linux-kernel - Re: [PATCH v3 15/27] powerpc/powernv/pmem: Add support for near storage commands

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Message-ID: <CAPcyv4gCCjQFnLaSpRPEuKoDq3gOHSxjxLT_=X3N_nr=2ZOcSA@mail.gmail.com>
Date:   Mon, 2 Mar 2020 10:42:06 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Frederic Barrat <fbarrat@...ux.ibm.com>
Cc:     "Alastair D'Silva" <alastair@....ibm.com>, alastair@...ilva.org,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kurz <groug@...d.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v3 15/27] powerpc/powernv/pmem: Add support for near
 storage commands

On Mon, Mar 2, 2020 at 9:59 AM Frederic Barrat <fbarrat@...ux.ibm.com> wrote:
>
>
>
> Le 21/02/2020 à 04:27, Alastair D'Silva a écrit :
> > From: Alastair D'Silva <alastair@...ilva.org>
> >
> > Similar to the previous patch, this adds support for near storage commands.
> >
> > Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> > ---
>
>
> Is any of these new functions ever called?

This is my concern as well. The libnvdimm command support is limited
to the commands that Linux will use. Other passthrough commands are
supported through a passthrough interface. However, that passthrough
interface is explicitly limited to publicly documented command sets so
that the kernel has an opportunity to constrain and consolidate
command implementations across vendors.