powerpc/mm/book3s64/radix: Use freed_tables instead of need_flush_all

With commit 22a61c3c4f13 ("asm-generic/tlb: Track freeing of
page-table directories in struct mmu_gather") we now track whether we
freed page table in mmu_gather. Use that to decide whether to flush
Page Walk Cache.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191024075801.22434-2-aneesh.kumar@linux.ibm.com

diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h
index d5a4491..f6968c8 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/pgalloc.h
+++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h
@@ -122,11 +122,6 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
                                  unsigned long address)
 {
-       /*
-        * By now all the pud entries should be none entries. So go
-        * ahead and flush the page walk cache
-        */
-       flush_tlb_pgtable(tlb, address);
        pgtable_free_tlb(tlb, pud, PUD_INDEX);
 }
 
@@ -143,11 +138,6 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
                                  unsigned long address)
 {
-       /*
-        * By now all the pud entries should be none entries. So go
-        * ahead and flush the page walk cache
-        */
-       flush_tlb_pgtable(tlb, address);
        return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
 }
 
@@ -166,11 +156,6 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
                                  unsigned long address)
 {
-       /*
-        * By now all the pud entries should be none entries. So go
-        * ahead and flush the page walk cache
-        */
-       flush_tlb_pgtable(tlb, address);
        pgtable_free_tlb(tlb, table, PTE_INDEX);
 }
 

diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush.h b/arch/powerpc/include/asm/book3s/64/tlbflush.h
index 7aa8195..dcb5c38 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/tlbflush.h
+++ b/arch/powerpc/include/asm/book3s/64/tlbflush.h
@@ -147,22 +147,6 @@ static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
                flush_tlb_page(vma, address);
 }
 
-/*
- * flush the page walk cache for the address
- */
-static inline void flush_tlb_pgtable(struct mmu_gather *tlb, unsigned long address)
-{
-       /*
-        * Flush the page table walk cache on freeing a page table. We already
-        * have marked the upper/higher level page table entry none by now.
-        * So it is safe to flush PWC here.
-        */
-       if (!radix_enabled())
-               return;
-
-       radix__flush_tlb_pwc(tlb, address);
-}
-
 extern bool tlbie_capable;
 extern bool tlbie_enabled;
 

diff --git a/arch/powerpc/mm/book3s64/radix_tlb.c b/arch/powerpc/mm/book3s64/radix_tlb.c
index 24d1f30..f9a4d57 100644 (file)
--- a/arch/powerpc/mm/book3s64/radix_tlb.c
+++ b/arch/powerpc/mm/book3s64/radix_tlb.c
@@ -732,18 +732,13 @@ local:
        }
        preempt_enable();
 }
+
 void radix__flush_all_mm(struct mm_struct *mm)
 {
        __flush_all_mm(mm, false);
 }
 EXPORT_SYMBOL(radix__flush_all_mm);
 
-void radix__flush_tlb_pwc(struct mmu_gather *tlb, unsigned long addr)
-{
-       tlb->need_flush_all = 1;
-}
-EXPORT_SYMBOL(radix__flush_tlb_pwc);
-
 void radix__flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
                                 int psize)
 {
@@ -1003,12 +998,12 @@ void radix__tlb_flush(struct mmu_gather *tlb)
        if (tlb->fullmm) {
                __flush_all_mm(mm, true);
        } else if ( (psize = radix_get_mmu_psize(page_size)) == -1) {
-               if (!tlb->need_flush_all)
+               if (!tlb->freed_tables)
                        radix__flush_tlb_mm(mm);
                else
                        radix__flush_all_mm(mm);
        } else {
-               if (!tlb->need_flush_all)
+               if (!tlb->freed_tables)
                        radix__flush_tlb_range_psize(mm, start, end, psize);
                else
                        radix__flush_tlb_pwc_range_psize(mm, start, end, psize);