Tianyu Lan 625899cd06 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 10:38:40 +02:00
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coherent.c
contiguous.c
debug.c	dma-debug: make things less spammy under memory pressure	2022-06-22 14:13:13 +02:00
debug.h
direct.c	dma-direct: don't over-decrypt memory	2022-06-22 14:13:20 +02:00
direct.h	dma-direct: avoid redundant memory sync for swiotlb	2022-04-20 09:23:30 +02:00
dummy.c
Kconfig
Makefile
mapping.c
ops_helpers.c	dma-mapping: handle vmalloc addresses in dma_common_{mmap,get_sgtable}	2021-07-28 14:35:38 +02:00
pool.c	dma/pool: create dma atomic pool only if dma zone has managed pages	2022-01-27 10:53:44 +01:00
remap.c
swiotlb.c	swiotlb: max mapping size takes min align mask into account	2022-10-05 10:38:40 +02:00
virt.c