[RFC PATCH V3 8/8] hw/block/nvme: Add Identify Active Namespace ID List

[Minwoo Im <minwoo.im.dev@gmail.com>]

Spec v1.4b 6.1.4 "Active and Inactive NSID Types" says:

"Active NSIDs for a controller refer to namespaces that are attached to
that controller. Allocated NSIDs that are inactive for a controller refer
to namespaces that are not attached to that controller."

This patch introduced for Identify Active Namespace ID List (CNS 02h).

Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
---
 hw/block/nvme.c | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 2b2c07b36c2b..7247167b0ee6 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -2883,6 +2883,39 @@ static uint16_t nvme_identify_ns_csi(NvmeCtrl *n, NvmeRequest *req)
     return NVME_INVALID_FIELD | NVME_DNR;
 }
 
+static uint16_t nvme_identify_nslist_active(NvmeCtrl *n, NvmeRequest *req)
+{
+    NvmeNamespace *ns;
+    NvmeIdentify *c = (NvmeIdentify *)&req->cmd;
+    uint32_t min_nsid = le32_to_cpu(c->nsid);
+    uint8_t list[NVME_IDENTIFY_DATA_SIZE] = {};
+    static const int data_len = sizeof(list);
+    uint32_t *list_ptr = (uint32_t *)list;
+    int i, j = 0;
+
+    if (min_nsid >= NVME_NSID_BROADCAST - 1) {
+        return NVME_INVALID_NSID | NVME_DNR;
+    }
+
+    for (i = 1; i <= n->num_namespaces; i++) {
+        ns = nvme_ns(n, i);
+        if (!ns || ns->params.nsid <= min_nsid) {
+            continue;
+        }
+
+        if (!nvme_ns_is_attached(n, ns)) {
+            continue;
+        }
+
+        list_ptr[j++] = cpu_to_le32(ns->params.nsid);
+        if (j == data_len / sizeof(uint32_t)) {
+            break;
+        }
+    }
+
+    return nvme_dma(n, list, data_len, DMA_DIRECTION_FROM_DEVICE, req);
+}
+
 static uint16_t nvme_identify_nslist(NvmeCtrl *n, NvmeRequest *req)
 {
     NvmeNamespace *ns;
@@ -2914,10 +2947,6 @@ static uint16_t nvme_identify_nslist(NvmeCtrl *n, NvmeRequest *req)
             continue;
         }
 
-        if (!nvme_ns_is_attached(n, ns)) {
-            continue;
-        }
-
         list_ptr[j++] = cpu_to_le32(ns->params.nsid);
         if (j == data_len / sizeof(uint32_t)) {
             break;
@@ -3045,7 +3074,7 @@ static uint16_t nvme_identify(NvmeCtrl *n, NvmeRequest *req)
     case NVME_ID_CNS_CS_CTRL:
         return nvme_identify_ctrl_csi(n, req);
     case NVME_ID_CNS_NS_ACTIVE_LIST:
-         /* fall through */
+         return nvme_identify_nslist_active(n, req);
     case NVME_ID_CNS_NS_PRESENT_LIST:
         return nvme_identify_nslist(n, req);
     case NVME_ID_CNS_CS_NS_ACTIVE_LIST:
-- 
2.17.1