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Message-ID: <CAAhV-H69EHXx54Btm0JXSdJ+WJxfqWr_KzcD-Cpq1ph6z9WWug@mail.gmail.com>
Date: Mon, 3 Apr 2023 08:54:36 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Donglin Peng <pengdonglin@...gfor.com.cn>
Cc: mhiramat@...nel.org, rostedt@...dmis.org, linux@...linux.org.uk,
mark.rutland@....com, will@...nel.org, catalin.marinas@....com,
rmk+kernel@...linux.org.uk, palmer@...belt.com,
paul.walmsley@...ive.com, aou@...s.berkeley.edu,
tglx@...utronix.de, dave.hansen@...ux.intel.com, x86@...nel.org,
bp@...en8.de, hpa@...or.com, zhangqing@...ngson.cn,
kernel@...0n.name, mingo@...hat.com, peterz@...radead.org,
xiehuan09@...il.com, dinghui@...gfor.com.cn,
huangcun@...gfor.com.cn, dolinux.peng@...il.com,
linux-trace-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
linux-riscv@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 7/8] LoongArch: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL
Reviewed-by: Huacai Chen <chenhuacai@...ngson.cn>
On Fri, Mar 31, 2023 at 8:48 PM Donglin Peng <pengdonglin@...gfor.com.cn> wrote:
>
> The previous patch ("function_graph: Support recording and printing
> the return value of function") has laid the groundwork for the for
> the funcgraph-retval, and this modification makes it available on
> the LoongArch platform.
>
> We introduce a new structure called fgraph_ret_regs for the LoongArch
> platform to hold return registers and the frame pointer. We then fill
> its content in the return_to_handler and pass its address to the
> function ftrace_return_to_handler to record the return value.
>
> Signed-off-by: Donglin Peng <pengdonglin@...gfor.com.cn>
> ---
> v10:
> - Fix code style issues for LoongArch
> - Use CONFIG_FUNCTION_GRAPH_TRACER to control fgraph_ret_regs definition
>
> v9:
> - Fix stack pointer align issues
> - Update the commit message
>
> v8:
> - Modify the control range of CONFIG_HAVE_FUNCTION_GRAPH_RETVAL
> ---
> arch/loongarch/Kconfig | 1 +
> arch/loongarch/include/asm/ftrace.h | 22 ++++++++++++++++++++++
> arch/loongarch/kernel/asm-offsets.c | 15 ++++++++++++++-
> arch/loongarch/kernel/mcount.S | 14 ++++++++------
> arch/loongarch/kernel/mcount_dyn.S | 15 ++++++++-------
> 5 files changed, 53 insertions(+), 14 deletions(-)
>
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index 7fd51257e0ed..4bf60132869b 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -99,6 +99,7 @@ config LOONGARCH
> select HAVE_FAST_GUP
> select HAVE_FTRACE_MCOUNT_RECORD
> select HAVE_FUNCTION_ARG_ACCESS_API
> + select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
> select HAVE_FUNCTION_GRAPH_TRACER
> select HAVE_FUNCTION_TRACER
> select HAVE_GENERIC_VDSO
> diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h
> index 3418d32d4fc7..22797b7504b5 100644
> --- a/arch/loongarch/include/asm/ftrace.h
> +++ b/arch/loongarch/include/asm/ftrace.h
> @@ -63,4 +63,26 @@ void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
>
> #endif /* CONFIG_FUNCTION_TRACER */
>
> +#ifndef __ASSEMBLY__
> +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
> +struct fgraph_ret_regs {
> + /* a0 - a1 */
> + unsigned long regs[2];
> +
> + unsigned long fp;
> + unsigned long __unused;
> +};
> +
> +static inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs)
> +{
> + return ret_regs->regs[0];
> +}
> +
> +static inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs)
> +{
> + return ret_regs->fp;
> +}
> +#endif /* ifdef CONFIG_FUNCTION_GRAPH_TRACER */
> +#endif
> +
> #endif /* _ASM_LOONGARCH_FTRACE_H */
> diff --git a/arch/loongarch/kernel/asm-offsets.c b/arch/loongarch/kernel/asm-offsets.c
> index 4bdb203fc66e..505e4bf59603 100644
> --- a/arch/loongarch/kernel/asm-offsets.c
> +++ b/arch/loongarch/kernel/asm-offsets.c
> @@ -12,6 +12,7 @@
> #include <asm/cpu-info.h>
> #include <asm/ptrace.h>
> #include <asm/processor.h>
> +#include <asm/ftrace.h>
>
> void output_ptreg_defines(void)
> {
> @@ -264,7 +265,7 @@ void output_smpboot_defines(void)
> #ifdef CONFIG_HIBERNATION
> void output_pbe_defines(void)
> {
> - COMMENT(" Linux struct pbe offsets. ");
> + COMMENT("Linux struct pbe offsets.");
> OFFSET(PBE_ADDRESS, pbe, address);
> OFFSET(PBE_ORIG_ADDRESS, pbe, orig_address);
> OFFSET(PBE_NEXT, pbe, next);
> @@ -272,3 +273,15 @@ void output_pbe_defines(void)
> BLANK();
> }
> #endif
> +
> +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
> +void output_fgraph_ret_regs_defines(void)
> +{
> + COMMENT("LoongArch fgraph_ret_regs offsets.");
> + OFFSET(FGRET_REGS_A0, fgraph_ret_regs, regs[0]);
> + OFFSET(FGRET_REGS_A1, fgraph_ret_regs, regs[1]);
> + OFFSET(FGRET_REGS_FP, fgraph_ret_regs, fp);
> + DEFINE(FGRET_REGS_SIZE, sizeof(struct fgraph_ret_regs));
> + BLANK();
> +}
> +#endif
> diff --git a/arch/loongarch/kernel/mcount.S b/arch/loongarch/kernel/mcount.S
> index 8cdc1563cd33..cb8e5803de4b 100644
> --- a/arch/loongarch/kernel/mcount.S
> +++ b/arch/loongarch/kernel/mcount.S
> @@ -79,18 +79,20 @@ SYM_FUNC_START(ftrace_graph_caller)
> SYM_FUNC_END(ftrace_graph_caller)
>
> SYM_FUNC_START(return_to_handler)
> - PTR_ADDI sp, sp, -2 * SZREG
> - PTR_S a0, sp, 0
> - PTR_S a1, sp, SZREG
> + PTR_ADDI sp, sp, -FGRET_REGS_SIZE
> + PTR_S a0, sp, FGRET_REGS_A0
> + PTR_S a1, sp, FGRET_REGS_A1
> + PTR_S zero, sp, FGRET_REGS_FP
>
> + move a0, sp
> bl ftrace_return_to_handler
>
> /* Restore the real parent address: a0 -> ra */
> move ra, a0
>
> - PTR_L a0, sp, 0
> - PTR_L a1, sp, SZREG
> - PTR_ADDI sp, sp, 2 * SZREG
> + PTR_L a0, sp, FGRET_REGS_A0
> + PTR_L a1, sp, FGRET_REGS_A1
> + PTR_ADDI sp, sp, FGRET_REGS_SIZE
> jr ra
> SYM_FUNC_END(return_to_handler)
> #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
> diff --git a/arch/loongarch/kernel/mcount_dyn.S b/arch/loongarch/kernel/mcount_dyn.S
> index bbabf06244c2..ec24ae1de741 100644
> --- a/arch/loongarch/kernel/mcount_dyn.S
> +++ b/arch/loongarch/kernel/mcount_dyn.S
> @@ -131,18 +131,19 @@ SYM_CODE_END(ftrace_graph_caller)
>
> SYM_CODE_START(return_to_handler)
> /* Save return value regs */
> - PTR_ADDI sp, sp, -2 * SZREG
> - PTR_S a0, sp, 0
> - PTR_S a1, sp, SZREG
> + PTR_ADDI sp, sp, -FGRET_REGS_SIZE
> + PTR_S a0, sp, FGRET_REGS_A0
> + PTR_S a1, sp, FGRET_REGS_A1
> + PTR_S zero, sp, FGRET_REGS_FP
>
> - move a0, zero
> + move a0, sp
> bl ftrace_return_to_handler
> move ra, a0
>
> /* Restore return value regs */
> - PTR_L a0, sp, 0
> - PTR_L a1, sp, SZREG
> - PTR_ADDI sp, sp, 2 * SZREG
> + PTR_L a0, sp, FGRET_REGS_A0
> + PTR_L a1, sp, FGRET_REGS_A1
> + PTR_ADDI sp, sp, FGRET_REGS_SIZE
>
> jr ra
> SYM_CODE_END(return_to_handler)
> --
> 2.25.1
>
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