Re: [PATCH 10/10] ocxl: Conditionally bind SCM devices to the generic OCXL driver

[Alastair D'Silva]

On Thu, 2019-11-07 at 19:08 +0100, Frederic Barrat wrote:
> 
> Le 25/10/2019 Ã 06:47, Alastair D'Silva a Ãcrit :
> > From: Alastair D'Silva <alastair@xxxxxxxxxxx>
> > 
> > This patch allows the user to bind OpenCAPI SCM devices to the
> > generic OCXL
> > driver.
> > 
> > Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
> > ---
> 
> 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