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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | // SPDX-License-Identifier: GPL-2.0-only #include <sys/prctl.h> #include <unistd.h> #include <asm/hwprobe.h> #include <errno.h> #include <sys/wait.h> #include "../../kselftest.h" /* * Rather than relying on having a new enough libc to define this, just do it * ourselves. This way we don't need to be coupled to a new-enough libc to * contain the call. */ long riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count, size_t cpu_count, unsigned long *cpus, unsigned int flags); #define NEXT_PROGRAM "./vstate_exec_nolibc" static int launch_test(int test_inherit) { char *exec_argv[3], *exec_envp[1]; int rc, pid, status; pid = fork(); if (pid < 0) { ksft_test_result_fail("fork failed %d", pid); return -1; } if (!pid) { exec_argv[0] = NEXT_PROGRAM; exec_argv[1] = test_inherit != 0 ? "x" : NULL; exec_argv[2] = NULL; exec_envp[0] = NULL; /* launch the program again to check inherit */ rc = execve(NEXT_PROGRAM, exec_argv, exec_envp); if (rc) { perror("execve"); ksft_test_result_fail("child execve failed %d\n", rc); exit(-1); } } rc = waitpid(-1, &status, 0); if (rc < 0) { ksft_test_result_fail("waitpid failed\n"); return -3; } if ((WIFEXITED(status) && WEXITSTATUS(status) == -1) || WIFSIGNALED(status)) { ksft_test_result_fail("child exited abnormally\n"); return -4; } return WEXITSTATUS(status); } int test_and_compare_child(long provided, long expected, int inherit) { int rc; rc = prctl(PR_RISCV_V_SET_CONTROL, provided); if (rc != 0) { ksft_test_result_fail("prctl with provided arg %lx failed with code %d\n", provided, rc); return -1; } rc = launch_test(inherit); if (rc != expected) { ksft_test_result_fail("Test failed, check %d != %d\n", rc, expected); return -2; } return 0; } #define PR_RISCV_V_VSTATE_CTRL_CUR_SHIFT 0 #define PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT 2 int main(void) { struct riscv_hwprobe pair; long flag, expected; long rc; pair.key = RISCV_HWPROBE_KEY_IMA_EXT_0; rc = riscv_hwprobe(&pair, 1, 0, NULL, 0); if (rc < 0) { ksft_test_result_fail("hwprobe() failed with %d\n", rc); return -1; } if (pair.key != RISCV_HWPROBE_KEY_IMA_EXT_0) { ksft_test_result_fail("hwprobe cannot probe RISCV_HWPROBE_KEY_IMA_EXT_0\n"); return -2; } if (!(pair.value & RISCV_HWPROBE_IMA_V)) { rc = prctl(PR_RISCV_V_GET_CONTROL); if (rc != -1 || errno != EINVAL) { ksft_test_result_fail("GET_CONTROL should fail on kernel/hw without V\n"); return -3; } rc = prctl(PR_RISCV_V_SET_CONTROL, PR_RISCV_V_VSTATE_CTRL_ON); if (rc != -1 || errno != EINVAL) { ksft_test_result_fail("GET_CONTROL should fail on kernel/hw without V\n"); return -4; } ksft_test_result_skip("Vector not supported\n"); return 0; } flag = PR_RISCV_V_VSTATE_CTRL_ON; rc = prctl(PR_RISCV_V_SET_CONTROL, flag); if (rc != 0) { ksft_test_result_fail("Enabling V for current should always success\n"); return -5; } flag = PR_RISCV_V_VSTATE_CTRL_OFF; rc = prctl(PR_RISCV_V_SET_CONTROL, flag); if (rc != -1 || errno != EPERM) { ksft_test_result_fail("Disabling current's V alive must fail with EPERM(%d)\n", errno); return -5; } /* Turn on next's vector explicitly and test */ flag = PR_RISCV_V_VSTATE_CTRL_ON << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; if (test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_ON, 0)) return -6; /* Turn off next's vector explicitly and test */ flag = PR_RISCV_V_VSTATE_CTRL_OFF << PR_RISCV_V_VSTATE_CTRL_NEXT_SHIFT; if (test_and_compare_child(flag, PR_RISCV_V_VSTATE_CTRL_OFF, 0)) return -7; /* 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; if (test_and_compare_child(flag, expected, 0)) return -8; if (test_and_compare_child(flag, expected, 1)) return -9; /* 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; if (test_and_compare_child(flag, expected, 0)) return -10; if (test_and_compare_child(flag, expected, 1)) return -11; /* arguments should fail with EINVAL */ rc = prctl(PR_RISCV_V_SET_CONTROL, 0xff0); if (rc != -1 || errno != EINVAL) { ksft_test_result_fail("Undefined control argument should return EINVAL\n"); return -12; } rc = prctl(PR_RISCV_V_SET_CONTROL, 0x3); if (rc != -1 || errno != EINVAL) { ksft_test_result_fail("Undefined control argument should return EINVAL\n"); return -12; } rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc); if (rc != -1 || errno != EINVAL) { ksft_test_result_fail("Undefined control argument should return EINVAL\n"); return -12; } rc = prctl(PR_RISCV_V_SET_CONTROL, 0xc); if (rc != -1 || errno != EINVAL) { ksft_test_result_fail("Undefined control argument should return EINVAL\n"); return -12; } ksft_test_result_pass("tests for riscv_v_vstate_ctrl pass\n"); ksft_exit_pass(); return 0; } |