1 /*
2  * SPDX-License-Identifier: MIT
3  *
4  * Copyright © 2018 Intel Corporation
5  */
6 
7 #ifndef _I915_SCHEDULER_H_
8 #define _I915_SCHEDULER_H_
9 
10 #include <linux/bitops.h>
11 #include <linux/list.h>
12 #include <linux/kernel.h>
13 
14 #include "i915_scheduler_types.h"
15 #include "i915_tasklet.h"
16 
17 struct drm_printer;
18 
19 #define priolist_for_each_request(it, plist) \
20 	list_for_each_entry(it, &(plist)->requests, sched.link)
21 
22 #define priolist_for_each_request_consume(it, n, plist) \
23 	list_for_each_entry_safe(it, n, &(plist)->requests, sched.link)
24 
25 void i915_sched_node_init(struct i915_sched_node *node);
26 void i915_sched_node_reinit(struct i915_sched_node *node);
27 
28 bool __i915_sched_node_add_dependency(struct i915_sched_node *node,
29 				      struct i915_sched_node *signal,
30 				      struct i915_dependency *dep,
31 				      unsigned long flags);
32 
33 int i915_sched_node_add_dependency(struct i915_sched_node *node,
34 				   struct i915_sched_node *signal,
35 				   unsigned long flags);
36 
37 void i915_sched_node_fini(struct i915_sched_node *node);
38 
39 void i915_schedule(struct i915_request *request,
40 		   const struct i915_sched_attr *attr);
41 
42 struct list_head *
43 i915_sched_lookup_priolist(struct i915_sched_engine *sched_engine, int prio);
44 
45 void __i915_priolist_free(struct i915_priolist *p);
46 static inline void i915_priolist_free(struct i915_priolist *p)
47 {
48 	if (p->priority != I915_PRIORITY_NORMAL)
49 		__i915_priolist_free(p);
50 }
51 
52 struct i915_sched_engine *
53 i915_sched_engine_create(unsigned int subclass);
54 
55 static inline struct i915_sched_engine *
56 i915_sched_engine_get(struct i915_sched_engine *sched_engine)
57 {
58 	kref_get(&sched_engine->ref);
59 	return sched_engine;
60 }
61 
62 static inline void
63 i915_sched_engine_put(struct i915_sched_engine *sched_engine)
64 {
65 	kref_put(&sched_engine->ref, sched_engine->destroy);
66 }
67 
68 static inline bool
69 i915_sched_engine_is_empty(struct i915_sched_engine *sched_engine)
70 {
71 	return RB_EMPTY_ROOT(&sched_engine->queue.rb_root);
72 }
73 
74 static inline void
75 i915_sched_engine_reset_on_empty(struct i915_sched_engine *sched_engine)
76 {
77 	if (i915_sched_engine_is_empty(sched_engine))
78 		sched_engine->no_priolist = false;
79 }
80 
81 static inline void
82 i915_sched_engine_active_lock_bh(struct i915_sched_engine *sched_engine)
83 {
84 	local_bh_disable(); /* prevent local softirq and lock recursion */
85 	tasklet_lock(&sched_engine->tasklet);
86 }
87 
88 static inline void
89 i915_sched_engine_active_unlock_bh(struct i915_sched_engine *sched_engine)
90 {
91 	tasklet_unlock(&sched_engine->tasklet);
92 	local_bh_enable(); /* restore softirq, and kick ksoftirqd! */
93 }
94 
95 void i915_request_show_with_schedule(struct drm_printer *m,
96 				     const struct i915_request *rq,
97 				     const char *prefix,
98 				     int indent);
99 
100 static inline bool
101 i915_sched_engine_disabled(struct i915_sched_engine *sched_engine)
102 {
103 	return sched_engine->disabled(sched_engine);
104 }
105 
106 void i915_scheduler_module_exit(void);
107 int i915_scheduler_module_init(void);
108 
109 #endif /* _I915_SCHEDULER_H_ */
110