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Commit 8e3d7c83 authored by Ley Foon Tan's avatar Ley Foon Tan
Browse files

nios2: fix cache coherency 



There is intermittent cache coherency issue caught in toolchian tests.
Revert to use flushd.

Signed-off-by: default avatarLey Foon Tan <lftan@altera.com>
parent 1ec21837

arch/nios2/mm/cacheflush.c

+4 −20
Original line number Diff line number Diff line
@@ -23,22 +23,6 @@ static void __flush_dcache(unsigned long start, unsigned long end) 
	end += (cpuinfo.dcache_line_size - 1);

	end &= ~(cpuinfo.dcache_line_size - 1);



	for (addr = start; addr < end; addr += cpuinfo.dcache_line_size) {

		__asm__ __volatile__ ("   flushda 0(%0)\n"

					: /* Outputs */

					: /* Inputs  */ "r"(addr)

					/* : No clobber */);

	}

}



static void __flush_dcache_all(unsigned long start, unsigned long end)

{

	unsigned long addr;



	start &= ~(cpuinfo.dcache_line_size - 1);

	end += (cpuinfo.dcache_line_size - 1);

	end &= ~(cpuinfo.dcache_line_size - 1);



	if (end > start + cpuinfo.dcache_size)

		end = start + cpuinfo.dcache_size;
@@ -112,7 +96,7 @@ static void flush_aliases(struct address_space *mapping, struct page *page) 


void flush_cache_all(void)

{

	__flush_dcache_all(0, cpuinfo.dcache_size);

	__flush_dcache(0, cpuinfo.dcache_size);

	__flush_icache(0, cpuinfo.icache_size);

}
@@ -182,7 +166,7 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page) 
	 */

	unsigned long start = (unsigned long)page_address(page);



	__flush_dcache_all(start, start + PAGE_SIZE);

	__flush_dcache(start, start + PAGE_SIZE);

}



void flush_dcache_page(struct page *page)
@@ -268,7 +252,7 @@ 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_all((unsigned long)src, (unsigned long)src + len);

	__flush_dcache((unsigned long)src, (unsigned long)src + len);

	if (vma->vm_flags & VM_EXEC)

		__flush_icache((unsigned long)src, (unsigned long)src + len);

}
@@ -279,7 +263,7 @@ 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_all((unsigned long)dst, (unsigned long)dst + len);

	__flush_dcache((unsigned long)dst, (unsigned long)dst + len);

	if (vma->vm_flags & VM_EXEC)

		__flush_icache((unsigned long)dst, (unsigned long)dst + len);

}