Commit daac95e7 authored by Mao Han's avatar Mao Han Committed by Guo Ren
Browse files

csky: Add support for perf registers sampling 



This patch implements the perf registers sampling and validation API
for csky arch. The valid registers and their register ID are defined in
perf_regs.h. Perf tool can backtrace in userspace with unwind library
and the registers/user stack dump support.

Signed-off-by: default avatarMao Han <han_mao@c-sky.com>
Signed-off-by: default avatarGuo Ren <ren_guo@c-sky.com>
parent 0eaf50de

arch/csky/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -38,6 +38,8 @@ config CSKY 
	select HAVE_KERNEL_LZO

	select HAVE_KERNEL_LZMA

	select HAVE_PERF_EVENTS

	select HAVE_PERF_REGS

	select HAVE_PERF_USER_STACK_DUMP

	select HAVE_DMA_API_DEBUG

	select HAVE_DMA_CONTIGUOUS

	select HAVE_SYSCALL_TRACEPOINTS

arch/csky/include/uapi/asm/perf_regs.h

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+51 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.



#ifndef _ASM_CSKY_PERF_REGS_H

#define _ASM_CSKY_PERF_REGS_H



/* Index of struct pt_regs */

enum perf_event_csky_regs {

	PERF_REG_CSKY_TLS,

	PERF_REG_CSKY_LR,

	PERF_REG_CSKY_PC,

	PERF_REG_CSKY_SR,

	PERF_REG_CSKY_SP,

	PERF_REG_CSKY_ORIG_A0,

	PERF_REG_CSKY_A0,

	PERF_REG_CSKY_A1,

	PERF_REG_CSKY_A2,

	PERF_REG_CSKY_A3,

	PERF_REG_CSKY_REGS0,

	PERF_REG_CSKY_REGS1,

	PERF_REG_CSKY_REGS2,

	PERF_REG_CSKY_REGS3,

	PERF_REG_CSKY_REGS4,

	PERF_REG_CSKY_REGS5,

	PERF_REG_CSKY_REGS6,

	PERF_REG_CSKY_REGS7,

	PERF_REG_CSKY_REGS8,

	PERF_REG_CSKY_REGS9,

#if defined(__CSKYABIV2__)

	PERF_REG_CSKY_EXREGS0,

	PERF_REG_CSKY_EXREGS1,

	PERF_REG_CSKY_EXREGS2,

	PERF_REG_CSKY_EXREGS3,

	PERF_REG_CSKY_EXREGS4,

	PERF_REG_CSKY_EXREGS5,

	PERF_REG_CSKY_EXREGS6,

	PERF_REG_CSKY_EXREGS7,

	PERF_REG_CSKY_EXREGS8,

	PERF_REG_CSKY_EXREGS9,

	PERF_REG_CSKY_EXREGS10,

	PERF_REG_CSKY_EXREGS11,

	PERF_REG_CSKY_EXREGS12,

	PERF_REG_CSKY_EXREGS13,

	PERF_REG_CSKY_EXREGS14,

	PERF_REG_CSKY_HI,

	PERF_REG_CSKY_LO,

	PERF_REG_CSKY_DCSR,

#endif

	PERF_REG_CSKY_MAX,

};

#endif /* _ASM_CSKY_PERF_REGS_H */

arch/csky/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o 
obj-$(CONFIG_STACKTRACE)		+= stacktrace.o

obj-$(CONFIG_CSKY_PMU_V1)		+= perf_event.o

obj-$(CONFIG_PERF_EVENTS)		+= perf_callchain.o

obj-$(CONFIG_HAVE_PERF_REGS)            += perf_regs.o



ifdef CONFIG_FUNCTION_TRACER

CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)

arch/csky/kernel/perf_regs.c

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// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.



#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/perf_event.h>

#include <linux/bug.h>

#include <asm/perf_regs.h>

#include <asm/ptrace.h>



u64 perf_reg_value(struct pt_regs *regs, int idx)

{

	if (WARN_ON_ONCE((u32)idx >= PERF_REG_CSKY_MAX))

		return 0;



	return (u64)*((u32 *)regs + idx);

}



#define REG_RESERVED (~((1ULL << PERF_REG_CSKY_MAX) - 1))



int perf_reg_validate(u64 mask)

{

	if (!mask || mask & REG_RESERVED)

		return -EINVAL;



	return 0;

}



u64 perf_reg_abi(struct task_struct *task)

{

	return PERF_SAMPLE_REGS_ABI_32;

}



void perf_get_regs_user(struct perf_regs *regs_user,

			struct pt_regs *regs,

			struct pt_regs *regs_user_copy)

{

	regs_user->regs = task_pt_regs(current);

	regs_user->abi = perf_reg_abi(current);

}

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