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
15 void
__i915_printk(struct drm_i915_private * dev_priv,const char * level,const char * fmt,...)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
add_taint_for_CI(struct drm_i915_private * i915,unsigned int taint)54 void 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)
65 static unsigned int i915_probe_fail_count;
66
__i915_inject_probe_error(struct drm_i915_private * i915,int err,const char * func,int line)67 int __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
i915_error_injected(void)83 bool i915_error_injected(void)
84 {
85 return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
86 }
87
88 #endif
89
cancel_timer(struct timer_list * t)90 void 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
set_timer_ms(struct timer_list * t,unsigned long timeout)99 void 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
i915_vtd_active(struct drm_i915_private * i915)120 bool 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 }
128