arch/ia64/kernel/pci-swiotlb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Glue code to lib/swiotlb.c */
   3
   4 #include <linux/pci.h>
   5 #include <linux/gfp.h>
   6 #include <linux/cache.h>
   7 #include <linux/module.h>
   8 #include <linux/dma-mapping.h>
   9
  10 #include <asm/swiotlb.h>
  11 #include <asm/dma.h>
  12 #include <asm/iommu.h>
  13 #include <asm/machvec.h>
  14
  15 int swiotlb __read_mostly;
  16 EXPORT_SYMBOL(swiotlb);
  17
  18 static void *ia64_swiotlb_alloc_coherent(struct device *dev, size_t size,
  19                                          dma_addr_t *dma_handle, gfp_t gfp,
  20                                          unsigned long attrs)
  21 {
  22         if (dev->coherent_dma_mask != DMA_BIT_MASK(64))
  23                 gfp |= GFP_DMA;
  24         return swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
  25 }
  26
  27 static void ia64_swiotlb_free_coherent(struct device *dev, size_t size,
  28                                        void *vaddr, dma_addr_t dma_addr,
  29                                        unsigned long attrs)
  30 {
  31         swiotlb_free_coherent(dev, size, vaddr, dma_addr);
  32 }
  33
  34 const struct dma_map_ops swiotlb_dma_ops = {
  35         .alloc = ia64_swiotlb_alloc_coherent,
  36         .free = ia64_swiotlb_free_coherent,
  37         .map_page = swiotlb_map_page,
  38         .unmap_page = swiotlb_unmap_page,
  39         .map_sg = swiotlb_map_sg_attrs,
  40         .unmap_sg = swiotlb_unmap_sg_attrs,
  41         .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
  42         .sync_single_for_device = swiotlb_sync_single_for_device,
  43         .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
  44         .sync_sg_for_device = swiotlb_sync_sg_for_device,
  45         .dma_supported = swiotlb_dma_supported,
  46         .mapping_error = swiotlb_dma_mapping_error,
  47 };
  48
  49 void __init swiotlb_dma_init(void)
  50 {
  51         dma_ops = &swiotlb_dma_ops;
  52         swiotlb_init(1);
  53 }
  54
  55 void __init pci_swiotlb_init(void)
  56 {
  57         if (!iommu_detected) {
  58 #ifdef CONFIG_IA64_GENERIC
  59                 swiotlb = 1;
  60                 printk(KERN_INFO "PCI-DMA: Re-initialize machine vector.\n");
  61                 machvec_init("dig");
  62                 swiotlb_init(1);
  63                 dma_ops = &swiotlb_dma_ops;
  64 #else
  65                 panic("Unable to find Intel IOMMU");
  66 #endif
  67         }
  68 }