root/arch/x86/kernel/pci-swiotlb_64.c

DEFINITIONS

1. swiotlb_map_single_phys
2. pci_swiotlb_init

/* 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;

static dma_addr_t
swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
                        int direction)
{
        return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
}

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_phys,
        .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 && max_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;
        }
}