This source file includes following definitions.
- parse_dt_topology
- update_cpu_capacity
- parse_dt_topology
- update_cpu_capacity
- cpu_corepower_mask
- store_cpu_topology
- cpu_corepower_flags
- init_cpu_topology
1
2
3
4
5
6
7
8
9
10
11
12
13
14 #include <linux/arch_topology.h>
15 #include <linux/cpu.h>
16 #include <linux/cpufreq.h>
17 #include <linux/cpumask.h>
18 #include <linux/export.h>
19 #include <linux/init.h>
20 #include <linux/percpu.h>
21 #include <linux/node.h>
22 #include <linux/nodemask.h>
23 #include <linux/of.h>
24 #include <linux/sched.h>
25 #include <linux/sched/topology.h>
26 #include <linux/slab.h>
27 #include <linux/string.h>
28
29 #include <asm/cpu.h>
30 #include <asm/cputype.h>
31 #include <asm/topology.h>
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49 #ifdef CONFIG_OF
50 struct cpu_efficiency {
51 const char *compatible;
52 unsigned long efficiency;
53 };
54
55
56
57
58
59
60
61
62
63
64
65 static const struct cpu_efficiency table_efficiency[] = {
66 {"arm,cortex-a15", 3891},
67 {"arm,cortex-a7", 2048},
68 {NULL, },
69 };
70
71 static unsigned long *__cpu_capacity;
72 #define cpu_capacity(cpu) __cpu_capacity[cpu]
73
74 static unsigned long middle_capacity = 1;
75 static bool cap_from_dt = true;
76
77
78
79
80
81
82
83
84
85 static void __init parse_dt_topology(void)
86 {
87 const struct cpu_efficiency *cpu_eff;
88 struct device_node *cn = NULL;
89 unsigned long min_capacity = ULONG_MAX;
90 unsigned long max_capacity = 0;
91 unsigned long capacity = 0;
92 int cpu = 0;
93
94 __cpu_capacity = kcalloc(nr_cpu_ids, sizeof(*__cpu_capacity),
95 GFP_NOWAIT);
96
97 for_each_possible_cpu(cpu) {
98 const u32 *rate;
99 int len;
100
101
102 cn = of_get_cpu_node(cpu, NULL);
103 if (!cn) {
104 pr_err("missing device node for CPU %d\n", cpu);
105 continue;
106 }
107
108 if (topology_parse_cpu_capacity(cn, cpu)) {
109 of_node_put(cn);
110 continue;
111 }
112
113 cap_from_dt = false;
114
115 for (cpu_eff = table_efficiency; cpu_eff->compatible; cpu_eff++)
116 if (of_device_is_compatible(cn, cpu_eff->compatible))
117 break;
118
119 if (cpu_eff->compatible == NULL)
120 continue;
121
122 rate = of_get_property(cn, "clock-frequency", &len);
123 if (!rate || len != 4) {
124 pr_err("%pOF missing clock-frequency property\n", cn);
125 continue;
126 }
127
128 capacity = ((be32_to_cpup(rate)) >> 20) * cpu_eff->efficiency;
129
130
131 if (capacity < min_capacity)
132 min_capacity = capacity;
133
134
135 if (capacity > max_capacity)
136 max_capacity = capacity;
137
138 cpu_capacity(cpu) = capacity;
139 }
140
141
142
143
144
145
146
147
148 if (4*max_capacity < (3*(max_capacity + min_capacity)))
149 middle_capacity = (min_capacity + max_capacity)
150 >> (SCHED_CAPACITY_SHIFT+1);
151 else
152 middle_capacity = ((max_capacity / 3)
153 >> (SCHED_CAPACITY_SHIFT-1)) + 1;
154
155 if (cap_from_dt)
156 topology_normalize_cpu_scale();
157 }
158
159
160
161
162
163
164 static void update_cpu_capacity(unsigned int cpu)
165 {
166 if (!cpu_capacity(cpu) || cap_from_dt)
167 return;
168
169 topology_set_cpu_scale(cpu, cpu_capacity(cpu) / middle_capacity);
170
171 pr_info("CPU%u: update cpu_capacity %lu\n",
172 cpu, topology_get_cpu_scale(cpu));
173 }
174
175 #else
176 static inline void parse_dt_topology(void) {}
177 static inline void update_cpu_capacity(unsigned int cpuid) {}
178 #endif
179
180
181
182
183
184 const struct cpumask *cpu_corepower_mask(int cpu)
185 {
186 return &cpu_topology[cpu].thread_sibling;
187 }
188
189
190
191
192
193
194 void store_cpu_topology(unsigned int cpuid)
195 {
196 struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
197 unsigned int mpidr;
198
199 if (cpuid_topo->package_id != -1)
200 goto topology_populated;
201
202 mpidr = read_cpuid_mpidr();
203
204
205 if ((mpidr & MPIDR_SMP_BITMASK) == MPIDR_SMP_VALUE) {
206
207
208
209
210
211 if (mpidr & MPIDR_MT_BITMASK) {
212
213 cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
214 cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
215 cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
216 } else {
217
218 cpuid_topo->thread_id = -1;
219 cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
220 cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
221 }
222 } else {
223
224
225
226
227
228 cpuid_topo->thread_id = -1;
229 cpuid_topo->core_id = 0;
230 cpuid_topo->package_id = -1;
231 }
232
233 update_cpu_capacity(cpuid);
234
235 pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
236 cpuid, cpu_topology[cpuid].thread_id,
237 cpu_topology[cpuid].core_id,
238 cpu_topology[cpuid].package_id, mpidr);
239
240 topology_populated:
241 update_siblings_masks(cpuid);
242 }
243
244 static inline int cpu_corepower_flags(void)
245 {
246 return SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN;
247 }
248
249 static struct sched_domain_topology_level arm_topology[] = {
250 #ifdef CONFIG_SCHED_MC
251 { cpu_corepower_mask, cpu_corepower_flags, SD_INIT_NAME(GMC) },
252 { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
253 #endif
254 { cpu_cpu_mask, SD_INIT_NAME(DIE) },
255 { NULL, },
256 };
257
258
259
260
261
262 void __init init_cpu_topology(void)
263 {
264 reset_cpu_topology();
265 smp_wmb();
266
267 parse_dt_topology();
268
269
270 set_sched_topology(arm_topology);
271 }