1 /* $NetBSD: i915_utils.c,v 1.4 2021/12/19 11:37:41 riastradh Exp $ */
2
3 // SPDX-License-Identifier: MIT
4 /*
5 * Copyright © 2019 Intel Corporation
6 */
7
8 #include <sys/cdefs.h>
9 __KERNEL_RCSID(0, "$NetBSD: i915_utils.c,v 1.4 2021/12/19 11:37:41 riastradh Exp $");
10
11 #include <drm/drm_drv.h>
12
13 #include "i915_drv.h"
14 #include "i915_utils.h"
15
16 #ifdef __NetBSD__
17 #define NBSD_BUG_URL "https://gnats.NetBSD.org/"
18 #define NBSD_BUG_MSG \
19 "Please file a bug at " NBSD_BUG_URL " in category kern" \
20 " providing the dmesg log by booting with debug/verbose" \
21 " as in `boot -vx'."
22 #else
23 #define FDO_BUG_URL "https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs"
24 #define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
25 #endif
26
27 void
__i915_printk(struct drm_i915_private * dev_priv,const char * level,const char * fmt,...)28 __i915_printk(struct drm_i915_private *dev_priv, const char *level,
29 const char *fmt, ...)
30 {
31 #ifdef __NetBSD__
32 static volatile unsigned done = 0;
33 va_list va;
34
35 va_start(va, fmt);
36 printf("%s: %s ", device_xname(dev_priv->drm.dev), level);
37 vprintf(fmt, va);
38 va_end(va);
39
40 if (strncmp(level, KERN_ERR, strlen(KERN_ERR)) == 0 &&
41 atomic_swap_uint(&done, 1) == 0)
42 printf("%s\n", NBSD_BUG_MSG);
43 #else
44 static bool shown_bug_once;
45 struct device *kdev = dev_priv->drm.dev;
46 bool is_error = level[1] <= KERN_ERR[1];
47 bool is_debug = level[1] == KERN_DEBUG[1];
48 struct va_format vaf;
49 va_list args;
50
51 if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
52 return;
53
54 va_start(args, fmt);
55
56 vaf.fmt = fmt;
57 vaf.va = &args;
58
59 if (is_error)
60 dev_printk(level, kdev, "%pV", &vaf);
61 else
62 dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
63 __builtin_return_address(0), &vaf);
64
65 va_end(args);
66
67 if (is_error && !shown_bug_once) {
68 /*
69 * Ask the user to file a bug report for the error, except
70 * if they may have caused the bug by fiddling with unsafe
71 * module parameters.
72 */
73 if (!test_taint(TAINT_USER))
74 dev_notice(kdev, "%s", FDO_BUG_MSG);
75 shown_bug_once = true;
76 }
77 #endif
78 }
79
80 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
81 static unsigned int i915_probe_fail_count;
82
__i915_inject_probe_error(struct drm_i915_private * i915,int err,const char * func,int line)83 int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
84 const char *func, int line)
85 {
86 if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
87 return 0;
88
89 if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
90 return 0;
91
92 __i915_printk(i915, KERN_INFO,
93 "Injecting failure %d at checkpoint %u [%s:%d]\n",
94 err, i915_modparams.inject_probe_failure, func, line);
95 i915_modparams.inject_probe_failure = 0;
96 return err;
97 }
98
i915_error_injected(void)99 bool i915_error_injected(void)
100 {
101 return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
102 }
103
104 #endif
105
cancel_timer(struct timer_list * t)106 void cancel_timer(struct timer_list *t)
107 {
108 #ifndef __NetBSD__
109 if (!READ_ONCE(t->expires))
110 return;
111 #endif
112
113 del_timer(t);
114 #ifndef __NetBSD__
115 WRITE_ONCE(t->expires, 0);
116 #endif
117 }
118
set_timer_ms(struct timer_list * t,unsigned long timeout)119 void set_timer_ms(struct timer_list *t, unsigned long timeout)
120 {
121 if (!timeout) {
122 cancel_timer(t);
123 return;
124 }
125
126 timeout = msecs_to_jiffies_timeout(timeout);
127
128 /*
129 * Paranoia to make sure the compiler computes the timeout before
130 * loading 'jiffies' as jiffies is volatile and may be updated in
131 * the background by a timer tick. All to reduce the complexity
132 * of the addition and reduce the risk of losing a jiffie.
133 */
134 barrier();
135
136 mod_timer(t, jiffies + timeout);
137 }
138