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>
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 387c7c6..bf37a09 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -89,6 +89,7 @@
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 @@
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 @@
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;