLK_STS_OK;
573 574
	}

575
	nprps = DIV_ROUND_UP(length, page_size);
576 577
	if (nprps <= (256 / 8)) {
		pool = dev->prp_small_pool;
578
		iod->npages = 0;
579 580
	} else {
		pool = dev->prp_page_pool;
581
		iod->npages = 1;
582 583
	}

584
	prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
585
	if (!prp_list) {
586
		iod->first_dma = dma_addr;
587
		iod->npages = -1;
588
		return BLK_STS_RESOURCE;
589
	}
590 591
	list[0] = prp_list;
	iod->first_dma = prp_dma;
592 593
	i = 0;
	for (;;) {
594
		if (i == page_size >> 3) {
595
			__le64 *old_prp_list = prp_list;
596
			prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
597
			if (!prp_list)
598
				return BLK_STS_RESOURCE;
599
			list[iod->npages++] = prp_list;
600 601 602
			prp_list[0] = old_prp_list[i - 1];
			old_prp_list[i - 1] = cpu_to_le64(prp_dma);
			i = 1;
603 604
		}
		prp_list[i++] = cpu_to_le64(dma_addr);
605 606 607
		dma_len -= page_size;
		dma_addr += page_size;
		length -= page_size;
608 609 610 611
		if (length <= 0)
			break;
		if (dma_len > 0)
			continue;
612 613
		if (unlikely(dma_len < 0))
			goto bad_sgl;
614 615 616
		sg = sg_next(sg);
		dma_addr = sg_dma_address(sg);
		dma_len = sg_dma_len(sg);
M
Matthew Wilcox 已提交
617 618
	}

619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634
	return BLK_STS_OK;

 bad_sgl:
	if (WARN_ONCE(1, "Invalid SGL for payload:%d nents:%d\n",
				blk_rq_payload_bytes(req), iod->nents)) {
		for_each_sg(iod->sg, sg, iod->nents, i) {
			dma_addr_t phys = sg_phys(sg);
			pr_warn("sg[%d] phys_addr:%pad offset:%d length:%d "
			       "dma_address:%pad dma_length:%d\n", i, &phys,
					sg->offset, sg->length,
					&sg_dma_address(sg),
					sg_dma_len(sg));
		}
	}
	return BLK_STS_IOERR;

M
Matthew Wilcox 已提交
635 636
}

637
static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,
638
		struct nvme_command *cmnd)
639
{
C
Christoph Hellwig 已提交
640
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
C
Christoph Hellwig 已提交
641 642 643
	struct request_queue *q = req->q;
	enum dma_data_direction dma_dir = rq_data_dir(req) ?
			DMA_TO_DEVICE : DMA_FROM_DEVICE;
644
	blk_status_t ret = BLK_STS_IOERR;
645

646
	sg_init_table(iod->sg, blk_rq_nr_phys_segments(req));
C
Christoph Hellwig 已提交
647 648 649
	iod->nents = blk_rq_map_sg(q, req, iod->sg);
	if (!iod->nents)
		goto out;
650

651
	ret = BLK_STS_RESOURCE;
652 653
	if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir,
				DMA_ATTR_NO_WARN))
C
Christoph Hellwig 已提交
654
		goto out;
655

656 657
	ret = nvme_setup_prps(dev, req);
	if (ret != BLK_STS_OK)
C
Christoph Hellwig 已提交
658
		goto out_unmap;
659

660
	ret = BLK_STS_IOERR;
C
Christoph Hellwig 已提交
661 662 663
	if (blk_integrity_rq(req)) {
		if (blk_rq_count_integrity_sg(q, req->bio) != 1)
			goto out_unmap;
664

665 666
		sg_init_table(&iod->meta_sg, 1);
		if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1)
C
Christoph Hellwig 已提交
667
			goto out_unmap;
668

C
Christoph Hellwig 已提交
669 670
		if (rq_data_dir(req))
			nvme_dif_remap(req, nvme_dif_prep);
671

672
		if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir))
C
Christoph Hellwig 已提交
673
			goto out_unmap;
674
	}
M
Matthew Wilcox 已提交
675

676 677
	cmnd->rw.dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
	cmnd->rw.dptr.prp2 = cpu_to_le64(iod->first_dma);
C
Christoph Hellwig 已提交
678
	if (blk_integrity_rq(req))
679
		cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg));
680
	return BLK_STS_OK;
M
Matthew Wilcox 已提交
681

C
Christoph Hellwig 已提交
682 683 684 685
out_unmap:
	dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
out:
	return ret;
M
Matthew Wilcox 已提交
686 687
}

C
Christoph Hellwig 已提交
688
static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
M
Matthew Wilcox 已提交
689
{
C
Christoph Hellwig 已提交
690
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
691 692 693 694 695 696 697 698
	enum dma_data_direction dma_dir = rq_data_dir(req) ?
			DMA_TO_DEVICE : DMA_FROM_DEVICE;

	if (iod->nents) {
		dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
		if (blk_integrity_rq(req)) {
			if (!rq_data_dir(req))
				nvme_dif_remap(req, nvme_dif_complete);
699
			dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir);
K
Keith Busch 已提交
700
		}
701
	}
K
Keith Busch 已提交
702

703
	nvme_cleanup_cmd(req);
C
Christoph Hellwig 已提交
704
	nvme_free_iod(dev, req);
705
}
M
Matthew Wilcox 已提交
706

707 708 709
/*
 * NOTE: ns is NULL when called on the admin queue.
 */
710
static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
M
Matias Bjørling 已提交
711
			 const struct blk_mq_queue_data *bd)
712
{
M
Matias Bjørling 已提交
713 714
	struct nvme_ns *ns = hctx->queue->queuedata;
	struct nvme_queue *nvmeq = hctx->driver_data;
715
	struct nvme_dev *dev = nvmeq->dev;
M
Matias Bjørling 已提交
716
	struct request *req = bd->rq;
C
Christoph Hellwig 已提交
717
	struct nvme_command cmnd;
718
	blk_status_t ret;
K
Keith Busch 已提交
719

720
	ret = nvme_setup_cmd(ns, req, &cmnd);
721
	if (ret)
C
Christoph Hellwig 已提交
722
		return ret;
M
Matias Bjørling 已提交
723

724
	ret = nvme_init_iod(req, dev);
725
	if (ret)
726
		goto out_free_cmd;
M
Matias Bjørling 已提交
727

728
	if (blk_rq_nr_phys_segments(req)) {
729
		ret = nvme_map_data(dev, req, &cmnd);
730 731 732
		if (ret)
			goto out_cleanup_iod;
	}
M
Matias Bjørling 已提交
733

734
	blk_mq_start_request(req);
M
Matias Bjørling 已提交
735

C
Christoph Hellwig 已提交
736
	spin_lock_irq(&nvmeq->q_lock);
737
	if (unlikely(nvmeq->cq_vector < 0)) {
738
		ret = BLK_STS_IOERR;
739
		spin_unlock_irq(&nvmeq->q_lock);
740
		goto out_cleanup_iod;
741
	}
C
Christoph Hellwig 已提交
742
	__nvme_submit_cmd(nvmeq, &cmnd);
M
Matias Bjørling 已提交
743 744
	nvme_process_cq(nvmeq);
	spin_unlock_irq(&nvmeq->q_lock);
745
	return BLK_STS_OK;
746
out_cleanup_iod:
C
Christoph Hellwig 已提交
747
	nvme_free_iod(dev, req);
748 749
out_free_cmd:
	nvme_cleanup_cmd(req);
C
Christoph Hellwig 已提交
750
	return ret;
M
Matthew Wilcox 已提交
751
}
K
Keith Busch 已提交
752

753
static void nvme_pci_complete_rq(struct request *req)
754
{
C
Christoph Hellwig 已提交
755
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
M
Matias Bjørling 已提交
756

757 758
	nvme_unmap_data(iod->nvmeq->dev, req);
	nvme_complete_rq(req);
M
Matthew Wilcox 已提交
759 760
}

761 762 763 764 765 766 767
/* We read the CQE phase first to check if the rest of the entry is valid */
static inline bool nvme_cqe_valid(struct nvme_queue *nvmeq, u16 head,
		u16 phase)
{
	return (le16_to_cpu(nvmeq->cqes[head].status) & 1) == phase;
}

768
static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq)
M
Matthew Wilcox 已提交
769
{
770
	u16 head = nvmeq->cq_head;
771

772 773 774 775 776 777
	if (likely(nvmeq->cq_vector >= 0)) {
		if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
						      nvmeq->dbbuf_cq_ei))
			writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
	}
}
778

779 780 781 782
static inline void nvme_handle_cqe(struct nvme_queue *nvmeq,
		struct nvme_completion *cqe)
{
	struct request *req;
783

784 785 786 787 788
	if (unlikely(cqe->command_id >= nvmeq->q_depth)) {
		dev_warn(nvmeq->dev->ctrl.device,
			"invalid id %d completed on queue %d\n",
			cqe->command_id, le16_to_cpu(cqe->sq_id));
		return;
M
Matthew Wilcox 已提交
789 790
	}

791 792 793 794 795 796 797 798 799 800
	/*
	 * AEN requests are special as they don't time out and can
	 * survive any kind of queue freeze and often don't respond to
	 * aborts.  We don't even bother to allocate a struct request
	 * for them but rather special case them here.
	 */
	if (unlikely(nvmeq->qid == 0 &&
			cqe->command_id >= NVME_AQ_BLKMQ_DEPTH)) {
		nvme_complete_async_event(&nvmeq->dev->ctrl,
				cqe->status, &cqe->result);
J
Jens Axboe 已提交
801
		return;
802
	}
M
Matthew Wilcox 已提交
803

804
	nvmeq->cqe_seen = 1;
805 806 807
	req = blk_mq_tag_to_rq(*nvmeq->tags, cqe->command_id);
	nvme_end_request(req, cqe->status, cqe->result);
}
M
Matthew Wilcox 已提交
808

809 810
static inline bool nvme_read_cqe(struct nvme_queue *nvmeq,
		struct nvme_completion *cqe)
M
Matthew Wilcox 已提交
811
{
812 813
	if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) {
		*cqe = nvmeq->cqes[nvmeq->cq_head];
814

815 816 817
		if (++nvmeq->cq_head == nvmeq->q_depth) {
			nvmeq->cq_head = 0;
			nvmeq->cq_phase = !nvmeq->cq_phase;
M
Matthew Wilcox 已提交
818
		}
819
		return true;
M
Matthew Wilcox 已提交
820
	}
821
	return false;
J
Jens Axboe 已提交
822 823 824 825
}

static void nvme_process_cq(struct nvme_queue *nvmeq)
{
826 827
	struct nvme_completion cqe;
	int consumed = 0;
M
Matthew Wilcox 已提交
828

829 830 831 832
	while (nvme_read_cqe(nvmeq, &cqe)) {
		nvme_handle_cqe(nvmeq, &cqe);
		consumed++;
	}
833

834
	if (consumed)
835
		nvme_ring_cq_doorbell(nvmeq);
M
Matthew Wilcox 已提交
836 837 838
}

static irqreturn_t nvme_irq(int irq, void *data)
839 840 841 842
{
	irqreturn_t result;
	struct nvme_queue *nvmeq = data;
	spin_lock(&nvmeq->q_lock);
843 844 845
	nvme_process_cq(nvmeq);
	result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE;
	nvmeq->cqe_seen = 0;
846 847 848 849 850 851 852
	spin_unlock(&nvmeq->q_lock);
	return result;
}

static irqreturn_t nvme_irq_check(int irq, void *data)
{
	struct nvme_queue *nvmeq = data;
853 854 855
	if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase))
		return IRQ_WAKE_THREAD;
	return IRQ_NONE;
856 857
}

K
Keith Busch 已提交
858
static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag)
J
Jens Axboe 已提交
859
{
860 861
	struct nvme_completion cqe;
	int found = 0, consumed = 0;
J
Jens Axboe 已提交
862

863 864
	if (!nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase))
		return 0;
J
Jens Axboe 已提交
865

866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881
	spin_lock_irq(&nvmeq->q_lock);
	while (nvme_read_cqe(nvmeq, &cqe)) {
		nvme_handle_cqe(nvmeq, &cqe);
		consumed++;

		if (tag == cqe.command_id) {
			found = 1;
			break;
		}
       }

	if (consumed)
		nvme_ring_cq_doorbell(nvmeq);
	spin_unlock_irq(&nvmeq->q_lock);

	return found;
J
Jens Axboe 已提交
882 883
}

K
Keith Busch 已提交
884 885 886 887 888 889 890
static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
{
	struct nvme_queue *nvmeq = hctx->driver_data;

	return __nvme_poll(nvmeq, tag);
}

891
static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx)
M
Matthew Wilcox 已提交
892
{
893
	struct nvme_dev *dev = to_nvme_dev(ctrl);
894
	struct nvme_queue *nvmeq = dev->queues[0];
M
Matias Bjørling 已提交
895
	struct nvme_command c;
M
Matthew Wilcox 已提交
896

M
Matias Bjørling 已提交
897 898
	memset(&c, 0, sizeof(c));
	c.common.opcode = nvme_admin_async_event;
899
	c.common.command_id = NVME_AQ_BLKMQ_DEPTH + aer_idx;
900

901
	spin_lock_irq(&nvmeq->q_lock);
902
	__nvme_submit_cmd(nvmeq, &c);
903
	spin_unlock_irq(&nvmeq->q_lock);
904 905
}

M
Matthew Wilcox 已提交
906
static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
907
{
M
Matthew Wilcox 已提交
908 909 910 911 912 913
	struct nvme_command c;

	memset(&c, 0, sizeof(c));
	c.delete_queue.opcode = opcode;
	c.delete_queue.qid = cpu_to_le16(id);

914
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
915 916 917 918 919 920 921 922
}

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;

923 924 925 926
	/*
	 * Note: we (ab)use the fact the the prp fields survive if no data
	 * is attached to the request.
	 */
M
Matthew Wilcox 已提交
927 928 929 930 931 932 933 934
	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);

935
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
936 937 938 939 940 941
}

static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
						struct nvme_queue *nvmeq)
{
	struct nvme_command c;
942
	int flags = NVME_QUEUE_PHYS_CONTIG;
M
Matthew Wilcox 已提交
943

944 945 946 947
	/*
	 * Note: we (ab)use the fact the the prp fields survive if no data
	 * is attached to the request.
	 */
M
Matthew Wilcox 已提交
948 949 950 951 952 953 954 955
	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);

956
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
957 958 959 960 961 962 963 964 965 966 967 968
}

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);
}

969
static void abort_endio(struct request *req, blk_status_t error)
970
{
C
Christoph Hellwig 已提交
971 972
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	struct nvme_queue *nvmeq = iod->nvmeq;
973

974 975
	dev_warn(nvmeq->dev->ctrl.device,
		 "Abort status: 0x%x", nvme_req(req)->status);
976 977
	atomic_inc(&nvmeq->dev->ctrl.abort_limit);
	blk_mq_free_request(req);
978 979
}

K
Keith Busch 已提交
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
static bool nvme_should_reset(struct nvme_dev *dev, u32 csts)
{

	/* If true, indicates loss of adapter communication, possibly by a
	 * NVMe Subsystem reset.
	 */
	bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO);

	/* If there is a reset ongoing, we shouldn't reset again. */
	if (dev->ctrl.state == NVME_CTRL_RESETTING)
		return false;

	/* We shouldn't reset unless the controller is on fatal error state
	 * _or_ if we lost the communication with it.
	 */
	if (!(csts & NVME_CSTS_CFS) && !nssro)
		return false;

	/* If PCI error recovery process is happening, we cannot reset or
	 * the recovery mechanism will surely fail.
	 */
	if (pci_channel_offline(to_pci_dev(dev->dev)))
		return false;

	return true;
}

static void nvme_warn_reset(struct nvme_dev *dev, u32 csts)
{
	/* Read a config register to help see what died. */
	u16 pci_status;
	int result;

	result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS,
				      &pci_status);
	if (result == PCIBIOS_SUCCESSFUL)
		dev_warn(dev->ctrl.device,
			 "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n",
			 csts, pci_status);
	else
		dev_warn(dev->ctrl.device,
			 "controller is down; will reset: CSTS=0x%x, PCI_STATUS read failed (%d)\n",
			 csts, result);
}

1025
static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
K
Keith Busch 已提交
1026
{
C
Christoph Hellwig 已提交
1027 1028
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	struct nvme_queue *nvmeq = iod->nvmeq;
K
Keith Busch 已提交
1029
	struct nvme_dev *dev = nvmeq->dev;
M
Matias Bjørling 已提交
1030 1031
	struct request *abort_req;
	struct nvme_command cmd;
K
Keith Busch 已提交
1032 1033 1034 1035 1036 1037 1038 1039
	u32 csts = readl(dev->bar + NVME_REG_CSTS);

	/*
	 * Reset immediately if the controller is failed
	 */
	if (nvme_should_reset(dev, csts)) {
		nvme_warn_reset(dev, csts);
		nvme_dev_disable(dev, false);
1040
		nvme_reset_ctrl(&dev->ctrl);
K
Keith Busch 已提交
1041 1042
		return BLK_EH_HANDLED;
	}
K
Keith Busch 已提交
1043

K
Keith Busch 已提交
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	/*
	 * Did we miss an interrupt?
	 */
	if (__nvme_poll(nvmeq, req->tag)) {
		dev_warn(dev->ctrl.device,
			 "I/O %d QID %d timeout, completion polled\n",
			 req->tag, nvmeq->qid);
		return BLK_EH_HANDLED;
	}

1054
	/*
1055 1056 1057 1058 1059
	 * Shutdown immediately if controller times out while starting. The
	 * reset work will see the pci device disabled when it gets the forced
	 * cancellation error. All outstanding requests are completed on
	 * shutdown, so we return BLK_EH_HANDLED.
	 */
1060
	if (dev->ctrl.state == NVME_CTRL_RESETTING) {
1061
		dev_warn(dev->ctrl.device,
1062 1063
			 "I/O %d QID %d timeout, disable controller\n",
			 req->tag, nvmeq->qid);
1064
		nvme_dev_disable(dev, false);
1065
		nvme_req(req)->flags |= NVME_REQ_CANCELLED;
1066
		return BLK_EH_HANDLED;
K
Keith Busch 已提交
1067 1068
	}

1069 1070 1071 1072
	/*
 	 * Shutdown the controller immediately and schedule a 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.
1073
	 */
C
Christoph Hellwig 已提交
1074
	if (!nvmeq->qid || iod->aborted) {
1075
		dev_warn(dev->ctrl.device,
1076 1077
			 "I/O %d QID %d timeout, reset controller\n",
			 req->tag, nvmeq->qid);
1078
		nvme_dev_disable(dev, false);
1079
		nvme_reset_ctrl(&dev->ctrl);
K
Keith Busch 已提交
1080

1081 1082 1083 1084
		/*
		 * Mark the request as handled, since the inline shutdown
		 * forces all outstanding requests to complete.
		 */
1085
		nvme_req(req)->flags |= NVME_REQ_CANCELLED;
1086
		return BLK_EH_HANDLED;
K
Keith Busch 已提交
1087 1088
	}

1089
	if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) {
1090
		atomic_inc(&dev->ctrl.abort_limit);
1091
		return BLK_EH_RESET_TIMER;
1092
	}
1093
	iod->aborted = 1;
M
Matias Bjørling 已提交
1094

K
Keith Busch 已提交
1095 1096
	memset(&cmd, 0, sizeof(cmd));
	cmd.abort.opcode = nvme_admin_abort_cmd;
M
Matias Bjørling 已提交
1097
	cmd.abort.cid = req->tag;
K
Keith Busch 已提交
1098 1099
	cmd.abort.sqid = cpu_to_le16(nvmeq->qid);

1100 1101 1102
	dev_warn(nvmeq->dev->ctrl.device,
		"I/O %d QID %d timeout, aborting\n",
		 req->tag, nvmeq->qid);
1103 1104

	abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd,
1105
			BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
1106 1107 1108 1109 1110 1111 1112 1113
	if (IS_ERR(abort_req)) {
		atomic_inc(&dev->ctrl.abort_limit);
		return BLK_EH_RESET_TIMER;
	}

	abort_req->timeout = ADMIN_TIMEOUT;
	abort_req->end_io_data = NULL;
	blk_execute_rq_nowait(abort_req->q, NULL, abort_req, 0, abort_endio);
K
Keith Busch 已提交
1114

1115 1116 1117 1118 1119 1120
	/*
	 * 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;
K
Keith Busch 已提交
1121 1122
}

M
Matias Bjørling 已提交
1123 1124
static void nvme_free_queue(struct nvme_queue *nvmeq)
{
1125 1126
	dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
				(void *)nvmeq->cqes, nvmeq->cq_dma_addr);
1127 1128
	if (nvmeq->sq_cmds)
		dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
1129 1130 1131 1132
					nvmeq->sq_cmds, nvmeq->sq_dma_addr);
	kfree(nvmeq);
}

1133
static void nvme_free_queues(struct nvme_dev *dev, int lowest)
1134 1135 1136
{
	int i;

1137
	for (i = dev->ctrl.queue_count - 1; i >= lowest; i--) {
M
Matias Bjørling 已提交
1138
		struct nvme_queue *nvmeq = dev->queues[i];
1139
		dev->ctrl.queue_count--;
M
Matias Bjørling 已提交
1140
		dev->queues[i] = NULL;
K
Keith Busch 已提交
1141
		nvme_free_queue(nvmeq);
1142
	}
1143 1144
}

K
Keith Busch 已提交
1145 1146 1147 1148 1149
/**
 * nvme_suspend_queue - put queue into suspended state
 * @nvmeq - queue to suspend
 */
static int nvme_suspend_queue(struct nvme_queue *nvmeq)
M
Matthew Wilcox 已提交
1150
{
K
Keith Busch 已提交
1151
	int vector;
M
Matthew Wilcox 已提交
1152

1153
	spin_lock_irq(&nvmeq->q_lock);
K
Keith Busch 已提交
1154 1155 1156 1157
	if (nvmeq->cq_vector == -1) {
		spin_unlock_irq(&nvmeq->q_lock);
		return 1;
	}
1158
	vector = nvmeq->cq_vector;
K
Keith Busch 已提交
1159
	nvmeq->dev->online_queues--;
K
Keith Busch 已提交
1160
	nvmeq->cq_vector = -1;
1161 1162
	spin_unlock_irq(&nvmeq->q_lock);

1163
	if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q)
1164
		blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q);
1165

1166
	pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq);
M
Matthew Wilcox 已提交
1167

K
Keith Busch 已提交
1168 1169
	return 0;
}
M
Matthew Wilcox 已提交
1170

1171
static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
K
Keith Busch 已提交
1172
{
1173
	struct nvme_queue *nvmeq = dev->queues[0];
K
Keith Busch 已提交
1174 1175 1176 1177 1178 1179

	if (!nvmeq)
		return;
	if (nvme_suspend_queue(nvmeq))
		return;

1180 1181 1182
	if (shutdown)
		nvme_shutdown_ctrl(&dev->ctrl);
	else
1183
		nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap);
1184 1185 1186 1187

	spin_lock_irq(&nvmeq->q_lock);
	nvme_process_cq(nvmeq);
	spin_unlock_irq(&nvmeq->q_lock);
M
Matthew Wilcox 已提交
1188 1189
}

1190 1191 1192 1193
static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
				int entry_size)
{
	int q_depth = dev->q_depth;
1194 1195
	unsigned q_size_aligned = roundup(q_depth * entry_size,
					  dev->ctrl.page_size);
1196 1197

	if (q_size_aligned * nr_io_queues > dev->cmb_size) {
1198
		u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues);
1199
		mem_per_q = round_down(mem_per_q, dev->ctrl.page_size);
1200
		q_depth = div_u64(mem_per_q, entry_size);
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217

		/*
		 * 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)) {
1218 1219
		unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth),
						      dev->ctrl.page_size);
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
		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;
}

M
Matthew Wilcox 已提交
1232
static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
1233
							int depth, int node)
M
Matthew Wilcox 已提交
1234
{
1235 1236
	struct nvme_queue *nvmeq = kzalloc_node(sizeof(*nvmeq), GFP_KERNEL,
							node);
M
Matthew Wilcox 已提交
1237 1238 1239
	if (!nvmeq)
		return NULL;

1240
	nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth),
J
Joe Perches 已提交
1241
					  &nvmeq->cq_dma_addr, GFP_KERNEL);
M
Matthew Wilcox 已提交
1242 1243 1244
	if (!nvmeq->cqes)
		goto free_nvmeq;

1245
	if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth))
M
Matthew Wilcox 已提交
1246 1247
		goto free_cqdma;

1248
	nvmeq->q_dmadev = dev->dev;
M
Matthew Wilcox 已提交
1249
	nvmeq->dev = dev;
M
Matthew Wilcox 已提交
1250 1251
	spin_lock_init(&nvmeq->q_lock);
	nvmeq->cq_head = 0;
M
Matthew Wilcox 已提交
1252
	nvmeq->cq_phase = 1;
1253
	nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
M
Matthew Wilcox 已提交
1254
	nvmeq->q_depth = depth;
K
Keith Busch 已提交
1255
	nvmeq->qid = qid;
1256
	nvmeq->cq_vector = -1;
M
Matias Bjørling 已提交
1257
	dev->queues[qid] = nvmeq;
1258
	dev->ctrl.queue_count++;
1259

M
Matthew Wilcox 已提交
1260 1261 1262
	return nvmeq;

 free_cqdma:
1263
	dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes,
M
Matthew Wilcox 已提交
1264 1265 1266 1267 1268 1269
							nvmeq->cq_dma_addr);
 free_nvmeq:
	kfree(nvmeq);
	return NULL;
}

1270
static int queue_request_irq(struct nvme_queue *nvmeq)
1271
{
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
	struct pci_dev *pdev = to_pci_dev(nvmeq->dev->dev);
	int nr = nvmeq->dev->ctrl.instance;

	if (use_threaded_interrupts) {
		return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq_check,
				nvme_irq, nvmeq, "nvme%dq%d", nr, nvmeq->qid);
	} else {
		return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq,
				NULL, nvmeq, "nvme%dq%d", nr, nvmeq->qid);
	}
1282 1283
}

1284
static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
M
Matthew Wilcox 已提交
1285
{
1286
	struct nvme_dev *dev = nvmeq->dev;
M
Matthew Wilcox 已提交
1287

1288
	spin_lock_irq(&nvmeq->q_lock);
1289 1290 1291
	nvmeq->sq_tail = 0;
	nvmeq->cq_head = 0;
	nvmeq->cq_phase = 1;
1292
	nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
1293
	memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
1294
	nvme_dbbuf_init(dev, nvmeq, qid);
K
Keith Busch 已提交
1295
	dev->online_queues++;
1296
	spin_unlock_irq(&nvmeq->q_lock);
1297 1298 1299 1300 1301 1302
}

static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
{
	struct nvme_dev *dev = nvmeq->dev;
	int result;
1303

K
Keith Busch 已提交
1304
	nvmeq->cq_vector = qid - 1;
M
Matthew Wilcox 已提交
1305 1306
	result = adapter_alloc_cq(dev, qid, nvmeq);
	if (result < 0)
1307
		return result;
M
Matthew Wilcox 已提交
1308 1309 1310 1311 1312

	result = adapter_alloc_sq(dev, qid, nvmeq);
	if (result < 0)
		goto release_cq;

1313
	result = queue_request_irq(nvmeq);
M
Matthew Wilcox 已提交
1314 1315 1316
	if (result < 0)
		goto release_sq;

1317 1318
	nvme_init_queue(nvmeq, qid);
	return result;
M
Matthew Wilcox 已提交
1319 1320 1321 1322 1323

 release_sq:
	adapter_delete_sq(dev, qid);
 release_cq:
	adapter_delete_cq(dev, qid);
1324
	return result;
M
Matthew Wilcox 已提交
1325 1326
}

1327
static const struct blk_mq_ops nvme_mq_admin_ops = {
1328
	.queue_rq	= nvme_queue_rq,
1329
	.complete	= nvme_pci_complete_rq,
M
Matias Bjørling 已提交
1330
	.init_hctx	= nvme_admin_init_hctx,
1331
	.exit_hctx      = nvme_admin_exit_hctx,
1332
	.init_request	= nvme_init_request,
M
Matias Bjørling 已提交
1333 1334 1335
	.timeout	= nvme_timeout,
};

1336
static const struct blk_mq_ops nvme_mq_ops = {
M
Matias Bjørling 已提交
1337
	.queue_rq	= nvme_queue_rq,
1338
	.complete	= nvme_pci_complete_rq,
M
Matias Bjørling 已提交
1339 1340
	.init_hctx	= nvme_init_hctx,
	.init_request	= nvme_init_request,
1341
	.map_queues	= nvme_pci_map_queues,
M
Matias Bjørling 已提交
1342
	.timeout	= nvme_timeout,
J
Jens Axboe 已提交
1343
	.poll		= nvme_poll,
M
Matias Bjørling 已提交
1344 1345
};

1346 1347
static void nvme_dev_remove_admin(struct nvme_dev *dev)
{
1348
	if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) {
1349 1350 1351 1352 1353
		/*
		 * If the controller was reset during removal, it's possible
		 * user requests may be waiting on a stopped queue. Start the
		 * queue to flush these to completion.
		 */
1354
		blk_mq_unquiesce_queue(dev->ctrl.admin_q);
1355
		blk_cleanup_queue(dev->ctrl.admin_q);
1356 1357 1358 1359
		blk_mq_free_tag_set(&dev->admin_tagset);
	}
}

M
Matias Bjørling 已提交
1360 1361
static int nvme_alloc_admin_tags(struct nvme_dev *dev)
{
1362
	if (!dev->ctrl.admin_q) {
M
Matias Bjørling 已提交
1363 1364
		dev->admin_tagset.ops = &nvme_mq_admin_ops;
		dev->admin_tagset.nr_hw_queues = 1;
K
Keith Busch 已提交
1365 1366 1367 1368 1369 1370

		/*
		 * Subtract one to leave an empty queue entry for 'Full Queue'
		 * condition. See NVM-Express 1.2 specification, section 4.1.2.
		 */
		dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH - 1;
M
Matias Bjørling 已提交
1371
		dev->admin_tagset.timeout = ADMIN_TIMEOUT;
1372
		dev->admin_tagset.numa_node = dev_to_node(dev->dev);
1373
		dev->admin_tagset.cmd_size = nvme_cmd_size(dev);
1374
		dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED;
M
Matias Bjørling 已提交
1375 1376 1377 1378 1379
		dev->admin_tagset.driver_data = dev;

		if (blk_mq_alloc_tag_set(&dev->admin_tagset))
			return -ENOMEM;

1380 1381
		dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset);
		if (IS_ERR(dev->ctrl.admin_q)) {
M
Matias Bjørling 已提交
1382 1383 1384
			blk_mq_free_tag_set(&dev->admin_tagset);
			return -ENOMEM;
		}
1385
		if (!blk_get_queue(dev->ctrl.admin_q)) {
1386
			nvme_dev_remove_admin(dev);
1387
			dev->ctrl.admin_q = NULL;
1388 1389
			return -ENODEV;
		}
K
Keith Busch 已提交
1390
	} else
1391
		blk_mq_unquiesce_queue(dev->ctrl.admin_q);
M
Matias Bjørling 已提交
1392 1393 1394 1395

	return 0;
}

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
static unsigned long db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
{
	return NVME_REG_DBS + ((nr_io_queues + 1) * 8 * dev->db_stride);
}

static int nvme_remap_bar(struct nvme_dev *dev, unsigned long size)
{
	struct pci_dev *pdev = to_pci_dev(dev->dev);

	if (size <= dev->bar_mapped_size)
		return 0;
	if (size > pci_resource_len(pdev, 0))
		return -ENOMEM;
	if (dev->bar)
		iounmap(dev->bar);
	dev->bar = ioremap(pci_resource_start(pdev, 0), size);
	if (!dev->bar) {
		dev->bar_mapped_size = 0;
		return -ENOMEM;
	}
	dev->bar_mapped_size = size;
	dev->dbs = dev->bar + NVME_REG_DBS;

	return 0;
}

1422
static int nvme_pci_configure_admin_queue(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1423
{
1424
	int result;
M
Matthew Wilcox 已提交
1425 1426 1427
	u32 aqa;
	struct nvme_queue *nvmeq;

1428 1429 1430 1431
	result = nvme_remap_bar(dev, db_bar_size(dev, 0));
	if (result < 0)
		return result;

1432
	dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1, 0) ?
1433
				NVME_CAP_NSSRC(dev->ctrl.cap) : 0;
1434

1435 1436 1437
	if (dev->subsystem &&
	    (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO))
		writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS);
1438

1439
	result = nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap);
1440 1441
	if (result < 0)
		return result;
M
Matthew Wilcox 已提交
1442

M
Matias Bjørling 已提交
1443
	nvmeq = dev->queues[0];
1444
	if (!nvmeq) {
1445 1446
		nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH,
					dev_to_node(dev->dev));
1447 1448 1449
		if (!nvmeq)
			return -ENOMEM;
	}
M
Matthew Wilcox 已提交
1450 1451 1452 1453

	aqa = nvmeq->q_depth - 1;
	aqa |= aqa << 16;

1454 1455 1456
	writel(aqa, dev->bar + NVME_REG_AQA);
	lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ);
	lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ);
M
Matthew Wilcox 已提交
1457

1458
	result = nvme_enable_ctrl(&dev->ctrl, dev->ctrl.cap);
1459
	if (result)
K
Keith Busch 已提交
1460
		return result;
M
Matias Bjørling 已提交
1461

K
Keith Busch 已提交
1462
	nvmeq->cq_vector = 0;
1463
	result = queue_request_irq(nvmeq);
1464 1465
	if (result) {
		nvmeq->cq_vector = -1;
K
Keith Busch 已提交
1466
		return result;
1467
	}
1468

M
Matthew Wilcox 已提交
1469 1470 1471
	return result;
}

1472
static int nvme_create_io_queues(struct nvme_dev *dev)
K
Keith Busch 已提交
1473
{
1474
	unsigned i, max;
1475
	int ret = 0;
K
Keith Busch 已提交
1476

1477
	for (i = dev->ctrl.queue_count; i <= dev->max_qid; i++) {
1478 1479 1480
		/* vector == qid - 1, match nvme_create_queue */
		if (!nvme_alloc_queue(dev, i, dev->q_depth,
		     pci_irq_get_node(to_pci_dev(dev->dev), i - 1))) {
1481
			ret = -ENOMEM;
K
Keith Busch 已提交
1482
			break;
1483 1484
		}
	}
K
Keith Busch 已提交
1485

1486
	max = min(dev->max_qid, dev->ctrl.queue_count - 1);
1487
	for (i = dev->online_queues; i <= max; i++) {
1488
		ret = nvme_create_queue(dev->queues[i], i);
K
Keith Busch 已提交
1489
		if (ret)
K
Keith Busch 已提交
1490
			break;
M
Matthew Wilcox 已提交
1491
	}
1492 1493 1494 1495 1496 1497 1498 1499

	/*
	 * Ignore failing Create SQ/CQ commands, we can continue with less
	 * than the desired aount of queues, and even a controller without
	 * I/O queues an still be used to issue admin commands.  This might
	 * be useful to upgrade a buggy firmware for example.
	 */
	return ret >= 0 ? 0 : ret;
M
Matthew Wilcox 已提交
1500 1501
}

1502 1503 1504 1505 1506 1507
static ssize_t nvme_cmb_show(struct device *dev,
			     struct device_attribute *attr,
			     char *buf)
{
	struct nvme_dev *ndev = to_nvme_dev(dev_get_drvdata(dev));

1508
	return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz  : x%08x\n",
1509 1510 1511 1512
		       ndev->cmbloc, ndev->cmbsz);
}
static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL);

1513 1514 1515 1516 1517 1518 1519 1520
static void __iomem *nvme_map_cmb(struct nvme_dev *dev)
{
	u64 szu, size, offset;
	resource_size_t bar_size;
	struct pci_dev *pdev = to_pci_dev(dev->dev);
	void __iomem *cmb;
	dma_addr_t dma_addr;

1521
	dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ);
1522 1523
	if (!(NVME_CMB_SZ(dev->cmbsz)))
		return NULL;
1524
	dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC);
1525

1526 1527
	if (!use_cmb_sqes)
		return NULL;
1528 1529 1530

	szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz));
	size = szu * NVME_CMB_SZ(dev->cmbsz);
1531 1532
	offset = szu * NVME_CMB_OFST(dev->cmbloc);
	bar_size = pci_resource_len(pdev, NVME_CMB_BIR(dev->cmbloc));
1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544

	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;

1545
	dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(dev->cmbloc)) + offset;
1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559
	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;
1560 1561 1562
		sysfs_remove_file_from_group(&dev->ctrl.device->kobj,
					     &dev_attr_cmb.attr, NULL);
		dev->cmbsz = 0;
1563 1564 1565
	}
}

1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616
static int nvme_set_host_mem(struct nvme_dev *dev, u32 bits)
{
	size_t len = dev->nr_host_mem_descs * sizeof(*dev->host_mem_descs);
	struct nvme_command c;
	u64 dma_addr;
	int ret;

	dma_addr = dma_map_single(dev->dev, dev->host_mem_descs, len,
			DMA_TO_DEVICE);
	if (dma_mapping_error(dev->dev, dma_addr))
		return -ENOMEM;

	memset(&c, 0, sizeof(c));
	c.features.opcode	= nvme_admin_set_features;
	c.features.fid		= cpu_to_le32(NVME_FEAT_HOST_MEM_BUF);
	c.features.dword11	= cpu_to_le32(bits);
	c.features.dword12	= cpu_to_le32(dev->host_mem_size >>
					      ilog2(dev->ctrl.page_size));
	c.features.dword13	= cpu_to_le32(lower_32_bits(dma_addr));
	c.features.dword14	= cpu_to_le32(upper_32_bits(dma_addr));
	c.features.dword15	= cpu_to_le32(dev->nr_host_mem_descs);

	ret = nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
	if (ret) {
		dev_warn(dev->ctrl.device,
			 "failed to set host mem (err %d, flags %#x).\n",
			 ret, bits);
	}
	dma_unmap_single(dev->dev, dma_addr, len, DMA_TO_DEVICE);
	return ret;
}

static void nvme_free_host_mem(struct nvme_dev *dev)
{
	int i;

	for (i = 0; i < dev->nr_host_mem_descs; i++) {
		struct nvme_host_mem_buf_desc *desc = &dev->host_mem_descs[i];
		size_t size = le32_to_cpu(desc->size) * dev->ctrl.page_size;

		dma_free_coherent(dev->dev, size, dev->host_mem_desc_bufs[i],
				le64_to_cpu(desc->addr));
	}

	kfree(dev->host_mem_desc_bufs);
	dev->host_mem_desc_bufs = NULL;
	kfree(dev->host_mem_descs);
	dev->host_mem_descs = NULL;
}

static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred)
K
Keith Busch 已提交
1617
{
1618
	struct nvme_host_mem_buf_desc *descs;
1619
	u32 chunk_size, max_entries, len;
1620
	int i = 0;
1621
	void **bufs;
1622
	u64 size = 0, tmp;
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637

	/* start big and work our way down */
	chunk_size = min(preferred, (u64)PAGE_SIZE << MAX_ORDER);
retry:
	tmp = (preferred + chunk_size - 1);
	do_div(tmp, chunk_size);
	max_entries = tmp;
	descs = kcalloc(max_entries, sizeof(*descs), GFP_KERNEL);
	if (!descs)
		goto out;

	bufs = kcalloc(max_entries, sizeof(*bufs), GFP_KERNEL);
	if (!bufs)
		goto out_free_descs;

1638
	for (size = 0; size < preferred; size += len) {
1639 1640
		dma_addr_t dma_addr;

1641
		len = min_t(u64, chunk_size, preferred - size);
1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720
		bufs[i] = dma_alloc_attrs(dev->dev, len, &dma_addr, GFP_KERNEL,
				DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN);
		if (!bufs[i])
			break;

		descs[i].addr = cpu_to_le64(dma_addr);
		descs[i].size = cpu_to_le32(len / dev->ctrl.page_size);
		i++;
	}

	if (!size || (min && size < min)) {
		dev_warn(dev->ctrl.device,
			"failed to allocate host memory buffer.\n");
		goto out_free_bufs;
	}

	dev_info(dev->ctrl.device,
		"allocated %lld MiB host memory buffer.\n",
		size >> ilog2(SZ_1M));
	dev->nr_host_mem_descs = i;
	dev->host_mem_size = size;
	dev->host_mem_descs = descs;
	dev->host_mem_desc_bufs = bufs;
	return 0;

out_free_bufs:
	while (--i >= 0) {
		size_t size = le32_to_cpu(descs[i].size) * dev->ctrl.page_size;

		dma_free_coherent(dev->dev, size, bufs[i],
				le64_to_cpu(descs[i].addr));
	}

	kfree(bufs);
out_free_descs:
	kfree(descs);
out:
	/* try a smaller chunk size if we failed early */
	if (chunk_size >= PAGE_SIZE * 2 && (i == 0 || size < min)) {
		chunk_size /= 2;
		goto retry;
	}
	dev->host_mem_descs = NULL;
	return -ENOMEM;
}

static void nvme_setup_host_mem(struct nvme_dev *dev)
{
	u64 max = (u64)max_host_mem_size_mb * SZ_1M;
	u64 preferred = (u64)dev->ctrl.hmpre * 4096;
	u64 min = (u64)dev->ctrl.hmmin * 4096;
	u32 enable_bits = NVME_HOST_MEM_ENABLE;

	preferred = min(preferred, max);
	if (min > max) {
		dev_warn(dev->ctrl.device,
			"min host memory (%lld MiB) above limit (%d MiB).\n",
			min >> ilog2(SZ_1M), max_host_mem_size_mb);
		nvme_free_host_mem(dev);
		return;
	}

	/*
	 * If we already have a buffer allocated check if we can reuse it.
	 */
	if (dev->host_mem_descs) {
		if (dev->host_mem_size >= min)
			enable_bits |= NVME_HOST_MEM_RETURN;
		else
			nvme_free_host_mem(dev);
	}

	if (!dev->host_mem_descs) {
		if (nvme_alloc_host_mem(dev, min, preferred))
			return;
	}

	if (nvme_set_host_mem(dev, enable_bits))
		nvme_free_host_mem(dev);
K
Keith Busch 已提交
1721 1722
}

1723
static int nvme_setup_io_queues(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1724
{
M
Matias Bjørling 已提交
1725
	struct nvme_queue *adminq = dev->queues[0];
1726
	struct pci_dev *pdev = to_pci_dev(dev->dev);
1727 1728
	int result, nr_io_queues;
	unsigned long size;
M
Matthew Wilcox 已提交
1729

1730
	nr_io_queues = num_present_cpus();
C
Christoph Hellwig 已提交
1731 1732
	result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues);
	if (result < 0)
M
Matthew Wilcox 已提交
1733
		return result;
C
Christoph Hellwig 已提交
1734

1735
	if (nr_io_queues == 0)
1736
		return 0;
M
Matthew Wilcox 已提交
1737

1738 1739 1740 1741 1742 1743 1744 1745 1746
	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);
	}

1747 1748 1749 1750 1751 1752 1753 1754 1755
	do {
		size = db_bar_size(dev, nr_io_queues);
		result = nvme_remap_bar(dev, size);
		if (!result)
			break;
		if (!--nr_io_queues)
			return -ENOMEM;
	} while (1);
	adminq->q_db = dev->dbs;
1756

K
Keith Busch 已提交
1757
	/* Deregister the admin queue's interrupt */
1758
	pci_free_irq(pdev, 0, adminq);
K
Keith Busch 已提交
1759

1760 1761 1762 1763
	/*
	 * If we enable msix early due to not intx, disable it again before
	 * setting up the full range we need.
	 */
1764 1765 1766 1767 1768 1769
	pci_free_irq_vectors(pdev);
	nr_io_queues = pci_alloc_irq_vectors(pdev, 1, nr_io_queues,
			PCI_IRQ_ALL_TYPES | PCI_IRQ_AFFINITY);
	if (nr_io_queues <= 0)
		return -EIO;
	dev->max_qid = nr_io_queues;
R
Ramachandra Rao Gajula 已提交
1770

1771 1772 1773 1774 1775 1776 1777
	/*
	 * 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.
	 */

1778
	result = queue_request_irq(adminq);
1779 1780
	if (result) {
		adminq->cq_vector = -1;
K
Keith Busch 已提交
1781
		return result;
1782
	}
1783
	return nvme_create_io_queues(dev);
M
Matthew Wilcox 已提交
1784 1785
}

1786
static void nvme_del_queue_end(struct request *req, blk_status_t error)
K
Keith Busch 已提交
1787
{
K
Keith Busch 已提交
1788
	struct nvme_queue *nvmeq = req->end_io_data;
1789

K
Keith Busch 已提交
1790 1791
	blk_mq_free_request(req);
	complete(&nvmeq->dev->ioq_wait);
K
Keith Busch 已提交
1792 1793
}

1794
static void nvme_del_cq_end(struct request *req, blk_status_t error)
K
Keith Busch 已提交
1795
{
K
Keith Busch 已提交
1796
	struct nvme_queue *nvmeq = req->end_io_data;
K
Keith Busch 已提交
1797

K
Keith Busch 已提交
1798 1799 1800
	if (!error) {
		unsigned long flags;

1801 1802 1803 1804 1805 1806 1807
		/*
		 * We might be called with the AQ q_lock held
		 * and the I/O queue q_lock should always
		 * nest inside the AQ one.
		 */
		spin_lock_irqsave_nested(&nvmeq->q_lock, flags,
					SINGLE_DEPTH_NESTING);
K
Keith Busch 已提交
1808 1809
		nvme_process_cq(nvmeq);
		spin_unlock_irqrestore(&nvmeq->q_lock, flags);
K
Keith Busch 已提交
1810
	}
K
Keith Busch 已提交
1811 1812

	nvme_del_queue_end(req, error);
K
Keith Busch 已提交
1813 1814
}

K
Keith Busch 已提交
1815
static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode)
1816
{
K
Keith Busch 已提交
1817 1818 1819
	struct request_queue *q = nvmeq->dev->ctrl.admin_q;
	struct request *req;
	struct nvme_command cmd;
1820

K
Keith Busch 已提交
1821 1822 1823
	memset(&cmd, 0, sizeof(cmd));
	cmd.delete_queue.opcode = opcode;
	cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid);
1824

1825
	req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
K
Keith Busch 已提交
1826 1827
	if (IS_ERR(req))
		return PTR_ERR(req);
1828

K
Keith Busch 已提交
1829 1830 1831 1832 1833 1834 1835
	req->timeout = ADMIN_TIMEOUT;
	req->end_io_data = nvmeq;

	blk_execute_rq_nowait(q, NULL, req, false,
			opcode == nvme_admin_delete_cq ?
				nvme_del_cq_end : nvme_del_queue_end);
	return 0;
1836 1837
}

1838
static void nvme_disable_io_queues(struct nvme_dev *dev, int queues)
K
Keith Busch 已提交
1839
{
1840
	int pass;
K
Keith Busch 已提交
1841 1842
	unsigned long timeout;
	u8 opcode = nvme_admin_delete_sq;
K
Keith Busch 已提交
1843

K
Keith Busch 已提交
1844
	for (pass = 0; pass < 2; pass++) {
K
Keith Busch 已提交
1845
		int sent = 0, i = queues;
K
Keith Busch 已提交
1846 1847 1848 1849

		reinit_completion(&dev->ioq_wait);
 retry:
		timeout = ADMIN_TIMEOUT;
1850 1851
		for (; i > 0; i--, sent++)
			if (nvme_delete_queue(dev->queues[i], opcode))
K
Keith Busch 已提交
1852
				break;
1853

K
Keith Busch 已提交
1854 1855 1856 1857 1858 1859 1860 1861 1862
		while (sent--) {
			timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout);
			if (timeout == 0)
				return;
			if (i)
				goto retry;
		}
		opcode = nvme_admin_delete_cq;
	}
K
Keith Busch 已提交
1863 1864
}

1865 1866 1867 1868 1869 1870
/*
 * 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.
 */
1871
static int nvme_dev_add(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1872
{
1873
	if (!dev->ctrl.tagset) {
1874 1875 1876 1877 1878
		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 =
M
Matias Bjørling 已提交
1879
				min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1;
1880 1881 1882
		dev->tagset.cmd_size = nvme_cmd_size(dev);
		dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE;
		dev->tagset.driver_data = dev;
M
Matthew Wilcox 已提交
1883

1884 1885
		if (blk_mq_alloc_tag_set(&dev->tagset))
			return 0;
1886
		dev->ctrl.tagset = &dev->tagset;
1887 1888

		nvme_dbbuf_set(dev);
1889 1890 1891 1892 1893
	} else {
		blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1);

		/* Free previously allocated queues that are no longer usable */
		nvme_free_queues(dev, dev->online_queues);
1894
	}
1895

K
Keith Busch 已提交
1896
	return 0;
M
Matthew Wilcox 已提交
1897 1898
}

1899
static int nvme_pci_enable(struct nvme_dev *dev)
1900
{
1901
	int result = -ENOMEM;
1902
	struct pci_dev *pdev = to_pci_dev(dev->dev);
1903 1904 1905 1906 1907 1908

	if (pci_enable_device_mem(pdev))
		return result;

	pci_set_master(pdev);

1909 1910
	if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) &&
	    dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32)))
1911
		goto disable;
1912

1913
	if (readl(dev->bar + NVME_REG_CSTS) == -1) {
K
Keith Busch 已提交
1914
		result = -ENODEV;
1915
		goto disable;
K
Keith Busch 已提交
1916
	}
1917 1918

	/*
1919 1920 1921
	 * Some devices and/or platforms don't advertise or work with INTx
	 * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll
	 * adjust this later.
1922
	 */
1923 1924 1925
	result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
	if (result < 0)
		return result;
1926

1927
	dev->ctrl.cap = lo_hi_readq(dev->bar + NVME_REG_CAP);
1928

1929
	dev->q_depth = min_t(int, NVME_CAP_MQES(dev->ctrl.cap) + 1,
1930
				io_queue_depth);
1931
	dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap);
1932
	dev->dbs = dev->bar + 4096;
1933 1934 1935 1936 1937 1938 1939

	/*
	 * Temporary fix for the Apple controller found in the MacBook8,1 and
	 * some MacBook7,1 to avoid controller resets and data loss.
	 */
	if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) {
		dev->q_depth = 2;
1940 1941
		dev_warn(dev->ctrl.device, "detected Apple NVMe controller, "
			"set queue depth=%u to work around controller resets\n",
1942
			dev->q_depth);
1943 1944
	} else if (pdev->vendor == PCI_VENDOR_ID_SAMSUNG &&
		   (pdev->device == 0xa821 || pdev->device == 0xa822) &&
1945
		   NVME_CAP_MQES(dev->ctrl.cap) == 0) {
1946 1947 1948
		dev->q_depth = 64;
		dev_err(dev->ctrl.device, "detected PM1725 NVMe controller, "
                        "set queue depth=%u\n", dev->q_depth);
1949 1950
	}

1951 1952
	/*
	 * CMBs can currently only exist on >=1.2 PCIe devices. We only
1953 1954 1955
	 * populate sysfs if a CMB is implemented. Since nvme_dev_attrs_group
	 * has no name we can pass NULL as final argument to
	 * sysfs_add_file_to_group.
1956 1957
	 */

1958
	if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2, 0)) {
1959
		dev->cmb = nvme_map_cmb(dev);
1960
		if (dev->cmb) {
1961 1962
			if (sysfs_add_file_to_group(&dev->ctrl.device->kobj,
						    &dev_attr_cmb.attr, NULL))
1963
				dev_warn(dev->ctrl.device,
1964 1965 1966 1967
					 "failed to add sysfs attribute for CMB\n");
		}
	}

K
Keith Busch 已提交
1968 1969
	pci_enable_pcie_error_reporting(pdev);
	pci_save_state(pdev);
1970 1971 1972 1973 1974 1975 1976 1977
	return 0;

 disable:
	pci_disable_device(pdev);
	return result;
}

static void nvme_dev_unmap(struct nvme_dev *dev)
1978 1979 1980
{
	if (dev->bar)
		iounmap(dev->bar);
1981
	pci_release_mem_regions(to_pci_dev(dev->dev));
1982 1983 1984
}

static void nvme_pci_disable(struct nvme_dev *dev)
1985
{
1986 1987
	struct pci_dev *pdev = to_pci_dev(dev->dev);

1988
	nvme_release_cmb(dev);
1989
	pci_free_irq_vectors(pdev);
1990

K
Keith Busch 已提交
1991 1992
	if (pci_is_enabled(pdev)) {
		pci_disable_pcie_error_reporting(pdev);
1993
		pci_disable_device(pdev);
K
Keith Busch 已提交
1994 1995 1996
	}
}

1997
static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown)
M
Matthew Wilcox 已提交
1998
{
1999
	int i, queues;
K
Keith Busch 已提交
2000 2001
	bool dead = true;
	struct pci_dev *pdev = to_pci_dev(dev->dev);
2002

2003
	mutex_lock(&dev->shutdown_lock);
K
Keith Busch 已提交
2004 2005 2006
	if (pci_is_enabled(pdev)) {
		u32 csts = readl(dev->bar + NVME_REG_CSTS);

K
Keith Busch 已提交
2007 2008
		if (dev->ctrl.state == NVME_CTRL_LIVE ||
		    dev->ctrl.state == NVME_CTRL_RESETTING)
K
Keith Busch 已提交
2009 2010 2011
			nvme_start_freeze(&dev->ctrl);
		dead = !!((csts & NVME_CSTS_CFS) || !(csts & NVME_CSTS_RDY) ||
			pdev->error_state  != pci_channel_io_normal);
2012
	}
2013

K
Keith Busch 已提交
2014 2015 2016 2017
	/*
	 * Give the controller a chance to complete all entered requests if
	 * doing a safe shutdown.
	 */
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031
	if (!dead) {
		if (shutdown)
			nvme_wait_freeze_timeout(&dev->ctrl, NVME_IO_TIMEOUT);

		/*
		 * If the controller is still alive tell it to stop using the
		 * host memory buffer.  In theory the shutdown / reset should
		 * make sure that it doesn't access the host memoery anymore,
		 * but I'd rather be safe than sorry..
		 */
		if (dev->host_mem_descs)
			nvme_set_host_mem(dev, 0);

	}
K
Keith Busch 已提交
2032 2033
	nvme_stop_queues(&dev->ctrl);

2034
	queues = dev->online_queues - 1;
2035
	for (i = dev->ctrl.queue_count - 1; i > 0; i--)
2036 2037
		nvme_suspend_queue(dev->queues[i]);

K
Keith Busch 已提交
2038
	if (dead) {
2039 2040 2041 2042
		/* A device might become IO incapable very soon during
		 * probe, before the admin queue is configured. Thus,
		 * queue_count can be 0 here.
		 */
2043
		if (dev->ctrl.queue_count)
2044
			nvme_suspend_queue(dev->queues[0]);
K
Keith Busch 已提交
2045
	} else {
2046
		nvme_disable_io_queues(dev, queues);
2047
		nvme_disable_admin_queue(dev, shutdown);
K
Keith Busch 已提交
2048
	}
2049
	nvme_pci_disable(dev);
2050

2051 2052
	blk_mq_tagset_busy_iter(&dev->tagset, nvme_cancel_request, &dev->ctrl);
	blk_mq_tagset_busy_iter(&dev->admin_tagset, nvme_cancel_request, &dev->ctrl);
K
Keith Busch 已提交
2053 2054 2055 2056 2057 2058 2059 2060

	/*
	 * The driver will not be starting up queues again if shutting down so
	 * must flush all entered requests to their failed completion to avoid
	 * deadlocking blk-mq hot-cpu notifier.
	 */
	if (shutdown)
		nvme_start_queues(&dev->ctrl);
2061
	mutex_unlock(&dev->shutdown_lock);
M
Matthew Wilcox 已提交
2062 2063
}

M
Matthew Wilcox 已提交
2064 2065
static int nvme_setup_prp_pools(struct nvme_dev *dev)
{
2066
	dev->prp_page_pool = dma_pool_create("prp list page", dev->dev,
M
Matthew Wilcox 已提交
2067 2068 2069 2070
						PAGE_SIZE, PAGE_SIZE, 0);
	if (!dev->prp_page_pool)
		return -ENOMEM;

2071
	/* Optimisation for I/Os between 4k and 128k */
2072
	dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev,
2073 2074 2075 2076 2077
						256, 256, 0);
	if (!dev->prp_small_pool) {
		dma_pool_destroy(dev->prp_page_pool);
		return -ENOMEM;
	}
M
Matthew Wilcox 已提交
2078 2079 2080 2081 2082 2083
	return 0;
}

static void nvme_release_prp_pools(struct nvme_dev *dev)
{
	dma_pool_destroy(dev->prp_page_pool);
2084
	dma_pool_destroy(dev->prp_small_pool);
M
Matthew Wilcox 已提交
2085 2086
}

2087
static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
2088
{
2089
	struct nvme_dev *dev = to_nvme_dev(ctrl);
2090

2091
	nvme_dbbuf_dma_free(dev);
2092
	put_device(dev->dev);
2093 2094
	if (dev->tagset.tags)
		blk_mq_free_tag_set(&dev->tagset);
2095 2096
	if (dev->ctrl.admin_q)
		blk_put_queue(dev->ctrl.admin_q);
2097
	kfree(dev->queues);
2098
	free_opal_dev(dev->ctrl.opal_dev);
2099 2100 2101
	kfree(dev);
}

2102 2103
static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status)
{
2104
	dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status);
2105 2106

	kref_get(&dev->ctrl.kref);
2107
	nvme_dev_disable(dev, false);
2108 2109 2110 2111
	if (!schedule_work(&dev->remove_work))
		nvme_put_ctrl(&dev->ctrl);
}

2112
static void nvme_reset_work(struct work_struct *work)
2113
{
2114 2115
	struct nvme_dev *dev =
		container_of(work, struct nvme_dev, ctrl.reset_work);
2116
	bool was_suspend = !!(dev->ctrl.ctrl_config & NVME_CC_SHN_NORMAL);
2117
	int result = -ENODEV;
2118

2119
	if (WARN_ON(dev->ctrl.state != NVME_CTRL_RESETTING))
2120
		goto out;
2121

2122 2123 2124 2125
	/*
	 * If we're called to reset a live controller first shut it down before
	 * moving on.
	 */
2126
	if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
2127
		nvme_dev_disable(dev, false);
2128

2129
	result = nvme_pci_enable(dev);
2130
	if (result)
2131
		goto out;
2132

2133
	result = nvme_pci_configure_admin_queue(dev);
2134
	if (result)
2135
		goto out;
2136

M
Matias Bjørling 已提交
2137
	nvme_init_queue(dev->queues[0], 0);
K
Keith Busch 已提交
2138 2139
	result = nvme_alloc_admin_tags(dev);
	if (result)
2140
		goto out;
2141

2142 2143
	result = nvme_init_identify(&dev->ctrl);
	if (result)
2144
		goto out;
2145

2146 2147 2148 2149 2150 2151 2152 2153 2154
	if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) {
		if (!dev->ctrl.opal_dev)
			dev->ctrl.opal_dev =
				init_opal_dev(&dev->ctrl, &nvme_sec_submit);
		else if (was_suspend)
			opal_unlock_from_suspend(dev->ctrl.opal_dev);
	} else {
		free_opal_dev(dev->ctrl.opal_dev);
		dev->ctrl.opal_dev = NULL;
2155
	}
2156

2157 2158 2159 2160 2161 2162 2163
	if (dev->ctrl.oacs & NVME_CTRL_OACS_DBBUF_SUPP) {
		result = nvme_dbbuf_dma_alloc(dev);
		if (result)
			dev_warn(dev->dev,
				 "unable to allocate dma for dbbuf\n");
	}

2164 2165 2166
	if (dev->ctrl.hmpre)
		nvme_setup_host_mem(dev);

2167
	result = nvme_setup_io_queues(dev);
2168
	if (result)
2169
		goto out;
2170

2171 2172 2173 2174
	/*
	 * Keep the controller around but remove all namespaces if we don't have
	 * any working I/O queue.
	 */
2175
	if (dev->online_queues < 2) {
2176
		dev_warn(dev->ctrl.device, "IO queues not created\n");
2177
		nvme_kill_queues(&dev->ctrl);
2178
		nvme_remove_namespaces(&dev->ctrl);
2179
	} else {
2180
		nvme_start_queues(&dev->ctrl);
K
Keith Busch 已提交
2181
		nvme_wait_freeze(&dev->ctrl);
2182
		nvme_dev_add(dev);
K
Keith Busch 已提交
2183
		nvme_unfreeze(&dev->ctrl);
2184 2185
	}

2186 2187 2188 2189
	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_LIVE)) {
		dev_warn(dev->ctrl.device, "failed to mark controller live\n");
		goto out;
	}
2190

2191
	nvme_start_ctrl(&dev->ctrl);
2192
	return;
2193

2194
 out:
2195
	nvme_remove_dead_ctrl(dev, result);
2196 2197
}

2198
static void nvme_remove_dead_ctrl_work(struct work_struct *work)
K
Keith Busch 已提交
2199
{
2200
	struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work);
2201
	struct pci_dev *pdev = to_pci_dev(dev->dev);
K
Keith Busch 已提交
2202

2203
	nvme_kill_queues(&dev->ctrl);
K
Keith Busch 已提交
2204
	if (pci_get_drvdata(pdev))
K
Keith Busch 已提交
2205
		device_release_driver(&pdev->dev);
2206
	nvme_put_ctrl(&dev->ctrl);
K
Keith Busch 已提交
2207 2208
}

2209
static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
T
Tejun Heo 已提交
2210
{
2211
	*val = readl(to_nvme_dev(ctrl)->bar + off);
2212
	return 0;
T
Tejun Heo 已提交
2213 2214
}

2215
static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
2216
{
2217 2218 2219
	writel(val, to_nvme_dev(ctrl)->bar + off);
	return 0;
}
2220

2221 2222 2223 2224
static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
{
	*val = readq(to_nvme_dev(ctrl)->bar + off);
	return 0;
2225 2226
}

2227
static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
M
Ming Lin 已提交
2228
	.name			= "pcie",
2229
	.module			= THIS_MODULE,
2230
	.flags			= NVME_F_METADATA_SUPPORTED,
2231
	.reg_read32		= nvme_pci_reg_read32,
2232
	.reg_write32		= nvme_pci_reg_write32,
2233
	.reg_read64		= nvme_pci_reg_read64,
2234
	.free_ctrl		= nvme_pci_free_ctrl,
2235
	.submit_async_event	= nvme_pci_submit_async_event,
2236
};
2237

2238 2239 2240 2241
static int nvme_dev_map(struct nvme_dev *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev->dev);

2242
	if (pci_request_mem_regions(pdev, "nvme"))
2243 2244
		return -ENODEV;

2245
	if (nvme_remap_bar(dev, NVME_REG_DBS + 4096))
2246 2247
		goto release;

M
Max Gurtovoy 已提交
2248
	return 0;
2249
  release:
M
Max Gurtovoy 已提交
2250 2251
	pci_release_mem_regions(pdev);
	return -ENODEV;
2252 2253
}

2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273
static unsigned long check_dell_samsung_bug(struct pci_dev *pdev)
{
	if (pdev->vendor == 0x144d && pdev->device == 0xa802) {
		/*
		 * Several Samsung devices seem to drop off the PCIe bus
		 * randomly when APST is on and uses the deepest sleep state.
		 * This has been observed on a Samsung "SM951 NVMe SAMSUNG
		 * 256GB", a "PM951 NVMe SAMSUNG 512GB", and a "Samsung SSD
		 * 950 PRO 256GB", but it seems to be restricted to two Dell
		 * laptops.
		 */
		if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.") &&
		    (dmi_match(DMI_PRODUCT_NAME, "XPS 15 9550") ||
		     dmi_match(DMI_PRODUCT_NAME, "Precision 5510")))
			return NVME_QUIRK_NO_DEEPEST_PS;
	}

	return 0;
}

2274
static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
M
Matthew Wilcox 已提交
2275
{
M
Matias Bjørling 已提交
2276
	int node, result = -ENOMEM;
M
Matthew Wilcox 已提交
2277
	struct nvme_dev *dev;
2278
	unsigned long quirks = id->driver_data;
M
Matthew Wilcox 已提交
2279

M
Matias Bjørling 已提交
2280 2281
	node = dev_to_node(&pdev->dev);
	if (node == NUMA_NO_NODE)
2282
		set_dev_node(&pdev->dev, first_memory_node);
M
Matias Bjørling 已提交
2283 2284

	dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node);
M
Matthew Wilcox 已提交
2285 2286
	if (!dev)
		return -ENOMEM;
M
Matias Bjørling 已提交
2287 2288
	dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *),
							GFP_KERNEL, node);
M
Matthew Wilcox 已提交
2289 2290 2291
	if (!dev->queues)
		goto free;

2292
	dev->dev = get_device(&pdev->dev);
K
Keith Busch 已提交
2293
	pci_set_drvdata(pdev, dev);
2294

2295 2296
	result = nvme_dev_map(dev);
	if (result)
2297
		goto put_pci;
2298

2299
	INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work);
2300
	INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
2301
	mutex_init(&dev->shutdown_lock);
K
Keith Busch 已提交
2302
	init_completion(&dev->ioq_wait);
M
Matthew Wilcox 已提交
2303

M
Matthew Wilcox 已提交
2304 2305
	result = nvme_setup_prp_pools(dev);
	if (result)
2306
		goto unmap;
2307

2308 2309
	quirks |= check_dell_samsung_bug(pdev);

2310
	result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops,
2311
			quirks);
2312
	if (result)
2313
		goto release_pools;
2314

2315
	nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RESETTING);
2316 2317
	dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));

2318
	queue_work(nvme_wq, &dev->ctrl.reset_work);
M
Matthew Wilcox 已提交
2319 2320
	return 0;

2321
 release_pools:
M
Matthew Wilcox 已提交
2322
	nvme_release_prp_pools(dev);
2323 2324
 unmap:
	nvme_dev_unmap(dev);
K
Keith Busch 已提交
2325
 put_pci:
2326
	put_device(dev->dev);
M
Matthew Wilcox 已提交
2327 2328 2329 2330 2331 2332
 free:
	kfree(dev->queues);
	kfree(dev);
	return result;
}

2333
static void nvme_reset_prepare(struct pci_dev *pdev)
2334
{
K
Keith Busch 已提交
2335
	struct nvme_dev *dev = pci_get_drvdata(pdev);
2336
	nvme_dev_disable(dev, false);
2337
}
2338

2339 2340
static void nvme_reset_done(struct pci_dev *pdev)
{
2341 2342
	struct nvme_dev *dev = pci_get_drvdata(pdev);
	nvme_reset_ctrl(&dev->ctrl);
2343 2344
}

2345 2346 2347
static void nvme_shutdown(struct pci_dev *pdev)
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);
2348
	nvme_dev_disable(dev, true);
2349 2350
}

2351 2352 2353 2354 2355
/*
 * The driver's remove may be called on a device in a partially initialized
 * state. This function must not have any dependencies on the device state in
 * order to proceed.
 */
2356
static void nvme_remove(struct pci_dev *pdev)
M
Matthew Wilcox 已提交
2357 2358
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);
K
Keith Busch 已提交
2359

2360 2361
	nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING);

2362
	cancel_work_sync(&dev->ctrl.reset_work);
K
Keith Busch 已提交
2363
	pci_set_drvdata(pdev, NULL);
2364

2365
	if (!pci_device_is_present(pdev)) {
2366
		nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD);
2367 2368
		nvme_dev_disable(dev, false);
	}
2369

2370
	flush_work(&dev->ctrl.reset_work);
2371 2372
	nvme_stop_ctrl(&dev->ctrl);
	nvme_remove_namespaces(&dev->ctrl);
2373
	nvme_dev_disable(dev, true);
2374
	nvme_free_host_mem(dev);
M
Matias Bjørling 已提交
2375
	nvme_dev_remove_admin(dev);
2376
	nvme_free_queues(dev, 0);
2377
	nvme_uninit_ctrl(&dev->ctrl);
K
Keith Busch 已提交
2378
	nvme_release_prp_pools(dev);
2379
	nvme_dev_unmap(dev);
2380
	nvme_put_ctrl(&dev->ctrl);
M
Matthew Wilcox 已提交
2381 2382
}

K
Keith Busch 已提交
2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400
static int nvme_pci_sriov_configure(struct pci_dev *pdev, int numvfs)
{
	int ret = 0;

	if (numvfs == 0) {
		if (pci_vfs_assigned(pdev)) {
			dev_warn(&pdev->dev,
				"Cannot disable SR-IOV VFs while assigned\n");
			return -EPERM;
		}
		pci_disable_sriov(pdev);
		return 0;
	}

	ret = pci_enable_sriov(pdev, numvfs);
	return ret ? ret : numvfs;
}

2401
#ifdef CONFIG_PM_SLEEP
2402 2403 2404 2405 2406
static int nvme_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct nvme_dev *ndev = pci_get_drvdata(pdev);

2407
	nvme_dev_disable(ndev, true);
2408 2409 2410 2411 2412 2413 2414 2415
	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);

2416
	nvme_reset_ctrl(&ndev->ctrl);
K
Keith Busch 已提交
2417
	return 0;
2418
}
2419
#endif
2420 2421

static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
M
Matthew Wilcox 已提交
2422

K
Keith Busch 已提交
2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev,
						pci_channel_state_t state)
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);

	/*
	 * A frozen channel requires a reset. When detected, this method will
	 * shutdown the controller to quiesce. The controller will be restarted
	 * after the slot reset through driver's slot_reset callback.
	 */
	switch (state) {
	case pci_channel_io_normal:
		return PCI_ERS_RESULT_CAN_RECOVER;
	case pci_channel_io_frozen:
K
Keith Busch 已提交
2437 2438
		dev_warn(dev->ctrl.device,
			"frozen state error detected, reset controller\n");
2439
		nvme_dev_disable(dev, false);
K
Keith Busch 已提交
2440 2441
		return PCI_ERS_RESULT_NEED_RESET;
	case pci_channel_io_perm_failure:
K
Keith Busch 已提交
2442 2443
		dev_warn(dev->ctrl.device,
			"failure state error detected, request disconnect\n");
K
Keith Busch 已提交
2444 2445 2446 2447 2448 2449 2450 2451 2452
		return PCI_ERS_RESULT_DISCONNECT;
	}
	return PCI_ERS_RESULT_NEED_RESET;
}

static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev)
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);

2453
	dev_info(dev->ctrl.device, "restart after slot reset\n");
K
Keith Busch 已提交
2454
	pci_restore_state(pdev);
2455
	nvme_reset_ctrl(&dev->ctrl);
K
Keith Busch 已提交
2456 2457 2458 2459 2460 2461 2462 2463
	return PCI_ERS_RESULT_RECOVERED;
}

static void nvme_error_resume(struct pci_dev *pdev)
{
	pci_cleanup_aer_uncorrect_error_status(pdev);
}

2464
static const struct pci_error_handlers nvme_err_handler = {
M
Matthew Wilcox 已提交
2465 2466 2467
	.error_detected	= nvme_error_detected,
	.slot_reset	= nvme_slot_reset,
	.resume		= nvme_error_resume,
2468 2469
	.reset_prepare	= nvme_reset_prepare,
	.reset_done	= nvme_reset_done,
M
Matthew Wilcox 已提交
2470 2471
};

2472
static const struct pci_device_id nvme_id_table[] = {
2473
	{ PCI_VDEVICE(INTEL, 0x0953),
2474
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2475
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2476 2477
	{ PCI_VDEVICE(INTEL, 0x0a53),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2478
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2479 2480
	{ PCI_VDEVICE(INTEL, 0x0a54),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2481
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2482 2483 2484
	{ PCI_VDEVICE(INTEL, 0x0a55),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2485 2486
	{ PCI_VDEVICE(INTEL, 0xf1a5),	/* Intel 600P/P3100 */
		.driver_data = NVME_QUIRK_NO_DEEPEST_PS },
2487 2488
	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */
		.driver_data = NVME_QUIRK_IDENTIFY_CNS, },
2489 2490
	{ PCI_DEVICE(0x1c58, 0x0003),	/* HGST adapter */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
2491 2492
	{ PCI_DEVICE(0x1c5f, 0x0540),	/* Memblaze Pblaze4 adapter */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
2493 2494 2495 2496
	{ PCI_DEVICE(0x144d, 0xa821),   /* Samsung PM1725 */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
	{ PCI_DEVICE(0x144d, 0xa822),   /* Samsung PM1725a */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
M
Matthew Wilcox 已提交
2497
	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
2498
	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) },
2499
	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },
M
Matthew Wilcox 已提交
2500 2501 2502 2503 2504 2505 2506 2507
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, nvme_id_table);

static struct pci_driver nvme_driver = {
	.name		= "nvme",
	.id_table	= nvme_id_table,
	.probe		= nvme_probe,
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	.remove		= nvme_remove,
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	.shutdown	= nvme_shutdown,
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	.driver		= {
		.pm	= &nvme_dev_pm_ops,
	},
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	.sriov_configure = nvme_pci_sriov_configure,
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	.err_handler	= &nvme_err_handler,
};

static int __init nvme_init(void)
{
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	return pci_register_driver(&nvme_driver);
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}

static void __exit nvme_exit(void)
{
	pci_unregister_driver(&nvme_driver);
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	_nvme_check_size();
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}

MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
MODULE_LICENSE("GPL");
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MODULE_VERSION("1.0");
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module_init(nvme_init);
module_exit(nvme_exit);