[RFC PATCH v2 3/5] ARM: kernel: update cpu_suspend code to use cache LoUIS operations

[Will Deacon]

On Tue, Dec 11, 2012 at 11:27:39PM +0000, Stephen Boyd wrote:
> On 12/11/12 08:38, Will Deacon wrote:
> > diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
> > index cd95664..f58248f 100644
> > --- a/arch/arm/mm/cache-v7.S
> > +++ b/arch/arm/mm/cache-v7.S
> > @@ -44,7 +44,8 @@ ENDPROC(v7_flush_icache_all)
> >  ENTRY(v7_flush_dcache_louis)
> >         dmb                                     @ ensure ordering with previous memory accesses
> >         mrc     p15, 1, r0, c0, c0, 1           @ read clidr, r0 = clidr
> > -       ands    r3, r0, #0xe00000               @ extract LoUIS from clidr
> > +       ALT_SMP(ands    r3, r0, #(7 << 21))     @ extract LoUIS from clidr
> > +       ALT_UP(ands     r3, r0, #(7 << 27))     @ extract LoUU from clidr
> >         mov     r3, r3, lsr #20                 @ r3 = LoUIS * 2
> 
> You need to fix this mov as well, right?

Ha, nice catch. So the original patch ended up with a ridiculously high
level number and would've flushed L2, hence we will need to retest with the
fix below...

Will

--->8

diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
index cd95664..7539ec2 100644
--- a/arch/arm/mm/cache-v7.S
+++ b/arch/arm/mm/cache-v7.S
@@ -44,8 +44,10 @@ ENDPROC(v7_flush_icache_all)
 ENTRY(v7_flush_dcache_louis)
        dmb                                     @ ensure ordering with previous memory accesses
        mrc     p15, 1, r0, c0, c0, 1           @ read clidr, r0 = clidr
-       ands    r3, r0, #0xe00000               @ extract LoUIS from clidr
-       mov     r3, r3, lsr #20                 @ r3 = LoUIS * 2
+       ALT_SMP(ands    r3, r0, #(7 << 21))     @ extract LoUIS from clidr
+       ALT_UP(ands     r3, r0, #(7 << 27))     @ extract LoUU from clidr
+       ALT_SMP(mov     r3, r3, lsr #20)        @ r3 = LoUIS * 2
+       ALT_UP(mov      r3, r3, lsr #26)        @ r3 = LoUU * 2
        moveq   pc, lr                          @ return if level == 0
        mov     r10, #0                         @ r10 (starting level) = 0
        b       flush_levels                    @ start flushing cache levels