[PATCH v3 14/20] virtio-gpu: Add initial definitions for explict flush feature

[Vivek Kasireddy <vivek.kasireddy@intel.com>]

Add the property bit, conf flag and other relevant declarations
associated with this feature.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
---
 hw/display/virtio-gpu-base.c                | 3 +++
 hw/display/virtio-gpu.c                     | 9 +++++++++
 include/hw/virtio/virtio-gpu.h              | 3 +++
 include/standard-headers/linux/virtio_gpu.h | 2 ++
 4 files changed, 17 insertions(+)

diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
index dd294276cb..c9af4c6117 100644
--- a/hw/display/virtio-gpu-base.c
+++ b/hw/display/virtio-gpu-base.c
@@ -211,6 +211,9 @@ virtio_gpu_base_get_features(VirtIODevice *vdev, uint64_t features,
     if (virtio_gpu_blob_enabled(g->conf)) {
         features |= (1 << VIRTIO_GPU_F_RESOURCE_BLOB);
     }
+    if (virtio_gpu_expflush_enabled(g->conf)) {
+        features |= (1 << VIRTIO_GPU_F_EXPLICIT_FLUSH);
+    }
 
     return features;
 }
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index cc2a0af21a..694d8f550c 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1298,6 +1298,13 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
         }
     }
 
+    if (virtio_gpu_expflush_enabled(g->parent_obj.conf)) {
+        if (!virtio_gpu_blob_enabled(g->parent_obj.conf)) {
+            error_setg(errp, "cannot enable expflush without blob resources");
+            return;
+        }
+    }
+
     if (!virtio_gpu_base_device_realize(qdev,
                                         virtio_gpu_handle_ctrl_cb,
                                         virtio_gpu_handle_cursor_cb,
@@ -1393,6 +1400,8 @@ static Property virtio_gpu_properties[] = {
                      256 * MiB),
     DEFINE_PROP_BIT("blob", VirtIOGPU, parent_obj.conf.flags,
                     VIRTIO_GPU_FLAG_BLOB_ENABLED, false),
+    DEFINE_PROP_BIT("expflush", VirtIOGPU, parent_obj.conf.flags,
+                    VIRTIO_GPU_FLAG_EXPFLUSH_ENABLED, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 31b2bcc57b..4a827454f5 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -90,6 +90,7 @@ enum virtio_gpu_base_conf_flags {
     VIRTIO_GPU_FLAG_EDID_ENABLED,
     VIRTIO_GPU_FLAG_DMABUF_ENABLED,
     VIRTIO_GPU_FLAG_BLOB_ENABLED,
+    VIRTIO_GPU_FLAG_EXPFLUSH_ENABLED,
 };
 
 #define virtio_gpu_virgl_enabled(_cfg) \
@@ -102,6 +103,8 @@ enum virtio_gpu_base_conf_flags {
     (_cfg.flags & (1 << VIRTIO_GPU_FLAG_DMABUF_ENABLED))
 #define virtio_gpu_blob_enabled(_cfg) \
     (_cfg.flags & (1 << VIRTIO_GPU_FLAG_BLOB_ENABLED))
+#define virtio_gpu_expflush_enabled(_cfg) \
+    (_cfg.flags & (1 << VIRTIO_GPU_FLAG_EXPFLUSH_ENABLED))
 
 struct virtio_gpu_base_conf {
     uint32_t max_outputs;
diff --git a/include/standard-headers/linux/virtio_gpu.h b/include/standard-headers/linux/virtio_gpu.h
index 1357e4774e..d015741f0b 100644
--- a/include/standard-headers/linux/virtio_gpu.h
+++ b/include/standard-headers/linux/virtio_gpu.h
@@ -60,6 +60,8 @@
  */
 #define VIRTIO_GPU_F_RESOURCE_BLOB       3
 
+#define VIRTIO_GPU_F_EXPLICIT_FLUSH      4
+
 enum virtio_gpu_ctrl_type {
 	VIRTIO_GPU_UNDEFINED = 0,
 
-- 
2.30.2