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: Ritesh Harjani (IBM) <[e-mail]>
Signed-off-by: Madhavan Srinivasan <[e-mail]>
Link: https://patch.msgid.link/95d[e-mail]

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

···
 
 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

···
 
 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

···
 	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

···
 
 struct ptdump_pg_level {
 	const struct flag_info *flag;
+	char name[4];
 	size_t num;
 	u64 mask;
 };

arch/powerpc/mm/ptdump/shared.c

···
 
 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),
 	},