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

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Date:   Wed, 04 Mar 2020 15:42:53 +1100
From:   "Alastair D'Silva" <alastair@....ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Frederic Barrat <fbarrat@...ux.ibm.com>
Cc:     "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, 2020-03-02 at 10:42 -0800, Dan Williams wrote:
> 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.


It will be in the patch that implements overwrite. I moved that patch
out of this series, as it needs more testing, so I guess I can submit
this alongside it.

-- 
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819