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Subject: Re: [PATCH v3 21/27] powerpc/powernv/pmem: Add an IOCTL to request
 controller health & perf data
To:     Andrew Donnellan <ajd@linux.ibm.com>,
        "Alastair D'Silva" <alastair@au1.ibm.com>, alastair@d-silva.org
Cc:     "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
        "Oliver O'Halloran" <oohall@gmail.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Ira Weiny <ira.weiny@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Rob Herring <robh@kernel.org>,
        Anton Blanchard <anton@ozlabs.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
        =?UTF-8?Q?C=c3=a9dric_Le_Goater?= <clg@kaod.org>,
        Anju T Sudhakar <anju@linux.vnet.ibm.com>,
        Hari Bathini <hbathini@linux.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kurz <groug@kaod.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Alexey Kardashevskiy <aik@ozlabs.ru>,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-nvdimm@lists.01.org, linux-mm@kvack.org
References: <20200221032720.33893-1-alastair@au1.ibm.com>
 <20200221032720.33893-22-alastair@au1.ibm.com>
 <fdc5faec-d03d-3cba-4a9c-add7e522ad13@linux.ibm.com>
From:   Frederic Barrat <fbarrat@linux.ibm.com>
Date:   Wed, 4 Mar 2020 12:06:32 +0100
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Le 28/02/2020 à 07:12, Andrew Donnellan a écrit :
> On 21/2/20 2:27 pm, Alastair D'Silva wrote:
>> From: Alastair D'Silva <alastair@d-silva.org>
>>
>> When health & performance data is requested from the controller,
>> it responds with an error log containing the requested information.
>>
>> This patch allows the request to me issued via an IOCTL.
> 
> A better explanation would be good - this IOCTL triggers a request to 
> the controller to collect controller health/perf data, and the 
> controller will later respond with an error log that can be picked up 
> via the error log IOCTL that you've defined earlier.

And even more precisely (to also check my understanding):

 > this IOCTL triggers a request to
 > the controller to collect controller health/perf data, and the
 > controller will later respond

by raising an interrupt to let the user app know that

 > an error log that can be picked up
 > via the error log IOCTL that you've defined earlier.


The rest of the patch looks ok to me.

   Fred