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authorJanne Grunau <j@jannau.net>2022-09-16 11:41:49 +0200
committerJoerg Roedel <jroedel@suse.de>2022-09-26 13:48:40 +0200
commit745ef1092bcfcf3bca8d82c260947ca498022dde (patch)
tree31439b0721b0bc291d1c89ef783e66bfd8e8e624 /drivers/iommu/Kconfig
parent7e18e42e4b280c85b76967a9106a13ca61c16179 (diff)
iommu/io-pgtable: Move Apple DART support to its own file
The pte format used by the DARTs found in the Apple M1 (t8103) is not fully compatible with io-pgtable-arm. The 24 MSB are used for subpage protection (mapping only parts of page) and conflict with the address mask. In addition bit 1 is not available for tagging entries but disables subpage protection. Subpage protection could be useful to support a CPU granule of 4k with the fixed IOMMU page size of 16k. The DARTs found on Apple M1 Pro/Max/Ultra use another different pte format which is even less compatible. To support an output address size of 42 bit the address is shifted down by 4. Subpage protection is mandatory and bit 1 signifies uncached mappings used by the display controller. It would be advantageous to share code for all known Apple DART variants to support common features. The page table allocator for DARTs is less complex since it uses a two levels of translation table without support for huge pages. Signed-off-by: Janne Grunau <j@jannau.net> Acked-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Sven Peter <sven@svenpeter.dev> Acked-by: Hector Martin <marcan@marcan.st> Link: https://lore.kernel.org/r/20220916094152.87137-3-j@jannau.net [ joro: Fix compile warning in __dart_alloc_pages()] Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/Kconfig')
-rw-r--r--drivers/iommu/Kconfig13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 5c5cb5bee8b6..82cebeb5529c 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -67,6 +67,17 @@ config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
If unsure, say N here.
+config IOMMU_IO_PGTABLE_DART
+ bool "Apple DART Formats"
+ select IOMMU_IO_PGTABLE
+ depends on ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
+ help
+ Enable support for the Apple DART pagetable formats. These include
+ the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
+ SoCs.
+
+ If unsure, say N here.
+
endmenu
config IOMMU_DEBUGFS
@@ -294,7 +305,7 @@ config APPLE_DART
tristate "Apple DART IOMMU Support"
depends on ARCH_APPLE || (COMPILE_TEST && !GENERIC_ATOMIC64)
select IOMMU_API
- select IOMMU_IO_PGTABLE_LPAE
+ select IOMMU_IO_PGTABLE_DART
default ARCH_APPLE
help
Support for Apple DART (Device Address Resolution Table) IOMMUs