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/linux/drivers/iommu/arm/arm-smmu-v3/ |
H A D | arm-smmu-v3-sva.c | diff 395ad89d11fd93f79a6b942e91fc409807a63c4b Wed May 26 18:19:28 CEST 2021 Jean-Philippe Brucker <jean-philippe@linaro.org> iommu/arm-smmu-v3: Add stall support for platform devices
The SMMU provides a Stall model for handling page faults in platform devices. It is similar to PCIe PRI, but doesn't require devices to have their own translation cache. Instead, faulting transactions are parked and the OS is given a chance to fix the page tables and retry the transaction.
Enable stall for devices that support it (opt-in by firmware). When an event corresponds to a translation error, call the IOMMU fault handler. If the fault is recoverable, it will call us back to terminate or continue the stall.
To use stall device drivers need to enable IOMMU_DEV_FEAT_IOPF, which initializes the fault queue for the device.
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20210526161927.24268-4-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
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H A D | arm-smmu-v3.c | diff 395ad89d11fd93f79a6b942e91fc409807a63c4b Wed May 26 18:19:28 CEST 2021 Jean-Philippe Brucker <jean-philippe@linaro.org> iommu/arm-smmu-v3: Add stall support for platform devices
The SMMU provides a Stall model for handling page faults in platform devices. It is similar to PCIe PRI, but doesn't require devices to have their own translation cache. Instead, faulting transactions are parked and the OS is given a chance to fix the page tables and retry the transaction.
Enable stall for devices that support it (opt-in by firmware). When an event corresponds to a translation error, call the IOMMU fault handler. If the fault is recoverable, it will call us back to terminate or continue the stall.
To use stall device drivers need to enable IOMMU_DEV_FEAT_IOPF, which initializes the fault queue for the device.
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20210526161927.24268-4-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
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