core.c 90.0 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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#define CREATE_TRACE_POINTS
#include "trace.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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/*
 * nvme_wq - hosts nvme related works that are not reset or delete
 * nvme_reset_wq - hosts nvme reset works
 * nvme_delete_wq - hosts nvme delete works
 *
 * nvme_wq will host works such are scan, aen handling, fw activation,
 * keep-alive error recovery, periodic reconnects etc. nvme_reset_wq
 * runs reset works which also flush works hosted on nvme_wq for
 * serialization purposes. nvme_delete_wq host controller deletion
 * works which flush reset works for serialization.
 */
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struct workqueue_struct *nvme_wq;
EXPORT_SYMBOL_GPL(nvme_wq);

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struct workqueue_struct *nvme_reset_wq;
EXPORT_SYMBOL_GPL(nvme_reset_wq);

struct workqueue_struct *nvme_delete_wq;
EXPORT_SYMBOL_GPL(nvme_delete_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;
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	if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
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		return -EBUSY;
	return 0;
}
EXPORT_SYMBOL_GPL(nvme_reset_ctrl);

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

	ret = nvme_reset_ctrl(ctrl);
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	if (!ret) {
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		flush_work(&ctrl->reset_work);
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		if (ctrl->state != NVME_CTRL_LIVE)
			ret = -ENETRESET;
	}

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	return ret;
}
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EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
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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;
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	if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
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		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_LBA_RANGE:
		return BLK_STS_TARGET;
	case NVME_SC_BAD_ATTRIBUTES:
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	case NVME_SC_ONCS_NOT_SUPPORTED:
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	case NVME_SC_INVALID_OPCODE:
	case NVME_SC_INVALID_FIELD:
	case NVME_SC_INVALID_NS:
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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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	case NVME_SC_COMPARE_FAILED:
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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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	blk_status_t status = nvme_error_status(req);

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	trace_nvme_complete_rq(req);

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	if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
		if (nvme_req_needs_failover(req, status)) {
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			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, status);
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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) {
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		case NVME_CTRL_CONNECTING:
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			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_CONNECTING:
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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;
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	case NVME_CTRL_CONNECTING:
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		switch (old_state) {
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		case NVME_CTRL_NEW:
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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_CONNECTING:
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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;

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		if (n < segments) {
			range[n].cattr = cpu_to_le32(0);
			range[n].nlb = cpu_to_le32(nlb);
			range[n].slba = cpu_to_le64(slba);
		}
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		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);
605
	return 0;
M
Ming Lin 已提交
606 607
}

608
blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
M
Ming Lin 已提交
609 610
		struct nvme_command *cmd)
{
611
	blk_status_t ret = BLK_STS_OK;
M
Ming Lin 已提交
612

613
	if (!(req->rq_flags & RQF_DONTPREP)) {
614
		nvme_req(req)->retries = 0;
615
		nvme_req(req)->flags = 0;
616 617 618
		req->rq_flags |= RQF_DONTPREP;
	}

619 620 621
	switch (req_op(req)) {
	case REQ_OP_DRV_IN:
	case REQ_OP_DRV_OUT:
622
		memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
623 624
		break;
	case REQ_OP_FLUSH:
M
Ming Lin 已提交
625
		nvme_setup_flush(ns, cmd);
626
		break;
627 628
	case REQ_OP_WRITE_ZEROES:
		/* currently only aliased to deallocate for a few ctrls: */
629
	case REQ_OP_DISCARD:
M
Ming Lin 已提交
630
		ret = nvme_setup_discard(ns, req, cmd);
631 632 633
		break;
	case REQ_OP_READ:
	case REQ_OP_WRITE:
634
		ret = nvme_setup_rw(ns, req, cmd);
635 636 637
		break;
	default:
		WARN_ON_ONCE(1);
638
		return BLK_STS_IOERR;
639
	}
M
Ming Lin 已提交
640

641
	cmd->common.command_id = req->tag;
642 643 644 645
	if (ns)
		trace_nvme_setup_nvm_cmd(req->q->id, cmd);
	else
		trace_nvme_setup_admin_cmd(cmd);
M
Ming Lin 已提交
646 647 648 649
	return ret;
}
EXPORT_SYMBOL_GPL(nvme_setup_cmd);

650 651 652 653 654
/*
 * 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,
655
		union nvme_result *result, void *buffer, unsigned bufflen,
656 657
		unsigned timeout, int qid, int at_head,
		blk_mq_req_flags_t flags)
658 659 660 661
{
	struct request *req;
	int ret;

662
	req = nvme_alloc_request(q, cmd, flags, qid);
663 664 665 666 667
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

668 669 670 671
	if (buffer && bufflen) {
		ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
		if (ret)
			goto out;
672 673
	}

674
	blk_execute_rq(req->q, NULL, req, at_head);
675 676
	if (result)
		*result = nvme_req(req)->result;
677 678 679 680
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
681 682 683 684
 out:
	blk_mq_free_request(req);
	return ret;
}
685
EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
686 687 688 689

int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
		void *buffer, unsigned bufflen)
{
690 691
	return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
			NVME_QID_ANY, 0, 0);
692
}
693
EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
694

695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
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);
}

729
static int nvme_submit_user_cmd(struct request_queue *q,
730 731 732
		struct nvme_command *cmd, void __user *ubuffer,
		unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
		u32 meta_seed, u32 *result, unsigned timeout)
733
{
734
	bool write = nvme_is_write(cmd);
735 736
	struct nvme_ns *ns = q->queuedata;
	struct gendisk *disk = ns ? ns->disk : NULL;
737
	struct request *req;
738 739
	struct bio *bio = NULL;
	void *meta = NULL;
740 741
	int ret;

742
	req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
743 744 745 746 747 748
	if (IS_ERR(req))
		return PTR_ERR(req);

	req->timeout = timeout ? timeout : ADMIN_TIMEOUT;

	if (ubuffer && bufflen) {
749 750 751 752 753
		ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
				GFP_KERNEL);
		if (ret)
			goto out;
		bio = req->bio;
754
		bio->bi_disk = disk;
755 756 757 758 759
		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);
760 761 762 763
				goto out_unmap;
			}
		}
	}
764

765
	blk_execute_rq(req->q, disk, req, 0);
766 767 768 769
	if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
		ret = -EINTR;
	else
		ret = nvme_req(req)->status;
770
	if (result)
771
		*result = le32_to_cpu(nvme_req(req)->result.u32);
772 773 774 775 776 777
	if (meta && !ret && !write) {
		if (copy_to_user(meta_buffer, meta, meta_len))
			ret = -EFAULT;
	}
	kfree(meta);
 out_unmap:
778
	if (bio)
779
		blk_rq_unmap_user(bio);
780 781 782 783 784
 out:
	blk_mq_free_request(req);
	return ret;
}

785
static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
S
Sagi Grimberg 已提交
786 787 788 789 790
{
	struct nvme_ctrl *ctrl = rq->end_io_data;

	blk_mq_free_request(rq);

791
	if (status) {
S
Sagi Grimberg 已提交
792
		dev_err(ctrl->device,
793 794
			"failed nvme_keep_alive_end_io error=%d\n",
				status);
S
Sagi Grimberg 已提交
795 796 797 798 799 800 801 802 803 804
		return;
	}

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

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

805
	rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
S
Sagi Grimberg 已提交
806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825
			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");
826
		nvme_reset_ctrl(ctrl);
S
Sagi Grimberg 已提交
827 828 829 830 831 832 833 834 835 836
		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);
837 838
	memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
	ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
S
Sagi Grimberg 已提交
839 840 841 842 843 844 845 846 847 848 849 850 851
	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
852
static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
853 854 855 856 857 858
{
	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;
859
	c.identify.cns = NVME_ID_CNS_CTRL;
860 861 862 863 864 865 866 867 868 869 870 871

	*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;
}

872
static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
873
		struct nvme_ns_ids *ids)
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888
{
	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;

889
	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
890 891 892 893 894 895 896 897 898 899 900 901 902
				      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) {
903
				dev_warn(ctrl->device,
904 905 906 907 908
					 "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_EUI64_LEN;
909
			memcpy(ids->eui64, data + pos + sizeof(*cur), len);
910 911 912
			break;
		case NVME_NIDT_NGUID:
			if (cur->nidl != NVME_NIDT_NGUID_LEN) {
913
				dev_warn(ctrl->device,
914 915 916 917 918
					 "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_NGUID_LEN;
919
			memcpy(ids->nguid, data + pos + sizeof(*cur), len);
920 921 922
			break;
		case NVME_NIDT_UUID:
			if (cur->nidl != NVME_NIDT_UUID_LEN) {
923
				dev_warn(ctrl->device,
924 925 926 927 928
					 "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
					 cur->nidl);
				goto free_data;
			}
			len = NVME_NIDT_UUID_LEN;
929
			uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
930 931 932 933 934 935 936 937 938 939 940 941 942 943
			break;
		default:
			/* Skip unnkown types */
			len = cur->nidl;
			break;
		}

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

944 945 946 947 948
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;
949
	c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
950 951 952 953
	c.identify.nsid = cpu_to_le32(nsid);
	return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
}

954 955
static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
		unsigned nsid)
956
{
957
	struct nvme_id_ns *id;
958 959 960 961
	struct nvme_command c = { };
	int error;

	/* gcc-4.4.4 (at least) has issues with initializers and anon unions */
962 963
	c.identify.opcode = nvme_admin_identify;
	c.identify.nsid = cpu_to_le32(nsid);
964
	c.identify.cns = NVME_ID_CNS_NS;
965

966 967 968
	id = kmalloc(sizeof(*id), GFP_KERNEL);
	if (!id)
		return NULL;
969

970 971 972 973 974 975 976 977
	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;
978 979
}

K
Keith Busch 已提交
980
static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
981
		      void *buffer, size_t buflen, u32 *result)
982 983
{
	struct nvme_command c;
984
	union nvme_result res;
985
	int ret;
986 987 988 989 990 991

	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);

992
	ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
993
			buffer, buflen, 0, NVME_QID_ANY, 0, 0);
994
	if (ret >= 0 && result)
995
		*result = le32_to_cpu(res.u32);
996
	return ret;
997 998
}

C
Christoph Hellwig 已提交
999 1000 1001 1002 1003 1004
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;

1005
	status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
C
Christoph Hellwig 已提交
1006
			&result);
1007
	if (status < 0)
C
Christoph Hellwig 已提交
1008 1009
		return status;

1010 1011 1012 1013 1014 1015
	/*
	 * 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) {
1016
		dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
1017 1018 1019 1020 1021 1022
		*count = 0;
	} else {
		nr_io_queues = min(result & 0xffff, result >> 16) + 1;
		*count = min(*count, nr_io_queues);
	}

C
Christoph Hellwig 已提交
1023 1024
	return 0;
}
1025
EXPORT_SYMBOL_GPL(nvme_set_queue_count);
C
Christoph Hellwig 已提交
1026

1027 1028 1029 1030 1031 1032 1033 1034 1035
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;
1036 1037
	if (io.flags)
		return -EINVAL;
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

	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
1063
	c.rw.nsid = cpu_to_le32(ns->head->ns_id);
1064 1065 1066 1067 1068 1069 1070 1071
	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);

1072
	return nvme_submit_user_cmd(ns->queue, &c,
1073 1074 1075 1076
			(void __user *)(uintptr_t)io.addr, length,
			metadata, meta_len, io.slba, NULL, 0);
}

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 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
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)
{
1124 1125
	struct nvme_ns *ns, *next;
	LIST_HEAD(rm_list);
1126 1127 1128

	mutex_lock(&ctrl->namespaces_mutex);
	list_for_each_entry(ns, &ctrl->namespaces, list) {
1129 1130 1131
		if (ns->disk && nvme_revalidate_disk(ns->disk)) {
			list_move_tail(&ns->list, &rm_list);
		}
1132 1133
	}
	mutex_unlock(&ctrl->namespaces_mutex);
1134 1135 1136

	list_for_each_entry_safe(ns, next, &rm_list, list)
		nvme_ns_remove(ns);
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155
}

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);
}

1156
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
1157 1158 1159 1160 1161
			struct nvme_passthru_cmd __user *ucmd)
{
	struct nvme_passthru_cmd cmd;
	struct nvme_command c;
	unsigned timeout = 0;
1162
	u32 effects;
1163 1164 1165 1166 1167 1168
	int status;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
		return -EFAULT;
1169 1170
	if (cmd.flags)
		return -EINVAL;
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187

	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);

1188
	effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
1189
	status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
1190
			(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
1191 1192
			(void __user *)(uintptr_t)cmd.metadata, cmd.metadata,
			0, &cmd.result, timeout);
1193 1194
	nvme_passthru_end(ctrl, effects);

1195 1196 1197 1198 1199 1200 1201 1202
	if (status >= 0) {
		if (put_user(cmd.result, &ucmd->result))
			return -EFAULT;
	}

	return status;
}

1203 1204 1205 1206 1207 1208
/*
 * 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)
1209
{
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
#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;
}
1221

1222 1223 1224 1225 1226
static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
{
	if (head)
		srcu_read_unlock(&head->srcu, idx);
}
1227

1228 1229
static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned cmd, unsigned long arg)
{
1230 1231 1232
	switch (cmd) {
	case NVME_IOCTL_ID:
		force_successful_syscall_return();
C
Christoph Hellwig 已提交
1233
		return ns->head->ns_id;
1234 1235 1236 1237 1238 1239 1240
	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:
1241 1242 1243 1244
#ifdef CONFIG_NVM
		if (ns->ndev)
			return nvme_nvm_ioctl(ns, cmd, arg);
#endif
1245
		if (is_sed_ioctl(cmd))
1246
			return sed_ioctl(ns->ctrl->opal_dev, cmd,
1247
					 (void __user *) arg);
1248 1249 1250 1251
		return -ENOTTY;
	}
}

1252 1253
static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
		unsigned int cmd, unsigned long arg)
1254
{
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
	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;
1266 1267 1268 1269
}

static int nvme_open(struct block_device *bdev, fmode_t mode)
{
C
Christoph Hellwig 已提交
1270 1271
	struct nvme_ns *ns = bdev->bd_disk->private_data;

1272 1273 1274
#ifdef CONFIG_NVME_MULTIPATH
	/* should never be called due to GENHD_FL_HIDDEN */
	if (WARN_ON_ONCE(ns->head->disk))
1275
		goto fail;
1276
#endif
C
Christoph Hellwig 已提交
1277
	if (!kref_get_unless_zero(&ns->kref))
1278 1279 1280 1281
		goto fail;
	if (!try_module_get(ns->ctrl->ops->module))
		goto fail_put_ns;

C
Christoph Hellwig 已提交
1282
	return 0;
1283 1284 1285 1286 1287

fail_put_ns:
	nvme_put_ns(ns);
fail:
	return -ENXIO;
1288 1289 1290 1291
}

static void nvme_release(struct gendisk *disk, fmode_t mode)
{
1292 1293 1294 1295
	struct nvme_ns *ns = disk->private_data;

	module_put(ns->ctrl->ops->module);
	nvme_put_ns(ns);
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307
}

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
1308
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1309 1310 1311
{
	struct blk_integrity integrity;

1312
	memset(&integrity, 0, sizeof(integrity));
1313
	switch (pi_type) {
1314 1315
	case NVME_NS_DPS_PI_TYPE3:
		integrity.profile = &t10_pi_type3_crc;
1316 1317
		integrity.tag_size = sizeof(u16) + sizeof(u32);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1318 1319 1320 1321
		break;
	case NVME_NS_DPS_PI_TYPE1:
	case NVME_NS_DPS_PI_TYPE2:
		integrity.profile = &t10_pi_type1_crc;
1322 1323
		integrity.tag_size = sizeof(u16);
		integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
1324 1325 1326 1327 1328
		break;
	default:
		integrity.profile = NULL;
		break;
	}
1329 1330 1331
	integrity.tuple_size = ms;
	blk_integrity_register(disk, &integrity);
	blk_queue_max_integrity_segments(disk->queue, 1);
1332 1333
}
#else
1334
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
1335 1336 1337 1338
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */

1339 1340 1341 1342 1343 1344
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));
}

1345 1346
static void nvme_config_discard(struct nvme_ctrl *ctrl,
		unsigned stream_alignment, struct request_queue *queue)
1347
{
1348 1349 1350 1351
	u32 size = queue_logical_block_size(queue);

	if (stream_alignment)
		size *= stream_alignment;
1352

1353 1354 1355
	BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
			NVME_DSM_MAX_RANGES);

1356
	queue->limits.discard_alignment = 0;
1357
	queue->limits.discard_granularity = size;
1358

1359 1360 1361
	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);
1362 1363

	if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
1364
		blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
1365 1366
}

1367
static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
1368
		struct nvme_id_ns *id, struct nvme_ns_ids *ids)
1369
{
1370 1371
	memset(ids, 0, sizeof(*ids));

1372
	if (ctrl->vs >= NVME_VS(1, 1, 0))
1373
		memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
1374
	if (ctrl->vs >= NVME_VS(1, 2, 0))
1375
		memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
1376
	if (ctrl->vs >= NVME_VS(1, 3, 0)) {
1377 1378 1379
		 /* Don't treat error as fatal we potentially
		  * already have a NGUID or EUI-64
		  */
1380
		if (nvme_identify_ns_descs(ctrl, nsid, ids))
1381
			dev_warn(ctrl->device,
1382 1383
				 "%s: Identify Descriptors failed\n", __func__);
	}
1384 1385
}

C
Christoph Hellwig 已提交
1386 1387 1388 1389 1390 1391 1392
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));
}

1393 1394 1395 1396 1397 1398 1399
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;
}

1400 1401 1402 1403
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);
1404
	unsigned short bs = 1 << ns->lba_shift;
1405 1406 1407 1408 1409 1410 1411 1412
	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);

1413 1414 1415 1416
	blk_queue_logical_block_size(disk->queue, bs);
	blk_queue_physical_block_size(disk->queue, bs);
	blk_queue_io_min(disk->queue, bs);

1417 1418 1419
	if (ns->ms && !ns->ext &&
	    (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
		nvme_init_integrity(disk, ns->ms, ns->pi_type);
1420
	if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk))
1421 1422 1423 1424 1425 1426 1427 1428
		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);
}

1429 1430 1431
static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
{
	struct nvme_ns *ns = disk->private_data;
1432 1433 1434 1435 1436

	/*
	 * If identify namespace failed, use default 512 byte block size so
	 * block layer can use before failing read/write for 0 capacity.
	 */
1437
	ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
1438 1439
	if (ns->lba_shift == 0)
		ns->lba_shift = 9;
1440
	ns->noiob = le16_to_cpu(id->noiob);
1441 1442 1443 1444 1445 1446 1447
	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;
1448

1449 1450
	if (ns->noiob)
		nvme_set_chunk_size(ns);
1451
	nvme_update_disk_info(disk, ns, id);
1452 1453 1454 1455
#ifdef CONFIG_NVME_MULTIPATH
	if (ns->head->disk)
		nvme_update_disk_info(ns->head->disk, ns, id);
#endif
1456
}
1457

1458 1459 1460
static int nvme_revalidate_disk(struct gendisk *disk)
{
	struct nvme_ns *ns = disk->private_data;
1461 1462
	struct nvme_ctrl *ctrl = ns->ctrl;
	struct nvme_id_ns *id;
1463
	struct nvme_ns_ids ids;
1464
	int ret = 0;
1465 1466 1467 1468 1469 1470

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

C
Christoph Hellwig 已提交
1471
	id = nvme_identify_ns(ctrl, ns->head->ns_id);
1472 1473
	if (!id)
		return -ENODEV;
1474

1475 1476 1477 1478
	if (id->ncap == 0) {
		ret = -ENODEV;
		goto out;
	}
1479

1480
	__nvme_revalidate_disk(disk, id);
C
Christoph Hellwig 已提交
1481 1482
	nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
	if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
1483
		dev_err(ctrl->device,
C
Christoph Hellwig 已提交
1484
			"identifiers changed for nsid %d\n", ns->head->ns_id);
1485 1486 1487
		ret = -ENODEV;
	}

1488 1489 1490
out:
	kfree(id);
	return ret;
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
}

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)
{
1516 1517
	struct nvme_ns_head *head = NULL;
	struct nvme_ns *ns;
1518
	struct nvme_command c;
1519
	int srcu_idx, ret;
1520 1521
	u8 data[16] = { 0, };

1522 1523 1524 1525
	ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
	if (unlikely(!ns))
		return -EWOULDBLOCK;

1526 1527 1528 1529 1530
	put_unaligned_le64(key, &data[0]);
	put_unaligned_le64(sa_key, &data[8]);

	memset(&c, 0, sizeof(c));
	c.common.opcode = op;
1531
	c.common.nsid = cpu_to_le32(ns->head->ns_id);
1532 1533
	c.common.cdw10[0] = cpu_to_le32(cdw10);

1534
	ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
1535 1536
	nvme_put_ns_from_disk(head, srcu_idx);
	return ret;
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
}

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)
{
1575
	u32 cdw10 = 1 | (key ? 1 << 3 : 0);
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
	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,
};

1593
#ifdef CONFIG_BLK_SED_OPAL
1594 1595
int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
		bool send)
1596
{
1597
	struct nvme_ctrl *ctrl = data;
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
	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 */

1615
static const struct block_device_operations nvme_fops = {
1616 1617
	.owner		= THIS_MODULE,
	.ioctl		= nvme_ioctl,
1618
	.compat_ioctl	= nvme_ioctl,
1619 1620 1621 1622 1623 1624 1625
	.open		= nvme_open,
	.release	= nvme_release,
	.getgeo		= nvme_getgeo,
	.revalidate_disk= nvme_revalidate_disk,
	.pr_ops		= &nvme_pr_ops,
};

1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
#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 */

1652 1653 1654 1655 1656 1657 1658 1659
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
1660 1661
		if (csts == ~0)
			return -ENODEV;
1662 1663 1664 1665 1666 1667 1668
		if ((csts & NVME_CSTS_RDY) == bit)
			break;

		msleep(100);
		if (fatal_signal_pending(current))
			return -EINTR;
		if (time_after(jiffies, timeout)) {
1669
			dev_err(ctrl->device,
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
				"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;
1695

1696
	if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
1697 1698
		msleep(NVME_QUIRK_DELAY_AMOUNT);

1699 1700
	return nvme_wait_ready(ctrl, cap, false);
}
1701
EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713

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) {
1714
		dev_err(ctrl->device,
1715 1716 1717 1718 1719 1720 1721 1722 1723
			"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;
1724
	ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
1725 1726 1727 1728 1729 1730 1731 1732
	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);
}
1733
EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
1734 1735 1736

int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
{
1737
	unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
	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)) {
1756
			dev_err(ctrl->device,
1757 1758 1759 1760 1761 1762 1763
				"Device shutdown incomplete; abort shutdown\n");
			return -ENODEV;
		}
	}

	return ret;
}
1764
EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
1765

1766 1767 1768
static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
		struct request_queue *q)
{
1769 1770
	bool vwc = false;

1771
	if (ctrl->max_hw_sectors) {
1772 1773 1774
		u32 max_segments =
			(ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;

1775
		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
1776
		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
1777
	}
1778 1779
	if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
	    is_power_of_2(ctrl->max_hw_sectors))
K
Keith Busch 已提交
1780
		blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
1781
	blk_queue_virt_boundary(q, ctrl->page_size - 1);
1782 1783 1784
	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
		vwc = true;
	blk_queue_write_cache(q, vwc, vwc);
1785 1786
}

1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
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;
}

1804
static int nvme_configure_apst(struct nvme_ctrl *ctrl)
1805 1806 1807 1808 1809 1810 1811 1812
{
	/*
	 * 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
1813
	 * non-operational state after waiting 50 * (enlat + exlat)
1814
	 * microseconds, as long as that state's exit latency is under
1815 1816 1817 1818 1819 1820 1821 1822 1823
	 * 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;
1824 1825
	u64 max_lat_us = 0;
	int max_ps = -1;
1826 1827 1828 1829 1830 1831 1832
	int ret;

	/*
	 * If APST isn't supported or if we haven't been initialized yet,
	 * then don't do anything.
	 */
	if (!ctrl->apsta)
1833
		return 0;
1834 1835 1836

	if (ctrl->npss > 31) {
		dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
1837
		return 0;
1838 1839 1840 1841
	}

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
1842
		return 0;
1843

1844
	if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
1845 1846
		/* Turn off APST. */
		apste = 0;
1847
		dev_dbg(ctrl->device, "APST disabled\n");
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
	} 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--) {
1859
			u64 total_latency_us, exit_latency_us, transition_ms;
1860 1861 1862 1863

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

1864 1865 1866 1867 1868 1869 1870 1871
			/*
			 * 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;

1872 1873 1874 1875 1876 1877 1878 1879
			/*
			 * 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;

1880 1881 1882
			exit_latency_us =
				(u64)le32_to_cpu(ctrl->psd[state].exit_lat);
			if (exit_latency_us > ctrl->ps_max_latency_us)
1883 1884
				continue;

1885 1886 1887 1888
			total_latency_us =
				exit_latency_us +
				le32_to_cpu(ctrl->psd[state].entry_lat);

1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
			/*
			 * 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));
1900 1901 1902 1903 1904 1905

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

			if (total_latency_us > max_lat_us)
				max_lat_us = total_latency_us;
1906 1907 1908
		}

		apste = 1;
1909 1910 1911 1912 1913 1914 1915

		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);
		}
1916 1917 1918 1919 1920 1921 1922 1923
	}

	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);
1924
	return ret;
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
}

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);
	}
}

1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
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[] = {
1961
	{
1962 1963 1964 1965 1966 1967
		/*
		 * 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",
1968
		.quirks = NVME_QUIRK_NO_APST,
1969
	}
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
};

/* 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
2001 2002
static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
		struct nvme_id_ctrl *id)
2003 2004 2005 2006 2007 2008
{
	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
2009
		strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2010 2011 2012 2013 2014 2015 2016
		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
2017
	off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2018 2019
			"nqn.2014.08.org.nvmexpress:%4x%4x",
			le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
C
Christoph Hellwig 已提交
2020
	memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2021
	off += sizeof(id->sn);
C
Christoph Hellwig 已提交
2022
	memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2023
	off += sizeof(id->mn);
C
Christoph Hellwig 已提交
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046
	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
2047
	ida_destroy(&subsys->ns_ida);
C
Christoph Hellwig 已提交
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073
	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;
}

2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
#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,
};

2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
static int nvme_active_ctrls(struct nvme_subsystem *subsys)
{
	int count = 0;
	struct nvme_ctrl *ctrl;

	mutex_lock(&subsys->lock);
	list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
		if (ctrl->state != NVME_CTRL_DELETING &&
		    ctrl->state != NVME_CTRL_DEAD)
			count++;
	}
	mutex_unlock(&subsys->lock);

	return count;
}

C
Christoph Hellwig 已提交
2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153
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
2154
	INIT_LIST_HEAD(&subsys->nsheads);
C
Christoph Hellwig 已提交
2155 2156 2157 2158 2159 2160 2161 2162 2163
	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;
2164
	subsys->dev.groups = nvme_subsys_attrs_groups;
C
Christoph Hellwig 已提交
2165 2166 2167 2168 2169 2170 2171 2172 2173 2174
	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.
		 */
2175
		if (nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) {
C
Christoph Hellwig 已提交
2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192
			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
2193
		ida_init(&subsys->ns_ida);
C
Christoph Hellwig 已提交
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
		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;
2218 2219
}

K
Keith Busch 已提交
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231
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);
}

2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248
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;
2249 2250
}

2251 2252 2253 2254 2255 2256 2257 2258 2259 2260
/*
 * 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;
2261
	u32 max_hw_sectors;
2262
	bool prev_apst_enabled;
2263

2264 2265
	ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
	if (ret) {
2266
		dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
2267 2268 2269
		return ret;
	}

2270 2271
	ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
	if (ret) {
2272
		dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
2273 2274 2275 2276
		return ret;
	}
	page_shift = NVME_CAP_MPSMIN(cap) + 12;

2277
	if (ctrl->vs >= NVME_VS(1, 1, 0))
2278 2279
		ctrl->subsystem = NVME_CAP_NSSRC(cap);

2280 2281
	ret = nvme_identify_ctrl(ctrl, &id);
	if (ret) {
2282
		dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
2283 2284 2285
		return -EIO;
	}

2286 2287 2288 2289 2290
	if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) {
		ret = nvme_get_effects_log(ctrl);
		if (ret < 0)
			return ret;
	}
2291

2292
	if (!ctrl->identified) {
C
Christoph Hellwig 已提交
2293 2294 2295 2296 2297 2298
		int i;

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

2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312
		/*
		 * 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;
		}
	}

2313
	if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
2314
		dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
2315 2316 2317
		ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
	}

2318
	ctrl->oacs = le16_to_cpu(id->oacs);
2319
	ctrl->oncs = le16_to_cpup(&id->oncs);
2320
	atomic_set(&ctrl->abort_limit, id->acl + 1);
2321
	ctrl->vwc = id->vwc;
M
Ming Lin 已提交
2322
	ctrl->cntlid = le16_to_cpup(&id->cntlid);
2323
	if (id->mdts)
2324
		max_hw_sectors = 1 << (id->mdts + page_shift - 9);
2325
	else
2326 2327 2328
		max_hw_sectors = UINT_MAX;
	ctrl->max_hw_sectors =
		min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
2329

2330
	nvme_set_queue_limits(ctrl, ctrl->admin_q);
2331
	ctrl->sgls = le32_to_cpu(id->sgls);
S
Sagi Grimberg 已提交
2332
	ctrl->kas = le16_to_cpu(id->kas);
2333

2334 2335 2336 2337 2338 2339 2340 2341
	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)
2342
			dev_info(ctrl->device,
2343 2344 2345 2346 2347
				 "Shutdown timeout set to %u seconds\n",
				 ctrl->shutdown_timeout);
	} else
		ctrl->shutdown_timeout = shutdown_timeout;

2348
	ctrl->npss = id->npss;
2349 2350
	ctrl->apsta = id->apsta;
	prev_apst_enabled = ctrl->apst_enabled;
2351 2352
	if (ctrl->quirks & NVME_QUIRK_NO_APST) {
		if (force_apst && id->apsta) {
2353
			dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
2354
			ctrl->apst_enabled = true;
2355
		} else {
2356
			ctrl->apst_enabled = false;
2357 2358
		}
	} else {
2359
		ctrl->apst_enabled = id->apsta;
2360
	}
2361 2362
	memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));

2363
	if (ctrl->ops->flags & NVME_F_FABRICS) {
2364 2365 2366 2367 2368 2369 2370 2371 2372
		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
		 */
2373
		if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
2374
			ret = -EINVAL;
2375 2376
			goto out_free;
		}
S
Sagi Grimberg 已提交
2377 2378

		if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
2379
			dev_err(ctrl->device,
S
Sagi Grimberg 已提交
2380 2381
				"keep-alive support is mandatory for fabrics\n");
			ret = -EINVAL;
2382
			goto out_free;
S
Sagi Grimberg 已提交
2383
		}
2384 2385
	} else {
		ctrl->cntlid = le16_to_cpu(id->cntlid);
2386 2387
		ctrl->hmpre = le32_to_cpu(id->hmpre);
		ctrl->hmmin = le32_to_cpu(id->hmmin);
2388 2389
		ctrl->hmminds = le32_to_cpu(id->hmminds);
		ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
2390
	}
2391

2392
	kfree(id);
2393

2394
	if (ctrl->apst_enabled && !prev_apst_enabled)
2395
		dev_pm_qos_expose_latency_tolerance(ctrl->device);
2396
	else if (!ctrl->apst_enabled && prev_apst_enabled)
2397 2398
		dev_pm_qos_hide_latency_tolerance(ctrl->device);

2399 2400 2401
	ret = nvme_configure_apst(ctrl);
	if (ret < 0)
		return ret;
2402 2403 2404 2405
	
	ret = nvme_configure_timestamp(ctrl);
	if (ret < 0)
		return ret;
2406 2407 2408 2409

	ret = nvme_configure_directives(ctrl);
	if (ret < 0)
		return ret;
2410

2411
	ctrl->identified = true;
2412

2413 2414 2415 2416
	return 0;

out_free:
	kfree(id);
2417
	return ret;
2418
}
2419
EXPORT_SYMBOL_GPL(nvme_init_identify);
2420

2421
static int nvme_dev_open(struct inode *inode, struct file *file)
2422
{
2423 2424
	struct nvme_ctrl *ctrl =
		container_of(inode->i_cdev, struct nvme_ctrl, cdev);
2425

2426 2427 2428 2429 2430
	switch (ctrl->state) {
	case NVME_CTRL_LIVE:
	case NVME_CTRL_ADMIN_ONLY:
		break;
	default:
2431
		return -EWOULDBLOCK;
2432 2433
	}

2434
	file->private_data = ctrl;
2435 2436 2437
	return 0;
}

2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
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)) {
2451
		dev_warn(ctrl->device,
2452 2453 2454 2455 2456
			"NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
		ret = -EINVAL;
		goto out_unlock;
	}

2457
	dev_warn(ctrl->device,
2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470
		"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;
}

2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
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:
2481
		return nvme_dev_user_cmd(ctrl, argp);
2482
	case NVME_IOCTL_RESET:
2483
		dev_warn(ctrl->device, "resetting controller\n");
2484
		return nvme_reset_ctrl_sync(ctrl);
2485 2486
	case NVME_IOCTL_SUBSYS_RESET:
		return nvme_reset_subsystem(ctrl);
K
Keith Busch 已提交
2487 2488 2489
	case NVME_IOCTL_RESCAN:
		nvme_queue_scan(ctrl);
		return 0;
2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508
	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;

2509
	ret = nvme_reset_ctrl_sync(ctrl);
2510 2511 2512
	if (ret < 0)
		return ret;
	return count;
2513
}
2514
static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
2515

K
Keith Busch 已提交
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526
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);

2527 2528 2529 2530 2531 2532 2533 2534 2535 2536
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;
}

2537
static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
2538
		char *buf)
2539
{
2540 2541 2542
	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
2543 2544
	int serial_len = sizeof(subsys->serial);
	int model_len = sizeof(subsys->model);
2545

2546 2547
	if (!uuid_is_null(&ids->uuid))
		return sprintf(buf, "uuid.%pU\n", &ids->uuid);
2548

2549 2550
	if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
		return sprintf(buf, "eui.%16phN\n", ids->nguid);
2551

2552 2553
	if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
		return sprintf(buf, "eui.%8phN\n", ids->eui64);
2554

C
Christoph Hellwig 已提交
2555 2556
	while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' ||
				  subsys->serial[serial_len - 1] == '\0'))
2557
		serial_len--;
C
Christoph Hellwig 已提交
2558 2559
	while (model_len > 0 && (subsys->model[model_len - 1] == ' ' ||
				 subsys->model[model_len - 1] == '\0'))
2560 2561
		model_len--;

C
Christoph Hellwig 已提交
2562 2563
	return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id,
		serial_len, subsys->serial, model_len, subsys->model,
2564
		head->ns_id);
2565
}
J
Joe Perches 已提交
2566
static DEVICE_ATTR_RO(wwid);
2567

2568
static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
2569
		char *buf)
2570
{
2571
	return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid);
2572
}
J
Joe Perches 已提交
2573
static DEVICE_ATTR_RO(nguid);
2574

2575
static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
2576
		char *buf)
2577
{
2578
	struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2579 2580 2581 2582

	/* For backward compatibility expose the NGUID to userspace if
	 * we have no UUID set
	 */
2583
	if (uuid_is_null(&ids->uuid)) {
2584 2585
		printk_ratelimited(KERN_WARNING
				   "No UUID available providing old NGUID\n");
2586
		return sprintf(buf, "%pU\n", ids->nguid);
2587
	}
2588
	return sprintf(buf, "%pU\n", &ids->uuid);
2589
}
J
Joe Perches 已提交
2590
static DEVICE_ATTR_RO(uuid);
2591 2592

static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
2593
		char *buf)
2594
{
2595
	return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64);
2596
}
J
Joe Perches 已提交
2597
static DEVICE_ATTR_RO(eui);
2598 2599

static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
2600
		char *buf)
2601
{
2602
	return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id);
2603
}
J
Joe Perches 已提交
2604
static DEVICE_ATTR_RO(nsid);
2605

2606
static struct attribute *nvme_ns_id_attrs[] = {
2607
	&dev_attr_wwid.attr,
2608
	&dev_attr_uuid.attr,
2609
	&dev_attr_nguid.attr,
2610 2611 2612 2613 2614
	&dev_attr_eui.attr,
	&dev_attr_nsid.attr,
	NULL,
};

2615
static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj,
2616 2617 2618
		struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
2619
	struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids;
2620 2621

	if (a == &dev_attr_uuid.attr) {
2622
		if (uuid_is_null(&ids->uuid) &&
2623
		    !memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2624 2625 2626
			return 0;
	}
	if (a == &dev_attr_nguid.attr) {
2627
		if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid)))
2628 2629 2630
			return 0;
	}
	if (a == &dev_attr_eui.attr) {
2631
		if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64)))
2632 2633 2634 2635 2636
			return 0;
	}
	return a->mode;
}

2637 2638 2639
const struct attribute_group nvme_ns_id_attr_group = {
	.attrs		= nvme_ns_id_attrs,
	.is_visible	= nvme_ns_id_attrs_are_visible,
2640 2641
};

M
Ming Lin 已提交
2642
#define nvme_show_str_function(field)						\
2643 2644 2645 2646
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
2647 2648
        return sprintf(buf, "%.*s\n",						\
		(int)sizeof(ctrl->subsys->field), ctrl->subsys->field);		\
2649 2650 2651
}										\
static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);

C
Christoph Hellwig 已提交
2652 2653 2654 2655
nvme_show_str_function(model);
nvme_show_str_function(serial);
nvme_show_str_function(firmware_rev);

M
Ming Lin 已提交
2656 2657 2658 2659 2660 2661 2662 2663 2664 2665
#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);
2666

M
Ming Lin 已提交
2667 2668 2669 2670 2671 2672 2673
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))
2674
		nvme_delete_ctrl_sync(ctrl);
M
Ming Lin 已提交
2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688
	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);

2689 2690 2691 2692 2693 2694 2695 2696
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",
2697
		[NVME_CTRL_ADMIN_ONLY]	= "only-admin",
2698
		[NVME_CTRL_RESETTING]	= "resetting",
2699
		[NVME_CTRL_CONNECTING]	= "connecting",
2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712
		[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
2713 2714 2715 2716 2717 2718
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
2719
	return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn);
M
Ming Lin 已提交
2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732
}
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);

2733 2734
static struct attribute *nvme_dev_attrs[] = {
	&dev_attr_reset_controller.attr,
K
Keith Busch 已提交
2735
	&dev_attr_rescan_controller.attr,
2736 2737 2738
	&dev_attr_model.attr,
	&dev_attr_serial.attr,
	&dev_attr_firmware_rev.attr,
M
Ming Lin 已提交
2739
	&dev_attr_cntlid.attr,
M
Ming Lin 已提交
2740 2741 2742 2743
	&dev_attr_delete_controller.attr,
	&dev_attr_transport.attr,
	&dev_attr_subsysnqn.attr,
	&dev_attr_address.attr,
2744
	&dev_attr_state.attr,
2745 2746 2747
	NULL
};

M
Ming Lin 已提交
2748 2749 2750 2751 2752 2753
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);

2754 2755 2756 2757
	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
2758 2759 2760 2761

	return a->mode;
}

2762
static struct attribute_group nvme_dev_attrs_group = {
M
Ming Lin 已提交
2763 2764
	.attrs		= nvme_dev_attrs,
	.is_visible	= nvme_dev_attrs_are_visible,
2765 2766 2767 2768 2769 2770 2771
};

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

C
Christoph Hellwig 已提交
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 2823 2824 2825 2826 2827 2828 2829 2830
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;
	}

2831 2832 2833 2834
	ret = nvme_mpath_alloc_disk(ctrl, head);
	if (ret)
		goto out_cleanup_srcu;

C
Christoph Hellwig 已提交
2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846
	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,
2847
		struct nvme_id_ns *id)
C
Christoph Hellwig 已提交
2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883
{
	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;
		}
	} 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;
		}
	}

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

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

2884 2885 2886 2887 2888
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
2889
	return nsa->head->ns_id - nsb->head->ns_id;
2890 2891
}

2892
static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
2893
{
2894
	struct nvme_ns *ns, *ret = NULL;
2895

2896
	mutex_lock(&ctrl->namespaces_mutex);
2897
	list_for_each_entry(ns, &ctrl->namespaces, list) {
C
Christoph Hellwig 已提交
2898
		if (ns->head->ns_id == nsid) {
2899 2900
			if (!kref_get_unless_zero(&ns->kref))
				continue;
2901 2902 2903
			ret = ns;
			break;
		}
C
Christoph Hellwig 已提交
2904
		if (ns->head->ns_id > nsid)
2905 2906
			break;
	}
2907 2908
	mutex_unlock(&ctrl->namespaces_mutex);
	return ret;
2909 2910
}

2911 2912 2913 2914 2915 2916 2917 2918
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
2919
	ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id);
2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936
	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;
}

2937 2938 2939 2940
static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;
	struct gendisk *disk;
2941 2942
	struct nvme_id_ns *id;
	char disk_name[DISK_NAME_LEN];
2943
	int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT;
2944 2945 2946 2947 2948 2949 2950

	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
2951
		goto out_free_ns;
2952 2953 2954 2955 2956 2957 2958 2959
	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);
2960
	nvme_set_queue_limits(ctrl, ns->queue);
2961

2962 2963
	id = nvme_identify_ns(ctrl, nsid);
	if (!id)
2964 2965
		goto out_free_queue;

2966 2967 2968
	if (id->ncap == 0)
		goto out_free_id;

2969
	if (nvme_init_ns_head(ns, nsid, id))
C
Christoph Hellwig 已提交
2970
		goto out_free_id;
2971
	nvme_setup_streams_ns(ctrl, ns);
C
Christoph Hellwig 已提交
2972
	
2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994
#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
2995
	sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
2996
#endif
2997

C
Christoph Hellwig 已提交
2998 2999 3000
	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
3001
			goto out_unlink_ns;
C
Christoph Hellwig 已提交
3002
		}
3003
	}
3004

3005 3006
	disk = alloc_disk_node(0, node);
	if (!disk)
C
Christoph Hellwig 已提交
3007
		goto out_unlink_ns;
3008

3009 3010 3011
	disk->fops = &nvme_fops;
	disk->private_data = ns;
	disk->queue = ns->queue;
3012
	disk->flags = flags;
3013 3014 3015 3016
	memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
	ns->disk = disk;

	__nvme_revalidate_disk(disk, id);
3017

3018 3019 3020 3021
	mutex_lock(&ctrl->namespaces_mutex);
	list_add_tail(&ns->list, &ctrl->namespaces);
	mutex_unlock(&ctrl->namespaces_mutex);

3022
	nvme_get_ctrl(ctrl);
3023 3024 3025

	kfree(id);

3026
	device_add_disk(ctrl->device, ns->disk);
3027
	if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
3028
					&nvme_ns_id_attr_group))
3029 3030
		pr_warn("%s: failed to create sysfs group for identification\n",
			ns->disk->disk_name);
3031 3032 3033
	if (ns->ndev && nvme_nvm_register_sysfs(ns))
		pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
			ns->disk->disk_name);
3034

3035
	nvme_mpath_add_disk(ns->head);
3036
	nvme_mpath_add_disk_links(ns);
3037
	return;
C
Christoph Hellwig 已提交
3038 3039 3040 3041
 out_unlink_ns:
	mutex_lock(&ctrl->subsys->lock);
	list_del_rcu(&ns->siblings);
	mutex_unlock(&ctrl->subsys->lock);
3042 3043
 out_free_id:
	kfree(id);
3044 3045 3046 3047 3048 3049 3050 3051
 out_free_queue:
	blk_cleanup_queue(ns->queue);
 out_free_ns:
	kfree(ns);
}

static void nvme_ns_remove(struct nvme_ns *ns)
{
3052 3053
	if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
		return;
3054

3055
	if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
3056
		nvme_mpath_remove_disk_links(ns);
3057
		sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
3058
					&nvme_ns_id_attr_group);
3059 3060
		if (ns->ndev)
			nvme_nvm_unregister_sysfs(ns);
3061 3062
		del_gendisk(ns->disk);
		blk_cleanup_queue(ns->queue);
3063 3064
		if (blk_get_integrity(ns->disk))
			blk_integrity_unregister(ns->disk);
3065
	}
3066

C
Christoph Hellwig 已提交
3067
	mutex_lock(&ns->ctrl->subsys->lock);
3068
	nvme_mpath_clear_current_path(ns);
3069
	list_del_rcu(&ns->siblings);
C
Christoph Hellwig 已提交
3070 3071
	mutex_unlock(&ns->ctrl->subsys->lock);

3072
	mutex_lock(&ns->ctrl->namespaces_mutex);
3073
	list_del_init(&ns->list);
3074 3075
	mutex_unlock(&ns->ctrl->namespaces_mutex);

3076
	synchronize_srcu(&ns->head->srcu);
3077
	nvme_mpath_check_last_path(ns);
3078 3079 3080
	nvme_put_ns(ns);
}

3081 3082 3083 3084
static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
{
	struct nvme_ns *ns;

3085
	ns = nvme_find_get_ns(ctrl, nsid);
3086
	if (ns) {
3087
		if (ns->disk && revalidate_disk(ns->disk))
3088
			nvme_ns_remove(ns);
3089
		nvme_put_ns(ns);
3090 3091 3092 3093
	} else
		nvme_alloc_ns(ctrl, nsid);
}

3094 3095 3096 3097 3098 3099
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
3100
		if (ns->head->ns_id > nsid)
3101 3102 3103 3104
			nvme_ns_remove(ns);
	}
}

3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118
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)
3119
			goto free;
3120 3121 3122 3123 3124 3125 3126 3127 3128

		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) {
3129 3130
				ns = nvme_find_get_ns(ctrl, prev);
				if (ns) {
3131
					nvme_ns_remove(ns);
3132 3133
					nvme_put_ns(ns);
				}
3134 3135 3136 3137 3138
			}
		}
		nn -= j;
	}
 out:
3139 3140
	nvme_remove_invalid_namespaces(ctrl, prev);
 free:
3141 3142 3143 3144
	kfree(ns_list);
	return ret;
}

3145
static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
3146 3147 3148
{
	unsigned i;

3149 3150 3151
	for (i = 1; i <= nn; i++)
		nvme_validate_ns(ctrl, i);

3152
	nvme_remove_invalid_namespaces(ctrl, nn);
3153 3154
}

3155
static void nvme_scan_work(struct work_struct *work)
3156
{
3157 3158
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, scan_work);
3159
	struct nvme_id_ctrl *id;
3160
	unsigned nn;
3161

3162 3163 3164
	if (ctrl->state != NVME_CTRL_LIVE)
		return;

3165 3166
	WARN_ON_ONCE(!ctrl->tagset);

3167 3168
	if (nvme_identify_ctrl(ctrl, &id))
		return;
3169 3170

	nn = le32_to_cpu(id->nn);
3171
	if (ctrl->vs >= NVME_VS(1, 1, 0) &&
3172 3173 3174 3175
	    !(ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)) {
		if (!nvme_scan_ns_list(ctrl, nn))
			goto done;
	}
3176
	nvme_scan_ns_sequential(ctrl, nn);
3177
 done:
3178
	mutex_lock(&ctrl->namespaces_mutex);
3179
	list_sort(NULL, &ctrl->namespaces, ns_cmp);
3180
	mutex_unlock(&ctrl->namespaces_mutex);
3181 3182
	kfree(id);
}
3183 3184 3185 3186

void nvme_queue_scan(struct nvme_ctrl *ctrl)
{
	/*
3187
	 * Only new queue scan work when admin and IO queues are both alive
3188 3189
	 */
	if (ctrl->state == NVME_CTRL_LIVE)
3190
		queue_work(nvme_wq, &ctrl->scan_work);
3191 3192
}
EXPORT_SYMBOL_GPL(nvme_queue_scan);
3193

3194 3195 3196 3197 3198
/*
 * 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.
 */
3199 3200 3201 3202
void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
{
	struct nvme_ns *ns, *next;

3203 3204 3205 3206 3207 3208 3209 3210 3211
	/*
	 * 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);

3212 3213 3214
	list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
		nvme_ns_remove(ns);
}
3215
EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
3216

3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232
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]);
}

3233 3234 3235 3236 3237
static void nvme_async_event_work(struct work_struct *work)
{
	struct nvme_ctrl *ctrl =
		container_of(work, struct nvme_ctrl, async_event_work);

3238
	nvme_aen_uevent(ctrl);
3239
	ctrl->ops->submit_async_event(ctrl);
3240 3241
}

3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263
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
3264
	if (nvme_get_log(ctrl, NVME_LOG_FW_SLOT, log, sizeof(*log)))
3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297
		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);
3298
	/* read FW slot information to clear the AER */
3299 3300 3301
	nvme_get_fw_slot_info(ctrl);
}

3302 3303
void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
		union nvme_result *res)
3304
{
3305
	u32 result = le32_to_cpu(res->u32);
3306

3307
	if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS)
3308 3309
		return;

3310 3311 3312 3313 3314 3315
	switch (result & 0x7) {
	case NVME_AER_ERROR:
	case NVME_AER_SMART:
	case NVME_AER_CSS:
	case NVME_AER_VS:
		ctrl->aen_result = result;
3316 3317 3318
		break;
	default:
		break;
3319 3320 3321 3322 3323 3324 3325
	}

	switch (result & 0xff07) {
	case NVME_AER_NOTICE_NS_CHANGED:
		dev_info(ctrl->device, "rescanning\n");
		nvme_queue_scan(ctrl);
		break;
3326
	case NVME_AER_NOTICE_FW_ACT_STARTING:
3327
		queue_work(nvme_wq, &ctrl->fw_act_work);
3328
		break;
3329 3330 3331
	default:
		dev_warn(ctrl->device, "async event result %08x\n", result);
	}
3332
	queue_work(nvme_wq, &ctrl->async_event_work);
3333 3334
}
EXPORT_SYMBOL_GPL(nvme_complete_async_event);
3335

3336
void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
3337
{
3338
	nvme_stop_keep_alive(ctrl);
3339
	flush_work(&ctrl->async_event_work);
3340
	flush_work(&ctrl->scan_work);
3341
	cancel_work_sync(&ctrl->fw_act_work);
3342 3343 3344 3345 3346 3347 3348 3349 3350 3351
}
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);
3352
		queue_work(nvme_wq, &ctrl->async_event_work);
3353 3354 3355 3356
		nvme_start_queues(ctrl);
	}
}
EXPORT_SYMBOL_GPL(nvme_start_ctrl);
3357

3358 3359
void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
{
3360
	cdev_device_del(&ctrl->cdev, ctrl->device);
3361
}
3362
EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
3363

3364
static void nvme_free_ctrl(struct device *dev)
3365
{
3366 3367
	struct nvme_ctrl *ctrl =
		container_of(dev, struct nvme_ctrl, ctrl_device);
C
Christoph Hellwig 已提交
3368
	struct nvme_subsystem *subsys = ctrl->subsys;
3369

3370
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3371
	kfree(ctrl->effects);
3372

C
Christoph Hellwig 已提交
3373 3374 3375 3376 3377 3378
	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));
	}
3379 3380 3381

	ctrl->ops->free_ctrl(ctrl);

C
Christoph Hellwig 已提交
3382 3383
	if (subsys)
		nvme_put_subsystem(subsys);
3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395
}

/*
 * 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;

3396 3397
	ctrl->state = NVME_CTRL_NEW;
	spin_lock_init(&ctrl->lock);
3398
	INIT_LIST_HEAD(&ctrl->namespaces);
3399
	mutex_init(&ctrl->namespaces_mutex);
3400 3401 3402
	ctrl->dev = dev;
	ctrl->ops = ops;
	ctrl->quirks = quirks;
3403
	INIT_WORK(&ctrl->scan_work, nvme_scan_work);
3404
	INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
3405
	INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
3406
	INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work);
3407

3408 3409
	ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL);
	if (ret < 0)
3410
		goto out;
3411
	ctrl->instance = ret;
3412

3413 3414
	device_initialize(&ctrl->ctrl_device);
	ctrl->device = &ctrl->ctrl_device;
3415
	ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance);
3416 3417 3418 3419 3420 3421 3422
	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)
3423 3424
		goto out_release_instance;

3425 3426 3427
	cdev_init(&ctrl->cdev, &nvme_dev_fops);
	ctrl->cdev.owner = ops->module;
	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
3428 3429
	if (ret)
		goto out_free_name;
3430

3431 3432 3433 3434 3435 3436 3437 3438
	/*
	 * 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));

3439
	return 0;
3440 3441
out_free_name:
	kfree_const(dev->kobj.name);
3442
out_release_instance:
3443
	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
3444 3445 3446
out:
	return ret;
}
3447
EXPORT_SYMBOL_GPL(nvme_init_ctrl);
3448

3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459
/**
 * 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;

3460
	mutex_lock(&ctrl->namespaces_mutex);
M
Ming Lei 已提交
3461

3462
	/* Forcibly unquiesce queues to avoid blocking dispatch */
3463 3464
	if (ctrl->admin_q)
		blk_mq_unquiesce_queue(ctrl->admin_q);
3465

3466
	list_for_each_entry(ns, &ctrl->namespaces, list) {
3467 3468 3469 3470
		/*
		 * Revalidating a dead namespace sets capacity to 0. This will
		 * end buffered writers dirtying pages that can't be synced.
		 */
3471 3472 3473
		if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
			continue;
		revalidate_disk(ns->disk);
3474
		blk_set_queue_dying(ns->queue);
3475

3476 3477
		/* Forcibly unquiesce queues to avoid blocking dispatch */
		blk_mq_unquiesce_queue(ns->queue);
3478
	}
3479
	mutex_unlock(&ctrl->namespaces_mutex);
3480
}
3481
EXPORT_SYMBOL_GPL(nvme_kill_queues);
3482

K
Keith Busch 已提交
3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524
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)
3525
		blk_freeze_queue_start(ns->queue);
K
Keith Busch 已提交
3526 3527 3528 3529
	mutex_unlock(&ctrl->namespaces_mutex);
}
EXPORT_SYMBOL_GPL(nvme_start_freeze);

3530
void nvme_stop_queues(struct nvme_ctrl *ctrl)
3531 3532 3533
{
	struct nvme_ns *ns;

3534
	mutex_lock(&ctrl->namespaces_mutex);
3535
	list_for_each_entry(ns, &ctrl->namespaces, list)
3536
		blk_mq_quiesce_queue(ns->queue);
3537
	mutex_unlock(&ctrl->namespaces_mutex);
3538
}
3539
EXPORT_SYMBOL_GPL(nvme_stop_queues);
3540

3541
void nvme_start_queues(struct nvme_ctrl *ctrl)
3542 3543 3544
{
	struct nvme_ns *ns;

3545
	mutex_lock(&ctrl->namespaces_mutex);
3546
	list_for_each_entry(ns, &ctrl->namespaces, list)
3547
		blk_mq_unquiesce_queue(ns->queue);
3548
	mutex_unlock(&ctrl->namespaces_mutex);
3549
}
3550
EXPORT_SYMBOL_GPL(nvme_start_queues);
3551

S
Sagi Grimberg 已提交
3552 3553 3554 3555 3556 3557 3558 3559 3560 3561
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);

3562 3563
int __init nvme_core_init(void)
{
3564
	int result = -ENOMEM;
3565

3566 3567 3568
	nvme_wq = alloc_workqueue("nvme-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_wq)
3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579
		goto out;

	nvme_reset_wq = alloc_workqueue("nvme-reset-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_reset_wq)
		goto destroy_wq;

	nvme_delete_wq = alloc_workqueue("nvme-delete-wq",
			WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
	if (!nvme_delete_wq)
		goto destroy_reset_wq;
3580

3581
	result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme");
3582
	if (result < 0)
3583
		goto destroy_delete_wq;
3584 3585 3586 3587 3588 3589 3590

	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
3591 3592 3593 3594 3595
	nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem");
	if (IS_ERR(nvme_subsys_class)) {
		result = PTR_ERR(nvme_subsys_class);
		goto destroy_class;
	}
3596
	return 0;
3597

C
Christoph Hellwig 已提交
3598 3599
destroy_class:
	class_destroy(nvme_class);
3600
unregister_chrdev:
3601
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3602 3603 3604 3605
destroy_delete_wq:
	destroy_workqueue(nvme_delete_wq);
destroy_reset_wq:
	destroy_workqueue(nvme_reset_wq);
3606 3607
destroy_wq:
	destroy_workqueue(nvme_wq);
3608
out:
3609
	return result;
3610 3611 3612 3613
}

void nvme_core_exit(void)
{
C
Christoph Hellwig 已提交
3614 3615
	ida_destroy(&nvme_subsystems_ida);
	class_destroy(nvme_subsys_class);
3616
	class_destroy(nvme_class);
3617
	unregister_chrdev_region(nvme_chr_devt, NVME_MINORS);
3618 3619
	destroy_workqueue(nvme_delete_wq);
	destroy_workqueue(nvme_reset_wq);
3620
	destroy_workqueue(nvme_wq);
3621
}
3622 3623 3624 3625 3626

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