diff options
Diffstat (limited to 'drivers/block/cciss.c')
| -rw-r--r-- | drivers/block/cciss.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index ca56a0e5cd5e..7c2cfde08f18 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -3076,15 +3076,20 @@ 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. + /* Disabling DMA prefetch and refetch for the P600. + * An ASIC bug may result in accesses to invalid memory addresses. + * We've disabled prefetch for some time now. Testing with XEN + * kernels revealed a bug in the refetch if dom0 resides on a P600. */ if(board_id == 0x3225103C) { __u32 dma_prefetch; + __u32 dma_refetch; dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG); dma_prefetch |= 0x8000; writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG); + pci_read_config_dword(pdev, PCI_COMMAND_PARITY, &dma_refetch); + dma_refetch |= 0x1; + pci_write_config_dword(pdev, PCI_COMMAND_PARITY, dma_refetch); } #ifdef CCISS_DEBUG |