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iommu: Update "iommu.strict" documentation 

Consolidating the flush queue logic also meant that the "iommu.strict"
option started taking effect on x86 as well. Make sure we document that.

Fixes: a250c23f15 ("iommu: remove DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/2c8c06e1b449d6b060c5bf9ad3b403cd142f405d.1623682646.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2021-06-14 15:57:26 +01:00 committed by Joerg Roedel
parent e86b041ffe
commit 531353e650
1 changed files with 5 additions and 1 deletions
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6
Documentation/admin-guide/kernel-parameters.txt
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@ -1987,7 +1987,7 @@
forcing Dual Address Cycle for PCI cards supporting
greater than 32-bit addressing.
iommu.strict= [ARM64] Configure TLB invalidation behaviour
iommu.strict= [ARM64, X86] Configure TLB invalidation behaviour
Format: { "0" | "1" }
0 - Lazy mode.
Request that DMA unmap operations use deferred
@ -1998,6 +1998,10 @@
1 - Strict mode (default).
DMA unmap operations invalidate IOMMU hardware TLBs
synchronously.
Note: on x86, the default behaviour depends on the
equivalent driver-specific parameters, but a strict
mode explicitly specified by either method takes
precedence.
iommu.passthrough=
[ARM64, X86] Configure DMA to bypass the IOMMU by default.