linux-kernel - Re: [RESEND PATCH] ARM/hw_breakpoint: add ARMv8.1/ARMv8.2 debug architecutre versions support in enable_monitor

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Date:   Tue, 22 Oct 2019 13:25:50 +0100
From:   Will Deacon <will@...nel.org>
To:     Candle Sun <candlesea@...il.com>
Cc:     mark.rutland@....com, linux@...linux.org.uk,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Candle Sun <candle.sun@...soc.com>,
        Nianfu Bai <nianfu.bai@...soc.com>
Subject: Re: [RESEND PATCH] ARM/hw_breakpoint: add ARMv8.1/ARMv8.2 debug
 architecutre versions support in enable_monitor_mode()

On Thu, Sep 26, 2019 at 03:38:28PM +0800, Candle Sun wrote:
> From: Candle Sun <candle.sun@...soc.com>
> 
> When ARMv8.1/ARMv8.2 cores are used in AArch32 mode,
> arch_hw_breakpoint_init() in arch/arm/kernel/hw_breakpoint.c will be used.
> 
> From ARMv8 specification, different debug architecture versions defined:
> * 0110 ARMv8, v8 Debug architecture.
> * 0111 ARMv8.1, v8 Debug architecture, with Virtualization Host Extensions.
> * 1000 ARMv8.2, v8.2 Debug architecture.
> 
> So missing ARMv8.1/ARMv8.2 cases will cause enable_monitor_mode() function
> returns -ENODEV, and arch_hw_breakpoint_init() will fail.
> 
> Signed-off-by: Candle Sun <candle.sun@...soc.com>
> Signed-off-by: Nianfu Bai <nianfu.bai@...soc.com>
> ---
>  arch/arm/include/asm/hw_breakpoint.h | 2 ++
>  arch/arm/kernel/hw_breakpoint.c      | 2 ++
>  2 files changed, 4 insertions(+)

[...]

> diff --git a/arch/arm/include/asm/hw_breakpoint.h b/arch/arm/include/asm/hw_breakpoint.h
> index ac54c06..9137ef6 100644
> --- a/arch/arm/include/asm/hw_breakpoint.h
> +++ b/arch/arm/include/asm/hw_breakpoint.h
> @@ -53,6 +53,8 @@ static inline void decode_ctrl_reg(u32 reg,
>  #define ARM_DEBUG_ARCH_V7_MM	4
>  #define ARM_DEBUG_ARCH_V7_1	5
>  #define ARM_DEBUG_ARCH_V8	6
> +#define ARM_DEBUG_ARCH_V8_1	7
> +#define ARM_DEBUG_ARCH_V8_2	8

Looks like you can also add:

#define ARM_DEBUG_ARCH_V8_4	9

and treat that the same way. With that, and a fix to $SUBJECT:

Acked-by: Will Deacon <will@...nel.org>

Please put this into the patch system [1].

Will

[1] https://www.arm.linux.org.uk/developer/patches/