• Arthur Kepner's avatar
    dma: add dma_*map*_attrs() interfaces · 74bc7cee
    Arthur Kepner authored
    Introduce new interfaces, dma_*map*_attrs(), for passing architecture-specific
    attributes when memory is mapped and unmapped for DMA.  Give the interfaces
    default implementations which ignore attributes.  Also introduce the
    dma_{set|get}_attr() interfaces for setting and retrieving individual
    attributes.  Define one attribute, DMA_ATTR_WRITE_BARRIER, in anticipation of
    its use by ia64/sn.  Select whether architectures implement arch-specific
    versions of the dma_*map*_attrs() interfaces via HAVE_DMA_ATTRS in Kconfig.
    [markn@au1.ibm.com: dma_{set,get}_attr() have to be static inline]
    Signed-off-by: default avatarArthur Kepner <akepner@sgi.com>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
    Cc: Jes Sorensen <jes@sgi.com>
    Cc: Randy Dunlap <randy.dunlap@oracle.com>
    Cc: Roland Dreier <rdreier@cisco.com>
    Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
    Cc: David Miller <davem@davemloft.net>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Grant Grundler <grundler@parisc-linux.org>
    Cc: Michael Ellerman <michael@ellerman.id.au>
    Signed-off-by: default avatarMark Nelson <markn@au1.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
dma-mapping.h 4.41 KB