blob: 667f18f465be1c6d35e52685f29095665efba00e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* NVM Express device driver
* Copyright (c) 2011-2014, Intel Corporation.
*/
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/list_sort.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/pr.h>
#include <linux/ptrace.h>
#include <linux/nvme_ioctl.h>
#include <linux/t10-pi.h>
#include <linux/pm_qos.h>
#include <asm/unaligned.h>
#include "nvme.h"
#include "fabrics.h"
#define CREATE_TRACE_POINTS
#include "trace.h"
#define NVME_MINORS (1U << MINORBITS)
unsigned int admin_timeout = 60;
module_param(admin_timeout, uint, 0644);
MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
EXPORT_SYMBOL_GPL(admin_timeout);
unsigned int nvme_io_timeout = 30;
module_param_named(io_timeout, nvme_io_timeout, uint, 0644);
MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
EXPORT_SYMBOL_GPL(nvme_io_timeout);
static unsigned char shutdown_timeout = 5;
module_param(shutdown_timeout, byte, 0644);
MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
static u8 nvme_max_retries = 5;
module_param_named(max_retries, nvme_max_retries, byte, 0644);
MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
static unsigned long default_ps_max_latency_us = 100000;
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");
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");
static bool streams;
module_param(streams, bool, 0644);
MODULE_PARM_DESC(streams, "turn on support for Streams write directives");
/*
* 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.
*/
struct workqueue_struct *nvme_wq;
EXPORT_SYMBOL_GPL(nvme_wq);
struct workqueue_struct *nvme_reset_wq;
EXPORT_SYMBOL_GPL(nvme_reset_wq);
struct workqueue_struct *nvme_delete_wq;
EXPORT_SYMBOL_GPL(nvme_delete_wq);
static LIST_HEAD(nvme_subsystems);
static DEFINE_MUTEX(nvme_subsystems_lock);
static DEFINE_IDA(nvme_instance_ida);
static dev_t nvme_chr_devt;
static struct class *nvme_class;
static struct class *nvme_subsys_class;
static int nvme_revalidate_disk(struct gendisk *disk);
static void nvme_put_subsystem(struct nvme_subsystem *subsys);
static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
unsigned nsid);
static void nvme_set_queue_dying(struct nvme_ns *ns)
{
/*
* Revalidating a dead namespace sets capacity to 0. This will end
* buffered writers dirtying pages that can't be synced.
*/
if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
return;
blk_set_queue_dying(ns->queue);
/* Forcibly unquiesce queues to avoid blocking dispatch */
blk_mq_unquiesce_queue(ns->queue);
/*
* Revalidate after unblocking dispatchers that may be holding bd_butex
*/
revalidate_disk(ns->disk);
}
static void nvme_queue_scan(struct nvme_ctrl *ctrl)
{
/*
* Only new queue scan work when admin and IO queues are both alive
*/
if (ctrl->state == NVME_CTRL_LIVE && ctrl->tagset)
queue_work(nvme_wq, &ctrl->scan_work);
}
/*
* Use this function to proceed with scheduling reset_work for a controller
* that had previously been set to the resetting state. This is intended for
* code paths that can't be interrupted by other reset attempts. A hot removal
* may prevent this from succeeding.
*/
int nvme_try_sched_reset(struct nvme_ctrl *ctrl)
{
if (ctrl->state != NVME_CTRL_RESETTING)
return -EBUSY;
if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
return -EBUSY;
return 0;
}
EXPORT_SYMBOL_GPL(nvme_try_sched_reset);
int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
{
if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
return -EBUSY;
if (!queue_work(nvme_reset_wq, &ctrl->reset_work))
return -EBUSY;
return 0;
}
EXPORT_SYMBOL_GPL(nvme_reset_ctrl);
int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
{
int ret;
ret = nvme_reset_ctrl(ctrl);
if (!ret) {
flush_work(&ctrl->reset_work);
if (ctrl->state != NVME_CTRL_LIVE)
ret = -ENETRESET;
}
return ret;
}
EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl)
{
dev_info(ctrl->device,
"Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);
flush_work(&ctrl->reset_work);
nvme_stop_ctrl(ctrl);
nvme_remove_namespaces(ctrl);
ctrl->ops->delete_ctrl(ctrl);
nvme_uninit_ctrl(ctrl);
nvme_put_ctrl(ctrl);
}
static void nvme_delete_ctrl_work(struct work_struct *work)
{
struct nvme_ctrl *ctrl =
container_of(work, struct nvme_ctrl, delete_work);
nvme_do_delete_ctrl(ctrl);
}
int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
{
if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
return -EBUSY;
if (!queue_work(nvme_delete_wq, &ctrl->delete_work))
return -EBUSY;
return 0;
}
EXPORT_SYMBOL_GPL(nvme_delete_ctrl);
static int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
{
int ret = 0;
/*
* Keep a reference until nvme_do_delete_ctrl() complete,
* since ->delete_ctrl can free the controller.
*/
nvme_get_ctrl(ctrl);
if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
ret = -EBUSY;
if (!ret)
nvme_do_delete_ctrl(ctrl);
nvme_put_ctrl(ctrl);
return ret;
}
static inline bool nvme_ns_has_pi(struct nvme_ns *ns)
{
return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple);
}
static blk_status_t nvme_error_status(u16 status)
{
switch (status & 0x7ff) {
case NVME_SC_SUCCESS:
return BLK_STS_OK;
case NVME_SC_CAP_EXCEEDED:
return BLK_STS_NOSPC;
case NVME_SC_LBA_RANGE:
return BLK_STS_TARGET;
case NVME_SC_BAD_ATTRIBUTES:
case NVME_SC_ONCS_NOT_SUPPORTED:
case NVME_SC_INVALID_OPCODE:
case NVME_SC_INVALID_FIELD:
case NVME_SC_INVALID_NS:
return BLK_STS_NOTSUPP;
case NVME_SC_WRITE_FAULT:
case NVME_SC_READ_ERROR:
case NVME_SC_UNWRITTEN_BLOCK:
case NVME_SC_ACCESS_DENIED:
case NVME_SC_READ_ONLY:
case NVME_SC_COMPARE_FAILED:
return BLK_STS_MEDIUM;
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;
case NVME_SC_HOST_PATH_ERROR:
return BLK_STS_TRANSPORT;
default:
return BLK_STS_IOERR;
}
}
static inline bool nvme_req_needs_retry(struct request *req)
{
if (blk_noretry_request(req))
return false;
if (nvme_req(req)->status & NVME_SC_DNR)
return false;
if (nvme_req(req)->retries >= nvme_max_retries)
return false;
return true;
}
static void nvme_retry_req(struct request *req)
{
struct nvme_ns *ns = req->q->queuedata;
unsigned long delay = 0;
u16 crd;
/* The mask and shift result must be <= 3 */
crd = (nvme_req(req)->status & NVME_SC_CRD) >> 11;
if (ns && crd)
delay = ns->ctrl->crdt[crd - 1] * 100;
nvme_req(req)->retries++;
blk_mq_requeue_request(req, false);
blk_mq_delay_kick_requeue_list(req->q, delay);
}
void nvme_complete_rq(struct request *req)
{
blk_status_t status = nvme_error_status(nvme_req(req)->status);
trace_nvme_complete_rq(req);
nvme_cleanup_cmd(req);
if (nvme_req(req)->ctrl->kas)
nvme_req(req)->ctrl->comp_seen = true;
if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
if ((req->cmd_flags & REQ_NVME_MPATH) &&
blk_path_error(status)) {
nvme_failover_req(req);
return;
}
if (!blk_queue_dying(req->q)) {
nvme_retry_req(req);
return;
}
}
nvme_trace_bio_complete(req, status);
blk_mq_end_request(req, status);
}
EXPORT_SYMBOL_GPL(nvme_complete_rq);
bool nvme_cancel_request(struct request *req, void *data, bool reserved)
{
dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
"Cancelling I/O %d", req->tag);
/* don't abort one completed request */
if (blk_mq_request_completed(req))
return true;
nvme_req(req)->status = NVME_SC_HOST_ABORTED_CMD;
blk_mq_complete_request(req);
return true;
}
EXPORT_SYMBOL_GPL(nvme_cancel_request);
bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
enum nvme_ctrl_state new_state)
{
enum nvme_ctrl_state old_state;
unsigned long flags;
bool changed = false;
spin_lock_irqsave(&ctrl->lock, flags);
old_state = ctrl->state;
switch (new_state) {
case NVME_CTRL_LIVE:
switch (old_state) {
case NVME_CTRL_NEW:
case NVME_CTRL_RESETTING:
case NVME_CTRL_CONNECTING:
changed = true;
/* FALLTHRU */
default:
break;
}
break;
case NVME_CTRL_RESETTING:
switch (old_state) {
case NVME_CTRL_NEW:
case NVME_CTRL_LIVE:
changed = true;
/* FALLTHRU */
default:
break;
}
break;
case NVME_CTRL_CONNECTING:
switch (old_state) {
case NVME_CTRL_NEW:
case NVME_CTRL_RESETTING:
changed = true;
/* FALLTHRU */
default:
break;
}
break;
case NVME_CTRL_DELETING:
switch (old_state) {
case NVME_CTRL_LIVE:
case NVME_CTRL_RESETTING:
case NVME_CTRL_CONNECTING:
changed = true;
/* FALLTHRU */
default:
break;
}
break;
case NVME_CTRL_DEAD:
switch (old_state) {
case NVME_CTRL_DELETING:
changed = true;
/* FALLTHRU */
default:
break;
}
break;
default:
break;
}
if (changed) {
ctrl->state = new_state;
wake_up_all(&ctrl->state_wq);
}
spin_unlock_irqrestore(&ctrl->lock, flags);
if (changed && ctrl->state == NVME_CTRL_LIVE)
nvme_kick_requeue_lists(ctrl);
return changed;
}
EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
/*
* Returns true for sink states that can't ever transition back to live.
*/
static bool nvme_state_terminal(struct nvme_ctrl *ctrl)
{
switch (ctrl->state) {
case NVME_CTRL_NEW:
case NVME_CTRL_LIVE:
case NVME_CTRL_RESETTING:
case NVME_CTRL_CONNECTING:
return false;
case NVME_CTRL_DELETING:
case NVME_CTRL_DEAD:
return true;
default:
WARN_ONCE(1, "Unhandled ctrl state:%d", ctrl->state);
return true;
}
}
/*
* Waits for the controller state to be resetting, or returns false if it is
* not possible to ever transition to that state.
*/
bool nvme_wait_reset(struct nvme_ctrl *ctrl)
{
wait_event(ctrl->state_wq,
nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING) ||
nvme_state_terminal(ctrl));
return ctrl->state == NVME_CTRL_RESETTING;
}
EXPORT_SYMBOL_GPL(nvme_wait_reset);
static void nvme_free_ns_head(struct kref *ref)
{
struct nvme_ns_head *head =
container_of(ref, struct nvme_ns_head, ref);
nvme_mpath_remove_disk(head);
ida_simple_remove(&head->subsys->ns_ida, head->instance);
list_del_init(&head->entry);
cleanup_srcu_struct(&head->srcu);
nvme_put_subsystem(head->subsys);
kfree(head);
}
static void nvme_put_ns_head(struct nvme_ns_head *head)
{
kref_put(&head->ref, nvme_free_ns_head);
}
static void nvme_free_ns(struct kref *kref)
{
struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
if (ns->ndev)
nvme_nvm_unregister(ns);
put_disk(ns->disk);
nvme_put_ns_head(ns->head);
nvme_put_ctrl(ns->ctrl);
kfree(ns);
}
static void nvme_put_ns(struct nvme_ns *ns)
{
kref_put(&ns->kref, nvme_free_ns);
}
static inline void nvme_clear_nvme_request(struct request *req)
{
if (!(req->rq_flags & RQF_DONTPREP)) {
nvme_req(req)->retries = 0;
nvme_req(req)->flags = 0;
req->rq_flags |= RQF_DONTPREP;
}
}
struct request *nvme_alloc_request(struct request_queue *q,
struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid)
{
unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
struct request *req;
if (qid == NVME_QID_ANY) {
req = blk_mq_alloc_request(q, op, flags);
} else {
req = blk_mq_alloc_request_hctx(q, op, flags,
qid ? qid - 1 : 0);
}
if (IS_ERR(req))
return req;
req->cmd_flags |= REQ_FAILFAST_DRIVER;
nvme_clear_nvme_request(req);
nvme_req(req)->cmd = cmd;
return req;
}
EXPORT_SYMBOL_GPL(nvme_alloc_request);
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;
c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
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);
c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
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;
ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
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;
}
static inline void nvme_setup_flush(struct nvme_ns *ns,
struct nvme_command *cmnd)
{
cmnd->common.opcode = nvme_cmd_flush;
cmnd->common.nsid = cpu_to_le32(ns->head->ns_id);
}
static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmnd)
{
unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
struct nvme_dsm_range *range;
struct bio *bio;
/*
* Some devices do not consider the DSM 'Number of Ranges' field when
* determining how much data to DMA. Always allocate memory for maximum
* number of segments to prevent device reading beyond end of buffer.
*/
static const size_t alloc_size = sizeof(*range) * NVME_DSM_MAX_RANGES;
range = kzalloc(alloc_size, GFP_ATOMIC | __GFP_NOWARN);
if (!range) {
/*
* If we fail allocation our range, fallback to the controller
* discard page. If that's also busy, it's safe to return
* busy, as we know we can make progress once that's freed.
*/
if (test_and_set_bit_lock(0, &ns->ctrl->discard_page_busy))
return BLK_STS_RESOURCE;
range = page_address(ns->ctrl->discard_page);
}
__rq_for_each_bio(bio, req) {
u64 slba = nvme_sect_to_lba(ns, bio->bi_iter.bi_sector);
u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
if (n < segments) {
range[n].cattr = cpu_to_le32(0);
range[n].nlb = cpu_to_le32(nlb);
range[n].slba = cpu_to_le64(slba);
}
n++;
}
if (WARN_ON_ONCE(n != segments)) {
if (virt_to_page(range) == ns->ctrl->discard_page)
clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
else
kfree(range);
return BLK_STS_IOERR;
}
cmnd->dsm.opcode = nvme_cmd_dsm;
cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id);
cmnd->dsm.nr = cpu_to_le32(segments - 1);
cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
req->special_vec.bv_page = virt_to_page(range);
req->special_vec.bv_offset = offset_in_page(range);
req->special_vec.bv_len = alloc_size;
req->rq_flags |= RQF_SPECIAL_PAYLOAD;
return BLK_STS_OK;
}
static inline blk_status_t nvme_setup_write_zeroes(struct nvme_ns *ns,
struct request *req, struct nvme_command *cmnd)
{
if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
return nvme_setup_discard(ns, req, cmnd);
cmnd->write_zeroes.opcode = nvme_cmd_write_zeroes;
cmnd->write_zeroes.nsid = cpu_to_le32(ns->head->ns_id);
cmnd->write_zeroes.slba =
cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
cmnd->write_zeroes.length =
cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
cmnd->write_zeroes.control = 0;
return BLK_STS_OK;
}
static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
struct request *req, struct nvme_command *cmnd)
{
struct nvme_ctrl *ctrl = ns->ctrl;
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;
cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
cmnd->rw.slba = cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);
if (ns->ms) {
/*
* 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;
}
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(t10_pi_ref_tag(req));
break;
}
}
cmnd->rw.control = cpu_to_le16(control);
cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
return 0;
}
void nvme_cleanup_cmd(struct request *req)
{
if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
struct nvme_ns *ns = req->rq_disk->private_data;
struct page *page = req->special_vec.bv_page;
if (page == ns->ctrl->discard_page)
clear_bit_unlock(0, &ns->ctrl->discard_page_busy);
else
kfree(page_address(page) + req->special_vec.bv_offset);
}
}
EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);
blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmd)
{
blk_status_t ret = BLK_STS_OK;
nvme_clear_nvme_request(req);
memset(cmd, 0, sizeof(*cmd));
switch (req_op(req)) {
case REQ_OP_DRV_IN:
case REQ_OP_DRV_OUT:
memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
break;
case REQ_OP_FLUSH:
nvme_setup_flush(ns, cmd);
break;
case REQ_OP_WRITE_ZEROES:
ret = nvme_setup_write_zeroes(ns, req, cmd);
break;
case REQ_OP_DISCARD:
ret = nvme_setup_discard(ns, req, cmd);
break;
case REQ_OP_READ:
case REQ_OP_WRITE:
ret = nvme_setup_rw(ns, req, cmd);
break;
default:
WARN_ON_ONCE(1);
return BLK_STS_IOERR;
}
cmd->common.command_id = req->tag;
trace_nvme_setup_cmd(req, cmd);
return ret;
}
EXPORT_SYMBOL_GPL(nvme_setup_cmd);
static void nvme_end_sync_rq(struct request *rq, blk_status_t error)
{
struct completion *waiting = rq->end_io_data;
rq->end_io_data = NULL;
complete(waiting);
}
static void nvme_execute_rq_polled(struct request_queue *q,
struct gendisk *bd_disk, struct request *rq, int at_head)
{
DECLARE_COMPLETION_ONSTACK(wait);
WARN_ON_ONCE(!test_bit(QUEUE_FLAG_POLL, &q->queue_flags));
rq->cmd_flags |= REQ_HIPRI;
rq->end_io_data = &wait;
blk_execute_rq_nowait(q, bd_disk, rq, at_head, nvme_end_sync_rq);
while (!completion_done(&wait)) {
blk_poll(q, request_to_qc_t(rq->mq_hctx, rq), true);
cond_resched();
}
}
/*
* 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,
union nvme_result *result, void *buffer, unsigned bufflen,
unsigned timeout, int qid, int at_head,
blk_mq_req_flags_t flags, bool poll)
{
struct request *req;
int ret;
req = nvme_alloc_request(q, cmd, flags, qid);
if (IS_ERR(req))
return PTR_ERR(req);
req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
if (buffer && bufflen) {
ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
if (ret)
goto out;
}
if (poll)
nvme_execute_rq_polled(req->q, NULL, req, at_head);
else
blk_execute_rq(req->q, NULL, req, at_head);
if (result)
*result = nvme_req(req)->result;
if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
ret = -EINTR;
else
ret = nvme_req(req)->status;
out:
blk_mq_free_request(req);
return ret;
}
EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buffer, unsigned bufflen)
{
return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
NVME_QID_ANY, 0, 0, false);
}
EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
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);
}
static int nvme_submit_user_cmd(struct request_queue *q,
struct nvme_command *cmd, void __user *ubuffer,
unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
u32 meta_seed, u64 *result, unsigned timeout)
{
bool write = nvme_is_write(cmd);
struct nvme_ns *ns = q->queuedata;
struct gendisk *disk = ns ? ns->disk : NULL;
struct request *req;
struct bio *bio = NULL;
void *meta = NULL;
int ret;
req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
if (IS_ERR(req))
return PTR_ERR(req);
req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
nvme_req(req)->flags |= NVME_REQ_USERCMD;
if (ubuffer && bufflen) {
ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
GFP_KERNEL);
if (ret)
goto out;
bio = req->bio;
bio->bi_disk = disk;
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);
goto out_unmap;
}
req->cmd_flags |= REQ_INTEGRITY;
}
}
blk_execute_rq(req->q, disk, req, 0);
if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
ret = -EINTR;
else
ret = nvme_req(req)->status;
if (result)
*result = le64_to_cpu(nvme_req(req)->result.u64);
if (meta && !ret && !write) {
if (copy_to_user(meta_buffer, meta, meta_len))
ret = -EFAULT;
}
kfree(meta);
out_unmap:
if (bio)
blk_rq_unmap_user(bio);
out:
blk_mq_free_request(req);
return ret;
}
static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
{
struct nvme_ctrl *ctrl = rq->end_io_data;
unsigned long flags;
bool startka = false;
blk_mq_free_request(rq);
if (status) {
dev_err(ctrl->device,
"failed nvme_keep_alive_end_io error=%d\n",
status);
return;
}
ctrl->comp_seen = false;
spin_lock_irqsave(&ctrl->lock, flags);
if (ctrl->state == NVME_CTRL_LIVE ||
ctrl->state == NVME_CTRL_CONNECTING)
startka = true;
spin_unlock_irqrestore(&ctrl->lock, flags);
if (startka)
schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
}
static int nvme_keep_alive(struct nvme_ctrl *ctrl)
{
struct request *rq;
rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
NVME_QID_ANY);
if (IS_ERR(rq))
return PTR_ERR(rq);
rq->timeout = ctrl->kato * HZ;
rq->end_io_data = ctrl;
blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
return 0;
}
static void nvme_keep_alive_work(struct work_struct *work)
{
struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
struct nvme_ctrl, ka_work);
bool comp_seen = ctrl->comp_seen;
if ((ctrl->ctratt & NVME_CTRL_ATTR_TBKAS) && comp_seen) {
dev_dbg(ctrl->device,
"reschedule traffic based keep-alive timer\n");
ctrl->comp_seen = false;
schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
return;
}
if (nvme_keep_alive(ctrl)) {
/* allocation failure, reset the controller */
dev_err(ctrl->device, "keep-alive failed\n");
nvme_reset_ctrl(ctrl);
return;
}
}
static void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
{
if (unlikely(ctrl->kato == 0))
return;
schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
}
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);
static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
{
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;
c.identify.cns = NVME_ID_CNS_CTRL;
*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;
}
static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
struct nvme_ns_ids *ids)
{
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;
status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
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) {
dev_warn(ctrl->device,
"ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
cur->nidl);
goto free_data;
}
len = NVME_NIDT_EUI64_LEN;
memcpy(ids->eui64, data + pos + sizeof(*cur), len);
break;
case NVME_NIDT_NGUID:
if (cur->nidl != NVME_NIDT_NGUID_LEN) {
dev_warn(ctrl->device,
"ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
cur->nidl);
goto free_data;
}
len = NVME_NIDT_NGUID_LEN;
memcpy(ids->nguid, data + pos + sizeof(*cur), len);
break;
case NVME_NIDT_UUID:
if (cur->nidl != NVME_NIDT_UUID_LEN) {
dev_warn(ctrl->device,
"ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
cur->nidl);
goto free_data;
}
len = NVME_NIDT_UUID_LEN;
uuid_copy(&ids->uuid, data + pos + sizeof(*cur));
break;
default:
/* Skip unknown types */
len = cur->nidl;
break;
}
len += sizeof(*cur);
}
free_data:
kfree(data);
return status;
}
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;
c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
c.identify.nsid = cpu_to_le32(nsid);
return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list,
NVME_IDENTIFY_DATA_SIZE);
}
static int nvme_identify_ns(struct nvme_ctrl *ctrl,
unsigned nsid, struct nvme_id_ns **id)
{
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;
c.identify.nsid = cpu_to_le32(nsid);
c.identify.cns = NVME_ID_CNS_NS;
*id = kmalloc(sizeof(**id), GFP_KERNEL);
if (!*id)
return -ENOMEM;
error = nvme_submit_sync_cmd(ctrl->admin_q, &c, *id, sizeof(**id));
if (error) {
dev_warn(ctrl->device, "Identify namespace failed (%d)\n", error);
kfree(*id);
}
return error;
}
static int nvme_features(struct nvme_ctrl *dev, u8 op, unsigned int fid,
unsigned int dword11, void *buffer, size_t buflen, u32 *result)
{
struct nvme_command c;
union nvme_result res;
int ret;
memset(&c, 0, sizeof(c));
c.features.opcode = op;
c.features.fid = cpu_to_le32(fid);
c.features.dword11 = cpu_to_le32(dword11);
ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
buffer, buflen, 0, NVME_QID_ANY, 0, 0, false);
if (ret >= 0 && result)
*result = le32_to_cpu(res.u32);
return ret;
}
int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
unsigned int dword11, void *buffer, size_t buflen,
u32 *result)
{
return nvme_features(dev, nvme_admin_set_features, fid, dword11, buffer,
buflen, result);
}
EXPORT_SYMBOL_GPL(nvme_set_features);
int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
unsigned int dword11, void *buffer, size_t buflen,
u32 *result)
{
return nvme_features(dev, nvme_admin_get_features, fid, dword11, buffer,
buflen, result);
}
EXPORT_SYMBOL_GPL(nvme_get_features);
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;
status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
&result);
if (status < 0)
return status;
/*
* 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) {
dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
*count = 0;
} else {
nr_io_queues = min(result & 0xffff, result >> 16) + 1;
*count = min(*count, nr_io_queues);
}
return 0;
}
EXPORT_SYMBOL_GPL(nvme_set_queue_count);
#define NVME_AEN_SUPPORTED \
(NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_FW_ACT | \
NVME_AEN_CFG_ANA_CHANGE | NVME_AEN_CFG_DISC_CHANGE)
static void nvme_enable_aen(struct nvme_ctrl *ctrl)
{
u32 result, supported_aens = ctrl->oaes & NVME_AEN_SUPPORTED;
int status;
if (!supported_aens)
return;
status = nvme_set_features(ctrl, NVME_FEAT_ASYNC_EVENT, supported_aens,
NULL, 0, &result);
if (status)
dev_warn(ctrl->device, "Failed to configure AEN (cfg %x)\n",
supported_aens);
queue_work(nvme_wq, &ctrl->async_event_work);
}
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;
if (io.flags)
return -EINVAL;
switch (io.opcode) {
case nvme_cmd_write:
case nvme_cmd_read:
case nvme_cmd_compare:
break;
default:
return -EINVAL;
}
length = (io.nblocks + 1) << ns->lba_shift;
meta_len = (io.nblocks + 1) * ns->ms;
metadata = (void __user *)(uintptr_t)io.metadata;
if (ns->ext) {
length += meta_len;
meta_len = 0;
} else if (meta_len) {
if ((io.metadata & 3) || !io.metadata)
return -EINVAL;
}
memset(&c, 0, sizeof(c));
c.rw.opcode = io.opcode;
c.rw.flags = io.flags;
c.rw.nsid = cpu_to_le32(ns->head->ns_id);
c.rw.slba = cpu_to_le64(io.slba);
c.rw.length = cpu_to_le16(io.nblocks);
c.rw.control = cpu_to_le16(io.control);
c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
c.rw.reftag = cpu_to_le32(io.reftag);
c.rw.apptag = cpu_to_le16(io.apptag);
c.rw.appmask = cpu_to_le16(io.appmask);
return nvme_submit_user_cmd(ns->queue, &c,
(void __user *)(uintptr_t)io.addr, length,
metadata, meta_len, lower_32_bits(io.slba), NULL, 0);
}
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 | NVME_CMD_EFFECTS_LBCC))
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->acs[opcode]);
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)) {
mutex_lock(&ctrl->scan_lock);
mutex_lock(&ctrl->subsys->lock);
nvme_mpath_start_freeze(ctrl->subsys);
nvme_mpath_wait_freeze(ctrl->subsys);
nvme_start_freeze(ctrl);
nvme_wait_freeze(ctrl);
}
return effects;
}
static void nvme_update_formats(struct nvme_ctrl *ctrl)
{
struct nvme_ns *ns;
down_read(&ctrl->namespaces_rwsem);
list_for_each_entry(ns, &ctrl->namespaces, list)
if (ns->disk && nvme_revalidate_disk(ns->disk))
nvme_set_queue_dying(ns);
up_read(&ctrl->namespaces_rwsem);
}
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);
nvme_mpath_unfreeze(ctrl->subsys);
mutex_unlock(&ctrl->subsys->lock);
nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL);
mutex_unlock(&ctrl->scan_lock);
}
if (effects & NVME_CMD_EFFECTS_CCC)
nvme_init_identify(ctrl);
if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
nvme_queue_scan(ctrl);
}
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
struct nvme_passthru_cmd __user *ucmd)
{
struct nvme_passthru_cmd cmd;
struct nvme_command c;
unsigned timeout = 0;
u32 effects;
u64 result;
int status;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
return -EFAULT;
if (cmd.flags)
return -EINVAL;
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 = cpu_to_le32(cmd.cdw10);
c.common.cdw11 = cpu_to_le32(cmd.cdw11);
c.common.cdw12 = cpu_to_le32(cmd.cdw12);
c.common.cdw13 = cpu_to_le32(cmd.cdw13);
c.common.cdw14 = cpu_to_le32(cmd.cdw14);
c.common.cdw15 = cpu_to_le32(cmd.cdw15);
if (cmd.timeout_ms)
timeout = msecs_to_jiffies(cmd.timeout_ms);
effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
(void __user *)(uintptr_t)cmd.metadata,
cmd.metadata_len, 0, &result, timeout);
nvme_passthru_end(ctrl, effects);
if (status >= 0) {
if (put_user(result, &ucmd->result))
return -EFAULT;
}
return status;
}
static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
struct nvme_passthru_cmd64 __user *ucmd)
{
struct nvme_passthru_cmd64 cmd;
struct nvme_command c;
unsigned timeout = 0;
u32 effects;
int status;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
return -EFAULT;
if (cmd.flags)
return -EINVAL;
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 = cpu_to_le32(cmd.cdw10);
c.common.cdw11 = cpu_to_le32(cmd.cdw11);
c.common.cdw12 = cpu_to_le32(cmd.cdw12);
c.common.cdw13 = cpu_to_le32(cmd.cdw13);
c.common.cdw14 = cpu_to_le32(cmd.cdw14);
c.common.cdw15 = cpu_to_le32(cmd.cdw15);
if (cmd.timeout_ms)
timeout = msecs_to_jiffies(cmd.timeout_ms);
effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
(void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len,
0, &cmd.result, timeout);
nvme_passthru_end(ctrl, effects);
if (status >= 0) {
if (put_user(cmd.result, &ucmd->result))
return -EFAULT;
}
return status;
}
/*
* 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)
{
#ifdef CONFIG_NVME_MULTIPATH
if (disk->fops == &nvme_ns_head_ops) {
struct nvme_ns *ns;
*head = disk->private_data;
*srcu_idx = srcu_read_lock(&(*head)->srcu);
ns = nvme_find_path(*head);
if (!ns)
srcu_read_unlock(&(*head)->srcu, *srcu_idx);
return ns;
}
#endif
*head = NULL;
*srcu_idx = -1;
return disk->private_data;
}
static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
{
if (head)
srcu_read_unlock(&head->srcu, idx);
}
static bool is_ctrl_ioctl(unsigned int cmd)
{
if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD)
return true;
if (is_sed_ioctl(cmd))
return true;
return false;
}
static int nvme_handle_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
void __user *argp,
struct nvme_ns_head *head,
int srcu_idx)
{
struct nvme_ctrl *ctrl = ns->ctrl;
int ret;
nvme_get_ctrl(ns->ctrl);
nvme_put_ns_from_disk(head, srcu_idx);
switch (cmd) {
case NVME_IOCTL_ADMIN_CMD:
ret = nvme_user_cmd(ctrl, NULL, argp);
break;
case NVME_IOCTL_ADMIN64_CMD:
ret = nvme_user_cmd64(ctrl, NULL, argp);
break;
default:
ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
break;
}
nvme_put_ctrl(ctrl);
return ret;
}
static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
struct nvme_ns_head *head = NULL;
void __user *argp = (void __user *)arg;
struct nvme_ns *ns;
int srcu_idx, ret;
ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
if (unlikely(!ns))
return -EWOULDBLOCK;
/*
* Handle ioctls that apply to the controller instead of the namespace
* seperately and drop the ns SRCU reference early. This avoids a
* deadlock when deleting namespaces using the passthrough interface.
*/
if (is_ctrl_ioctl(cmd))
return nvme_handle_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
switch (cmd) {
case NVME_IOCTL_ID:
force_successful_syscall_return();
ret = ns->head->ns_id;
break;
case NVME_IOCTL_IO_CMD:
ret = nvme_user_cmd(ns->ctrl, ns, argp);
break;
case NVME_IOCTL_SUBMIT_IO:
ret = nvme_submit_io(ns, argp);
break;
case NVME_IOCTL_IO64_CMD:
ret = nvme_user_cmd64(ns->ctrl, ns, argp);
break;
default:
if (ns->ndev)
ret = nvme_nvm_ioctl(ns, cmd, arg);
else
ret = -ENOTTY;
}
nvme_put_ns_from_disk(head, srcu_idx);
return ret;
}
static int nvme_open(struct block_device *bdev, fmode_t mode)
{
struct nvme_ns *ns = bdev->bd_disk->private_data;
#ifdef CONFIG_NVME_MULTIPATH
/* should never be called due to GENHD_FL_HIDDEN */
if (WARN_ON_ONCE(ns->head->disk))
goto fail;
#endif
if (!kref_get_unless_zero(&ns->kref))
goto fail;
if (!try_module_get(ns->ctrl->ops->module))
goto fail_put_ns;
return 0;
fail_put_ns:
nvme_put_ns(ns);
fail:
return -ENXIO;
}
static void nvme_release(struct gendisk *disk, fmode_t mode)
{
struct nvme_ns *ns = disk->private_data;
module_put(ns->ctrl->ops->module);
nvme_put_ns(ns);
}
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
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
{
struct blk_integrity integrity;
memset(&integrity, 0, sizeof(integrity));
switch (pi_type) {
case NVME_NS_DPS_PI_TYPE3:
integrity.profile = &t10_pi_type3_crc;
integrity.tag_size = sizeof(u16) + sizeof(u32);
integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
break;
case NVME_NS_DPS_PI_TYPE1:
case NVME_NS_DPS_PI_TYPE2:
integrity.profile = &t10_pi_type1_crc;
integrity.tag_size = sizeof(u16);
integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
break;
default:
integrity.profile = NULL;
break;
}
integrity.tuple_size = ms;
blk_integrity_register(disk, &integrity);
blk_queue_max_integrity_segments(disk->queue, 1);
}
#else
static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type)
{
}
#endif /* CONFIG_BLK_DEV_INTEGRITY */
static void nvme_set_chunk_size(struct nvme_ns *ns)
{
u32 chunk_size = nvme_lba_to_sect(ns, ns->noiob);
blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
}
static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
{
struct nvme_ctrl *ctrl = ns->ctrl;
struct request_queue *queue = disk->queue;
u32 size = queue_logical_block_size(queue);
if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, queue);
return;
}
if (ctrl->nr_streams && ns->sws && ns->sgs)
size *= ns->sws * ns->sgs;
BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
NVME_DSM_MAX_RANGES);
queue->limits.discard_alignment = 0;
queue->limits.discard_granularity = size;
/* If discard is already enabled, don't reset queue limits */
if (blk_queue_flag_test_and_set(QUEUE_FLAG_DISCARD, queue))
return;
blk_queue_max_discard_sectors(queue, UINT_MAX);
blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES);
if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
}
static void nvme_config_write_zeroes(struct gendisk *disk, struct nvme_ns *ns)
{
u64 max_blocks;
if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) ||
(ns->ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))
return;
/*
* Even though NVMe spec explicitly states that MDTS is not
* applicable to the write-zeroes:- "The restriction does not apply to
* commands that do not transfer data between the host and the
* controller (e.g., Write Uncorrectable ro Write Zeroes command).".
* In order to be more cautious use controller's max_hw_sectors value
* to configure the maximum sectors for the write-zeroes which is
* configured based on the controller's MDTS field in the
* nvme_init_identify() if available.
*/
if (ns->ctrl->max_hw_sectors == UINT_MAX)
max_blocks = (u64)USHRT_MAX + 1;
else
max_blocks = ns->ctrl->max_hw_sectors + 1;
blk_queue_max_write_zeroes_sectors(disk->queue,
nvme_lba_to_sect(ns, max_blocks));
}
static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
struct nvme_id_ns *id, struct nvme_ns_ids *ids)
{
int ret = 0;
memset(ids, 0, sizeof(*ids));
if (ctrl->vs >= NVME_VS(1, 1, 0))
memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
if (ctrl->vs >= NVME_VS(1, 2, 0))
memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
if (ctrl->vs >= NVME_VS(1, 3, 0)) {
/* Don't treat error as fatal we potentially
* already have a NGUID or EUI-64
*/
ret = nvme_identify_ns_descs(ctrl, nsid, ids);
if (ret)
dev_warn(ctrl->device,
"Identify Descriptors failed (%d)\n", ret);
if (ret > 0)
ret = 0;
}
return ret;
}
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));
}
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;
}
static void nvme_update_disk_info(struct gendisk *disk,
struct nvme_ns *ns, struct nvme_id_ns *id)
{
sector_t capacity = nvme_lba_to_sect(ns, le64_to_cpu(id->nsze));
unsigned short bs = 1 << ns->lba_shift;
u32 atomic_bs, phys_bs, io_opt;
if (ns->lba_shift > PAGE_SHIFT) {
/* unsupported block size, set capacity to 0 later */
bs = (1 << 9);
}
blk_mq_freeze_queue(disk->queue);
blk_integrity_unregister(disk);
if (id->nabo == 0) {
/*
* Bit 1 indicates whether NAWUPF is defined for this namespace
* and whether it should be used instead of AWUPF. If NAWUPF ==
* 0 then AWUPF must be used instead.
*/
if (id->nsfeat & (1 << 1) && id->nawupf)
atomic_bs = (1 + le16_to_cpu(id->nawupf)) * bs;
else
atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs;
} else {
atomic_bs = bs;
}
phys_bs = bs;
io_opt = bs;
if (id->nsfeat & (1 << 4)) {
/* NPWG = Namespace Preferred Write Granularity */
phys_bs *= 1 + le16_to_cpu(id->npwg);
/* NOWS = Namespace Optimal Write Size */
io_opt *= 1 + le16_to_cpu(id->nows);
}
blk_queue_logical_block_size(disk->queue, bs);
/*
* Linux filesystems assume writing a single physical block is
* an atomic operation. Hence limit the physical block size to the
* value of the Atomic Write Unit Power Fail parameter.
*/
blk_queue_physical_block_size(disk->queue, min(phys_bs, atomic_bs));
blk_queue_io_min(disk->queue, phys_bs);
blk_queue_io_opt(disk->queue, io_opt);
if (ns->ms && !ns->ext &&
(ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED))
nvme_init_integrity(disk, ns->ms, ns->pi_type);
if ((ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) ||
ns->lba_shift > PAGE_SHIFT)
capacity = 0;
set_capacity(disk, capacity);
nvme_config_discard(disk, ns);
nvme_config_write_zeroes(disk, ns);
if (id->nsattr & (1 << 0))
set_disk_ro(disk, true);
else
set_disk_ro(disk, false);
blk_mq_unfreeze_queue(disk->queue);
}
static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
{
struct nvme_ns *ns = disk->private_data;
/*
* If identify namespace failed, use default 512 byte block size so
* block layer can use before failing read/write for 0 capacity.
*/
ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
if (ns->lba_shift == 0)
ns->lba_shift = 9;
ns->noiob = le16_to_cpu(id->noiob);
ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
/* 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;
if (ns->noiob)
nvme_set_chunk_size(ns);
nvme_update_disk_info(disk, ns, id);
#ifdef CONFIG_NVME_MULTIPATH
if (ns->head->disk) {
nvme_update_disk_info(ns->head->disk, ns, id);
blk_queue_stack_limits(ns->head->disk->queue, ns->queue);
revalidate_disk(ns->head->disk);
}
#endif
}
static int nvme_revalidate_disk(struct gendisk *disk)
{
struct nvme_ns *ns = disk->private_data;
struct nvme_ctrl *ctrl = ns->ctrl;
struct nvme_id_ns *id;
struct nvme_ns_ids ids;
int ret = 0;
if (test_bit(NVME_NS_DEAD, &ns->flags)) {
set_capacity(disk, 0);
return -ENODEV;
}
ret = nvme_identify_ns(ctrl, ns->head->ns_id, &id);
if (ret)
goto out;
if (id->ncap == 0) {
ret = -ENODEV;
goto free_id;
}
__nvme_revalidate_disk(disk, id);
ret = nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids);
if (ret)
goto free_id;
if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) {
dev_err(ctrl->device,
"identifiers changed for nsid %d\n", ns->head->ns_id);
ret = -ENODEV;
}
free_id:
kfree(id);
out:
/*
* Only fail the function if we got a fatal error back from the
* device, otherwise ignore the error and just move on.
*/
if (ret == -ENOMEM || (ret > 0 && !(ret & NVME_SC_DNR)))
ret = 0;
else if (ret > 0)
ret = blk_status_to_errno(nvme_error_status(ret));
return ret;
}
static char nvme_pr_type(enum pr_type type)
{
switch (type) {
case PR_WRITE_EXCLUSIVE:
return 1;
case PR_EXCLUSIVE_ACCESS:
return 2;
case PR_WRITE_EXCLUSIVE_REG_ONLY:
return 3;
case PR_EXCLUSIVE_ACCESS_REG_ONLY:
return 4;
case PR_WRITE_EXCLUSIVE_ALL_REGS:
return 5;
case PR_EXCLUSIVE_ACCESS_ALL_REGS:
return 6;
default:
return 0;
}
};
static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
u64 key, u64 sa_key, u8 op)
{
struct nvme_ns_head *head = NULL;
struct nvme_ns *ns;
struct nvme_command c;
int srcu_idx, ret;
u8 data[16] = { 0, };
ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx);
if (unlikely(!ns))
return -EWOULDBLOCK;
put_unaligned_le64(key, &data[0]);
put_unaligned_le64(sa_key, &data[8]);
memset(&c, 0, sizeof(c));
c.common.opcode = op;
c.common.nsid = cpu_to_le32(ns->head->ns_id);
c.common.cdw10 = cpu_to_le32(cdw10);
ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16);
nvme_put_ns_from_disk(head, srcu_idx);
return ret;
}
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)
{
u32 cdw10 = 1 | (key ? 1 << 3 : 0);
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,
};
#ifdef CONFIG_BLK_SED_OPAL
int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
bool send)
{
struct nvme_ctrl *ctrl = data;
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 = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
cmd.common.cdw11 = cpu_to_le32(len);
return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0, false);
}
EXPORT_SYMBOL_GPL(nvme_sec_submit);
#endif /* CONFIG_BLK_SED_OPAL */
static const struct block_device_operations nvme_fops = {
.owner = THIS_MODULE,
.ioctl = nvme_ioctl,
.compat_ioctl = nvme_ioctl,
.open = nvme_open,
.release = nvme_release,
.getgeo = nvme_getgeo,
.revalidate_disk= nvme_revalidate_disk,
.pr_ops = &nvme_pr_ops,
};
#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 */
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) {
if (csts == ~0)
return -ENODEV;
if ((csts & NVME_CSTS_RDY) == bit)
break;
msleep(100);
if (fatal_signal_pending(current))
return -EINTR;
if (time_after(jiffies, timeout)) {
dev_err(ctrl->device,
"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)
{
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;
if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
msleep(NVME_QUIRK_DELAY_AMOUNT);
return nvme_wait_ready(ctrl, ctrl->cap, false);
}
EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
int nvme_enable_ctrl(struct nvme_ctrl *ctrl)
{
/*
* 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, page_shift = 12;
int ret;
ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &ctrl->cap);
if (ret) {
dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
return ret;
}
dev_page_min = NVME_CAP_MPSMIN(ctrl->cap) + 12;
if (page_shift < dev_page_min) {
dev_err(ctrl->device,
"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;
ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
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, ctrl->cap, true);
}
EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
{
unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
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)) {
dev_err(ctrl->device,
"Device shutdown incomplete; abort shutdown\n");
return -ENODEV;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
struct request_queue *q)
{
bool vwc = false;
if (ctrl->max_hw_sectors) {
u32 max_segments =
(ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
max_segments = min_not_zero(max_segments, ctrl->max_segments);
blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
}
if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
is_power_of_2(ctrl->max_hw_sectors))
blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
blk_queue_virt_boundary(q, ctrl->page_size - 1);
if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
vwc = true;
blk_queue_write_cache(q, vwc, vwc);
}
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;
}
static int nvme_configure_acre(struct nvme_ctrl *ctrl)
{
struct nvme_feat_host_behavior *host;
int ret;
/* Don't bother enabling the feature if retry delay is not reported */
if (!ctrl->crdt[0])
return 0;
host = kzalloc(sizeof(*host), GFP_KERNEL);
if (!host)
return 0;
host->acre = NVME_ENABLE_ACRE;
ret = nvme_set_features(ctrl, NVME_FEAT_HOST_BEHAVIOR, 0,
host, sizeof(*host), NULL);
kfree(host);
return ret;
}
static int nvme_configure_apst(struct nvme_ctrl *ctrl)
{
/*
* 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
* non-operational state after waiting 50 * (enlat + exlat)
* microseconds, as long as that state's exit latency is under
* 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;
u64 max_lat_us = 0;
int max_ps = -1;
int ret;
/*
* If APST isn't supported or if we haven't been initialized yet,
* then don't do anything.
*/
if (!ctrl->apsta)
return 0;
if (ctrl->npss > 31) {
dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
return 0;
}
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (!table)
return 0;
if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
/* Turn off APST. */
apste = 0;
dev_dbg(ctrl->device, "APST disabled\n");
} 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--) {
u64 total_latency_us, exit_latency_us, transition_ms;
if (target)
table->entries[state] = target;
/*
* 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;
/*
* 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;
exit_latency_us =
(u64)le32_to_cpu(ctrl->psd[state].exit_lat);
if (exit_latency_us > ctrl->ps_max_latency_us)
continue;
total_latency_us =
exit_latency_us +
le32_to_cpu(ctrl->psd[state].entry_lat);
/*
* 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));
if (max_ps == -1)
max_ps = state;
if (total_latency_us > max_lat_us)
max_lat_us = total_latency_us;
}
apste = 1;
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);
}
}
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);
return ret;
}
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);
}
}
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[] = {
{
/*
* 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",
.quirks = NVME_QUIRK_NO_APST,
},
{
/*
* This LiteON CL1-3D*-Q11 firmware version has a race
* condition associated with actions related to suspend to idle
* LiteON has resolved the problem in future firmware
*/
.vid = 0x14a4,
.fr = "22301111",
.quirks = NVME_QUIRK_SIMPLE_SUSPEND,
}
};
/* 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));
}
static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
struct nvme_id_ctrl *id)
{
size_t nqnlen;
int off;
if(!(ctrl->quirks & NVME_QUIRK_IGNORE_DEV_SUBNQN)) {
nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
strlcpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
return;
}
if (ctrl->vs >= NVME_VS(1, 2, 1))
dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
}
/* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
"nqn.2014.08.org.nvmexpress:%04x%04x",
le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
off += sizeof(id->sn);
memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
off += sizeof(id->mn);
memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
}
static void nvme_release_subsystem(struct device *dev)
{
struct nvme_subsystem *subsys =
container_of(dev, struct nvme_subsystem, dev);
if (subsys->instance >= 0)
ida_simple_remove(&nvme_instance_ida, subsys->instance);
kfree(subsys);
}
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);
ida_destroy(&subsys->ns_ida);
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);
/*
* Fail matches for discovery subsystems. This results
* in each discovery controller bound to a unique subsystem.
* This avoids issues with validating controller values
* that can only be true when there is a single unique subsystem.
* There may be multiple and completely independent entities
* that provide discovery controllers.
*/
if (!strcmp(subsysnqn, NVME_DISC_SUBSYS_NAME))
return NULL;
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;
}
#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,
#ifdef CONFIG_NVME_MULTIPATH
&subsys_attr_iopolicy.attr,
#endif
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,
};
static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
{
struct nvme_ctrl *tmp;
lockdep_assert_held(&nvme_subsystems_lock);
list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) {
if (tmp->state == NVME_CTRL_DELETING ||
tmp->state == NVME_CTRL_DEAD)
continue;
if (tmp->cntlid == ctrl->cntlid) {
dev_err(ctrl->device,
"Duplicate cntlid %u with %s, rejecting\n",
ctrl->cntlid, dev_name(tmp->device));
return false;
}
if ((id->cmic & (1 << 1)) ||
(ctrl->opts && ctrl->opts->discovery_nqn))
continue;
dev_err(ctrl->device,
"Subsystem does not support multiple controllers\n");
return false;
}
return true;
}
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;
subsys->instance = -1;
mutex_init(&subsys->lock);
kref_init(&subsys->ref);
INIT_LIST_HEAD(&subsys->ctrls);
INIT_LIST_HEAD(&subsys->nsheads);
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->awupf = le16_to_cpu(id->awupf);
#ifdef CONFIG_NVME_MULTIPATH
subsys->iopolicy = NVME_IOPOLICY_NUMA;
#endif
subsys->dev.class = nvme_subsys_class;
subsys->dev.release = nvme_release_subsystem;
subsys->dev.groups = nvme_subsys_attrs_groups;
dev_set_name(&subsys->dev, "nvme-subsys%d", ctrl->instance);
device_initialize(&subsys->dev);
mutex_lock(&nvme_subsystems_lock);
found = __nvme_find_get_subsystem(subsys->subnqn);
if (found) {
put_device(&subsys->dev);
subsys = found;
if (!nvme_validate_cntlid(subsys, ctrl, id)) {
ret = -EINVAL;
goto out_put_subsystem;
}
} else {
ret = device_add(&subsys->dev);
if (ret) {
dev_err(ctrl->device,
"failed to register subsystem device.\n");
put_device(&subsys->dev);
goto out_unlock;
}
ida_init(&subsys->ns_ida);
list_add_tail(&subsys->entry, &nvme_subsystems);
}
ret = sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
dev_name(ctrl->device));
if (ret) {
dev_err(ctrl->device,
"failed to create sysfs link from subsystem.\n");
goto out_put_subsystem;
}
if (!found)
subsys->instance = ctrl->instance;
ctrl->subsys = subsys;
list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
mutex_unlock(&nvme_subsystems_lock);
return 0;
out_put_subsystem:
nvme_put_subsystem(subsys);
out_unlock: