1 files changed, 127 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 000000000..29fd02bf5
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_utils.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include <linux/device.h>
+
+#include <drm/drm_drv.h>
+
+#include "i915_drv.h"
+#include "i915_utils.h"
+
+#define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
+
+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_enabled(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;
+	}
+}
+
+void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
+{
+	__i915_printk(i915, KERN_NOTICE, "CI tainted:%#x by %pS\n",
+		      taint, (void *)_RET_IP_);
+
+	/* 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;
+
+	__i915_printk(i915, KERN_INFO,
+		      "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
+
+void cancel_timer(struct timer_list *t)
+{
+	if (!timer_active(t))
+		return;
+
+	del_timer(t);
+	WRITE_ONCE(t->expires, 0);
+}
+
+void set_timer_ms(struct timer_list *t, unsigned long timeout)
+{
+	if (!timeout) {
+		cancel_timer(t);
+		return;
+	}
+
+	timeout = msecs_to_jiffies(timeout);
+
+	/*
+	 * Paranoia to make sure the compiler computes the timeout before
+	 * loading 'jiffies' as jiffies is volatile and may be updated in
+	 * the background by a timer tick. All to reduce the complexity
+	 * of the addition and reduce the risk of losing a jiffie.
+	 */
+	barrier();
+
+	/* Keep t->expires = 0 reserved to indicate a canceled timer. */
+	mod_timer(t, jiffies + timeout ?: 1);
+}
+
+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();
+}