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| author |   Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2017-02-07 19:58:02 +0200 |
|---|---|---|
| committer |   Konrad Rzeszutek Wilk <konrad@kernel.org> | 2017-02-13 14:15:12 -0500 |
| commit | 7e91c7df29b5e196de3dc6f086c8937973bd0b88 (patch) | |
| tree | 0b54eb24f0a97b969a14eebcc05546f1910b9db2 /drivers/xen | |
| parent | swiotlb: ensure that page-sized mappings are page-aligned (diff) | |
| download | wireguard-linux-7e91c7df29b5e196de3dc6f086c8937973bd0b88.tar.xz wireguard-linux-7e91c7df29b5e196de3dc6f086c8937973bd0b88.zip | |
swiotlb-xen: implement xen_swiotlb_dma_mmap callback
This function creates userspace mapping for the DMA-coherent memory.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>
Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/swiotlb-xen.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index f905d6eeb048..c7f61fc0572a 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -680,3 +680,22 @@ xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask) return 0; } EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask); + +/* + * Create userspace mapping for the DMA-coherent memory. + * This function should be called with the pages from the current domain only, + * passing pages mapped from other domains would lead to memory corruption. + */ +int +xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs) +{ +#if defined(CONFIG_ARM) || defined(CONFIG_ARM64) + if (__generic_dma_ops(dev)->mmap) + return __generic_dma_ops(dev)->mmap(dev, vma, cpu_addr, + dma_addr, size, attrs); +#endif + return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size); +} +EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mmap); |