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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Generic OPP helper interface for CPU device
4 *
5 * Copyright (C) 2009-2014 Texas Instruments Incorporated.
6 * Nishanth Menon
7 * Romit Dasgupta
8 * Kevin Hilman
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/cpu.h>
14#include <linux/cpufreq.h>
15#include <linux/err.h>
16#include <linux/errno.h>
17#include <linux/export.h>
18#include <linux/slab.h>
19
20#include "opp.h"
21
22#ifdef CONFIG_CPU_FREQ
23
24/**
25 * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
26 * @dev: device for which we do this operation
27 * @opp_table: Cpufreq table returned back to caller
28 *
29 * Generate a cpufreq table for a provided device- this assumes that the
30 * opp table is already initialized and ready for usage.
31 *
32 * This function allocates required memory for the cpufreq table. It is
33 * expected that the caller does the required maintenance such as freeing
34 * the table as required.
35 *
36 * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
37 * if no memory available for the operation (table is not populated), returns 0
38 * if successful and table is populated.
39 *
40 * WARNING: It is important for the callers to ensure refreshing their copy of
41 * the table if any of the mentioned functions have been invoked in the interim.
42 */
43int dev_pm_opp_init_cpufreq_table(struct device *dev,
44 struct cpufreq_frequency_table **opp_table)
45{
46 struct dev_pm_opp *opp;
47 struct cpufreq_frequency_table *freq_table = NULL;
48 int i, max_opps, ret = 0;
49 unsigned long rate;
50
51 max_opps = dev_pm_opp_get_opp_count(dev);
52 if (max_opps <= 0)
53 return max_opps ? max_opps : -ENODATA;
54
55 freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL);
56 if (!freq_table)
57 return -ENOMEM;
58
59 for (i = 0, rate = 0; i < max_opps; i++, rate++) {
60 /* find next rate */
61 opp = dev_pm_opp_find_freq_ceil(dev, &rate);
62 if (IS_ERR(opp)) {
63 ret = PTR_ERR(opp);
64 goto out;
65 }
66 freq_table[i].driver_data = i;
67 freq_table[i].frequency = rate / 1000;
68
69 /* Is Boost/turbo opp ? */
70 if (dev_pm_opp_is_turbo(opp))
71 freq_table[i].flags = CPUFREQ_BOOST_FREQ;
72
73 dev_pm_opp_put(opp);
74 }
75
76 freq_table[i].driver_data = i;
77 freq_table[i].frequency = CPUFREQ_TABLE_END;
78
79 *opp_table = &freq_table[0];
80
81out:
82 if (ret)
83 kfree(freq_table);
84
85 return ret;
86}
87EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
88
89/**
90 * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
91 * @dev: device for which we do this operation
92 * @opp_table: table to free
93 *
94 * Free up the table allocated by dev_pm_opp_init_cpufreq_table
95 */
96void dev_pm_opp_free_cpufreq_table(struct device *dev,
97 struct cpufreq_frequency_table **opp_table)
98{
99 if (!opp_table)
100 return;
101
102 kfree(*opp_table);
103 *opp_table = NULL;
104}
105EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
106#endif /* CONFIG_CPU_FREQ */
107
108void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask,
109 int last_cpu)
110{
111 struct device *cpu_dev;
112 int cpu;
113
114 WARN_ON(cpumask_empty(cpumask));
115
116 for_each_cpu(cpu, cpumask) {
117 if (cpu == last_cpu)
118 break;
119
120 cpu_dev = get_cpu_device(cpu);
121 if (!cpu_dev) {
122 pr_err("%s: failed to get cpu%d device\n", __func__,
123 cpu);
124 continue;
125 }
126
127 dev_pm_opp_remove_table(cpu_dev);
128 }
129}
130
131/**
132 * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
133 * @cpumask: cpumask for which OPP table needs to be removed
134 *
135 * This removes the OPP tables for CPUs present in the @cpumask.
136 * This should be used to remove all the OPPs entries associated with
137 * the cpus in @cpumask.
138 */
139void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
140{
141 _dev_pm_opp_cpumask_remove_table(cpumask, -1);
142}
143EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
144
145/**
146 * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
147 * @cpu_dev: CPU device for which we do this operation
148 * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev
149 *
150 * This marks OPP table of the @cpu_dev as shared by the CPUs present in
151 * @cpumask.
152 *
153 * Returns -ENODEV if OPP table isn't already present.
154 */
155int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
156 const struct cpumask *cpumask)
157{
158 struct opp_device *opp_dev;
159 struct opp_table *opp_table;
160 struct device *dev;
161 int cpu, ret = 0;
162
163 opp_table = _find_opp_table(cpu_dev);
164 if (IS_ERR(opp_table))
165 return PTR_ERR(opp_table);
166
167 for_each_cpu(cpu, cpumask) {
168 if (cpu == cpu_dev->id)
169 continue;
170
171 dev = get_cpu_device(cpu);
172 if (!dev) {
173 dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
174 __func__, cpu);
175 continue;
176 }
177
178 opp_dev = _add_opp_dev(dev, opp_table);
179 if (!opp_dev) {
180 dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",
181 __func__, cpu);
182 continue;
183 }
184
185 /* Mark opp-table as multiple CPUs are sharing it now */
186 opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
187 }
188
189 dev_pm_opp_put_opp_table(opp_table);
190
191 return ret;
192}
193EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
194
195/**
196 * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
197 * @cpu_dev: CPU device for which we do this operation
198 * @cpumask: cpumask to update with information of sharing CPUs
199 *
200 * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
201 *
202 * Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
203 * table's status is access-unknown.
204 */
205int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
206{
207 struct opp_device *opp_dev;
208 struct opp_table *opp_table;
209 int ret = 0;
210
211 opp_table = _find_opp_table(cpu_dev);
212 if (IS_ERR(opp_table))
213 return PTR_ERR(opp_table);
214
215 if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
216 ret = -EINVAL;
217 goto put_opp_table;
218 }
219
220 cpumask_clear(cpumask);
221
222 if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
223 mutex_lock(&opp_table->lock);
224 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
225 cpumask_set_cpu(opp_dev->dev->id, cpumask);
226 mutex_unlock(&opp_table->lock);
227 } else {
228 cpumask_set_cpu(cpu_dev->id, cpumask);
229 }
230
231put_opp_table:
232 dev_pm_opp_put_opp_table(opp_table);
233
234 return ret;
235}
236EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);
1/*
2 * Generic OPP helper interface for CPU device
3 *
4 * Copyright (C) 2009-2014 Texas Instruments Incorporated.
5 * Nishanth Menon
6 * Romit Dasgupta
7 * Kevin Hilman
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/cpu.h>
17#include <linux/cpufreq.h>
18#include <linux/err.h>
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/slab.h>
22
23#include "opp.h"
24
25#ifdef CONFIG_CPU_FREQ
26
27/**
28 * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
29 * @dev: device for which we do this operation
30 * @table: Cpufreq table returned back to caller
31 *
32 * Generate a cpufreq table for a provided device- this assumes that the
33 * opp table is already initialized and ready for usage.
34 *
35 * This function allocates required memory for the cpufreq table. It is
36 * expected that the caller does the required maintenance such as freeing
37 * the table as required.
38 *
39 * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
40 * if no memory available for the operation (table is not populated), returns 0
41 * if successful and table is populated.
42 *
43 * WARNING: It is important for the callers to ensure refreshing their copy of
44 * the table if any of the mentioned functions have been invoked in the interim.
45 */
46int dev_pm_opp_init_cpufreq_table(struct device *dev,
47 struct cpufreq_frequency_table **table)
48{
49 struct dev_pm_opp *opp;
50 struct cpufreq_frequency_table *freq_table = NULL;
51 int i, max_opps, ret = 0;
52 unsigned long rate;
53
54 max_opps = dev_pm_opp_get_opp_count(dev);
55 if (max_opps <= 0)
56 return max_opps ? max_opps : -ENODATA;
57
58 freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL);
59 if (!freq_table)
60 return -ENOMEM;
61
62 for (i = 0, rate = 0; i < max_opps; i++, rate++) {
63 /* find next rate */
64 opp = dev_pm_opp_find_freq_ceil(dev, &rate);
65 if (IS_ERR(opp)) {
66 ret = PTR_ERR(opp);
67 goto out;
68 }
69 freq_table[i].driver_data = i;
70 freq_table[i].frequency = rate / 1000;
71
72 /* Is Boost/turbo opp ? */
73 if (dev_pm_opp_is_turbo(opp))
74 freq_table[i].flags = CPUFREQ_BOOST_FREQ;
75
76 dev_pm_opp_put(opp);
77 }
78
79 freq_table[i].driver_data = i;
80 freq_table[i].frequency = CPUFREQ_TABLE_END;
81
82 *table = &freq_table[0];
83
84out:
85 if (ret)
86 kfree(freq_table);
87
88 return ret;
89}
90EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
91
92/**
93 * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
94 * @dev: device for which we do this operation
95 * @table: table to free
96 *
97 * Free up the table allocated by dev_pm_opp_init_cpufreq_table
98 */
99void dev_pm_opp_free_cpufreq_table(struct device *dev,
100 struct cpufreq_frequency_table **table)
101{
102 if (!table)
103 return;
104
105 kfree(*table);
106 *table = NULL;
107}
108EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
109#endif /* CONFIG_CPU_FREQ */
110
111void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, bool of)
112{
113 struct device *cpu_dev;
114 int cpu;
115
116 WARN_ON(cpumask_empty(cpumask));
117
118 for_each_cpu(cpu, cpumask) {
119 cpu_dev = get_cpu_device(cpu);
120 if (!cpu_dev) {
121 pr_err("%s: failed to get cpu%d device\n", __func__,
122 cpu);
123 continue;
124 }
125
126 if (of)
127 dev_pm_opp_of_remove_table(cpu_dev);
128 else
129 dev_pm_opp_remove_table(cpu_dev);
130 }
131}
132
133/**
134 * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
135 * @cpumask: cpumask for which OPP table needs to be removed
136 *
137 * This removes the OPP tables for CPUs present in the @cpumask.
138 * This should be used to remove all the OPPs entries associated with
139 * the cpus in @cpumask.
140 */
141void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
142{
143 _dev_pm_opp_cpumask_remove_table(cpumask, false);
144}
145EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
146
147/**
148 * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
149 * @cpu_dev: CPU device for which we do this operation
150 * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev
151 *
152 * This marks OPP table of the @cpu_dev as shared by the CPUs present in
153 * @cpumask.
154 *
155 * Returns -ENODEV if OPP table isn't already present.
156 */
157int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
158 const struct cpumask *cpumask)
159{
160 struct opp_device *opp_dev;
161 struct opp_table *opp_table;
162 struct device *dev;
163 int cpu, ret = 0;
164
165 opp_table = _find_opp_table(cpu_dev);
166 if (IS_ERR(opp_table))
167 return PTR_ERR(opp_table);
168
169 for_each_cpu(cpu, cpumask) {
170 if (cpu == cpu_dev->id)
171 continue;
172
173 dev = get_cpu_device(cpu);
174 if (!dev) {
175 dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
176 __func__, cpu);
177 continue;
178 }
179
180 opp_dev = _add_opp_dev(dev, opp_table);
181 if (!opp_dev) {
182 dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",
183 __func__, cpu);
184 continue;
185 }
186
187 /* Mark opp-table as multiple CPUs are sharing it now */
188 opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
189 }
190
191 dev_pm_opp_put_opp_table(opp_table);
192
193 return ret;
194}
195EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
196
197/**
198 * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
199 * @cpu_dev: CPU device for which we do this operation
200 * @cpumask: cpumask to update with information of sharing CPUs
201 *
202 * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
203 *
204 * Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
205 * table's status is access-unknown.
206 */
207int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
208{
209 struct opp_device *opp_dev;
210 struct opp_table *opp_table;
211 int ret = 0;
212
213 opp_table = _find_opp_table(cpu_dev);
214 if (IS_ERR(opp_table))
215 return PTR_ERR(opp_table);
216
217 if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {
218 ret = -EINVAL;
219 goto put_opp_table;
220 }
221
222 cpumask_clear(cpumask);
223
224 if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
225 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
226 cpumask_set_cpu(opp_dev->dev->id, cpumask);
227 } else {
228 cpumask_set_cpu(cpu_dev->id, cpumask);
229 }
230
231put_opp_table:
232 dev_pm_opp_put_opp_table(opp_table);
233
234 return ret;
235}
236EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);