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pci-swiotlb.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/swiotlb.h>
#include <asm/dma.h>
#include <asm/iommu.h>
#include <asm/machvec.h>

int swiotlb __read_mostly;
EXPORT_SYMBOL(swiotlb);

static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
                               dma_addr_t *dma_handle, gfp_t gfp)
{
      if (dev->coherent_dma_mask != DMA_BIT_MASK(64))
            gfp |= GFP_DMA;
      return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
}

struct dma_map_ops swiotlb_dma_ops = {
      .alloc_coherent = ia64_swiotlb_alloc_coherent,
      .free_coherent = swiotlb_free_coherent,
      .map_page = swiotlb_map_page,
      .unmap_page = swiotlb_unmap_page,
      .map_sg = swiotlb_map_sg_attrs,
      .unmap_sg = swiotlb_unmap_sg_attrs,
      .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,
      .dma_supported = swiotlb_dma_supported,
      .mapping_error = swiotlb_dma_mapping_error,
};

void __init swiotlb_dma_init(void)
{
      dma_ops = &swiotlb_dma_ops;
      swiotlb_init();
}

void __init pci_swiotlb_init(void)
{
      if (!iommu_detected) {
#ifdef CONFIG_IA64_GENERIC
            swiotlb = 1;
            printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
            machvec_init("dig");
            swiotlb_init();
            dma_ops = &swiotlb_dma_ops;
#else
            panic("Unable to find Intel IOMMU");
#endif
      }
}

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