cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

drm_util.h (2642B)

      1/*
      2 * Internal Header for the Direct Rendering Manager
      3 *
      4 * Copyright 2018 Intel Corporation
      5 *
      6 * Permission is hereby granted, free of charge, to any person obtaining a
      7 * copy of this software and associated documentation files (the "Software"),
      8 * to deal in the Software without restriction, including without limitation
      9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10 * and/or sell copies of the Software, and to permit persons to whom the
     11 * Software is furnished to do so, subject to the following conditions:
     12 *
     13 * The above copyright notice and this permission notice (including the next
     14 * paragraph) shall be included in all copies or substantial portions of the
     15 * Software.
     16 *
     17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     23 * OTHER DEALINGS IN THE SOFTWARE.
     24 */
     25
     26#ifndef _DRM_UTIL_H_
     27#define _DRM_UTIL_H_
     28
     29/**
     30 * DOC: drm utils
     31 *
     32 * Macros and inline functions that does not naturally belong in other places
     33 */
     34
     35#include <linux/interrupt.h>
     36#include <linux/kgdb.h>
     37#include <linux/preempt.h>
     38#include <linux/smp.h>
     39
     40/*
     41 * Use EXPORT_SYMBOL_FOR_TESTS_ONLY() for functions that shall
     42 * only be visible for drmselftests.
     43 */
     44#if defined(CONFIG_DRM_EXPORT_FOR_TESTS)
     45#define EXPORT_SYMBOL_FOR_TESTS_ONLY(x) EXPORT_SYMBOL(x)
     46#else
     47#define EXPORT_SYMBOL_FOR_TESTS_ONLY(x)
     48#endif
     49
     50/**
     51 * for_each_if - helper for handling conditionals in various for_each macros
     52 * @condition: The condition to check
     53 *
     54 * Typical use::
     55 *
     56 *	#define for_each_foo_bar(x, y) \'
     57 *		list_for_each_entry(x, y->list, head) \'
     58 *			for_each_if(x->something == SOMETHING)
     59 *
     60 * The for_each_if() macro makes the use of for_each_foo_bar() less error
     61 * prone.
     62 */
     63#define for_each_if(condition) if (!(condition)) {} else
     64
     65/**
     66 * drm_can_sleep - returns true if currently okay to sleep
     67 *
     68 * This function shall not be used in new code.
     69 * The check for running in atomic context may not work - see linux/preempt.h.
     70 *
     71 * FIXME: All users of drm_can_sleep should be removed (see todo.rst)
     72 *
     73 * Returns:
     74 * False if kgdb is active, we are in atomic context or irqs are disabled.
     75 */
     76static inline bool drm_can_sleep(void)
     77{
     78	if (in_atomic() || in_dbg_master() || irqs_disabled())
     79		return false;
     80	return true;
     81}
     82
     83#endif