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https://github.com/edk2-porting/linux-next.git
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97d9800de9
Before the dma ops unification, IA64 always uses GFP_DMA for dma_alloc_coherent like: #define dma_alloc_coherent(dev, size, handle, gfp) \ platform_dma_alloc_coherent(dev, size, handle, (gfp) | GFP_DMA) This GFP_DMA enforcement doesn't make sense for IOMMUs since they can do address translation to give addresses that devices can access to. The IOMMU drivers ignore the zone flag. However, this is still necessary for swiotlb since it can't do address translation. We don't always need to use GFP_DMA for swiotlb. We need GFP_DMA for devices incapable of 64bit DMA. This patch is sorta updated version of: http://marc.info/?l=linux-kernel&m=122638215612705&w=2 Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/* Glue code to lib/swiotlb.c */
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#include <linux/pci.h>
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#include <linux/cache.h>
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <asm/swiotlb.h>
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#include <asm/dma.h>
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#include <asm/iommu.h>
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#include <asm/machvec.h>
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int swiotlb __read_mostly;
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EXPORT_SYMBOL(swiotlb);
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static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp)
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{
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if (dev->coherent_dma_mask != DMA_64BIT_MASK)
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gfp |= GFP_DMA;
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return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
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}
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struct dma_map_ops swiotlb_dma_ops = {
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.alloc_coherent = ia64_swiotlb_alloc_coherent,
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.free_coherent = swiotlb_free_coherent,
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.map_page = swiotlb_map_page,
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.unmap_page = swiotlb_unmap_page,
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.map_sg = swiotlb_map_sg_attrs,
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.unmap_sg = swiotlb_unmap_sg_attrs,
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.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
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.sync_single_for_device = swiotlb_sync_single_for_device,
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.sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
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.sync_single_range_for_device = swiotlb_sync_single_range_for_device,
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.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
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.sync_sg_for_device = swiotlb_sync_sg_for_device,
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.dma_supported = swiotlb_dma_supported,
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.mapping_error = swiotlb_dma_mapping_error,
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};
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void __init swiotlb_dma_init(void)
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{
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dma_ops = &swiotlb_dma_ops;
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swiotlb_init();
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}
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void __init pci_swiotlb_init(void)
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{
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if (!iommu_detected) {
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#ifdef CONFIG_IA64_GENERIC
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swiotlb = 1;
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printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
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machvec_init("dig");
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swiotlb_init();
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dma_ops = &swiotlb_dma_ops;
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#else
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panic("Unable to find Intel IOMMU");
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#endif
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}
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}
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