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Merge tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping

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Pull dma-mapping updates from Christoph Hellwig:

 - move the USB special case that bounced DMA through a device bar into
   the USB code instead of handling it in the common DMA code (Laurentiu
   Tudor and Fredrik Noring)

 - don't dip into the global CMA pool for single page allocations
   (Nicolin Chen)

 - fix a crash when allocating memory for the atomic pool failed during
   boot (Florian Fainelli)

 - move support for MIPS-style uncached segments to the common code and
   use that for MIPS and nios2 (me)

 - make support for DMA_ATTR_NON_CONSISTENT and
   DMA_ATTR_NO_KERNEL_MAPPING generic (me)

 - convert nds32 to the generic remapping allocator (me)

* tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping: (29 commits)
  dma-mapping: mark dma_alloc_need_uncached as __always_inline
  MIPS: only select ARCH_HAS_UNCACHED_SEGMENT for non-coherent platforms
  usb: host: Fix excessive alignment restriction for local memory allocations
  lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators
  nios2: use the generic uncached segment support in dma-direct
  nds32: use the generic remapping allocator for coherent DMA allocations
  arc: use the generic remapping allocator for coherent DMA allocations
  dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code
  dma-direct: handle DMA_ATTR_NON_CONSISTENT in common code
  dma-mapping: add a dma_alloc_need_uncached helper
  openrisc: remove the partial DMA_ATTR_NON_CONSISTENT support
  arc: remove the partial DMA_ATTR_NON_CONSISTENT support
  arm-nommu: remove the partial DMA_ATTR_NON_CONSISTENT support
  ARM: dma-mapping: allow larger DMA mask than supported
  dma-mapping: truncate dma masks to what dma_addr_t can hold
  iommu/dma: Apply dma_{alloc,free}_contiguous functions
  dma-remap: Avoid de-referencing NULL atomic_pool
  MIPS: use the generic uncached segment support in dma-direct
  dma-direct: provide generic support for uncached kernel segments
  au1100fb: fix DMA API abuse
  ...
This commit is contained in:
Linus Torvalds
2019-07-12 15:13:55 -07:00
parent 9787aed57d 15ffe5e1ac
commit 9e3a25dc99
41 changed files with 519 additions and 658 deletions
Download Patch File Download Diff File Expand all files Collapse all files

125
lib/genalloc.c
View File

@@ -327,21 +327,45 @@ EXPORT_SYMBOL(gen_pool_alloc_algo_owner);
* gen_pool_dma_alloc - allocate special memory from the pool for DMA usage
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
* @dma: dma-view physical address return value. Use NULL if unneeded.
* @dma: dma-view physical address return value. Use %NULL if unneeded.
*
* Allocate the requested number of bytes from the specified pool.
* Uses the pool allocation function (with first-fit algorithm by default).
* Can not be used in NMI handler on architectures without
* NMI-safe cmpxchg implementation.
*
* Return: virtual address of the allocated memory, or %NULL on failure
*/
void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
{
return gen_pool_dma_alloc_algo(pool, size, dma, pool->algo, pool->data);
}
EXPORT_SYMBOL(gen_pool_dma_alloc);
/**
* gen_pool_dma_alloc_algo - allocate special memory from the pool for DMA
* usage with the given pool algorithm
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
* @dma: DMA-view physical address return value. Use %NULL if unneeded.
* @algo: algorithm passed from caller
* @data: data passed to algorithm
*
* Allocate the requested number of bytes from the specified pool. Uses the
* given pool allocation function. Can not be used in NMI handler on
* architectures without NMI-safe cmpxchg implementation.
*
* Return: virtual address of the allocated memory, or %NULL on failure
*/
void *gen_pool_dma_alloc_algo(struct gen_pool *pool, size_t size,
dma_addr_t *dma, genpool_algo_t algo, void *data)
{
unsigned long vaddr;
if (!pool)
return NULL;
vaddr = gen_pool_alloc(pool, size);
vaddr = gen_pool_alloc_algo(pool, size, algo, data);
if (!vaddr)
return NULL;
@@ -350,7 +374,102 @@ void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
return (void *)vaddr;
}
EXPORT_SYMBOL(gen_pool_dma_alloc);
EXPORT_SYMBOL(gen_pool_dma_alloc_algo);
/**
* gen_pool_dma_alloc_align - allocate special memory from the pool for DMA
* usage with the given alignment
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
* @dma: DMA-view physical address return value. Use %NULL if unneeded.
* @align: alignment in bytes for starting address
*
* Allocate the requested number bytes from the specified pool, with the given
* alignment restriction. Can not be used in NMI handler on architectures
* without NMI-safe cmpxchg implementation.
*
* Return: virtual address of the allocated memory, or %NULL on failure
*/
void *gen_pool_dma_alloc_align(struct gen_pool *pool, size_t size,
dma_addr_t *dma, int align)
{
struct genpool_data_align data = { .align = align };
return gen_pool_dma_alloc_algo(pool, size, dma,
gen_pool_first_fit_align, &data);
}
EXPORT_SYMBOL(gen_pool_dma_alloc_align);
/**
* gen_pool_dma_zalloc - allocate special zeroed memory from the pool for
* DMA usage
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
* @dma: dma-view physical address return value. Use %NULL if unneeded.
*
* Allocate the requested number of zeroed bytes from the specified pool.
* Uses the pool allocation function (with first-fit algorithm by default).
* Can not be used in NMI handler on architectures without
* NMI-safe cmpxchg implementation.
*
* Return: virtual address of the allocated zeroed memory, or %NULL on failure
*/
void *gen_pool_dma_zalloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
{
return gen_pool_dma_zalloc_algo(pool, size, dma, pool->algo, pool->data);
}
EXPORT_SYMBOL(gen_pool_dma_zalloc);
/**
* gen_pool_dma_zalloc_algo - allocate special zeroed memory from the pool for
* DMA usage with the given pool algorithm
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
* @dma: DMA-view physical address return value. Use %NULL if unneeded.
* @algo: algorithm passed from caller
* @data: data passed to algorithm
*
* Allocate the requested number of zeroed bytes from the specified pool. Uses
* the given pool allocation function. Can not be used in NMI handler on
* architectures without NMI-safe cmpxchg implementation.
*
* Return: virtual address of the allocated zeroed memory, or %NULL on failure
*/
void *gen_pool_dma_zalloc_algo(struct gen_pool *pool, size_t size,
dma_addr_t *dma, genpool_algo_t algo, void *data)
{
void *vaddr = gen_pool_dma_alloc_algo(pool, size, dma, algo, data);
if (vaddr)
memset(vaddr, 0, size);
return vaddr;
}
EXPORT_SYMBOL(gen_pool_dma_zalloc_algo);
/**
* gen_pool_dma_zalloc_align - allocate special zeroed memory from the pool for
* DMA usage with the given alignment
* @pool: pool to allocate from
* @size: number of bytes to allocate from the pool
* @dma: DMA-view physical address return value. Use %NULL if unneeded.
* @align: alignment in bytes for starting address
*
* Allocate the requested number of zeroed bytes from the specified pool,
* with the given alignment restriction. Can not be used in NMI handler on
* architectures without NMI-safe cmpxchg implementation.
*
* Return: virtual address of the allocated zeroed memory, or %NULL on failure
*/
void *gen_pool_dma_zalloc_align(struct gen_pool *pool, size_t size,
dma_addr_t *dma, int align)
{
struct genpool_data_align data = { .align = align };
return gen_pool_dma_zalloc_algo(pool, size, dma,
gen_pool_first_fit_align, &data);
}
EXPORT_SYMBOL(gen_pool_dma_zalloc_align);
/**
* gen_pool_free - free allocated special memory back to the pool