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dma-mapping: refactor dma_{alloc,free}_pages 

Factour out internal versions without the dma_debug calls in preparation
for callers that will need different dma_debug calls.

Note that this changes the dma_debug calls to get the not page aligned
size values, but as long as alloc and free agree on one variant we are
fine.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Ricardo Ribalda <ribalda@chromium.org>
This commit is contained in:
Christoph Hellwig 2021-02-01 18:12:02 +01:00
parent eedb0b12d0
commit 198c50e2cc
1 changed files with 19 additions and 10 deletions
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29
kernel/dma/mapping.c
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@ -477,11 +477,10 @@ void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
}
EXPORT_SYMBOL(dma_free_attrs);
struct page *dma_alloc_pages(struct device *dev, size_t size,
static struct page *__dma_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
struct page *page;
if (WARN_ON_ONCE(!dev->coherent_dma_mask))
return NULL;
@ -490,31 +489,41 @@ struct page *dma_alloc_pages(struct device *dev, size_t size,
size = PAGE_ALIGN(size);
if (dma_alloc_direct(dev, ops))
page = dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp);
else if (ops->alloc_pages)
page = ops->alloc_pages(dev, size, dma_handle, dir, gfp);
else
return dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp);
if (!ops->alloc_pages)
return NULL;
return ops->alloc_pages(dev, size, dma_handle, dir, gfp);
}
debug_dma_map_page(dev, page, 0, size, dir, *dma_handle);
struct page *dma_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
struct page *page = __dma_alloc_pages(dev, size, dma_handle, dir, gfp);
if (page)
debug_dma_map_page(dev, page, 0, size, dir, *dma_handle);
return page;
}
EXPORT_SYMBOL_GPL(dma_alloc_pages);
void dma_free_pages(struct device *dev, size_t size, struct page *page,
static void __dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
size = PAGE_ALIGN(size);
debug_dma_unmap_page(dev, dma_handle, size, dir);
if (dma_alloc_direct(dev, ops))
dma_direct_free_pages(dev, size, page, dma_handle, dir);
else if (ops->free_pages)
ops->free_pages(dev, size, page, dma_handle, dir);
}
void dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
debug_dma_unmap_page(dev, dma_handle, size, dir);
__dma_free_pages(dev, size, page, dma_handle, dir);
}
EXPORT_SYMBOL_GPL(dma_free_pages);
int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,