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path: root/drivers/gpu/drm/i915/i915_utils.c
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Diffstat (limited to 'drivers/gpu/drm/i915/i915_utils.c')
-rw-r--r--drivers/gpu/drm/i915/i915_utils.c127
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();
+}