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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-05-19 05:49:26 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-26 22:22:23 +1000 |
| commit | fcdafd10a363cf3278ce29c6c9a92930380c6cd8 (patch) | |
| tree | 09bd40daaf027069f0fc1ee5202bd22dd81865aa /arch/powerpc/mm/nohash/8xx.c | |
| parent | da1adea07576722da4597b0df7d00931f0203229 (diff) | |
| download | linux-fcdafd10a363cf3278ce29c6c9a92930380c6cd8.tar.gz linux-fcdafd10a363cf3278ce29c6c9a92930380c6cd8.tar.bz2 linux-fcdafd10a363cf3278ce29c6c9a92930380c6cd8.zip | |
powerpc/8xx: Allow large TLBs with DEBUG_PAGEALLOC
DEBUG_PAGEALLOC only manages RW data.
Text and RO data can still be mapped with hugepages and pinned TLB.
In order to map with hugepages, also enforce a 512kB data alignment
minimum. That's a trade-off between size of speed, taking into
account that DEBUG_PAGEALLOC is a debug option. Anyway the alignment
is still tunable.
We also allow tuning of alignment for book3s to limit the complexity
of the test in Kconfig that will anyway disappear in the following
patches once DEBUG_PAGEALLOC is handled together with BATs.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c13256f2d356a316715da61fe089b3623ef217a5.1589866984.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm/nohash/8xx.c')
| -rw-r--r-- | arch/powerpc/mm/nohash/8xx.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c index d8697f535c3e..286441bbbe49 100644 --- a/arch/powerpc/mm/nohash/8xx.c +++ b/arch/powerpc/mm/nohash/8xx.c @@ -150,7 +150,8 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) { unsigned long etext8 = ALIGN(__pa(_etext), SZ_8M); unsigned long sinittext = __pa(_sinittext); - unsigned long boundary = strict_kernel_rwx_enabled() ? sinittext : etext8; + bool strict_boundary = strict_kernel_rwx_enabled() || debug_pagealloc_enabled(); + unsigned long boundary = strict_boundary ? sinittext : etext8; unsigned long einittext8 = ALIGN(__pa(_einittext), SZ_8M); WARN_ON(top < einittext8); @@ -161,8 +162,12 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) return 0; mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, true); - mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL_TEXT, true); - mmu_mapin_ram_chunk(einittext8, top, PAGE_KERNEL, true); + if (debug_pagealloc_enabled()) { + top = boundary; + } else { + mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL_TEXT, true); + mmu_mapin_ram_chunk(einittext8, top, PAGE_KERNEL, true); + } if (top > SZ_32M) memblock_set_current_limit(top); |