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Commit f92e2f5f authored by Mike Miller's avatar Mike Miller Committed by Linus Torvalds
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[PATCH] cciss: disable DMA prefetch on P600 



Unconditionally disable DMA prefetch on the P600 controller.  An ASIC bug may
result in prefetching beyond the end of physical memory.

Signed-off-by: default avatarMike Miller <mike.miller@hp.com>
Acked-by: default avatarJens Axboe <jens.axboe@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent de923916

drivers/block/cciss.c

+11 −0
Original line number Diff line number Diff line
@@ -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 */

drivers/block/cciss_cmd.h

+1 −0
Original line number Diff line number Diff line
@@ -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