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_URL "https://bugs.freedesktop.org/enter_bug.cgi?product=DRI"
12 #define FDO_BUG_MSG "Please file a bug at " FDO_BUG_URL " against DRM/Intel " \
13 "providing the dmesg log by booting with drm.debug=0xf"
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 & 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
54 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
55 static unsigned int i915_probe_fail_count;
56
__i915_inject_load_error(struct drm_i915_private * i915,int err,const char * func,int line)57 int __i915_inject_load_error(struct drm_i915_private *i915, int err,
58 const char *func, int line)
59 {
60 if (i915_probe_fail_count >= i915_modparams.inject_load_failure)
61 return 0;
62
63 if (++i915_probe_fail_count < i915_modparams.inject_load_failure)
64 return 0;
65
66 __i915_printk(i915, KERN_INFO,
67 "Injecting failure %d at checkpoint %u [%s:%d]\n",
68 err, i915_modparams.inject_load_failure, func, line);
69 i915_modparams.inject_load_failure = 0;
70 return err;
71 }
72
i915_error_injected(void)73 bool i915_error_injected(void)
74 {
75 return i915_probe_fail_count && !i915_modparams.inject_load_failure;
76 }
77
78 #endif
79