Commit 6abdd491 authored by Will Deacon's avatar Will Deacon
Browse files

ARM: mm: use inner-shareable barriers for TLB and user cache operations 



System-wide barriers aren't required for situations where we only need
to make visibility and ordering guarantees in the inner-shareable domain
(i.e. we are not dealing with devices or potentially incoherent CPUs).

This patch changes the v7 TLB operations, coherent_user_range and
dcache_clean_area functions to user inner-shareable barriers. For cache
maintenance, only the store access type is required to ensure completion.

Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 62cbbc42

arch/arm/mm/cache-v7.S

+2 −2
Original line number Diff line number Diff line
@@ -282,7 +282,7 @@ ENTRY(v7_coherent_user_range) 
	add	r12, r12, r2

	cmp	r12, r1

	blo	1b

	dsb

	dsb	ishst

	icache_line_size r2, r3

	sub	r3, r2, #1

	bic	r12, r0, r3
@@ -294,7 +294,7 @@ ENTRY(v7_coherent_user_range) 
	mov	r0, #0

	ALT_SMP(mcr	p15, 0, r0, c7, c1, 6)	@ invalidate BTB Inner Shareable

	ALT_UP(mcr	p15, 0, r0, c7, c5, 6)	@ invalidate BTB

	dsb

	dsb	ishst

	isb

	mov	pc, lr

arch/arm/mm/proc-v7.S

+1 −1
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ ENTRY(cpu_v7_dcache_clean_area) 
	add	r0, r0, r2

	subs	r1, r1, r2

	bhi	2b

	dsb

	dsb	ishst

	mov	pc, lr

ENDPROC(cpu_v7_dcache_clean_area)

arch/arm/mm/tlb-v7.S

+4 −4
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ 
ENTRY(v7wbi_flush_user_tlb_range)

	vma_vm_mm r3, r2			@ get vma->vm_mm

	mmid	r3, r3				@ get vm_mm->context.id

	dsb

	dsb	ish

	mov	r0, r0, lsr #PAGE_SHIFT		@ align address

	mov	r1, r1, lsr #PAGE_SHIFT

	asid	r3, r3				@ mask ASID
@@ -56,7 +56,7 @@ ENTRY(v7wbi_flush_user_tlb_range) 
	add	r0, r0, #PAGE_SZ

	cmp	r0, r1

	blo	1b

	dsb

	dsb	ish

	mov	pc, lr

ENDPROC(v7wbi_flush_user_tlb_range)
@@ -69,7 +69,7 @@ ENDPROC(v7wbi_flush_user_tlb_range) 
 *	- end   - end address (exclusive, may not be aligned)

 */

ENTRY(v7wbi_flush_kern_tlb_range)

	dsb

	dsb	ish

	mov	r0, r0, lsr #PAGE_SHIFT		@ align address

	mov	r1, r1, lsr #PAGE_SHIFT

	mov	r0, r0, lsl #PAGE_SHIFT
@@ -84,7 +84,7 @@ ENTRY(v7wbi_flush_kern_tlb_range) 
	add	r0, r0, #PAGE_SZ

	cmp	r0, r1

	blo	1b

	dsb

	dsb	ish

	isb

	mov	pc, lr

ENDPROC(v7wbi_flush_kern_tlb_range)

CRA Git | Maintained and supported by SUSTech CRA and CCSE