[PATCH v2 1/1] virgl: Implement resource_query_layout

[Julia Zhang <julia.zhang@amd.com>]

From: Daniel Stone <daniels@collabora.com>

A new ioctl to shuttle information between host and guest about the
actual buffer allocation, which can be used for interop between GL and
Vulkan when supporting standard window systems.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Co-developed-by: Julia Zhang <julia.zhang@amd.com>
Signed-off-by: Julia Zhang <julia.zhang@amd.com>
---
 hw/display/virtio-gpu-base.c                |  4 +++
 hw/display/virtio-gpu-virgl.c               | 40 +++++++++++++++++++++
 include/hw/virtio/virtio-gpu-bswap.h        |  7 ++++
 include/standard-headers/linux/virtio_gpu.h | 30 ++++++++++++++++
 meson.build                                 |  4 +++
 5 files changed, 85 insertions(+)

diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
index 6bcee3882f..09b37f015d 100644
--- a/hw/display/virtio-gpu-base.c
+++ b/hw/display/virtio-gpu-base.c
@@ -240,6 +240,10 @@ virtio_gpu_base_get_features(VirtIODevice *vdev, uint64_t features,
         features |= (1 << VIRTIO_GPU_F_RESOURCE_UUID);
     }
 
+#ifdef HAVE_VIRGL_RESOURCE_QUERY_LAYOUT
+    features |= (1 << VIRTIO_GPU_F_RESOURCE_QUERY_LAYOUT);
+#endif /* HAVE_VIRGL_RESOURCE_QUERY_LAYOUT */
+
     return features;
 }
 
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index c1e7c6d0c6..b331232fee 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -813,6 +813,40 @@ static void virgl_cmd_set_scanout_blob(VirtIOGPU *g,
 
 #endif /* HAVE_VIRGL_RESOURCE_BLOB */
 
+#ifdef HAVE_VIRGL_RESOURCE_QUERY_LAYOUT
+static void virgl_cmd_resource_query_layout(VirtIOGPU *g,
+					    struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virtio_gpu_resource_query_layout qlayout;
+    struct virtio_gpu_resp_resource_layout resp;
+    struct virgl_renderer_resource_layout rlayout;
+    int ret;
+    int i;
+    VIRTIO_GPU_FILL_CMD(qlayout);
+    virtio_gpu_resource_query_layout_bswap(&qlayout);
+
+    ret = virgl_renderer_resource_query_layout(qlayout.resource_id, &rlayout,
+					       qlayout.width, qlayout.height,
+					       qlayout.format, qlayout.bind);
+    if (ret != 0) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource %d is not externally-allocated\n",
+                      __func__, qlayout.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    memset(&resp, 0, sizeof(resp));
+    resp.hdr.type = VIRTIO_GPU_RESP_OK_RESOURCE_LAYOUT;
+    resp.num_planes = rlayout.num_planes;
+    resp.modifier = rlayout.modifier;
+    for (i = 0; i < resp.num_planes; i++) {
+        resp.planes[i].offset = rlayout.planes[i].offset;
+        resp.planes[i].stride = rlayout.planes[i].stride;
+    }
+    virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp));
+}
+#endif /* HAVE_VIRGL_RESOURCE_QUERY_LAYOUT */
+
 void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
                                       struct virtio_gpu_ctrl_command *cmd)
 {
@@ -896,6 +930,12 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
         virgl_cmd_set_scanout_blob(g, cmd);
         break;
 #endif /* HAVE_VIRGL_RESOURCE_BLOB */
+
+#ifdef HAVE_VIRGL_RESOURCE_QUERY_LAYOUT
+    case VIRTIO_GPU_CMD_RESOURCE_QUERY_LAYOUT:
+	virgl_cmd_resource_query_layout(g, cmd);
+	break;
+#endif /* HAVE_VIRGL_RESOURCE_QUERY_LAYOUT*/
     default:
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         break;
diff --git a/include/hw/virtio/virtio-gpu-bswap.h b/include/hw/virtio/virtio-gpu-bswap.h
index dd1975e2d4..dea8cf6fd3 100644
--- a/include/hw/virtio/virtio-gpu-bswap.h
+++ b/include/hw/virtio/virtio-gpu-bswap.h
@@ -92,4 +92,11 @@ virtio_gpu_scanout_blob_bswap(struct virtio_gpu_set_scanout_blob *ssb)
     le32_to_cpus(&ssb->offsets[3]);
 }
 
+static inline void
+virtio_gpu_resource_query_layout_bswap(struct virtio_gpu_resource_query_layout *rql)
+{
+    virtio_gpu_ctrl_hdr_bswap(&rql->hdr);
+    le32_to_cpus(&rql->resource_id);
+}
+
 #endif
diff --git a/include/standard-headers/linux/virtio_gpu.h b/include/standard-headers/linux/virtio_gpu.h
index c621389f3d..c9a2f58237 100644
--- a/include/standard-headers/linux/virtio_gpu.h
+++ b/include/standard-headers/linux/virtio_gpu.h
@@ -65,6 +65,11 @@
  */
 #define VIRTIO_GPU_F_CONTEXT_INIT        4
 
+/*
+ * VIRTIO_GPU_CMD_RESOURCE_QUERY_LAYOUT
+ */
+#define VIRTIO_GPU_F_RESOURCE_QUERY_LAYOUT 5
+
 enum virtio_gpu_ctrl_type {
 	VIRTIO_GPU_UNDEFINED = 0,
 
@@ -95,6 +100,7 @@ enum virtio_gpu_ctrl_type {
 	VIRTIO_GPU_CMD_SUBMIT_3D,
 	VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB,
 	VIRTIO_GPU_CMD_RESOURCE_UNMAP_BLOB,
+	VIRTIO_GPU_CMD_RESOURCE_QUERY_LAYOUT,
 
 	/* cursor commands */
 	VIRTIO_GPU_CMD_UPDATE_CURSOR = 0x0300,
@@ -108,6 +114,7 @@ enum virtio_gpu_ctrl_type {
 	VIRTIO_GPU_RESP_OK_EDID,
 	VIRTIO_GPU_RESP_OK_RESOURCE_UUID,
 	VIRTIO_GPU_RESP_OK_MAP_INFO,
+	VIRTIO_GPU_RESP_OK_RESOURCE_LAYOUT,
 
 	/* error responses */
 	VIRTIO_GPU_RESP_ERR_UNSPEC = 0x1200,
@@ -455,4 +462,27 @@ struct virtio_gpu_resource_unmap_blob {
 	uint32_t padding;
 };
 
+
+/* VIRTIO_GPU_CMD_RESOURCE_QUERY_LAYOUT */
+struct virtio_gpu_resource_query_layout {
+	struct virtio_gpu_ctrl_hdr hdr;
+	uint32_t resource_id;
+	uint32_t width;
+	uint32_t height;
+	uint32_t format;
+	uint32_t bind;
+};
+
+/* VIRTIO_GPU_RESP_OK_RESOURCE_LAYOUT */
+#define VIRTIO_GPU_RES_MAX_PLANES 4
+struct virtio_gpu_resp_resource_layout {
+	struct virtio_gpu_ctrl_hdr hdr;
+	uint64_t modifier;
+	uint32_t num_planes;
+	struct virtio_gpu_resource_plane {
+		uint64_t offset;
+		uint32_t stride;
+	} planes[VIRTIO_GPU_RES_MAX_PLANES];
+};
+
 #endif
diff --git a/meson.build b/meson.build
index a739a62f2c..72024f5f01 100644
--- a/meson.build
+++ b/meson.build
@@ -1058,6 +1058,10 @@ if not get_option('virglrenderer').auto() or have_system or have_vhost_user_gpu
                          cc.has_function('virgl_renderer_resource_create_blob',
                                          prefix: '#include <virglrenderer.h>',
                                          dependencies: virgl))
+    config_host_data.set('HAVE_VIRGL_RESOURCE_QUERY_LAYOUT',
+                         cc.has_function('virgl_renderer_resource_query_layout',
+                                         prefix: '#include <virglrenderer.h>',
+                                         dependencies: virgl))
   endif
 endif
 rutabaga = not_found
-- 
2.34.1