Add a test that generates SSVE and ZA context in a single signal frame to
ensure that nothing is going wrong in that case for any reason.
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
.../arm64/signal/testcases/ssve_za_regs.c | 162 +++++++++++++++++++++
1 file changed, 162 insertions(+)
diff --git a/tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c b/tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c
new file mode 100644
index 000000000000..954a21f6121a
--- /dev/null
+++ b/tools/testing/selftests/arm64/signal/testcases/ssve_za_regs.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021 ARM Limited
+ *
+ * Verify that both the streaming SVE and ZA register context in
+ * signal frames is set up as expected when enabled simultaneously.
+ */
+
+#include <signal.h>
+#include <ucontext.h>
+#include <sys/prctl.h>
+
+#include "test_signals_utils.h"
+#include "testcases.h"
+
+static union {
+ ucontext_t uc;
+ char buf[1024 * 128];
+} context;
+static unsigned int vls[SVE_VQ_MAX];
+unsigned int nvls = 0;
+
+static bool sme_get_vls(struct tdescr *td)
+{
+ int vq, vl;
+
+ /*
+ * Enumerate up to SVE_VQ_MAX vector lengths
+ */
+ for (vq = SVE_VQ_MAX; vq > 0; --vq) {
+ vl = prctl(PR_SME_SET_VL, vq * 16);
+ if (vl == -1)
+ return false;
+
+ vl &= PR_SME_VL_LEN_MASK;
+
+ /* Skip missing VLs */
+ vq = sve_vq_from_vl(vl);
+
+ vls[nvls++] = vl;
+ }
+
+ /* We need at least one VL */
+ if (nvls < 1) {
+ fprintf(stderr, "Only %d VL supported\n", nvls);
+ return false;
+ }
+
+ return true;
+}
+
+static void setup_regs(void)
+{
+ /* smstart sm; real data is TODO */
+ asm volatile(".inst 0xd503437f" : : : );
+
+ /* smstart za; real data is TODO */
+ asm volatile(".inst 0xd503457f" : : : );
+}
+
+static char zeros[ZA_SIG_REGS_SIZE(SVE_VQ_MAX)];
+
+static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
+ unsigned int vl)
+{
+ size_t offset;
+ struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
+ struct _aarch64_ctx *regs;
+ struct sve_context *ssve;
+ struct za_context *za;
+ int ret;
+
+ fprintf(stderr, "Testing VL %d\n", vl);
+
+ ret = prctl(PR_SME_SET_VL, vl);
+ if (ret != vl) {
+ fprintf(stderr, "Failed to set VL, got %d\n", ret);
+ return 1;
+ }
+
+ /*
+ * Get a signal context which should have the SVE and ZA
+ * frames in it.
+ */
+ setup_regs();
+ if (!get_current_context(td, &context.uc, sizeof(context)))
+ return 1;
+
+ regs = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
+ &offset);
+ if (!regs) {
+ fprintf(stderr, "No SVE context\n");
+ return 1;
+ }
+
+ ssve = (struct sve_context *)regs;
+ if (ssve->vl != vl) {
+ fprintf(stderr, "Got SSVE VL %d, expected %d\n", ssve->vl, vl);
+ return 1;
+ }
+
+ if (!(ssve->flags & SVE_SIG_FLAG_SM)) {
+ fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n");
+ return 1;
+ }
+
+ fprintf(stderr, "Got expected SSVE size %u and VL %d\n",
+ regs->size, ssve->vl);
+
+ regs = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context),
+ &offset);
+ if (!regs) {
+ fprintf(stderr, "No ZA context\n");
+ return 1;
+ }
+
+ za = (struct za_context *)regs;
+ if (za->vl != vl) {
+ fprintf(stderr, "Got ZA VL %d, expected %d\n", za->vl, vl);
+ return 1;
+ }
+
+ fprintf(stderr, "Got expected ZA size %u and VL %d\n",
+ regs->size, za->vl);
+
+ /* We didn't load any data into ZA so it should be all zeros */
+ if (memcmp(zeros, (char *)za + ZA_SIG_REGS_OFFSET,
+ ZA_SIG_REGS_SIZE(sve_vq_from_vl(za->vl))) != 0) {
+ fprintf(stderr, "ZA data invalid\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
+{
+ int i;
+
+ for (i = 0; i < nvls; i++) {
+ if (do_one_sme_vl(td, si, uc, vls[i]))
+ return 1;
+ }
+
+ td->pass = 1;
+
+ return 0;
+}
+
+struct tdescr tde = {
+ .name = "Streaming SVE registers",
+ .descr = "Check that we get the right Streaming SVE registers reported",
+ /*
+ * We shouldn't require FA64 but things like memset() used in the
+ * helpers might use unsupported instructions so for now disable
+ * the test unless we've got the full instruction set.
+ */
+ .feats_required = FEAT_SME | FEAT_SME_FA64,
+ .timeout = 3,
+ .init = sme_get_vls,
+ .run = sme_regs,
+};
--
2.34.1
