1 /*
2  * SPDX-License-Identifier: MIT
3  *
4  * Copyright © 2018 Intel Corporation
5  */
6 
7 #ifndef _I915_PRIOLIST_TYPES_H_
8 #define _I915_PRIOLIST_TYPES_H_
9 
10 #include <linux/list.h>
11 #include <linux/rbtree.h>
12 
13 #include <uapi/drm/i915_drm.h>
14 
15 enum {
16 	I915_PRIORITY_MIN = I915_CONTEXT_MIN_USER_PRIORITY - 1,
17 	I915_PRIORITY_NORMAL = I915_CONTEXT_DEFAULT_PRIORITY,
18 	I915_PRIORITY_MAX = I915_CONTEXT_MAX_USER_PRIORITY + 1,
19 
20 	/* A preemptive pulse used to monitor the health of each engine */
21 	I915_PRIORITY_HEARTBEAT,
22 
23 	/* Interactive workload, scheduled for immediate pageflipping */
24 	I915_PRIORITY_DISPLAY,
25 };
26 
27 /* Smallest priority value that cannot be bumped. */
28 #define I915_PRIORITY_INVALID (INT_MIN)
29 
30 /*
31  * Requests containing performance queries must not be preempted by
32  * another context. They get scheduled with their default priority and
33  * once they reach the execlist ports we ensure that they stick on the
34  * HW until finished by pretending that they have maximum priority,
35  * i.e. nothing can have higher priority and force us to usurp the
36  * active request.
37  */
38 #define I915_PRIORITY_UNPREEMPTABLE INT_MAX
39 #define I915_PRIORITY_BARRIER (I915_PRIORITY_UNPREEMPTABLE - 1)
40 
41 struct i915_priolist {
42 	struct list_head requests;
43 	struct rb_node node;
44 	int priority;
45 };
46 
47 #endif /* _I915_PRIOLIST_TYPES_H_ */
48