core.c 73.5 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 char admin_timeout = 60;
module_param(admin_timeout, byte, 0644);
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 char nvme_io_timeout = 30;
module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
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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 int nvme_char_major;
module_param(nvme_char_major, int, 0);

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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 LIST_HEAD(nvme_ctrl_list);
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static DEFINE_SPINLOCK(dev_list_lock);
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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 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;
	if (jiffies - req->start_time >= req->timeout)
		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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	if (ns->disk) {
		spin_lock(&dev_list_lock);
		ns->disk->private_data = NULL;
		spin_unlock(&dev_list_lock);
	}
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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);
}

static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
{
	struct nvme_ns *ns;

	spin_lock(&dev_list_lock);
	ns = disk->private_data;
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	if (ns) {
		if (!kref_get_unless_zero(&ns->kref))
			goto fail;
		if (!try_module_get(ns->ctrl->ops->module))
			goto fail_put_ns;
	}
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	spin_unlock(&dev_list_lock);

	return ns;
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fail_put_ns:
	kref_put(&ns->kref, nvme_free_ns);
fail:
	spin_unlock(&dev_list_lock);
	return NULL;
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}

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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);
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int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
		void __user *ubuffer, unsigned bufflen,
		void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
		u32 *result, unsigned timeout)
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{
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	bool write = nvme_is_write(cmd);
609 610
	struct nvme_ns *ns = q->queuedata;
	struct gendisk *disk = ns ? ns->disk : NULL;
611
	struct request *req;
612 613
	struct bio *bio = NULL;
	void *meta = NULL;
614 615
	int ret;

616
	req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
617 618 619 620 621 622
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

	if (ubuffer && bufflen) {
623 624 625 626 627 628
		ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
				GFP_KERNEL);
		if (ret)
			goto out;
		bio = req->bio;

629 630
		if (!disk)
			goto submit;
631
		bio->bi_disk = disk;
632

633
		if (meta_buffer && meta_len) {
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
			struct bio_integrity_payload *bip;

			meta = kmalloc(meta_len, GFP_KERNEL);
			if (!meta) {
				ret = -ENOMEM;
				goto out_unmap;
			}

			if (write) {
				if (copy_from_user(meta, meta_buffer,
						meta_len)) {
					ret = -EFAULT;
					goto out_free_meta;
				}
			}

			bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
651 652
			if (IS_ERR(bip)) {
				ret = PTR_ERR(bip);
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
				goto out_free_meta;
			}

			bip->bip_iter.bi_size = meta_len;
			bip->bip_iter.bi_sector = meta_seed;

			ret = bio_integrity_add_page(bio, virt_to_page(meta),
					meta_len, offset_in_page(meta));
			if (ret != meta_len) {
				ret = -ENOMEM;
				goto out_free_meta;
			}
		}
	}
 submit:
	blk_execute_rq(req->q, disk, req, 0);
669 670 671 672
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
673
	if (result)
674
		*result = le32_to_cpu(nvme_req(req)->result.u32);
675 676 677 678 679 680 681
	if (meta && !ret && !write) {
		if (copy_to_user(meta_buffer, meta, meta_len))
			ret = -EFAULT;
	}
 out_free_meta:
	kfree(meta);
 out_unmap:
682
	if (bio)
683
		blk_rq_unmap_user(bio);
684 685 686 687 688
 out:
	blk_mq_free_request(req);
	return ret;
}

689 690 691 692 693 694 695 696
int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
		void __user *ubuffer, unsigned bufflen, u32 *result,
		unsigned timeout)
{
	return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
			result, timeout);
}

697
static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
S
Sagi Grimberg 已提交
698 699 700 701 702
{
	struct nvme_ctrl *ctrl = rq->end_io_data;

	blk_mq_free_request(rq);

703
	if (status) {
S
Sagi Grimberg 已提交
704
		dev_err(ctrl->device,
705 706
			"failed nvme_keep_alive_end_io error=%d\n",
				status);
S
Sagi Grimberg 已提交
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
		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");
742
		nvme_reset_ctrl(ctrl);
S
Sagi Grimberg 已提交
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765
		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
766
static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
767 768 769 770 771 772
{
	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;
773
	c.identify.cns = NVME_ID_CNS_CTRL;
774 775 776 777 778 779 780 781 782 783 784 785

	*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;
}

786 787
static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
		u8 *eui64, u8 *nguid, uuid_t *uuid)
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
{
	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;

803
	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
804 805 806 807 808 809 810 811 812 813 814 815 816
				      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) {
817
				dev_warn(ctrl->device,
818 819 820 821 822
					 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_EUI64_LEN;
823
			memcpy(eui64, data + pos + sizeof(*cur), len);
824 825 826
			break;
		case NVME_NIDT_NGUID:
			if (cur->nidl != NVME_NIDT_NGUID_LEN) {
827
				dev_warn(ctrl->device,
828 829 830 831 832
					 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_NGUID_LEN;
833
			memcpy(nguid, data + pos + sizeof(*cur), len);
834 835 836
			break;
		case NVME_NIDT_UUID:
			if (cur->nidl != NVME_NIDT_UUID_LEN) {
837
				dev_warn(ctrl->device,
838 839 840 841 842
					 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_UUID_LEN;
843
			uuid_copy(uuid, data + pos + sizeof(*cur));
844 845 846 847 848 849 850 851 852 853 854 855 856 857
			break;
		default:
			/* Skip unnkown types */
			len = cur->nidl;
			break;
		}

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

858 859 860 861 862
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;
863
	c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
864 865 866 867
	c.identify.nsid = cpu_to_le32(nsid);
	return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
}

868 869
static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
		unsigned nsid)
870
{
871
	struct nvme_id_ns *id;
872 873 874 875
	struct nvme_command c = { };
	int error;

	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
876 877
	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
878
	c.identify.cns = NVME_ID_CNS_NS;
879

880 881 882
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return NULL;
883

884 885 886 887 888 889 890 891
	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;
892 893
}

K
Keith Busch 已提交
894
static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
895
		      void *buffer, size_t buflen, u32 *result)
896 897
{
	struct nvme_command c;
898
	union nvme_result res;
899
	int ret;
900 901 902 903 904 905

	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);

906
	ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
907
			buffer, buflen, 0, NVME_QID_ANY, 0, 0);
908
	if (ret >= 0 && result)
909
		*result = le32_to_cpu(res.u32);
910
	return ret;
911 912
}

C
Christoph Hellwig 已提交
913 914 915 916 917 918
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;

919
	status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
C
Christoph Hellwig 已提交
920
			&result);
921
	if (status < 0)
C
Christoph Hellwig 已提交
922 923
		return status;

924 925 926 927 928 929
	/*
	 * 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) {
930
		dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
931 932 933 934 935 936
		*count = 0;
	} else {
		nr_io_queues = min(result & 0xffff, result >> 16) + 1;
		*count = min(*count, nr_io_queues);
	}

C
Christoph Hellwig 已提交
937 938
	return 0;
}
939
EXPORT_SYMBOL_GPL(nvme_set_queue_count);
C
Christoph Hellwig 已提交
940

941 942 943 944 945 946 947 948 949
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;
950 951
	if (io.flags)
		return -EINVAL;
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990

	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);

	return __nvme_submit_user_cmd(ns->queue, &c,
			(void __user *)(uintptr_t)io.addr, length,
			metadata, meta_len, io.slba, NULL, 0);
}

991
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
992 993 994 995 996 997 998 999 1000 1001 1002
			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;
1003 1004
	if (cmd.flags)
		return -EINVAL;
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022

	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,
1023
			(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
			&cmd.result, timeout);
	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:
1049 1050 1051 1052
#ifdef CONFIG_NVM
		if (ns->ndev)
			return nvme_nvm_ioctl(ns, cmd, arg);
#endif
1053
		if (is_sed_ioctl(cmd))
1054
			return sed_ioctl(ns->ctrl->opal_dev, cmd,
1055
					 (void __user *) arg);
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
		return -ENOTTY;
	}
}

#ifdef CONFIG_COMPAT
static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
			unsigned int cmd, unsigned long arg)
{
	return nvme_ioctl(bdev, mode, cmd, arg);
}
#else
#define nvme_compat_ioctl	NULL
#endif

static int nvme_open(struct block_device *bdev, fmode_t mode)
{
	return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
}

static void nvme_release(struct gendisk *disk, fmode_t mode)
{
1077 1078 1079 1080
	struct nvme_ns *ns = disk->private_data;

	module_put(ns->ctrl->ops->module);
	nvme_put_ns(ns);
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
}

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
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115
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;
}

1116 1117 1118 1119
static void nvme_init_integrity(struct nvme_ns *ns)
{
	struct blk_integrity integrity;

1120
	memset(&integrity, 0, sizeof(integrity));
1121 1122 1123
	switch (ns->pi_type) {
	case NVME_NS_DPS_PI_TYPE3:
		integrity.profile = &t10_pi_type3_crc;
1124 1125
		integrity.tag_size = sizeof(u16) + sizeof(u32);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1126 1127 1128 1129
		break;
	case NVME_NS_DPS_PI_TYPE1:
	case NVME_NS_DPS_PI_TYPE2:
		integrity.profile = &t10_pi_type1_crc;
1130 1131
		integrity.tag_size = sizeof(u16);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
		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
1142 1143 1144 1145
static void nvme_prep_integrity(struct gendisk *disk, struct nvme_id_ns *id,
		u16 bs)
{
}
1146 1147 1148 1149 1150
static void nvme_init_integrity(struct nvme_ns *ns)
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

1151 1152 1153 1154 1155 1156
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));
}

1157 1158
static void nvme_config_discard(struct nvme_ns *ns)
{
1159
	struct nvme_ctrl *ctrl = ns->ctrl;
1160
	u32 logical_block_size = queue_logical_block_size(ns->queue);
1161

1162 1163 1164
	BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
			NVME_DSM_MAX_RANGES);

1165 1166 1167 1168 1169 1170 1171 1172 1173
	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;
	}
1174
	blk_queue_max_discard_sectors(ns->queue, UINT_MAX);
1175
	blk_queue_max_discard_segments(ns->queue, NVME_DSM_MAX_RANGES);
1176
	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
1177 1178 1179

	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
		blk_queue_max_write_zeroes_sectors(ns->queue, UINT_MAX);
1180 1181
}

1182 1183
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)
1184
{
1185 1186 1187 1188 1189
	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)) {
1190 1191 1192
		 /* Don't treat error as fatal we potentially
		  * already have a NGUID or EUI-64
		  */
1193 1194
		if (nvme_identify_ns_descs(ctrl, nsid, eui64, nguid, uuid))
			dev_warn(ctrl->device,
1195 1196
				 "%s: Identify Descriptors failed\n", __func__);
	}
1197 1198 1199 1200 1201
}

static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
{
	struct nvme_ns *ns = disk->private_data;
1202
	struct nvme_ctrl *ctrl = ns->ctrl;
1203
	u16 bs;
1204 1205 1206 1207 1208

	/*
	 * If identify namespace failed, use default 512 byte block size so
	 * block layer can use before failing read/write for 0 capacity.
	 */
1209
	ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1210 1211 1212
	if (ns->lba_shift == 0)
		ns->lba_shift = 9;
	bs = 1 << ns->lba_shift;
1213
	ns->noiob = le16_to_cpu(id->noiob);
1214 1215 1216

	blk_mq_freeze_queue(disk->queue);

1217
	if (ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)
1218
		nvme_prep_integrity(disk, id, bs);
1219
	blk_queue_logical_block_size(ns->queue, bs);
1220 1221
	if (ns->noiob)
		nvme_set_chunk_size(ns);
K
Keith Busch 已提交
1222
	if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
1223 1224 1225 1226 1227 1228
		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));

1229
	if (ctrl->oncs & NVME_CTRL_ONCS_DSM)
1230 1231
		nvme_config_discard(ns);
	blk_mq_unfreeze_queue(disk->queue);
1232
}
1233

1234 1235 1236
static int nvme_revalidate_disk(struct gendisk *disk)
{
	struct nvme_ns *ns = disk->private_data;
1237 1238 1239
	struct nvme_ctrl *ctrl = ns->ctrl;
	struct nvme_id_ns *id;
	int ret = 0;
1240 1241 1242 1243 1244 1245

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

1246 1247 1248
	id = nvme_identify_ns(ctrl, ns->ns_id);
	if (!id)
		return -ENODEV;
1249

1250 1251 1252 1253
	if (id->ncap == 0) {
		ret = -ENODEV;
		goto out;
	}
1254

1255 1256 1257 1258
	nvme_report_ns_ids(ctrl, ns->ns_id, id, ns->eui, ns->nguid, &ns->uuid);
out:
	kfree(id);
	return ret;
1259 1260 1261 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
}

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)
{
1335
	u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
	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,
};

1353
#ifdef CONFIG_BLK_SED_OPAL
1354 1355
int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
		bool send)
1356
{
1357
	struct nvme_ctrl *ctrl = data;
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
	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 */

1375
static const struct block_device_operations nvme_fops = {
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
	.owner		= THIS_MODULE,
	.ioctl		= nvme_ioctl,
	.compat_ioctl	= nvme_compat_ioctl,
	.open		= nvme_open,
	.release	= nvme_release,
	.getgeo		= nvme_getgeo,
	.revalidate_disk= nvme_revalidate_disk,
	.pr_ops		= &nvme_pr_ops,
};

1386 1387 1388 1389 1390 1391 1392 1393
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
1394 1395
		if (csts == ~0)
			return -ENODEV;
1396 1397 1398 1399 1400 1401 1402
		if ((csts & NVME_CSTS_RDY) == bit)
			break;

		msleep(100);
		if (fatal_signal_pending(current))
			return -EINTR;
		if (time_after(jiffies, timeout)) {
1403
			dev_err(ctrl->device,
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
				"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;
1429

1430
	if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1431 1432
		msleep(NVME_QUIRK_DELAY_AMOUNT);

1433 1434
	return nvme_wait_ready(ctrl, cap, false);
}
1435
EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447

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) {
1448
		dev_err(ctrl->device,
1449 1450 1451 1452 1453 1454 1455 1456 1457
			"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;
1458
	ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1459 1460 1461 1462 1463 1464 1465 1466
	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);
}
1467
EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1468 1469 1470

int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
{
1471
	unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
	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)) {
1490
			dev_err(ctrl->device,
1491 1492 1493 1494 1495 1496 1497
				"Device shutdown incomplete; abort shutdown\n");
			return -ENODEV;
		}
	}

	return ret;
}
1498
EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1499

1500 1501 1502
static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
		struct request_queue *q)
{
1503 1504
	bool vwc = false;

1505
	if (ctrl->max_hw_sectors) {
1506 1507 1508
		u32 max_segments =
			(ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;

1509
		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1510
		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1511
	}
K
Keith Busch 已提交
1512 1513
	if (ctrl->quirks & NVME_QUIRK_STRIPE_SIZE)
		blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
1514
	blk_queue_virt_boundary(q, ctrl->page_size - 1);
1515 1516 1517
	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
		vwc = true;
	blk_queue_write_cache(q, vwc, vwc);
1518 1519
}

1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
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;
}

1537
static int nvme_configure_apst(struct nvme_ctrl *ctrl)
1538 1539 1540 1541 1542 1543 1544 1545
{
	/*
	 * 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
1546
	 * non-operational state after waiting 50 * (enlat + exlat)
1547
	 * microseconds, as long as that state's exit latency is under
1548 1549 1550 1551 1552 1553 1554 1555 1556
	 * 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;
1557 1558
	u64 max_lat_us = 0;
	int max_ps = -1;
1559 1560 1561 1562 1563 1564 1565
	int ret;

	/*
	 * If APST isn't supported or if we haven't been initialized yet,
	 * then don't do anything.
	 */
	if (!ctrl->apsta)
1566
		return 0;
1567 1568 1569

	if (ctrl->npss > 31) {
		dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
1570
		return 0;
1571 1572 1573 1574
	}

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
1575
		return 0;
1576

1577
	if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
1578 1579
		/* Turn off APST. */
		apste = 0;
1580
		dev_dbg(ctrl->device, "APST disabled\n");
1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591
	} 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--) {
1592
			u64 total_latency_us, exit_latency_us, transition_ms;
1593 1594 1595 1596

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

1597 1598 1599 1600 1601 1602 1603 1604
			/*
			 * 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;

1605 1606 1607 1608 1609 1610 1611 1612
			/*
			 * 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;

1613 1614 1615
			exit_latency_us =
				(u64)le32_to_cpu(ctrl->psd[state].exit_lat);
			if (exit_latency_us > ctrl->ps_max_latency_us)
1616 1617
				continue;

1618 1619 1620 1621
			total_latency_us =
				exit_latency_us +
				le32_to_cpu(ctrl->psd[state].entry_lat);

1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
			/*
			 * 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));
1633 1634 1635 1636 1637 1638

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

			if (total_latency_us > max_lat_us)
				max_lat_us = total_latency_us;
1639 1640 1641
		}

		apste = 1;
1642 1643 1644 1645 1646 1647 1648

		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);
		}
1649 1650 1651 1652 1653 1654 1655 1656
	}

	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);
1657
	return ret;
1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
}

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);
	}
}

1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
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[] = {
1694
	{
1695 1696 1697 1698 1699 1700
		/*
		 * 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",
1701
		.quirks = NVME_QUIRK_NO_APST,
1702
	}
1703 1704 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
};

/* 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));
}

1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
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);
}

1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
/*
 * 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;
1769
	u32 max_hw_sectors;
1770
	bool prev_apst_enabled;
1771

1772 1773
	ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
	if (ret) {
1774
		dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
1775 1776 1777
		return ret;
	}

1778 1779
	ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
	if (ret) {
1780
		dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
1781 1782 1783 1784
		return ret;
	}
	page_shift = NVME_CAP_MPSMIN(cap) + 12;

1785
	if (ctrl->vs >= NVME_VS(1, 1, 0))
1786 1787
		ctrl->subsystem = NVME_CAP_NSSRC(cap);

1788 1789
	ret = nvme_identify_ctrl(ctrl, &id);
	if (ret) {
1790
		dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
1791 1792 1793
		return -EIO;
	}

1794 1795
	nvme_init_subnqn(ctrl, id);

1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813
	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;
		}
	}

1814
	if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
1815
		dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
1816 1817 1818
		ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
	}

1819
	ctrl->oacs = le16_to_cpu(id->oacs);
1820
	ctrl->vid = le16_to_cpu(id->vid);
1821
	ctrl->oncs = le16_to_cpup(&id->oncs);
1822
	atomic_set(&ctrl->abort_limit, id->acl + 1);
1823
	ctrl->vwc = id->vwc;
M
Ming Lin 已提交
1824
	ctrl->cntlid = le16_to_cpup(&id->cntlid);
1825 1826 1827 1828
	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)
1829
		max_hw_sectors = 1 << (id->mdts + page_shift - 9);
1830
	else
1831 1832 1833
		max_hw_sectors = UINT_MAX;
	ctrl->max_hw_sectors =
		min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
1834

1835
	nvme_set_queue_limits(ctrl, ctrl->admin_q);
1836
	ctrl->sgls = le32_to_cpu(id->sgls);
S
Sagi Grimberg 已提交
1837
	ctrl->kas = le16_to_cpu(id->kas);
1838

1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852
	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;

1853
	ctrl->npss = id->npss;
1854 1855
	ctrl->apsta = id->apsta;
	prev_apst_enabled = ctrl->apst_enabled;
1856 1857
	if (ctrl->quirks & NVME_QUIRK_NO_APST) {
		if (force_apst && id->apsta) {
1858
			dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
1859
			ctrl->apst_enabled = true;
1860
		} else {
1861
			ctrl->apst_enabled = false;
1862 1863
		}
	} else {
1864
		ctrl->apst_enabled = id->apsta;
1865
	}
1866 1867
	memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));

1868
	if (ctrl->ops->flags & NVME_F_FABRICS) {
1869 1870 1871 1872 1873 1874 1875 1876 1877
		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
		 */
1878
		if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
1879
			ret = -EINVAL;
1880 1881
			goto out_free;
		}
S
Sagi Grimberg 已提交
1882 1883

		if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
1884
			dev_err(ctrl->device,
S
Sagi Grimberg 已提交
1885 1886
				"keep-alive support is mandatory for fabrics\n");
			ret = -EINVAL;
1887
			goto out_free;
S
Sagi Grimberg 已提交
1888
		}
1889 1890
	} else {
		ctrl->cntlid = le16_to_cpu(id->cntlid);
1891 1892
		ctrl->hmpre = le32_to_cpu(id->hmpre);
		ctrl->hmmin = le32_to_cpu(id->hmmin);
1893
	}
1894

1895
	kfree(id);
1896

1897
	if (ctrl->apst_enabled && !prev_apst_enabled)
1898
		dev_pm_qos_expose_latency_tolerance(ctrl->device);
1899
	else if (!ctrl->apst_enabled && prev_apst_enabled)
1900 1901
		dev_pm_qos_hide_latency_tolerance(ctrl->device);

1902 1903 1904
	ret = nvme_configure_apst(ctrl);
	if (ret < 0)
		return ret;
1905 1906 1907 1908
	
	ret = nvme_configure_timestamp(ctrl);
	if (ret < 0)
		return ret;
1909 1910 1911 1912

	ret = nvme_configure_directives(ctrl);
	if (ret < 0)
		return ret;
1913

1914
	ctrl->identified = true;
1915

1916 1917 1918 1919
	return 0;

out_free:
	kfree(id);
1920
	return ret;
1921
}
1922
EXPORT_SYMBOL_GPL(nvme_init_identify);
1923

1924
static int nvme_dev_open(struct inode *inode, struct file *file)
1925
{
1926 1927 1928
	struct nvme_ctrl *ctrl;
	int instance = iminor(inode);
	int ret = -ENODEV;
1929

1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
	spin_lock(&dev_list_lock);
	list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
		if (ctrl->instance != instance)
			continue;

		if (!ctrl->admin_q) {
			ret = -EWOULDBLOCK;
			break;
		}
		if (!kref_get_unless_zero(&ctrl->kref))
			break;
		file->private_data = ctrl;
		ret = 0;
		break;
	}
	spin_unlock(&dev_list_lock);

	return ret;
1948 1949
}

1950
static int nvme_dev_release(struct inode *inode, struct file *file)
1951
{
1952 1953 1954 1955
	nvme_put_ctrl(file->private_data);
	return 0;
}

1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968
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)) {
1969
		dev_warn(ctrl->device,
1970 1971 1972 1973 1974
			"NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
		ret = -EINVAL;
		goto out_unlock;
	}

1975
	dev_warn(ctrl->device,
1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
		"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;
}

1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
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:
1999
		return nvme_dev_user_cmd(ctrl, argp);
2000
	case NVME_IOCTL_RESET:
2001
		dev_warn(ctrl->device, "resetting controller\n");
2002
		return nvme_reset_ctrl_sync(ctrl);
2003 2004
	case NVME_IOCTL_SUBSYS_RESET:
		return nvme_reset_subsystem(ctrl);
K
Keith Busch 已提交
2005 2006 2007
	case NVME_IOCTL_RESCAN:
		nvme_queue_scan(ctrl);
		return 0;
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
	default:
		return -ENOTTY;
	}
}

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

static 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;

2028
	ret = nvme_reset_ctrl_sync(ctrl);
2029 2030 2031
	if (ret < 0)
		return ret;
	return count;
2032
}
2033
static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2034

K
Keith Busch 已提交
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045
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);

2046 2047 2048
static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
								char *buf)
{
2049
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2050 2051 2052 2053
	struct nvme_ctrl *ctrl = ns->ctrl;
	int serial_len = sizeof(ctrl->serial);
	int model_len = sizeof(ctrl->model);

2054 2055 2056
	if (!uuid_is_null(&ns->uuid))
		return sprintf(buf, "uuid.%pU\n", &ns->uuid);

2057 2058
	if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
		return sprintf(buf, "eui.%16phN\n", ns->nguid);
2059 2060 2061 2062

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

2063 2064
	while (serial_len > 0 && (ctrl->serial[serial_len - 1] == ' ' ||
				  ctrl->serial[serial_len - 1] == '\0'))
2065
		serial_len--;
2066 2067
	while (model_len > 0 && (ctrl->model[model_len - 1] == ' ' ||
				 ctrl->model[model_len - 1] == '\0'))
2068 2069 2070 2071 2072 2073 2074
		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);

2075 2076 2077 2078 2079 2080 2081 2082
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);

2083 2084 2085
static ssize_t uuid_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 2094 2095 2096

	/* 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);
2097 2098 2099 2100 2101 2102
}
static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);

static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
								char *buf)
{
2103
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2104 2105 2106 2107 2108 2109 2110
	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)
{
2111
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2112 2113 2114 2115 2116
	return sprintf(buf, "%d\n", ns->ns_id);
}
static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);

static struct attribute *nvme_ns_attrs[] = {
2117
	&dev_attr_wwid.attr,
2118
	&dev_attr_uuid.attr,
2119
	&dev_attr_nguid.attr,
2120 2121 2122 2123 2124
	&dev_attr_eui.attr,
	&dev_attr_nsid.attr,
	NULL,
};

M
Ming Lin 已提交
2125
static umode_t nvme_ns_attrs_are_visible(struct kobject *kobj,
2126 2127 2128
		struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
2129
	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
2130 2131

	if (a == &dev_attr_uuid.attr) {
2132 2133 2134 2135 2136
		if (uuid_is_null(&ns->uuid) ||
		    !memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
			return 0;
	}
	if (a == &dev_attr_nguid.attr) {
2137
		if (!memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148
			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
2149
	.is_visible	= nvme_ns_attrs_are_visible,
2150 2151
};

M
Ming Lin 已提交
2152
#define nvme_show_str_function(field)						\
2153 2154 2155 2156 2157 2158 2159 2160
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
2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
#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);
2174

M
Ming Lin 已提交
2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
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))
		ctrl->ops->delete_ctrl(ctrl);
	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);

2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219
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
2220 2221 2222 2223 2224 2225
static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

2226
	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subnqn);
M
Ming Lin 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239
}
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);

2240 2241
static struct attribute *nvme_dev_attrs[] = {
	&dev_attr_reset_controller.attr,
K
Keith Busch 已提交
2242
	&dev_attr_rescan_controller.attr,
2243 2244 2245
	&dev_attr_model.attr,
	&dev_attr_serial.attr,
	&dev_attr_firmware_rev.attr,
M
Ming Lin 已提交
2246
	&dev_attr_cntlid.attr,
M
Ming Lin 已提交
2247 2248 2249 2250
	&dev_attr_delete_controller.attr,
	&dev_attr_transport.attr,
	&dev_attr_subsysnqn.attr,
	&dev_attr_address.attr,
2251
	&dev_attr_state.attr,
2252 2253 2254
	NULL
};

M
Ming Lin 已提交
2255 2256 2257 2258 2259 2260
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);

2261 2262 2263 2264
	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
2265 2266 2267 2268

	return a->mode;
}

2269
static struct attribute_group nvme_dev_attrs_group = {
M
Ming Lin 已提交
2270 2271
	.attrs		= nvme_dev_attrs,
	.is_visible	= nvme_dev_attrs_are_visible,
2272 2273 2274 2275 2276 2277 2278
};

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

2279 2280 2281 2282 2283 2284 2285 2286
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;
}

2287
static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
2288
{
2289
	struct nvme_ns *ns, *ret = NULL;
2290

2291
	mutex_lock(&ctrl->namespaces_mutex);
2292
	list_for_each_entry(ns, &ctrl->namespaces, list) {
2293 2294 2295 2296 2297
		if (ns->ns_id == nsid) {
			kref_get(&ns->kref);
			ret = ns;
			break;
		}
2298 2299 2300
		if (ns->ns_id > nsid)
			break;
	}
2301 2302
	mutex_unlock(&ctrl->namespaces_mutex);
	return ret;
2303 2304
}

2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330
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;
}

2331 2332 2333 2334
static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;
	struct gendisk *disk;
2335 2336
	struct nvme_id_ns *id;
	char disk_name[DISK_NAME_LEN];
2337 2338 2339 2340 2341 2342
	int node = dev_to_node(ctrl->dev);

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

2343 2344 2345 2346
	ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
	if (ns->instance < 0)
		goto out_free_ns;

2347 2348
	ns->queue = blk_mq_init_queue(ctrl->tagset);
	if (IS_ERR(ns->queue))
2349
		goto out_release_instance;
2350 2351 2352 2353 2354 2355 2356 2357 2358
	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);
2359
	nvme_set_queue_limits(ctrl, ns->queue);
2360
	nvme_setup_streams_ns(ctrl, ns);
2361

2362
	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
2363

2364 2365
	id = nvme_identify_ns(ctrl, nsid);
	if (!id)
2366 2367
		goto out_free_queue;

2368 2369 2370 2371 2372
	if (id->ncap == 0)
		goto out_free_id;

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

2373 2374
	if (nvme_nvm_ns_supported(ns, id) &&
				nvme_nvm_register(ns, disk_name, node)) {
2375
		dev_warn(ctrl->device, "%s: LightNVM init failure\n", __func__);
2376 2377
		goto out_free_id;
	}
2378

2379 2380 2381
	disk = alloc_disk_node(0, node);
	if (!disk)
		goto out_free_id;
2382

2383 2384 2385 2386 2387 2388 2389 2390
	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);
2391

2392 2393 2394 2395
	mutex_lock(&ctrl->namespaces_mutex);
	list_add_tail(&ns->list, &ctrl->namespaces);
	mutex_unlock(&ctrl->namespaces_mutex);

2396
	kref_get(&ctrl->kref);
2397 2398 2399

	kfree(id);

2400
	device_add_disk(ctrl->device, ns->disk);
2401 2402 2403 2404
	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);
2405 2406 2407
	if (ns->ndev && nvme_nvm_register_sysfs(ns))
		pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
			ns->disk->disk_name);
2408
	return;
2409 2410
 out_free_id:
	kfree(id);
2411 2412
 out_free_queue:
	blk_cleanup_queue(ns->queue);
2413 2414
 out_release_instance:
	ida_simple_remove(&ctrl->ns_ida, ns->instance);
2415 2416 2417 2418 2419 2420
 out_free_ns:
	kfree(ns);
}

static void nvme_ns_remove(struct nvme_ns *ns)
{
2421 2422
	if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
		return;
2423

2424
	if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
2425 2426
		if (blk_get_integrity(ns->disk))
			blk_integrity_unregister(ns->disk);
2427 2428
		sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
					&nvme_ns_attr_group);
2429 2430
		if (ns->ndev)
			nvme_nvm_unregister_sysfs(ns);
2431 2432 2433
		del_gendisk(ns->disk);
		blk_cleanup_queue(ns->queue);
	}
2434 2435

	mutex_lock(&ns->ctrl->namespaces_mutex);
2436
	list_del_init(&ns->list);
2437 2438
	mutex_unlock(&ns->ctrl->namespaces_mutex);

2439 2440 2441
	nvme_put_ns(ns);
}

2442 2443 2444 2445
static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;

2446
	ns = nvme_find_get_ns(ctrl, nsid);
2447
	if (ns) {
2448
		if (ns->disk && revalidate_disk(ns->disk))
2449
			nvme_ns_remove(ns);
2450
		nvme_put_ns(ns);
2451 2452 2453 2454
	} else
		nvme_alloc_ns(ctrl, nsid);
}

2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
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);
	}
}

2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479
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)
2480
			goto free;
2481 2482 2483 2484 2485 2486 2487 2488 2489

		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) {
2490 2491
				ns = nvme_find_get_ns(ctrl, prev);
				if (ns) {
2492
					nvme_ns_remove(ns);
2493 2494
					nvme_put_ns(ns);
				}
2495 2496 2497 2498 2499
			}
		}
		nn -= j;
	}
 out:
2500 2501
	nvme_remove_invalid_namespaces(ctrl, prev);
 free:
2502 2503 2504 2505
	kfree(ns_list);
	return ret;
}

2506
static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
2507 2508 2509
{
	unsigned i;

2510 2511 2512
	for (i = 1; i <= nn; i++)
		nvme_validate_ns(ctrl, i);

2513
	nvme_remove_invalid_namespaces(ctrl, nn);
2514 2515
}

2516
static void nvme_scan_work(struct work_struct *work)
2517
{
2518 2519
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, scan_work);
2520
	struct nvme_id_ctrl *id;
2521
	unsigned nn;
2522

2523 2524 2525
	if (ctrl->state != NVME_CTRL_LIVE)
		return;

2526 2527
	if (nvme_identify_ctrl(ctrl, &id))
		return;
2528 2529

	nn = le32_to_cpu(id->nn);
2530
	if (ctrl->vs >= NVME_VS(1, 1, 0) &&
2531 2532 2533 2534
	    !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
		if (!nvme_scan_ns_list(ctrl, nn))
			goto done;
	}
2535
	nvme_scan_ns_sequential(ctrl, nn);
2536
 done:
2537
	mutex_lock(&ctrl->namespaces_mutex);
2538
	list_sort(NULL, &ctrl->namespaces, ns_cmp);
2539
	mutex_unlock(&ctrl->namespaces_mutex);
2540 2541
	kfree(id);
}
2542 2543 2544 2545 2546 2547 2548 2549

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)
2550
		queue_work(nvme_wq, &ctrl->scan_work);
2551 2552
}
EXPORT_SYMBOL_GPL(nvme_queue_scan);
2553

2554 2555 2556 2557 2558
/*
 * 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.
 */
2559 2560 2561 2562
void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns, *next;

2563 2564 2565 2566 2567 2568 2569 2570 2571
	/*
	 * 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);

2572 2573 2574
	list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
		nvme_ns_remove(ns);
}
2575
EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
2576

2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592
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);
	while (ctrl->event_limit > 0) {
		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);
}

2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
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
2617
	c.common.nsid = cpu_to_le32(NVME_NSID_ALL);
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 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657
	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);
}

2658 2659
void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
		union nvme_result *res)
2660
{
2661 2662
	u32 result = le32_to_cpu(res->u32);
	bool done = true;
2663

2664 2665 2666 2667 2668
	switch (le16_to_cpu(status) >> 1) {
	case NVME_SC_SUCCESS:
		done = false;
		/*FALLTHRU*/
	case NVME_SC_ABORT_REQ:
2669
		++ctrl->event_limit;
2670
		queue_work(nvme_wq, &ctrl->async_event_work);
2671 2672 2673
		break;
	default:
		break;
2674 2675
	}

2676
	if (done)
2677 2678 2679 2680 2681 2682 2683
		return;

	switch (result & 0xff07) {
	case NVME_AER_NOTICE_NS_CHANGED:
		dev_info(ctrl->device, "rescanning\n");
		nvme_queue_scan(ctrl);
		break;
2684 2685 2686
	case NVME_AER_NOTICE_FW_ACT_STARTING:
		schedule_work(&ctrl->fw_act_work);
		break;
2687 2688 2689 2690 2691 2692 2693 2694 2695
	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;
2696
	queue_work(nvme_wq, &ctrl->async_event_work);
2697 2698 2699
}
EXPORT_SYMBOL_GPL(nvme_queue_async_events);

2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728
static DEFINE_IDA(nvme_instance_ida);

static int nvme_set_instance(struct nvme_ctrl *ctrl)
{
	int instance, error;

	do {
		if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
			return -ENODEV;

		spin_lock(&dev_list_lock);
		error = ida_get_new(&nvme_instance_ida, &instance);
		spin_unlock(&dev_list_lock);
	} while (error == -EAGAIN);

	if (error)
		return -ENODEV;

	ctrl->instance = instance;
	return 0;
}

static void nvme_release_instance(struct nvme_ctrl *ctrl)
{
	spin_lock(&dev_list_lock);
	ida_remove(&nvme_instance_ida, ctrl->instance);
	spin_unlock(&dev_list_lock);
}

2729
void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
2730
{
2731
	nvme_stop_keep_alive(ctrl);
2732
	flush_work(&ctrl->async_event_work);
2733
	flush_work(&ctrl->scan_work);
2734
	cancel_work_sync(&ctrl->fw_act_work);
2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749
}
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);
2750

2751 2752
void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
{
2753
	device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
2754 2755 2756 2757

	spin_lock(&dev_list_lock);
	list_del(&ctrl->node);
	spin_unlock(&dev_list_lock);
2758
}
2759
EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
2760 2761 2762 2763

static void nvme_free_ctrl(struct kref *kref)
{
	struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
2764 2765 2766

	put_device(ctrl->device);
	nvme_release_instance(ctrl);
2767
	ida_destroy(&ctrl->ns_ida);
2768 2769 2770 2771 2772 2773 2774 2775

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

void nvme_put_ctrl(struct nvme_ctrl *ctrl)
{
	kref_put(&ctrl->kref, nvme_free_ctrl);
}
2776
EXPORT_SYMBOL_GPL(nvme_put_ctrl);
2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787

/*
 * 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;

2788 2789
	ctrl->state = NVME_CTRL_NEW;
	spin_lock_init(&ctrl->lock);
2790
	INIT_LIST_HEAD(&ctrl->namespaces);
2791
	mutex_init(&ctrl->namespaces_mutex);
2792 2793 2794 2795
	kref_init(&ctrl->kref);
	ctrl->dev = dev;
	ctrl->ops = ops;
	ctrl->quirks = quirks;
2796
	INIT_WORK(&ctrl->scan_work, nvme_scan_work);
2797
	INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
2798
	INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
2799 2800 2801 2802 2803

	ret = nvme_set_instance(ctrl);
	if (ret)
		goto out;

2804
	ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
2805
				MKDEV(nvme_char_major, ctrl->instance),
2806
				ctrl, nvme_dev_attr_groups,
2807
				"nvme%d", ctrl->instance);
2808 2809 2810 2811 2812
	if (IS_ERR(ctrl->device)) {
		ret = PTR_ERR(ctrl->device);
		goto out_release_instance;
	}
	get_device(ctrl->device);
2813
	ida_init(&ctrl->ns_ida);
2814 2815 2816 2817 2818

	spin_lock(&dev_list_lock);
	list_add_tail(&ctrl->node, &nvme_ctrl_list);
	spin_unlock(&dev_list_lock);

2819 2820 2821 2822 2823 2824 2825 2826
	/*
	 * 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));

2827 2828 2829 2830 2831 2832
	return 0;
out_release_instance:
	nvme_release_instance(ctrl);
out:
	return ret;
}
2833
EXPORT_SYMBOL_GPL(nvme_init_ctrl);
2834

2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845
/**
 * 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;

2846
	mutex_lock(&ctrl->namespaces_mutex);
M
Ming Lei 已提交
2847

2848
	/* Forcibly unquiesce queues to avoid blocking dispatch */
2849 2850
	if (ctrl->admin_q)
		blk_mq_unquiesce_queue(ctrl->admin_q);
2851

2852
	list_for_each_entry(ns, &ctrl->namespaces, list) {
2853 2854 2855 2856
		/*
		 * Revalidating a dead namespace sets capacity to 0. This will
		 * end buffered writers dirtying pages that can't be synced.
		 */
2857 2858 2859
		if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
			continue;
		revalidate_disk(ns->disk);
2860
		blk_set_queue_dying(ns->queue);
2861

2862 2863
		/* Forcibly unquiesce queues to avoid blocking dispatch */
		blk_mq_unquiesce_queue(ns->queue);
2864
	}
2865
	mutex_unlock(&ctrl->namespaces_mutex);
2866
}
2867
EXPORT_SYMBOL_GPL(nvme_kill_queues);
2868

K
Keith Busch 已提交
2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
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)
2911
		blk_freeze_queue_start(ns->queue);
K
Keith Busch 已提交
2912 2913 2914 2915
	mutex_unlock(&ctrl->namespaces_mutex);
}
EXPORT_SYMBOL_GPL(nvme_start_freeze);

2916
void nvme_stop_queues(struct nvme_ctrl *ctrl)
2917 2918 2919
{
	struct nvme_ns *ns;

2920
	mutex_lock(&ctrl->namespaces_mutex);
2921
	list_for_each_entry(ns, &ctrl->namespaces, list)
2922
		blk_mq_quiesce_queue(ns->queue);
2923
	mutex_unlock(&ctrl->namespaces_mutex);
2924
}
2925
EXPORT_SYMBOL_GPL(nvme_stop_queues);
2926

2927
void nvme_start_queues(struct nvme_ctrl *ctrl)
2928 2929 2930
{
	struct nvme_ns *ns;

2931
	mutex_lock(&ctrl->namespaces_mutex);
2932
	list_for_each_entry(ns, &ctrl->namespaces, list)
2933
		blk_mq_unquiesce_queue(ns->queue);
2934
	mutex_unlock(&ctrl->namespaces_mutex);
2935
}
2936
EXPORT_SYMBOL_GPL(nvme_start_queues);
2937

2938 2939 2940 2941
int __init nvme_core_init(void)
{
	int result;

2942 2943 2944 2945 2946
	nvme_wq = alloc_workqueue("nvme-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_wq)
		return -ENOMEM;

2947 2948 2949
	result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
							&nvme_dev_fops);
	if (result < 0)
2950
		goto destroy_wq;
2951 2952 2953 2954 2955 2956 2957 2958 2959
	else if (result > 0)
		nvme_char_major = result;

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

2960
	return 0;
2961

2962
unregister_chrdev:
2963
	__unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
2964 2965
destroy_wq:
	destroy_workqueue(nvme_wq);
2966
	return result;
2967 2968 2969 2970
}

void nvme_core_exit(void)
{
2971 2972
	class_destroy(nvme_class);
	__unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
2973
	destroy_workqueue(nvme_wq);
2974
}
2975 2976 2977 2978 2979

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