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cciss: factor out cciss_p600_dma_prefetch_quirk()
cciss: factor out cciss_p600_dma_prefetch_quirk() Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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@ -4120,6 +4120,24 @@ static inline void cciss_enable_scsi_prefetch(ctlr_info_t *h)
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#endif
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}
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/* Disable DMA prefetch for the P600. Otherwise an ASIC bug may result
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* in a prefetch beyond physical memory.
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*/
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static inline void cciss_p600_dma_prefetch_quirk(ctlr_info_t *h)
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{
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u32 dma_prefetch;
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__u32 dma_refetch;
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if (h->board_id != 0x3225103C)
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return;
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dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG);
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dma_prefetch |= 0x8000;
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writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG);
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pci_read_config_dword(h->pdev, PCI_COMMAND_PARITY, &dma_refetch);
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dma_refetch |= 0x1;
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pci_write_config_dword(h->pdev, PCI_COMMAND_PARITY, dma_refetch);
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}
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static int __devinit cciss_pci_init(ctlr_info_t *c)
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{
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int prod_index, err;
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@ -4182,24 +4200,7 @@ static int __devinit cciss_pci_init(ctlr_info_t *c)
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goto err_out_free_res;
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}
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cciss_enable_scsi_prefetch(c);
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/* Disabling DMA prefetch and refetch for the P600.
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* An ASIC bug may result in accesses to invalid memory addresses.
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* We've disabled prefetch for some time now. Testing with XEN
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* kernels revealed a bug in the refetch if dom0 resides on a P600.
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*/
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if (c->board_id == 0x3225103C) {
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__u32 dma_prefetch;
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__u32 dma_refetch;
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dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG);
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dma_prefetch |= 0x8000;
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writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG);
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pci_read_config_dword(c->pdev, PCI_COMMAND_PARITY,
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&dma_refetch);
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dma_refetch |= 0x1;
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pci_write_config_dword(c->pdev, PCI_COMMAND_PARITY,
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dma_refetch);
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}
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cciss_p600_dma_prefetch_quirk(c);
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#ifdef CCISS_DEBUG
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printk(KERN_WARNING "Trying to put board into Performant mode\n");
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#endif /* CCISS_DEBUG */
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