mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
1e531cce68
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>
156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/*
|
|
* Based on arch/arm/include/asm/pgalloc.h
|
|
*
|
|
* Copyright (C) 2000-2001 Russell King
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_PGALLOC_H
|
|
#define __ASM_PGALLOC_H
|
|
|
|
#include <asm/pgtable-hwdef.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
#define check_pgt_cache() do { } while (0)
|
|
|
|
#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
|
|
#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
|
|
|
|
#if CONFIG_PGTABLE_LEVELS > 2
|
|
|
|
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
return (pmd_t *)__get_free_page(PGALLOC_GFP);
|
|
}
|
|
|
|
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
|
|
{
|
|
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
|
|
free_page((unsigned long)pmd);
|
|
}
|
|
|
|
static inline void __pud_populate(pud_t *pud, phys_addr_t pmd, pudval_t prot)
|
|
{
|
|
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
|
|
|
|
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
return (pud_t *)__get_free_page(PGALLOC_GFP);
|
|
}
|
|
|
|
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
|
|
{
|
|
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
|
|
free_page((unsigned long)pud);
|
|
}
|
|
|
|
static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pud, pgdval_t prot)
|
|
{
|
|
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);
|
|
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
|
|
|
|
static inline pte_t *
|
|
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
return (pte_t *)__get_free_page(PGALLOC_GFP);
|
|
}
|
|
|
|
static inline pgtable_t
|
|
pte_alloc_one(struct mm_struct *mm, unsigned long addr)
|
|
{
|
|
struct page *pte;
|
|
|
|
pte = alloc_pages(PGALLOC_GFP, 0);
|
|
if (!pte)
|
|
return NULL;
|
|
if (!pgtable_page_ctor(pte)) {
|
|
__free_page(pte);
|
|
return NULL;
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
/*
|
|
* Free a PTE table.
|
|
*/
|
|
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
|
|
{
|
|
if (pte)
|
|
free_page((unsigned long)pte);
|
|
}
|
|
|
|
static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
|
|
{
|
|
pgtable_page_dtor(pte);
|
|
__free_page(pte);
|
|
}
|
|
|
|
static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
|
|
pmdval_t prot)
|
|
{
|
|
set_pmd(pmdp, __pmd(pte | prot));
|
|
}
|
|
|
|
/*
|
|
* Populate the pmdp entry with a pointer to the pte. This pmd is part
|
|
* of the mm address space.
|
|
*/
|
|
static inline void
|
|
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
|
|
{
|
|
/*
|
|
* The pmd must be loaded with the physical address of the PTE table
|
|
*/
|
|
__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
|
|
}
|
|
|
|
static inline void
|
|
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
|
|
{
|
|
__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
|
|
}
|
|
#define pmd_pgtable(pmd) pmd_page(pmd)
|
|
|
|
#endif
|