1 // SPDX-License-Identifier: GPL-2.0-only
3  *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
23 	if (fd == -1)  in cpupower_read_sysfs()
26 	numread = read(fd, buf, buflen - 1);  in cpupower_read_sysfs()
39  * Detect whether a CPU is online
42  *     1 -> if CPU is online
43  *     0 -> if CPU is offline
46 int cpupower_is_cpu_online(unsigned int cpu)  in cpupower_is_cpu_online()  argument
56 	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u", cpu);  in cpupower_is_cpu_online()
63 	 * -> cpuX directory exists, but not cpuX/online file  in cpupower_is_cpu_online()
65 	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/online", cpu);  in cpupower_is_cpu_online()
70 	if (fd == -1)  in cpupower_is_cpu_online()
71 		return -errno;  in cpupower_is_cpu_online()
73 	numread = read(fd, linebuf, MAX_LINE_LEN - 1);  in cpupower_is_cpu_online()
76 		return -EIO;  in cpupower_is_cpu_online()
83 		return -EINVAL;  in cpupower_is_cpu_online()
88 /* returns -1 on failure, 0 on success */
89 static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *result)  in sysfs_topology_read_file()  argument
95 	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s",  in sysfs_topology_read_file()
96 			 cpu, fname);  in sysfs_topology_read_file()
98 		return -1;  in sysfs_topology_read_file()
101 		return -1;  in sysfs_topology_read_file()
109 	if (top1->pkg < top2->pkg)  in __compare()
110 		return -1;  in __compare()
111 	else if (top1->pkg > top2->pkg)  in __compare()
113 	else if (top1->core < top2->core)  in __compare()
114 		return -1;  in __compare()
115 	else if (top1->core > top2->core)  in __compare()
117 	else if (top1->cpu < top2->cpu)  in __compare()
118 		return -1;  in __compare()
119 	else if (top1->cpu > top2->cpu)  in __compare()
129  * Array is sorted after ->pkg, ->core, then ->cpu
133 	int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF);  in get_cpu_topology()  local
135 	cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus);  in get_cpu_topology()
136 	if (cpu_top->core_info == NULL)  in get_cpu_topology()
137 		return -ENOMEM;  in get_cpu_topology()
138 	cpu_top->pkgs = cpu_top->cores = 0;  in get_cpu_topology()
139 	for (cpu = 0; cpu < cpus; cpu++) {  in get_cpu_topology()
140 		cpu_top->core_info[cpu].cpu = cpu;  in get_cpu_topology()
141 		cpu_top->core_info[cpu].is_online = cpupower_is_cpu_online(cpu);  in get_cpu_topology()
143 			cpu,  in get_cpu_topology()
145 			&(cpu_top->core_info[cpu].pkg)) < 0) {  in get_cpu_topology()
146 			cpu_top->core_info[cpu].pkg = -1;  in get_cpu_topology()
147 			cpu_top->core_info[cpu].core = -1;  in get_cpu_topology()
151 			cpu,  in get_cpu_topology()
153 			&(cpu_top->core_info[cpu].core)) < 0) {  in get_cpu_topology()
154 			cpu_top->core_info[cpu].pkg = -1;  in get_cpu_topology()
155 			cpu_top->core_info[cpu].core = -1;  in get_cpu_topology()
160 	qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info),  in get_cpu_topology()
166 	last_pkg = cpu_top->core_info[0].pkg;  in get_cpu_topology()
167 	for(cpu = 1; cpu < cpus; cpu++) {  in get_cpu_topology()
168 		if (cpu_top->core_info[cpu].pkg != last_pkg &&  in get_cpu_topology()
169 				cpu_top->core_info[cpu].pkg != -1) {  in get_cpu_topology()
171 			last_pkg = cpu_top->core_info[cpu].pkg;  in get_cpu_topology()
172 			cpu_top->pkgs++;  in get_cpu_topology()
175 	if (!(cpu_top->core_info[0].pkg == -1))  in get_cpu_topology()
176 		cpu_top->pkgs++;  in get_cpu_topology()
181 	for (cpu = 0; cpu_top->core_info[cpu].pkg = 0 && cpu < cpus; cpu++) {  in get_cpu_topology()
182 		if (cpu_top->core_info[cpu].core == 0)  in get_cpu_topology()
183 	cpu_top->cores++;  in get_cpu_topology()