1 files changed, 56 insertions, 13 deletions

diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c
index c6844cb9b508..391ffae75098 100644
--- a/arch/arm/mm/flush.c
+++ b/arch/arm/mm/flush.c
@@ -17,6 +17,7 @@
 #include <asm/smp_plat.h>
 #include <asm/system.h>
 #include <asm/tlbflush.h>
+#include <asm/smp_plat.h>
 
 #include "mm.h"
 
@@ -39,6 +40,18 @@ static void flush_pfn_alias(unsigned long pfn, unsigned long vaddr)
             : "cc");
 }
 
+static void flush_icache_alias(unsigned long pfn, unsigned long vaddr, unsigned long len)
+{
+        unsigned long colour = CACHE_COLOUR(vaddr);
+        unsigned long offset = vaddr & (PAGE_SIZE - 1);
+        unsigned long to;
+
+        set_pte_ext(TOP_PTE(ALIAS_FLUSH_START) + colour, pfn_pte(pfn, PAGE_KERNEL), 0);
+        to = ALIAS_FLUSH_START + (colour << PAGE_SHIFT) + offset;
+        flush_tlb_kernel_page(to);
+        flush_icache_range(to, to + len);
+}
+
 void flush_cache_mm(struct mm_struct *mm)
 {
         if (cache_is_vivt()) {
@@ -89,16 +102,16 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsig
         if (vma->vm_flags & VM_EXEC && icache_is_vivt_asid_tagged())
                 __flush_icache_all();
 }
+
 #else
-#define flush_pfn_alias(pfn,vaddr)      do { } while (0)
+#define flush_pfn_alias(pfn,vaddr)              do { } while (0)
+#define flush_icache_alias(pfn,vaddr,len)       do { } while (0)
 #endif
 
-#ifdef CONFIG_SMP
 static void flush_ptrace_access_other(void *args)
 {
         __flush_icache_all();
 }
-#endif
 
 static
 void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
@@ -118,15 +131,16 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
                 return;
         }
 
-        /* VIPT non-aliasing cache */
+        /* VIPT non-aliasing D-cache */
         if (vma->vm_flags & VM_EXEC) {
                 unsigned long addr = (unsigned long)kaddr;
-                __cpuc_coherent_kern_range(addr, addr + len);
-#ifdef CONFIG_SMP
+                if (icache_is_vipt_aliasing())
+                        flush_icache_alias(page_to_pfn(page), uaddr, len);
+                else
+                        __cpuc_coherent_kern_range(addr, addr + len);
                 if (cache_ops_need_broadcast())
                         smp_call_function(flush_ptrace_access_other,
                                           NULL, 1);
-#endif
         }
 }
 
@@ -215,6 +229,36 @@ static void __flush_dcache_aliases(struct address_space *mapping, struct page *p
         flush_dcache_mmap_unlock(mapping);
 }
 
+#if __LINUX_ARM_ARCH__ >= 6
+void __sync_icache_dcache(pte_t pteval)
+{
+        unsigned long pfn;
+        struct page *page;
+        struct address_space *mapping;
+
+        if (!pte_present_user(pteval))
+                return;
+        if (cache_is_vipt_nonaliasing() && !pte_exec(pteval))
+                /* only flush non-aliasing VIPT caches for exec mappings */
+                return;
+        pfn = pte_pfn(pteval);
+        if (!pfn_valid(pfn))
+                return;
+
+        page = pfn_to_page(pfn);
+        if (cache_is_vipt_aliasing())
+                mapping = page_mapping(page);
+        else
+                mapping = NULL;
+
+        if (!test_and_set_bit(PG_dcache_clean, &page->flags))
+                __flush_dcache_page(mapping, page);
+        /* pte_exec() already checked above for non-aliasing VIPT cache */
+        if (cache_is_vipt_nonaliasing() || pte_exec(pteval))
+                __flush_icache_all();
+}
+#endif
+
 /*
  * Ensure cache coherency between kernel mapping and userspace mapping
  * of this page.
@@ -246,17 +290,16 @@ void flush_dcache_page(struct page *page)
 
         mapping = page_mapping(page);
 
-#ifndef CONFIG_SMP
-        if (!PageHighMem(page) && mapping && !mapping_mapped(mapping))
-                set_bit(PG_dcache_dirty, &page->flags);
-        else
-#endif
-        {
+        if (!cache_ops_need_broadcast() &&
+            mapping && !mapping_mapped(mapping))
+                clear_bit(PG_dcache_clean, &page->flags);
+        else {
                 __flush_dcache_page(mapping, page);
                 if (mapping && cache_is_vivt())
                         __flush_dcache_aliases(mapping, page);
                 else if (mapping)
                         __flush_icache_all();
+                set_bit(PG_dcache_clean, &page->flags);
         }
 }
 EXPORT_SYMBOL(flush_dcache_page);