1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2ebd5858cSAnshuman Khandual /* 3ebd5858cSAnshuman Khandual * POWER Data Stream Control Register (DSCR) sysfs interface test 4ebd5858cSAnshuman Khandual * 5ebd5858cSAnshuman Khandual * This test updates to system wide DSCR default through the sysfs interface 6ebd5858cSAnshuman Khandual * and then verifies that all the CPU specific DSCR defaults are updated as 7ebd5858cSAnshuman Khandual * well verified from their sysfs interfaces. 8ebd5858cSAnshuman Khandual * 9ebd5858cSAnshuman Khandual * Copyright 2015, Anshuman Khandual, IBM Corporation. 10ebd5858cSAnshuman Khandual */ 11ebd5858cSAnshuman Khandual #include "dscr.h" 12ebd5858cSAnshuman Khandual 13ebd5858cSAnshuman Khandual static int check_cpu_dscr_default(char *file, unsigned long val) 14ebd5858cSAnshuman Khandual { 15ebd5858cSAnshuman Khandual char buf[10]; 16ebd5858cSAnshuman Khandual int fd, rc; 17ebd5858cSAnshuman Khandual 18ebd5858cSAnshuman Khandual fd = open(file, O_RDWR); 19ebd5858cSAnshuman Khandual if (fd == -1) { 20ebd5858cSAnshuman Khandual perror("open() failed"); 21ebd5858cSAnshuman Khandual return 1; 22ebd5858cSAnshuman Khandual } 23ebd5858cSAnshuman Khandual 24ebd5858cSAnshuman Khandual rc = read(fd, buf, sizeof(buf)); 25ebd5858cSAnshuman Khandual if (rc == -1) { 26ebd5858cSAnshuman Khandual perror("read() failed"); 27ebd5858cSAnshuman Khandual return 1; 28ebd5858cSAnshuman Khandual } 29ebd5858cSAnshuman Khandual close(fd); 30ebd5858cSAnshuman Khandual 31ebd5858cSAnshuman Khandual buf[rc] = '\0'; 32ebd5858cSAnshuman Khandual if (strtol(buf, NULL, 16) != val) { 33ebd5858cSAnshuman Khandual printf("DSCR match failed: %ld (system) %ld (cpu)\n", 34ebd5858cSAnshuman Khandual val, strtol(buf, NULL, 16)); 35ebd5858cSAnshuman Khandual return 1; 36ebd5858cSAnshuman Khandual } 37ebd5858cSAnshuman Khandual return 0; 38ebd5858cSAnshuman Khandual } 39ebd5858cSAnshuman Khandual 40ebd5858cSAnshuman Khandual static int check_all_cpu_dscr_defaults(unsigned long val) 41ebd5858cSAnshuman Khandual { 42ebd5858cSAnshuman Khandual DIR *sysfs; 43ebd5858cSAnshuman Khandual struct dirent *dp; 44ebd5858cSAnshuman Khandual char file[LEN_MAX]; 45ebd5858cSAnshuman Khandual 46ebd5858cSAnshuman Khandual sysfs = opendir(CPU_PATH); 47ebd5858cSAnshuman Khandual if (!sysfs) { 48ebd5858cSAnshuman Khandual perror("opendir() failed"); 49ebd5858cSAnshuman Khandual return 1; 50ebd5858cSAnshuman Khandual } 51ebd5858cSAnshuman Khandual 52ebd5858cSAnshuman Khandual while ((dp = readdir(sysfs))) { 5306755a87SSeth Forshee int len; 5406755a87SSeth Forshee 55ebd5858cSAnshuman Khandual if (!(dp->d_type & DT_DIR)) 56ebd5858cSAnshuman Khandual continue; 57ebd5858cSAnshuman Khandual if (!strcmp(dp->d_name, "cpuidle")) 58ebd5858cSAnshuman Khandual continue; 59ebd5858cSAnshuman Khandual if (!strstr(dp->d_name, "cpu")) 60ebd5858cSAnshuman Khandual continue; 61ebd5858cSAnshuman Khandual 6206755a87SSeth Forshee len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name); 6306755a87SSeth Forshee if (len >= LEN_MAX) 6406755a87SSeth Forshee continue; 65ebd5858cSAnshuman Khandual if (access(file, F_OK)) 66ebd5858cSAnshuman Khandual continue; 67ebd5858cSAnshuman Khandual 68ebd5858cSAnshuman Khandual if (check_cpu_dscr_default(file, val)) 69ebd5858cSAnshuman Khandual return 1; 70ebd5858cSAnshuman Khandual } 71ebd5858cSAnshuman Khandual closedir(sysfs); 72ebd5858cSAnshuman Khandual return 0; 73ebd5858cSAnshuman Khandual } 74ebd5858cSAnshuman Khandual 75ebd5858cSAnshuman Khandual int dscr_sysfs(void) 76ebd5858cSAnshuman Khandual { 77ebd5858cSAnshuman Khandual unsigned long orig_dscr_default; 78ebd5858cSAnshuman Khandual int i, j; 79ebd5858cSAnshuman Khandual 804c3c3c50SMichael Ellerman SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR)); 814c3c3c50SMichael Ellerman 82ebd5858cSAnshuman Khandual orig_dscr_default = get_default_dscr(); 83ebd5858cSAnshuman Khandual for (i = 0; i < COUNT; i++) { 84ebd5858cSAnshuman Khandual for (j = 0; j < DSCR_MAX; j++) { 85ebd5858cSAnshuman Khandual set_default_dscr(j); 86ebd5858cSAnshuman Khandual if (check_all_cpu_dscr_defaults(j)) 87ebd5858cSAnshuman Khandual goto fail; 88ebd5858cSAnshuman Khandual } 89ebd5858cSAnshuman Khandual } 90ebd5858cSAnshuman Khandual set_default_dscr(orig_dscr_default); 91ebd5858cSAnshuman Khandual return 0; 92ebd5858cSAnshuman Khandual fail: 93ebd5858cSAnshuman Khandual set_default_dscr(orig_dscr_default); 94ebd5858cSAnshuman Khandual return 1; 95ebd5858cSAnshuman Khandual } 96ebd5858cSAnshuman Khandual 97ebd5858cSAnshuman Khandual int main(int argc, char *argv[]) 98ebd5858cSAnshuman Khandual { 99ebd5858cSAnshuman Khandual return test_harness(dscr_sysfs, "dscr_sysfs_test"); 100ebd5858cSAnshuman Khandual } 101