From 424de9c6e3f89399fc11afc1f53f89c5329132da Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Wed, 19 Jul 2017 14:49:06 +1000 Subject: [PATCH] powerpc/mm/radix: Avoid flushing the PWC on every flush_tlb_range We do that because it's used by THP pmd collapsing, so use instead a dedicated flush function. Signed-off-by: Benjamin Herrenschmidt Reviewed-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman --- .../include/asm/book3s/64/tlbflush-radix.h | 1 + arch/powerpc/mm/pgtable-radix.c | 5 ++- arch/powerpc/mm/tlb-radix.c | 43 ++++++++++++++++--- 3 files changed, 43 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h index 7196999cdc82..9b433a624bf3 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h @@ -36,6 +36,7 @@ extern void radix__flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmad #define radix__flush_tlb_page_psize(mm,addr,p) radix__local_flush_tlb_page_psize(mm,addr,p) #endif extern void radix__flush_tlb_pwc(struct mmu_gather *tlb, unsigned long addr); +extern void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr); extern void radix__flush_tlb_lpid_va(unsigned long lpid, unsigned long gpa, unsigned long page_size); extern void radix__flush_tlb_lpid(unsigned long lpid); diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index 5cc50d47ce3f..5d05245208ee 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -804,9 +804,12 @@ pmd_t radix__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long addre */ pmd = *pmdp; pmd_clear(pmdp); + /*FIXME!! Verify whether we need this kick below */ kick_all_cpus_sync(); - flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); + + radix__flush_tlb_collapsed_pmd(vma->vm_mm, address); + return pmd; } diff --git a/arch/powerpc/mm/tlb-radix.c b/arch/powerpc/mm/tlb-radix.c index 28f339cdd836..18151e9ad694 100644 --- a/arch/powerpc/mm/tlb-radix.c +++ b/arch/powerpc/mm/tlb-radix.c @@ -272,11 +272,7 @@ void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start, { struct mm_struct *mm = vma->vm_mm; - /* - * This is currently used when collapsing THPs so we need to - * flush the PWC. We should fix this. - */ - radix__flush_all_mm(mm); + radix__flush_tlb_mm(mm); } EXPORT_SYMBOL(radix__flush_tlb_range); @@ -355,6 +351,43 @@ err_out: preempt_enable(); } +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr) +{ + int local = mm_is_thread_local(mm); + unsigned long ap = mmu_get_ap(mmu_virtual_psize); + unsigned long pid, end; + + + pid = mm ? mm->context.id : 0; + if (unlikely(pid == MMU_NO_CONTEXT)) + goto no_context; + + /* 4k page size, just blow the world */ + if (PAGE_SIZE == 0x1000) { + radix__flush_all_mm(mm); + return; + } + + /* Otherwise first do the PWC */ + if (local) + _tlbiel_pid(pid, RIC_FLUSH_PWC); + else + _tlbie_pid(pid, RIC_FLUSH_PWC); + + /* Then iterate the pages */ + end = addr + HPAGE_PMD_SIZE; + for (; addr < end; addr += PAGE_SIZE) { + if (local) + _tlbiel_va(addr, pid, ap, RIC_FLUSH_TLB); + else + _tlbie_va(addr, pid, ap, RIC_FLUSH_TLB); + } +no_context: + preempt_enable(); +} +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + void radix__flush_tlb_lpid_va(unsigned long lpid, unsigned long gpa, unsigned long page_size) { -- 2.30.2