linux-kernel - Re: [PATCH v2 07/17] cxl: Add new header for call backs and structs

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Message-ID: <1412221071.19209.103.camel@ale.ozlabs.ibm.com>
Date:	Thu, 02 Oct 2014 13:37:51 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	greg@...ah.com, arnd@...db.de, benh@...nel.crashing.org,
	anton@...ba.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, jk@...abs.org, imunsie@...ibm.com,
	cbe-oss-dev@...ts.ozlabs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 07/17] cxl: Add new header for call backs and structs

On Wed, 2014-10-01 at 22:00 +1000, Michael Ellerman wrote:
> On Tue, 2014-30-09 at 10:34:56 UTC, Michael Neuling wrote:
> > From: Ian Munsie <imunsie@....ibm.com>
> > 
> > This new header add defines for callbacks and structs needed by the rest of the
>                   adds
> > kernel to hook into the cxl infrastructure.
> > 
> > Empty functions are provided when CONFIG CXL_BASE is not enabled.
> > 
> > Signed-off-by: Ian Munsie <imunsie@....ibm.com>
> > Signed-off-by: Michael Neuling <mikey@...ling.org>
> > ---
> >  include/misc/cxl.h | 34 ++++++++++++++++++++++++++++++++++
> 
> include/misc is kind of weird. I guess it's a misc device.
> 
> Any reason not to have it in arch/powerpc/include ?

We can do either way.  We did consider it a driver so putting it in
arch/powerpc didn't seem quite right.

I might leave it here unless you really object.

> 
> > diff --git a/include/misc/cxl.h b/include/misc/cxl.h
> > new file mode 100644
> > index 0000000..bde46a3
> > --- /dev/null
> > +++ b/include/misc/cxl.h
> > @@ -0,0 +1,34 @@
> > +/*
> > + * Copyright 2014 IBM Corp.
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * as published by the Free Software Foundation; either version
> > + * 2 of the License, or (at your option) any later version.
> > + */
> > +
> > +#ifndef _MISC_ASM_CXL_H
> 
> No ASM.

Oops, yes.

> 
> > +#define _MISC_ASM_CXL_H
> > +
> > +#define CXL_IRQ_RANGES 4
> > +
> > +struct cxl_irq_ranges {
> > +	irq_hw_number_t offset[CXL_IRQ_RANGES];
> > +	irq_hw_number_t range[CXL_IRQ_RANGES];
> > +};
> > +
> > +#ifdef CONFIG_CXL_BASE
> > +
> > +void cxl_slbia(struct mm_struct *mm);
> > +void cxl_ctx_get(void);
> > +void cxl_ctx_put(void);
> > +bool cxl_ctx_in_use(void);
> > +
> > +#else /* CONFIG_CXL_BASE */
> > +
> > +#define cxl_slbia(...) do { } while (0)
> > +#define cxl_ctx_in_use(...) false
> 
> Any reason these shouldn't be static inlines?

No, I'll change.

Mikey
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