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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
13void
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
52void 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)
63static unsigned int i915_probe_fail_count;
64
65int __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
81bool i915_error_injected(void)
82{
83 return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
84}
85
86#endif
87
88void 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
97void 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}
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2019 Intel Corporation
4 */
5
6#include <linux/device.h>
7
8#include <drm/drm_drv.h>
9
10#include "i915_drv.h"
11#include "i915_utils.h"
12
13#define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
14
15void
16__i915_printk(struct drm_i915_private *dev_priv, const char *level,
17 const char *fmt, ...)
18{
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];
23 struct va_format vaf;
24 va_list args;
25
26 if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
27 return;
28
29 va_start(args, fmt);
30
31 vaf.fmt = fmt;
32 vaf.va = &args;
33
34 if (is_error)
35 dev_printk(level, kdev, "%pV", &vaf);
36 else
37 dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
38 __builtin_return_address(0), &vaf);
39
40 va_end(args);
41
42 if (is_error && !shown_bug_once) {
43 /*
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
46 * module parameters.
47 */
48 if (!test_taint(TAINT_USER))
49 dev_notice(kdev, "%s", FDO_BUG_MSG);
50 shown_bug_once = true;
51 }
52}
53
54void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
55{
56 __i915_printk(i915, KERN_NOTICE, "CI tainted:%#x by %pS\n",
57 taint, (void *)_RET_IP_);
58
59 /* Failures that occur during fault injection testing are expected */
60 if (!i915_error_injected())
61 __add_taint_for_CI(taint);
62}
63
64#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
65static unsigned int i915_probe_fail_count;
66
67int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
68 const char *func, int line)
69{
70 if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
71 return 0;
72
73 if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
74 return 0;
75
76 __i915_printk(i915, KERN_INFO,
77 "Injecting failure %d at checkpoint %u [%s:%d]\n",
78 err, i915_modparams.inject_probe_failure, func, line);
79 i915_modparams.inject_probe_failure = 0;
80 return err;
81}
82
83bool i915_error_injected(void)
84{
85 return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
86}
87
88#endif
89
90void cancel_timer(struct timer_list *t)
91{
92 if (!timer_active(t))
93 return;
94
95 del_timer(t);
96 WRITE_ONCE(t->expires, 0);
97}
98
99void set_timer_ms(struct timer_list *t, unsigned long timeout)
100{
101 if (!timeout) {
102 cancel_timer(t);
103 return;
104 }
105
106 timeout = msecs_to_jiffies(timeout);
107
108 /*
109 * Paranoia to make sure the compiler computes the timeout before
110 * loading 'jiffies' as jiffies is volatile and may be updated in
111 * the background by a timer tick. All to reduce the complexity
112 * of the addition and reduce the risk of losing a jiffie.
113 */
114 barrier();
115
116 /* Keep t->expires = 0 reserved to indicate a canceled timer. */
117 mod_timer(t, jiffies + timeout ?: 1);
118}
119
120bool i915_vtd_active(struct drm_i915_private *i915)
121{
122 if (device_iommu_mapped(i915->drm.dev))
123 return true;
124
125 /* Running as a guest, we assume the host is enforcing VT'd */
126 return i915_run_as_guest();
127}