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      1 /*	$NetBSD: i915_gem.h,v 1.8 2023/08/08 06:59:40 mrg Exp $	*/
      2 
      3 /*
      4  * Copyright  2016 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  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     23  * IN THE SOFTWARE.
     24  *
     25  */
     26 
     27 #ifndef __I915_GEM_H__
     28 #define __I915_GEM_H__
     29 
     30 #include <linux/bug.h>
     31 #include <linux/interrupt.h>
     32 #include <linux/stringify.h>
     33 
     34 #include <drm/drm_drv.h>
     35 
     36 #include "i915_utils.h"
     37 
     38 struct drm_i915_private;
     39 
     40 #ifdef CONFIG_DRM_I915_DEBUG_GEM
     41 
     42 #define GEM_SHOW_DEBUG() drm_debug_enabled(DRM_UT_DRIVER)
     43 
     44 #define GEM_BUG_ON(condition) do { if (unlikely((condition))) {	\
     45 		GEM_TRACE_ERR("%s:%d GEM_BUG_ON(%s)\n", \
     46 			      __func__, __LINE__, __stringify(condition)); \
     47 		GEM_TRACE_DUMP(); \
     48 		BUG(); \
     49 		} \
     50 	} while(0)
     51 #define GEM_WARN_ON(expr) WARN_ON(expr)
     52 
     53 #define GEM_DEBUG_DECL(var) var
     54 #define GEM_DEBUG_EXEC(expr) expr
     55 #define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
     56 #define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
     57 
     58 #else
     59 
     60 #define GEM_SHOW_DEBUG() (0)
     61 
     62 #define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
     63 #define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
     64 
     65 #define GEM_DEBUG_DECL(var)
     66 #define GEM_DEBUG_EXEC(expr) do { } while (0)
     67 #define GEM_DEBUG_BUG_ON(expr)
     68 #define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
     69 #endif
     70 
     71 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
     72 #define GEM_TRACE(...) trace_printk(__VA_ARGS__)
     73 #define GEM_TRACE_ERR(...) do {						\
     74 	pr_err(__VA_ARGS__);						\
     75 	trace_printk(__VA_ARGS__);					\
     76 } while (0)
     77 #define GEM_TRACE_DUMP() \
     78 	do { ftrace_dump(DUMP_ALL); add_taint_for_CI(TAINT_WARN); } while (0)
     79 #define GEM_TRACE_DUMP_ON(expr) \
     80 	do { if (expr) GEM_TRACE_DUMP(); } while (0)
     81 #else
     82 #define GEM_TRACE(...) do { } while (0)
     83 #define GEM_TRACE_ERR(...) do { } while (0)
     84 #define GEM_TRACE_DUMP() do { } while (0)
     85 #define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
     86 #endif
     87 
     88 #define I915_GEM_IDLE_TIMEOUT (HZ / 5)
     89 
     90 static inline void tasklet_lock(struct tasklet_struct *t)
     91 {
     92 	while (!tasklet_trylock(t))
     93 		cpu_relax();
     94 }
     95 
     96 #ifndef __NetBSD__
     97 
     98 static inline bool tasklet_is_locked(const struct tasklet_struct *t)
     99 {
    100 	return test_bit(TASKLET_STATE_RUN, &t->state);
    101 }
    102 
    103 static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
    104 {
    105 	if (!atomic_fetch_inc(&t->count))
    106 		tasklet_unlock_wait(t);
    107 }
    108 
    109 static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
    110 {
    111 	return !atomic_read(&t->count);
    112 }
    113 
    114 static inline bool __tasklet_enable(struct tasklet_struct *t)
    115 {
    116 	return atomic_dec_and_test(&t->count);
    117 }
    118 
    119 static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
    120 {
    121 	return test_bit(TASKLET_STATE_SCHED, &t->state);
    122 }
    123 
    124 #endif
    125 
    126 #endif /* __I915_GEM_H__ */
    127