Ritesh Harjani <rite...@linux.ibm.com> writes:
> While debugging an issue, we wanted to check whether the arch specific
> kernel memmove implementation is correct. This selftest could help test that.
>
> Suggested-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com>
> Suggested-by: Vaibhav Jain <vaib...@linux.ibm.com>
> Signed-off-by: Ritesh Harjani <rite...@linux.ibm.com>
> ---
> tools/testing/selftests/powerpc/Makefile | 1 +
> .../selftests/powerpc/memmoveloop/.gitignore | 2 +
> .../selftests/powerpc/memmoveloop/Makefile | 19 +++++++
> .../powerpc/memmoveloop/asm/asm-compat.h | 0
> .../powerpc/memmoveloop/asm/export.h | 4 ++
> .../powerpc/memmoveloop/asm/feature-fixups.h | 0
> .../selftests/powerpc/memmoveloop/asm/kasan.h | 0
> .../powerpc/memmoveloop/asm/ppc_asm.h | 39 +++++++++++++
> .../powerpc/memmoveloop/asm/processor.h | 0
> .../selftests/powerpc/memmoveloop/mem_64.S | 1 +
> .../selftests/powerpc/memmoveloop/memcpy_64.S | 1 +
> .../selftests/powerpc/memmoveloop/stubs.S | 8 +++
> .../selftests/powerpc/memmoveloop/validate.c | 56 +++++++++++++++++++
> 13 files changed, 131 insertions(+)
> create mode 100644 tools/testing/selftests/powerpc/memmoveloop/.gitignore
> create mode 100644 tools/testing/selftests/powerpc/memmoveloop/Makefile
> create mode 100644
> tools/testing/selftests/powerpc/memmoveloop/asm/asm-compat.h
> create mode 100644 tools/testing/selftests/powerpc/memmoveloop/asm/export.h
> create mode 100644
> tools/testing/selftests/powerpc/memmoveloop/asm/feature-fixups.h
> create mode 100644 tools/testing/selftests/powerpc/memmoveloop/asm/kasan.h
> create mode 100644 tools/testing/selftests/powerpc/memmoveloop/asm/ppc_asm.h
> create mode 100644
> tools/testing/selftests/powerpc/memmoveloop/asm/processor.h
> create mode 120000 tools/testing/selftests/powerpc/memmoveloop/mem_64.S
> create mode 120000 tools/testing/selftests/powerpc/memmoveloop/memcpy_64.S
> create mode 100644 tools/testing/selftests/powerpc/memmoveloop/stubs.S
> create mode 100644 tools/testing/selftests/powerpc/memmoveloop/validate.c
You've copied a lot of tools/testing/selftests/powerpc/copyloops
I'd be happier if you integrated the memmove test into that existing
code. I realise memmove is not technically a copy loop, but it's close
enough.
Did you try that and hit some roadblock?
cheers
> diff --git a/tools/testing/selftests/powerpc/Makefile
> b/tools/testing/selftests/powerpc/Makefile
> index 0830e63818c1..d110b3e5cbcd 100644
> --- a/tools/testing/selftests/powerpc/Makefile
> +++ b/tools/testing/selftests/powerpc/Makefile
> @@ -16,6 +16,7 @@ export CFLAGS
> SUB_DIRS = alignment \
> benchmarks \
> cache_shape \
> + memmoveloop \
> copyloops \
> dscr \
> mm \
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/.gitignore
> b/tools/testing/selftests/powerpc/memmoveloop/.gitignore
> new file mode 100644
> index 000000000000..56c1426013d5
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/.gitignore
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +memmove_64
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/Makefile
> b/tools/testing/selftests/powerpc/memmoveloop/Makefile
> new file mode 100644
> index 000000000000..d58d8c100099
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/Makefile
> @@ -0,0 +1,19 @@
> +# SPDX-License-Identifier: GPL-2.0
> +CFLAGS += -m64
> +CFLAGS += -I$(CURDIR)
> +CFLAGS += -D SELFTEST
> +CFLAGS += -maltivec
> +
> +ASFLAGS = $(CFLAGS) -Wa,-mpower4
> +
> +TEST_GEN_PROGS := memmove_64
> +EXTRA_SOURCES := validate.c ../harness.c stubs.S
> +CPPFLAGS += -D TEST_MEMMOVE=test_memmove
> +
> +top_srcdir = ../../../../..
> +include ../../lib.mk
> +
> +$(OUTPUT)/memmove_64: mem_64.S memcpy_64.S $(EXTRA_SOURCES)
> + $(CC) $(CPPFLAGS) $(CFLAGS) \
> + -D TEST_MEMMOVE=test_memmove \
> + -o $@ $^
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/asm/asm-compat.h
> b/tools/testing/selftests/powerpc/memmoveloop/asm/asm-compat.h
> new file mode 100644
> index 000000000000..e69de29bb2d1
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/asm/export.h
> b/tools/testing/selftests/powerpc/memmoveloop/asm/export.h
> new file mode 100644
> index 000000000000..e6b80d5fbd14
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/asm/export.h
> @@ -0,0 +1,4 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#define EXPORT_SYMBOL(x)
> +#define EXPORT_SYMBOL_GPL(x)
> +#define EXPORT_SYMBOL_KASAN(x)
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/asm/feature-fixups.h
> b/tools/testing/selftests/powerpc/memmoveloop/asm/feature-fixups.h
> new file mode 100644
> index 000000000000..e69de29bb2d1
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/asm/kasan.h
> b/tools/testing/selftests/powerpc/memmoveloop/asm/kasan.h
> new file mode 100644
> index 000000000000..e69de29bb2d1
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/asm/ppc_asm.h
> b/tools/testing/selftests/powerpc/memmoveloop/asm/ppc_asm.h
> new file mode 100644
> index 000000000000..117005c56e19
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/asm/ppc_asm.h
> @@ -0,0 +1,39 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __SELFTESTS_POWERPC_PPC_ASM_H
> +#define __SELFTESTS_POWERPC_PPC_ASM_H
> +#include <ppc-asm.h>
> +
> +#define CONFIG_ALTIVEC
> +
> +#define r1 1
> +
> +#define R14 r14
> +#define R15 r15
> +#define R16 r16
> +#define R17 r17
> +#define R18 r18
> +#define R19 r19
> +#define R20 r20
> +#define R21 r21
> +#define R22 r22
> +#define R29 r29
> +#define R30 r30
> +#define R31 r31
> +
> +#define STACKFRAMESIZE 256
> +#define STK_REG(i) (112 + ((i)-14)*8)
> +
> +#define _GLOBAL(A) FUNC_START(test_ ## A)
> +#define _GLOBAL_TOC(A) _GLOBAL(A)
> +#define _GLOBAL_TOC_KASAN(A) _GLOBAL(A)
> +#define _GLOBAL_KASAN(A) _GLOBAL(A)
> +
> +#define PPC_MTOCRF(A, B) mtocrf A, B
> +
> +#define BEGIN_FTR_SECTION
> +#define FTR_SECTION_ELSE
> +#define ALT_FTR_SECTION_END_IFCLR(x)
> +#define ALT_FTR_SECTION_END(x, y)
> +#define END_FTR_SECTION_IFCLR(x)
> +
> +#endif /* __SELFTESTS_POWERPC_PPC_ASM_H */
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/asm/processor.h
> b/tools/testing/selftests/powerpc/memmoveloop/asm/processor.h
> new file mode 100644
> index 000000000000..e69de29bb2d1
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/mem_64.S
> b/tools/testing/selftests/powerpc/memmoveloop/mem_64.S
> new file mode 120000
> index 000000000000..db254c9a5f5c
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/mem_64.S
> @@ -0,0 +1 @@
> +../../../../../arch/powerpc/lib/mem_64.S
> \ No newline at end of file
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/memcpy_64.S
> b/tools/testing/selftests/powerpc/memmoveloop/memcpy_64.S
> new file mode 120000
> index 000000000000..cce33fb6f9d8
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/memcpy_64.S
> @@ -0,0 +1 @@
> +../../../../../arch/powerpc/lib/memcpy_64.S
> \ No newline at end of file
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/stubs.S
> b/tools/testing/selftests/powerpc/memmoveloop/stubs.S
> new file mode 100644
> index 000000000000..d9baa832fa49
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/stubs.S
> @@ -0,0 +1,8 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#include <asm/ppc_asm.h>
> +
> +FUNC_START(memcpy)
> + b test_memcpy
> +
> +FUNC_START(backwards_memcpy)
> + b test_backwards_memcpy
> diff --git a/tools/testing/selftests/powerpc/memmoveloop/validate.c
> b/tools/testing/selftests/powerpc/memmoveloop/validate.c
> new file mode 100644
> index 000000000000..52f7d32bb3fe
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/memmoveloop/validate.c
> @@ -0,0 +1,56 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <malloc.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <assert.h>
> +#include "utils.h"
> +
> +void *TEST_MEMMOVE(const void *s1, const void *s2, size_t n);
> +
> +#define BUF_LEN 65536
> +#define MAX_OFFSET 512
> +
> +size_t max(size_t a, size_t b)
> +{
> + if (a >= b) return a;
> + return b;
> +}
> +
> +static int testcase_run(void)
> +{
> + size_t i, src_off, dst_off, len;
> +
> + char *usermap = memalign(BUF_LEN, BUF_LEN);
> + char *kernelmap = memalign(BUF_LEN, BUF_LEN);
> +
> + assert(usermap != NULL);
> + assert(kernelmap != NULL);
> +
> + memset(usermap, 0, BUF_LEN);
> + memset(kernelmap, 0, BUF_LEN);
> +
> + for (i = 0; i < BUF_LEN; i++) {
> + usermap[i] = i & 0xff;
> + kernelmap[i] = i & 0xff;
> + }
> +
> + for (src_off = 0; src_off < MAX_OFFSET; src_off++) {
> + for (dst_off = 0; dst_off < MAX_OFFSET; dst_off++) {
> + for (len = 1; len < MAX_OFFSET - max(src_off, dst_off);
> len++) {
> +
> + memmove(usermap + dst_off, usermap + src_off,
> len);
> + TEST_MEMMOVE(kernelmap + dst_off, kernelmap +
> src_off, len);
> + if (memcmp(usermap, kernelmap, MAX_OFFSET) !=
> 0) {
> + printf("memmove failed at %ld %ld
> %ld\n", src_off, dst_off, len);
> + abort();
> + }
> + }
> + }
> + }
> + return 0;
> +}
> +
> +int main(void)
> +{
> + return test_harness(testcase_run, "memmove");
> +}
> --
> 2.31.1
