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Commit 55661fc1 authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Assume new page cache pages have dirty dcache lines. 



This follows the ARM change c0177800
("ARM: 6379/1: Assume new page cache pages have dirty D-cache") for the
same rationale:

    There are places in Linux where writes to newly allocated page
    cache pages happen without a subsequent call to flush_dcache_page()
    (several PIO drivers including USB HCD). This patch changes the
    meaning of PG_arch_1 to be PG_dcache_clean and always flush the
    D-cache for a newly mapped page in update_mmu_cache().

This addresses issues seen with executing binaries from MMC, in
addition to some of the other HCDs that don't explicitly do cache
management for their pipe-in buffers.

Requested-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 22a5b566

arch/sh/include/asm/cacheflush.h

+1 −1
Original line number Diff line number Diff line
@@ -96,7 +96,7 @@ void kmap_coherent_init(void); 
void *kmap_coherent(struct page *page, unsigned long addr);

void kunmap_coherent(void *kvaddr);



#define PG_dcache_dirty	PG_arch_1

#define PG_dcache_clean	PG_arch_1



void cpu_cache_init(void);

arch/sh/mm/cache-sh4.c

+2 −2
Original line number Diff line number Diff line
@@ -114,7 +114,7 @@ static void sh4_flush_dcache_page(void *arg) 
	struct address_space *mapping = page_mapping(page);



	if (mapping && !mapping_mapped(mapping))

		set_bit(PG_dcache_dirty, &page->flags);

		clear_bit(PG_dcache_clean, &page->flags);

	else

#endif

		flush_cache_one(CACHE_OC_ADDRESS_ARRAY |
@@ -239,7 +239,7 @@ static void sh4_flush_cache_page(void *args) 
		 * another ASID than the current one.

		 */

		map_coherent = (current_cpu_data.dcache.n_aliases &&

			!test_bit(PG_dcache_dirty, &page->flags) &&

			test_bit(PG_dcache_clean, &page->flags) &&

			page_mapped(page));

		if (map_coherent)

			vaddr = kmap_coherent(page, address);

arch/sh/mm/cache-sh7705.c

+1 −1
Original line number Diff line number Diff line
@@ -139,7 +139,7 @@ static void sh7705_flush_dcache_page(void *arg) 
	struct address_space *mapping = page_mapping(page);



	if (mapping && !mapping_mapped(mapping))

		set_bit(PG_dcache_dirty, &page->flags);

		clear_bit(PG_dcache_clean, &page->flags);

	else

		__flush_dcache_page(__pa(page_address(page)));

}

arch/sh/mm/cache.c

+7 −7
Original line number Diff line number Diff line
@@ -60,14 +60,14 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 
		       unsigned long len)

{

	if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&

	    !test_bit(PG_dcache_dirty, &page->flags)) {

	    test_bit(PG_dcache_clean, &page->flags)) {

		void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);

		memcpy(vto, src, len);

		kunmap_coherent(vto);

	} else {

		memcpy(dst, src, len);

		if (boot_cpu_data.dcache.n_aliases)

			set_bit(PG_dcache_dirty, &page->flags);

			clear_bit(PG_dcache_clean, &page->flags);

	}



	if (vma->vm_flags & VM_EXEC)
@@ -79,14 +79,14 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page, 
			 unsigned long len)

{

	if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&

	    !test_bit(PG_dcache_dirty, &page->flags)) {

	    test_bit(PG_dcache_clean, &page->flags)) {

		void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);

		memcpy(dst, vfrom, len);

		kunmap_coherent(vfrom);

	} else {

		memcpy(dst, src, len);

		if (boot_cpu_data.dcache.n_aliases)

			set_bit(PG_dcache_dirty, &page->flags);

			clear_bit(PG_dcache_clean, &page->flags);

	}

}
@@ -98,7 +98,7 @@ void copy_user_highpage(struct page *to, struct page *from, 
	vto = kmap_atomic(to, KM_USER1);



	if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&

	    !test_bit(PG_dcache_dirty, &from->flags)) {

	    test_bit(PG_dcache_clean, &from->flags)) {

		vfrom = kmap_coherent(from, vaddr);

		copy_page(vto, vfrom);

		kunmap_coherent(vfrom);
@@ -141,7 +141,7 @@ void __update_cache(struct vm_area_struct *vma, 


	page = pfn_to_page(pfn);

	if (pfn_valid(pfn)) {

		int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);

		int dirty = !test_and_set_bit(PG_dcache_clean, &page->flags);

		if (dirty)

			__flush_purge_region(page_address(page), PAGE_SIZE);

	}
@@ -153,7 +153,7 @@ void __flush_anon_page(struct page *page, unsigned long vmaddr) 


	if (pages_do_alias(addr, vmaddr)) {

		if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&

		    !test_bit(PG_dcache_dirty, &page->flags)) {

		    test_bit(PG_dcache_clean, &page->flags)) {

			void *kaddr;



			kaddr = kmap_coherent(page, vmaddr);

arch/sh/mm/kmap.c

+1 −1
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ void *kmap_coherent(struct page *page, unsigned long addr) 
	enum fixed_addresses idx;

	unsigned long vaddr;



	BUG_ON(test_bit(PG_dcache_dirty, &page->flags));

	BUG_ON(!test_bit(PG_dcache_clean, &page->flags));



	pagefault_disable();