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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved
*
* DMA operations that map physical memory through IOMMU.
*/
#ifndef _LINUX_IOMMU_DMA_H
#define _LINUX_IOMMU_DMA_H
#include <linux/dma-direction.h>
#ifdef CONFIG_IOMMU_DMA
static inline bool use_dma_iommu(struct device *dev)
{
return dev->dma_iommu;
}
dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs);
void iommu_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir, unsigned long attrs);
int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir, unsigned long attrs);
void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir, unsigned long attrs);
void *iommu_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
gfp_t gfp, unsigned long attrs);
int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
unsigned long iommu_dma_get_merge_boundary(struct device *dev);
size_t iommu_dma_opt_mapping_size(void);
size_t iommu_dma_max_mapping_size(struct device *dev);
void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t handle, unsigned long attrs);
dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
size_t size, enum dma_data_direction dir, unsigned long attrs);
void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir, unsigned long attrs);
struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
enum dma_data_direction dir, gfp_t gfp, unsigned long attrs);
void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
struct sg_table *sgt, enum dma_data_direction dir);
void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir);
void iommu_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir);
void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir);
void iommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir);
#else
static inline bool use_dma_iommu(struct device *dev)
{
return false;
}
static inline dma_addr_t iommu_dma_map_page(struct device *dev,
struct page *page, unsigned long offset, size_t size,
enum dma_data_direction dir, unsigned long attrs)
{
return DMA_MAPPING_ERROR;
}
static inline void iommu_dma_unmap_page(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
}
static inline int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
return -EINVAL;
}
static inline void iommu_dma_unmap_sg(struct device *dev,
struct scatterlist *sg, int nents, enum dma_data_direction dir,
unsigned long attrs)
{
}
static inline void *iommu_dma_alloc(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
{
return NULL;
}
static inline int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
return -EINVAL;
}
static inline int iommu_dma_get_sgtable(struct device *dev,
struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr,
size_t size, unsigned long attrs)
{
return -EINVAL;
}
static inline unsigned long iommu_dma_get_merge_boundary(struct device *dev)
{
return 0;
}
static inline size_t iommu_dma_opt_mapping_size(void)
{
return 0;
}
static inline size_t iommu_dma_max_mapping_size(struct device *dev)
{
return 0;
}
static inline void iommu_dma_free(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t handle, unsigned long attrs)
{
}
static inline dma_addr_t iommu_dma_map_resource(struct device *dev,
phys_addr_t phys, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
return DMA_MAPPING_ERROR;
}
static inline void iommu_dma_unmap_resource(struct device *dev,
dma_addr_t handle, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
}
static inline struct sg_table *
iommu_dma_alloc_noncontiguous(struct device *dev, size_t size,
enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
{
return NULL;
}
static inline void iommu_dma_free_noncontiguous(struct device *dev, size_t size,
struct sg_table *sgt, enum dma_data_direction dir)
{
}
static inline void iommu_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
{
}
static inline void iommu_dma_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
{
}
static inline void iommu_dma_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir)
{
}
static inline void iommu_dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir)
{
}
#endif /* CONFIG_IOMMU_DMA */
#endif /* _LINUX_IOMMU_DMA_H */
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