linux-kernel - Re: [PATCH 00/15] powerpc/watchpoint: Preparation for more than one watchpoint

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Message-Id: <429c04e9-7267-55a9-a6f9-1fe9b21ae033@linux.ibm.com>
Date:   Wed, 18 Mar 2020 18:22:28 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     mpe@...erman.id.au, mikey@...ling.org, apopple@...ux.ibm.com,
        paulus@...ba.org, npiggin@...il.com,
        naveen.n.rao@...ux.vnet.ibm.com, peterz@...radead.org,
        jolsa@...nel.org, oleg@...hat.com, fweisbec@...il.com,
        mingo@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH 00/15] powerpc/watchpoint: Preparation for more than one
 watchpoint



On 3/16/20 8:35 PM, Christophe Leroy wrote:
> 
> 
> Le 09/03/2020 à 09:57, Ravi Bangoria a écrit :
>> So far, powerpc Book3S code has been written with an assumption of only
>> one watchpoint. But future power architecture is introducing second
>> watchpoint register (DAWR). Even though this patchset does not enable
>> 2nd DAWR, it make the infrastructure ready so that enabling 2nd DAWR
>> should just be a matter of changing count.
> 
> Some book3s (e300 family for instance, I think G2 as well) already have a DABR2 in addition to DABR.
> Will this series allow to use it as well ?

I wasn't aware of that. I'll take a look at their specs and check if they
can piggyback on this series for 2nd DABR.

Thanks,
Ravi