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 #include "i915_utils.h"
34 
35 struct drm_i915_private;
36 
37 #ifdef CONFIG_DRM_I915_DEBUG_GEM
38 
39 #define GEM_SHOW_DEBUG() drm_debug_enabled(DRM_UT_DRIVER)
40 
41 #ifdef CONFIG_DRM_I915_DEBUG_GEM_ONCE
42 #define __GEM_BUG(cond) BUG()
43 #else
44 #define __GEM_BUG(cond) \
45 	WARN(1, "%s:%d GEM_BUG_ON(%s)\n", __func__, __LINE__, __stringify(cond))
46 #endif
47 
48 #define GEM_BUG_ON(condition) do { if (unlikely((condition))) {	\
49 		GEM_TRACE_ERR("%s:%d GEM_BUG_ON(%s)\n", \
50 			      __func__, __LINE__, __stringify(condition)); \
51 		GEM_TRACE_DUMP(); \
52 		__GEM_BUG(condition); \
53 		} \
54 	} while(0)
55 #define GEM_WARN_ON(expr) WARN_ON(expr)
56 
57 #define GEM_DEBUG_DECL(var) var
58 #define GEM_DEBUG_EXEC(expr) expr
59 #define GEM_DEBUG_BUG_ON(expr) GEM_BUG_ON(expr)
60 #define GEM_DEBUG_WARN_ON(expr) GEM_WARN_ON(expr)
61 
62 #else
63 
64 #define GEM_SHOW_DEBUG() (0)
65 
66 #define GEM_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr)
67 #define GEM_WARN_ON(expr) ({ unlikely(!!(expr)); })
68 
69 #define GEM_DEBUG_DECL(var)
70 #define GEM_DEBUG_EXEC(expr) do { } while (0)
71 #define GEM_DEBUG_BUG_ON(expr)
72 #define GEM_DEBUG_WARN_ON(expr) ({ BUILD_BUG_ON_INVALID(expr); 0; })
73 #endif
74 
75 #if IS_ENABLED(CONFIG_DRM_I915_TRACE_GEM)
76 #define GEM_TRACE(...) trace_printk(__VA_ARGS__)
77 #define GEM_TRACE_ERR(...) do {						\
78 	pr_err(__VA_ARGS__);						\
79 	trace_printk(__VA_ARGS__);					\
80 } while (0)
81 #define GEM_TRACE_DUMP() \
82 	do { ftrace_dump(DUMP_ALL); __add_taint_for_CI(TAINT_WARN); } while (0)
83 #define GEM_TRACE_DUMP_ON(expr) \
84 	do { if (expr) GEM_TRACE_DUMP(); } while (0)
85 #else
86 #define GEM_TRACE(...) do { } while (0)
87 #define GEM_TRACE_ERR(...) do { } while (0)
88 #define GEM_TRACE_DUMP() do { } while (0)
89 #define GEM_TRACE_DUMP_ON(expr) BUILD_BUG_ON_INVALID(expr)
90 #endif
91 
92 #define I915_GEM_IDLE_TIMEOUT (HZ / 5)
93 
tasklet_lock(struct tasklet_struct * t)94 static inline void tasklet_lock(struct tasklet_struct *t)
95 {
96 	while (!tasklet_trylock(t))
97 		cpu_relax();
98 }
99 
tasklet_is_locked(const struct tasklet_struct * t)100 static inline bool tasklet_is_locked(const struct tasklet_struct *t)
101 {
102 	return test_bit(TASKLET_STATE_RUN, &t->state);
103 }
104 
__tasklet_disable_sync_once(struct tasklet_struct * t)105 static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
106 {
107 	if (!atomic_fetch_inc(&t->count))
108 		tasklet_unlock_spin_wait(t);
109 }
110 
__tasklet_is_enabled(const struct tasklet_struct * t)111 static inline bool __tasklet_is_enabled(const struct tasklet_struct *t)
112 {
113 	return !atomic_read(&t->count);
114 }
115 
__tasklet_enable(struct tasklet_struct * t)116 static inline bool __tasklet_enable(struct tasklet_struct *t)
117 {
118 	return atomic_dec_and_test(&t->count);
119 }
120 
__tasklet_is_scheduled(struct tasklet_struct * t)121 static inline bool __tasklet_is_scheduled(struct tasklet_struct *t)
122 {
123 	return test_bit(TASKLET_STATE_SCHED, &t->state);
124 }
125 
126 #endif /* __I915_GEM_H__ */
127