1 // SPDX-License-Identifier: MIT
2 /*
3 * Copyright © 2019 Intel Corporation
4 */
5
6 #include <drm/drm_drv.h>
7
8 #include "i915_drv.h"
9 #include "i915_utils.h"
10
11 #define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
12
13 void
__i915_printk(struct drm_i915_private * dev_priv,const char * level,const char * fmt,...)14 __i915_printk(struct drm_i915_private *dev_priv, const char *level,
15 const char *fmt, ...)
16 {
17 static bool shown_bug_once;
18 struct device *kdev = dev_priv->drm.dev;
19 bool is_error = level[1] <= KERN_ERR[1];
20 bool is_debug = level[1] == KERN_DEBUG[1];
21 struct va_format vaf;
22 va_list args;
23
24 if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
25 return;
26
27 va_start(args, fmt);
28
29 vaf.fmt = fmt;
30 vaf.va = &args;
31
32 if (is_error)
33 dev_printk(level, kdev, "%pV", &vaf);
34 else
35 dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
36 __builtin_return_address(0), &vaf);
37
38 va_end(args);
39
40 if (is_error && !shown_bug_once) {
41 /*
42 * Ask the user to file a bug report for the error, except
43 * if they may have caused the bug by fiddling with unsafe
44 * module parameters.
45 */
46 if (!test_taint(TAINT_USER))
47 dev_notice(kdev, "%s", FDO_BUG_MSG);
48 shown_bug_once = true;
49 }
50 }
51
add_taint_for_CI(struct drm_i915_private * i915,unsigned int taint)52 void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
53 {
54 __i915_printk(i915, KERN_NOTICE, "CI tainted:%#x by %pS\n",
55 taint, (void *)_RET_IP_);
56
57 /* Failures that occur during fault injection testing are expected */
58 if (!i915_error_injected())
59 __add_taint_for_CI(taint);
60 }
61
62 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
63 static unsigned int i915_probe_fail_count;
64
__i915_inject_probe_error(struct drm_i915_private * i915,int err,const char * func,int line)65 int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
66 const char *func, int line)
67 {
68 if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
69 return 0;
70
71 if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
72 return 0;
73
74 __i915_printk(i915, KERN_INFO,
75 "Injecting failure %d at checkpoint %u [%s:%d]\n",
76 err, i915_modparams.inject_probe_failure, func, line);
77 i915_modparams.inject_probe_failure = 0;
78 return err;
79 }
80
i915_error_injected(void)81 bool i915_error_injected(void)
82 {
83 return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
84 }
85
86 #endif
87
cancel_timer(struct timer_list * t)88 void cancel_timer(struct timer_list *t)
89 {
90 if (!READ_ONCE(t->expires))
91 return;
92
93 del_timer(t);
94 WRITE_ONCE(t->expires, 0);
95 }
96
set_timer_ms(struct timer_list * t,unsigned long timeout)97 void set_timer_ms(struct timer_list *t, unsigned long timeout)
98 {
99 if (!timeout) {
100 cancel_timer(t);
101 return;
102 }
103
104 timeout = msecs_to_jiffies(timeout);
105
106 /*
107 * Paranoia to make sure the compiler computes the timeout before
108 * loading 'jiffies' as jiffies is volatile and may be updated in
109 * the background by a timer tick. All to reduce the complexity
110 * of the addition and reduce the risk of losing a jiffie.
111 */
112 barrier();
113
114 /* Keep t->expires = 0 reserved to indicate a canceled timer. */
115 mod_timer(t, jiffies + timeout ?: 1);
116 }
117