forked from luck/tmp_suning_uos_patched
e5dcb58aa5
The contents of arch/mips/kernel/perf_event.c and arch/mips/kernel/perf_event_mipsxx.c were divided in a seemingly ad hoc manner, with the first including the second. I moved all the hardware counter support code to perf_event_mipsxx.c and removed the gating #ifdefs to the Kconfig and Makefile. Now perf_event.c contains only the callchain support, everything else is in perf_event_mipsxx.c There are no code changes, only moving of functions from one file to the other, or removing empty unneeded functions. Signed-off-by: David Daney <david.daney@cavium.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Dezhong Diao <dediao@cisco.com> Cc: Gabor Juhos <juhosg@openwrt.org> Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/2791/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* Linux performance counter support for MIPS.
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*
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* Copyright (C) 2010 MIPS Technologies, Inc.
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* Author: Deng-Cheng Zhu
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*
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* This code is based on the implementation for ARM, which is in turn
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* based on the sparc64 perf event code and the x86 code. Performance
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* counter access is based on the MIPS Oprofile code. And the callchain
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* support references the code of MIPS stacktrace.c.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/perf_event.h>
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#include <asm/stacktrace.h>
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/* Callchain handling code. */
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/*
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* Leave userspace callchain empty for now. When we find a way to trace
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* the user stack callchains, we will add it here.
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*/
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static void save_raw_perf_callchain(struct perf_callchain_entry *entry,
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unsigned long reg29)
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{
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unsigned long *sp = (unsigned long *)reg29;
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unsigned long addr;
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while (!kstack_end(sp)) {
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addr = *sp++;
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if (__kernel_text_address(addr)) {
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perf_callchain_store(entry, addr);
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if (entry->nr >= PERF_MAX_STACK_DEPTH)
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break;
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}
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}
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}
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void perf_callchain_kernel(struct perf_callchain_entry *entry,
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struct pt_regs *regs)
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{
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unsigned long sp = regs->regs[29];
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#ifdef CONFIG_KALLSYMS
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unsigned long ra = regs->regs[31];
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unsigned long pc = regs->cp0_epc;
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if (raw_show_trace || !__kernel_text_address(pc)) {
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unsigned long stack_page =
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(unsigned long)task_stack_page(current);
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if (stack_page && sp >= stack_page &&
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sp <= stack_page + THREAD_SIZE - 32)
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save_raw_perf_callchain(entry, sp);
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return;
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}
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do {
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perf_callchain_store(entry, pc);
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if (entry->nr >= PERF_MAX_STACK_DEPTH)
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break;
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pc = unwind_stack(current, &sp, pc, &ra);
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} while (pc);
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#else
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save_raw_perf_callchain(entry, sp);
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#endif
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}
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