[PATCH v2 15/18] hw/block/nvme: Support Zone Descriptor Extensions

[Dmitry Fomichev]

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 property, "zone_descr_ext_size", to
the driver. 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>
---
 hw/block/nvme.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++---
 hw/block/nvme.h |  8 ++++++
 2 files changed, 80 insertions(+), 4 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index b9135a6b1f..eb41081627 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -1360,6 +1360,26 @@ static bool nvme_cond_offline_all(uint8_t state)
     return state == NVME_ZONE_STATE_READ_ONLY;
 }
 
+static uint16_t nvme_set_zd_ext(NvmeCtrl *n, NvmeNamespace *ns,
+    NvmeZone *zone, uint8_t state)
+{
+    uint16_t status;
+
+    if (state == NVME_ZONE_STATE_EMPTY) {
+        nvme_auto_transition_zone(n, ns, false, true);
+        status = nvme_aor_check(n, ns, 1, 0);
+        if (status != NVME_SUCCESS) {
+            return status;
+        }
+        nvme_aor_inc_active(n, ns);
+        zone->d.za |= NVME_ZA_ZD_EXT_VALID;
+        nvme_assign_zone_state(n, ns, zone, NVME_ZONE_STATE_CLOSED);
+        return NVME_SUCCESS;
+    }
+
+    return NVME_ZONE_INVAL_TRANSITION;
+}
+
 static uint16_t name_do_zone_op(NvmeCtrl *n, NvmeNamespace *ns,
     NvmeZone *zone, uint8_t state, bool all,
     uint16_t (*op_hndlr)(NvmeCtrl *, NvmeNamespace *, NvmeZone *,
@@ -1388,13 +1408,16 @@ static uint16_t name_do_zone_op(NvmeCtrl *n, 
NvmeNamespace *ns,
 static uint16_t nvme_zone_mgmt_send(NvmeCtrl *n, NvmeNamespace *ns,
     NvmeCmd *cmd, NvmeRequest *req)
 {
+    NvmeRwCmd *rw;
     uint32_t dw13 = le32_to_cpu(cmd->cdw13);
+    uint64_t prp1, prp2;
     uint64_t slba = 0;
     uint64_t zone_idx = 0;
     uint16_t status;
     uint8_t action, state;
     bool all;
     NvmeZone *zone;
+    uint8_t *zd_ext;
 
     action = dw13 & 0xff;
     all = dw13 & 0x100;
@@ -1449,7 +1472,25 @@ static uint16_t nvme_zone_mgmt_send(NvmeCtrl *n, 
NvmeNamespace *ns,
 
     case NVME_ZONE_ACTION_SET_ZD_EXT:
         trace_pci_nvme_set_descriptor_extension(slba, zone_idx);
-        return NVME_INVALID_FIELD | NVME_DNR;
+        if (all || !n->params.zd_extension_size) {
+            return NVME_INVALID_FIELD | NVME_DNR;
+        }
+        zd_ext = nvme_get_zd_extension(n, ns, zone_idx);
+        rw = (NvmeRwCmd *)cmd;
+        prp1 = le64_to_cpu(rw->prp1);
+        prp2 = le64_to_cpu(rw->prp2);
+        status = nvme_dma_write_prp(n, zd_ext, n->params.zd_extension_size,
+                                    prp1, prp2);
+        if (status) {
+            trace_pci_nvme_err_zd_extension_map_error(zone_idx);
+            return status;
+        }
+
+        status = nvme_set_zd_ext(n, ns, zone, state);
+        if (status == NVME_SUCCESS) {
+            trace_pci_nvme_zd_extension_set(zone_idx);
+            return status;
+        }
         break;
 
     default:
@@ -1528,7 +1569,7 @@ static uint16_t nvme_zone_mgmt_recv(NvmeCtrl *n, 
NvmeNamespace *ns,
         return NVME_INVALID_FIELD | NVME_DNR;
     }
 
-    if (zra == NVME_ZONE_REPORT_EXTENDED) {
+    if (zra == NVME_ZONE_REPORT_EXTENDED && !n->params.zd_extension_size) {
         return NVME_INVALID_FIELD | NVME_DNR;
     }
 
@@ -1540,6 +1581,9 @@ static uint16_t nvme_zone_mgmt_recv(NvmeCtrl *n, 
NvmeNamespace *ns,
     partial = (dw13 >> 16) & 0x01;
 
     zone_entry_sz = sizeof(NvmeZoneDescr);
+    if (zra == NVME_ZONE_REPORT_EXTENDED) {
+        zone_entry_sz += n->params.zd_extension_size;
+    }
 
     max_zones = (len - sizeof(NvmeZoneReportHeader)) / zone_entry_sz;
     buf = g_malloc0(len);
@@ -1571,6 +1615,14 @@ static uint16_t nvme_zone_mgmt_recv(NvmeCtrl *n, 
NvmeNamespace *ns,
             z->wp = cpu_to_le64(~0ULL);
         }
 
+        if (zra == NVME_ZONE_REPORT_EXTENDED) {
+            if (zs->d.za & NVME_ZA_ZD_EXT_VALID) {
+                memcpy(buf_p, nvme_get_zd_extension(n, ns, zone_index),
+                       n->params.zd_extension_size);
+            }
+            buf_p += n->params.zd_extension_size;
+        }
+
         zone_index++;
     }
 
@@ -2337,7 +2389,7 @@ static uint16_t nvme_handle_changed_zone_log(NvmeCtrl *n, 
NvmeCmd *cmd,
             continue;
         }
         num_aen_zones++;
-        if (zone->d.za) {
+        if (zone->d.za & ~NVME_ZA_ZD_EXT_VALID) {
             trace_pci_nvme_reporting_changed_zone(zone->d.zslba, zone->d.za);
             *zid_ptr++ = cpu_to_le64(zone->d.zslba);
             nids++;
@@ -2936,6 +2988,7 @@ static int nvme_init_zone_meta(NvmeCtrl *n, NvmeNamespace 
*ns,
     ns->imp_open_zones = g_malloc0(sizeof(NvmeZoneList));
     ns->closed_zones = g_malloc0(sizeof(NvmeZoneList));
     ns->full_zones = g_malloc0(sizeof(NvmeZoneList));
+    ns->zd_extensions = g_malloc0(n->params.zd_extension_size * n->num_zones);
     zone = ns->zone_array;
 
     nvme_init_zone_list(ns->exp_open_zones);
@@ -3010,6 +3063,17 @@ static void nvme_zoned_init_ctrl(NvmeCtrl *n, Error 
**errp)
     if (n->params.max_active_zones > nz) {
         n->params.max_active_zones = nz;
     }
+    if (n->params.zd_extension_size) {
+        if (n->params.zd_extension_size & 0x3f) {
+            error_setg(errp,
+                "zone descriptor extension size must be a multiple of 64B");
+            return;
+        }
+        if ((n->params.zd_extension_size >> 6) > 0xff) {
+            error_setg(errp, "zone descriptor extension size is too large");
+            return;
+        }
+    }
 
     if (n->params.zone_async_events) {
         n->ae_cfg |= NVME_AEN_CFG_ZONE_DESCR_CHNGD_NOTICES;
@@ -3040,7 +3104,8 @@ static int nvme_zoned_init_ns(NvmeCtrl *n, NvmeNamespace 
*ns, int lba_index,
     ns->id_ns_zoned->ozcs = n->params.cross_zone_read ? 0x01 : 0x00;
 
     ns->id_ns_zoned->lbafe[lba_index].zsze = cpu_to_le64(n->params.zone_size);
-    ns->id_ns_zoned->lbafe[lba_index].zdes = 0;
+    ns->id_ns_zoned->lbafe[lba_index].zdes =
+        n->params.zd_extension_size >> 6; /* Units of 64B */
 
     if (n->params.fill_pattern == 0) {
         ns->id_ns.dlfeat = 0x01;
@@ -3063,6 +3128,7 @@ static void nvme_zoned_clear(NvmeCtrl *n)
         g_free(ns->imp_open_zones);
         g_free(ns->closed_zones);
         g_free(ns->full_zones);
+        g_free(ns->zd_extensions);
     }
 }
 
@@ -3396,6 +3462,8 @@ static Property nvme_props[] = {
     DEFINE_PROP_UINT64("zone_size", NvmeCtrl, params.zone_size, 512),
     DEFINE_PROP_UINT64("zone_capacity", NvmeCtrl, params.zone_capacity, 512),
     DEFINE_PROP_UINT32("zone_append_max_size", NvmeCtrl, params.zamds_bs, 0),
+    DEFINE_PROP_UINT32("zone_descr_ext_size", NvmeCtrl,
+                       params.zd_extension_size, 0),
     DEFINE_PROP_INT32("max_active", NvmeCtrl, params.max_active_zones, 0),
     DEFINE_PROP_INT32("max_open", NvmeCtrl, params.max_open_zones, 0),
     DEFINE_PROP_UINT64("reset_rcmnd_delay", NvmeCtrl, params.rzr_delay_usec, 
0),
diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index e63f7736d7..4251295917 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -24,6 +24,7 @@ typedef struct NvmeParams {
     uint64_t    zone_capacity;
     int32_t     max_active_zones;
     int32_t     max_open_zones;
+    uint32_t    zd_extension_size;
     uint64_t    rzr_delay_usec;
     uint64_t    rrl_usec;
     uint64_t    fzr_delay_usec;
@@ -123,6 +124,7 @@ typedef struct NvmeNamespace {
     NvmeZoneList    *imp_open_zones;
     NvmeZoneList    *closed_zones;
     NvmeZoneList    *full_zones;
+    uint8_t         *zd_extensions;
     int32_t         nr_open_zones;
     int32_t         nr_active_zones;
     bool            aen_pending;
@@ -221,6 +223,12 @@ static inline bool nvme_wp_is_valid(NvmeZone *zone)
            st != NVME_ZONE_STATE_OFFLINE;
 }
 
+static inline uint8_t *nvme_get_zd_extension(NvmeCtrl *n,
+    NvmeNamespace *ns, uint32_t zone_idx)
+{
+    return &ns->zd_extensions[zone_idx * n->params.zd_extension_size];
+}
+
 /*
  * Initialize a zone list head.
  */
-- 
2.21.0