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csky: Add support for perf registers sampling

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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: Mao Han <han_mao@c-sky.com>
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
This commit is contained in:
Mao Han 2019-04-15 17:17:29 +08:00 committed by Guo Ren
parent 0eaf50deec
commit daac95e70f
4 changed files with 94 additions and 0 deletions
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2
arch/csky/Kconfig
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@ -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

51
arch/csky/include/uapi/asm/perf_regs.h Normal file
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@ -0,0 +1,51 @@
/* 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 */

1
arch/csky/kernel/Makefile
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@ -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)

40
arch/csky/kernel/perf_regs.c Normal file
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@ -0,0 +1,40 @@
// 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);
}