[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/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>

#define LOWEST_ADDR	(UL(0xffffffffffffffff) << VA_BITS)

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

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

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

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_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_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%16lx-0x%16lx   ",
				   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) || pmd_bad(*pmd))
			note_page(st, addr, 3, pmd_val(*pmd));
		else
			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) || pud_bad(*pud))
			note_page(st, addr, 2, pud_val(*pud));
		else
			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) || pgd_bad(*pgd))
			note_page(st, addr, 1, pgd_val(*pgd));
		else
			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, LOWEST_ADDR);

	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;

	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);

	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>
764011ca	19	#include <linux/init.h>
c9465b4e LA	20	#include <linux/mm.h>
	21	#include <linux/sched.h>
	22	#include <linux/seq_file.h>
	23
	24	#include <asm/fixmap.h>
764011ca	25	#include <asm/memory.h>
c9465b4e	26	#include <asm/pgtable.h>
764011ca	27	#include <asm/pgtable-hwdef.h>
c9465b4e LA	28
	29	#define LOWEST_ADDR (UL(0xffffffffffffffff) << VA_BITS)
	30
	31	struct addr_marker {
	32	unsigned long start_address;
	33	const char *name;
	34	};
	35
	36	enum address_markers_idx {
	37	VMALLOC_START_NR = 0,
	38	VMALLOC_END_NR,
	39	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	40	VMEMMAP_START_NR,
	41	VMEMMAP_END_NR,
	42	#endif
c9465b4e LA	43	FIXADDR_START_NR,
c9465b4e LA	44	FIXADDR_END_NR,
aa03c428 MR	45	PCI_START_NR,
aa03c428 MR	46	PCI_END_NR,
c9465b4e LA	47	MODULES_START_NR,
	48	MODUELS_END_NR,
	49	KERNEL_SPACE_NR,
	50	};
	51
	52	static struct addr_marker address_markers[] = {
	53	{ VMALLOC_START, "vmalloc() Area" },
	54	{ VMALLOC_END, "vmalloc() End" },
	55	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	56	{ 0, "vmemmap start" },
	57	{ 0, "vmemmap end" },
	58	#endif
c9465b4e LA	59	{ FIXADDR_START, "Fixmap start" },
c9465b4e LA	60	{ FIXADDR_TOP, "Fixmap end" },
aa03c428 MR	61	{ PCI_IO_START, "PCI I/O start" },
aa03c428 MR	62	{ PCI_IO_END, "PCI I/O end" },
c9465b4e LA	63	{ MODULES_VADDR, "Modules start" },
	64	{ MODULES_END, "Modules end" },
	65	{ PAGE_OFFSET, "Kernel Mapping" },
	66	{ -1, NULL },
	67	};
	68
	69	struct pg_state {
	70	struct seq_file *seq;
	71	const struct addr_marker *marker;
	72	unsigned long start_address;
	73	unsigned level;
	74	u64 current_prot;
	75	};
	76
	77	struct prot_bits {
	78	u64 mask;
	79	u64 val;
	80	const char *set;
	81	const char *clear;
	82	};
	83
	84	static const struct prot_bits pte_bits[] = {
	85	{
	86	.mask = PTE_USER,
	87	.val = PTE_USER,
	88	.set = "USR",
	89	.clear = " ",
	90	}, {
	91	.mask = PTE_RDONLY,
	92	.val = PTE_RDONLY,
	93	.set = "ro",
	94	.clear = "RW",
	95	}, {
	96	.mask = PTE_PXN,
	97	.val = PTE_PXN,
	98	.set = "NX",
	99	.clear = "x ",
	100	}, {
	101	.mask = PTE_SHARED,
	102	.val = PTE_SHARED,
	103	.set = "SHD",
	104	.clear = " ",
	105	}, {
	106	.mask = PTE_AF,
	107	.val = PTE_AF,
	108	.set = "AF",
	109	.clear = " ",
	110	}, {
	111	.mask = PTE_NG,
	112	.val = PTE_NG,
	113	.set = "NG",
	114	.clear = " ",
	115	}, {
	116	.mask = PTE_UXN,
	117	.val = PTE_UXN,
	118	.set = "UXN",
	119	}, {
	120	.mask = PTE_ATTRINDX_MASK,
	121	.val = PTE_ATTRINDX(MT_DEVICE_nGnRnE),
	122	.set = "DEVICE/nGnRnE",
	123	}, {
	124	.mask = PTE_ATTRINDX_MASK,
	125	.val = PTE_ATTRINDX(MT_DEVICE_nGnRE),
	126	.set = "DEVICE/nGnRE",
127	}, {
128	.mask = PTE_ATTRINDX_MASK,
129	.val = PTE_ATTRINDX(MT_DEVICE_GRE),
130	.set = "DEVICE/GRE",
131	}, {
132	.mask = PTE_ATTRINDX_MASK,
133	.val = PTE_ATTRINDX(MT_NORMAL_NC),
134	.set = "MEM/NORMAL-NC",
135	}, {
136	.mask = PTE_ATTRINDX_MASK,
137	.val = PTE_ATTRINDX(MT_NORMAL),
138	.set = "MEM/NORMAL",
139	}
140	};
141
142	struct pg_level {
143	const struct prot_bits *bits;
144	size_t num;
145	u64 mask;
146	};
147
148	static struct pg_level pg_level[] = {
149	{
150	}, { /* pgd */
151	.bits = pte_bits,
152	.num = ARRAY_SIZE(pte_bits),
153	}, { /* pud */
154	.bits = pte_bits,
155	.num = ARRAY_SIZE(pte_bits),
156	}, { /* pmd */
157	.bits = pte_bits,
158	.num = ARRAY_SIZE(pte_bits),
159	}, { /* pte */
160	.bits = pte_bits,
161	.num = ARRAY_SIZE(pte_bits),
162	},
163	};
164
165	static void dump_prot(struct pg_state st, const struct prot_bits bits,
166	size_t num)
167	{
168	unsigned i;
169
170	for (i = 0; i < num; i++, bits++) {
171	const char *s;
172
173	if ((st->current_prot & bits->mask) == bits->val)
174	s = bits->set;
175	else
176	s = bits->clear;
177
178	if (s)
179	seq_printf(st->seq, " %s", s);
180	}
181	}
182
183	static void note_page(struct pg_state *st, unsigned long addr, unsigned level,
184	u64 val)
185	{
186	static const char units[] = "KMGTPE";
187	u64 prot = val & pg_level[level].mask;
188
c9465b4e LA	189	if (!st->level) {
	190	st->level = level;
	191	st->current_prot = prot;
	192	st->start_address = addr;
	193	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	194	} else if (prot != st->current_prot \|\| level != st->level \|\|
	195	addr >= st->marker[1].start_address) {
	196	const char *unit = units;
	197	unsigned long delta;
	198
	199	if (st->current_prot) {
	200	seq_printf(st->seq, "0x%16lx-0x%16lx ",
	201	st->start_address, addr);
	202
	203	delta = (addr - st->start_address) >> 10;
	204	while (!(delta & 1023) && unit[1]) {
	205	delta >>= 10;
	206	unit++;
	207	}
	208	seq_printf(st->seq, "%9lu%c", delta, *unit);
	209	if (pg_level[st->level].bits)
	210	dump_prot(st, pg_level[st->level].bits,
	211	pg_level[st->level].num);
	212	seq_puts(st->seq, "\n");
	213	}
	214
	215	if (addr >= st->marker[1].start_address) {
	216	st->marker++;
	217	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	218	}
	219
	220	st->start_address = addr;
	221	st->current_prot = prot;
	222	st->level = level;
	223	}
	224
	225	if (addr >= st->marker[1].start_address) {
	226	st->marker++;
	227	seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
	228	}
	229
	230	}
	231
	232	static void walk_pte(struct pg_state st, pmd_t pmd, unsigned long start)
	233	{
	234	pte_t *pte = pte_offset_kernel(pmd, 0);
	235	unsigned long addr;
	236	unsigned i;
	237
	238	for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
	239	addr = start + i * PAGE_SIZE;
	240	note_page(st, addr, 4, pte_val(*pte));
	241	}
	242	}
	243
	244	static void walk_pmd(struct pg_state st, pud_t pud, unsigned long start)
	245	{
	246	pmd_t *pmd = pmd_offset(pud, 0);
	247	unsigned long addr;
	248	unsigned i;
	249
	250	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
	251	addr = start + i * PMD_SIZE;
	252	if (pmd_none(pmd) \|\| pmd_sect(pmd) \|\| pmd_bad(*pmd))
253	note_page(st, addr, 3, pmd_val(*pmd));
254	else
255	walk_pte(st, pmd, addr);
256	}
257	}
258
259	static void walk_pud(struct pg_state st, pgd_t pgd, unsigned long start)
260	{
261	pud_t *pud = pud_offset(pgd, 0);
262	unsigned long addr;
263	unsigned i;
264
265	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
266	addr = start + i * PUD_SIZE;
267	if (pud_none(pud) \|\| pud_sect(pud) \|\| pud_bad(*pud))
268	note_page(st, addr, 2, pud_val(*pud));
269	else
270	walk_pmd(st, pud, addr);
271	}
272	}
273
274	static void walk_pgd(struct pg_state st, struct mm_struct mm, unsigned long start)
275	{
35545f0c	276	pgd_t *pgd = pgd_offset(mm, 0UL);
c9465b4e LA	277	unsigned i;
	278	unsigned long addr;
	279
	280	for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
	281	addr = start + i * PGDIR_SIZE;
	282	if (pgd_none(pgd) \|\| pgd_bad(pgd))
	283	note_page(st, addr, 1, pgd_val(*pgd));
	284	else
	285	walk_pud(st, pgd, addr);
	286	}
	287	}
	288
	289	static int ptdump_show(struct seq_file m, void v)
	290	{
	291	struct pg_state st = {
	292	.seq = m,
	293	.marker = address_markers,
	294	};
	295
	296	walk_pgd(&st, &init_mm, LOWEST_ADDR);
	297
	298	note_page(&st, 0, 0, 0);
	299	return 0;
	300	}
	301
	302	static int ptdump_open(struct inode inode, struct file file)
	303	{
	304	return single_open(file, ptdump_show, NULL);
	305	}
	306
	307	static const struct file_operations ptdump_fops = {
	308	.open = ptdump_open,
	309	.read = seq_read,
	310	.llseek = seq_lseek,
	311	.release = single_release,
	312	};
	313
	314	static int ptdump_init(void)
	315	{
	316	struct dentry *pe;
	317	unsigned i, j;
	318
	319	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
	320	if (pg_level[i].bits)
	321	for (j = 0; j < pg_level[i].num; j++)
	322	pg_level[i].mask \|= pg_level[i].bits[j].mask;
	323
	324	address_markers[VMEMMAP_START_NR].start_address =
	325	(unsigned long)virt_to_page(PAGE_OFFSET);
	326	address_markers[VMEMMAP_END_NR].start_address =
	327	(unsigned long)virt_to_page(high_memory);
	328
	329	pe = debugfs_create_file("kernel_page_tables", 0400, NULL, NULL,
	330	&ptdump_fops);
	331	return pe ? 0 : -ENOMEM;
	332	}
	333	device_initcall(ptdump_init);