linux-kernel - Re: [RFC] asm-generic/pci_iomap.h: make custom PCI BAR requirements explicit

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Date:	Sat, 3 Oct 2015 01:17:06 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, arnd@...db.de,
	linux-arch@...r.kernel.org, mingo@...nel.org,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	linux-s390@...r.kernel.org, bp@...e.de, linux@...ck-us.net,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	rostedt@...dmis.org
Subject: Re: [RFC] asm-generic/pci_iomap.h: make custom PCI BAR requirements
 explicit

On Fri, Aug 28, 2015 at 07:13:08PM -0700, Randy Dunlap wrote:
> On 08/28/15 17:17, Luis R. Rodriguez wrote:
> > 
> >  arch/s390/Kconfig                 |  8 +++++
> >  arch/s390/include/asm/io.h        | 11 -------
> >  arch/s390/include/asm/pci.h       |  2 --
> >  arch/s390/include/asm/pci_iomap.h | 33 +++++++++++++++++++++
> >  arch/s390/pci/pci.c               |  2 ++
> >  include/asm-generic/io.h          | 12 --------
> >  include/asm-generic/iomap.h       | 10 -------
> >  include/asm-generic/pci_iomap.h   | 62 +++++++++++++++++++++++++++++++++++----
> >  lib/Kconfig                       |  1 +
> >  lib/pci_iomap.c                   |  5 ++++
> >  10 files changed, 105 insertions(+), 41 deletions(-)
> >  create mode 100644 arch/s390/include/asm/pci_iomap.h
> > 
> > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> > index 1d57000b1b24..1217b7db4265 100644
> > --- a/arch/s390/Kconfig
> > +++ b/arch/s390/Kconfig
> > @@ -614,6 +614,14 @@ endif	# PCI
> >  config PCI_DOMAINS
> >  	def_bool PCI
> >  
> > +config ARCH_PCI_NON_DISJUNCTIVE
> > +	def_bool PCI
> > +	help
> > +	  On the S390 architecture PCI BAR spaces are not disjunctive, as such
> 
> 	are not disjoint?  may be overlapping?
> 
> > +	  the PCI bar is required on a series of otherwise asm generic PCI
> > +	  routines, as such S390 requires itw own implemention for these
> 
> 	                                  its own implementation

Thanks, I've re-written this as:

mcgrof@...on ~/linux-next (git::(no branch, rebasing 20150805-pend-all))$ git diff
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index f4725d1af438..8ba5826ed13b 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -618,10 +618,10 @@ config PCI_DOMAINS
 config ARCH_PCI_NON_DISJUNCTIVE
        def_bool PCI
        help
-         On the S390 architecture PCI BAR spaces are not disjunctive, as such
-         the PCI bar is required on a series of otherwise asm generic PCI
-         routines, as such S390 requires itw own implemention for these
-         routines.
+         On the S390 architecture PCI BAR spaces may overlap with each other,
+         because of this the PCI bar is required on a series of otherwise asm
+         generic PCI routines and this in turn requires S390 to provide its
+         own implementation for these routines.
 
 config HAS_IOMEM
        def_bool PCI
> 

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