display/virtio: add edid support.

This patch adds EDID support to the family of virtio-gpu devices.  It is
turned off by default, use the new edid property to enable it.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20190221081054.13853-1-kraxel@redhat.com

1 files changed, 43 insertions, 0 deletions

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 0baa9ac0ad..a3627f58a9 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -21,6 +21,7 @@
 #include "hw/virtio/virtio.h"
 #include "hw/virtio/virtio-gpu.h"
 #include "hw/virtio/virtio-bus.h"
+#include "hw/display/edid.h"
 #include "migration/blocker.h"
 #include "qemu/log.h"
 #include "qapi/error.h"
@@ -207,6 +208,9 @@ static uint64_t virtio_gpu_get_features(VirtIODevice *vdev, uint64_t features,
     if (virtio_gpu_virgl_enabled(g->conf)) {
         features |= (1 << VIRTIO_GPU_F_VIRGL);
     }
+    if (virtio_gpu_edid_enabled(g->conf)) {
+        features |= (1 << VIRTIO_GPU_F_EDID);
+    }
     return features;
 }
 
@@ -301,6 +305,40 @@ void virtio_gpu_get_display_info(VirtIOGPU *g,
                              sizeof(display_info));
 }
 
+static void
+virtio_gpu_generate_edid(VirtIOGPU *g, int scanout,
+                         struct virtio_gpu_resp_edid *edid)
+{
+    qemu_edid_info info = {
+        .prefx = g->req_state[scanout].width,
+        .prefy = g->req_state[scanout].height,
+    };
+
+    edid->size = cpu_to_le32(sizeof(edid->edid));
+    qemu_edid_generate(edid->edid, sizeof(edid->edid), &info);
+}
+
+void virtio_gpu_get_edid(VirtIOGPU *g,
+                         struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virtio_gpu_resp_edid edid;
+    struct virtio_gpu_cmd_get_edid get_edid;
+
+    VIRTIO_GPU_FILL_CMD(get_edid);
+    virtio_gpu_bswap_32(&get_edid, sizeof(get_edid));
+
+    if (get_edid.scanout >= g->conf.max_outputs) {
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    trace_virtio_gpu_cmd_get_edid(get_edid.scanout);
+    memset(&edid, 0, sizeof(edid));
+    edid.hdr.type = VIRTIO_GPU_RESP_OK_EDID;
+    virtio_gpu_generate_edid(g, get_edid.scanout, &edid);
+    virtio_gpu_ctrl_response(g, cmd, &edid.hdr, sizeof(edid));
+}
+
 static pixman_format_code_t get_pixman_format(uint32_t virtio_gpu_format)
 {
     switch (virtio_gpu_format) {
@@ -839,6 +877,9 @@ static void virtio_gpu_simple_process_cmd(VirtIOGPU *g,
     case VIRTIO_GPU_CMD_GET_DISPLAY_INFO:
         virtio_gpu_get_display_info(g, cmd);
         break;
+    case VIRTIO_GPU_CMD_GET_EDID:
+        virtio_gpu_get_edid(g, cmd);
+        break;
     case VIRTIO_GPU_CMD_RESOURCE_CREATE_2D:
         virtio_gpu_resource_create_2d(g, cmd);
         break;
@@ -1369,6 +1410,8 @@ static Property virtio_gpu_properties[] = {
     DEFINE_PROP_BIT("stats", VirtIOGPU, conf.flags,
                     VIRTIO_GPU_FLAG_STATS_ENABLED, false),
 #endif
+    DEFINE_PROP_BIT("edid", VirtIOGPU, conf.flags,
+                    VIRTIO_GPU_FLAG_EDID_ENABLED, false),
     DEFINE_PROP_UINT32("xres", VirtIOGPU, conf.xres, 1024),
     DEFINE_PROP_UINT32("yres", VirtIOGPU, conf.yres, 768),
     DEFINE_PROP_END_OF_LIST(),