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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>
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4 changed files with 10 additions and 1 deletions
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@ -139,6 +139,7 @@ struct paca_struct {
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#ifdef CONFIG_PPC_MM_SLICES
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u64 mm_ctx_low_slices_psize;
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unsigned char mm_ctx_high_slices_psize[SLICE_ARRAY_SIZE];
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unsigned long addr_limit;
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#else
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u16 mm_ctx_user_psize;
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u16 mm_ctx_sllp;
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@ -185,6 +185,7 @@ int main(void)
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#ifdef CONFIG_PPC_MM_SLICES
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OFFSET(PACALOWSLICESPSIZE, paca_struct, mm_ctx_low_slices_psize);
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OFFSET(PACAHIGHSLICEPSIZE, paca_struct, mm_ctx_high_slices_psize);
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DEFINE(PACA_ADDR_LIMIT, offsetof(struct paca_struct, addr_limit));
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DEFINE(MMUPSIZEDEFSIZE, sizeof(struct mmu_psize_def));
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#endif /* CONFIG_PPC_MM_SLICES */
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#endif
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@ -254,6 +254,7 @@ void copy_mm_to_paca(struct mm_struct *mm)
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get_paca()->mm_ctx_id = context->id;
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#ifdef CONFIG_PPC_MM_SLICES
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VM_BUG_ON(!mm->context.addr_limit);
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get_paca()->addr_limit = mm->context.addr_limit;
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get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize;
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memcpy(&get_paca()->mm_ctx_high_slices_psize,
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&context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm));
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@ -149,7 +149,13 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_1T_SEGMENT)
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* For userspace addresses, make sure this is region 0.
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*/
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cmpdi r9, 0
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bne 8f
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bne- 8f
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/*
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* user space make sure we are within the allowed limit
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*/
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ld r11,PACA_ADDR_LIMIT(r13)
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cmpld r3,r11
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bge- 8f
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/* when using slices, we extract the psize off the slice bitmaps
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* and then we need to get the sllp encoding off the mmu_psize_defs
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