mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 10:13:58 +07:00
ea8c64ace8
phys_to_dma, dma_to_phys and dma_capable are helpers published by architecture code for use of swiotlb and xen-swiotlb only. Drivers are not supposed to use these directly, but use the DMA API instead. Move these to a new asm/dma-direct.h helper, included by a linux/dma-direct.h wrapper that provides the default linear mapping unless the architecture wants to override it. In the MIPS case the existing dma-coherent.h is reused for now as untangling it will take a bit of work. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Robin Murphy <robin.murphy@arm.com>
37 lines
802 B
C
37 lines
802 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef ASM_ARM_DMA_DIRECT_H
|
|
#define ASM_ARM_DMA_DIRECT_H 1
|
|
|
|
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
|
|
{
|
|
unsigned int offset = paddr & ~PAGE_MASK;
|
|
return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
|
|
}
|
|
|
|
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
|
|
{
|
|
unsigned int offset = dev_addr & ~PAGE_MASK;
|
|
return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
|
|
}
|
|
|
|
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
|
|
{
|
|
u64 limit, mask;
|
|
|
|
if (!dev->dma_mask)
|
|
return 0;
|
|
|
|
mask = *dev->dma_mask;
|
|
|
|
limit = (mask + 1) & ~mask;
|
|
if (limit && size > limit)
|
|
return 0;
|
|
|
|
if ((addr | (addr + size - 1)) & ~mask)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
#endif /* ASM_ARM_DMA_DIRECT_H */
|