diff options
| author | Nicolin Chen <nicoleotsuka@gmail.com> | 2020-09-02 01:16:45 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-09-03 19:12:15 +0300 |
| commit | 1e9d90dbed120ec98517428ffff4dacd9797e39d (patch) | |
| tree | d743be6b54427bb62e36e6d1ae2f6fc243cd70b7 /arch/sparc/kernel/pci_sun4v.c | |
| parent | 2281f797f5524abb8fff66bf8540b4f4687332a2 (diff) | |
| download | linux-1e9d90dbed120ec98517428ffff4dacd9797e39d.tar.xz | |
dma-mapping: introduce dma_get_seg_boundary_nr_pages()
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>
Diffstat (limited to 'arch/sparc/kernel/pci_sun4v.c')
| -rw-r--r-- | arch/sparc/kernel/pci_sun4v.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c index 14b93c5564e3..6b92dd51c002 100644 --- a/arch/sparc/kernel/pci_sun4v.c +++ b/arch/sparc/kernel/pci_sun4v.c @@ -508,8 +508,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist, iommu_batch_start(dev, prot, ~0UL); max_seg_size = dma_get_max_seg_size(dev); - seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, - IO_PAGE_SIZE) >> IO_PAGE_SHIFT; + seg_boundary_size = dma_get_seg_boundary_nr_pages(dev, IO_PAGE_SHIFT); mask = *dev->dma_mask; if (!iommu_use_atu(iommu, mask)) |