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
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 & 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)
55static unsigned int i915_probe_fail_count;
56
57int __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
73bool i915_error_injected(void)
74{
75	return i915_probe_fail_count && !i915_modparams.inject_load_failure;
76}
77
78#endif