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/sys/pmckern.h

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    1 /*-
    2  * Copyright (c) 2003-2007, Joseph Koshy
    3  * Copyright (c) 2007 The FreeBSD Foundation
    4  * All rights reserved.
    5  *
    6  * Portions of this software were developed by A. Joseph Koshy under
    7  * sponsorship from the FreeBSD Foundation and Google, Inc.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/8.0/sys/sys/pmckern.h 183266 2008-09-22 10:37:02Z jkoshy $
   31  */
   32 
   33 /*
   34  * PMC interface used by the base kernel.
   35  */
   36 
   37 #ifndef _SYS_PMCKERN_H_
   38 #define _SYS_PMCKERN_H_
   39 
   40 #include <sys/param.h>
   41 #include <sys/kernel.h>
   42 #include <sys/lock.h>
   43 #include <sys/proc.h>
   44 #include <sys/sx.h>
   45 
   46 #define PMC_FN_PROCESS_EXEC             1
   47 #define PMC_FN_CSW_IN                   2
   48 #define PMC_FN_CSW_OUT                  3
   49 #define PMC_FN_DO_SAMPLES               4
   50 #define PMC_FN_KLD_LOAD                 5
   51 #define PMC_FN_KLD_UNLOAD               6
   52 #define PMC_FN_MMAP                     7
   53 #define PMC_FN_MUNMAP                   8
   54 #define PMC_FN_USER_CALLCHAIN           9
   55 
   56 struct pmckern_procexec {
   57         int             pm_credentialschanged;
   58         uintfptr_t      pm_entryaddr;
   59 };
   60 
   61 struct pmckern_map_in {
   62         void            *pm_file;       /* filename or vnode pointer */
   63         uintfptr_t      pm_address;     /* address object is loaded at */
   64 };
   65 
   66 struct pmckern_map_out {
   67         uintfptr_t      pm_address;     /* start address of region */
   68         size_t          pm_size;        /* size of unmapped region */
   69 };
   70 
   71 /* hook */
   72 extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
   73 extern int (*pmc_intr)(int _cpu, struct trapframe *_frame);
   74 
   75 /* SX lock protecting the hook */
   76 extern struct sx pmc_sx;
   77 
   78 /* Per-cpu flags indicating availability of sampling data */
   79 extern volatile cpumask_t pmc_cpumask;
   80 
   81 /* Count of system-wide sampling PMCs in existence */
   82 extern volatile int pmc_ss_count;
   83 
   84 /* kernel version number */
   85 extern const int pmc_kernel_version;
   86 
   87 /* Hook invocation; for use within the kernel */
   88 #define PMC_CALL_HOOK(t, cmd, arg)              \
   89 do {                                            \
   90         sx_slock(&pmc_sx);                      \
   91         if (pmc_hook != NULL)                   \
   92                 (pmc_hook)((t), (cmd), (arg));  \
   93         sx_sunlock(&pmc_sx);                    \
   94 } while (0)
   95 
   96 /* Hook invocation that needs an exclusive lock */
   97 #define PMC_CALL_HOOK_X(t, cmd, arg)            \
   98 do {                                            \
   99         sx_xlock(&pmc_sx);                      \
  100         if (pmc_hook != NULL)                   \
  101                 (pmc_hook)((t), (cmd), (arg));  \
  102         sx_xunlock(&pmc_sx);                    \
  103 } while (0)
  104 
  105 /*
  106  * Some hook invocations (e.g., from context switch and clock handling
  107  * code) need to be lock-free.
  108  */
  109 #define PMC_CALL_HOOK_UNLOCKED(t, cmd, arg)     \
  110 do {                                            \
  111         if (pmc_hook != NULL)                   \
  112                 (pmc_hook)((t), (cmd), (arg));  \
  113 } while (0)
  114 
  115 #define PMC_SWITCH_CONTEXT(t,cmd)       PMC_CALL_HOOK_UNLOCKED(t,cmd,NULL)
  116 
  117 /* Check if a process is using HWPMCs.*/
  118 #define PMC_PROC_IS_USING_PMCS(p)                               \
  119         (__predict_false(atomic_load_acq_int(&(p)->p_flag) &    \
  120             P_HWPMC))
  121 
  122 #define PMC_SYSTEM_SAMPLING_ACTIVE()            (pmc_ss_count > 0)
  123 
  124 /* Check if a CPU has recorded samples. */
  125 #define PMC_CPU_HAS_SAMPLES(C)  (__predict_false(pmc_cpumask & (1 << (C))))
  126 
  127 /*
  128  * Helper functions.
  129  */
  130 int             pmc_cpu_is_disabled(int _cpu);  /* deprecated */
  131 int             pmc_cpu_is_active(int _cpu);
  132 int             pmc_cpu_is_present(int _cpu);
  133 int             pmc_cpu_is_primary(int _cpu);
  134 unsigned int    pmc_cpu_max(void);
  135 
  136 #ifdef  INVARIANTS
  137 int             pmc_cpu_max_active(void);
  138 #endif
  139 
  140 #endif /* _SYS_PMCKERN_H_ */

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