selftests: riscv: Support xtheadvector in vector tests

Extend existing vector tests to be compatible with the xtheadvector
instructions.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Tested-by: Yangyu Chen <cyy@cyyself.name>
Link: https://lore.kernel.org/r/20241113-xtheadvector-v11-13-236c22791ef9@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

tools/testing/selftests/riscv/vector/v_exec_initval_nolibc.c

@@ -18,13 +18,22 @@ int main(int argc, char **argv)
 	unsigned long vl;
 	int first = 1;
 
-	asm volatile (
-		".option push\n\t"
-		".option arch, +v\n\t"
-		"vsetvli	%[vl], x0, e8, m1, ta, ma\n\t"
-		".option pop\n\t"
-		: [vl] "=r" (vl)
-	);
+	if (argc > 2 && strcmp(argv[2], "x"))
+		asm volatile (
+			// 0 | zimm[10:0] | rs1 | 1 1 1 | rd |1010111| vsetvli
+			// vsetvli	t4, x0, e8, m1, d1
+			".4byte		0b00000000000000000111111011010111\n\t"
+			"mv		%[vl], t4\n\t"
+			: [vl] "=r" (vl) : : "t4"
+		);
+	else
+		asm volatile (
+			".option push\n\t"
+			".option arch, +v\n\t"
+			"vsetvli	%[vl], x0, e8, m1, ta, ma\n\t"
+			".option pop\n\t"
+			: [vl] "=r" (vl)
+		);
 
 #define CHECK_VECTOR_REGISTER(register) ({					\
 	for (int i = 0; i < vl; i++) {						\

tools/testing/selftests/riscv/vector/v_helpers.c

@@ -1,12 +1,22 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
 #include "../hwprobe/hwprobe.h"
+#include <asm/vendor/thead.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <sys/wait.h>
 
+bool is_xtheadvector_supported(void)
+{
+	struct riscv_hwprobe pair;
+
+	pair.key = RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0;
+	riscv_hwprobe(&pair, 1, 0, NULL, 0);
+	return pair.value & RISCV_HWPROBE_VENDOR_EXT_XTHEADVECTOR;
+}
+
 bool is_vector_supported(void)
 {
 	struct riscv_hwprobe pair;
@@ -16,9 +26,9 @@ bool is_vector_supported(void)
 	return pair.value & RISCV_HWPROBE_EXT_ZVE32X;
 }
 
-int launch_test(char *next_program, int test_inherit)
+int launch_test(char *next_program, int test_inherit, int xtheadvector)
 {
-	char *exec_argv[3], *exec_envp[1];
+	char *exec_argv[4], *exec_envp[1];
 	int rc, pid, status;
 
 	pid = fork();
@@ -30,7 +40,8 @@ int launch_test(char *next_program, int test_inherit)
 	if (!pid) {
 		exec_argv[0] = next_program;
 		exec_argv[1] = test_inherit != 0 ? "x" : NULL;
-		exec_argv[2] = NULL;
+		exec_argv[2] = xtheadvector != 0 ? "x" : NULL;
+		exec_argv[3] = NULL;
 		exec_envp[0] = NULL;
 		/* launch the program again to check inherit */
 		rc = execve(next_program, exec_argv, exec_envp);

tools/testing/selftests/riscv/vector/v_helpers.h

@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 #include <stdbool.h>
 
+bool is_xtheadvector_supported(void);
+
 bool is_vector_supported(void);
 
-int launch_test(char *next_program, int test_inherit);
+int launch_test(char *next_program, int test_inherit, int xtheadvector);

tools/testing/selftests/riscv/vector/v_initval.c

@@ -7,10 +7,16 @@
 
 TEST(v_initval)
 {
-	if (!is_vector_supported())
-		SKIP(return, "Vector not supported");
+	int xtheadvector = 0;
 
-	ASSERT_EQ(0, launch_test(NEXT_PROGRAM, 0));
+	if (!is_vector_supported()) {
+		if (is_xtheadvector_supported())
+			xtheadvector = 1;
+		else
+			SKIP(return, "Vector not supported");
+	}
+
+	ASSERT_EQ(0, launch_test(NEXT_PROGRAM, 0, xtheadvector));
 }
 
 TEST_HARNESS_MAIN

tools/testing/selftests/riscv/vector/vstate_exec_nolibc.c

@@ -6,13 +6,16 @@
 
 int main(int argc, char **argv)
 {
-	int rc, pid, status, test_inherit = 0;
+	int rc, pid, status, test_inherit = 0, xtheadvector = 0;
 	long ctrl, ctrl_c;
 	char *exec_argv[2], *exec_envp[2];
 
-	if (argc > 1)
+	if (argc > 1 && strcmp(argv[1], "x"))
 		test_inherit = 1;
 
+	if (argc > 2 && strcmp(argv[2], "x"))
+		xtheadvector = 1;
+
 	ctrl = my_syscall1(__NR_prctl, PR_RISCV_V_GET_CONTROL);
 	if (ctrl < 0) {
 		puts("PR_RISCV_V_GET_CONTROL is not supported\n");
@@ -53,11 +56,14 @@ int main(int argc, char **argv)
 				puts("child's vstate_ctrl not equal to parent's\n");
 				exit(-1);
 			}
-			asm volatile (".option push\n\t"
-				      ".option arch, +v\n\t"
-				      "vsetvli x0, x0, e32, m8, ta, ma\n\t"
-				      ".option pop\n\t"
-				      );
+			if (xtheadvector)
+				asm volatile (".4byte	0x00007ed7");
+			else
+				asm volatile (".option push\n\t"
+					".option arch, +v\n\t"
+					"vsetvli x0, x0, e32, m8, ta, ma\n\t"
+					".option pop\n\t"
+					);
 			exit(ctrl);
 		}
 	}

tools/testing/selftests/riscv/vector/vstate_prctl.c

@@ -11,7 +11,7 @@
 
 #define NEXT_PROGRAM "./vstate_exec_nolibc"
 
-int test_and_compare_child(long provided, long expected, int inherit)
+int test_and_compare_child(long provided, long expected, int inherit, int xtheadvector)
 {
 	int rc;
 
@@ -21,7 +21,7 @@ int test_and_compare_child(long provided, long expected, int inherit)
 		       provided, rc);
 		return -1;
 	}
-	rc = launch_test(NEXT_PROGRAM, inherit);
+	rc = launch_test(NEXT_PROGRAM, inherit, xtheadvector);
 	if (rc != expected) {
 		printf("Test failed, check %d != %ld\n", rc, expected);
 		return -2;
@@ -36,7 +36,7 @@ TEST(get_control_no_v)
 {
 	long rc;
 
-	if (is_vector_supported())
+	if (is_vector_supported() || is_xtheadvector_supported())
 		SKIP(return, "Test expects vector to be not supported");
 
 	rc = prctl(PR_RISCV_V_GET_CONTROL);
@@ -50,7 +50,7 @@ TEST(set_control_no_v)
 {
 	long rc;
 
-	if (is_vector_supported())
+	if (is_vector_supported() || is_xtheadvector_supported())
 		SKIP(return, "Test expects vector to be not supported");
 
 	rc = prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON);
@@ -65,20 +65,20 @@ TEST(vstate_on_current)
 	long flag;
 	long rc;
 
-	if (!is_vector_supported())
+	if (!is_vector_supported() && !is_xtheadvector_supported())
 		SKIP(return, "Vector not supported");
 
 	flag = PR_RISCV_V_VSTATE_CTRL_ON;
 	rc = prctl(PR_RISCV_V_SET_CONTROL, flag);
-	EXPECT_EQ(0, rc) TH_LOG("Enabling V for current should always success");
+	EXPECT_EQ(0, rc) TH_LOG("Enabling V for current should always succeed");
 }
 
 TEST(vstate_off_eperm)
 {
 	long flag;
 	long rc;
 
-	if (!is_vector_supported())
+	if (!is_vector_supported() && !is_xtheadvector_supported())
 		SKIP(return, "Vector not supported");
 
 	flag = PR_RISCV_V_VSTATE_CTRL_OFF;
@@ -92,97 +92,124 @@ TEST(vstate_off_eperm)
 TEST(vstate_on_no_nesting)
 {
 	long flag;
+	int xtheadvector = 0;
 
-	if (!is_vector_supported())
-		SKIP(return, "Vector not supported");
+	if (!is_vector_supported()) {
+		if (is_xtheadvector_supported())
+			xtheadvector = 1;
+		else
+			SKIP(return, "Vector not supported");
+	}
 
 	/* Turn on next's vector explicitly and test */
 	flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
 
-	EXPECT_EQ(0,
-		  test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0));
+	EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0, xtheadvector));
 }
 
 TEST(vstate_off_nesting)
 {
 	long flag;
+	int xtheadvector = 0;
 
-	if (!is_vector_supported())
-		SKIP(return, "Vector not supported");
+	if (!is_vector_supported()) {
+		if (is_xtheadvector_supported())
+			xtheadvector = 1;
+		else
+			SKIP(return, "Vector not supported");
+	}
 
 	/* Turn off next's vector explicitly and test */
 	flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
 
-	EXPECT_EQ(0,
-		  test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 1));
+	EXPECT_EQ(0, test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 1, xtheadvector));
 }
 
 TEST(vstate_on_inherit_no_nesting)
 {
 	long flag, expected;
+	int xtheadvector = 0;
 
-	if (!is_vector_supported())
-		SKIP(return, "Vector not supported");
+	if (!is_vector_supported()) {
+		if (is_xtheadvector_supported())
+			xtheadvector = 1;
+		else
+			SKIP(return, "Vector not supported");
+	}
 
 	/* Turn on next's vector explicitly and test no inherit */
 	flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
 	flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT;
 	expected = flag | PR_RISCV_V_VSTATE_CTRL_ON;
 
-	EXPECT_EQ(0, test_and_compare_child(flag, expected, 0));
+	EXPECT_EQ(0, test_and_compare_child(flag, expected, 0, xtheadvector));
 }
 
 TEST(vstate_on_inherit)
 {
 	long flag, expected;
+	int xtheadvector = 0;
 
-	if (!is_vector_supported())
-		SKIP(return, "Vector not supported");
+	if (!is_vector_supported()) {
+		if (is_xtheadvector_supported())
+			xtheadvector = 1;
+		else
+			SKIP(return, "Vector not supported");
+	}
 
 	/* Turn on next's vector explicitly and test inherit */
 	flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
 	flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT;
 	expected = flag | PR_RISCV_V_VSTATE_CTRL_ON;
 
-	EXPECT_EQ(0, test_and_compare_child(flag, expected, 1));
+	EXPECT_EQ(0, test_and_compare_child(flag, expected, 1, xtheadvector));
 }
 
 TEST(vstate_off_inherit_no_nesting)
 {
 	long flag, expected;
+	int xtheadvector = 0;
 
-	if (!is_vector_supported())
-		SKIP(return, "Vector not supported");
-
+	if (!is_vector_supported()) {
+		if (is_xtheadvector_supported())
+			xtheadvector = 1;
+		else
+			SKIP(return, "Vector not supported");
+	}
 	/* Turn off next's vector explicitly and test no inherit */
 	flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
 	flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT;
 	expected = flag | PR_RISCV_V_VSTATE_CTRL_OFF;
 
-	EXPECT_EQ(0, test_and_compare_child(flag, expected, 0));
+	EXPECT_EQ(0, test_and_compare_child(flag, expected, 0, xtheadvector));
 }
 
 TEST(vstate_off_inherit)
 {
 	long flag, expected;
+	int xtheadvector = 0;
 
-	if (!is_vector_supported())
-		SKIP(return, "Vector not supported");
+	if (!is_vector_supported()) {
+		if (is_xtheadvector_supported())
+			xtheadvector = 1;
+		else
+			SKIP(return, "Vector not supported");
+	}
 
 	/* Turn off next's vector explicitly and test inherit */
 	flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT;
 	flag |= PR_RISCV_V_VSTATE_CTRL_INHERIT;
 	expected = flag | PR_RISCV_V_VSTATE_CTRL_OFF;
 
-	EXPECT_EQ(0, test_and_compare_child(flag, expected, 1));
+	EXPECT_EQ(0, test_and_compare_child(flag, expected, 1, xtheadvector));
 }
 
 /* arguments should fail with EINVAL */
 TEST(inval_set_control_1)
 {
 	int rc;
 
-	if (!is_vector_supported())
+	if (!is_vector_supported() && !is_xtheadvector_supported())
 		SKIP(return, "Vector not supported");
 
 	rc = prctl(PR_RISCV_V_SET_CONTROL, 0xff0);
@@ -195,7 +222,7 @@ TEST(inval_set_control_2)
 {
 	int rc;
 
-	if (!is_vector_supported())
+	if (!is_vector_supported() && !is_xtheadvector_supported())
 		SKIP(return, "Vector not supported");
 
 	rc = prctl(PR_RISCV_V_SET_CONTROL, 0x3);
@@ -208,7 +235,7 @@ TEST(inval_set_control_3)
 {
 	int rc;
 
-	if (!is_vector_supported())
+	if (!is_vector_supported() && !is_xtheadvector_supported())
 		SKIP(return, "Vector not supported");
 
 	rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc);