Current File : //proc/self/root/usr/src/linux-headers-5.15.0-125/include/drm/drm_util.h
/*
* Internal Header for the Direct Rendering Manager
*
* Copyright 2018 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _DRM_UTIL_H_
#define _DRM_UTIL_H_
/**
* DOC: drm utils
*
* Macros and inline functions that does not naturally belong in other places
*/
#include <linux/interrupt.h>
#include <linux/kgdb.h>
#include <linux/preempt.h>
#include <linux/smp.h>
/*
* Use EXPORT_SYMBOL_FOR_TESTS_ONLY() for functions that shall
* only be visible for drmselftests.
*/
#if defined(CONFIG_DRM_EXPORT_FOR_TESTS)
#define EXPORT_SYMBOL_FOR_TESTS_ONLY(x) EXPORT_SYMBOL(x)
#else
#define EXPORT_SYMBOL_FOR_TESTS_ONLY(x)
#endif
/**
* for_each_if - helper for handling conditionals in various for_each macros
* @condition: The condition to check
*
* Typical use::
*
* #define for_each_foo_bar(x, y) \'
* list_for_each_entry(x, y->list, head) \'
* for_each_if(x->something == SOMETHING)
*
* The for_each_if() macro makes the use of for_each_foo_bar() less error
* prone.
*/
#define for_each_if(condition) if (!(condition)) {} else
/**
* drm_can_sleep - returns true if currently okay to sleep
*
* This function shall not be used in new code.
* The check for running in atomic context may not work - see linux/preempt.h.
*
* FIXME: All users of drm_can_sleep should be removed (see todo.rst)
*
* Returns:
* False if kgdb is active, we are in atomic context or irqs are disabled.
*/
static inline bool drm_can_sleep(void)
{
if (in_atomic() || in_dbg_master() || irqs_disabled())
return false;
return true;
}
#endif
Mini Shell