From: Will Davis <[email protected]> Simply pass through the physical address as the DMA address.
Signed-off-by: Will Davis <[email protected]> Reviewed-by: Terence Ripperda <[email protected]> Reviewed-by: John Hubbard <[email protected]> --- arch/x86/kernel/pci-nommu.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c index da15918..6e9e66d 100644 --- a/arch/x86/kernel/pci-nommu.c +++ b/arch/x86/kernel/pci-nommu.c @@ -38,6 +38,22 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page, return bus; } +static dma_addr_t nommu_map_resource(struct device *dev, struct resource *res, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + dma_addr_t bus = res->start + offset; + + WARN_ON(size == 0); + + if (!check_addr("map_resource", dev, bus, size)) + return DMA_ERROR_CODE; + flush_write_buffers(); + return bus; +} + + /* Map a set of buffers described by scatterlist in streaming * mode for DMA. This is the scatter-gather version of the * above pci_map_single interface. Here the scatter gather list @@ -93,6 +109,7 @@ struct dma_map_ops nommu_dma_ops = { .free = dma_generic_free_coherent, .map_sg = nommu_map_sg, .map_page = nommu_map_page, + .map_resource = nommu_map_resource, .sync_single_for_device = nommu_sync_single_for_device, .sync_sg_for_device = nommu_sync_sg_for_device, .is_phys = 1, -- 2.3.7 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
