projects/linux·blob assoc-array-fixes · refs

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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 cpufreq_frequency_table *freq_table = NULL;
47 int i, max_opps, ret = 0;
48 unsigned long rate;
49
50 max_opps = dev_pm_opp_get_opp_count(dev);
51 if (max_opps <= 0)
52 return max_opps ? max_opps : -ENODATA;
53
54 freq_table = kzalloc_objs(*freq_table, (max_opps + 1));
55 if (!freq_table)
56 return -ENOMEM;
57
58 for (i = 0, rate = 0; i < max_opps; i++, rate++) {
59 /* find next rate */
60 struct dev_pm_opp *opp __free(put_opp) =
61 dev_pm_opp_find_freq_ceil(dev, &rate);
62
63 if (IS_ERR(opp)) {
64 ret = PTR_ERR(opp);
65 goto out;
66 }
67 freq_table[i].driver_data = i;
68 freq_table[i].frequency = rate / 1000;
69
70 /* Is Boost/turbo opp ? */
71 if (dev_pm_opp_is_turbo(opp))
72 freq_table[i].flags = CPUFREQ_BOOST_FREQ;
73 }
74
75 freq_table[i].driver_data = i;
76 freq_table[i].frequency = CPUFREQ_TABLE_END;
77
78 *opp_table = &freq_table[0];
79
80out:
81 if (ret)
82 kfree(freq_table);
83
84 return ret;
85}
86EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table);
87
88/**
89 * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
90 * @dev: device for which we do this operation
91 * @opp_table: table to free
92 *
93 * Free up the table allocated by dev_pm_opp_init_cpufreq_table
94 */
95void dev_pm_opp_free_cpufreq_table(struct device *dev,
96 struct cpufreq_frequency_table **opp_table)
97{
98 if (!opp_table)
99 return;
100
101 kfree(*opp_table);
102 *opp_table = NULL;
103}
104EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
105#endif /* CONFIG_CPU_FREQ */
106
107void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask,
108 int last_cpu)
109{
110 struct device *cpu_dev;
111 int cpu;
112
113 WARN_ON(cpumask_empty(cpumask));
114
115 for_each_cpu(cpu, cpumask) {
116 if (cpu == last_cpu)
117 break;
118
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 dev_pm_opp_remove_table(cpu_dev);
127 }
128}
129
130/**
131 * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
132 * @cpumask: cpumask for which OPP table needs to be removed
133 *
134 * This removes the OPP tables for CPUs present in the @cpumask.
135 * This should be used to remove all the OPPs entries associated with
136 * the cpus in @cpumask.
137 */
138void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask)
139{
140 _dev_pm_opp_cpumask_remove_table(cpumask, -1);
141}
142EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table);
143
144/**
145 * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
146 * @cpu_dev: CPU device for which we do this operation
147 * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev
148 *
149 * This marks OPP table of the @cpu_dev as shared by the CPUs present in
150 * @cpumask.
151 *
152 * Returns -ENODEV if OPP table isn't already present.
153 */
154int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev,
155 const struct cpumask *cpumask)
156{
157 struct opp_device *opp_dev;
158 struct device *dev;
159 int cpu;
160
161 struct opp_table *opp_table __free(put_opp_table) =
162 _find_opp_table(cpu_dev);
163
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 return 0;
190}
191EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
192
193/**
194 * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
195 * @cpu_dev: CPU device for which we do this operation
196 * @cpumask: cpumask to update with information of sharing CPUs
197 *
198 * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
199 *
200 * Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
201 * table's status is access-unknown.
202 */
203int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
204{
205 struct opp_device *opp_dev;
206
207 struct opp_table *opp_table __free(put_opp_table) =
208 _find_opp_table(cpu_dev);
209
210 if (IS_ERR(opp_table))
211 return PTR_ERR(opp_table);
212
213 if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN)
214 return -EINVAL;
215
216 cpumask_clear(cpumask);
217
218 if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
219 guard(mutex)(&opp_table->lock);
220 list_for_each_entry(opp_dev, &opp_table->dev_list, node)
221 cpumask_set_cpu(opp_dev->dev->id, cpumask);
222 } else {
223 cpumask_set_cpu(cpu_dev->id, cpumask);
224 }
225
226 return 0;
227}
228EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus);