kernel-fxtec-pro1x/arch/arm64/include/asm/pgalloc.h
Mark Rutland 15670ef1ea arm64: pgalloc: consistently use PGALLOC_GFP
We currently allocate different levels of page tables with a variety of
differing flags, and the PGALLOC_GFP flags, intended for use when
allocating any level of page table, are only used for ptes in
pte_alloc_one. On x86, PGALLOC_GFP is used for all page table
allocations.

Currently the major differences are:

* __GFP_NOTRACK -- Needed to ensure page tables are always accessible in
  the presence of kmemcheck to prevent recursive faults. Currently
  kmemcheck cannot be selected for arm64.

* __GFP_REPEAT -- Causes the allocator to try to reclaim pages and retry
  upon a failure to allocate.

* __GFP_ZERO -- Sometimes passed explicitly, sometimes zalloc variants
  are used.

While we've no encountered issues so far, it would be preferable to be
consistent. This patch ensures all levels of table are allocated in the
same manner, with PGALLOC_GFP.

Cc: Steve Capper <steve.capper@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-11-20 12:05:18 +00:00

136 lines
3.3 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)
#if CONFIG_ARM64_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(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
}
#endif /* CONFIG_ARM64_PGTABLE_LEVELS > 2 */
#if CONFIG_ARM64_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(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
{
set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
}
#endif /* CONFIG_ARM64_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