#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/string.h>
+#ifdef CONFIG_ROCKCHIP_CPUQUIET
+#include <linux/cpuquiet.h>
+#include <linux/pm_qos.h>
+#endif
#include <linux/rockchip/cpu.h>
#include <linux/rockchip/dvfs.h>
#include <asm/smp_plat.h>
#include <linux/module.h>
#include "../../../drivers/clk/rockchip/clk-pd.h"
-#define RK3368_GRF_CPU_CON(n) (0x500 + 4*n)
-
#define VERSION "1.0"
-#define RK_MAX_CLUSTERS 2
+#define MAX_CLUSTERS 2
+#define B_CLUSTER 0
+#define L_CLUSTER 1
#ifdef DEBUG
#define FREQ_DBG(fmt, args...) pr_debug(fmt, ## args)
#endif
#define FREQ_ERR(fmt, args...) pr_err(fmt, ## args)
-/* Frequency table index must be sequential starting at 0 */
-static struct cpufreq_frequency_table default_freq_table[] = {
- {.frequency = 312 * 1000, .index = 875 * 1000},
- {.frequency = 504 * 1000, .index = 925 * 1000},
- {.frequency = 816 * 1000, .index = 975 * 1000},
- {.frequency = 1008 * 1000, .index = 1075 * 1000},
- {.frequency = 1200 * 1000, .index = 1150 * 1000},
- {.frequency = 1416 * 1000, .index = 1250 * 1000},
- {.frequency = 1608 * 1000, .index = 1350 * 1000},
- {.frequency = CPUFREQ_TABLE_END},
-};
-
-static struct cpufreq_frequency_table *freq_table[RK_MAX_CLUSTERS + 1];
+static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS];
/*********************************************************/
/* additional symantics for "relation" in cpufreq with pm */
#define DISABLE_FURTHER_CPUFREQ 0x10
#define ENABLE_FURTHER_CPUFREQ 0x20
#define MASK_FURTHER_CPUFREQ 0x30
+#define CPU_LOW_FREQ 600000 /* KHz */
+#define CCI_LOW_RATE 288000000 /* Hz */
+#define CCI_HIGH_RATE 576000000 /* Hz */
/* With 0x00(NOCHANGE), it depends on the previous "further" status */
#define CPUFREQ_PRIVATE 0x100
-static unsigned int no_cpufreq_access[RK_MAX_CLUSTERS] = { 0 };
-static unsigned int suspend_freq[RK_MAX_CLUSTERS] = { 816 * 1000, 816 * 1000 };
+static unsigned int no_cpufreq_access[MAX_CLUSTERS] = { 0 };
+static unsigned int suspend_freq[MAX_CLUSTERS] = { 816 * 1000, 816 * 1000 };
static unsigned int suspend_volt = 1100000;
-static unsigned int low_battery_freq[RK_MAX_CLUSTERS] = { 600 * 1000,
+static unsigned int low_battery_freq[MAX_CLUSTERS] = { 600 * 1000,
600 * 1000 };
static unsigned int low_battery_capacity = 5;
static bool is_booting = true;
static DEFINE_MUTEX(cpufreq_mutex);
-static struct dvfs_node *clk_cpu_dvfs_node[RK_MAX_CLUSTERS];
+static struct dvfs_node *clk_cpu_dvfs_node[MAX_CLUSTERS];
static struct dvfs_node *clk_gpu_dvfs_node;
static struct dvfs_node *clk_ddr_dvfs_node;
-static u32 cluster_policy_cpu[RK_MAX_CLUSTERS];
-static unsigned int big_little = 1;
+static cpumask_var_t cluster_policy_mask[MAX_CLUSTERS];
+static struct clk *aclk_cci;
+static unsigned long cci_rate;
+static unsigned int cpu_bl_freq[MAX_CLUSTERS];
+
+#ifdef CONFIG_ROCKCHIP_CPUQUIET
+static void rockchip_bl_balanced_cpufreq_transition(unsigned int cluster,
+ unsigned int cpu_freq);
+static struct cpuquiet_governor rockchip_bl_balanced_governor;
+#endif
/*******************************************************/
static inline int cpu_to_cluster(int cpu)
.notifier_call = rockchip_bl_cpufreq_notifier_policy
};
+static int rockchip_bl_cpufreq_notifier_trans(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ struct cpufreq_freqs *freq = data;
+ unsigned int cluster = cpu_to_cluster(freq->cpu);
+ int ret;
+
+ cpu_bl_freq[cluster] = freq->new;
+
+ switch (val) {
+ case CPUFREQ_PRECHANGE:
+ if (cpu_bl_freq[B_CLUSTER] > CPU_LOW_FREQ ||
+ cpu_bl_freq[L_CLUSTER] > CPU_LOW_FREQ) {
+ if (cci_rate != CCI_HIGH_RATE) {
+ ret = clk_set_rate(aclk_cci, CCI_HIGH_RATE);
+ if (ret)
+ break;
+ pr_debug("ccirate %ld-->%d Hz\n",
+ cci_rate, CCI_HIGH_RATE);
+ cci_rate = CCI_HIGH_RATE;
+ }
+ }
+ break;
+ case CPUFREQ_POSTCHANGE:
+ if (cpu_bl_freq[B_CLUSTER] <= CPU_LOW_FREQ &&
+ cpu_bl_freq[L_CLUSTER] <= CPU_LOW_FREQ) {
+ if (cci_rate != CCI_LOW_RATE) {
+ ret = clk_set_rate(aclk_cci, CCI_LOW_RATE);
+ if (ret)
+ break;
+ pr_debug("ccirate %ld-->%d Hz\n",
+ cci_rate, CCI_LOW_RATE);
+ cci_rate = CCI_LOW_RATE;
+ }
+ }
+ break;
+ }
+
+ return 0;
+}
+
+static struct notifier_block notifier_trans_block = {
+ .notifier_call = rockchip_bl_cpufreq_notifier_trans,
+};
+
static int rockchip_bl_cpufreq_verify(struct cpufreq_policy *policy)
{
u32 cur_cluster = cpu_to_cluster(policy->cpu);
{
int i;
- for (i = 0; i < RK_MAX_CLUSTERS; i++) {
+ for (i = 0; i < MAX_CLUSTERS; i++) {
if (clk_cpu_dvfs_node[i]->clk == clk)
return i;
}
int ret;
struct cpufreq_freqs freqs;
struct cpufreq_policy *policy;
- u32 cur_cluster;
+ u32 cur_cluster, cpu;
cur_cluster = clk_node_get_cluster_id(clk);
- policy = cpufreq_cpu_get(cluster_policy_cpu[cur_cluster]);
+ cpu = cpumask_first_and(cluster_policy_mask[cur_cluster],
+ cpu_online_mask);
+ if (cpu >= nr_cpu_ids)
+ return -EINVAL;
+ policy = cpufreq_cpu_get(cpu);
+ if (!policy)
+ return -EINVAL;
freqs.new = rate / 1000;
freqs.old = clk_get_rate(clk) / 1000;
ret = clk_set_rate(clk, rate);
freqs.new = clk_get_rate(clk) / 1000;
+
+#ifdef CONFIG_ROCKCHIP_CPUQUIET
+ rockchip_bl_balanced_cpufreq_transition(cur_cluster, freqs.new);
+#endif
+
/* notifiers */
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
static int cluster_cpus_freq_dvfs_init(u32 cluster_id, char *dvfs_name)
{
+ int v = INT_MAX;
+ int i;
+
clk_cpu_dvfs_node[cluster_id] = clk_get_dvfs_node(dvfs_name);
if (!clk_cpu_dvfs_node[cluster_id]) {
rockchip_bl_cpufreq_scale_rate_for_dvfs);
freq_table[cluster_id] =
dvfs_get_freq_volt_table(clk_cpu_dvfs_node[cluster_id]);
- if (freq_table[cluster_id] == NULL) {
- freq_table[cluster_id] = default_freq_table;
- } else {
- int v = INT_MAX;
- int i;
-
- for (i = 0; freq_table[cluster_id][i].frequency !=
- CPUFREQ_TABLE_END; i++) {
- if (freq_table[cluster_id][i].index >= suspend_volt &&
- v > freq_table[cluster_id][i].index) {
- suspend_freq[cluster_id] =
- freq_table[cluster_id][i].frequency;
- v = freq_table[cluster_id][i].index;
- }
+ if (!freq_table[cluster_id]) {
+ FREQ_ERR("No freq table for cluster %d\n", cluster_id);
+ return -EINVAL;
+ }
+
+ for (i = 0; freq_table[cluster_id][i].frequency != CPUFREQ_TABLE_END;
+ i++) {
+ if (freq_table[cluster_id][i].index >= suspend_volt &&
+ v > freq_table[cluster_id][i].index) {
+ suspend_freq[cluster_id] =
+ freq_table[cluster_id][i].frequency;
+ v = freq_table[cluster_id][i].index;
}
}
low_battery_freq[cluster_id] =
if (clk_ddr_dvfs_node)
clk_enable_dvfs(clk_ddr_dvfs_node);
- cluster_cpus_freq_dvfs_init(0, "clk_core_b");
- cluster_cpus_freq_dvfs_init(1, "clk_core_l");
+ cluster_cpus_freq_dvfs_init(B_CLUSTER, "clk_core_b");
+ cluster_cpus_freq_dvfs_init(L_CLUSTER, "clk_core_l");
cpufreq_register_notifier(¬ifier_policy_block,
CPUFREQ_POLICY_NOTIFIER);
+ aclk_cci = clk_get(NULL, "aclk_cci");
+ if (!IS_ERR(aclk_cci)) {
+ cci_rate = clk_get_rate(aclk_cci);
+ if (clk_cpu_dvfs_node[L_CLUSTER])
+ cpu_bl_freq[L_CLUSTER] =
+ clk_get_rate(clk_cpu_dvfs_node[L_CLUSTER]->clk) / 1000;
+ if (clk_cpu_dvfs_node[B_CLUSTER])
+ cpu_bl_freq[B_CLUSTER] =
+ clk_get_rate(clk_cpu_dvfs_node[B_CLUSTER]->clk) / 1000;
+ cpufreq_register_notifier(¬ifier_trans_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+
pr_info("version " VERSION ", suspend freq %d %d MHz\n",
suspend_freq[0] / 1000, suspend_freq[1] / 1000);
return 0;
if (cpu0_err)
return cpu0_err;
- cluster_policy_cpu[cur_cluster] = policy->cpu;
-
/* set freq min max */
cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
/* sys nod */
cpufreq_frequency_table_get_attr(freq_table[cur_cluster], policy->cpu);
- if (cur_cluster < RK_MAX_CLUSTERS)
+ if (cur_cluster < MAX_CLUSTERS) {
cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
+ cpumask_copy(cluster_policy_mask[cur_cluster],
+ topology_core_cpumask(policy->cpu));
+ }
policy->cur = clk_get_rate(clk_cpu_dvfs_node[cur_cluster]->clk) / 1000;
{
int ret = NOTIFY_DONE;
int i;
-
- for (i = 0; i < RK_MAX_CLUSTERS; i++) {
- struct cpufreq_policy *policy =
- cpufreq_cpu_get(cluster_policy_cpu[i]);
-
+ struct cpufreq_policy *policy;
+ u32 cpu;
+
+ for (i = 0; i < MAX_CLUSTERS; i++) {
+ cpu = cpumask_first_and(cluster_policy_mask[i],
+ cpu_online_mask);
+ if (cpu >= nr_cpu_ids)
+ continue;
+ policy = cpufreq_cpu_get(cpu);
if (!policy)
- return ret;
+ continue;
if (!cpufreq_is_ondemand(policy))
goto out;
out:
cpufreq_cpu_put(policy);
}
+
return ret;
}
dvfs_disable_temp_limit();
- for (i = 0; i < RK_MAX_CLUSTERS; i++) {
+ for (i = 0; i < MAX_CLUSTERS; i++) {
dvfs_clk_enable_limit(clk_cpu_dvfs_node[i],
1000 * suspend_freq[i],
1000 * suspend_freq[i]);
};
MODULE_DEVICE_TABLE(of, rockchip_bl_cpufreq_match);
-static int rockchip_bl_cpufreq_probe(struct platform_device *pdev)
+static int __init rockchip_bl_cpufreq_probe(struct platform_device *pdev)
{
- struct device_node *np;
- struct regmap *grf_regmap;
- unsigned int big_bits, litt_bits;
- int ret;
+ int ret, i;
- np = pdev->dev.of_node;
- if (!np)
- return -ENODEV;
-
- grf_regmap = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
- if (IS_ERR(grf_regmap)) {
- FREQ_ERR("Cpufreq couldn't find grf regmap\n");
- return PTR_ERR(grf_regmap);
- }
- ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(3), &big_bits);
- if (ret != 0) {
- FREQ_ERR("Cpufreq couldn't read to GRF\n");
- return -1;
+ for (i = 0; i < MAX_CLUSTERS; i++) {
+ if (!alloc_cpumask_var(&cluster_policy_mask[i], GFP_KERNEL))
+ return -ENOMEM;
}
- ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(1), &litt_bits);
- if (ret != 0) {
- FREQ_ERR("Cpufreq couldn't read to GRF\n");
- return -1;
- }
-
- big_bits = (big_bits >> 8) & 0x03;
- litt_bits = (litt_bits >> 8) & 0x03;
-
- if (big_bits == 0x01 && litt_bits == 0x00)
- big_little = 1;
- else if (big_bits == 0x0 && litt_bits == 0x01)
- big_little = 0;
- pr_info("boot from %d\n", big_little);
register_reboot_notifier(&rockchip_bl_cpufreq_reboot_notifier);
register_pm_notifier(&rockchip_bl_cpufreq_pm_notifier);
- return cpufreq_register_driver(&rockchip_bl_cpufreq_driver);
+ ret = cpufreq_register_driver(&rockchip_bl_cpufreq_driver);
+
+#ifdef CONFIG_ROCKCHIP_CPUQUIET
+ ret = cpuquiet_register_governor(&rockchip_bl_balanced_governor);
+#endif
+
+ return ret;
}
static int rockchip_bl_cpufreq_remove(struct platform_device *pdev)
{
+ int i;
+
+ for (i = 0; i < MAX_CLUSTERS; i++)
+ free_cpumask_var(cluster_policy_mask[i]);
cpufreq_unregister_driver(&rockchip_bl_cpufreq_driver);
return 0;
}
.owner = THIS_MODULE,
.of_match_table = rockchip_bl_cpufreq_match,
},
- .probe = rockchip_bl_cpufreq_probe,
.remove = rockchip_bl_cpufreq_remove,
};
-module_platform_driver(rockchip_bl_cpufreq_platdrv);
+module_platform_driver_probe(rockchip_bl_cpufreq_platdrv,
+ rockchip_bl_cpufreq_probe);
MODULE_AUTHOR("Xiao Feng <xf@rock-chips.com>");
MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_ROCKCHIP_CPUQUIET
+extern struct cpumask hmp_slow_cpu_mask;
+
+enum cpu_speed_balance {
+ CPU_SPEED_BALANCED,
+ CPU_SPEED_BIASED,
+ CPU_SPEED_SKEWED,
+ CPU_SPEED_BOOST,
+};
+
+enum balanced_state {
+ IDLE,
+ DOWN,
+ UP,
+};
+
+struct idle_info {
+ u64 idle_last_us;
+ u64 idle_current_us;
+};
+
+static u64 idleinfo_timestamp_us;
+static u64 idleinfo_last_timestamp_us;
+static DEFINE_PER_CPU(struct idle_info, idleinfo);
+static DEFINE_PER_CPU(unsigned int, cpu_load);
+
+static struct timer_list load_timer;
+static bool load_timer_active;
+
+/* configurable parameters */
+static unsigned int balance_level = 60;
+static unsigned int idle_bottom_freq[MAX_CLUSTERS];
+static unsigned int idle_top_freq[MAX_CLUSTERS];
+static unsigned int cpu_freq[MAX_CLUSTERS];
+static unsigned long up_delay_jiffies;
+static unsigned long down_delay_jiffies;
+static unsigned long last_change_time_jiffies;
+static unsigned int load_sample_rate_jiffies = 20 / (MSEC_PER_SEC / HZ);
+static unsigned int little_high_load = 80;
+static unsigned int little_low_load = 20;
+static unsigned int big_low_load = 20;
+static struct workqueue_struct *rockchip_bl_balanced_wq;
+static struct delayed_work rockchip_bl_balanced_work;
+static enum balanced_state rockchip_bl_balanced_state;
+static struct kobject *rockchip_bl_balanced_kobj;
+static DEFINE_MUTEX(rockchip_bl_balanced_lock);
+static bool rockchip_bl_balanced_enable;
+
+#define GOVERNOR_NAME "bl_balanced"
+
+static u64 get_idle_us(int cpu)
+{
+ return get_cpu_idle_time(cpu, NULL, 1 /* io_busy */);
+}
+
+static void calculate_load_timer(unsigned long data)
+{
+ int i;
+ u64 elapsed_time;
+
+ if (!load_timer_active)
+ return;
+
+ idleinfo_last_timestamp_us = idleinfo_timestamp_us;
+ idleinfo_timestamp_us = ktime_to_us(ktime_get());
+ elapsed_time = idleinfo_timestamp_us - idleinfo_last_timestamp_us;
+
+ for_each_present_cpu(i) {
+ struct idle_info *iinfo = &per_cpu(idleinfo, i);
+ unsigned int *load = &per_cpu(cpu_load, i);
+ u64 idle_time;
+
+ iinfo->idle_last_us = iinfo->idle_current_us;
+ iinfo->idle_current_us = get_idle_us(i);
+
+ idle_time = iinfo->idle_current_us - iinfo->idle_last_us;
+ idle_time *= 100;
+ do_div(idle_time, elapsed_time);
+ if (idle_time > 100)
+ idle_time = 100;
+ *load = 100 - idle_time;
+ }
+ mod_timer(&load_timer, jiffies + load_sample_rate_jiffies);
+}
+
+static void start_load_timer(void)
+{
+ int i;
+
+ if (load_timer_active)
+ return;
+
+ idleinfo_timestamp_us = ktime_to_us(ktime_get());
+ for_each_present_cpu(i) {
+ struct idle_info *iinfo = &per_cpu(idleinfo, i);
+
+ iinfo->idle_current_us = get_idle_us(i);
+ }
+ mod_timer(&load_timer, jiffies + load_sample_rate_jiffies);
+
+ load_timer_active = true;
+}
+
+static void stop_load_timer(void)
+{
+ if (!load_timer_active)
+ return;
+
+ load_timer_active = false;
+ del_timer(&load_timer);
+}
+
+static unsigned int get_slowest_cpu(void)
+{
+ unsigned int cpu = nr_cpu_ids;
+ unsigned long minload = ULONG_MAX;
+ int i;
+
+ for_each_online_cpu(i) {
+ unsigned int load = per_cpu(cpu_load, i);
+
+ if ((i > 0) && (minload >= load)) {
+ cpu = i;
+ minload = load;
+ }
+ }
+
+ return cpu;
+}
+
+static unsigned int get_offline_big_cpu(void)
+{
+ struct cpumask big, offline_big;
+
+ cpumask_andnot(&big, cpu_present_mask, &hmp_slow_cpu_mask);
+ cpumask_andnot(&offline_big, &big, cpu_online_mask);
+ return cpumask_first(&offline_big);
+}
+
+static unsigned int cpu_highest_speed(void)
+{
+ unsigned int maxload = 0;
+ int i;
+
+ for_each_online_cpu(i) {
+ unsigned int load = per_cpu(cpu_load, i);
+
+ maxload = max(maxload, load);
+ }
+
+ return maxload;
+}
+
+static unsigned int count_slow_cpus(unsigned int limit)
+{
+ unsigned int cnt = 0;
+ int i;
+
+ for_each_online_cpu(i) {
+ unsigned int load = per_cpu(cpu_load, i);
+
+ if (load <= limit)
+ cnt++;
+ }
+
+ return cnt;
+}
+
+#define NR_FSHIFT 2
+
+static unsigned int rt_profile[NR_CPUS] = {
+/* 1, 2, 3, 4, 5, 6, 7, 8 - on-line cpus target */
+ 5, 9, 10, 11, 12, 13, 14, UINT_MAX
+};
+
+static unsigned int nr_run_hysteresis = 2; /* 0.5 thread */
+static unsigned int nr_run_last;
+
+struct runnables_avg_sample {
+ u64 previous_integral;
+ unsigned int avg;
+ bool integral_sampled;
+ u64 prev_timestamp; /* ns */
+};
+
+static DEFINE_PER_CPU(struct runnables_avg_sample, avg_nr_sample);
+
+static unsigned int get_avg_nr_runnables(void)
+{
+ unsigned int i, sum = 0;
+ struct runnables_avg_sample *sample;
+ u64 integral, old_integral, delta_integral, delta_time, cur_time;
+
+ cur_time = ktime_to_ns(ktime_get());
+
+ for_each_online_cpu(i) {
+ sample = &per_cpu(avg_nr_sample, i);
+ integral = nr_running_integral(i);
+ old_integral = sample->previous_integral;
+ sample->previous_integral = integral;
+ delta_time = cur_time - sample->prev_timestamp;
+ sample->prev_timestamp = cur_time;
+
+ if (!sample->integral_sampled) {
+ sample->integral_sampled = true;
+ /* First sample to initialize prev_integral, skip
+ * avg calculation
+ */
+ continue;
+ }
+
+ if (integral < old_integral) {
+ /* Overflow */
+ delta_integral = (ULLONG_MAX - old_integral) + integral;
+ } else {
+ delta_integral = integral - old_integral;
+ }
+
+ /* Calculate average for the previous sample window */
+ do_div(delta_integral, delta_time);
+ sample->avg = delta_integral;
+ sum += sample->avg;
+ }
+
+ return sum;
+}
+
+static bool rockchip_bl_balanced_speed_boost(void)
+{
+ unsigned int cpu;
+ struct cpumask online_little;
+ unsigned int big_cpu;
+ bool has_low_load_little_cpu = false;
+
+ if (cpu_freq[L_CLUSTER] < idle_top_freq[L_CLUSTER])
+ return false;
+
+ cpumask_and(&online_little, cpu_online_mask, &hmp_slow_cpu_mask);
+
+ for_each_cpu(cpu, &online_little) {
+ if (per_cpu(cpu_load, cpu) < little_low_load) {
+ has_low_load_little_cpu = true;
+ break;
+ }
+ }
+
+ for_each_cpu(cpu, &online_little) {
+ unsigned int load;
+ unsigned int avg;
+ struct cpumask online_big;
+ bool has_low_load_big_cpu;
+
+ load = per_cpu(cpu_load, cpu);
+ /* skip low load cpu */
+ if (load < little_high_load)
+ continue;
+
+ avg = per_cpu(avg_nr_sample, cpu).avg;
+ /*
+ * skip when we have low load cpu,
+ * when cpu load is high because run many task.
+ * we can migrate the task to low load cpu
+ */
+ if (has_low_load_little_cpu &&
+ (avg >> (FSHIFT - NR_FSHIFT)) >= 4)
+ continue;
+
+ /*
+ * found one cpu which is busy by run one thread,
+ * break if no big cpu offline
+ */
+ if (get_offline_big_cpu() >= nr_cpu_ids)
+ break;
+
+ cpumask_andnot(&online_big,
+ cpu_online_mask, &hmp_slow_cpu_mask);
+
+ has_low_load_big_cpu = false;
+ for_each_cpu(big_cpu, &online_big) {
+ unsigned int big_load;
+
+ big_load = per_cpu(cpu_load, big_cpu);
+ if (big_load < big_low_load) {
+ has_low_load_big_cpu = true;
+ break;
+ }
+ }
+ /* if we have idle big cpu, never up new one */
+ if (has_low_load_big_cpu)
+ break;
+
+ return true;
+ }
+
+ return false;
+}
+
+static enum cpu_speed_balance rockchip_bl_balanced_speed_balance(void)
+{
+ unsigned long highest_speed = cpu_highest_speed();
+ unsigned long balanced_speed = highest_speed * balance_level / 100;
+ unsigned long skewed_speed = balanced_speed / 2;
+ unsigned int nr_cpus = num_online_cpus();
+ unsigned int max_cpus = pm_qos_request(PM_QOS_MAX_ONLINE_CPUS);
+ unsigned int min_cpus = pm_qos_request(PM_QOS_MIN_ONLINE_CPUS);
+ unsigned int avg_nr_run = get_avg_nr_runnables();
+ unsigned int nr_run;
+
+ if (max_cpus > nr_cpu_ids || max_cpus == 0)
+ max_cpus = nr_cpu_ids;
+
+ if (rockchip_bl_balanced_speed_boost())
+ return CPU_SPEED_BOOST;
+
+ /* balanced: freq targets for all CPUs are above 60% of highest speed
+ biased: freq target for at least one CPU is below 60% threshold
+ skewed: freq targets for at least 2 CPUs are below 30% threshold */
+ for (nr_run = 1; nr_run < ARRAY_SIZE(rt_profile); nr_run++) {
+ unsigned int nr_threshold = rt_profile[nr_run - 1];
+
+ if (nr_run_last <= nr_run)
+ nr_threshold += nr_run_hysteresis;
+ if (avg_nr_run <= (nr_threshold << (FSHIFT - NR_FSHIFT)))
+ break;
+ }
+ nr_run_last = nr_run;
+
+ if ((count_slow_cpus(skewed_speed) >= 2 ||
+ nr_run < nr_cpus ||
+ (cpu_freq[B_CLUSTER] <= idle_bottom_freq[B_CLUSTER] &&
+ cpu_freq[L_CLUSTER] <= idle_bottom_freq[L_CLUSTER]) ||
+ nr_cpus > max_cpus) &&
+ nr_cpus > min_cpus)
+ return CPU_SPEED_SKEWED;
+
+ if ((count_slow_cpus(balanced_speed) >= 1 ||
+ nr_run <= nr_cpus ||
+ (cpu_freq[B_CLUSTER] <= idle_bottom_freq[B_CLUSTER] &&
+ cpu_freq[L_CLUSTER] <= idle_bottom_freq[L_CLUSTER]) ||
+ nr_cpus == max_cpus) &&
+ nr_cpus >= min_cpus)
+ return CPU_SPEED_BIASED;
+
+ return CPU_SPEED_BALANCED;
+}
+
+static void rockchip_bl_balanced_work_func(struct work_struct *work)
+{
+ bool up = false;
+ unsigned int cpu = nr_cpu_ids;
+ unsigned long now = jiffies;
+ struct workqueue_struct *wq = rockchip_bl_balanced_wq;
+ struct delayed_work *dwork = to_delayed_work(work);
+ enum cpu_speed_balance balance;
+
+ mutex_lock(&rockchip_bl_balanced_lock);
+
+ if (!rockchip_bl_balanced_enable)
+ goto out;
+
+ switch (rockchip_bl_balanced_state) {
+ case IDLE:
+ break;
+ case DOWN:
+ cpu = get_slowest_cpu();
+ if (cpu < nr_cpu_ids) {
+ up = false;
+ queue_delayed_work(wq, dwork, up_delay_jiffies);
+ } else {
+ stop_load_timer();
+ }
+ break;
+ case UP:
+ balance = rockchip_bl_balanced_speed_balance();
+ switch (balance) {
+ case CPU_SPEED_BOOST:
+ cpu = get_offline_big_cpu();
+ if (cpu < nr_cpu_ids)
+ up = true;
+ break;
+ /* cpu speed is up and balanced - one more on-line */
+ case CPU_SPEED_BALANCED:
+ cpu = cpumask_next_zero(0, cpu_online_mask);
+ if (cpu < nr_cpu_ids)
+ up = true;
+ break;
+ /* cpu speed is up, but skewed - remove one core */
+ case CPU_SPEED_SKEWED:
+ cpu = get_slowest_cpu();
+ if (cpu < nr_cpu_ids)
+ up = false;
+ break;
+ /* cpu speed is up, but under-utilized - do nothing */
+ case CPU_SPEED_BIASED:
+ default:
+ break;
+ }
+ queue_delayed_work(wq, dwork, up_delay_jiffies);
+ break;
+ default:
+ pr_err("%s: invalid cpuquiet governor state %d\n",
+ __func__, rockchip_bl_balanced_state);
+ }
+
+ if (!up && ((now - last_change_time_jiffies) < down_delay_jiffies))
+ cpu = nr_cpu_ids;
+
+ if (cpu < nr_cpu_ids) {
+ last_change_time_jiffies = now;
+ if (up)
+ cpuquiet_wake_cpu(cpu, false);
+ else
+ cpuquiet_quiesence_cpu(cpu, false);
+ }
+
+out:
+ mutex_unlock(&rockchip_bl_balanced_lock);
+}
+
+static void rockchip_bl_balanced_cpufreq_transition(unsigned int cluster,
+ unsigned int new_cpu_freq)
+{
+ struct workqueue_struct *wq;
+ struct delayed_work *dwork;
+
+ mutex_lock(&rockchip_bl_balanced_lock);
+
+ if (!rockchip_bl_balanced_enable)
+ goto out;
+
+ wq = rockchip_bl_balanced_wq;
+ dwork = &rockchip_bl_balanced_work;
+ cpu_freq[cluster] = new_cpu_freq;
+
+ switch (rockchip_bl_balanced_state) {
+ case IDLE:
+ if (cpu_freq[B_CLUSTER] >= idle_top_freq[B_CLUSTER] ||
+ cpu_freq[L_CLUSTER] >= idle_top_freq[L_CLUSTER]) {
+ rockchip_bl_balanced_state = UP;
+ queue_delayed_work(wq, dwork, up_delay_jiffies);
+ start_load_timer();
+ } else if (cpu_freq[B_CLUSTER] <= idle_bottom_freq[B_CLUSTER] &&
+ cpu_freq[L_CLUSTER] <= idle_bottom_freq[L_CLUSTER]) {
+ rockchip_bl_balanced_state = DOWN;
+ queue_delayed_work(wq, dwork, down_delay_jiffies);
+ start_load_timer();
+ }
+ break;
+ case DOWN:
+ if (cpu_freq[B_CLUSTER] >= idle_top_freq[B_CLUSTER] ||
+ cpu_freq[L_CLUSTER] >= idle_top_freq[L_CLUSTER]) {
+ rockchip_bl_balanced_state = UP;
+ queue_delayed_work(wq, dwork, up_delay_jiffies);
+ start_load_timer();
+ }
+ break;
+ case UP:
+ if (cpu_freq[B_CLUSTER] <= idle_bottom_freq[B_CLUSTER] &&
+ cpu_freq[L_CLUSTER] <= idle_bottom_freq[L_CLUSTER]) {
+ rockchip_bl_balanced_state = DOWN;
+ queue_delayed_work(wq, dwork, up_delay_jiffies);
+ start_load_timer();
+ }
+ break;
+ default:
+ pr_err("%s: invalid cpuquiet governor state %d\n",
+ __func__, rockchip_bl_balanced_state);
+ }
+
+out:
+ mutex_unlock(&rockchip_bl_balanced_lock);
+}
+
+static void delay_callback(struct cpuquiet_attribute *attr)
+{
+ unsigned long val;
+
+ if (attr) {
+ val = (*((unsigned long *)(attr->param)));
+ (*((unsigned long *)(attr->param))) = msecs_to_jiffies(val);
+ }
+}
+
+#define CPQ_BASIC_ATTRIBUTE_B(_name, _mode, _type) \
+ static struct cpuquiet_attribute _name ## _b_attr = { \
+ .attr = {.name = __stringify(_name ## _b), .mode = _mode },\
+ .show = show_ ## _type ## _attribute, \
+ .store = store_ ## _type ## _attribute, \
+ .param = &_name[B_CLUSTER], \
+}
+#define CPQ_BASIC_ATTRIBUTE_L(_name, _mode, _type) \
+ static struct cpuquiet_attribute _name ## _l_attr = { \
+ .attr = {.name = __stringify(_name ## _l), .mode = _mode },\
+ .show = show_ ## _type ## _attribute, \
+ .store = store_ ## _type ## _attribute, \
+ .param = &_name[L_CLUSTER], \
+}
+CPQ_BASIC_ATTRIBUTE(balance_level, 0644, uint);
+CPQ_BASIC_ATTRIBUTE_B(idle_bottom_freq, 0644, uint);
+CPQ_BASIC_ATTRIBUTE_L(idle_bottom_freq, 0644, uint);
+CPQ_BASIC_ATTRIBUTE_B(idle_top_freq, 0644, uint);
+CPQ_BASIC_ATTRIBUTE_L(idle_top_freq, 0644, uint);
+CPQ_BASIC_ATTRIBUTE(load_sample_rate_jiffies, 0644, uint);
+CPQ_BASIC_ATTRIBUTE(nr_run_hysteresis, 0644, uint);
+CPQ_BASIC_ATTRIBUTE(little_high_load, 0644, uint);
+CPQ_BASIC_ATTRIBUTE(little_low_load, 0644, uint);
+CPQ_BASIC_ATTRIBUTE(big_low_load, 0644, uint);
+CPQ_ATTRIBUTE(up_delay_jiffies, 0644, ulong, delay_callback);
+CPQ_ATTRIBUTE(down_delay_jiffies, 0644, ulong, delay_callback);
+
+#define MAX_BYTES 100
+
+static ssize_t show_rt_profile(struct cpuquiet_attribute *attr, char *buf)
+{
+ char buffer[MAX_BYTES];
+ unsigned int i;
+ int size = 0;
+
+ buffer[0] = 0;
+ for (i = 0; i < ARRAY_SIZE(rt_profile); i++) {
+ size += snprintf(buffer + size, sizeof(buffer) - size,
+ "%u ", rt_profile[i]);
+ }
+ return snprintf(buf, sizeof(buffer), "%s\n", buffer);
+}
+
+static ssize_t store_rt_profile(struct cpuquiet_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret, i = 0;
+ char *val, *str, input[MAX_BYTES];
+ unsigned int profile[ARRAY_SIZE(rt_profile)];
+
+ if (!count || count >= MAX_BYTES)
+ return -EINVAL;
+ strncpy(input, buf, count);
+ input[count] = '\0';
+ str = input;
+ memcpy(profile, rt_profile, sizeof(rt_profile));
+ while ((val = strsep(&str, " ")) != NULL) {
+ if (*val == '\0')
+ continue;
+ if (i == ARRAY_SIZE(rt_profile) - 1)
+ break;
+ ret = kstrtouint(val, 10, &profile[i]);
+ if (ret)
+ return -EINVAL;
+ i++;
+ }
+
+ memcpy(rt_profile, profile, sizeof(profile));
+
+ return count;
+}
+CPQ_ATTRIBUTE_CUSTOM(rt_profile, 0644,
+ show_rt_profile, store_rt_profile);
+
+static struct attribute *rockchip_bl_balanced_attributes[] = {
+ &balance_level_attr.attr,
+ &idle_bottom_freq_b_attr.attr,
+ &idle_bottom_freq_l_attr.attr,
+ &idle_top_freq_b_attr.attr,
+ &idle_top_freq_l_attr.attr,
+ &up_delay_jiffies_attr.attr,
+ &down_delay_jiffies_attr.attr,
+ &load_sample_rate_jiffies_attr.attr,
+ &nr_run_hysteresis_attr.attr,
+ &rt_profile_attr.attr,
+ &little_high_load_attr.attr,
+ &little_low_load_attr.attr,
+ &big_low_load_attr.attr,
+ NULL,
+};
+
+static const struct sysfs_ops rockchip_bl_balanced_sysfs_ops = {
+ .show = cpuquiet_auto_sysfs_show,
+ .store = cpuquiet_auto_sysfs_store,
+};
+
+static struct kobj_type rockchip_bl_balanced_ktype = {
+ .sysfs_ops = &rockchip_bl_balanced_sysfs_ops,
+ .default_attrs = rockchip_bl_balanced_attributes,
+};
+
+static int rockchip_bl_balanced_sysfs(void)
+{
+ int err;
+ struct kobject *kobj;
+
+ kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
+
+ if (!kobj)
+ return -ENOMEM;
+
+ err = cpuquiet_kobject_init(kobj, &rockchip_bl_balanced_ktype,
+ GOVERNOR_NAME);
+
+ if (err)
+ kfree(kobj);
+
+ rockchip_bl_balanced_kobj = kobj;
+
+ return err;
+}
+
+static void rockchip_bl_balanced_stop(void)
+{
+ mutex_lock(&rockchip_bl_balanced_lock);
+
+ rockchip_bl_balanced_enable = false;
+ /* now we can force the governor to be idle */
+ rockchip_bl_balanced_state = IDLE;
+
+ mutex_unlock(&rockchip_bl_balanced_lock);
+
+ cancel_delayed_work_sync(&rockchip_bl_balanced_work);
+
+ destroy_workqueue(rockchip_bl_balanced_wq);
+ rockchip_bl_balanced_wq = NULL;
+ del_timer_sync(&load_timer);
+
+ kobject_put(rockchip_bl_balanced_kobj);
+ kfree(rockchip_bl_balanced_kobj);
+ rockchip_bl_balanced_kobj = NULL;
+}
+
+static int rockchip_bl_balanced_start(void)
+{
+ int err, count, cluster;
+ struct cpufreq_frequency_table *table;
+ unsigned int initial_freq;
+
+ err = rockchip_bl_balanced_sysfs();
+ if (err)
+ return err;
+
+ up_delay_jiffies = msecs_to_jiffies(100);
+ down_delay_jiffies = msecs_to_jiffies(2000);
+
+ for (cluster = 0; cluster < MAX_CLUSTERS; cluster++) {
+ table = freq_table[cluster];
+ if (!table)
+ return -EINVAL;
+
+ for (count = 0; table[count].frequency != CPUFREQ_TABLE_END;
+ count++)
+ ;
+
+ if (count < 4)
+ return -EINVAL;
+
+ idle_top_freq[cluster] = table[(count / 2) - 1].frequency;
+ idle_bottom_freq[cluster] = table[(count / 2) - 2].frequency;
+ }
+
+ rockchip_bl_balanced_wq
+ = alloc_workqueue(GOVERNOR_NAME, WQ_UNBOUND | WQ_FREEZABLE, 1);
+ if (!rockchip_bl_balanced_wq)
+ return -ENOMEM;
+
+ INIT_DELAYED_WORK(&rockchip_bl_balanced_work,
+ rockchip_bl_balanced_work_func);
+
+ init_timer(&load_timer);
+ load_timer.function = calculate_load_timer;
+
+ mutex_lock(&rockchip_bl_balanced_lock);
+ rockchip_bl_balanced_enable = true;
+ if (clk_cpu_dvfs_node[L_CLUSTER])
+ cpu_freq[L_CLUSTER] =
+ clk_get_rate(clk_cpu_dvfs_node[L_CLUSTER]->clk) / 1000;
+ if (clk_cpu_dvfs_node[B_CLUSTER])
+ cpu_freq[B_CLUSTER] =
+ clk_get_rate(clk_cpu_dvfs_node[B_CLUSTER]->clk) / 1000;
+ mutex_unlock(&rockchip_bl_balanced_lock);
+
+ /* Kick start the state machine */
+ initial_freq = cpufreq_get(0);
+ if (initial_freq)
+ rockchip_bl_balanced_cpufreq_transition(L_CLUSTER,
+ initial_freq);
+
+ return 0;
+}
+
+static struct cpuquiet_governor rockchip_bl_balanced_governor = {
+ .name = GOVERNOR_NAME,
+ .start = rockchip_bl_balanced_start,
+ .stop = rockchip_bl_balanced_stop,
+ .owner = THIS_MODULE,
+};
+#endif
projects / firefly-linux-kernel-4.4.55.git / blobdiff