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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-02-16 11:47:27 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-02-28 09:37:06 +0100 |
| commit | 1819ed1f06ade476b701ff764e6cd84a36aee8de (patch) | |
| tree | cae60343e840f87116a3966f141ef4df3beb56d2 /arch/s390 | |
| parent | 2a7d2b96d5cba7568139d9ab157a0e97ab32440f (diff) | |
| download | lwn-1819ed1f06ade476b701ff764e6cd84a36aee8de.tar.gz lwn-1819ed1f06ade476b701ff764e6cd84a36aee8de.zip | |
s390/page table dumper: add support for change-recording override bit
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 2 | ||||
| -rw-r--r-- | arch/s390/mm/dump_pagetables.c | 25 |
2 files changed, 22 insertions, 5 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 97de1200c849..4a2930844d43 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -340,6 +340,8 @@ extern unsigned long MODULES_END; #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV) #define _REGION3_ENTRY_LARGE 0x400 /* RTTE-format control, large page */ +#define _REGION3_ENTRY_RO 0x200 /* page protection bit */ +#define _REGION3_ENTRY_CO 0x100 /* change-recording override */ /* Bits in the segment table entry */ #define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */ diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c index 04e4892247d2..3ad65b04ac15 100644 --- a/arch/s390/mm/dump_pagetables.c +++ b/arch/s390/mm/dump_pagetables.c @@ -49,10 +49,13 @@ static void print_prot(struct seq_file *m, unsigned int pr, int level) { "ASCE", "PGD", "PUD", "PMD", "PTE" }; seq_printf(m, "%s ", level_name[level]); - if (pr & _PAGE_INVALID) + if (pr & _PAGE_INVALID) { seq_printf(m, "I\n"); - else - seq_printf(m, "%s\n", pr & _PAGE_RO ? "RO" : "RW"); + return; + } + seq_printf(m, "%s", pr & _PAGE_RO ? "RO " : "RW "); + seq_printf(m, "%s", pr & _PAGE_CO ? "CO " : " "); + seq_putc(m, '\n'); } static void note_page(struct seq_file *m, struct pg_state *st, @@ -125,6 +128,12 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st, } } +#ifdef CONFIG_64BIT +#define _PMD_PROT_MASK (_SEGMENT_ENTRY_RO | _SEGMENT_ENTRY_CO) +#else +#define _PMD_PROT_MASK 0 +#endif + static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t *pud, unsigned long addr) { @@ -137,7 +146,7 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pmd = pmd_offset(pud, addr); if (!pmd_none(*pmd)) { if (pmd_large(*pmd)) { - prot = pmd_val(*pmd) & _SEGMENT_ENTRY_RO; + prot = pmd_val(*pmd) & _PMD_PROT_MASK; note_page(m, st, prot, 3); } else walk_pte_level(m, st, pmd, addr); @@ -147,6 +156,12 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, } } +#ifdef CONFIG_64BIT +#define _PUD_PROT_MASK (_REGION3_ENTRY_RO | _REGION3_ENTRY_CO) +#else +#define _PUD_PROT_MASK 0 +#endif + static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t *pgd, unsigned long addr) { @@ -159,7 +174,7 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, pud = pud_offset(pgd, addr); if (!pud_none(*pud)) if (pud_large(*pud)) { - prot = pud_val(*pud) & _PAGE_RO; + prot = pud_val(*pud) & _PUD_PROT_MASK; note_page(m, st, prot, 2); } else walk_pmd_level(m, st, pud, addr); |