virtio-gpu-3d: add support for second capability set (v4)

Due to a kernel bug we can never increase the size of capability
set 1, so introduce a new capability set in parallel, old userspace
will continue to use the old set, new userspace will start using
the new one when it detects a fixed kernel.

v2: don't use a define from virglrenderer, just probe it.
v3: fix compilation when virglrenderer disabled
v4: fix style warning, just use ?: op instead.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Message-id: 20180223023814.24459-1-airlied@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/display/virtio-gpu-3d.c

@@ -362,6 +362,11 @@ static void virgl_cmd_get_capset_info(VirtIOGPU *g,
         virgl_renderer_get_cap_set(resp.capset_id,
                                    &resp.capset_max_version,
                                    &resp.capset_max_size);
+    } else if (info.capset_index == 1) {
+        resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL2;
+        virgl_renderer_get_cap_set(resp.capset_id,
+                                   &resp.capset_max_version,
+                                   &resp.capset_max_size);
     } else {
         resp.capset_max_version = 0;
         resp.capset_max_size = 0;
@@ -635,4 +640,14 @@ int virtio_gpu_virgl_init(VirtIOGPU *g)
     return 0;
 }
 
+int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
+{
+    uint32_t capset2_max_ver, capset2_max_size;
+    virgl_renderer_get_cap_set(VIRTIO_GPU_CAPSET_VIRGL2,
+                              &capset2_max_ver,
+                              &capset2_max_size);
+
+    return capset2_max_ver ? 2 : 1;
+}
+
 #endif /* CONFIG_VIRGL */

hw/display/virtio-gpu.c

@@ -1215,7 +1215,12 @@ static void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
         /* use larger control queue in 3d mode */
         g->ctrl_vq   = virtio_add_queue(vdev, 256, virtio_gpu_handle_ctrl_cb);
         g->cursor_vq = virtio_add_queue(vdev, 16, virtio_gpu_handle_cursor_cb);
-        g->virtio_config.num_capsets = 1;
+
+#if defined(CONFIG_VIRGL)
+        g->virtio_config.num_capsets = virtio_gpu_virgl_get_num_capsets(g);
+#else
+        g->virtio_config.num_capsets = 0;
+#endif
     } else {
         g->ctrl_vq   = virtio_add_queue(vdev, 64, virtio_gpu_handle_ctrl_cb);
         g->cursor_vq = virtio_add_queue(vdev, 16, virtio_gpu_handle_cursor_cb);

include/hw/virtio/virtio-gpu.h

@@ -171,5 +171,5 @@ void virtio_gpu_virgl_fence_poll(VirtIOGPU *g);
 void virtio_gpu_virgl_reset(VirtIOGPU *g);
 void virtio_gpu_gl_block(void *opaque, bool block);
 int virtio_gpu_virgl_init(VirtIOGPU *g);
-
+int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g);
 #endif

include/standard-headers/linux/virtio_gpu.h

@@ -260,6 +260,7 @@ struct virtio_gpu_cmd_submit {
 };
 
 #define VIRTIO_GPU_CAPSET_VIRGL 1
+#define VIRTIO_GPU_CAPSET_VIRGL2 2
 
 /* VIRTIO_GPU_CMD_GET_CAPSET_INFO */
 struct virtio_gpu_get_capset_info {