xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: 8735/1: mm: dump: make page table dumping reusable

Browse Source 
This patch refactors the arm page table dumping code,
so multiple tables may be registered with the framework.

This patch refers below commits of arm64.
(4674fdb9f1 ("arm64: mm: dump: make page table dumping reusable"))
(4ddb9bf833 ("arm64: dump: Make ptdump debugfs a separate option"))

Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Jinbum Park <jinb.park7@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Jinbum Park
2017-12-12 01:41:09 +01:00
committed by Russell King
parent 6fbab054ec
commit 4fb69cc456
5 changed files with 106 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/mm/Makefile
View File

@@ -13,7 +13,8 @@ obj-y += nommu.o
obj-$(CONFIG_ARM_MPU) += pmsa-v7.o
endif
obj-$(CONFIG_ARM_PTDUMP) += dump.o
obj-$(CONFIG_ARM_PTDUMP_CORE) += dump.o
obj-$(CONFIG_ARM_PTDUMP_DEBUGFS) += ptdump_debugfs.o
obj-$(CONFIG_MODULES) += proc-syms.o
obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o

69
arch/arm/mm/dump.c
View File

@@ -21,11 +21,7 @@
#include <asm/fixmap.h>
#include <asm/memory.h>
#include <asm/pgtable.h>
struct addr_marker {
unsigned long start_address;
const char *name;
};
#include <asm/ptdump.h>
static struct addr_marker address_markers[] = {
{ MODULES_VADDR, "Modules" },
@@ -335,50 +331,36 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
}
}
static void walk_pgd(struct seq_file *m)
static void walk_pgd(struct pg_state *st, struct mm_struct *mm,
unsigned long start)
{
pgd_t *pgd = swapper_pg_dir;
struct pg_state st;
unsigned long addr;
pgd_t *pgd = pgd_offset(mm, 0UL);
unsigned i;
memset(&st, 0, sizeof(st));
st.seq = m;
st.marker = address_markers;
unsigned long addr;
for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
addr = i * PGDIR_SIZE;
addr = start + i * PGDIR_SIZE;
if (!pgd_none(*pgd)) {
walk_pud(&st, pgd, addr);
walk_pud(st, pgd, addr);
} else {
note_page(&st, addr, 1, pgd_val(*pgd), NULL);
note_page(st, addr, 1, pgd_val(*pgd), NULL);
}
}
}
void ptdump_walk_pgd(struct seq_file *m, struct ptdump_info *info)
{
struct pg_state st = {
.seq = m,
.marker = info->markers,
};
walk_pgd(&st, info->mm, info->base_addr);
note_page(&st, 0, 0, 0, NULL);
}
static int ptdump_show(struct seq_file *m, void *v)
static void ptdump_initialize(void)
{
walk_pgd(m);
return 0;
}
static int ptdump_open(struct inode *inode, struct file *file)
{
return single_open(file, ptdump_show, NULL);
}
static const struct file_operations ptdump_fops = {
.open = ptdump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int ptdump_init(void)
{
struct dentry *pe;
unsigned i, j;
for (i = 0; i < ARRAY_SIZE(pg_level); i++)
@@ -387,9 +369,18 @@ static int ptdump_init(void)
pg_level[i].mask |= pg_level[i].bits[j].mask;
address_markers[2].start_address = VMALLOC_START;
}
pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
&ptdump_fops);
return pe ? 0 : -ENOMEM;
static struct ptdump_info kernel_ptdump_info = {
.mm = &init_mm,
.markers = address_markers,
.base_addr = 0,
};
static int ptdump_init(void)
{
ptdump_initialize();
return ptdump_debugfs_register(&kernel_ptdump_info,
"kernel_page_tables");
}
__initcall(ptdump_init);

34
arch/arm/mm/ptdump_debugfs.c Normal file
View File

@@ -0,0 +1,34 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <asm/ptdump.h>
static int ptdump_show(struct seq_file *m, void *v)
{
struct ptdump_info *info = m->private;
ptdump_walk_pgd(m, info);
return 0;
}
static int ptdump_open(struct inode *inode, struct file *file)
{
return single_open(file, ptdump_show, inode->i_private);
}
static const struct file_operations ptdump_fops = {
.open = ptdump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
int ptdump_debugfs_register(struct ptdump_info *info, const char *name)
{
struct dentry *pe;
pe = debugfs_create_file(name, 0400, NULL, info, &ptdump_fops);
return pe ? 0 : -ENOMEM;
}