The patch titled
Subject: powerpc: add support for folded p4d page tables
has been added to the -mm tree. Its filename is
powerpc-add-support-for-folded-p4d-page-tables.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/powerpc-add-support-for-folded-p4d-page-tables.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/powerpc-add-support-for-folded-p4d-page-tables.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Subject: 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.
Link: http://lkml.kernel.org/r/20200414153455.21744-9-rppt@xxxxxxxxxx
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Tested-by: Christophe Leroy <christophe.leroy@xxxxxx> # 8xx and 83xx
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Brian Cain <bcain@xxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: Guan Xuetao <gxt@xxxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Jonas Bonn <jonas@xxxxxxxxxxxx>
Cc: Julien Thierry <julien.thierry.kdev@xxxxxxxxx>
Cc: Ley Foon Tan <ley.foon.tan@xxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Stafford Horne <shorne@xxxxxxxxx>
Cc: Stefan Kristiansson <stefan.kristiansson@xxxxxxxxxxxxx>
Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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 | 60 +++++++-------
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
arch/powerpc/include/asm/nohash/64/pgtable-4k.h | 32 +++----
arch/powerpc/include/asm/nohash/64/pgtable.h | 6 -
arch/powerpc/include/asm/pgtable.h | 10 +-
arch/powerpc/kvm/book3s_64_mmu_radix.c | 32 ++++---
arch/powerpc/lib/code-patching.c | 7 +
arch/powerpc/mm/book3s64/hash_pgtable.c | 4
arch/powerpc/mm/book3s64/radix_pgtable.c | 26 +++---
arch/powerpc/mm/book3s64/subpage_prot.c | 6 -
arch/powerpc/mm/hugetlbpage.c | 28 +++---
arch/powerpc/mm/nohash/book3e_pgtable.c | 15 +--
arch/powerpc/mm/pgtable.c | 30 ++++---
arch/powerpc/mm/pgtable_64.c | 10 +-
arch/powerpc/mm/ptdump/hashpagetable.c | 20 +++-
arch/powerpc/mm/ptdump/ptdump.c | 14 +--
arch/powerpc/xmon/xmon.c | 18 ++--
22 files changed, 197 insertions(+), 139 deletions(-)
--- a/arch/powerpc/include/asm/book3s/32/pgtable.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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>
--- a/arch/powerpc/include/asm/book3s/64/hash.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/include/asm/book3s/64/hash.h
@@ -134,9 +134,9 @@ static inline int get_region_id(unsigned
#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);
--- a/arch/powerpc/include/asm/book3s/64/pgalloc.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/include/asm/book3s/64/pgalloc.h
@@ -85,9 +85,9 @@ static inline void pgd_free(struct mm_st
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)
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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_shi
/* 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(
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) \
@@ -1370,11 +1376,11 @@ static inline bool pud_is_leaf(pud_t pud
return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE));
}
-#define pgd_is_leaf pgd_is_leaf
-#define pgd_leaf pgd_is_leaf
-static inline bool pgd_is_leaf(pgd_t pgd)
+#define p4d_is_leaf p4d_is_leaf
+#define p4d_leaf p4d_is_leaf
+static inline bool p4d_is_leaf(p4d_t p4d)
{
- return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE));
+ return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PTE));
}
#endif /* __ASSEMBLY__ */
--- a/arch/powerpc/include/asm/book3s/64/radix.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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 p
}
-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
--- a/arch/powerpc/include/asm/nohash/32/pgtable.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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__
--- a/arch/powerpc/include/asm/nohash/64/pgalloc.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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)
{
--- a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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) \
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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);
}
/*
--- a/arch/powerpc/include/asm/pgtable.h~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/include/asm/pgtable.h
@@ -44,12 +44,12 @@ struct mm_struct;
#ifdef CONFIG_PPC32
static inline pmd_t *pmd_ptr(struct mm_struct *mm, unsigned long va)
{
- return pmd_offset(pud_offset(pgd_offset(mm, va), va), va);
+ return pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, va), va), va), va);
}
static inline pmd_t *pmd_ptr_k(unsigned long va)
{
- return pmd_offset(pud_offset(pgd_offset_k(va), va), va);
+ return pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va);
}
static inline pte_t *virt_to_kpte(unsigned long vaddr)
@@ -158,9 +158,9 @@ static inline bool pud_is_leaf(pud_t pud
}
#endif
-#ifndef pgd_is_leaf
-#define pgd_is_leaf pgd_is_leaf
-static inline bool pgd_is_leaf(pgd_t pgd)
+#ifndef p4d_is_leaf
+#define p4d_is_leaf p4d_is_leaf
+static inline bool p4d_is_leaf(p4d_t p4d)
{
return false;
}
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -499,13 +499,14 @@ void kvmppc_free_pgtable_radix(struct kv
unsigned long ig;
for (ig = 0; ig < PTRS_PER_PGD; ++ig, ++pgd) {
+ p4d_t *p4d = p4d_offset(pgd, 0);
pud_t *pud;
- if (!pgd_present(*pgd))
+ if (!p4d_present(*p4d))
continue;
- pud = pud_offset(pgd, 0);
+ pud = pud_offset(p4d, 0);
kvmppc_unmap_free_pud(kvm, pud, lpid);
- pgd_clear(pgd);
+ p4d_clear(p4d);
}
}
@@ -566,6 +567,7 @@ int kvmppc_create_pte(struct kvm *kvm, p
unsigned long *rmapp, struct rmap_nested **n_rmap)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud, *new_pud = NULL;
pmd_t *pmd, *new_pmd = NULL;
pte_t *ptep, *new_ptep = NULL;
@@ -573,9 +575,11 @@ int kvmppc_create_pte(struct kvm *kvm, p
/* Traverse the guest's 2nd-level tree, allocate new levels needed */
pgd = pgtable + pgd_index(gpa);
+ p4d = p4d_offset(pgd, gpa);
+
pud = NULL;
- if (pgd_present(*pgd))
- pud = pud_offset(pgd, gpa);
+ if (p4d_present(*p4d))
+ pud = pud_offset(p4d, gpa);
else
new_pud = pud_alloc_one(kvm->mm, gpa);
@@ -596,13 +600,13 @@ int kvmppc_create_pte(struct kvm *kvm, p
/* Now traverse again under the lock and change the tree */
ret = -ENOMEM;
- if (pgd_none(*pgd)) {
+ 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;
@@ -1219,7 +1223,8 @@ static ssize_t debugfs_radix_read(struct
unsigned long gpa;
pgd_t *pgt;
struct kvm_nested_guest *nested;
- pgd_t pgd, *pgdp;
+ pgd_t *pgdp;
+ p4d_t p4d, *p4dp;
pud_t pud, *pudp;
pmd_t pmd, *pmdp;
pte_t *ptep;
@@ -1292,13 +1297,14 @@ static ssize_t debugfs_radix_read(struct
}
pgdp = pgt + pgd_index(gpa);
- pgd = READ_ONCE(*pgdp);
- if (!(pgd_val(pgd) & _PAGE_PRESENT)) {
- gpa = (gpa & PGDIR_MASK) + PGDIR_SIZE;
+ p4dp = p4d_offset(pgdp, gpa);
+ p4d = READ_ONCE(*p4dp);
+ if (!(p4d_val(p4d) & _PAGE_PRESENT)) {
+ gpa = (gpa & P4D_MASK) + P4D_SIZE;
continue;
}
- pudp = pud_offset(&pgd, gpa);
+ pudp = pud_offset(&p4d, gpa);
pud = READ_ONCE(*pudp);
if (!(pud_val(pud) & _PAGE_PRESENT)) {
gpa = (gpa & PUD_MASK) + PUD_SIZE;
--- a/arch/powerpc/lib/code-patching.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/lib/code-patching.c
@@ -107,13 +107,18 @@ static inline int unmap_patch_area(unsig
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;
--- a/arch/powerpc/mm/book3s64/hash_pgtable.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/book3s64/hash_pgtable.c
@@ -148,6 +148,7 @@ void hash__vmemmap_remove_mapping(unsign
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
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);
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -65,17 +65,19 @@ static int early_map_kernel_page(unsigne
{
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 = 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;
@@ -115,6 +117,7 @@ static int __map_kernel_page(unsigned lo
{
unsigned long pfn = pa >> PAGE_SHIFT;
pgd_t *pgdp;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@@ -137,7 +140,8 @@ static int __map_kernel_page(unsigned lo
* 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) {
@@ -174,6 +178,7 @@ void radix__change_memory_range(unsigned
{
unsigned long idx;
pgd_t *pgdp;
+ p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
@@ -186,7 +191,8 @@ void radix__change_memory_range(unsigned
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)) {
@@ -850,6 +856,7 @@ static void __meminit remove_pagetable(u
unsigned long addr, next;
pud_t *pud_base;
pgd_t *pgd;
+ p4d_t *p4d;
spin_lock(&init_mm.page_table_lock);
@@ -857,15 +864,16 @@ static void __meminit remove_pagetable(u
next = pgd_addr_end(addr, end);
pgd = pgd_offset_k(addr);
- if (!pgd_present(*pgd))
+ p4d = p4d_offset(pgd, addr);
+ if (!p4d_present(*p4d))
continue;
- if (pgd_is_leaf(*pgd)) {
- split_kernel_mapping(addr, end, PGDIR_SIZE, (pte_t *)pgd);
+ if (p4d_is_leaf(*p4d)) {
+ split_kernel_mapping(addr, end, P4D_SIZE, (pte_t *)p4d);
continue;
}
- pud_base = (pud_t *)pgd_page_vaddr(*pgd);
+ pud_base = (pud_t *)p4d_page_vaddr(*p4d);
remove_pud_table(pud_base, addr, next);
}
--- a/arch/powerpc/mm/book3s64/subpage_prot.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/book3s64/subpage_prot.c
@@ -54,15 +54,17 @@ static void hpte_flush_range(struct mm_s
int npages)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
spinlock_t *ptl;
pgd = pgd_offset(mm, addr);
- if (pgd_none(*pgd))
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d))
return;
- pud = pud_offset(pgd, addr);
+ pud = pud_offset(p4d, addr);
if (pud_none(*pud))
return;
pmd = pmd_offset(pud, addr);
--- a/arch/powerpc/mm/hugetlbpage.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/hugetlbpage.c
@@ -119,6 +119,7 @@ static int __hugepte_alloc(struct mm_str
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;
@@ -128,20 +129,21 @@ pte_t *huge_pte_alloc(struct mm_struct *
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)
@@ -166,10 +168,10 @@ pte_t *huge_pte_alloc(struct mm_struct *
#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) {
@@ -390,7 +392,7 @@ static void hugetlb_free_pmd_range(struc
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)
{
@@ -400,7 +402,7 @@ static void hugetlb_free_pud_range(struc
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))
@@ -435,8 +437,8 @@ static void hugetlb_free_pud_range(struc
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);
}
@@ -449,6 +451,7 @@ void hugetlb_free_pgd_range(struct mmu_g
unsigned long floor, unsigned long ceiling)
{
pgd_t *pgd;
+ p4d_t *p4d;
unsigned long next;
/*
@@ -471,10 +474,11 @@ void hugetlb_free_pgd_range(struct mmu_g
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;
/*
@@ -487,7 +491,7 @@ void hugetlb_free_pgd_range(struct mmu_g
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);
--- a/arch/powerpc/mm/nohash/book3e_pgtable.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/nohash/book3e_pgtable.c
@@ -73,6 +73,7 @@ static void __init *early_alloc_pgtable(
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 +81,8 @@ int __ref map_kernel_page(unsigned long
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_offset(pgdp, ea);
+ pudp = pud_alloc(&init_mm, p4dp, ea);
if (!pudp)
return -ENOMEM;
pmdp = pmd_alloc(&init_mm, pudp, ea);
@@ -91,13 +93,12 @@ int __ref map_kernel_page(unsigned long
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);
+ p4dp = p4d_offset(pgdp, ea);
+ if (p4d_none(*p4dp)) {
+ pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
+ p4d_populate(&init_mm, p4dp, pmdp);
}
-#endif /* !__PAGETABLE_PUD_FOLDED */
- pudp = pud_offset(pgdp, ea);
+ pudp = pud_offset(p4dp, ea);
if (pud_none(*pudp)) {
pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
pud_populate(&init_mm, pudp, pmdp);
--- a/arch/powerpc/mm/pgtable_64.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/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
--- a/arch/powerpc/mm/pgtable.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/pgtable.c
@@ -265,6 +265,7 @@ int huge_ptep_set_access_flags(struct vm
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
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, un
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, un
* irq disabled
*/
pdshift = PUD_SHIFT;
- pudp = pud_offset(&pgd, ea);
+ pudp = pud_offset(&p4d, ea);
pud = READ_ONCE(*pudp);
if (pud_none(pud))
--- a/arch/powerpc/mm/ptdump/hashpagetable.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/ptdump/hashpagetable.c
@@ -417,9 +417,9 @@ static void walk_pmd(struct pg_state *st
}
}
-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
}
}
+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_st
addr = KERN_VIRT_START + i * PGDIR_SIZE;
if (!pgd_none(*pgd))
/* pgd exists */
- walk_pud(st, pgd, addr);
+ walk_p4d(st, pgd, addr);
}
}
--- a/arch/powerpc/mm/ptdump/ptdump.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/mm/ptdump/ptdump.c
@@ -277,9 +277,9 @@ static void walk_pmd(struct pg_state *st
}
}
-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;
@@ -304,11 +304,13 @@ static void walk_pagetables(struct pg_st
* the hash pagetable.
*/
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);
+ p4d_t *p4d = p4d_offset(pgd, 0);
+
+ if (!p4d_none(*p4d) && !p4d_is_leaf(*p4d))
+ /* p4d exists */
+ walk_pud(st, p4d, addr);
else
- note_page(st, addr, 1, pgd_val(*pgd));
+ note_page(st, addr, 1, p4d_val(*p4d));
}
}
--- a/arch/powerpc/xmon/xmon.c~powerpc-add-support-for-folded-p4d-page-tables
+++ a/arch/powerpc/xmon/xmon.c
@@ -3136,6 +3136,7 @@ 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;
@@ -3167,20 +3168,21 @@ static void show_pte(unsigned long addr)
pgdir = pgd_offset(mm, 0);
}
- if (pgd_none(*pgdp)) {
- printf("no linux page table for address\n");
+ p4dp = p4d_offset(pgdp, addr);
+
+ if (p4d_none(*p4dp)) {
+ printf("No valid P4D\n");
return;
}
- printf("pgd @ 0x%px\n", pgdir);
-
- if (pgd_is_leaf(*pgdp)) {
- format_pte(pgdp, pgd_val(*pgdp));
+ if (p4d_is_leaf(*p4dp)) {
+ format_pte(p4dp, p4d_val(*p4dp));
return;
}
- printf("pgdp @ 0x%px = 0x%016lx\n", pgdp, pgd_val(*pgdp));
- pudp = pud_offset(pgdp, addr);
+ 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");
_
Patches currently in -mm which might be from rppt@xxxxxxxxxxxxx are
h8300-remove-usage-of-__arch_use_5level_hack.patch
arm-add-support-for-folded-p4d-page-tables.patch
arm64-add-support-for-folded-p4d-page-tables.patch
hexagon-remove-__arch_use_5level_hack.patch
ia64-add-support-for-folded-p4d-page-tables.patch
nios2-add-support-for-folded-p4d-page-tables.patch
openrisc-add-support-for-folded-p4d-page-tables.patch
powerpc-add-support-for-folded-p4d-page-tables.patch
sh-drop-__pxd_offset-macros-that-duplicate-pxd_index-ones.patch
sh-add-support-for-folded-p4d-page-tables.patch
unicore32-remove-__arch_use_5level_hack.patch
asm-generic-remove-pgtable-nop4d-hackh.patch
mm-remove-__arch_has_5level_hack-and-include-asm-generic-5level-fixuph.patch
mm-memblock-replace-dereferences-of-memblock_regionnid-with-api-calls.patch
mm-make-early_pfn_to_nid-and-related-defintions-close-to-each-other.patch
mm-remove-config_have_memblock_node_map-option.patch
mm-free_area_init-use-maximal-zone-pfns-rather-than-zone-sizes.patch
mm-use-free_area_init-instead-of-free_area_init_nodes.patch
alpha-simplify-detection-of-memory-zone-boundaries.patch
arm-simplify-detection-of-memory-zone-boundaries.patch
arm64-simplify-detection-of-memory-zone-boundaries-for-uma-configs.patch
csky-simplify-detection-of-memory-zone-boundaries.patch
m68k-mm-simplify-detection-of-memory-zone-boundaries.patch
parisc-simplify-detection-of-memory-zone-boundaries.patch
sparc32-simplify-detection-of-memory-zone-boundaries.patch
unicore32-simplify-detection-of-memory-zone-boundaries.patch
xtensa-simplify-detection-of-memory-zone-boundaries.patch
mm-remove-early_pfn_in_nid-and-config_nodes_span_other_nodes.patch
mm-free_area_init-allow-defining-max_zone_pfn-in-descending-order.patch
mm-rename-free_area_init_node-to-free_area_init_memoryless_node.patch
mm-clean-up-free_area_init_node-and-its-helpers.patch
mm-simplify-find_min_pfn_with_active_regions.patch
docs-vm-update-memory-models-documentation.patch
