2 * Copyright (c) 2003-2005, Joseph Koshy
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include "opt_hwpmc_hooks.h"
31 #include <sys/types.h>
33 #include <sys/pmckern.h>
37 #define PMC_KERNEL_VERSION PMC_VERSION
39 #define PMC_KERNEL_VERSION 0
42 const int pmc_kernel_version = PMC_KERNEL_VERSION;
45 int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL;
47 /* Interrupt handler */
48 int (*pmc_intr)(int cpu, uintptr_t pc, int usermode) = NULL;
50 /* Bitmask of CPUs requiring servicing at hardclock time */
51 volatile cpumask_t pmc_cpumask;
54 * A global count of SS mode PMCs. When non-zero, this means that
55 * we have processes that are sampling the system as a whole.
57 volatile int pmc_ss_count;
60 * Since PMC(4) may not be loaded in the current kernel, the
61 * convention followed is that a non-NULL value of 'pmc_hook' implies
62 * the presence of this kernel module.
64 * This requires us to protect 'pmc_hook' with a
65 * shared (sx) lock -- thus making the process of calling into PMC(4)
66 * somewhat more expensive than a simple 'if' check and indirect call.
69 SX_SYSINIT(pmc, &pmc_sx, "pmc shared lock");
76 pmc_cpu_is_disabled(int cpu)
79 return ((hlt_cpus_mask & (1 << cpu)) != 0);
86 pmc_cpu_is_logical(int cpu)
89 return ((logical_cpus_mask & (1 << cpu)) != 0);