Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. */
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#include <linux/perf_event.h>
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#include <linux/uaccess.h>
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#include <asm/stacktrace.h>
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static bool fill_callchain(void *entry, unsigned long pc)
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{
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return perf_callchain_store(entry, pc) == 0;
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}
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/*
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* This will be called when the target is in user mode
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* This function will only be called when we use
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* "PERF_SAMPLE_CALLCHAIN" in
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* kernel/events/core.c:perf_prepare_sample()
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*
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* How to trigger perf_callchain_[user/kernel] :
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* $ perf record -e cpu-clock --call-graph fp ./program
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* $ perf report --call-graph
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*
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* On RISC-V platform, the program being sampled and the C library
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* need to be compiled with -fno-omit-frame-pointer, otherwise
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* the user stack will not contain function frame.
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*/
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void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
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struct pt_regs *regs)
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{
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if (perf_guest_state()) {
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/* TODO: We don't support guest os callchain now */
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return;
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}
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arch_stack_walk_user(fill_callchain, entry, regs);
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}
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void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
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struct pt_regs *regs)
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{
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if (perf_guest_state()) {
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/* TODO: We don't support guest os callchain now */
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return;
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}
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walk_stackframe(NULL, regs, fill_callchain, entry);
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}
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