Tianyu Lan bfe5dc2101 swiotlb: max mapping size takes min align mask into account ... commit 82806744fd upstream. swiotlb_find_slots() skips slots according to io tlb aligned mask calculated from min aligned mask and original physical address offset. This affects max mapping size. The mapping size can't achieve the IO_TLB_SEGSIZE * IO_TLB_SIZE when original offset is non-zero. This will cause system boot up failure in Hyper-V Isolation VM where swiotlb force is enabled. Scsi layer use return value of dma_max_mapping_size() to set max segment size and it finally calls swiotlb_max_mapping_size(). Hyper-V storage driver sets min align mask to 4k - 1. Scsi layer may pass 256k length of request buffer with 0~4k offset and Hyper-V storage driver can't get swiotlb bounce buffer via DMA API. Swiotlb_find_slots() can't find 256k length bounce buffer with offset. Make swiotlb_max_mapping _size() take min align mask into account. Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Rishabh Bhatnagar <risbhat@amazon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-10-05 10:39:40 +02:00
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Kconfig	…
Makefile	…
coherent.c	…
contiguous.c	…
debug.c	dma-debug: make things less spammy under memory pressure	2022-06-22 14:21:55 +02:00
debug.h	…
direct.c	dma-direct: use the correct size for dma_set_encrypted()	2022-06-29 09:03:31 +02:00
direct.h	dma-direct: avoid redundant memory sync for swiotlb	2022-04-20 09:34:21 +02:00
dummy.c	…
map_benchmark.c	…
mapping.c	dma-mapping: remove bogus test for pfn_valid from dma_map_resource	2022-04-27 14:38:50 +02:00
ops_helpers.c	…
pool.c	…
remap.c	…
swiotlb.c	swiotlb: max mapping size takes min align mask into account	2022-10-05 10:39:40 +02:00