powerpc: add support for folded p4d page tables

Implement primitives necessary for the 4th level folding, add walks of p4d
level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h.

[[email protected]: powerpc/xmon: drop unused pgdir varialble in show_pte() function]
  Link: http://lkml.kernel.org/r/[email protected]
[[email protected]; build fix]
  Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Rapoport <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Tested-by: Christophe Leroy <[email protected]> # 8xx and 83xx
Cc: Arnd Bergmann <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Brian Cain <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Guan Xuetao <[email protected]>
Cc: James Morse <[email protected]>
Cc: Jonas Bonn <[email protected]>
Cc: Julien Thierry <[email protected]>
Cc: Ley Foon Tan <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Russell King <[email protected]>
Cc: Stafford Horne <[email protected]>
Cc: Stefan Kristiansson <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

1 files changed, 19 insertions, 11 deletions

diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index e3759b69f81b..c2499271f6c1 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -265,6 +265,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
 {
 	pgd_t *pgd;
+	p4d_t *p4d;
 	pud_t *pud;
 	pmd_t *pmd;
 
@@ -272,7 +273,9 @@ void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
 		return;
 	pgd = mm->pgd + pgd_index(addr);
 	BUG_ON(pgd_none(*pgd));
-	pud = pud_offset(pgd, addr);
+	p4d = p4d_offset(pgd, addr);
+	BUG_ON(p4d_none(*p4d));
+	pud = pud_offset(p4d, addr);
 	BUG_ON(pud_none(*pud));
 	pmd = pmd_offset(pud, addr);
 	/*
@@ -312,12 +315,13 @@ EXPORT_SYMBOL_GPL(vmalloc_to_phys);
 pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
 			bool *is_thp, unsigned *hpage_shift)
 {
-	pgd_t pgd, *pgdp;
+	pgd_t *pgdp;
+	p4d_t p4d, *p4dp;
 	pud_t pud, *pudp;
 	pmd_t pmd, *pmdp;
 	pte_t *ret_pte;
 	hugepd_t *hpdp = NULL;
-	unsigned pdshift = PGDIR_SHIFT;
+	unsigned pdshift;
 
 	if (hpage_shift)
 		*hpage_shift = 0;
@@ -325,24 +329,28 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
 	if (is_thp)
 		*is_thp = false;
 
-	pgdp = pgdir + pgd_index(ea);
-	pgd  = READ_ONCE(*pgdp);
 	/*
 	 * Always operate on the local stack value. This make sure the
 	 * value don't get updated by a parallel THP split/collapse,
 	 * page fault or a page unmap. The return pte_t * is still not
 	 * stable. So should be checked there for above conditions.
+	 * Top level is an exception because it is folded into p4d.
 	 */
-	if (pgd_none(pgd))
+	pgdp = pgdir + pgd_index(ea);
+	p4dp = p4d_offset(pgdp, ea);
+	p4d  = READ_ONCE(*p4dp);
+	pdshift = P4D_SHIFT;
+
+	if (p4d_none(p4d))
 		return NULL;
 
-	if (pgd_is_leaf(pgd)) {
-		ret_pte = (pte_t *)pgdp;
+	if (p4d_is_leaf(p4d)) {
+		ret_pte = (pte_t *)p4dp;
 		goto out;
 	}
 
-	if (is_hugepd(__hugepd(pgd_val(pgd)))) {
-		hpdp = (hugepd_t *)&pgd;
+	if (is_hugepd(__hugepd(p4d_val(p4d)))) {
+		hpdp = (hugepd_t *)&p4d;
 		goto out_huge;
 	}
 
@@ -352,7 +360,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
 	 * irq disabled
 	 */
 	pdshift = PUD_SHIFT;
-	pudp = pud_offset(&pgd, ea);
+	pudp = pud_offset(&p4d, ea);
 	pud  = READ_ONCE(*pudp);
 
 	if (pud_none(pud))