linux-kernel - [PATCH v2 -mm 01/14] adds include/linux/pci-dma.h

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Date:	Wed, 10 Feb 2010 10:34:34 +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 01/14] adds include/linux/pci-dma.h

This patch adds include/linux/pci-dma.h that defines the pci_unmap
state API:

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.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc: x86@...nel.org
Cc: Richard Henderson <rth@...ddle.net>
Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
Cc: Matt Turner <mattst88@...il.com>
Cc: Russell King <linux@....linux.org.uk>
Cc: David Howells <dhowells@...hat.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: Kyle McMartin <kyle@...artin.ca>
Cc: Helge Deller <deller@....de>
Cc: James Bottomley <James.Bottomley@...e.de>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: David S. Miller <davem@...emloft.net>
Cc: Chris Zankel <chris@...kel.net>
Cc: Arnd Bergmann <arnd@...db.de>
---
 include/linux/pci-dma.h |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)
 create mode 100644 include/linux/pci-dma.h

diff --git a/include/linux/pci-dma.h b/include/linux/pci-dma.h
new file mode 100644
index 0000000..cfd63ab
--- /dev/null
+++ b/include/linux/pci-dma.h
@@ -0,0 +1,20 @@
+#ifndef _LINUX_PCI_DMA_H
+#define _LINUX_PCI_DMA_H
+
+#ifdef CONFIG_NEED_DMA_MAP_STATE
+#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)        dma_addr_t ADDR_NAME;
+#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)          __u32 LEN_NAME;
+#define pci_unmap_addr(PTR, ADDR_NAME)           ((PTR)->ADDR_NAME)
+#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)  (((PTR)->ADDR_NAME) = (VAL))
+#define pci_unmap_len(PTR, LEN_NAME)             ((PTR)->LEN_NAME)
+#define pci_unmap_len_set(PTR, LEN_NAME, VAL)    (((PTR)->LEN_NAME) = (VAL))
+#else
+#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
+#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
+#define pci_unmap_addr(PTR, ADDR_NAME)           (0)
+#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)  do { } while (0)
+#define pci_unmap_len(PTR, LEN_NAME)             (0)
+#define pci_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
+#endif
+
+#endif
-- 
1.5.6.5

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