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-rw-r--r--arch/powerpc/mm/dump_linuxpagetables.c113
1 files changed, 96 insertions, 17 deletions
diff --git a/arch/powerpc/mm/dump_linuxpagetables.c b/arch/powerpc/mm/dump_linuxpagetables.c
index 49abaf4dc8e3..44fe4833910f 100644
--- a/arch/powerpc/mm/dump_linuxpagetables.c
+++ b/arch/powerpc/mm/dump_linuxpagetables.c
@@ -16,6 +16,7 @@
*/
#include <linux/debugfs.h>
#include <linux/fs.h>
+#include <linux/hugetlb.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/sched.h>
@@ -26,6 +27,10 @@
#include <asm/page.h>
#include <asm/pgalloc.h>
+#ifdef CONFIG_PPC32
+#define KERN_VIRT_START 0
+#endif
+
/*
* To visualise what is happening,
*
@@ -56,6 +61,8 @@ 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;
};
@@ -69,6 +76,7 @@ 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" },
@@ -76,6 +84,20 @@ static struct addr_marker address_markers[] = {
{ 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 },
};
@@ -100,8 +122,13 @@ static const struct flag_info flag_array[] = {
.set = "user",
.clear = " ",
}, {
+#if _PAGE_RO == 0
.mask = _PAGE_RW,
.val = _PAGE_RW,
+#else
+ .mask = _PAGE_RO,
+ .val = 0,
+#endif
.set = "rw",
.clear = "ro",
}, {
@@ -154,11 +181,24 @@ static const struct flag_info flag_array[] = {
.clear = " ",
}, {
#endif
+#ifndef CONFIG_PPC_BOOK3S_64
.mask = _PAGE_NO_CACHE,
.val = _PAGE_NO_CACHE,
.set = "no cache",
.clear = " ",
}, {
+#else
+ .mask = _PAGE_NON_IDEMPOTENT,
+ .val = _PAGE_NON_IDEMPOTENT,
+ .set = "non-idempotent",
+ .clear = " ",
+ }, {
+ .mask = _PAGE_TOLERANT,
+ .val = _PAGE_TOLERANT,
+ .set = "tolerant",
+ .clear = " ",
+ }, {
+#endif
#ifdef CONFIG_PPC_BOOK3S_64
.mask = H_PAGE_BUSY,
.val = H_PAGE_BUSY,
@@ -188,6 +228,10 @@ static const struct flag_info flag_array[] = {
.mask = _PAGE_SPECIAL,
.val = _PAGE_SPECIAL,
.set = "special",
+ }, {
+ .mask = _PAGE_SHARED,
+ .val = _PAGE_SHARED,
+ .set = "shared",
}
};
@@ -252,7 +296,14 @@ static void dump_addr(struct pg_state *st, unsigned long addr)
const char *unit = units;
unsigned long delta;
- seq_printf(st->seq, "0x%016lx-0x%016lx ", st->start_address, addr-1);
+#ifdef CONFIG_PPC64
+ seq_printf(st->seq, "0x%016lx-0x%016lx ", st->start_address, addr-1);
+ seq_printf(st->seq, "0x%016lx ", st->start_pa);
+#else
+ seq_printf(st->seq, "0x%08lx-0x%08lx ", st->start_address, addr - 1);
+ seq_printf(st->seq, "0x%08lx ", st->start_pa);
+#endif
+
delta = (addr - st->start_address) >> 10;
/* Work out what appropriate unit to use */
while (!(delta & 1023) && unit[1]) {
@@ -267,11 +318,15 @@ 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:
@@ -279,9 +334,11 @@ static void note_page(struct pg_state *st, unsigned long addr,
* - 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) {
+ addr >= st->marker[1].start_address ||
+ pa != st->last_pa + PAGE_SIZE) {
/* Check the PTE flags */
if (st->current_flags) {
@@ -305,8 +362,12 @@ static void note_page(struct pg_state *st, unsigned long addr,
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;
}
}
@@ -331,7 +392,7 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
addr = start + i * PMD_SIZE;
- if (!pmd_none(*pmd))
+ if (!pmd_none(*pmd) && !pmd_huge(*pmd))
/* pmd exists */
walk_pte(st, pmd, addr);
else
@@ -347,7 +408,7 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
addr = start + i * PUD_SIZE;
- if (!pud_none(*pud))
+ if (!pud_none(*pud) && !pud_huge(*pud))
/* pud exists */
walk_pmd(st, pud, addr);
else
@@ -367,7 +428,7 @@ static void walk_pagetables(struct pg_state *st)
*/
for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
addr = KERN_VIRT_START + i * PGDIR_SIZE;
- if (!pgd_none(*pgd))
+ if (!pgd_none(*pgd) && !pgd_huge(*pgd))
/* pgd exists */
walk_pud(st, pgd, addr);
else
@@ -377,20 +438,38 @@ static void walk_pagetables(struct pg_state *st)
static void populate_markers(void)
{
- address_markers[0].start_address = PAGE_OFFSET;
- address_markers[1].start_address = VMALLOC_START;
- address_markers[2].start_address = VMALLOC_END;
- address_markers[3].start_address = ISA_IO_BASE;
- address_markers[4].start_address = ISA_IO_END;
- address_markers[5].start_address = PHB_IO_BASE;
- address_markers[6].start_address = PHB_IO_END;
- address_markers[7].start_address = IOREMAP_BASE;
- address_markers[8].start_address = IOREMAP_END;
+ 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_STD_MMU_64
- address_markers[9].start_address = H_VMEMMAP_BASE;
+ address_markers[i++].start_address = H_VMEMMAP_BASE;
#else
- address_markers[9].start_address = VMEMMAP_BASE;
+ 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)
@@ -435,7 +514,7 @@ static int ptdump_init(void)
populate_markers();
build_pgtable_complete_mask();
- debugfs_file = debugfs_create_file("kernel_pagetables", 0400, NULL,
+ debugfs_file = debugfs_create_file("kernel_page_tables", 0400, NULL,
NULL, &ptdump_fops);
return debugfs_file ? 0 : -ENOMEM;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.