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path: root/drivers/nvme/target/zns.c
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Diffstat (limited to 'drivers/nvme/target/zns.c')
-rw-r--r--drivers/nvme/target/zns.c615
1 files changed, 615 insertions, 0 deletions
diff --git a/drivers/nvme/target/zns.c b/drivers/nvme/target/zns.c
new file mode 100644
index 000000000000..17f8b7a45f21
--- /dev/null
+++ b/drivers/nvme/target/zns.c
@@ -0,0 +1,615 @@
+// 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)
+{
+ struct request_queue *q = ns->bdev->bd_disk->queue;
+ u8 zasl = nvmet_zasl(queue_max_zone_append_sectors(q));
+ 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->queue->conv_zones_bitmap)
+ return false;
+
+ ret = blkdev_report_zones(ns->bdev, 0, blkdev_nr_zones(bd_disk),
+ 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_cns_cs_ctrl(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_cns_cs_ns(struct nvmet_req *req)
+{
+ struct nvme_id_ns_zns *id_zns;
+ u64 zsze;
+ u16 status;
+
+ 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) {
+ status = NVME_SC_INTERNAL;
+ goto done;
+ }
+
+ if (!bdev_is_zoned(req->ns->bdev)) {
+ req->error_loc = offsetof(struct nvme_identify, nsid);
+ status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+ goto done;
+ }
+
+ nvmet_ns_revalidate(req->ns);
+ zsze = (bdev_zone_sectors(req->ns->bdev) << 9) >>
+ req->ns->blksize_shift;
+ id_zns->lbafe[0].zsze = cpu_to_le64(zsze);
+ id_zns->mor = cpu_to_le32(bdev_max_open_zones(req->ns->bdev));
+ id_zns->mar = cpu_to_le32(bdev_max_active_zones(req->ns->bdev));
+
+done:
+ status = nvmet_copy_to_sgl(req, 0, id_zns, sizeof(*id_zns));
+ kfree(id_zns);
+out:
+ 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 blkdev_nr_zones(req->ns->bdev->bd_disk) -
+ (sect >> ilog2(bdev_zone_sectors(req->ns->bdev)));
+}
+
+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_opf 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 = blkdev_nr_zones(bdev->bd_disk);
+ struct request_queue *q = bdev_get_queue(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, q->node);
+ 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 < get_capacity(bdev->bd_disk)) {
+ if (test_bit(blk_queue_zone_no(q, sector), d.zbitmap)) {
+ bio = blk_next_bio(bio, 0, GFP_KERNEL);
+ bio->bi_opf = zsa_req_op(req->cmd->zms.zsa) | REQ_SYNC;
+ bio->bi_iter.bi_sector = sector;
+ bio_set_dev(bio, bdev);
+ /* This may take a while, so be nice to others */
+ cond_resched();
+ }
+ sector += blk_queue_zone_sectors(q);
+ }
+
+ 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_opf 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);
+ 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->inline_bvec, ARRAY_SIZE(req->inline_bvec));
+ } else {
+ bio = bio_alloc(GFP_KERNEL, req->sg_cnt);
+ }
+
+ bio->bi_opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
+ bio->bi_end_io = nvmet_bdev_zone_append_bio_done;
+ bio_set_dev(bio, req->ns->bdev);
+ 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);
+ }
+}