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selftests/powerpc: Add matrix multiply assist (MMA) test

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Adds a simple test of some basic matrix multiply assist (MMA)
instructions.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200622021832.15870-1-alistair@popple.id.au
This commit is contained in:
Alistair Popple 2020-06-22 12:18:32 +10:00 committed by Michael Ellerman
parent 40a75584e5
commit 3527e1ab9a
4 changed files with 89 additions and 1 deletions
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5
tools/testing/selftests/powerpc/include/utils.h
View file

@ -135,6 +135,11 @@ do { \
#define PPC_FEATURE2_ARCH_3_1 0x00040000
#endif
/* POWER10 features */
#ifndef PPC_FEATURE2_MMA
#define PPC_FEATURE2_MMA 0x00020000
#endif
#if defined(__powerpc64__)
#define UCONTEXT_NIA(UC) (UC)->uc_mcontext.gp_regs[PT_NIP]
#define UCONTEXT_MSR(UC) (UC)->uc_mcontext.gp_regs[PT_MSR]

4
tools/testing/selftests/powerpc/math/Makefile
View file

@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
TEST_GEN_PROGS := fpu_syscall fpu_preempt fpu_signal fpu_denormal vmx_syscall vmx_preempt vmx_signal vsx_preempt
TEST_GEN_PROGS := fpu_syscall fpu_preempt fpu_signal fpu_denormal vmx_syscall vmx_preempt vmx_signal vsx_preempt mma
top_srcdir = ../../../../..
include ../../lib.mk
@ -17,3 +17,5 @@ $(OUTPUT)/vmx_signal: vmx_asm.S ../utils.c
$(OUTPUT)/vsx_preempt: CFLAGS += -mvsx
$(OUTPUT)/vsx_preempt: vsx_asm.S ../utils.c
$(OUTPUT)/mma: mma.c mma.S ../utils.c

33
tools/testing/selftests/powerpc/math/mma.S Normal file
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@ -0,0 +1,33 @@
/* SPDX-License-Identifier: GPL-2.0-or-later
*
* Test basic matrix multiply assist (MMA) functionality if available.
*
* Copyright 2020, Alistair Popple, IBM Corp.
*/
.global test_mma
test_mma:
/* Load accumulator via VSX registers from image passed in r3 */
lxvh8x 4,0,3
lxvh8x 5,0,4
/* Clear and prime the accumulator (xxsetaccz) */
.long 0x7c030162
/* Prime the accumulator with MMA VSX move to accumulator
* X-form (xxmtacc) (not needed due to above zeroing) */
//.long 0x7c010162
/* xvi16ger2s */
.long 0xec042958
/* Store result in image passed in r5 */
stxvw4x 0,0,5
addi 5,5,16
stxvw4x 1,0,5
addi 5,5,16
stxvw4x 2,0,5
addi 5,5,16
stxvw4x 3,0,5
addi 5,5,16
blr

48
tools/testing/selftests/powerpc/math/mma.c Normal file
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@ -0,0 +1,48 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Test basic matrix multiply assist (MMA) functionality if available.
*
* Copyright 2020, Alistair Popple, IBM Corp.
*/
#include <stdio.h>
#include <stdint.h>
#include "utils.h"
extern void test_mma(uint16_t (*)[8], uint16_t (*)[8], uint32_t (*)[4*4]);
static int mma(void)
{
int i;
int rc = 0;
uint16_t x[] = {1, 0, 2, 0, 3, 0, 4, 0};
uint16_t y[] = {1, 0, 2, 0, 3, 0, 4, 0};
uint32_t z[4*4];
uint32_t exp[4*4] = {1, 2, 3, 4,
2, 4, 6, 8,
3, 6, 9, 12,
4, 8, 12, 16};
SKIP_IF_MSG(!have_hwcap2(PPC_FEATURE2_ARCH_3_1), "Need ISAv3.1");
SKIP_IF_MSG(!have_hwcap2(PPC_FEATURE2_MMA), "Need MMA");
test_mma(&x, &y, &z);
for (i = 0; i < 16; i++) {
printf("MMA[%d] = %d ", i, z[i]);
if (z[i] == exp[i]) {
printf(" (Correct)\n");
} else {
printf(" (Incorrect)\n");
rc = 1;
}
}
return rc;
}
int main(int argc, char *argv[])
{
return test_harness(mma, "mma");
}