Hi, This series is spun out and expanded from my work to add P2PDMA support to DMA map operations[1]. The P2PDMA work requires distinguishing different error conditions in a map_sg operation. dma_map_sgtable() already allows for returning an error code (where as dma_map_sg() is only allowed to return zero) however, it currently only returns -EINVAL when a .map_sg() call returns zero. This series cleans up all .map_sg() implementations to return appropriate error codes. After the cleanup, dma_map_sg() will still return zero, however dma_map_sgtable() will pass the error code from the .map_sg() call. Thanks go to Martn Oliveira for doing a lot of the cleanup of the obscure implementations. The patch set is based off of v5.14-rc1 and a git repo can be found here: https://github.com/sbates130272/linux-p2pmem map_sg_err_cleanup_v1 Thanks, Logan [1] https://lore.kernel.org/linux-block/20210513223203.5542-1-logang@xxxxxxxxxxxx/ -- Logan Gunthorpe (5): dma-mapping: Allow map_sg() ops to return negative error codes dma-direct: Return appropriate error code from dma_direct_map_sg() iommu: Return full error code from iommu_map_sg[_atomic]() dma-iommu: Return error code from iommu_dma_map_sg() dma-mapping: Disallow .map_sg operations from returning zero on error Martin Oliveira (11): alpha: return error code from alpha_pci_map_sg() ARM/dma-mapping: return error code from .map_sg() ops ia64/sba_iommu: return error code from sba_map_sg_attrs() MIPS/jazzdma: return error code from jazz_dma_map_sg() powerpc/iommu: return error code from .map_sg() ops s390/pci: return error code from s390_dma_map_sg() sparc/iommu: return error codes from .map_sg() ops parisc: return error code from .map_sg() ops xen: swiotlb: return error code from xen_swiotlb_map_sg() x86/amd_gart: return error code from gart_map_sg() dma-mapping: return error code from dma_dummy_map_sg() arch/alpha/kernel/pci_iommu.c | 10 +++- arch/arm/mm/dma-mapping.c | 22 +++++--- arch/ia64/hp/common/sba_iommu.c | 9 +-- arch/mips/jazz/jazzdma.c | 2 +- arch/powerpc/kernel/iommu.c | 4 +- arch/powerpc/platforms/ps3/system-bus.c | 2 +- arch/powerpc/platforms/pseries/vio.c | 5 +- arch/s390/pci/pci_dma.c | 12 ++-- arch/sparc/kernel/iommu.c | 4 +- arch/sparc/kernel/pci_sun4v.c | 4 +- arch/sparc/mm/iommu.c | 2 +- arch/x86/kernel/amd_gart_64.c | 16 +++--- drivers/iommu/dma-iommu.c | 20 ++++--- drivers/iommu/iommu.c | 15 +++-- drivers/parisc/ccio-dma.c | 2 +- drivers/parisc/sba_iommu.c | 2 +- drivers/xen/swiotlb-xen.c | 2 +- include/linux/dma-map-ops.h | 6 +- include/linux/dma-mapping.h | 35 +++--------- include/linux/iommu.h | 22 ++++---- kernel/dma/direct.c | 2 +- kernel/dma/dummy.c | 2 +- kernel/dma/mapping.c | 73 ++++++++++++++++++++++--- 23 files changed, 165 insertions(+), 108 deletions(-) base-commit: e73f0f0ee7541171d89f2e2491130c7771ba58d3 -- 2.20.1
