1 files changed, 106 insertions, 0 deletions
diff --git a/recipes-graphics/mesa/mesa/0003-loader-Automatic-PRIME-detection.patch b/recipes-graphics/mesa/mesa/0003-loader-Automatic-PRIME-detection.patch
new file mode 100644
index 0000000..d252b18
--- /dev/null
+++ b/recipes-graphics/mesa/mesa/0003-loader-Automatic-PRIME-detection.patch
@@ -0,0 +1,106 @@
+From 0f4808856ce42de4e0cf7e0c3af114165c105003 Mon Sep 17 00:00:00 2001
+From: Thierry Reding <treding@nvidia.com>
+Date: Fri, 23 Dec 2016 21:36:00 +0100
+Subject: [PATCH 3/4] loader: Automatic PRIME detection
+
+If a device doesn't support rendering and support for PRIME isn't
+enabled via the DRI_PRIME environment variable or dri.conf, attempt to
+find a render node which can be used to offload rendering.
+
+Signed-off-by: Thierry Reding <treding@nvidia.com>
+---
+ src/loader/loader.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++---
+ 1 file changed, 67 insertions(+), 4 deletions(-)
+
+diff --git a/src/loader/loader.c b/src/loader/loader.c
+index 5541ccc..19e73a7 100644
+--- a/src/loader/loader.c
++++ b/src/loader/loader.c
+@@ -108,6 +108,71 @@ static char *loader_get_dri_config_device_id(void)
+ }
+ #endif
+ 
++/*
++ * For all devices that do not support rendering, try to find a different
++ * device that will.
++ *
++ * Note that the absence of a render node doesn't technically imply that
++ * the device can't render, but in practice this should work out fine.
++ */
++static int drm_detect_prime_fd(int default_fd, int *different_device)
++{
++   int err, fd = -ENODEV;
++   drmDevicePtr device;
++
++   err = drmGetDevice(default_fd, &device);
++   if (err < 0)
++      goto err;
++
++   if ((device->available_nodes & (1 << DRM_NODE_RENDER)) == 0) {
++      unsigned int num_devices, i;
++      drmDevicePtr *devices;
++
++      err = drmGetDevices(NULL, 0);
++      if (err < 0)
++         goto err;
++
++      num_devices = err;
++
++      devices = calloc(num_devices, sizeof(drmDevicePtr));
++      if (!devices)
++         goto err;
++
++      err = drmGetDevices(devices, num_devices);
++      if (err < 0) {
++         free(devices);
++         goto err;
++      }
++
++      num_devices = err;
++
++      for (i = 0; i < num_devices; i++) {
++         if (devices[i]->available_nodes & (1 << DRM_NODE_RENDER)) {
++            fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
++            if (fd < 0) {
++               fd = -errno;
++               continue;
++            }
++
++            close(default_fd);
++            break;
++         }
++      }
++
++      drmFreeDevices(devices, num_devices);
++      free(devices);
++   }
++
++err:
++   if (fd < 0) {
++      *different_device = 0;
++      return default_fd;
++   }
++
++   *different_device = 1;
++   return fd;
++}
++
+ static char *drm_construct_id_path_tag(drmDevicePtr device)
+ {
+ /* Length of "pci-xxxx_xx_xx_x\0" */
+@@ -170,10 +235,8 @@ int loader_get_user_preferred_fd(int default_fd, int *different_device)
+       prime = loader_get_dri_config_device_id();
+ #endif
+ 
+-   if (prime == NULL) {
+-      *different_device = 0;
+-      return default_fd;
+-   }
++   if (prime == NULL || *prime == '\0')
++      return drm_detect_prime_fd(default_fd, different_device);
+ 
+    default_tag = drm_get_id_path_tag_for_fd(default_fd);
+    if (default_tag == NULL)
+-- 
+2.7.4
+