iommu/virtio: Add ops->flush_iotlb_all and enable deferred flush
Add ops->flush_iotlb_all operation to enable virtio-iommu for the dma-iommu deferred flush scheme. This results in a significant increase in performance in exchange for a window in which devices can still access previously IOMMU mapped memory when running with CONFIG_IOMMU_DEFAULT_DMA_LAZY. The previous strict behavior can be achieved with iommu.strict=1 on the kernel command line or CONFIG_IOMMU_DEFAULT_DMA_STRICT. Link: https://lore.kernel.org/lkml/20230802123612.GA6142@myrica/ Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20231120-viommu-sync-map-v3-2-50a57ecf78b5@linux.ibm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -926,6 +926,19 @@ static int viommu_iotlb_sync_map(struct iommu_domain *domain,
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return viommu_sync_req(vdomain->viommu);
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}
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static void viommu_flush_iotlb_all(struct iommu_domain *domain)
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{
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struct viommu_domain *vdomain = to_viommu_domain(domain);
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/*
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* May be called before the viommu is initialized including
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* while creating direct mapping
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*/
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if (!vdomain->nr_endpoints)
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return;
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viommu_sync_req(vdomain->viommu);
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}
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static void viommu_get_resv_regions(struct device *dev, struct list_head *head)
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{
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struct iommu_resv_region *entry, *new_entry, *msi = NULL;
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@ -1051,6 +1064,8 @@ static bool viommu_capable(struct device *dev, enum iommu_cap cap)
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switch (cap) {
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case IOMMU_CAP_CACHE_COHERENCY:
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return true;
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case IOMMU_CAP_DEFERRED_FLUSH:
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return true;
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default:
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return false;
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}
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@ -1071,6 +1086,7 @@ static struct iommu_ops viommu_ops = {
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.map_pages = viommu_map_pages,
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.unmap_pages = viommu_unmap_pages,
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.iova_to_phys = viommu_iova_to_phys,
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.flush_iotlb_all = viommu_flush_iotlb_all,
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.iotlb_sync = viommu_iotlb_sync,
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.iotlb_sync_map = viommu_iotlb_sync_map,
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.free = viommu_domain_free,
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