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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 (!timer_active(t))
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_reg.h"
12#include "i915_utils.h"
13
14#define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
15
16void
17__i915_printk(struct drm_i915_private *dev_priv, const char *level,
18 const char *fmt, ...)
19{
20 static bool shown_bug_once;
21 struct device *kdev = dev_priv->drm.dev;
22 bool is_error = level[1] <= KERN_ERR[1];
23 bool is_debug = level[1] == KERN_DEBUG[1];
24 struct va_format vaf;
25 va_list args;
26
27 if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
28 return;
29
30 va_start(args, fmt);
31
32 vaf.fmt = fmt;
33 vaf.va = &args;
34
35 if (is_error)
36 dev_printk(level, kdev, "%pV", &vaf);
37 else
38 dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
39 __builtin_return_address(0), &vaf);
40
41 va_end(args);
42
43 if (is_error && !shown_bug_once) {
44 /*
45 * Ask the user to file a bug report for the error, except
46 * if they may have caused the bug by fiddling with unsafe
47 * module parameters.
48 */
49 if (!test_taint(TAINT_USER))
50 dev_notice(kdev, "%s", FDO_BUG_MSG);
51 shown_bug_once = true;
52 }
53}
54
55void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint)
56{
57 __i915_printk(i915, KERN_NOTICE, "CI tainted:%#x by %pS\n",
58 taint, (void *)_RET_IP_);
59
60 /* Failures that occur during fault injection testing are expected */
61 if (!i915_error_injected())
62 __add_taint_for_CI(taint);
63}
64
65#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
66static unsigned int i915_probe_fail_count;
67
68int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
69 const char *func, int line)
70{
71 if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
72 return 0;
73
74 if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
75 return 0;
76
77 __i915_printk(i915, KERN_INFO,
78 "Injecting failure %d at checkpoint %u [%s:%d]\n",
79 err, i915_modparams.inject_probe_failure, func, line);
80 i915_modparams.inject_probe_failure = 0;
81 return err;
82}
83
84bool i915_error_injected(void)
85{
86 return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
87}
88
89#endif
90
91void cancel_timer(struct timer_list *t)
92{
93 if (!timer_active(t))
94 return;
95
96 del_timer(t);
97 WRITE_ONCE(t->expires, 0);
98}
99
100void set_timer_ms(struct timer_list *t, unsigned long timeout)
101{
102 if (!timeout) {
103 cancel_timer(t);
104 return;
105 }
106
107 timeout = msecs_to_jiffies(timeout);
108
109 /*
110 * Paranoia to make sure the compiler computes the timeout before
111 * loading 'jiffies' as jiffies is volatile and may be updated in
112 * the background by a timer tick. All to reduce the complexity
113 * of the addition and reduce the risk of losing a jiffie.
114 */
115 barrier();
116
117 /* Keep t->expires = 0 reserved to indicate a canceled timer. */
118 mod_timer(t, jiffies + timeout ?: 1);
119}
120
121bool i915_vtd_active(struct drm_i915_private *i915)
122{
123 if (device_iommu_mapped(i915->drm.dev))
124 return true;
125
126 /* Running as a guest, we assume the host is enforcing VT'd */
127 return i915_run_as_guest();
128}
129
130bool i915_direct_stolen_access(struct drm_i915_private *i915)
131{
132 /*
133 * Wa_22018444074
134 *
135 * Access via BAR can hang MTL, go directly to GSM/DSM,
136 * except for VM guests which won't have access to it.
137 *
138 * Normally this would not work but on MTL the system firmware
139 * should have relaxed the access permissions sufficiently.
140 * 0x138914==0x1 indicates that the firmware has done its job.
141 */
142 return IS_METEORLAKE(i915) && !i915_run_as_guest() &&
143 intel_uncore_read(&i915->uncore, MTL_PCODE_STOLEN_ACCESS) == STOLEN_ACCESS_ALLOWED;
144}