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From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: Frederic Barrat <fbarrat@linux.ibm.com>
Cc: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Paul Mackerras" <paulus@samba.org>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Andrew Donnellan" <ajd@linux.ibm.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Anton Blanchard" <anton@ozlabs.org>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Vasant Hegde" <hegdevasant@linux.vnet.ibm.com>,
	"David Gibson" <david@gibson.dropbear.id.au>,
	"Hari Bathini" <hbathini@linux.ibm.com>,
	"Allison Randal" <allison@lohutok.net>,
	"Anju T Sudhakar" <anju@linux.vnet.ibm.com>,
	"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
	"Cédric Le Goater" <clg@kaod.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Greg Kurz" <groug@kaod.org>,
	"Nicholas Piggin" <npiggin@gmail.com>,
	"Masahiro Yamada" <yamada.masahiro@socionext.com>,
	"Alexey Kardashevskiy" <aik@ozlabs.ru>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"David Hildenbrand" <david@redhat.com>,
	"Oscar Salvador" <osalvador@suse.com>,
	"Michal Hocko" <mhocko@suse.com>
Subject: Re: [PATCH 10/10] ocxl: Conditionally bind SCM devices to the generic OCXL driver
Date: Fri, 08 Nov 2019 11:37:14 +1100
Message-ID: <46d72d7b2f91900c4499db127e365baade38e18c.camel@au1.ibm.com> (raw)
In-Reply-To: <b70644d6-2c71-cd71-5d00-e25d99beea91@linux.ibm.com>

On Thu, 2019-11-07 at 19:08 +0100, Frederic Barrat wrote:
> 
> Le 25/10/2019 à 06:47, Alastair D'Silva a écrit :
> > From: Alastair D'Silva <alastair@d-silva.org>
> > 
> > This patch allows the user to bind OpenCAPI SCM devices to the
> > generic OCXL
> > driver.
> > 
> > Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> > ---
> 
> I'm wondering if we should upstream this. Is it of any use outside
> of 
> some serious debug session for a developer?
> Also we would now have 2 drivers picking up the same device ID,
> since 
> the SCM driver is always registering for that ID, irrespective of 
> CONFIG_OCXL_SCM_GENERIC
> 
>    Fred
> 

I think I'll drop this patch. It's easy enough to maintain out-of-tree
for our in-house SCM hardware engineers.

> 
> >   drivers/misc/ocxl/Kconfig | 7 +++++++
> >   drivers/misc/ocxl/pci.c   | 3 +++
> >   2 files changed, 10 insertions(+)
> > 
> > diff --git a/drivers/misc/ocxl/Kconfig b/drivers/misc/ocxl/Kconfig
> > index 1916fa65f2f2..8a683715c97c 100644
> > --- a/drivers/misc/ocxl/Kconfig
> > +++ b/drivers/misc/ocxl/Kconfig
> > @@ -29,3 +29,10 @@ config OCXL
> >   	  dedicated OpenCAPI link, and don't follow the same protocol.
> >   
> >   	  If unsure, say N.
> > +
> > +config OCXL_SCM_GENERIC
> > +	bool "Treat OpenCAPI Storage Class Memory as a generic OpenCAPI
> > device"
> > +	default n
> > +	help
> > +	  Select this option to treat OpenCAPI Storage Class Memory
> > +	  devices an generic OpenCAPI devices.
> > diff --git a/drivers/misc/ocxl/pci.c b/drivers/misc/ocxl/pci.c
> > index cb920aa88d3a..7137055c1883 100644
> > --- a/drivers/misc/ocxl/pci.c
> > +++ b/drivers/misc/ocxl/pci.c
> > @@ -10,6 +10,9 @@
> >    */
> >   static const struct pci_device_id ocxl_pci_tbl[] = {
> >   	{ PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x062B), },
> > +#ifdef CONFIG_OCXL_SCM_GENERIC
> > +	{ PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0625), },
> > +#endif
> >   	{ }
> >   };
> >   MODULE_DEVICE_TABLE(pci, ocxl_pci_tbl);
> > 
-- 
Alastair D'Silva
Open Source Developer
Linux Technology Centre, IBM Australia
mob: 0423 762 819
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  reply index

Thread overview: 43+ 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
2019-10-25  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 [this message]
2019-10-25  7:57 ` [PATCH 00/10] Add support for OpenCAPI SCM devices Geert Uytterhoeven

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