diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2012-10-08 09:18:26 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-11-23 11:14:24 +0100 |
| commit | 18da236908793abccebc6f365fbe6e95a5b41db0 (patch) | |
| tree | 34899d0c737b625660a44f2b47436e5e82a17511 /arch/s390/mm | |
| parent | 26d29d06ea020411559f75ec908db235ca1838d9 (diff) | |
s390/mm,vmem: use 2GB frames for identity mapping
Use 2GB frames for indentity mapping if EDAT2 is
available to reduce TLB pressure.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/dump_pagetables.c | 7 | ||||
| -rw-r--r-- | arch/s390/mm/pageattr.c | 2 | ||||
| -rw-r--r-- | arch/s390/mm/vmem.c | 20 |
3 files changed, 23 insertions, 6 deletions
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c index cbc6668acb8..04e4892247d 100644 --- a/arch/s390/mm/dump_pagetables.c +++ b/arch/s390/mm/dump_pagetables.c @@ -150,6 +150,7 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t *pgd, unsigned long addr) { + unsigned int prot; pud_t *pud; int i; @@ -157,7 +158,11 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, st->current_address = addr; pud = pud_offset(pgd, addr); if (!pud_none(*pud)) - walk_pmd_level(m, st, pud, addr); + if (pud_large(*pud)) { + prot = pud_val(*pud) & _PAGE_RO; + note_page(m, st, prot, 2); + } else + walk_pmd_level(m, st, pud, addr); else note_page(m, st, _PAGE_INVALID, 2); addr += PUD_SIZE; diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c index 00be01c4b4f..c7ec7c2e46b 100644 --- a/arch/s390/mm/pageattr.c +++ b/arch/s390/mm/pageattr.c @@ -19,7 +19,7 @@ static pte_t *walk_page_table(unsigned long addr) if (pgd_none(*pgdp)) return NULL; pudp = pud_offset(pgdp, addr); - if (pud_none(*pudp)) + if (pud_none(*pudp) || pud_large(*pudp)) return NULL; pmdp = pmd_offset(pudp, addr); if (pmd_none(*pmdp) || pmd_large(*pmdp)) diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 387c7c60b5b..bf37a094a46 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -89,6 +89,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro) int ret = -ENOMEM; while (address < end) { + pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0)); pg_dir = pgd_offset_k(address); if (pgd_none(*pg_dir)) { pu_dir = vmem_pud_alloc(); @@ -96,18 +97,24 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro) goto out; pgd_populate(&init_mm, pg_dir, pu_dir); } - pu_dir = pud_offset(pg_dir, address); +#if defined(CONFIG_64BIT) && !defined(CONFIG_DEBUG_PAGEALLOC) + if (MACHINE_HAS_EDAT2 && pud_none(*pu_dir) && address && + !(address & ~PUD_MASK) && (address + PUD_SIZE <= end)) { + pte_val(pte) |= _REGION3_ENTRY_LARGE; + pte_val(pte) |= _REGION_ENTRY_TYPE_R3; + pud_val(*pu_dir) = pte_val(pte); + address += PUD_SIZE; + continue; + } +#endif if (pud_none(*pu_dir)) { pm_dir = vmem_pmd_alloc(); if (!pm_dir) goto out; pud_populate(&init_mm, pu_dir, pm_dir); } - - pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0)); pm_dir = pmd_offset(pu_dir, address); - #if defined(CONFIG_64BIT) && !defined(CONFIG_DEBUG_PAGEALLOC) if (MACHINE_HAS_EDAT1 && pmd_none(*pm_dir) && address && !(address & ~PMD_MASK) && (address + PMD_SIZE <= end)) { @@ -160,6 +167,11 @@ static void vmem_remove_range(unsigned long start, unsigned long size) address += PUD_SIZE; continue; } + if (pud_large(*pu_dir)) { + pud_clear(pu_dir); + address += PUD_SIZE; + continue; + } pm_dir = pmd_offset(pu_dir, address); if (pmd_none(*pm_dir)) { address += PMD_SIZE; |