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Commit ed6ccf10 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

dma-mapping: properly stub out the DMA API for !CONFIG_HAS_DMA 



This avoids link failures in drivers using the DMA API, when they
are compiled for user mode Linux with CONFIG_COMPILE_TEST=y.

Fixes: 356da6d0 ("dma-mapping: bypass indirect calls for dma-direct")
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 4788ba57

include/linux/dma-mapping.h

+164 −91
Original line number Diff line number Diff line
@@ -194,33 +194,6 @@ static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, 
}

#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */



#ifdef CONFIG_HAS_DMA

#include <asm/dma-mapping.h>

static inline const struct dma_map_ops *get_dma_ops(struct device *dev)

{

	if (dev && dev->dma_ops)

		return dev->dma_ops;

	return get_arch_dma_ops(dev ? dev->bus : NULL);

}



static inline void set_dma_ops(struct device *dev,

			       const struct dma_map_ops *dma_ops)

{

	dev->dma_ops = dma_ops;

}

#else

/*

 * Define the dma api to allow compilation of dma dependent code.

 * Code that depends on the dma-mapping API needs to set 'depends on HAS_DMA'

 * in its Kconfig, unless it already depends on <something> || COMPILE_TEST,

 * where <something> guarantuees the availability of the dma-mapping API.

 */

static inline const struct dma_map_ops *get_dma_ops(struct device *dev)

{

	return NULL;

}

#endif



static inline bool dma_is_direct(const struct dma_map_ops *ops)

{

	return likely(!ops);
@@ -284,6 +257,22 @@ static inline void dma_direct_sync_sg_for_cpu(struct device *dev, 
}

#endif



#ifdef CONFIG_HAS_DMA

#include <asm/dma-mapping.h>



static inline const struct dma_map_ops *get_dma_ops(struct device *dev)

{

	if (dev && dev->dma_ops)

		return dev->dma_ops;

	return get_arch_dma_ops(dev ? dev->bus : NULL);

}



static inline void set_dma_ops(struct device *dev,

			       const struct dma_map_ops *dma_ops)

{

	dev->dma_ops = dma_ops;

}



static inline dma_addr_t dma_map_page_attrs(struct device *dev,

		struct page *page, size_t offset, size_t size,

		enum dma_data_direction dir, unsigned long attrs)
@@ -399,13 +388,6 @@ static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, 
	debug_dma_sync_single_for_cpu(dev, addr, size, dir);

}



static inline void dma_sync_single_range_for_cpu(struct device *dev,

		dma_addr_t addr, unsigned long offset, size_t size,

		enum dma_data_direction dir)

{

	return dma_sync_single_for_cpu(dev, addr + offset, size, dir);

}



static inline void dma_sync_single_for_device(struct device *dev,

					      dma_addr_t addr, size_t size,

					      enum dma_data_direction dir)
@@ -420,13 +402,6 @@ static inline void dma_sync_single_for_device(struct device *dev, 
	debug_dma_sync_single_for_device(dev, addr, size, dir);

}



static inline void dma_sync_single_range_for_device(struct device *dev,

		dma_addr_t addr, unsigned long offset, size_t size,

		enum dma_data_direction dir)

{

	return dma_sync_single_for_device(dev, addr + offset, size, dir);

}



static inline void

dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,

		    int nelems, enum dma_data_direction dir)
@@ -456,6 +431,138 @@ dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, 


}



static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)

{

	debug_dma_mapping_error(dev, dma_addr);



	if (dma_addr == DMA_MAPPING_ERROR)

		return -ENOMEM;

	return 0;

}



void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,

		gfp_t flag, unsigned long attrs);

void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,

		dma_addr_t dma_handle, unsigned long attrs);

void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,

		gfp_t gfp, unsigned long attrs);

void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,

		dma_addr_t dma_handle);

void dma_cache_sync(struct device *dev, void *vaddr, size_t size,

		enum dma_data_direction dir);

int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,

		void *cpu_addr, dma_addr_t dma_addr, size_t size,

		unsigned long attrs);

int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,

		void *cpu_addr, dma_addr_t dma_addr, size_t size,

		unsigned long attrs);

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);

#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,

		enum dma_data_direction dir, unsigned long attrs)

{

	return DMA_MAPPING_ERROR;

}

static inline void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr,

		size_t size, enum dma_data_direction dir, unsigned long attrs)

{

}

static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,

		int nents, enum dma_data_direction dir, unsigned long attrs)

{

	return 0;

}

static inline void dma_unmap_sg_attrs(struct device *dev,

		struct scatterlist *sg, int nents, enum dma_data_direction dir,

		unsigned long attrs)

{

}

static inline dma_addr_t dma_map_resource(struct device *dev,

		phys_addr_t phys_addr, size_t size, enum dma_data_direction dir,

		unsigned long attrs)

{

	return DMA_MAPPING_ERROR;

}

static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,

		size_t size, enum dma_data_direction dir, unsigned long attrs)

{

}

static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,

		size_t size, enum dma_data_direction dir)

{

}

static inline void dma_sync_single_for_device(struct device *dev,

		dma_addr_t addr, size_t size, enum dma_data_direction dir)

{

}

static inline void dma_sync_sg_for_cpu(struct device *dev,

		struct scatterlist *sg, int nelems, enum dma_data_direction dir)

{

}

static inline void dma_sync_sg_for_device(struct device *dev,

		struct scatterlist *sg, int nelems, enum dma_data_direction dir)

{

}

static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)

{

	return -ENOMEM;

}

static inline void *dma_alloc_attrs(struct device *dev, size_t size,

		dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs)

{

	return NULL;

}

static void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,

		dma_addr_t dma_handle, unsigned long attrs)

{

}

static inline void *dmam_alloc_attrs(struct device *dev, size_t size,

		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)

{

	return NULL;

}

static inline void dmam_free_coherent(struct device *dev, size_t size,

		void *vaddr, dma_addr_t dma_handle)

{

}

static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,

		enum dma_data_direction dir)

{

}

static inline int dma_get_sgtable_attrs(struct device *dev,

		struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr,

		size_t size, unsigned long attrs)

{

	return -ENXIO;

}

static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,

		void *cpu_addr, dma_addr_t dma_addr, size_t size,

		unsigned long attrs)

{

	return -ENXIO;

}

static inline int dma_supported(struct device *dev, u64 mask)

{

	return 0;

}

static inline int dma_set_mask(struct device *dev, u64 mask)

{

	return -EIO;

}

static inline int dma_set_coherent_mask(struct device *dev, u64 mask)

{

	return -EIO;

}

static inline u64 dma_get_required_mask(struct device *dev)

{

	return 0;

}

#endif /* CONFIG_HAS_DMA */



static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,

		size_t size, enum dma_data_direction dir, unsigned long attrs)

{
@@ -470,15 +577,28 @@ static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr, 
	return dma_unmap_page_attrs(dev, addr, size, dir, attrs);

}



static inline void dma_sync_single_range_for_cpu(struct device *dev,

		dma_addr_t addr, unsigned long offset, size_t size,

		enum dma_data_direction dir)

{

	return dma_sync_single_for_cpu(dev, addr + offset, size, dir);

}



static inline void dma_sync_single_range_for_device(struct device *dev,

		dma_addr_t addr, unsigned long offset, size_t size,

		enum dma_data_direction dir)

{

	return dma_sync_single_for_device(dev, addr + offset, size, dir);

}



#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)

#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)

#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)

#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)

#define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)

#define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)



void dma_cache_sync(struct device *dev, void *vaddr, size_t size,

		enum dma_data_direction dir);

#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)

#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)



extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,

		void *cpu_addr, dma_addr_t dma_addr, size_t size,
@@ -498,25 +618,10 @@ bool dma_in_atomic_pool(void *start, size_t size); 
void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags);

bool dma_free_from_pool(void *start, size_t size);



int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,

		void *cpu_addr, dma_addr_t dma_addr, size_t size,

		unsigned long attrs);

#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)



int

dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr,

		dma_addr_t dma_addr, size_t size, unsigned long attrs);



int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,

		void *cpu_addr, dma_addr_t dma_addr, size_t size,

		unsigned long attrs);

#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)



void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,

		gfp_t flag, unsigned long attrs);

void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,

		dma_addr_t dma_handle, unsigned long attrs);



static inline void *dma_alloc_coherent(struct device *dev, size_t size,

		dma_addr_t *dma_handle, gfp_t gfp)

{
@@ -531,18 +636,6 @@ static inline void dma_free_coherent(struct device *dev, size_t size, 
	return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);

}



static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)

{

	debug_dma_mapping_error(dev, dma_addr);



	if (dma_addr == DMA_MAPPING_ERROR)

		return -ENOMEM;

	return 0;

}



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);



static inline u64 dma_get_mask(struct device *dev)

{
@@ -575,8 +668,6 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask) 
	return dma_set_mask_and_coherent(dev, mask);

}



extern u64 dma_get_required_mask(struct device *dev);



#ifndef arch_setup_dma_ops

static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,

				      u64 size, const struct iommu_ops *iommu,
@@ -673,24 +764,6 @@ dma_mark_declared_memory_occupied(struct device *dev, 
}

#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */



/*

 * Managed DMA API

 */

#ifdef CONFIG_HAS_DMA

extern void *dmam_alloc_attrs(struct device *dev, size_t size,

				 dma_addr_t *dma_handle, gfp_t gfp,

				 unsigned long attrs);

extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,

			       dma_addr_t dma_handle);

#else /* !CONFIG_HAS_DMA */

static inline void *dmam_alloc_attrs(struct device *dev, size_t size,

					dma_addr_t *dma_handle, gfp_t gfp,

					unsigned long attrs)

{ return NULL; }

static inline void dmam_free_coherent(struct device *dev, size_t size,

				      void *vaddr, dma_addr_t dma_handle) { }

#endif /* !CONFIG_HAS_DMA */



static inline void *dmam_alloc_coherent(struct device *dev, size_t size,

		dma_addr_t *dma_handle, gfp_t gfp)

{