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
ia64_swiotlb_alloc_coherent(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t gfp,unsigned long attrs)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
ia64_swiotlb_free_coherent(struct device * dev,size_t size,void * vaddr,dma_addr_t dma_addr,unsigned long attrs)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
swiotlb_dma_init(void)49 void __init swiotlb_dma_init(void)
50 {
51 dma_ops = &swiotlb_dma_ops;
52 swiotlb_init(1);
53 }
54
pci_swiotlb_init(void)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 }
69