Mesa (master): turnip: Do better TU_DEBUG=startup logging of drmGetDevices2() failure.

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Module: Mesa
Branch: master
Commit: e67c2e1c96c17b5b57f214297adba2a8a302f994
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e67c2e1c96c17b5b57f214297adba2a8a302f994

Author: Eric Anholt <eric at anholt.net>
Date:   Wed Jun 17 11:25:17 2020 -0700

turnip: Do better TU_DEBUG=startup logging of drmGetDevices2() failure.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2769>

---

 src/freedreno/vulkan/tu_device.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/freedreno/vulkan/tu_device.c b/src/freedreno/vulkan/tu_device.c
index 43ed5f6e4a8..dd046f39eef 100644
--- a/src/freedreno/vulkan/tu_device.c
+++ b/src/freedreno/vulkan/tu_device.c
@@ -501,8 +501,12 @@ tu_enumerate_devices(struct tu_instance *instance)
 
    max_devices = drmGetDevices2(0, devices, ARRAY_SIZE(devices));
 
-   if (instance->debug_flags & TU_DEBUG_STARTUP)
-      tu_logi("Found %d drm nodes", max_devices);
+   if (instance->debug_flags & TU_DEBUG_STARTUP) {
+      if (max_devices < 0)
+         tu_logi("drmGetDevices2 returned error: %s\n", strerror(max_devices));
+      else
+         tu_logi("Found %d drm nodes", max_devices);
+   }
 
    if (max_devices < 1)
       return vk_error(instance, VK_ERROR_INCOMPATIBLE_DRIVER);