// SPDX-License-Identifier: MIT /* * Copyright © 2019 Intel Corporation */ #include <drm/drm_drv.h> #include "i915_drv.h" #include "i915_utils.h" #define FDO_BUG_URL "https://bugs.freedesktop.org/enter_bug.cgi?product=DRI" #define FDO_BUG_MSG "Please file a bug at " FDO_BUG_URL " against DRM/Intel " \ "providing the dmesg log by booting with drm.debug=0xf" void __i915_printk(struct drm_i915_private *dev_priv, const char *level, const char *fmt, ...) { static bool shown_bug_once; struct device *kdev = dev_priv->drm.dev; bool is_error = level[1] <= KERN_ERR[1]; bool is_debug = level[1] == KERN_DEBUG[1]; struct va_format vaf; va_list args; if (is_debug && !(drm_debug & DRM_UT_DRIVER)) return; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; if (is_error) dev_printk(level, kdev, "%pV", &vaf); else dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV", __builtin_return_address(0), &vaf); va_end(args); if (is_error && !shown_bug_once) { /* * Ask the user to file a bug report for the error, except * if they may have caused the bug by fiddling with unsafe * module parameters. */ if (!test_taint(TAINT_USER)) dev_notice(kdev, "%s", FDO_BUG_MSG); shown_bug_once = true; } } #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) static unsigned int i915_probe_fail_count; int __i915_inject_probe_error(struct drm_i915_private *i915, int err, const char *func, int line) { if (i915_probe_fail_count >= i915_modparams.inject_probe_failure) return 0; if (++i915_probe_fail_count < i915_modparams.inject_probe_failure) return 0; __i915_printk(i915, KERN_INFO, "Injecting failure %d at checkpoint %u [%s:%d]\n", err, i915_modparams.inject_probe_failure, func, line); i915_modparams.inject_probe_failure = 0; return err; } bool i915_error_injected(void) { return i915_probe_fail_count && !i915_modparams.inject_probe_failure; } #endif void cancel_timer(struct timer_list *t) { if (!READ_ONCE(t->expires)) return; del_timer(t); WRITE_ONCE(t->expires, 0); } void set_timer_ms(struct timer_list *t, unsigned long timeout) { if (!timeout) { cancel_timer(t); return; } timeout = msecs_to_jiffies_timeout(timeout); /* * Paranoia to make sure the compiler computes the timeout before * loading 'jiffies' as jiffies is volatile and may be updated in * the background by a timer tick. All to reduce the complexity * of the addition and reduce the risk of losing a jiffie. */ barrier(); mod_timer(t, jiffies + timeout); }