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1 | /*- |
2 | * BSD LICENSE | |
3 | * | |
4 | * Copyright(c) 2015 Intel Corporation. All rights reserved. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * * Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * * Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * * Neither the name of Intel Corporation nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
24 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
25 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
26 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
27 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
31 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | /* | |
35 | * Some portions of this software is derived from the | |
36 | * https://github.com/halayli/lthread which carrys the following license. | |
37 | * | |
38 | * Copyright (C) 2012, Hasan Alayli <halayli@gmail.com> | |
39 | * | |
40 | * Redistribution and use in source and binary forms, with or without | |
41 | * modification, are permitted provided that the following conditions | |
42 | * are met: | |
43 | * 1. Redistributions of source code must retain the above copyright | |
44 | * notice, this list of conditions and the following disclaimer. | |
45 | * 2. Redistributions in binary form must reproduce the above copyright | |
46 | * notice, this list of conditions and the following disclaimer in the | |
47 | * documentation and/or other materials provided with the distribution. | |
48 | * | |
49 | * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
50 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
51 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
52 | * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE | |
53 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
54 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
55 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
56 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
57 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
58 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
59 | * SUCH DAMAGE. | |
60 | */ | |
61 | ||
62 | #ifndef LTHREAD_SCHED_H_ | |
63 | #define LTHREAD_SCHED_H_ | |
64 | ||
65 | #include "lthread_int.h" | |
66 | #include "lthread_queue.h" | |
67 | #include "lthread_objcache.h" | |
68 | #include "lthread_diag.h" | |
69 | #include "ctx.h" | |
70 | ||
71 | /* | |
72 | * insert an lthread into a queue | |
73 | */ | |
74 | static inline void | |
75 | _ready_queue_insert(struct lthread_sched *sched, struct lthread *lt) | |
76 | { | |
77 | if (sched == THIS_SCHED) | |
78 | _lthread_queue_insert_sp((THIS_SCHED)->ready, lt); | |
79 | else | |
80 | _lthread_queue_insert_mp(sched->pready, lt); | |
81 | } | |
82 | ||
83 | /* | |
84 | * remove an lthread from a queue | |
85 | */ | |
86 | static inline struct lthread *_ready_queue_remove(struct lthread_queue *q) | |
87 | { | |
88 | return _lthread_queue_remove(q); | |
89 | } | |
90 | ||
91 | /** | |
92 | * Return true if the ready queue is empty | |
93 | */ | |
94 | static inline int _ready_queue_empty(struct lthread_queue *q) | |
95 | { | |
96 | return _lthread_queue_empty(q); | |
97 | } | |
98 | ||
99 | static inline uint64_t _sched_now(void) | |
100 | { | |
101 | uint64_t now = rte_rdtsc(); | |
102 | ||
103 | if (now > (THIS_SCHED)->birth) | |
104 | return now - (THIS_SCHED)->birth; | |
105 | if (now < (THIS_SCHED)->birth) | |
106 | return (THIS_SCHED)->birth - now; | |
107 | /* never return 0 because this means sleep forever */ | |
108 | return 1; | |
109 | } | |
110 | ||
111 | static inline void | |
112 | _affinitize(void) __attribute__ ((always_inline)); | |
113 | static inline void | |
114 | _affinitize(void) | |
115 | { | |
116 | struct lthread *lt = THIS_LTHREAD; | |
117 | ||
118 | DIAG_EVENT(lt, LT_DIAG_LTHREAD_SUSPENDED, 0, 0); | |
119 | ctx_switch(&(THIS_SCHED)->ctx, <->ctx); | |
120 | } | |
121 | ||
122 | static inline void | |
123 | _suspend(void) __attribute__ ((always_inline)); | |
124 | static inline void | |
125 | _suspend(void) | |
126 | { | |
127 | struct lthread *lt = THIS_LTHREAD; | |
128 | ||
129 | (THIS_SCHED)->nb_blocked_threads++; | |
130 | DIAG_EVENT(lt, LT_DIAG_LTHREAD_SUSPENDED, 0, 0); | |
131 | ctx_switch(&(THIS_SCHED)->ctx, <->ctx); | |
132 | (THIS_SCHED)->nb_blocked_threads--; | |
133 | } | |
134 | ||
135 | static inline void | |
136 | _reschedule(void) __attribute__ ((always_inline)); | |
137 | static inline void | |
138 | _reschedule(void) | |
139 | { | |
140 | struct lthread *lt = THIS_LTHREAD; | |
141 | ||
142 | DIAG_EVENT(lt, LT_DIAG_LTHREAD_RESCHEDULED, 0, 0); | |
143 | _ready_queue_insert(THIS_SCHED, lt); | |
144 | ctx_switch(&(THIS_SCHED)->ctx, <->ctx); | |
145 | } | |
146 | ||
147 | extern struct lthread_sched *schedcore[]; | |
148 | void _sched_timer_cb(struct rte_timer *tim, void *arg); | |
149 | void _sched_shutdown(__rte_unused void *arg); | |
150 | ||
151 | ||
152 | #endif /* LTHREAD_SCHED_H_ */ |