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| author |   Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2017-03-22 09:06:59 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2017-04-01 21:12:27 +1100 |
| commit | bb1832217a859f6dbe4a45ff2ba7fdcab0bb3958 (patch) | |
| tree | c69f520be8c0f319fdef84b867eb6ab8944198d8 /arch/powerpc | |
| parent | powerpc/mm: Add addr_limit to mm_context and use it to derive max slice index (diff) | |
| download | linux-dev-bb1832217a859f6dbe4a45ff2ba7fdcab0bb3958.tar.xz linux-dev-bb1832217a859f6dbe4a45ff2ba7fdcab0bb3958.zip | |
powerpc/mm/hash: Store addr_limit in PACA
We optmize the slice page size array copy to paca by copying only the
range based on addr_limit. This will require us to not look at page size
array beyond addr_limit in PACA on slb fault. To enable that copy task
size to paca which will be used during slb fault.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[mpe: Rename from task_size to addr_limit, consolidate #ifdefs]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/paca.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/paca.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/mm/slb_low.S | 8 |
4 files changed, 10 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h index f48c250339fd..65d0ffb2aa33 100644 --- a/arch/powerpc/include/asm/paca.h +++ b/arch/powerpc/include/asm/paca.h @@ -139,6 +139,7 @@ struct paca_struct { #ifdef CONFIG_PPC_MM_SLICES u64 mm_ctx_low_slices_psize; unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE]; + unsigned long addr_limit; #else u16 mm_ctx_user_psize; u16 mm_ctx_sllp; diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 4367e7df51a1..795505e27535 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -185,6 +185,7 @@ int main(void) #ifdef CONFIG_PPC_MM_SLICES OFFSET(PACALOWSLICESPSIZE, paca_struct, mm_ctx_low_slices_psize); OFFSET(PACAHIGHSLICEPSIZE, paca_struct, mm_ctx_high_slices_psize); + DEFINE(PACA_ADDR_LIMIT, offsetof(struct paca_struct, addr_limit)); DEFINE(MMUPSIZEDEFSIZE, sizeof(struct mmu_psize_def)); #endif /* CONFIG_PPC_MM_SLICES */ #endif diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index a2c7a6456ee6..8d63627e067f 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -254,6 +254,7 @@ void copy_mm_to_paca(struct mm_struct *mm) get_paca()->mm_ctx_id = context->id; #ifdef CONFIG_PPC_MM_SLICES VM_BUG_ON(!mm->context.addr_limit); + get_paca()->addr_limit = mm->context.addr_limit; get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize; memcpy(&get_paca()->mm_ctx_high_slices_psize, &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm)); diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S index 1c503d07e0fb..1519617aab36 100644 --- a/arch/powerpc/mm/slb_low.S +++ b/arch/powerpc/mm/slb_low.S @@ -149,7 +149,13 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_1T_SEGMENT) * For userspace addresses, make sure this is region 0. */ cmpdi r9, 0 - bne 8f + bne- 8f + /* + * user space make sure we are within the allowed limit + */ + ld r11,PACA_ADDR_LIMIT(r13) + cmpld r3,r11 + bge- 8f /* when using slices, we extract the psize off the slice bitmaps * and then we need to get the sllp encoding off the mmu_psize_defs |