pci.c 68.5 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/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/once.h>
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#include <linux/pci.h>
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#include <linux/t10-pi.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 <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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#define SGES_PER_PAGE	(PAGE_SIZE / sizeof(struct nvme_sgl_desc))
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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 unsigned int sgl_threshold = SZ_32K;
module_param(sgl_threshold, uint, 0644);
MODULE_PARM_DESC(sgl_threshold,
		"Use SGLs when average request segment size is larger or equal to "
		"this size. Use 0 to disable SGLs.");

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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 {
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	struct nvme_queue *queues;
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	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;
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	pci_bus_addr_t cmb_bus_addr;
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	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;
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	dma_addr_t host_mem_descs_dma;
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	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;
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	bool use_sgl;
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	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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/*
 * Calculates the number of pages needed for the SGL segments. For example a 4k
 * page can accommodate 256 SGL descriptors.
 */
static int nvme_pci_npages_sgl(unsigned int num_seg)
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{
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	return DIV_ROUND_UP(num_seg * sizeof(struct nvme_sgl_desc), PAGE_SIZE);
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}
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static unsigned int nvme_pci_iod_alloc_size(struct nvme_dev *dev,
		unsigned int size, unsigned int nseg, bool use_sgl)
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{
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	size_t alloc_size;

	if (use_sgl)
		alloc_size = sizeof(__le64 *) * nvme_pci_npages_sgl(nseg);
	else
		alloc_size = sizeof(__le64 *) * nvme_npages(size, dev);

	return alloc_size + sizeof(struct scatterlist) * nseg;
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}
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static unsigned int nvme_pci_cmd_size(struct nvme_dev *dev, bool use_sgl)
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{
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	unsigned int alloc_size = nvme_pci_iod_alloc_size(dev,
				    NVME_INT_BYTES(dev), NVME_INT_PAGES,
				    use_sgl);

	return sizeof(struct nvme_iod) + alloc_size;
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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;
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	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;
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	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 void **nvme_pci_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 (void **)(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)) {
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		size_t alloc_size = nvme_pci_iod_alloc_size(dev, size, nseg,
				iod->use_sgl);

		iod->sg = kmalloc(alloc_size, GFP_ATOMIC);
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		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 / sizeof(__le64) - 1;
	dma_addr_t dma_addr = iod->first_dma, next_dma_addr;

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	int i;

	if (iod->npages == 0)
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		dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0],
			dma_addr);

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	for (i = 0; i < iod->npages; i++) {
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		void *addr = nvme_pci_iod_list(req)[i];

		if (iod->use_sgl) {
			struct nvme_sgl_desc *sg_list = addr;

			next_dma_addr =
			    le64_to_cpu((sg_list[SGES_PER_PAGE - 1]).addr);
		} else {
			__le64 *prp_list = addr;

			next_dma_addr = le64_to_cpu(prp_list[last_prp]);
		}

		dma_pool_free(dev->prp_page_pool, addr, dma_addr);
		dma_addr = next_dma_addr;
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	}
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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);
555
	ts = ns->disk->queue->integrity.tuple_size;
K
Keith Busch 已提交
556 557 558 559 560 561 562 563

	for (i = 0; i < nlb; i++, virt++, phys++) {
		pi = (struct t10_pi_tuple *)p;
		dif_swap(phys, virt, pi);
		p += ts;
	}
	kunmap_atomic(pmap);
}
564 565 566 567 568 569 570 571 572 573 574 575 576
#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

577 578 579 580 581 582 583 584 585 586 587 588 589 590
static void nvme_print_sgl(struct scatterlist *sgl, int nents)
{
	int i;
	struct scatterlist *sg;

	for_each_sg(sgl, sg, 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));
	}
}

C
Chaitanya Kulkarni 已提交
591 592
static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev,
		struct request *req, struct nvme_rw_command *cmnd)
M
Matthew Wilcox 已提交
593
{
C
Christoph Hellwig 已提交
594
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
595
	struct dma_pool *pool;
596
	int length = blk_rq_payload_bytes(req);
597
	struct scatterlist *sg = iod->sg;
M
Matthew Wilcox 已提交
598 599
	int dma_len = sg_dma_len(sg);
	u64 dma_addr = sg_dma_address(sg);
600
	u32 page_size = dev->ctrl.page_size;
601
	int offset = dma_addr & (page_size - 1);
602
	__le64 *prp_list;
C
Chaitanya Kulkarni 已提交
603
	void **list = nvme_pci_iod_list(req);
604
	dma_addr_t prp_dma;
605
	int nprps, i;
M
Matthew Wilcox 已提交
606

C
Chaitanya Kulkarni 已提交
607 608
	iod->use_sgl = false;

609
	length -= (page_size - offset);
610 611
	if (length <= 0) {
		iod->first_dma = 0;
C
Chaitanya Kulkarni 已提交
612
		goto done;
613
	}
M
Matthew Wilcox 已提交
614

615
	dma_len -= (page_size - offset);
M
Matthew Wilcox 已提交
616
	if (dma_len) {
617
		dma_addr += (page_size - offset);
M
Matthew Wilcox 已提交
618 619 620 621 622 623
	} else {
		sg = sg_next(sg);
		dma_addr = sg_dma_address(sg);
		dma_len = sg_dma_len(sg);
	}

624
	if (length <= page_size) {
625
		iod->first_dma = dma_addr;
C
Chaitanya Kulkarni 已提交
626
		goto done;
627 628
	}

629
	nprps = DIV_ROUND_UP(length, page_size);
630 631
	if (nprps <= (256 / 8)) {
		pool = dev->prp_small_pool;
632
		iod->npages = 0;
633 634
	} else {
		pool = dev->prp_page_pool;
635
		iod->npages = 1;
636 637
	}

638
	prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
639
	if (!prp_list) {
640
		iod->first_dma = dma_addr;
641
		iod->npages = -1;
642
		return BLK_STS_RESOURCE;
643
	}
644 645
	list[0] = prp_list;
	iod->first_dma = prp_dma;
646 647
	i = 0;
	for (;;) {
648
		if (i == page_size >> 3) {
649
			__le64 *old_prp_list = prp_list;
650
			prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
651
			if (!prp_list)
652
				return BLK_STS_RESOURCE;
653
			list[iod->npages++] = prp_list;
654 655 656
			prp_list[0] = old_prp_list[i - 1];
			old_prp_list[i - 1] = cpu_to_le64(prp_dma);
			i = 1;
657 658
		}
		prp_list[i++] = cpu_to_le64(dma_addr);
659 660 661
		dma_len -= page_size;
		dma_addr += page_size;
		length -= page_size;
662 663 664 665
		if (length <= 0)
			break;
		if (dma_len > 0)
			continue;
666 667
		if (unlikely(dma_len < 0))
			goto bad_sgl;
668 669 670
		sg = sg_next(sg);
		dma_addr = sg_dma_address(sg);
		dma_len = sg_dma_len(sg);
M
Matthew Wilcox 已提交
671 672
	}

C
Chaitanya Kulkarni 已提交
673 674 675 676
done:
	cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
	cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma);

677 678 679
	return BLK_STS_OK;

 bad_sgl:
680 681 682
	WARN(DO_ONCE(nvme_print_sgl, iod->sg, iod->nents),
			"Invalid SGL for payload:%d nents:%d\n",
			blk_rq_payload_bytes(req), iod->nents);
683
	return BLK_STS_IOERR;
M
Matthew Wilcox 已提交
684 685
}

C
Chaitanya Kulkarni 已提交
686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789
static void nvme_pci_sgl_set_data(struct nvme_sgl_desc *sge,
		struct scatterlist *sg)
{
	sge->addr = cpu_to_le64(sg_dma_address(sg));
	sge->length = cpu_to_le32(sg_dma_len(sg));
	sge->type = NVME_SGL_FMT_DATA_DESC << 4;
}

static void nvme_pci_sgl_set_seg(struct nvme_sgl_desc *sge,
		dma_addr_t dma_addr, int entries)
{
	sge->addr = cpu_to_le64(dma_addr);
	if (entries < SGES_PER_PAGE) {
		sge->length = cpu_to_le32(entries * sizeof(*sge));
		sge->type = NVME_SGL_FMT_LAST_SEG_DESC << 4;
	} else {
		sge->length = cpu_to_le32(PAGE_SIZE);
		sge->type = NVME_SGL_FMT_SEG_DESC << 4;
	}
}

static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev,
		struct request *req, struct nvme_rw_command *cmd)
{
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	int length = blk_rq_payload_bytes(req);
	struct dma_pool *pool;
	struct nvme_sgl_desc *sg_list;
	struct scatterlist *sg = iod->sg;
	int entries = iod->nents, i = 0;
	dma_addr_t sgl_dma;

	iod->use_sgl = true;

	/* setting the transfer type as SGL */
	cmd->flags = NVME_CMD_SGL_METABUF;

	if (length == sg_dma_len(sg)) {
		nvme_pci_sgl_set_data(&cmd->dptr.sgl, sg);
		return BLK_STS_OK;
	}

	if (entries <= (256 / sizeof(struct nvme_sgl_desc))) {
		pool = dev->prp_small_pool;
		iod->npages = 0;
	} else {
		pool = dev->prp_page_pool;
		iod->npages = 1;
	}

	sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma);
	if (!sg_list) {
		iod->npages = -1;
		return BLK_STS_RESOURCE;
	}

	nvme_pci_iod_list(req)[0] = sg_list;
	iod->first_dma = sgl_dma;

	nvme_pci_sgl_set_seg(&cmd->dptr.sgl, sgl_dma, entries);

	do {
		if (i == SGES_PER_PAGE) {
			struct nvme_sgl_desc *old_sg_desc = sg_list;
			struct nvme_sgl_desc *link = &old_sg_desc[i - 1];

			sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma);
			if (!sg_list)
				return BLK_STS_RESOURCE;

			i = 0;
			nvme_pci_iod_list(req)[iod->npages++] = sg_list;
			sg_list[i++] = *link;
			nvme_pci_sgl_set_seg(link, sgl_dma, entries);
		}

		nvme_pci_sgl_set_data(&sg_list[i++], sg);

		length -= sg_dma_len(sg);
		sg = sg_next(sg);
		entries--;
	} while (length > 0);

	WARN_ON(entries > 0);
	return BLK_STS_OK;
}

static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req)
{
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	unsigned int avg_seg_size;

	avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req),
			blk_rq_nr_phys_segments(req));

	if (!(dev->ctrl.sgls & ((1 << 0) | (1 << 1))))
		return false;
	if (!iod->nvmeq->qid)
		return false;
	if (!sgl_threshold || avg_seg_size < sgl_threshold)
		return false;
	return true;
}

790
static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,
791
		struct nvme_command *cmnd)
792
{
C
Christoph Hellwig 已提交
793
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
C
Christoph Hellwig 已提交
794 795 796
	struct request_queue *q = req->q;
	enum dma_data_direction dma_dir = rq_data_dir(req) ?
			DMA_TO_DEVICE : DMA_FROM_DEVICE;
797
	blk_status_t ret = BLK_STS_IOERR;
798

799
	sg_init_table(iod->sg, blk_rq_nr_phys_segments(req));
C
Christoph Hellwig 已提交
800 801 802
	iod->nents = blk_rq_map_sg(q, req, iod->sg);
	if (!iod->nents)
		goto out;
803

804
	ret = BLK_STS_RESOURCE;
805 806
	if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir,
				DMA_ATTR_NO_WARN))
C
Christoph Hellwig 已提交
807
		goto out;
808

C
Chaitanya Kulkarni 已提交
809 810 811 812 813
	if (nvme_pci_use_sgls(dev, req))
		ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw);
	else
		ret = nvme_pci_setup_prps(dev, req, &cmnd->rw);

814
	if (ret != BLK_STS_OK)
C
Christoph Hellwig 已提交
815
		goto out_unmap;
816

817
	ret = BLK_STS_IOERR;
C
Christoph Hellwig 已提交
818 819 820
	if (blk_integrity_rq(req)) {
		if (blk_rq_count_integrity_sg(q, req->bio) != 1)
			goto out_unmap;
821

822 823
		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
824
			goto out_unmap;
825

826
		if (req_op(req) == REQ_OP_WRITE)
C
Christoph Hellwig 已提交
827
			nvme_dif_remap(req, nvme_dif_prep);
828

829
		if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir))
C
Christoph Hellwig 已提交
830
			goto out_unmap;
831
	}
M
Matthew Wilcox 已提交
832

C
Christoph Hellwig 已提交
833
	if (blk_integrity_rq(req))
834
		cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg));
835
	return BLK_STS_OK;
M
Matthew Wilcox 已提交
836

C
Christoph Hellwig 已提交
837 838 839 840
out_unmap:
	dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
out:
	return ret;
M
Matthew Wilcox 已提交
841 842
}

C
Christoph Hellwig 已提交
843
static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
M
Matthew Wilcox 已提交
844
{
C
Christoph Hellwig 已提交
845
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
846 847 848 849 850 851
	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)) {
852
			if (req_op(req) == REQ_OP_READ)
853
				nvme_dif_remap(req, nvme_dif_complete);
854
			dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir);
K
Keith Busch 已提交
855
		}
856
	}
K
Keith Busch 已提交
857

858
	nvme_cleanup_cmd(req);
C
Christoph Hellwig 已提交
859
	nvme_free_iod(dev, req);
860
}
M
Matthew Wilcox 已提交
861

862 863 864
/*
 * NOTE: ns is NULL when called on the admin queue.
 */
865
static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
M
Matias Bjørling 已提交
866
			 const struct blk_mq_queue_data *bd)
867
{
M
Matias Bjørling 已提交
868 869
	struct nvme_ns *ns = hctx->queue->queuedata;
	struct nvme_queue *nvmeq = hctx->driver_data;
870
	struct nvme_dev *dev = nvmeq->dev;
M
Matias Bjørling 已提交
871
	struct request *req = bd->rq;
C
Christoph Hellwig 已提交
872
	struct nvme_command cmnd;
873
	blk_status_t ret;
K
Keith Busch 已提交
874

875
	ret = nvme_setup_cmd(ns, req, &cmnd);
876
	if (ret)
C
Christoph Hellwig 已提交
877
		return ret;
M
Matias Bjørling 已提交
878

879
	ret = nvme_init_iod(req, dev);
880
	if (ret)
881
		goto out_free_cmd;
M
Matias Bjørling 已提交
882

883
	if (blk_rq_nr_phys_segments(req)) {
884
		ret = nvme_map_data(dev, req, &cmnd);
885 886 887
		if (ret)
			goto out_cleanup_iod;
	}
M
Matias Bjørling 已提交
888

889
	blk_mq_start_request(req);
M
Matias Bjørling 已提交
890

C
Christoph Hellwig 已提交
891
	spin_lock_irq(&nvmeq->q_lock);
892
	if (unlikely(nvmeq->cq_vector < 0)) {
893
		ret = BLK_STS_IOERR;
894
		spin_unlock_irq(&nvmeq->q_lock);
895
		goto out_cleanup_iod;
896
	}
C
Christoph Hellwig 已提交
897
	__nvme_submit_cmd(nvmeq, &cmnd);
M
Matias Bjørling 已提交
898 899
	nvme_process_cq(nvmeq);
	spin_unlock_irq(&nvmeq->q_lock);
900
	return BLK_STS_OK;
901
out_cleanup_iod:
C
Christoph Hellwig 已提交
902
	nvme_free_iod(dev, req);
903 904
out_free_cmd:
	nvme_cleanup_cmd(req);
C
Christoph Hellwig 已提交
905
	return ret;
M
Matthew Wilcox 已提交
906
}
K
Keith Busch 已提交
907

908
static void nvme_pci_complete_rq(struct request *req)
909
{
C
Christoph Hellwig 已提交
910
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
M
Matias Bjørling 已提交
911

912 913
	nvme_unmap_data(iod->nvmeq->dev, req);
	nvme_complete_rq(req);
M
Matthew Wilcox 已提交
914 915
}

916 917 918 919 920 921 922
/* 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;
}

923
static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq)
M
Matthew Wilcox 已提交
924
{
925
	u16 head = nvmeq->cq_head;
926

927 928 929 930 931 932
	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);
	}
}
933

934 935 936 937
static inline void nvme_handle_cqe(struct nvme_queue *nvmeq,
		struct nvme_completion *cqe)
{
	struct request *req;
938

939 940 941 942 943
	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
944 945
	}

946 947 948 949 950 951 952
	/*
	 * 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 &&
K
Keith Busch 已提交
953
			cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) {
954 955
		nvme_complete_async_event(&nvmeq->dev->ctrl,
				cqe->status, &cqe->result);
J
Jens Axboe 已提交
956
		return;
957
	}
M
Matthew Wilcox 已提交
958

959
	nvmeq->cqe_seen = 1;
960 961 962
	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
963

964 965
static inline bool nvme_read_cqe(struct nvme_queue *nvmeq,
		struct nvme_completion *cqe)
M
Matthew Wilcox 已提交
966
{
967 968
	if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) {
		*cqe = nvmeq->cqes[nvmeq->cq_head];
969

970 971 972
		if (++nvmeq->cq_head == nvmeq->q_depth) {
			nvmeq->cq_head = 0;
			nvmeq->cq_phase = !nvmeq->cq_phase;
M
Matthew Wilcox 已提交
973
		}
974
		return true;
M
Matthew Wilcox 已提交
975
	}
976
	return false;
J
Jens Axboe 已提交
977 978 979 980
}

static void nvme_process_cq(struct nvme_queue *nvmeq)
{
981 982
	struct nvme_completion cqe;
	int consumed = 0;
M
Matthew Wilcox 已提交
983

984 985 986 987
	while (nvme_read_cqe(nvmeq, &cqe)) {
		nvme_handle_cqe(nvmeq, &cqe);
		consumed++;
	}
988

989
	if (consumed)
990
		nvme_ring_cq_doorbell(nvmeq);
M
Matthew Wilcox 已提交
991 992 993
}

static irqreturn_t nvme_irq(int irq, void *data)
994 995 996 997
{
	irqreturn_t result;
	struct nvme_queue *nvmeq = data;
	spin_lock(&nvmeq->q_lock);
998 999 1000
	nvme_process_cq(nvmeq);
	result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE;
	nvmeq->cqe_seen = 0;
1001 1002 1003 1004 1005 1006 1007
	spin_unlock(&nvmeq->q_lock);
	return result;
}

static irqreturn_t nvme_irq_check(int irq, void *data)
{
	struct nvme_queue *nvmeq = data;
1008 1009 1010
	if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase))
		return IRQ_WAKE_THREAD;
	return IRQ_NONE;
1011 1012
}

K
Keith Busch 已提交
1013
static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag)
J
Jens Axboe 已提交
1014
{
1015 1016
	struct nvme_completion cqe;
	int found = 0, consumed = 0;
J
Jens Axboe 已提交
1017

1018 1019
	if (!nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase))
		return 0;
J
Jens Axboe 已提交
1020

1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036
	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
1037 1038
}

K
Keith Busch 已提交
1039 1040 1041 1042 1043 1044 1045
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);
}

1046
static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl)
M
Matthew Wilcox 已提交
1047
{
1048
	struct nvme_dev *dev = to_nvme_dev(ctrl);
1049
	struct nvme_queue *nvmeq = &dev->queues[0];
M
Matias Bjørling 已提交
1050
	struct nvme_command c;
M
Matthew Wilcox 已提交
1051

M
Matias Bjørling 已提交
1052 1053
	memset(&c, 0, sizeof(c));
	c.common.opcode = nvme_admin_async_event;
1054
	c.common.command_id = NVME_AQ_BLK_MQ_DEPTH;
1055

1056
	spin_lock_irq(&nvmeq->q_lock);
1057
	__nvme_submit_cmd(nvmeq, &c);
1058
	spin_unlock_irq(&nvmeq->q_lock);
1059 1060
}

M
Matthew Wilcox 已提交
1061
static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
1062
{
M
Matthew Wilcox 已提交
1063 1064 1065 1066 1067 1068
	struct nvme_command c;

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

1069
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
1070 1071 1072 1073 1074 1075 1076 1077
}

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;

1078
	/*
M
Minwoo Im 已提交
1079
	 * Note: we (ab)use the fact that the prp fields survive if no data
1080 1081
	 * is attached to the request.
	 */
M
Matthew Wilcox 已提交
1082 1083 1084 1085 1086 1087 1088 1089
	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);

1090
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
1091 1092 1093 1094 1095 1096
}

static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
						struct nvme_queue *nvmeq)
{
	struct nvme_command c;
1097
	int flags = NVME_QUEUE_PHYS_CONTIG;
M
Matthew Wilcox 已提交
1098

1099
	/*
M
Minwoo Im 已提交
1100
	 * Note: we (ab)use the fact that the prp fields survive if no data
1101 1102
	 * is attached to the request.
	 */
M
Matthew Wilcox 已提交
1103 1104 1105 1106 1107 1108 1109 1110
	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);

1111
	return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
M
Matthew Wilcox 已提交
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
}

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);
}

1124
static void abort_endio(struct request *req, blk_status_t error)
1125
{
C
Christoph Hellwig 已提交
1126 1127
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	struct nvme_queue *nvmeq = iod->nvmeq;
1128

1129 1130
	dev_warn(nvmeq->dev->ctrl.device,
		 "Abort status: 0x%x", nvme_req(req)->status);
1131 1132
	atomic_inc(&nvmeq->dev->ctrl.abort_limit);
	blk_mq_free_request(req);
1133 1134
}

K
Keith Busch 已提交
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
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);
}

1180
static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
K
Keith Busch 已提交
1181
{
C
Christoph Hellwig 已提交
1182 1183
	struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
	struct nvme_queue *nvmeq = iod->nvmeq;
K
Keith Busch 已提交
1184
	struct nvme_dev *dev = nvmeq->dev;
M
Matias Bjørling 已提交
1185 1186
	struct request *abort_req;
	struct nvme_command cmd;
K
Keith Busch 已提交
1187 1188 1189 1190 1191 1192 1193 1194
	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);
1195
		nvme_reset_ctrl(&dev->ctrl);
K
Keith Busch 已提交
1196 1197
		return BLK_EH_HANDLED;
	}
K
Keith Busch 已提交
1198

K
Keith Busch 已提交
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
	/*
	 * 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;
	}

1209
	/*
1210 1211 1212 1213 1214
	 * 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.
	 */
1215
	if (dev->ctrl.state == NVME_CTRL_RESETTING) {
1216
		dev_warn(dev->ctrl.device,
1217 1218
			 "I/O %d QID %d timeout, disable controller\n",
			 req->tag, nvmeq->qid);
1219
		nvme_dev_disable(dev, false);
1220
		nvme_req(req)->flags |= NVME_REQ_CANCELLED;
1221
		return BLK_EH_HANDLED;
K
Keith Busch 已提交
1222 1223
	}

1224 1225 1226 1227
	/*
 	 * 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.
1228
	 */
C
Christoph Hellwig 已提交
1229
	if (!nvmeq->qid || iod->aborted) {
1230
		dev_warn(dev->ctrl.device,
1231 1232
			 "I/O %d QID %d timeout, reset controller\n",
			 req->tag, nvmeq->qid);
1233
		nvme_dev_disable(dev, false);
1234
		nvme_reset_ctrl(&dev->ctrl);
K
Keith Busch 已提交
1235

1236 1237 1238 1239
		/*
		 * Mark the request as handled, since the inline shutdown
		 * forces all outstanding requests to complete.
		 */
1240
		nvme_req(req)->flags |= NVME_REQ_CANCELLED;
1241
		return BLK_EH_HANDLED;
K
Keith Busch 已提交
1242 1243
	}

1244
	if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) {
1245
		atomic_inc(&dev->ctrl.abort_limit);
1246
		return BLK_EH_RESET_TIMER;
1247
	}
1248
	iod->aborted = 1;
M
Matias Bjørling 已提交
1249

K
Keith Busch 已提交
1250 1251
	memset(&cmd, 0, sizeof(cmd));
	cmd.abort.opcode = nvme_admin_abort_cmd;
M
Matias Bjørling 已提交
1252
	cmd.abort.cid = req->tag;
K
Keith Busch 已提交
1253 1254
	cmd.abort.sqid = cpu_to_le16(nvmeq->qid);

1255 1256 1257
	dev_warn(nvmeq->dev->ctrl.device,
		"I/O %d QID %d timeout, aborting\n",
		 req->tag, nvmeq->qid);
1258 1259

	abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd,
1260
			BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
1261 1262 1263 1264 1265 1266 1267 1268
	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
1269

1270 1271 1272 1273 1274 1275
	/*
	 * 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
1276 1277
}

M
Matias Bjørling 已提交
1278 1279
static void nvme_free_queue(struct nvme_queue *nvmeq)
{
1280 1281
	dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
				(void *)nvmeq->cqes, nvmeq->cq_dma_addr);
1282 1283
	if (nvmeq->sq_cmds)
		dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
1284 1285 1286
					nvmeq->sq_cmds, nvmeq->sq_dma_addr);
}

1287
static void nvme_free_queues(struct nvme_dev *dev, int lowest)
1288 1289 1290
{
	int i;

1291 1292
	for (i = dev->ctrl.queue_count - 1; i >= lowest; i--) {
		dev->ctrl.queue_count--;
1293
		nvme_free_queue(&dev->queues[i]);
1294
	}
1295 1296
}

K
Keith Busch 已提交
1297 1298 1299 1300 1301
/**
 * 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
1302
{
K
Keith Busch 已提交
1303
	int vector;
M
Matthew Wilcox 已提交
1304

1305
	spin_lock_irq(&nvmeq->q_lock);
K
Keith Busch 已提交
1306 1307 1308 1309
	if (nvmeq->cq_vector == -1) {
		spin_unlock_irq(&nvmeq->q_lock);
		return 1;
	}
1310
	vector = nvmeq->cq_vector;
K
Keith Busch 已提交
1311
	nvmeq->dev->online_queues--;
K
Keith Busch 已提交
1312
	nvmeq->cq_vector = -1;
1313 1314
	spin_unlock_irq(&nvmeq->q_lock);

1315
	if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q)
1316
		blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q);
1317

1318
	pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq);
M
Matthew Wilcox 已提交
1319

K
Keith Busch 已提交
1320 1321
	return 0;
}
M
Matthew Wilcox 已提交
1322

1323
static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
K
Keith Busch 已提交
1324
{
1325
	struct nvme_queue *nvmeq = &dev->queues[0];
K
Keith Busch 已提交
1326

1327 1328 1329
	if (shutdown)
		nvme_shutdown_ctrl(&dev->ctrl);
	else
1330
		nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap);
1331 1332 1333 1334

	spin_lock_irq(&nvmeq->q_lock);
	nvme_process_cq(nvmeq);
	spin_unlock_irq(&nvmeq->q_lock);
M
Matthew Wilcox 已提交
1335 1336
}

1337 1338 1339 1340
static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
				int entry_size)
{
	int q_depth = dev->q_depth;
1341 1342
	unsigned q_size_aligned = roundup(q_depth * entry_size,
					  dev->ctrl.page_size);
1343 1344

	if (q_size_aligned * nr_io_queues > dev->cmb_size) {
1345
		u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues);
1346
		mem_per_q = round_down(mem_per_q, dev->ctrl.page_size);
1347
		q_depth = div_u64(mem_per_q, entry_size);
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363

		/*
		 * 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)
{
1364
	if (qid && dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) {
1365 1366
		unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth),
						      dev->ctrl.page_size);
1367
		nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset;
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
		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;
}

1379 1380
static int nvme_alloc_queue(struct nvme_dev *dev, int qid,
		int depth, int node)
M
Matthew Wilcox 已提交
1381
{
1382
	struct nvme_queue *nvmeq = &dev->queues[qid];
M
Matthew Wilcox 已提交
1383

1384 1385 1386
	if (dev->ctrl.queue_count > qid)
		return 0;

1387
	nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth),
J
Joe Perches 已提交
1388
					  &nvmeq->cq_dma_addr, GFP_KERNEL);
M
Matthew Wilcox 已提交
1389 1390 1391
	if (!nvmeq->cqes)
		goto free_nvmeq;

1392
	if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth))
M
Matthew Wilcox 已提交
1393 1394
		goto free_cqdma;

1395
	nvmeq->q_dmadev = dev->dev;
M
Matthew Wilcox 已提交
1396
	nvmeq->dev = dev;
M
Matthew Wilcox 已提交
1397 1398
	spin_lock_init(&nvmeq->q_lock);
	nvmeq->cq_head = 0;
M
Matthew Wilcox 已提交
1399
	nvmeq->cq_phase = 1;
1400
	nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
M
Matthew Wilcox 已提交
1401
	nvmeq->q_depth = depth;
K
Keith Busch 已提交
1402
	nvmeq->qid = qid;
1403
	nvmeq->cq_vector = -1;
1404
	dev->ctrl.queue_count++;
1405

1406
	return 0;
M
Matthew Wilcox 已提交
1407 1408

 free_cqdma:
1409
	dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes,
M
Matthew Wilcox 已提交
1410 1411
							nvmeq->cq_dma_addr);
 free_nvmeq:
1412
	return -ENOMEM;
M
Matthew Wilcox 已提交
1413 1414
}

1415
static int queue_request_irq(struct nvme_queue *nvmeq)
1416
{
1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
	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);
	}
1427 1428
}

1429
static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
M
Matthew Wilcox 已提交
1430
{
1431
	struct nvme_dev *dev = nvmeq->dev;
M
Matthew Wilcox 已提交
1432

1433
	spin_lock_irq(&nvmeq->q_lock);
1434 1435 1436
	nvmeq->sq_tail = 0;
	nvmeq->cq_head = 0;
	nvmeq->cq_phase = 1;
1437
	nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
1438
	memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
1439
	nvme_dbbuf_init(dev, nvmeq, qid);
K
Keith Busch 已提交
1440
	dev->online_queues++;
1441
	spin_unlock_irq(&nvmeq->q_lock);
1442 1443 1444 1445 1446 1447
}

static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
{
	struct nvme_dev *dev = nvmeq->dev;
	int result;
1448

K
Keith Busch 已提交
1449
	nvmeq->cq_vector = qid - 1;
M
Matthew Wilcox 已提交
1450 1451
	result = adapter_alloc_cq(dev, qid, nvmeq);
	if (result < 0)
1452
		return result;
M
Matthew Wilcox 已提交
1453 1454 1455 1456 1457

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

1458
	nvme_init_queue(nvmeq, qid);
1459
	result = queue_request_irq(nvmeq);
M
Matthew Wilcox 已提交
1460 1461 1462
	if (result < 0)
		goto release_sq;

1463
	return result;
M
Matthew Wilcox 已提交
1464 1465 1466 1467 1468

 release_sq:
	adapter_delete_sq(dev, qid);
 release_cq:
	adapter_delete_cq(dev, qid);
1469
	return result;
M
Matthew Wilcox 已提交
1470 1471
}

1472
static const struct blk_mq_ops nvme_mq_admin_ops = {
1473
	.queue_rq	= nvme_queue_rq,
1474
	.complete	= nvme_pci_complete_rq,
M
Matias Bjørling 已提交
1475
	.init_hctx	= nvme_admin_init_hctx,
1476
	.exit_hctx      = nvme_admin_exit_hctx,
1477
	.init_request	= nvme_init_request,
M
Matias Bjørling 已提交
1478 1479 1480
	.timeout	= nvme_timeout,
};

1481
static const struct blk_mq_ops nvme_mq_ops = {
M
Matias Bjørling 已提交
1482
	.queue_rq	= nvme_queue_rq,
1483
	.complete	= nvme_pci_complete_rq,
M
Matias Bjørling 已提交
1484 1485
	.init_hctx	= nvme_init_hctx,
	.init_request	= nvme_init_request,
1486
	.map_queues	= nvme_pci_map_queues,
M
Matias Bjørling 已提交
1487
	.timeout	= nvme_timeout,
J
Jens Axboe 已提交
1488
	.poll		= nvme_poll,
M
Matias Bjørling 已提交
1489 1490
};

1491 1492
static void nvme_dev_remove_admin(struct nvme_dev *dev)
{
1493
	if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) {
1494 1495 1496 1497 1498
		/*
		 * 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.
		 */
1499
		blk_mq_unquiesce_queue(dev->ctrl.admin_q);
1500
		blk_cleanup_queue(dev->ctrl.admin_q);
1501 1502 1503 1504
		blk_mq_free_tag_set(&dev->admin_tagset);
	}
}

M
Matias Bjørling 已提交
1505 1506
static int nvme_alloc_admin_tags(struct nvme_dev *dev)
{
1507
	if (!dev->ctrl.admin_q) {
M
Matias Bjørling 已提交
1508 1509
		dev->admin_tagset.ops = &nvme_mq_admin_ops;
		dev->admin_tagset.nr_hw_queues = 1;
K
Keith Busch 已提交
1510

K
Keith Busch 已提交
1511
		dev->admin_tagset.queue_depth = NVME_AQ_MQ_TAG_DEPTH;
M
Matias Bjørling 已提交
1512
		dev->admin_tagset.timeout = ADMIN_TIMEOUT;
1513
		dev->admin_tagset.numa_node = dev_to_node(dev->dev);
C
Chaitanya Kulkarni 已提交
1514
		dev->admin_tagset.cmd_size = nvme_pci_cmd_size(dev, false);
1515
		dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED;
M
Matias Bjørling 已提交
1516 1517 1518 1519
		dev->admin_tagset.driver_data = dev;

		if (blk_mq_alloc_tag_set(&dev->admin_tagset))
			return -ENOMEM;
1520
		dev->ctrl.admin_tagset = &dev->admin_tagset;
M
Matias Bjørling 已提交
1521

1522 1523
		dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset);
		if (IS_ERR(dev->ctrl.admin_q)) {
M
Matias Bjørling 已提交
1524 1525 1526
			blk_mq_free_tag_set(&dev->admin_tagset);
			return -ENOMEM;
		}
1527
		if (!blk_get_queue(dev->ctrl.admin_q)) {
1528
			nvme_dev_remove_admin(dev);
1529
			dev->ctrl.admin_q = NULL;
1530 1531
			return -ENODEV;
		}
K
Keith Busch 已提交
1532
	} else
1533
		blk_mq_unquiesce_queue(dev->ctrl.admin_q);
M
Matias Bjørling 已提交
1534 1535 1536 1537

	return 0;
}

1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563
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;
}

1564
static int nvme_pci_configure_admin_queue(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1565
{
1566
	int result;
M
Matthew Wilcox 已提交
1567 1568 1569
	u32 aqa;
	struct nvme_queue *nvmeq;

1570 1571 1572 1573
	result = nvme_remap_bar(dev, db_bar_size(dev, 0));
	if (result < 0)
		return result;

1574
	dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1, 0) ?
1575
				NVME_CAP_NSSRC(dev->ctrl.cap) : 0;
1576

1577 1578 1579
	if (dev->subsystem &&
	    (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO))
		writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS);
1580

1581
	result = nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap);
1582 1583
	if (result < 0)
		return result;
M
Matthew Wilcox 已提交
1584

1585 1586 1587 1588
	result = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH,
			dev_to_node(dev->dev));
	if (result)
		return result;
M
Matthew Wilcox 已提交
1589

1590
	nvmeq = &dev->queues[0];
M
Matthew Wilcox 已提交
1591 1592 1593
	aqa = nvmeq->q_depth - 1;
	aqa |= aqa << 16;

1594 1595 1596
	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
1597

1598
	result = nvme_enable_ctrl(&dev->ctrl, dev->ctrl.cap);
1599
	if (result)
K
Keith Busch 已提交
1600
		return result;
M
Matias Bjørling 已提交
1601

K
Keith Busch 已提交
1602
	nvmeq->cq_vector = 0;
1603
	nvme_init_queue(nvmeq, 0);
1604
	result = queue_request_irq(nvmeq);
1605 1606
	if (result) {
		nvmeq->cq_vector = -1;
K
Keith Busch 已提交
1607
		return result;
1608
	}
1609

M
Matthew Wilcox 已提交
1610 1611 1612
	return result;
}

1613
static int nvme_create_io_queues(struct nvme_dev *dev)
K
Keith Busch 已提交
1614
{
1615
	unsigned i, max;
1616
	int ret = 0;
K
Keith Busch 已提交
1617

1618
	for (i = dev->ctrl.queue_count; i <= dev->max_qid; i++) {
1619
		/* vector == qid - 1, match nvme_create_queue */
1620
		if (nvme_alloc_queue(dev, i, dev->q_depth,
1621
		     pci_irq_get_node(to_pci_dev(dev->dev), i - 1))) {
1622
			ret = -ENOMEM;
K
Keith Busch 已提交
1623
			break;
1624 1625
		}
	}
K
Keith Busch 已提交
1626

1627
	max = min(dev->max_qid, dev->ctrl.queue_count - 1);
1628
	for (i = dev->online_queues; i <= max; i++) {
1629
		ret = nvme_create_queue(&dev->queues[i], i);
K
Keith Busch 已提交
1630
		if (ret)
K
Keith Busch 已提交
1631
			break;
M
Matthew Wilcox 已提交
1632
	}
1633 1634 1635

	/*
	 * Ignore failing Create SQ/CQ commands, we can continue with less
1636 1637
	 * than the desired amount of queues, and even a controller without
	 * I/O queues can still be used to issue admin commands.  This might
1638 1639 1640
	 * be useful to upgrade a buggy firmware for example.
	 */
	return ret >= 0 ? 0 : ret;
M
Matthew Wilcox 已提交
1641 1642
}

1643 1644 1645 1646 1647 1648
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));

1649
	return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz  : x%08x\n",
1650 1651 1652 1653
		       ndev->cmbloc, ndev->cmbsz);
}
static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL);

1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
static u64 nvme_cmb_size_unit(struct nvme_dev *dev)
{
	u8 szu = (dev->cmbsz >> NVME_CMBSZ_SZU_SHIFT) & NVME_CMBSZ_SZU_MASK;

	return 1ULL << (12 + 4 * szu);
}

static u32 nvme_cmb_size(struct nvme_dev *dev)
{
	return (dev->cmbsz >> NVME_CMBSZ_SZ_SHIFT) & NVME_CMBSZ_SZ_MASK;
}

1666
static void nvme_map_cmb(struct nvme_dev *dev)
1667
{
1668
	u64 size, offset;
1669 1670
	resource_size_t bar_size;
	struct pci_dev *pdev = to_pci_dev(dev->dev);
1671
	int bar;
1672

1673
	dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ);
1674 1675
	if (!dev->cmbsz)
		return;
1676
	dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC);
1677

1678
	if (!use_cmb_sqes)
1679
		return;
1680

1681 1682
	size = nvme_cmb_size_unit(dev) * nvme_cmb_size(dev);
	offset = nvme_cmb_size_unit(dev) * NVME_CMB_OFST(dev->cmbloc);
1683 1684
	bar = NVME_CMB_BIR(dev->cmbloc);
	bar_size = pci_resource_len(pdev, bar);
1685 1686

	if (offset > bar_size)
1687
		return;
1688 1689 1690 1691 1692 1693 1694 1695 1696

	/*
	 * 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;

1697 1698 1699
	dev->cmb = ioremap_wc(pci_resource_start(pdev, bar) + offset, size);
	if (!dev->cmb)
		return;
1700
	dev->cmb_bus_addr = pci_bus_address(pdev, bar) + offset;
1701
	dev->cmb_size = size;
1702 1703 1704 1705 1706

	if (sysfs_add_file_to_group(&dev->ctrl.device->kobj,
				    &dev_attr_cmb.attr, NULL))
		dev_warn(dev->ctrl.device,
			 "failed to add sysfs attribute for CMB\n");
1707 1708 1709 1710 1711 1712 1713
}

static inline void nvme_release_cmb(struct nvme_dev *dev)
{
	if (dev->cmb) {
		iounmap(dev->cmb);
		dev->cmb = NULL;
1714 1715 1716
		sysfs_remove_file_from_group(&dev->ctrl.device->kobj,
					     &dev_attr_cmb.attr, NULL);
		dev->cmbsz = 0;
1717 1718 1719
	}
}

1720 1721
static int nvme_set_host_mem(struct nvme_dev *dev, u32 bits)
{
1722
	u64 dma_addr = dev->host_mem_descs_dma;
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
	struct nvme_command c;
	int ret;

	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);
	}
	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;
1759 1760 1761
	dma_free_coherent(dev->dev,
			dev->nr_host_mem_descs * sizeof(*dev->host_mem_descs),
			dev->host_mem_descs, dev->host_mem_descs_dma);
1762
	dev->host_mem_descs = NULL;
1763
	dev->nr_host_mem_descs = 0;
1764 1765
}

1766 1767
static int __nvme_alloc_host_mem(struct nvme_dev *dev, u64 preferred,
		u32 chunk_size)
K
Keith Busch 已提交
1768
{
1769
	struct nvme_host_mem_buf_desc *descs;
1770
	u32 max_entries, len;
1771
	dma_addr_t descs_dma;
1772
	int i = 0;
1773
	void **bufs;
1774
	u64 size, tmp;
1775 1776 1777 1778

	tmp = (preferred + chunk_size - 1);
	do_div(tmp, chunk_size);
	max_entries = tmp;
1779 1780 1781 1782

	if (dev->ctrl.hmmaxd && dev->ctrl.hmmaxd < max_entries)
		max_entries = dev->ctrl.hmmaxd;

1783 1784
	descs = dma_zalloc_coherent(dev->dev, max_entries * sizeof(*descs),
			&descs_dma, GFP_KERNEL);
1785 1786 1787 1788 1789 1790 1791
	if (!descs)
		goto out;

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

1792
	for (size = 0; size < preferred && i < max_entries; size += len) {
1793 1794
		dma_addr_t dma_addr;

1795
		len = min_t(u64, chunk_size, preferred - size);
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805
		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++;
	}

1806
	if (!size)
1807 1808 1809 1810 1811
		goto out_free_bufs;

	dev->nr_host_mem_descs = i;
	dev->host_mem_size = size;
	dev->host_mem_descs = descs;
1812
	dev->host_mem_descs_dma = descs_dma;
1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
	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:
1826 1827
	dma_free_coherent(dev->dev, max_entries * sizeof(*descs), descs,
			descs_dma);
1828 1829 1830 1831 1832
out:
	dev->host_mem_descs = NULL;
	return -ENOMEM;
}

1833 1834 1835 1836 1837
static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred)
{
	u32 chunk_size;

	/* start big and work our way down */
1838
	for (chunk_size = min_t(u64, preferred, PAGE_SIZE * MAX_ORDER_NR_PAGES);
1839
	     chunk_size >= max_t(u32, dev->ctrl.hmminds * 4096, PAGE_SIZE * 2);
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
	     chunk_size /= 2) {
		if (!__nvme_alloc_host_mem(dev, preferred, chunk_size)) {
			if (!min || dev->host_mem_size >= min)
				return 0;
			nvme_free_host_mem(dev);
		}
	}

	return -ENOMEM;
}

1851
static int nvme_setup_host_mem(struct nvme_dev *dev)
1852 1853 1854 1855 1856
{
	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;
1857
	int ret;
1858 1859 1860 1861 1862 1863 1864

	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);
1865
		return 0;
1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
	}

	/*
	 * 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) {
1879 1880 1881
		if (nvme_alloc_host_mem(dev, min, preferred)) {
			dev_warn(dev->ctrl.device,
				"failed to allocate host memory buffer.\n");
1882
			return 0; /* controller must work without HMB */
1883 1884 1885 1886 1887
		}

		dev_info(dev->ctrl.device,
			"allocated %lld MiB host memory buffer.\n",
			dev->host_mem_size >> ilog2(SZ_1M));
1888 1889
	}

1890 1891
	ret = nvme_set_host_mem(dev, enable_bits);
	if (ret)
1892
		nvme_free_host_mem(dev);
1893
	return ret;
K
Keith Busch 已提交
1894 1895
}

1896
static int nvme_setup_io_queues(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
1897
{
1898
	struct nvme_queue *adminq = &dev->queues[0];
1899
	struct pci_dev *pdev = to_pci_dev(dev->dev);
1900 1901
	int result, nr_io_queues;
	unsigned long size;
M
Matthew Wilcox 已提交
1902

1903
	nr_io_queues = num_present_cpus();
C
Christoph Hellwig 已提交
1904 1905
	result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues);
	if (result < 0)
M
Matthew Wilcox 已提交
1906
		return result;
C
Christoph Hellwig 已提交
1907

1908
	if (nr_io_queues == 0)
1909
		return 0;
M
Matthew Wilcox 已提交
1910

1911
	if (dev->cmb && (dev->cmbsz & NVME_CMBSZ_SQS)) {
1912 1913 1914 1915 1916 1917 1918 1919
		result = nvme_cmb_qdepth(dev, nr_io_queues,
				sizeof(struct nvme_command));
		if (result > 0)
			dev->q_depth = result;
		else
			nvme_release_cmb(dev);
	}

1920 1921 1922 1923 1924 1925 1926 1927 1928
	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;
1929

K
Keith Busch 已提交
1930
	/* Deregister the admin queue's interrupt */
1931
	pci_free_irq(pdev, 0, adminq);
K
Keith Busch 已提交
1932

1933 1934 1935 1936
	/*
	 * If we enable msix early due to not intx, disable it again before
	 * setting up the full range we need.
	 */
1937 1938 1939 1940 1941 1942
	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
1943

1944 1945 1946 1947 1948 1949 1950
	/*
	 * 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.
	 */

1951
	result = queue_request_irq(adminq);
1952 1953
	if (result) {
		adminq->cq_vector = -1;
K
Keith Busch 已提交
1954
		return result;
1955
	}
1956
	return nvme_create_io_queues(dev);
M
Matthew Wilcox 已提交
1957 1958
}

1959
static void nvme_del_queue_end(struct request *req, blk_status_t error)
K
Keith Busch 已提交
1960
{
K
Keith Busch 已提交
1961
	struct nvme_queue *nvmeq = req->end_io_data;
1962

K
Keith Busch 已提交
1963 1964
	blk_mq_free_request(req);
	complete(&nvmeq->dev->ioq_wait);
K
Keith Busch 已提交
1965 1966
}

1967
static void nvme_del_cq_end(struct request *req, blk_status_t error)
K
Keith Busch 已提交
1968
{
K
Keith Busch 已提交
1969
	struct nvme_queue *nvmeq = req->end_io_data;
K
Keith Busch 已提交
1970

K
Keith Busch 已提交
1971 1972 1973
	if (!error) {
		unsigned long flags;

1974 1975 1976 1977 1978 1979 1980
		/*
		 * 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
1981 1982
		nvme_process_cq(nvmeq);
		spin_unlock_irqrestore(&nvmeq->q_lock, flags);
K
Keith Busch 已提交
1983
	}
K
Keith Busch 已提交
1984 1985

	nvme_del_queue_end(req, error);
K
Keith Busch 已提交
1986 1987
}

K
Keith Busch 已提交
1988
static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode)
1989
{
K
Keith Busch 已提交
1990 1991 1992
	struct request_queue *q = nvmeq->dev->ctrl.admin_q;
	struct request *req;
	struct nvme_command cmd;
1993

K
Keith Busch 已提交
1994 1995 1996
	memset(&cmd, 0, sizeof(cmd));
	cmd.delete_queue.opcode = opcode;
	cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid);
1997

1998
	req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
K
Keith Busch 已提交
1999 2000
	if (IS_ERR(req))
		return PTR_ERR(req);
2001

K
Keith Busch 已提交
2002 2003 2004 2005 2006 2007 2008
	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;
2009 2010
}

2011
static void nvme_disable_io_queues(struct nvme_dev *dev)
K
Keith Busch 已提交
2012
{
2013
	int pass, queues = dev->online_queues - 1;
K
Keith Busch 已提交
2014 2015
	unsigned long timeout;
	u8 opcode = nvme_admin_delete_sq;
K
Keith Busch 已提交
2016

K
Keith Busch 已提交
2017
	for (pass = 0; pass < 2; pass++) {
K
Keith Busch 已提交
2018
		int sent = 0, i = queues;
K
Keith Busch 已提交
2019 2020 2021 2022

		reinit_completion(&dev->ioq_wait);
 retry:
		timeout = ADMIN_TIMEOUT;
2023
		for (; i > 0; i--, sent++)
2024
			if (nvme_delete_queue(&dev->queues[i], opcode))
K
Keith Busch 已提交
2025
				break;
2026

K
Keith Busch 已提交
2027 2028 2029 2030 2031 2032 2033 2034 2035
		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
2036 2037
}

2038
/*
2039
 * return error value only when tagset allocation failed
2040
 */
2041
static int nvme_dev_add(struct nvme_dev *dev)
M
Matthew Wilcox 已提交
2042
{
2043 2044
	int ret;

2045
	if (!dev->ctrl.tagset) {
2046 2047 2048 2049 2050
		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
2051
				min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1;
C
Chaitanya Kulkarni 已提交
2052 2053 2054 2055 2056
		dev->tagset.cmd_size = nvme_pci_cmd_size(dev, false);
		if ((dev->ctrl.sgls & ((1 << 0) | (1 << 1))) && sgl_threshold) {
			dev->tagset.cmd_size = max(dev->tagset.cmd_size,
					nvme_pci_cmd_size(dev, true));
		}
2057 2058
		dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE;
		dev->tagset.driver_data = dev;
M
Matthew Wilcox 已提交
2059

2060 2061 2062 2063 2064 2065
		ret = blk_mq_alloc_tag_set(&dev->tagset);
		if (ret) {
			dev_warn(dev->ctrl.device,
				"IO queues tagset allocation failed %d\n", ret);
			return ret;
		}
2066
		dev->ctrl.tagset = &dev->tagset;
2067 2068

		nvme_dbbuf_set(dev);
2069 2070 2071 2072 2073
	} 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);
2074
	}
2075

K
Keith Busch 已提交
2076
	return 0;
M
Matthew Wilcox 已提交
2077 2078
}

2079
static int nvme_pci_enable(struct nvme_dev *dev)
2080
{
2081
	int result = -ENOMEM;
2082
	struct pci_dev *pdev = to_pci_dev(dev->dev);
2083 2084 2085 2086 2087 2088

	if (pci_enable_device_mem(pdev))
		return result;

	pci_set_master(pdev);

2089 2090
	if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) &&
	    dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32)))
2091
		goto disable;
2092

2093
	if (readl(dev->bar + NVME_REG_CSTS) == -1) {
K
Keith Busch 已提交
2094
		result = -ENODEV;
2095
		goto disable;
K
Keith Busch 已提交
2096
	}
2097 2098

	/*
2099 2100 2101
	 * 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.
2102
	 */
2103 2104 2105
	result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
	if (result < 0)
		return result;
2106

2107
	dev->ctrl.cap = lo_hi_readq(dev->bar + NVME_REG_CAP);
2108

2109
	dev->q_depth = min_t(int, NVME_CAP_MQES(dev->ctrl.cap) + 1,
2110
				io_queue_depth);
2111
	dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap);
2112
	dev->dbs = dev->bar + 4096;
2113 2114 2115 2116 2117 2118 2119

	/*
	 * 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;
2120 2121
		dev_warn(dev->ctrl.device, "detected Apple NVMe controller, "
			"set queue depth=%u to work around controller resets\n",
2122
			dev->q_depth);
2123 2124
	} else if (pdev->vendor == PCI_VENDOR_ID_SAMSUNG &&
		   (pdev->device == 0xa821 || pdev->device == 0xa822) &&
2125
		   NVME_CAP_MQES(dev->ctrl.cap) == 0) {
2126 2127 2128
		dev->q_depth = 64;
		dev_err(dev->ctrl.device, "detected PM1725 NVMe controller, "
                        "set queue depth=%u\n", dev->q_depth);
2129 2130
	}

2131
	nvme_map_cmb(dev);
2132

K
Keith Busch 已提交
2133 2134
	pci_enable_pcie_error_reporting(pdev);
	pci_save_state(pdev);
2135 2136 2137 2138 2139 2140 2141 2142
	return 0;

 disable:
	pci_disable_device(pdev);
	return result;
}

static void nvme_dev_unmap(struct nvme_dev *dev)
2143 2144 2145
{
	if (dev->bar)
		iounmap(dev->bar);
2146
	pci_release_mem_regions(to_pci_dev(dev->dev));
2147 2148 2149
}

static void nvme_pci_disable(struct nvme_dev *dev)
2150
{
2151 2152
	struct pci_dev *pdev = to_pci_dev(dev->dev);

2153
	nvme_release_cmb(dev);
2154
	pci_free_irq_vectors(pdev);
2155

K
Keith Busch 已提交
2156 2157
	if (pci_is_enabled(pdev)) {
		pci_disable_pcie_error_reporting(pdev);
2158
		pci_disable_device(pdev);
K
Keith Busch 已提交
2159 2160 2161
	}
}

2162
static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown)
M
Matthew Wilcox 已提交
2163
{
2164
	int i;
K
Keith Busch 已提交
2165 2166
	bool dead = true;
	struct pci_dev *pdev = to_pci_dev(dev->dev);
2167

2168
	mutex_lock(&dev->shutdown_lock);
K
Keith Busch 已提交
2169 2170 2171
	if (pci_is_enabled(pdev)) {
		u32 csts = readl(dev->bar + NVME_REG_CSTS);

K
Keith Busch 已提交
2172 2173
		if (dev->ctrl.state == NVME_CTRL_LIVE ||
		    dev->ctrl.state == NVME_CTRL_RESETTING)
K
Keith Busch 已提交
2174 2175 2176
			nvme_start_freeze(&dev->ctrl);
		dead = !!((csts & NVME_CSTS_CFS) || !(csts & NVME_CSTS_RDY) ||
			pdev->error_state  != pci_channel_io_normal);
2177
	}
2178

K
Keith Busch 已提交
2179 2180 2181 2182
	/*
	 * Give the controller a chance to complete all entered requests if
	 * doing a safe shutdown.
	 */
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
	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
2197 2198
	nvme_stop_queues(&dev->ctrl);

2199 2200
	if (!dead) {
		nvme_disable_io_queues(dev);
2201
		nvme_disable_admin_queue(dev, shutdown);
K
Keith Busch 已提交
2202
	}
2203 2204 2205
	for (i = dev->ctrl.queue_count - 1; i >= 0; i--)
		nvme_suspend_queue(&dev->queues[i]);

2206
	nvme_pci_disable(dev);
2207

2208 2209
	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
2210 2211 2212 2213 2214 2215 2216 2217

	/*
	 * 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);
2218
	mutex_unlock(&dev->shutdown_lock);
M
Matthew Wilcox 已提交
2219 2220
}

M
Matthew Wilcox 已提交
2221 2222
static int nvme_setup_prp_pools(struct nvme_dev *dev)
{
2223
	dev->prp_page_pool = dma_pool_create("prp list page", dev->dev,
M
Matthew Wilcox 已提交
2224 2225 2226 2227
						PAGE_SIZE, PAGE_SIZE, 0);
	if (!dev->prp_page_pool)
		return -ENOMEM;

2228
	/* Optimisation for I/Os between 4k and 128k */
2229
	dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev,
2230 2231 2232 2233 2234
						256, 256, 0);
	if (!dev->prp_small_pool) {
		dma_pool_destroy(dev->prp_page_pool);
		return -ENOMEM;
	}
M
Matthew Wilcox 已提交
2235 2236 2237 2238 2239 2240
	return 0;
}

static void nvme_release_prp_pools(struct nvme_dev *dev)
{
	dma_pool_destroy(dev->prp_page_pool);
2241
	dma_pool_destroy(dev->prp_small_pool);
M
Matthew Wilcox 已提交
2242 2243
}

2244
static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
2245
{
2246
	struct nvme_dev *dev = to_nvme_dev(ctrl);
2247

2248
	nvme_dbbuf_dma_free(dev);
2249
	put_device(dev->dev);
2250 2251
	if (dev->tagset.tags)
		blk_mq_free_tag_set(&dev->tagset);
2252 2253
	if (dev->ctrl.admin_q)
		blk_put_queue(dev->ctrl.admin_q);
2254
	kfree(dev->queues);
2255
	free_opal_dev(dev->ctrl.opal_dev);
2256 2257 2258
	kfree(dev);
}

2259 2260
static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status)
{
2261
	dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status);
2262

2263
	nvme_get_ctrl(&dev->ctrl);
2264
	nvme_dev_disable(dev, false);
2265
	if (!queue_work(nvme_wq, &dev->remove_work))
2266 2267 2268
		nvme_put_ctrl(&dev->ctrl);
}

2269
static void nvme_reset_work(struct work_struct *work)
2270
{
2271 2272
	struct nvme_dev *dev =
		container_of(work, struct nvme_dev, ctrl.reset_work);
2273
	bool was_suspend = !!(dev->ctrl.ctrl_config & NVME_CC_SHN_NORMAL);
2274
	int result = -ENODEV;
2275
	enum nvme_ctrl_state new_state = NVME_CTRL_LIVE;
2276

2277
	if (WARN_ON(dev->ctrl.state != NVME_CTRL_RESETTING))
2278
		goto out;
2279

2280 2281 2282 2283
	/*
	 * If we're called to reset a live controller first shut it down before
	 * moving on.
	 */
2284
	if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
2285
		nvme_dev_disable(dev, false);
2286

2287
	result = nvme_pci_enable(dev);
2288
	if (result)
2289
		goto out;
2290

2291
	result = nvme_pci_configure_admin_queue(dev);
2292
	if (result)
2293
		goto out;
2294

K
Keith Busch 已提交
2295 2296
	result = nvme_alloc_admin_tags(dev);
	if (result)
2297
		goto out;
2298

2299 2300
	result = nvme_init_identify(&dev->ctrl);
	if (result)
2301
		goto out;
2302

2303 2304 2305 2306 2307 2308 2309 2310 2311
	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;
2312
	}
2313

2314 2315 2316 2317 2318 2319 2320
	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");
	}

2321 2322 2323 2324 2325
	if (dev->ctrl.hmpre) {
		result = nvme_setup_host_mem(dev);
		if (result < 0)
			goto out;
	}
2326

2327
	result = nvme_setup_io_queues(dev);
2328
	if (result)
2329
		goto out;
2330

2331 2332 2333 2334
	/*
	 * Keep the controller around but remove all namespaces if we don't have
	 * any working I/O queue.
	 */
2335
	if (dev->online_queues < 2) {
2336
		dev_warn(dev->ctrl.device, "IO queues not created\n");
2337
		nvme_kill_queues(&dev->ctrl);
2338
		nvme_remove_namespaces(&dev->ctrl);
2339
		new_state = NVME_CTRL_ADMIN_ONLY;
2340
	} else {
2341
		nvme_start_queues(&dev->ctrl);
K
Keith Busch 已提交
2342
		nvme_wait_freeze(&dev->ctrl);
2343 2344 2345
		/* hit this only when allocate tagset fails */
		if (nvme_dev_add(dev))
			new_state = NVME_CTRL_ADMIN_ONLY;
K
Keith Busch 已提交
2346
		nvme_unfreeze(&dev->ctrl);
2347 2348
	}

2349 2350 2351 2352 2353 2354 2355
	/*
	 * If only admin queue live, keep it to do further investigation or
	 * recovery.
	 */
	if (!nvme_change_ctrl_state(&dev->ctrl, new_state)) {
		dev_warn(dev->ctrl.device,
			"failed to mark controller state %d\n", new_state);
2356 2357
		goto out;
	}
2358

2359
	nvme_start_ctrl(&dev->ctrl);
2360
	return;
2361

2362
 out:
2363
	nvme_remove_dead_ctrl(dev, result);
2364 2365
}

2366
static void nvme_remove_dead_ctrl_work(struct work_struct *work)
K
Keith Busch 已提交
2367
{
2368
	struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work);
2369
	struct pci_dev *pdev = to_pci_dev(dev->dev);
K
Keith Busch 已提交
2370

2371
	nvme_kill_queues(&dev->ctrl);
K
Keith Busch 已提交
2372
	if (pci_get_drvdata(pdev))
K
Keith Busch 已提交
2373
		device_release_driver(&pdev->dev);
2374
	nvme_put_ctrl(&dev->ctrl);
K
Keith Busch 已提交
2375 2376
}

2377
static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
T
Tejun Heo 已提交
2378
{
2379
	*val = readl(to_nvme_dev(ctrl)->bar + off);
2380
	return 0;
T
Tejun Heo 已提交
2381 2382
}

2383
static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
2384
{
2385 2386 2387
	writel(val, to_nvme_dev(ctrl)->bar + off);
	return 0;
}
2388

2389 2390 2391 2392
static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
{
	*val = readq(to_nvme_dev(ctrl)->bar + off);
	return 0;
2393 2394
}

2395
static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
M
Ming Lin 已提交
2396
	.name			= "pcie",
2397
	.module			= THIS_MODULE,
2398
	.flags			= NVME_F_METADATA_SUPPORTED,
2399
	.reg_read32		= nvme_pci_reg_read32,
2400
	.reg_write32		= nvme_pci_reg_write32,
2401
	.reg_read64		= nvme_pci_reg_read64,
2402
	.free_ctrl		= nvme_pci_free_ctrl,
2403
	.submit_async_event	= nvme_pci_submit_async_event,
2404
};
2405

2406 2407 2408 2409
static int nvme_dev_map(struct nvme_dev *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev->dev);

2410
	if (pci_request_mem_regions(pdev, "nvme"))
2411 2412
		return -ENODEV;

2413
	if (nvme_remap_bar(dev, NVME_REG_DBS + 4096))
2414 2415
		goto release;

M
Max Gurtovoy 已提交
2416
	return 0;
2417
  release:
M
Max Gurtovoy 已提交
2418 2419
	pci_release_mem_regions(pdev);
	return -ENODEV;
2420 2421
}

2422
static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
{
	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;
2437 2438 2439 2440 2441 2442 2443 2444
	} else if (pdev->vendor == 0x144d && pdev->device == 0xa804) {
		/*
		 * Samsung SSD 960 EVO drops off the PCIe bus after system
		 * suspend on a Ryzen board, ASUS PRIME B350M-A.
		 */
		if (dmi_match(DMI_BOARD_VENDOR, "ASUSTeK COMPUTER INC.") &&
		    dmi_match(DMI_BOARD_NAME, "PRIME B350M-A"))
			return NVME_QUIRK_NO_APST;
2445 2446 2447 2448 2449
	}

	return 0;
}

2450
static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
M
Matthew Wilcox 已提交
2451
{
M
Matias Bjørling 已提交
2452
	int node, result = -ENOMEM;
M
Matthew Wilcox 已提交
2453
	struct nvme_dev *dev;
2454
	unsigned long quirks = id->driver_data;
M
Matthew Wilcox 已提交
2455

M
Matias Bjørling 已提交
2456 2457
	node = dev_to_node(&pdev->dev);
	if (node == NUMA_NO_NODE)
2458
		set_dev_node(&pdev->dev, first_memory_node);
M
Matias Bjørling 已提交
2459 2460

	dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node);
M
Matthew Wilcox 已提交
2461 2462
	if (!dev)
		return -ENOMEM;
2463 2464 2465

	dev->queues = kcalloc_node(num_possible_cpus() + 1,
			sizeof(struct nvme_queue), GFP_KERNEL, node);
M
Matthew Wilcox 已提交
2466 2467 2468
	if (!dev->queues)
		goto free;

2469
	dev->dev = get_device(&pdev->dev);
K
Keith Busch 已提交
2470
	pci_set_drvdata(pdev, dev);
2471

2472 2473
	result = nvme_dev_map(dev);
	if (result)
2474
		goto put_pci;
2475

2476
	INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work);
2477
	INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
2478
	mutex_init(&dev->shutdown_lock);
K
Keith Busch 已提交
2479
	init_completion(&dev->ioq_wait);
M
Matthew Wilcox 已提交
2480

M
Matthew Wilcox 已提交
2481 2482
	result = nvme_setup_prp_pools(dev);
	if (result)
2483
		goto unmap;
2484

2485
	quirks |= check_vendor_combination_bug(pdev);
2486

2487
	result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops,
2488
			quirks);
2489
	if (result)
2490
		goto release_pools;
2491

2492 2493
	dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));

2494 2495
	nvme_reset_ctrl(&dev->ctrl);

M
Matthew Wilcox 已提交
2496 2497
	return 0;

2498
 release_pools:
M
Matthew Wilcox 已提交
2499
	nvme_release_prp_pools(dev);
2500 2501
 unmap:
	nvme_dev_unmap(dev);
K
Keith Busch 已提交
2502
 put_pci:
2503
	put_device(dev->dev);
M
Matthew Wilcox 已提交
2504 2505 2506 2507 2508 2509
 free:
	kfree(dev->queues);
	kfree(dev);
	return result;
}

2510
static void nvme_reset_prepare(struct pci_dev *pdev)
2511
{
K
Keith Busch 已提交
2512
	struct nvme_dev *dev = pci_get_drvdata(pdev);
2513
	nvme_dev_disable(dev, false);
2514
}
2515

2516 2517
static void nvme_reset_done(struct pci_dev *pdev)
{
2518
	struct nvme_dev *dev = pci_get_drvdata(pdev);
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Sagi Grimberg 已提交
2519
	nvme_reset_ctrl_sync(&dev->ctrl);
2520 2521
}

2522 2523 2524
static void nvme_shutdown(struct pci_dev *pdev)
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);
2525
	nvme_dev_disable(dev, true);
2526 2527
}

2528 2529 2530 2531 2532
/*
 * 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.
 */
2533
static void nvme_remove(struct pci_dev *pdev)
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Matthew Wilcox 已提交
2534 2535
{
	struct nvme_dev *dev = pci_get_drvdata(pdev);
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Keith Busch 已提交
2536

2537 2538
	nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING);

2539
	cancel_work_sync(&dev->ctrl.reset_work);
K
Keith Busch 已提交
2540
	pci_set_drvdata(pdev, NULL);
2541

2542
	if (!pci_device_is_present(pdev)) {
2543
		nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD);
2544 2545
		nvme_dev_disable(dev, false);
	}
2546

2547
	flush_work(&dev->ctrl.reset_work);
2548 2549
	nvme_stop_ctrl(&dev->ctrl);
	nvme_remove_namespaces(&dev->ctrl);
2550
	nvme_dev_disable(dev, true);
2551
	nvme_free_host_mem(dev);
M
Matias Bjørling 已提交
2552
	nvme_dev_remove_admin(dev);
2553
	nvme_free_queues(dev, 0);
2554
	nvme_uninit_ctrl(&dev->ctrl);
K
Keith Busch 已提交
2555
	nvme_release_prp_pools(dev);
2556
	nvme_dev_unmap(dev);
2557
	nvme_put_ctrl(&dev->ctrl);
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Matthew Wilcox 已提交
2558 2559
}

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Keith Busch 已提交
2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577
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;
}

2578
#ifdef CONFIG_PM_SLEEP
2579 2580 2581 2582 2583
static int nvme_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct nvme_dev *ndev = pci_get_drvdata(pdev);

2584
	nvme_dev_disable(ndev, true);
2585 2586 2587 2588 2589 2590 2591 2592
	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);

2593
	nvme_reset_ctrl(&ndev->ctrl);
K
Keith Busch 已提交
2594
	return 0;
2595
}
2596
#endif
2597 2598

static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
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Matthew Wilcox 已提交
2599

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2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613
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:
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Keith Busch 已提交
2614 2615
		dev_warn(dev->ctrl.device,
			"frozen state error detected, reset controller\n");
2616
		nvme_dev_disable(dev, false);
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Keith Busch 已提交
2617 2618
		return PCI_ERS_RESULT_NEED_RESET;
	case pci_channel_io_perm_failure:
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Keith Busch 已提交
2619 2620
		dev_warn(dev->ctrl.device,
			"failure state error detected, request disconnect\n");
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Keith Busch 已提交
2621 2622 2623 2624 2625 2626 2627 2628 2629
		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);

2630
	dev_info(dev->ctrl.device, "restart after slot reset\n");
K
Keith Busch 已提交
2631
	pci_restore_state(pdev);
2632
	nvme_reset_ctrl(&dev->ctrl);
K
Keith Busch 已提交
2633 2634 2635 2636 2637 2638 2639 2640
	return PCI_ERS_RESULT_RECOVERED;
}

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

2641
static const struct pci_error_handlers nvme_err_handler = {
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Matthew Wilcox 已提交
2642 2643 2644
	.error_detected	= nvme_error_detected,
	.slot_reset	= nvme_slot_reset,
	.resume		= nvme_error_resume,
2645 2646
	.reset_prepare	= nvme_reset_prepare,
	.reset_done	= nvme_reset_done,
M
Matthew Wilcox 已提交
2647 2648
};

2649
static const struct pci_device_id nvme_id_table[] = {
2650
	{ PCI_VDEVICE(INTEL, 0x0953),
2651
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2652
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2653 2654
	{ PCI_VDEVICE(INTEL, 0x0a53),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2655
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2656 2657
	{ PCI_VDEVICE(INTEL, 0x0a54),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
2658
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2659 2660 2661
	{ PCI_VDEVICE(INTEL, 0x0a55),
		.driver_data = NVME_QUIRK_STRIPE_SIZE |
				NVME_QUIRK_DEALLOCATE_ZEROES, },
2662 2663
	{ PCI_VDEVICE(INTEL, 0xf1a5),	/* Intel 600P/P3100 */
		.driver_data = NVME_QUIRK_NO_DEEPEST_PS },
2664 2665
	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */
		.driver_data = NVME_QUIRK_IDENTIFY_CNS, },
2666 2667
	{ PCI_DEVICE(0x1c58, 0x0003),	/* HGST adapter */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
2668 2669
	{ PCI_DEVICE(0x1c58, 0x0023),	/* WDC SN200 adapter */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
2670 2671
	{ PCI_DEVICE(0x1c5f, 0x0540),	/* Memblaze Pblaze4 adapter */
		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
2672 2673 2674 2675
	{ 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, },
C
Christoph Hellwig 已提交
2676 2677 2678 2679
	{ PCI_DEVICE(0x1d1d, 0x1f1f),	/* LighNVM qemu device */
		.driver_data = NVME_QUIRK_LIGHTNVM, },
	{ PCI_DEVICE(0x1d1d, 0x2807),	/* CNEX WL */
		.driver_data = NVME_QUIRK_LIGHTNVM, },
M
Matthew Wilcox 已提交
2680
	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
2681
	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) },
2682
	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },
M
Matthew Wilcox 已提交
2683 2684 2685 2686 2687 2688 2689 2690
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, nvme_id_table);

static struct pci_driver nvme_driver = {
	.name		= "nvme",
	.id_table	= nvme_id_table,
	.probe		= nvme_probe,
2691
	.remove		= nvme_remove,
2692
	.shutdown	= nvme_shutdown,
2693 2694 2695
	.driver		= {
		.pm	= &nvme_dev_pm_ops,
	},
K
Keith Busch 已提交
2696
	.sriov_configure = nvme_pci_sriov_configure,
M
Matthew Wilcox 已提交
2697 2698 2699 2700 2701
	.err_handler	= &nvme_err_handler,
};

static int __init nvme_init(void)
{
2702
	return pci_register_driver(&nvme_driver);
M
Matthew Wilcox 已提交
2703 2704 2705 2706 2707
}

static void __exit nvme_exit(void)
{
	pci_unregister_driver(&nvme_driver);
2708
	flush_workqueue(nvme_wq);
2709
	_nvme_check_size();
M
Matthew Wilcox 已提交
2710 2711 2712 2713
}

MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
MODULE_LICENSE("GPL");
2714
MODULE_VERSION("1.0");
M
Matthew Wilcox 已提交
2715 2716
module_init(nvme_init);
module_exit(nvme_exit);