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Subject[PATCH v2 12/14] powerpc/mm: Make pte_fragment_alloc() common to PPC32 and PPC64
Date
In order to allow the 8xx to handle pte_fragments, this patch
makes it common to PPC32 and PPC64 by moving the related code
to common files and by defining a new config item called
CONFIG_NEED_PTE_FRAG

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/mmu_context.h | 28 ++++++++++++++
arch/powerpc/include/asm/page.h | 2 +-
arch/powerpc/mm/mmu_context_book3s64.c | 28 --------------
arch/powerpc/mm/pgtable.c | 67 ++++++++++++++++++++++++++++++++++
arch/powerpc/mm/pgtable_64.c | 67 ----------------------------------
arch/powerpc/platforms/Kconfig.cputype | 5 +++
6 files changed, 101 insertions(+), 96 deletions(-)

diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 1835ca1505d6..252988f7e219 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -262,5 +262,33 @@ static inline u64 pte_to_hpte_pkey_bits(u64 pteflags)

#endif /* CONFIG_PPC_MEM_KEYS */

+#ifdef CONFIG_NEED_PTE_FRAG
+static inline void destroy_pagetable_page(struct mm_struct *mm)
+{
+ int count;
+ void *pte_frag;
+ struct page *page;
+
+ pte_frag = mm->context.pte_frag;
+ if (!pte_frag)
+ return;
+
+ page = virt_to_page(pte_frag);
+ /* drop all the pending references */
+ count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
+ /* We allow PTE_FRAG_NR fragments from a PTE page */
+ if (page_ref_sub_and_test(page, PTE_FRAG_NR - count)) {
+ pgtable_page_dtor(page);
+ free_unref_page(page);
+ }
+}
+
+#else
+static inline void destroy_pagetable_page(struct mm_struct *mm)
+{
+ return;
+}
+#endif
+
#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index db7be0779d55..cd10564ff7df 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -344,7 +344,7 @@ struct vm_area_struct;
*/
typedef pte_t *pgtable_t;
#else
-#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_PPC64)
+#if defined(CONFIG_NEED_PTE_FRAG)
typedef pte_t *pgtable_t;
#else
typedef struct page *pgtable_t;
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
index b75194dff64c..2f55a4e3c09a 100644
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -192,34 +192,6 @@ static void destroy_contexts(mm_context_t *ctx)
spin_unlock(&mmu_context_lock);
}

-#ifdef CONFIG_PPC_64K_PAGES
-static void destroy_pagetable_page(struct mm_struct *mm)
-{
- int count;
- void *pte_frag;
- struct page *page;
-
- pte_frag = mm->context.pte_frag;
- if (!pte_frag)
- return;
-
- page = virt_to_page(pte_frag);
- /* drop all the pending references */
- count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
- /* We allow PTE_FRAG_NR fragments from a PTE page */
- if (page_ref_sub_and_test(page, PTE_FRAG_NR - count)) {
- pgtable_page_dtor(page);
- free_unref_page(page);
- }
-}
-
-#else
-static inline void destroy_pagetable_page(struct mm_struct *mm)
-{
- return;
-}
-#endif
-
void destroy_context(struct mm_struct *mm)
{
#ifdef CONFIG_SPAPR_TCE_IOMMU
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index 9f361ae571e9..2d34755ed727 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -264,3 +264,70 @@ unsigned long vmalloc_to_phys(void *va)
return __pa(pfn_to_kaddr(pfn)) + offset_in_page(va);
}
EXPORT_SYMBOL_GPL(vmalloc_to_phys);
+
+#ifdef CONFIG_NEED_PTE_FRAG
+static pte_t *get_from_cache(struct mm_struct *mm)
+{
+ void *pte_frag, *ret;
+
+ spin_lock(&mm->page_table_lock);
+ ret = mm->context.pte_frag;
+ if (ret) {
+ pte_frag = ret + PTE_FRAG_SIZE;
+ /*
+ * If we have taken up all the fragments mark PTE page NULL
+ */
+ if (((unsigned long)pte_frag & ~PAGE_MASK) == 0)
+ pte_frag = NULL;
+ mm->context.pte_frag = pte_frag;
+ }
+ spin_unlock(&mm->page_table_lock);
+ return (pte_t *)ret;
+}
+
+static pte_t *__alloc_for_cache(struct mm_struct *mm, int kernel)
+{
+ void *ret = NULL;
+ struct page *page;
+
+ if (!kernel) {
+ page = alloc_page(PGALLOC_GFP | __GFP_ACCOUNT);
+ if (!page)
+ return NULL;
+ if (!pgtable_page_ctor(page)) {
+ __free_page(page);
+ return NULL;
+ }
+ } else {
+ page = alloc_page(PGALLOC_GFP);
+ if (!page)
+ return NULL;
+ }
+
+ ret = page_address(page);
+ spin_lock(&mm->page_table_lock);
+ /*
+ * If we find pgtable_page set, we return
+ * the allocated page with single fragement
+ * count.
+ */
+ if (likely(!mm->context.pte_frag)) {
+ set_page_count(page, PTE_FRAG_NR);
+ mm->context.pte_frag = ret + PTE_FRAG_SIZE;
+ }
+ spin_unlock(&mm->page_table_lock);
+
+ return (pte_t *)ret;
+}
+
+pte_t *pte_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr, int kernel)
+{
+ pte_t *pte;
+
+ pte = get_from_cache(mm);
+ if (pte)
+ return pte;
+
+ return __alloc_for_cache(mm, kernel);
+}
+#endif
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index dd1102a246e4..1d8dc37d98a7 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -139,73 +139,6 @@ struct page *pmd_page(pmd_t pmd)
return virt_to_page(pmd_page_vaddr(pmd));
}

-#ifdef CONFIG_PPC_64K_PAGES
-static pte_t *get_from_cache(struct mm_struct *mm)
-{
- void *pte_frag, *ret;
-
- spin_lock(&mm->page_table_lock);
- ret = mm->context.pte_frag;
- if (ret) {
- pte_frag = ret + PTE_FRAG_SIZE;
- /*
- * If we have taken up all the fragments mark PTE page NULL
- */
- if (((unsigned long)pte_frag & ~PAGE_MASK) == 0)
- pte_frag = NULL;
- mm->context.pte_frag = pte_frag;
- }
- spin_unlock(&mm->page_table_lock);
- return (pte_t *)ret;
-}
-
-static pte_t *__alloc_for_cache(struct mm_struct *mm, int kernel)
-{
- void *ret = NULL;
- struct page *page;
-
- if (!kernel) {
- page = alloc_page(PGALLOC_GFP | __GFP_ACCOUNT);
- if (!page)
- return NULL;
- if (!pgtable_page_ctor(page)) {
- __free_page(page);
- return NULL;
- }
- } else {
- page = alloc_page(PGALLOC_GFP);
- if (!page)
- return NULL;
- }
-
- ret = page_address(page);
- spin_lock(&mm->page_table_lock);
- /*
- * If we find pgtable_page set, we return
- * the allocated page with single fragement
- * count.
- */
- if (likely(!mm->context.pte_frag)) {
- set_page_count(page, PTE_FRAG_NR);
- mm->context.pte_frag = ret + PTE_FRAG_SIZE;
- }
- spin_unlock(&mm->page_table_lock);
-
- return (pte_t *)ret;
-}
-
-pte_t *pte_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr, int kernel)
-{
- pte_t *pte;
-
- pte = get_from_cache(mm);
- if (pte)
- return pte;
-
- return __alloc_for_cache(mm, kernel);
-}
-#endif /* CONFIG_PPC_64K_PAGES */
-
void pte_fragment_free(unsigned long *table, int kernel)
{
struct page *page = virt_to_page(table);
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 8606fa253089..906f0ebd1e08 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -337,6 +337,11 @@ config PPC_MM_SLICES
default y if PPC_8xx && HUGETLB_PAGE
default n

+config NEED_PTE_FRAG
+ bool
+ default y if PPC_BOOK3S_64 && PPC_64K_PAGES
+ default n
+
config PPC_HAVE_PMU_SUPPORT
bool

--
2.13.3
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