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| author | Robin Murphy <robin.murphy@arm.com> | 2021-03-05 16:32:34 +0000 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-03-18 10:55:23 +0100 |
| commit | 3542dcb15cef66c0b9e6c3b33168eb657e0d9520 (patch) | |
| tree | e8484ba2f056cd6ee5b1d042af44834136cb97cb /include/linux/dma-iommu.h | |
| parent | b9abb19fa5fd2d8a4be61c6cd4b2a48aa1a17f9c (diff) | |
| download | lwn-3542dcb15cef66c0b9e6c3b33168eb657e0d9520.tar.gz lwn-3542dcb15cef66c0b9e6c3b33168eb657e0d9520.zip | |
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 <robin.murphy@arm.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/7eece8e0ea7bfbe2cd0e30789e0d46df573af9b0.1614961776.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/dma-iommu.h')
| -rw-r--r-- | include/linux/dma-iommu.h | 2 |
1 files changed, 2 insertions, 0 deletions
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; |