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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-10-08 09:18:26 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-11-23 11:14:24 +0100
commit18da236908793abccebc6f365fbe6e95a5b41db0 (patch)
tree34899d0c737b625660a44f2b47436e5e82a17511
parent26d29d06ea020411559f75ec908db235ca1838d9 (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>
-rw-r--r--arch/s390/include/asm/pgtable.h10
-rw-r--r--arch/s390/mm/dump_pagetables.c7
-rw-r--r--arch/s390/mm/pageattr.c2
-rw-r--r--arch/s390/mm/vmem.c20
4 files changed, 33 insertions, 6 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d3b7cb26005..0eefb9e192d1 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -345,6 +345,8 @@ extern unsigned long MODULES_END;
#define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV)
+#define _REGION3_ENTRY_LARGE 0x400 /* RTTE-format control, large page */
+
/* Bits in the segment table entry */
#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
@@ -444,6 +446,7 @@ static inline int pgd_bad(pgd_t pgd) { return 0; }
static inline int pud_present(pud_t pud) { return 1; }
static inline int pud_none(pud_t pud) { return 0; }
+static inline int pud_large(pud_t pud) { return 0; }
static inline int pud_bad(pud_t pud) { return 0; }
#else /* CONFIG_64BIT */
@@ -489,6 +492,13 @@ static inline int pud_none(pud_t pud)
return (pud_val(pud) & _REGION_ENTRY_INV) != 0UL;
}
+static inline int pud_large(pud_t pud)
+{
+ if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) != _REGION_ENTRY_TYPE_R3)
+ return 0;
+ return !!(pud_val(pud) & _REGION3_ENTRY_LARGE);
+}
+
static inline int pud_bad(pud_t pud)
{
/*
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index cbc6668acb85..04e4892247d2 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 00be01c4b4f3..c7ec7c2e46b0 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 387c7c60b5b8..bf37a094a46b 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;