[RFC PATCH 3/9] powerpc/mm/64: Use physical addresses in upper page table tree levels
Paul Mackerras
paulus at samba.org
Sat Feb 20 17:12:34 AEDT 2016
This changes the Linux page tables to store physical addresses
rather than kernel virtual addresses in the upper levels of the
tree (pgd, pud and pmd) for all 64-bit machines.
This frees up some high order bits, and will be needed with book3s
PowerISA v3.0 machines which read the page table tree in hardware
in radix mode.
Signed-off-by: Paul Mackerras <paulus at samba.org>
---
arch/powerpc/include/asm/book3s/64/hash-4k.h | 2 +-
arch/powerpc/include/asm/book3s/64/hash.h | 10 ++++------
arch/powerpc/include/asm/nohash/64/pgtable-4k.h | 2 +-
arch/powerpc/include/asm/nohash/64/pgtable.h | 10 ++++------
arch/powerpc/include/asm/pgalloc-64.h | 16 ++++++++--------
5 files changed, 18 insertions(+), 22 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h
index bee3643..0425d3e 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-4k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h
@@ -64,7 +64,7 @@
#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 pgd_page_vaddr(pgd) __va(pgd_val(pgd) & ~PGD_MASKED_BITS)
static inline void pgd_clear(pgd_t *pgdp)
{
diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 64eff40..fcab33f 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -222,13 +222,11 @@
#define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
#ifndef __ASSEMBLY__
-#define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
- || (pmd_val(pmd) & PMD_BAD_BITS))
-#define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
+#define pmd_bad(pmd) (pmd_val(pmd) & PMD_BAD_BITS)
+#define pmd_page_vaddr(pmd) __va(pmd_val(pmd) & ~PMD_MASKED_BITS)
-#define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
- || (pud_val(pud) & PUD_BAD_BITS))
-#define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS)
+#define pud_bad(pud) (pud_val(pud) & PUD_BAD_BITS)
+#define pud_page_vaddr(pud) __va(pud_val(pud) & ~PUD_MASKED_BITS)
#define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
#define pmd_index(address) (((address) >> (PMD_SHIFT)) & (PTRS_PER_PMD - 1))
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
index fc7d517..c8319e8 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h
@@ -55,7 +55,7 @@
#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 pgd_page_vaddr(pgd) __va(pgd_val(pgd) & ~PGD_MASKED_BITS)
#ifndef __ASSEMBLY__
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index b9f734d..484c0e1 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -127,10 +127,9 @@ static inline pte_t pmd_pte(pmd_t pmd)
}
#define pmd_none(pmd) (!pmd_val(pmd))
-#define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
- || (pmd_val(pmd) & PMD_BAD_BITS))
+#define pmd_bad(pmd) (pmd_val(pmd) & PMD_BAD_BITS)
#define pmd_present(pmd) (!pmd_none(pmd))
-#define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
+#define pmd_page_vaddr(pmd) __va(pmd_val(pmd) & ~PMD_MASKED_BITS)
extern struct page *pmd_page(pmd_t pmd);
static inline void pud_set(pud_t *pudp, unsigned long val)
@@ -144,10 +143,9 @@ static inline void pud_clear(pud_t *pudp)
}
#define pud_none(pud) (!pud_val(pud))
-#define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
- || (pud_val(pud) & PUD_BAD_BITS))
+#define pud_bad(pud) (pud_val(pud) & PUD_BAD_BITS)
#define pud_present(pud) (pud_val(pud) != 0)
-#define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS)
+#define pud_page_vaddr(pud) __va(pud_val(pud) & ~PUD_MASKED_BITS)
extern struct page *pud_page(pud_t pud);
diff --git a/arch/powerpc/include/asm/pgalloc-64.h b/arch/powerpc/include/asm/pgalloc-64.h
index 69ef28a..4f4609d 100644
--- a/arch/powerpc/include/asm/pgalloc-64.h
+++ b/arch/powerpc/include/asm/pgalloc-64.h
@@ -53,7 +53,7 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
#ifndef CONFIG_PPC_64K_PAGES
-#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, (unsigned long)PUD)
+#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, __pa(PUD))
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
@@ -68,19 +68,19 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
- pud_set(pud, (unsigned long)pmd);
+ pud_set(pud, __pa(pmd));
}
static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
pte_t *pte)
{
- pmd_set(pmd, (unsigned long)pte);
+ pmd_set(pmd, __pa(pte));
}
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
pgtable_t pte_page)
{
- pmd_set(pmd, (unsigned long)page_address(pte_page));
+ pmd_set(pmd, __pa(page_address(pte_page)));
}
#define pmd_pgtable(pmd) pmd_page(pmd)
@@ -171,23 +171,23 @@ extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
extern void __tlb_remove_table(void *_table);
#endif
-#define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd)
+#define pud_populate(mm, pud, pmd) pud_set(pud, __pa(pmd))
static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
pte_t *pte)
{
- pmd_set(pmd, (unsigned long)pte);
+ pmd_set(pmd, __pa(pte));
}
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
pgtable_t pte_page)
{
- pmd_set(pmd, (unsigned long)pte_page);
+ pmd_set(pmd, __pa(pte_page));
}
static inline pgtable_t pmd_pgtable(pmd_t pmd)
{
- return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS);
+ return (pgtable_t)__va(pmd_val(pmd) & ~PMD_MASKED_BITS);
}
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
--
2.5.0
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