The patch titled
cciss: disable dma prefetch for P600
has been added to the -mm tree. Its filename is
cciss-disable-dma-prefetch-for-p600.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: cciss: disable dma prefetch for P600
From: "Mike Miller (OS Dev)" <mikem@xxxxxxxxxxxxxxxxxxxxxxx>
Turn off DMA prefetch for the P600 on systems which may present
discontiguous memory.
Signed-off-by: Mike Miller <mikem@xxxxxxxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/block/cciss.c | 15 +++++++++++++++
1 files changed, 15 insertions(+)
diff -puN drivers/block/cciss.c~cciss-disable-dma-prefetch-for-p600 drivers/block/cciss.c
--- a/drivers/block/cciss.c~cciss-disable-dma-prefetch-for-p600
+++ a/drivers/block/cciss.c
@@ -2982,6 +2982,21 @@ static int cciss_pci_init(ctlr_info_t *c
}
#endif
+#if defined(CONFIG_IA64) || 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 */
_
Patches currently in -mm which might be from mikem@xxxxxxxxxxxxxxxxxxxxxxx are
cciss-change-pci-id-for-bug-workaround.patch
cciss-disable-dma-prefetch-for-p600.patch
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