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      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  */
     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