[RFC QEMU PATCH 11/18] virtio-gpu: make blob scanout use dmabuf fd

[Huang Rui]

From: Robert Beckett <bob.beckett@collabora.com>

This relies on a virglrenderer change to include the dmabuf fd when
returning resource info.

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
---
 hw/display/virtio-gpu-virgl.c  | 103 ++++++++++++++++++++++++++++++++-
 hw/display/virtio-gpu.c        |   4 +-
 include/hw/virtio/virtio-gpu.h |   5 ++
 3 files changed, 109 insertions(+), 3 deletions(-)

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 1fe144f64d..69083d15a9 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -18,6 +18,7 @@
 #include "hw/virtio/virtio-gpu.h"
 #include "hw/virtio/virtio-gpu-bswap.h"
 #include "hw/virtio/virtio-iommu.h"
+#include "hw/virtio/virtio-gpu-pixman.h"
 
 #include <virglrenderer.h>
 
@@ -208,6 +209,106 @@ static void virgl_cmd_set_scanout(VirtIOGPU *g,
     g->parent_obj.scanout[ss.scanout_id].resource_id = ss.resource_id;
 }
 
+static void virgl_cmd_set_scanout_blob(VirtIOGPU *g,
+                                 struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virtio_gpu_simple_resource *res;
+    struct virtio_gpu_framebuffer fb = { 0 };
+    struct virtio_gpu_set_scanout_blob ss;
+    struct virgl_renderer_resource_info info;
+    uint64_t fbend;
+
+    VIRTIO_GPU_FILL_CMD(ss);
+    virtio_gpu_scanout_blob_bswap(&ss);
+    trace_virtio_gpu_cmd_set_scanout_blob(ss.scanout_id, ss.resource_id,
+                                          ss.r.width, ss.r.height, ss.r.x,
+                                          ss.r.y);
+
+    if (ss.scanout_id >= g->parent_obj.conf.max_outputs) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: illegal scanout id specified %d",
+                      __func__, ss.scanout_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID;
+        return;
+    }
+
+    if (ss.resource_id == 0) {
+        virtio_gpu_disable_scanout(g, ss.scanout_id);
+        return;
+    }
+
+    if (ss.width < 16 ||
+       ss.height < 16 ||
+       ss.r.x + ss.r.width > ss.width ||
+       ss.r.y + ss.r.height > ss.height) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: illegal scanout %d bounds for"
+                      " resource %d, rect (%d,%d)+%d,%d, fb %d %d\n",
+                      __func__, ss.scanout_id, ss.resource_id,
+                      ss.r.x, ss.r.y, ss.r.width, ss.r.height,
+                      ss.width, ss.height);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    if (!console_has_gl(g->parent_obj.scanout[ss.scanout_id].con)) {
+           qemu_log_mask(LOG_GUEST_ERROR, "%s: unable to scanout blot without 
GL!\n", __func__);
+           return;
+    }
+
+    res = virtio_gpu_find_resource(g, ss.resource_id);
+    if (!res) {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "%s: illegal resource specified %d\n",
+                          __func__, ss.resource_id);
+            cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+            return;
+    }
+    if (virgl_renderer_resource_get_info(ss.resource_id, &info)) {
+            qemu_log_mask(LOG_GUEST_ERROR,
+                          "%s: illegal virgl resource specified %d\n",
+                          __func__, ss.resource_id);
+            cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+            return;
+    }
+    if (!res->dmabuf_fd && info.fd)
+           res->dmabuf_fd = info.fd;
+
+    fb.format = virtio_gpu_get_pixman_format(ss.format);
+    if (!fb.format) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: host couldn't handle guest format %d\n",
+                      __func__, ss.format);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    fb.bytes_pp = DIV_ROUND_UP(PIXMAN_FORMAT_BPP(fb.format), 8);
+    fb.width = ss.width;
+    fb.height = ss.height;
+    fb.stride = ss.strides[0];
+    fb.offset = ss.offsets[0] + ss.r.x * fb.bytes_pp + ss.r.y * fb.stride;
+
+    fbend = fb.offset;
+    fbend += fb.stride * (ss.r.height - 1);
+    fbend += fb.bytes_pp * ss.r.width;
+    if (fbend > res->blob_size) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: fb end out of range\n",
+                      __func__);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    g->parent_obj.enable = 1;
+    if (virtio_gpu_update_dmabuf(g, ss.scanout_id, res, &fb, &ss.r)) {
+           qemu_log_mask(LOG_GUEST_ERROR,
+                         "%s: failed to update dmabuf\n", __func__);
+           cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+           return;
+    }
+    virtio_gpu_update_scanout(g, ss.scanout_id, res, &ss.r);
+}
+
+
 static void virgl_cmd_submit_3d(VirtIOGPU *g,
                                 struct virtio_gpu_ctrl_command *cmd)
 {
@@ -654,7 +755,7 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
         virgl_cmd_resource_create_blob(g, cmd);
         break;
     case VIRTIO_GPU_CMD_SET_SCANOUT_BLOB:
-        virtio_gpu_set_scanout_blob(g, cmd);
+        virgl_cmd_set_scanout_blob(g, cmd);
         break;
     case VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB:
         virgl_cmd_resource_map_blob(g, cmd);
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 1e334a1e78..95e421a525 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -371,7 +371,7 @@ static void virtio_gpu_resource_create_blob(VirtIOGPU *g,
     QTAILQ_INSERT_HEAD(&g->reslist, res, next);
 }
 
-static void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id)
+void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id)
 {
     struct virtio_gpu_scanout *scanout = &g->parent_obj.scanout[scanout_id];
     struct virtio_gpu_simple_resource *res;
@@ -575,7 +575,7 @@ static void virtio_unref_resource(pixman_image_t *image, 
void *data)
     pixman_image_unref(data);
 }
 
-static void virtio_gpu_update_scanout(VirtIOGPU *g,
+void virtio_gpu_update_scanout(VirtIOGPU *g,
                                       uint32_t scanout_id,
                                       struct virtio_gpu_simple_resource *res,
                                       struct virtio_gpu_rect *r)
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index ce49cdfafb..ba509833db 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -286,6 +286,11 @@ void virtio_gpu_update_cursor_data(VirtIOGPU *g,
                                    uint32_t resource_id);
 void virtio_gpu_set_scanout_blob(VirtIOGPU *g,
                                  struct virtio_gpu_ctrl_command *cmd);
+void virtio_gpu_update_scanout(VirtIOGPU *g,
+                                      uint32_t scanout_id,
+                                      struct virtio_gpu_simple_resource *res,
+                                      struct virtio_gpu_rect *r);
+void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id);
 
 /* virtio-gpu-udmabuf.c */
 bool virtio_gpu_have_udmabuf(void);
-- 
2.25.1