diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2021-12-01 17:41:51 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-12-09 14:40:24 +0300 |
| commit | c28573744b74eb6de19add503d6a986795c4c137 (patch) | |
| tree | a0e01828ce7e0e92ed571d5c0ed3ca471756c47b /arch/powerpc/platforms/Kconfig.cputype | |
| parent | debeda017189e40bff23d1c3d2e4567ca8541aed (diff) | |
| download | linux-c28573744b74eb6de19add503d6a986795c4c137.tar.xz | |
powerpc/64s: Make hash MMU support configurable
This adds Kconfig selection which allows 64s hash MMU support to be
disabled. It can be disabled if radix support is enabled, the minimum
supported CPU type is POWER9 (or higher), and KVM is not selected.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211201144153.2456614-17-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/platforms/Kconfig.cputype')
| -rw-r--r-- | arch/powerpc/platforms/Kconfig.cputype | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index a208997ade88..7ca07df1c374 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -105,9 +105,9 @@ config PPC_BOOK3S_64 select HAVE_MOVE_PMD select HAVE_MOVE_PUD select IRQ_WORK - select PPC_MM_SLICES select PPC_HAVE_KUEP select PPC_HAVE_KUAP + select PPC_64S_HASH_MMU if !PPC_RADIX_MMU config PPC_BOOK3E_64 bool "Embedded processors" @@ -130,11 +130,13 @@ choice config GENERIC_CPU bool "Generic (POWER4 and above)" depends on PPC64 && !CPU_LITTLE_ENDIAN + select PPC_64S_HASH_MMU if PPC_BOOK3S_64 config GENERIC_CPU bool "Generic (POWER8 and above)" depends on PPC64 && CPU_LITTLE_ENDIAN select ARCH_HAS_FAST_MULTIPLIER + select PPC_64S_HASH_MMU config GENERIC_CPU bool "Generic 32 bits powerpc" @@ -143,24 +145,29 @@ config GENERIC_CPU config CELL_CPU bool "Cell Broadband Engine" depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN + select PPC_64S_HASH_MMU config POWER5_CPU bool "POWER5" depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN + select PPC_64S_HASH_MMU config POWER6_CPU bool "POWER6" depends on PPC_BOOK3S_64 && !CPU_LITTLE_ENDIAN + select PPC_64S_HASH_MMU config POWER7_CPU bool "POWER7" depends on PPC_BOOK3S_64 select ARCH_HAS_FAST_MULTIPLIER + select PPC_64S_HASH_MMU config POWER8_CPU bool "POWER8" depends on PPC_BOOK3S_64 select ARCH_HAS_FAST_MULTIPLIER + select PPC_64S_HASH_MMU config POWER9_CPU bool "POWER9" @@ -364,6 +371,22 @@ config SPE If in doubt, say Y here. +config PPC_64S_HASH_MMU + bool "Hash MMU Support" + depends on PPC_BOOK3S_64 + select PPC_MM_SLICES + default y + help + Enable support for the Power ISA Hash style MMU. This is implemented + by all IBM Power and other 64-bit Book3S CPUs before ISA v3.0. The + OpenPOWER ISA does not mandate the hash MMU and some CPUs do not + implement it (e.g., Microwatt). + + Note that POWER9 PowerVM platforms only support the hash + MMU. From POWER10 radix is also supported by PowerVM. + + If you're unsure, say Y. + config PPC_RADIX_MMU bool "Radix MMU Support" depends on PPC_BOOK3S_64 @@ -375,7 +398,8 @@ config PPC_RADIX_MMU you can probably disable this. config PPC_RADIX_MMU_DEFAULT - bool "Default to using the Radix MMU when possible" + bool "Default to using the Radix MMU when possible" if PPC_64S_HASH_MMU + depends on PPC_BOOK3S_64 depends on PPC_RADIX_MMU default y help |