Stefano Stabellini | 5121872 | 2014-11-21 11:06:39 +0000 | [diff] [blame] | 1 | #include <linux/cpu.h> |
| 2 | #include <linux/dma-mapping.h> |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 3 | #include <linux/bootmem.h> |
| 4 | #include <linux/gfp.h> |
Stefano Stabellini | 5121872 | 2014-11-21 11:06:39 +0000 | [diff] [blame] | 5 | #include <linux/highmem.h> |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 6 | #include <linux/export.h> |
Stefano Stabellini | 5121872 | 2014-11-21 11:06:39 +0000 | [diff] [blame] | 7 | #include <linux/of_address.h> |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 8 | #include <linux/slab.h> |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/dma-mapping.h> |
| 11 | #include <linux/vmalloc.h> |
| 12 | #include <linux/swiotlb.h> |
| 13 | |
| 14 | #include <xen/xen.h> |
Stefano Stabellini | da095a9 | 2014-11-21 11:08:39 +0000 | [diff] [blame] | 15 | #include <xen/interface/grant_table.h> |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 16 | #include <xen/interface/memory.h> |
| 17 | #include <xen/swiotlb-xen.h> |
| 18 | |
| 19 | #include <asm/cacheflush.h> |
| 20 | #include <asm/xen/page.h> |
| 21 | #include <asm/xen/hypercall.h> |
| 22 | #include <asm/xen/interface.h> |
| 23 | |
Stefano Stabellini | 5121872 | 2014-11-21 11:06:39 +0000 | [diff] [blame] | 24 | enum dma_cache_op { |
| 25 | DMA_UNMAP, |
| 26 | DMA_MAP, |
| 27 | }; |
Stefano Stabellini | da095a9 | 2014-11-21 11:08:39 +0000 | [diff] [blame] | 28 | static bool hypercall_cflush = false; |
Stefano Stabellini | 5121872 | 2014-11-21 11:06:39 +0000 | [diff] [blame] | 29 | |
| 30 | /* functions called by SWIOTLB */ |
| 31 | |
| 32 | static void dma_cache_maint(dma_addr_t handle, unsigned long offset, |
| 33 | size_t size, enum dma_data_direction dir, enum dma_cache_op op) |
| 34 | { |
Stefano Stabellini | da095a9 | 2014-11-21 11:08:39 +0000 | [diff] [blame] | 35 | struct gnttab_cache_flush cflush; |
Stefano Stabellini | 5121872 | 2014-11-21 11:06:39 +0000 | [diff] [blame] | 36 | unsigned long pfn; |
| 37 | size_t left = size; |
| 38 | |
| 39 | pfn = (handle >> PAGE_SHIFT) + offset / PAGE_SIZE; |
| 40 | offset %= PAGE_SIZE; |
| 41 | |
| 42 | do { |
| 43 | size_t len = left; |
| 44 | |
Stefano Stabellini | da095a9 | 2014-11-21 11:08:39 +0000 | [diff] [blame] | 45 | /* buffers in highmem or foreign pages cannot cross page |
| 46 | * boundaries */ |
| 47 | if (len + offset > PAGE_SIZE) |
| 48 | len = PAGE_SIZE - offset; |
| 49 | |
| 50 | cflush.op = 0; |
| 51 | cflush.a.dev_bus_addr = pfn << PAGE_SHIFT; |
| 52 | cflush.offset = offset; |
| 53 | cflush.length = len; |
| 54 | |
| 55 | if (op == DMA_UNMAP && dir != DMA_TO_DEVICE) |
| 56 | cflush.op = GNTTAB_CACHE_INVAL; |
| 57 | if (op == DMA_MAP) { |
| 58 | if (dir == DMA_FROM_DEVICE) |
| 59 | cflush.op = GNTTAB_CACHE_INVAL; |
| 60 | else |
| 61 | cflush.op = GNTTAB_CACHE_CLEAN; |
| 62 | } |
| 63 | if (cflush.op) |
| 64 | HYPERVISOR_grant_table_op(GNTTABOP_cache_flush, &cflush, 1); |
Stefano Stabellini | 5121872 | 2014-11-21 11:06:39 +0000 | [diff] [blame] | 65 | |
| 66 | offset = 0; |
| 67 | pfn++; |
| 68 | left -= len; |
| 69 | } while (left); |
| 70 | } |
| 71 | |
| 72 | static void __xen_dma_page_dev_to_cpu(struct device *hwdev, dma_addr_t handle, |
| 73 | size_t size, enum dma_data_direction dir) |
| 74 | { |
| 75 | dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_UNMAP); |
| 76 | } |
| 77 | |
| 78 | static void __xen_dma_page_cpu_to_dev(struct device *hwdev, dma_addr_t handle, |
| 79 | size_t size, enum dma_data_direction dir) |
| 80 | { |
| 81 | dma_cache_maint(handle & PAGE_MASK, handle & ~PAGE_MASK, size, dir, DMA_MAP); |
| 82 | } |
| 83 | |
| 84 | void __xen_dma_map_page(struct device *hwdev, struct page *page, |
| 85 | dma_addr_t dev_addr, unsigned long offset, size_t size, |
| 86 | enum dma_data_direction dir, struct dma_attrs *attrs) |
| 87 | { |
| 88 | if (is_device_dma_coherent(hwdev)) |
| 89 | return; |
| 90 | if (dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) |
| 91 | return; |
| 92 | |
| 93 | __xen_dma_page_cpu_to_dev(hwdev, dev_addr, size, dir); |
| 94 | } |
| 95 | |
| 96 | void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, |
| 97 | size_t size, enum dma_data_direction dir, |
| 98 | struct dma_attrs *attrs) |
| 99 | |
| 100 | { |
| 101 | if (is_device_dma_coherent(hwdev)) |
| 102 | return; |
| 103 | if (dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) |
| 104 | return; |
| 105 | |
| 106 | __xen_dma_page_dev_to_cpu(hwdev, handle, size, dir); |
| 107 | } |
| 108 | |
| 109 | void __xen_dma_sync_single_for_cpu(struct device *hwdev, |
| 110 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| 111 | { |
| 112 | if (is_device_dma_coherent(hwdev)) |
| 113 | return; |
| 114 | __xen_dma_page_dev_to_cpu(hwdev, handle, size, dir); |
| 115 | } |
| 116 | |
| 117 | void __xen_dma_sync_single_for_device(struct device *hwdev, |
| 118 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| 119 | { |
| 120 | if (is_device_dma_coherent(hwdev)) |
| 121 | return; |
| 122 | __xen_dma_page_cpu_to_dev(hwdev, handle, size, dir); |
| 123 | } |
| 124 | |
Stefano Stabellini | a4dba13 | 2014-11-21 11:07:39 +0000 | [diff] [blame] | 125 | bool xen_arch_need_swiotlb(struct device *dev, |
| 126 | unsigned long pfn, |
| 127 | unsigned long mfn) |
| 128 | { |
Stefano Stabellini | da095a9 | 2014-11-21 11:08:39 +0000 | [diff] [blame] | 129 | return (!hypercall_cflush && (pfn != mfn) && !is_device_dma_coherent(dev)); |
Stefano Stabellini | a4dba13 | 2014-11-21 11:07:39 +0000 | [diff] [blame] | 130 | } |
| 131 | |
Stefano Stabellini | 1b65c4e | 2013-10-10 13:41:10 +0000 | [diff] [blame] | 132 | int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order, |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 133 | unsigned int address_bits, |
| 134 | dma_addr_t *dma_handle) |
| 135 | { |
| 136 | if (!xen_initial_domain()) |
| 137 | return -EINVAL; |
| 138 | |
| 139 | /* we assume that dom0 is mapped 1:1 for now */ |
Stefano Stabellini | 1b65c4e | 2013-10-10 13:41:10 +0000 | [diff] [blame] | 140 | *dma_handle = pstart; |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 141 | return 0; |
| 142 | } |
| 143 | EXPORT_SYMBOL_GPL(xen_create_contiguous_region); |
| 144 | |
Stefano Stabellini | 1b65c4e | 2013-10-10 13:41:10 +0000 | [diff] [blame] | 145 | void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order) |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 146 | { |
| 147 | return; |
| 148 | } |
| 149 | EXPORT_SYMBOL_GPL(xen_destroy_contiguous_region); |
| 150 | |
| 151 | struct dma_map_ops *xen_dma_ops; |
Chuck Tuffli | 35c8ab4 | 2014-12-21 12:30:58 -0800 | [diff] [blame] | 152 | EXPORT_SYMBOL(xen_dma_ops); |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 153 | |
| 154 | static struct dma_map_ops xen_swiotlb_dma_ops = { |
| 155 | .mapping_error = xen_swiotlb_dma_mapping_error, |
| 156 | .alloc = xen_swiotlb_alloc_coherent, |
| 157 | .free = xen_swiotlb_free_coherent, |
| 158 | .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu, |
| 159 | .sync_single_for_device = xen_swiotlb_sync_single_for_device, |
| 160 | .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu, |
| 161 | .sync_sg_for_device = xen_swiotlb_sync_sg_for_device, |
| 162 | .map_sg = xen_swiotlb_map_sg_attrs, |
| 163 | .unmap_sg = xen_swiotlb_unmap_sg_attrs, |
| 164 | .map_page = xen_swiotlb_map_page, |
| 165 | .unmap_page = xen_swiotlb_unmap_page, |
| 166 | .dma_supported = xen_swiotlb_dma_supported, |
Stefano Stabellini | eb1ddc0 | 2013-10-09 16:56:33 +0000 | [diff] [blame] | 167 | .set_dma_mask = xen_swiotlb_set_dma_mask, |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 168 | }; |
| 169 | |
| 170 | int __init xen_mm_init(void) |
| 171 | { |
Stefano Stabellini | da095a9 | 2014-11-21 11:08:39 +0000 | [diff] [blame] | 172 | struct gnttab_cache_flush cflush; |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 173 | if (!xen_initial_domain()) |
| 174 | return 0; |
| 175 | xen_swiotlb_init(1, false); |
| 176 | xen_dma_ops = &xen_swiotlb_dma_ops; |
Stefano Stabellini | da095a9 | 2014-11-21 11:08:39 +0000 | [diff] [blame] | 177 | |
| 178 | cflush.op = 0; |
| 179 | cflush.a.dev_bus_addr = 0; |
| 180 | cflush.offset = 0; |
| 181 | cflush.length = 0; |
| 182 | if (HYPERVISOR_grant_table_op(GNTTABOP_cache_flush, &cflush, 1) != -ENOSYS) |
| 183 | hypercall_cflush = true; |
Stefano Stabellini | 83862cc | 2013-10-10 13:40:44 +0000 | [diff] [blame] | 184 | return 0; |
| 185 | } |
| 186 | arch_initcall(xen_mm_init); |