tools/testing/selftests/powerpc/math/vmx_signal.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/powerpc/math/vmx_signal.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/powerpc/math/vmx_signal.c
Extension
.c
Size
3922 bytes
Lines
157
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

if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {
			int j;
			/*
			 * Shouldn't printf() in a signal handler, however, this is a
			 * test and we've detected failure. Understanding what failed
			 * is paramount. All that happens after this is tests exit with
			 * failure.
			 */
			printf("VMX mismatch at reg %d!\n", i);
			printf("Reg | Actual                  | Expected\n");
			for (j = 20; j < 32; j++) {
				printf("%d  | 0x%04x%04x%04x%04x      | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],
					   mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],
					   varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);
			}
			bad_context = true;
			break;
		}
	}
}

void *signal_vmx_c(void *p)
{
	int i, j;
	long rc;
	struct sigaction act;
	act.sa_sigaction = signal_vmx_sig;
	act.sa_flags = SA_SIGINFO;
	rc = sigaction(SIGUSR1, &act, NULL);
	if (rc)
		return p;

	srand(pthread_self());
	for (i = 0; i < 12; i++)
		for (j = 0; j < 4; j++)
			varray[i][j] = rand();

	rc = preempt_vmx(varray, &threads_starting, &running);

	return (void *) rc;
}

int test_signal_vmx(void)
{
	int i, j, rc, threads;
	void *rc_p;
	pthread_t *tids;

	// vcmpequd used in vmx_asm.S is v2.07
	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));

	threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
	tids = malloc(threads * sizeof(pthread_t));
	FAIL_IF(!tids);

	running = true;
	threads_starting = threads;
	for (i = 0; i < threads; i++) {
		rc = pthread_create(&tids[i], NULL, signal_vmx_c, NULL);
		FAIL_IF(rc);
	}

	setbuf(stdout, NULL);
	printf("\tWaiting for %d workers to start... %d", threads, threads_starting);
	while (threads_starting) {
		asm volatile("": : :"memory");
		usleep(1000);
		printf(", %d", threads_starting);
	}
	printf(" ...done\n");

	printf("\tSending signals to all threads %d times...", ITERATIONS);
	for (i = 0; i < ITERATIONS; i++) {
		for (j = 0; j < threads; j++) {
			pthread_kill(tids[j], SIGUSR1);
		}
		sleep(1);
	}
	printf("done\n");

	printf("\tKilling workers...");
	running = 0;
	for (i = 0; i < threads; i++) {
		pthread_join(tids[i], &rc_p);

		/*
		 * Harness will say the fail was here, look at why signal_vmx
		 * returned
		 */
		if ((long) rc_p || bad_context)

Annotation

Implementation Notes