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 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 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 99 bool i915_error_injected(void) 100 { 101 return i915_probe_fail_count && !i915_modparams.inject_probe_failure; 102 } 103 104 #endif 105 106 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 } 118 119 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