Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...
[sfrench/cifs-2.6.git] / arch / arm64 / mm / dma-mapping.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2012 ARM Ltd.
4  * Author: Catalin Marinas <catalin.marinas@arm.com>
5  */
6
7 #include <linux/gfp.h>
8 #include <linux/cache.h>
9 #include <linux/dma-noncoherent.h>
10 #include <linux/dma-iommu.h>
11 #include <xen/xen.h>
12 #include <xen/swiotlb-xen.h>
13
14 #include <asm/cacheflush.h>
15
16 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
17                 enum dma_data_direction dir)
18 {
19         __dma_map_area(phys_to_virt(paddr), size, dir);
20 }
21
22 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
23                 enum dma_data_direction dir)
24 {
25         __dma_unmap_area(phys_to_virt(paddr), size, dir);
26 }
27
28 void arch_dma_prep_coherent(struct page *page, size_t size)
29 {
30         __dma_flush_area(page_address(page), size);
31 }
32
33 #ifdef CONFIG_IOMMU_DMA
34 void arch_teardown_dma_ops(struct device *dev)
35 {
36         dev->dma_ops = NULL;
37 }
38 #endif
39
40 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
41                         const struct iommu_ops *iommu, bool coherent)
42 {
43         int cls = cache_line_size_of_cpu();
44
45         WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
46                    TAINT_CPU_OUT_OF_SPEC,
47                    "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
48                    dev_driver_string(dev), dev_name(dev),
49                    ARCH_DMA_MINALIGN, cls);
50
51         dev->dma_coherent = coherent;
52         if (iommu)
53                 iommu_setup_dma_ops(dev, dma_base, size);
54
55 #ifdef CONFIG_XEN
56         if (xen_initial_domain())
57                 dev->dma_ops = &xen_swiotlb_dma_ops;
58 #endif
59 }