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Diffstat (limited to 'drivers/nvme/host/zns.c')
-rw-r--r--drivers/nvme/host/zns.c249
1 files changed, 249 insertions, 0 deletions
diff --git a/drivers/nvme/host/zns.c b/drivers/nvme/host/zns.c
new file mode 100644
index 0000000000..ec8557810c
--- /dev/null
+++ b/drivers/nvme/host/zns.c
@@ -0,0 +1,249 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Western Digital Corporation or its affiliates.
+ */
+
+#include <linux/blkdev.h>
+#include <linux/vmalloc.h>
+#include "nvme.h"
+
+int nvme_revalidate_zones(struct nvme_ns *ns)
+{
+ struct request_queue *q = ns->queue;
+
+ blk_queue_chunk_sectors(q, ns->zsze);
+ blk_queue_max_zone_append_sectors(q, ns->ctrl->max_zone_append);
+
+ return blk_revalidate_disk_zones(ns->disk, NULL);
+}
+
+static int nvme_set_max_append(struct nvme_ctrl *ctrl)
+{
+ struct nvme_command c = { };
+ struct nvme_id_ctrl_zns *id;
+ int status;
+
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id)
+ return -ENOMEM;
+
+ c.identify.opcode = nvme_admin_identify;
+ c.identify.cns = NVME_ID_CNS_CS_CTRL;
+ c.identify.csi = NVME_CSI_ZNS;
+
+ status = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
+ if (status) {
+ kfree(id);
+ return status;
+ }
+
+ if (id->zasl)
+ ctrl->max_zone_append = 1 << (id->zasl + 3);
+ else
+ ctrl->max_zone_append = ctrl->max_hw_sectors;
+ kfree(id);
+ return 0;
+}
+
+int nvme_update_zone_info(struct nvme_ns *ns, unsigned lbaf)
+{
+ struct nvme_effects_log *log = ns->head->effects;
+ struct request_queue *q = ns->queue;
+ struct nvme_command c = { };
+ struct nvme_id_ns_zns *id;
+ int status;
+
+ /* Driver requires zone append support */
+ if ((le32_to_cpu(log->iocs[nvme_cmd_zone_append]) &
+ NVME_CMD_EFFECTS_CSUPP)) {
+ if (test_and_clear_bit(NVME_NS_FORCE_RO, &ns->flags))
+ dev_warn(ns->ctrl->device,
+ "Zone Append supported for zoned namespace:%d. Remove read-only mode\n",
+ ns->head->ns_id);
+ } else {
+ set_bit(NVME_NS_FORCE_RO, &ns->flags);
+ dev_warn(ns->ctrl->device,
+ "Zone Append not supported for zoned namespace:%d. Forcing to read-only mode\n",
+ ns->head->ns_id);
+ }
+
+ /* Lazily query controller append limit for the first zoned namespace */
+ if (!ns->ctrl->max_zone_append) {
+ status = nvme_set_max_append(ns->ctrl);
+ if (status)
+ return status;
+ }
+
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id)
+ return -ENOMEM;
+
+ c.identify.opcode = nvme_admin_identify;
+ c.identify.nsid = cpu_to_le32(ns->head->ns_id);
+ c.identify.cns = NVME_ID_CNS_CS_NS;
+ c.identify.csi = NVME_CSI_ZNS;
+
+ status = nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, id, sizeof(*id));
+ if (status)
+ goto free_data;
+
+ /*
+ * We currently do not handle devices requiring any of the zoned
+ * operation characteristics.
+ */
+ if (id->zoc) {
+ dev_warn(ns->ctrl->device,
+ "zone operations:%x not supported for namespace:%u\n",
+ le16_to_cpu(id->zoc), ns->head->ns_id);
+ status = -ENODEV;
+ goto free_data;
+ }
+
+ ns->zsze = nvme_lba_to_sect(ns, le64_to_cpu(id->lbafe[lbaf].zsze));
+ if (!is_power_of_2(ns->zsze)) {
+ dev_warn(ns->ctrl->device,
+ "invalid zone size:%llu for namespace:%u\n",
+ ns->zsze, ns->head->ns_id);
+ status = -ENODEV;
+ goto free_data;
+ }
+
+ disk_set_zoned(ns->disk, BLK_ZONED_HM);
+ blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
+ disk_set_max_open_zones(ns->disk, le32_to_cpu(id->mor) + 1);
+ disk_set_max_active_zones(ns->disk, le32_to_cpu(id->mar) + 1);
+free_data:
+ kfree(id);
+ return status;
+}
+
+static void *nvme_zns_alloc_report_buffer(struct nvme_ns *ns,
+ unsigned int nr_zones, size_t *buflen)
+{
+ struct request_queue *q = ns->disk->queue;
+ size_t bufsize;
+ void *buf;
+
+ const size_t min_bufsize = sizeof(struct nvme_zone_report) +
+ sizeof(struct nvme_zone_descriptor);
+
+ nr_zones = min_t(unsigned int, nr_zones,
+ get_capacity(ns->disk) >> ilog2(ns->zsze));
+
+ bufsize = sizeof(struct nvme_zone_report) +
+ nr_zones * sizeof(struct nvme_zone_descriptor);
+ bufsize = min_t(size_t, bufsize,
+ queue_max_hw_sectors(q) << SECTOR_SHIFT);
+ bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
+
+ while (bufsize >= min_bufsize) {
+ buf = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
+ if (buf) {
+ *buflen = bufsize;
+ return buf;
+ }
+ bufsize >>= 1;
+ }
+ return NULL;
+}
+
+static int nvme_zone_parse_entry(struct nvme_ns *ns,
+ struct nvme_zone_descriptor *entry,
+ unsigned int idx, report_zones_cb cb,
+ void *data)
+{
+ struct blk_zone zone = { };
+
+ if ((entry->zt & 0xf) != NVME_ZONE_TYPE_SEQWRITE_REQ) {
+ dev_err(ns->ctrl->device, "invalid zone type %#x\n",
+ entry->zt);
+ return -EINVAL;
+ }
+
+ zone.type = BLK_ZONE_TYPE_SEQWRITE_REQ;
+ zone.cond = entry->zs >> 4;
+ zone.len = ns->zsze;
+ zone.capacity = nvme_lba_to_sect(ns, le64_to_cpu(entry->zcap));
+ zone.start = nvme_lba_to_sect(ns, le64_to_cpu(entry->zslba));
+ if (zone.cond == BLK_ZONE_COND_FULL)
+ zone.wp = zone.start + zone.len;
+ else
+ zone.wp = nvme_lba_to_sect(ns, le64_to_cpu(entry->wp));
+
+ return cb(&zone, idx, data);
+}
+
+int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
+ unsigned int nr_zones, report_zones_cb cb, void *data)
+{
+ struct nvme_zone_report *report;
+ struct nvme_command c = { };
+ int ret, zone_idx = 0;
+ unsigned int nz, i;
+ size_t buflen;
+
+ if (ns->head->ids.csi != NVME_CSI_ZNS)
+ return -EINVAL;
+
+ report = nvme_zns_alloc_report_buffer(ns, nr_zones, &buflen);
+ if (!report)
+ return -ENOMEM;
+
+ c.zmr.opcode = nvme_cmd_zone_mgmt_recv;
+ c.zmr.nsid = cpu_to_le32(ns->head->ns_id);
+ c.zmr.numd = cpu_to_le32(nvme_bytes_to_numd(buflen));
+ c.zmr.zra = NVME_ZRA_ZONE_REPORT;
+ c.zmr.zrasf = NVME_ZRASF_ZONE_REPORT_ALL;
+ c.zmr.pr = NVME_REPORT_ZONE_PARTIAL;
+
+ sector &= ~(ns->zsze - 1);
+ while (zone_idx < nr_zones && sector < get_capacity(ns->disk)) {
+ memset(report, 0, buflen);
+
+ c.zmr.slba = cpu_to_le64(nvme_sect_to_lba(ns, sector));
+ ret = nvme_submit_sync_cmd(ns->queue, &c, report, buflen);
+ if (ret) {
+ if (ret > 0)
+ ret = -EIO;
+ goto out_free;
+ }
+
+ nz = min((unsigned int)le64_to_cpu(report->nr_zones), nr_zones);
+ if (!nz)
+ break;
+
+ for (i = 0; i < nz && zone_idx < nr_zones; i++) {
+ ret = nvme_zone_parse_entry(ns, &report->entries[i],
+ zone_idx, cb, data);
+ if (ret)
+ goto out_free;
+ zone_idx++;
+ }
+
+ sector += ns->zsze * nz;
+ }
+
+ if (zone_idx > 0)
+ ret = zone_idx;
+ else
+ ret = -EINVAL;
+out_free:
+ kvfree(report);
+ return ret;
+}
+
+blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *c, enum nvme_zone_mgmt_action action)
+{
+ memset(c, 0, sizeof(*c));
+
+ c->zms.opcode = nvme_cmd_zone_mgmt_send;
+ c->zms.nsid = cpu_to_le32(ns->head->ns_id);
+ c->zms.slba = cpu_to_le64(nvme_sect_to_lba(ns, blk_rq_pos(req)));
+ c->zms.zsa = action;
+
+ if (req_op(req) == REQ_OP_ZONE_RESET_ALL)
+ c->zms.select_all = 1;
+
+ return BLK_STS_OK;
+}