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dma-mapping: introduce dma_get_seg_boundary_nr_pages()

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We found that callers of dma_get_seg_boundary mostly do an ALIGN
with page mask and then do a page shift to get number of pages:
    ALIGN(boundary + 1, 1 << shift) >> shift

However, the boundary might be as large as ULONG_MAX, which means
that a device has no specific boundary limit. So either "+ 1" or
passing it to ALIGN() would potentially overflow.

According to kernel defines:
    #define ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
    #define ALIGN(x, a)	ALIGN_MASK(x, (typeof(x))(a) - 1)

We can simplify the logic here into a helper function doing:
  ALIGN(boundary + 1, 1 << shift) >> shift
= ALIGN_MASK(b + 1, (1 << s) - 1) >> s
= {[b + 1 + (1 << s) - 1] & ~[(1 << s) - 1]} >> s
= [b + 1 + (1 << s) - 1] >> s
= [b + (1 << s)] >> s
= (b >> s) + 1

This patch introduces and applies dma_get_seg_boundary_nr_pages()
as an overflow-free helper for the dma_get_seg_boundary() callers
to get numbers of pages. It also takes care of the NULL dev case
for non-DMA API callers.

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Niklas Schnelle <schnelle@linux.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Nicolin Chen
2020-09-01 15:16:45 -07:00
committed by Christoph Hellwig
parent 2281f797f5
commit 1e9d90dbed
11 changed files with 33 additions and 38 deletions
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19
include/linux/dma-mapping.h
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@@ -632,6 +632,25 @@ static inline unsigned long dma_get_seg_boundary(struct device *dev)
return DMA_BIT_MASK(32);
}
/**
* dma_get_seg_boundary_nr_pages - return the segment boundary in "page" units
* @dev: device to guery the boundary for
* @page_shift: ilog() of the IOMMU page size
*
* Return the segment boundary in IOMMU page units (which may be different from
* the CPU page size) for the passed in device.
*
* If @dev is NULL a boundary of U32_MAX is assumed, this case is just for
* non-DMA API callers.
*/
static inline unsigned long dma_get_seg_boundary_nr_pages(struct device *dev,
unsigned int page_shift)
{
if (!dev)
return (U32_MAX >> page_shift) + 1;
return (dma_get_seg_boundary(dev) >> page_shift) + 1;
}
static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
{
if (dev->dma_parms) {