pci-swiotlb.c

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/* Glue code to lib/swiotlb.c */

#include <linux/pci.h>
#include <linux/gfp.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,
                     struct dma_attrs *attrs)
{
    if (dev->coherent_dma_mask != DMA_BIT_MASK(64))
        gfp |= GFP_DMA;
    return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
}

static void ia64_swiotlb_free_coherent(struct device *dev, size_t size,
                       void *vaddr, dma_addr_t dma_addr,
                       struct dma_attrs *attrs)
{
    swiotlb_free_coherent(dev, size, vaddr, dma_addr);
}

struct dma_map_ops swiotlb_dma_ops = {
    .alloc = ia64_swiotlb_alloc_coherent,
    .free = ia64_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_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(1);
}

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(1);
        dma_ops = &swiotlb_dma_ops;
#else
        panic("Unable to find Intel IOMMU");
#endif
    }
}