[S390] add support for nonquiescing sske

Improve performance of the sske operation by using the nonquiescing
variant if the affected page has no mappings established. On machines
with no support for the new sske variant the mask bit will be ignored.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

7 files changed, 18 insertions, 12 deletions

diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h
index af650fb4720..a8729ea7e9a 100644
--- a/arch/s390/include/asm/page.h
+++ b/arch/s390/include/asm/page.h
@@ -108,9 +108,13 @@ typedef pte_t *pgtable_t;
 #define __pgprot(x)     ((pgprot_t) { (x) } )
 
 static inline void
-page_set_storage_key(unsigned long addr, unsigned int skey)
+page_set_storage_key(unsigned long addr, unsigned int skey, int mapped)
 {
-        asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
+        if (!mapped)
+                asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
+                             : : "d" (skey), "a" (addr));
+        else
+                asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 }
 
 static inline unsigned int
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 85cd4b039de..f79e7bb9ae1 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -590,7 +590,7 @@ static inline void rcp_unlock(pte_t *ptep)
 }
 
 /* forward declaration for SetPageUptodate in page-flags.h*/
-static inline void page_clear_dirty(struct page *page);
+static inline void page_clear_dirty(struct page *page, int mapped);
 #include <linux/page-flags.h>
 
 static inline void ptep_rcp_copy(pte_t *ptep)
@@ -800,7 +800,7 @@ static inline int kvm_s390_test_and_clear_page_dirty(struct mm_struct *mm,
         }
         dirty = test_and_clear_bit_simple(KVM_UD_BIT, pgste);
         if (skey & _PAGE_CHANGED)
-                page_clear_dirty(page);
+                page_clear_dirty(page, 1);
         rcp_unlock(ptep);
         return dirty;
 }
@@ -975,9 +975,9 @@ static inline int page_test_dirty(struct page *page)
 }
 
 #define __HAVE_ARCH_PAGE_CLEAR_DIRTY
-static inline void page_clear_dirty(struct page *page)
+static inline void page_clear_dirty(struct page *page, int mapped)
 {
-        page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY);
+        page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY, mapped);
 }
 
 /*
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index c00856ad4e5..0badc6344eb 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -208,7 +208,8 @@ static noinline __init void init_kernel_storage_key(void)
         end_pfn = PFN_UP(__pa(&_end));
 
         for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
-                page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
+                page_set_storage_key(init_pfn << PAGE_SHIFT,
+                                     PAGE_DEFAULT_KEY, 0);
 }
 
 static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index c8e8e1354e1..9071e984dcf 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -627,7 +627,8 @@ setup_memory(void)
                 add_active_range(0, start_chunk, end_chunk);
                 pfn = max(start_chunk, start_pfn);
                 for (; pfn < end_chunk; pfn++)
-                        page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
+                        page_set_storage_key(PFN_PHYS(pfn),
+                                             PAGE_DEFAULT_KEY, 0);
         }
 
         psw_set_key(PAGE_DEFAULT_KEY);
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index f4d4120e512..6f3c6ae4fe0 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -108,7 +108,7 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
 #endif
 
 #ifndef __HAVE_ARCH_PAGE_CLEAR_DIRTY
-#define page_clear_dirty(page)          do { } while (0)
+#define page_clear_dirty(page, mapped)  do { } while (0)
 #endif
 
 #ifndef __HAVE_ARCH_PAGE_TEST_DIRTY
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 6fa317801e1..5f38c460367 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -310,7 +310,7 @@ static inline void SetPageUptodate(struct page *page)
 {
 #ifdef CONFIG_S390
         if (!test_and_set_bit(PG_uptodate, &page->flags))
-                page_clear_dirty(page);
+                page_clear_dirty(page, 0);
 #else
         /*
          * Memory barrier must be issued before setting the PG_uptodate bit,
diff --git a/mm/rmap.c b/mm/rmap.c
index 92e6757f196..5f17fad1bee 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -745,7 +745,7 @@ int page_mkclean(struct page *page)
                 if (mapping) {
                         ret = page_mkclean_file(mapping, page);
                         if (page_test_dirty(page)) {
-                                page_clear_dirty(page);
+                                page_clear_dirty(page, 1);
                                 ret = 1;
                         }
                 }
@@ -942,7 +942,7 @@ void page_remove_rmap(struct page *page)
          * containing the swap entry, but page not yet written to swap.
          */
         if ((!PageAnon(page) || PageSwapCache(page)) && page_test_dirty(page)) {
-                page_clear_dirty(page);
+                page_clear_dirty(page, 1);
                 set_page_dirty(page);
         }
         /*