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) 2003-2006, 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_EXEC             1
   43 #define PMC_FN_CSW_IN                   2
   44 #define PMC_FN_CSW_OUT                  3
   45 #define PMC_FN_DO_SAMPLES               4
   46 #define PMC_FN_KLD_LOAD                 5
   47 #define PMC_FN_KLD_UNLOAD               6
   48 #define PMC_FN_MMAP                     7
   49 #define PMC_FN_MUNMAP                   8
   50 
   51 struct pmckern_procexec {
   52         int             pm_credentialschanged;
   53         uintfptr_t      pm_entryaddr;
   54 };
   55 
   56 struct pmckern_map_in {
   57         void            *pm_file;       /* filename or vnode pointer */
   58         uintfptr_t      pm_address;     /* address object is loaded at */
   59 };
   60 
   61 struct pmckern_map_out {
   62         uintfptr_t      pm_address;     /* start address of region */
   63         size_t          pm_size;        /* size of unmapped region */
   64 };
   65 
   66 /* hook */
   67 extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
   68 extern int (*pmc_intr)(int _cpu, uintptr_t _pc, int _usermode);
   69 
   70 /* SX lock protecting the hook */
   71 extern struct sx pmc_sx;
   72 
   73 /* Per-cpu flags indicating availability of sampling data */
   74 extern volatile cpumask_t pmc_cpumask;
   75 
   76 /* Count of system-wide sampling PMCs in existence */
   77 extern volatile int pmc_ss_count;
   78 
   79 /* kernel version number */
   80 extern const int pmc_kernel_version;
   81 
   82 /* Hook invocation; for use within the kernel */
   83 #define PMC_CALL_HOOK(t, cmd, arg)              \
   84 do {                                            \
   85         sx_slock(&pmc_sx);                      \
   86         if (pmc_hook != NULL)                   \
   87                 (pmc_hook)((t), (cmd), (arg));  \
   88         sx_sunlock(&pmc_sx);                    \
   89 } while (0)
   90 
   91 /* Hook invocation that needs an exclusive lock */
   92 #define PMC_CALL_HOOK_X(t, cmd, arg)            \
   93 do {                                            \
   94         sx_xlock(&pmc_sx);                      \
   95         if (pmc_hook != NULL)                   \
   96                 (pmc_hook)((t), (cmd), (arg));  \
   97         sx_xunlock(&pmc_sx);                    \
   98 } while (0)
   99 
  100 /*
  101  * Some hook invocations (e.g., from context switch and clock handling
  102  * code) need to be lock-free.
  103  */
  104 #define PMC_CALL_HOOK_UNLOCKED(t, cmd, arg)     \
  105 do {                                            \
  106         if (pmc_hook != NULL)                   \
  107                 (pmc_hook)((t), (cmd), (arg));  \
  108 } while (0)
  109 
  110 #define PMC_SWITCH_CONTEXT(t,cmd)       PMC_CALL_HOOK_UNLOCKED(t,cmd,NULL)
  111 
  112 /* Check if a process is using HWPMCs.*/
  113 #define PMC_PROC_IS_USING_PMCS(p)                               \
  114         (__predict_false(atomic_load_acq_int(&(p)->p_flag) &    \
  115             P_HWPMC))
  116 
  117 #define PMC_SYSTEM_SAMPLING_ACTIVE()            (pmc_ss_count > 0)
  118 
  119 /* Check if a CPU has recorded samples. */
  120 #define PMC_CPU_HAS_SAMPLES(C)  (__predict_false(pmc_cpumask & (1 << (C))))
  121 
  122 /* helper functions */
  123 int     pmc_cpu_is_disabled(int _cpu);
  124 int     pmc_cpu_is_logical(int _cpu);
  125 
  126 #endif /* _SYS_PMCKERN_H_ */

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