ARM: 8055/1: cacheflush: use -st dsb option for ensuring completion

wildea01 · Russell King · commit 9581960a40ab · 2014-05-25T23:47:46.000+01:00
dsb st can be used to ensure completion of pending cache maintenance
operations, so use it for the v7 cache maintenance operations.

Signed-off-by: Will Deacon &lt;will.deacon@arm.com&gt;
Signed-off-by: Russell King &lt;rmk+kernel@arm.linux.org.uk&gt;
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
@@ -212,7 +212,7 @@ extern void copy_to_user_page(struct vm_area_struct *, struct page *,
 static inline void __flush_icache_all(void)
 {
 	__flush_icache_preferred();
-	dsb();
+	dsb(ishst);
 }
 
 /*
diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
@@ -59,7 +59,7 @@ ENTRY(v7_invalidate_l1)
        bgt     2b
        cmp     r2, #0
        bgt     1b
-       dsb
+       dsb     st
        isb
        mov     pc, lr
 ENDPROC(v7_invalidate_l1)
@@ -166,7 +166,7 @@ skip:
 finished:
 	mov	r10, #0				@ swith back to cache level 0
 	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
-	dsb
+	dsb	st
 	isb
 	mov	pc, lr
 ENDPROC(v7_flush_dcache_all)
@@ -335,7 +335,7 @@ ENTRY(v7_flush_kern_dcache_area)
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
-	dsb
+	dsb	st
 	mov	pc, lr
 ENDPROC(v7_flush_kern_dcache_area)
 
@@ -368,7 +368,7 @@ v7_dma_inv_range:
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
-	dsb
+	dsb	st
 	mov	pc, lr
 ENDPROC(v7_dma_inv_range)
 
@@ -390,7 +390,7 @@ v7_dma_clean_range:
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
-	dsb
+	dsb	st
 	mov	pc, lr
 ENDPROC(v7_dma_clean_range)
 
@@ -412,7 +412,7 @@ ENTRY(v7_dma_flush_range)
 	add	r0, r0, r2
 	cmp	r0, r1
 	blo	1b
-	dsb
+	dsb	st
 	mov	pc, lr
 ENDPROC(v7_dma_flush_range)
 
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
@@ -1465,7 +1465,7 @@ void __init early_paging_init(const struct machine_desc *mdesc,
 	 * just complicate the code.
 	 */
 	flush_cache_louis();
-	dsb();
+	dsb(ishst);
 	isb();
 
 	/* remap level 1 table */

Original file line number	Diff line number	Diff line change
`@@ -212,7 +212,7 @@ extern void copy_to_user_page(struct vm_area_struct , struct page ,`
`212`	`212`	`static inline void __flush_icache_all(void)`
`213`	`213`	`{`
`214`	`214`	`__flush_icache_preferred();`
`215`		`- dsb();`
	`215`	`+ dsb(ishst);`
`216`	`216`	`}`
`217`	`217`
`218`	`218`	`/*`