1 files changed, 182 insertions, 22 deletions

diff --git a/tools/testing/selftests/arm64/abi/syscall-abi.c b/tools/testing/selftests/arm64/abi/syscall-abi.c
index 1e13b7523918..b632bfe9e022 100644
--- a/tools/testing/selftests/arm64/abi/syscall-abi.c
+++ b/tools/testing/selftests/arm64/abi/syscall-abi.c
@@ -18,9 +18,13 @@
 
 #include "../../kselftest.h"
 
+#include "syscall-abi.h"
+
 #define NUM_VL ((SVE_VQ_MAX - SVE_VQ_MIN) + 1)
 
-extern void do_syscall(int sve_vl);
+static int default_sme_vl;
+
+extern void do_syscall(int sve_vl, int sme_vl);
 
 static void fill_random(void *buf, size_t size)
 {
@@ -48,14 +52,15 @@ static struct syscall_cfg {
 uint64_t gpr_in[NUM_GPR];
 uint64_t gpr_out[NUM_GPR];
 
-static void setup_gpr(struct syscall_cfg *cfg, int sve_vl)
+static void setup_gpr(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		      uint64_t svcr)
 {
 	fill_random(gpr_in, sizeof(gpr_in));
 	gpr_in[8] = cfg->syscall_nr;
 	memset(gpr_out, 0, sizeof(gpr_out));
 }
 
-static int check_gpr(struct syscall_cfg *cfg, int sve_vl)
+static int check_gpr(struct syscall_cfg *cfg, int sve_vl, int sme_vl, uint64_t svcr)
 {
 	int errors = 0;
 	int i;
@@ -79,13 +84,15 @@ static int check_gpr(struct syscall_cfg *cfg, int sve_vl)
 uint64_t fpr_in[NUM_FPR * 2];
 uint64_t fpr_out[NUM_FPR * 2];
 
-static void setup_fpr(struct syscall_cfg *cfg, int sve_vl)
+static void setup_fpr(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		      uint64_t svcr)
 {
 	fill_random(fpr_in, sizeof(fpr_in));
 	memset(fpr_out, 0, sizeof(fpr_out));
 }
 
-static int check_fpr(struct syscall_cfg *cfg, int sve_vl)
+static int check_fpr(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		     uint64_t svcr)
 {
 	int errors = 0;
 	int i;
@@ -109,13 +116,15 @@ static uint8_t z_zero[__SVE_ZREG_SIZE(SVE_VQ_MAX)];
 uint8_t z_in[SVE_NUM_PREGS * __SVE_ZREG_SIZE(SVE_VQ_MAX)];
 uint8_t z_out[SVE_NUM_PREGS * __SVE_ZREG_SIZE(SVE_VQ_MAX)];
 
-static void setup_z(struct syscall_cfg *cfg, int sve_vl)
+static void setup_z(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		    uint64_t svcr)
 {
 	fill_random(z_in, sizeof(z_in));
 	fill_random(z_out, sizeof(z_out));
 }
 
-static int check_z(struct syscall_cfg *cfg, int sve_vl)
+static int check_z(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		   uint64_t svcr)
 {
 	size_t reg_size = sve_vl;
 	int errors = 0;
@@ -126,13 +135,17 @@ static int check_z(struct syscall_cfg *cfg, int sve_vl)
 
 	/*
 	 * After a syscall the low 128 bits of the Z registers should
-	 * be preserved and the rest be zeroed or preserved.
+	 * be preserved and the rest be zeroed or preserved, except if
+	 * we were in streaming mode in which case the low 128 bits may
+	 * also be cleared by the transition out of streaming mode.
 	 */
 	for (i = 0; i < SVE_NUM_ZREGS; i++) {
 		void *in = &z_in[reg_size * i];
 		void *out = &z_out[reg_size * i];
 
-		if (memcmp(in, out, SVE_VQ_BYTES) != 0) {
+		if ((memcmp(in, out, SVE_VQ_BYTES) != 0) &&
+		    !((svcr & SVCR_SM_MASK) &&
+		      memcmp(z_zero, out, SVE_VQ_BYTES) == 0)) {
 			ksft_print_msg("%s SVE VL %d Z%d low 128 bits changed\n",
 				       cfg->name, sve_vl, i);
 			errors++;
@@ -145,13 +158,15 @@ static int check_z(struct syscall_cfg *cfg, int sve_vl)
 uint8_t p_in[SVE_NUM_PREGS * __SVE_PREG_SIZE(SVE_VQ_MAX)];
 uint8_t p_out[SVE_NUM_PREGS * __SVE_PREG_SIZE(SVE_VQ_MAX)];
 
-static void setup_p(struct syscall_cfg *cfg, int sve_vl)
+static void setup_p(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		    uint64_t svcr)
 {
 	fill_random(p_in, sizeof(p_in));
 	fill_random(p_out, sizeof(p_out));
 }
 
-static int check_p(struct syscall_cfg *cfg, int sve_vl)
+static int check_p(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		   uint64_t svcr)
 {
 	size_t reg_size = sve_vq_from_vl(sve_vl) * 2; /* 1 bit per VL byte */
 
@@ -175,9 +190,20 @@ static int check_p(struct syscall_cfg *cfg, int sve_vl)
 uint8_t ffr_in[__SVE_PREG_SIZE(SVE_VQ_MAX)];
 uint8_t ffr_out[__SVE_PREG_SIZE(SVE_VQ_MAX)];
 
-static void setup_ffr(struct syscall_cfg *cfg, int sve_vl)
+static void setup_ffr(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		      uint64_t svcr)
 {
 	/*
+	 * If we are in streaming mode and do not have FA64 then FFR
+	 * is unavailable.
+	 */
+	if ((svcr & SVCR_SM_MASK) &&
+	    !(getauxval(AT_HWCAP2) & HWCAP2_SME_FA64)) {
+		memset(&ffr_in, 0, sizeof(ffr_in));
+		return;
+	}
+
+	/*
 	 * It is only valid to set a contiguous set of bits starting
 	 * at 0.  For now since we're expecting this to be cleared by
 	 * a syscall just set all bits.
@@ -186,7 +212,8 @@ static void setup_ffr(struct syscall_cfg *cfg, int sve_vl)
 	fill_random(ffr_out, sizeof(ffr_out));
 }
 
-static int check_ffr(struct syscall_cfg *cfg, int sve_vl)
+static int check_ffr(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		     uint64_t svcr)
 {
 	size_t reg_size = sve_vq_from_vl(sve_vl) * 2;  /* 1 bit per VL byte */
 	int errors = 0;
@@ -195,6 +222,10 @@ static int check_ffr(struct syscall_cfg *cfg, int sve_vl)
 	if (!sve_vl)
 		return 0;
 
+	if ((svcr & SVCR_SM_MASK) &&
+	    !(getauxval(AT_HWCAP2) & HWCAP2_SME_FA64))
+		return 0;
+
 	/* After a syscall the P registers should be preserved or zeroed */
 	for (i = 0; i < reg_size; i++)
 		if (ffr_out[i] && (ffr_in[i] != ffr_out[i]))
@@ -206,8 +237,65 @@ static int check_ffr(struct syscall_cfg *cfg, int sve_vl)
 	return errors;
 }
 
-typedef void (*setup_fn)(struct syscall_cfg *cfg, int sve_vl);
-typedef int (*check_fn)(struct syscall_cfg *cfg, int sve_vl);
+uint64_t svcr_in, svcr_out;
+
+static void setup_svcr(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		    uint64_t svcr)
+{
+	svcr_in = svcr;
+}
+
+static int check_svcr(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		      uint64_t svcr)
+{
+	int errors = 0;
+
+	if (svcr_out & SVCR_SM_MASK) {
+		ksft_print_msg("%s Still in SM, SVCR %llx\n",
+			       cfg->name, svcr_out);
+		errors++;
+	}
+
+	if ((svcr_in & SVCR_ZA_MASK) != (svcr_out & SVCR_ZA_MASK)) {
+		ksft_print_msg("%s PSTATE.ZA changed, SVCR %llx != %llx\n",
+			       cfg->name, svcr_in, svcr_out);
+		errors++;
+	}
+
+	return errors;
+}
+
+uint8_t za_in[SVE_NUM_PREGS * __SVE_ZREG_SIZE(SVE_VQ_MAX)];
+uint8_t za_out[SVE_NUM_PREGS * __SVE_ZREG_SIZE(SVE_VQ_MAX)];
+
+static void setup_za(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		     uint64_t svcr)
+{
+	fill_random(za_in, sizeof(za_in));
+	memset(za_out, 0, sizeof(za_out));
+}
+
+static int check_za(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		    uint64_t svcr)
+{
+	size_t reg_size = sme_vl * sme_vl;
+	int errors = 0;
+
+	if (!(svcr & SVCR_ZA_MASK))
+		return 0;
+
+	if (memcmp(za_in, za_out, reg_size) != 0) {
+		ksft_print_msg("SME VL %d ZA does not match\n", sme_vl);
+		errors++;
+	}
+
+	return errors;
+}
+
+typedef void (*setup_fn)(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+			 uint64_t svcr);
+typedef int (*check_fn)(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+			uint64_t svcr);
 
 /*
  * Each set of registers has a setup function which is called before
@@ -225,20 +313,23 @@ static struct {
 	{ setup_z, check_z },
 	{ setup_p, check_p },
 	{ setup_ffr, check_ffr },
+	{ setup_svcr, check_svcr },
+	{ setup_za, check_za },
 };
 
-static bool do_test(struct syscall_cfg *cfg, int sve_vl)
+static bool do_test(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
+		    uint64_t svcr)
 {
 	int errors = 0;
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(regset); i++)
-		regset[i].setup(cfg, sve_vl);
+		regset[i].setup(cfg, sve_vl, sme_vl, svcr);
 
-	do_syscall(sve_vl);
+	do_syscall(sve_vl, sme_vl);
 
 	for (i = 0; i < ARRAY_SIZE(regset); i++)
-		errors += regset[i].check(cfg, sve_vl);
+		errors += regset[i].check(cfg, sve_vl, sme_vl, svcr);
 
 	return errors == 0;
 }
@@ -246,9 +337,10 @@ static bool do_test(struct syscall_cfg *cfg, int sve_vl)
 static void test_one_syscall(struct syscall_cfg *cfg)
 {
 	int sve_vq, sve_vl;
+	int sme_vq, sme_vl;
 
 	/* FPSIMD only case */
-	ksft_test_result(do_test(cfg, 0),
+	ksft_test_result(do_test(cfg, 0, default_sme_vl, 0),
 			 "%s FPSIMD\n", cfg->name);
 
 	if (!(getauxval(AT_HWCAP) & HWCAP_SVE))
@@ -265,8 +357,36 @@ static void test_one_syscall(struct syscall_cfg *cfg)
 		if (sve_vq != sve_vq_from_vl(sve_vl))
 			sve_vq = sve_vq_from_vl(sve_vl);
 
-		ksft_test_result(do_test(cfg, sve_vl),
+		ksft_test_result(do_test(cfg, sve_vl, default_sme_vl, 0),
 				 "%s SVE VL %d\n", cfg->name, sve_vl);
+
+		if (!(getauxval(AT_HWCAP2) & HWCAP2_SME))
+			continue;
+
+		for (sme_vq = SVE_VQ_MAX; sme_vq > 0; --sme_vq) {
+			sme_vl = prctl(PR_SME_SET_VL, sme_vq * 16);
+			if (sme_vl == -1)
+				ksft_exit_fail_msg("PR_SME_SET_VL failed: %s (%d)\n",
+						   strerror(errno), errno);
+
+			sme_vl &= PR_SME_VL_LEN_MASK;
+
+			if (sme_vq != sve_vq_from_vl(sme_vl))
+				sme_vq = sve_vq_from_vl(sme_vl);
+
+			ksft_test_result(do_test(cfg, sve_vl, sme_vl,
+						 SVCR_ZA_MASK | SVCR_SM_MASK),
+					 "%s SVE VL %d/SME VL %d SM+ZA\n",
+					 cfg->name, sve_vl, sme_vl);
+			ksft_test_result(do_test(cfg, sve_vl, sme_vl,
+						 SVCR_SM_MASK),
+					 "%s SVE VL %d/SME VL %d SM\n",
+					 cfg->name, sve_vl, sme_vl);
+			ksft_test_result(do_test(cfg, sve_vl, sme_vl,
+						 SVCR_ZA_MASK),
+					 "%s SVE VL %d/SME VL %d ZA\n",
+					 cfg->name, sve_vl, sme_vl);
+		}
 	}
 }
 
@@ -299,14 +419,54 @@ int sve_count_vls(void)
 	return vl_count;
 }
 
+int sme_count_vls(void)
+{
+	unsigned int vq;
+	int vl_count = 0;
+	int vl;
+
+	if (!(getauxval(AT_HWCAP2) & HWCAP2_SME))
+		return 0;
+
+	/* Ensure we configure a SME VL, used to flag if SVCR is set */
+	default_sme_vl = 16;
+
+	/*
+	 * 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)
+			ksft_exit_fail_msg("PR_SME_SET_VL failed: %s (%d)\n",
+					   strerror(errno), errno);
+
+		vl &= PR_SME_VL_LEN_MASK;
+
+		if (vq != sve_vq_from_vl(vl))
+			vq = sve_vq_from_vl(vl);
+
+		vl_count++;
+	}
+
+	return vl_count;
+}
+
 int main(void)
 {
 	int i;
+	int tests = 1;  /* FPSIMD */
 
 	srandom(getpid());
 
 	ksft_print_header();
-	ksft_set_plan(ARRAY_SIZE(syscalls) * (sve_count_vls() + 1));
+	tests += sve_count_vls();
+	tests += (sve_count_vls() * sme_count_vls()) * 3;
+	ksft_set_plan(ARRAY_SIZE(syscalls) * tests);
+
+	if (getauxval(AT_HWCAP2) & HWCAP2_SME_FA64)
+		ksft_print_msg("SME with FA64\n");
+	else if (getauxval(AT_HWCAP2) & HWCAP2_SME)
+		ksft_print_msg("SME without FA64\n");
 
 	for (i = 0; i < ARRAY_SIZE(syscalls); i++)
 		test_one_syscall(&syscalls[i]);