The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_pmc.c

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    1 /*-
    2  * Copyright (c) 2003-2005, Joseph Koshy
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    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.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/6.4/sys/kern/kern_pmc.c 149104 2005-08-15 18:46:13Z jkoshy $");
   28 
   29 #include "opt_hwpmc_hooks.h"
   30 
   31 #include <sys/types.h>
   32 #include <sys/pmc.h>
   33 #include <sys/pmckern.h>
   34 #include <sys/smp.h>
   35 
   36 #if     HWPMC_HOOKS
   37 #define PMC_KERNEL_VERSION      PMC_VERSION
   38 #else
   39 #define PMC_KERNEL_VERSION      0
   40 #endif
   41 
   42 const int pmc_kernel_version = PMC_KERNEL_VERSION;
   43 
   44 /* Hook variable. */
   45 int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL;
   46 
   47 /* Interrupt handler */
   48 int (*pmc_intr)(int cpu, uintptr_t pc, int usermode) = NULL;
   49 
   50 /* Bitmask of CPUs requiring servicing at hardclock time */
   51 volatile cpumask_t pmc_cpumask;
   52 
   53 /*
   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.
   56  */
   57 volatile int pmc_ss_count;
   58 
   59 /*
   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.
   63  *
   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.
   67  */
   68 struct sx pmc_sx;
   69 SX_SYSINIT(pmc, &pmc_sx, "pmc shared lock");
   70 
   71 /*
   72  * Helper functions
   73  */
   74 
   75 int
   76 pmc_cpu_is_disabled(int cpu)
   77 {
   78 #ifdef  SMP
   79         return ((hlt_cpus_mask & (1 << cpu)) != 0);
   80 #else
   81         return 0;
   82 #endif
   83 }
   84 
   85 int
   86 pmc_cpu_is_logical(int cpu)
   87 {
   88 #ifdef  SMP
   89         return ((logical_cpus_mask & (1 << cpu)) != 0);
   90 #else
   91         return 0;
   92 #endif
   93 }

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