lkml.org 
[lkml]   [2007]   [Oct]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH -mm 01/11] add device_dma_parameters structure
    FUJITA Tomonori wrote:
    > iommu code merges scatter/gather segments without considering a low
    > level driver's restrictions. The problem is that iommu code can't
    > access to the limitations because they are in request_queue.
    >
    > This patch adds a new structure, device_dma_parameters, including dma
    > information. A pointer to device_dma_parameters is added to struct
    > device.
    >
    > - there are only max_segment_size and segment_boundary_mask there but
    > we'll move more dma stuff in struct device (like dma_mask) to struct
    > device_dma_parameters later. segment_boundary_mask is not supported
    > yet.
    >
    > - new accessors for the dma parameters are added. So we can easily
    > change where to place struct device_dma_parameters in the future.
    >
    > - dma_get_max_seg_size returns 64K if dma_parms in struct device isn't
    > set up properly. 64K is the default max_segment_size in the block
    > layer.
    >
    > Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    > ---
    > include/linux/device.h | 11 +++++++++++
    > include/linux/dma-mapping.h | 15 +++++++++++++++
    > 2 files changed, 26 insertions(+), 0 deletions(-)

    ACK


    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-10-24 13:35    [W:0.034 / U:57.988 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site