nios2: rework cache

- flush dcache before flush instruction cache
- remork update_mmu_cache and flush_dcache_page
- add shmparam.h
Signed-off-by: Ley Foon Tan <lftan@altera.com>

arch/nios2/include/asm/Kbuild

@@ -46,7 +46,6 @@ generic-y += segment.h
 generic-y += sembuf.h
 generic-y += serial.h
 generic-y += shmbuf.h
-generic-y += shmparam.h
 generic-y += siginfo.h
 generic-y += signal.h
 generic-y += socket.h

arch/nios2/include/asm/shmparam.h

+/*
+ * Copyright Altera Corporation (C) <2015>. All rights reserved
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _ASM_NIOS2_SHMPARAM_H
+#define _ASM_NIOS2_SHMPARAM_H
+
+#define	SHMLBA	CONFIG_NIOS2_DCACHE_SIZE
+
+#endif /* _ASM_NIOS2_SHMPARAM_H */

arch/nios2/mm/cacheflush.c

@@ -128,12 +128,14 @@ void flush_cache_dup_mm(struct mm_struct *mm)
 
 void flush_icache_range(unsigned long start, unsigned long end)
 {
+	__flush_dcache(start, end);
 	__flush_icache(start, end);
 }
 
 void flush_dcache_range(unsigned long start, unsigned long end)
 {
 	__flush_dcache(start, end);
+	__flush_icache(start, end);
 }
 EXPORT_SYMBOL(flush_dcache_range);
 
@@ -156,6 +158,7 @@ void flush_icache_page(struct vm_area_struct *vma, struct page *page)
 	unsigned long start = (unsigned long) page_address(page);
 	unsigned long end = start + PAGE_SIZE;
 
+	__flush_dcache(start, end);
 	__flush_icache(start, end);
 }
 
@@ -170,6 +173,18 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr,
 		__flush_icache(start, end);
 }
 
+void __flush_dcache_page(struct address_space *mapping, struct page *page)
+{
+	/*
+	 * Writeback any data associated with the kernel mapping of this
+	 * page.  This ensures that data in the physical page is mutually
+	 * coherent with the kernels mapping.
+	 */
+	unsigned long start = (unsigned long)page_address(page);
+
+	__flush_dcache_all(start, start + PAGE_SIZE);
+}
+
 void flush_dcache_page(struct page *page)
 {
 	struct address_space *mapping;
@@ -187,11 +202,12 @@ void flush_dcache_page(struct page *page)
 	if (mapping && !mapping_mapped(mapping)) {
 		clear_bit(PG_dcache_clean, &page->flags);
 	} else {
+		__flush_dcache_page(mapping, page);
+		if (mapping) {
 			unsigned long start = (unsigned long)page_address(page);
-
-		__flush_dcache_all(start, start + PAGE_SIZE);
-		if (mapping)
 			flush_aliases(mapping,  page);
+			flush_icache_range(start, start + PAGE_SIZE);
+		}
 		set_bit(PG_dcache_clean, &page->flags);
 	}
 }
@@ -202,6 +218,7 @@ void update_mmu_cache(struct vm_area_struct *vma,
 {
 	unsigned long pfn = pte_pfn(*pte);
 	struct page *page;
+	struct address_space *mapping;
 
 	if (!pfn_valid(pfn))
 		return;
@@ -214,16 +231,15 @@ void update_mmu_cache(struct vm_area_struct *vma,
 	if (page == ZERO_PAGE(0))
 		return;
 
-	if (!PageReserved(page) &&
-	     !test_and_set_bit(PG_dcache_clean, &page->flags)) {
-		unsigned long start = page_to_virt(page);
-		struct address_space *mapping;
-
-		__flush_dcache(start, start + PAGE_SIZE);
-
 	mapping = page_mapping(page);
-		if (mapping)
+	if (!test_and_set_bit(PG_dcache_clean, &page->flags))
+		__flush_dcache_page(mapping, page);
+
+	if(mapping)
+	{
 		flush_aliases(mapping, page);
+		if (vma->vm_flags & VM_EXEC)
+			flush_icache_page(vma, page);
 	}
 }
 
@@ -231,15 +247,19 @@ void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
 		    struct page *to)
 {
 	__flush_dcache(vaddr, vaddr + PAGE_SIZE);
+	__flush_icache(vaddr, vaddr + PAGE_SIZE);
 	copy_page(vto, vfrom);
 	__flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
+	__flush_icache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
 }
 
 void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
 {
 	__flush_dcache(vaddr, vaddr + PAGE_SIZE);
+	__flush_icache(vaddr, vaddr + PAGE_SIZE);
 	clear_page(addr);
 	__flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
+	__flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
 }
 
 void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
@@ -248,7 +268,7 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
 {
 	flush_cache_page(vma, user_vaddr, page_to_pfn(page));
 	memcpy(dst, src, len);
-	__flush_dcache((unsigned long)src, (unsigned long)src + len);
+	__flush_dcache_all((unsigned long)src, (unsigned long)src + len);
 	if (vma->vm_flags & VM_EXEC)
 		__flush_icache((unsigned long)src, (unsigned long)src + len);
 }
@@ -259,7 +279,7 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 {
 	flush_cache_page(vma, user_vaddr, page_to_pfn(page));
 	memcpy(dst, src, len);
-	__flush_dcache((unsigned long)dst, (unsigned long)dst + len);
+	__flush_dcache_all((unsigned long)dst, (unsigned long)dst + len);
 	if (vma->vm_flags & VM_EXEC)
 		__flush_icache((unsigned long)dst, (unsigned long)dst + len);
 }