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iommu: Enhance IOMMU default DMA mode build options

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First, add build options IOMMU_DEFAULT_{LAZY|STRICT}, so that we have the
opportunity to set {lazy|strict} mode as default at build time. Then put
the two config options in an choice, as they are mutually exclusive.

[jpg: Make choice between strict and lazy only (and not passthrough)]

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/1626088340-5838-4-git-send-email-john.garry@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Zhen Lei
2021-07-12 19:12:17 +08:00
committed by Joerg Roedel
parent d8577d2e33
commit 712d8f2058
3 changed files with 43 additions and 2 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
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@@ -2042,9 +2042,10 @@
throughput at the cost of reduced device isolation.
Will fall back to strict mode if not supported by
the relevant IOMMU driver.
1 - Strict mode (default).
1 - Strict mode.
DMA unmap operations invalidate IOMMU hardware TLBs
synchronously.
unset - Use value of CONFIG_IOMMU_DEFAULT_{LAZY,STRICT}.
Note: on x86, the default behaviour depends on the
equivalent driver-specific parameters, but a strict
mode explicitly specified by either method takes