drm/i915: Squash GEM load failure message (again)

Due to a silent conflict (silent because we are trying to fix the CI
test that is meant to exercising these failures!) between commit
51e645b6 ("drm/i915: Mark the GPU as wedged without error on fault
injection") and commit 8571a05a ("drm/i915: Use GEM suspend when
aborting initialisation"), we failed to actually squash the error
message after injecting the load failure.

Rearrange the code to export i915_load_failure() for better logging of
real errors (and quiet logging of injected errors).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180609111058.2660-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.c

@@ -73,6 +73,12 @@ bool __i915_inject_load_failure(const char *func, int line)
 
 	return false;
 }
+
+bool i915_error_injected(void)
+{
+	return i915_load_fail_count && !i915_modparams.inject_load_failure;
+}
+
 #endif
 
 #define FDO_BUG_URL "https://bugs.freedesktop.org/enter_bug.cgi?product=DRI"
@@ -115,20 +121,6 @@ __i915_printk(struct drm_i915_private *dev_priv, const char *level,
 	va_end(args);
 }
 
-static bool i915_error_injected(struct drm_i915_private *dev_priv)
-{
-#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
-	return i915_load_fail_count && !i915_modparams.inject_load_failure;
-#else
-	return false;
-#endif
-}
-
-#define i915_load_error(i915, fmt, ...)					 \
-	__i915_printk(i915,						 \
-		      i915_error_injected(i915) ? KERN_DEBUG : KERN_ERR, \
-		      fmt, ##__VA_ARGS__)
-
 /* Map PCH device id to PCH type, or PCH_NONE if unknown. */
 static enum intel_pch
 intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)

drivers/gpu/drm/i915/i915_drv.h

@@ -108,13 +108,24 @@
 	I915_STATE_WARN((x), "%s", "WARN_ON(" __stringify(x) ")")
 
 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
+
 bool __i915_inject_load_failure(const char *func, int line);
 #define i915_inject_load_failure() \
 	__i915_inject_load_failure(__func__, __LINE__)
+
+bool i915_error_injected(void);
+
 #else
+
 #define i915_inject_load_failure() false
+#define i915_error_injected() false
+
 #endif
 
+#define i915_load_error(i915, fmt, ...)					 \
+	__i915_printk(i915, i915_error_injected() ? KERN_DEBUG : KERN_ERR, \
+		      fmt, ##__VA_ARGS__)
+
 typedef struct {
 	uint32_t val;
 } uint_fixed_16_16_t;

drivers/gpu/drm/i915/i915_gem.c

@@ -5491,8 +5491,6 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
 	}
 
 	if (i915_inject_load_failure()) {
-		DRM_DEBUG_DRIVER("Marking the driver as wedged\n");
-		i915_gem_set_wedged(dev_priv);  /* Fail silently! */
 		ret = -EIO;
 		goto err_init_hw;
 	}
@@ -5543,7 +5541,8 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
 		 * for all other failure, such as an allocation failure, bail.
 		 */
 		if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
-			DRM_ERROR("Failed to initialize GPU, declaring it wedged\n");
+			i915_load_error(dev_priv,
+					"Failed to initialize GPU, declaring it wedged!\n");
 			i915_gem_set_wedged(dev_priv);
 		}
 		ret = 0;