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    Subject[PATCH 2/2] cciss: disable dma prefetch for P600
    PATCH 2/2
    Turned off DMA prefetch for the P600 on systems which may present
    discontiguous memory.

    ---
    commit 68e76156e7a203a86996ac99c1326f098d3191f6
    tree b191a99ae1bfa6588860136265f11f9ef789683a
    parent 499cc64fc708f3a25985bea3b77b40c3448ccbf8
    author Mike Miller <mikem@beardog.cca.cpqcorp.net> Tue, 17 Oct 2006 16:02:22 -0500
    committer Mike Miller <mikem@beardog.cca.cpqcorp.net> Tue, 17 Oct 2006 16:02:22 -0500

    Signed-off-by: Mike Miller <mikem@beardog.cca.cpqcorp.net>

    drivers/block/cciss.c | 15 +++++++++++++++
    1 files changed, 15 insertions(+), 0 deletions(-)

    diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
    index a0a1dd9..b445528 100644
    --- a/drivers/block/cciss.c
    +++ b/drivers/block/cciss.c
    @@ -2982,6 +2982,21 @@ #ifdef CONFIG_X86
    }
    #endif

    +#if defined CONFIG_IA64 || if defined CONFIG_X86_64
    + {
    + /* DMA prefetch must be disabled on P600 on platforms that may
    + * present noncontiguous memory.
    + */
    +
    + __u32 dma_prefetch;
    + if(board_id == 0x3225103C) {
    + dma_prefetch = readl(c->vaddr + I2O0_DMA1_CFG);
    + dma_prefetch |= 0x8000;
    + writel(c->vaddr + I2O0_DMA1_CFG, dma_prefetch);
    + }
    + }
    +#endif /* CONFIG_IA64 || CONFIG_X86_64 */
    +
    #ifdef CCISS_DEBUG
    printk("Trying to put board into Simple mode\n");
    #endif /* CCISS_DEBUG */
    -
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