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Date: Fri, 20 May 2022 16:23:19 +0800 From: John Garry <john.garry@...wei.com> To: <damien.lemoal@...nsource.wdc.com>, <joro@...tes.org>, <will@...nel.org>, <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>, <hch@....de>, <m.szyprowski@...sung.com>, <robin.murphy@....com> CC: <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>, <iommu@...ts.linux-foundation.org>, <linux-scsi@...r.kernel.org>, <liyihang6@...ilicon.com>, <chenxiang66@...ilicon.com>, <thunder.leizhen@...wei.com>, John Garry <john.garry@...wei.com> Subject: [PATCH 0/4] DMA mapping changes for SCSI core As reported in [0], DMA mappings whose size exceeds the IOMMU IOVA caching limit may see a big performance hit. This series introduces a new DMA mapping API, dma_opt_mapping_size(), so that drivers may know this limit when performance is a factor in the mapping. Robin didn't like using dma_max_mapping_size() for this [1]. An alternative to adding the new API would be to add a "hard_limit" arg to dma_max_mapping_size(). This would mean fixing up all current users, but it would be good to do that anyway as not all users require a hard limit. The SCSI core coded is modified to use this limit. I also added a patch for libata-scsi as it does not currently honour the shost max_sectors limit. [0] https://lore.kernel.org/linux-iommu/20210129092120.1482-1-thunder.leizhen@huawei.com/ [1] https://lore.kernel.org/linux-iommu/f5b78c9c-312e-70ab-ecbb-f14623a4b6e3@arm.com/ John Garry (4): dma-mapping: Add dma_opt_mapping_size() dma-iommu: Add iommu_dma_opt_mapping_size() scsi: core: Cap shost max_sectors according to DMA optimum mapping limits libata-scsi: Cap ata_device->max_sectors according to shost->max_sectors Documentation/core-api/dma-api.rst | 9 +++++++++ drivers/ata/libata-scsi.c | 1 + drivers/iommu/dma-iommu.c | 6 ++++++ drivers/iommu/iova.c | 5 +++++ drivers/scsi/hosts.c | 5 +++++ drivers/scsi/scsi_lib.c | 4 ---- include/linux/dma-map-ops.h | 1 + include/linux/dma-mapping.h | 5 +++++ include/linux/iova.h | 2 ++ kernel/dma/mapping.c | 12 ++++++++++++ 10 files changed, 46 insertions(+), 4 deletions(-) -- 2.26.2
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