Merge tag 'dma-mapping-5.20-2022-08-06' of git://git.infradead.org/users/hch/dma...

Pull dma-mapping updates from Christoph Hellwig:

 - convert arm32 to the common dma-direct code (Arnd Bergmann, Robin
   Murphy, Christoph Hellwig)

 - restructure the PCIe peer to peer mapping support (Logan Gunthorpe)

 - allow the IOMMU code to communicate an optional DMA mapping length
   and use that in scsi and libata (John Garry)

 - split the global swiotlb lock (Tianyu Lan)

 - various fixes and cleanup (Chao Gao, Dan Carpenter, Dongli Zhang,
   Lukas Bulwahn, Robin Murphy)

* tag 'dma-mapping-5.20-2022-08-06' of git://git.infradead.org/users/hch/dma-mapping: (45 commits)
  swiotlb: fix passing local variable to debugfs_create_ulong()
  dma-mapping: reformat comment to suppress htmldoc warning
  PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg()
  RDMA/rw: drop pci_p2pdma_[un]map_sg()
  RDMA/core: introduce ib_dma_pci_p2p_dma_supported()
  nvme-pci: convert to using dma_map_sgtable()
  nvme-pci: check DMA ops when indicating support for PCI P2PDMA
  iommu/dma: support PCI P2PDMA pages in dma-iommu map_sg
  iommu: Explicitly skip bus address marked segments in __iommu_map_sg()
  dma-mapping: add flags to dma_map_ops to indicate PCI P2PDMA support
  dma-direct: support PCI P2PDMA pages in dma-direct map_sg
  dma-mapping: allow EREMOTEIO return code for P2PDMA transfers
  PCI/P2PDMA: Introduce helpers for dma_map_sg implementations
  PCI/P2PDMA: Attempt to set map_type if it has not been set
  lib/scatterlist: add flag for indicating P2PDMA segments in an SGL
  swiotlb: clean up some coding style and minor issues
  dma-mapping: update comment after dmabounce removal
  scsi: sd: Add a comment about limiting max_sectors to shost optimal limit
  ata: libata-scsi: cap ata_device->max_sectors according to shost->max_sectors
  scsi: scsi_transport_sas: cap shost opt_sectors according to DMA optimal limit
  ...

diff --cc Documentation/admin-guide/kernel-parameters.txt
Simple merge

diff --cc arch/arm/Kconfig
Simple merge

diff --cc arch/arm/mach-footbridge/Kconfig
Simple merge

diff --cc arch/arm/mach-mvebu/coherency.c
Simple merge

diff --cc arch/arm/mm/dma-mapping.c
Simple merge

diff --cc drivers/ata/libata-scsi.c
Simple merge

diff --cc drivers/iommu/dma-iommu.c
Simple merge

diff --cc drivers/iommu/iommu.c
Simple merge

diff --cc drivers/iommu/iova.c
Simple merge

diff --cc drivers/nvme/host/core.c
Simple merge

diff --cc drivers/nvme/host/nvme.h
index bdc0ff7,544b4ec..1bdf714
--- 1/drivers/nvme/host/nvme.h
--- 2/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@@ -511,9 -501,9 +510,10 @@@ struct nvme_ctrl_ops 
        void (*free_ctrl)(struct nvme_ctrl *ctrl);
        void (*submit_async_event)(struct nvme_ctrl *ctrl);
        void (*delete_ctrl)(struct nvme_ctrl *ctrl);
 +      void (*stop_ctrl)(struct nvme_ctrl *ctrl);
        int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
        void (*print_device_info)(struct nvme_ctrl *ctrl);
+       bool (*supports_pci_p2pdma)(struct nvme_ctrl *ctrl);
  };
  
  /*

diff --cc drivers/nvme/host/pci.c
Simple merge

diff --cc drivers/scsi/hosts.c
Simple merge

diff --cc drivers/scsi/scsi_lib.c
Simple merge

diff --cc drivers/scsi/sd.c
Simple merge

diff --cc drivers/usb/core/hcd.c
Simple merge

diff --cc include/rdma/ib_verbs.h
Simple merge

diff --cc include/scsi/scsi_host.h
Simple merge

diff --cc kernel/dma/direct.c
Simple merge