powerpc: Use enhanced touch instructions in POWER7 copy_to_user/copy_from_user

Version 2.06 of the POWER ISA introduced enhanced touch instructions,
allowing us to specify a number of attributes including the length of
a stream.

This patch adds a software stream for both loads and stores in the
POWER7 copy_tofrom_user loop. Since the setup is quite complicated
and we have to use an eieio to ensure correct ordering of the "GO"
command we only do this for copies above 4kB.

To quantify any performance improvements we need a working set
bigger than the caches so we operate on a 1GB file:

# dd if=/dev/zero of=/tmp/foo bs=1M count=1024

And we compare how fast we can read the file:

# dd if=/tmp/foo of=/dev/null bs=1M

before: 7.7 GB/s
after:  9.6 GB/s

A 25% improvement.

The worst case for this patch will be a completely L1 cache contained
copy of just over 4kB. We can test this with the copy_to_user
testcase we used to tune copy_tofrom_user originally:

http://ozlabs.org/~anton/junkcode/copy_to_user.c

# time ./copy_to_user2 -l 4224 -i 10000000

before: 6.807 s
after:  6.946 s

A 2% slowdown, which seems reasonable considering our data is unlikely
to be completely L1 contained.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/lib/copyuser_power7.S b/arch/powerpc/lib/copyuser_power7.S
index 497db7b..9c982cd 100644 (file)
--- a/arch/powerpc/lib/copyuser_power7.S
+++ b/arch/powerpc/lib/copyuser_power7.S
@@ -298,6 +298,37 @@ err1;      stb     r0,0(r3)
        ld      r5,STACKFRAMESIZE+64(r1)
        mtlr    r0
 
+       /*
+        * We prefetch both the source and destination using enhanced touch
+        * instructions. We use a stream ID of 0 for the load side and
+        * 1 for the store side.
+        */
+       clrrdi  r6,r4,7
+       clrrdi  r9,r3,7
+       ori     r9,r9,1         /* stream=1 */
+
+       srdi    r7,r5,7         /* length in cachelines, capped at 0x3FF */
+       cmpldi  r7,0x3FF
+       ble     1f
+       li      r7,0x3FF
+1:     lis     r0,0x0E00       /* depth=7 */
+       sldi    r7,r7,7
+       or      r7,r7,r0
+       ori     r10,r7,1        /* stream=1 */
+
+       lis     r8,0x8000       /* GO=1 */
+       clrldi  r8,r8,32
+
+.machine push
+.machine "power4"
+       dcbt    r0,r6,0b01000
+       dcbt    r0,r7,0b01010
+       dcbtst  r0,r9,0b01000
+       dcbtst  r0,r10,0b01010
+       eieio
+       dcbt    r0,r8,0b01010   /* GO */
+.machine pop
+
        beq     .Lunwind_stack_nonvmx_copy
 
        /*