powerpc: Move page table dump files in a dedicated subdirectory

This patch moves the files related to page table dump in a
dedicated subdirectory.

The purpose is to clean a bit arch/powerpc/mm by regrouping
multiple files handling a dedicated function.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Shorten the file names while we're at it]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 0 insertions, 379 deletions

diff --git a/arch/powerpc/mm/dump_linuxpagetables.c b/arch/powerpc/mm/dump_linuxpagetables.c
deleted file mode 100644
index b0da447197d4..000000000000
--- a/arch/powerpc/mm/dump_linuxpagetables.c
+++ /dev/null
@@ -1,379 +0,0 @@
-/*
- * Copyright 2016, Rashmica Gupta, IBM Corp.
- *
- * This traverses the kernel pagetables and dumps the
- * information about the used sections of memory to
- * /sys/kernel/debug/kernel_pagetables.
- *
- * Derived from the arm64 implementation:
- * Copyright (c) 2014, The Linux Foundation, Laura Abbott.
- * (C) Copyright 2008 Intel Corporation, Arjan van de Ven.
- *
- * 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/fs.h>
-#include <linux/hugetlb.h>
-#include <linux/io.h>
-#include <linux/mm.h>
-#include <linux/highmem.h>
-#include <linux/sched.h>
-#include <linux/seq_file.h>
-#include <asm/fixmap.h>
-#include <asm/pgtable.h>
-#include <linux/const.h>
-#include <asm/page.h>
-#include <asm/pgalloc.h>
-
-#include "dump_linuxpagetables.h"
-
-#ifdef CONFIG_PPC32
-#define KERN_VIRT_START	0
-#endif
-
-/*
- * To visualise what is happening,
- *
- *  - PTRS_PER_P** = how many entries there are in the corresponding P**
- *  - P**_SHIFT = how many bits of the address we use to index into the
- * corresponding P**
- *  - P**_SIZE is how much memory we can access through the table - not the
- * size of the table itself.
- * P**={PGD, PUD, PMD, PTE}
- *
- *
- * Each entry of the PGD points to a PUD. Each entry of a PUD points to a
- * PMD. Each entry of a PMD points to a PTE. And every PTE entry points to
- * a page.
- *
- * In the case where there are only 3 levels, the PUD is folded into the
- * PGD: every PUD has only one entry which points to the PMD.
- *
- * 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 - ie PTEs that are virtually contiguous
- * with the same PTE flags are chunked together. This is to make it clear how
- * different areas of the kernel virtual memory are used.
- *
- */
-struct pg_state {
-	struct seq_file *seq;
-	const struct addr_marker *marker;
-	unsigned long start_address;
-	unsigned long start_pa;
-	unsigned long last_pa;
-	unsigned int level;
-	u64 current_flags;
-};
-
-struct addr_marker {
-	unsigned long start_address;
-	const char *name;
-};
-
-static struct addr_marker address_markers[] = {
-	{ 0,	"Start of kernel VM" },
-	{ 0,	"vmalloc() Area" },
-	{ 0,	"vmalloc() End" },
-#ifdef CONFIG_PPC64
-	{ 0,	"isa I/O start" },
-	{ 0,	"isa I/O end" },
-	{ 0,	"phb I/O start" },
-	{ 0,	"phb I/O end" },
-	{ 0,	"I/O remap start" },
-	{ 0,	"I/O remap end" },
-	{ 0,	"vmemmap start" },
-#else
-	{ 0,	"Early I/O remap start" },
-	{ 0,	"Early I/O remap end" },
-#ifdef CONFIG_NOT_COHERENT_CACHE
-	{ 0,	"Consistent mem start" },
-	{ 0,	"Consistent mem end" },
-#endif
-#ifdef CONFIG_HIGHMEM
-	{ 0,	"Highmem PTEs start" },
-	{ 0,	"Highmem PTEs end" },
-#endif
-	{ 0,	"Fixmap start" },
-	{ 0,	"Fixmap end" },
-#endif
-	{ -1,	NULL },
-};
-
-static void dump_flag_info(struct pg_state *st, const struct flag_info
-		*flag, u64 pte, int num)
-{
-	unsigned int i;
-
-	for (i = 0; i < num; i++, flag++) {
-		const char *s = NULL;
-		u64 val;
-
-		/* flag not defined so don't check it */
-		if (flag->mask == 0)
-			continue;
-		/* Some 'flags' are actually values */
-		if (flag->is_val) {
-			val = pte & flag->val;
-			if (flag->shift)
-				val = val >> flag->shift;
-			seq_printf(st->seq, "  %s:%llx", flag->set, val);
-		} else {
-			if ((pte & flag->mask) == flag->val)
-				s = flag->set;
-			else
-				s = flag->clear;
-			if (s)
-				seq_printf(st->seq, "  %s", s);
-		}
-		st->current_flags &= ~flag->mask;
-	}
-	if (st->current_flags != 0)
-		seq_printf(st->seq, "  unknown flags:%llx", st->current_flags);
-}
-
-static void dump_addr(struct pg_state *st, unsigned long addr)
-{
-	static const char units[] = "KMGTPE";
-	const char *unit = units;
-	unsigned long delta;
-
-#ifdef CONFIG_PPC64
-#define REG		"0x%016lx"
-#else
-#define REG		"0x%08lx"
-#endif
-
-	seq_printf(st->seq, REG "-" REG " ", st->start_address, addr - 1);
-	if (st->start_pa == st->last_pa && st->start_address + PAGE_SIZE != addr) {
-		seq_printf(st->seq, "[" REG "]", st->start_pa);
-		delta = PAGE_SIZE >> 10;
-	} else {
-		seq_printf(st->seq, " " REG " ", st->start_pa);
-		delta = (addr - st->start_address) >> 10;
-	}
-	/* Work out what appropriate unit to use */
-	while (!(delta & 1023) && unit[1]) {
-		delta >>= 10;
-		unit++;
-	}
-	seq_printf(st->seq, "%9lu%c", delta, *unit);
-
-}
-
-static void note_page(struct pg_state *st, unsigned long addr,
-	       unsigned int level, u64 val)
-{
-	u64 flag = val & pg_level[level].mask;
-	u64 pa = val & PTE_RPN_MASK;
-
-	/* At first no level is set */
-	if (!st->level) {
-		st->level = level;
-		st->current_flags = flag;
-		st->start_address = addr;
-		st->start_pa = pa;
-		st->last_pa = pa;
-		seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
-	/*
-	 * Dump the section of virtual memory when:
-	 *   - the PTE flags from one entry to the next differs.
-	 *   - we change levels in the tree.
-	 *   - the address is in a different section of memory and is thus
-	 *   used for a different purpose, regardless of the flags.
-	 *   - the pa of this page is not adjacent to the last inspected page
-	 */
-	} else if (flag != st->current_flags || level != st->level ||
-		   addr >= st->marker[1].start_address ||
-		   (pa != st->last_pa + PAGE_SIZE &&
-		    (pa != st->start_pa || st->start_pa != st->last_pa))) {
-
-		/* Check the PTE flags */
-		if (st->current_flags) {
-			dump_addr(st, addr);
-
-			/* Dump all the flags */
-			if (pg_level[st->level].flag)
-				dump_flag_info(st, pg_level[st->level].flag,
-					  st->current_flags,
-					  pg_level[st->level].num);
-
-			seq_putc(st->seq, '\n');
-		}
-
-		/*
-		 * Address indicates we have passed the end of the
-		 * current section of virtual memory
-		 */
-		while (addr >= st->marker[1].start_address) {
-			st->marker++;
-			seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
-		}
-		st->start_address = addr;
-		st->start_pa = pa;
-		st->last_pa = pa;
-		st->current_flags = flag;
-		st->level = level;
-	} else {
-		st->last_pa = pa;
-	}
-}
-
-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 int 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 int i;
-
-	for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
-		addr = start + i * PMD_SIZE;
-		if (!pmd_none(*pmd) && !pmd_huge(*pmd))
-			/* pmd exists */
-			walk_pte(st, pmd, addr);
-		else
-			note_page(st, addr, 3, pmd_val(*pmd));
-	}
-}
-
-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 int i;
-
-	for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
-		addr = start + i * PUD_SIZE;
-		if (!pud_none(*pud) && !pud_huge(*pud))
-			/* pud exists */
-			walk_pmd(st, pud, addr);
-		else
-			note_page(st, addr, 2, pud_val(*pud));
-	}
-}
-
-static void walk_pagetables(struct pg_state *st)
-{
-	pgd_t *pgd = pgd_offset_k(0UL);
-	unsigned int i;
-	unsigned long addr;
-
-	addr = st->start_address;
-
-	/*
-	 * Traverse the linux pagetable structure and dump pages that are in
-	 * the hash pagetable.
-	 */
-	for (i = 0; i < PTRS_PER_PGD; i++, pgd++, addr += PGDIR_SIZE) {
-		if (!pgd_none(*pgd) && !pgd_huge(*pgd))
-			/* pgd exists */
-			walk_pud(st, pgd, addr);
-		else
-			note_page(st, addr, 1, pgd_val(*pgd));
-	}
-}
-
-static void populate_markers(void)
-{
-	int i = 0;
-
-	address_markers[i++].start_address = PAGE_OFFSET;
-	address_markers[i++].start_address = VMALLOC_START;
-	address_markers[i++].start_address = VMALLOC_END;
-#ifdef CONFIG_PPC64
-	address_markers[i++].start_address = ISA_IO_BASE;
-	address_markers[i++].start_address = ISA_IO_END;
-	address_markers[i++].start_address = PHB_IO_BASE;
-	address_markers[i++].start_address = PHB_IO_END;
-	address_markers[i++].start_address = IOREMAP_BASE;
-	address_markers[i++].start_address = IOREMAP_END;
-#ifdef CONFIG_PPC_BOOK3S_64
-	address_markers[i++].start_address =  H_VMEMMAP_BASE;
-#else
-	address_markers[i++].start_address =  VMEMMAP_BASE;
-#endif
-#else /* !CONFIG_PPC64 */
-	address_markers[i++].start_address = ioremap_bot;
-	address_markers[i++].start_address = IOREMAP_TOP;
-#ifdef CONFIG_NOT_COHERENT_CACHE
-	address_markers[i++].start_address = IOREMAP_TOP;
-	address_markers[i++].start_address = IOREMAP_TOP +
-					     CONFIG_CONSISTENT_SIZE;
-#endif
-#ifdef CONFIG_HIGHMEM
-	address_markers[i++].start_address = PKMAP_BASE;
-	address_markers[i++].start_address = PKMAP_ADDR(LAST_PKMAP);
-#endif
-	address_markers[i++].start_address = FIXADDR_START;
-	address_markers[i++].start_address = FIXADDR_TOP;
-#endif /* CONFIG_PPC64 */
-}
-
-static int ptdump_show(struct seq_file *m, void *v)
-{
-	struct pg_state st = {
-		.seq = m,
-		.marker = address_markers,
-	};
-
-	if (radix_enabled())
-		st.start_address = PAGE_OFFSET;
-	else
-		st.start_address = KERN_VIRT_START;
-
-	/* Traverse kernel page tables */
-	walk_pagetables(&st);
-	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 void build_pgtable_complete_mask(void)
-{
-	unsigned int i, j;
-
-	for (i = 0; i < ARRAY_SIZE(pg_level); i++)
-		if (pg_level[i].flag)
-			for (j = 0; j < pg_level[i].num; j++)
-				pg_level[i].mask |= pg_level[i].flag[j].mask;
-}
-
-static int ptdump_init(void)
-{
-	struct dentry *debugfs_file;
-
-	populate_markers();
-	build_pgtable_complete_mask();
-	debugfs_file = debugfs_create_file("kernel_page_tables", 0400, NULL,
-			NULL, &ptdump_fops);
-	return debugfs_file ? 0 : -ENOMEM;
-}
-device_initcall(ptdump_init);