1 #include <linux/bootmem.h> 2 #include <linux/gfp.h> 3 #include <linux/export.h> 4 #include <linux/slab.h> 5 #include <linux/types.h> 6 #include <linux/dma-mapping.h> 7 #include <linux/vmalloc.h> 8 #include <linux/swiotlb.h> 9 10 #include <xen/xen.h> 11 #include <xen/interface/memory.h> 12 #include <xen/swiotlb-xen.h> 13 14 #include <asm/cacheflush.h> 15 #include <asm/xen/page.h> 16 #include <asm/xen/hypercall.h> 17 #include <asm/xen/interface.h> 18 19 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order, 20 unsigned int address_bits, 21 dma_addr_t *dma_handle) 22 { 23 if (!xen_initial_domain()) 24 return -EINVAL; 25 26 /* we assume that dom0 is mapped 1:1 for now */ 27 *dma_handle = pstart; 28 return 0; 29 } 30 EXPORT_SYMBOL_GPL(xen_create_contiguous_region); 31 32 void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order) 33 { 34 return; 35 } 36 EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region); 37 38 struct dma_map_ops *xen_dma_ops; 39 EXPORT_SYMBOL_GPL(xen_dma_ops); 40 41 static struct dma_map_ops xen_swiotlb_dma_ops = { 42 .mapping_error = xen_swiotlb_dma_mapping_error, 43 .alloc = xen_swiotlb_alloc_coherent, 44 .free = xen_swiotlb_free_coherent, 45 .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu, 46 .sync_single_for_device = xen_swiotlb_sync_single_for_device, 47 .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu, 48 .sync_sg_for_device = xen_swiotlb_sync_sg_for_device, 49 .map_sg = xen_swiotlb_map_sg_attrs, 50 .unmap_sg = xen_swiotlb_unmap_sg_attrs, 51 .map_page = xen_swiotlb_map_page, 52 .unmap_page = xen_swiotlb_unmap_page, 53 .dma_supported = xen_swiotlb_dma_supported, 54 .set_dma_mask = xen_swiotlb_set_dma_mask, 55 }; 56 57 int __init xen_mm_init(void) 58 { 59 if (!xen_initial_domain()) 60 return 0; 61 xen_swiotlb_init(1, false); 62 xen_dma_ops = &xen_swiotlb_dma_ops; 63 return 0; 64 } 65 arch_initcall(xen_mm_init); 66