39 lines
1.3 KiB
C
Executable file
39 lines
1.3 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_XEN_PAGE_COHERENT_H
|
|
#define _ASM_X86_XEN_PAGE_COHERENT_H
|
|
|
|
#include <asm/page.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flags,
|
|
unsigned long attrs)
|
|
{
|
|
void *vstart = (void*)__get_free_pages(flags, get_order(size));
|
|
*dma_handle = virt_to_phys(vstart);
|
|
return vstart;
|
|
}
|
|
|
|
static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
|
|
void *cpu_addr, dma_addr_t dma_handle,
|
|
unsigned long attrs)
|
|
{
|
|
free_pages((unsigned long) cpu_addr, get_order(size));
|
|
}
|
|
|
|
static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
|
|
dma_addr_t dev_addr, unsigned long offset, size_t size,
|
|
enum dma_data_direction dir, unsigned long attrs) { }
|
|
|
|
static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
|
|
size_t size, enum dma_data_direction dir,
|
|
unsigned long attrs) { }
|
|
|
|
static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
|
|
dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
|
|
|
|
static inline void xen_dma_sync_single_for_device(struct device *hwdev,
|
|
dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
|
|
|
|
#endif /* _ASM_X86_XEN_PAGE_COHERENT_H */
|