virtio-gpu: splitting one extended mode guest fb into n-scanouts

When guest is running Linux/X11 with extended multiple displays mode enabled,
the guest shares one scanout resource each time containing whole surface
rather than sharing individual display output separately. This extended frame
is properly splited and rendered on the corresponding scanout surfaces but
not in case of blob-resource (zero copy).

This code change lets the qemu split this one large surface data into multiple
in case of blob-resource as well so that each sub frame then can be blitted
properly to each scanout.

v2: resizing qemu console in virtio_gpu_update_dmabuf to scanout's width and
    height

v3: updating stub function of virtio_gpu_update_dmabuf to match the type

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
Message-Id: <20211104065153.28897-5-dongwon.kim@intel.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/hw/display/virtio-gpu-udmabuf-stubs.c b/hw/display/virtio-gpu-udmabuf-stubs.c
index 81f661441ab955c3d828042d0707f6f9117871ef..f692e1351034ada8812f8fe8d5c61017785ec3bc 100644 (file)
--- a/hw/display/virtio-gpu-udmabuf-stubs.c
+++ b/hw/display/virtio-gpu-udmabuf-stubs.c
@@ -20,7 +20,8 @@ void virtio_gpu_fini_udmabuf(struct virtio_gpu_simple_resource *res)
 int virtio_gpu_update_dmabuf(VirtIOGPU *g,
                              uint32_t scanout_id,
                              struct virtio_gpu_simple_resource *res,
-                             struct virtio_gpu_framebuffer *fb)
+                             struct virtio_gpu_framebuffer *fb,
+                             struct virtio_gpu_rect *r)
 {
     /* nothing (stub) */
     return 0;

diff --git a/hw/display/virtio-gpu-udmabuf.c b/hw/display/virtio-gpu-udmabuf.c
index 60ea7f8f49722d3981d0d84a3a9dfa6218074630..1597921c51fca0421690f9ffec3b7aeabbb295a5 100644 (file)
--- a/hw/display/virtio-gpu-udmabuf.c
+++ b/hw/display/virtio-gpu-udmabuf.c
@@ -171,7 +171,8 @@ static VGPUDMABuf
 *virtio_gpu_create_dmabuf(VirtIOGPU *g,
                           uint32_t scanout_id,
                           struct virtio_gpu_simple_resource *res,
-                          struct virtio_gpu_framebuffer *fb)
+                          struct virtio_gpu_framebuffer *fb,
+                          struct virtio_gpu_rect *r)
 {
     VGPUDMABuf *dmabuf;
 
@@ -183,6 +184,10 @@ static VGPUDMABuf
     dmabuf->buf.width = fb->width;
     dmabuf->buf.height = fb->height;
     dmabuf->buf.stride = fb->stride;
+    dmabuf->buf.x = r->x;
+    dmabuf->buf.y = r->y;
+    dmabuf->buf.scanout_width = r->width;
+    dmabuf->buf.scanout_height = r->height;
     dmabuf->buf.fourcc = qemu_pixman_to_drm_format(fb->format);
     dmabuf->buf.fd = res->dmabuf_fd;
     dmabuf->buf.allow_fences = true;
@@ -196,24 +201,25 @@ static VGPUDMABuf
 int virtio_gpu_update_dmabuf(VirtIOGPU *g,
                              uint32_t scanout_id,
                              struct virtio_gpu_simple_resource *res,
-                             struct virtio_gpu_framebuffer *fb)
+                             struct virtio_gpu_framebuffer *fb,
+                             struct virtio_gpu_rect *r)
 {
     struct virtio_gpu_scanout *scanout = &g->parent_obj.scanout[scanout_id];
     VGPUDMABuf *new_primary, *old_primary = NULL;
 
-    new_primary = virtio_gpu_create_dmabuf(g, scanout_id, res, fb);
+    new_primary = virtio_gpu_create_dmabuf(g, scanout_id, res, fb, r);
     if (!new_primary) {
         return -EINVAL;
     }
 
-    if (g->dmabuf.primary) {
-        old_primary = g->dmabuf.primary;
+    if (g->dmabuf.primary[scanout_id]) {
+        old_primary = g->dmabuf.primary[scanout_id];
     }
 
-    g->dmabuf.primary = new_primary;
+    g->dmabuf.primary[scanout_id] = new_primary;
     qemu_console_resize(scanout->con,
-                        new_primary->buf.width,
-                        new_primary->buf.height);
+                        new_primary->buf.scanout_width,
+                        new_primary->buf.scanout_height);
     dpy_gl_scanout_dmabuf(scanout->con, &new_primary->buf);
 
     if (old_primary) {

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 182e0868b09d6a563fa24408dd0bfb18dcdd8b7a..d78b9700c7de50d0f08903121cff3141ae32f430 100644 (file)
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -517,9 +517,9 @@ static void virtio_gpu_resource_flush(VirtIOGPU *g,
                 console_has_gl(scanout->con)) {
                 dpy_gl_update(scanout->con, 0, 0, scanout->width,
                               scanout->height);
-                return;
             }
         }
+        return;
     }
 
     if (!res->blob &&
@@ -627,7 +627,7 @@ static void virtio_gpu_do_set_scanout(VirtIOGPU *g,
 
     if (res->blob) {
         if (console_has_gl(scanout->con)) {
-            if (!virtio_gpu_update_dmabuf(g, scanout_id, res, fb)) {
+            if (!virtio_gpu_update_dmabuf(g, scanout_id, res, fb, r)) {
                 virtio_gpu_update_scanout(g, scanout_id, res, r);
                 return;
             }

diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 24c6628944ea3479af8ce205617c1e5d9391b62f..acfba7c76c10656c4c460d53bc4bbfb1720d6a4a 100644 (file)
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -187,7 +187,7 @@ struct VirtIOGPU {
 
     struct {
         QTAILQ_HEAD(, VGPUDMABuf) bufs;
-        VGPUDMABuf *primary;
+        VGPUDMABuf *primary[VIRTIO_GPU_MAX_SCANOUTS];
     } dmabuf;
 };
 
@@ -273,7 +273,8 @@ void virtio_gpu_fini_udmabuf(struct virtio_gpu_simple_resource *res);
 int virtio_gpu_update_dmabuf(VirtIOGPU *g,
                              uint32_t scanout_id,
                              struct virtio_gpu_simple_resource *res,
-                             struct virtio_gpu_framebuffer *fb);
+                             struct virtio_gpu_framebuffer *fb,
+                             struct virtio_gpu_rect *r);
 
 /* virtio-gpu-3d.c */
 void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,

diff --git a/include/ui/console.h b/include/ui/console.h
index b6bedc5f4152b7bb5e3fcd0bac5a2a590e6539cf..6d678924f6fd2c57cc682abec0e8fe5b761bc8cc 100644 (file)
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -167,6 +167,10 @@ typedef struct QemuDmaBuf {
     uint32_t  fourcc;
     uint64_t  modifier;
     uint32_t  texture;
+    uint32_t  x;
+    uint32_t  y;
+    uint32_t  scanout_width;
+    uint32_t  scanout_height;
     bool      y0_top;
     void      *sync;
     int       fence_fd;