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Tip revision: c698ca5278934c0ae32297a8725ced2e27585d7f authored by Linus Torvalds on 19 March 2018, 00:48:42 UTC
Linux 4.16-rc6
Linux 4.16-rc6
Tip revision: c698ca5
dma-direct.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_DMA_DIRECT_H
#define _LINUX_DMA_DIRECT_H 1
#include <linux/dma-mapping.h>
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
#include <asm/dma-direct.h>
#else
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
dma_addr_t dev_addr = (dma_addr_t)paddr;
return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
{
phys_addr_t paddr = (phys_addr_t)dev_addr;
return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
}
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
if (!dev->dma_mask)
return false;
return addr + size - 1 <= *dev->dma_mask;
}
#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
void dma_mark_clean(void *addr, size_t size);
#else
static inline void dma_mark_clean(void *addr, size_t size)
{
}
#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs);
int dma_direct_supported(struct device *dev, u64 mask);
#endif /* _LINUX_DMA_DIRECT_H */