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dma-direct: remove dma_direct_{alloc,free}_pages 

Just merge these helpers into the main dma_direct_{alloc,free} routines,
as the additional checks are always false for the two callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2020-08-17 17:06:40 +02:00
parent abdaf11ac1
commit 2f5388a29b
4 changed files with 19 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kernel/amd_gart_64.c
View File

@ -467,7 +467,7 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
{
void *vaddr;
vaddr = dma_direct_alloc_pages(dev, size, dma_addr, flag, attrs);
vaddr = dma_direct_alloc(dev, size, dma_addr, flag, attrs);
if (!vaddr ||
!force_iommu || dev->coherent_dma_mask <= DMA_BIT_MASK(24))
return vaddr;
@ -479,7 +479,7 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
goto out_free;
return vaddr;
out_free:
dma_direct_free_pages(dev, size, vaddr, *dma_addr, attrs);
dma_direct_free(dev, size, vaddr, *dma_addr, attrs);
return NULL;
}
@ -489,7 +489,7 @@ gart_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_addr, unsigned long attrs)
{
gart_unmap_page(dev, dma_addr, size, DMA_BIDIRECTIONAL, 0);
dma_direct_free_pages(dev, size, vaddr, dma_addr, attrs);
dma_direct_free(dev, size, vaddr, dma_addr, attrs);
}
static int no_agp;

4
include/linux/dma-direct.h
View File

@ -77,10 +77,6 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs);
void *dma_direct_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs);
int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);

39
kernel/dma/direct.c
View File

@ -151,13 +151,18 @@ again:
return page;
}
void *dma_direct_alloc_pages(struct device *dev, size_t size,
void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
struct page *page;
void *ret;
int err;
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
dma_alloc_need_uncached(dev, attrs))
return arch_dma_alloc(dev, size, dma_handle, gfp, attrs);
size = PAGE_ALIGN(size);
if (dma_should_alloc_from_pool(dev, gfp, attrs)) {
@ -256,11 +261,18 @@ out_free_pages:
return NULL;
}
void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs)
void dma_direct_free(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs)
{
unsigned int page_order = get_order(size);
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
dma_alloc_need_uncached(dev, attrs)) {
arch_dma_free(dev, size, cpu_addr, dma_addr, attrs);
return;
}
/* If cpu_addr is not from an atomic pool, dma_free_from_pool() fails */
if (dma_should_free_from_pool(dev, attrs) &&
dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size)))
@ -284,27 +296,6 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
dma_free_contiguous(dev, dma_direct_to_page(dev, dma_addr), size);
}
void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
dma_alloc_need_uncached(dev, attrs))
return arch_dma_alloc(dev, size, dma_handle, gfp, attrs);
return dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
}
void dma_direct_free(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs)
{
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
dma_alloc_need_uncached(dev, attrs))
arch_dma_free(dev, size, cpu_addr, dma_addr, attrs);
else
dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);
}
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
defined(CONFIG_SWIOTLB)
void dma_direct_sync_sg_for_device(struct device *dev,

2
kernel/dma/pool.c
View File

@ -115,7 +115,7 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
#endif
/*
* Memory in the atomic DMA pools must be unencrypted, the pools do not
* shrink so no re-encryption occurs in dma_direct_free_pages().
* shrink so no re-encryption occurs in dma_direct_free().
*/
ret = set_memory_decrypted((unsigned long)page_to_virt(page),
1 << order);