linux-kernel - [PATCH v2 -mm 00/14] adds include/linux/pci-dma.h

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Date:	Wed, 10 Feb 2010 10:34:33 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, fujita.tomonori@....ntt.co.jp,
	x86@...nel.org, Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Russell King <linux@....linux.org.uk>,
	David Howells <dhowells@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kyle McMartin <kyle@...artin.ca>, Helge Deller <deller@....de>,
	James Bottomley <James.Bottomley@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Zankel <chris@...kel.net>, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v2 -mm 00/14] adds include/linux/pci-dma.h

This patch adds include/linux/pci-dma.h that defines the pci_unmap
state API to remove the duplication in architecture implementations:

DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
DECLARE_PCI_UNMAP_LEN(LEN_NAME)
pci_unmap_addr(PTR, ADDR_NAME)
pci_unmap_addr_set(PTR, ADDR_NAME, VAL)
pci_unmap_len(PTR, LEN_NAME)
pci_unmap_len_set(PTR, LEN_NAME, VAL)

This enables us to remove lots of the duplication in architecture
implementations since there are only two ways to define the API.

If architectures define CONFIG_NEED_DMA_MAP_STATE, they get the real
definition of pci_unmap state API. If not, they get the noop
definition.

In the long term, it's better to replace the API with the generic
device model API such as DECLARE_DMA_UNMAP_ADDR. We can map the API to
the generic one (like dma-mapping-compat.h does). This patch also
makes the migration process easier. We can remove this file after the
migration.

It might be simpler to add the API to include/linux/pci.h but looks
it's already too large. We'll remove pci-dma.h after finishing moving
to the generic device model. So I put the API to a separate file.

This is the second version of:

http://marc.info/?l=linux-kernel&m=126572502029999&w=2

=
 arch/alpha/Kconfig              |    3 +++
 arch/alpha/include/asm/pci.h    |   14 --------------
 arch/arm/Kconfig                |    3 +++
 arch/arm/include/asm/pci.h      |   11 -----------
 arch/cris/include/asm/pci.h     |    8 --------
 arch/frv/include/asm/pci.h      |    8 --------
 arch/ia64/Kconfig               |    3 +++
 arch/ia64/include/asm/pci.h     |   14 --------------
 arch/mips/Kconfig               |    4 ++--
 arch/mips/include/asm/pci.h     |   22 ----------------------
 arch/parisc/Kconfig             |    3 +++
 arch/parisc/include/asm/pci.h   |   14 --------------
 arch/powerpc/Kconfig            |    3 +++
 arch/powerpc/include/asm/pci.h  |   32 --------------------------------
 arch/sh/Kconfig                 |    3 +++
 arch/sh/include/asm/pci.h       |   19 -------------------
 arch/sparc/Kconfig              |    3 +++
 arch/sparc/include/asm/pci_32.h |   14 --------------
 arch/sparc/include/asm/pci_64.h |   14 --------------
 arch/x86/Kconfig                |    3 +++
 arch/x86/include/asm/pci.h      |   28 ----------------------------
 arch/xtensa/include/asm/pci.h   |    8 --------
 include/linux/pci-dma.h         |   20 ++++++++++++++++++++
 include/linux/pci.h             |    1 +
 24 files changed, 47 insertions(+), 208 deletions(-)



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