drivers/gpu/arm/midgard/backend/gpu/mali_kbase_devfreq.c

   1 /*
   2  *
   3  * (C) COPYRIGHT 2014-2016 ARM Limited. All rights reserved.
   4  *
   5  * This program is free software and is provided to you under the terms of the
   6  * GNU General Public License version 2 as published by the Free Software
   7  * Foundation, and any use by you of this program is subject to the terms
   8  * of such GNU licence.
   9  *
  10  * A copy of the licence is included with the program, and can also be obtained
  11  * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  12  * Boston, MA  02110-1301, USA.
  13  *
  14  */
  15
  16
  17 #define ENABLE_DEBUG_LOG
  18 #include "../../platform/rk/custom_log.h"
  19
  20
  21 #include <mali_kbase.h>
  22 #include <mali_kbase_tlstream.h>
  23 #include <mali_kbase_config_defaults.h>
  24 #include <backend/gpu/mali_kbase_pm_internal.h>
  25 #ifdef CONFIG_DEVFREQ_THERMAL
  26 #include <backend/gpu/mali_kbase_power_model_simple.h>
  27 #endif
  28
  29 #include <linux/clk.h>
  30 #include <linux/devfreq.h>
  31 #ifdef CONFIG_DEVFREQ_THERMAL
  32 #include <linux/devfreq_cooling.h>
  33 #endif
  34
  35 #include <linux/version.h>
  36 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0)
  37 #include <linux/pm_opp.h>
  38 #else /* Linux >= 3.13 */
  39 /* In 3.13 the OPP include header file, types, and functions were all
  40  * renamed. Use the old filename for the include, and define the new names to
  41  * the old, when an old kernel is detected.
  42  */
  43 #include <linux/opp.h>
  44 #define dev_pm_opp opp
  45 #define dev_pm_opp_get_voltage opp_get_voltage
  46 #define dev_pm_opp_get_opp_count opp_get_opp_count
  47 #define dev_pm_opp_find_freq_ceil opp_find_freq_ceil
  48 #endif /* Linux >= 3.13 */
  49
  50
  51 static int
  52 kbase_devfreq_target(struct device *dev, unsigned long *target_freq, u32 flags)
  53 {
  54         struct kbase_device *kbdev = dev_get_drvdata(dev);
  55         struct dev_pm_opp *opp;
  56         unsigned long freq = 0;
  57         unsigned long voltage;
  58         int err;
  59
  60         freq = *target_freq;
  61
  62         rcu_read_lock();
  63         opp = devfreq_recommended_opp(dev, &freq, flags);
  64         voltage = dev_pm_opp_get_voltage(opp);
  65         rcu_read_unlock();
  66         if (IS_ERR_OR_NULL(opp)) {
  67                 dev_err(dev, "Failed to get opp (%ld)\n", PTR_ERR(opp));
  68                 return PTR_ERR(opp);
  69         }
  70
  71         /*
  72          * Only update if there is a change of frequency
  73          */
  74         if (kbdev->current_freq == freq) {
  75                 *target_freq = freq;
  76                 return 0;
  77         }
  78
  79 #ifdef CONFIG_REGULATOR
  80         if (kbdev->regulator && kbdev->current_voltage != voltage
  81                         && kbdev->current_freq < freq) {
  82                 err = regulator_set_voltage(kbdev->regulator, voltage, voltage);
  83                 if (err) {
  84                         dev_err(dev, "Failed to increase voltage (%d)\n", err);
  85                         return err;
  86                 }
  87         }
  88 #endif
  89
  90         err = clk_set_rate(kbdev->clock, freq);
  91         if (err) {
  92                 dev_err(dev, "Failed to set clock %lu (target %lu)\n",
  93                                 freq, *target_freq);
  94                 return err;
  95         }
  96
  97 #ifdef CONFIG_REGULATOR
  98         if (kbdev->regulator && kbdev->current_voltage != voltage
  99                         && kbdev->current_freq > freq) {
 100                 err = regulator_set_voltage(kbdev->regulator, voltage, voltage);
 101                 if (err) {
 102                         dev_err(dev, "Failed to decrease voltage (%d)\n", err);
 103                         return err;
 104                 }
 105         }
 106 #endif
 107
 108         *target_freq = freq;
 109         kbdev->current_voltage = voltage;
 110         kbdev->current_freq = freq;
 111
 112         kbase_tlstream_aux_devfreq_target((u64)freq);
 113
 114         kbase_pm_reset_dvfs_utilisation(kbdev);
 115
 116         return err;
 117 }
 118
 119 static int
 120 kbase_devfreq_cur_freq(struct device *dev, unsigned long *freq)
 121 {
 122         struct kbase_device *kbdev = dev_get_drvdata(dev);
 123
 124         *freq = kbdev->current_freq;
 125
 126         return 0;
 127 }
 128
 129 static int
 130 kbase_devfreq_status(struct device *dev, struct devfreq_dev_status *stat)
 131 {
 132         struct kbase_device *kbdev = dev_get_drvdata(dev);
 133
 134         stat->current_frequency = kbdev->current_freq;
 135
 136         kbase_pm_get_dvfs_utilisation(kbdev,
 137                         &stat->total_time, &stat->busy_time);
 138
 139         stat->private_data = NULL;
 140
 141 #ifdef CONFIG_DEVFREQ_THERMAL
 142 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
 143         if (kbdev->devfreq_cooling)
 144                 memcpy(&kbdev->devfreq_cooling->last_status, stat,
 145                                 sizeof(*stat));
 146 #endif
 147 #endif
 148
 149         return 0;
 150 }
 151
 152 static int kbase_devfreq_init_freq_table(struct kbase_device *kbdev,
 153                 struct devfreq_dev_profile *dp)
 154 {
 155         int count;
 156         int i = 0;
 157         unsigned long freq = 0;
 158         struct dev_pm_opp *opp;
 159
 160         rcu_read_lock();
 161         count = dev_pm_opp_get_opp_count(kbdev->dev);
 162         if (count < 0) {
 163                 rcu_read_unlock();
 164                 return count;
 165         }
 166         rcu_read_unlock();
 167
 168         dp->freq_table = kmalloc_array(count, sizeof(dp->freq_table[0]),
 169                                 GFP_KERNEL);
 170         if (!dp->freq_table)
 171                 return -ENOMEM;
 172
 173         rcu_read_lock();
 174         for (i = 0; i < count; i++, freq++) {
 175                 opp = dev_pm_opp_find_freq_ceil(kbdev->dev, &freq);
 176                 if (IS_ERR(opp))
 177                         break;
 178
 179                 dp->freq_table[i] = freq;
 180         }
 181         rcu_read_unlock();
 182
 183         if (count != i)
 184                 dev_warn(kbdev->dev, "Unable to enumerate all OPPs (%d!=%d\n",
 185                                 count, i);
 186
 187         dp->max_state = i;
 188
 189         return 0;
 190 }
 191
 192 static void kbase_devfreq_term_freq_table(struct kbase_device *kbdev)
 193 {
 194         struct devfreq_dev_profile *dp = kbdev->devfreq->profile;
 195
 196         kfree(dp->freq_table);
 197 }
 198
 199 static void kbase_devfreq_exit(struct device *dev)
 200 {
 201         struct kbase_device *kbdev = dev_get_drvdata(dev);
 202
 203         kbase_devfreq_term_freq_table(kbdev);
 204 }
 205
 206 int kbase_devfreq_init(struct kbase_device *kbdev)
 207 {
 208         struct devfreq_dev_profile *dp;
 209         int err;
 210
 211         if (!kbdev->clock)
 212                 return -ENODEV;
 213
 214         kbdev->current_freq = clk_get_rate(kbdev->clock);
 215
 216         dp = &kbdev->devfreq_profile;
 217
 218         dp->initial_freq = kbdev->current_freq;
 219         /* .KP : set devfreq_dvfs_interval_in_ms */
 220         dp->polling_ms = 20;
 221         dp->target = kbase_devfreq_target;
 222         dp->get_dev_status = kbase_devfreq_status;
 223         dp->get_cur_freq = kbase_devfreq_cur_freq;
 224         dp->exit = kbase_devfreq_exit;
 225
 226         if (kbase_devfreq_init_freq_table(kbdev, dp))
 227                 return -EFAULT;
 228
 229         kbdev->devfreq = devfreq_add_device(kbdev->dev, dp,
 230                                 "simple_ondemand", NULL);
 231         if (IS_ERR(kbdev->devfreq)) {
 232                 kbase_devfreq_term_freq_table(kbdev);
 233                 return PTR_ERR(kbdev->devfreq);
 234         }
 235
 236         err = devfreq_register_opp_notifier(kbdev->dev, kbdev->devfreq);
 237         if (err) {
 238                 dev_err(kbdev->dev,
 239                         "Failed to register OPP notifier (%d)\n", err);
 240                 goto opp_notifier_failed;
 241         }
 242
 243 #ifdef CONFIG_DEVFREQ_THERMAL
 244         err = kbase_power_model_simple_init(kbdev);
 245         if (err && err != -ENODEV && err != -EPROBE_DEFER) {
 246                 dev_err(kbdev->dev,
 247                         "Failed to initialize simple power model (%d)\n",
 248                         err);
 249                 goto cooling_failed;
 250         }
 251         if (err == -EPROBE_DEFER)
 252                 goto cooling_failed;
 253         if (err != -ENODEV) {
 254                 kbdev->devfreq_cooling = of_devfreq_cooling_register_power(
 255                                 kbdev->dev->of_node,
 256                                 kbdev->devfreq,
 257                                 &power_model_simple_ops);
 258                 if (IS_ERR_OR_NULL(kbdev->devfreq_cooling)) {
 259                         err = PTR_ERR(kbdev->devfreq_cooling);
 260                         dev_err(kbdev->dev,
 261                                 "Failed to register cooling device (%d)\n",
 262                                 err);
 263                         goto cooling_failed;
 264                 }
 265         } else {
 266                 err = 0;
 267         }
 268         I("success initing power_model_simple.");
 269 #endif
 270
 271         return 0;
 272
 273 #ifdef CONFIG_DEVFREQ_THERMAL
 274 cooling_failed:
 275         devfreq_unregister_opp_notifier(kbdev->dev, kbdev->devfreq);
 276 #endif /* CONFIG_DEVFREQ_THERMAL */
 277 opp_notifier_failed:
 278         if (devfreq_remove_device(kbdev->devfreq))
 279                 dev_err(kbdev->dev, "Failed to terminate devfreq (%d)\n", err);
 280         else
 281                 kbdev->devfreq = NULL;
 282
 283         return err;
 284 }
 285
 286 void kbase_devfreq_term(struct kbase_device *kbdev)
 287 {
 288         int err;
 289
 290         dev_dbg(kbdev->dev, "Term Mali devfreq\n");
 291
 292 #ifdef CONFIG_DEVFREQ_THERMAL
 293         if (kbdev->devfreq_cooling)
 294                 devfreq_cooling_unregister(kbdev->devfreq_cooling);
 295 #endif
 296
 297         devfreq_unregister_opp_notifier(kbdev->dev, kbdev->devfreq);
 298
 299         err = devfreq_remove_device(kbdev->devfreq);
 300         if (err)
 301                 dev_err(kbdev->dev, "Failed to terminate devfreq (%d)\n", err);
 302         else
 303                 kbdev->devfreq = NULL;
 304 }