77308e27a0
Looks like copy and paste from x86 that never actually got used. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Tony Luck <tony.luck@intel.com>
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Dynamic DMA mapping support.
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/dmar.h>
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#include <asm/iommu.h>
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#include <asm/machvec.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <asm/page.h>
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dma_addr_t bad_dma_address __read_mostly;
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EXPORT_SYMBOL(bad_dma_address);
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int no_iommu __read_mostly;
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#ifdef CONFIG_IOMMU_DEBUG
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int force_iommu __read_mostly = 1;
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#else
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int force_iommu __read_mostly;
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#endif
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int iommu_pass_through;
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extern struct dma_map_ops intel_dma_ops;
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static int __init pci_iommu_init(void)
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{
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if (iommu_detected)
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intel_iommu_init();
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return 0;
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}
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/* Must execute after PCI subsystem */
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fs_initcall(pci_iommu_init);
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void pci_iommu_shutdown(void)
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{
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return;
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}
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void __init
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iommu_dma_init(void)
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{
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return;
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}
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int iommu_dma_supported(struct device *dev, u64 mask)
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{
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/* Copied from i386. Doesn't make much sense, because it will
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only work for pci_alloc_coherent.
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The caller just has to use GFP_DMA in this case. */
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if (mask < DMA_BIT_MASK(24))
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return 0;
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return 1;
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}
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EXPORT_SYMBOL(iommu_dma_supported);
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void __init pci_iommu_alloc(void)
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{
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dma_ops = &intel_dma_ops;
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intel_dma_ops.sync_single_for_cpu = machvec_dma_sync_single;
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intel_dma_ops.sync_sg_for_cpu = machvec_dma_sync_sg;
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intel_dma_ops.sync_single_for_device = machvec_dma_sync_single;
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intel_dma_ops.sync_sg_for_device = machvec_dma_sync_sg;
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intel_dma_ops.dma_supported = iommu_dma_supported;
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/*
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* The order of these functions is important for
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* fall-back/fail-over reasons
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*/
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detect_intel_iommu();
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#ifdef CONFIG_SWIOTLB
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if (!iommu_detected) {
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#ifdef CONFIG_IA64_GENERIC
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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_dma_init();
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#else
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panic("Unable to find Intel IOMMU");
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#endif /* CONFIG_IA64_GENERIC */
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}
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#endif /* CONFIG_SWIOTLB */
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}
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