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9f78e446bd
This patch makes iommu/amd call report_iommu_fault() when an I/O page fault occurs, which has two effects: 1) It allows device drivers to register a callback to be notified of I/O page faults, via the iommu_set_fault_handler() API. 2) It triggers the io_page_fault tracepoint in report_iommu_fault() when an I/O page fault occurs. The latter point is the main aim of this patch, as it allows rasdaemon-like daemons to be notified of I/O page faults, and to possibly initiate corrective action in response. A number of other IOMMU drivers already use report_iommu_fault(), and I/O page faults on those IOMMUs therefore already trigger this tracepoint -- but this isn't yet the case for AMD-Vi and Intel DMAR. The AMD IOMMU specification suggests that the bit in an I/O page fault event log entry that signals whether an I/O page fault was for a read request or for a write request is only meaningful when the faulting access was to a present page, but some testing on a Ryzen 3700X suggests that this bit encodes the correct value even for I/O page faults to non-present pages, and therefore, this patch passes the R/W information up the stack even for I/O page faults to non-present pages. Signed-off-by: Lennert Buytenhek <buytenh@arista.com> Link: https://lore.kernel.org/r/YVLyBW97vZLpOaAp@wantstofly.org Signed-off-by: Joerg Roedel <jroedel@suse.de> |
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| .. | ||
| amd | ||
| arm | ||
| intel | ||
| apple-dart.c | ||
| dma-iommu.c | ||
| exynos-iommu.c | ||
| fsl_pamu_domain.c | ||
| fsl_pamu_domain.h | ||
| fsl_pamu.c | ||
| fsl_pamu.h | ||
| hyperv-iommu.c | ||
| io-pgfault.c | ||
| io-pgtable-arm-v7s.c | ||
| io-pgtable-arm.c | ||
| io-pgtable-arm.h | ||
| io-pgtable.c | ||
| ioasid.c | ||
| iommu-debugfs.c | ||
| iommu-sva-lib.c | ||
| iommu-sva-lib.h | ||
| iommu-sysfs.c | ||
| iommu-traces.c | ||
| iommu.c | ||
| iova.c | ||
| ipmmu-vmsa.c | ||
| irq_remapping.c | ||
| irq_remapping.h | ||
| Kconfig | ||
| Makefile | ||
| msm_iommu_hw-8xxx.h | ||
| msm_iommu.c | ||
| msm_iommu.h | ||
| mtk_iommu_v1.c | ||
| mtk_iommu.c | ||
| mtk_iommu.h | ||
| of_iommu.c | ||
| omap-iommu-debug.c | ||
| omap-iommu.c | ||
| omap-iommu.h | ||
| omap-iopgtable.h | ||
| rockchip-iommu.c | ||
| s390-iommu.c | ||
| sprd-iommu.c | ||
| sun50i-iommu.c | ||
| tegra-gart.c | ||
| tegra-smmu.c | ||
| virtio-iommu.c | ||