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swiotlb: Limit max bounce buffer size

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Limiting to 4096, assuming this is used for virtual io block device. The
default maximum (256kB) would result in overflowing of bounce buffers
and stalling of IO (max_segments of 254 for block device and max
bounce size of 256kB could result in block layer submitting a huge IO
request that can never be finished successfully). With 4096, we have
the max size of request set to 254*4096, which is a reasonable space
to set aside per block device.

Change-Id: I8a3b0ec6d26a1b7f5ccdcee649f02c3556bce93b
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
This commit is contained in:
Srivatsa Vaddagiri 2021-01-07 09:08:14 -08:00 committed by Gerrit - the friendly Code Review server
parent 13a1aaf641
commit 8dbe481c45
1 changed files with 7 additions and 1 deletions
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8
kernel/dma/swiotlb.c
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@ -794,7 +794,12 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
}
#ifdef CONFIG_SWIOTLB_NONLINEAR
EXPORT_SYMBOL(swiotlb_map);
#endif
size_t swiotlb_max_mapping_size(struct device *dev)
{
return 4096;
}
#else
size_t swiotlb_max_mapping_size(struct device *dev)
{
@ -811,6 +816,7 @@ size_t swiotlb_max_mapping_size(struct device *dev)
return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE - min_align;
}
#endif
bool is_swiotlb_active(struct device *dev)
{