[linux-2.6-block.git] / arch / arm64 / mm / dump.c

/*
 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
 * Debug helper to dump the current kernel pagetables of the system
 * so that we can see what the various memory ranges are set to.
 *
 * Derived from x86 and arm implementation:
 * (C) Copyright 2008 Intel Corporation
 *
 * Author: Arjan van de Ven <arjan@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */
#include <linux/debugfs.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/seq_file.h>

#include <asm/fixmap.h>
#include <asm/memory.h>
#include <asm/pgtable.h>
#include <asm/pgtable-hwdef.h>

struct addr_marker {
	unsigned long start_address;
	const char *name;
};

enum address_markers_idx {
	MODULES_START_NR = 0,
	MODULES_END_NR,
	VMALLOC_START_NR,
	VMALLOC_END_NR,
	FIXADDR_START_NR,
	FIXADDR_END_NR,
	PCI_START_NR,
	PCI_END_NR,
#ifdef CONFIG_SPARSEMEM_VMEMMAP
	VMEMMAP_START_NR,
	VMEMMAP_END_NR,
#endif
	KERNEL_SPACE_NR,
};

static struct addr_marker address_markers[] = {
	{ MODULES_VADDR,	"Modules start" },
	{ MODULES_END,		"Modules end" },
	{ VMALLOC_START,	"vmalloc() Area" },
	{ VMALLOC_END,		"vmalloc() End" },
	{ FIXADDR_START,	"Fixmap start" },
	{ FIXADDR_TOP,		"Fixmap end" },
	{ PCI_IO_START,		"PCI I/O start" },
	{ PCI_IO_END,		"PCI I/O end" },
#ifdef CONFIG_SPARSEMEM_VMEMMAP
	{ 0,			"vmemmap start" },
	{ 0,			"vmemmap end" },
#endif
	{ PAGE_OFFSET,		"Linear Mapping" },
	{ -1,			NULL },
};

/*
 * The page dumper groups page table entries of the same type into a single
 * description. It uses pg_state to track the range information while
 * iterating over the pte entries. When the continuity is broken it then
 * dumps out a description of the range.
 */
struct pg_state {
	struct seq_file *seq;
	const struct addr_marker *marker;
	unsigned long start_address;
	unsigned level;
	u64 current_prot;
};

struct prot_bits {
	u64		mask;
	u64		val;
	const char	*set;
	const char	*clear;
};

static const struct prot_bits pte_bits[] = {
	{
		.mask	= PTE_VALID,
		.val	= PTE_VALID,
		.set	= " ",
		.clear	= "F",
	}, {
		.mask	= PTE_USER,
		.val	= PTE_USER,
		.set	= "USR",
		.clear	= "   ",
	}, {
		.mask	= PTE_RDONLY,
		.val	= PTE_RDONLY,
		.set	= "ro",
		.clear	= "RW",
	}, {
		.mask	= PTE_PXN,
		.val	= PTE_PXN,
		.set	= "NX",
		.clear	= "x ",
	}, {
		.mask	= PTE_SHARED,
		.val	= PTE_SHARED,
		.set	= "SHD",
		.clear	= "   ",
	}, {
		.mask	= PTE_AF,
		.val	= PTE_AF,
		.set	= "AF",
		.clear	= "  ",
	}, {
		.mask	= PTE_NG,
		.val	= PTE_NG,
		.set	= "NG",
		.clear	= "  ",
	}, {
		.mask	= PTE_CONT,
		.val	= PTE_CONT,
		.set	= "CON",
		.clear	= "   ",
	}, {
		.mask	= PTE_TABLE_BIT,
		.val	= PTE_TABLE_BIT,
		.set	= "   ",
		.clear	= "BLK",
	}, {
		.mask	= PTE_UXN,
		.val	= PTE_UXN,
		.set	= "UXN",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_DEVICE_nGnRnE),
		.set	= "DEVICE/nGnRnE",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_DEVICE_nGnRE),
		.set	= "DEVICE/nGnRE",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_DEVICE_GRE),
		.set	= "DEVICE/GRE",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_NORMAL_NC),
		.set	= "MEM/NORMAL-NC",
	}, {
		.mask	= PTE_ATTRINDX_MASK,
		.val	= PTE_ATTRINDX(MT_NORMAL),
		.set	= "MEM/NORMAL",
	}
};

struct pg_level {
	const struct prot_bits *bits;
	size_t num;
	u64 mask;
};

static struct pg_level pg_level[] = {
	{
	}, { /* pgd */
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	}, { /* pud */
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	}, { /* pmd */
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	}, { /* pte */
		.bits	= pte_bits,
		.num	= ARRAY_SIZE(pte_bits),
	},
};

static void dump_prot(struct pg_state *st, const struct prot_bits *bits,
			size_t num)
{
	unsigned i;

	for (i = 0; i < num; i++, bits++) {
		const char *s;

		if ((st->current_prot & bits->mask) == bits->val)
			s = bits->set;
		else
			s = bits->clear;

		if (s)
			seq_printf(st->seq, " %s", s);
	}
}

static void note_page(struct pg_state *st, unsigned long addr, unsigned level,
				u64 val)
{
	static const char units[] = "KMGTPE";
	u64 prot = val & pg_level[level].mask;

	if (!st->level) {
		st->level = level;
		st->current_prot = prot;
		st->start_address = addr;
		seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	} else if (prot != st->current_prot || level != st->level ||
		   addr >= st->marker[1].start_address) {
		const char *unit = units;
		unsigned long delta;

		if (st->current_prot) {
			seq_printf(st->seq, "0x%016lx-0x%016lx   ",
				   st->start_address, addr);

			delta = (addr - st->start_address) >> 10;
			while (!(delta & 1023) && unit[1]) {
				delta >>= 10;
				unit++;
			}
			seq_printf(st->seq, "%9lu%c", delta, *unit);
			if (pg_level[st->level].bits)
				dump_prot(st, pg_level[st->level].bits,
					  pg_level[st->level].num);
			seq_puts(st->seq, "\n");
		}

		if (addr >= st->marker[1].start_address) {
			st->marker++;
			seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
		}

		st->start_address = addr;
		st->current_prot = prot;
		st->level = level;
	}

	if (addr >= st->marker[1].start_address) {
		st->marker++;
		seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	}

}

static void walk_pte(struct pg_state *st, pmd_t *pmd, unsigned long start)
{
	pte_t *pte = pte_offset_kernel(pmd, 0);
	unsigned long addr;
	unsigned i;

	for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
		addr = start + i * PAGE_SIZE;
		note_page(st, addr, 4, pte_val(*pte));
	}
}

static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
{
	pmd_t *pmd = pmd_offset(pud, 0);
	unsigned long addr;
	unsigned i;

	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
		addr = start + i * PMD_SIZE;
		if (pmd_none(*pmd) || pmd_sect(*pmd)) {
			note_page(st, addr, 3, pmd_val(*pmd));
		} else {
			BUG_ON(pmd_bad(*pmd));
			walk_pte(st, pmd, addr);
		}
	}
}

static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
{
	pud_t *pud = pud_offset(pgd, 0);
	unsigned long addr;
	unsigned i;

	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
		addr = start + i * PUD_SIZE;
		if (pud_none(*pud) || pud_sect(*pud)) {
			note_page(st, addr, 2, pud_val(*pud));
		} else {
			BUG_ON(pud_bad(*pud));
			walk_pmd(st, pud, addr);
		}
	}
}

static void walk_pgd(struct pg_state *st, struct mm_struct *mm, unsigned long start)
{
	pgd_t *pgd = pgd_offset(mm, 0UL);
	unsigned i;
	unsigned long addr;

	for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
		addr = start + i * PGDIR_SIZE;
		if (pgd_none(*pgd)) {
			note_page(st, addr, 1, pgd_val(*pgd));
		} else {
			BUG_ON(pgd_bad(*pgd));
			walk_pud(st, pgd, addr);
		}
	}
}

static int ptdump_show(struct seq_file *m, void *v)
{
	struct pg_state st = {
		.seq = m,
		.marker = address_markers,
	};

	walk_pgd(&st, &init_mm, VA_START);

	note_page(&st, 0, 0, 0);
	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++)
		if (pg_level[i].bits)
			for (j = 0; j < pg_level[i].num; j++)
				pg_level[i].mask |= pg_level[i].bits[j].mask;

#ifdef CONFIG_SPARSEMEM_VMEMMAP
	address_markers[VMEMMAP_START_NR].start_address =
				(unsigned long)virt_to_page(PAGE_OFFSET);
	address_markers[VMEMMAP_END_NR].start_address =
				(unsigned long)virt_to_page(high_memory);
#endif

	pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
				 &ptdump_fops);
	return pe ? 0 : -ENOMEM;
}
device_initcall(ptdump_init);
Commit	Line	Data
c9465b4e LA	1	/*
	2	* Copyright (c) 2014, The Linux Foundation. All rights reserved.
	3	* Debug helper to dump the current kernel pagetables of the system
	4	* so that we can see what the various memory ranges are set to.
	5	*
	6	* Derived from x86 and arm implementation:
	7	* (C) Copyright 2008 Intel Corporation
	8	*
	9	* Author: Arjan van de Ven <arjan@linux.intel.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; version 2
	14	* of the License.
	15	*/
	16	#include <linux/debugfs.h>
764011ca	17	#include <linux/errno.h>
c9465b4e	18	#include <linux/fs.h>
284be285	19	#include <linux/io.h>
764011ca	20	#include <linux/init.h>
c9465b4e LA	21	#include <linux/mm.h>
	22	#include <linux/sched.h>
	23	#include <linux/seq_file.h>
	24
	25	#include <asm/fixmap.h>
764011ca	26	#include <asm/memory.h>
c9465b4e	27	#include <asm/pgtable.h>
764011ca	28	#include <asm/pgtable-hwdef.h>
c9465b4e	29
c9465b4e LA	30	struct addr_marker {
	31	unsigned long start_address;
	32	const char *name;
	33	};
	34
	35	enum address_markers_idx {
f9040773 AB	36	MODULES_START_NR = 0,
	37	MODULES_END_NR,
	38	VMALLOC_START_NR,
c9465b4e	39	VMALLOC_END_NR,
c9465b4e LA	40	FIXADDR_START_NR,
c9465b4e LA	41	FIXADDR_END_NR,
aa03c428 MR	42	PCI_START_NR,
aa03c428 MR	43	PCI_END_NR,
3e1907d5 AB	44	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	45	VMEMMAP_START_NR,
	46	VMEMMAP_END_NR,
	47	#endif
c9465b4e LA	48	KERNEL_SPACE_NR,
	49	};
	50
	51	static struct addr_marker address_markers[] = {
f9040773 AB	52	{ MODULES_VADDR, "Modules start" },
f9040773 AB	53	{ MODULES_END, "Modules end" },
c9465b4e LA	54	{ VMALLOC_START, "vmalloc() Area" },
c9465b4e LA	55	{ VMALLOC_END, "vmalloc() End" },
c9465b4e LA	56	{ FIXADDR_START, "Fixmap start" },
c9465b4e LA	57	{ FIXADDR_TOP, "Fixmap end" },
aa03c428 MR	58	{ PCI_IO_START, "PCI I/O start" },
aa03c428 MR	59	{ PCI_IO_END, "PCI I/O end" },
3e1907d5 AB	60	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	61	{ 0, "vmemmap start" },
	62	{ 0, "vmemmap end" },
	63	#endif
f9040773	64	{ PAGE_OFFSET, "Linear Mapping" },
c9465b4e LA	65	{ -1, NULL },
	66	};
	67
202e41a1 JL	68	/*
	69	* The page dumper groups page table entries of the same type into a single
	70	* description. It uses pg_state to track the range information while
	71	* iterating over the pte entries. When the continuity is broken it then
	72	* dumps out a description of the range.
	73	*/
c9465b4e LA	74	struct pg_state {
	75	struct seq_file *seq;
	76	const struct addr_marker *marker;
	77	unsigned long start_address;
	78	unsigned level;
	79	u64 current_prot;
	80	};
	81
	82	struct prot_bits {
	83	u64 mask;
	84	u64 val;
	85	const char *set;
	86	const char *clear;
	87	};
	88
	89	static const struct prot_bits pte_bits[] = {
	90	{
d7e9d594 LA	91	.mask = PTE_VALID,
	92	.val = PTE_VALID,
	93	.set = " ",
	94	.clear = "F",
	95	}, {
c9465b4e LA	96	.mask = PTE_USER,
	97	.val = PTE_USER,
	98	.set = "USR",
	99	.clear = " ",
	100	}, {
	101	.mask = PTE_RDONLY,
	102	.val = PTE_RDONLY,
	103	.set = "ro",
	104	.clear = "RW",
	105	}, {
	106	.mask = PTE_PXN,
	107	.val = PTE_PXN,
	108	.set = "NX",
	109	.clear = "x ",
	110	}, {
	111	.mask = PTE_SHARED,
	112	.val = PTE_SHARED,
	113	.set = "SHD",
	114	.clear = " ",
	115	}, {
	116	.mask = PTE_AF,
	117	.val = PTE_AF,
	118	.set = "AF",
	119	.clear = " ",
	120	}, {
	121	.mask = PTE_NG,
	122	.val = PTE_NG,
	123	.set = "NG",
	124	.clear = " ",
202e41a1 JL	125	}, {
	126	.mask = PTE_CONT,
	127	.val = PTE_CONT,
	128	.set = "CON",
	129	.clear = " ",
	130	}, {
	131	.mask = PTE_TABLE_BIT,
	132	.val = PTE_TABLE_BIT,
	133	.set = " ",
	134	.clear = "BLK",
c9465b4e LA	135	}, {
	136	.mask = PTE_UXN,
	137	.val = PTE_UXN,
	138	.set = "UXN",
	139	}, {
	140	.mask = PTE_ATTRINDX_MASK,
	141	.val = PTE_ATTRINDX(MT_DEVICE_nGnRnE),
	142	.set = "DEVICE/nGnRnE",
	143	}, {
	144	.mask = PTE_ATTRINDX_MASK,
	145	.val = PTE_ATTRINDX(MT_DEVICE_nGnRE),
	146	.set = "DEVICE/nGnRE",
	147	}, {
	148	.mask = PTE_ATTRINDX_MASK,
	149	.val = PTE_ATTRINDX(MT_DEVICE_GRE),
	150	.set = "DEVICE/GRE",
	151	}, {
	152	.mask = PTE_ATTRINDX_MASK,
	153	.val = PTE_ATTRINDX(MT_NORMAL_NC),
	154	.set = "MEM/NORMAL-NC",
	155	}, {
	156	.mask = PTE_ATTRINDX_MASK,
	157	.val = PTE_ATTRINDX(MT_NORMAL),
	158	.set = "MEM/NORMAL",
	159	}
	160	};
	161
	162	struct pg_level {
	163	const struct prot_bits *bits;
	164	size_t num;
	165	u64 mask;
	166	};
	167
	168	static struct pg_level pg_level[] = {
	169	{
	170	}, { /* pgd */
	171	.bits = pte_bits,
	172	.num = ARRAY_SIZE(pte_bits),
	173	}, { /* pud */
	174	.bits = pte_bits,
	175	.num = ARRAY_SIZE(pte_bits),
	176	}, { /* pmd */
	177	.bits = pte_bits,
	178	.num = ARRAY_SIZE(pte_bits),
	179	}, { /* pte */
	180	.bits = pte_bits,
	181	.num = ARRAY_SIZE(pte_bits),
	182	},
	183	};
	184
	185	static void dump_prot(struct pg_state st, const struct prot_bits bits,
	186	size_t num)
	187	{
	188	unsigned i;
	189
	190	for (i = 0; i < num; i++, bits++) {
	191	const char *s;
	192
	193	if ((st->current_prot & bits->mask) == bits->val)
	194	s = bits->set;
	195	else
	196	s = bits->clear;
	197
	198	if (s)
199	seq_printf(st->seq, " %s", s);
200	}
201	}
202
203	static void note_page(struct pg_state *st, unsigned long addr, unsigned level,
204	u64 val)
205	{
206	static const char units[] = "KMGTPE";
207	u64 prot = val & pg_level[level].mask;
208
c9465b4e LA	209	if (!st->level) {
	210	st->level = level;
	211	st->current_prot = prot;
	212	st->start_address = addr;
	213	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	214	} else if (prot != st->current_prot \|\| level != st->level \|\|
	215	addr >= st->marker[1].start_address) {
	216	const char *unit = units;
	217	unsigned long delta;
	218
	219	if (st->current_prot) {
202e41a1	220	seq_printf(st->seq, "0x%016lx-0x%016lx ",
c9465b4e LA	221	st->start_address, addr);
	222
	223	delta = (addr - st->start_address) >> 10;
	224	while (!(delta & 1023) && unit[1]) {
	225	delta >>= 10;
	226	unit++;
	227	}
	228	seq_printf(st->seq, "%9lu%c", delta, *unit);
	229	if (pg_level[st->level].bits)
	230	dump_prot(st, pg_level[st->level].bits,
	231	pg_level[st->level].num);
	232	seq_puts(st->seq, "\n");
	233	}
	234
	235	if (addr >= st->marker[1].start_address) {
	236	st->marker++;
	237	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	238	}
	239
	240	st->start_address = addr;
	241	st->current_prot = prot;
	242	st->level = level;
	243	}
	244
	245	if (addr >= st->marker[1].start_address) {
	246	st->marker++;
	247	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	248	}
	249
	250	}
	251
	252	static void walk_pte(struct pg_state st, pmd_t pmd, unsigned long start)
	253	{
	254	pte_t *pte = pte_offset_kernel(pmd, 0);
	255	unsigned long addr;
	256	unsigned i;
	257
	258	for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
	259	addr = start + i * PAGE_SIZE;
	260	note_page(st, addr, 4, pte_val(*pte));
	261	}
	262	}
	263
	264	static void walk_pmd(struct pg_state st, pud_t pud, unsigned long start)
	265	{
	266	pmd_t *pmd = pmd_offset(pud, 0);
	267	unsigned long addr;
	268	unsigned i;
	269
	270	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
	271	addr = start + i * PMD_SIZE;
a1c76574	272	if (pmd_none(pmd) \|\| pmd_sect(pmd)) {
c9465b4e	273	note_page(st, addr, 3, pmd_val(*pmd));
a1c76574 MR	274	} else {
a1c76574 MR	275	BUG_ON(pmd_bad(*pmd));
c9465b4e	276	walk_pte(st, pmd, addr);
a1c76574	277	}
c9465b4e LA	278	}
	279	}
	280
	281	static void walk_pud(struct pg_state st, pgd_t pgd, unsigned long start)
	282	{
	283	pud_t *pud = pud_offset(pgd, 0);
	284	unsigned long addr;
	285	unsigned i;
	286
	287	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
	288	addr = start + i * PUD_SIZE;
a1c76574	289	if (pud_none(pud) \|\| pud_sect(pud)) {
c9465b4e	290	note_page(st, addr, 2, pud_val(*pud));
a1c76574 MR	291	} else {
a1c76574 MR	292	BUG_ON(pud_bad(*pud));
c9465b4e	293	walk_pmd(st, pud, addr);
a1c76574	294	}
c9465b4e LA	295	}
	296	}
	297
	298	static void walk_pgd(struct pg_state st, struct mm_struct mm, unsigned long start)
	299	{
35545f0c	300	pgd_t *pgd = pgd_offset(mm, 0UL);
c9465b4e LA	301	unsigned i;
	302	unsigned long addr;
	303
	304	for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
	305	addr = start + i * PGDIR_SIZE;
a1c76574	306	if (pgd_none(*pgd)) {
c9465b4e	307	note_page(st, addr, 1, pgd_val(*pgd));
a1c76574 MR	308	} else {
a1c76574 MR	309	BUG_ON(pgd_bad(*pgd));
c9465b4e	310	walk_pud(st, pgd, addr);
a1c76574	311	}
c9465b4e LA	312	}
	313	}
	314
	315	static int ptdump_show(struct seq_file m, void v)
	316	{
	317	struct pg_state st = {
	318	.seq = m,
	319	.marker = address_markers,
	320	};
	321
cc30e6b9	322	walk_pgd(&st, &init_mm, VA_START);
c9465b4e LA	323
	324	note_page(&st, 0, 0, 0);
	325	return 0;
	326	}
	327
	328	static int ptdump_open(struct inode inode, struct file file)
	329	{
	330	return single_open(file, ptdump_show, NULL);
	331	}
	332
	333	static const struct file_operations ptdump_fops = {
	334	.open = ptdump_open,
	335	.read = seq_read,
	336	.llseek = seq_lseek,
	337	.release = single_release,
	338	};
	339
	340	static int ptdump_init(void)
	341	{
	342	struct dentry *pe;
	343	unsigned i, j;
	344
	345	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
	346	if (pg_level[i].bits)
	347	for (j = 0; j < pg_level[i].num; j++)
	348	pg_level[i].mask \|= pg_level[i].bits[j].mask;
	349
326a7803	350	#ifdef CONFIG_SPARSEMEM_VMEMMAP
c9465b4e LA	351	address_markers[VMEMMAP_START_NR].start_address =
	352	(unsigned long)virt_to_page(PAGE_OFFSET);
	353	address_markers[VMEMMAP_END_NR].start_address =
	354	(unsigned long)virt_to_page(high_memory);
326a7803	355	#endif
c9465b4e LA	356
	357	pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
	358	&ptdump_fops);
	359	return pe ? 0 : -ENOMEM;
	360	}
	361	device_initcall(ptdump_init);