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1 /*-
2  * Copyright (c) 2003, Joseph Koshy
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28
29 /*
30  * PMC interface used by the base kernel.
31  */
32
33 #ifndef _SYS_PMCKERN_H_
34 #define _SYS_PMCKERN_H_
35
36 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/lock.h>
39 #include <sys/proc.h>
40 #include <sys/sx.h>
41
42 #define PMC_FN_PROCESS_EXIT             1
43 #define PMC_FN_PROCESS_EXEC             2
44 #define PMC_FN_PROCESS_FORK             3
45 #define PMC_FN_CSW_IN                   4
46 #define PMC_FN_CSW_OUT                  5
47
48 /* hook */
49 extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
50 extern int (*pmc_intr)(int cpu, uintptr_t pc);
51
52 /* SX lock protecting the hook */
53 extern struct sx pmc_sx;
54
55 /* hook invocation; for use within the kernel */
56 #define PMC_CALL_HOOK(t, cmd, arg)              \
57 do {                                            \
58         sx_slock(&pmc_sx);                      \
59         if (pmc_hook != NULL)                   \
60                 (pmc_hook)((t), (cmd), (arg));  \
61         sx_sunlock(&pmc_sx);                    \
62 } while (0)
63
64 /* hook invocation that needs an exclusive lock */
65 #define PMC_CALL_HOOK_X(t, cmd, arg)            \
66 do {                                            \
67         sx_xlock(&pmc_sx);                      \
68         if (pmc_hook != NULL)                   \
69                 (pmc_hook)((t), (cmd), (arg));  \
70         sx_xunlock(&pmc_sx);                    \
71 } while (0)
72
73 /* context switches cannot take locks */
74 #define PMC_SWITCH_CONTEXT(t, cmd)              \
75 do {                                            \
76         if (pmc_hook != NULL)                   \
77                 (pmc_hook)((t), (cmd), NULL);   \
78 } while (0)
79
80
81 /*
82  * check if a process is using HWPMCs.
83  */
84
85 #define PMC_PROC_IS_USING_PMCS(p)                               \
86         (__predict_false(atomic_load_acq_int(&(p)->p_flag) &    \
87             P_HWPMC))
88
89 /* helper functions */
90 int     pmc_cpu_is_disabled(int _cpu);
91 int     pmc_cpu_is_logical(int _cpu);
92
93 #endif /* _SYS_PMCKERN_H_ */