core.c 87.9 KB
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/*
 * NVM Express device driver
 * Copyright (c) 2011-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

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

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

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

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

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

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struct workqueue_struct *nvme_wq;
EXPORT_SYMBOL_GPL(nvme_wq);

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static DEFINE_IDA(nvme_subsystems_ida);
static LIST_HEAD(nvme_subsystems);
static DEFINE_MUTEX(nvme_subsystems_lock);
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static DEFINE_IDA(nvme_instance_ida);
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static dev_t nvme_chr_devt;
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static struct class *nvme_class;
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static struct class *nvme_subsys_class;
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static void nvme_ns_remove(struct nvme_ns *ns);
static int nvme_revalidate_disk(struct gendisk *disk);
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static __le32 nvme_get_log_dw10(u8 lid, size_t size)
{
	return cpu_to_le32((((size / 4) - 1) << 16) | lid);
}

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

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

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

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

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

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

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

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

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static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
{
	return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
}

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

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

void nvme_complete_rq(struct request *req)
{
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	if (unlikely(nvme_req(req)->status && nvme_req_needs_retry(req))) {
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		if (nvme_req_needs_failover(req)) {
			nvme_failover_req(req);
			return;
		}

		if (!blk_queue_dying(req->q)) {
			nvme_req(req)->retries++;
			blk_mq_requeue_request(req, true);
			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)
{
	if (!blk_mq_request_started(req))
		return;

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

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	nvme_req(req)->status = NVME_SC_ABORT_REQ;
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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) {
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	case NVME_CTRL_ADMIN_ONLY:
		switch (old_state) {
		case NVME_CTRL_RESETTING:
			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
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	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:
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		case NVME_CTRL_ADMIN_ONLY:
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			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
	case NVME_CTRL_RECONNECTING:
		switch (old_state) {
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		case NVME_CTRL_LIVE:
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		case NVME_CTRL_RESETTING:
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			changed = true;
			/* FALLTHRU */
		default:
			break;
		}
		break;
	case NVME_CTRL_DELETING:
		switch (old_state) {
		case NVME_CTRL_LIVE:
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		case NVME_CTRL_ADMIN_ONLY:
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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;
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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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	if (changed && ctrl->state == NVME_CTRL_LIVE)
		nvme_kick_requeue_lists(ctrl);
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	return changed;
}
EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);

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static void nvme_free_ns_head(struct kref *ref)
{
	struct nvme_ns_head *head =
		container_of(ref, struct nvme_ns_head, ref);

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	nvme_mpath_remove_disk(head);
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	ida_simple_remove(&head->subsys->ns_ida, head->instance);
	list_del_init(&head->entry);
	cleanup_srcu_struct(&head->srcu);
	kfree(head);
}

static void nvme_put_ns_head(struct nvme_ns_head *head)
{
	kref_put(&head->ref, nvme_free_ns_head);
}

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

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	if (ns->ndev)
		nvme_nvm_unregister(ns);
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	put_disk(ns->disk);
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	nvme_put_ns_head(ns->head);
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	nvme_put_ctrl(ns->ctrl);
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	kfree(ns);
}

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

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struct request *nvme_alloc_request(struct request_queue *q,
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		struct nvme_command *cmd, blk_mq_req_flags_t 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;
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	cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
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}

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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;
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	cmnd->dsm.nsid = cpu_to_le32(ns->head->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;

	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);
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	cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
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	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) {
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		/*
		 * If formated with metadata, the block layer always provides a
		 * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled.  Else
		 * we enable the PRACT bit for protection information or set the
		 * namespace capacity to zero to prevent any I/O.
		 */
		if (!blk_integrity_rq(req)) {
			if (WARN_ON_ONCE(!nvme_ns_has_pi(ns)))
				return BLK_STS_NOTSUPP;
			control |= NVME_RW_PRINFO_PRACT;
		}

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		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;
		}
	}

	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);
601
		return BLK_STS_IOERR;
602
	}
M
Ming Lin 已提交
603

604
	cmd->common.command_id = req->tag;
M
Ming Lin 已提交
605 606 607 608
	return ret;
}
EXPORT_SYMBOL_GPL(nvme_setup_cmd);

609 610 611 612 613
/*
 * 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,
614
		union nvme_result *result, void *buffer, unsigned bufflen,
615 616
		unsigned timeout, int qid, int at_head,
		blk_mq_req_flags_t flags)
617 618 619 620
{
	struct request *req;
	int ret;

621
	req = nvme_alloc_request(q, cmd, flags, qid);
622 623 624 625 626
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

627 628 629 630
	if (buffer && bufflen) {
		ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
		if (ret)
			goto out;
631 632
	}

633
	blk_execute_rq(req->q, NULL, req, at_head);
634 635
	if (result)
		*result = nvme_req(req)->result;
636 637 638 639
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
640 641 642 643
 out:
	blk_mq_free_request(req);
	return ret;
}
644
EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
645 646 647 648

int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
		void *buffer, unsigned bufflen)
{
649 650
	return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
			NVME_QID_ANY, 0, 0);
651
}
652
EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
653

654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
		unsigned len, u32 seed, bool write)
{
	struct bio_integrity_payload *bip;
	int ret = -ENOMEM;
	void *buf;

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

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

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

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

688
static int nvme_submit_user_cmd(struct request_queue *q,
689 690 691
		struct nvme_command *cmd, void __user *ubuffer,
		unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
		u32 meta_seed, u32 *result, unsigned timeout)
692
{
693
	bool write = nvme_is_write(cmd);
694 695
	struct nvme_ns *ns = q->queuedata;
	struct gendisk *disk = ns ? ns->disk : NULL;
696
	struct request *req;
697 698
	struct bio *bio = NULL;
	void *meta = NULL;
699 700
	int ret;

701
	req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
702 703 704 705 706 707
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

	if (ubuffer && bufflen) {
708 709 710 711 712
		ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
				GFP_KERNEL);
		if (ret)
			goto out;
		bio = req->bio;
713
		bio->bi_disk = disk;
714 715 716 717 718
		if (disk && meta_buffer && meta_len) {
			meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
					meta_seed, write);
			if (IS_ERR(meta)) {
				ret = PTR_ERR(meta);
719 720 721 722
				goto out_unmap;
			}
		}
	}
723

724
	blk_execute_rq(req->q, disk, req, 0);
725 726 727 728
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
729
	if (result)
730
		*result = le32_to_cpu(nvme_req(req)->result.u32);
731 732 733 734 735 736
	if (meta && !ret && !write) {
		if (copy_to_user(meta_buffer, meta, meta_len))
			ret = -EFAULT;
	}
	kfree(meta);
 out_unmap:
737
	if (bio)
738
		blk_rq_unmap_user(bio);
739 740 741 742 743
 out:
	blk_mq_free_request(req);
	return ret;
}

744
static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
S
Sagi Grimberg 已提交
745 746 747 748 749
{
	struct nvme_ctrl *ctrl = rq->end_io_data;

	blk_mq_free_request(rq);

750
	if (status) {
S
Sagi Grimberg 已提交
751
		dev_err(ctrl->device,
752 753
			"failed nvme_keep_alive_end_io error=%d\n",
				status);
S
Sagi Grimberg 已提交
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
		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");
789
		nvme_reset_ctrl(ctrl);
S
Sagi Grimberg 已提交
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
		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
813
static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
814 815 816 817 818 819
{
	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;
820
	c.identify.cns = NVME_ID_CNS_CTRL;
821 822 823 824 825 826 827 828 829 830 831 832

	*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;
}

833
static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
834
		struct nvme_ns_ids *ids)
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849
{
	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;

850
	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
851 852 853 854 855 856 857 858 859 860 861 862 863
				      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) {
864
				dev_warn(ctrl->device,
865 866 867 868 869
					 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_EUI64_LEN;
870
			memcpy(ids->eui64, data + pos + sizeof(*cur), len);
871 872 873
			break;
		case NVME_NIDT_NGUID:
			if (cur->nidl != NVME_NIDT_NGUID_LEN) {
874
				dev_warn(ctrl->device,
875 876 877 878 879
					 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_NGUID_LEN;
880
			memcpy(ids->nguid, data + pos + sizeof(*cur), len);
881 882 883
			break;
		case NVME_NIDT_UUID:
			if (cur->nidl != NVME_NIDT_UUID_LEN) {
884
				dev_warn(ctrl->device,
885 886 887 888 889
					 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_UUID_LEN;
890
			uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
891 892 893 894 895 896 897 898 899 900 901 902 903 904
			break;
		default:
			/* Skip unnkown types */
			len = cur->nidl;
			break;
		}

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

905 906 907 908 909
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;
910
	c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
911 912 913 914
	c.identify.nsid = cpu_to_le32(nsid);
	return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
}

915 916
static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
		unsigned nsid)
917
{
918
	struct nvme_id_ns *id;
919 920 921 922
	struct nvme_command c = { };
	int error;

	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
923 924
	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
925
	c.identify.cns = NVME_ID_CNS_NS;
926

927 928 929
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return NULL;
930

931 932 933 934 935 936 937 938
	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;
939 940
}

K
Keith Busch 已提交
941
static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
942
		      void *buffer, size_t buflen, u32 *result)
943 944
{
	struct nvme_command c;
945
	union nvme_result res;
946
	int ret;
947 948 949 950 951 952

	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);

953
	ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
954
			buffer, buflen, 0, NVME_QID_ANY, 0, 0);
955
	if (ret >= 0 && result)
956
		*result = le32_to_cpu(res.u32);
957
	return ret;
958 959
}

C
Christoph Hellwig 已提交
960 961 962 963 964 965
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;

966
	status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
C
Christoph Hellwig 已提交
967
			&result);
968
	if (status < 0)
C
Christoph Hellwig 已提交
969 970
		return status;

971 972 973 974 975 976
	/*
	 * 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) {
977
		dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
978 979 980 981 982 983
		*count = 0;
	} else {
		nr_io_queues = min(result & 0xffff, result >> 16) + 1;
		*count = min(*count, nr_io_queues);
	}

C
Christoph Hellwig 已提交
984 985
	return 0;
}
986
EXPORT_SYMBOL_GPL(nvme_set_queue_count);
C
Christoph Hellwig 已提交
987

988 989 990 991 992 993 994 995 996
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;
997 998
	if (io.flags)
		return -EINVAL;
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023

	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
Christoph Hellwig 已提交
1024
	c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1025 1026 1027 1028 1029 1030 1031 1032
	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);

1033
	return nvme_submit_user_cmd(ns->queue, &c,
1034 1035 1036 1037
			(void __user *)(uintptr_t)io.addr, length,
			metadata, meta_len, io.slba, NULL, 0);
}

1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
static u32 nvme_known_admin_effects(u8 opcode)
{
	switch (opcode) {
	case nvme_admin_format_nvm:
		return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC |
					NVME_CMD_EFFECTS_CSE_MASK;
	case nvme_admin_sanitize_nvm:
		return NVME_CMD_EFFECTS_CSE_MASK;
	default:
		break;
	}
	return 0;
}

static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
								u8 opcode)
{
	u32 effects = 0;

	if (ns) {
		if (ctrl->effects)
			effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
		if (effects & ~NVME_CMD_EFFECTS_CSUPP)
			dev_warn(ctrl->device,
				 "IO command:%02x has unhandled effects:%08x\n",
				 opcode, effects);
		return 0;
	}

	if (ctrl->effects)
		effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
	else
		effects = nvme_known_admin_effects(opcode);

	/*
	 * For simplicity, IO to all namespaces is quiesced even if the command
	 * effects say only one namespace is affected.
	 */
	if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) {
		nvme_start_freeze(ctrl);
		nvme_wait_freeze(ctrl);
	}
	return effects;
}

static void nvme_update_formats(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns;

	mutex_lock(&ctrl->namespaces_mutex);
	list_for_each_entry(ns, &ctrl->namespaces, list) {
		if (ns->disk && nvme_revalidate_disk(ns->disk))
			nvme_ns_remove(ns);
	}
	mutex_unlock(&ctrl->namespaces_mutex);
}

static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
{
	/*
	 * Revalidate LBA changes prior to unfreezing. This is necessary to
	 * prevent memory corruption if a logical block size was changed by
	 * this command.
	 */
	if (effects & NVME_CMD_EFFECTS_LBCC)
		nvme_update_formats(ctrl);
	if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK))
		nvme_unfreeze(ctrl);
	if (effects & NVME_CMD_EFFECTS_CCC)
		nvme_init_identify(ctrl);
	if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
		nvme_queue_scan(ctrl);
}

1112
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1113 1114 1115 1116 1117
			struct nvme_passthru_cmd __user *ucmd)
{
	struct nvme_passthru_cmd cmd;
	struct nvme_command c;
	unsigned timeout = 0;
1118
	u32 effects;
1119 1120 1121 1122 1123 1124
	int status;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
		return -EFAULT;
1125 1126
	if (cmd.flags)
		return -EINVAL;
1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143

	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);

1144
	effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1145
	status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1146
			(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1147 1148
			(void __user *)(uintptr_t)cmd.metadata, cmd.metadata,
			0, &cmd.result, timeout);
1149 1150
	nvme_passthru_end(ctrl, effects);

1151 1152 1153 1154 1155 1156 1157 1158
	if (status >= 0) {
		if (put_user(cmd.result, &ucmd->result))
			return -EFAULT;
	}

	return status;
}

1159 1160 1161 1162 1163 1164
/*
 * Issue ioctl requests on the first available path.  Note that unlike normal
 * block layer requests we will not retry failed request on another controller.
 */
static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk,
		struct nvme_ns_head **head, int *srcu_idx)
1165
{
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
#ifdef CONFIG_NVME_MULTIPATH
	if (disk->fops == &nvme_ns_head_ops) {
		*head = disk->private_data;
		*srcu_idx = srcu_read_lock(&(*head)->srcu);
		return nvme_find_path(*head);
	}
#endif
	*head = NULL;
	*srcu_idx = -1;
	return disk->private_data;
}
1177

1178 1179 1180 1181 1182
static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
{
	if (head)
		srcu_read_unlock(&head->srcu, idx);
}
1183

1184 1185
static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned cmd, unsigned long arg)
{
1186 1187 1188
	switch (cmd) {
	case NVME_IOCTL_ID:
		force_successful_syscall_return();
C
Christoph Hellwig 已提交
1189
		return ns->head->ns_id;
1190 1191 1192 1193 1194 1195 1196
	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:
1197 1198 1199 1200
#ifdef CONFIG_NVM
		if (ns->ndev)
			return nvme_nvm_ioctl(ns, cmd, arg);
#endif
1201
		if (is_sed_ioctl(cmd))
1202
			return sed_ioctl(ns->ctrl->opal_dev, cmd,
1203
					 (void __user *) arg);
1204 1205 1206 1207
		return -ENOTTY;
	}
}

1208 1209
static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
1210
{
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221
	struct nvme_ns_head *head = NULL;
	struct nvme_ns *ns;
	int srcu_idx, ret;

	ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
	if (unlikely(!ns))
		ret = -EWOULDBLOCK;
	else
		ret = nvme_ns_ioctl(ns, cmd, arg);
	nvme_put_ns_from_disk(head, srcu_idx);
	return ret;
1222 1223 1224 1225
}

static int nvme_open(struct block_device *bdev, fmode_t mode)
{
C
Christoph Hellwig 已提交
1226 1227
	struct nvme_ns *ns = bdev->bd_disk->private_data;

1228 1229 1230
#ifdef CONFIG_NVME_MULTIPATH
	/* should never be called due to GENHD_FL_HIDDEN */
	if (WARN_ON_ONCE(ns->head->disk))
1231
		goto fail;
1232
#endif
C
Christoph Hellwig 已提交
1233
	if (!kref_get_unless_zero(&ns->kref))
1234 1235 1236 1237
		goto fail;
	if (!try_module_get(ns->ctrl->ops->module))
		goto fail_put_ns;

C
Christoph Hellwig 已提交
1238
	return 0;
1239 1240 1241 1242 1243

fail_put_ns:
	nvme_put_ns(ns);
fail:
	return -ENXIO;
1244 1245 1246 1247
}

static void nvme_release(struct gendisk *disk, fmode_t mode)
{
1248 1249 1250 1251
	struct nvme_ns *ns = disk->private_data;

	module_put(ns->ctrl->ops->module);
	nvme_put_ns(ns);
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
}

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
1264
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1265 1266 1267
{
	struct blk_integrity integrity;

1268
	memset(&integrity, 0, sizeof(integrity));
1269
	switch (pi_type) {
1270 1271
	case NVME_NS_DPS_PI_TYPE3:
		integrity.profile = &t10_pi_type3_crc;
1272 1273
		integrity.tag_size = sizeof(u16) + sizeof(u32);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1274 1275 1276 1277
		break;
	case NVME_NS_DPS_PI_TYPE1:
	case NVME_NS_DPS_PI_TYPE2:
		integrity.profile = &t10_pi_type1_crc;
1278 1279
		integrity.tag_size = sizeof(u16);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1280 1281 1282 1283 1284
		break;
	default:
		integrity.profile = NULL;
		break;
	}
1285 1286 1287
	integrity.tuple_size = ms;
	blk_integrity_register(disk, &integrity);
	blk_queue_max_integrity_segments(disk->queue, 1);
1288 1289
}
#else
1290
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1291 1292 1293 1294
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

1295 1296 1297 1298 1299 1300
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));
}

1301 1302
static void nvme_config_discard(struct nvme_ctrl *ctrl,
		unsigned stream_alignment, struct request_queue *queue)
1303
{
1304 1305 1306 1307
	u32 size = queue_logical_block_size(queue);

	if (stream_alignment)
		size *= stream_alignment;
1308

1309 1310 1311
	BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
			NVME_DSM_MAX_RANGES);

1312 1313
	queue->limits.discard_alignment = size;
	queue->limits.discard_granularity = size;
1314

1315 1316 1317
	blk_queue_max_discard_sectors(queue, UINT_MAX);
	blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, queue);
1318 1319

	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1320
		blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1321 1322
}

1323
static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1324
		struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1325
{
1326 1327
	memset(ids, 0, sizeof(*ids));

1328
	if (ctrl->vs >= NVME_VS(1, 1, 0))
1329
		memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1330
	if (ctrl->vs >= NVME_VS(1, 2, 0))
1331
		memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1332
	if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1333 1334 1335
		 /* Don't treat error as fatal we potentially
		  * already have a NGUID or EUI-64
		  */
1336
		if (nvme_identify_ns_descs(ctrl, nsid, ids))
1337
			dev_warn(ctrl->device,
1338 1339
				 "%s: Identify Descriptors failed\n", __func__);
	}
1340 1341
}

C
Christoph Hellwig 已提交
1342 1343 1344 1345 1346 1347 1348
static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
{
	return !uuid_is_null(&ids->uuid) ||
		memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) ||
		memchr_inv(ids->eui64, 0, sizeof(ids->eui64));
}

1349 1350 1351 1352 1353 1354 1355
static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b)
{
	return uuid_equal(&a->uuid, &b->uuid) &&
		memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 &&
		memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0;
}

1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
static void nvme_update_disk_info(struct gendisk *disk,
		struct nvme_ns *ns, struct nvme_id_ns *id)
{
	sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9);
	unsigned stream_alignment = 0;

	if (ns->ctrl->nr_streams && ns->sws && ns->sgs)
		stream_alignment = ns->sws * ns->sgs;

	blk_mq_freeze_queue(disk->queue);
	blk_integrity_unregister(disk);

	blk_queue_logical_block_size(disk->queue, 1 << ns->lba_shift);
	if (ns->ms && !ns->ext &&
	    (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
		nvme_init_integrity(disk, ns->ms, ns->pi_type);
1372
	if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk))
1373 1374 1375 1376 1377 1378 1379 1380
		capacity = 0;
	set_capacity(disk, capacity);

	if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
		nvme_config_discard(ns->ctrl, stream_alignment, disk->queue);
	blk_mq_unfreeze_queue(disk->queue);
}

1381 1382 1383
static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
{
	struct nvme_ns *ns = disk->private_data;
1384 1385 1386 1387 1388

	/*
	 * If identify namespace failed, use default 512 byte block size so
	 * block layer can use before failing read/write for 0 capacity.
	 */
1389
	ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1390 1391
	if (ns->lba_shift == 0)
		ns->lba_shift = 9;
1392
	ns->noiob = le16_to_cpu(id->noiob);
1393 1394 1395 1396 1397 1398 1399
	ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
	ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
	/* the PI implementation requires metadata equal t10 pi tuple size */
	if (ns->ms == sizeof(struct t10_pi_tuple))
		ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK;
	else
		ns->pi_type = 0;
1400

1401 1402
	if (ns->noiob)
		nvme_set_chunk_size(ns);
1403
	nvme_update_disk_info(disk, ns, id);
1404 1405 1406 1407
#ifdef CONFIG_NVME_MULTIPATH
	if (ns->head->disk)
		nvme_update_disk_info(ns->head->disk, ns, id);
#endif
1408
}
1409

1410 1411 1412
static int nvme_revalidate_disk(struct gendisk *disk)
{
	struct nvme_ns *ns = disk->private_data;
1413 1414
	struct nvme_ctrl *ctrl = ns->ctrl;
	struct nvme_id_ns *id;
1415
	struct nvme_ns_ids ids;
1416
	int ret = 0;
1417 1418 1419 1420 1421 1422

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

C
Christoph Hellwig 已提交
1423
	id = nvme_identify_ns(ctrl, ns->head->ns_id);
1424 1425
	if (!id)
		return -ENODEV;
1426

1427 1428 1429 1430
	if (id->ncap == 0) {
		ret = -ENODEV;
		goto out;
	}
1431

1432
	__nvme_revalidate_disk(disk, id);
C
Christoph Hellwig 已提交
1433 1434
	nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
	if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1435
		dev_err(ctrl->device,
C
Christoph Hellwig 已提交
1436
			"identifiers changed for nsid %d\n", ns->head->ns_id);
1437 1438 1439
		ret = -ENODEV;
	}

1440 1441 1442
out:
	kfree(id);
	return ret;
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
}

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)
{
1468 1469
	struct nvme_ns_head *head = NULL;
	struct nvme_ns *ns;
1470
	struct nvme_command c;
1471
	int srcu_idx, ret;
1472 1473
	u8 data[16] = { 0, };

1474 1475 1476 1477
	ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
	if (unlikely(!ns))
		return -EWOULDBLOCK;

1478 1479 1480 1481 1482
	put_unaligned_le64(key, &data[0]);
	put_unaligned_le64(sa_key, &data[8]);

	memset(&c, 0, sizeof(c));
	c.common.opcode = op;
1483
	c.common.nsid = cpu_to_le32(ns->head->ns_id);
1484 1485
	c.common.cdw10[0] = cpu_to_le32(cdw10);

1486
	ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1487 1488
	nvme_put_ns_from_disk(head, srcu_idx);
	return ret;
1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526
}

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)
{
1527
	u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544
	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,
};

1545
#ifdef CONFIG_BLK_SED_OPAL
1546 1547
int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
		bool send)
1548
{
1549
	struct nvme_ctrl *ctrl = data;
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
	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 */

1567
static const struct block_device_operations nvme_fops = {
1568 1569
	.owner		= THIS_MODULE,
	.ioctl		= nvme_ioctl,
1570
	.compat_ioctl	= nvme_ioctl,
1571 1572 1573 1574 1575 1576 1577
	.open		= nvme_open,
	.release	= nvme_release,
	.getgeo		= nvme_getgeo,
	.revalidate_disk= nvme_revalidate_disk,
	.pr_ops		= &nvme_pr_ops,
};

1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
#ifdef CONFIG_NVME_MULTIPATH
static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode)
{
	struct nvme_ns_head *head = bdev->bd_disk->private_data;

	if (!kref_get_unless_zero(&head->ref))
		return -ENXIO;
	return 0;
}

static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode)
{
	nvme_put_ns_head(disk->private_data);
}

const struct block_device_operations nvme_ns_head_ops = {
	.owner		= THIS_MODULE,
	.open		= nvme_ns_head_open,
	.release	= nvme_ns_head_release,
	.ioctl		= nvme_ioctl,
	.compat_ioctl	= nvme_ioctl,
	.getgeo		= nvme_getgeo,
	.pr_ops		= &nvme_pr_ops,
};
#endif /* CONFIG_NVME_MULTIPATH */

1604 1605 1606 1607 1608 1609 1610 1611
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
1612 1613
		if (csts == ~0)
			return -ENODEV;
1614 1615 1616 1617 1618 1619 1620
		if ((csts & NVME_CSTS_RDY) == bit)
			break;

		msleep(100);
		if (fatal_signal_pending(current))
			return -EINTR;
		if (time_after(jiffies, timeout)) {
1621
			dev_err(ctrl->device,
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
				"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;
1647

1648
	if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1649 1650
		msleep(NVME_QUIRK_DELAY_AMOUNT);

1651 1652
	return nvme_wait_ready(ctrl, cap, false);
}
1653
EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665

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) {
1666
		dev_err(ctrl->device,
1667 1668 1669 1670 1671 1672 1673 1674 1675
			"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;
1676
	ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1677 1678 1679 1680 1681 1682 1683 1684
	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);
}
1685
EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1686 1687 1688

int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
{
1689
	unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
	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)) {
1708
			dev_err(ctrl->device,
1709 1710 1711 1712 1713 1714 1715
				"Device shutdown incomplete; abort shutdown\n");
			return -ENODEV;
		}
	}

	return ret;
}
1716
EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1717

1718 1719 1720
static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
		struct request_queue *q)
{
1721 1722
	bool vwc = false;

1723
	if (ctrl->max_hw_sectors) {
1724 1725 1726
		u32 max_segments =
			(ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;

1727
		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1728
		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1729
	}
K
Keith Busch 已提交
1730 1731
	if (ctrl->quirks & NVME_QUIRK_STRIPE_SIZE)
		blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
1732
	blk_queue_virt_boundary(q, ctrl->page_size - 1);
1733 1734 1735
	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
		vwc = true;
	blk_queue_write_cache(q, vwc, vwc);
1736 1737
}

1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
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;
}

1755
static int nvme_configure_apst(struct nvme_ctrl *ctrl)
1756 1757 1758 1759 1760 1761 1762 1763
{
	/*
	 * 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
1764
	 * non-operational state after waiting 50 * (enlat + exlat)
1765
	 * microseconds, as long as that state's exit latency is under
1766 1767 1768 1769 1770 1771 1772 1773 1774
	 * 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;
1775 1776
	u64 max_lat_us = 0;
	int max_ps = -1;
1777 1778 1779 1780 1781 1782 1783
	int ret;

	/*
	 * If APST isn't supported or if we haven't been initialized yet,
	 * then don't do anything.
	 */
	if (!ctrl->apsta)
1784
		return 0;
1785 1786 1787

	if (ctrl->npss > 31) {
		dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
1788
		return 0;
1789 1790 1791 1792
	}

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
1793
		return 0;
1794

1795
	if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
1796 1797
		/* Turn off APST. */
		apste = 0;
1798
		dev_dbg(ctrl->device, "APST disabled\n");
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
	} 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--) {
1810
			u64 total_latency_us, exit_latency_us, transition_ms;
1811 1812 1813 1814

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

1815 1816 1817 1818 1819 1820 1821 1822
			/*
			 * 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;

1823 1824 1825 1826 1827 1828 1829 1830
			/*
			 * 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;

1831 1832 1833
			exit_latency_us =
				(u64)le32_to_cpu(ctrl->psd[state].exit_lat);
			if (exit_latency_us > ctrl->ps_max_latency_us)
1834 1835
				continue;

1836 1837 1838 1839
			total_latency_us =
				exit_latency_us +
				le32_to_cpu(ctrl->psd[state].entry_lat);

1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
			/*
			 * 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));
1851 1852 1853 1854 1855 1856

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

			if (total_latency_us > max_lat_us)
				max_lat_us = total_latency_us;
1857 1858 1859
		}

		apste = 1;
1860 1861 1862 1863 1864 1865 1866

		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);
		}
1867 1868 1869 1870 1871 1872 1873 1874
	}

	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);
1875
	return ret;
1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898
}

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);
	}
}

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
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[] = {
1912
	{
1913 1914 1915 1916 1917 1918
		/*
		 * 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",
1919
		.quirks = NVME_QUIRK_NO_APST,
1920
	}
1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
};

/* 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));
}

C
Christoph Hellwig 已提交
1952 1953
static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
		struct nvme_id_ctrl *id)
1954 1955 1956 1957 1958 1959
{
	size_t nqnlen;
	int off;

	nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
	if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
C
Christoph Hellwig 已提交
1960
		strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
1961 1962 1963 1964 1965 1966 1967
		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 */
C
Christoph Hellwig 已提交
1968
	off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
1969 1970
			"nqn.2014.08.org.nvmexpress:%4x%4x",
			le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
C
Christoph Hellwig 已提交
1971
	memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
1972
	off += sizeof(id->sn);
C
Christoph Hellwig 已提交
1973
	memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
1974
	off += sizeof(id->mn);
C
Christoph Hellwig 已提交
1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997
	memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
}

static void __nvme_release_subsystem(struct nvme_subsystem *subsys)
{
	ida_simple_remove(&nvme_subsystems_ida, subsys->instance);
	kfree(subsys);
}

static void nvme_release_subsystem(struct device *dev)
{
	__nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev));
}

static void nvme_destroy_subsystem(struct kref *ref)
{
	struct nvme_subsystem *subsys =
			container_of(ref, struct nvme_subsystem, ref);

	mutex_lock(&nvme_subsystems_lock);
	list_del(&subsys->entry);
	mutex_unlock(&nvme_subsystems_lock);

C
Christoph Hellwig 已提交
1998
	ida_destroy(&subsys->ns_ida);
C
Christoph Hellwig 已提交
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
	device_del(&subsys->dev);
	put_device(&subsys->dev);
}

static void nvme_put_subsystem(struct nvme_subsystem *subsys)
{
	kref_put(&subsys->ref, nvme_destroy_subsystem);
}

static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
{
	struct nvme_subsystem *subsys;

	lockdep_assert_held(&nvme_subsystems_lock);

	list_for_each_entry(subsys, &nvme_subsystems, entry) {
		if (strcmp(subsys->subnqn, subsysnqn))
			continue;
		if (!kref_get_unless_zero(&subsys->ref))
			continue;
		return subsys;
	}

	return NULL;
}

2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071
#define SUBSYS_ATTR_RO(_name, _mode, _show)			\
	struct device_attribute subsys_attr_##_name = \
		__ATTR(_name, _mode, _show, NULL)

static ssize_t nvme_subsys_show_nqn(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
	struct nvme_subsystem *subsys =
		container_of(dev, struct nvme_subsystem, dev);

	return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn);
}
static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn);

#define nvme_subsys_show_str_function(field)				\
static ssize_t subsys_##field##_show(struct device *dev,		\
			    struct device_attribute *attr, char *buf)	\
{									\
	struct nvme_subsystem *subsys =					\
		container_of(dev, struct nvme_subsystem, dev);		\
	return sprintf(buf, "%.*s\n",					\
		       (int)sizeof(subsys->field), subsys->field);	\
}									\
static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show);

nvme_subsys_show_str_function(model);
nvme_subsys_show_str_function(serial);
nvme_subsys_show_str_function(firmware_rev);

static struct attribute *nvme_subsys_attrs[] = {
	&subsys_attr_model.attr,
	&subsys_attr_serial.attr,
	&subsys_attr_firmware_rev.attr,
	&subsys_attr_subsysnqn.attr,
	NULL,
};

static struct attribute_group nvme_subsys_attrs_group = {
	.attrs = nvme_subsys_attrs,
};

static const struct attribute_group *nvme_subsys_attrs_groups[] = {
	&nvme_subsys_attrs_group,
	NULL,
};

C
Christoph Hellwig 已提交
2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
{
	struct nvme_subsystem *subsys, *found;
	int ret;

	subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
	if (!subsys)
		return -ENOMEM;
	ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL);
	if (ret < 0) {
		kfree(subsys);
		return ret;
	}
	subsys->instance = ret;
	mutex_init(&subsys->lock);
	kref_init(&subsys->ref);
	INIT_LIST_HEAD(&subsys->ctrls);
C
Christoph Hellwig 已提交
2089
	INIT_LIST_HEAD(&subsys->nsheads);
C
Christoph Hellwig 已提交
2090 2091 2092 2093 2094 2095 2096 2097 2098
	nvme_init_subnqn(subsys, ctrl, id);
	memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
	memcpy(subsys->model, id->mn, sizeof(subsys->model));
	memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev));
	subsys->vendor_id = le16_to_cpu(id->vid);
	subsys->cmic = id->cmic;

	subsys->dev.class = nvme_subsys_class;
	subsys->dev.release = nvme_release_subsystem;
2099
	subsys->dev.groups = nvme_subsys_attrs_groups;
C
Christoph Hellwig 已提交
2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127
	dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance);
	device_initialize(&subsys->dev);

	mutex_lock(&nvme_subsystems_lock);
	found = __nvme_find_get_subsystem(subsys->subnqn);
	if (found) {
		/*
		 * Verify that the subsystem actually supports multiple
		 * controllers, else bail out.
		 */
		if (!(id->cmic & (1 << 1))) {
			dev_err(ctrl->device,
				"ignoring ctrl due to duplicate subnqn (%s).\n",
				found->subnqn);
			nvme_put_subsystem(found);
			ret = -EINVAL;
			goto out_unlock;
		}

		__nvme_release_subsystem(subsys);
		subsys = found;
	} else {
		ret = device_add(&subsys->dev);
		if (ret) {
			dev_err(ctrl->device,
				"failed to register subsystem device.\n");
			goto out_unlock;
		}
C
Christoph Hellwig 已提交
2128
		ida_init(&subsys->ns_ida);
C
Christoph Hellwig 已提交
2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152
		list_add_tail(&subsys->entry, &nvme_subsystems);
	}

	ctrl->subsys = subsys;
	mutex_unlock(&nvme_subsystems_lock);

	if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
			dev_name(ctrl->device))) {
		dev_err(ctrl->device,
			"failed to create sysfs link from subsystem.\n");
		/* the transport driver will eventually put the subsystem */
		return -EINVAL;
	}

	mutex_lock(&subsys->lock);
	list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
	mutex_unlock(&subsys->lock);

	return 0;

out_unlock:
	mutex_unlock(&nvme_subsystems_lock);
	put_device(&subsys->dev);
	return ret;
2153 2154
}

K
Keith Busch 已提交
2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
static int nvme_get_log(struct nvme_ctrl *ctrl, u8 log_page, void *log,
			size_t size)
{
	struct nvme_command c = { };

	c.common.opcode = nvme_admin_get_log_page;
	c.common.nsid = cpu_to_le32(NVME_NSID_ALL);
	c.common.cdw10[0] = nvme_get_log_dw10(log_page, size);

	return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size);
}

2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183
static int nvme_get_effects_log(struct nvme_ctrl *ctrl)
{
	int ret;

	if (!ctrl->effects)
		ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL);

	if (!ctrl->effects)
		return 0;

	ret = nvme_get_log(ctrl, NVME_LOG_CMD_EFFECTS, ctrl->effects,
					sizeof(*ctrl->effects));
	if (ret) {
		kfree(ctrl->effects);
		ctrl->effects = NULL;
	}
	return ret;
2184 2185
}

2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
/*
 * 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;
2196
	u32 max_hw_sectors;
2197
	bool prev_apst_enabled;
2198

2199 2200
	ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
	if (ret) {
2201
		dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2202 2203 2204
		return ret;
	}

2205 2206
	ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
	if (ret) {
2207
		dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
2208 2209 2210 2211
		return ret;
	}
	page_shift = NVME_CAP_MPSMIN(cap) + 12;

2212
	if (ctrl->vs >= NVME_VS(1, 1, 0))
2213 2214
		ctrl->subsystem = NVME_CAP_NSSRC(cap);

2215 2216
	ret = nvme_identify_ctrl(ctrl, &id);
	if (ret) {
2217
		dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2218 2219 2220
		return -EIO;
	}

2221 2222 2223 2224 2225
	if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
		ret = nvme_get_effects_log(ctrl);
		if (ret < 0)
			return ret;
	}
2226

2227
	if (!ctrl->identified) {
C
Christoph Hellwig 已提交
2228 2229 2230 2231 2232 2233
		int i;

		ret = nvme_init_subsystem(ctrl, id);
		if (ret)
			goto out_free;

2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247
		/*
		 * 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.
		 */
		for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
			if (quirk_matches(id, &core_quirks[i]))
				ctrl->quirks |= core_quirks[i].quirks;
		}
	}

2248
	if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2249
		dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2250 2251 2252
		ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
	}

2253
	ctrl->oacs = le16_to_cpu(id->oacs);
2254
	ctrl->oncs = le16_to_cpup(&id->oncs);
2255
	atomic_set(&ctrl->abort_limit, id->acl + 1);
2256
	ctrl->vwc = id->vwc;
M
Ming Lin 已提交
2257
	ctrl->cntlid = le16_to_cpup(&id->cntlid);
2258
	if (id->mdts)
2259
		max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2260
	else
2261 2262 2263
		max_hw_sectors = UINT_MAX;
	ctrl->max_hw_sectors =
		min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2264

2265
	nvme_set_queue_limits(ctrl, ctrl->admin_q);
2266
	ctrl->sgls = le32_to_cpu(id->sgls);
S
Sagi Grimberg 已提交
2267
	ctrl->kas = le16_to_cpu(id->kas);
2268

2269 2270 2271 2272 2273 2274 2275 2276
	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)
2277
			dev_info(ctrl->device,
2278 2279 2280 2281 2282
				 "Shutdown timeout set to %u seconds\n",
				 ctrl->shutdown_timeout);
	} else
		ctrl->shutdown_timeout = shutdown_timeout;

2283
	ctrl->npss = id->npss;
2284 2285
	ctrl->apsta = id->apsta;
	prev_apst_enabled = ctrl->apst_enabled;
2286 2287
	if (ctrl->quirks & NVME_QUIRK_NO_APST) {
		if (force_apst && id->apsta) {
2288
			dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2289
			ctrl->apst_enabled = true;
2290
		} else {
2291
			ctrl->apst_enabled = false;
2292 2293
		}
	} else {
2294
		ctrl->apst_enabled = id->apsta;
2295
	}
2296 2297
	memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));

2298
	if (ctrl->ops->flags & NVME_F_FABRICS) {
2299 2300 2301 2302 2303 2304 2305 2306 2307
		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
		 */
2308
		if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2309
			ret = -EINVAL;
2310 2311
			goto out_free;
		}
S
Sagi Grimberg 已提交
2312 2313

		if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2314
			dev_err(ctrl->device,
S
Sagi Grimberg 已提交
2315 2316
				"keep-alive support is mandatory for fabrics\n");
			ret = -EINVAL;
2317
			goto out_free;
S
Sagi Grimberg 已提交
2318
		}
2319 2320
	} else {
		ctrl->cntlid = le16_to_cpu(id->cntlid);
2321 2322
		ctrl->hmpre = le32_to_cpu(id->hmpre);
		ctrl->hmmin = le32_to_cpu(id->hmmin);
2323 2324
		ctrl->hmminds = le32_to_cpu(id->hmminds);
		ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2325
	}
2326

2327
	kfree(id);
2328

2329
	if (ctrl->apst_enabled && !prev_apst_enabled)
2330
		dev_pm_qos_expose_latency_tolerance(ctrl->device);
2331
	else if (!ctrl->apst_enabled && prev_apst_enabled)
2332 2333
		dev_pm_qos_hide_latency_tolerance(ctrl->device);

2334 2335 2336
	ret = nvme_configure_apst(ctrl);
	if (ret < 0)
		return ret;
2337 2338 2339 2340
	
	ret = nvme_configure_timestamp(ctrl);
	if (ret < 0)
		return ret;
2341 2342 2343 2344

	ret = nvme_configure_directives(ctrl);
	if (ret < 0)
		return ret;
2345

2346
	ctrl->identified = true;
2347

2348 2349 2350 2351
	return 0;

out_free:
	kfree(id);
2352
	return ret;
2353
}
2354
EXPORT_SYMBOL_GPL(nvme_init_identify);
2355

2356
static int nvme_dev_open(struct inode *inode, struct file *file)
2357
{
2358 2359
	struct nvme_ctrl *ctrl =
		container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2360

2361 2362 2363 2364 2365
	switch (ctrl->state) {
	case NVME_CTRL_LIVE:
	case NVME_CTRL_ADMIN_ONLY:
		break;
	default:
2366
		return -EWOULDBLOCK;
2367 2368
	}

2369
	file->private_data = ctrl;
2370 2371 2372
	return 0;
}

2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385
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)) {
2386
		dev_warn(ctrl->device,
2387 2388 2389 2390 2391
			"NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
		ret = -EINVAL;
		goto out_unlock;
	}

2392
	dev_warn(ctrl->device,
2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405
		"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;
}

2406 2407 2408 2409 2410 2411 2412 2413 2414 2415
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:
2416
		return nvme_dev_user_cmd(ctrl, argp);
2417
	case NVME_IOCTL_RESET:
2418
		dev_warn(ctrl->device, "resetting controller\n");
2419
		return nvme_reset_ctrl_sync(ctrl);
2420 2421
	case NVME_IOCTL_SUBSYS_RESET:
		return nvme_reset_subsystem(ctrl);
K
Keith Busch 已提交
2422 2423 2424
	case NVME_IOCTL_RESCAN:
		nvme_queue_scan(ctrl);
		return 0;
2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443
	default:
		return -ENOTTY;
	}
}

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

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

2444
	ret = nvme_reset_ctrl_sync(ctrl);
2445 2446 2447
	if (ret < 0)
		return ret;
	return count;
2448
}
2449
static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2450

K
Keith Busch 已提交
2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461
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);

2462 2463 2464 2465 2466 2467 2468 2469 2470 2471
static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev)
{
	struct gendisk *disk = dev_to_disk(dev);

	if (disk->fops == &nvme_fops)
		return nvme_get_ns_from_dev(dev)->head;
	else
		return disk->private_data;
}

2472
static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
2473
		char *buf)
2474
{
2475 2476 2477
	struct nvme_ns_head *head = dev_to_ns_head(dev);
	struct nvme_ns_ids *ids = &head->ids;
	struct nvme_subsystem *subsys = head->subsys;
C
Christoph Hellwig 已提交
2478 2479
	int serial_len = sizeof(subsys->serial);
	int model_len = sizeof(subsys->model);
2480

2481 2482
	if (!uuid_is_null(&ids->uuid))
		return sprintf(buf, "uuid.%pU\n", &ids->uuid);
2483

2484 2485
	if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
		return sprintf(buf, "eui.%16phN\n", ids->nguid);
2486

2487 2488
	if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
		return sprintf(buf, "eui.%8phN\n", ids->eui64);
2489

C
Christoph Hellwig 已提交
2490 2491
	while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
				  subsys->serial[serial_len - 1] == '\0'))
2492
		serial_len--;
C
Christoph Hellwig 已提交
2493 2494
	while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
				 subsys->model[model_len - 1] == '\0'))
2495 2496
		model_len--;

C
Christoph Hellwig 已提交
2497 2498
	return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
		serial_len, subsys->serial, model_len, subsys->model,
2499
		head->ns_id);
2500 2501 2502
}
static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);

2503
static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
2504
		char *buf)
2505
{
2506
	return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
2507 2508 2509
}
static DEVICE_ATTR(nguid, S_IRUGO, nguid_show, NULL);

2510
static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
2511
		char *buf)
2512
{
2513
	struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2514 2515 2516 2517

	/* For backward compatibility expose the NGUID to userspace if
	 * we have no UUID set
	 */
2518
	if (uuid_is_null(&ids->uuid)) {
2519 2520
		printk_ratelimited(KERN_WARNING
				   "No UUID available providing old NGUID\n");
2521
		return sprintf(buf, "%pU\n", ids->nguid);
2522
	}
2523
	return sprintf(buf, "%pU\n", &ids->uuid);
2524 2525 2526 2527
}
static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);

static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
2528
		char *buf)
2529
{
2530
	return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
2531 2532 2533 2534
}
static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);

static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
2535
		char *buf)
2536
{
2537
	return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
2538 2539 2540
}
static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);

2541
static struct attribute *nvme_ns_id_attrs[] = {
2542
	&dev_attr_wwid.attr,
2543
	&dev_attr_uuid.attr,
2544
	&dev_attr_nguid.attr,
2545 2546 2547 2548 2549
	&dev_attr_eui.attr,
	&dev_attr_nsid.attr,
	NULL,
};

2550
static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
2551 2552 2553
		struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
2554
	struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2555 2556

	if (a == &dev_attr_uuid.attr) {
2557
		if (uuid_is_null(&ids->uuid) &&
2558
		    !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2559 2560 2561
			return 0;
	}
	if (a == &dev_attr_nguid.attr) {
2562
		if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2563 2564 2565
			return 0;
	}
	if (a == &dev_attr_eui.attr) {
2566
		if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2567 2568 2569 2570 2571
			return 0;
	}
	return a->mode;
}

2572 2573 2574
const struct attribute_group nvme_ns_id_attr_group = {
	.attrs		= nvme_ns_id_attrs,
	.is_visible	= nvme_ns_id_attrs_are_visible,
2575 2576
};

M
Ming Lin 已提交
2577
#define nvme_show_str_function(field)						\
2578 2579 2580 2581
static ssize_t  field##_show(struct device *dev,				\
			    struct device_attribute *attr, char *buf)		\
{										\
        struct nvme_ctrl *ctrl = dev_get_drvdata(dev);				\
C
Christoph Hellwig 已提交
2582 2583
        return sprintf(buf, "%.*s\n",						\
		(int)sizeof(ctrl->subsys->field), ctrl->subsys->field);		\
2584 2585 2586
}										\
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);

C
Christoph Hellwig 已提交
2587 2588 2589 2590
nvme_show_str_function(model);
nvme_show_str_function(serial);
nvme_show_str_function(firmware_rev);

M
Ming Lin 已提交
2591 2592 2593 2594 2595 2596 2597 2598 2599 2600
#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_int_function(cntlid);
2601

M
Ming Lin 已提交
2602 2603 2604 2605 2606 2607 2608
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))
2609
		nvme_delete_ctrl_sync(ctrl);
M
Ming Lin 已提交
2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
	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);

2624 2625 2626 2627 2628 2629 2630 2631
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",
2632
		[NVME_CTRL_ADMIN_ONLY]	= "only-admin",
2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647
		[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
2648 2649 2650 2651 2652 2653
static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct nvme_ctrl *ctrl = dev_get_drvdata(dev);

C
Christoph Hellwig 已提交
2654
	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
M
Ming Lin 已提交
2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
}
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);

2668 2669
static struct attribute *nvme_dev_attrs[] = {
	&dev_attr_reset_controller.attr,
K
Keith Busch 已提交
2670
	&dev_attr_rescan_controller.attr,
2671 2672 2673
	&dev_attr_model.attr,
	&dev_attr_serial.attr,
	&dev_attr_firmware_rev.attr,
M
Ming Lin 已提交
2674
	&dev_attr_cntlid.attr,
M
Ming Lin 已提交
2675 2676 2677 2678
	&dev_attr_delete_controller.attr,
	&dev_attr_transport.attr,
	&dev_attr_subsysnqn.attr,
	&dev_attr_address.attr,
2679
	&dev_attr_state.attr,
2680 2681 2682
	NULL
};

M
Ming Lin 已提交
2683 2684 2685 2686 2687 2688
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);

2689 2690 2691 2692
	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
2693 2694 2695 2696

	return a->mode;
}

2697
static struct attribute_group nvme_dev_attrs_group = {
M
Ming Lin 已提交
2698 2699
	.attrs		= nvme_dev_attrs,
	.is_visible	= nvme_dev_attrs_are_visible,
2700 2701 2702 2703 2704 2705 2706
};

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

C
Christoph Hellwig 已提交
2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765
static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys,
		unsigned nsid)
{
	struct nvme_ns_head *h;

	lockdep_assert_held(&subsys->lock);

	list_for_each_entry(h, &subsys->nsheads, entry) {
		if (h->ns_id == nsid && kref_get_unless_zero(&h->ref))
			return h;
	}

	return NULL;
}

static int __nvme_check_ids(struct nvme_subsystem *subsys,
		struct nvme_ns_head *new)
{
	struct nvme_ns_head *h;

	lockdep_assert_held(&subsys->lock);

	list_for_each_entry(h, &subsys->nsheads, entry) {
		if (nvme_ns_ids_valid(&new->ids) &&
		    nvme_ns_ids_equal(&new->ids, &h->ids))
			return -EINVAL;
	}

	return 0;
}

static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl,
		unsigned nsid, struct nvme_id_ns *id)
{
	struct nvme_ns_head *head;
	int ret = -ENOMEM;

	head = kzalloc(sizeof(*head), GFP_KERNEL);
	if (!head)
		goto out;
	ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL);
	if (ret < 0)
		goto out_free_head;
	head->instance = ret;
	INIT_LIST_HEAD(&head->list);
	init_srcu_struct(&head->srcu);
	head->subsys = ctrl->subsys;
	head->ns_id = nsid;
	kref_init(&head->ref);

	nvme_report_ns_ids(ctrl, nsid, id, &head->ids);

	ret = __nvme_check_ids(ctrl->subsys, head);
	if (ret) {
		dev_err(ctrl->device,
			"duplicate IDs for nsid %d\n", nsid);
		goto out_cleanup_srcu;
	}

2766 2767 2768 2769
	ret = nvme_mpath_alloc_disk(ctrl, head);
	if (ret)
		goto out_cleanup_srcu;

C
Christoph Hellwig 已提交
2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822
	list_add_tail(&head->entry, &ctrl->subsys->nsheads);
	return head;
out_cleanup_srcu:
	cleanup_srcu_struct(&head->srcu);
	ida_simple_remove(&ctrl->subsys->ns_ida, head->instance);
out_free_head:
	kfree(head);
out:
	return ERR_PTR(ret);
}

static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
		struct nvme_id_ns *id, bool *new)
{
	struct nvme_ctrl *ctrl = ns->ctrl;
	bool is_shared = id->nmic & (1 << 0);
	struct nvme_ns_head *head = NULL;
	int ret = 0;

	mutex_lock(&ctrl->subsys->lock);
	if (is_shared)
		head = __nvme_find_ns_head(ctrl->subsys, nsid);
	if (!head) {
		head = nvme_alloc_ns_head(ctrl, nsid, id);
		if (IS_ERR(head)) {
			ret = PTR_ERR(head);
			goto out_unlock;
		}

		*new = true;
	} else {
		struct nvme_ns_ids ids;

		nvme_report_ns_ids(ctrl, nsid, id, &ids);
		if (!nvme_ns_ids_equal(&head->ids, &ids)) {
			dev_err(ctrl->device,
				"IDs don't match for shared namespace %d\n",
					nsid);
			ret = -EINVAL;
			goto out_unlock;
		}

		*new = false;
	}

	list_add_tail(&ns->siblings, &head->list);
	ns->head = head;

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

2823 2824 2825 2826 2827
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);

C
Christoph Hellwig 已提交
2828
	return nsa->head->ns_id - nsb->head->ns_id;
2829 2830
}

2831
static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
2832
{
2833
	struct nvme_ns *ns, *ret = NULL;
2834

2835
	mutex_lock(&ctrl->namespaces_mutex);
2836
	list_for_each_entry(ns, &ctrl->namespaces, list) {
C
Christoph Hellwig 已提交
2837
		if (ns->head->ns_id == nsid) {
2838 2839
			if (!kref_get_unless_zero(&ns->kref))
				continue;
2840 2841 2842
			ret = ns;
			break;
		}
C
Christoph Hellwig 已提交
2843
		if (ns->head->ns_id > nsid)
2844 2845
			break;
	}
2846 2847
	mutex_unlock(&ctrl->namespaces_mutex);
	return ret;
2848 2849
}

2850 2851 2852 2853 2854 2855 2856 2857
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;

C
Christoph Hellwig 已提交
2858
	ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875
	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;
}

2876 2877 2878 2879
static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;
	struct gendisk *disk;
2880 2881
	struct nvme_id_ns *id;
	char disk_name[DISK_NAME_LEN];
2882
	int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT;
C
Christoph Hellwig 已提交
2883
	bool new = true;
2884 2885 2886 2887 2888 2889 2890

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

	ns->queue = blk_mq_init_queue(ctrl->tagset);
	if (IS_ERR(ns->queue))
C
Christoph Hellwig 已提交
2891
		goto out_free_ns;
2892 2893 2894 2895 2896 2897 2898 2899
	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
	ns->queue->queuedata = ns;
	ns->ctrl = ctrl;

	kref_init(&ns->kref);
	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);
2900
	nvme_set_queue_limits(ctrl, ns->queue);
2901
	nvme_setup_streams_ns(ctrl, ns);
2902

2903 2904
	id = nvme_identify_ns(ctrl, nsid);
	if (!id)
2905 2906
		goto out_free_queue;

2907 2908 2909
	if (id->ncap == 0)
		goto out_free_id;

C
Christoph Hellwig 已提交
2910 2911 2912
	if (nvme_init_ns_head(ns, nsid, id, &new))
		goto out_free_id;
	
2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934
#ifdef CONFIG_NVME_MULTIPATH
	/*
	 * If multipathing is enabled we need to always use the subsystem
	 * instance number for numbering our devices to avoid conflicts
	 * between subsystems that have multiple controllers and thus use
	 * the multipath-aware subsystem node and those that have a single
	 * controller and use the controller node directly.
	 */
	if (ns->head->disk) {
		sprintf(disk_name, "nvme%dc%dn%d", ctrl->subsys->instance,
				ctrl->cntlid, ns->head->instance);
		flags = GENHD_FL_HIDDEN;
	} else {
		sprintf(disk_name, "nvme%dn%d", ctrl->subsys->instance,
				ns->head->instance);
	}
#else
	/*
	 * But without the multipath code enabled, multiple controller per
	 * subsystems are visible as devices and thus we cannot use the
	 * subsystem instance.
	 */
C
Christoph Hellwig 已提交
2935
	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
2936
#endif
2937

C
Christoph Hellwig 已提交
2938 2939 2940
	if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
		if (nvme_nvm_register(ns, disk_name, node)) {
			dev_warn(ctrl->device, "LightNVM init failure\n");
C
Christoph Hellwig 已提交
2941
			goto out_unlink_ns;
C
Christoph Hellwig 已提交
2942
		}
2943
	}
2944

2945 2946
	disk = alloc_disk_node(0, node);
	if (!disk)
C
Christoph Hellwig 已提交
2947
		goto out_unlink_ns;
2948

2949 2950 2951
	disk->fops = &nvme_fops;
	disk->private_data = ns;
	disk->queue = ns->queue;
2952
	disk->flags = flags;
2953 2954 2955 2956
	memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
	ns->disk = disk;

	__nvme_revalidate_disk(disk, id);
2957

2958 2959 2960 2961
	mutex_lock(&ctrl->namespaces_mutex);
	list_add_tail(&ns->list, &ctrl->namespaces);
	mutex_unlock(&ctrl->namespaces_mutex);

2962
	nvme_get_ctrl(ctrl);
2963 2964 2965

	kfree(id);

2966
	device_add_disk(ctrl->device, ns->disk);
2967
	if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
2968
					&nvme_ns_id_attr_group))
2969 2970
		pr_warn("%s: failed to create sysfs group for identification\n",
			ns->disk->disk_name);
2971 2972 2973
	if (ns->ndev && nvme_nvm_register_sysfs(ns))
		pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
			ns->disk->disk_name);
2974 2975 2976

	if (new)
		nvme_mpath_add_disk(ns->head);
2977
	nvme_mpath_add_disk_links(ns);
2978
	return;
C
Christoph Hellwig 已提交
2979 2980 2981 2982
 out_unlink_ns:
	mutex_lock(&ctrl->subsys->lock);
	list_del_rcu(&ns->siblings);
	mutex_unlock(&ctrl->subsys->lock);
2983 2984
 out_free_id:
	kfree(id);
2985 2986 2987 2988 2989 2990 2991 2992
 out_free_queue:
	blk_cleanup_queue(ns->queue);
 out_free_ns:
	kfree(ns);
}

static void nvme_ns_remove(struct nvme_ns *ns)
{
2993 2994
	if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
		return;
2995

2996
	if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
2997 2998
		if (blk_get_integrity(ns->disk))
			blk_integrity_unregister(ns->disk);
2999
		nvme_mpath_remove_disk_links(ns);
3000
		sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
3001
					&nvme_ns_id_attr_group);
3002 3003
		if (ns->ndev)
			nvme_nvm_unregister_sysfs(ns);
3004 3005 3006
		del_gendisk(ns->disk);
		blk_cleanup_queue(ns->queue);
	}
3007

C
Christoph Hellwig 已提交
3008
	mutex_lock(&ns->ctrl->subsys->lock);
3009
	nvme_mpath_clear_current_path(ns);
3010
	list_del_rcu(&ns->siblings);
C
Christoph Hellwig 已提交
3011 3012
	mutex_unlock(&ns->ctrl->subsys->lock);

3013
	mutex_lock(&ns->ctrl->namespaces_mutex);
3014
	list_del_init(&ns->list);
3015 3016
	mutex_unlock(&ns->ctrl->namespaces_mutex);

3017
	synchronize_srcu(&ns->head->srcu);
3018 3019 3020
	nvme_put_ns(ns);
}

3021 3022 3023 3024
static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;

3025
	ns = nvme_find_get_ns(ctrl, nsid);
3026
	if (ns) {
3027
		if (ns->disk && revalidate_disk(ns->disk))
3028
			nvme_ns_remove(ns);
3029
		nvme_put_ns(ns);
3030 3031 3032 3033
	} else
		nvme_alloc_ns(ctrl, nsid);
}

3034 3035 3036 3037 3038 3039
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) {
C
Christoph Hellwig 已提交
3040
		if (ns->head->ns_id > nsid)
3041 3042 3043 3044
			nvme_ns_remove(ns);
	}
}

3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058
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)
3059
			goto free;
3060 3061 3062 3063 3064 3065 3066 3067 3068

		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) {
3069 3070
				ns = nvme_find_get_ns(ctrl, prev);
				if (ns) {
3071
					nvme_ns_remove(ns);
3072 3073
					nvme_put_ns(ns);
				}
3074 3075 3076 3077 3078
			}
		}
		nn -= j;
	}
 out:
3079 3080
	nvme_remove_invalid_namespaces(ctrl, prev);
 free:
3081 3082 3083 3084
	kfree(ns_list);
	return ret;
}

3085
static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
3086 3087 3088
{
	unsigned i;

3089 3090 3091
	for (i = 1; i <= nn; i++)
		nvme_validate_ns(ctrl, i);

3092
	nvme_remove_invalid_namespaces(ctrl, nn);
3093 3094
}

3095
static void nvme_scan_work(struct work_struct *work)
3096
{
3097 3098
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, scan_work);
3099
	struct nvme_id_ctrl *id;
3100
	unsigned nn;
3101

3102 3103 3104
	if (ctrl->state != NVME_CTRL_LIVE)
		return;

3105 3106
	WARN_ON_ONCE(!ctrl->tagset);

3107 3108
	if (nvme_identify_ctrl(ctrl, &id))
		return;
3109 3110

	nn = le32_to_cpu(id->nn);
3111
	if (ctrl->vs >= NVME_VS(1, 1, 0) &&
3112 3113 3114 3115
	    !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
		if (!nvme_scan_ns_list(ctrl, nn))
			goto done;
	}
3116
	nvme_scan_ns_sequential(ctrl, nn);
3117
 done:
3118
	mutex_lock(&ctrl->namespaces_mutex);
3119
	list_sort(NULL, &ctrl->namespaces, ns_cmp);
3120
	mutex_unlock(&ctrl->namespaces_mutex);
3121 3122
	kfree(id);
}
3123 3124 3125 3126

void nvme_queue_scan(struct nvme_ctrl *ctrl)
{
	/*
3127
	 * Only new queue scan work when admin and IO queues are both alive
3128 3129
	 */
	if (ctrl->state == NVME_CTRL_LIVE)
3130
		queue_work(nvme_wq, &ctrl->scan_work);
3131 3132
}
EXPORT_SYMBOL_GPL(nvme_queue_scan);
3133

3134 3135 3136 3137 3138
/*
 * 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.
 */
3139 3140 3141 3142
void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns, *next;

3143 3144 3145 3146 3147 3148 3149 3150 3151
	/*
	 * 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);

3152 3153 3154
	list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
		nvme_ns_remove(ns);
}
3155
EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3156

3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172
static void nvme_aen_uevent(struct nvme_ctrl *ctrl)
{
	char *envp[2] = { NULL, NULL };
	u32 aen_result = ctrl->aen_result;

	ctrl->aen_result = 0;
	if (!aen_result)
		return;

	envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result);
	if (!envp[0])
		return;
	kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp);
	kfree(envp[0]);
}

3173 3174 3175 3176 3177
static void nvme_async_event_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, async_event_work);

3178
	nvme_aen_uevent(ctrl);
3179
	ctrl->ops->submit_async_event(ctrl);
3180 3181
}

3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203
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_fw_slot_info_log *log;

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

K
Keith Busch 已提交
3204
	if (nvme_get_log(ctrl, NVME_LOG_FW_SLOT, log, sizeof(*log)))
3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237
		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);
3238
	/* read FW slot information to clear the AER */
3239 3240 3241
	nvme_get_fw_slot_info(ctrl);
}

3242 3243
void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
		union nvme_result *res)
3244
{
3245
	u32 result = le32_to_cpu(res->u32);
3246

3247
	if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
3248 3249
		return;

3250 3251 3252 3253 3254 3255
	switch (result & 0x7) {
	case NVME_AER_ERROR:
	case NVME_AER_SMART:
	case NVME_AER_CSS:
	case NVME_AER_VS:
		ctrl->aen_result = result;
3256 3257 3258
		break;
	default:
		break;
3259 3260 3261 3262 3263 3264 3265
	}

	switch (result & 0xff07) {
	case NVME_AER_NOTICE_NS_CHANGED:
		dev_info(ctrl->device, "rescanning\n");
		nvme_queue_scan(ctrl);
		break;
3266
	case NVME_AER_NOTICE_FW_ACT_STARTING:
3267
		queue_work(nvme_wq, &ctrl->fw_act_work);
3268
		break;
3269 3270 3271
	default:
		dev_warn(ctrl->device, "async event result %08x\n", result);
	}
3272
	queue_work(nvme_wq, &ctrl->async_event_work);
3273 3274
}
EXPORT_SYMBOL_GPL(nvme_complete_async_event);
3275

3276
void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
3277
{
3278
	nvme_stop_keep_alive(ctrl);
3279
	flush_work(&ctrl->async_event_work);
3280
	flush_work(&ctrl->scan_work);
3281
	cancel_work_sync(&ctrl->fw_act_work);
3282 3283 3284 3285 3286 3287 3288 3289 3290 3291
}
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);
3292
		queue_work(nvme_wq, &ctrl->async_event_work);
3293 3294 3295 3296
		nvme_start_queues(ctrl);
	}
}
EXPORT_SYMBOL_GPL(nvme_start_ctrl);
3297

3298 3299
void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
{
3300
	cdev_device_del(&ctrl->cdev, ctrl->device);
3301
}
3302
EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
3303

3304
static void nvme_free_ctrl(struct device *dev)
3305
{
3306 3307
	struct nvme_ctrl *ctrl =
		container_of(dev, struct nvme_ctrl, ctrl_device);
C
Christoph Hellwig 已提交
3308
	struct nvme_subsystem *subsys = ctrl->subsys;
3309

3310
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3311
	kfree(ctrl->effects);
3312

C
Christoph Hellwig 已提交
3313 3314 3315 3316 3317 3318
	if (subsys) {
		mutex_lock(&subsys->lock);
		list_del(&ctrl->subsys_entry);
		mutex_unlock(&subsys->lock);
		sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
	}
3319 3320 3321

	ctrl->ops->free_ctrl(ctrl);

C
Christoph Hellwig 已提交
3322 3323
	if (subsys)
		nvme_put_subsystem(subsys);
3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335
}

/*
 * 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;

3336 3337
	ctrl->state = NVME_CTRL_NEW;
	spin_lock_init(&ctrl->lock);
3338
	INIT_LIST_HEAD(&ctrl->namespaces);
3339
	mutex_init(&ctrl->namespaces_mutex);
3340 3341 3342
	ctrl->dev = dev;
	ctrl->ops = ops;
	ctrl->quirks = quirks;
3343
	INIT_WORK(&ctrl->scan_work, nvme_scan_work);
3344
	INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
3345
	INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
3346
	INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
3347

3348 3349
	ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
	if (ret < 0)
3350
		goto out;
3351
	ctrl->instance = ret;
3352

3353 3354
	device_initialize(&ctrl->ctrl_device);
	ctrl->device = &ctrl->ctrl_device;
3355
	ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
3356 3357 3358 3359 3360 3361 3362
	ctrl->device->class = nvme_class;
	ctrl->device->parent = ctrl->dev;
	ctrl->device->groups = nvme_dev_attr_groups;
	ctrl->device->release = nvme_free_ctrl;
	dev_set_drvdata(ctrl->device, ctrl);
	ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance);
	if (ret)
3363 3364
		goto out_release_instance;

3365 3366 3367
	cdev_init(&ctrl->cdev, &nvme_dev_fops);
	ctrl->cdev.owner = ops->module;
	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
3368 3369
	if (ret)
		goto out_free_name;
3370

3371 3372 3373 3374 3375 3376 3377 3378
	/*
	 * 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));

3379
	return 0;
3380 3381
out_free_name:
	kfree_const(dev->kobj.name);
3382
out_release_instance:
3383
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3384 3385 3386
out:
	return ret;
}
3387
EXPORT_SYMBOL_GPL(nvme_init_ctrl);
3388

3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399
/**
 * 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;

3400
	mutex_lock(&ctrl->namespaces_mutex);
M
Ming Lei 已提交
3401

3402
	/* Forcibly unquiesce queues to avoid blocking dispatch */
3403 3404
	if (ctrl->admin_q)
		blk_mq_unquiesce_queue(ctrl->admin_q);
3405

3406
	list_for_each_entry(ns, &ctrl->namespaces, list) {
3407 3408 3409 3410
		/*
		 * Revalidating a dead namespace sets capacity to 0. This will
		 * end buffered writers dirtying pages that can't be synced.
		 */
3411 3412 3413
		if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
			continue;
		revalidate_disk(ns->disk);
3414
		blk_set_queue_dying(ns->queue);
3415

3416 3417
		/* Forcibly unquiesce queues to avoid blocking dispatch */
		blk_mq_unquiesce_queue(ns->queue);
3418
	}
3419
	mutex_unlock(&ctrl->namespaces_mutex);
3420
}
3421
EXPORT_SYMBOL_GPL(nvme_kill_queues);
3422

K
Keith Busch 已提交
3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464
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)
3465
		blk_freeze_queue_start(ns->queue);
K
Keith Busch 已提交
3466 3467 3468 3469
	mutex_unlock(&ctrl->namespaces_mutex);
}
EXPORT_SYMBOL_GPL(nvme_start_freeze);

3470
void nvme_stop_queues(struct nvme_ctrl *ctrl)
3471 3472 3473
{
	struct nvme_ns *ns;

3474
	mutex_lock(&ctrl->namespaces_mutex);
3475
	list_for_each_entry(ns, &ctrl->namespaces, list)
3476
		blk_mq_quiesce_queue(ns->queue);
3477
	mutex_unlock(&ctrl->namespaces_mutex);
3478
}
3479
EXPORT_SYMBOL_GPL(nvme_stop_queues);
3480

3481
void nvme_start_queues(struct nvme_ctrl *ctrl)
3482 3483 3484
{
	struct nvme_ns *ns;

3485
	mutex_lock(&ctrl->namespaces_mutex);
3486
	list_for_each_entry(ns, &ctrl->namespaces, list)
3487
		blk_mq_unquiesce_queue(ns->queue);
3488
	mutex_unlock(&ctrl->namespaces_mutex);
3489
}
3490
EXPORT_SYMBOL_GPL(nvme_start_queues);
3491

S
Sagi Grimberg 已提交
3492 3493 3494 3495 3496 3497 3498 3499 3500 3501
int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set)
{
	if (!ctrl->ops->reinit_request)
		return 0;

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

3502 3503 3504 3505
int __init nvme_core_init(void)
{
	int result;

3506 3507 3508 3509 3510
	nvme_wq = alloc_workqueue("nvme-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_wq)
		return -ENOMEM;

3511
	result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
3512
	if (result < 0)
3513
		goto destroy_wq;
3514 3515 3516 3517 3518 3519 3520

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

C
Christoph Hellwig 已提交
3521 3522 3523 3524 3525
	nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
	if (IS_ERR(nvme_subsys_class)) {
		result = PTR_ERR(nvme_subsys_class);
		goto destroy_class;
	}
3526
	return 0;
3527

C
Christoph Hellwig 已提交
3528 3529
destroy_class:
	class_destroy(nvme_class);
3530
unregister_chrdev:
3531
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3532 3533
destroy_wq:
	destroy_workqueue(nvme_wq);
3534
	return result;
3535 3536 3537 3538
}

void nvme_core_exit(void)
{
C
Christoph Hellwig 已提交
3539 3540
	ida_destroy(&nvme_subsystems_ida);
	class_destroy(nvme_subsys_class);
3541
	class_destroy(nvme_class);
3542
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3543
	destroy_workqueue(nvme_wq);
3544
}
3545 3546 3547 3548 3549

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