forked from Minki/linux
arm64: mm: dump: make page table dumping reusable
For debugging purposes, it would be nice if we could export page tables other than the swapper_pg_dir to userspace. To enable this, this patch refactors the arm64 page table dumping code such that multiple tables may be registered with the framework, and exported under debugfs. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Laura Abbott <labbott@fedoraproject.org> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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arch/arm64/include/asm/ptdump.h
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44
arch/arm64/include/asm/ptdump.h
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@ -0,0 +1,44 @@
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/*
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* Copyright (C) 2014 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_PTDUMP_H
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#define __ASM_PTDUMP_H
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#ifdef CONFIG_ARM64_PTDUMP
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#include <linux/mm_types.h>
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struct addr_marker {
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unsigned long start_address;
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char *name;
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};
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struct ptdump_info {
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struct mm_struct *mm;
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const struct addr_marker *markers;
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unsigned long base_addr;
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unsigned long max_addr;
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};
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int ptdump_register(struct ptdump_info *info, const char *name);
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#else
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static inline int ptdump_register(struct ptdump_info *info, const char *name)
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{
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return 0;
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}
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#endif /* CONFIG_ARM64_PTDUMP */
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#endif /* __ASM_PTDUMP_H */
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@ -27,11 +27,7 @@
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#include <asm/memory.h>
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#include <asm/pgtable.h>
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#include <asm/pgtable-hwdef.h>
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struct addr_marker {
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unsigned long start_address;
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const char *name;
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};
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#include <asm/ptdump.h>
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static const struct addr_marker address_markers[] = {
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#ifdef CONFIG_KASAN
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@ -290,7 +286,8 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
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}
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}
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static void walk_pgd(struct pg_state *st, struct mm_struct *mm, unsigned long start)
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static void walk_pgd(struct pg_state *st, struct mm_struct *mm,
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unsigned long start)
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{
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pgd_t *pgd = pgd_offset(mm, 0UL);
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unsigned i;
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@ -309,12 +306,13 @@ static void walk_pgd(struct pg_state *st, struct mm_struct *mm, unsigned long st
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static int ptdump_show(struct seq_file *m, void *v)
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{
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struct ptdump_info *info = m->private;
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struct pg_state st = {
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.seq = m,
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.marker = address_markers,
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.marker = info->markers,
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};
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walk_pgd(&st, &init_mm, VA_START);
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walk_pgd(&st, info->mm, info->base_addr);
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note_page(&st, 0, 0, 0);
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return 0;
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@ -322,7 +320,7 @@ static int ptdump_show(struct seq_file *m, void *v)
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static int ptdump_open(struct inode *inode, struct file *file)
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{
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return single_open(file, ptdump_show, NULL);
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return single_open(file, ptdump_show, inode->i_private);
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}
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static const struct file_operations ptdump_fops = {
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@ -332,7 +330,7 @@ static const struct file_operations ptdump_fops = {
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.release = single_release,
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};
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static int ptdump_init(void)
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int ptdump_register(struct ptdump_info *info, const char *name)
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{
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struct dentry *pe;
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unsigned i, j;
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@ -342,8 +340,18 @@ static int ptdump_init(void)
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for (j = 0; j < pg_level[i].num; j++)
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pg_level[i].mask |= pg_level[i].bits[j].mask;
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pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
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&ptdump_fops);
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pe = debugfs_create_file(name, 0400, NULL, info, &ptdump_fops);
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return pe ? 0 : -ENOMEM;
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}
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static struct ptdump_info kernel_ptdump_info = {
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.mm = &init_mm,
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.markers = address_markers,
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.base_addr = VA_START,
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};
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static int ptdump_init(void)
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{
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return ptdump_register(&kernel_ptdump_info, "kernel_page_tables");
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}
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device_initcall(ptdump_init);
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