hw/block/nvme: Support Zone Descriptor Extensions

Zone Descriptor Extension is a label that can be assigned to a zone.
It can be set to an Empty zone and it stays assigned until the zone
is reset.

This commit adds a new optional module property,
"zoned.descr_ext_size". Its value must be a multiple of 64 bytes.
If this value is non-zero, it becomes possible to assign extensions
of that size to any Empty zones. The default value for this property
is 0, therefore setting extensions is disabled by default.

Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com>
Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Reviewed-by: Niklas Cassel <Niklas.Cassel@wdc.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/hw/block/nvme-ns.h b/hw/block/nvme-ns.h
index 7e1fd26909..f8f3c28c36 100644
--- a/hw/block/nvme-ns.h
+++ b/hw/block/nvme-ns.h
@@ -35,6 +35,7 @@ typedef struct NvmeNamespaceParams {
     uint64_t zone_cap_bs;
     uint32_t max_active_zones;
     uint32_t max_open_zones;
+    uint32_t zd_extension_size;
 } NvmeNamespaceParams;
 
 typedef struct NvmeNamespace {
@@ -56,6 +57,7 @@ typedef struct NvmeNamespace {
     uint64_t        zone_size;
     uint64_t        zone_capacity;
     uint32_t        zone_size_log2;
+    uint8_t         *zd_extensions;
     int32_t         nr_open_zones;
     int32_t         nr_active_zones;
 
@@ -129,6 +131,12 @@ static inline bool nvme_wp_is_valid(NvmeZone *zone)
            st != NVME_ZONE_STATE_OFFLINE;
 }
 
+static inline uint8_t *nvme_get_zd_extension(NvmeNamespace *ns,
+                                             uint32_t zone_idx)
+{
+    return &ns->zd_extensions[zone_idx * ns->params.zd_extension_size];
+}
+
 static inline void nvme_aor_inc_open(NvmeNamespace *ns)
 {
     assert(ns->nr_open_zones >= 0);