mirror of https://gitee.com/openkylin/linux.git
MIPS: Perf-events: Add callchain support
Adds callchain support for MIPS Perf-events. For more info on this feature, please refer to tools/perf/Documentation/perf-report.txt and tools/perf/design.txt. Currently userspace callchain data is not recorded, because we do not have a safe way to do this. Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> Acked-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Cc: a.p.zijlstra@chello.nl Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: jamie.iles@picochip.com Cc: matt@console-pimps.org Patchwork: https://patchwork.linux-mips.org/patch/1690/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -6,7 +6,8 @@
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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.
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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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@ -486,3 +487,108 @@ handle_associated_event(struct cpu_hw_events *cpuc,
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if (perf_event_overflow(event, 0, data, regs))
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mipspmu->disable_event(idx);
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}
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/* Callchain handling code. */
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static inline void
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callchain_store(struct perf_callchain_entry *entry,
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u64 ip)
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{
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if (entry->nr < PERF_MAX_STACK_DEPTH)
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entry->ip[entry->nr++] = ip;
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}
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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 add here.
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*/
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static void
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perf_callchain_user(struct pt_regs *regs,
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struct perf_callchain_entry *entry)
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{
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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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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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static void
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perf_callchain_kernel(struct pt_regs *regs,
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struct perf_callchain_entry *entry)
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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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callchain_store(entry, PERF_CONTEXT_KERNEL);
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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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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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callchain_store(entry, PERF_CONTEXT_KERNEL);
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save_raw_perf_callchain(entry, sp);
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#endif
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}
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static void
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perf_do_callchain(struct pt_regs *regs,
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struct perf_callchain_entry *entry)
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{
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int is_user;
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if (!regs)
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return;
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is_user = user_mode(regs);
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if (!current || !current->pid)
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return;
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if (is_user && current->state != TASK_RUNNING)
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return;
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if (!is_user) {
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perf_callchain_kernel(regs, entry);
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if (current->mm)
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regs = task_pt_regs(current);
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else
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regs = NULL;
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}
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if (regs)
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perf_callchain_user(regs, entry);
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}
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static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_irq_entry);
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struct perf_callchain_entry *
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perf_callchain(struct pt_regs *regs)
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{
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struct perf_callchain_entry *entry = &__get_cpu_var(pmc_irq_entry);
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entry->nr = 0;
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perf_do_callchain(regs, entry);
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return entry;
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}
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