Search for first Intel GPU rather than hard code renderD128

Previously we assume that renderD128 is the device we want, which breaks
when scenarios become complicated. Instead, search for Intel GPUs and
use the first one (being iGPU if present).

Tracked-On: OAM-124779
Signed-off-by: Weifeng Liu <[email protected]>

media_driver/linux/common/ddi/media_libva.cpp

@@ -37,6 +37,7 @@
 #endif
 
 #include <linux/fb.h>
+#include <xf86drm.h>
 
 #include "media_libva.h"
 
@@ -1565,6 +1566,33 @@ void DestroyMediaContextMutex(PDDI_MEDIA_CONTEXT mediaCtx)
     return;
 }
 
+static int DdiMedia_SelectIntelDevice()
+{
+    int intel_gpu_index = -1;
+    for (int i = 0; i < 16; ++i) {
+        char device_path[64];
+        sprintf(device_path, "/dev/dri/renderD%d", 128 + i);
+        int temp = open(device_path, O_RDWR | O_CLOEXEC);
+        if (temp == -1) {
+            continue;
+        }
+        drmVersionPtr version = drmGetVersion(temp);
+        if (version == nullptr) {
+            close(temp);
+            continue;
+        }
+        if (strncmp(version->name, "i915", strlen("i915")) == 0) {
+            intel_gpu_index = i;
+            drmFreeVersion(version);
+            close(temp);
+            break;
+        }
+        drmFreeVersion(version);
+        close(temp);
+    }
+    return intel_gpu_index;
+}
+
 VAStatus DdiMedia_GetDeviceFD (
     VADriverContextP ctx,
     int32_t         *pDevicefd
@@ -1578,7 +1606,14 @@ VAStatus DdiMedia_GetDeviceFD (
     if(pDRMState->fd < 0)
     {
         DDI_ASSERTMESSAGE("DDI:LIBVA Wrapper doesn't pass file descriptor for graphics adaptor, trying to open the graphics... ");
-        pDRMState->fd = DdiMediaUtil_OpenGraphicsAdaptor((char *)DEVICE_NAME);
+        int device_id = DdiMedia_SelectIntelDevice();
+        if (device_id < 0) {
+            DDI_ASSERTMESSAGE("DDI: Cannot find candidate DRM device, return failure");
+            return VA_STATUS_ERROR_INVALID_PARAMETER;
+        }
+        char device_name[64];
+        sprintf(device_name, "/dev/dri/renderD%d\n", device_id);
+        pDRMState->fd = DdiMediaUtil_OpenGraphicsAdaptor((char *)device_name);
         if (pDRMState->fd < 0) {
             DDI_ASSERTMESSAGE("DDI: Still failed to open the graphic adaptor, return failure");
             return VA_STATUS_ERROR_INVALID_PARAMETER;