1 // SPDX-License-Identifier: MIT
3 * Copyright © 2019 Intel Corporation
6 #include <drm/drm_drv.h>
9 #include "i915_utils.h"
11 #define FDO_BUG_URL "https://bugs.freedesktop.org/enter_bug.cgi?product=DRI"
12 #define FDO_BUG_MSG "Please file a bug at " FDO_BUG_URL " against DRM/Intel " \
13 "providing the dmesg log by booting with drm.debug=0xf"
16 __i915_printk(struct drm_i915_private *dev_priv, const char *level,
19 static bool shown_bug_once;
20 struct device *kdev = dev_priv->drm.dev;
21 bool is_error = level[1] <= KERN_ERR[1];
22 bool is_debug = level[1] == KERN_DEBUG[1];
26 if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
35 dev_printk(level, kdev, "%pV", &vaf);
37 dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
38 __builtin_return_address(0), &vaf);
42 if (is_error && !shown_bug_once) {
44 * Ask the user to file a bug report for the error, except
45 * if they may have caused the bug by fiddling with unsafe
48 if (!test_taint(TAINT_USER))
49 dev_notice(kdev, "%s", FDO_BUG_MSG);
50 shown_bug_once = true;
54 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
55 static unsigned int i915_probe_fail_count;
57 int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
58 const char *func, int line)
60 if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
63 if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
66 __i915_printk(i915, KERN_INFO,
67 "Injecting failure %d at checkpoint %u [%s:%d]\n",
68 err, i915_modparams.inject_probe_failure, func, line);
69 i915_modparams.inject_probe_failure = 0;
73 bool i915_error_injected(void)
75 return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
80 void cancel_timer(struct timer_list *t)
82 if (!READ_ONCE(t->expires))
86 WRITE_ONCE(t->expires, 0);
89 void set_timer_ms(struct timer_list *t, unsigned long timeout)
96 timeout = msecs_to_jiffies_timeout(timeout);
99 * Paranoia to make sure the compiler computes the timeout before
100 * loading 'jiffies' as jiffies is volatile and may be updated in
101 * the background by a timer tick. All to reduce the complexity
102 * of the addition and reduce the risk of losing a jiffie.
106 mod_timer(t, jiffies + timeout);