Commit 3d44be29 authored by Ritesh Harjani (IBM)'s avatar Ritesh Harjani (IBM) Committed by Madhavan Srinivasan
Browse files

powerpc/ptdump: Dump PXX level info for kernel_page_tables 



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: default avatarRitesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/95defb675ee5607ef3923a1e6aeac39311b8fad4.1761834163.git.ritesh.list@gmail.com
parent 6394f0e8

arch/powerpc/mm/ptdump/8xx.c

+5 −0
Original line number Diff line number Diff line
@@ -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),

	},

arch/powerpc/mm/ptdump/book3s64.c

+5 −0
Original line number Diff line number Diff line
@@ -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),

	},

arch/powerpc/mm/ptdump/ptdump.c

+1 −0
Original line number Diff line number Diff line
@@ -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)

arch/powerpc/mm/ptdump/ptdump.h

+1 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ struct flag_info { 


struct ptdump_pg_level {

	const struct flag_info *flag;

	char name[4];

	size_t num;

	u64 mask;

};

arch/powerpc/mm/ptdump/shared.c

+5 −0
Original line number Diff line number Diff line
@@ -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),

	},