[PATCH] powerpc: add support for folded p4d page tables

From: Mike Rapoport
Date: Mon Dec 09 2019 - 10:09:19 EST

From: Mike Rapoport <rppt@xxxxxxxxxxxxx>

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

Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
---
arch/powerpc/include/asm/book3s/32/pgtable.h | 1 -
arch/powerpc/include/asm/book3s/64/hash.h | 4 +-
arch/powerpc/include/asm/book3s/64/pgalloc.h | 4 +-
arch/powerpc/include/asm/book3s/64/pgtable.h | 58 ++++++++++--------
arch/powerpc/include/asm/book3s/64/radix.h | 6 +-
arch/powerpc/include/asm/nohash/32/pgtable.h | 1 -
arch/powerpc/include/asm/nohash/64/pgalloc.h | 2 +-
.../include/asm/nohash/64/pgtable-4k.h | 32 +++++-----
arch/powerpc/include/asm/nohash/64/pgtable.h | 6 +-
arch/powerpc/include/asm/pgtable.h | 8 +++
arch/powerpc/kvm/book3s_64_mmu_radix.c | 59 ++++++++++++++++---
arch/powerpc/lib/code-patching.c | 7 ++-
arch/powerpc/mm/book3s32/mmu.c | 2 +-
arch/powerpc/mm/book3s32/tlb.c | 4 +-
arch/powerpc/mm/book3s64/hash_pgtable.c | 4 +-
arch/powerpc/mm/book3s64/radix_pgtable.c | 19 ++++--
arch/powerpc/mm/book3s64/subpage_prot.c | 6 +-
arch/powerpc/mm/hugetlbpage.c | 28 +++++----
arch/powerpc/mm/kasan/kasan_init_32.c | 8 +--
arch/powerpc/mm/mem.c | 4 +-
arch/powerpc/mm/nohash/40x.c | 4 +-
arch/powerpc/mm/nohash/book3e_pgtable.c | 15 +++--
arch/powerpc/mm/pgtable.c | 25 +++++++-
arch/powerpc/mm/pgtable_32.c | 28 +++++----
arch/powerpc/mm/pgtable_64.c | 10 ++--
arch/powerpc/mm/ptdump/hashpagetable.c | 20 ++++++-
arch/powerpc/mm/ptdump/ptdump.c | 22 ++++++-
arch/powerpc/xmon/xmon.c | 17 +++++-
28 files changed, 284 insertions(+), 120 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h
index 0796533d37dd..e23de69bbaf8 100644
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/32/pgtable.h
@@ -2,7 +2,6 @@
#ifndef _ASM_POWERPC_BOOK3S_32_PGTABLE_H
#define _ASM_POWERPC_BOOK3S_32_PGTABLE_H

-#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>

#include <asm/book3s/32/hash.h>
diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 2781ebf6add4..876d1528c2cf 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -134,9 +134,9 @@ static inline int get_region_id(unsigned long ea)

#define hash__pmd_bad(pmd) (pmd_val(pmd) & H_PMD_BAD_BITS)
#define hash__pud_bad(pud) (pud_val(pud) & H_PUD_BAD_BITS)
-static inline int hash__pgd_bad(pgd_t pgd)
+static inline int hash__p4d_bad(p4d_t p4d)
{
- return (pgd_val(pgd) == 0);
+ return (p4d_val(p4d) == 0);
}
#ifdef CONFIG_STRICT_KERNEL_RWX
extern void hash__mark_rodata_ro(void);
diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h
index f6968c811026..08603089ea5f 100644
--- a/arch/powerpc/include/asm/book3s/64/pgalloc.h
+++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h
@@ -87,9 +87,9 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
}

-static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
+static inline void p4d_populate(struct mm_struct *mm, p4d_t *pgd, pud_t *pud)
{
- *pgd = __pgd(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
+ *pgd = __p4d(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index b01624e5c467..96fc48a42f4d 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -2,7 +2,7 @@
#ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_
#define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_

-#include <asm-generic/5level-fixup.h>
+#include <asm-generic/pgtable-nop4d.h>

#ifndef __ASSEMBLY__
#include <linux/mmdebug.h>
@@ -251,7 +251,7 @@ extern unsigned long __pmd_frag_size_shift;
/* Bits to mask out from a PUD to get to the PMD page */
#define PUD_MASKED_BITS 0xc0000000000000ffUL
/* Bits to mask out from a PGD to get to the PUD page */
-#define PGD_MASKED_BITS 0xc0000000000000ffUL
+#define P4D_MASKED_BITS 0xc0000000000000ffUL

/*
* Used as an indicator for rcu callback functions
@@ -949,54 +949,60 @@ static inline bool pud_access_permitted(pud_t pud, bool write)
return pte_access_permitted(pud_pte(pud), write);
}

-#define pgd_write(pgd) pte_write(pgd_pte(pgd))
+#define __p4d_raw(x) ((p4d_t) { __pgd_raw(x) })
+static inline __be64 p4d_raw(p4d_t x)
+{
+ return pgd_raw(x.pgd);
+}
+
+#define p4d_write(p4d) pte_write(p4d_pte(p4d))

-static inline void pgd_clear(pgd_t *pgdp)
+static inline void p4d_clear(p4d_t *p4dp)
{
- *pgdp = __pgd(0);
+ *p4dp = __p4d(0);
}

-static inline int pgd_none(pgd_t pgd)
+static inline int p4d_none(p4d_t p4d)
{
- return !pgd_raw(pgd);
+ return !p4d_raw(p4d);
}

-static inline int pgd_present(pgd_t pgd)
+static inline int p4d_present(p4d_t p4d)
{
- return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT));
+ return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PRESENT));
}

-static inline pte_t pgd_pte(pgd_t pgd)
+static inline pte_t p4d_pte(p4d_t p4d)
{
- return __pte_raw(pgd_raw(pgd));
+ return __pte_raw(p4d_raw(p4d));
}

-static inline pgd_t pte_pgd(pte_t pte)
+static inline p4d_t pte_p4d(pte_t pte)
{
- return __pgd_raw(pte_raw(pte));
+ return __p4d_raw(pte_raw(pte));
}

-static inline int pgd_bad(pgd_t pgd)
+static inline int p4d_bad(p4d_t p4d)
{
if (radix_enabled())
- return radix__pgd_bad(pgd);
- return hash__pgd_bad(pgd);
+ return radix__p4d_bad(p4d);
+ return hash__p4d_bad(p4d);
}

-#define pgd_access_permitted pgd_access_permitted
-static inline bool pgd_access_permitted(pgd_t pgd, bool write)
+#define p4d_access_permitted p4d_access_permitted
+static inline bool p4d_access_permitted(p4d_t p4d, bool write)
{
- return pte_access_permitted(pgd_pte(pgd), write);
+ return pte_access_permitted(p4d_pte(p4d), write);
}

-extern struct page *pgd_page(pgd_t pgd);
+extern struct page *p4d_page(p4d_t p4d);

/* Pointers in the page table tree are physical addresses */
#define __pgtable_ptr_val(ptr) __pa(ptr)

#define pmd_page_vaddr(pmd) __va(pmd_val(pmd) & ~PMD_MASKED_BITS)
#define pud_page_vaddr(pud) __va(pud_val(pud) & ~PUD_MASKED_BITS)
-#define pgd_page_vaddr(pgd) __va(pgd_val(pgd) & ~PGD_MASKED_BITS)
+#define p4d_page_vaddr(p4d) __va(p4d_val(p4d) & ~P4D_MASKED_BITS)

#define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
#define pud_index(address) (((address) >> (PUD_SHIFT)) & (PTRS_PER_PUD - 1))
@@ -1010,8 +1016,8 @@ extern struct page *pgd_page(pgd_t pgd);

#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))

-#define pud_offset(pgdp, addr) \
- (((pud_t *) pgd_page_vaddr(*(pgdp))) + pud_index(addr))
+#define pud_offset(p4dp, addr) \
+ (((pud_t *) p4d_page_vaddr(*(p4dp))) + pud_index(addr))
#define pmd_offset(pudp,addr) \
(((pmd_t *) pud_page_vaddr(*(pudp))) + pmd_index(addr))
#define pte_offset_kernel(dir,addr) \
@@ -1366,6 +1372,12 @@ static inline bool pud_is_leaf(pud_t pud)
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
}

+#define p4d_is_leaf p4d_is_leaf
+static inline bool p4d_is_leaf(p4d_t p4d)
+{
+ return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PTE));
+}
+
#define pgd_is_leaf pgd_is_leaf
static inline bool pgd_is_leaf(pgd_t pgd)
{
diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index d97db3ad9aae..9bca2ac64220 100644
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -30,7 +30,7 @@
/* Don't have anything in the reserved bits and leaf bits */
#define RADIX_PMD_BAD_BITS 0x60000000000000e0UL
#define RADIX_PUD_BAD_BITS 0x60000000000000e0UL
-#define RADIX_PGD_BAD_BITS 0x60000000000000e0UL
+#define RADIX_P4D_BAD_BITS 0x60000000000000e0UL

#define RADIX_PMD_SHIFT (PAGE_SHIFT + RADIX_PTE_INDEX_SIZE)
#define RADIX_PUD_SHIFT (RADIX_PMD_SHIFT + RADIX_PMD_INDEX_SIZE)
@@ -227,9 +227,9 @@ static inline int radix__pud_bad(pud_t pud)
}


-static inline int radix__pgd_bad(pgd_t pgd)
+static inline int radix__p4d_bad(p4d_t p4d)
{
- return !!(pgd_val(pgd) & RADIX_PGD_BAD_BITS);
+ return !!(p4d_val(p4d) & RADIX_P4D_BAD_BITS);
}

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h
index 552b96eef0c8..a0edcc7b0700 100644
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/32/pgtable.h
@@ -2,7 +2,6 @@
#ifndef _ASM_POWERPC_NOHASH_32_PGTABLE_H
#define _ASM_POWERPC_NOHASH_32_PGTABLE_H

-#define __ARCH_USE_5LEVEL_HACK
#include <asm-generic/pgtable-nopmd.h>

#ifndef __ASSEMBLY__
diff --git a/arch/powerpc/include/asm/nohash/64/pgalloc.h b/arch/powerpc/include/asm/nohash/64/pgalloc.h
index b9534a793293..668aee6017e7 100644
--- a/arch/powerpc/include/asm/nohash/64/pgalloc.h
+++ b/arch/powerpc/include/asm/nohash/64/pgalloc.h
@@ -15,7 +15,7 @@ struct vmemmap_backing {
};
extern struct vmemmap_backing *vmemmap_list;

-#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, (unsigned long)PUD)
+#define p4d_populate(MM, P4D, PUD) p4d_set(P4D, (unsigned long)PUD)

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
index c40ec32b8194..81b1c54e3cf1 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
@@ -2,7 +2,7 @@
#ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H
#define _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H

-#include <asm-generic/5level-fixup.h>
+#include <asm-generic/pgtable-nop4d.h>

/*
* Entries per page directory level. The PTE level must use a 64b record
@@ -45,41 +45,41 @@
#define PMD_MASKED_BITS 0
/* Bits to mask out from a PUD to get to the PMD page */
#define PUD_MASKED_BITS 0
-/* Bits to mask out from a PGD to get to the PUD page */
-#define PGD_MASKED_BITS 0
+/* Bits to mask out from a P4D to get to the PUD page */
+#define P4D_MASKED_BITS 0


/*
* 4-level page tables related bits
*/

-#define pgd_none(pgd) (!pgd_val(pgd))
-#define pgd_bad(pgd) (pgd_val(pgd) == 0)
-#define pgd_present(pgd) (pgd_val(pgd) != 0)
-#define pgd_page_vaddr(pgd) (pgd_val(pgd) & ~PGD_MASKED_BITS)
+#define p4d_none(p4d) (!p4d_val(p4d))
+#define p4d_bad(p4d) (p4d_val(p4d) == 0)
+#define p4d_present(p4d) (p4d_val(p4d) != 0)
+#define p4d_page_vaddr(p4d) (p4d_val(p4d) & ~P4D_MASKED_BITS)

#ifndef __ASSEMBLY__

-static inline void pgd_clear(pgd_t *pgdp)
+static inline void p4d_clear(p4d_t *p4dp)
{
- *pgdp = __pgd(0);
+ *p4dp = __p4d(0);
}

-static inline pte_t pgd_pte(pgd_t pgd)
+static inline pte_t p4d_pte(p4d_t p4d)
{
- return __pte(pgd_val(pgd));
+ return __pte(p4d_val(p4d));
}

-static inline pgd_t pte_pgd(pte_t pte)
+static inline p4d_t pte_p4d(pte_t pte)
{
- return __pgd(pte_val(pte));
+ return __p4d(pte_val(pte));
}
-extern struct page *pgd_page(pgd_t pgd);
+extern struct page *p4d_page(p4d_t p4d);

#endif /* !__ASSEMBLY__ */

-#define pud_offset(pgdp, addr) \
- (((pud_t *) pgd_page_vaddr(*(pgdp))) + \
+#define pud_offset(p4dp, addr) \
+ (((pud_t *) p4d_page_vaddr(*(p4dp))) + \
(((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))

#define pud_ERROR(e) \
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index 9a33b8bd842d..b360f262b9c6 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -175,11 +175,11 @@ static inline pud_t pte_pud(pte_t pte)
return __pud(pte_val(pte));
}
#define pud_write(pud) pte_write(pud_pte(pud))
-#define pgd_write(pgd) pte_write(pgd_pte(pgd))
+#define p4d_write(pgd) pte_write(p4d_pte(p4d))

-static inline void pgd_set(pgd_t *pgdp, unsigned long val)
+static inline void p4d_set(p4d_t *p4dp, unsigned long val)
{
- *pgdp = __pgd(val);
+ *p4dp = __p4d(val);
}

/*
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 0e4ec8cc37b7..f831b4d866c3 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -145,6 +145,14 @@ static inline bool pud_is_leaf(pud_t pud)
}
#endif

+#ifndef p4d_is_leaf
+#define p4d_is_leaf p4d_is_leaf
+static inline bool p4d_is_leaf(p4d_t p4d)
+{
+ return false;
+}
+#endif
+
#ifndef pgd_is_leaf
#define pgd_is_leaf pgd_is_leaf
static inline bool pgd_is_leaf(pgd_t pgd)
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index da857c8ba6e4..28e166cbd963 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -496,17 +496,39 @@ static void kvmppc_unmap_free_pud(struct kvm *kvm, pud_t *pud,
pud_free(kvm->mm, pud);
}

+static void kvmppc_unmap_free_p4d(struct kvm *kvm, p4d_t *p4d,
+ unsigned int lpid)
+{
+ unsigned long iu;
+ p4d_t *p = p4d;
+
+ for (iu = 0; iu < PTRS_PER_P4D; ++iu, ++p) {
+ if (!p4d_present(*p))
+ continue;
+ if (p4d_is_leaf(*p)) {
+ p4d_clear(p);
+ } else {
+ pud_t *pud;
+
+ pud = pud_offset(p, 0);
+ kvmppc_unmap_free_pud(kvm, pud, lpid);
+ p4d_clear(p);
+ }
+ }
+ p4d_free(kvm->mm, p4d);
+}
+
void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd, unsigned int lpid)
{
unsigned long ig;

for (ig = 0; ig < PTRS_PER_PGD; ++ig, ++pgd) {
- pud_t *pud;
+ p4d_t *p4d;

if (!pgd_present(*pgd))
continue;
- pud = pud_offset(pgd, 0);
- kvmppc_unmap_free_pud(kvm, pud, lpid);
+ p4d = p4d_offset(pgd, 0);
+ kvmppc_unmap_free_p4d(kvm, p4d, lpid);
pgd_clear(pgd);
}
}
@@ -568,6 +590,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
unsigned long *rmapp, struct rmap_nested **n_rmap)
{
pgd_t *pgd;
+ p4d_t *p4d, *new_p4d = NULL;
pud_t *pud, *new_pud = NULL;
pmd_t *pmd, *new_pmd = NULL;
pte_t *ptep, *new_ptep = NULL;
@@ -575,9 +598,15 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,

/* Traverse the guest's 2nd-level tree, allocate new levels needed */
pgd = pgtable + pgd_index(gpa);
- pud = NULL;
+ p4d = NULL;
if (pgd_present(*pgd))
- pud = pud_offset(pgd, gpa);
+ p4d = p4d_offset(pgd, gpa);
+ else
+ new_p4d = p4d_alloc_one(kvm->mm, gpa);
+
+ pud = NULL;
+ if (p4d_present(*p4d))
+ pud = pud_offset(p4d, gpa);
else
new_pud = pud_alloc_one(kvm->mm, gpa);

@@ -599,12 +628,18 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte,
/* Now traverse again under the lock and change the tree */
ret = -ENOMEM;
if (pgd_none(*pgd)) {
+ if (!new_p4d)
+ goto out_unlock;
+ pgd_populate(kvm->mm, pgd, new_p4d);
+ new_p4d = NULL;
+ }
+ if (p4d_none(*p4d)) {
if (!new_pud)
goto out_unlock;
- pgd_populate(kvm->mm, pgd, new_pud);
+ p4d_populate(kvm->mm, p4d, new_pud);
new_pud = NULL;
}
- pud = pud_offset(pgd, gpa);
+ pud = pud_offset(p4d, gpa);
if (pud_is_leaf(*pud)) {
unsigned long hgpa = gpa & PUD_MASK;

@@ -1222,6 +1257,7 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf,
pgd_t *pgt;
struct kvm_nested_guest *nested;
pgd_t pgd, *pgdp;
+ p4d_t p4d, *p4dp;
pud_t pud, *pudp;
pmd_t pmd, *pmdp;
pte_t *ptep;
@@ -1300,7 +1336,14 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf,
continue;
}

- pudp = pud_offset(&pgd, gpa);
+ p4dp = p4d_offset(&pgd, gpa);
+ p4d = READ_ONCE(*p4dp);
+ if (!(p4d_val(p4d) & _PAGE_PRESENT)) {
+ gpa = (gpa & P4D_MASK) + P4D_SIZE;
+ continue;
+ }
+
+ pudp = pud_offset(&p4d, gpa);
pud = READ_ONCE(*pudp);
if (!(pud_val(pud) & _PAGE_PRESENT)) {
gpa = (gpa & PUD_MASK) + PUD_SIZE;
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index 3345f039a876..7a59f6863cec 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -107,13 +107,18 @@ static inline int unmap_patch_area(unsigned long addr)
pte_t *ptep;
pmd_t *pmdp;
pud_t *pudp;
+ p4d_t *p4dp;
pgd_t *pgdp;

pgdp = pgd_offset_k(addr);
if (unlikely(!pgdp))
return -EINVAL;

- pudp = pud_offset(pgdp, addr);
+ p4dp = p4d_offset(pgdp, addr);
+ if (unlikely(!p4dp))
+ return -EINVAL;
+
+ pudp = pud_offset(p4dp, addr);
if (unlikely(!pudp))
return -EINVAL;

diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c
index 69b2419accef..7479960dc434 100644
--- a/arch/powerpc/mm/book3s32/mmu.c
+++ b/arch/powerpc/mm/book3s32/mmu.c
@@ -312,7 +312,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea)

if (!Hash)
return;
- pmd = pmd_offset(pud_offset(pgd_offset(mm, ea), ea), ea);
+ pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, ea), ea), ea), ea);
if (!pmd_none(*pmd))
add_hash_page(mm->context.id, ea, pmd_val(*pmd));
}
diff --git a/arch/powerpc/mm/book3s32/tlb.c b/arch/powerpc/mm/book3s32/tlb.c
index 2fcd321040ff..175bc33b41b7 100644
--- a/arch/powerpc/mm/book3s32/tlb.c
+++ b/arch/powerpc/mm/book3s32/tlb.c
@@ -87,7 +87,7 @@ static void flush_range(struct mm_struct *mm, unsigned long start,
if (start >= end)
return;
end = (end - 1) | ~PAGE_MASK;
- pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start);
+ pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, start), start), start), start);
for (;;) {
pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1;
if (pmd_end > end)
@@ -145,7 +145,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
return;
}
mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm;
- pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr);
+ pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr), vmaddr);
if (!pmd_none(*pmd))
flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1);
}
diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c
index 64733b9cb20a..9cd15937e88a 100644
--- a/arch/powerpc/mm/book3s64/hash_pgtable.c
+++ b/arch/powerpc/mm/book3s64/hash_pgtable.c
@@ -148,6 +148,7 @@ void hash__vmemmap_remove_mapping(unsigned long start,
int hash__map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
{
pgd_t *pgdp;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@@ -155,7 +156,8 @@ int hash__map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
BUILD_BUG_ON(TASK_SIZE_USER64 > H_PGTABLE_RANGE);
if (slab_is_available()) {
pgdp = pgd_offset_k(ea);
- pudp = pud_alloc(&init_mm, pgdp, ea);
+ p4dp = p4d_offset(pgdp, ea);
+ pudp = pud_alloc(&init_mm, p4dp, ea);
if (!pudp)
return -ENOMEM;
pmdp = pmd_alloc(&init_mm, pudp, ea);
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 974109bb85db..c02427eab084 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -64,17 +64,24 @@ static int early_map_kernel_page(unsigned long ea, unsigned long pa,
{
unsigned long pfn = pa >> PAGE_SHIFT;
pgd_t *pgdp;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;

pgdp = pgd_offset_k(ea);
if (pgd_none(*pgdp)) {
+ p4dp = early_alloc_pgtable(PGD_TABLE_SIZE, nid,
+ region_start, region_end);
+ pgd_populate(&init_mm, pgdp, p4dp);
+ }
+ p4dp = p4d_offset(pgdp, ea);
+ if (p4d_none(*p4dp)) {
pudp = early_alloc_pgtable(PUD_TABLE_SIZE, nid,
region_start, region_end);
- pgd_populate(&init_mm, pgdp, pudp);
+ p4d_populate(&init_mm, p4dp, pudp);
}
- pudp = pud_offset(pgdp, ea);
+ pudp = pud_offset(p4dp, ea);
if (map_page_size == PUD_SIZE) {
ptep = (pte_t *)pudp;
goto set_the_pte;
@@ -114,6 +121,7 @@ static int __map_kernel_page(unsigned long ea, unsigned long pa,
{
unsigned long pfn = pa >> PAGE_SHIFT;
pgd_t *pgdp;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@@ -136,7 +144,8 @@ static int __map_kernel_page(unsigned long ea, unsigned long pa,
* boot.
*/
pgdp = pgd_offset_k(ea);
- pudp = pud_alloc(&init_mm, pgdp, ea);
+ p4dp = p4d_offset(pgdp, ea);
+ pudp = pud_alloc(&init_mm, p4dp, ea);
if (!pudp)
return -ENOMEM;
if (map_page_size == PUD_SIZE) {
@@ -173,6 +182,7 @@ void radix__change_memory_range(unsigned long start, unsigned long end,
{
unsigned long idx;
pgd_t *pgdp;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@@ -185,7 +195,8 @@ void radix__change_memory_range(unsigned long start, unsigned long end,

for (idx = start; idx < end; idx += PAGE_SIZE) {
pgdp = pgd_offset_k(idx);
- pudp = pud_alloc(&init_mm, pgdp, idx);
+ p4dp = p4d_offset(pgdp, idx);
+ pudp = pud_alloc(&init_mm, p4dp, idx);
if (!pudp)
continue;
if (pud_is_leaf(*pudp)) {
diff --git a/arch/powerpc/mm/book3s64/subpage_prot.c b/arch/powerpc/mm/book3s64/subpage_prot.c
index 2ef24a53f4c9..27daeed1a141 100644
--- a/arch/powerpc/mm/book3s64/subpage_prot.c
+++ b/arch/powerpc/mm/book3s64/subpage_prot.c
@@ -54,6 +54,7 @@ static void hpte_flush_range(struct mm_struct *mm, unsigned long addr,
int npages)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -62,7 +63,10 @@ static void hpte_flush_range(struct mm_struct *mm, unsigned long addr,
pgd = pgd_offset(mm, addr);
if (pgd_none(*pgd))
return;
- pud = pud_offset(pgd, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d))
+ return;
+ pud = pud_offset(p4d, addr);
if (pud_none(*pud))
return;
pmd = pmd_offset(pud, addr);
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 73d4873fc7f8..43d463f20fc3 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -112,6 +112,7 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz)
{
pgd_t *pg;
+ p4d_t *p4;
pud_t *pu;
pmd_t *pm;
hugepd_t *hpdp = NULL;
@@ -121,20 +122,21 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz

addr &= ~(sz-1);
pg = pgd_offset(mm, addr);
+ p4 = p4d_offset(pg, addr);

#ifdef CONFIG_PPC_BOOK3S_64
if (pshift == PGDIR_SHIFT)
/* 16GB huge page */
- return (pte_t *) pg;
+ return (pte_t *) p4;
else if (pshift > PUD_SHIFT) {
/*
* We need to use hugepd table
*/
ptl = &mm->page_table_lock;
- hpdp = (hugepd_t *)pg;
+ hpdp = (hugepd_t *)p4;
} else {
pdshift = PUD_SHIFT;
- pu = pud_alloc(mm, pg, addr);
+ pu = pud_alloc(mm, p4, addr);
if (!pu)
return NULL;
if (pshift == PUD_SHIFT)
@@ -159,10 +161,10 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz
#else
if (pshift >= PGDIR_SHIFT) {
ptl = &mm->page_table_lock;
- hpdp = (hugepd_t *)pg;
+ hpdp = (hugepd_t *)p4;
} else {
pdshift = PUD_SHIFT;
- pu = pud_alloc(mm, pg, addr);
+ pu = pud_alloc(mm, p4, addr);
if (!pu)
return NULL;
if (pshift >= PUD_SHIFT) {
@@ -384,7 +386,7 @@ static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
mm_dec_nr_pmds(tlb->mm);
}

-static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
+static void hugetlb_free_pud_range(struct mmu_gather *tlb, p4d_t *p4d,
unsigned long addr, unsigned long end,
unsigned long floor, unsigned long ceiling)
{
@@ -394,7 +396,7 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,

start = addr;
do {
- pud = pud_offset(pgd, addr);
+ pud = pud_offset(p4d, addr);
next = pud_addr_end(addr, end);
if (!is_hugepd(__hugepd(pud_val(*pud)))) {
if (pud_none_or_clear_bad(pud))
@@ -429,8 +431,8 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
if (end - 1 > ceiling - 1)
return;

- pud = pud_offset(pgd, start);
- pgd_clear(pgd);
+ pud = pud_offset(p4d, start);
+ p4d_clear(p4d);
pud_free_tlb(tlb, pud, start);
mm_dec_nr_puds(tlb->mm);
}
@@ -443,6 +445,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb,
unsigned long floor, unsigned long ceiling)
{
pgd_t *pgd;
+ p4d_t *p4d;
unsigned long next;

/*
@@ -465,10 +468,11 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb,
do {
next = pgd_addr_end(addr, end);
pgd = pgd_offset(tlb->mm, addr);
+ p4d = p4d_offset(pgd, addr);
if (!is_hugepd(__hugepd(pgd_val(*pgd)))) {
- if (pgd_none_or_clear_bad(pgd))
+ if (p4d_none_or_clear_bad(p4d))
continue;
- hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling);
+ hugetlb_free_pud_range(tlb, p4d, addr, next, floor, ceiling);
} else {
unsigned long more;
/*
@@ -481,7 +485,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb,
if (more > next)
next = more;

- free_hugepd_range(tlb, (hugepd_t *)pgd, PGDIR_SHIFT,
+ free_hugepd_range(tlb, (hugepd_t *)p4d, PGDIR_SHIFT,
addr, next, floor, ceiling);
}
} while (addr = next, addr != end);
diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c
index 0e6ed4413eea..cac0452cbe1f 100644
--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -36,7 +36,7 @@ static int __ref kasan_init_shadow_page_tables(unsigned long k_start, unsigned l
unsigned long k_cur, k_next;
pgprot_t prot = slab_is_available() ? kasan_prot_ro() : PAGE_KERNEL;

- pmd = pmd_offset(pud_offset(pgd_offset_k(k_start), k_start), k_start);
+ pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(k_start), k_start), k_start), k_start);

for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++) {
pte_t *new;
@@ -94,7 +94,7 @@ static int __ref kasan_init_region(void *start, size_t size)
block = memblock_alloc(k_end - k_start, PAGE_SIZE);

for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
- pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur);
+ pmd_t *pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(k_cur), k_cur), k_cur), k_cur);
void *va = block ? block + k_cur - k_start : kasan_get_one_page();
pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);

@@ -118,7 +118,7 @@ static void __init kasan_remap_early_shadow_ro(void)
kasan_populate_pte(kasan_early_shadow_pte, prot);

for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
- pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur);
+ pmd_t *pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(k_cur), k_cur), k_cur), k_cur);
pte_t *ptep = pte_offset_kernel(pmd, k_cur);

if ((pte_val(*ptep) & PTE_RPN_MASK) != pa)
@@ -205,7 +205,7 @@ void __init kasan_early_init(void)
unsigned long addr = KASAN_SHADOW_START;
unsigned long end = KASAN_SHADOW_END;
unsigned long next;
- pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(addr), addr), addr);
+ pmd_t *pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(addr), addr), addr), addr);

BUILD_BUG_ON(KASAN_SHADOW_START & ~PGDIR_MASK);

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 9488b63dfc87..ed2e24e493b9 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -68,8 +68,8 @@ EXPORT_SYMBOL(kmap_prot);

static inline pte_t *virt_to_kpte(unsigned long vaddr)
{
- return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
- vaddr), vaddr), vaddr);
+ return pte_offset_kernel(pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr),
+ vaddr), vaddr), vaddr), vaddr);
}
#endif

diff --git a/arch/powerpc/mm/nohash/40x.c b/arch/powerpc/mm/nohash/40x.c
index f348104eb461..7aaf7155e350 100644
--- a/arch/powerpc/mm/nohash/40x.c
+++ b/arch/powerpc/mm/nohash/40x.c
@@ -104,7 +104,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
pmd_t *pmdp;
unsigned long val = p | _PMD_SIZE_16M | _PAGE_EXEC | _PAGE_HWWRITE;

- pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v);
+ pmdp = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(v), v), v), v);
*pmdp++ = __pmd(val);
*pmdp++ = __pmd(val);
*pmdp++ = __pmd(val);
@@ -119,7 +119,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
pmd_t *pmdp;
unsigned long val = p | _PMD_SIZE_4M | _PAGE_EXEC | _PAGE_HWWRITE;

- pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v);
+ pmdp = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(v), v), v), v);
*pmdp = __pmd(val);

v += LARGE_PAGE_SIZE_4M;
diff --git a/arch/powerpc/mm/nohash/book3e_pgtable.c b/arch/powerpc/mm/nohash/book3e_pgtable.c
index 4637fdd469cf..a62d59a928be 100644
--- a/arch/powerpc/mm/nohash/book3e_pgtable.c
+++ b/arch/powerpc/mm/nohash/book3e_pgtable.c
@@ -73,6 +73,7 @@ static void __init *early_alloc_pgtable(unsigned long size)
int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
{
pgd_t *pgdp;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@@ -80,7 +81,10 @@ int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
BUILD_BUG_ON(TASK_SIZE_USER64 > PGTABLE_RANGE);
if (slab_is_available()) {
pgdp = pgd_offset_k(ea);
- pudp = pud_alloc(&init_mm, pgdp, ea);
+ p4dp = p4d_alloc(&init_mm, pgdp, ea);
+ if (!p4dp)
+ return -ENOMEM;
+ pudp = pud_alloc(&init_mm, p4dp, ea);
if (!pudp)
return -ENOMEM;
pmdp = pmd_alloc(&init_mm, pudp, ea);
@@ -91,13 +95,16 @@ int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot)
return -ENOMEM;
} else {
pgdp = pgd_offset_k(ea);
-#ifndef __PAGETABLE_PUD_FOLDED
if (pgd_none(*pgdp)) {
pudp = early_alloc_pgtable(PUD_TABLE_SIZE);
pgd_populate(&init_mm, pgdp, pudp);
}
-#endif /* !__PAGETABLE_PUD_FOLDED */
- pudp = pud_offset(pgdp, ea);
+ p4dp = p4d_offset(pgdp, ea);
+ if (p4d_none(*p4dp)) {
+ pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
+ p4d_populate(&init_mm, p4dp, pmdp);
+ }
+ pudp = pud_offset(p4dp, ea);
if (pud_none(*pudp)) {
pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
pud_populate(&init_mm, pudp, pmdp);
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index e3759b69f81b..dca6a72da26a 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);
/*
@@ -313,6 +316,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
bool *is_thp, unsigned *hpage_shift)
{
pgd_t pgd, *pgdp;
+ p4d_t p4d, *p4dp;
pud_t pud, *pudp;
pmd_t pmd, *pmdp;
pte_t *ret_pte;
@@ -346,13 +350,30 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea,
goto out_huge;
}

+ pdshift = P4D_SHIFT;
+ p4dp = p4d_offset(&pgd, ea);
+ p4d = READ_ONCE(*p4dp);
+
+ if (p4d_none(p4d))
+ return NULL;
+
+ if (p4d_is_leaf(p4d)) {
+ ret_pte = (pte_t *)p4dp;
+ goto out;
+ }
+
+ if (is_hugepd(__hugepd(p4d_val(p4d)))) {
+ hpdp = (hugepd_t *)&p4d;
+ goto out_huge;
+ }
+
/*
* Even if we end up with an unmap, the pgtable will not
* be freed, because we do an rcu free and here we are
* irq disabled
*/
pdshift = PUD_SHIFT;
- pudp = pud_offset(&pgd, ea);
+ pudp = pud_offset(&p4d, ea);
pud = READ_ONCE(*pudp);

if (pud_none(pud))
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 73b84166d06a..50d97127a801 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -63,7 +63,7 @@ int __ref map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot)
int err = -ENOMEM;

/* Use upper 10 bits of VA to index the first level map */
- pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
+ pd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va);
/* Use middle 10 bits of VA to index the second-level map */
if (likely(slab_is_available()))
pg = pte_alloc_kernel(pd, va);
@@ -130,6 +130,7 @@ static int
get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -137,17 +138,20 @@ get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)

pgd = pgd_offset(mm, addr & PAGE_MASK);
if (pgd) {
- pud = pud_offset(pgd, addr & PAGE_MASK);
- if (pud && pud_present(*pud)) {
- pmd = pmd_offset(pud, addr & PAGE_MASK);
- if (pmd_present(*pmd)) {
- pte = pte_offset_map(pmd, addr & PAGE_MASK);
- if (pte) {
- retval = 1;
- *ptep = pte;
- if (pmdp)
- *pmdp = pmd;
- /* XXX caller needs to do pte_unmap, yuck */
+ p4d = p4d_offset(pgd, addr & PAGE_MASK);
+ if (p4d && p4d_present(*p4d)) {
+ pud = pud_offset(p4d, addr & PAGE_MASK);
+ if (pud && pud_present(*pud)) {
+ pmd = pmd_offset(pud, addr & PAGE_MASK);
+ if (pmd_present(*pmd)) {
+ pte = pte_offset_map(pmd, addr & PAGE_MASK);
+ if (pte) {
+ retval = 1;
+ *ptep = pte;
+ if (pmdp)
+ *pmdp = pmd;
+ /* XXX caller needs to do pte_unmap, yuck */
+ }
}
}
}
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index e78832dce7bb..1f86a88fd4bb 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -101,13 +101,13 @@ EXPORT_SYMBOL(__pte_frag_size_shift);

#ifndef __PAGETABLE_PUD_FOLDED
/* 4 level page table */
-struct page *pgd_page(pgd_t pgd)
+struct page *p4d_page(p4d_t p4d)
{
- if (pgd_is_leaf(pgd)) {
- VM_WARN_ON(!pgd_huge(pgd));
- return pte_page(pgd_pte(pgd));
+ if (p4d_is_leaf(p4d)) {
+ VM_WARN_ON(!p4d_huge(p4d));
+ return pte_page(p4d_pte(p4d));
}
- return virt_to_page(pgd_page_vaddr(pgd));
+ return virt_to_page(p4d_page_vaddr(p4d));
}
#endif

diff --git a/arch/powerpc/mm/ptdump/hashpagetable.c b/arch/powerpc/mm/ptdump/hashpagetable.c
index a07278027c6f..ac360ad865a8 100644
--- a/arch/powerpc/mm/ptdump/hashpagetable.c
+++ b/arch/powerpc/mm/ptdump/hashpagetable.c
@@ -417,9 +417,9 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
}
}

-static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
+static void walk_pud(struct pg_state *st, p4d_t *p4d, unsigned long start)
{
- pud_t *pud = pud_offset(pgd, 0);
+ pud_t *pud = pud_offset(p4d, 0);
unsigned long addr;
unsigned int i;

@@ -431,6 +431,20 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
}
}

+static void walk_p4d(struct pg_state *st, pgd_t *pgd, unsigned long start)
+{
+ p4d_t *p4d = p4d_offset(pgd, 0);
+ unsigned long addr;
+ unsigned int i;
+
+ for (i = 0; i < PTRS_PER_P4D; i++, p4d++) {
+ addr = start + i * P4D_SIZE;
+ if (!p4d_none(*p4d))
+ /* p4d exists */
+ walk_pud(st, p4d, addr);
+ }
+}
+
static void walk_pagetables(struct pg_state *st)
{
pgd_t *pgd = pgd_offset_k(0UL);
@@ -445,7 +459,7 @@ static void walk_pagetables(struct pg_state *st)
addr = KERN_VIRT_START + i * PGDIR_SIZE;
if (!pgd_none(*pgd))
/* pgd exists */
- walk_pud(st, pgd, addr);
+ walk_p4d(st, pgd, addr);
}
}

diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index 2f9ddc29c535..5c2f3b916ac8 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -273,9 +273,9 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
}
}

-static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
+static void walk_pud(struct pg_state *st, p4d_t *p4d, unsigned long start)
{
- pud_t *pud = pud_offset(pgd, 0);
+ pud_t *pud = pud_offset(p4d, 0);
unsigned long addr;
unsigned int i;

@@ -289,6 +289,22 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
}
}

+static void walk_p4d(struct pg_state *st, pgd_t *pgd, unsigned long start)
+{
+ p4d_t *p4d = p4d_offset(pgd, 0);
+ unsigned long addr;
+ unsigned int i;
+
+ for (i = 0; i < PTRS_PER_P4D; i++, p4d++) {
+ addr = start + i * P4D_SIZE;
+ if (!p4d_none(*p4d) && !p4d_is_leaf(*p4d))
+ /* p4d exists */
+ walk_pud(st, p4d, addr);
+ else
+ note_page(st, addr, 2, p4d_val(*p4d));
+ }
+}
+
static void walk_pagetables(struct pg_state *st)
{
unsigned int i;
@@ -302,7 +318,7 @@ static void walk_pagetables(struct pg_state *st)
for (i = pgd_index(addr); i < PTRS_PER_PGD; i++, pgd++, addr += PGDIR_SIZE) {
if (!pgd_none(*pgd) && !pgd_is_leaf(*pgd))
/* pgd exists */
- walk_pud(st, pgd, addr);
+ walk_p4d(st, pgd, addr);
else
note_page(st, addr, 1, pgd_val(*pgd));
}
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index a7056049709e..dd36e10efa65 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -3128,6 +3128,7 @@ static void show_pte(unsigned long addr)
struct task_struct *tsk = NULL;
struct mm_struct *mm;
pgd_t *pgdp, *pgdir;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@@ -3172,7 +3173,21 @@ static void show_pte(unsigned long addr)
}
printf("pgdp @ 0x%px = 0x%016lx\n", pgdp, pgd_val(*pgdp));

- pudp = pud_offset(pgdp, addr);
+ p4dp = p4d_offset(pgdp, addr);
+
+ if (p4d_none(*p4dp)) {
+ printf("No valid P4D\n");
+ return;
+ }
+
+ if (p4d_is_leaf(*p4dp)) {
+ format_pte(p4dp, p4d_val(*p4dp));
+ return;
+ }
+
+ printf("p4dp @ 0x%px = 0x%016lx\n", p4dp, p4d_val(*p4dp));
+
+ pudp = pud_offset(p4dp, addr);

if (pud_none(*pudp)) {
printf("No valid PUD\n");
--
2.24.0