https://github.com/torvalds/linux
Tip revision: 9561de3a55bed6bdd44a12820ba81ec416e705a7 authored by Linus Torvalds on 04 June 2023, 18:04:27 UTC
Linux 6.4-rc5
Linux 6.4-rc5
Tip revision: 9561de3
zns.c
// SPDX-License-Identifier: GPL-2.0
/*
* NVMe ZNS-ZBD command implementation.
* Copyright (C) 2021 Western Digital Corporation or its affiliates.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/nvme.h>
#include <linux/blkdev.h>
#include "nvmet.h"
/*
* We set the Memory Page Size Minimum (MPSMIN) for target controller to 0
* which gets added by 12 in the nvme_enable_ctrl() which results in 2^12 = 4k
* as page_shift value. When calculating the ZASL use shift by 12.
*/
#define NVMET_MPSMIN_SHIFT 12
static inline u8 nvmet_zasl(unsigned int zone_append_sects)
{
/*
* Zone Append Size Limit (zasl) is expressed as a power of 2 value
* with the minimum memory page size (i.e. 12) as unit.
*/
return ilog2(zone_append_sects >> (NVMET_MPSMIN_SHIFT - 9));
}
static int validate_conv_zones_cb(struct blk_zone *z,
unsigned int i, void *data)
{
if (z->type == BLK_ZONE_TYPE_CONVENTIONAL)
return -EOPNOTSUPP;
return 0;
}
bool nvmet_bdev_zns_enable(struct nvmet_ns *ns)
{
u8 zasl = nvmet_zasl(bdev_max_zone_append_sectors(ns->bdev));
struct gendisk *bd_disk = ns->bdev->bd_disk;
int ret;
if (ns->subsys->zasl) {
if (ns->subsys->zasl > zasl)
return false;
}
ns->subsys->zasl = zasl;
/*
* Generic zoned block devices may have a smaller last zone which is
* not supported by ZNS. Exclude zoned drives that have such smaller
* last zone.
*/
if (get_capacity(bd_disk) & (bdev_zone_sectors(ns->bdev) - 1))
return false;
/*
* ZNS does not define a conventional zone type. If the underlying
* device has a bitmap set indicating the existence of conventional
* zones, reject the device. Otherwise, use report zones to detect if
* the device has conventional zones.
*/
if (ns->bdev->bd_disk->conv_zones_bitmap)
return false;
ret = blkdev_report_zones(ns->bdev, 0, bdev_nr_zones(ns->bdev),
validate_conv_zones_cb, NULL);
if (ret < 0)
return false;
ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
return true;
}
void nvmet_execute_identify_ctrl_zns(struct nvmet_req *req)
{
u8 zasl = req->sq->ctrl->subsys->zasl;
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvme_id_ctrl_zns *id;
u16 status;
id = kzalloc(sizeof(*id), GFP_KERNEL);
if (!id) {
status = NVME_SC_INTERNAL;
goto out;
}
if (ctrl->ops->get_mdts)
id->zasl = min_t(u8, ctrl->ops->get_mdts(ctrl), zasl);
else
id->zasl = zasl;
status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
kfree(id);
out:
nvmet_req_complete(req, status);
}
void nvmet_execute_identify_ns_zns(struct nvmet_req *req)
{
struct nvme_id_ns_zns *id_zns = NULL;
u64 zsze;
u16 status;
u32 mar, mor;
if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
req->error_loc = offsetof(struct nvme_identify, nsid);
status = NVME_SC_INVALID_NS | NVME_SC_DNR;
goto out;
}
id_zns = kzalloc(sizeof(*id_zns), GFP_KERNEL);
if (!id_zns) {
status = NVME_SC_INTERNAL;
goto out;
}
status = nvmet_req_find_ns(req);
if (status)
goto done;
if (nvmet_ns_revalidate(req->ns)) {
mutex_lock(&req->ns->subsys->lock);
nvmet_ns_changed(req->ns->subsys, req->ns->nsid);
mutex_unlock(&req->ns->subsys->lock);
}
if (!bdev_is_zoned(req->ns->bdev)) {
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
req->error_loc = offsetof(struct nvme_identify, nsid);
goto out;
}
zsze = (bdev_zone_sectors(req->ns->bdev) << 9) >>
req->ns->blksize_shift;
id_zns->lbafe[0].zsze = cpu_to_le64(zsze);
mor = bdev_max_open_zones(req->ns->bdev);
if (!mor)
mor = U32_MAX;
else
mor--;
id_zns->mor = cpu_to_le32(mor);
mar = bdev_max_active_zones(req->ns->bdev);
if (!mar)
mar = U32_MAX;
else
mar--;
id_zns->mar = cpu_to_le32(mar);
done:
status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns));
out:
kfree(id_zns);
nvmet_req_complete(req, status);
}
static u16 nvmet_bdev_validate_zone_mgmt_recv(struct nvmet_req *req)
{
sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba);
u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
if (sect >= get_capacity(req->ns->bdev->bd_disk)) {
req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, slba);
return NVME_SC_LBA_RANGE | NVME_SC_DNR;
}
if (out_bufsize < sizeof(struct nvme_zone_report)) {
req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, numd);
return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
}
if (req->cmd->zmr.zra != NVME_ZRA_ZONE_REPORT) {
req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, zra);
return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
}
switch (req->cmd->zmr.pr) {
case 0:
case 1:
break;
default:
req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, pr);
return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
}
switch (req->cmd->zmr.zrasf) {
case NVME_ZRASF_ZONE_REPORT_ALL:
case NVME_ZRASF_ZONE_STATE_EMPTY:
case NVME_ZRASF_ZONE_STATE_IMP_OPEN:
case NVME_ZRASF_ZONE_STATE_EXP_OPEN:
case NVME_ZRASF_ZONE_STATE_CLOSED:
case NVME_ZRASF_ZONE_STATE_FULL:
case NVME_ZRASF_ZONE_STATE_READONLY:
case NVME_ZRASF_ZONE_STATE_OFFLINE:
break;
default:
req->error_loc =
offsetof(struct nvme_zone_mgmt_recv_cmd, zrasf);
return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
}
return NVME_SC_SUCCESS;
}
struct nvmet_report_zone_data {
struct nvmet_req *req;
u64 out_buf_offset;
u64 out_nr_zones;
u64 nr_zones;
u8 zrasf;
};
static int nvmet_bdev_report_zone_cb(struct blk_zone *z, unsigned i, void *d)
{
static const unsigned int nvme_zrasf_to_blk_zcond[] = {
[NVME_ZRASF_ZONE_STATE_EMPTY] = BLK_ZONE_COND_EMPTY,
[NVME_ZRASF_ZONE_STATE_IMP_OPEN] = BLK_ZONE_COND_IMP_OPEN,
[NVME_ZRASF_ZONE_STATE_EXP_OPEN] = BLK_ZONE_COND_EXP_OPEN,
[NVME_ZRASF_ZONE_STATE_CLOSED] = BLK_ZONE_COND_CLOSED,
[NVME_ZRASF_ZONE_STATE_READONLY] = BLK_ZONE_COND_READONLY,
[NVME_ZRASF_ZONE_STATE_FULL] = BLK_ZONE_COND_FULL,
[NVME_ZRASF_ZONE_STATE_OFFLINE] = BLK_ZONE_COND_OFFLINE,
};
struct nvmet_report_zone_data *rz = d;
if (rz->zrasf != NVME_ZRASF_ZONE_REPORT_ALL &&
z->cond != nvme_zrasf_to_blk_zcond[rz->zrasf])
return 0;
if (rz->nr_zones < rz->out_nr_zones) {
struct nvme_zone_descriptor zdesc = { };
u16 status;
zdesc.zcap = nvmet_sect_to_lba(rz->req->ns, z->capacity);
zdesc.zslba = nvmet_sect_to_lba(rz->req->ns, z->start);
zdesc.wp = nvmet_sect_to_lba(rz->req->ns, z->wp);
zdesc.za = z->reset ? 1 << 2 : 0;
zdesc.zs = z->cond << 4;
zdesc.zt = z->type;
status = nvmet_copy_to_sgl(rz->req, rz->out_buf_offset, &zdesc,
sizeof(zdesc));
if (status)
return -EINVAL;
rz->out_buf_offset += sizeof(zdesc);
}
rz->nr_zones++;
return 0;
}
static unsigned long nvmet_req_nr_zones_from_slba(struct nvmet_req *req)
{
unsigned int sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba);
return bdev_nr_zones(req->ns->bdev) - bdev_zone_no(req->ns->bdev, sect);
}
static unsigned long get_nr_zones_from_buf(struct nvmet_req *req, u32 bufsize)
{
if (bufsize <= sizeof(struct nvme_zone_report))
return 0;
return (bufsize - sizeof(struct nvme_zone_report)) /
sizeof(struct nvme_zone_descriptor);
}
static void nvmet_bdev_zone_zmgmt_recv_work(struct work_struct *w)
{
struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work);
sector_t start_sect = nvmet_lba_to_sect(req->ns, req->cmd->zmr.slba);
unsigned long req_slba_nr_zones = nvmet_req_nr_zones_from_slba(req);
u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
__le64 nr_zones;
u16 status;
int ret;
struct nvmet_report_zone_data rz_data = {
.out_nr_zones = get_nr_zones_from_buf(req, out_bufsize),
/* leave the place for report zone header */
.out_buf_offset = sizeof(struct nvme_zone_report),
.zrasf = req->cmd->zmr.zrasf,
.nr_zones = 0,
.req = req,
};
status = nvmet_bdev_validate_zone_mgmt_recv(req);
if (status)
goto out;
if (!req_slba_nr_zones) {
status = NVME_SC_SUCCESS;
goto out;
}
ret = blkdev_report_zones(req->ns->bdev, start_sect, req_slba_nr_zones,
nvmet_bdev_report_zone_cb, &rz_data);
if (ret < 0) {
status = NVME_SC_INTERNAL;
goto out;
}
/*
* When partial bit is set nr_zones must indicate the number of zone
* descriptors actually transferred.
*/
if (req->cmd->zmr.pr)
rz_data.nr_zones = min(rz_data.nr_zones, rz_data.out_nr_zones);
nr_zones = cpu_to_le64(rz_data.nr_zones);
status = nvmet_copy_to_sgl(req, 0, &nr_zones, sizeof(nr_zones));
out:
nvmet_req_complete(req, status);
}
void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
{
INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zone_zmgmt_recv_work);
queue_work(zbd_wq, &req->z.zmgmt_work);
}
static inline enum req_op zsa_req_op(u8 zsa)
{
switch (zsa) {
case NVME_ZONE_OPEN:
return REQ_OP_ZONE_OPEN;
case NVME_ZONE_CLOSE:
return REQ_OP_ZONE_CLOSE;
case NVME_ZONE_FINISH:
return REQ_OP_ZONE_FINISH;
case NVME_ZONE_RESET:
return REQ_OP_ZONE_RESET;
default:
return REQ_OP_LAST;
}
}
static u16 blkdev_zone_mgmt_errno_to_nvme_status(int ret)
{
switch (ret) {
case 0:
return NVME_SC_SUCCESS;
case -EINVAL:
case -EIO:
return NVME_SC_ZONE_INVALID_TRANSITION | NVME_SC_DNR;
default:
return NVME_SC_INTERNAL;
}
}
struct nvmet_zone_mgmt_send_all_data {
unsigned long *zbitmap;
struct nvmet_req *req;
};
static int zmgmt_send_scan_cb(struct blk_zone *z, unsigned i, void *d)
{
struct nvmet_zone_mgmt_send_all_data *data = d;
switch (zsa_req_op(data->req->cmd->zms.zsa)) {
case REQ_OP_ZONE_OPEN:
switch (z->cond) {
case BLK_ZONE_COND_CLOSED:
break;
default:
return 0;
}
break;
case REQ_OP_ZONE_CLOSE:
switch (z->cond) {
case BLK_ZONE_COND_IMP_OPEN:
case BLK_ZONE_COND_EXP_OPEN:
break;
default:
return 0;
}
break;
case REQ_OP_ZONE_FINISH:
switch (z->cond) {
case BLK_ZONE_COND_IMP_OPEN:
case BLK_ZONE_COND_EXP_OPEN:
case BLK_ZONE_COND_CLOSED:
break;
default:
return 0;
}
break;
default:
return -EINVAL;
}
set_bit(i, data->zbitmap);
return 0;
}
static u16 nvmet_bdev_zone_mgmt_emulate_all(struct nvmet_req *req)
{
struct block_device *bdev = req->ns->bdev;
unsigned int nr_zones = bdev_nr_zones(bdev);
struct bio *bio = NULL;
sector_t sector = 0;
int ret;
struct nvmet_zone_mgmt_send_all_data d = {
.req = req,
};
d.zbitmap = kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(*(d.zbitmap)),
GFP_NOIO, bdev->bd_disk->node_id);
if (!d.zbitmap) {
ret = -ENOMEM;
goto out;
}
/* Scan and build bitmap of the eligible zones */
ret = blkdev_report_zones(bdev, 0, nr_zones, zmgmt_send_scan_cb, &d);
if (ret != nr_zones) {
if (ret > 0)
ret = -EIO;
goto out;
} else {
/* We scanned all the zones */
ret = 0;
}
while (sector < bdev_nr_sectors(bdev)) {
if (test_bit(disk_zone_no(bdev->bd_disk, sector), d.zbitmap)) {
bio = blk_next_bio(bio, bdev, 0,
zsa_req_op(req->cmd->zms.zsa) | REQ_SYNC,
GFP_KERNEL);
bio->bi_iter.bi_sector = sector;
/* This may take a while, so be nice to others */
cond_resched();
}
sector += bdev_zone_sectors(bdev);
}
if (bio) {
ret = submit_bio_wait(bio);
bio_put(bio);
}
out:
kfree(d.zbitmap);
return blkdev_zone_mgmt_errno_to_nvme_status(ret);
}
static u16 nvmet_bdev_execute_zmgmt_send_all(struct nvmet_req *req)
{
int ret;
switch (zsa_req_op(req->cmd->zms.zsa)) {
case REQ_OP_ZONE_RESET:
ret = blkdev_zone_mgmt(req->ns->bdev, REQ_OP_ZONE_RESET, 0,
get_capacity(req->ns->bdev->bd_disk),
GFP_KERNEL);
if (ret < 0)
return blkdev_zone_mgmt_errno_to_nvme_status(ret);
break;
case REQ_OP_ZONE_OPEN:
case REQ_OP_ZONE_CLOSE:
case REQ_OP_ZONE_FINISH:
return nvmet_bdev_zone_mgmt_emulate_all(req);
default:
/* this is needed to quiet compiler warning */
req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa);
return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
}
return NVME_SC_SUCCESS;
}
static void nvmet_bdev_zmgmt_send_work(struct work_struct *w)
{
struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work);
sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->zms.slba);
enum req_op op = zsa_req_op(req->cmd->zms.zsa);
struct block_device *bdev = req->ns->bdev;
sector_t zone_sectors = bdev_zone_sectors(bdev);
u16 status = NVME_SC_SUCCESS;
int ret;
if (op == REQ_OP_LAST) {
req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa);
status = NVME_SC_ZONE_INVALID_TRANSITION | NVME_SC_DNR;
goto out;
}
/* when select all bit is set slba field is ignored */
if (req->cmd->zms.select_all) {
status = nvmet_bdev_execute_zmgmt_send_all(req);
goto out;
}
if (sect >= get_capacity(bdev->bd_disk)) {
req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba);
status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
goto out;
}
if (sect & (zone_sectors - 1)) {
req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba);
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
goto out;
}
ret = blkdev_zone_mgmt(bdev, op, sect, zone_sectors, GFP_KERNEL);
if (ret < 0)
status = blkdev_zone_mgmt_errno_to_nvme_status(ret);
out:
nvmet_req_complete(req, status);
}
void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req)
{
INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zmgmt_send_work);
queue_work(zbd_wq, &req->z.zmgmt_work);
}
static void nvmet_bdev_zone_append_bio_done(struct bio *bio)
{
struct nvmet_req *req = bio->bi_private;
if (bio->bi_status == BLK_STS_OK) {
req->cqe->result.u64 =
nvmet_sect_to_lba(req->ns, bio->bi_iter.bi_sector);
}
nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status));
nvmet_req_bio_put(req, bio);
}
void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
{
sector_t sect = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba);
const blk_opf_t opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
u16 status = NVME_SC_SUCCESS;
unsigned int total_len = 0;
struct scatterlist *sg;
struct bio *bio;
int sg_cnt;
/* Request is completed on len mismatch in nvmet_check_transter_len() */
if (!nvmet_check_transfer_len(req, nvmet_rw_data_len(req)))
return;
if (!req->sg_cnt) {
nvmet_req_complete(req, 0);
return;
}
if (sect >= get_capacity(req->ns->bdev->bd_disk)) {
req->error_loc = offsetof(struct nvme_rw_command, slba);
status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
goto out;
}
if (sect & (bdev_zone_sectors(req->ns->bdev) - 1)) {
req->error_loc = offsetof(struct nvme_rw_command, slba);
status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
goto out;
}
if (nvmet_use_inline_bvec(req)) {
bio = &req->z.inline_bio;
bio_init(bio, req->ns->bdev, req->inline_bvec,
ARRAY_SIZE(req->inline_bvec), opf);
} else {
bio = bio_alloc(req->ns->bdev, req->sg_cnt, opf, GFP_KERNEL);
}
bio->bi_end_io = nvmet_bdev_zone_append_bio_done;
bio->bi_iter.bi_sector = sect;
bio->bi_private = req;
if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
bio->bi_opf |= REQ_FUA;
for_each_sg(req->sg, sg, req->sg_cnt, sg_cnt) {
struct page *p = sg_page(sg);
unsigned int l = sg->length;
unsigned int o = sg->offset;
unsigned int ret;
ret = bio_add_zone_append_page(bio, p, l, o);
if (ret != sg->length) {
status = NVME_SC_INTERNAL;
goto out_put_bio;
}
total_len += sg->length;
}
if (total_len != nvmet_rw_data_len(req)) {
status = NVME_SC_INTERNAL | NVME_SC_DNR;
goto out_put_bio;
}
submit_bio(bio);
return;
out_put_bio:
nvmet_req_bio_put(req, bio);
out:
nvmet_req_complete(req, status);
}
u16 nvmet_bdev_zns_parse_io_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
switch (cmd->common.opcode) {
case nvme_cmd_zone_append:
req->execute = nvmet_bdev_execute_zone_append;
return 0;
case nvme_cmd_zone_mgmt_recv:
req->execute = nvmet_bdev_execute_zone_mgmt_recv;
return 0;
case nvme_cmd_zone_mgmt_send:
req->execute = nvmet_bdev_execute_zone_mgmt_send;
return 0;
default:
return nvmet_bdev_parse_io_cmd(req);
}
}