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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970/* SPDX-License-Identifier: GPL-2.0 or MIT */
/* * Copyright (c) 2024 Intel * Copyright (c) 2024 Red Hat */
#ifndef __DRM_PANIC_INTERNAL_H__#define __DRM_PANIC_INTERNAL_H__
#include <linux/spinlock.h>
struct drm_device;
#ifdef CONFIG_DRM_PANIC
/** * drm_panic_lock - protect panic printing relevant state * @dev: struct drm_device * @flags: unsigned long irq flags you need to pass to the unlock() counterpart * * This function must be called to protect software and hardware state that the * panic printing code must be able to rely on. The protected sections must be * as small as possible. It uses the irqsave/irqrestore variant, and can be * called from irq handler. Examples include: * * - Access to peek/poke or other similar registers, if that is the way the * driver prints the pixels into the scanout buffer at panic time. * * - Updates to pointers like &drm_plane.state, allowing the panic handler to * safely deference these. This is done in drm_atomic_helper_swap_state(). * * - An state that isn't invariant and that the driver must be able to access * during panic printing. */#define drm_panic_lock(dev, flags) \ raw_spin_lock_irqsave(&(dev)->mode_config.panic_lock, flags)
/** * drm_panic_unlock - end of the panic printing critical section * @dev: struct drm_device * @flags: irq flags that were returned when acquiring the lock * * Unlocks the raw spinlock acquired by either drm_panic_lock() or * drm_panic_trylock(). */#define drm_panic_unlock(dev, flags) \ raw_spin_unlock_irqrestore(&(dev)->mode_config.panic_lock, flags)
#elsestatic inline void drm_panic_lock(struct drm_device *dev, unsigned long flags) {}static inline void drm_panic_unlock(struct drm_device *dev, unsigned long flags) {}#endif
#if IS_ENABLED(CONFIG_DRM_PANIC_HELPER)/* drm_panic_helper.c */int __init drm_panic_helper_init(void);void __exit drm_panic_helper_exit(void);#elsestatic inline int __init drm_panic_helper_init(void){ return 0;}
static inline void __exit drm_panic_helper_exit(void){ }#endif
#endif /* __DRM_PANIC_INTERNAL_H__ */