diff options
Diffstat (limited to 'arch/arm64/mm/dma-mapping.c')
-rw-r--r-- | arch/arm64/mm/dma-mapping.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c new file mode 100644 index 00000000000..5eb244453a5 --- /dev/null +++ b/arch/arm64/mm/dma-mapping.c | |||
@@ -0,0 +1,79 @@ | |||
1 | /* | ||
2 | * SWIOTLB-based DMA API implementation | ||
3 | * | ||
4 | * Copyright (C) 2012 ARM Ltd. | ||
5 | * Author: Catalin Marinas <catalin.marinas@arm.com> | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License | ||
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
18 | */ | ||
19 | |||
20 | #include <linux/gfp.h> | ||
21 | #include <linux/export.h> | ||
22 | #include <linux/slab.h> | ||
23 | #include <linux/dma-mapping.h> | ||
24 | #include <linux/vmalloc.h> | ||
25 | #include <linux/swiotlb.h> | ||
26 | |||
27 | #include <asm/cacheflush.h> | ||
28 | |||
29 | struct dma_map_ops *dma_ops; | ||
30 | EXPORT_SYMBOL(dma_ops); | ||
31 | |||
32 | static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size, | ||
33 | dma_addr_t *dma_handle, gfp_t flags, | ||
34 | struct dma_attrs *attrs) | ||
35 | { | ||
36 | if (IS_ENABLED(CONFIG_ZONE_DMA32) && | ||
37 | dev->coherent_dma_mask <= DMA_BIT_MASK(32)) | ||
38 | flags |= GFP_DMA32; | ||
39 | return swiotlb_alloc_coherent(dev, size, dma_handle, flags); | ||
40 | } | ||
41 | |||
42 | static void arm64_swiotlb_free_coherent(struct device *dev, size_t size, | ||
43 | void *vaddr, dma_addr_t dma_handle, | ||
44 | struct dma_attrs *attrs) | ||
45 | { | ||
46 | swiotlb_free_coherent(dev, size, vaddr, dma_handle); | ||
47 | } | ||
48 | |||
49 | static struct dma_map_ops arm64_swiotlb_dma_ops = { | ||
50 | .alloc = arm64_swiotlb_alloc_coherent, | ||
51 | .free = arm64_swiotlb_free_coherent, | ||
52 | .map_page = swiotlb_map_page, | ||
53 | .unmap_page = swiotlb_unmap_page, | ||
54 | .map_sg = swiotlb_map_sg_attrs, | ||
55 | .unmap_sg = swiotlb_unmap_sg_attrs, | ||
56 | .sync_single_for_cpu = swiotlb_sync_single_for_cpu, | ||
57 | .sync_single_for_device = swiotlb_sync_single_for_device, | ||
58 | .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, | ||
59 | .sync_sg_for_device = swiotlb_sync_sg_for_device, | ||
60 | .dma_supported = swiotlb_dma_supported, | ||
61 | .mapping_error = swiotlb_dma_mapping_error, | ||
62 | }; | ||
63 | |||
64 | void __init swiotlb_init_with_default_size(size_t default_size, int verbose); | ||
65 | |||
66 | void __init arm64_swiotlb_init(size_t max_size) | ||
67 | { | ||
68 | dma_ops = &arm64_swiotlb_dma_ops; | ||
69 | swiotlb_init_with_default_size(min((size_t)SZ_64M, max_size), 1); | ||
70 | } | ||
71 | |||
72 | #define PREALLOC_DMA_DEBUG_ENTRIES 4096 | ||
73 | |||
74 | static int __init dma_debug_do_init(void) | ||
75 | { | ||
76 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); | ||
77 | return 0; | ||
78 | } | ||
79 | fs_initcall(dma_debug_do_init); | ||