linux-kernel - Re: [PATCH v4 00/25] Add support for OpenCAPI Persistent Memory devices

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Message-ID: <20200402131012.579c7bf7@bahia.lan>
Date:   Thu, 2 Apr 2020 13:10:12 +0200
From:   Greg Kurz <groug@...d.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Oliver O'Halloran <oohall@...il.com>,
        Alastair D'Silva <alastair@...ilva.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        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>,
        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 v4 00/25] Add support for OpenCAPI Persistent Memory
 devices

On Thu, 02 Apr 2020 21:06:01 +1100
Michael Ellerman <mpe@...erman.id.au> wrote:

> "Oliver O'Halloran" <oohall@...il.com> writes:
> > On Thu, Apr 2, 2020 at 2:42 PM Michael Ellerman <mpe@...erman.id.au> wrote:
> >> "Alastair D'Silva" <alastair@...ilva.org> writes:
> >> >> -----Original Message-----
> >> >> From: Dan Williams <dan.j.williams@...el.com>
> >> >>
> >> >> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@...ilva.org>
> >> >> wrote:
> >> >> >
> >> >> > *snip*
> >> >> Are OPAL calls similar to ACPI DSMs? I.e. methods for the OS to invoke
> >> >> platform firmware services? What's Skiboot?
> >> >
> >> > Yes, OPAL is the interface to firmware for POWER. Skiboot is the open-source (and only) implementation of OPAL.
> >>
> >>   https://github.com/open-power/skiboot
> >>
> >> In particular the tokens for calls are defined here:
> >>
> >>   https://github.com/open-power/skiboot/blob/master/include/opal-api.h#L220
> >>
> >> And you can grep for the token to find the implementation:
> >>
> >>   https://github.com/open-power/skiboot/blob/master/hw/npu2-opencapi.c#L2328
> >
> > I'm not sure I'd encourage anyone to read npu2-opencapi.c. I find it
> > hard enough to follow even with access to the workbooks.
> 
> Compared to certain firmwares that run on certain other platforms it's
> actually pretty readable code ;)
> 

Forth rocks ! ;-)

> > There's an OPAL call API reference here:
> > http://open-power.github.io/skiboot/doc/opal-api/index.html
> 
> Even better.
> 
> cheers