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 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 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 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 83 bool i915_error_injected(void) 84 { 85 return i915_probe_fail_count && !i915_modparams.inject_probe_failure; 86 } 87 88 #endif 89 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 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 } 119 120 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