From 3542dcb15cef66c0b9e6c3b33168eb657e0d9520 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Fri, 5 Mar 2021 16:32:34 +0000 Subject: iommu/dma: Resurrect the "forcedac" option In converting intel-iommu over to the common IOMMU DMA ops, it quietly lost the functionality of its "forcedac" option. Since this is a handy thing both for testing and for performance optimisation on certain platforms, reimplement it under the common IOMMU parameter namespace. For the sake of fixing the inadvertent breakage of the Intel-specific parameter, remove the dmar_forcedac remnants and hook it up as an alias while documenting the transition to the new common parameter. Fixes: c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops") Signed-off-by: Robin Murphy Acked-by: Lu Baolu Reviewed-by: John Garry Link: https://lore.kernel.org/r/7eece8e0ea7bfbe2cd0e30789e0d46df573af9b0.1614961776.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel --- include/linux/dma-iommu.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index 706b68d1359b..13d1f4c14d7b 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -40,6 +40,8 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list); void iommu_dma_free_cpu_cached_iovas(unsigned int cpu, struct iommu_domain *domain); +extern bool iommu_dma_forcedac; + #else /* CONFIG_IOMMU_DMA */ struct iommu_domain; -- cgit v1.2.3