[PATCH 13/26] cciss: factor out cciss_p600_dma_prefetch_quirk()
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From: Stephen M. Cameron on 19 Jul 2010 14:50 From: Stephen M. Cameron <scameron(a)beardog.cce.hp.com> cciss: factor out cciss_p600_dma_prefetch_quirk() Signed-off-by: Stephen M. Cameron <scameron(a)beardog.cce.hp.com> --- drivers/block/cciss.c | 37 +++++++++++++++++++------------------ 1 files changed, 19 insertions(+), 18 deletions(-) diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index b4264bc..e1c2bf1 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -4120,6 +4120,24 @@ static inline void cciss_enable_scsi_prefetch(ctlr_info_t *h) #endif } +/* Disable DMA prefetch for the P600. Otherwise an ASIC bug may result + * in a prefetch beyond physical memory. + */ +static inline void cciss_p600_dma_prefetch_quirk(ctlr_info_t *h) +{ + u32 dma_prefetch; + __u32 dma_refetch; + + if (h->board_id != 0x3225103C) + return; + dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG); + dma_prefetch |= 0x8000; + writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG); + pci_read_config_dword(h->pdev, PCI_COMMAND_PARITY, &dma_refetch); + dma_refetch |= 0x1; + pci_write_config_dword(h->pdev, PCI_COMMAND_PARITY, dma_refetch); +} + static int __devinit cciss_pci_init(ctlr_info_t *c) { int prod_index, err; @@ -4182,24 +4200,7 @@ static int __devinit cciss_pci_init(ctlr_info_t *c) goto err_out_free_res; } cciss_enable_scsi_prefetch(c); - /* 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 (c->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(c->pdev, PCI_COMMAND_PARITY, - &dma_refetch); - dma_refetch |= 0x1; - pci_write_config_dword(c->pdev, PCI_COMMAND_PARITY, - dma_refetch); - } - + cciss_p600_dma_prefetch_quirk(c); #ifdef CCISS_DEBUG printk(KERN_WARNING "Trying to put board into Performant mode\n"); #endif /* CCISS_DEBUG */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |