Commit 146c9ab3 authored by Sayali Patil's avatar Sayali Patil Committed by Madhavan Srinivasan
Browse files

powerpc/selftests/copyloops: extend selftest to exercise __copy_tofrom_user_power7_vmx 



The new PowerPC VMX fast path (__copy_tofrom_user_power7_vmx) is not
exercised by existing copyloops selftests. This patch updates
the selftest to exercise the VMX variant, ensuring the VMX copy path
is validated.

Changes include:
  - COPY_LOOP=test___copy_tofrom_user_power7_vmx with -D VMX_TEST is used
    in existing selftest build targets.
  - Inclusion of ../utils.c to provide get_auxv_entry() for hardware
    feature detection.
  - At runtime, the test skips execution if Altivec is not available.
  - Copy sizes above VMX_COPY_THRESHOLD are used to ensure the VMX
    path is taken.

This enables validation of the VMX fast path without affecting systems
that do not support Altivec.

Signed-off-by: default avatarSayali Patil <sayalip@linux.ibm.com>
Tested-by: default avatarVenkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260304122201.153049-2-sayalip@linux.ibm.com
parent 6bc9c0a9

tools/testing/selftests/powerpc/copyloops/.gitignore

+2 −2
Original line number Diff line number Diff line
@@ -2,8 +2,8 @@ 
copyuser_64_t0

copyuser_64_t1

copyuser_64_t2

copyuser_p7_t0

copyuser_p7_t1

copyuser_p7

copyuser_p7_vmx

memcpy_64_t0

memcpy_64_t1

memcpy_64_t2

tools/testing/selftests/powerpc/copyloops/Makefile

+8 −3
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

TEST_GEN_PROGS := copyuser_64_t0 copyuser_64_t1 copyuser_64_t2 \

		copyuser_p7_t0 copyuser_p7_t1 \

		copyuser_p7 copyuser_p7_vmx \

		memcpy_64_t0 memcpy_64_t1 memcpy_64_t2 \

		memcpy_p7_t0 memcpy_p7_t1 copy_mc_64 \

		copyuser_64_exc_t0 copyuser_64_exc_t1 copyuser_64_exc_t2 \
@@ -28,10 +28,15 @@ $(OUTPUT)/copyuser_64_t%: copyuser_64.S $(EXTRA_SOURCES) 
		-D SELFTEST_CASE=$(subst copyuser_64_t,,$(notdir $@)) \

		-o $@ $^



$(OUTPUT)/copyuser_p7_t%:	copyuser_power7.S $(EXTRA_SOURCES)

$(OUTPUT)/copyuser_p7:	copyuser_power7.S $(EXTRA_SOURCES)

	$(CC) $(CPPFLAGS) $(CFLAGS) \

		-D COPY_LOOP=test___copy_tofrom_user_power7 \

		-D SELFTEST_CASE=$(subst copyuser_p7_t,,$(notdir $@)) \

		-o $@ $^



$(OUTPUT)/copyuser_p7_vmx:       copyuser_power7.S $(EXTRA_SOURCES) ../utils.c

	$(CC) $(CPPFLAGS) $(CFLAGS) \

		-D COPY_LOOP=test___copy_tofrom_user_power7_vmx \

		-D VMX_TEST \

		-o $@ $^



# Strictly speaking, we only need the memcpy_64 test cases for big-endian

tools/testing/selftests/powerpc/copyloops/stubs.S

+0 −8
Original line number Diff line number Diff line 
#include <asm/ppc_asm.h>



FUNC_START(enter_vmx_usercopy)

	li	r3,1

	blr



FUNC_START(exit_vmx_usercopy)

	li	r3,0

	blr



FUNC_START(enter_vmx_ops)

	li	r3,1

	blr

tools/testing/selftests/powerpc/copyloops/validate.c

+14 −1
Original line number Diff line number Diff line
@@ -12,6 +12,10 @@ 
#define BUFLEN (MAX_LEN+MAX_OFFSET+2*MIN_REDZONE)

#define POISON 0xa5



#ifdef VMX_TEST

#define VMX_COPY_THRESHOLD 3328

#endif



unsigned long COPY_LOOP(void *to, const void *from, unsigned long size);



static void do_one(char *src, char *dst, unsigned long src_off,
@@ -81,8 +85,12 @@ int test_copy_loop(void) 
	/* Fill with sequential bytes */

	for (i = 0; i < BUFLEN; i++)

		fill[i] = i & 0xff;



#ifdef VMX_TEST

	/* Force sizes above kernel VMX threshold (3328) */

	for (len = VMX_COPY_THRESHOLD + 1; len < MAX_LEN; len++) {

#else

	for (len = 1; len < MAX_LEN; len++) {

#endif

		for (src_off = 0; src_off < MAX_OFFSET; src_off++) {

			for (dst_off = 0; dst_off < MAX_OFFSET; dst_off++) {

				do_one(src, dst, src_off, dst_off, len,
@@ -96,5 +104,10 @@ int test_copy_loop(void) 


int main(void)

{

#ifdef VMX_TEST

	/* Skip if Altivec not present */

	SKIP_IF_MSG(!have_hwcap(PPC_FEATURE_HAS_ALTIVEC), "ALTIVEC not supported");

#endif



	return test_harness(test_copy_loop, str(COPY_LOOP));

}