From 2a5eacca85d39d8b6dffae821d7d260f05584dc7 Mon Sep 17 00:00:00 2001
From: Matt Fleming <matt@console-pimps.org>
Date: Thu, 31 Dec 2009 12:19:24 +0000
Subject: sh: Move page table allocation out of line

We also switched away from quicklists and instead moved to slab
caches. After benchmarking both implementations the difference is
negligible. The slab caches suit us better though because the size of a
pgd table is just 4 entries when we're using a 3-level page table layout
and quicklists always deal with pages.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
---
 arch/sh/mm/pgtable.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 arch/sh/mm/pgtable.c

(limited to 'arch/sh/mm/pgtable.c')

diff --git a/arch/sh/mm/pgtable.c b/arch/sh/mm/pgtable.c
new file mode 100644
index 000000000000..e1bc5483cc07
--- /dev/null
+++ b/arch/sh/mm/pgtable.c
@@ -0,0 +1,57 @@
+#include <linux/mm.h>
+
+#define PGALLOC_GFP GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO
+
+static struct kmem_cache *pgd_cachep;
+
+#ifdef CONFIG_PGTABLE_LEVELS_3
+static struct kmem_cache *pmd_cachep;
+#endif
+
+void pgd_ctor(void *x)
+{
+	pgd_t *pgd = x;
+
+	memcpy(pgd + USER_PTRS_PER_PGD,
+	       swapper_pg_dir + USER_PTRS_PER_PGD,
+	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
+}
+
+void pgtable_cache_init(void)
+{
+	pgd_cachep = kmem_cache_create("pgd_cache",
+				       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
+				       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
+#ifdef CONFIG_PGTABLE_LEVELS_3
+	pmd_cachep = kmem_cache_create("pmd_cache",
+				       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
+				       PAGE_SIZE, SLAB_PANIC, NULL);
+#endif
+}
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+	return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
+}
+
+void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+	kmem_cache_free(pgd_cachep, pgd);
+}
+
+#ifdef CONFIG_PGTABLE_LEVELS_3
+void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
+{
+	set_pud(pud, __pud((unsigned long)pmd));
+}
+
+pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+	return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
+}
+
+void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+	kmem_cache_free(pmd_cachep, pmd);
+}
+#endif /* CONFIG_PGTABLE_LEVELS_3 */
-- 
cgit v1.2.3


From 782bb5a532f883540bf403afb19f735a4eefd95b Mon Sep 17 00:00:00 2001
From: Paul Mundt <lethal@linux-sh.org>
Date: Wed, 13 Jan 2010 19:11:14 +0900
Subject: sh: default to extended TLB support.

All SH-X2 and SH-X3 parts support an extended TLB mode, which has been
left as experimental since support was originally merged. Now that it's
had some time to stabilize and get some exposure to various platforms,
we can drop it as an option and default enable it across the board.

This is also good future proofing for newer parts that will drop support
for the legacy TLB mode completely.

This will also force 3-level page tables for all newer parts, which is
necessary both for the varying page sizes and larger memories.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
---
 arch/sh/mm/pgtable.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

(limited to 'arch/sh/mm/pgtable.c')

diff --git a/arch/sh/mm/pgtable.c b/arch/sh/mm/pgtable.c
index e1bc5483cc07..6f21fb1d8726 100644
--- a/arch/sh/mm/pgtable.c
+++ b/arch/sh/mm/pgtable.c
@@ -3,8 +3,7 @@
 #define PGALLOC_GFP GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO
 
 static struct kmem_cache *pgd_cachep;
-
-#ifdef CONFIG_PGTABLE_LEVELS_3
+#if PAGETABLE_LEVELS > 2
 static struct kmem_cache *pmd_cachep;
 #endif
 
@@ -22,7 +21,7 @@ void pgtable_cache_init(void)
 	pgd_cachep = kmem_cache_create("pgd_cache",
 				       PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
 				       PAGE_SIZE, SLAB_PANIC, pgd_ctor);
-#ifdef CONFIG_PGTABLE_LEVELS_3
+#if PAGETABLE_LEVELS > 2
 	pmd_cachep = kmem_cache_create("pmd_cache",
 				       PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
 				       PAGE_SIZE, SLAB_PANIC, NULL);
@@ -39,7 +38,7 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 	kmem_cache_free(pgd_cachep, pgd);
 }
 
-#ifdef CONFIG_PGTABLE_LEVELS_3
+#if PAGETABLE_LEVELS > 2
 void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 {
 	set_pud(pud, __pud((unsigned long)pmd));
@@ -54,4 +53,4 @@ void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 {
 	kmem_cache_free(pmd_cachep, pmd);
 }
-#endif /* CONFIG_PGTABLE_LEVELS_3 */
+#endif /* PAGETABLE_LEVELS > 2 */
-- 
cgit v1.2.3