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SubjectRe: [RFC PATCH for 4.15 v3 14/22] cpu_opv: selftests: Implement selftests
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On 11/21/2017 07:18 AM, Mathieu Desnoyers wrote:
> Implement cpu_opv selftests. It needs to express dependencies on
> header files and .so, which require to override the selftests
> lib.mk targets. Introduce a new OVERRIDE_TARGETS define for this.
>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> CC: Russell King <linux@arm.linux.org.uk>
> CC: Catalin Marinas <catalin.marinas@arm.com>
> CC: Will Deacon <will.deacon@arm.com>
> CC: Thomas Gleixner <tglx@linutronix.de>
> CC: Paul Turner <pjt@google.com>
> CC: Andrew Hunter <ahh@google.com>
> CC: Peter Zijlstra <peterz@infradead.org>
> CC: Andy Lutomirski <luto@amacapital.net>
> CC: Andi Kleen <andi@firstfloor.org>
> CC: Dave Watson <davejwatson@fb.com>
> CC: Chris Lameter <cl@linux.com>
> CC: Ingo Molnar <mingo@redhat.com>
> CC: "H. Peter Anvin" <hpa@zytor.com>
> CC: Ben Maurer <bmaurer@fb.com>
> CC: Steven Rostedt <rostedt@goodmis.org>
> CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
> CC: Josh Triplett <josh@joshtriplett.org>
> CC: Linus Torvalds <torvalds@linux-foundation.org>
> CC: Andrew Morton <akpm@linux-foundation.org>
> CC: Boqun Feng <boqun.feng@gmail.com>
> CC: Shuah Khan <shuah@kernel.org>
> CC: linux-kselftest@vger.kernel.org
> CC: linux-api@vger.kernel.org
> ---
> Changes since v1:
>
> - Expose similar library API as rseq: Expose library API closely
> matching the rseq APIs, following removal of the event counter from
> the rseq kernel API.
> - Update makefile to fix make run_tests dependency on "all".
> - Introduce a OVERRIDE_TARGETS.
>
> Changes since v2:
>
> - Test page faults.
> ---
> MAINTAINERS | 1 +
> tools/testing/selftests/Makefile | 1 +
> tools/testing/selftests/cpu-opv/.gitignore | 1 +
> tools/testing/selftests/cpu-opv/Makefile | 17 +
> .../testing/selftests/cpu-opv/basic_cpu_opv_test.c | 1189 ++++++++++++++++++++
> tools/testing/selftests/cpu-opv/cpu-op.c | 348 ++++++
> tools/testing/selftests/cpu-opv/cpu-op.h | 68 ++
> tools/testing/selftests/lib.mk | 4 +

Please make the change to add OVERRIDE_TARGETS lib.mk a separate patch.
This is most likely going to be the first patch in this series.

> 8 files changed, 1629 insertions(+)
> create mode 100644 tools/testing/selftests/cpu-opv/.gitignore
> create mode 100644 tools/testing/selftests/cpu-opv/Makefile
> create mode 100644 tools/testing/selftests/cpu-opv/basic_cpu_opv_test.c
> create mode 100644 tools/testing/selftests/cpu-opv/cpu-op.c
> create mode 100644 tools/testing/selftests/cpu-opv/cpu-op.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0b4e504f5003..c6c2436d15f8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3734,6 +3734,7 @@ L: linux-kernel@vger.kernel.org
> S: Supported
> F: kernel/cpu_opv.c
> F: include/uapi/linux/cpu_opv.h
> +F: tools/testing/selftests/cpu-opv/
>
> CRAMFS FILESYSTEM
> M: Nicolas Pitre <nico@linaro.org>
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index eaf599dc2137..fc1eba0e0130 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -5,6 +5,7 @@ TARGETS += breakpoints
> TARGETS += capabilities
> TARGETS += cpufreq
> TARGETS += cpu-hotplug
> +TARGETS += cpu-opv
> TARGETS += efivarfs
> TARGETS += exec
> TARGETS += firmware
> diff --git a/tools/testing/selftests/cpu-opv/.gitignore b/tools/testing/selftests/cpu-opv/.gitignore
> new file mode 100644
> index 000000000000..c7186eb95cf5
> --- /dev/null
> +++ b/tools/testing/selftests/cpu-opv/.gitignore
> @@ -0,0 +1 @@
> +basic_cpu_opv_test
> diff --git a/tools/testing/selftests/cpu-opv/Makefile b/tools/testing/selftests/cpu-opv/Makefile
> new file mode 100644
> index 000000000000..21e63545d521
> --- /dev/null
> +++ b/tools/testing/selftests/cpu-opv/Makefile
> @@ -0,0 +1,17 @@
> +CFLAGS += -O2 -Wall -g -I./ -I../../../../usr/include/ -L./ -Wl,-rpath=./
> +
> +# Own dependencies because we only want to build against 1st prerequisite, but
> +# still track changes to header files and depend on shared object.
> +OVERRIDE_TARGETS = 1
> +
> +TEST_GEN_PROGS = basic_cpu_opv_test
> +
> +TEST_GEN_PROGS_EXTENDED = libcpu-op.so


> +
> +include ../lib.mk
> +
> +$(OUTPUT)/libcpu-op.so: cpu-op.c cpu-op.h
> + $(CC) $(CFLAGS) -shared -fPIC $< -o $@
> +
> +$(OUTPUT)/%: %.c $(TEST_GEN_PROGS_EXTENDED) cpu-op.h
> + $(CC) $(CFLAGS) $< -lcpu-op -o $@
> diff --git a/tools/testing/selftests/cpu-opv/basic_cpu_opv_test.c b/tools/testing/selftests/cpu-opv/basic_cpu_opv_test.c
> new file mode 100644
> index 000000000000..a31a10bbd8aa
> --- /dev/null
> +++ b/tools/testing/selftests/cpu-opv/basic_cpu_opv_test.c
> @@ -0,0 +1,1189 @@
> +/*
> + * Basic test coverage for cpu_opv system call.
> + */
> +
> +#define _GNU_SOURCE
> +#include <assert.h>
> +#include <sched.h>
> +#include <signal.h>
> +#include <stdio.h>
> +#include <string.h>
> +#include <sys/time.h>
> +#include <errno.h>
> +#include <stdlib.h>
> +
> +#include "cpu-op.h"
> +
> +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
> +
> +#define TESTBUFLEN 4096
> +#define TESTBUFLEN_CMP 16
> +
> +#define TESTBUFLEN_PAGE_MAX 65536
> +
> +#define NR_PF_ARRAY 16384
> +#define PF_ARRAY_LEN 4096
> +
> +/* 64 MB arrays for page fault testing. */
> +char pf_array_dst[NR_PF_ARRAY][PF_ARRAY_LEN];
> +char pf_array_src[NR_PF_ARRAY][PF_ARRAY_LEN];
> +
> +static int test_compare_eq_op(char *a, char *b, size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.a, a),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.b, b),
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_compare_eq_same(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN];
> + char buf2[TESTBUFLEN];
> + const char *test_name = "test_compare_eq same";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test compare_eq */
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf1[i] = (char)i;
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf2[i] = (char)i;
> + ret = test_compare_eq_op(buf2, buf1, TESTBUFLEN);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret > 0) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 0);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_compare_eq_diff(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN];
> + char buf2[TESTBUFLEN];
> + const char *test_name = "test_compare_eq different";
> +
> + printf("Testing %s\n", test_name);
> +
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf1[i] = (char)i;
> + memset(buf2, 0, TESTBUFLEN);
> + ret = test_compare_eq_op(buf2, buf1, TESTBUFLEN);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret == 0) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 1);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_compare_ne_op(char *a, char *b, size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_NE_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.a, a),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.b, b),
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_compare_ne_same(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN];
> + char buf2[TESTBUFLEN];
> + const char *test_name = "test_compare_ne same";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test compare_ne */
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf1[i] = (char)i;
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf2[i] = (char)i;
> + ret = test_compare_ne_op(buf2, buf1, TESTBUFLEN);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret == 0) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 1);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_compare_ne_diff(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN];
> + char buf2[TESTBUFLEN];
> + const char *test_name = "test_compare_ne different";
> +
> + printf("Testing %s\n", test_name);
> +
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf1[i] = (char)i;
> + memset(buf2, 0, TESTBUFLEN);
> + ret = test_compare_ne_op(buf2, buf1, TESTBUFLEN);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret != 0) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 0);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_2compare_eq_op(char *a, char *b, char *c, char *d,
> + size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.a, a),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.b, b),
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.a, c),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.b, d),
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_2compare_eq_index(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN_CMP];
> + char buf2[TESTBUFLEN_CMP];
> + char buf3[TESTBUFLEN_CMP];
> + char buf4[TESTBUFLEN_CMP];
> + const char *test_name = "test_2compare_eq index";
> +
> + printf("Testing %s\n", test_name);
> +
> + for (i = 0; i < TESTBUFLEN_CMP; i++)
> + buf1[i] = (char)i;
> + memset(buf2, 0, TESTBUFLEN_CMP);
> + memset(buf3, 0, TESTBUFLEN_CMP);
> + memset(buf4, 0, TESTBUFLEN_CMP);
> +
> + /* First compare failure is op[0], expect 1. */
> + ret = test_2compare_eq_op(buf2, buf1, buf4, buf3, TESTBUFLEN_CMP);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret != 1) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 1);
> + return -1;
> + }
> +
> + /* All compares succeed. */
> + for (i = 0; i < TESTBUFLEN_CMP; i++)
> + buf2[i] = (char)i;
> + ret = test_2compare_eq_op(buf2, buf1, buf4, buf3, TESTBUFLEN_CMP);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret != 0) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 0);
> + return -1;
> + }
> +
> + /* First compare failure is op[1], expect 2. */
> + for (i = 0; i < TESTBUFLEN_CMP; i++)
> + buf3[i] = (char)i;
> + ret = test_2compare_eq_op(buf2, buf1, buf4, buf3, TESTBUFLEN_CMP);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret != 2) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 2);
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int test_2compare_ne_op(char *a, char *b, char *c, char *d,
> + size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_NE_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.a, a),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.b, b),
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_COMPARE_NE_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.a, c),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.compare_op.b, d),
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_2compare_ne_index(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN_CMP];
> + char buf2[TESTBUFLEN_CMP];
> + char buf3[TESTBUFLEN_CMP];
> + char buf4[TESTBUFLEN_CMP];
> + const char *test_name = "test_2compare_ne index";
> +
> + printf("Testing %s\n", test_name);
> +
> + memset(buf1, 0, TESTBUFLEN_CMP);
> + memset(buf2, 0, TESTBUFLEN_CMP);
> + memset(buf3, 0, TESTBUFLEN_CMP);
> + memset(buf4, 0, TESTBUFLEN_CMP);
> +
> + /* First compare ne failure is op[0], expect 1. */
> + ret = test_2compare_ne_op(buf2, buf1, buf4, buf3, TESTBUFLEN_CMP);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret != 1) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 1);
> + return -1;
> + }
> +
> + /* All compare ne succeed. */
> + for (i = 0; i < TESTBUFLEN_CMP; i++)
> + buf1[i] = (char)i;
> + for (i = 0; i < TESTBUFLEN_CMP; i++)
> + buf3[i] = (char)i;
> + ret = test_2compare_ne_op(buf2, buf1, buf4, buf3, TESTBUFLEN_CMP);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret != 0) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 0);
> + return -1;
> + }
> +
> + /* First compare failure is op[1], expect 2. */
> + for (i = 0; i < TESTBUFLEN_CMP; i++)
> + buf4[i] = (char)i;
> + ret = test_2compare_ne_op(buf2, buf1, buf4, buf3, TESTBUFLEN_CMP);
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret != 2) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 2);
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int test_memcpy_op(void *dst, void *src, size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.dst, dst),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.src, src),
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_memcpy(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN];
> + char buf2[TESTBUFLEN];
> + const char *test_name = "test_memcpy";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test memcpy */
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf1[i] = (char)i;
> + memset(buf2, 0, TESTBUFLEN);
> + ret = test_memcpy_op(buf2, buf1, TESTBUFLEN);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + for (i = 0; i < TESTBUFLEN; i++) {
> + if (buf2[i] != (char)i) {
> + printf("%s failed. Expecting '%d', found '%d' at offset %d\n",
> + test_name, (char)i, buf2[i], i);
> + return -1;
> + }
> + }
> + return 0;
> +}
> +
> +static int test_memcpy_u32(void)
> +{
> + int ret;
> + uint32_t v1, v2;
> + const char *test_name = "test_memcpy_u32";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test memcpy_u32 */
> + v1 = 42;
> + v2 = 0;
> + ret = test_memcpy_op(&v2, &v1, sizeof(v1));
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (v1 != v2) {
> + printf("%s failed. Expecting '%d', found '%d'\n",
> + test_name, v1, v2);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_memcpy_mb_memcpy_op(void *dst1, void *src1,
> + void *dst2, void *src2, size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.dst, dst1),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.src, src1),
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + [1] = {
> + .op = CPU_MB_OP,
> + },
> + [2] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.dst, dst2),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.src, src2),
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_memcpy_mb_memcpy(void)
> +{
> + int ret;
> + int v1, v2, v3;
> + const char *test_name = "test_memcpy_mb_memcpy";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test memcpy */
> + v1 = 42;
> + v2 = v3 = 0;
> + ret = test_memcpy_mb_memcpy_op(&v2, &v1, &v3, &v2, sizeof(int));
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (v3 != v1) {
> + printf("%s failed. Expecting '%d', found '%d'\n",
> + test_name, v1, v3);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_add_op(int *v, int64_t increment)
> +{
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_op_add(v, increment, sizeof(*v), cpu);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_add(void)
> +{
> + int orig_v = 42, v, ret;
> + int increment = 1;
> + const char *test_name = "test_add";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_add_op(&v, increment);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return -1;
> + }
> + if (v != orig_v + increment) {
> + printf("%s unexpected value: %d. Should be %d.\n",
> + test_name, v, orig_v);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_two_add_op(int *v, int64_t *increments)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_ADD_OP,
> + .len = sizeof(*v),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(
> + .u.arithmetic_op.p, v),
> + .u.arithmetic_op.count = increments[0],
> + .u.arithmetic_op.expect_fault_p = 0,
> + },
> + [1] = {
> + .op = CPU_ADD_OP,
> + .len = sizeof(*v),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(
> + .u.arithmetic_op.p, v),
> + .u.arithmetic_op.count = increments[1],
> + .u.arithmetic_op.expect_fault_p = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_two_add(void)
> +{
> + int orig_v = 42, v, ret;
> + int64_t increments[2] = { 99, 123 };
> + const char *test_name = "test_two_add";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_two_add_op(&v, increments);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return -1;
> + }
> + if (v != orig_v + increments[0] + increments[1]) {
> + printf("%s unexpected value: %d. Should be %d.\n",
> + test_name, v, orig_v);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_or_op(int *v, uint64_t mask)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_OR_OP,
> + .len = sizeof(*v),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(
> + .u.bitwise_op.p, v),
> + .u.bitwise_op.mask = mask,
> + .u.bitwise_op.expect_fault_p = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_or(void)
> +{
> + int orig_v = 0xFF00000, v, ret;
> + uint32_t mask = 0xFFF;
> + const char *test_name = "test_or";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_or_op(&v, mask);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return -1;
> + }
> + if (v != (orig_v | mask)) {
> + printf("%s unexpected value: %d. Should be %d.\n",
> + test_name, v, orig_v | mask);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_and_op(int *v, uint64_t mask)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_AND_OP,
> + .len = sizeof(*v),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(
> + .u.bitwise_op.p, v),
> + .u.bitwise_op.mask = mask,
> + .u.bitwise_op.expect_fault_p = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_and(void)
> +{
> + int orig_v = 0xF00, v, ret;
> + uint32_t mask = 0xFFF;
> + const char *test_name = "test_and";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_and_op(&v, mask);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return -1;
> + }
> + if (v != (orig_v & mask)) {
> + printf("%s unexpected value: %d. Should be %d.\n",
> + test_name, v, orig_v & mask);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_xor_op(int *v, uint64_t mask)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_XOR_OP,
> + .len = sizeof(*v),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(
> + .u.bitwise_op.p, v),
> + .u.bitwise_op.mask = mask,
> + .u.bitwise_op.expect_fault_p = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_xor(void)
> +{
> + int orig_v = 0xF00, v, ret;
> + uint32_t mask = 0xFFF;
> + const char *test_name = "test_xor";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_xor_op(&v, mask);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return -1;
> + }
> + if (v != (orig_v ^ mask)) {
> + printf("%s unexpected value: %d. Should be %d.\n",
> + test_name, v, orig_v ^ mask);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_lshift_op(int *v, uint32_t bits)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_LSHIFT_OP,
> + .len = sizeof(*v),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(
> + .u.shift_op.p, v),
> + .u.shift_op.bits = bits,
> + .u.shift_op.expect_fault_p = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_lshift(void)
> +{
> + int orig_v = 0xF00, v, ret;
> + uint32_t bits = 5;
> + const char *test_name = "test_lshift";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_lshift_op(&v, bits);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return -1;
> + }
> + if (v != (orig_v << bits)) {
> + printf("%s unexpected value: %d. Should be %d.\n",
> + test_name, v, orig_v << bits);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_rshift_op(int *v, uint32_t bits)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_RSHIFT_OP,
> + .len = sizeof(*v),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(
> + .u.shift_op.p, v),
> + .u.shift_op.bits = bits,
> + .u.shift_op.expect_fault_p = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_rshift(void)
> +{
> + int orig_v = 0xF00, v, ret;
> + uint32_t bits = 5;
> + const char *test_name = "test_rshift";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_rshift_op(&v, bits);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return -1;
> + }
> + if (v != (orig_v >> bits)) {
> + printf("%s unexpected value: %d. Should be %d.\n",
> + test_name, v, orig_v >> bits);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_cmpxchg_op(void *v, void *expect, void *old, void *n,
> + size_t len)
> +{
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_op_cmpxchg(v, expect, old, n, len, cpu);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +
> +static int test_cmpxchg_success(void)
> +{
> + int ret;
> + uint64_t orig_v = 1, v, expect = 1, old = 0, n = 3;
> + const char *test_name = "test_cmpxchg success";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_cmpxchg_op(&v, &expect, &old, &n, sizeof(uint64_t));
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 0);
> + return -1;
> + }
> + if (v != n) {
> + printf("%s v is %lld, expecting %lld\n",
> + test_name, (long long)v, (long long)n);
> + return -1;
> + }
> + if (old != orig_v) {
> + printf("%s old is %lld, expecting %lld\n",
> + test_name, (long long)old, (long long)orig_v);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_cmpxchg_fail(void)
> +{
> + int ret;
> + uint64_t orig_v = 1, v, expect = 123, old = 0, n = 3;
> + const char *test_name = "test_cmpxchg fail";
> +
> + printf("Testing %s\n", test_name);
> +
> + v = orig_v;
> + ret = test_cmpxchg_op(&v, &expect, &old, &n, sizeof(uint64_t));
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + if (ret == 0) {
> + printf("%s returned %d, expecting %d\n",
> + test_name, ret, 1);
> + return -1;
> + }
> + if (v == n) {
> + printf("%s v is %lld, expecting %lld\n",
> + test_name, (long long)v, (long long)orig_v);
> + return -1;
> + }
> + if (old != orig_v) {
> + printf("%s old is %lld, expecting %lld\n",
> + test_name, (long long)old, (long long)orig_v);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static int test_memcpy_expect_fault_op(void *dst, void *src, size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.dst, dst),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.src, src),
> + .u.memcpy_op.expect_fault_dst = 0,
> + /* Return EAGAIN on fault. */
> + .u.memcpy_op.expect_fault_src = 1,
> + },
> + };
> + int cpu;
> +
> + cpu = cpu_op_get_current_cpu();
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +static int test_memcpy_fault(void)
> +{
> + int ret;
> + char buf1[TESTBUFLEN];
> + const char *test_name = "test_memcpy_fault";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test memcpy */
> + ret = test_memcpy_op(buf1, NULL, TESTBUFLEN);
> + if (!ret || (ret < 0 && errno != EFAULT)) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + /* Test memcpy expect fault */
> + ret = test_memcpy_expect_fault_op(buf1, NULL, TESTBUFLEN);
> + if (!ret || (ret < 0 && errno != EAGAIN)) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + return 0;
> +}
> +
> +static int do_test_unknown_op(void)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = -1, /* Unknown */
> + .len = 0,
> + },
> + };
> + int cpu;
> +
> + cpu = cpu_op_get_current_cpu();
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +static int test_unknown_op(void)
> +{
> + int ret;
> + const char *test_name = "test_unknown_op";
> +
> + printf("Testing %s\n", test_name);
> +
> + ret = do_test_unknown_op();
> + if (!ret || (ret < 0 && errno != EINVAL)) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + return 0;
> +}
> +
> +static int do_test_max_ops(void)
> +{
> + struct cpu_op opvec[] = {
> + [0] = { .op = CPU_MB_OP, },
> + [1] = { .op = CPU_MB_OP, },
> + [2] = { .op = CPU_MB_OP, },
> + [3] = { .op = CPU_MB_OP, },
> + [4] = { .op = CPU_MB_OP, },
> + [5] = { .op = CPU_MB_OP, },
> + [6] = { .op = CPU_MB_OP, },
> + [7] = { .op = CPU_MB_OP, },
> + [8] = { .op = CPU_MB_OP, },
> + [9] = { .op = CPU_MB_OP, },
> + [10] = { .op = CPU_MB_OP, },
> + [11] = { .op = CPU_MB_OP, },
> + [12] = { .op = CPU_MB_OP, },
> + [13] = { .op = CPU_MB_OP, },
> + [14] = { .op = CPU_MB_OP, },
> + [15] = { .op = CPU_MB_OP, },
> + };
> + int cpu;
> +
> + cpu = cpu_op_get_current_cpu();
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +static int test_max_ops(void)
> +{
> + int ret;
> + const char *test_name = "test_max_ops";
> +
> + printf("Testing %s\n", test_name);
> +
> + ret = do_test_max_ops();
> + if (ret < 0) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + return 0;
> +}
> +
> +static int do_test_too_many_ops(void)
> +{
> + struct cpu_op opvec[] = {
> + [0] = { .op = CPU_MB_OP, },
> + [1] = { .op = CPU_MB_OP, },
> + [2] = { .op = CPU_MB_OP, },
> + [3] = { .op = CPU_MB_OP, },
> + [4] = { .op = CPU_MB_OP, },
> + [5] = { .op = CPU_MB_OP, },
> + [6] = { .op = CPU_MB_OP, },
> + [7] = { .op = CPU_MB_OP, },
> + [8] = { .op = CPU_MB_OP, },
> + [9] = { .op = CPU_MB_OP, },
> + [10] = { .op = CPU_MB_OP, },
> + [11] = { .op = CPU_MB_OP, },
> + [12] = { .op = CPU_MB_OP, },
> + [13] = { .op = CPU_MB_OP, },
> + [14] = { .op = CPU_MB_OP, },
> + [15] = { .op = CPU_MB_OP, },
> + [16] = { .op = CPU_MB_OP, },
> + };
> + int cpu;
> +
> + cpu = cpu_op_get_current_cpu();
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +static int test_too_many_ops(void)
> +{
> + int ret;
> + const char *test_name = "test_too_many_ops";
> +
> + printf("Testing %s\n", test_name);
> +
> + ret = do_test_too_many_ops();
> + if (!ret || (ret < 0 && errno != EINVAL)) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + return 0;
> +}
> +
> +/* Use 64kB len, largest page size known on Linux. */
> +static int test_memcpy_single_too_large(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN_PAGE_MAX + 1];
> + char buf2[TESTBUFLEN_PAGE_MAX + 1];
> + const char *test_name = "test_memcpy_single_too_large";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test memcpy */
> + for (i = 0; i < TESTBUFLEN_PAGE_MAX + 1; i++)
> + buf1[i] = (char)i;
> + memset(buf2, 0, TESTBUFLEN_PAGE_MAX + 1);
> + ret = test_memcpy_op(buf2, buf1, TESTBUFLEN_PAGE_MAX + 1);
> + if (!ret || (ret < 0 && errno != EINVAL)) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + return 0;
> +}
> +
> +static int test_memcpy_single_ok_sum_too_large_op(void *dst, void *src, size_t len)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.dst, dst),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.src, src),
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + [1] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.dst, dst),
> + LINUX_FIELD_u32_u64_INIT_ONSTACK(.u.memcpy_op.src, src),
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> + int ret, cpu;
> +
> + do {
> + cpu = cpu_op_get_current_cpu();
> + ret = cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> + } while (ret == -1 && errno == EAGAIN);
> +
> + return ret;
> +}
> +
> +static int test_memcpy_single_ok_sum_too_large(void)
> +{
> + int i, ret;
> + char buf1[TESTBUFLEN];
> + char buf2[TESTBUFLEN];
> + const char *test_name = "test_memcpy_single_ok_sum_too_large";
> +
> + printf("Testing %s\n", test_name);
> +
> + /* Test memcpy */
> + for (i = 0; i < TESTBUFLEN; i++)
> + buf1[i] = (char)i;
> + memset(buf2, 0, TESTBUFLEN);
> + ret = test_memcpy_single_ok_sum_too_large_op(buf2, buf1, TESTBUFLEN);
> + if (!ret || (ret < 0 && errno != EINVAL)) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + exit(-1);
> + }
> + return 0;
> +}
> +
> +/*
> + * Iterate over large uninitialized arrays to trigger page faults.
> + */
> +int test_page_fault(void)
> +{
> + int ret = 0;
> + uint64_t i;
> + const char *test_name = "test_page_fault";
> +
> + printf("Testing %s\n", test_name);
> +
> + for (i = 0; i < NR_PF_ARRAY; i++) {
> + ret = test_memcpy_op(pf_array_dst[i],
> + pf_array_src[i],
> + PF_ARRAY_LEN);
> + if (ret) {
> + printf("%s returned with %d, errno: %s\n",
> + test_name, ret, strerror(errno));
> + return ret;
> + }
> + }
> + return 0;
> +}
> +
> +int main(int argc, char **argv)
> +{
> + int ret = 0;
> +
> + ret |= test_compare_eq_same();
> + ret |= test_compare_eq_diff();
> + ret |= test_compare_ne_same();
> + ret |= test_compare_ne_diff();
> + ret |= test_2compare_eq_index();
> + ret |= test_2compare_ne_index();
> + ret |= test_memcpy();
> + ret |= test_memcpy_u32();
> + ret |= test_memcpy_mb_memcpy();
> + ret |= test_add();
> + ret |= test_two_add();
> + ret |= test_or();
> + ret |= test_and();
> + ret |= test_xor();
> + ret |= test_lshift();
> + ret |= test_rshift();
> + ret |= test_cmpxchg_success();
> + ret |= test_cmpxchg_fail();
> + ret |= test_memcpy_fault();
> + ret |= test_unknown_op();
> + ret |= test_max_ops();
> + ret |= test_too_many_ops();
> + ret |= test_memcpy_single_too_large();
> + ret |= test_memcpy_single_ok_sum_too_large();
> + ret |= test_page_fault();
> +

Where do pass counts get printed. I am seeing error messages when tests fail,
not seeing any pass messages. It would be nice to use ksft framework for
counting pass/fail for these series of tests that get run.

> + return ret;
> +}
> diff --git a/tools/testing/selftests/cpu-opv/cpu-op.c b/tools/testing/selftests/cpu-opv/cpu-op.c
> new file mode 100644
> index 000000000000..d7ba481cca04
> --- /dev/null
> +++ b/tools/testing/selftests/cpu-opv/cpu-op.c
> @@ -0,0 +1,348 @@
> +/*
> + * cpu-op.c
> + *
> + * Copyright (C) 2017 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; only
> + * version 2.1 of the License.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * Lesser General Public License for more details.
> + */
> +
> +#define _GNU_SOURCE
> +#include <errno.h>
> +#include <sched.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <syscall.h>
> +#include <assert.h>
> +#include <signal.h>
> +
> +#include "cpu-op.h"
> +
> +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
> +
> +int cpu_opv(struct cpu_op *cpu_opv, int cpuopcnt, int cpu, int flags)
> +{
> + return syscall(__NR_cpu_opv, cpu_opv, cpuopcnt, cpu, flags);
> +}
> +
> +int cpu_op_get_current_cpu(void)
> +{
> + int cpu;
> +
> + cpu = sched_getcpu();
> + if (cpu < 0) {
> + perror("sched_getcpu()");
> + abort();
> + }
> + return cpu;
> +}
> +
> +int cpu_op_cmpxchg(void *v, void *expect, void *old, void *n,
> + size_t len, int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + .u.memcpy_op.dst = (unsigned long)old,
> + .u.memcpy_op.src = (unsigned long)v,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + [1] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = len,
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [2] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)n,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_add(void *v, int64_t count, size_t len, int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_ADD_OP,
> + .len = len,
> + .u.arithmetic_op.p = (unsigned long)v,
> + .u.arithmetic_op.count = count,
> + .u.arithmetic_op.expect_fault_p = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv,
> + int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)&expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)&newv,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +static int cpu_op_cmpeqv_storep_expect_fault(intptr_t *v, intptr_t expect,
> + intptr_t *newp, int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)&expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)newp,
> + .u.memcpy_op.expect_fault_dst = 0,
> + /* Return EAGAIN on src fault. */
> + .u.memcpy_op.expect_fault_src = 1,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
> + off_t voffp, intptr_t *load, int cpu)
> +{
> + intptr_t oldv = READ_ONCE(*v);
> + intptr_t *newp = (intptr_t *)(oldv + voffp);
> + int ret;
> +
> + if (oldv == expectnot)
> + return 1;
> + ret = cpu_op_cmpeqv_storep_expect_fault(v, oldv, newp, cpu);
> + if (!ret) {
> + *load = oldv;
> + return 0;
> + }
> + if (ret > 0) {
> + errno = EAGAIN;
> + return -1;
> + }
> + return -1;
> +}
> +
> +int cpu_op_cmpeqv_storev_storev(intptr_t *v, intptr_t expect,
> + intptr_t *v2, intptr_t newv2, intptr_t newv,
> + int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)&expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v2,
> + .u.memcpy_op.src = (unsigned long)&newv2,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + [2] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)&newv,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_cmpeqv_storev_mb_storev(intptr_t *v, intptr_t expect,
> + intptr_t *v2, intptr_t newv2, intptr_t newv,
> + int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)&expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v2,
> + .u.memcpy_op.src = (unsigned long)&newv2,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + [2] = {
> + .op = CPU_MB_OP,
> + },
> + [3] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)&newv,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
> + intptr_t *v2, intptr_t expect2, intptr_t newv,
> + int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)&expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v2,
> + .u.compare_op.b = (unsigned long)&expect2,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [2] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)&newv,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_cmpeqv_memcpy_storev(intptr_t *v, intptr_t expect,
> + void *dst, void *src, size_t len, intptr_t newv,
> + int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)&expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + .u.memcpy_op.dst = (unsigned long)dst,
> + .u.memcpy_op.src = (unsigned long)src,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + [2] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)&newv,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_cmpeqv_memcpy_mb_storev(intptr_t *v, intptr_t expect,
> + void *dst, void *src, size_t len, intptr_t newv,
> + int cpu)
> +{
> + struct cpu_op opvec[] = {
> + [0] = {
> + .op = CPU_COMPARE_EQ_OP,
> + .len = sizeof(intptr_t),
> + .u.compare_op.a = (unsigned long)v,
> + .u.compare_op.b = (unsigned long)&expect,
> + .u.compare_op.expect_fault_a = 0,
> + .u.compare_op.expect_fault_b = 0,
> + },
> + [1] = {
> + .op = CPU_MEMCPY_OP,
> + .len = len,
> + .u.memcpy_op.dst = (unsigned long)dst,
> + .u.memcpy_op.src = (unsigned long)src,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + [2] = {
> + .op = CPU_MB_OP,
> + },
> + [3] = {
> + .op = CPU_MEMCPY_OP,
> + .len = sizeof(intptr_t),
> + .u.memcpy_op.dst = (unsigned long)v,
> + .u.memcpy_op.src = (unsigned long)&newv,
> + .u.memcpy_op.expect_fault_dst = 0,
> + .u.memcpy_op.expect_fault_src = 0,
> + },
> + };
> +
> + return cpu_opv(opvec, ARRAY_SIZE(opvec), cpu, 0);
> +}
> +
> +int cpu_op_addv(intptr_t *v, int64_t count, int cpu)
> +{
> + return cpu_op_add(v, count, sizeof(intptr_t), cpu);
> +}
> diff --git a/tools/testing/selftests/cpu-opv/cpu-op.h b/tools/testing/selftests/cpu-opv/cpu-op.h
> new file mode 100644
> index 000000000000..ba2ec578ec50
> --- /dev/null
> +++ b/tools/testing/selftests/cpu-opv/cpu-op.h
> @@ -0,0 +1,68 @@
> +/*
> + * cpu-op.h
> + *
> + * (C) Copyright 2017 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.
> + */
> +
> +#ifndef CPU_OPV_H
> +#define CPU_OPV_H
> +
> +#include <stdlib.h>
> +#include <stdint.h>
> +#include <linux/cpu_opv.h>
> +
> +#define likely(x) __builtin_expect(!!(x), 1)
> +#define unlikely(x) __builtin_expect(!!(x), 0)
> +#define barrier() __asm__ __volatile__("" : : : "memory")
> +
> +#define ACCESS_ONCE(x) (*(__volatile__ __typeof__(x) *)&(x))
> +#define WRITE_ONCE(x, v) __extension__ ({ ACCESS_ONCE(x) = (v); })
> +#define READ_ONCE(x) ACCESS_ONCE(x)
> +
> +int cpu_opv(struct cpu_op *cpuopv, int cpuopcnt, int cpu, int flags);
> +int cpu_op_get_current_cpu(void);
> +
> +int cpu_op_cmpxchg(void *v, void *expect, void *old, void *_new,
> + size_t len, int cpu);
> +int cpu_op_add(void *v, int64_t count, size_t len, int cpu);
> +
> +int cpu_op_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv,
> + int cpu);
> +int cpu_op_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
> + off_t voffp, intptr_t *load, int cpu);
> +int cpu_op_cmpeqv_storev_storev(intptr_t *v, intptr_t expect,
> + intptr_t *v2, intptr_t newv2, intptr_t newv,
> + int cpu);
> +int cpu_op_cmpeqv_storev_mb_storev(intptr_t *v, intptr_t expect,
> + intptr_t *v2, intptr_t newv2, intptr_t newv,
> + int cpu);
> +int cpu_op_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
> + intptr_t *v2, intptr_t expect2, intptr_t newv,
> + int cpu);
> +int cpu_op_cmpeqv_memcpy_storev(intptr_t *v, intptr_t expect,
> + void *dst, void *src, size_t len, intptr_t newv,
> + int cpu);
> +int cpu_op_cmpeqv_memcpy_mb_storev(intptr_t *v, intptr_t expect,
> + void *dst, void *src, size_t len, intptr_t newv,
> + int cpu);
> +int cpu_op_addv(intptr_t *v, int64_t count, int cpu);
> +
> +#endif /* CPU_OPV_H_ */
> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
> index 5bef05d6ba39..441d7bc63bb7 100644
> --- a/tools/testing/selftests/lib.mk
> +++ b/tools/testing/selftests/lib.mk
> @@ -105,6 +105,9 @@ COMPILE.S = $(CC) $(ASFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c
> LINK.S = $(CC) $(ASFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH)
> endif
>
> +# Selftest makefiles can override those targets by setting
> +# OVERRIDE_TARGETS = 1.
> +ifeq ($(OVERRIDE_TARGETS),)
> $(OUTPUT)/%:%.c
> $(LINK.c) $^ $(LDLIBS) -o $@
>
> @@ -113,5 +116,6 @@ $(OUTPUT)/%.o:%.S
>
> $(OUTPUT)/%:%.S
> $(LINK.S) $^ $(LDLIBS) -o $@
> +endif
>
> .PHONY: run_tests all clean install emit_tests
>

As I said before, please do this change in a separate patch.

thanks,
-- Shuah

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