118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* auxtrace.h: AUX area trace support
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* Copyright (c) 2013-2015, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#ifndef __PERF_AUXTRACE_H
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#define __PERF_AUXTRACE_H
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#include <sys/types.h>
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#include <stdbool.h>
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#include <linux/perf_event.h>
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#include <linux/types.h>
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#include "../perf.h"
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struct perf_evlist;
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/**
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* struct auxtrace_mmap - records an mmap of the auxtrace buffer.
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* @base: address of mapped area
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* @userpg: pointer to buffer's perf_event_mmap_page
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* @mask: %0 if @len is not a power of two, otherwise (@len - %1)
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* @len: size of mapped area
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* @prev: previous aux_head
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* @idx: index of this mmap
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* @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
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* mmap) otherwise %0
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* @cpu: cpu number for a per-cpu mmap otherwise %-1
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*/
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struct auxtrace_mmap {
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void *base;
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void *userpg;
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size_t mask;
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size_t len;
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u64 prev;
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int idx;
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pid_t tid;
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int cpu;
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};
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/**
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* struct auxtrace_mmap_params - parameters to set up struct auxtrace_mmap.
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* @mask: %0 if @len is not a power of two, otherwise (@len - %1)
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* @offset: file offset of mapped area
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* @len: size of mapped area
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* @prot: mmap memory protection
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* @idx: index of this mmap
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* @tid: tid for a per-thread mmap (also set if there is only 1 tid on a per-cpu
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* mmap) otherwise %0
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* @cpu: cpu number for a per-cpu mmap otherwise %-1
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*/
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struct auxtrace_mmap_params {
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size_t mask;
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off_t offset;
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size_t len;
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int prot;
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int idx;
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pid_t tid;
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int cpu;
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};
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static inline u64 auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
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{
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struct perf_event_mmap_page *pc = mm->userpg;
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#if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
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u64 head = ACCESS_ONCE(pc->aux_head);
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#else
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u64 head = __sync_val_compare_and_swap(&pc->aux_head, 0, 0);
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#endif
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/* Ensure all reads are done after we read the head */
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rmb();
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return head;
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}
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static inline void auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
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{
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struct perf_event_mmap_page *pc = mm->userpg;
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#if BITS_PER_LONG != 64 && defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
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u64 old_tail;
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#endif
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/* Ensure all reads are done before we write the tail out */
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mb();
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#if BITS_PER_LONG == 64 || !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
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pc->aux_tail = tail;
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#else
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do {
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old_tail = __sync_val_compare_and_swap(&pc->aux_tail, 0, 0);
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} while (!__sync_bool_compare_and_swap(&pc->aux_tail, old_tail, tail));
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#endif
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}
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int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
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struct auxtrace_mmap_params *mp,
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void *userpg, int fd);
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void auxtrace_mmap__munmap(struct auxtrace_mmap *mm);
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void auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp,
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off_t auxtrace_offset,
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unsigned int auxtrace_pages,
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bool auxtrace_overwrite);
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void auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp,
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struct perf_evlist *evlist, int idx,
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bool per_cpu);
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#endif
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