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1 /**
2  * Copyright (C) ARM Limited 2013-2014. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  */
10 #if GATOR_IKS_SUPPORT
12 #include <linux/of.h>
13 #include <asm/bL_switcher.h>
14 #include <asm/smp_plat.h>
15 #include <trace/events/power_cpu_migrate.h>
17 static bool map_cpuids;
18 static int mpidr_cpuids[NR_CPUS];
19 static const struct gator_cpu * mpidr_cpus[NR_CPUS];
20 static int __lcpu_to_pcpu[NR_CPUS];
22 static const struct gator_cpu *gator_find_cpu_by_dt_name(const char *const name)
23 {
24         int i;
26         for (i = 0; gator_cpus[i].cpuid != 0; ++i) {
27                 const struct gator_cpu *const gator_cpu = &gator_cpus[i];
28                 if (gator_cpu->dt_name != NULL && strcmp(gator_cpu->dt_name, name) == 0) {
29                         return gator_cpu;
30                 }
31         }
33         return NULL;
34 }
36 static void calc_first_cluster_size(void)
37 {
38         int len;
39         const u32 *val;
40         const char *compatible;
41         struct device_node *cn = NULL;
42         int mpidr_cpuids_count = 0;
44         // Zero is a valid cpuid, so initialize the array to 0xff's
45         memset(&mpidr_cpuids, 0xff, sizeof(mpidr_cpuids));
46         memset(&mpidr_cpus, 0, sizeof(mpidr_cpus));
48         while ((cn = of_find_node_by_type(cn, "cpu"))) {
49                 BUG_ON(mpidr_cpuids_count >= NR_CPUS);
51                 val = of_get_property(cn, "reg", &len);
52                 if (!val || len != 4) {
53                         pr_err("%s missing reg property\n", cn->full_name);
54                         continue;
55                 }
56                 compatible = of_get_property(cn, "compatible", NULL);
57                 if (compatible == NULL) {
58                         pr_err("%s missing compatible property\n", cn->full_name);
59                         continue;
60                 }
62                 mpidr_cpuids[mpidr_cpuids_count] = be32_to_cpup(val);
63                 mpidr_cpus[mpidr_cpuids_count] = gator_find_cpu_by_dt_name(compatible);
64                 ++mpidr_cpuids_count;
65         }
67         map_cpuids = (mpidr_cpuids_count == nr_cpu_ids);
68 }
70 static int linearize_mpidr(int mpidr)
71 {
72         int i;
73         for (i = 0; i < nr_cpu_ids; ++i) {
74                 if (mpidr_cpuids[i] == mpidr) {
75                         return i;
76                 }
77         }
79         BUG();
80 }
82 int lcpu_to_pcpu(const int lcpu)
83 {
84         int pcpu;
86         if (!map_cpuids)
87                 return lcpu;
89         BUG_ON(lcpu >= nr_cpu_ids || lcpu < 0);
90         pcpu = __lcpu_to_pcpu[lcpu];
91         BUG_ON(pcpu >= nr_cpu_ids || pcpu < 0);
92         return pcpu;
93 }
95 int pcpu_to_lcpu(const int pcpu)
96 {
97         int lcpu;
99         if (!map_cpuids)
100                 return pcpu;
102         BUG_ON(pcpu >= nr_cpu_ids || pcpu < 0);
103         for (lcpu = 0; lcpu < nr_cpu_ids; ++lcpu) {
104                 if (__lcpu_to_pcpu[lcpu] == pcpu) {
105                         BUG_ON(lcpu >= nr_cpu_ids || lcpu < 0);
106                         return lcpu;
107                 }
108         }
109         BUG();
112 static void gator_update_cpu_mapping(u32 cpu_hwid)
114         int lcpu = smp_processor_id();
115         int pcpu = linearize_mpidr(cpu_hwid & MPIDR_HWID_BITMASK);
116         BUG_ON(lcpu >= nr_cpu_ids || lcpu < 0);
117         BUG_ON(pcpu >= nr_cpu_ids || pcpu < 0);
118         __lcpu_to_pcpu[lcpu] = pcpu;
121 GATOR_DEFINE_PROBE(cpu_migrate_begin, TP_PROTO(u64 timestamp, u32 cpu_hwid))
123         const int cpu = get_physical_cpu();
125         gator_timer_offline((void *)1);
126         gator_timer_offline_dispatch(cpu, true);
129 GATOR_DEFINE_PROBE(cpu_migrate_finish, TP_PROTO(u64 timestamp, u32 cpu_hwid))
131         int cpu;
133         gator_update_cpu_mapping(cpu_hwid);
135         // get_physical_cpu must be called after gator_update_cpu_mapping
136         cpu = get_physical_cpu();
137         gator_timer_online_dispatch(cpu, true);
138         gator_timer_online((void *)1);
141 GATOR_DEFINE_PROBE(cpu_migrate_current, TP_PROTO(u64 timestamp, u32 cpu_hwid))
143         gator_update_cpu_mapping(cpu_hwid);
146 static void gator_send_iks_core_names(void)
148         int cpu;
149         // Send the cpu names
150         preempt_disable();
151         for (cpu = 0; cpu < nr_cpu_ids; ++cpu) {
152                 if (mpidr_cpus[cpu] != NULL) {
153                         gator_send_core_name(cpu, mpidr_cpus[cpu]->cpuid, mpidr_cpus[cpu]);
154                 }
155         }
156         preempt_enable();
159 static int gator_migrate_start(void)
161         int retval = 0;
163         if (!map_cpuids)
164                 return retval;
166         if (retval == 0)
167                 retval = GATOR_REGISTER_TRACE(cpu_migrate_begin);
168         if (retval == 0)
169                 retval = GATOR_REGISTER_TRACE(cpu_migrate_finish);
170         if (retval == 0)
171                 retval = GATOR_REGISTER_TRACE(cpu_migrate_current);
172         if (retval == 0) {
173                 // Initialize the logical to physical cpu mapping
174                 memset(&__lcpu_to_pcpu, 0xff, sizeof(__lcpu_to_pcpu));
175                 bL_switcher_trace_trigger();
176         }
177         return retval;
180 static void gator_migrate_stop(void)
182         if (!map_cpuids)
183                 return;
185         GATOR_UNREGISTER_TRACE(cpu_migrate_current);
186         GATOR_UNREGISTER_TRACE(cpu_migrate_finish);
187         GATOR_UNREGISTER_TRACE(cpu_migrate_begin);
190 #else
192 #define calc_first_cluster_size()
193 #define gator_send_iks_core_names()
194 #define gator_migrate_start() 0
195 #define gator_migrate_stop()
197 #endif