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    Subject[PATCH v7 0/8] Raid: enable talitos xor offload for improving performance
    Hi all,

    The following 8 patches enabling fsl-dma and talitos offload raid
    operations for improving raid performance and balancing CPU load.

    These patches include talitos, fsl-dma and carma module (caram uses
    some features of fsl-dma).

    Write performance will be improved by 25-30% tested by iozone.
    Write performance is improved about 2% after using spin_lock_bh replace
    CPU load will be reduced by 8%.

    "fwiw, I gave v5 a test-drive, setting up a RAID5 array on ramdisks
    [1], and this patchseries, along with FSL_DMA && NET_DMA set seems
    to be holding water, so this series gets my:"

    Tested-by: Kim Phillips <>

    [1] mdadm --create --verbose --force /dev/md0 --level=raid5 --raid-devices=4 \

    Changes in v7:
    - add test result which is provided by Kim Phillips;
    - correct one coding style issue in patch 5/8;
    - add comments by Arnd Bergmann in patch 6/8;

    Changes in v6:
    - swap the order of original patch 3/6 and 4/6;
    - merge Ira's patch to reduce the size of original patch;
    - merge Ira's patch of carma in 8/8;
    - update documents and descriptions according to Ira's advice;

    Changes in v5:
    - add detail description in patch 3/6 about the process of completed
    descriptor, the process is in align with fsl-dma Reference Manual,
    illustrate the potential risk and how to reproduce it;
    - drop the patch 7/7 in v4 according to Timur's comments;

    Changes in v4:
    - fix an error in talitos when dest addr is same with src addr, dest
    should be freed only one time if src is same with dest addr;
    - correct coding style in fsl-dma according to Ira's comments;
    - fix a race condition in fsl-dma fsl_tx_status(), remove the interface
    which is used to free descriptors in queue ld_completed, this interface
    has been included in fsldma_cleanup_descriptor(), in v3, there is one
    place missed spin_lock protect;
    - split the original patch 3/4 up to 2 patches 3/7 and 4/7 according to
    Li Yang's comments;
    - fix a warning of unitialized cookie;
    - add memory copy self test in fsl-dma;
    - add more detail description about use spin_lock_bh() to instead of
    spin_lock_irqsave() according to Timur's comments.

    Changes in v3:
    - change release process of fsl-dma descriptor for resolve the
    potential race condition;
    - add test result when use spin_lock_bh replace spin_lock_irqsave;
    - modify the benchmark results according to the latest patch.

    Changes in v2:
    - rebase onto cryptodev tree;
    - split the patch 3/4 up to 3 independent patches;
    - remove the patch 4/4, the fix is not for cryptodev tree;

    Qiang Liu (8):
    Talitos: Support for async_tx XOR offload
    fsl-dma: remove attribute DMA_INTERRUPT of dmaengine
    fsl-dma: add fsl_dma_free_descriptor() to reduce code duplication
    fsl-dma: move functions to avoid forward declarations
    fsl-dma: change release process of dma descriptor for supporting async_tx
    fsl-dma: use spin_lock_bh to instead of spin_lock_irqsave
    fsl-dma: fix a warning of unitialized cookie
    carma: remove unnecessary DMA_INTERRUPT capability

    drivers/crypto/Kconfig | 9 +
    drivers/crypto/talitos.c | 413 ++++++++++++++++++++++++++
    drivers/crypto/talitos.h | 53 ++++
    drivers/dma/fsldma.c | 488 +++++++++++++++++--------------
    drivers/dma/fsldma.h | 17 +-
    drivers/misc/carma/carma-fpga-program.c | 1 -
    drivers/misc/carma/carma-fpga.c | 2 +-
    7 files changed, 761 insertions(+), 222 deletions(-)

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      Last update: 2012-08-09 11:22    [W:0.025 / U:10.828 seconds]
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