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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coherent.c	dma-mapping: make the global coherent pool conditional	2021-08-19 09:02:39 +02:00
contiguous.c
debug.c	dma-debug: make things less spammy under memory pressure	2022-06-22 14:21:55 +02:00
debug.h	dma-debug: teach add_dma_entry() about DMA_ATTR_SKIP_CPU_SYNC	2021-10-18 12:46:45 +02:00
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	dma-mapping: return error code from dma_dummy_map_sg()	2021-08-09 17:13:06 +02:00
Kconfig	Merge branch 'stable/for-linus-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb	2021-09-03 10:34:44 -07:00
Makefile	dma-mapping updates for 5.11:	2020-12-22 13:19:43 -08:00
map_benchmark.c	dma-mapping: benchmark: Add support for multi-pages map/unmap	2021-04-02 16:41:08 +02:00
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	dma-mapping: handle vmalloc addresses in dma_common_{mmap,get_sgtable}	2021-07-16 11:30:26 +02:00
pool.c	dma/pool: create dma atomic pool only if dma zone has managed pages	2022-01-27 11:03:00 +01:00
remap.c	kernel/dma: remove unnecessary unmap_kernel_range	2021-04-30 11:20:40 -07:00
swiotlb.c	swiotlb: max mapping size takes min align mask into account	2022-10-05 10:39:40 +02:00