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[PATCH] cciss: disable DMA prefetch on P600

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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@hp.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mike Miller 2006-12-06 20:35:04 -08:00 committed by Linus Torvalds
parent de92391671
commit f92e2f5f88
2 changed files with 12 additions and 0 deletions
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11
drivers/block/cciss.c
View file

@ -3003,6 +3003,17 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
}
#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 */

1
drivers/block/cciss_cmd.h
View file

@ -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