1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
#ifndef __DRM_EXEC_H__
#define __DRM_EXEC_H__
#include <linux/compiler.h>
#include <linux/ww_mutex.h>
#define DRM_EXEC_INTERRUPTIBLE_WAIT BIT(0)
#define DRM_EXEC_IGNORE_DUPLICATES BIT(1)
struct drm_gem_object;
/**
* struct drm_exec - Execution context
*/
struct drm_exec {
/**
* @flags: Flags to control locking behavior
*/
uint32_t flags;
/**
* @ticket: WW ticket used for acquiring locks
*/
struct ww_acquire_ctx ticket;
/**
* @num_objects: number of objects locked
*/
unsigned int num_objects;
/**
* @max_objects: maximum objects in array
*/
unsigned int max_objects;
/**
* @objects: array of the locked objects
*/
struct drm_gem_object **objects;
/**
* @contended: contended GEM object we backed off for
*/
struct drm_gem_object *contended;
/**
* @prelocked: already locked GEM object due to contention
*/
struct drm_gem_object *prelocked;
};
/**
* drm_exec_obj() - Return the object for a give drm_exec index
* @exec: Pointer to the drm_exec context
* @index: The index.
*
* Return: Pointer to the locked object corresponding to @index if
* index is within the number of locked objects. NULL otherwise.
*/
static inline struct drm_gem_object *
drm_exec_obj(struct drm_exec *exec, unsigned long index)
{
return index < exec->num_objects ? exec->objects[index] : NULL;
}
/**
* drm_exec_for_each_locked_object - iterate over all the locked objects
* @exec: drm_exec object
* @index: unsigned long index for the iteration
* @obj: the current GEM object
*
* Iterate over all the locked GEM objects inside the drm_exec object.
*/
#define drm_exec_for_each_locked_object(exec, index, obj) \
for ((index) = 0; ((obj) = drm_exec_obj(exec, index)); ++(index))
/**
* drm_exec_for_each_locked_object_reverse - iterate over all the locked
* objects in reverse locking order
* @exec: drm_exec object
* @index: unsigned long index for the iteration
* @obj: the current GEM object
*
* Iterate over all the locked GEM objects inside the drm_exec object in
* reverse locking order. Note that @index may go below zero and wrap,
* but that will be caught by drm_exec_obj(), returning a NULL object.
*/
#define drm_exec_for_each_locked_object_reverse(exec, index, obj) \
for ((index) = (exec)->num_objects - 1; \
((obj) = drm_exec_obj(exec, index)); --(index))
/**
* drm_exec_until_all_locked - loop until all GEM objects are locked
* @exec: drm_exec object
*
* Core functionality of the drm_exec object. Loops until all GEM objects are
* locked and no more contention exists. At the beginning of the loop it is
* guaranteed that no GEM object is locked.
*
* Since labels can't be defined local to the loops body we use a jump pointer
* to make sure that the retry is only used from within the loops body.
*/
#define drm_exec_until_all_locked(exec) \
__PASTE(__drm_exec_, __LINE__): \
for (void *__drm_exec_retry_ptr; ({ \
__drm_exec_retry_ptr = &&__PASTE(__drm_exec_, __LINE__);\
(void)__drm_exec_retry_ptr; \
drm_exec_cleanup(exec); \
});)
/**
* drm_exec_retry_on_contention - restart the loop to grap all locks
* @exec: drm_exec object
*
* Control flow helper to continue when a contention was detected and we need to
* clean up and re-start the loop to prepare all GEM objects.
*/
#define drm_exec_retry_on_contention(exec) \
do { \
if (unlikely(drm_exec_is_contended(exec))) \
goto *__drm_exec_retry_ptr; \
} while (0)
/**
* drm_exec_is_contended - check for contention
* @exec: drm_exec object
*
* Returns true if the drm_exec object has run into some contention while
* locking a GEM object and needs to clean up.
*/
static inline bool drm_exec_is_contended(struct drm_exec *exec)
{
return !!exec->contended;
}
void drm_exec_init(struct drm_exec *exec, uint32_t flags);
void drm_exec_fini(struct drm_exec *exec);
bool drm_exec_cleanup(struct drm_exec *exec);
int drm_exec_lock_obj(struct drm_exec *exec, struct drm_gem_object *obj);
void drm_exec_unlock_obj(struct drm_exec *exec, struct drm_gem_object *obj);
int drm_exec_prepare_obj(struct drm_exec *exec, struct drm_gem_object *obj,
unsigned int num_fences);
int drm_exec_prepare_array(struct drm_exec *exec,
struct drm_gem_object **objects,
unsigned int num_objects,
unsigned int num_fences);
#endif
|
