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dma: Introduce dma_max_mapping_size()

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The function returns the maximum size that can be mapped
using DMA-API functions. The patch also adds the
implementation for direct DMA and a new dma_map_ops pointer
so that other implementations can expose their limit.

Cc: stable@vger.kernel.org
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Joerg Roedel 2019-02-07 12:59:15 +01:00 • committed by Michael S. Tsirkin
parent 492366f7b4
commit 133d624b1c
4 changed files with 41 additions and 0 deletions
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8
include/linux/dma-mapping.h
View file

@ -130,6 +130,7 @@ struct dma_map_ops {
enum dma_data_direction direction);
int (*dma_supported)(struct device *dev, u64 mask);
u64 (*get_required_mask)(struct device *dev);
size_t (*max_mapping_size)(struct device *dev);
};
#define DMA_MAPPING_ERROR (~(dma_addr_t)0)
@ -257,6 +258,8 @@ static inline void dma_direct_sync_sg_for_cpu(struct device *dev,
}
#endif
size_t dma_direct_max_mapping_size(struct device *dev);
#ifdef CONFIG_HAS_DMA
#include <asm/dma-mapping.h>
@ -460,6 +463,7 @@ int dma_supported(struct device *dev, u64 mask);
int dma_set_mask(struct device *dev, u64 mask);
int dma_set_coherent_mask(struct device *dev, u64 mask);
u64 dma_get_required_mask(struct device *dev);
size_t dma_max_mapping_size(struct device *dev);
#else /* CONFIG_HAS_DMA */
static inline dma_addr_t dma_map_page_attrs(struct device *dev,
struct page *page, size_t offset, size_t size,
@ -561,6 +565,10 @@ static inline u64 dma_get_required_mask(struct device *dev)
{
return 0;
}
static inline size_t dma_max_mapping_size(struct device *dev)
{
return 0;
}
#endif /* CONFIG_HAS_DMA */
static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,