tools/testing/selftests/arm64/fp/fp-stress.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/arm64/fp/fp-stress.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/arm64/fp/fp-stress.c
Extension
.c
Size
14679 bytes
Lines
661
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

static void start_kernel(struct child_data *child, int cpu, int copy)
{
	int ret;

	ret = asprintf(&child->name, "KERNEL-%d-%d", cpu, copy);
	if (ret == -1)
		ksft_exit_fail_msg("asprintf() failed\n");

	child_start(child, "./kernel-test");

	ksft_print_msg("Started %s\n", child->name);
}

static void start_sve(struct child_data *child, int vl, int cpu)
{
	int ret;

	ret = prctl(PR_SVE_SET_VL, vl | PR_SVE_VL_INHERIT);
	if (ret < 0)
		ksft_exit_fail_msg("Failed to set SVE VL %d\n", vl);

	ret = asprintf(&child->name, "SVE-VL-%d-%d", vl, cpu);
	if (ret == -1)
		ksft_exit_fail_msg("asprintf() failed\n");

	child_start(child, "./sve-test");

	ksft_print_msg("Started %s\n", child->name);
}

static void start_ssve(struct child_data *child, int vl, int cpu)
{
	int ret;

	ret = asprintf(&child->name, "SSVE-VL-%d-%d", vl, cpu);
	if (ret == -1)
		ksft_exit_fail_msg("asprintf() failed\n");

	ret = prctl(PR_SME_SET_VL, vl | PR_SME_VL_INHERIT);
	if (ret < 0)
		ksft_exit_fail_msg("Failed to set SME VL %d\n", ret);

	child_start(child, "./ssve-test");

	ksft_print_msg("Started %s\n", child->name);
}

static void start_za(struct child_data *child, int vl, int cpu)
{
	int ret;

	ret = prctl(PR_SME_SET_VL, vl | PR_SVE_VL_INHERIT);
	if (ret < 0)
		ksft_exit_fail_msg("Failed to set SME VL %d\n", ret);

	ret = asprintf(&child->name, "ZA-VL-%d-%d", vl, cpu);
	if (ret == -1)
		ksft_exit_fail_msg("asprintf() failed\n");

	child_start(child, "./za-test");

	ksft_print_msg("Started %s\n", child->name);
}

static void start_zt(struct child_data *child, int cpu)
{
	int ret;

	ret = asprintf(&child->name, "ZT-%d", cpu);
	if (ret == -1)
		ksft_exit_fail_msg("asprintf() failed\n");

	child_start(child, "./zt-test");

	ksft_print_msg("Started %s\n", child->name);
}

static void probe_vls(int vls[], int *vl_count, int set_vl)
{
	unsigned int vq;
	int vl;

	*vl_count = 0;

	for (vq = SVE_VQ_MAX; vq > 0; vq /= 2) {
		vl = prctl(set_vl, vq * 16);
		if (vl == -1)
			ksft_exit_fail_msg("SET_VL failed: %s (%d)\n",
					   strerror(errno), errno);

Annotation

Implementation Notes