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410e471f87
Currently, userstacktrace is unsupported for ftrace and uprobe tracers on arm64. This patch uses the perf_callchain_user() code as blueprint to implement the arch_stack_walk_user() which add userstacktrace support on arm64. Meanwhile, we can use arch_stack_walk_user() to simplify the implementation of perf_callchain_user(). This patch is tested pass with ftrace, uprobe and perf tracers profiling userstacktrace cases. Tested-by: chenqiwu <qiwu.chen@transsion.com> Signed-off-by: chenqiwu <qiwu.chen@transsion.com> Link: https://lore.kernel.org/r/20231219022229.10230-1-qiwu.chen@transsion.com Signed-off-by: Will Deacon <will@kernel.org>
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arm64 callchain support
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*
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* Copyright (C) 2015 ARM Limited
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*/
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#include <linux/perf_event.h>
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#include <linux/stacktrace.h>
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#include <linux/uaccess.h>
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#include <asm/pointer_auth.h>
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static bool callchain_trace(void *data, unsigned long pc)
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{
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struct perf_callchain_entry_ctx *entry = data;
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return perf_callchain_store(entry, pc) == 0;
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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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/* 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(callchain_trace, 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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/* We don't support guest os callchain now */
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return;
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}
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arch_stack_walk(callchain_trace, entry, current, regs);
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}
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unsigned long perf_instruction_pointer(struct pt_regs *regs)
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{
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if (perf_guest_state())
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return perf_guest_get_ip();
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return instruction_pointer(regs);
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}
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unsigned long perf_misc_flags(struct pt_regs *regs)
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{
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unsigned int guest_state = perf_guest_state();
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int misc = 0;
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if (guest_state) {
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if (guest_state & PERF_GUEST_USER)
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misc |= PERF_RECORD_MISC_GUEST_USER;
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else
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misc |= PERF_RECORD_MISC_GUEST_KERNEL;
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} else {
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if (user_mode(regs))
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misc |= PERF_RECORD_MISC_USER;
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else
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misc |= PERF_RECORD_MISC_KERNEL;
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}
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return misc;
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}
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