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Linux/arch/mips/kernel/perf_event.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Linux performance counter support for MIPS.
  4  *
  5  * Copyright (C) 2010 MIPS Technologies, Inc.
  6  * Author: Deng-Cheng Zhu
  7  *
  8  * This code is based on the implementation for ARM, which is in turn
  9  * based on the sparc64 perf event code and the x86 code. Performance
 10  * counter access is based on the MIPS Oprofile code. And the callchain
 11  * support references the code of MIPS stacktrace.c.
 12  */
 13 
 14 #include <linux/perf_event.h>
 15 #include <linux/sched/task_stack.h>
 16 
 17 #include <asm/stacktrace.h>
 18 
 19 /* Callchain handling code. */
 20 
 21 /*
 22  * Leave userspace callchain empty for now. When we find a way to trace
 23  * the user stack callchains, we will add it here.
 24  */
 25 
 26 static void save_raw_perf_callchain(struct perf_callchain_entry_ctx *entry,
 27                                     unsigned long reg29)
 28 {
 29         unsigned long *sp = (unsigned long *)reg29;
 30         unsigned long addr;
 31 
 32         while (!kstack_end(sp)) {
 33                 addr = *sp++;
 34                 if (__kernel_text_address(addr)) {
 35                         perf_callchain_store(entry, addr);
 36                         if (entry->nr >= entry->max_stack)
 37                                 break;
 38                 }
 39         }
 40 }
 41 
 42 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
 43                            struct pt_regs *regs)
 44 {
 45         unsigned long sp = regs->regs[29];
 46 #ifdef CONFIG_KALLSYMS
 47         unsigned long ra = regs->regs[31];
 48         unsigned long pc = regs->cp0_epc;
 49 
 50         if (raw_show_trace || !__kernel_text_address(pc)) {
 51                 unsigned long stack_page =
 52                         (unsigned long)task_stack_page(current);
 53                 if (stack_page && sp >= stack_page &&
 54                     sp <= stack_page + THREAD_SIZE - 32)
 55                         save_raw_perf_callchain(entry, sp);
 56                 return;
 57         }
 58         do {
 59                 perf_callchain_store(entry, pc);
 60                 if (entry->nr >= entry->max_stack)
 61                         break;
 62                 pc = unwind_stack(current, &sp, pc, &ra);
 63         } while (pc);
 64 #else
 65         save_raw_perf_callchain(entry, sp);
 66 #endif
 67 }
 68 

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