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