[PATCH v2 12/18] hw/block/nvme: Simulate Zone Active excursions

[Dmitry Fomichev]

Added a Boolean flag to turn on simulation of Zone Active Excursions.
If the flag, "active_excursions", is set to true, the driver will try
to finish one of the currently open zone if max active zones limit is
going to get exceeded.

Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
---
 hw/block/nvme.c | 24 +++++++++++++++++++++++-
 hw/block/nvme.h |  1 +
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 05a7cbcfcc..a29cbfcc96 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -540,6 +540,26 @@ static void nvme_auto_transition_zone(NvmeCtrl *n, 
NvmeNamespace *ns,
 {
     NvmeZone *zone;
 
+    if (n->params.active_excursions && adding_active &&
+        n->params.max_active_zones &&
+        ns->nr_active_zones == n->params.max_active_zones) {
+        zone = nvme_peek_zone_head(ns, ns->closed_zones);
+        if (zone) {
+            /*
+             * The namespace is at the limit of active zones.
+             * Try to finish one of the currently active zones
+             * to make the needed active zone resource available.
+             */
+            nvme_aor_dec_active(n, ns);
+            nvme_assign_zone_state(n, ns, zone, NVME_ZONE_STATE_FULL);
+            zone->d.za &= ~(NVME_ZA_FINISH_RECOMMENDED |
+                            NVME_ZA_RESET_RECOMMENDED);
+            zone->d.za |= NVME_ZA_FINISHED_BY_CTLR;
+            zone->tstamp = 0;
+            trace_pci_nvme_zone_finished_by_controller(zone->d.zslba);
+        }
+    }
+
     if (implicit && n->params.max_open_zones &&
         ns->nr_open_zones == n->params.max_open_zones) {
         zone = nvme_remove_zone_head(n, ns, ns->imp_open_zones);
@@ -2631,7 +2651,7 @@ static int nvme_zoned_init_ns(NvmeCtrl *n, NvmeNamespace 
*ns, int lba_index,
     /* MAR/MOR are zeroes-based, 0xffffffff means no limit */
     ns->id_ns_zoned->mar = cpu_to_le32(n->params.max_active_zones - 1);
     ns->id_ns_zoned->mor = cpu_to_le32(n->params.max_open_zones - 1);
-    ns->id_ns_zoned->zoc = 0;
+    ns->id_ns_zoned->zoc = cpu_to_le16(n->params.active_excursions ? 0x2 : 0);
     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);
@@ -2993,6 +3013,8 @@ static Property nvme_props[] = {
     DEFINE_PROP_INT32("max_active", NvmeCtrl, params.max_active_zones, 0),
     DEFINE_PROP_INT32("max_open", NvmeCtrl, params.max_open_zones, 0),
     DEFINE_PROP_BOOL("cross_zone_read", NvmeCtrl, params.cross_zone_read, 
true),
+    DEFINE_PROP_BOOL("active_excursions", NvmeCtrl, params.active_excursions,
+                     false),
     DEFINE_PROP_UINT8("fill_pattern", NvmeCtrl, params.fill_pattern, 0),
     DEFINE_PROP_END_OF_LIST(),
 };
diff --git a/hw/block/nvme.h b/hw/block/nvme.h
index f5a4679702..8a0aaeb09a 100644
--- a/hw/block/nvme.h
+++ b/hw/block/nvme.h
@@ -15,6 +15,7 @@ typedef struct NvmeParams {
 
     bool        zoned;
     bool        cross_zone_read;
+    bool        active_excursions;
     uint8_t     fill_pattern;
     uint32_t    zamds_bs;
     uint64_t    zone_size;
-- 
2.21.0