diff options
Diffstat (limited to 'arch/x86/kernel/pci-swiotlb_64.c')
| -rw-r--r-- | arch/x86/kernel/pci-swiotlb_64.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c new file mode 100644 index 000000000000..b2f405ea7c85 --- /dev/null +++ b/arch/x86/kernel/pci-swiotlb_64.c @@ -0,0 +1,44 @@ +/* Glue code to lib/swiotlb.c */ + +#include <linux/pci.h> +#include <linux/cache.h> +#include <linux/module.h> +#include <linux/dma-mapping.h> + +#include <asm/iommu.h> +#include <asm/swiotlb.h> +#include <asm/dma.h> + +int swiotlb __read_mostly; +EXPORT_SYMBOL(swiotlb); + +const struct dma_mapping_ops swiotlb_dma_ops = { + .mapping_error = swiotlb_dma_mapping_error, + .alloc_coherent = swiotlb_alloc_coherent, + .free_coherent = swiotlb_free_coherent, + .map_single = swiotlb_map_single, + .unmap_single = swiotlb_unmap_single, + .sync_single_for_cpu = swiotlb_sync_single_for_cpu, + .sync_single_for_device = swiotlb_sync_single_for_device, + .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, + .sync_single_range_for_device = swiotlb_sync_single_range_for_device, + .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, + .sync_sg_for_device = swiotlb_sync_sg_for_device, + .map_sg = swiotlb_map_sg, + .unmap_sg = swiotlb_unmap_sg, + .dma_supported = NULL, +}; + +void __init pci_swiotlb_init(void) +{ + /* don't initialize swiotlb if iommu=off (no_iommu=1) */ + if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN) + swiotlb = 1; + if (swiotlb_force) + swiotlb = 1; + if (swiotlb) { + printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n"); + swiotlb_init(); + dma_ops = &swiotlb_dma_ops; + } +} |