The patch titled
cciss: disable DMA prefetch on P600
has been added to the -mm tree. Its filename is
cciss-disable-dma-prefetch-on-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 on P600
From: Mike Miller <mike.miller@xxxxxx>
Unconditionally disable DMA prefetch on the P600 controller. An ASIC bug may
result in prefetching beyond the end of physical memory.
Signed-off-by: Mike Miller <mike.miller@xxxxxx>
Acked-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/block/cciss.c | 11 +++++++++++
drivers/block/cciss_cmd.h | 1 +
2 files changed, 12 insertions(+)
diff -puN drivers/block/cciss.c~cciss-disable-dma-prefetch-on-p600 drivers/block/cciss.c
--- a/drivers/block/cciss.c~cciss-disable-dma-prefetch-on-p600
+++ a/drivers/block/cciss.c
@@ -2997,6 +2997,17 @@ static int cciss_pci_init(ctlr_info_t *c
}
#endif
+ /* Disabling DMA prefetch for the P600
+ * An ASIC bug may result in a prefetch beyond
+ * physical memory.
+ */
+ if(board_id == 0x3225103C) {
+ __u32 dma_prefetch;
+ dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
+ dma_prefetch |= 0x8000;
+ writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
+ }
+
#ifdef CCISS_DEBUG
printk("Trying to put board into Simple mode\n");
#endif /* CCISS_DEBUG */
diff -puN drivers/block/cciss_cmd.h~cciss-disable-dma-prefetch-on-p600 drivers/block/cciss_cmd.h
--- a/drivers/block/cciss_cmd.h~cciss-disable-dma-prefetch-on-p600
+++ a/drivers/block/cciss_cmd.h
@@ -55,6 +55,7 @@
#define I2O_INT_MASK 0x34
#define I2O_IBPOST_Q 0x40
#define I2O_OBPOST_Q 0x44
+#define I2O_DMA1_CFG 0x214
//Configuration Table
#define CFGTBL_ChangeReq 0x00000001l
_
Patches currently in -mm which might be from mike.miller@xxxxxx are
cciss-version-change.patch
cciss-reference-driver-support.patch
cciss-increase-number-of-commands-on-controller.patch
cciss-fix-pci-ssid-for-the-e500-controller.patch
cciss-disable-dma-prefetch-on-p600.patch
cciss-set-sector_size-to-2048-for-performance.patch
cciss-set-sector_size-to-2048-for-performance-tidy.patch
cciss-change-cciss_open-for-consistency.patch
cciss-remove-unused-revalidate_allvol-function.patch
cciss-add-support-for-1024-logical-volumes.patch
cciss-cleanup-cciss_interrupt-mode.patch
-
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