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powerpc/ptdump: Dump PXX level info for kernel_page_tables

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This patch adds PGD/PUD/PMD/PTE level information while dumping kernel
page tables. Before this patch it was hard to identify which entries
belongs to which page table level e.g.

~ # dmesg |grep -i radix
[0.000000] radix-mmu: Mapped 0x0000000000000000-0x0000000005400000 with 2.00 MiB pages (exec)
[0.000000] radix-mmu: Mapped 0x0000000005400000-0x0000000040000000 with 2.00 MiB pages
[0.000000] radix-mmu: Mapped 0x0000000040000000-0x0000000100000000 with 1.00 GiB pages
[0.000000] radix-mmu: Initializing Radix MMU

Before:
---[ Start of kernel VM ]---
0xc000000000000000-0xc000000003ffffff  XXX   64M   r      X   pte  valid  present  dirty  accessed
0xc000000004000000-0xc00000003fffffff  XXX  960M   r  w       pte  valid  present  dirty  accessed
0xc000000040000000-0xc0000000ffffffff  XXX    3G   r  w       pte  valid  present  dirty  accessed
...
---[ vmemmap start ]---
0xc00c000000000000-0xc00c0000003fffff  XXX    4M   r  w       pte  valid  present  dirty  accessed

After:
---[ Start of kernel VM ]---
0xc000000000000000-0xc000000003ffffff  XXX   64M PMD  r      X   pte  valid  present  dirty  accessed
0xc000000004000000-0xc00000003fffffff  XXX  960M PMD  r  w       pte  valid  present  dirty  accessed
0xc000000040000000-0xc0000000ffffffff  XXX    3G PUD  r  w       pte  valid  present  dirty  accessed
...
---[ vmemmap start ]---
0xc00c000000000000-0xc00c0000003fffff  XXX    4M PMD  r  w       pte  valid  present  dirty  accessed

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/95defb675ee5607ef3923a1e6aeac39311b8fad4.1761834163.git.ritesh.list@gmail.com
This commit is contained in:
Ritesh Harjani (IBM)
2025-10-30 20:27:34 +05:30
committed by Madhavan Srinivasan
parent 6394f0e8ab
commit 3d44be297e
5 changed files with 17 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/powerpc/mm/ptdump/8xx.c
View File

@@ -71,18 +71,23 @@ static const struct flag_info flag_array[] = {
struct ptdump_pg_level pg_level[5] = {
{ /* pgd */
.name = "PGD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* p4d */
.name = "P4D",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pud */
.name = "PUD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pmd */
.name = "PMD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pte */
.name = "PTE",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
},

5
arch/powerpc/mm/ptdump/book3s64.c
View File

@@ -104,18 +104,23 @@ static const struct flag_info flag_array[] = {
struct ptdump_pg_level pg_level[5] = {
{ /* pgd */
.name = "PGD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* p4d */
.name = "P4D",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pud */
.name = "PUD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pmd */
.name = "PMD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pte */
.name = "PTE",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
},

1
arch/powerpc/mm/ptdump/ptdump.c
View File

@@ -178,6 +178,7 @@ static void dump_addr(struct pg_state *st, unsigned long addr)
pt_dump_seq_printf(st->seq, REG "-" REG " ", st->start_address, addr - 1);
pt_dump_seq_printf(st->seq, " " REG " ", st->start_pa);
pt_dump_size(st->seq, addr - st->start_address);
pt_dump_seq_printf(st->seq, "%s ", pg_level[st->level].name);
}
static void note_prot_wx(struct pg_state *st, unsigned long addr)

1
arch/powerpc/mm/ptdump/ptdump.h
View File

@@ -13,6 +13,7 @@ struct flag_info {
struct ptdump_pg_level {
const struct flag_info *flag;
char name[4];
size_t num;
u64 mask;
};

5
arch/powerpc/mm/ptdump/shared.c
View File

@@ -69,18 +69,23 @@ static const struct flag_info flag_array[] = {
struct ptdump_pg_level pg_level[5] = {
{ /* pgd */
.name = "PGD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* p4d */
.name = "P4D",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pud */
.name = "PUD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pmd */
.name = "PMD",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
}, { /* pte */
.name = "PTE",
.flag = flag_array,
.num = ARRAY_SIZE(flag_array),
},