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pci-swiotlb_64.c

/* 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/gart.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;
      }
}

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