linux-kernel - Re: [PATCH v3 00/27] Add support for OpenCAPI Persistent Memory devices

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Message-ID: <CAPcyv4j2hut1YDrotC=QkcM+S0SZwpd9_4hD2aChn+cKD+62oA@mail.gmail.com>
Date:   Fri, 21 Feb 2020 08:21:50 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Alastair D'Silva" <alastair@....ibm.com>
Cc:     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>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        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 00/27] Add support for OpenCAPI Persistent Memory devices

On Thu, Feb 20, 2020 at 7:28 PM Alastair D'Silva <alastair@....ibm.com> wrote:
>
> From: Alastair D'Silva <alastair@...ilva.org>
>
> This series adds support for OpenCAPI Persistent Memory devices, exposing
> them as nvdimms so that we can make use of the existing infrastructure.

A single sentence to introduce:

24 files changed, 3029 insertions(+), 97 deletions(-)

...is inadequate. What are OpenCAPI Persistent Memory devices? How do
they compare, in terms relevant to libnvdimm, to other persistent
memory devices? What challenges do they pose to the existing enabling?
What is the overall approach taken with this 27 patch break down? What
are the changes since v2, v1? If you incorporated someone's review
feedback note it in the cover letter changelog, if you didn't
incorporate someone's feedback note that too with an explanation.

In short, provide a bridge document for someone familiar with the
upstream infrastructure, but not necessarily steeped in powernv /
OpenCAPI platform details, to get started with this code.

For now, no need to resend the whole series, just reply to this
message with a fleshed out cover letter and then incorporate it going
forward for v4+.