core.c 73.3 KB
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/*
 * NVM Express device driver
 * Copyright (c) 2011-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/blkdev.h>
#include <linux/blk-mq.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/hdreg.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
#include <linux/list_sort.h>
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#include <linux/slab.h>
#include <linux/types.h>
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#include <linux/pr.h>
#include <linux/ptrace.h>
#include <linux/nvme_ioctl.h>
#include <linux/t10-pi.h>
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#include <linux/pm_qos.h>
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#include <asm/unaligned.h>
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#include "nvme.h"
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#include "fabrics.h"
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#define NVME_MINORS		(1U << MINORBITS)

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unsigned int admin_timeout = 60;
module_param(admin_timeout, uint, 0644);
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MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
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EXPORT_SYMBOL_GPL(admin_timeout);
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unsigned int nvme_io_timeout = 30;
module_param_named(io_timeout, nvme_io_timeout, uint, 0644);
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MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
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EXPORT_SYMBOL_GPL(nvme_io_timeout);
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static unsigned char shutdown_timeout = 5;
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module_param(shutdown_timeout, byte, 0644);
MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");

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static u8 nvme_max_retries = 5;
module_param_named(max_retries, nvme_max_retries, byte, 0644);
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MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
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static unsigned long default_ps_max_latency_us = 100000;
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module_param(default_ps_max_latency_us, ulong, 0644);
MODULE_PARM_DESC(default_ps_max_latency_us,
		 "max power saving latency for new devices; use PM QOS to change per device");

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static bool force_apst;
module_param(force_apst, bool, 0644);
MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off");

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static bool streams;
module_param(streams, bool, 0644);
MODULE_PARM_DESC(streams, "turn on support for Streams write directives");

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struct workqueue_struct *nvme_wq;
EXPORT_SYMBOL_GPL(nvme_wq);

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static DEFINE_IDA(nvme_instance_ida);
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static dev_t nvme_chr_devt;
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static struct class *nvme_class;

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static __le32 nvme_get_log_dw10(u8 lid, size_t size)
{
	return cpu_to_le32((((size / 4) - 1) << 16) | lid);
}

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int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
{
	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
		return -EBUSY;
	if (!queue_work(nvme_wq, &ctrl->reset_work))
		return -EBUSY;
	return 0;
}
EXPORT_SYMBOL_GPL(nvme_reset_ctrl);

static int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
{
	int ret;

	ret = nvme_reset_ctrl(ctrl);
	if (!ret)
		flush_work(&ctrl->reset_work);
	return ret;
}

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static void nvme_delete_ctrl_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, delete_work);

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	flush_work(&ctrl->reset_work);
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	nvme_stop_ctrl(ctrl);
	nvme_remove_namespaces(ctrl);
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	ctrl->ops->delete_ctrl(ctrl);
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	nvme_uninit_ctrl(ctrl);
	nvme_put_ctrl(ctrl);
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}

int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
{
	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
		return -EBUSY;
	if (!queue_work(nvme_wq, &ctrl->delete_work))
		return -EBUSY;
	return 0;
}
EXPORT_SYMBOL_GPL(nvme_delete_ctrl);

int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
{
	int ret = 0;

	/*
	 * Keep a reference until the work is flushed since ->delete_ctrl
	 * can free the controller.
	 */
	nvme_get_ctrl(ctrl);
	ret = nvme_delete_ctrl(ctrl);
	if (!ret)
		flush_work(&ctrl->delete_work);
	nvme_put_ctrl(ctrl);
	return ret;
}
EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync);

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static blk_status_t nvme_error_status(struct request *req)
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{
	switch (nvme_req(req)->status & 0x7ff) {
	case NVME_SC_SUCCESS:
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		return BLK_STS_OK;
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	case NVME_SC_CAP_EXCEEDED:
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		return BLK_STS_NOSPC;
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	case NVME_SC_ONCS_NOT_SUPPORTED:
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		return BLK_STS_NOTSUPP;
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	case NVME_SC_WRITE_FAULT:
	case NVME_SC_READ_ERROR:
	case NVME_SC_UNWRITTEN_BLOCK:
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	case NVME_SC_ACCESS_DENIED:
	case NVME_SC_READ_ONLY:
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		return BLK_STS_MEDIUM;
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	case NVME_SC_GUARD_CHECK:
	case NVME_SC_APPTAG_CHECK:
	case NVME_SC_REFTAG_CHECK:
	case NVME_SC_INVALID_PI:
		return BLK_STS_PROTECTION;
	case NVME_SC_RESERVATION_CONFLICT:
		return BLK_STS_NEXUS;
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	default:
		return BLK_STS_IOERR;
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	}
}

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static inline bool nvme_req_needs_retry(struct request *req)
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{
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	if (blk_noretry_request(req))
		return false;
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	if (nvme_req(req)->status & NVME_SC_DNR)
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		return false;
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	if (nvme_req(req)->retries >= nvme_max_retries)
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		return false;
	return true;
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}

void nvme_complete_rq(struct request *req)
{
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	if (unlikely(nvme_req(req)->status && nvme_req_needs_retry(req))) {
		nvme_req(req)->retries++;
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		blk_mq_requeue_request(req, true);
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		return;
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	}

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	blk_mq_end_request(req, nvme_error_status(req));
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}
EXPORT_SYMBOL_GPL(nvme_complete_rq);

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void nvme_cancel_request(struct request *req, void *data, bool reserved)
{
	int status;

	if (!blk_mq_request_started(req))
		return;

	dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
				"Cancelling I/O %d", req->tag);

	status = NVME_SC_ABORT_REQ;
	if (blk_queue_dying(req->q))
		status |= NVME_SC_DNR;
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	nvme_req(req)->status = status;
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	blk_mq_complete_request(req);
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}
EXPORT_SYMBOL_GPL(nvme_cancel_request);

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bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
		enum nvme_ctrl_state new_state)
{
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	enum nvme_ctrl_state old_state;
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	unsigned long flags;
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	bool changed = false;

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	spin_lock_irqsave(&ctrl->lock, flags);
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	old_state = ctrl->state;
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	switch (new_state) {
	case NVME_CTRL_LIVE:
		switch (old_state) {
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		case NVME_CTRL_NEW:
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		case NVME_CTRL_RESETTING:
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		case NVME_CTRL_RECONNECTING:
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			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
	case NVME_CTRL_RESETTING:
		switch (old_state) {
		case NVME_CTRL_NEW:
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		case NVME_CTRL_LIVE:
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
	case NVME_CTRL_RECONNECTING:
		switch (old_state) {
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		case NVME_CTRL_LIVE:
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
	case NVME_CTRL_DELETING:
		switch (old_state) {
		case NVME_CTRL_LIVE:
		case NVME_CTRL_RESETTING:
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		case NVME_CTRL_RECONNECTING:
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			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
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	case NVME_CTRL_DEAD:
		switch (old_state) {
		case NVME_CTRL_DELETING:
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
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	default:
		break;
	}

	if (changed)
		ctrl->state = new_state;

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	spin_unlock_irqrestore(&ctrl->lock, flags);
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	return changed;
}
EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);

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static void nvme_free_ns(struct kref *kref)
{
	struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);

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	if (ns->ndev)
		nvme_nvm_unregister(ns);
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	put_disk(ns->disk);
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	ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
	nvme_put_ctrl(ns->ctrl);
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	kfree(ns);
}

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static void nvme_put_ns(struct nvme_ns *ns)
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{
	kref_put(&ns->kref, nvme_free_ns);
}

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struct request *nvme_alloc_request(struct request_queue *q,
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		struct nvme_command *cmd, unsigned int flags, int qid)
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{
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	unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
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	struct request *req;

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	if (qid == NVME_QID_ANY) {
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		req = blk_mq_alloc_request(q, op, flags);
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	} else {
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		req = blk_mq_alloc_request_hctx(q, op, flags,
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				qid ? qid - 1 : 0);
	}
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	if (IS_ERR(req))
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		return req;
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	req->cmd_flags |= REQ_FAILFAST_DRIVER;
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	nvme_req(req)->cmd = cmd;
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	return req;
}
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EXPORT_SYMBOL_GPL(nvme_alloc_request);
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static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
{
	struct nvme_command c;

	memset(&c, 0, sizeof(c));

	c.directive.opcode = nvme_admin_directive_send;
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	c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
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	c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
	c.directive.dtype = NVME_DIR_IDENTIFY;
	c.directive.tdtype = NVME_DIR_STREAMS;
	c.directive.endir = enable ? NVME_DIR_ENDIR : 0;

	return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
}

static int nvme_disable_streams(struct nvme_ctrl *ctrl)
{
	return nvme_toggle_streams(ctrl, false);
}

static int nvme_enable_streams(struct nvme_ctrl *ctrl)
{
	return nvme_toggle_streams(ctrl, true);
}

static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
				  struct streams_directive_params *s, u32 nsid)
{
	struct nvme_command c;

	memset(&c, 0, sizeof(c));
	memset(s, 0, sizeof(*s));

	c.directive.opcode = nvme_admin_directive_recv;
	c.directive.nsid = cpu_to_le32(nsid);
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	c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
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	c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
	c.directive.dtype = NVME_DIR_STREAMS;

	return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
}

static int nvme_configure_directives(struct nvme_ctrl *ctrl)
{
	struct streams_directive_params s;
	int ret;

	if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
		return 0;
	if (!streams)
		return 0;

	ret = nvme_enable_streams(ctrl);
	if (ret)
		return ret;

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	ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
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	if (ret)
		return ret;

	ctrl->nssa = le16_to_cpu(s.nssa);
	if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
		dev_info(ctrl->device, "too few streams (%u) available\n",
					ctrl->nssa);
		nvme_disable_streams(ctrl);
		return 0;
	}

	ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
	dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
	return 0;
}

/*
 * Check if 'req' has a write hint associated with it. If it does, assign
 * a valid namespace stream to the write.
 */
static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
				     struct request *req, u16 *control,
				     u32 *dsmgmt)
{
	enum rw_hint streamid = req->write_hint;

	if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
		streamid = 0;
	else {
		streamid--;
		if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
			return;

		*control |= NVME_RW_DTYPE_STREAMS;
		*dsmgmt |= streamid << 16;
	}

	if (streamid < ARRAY_SIZE(req->q->write_hints))
		req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
}

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static inline void nvme_setup_flush(struct nvme_ns *ns,
		struct nvme_command *cmnd)
{
	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->common.opcode = nvme_cmd_flush;
	cmnd->common.nsid = cpu_to_le32(ns->ns_id);
}

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static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
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		struct nvme_command *cmnd)
{
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	unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
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	struct nvme_dsm_range *range;
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	struct bio *bio;
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	range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
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	if (!range)
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		return BLK_STS_RESOURCE;
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	__rq_for_each_bio(bio, req) {
		u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
		u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;

		range[n].cattr = cpu_to_le32(0);
		range[n].nlb = cpu_to_le32(nlb);
		range[n].slba = cpu_to_le64(slba);
		n++;
	}

	if (WARN_ON_ONCE(n != segments)) {
		kfree(range);
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		return BLK_STS_IOERR;
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	}
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	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->dsm.opcode = nvme_cmd_dsm;
	cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
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	cmnd->dsm.nr = cpu_to_le32(segments - 1);
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	cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);

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	req->special_vec.bv_page = virt_to_page(range);
	req->special_vec.bv_offset = offset_in_page(range);
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	req->special_vec.bv_len = sizeof(*range) * segments;
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	req->rq_flags |= RQF_SPECIAL_PAYLOAD;
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	return BLK_STS_OK;
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}

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static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
		struct request *req, struct nvme_command *cmnd)
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{
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	struct nvme_ctrl *ctrl = ns->ctrl;
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	u16 control = 0;
	u32 dsmgmt = 0;

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	/*
	 * If formated with metadata, require the block layer provide a buffer
	 * unless this namespace is formated such that the metadata can be
	 * stripped/generated by the controller with PRACT=1.
	 */
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	if (ns && ns->ms &&
	    (!ns->pi_type || ns->ms != sizeof(struct t10_pi_tuple)) &&
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	    !blk_integrity_rq(req) && !blk_rq_is_passthrough(req))
		return BLK_STS_NOTSUPP;

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	if (req->cmd_flags & REQ_FUA)
		control |= NVME_RW_FUA;
	if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
		control |= NVME_RW_LR;

	if (req->cmd_flags & REQ_RAHEAD)
		dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;

	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
	cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
	cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
	cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);

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	if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
		nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);

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	if (ns->ms) {
		switch (ns->pi_type) {
		case NVME_NS_DPS_PI_TYPE3:
			control |= NVME_RW_PRINFO_PRCHK_GUARD;
			break;
		case NVME_NS_DPS_PI_TYPE1:
		case NVME_NS_DPS_PI_TYPE2:
			control |= NVME_RW_PRINFO_PRCHK_GUARD |
					NVME_RW_PRINFO_PRCHK_REF;
			cmnd->rw.reftag = cpu_to_le32(
					nvme_block_nr(ns, blk_rq_pos(req)));
			break;
		}
		if (!blk_integrity_rq(req))
			control |= NVME_RW_PRINFO_PRACT;
	}

	cmnd->rw.control = cpu_to_le16(control);
	cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
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	return 0;
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}

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blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
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		struct nvme_command *cmd)
{
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	blk_status_t ret = BLK_STS_OK;
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	if (!(req->rq_flags & RQF_DONTPREP)) {
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		nvme_req(req)->retries = 0;
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		nvme_req(req)->flags = 0;
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		req->rq_flags |= RQF_DONTPREP;
	}

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	switch (req_op(req)) {
	case REQ_OP_DRV_IN:
	case REQ_OP_DRV_OUT:
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		memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
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		break;
	case REQ_OP_FLUSH:
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		nvme_setup_flush(ns, cmd);
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		break;
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	case REQ_OP_WRITE_ZEROES:
		/* currently only aliased to deallocate for a few ctrls: */
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	case REQ_OP_DISCARD:
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		ret = nvme_setup_discard(ns, req, cmd);
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		break;
	case REQ_OP_READ:
	case REQ_OP_WRITE:
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		ret = nvme_setup_rw(ns, req, cmd);
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		break;
	default:
		WARN_ON_ONCE(1);
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		return BLK_STS_IOERR;
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	}
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	cmd->common.command_id = req->tag;
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	return ret;
}
EXPORT_SYMBOL_GPL(nvme_setup_cmd);

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/*
 * Returns 0 on success.  If the result is negative, it's a Linux error code;
 * if the result is positive, it's an NVM Express status code
 */
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
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		union nvme_result *result, void *buffer, unsigned bufflen,
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		unsigned timeout, int qid, int at_head, int flags)
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{
	struct request *req;
	int ret;

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	req = nvme_alloc_request(q, cmd, flags, qid);
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	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

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	if (buffer && bufflen) {
		ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
		if (ret)
			goto out;
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	}

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	blk_execute_rq(req->q, NULL, req, at_head);
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	if (result)
		*result = nvme_req(req)->result;
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	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
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 out:
	blk_mq_free_request(req);
	return ret;
}
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EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
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int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
		void *buffer, unsigned bufflen)
{
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	return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
			NVME_QID_ANY, 0, 0);
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}
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EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
607

608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
		unsigned len, u32 seed, bool write)
{
	struct bio_integrity_payload *bip;
	int ret = -ENOMEM;
	void *buf;

	buf = kmalloc(len, GFP_KERNEL);
	if (!buf)
		goto out;

	ret = -EFAULT;
	if (write && copy_from_user(buf, ubuf, len))
		goto out_free_meta;

	bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
	if (IS_ERR(bip)) {
		ret = PTR_ERR(bip);
		goto out_free_meta;
	}

	bip->bip_iter.bi_size = len;
	bip->bip_iter.bi_sector = seed;
	ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
			offset_in_page(buf));
	if (ret == len)
		return buf;
	ret = -ENOMEM;
out_free_meta:
	kfree(buf);
out:
	return ERR_PTR(ret);
}

642
static int nvme_submit_user_cmd(struct request_queue *q,
643 644 645
		struct nvme_command *cmd, void __user *ubuffer,
		unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
		u32 meta_seed, u32 *result, unsigned timeout)
646
{
647
	bool write = nvme_is_write(cmd);
648 649
	struct nvme_ns *ns = q->queuedata;
	struct gendisk *disk = ns ? ns->disk : NULL;
650
	struct request *req;
651 652
	struct bio *bio = NULL;
	void *meta = NULL;
653 654
	int ret;

655
	req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
656 657 658 659 660 661
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

	if (ubuffer && bufflen) {
662 663 664 665 666
		ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
				GFP_KERNEL);
		if (ret)
			goto out;
		bio = req->bio;
667
		bio->bi_disk = disk;
668 669 670 671 672
		if (disk && meta_buffer && meta_len) {
			meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
					meta_seed, write);
			if (IS_ERR(meta)) {
				ret = PTR_ERR(meta);
673 674 675 676
				goto out_unmap;
			}
		}
	}
677

678
	blk_execute_rq(req->q, disk, req, 0);
679 680 681 682
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
683
	if (result)
684
		*result = le32_to_cpu(nvme_req(req)->result.u32);
685 686 687 688 689 690
	if (meta && !ret && !write) {
		if (copy_to_user(meta_buffer, meta, meta_len))
			ret = -EFAULT;
	}
	kfree(meta);
 out_unmap:
691
	if (bio)
692
		blk_rq_unmap_user(bio);
693 694 695 696 697
 out:
	blk_mq_free_request(req);
	return ret;
}

698
static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
S
Sagi Grimberg 已提交
699 700 701 702 703
{
	struct nvme_ctrl *ctrl = rq->end_io_data;

	blk_mq_free_request(rq);

704
	if (status) {
S
Sagi Grimberg 已提交
705
		dev_err(ctrl->device,
706 707
			"failed nvme_keep_alive_end_io error=%d\n",
				status);
S
Sagi Grimberg 已提交
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
		return;
	}

	schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
}

static int nvme_keep_alive(struct nvme_ctrl *ctrl)
{
	struct nvme_command c;
	struct request *rq;

	memset(&c, 0, sizeof(c));
	c.common.opcode = nvme_admin_keep_alive;

	rq = nvme_alloc_request(ctrl->admin_q, &c, BLK_MQ_REQ_RESERVED,
			NVME_QID_ANY);
	if (IS_ERR(rq))
		return PTR_ERR(rq);

	rq->timeout = ctrl->kato * HZ;
	rq->end_io_data = ctrl;

	blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);

	return 0;
}

static void nvme_keep_alive_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
			struct nvme_ctrl, ka_work);

	if (nvme_keep_alive(ctrl)) {
		/* allocation failure, reset the controller */
		dev_err(ctrl->device, "keep-alive failed\n");
743
		nvme_reset_ctrl(ctrl);
S
Sagi Grimberg 已提交
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
		return;
	}
}

void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
{
	if (unlikely(ctrl->kato == 0))
		return;

	INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
	schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
}
EXPORT_SYMBOL_GPL(nvme_start_keep_alive);

void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
{
	if (unlikely(ctrl->kato == 0))
		return;

	cancel_delayed_work_sync(&ctrl->ka_work);
}
EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);

K
Keith Busch 已提交
767
static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
768 769 770 771 772 773
{
	struct nvme_command c = { };
	int error;

	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
	c.identify.opcode = nvme_admin_identify;
774
	c.identify.cns = NVME_ID_CNS_CTRL;
775 776 777 778 779 780 781 782 783 784 785 786

	*id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
	if (!*id)
		return -ENOMEM;

	error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
			sizeof(struct nvme_id_ctrl));
	if (error)
		kfree(*id);
	return error;
}

787 788
static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
		u8 *eui64, u8 *nguid, uuid_t *uuid)
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
{
	struct nvme_command c = { };
	int status;
	void *data;
	int pos;
	int len;

	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
	c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;

	data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

804
	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
805 806 807 808 809 810 811 812 813 814 815 816 817
				      NVME_IDENTIFY_DATA_SIZE);
	if (status)
		goto free_data;

	for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
		struct nvme_ns_id_desc *cur = data + pos;

		if (cur->nidl == 0)
			break;

		switch (cur->nidt) {
		case NVME_NIDT_EUI64:
			if (cur->nidl != NVME_NIDT_EUI64_LEN) {
818
				dev_warn(ctrl->device,
819 820 821 822 823
					 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_EUI64_LEN;
824
			memcpy(eui64, data + pos + sizeof(*cur), len);
825 826 827
			break;
		case NVME_NIDT_NGUID:
			if (cur->nidl != NVME_NIDT_NGUID_LEN) {
828
				dev_warn(ctrl->device,
829 830 831 832 833
					 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_NGUID_LEN;
834
			memcpy(nguid, data + pos + sizeof(*cur), len);
835 836 837
			break;
		case NVME_NIDT_UUID:
			if (cur->nidl != NVME_NIDT_UUID_LEN) {
838
				dev_warn(ctrl->device,
839 840 841 842 843
					 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_UUID_LEN;
844
			uuid_copy(uuid, data + pos + sizeof(*cur));
845 846 847 848 849 850 851 852 853 854 855 856 857 858
			break;
		default:
			/* Skip unnkown types */
			len = cur->nidl;
			break;
		}

		len += sizeof(*cur);
	}
free_data:
	kfree(data);
	return status;
}

859 860 861 862 863
static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
{
	struct nvme_command c = { };

	c.identify.opcode = nvme_admin_identify;
864
	c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
865 866 867 868
	c.identify.nsid = cpu_to_le32(nsid);
	return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
}

869 870
static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
		unsigned nsid)
871
{
872
	struct nvme_id_ns *id;
873 874 875 876
	struct nvme_command c = { };
	int error;

	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
877 878
	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
879
	c.identify.cns = NVME_ID_CNS_NS;
880

881 882 883
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return NULL;
884

885 886 887 888 889 890 891 892
	error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
	if (error) {
		dev_warn(ctrl->device, "Identify namespace failed\n");
		kfree(id);
		return NULL;
	}

	return id;
893 894
}

K
Keith Busch 已提交
895
static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
896
		      void *buffer, size_t buflen, u32 *result)
897 898
{
	struct nvme_command c;
899
	union nvme_result res;
900
	int ret;
901 902 903 904 905 906

	memset(&c, 0, sizeof(c));
	c.features.opcode = nvme_admin_set_features;
	c.features.fid = cpu_to_le32(fid);
	c.features.dword11 = cpu_to_le32(dword11);

907
	ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
908
			buffer, buflen, 0, NVME_QID_ANY, 0, 0);
909
	if (ret >= 0 && result)
910
		*result = le32_to_cpu(res.u32);
911
	return ret;
912 913
}

C
Christoph Hellwig 已提交
914 915 916 917 918 919
int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
{
	u32 q_count = (*count - 1) | ((*count - 1) << 16);
	u32 result;
	int status, nr_io_queues;

920
	status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
C
Christoph Hellwig 已提交
921
			&result);
922
	if (status < 0)
C
Christoph Hellwig 已提交
923 924
		return status;

925 926 927 928 929 930
	/*
	 * Degraded controllers might return an error when setting the queue
	 * count.  We still want to be able to bring them online and offer
	 * access to the admin queue, as that might be only way to fix them up.
	 */
	if (status > 0) {
931
		dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
932 933 934 935 936 937
		*count = 0;
	} else {
		nr_io_queues = min(result & 0xffff, result >> 16) + 1;
		*count = min(*count, nr_io_queues);
	}

C
Christoph Hellwig 已提交
938 939
	return 0;
}
940
EXPORT_SYMBOL_GPL(nvme_set_queue_count);
C
Christoph Hellwig 已提交
941

942 943 944 945 946 947 948 949 950
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
{
	struct nvme_user_io io;
	struct nvme_command c;
	unsigned length, meta_len;
	void __user *metadata;

	if (copy_from_user(&io, uio, sizeof(io)))
		return -EFAULT;
951 952
	if (io.flags)
		return -EINVAL;
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986

	switch (io.opcode) {
	case nvme_cmd_write:
	case nvme_cmd_read:
	case nvme_cmd_compare:
		break;
	default:
		return -EINVAL;
	}

	length = (io.nblocks + 1) << ns->lba_shift;
	meta_len = (io.nblocks + 1) * ns->ms;
	metadata = (void __user *)(uintptr_t)io.metadata;

	if (ns->ext) {
		length += meta_len;
		meta_len = 0;
	} else if (meta_len) {
		if ((io.metadata & 3) || !io.metadata)
			return -EINVAL;
	}

	memset(&c, 0, sizeof(c));
	c.rw.opcode = io.opcode;
	c.rw.flags = io.flags;
	c.rw.nsid = cpu_to_le32(ns->ns_id);
	c.rw.slba = cpu_to_le64(io.slba);
	c.rw.length = cpu_to_le16(io.nblocks);
	c.rw.control = cpu_to_le16(io.control);
	c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
	c.rw.reftag = cpu_to_le32(io.reftag);
	c.rw.apptag = cpu_to_le16(io.apptag);
	c.rw.appmask = cpu_to_le16(io.appmask);

987
	return nvme_submit_user_cmd(ns->queue, &c,
988 989 990 991
			(void __user *)(uintptr_t)io.addr, length,
			metadata, meta_len, io.slba, NULL, 0);
}

992
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
993 994 995 996 997 998 999 1000 1001 1002 1003
			struct nvme_passthru_cmd __user *ucmd)
{
	struct nvme_passthru_cmd cmd;
	struct nvme_command c;
	unsigned timeout = 0;
	int status;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
		return -EFAULT;
1004 1005
	if (cmd.flags)
		return -EINVAL;
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023

	memset(&c, 0, sizeof(c));
	c.common.opcode = cmd.opcode;
	c.common.flags = cmd.flags;
	c.common.nsid = cpu_to_le32(cmd.nsid);
	c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
	c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
	c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
	c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
	c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
	c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
	c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
	c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);

	if (cmd.timeout_ms)
		timeout = msecs_to_jiffies(cmd.timeout_ms);

	status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1024
			(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1025 1026
			(void __user *)(uintptr_t)cmd.metadata, cmd.metadata,
			0, &cmd.result, timeout);
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
	if (status >= 0) {
		if (put_user(cmd.result, &ucmd->result))
			return -EFAULT;
	}

	return status;
}

static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
{
	struct nvme_ns *ns = bdev->bd_disk->private_data;

	switch (cmd) {
	case NVME_IOCTL_ID:
		force_successful_syscall_return();
		return ns->ns_id;
	case NVME_IOCTL_ADMIN_CMD:
		return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
	case NVME_IOCTL_IO_CMD:
		return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
	case NVME_IOCTL_SUBMIT_IO:
		return nvme_submit_io(ns, (void __user *)arg);
	default:
1051 1052 1053 1054
#ifdef CONFIG_NVM
		if (ns->ndev)
			return nvme_nvm_ioctl(ns, cmd, arg);
#endif
1055
		if (is_sed_ioctl(cmd))
1056
			return sed_ioctl(ns->ctrl->opal_dev, cmd,
1057
					 (void __user *) arg);
1058 1059 1060 1061 1062 1063
		return -ENOTTY;
	}
}

static int nvme_open(struct block_device *bdev, fmode_t mode)
{
C
Christoph Hellwig 已提交
1064 1065 1066 1067 1068
	struct nvme_ns *ns = bdev->bd_disk->private_data;

	if (!kref_get_unless_zero(&ns->kref))
		return -ENXIO;
	return 0;
1069 1070 1071 1072
}

static void nvme_release(struct gendisk *disk, fmode_t mode)
{
1073
	nvme_put_ns(disk->private_data);
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
}

static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	/* some standard values */
	geo->heads = 1 << 6;
	geo->sectors = 1 << 5;
	geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
	return 0;
}

#ifdef CONFIG_BLK_DEV_INTEGRITY
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
static void nvme_prep_integrity(struct gendisk *disk, struct nvme_id_ns *id,
		u16 bs)
{
	struct nvme_ns *ns = disk->private_data;
	u16 old_ms = ns->ms;
	u8 pi_type = 0;

	ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
	ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);

	/* PI implementation requires metadata equal t10 pi tuple size */
	if (ns->ms == sizeof(struct t10_pi_tuple))
		pi_type = id->dps & NVME_NS_DPS_PI_MASK;

	if (blk_get_integrity(disk) &&
	    (ns->pi_type != pi_type || ns->ms != old_ms ||
	     bs != queue_logical_block_size(disk->queue) ||
	     (ns->ms && ns->ext)))
		blk_integrity_unregister(disk);

	ns->pi_type = pi_type;
}

1109 1110 1111 1112
static void nvme_init_integrity(struct nvme_ns *ns)
{
	struct blk_integrity integrity;

1113
	memset(&integrity, 0, sizeof(integrity));
1114 1115 1116
	switch (ns->pi_type) {
	case NVME_NS_DPS_PI_TYPE3:
		integrity.profile = &t10_pi_type3_crc;
1117 1118
		integrity.tag_size = sizeof(u16) + sizeof(u32);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1119 1120 1121 1122
		break;
	case NVME_NS_DPS_PI_TYPE1:
	case NVME_NS_DPS_PI_TYPE2:
		integrity.profile = &t10_pi_type1_crc;
1123 1124
		integrity.tag_size = sizeof(u16);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
		break;
	default:
		integrity.profile = NULL;
		break;
	}
	integrity.tuple_size = ns->ms;
	blk_integrity_register(ns->disk, &integrity);
	blk_queue_max_integrity_segments(ns->queue, 1);
}
#else
1135 1136 1137 1138
static void nvme_prep_integrity(struct gendisk *disk, struct nvme_id_ns *id,
		u16 bs)
{
}
1139 1140 1141 1142 1143
static void nvme_init_integrity(struct nvme_ns *ns)
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

1144 1145 1146 1147 1148 1149
static void nvme_set_chunk_size(struct nvme_ns *ns)
{
	u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
	blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
}

1150 1151
static void nvme_config_discard(struct nvme_ns *ns)
{
1152
	struct nvme_ctrl *ctrl = ns->ctrl;
1153
	u32 logical_block_size = queue_logical_block_size(ns->queue);
1154

1155 1156 1157
	BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
			NVME_DSM_MAX_RANGES);

1158 1159 1160 1161 1162 1163 1164 1165 1166
	if (ctrl->nr_streams && ns->sws && ns->sgs) {
		unsigned int sz = logical_block_size * ns->sws * ns->sgs;

		ns->queue->limits.discard_alignment = sz;
		ns->queue->limits.discard_granularity = sz;
	} else {
		ns->queue->limits.discard_alignment = logical_block_size;
		ns->queue->limits.discard_granularity = logical_block_size;
	}
1167
	blk_queue_max_discard_sectors(ns->queue, UINT_MAX);
1168
	blk_queue_max_discard_segments(ns->queue, NVME_DSM_MAX_RANGES);
1169
	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
1170 1171 1172

	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
		blk_queue_max_write_zeroes_sectors(ns->queue, UINT_MAX);
1173 1174
}

1175 1176
static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
		struct nvme_id_ns *id, u8 *eui64, u8 *nguid, uuid_t *uuid)
1177
{
1178 1179 1180 1181 1182
	if (ctrl->vs >= NVME_VS(1, 1, 0))
		memcpy(eui64, id->eui64, sizeof(id->eui64));
	if (ctrl->vs >= NVME_VS(1, 2, 0))
		memcpy(nguid, id->nguid, sizeof(id->nguid));
	if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1183 1184 1185
		 /* Don't treat error as fatal we potentially
		  * already have a NGUID or EUI-64
		  */
1186 1187
		if (nvme_identify_ns_descs(ctrl, nsid, eui64, nguid, uuid))
			dev_warn(ctrl->device,
1188 1189
				 "%s: Identify Descriptors failed\n", __func__);
	}
1190 1191 1192 1193 1194
}

static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
{
	struct nvme_ns *ns = disk->private_data;
1195
	struct nvme_ctrl *ctrl = ns->ctrl;
1196
	u16 bs;
1197 1198 1199 1200 1201

	/*
	 * If identify namespace failed, use default 512 byte block size so
	 * block layer can use before failing read/write for 0 capacity.
	 */
1202
	ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1203 1204 1205
	if (ns->lba_shift == 0)
		ns->lba_shift = 9;
	bs = 1 << ns->lba_shift;
1206
	ns->noiob = le16_to_cpu(id->noiob);
1207 1208 1209

	blk_mq_freeze_queue(disk->queue);

1210
	if (ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)
1211
		nvme_prep_integrity(disk, id, bs);
1212
	blk_queue_logical_block_size(ns->queue, bs);
1213 1214
	if (ns->noiob)
		nvme_set_chunk_size(ns);
K
Keith Busch 已提交
1215
	if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
1216 1217 1218 1219 1220 1221
		nvme_init_integrity(ns);
	if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
		set_capacity(disk, 0);
	else
		set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));

1222
	if (ctrl->oncs & NVME_CTRL_ONCS_DSM)
1223 1224
		nvme_config_discard(ns);
	blk_mq_unfreeze_queue(disk->queue);
1225
}
1226

1227 1228 1229
static int nvme_revalidate_disk(struct gendisk *disk)
{
	struct nvme_ns *ns = disk->private_data;
1230 1231
	struct nvme_ctrl *ctrl = ns->ctrl;
	struct nvme_id_ns *id;
1232 1233
	u8 eui64[8] = { 0 }, nguid[16] = { 0 };
	uuid_t uuid = uuid_null;
1234
	int ret = 0;
1235 1236 1237 1238 1239 1240

	if (test_bit(NVME_NS_DEAD, &ns->flags)) {
		set_capacity(disk, 0);
		return -ENODEV;
	}

1241 1242 1243
	id = nvme_identify_ns(ctrl, ns->ns_id);
	if (!id)
		return -ENODEV;
1244

1245 1246 1247 1248
	if (id->ncap == 0) {
		ret = -ENODEV;
		goto out;
	}
1249

1250 1251 1252 1253 1254 1255 1256 1257 1258
	nvme_report_ns_ids(ctrl, ns->ns_id, id, eui64, nguid, &uuid);
	if (!uuid_equal(&ns->uuid, &uuid) ||
	    memcmp(&ns->nguid, &nguid, sizeof(ns->nguid)) ||
	    memcmp(&ns->eui, &eui64, sizeof(ns->eui))) {
		dev_err(ctrl->device,
			"identifiers changed for nsid %d\n", ns->ns_id);
		ret = -ENODEV;
	}

1259 1260 1261
out:
	kfree(id);
	return ret;
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
}

static char nvme_pr_type(enum pr_type type)
{
	switch (type) {
	case PR_WRITE_EXCLUSIVE:
		return 1;
	case PR_EXCLUSIVE_ACCESS:
		return 2;
	case PR_WRITE_EXCLUSIVE_REG_ONLY:
		return 3;
	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
		return 4;
	case PR_WRITE_EXCLUSIVE_ALL_REGS:
		return 5;
	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
		return 6;
	default:
		return 0;
	}
};

static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
				u64 key, u64 sa_key, u8 op)
{
	struct nvme_ns *ns = bdev->bd_disk->private_data;
	struct nvme_command c;
	u8 data[16] = { 0, };

	put_unaligned_le64(key, &data[0]);
	put_unaligned_le64(sa_key, &data[8]);

	memset(&c, 0, sizeof(c));
	c.common.opcode = op;
	c.common.nsid = cpu_to_le32(ns->ns_id);
	c.common.cdw10[0] = cpu_to_le32(cdw10);

	return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
}

static int nvme_pr_register(struct block_device *bdev, u64 old,
		u64 new, unsigned flags)
{
	u32 cdw10;

	if (flags & ~PR_FL_IGNORE_KEY)
		return -EOPNOTSUPP;

	cdw10 = old ? 2 : 0;
	cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
	cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
	return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
}

static int nvme_pr_reserve(struct block_device *bdev, u64 key,
		enum pr_type type, unsigned flags)
{
	u32 cdw10;

	if (flags & ~PR_FL_IGNORE_KEY)
		return -EOPNOTSUPP;

	cdw10 = nvme_pr_type(type) << 8;
	cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
}

static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
		enum pr_type type, bool abort)
{
	u32 cdw10 = nvme_pr_type(type) << 8 | abort ? 2 : 1;
	return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
}

static int nvme_pr_clear(struct block_device *bdev, u64 key)
{
1338
	u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
}

static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
{
	u32 cdw10 = nvme_pr_type(type) << 8 | key ? 1 << 3 : 0;
	return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
}

static const struct pr_ops nvme_pr_ops = {
	.pr_register	= nvme_pr_register,
	.pr_reserve	= nvme_pr_reserve,
	.pr_release	= nvme_pr_release,
	.pr_preempt	= nvme_pr_preempt,
	.pr_clear	= nvme_pr_clear,
};

1356
#ifdef CONFIG_BLK_SED_OPAL
1357 1358
int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
		bool send)
1359
{
1360
	struct nvme_ctrl *ctrl = data;
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
	struct nvme_command cmd;

	memset(&cmd, 0, sizeof(cmd));
	if (send)
		cmd.common.opcode = nvme_admin_security_send;
	else
		cmd.common.opcode = nvme_admin_security_recv;
	cmd.common.nsid = 0;
	cmd.common.cdw10[0] = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
	cmd.common.cdw10[1] = cpu_to_le32(len);

	return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
				      ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0);
}
EXPORT_SYMBOL_GPL(nvme_sec_submit);
#endif /* CONFIG_BLK_SED_OPAL */

1378
static const struct block_device_operations nvme_fops = {
1379 1380
	.owner		= THIS_MODULE,
	.ioctl		= nvme_ioctl,
1381
	.compat_ioctl	= nvme_ioctl,
1382 1383 1384 1385 1386 1387 1388
	.open		= nvme_open,
	.release	= nvme_release,
	.getgeo		= nvme_getgeo,
	.revalidate_disk= nvme_revalidate_disk,
	.pr_ops		= &nvme_pr_ops,
};

1389 1390 1391 1392 1393 1394 1395 1396
static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
{
	unsigned long timeout =
		((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
	u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
	int ret;

	while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
K
Keith Busch 已提交
1397 1398
		if (csts == ~0)
			return -ENODEV;
1399 1400 1401 1402 1403 1404 1405
		if ((csts & NVME_CSTS_RDY) == bit)
			break;

		msleep(100);
		if (fatal_signal_pending(current))
			return -EINTR;
		if (time_after(jiffies, timeout)) {
1406
			dev_err(ctrl->device,
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431
				"Device not ready; aborting %s\n", enabled ?
						"initialisation" : "reset");
			return -ENODEV;
		}
	}

	return ret;
}

/*
 * If the device has been passed off to us in an enabled state, just clear
 * the enabled bit.  The spec says we should set the 'shutdown notification
 * bits', but doing so may cause the device to complete commands to the
 * admin queue ... and we don't know what memory that might be pointing at!
 */
int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
{
	int ret;

	ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
	ctrl->ctrl_config &= ~NVME_CC_ENABLE;

	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
	if (ret)
		return ret;
1432

1433
	if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1434 1435
		msleep(NVME_QUIRK_DELAY_AMOUNT);

1436 1437
	return nvme_wait_ready(ctrl, cap, false);
}
1438
EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450

int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
{
	/*
	 * Default to a 4K page size, with the intention to update this
	 * path in the future to accomodate architectures with differing
	 * kernel and IO page sizes.
	 */
	unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
	int ret;

	if (page_shift < dev_page_min) {
1451
		dev_err(ctrl->device,
1452 1453 1454 1455 1456 1457 1458 1459 1460
			"Minimum device page size %u too large for host (%u)\n",
			1 << dev_page_min, 1 << page_shift);
		return -ENODEV;
	}

	ctrl->page_size = 1 << page_shift;

	ctrl->ctrl_config = NVME_CC_CSS_NVM;
	ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
1461
	ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1462 1463 1464 1465 1466 1467 1468 1469
	ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
	ctrl->ctrl_config |= NVME_CC_ENABLE;

	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
	if (ret)
		return ret;
	return nvme_wait_ready(ctrl, cap, true);
}
1470
EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1471 1472 1473

int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
{
1474
	unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
	u32 csts;
	int ret;

	ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
	ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;

	ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
	if (ret)
		return ret;

	while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
		if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
			break;

		msleep(100);
		if (fatal_signal_pending(current))
			return -EINTR;
		if (time_after(jiffies, timeout)) {
1493
			dev_err(ctrl->device,
1494 1495 1496 1497 1498 1499 1500
				"Device shutdown incomplete; abort shutdown\n");
			return -ENODEV;
		}
	}

	return ret;
}
1501
EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1502

1503 1504 1505
static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
		struct request_queue *q)
{
1506 1507
	bool vwc = false;

1508
	if (ctrl->max_hw_sectors) {
1509 1510 1511
		u32 max_segments =
			(ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;

1512
		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1513
		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1514
	}
K
Keith Busch 已提交
1515 1516
	if (ctrl->quirks & NVME_QUIRK_STRIPE_SIZE)
		blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
1517
	blk_queue_virt_boundary(q, ctrl->page_size - 1);
1518 1519 1520
	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
		vwc = true;
	blk_queue_write_cache(q, vwc, vwc);
1521 1522
}

1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
{
	__le64 ts;
	int ret;

	if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
		return 0;

	ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
	ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
			NULL);
	if (ret)
		dev_warn_once(ctrl->device,
			"could not set timestamp (%d)\n", ret);
	return ret;
}

1540
static int nvme_configure_apst(struct nvme_ctrl *ctrl)
1541 1542 1543 1544 1545 1546 1547 1548
{
	/*
	 * APST (Autonomous Power State Transition) lets us program a
	 * table of power state transitions that the controller will
	 * perform automatically.  We configure it with a simple
	 * heuristic: we are willing to spend at most 2% of the time
	 * transitioning between power states.  Therefore, when running
	 * in any given state, we will enter the next lower-power
A
Andy Lutomirski 已提交
1549
	 * non-operational state after waiting 50 * (enlat + exlat)
1550
	 * microseconds, as long as that state's exit latency is under
1551 1552 1553 1554 1555 1556 1557 1558 1559
	 * the requested maximum latency.
	 *
	 * We will not autonomously enter any non-operational state for
	 * which the total latency exceeds ps_max_latency_us.  Users
	 * can set ps_max_latency_us to zero to turn off APST.
	 */

	unsigned apste;
	struct nvme_feat_auto_pst *table;
1560 1561
	u64 max_lat_us = 0;
	int max_ps = -1;
1562 1563 1564 1565 1566 1567 1568
	int ret;

	/*
	 * If APST isn't supported or if we haven't been initialized yet,
	 * then don't do anything.
	 */
	if (!ctrl->apsta)
1569
		return 0;
1570 1571 1572

	if (ctrl->npss > 31) {
		dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
1573
		return 0;
1574 1575 1576 1577
	}

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
1578
		return 0;
1579

1580
	if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
1581 1582
		/* Turn off APST. */
		apste = 0;
1583
		dev_dbg(ctrl->device, "APST disabled\n");
1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594
	} else {
		__le64 target = cpu_to_le64(0);
		int state;

		/*
		 * Walk through all states from lowest- to highest-power.
		 * According to the spec, lower-numbered states use more
		 * power.  NPSS, despite the name, is the index of the
		 * lowest-power state, not the number of states.
		 */
		for (state = (int)ctrl->npss; state >= 0; state--) {
1595
			u64 total_latency_us, exit_latency_us, transition_ms;
1596 1597 1598 1599

			if (target)
				table->entries[state] = target;

1600 1601 1602 1603 1604 1605 1606 1607
			/*
			 * Don't allow transitions to the deepest state
			 * if it's quirked off.
			 */
			if (state == ctrl->npss &&
			    (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
				continue;

1608 1609 1610 1611 1612 1613 1614 1615
			/*
			 * Is this state a useful non-operational state for
			 * higher-power states to autonomously transition to?
			 */
			if (!(ctrl->psd[state].flags &
			      NVME_PS_FLAGS_NON_OP_STATE))
				continue;

1616 1617 1618
			exit_latency_us =
				(u64)le32_to_cpu(ctrl->psd[state].exit_lat);
			if (exit_latency_us > ctrl->ps_max_latency_us)
1619 1620
				continue;

1621 1622 1623 1624
			total_latency_us =
				exit_latency_us +
				le32_to_cpu(ctrl->psd[state].entry_lat);

1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
			/*
			 * This state is good.  Use it as the APST idle
			 * target for higher power states.
			 */
			transition_ms = total_latency_us + 19;
			do_div(transition_ms, 20);
			if (transition_ms > (1 << 24) - 1)
				transition_ms = (1 << 24) - 1;

			target = cpu_to_le64((state << 3) |
					     (transition_ms << 8));
1636 1637 1638 1639 1640 1641

			if (max_ps == -1)
				max_ps = state;

			if (total_latency_us > max_lat_us)
				max_lat_us = total_latency_us;
1642 1643 1644
		}

		apste = 1;
1645 1646 1647 1648 1649 1650 1651

		if (max_ps == -1) {
			dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
		} else {
			dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
				max_ps, max_lat_us, (int)sizeof(*table), table);
		}
1652 1653 1654 1655 1656 1657 1658 1659
	}

	ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
				table, sizeof(*table), NULL);
	if (ret)
		dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);

	kfree(table);
1660
	return ret;
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683
}

static void nvme_set_latency_tolerance(struct device *dev, s32 val)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	u64 latency;

	switch (val) {
	case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
	case PM_QOS_LATENCY_ANY:
		latency = U64_MAX;
		break;

	default:
		latency = val;
	}

	if (ctrl->ps_max_latency_us != latency) {
		ctrl->ps_max_latency_us = latency;
		nvme_configure_apst(ctrl);
	}
}

1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
struct nvme_core_quirk_entry {
	/*
	 * NVMe model and firmware strings are padded with spaces.  For
	 * simplicity, strings in the quirk table are padded with NULLs
	 * instead.
	 */
	u16 vid;
	const char *mn;
	const char *fr;
	unsigned long quirks;
};

static const struct nvme_core_quirk_entry core_quirks[] = {
1697
	{
1698 1699 1700 1701 1702 1703
		/*
		 * This Toshiba device seems to die using any APST states.  See:
		 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11
		 */
		.vid = 0x1179,
		.mn = "THNSF5256GPUK TOSHIBA",
1704
		.quirks = NVME_QUIRK_NO_APST,
1705
	}
1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
};

/* match is null-terminated but idstr is space-padded. */
static bool string_matches(const char *idstr, const char *match, size_t len)
{
	size_t matchlen;

	if (!match)
		return true;

	matchlen = strlen(match);
	WARN_ON_ONCE(matchlen > len);

	if (memcmp(idstr, match, matchlen))
		return false;

	for (; matchlen < len; matchlen++)
		if (idstr[matchlen] != ' ')
			return false;

	return true;
}

static bool quirk_matches(const struct nvme_id_ctrl *id,
			  const struct nvme_core_quirk_entry *q)
{
	return q->vid == le16_to_cpu(id->vid) &&
		string_matches(id->mn, q->mn, sizeof(id->mn)) &&
		string_matches(id->fr, q->fr, sizeof(id->fr));
}

1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
static void nvme_init_subnqn(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
{
	size_t nqnlen;
	int off;

	nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
	if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
		strcpy(ctrl->subnqn, id->subnqn);
		return;
	}

	if (ctrl->vs >= NVME_VS(1, 2, 1))
		dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");

	/* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
	off = snprintf(ctrl->subnqn, NVMF_NQN_SIZE,
			"nqn.2014.08.org.nvmexpress:%4x%4x",
			le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
	memcpy(ctrl->subnqn + off, id->sn, sizeof(id->sn));
	off += sizeof(id->sn);
	memcpy(ctrl->subnqn + off, id->mn, sizeof(id->mn));
	off += sizeof(id->mn);
	memset(ctrl->subnqn + off, 0, sizeof(ctrl->subnqn) - off);
}

1762 1763 1764 1765 1766 1767 1768 1769 1770 1771
/*
 * Initialize the cached copies of the Identify data and various controller
 * register in our nvme_ctrl structure.  This should be called as soon as
 * the admin queue is fully up and running.
 */
int nvme_init_identify(struct nvme_ctrl *ctrl)
{
	struct nvme_id_ctrl *id;
	u64 cap;
	int ret, page_shift;
1772
	u32 max_hw_sectors;
1773
	bool prev_apst_enabled;
1774

1775 1776
	ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
	if (ret) {
1777
		dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
1778 1779 1780
		return ret;
	}

1781 1782
	ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
	if (ret) {
1783
		dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
1784 1785 1786 1787
		return ret;
	}
	page_shift = NVME_CAP_MPSMIN(cap) + 12;

1788
	if (ctrl->vs >= NVME_VS(1, 1, 0))
1789 1790
		ctrl->subsystem = NVME_CAP_NSSRC(cap);

1791 1792
	ret = nvme_identify_ctrl(ctrl, &id);
	if (ret) {
1793
		dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
1794 1795 1796
		return -EIO;
	}

1797 1798
	nvme_init_subnqn(ctrl, id);

1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
	if (!ctrl->identified) {
		/*
		 * Check for quirks.  Quirk can depend on firmware version,
		 * so, in principle, the set of quirks present can change
		 * across a reset.  As a possible future enhancement, we
		 * could re-scan for quirks every time we reinitialize
		 * the device, but we'd have to make sure that the driver
		 * behaves intelligently if the quirks change.
		 */

		int i;

		for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
			if (quirk_matches(id, &core_quirks[i]))
				ctrl->quirks |= core_quirks[i].quirks;
		}
	}

1817
	if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
1818
		dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
1819 1820 1821
		ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
	}

1822
	ctrl->oacs = le16_to_cpu(id->oacs);
1823
	ctrl->vid = le16_to_cpu(id->vid);
1824
	ctrl->oncs = le16_to_cpup(&id->oncs);
1825
	atomic_set(&ctrl->abort_limit, id->acl + 1);
1826
	ctrl->vwc = id->vwc;
M
Ming Lin 已提交
1827
	ctrl->cntlid = le16_to_cpup(&id->cntlid);
1828 1829 1830 1831
	memcpy(ctrl->serial, id->sn, sizeof(id->sn));
	memcpy(ctrl->model, id->mn, sizeof(id->mn));
	memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
	if (id->mdts)
1832
		max_hw_sectors = 1 << (id->mdts + page_shift - 9);
1833
	else
1834 1835 1836
		max_hw_sectors = UINT_MAX;
	ctrl->max_hw_sectors =
		min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
1837

1838
	nvme_set_queue_limits(ctrl, ctrl->admin_q);
1839
	ctrl->sgls = le32_to_cpu(id->sgls);
S
Sagi Grimberg 已提交
1840
	ctrl->kas = le16_to_cpu(id->kas);
1841

1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855
	if (id->rtd3e) {
		/* us -> s */
		u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;

		ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
						 shutdown_timeout, 60);

		if (ctrl->shutdown_timeout != shutdown_timeout)
			dev_warn(ctrl->device,
				 "Shutdown timeout set to %u seconds\n",
				 ctrl->shutdown_timeout);
	} else
		ctrl->shutdown_timeout = shutdown_timeout;

1856
	ctrl->npss = id->npss;
1857 1858
	ctrl->apsta = id->apsta;
	prev_apst_enabled = ctrl->apst_enabled;
1859 1860
	if (ctrl->quirks & NVME_QUIRK_NO_APST) {
		if (force_apst && id->apsta) {
1861
			dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
1862
			ctrl->apst_enabled = true;
1863
		} else {
1864
			ctrl->apst_enabled = false;
1865 1866
		}
	} else {
1867
		ctrl->apst_enabled = id->apsta;
1868
	}
1869 1870
	memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));

1871
	if (ctrl->ops->flags & NVME_F_FABRICS) {
1872 1873 1874 1875 1876 1877 1878 1879 1880
		ctrl->icdoff = le16_to_cpu(id->icdoff);
		ctrl->ioccsz = le32_to_cpu(id->ioccsz);
		ctrl->iorcsz = le32_to_cpu(id->iorcsz);
		ctrl->maxcmd = le16_to_cpu(id->maxcmd);

		/*
		 * In fabrics we need to verify the cntlid matches the
		 * admin connect
		 */
1881
		if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
1882
			ret = -EINVAL;
1883 1884
			goto out_free;
		}
S
Sagi Grimberg 已提交
1885 1886

		if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
1887
			dev_err(ctrl->device,
S
Sagi Grimberg 已提交
1888 1889
				"keep-alive support is mandatory for fabrics\n");
			ret = -EINVAL;
1890
			goto out_free;
S
Sagi Grimberg 已提交
1891
		}
1892 1893
	} else {
		ctrl->cntlid = le16_to_cpu(id->cntlid);
1894 1895
		ctrl->hmpre = le32_to_cpu(id->hmpre);
		ctrl->hmmin = le32_to_cpu(id->hmmin);
1896 1897
		ctrl->hmminds = le32_to_cpu(id->hmminds);
		ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
1898
	}
1899

1900
	kfree(id);
1901

1902
	if (ctrl->apst_enabled && !prev_apst_enabled)
1903
		dev_pm_qos_expose_latency_tolerance(ctrl->device);
1904
	else if (!ctrl->apst_enabled && prev_apst_enabled)
1905 1906
		dev_pm_qos_hide_latency_tolerance(ctrl->device);

1907 1908 1909
	ret = nvme_configure_apst(ctrl);
	if (ret < 0)
		return ret;
1910 1911 1912 1913
	
	ret = nvme_configure_timestamp(ctrl);
	if (ret < 0)
		return ret;
1914 1915 1916 1917

	ret = nvme_configure_directives(ctrl);
	if (ret < 0)
		return ret;
1918

1919
	ctrl->identified = true;
1920

1921 1922 1923 1924
	return 0;

out_free:
	kfree(id);
1925
	return ret;
1926
}
1927
EXPORT_SYMBOL_GPL(nvme_init_identify);
1928

1929
static int nvme_dev_open(struct inode *inode, struct file *file)
1930
{
1931 1932
	struct nvme_ctrl *ctrl =
		container_of(inode->i_cdev, struct nvme_ctrl, cdev);
1933

1934
	if (ctrl->state != NVME_CTRL_LIVE)
1935 1936
		return -EWOULDBLOCK;
	file->private_data = ctrl;
1937 1938 1939
	return 0;
}

1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952
static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
{
	struct nvme_ns *ns;
	int ret;

	mutex_lock(&ctrl->namespaces_mutex);
	if (list_empty(&ctrl->namespaces)) {
		ret = -ENOTTY;
		goto out_unlock;
	}

	ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
	if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
1953
		dev_warn(ctrl->device,
1954 1955 1956 1957 1958
			"NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
		ret = -EINVAL;
		goto out_unlock;
	}

1959
	dev_warn(ctrl->device,
1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972
		"using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
	kref_get(&ns->kref);
	mutex_unlock(&ctrl->namespaces_mutex);

	ret = nvme_user_cmd(ctrl, ns, argp);
	nvme_put_ns(ns);
	return ret;

out_unlock:
	mutex_unlock(&ctrl->namespaces_mutex);
	return ret;
}

1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
		unsigned long arg)
{
	struct nvme_ctrl *ctrl = file->private_data;
	void __user *argp = (void __user *)arg;

	switch (cmd) {
	case NVME_IOCTL_ADMIN_CMD:
		return nvme_user_cmd(ctrl, NULL, argp);
	case NVME_IOCTL_IO_CMD:
1983
		return nvme_dev_user_cmd(ctrl, argp);
1984
	case NVME_IOCTL_RESET:
1985
		dev_warn(ctrl->device, "resetting controller\n");
1986
		return nvme_reset_ctrl_sync(ctrl);
1987 1988
	case NVME_IOCTL_SUBSYS_RESET:
		return nvme_reset_subsystem(ctrl);
K
Keith Busch 已提交
1989 1990 1991
	case NVME_IOCTL_RESCAN:
		nvme_queue_scan(ctrl);
		return 0;
1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
	default:
		return -ENOTTY;
	}
}

static const struct file_operations nvme_dev_fops = {
	.owner		= THIS_MODULE,
	.open		= nvme_dev_open,
	.unlocked_ioctl	= nvme_dev_ioctl,
	.compat_ioctl	= nvme_dev_ioctl,
};

static ssize_t nvme_sysfs_reset(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	int ret;

2011
	ret = nvme_reset_ctrl_sync(ctrl);
2012 2013 2014
	if (ret < 0)
		return ret;
	return count;
2015
}
2016
static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2017

K
Keith Busch 已提交
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028
static ssize_t nvme_sysfs_rescan(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	nvme_queue_scan(ctrl);
	return count;
}
static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);

2029 2030 2031
static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
								char *buf)
{
2032
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2033 2034 2035 2036
	struct nvme_ctrl *ctrl = ns->ctrl;
	int serial_len = sizeof(ctrl->serial);
	int model_len = sizeof(ctrl->model);

2037 2038 2039
	if (!uuid_is_null(&ns->uuid))
		return sprintf(buf, "uuid.%pU\n", &ns->uuid);

2040 2041
	if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
		return sprintf(buf, "eui.%16phN\n", ns->nguid);
2042 2043 2044 2045

	if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
		return sprintf(buf, "eui.%8phN\n", ns->eui);

2046 2047
	while (serial_len > 0 && (ctrl->serial[serial_len - 1] == ' ' ||
				  ctrl->serial[serial_len - 1] == '\0'))
2048
		serial_len--;
2049 2050
	while (model_len > 0 && (ctrl->model[model_len - 1] == ' ' ||
				 ctrl->model[model_len - 1] == '\0'))
2051 2052 2053 2054 2055 2056 2057
		model_len--;

	return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,
		serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id);
}
static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);

2058 2059 2060 2061 2062 2063 2064 2065
static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
	return sprintf(buf, "%pU\n", ns->nguid);
}
static DEVICE_ATTR(nguid, S_IRUGO, nguid_show, NULL);

2066 2067 2068
static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
								char *buf)
{
2069
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2070 2071 2072 2073 2074 2075 2076 2077 2078 2079

	/* For backward compatibility expose the NGUID to userspace if
	 * we have no UUID set
	 */
	if (uuid_is_null(&ns->uuid)) {
		printk_ratelimited(KERN_WARNING
				   "No UUID available providing old NGUID\n");
		return sprintf(buf, "%pU\n", ns->nguid);
	}
	return sprintf(buf, "%pU\n", &ns->uuid);
2080 2081 2082 2083 2084 2085
}
static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);

static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
								char *buf)
{
2086
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2087 2088 2089 2090 2091 2092 2093
	return sprintf(buf, "%8phd\n", ns->eui);
}
static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);

static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
								char *buf)
{
2094
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2095 2096 2097 2098 2099
	return sprintf(buf, "%d\n", ns->ns_id);
}
static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);

static struct attribute *nvme_ns_attrs[] = {
2100
	&dev_attr_wwid.attr,
2101
	&dev_attr_uuid.attr,
2102
	&dev_attr_nguid.attr,
2103 2104 2105 2106 2107
	&dev_attr_eui.attr,
	&dev_attr_nsid.attr,
	NULL,
};

M
Ming Lin 已提交
2108
static umode_t nvme_ns_attrs_are_visible(struct kobject *kobj,
2109 2110 2111
		struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
2112
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2113 2114

	if (a == &dev_attr_uuid.attr) {
2115 2116 2117 2118 2119
		if (uuid_is_null(&ns->uuid) ||
		    !memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
			return 0;
	}
	if (a == &dev_attr_nguid.attr) {
2120
		if (!memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131
			return 0;
	}
	if (a == &dev_attr_eui.attr) {
		if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
			return 0;
	}
	return a->mode;
}

static const struct attribute_group nvme_ns_attr_group = {
	.attrs		= nvme_ns_attrs,
M
Ming Lin 已提交
2132
	.is_visible	= nvme_ns_attrs_are_visible,
2133 2134
};

M
Ming Lin 已提交
2135
#define nvme_show_str_function(field)						\
2136 2137 2138 2139 2140 2141 2142 2143
static ssize_t  field##_show(struct device *dev,				\
			    struct device_attribute *attr, char *buf)		\
{										\
        struct nvme_ctrl *ctrl = dev_get_drvdata(dev);				\
        return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field);	\
}										\
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);

M
Ming Lin 已提交
2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156
#define nvme_show_int_function(field)						\
static ssize_t  field##_show(struct device *dev,				\
			    struct device_attribute *attr, char *buf)		\
{										\
        struct nvme_ctrl *ctrl = dev_get_drvdata(dev);				\
        return sprintf(buf, "%d\n", ctrl->field);	\
}										\
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);

nvme_show_str_function(model);
nvme_show_str_function(serial);
nvme_show_str_function(firmware_rev);
nvme_show_int_function(cntlid);
2157

M
Ming Lin 已提交
2158 2159 2160 2161 2162 2163 2164
static ssize_t nvme_sysfs_delete(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	if (device_remove_file_self(dev, attr))
2165
		nvme_delete_ctrl_sync(ctrl);
M
Ming Lin 已提交
2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179
	return count;
}
static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);

static ssize_t nvme_sysfs_show_transport(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
}
static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);

2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
static ssize_t nvme_sysfs_show_state(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
	static const char *const state_name[] = {
		[NVME_CTRL_NEW]		= "new",
		[NVME_CTRL_LIVE]	= "live",
		[NVME_CTRL_RESETTING]	= "resetting",
		[NVME_CTRL_RECONNECTING]= "reconnecting",
		[NVME_CTRL_DELETING]	= "deleting",
		[NVME_CTRL_DEAD]	= "dead",
	};

	if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&
	    state_name[ctrl->state])
		return sprintf(buf, "%s\n", state_name[ctrl->state]);

	return sprintf(buf, "unknown state\n");
}

static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);

M
Ming Lin 已提交
2203 2204 2205 2206 2207 2208
static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

2209
	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subnqn);
M
Ming Lin 已提交
2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222
}
static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);

static ssize_t nvme_sysfs_show_address(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

	return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
}
static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);

2223 2224
static struct attribute *nvme_dev_attrs[] = {
	&dev_attr_reset_controller.attr,
K
Keith Busch 已提交
2225
	&dev_attr_rescan_controller.attr,
2226 2227 2228
	&dev_attr_model.attr,
	&dev_attr_serial.attr,
	&dev_attr_firmware_rev.attr,
M
Ming Lin 已提交
2229
	&dev_attr_cntlid.attr,
M
Ming Lin 已提交
2230 2231 2232 2233
	&dev_attr_delete_controller.attr,
	&dev_attr_transport.attr,
	&dev_attr_subsysnqn.attr,
	&dev_attr_address.attr,
2234
	&dev_attr_state.attr,
2235 2236 2237
	NULL
};

M
Ming Lin 已提交
2238 2239 2240 2241 2242 2243
static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
		struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

2244 2245 2246 2247
	if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
		return 0;
	if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
		return 0;
M
Ming Lin 已提交
2248 2249 2250 2251

	return a->mode;
}

2252
static struct attribute_group nvme_dev_attrs_group = {
M
Ming Lin 已提交
2253 2254
	.attrs		= nvme_dev_attrs,
	.is_visible	= nvme_dev_attrs_are_visible,
2255 2256 2257 2258 2259 2260 2261
};

static const struct attribute_group *nvme_dev_attr_groups[] = {
	&nvme_dev_attrs_group,
	NULL,
};

2262 2263 2264 2265 2266 2267 2268 2269
static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
{
	struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
	struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);

	return nsa->ns_id - nsb->ns_id;
}

2270
static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
2271
{
2272
	struct nvme_ns *ns, *ret = NULL;
2273

2274
	mutex_lock(&ctrl->namespaces_mutex);
2275
	list_for_each_entry(ns, &ctrl->namespaces, list) {
2276
		if (ns->ns_id == nsid) {
2277 2278
			if (!kref_get_unless_zero(&ns->kref))
				continue;
2279 2280 2281
			ret = ns;
			break;
		}
2282 2283 2284
		if (ns->ns_id > nsid)
			break;
	}
2285 2286
	mutex_unlock(&ctrl->namespaces_mutex);
	return ret;
2287 2288
}

2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
{
	struct streams_directive_params s;
	int ret;

	if (!ctrl->nr_streams)
		return 0;

	ret = nvme_get_stream_params(ctrl, &s, ns->ns_id);
	if (ret)
		return ret;

	ns->sws = le32_to_cpu(s.sws);
	ns->sgs = le16_to_cpu(s.sgs);

	if (ns->sws) {
		unsigned int bs = 1 << ns->lba_shift;

		blk_queue_io_min(ns->queue, bs * ns->sws);
		if (ns->sgs)
			blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
	}

	return 0;
}

2315 2316 2317 2318
static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;
	struct gendisk *disk;
2319 2320
	struct nvme_id_ns *id;
	char disk_name[DISK_NAME_LEN];
2321 2322 2323 2324 2325 2326
	int node = dev_to_node(ctrl->dev);

	ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
	if (!ns)
		return;

2327 2328 2329 2330
	ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
	if (ns->instance < 0)
		goto out_free_ns;

2331 2332
	ns->queue = blk_mq_init_queue(ctrl->tagset);
	if (IS_ERR(ns->queue))
2333
		goto out_release_instance;
2334 2335 2336 2337 2338 2339 2340 2341 2342
	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
	ns->queue->queuedata = ns;
	ns->ctrl = ctrl;

	kref_init(&ns->kref);
	ns->ns_id = nsid;
	ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */

	blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
2343
	nvme_set_queue_limits(ctrl, ns->queue);
2344
	nvme_setup_streams_ns(ctrl, ns);
2345

2346
	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
2347

2348 2349
	id = nvme_identify_ns(ctrl, nsid);
	if (!id)
2350 2351
		goto out_free_queue;

2352 2353 2354 2355 2356
	if (id->ncap == 0)
		goto out_free_id;

	nvme_report_ns_ids(ctrl, ns->ns_id, id, ns->eui, ns->nguid, &ns->uuid);

C
Christoph Hellwig 已提交
2357 2358 2359 2360 2361
	if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
		if (nvme_nvm_register(ns, disk_name, node)) {
			dev_warn(ctrl->device, "LightNVM init failure\n");
			goto out_free_id;
		}
2362
	}
2363

2364 2365 2366
	disk = alloc_disk_node(0, node);
	if (!disk)
		goto out_free_id;
2367

2368 2369 2370 2371 2372 2373 2374 2375
	disk->fops = &nvme_fops;
	disk->private_data = ns;
	disk->queue = ns->queue;
	disk->flags = GENHD_FL_EXT_DEVT;
	memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
	ns->disk = disk;

	__nvme_revalidate_disk(disk, id);
2376

2377 2378 2379 2380
	mutex_lock(&ctrl->namespaces_mutex);
	list_add_tail(&ns->list, &ctrl->namespaces);
	mutex_unlock(&ctrl->namespaces_mutex);

2381
	nvme_get_ctrl(ctrl);
2382 2383 2384

	kfree(id);

2385
	device_add_disk(ctrl->device, ns->disk);
2386 2387 2388 2389
	if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
					&nvme_ns_attr_group))
		pr_warn("%s: failed to create sysfs group for identification\n",
			ns->disk->disk_name);
2390 2391 2392
	if (ns->ndev && nvme_nvm_register_sysfs(ns))
		pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
			ns->disk->disk_name);
2393
	return;
2394 2395
 out_free_id:
	kfree(id);
2396 2397
 out_free_queue:
	blk_cleanup_queue(ns->queue);
2398 2399
 out_release_instance:
	ida_simple_remove(&ctrl->ns_ida, ns->instance);
2400 2401 2402 2403 2404 2405
 out_free_ns:
	kfree(ns);
}

static void nvme_ns_remove(struct nvme_ns *ns)
{
2406 2407
	if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
		return;
2408

2409
	if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
2410 2411
		if (blk_get_integrity(ns->disk))
			blk_integrity_unregister(ns->disk);
2412 2413
		sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
					&nvme_ns_attr_group);
2414 2415
		if (ns->ndev)
			nvme_nvm_unregister_sysfs(ns);
2416 2417 2418
		del_gendisk(ns->disk);
		blk_cleanup_queue(ns->queue);
	}
2419 2420

	mutex_lock(&ns->ctrl->namespaces_mutex);
2421
	list_del_init(&ns->list);
2422 2423
	mutex_unlock(&ns->ctrl->namespaces_mutex);

2424 2425 2426
	nvme_put_ns(ns);
}

2427 2428 2429 2430
static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;

2431
	ns = nvme_find_get_ns(ctrl, nsid);
2432
	if (ns) {
2433
		if (ns->disk && revalidate_disk(ns->disk))
2434
			nvme_ns_remove(ns);
2435
		nvme_put_ns(ns);
2436 2437 2438 2439
	} else
		nvme_alloc_ns(ctrl, nsid);
}

2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
					unsigned nsid)
{
	struct nvme_ns *ns, *next;

	list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
		if (ns->ns_id > nsid)
			nvme_ns_remove(ns);
	}
}

2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
{
	struct nvme_ns *ns;
	__le32 *ns_list;
	unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024);
	int ret = 0;

	ns_list = kzalloc(0x1000, GFP_KERNEL);
	if (!ns_list)
		return -ENOMEM;

	for (i = 0; i < num_lists; i++) {
		ret = nvme_identify_ns_list(ctrl, prev, ns_list);
		if (ret)
2465
			goto free;
2466 2467 2468 2469 2470 2471 2472 2473 2474

		for (j = 0; j < min(nn, 1024U); j++) {
			nsid = le32_to_cpu(ns_list[j]);
			if (!nsid)
				goto out;

			nvme_validate_ns(ctrl, nsid);

			while (++prev < nsid) {
2475 2476
				ns = nvme_find_get_ns(ctrl, prev);
				if (ns) {
2477
					nvme_ns_remove(ns);
2478 2479
					nvme_put_ns(ns);
				}
2480 2481 2482 2483 2484
			}
		}
		nn -= j;
	}
 out:
2485 2486
	nvme_remove_invalid_namespaces(ctrl, prev);
 free:
2487 2488 2489 2490
	kfree(ns_list);
	return ret;
}

2491
static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
2492 2493 2494
{
	unsigned i;

2495 2496 2497
	for (i = 1; i <= nn; i++)
		nvme_validate_ns(ctrl, i);

2498
	nvme_remove_invalid_namespaces(ctrl, nn);
2499 2500
}

2501
static void nvme_scan_work(struct work_struct *work)
2502
{
2503 2504
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, scan_work);
2505
	struct nvme_id_ctrl *id;
2506
	unsigned nn;
2507

2508 2509 2510
	if (ctrl->state != NVME_CTRL_LIVE)
		return;

2511 2512
	if (nvme_identify_ctrl(ctrl, &id))
		return;
2513 2514

	nn = le32_to_cpu(id->nn);
2515
	if (ctrl->vs >= NVME_VS(1, 1, 0) &&
2516 2517 2518 2519
	    !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
		if (!nvme_scan_ns_list(ctrl, nn))
			goto done;
	}
2520
	nvme_scan_ns_sequential(ctrl, nn);
2521
 done:
2522
	mutex_lock(&ctrl->namespaces_mutex);
2523
	list_sort(NULL, &ctrl->namespaces, ns_cmp);
2524
	mutex_unlock(&ctrl->namespaces_mutex);
2525 2526
	kfree(id);
}
2527 2528 2529 2530 2531 2532 2533 2534

void nvme_queue_scan(struct nvme_ctrl *ctrl)
{
	/*
	 * Do not queue new scan work when a controller is reset during
	 * removal.
	 */
	if (ctrl->state == NVME_CTRL_LIVE)
2535
		queue_work(nvme_wq, &ctrl->scan_work);
2536 2537
}
EXPORT_SYMBOL_GPL(nvme_queue_scan);
2538

2539 2540 2541 2542 2543
/*
 * This function iterates the namespace list unlocked to allow recovery from
 * controller failure. It is up to the caller to ensure the namespace list is
 * not modified by scan work while this function is executing.
 */
2544 2545 2546 2547
void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns, *next;

2548 2549 2550 2551 2552 2553 2554 2555 2556
	/*
	 * The dead states indicates the controller was not gracefully
	 * disconnected. In that case, we won't be able to flush any data while
	 * removing the namespaces' disks; fail all the queues now to avoid
	 * potentially having to clean up the failed sync later.
	 */
	if (ctrl->state == NVME_CTRL_DEAD)
		nvme_kill_queues(ctrl);

2557 2558 2559
	list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
		nvme_ns_remove(ns);
}
2560
EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
2561

2562 2563 2564 2565 2566 2567
static void nvme_async_event_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, async_event_work);

	spin_lock_irq(&ctrl->lock);
2568
	while (ctrl->state == NVME_CTRL_LIVE && ctrl->event_limit > 0) {
2569 2570 2571 2572 2573 2574 2575 2576 2577
		int aer_idx = --ctrl->event_limit;

		spin_unlock_irq(&ctrl->lock);
		ctrl->ops->submit_async_event(ctrl, aer_idx);
		spin_lock_irq(&ctrl->lock);
	}
	spin_unlock_irq(&ctrl->lock);
}

2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601
static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
{

	u32 csts;

	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
		return false;

	if (csts == ~0)
		return false;

	return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
}

static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
{
	struct nvme_command c = { };
	struct nvme_fw_slot_info_log *log;

	log = kmalloc(sizeof(*log), GFP_KERNEL);
	if (!log)
		return;

	c.common.opcode = nvme_admin_get_log_page;
A
Arnav Dawn 已提交
2602
	c.common.nsid = cpu_to_le32(NVME_NSID_ALL);
2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642
	c.common.cdw10[0] = nvme_get_log_dw10(NVME_LOG_FW_SLOT, sizeof(*log));

	if (!nvme_submit_sync_cmd(ctrl->admin_q, &c, log, sizeof(*log)))
		dev_warn(ctrl->device,
				"Get FW SLOT INFO log error\n");
	kfree(log);
}

static void nvme_fw_act_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl = container_of(work,
				struct nvme_ctrl, fw_act_work);
	unsigned long fw_act_timeout;

	if (ctrl->mtfa)
		fw_act_timeout = jiffies +
				msecs_to_jiffies(ctrl->mtfa * 100);
	else
		fw_act_timeout = jiffies +
				msecs_to_jiffies(admin_timeout * 1000);

	nvme_stop_queues(ctrl);
	while (nvme_ctrl_pp_status(ctrl)) {
		if (time_after(jiffies, fw_act_timeout)) {
			dev_warn(ctrl->device,
				"Fw activation timeout, reset controller\n");
			nvme_reset_ctrl(ctrl);
			break;
		}
		msleep(100);
	}

	if (ctrl->state != NVME_CTRL_LIVE)
		return;

	nvme_start_queues(ctrl);
	/* read FW slot informationi to clear the AER*/
	nvme_get_fw_slot_info(ctrl);
}

2643 2644
void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
		union nvme_result *res)
2645
{
2646 2647
	u32 result = le32_to_cpu(res->u32);
	bool done = true;
2648

2649 2650 2651 2652 2653
	switch (le16_to_cpu(status) >> 1) {
	case NVME_SC_SUCCESS:
		done = false;
		/*FALLTHRU*/
	case NVME_SC_ABORT_REQ:
2654
		++ctrl->event_limit;
2655
		if (ctrl->state == NVME_CTRL_LIVE)
2656
			queue_work(nvme_wq, &ctrl->async_event_work);
2657 2658 2659
		break;
	default:
		break;
2660 2661
	}

2662
	if (done)
2663 2664 2665 2666 2667 2668 2669
		return;

	switch (result & 0xff07) {
	case NVME_AER_NOTICE_NS_CHANGED:
		dev_info(ctrl->device, "rescanning\n");
		nvme_queue_scan(ctrl);
		break;
2670
	case NVME_AER_NOTICE_FW_ACT_STARTING:
2671
		queue_work(nvme_wq, &ctrl->fw_act_work);
2672
		break;
2673 2674 2675 2676 2677 2678 2679 2680 2681
	default:
		dev_warn(ctrl->device, "async event result %08x\n", result);
	}
}
EXPORT_SYMBOL_GPL(nvme_complete_async_event);

void nvme_queue_async_events(struct nvme_ctrl *ctrl)
{
	ctrl->event_limit = NVME_NR_AERS;
2682
	queue_work(nvme_wq, &ctrl->async_event_work);
2683 2684 2685
}
EXPORT_SYMBOL_GPL(nvme_queue_async_events);

2686
void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
2687
{
2688
	nvme_stop_keep_alive(ctrl);
2689
	flush_work(&ctrl->async_event_work);
2690
	flush_work(&ctrl->scan_work);
2691
	cancel_work_sync(&ctrl->fw_act_work);
2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706
}
EXPORT_SYMBOL_GPL(nvme_stop_ctrl);

void nvme_start_ctrl(struct nvme_ctrl *ctrl)
{
	if (ctrl->kato)
		nvme_start_keep_alive(ctrl);

	if (ctrl->queue_count > 1) {
		nvme_queue_scan(ctrl);
		nvme_queue_async_events(ctrl);
		nvme_start_queues(ctrl);
	}
}
EXPORT_SYMBOL_GPL(nvme_start_ctrl);
2707

2708 2709
void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
{
2710
	cdev_device_del(&ctrl->cdev, ctrl->device);
2711
}
2712
EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
2713

2714
static void nvme_free_ctrl(struct device *dev)
2715
{
2716 2717
	struct nvme_ctrl *ctrl =
		container_of(dev, struct nvme_ctrl, ctrl_device);
2718

2719
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
2720
	ida_destroy(&ctrl->ns_ida);
2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734

	ctrl->ops->free_ctrl(ctrl);
}

/*
 * Initialize a NVMe controller structures.  This needs to be called during
 * earliest initialization so that we have the initialized structured around
 * during probing.
 */
int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
		const struct nvme_ctrl_ops *ops, unsigned long quirks)
{
	int ret;

2735 2736
	ctrl->state = NVME_CTRL_NEW;
	spin_lock_init(&ctrl->lock);
2737
	INIT_LIST_HEAD(&ctrl->namespaces);
2738
	mutex_init(&ctrl->namespaces_mutex);
2739 2740 2741
	ctrl->dev = dev;
	ctrl->ops = ops;
	ctrl->quirks = quirks;
2742
	INIT_WORK(&ctrl->scan_work, nvme_scan_work);
2743
	INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
2744
	INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
2745
	INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
2746

2747 2748
	ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
	if (ret < 0)
2749
		goto out;
2750
	ctrl->instance = ret;
2751

2752 2753
	device_initialize(&ctrl->ctrl_device);
	ctrl->device = &ctrl->ctrl_device;
2754
	ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
2755 2756 2757 2758 2759 2760 2761
	ctrl->device->class = nvme_class;
	ctrl->device->parent = ctrl->dev;
	ctrl->device->groups = nvme_dev_attr_groups;
	ctrl->device->release = nvme_free_ctrl;
	dev_set_drvdata(ctrl->device, ctrl);
	ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
	if (ret)
2762
		goto out_release_instance;
2763 2764 2765 2766

	cdev_init(&ctrl->cdev, &nvme_dev_fops);
	ctrl->cdev.owner = ops->module;
	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
2767 2768 2769
	if (ret)
		goto out_free_name;

2770
	ida_init(&ctrl->ns_ida);
2771

2772 2773 2774 2775 2776 2777 2778 2779
	/*
	 * Initialize latency tolerance controls.  The sysfs files won't
	 * be visible to userspace unless the device actually supports APST.
	 */
	ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
	dev_pm_qos_update_user_latency_tolerance(ctrl->device,
		min(default_ps_max_latency_us, (unsigned long)S32_MAX));

2780
	return 0;
2781 2782
out_free_name:
	kfree_const(dev->kobj.name);
2783
out_release_instance:
2784
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
2785 2786 2787
out:
	return ret;
}
2788
EXPORT_SYMBOL_GPL(nvme_init_ctrl);
2789

2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800
/**
 * nvme_kill_queues(): Ends all namespace queues
 * @ctrl: the dead controller that needs to end
 *
 * Call this function when the driver determines it is unable to get the
 * controller in a state capable of servicing IO.
 */
void nvme_kill_queues(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

2801
	mutex_lock(&ctrl->namespaces_mutex);
M
Ming Lei 已提交
2802

2803
	/* Forcibly unquiesce queues to avoid blocking dispatch */
2804 2805
	if (ctrl->admin_q)
		blk_mq_unquiesce_queue(ctrl->admin_q);
2806

2807
	list_for_each_entry(ns, &ctrl->namespaces, list) {
2808 2809 2810 2811
		/*
		 * Revalidating a dead namespace sets capacity to 0. This will
		 * end buffered writers dirtying pages that can't be synced.
		 */
2812 2813 2814
		if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
			continue;
		revalidate_disk(ns->disk);
2815
		blk_set_queue_dying(ns->queue);
2816

2817 2818
		/* Forcibly unquiesce queues to avoid blocking dispatch */
		blk_mq_unquiesce_queue(ns->queue);
2819
	}
2820
	mutex_unlock(&ctrl->namespaces_mutex);
2821
}
2822
EXPORT_SYMBOL_GPL(nvme_kill_queues);
2823

K
Keith Busch 已提交
2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865
void nvme_unfreeze(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

	mutex_lock(&ctrl->namespaces_mutex);
	list_for_each_entry(ns, &ctrl->namespaces, list)
		blk_mq_unfreeze_queue(ns->queue);
	mutex_unlock(&ctrl->namespaces_mutex);
}
EXPORT_SYMBOL_GPL(nvme_unfreeze);

void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
{
	struct nvme_ns *ns;

	mutex_lock(&ctrl->namespaces_mutex);
	list_for_each_entry(ns, &ctrl->namespaces, list) {
		timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
		if (timeout <= 0)
			break;
	}
	mutex_unlock(&ctrl->namespaces_mutex);
}
EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);

void nvme_wait_freeze(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

	mutex_lock(&ctrl->namespaces_mutex);
	list_for_each_entry(ns, &ctrl->namespaces, list)
		blk_mq_freeze_queue_wait(ns->queue);
	mutex_unlock(&ctrl->namespaces_mutex);
}
EXPORT_SYMBOL_GPL(nvme_wait_freeze);

void nvme_start_freeze(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

	mutex_lock(&ctrl->namespaces_mutex);
	list_for_each_entry(ns, &ctrl->namespaces, list)
2866
		blk_freeze_queue_start(ns->queue);
K
Keith Busch 已提交
2867 2868 2869 2870
	mutex_unlock(&ctrl->namespaces_mutex);
}
EXPORT_SYMBOL_GPL(nvme_start_freeze);

2871
void nvme_stop_queues(struct nvme_ctrl *ctrl)
2872 2873 2874
{
	struct nvme_ns *ns;

2875
	mutex_lock(&ctrl->namespaces_mutex);
2876
	list_for_each_entry(ns, &ctrl->namespaces, list)
2877
		blk_mq_quiesce_queue(ns->queue);
2878
	mutex_unlock(&ctrl->namespaces_mutex);
2879
}
2880
EXPORT_SYMBOL_GPL(nvme_stop_queues);
2881

2882
void nvme_start_queues(struct nvme_ctrl *ctrl)
2883 2884 2885
{
	struct nvme_ns *ns;

2886
	mutex_lock(&ctrl->namespaces_mutex);
2887
	list_for_each_entry(ns, &ctrl->namespaces, list)
2888
		blk_mq_unquiesce_queue(ns->queue);
2889
	mutex_unlock(&ctrl->namespaces_mutex);
2890
}
2891
EXPORT_SYMBOL_GPL(nvme_start_queues);
2892

S
Sagi Grimberg 已提交
2893 2894 2895 2896 2897 2898 2899 2900 2901 2902
int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set)
{
	if (!ctrl->ops->reinit_request)
		return 0;

	return blk_mq_tagset_iter(set, set->driver_data,
			ctrl->ops->reinit_request);
}
EXPORT_SYMBOL_GPL(nvme_reinit_tagset);

2903 2904 2905 2906
int __init nvme_core_init(void)
{
	int result;

2907 2908 2909 2910 2911
	nvme_wq = alloc_workqueue("nvme-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_wq)
		return -ENOMEM;

2912
	result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
2913
	if (result < 0)
2914
		goto destroy_wq;
2915 2916 2917 2918 2919 2920 2921

	nvme_class = class_create(THIS_MODULE, "nvme");
	if (IS_ERR(nvme_class)) {
		result = PTR_ERR(nvme_class);
		goto unregister_chrdev;
	}

2922
	return 0;
2923

2924
unregister_chrdev:
2925
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
2926 2927
destroy_wq:
	destroy_workqueue(nvme_wq);
2928
	return result;
2929 2930 2931 2932
}

void nvme_core_exit(void)
{
2933
	class_destroy(nvme_class);
2934
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
2935
	destroy_workqueue(nvme_wq);
2936
}
2937 2938 2939 2940 2941

MODULE_LICENSE("GPL");
MODULE_VERSION("1.0");
module_init(nvme_core_init);
module_exit(nvme_core_exit);