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