[Intel-gfx] [PATCH v2] drm/i915: Tune down init error message due to failure injection

[Imre Deak]

Atm, in case failure injection forces an error the subsequent
"*ERROR* failed to init modeset" error message will make automated
tests (CI) report this event as a breakage even though the event is
expected. To fix this print the error message with debug log level
in this case.

While at it print the error message for any init failure for
consistency.

v2:
- Include the problematic error message in the commit log, add a
  request to file an fdo bug to the message (Chris)

CC: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/i915_dma.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 68592b0..b4ece9e 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -66,6 +66,14 @@ bool __i915_inject_load_failure(const char *func, int line)
 	return false;
 }
 
+#define i915_load_error(fmt, ...) do {					\
+	if (i915.inject_load_failure &&					\
+	    i915_load_fail_count == i915.inject_load_failure)		\
+		DRM_DEBUG_DRIVER(fmt, ##__VA_ARGS__);			\
+	else								\
+		DRM_ERROR(fmt, ##__VA_ARGS__);				\
+} while(0)
+
 static int i915_getparam(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv)
 {
@@ -1332,10 +1340,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	}
 
 	ret = i915_load_modeset_init(dev);
-	if (ret < 0) {
-		DRM_ERROR("failed to init modeset\n");
+	if (ret < 0)
 		goto out_cleanup_vblank;
-	}
 
 	i915_driver_register(dev_priv);
 
@@ -1357,6 +1363,8 @@ out_runtime_pm_put:
 out_free_priv:
 	kfree(dev_priv);
 
+	i915_load_error("Device initialization failed (%d), please file a bug at https://bugs.freedesktop.org providing the dmesg log by booting with drm.debug=0xf\n", ret);
+
 	return ret;
 }
 
-- 
2.5.0