1 /* $NetBSD: drm_util.h,v 1.4 2021/12/19 10:32:47 riastradh Exp $ */
2
3 /*
4 * Internal Header for the Direct Rendering Manager
5 *
6 * Copyright 2018 Intel Corporation
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28 #ifndef _DRM_UTIL_H_
29 #define _DRM_UTIL_H_
30
31 /**
32 * DOC: drm utils
33 *
34 * Macros and inline functions that does not naturally belong in other places
35 */
36
37 #include <linux/interrupt.h>
38 #include <linux/kgdb.h>
39 #include <linux/preempt.h>
40 #include <linux/smp.h>
41
42 #ifdef __NetBSD__
43 #include <drm/drm_wait_netbsd.h>
44 #endif
45
46 /*
47 * Use EXPORT_SYMBOL_FOR_TESTS_ONLY() for functions that shall
48 * only be visible for drmselftests.
49 */
50 #if defined(CONFIG_DRM_EXPORT_FOR_TESTS)
51 #define EXPORT_SYMBOL_FOR_TESTS_ONLY(x) EXPORT_SYMBOL(x)
52 #else
53 #define EXPORT_SYMBOL_FOR_TESTS_ONLY(x)
54 #endif
55
56 /**
57 * for_each_if - helper for handling conditionals in various for_each macros
58 * @condition: The condition to check
59 *
60 * Typical use::
61 *
62 * #define for_each_foo_bar(x, y) \'
63 * list_for_each_entry(x, y->list, head) \'
64 * for_each_if(x->something == SOMETHING)
65 *
66 * The for_each_if() macro makes the use of for_each_foo_bar() less error
67 * prone.
68 */
69 #define for_each_if(condition) if (!(condition)) {} else
70
71 /**
72 * drm_can_sleep - returns true if currently okay to sleep
73 *
74 * This function shall not be used in new code.
75 * The check for running in atomic context may not work - see linux/preempt.h.
76 *
77 * FIXME: All users of drm_can_sleep should be removed (see todo.rst)
78 *
79 * Returns:
80 * False if kgdb is active, we are in atomic context or irqs are disabled.
81 */
drm_can_sleep(void)82 static inline bool drm_can_sleep(void)
83 {
84 #ifdef __NetBSD__
85 return false; /* XXX */
86 #else
87 if (in_atomic() || in_dbg_master() || irqs_disabled())
88 return false;
89 return true;
90 #endif
91 }
92
93 #endif
94