/
core.c
3753 lines (3165 loc) · 93.2 KB
/
core.c
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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>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/kernel.h>
#include <linux/module.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>
#define CREATE_TRACE_POINTS
#include "trace.h"
#include "nvme.h"
#include "fabrics.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 DEFINE_IDA(nvme_subsystems_ida);
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 void nvme_ns_remove(struct nvme_ns *ns);
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;
revalidate_disk(ns->disk);
blk_set_queue_dying(ns->queue);
/* Forcibly unquiesce queues to avoid blocking dispatch */
blk_mq_unquiesce_queue(ns->queue);
}
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)
queue_work(nvme_wq, &ctrl->scan_work);
}
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 &&
ctrl->state != NVME_CTRL_ADMIN_ONLY)
ret = -ENETRESET;
}
return ret;
}
EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
static void nvme_delete_ctrl_work(struct work_struct *work)
{
struct nvme_ctrl *ctrl =
container_of(work, struct nvme_ctrl, delete_work);
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);
}
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);
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);
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(struct request *req)
{
switch (nvme_req(req)->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;
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;
}
void nvme_complete_rq(struct request *req)
{
blk_status_t status = nvme_error_status(req);
trace_nvme_complete_rq(req);
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_req(req)->retries++;
blk_mq_requeue_request(req, true);
return;
}
}
blk_mq_end_request(req, status);
}
EXPORT_SYMBOL_GPL(nvme_complete_rq);
void nvme_cancel_request(struct request *req, void *data, bool reserved)
{
dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
"Cancelling I/O %d", req->tag);
nvme_req(req)->status = NVME_SC_ABORT_REQ;
blk_mq_complete_request(req);
}
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_ADMIN_ONLY:
switch (old_state) {
case NVME_CTRL_CONNECTING:
changed = true;
/* FALLTHRU */
default:
break;
}
break;
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:
case NVME_CTRL_ADMIN_ONLY:
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_ADMIN_ONLY:
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;
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);
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_quiesced(&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)
{
memset(cmnd, 0, sizeof(*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;
range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
if (!range)
return BLK_STS_RESOURCE;
__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;
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)) {
kfree(range);
return BLK_STS_IOERR;
}
memset(cmnd, 0, sizeof(*cmnd));
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 = sizeof(*range) * segments;
req->rq_flags |= RQF_SPECIAL_PAYLOAD;
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;
memset(cmnd, 0, sizeof(*cmnd));
cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id);
cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
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;
} else if (req_op(req) == REQ_OP_WRITE) {
t10_pi_prepare(req, ns->pi_type);
}
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 (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
nvme_req(req)->status == 0) {
struct nvme_ns *ns = req->rq_disk->private_data;
t10_pi_complete(req, ns->pi_type,
blk_rq_bytes(req) >> ns->lba_shift);
}
if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
kfree(page_address(req->special_vec.bv_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);
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:
/* currently only aliased to deallocate for a few ctrls: */
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);
/*
* 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)
{
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;
}
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);
}
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, u32 *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 = le32_to_cpu(nvme_req(req)->result.u32);
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;
blk_mq_free_request(rq);
if (status) {
dev_err(ctrl->device,
"failed nvme_keep_alive_end_io error=%d\n",
status);
return;
}
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);
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 struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
unsigned nsid)
{
struct nvme_id_ns *id;