1 files changed, 74 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..89b920ccbccb
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_utils.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include <linux/device.h>
+
+#include <drm/drm_drv.h>
+#include <drm/drm_print.h>
+
+#include "i915_drv.h"
+#include "i915_reg.h"
+#include "i915_utils.h"
+
+void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
+{
+	drm_notice(&i915->drm, "CI tainted: %#x by %pS\n",
+		   taint, __builtin_return_address(0));
+
+	/* Failures that occur during fault injection testing are expected */
+	if (!i915_error_injected())
+		__add_taint_for_CI(taint);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
+static unsigned int i915_probe_fail_count;
+
+int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
+			      const char *func, int line)
+{
+	if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
+		return 0;
+
+	if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
+		return 0;
+
+	drm_info(&i915->drm, "Injecting failure %d at checkpoint %u [%s:%d]\n",
+		 err, i915_modparams.inject_probe_failure, func, line);
+
+	i915_modparams.inject_probe_failure = 0;
+	return err;
+}
+
+bool i915_error_injected(void)
+{
+	return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
+}
+
+#endif
+
+bool i915_vtd_active(struct drm_i915_private *i915)
+{
+	if (device_iommu_mapped(i915->drm.dev))
+		return true;
+
+	/* Running as a guest, we assume the host is enforcing VT'd */
+	return i915_run_as_guest();
+}
+
+bool i915_direct_stolen_access(struct drm_i915_private *i915)
+{
+	/*
+	 * Wa_22018444074
+	 *
+	 * Access via BAR can hang MTL, go directly to GSM/DSM,
+	 * except for VM guests which won't have access to it.
+	 *
+	 * Normally this would not work but on MTL the system firmware
+	 * should have relaxed the access permissions sufficiently.
+	 * 0x138914==0x1 indicates that the firmware has done its job.
+	 */
+	return IS_METEORLAKE(i915) && !i915_run_as_guest() &&
+		intel_uncore_read(&i915->uncore, MTL_PCODE_STOLEN_ACCESS) == STOLEN_ACCESS_ALLOWED;
+}