73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2020 MediaTek Inc.
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*/
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#include <linux/types.h>
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#include <linux/tracepoint.h>
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#include <linux/tracepoint-defs.h>
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#include <linux/string.h>
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#include "apu_tp.h"
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#define apu_tp_foreach(tbl, t) \
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for ((t) = (tbl); (t)->name != NULL; (t)++)
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static void apu_tp_lookup(struct tracepoint *tp, void *priv)
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{
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struct apu_tp_tbl *t, *tbl;
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tbl = (struct apu_tp_tbl *)priv;
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apu_tp_foreach(tbl, t) {
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if (!strcmp(t->name, tp->name))
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t->tp = tp;
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}
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}
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/**
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* apu_tp_exit() - Release trace point table
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*
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* @apu_tp_tbl: trace point table
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*
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* Unregister all trace points listed in the given table from kernel.
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* Note: The last entry of the table must be "APU_TP_TBL_END".
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*/
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void apu_tp_exit(struct apu_tp_tbl *tbl)
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{
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struct apu_tp_tbl *t;
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apu_tp_foreach(tbl, t) {
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if (!t->tp)
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continue;
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tracepoint_probe_unregister(t->tp, t->func, NULL);
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t->registered = false;
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}
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}
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/**
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* apu_tp_init() - Initialize trace point table
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*
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* @apu_tp_tbl: trace point table
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*
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* Register all trace points listed in the given table to kernel.
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* Note: The last entry of the table must be "APU_TP_TBL_END".
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*/
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int apu_tp_init(struct apu_tp_tbl *tbl)
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{
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struct apu_tp_tbl *t;
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/* install tracepoints */
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for_each_kernel_tracepoint(apu_tp_lookup, tbl);
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apu_tp_foreach(tbl, t) {
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if (!t->tp) {
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pr_info("%s: %s was not found\n", __func__, t->name);
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apu_tp_exit(tbl); /* free registered entries */
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return -EINVAL;
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}
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tracepoint_probe_register(t->tp, t->func, NULL);
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t->registered = true;
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}
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return 0;
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}
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