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:   Mon, 30 Sep 2019 16:34:37 +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(+)

How did you test this?

Will