pci.c 59.3 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/cpu.h>
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#include <linux/delay.h>
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#include <linux/dmi.h>
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#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/genhd.h>
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#include <linux/hdreg.h>
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#include <linux/idr.h>
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#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kdev_t.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/moduleparam.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/ptrace.h>
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#include <linux/sched.h>
#include <linux/slab.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 NVME_Q_DEPTH		1024
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#define NVME_AQ_DEPTH		256
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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 struct workqueue_struct *nvme_workq;
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struct nvme_dev;
struct nvme_queue;
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static int nvme_reset(struct nvme_dev *dev);
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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 queue_count;
	unsigned online_queues;
	unsigned max_qid;
	int q_depth;
	u32 db_stride;
	void __iomem *bar;
	struct work_struct reset_work;
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	struct work_struct remove_work;
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	struct timer_list watchdog_timer;
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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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	u32 *dbbuf_dbs;
	dma_addr_t dbbuf_dbs_dma_addr;
	u32 *dbbuf_eis;
	dma_addr_t dbbuf_eis_dma_addr;
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};
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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);
	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);
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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_admin_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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	struct nvme_queue *nvmeq = dev->queues[0];

	BUG_ON(!nvmeq);
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	iod->nvmeq = nvmeq;
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	return 0;
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}

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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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	struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];

	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 int 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)
			return BLK_MQ_RQ_QUEUE_BUSY;
	} 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_MQ_RQ_QUEUE_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);
}
527 528 529 530 531 532 533 534 535 536 537 538 539
#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

540
static bool nvme_setup_prps(struct nvme_dev *dev, struct request *req)
M
Matthew Wilcox 已提交
541
{
C
Christoph Hellwig 已提交
542
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
543
	struct dma_pool *pool;
544
	int length = blk_rq_payload_bytes(req);
545
	struct scatterlist *sg = iod->sg;
M
Matthew Wilcox 已提交
546 547
	int dma_len = sg_dma_len(sg);
	u64 dma_addr = sg_dma_address(sg);
548
	u32 page_size = dev->ctrl.page_size;
549
	int offset = dma_addr & (page_size - 1);
550
	__le64 *prp_list;
C
Christoph Hellwig 已提交
551
	__le64 **list = iod_list(req);
552
	dma_addr_t prp_dma;
553
	int nprps, i;
M
Matthew Wilcox 已提交
554

555
	length -= (page_size - offset);
M
Matthew Wilcox 已提交
556
	if (length <= 0)
557
		return true;
M
Matthew Wilcox 已提交
558

559
	dma_len -= (page_size - offset);
M
Matthew Wilcox 已提交
560
	if (dma_len) {
561
		dma_addr += (page_size - offset);
M
Matthew Wilcox 已提交
562 563 564 565 566 567
	} else {
		sg = sg_next(sg);
		dma_addr = sg_dma_address(sg);
		dma_len = sg_dma_len(sg);
	}

568
	if (length <= page_size) {
569
		iod->first_dma = dma_addr;
570
		return true;
571 572
	}

573
	nprps = DIV_ROUND_UP(length, page_size);
574 575
	if (nprps <= (256 / 8)) {
		pool = dev->prp_small_pool;
576
		iod->npages = 0;
577 578
	} else {
		pool = dev->prp_page_pool;
579
		iod->npages = 1;
580 581
	}

582
	prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
583
	if (!prp_list) {
584
		iod->first_dma = dma_addr;
585
		iod->npages = -1;
586
		return false;
587
	}
588 589
	list[0] = prp_list;
	iod->first_dma = prp_dma;
590 591
	i = 0;
	for (;;) {
592
		if (i == page_size >> 3) {
593
			__le64 *old_prp_list = prp_list;
594
			prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
595
			if (!prp_list)
596
				return false;
597
			list[iod->npages++] = prp_list;
598 599 600
			prp_list[0] = old_prp_list[i - 1];
			old_prp_list[i - 1] = cpu_to_le64(prp_dma);
			i = 1;
601 602
		}
		prp_list[i++] = cpu_to_le64(dma_addr);
603 604 605
		dma_len -= page_size;
		dma_addr += page_size;
		length -= page_size;
606 607 608 609 610 611 612 613
		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);
M
Matthew Wilcox 已提交
614 615
	}

616
	return true;
M
Matthew Wilcox 已提交
617 618
}

C
Christoph Hellwig 已提交
619
static int nvme_map_data(struct nvme_dev *dev, struct request *req,
620
		struct nvme_command *cmnd)
621
{
C
Christoph Hellwig 已提交
622
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
C
Christoph Hellwig 已提交
623 624 625 626
	struct request_queue *q = req->q;
	enum dma_data_direction dma_dir = rq_data_dir(req) ?
			DMA_TO_DEVICE : DMA_FROM_DEVICE;
	int ret = BLK_MQ_RQ_QUEUE_ERROR;
627

628
	sg_init_table(iod->sg, blk_rq_nr_phys_segments(req));
C
Christoph Hellwig 已提交
629 630 631
	iod->nents = blk_rq_map_sg(q, req, iod->sg);
	if (!iod->nents)
		goto out;
632

C
Christoph Hellwig 已提交
633
	ret = BLK_MQ_RQ_QUEUE_BUSY;
634 635
	if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir,
				DMA_ATTR_NO_WARN))
C
Christoph Hellwig 已提交
636
		goto out;
637

638
	if (!nvme_setup_prps(dev, req))
C
Christoph Hellwig 已提交
639
		goto out_unmap;
640

C
Christoph Hellwig 已提交
641 642 643 644
	ret = BLK_MQ_RQ_QUEUE_ERROR;
	if (blk_integrity_rq(req)) {
		if (blk_rq_count_integrity_sg(q, req->bio) != 1)
			goto out_unmap;
645

646 647
		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
648
			goto out_unmap;
649

C
Christoph Hellwig 已提交
650 651
		if (rq_data_dir(req))
			nvme_dif_remap(req, nvme_dif_prep);
652

653
		if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir))
C
Christoph Hellwig 已提交
654
			goto out_unmap;
655
	}
M
Matthew Wilcox 已提交
656

657 658
	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
659
	if (blk_integrity_rq(req))
660
		cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg));
C
Christoph Hellwig 已提交
661
	return BLK_MQ_RQ_QUEUE_OK;
M
Matthew Wilcox 已提交
662

C
Christoph Hellwig 已提交
663 664 665 666
out_unmap:
	dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
out:
	return ret;
M
Matthew Wilcox 已提交
667 668
}

C
Christoph Hellwig 已提交
669
static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
M
Matthew Wilcox 已提交
670
{
C
Christoph Hellwig 已提交
671
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
672 673 674 675 676 677 678 679
	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);
680
			dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir);
K
Keith Busch 已提交
681
		}
682
	}
K
Keith Busch 已提交
683

684
	nvme_cleanup_cmd(req);
C
Christoph Hellwig 已提交
685
	nvme_free_iod(dev, req);
686
}
M
Matthew Wilcox 已提交
687

688 689 690
/*
 * NOTE: ns is NULL when called on the admin queue.
 */
M
Matias Bjørling 已提交
691 692
static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
			 const struct blk_mq_queue_data *bd)
693
{
M
Matias Bjørling 已提交
694 695
	struct nvme_ns *ns = hctx->queue->queuedata;
	struct nvme_queue *nvmeq = hctx->driver_data;
696
	struct nvme_dev *dev = nvmeq->dev;
M
Matias Bjørling 已提交
697
	struct request *req = bd->rq;
C
Christoph Hellwig 已提交
698 699
	struct nvme_command cmnd;
	int ret = BLK_MQ_RQ_QUEUE_OK;
700

K
Keith Busch 已提交
701 702 703 704 705
	/*
	 * 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.
	 */
706
	if (ns && ns->ms && !blk_integrity_rq(req)) {
707
		if (!(ns->pi_type && ns->ms == 8) &&
708
		    !blk_rq_is_passthrough(req)) {
709
			blk_mq_end_request(req, -EFAULT);
K
Keith Busch 已提交
710 711 712 713
			return BLK_MQ_RQ_QUEUE_OK;
		}
	}

714
	ret = nvme_setup_cmd(ns, req, &cmnd);
715
	if (ret != BLK_MQ_RQ_QUEUE_OK)
C
Christoph Hellwig 已提交
716
		return ret;
M
Matias Bjørling 已提交
717

718
	ret = nvme_init_iod(req, dev);
719
	if (ret != BLK_MQ_RQ_QUEUE_OK)
720
		goto out_free_cmd;
M
Matias Bjørling 已提交
721

722
	if (blk_rq_nr_phys_segments(req))
723
		ret = nvme_map_data(dev, req, &cmnd);
M
Matias Bjørling 已提交
724

725
	if (ret != BLK_MQ_RQ_QUEUE_OK)
726
		goto out_cleanup_iod;
M
Matias Bjørling 已提交
727

728
	blk_mq_start_request(req);
M
Matias Bjørling 已提交
729

C
Christoph Hellwig 已提交
730
	spin_lock_irq(&nvmeq->q_lock);
731
	if (unlikely(nvmeq->cq_vector < 0)) {
732
		ret = BLK_MQ_RQ_QUEUE_ERROR;
733
		spin_unlock_irq(&nvmeq->q_lock);
734
		goto out_cleanup_iod;
735
	}
C
Christoph Hellwig 已提交
736
	__nvme_submit_cmd(nvmeq, &cmnd);
M
Matias Bjørling 已提交
737 738 739
	nvme_process_cq(nvmeq);
	spin_unlock_irq(&nvmeq->q_lock);
	return BLK_MQ_RQ_QUEUE_OK;
740
out_cleanup_iod:
C
Christoph Hellwig 已提交
741
	nvme_free_iod(dev, req);
742 743
out_free_cmd:
	nvme_cleanup_cmd(req);
C
Christoph Hellwig 已提交
744
	return ret;
M
Matthew Wilcox 已提交
745
}
K
Keith Busch 已提交
746

747
static void nvme_pci_complete_rq(struct request *req)
748
{
C
Christoph Hellwig 已提交
749
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
M
Matias Bjørling 已提交
750

751 752
	nvme_unmap_data(iod->nvmeq->dev, req);
	nvme_complete_rq(req);
M
Matthew Wilcox 已提交
753 754
}

755 756 757 758 759 760 761
/* 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;
}

J
Jens Axboe 已提交
762
static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag)
M
Matthew Wilcox 已提交
763
{
M
Matthew Wilcox 已提交
764
	u16 head, phase;
M
Matthew Wilcox 已提交
765 766

	head = nvmeq->cq_head;
M
Matthew Wilcox 已提交
767
	phase = nvmeq->cq_phase;
M
Matthew Wilcox 已提交
768

769
	while (nvme_cqe_valid(nvmeq, head, phase)) {
M
Matthew Wilcox 已提交
770
		struct nvme_completion cqe = nvmeq->cqes[head];
771
		struct request *req;
772

M
Matthew Wilcox 已提交
773 774
		if (++head == nvmeq->q_depth) {
			head = 0;
M
Matthew Wilcox 已提交
775
			phase = !phase;
M
Matthew Wilcox 已提交
776
		}
777

J
Jens Axboe 已提交
778 779
		if (tag && *tag == cqe.command_id)
			*tag = -1;
780

781
		if (unlikely(cqe.command_id >= nvmeq->q_depth)) {
782
			dev_warn(nvmeq->dev->ctrl.device,
783 784 785 786 787
				"invalid id %d completed on queue %d\n",
				cqe.command_id, le16_to_cpu(cqe.sq_id));
			continue;
		}

788 789 790 791 792 793 794 795
		/*
		 * 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)) {
796 797
			nvme_complete_async_event(&nvmeq->dev->ctrl,
					cqe.status, &cqe.result);
798 799 800
			continue;
		}

801
		req = blk_mq_tag_to_rq(*nvmeq->tags, cqe.command_id);
802
		nvme_end_request(req, cqe.status, cqe.result);
M
Matthew Wilcox 已提交
803 804
	}

M
Matthew Wilcox 已提交
805
	if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
J
Jens Axboe 已提交
806
		return;
M
Matthew Wilcox 已提交
807

808
	if (likely(nvmeq->cq_vector >= 0))
809 810 811
		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);
M
Matthew Wilcox 已提交
812
	nvmeq->cq_head = head;
M
Matthew Wilcox 已提交
813
	nvmeq->cq_phase = phase;
M
Matthew Wilcox 已提交
814

815
	nvmeq->cqe_seen = 1;
J
Jens Axboe 已提交
816 817 818 819 820
}

static void nvme_process_cq(struct nvme_queue *nvmeq)
{
	__nvme_process_cq(nvmeq, NULL);
M
Matthew Wilcox 已提交
821 822 823
}

static irqreturn_t nvme_irq(int irq, void *data)
824 825 826 827
{
	irqreturn_t result;
	struct nvme_queue *nvmeq = data;
	spin_lock(&nvmeq->q_lock);
828 829 830
	nvme_process_cq(nvmeq);
	result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE;
	nvmeq->cqe_seen = 0;
831 832 833 834 835 836 837
	spin_unlock(&nvmeq->q_lock);
	return result;
}

static irqreturn_t nvme_irq_check(int irq, void *data)
{
	struct nvme_queue *nvmeq = data;
838 839 840
	if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase))
		return IRQ_WAKE_THREAD;
	return IRQ_NONE;
841 842
}

K
Keith Busch 已提交
843
static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag)
J
Jens Axboe 已提交
844
{
845
	if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) {
J
Jens Axboe 已提交
846 847 848 849 850 851 852 853 854 855 856
		spin_lock_irq(&nvmeq->q_lock);
		__nvme_process_cq(nvmeq, &tag);
		spin_unlock_irq(&nvmeq->q_lock);

		if (tag == -1)
			return 1;
	}

	return 0;
}

K
Keith Busch 已提交
857 858 859 860 861 862 863
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);
}

864
static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx)
M
Matthew Wilcox 已提交
865
{
866
	struct nvme_dev *dev = to_nvme_dev(ctrl);
867
	struct nvme_queue *nvmeq = dev->queues[0];
M
Matias Bjørling 已提交
868
	struct nvme_command c;
M
Matthew Wilcox 已提交
869

M
Matias Bjørling 已提交
870 871
	memset(&c, 0, sizeof(c));
	c.common.opcode = nvme_admin_async_event;
872
	c.common.command_id = NVME_AQ_BLKMQ_DEPTH + aer_idx;
873

874
	spin_lock_irq(&nvmeq->q_lock);
875
	__nvme_submit_cmd(nvmeq, &c);
876
	spin_unlock_irq(&nvmeq->q_lock);
877 878
}

M
Matthew Wilcox 已提交
879
static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
880
{
M
Matthew Wilcox 已提交
881 882 883 884 885 886
	struct nvme_command c;

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

887
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
888 889 890 891 892 893 894 895
}

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;

896 897 898 899
	/*
	 * 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
900 901 902 903 904 905 906 907
	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);

908
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
909 910 911 912 913 914
}

static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
						struct nvme_queue *nvmeq)
{
	struct nvme_command c;
915
	int flags = NVME_QUEUE_PHYS_CONTIG;
M
Matthew Wilcox 已提交
916

917 918 919 920
	/*
	 * 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
921 922 923 924 925 926 927 928
	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);

929
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
930 931 932 933 934 935 936 937 938 939 940 941
}

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);
}

942
static void abort_endio(struct request *req, int error)
943
{
C
Christoph Hellwig 已提交
944 945
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	struct nvme_queue *nvmeq = iod->nvmeq;
946

947 948
	dev_warn(nvmeq->dev->ctrl.device,
		 "Abort status: 0x%x", nvme_req(req)->status);
949 950
	atomic_inc(&nvmeq->dev->ctrl.abort_limit);
	blk_mq_free_request(req);
951 952
}

953
static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
K
Keith Busch 已提交
954
{
C
Christoph Hellwig 已提交
955 956
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	struct nvme_queue *nvmeq = iod->nvmeq;
K
Keith Busch 已提交
957
	struct nvme_dev *dev = nvmeq->dev;
M
Matias Bjørling 已提交
958 959
	struct request *abort_req;
	struct nvme_command cmd;
K
Keith Busch 已提交
960

K
Keith Busch 已提交
961 962 963 964 965 966 967 968 969 970
	/*
	 * 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;
	}

971
	/*
972 973 974 975 976
	 * 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.
	 */
977
	if (dev->ctrl.state == NVME_CTRL_RESETTING) {
978
		dev_warn(dev->ctrl.device,
979 980
			 "I/O %d QID %d timeout, disable controller\n",
			 req->tag, nvmeq->qid);
981
		nvme_dev_disable(dev, false);
982
		nvme_req(req)->flags |= NVME_REQ_CANCELLED;
983
		return BLK_EH_HANDLED;
K
Keith Busch 已提交
984 985
	}

986 987 988 989
	/*
 	 * 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.
990
	 */
C
Christoph Hellwig 已提交
991
	if (!nvmeq->qid || iod->aborted) {
992
		dev_warn(dev->ctrl.device,
993 994
			 "I/O %d QID %d timeout, reset controller\n",
			 req->tag, nvmeq->qid);
995
		nvme_dev_disable(dev, false);
K
Keith Busch 已提交
996
		nvme_reset(dev);
K
Keith Busch 已提交
997

998 999 1000 1001
		/*
		 * Mark the request as handled, since the inline shutdown
		 * forces all outstanding requests to complete.
		 */
1002
		nvme_req(req)->flags |= NVME_REQ_CANCELLED;
1003
		return BLK_EH_HANDLED;
K
Keith Busch 已提交
1004 1005
	}

1006
	if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) {
1007
		atomic_inc(&dev->ctrl.abort_limit);
1008
		return BLK_EH_RESET_TIMER;
1009
	}
1010
	iod->aborted = 1;
M
Matias Bjørling 已提交
1011

K
Keith Busch 已提交
1012 1013
	memset(&cmd, 0, sizeof(cmd));
	cmd.abort.opcode = nvme_admin_abort_cmd;
M
Matias Bjørling 已提交
1014
	cmd.abort.cid = req->tag;
K
Keith Busch 已提交
1015 1016
	cmd.abort.sqid = cpu_to_le16(nvmeq->qid);

1017 1018 1019
	dev_warn(nvmeq->dev->ctrl.device,
		"I/O %d QID %d timeout, aborting\n",
		 req->tag, nvmeq->qid);
1020 1021

	abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd,
1022
			BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
1023 1024 1025 1026 1027 1028 1029 1030
	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
1031

1032 1033 1034 1035 1036 1037
	/*
	 * 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
1038 1039
}

M
Matias Bjørling 已提交
1040 1041
static void nvme_free_queue(struct nvme_queue *nvmeq)
{
1042 1043
	dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
				(void *)nvmeq->cqes, nvmeq->cq_dma_addr);
1044 1045
	if (nvmeq->sq_cmds)
		dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
1046 1047 1048 1049
					nvmeq->sq_cmds, nvmeq->sq_dma_addr);
	kfree(nvmeq);
}

1050
static void nvme_free_queues(struct nvme_dev *dev, int lowest)
1051 1052 1053
{
	int i;

1054
	for (i = dev->queue_count - 1; i >= lowest; i--) {
M
Matias Bjørling 已提交
1055
		struct nvme_queue *nvmeq = dev->queues[i];
1056
		dev->queue_count--;
M
Matias Bjørling 已提交
1057
		dev->queues[i] = NULL;
K
Keith Busch 已提交
1058
		nvme_free_queue(nvmeq);
1059
	}
1060 1061
}

K
Keith Busch 已提交
1062 1063 1064 1065 1066
/**
 * 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
1067
{
K
Keith Busch 已提交
1068
	int vector;
M
Matthew Wilcox 已提交
1069

1070
	spin_lock_irq(&nvmeq->q_lock);
K
Keith Busch 已提交
1071 1072 1073 1074
	if (nvmeq->cq_vector == -1) {
		spin_unlock_irq(&nvmeq->q_lock);
		return 1;
	}
1075
	vector = nvmeq->cq_vector;
K
Keith Busch 已提交
1076
	nvmeq->dev->online_queues--;
K
Keith Busch 已提交
1077
	nvmeq->cq_vector = -1;
1078 1079
	spin_unlock_irq(&nvmeq->q_lock);

1080
	if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q)
1081
		blk_mq_stop_hw_queues(nvmeq->dev->ctrl.admin_q);
1082

1083
	pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq);
M
Matthew Wilcox 已提交
1084

K
Keith Busch 已提交
1085 1086
	return 0;
}
M
Matthew Wilcox 已提交
1087

1088
static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
K
Keith Busch 已提交
1089
{
1090
	struct nvme_queue *nvmeq = dev->queues[0];
K
Keith Busch 已提交
1091 1092 1093 1094 1095 1096

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

1097 1098 1099 1100 1101
	if (shutdown)
		nvme_shutdown_ctrl(&dev->ctrl);
	else
		nvme_disable_ctrl(&dev->ctrl, lo_hi_readq(
						dev->bar + NVME_REG_CAP));
1102 1103 1104 1105

	spin_lock_irq(&nvmeq->q_lock);
	nvme_process_cq(nvmeq);
	spin_unlock_irq(&nvmeq->q_lock);
M
Matthew Wilcox 已提交
1106 1107
}

1108 1109 1110 1111
static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
				int entry_size)
{
	int q_depth = dev->q_depth;
1112 1113
	unsigned q_size_aligned = roundup(q_depth * entry_size,
					  dev->ctrl.page_size);
1114 1115

	if (q_size_aligned * nr_io_queues > dev->cmb_size) {
1116
		u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues);
1117
		mem_per_q = round_down(mem_per_q, dev->ctrl.page_size);
1118
		q_depth = div_u64(mem_per_q, entry_size);
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135

		/*
		 * 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)) {
1136 1137
		unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth),
						      dev->ctrl.page_size);
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
		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
1150
static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
1151
							int depth, int node)
M
Matthew Wilcox 已提交
1152
{
1153 1154
	struct nvme_queue *nvmeq = kzalloc_node(sizeof(*nvmeq), GFP_KERNEL,
							node);
M
Matthew Wilcox 已提交
1155 1156 1157
	if (!nvmeq)
		return NULL;

1158
	nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth),
J
Joe Perches 已提交
1159
					  &nvmeq->cq_dma_addr, GFP_KERNEL);
M
Matthew Wilcox 已提交
1160 1161 1162
	if (!nvmeq->cqes)
		goto free_nvmeq;

1163
	if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth))
M
Matthew Wilcox 已提交
1164 1165
		goto free_cqdma;

1166
	nvmeq->q_dmadev = dev->dev;
M
Matthew Wilcox 已提交
1167
	nvmeq->dev = dev;
M
Matthew Wilcox 已提交
1168 1169
	spin_lock_init(&nvmeq->q_lock);
	nvmeq->cq_head = 0;
M
Matthew Wilcox 已提交
1170
	nvmeq->cq_phase = 1;
1171
	nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
M
Matthew Wilcox 已提交
1172
	nvmeq->q_depth = depth;
K
Keith Busch 已提交
1173
	nvmeq->qid = qid;
1174
	nvmeq->cq_vector = -1;
M
Matias Bjørling 已提交
1175
	dev->queues[qid] = nvmeq;
1176 1177
	dev->queue_count++;

M
Matthew Wilcox 已提交
1178 1179 1180
	return nvmeq;

 free_cqdma:
1181
	dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes,
M
Matthew Wilcox 已提交
1182 1183 1184 1185 1186 1187
							nvmeq->cq_dma_addr);
 free_nvmeq:
	kfree(nvmeq);
	return NULL;
}

1188
static int queue_request_irq(struct nvme_queue *nvmeq)
1189
{
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
	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);
	}
1200 1201
}

1202
static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
M
Matthew Wilcox 已提交
1203
{
1204
	struct nvme_dev *dev = nvmeq->dev;
M
Matthew Wilcox 已提交
1205

1206
	spin_lock_irq(&nvmeq->q_lock);
1207 1208 1209
	nvmeq->sq_tail = 0;
	nvmeq->cq_head = 0;
	nvmeq->cq_phase = 1;
1210
	nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
1211
	memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
1212
	nvme_dbbuf_init(dev, nvmeq, qid);
K
Keith Busch 已提交
1213
	dev->online_queues++;
1214
	spin_unlock_irq(&nvmeq->q_lock);
1215 1216 1217 1218 1219 1220
}

static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
{
	struct nvme_dev *dev = nvmeq->dev;
	int result;
1221

K
Keith Busch 已提交
1222
	nvmeq->cq_vector = qid - 1;
M
Matthew Wilcox 已提交
1223 1224
	result = adapter_alloc_cq(dev, qid, nvmeq);
	if (result < 0)
1225
		return result;
M
Matthew Wilcox 已提交
1226 1227 1228 1229 1230

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

1231
	result = queue_request_irq(nvmeq);
M
Matthew Wilcox 已提交
1232 1233 1234
	if (result < 0)
		goto release_sq;

1235 1236
	nvme_init_queue(nvmeq, qid);
	return result;
M
Matthew Wilcox 已提交
1237 1238 1239 1240 1241

 release_sq:
	adapter_delete_sq(dev, qid);
 release_cq:
	adapter_delete_cq(dev, qid);
1242
	return result;
M
Matthew Wilcox 已提交
1243 1244
}

1245
static const struct blk_mq_ops nvme_mq_admin_ops = {
1246
	.queue_rq	= nvme_queue_rq,
1247
	.complete	= nvme_pci_complete_rq,
M
Matias Bjørling 已提交
1248
	.init_hctx	= nvme_admin_init_hctx,
1249
	.exit_hctx      = nvme_admin_exit_hctx,
M
Matias Bjørling 已提交
1250 1251 1252 1253
	.init_request	= nvme_admin_init_request,
	.timeout	= nvme_timeout,
};

1254
static const struct blk_mq_ops nvme_mq_ops = {
M
Matias Bjørling 已提交
1255
	.queue_rq	= nvme_queue_rq,
1256
	.complete	= nvme_pci_complete_rq,
M
Matias Bjørling 已提交
1257 1258
	.init_hctx	= nvme_init_hctx,
	.init_request	= nvme_init_request,
1259
	.map_queues	= nvme_pci_map_queues,
M
Matias Bjørling 已提交
1260
	.timeout	= nvme_timeout,
J
Jens Axboe 已提交
1261
	.poll		= nvme_poll,
M
Matias Bjørling 已提交
1262 1263
};

1264 1265
static void nvme_dev_remove_admin(struct nvme_dev *dev)
{
1266
	if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) {
1267 1268 1269 1270 1271 1272
		/*
		 * 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.
		 */
		blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true);
1273
		blk_cleanup_queue(dev->ctrl.admin_q);
1274 1275 1276 1277
		blk_mq_free_tag_set(&dev->admin_tagset);
	}
}

M
Matias Bjørling 已提交
1278 1279
static int nvme_alloc_admin_tags(struct nvme_dev *dev)
{
1280
	if (!dev->ctrl.admin_q) {
M
Matias Bjørling 已提交
1281 1282
		dev->admin_tagset.ops = &nvme_mq_admin_ops;
		dev->admin_tagset.nr_hw_queues = 1;
K
Keith Busch 已提交
1283 1284 1285 1286 1287 1288

		/*
		 * 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
1289
		dev->admin_tagset.timeout = ADMIN_TIMEOUT;
1290
		dev->admin_tagset.numa_node = dev_to_node(dev->dev);
1291
		dev->admin_tagset.cmd_size = nvme_cmd_size(dev);
1292
		dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED;
M
Matias Bjørling 已提交
1293 1294 1295 1296 1297
		dev->admin_tagset.driver_data = dev;

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

1298 1299
		dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset);
		if (IS_ERR(dev->ctrl.admin_q)) {
M
Matias Bjørling 已提交
1300 1301 1302
			blk_mq_free_tag_set(&dev->admin_tagset);
			return -ENOMEM;
		}
1303
		if (!blk_get_queue(dev->ctrl.admin_q)) {
1304
			nvme_dev_remove_admin(dev);
1305
			dev->ctrl.admin_q = NULL;
1306 1307
			return -ENODEV;
		}
K
Keith Busch 已提交
1308
	} else
1309
		blk_mq_start_stopped_hw_queues(dev->ctrl.admin_q, true);
M
Matias Bjørling 已提交
1310 1311 1312 1313

	return 0;
}

1314
static int nvme_configure_admin_queue(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1315
{
1316
	int result;
M
Matthew Wilcox 已提交
1317
	u32 aqa;
1318
	u64 cap = lo_hi_readq(dev->bar + NVME_REG_CAP);
M
Matthew Wilcox 已提交
1319 1320
	struct nvme_queue *nvmeq;

1321
	dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1, 0) ?
1322 1323
						NVME_CAP_NSSRC(cap) : 0;

1324 1325 1326
	if (dev->subsystem &&
	    (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO))
		writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS);
1327

1328
	result = nvme_disable_ctrl(&dev->ctrl, cap);
1329 1330
	if (result < 0)
		return result;
M
Matthew Wilcox 已提交
1331

M
Matias Bjørling 已提交
1332
	nvmeq = dev->queues[0];
1333
	if (!nvmeq) {
1334 1335
		nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH,
					dev_to_node(dev->dev));
1336 1337 1338
		if (!nvmeq)
			return -ENOMEM;
	}
M
Matthew Wilcox 已提交
1339 1340 1341 1342

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

1343 1344 1345
	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
1346

1347
	result = nvme_enable_ctrl(&dev->ctrl, cap);
1348
	if (result)
K
Keith Busch 已提交
1349
		return result;
M
Matias Bjørling 已提交
1350

K
Keith Busch 已提交
1351
	nvmeq->cq_vector = 0;
1352
	result = queue_request_irq(nvmeq);
1353 1354
	if (result) {
		nvmeq->cq_vector = -1;
K
Keith Busch 已提交
1355
		return result;
1356
	}
1357

M
Matthew Wilcox 已提交
1358 1359 1360
	return result;
}

1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
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 (work_busy(&dev->reset_work))
		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;
}

1388 1389 1390 1391 1392 1393 1394 1395 1396
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)
1397
		dev_warn(dev->ctrl.device,
1398 1399 1400
			 "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n",
			 csts, pci_status);
	else
1401
		dev_warn(dev->ctrl.device,
1402 1403 1404 1405
			 "controller is down; will reset: CSTS=0x%x, PCI_STATUS read failed (%d)\n",
			 csts, result);
}

1406
static void nvme_watchdog_timer(unsigned long data)
1407
{
1408 1409
	struct nvme_dev *dev = (struct nvme_dev *)data;
	u32 csts = readl(dev->bar + NVME_REG_CSTS);
1410

1411 1412
	/* Skip controllers under certain specific conditions. */
	if (nvme_should_reset(dev, csts)) {
K
Keith Busch 已提交
1413
		if (!nvme_reset(dev))
1414
			nvme_warn_reset(dev, csts);
1415
		return;
1416
	}
1417 1418

	mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ));
1419 1420
}

1421
static int nvme_create_io_queues(struct nvme_dev *dev)
K
Keith Busch 已提交
1422
{
1423
	unsigned i, max;
1424
	int ret = 0;
K
Keith Busch 已提交
1425

1426
	for (i = dev->queue_count; i <= dev->max_qid; i++) {
1427 1428 1429
		/* 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))) {
1430
			ret = -ENOMEM;
K
Keith Busch 已提交
1431
			break;
1432 1433
		}
	}
K
Keith Busch 已提交
1434

1435 1436
	max = min(dev->max_qid, dev->queue_count - 1);
	for (i = dev->online_queues; i <= max; i++) {
1437
		ret = nvme_create_queue(dev->queues[i], i);
K
Keith Busch 已提交
1438
		if (ret)
K
Keith Busch 已提交
1439
			break;
M
Matthew Wilcox 已提交
1440
	}
1441 1442 1443 1444 1445 1446 1447 1448

	/*
	 * 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
1449 1450
}

1451 1452 1453 1454 1455 1456
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));

1457
	return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz  : x%08x\n",
1458 1459 1460 1461
		       ndev->cmbloc, ndev->cmbsz);
}
static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL);

1462 1463 1464 1465 1466 1467 1468 1469
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;

1470
	dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ);
1471 1472
	if (!(NVME_CMB_SZ(dev->cmbsz)))
		return NULL;
1473
	dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC);
1474

1475 1476
	if (!use_cmb_sqes)
		return NULL;
1477 1478 1479

	szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz));
	size = szu * NVME_CMB_SZ(dev->cmbsz);
1480 1481
	offset = szu * NVME_CMB_OFST(dev->cmbloc);
	bar_size = pci_resource_len(pdev, NVME_CMB_BIR(dev->cmbloc));
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493

	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;

1494
	dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(dev->cmbloc)) + offset;
1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508
	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;
1509 1510 1511 1512 1513
		if (dev->cmbsz) {
			sysfs_remove_file_from_group(&dev->ctrl.device->kobj,
						     &dev_attr_cmb.attr, NULL);
			dev->cmbsz = 0;
		}
1514 1515 1516
	}
}

K
Keith Busch 已提交
1517 1518
static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
{
1519
	return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride);
K
Keith Busch 已提交
1520 1521
}

1522
static int nvme_setup_io_queues(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1523
{
M
Matias Bjørling 已提交
1524
	struct nvme_queue *adminq = dev->queues[0];
1525
	struct pci_dev *pdev = to_pci_dev(dev->dev);
1526
	int result, nr_io_queues, size;
M
Matthew Wilcox 已提交
1527

1528
	nr_io_queues = num_online_cpus();
C
Christoph Hellwig 已提交
1529 1530
	result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues);
	if (result < 0)
M
Matthew Wilcox 已提交
1531
		return result;
C
Christoph Hellwig 已提交
1532

1533
	if (nr_io_queues == 0)
1534
		return 0;
M
Matthew Wilcox 已提交
1535

1536 1537 1538 1539 1540 1541 1542 1543 1544
	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);
	}

K
Keith Busch 已提交
1545 1546
	size = db_bar_size(dev, nr_io_queues);
	if (size > 8192) {
1547
		iounmap(dev->bar);
K
Keith Busch 已提交
1548 1549 1550 1551 1552 1553 1554 1555
		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);
1556
		dev->dbs = dev->bar + 4096;
1557
		adminq->q_db = dev->dbs;
1558 1559
	}

K
Keith Busch 已提交
1560
	/* Deregister the admin queue's interrupt */
1561
	pci_free_irq(pdev, 0, adminq);
K
Keith Busch 已提交
1562

1563 1564 1565 1566
	/*
	 * If we enable msix early due to not intx, disable it again before
	 * setting up the full range we need.
	 */
1567 1568 1569 1570 1571 1572
	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
1573

1574 1575 1576 1577 1578 1579 1580
	/*
	 * 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.
	 */

1581
	result = queue_request_irq(adminq);
1582 1583
	if (result) {
		adminq->cq_vector = -1;
K
Keith Busch 已提交
1584
		return result;
1585
	}
1586
	return nvme_create_io_queues(dev);
M
Matthew Wilcox 已提交
1587 1588
}

K
Keith Busch 已提交
1589
static void nvme_del_queue_end(struct request *req, int error)
K
Keith Busch 已提交
1590
{
K
Keith Busch 已提交
1591
	struct nvme_queue *nvmeq = req->end_io_data;
1592

K
Keith Busch 已提交
1593 1594
	blk_mq_free_request(req);
	complete(&nvmeq->dev->ioq_wait);
K
Keith Busch 已提交
1595 1596
}

K
Keith Busch 已提交
1597
static void nvme_del_cq_end(struct request *req, int error)
K
Keith Busch 已提交
1598
{
K
Keith Busch 已提交
1599
	struct nvme_queue *nvmeq = req->end_io_data;
K
Keith Busch 已提交
1600

K
Keith Busch 已提交
1601 1602 1603
	if (!error) {
		unsigned long flags;

1604 1605 1606 1607 1608 1609 1610
		/*
		 * 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
1611 1612
		nvme_process_cq(nvmeq);
		spin_unlock_irqrestore(&nvmeq->q_lock, flags);
K
Keith Busch 已提交
1613
	}
K
Keith Busch 已提交
1614 1615

	nvme_del_queue_end(req, error);
K
Keith Busch 已提交
1616 1617
}

K
Keith Busch 已提交
1618
static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode)
1619
{
K
Keith Busch 已提交
1620 1621 1622
	struct request_queue *q = nvmeq->dev->ctrl.admin_q;
	struct request *req;
	struct nvme_command cmd;
1623

K
Keith Busch 已提交
1624 1625 1626
	memset(&cmd, 0, sizeof(cmd));
	cmd.delete_queue.opcode = opcode;
	cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid);
1627

1628
	req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
K
Keith Busch 已提交
1629 1630
	if (IS_ERR(req))
		return PTR_ERR(req);
1631

K
Keith Busch 已提交
1632 1633 1634 1635 1636 1637 1638
	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;
1639 1640
}

1641
static void nvme_disable_io_queues(struct nvme_dev *dev, int queues)
K
Keith Busch 已提交
1642
{
1643
	int pass;
K
Keith Busch 已提交
1644 1645
	unsigned long timeout;
	u8 opcode = nvme_admin_delete_sq;
K
Keith Busch 已提交
1646

K
Keith Busch 已提交
1647
	for (pass = 0; pass < 2; pass++) {
K
Keith Busch 已提交
1648
		int sent = 0, i = queues;
K
Keith Busch 已提交
1649 1650 1651 1652

		reinit_completion(&dev->ioq_wait);
 retry:
		timeout = ADMIN_TIMEOUT;
1653 1654
		for (; i > 0; i--, sent++)
			if (nvme_delete_queue(dev->queues[i], opcode))
K
Keith Busch 已提交
1655
				break;
1656

K
Keith Busch 已提交
1657 1658 1659 1660 1661 1662 1663 1664 1665
		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
1666 1667
}

1668 1669 1670 1671 1672 1673
/*
 * 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.
 */
1674
static int nvme_dev_add(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1675
{
1676
	if (!dev->ctrl.tagset) {
1677 1678 1679 1680 1681
		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
1682
				min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1;
1683 1684 1685
		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
1686

1687 1688
		if (blk_mq_alloc_tag_set(&dev->tagset))
			return 0;
1689
		dev->ctrl.tagset = &dev->tagset;
1690 1691

		nvme_dbbuf_set(dev);
1692 1693 1694 1695 1696
	} 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);
1697
	}
1698

K
Keith Busch 已提交
1699
	return 0;
M
Matthew Wilcox 已提交
1700 1701
}

1702
static int nvme_pci_enable(struct nvme_dev *dev)
1703
{
K
Keith Busch 已提交
1704
	u64 cap;
1705
	int result = -ENOMEM;
1706
	struct pci_dev *pdev = to_pci_dev(dev->dev);
1707 1708 1709 1710 1711 1712

	if (pci_enable_device_mem(pdev))
		return result;

	pci_set_master(pdev);

1713 1714
	if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) &&
	    dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32)))
1715
		goto disable;
1716

1717
	if (readl(dev->bar + NVME_REG_CSTS) == -1) {
K
Keith Busch 已提交
1718
		result = -ENODEV;
1719
		goto disable;
K
Keith Busch 已提交
1720
	}
1721 1722

	/*
1723 1724 1725
	 * 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.
1726
	 */
1727 1728 1729
	result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
	if (result < 0)
		return result;
1730

1731 1732
	cap = lo_hi_readq(dev->bar + NVME_REG_CAP);

K
Keith Busch 已提交
1733 1734
	dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH);
	dev->db_stride = 1 << NVME_CAP_STRIDE(cap);
1735
	dev->dbs = dev->bar + 4096;
1736 1737 1738 1739 1740 1741 1742

	/*
	 * 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;
1743 1744
		dev_warn(dev->ctrl.device, "detected Apple NVMe controller, "
			"set queue depth=%u to work around controller resets\n",
1745 1746 1747
			dev->q_depth);
	}

1748 1749 1750 1751 1752 1753 1754 1755
	/*
	 * CMBs can currently only exist on >=1.2 PCIe devices. We only
	 * populate sysfs if a CMB is implemented. Note that we add the
	 * CMB attribute to the nvme_ctrl kobj which removes the need to remove
	 * it on exit. Since nvme_dev_attrs_group has no name we can pass
	 * NULL as final argument to sysfs_add_file_to_group.
	 */

1756
	if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2, 0)) {
1757
		dev->cmb = nvme_map_cmb(dev);
1758

1759 1760 1761
		if (dev->cmbsz) {
			if (sysfs_add_file_to_group(&dev->ctrl.device->kobj,
						    &dev_attr_cmb.attr, NULL))
1762
				dev_warn(dev->ctrl.device,
1763 1764 1765 1766
					 "failed to add sysfs attribute for CMB\n");
		}
	}

K
Keith Busch 已提交
1767 1768
	pci_enable_pcie_error_reporting(pdev);
	pci_save_state(pdev);
1769 1770 1771 1772 1773 1774 1775 1776
	return 0;

 disable:
	pci_disable_device(pdev);
	return result;
}

static void nvme_dev_unmap(struct nvme_dev *dev)
1777 1778 1779
{
	if (dev->bar)
		iounmap(dev->bar);
1780
	pci_release_mem_regions(to_pci_dev(dev->dev));
1781 1782 1783
}

static void nvme_pci_disable(struct nvme_dev *dev)
1784
{
1785 1786
	struct pci_dev *pdev = to_pci_dev(dev->dev);

1787
	nvme_release_cmb(dev);
1788
	pci_free_irq_vectors(pdev);
1789

K
Keith Busch 已提交
1790 1791
	if (pci_is_enabled(pdev)) {
		pci_disable_pcie_error_reporting(pdev);
1792
		pci_disable_device(pdev);
K
Keith Busch 已提交
1793 1794 1795
	}
}

1796
static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown)
M
Matthew Wilcox 已提交
1797
{
1798
	int i, queues;
K
Keith Busch 已提交
1799 1800
	bool dead = true;
	struct pci_dev *pdev = to_pci_dev(dev->dev);
1801

1802
	del_timer_sync(&dev->watchdog_timer);
1803

1804
	mutex_lock(&dev->shutdown_lock);
K
Keith Busch 已提交
1805 1806 1807 1808 1809 1810 1811
	if (pci_is_enabled(pdev)) {
		u32 csts = readl(dev->bar + NVME_REG_CSTS);

		if (dev->ctrl.state == NVME_CTRL_LIVE)
			nvme_start_freeze(&dev->ctrl);
		dead = !!((csts & NVME_CSTS_CFS) || !(csts & NVME_CSTS_RDY) ||
			pdev->error_state  != pci_channel_io_normal);
1812
	}
1813

K
Keith Busch 已提交
1814 1815 1816 1817 1818 1819 1820 1821
	/*
	 * Give the controller a chance to complete all entered requests if
	 * doing a safe shutdown.
	 */
	if (!dead && shutdown)
		nvme_wait_freeze_timeout(&dev->ctrl, NVME_IO_TIMEOUT);
	nvme_stop_queues(&dev->ctrl);

1822
	queues = dev->online_queues - 1;
1823 1824 1825
	for (i = dev->queue_count - 1; i > 0; i--)
		nvme_suspend_queue(dev->queues[i]);

K
Keith Busch 已提交
1826
	if (dead) {
1827 1828 1829 1830 1831 1832
		/* A device might become IO incapable very soon during
		 * probe, before the admin queue is configured. Thus,
		 * queue_count can be 0 here.
		 */
		if (dev->queue_count)
			nvme_suspend_queue(dev->queues[0]);
K
Keith Busch 已提交
1833
	} else {
1834
		nvme_disable_io_queues(dev, queues);
1835
		nvme_disable_admin_queue(dev, shutdown);
K
Keith Busch 已提交
1836
	}
1837
	nvme_pci_disable(dev);
1838

1839 1840
	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
1841 1842 1843 1844 1845 1846 1847 1848

	/*
	 * 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);
1849
	mutex_unlock(&dev->shutdown_lock);
M
Matthew Wilcox 已提交
1850 1851
}

M
Matthew Wilcox 已提交
1852 1853
static int nvme_setup_prp_pools(struct nvme_dev *dev)
{
1854
	dev->prp_page_pool = dma_pool_create("prp list page", dev->dev,
M
Matthew Wilcox 已提交
1855 1856 1857 1858
						PAGE_SIZE, PAGE_SIZE, 0);
	if (!dev->prp_page_pool)
		return -ENOMEM;

1859
	/* Optimisation for I/Os between 4k and 128k */
1860
	dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev,
1861 1862 1863 1864 1865
						256, 256, 0);
	if (!dev->prp_small_pool) {
		dma_pool_destroy(dev->prp_page_pool);
		return -ENOMEM;
	}
M
Matthew Wilcox 已提交
1866 1867 1868 1869 1870 1871
	return 0;
}

static void nvme_release_prp_pools(struct nvme_dev *dev)
{
	dma_pool_destroy(dev->prp_page_pool);
1872
	dma_pool_destroy(dev->prp_small_pool);
M
Matthew Wilcox 已提交
1873 1874
}

1875
static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
1876
{
1877
	struct nvme_dev *dev = to_nvme_dev(ctrl);
1878

1879
	nvme_dbbuf_dma_free(dev);
1880
	put_device(dev->dev);
1881 1882
	if (dev->tagset.tags)
		blk_mq_free_tag_set(&dev->tagset);
1883 1884
	if (dev->ctrl.admin_q)
		blk_put_queue(dev->ctrl.admin_q);
1885
	kfree(dev->queues);
1886
	free_opal_dev(dev->ctrl.opal_dev);
1887 1888 1889
	kfree(dev);
}

1890 1891
static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status)
{
1892
	dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status);
1893 1894

	kref_get(&dev->ctrl.kref);
1895
	nvme_dev_disable(dev, false);
1896 1897 1898 1899
	if (!schedule_work(&dev->remove_work))
		nvme_put_ctrl(&dev->ctrl);
}

1900
static void nvme_reset_work(struct work_struct *work)
1901
{
1902
	struct nvme_dev *dev = container_of(work, struct nvme_dev, reset_work);
1903
	bool was_suspend = !!(dev->ctrl.ctrl_config & NVME_CC_SHN_NORMAL);
1904
	int result = -ENODEV;
1905

1906
	if (WARN_ON(dev->ctrl.state == NVME_CTRL_RESETTING))
1907
		goto out;
1908

1909 1910 1911 1912
	/*
	 * If we're called to reset a live controller first shut it down before
	 * moving on.
	 */
1913
	if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
1914
		nvme_dev_disable(dev, false);
1915

1916
	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RESETTING))
K
Keith Busch 已提交
1917 1918
		goto out;

1919
	result = nvme_pci_enable(dev);
1920
	if (result)
1921
		goto out;
1922 1923 1924

	result = nvme_configure_admin_queue(dev);
	if (result)
1925
		goto out;
1926

M
Matias Bjørling 已提交
1927
	nvme_init_queue(dev->queues[0], 0);
K
Keith Busch 已提交
1928 1929
	result = nvme_alloc_admin_tags(dev);
	if (result)
1930
		goto out;
1931

1932 1933
	result = nvme_init_identify(&dev->ctrl);
	if (result)
1934
		goto out;
1935

1936 1937 1938 1939 1940 1941 1942 1943 1944
	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;
1945
	}
1946

1947 1948 1949 1950 1951 1952 1953
	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");
	}

1954
	result = nvme_setup_io_queues(dev);
1955
	if (result)
1956
		goto out;
1957

1958 1959 1960 1961 1962 1963
	/*
	 * A controller that can not execute IO typically requires user
	 * intervention to correct. For such degraded controllers, the driver
	 * should not submit commands the user did not request, so skip
	 * registering for asynchronous event notification on this condition.
	 */
1964 1965
	if (dev->online_queues > 1)
		nvme_queue_async_events(&dev->ctrl);
1966

1967
	mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + HZ));
1968

1969 1970 1971 1972
	/*
	 * Keep the controller around but remove all namespaces if we don't have
	 * any working I/O queue.
	 */
1973
	if (dev->online_queues < 2) {
1974
		dev_warn(dev->ctrl.device, "IO queues not created\n");
1975
		nvme_kill_queues(&dev->ctrl);
1976
		nvme_remove_namespaces(&dev->ctrl);
1977
	} else {
1978
		nvme_start_queues(&dev->ctrl);
K
Keith Busch 已提交
1979
		nvme_wait_freeze(&dev->ctrl);
1980
		nvme_dev_add(dev);
K
Keith Busch 已提交
1981
		nvme_unfreeze(&dev->ctrl);
1982 1983
	}

1984 1985 1986 1987
	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_LIVE)) {
		dev_warn(dev->ctrl.device, "failed to mark controller live\n");
		goto out;
	}
1988 1989

	if (dev->online_queues > 1)
1990
		nvme_queue_scan(&dev->ctrl);
1991
	return;
1992

1993
 out:
1994
	nvme_remove_dead_ctrl(dev, result);
1995 1996
}

1997
static void nvme_remove_dead_ctrl_work(struct work_struct *work)
K
Keith Busch 已提交
1998
{
1999
	struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work);
2000
	struct pci_dev *pdev = to_pci_dev(dev->dev);
K
Keith Busch 已提交
2001

2002
	nvme_kill_queues(&dev->ctrl);
K
Keith Busch 已提交
2003
	if (pci_get_drvdata(pdev))
K
Keith Busch 已提交
2004
		device_release_driver(&pdev->dev);
2005
	nvme_put_ctrl(&dev->ctrl);
K
Keith Busch 已提交
2006 2007
}

2008
static int nvme_reset(struct nvme_dev *dev)
K
Keith Busch 已提交
2009
{
2010
	if (!dev->ctrl.admin_q || blk_queue_dying(dev->ctrl.admin_q))
2011
		return -ENODEV;
K
Keith Busch 已提交
2012 2013
	if (work_busy(&dev->reset_work))
		return -ENODEV;
C
Christoph Hellwig 已提交
2014 2015 2016
	if (!queue_work(nvme_workq, &dev->reset_work))
		return -EBUSY;
	return 0;
K
Keith Busch 已提交
2017 2018
}

2019
static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
T
Tejun Heo 已提交
2020
{
2021
	*val = readl(to_nvme_dev(ctrl)->bar + off);
2022
	return 0;
T
Tejun Heo 已提交
2023 2024
}

2025
static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
2026
{
2027 2028 2029
	writel(val, to_nvme_dev(ctrl)->bar + off);
	return 0;
}
2030

2031 2032 2033 2034
static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
{
	*val = readq(to_nvme_dev(ctrl)->bar + off);
	return 0;
2035 2036
}

2037 2038
static int nvme_pci_reset_ctrl(struct nvme_ctrl *ctrl)
{
K
Keith Busch 已提交
2039 2040 2041 2042 2043 2044
	struct nvme_dev *dev = to_nvme_dev(ctrl);
	int ret = nvme_reset(dev);

	if (!ret)
		flush_work(&dev->reset_work);
	return ret;
2045
}
2046

2047
static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
M
Ming Lin 已提交
2048
	.name			= "pcie",
2049
	.module			= THIS_MODULE,
2050
	.flags			= NVME_F_METADATA_SUPPORTED,
2051
	.reg_read32		= nvme_pci_reg_read32,
2052
	.reg_write32		= nvme_pci_reg_write32,
2053
	.reg_read64		= nvme_pci_reg_read64,
2054
	.reset_ctrl		= nvme_pci_reset_ctrl,
2055
	.free_ctrl		= nvme_pci_free_ctrl,
2056
	.submit_async_event	= nvme_pci_submit_async_event,
2057
};
2058

2059 2060 2061 2062
static int nvme_dev_map(struct nvme_dev *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev->dev);

2063
	if (pci_request_mem_regions(pdev, "nvme"))
2064 2065 2066 2067 2068 2069
		return -ENODEV;

	dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);
	if (!dev->bar)
		goto release;

M
Max Gurtovoy 已提交
2070
	return 0;
2071
  release:
M
Max Gurtovoy 已提交
2072 2073
	pci_release_mem_regions(pdev);
	return -ENODEV;
2074 2075
}

2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
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;
}

2096
static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
M
Matthew Wilcox 已提交
2097
{
M
Matias Bjørling 已提交
2098
	int node, result = -ENOMEM;
M
Matthew Wilcox 已提交
2099
	struct nvme_dev *dev;
2100
	unsigned long quirks = id->driver_data;
M
Matthew Wilcox 已提交
2101

M
Matias Bjørling 已提交
2102 2103
	node = dev_to_node(&pdev->dev);
	if (node == NUMA_NO_NODE)
2104
		set_dev_node(&pdev->dev, first_memory_node);
M
Matias Bjørling 已提交
2105 2106

	dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node);
M
Matthew Wilcox 已提交
2107 2108
	if (!dev)
		return -ENOMEM;
M
Matias Bjørling 已提交
2109 2110
	dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *),
							GFP_KERNEL, node);
M
Matthew Wilcox 已提交
2111 2112 2113
	if (!dev->queues)
		goto free;

2114
	dev->dev = get_device(&pdev->dev);
K
Keith Busch 已提交
2115
	pci_set_drvdata(pdev, dev);
2116

2117 2118 2119 2120
	result = nvme_dev_map(dev);
	if (result)
		goto free;

2121
	INIT_WORK(&dev->reset_work, nvme_reset_work);
2122
	INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
2123 2124
	setup_timer(&dev->watchdog_timer, nvme_watchdog_timer,
		(unsigned long)dev);
2125
	mutex_init(&dev->shutdown_lock);
K
Keith Busch 已提交
2126
	init_completion(&dev->ioq_wait);
M
Matthew Wilcox 已提交
2127

M
Matthew Wilcox 已提交
2128 2129
	result = nvme_setup_prp_pools(dev);
	if (result)
K
Keith Busch 已提交
2130
		goto put_pci;
2131

2132 2133
	quirks |= check_dell_samsung_bug(pdev);

2134
	result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops,
2135
			quirks);
2136
	if (result)
2137
		goto release_pools;
2138

2139 2140
	dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));

2141
	queue_work(nvme_workq, &dev->reset_work);
M
Matthew Wilcox 已提交
2142 2143
	return 0;

2144
 release_pools:
M
Matthew Wilcox 已提交
2145
	nvme_release_prp_pools(dev);
K
Keith Busch 已提交
2146
 put_pci:
2147
	put_device(dev->dev);
2148
	nvme_dev_unmap(dev);
M
Matthew Wilcox 已提交
2149 2150 2151 2152 2153 2154
 free:
	kfree(dev->queues);
	kfree(dev);
	return result;
}

2155 2156
static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)
{
K
Keith Busch 已提交
2157
	struct nvme_dev *dev = pci_get_drvdata(pdev);
2158

K
Keith Busch 已提交
2159
	if (prepare)
2160
		nvme_dev_disable(dev, false);
K
Keith Busch 已提交
2161
	else
K
Keith Busch 已提交
2162
		nvme_reset(dev);
2163 2164
}

2165 2166 2167
static void nvme_shutdown(struct pci_dev *pdev)
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);
2168
	nvme_dev_disable(dev, true);
2169 2170
}

2171 2172 2173 2174 2175
/*
 * 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.
 */
2176
static void nvme_remove(struct pci_dev *pdev)
M
Matthew Wilcox 已提交
2177 2178
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);
K
Keith Busch 已提交
2179

2180 2181
	nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING);

K
Keith Busch 已提交
2182
	pci_set_drvdata(pdev, NULL);
2183

2184
	if (!pci_device_is_present(pdev)) {
2185
		nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD);
2186 2187
		nvme_dev_disable(dev, false);
	}
2188

K
Keith Busch 已提交
2189
	flush_work(&dev->reset_work);
2190
	nvme_uninit_ctrl(&dev->ctrl);
2191
	nvme_dev_disable(dev, true);
M
Matias Bjørling 已提交
2192
	nvme_dev_remove_admin(dev);
2193
	nvme_free_queues(dev, 0);
K
Keith Busch 已提交
2194
	nvme_release_prp_pools(dev);
2195
	nvme_dev_unmap(dev);
2196
	nvme_put_ctrl(&dev->ctrl);
M
Matthew Wilcox 已提交
2197 2198
}

K
Keith Busch 已提交
2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216
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;
}

2217
#ifdef CONFIG_PM_SLEEP
2218 2219 2220 2221 2222
static int nvme_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct nvme_dev *ndev = pci_get_drvdata(pdev);

2223
	nvme_dev_disable(ndev, true);
2224 2225 2226 2227 2228 2229 2230 2231
	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);

K
Keith Busch 已提交
2232
	nvme_reset(ndev);
K
Keith Busch 已提交
2233
	return 0;
2234
}
2235
#endif
2236 2237

static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
M
Matthew Wilcox 已提交
2238

K
Keith Busch 已提交
2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252
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
2253 2254
		dev_warn(dev->ctrl.device,
			"frozen state error detected, reset controller\n");
2255
		nvme_dev_disable(dev, false);
K
Keith Busch 已提交
2256 2257
		return PCI_ERS_RESULT_NEED_RESET;
	case pci_channel_io_perm_failure:
K
Keith Busch 已提交
2258 2259
		dev_warn(dev->ctrl.device,
			"failure state error detected, request disconnect\n");
K
Keith Busch 已提交
2260 2261 2262 2263 2264 2265 2266 2267 2268
		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);

2269
	dev_info(dev->ctrl.device, "restart after slot reset\n");
K
Keith Busch 已提交
2270
	pci_restore_state(pdev);
K
Keith Busch 已提交
2271
	nvme_reset(dev);
K
Keith Busch 已提交
2272 2273 2274 2275 2276 2277 2278 2279
	return PCI_ERS_RESULT_RECOVERED;
}

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

2280
static const struct pci_error_handlers nvme_err_handler = {
M
Matthew Wilcox 已提交
2281 2282 2283
	.error_detected	= nvme_error_detected,
	.slot_reset	= nvme_slot_reset,
	.resume		= nvme_error_resume,
2284
	.reset_notify	= nvme_reset_notify,
M
Matthew Wilcox 已提交
2285 2286
};

2287
static const struct pci_device_id nvme_id_table[] = {
2288
	{ PCI_VDEVICE(INTEL, 0x0953),
2289
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2290
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2291 2292
	{ PCI_VDEVICE(INTEL, 0x0a53),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2293
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2294 2295
	{ PCI_VDEVICE(INTEL, 0x0a54),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2296
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2297 2298
	{ PCI_VDEVICE(INTEL, 0xf1a5),	/* Intel 600P/P3100 */
		.driver_data = NVME_QUIRK_NO_DEEPEST_PS },
2299 2300
	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */
		.driver_data = NVME_QUIRK_IDENTIFY_CNS, },
2301 2302
	{ PCI_DEVICE(0x1c58, 0x0003),	/* HGST adapter */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
2303 2304
	{ PCI_DEVICE(0x1c5f, 0x0540),	/* Memblaze Pblaze4 adapter */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
M
Matthew Wilcox 已提交
2305
	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
2306
	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) },
2307
	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },
M
Matthew Wilcox 已提交
2308 2309 2310 2311 2312 2313 2314 2315
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, nvme_id_table);

static struct pci_driver nvme_driver = {
	.name		= "nvme",
	.id_table	= nvme_id_table,
	.probe		= nvme_probe,
2316
	.remove		= nvme_remove,
2317
	.shutdown	= nvme_shutdown,
2318 2319 2320
	.driver		= {
		.pm	= &nvme_dev_pm_ops,
	},
K
Keith Busch 已提交
2321
	.sriov_configure = nvme_pci_sriov_configure,
M
Matthew Wilcox 已提交
2322 2323 2324 2325 2326
	.err_handler	= &nvme_err_handler,
};

static int __init nvme_init(void)
{
2327
	int result;
2328

2329
	nvme_workq = alloc_workqueue("nvme", WQ_UNBOUND | WQ_MEM_RECLAIM, 0);
K
Keith Busch 已提交
2330
	if (!nvme_workq)
2331
		return -ENOMEM;
K
Keith Busch 已提交
2332

2333 2334
	result = pci_register_driver(&nvme_driver);
	if (result)
2335
		destroy_workqueue(nvme_workq);
M
Matthew Wilcox 已提交
2336 2337 2338 2339 2340 2341
	return result;
}

static void __exit nvme_exit(void)
{
	pci_unregister_driver(&nvme_driver);
K
Keith Busch 已提交
2342
	destroy_workqueue(nvme_workq);
2343
	_nvme_check_size();
M
Matthew Wilcox 已提交
2344 2345 2346 2347
}

MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
MODULE_LICENSE("GPL");
2348
MODULE_VERSION("1.0");
M
Matthew Wilcox 已提交
2349 2350
module_init(nvme_init);
module_exit(nvme_exit);