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-rw-r--r--drivers/block/cciss.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 3fb7e8bc436d..e330c26c5ad9 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3035,15 +3035,20 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
3035 } 3035 }
3036#endif 3036#endif
3037 3037
3038 /* Disabling DMA prefetch for the P600 3038 /* Disabling DMA prefetch and refetch for the P600.
3039 * An ASIC bug may result in a prefetch beyond 3039 * An ASIC bug may result in accesses to invalid memory addresses.
3040 * physical memory. 3040 * We've disabled prefetch for some time now. Testing with XEN
3041 * kernels revealed a bug in the refetch if dom0 resides on a P600.
3041 */ 3042 */
3042 if(board_id == 0x3225103C) { 3043 if(board_id == 0x3225103C) {
3043 __u32 dma_prefetch; 3044 __u32 dma_prefetch;
3045 __u32 dma_refetch;
3044 dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG); 3046 dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
3045 dma_prefetch |= 0x8000; 3047 dma_prefetch |= 0x8000;
3046 writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG); 3048 writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
3049 pci_read_config_dword(pdev, PCI_COMMAND_PARITY, &dma_refetch);
3050 dma_refetch |= 0x1;
3051 pci_write_config_dword(pdev, PCI_COMMAND_PARITY, dma_refetch);
3047 } 3052 }
3048 3053
3049#ifdef CCISS_DEBUG 3054#ifdef CCISS_DEBUG