xref: /linux/drivers/gpu/drm/i915/i915_gem.h (revision ee88f4ebe57523889fc437bc42f95d9ab89bdd9f)
1 /*
2  * Copyright © 2016 Intel Corporation
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  */
24 
25 #ifndef __I915_GEM_H__
26 #define __I915_GEM_H__
27 
28 #include <linux/bug.h>
29 #include <linux/interrupt.h>
30 
31 #include <drm/drm_drv.h>
32 
33 struct drm_i915_private;
34 
35 #ifdef CONFIG_DRM_I915_DEBUG_GEM
36 
37 #define GEM_SHOW_DEBUG() (drm_debug & DRM_UT_DRIVER)
38 
39 #define GEM_BUG_ON(condition) do { if (unlikely((condition))) {	\
40 		GEM_TRACE_ERR("%s:%d GEM_BUG_ON(%s)\n", \
41 			      __func__, __LINE__, __stringify(condition)); \
42 		BUG(); \
43 		} \
44 	} while(0)
45 #define GEM_WARN_ON(expr) WARN_ON(expr)
46 
47 #define GEM_DEBUG_DECL(var) var
48 #define GEM_DEBUG_EXEC(expr) expr
49 #define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
50 #define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
51 
52 #else
53 
54 #define GEM_SHOW_DEBUG() (0)
55 
56 #define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
57 #define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
58 
59 #define GEM_DEBUG_DECL(var)
60 #define GEM_DEBUG_EXEC(expr) do { } while (0)
61 #define GEM_DEBUG_BUG_ON(expr)
62 #define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
63 #endif
64 
65 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
66 #define GEM_TRACE(...) trace_printk(__VA_ARGS__)
67 #define GEM_TRACE_ERR(...) do {						\
68 	pr_err(__VA_ARGS__);						\
69 	trace_printk(__VA_ARGS__);					\
70 } while (0)
71 #define GEM_TRACE_DUMP() ftrace_dump(DUMP_ALL)
72 #define GEM_TRACE_DUMP_ON(expr) \
73 	do { if (expr) ftrace_dump(DUMP_ALL); } while (0)
74 #else
75 #define GEM_TRACE(...) do { } while (0)
76 #define GEM_TRACE_ERR(...) do { } while (0)
77 #define GEM_TRACE_DUMP() do { } while (0)
78 #define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
79 #endif
80 
81 #define I915_GEM_IDLE_TIMEOUT (HZ / 5)
82 
83 static inline void tasklet_lock(struct tasklet_struct *t)
84 {
85 	while (!tasklet_trylock(t))
86 		cpu_relax();
87 }
88 
89 static inline bool tasklet_is_locked(const struct tasklet_struct *t)
90 {
91 	return test_bit(TASKLET_STATE_RUN, &t->state);
92 }
93 
94 static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
95 {
96 	if (!atomic_fetch_inc(&t->count))
97 		tasklet_unlock_wait(t);
98 }
99 
100 static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
101 {
102 	return !atomic_read(&t->count);
103 }
104 
105 static inline bool __tasklet_enable(struct tasklet_struct *t)
106 {
107 	return atomic_dec_and_test(&t->count);
108 }
109 
110 static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
111 {
112 	return test_bit(TASKLET_STATE_SCHED, &t->state);
113 }
114 
115 #endif /* __I915_GEM_H__ */
116