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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-05-19 05:49:28 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-05-26 22:22:23 +1000 |
| commit | 2b279c0348af62f42be346c1ea6d70bac98df0f9 (patch) | |
| tree | f1c654ed71a103770420b1d024a9743561877607 | |
| parent | powerpc/8xx: Implement dedicated kasan_init_region() (diff) | |
| download | linux-dev-2b279c0348af62f42be346c1ea6d70bac98df0f9.tar.xz linux-dev-2b279c0348af62f42be346c1ea6d70bac98df0f9.zip | |
powerpc/32s: Allow mapping with BATs with DEBUG_PAGEALLOC
DEBUG_PAGEALLOC only manages RW data.
Text and RO data can still be mapped with BATs.
In order to map with BATs, also enforce data alignment. Set
by default to 256M which is a good compromise for keeping
enough BATs for also KASAN and IMMR.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/fd29c1718ee44d82115d0e835ced808eb4ccbf51.1589866984.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s32/mmu.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/init_32.c | 5 |
3 files changed, 9 insertions, 3 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index fcb0a9ae9872..752deddc9ed9 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -797,6 +797,7 @@ config DATA_SHIFT range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32 range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 + default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32 default 23 if STRICT_KERNEL_RWX && PPC_8xx default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA default 19 if DEBUG_PAGEALLOC && PPC_8xx diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c index a9b2cbc74797..a6dcc708eee3 100644 --- a/arch/powerpc/mm/book3s32/mmu.c +++ b/arch/powerpc/mm/book3s32/mmu.c @@ -170,6 +170,12 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) pr_debug("RAM mapped without BATs\n"); return base; } + if (debug_pagealloc_enabled()) { + if (base >= border) + return base; + if (top >= border) + top = border; + } if (!strict_kernel_rwx_enabled() || base >= border || top <= border) return __mmu_mapin_ram(base, top); diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c index 8977a7c2543d..36c39bd37256 100644 --- a/arch/powerpc/mm/init_32.c +++ b/arch/powerpc/mm/init_32.c @@ -99,10 +99,9 @@ static void __init MMU_setup(void) if (IS_ENABLED(CONFIG_PPC_8xx)) return; - if (debug_pagealloc_enabled()) { - __map_without_bats = 1; + if (debug_pagealloc_enabled()) __map_without_ltlbs = 1; - } + if (strict_kernel_rwx_enabled()) __map_without_ltlbs = 1; } |