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dma-mapping.h: add the dma_unmap state API 

Adds the following macros:

DECLARE_DMA_UNMAP_ADDR(ADDR_NAME)
DECLARE_DMA_UNMAP_LEN(LEN_NAME)
dma_unmap_addr(PTR, ADDR_NAME)
dma_unmap_addr_set(PTR, ADDR_NAME, VAL)
dma_unmap_len(PTR, LEN_NAME)
dma_unmap_len_set(PTR, LEN_NAME, VAL)

The API corresponds to the pci_unmap state API.  We'll move to this new
generic API from the PCI specific API in the long term.  As
include/asm-generic/pci-dma-compat.h does, the pci_unmap API simply calls
the new generic API for some time.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@suse.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2010-03-10 15:23:31 -08:00 committed by Linus Torvalds
parent f41b177157
commit 0acedc124a
3 changed files with 80 additions and 15 deletions
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58
Documentation/DMA-API.txt
View File

@ -472,6 +472,64 @@ void whizco_dma_map_sg_attrs(struct device *dev, dma_addr_t dma_addr,
....
Part Ie - Optimizing Unmap State Space Consumption
--------------------------------
On some platforms, dma_unmap_{single,page}() is simply a nop.
Therefore, keeping track of the mapping address and length is a waste
of space. Instead of filling your drivers up with ifdefs and the like
to "work around" this (which would defeat the whole purpose of a
portable API) the following facilities are provided.
Actually, instead of describing the macros one by one, we'll
transform some example code.
1) Use DEFINE_DMA_UNMAP_{ADDR,LEN} in state saving structures.
Example, before:
struct ring_state {
struct sk_buff *skb;
dma_addr_t mapping;
__u32 len;
};
after:
struct ring_state {
struct sk_buff *skb;
DEFINE_DMA_UNMAP_ADDR(mapping);
DEFINE_DMA_UNMAP_LEN(len);
};
2) Use dma_unmap_{addr,len}_set to set these values.
Example, before:
ringp->mapping = FOO;
ringp->len = BAR;
after:
dma_unmap_addr_set(ringp, mapping, FOO);
dma_unmap_len_set(ringp, len, BAR);
3) Use dma_unmap_{addr,len} to access these values.
Example, before:
dma_unmap_single(dev, ringp->mapping, ringp->len,
DMA_FROM_DEVICE);
after:
dma_unmap_single(dev,
dma_unmap_addr(ringp, mapping),
dma_unmap_len(ringp, len),
DMA_FROM_DEVICE);
It really should be self-explanatory. We treat the ADDR and LEN
separately, because it is possible for an implementation to only
need the address in order to perform the unmap operation.
Part II - Advanced dma_ usage
-----------------------------

16
include/linux/dma-mapping.h
View File

@ -232,4 +232,20 @@ struct dma_attrs;
#endif /* CONFIG_HAVE_DMA_ATTRS */
#ifdef CONFIG_NEED_DMA_MAP_STATE
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
#define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
#else
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
#define dma_unmap_addr(PTR, ADDR_NAME) (0)
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
#define dma_unmap_len(PTR, LEN_NAME) (0)
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
#endif
#endif

21
include/linux/pci-dma.h
View File

@ -1,20 +1,11 @@
#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
#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) DEFINE_DMA_UNMAP_ADDR(ADDR_NAME);
#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) DEFINE_DMA_UNMAP_LEN(LEN_NAME);
#define pci_unmap_addr dma_unmap_addr
#define pci_unmap_addr_set dma_unmap_addr_set
#define pci_unmap_len dma_unmap_len
#define pci_unmap_len_set dma_unmap_len_set
#endif