blob: 371c5f03a1708c172e731abb07637e369681fec1 [file] [log] [blame]
Catalin Marinas1d18c472012-03-05 11:49:27 +00001/*
2 * PGD allocation/freeing
3 *
4 * Copyright (C) 2012 ARM Ltd.
5 * Author: Catalin Marinas <catalin.marinas@arm.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/mm.h>
21#include <linux/gfp.h>
22#include <linux/highmem.h>
23#include <linux/slab.h>
24
25#include <asm/pgalloc.h>
26#include <asm/page.h>
27#include <asm/tlbflush.h>
28
Catalin Marinas2a0b5c02014-10-10 15:37:28 +010029static struct kmem_cache *pgd_cache;
30
Catalin Marinas1d18c472012-03-05 11:49:27 +000031pgd_t *pgd_alloc(struct mm_struct *mm)
32{
Catalin Marinas1d18c472012-03-05 11:49:27 +000033 if (PGD_SIZE == PAGE_SIZE)
Mark Rutland15670ef2014-11-19 17:44:12 +000034 return (pgd_t *)__get_free_page(PGALLOC_GFP);
Catalin Marinas1d18c472012-03-05 11:49:27 +000035 else
Mark Rutland15670ef2014-11-19 17:44:12 +000036 return kmem_cache_alloc(pgd_cache, PGALLOC_GFP);
Catalin Marinas1d18c472012-03-05 11:49:27 +000037}
38
39void pgd_free(struct mm_struct *mm, pgd_t *pgd)
40{
41 if (PGD_SIZE == PAGE_SIZE)
42 free_page((unsigned long)pgd);
43 else
Catalin Marinas2a0b5c02014-10-10 15:37:28 +010044 kmem_cache_free(pgd_cache, pgd);
Catalin Marinas1d18c472012-03-05 11:49:27 +000045}
Catalin Marinas2a0b5c02014-10-10 15:37:28 +010046
Will Deacon39b5be92016-01-05 15:36:59 +000047void __init pgd_cache_init(void)
Catalin Marinas2a0b5c02014-10-10 15:37:28 +010048{
Will Deacon39b5be92016-01-05 15:36:59 +000049 if (PGD_SIZE == PAGE_SIZE)
50 return;
51
Catalin Marinas2a0b5c02014-10-10 15:37:28 +010052 /*
53 * Naturally aligned pgds required by the architecture.
54 */
Will Deacon39b5be92016-01-05 15:36:59 +000055 pgd_cache = kmem_cache_create("pgd_cache", PGD_SIZE, PGD_SIZE,
56 SLAB_PANIC, NULL);
Catalin Marinas2a0b5c02014-10-10 15:37:28 +010057}