[RFC PATCH 21/21] powerpc/mm/book3s64: Avoid sending IPI on clearing PMD

[Aneesh Kumar K.V]

Now that all the lockless page table walk is careful w.r.t the PTE
address returned, we can now revert
commit: 13bd817bb884 ("powerpc/thp: Serialize pmd clear against a linux page table walk.")

This speeds up Qemu termination with large guest RAM value.

We also drop the equivalent IPI from other pte updates routines. We still keep
IPI in hash pmdp collapse and that is to take care of parallel hash page table
insert. The radix pmdp collapse flush can possibly be removed once I am sure
generic code doesn't have the any expectations around parallel gup walk.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
---
 arch/powerpc/mm/book3s64/hash_pgtable.c  | 11 -----------
 arch/powerpc/mm/book3s64/pgtable.c       |  8 --------
 arch/powerpc/mm/book3s64/radix_pgtable.c | 20 ++++++++------------
 3 files changed, 8 insertions(+), 31 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c
index 64733b9cb20a..64ca375278dc 100644
--- a/arch/powerpc/mm/book3s64/hash_pgtable.c
+++ b/arch/powerpc/mm/book3s64/hash_pgtable.c
@@ -363,17 +363,6 @@ pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
 	 * hash fault look at them.
 	 */
 	memset(pgtable, 0, PTE_FRAG_SIZE);
-	/*
-	 * Serialize against find_current_mm_pte variants which does lock-less
-	 * lookup in page tables with local interrupts disabled. For huge pages
-	 * it casts pmd_t to pte_t. Since format of pte_t is different from
-	 * pmd_t we want to prevent transit from pmd pointing to page table
-	 * to pmd pointing to huge page (and back) while interrupts are disabled.
-	 * We clear pmd to possibly replace it with page table pointer in
-	 * different code paths. So make sure we wait for the parallel
-	 * find_curren_mm_pte to finish.
-	 */
-	serialize_against_pte_lookup(mm);
 	return old_pmd;
 }
 
diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
index 2bf7e1b4fd82..93fc3be41ed9 100644
--- a/arch/powerpc/mm/book3s64/pgtable.c
+++ b/arch/powerpc/mm/book3s64/pgtable.c
@@ -109,14 +109,6 @@ pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 
 	old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID);
 	flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
-	/*
-	 * This ensures that generic code that rely on IRQ disabling
-	 * to prevent a parallel THP split work as expected.
-	 *
-	 * Marking the entry with _PAGE_INVALID && ~_PAGE_PRESENT requires
-	 * a special case check in pmd_access_permitted.
-	 */
-	serialize_against_pte_lookup(vma->vm_mm);
 	return __pmd(old_pmd);
 }
 
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index dd1bea45325c..1ae77568221d 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -957,7 +957,14 @@ 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 */
+	/*
+	 * pmdp collapse_flush need to ensure that there are no parallel gup
+	 * walk after this call. We can ensure that by sending IPI because
+	 * gup walk happens with IRQ disabled.
+	 * FIXME!!
+	 * At this point I am not sure why we have a comment above pmdp_collapse_flush
+	 * that a parallel gup walk should be avoided.
+	 */
 	serialize_against_pte_lookup(vma->vm_mm);
 
 	radix__flush_tlb_collapsed_pmd(vma->vm_mm, address);
@@ -1018,17 +1025,6 @@ pmd_t radix__pmdp_huge_get_and_clear(struct mm_struct *mm,
 
 	old = radix__pmd_hugepage_update(mm, addr, pmdp, ~0UL, 0);
 	old_pmd = __pmd(old);
-	/*
-	 * Serialize against find_current_mm_pte which does lock-less
-	 * lookup in page tables with local interrupts disabled. For huge pages
-	 * it casts pmd_t to pte_t. Since format of pte_t is different from
-	 * pmd_t we want to prevent transit from pmd pointing to page table
-	 * to pmd pointing to huge page (and back) while interrupts are disabled.
-	 * We clear pmd to possibly replace it with page table pointer in
-	 * different code paths. So make sure we wait for the parallel
-	 * find_current_mm_pte to finish.
-	 */
-	serialize_against_pte_lookup(mm);
 	return old_pmd;
 }
 
-- 
2.24.1