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 #include <linux/util_macros.h> 40 41 /* 42 * Use EXPORT_SYMBOL_FOR_TESTS_ONLY() for functions that shall 43 * only be visible for drmselftests. 44 */ 45 #if defined(CONFIG_DRM_EXPORT_FOR_TESTS) 46 #define EXPORT_SYMBOL_FOR_TESTS_ONLY(x) EXPORT_SYMBOL(x) 47 #else 48 #define EXPORT_SYMBOL_FOR_TESTS_ONLY(x) 49 #endif 50 51 /** 52 * drm_can_sleep - returns true if currently okay to sleep 53 * 54 * This function shall not be used in new code. 55 * The check for running in atomic context may not work - see linux/preempt.h. 56 * 57 * FIXME: All users of drm_can_sleep should be removed (see todo.rst) 58 * 59 * Returns: 60 * False if kgdb is active, we are in atomic context or irqs are disabled. 61 */ 62 static inline bool drm_can_sleep(void) 63 { 64 if (in_atomic() || in_dbg_master() || irqs_disabled()) 65 return false; 66 return true; 67 } 68 69 #endif 70