1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_utils.c b/drivers/gpu/drm/i915/i915_utils.c
new file mode 100644
index 000000000000..16acdf7bdbe6
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_utils.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include <drm/drm_drv.h>
+
+#include "i915_drv.h"
+#include "i915_utils.h"
+
+#define FDO_BUG_URL "https://bugs.freedesktop.org/enter_bug.cgi?product=DRI"
+#define FDO_BUG_MSG "Please file a bug at " FDO_BUG_URL " against DRM/Intel " \
+		    "providing the dmesg log by booting with drm.debug=0xf"
+
+void
+__i915_printk(struct drm_i915_private *dev_priv, const char *level,
+	      const char *fmt, ...)
+{
+	static bool shown_bug_once;
+	struct device *kdev = dev_priv->drm.dev;
+	bool is_error = level[1] <= KERN_ERR[1];
+	bool is_debug = level[1] == KERN_DEBUG[1];
+	struct va_format vaf;
+	va_list args;
+
+	if (is_debug && !(drm_debug & DRM_UT_DRIVER))
+		return;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	if (is_error)
+		dev_printk(level, kdev, "%pV", &vaf);
+	else
+		dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
+			   __builtin_return_address(0), &vaf);
+
+	va_end(args);
+
+	if (is_error && !shown_bug_once) {
+		/*
+		 * Ask the user to file a bug report for the error, except
+		 * if they may have caused the bug by fiddling with unsafe
+		 * module parameters.
+		 */
+		if (!test_taint(TAINT_USER))
+			dev_notice(kdev, "%s", FDO_BUG_MSG);
+		shown_bug_once = true;
+	}
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
+static unsigned int i915_probe_fail_count;
+
+int __i915_inject_load_error(struct drm_i915_private *i915, int err,
+			     const char *func, int line)
+{
+	if (i915_probe_fail_count >= i915_modparams.inject_load_failure)
+		return 0;
+
+	if (++i915_probe_fail_count < i915_modparams.inject_load_failure)
+		return 0;
+
+	__i915_printk(i915, KERN_INFO,
+		      "Injecting failure %d at checkpoint %u [%s:%d]\n",
+		      err, i915_modparams.inject_load_failure, func, line);
+	i915_modparams.inject_load_failure = 0;
+	return err;
+}
+
+bool i915_error_injected(void)
+{
+	return i915_probe_fail_count && !i915_modparams.inject_load_failure;
+}
+
+#endif