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dma-mapping: properly stub out the DMA API for !CONFIG_HAS_DMA
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This avoids link failures in drivers using the DMA API, when they
are compiled for user mode Linux with CONFIG_COMPILE_TEST=y.

Fixes: 356da6d ("dma-mapping: bypass indirect calls for dma-direct")
Signed-off-by: Christoph Hellwig <hch@lst.de>
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Christoph Hellwig committed Jan 4, 2019
1 parent 4788ba5 commit ed6ccf1
Showing 1 changed file with 164 additions and 91 deletions.
255 changes: 164 additions & 91 deletions include/linux/dma-mapping.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
Expand Down Expand Up @@ -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)
Expand Down Expand Up @@ -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)
Expand All @@ -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)
Expand Down Expand Up @@ -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)
{
Expand All @@ -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,
Expand All @@ -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)
{
Expand All @@ -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)
{
Expand Down Expand Up @@ -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,
Expand Down Expand Up @@ -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)
{
Expand Down

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