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Linux kernel mirror (for testing)
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kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_XEN_PAGE_COHERENT_H
3#define _ASM_X86_XEN_PAGE_COHERENT_H
4
5#include <asm/page.h>
6#include <linux/dma-mapping.h>
7
8static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
9 dma_addr_t *dma_handle, gfp_t flags,
10 unsigned long attrs)
11{
12 void *vstart = (void*)__get_free_pages(flags, get_order(size));
13 *dma_handle = virt_to_phys(vstart);
14 return vstart;
15}
16
17static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
18 void *cpu_addr, dma_addr_t dma_handle,
19 unsigned long attrs)
20{
21 free_pages((unsigned long) cpu_addr, get_order(size));
22}
23
24static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
25 dma_addr_t dev_addr, unsigned long offset, size_t size,
26 enum dma_data_direction dir, unsigned long attrs) { }
27
28static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
29 size_t size, enum dma_data_direction dir,
30 unsigned long attrs) { }
31
32static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
33 dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
34
35static inline void xen_dma_sync_single_for_device(struct device *hwdev,
36 dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
37
38#endif /* _ASM_X86_XEN_PAGE_COHERENT_H */