PATCH 5 of 8 resend
This patch unconditionally disables DMA prefetch on the P600 controller. A
bug in the ASIC may result in prefetching either beyond the end of memory
or to fall off into a memory hole.
Please consider this for inclusion.
Thanks,
mikem
Signed-off-by: Mike Miller <[email protected]>
cciss.c | 13 +++++++++++++
cciss_cmd.h | 1 +
2 files changed, 14 insertions(+)
--------------------------------------------------------------------------------
diff -urNp linux-2.6-p00004/drivers/block/cciss.c linux-2.6-p00005/drivers/block/cciss.c
--- linux-2.6-p00004/drivers/block/cciss.c 2006-10-31 15:20:25.000000000 -0600
+++ linux-2.6-p00005/drivers/block/cciss.c 2006-11-03 09:43:55.000000000 -0600
@@ -2997,6 +2997,19 @@ 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.
+ */
+ __u32 dma_prefetch
+ if(board_id == 0x3225103C) {
+ 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 -urNp linux-2.6-p00004/drivers/block/cciss_cmd.h linux-2.6-p00005/drivers/block/cciss_cmd.h
--- linux-2.6-p00004/drivers/block/cciss_cmd.h 2006-10-31 14:31:05.000000000 -0600
+++ linux-2.6-p00005/drivers/block/cciss_cmd.h 2006-10-31 15:43:18.000000000 -0600
@@ -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
-
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