lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[PATCH] ARM: Add V6 aliasing cache flush

Browse Source 
Add cache flushing support for aliased V6 caches to
flush_dcache_page.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
This commit is contained in:
Russell King
2005-05-10 17:31:43 +01:00
parent 08ee4e4c5f
commit 8d802d28c2
1 changed files with 35 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
arch/arm/mm/flush.c
View File

@@ -13,6 +13,29 @@
#include <asm/cacheflush.h> #include <asm/cacheflush.h>
#include <asm/system.h> #include <asm/system.h>
#include <asm/tlbflush.h>
#ifdef CONFIG_CPU_CACHE_VIPT
#define ALIAS_FLUSH_START 0xffff4000
#define TOP_PTE(x) pte_offset_kernel(top_pmd, x)
static void flush_pfn_alias(unsigned long pfn, unsigned long vaddr)
{
unsigned long to = ALIAS_FLUSH_START + (CACHE_COLOUR(vaddr) << PAGE_SHIFT);
set_pte(TOP_PTE(to), pfn_pte(pfn, PAGE_KERNEL));
flush_tlb_kernel_page(to);
asm( "mcrr p15, 0, %1, %0, c14\n"
" mcrr p15, 0, %1, %0, c5\n"
:
: "r" (to), "r" (to + PAGE_SIZE - L1_CACHE_BYTES)
: "cc");
}
#else
#define flush_pfn_alias(pfn,vaddr) do { } while (0)
#endif
static void __flush_dcache_page(struct address_space *mapping, struct page *page) static void __flush_dcache_page(struct address_space *mapping, struct page *page)
{ {
@@ -36,6 +59,18 @@ static void __flush_dcache_page(struct address_space *mapping, struct page *page
if (!mapping) if (!mapping)
return; return;
/*
* This is a page cache page. If we have a VIPT cache, we
* only need to do one flush - which would be at the relevant
* userspace colour, which is congruent with page->index.
*/
if (cache_is_vipt()) {
if (cache_is_vipt_aliasing())
flush_pfn_alias(page_to_pfn(page),
page->index << PAGE_CACHE_SHIFT);
return;
}
/* /*
* There are possible user space mappings of this page: * There are possible user space mappings of this page:
* - VIVT cache: we need to also write back and invalidate all user * - VIVT cache: we need to also write back and invalidate all user
@@ -57,8 +92,6 @@ static void __flush_dcache_page(struct address_space *mapping, struct page *page
continue; continue;
offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
flush_cache_page(mpnt, mpnt->vm_start + offset, page_to_pfn(page)); flush_cache_page(mpnt, mpnt->vm_start + offset, page_to_pfn(page));
if (cache_is_vipt())
break;
} }
flush_dcache_mmap_unlock(mapping); flush_dcache_mmap_unlock(mapping);
} }