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From: Dan Williams <dan.j.williams@intel.com>
To: Andrew Donnellan <ajd@linux.ibm.com>
Cc: "Oscar Salvador" <osalvador@suse.com>,
	"Michal Hocko" <mhocko@suse.com>,
	"David Hildenbrand" <david@redhat.com>,
	"Alexey Kardashevskiy" <aik@ozlabs.ru>,
	"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
	"Wei Yang" <richard.weiyang@gmail.com>,
	"Keith Busch" <keith.busch@intel.com>,
	"Masahiro Yamada" <yamada.masahiro@socionext.com>,
	"Paul Mackerras" <paulus@samba.org>,
	"Ira Weiny" <ira.weiny@intel.com>,
	"Dave Jiang" <dave.jiang@intel.com>,
	linux-nvdimm <linux-nvdimm@lists.01.org>,
	"Vishal Verma" <vishal.l.verma@intel.com>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Pavel Tatashin" <pasha.tatashin@soleen.com>,
	"Arnd Bergmann" <arnd@arndb.de>, "Greg Kurz" <groug@kaod.org>,
	"Nicholas Piggin" <npiggin@gmail.com>, "Qian Cai" <cai@lca.pw>,
	"Cédric Le Goater" <clg@kaod.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Hari Bathini" <hbathini@linux.ibm.com>,
	"David Gibson" <david@gibson.dropbear.id.au>,
	"Alastair D\'Silva" <alastair@au1.ibm.com>,
	"Linux MM" <linux-mm@kvack.org>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Frederic Barrat" <fbarrat@linux.ibm.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH 08/10] nvdimm: Add driver for OpenCAPI Storage Class Memory
Date: Mon, 18 Nov 2019 20:41:37 -0800
Message-ID: <CAPcyv4gOB3=U_0NU81qr1v8w4rd8i3AMHZuT1hs05sx287YgcA@mail.gmail.com> (raw)
In-Reply-To: <33b6f6b2-5ca1-7c08-01db-6aad73f9a0ec@linux.ibm.com>

On Mon, Nov 18, 2019 at 7:29 PM Andrew Donnellan <ajd@linux.ibm.com> wrote:
>
> On 19/11/19 1:48 pm, Alastair D'Silva wrote:
> > On Tue, 2019-11-19 at 10:47 +1100, Andrew Donnellan wrote:
> >> On 15/11/19 3:35 am, Dan Williams wrote:
> >>>> Have you discussed with the directory owner if it's ok to split
> >>>> the
> >>>> driver over several files?
> >>>
> >>> My thought is to establish drivers/opencapi/ and move this and the
> >>> existing drivers/misc/ocxl/ bits there.
> >>
> >> Is there any other justification for this we can think of apart from
> >> not
> >> wanting to put this driver in the nvdimm directory? OpenCAPI drivers
> >> aren't really a category of driver unto themselves.
> >>
> >
> > There is a precedent for bus-based dirs, eg. drivers/(ide|w1|spi) all
> > contain drivers for both controllers & connected devices.
> >
> > Fred, how do you feel about moving the generic OpenCAPI driver out of
> > drivers/misc?
>
> Instinctively I don't like the idea of creating a whole opencapi
> directory, as OpenCAPI is a generic bus which is not tightly coupled to
> any particular application area, and drivers for other OpenCAPI devices
> are already spread throughout the tree (e.g. cxlflash in drivers/scsi).

I'm not suggesting all opencapi drivers go there, nor the entirety of
this driver, just common infrastructure. That said, it's hard to talk
about specifics given the current state of the patch set. I have not
even taken a deeper look past the changelog as this 3K lines-of-code
submission needs to be broken up into smaller pieces before we settle
on what pieces belong where.

Just looking at the diffstat, at a minimum it's not appropriate for
them to live in drivers/nvdimm/ directly, drivers/nvdimm/oxcl/ would
be an acceptable starting point.

  reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-25  4:46 [PATCH 00/10] Add support for OpenCAPI SCM devices Alastair D'Silva
2019-10-25  4:46 ` [PATCH 01/10] memory_hotplug: Add a bounds check to __add_pages Alastair D'Silva
2019-10-25  4:46 ` [PATCH 02/10] nvdimm: remove prototypes for nonexistent functions Alastair D'Silva
2019-10-27 23:41   ` Andrew Donnellan
2019-11-07 17:56   ` Frederic Barrat
2019-11-15  4:30   ` Dan Williams
2019-10-25  4:46 ` [PATCH 03/10] powerpc: Add OPAL calls for LPC memory alloc/release Alastair D'Silva
2019-11-07 17:57   ` Frederic Barrat
2019-10-25  4:46 ` [PATCH 04/10] powerpc: Map & release OpenCAPI LPC memory Alastair D'Silva
2019-10-27 21:24   ` kbuild test robot
2019-10-27 21:59   ` kbuild test robot
2019-10-28  2:34   ` kbuild test robot
2019-10-29  1:49   ` Andrew Donnellan
2019-10-29  2:44     ` Alastair D'Silva
2019-10-29  2:47       ` Andrew Donnellan
2019-11-07 17:59   ` Frederic Barrat
2019-11-11  9:34   ` Aneesh Kumar K.V
2019-10-25  4:47 ` [PATCH 05/10] ocxl: Tally up the LPC memory on a link & allow it to be mapped Alastair D'Silva
2019-11-07 18:02   ` Frederic Barrat
2019-10-25  4:47 ` [PATCH 06/10] ocxl: Add functions to map/unmap LPC memory Alastair D'Silva
2019-11-07 18:05   ` Frederic Barrat
2019-10-25  4:47 ` [PATCH 07/10] ocxl: Save the device serial number in ocxl_fn Alastair D'Silva
2019-11-06  3:10   ` Andrew Donnellan
2019-11-07 18:18   ` Frederic Barrat
2019-10-25  4:47 ` [PATCH 08/10] nvdimm: Add driver for OpenCAPI Storage Class Memory Alastair D'Silva
2019-10-27 22:19   ` kbuild test robot
2019-10-27 22:53   ` kbuild test robot
2019-10-28  1:12   ` [RFC PATCH] nvdimm: scm_get() can be static kbuild test robot
2019-11-11 11:14   ` [PATCH 08/10] nvdimm: Add driver for OpenCAPI Storage Class Memory Aneesh Kumar K.V
2019-11-12  5:37     ` Dan Williams
2019-11-12  5:41       ` Dan Williams
2019-11-14 13:41   ` Frederic Barrat
2019-11-14 16:35     ` Dan Williams
2019-11-18 23:47       ` Andrew Donnellan
2019-11-19  0:04         ` Dan Williams
2019-11-19  2:48         ` Alastair D'Silva
2019-11-19  3:26           ` Andrew Donnellan
2019-11-19  4:41             ` Dan Williams [this message]
2019-11-18 23:01     ` Alastair D'Silva
2019-10-25  4:47 ` [PATCH 09/10] powerpc: Enable OpenCAPI Storage Class Memory driver on bare metal Alastair D'Silva
2019-10-28  2:43   ` Oliver O'Halloran
2019-11-08  7:10   ` Frederic Barrat
2019-11-11  9:46   ` Aneesh Kumar K.V
2019-10-25  4:47 ` [PATCH 10/10] ocxl: Conditionally bind SCM devices to the generic OCXL driver Alastair D'Silva
2019-10-26  6:43   ` Christoph Hellwig
2019-11-06  3:46   ` Andrew Donnellan
2019-11-07 18:08   ` Frederic Barrat
2019-11-08  0:37     ` Alastair D'Silva
2019-10-25  7:57 ` [PATCH 00/10] Add support for OpenCAPI SCM devices Geert Uytterhoeven

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