swiotlb: add debugfs to track swiotlb transient pool usage

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Introduce a new debugfs interface io_tlb_transient_nslabs. The device
driver can create a new swiotlb transient memory pool once default
memory pool is full. To export the swiotlb transient memory pool usage
via debugfs would help the user estimate the size of transient swiotlb
memory pool or analyze device driver memory leak issue.

Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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ZhangPeng 2024-01-09 15:04:56 +08:00 • committed by Christoph Hellwig

parent cf1182944c

commit 02e7656970

2 changed files with 49 additions and 0 deletions

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3

include/linux/swiotlb.h

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46

kernel/dma/swiotlb.c

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