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arm64: mm: add __{pud,pgd}_populate 

We currently have __pmd_populate for creating a pmd table entry given
the physical address of a pte, but don't have equivalents for the pud or
pgd levels of table.

To enable us to manipulate tables which are mapped outside of the linear
mapping (where we have a PA, but not a linear map VA), it is useful to
have these functions.

This patch adds __{pud,pgd}_populate. As these should not be called when
the kernel uses folded {pmd,pud}s, in these cases they expand to
BUILD_BUG(). So long as the appropriate checks are made on the {pud,pgd}
entry prior to attempting population, these should be optimized out at
compile time.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Cc: Laura Abbott <labbott@fedoraproject.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Rutland 2016-01-25 11:45:06 +00:00 committed by Catalin Marinas
parent 316b39db06
commit 1e531cce68
1 changed files with 22 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/arm64/include/asm/pgalloc.h
View File

@ -42,11 +42,20 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
free_page((unsigned long)pmd);
}
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot)
{
set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
set_pud(pud, __pud(pmd | prot));
}
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
__pud_populate(pud, __pa(pmd), PMD_TYPE_TABLE);
}
#else
static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot)
{
BUILD_BUG();
}
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
#if CONFIG_PGTABLE_LEVELS > 3
@ -62,11 +71,20 @@ static inline void pud_free(struct mm_struct *mm, pud_t *pud)
free_page((unsigned long)pud);
}
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot)
{
set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
set_pgd(pgdp, __pgd(pud | prot));
}
static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
{
__pgd_populate(pgd, __pa(pud), PUD_TYPE_TABLE);
}
#else
static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot)
{
BUILD_BUG();
}
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
extern pgd_t *pgd_alloc(struct mm_struct *mm);