sh: update_mmu_cache() consolidation.

This splits out a separate __update_cache()/__update_tlb() for
update_mmu_cache() to wrap in to. This lets us share the common
__update_cache() bits while keeping special __update_tlb() handling
broken out.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/asm/pgtable.h

@@ -134,8 +134,19 @@ typedef pte_t *pte_addr_t;
 #define pgtable_cache_init()	do { } while (0)
 
 struct vm_area_struct;
-extern void update_mmu_cache(struct vm_area_struct * vma,
-			     unsigned long address, pte_t pte);
+
+extern void __update_cache(struct vm_area_struct *vma,
+			   unsigned long address, pte_t pte);
+extern void __update_tlb(struct vm_area_struct *vma,
+			 unsigned long address, pte_t pte);
+
+static inline void
+update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
+{
+	__update_cache(vma, address, pte);
+	__update_tlb(vma, address, pte);
+}
+
 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 extern void paging_init(void);
 extern void page_table_range_init(unsigned long start, unsigned long end,

arch/sh/mm/pg-mmu.c

@@ -134,3 +134,24 @@ void clear_user_highpage(struct page *page, unsigned long vaddr)
 	kunmap_atomic(kaddr, KM_USER0);
 }
 EXPORT_SYMBOL(clear_user_highpage);
+
+void __update_cache(struct vm_area_struct *vma,
+		    unsigned long address, pte_t pte)
+{
+	struct page *page;
+	unsigned long pfn = pte_pfn(pte);
+
+	if (!boot_cpu_data.dcache.n_aliases)
+		return;
+
+	page = pfn_to_page(pfn);
+	if (pfn_valid(pfn) && page_mapping(page)) {
+		int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
+		if (dirty) {
+			unsigned long addr = (unsigned long)page_address(page);
+
+			if (pages_do_alias(addr, address & PAGE_MASK))
+				__flush_wback_region((void *)addr, PAGE_SIZE);
+		}
+	}
+}

arch/sh/mm/tlb-nommu.c

@@ -46,10 +46,13 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
 	BUG();
 }
 
-void update_mmu_cache(struct vm_area_struct * vma,
-		      unsigned long address, pte_t pte)
+void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
+{
+}
+
+void __update_cache(struct vm_area_struct *vma,
+		    unsigned long address, pte_t pte)
 {
-	BUG();
 }
 
 void __init page_table_range_init(unsigned long start, unsigned long end,

arch/sh/mm/tlb-pteaex.c

@@ -16,15 +16,14 @@
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
 
-void update_mmu_cache(struct vm_area_struct * vma,
-		      unsigned long address, pte_t pte)
+void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
 {
-	unsigned long flags;
-	unsigned long pteval;
-	unsigned long vpn;
+	unsigned long flags, pteval, vpn;
 
-	/* Ptrace may call this routine. */
-	if (vma && current->active_mm != vma->vm_mm)
+	/*
+	 * Handle debugger faulting in for debugee.
+	 */
+	if (current->active_mm != vma->vm_mm)
 		return;
 
 	local_irq_save(flags);

arch/sh/mm/tlb-sh3.c

@@ -27,32 +27,16 @@
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
 
-void update_mmu_cache(struct vm_area_struct * vma,
-		      unsigned long address, pte_t pte)
+void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
 {
-	unsigned long flags;
-	unsigned long pteval;
-	unsigned long vpn;
-	unsigned long pfn = pte_pfn(pte);
-	struct page *page;
+	unsigned long flags, pteval, vpn;
 
-	/* Ptrace may call this routine. */
-	if (vma && current->active_mm != vma->vm_mm)
+	/*
+	 * Handle debugger faulting in for debugee.
+	 */
+	if (current->active_mm != vma->vm_mm)
 		return;
 
-	page = pfn_to_page(pfn);
-	if (pfn_valid(pfn) && page_mapping(page)) {
-#if defined(CONFIG_SH7705_CACHE_32KB)
-		int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
-		if (dirty) {
-			unsigned long addr = (unsigned long)page_address(page);
-
-			if (pages_do_alias(addr, address & PAGE_MASK))
-				__flush_wback_region((void *)addr, PAGE_SIZE);
-		}
-#endif
-	}
-
 	local_irq_save(flags);
 
 	/* Set PTEH register */
@@ -93,4 +77,3 @@ void local_flush_tlb_one(unsigned long asid, unsigned long page)
 	for (i = 0; i < ways; i++)
 		ctrl_outl(data, addr + (i << 8));
 }
-

arch/sh/mm/tlb-sh4.c

@@ -15,33 +15,16 @@
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>
 
-void update_mmu_cache(struct vm_area_struct * vma,
-		      unsigned long address, pte_t pte)
+void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
 {
-	unsigned long flags;
-	unsigned long pteval;
-	unsigned long vpn;
-	unsigned long pfn = pte_pfn(pte);
-	struct page *page;
+	unsigned long flags, pteval, vpn;
 
-	/* Ptrace may call this routine. */
-	if (vma && current->active_mm != vma->vm_mm)
+	/*
+	 * Handle debugger faulting in for debugee.
+	 */
+	if (current->active_mm != vma->vm_mm)
 		return;
 
-	page = pfn_to_page(pfn);
-	if (pfn_valid(pfn) && page_mapping(page)) {
-#ifndef CONFIG_SMP
-		int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
-		if (dirty) {
-
-			unsigned long addr = (unsigned long)page_address(page);
-
-			if (pages_do_alias(addr, address & PAGE_MASK))
-				__flush_wback_region((void *)addr, PAGE_SIZE);
-		}
-#endif
-	}
-
 	local_irq_save(flags);
 
 	/* Set PTEH register */

arch/sh/mm/tlbflush_64.c

@@ -329,22 +329,6 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess,
 		goto no_context;
 }
 
-void update_mmu_cache(struct vm_area_struct * vma,
-			unsigned long address, pte_t pte)
-{
-	/*
-	 * This appears to get called once for every pte entry that gets
-	 * established => I don't think it's efficient to try refilling the
-	 * TLBs with the pages - some may not get accessed even.  Also, for
-	 * executable pages, it is impossible to determine reliably here which
-	 * TLB they should be mapped into (or both even).
-	 *
-	 * So, just do nothing here and handle faults on demand.  In the
-	 * TLBMISS handling case, the refill is now done anyway after the pte
-	 * has been fixed up, so that deals with most useful cases.
-	 */
-}
-
 void local_flush_tlb_one(unsigned long asid, unsigned long page)
 {
 	unsigned long long match, pteh=0, lpage;
@@ -482,3 +466,12 @@ void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)
         /* FIXME: Optimize this later.. */
         flush_tlb_all();
 }
+
+void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
+{
+}
+
+void __update_cache(struct vm_area_struct *vma,
+		    unsigned long address, pte_t pte)
+{
+}