linux-kernel - Re: [PATCH] irqchip/gic-v3: do not access GICR

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Message-ID: <CAPKp9uaJK8AQPgqYCmVmpS0RsMBPGUAK_xXkHsNDg+2e3MygyQ@mail.gmail.com>
Date:   Tue, 12 Jun 2018 16:24:22 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        "Nayak, Rajendra" <rnayak@...eaurora.org>,
        bjorn.andersson@...aro.org, sboyd@...nel.org,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH] irqchip/gic-v3: do not access GICR_WAKER if its secured register.

On Tue, Jun 12, 2018 at 3:55 PM, Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
> GICR_WAKER can be a secured register, check this before accessing it
> as its done in power management code.
>
> Without this patch Qualcomm DB820c board crashes.
>

Are you sure this is the one causing the crash ?

As per GIC specification:
"When GICD_CTLR.DS==1, this register is always accessible.
 When GICD_CTLR.DS==0, this is a Secure register. This register is RAZ/WI
 to Non-secure accesses."


--
Regards,
Sudeep