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cciss: factor out cciss_p600_dma_prefetch_quirk()

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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>
This commit is contained in:
Stephen M. Cameron 2010-07-19 13:45:46 -05:00 committed by Jens Axboe
parent 322e304c4d
commit bfd63ee571
1 changed files with 19 additions and 18 deletions
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37
drivers/block/cciss.c
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@ -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 */