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iommu: Tidy up io-pgtable dependencies

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Some io-pgtable implementations, and thus their users too, carry a
slightly odd dependency to get around the GENERIC_ATOMIC64 version of
cmpxchg64() often failing to compile. Since this is a functional
dependency, it's a bit misleading and untidy to tie it explicitly to
COMPILE_TEST while assuming that it's also implied by the other
platform/architecture options. Make things clearer by separating these
functional dependencies into distinct statements from those controlling
visibility, and since they do look a bit non-obvious to the uninitiated,
also commenting them for good measure.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/51d8c78e2ecc6696ac5907526580209ea6da167f.1673553587.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2023-01-12 19:59:47 +00:00 committed by Joerg Roedel
parent 8f9930fa01
commit d286a58bc8
1 changed files with 12 additions and 6 deletions
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18
drivers/iommu/Kconfig
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@ -32,7 +32,8 @@ config IOMMU_IO_PGTABLE
config IOMMU_IO_PGTABLE_LPAE
bool "ARMv7/v8 Long Descriptor Format"
select IOMMU_IO_PGTABLE
depends on ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
depends on ARM || ARM64 || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for cpmxchg64()
help
Enable support for the ARM long descriptor pagetable format.
This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
@ -70,7 +71,8 @@ config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
config IOMMU_IO_PGTABLE_DART
bool "Apple DART Formats"
select IOMMU_IO_PGTABLE
depends on ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
depends on ARM64 || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for cpmxchg64()
help
Enable support for the Apple DART pagetable formats. These include
the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
@ -284,7 +286,8 @@ config EXYNOS_IOMMU_DEBUG
config IPMMU_VMSA
bool "Renesas VMSA-compatible IPMMU"
depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
depends on ARCH_RENESAS || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU
@ -304,7 +307,8 @@ config SPAPR_TCE_IOMMU
config APPLE_DART
tristate "Apple DART IOMMU Support"
depends on ARCH_APPLE || (COMPILE_TEST && !GENERIC_ATOMIC64)
depends on ARCH_APPLE || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART
select IOMMU_API
select IOMMU_IO_PGTABLE_DART
default ARCH_APPLE
@ -319,7 +323,8 @@ config APPLE_DART
# ARM IOMMU support
config ARM_SMMU
tristate "ARM Ltd. System MMU (SMMU) Support"
depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)
depends on ARM64 || ARM || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU if ARM
@ -466,7 +471,8 @@ config MTK_IOMMU_V1
config QCOM_IOMMU
# Note: iommu drivers cannot (yet?) be built as modules
bool "Qualcomm IOMMU Support"
depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
depends on ARCH_QCOM || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
select QCOM_SCM
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE