On 08/02/2013 03:50 AM, Russell King wrote: > We need to start treating DMA masks as something which is specific to > the bus that the device resides on, otherwise we're going to hit all > sorts of nasty issues with LPAE and 32-bit DMA controllers in >32-bit > systems, where memory is offset from PFN 0. > > In order to start doing this, we convert the DMA mask to a PFN using > the device specific dma_to_pfn() macro. This is the reverse of the > pfn_to_dma() macro which is used to get the DMA address for the device. > > This gives us a PFN mask, which we can then check against the PFN > limit of the DMA zone. > > Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk> > --- > arch/arm/mm/dma-mapping.c | 49 ++++++++++++++++++++++++++++++++++++++++---- > arch/arm/mm/init.c | 2 + > arch/arm/mm/mm.h | 2 + > 3 files changed, 48 insertions(+), 5 deletions(-) >
Tested on Arndale board with ARM_LPAE enabled. Tested-by: Tushar Behera <tushar.beh...@linaro.org> -- Tushar Behera -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
