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 */ 76 static 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 84