summaryrefslogtreecommitdiff
path: root/include/linux/iommu.h
diff options
context:
space:
mode:
authorRobin Murphy <robin.murphy@arm.com>2022-04-25 13:42:03 +0100
committerJoerg Roedel <jroedel@suse.de>2022-04-28 10:30:25 +0200
commitd0be55fbeb6ac694d15af5d1aad19cdec8cd64e5 (patch)
tree24b64d583945f54de090dc464a7e8ac23a23ce1b /include/linux/iommu.h
parented36d04e8f8d7b00db451b0fa56a54e8e02ec43e (diff)
iommu: Add capability for pre-boot DMA protection
VT-d's dmar_platform_optin() actually represents a combination of properties fairly well standardised by Microsoft as "Pre-boot DMA Protection" and "Kernel DMA Protection"[1]. As such, we can provide interested consumers with an abstracted capability rather than driver-specific interfaces that won't scale. We name it for the former aspect since that's what external callers are most likely to be interested in; the latter is for the IOMMU layer to handle itself. [1] https://docs.microsoft.com/en-us/windows-hardware/design/device-experiences/oem-kernel-dma-protection Suggested-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/d6218dff2702472da80db6aec2c9589010684551.1650878781.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
-rw-r--r--include/linux/iommu.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index e26cf84e5d82..4123693ae319 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -107,6 +107,8 @@ enum iommu_cap {
transactions */
IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */
IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */
+ IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for
+ DMA protection and we should too */
};
/* These are the possible reserved region types */