| 1 | /* |
| 2 | * SVE ioctls tests |
| 3 | * |
| 4 | * Test the SVE width setting ioctls work and provide a base for |
| 5 | * testing the gdbstub. |
| 6 | * |
| 7 | * Copyright (c) 2019 Linaro Ltd |
| 8 | * |
| 9 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 10 | */ |
| 11 | #include <sys/prctl.h> |
| 12 | #include <asm/hwcap.h> |
| 13 | #include <stdio.h> |
| 14 | #include <sys/auxv.h> |
| 15 | #include <stdint.h> |
| 16 | #include <stdlib.h> |
| 17 | |
| 18 | #ifndef HWCAP_CPUID |
| 19 | #define HWCAP_CPUID (1 << 11) |
| 20 | #endif |
| 21 | |
| 22 | #define SVE_MAX_QUADS (2048 / 128) |
| 23 | #define BYTES_PER_QUAD (128 / 8) |
| 24 | |
| 25 | #define get_cpu_reg(id) ({ \ |
| 26 | unsigned long __val; \ |
| 27 | asm("mrs %0, "#id : "=r" (__val)); \ |
| 28 | __val; \ |
| 29 | }) |
| 30 | |
| 31 | static int do_sve_ioctl_test(void) |
| 32 | { |
| 33 | int i, res, init_vq; |
| 34 | |
| 35 | res = prctl(PR_SVE_GET_VL, 0, 0, 0, 0); |
| 36 | if (res < 0) { |
| 37 | printf("FAILED to PR_SVE_GET_VL (%d)", res); |
| 38 | return -1; |
| 39 | } |
| 40 | init_vq = res & PR_SVE_VL_LEN_MASK; |
| 41 | |
| 42 | for (i = init_vq; i > 15; i /= 2) { |
| 43 | printf("Checking PR_SVE_SET_VL=%d\n", i); |
| 44 | res = prctl(PR_SVE_SET_VL, i, 0, 0, 0, 0); |
| 45 | if (res < 0) { |
| 46 | printf("FAILED to PR_SVE_SET_VL (%d)", res); |
| 47 | return -1; |
| 48 | } |
| 49 | asm("index z0.b, #0, #1\n" |
| 50 | ".global __sve_ld_done\n" |
| 51 | "__sve_ld_done:\n" |
| 52 | "mov z0.b, #0\n" |
| 53 | : /* no outputs kept */ |
| 54 | : /* no inputs */ |
| 55 | : "memory", "z0"); |
| 56 | } |
| 57 | printf("PASS\n"); |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | int main(int argc, char **argv) |
| 62 | { |
| 63 | /* we also need to probe for the ioctl support */ |
| 64 | if (getauxval(AT_HWCAP) & HWCAP_SVE) { |
| 65 | return do_sve_ioctl_test(); |
| 66 | } else { |
| 67 | printf("SKIP: no HWCAP_SVE on this system\n"); |
| 68 | return 0; |
| 69 | } |
| 70 | } |