diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/cpufreq/acpi-cpufreq.c | 218 | ||||
| -rw-r--r-- | drivers/cpufreq/amd_freq_sensitivity.c | 8 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq-dt.c | 303 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 441 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_conservative.c | 282 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_governor.c | 760 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_governor.h | 261 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 445 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.h | 30 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_performance.c | 18 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_powersave.c | 10 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_userspace.c | 10 | ||||
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 465 | ||||
| -rw-r--r-- | drivers/cpufreq/powernv-cpufreq.c | 222 | ||||
| -rw-r--r-- | drivers/cpufreq/pxa2xx-cpufreq.c | 2 | ||||
| -rw-r--r-- | drivers/cpufreq/s5pv210-cpufreq.c | 2 |
17 files changed, 1703 insertions, 1775 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index f93511031..a7f45853c 100644 --- a/drivers/cpufreq/Kconfig +++ b/drivers/cpufreq/Kconfig @@ -19,6 +19,7 @@ config CPU_FREQ if CPU_FREQ config CPU_FREQ_GOV_COMMON + select IRQ_WORK bool config CPU_FREQ_BOOST_SW diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index 51eef87bb..fb5712141 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -70,6 +70,8 @@ struct acpi_cpufreq_data { unsigned int cpu_feature; unsigned int acpi_perf_cpu; cpumask_var_t freqdomain_cpus; + void (*cpu_freq_write)(struct acpi_pct_register *reg, u32 val); + u32 (*cpu_freq_read)(struct acpi_pct_register *reg); }; /* acpi_perf_data is a pointer to percpu data. */ @@ -243,125 +245,119 @@ static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) } } -struct msr_addr { - u32 reg; -}; +static u32 cpu_freq_read_intel(struct acpi_pct_register *not_used) +{ + u32 val, dummy; -struct io_addr { - u16 port; - u8 bit_width; -}; + rdmsr(MSR_IA32_PERF_CTL, val, dummy); + return val; +} + +static void cpu_freq_write_intel(struct acpi_pct_register *not_used, u32 val) +{ + u32 lo, hi; + + rdmsr(MSR_IA32_PERF_CTL, lo, hi); + lo = (lo & ~INTEL_MSR_RANGE) | (val & INTEL_MSR_RANGE); + wrmsr(MSR_IA32_PERF_CTL, lo, hi); +} + +static u32 cpu_freq_read_amd(struct acpi_pct_register *not_used) +{ + u32 val, dummy; + + rdmsr(MSR_AMD_PERF_CTL, val, dummy); + return val; +} + +static void cpu_freq_write_amd(struct acpi_pct_register *not_used, u32 val) +{ + wrmsr(MSR_AMD_PERF_CTL, val, 0); +} + +static u32 cpu_freq_read_io(struct acpi_pct_register *reg) +{ + u32 val; + + acpi_os_read_port(reg->address, &val, reg->bit_width); + return val; +} + +static void cpu_freq_write_io(struct acpi_pct_register *reg, u32 val) +{ + acpi_os_write_port(reg->address, val, reg->bit_width); +} struct drv_cmd { - unsigned int type; - const struct cpumask *mask; - union { - struct msr_addr msr; - struct io_addr io; - } addr; + struct acpi_pct_register *reg; u32 val; + union { + void (*write)(struct acpi_pct_register *reg, u32 val); + u32 (*read)(struct acpi_pct_register *reg); + } func; }; /* Called via smp_call_function_single(), on the target CPU */ static void do_drv_read(void *_cmd) { struct drv_cmd *cmd = _cmd; - u32 h; - switch (cmd->type) { - case SYSTEM_INTEL_MSR_CAPABLE: - case SYSTEM_AMD_MSR_CAPABLE: - rdmsr(cmd->addr.msr.reg, cmd->val, h); - break; - case SYSTEM_IO_CAPABLE: - acpi_os_read_port((acpi_io_address)cmd->addr.io.port, - &cmd->val, - (u32)cmd->addr.io.bit_width); - break; - default: - break; - } + cmd->val = cmd->func.read(cmd->reg); } -/* Called via smp_call_function_many(), on the target CPUs */ -static void do_drv_write(void *_cmd) +static u32 drv_read(struct acpi_cpufreq_data *data, const struct cpumask *mask) { - struct drv_cmd *cmd = _cmd; - u32 lo, hi; + struct acpi_processor_performance *perf = to_perf_data(data); + struct drv_cmd cmd = { + .reg = &perf->control_register, + .func.read = data->cpu_freq_read, + }; + int err; - switch (cmd->type) { - case SYSTEM_INTEL_MSR_CAPABLE: - rdmsr(cmd->addr.msr.reg, lo, hi); - lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); - wrmsr(cmd->addr.msr.reg, lo, hi); - break; - case SYSTEM_AMD_MSR_CAPABLE: - wrmsr(cmd->addr.msr.reg, cmd->val, 0); - break; - case SYSTEM_IO_CAPABLE: - acpi_os_write_port((acpi_io_address)cmd->addr.io.port, - cmd->val, - (u32)cmd->addr.io.bit_width); - break; - default: - break; - } + err = smp_call_function_any(mask, do_drv_read, &cmd, 1); + WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */ + return cmd.val; } -static void drv_read(struct drv_cmd *cmd) +/* Called via smp_call_function_many(), on the target CPUs */ +static void do_drv_write(void *_cmd) { - int err; - cmd->val = 0; + struct drv_cmd *cmd = _cmd; - err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1); - WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */ + cmd->func.write(cmd->reg, cmd->val); } -static void drv_write(struct drv_cmd *cmd) +static void drv_write(struct acpi_cpufreq_data *data, + const struct cpumask *mask, u32 val) { + struct acpi_processor_performance *perf = to_perf_data(data); + struct drv_cmd cmd = { + .reg = &perf->control_register, + .val = val, + .func.write = data->cpu_freq_write, + }; int this_cpu; this_cpu = get_cpu(); - if (cpumask_test_cpu(this_cpu, cmd->mask)) - do_drv_write(cmd); - smp_call_function_many(cmd->mask, do_drv_write, cmd, 1); + if (cpumask_test_cpu(this_cpu, mask)) + do_drv_write(&cmd); + + smp_call_function_many(mask, do_drv_write, &cmd, 1); put_cpu(); } -static u32 -get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data) +static u32 get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data) { - struct acpi_processor_performance *perf; - struct drv_cmd cmd; + u32 val; if (unlikely(cpumask_empty(mask))) return 0; - switch (data->cpu_feature) { - case SYSTEM_INTEL_MSR_CAPABLE: - cmd.type = SYSTEM_INTEL_MSR_CAPABLE; - cmd.addr.msr.reg = MSR_IA32_PERF_CTL; - break; - case SYSTEM_AMD_MSR_CAPABLE: - cmd.type = SYSTEM_AMD_MSR_CAPABLE; - cmd.addr.msr.reg = MSR_AMD_PERF_CTL; - break; - case SYSTEM_IO_CAPABLE: - cmd.type = SYSTEM_IO_CAPABLE; - perf = to_perf_data(data); - cmd.addr.io.port = perf->control_register.address; - cmd.addr.io.bit_width = perf->control_register.bit_width; - break; - default: - return 0; - } - - cmd.mask = mask; - drv_read(&cmd); + val = drv_read(data, mask); - pr_debug("get_cur_val = %u\n", cmd.val); + pr_debug("get_cur_val = %u\n", val); - return cmd.val; + return val; } static unsigned int get_cur_freq_on_cpu(unsigned int cpu) @@ -416,7 +412,7 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy, { struct acpi_cpufreq_data *data = policy->driver_data; struct acpi_processor_performance *perf; - struct drv_cmd cmd; + const struct cpumask *mask; unsigned int next_perf_state = 0; /* Index into perf table */ int result = 0; @@ -434,42 +430,21 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy, } else { pr_debug("Already at target state (P%d)\n", next_perf_state); - goto out; + return 0; } } - switch (data->cpu_feature) { - case SYSTEM_INTEL_MSR_CAPABLE: - cmd.type = SYSTEM_INTEL_MSR_CAPABLE; - cmd.addr.msr.reg = MSR_IA32_PERF_CTL; - cmd.val = (u32) perf->states[next_perf_state].control; - break; - case SYSTEM_AMD_MSR_CAPABLE: - cmd.type = SYSTEM_AMD_MSR_CAPABLE; - cmd.addr.msr.reg = MSR_AMD_PERF_CTL; - cmd.val = (u32) perf->states[next_perf_state].control; - break; - case SYSTEM_IO_CAPABLE: - cmd.type = SYSTEM_IO_CAPABLE; - cmd.addr.io.port = perf->control_register.address; - cmd.addr.io.bit_width = perf->control_register.bit_width; - cmd.val = (u32) perf->states[next_perf_state].control; - break; - default: - result = -ENODEV; - goto out; - } - - /* cpufreq holds the hotplug lock, so we are safe from here on */ - if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) - cmd.mask = policy->cpus; - else - cmd.mask = cpumask_of(policy->cpu); + /* + * The core won't allow CPUs to go away until the governor has been + * stopped, so we can rely on the stability of policy->cpus. + */ + mask = policy->shared_type == CPUFREQ_SHARED_TYPE_ANY ? + cpumask_of(policy->cpu) : policy->cpus; - drv_write(&cmd); + drv_write(data, mask, perf->states[next_perf_state].control); if (acpi_pstate_strict) { - if (!check_freqs(cmd.mask, data->freq_table[index].frequency, + if (!check_freqs(mask, data->freq_table[index].frequency, data)) { pr_debug("acpi_cpufreq_target failed (%d)\n", policy->cpu); @@ -480,7 +455,6 @@ static int acpi_cpufreq_target(struct cpufreq_policy *policy, if (!result) perf->state = next_perf_state; -out: return result; } @@ -540,8 +514,10 @@ static int boost_notify(struct notifier_block *nb, unsigned long action, */ switch (action) { - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: + case CPU_DOWN_FAILED: + case CPU_DOWN_FAILED_FROZEN: + case CPU_ONLINE: + case CPU_ONLINE_FROZEN: boost_set_msrs(acpi_cpufreq_driver.boost_enabled, cpumask); break; @@ -740,15 +716,21 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) } pr_debug("SYSTEM IO addr space\n"); data->cpu_feature = SYSTEM_IO_CAPABLE; + data->cpu_freq_read = cpu_freq_read_io; + data->cpu_freq_write = cpu_freq_write_io; break; case ACPI_ADR_SPACE_FIXED_HARDWARE: pr_debug("HARDWARE addr space\n"); if (check_est_cpu(cpu)) { data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; + data->cpu_freq_read = cpu_freq_read_intel; + data->cpu_freq_write = cpu_freq_write_intel; break; } if (check_amd_hwpstate_cpu(cpu)) { data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE; + data->cpu_freq_read = cpu_freq_read_amd; + data->cpu_freq_write = cpu_freq_write_amd; break; } result = -ENODEV; diff --git a/drivers/cpufreq/amd_freq_sensitivity.c b/drivers/cpufreq/amd_freq_sensitivity.c index f6b79ab00..404360cad 100644 --- a/drivers/cpufreq/amd_freq_sensitivity.c +++ b/drivers/cpufreq/amd_freq_sensitivity.c @@ -21,7 +21,7 @@ #include <asm/msr.h> #include <asm/cpufeature.h> -#include "cpufreq_governor.h" +#include "cpufreq_ondemand.h" #define MSR_AMD64_FREQ_SENSITIVITY_ACTUAL 0xc0010080 #define MSR_AMD64_FREQ_SENSITIVITY_REFERENCE 0xc0010081 @@ -45,10 +45,10 @@ static unsigned int amd_powersave_bias_target(struct cpufreq_policy *policy, long d_actual, d_reference; struct msr actual, reference; struct cpu_data_t *data = &per_cpu(cpu_data, policy->cpu); - struct dbs_data *od_data = policy->governor_data; + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct dbs_data *od_data = policy_dbs->dbs_data; struct od_dbs_tuners *od_tuners = od_data->tuners; - struct od_cpu_dbs_info_s *od_info = - od_data->cdata->get_cpu_dbs_info_s(policy->cpu); + struct od_policy_dbs_info *od_info = to_dbs_info(policy_dbs); if (!od_info->freq_table) return freq_next; diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c index 0ca74d070..5f8dbe640 100644 --- a/drivers/cpufreq/cpufreq-dt.c +++ b/drivers/cpufreq/cpufreq-dt.c @@ -4,9 +4,6 @@ * Copyright (C) 2014 Linaro. * Viresh Kumar <viresh.kumar@linaro.org> * - * The OPP code in function set_target() is reused from - * drivers/cpufreq/omap-cpufreq.c - * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. @@ -31,9 +28,8 @@ struct private_data { struct device *cpu_dev; - struct regulator *cpu_reg; struct thermal_cooling_device *cdev; - unsigned int voltage_tolerance; /* in percentage */ + const char *reg_name; }; static struct freq_attr *cpufreq_dt_attr[] = { @@ -44,175 +40,128 @@ static struct freq_attr *cpufreq_dt_attr[] = { static int set_target(struct cpufreq_policy *policy, unsigned int index) { - struct dev_pm_opp *opp; - struct cpufreq_frequency_table *freq_table = policy->freq_table; - struct clk *cpu_clk = policy->clk; struct private_data *priv = policy->driver_data; - struct device *cpu_dev = priv->cpu_dev; - struct regulator *cpu_reg = priv->cpu_reg; - unsigned long volt = 0, tol = 0; - int volt_old = 0; - unsigned int old_freq, new_freq; - long freq_Hz, freq_exact; - int ret; - freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000); - if (freq_Hz <= 0) - freq_Hz = freq_table[index].frequency * 1000; - - freq_exact = freq_Hz; - new_freq = freq_Hz / 1000; - old_freq = clk_get_rate(cpu_clk) / 1000; + return dev_pm_opp_set_rate(priv->cpu_dev, + policy->freq_table[index].frequency * 1000); +} - if (!IS_ERR(cpu_reg)) { - unsigned long opp_freq; +/* + * An earlier version of opp-v1 bindings used to name the regulator + * "cpu0-supply", we still need to handle that for backwards compatibility. + */ +static const char *find_supply_name(struct device *dev) +{ + struct device_node *np; + struct property *pp; + int cpu = dev->id; + const char *name = NULL; - rcu_read_lock(); - opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz); - if (IS_ERR(opp)) { - rcu_read_unlock(); - dev_err(cpu_dev, "failed to find OPP for %ld\n", - freq_Hz); - return PTR_ERR(opp); - } - volt = dev_pm_opp_get_voltage(opp); - opp_freq = dev_pm_opp_get_freq(opp); - rcu_read_unlock(); - tol = volt * priv->voltage_tolerance / 100; - volt_old = regulator_get_voltage(cpu_reg); - dev_dbg(cpu_dev, "Found OPP: %ld kHz, %ld uV\n", - opp_freq / 1000, volt); - } + np = of_node_get(dev->of_node); - dev_dbg(cpu_dev, "%u MHz, %d mV --> %u MHz, %ld mV\n", - old_freq / 1000, (volt_old > 0) ? volt_old / 1000 : -1, - new_freq / 1000, volt ? volt / 1000 : -1); + /* This must be valid for sure */ + if (WARN_ON(!np)) + return NULL; - /* scaling up? scale voltage before frequency */ - if (!IS_ERR(cpu_reg) && new_freq > old_freq) { - ret = regulator_set_voltage_tol(cpu_reg, volt, tol); - if (ret) { - dev_err(cpu_dev, "failed to scale voltage up: %d\n", - ret); - return ret; + /* Try "cpu0" for older DTs */ + if (!cpu) { + pp = of_find_property(np, "cpu0-supply", NULL); + if (pp) { + name = "cpu0"; + goto node_put; } } - ret = clk_set_rate(cpu_clk, freq_exact); - if (ret) { - dev_err(cpu_dev, "failed to set clock rate: %d\n", ret); - if (!IS_ERR(cpu_reg) && volt_old > 0) - regulator_set_voltage_tol(cpu_reg, volt_old, tol); - return ret; + pp = of_find_property(np, "cpu-supply", NULL); + if (pp) { + name = "cpu"; + goto node_put; } - /* scaling down? scale voltage after frequency */ - if (!IS_ERR(cpu_reg) && new_freq < old_freq) { - ret = regulator_set_voltage_tol(cpu_reg, volt, tol); - if (ret) { - dev_err(cpu_dev, "failed to scale voltage down: %d\n", - ret); - clk_set_rate(cpu_clk, old_freq * 1000); - } - } - - return ret; + dev_dbg(dev, "no regulator for cpu%d\n", cpu); +node_put: + of_node_put(np); + return name; } -static int allocate_resources(int cpu, struct device **cdev, - struct regulator **creg, struct clk **cclk) +static int resources_available(void) { struct device *cpu_dev; struct regulator *cpu_reg; struct clk *cpu_clk; int ret = 0; - char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg; + const char *name; - cpu_dev = get_cpu_device(cpu); + cpu_dev = get_cpu_device(0); if (!cpu_dev) { - pr_err("failed to get cpu%d device\n", cpu); + pr_err("failed to get cpu0 device\n"); return -ENODEV; } - /* Try "cpu0" for older DTs */ - if (!cpu) - reg = reg_cpu0; - else - reg = reg_cpu; - -try_again: - cpu_reg = regulator_get_optional(cpu_dev, reg); - ret = PTR_ERR_OR_ZERO(cpu_reg); + cpu_clk = clk_get(cpu_dev, NULL); + ret = PTR_ERR_OR_ZERO(cpu_clk); if (ret) { /* - * If cpu's regulator supply node is present, but regulator is - * not yet registered, we should try defering probe. + * If cpu's clk node is present, but clock is not yet + * registered, we should try defering probe. */ - if (ret == -EPROBE_DEFER) { - dev_dbg(cpu_dev, "cpu%d regulator not ready, retry\n", - cpu); - return ret; - } - - /* Try with "cpu-supply" */ - if (reg == reg_cpu0) { - reg = reg_cpu; - goto try_again; - } + if (ret == -EPROBE_DEFER) + dev_dbg(cpu_dev, "clock not ready, retry\n"); + else + dev_err(cpu_dev, "failed to get clock: %d\n", ret); - dev_dbg(cpu_dev, "no regulator for cpu%d: %d\n", cpu, ret); + return ret; } - cpu_clk = clk_get(cpu_dev, NULL); - ret = PTR_ERR_OR_ZERO(cpu_clk); - if (ret) { - /* put regulator */ - if (!IS_ERR(cpu_reg)) - regulator_put(cpu_reg); + clk_put(cpu_clk); + + name = find_supply_name(cpu_dev); + /* Platform doesn't require regulator */ + if (!name) + return 0; + cpu_reg = regulator_get_optional(cpu_dev, name); + ret = PTR_ERR_OR_ZERO(cpu_reg); + if (ret) { /* - * If cpu's clk node is present, but clock is not yet - * registered, we should try defering probe. + * If cpu's regulator supply node is present, but regulator is + * not yet registered, we should try defering probe. */ if (ret == -EPROBE_DEFER) - dev_dbg(cpu_dev, "cpu%d clock not ready, retry\n", cpu); + dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n"); else - dev_err(cpu_dev, "failed to get cpu%d clock: %d\n", cpu, - ret); - } else { - *cdev = cpu_dev; - *creg = cpu_reg; - *cclk = cpu_clk; + dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret); + + return ret; } - return ret; + regulator_put(cpu_reg); + return 0; } static int cpufreq_init(struct cpufreq_policy *policy) { struct cpufreq_frequency_table *freq_table; - struct device_node *np; struct private_data *priv; struct device *cpu_dev; - struct regulator *cpu_reg; struct clk *cpu_clk; struct dev_pm_opp *suspend_opp; - unsigned long min_uV = ~0, max_uV = 0; unsigned int transition_latency; - bool need_update = false; + bool opp_v1 = false; + const char *name; int ret; - ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk); - if (ret) { - pr_err("%s: Failed to allocate resources: %d\n", __func__, ret); - return ret; + cpu_dev = get_cpu_device(policy->cpu); + if (!cpu_dev) { + pr_err("failed to get cpu%d device\n", policy->cpu); + return -ENODEV; } - np = of_node_get(cpu_dev->of_node); - if (!np) { - dev_err(cpu_dev, "failed to find cpu%d node\n", policy->cpu); - ret = -ENOENT; - goto out_put_reg_clk; + cpu_clk = clk_get(cpu_dev, NULL); + if (IS_ERR(cpu_clk)) { + ret = PTR_ERR(cpu_clk); + dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret); + return ret; } /* Get OPP-sharing information from "operating-points-v2" bindings */ @@ -223,9 +172,23 @@ static int cpufreq_init(struct cpufreq_policy *policy) * finding shared-OPPs for backward compatibility. */ if (ret == -ENOENT) - need_update = true; + opp_v1 = true; else - goto out_node_put; + goto out_put_clk; + } + + /* + * OPP layer will be taking care of regulators now, but it needs to know + * the name of the regulator first. + */ + name = find_supply_name(cpu_dev); + if (name) { + ret = dev_pm_opp_set_regulator(cpu_dev, name); + if (ret) { + dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n", + policy->cpu, ret); + goto out_put_clk; + } } /* @@ -246,12 +209,12 @@ static int cpufreq_init(struct cpufreq_policy *policy) */ ret = dev_pm_opp_get_opp_count(cpu_dev); if (ret <= 0) { - pr_debug("OPP table is not ready, deferring probe\n"); + dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n"); ret = -EPROBE_DEFER; goto out_free_opp; } - if (need_update) { + if (opp_v1) { struct cpufreq_dt_platform_data *pd = cpufreq_get_driver_data(); if (!pd || !pd->independent_clocks) @@ -265,10 +228,6 @@ static int cpufreq_init(struct cpufreq_policy *policy) if (ret) dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n", __func__, ret); - - of_property_read_u32(np, "clock-latency", &transition_latency); - } else { - transition_latency = dev_pm_opp_get_max_clock_latency(cpu_dev); } priv = kzalloc(sizeof(*priv), GFP_KERNEL); @@ -277,62 +236,16 @@ static int cpufreq_init(struct cpufreq_policy *policy) goto out_free_opp; } - of_property_read_u32(np, "voltage-tolerance", &priv->voltage_tolerance); - - if (!transition_latency) - transition_latency = CPUFREQ_ETERNAL; - - if (!IS_ERR(cpu_reg)) { - unsigned long opp_freq = 0; - - /* - * Disable any OPPs where the connected regulator isn't able to - * provide the specified voltage and record minimum and maximum - * voltage levels. - */ - while (1) { - struct dev_pm_opp *opp; - unsigned long opp_uV, tol_uV; - - rcu_read_lock(); - opp = dev_pm_opp_find_freq_ceil(cpu_dev, &opp_freq); - if (IS_ERR(opp)) { - rcu_read_unlock(); - break; - } - opp_uV = dev_pm_opp_get_voltage(opp); - rcu_read_unlock(); - - tol_uV = opp_uV * priv->voltage_tolerance / 100; - if (regulator_is_supported_voltage(cpu_reg, - opp_uV - tol_uV, - opp_uV + tol_uV)) { - if (opp_uV < min_uV) - min_uV = opp_uV; - if (opp_uV > max_uV) - max_uV = opp_uV; - } else { - dev_pm_opp_disable(cpu_dev, opp_freq); - } - - opp_freq++; - } - - ret = regulator_set_voltage_time(cpu_reg, min_uV, max_uV); - if (ret > 0) - transition_latency += ret * 1000; - } + priv->reg_name = name; ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); if (ret) { - pr_err("failed to init cpufreq table: %d\n", ret); + dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); goto out_free_priv; } priv->cpu_dev = cpu_dev; - priv->cpu_reg = cpu_reg; policy->driver_data = priv; - policy->clk = cpu_clk; rcu_read_lock(); @@ -357,9 +270,11 @@ static int cpufreq_init(struct cpufreq_policy *policy) cpufreq_dt_attr[1] = &cpufreq_freq_attr_scaling_boost_freqs; } - policy->cpuinfo.transition_latency = transition_latency; + transition_latency = dev_pm_opp_get_max_transition_latency(cpu_dev); + if (!transition_latency) + transition_latency = CPUFREQ_ETERNAL; - of_node_put(np); + policy->cpuinfo.transition_latency = transition_latency; return 0; @@ -369,12 +284,10 @@ out_free_priv: kfree(priv); out_free_opp: dev_pm_opp_of_cpumask_remove_table(policy->cpus); -out_node_put: - of_node_put(np); -out_put_reg_clk: + if (name) + dev_pm_opp_put_regulator(cpu_dev); +out_put_clk: clk_put(cpu_clk); - if (!IS_ERR(cpu_reg)) - regulator_put(cpu_reg); return ret; } @@ -386,9 +299,10 @@ static int cpufreq_exit(struct cpufreq_policy *policy) cpufreq_cooling_unregister(priv->cdev); dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); + if (priv->reg_name) + dev_pm_opp_put_regulator(priv->cpu_dev); + clk_put(policy->clk); - if (!IS_ERR(priv->cpu_reg)) - regulator_put(priv->cpu_reg); kfree(priv); return 0; @@ -441,9 +355,6 @@ static struct cpufreq_driver dt_cpufreq_driver = { static int dt_cpufreq_probe(struct platform_device *pdev) { - struct device *cpu_dev; - struct regulator *cpu_reg; - struct clk *cpu_clk; int ret; /* @@ -453,19 +364,15 @@ static int dt_cpufreq_probe(struct platform_device *pdev) * * FIXME: Is checking this only for CPU0 sufficient ? */ - ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk); + ret = resources_available(); if (ret) return ret; - clk_put(cpu_clk); - if (!IS_ERR(cpu_reg)) - regulator_put(cpu_reg); - dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev); ret = cpufreq_register_driver(&dt_cpufreq_driver); if (ret) - dev_err(cpu_dev, "failed register driver: %d\n", ret); + dev_err(&pdev->dev, "failed register driver: %d\n", ret); return ret; } diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index da8b7b9f4..0a94a2caf 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -39,48 +39,10 @@ static inline bool policy_is_inactive(struct cpufreq_policy *policy) return cpumask_empty(policy->cpus); } -static bool suitable_policy(struct cpufreq_policy *policy, bool active) -{ - return active == !policy_is_inactive(policy); -} - -/* Finds Next Acive/Inactive policy */ -static struct cpufreq_policy *next_policy(struct cpufreq_policy *policy, - bool active) -{ - do { - /* No more policies in the list */ - if (list_is_last(&policy->policy_list, &cpufreq_policy_list)) - return NULL; - - policy = list_next_entry(policy, policy_list); - } while (!suitable_policy(policy, active)); - - return policy; -} - -static struct cpufreq_policy *first_policy(bool active) -{ - struct cpufreq_policy *policy; - - /* No policies in the list */ - if (list_empty(&cpufreq_policy_list)) - return NULL; - - policy = list_first_entry(&cpufreq_policy_list, typeof(*policy), - policy_list); - - if (!suitable_policy(policy, active)) - policy = next_policy(policy, active); - - return policy; -} - /* Macros to iterate over CPU policies */ -#define for_each_suitable_policy(__policy, __active) \ - for (__policy = first_policy(__active); \ - __policy; \ - __policy = next_policy(__policy, __active)) +#define for_each_suitable_policy(__policy, __active) \ + list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) \ + if ((__active) == !policy_is_inactive(__policy)) #define for_each_active_policy(__policy) \ for_each_suitable_policy(__policy, true) @@ -103,7 +65,6 @@ static LIST_HEAD(cpufreq_governor_list); static struct cpufreq_driver *cpufreq_driver; static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data); static DEFINE_RWLOCK(cpufreq_driver_lock); -DEFINE_MUTEX(cpufreq_governor_lock); /* Flag to suspend/resume CPUFreq governors */ static bool cpufreq_suspended; @@ -114,10 +75,9 @@ static inline bool has_target(void) } /* internal prototypes */ -static int __cpufreq_governor(struct cpufreq_policy *policy, - unsigned int event); +static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event); static unsigned int __cpufreq_get(struct cpufreq_policy *policy); -static void handle_update(struct work_struct *work); +static int cpufreq_start_governor(struct cpufreq_policy *policy); /** * Two notifier lists: the "policy" list is involved in the @@ -819,12 +779,7 @@ static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) ssize_t ret; down_read(&policy->rwsem); - - if (fattr->show) - ret = fattr->show(policy, buf); - else - ret = -EIO; - + ret = fattr->show(policy, buf); up_read(&policy->rwsem); return ret; @@ -839,18 +794,12 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr, get_online_cpus(); - if (!cpu_online(policy->cpu)) - goto unlock; - - down_write(&policy->rwsem); - - if (fattr->store) + if (cpu_online(policy->cpu)) { + down_write(&policy->rwsem); ret = fattr->store(policy, buf, count); - else - ret = -EIO; + up_write(&policy->rwsem); + } - up_write(&policy->rwsem); -unlock: put_online_cpus(); return ret; @@ -960,6 +909,11 @@ static int cpufreq_add_dev_interface(struct cpufreq_policy *policy) return cpufreq_add_dev_symlink(policy); } +__weak struct cpufreq_governor *cpufreq_default_governor(void) +{ + return NULL; +} + static int cpufreq_init_policy(struct cpufreq_policy *policy) { struct cpufreq_governor *gov = NULL; @@ -969,11 +923,14 @@ static int cpufreq_init_policy(struct cpufreq_policy *policy) /* Update governor of new_policy to the governor used before hotplug */ gov = find_governor(policy->last_governor); - if (gov) + if (gov) { pr_debug("Restoring governor %s for cpu %d\n", policy->governor->name, policy->cpu); - else - gov = CPUFREQ_DEFAULT_GOVERNOR; + } else { + gov = cpufreq_default_governor(); + if (!gov) + return -ENODATA; + } new_policy.governor = gov; @@ -997,36 +954,42 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cp if (cpumask_test_cpu(cpu, policy->cpus)) return 0; + down_write(&policy->rwsem); if (has_target()) { - ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP); if (ret) { pr_err("%s: Failed to stop governor\n", __func__); - return ret; + goto unlock; } } - down_write(&policy->rwsem); cpumask_set_cpu(cpu, policy->cpus); - up_write(&policy->rwsem); if (has_target()) { - ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); - if (!ret) - ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); - - if (ret) { + ret = cpufreq_start_governor(policy); + if (ret) pr_err("%s: Failed to start governor\n", __func__); - return ret; - } } - return 0; +unlock: + up_write(&policy->rwsem); + return ret; +} + +static void handle_update(struct work_struct *work) +{ + struct cpufreq_policy *policy = + container_of(work, struct cpufreq_policy, update); + unsigned int cpu = policy->cpu; + pr_debug("handle_update for cpu %u called\n", cpu); + cpufreq_update_policy(cpu); } static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) { struct device *dev = get_cpu_device(cpu); struct cpufreq_policy *policy; + int ret; if (WARN_ON(!dev)) return NULL; @@ -1044,7 +1007,13 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) goto err_free_rcpumask; - kobject_init(&policy->kobj, &ktype_cpufreq); + ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, + cpufreq_global_kobject, "policy%u", cpu); + if (ret) { + pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret); + goto err_free_real_cpus; + } + INIT_LIST_HEAD(&policy->policy_list); init_rwsem(&policy->rwsem); spin_lock_init(&policy->transition_lock); @@ -1055,6 +1024,8 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) policy->cpu = cpu; return policy; +err_free_real_cpus: + free_cpumask_var(policy->real_cpus); err_free_rcpumask: free_cpumask_var(policy->related_cpus); err_free_cpumask: @@ -1159,16 +1130,6 @@ static int cpufreq_online(unsigned int cpu) cpumask_copy(policy->related_cpus, policy->cpus); /* Remember CPUs present at the policy creation time. */ cpumask_and(policy->real_cpus, policy->cpus, cpu_present_mask); - - /* Name and add the kobject */ - ret = kobject_add(&policy->kobj, cpufreq_global_kobject, - "policy%u", - cpumask_first(policy->related_cpus)); - if (ret) { - pr_err("%s: failed to add policy->kobj: %d\n", __func__, - ret); - goto out_exit_policy; - } } /* @@ -1310,9 +1271,10 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) return ret; } -static void cpufreq_offline_prepare(unsigned int cpu) +static void cpufreq_offline(unsigned int cpu) { struct cpufreq_policy *policy; + int ret; pr_debug("%s: unregistering CPU %u\n", __func__, cpu); @@ -1322,13 +1284,13 @@ static void cpufreq_offline_prepare(unsigned int cpu) return; } + down_write(&policy->rwsem); if (has_target()) { - int ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP); if (ret) pr_err("%s: Failed to stop governor\n", __func__); } - down_write(&policy->rwsem); cpumask_clear_cpu(cpu, policy->cpus); if (policy_is_inactive(policy)) { @@ -1341,39 +1303,24 @@ static void cpufreq_offline_prepare(unsigned int cpu) /* Nominate new CPU */ policy->cpu = cpumask_any(policy->cpus); } - up_write(&policy->rwsem); /* Start governor again for active policy */ if (!policy_is_inactive(policy)) { if (has_target()) { - int ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); - if (!ret) - ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); - + ret = cpufreq_start_governor(policy); if (ret) pr_err("%s: Failed to start governor\n", __func__); } - } else if (cpufreq_driver->stop_cpu) { - cpufreq_driver->stop_cpu(policy); - } -} -static void cpufreq_offline_finish(unsigned int cpu) -{ - struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); - - if (!policy) { - pr_debug("%s: No cpu_data found\n", __func__); - return; + goto unlock; } - /* Only proceed for inactive policies */ - if (!policy_is_inactive(policy)) - return; + if (cpufreq_driver->stop_cpu) + cpufreq_driver->stop_cpu(policy); /* If cpu is last user of policy, free policy */ if (has_target()) { - int ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); + ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); if (ret) pr_err("%s: Failed to exit governor\n", __func__); } @@ -1387,6 +1334,9 @@ static void cpufreq_offline_finish(unsigned int cpu) cpufreq_driver->exit(policy); policy->freq_table = NULL; } + +unlock: + up_write(&policy->rwsem); } /** @@ -1402,10 +1352,8 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) if (!policy) return; - if (cpu_online(cpu)) { - cpufreq_offline_prepare(cpu); - cpufreq_offline_finish(cpu); - } + if (cpu_online(cpu)) + cpufreq_offline(cpu); cpumask_clear_cpu(cpu, policy->real_cpus); remove_cpu_dev_symlink(policy, cpu); @@ -1414,15 +1362,6 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) cpufreq_policy_free(policy, true); } -static void handle_update(struct work_struct *work) -{ - struct cpufreq_policy *policy = - container_of(work, struct cpufreq_policy, update); - unsigned int cpu = policy->cpu; - pr_debug("handle_update for cpu %u called\n", cpu); - cpufreq_update_policy(cpu); -} - /** * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're * in deep trouble. @@ -1458,9 +1397,17 @@ unsigned int cpufreq_quick_get(unsigned int cpu) { struct cpufreq_policy *policy; unsigned int ret_freq = 0; + unsigned long flags; - if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) - return cpufreq_driver->get(cpu); + read_lock_irqsave(&cpufreq_driver_lock, flags); + + if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) { + ret_freq = cpufreq_driver->get(cpu); + read_unlock_irqrestore(&cpufreq_driver_lock, flags); + return ret_freq; + } + + read_unlock_irqrestore(&cpufreq_driver_lock, flags); policy = cpufreq_cpu_get(cpu); if (policy) { @@ -1541,6 +1488,27 @@ unsigned int cpufreq_get(unsigned int cpu) } EXPORT_SYMBOL(cpufreq_get); +static unsigned int cpufreq_update_current_freq(struct cpufreq_policy *policy) +{ + unsigned int new_freq; + + if (cpufreq_suspended) + return 0; + + new_freq = cpufreq_driver->get(policy->cpu); + if (!new_freq) + return 0; + + if (!policy->cur) { + pr_debug("cpufreq: Driver did not initialize current freq\n"); + policy->cur = new_freq; + } else if (policy->cur != new_freq && has_target()) { + cpufreq_out_of_sync(policy, new_freq); + } + + return new_freq; +} + static struct subsys_interface cpufreq_interface = { .name = "cpufreq", .subsys = &cpu_subsys, @@ -1585,21 +1553,30 @@ EXPORT_SYMBOL(cpufreq_generic_suspend); void cpufreq_suspend(void) { struct cpufreq_policy *policy; + int ret; if (!cpufreq_driver) return; - if (!has_target()) + if (!has_target() && !cpufreq_driver->suspend) goto suspend; pr_debug("%s: Suspending Governors\n", __func__); for_each_active_policy(policy) { - if (__cpufreq_governor(policy, CPUFREQ_GOV_STOP)) - pr_err("%s: Failed to stop governor for policy: %p\n", - __func__, policy); - else if (cpufreq_driver->suspend - && cpufreq_driver->suspend(policy)) + if (has_target()) { + down_write(&policy->rwsem); + ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP); + up_write(&policy->rwsem); + + if (ret) { + pr_err("%s: Failed to stop governor for policy: %p\n", + __func__, policy); + continue; + } + } + + if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy)) pr_err("%s: Failed to suspend driver: %p\n", __func__, policy); } @@ -1617,37 +1594,32 @@ suspend: void cpufreq_resume(void) { struct cpufreq_policy *policy; + int ret; if (!cpufreq_driver) return; cpufreq_suspended = false; - if (!has_target()) + if (!has_target() && !cpufreq_driver->resume) return; pr_debug("%s: Resuming Governors\n", __func__); for_each_active_policy(policy) { - if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) + if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) { pr_err("%s: Failed to resume driver: %p\n", __func__, policy); - else if (__cpufreq_governor(policy, CPUFREQ_GOV_START) - || __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS)) - pr_err("%s: Failed to start governor for policy: %p\n", - __func__, policy); - } + } else if (has_target()) { + down_write(&policy->rwsem); + ret = cpufreq_start_governor(policy); + up_write(&policy->rwsem); - /* - * schedule call cpufreq_update_policy() for first-online CPU, as that - * wouldn't be hotplugged-out on suspend. It will verify that the - * current freq is in sync with what we believe it to be. - */ - policy = cpufreq_cpu_get_raw(cpumask_first(cpu_online_mask)); - if (WARN_ON(!policy)) - return; - - schedule_work(&policy->update); + if (ret) + pr_err("%s: Failed to start governor for policy: %p\n", + __func__, policy); + } + } } /** @@ -1847,14 +1819,18 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, unsigned int relation) { unsigned int old_target_freq = target_freq; - int retval = -EINVAL; + struct cpufreq_frequency_table *freq_table; + int index, retval; if (cpufreq_disabled()) return -ENODEV; /* Make sure that target_freq is within supported range */ - if (target_freq > policy->max) + if (target_freq >= policy->max) { target_freq = policy->max; + cpu_nonscaling(policy->cpu); + } else + cpu_scaling(policy->cpu); if (target_freq < policy->min) target_freq = policy->min; @@ -1874,40 +1850,28 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, policy->restore_freq = policy->cur; if (cpufreq_driver->target) - retval = cpufreq_driver->target(policy, target_freq, relation); - else if (cpufreq_driver->target_index) { - struct cpufreq_frequency_table *freq_table; - int index; - - freq_table = cpufreq_frequency_get_table(policy->cpu); - if (unlikely(!freq_table)) { - pr_err("%s: Unable to find freq_table\n", __func__); - goto out; - } + return cpufreq_driver->target(policy, target_freq, relation); - retval = cpufreq_frequency_table_target(policy, freq_table, - target_freq, relation, &index); - if (unlikely(retval)) { - pr_err("%s: Unable to find matching freq\n", __func__); - goto out; - } - - if (freq_table[index].frequency == policy->cur) { - retval = 0; - goto out; - } + if (!cpufreq_driver->target_index) + return -EINVAL; - retval = __target_index(policy, freq_table, index); + freq_table = cpufreq_frequency_get_table(policy->cpu); + if (unlikely(!freq_table)) { + pr_err("%s: Unable to find freq_table\n", __func__); + return -EINVAL; } -out: - if (likely(retval != -EINVAL)) { - if (target_freq == policy->max) - cpu_nonscaling(policy->cpu); - else - cpu_scaling(policy->cpu); + retval = cpufreq_frequency_table_target(policy, freq_table, target_freq, + relation, &index); + if (unlikely(retval)) { + pr_err("%s: Unable to find matching freq\n", __func__); + return retval; } - return retval; + + if (freq_table[index].frequency == policy->cur) + return 0; + + return __target_index(policy, freq_table, index); } EXPORT_SYMBOL_GPL(__cpufreq_driver_target); @@ -1927,20 +1891,14 @@ int cpufreq_driver_target(struct cpufreq_policy *policy, } EXPORT_SYMBOL_GPL(cpufreq_driver_target); -static int __cpufreq_governor(struct cpufreq_policy *policy, - unsigned int event) +__weak struct cpufreq_governor *cpufreq_fallback_governor(void) { - int ret; + return NULL; +} - /* Only must be defined when default governor is known to have latency - restrictions, like e.g. conservative or ondemand. - That this is the case is already ensured in Kconfig - */ -#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE - struct cpufreq_governor *gov = &cpufreq_gov_performance; -#else - struct cpufreq_governor *gov = NULL; -#endif +static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event) +{ + int ret; /* Don't start any governor operations if we are entering suspend */ if (cpufreq_suspended) @@ -1955,12 +1913,14 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, if (policy->governor->max_transition_latency && policy->cpuinfo.transition_latency > policy->governor->max_transition_latency) { - if (!gov) - return -EINVAL; - else { + struct cpufreq_governor *gov = cpufreq_fallback_governor(); + + if (gov) { pr_warn("%s governor failed, too long transition latency of HW, fallback to %s governor\n", policy->governor->name, gov->name); policy->governor = gov; + } else { + return -EINVAL; } } @@ -1970,21 +1930,6 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, pr_debug("%s: for CPU %u, event %u\n", __func__, policy->cpu, event); - mutex_lock(&cpufreq_governor_lock); - if ((policy->governor_enabled && event == CPUFREQ_GOV_START) - || (!policy->governor_enabled - && (event == CPUFREQ_GOV_LIMITS || event == CPUFREQ_GOV_STOP))) { - mutex_unlock(&cpufreq_governor_lock); - return -EBUSY; - } - - if (event == CPUFREQ_GOV_STOP) - policy->governor_enabled = false; - else if (event == CPUFREQ_GOV_START) - policy->governor_enabled = true; - - mutex_unlock(&cpufreq_governor_lock); - ret = policy->governor->governor(policy, event); if (!ret) { @@ -1992,14 +1937,6 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, policy->governor->initialized++; else if (event == CPUFREQ_GOV_POLICY_EXIT) policy->governor->initialized--; - } else { - /* Restore original values */ - mutex_lock(&cpufreq_governor_lock); - if (event == CPUFREQ_GOV_STOP) - policy->governor_enabled = true; - else if (event == CPUFREQ_GOV_START) - policy->governor_enabled = false; - mutex_unlock(&cpufreq_governor_lock); } if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) || @@ -2009,6 +1946,17 @@ static int __cpufreq_governor(struct cpufreq_policy *policy, return ret; } +static int cpufreq_start_governor(struct cpufreq_policy *policy) +{ + int ret; + + if (cpufreq_driver->get && !cpufreq_driver->setpolicy) + cpufreq_update_current_freq(policy); + + ret = cpufreq_governor(policy, CPUFREQ_GOV_START); + return ret ? ret : cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); +} + int cpufreq_register_governor(struct cpufreq_governor *governor) { int err; @@ -2145,8 +2093,10 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, return cpufreq_driver->setpolicy(new_policy); } - if (new_policy->governor == policy->governor) - goto out; + if (new_policy->governor == policy->governor) { + pr_debug("cpufreq: governor limits update\n"); + return cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + } pr_debug("governor switch\n"); @@ -2154,7 +2104,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, old_gov = policy->governor; /* end old governor */ if (old_gov) { - ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP); if (ret) { /* This can happen due to race with other operations */ pr_debug("%s: Failed to Stop Governor: %s (%d)\n", @@ -2162,10 +2112,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, return ret; } - up_write(&policy->rwsem); - ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); - down_write(&policy->rwsem); - + ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); if (ret) { pr_err("%s: Failed to Exit Governor: %s (%d)\n", __func__, old_gov->name, ret); @@ -2175,32 +2122,27 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, /* start new governor */ policy->governor = new_policy->governor; - ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); + ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); if (!ret) { - ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); - if (!ret) - goto out; - - up_write(&policy->rwsem); - __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); - down_write(&policy->rwsem); + ret = cpufreq_start_governor(policy); + if (!ret) { + pr_debug("cpufreq: governor change\n"); + return 0; + } + cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); } /* new governor failed, so re-start old one */ pr_debug("starting governor %s failed\n", policy->governor->name); if (old_gov) { policy->governor = old_gov; - if (__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) + if (cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) policy->governor = NULL; else - __cpufreq_governor(policy, CPUFREQ_GOV_START); + cpufreq_start_governor(policy); } return ret; - - out: - pr_debug("governor: change or update limits\n"); - return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); } /** @@ -2231,19 +2173,11 @@ int cpufreq_update_policy(unsigned int cpu) * -> ask driver for current freq and notify governors about a change */ if (cpufreq_driver->get && !cpufreq_driver->setpolicy) { - new_policy.cur = cpufreq_driver->get(cpu); + new_policy.cur = cpufreq_update_current_freq(policy); if (WARN_ON(!new_policy.cur)) { ret = -EIO; goto unlock; } - - if (!policy->cur) { - pr_debug("Driver did not initialize current freq\n"); - policy->cur = new_policy.cur; - } else { - if (policy->cur != new_policy.cur && has_target()) - cpufreq_out_of_sync(policy, new_policy.cur); - } } ret = cpufreq_set_policy(policy, &new_policy); @@ -2267,11 +2201,7 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb, break; case CPU_DOWN_PREPARE: - cpufreq_offline_prepare(cpu); - break; - - case CPU_POST_DEAD: - cpufreq_offline_finish(cpu); + cpufreq_offline(cpu); break; case CPU_DOWN_FAILED: @@ -2304,8 +2234,11 @@ static int cpufreq_boost_set_sw(int state) __func__); break; } + + down_write(&policy->rwsem); policy->user_policy.max = policy->max; - __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); + up_write(&policy->rwsem); } } @@ -2391,7 +2324,7 @@ EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); * submitted by the CPU Frequency driver. * * Registers a CPU Frequency driver to this core code. This code - * returns zero on success, -EBUSY when another driver got here first + * returns zero on success, -EEXIST when another driver got here first * (and isn't unregistered in the meantime). * */ diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index ce8a7e14d..3b642c9d0 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -14,6 +14,22 @@ #include <linux/slab.h> #include "cpufreq_governor.h" +struct cs_policy_dbs_info { + struct policy_dbs_info policy_dbs; + unsigned int down_skip; + unsigned int requested_freq; +}; + +static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs) +{ + return container_of(policy_dbs, struct cs_policy_dbs_info, policy_dbs); +} + +struct cs_dbs_tuners { + unsigned int down_threshold; + unsigned int freq_step; +}; + /* Conservative governor macros */ #ifdef CONFIG_SCHED_BFS #define DEF_FREQUENCY_UP_THRESHOLD (63) @@ -27,21 +43,6 @@ #define DEF_SAMPLING_DOWN_FACTOR (1) #define MAX_SAMPLING_DOWN_FACTOR (10) -static DEFINE_PER_CPU(struct cs_cpu_dbs_info_s, cs_cpu_dbs_info); - -static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy, - unsigned int event); - -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE -static -#endif -struct cpufreq_governor cpufreq_gov_conservative = { - .name = "conservative", - .governor = cs_cpufreq_governor_dbs, - .max_transition_latency = TRANSITION_LATENCY_LIMIT, - .owner = THIS_MODULE, -}; - static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners, struct cpufreq_policy *policy) { @@ -63,27 +64,28 @@ static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners, * Any frequency increase takes it to the maximum frequency. Frequency reduction * happens at minimum steps of 5% (default) of maximum frequency */ -static void cs_check_cpu(int cpu, unsigned int load) +static unsigned int cs_dbs_timer(struct cpufreq_policy *policy) { - struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu); - struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy; - struct dbs_data *dbs_data = policy->governor_data; + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); + struct dbs_data *dbs_data = policy_dbs->dbs_data; struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; + unsigned int load = dbs_update(policy); /* * break out if we 'cannot' reduce the speed as the user might * want freq_step to be zero */ if (cs_tuners->freq_step == 0) - return; + goto out; /* Check for frequency increase */ - if (load > cs_tuners->up_threshold) { + if (load > dbs_data->up_threshold) { dbs_info->down_skip = 0; /* if we are already at full speed then break out early */ if (dbs_info->requested_freq == policy->max) - return; + goto out; dbs_info->requested_freq += get_freq_target(cs_tuners, policy); @@ -92,12 +94,12 @@ static void cs_check_cpu(int cpu, unsigned int load) __cpufreq_driver_target(policy, dbs_info->requested_freq, CPUFREQ_RELATION_H); - return; + goto out; } /* if sampling_down_factor is active break out early */ - if (++dbs_info->down_skip < cs_tuners->sampling_down_factor) - return; + if (++dbs_info->down_skip < dbs_data->sampling_down_factor) + goto out; dbs_info->down_skip = 0; /* Check for frequency decrease */ @@ -107,7 +109,7 @@ static void cs_check_cpu(int cpu, unsigned int load) * if we cannot reduce the frequency anymore, break out early */ if (policy->cur == policy->min) - return; + goto out; freq_target = get_freq_target(cs_tuners, policy); if (dbs_info->requested_freq > freq_target) @@ -117,58 +119,25 @@ static void cs_check_cpu(int cpu, unsigned int load) __cpufreq_driver_target(policy, dbs_info->requested_freq, CPUFREQ_RELATION_L); - return; } -} - -static unsigned int cs_dbs_timer(struct cpufreq_policy *policy, bool modify_all) -{ - struct dbs_data *dbs_data = policy->governor_data; - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; - - if (modify_all) - dbs_check_cpu(dbs_data, policy->cpu); - return delay_for_sampling_rate(cs_tuners->sampling_rate); + out: + return dbs_data->sampling_rate; } static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val, - void *data) -{ - struct cpufreq_freqs *freq = data; - struct cs_cpu_dbs_info_s *dbs_info = - &per_cpu(cs_cpu_dbs_info, freq->cpu); - struct cpufreq_policy *policy = cpufreq_cpu_get_raw(freq->cpu); - - if (!policy) - return 0; - - /* policy isn't governed by conservative governor */ - if (policy->governor != &cpufreq_gov_conservative) - return 0; - - /* - * we only care if our internally tracked freq moves outside the 'valid' - * ranges of frequency available to us otherwise we do not change it - */ - if (dbs_info->requested_freq > policy->max - || dbs_info->requested_freq < policy->min) - dbs_info->requested_freq = freq->new; - - return 0; -} + void *data); static struct notifier_block cs_cpufreq_notifier_block = { .notifier_call = dbs_cpufreq_notifier, }; /************************** sysfs interface ************************/ -static struct common_dbs_data cs_dbs_cdata; +static struct dbs_governor cs_dbs_gov; static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, const char *buf, size_t count) { - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; unsigned int input; int ret; ret = sscanf(buf, "%u", &input); @@ -176,22 +145,7 @@ static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) return -EINVAL; - cs_tuners->sampling_down_factor = input; - return count; -} - -static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, - size_t count) -{ - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; - unsigned int input; - int ret; - ret = sscanf(buf, "%u", &input); - - if (ret != 1) - return -EINVAL; - - cs_tuners->sampling_rate = max(input, dbs_data->min_sampling_rate); + dbs_data->sampling_down_factor = input; return count; } @@ -206,7 +160,7 @@ static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, if (ret != 1 || input > 100 || input <= cs_tuners->down_threshold) return -EINVAL; - cs_tuners->up_threshold = input; + dbs_data->up_threshold = input; return count; } @@ -220,7 +174,7 @@ static ssize_t store_down_threshold(struct dbs_data *dbs_data, const char *buf, /* cannot be lower than 11 otherwise freq will not fall */ if (ret != 1 || input < 11 || input > 100 || - input >= cs_tuners->up_threshold) + input >= dbs_data->up_threshold) return -EINVAL; cs_tuners->down_threshold = input; @@ -230,8 +184,7 @@ static ssize_t store_down_threshold(struct dbs_data *dbs_data, const char *buf, static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, const char *buf, size_t count) { - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; - unsigned int input, j; + unsigned int input; int ret; ret = sscanf(buf, "%u", &input); @@ -241,21 +194,14 @@ static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, if (input > 1) input = 1; - if (input == cs_tuners->ignore_nice_load) /* nothing to do */ + if (input == dbs_data->ignore_nice_load) /* nothing to do */ return count; - cs_tuners->ignore_nice_load = input; + dbs_data->ignore_nice_load = input; /* we need to re-evaluate prev_cpu_idle */ - for_each_online_cpu(j) { - struct cs_cpu_dbs_info_s *dbs_info; - dbs_info = &per_cpu(cs_cpu_dbs_info, j); - dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, - &dbs_info->cdbs.prev_cpu_wall, 0); - if (cs_tuners->ignore_nice_load) - dbs_info->cdbs.prev_cpu_nice = - kcpustat_cpu(j).cpustat[CPUTIME_NICE]; - } + gov_update_cpu_data(dbs_data); + return count; } @@ -281,55 +227,47 @@ static ssize_t store_freq_step(struct dbs_data *dbs_data, const char *buf, return count; } -show_store_one(cs, sampling_rate); -show_store_one(cs, sampling_down_factor); -show_store_one(cs, up_threshold); -show_store_one(cs, down_threshold); -show_store_one(cs, ignore_nice_load); -show_store_one(cs, freq_step); -declare_show_sampling_rate_min(cs); - -gov_sys_pol_attr_rw(sampling_rate); -gov_sys_pol_attr_rw(sampling_down_factor); -gov_sys_pol_attr_rw(up_threshold); -gov_sys_pol_attr_rw(down_threshold); -gov_sys_pol_attr_rw(ignore_nice_load); -gov_sys_pol_attr_rw(freq_step); -gov_sys_pol_attr_ro(sampling_rate_min); - -static struct attribute *dbs_attributes_gov_sys[] = { - &sampling_rate_min_gov_sys.attr, - &sampling_rate_gov_sys.attr, - &sampling_down_factor_gov_sys.attr, - &up_threshold_gov_sys.attr, - &down_threshold_gov_sys.attr, - &ignore_nice_load_gov_sys.attr, - &freq_step_gov_sys.attr, +gov_show_one_common(sampling_rate); +gov_show_one_common(sampling_down_factor); +gov_show_one_common(up_threshold); +gov_show_one_common(ignore_nice_load); +gov_show_one_common(min_sampling_rate); +gov_show_one(cs, down_threshold); +gov_show_one(cs, freq_step); + +gov_attr_rw(sampling_rate); +gov_attr_rw(sampling_down_factor); +gov_attr_rw(up_threshold); +gov_attr_rw(ignore_nice_load); +gov_attr_ro(min_sampling_rate); +gov_attr_rw(down_threshold); +gov_attr_rw(freq_step); + +static struct attribute *cs_attributes[] = { + &min_sampling_rate.attr, + &sampling_rate.attr, + &sampling_down_factor.attr, + &up_threshold.attr, + &down_threshold.attr, + &ignore_nice_load.attr, + &freq_step.attr, NULL }; -static struct attribute_group cs_attr_group_gov_sys = { - .attrs = dbs_attributes_gov_sys, - .name = "conservative", -}; +/************************** sysfs end ************************/ -static struct attribute *dbs_attributes_gov_pol[] = { - &sampling_rate_min_gov_pol.attr, - &sampling_rate_gov_pol.attr, - &sampling_down_factor_gov_pol.attr, - &up_threshold_gov_pol.attr, - &down_threshold_gov_pol.attr, - &ignore_nice_load_gov_pol.attr, - &freq_step_gov_pol.attr, - NULL -}; +static struct policy_dbs_info *cs_alloc(void) +{ + struct cs_policy_dbs_info *dbs_info; -static struct attribute_group cs_attr_group_gov_pol = { - .attrs = dbs_attributes_gov_pol, - .name = "conservative", -}; + dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); + return dbs_info ? &dbs_info->policy_dbs : NULL; +} -/************************** sysfs end ************************/ +static void cs_free(struct policy_dbs_info *policy_dbs) +{ + kfree(to_dbs_info(policy_dbs)); +} static int cs_init(struct dbs_data *dbs_data, bool notify) { @@ -341,11 +279,11 @@ static int cs_init(struct dbs_data *dbs_data, bool notify) return -ENOMEM; } - tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; tuners->down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD; - tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; - tuners->ignore_nice_load = 0; tuners->freq_step = DEF_FREQUENCY_STEP; + dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; + dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; + dbs_data->ignore_nice_load = 0; dbs_data->tuners = tuners; dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * @@ -367,35 +305,66 @@ static void cs_exit(struct dbs_data *dbs_data, bool notify) kfree(dbs_data->tuners); } -define_get_cpu_dbs_routines(cs_cpu_dbs_info); +static void cs_start(struct cpufreq_policy *policy) +{ + struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); + + dbs_info->down_skip = 0; + dbs_info->requested_freq = policy->cur; +} -static struct common_dbs_data cs_dbs_cdata = { - .governor = GOV_CONSERVATIVE, - .attr_group_gov_sys = &cs_attr_group_gov_sys, - .attr_group_gov_pol = &cs_attr_group_gov_pol, - .get_cpu_cdbs = get_cpu_cdbs, - .get_cpu_dbs_info_s = get_cpu_dbs_info_s, +static struct dbs_governor cs_dbs_gov = { + .gov = { + .name = "conservative", + .governor = cpufreq_governor_dbs, + .max_transition_latency = TRANSITION_LATENCY_LIMIT, + .owner = THIS_MODULE, + }, + .kobj_type = { .default_attrs = cs_attributes }, .gov_dbs_timer = cs_dbs_timer, - .gov_check_cpu = cs_check_cpu, + .alloc = cs_alloc, + .free = cs_free, .init = cs_init, .exit = cs_exit, - .mutex = __MUTEX_INITIALIZER(cs_dbs_cdata.mutex), + .start = cs_start, }; -static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy, - unsigned int event) +#define CPU_FREQ_GOV_CONSERVATIVE (&cs_dbs_gov.gov) + +static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val, + void *data) { - return cpufreq_governor_dbs(policy, &cs_dbs_cdata, event); + struct cpufreq_freqs *freq = data; + struct cpufreq_policy *policy = cpufreq_cpu_get_raw(freq->cpu); + struct cs_policy_dbs_info *dbs_info; + + if (!policy) + return 0; + + /* policy isn't governed by conservative governor */ + if (policy->governor != CPU_FREQ_GOV_CONSERVATIVE) + return 0; + + dbs_info = to_dbs_info(policy->governor_data); + /* + * we only care if our internally tracked freq moves outside the 'valid' + * ranges of frequency available to us otherwise we do not change it + */ + if (dbs_info->requested_freq > policy->max + || dbs_info->requested_freq < policy->min) + dbs_info->requested_freq = freq->new; + + return 0; } static int __init cpufreq_gov_dbs_init(void) { - return cpufreq_register_governor(&cpufreq_gov_conservative); + return cpufreq_register_governor(CPU_FREQ_GOV_CONSERVATIVE); } static void __exit cpufreq_gov_dbs_exit(void) { - cpufreq_unregister_governor(&cpufreq_gov_conservative); + cpufreq_unregister_governor(CPU_FREQ_GOV_CONSERVATIVE); } MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>"); @@ -405,6 +374,11 @@ MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for " MODULE_LICENSE("GPL"); #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE +struct cpufreq_governor *cpufreq_default_governor(void) +{ + return CPU_FREQ_GOV_CONSERVATIVE; +} + fs_initcall(cpufreq_gov_dbs_init); #else module_init(cpufreq_gov_dbs_init); diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index e0d111024..5f1147fa9 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -18,95 +18,189 @@ #include <linux/export.h> #include <linux/kernel_stat.h> +#include <linux/sched.h> #include <linux/slab.h> #include "cpufreq_governor.h" -static struct attribute_group *get_sysfs_attr(struct dbs_data *dbs_data) -{ - if (have_governor_per_policy()) - return dbs_data->cdata->attr_group_gov_pol; - else - return dbs_data->cdata->attr_group_gov_sys; -} +static DEFINE_PER_CPU(struct cpu_dbs_info, cpu_dbs); + +static DEFINE_MUTEX(gov_dbs_data_mutex); -void dbs_check_cpu(struct dbs_data *dbs_data, int cpu) +/* Common sysfs tunables */ +/** + * store_sampling_rate - update sampling rate effective immediately if needed. + * + * If new rate is smaller than the old, simply updating + * dbs.sampling_rate might not be appropriate. For example, if the + * original sampling_rate was 1 second and the requested new sampling rate is 10 + * ms because the user needs immediate reaction from ondemand governor, but not + * sure if higher frequency will be required or not, then, the governor may + * change the sampling rate too late; up to 1 second later. Thus, if we are + * reducing the sampling rate, we need to make the new value effective + * immediately. + * + * This must be called with dbs_data->mutex held, otherwise traversing + * policy_dbs_list isn't safe. + */ +ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, + size_t count) { - struct cpu_dbs_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu); - struct od_dbs_tuners *od_tuners = dbs_data->tuners; - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; - struct cpufreq_policy *policy = cdbs->shared->policy; - unsigned int sampling_rate; - unsigned int max_load = 0; - unsigned int ignore_nice; - unsigned int j; + struct policy_dbs_info *policy_dbs; + unsigned int rate; + int ret; + ret = sscanf(buf, "%u", &rate); + if (ret != 1) + return -EINVAL; - if (dbs_data->cdata->governor == GOV_ONDEMAND) { - struct od_cpu_dbs_info_s *od_dbs_info = - dbs_data->cdata->get_cpu_dbs_info_s(cpu); + dbs_data->sampling_rate = max(rate, dbs_data->min_sampling_rate); + /* + * We are operating under dbs_data->mutex and so the list and its + * entries can't be freed concurrently. + */ + list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) { + mutex_lock(&policy_dbs->timer_mutex); /* - * Sometimes, the ondemand governor uses an additional - * multiplier to give long delays. So apply this multiplier to - * the 'sampling_rate', so as to keep the wake-up-from-idle - * detection logic a bit conservative. + * On 32-bit architectures this may race with the + * sample_delay_ns read in dbs_update_util_handler(), but that + * really doesn't matter. If the read returns a value that's + * too big, the sample will be skipped, but the next invocation + * of dbs_update_util_handler() (when the update has been + * completed) will take a sample. + * + * If this runs in parallel with dbs_work_handler(), we may end + * up overwriting the sample_delay_ns value that it has just + * written, but it will be corrected next time a sample is + * taken, so it shouldn't be significant. */ - sampling_rate = od_tuners->sampling_rate; - sampling_rate *= od_dbs_info->rate_mult; + gov_update_sample_delay(policy_dbs, 0); + mutex_unlock(&policy_dbs->timer_mutex); + } - ignore_nice = od_tuners->ignore_nice_load; - } else { - sampling_rate = cs_tuners->sampling_rate; - ignore_nice = cs_tuners->ignore_nice_load; + return count; +} +EXPORT_SYMBOL_GPL(store_sampling_rate); + +/** + * gov_update_cpu_data - Update CPU load data. + * @dbs_data: Top-level governor data pointer. + * + * Update CPU load data for all CPUs in the domain governed by @dbs_data + * (that may be a single policy or a bunch of them if governor tunables are + * system-wide). + * + * Call under the @dbs_data mutex. + */ +void gov_update_cpu_data(struct dbs_data *dbs_data) +{ + struct policy_dbs_info *policy_dbs; + + list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) { + unsigned int j; + + for_each_cpu(j, policy_dbs->policy->cpus) { + struct cpu_dbs_info *j_cdbs = &per_cpu(cpu_dbs, j); + + j_cdbs->prev_cpu_idle = get_cpu_idle_time(j, &j_cdbs->prev_cpu_wall, + dbs_data->io_is_busy); + if (dbs_data->ignore_nice_load) + j_cdbs->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE]; + } } +} +EXPORT_SYMBOL_GPL(gov_update_cpu_data); + +static inline struct dbs_data *to_dbs_data(struct kobject *kobj) +{ + return container_of(kobj, struct dbs_data, kobj); +} + +static inline struct governor_attr *to_gov_attr(struct attribute *attr) +{ + return container_of(attr, struct governor_attr, attr); +} + +static ssize_t governor_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct dbs_data *dbs_data = to_dbs_data(kobj); + struct governor_attr *gattr = to_gov_attr(attr); + + return gattr->show(dbs_data, buf); +} + +static ssize_t governor_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct dbs_data *dbs_data = to_dbs_data(kobj); + struct governor_attr *gattr = to_gov_attr(attr); + int ret = -EBUSY; + + mutex_lock(&dbs_data->mutex); + + if (dbs_data->usage_count) + ret = gattr->store(dbs_data, buf, count); + + mutex_unlock(&dbs_data->mutex); + + return ret; +} + +/* + * Sysfs Ops for accessing governor attributes. + * + * All show/store invocations for governor specific sysfs attributes, will first + * call the below show/store callbacks and the attribute specific callback will + * be called from within it. + */ +static const struct sysfs_ops governor_sysfs_ops = { + .show = governor_show, + .store = governor_store, +}; + +unsigned int dbs_update(struct cpufreq_policy *policy) +{ + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct dbs_data *dbs_data = policy_dbs->dbs_data; + unsigned int ignore_nice = dbs_data->ignore_nice_load; + unsigned int max_load = 0; + unsigned int sampling_rate, io_busy, j; + + /* + * Sometimes governors may use an additional multiplier to increase + * sample delays temporarily. Apply that multiplier to sampling_rate + * so as to keep the wake-up-from-idle detection logic a bit + * conservative. + */ + sampling_rate = dbs_data->sampling_rate * policy_dbs->rate_mult; + /* + * For the purpose of ondemand, waiting for disk IO is an indication + * that you're performance critical, and not that the system is actually + * idle, so do not add the iowait time to the CPU idle time then. + */ + io_busy = dbs_data->io_is_busy; /* Get Absolute Load */ for_each_cpu(j, policy->cpus) { - struct cpu_dbs_info *j_cdbs; + struct cpu_dbs_info *j_cdbs = &per_cpu(cpu_dbs, j); u64 cur_wall_time, cur_idle_time; unsigned int idle_time, wall_time; unsigned int load; - int io_busy = 0; - j_cdbs = dbs_data->cdata->get_cpu_cdbs(j); - - /* - * For the purpose of ondemand, waiting for disk IO is - * an indication that you're performance critical, and - * not that the system is actually idle. So do not add - * the iowait time to the cpu idle time. - */ - if (dbs_data->cdata->governor == GOV_ONDEMAND) - io_busy = od_tuners->io_is_busy; cur_idle_time = get_cpu_idle_time(j, &cur_wall_time, io_busy); - wall_time = (unsigned int) - (cur_wall_time - j_cdbs->prev_cpu_wall); + wall_time = cur_wall_time - j_cdbs->prev_cpu_wall; j_cdbs->prev_cpu_wall = cur_wall_time; - if (cur_idle_time < j_cdbs->prev_cpu_idle) - cur_idle_time = j_cdbs->prev_cpu_idle; - - idle_time = (unsigned int) - (cur_idle_time - j_cdbs->prev_cpu_idle); + idle_time = cur_idle_time - j_cdbs->prev_cpu_idle; j_cdbs->prev_cpu_idle = cur_idle_time; if (ignore_nice) { - u64 cur_nice; - unsigned long cur_nice_jiffies; - - cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] - - cdbs->prev_cpu_nice; - /* - * Assumption: nice time between sampling periods will - * be less than 2^32 jiffies for 32 bit sys - */ - cur_nice_jiffies = (unsigned long) - cputime64_to_jiffies64(cur_nice); + u64 cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE]; - cdbs->prev_cpu_nice = - kcpustat_cpu(j).cpustat[CPUTIME_NICE]; - idle_time += jiffies_to_usecs(cur_nice_jiffies); + idle_time += cputime_to_usecs(cur_nice - j_cdbs->prev_cpu_nice); + j_cdbs->prev_cpu_nice = cur_nice; } if (unlikely(!wall_time || wall_time < idle_time)) @@ -128,10 +222,10 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu) * dropped down. So we perform the copy only once, upon the * first wake-up from idle.) * - * Detecting this situation is easy: the governor's deferrable - * timer would not have fired during CPU-idle periods. Hence - * an unusually large 'wall_time' (as compared to the sampling - * rate) indicates this scenario. + * Detecting this situation is easy: the governor's utilization + * update handler would not have run during CPU-idle periods. + * Hence, an unusually large 'wall_time' (as compared to the + * sampling rate) indicates this scenario. * * prev_load can be zero in two cases and we must recalculate it * for both cases: @@ -156,222 +250,224 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu) if (load > max_load) max_load = load; } - - dbs_data->cdata->gov_check_cpu(cpu, max_load); + return max_load; } -EXPORT_SYMBOL_GPL(dbs_check_cpu); +EXPORT_SYMBOL_GPL(dbs_update); -void gov_add_timers(struct cpufreq_policy *policy, unsigned int delay) +static void gov_set_update_util(struct policy_dbs_info *policy_dbs, + unsigned int delay_us) { - struct dbs_data *dbs_data = policy->governor_data; - struct cpu_dbs_info *cdbs; + struct cpufreq_policy *policy = policy_dbs->policy; int cpu; + gov_update_sample_delay(policy_dbs, delay_us); + policy_dbs->last_sample_time = 0; + for_each_cpu(cpu, policy->cpus) { - cdbs = dbs_data->cdata->get_cpu_cdbs(cpu); - cdbs->timer.expires = jiffies + delay; - add_timer_on(&cdbs->timer, cpu); + struct cpu_dbs_info *cdbs = &per_cpu(cpu_dbs, cpu); + + cpufreq_set_update_util_data(cpu, &cdbs->update_util); } } -EXPORT_SYMBOL_GPL(gov_add_timers); -static inline void gov_cancel_timers(struct cpufreq_policy *policy) +static inline void gov_clear_update_util(struct cpufreq_policy *policy) { - struct dbs_data *dbs_data = policy->governor_data; - struct cpu_dbs_info *cdbs; int i; - for_each_cpu(i, policy->cpus) { - cdbs = dbs_data->cdata->get_cpu_cdbs(i); - del_timer_sync(&cdbs->timer); - } -} + for_each_cpu(i, policy->cpus) + cpufreq_set_update_util_data(i, NULL); -void gov_cancel_work(struct cpu_common_dbs_info *shared) -{ - /* Tell dbs_timer_handler() to skip queuing up work items. */ - atomic_inc(&shared->skip_work); - /* - * If dbs_timer_handler() is already running, it may not notice the - * incremented skip_work, so wait for it to complete to prevent its work - * item from being queued up after the cancel_work_sync() below. - */ - gov_cancel_timers(shared->policy); - /* - * In case dbs_timer_handler() managed to run and spawn a work item - * before the timers have been canceled, wait for that work item to - * complete and then cancel all of the timers set up by it. If - * dbs_timer_handler() runs again at that point, it will see the - * positive value of skip_work and won't spawn any more work items. - */ - cancel_work_sync(&shared->work); - gov_cancel_timers(shared->policy); - atomic_set(&shared->skip_work, 0); + synchronize_sched(); } -EXPORT_SYMBOL_GPL(gov_cancel_work); -/* Will return if we need to evaluate cpu load again or not */ -static bool need_load_eval(struct cpu_common_dbs_info *shared, - unsigned int sampling_rate) +static void gov_cancel_work(struct cpufreq_policy *policy) { - if (policy_is_shared(shared->policy)) { - ktime_t time_now = ktime_get(); - s64 delta_us = ktime_us_delta(time_now, shared->time_stamp); - - /* Do nothing if we recently have sampled */ - if (delta_us < (s64)(sampling_rate / 2)) - return false; - else - shared->time_stamp = time_now; - } + struct policy_dbs_info *policy_dbs = policy->governor_data; - return true; + gov_clear_update_util(policy_dbs->policy); + irq_work_sync(&policy_dbs->irq_work); + cancel_work_sync(&policy_dbs->work); + atomic_set(&policy_dbs->work_count, 0); + policy_dbs->work_in_progress = false; } static void dbs_work_handler(struct work_struct *work) { - struct cpu_common_dbs_info *shared = container_of(work, struct - cpu_common_dbs_info, work); + struct policy_dbs_info *policy_dbs; struct cpufreq_policy *policy; - struct dbs_data *dbs_data; - unsigned int sampling_rate, delay; - bool eval_load; - - policy = shared->policy; - dbs_data = policy->governor_data; - - /* Kill all timers */ - gov_cancel_timers(policy); + struct dbs_governor *gov; - if (dbs_data->cdata->governor == GOV_CONSERVATIVE) { - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; + policy_dbs = container_of(work, struct policy_dbs_info, work); + policy = policy_dbs->policy; + gov = dbs_governor_of(policy); - sampling_rate = cs_tuners->sampling_rate; - } else { - struct od_dbs_tuners *od_tuners = dbs_data->tuners; - - sampling_rate = od_tuners->sampling_rate; - } - - eval_load = need_load_eval(shared, sampling_rate); + /* + * Make sure cpufreq_governor_limits() isn't evaluating load or the + * ondemand governor isn't updating the sampling rate in parallel. + */ + mutex_lock(&policy_dbs->timer_mutex); + gov_update_sample_delay(policy_dbs, gov->gov_dbs_timer(policy)); + mutex_unlock(&policy_dbs->timer_mutex); + /* Allow the utilization update handler to queue up more work. */ + atomic_set(&policy_dbs->work_count, 0); /* - * Make sure cpufreq_governor_limits() isn't evaluating load in - * parallel. + * If the update below is reordered with respect to the sample delay + * modification, the utilization update handler may end up using a stale + * sample delay value. */ - mutex_lock(&shared->timer_mutex); - delay = dbs_data->cdata->gov_dbs_timer(policy, eval_load); - mutex_unlock(&shared->timer_mutex); + smp_wmb(); + policy_dbs->work_in_progress = false; +} - atomic_dec(&shared->skip_work); +static void dbs_irq_work(struct irq_work *irq_work) +{ + struct policy_dbs_info *policy_dbs; - gov_add_timers(policy, delay); + policy_dbs = container_of(irq_work, struct policy_dbs_info, irq_work); + schedule_work_on(smp_processor_id(), &policy_dbs->work); } -static void dbs_timer_handler(unsigned long data) +static void dbs_update_util_handler(struct update_util_data *data, u64 time, + unsigned long util, unsigned long max) { - struct cpu_dbs_info *cdbs = (struct cpu_dbs_info *)data; - struct cpu_common_dbs_info *shared = cdbs->shared; + struct cpu_dbs_info *cdbs = container_of(data, struct cpu_dbs_info, update_util); + struct policy_dbs_info *policy_dbs = cdbs->policy_dbs; + u64 delta_ns, lst; /* - * Timer handler may not be allowed to queue the work at the moment, - * because: - * - Another timer handler has done that - * - We are stopping the governor - * - Or we are updating the sampling rate of the ondemand governor + * The work may not be allowed to be queued up right now. + * Possible reasons: + * - Work has already been queued up or is in progress. + * - It is too early (too little time from the previous sample). */ - if (atomic_inc_return(&shared->skip_work) > 1) - atomic_dec(&shared->skip_work); - else - queue_work(system_wq, &shared->work); -} + if (policy_dbs->work_in_progress) + return; -static void set_sampling_rate(struct dbs_data *dbs_data, - unsigned int sampling_rate) -{ - if (dbs_data->cdata->governor == GOV_CONSERVATIVE) { - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; - cs_tuners->sampling_rate = sampling_rate; - } else { - struct od_dbs_tuners *od_tuners = dbs_data->tuners; - od_tuners->sampling_rate = sampling_rate; + /* + * If the reads below are reordered before the check above, the value + * of sample_delay_ns used in the computation may be stale. + */ + smp_rmb(); + lst = READ_ONCE(policy_dbs->last_sample_time); + delta_ns = time - lst; + if ((s64)delta_ns < policy_dbs->sample_delay_ns) + return; + + /* + * If the policy is not shared, the irq_work may be queued up right away + * at this point. Otherwise, we need to ensure that only one of the + * CPUs sharing the policy will do that. + */ + if (policy_dbs->is_shared) { + if (!atomic_add_unless(&policy_dbs->work_count, 1, 1)) + return; + + /* + * If another CPU updated last_sample_time in the meantime, we + * shouldn't be here, so clear the work counter and bail out. + */ + if (unlikely(lst != READ_ONCE(policy_dbs->last_sample_time))) { + atomic_set(&policy_dbs->work_count, 0); + return; + } } + + policy_dbs->last_sample_time = time; + policy_dbs->work_in_progress = true; + irq_work_queue(&policy_dbs->irq_work); } -static int alloc_common_dbs_info(struct cpufreq_policy *policy, - struct common_dbs_data *cdata) +static struct policy_dbs_info *alloc_policy_dbs_info(struct cpufreq_policy *policy, + struct dbs_governor *gov) { - struct cpu_common_dbs_info *shared; + struct policy_dbs_info *policy_dbs; int j; - /* Allocate memory for the common information for policy->cpus */ - shared = kzalloc(sizeof(*shared), GFP_KERNEL); - if (!shared) - return -ENOMEM; + /* Allocate memory for per-policy governor data. */ + policy_dbs = gov->alloc(); + if (!policy_dbs) + return NULL; - /* Set shared for all CPUs, online+offline */ - for_each_cpu(j, policy->related_cpus) - cdata->get_cpu_cdbs(j)->shared = shared; + policy_dbs->policy = policy; + mutex_init(&policy_dbs->timer_mutex); + atomic_set(&policy_dbs->work_count, 0); + init_irq_work(&policy_dbs->irq_work, dbs_irq_work); + INIT_WORK(&policy_dbs->work, dbs_work_handler); - mutex_init(&shared->timer_mutex); - atomic_set(&shared->skip_work, 0); - INIT_WORK(&shared->work, dbs_work_handler); - return 0; + /* Set policy_dbs for all CPUs, online+offline */ + for_each_cpu(j, policy->related_cpus) { + struct cpu_dbs_info *j_cdbs = &per_cpu(cpu_dbs, j); + + j_cdbs->policy_dbs = policy_dbs; + j_cdbs->update_util.func = dbs_update_util_handler; + } + return policy_dbs; } -static void free_common_dbs_info(struct cpufreq_policy *policy, - struct common_dbs_data *cdata) +static void free_policy_dbs_info(struct policy_dbs_info *policy_dbs, + struct dbs_governor *gov) { - struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(policy->cpu); - struct cpu_common_dbs_info *shared = cdbs->shared; int j; - mutex_destroy(&shared->timer_mutex); + mutex_destroy(&policy_dbs->timer_mutex); - for_each_cpu(j, policy->cpus) - cdata->get_cpu_cdbs(j)->shared = NULL; + for_each_cpu(j, policy_dbs->policy->related_cpus) { + struct cpu_dbs_info *j_cdbs = &per_cpu(cpu_dbs, j); - kfree(shared); + j_cdbs->policy_dbs = NULL; + j_cdbs->update_util.func = NULL; + } + gov->free(policy_dbs); } -static int cpufreq_governor_init(struct cpufreq_policy *policy, - struct dbs_data *dbs_data, - struct common_dbs_data *cdata) +static int cpufreq_governor_init(struct cpufreq_policy *policy) { + struct dbs_governor *gov = dbs_governor_of(policy); + struct dbs_data *dbs_data; + struct policy_dbs_info *policy_dbs; unsigned int latency; - int ret; + int ret = 0; /* State should be equivalent to EXIT */ if (policy->governor_data) return -EBUSY; - if (dbs_data) { - if (WARN_ON(have_governor_per_policy())) - return -EINVAL; + policy_dbs = alloc_policy_dbs_info(policy, gov); + if (!policy_dbs) + return -ENOMEM; - ret = alloc_common_dbs_info(policy, cdata); - if (ret) - return ret; + /* Protect gov->gdbs_data against concurrent updates. */ + mutex_lock(&gov_dbs_data_mutex); + dbs_data = gov->gdbs_data; + if (dbs_data) { + if (WARN_ON(have_governor_per_policy())) { + ret = -EINVAL; + goto free_policy_dbs_info; + } + policy_dbs->dbs_data = dbs_data; + policy->governor_data = policy_dbs; + + mutex_lock(&dbs_data->mutex); dbs_data->usage_count++; - policy->governor_data = dbs_data; - return 0; + list_add(&policy_dbs->list, &dbs_data->policy_dbs_list); + mutex_unlock(&dbs_data->mutex); + goto out; } dbs_data = kzalloc(sizeof(*dbs_data), GFP_KERNEL); - if (!dbs_data) - return -ENOMEM; - - ret = alloc_common_dbs_info(policy, cdata); - if (ret) - goto free_dbs_data; + if (!dbs_data) { + ret = -ENOMEM; + goto free_policy_dbs_info; + } - dbs_data->cdata = cdata; - dbs_data->usage_count = 1; + INIT_LIST_HEAD(&dbs_data->policy_dbs_list); + mutex_init(&dbs_data->mutex); - ret = cdata->init(dbs_data, !policy->governor->initialized); + ret = gov->init(dbs_data, !policy->governor->initialized); if (ret) - goto free_common_dbs_info; + goto free_policy_dbs_info; /* policy latency is in ns. Convert it to us first */ latency = policy->cpuinfo.transition_latency / 1000; @@ -381,216 +477,156 @@ static int cpufreq_governor_init(struct cpufreq_policy *policy, /* Bring kernel and HW constraints together */ dbs_data->min_sampling_rate = max(dbs_data->min_sampling_rate, MIN_LATENCY_MULTIPLIER * latency); - set_sampling_rate(dbs_data, max(dbs_data->min_sampling_rate, - latency * LATENCY_MULTIPLIER)); + dbs_data->sampling_rate = max(dbs_data->min_sampling_rate, + LATENCY_MULTIPLIER * latency); if (!have_governor_per_policy()) - cdata->gdbs_data = dbs_data; + gov->gdbs_data = dbs_data; - policy->governor_data = dbs_data; + policy->governor_data = policy_dbs; - ret = sysfs_create_group(get_governor_parent_kobj(policy), - get_sysfs_attr(dbs_data)); - if (ret) - goto reset_gdbs_data; + policy_dbs->dbs_data = dbs_data; + dbs_data->usage_count = 1; + list_add(&policy_dbs->list, &dbs_data->policy_dbs_list); - return 0; + gov->kobj_type.sysfs_ops = &governor_sysfs_ops; + ret = kobject_init_and_add(&dbs_data->kobj, &gov->kobj_type, + get_governor_parent_kobj(policy), + "%s", gov->gov.name); + if (!ret) + goto out; + + /* Failure, so roll back. */ + pr_err("cpufreq: Governor initialization failed (dbs_data kobject init error %d)\n", ret); -reset_gdbs_data: policy->governor_data = NULL; if (!have_governor_per_policy()) - cdata->gdbs_data = NULL; - cdata->exit(dbs_data, !policy->governor->initialized); -free_common_dbs_info: - free_common_dbs_info(policy, cdata); -free_dbs_data: + gov->gdbs_data = NULL; + gov->exit(dbs_data, !policy->governor->initialized); kfree(dbs_data); + +free_policy_dbs_info: + free_policy_dbs_info(policy_dbs, gov); + +out: + mutex_unlock(&gov_dbs_data_mutex); return ret; } -static int cpufreq_governor_exit(struct cpufreq_policy *policy, - struct dbs_data *dbs_data) +static int cpufreq_governor_exit(struct cpufreq_policy *policy) { - struct common_dbs_data *cdata = dbs_data->cdata; - struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(policy->cpu); + struct dbs_governor *gov = dbs_governor_of(policy); + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct dbs_data *dbs_data = policy_dbs->dbs_data; + int count; - /* State should be equivalent to INIT */ - if (!cdbs->shared || cdbs->shared->policy) - return -EBUSY; + /* Protect gov->gdbs_data against concurrent updates. */ + mutex_lock(&gov_dbs_data_mutex); + + mutex_lock(&dbs_data->mutex); + list_del(&policy_dbs->list); + count = --dbs_data->usage_count; + mutex_unlock(&dbs_data->mutex); - if (!--dbs_data->usage_count) { - sysfs_remove_group(get_governor_parent_kobj(policy), - get_sysfs_attr(dbs_data)); + if (!count) { + kobject_put(&dbs_data->kobj); policy->governor_data = NULL; if (!have_governor_per_policy()) - cdata->gdbs_data = NULL; + gov->gdbs_data = NULL; - cdata->exit(dbs_data, policy->governor->initialized == 1); + gov->exit(dbs_data, policy->governor->initialized == 1); + mutex_destroy(&dbs_data->mutex); kfree(dbs_data); } else { policy->governor_data = NULL; } - free_common_dbs_info(policy, cdata); + free_policy_dbs_info(policy_dbs, gov); + + mutex_unlock(&gov_dbs_data_mutex); return 0; } -static int cpufreq_governor_start(struct cpufreq_policy *policy, - struct dbs_data *dbs_data) +static int cpufreq_governor_start(struct cpufreq_policy *policy) { - struct common_dbs_data *cdata = dbs_data->cdata; - unsigned int sampling_rate, ignore_nice, j, cpu = policy->cpu; - struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu); - struct cpu_common_dbs_info *shared = cdbs->shared; - int io_busy = 0; + struct dbs_governor *gov = dbs_governor_of(policy); + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct dbs_data *dbs_data = policy_dbs->dbs_data; + unsigned int sampling_rate, ignore_nice, j; + unsigned int io_busy; if (!policy->cur) return -EINVAL; - /* State should be equivalent to INIT */ - if (!shared || shared->policy) - return -EBUSY; + policy_dbs->is_shared = policy_is_shared(policy); + policy_dbs->rate_mult = 1; - if (cdata->governor == GOV_CONSERVATIVE) { - struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; - - sampling_rate = cs_tuners->sampling_rate; - ignore_nice = cs_tuners->ignore_nice_load; - } else { - struct od_dbs_tuners *od_tuners = dbs_data->tuners; - - sampling_rate = od_tuners->sampling_rate; - ignore_nice = od_tuners->ignore_nice_load; - io_busy = od_tuners->io_is_busy; - } - - shared->policy = policy; - shared->time_stamp = ktime_get(); + sampling_rate = dbs_data->sampling_rate; + ignore_nice = dbs_data->ignore_nice_load; + io_busy = dbs_data->io_is_busy; for_each_cpu(j, policy->cpus) { - struct cpu_dbs_info *j_cdbs = cdata->get_cpu_cdbs(j); + struct cpu_dbs_info *j_cdbs = &per_cpu(cpu_dbs, j); unsigned int prev_load; - j_cdbs->prev_cpu_idle = - get_cpu_idle_time(j, &j_cdbs->prev_cpu_wall, io_busy); + j_cdbs->prev_cpu_idle = get_cpu_idle_time(j, &j_cdbs->prev_cpu_wall, io_busy); - prev_load = (unsigned int)(j_cdbs->prev_cpu_wall - - j_cdbs->prev_cpu_idle); - j_cdbs->prev_load = 100 * prev_load / - (unsigned int)j_cdbs->prev_cpu_wall; + prev_load = j_cdbs->prev_cpu_wall - j_cdbs->prev_cpu_idle; + j_cdbs->prev_load = 100 * prev_load / (unsigned int)j_cdbs->prev_cpu_wall; if (ignore_nice) j_cdbs->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE]; - - __setup_timer(&j_cdbs->timer, dbs_timer_handler, - (unsigned long)j_cdbs, - TIMER_DEFERRABLE | TIMER_IRQSAFE); } - if (cdata->governor == GOV_CONSERVATIVE) { - struct cs_cpu_dbs_info_s *cs_dbs_info = - cdata->get_cpu_dbs_info_s(cpu); - - cs_dbs_info->down_skip = 0; - cs_dbs_info->requested_freq = policy->cur; - } else { - struct od_ops *od_ops = cdata->gov_ops; - struct od_cpu_dbs_info_s *od_dbs_info = cdata->get_cpu_dbs_info_s(cpu); - - od_dbs_info->rate_mult = 1; - od_dbs_info->sample_type = OD_NORMAL_SAMPLE; - od_ops->powersave_bias_init_cpu(cpu); - } + gov->start(policy); - gov_add_timers(policy, delay_for_sampling_rate(sampling_rate)); + gov_set_update_util(policy_dbs, sampling_rate); return 0; } -static int cpufreq_governor_stop(struct cpufreq_policy *policy, - struct dbs_data *dbs_data) +static int cpufreq_governor_stop(struct cpufreq_policy *policy) { - struct cpu_dbs_info *cdbs = dbs_data->cdata->get_cpu_cdbs(policy->cpu); - struct cpu_common_dbs_info *shared = cdbs->shared; - - /* State should be equivalent to START */ - if (!shared || !shared->policy) - return -EBUSY; - - gov_cancel_work(shared); - shared->policy = NULL; - + gov_cancel_work(policy); return 0; } -static int cpufreq_governor_limits(struct cpufreq_policy *policy, - struct dbs_data *dbs_data) +static int cpufreq_governor_limits(struct cpufreq_policy *policy) { - struct common_dbs_data *cdata = dbs_data->cdata; - unsigned int cpu = policy->cpu; - struct cpu_dbs_info *cdbs = cdata->get_cpu_cdbs(cpu); + struct policy_dbs_info *policy_dbs = policy->governor_data; - /* State should be equivalent to START */ - if (!cdbs->shared || !cdbs->shared->policy) - return -EBUSY; + mutex_lock(&policy_dbs->timer_mutex); + + if (policy->max < policy->cur) + __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H); + else if (policy->min > policy->cur) + __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); + + gov_update_sample_delay(policy_dbs, 0); - mutex_lock(&cdbs->shared->timer_mutex); - if (policy->max < cdbs->shared->policy->cur) - __cpufreq_driver_target(cdbs->shared->policy, policy->max, - CPUFREQ_RELATION_H); - else if (policy->min > cdbs->shared->policy->cur) - __cpufreq_driver_target(cdbs->shared->policy, policy->min, - CPUFREQ_RELATION_L); - dbs_check_cpu(dbs_data, cpu); - mutex_unlock(&cdbs->shared->timer_mutex); + mutex_unlock(&policy_dbs->timer_mutex); return 0; } -int cpufreq_governor_dbs(struct cpufreq_policy *policy, - struct common_dbs_data *cdata, unsigned int event) +int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event) { - struct dbs_data *dbs_data; - int ret; - - /* Lock governor to block concurrent initialization of governor */ - mutex_lock(&cdata->mutex); - - if (have_governor_per_policy()) - dbs_data = policy->governor_data; - else - dbs_data = cdata->gdbs_data; - - if (!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT)) { - ret = -EINVAL; - goto unlock; - } - - switch (event) { - case CPUFREQ_GOV_POLICY_INIT: - ret = cpufreq_governor_init(policy, dbs_data, cdata); - break; - case CPUFREQ_GOV_POLICY_EXIT: - ret = cpufreq_governor_exit(policy, dbs_data); - break; - case CPUFREQ_GOV_START: - ret = cpufreq_governor_start(policy, dbs_data); - break; - case CPUFREQ_GOV_STOP: - ret = cpufreq_governor_stop(policy, dbs_data); - break; - case CPUFREQ_GOV_LIMITS: - ret = cpufreq_governor_limits(policy, dbs_data); - break; - default: - ret = -EINVAL; + if (event == CPUFREQ_GOV_POLICY_INIT) { + return cpufreq_governor_init(policy); + } else if (policy->governor_data) { + switch (event) { + case CPUFREQ_GOV_POLICY_EXIT: + return cpufreq_governor_exit(policy); + case CPUFREQ_GOV_START: + return cpufreq_governor_start(policy); + case CPUFREQ_GOV_STOP: + return cpufreq_governor_stop(policy); + case CPUFREQ_GOV_LIMITS: + return cpufreq_governor_limits(policy); + } } - -unlock: - mutex_unlock(&cdata->mutex); - - return ret; + return -EINVAL; } EXPORT_SYMBOL_GPL(cpufreq_governor_dbs); diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h index 91e767a05..61ff82fe0 100644 --- a/drivers/cpufreq/cpufreq_governor.h +++ b/drivers/cpufreq/cpufreq_governor.h @@ -18,6 +18,7 @@ #define _CPUFREQ_GOVERNOR_H #include <linux/atomic.h> +#include <linux/irq_work.h> #include <linux/cpufreq.h> #include <linux/kernel_stat.h> #include <linux/module.h> @@ -41,96 +42,68 @@ enum {OD_NORMAL_SAMPLE, OD_SUB_SAMPLE}; /* - * Macro for creating governors sysfs routines - * - * - gov_sys: One governor instance per whole system - * - gov_pol: One governor instance per policy + * Abbreviations: + * dbs: used as a shortform for demand based switching It helps to keep variable + * names smaller, simpler + * cdbs: common dbs + * od_*: On-demand governor + * cs_*: Conservative governor */ -/* Create attributes */ -#define gov_sys_attr_ro(_name) \ -static struct global_attr _name##_gov_sys = \ -__ATTR(_name, 0444, show_##_name##_gov_sys, NULL) - -#define gov_sys_attr_rw(_name) \ -static struct global_attr _name##_gov_sys = \ -__ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys) - -#define gov_pol_attr_ro(_name) \ -static struct freq_attr _name##_gov_pol = \ -__ATTR(_name, 0444, show_##_name##_gov_pol, NULL) - -#define gov_pol_attr_rw(_name) \ -static struct freq_attr _name##_gov_pol = \ -__ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol) +/* Governor demand based switching data (per-policy or global). */ +struct dbs_data { + int usage_count; + void *tuners; + unsigned int min_sampling_rate; + unsigned int ignore_nice_load; + unsigned int sampling_rate; + unsigned int sampling_down_factor; + unsigned int up_threshold; + unsigned int io_is_busy; -#define gov_sys_pol_attr_rw(_name) \ - gov_sys_attr_rw(_name); \ - gov_pol_attr_rw(_name) + struct kobject kobj; + struct list_head policy_dbs_list; + /* + * Protect concurrent updates to governor tunables from sysfs, + * policy_dbs_list and usage_count. + */ + struct mutex mutex; +}; -#define gov_sys_pol_attr_ro(_name) \ - gov_sys_attr_ro(_name); \ - gov_pol_attr_ro(_name) +/* Governor's specific attributes */ +struct dbs_data; +struct governor_attr { + struct attribute attr; + ssize_t (*show)(struct dbs_data *dbs_data, char *buf); + ssize_t (*store)(struct dbs_data *dbs_data, const char *buf, + size_t count); +}; -/* Create show/store routines */ -#define show_one(_gov, file_name) \ -static ssize_t show_##file_name##_gov_sys \ -(struct kobject *kobj, struct attribute *attr, char *buf) \ +#define gov_show_one(_gov, file_name) \ +static ssize_t show_##file_name \ +(struct dbs_data *dbs_data, char *buf) \ { \ - struct _gov##_dbs_tuners *tuners = _gov##_dbs_cdata.gdbs_data->tuners; \ - return sprintf(buf, "%u\n", tuners->file_name); \ -} \ - \ -static ssize_t show_##file_name##_gov_pol \ -(struct cpufreq_policy *policy, char *buf) \ -{ \ - struct dbs_data *dbs_data = policy->governor_data; \ struct _gov##_dbs_tuners *tuners = dbs_data->tuners; \ return sprintf(buf, "%u\n", tuners->file_name); \ } -#define store_one(_gov, file_name) \ -static ssize_t store_##file_name##_gov_sys \ -(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) \ -{ \ - struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \ - return store_##file_name(dbs_data, buf, count); \ -} \ - \ -static ssize_t store_##file_name##_gov_pol \ -(struct cpufreq_policy *policy, const char *buf, size_t count) \ +#define gov_show_one_common(file_name) \ +static ssize_t show_##file_name \ +(struct dbs_data *dbs_data, char *buf) \ { \ - struct dbs_data *dbs_data = policy->governor_data; \ - return store_##file_name(dbs_data, buf, count); \ + return sprintf(buf, "%u\n", dbs_data->file_name); \ } -#define show_store_one(_gov, file_name) \ -show_one(_gov, file_name); \ -store_one(_gov, file_name) +#define gov_attr_ro(_name) \ +static struct governor_attr _name = \ +__ATTR(_name, 0444, show_##_name, NULL) -/* create helper routines */ -#define define_get_cpu_dbs_routines(_dbs_info) \ -static struct cpu_dbs_info *get_cpu_cdbs(int cpu) \ -{ \ - return &per_cpu(_dbs_info, cpu).cdbs; \ -} \ - \ -static void *get_cpu_dbs_info_s(int cpu) \ -{ \ - return &per_cpu(_dbs_info, cpu); \ -} - -/* - * Abbreviations: - * dbs: used as a shortform for demand based switching It helps to keep variable - * names smaller, simpler - * cdbs: common dbs - * od_*: On-demand governor - * cs_*: Conservative governor - */ +#define gov_attr_rw(_name) \ +static struct governor_attr _name = \ +__ATTR(_name, 0644, show_##_name, store_##_name) /* Common to all CPUs of a policy */ -struct cpu_common_dbs_info { +struct policy_dbs_info { struct cpufreq_policy *policy; /* * Per policy mutex that serializes load evaluation from limit-change @@ -138,11 +111,27 @@ struct cpu_common_dbs_info { */ struct mutex timer_mutex; - ktime_t time_stamp; - atomic_t skip_work; + u64 last_sample_time; + s64 sample_delay_ns; + atomic_t work_count; + struct irq_work irq_work; struct work_struct work; + /* dbs_data may be shared between multiple policy objects */ + struct dbs_data *dbs_data; + struct list_head list; + /* Multiplier for increasing sample delay temporarily. */ + unsigned int rate_mult; + /* Status indicators */ + bool is_shared; /* This object is used by multiple CPUs */ + bool work_in_progress; /* Work is being queued up or in progress */ }; +static inline void gov_update_sample_delay(struct policy_dbs_info *policy_dbs, + unsigned int delay_us) +{ + policy_dbs->sample_delay_ns = delay_us * NSEC_PER_USEC; +} + /* Per cpu structures */ struct cpu_dbs_info { u64 prev_cpu_idle; @@ -155,54 +144,14 @@ struct cpu_dbs_info { * wake-up from idle. */ unsigned int prev_load; - struct timer_list timer; - struct cpu_common_dbs_info *shared; -}; - -struct od_cpu_dbs_info_s { - struct cpu_dbs_info cdbs; - struct cpufreq_frequency_table *freq_table; - unsigned int freq_lo; - unsigned int freq_lo_jiffies; - unsigned int freq_hi_jiffies; - unsigned int rate_mult; - unsigned int sample_type:1; -}; - -struct cs_cpu_dbs_info_s { - struct cpu_dbs_info cdbs; - unsigned int down_skip; - unsigned int requested_freq; -}; - -/* Per policy Governors sysfs tunables */ -struct od_dbs_tuners { - unsigned int ignore_nice_load; - unsigned int sampling_rate; - unsigned int sampling_down_factor; - unsigned int up_threshold; - unsigned int powersave_bias; - unsigned int io_is_busy; -}; - -struct cs_dbs_tuners { - unsigned int ignore_nice_load; - unsigned int sampling_rate; - unsigned int sampling_down_factor; - unsigned int up_threshold; - unsigned int down_threshold; - unsigned int freq_step; + struct update_util_data update_util; + struct policy_dbs_info *policy_dbs; }; /* Common Governor data across policies */ -struct dbs_data; -struct common_dbs_data { - /* Common across governors */ - #define GOV_ONDEMAND 0 - #define GOV_CONSERVATIVE 1 - int governor; - struct attribute_group *attr_group_gov_sys; /* one governor - system */ - struct attribute_group *attr_group_gov_pol; /* one governor - policy */ +struct dbs_governor { + struct cpufreq_governor gov; + struct kobj_type kobj_type; /* * Common data for platforms that don't set @@ -210,74 +159,32 @@ struct common_dbs_data { */ struct dbs_data *gdbs_data; - struct cpu_dbs_info *(*get_cpu_cdbs)(int cpu); - void *(*get_cpu_dbs_info_s)(int cpu); - unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy, - bool modify_all); - void (*gov_check_cpu)(int cpu, unsigned int load); + unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy); + struct policy_dbs_info *(*alloc)(void); + void (*free)(struct policy_dbs_info *policy_dbs); int (*init)(struct dbs_data *dbs_data, bool notify); void (*exit)(struct dbs_data *dbs_data, bool notify); - - /* Governor specific ops, see below */ - void *gov_ops; - - /* - * Protects governor's data (struct dbs_data and struct common_dbs_data) - */ - struct mutex mutex; + void (*start)(struct cpufreq_policy *policy); }; -/* Governor Per policy data */ -struct dbs_data { - struct common_dbs_data *cdata; - unsigned int min_sampling_rate; - int usage_count; - void *tuners; -}; +static inline struct dbs_governor *dbs_governor_of(struct cpufreq_policy *policy) +{ + return container_of(policy->governor, struct dbs_governor, gov); +} -/* Governor specific ops, will be passed to dbs_data->gov_ops */ +/* Governor specific operations */ struct od_ops { - void (*powersave_bias_init_cpu)(int cpu); unsigned int (*powersave_bias_target)(struct cpufreq_policy *policy, unsigned int freq_next, unsigned int relation); - void (*freq_increase)(struct cpufreq_policy *policy, unsigned int freq); }; -static inline int delay_for_sampling_rate(unsigned int sampling_rate) -{ - int delay = usecs_to_jiffies(sampling_rate); - - /* We want all CPUs to do sampling nearly on same jiffy */ - if (num_online_cpus() > 1) - delay -= jiffies % delay; - - return delay; -} - -#define declare_show_sampling_rate_min(_gov) \ -static ssize_t show_sampling_rate_min_gov_sys \ -(struct kobject *kobj, struct attribute *attr, char *buf) \ -{ \ - struct dbs_data *dbs_data = _gov##_dbs_cdata.gdbs_data; \ - return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \ -} \ - \ -static ssize_t show_sampling_rate_min_gov_pol \ -(struct cpufreq_policy *policy, char *buf) \ -{ \ - struct dbs_data *dbs_data = policy->governor_data; \ - return sprintf(buf, "%u\n", dbs_data->min_sampling_rate); \ -} - -extern struct mutex cpufreq_governor_lock; - -void gov_add_timers(struct cpufreq_policy *policy, unsigned int delay); -void gov_cancel_work(struct cpu_common_dbs_info *shared); -void dbs_check_cpu(struct dbs_data *dbs_data, int cpu); -int cpufreq_governor_dbs(struct cpufreq_policy *policy, - struct common_dbs_data *cdata, unsigned int event); +unsigned int dbs_update(struct cpufreq_policy *policy); +int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event); void od_register_powersave_bias_handler(unsigned int (*f) (struct cpufreq_policy *, unsigned int, unsigned int), unsigned int powersave_bias); void od_unregister_powersave_bias_handler(void); +ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, + size_t count); +void gov_update_cpu_data(struct dbs_data *dbs_data); #endif /* _CPUFREQ_GOVERNOR_H */ diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 38fbd8771..aa7ed7068 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -16,7 +16,8 @@ #include <linux/percpu-defs.h> #include <linux/slab.h> #include <linux/tick.h> -#include "cpufreq_governor.h" + +#include "cpufreq_ondemand.h" /* On-demand governor macros */ #ifdef CONFIG_SCHED_BFS @@ -36,24 +37,10 @@ #define MIN_FREQUENCY_UP_THRESHOLD (11) #define MAX_FREQUENCY_UP_THRESHOLD (100) -static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info); - static struct od_ops od_ops; -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND -static struct cpufreq_governor cpufreq_gov_ondemand; -#endif - static unsigned int default_powersave_bias; -static void ondemand_powersave_bias_init_cpu(int cpu) -{ - struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); - - dbs_info->freq_table = cpufreq_frequency_get_table(cpu); - dbs_info->freq_lo = 0; -} - /* * Not all CPUs want IO time to be accounted as busy; this depends on how * efficient idling at a higher frequency/voltage is. @@ -79,8 +66,8 @@ static int should_io_be_busy(void) /* * Find right freq to be set now with powersave_bias on. - * Returns the freq_hi to be used right now and will set freq_hi_jiffies, - * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. + * Returns the freq_hi to be used right now and will set freq_hi_delay_us, + * freq_lo, and freq_lo_delay_us in percpu area for averaging freqs. */ static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, unsigned int freq_next, unsigned int relation) @@ -88,15 +75,15 @@ static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, unsigned int freq_req, freq_reduc, freq_avg; unsigned int freq_hi, freq_lo; unsigned int index = 0; - unsigned int jiffies_total, jiffies_hi, jiffies_lo; - struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, - policy->cpu); - struct dbs_data *dbs_data = policy->governor_data; + unsigned int delay_hi_us; + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); + struct dbs_data *dbs_data = policy_dbs->dbs_data; struct od_dbs_tuners *od_tuners = dbs_data->tuners; if (!dbs_info->freq_table) { dbs_info->freq_lo = 0; - dbs_info->freq_lo_jiffies = 0; + dbs_info->freq_lo_delay_us = 0; return freq_next; } @@ -119,31 +106,30 @@ static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, /* Find out how long we have to be in hi and lo freqs */ if (freq_hi == freq_lo) { dbs_info->freq_lo = 0; - dbs_info->freq_lo_jiffies = 0; + dbs_info->freq_lo_delay_us = 0; return freq_lo; } - jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate); - jiffies_hi = (freq_avg - freq_lo) * jiffies_total; - jiffies_hi += ((freq_hi - freq_lo) / 2); - jiffies_hi /= (freq_hi - freq_lo); - jiffies_lo = jiffies_total - jiffies_hi; + delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate; + delay_hi_us += (freq_hi - freq_lo) / 2; + delay_hi_us /= freq_hi - freq_lo; + dbs_info->freq_hi_delay_us = delay_hi_us; dbs_info->freq_lo = freq_lo; - dbs_info->freq_lo_jiffies = jiffies_lo; - dbs_info->freq_hi_jiffies = jiffies_hi; + dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us; return freq_hi; } -static void ondemand_powersave_bias_init(void) +static void ondemand_powersave_bias_init(struct cpufreq_policy *policy) { - int i; - for_each_online_cpu(i) { - ondemand_powersave_bias_init_cpu(i); - } + struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); + + dbs_info->freq_table = cpufreq_frequency_get_table(policy->cpu); + dbs_info->freq_lo = 0; } static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) { - struct dbs_data *dbs_data = policy->governor_data; + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct dbs_data *dbs_data = policy_dbs->dbs_data; struct od_dbs_tuners *od_tuners = dbs_data->tuners; if (od_tuners->powersave_bias) @@ -161,21 +147,21 @@ static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) * (default), then we try to increase frequency. Else, we adjust the frequency * proportional to load. */ -static void od_check_cpu(int cpu, unsigned int load) +static void od_update(struct cpufreq_policy *policy) { - struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); - struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy; - struct dbs_data *dbs_data = policy->governor_data; + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); + struct dbs_data *dbs_data = policy_dbs->dbs_data; struct od_dbs_tuners *od_tuners = dbs_data->tuners; + unsigned int load = dbs_update(policy); dbs_info->freq_lo = 0; /* Check for frequency increase */ - if (load > od_tuners->up_threshold) { + if (load > dbs_data->up_threshold) { /* If switching to max speed, apply sampling_down_factor */ if (policy->cur < policy->max) - dbs_info->rate_mult = - od_tuners->sampling_down_factor; + policy_dbs->rate_mult = dbs_data->sampling_down_factor; dbs_freq_increase(policy, policy->max); } else { /* Calculate the next frequency proportional to load */ @@ -186,177 +172,70 @@ static void od_check_cpu(int cpu, unsigned int load) freq_next = min_f + load * (max_f - min_f) / 100; /* No longer fully busy, reset rate_mult */ - dbs_info->rate_mult = 1; + policy_dbs->rate_mult = 1; - if (!od_tuners->powersave_bias) { - __cpufreq_driver_target(policy, freq_next, - CPUFREQ_RELATION_C); - return; - } + if (od_tuners->powersave_bias) + freq_next = od_ops.powersave_bias_target(policy, + freq_next, + CPUFREQ_RELATION_L); - freq_next = od_ops.powersave_bias_target(policy, freq_next, - CPUFREQ_RELATION_L); __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); } } -static unsigned int od_dbs_timer(struct cpufreq_policy *policy, bool modify_all) +static unsigned int od_dbs_timer(struct cpufreq_policy *policy) { - struct dbs_data *dbs_data = policy->governor_data; - unsigned int cpu = policy->cpu; - struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, - cpu); - struct od_dbs_tuners *od_tuners = dbs_data->tuners; - int delay = 0, sample_type = dbs_info->sample_type; - - if (!modify_all) - goto max_delay; + struct policy_dbs_info *policy_dbs = policy->governor_data; + struct dbs_data *dbs_data = policy_dbs->dbs_data; + struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); + int sample_type = dbs_info->sample_type; /* Common NORMAL_SAMPLE setup */ dbs_info->sample_type = OD_NORMAL_SAMPLE; - if (sample_type == OD_SUB_SAMPLE) { - delay = dbs_info->freq_lo_jiffies; + /* + * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore + * it then. + */ + if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { __cpufreq_driver_target(policy, dbs_info->freq_lo, CPUFREQ_RELATION_H); - } else { - dbs_check_cpu(dbs_data, cpu); - if (dbs_info->freq_lo) { - /* Setup timer for SUB_SAMPLE */ - dbs_info->sample_type = OD_SUB_SAMPLE; - delay = dbs_info->freq_hi_jiffies; - } + return dbs_info->freq_lo_delay_us; } -max_delay: - if (!delay) - delay = delay_for_sampling_rate(od_tuners->sampling_rate - * dbs_info->rate_mult); - - return delay; -} - -/************************** sysfs interface ************************/ -static struct common_dbs_data od_dbs_cdata; - -/** - * update_sampling_rate - update sampling rate effective immediately if needed. - * @new_rate: new sampling rate - * - * If new rate is smaller than the old, simply updating - * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the - * original sampling_rate was 1 second and the requested new sampling rate is 10 - * ms because the user needs immediate reaction from ondemand governor, but not - * sure if higher frequency will be required or not, then, the governor may - * change the sampling rate too late; up to 1 second later. Thus, if we are - * reducing the sampling rate, we need to make the new value effective - * immediately. - */ -static void update_sampling_rate(struct dbs_data *dbs_data, - unsigned int new_rate) -{ - struct od_dbs_tuners *od_tuners = dbs_data->tuners; - struct cpumask cpumask; - int cpu; - - od_tuners->sampling_rate = new_rate = max(new_rate, - dbs_data->min_sampling_rate); - - /* - * Lock governor so that governor start/stop can't execute in parallel. - */ - mutex_lock(&od_dbs_cdata.mutex); - - cpumask_copy(&cpumask, cpu_online_mask); - - for_each_cpu(cpu, &cpumask) { - struct cpufreq_policy *policy; - struct od_cpu_dbs_info_s *dbs_info; - struct cpu_dbs_info *cdbs; - struct cpu_common_dbs_info *shared; - unsigned long next_sampling, appointed_at; - - dbs_info = &per_cpu(od_cpu_dbs_info, cpu); - cdbs = &dbs_info->cdbs; - shared = cdbs->shared; - - /* - * A valid shared and shared->policy means governor hasn't - * stopped or exited yet. - */ - if (!shared || !shared->policy) - continue; - - policy = shared->policy; - - /* clear all CPUs of this policy */ - cpumask_andnot(&cpumask, &cpumask, policy->cpus); + od_update(policy); - /* - * Update sampling rate for CPUs whose policy is governed by - * dbs_data. In case of governor_per_policy, only a single - * policy will be governed by dbs_data, otherwise there can be - * multiple policies that are governed by the same dbs_data. - */ - if (dbs_data != policy->governor_data) - continue; - - /* - * Checking this for any CPU should be fine, timers for all of - * them are scheduled together. - */ - next_sampling = jiffies + usecs_to_jiffies(new_rate); - appointed_at = dbs_info->cdbs.timer.expires; - - if (time_before(next_sampling, appointed_at)) { - gov_cancel_work(shared); - gov_add_timers(policy, usecs_to_jiffies(new_rate)); - - } + if (dbs_info->freq_lo) { + /* Setup timer for SUB_SAMPLE */ + dbs_info->sample_type = OD_SUB_SAMPLE; + return dbs_info->freq_hi_delay_us; } - mutex_unlock(&od_dbs_cdata.mutex); + return dbs_data->sampling_rate * policy_dbs->rate_mult; } -static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, - size_t count) -{ - unsigned int input; - int ret; - ret = sscanf(buf, "%u", &input); - if (ret != 1) - return -EINVAL; - - update_sampling_rate(dbs_data, input); - return count; -} +/************************** sysfs interface ************************/ +static struct dbs_governor od_dbs_gov; static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, size_t count) { - struct od_dbs_tuners *od_tuners = dbs_data->tuners; unsigned int input; int ret; - unsigned int j; ret = sscanf(buf, "%u", &input); if (ret != 1) return -EINVAL; - od_tuners->io_is_busy = !!input; + dbs_data->io_is_busy = !!input; /* we need to re-evaluate prev_cpu_idle */ - for_each_online_cpu(j) { - struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, - j); - dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, - &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); - } + gov_update_cpu_data(dbs_data); + return count; } static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, size_t count) { - struct od_dbs_tuners *od_tuners = dbs_data->tuners; unsigned int input; int ret; ret = sscanf(buf, "%u", &input); @@ -366,40 +245,43 @@ static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, return -EINVAL; } - od_tuners->up_threshold = input; + dbs_data->up_threshold = input; return count; } static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, const char *buf, size_t count) { - struct od_dbs_tuners *od_tuners = dbs_data->tuners; - unsigned int input, j; + struct policy_dbs_info *policy_dbs; + unsigned int input; int ret; ret = sscanf(buf, "%u", &input); if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) return -EINVAL; - od_tuners->sampling_down_factor = input; + + dbs_data->sampling_down_factor = input; /* Reset down sampling multiplier in case it was active */ - for_each_online_cpu(j) { - struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, - j); - dbs_info->rate_mult = 1; + list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) { + /* + * Doing this without locking might lead to using different + * rate_mult values in od_update() and od_dbs_timer(). + */ + mutex_lock(&policy_dbs->timer_mutex); + policy_dbs->rate_mult = 1; + mutex_unlock(&policy_dbs->timer_mutex); } + return count; } static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, const char *buf, size_t count) { - struct od_dbs_tuners *od_tuners = dbs_data->tuners; unsigned int input; int ret; - unsigned int j; - ret = sscanf(buf, "%u", &input); if (ret != 1) return -EINVAL; @@ -407,22 +289,14 @@ static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, if (input > 1) input = 1; - if (input == od_tuners->ignore_nice_load) { /* nothing to do */ + if (input == dbs_data->ignore_nice_load) { /* nothing to do */ return count; } - od_tuners->ignore_nice_load = input; + dbs_data->ignore_nice_load = input; /* we need to re-evaluate prev_cpu_idle */ - for_each_online_cpu(j) { - struct od_cpu_dbs_info_s *dbs_info; - dbs_info = &per_cpu(od_cpu_dbs_info, j); - dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, - &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); - if (od_tuners->ignore_nice_load) - dbs_info->cdbs.prev_cpu_nice = - kcpustat_cpu(j).cpustat[CPUTIME_NICE]; + gov_update_cpu_data(dbs_data); - } return count; } @@ -430,6 +304,7 @@ static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, size_t count) { struct od_dbs_tuners *od_tuners = dbs_data->tuners; + struct policy_dbs_info *policy_dbs; unsigned int input; int ret; ret = sscanf(buf, "%u", &input); @@ -441,59 +316,54 @@ static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, input = 1000; od_tuners->powersave_bias = input; - ondemand_powersave_bias_init(); + + list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) + ondemand_powersave_bias_init(policy_dbs->policy); + return count; } -show_store_one(od, sampling_rate); -show_store_one(od, io_is_busy); -show_store_one(od, up_threshold); -show_store_one(od, sampling_down_factor); -show_store_one(od, ignore_nice_load); -show_store_one(od, powersave_bias); -declare_show_sampling_rate_min(od); - -gov_sys_pol_attr_rw(sampling_rate); -gov_sys_pol_attr_rw(io_is_busy); -gov_sys_pol_attr_rw(up_threshold); -gov_sys_pol_attr_rw(sampling_down_factor); -gov_sys_pol_attr_rw(ignore_nice_load); -gov_sys_pol_attr_rw(powersave_bias); -gov_sys_pol_attr_ro(sampling_rate_min); - -static struct attribute *dbs_attributes_gov_sys[] = { - &sampling_rate_min_gov_sys.attr, - &sampling_rate_gov_sys.attr, - &up_threshold_gov_sys.attr, - &sampling_down_factor_gov_sys.attr, - &ignore_nice_load_gov_sys.attr, - &powersave_bias_gov_sys.attr, - &io_is_busy_gov_sys.attr, +gov_show_one_common(sampling_rate); +gov_show_one_common(up_threshold); +gov_show_one_common(sampling_down_factor); +gov_show_one_common(ignore_nice_load); +gov_show_one_common(min_sampling_rate); +gov_show_one_common(io_is_busy); +gov_show_one(od, powersave_bias); + +gov_attr_rw(sampling_rate); +gov_attr_rw(io_is_busy); +gov_attr_rw(up_threshold); +gov_attr_rw(sampling_down_factor); +gov_attr_rw(ignore_nice_load); +gov_attr_rw(powersave_bias); +gov_attr_ro(min_sampling_rate); + +static struct attribute *od_attributes[] = { + &min_sampling_rate.attr, + &sampling_rate.attr, + &up_threshold.attr, + &sampling_down_factor.attr, + &ignore_nice_load.attr, + &powersave_bias.attr, + &io_is_busy.attr, NULL }; -static struct attribute_group od_attr_group_gov_sys = { - .attrs = dbs_attributes_gov_sys, - .name = "ondemand", -}; +/************************** sysfs end ************************/ -static struct attribute *dbs_attributes_gov_pol[] = { - &sampling_rate_min_gov_pol.attr, - &sampling_rate_gov_pol.attr, - &up_threshold_gov_pol.attr, - &sampling_down_factor_gov_pol.attr, - &ignore_nice_load_gov_pol.attr, - &powersave_bias_gov_pol.attr, - &io_is_busy_gov_pol.attr, - NULL -}; +static struct policy_dbs_info *od_alloc(void) +{ + struct od_policy_dbs_info *dbs_info; -static struct attribute_group od_attr_group_gov_pol = { - .attrs = dbs_attributes_gov_pol, - .name = "ondemand", -}; + dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); + return dbs_info ? &dbs_info->policy_dbs : NULL; +} -/************************** sysfs end ************************/ +static void od_free(struct policy_dbs_info *policy_dbs) +{ + kfree(to_dbs_info(policy_dbs)); +} static int od_init(struct dbs_data *dbs_data, bool notify) { @@ -512,7 +382,7 @@ static int od_init(struct dbs_data *dbs_data, bool notify) put_cpu(); if (idle_time != -1ULL) { /* Idle micro accounting is supported. Use finer thresholds */ - tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; + dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; /* * In nohz/micro accounting case we set the minimum frequency * not depending on HZ, but fixed (very low). The deferred @@ -520,17 +390,17 @@ static int od_init(struct dbs_data *dbs_data, bool notify) */ dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; } else { - tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; + dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; /* For correct statistics, we need 10 ticks for each measure */ dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10); } - tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; - tuners->ignore_nice_load = 0; + dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; + dbs_data->ignore_nice_load = 0; tuners->powersave_bias = default_powersave_bias; - tuners->io_is_busy = should_io_be_busy(); + dbs_data->io_is_busy = should_io_be_busy(); dbs_data->tuners = tuners; return 0; @@ -541,33 +411,38 @@ static void od_exit(struct dbs_data *dbs_data, bool notify) kfree(dbs_data->tuners); } -define_get_cpu_dbs_routines(od_cpu_dbs_info); +static void od_start(struct cpufreq_policy *policy) +{ + struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); + + dbs_info->sample_type = OD_NORMAL_SAMPLE; + ondemand_powersave_bias_init(policy); +} static struct od_ops od_ops = { - .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, .powersave_bias_target = generic_powersave_bias_target, - .freq_increase = dbs_freq_increase, }; -static struct common_dbs_data od_dbs_cdata = { - .governor = GOV_ONDEMAND, - .attr_group_gov_sys = &od_attr_group_gov_sys, - .attr_group_gov_pol = &od_attr_group_gov_pol, - .get_cpu_cdbs = get_cpu_cdbs, - .get_cpu_dbs_info_s = get_cpu_dbs_info_s, +static struct dbs_governor od_dbs_gov = { + .gov = { + .name = "ondemand", + .governor = cpufreq_governor_dbs, + .max_transition_latency = TRANSITION_LATENCY_LIMIT, + .owner = THIS_MODULE, + }, + .kobj_type = { .default_attrs = od_attributes }, .gov_dbs_timer = od_dbs_timer, - .gov_check_cpu = od_check_cpu, - .gov_ops = &od_ops, + .alloc = od_alloc, + .free = od_free, .init = od_init, .exit = od_exit, - .mutex = __MUTEX_INITIALIZER(od_dbs_cdata.mutex), + .start = od_start, }; +#define CPU_FREQ_GOV_ONDEMAND (&od_dbs_gov.gov) + static void od_set_powersave_bias(unsigned int powersave_bias) { - struct cpufreq_policy *policy; - struct dbs_data *dbs_data; - struct od_dbs_tuners *od_tuners; unsigned int cpu; cpumask_t done; @@ -576,22 +451,25 @@ static void od_set_powersave_bias(unsigned int powersave_bias) get_online_cpus(); for_each_online_cpu(cpu) { - struct cpu_common_dbs_info *shared; + struct cpufreq_policy *policy; + struct policy_dbs_info *policy_dbs; + struct dbs_data *dbs_data; + struct od_dbs_tuners *od_tuners; if (cpumask_test_cpu(cpu, &done)) continue; - shared = per_cpu(od_cpu_dbs_info, cpu).cdbs.shared; - if (!shared) + policy = cpufreq_cpu_get_raw(cpu); + if (!policy || policy->governor != CPU_FREQ_GOV_ONDEMAND) continue; - policy = shared->policy; - cpumask_or(&done, &done, policy->cpus); - - if (policy->governor != &cpufreq_gov_ondemand) + policy_dbs = policy->governor_data; + if (!policy_dbs) continue; - dbs_data = policy->governor_data; + cpumask_or(&done, &done, policy->cpus); + + dbs_data = policy_dbs->dbs_data; od_tuners = dbs_data->tuners; od_tuners->powersave_bias = default_powersave_bias; } @@ -614,30 +492,14 @@ void od_unregister_powersave_bias_handler(void) } EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); -static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, - unsigned int event) -{ - return cpufreq_governor_dbs(policy, &od_dbs_cdata, event); -} - -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND -static -#endif -struct cpufreq_governor cpufreq_gov_ondemand = { - .name = "ondemand", - .governor = od_cpufreq_governor_dbs, - .max_transition_latency = TRANSITION_LATENCY_LIMIT, - .owner = THIS_MODULE, -}; - static int __init cpufreq_gov_dbs_init(void) { - return cpufreq_register_governor(&cpufreq_gov_ondemand); + return cpufreq_register_governor(CPU_FREQ_GOV_ONDEMAND); } static void __exit cpufreq_gov_dbs_exit(void) { - cpufreq_unregister_governor(&cpufreq_gov_ondemand); + cpufreq_unregister_governor(CPU_FREQ_GOV_ONDEMAND); } MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); @@ -647,6 +509,11 @@ MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " MODULE_LICENSE("GPL"); #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND +struct cpufreq_governor *cpufreq_default_governor(void) +{ + return CPU_FREQ_GOV_ONDEMAND; +} + fs_initcall(cpufreq_gov_dbs_init); #else module_init(cpufreq_gov_dbs_init); diff --git a/drivers/cpufreq/cpufreq_ondemand.h b/drivers/cpufreq/cpufreq_ondemand.h new file mode 100644 index 000000000..f0121db3c --- /dev/null +++ b/drivers/cpufreq/cpufreq_ondemand.h @@ -0,0 +1,30 @@ +/* + * Header file for CPUFreq ondemand governor and related code. + * + * Copyright (C) 2016, Intel Corporation + * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "cpufreq_governor.h" + +struct od_policy_dbs_info { + struct policy_dbs_info policy_dbs; + struct cpufreq_frequency_table *freq_table; + unsigned int freq_lo; + unsigned int freq_lo_delay_us; + unsigned int freq_hi_delay_us; + unsigned int sample_type:1; +}; + +static inline struct od_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs) +{ + return container_of(policy_dbs, struct od_policy_dbs_info, policy_dbs); +} + +struct od_dbs_tuners { + unsigned int powersave_bias; +}; diff --git a/drivers/cpufreq/cpufreq_performance.c b/drivers/cpufreq/cpufreq_performance.c index cf117deb3..af9f4b96f 100644 --- a/drivers/cpufreq/cpufreq_performance.c +++ b/drivers/cpufreq/cpufreq_performance.c @@ -33,10 +33,7 @@ static int cpufreq_governor_performance(struct cpufreq_policy *policy, return 0; } -#ifdef CONFIG_CPU_FREQ_GOV_PERFORMANCE_MODULE -static -#endif -struct cpufreq_governor cpufreq_gov_performance = { +static struct cpufreq_governor cpufreq_gov_performance = { .name = "performance", .governor = cpufreq_governor_performance, .owner = THIS_MODULE, @@ -52,6 +49,19 @@ static void __exit cpufreq_gov_performance_exit(void) cpufreq_unregister_governor(&cpufreq_gov_performance); } +#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE +struct cpufreq_governor *cpufreq_default_governor(void) +{ + return &cpufreq_gov_performance; +} +#endif +#ifndef CONFIG_CPU_FREQ_GOV_PERFORMANCE_MODULE +struct cpufreq_governor *cpufreq_fallback_governor(void) +{ + return &cpufreq_gov_performance; +} +#endif + MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); MODULE_DESCRIPTION("CPUfreq policy governor 'performance'"); MODULE_LICENSE("GPL"); diff --git a/drivers/cpufreq/cpufreq_powersave.c b/drivers/cpufreq/cpufreq_powersave.c index e3b874c23..b8b400232 100644 --- a/drivers/cpufreq/cpufreq_powersave.c +++ b/drivers/cpufreq/cpufreq_powersave.c @@ -33,10 +33,7 @@ static int cpufreq_governor_powersave(struct cpufreq_policy *policy, return 0; } -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE -static -#endif -struct cpufreq_governor cpufreq_gov_powersave = { +static struct cpufreq_governor cpufreq_gov_powersave = { .name = "powersave", .governor = cpufreq_governor_powersave, .owner = THIS_MODULE, @@ -57,6 +54,11 @@ MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'"); MODULE_LICENSE("GPL"); #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE +struct cpufreq_governor *cpufreq_default_governor(void) +{ + return &cpufreq_gov_powersave; +} + fs_initcall(cpufreq_gov_powersave_init); #else module_init(cpufreq_gov_powersave_init); diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c index 4dbf1db16..4d16f45ee 100644 --- a/drivers/cpufreq/cpufreq_userspace.c +++ b/drivers/cpufreq/cpufreq_userspace.c @@ -89,10 +89,7 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy, return rc; } -#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE -static -#endif -struct cpufreq_governor cpufreq_gov_userspace = { +static struct cpufreq_governor cpufreq_gov_userspace = { .name = "userspace", .governor = cpufreq_governor_userspace, .store_setspeed = cpufreq_set, @@ -116,6 +113,11 @@ MODULE_DESCRIPTION("CPUfreq policy governor 'userspace'"); MODULE_LICENSE("GPL"); #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE +struct cpufreq_governor *cpufreq_default_governor(void) +{ + return &cpufreq_gov_userspace; +} + fs_initcall(cpufreq_gov_userspace_init); #else module_init(cpufreq_gov_userspace_init); diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 3b29308f6..d63074ff6 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -64,6 +64,25 @@ static inline int ceiling_fp(int32_t x) return ret; } +/** + * struct sample - Store performance sample + * @core_pct_busy: Ratio of APERF/MPERF in percent, which is actual + * performance during last sample period + * @busy_scaled: Scaled busy value which is used to calculate next + * P state. This can be different than core_pct_busy + * to account for cpu idle period + * @aperf: Difference of actual performance frequency clock count + * read from APERF MSR between last and current sample + * @mperf: Difference of maximum performance frequency clock count + * read from MPERF MSR between last and current sample + * @tsc: Difference of time stamp counter between last and + * current sample + * @freq: Effective frequency calculated from APERF/MPERF + * @time: Current time from scheduler + * + * This structure is used in the cpudata structure to store performance sample + * data for choosing next P State. + */ struct sample { int32_t core_pct_busy; int32_t busy_scaled; @@ -71,9 +90,23 @@ struct sample { u64 mperf; u64 tsc; int freq; - ktime_t time; + u64 time; }; +/** + * struct pstate_data - Store P state data + * @current_pstate: Current requested P state + * @min_pstate: Min P state possible for this platform + * @max_pstate: Max P state possible for this platform + * @max_pstate_physical:This is physical Max P state for a processor + * This can be higher than the max_pstate which can + * be limited by platform thermal design power limits + * @scaling: Scaling factor to convert frequency to cpufreq + * frequency units + * @turbo_pstate: Max Turbo P state possible for this platform + * + * Stores the per cpu model P state limits and current P state. + */ struct pstate_data { int current_pstate; int min_pstate; @@ -83,6 +116,19 @@ struct pstate_data { int turbo_pstate; }; +/** + * struct vid_data - Stores voltage information data + * @min: VID data for this platform corresponding to + * the lowest P state + * @max: VID data corresponding to the highest P State. + * @turbo: VID data for turbo P state + * @ratio: Ratio of (vid max - vid min) / + * (max P state - Min P State) + * + * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling) + * This data is used in Atom platforms, where in addition to target P state, + * the voltage data needs to be specified to select next P State. + */ struct vid_data { int min; int max; @@ -90,6 +136,18 @@ struct vid_data { int32_t ratio; }; +/** + * struct _pid - Stores PID data + * @setpoint: Target set point for busyness or performance + * @integral: Storage for accumulated error values + * @p_gain: PID proportional gain + * @i_gain: PID integral gain + * @d_gain: PID derivative gain + * @deadband: PID deadband + * @last_err: Last error storage for integral part of PID calculation + * + * Stores PID coefficients and last error for PID controller. + */ struct _pid { int setpoint; int32_t integral; @@ -100,16 +158,33 @@ struct _pid { int32_t last_err; }; +/** + * struct cpudata - Per CPU instance data storage + * @cpu: CPU number for this instance data + * @update_util: CPUFreq utility callback information + * @pstate: Stores P state limits for this CPU + * @vid: Stores VID limits for this CPU + * @pid: Stores PID parameters for this CPU + * @last_sample_time: Last Sample time + * @prev_aperf: Last APERF value read from APERF MSR + * @prev_mperf: Last MPERF value read from MPERF MSR + * @prev_tsc: Last timestamp counter (TSC) value + * @prev_cummulative_iowait: IO Wait time difference from last and + * current sample + * @sample: Storage for storing last Sample data + * + * This structure stores per CPU instance data for all CPUs. + */ struct cpudata { int cpu; - struct timer_list timer; + struct update_util_data update_util; struct pstate_data pstate; struct vid_data vid; struct _pid pid; - ktime_t last_sample_time; + u64 last_sample_time; u64 prev_aperf; u64 prev_mperf; u64 prev_tsc; @@ -118,8 +193,22 @@ struct cpudata { }; static struct cpudata **all_cpu_data; + +/** + * struct pid_adjust_policy - Stores static PID configuration data + * @sample_rate_ms: PID calculation sample rate in ms + * @sample_rate_ns: Sample rate calculation in ns + * @deadband: PID deadband + * @setpoint: PID Setpoint + * @p_gain_pct: PID proportional gain + * @i_gain_pct: PID integral gain + * @d_gain_pct: PID derivative gain + * + * Stores per CPU model static PID configuration data. + */ struct pstate_adjust_policy { int sample_rate_ms; + s64 sample_rate_ns; int deadband; int setpoint; int p_gain_pct; @@ -127,17 +216,36 @@ struct pstate_adjust_policy { int i_gain_pct; }; +/** + * struct pstate_funcs - Per CPU model specific callbacks + * @get_max: Callback to get maximum non turbo effective P state + * @get_max_physical: Callback to get maximum non turbo physical P state + * @get_min: Callback to get minimum P state + * @get_turbo: Callback to get turbo P state + * @get_scaling: Callback to get frequency scaling factor + * @get_val: Callback to convert P state to actual MSR write value + * @get_vid: Callback to get VID data for Atom platforms + * @get_target_pstate: Callback to a function to calculate next P state to use + * + * Core and Atom CPU models have different way to get P State limits. This + * structure is used to store those callbacks. + */ struct pstate_funcs { int (*get_max)(void); int (*get_max_physical)(void); int (*get_min)(void); int (*get_turbo)(void); int (*get_scaling)(void); - void (*set)(struct cpudata*, int pstate); + u64 (*get_val)(struct cpudata*, int pstate); void (*get_vid)(struct cpudata *); int32_t (*get_target_pstate)(struct cpudata *); }; +/** + * struct cpu_defaults- Per CPU model default config data + * @pid_policy: PID config data + * @funcs: Callback function data + */ struct cpu_defaults { struct pstate_adjust_policy pid_policy; struct pstate_funcs funcs; @@ -150,6 +258,34 @@ static struct pstate_adjust_policy pid_params; static struct pstate_funcs pstate_funcs; static int hwp_active; + +/** + * struct perf_limits - Store user and policy limits + * @no_turbo: User requested turbo state from intel_pstate sysfs + * @turbo_disabled: Platform turbo status either from msr + * MSR_IA32_MISC_ENABLE or when maximum available pstate + * matches the maximum turbo pstate + * @max_perf_pct: Effective maximum performance limit in percentage, this + * is minimum of either limits enforced by cpufreq policy + * or limits from user set limits via intel_pstate sysfs + * @min_perf_pct: Effective minimum performance limit in percentage, this + * is maximum of either limits enforced by cpufreq policy + * or limits from user set limits via intel_pstate sysfs + * @max_perf: This is a scaled value between 0 to 255 for max_perf_pct + * This value is used to limit max pstate + * @min_perf: This is a scaled value between 0 to 255 for min_perf_pct + * This value is used to limit min pstate + * @max_policy_pct: The maximum performance in percentage enforced by + * cpufreq setpolicy interface + * @max_sysfs_pct: The maximum performance in percentage enforced by + * intel pstate sysfs interface + * @min_policy_pct: The minimum performance in percentage enforced by + * cpufreq setpolicy interface + * @min_sysfs_pct: The minimum performance in percentage enforced by + * intel pstate sysfs interface + * + * Storage for user and policy defined limits. + */ struct perf_limits { int no_turbo; int turbo_disabled; @@ -197,8 +333,8 @@ static struct perf_limits *limits = &powersave_limits; static inline void pid_reset(struct _pid *pid, int setpoint, int busy, int deadband, int integral) { - pid->setpoint = setpoint; - pid->deadband = deadband; + pid->setpoint = int_tofp(setpoint); + pid->deadband = int_tofp(deadband); pid->integral = int_tofp(integral); pid->last_err = int_tofp(setpoint) - int_tofp(busy); } @@ -224,9 +360,9 @@ static signed int pid_calc(struct _pid *pid, int32_t busy) int32_t pterm, dterm, fp_error; int32_t integral_limit; - fp_error = int_tofp(pid->setpoint) - busy; + fp_error = pid->setpoint - busy; - if (abs(fp_error) <= int_tofp(pid->deadband)) + if (abs(fp_error) <= pid->deadband) return 0; pterm = mul_fp(pid->p_gain, fp_error); @@ -286,7 +422,7 @@ static inline void update_turbo_state(void) cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); } -static void intel_pstate_hwp_set(void) +static void intel_pstate_hwp_set(const struct cpumask *cpumask) { int min, hw_min, max, hw_max, cpu, range, adj_range; u64 value, cap; @@ -296,9 +432,7 @@ static void intel_pstate_hwp_set(void) hw_max = HWP_HIGHEST_PERF(cap); range = hw_max - hw_min; - get_online_cpus(); - - for_each_online_cpu(cpu) { + for_each_cpu(cpu, cpumask) { rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); adj_range = limits->min_perf_pct * range / 100; min = hw_min + adj_range; @@ -317,7 +451,20 @@ static void intel_pstate_hwp_set(void) value |= HWP_MAX_PERF(max); wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); } +} +static int intel_pstate_hwp_set_policy(struct cpufreq_policy *policy) +{ + if (hwp_active) + intel_pstate_hwp_set(policy->cpus); + + return 0; +} + +static void intel_pstate_hwp_set_online_cpus(void) +{ + get_online_cpus(); + intel_pstate_hwp_set(cpu_online_mask); put_online_cpus(); } @@ -439,7 +586,7 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, limits->no_turbo = clamp_t(int, input, 0, 1); if (hwp_active) - intel_pstate_hwp_set(); + intel_pstate_hwp_set_online_cpus(); return count; } @@ -465,7 +612,7 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, int_tofp(100)); if (hwp_active) - intel_pstate_hwp_set(); + intel_pstate_hwp_set_online_cpus(); return count; } @@ -490,7 +637,7 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, int_tofp(100)); if (hwp_active) - intel_pstate_hwp_set(); + intel_pstate_hwp_set_online_cpus(); return count; } @@ -531,6 +678,9 @@ static void __init intel_pstate_sysfs_expose_params(void) static void intel_pstate_hwp_enable(struct cpudata *cpudata) { + /* First disable HWP notification interrupt as we don't process them */ + wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); + wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); } @@ -558,7 +708,7 @@ static int atom_get_turbo_pstate(void) return value & 0x7F; } -static void atom_set_pstate(struct cpudata *cpudata, int pstate) +static u64 atom_get_val(struct cpudata *cpudata, int pstate) { u64 val; int32_t vid_fp; @@ -583,9 +733,7 @@ static void atom_set_pstate(struct cpudata *cpudata, int pstate) cpu_nonscaling(cpudata->cpu); } - val |= vid; - - wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); + return val | vid; } static int silvermont_get_scaling(void) @@ -714,7 +862,7 @@ static inline int core_get_scaling(void) return 100000; } -static void core_set_pstate(struct cpudata *cpudata, int pstate) +static u64 core_get_val(struct cpudata *cpudata, int pstate) { u64 val; @@ -722,7 +870,7 @@ static void core_set_pstate(struct cpudata *cpudata, int pstate) if (limits->no_turbo && !limits->turbo_disabled) val |= (u64)1 << 32; - wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); + return val; } static int knl_get_turbo_pstate(void) @@ -753,7 +901,7 @@ static struct cpu_defaults core_params = { .get_min = core_get_min_pstate, .get_turbo = core_get_turbo_pstate, .get_scaling = core_get_scaling, - .set = core_set_pstate, + .get_val = core_get_val, .get_target_pstate = get_target_pstate_use_performance, }, }; @@ -772,7 +920,7 @@ static struct cpu_defaults silvermont_params = { .get_max_physical = atom_get_max_pstate, .get_min = atom_get_min_pstate, .get_turbo = atom_get_turbo_pstate, - .set = atom_set_pstate, + .get_val = atom_get_val, .get_scaling = silvermont_get_scaling, .get_vid = atom_get_vid, .get_target_pstate = get_target_pstate_use_cpu_load, @@ -793,7 +941,7 @@ static struct cpu_defaults airmont_params = { .get_max_physical = atom_get_max_pstate, .get_min = atom_get_min_pstate, .get_turbo = atom_get_turbo_pstate, - .set = atom_set_pstate, + .get_val = atom_get_val, .get_scaling = airmont_get_scaling, .get_vid = atom_get_vid, .get_target_pstate = get_target_pstate_use_cpu_load, @@ -815,7 +963,7 @@ static struct cpu_defaults knl_params = { .get_min = core_get_min_pstate, .get_turbo = knl_get_turbo_pstate, .get_scaling = core_get_scaling, - .set = core_set_pstate, + .get_val = core_get_val, .get_target_pstate = get_target_pstate_use_performance, }, }; @@ -834,33 +982,32 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) * policy, or by cpu specific default values determined through * experimentation. */ - max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits->max_perf)); + max_perf_adj = fp_toint(max_perf * limits->max_perf); *max = clamp_t(int, max_perf_adj, cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); - min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits->min_perf)); + min_perf = fp_toint(max_perf * limits->min_perf); *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); } -static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate, bool force) +static inline void intel_pstate_record_pstate(struct cpudata *cpu, int pstate) { - int max_perf, min_perf; - - if (force) { - update_turbo_state(); - - intel_pstate_get_min_max(cpu, &min_perf, &max_perf); - - pstate = clamp_t(int, pstate, min_perf, max_perf); - - if (pstate == cpu->pstate.current_pstate) - return; - } trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); - cpu->pstate.current_pstate = pstate; +} + +static void intel_pstate_set_min_pstate(struct cpudata *cpu) +{ + int pstate = cpu->pstate.min_pstate; - pstate_funcs.set(cpu, pstate); + intel_pstate_record_pstate(cpu, pstate); + /* + * Generally, there is no guarantee that this code will always run on + * the CPU being updated, so force the register update to run on the + * right CPU. + */ + wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL, + pstate_funcs.get_val(cpu, pstate)); } static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) @@ -873,7 +1020,8 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) if (pstate_funcs.get_vid) pstate_funcs.get_vid(cpu); - intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false); + + intel_pstate_set_min_pstate(cpu); } static inline void intel_pstate_calc_busy(struct cpudata *cpu) @@ -884,16 +1032,10 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu) core_pct = int_tofp(sample->aperf) * int_tofp(100); core_pct = div64_u64(core_pct, int_tofp(sample->mperf)); - sample->freq = fp_toint( - mul_fp(int_tofp( - cpu->pstate.max_pstate_physical * - cpu->pstate.scaling / 100), - core_pct)); - sample->core_pct_busy = (int32_t)core_pct; } -static inline void intel_pstate_sample(struct cpudata *cpu) +static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time) { u64 aperf, mperf; unsigned long flags; @@ -903,14 +1045,14 @@ static inline void intel_pstate_sample(struct cpudata *cpu) rdmsrl(MSR_IA32_APERF, aperf); rdmsrl(MSR_IA32_MPERF, mperf); tsc = rdtsc(); - if ((cpu->prev_mperf == mperf) || (cpu->prev_tsc == tsc)) { + if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) { local_irq_restore(flags); - return; + return false; } local_irq_restore(flags); cpu->last_sample_time = cpu->sample.time; - cpu->sample.time = ktime_get(); + cpu->sample.time = time; cpu->sample.aperf = aperf; cpu->sample.mperf = mperf; cpu->sample.tsc = tsc; @@ -918,27 +1060,24 @@ static inline void intel_pstate_sample(struct cpudata *cpu) cpu->sample.mperf -= cpu->prev_mperf; cpu->sample.tsc -= cpu->prev_tsc; - intel_pstate_calc_busy(cpu); - cpu->prev_aperf = aperf; cpu->prev_mperf = mperf; cpu->prev_tsc = tsc; + /* + * First time this function is invoked in a given cycle, all of the + * previous sample data fields are equal to zero or stale and they must + * be populated with meaningful numbers for things to work, so assume + * that sample.time will always be reset before setting the utilization + * update hook and make the caller skip the sample then. + */ + return !!cpu->last_sample_time; } -static inline void intel_hwp_set_sample_time(struct cpudata *cpu) -{ - int delay; - - delay = msecs_to_jiffies(50); - mod_timer_pinned(&cpu->timer, jiffies + delay); -} - -static inline void intel_pstate_set_sample_time(struct cpudata *cpu) +static inline int32_t get_avg_frequency(struct cpudata *cpu) { - int delay; - - delay = msecs_to_jiffies(pid_params.sample_rate_ms); - mod_timer_pinned(&cpu->timer, jiffies + delay); + return fp_toint(mul_fp(cpu->sample.core_pct_busy, + int_tofp(cpu->pstate.max_pstate_physical * + cpu->pstate.scaling / 100))); } static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) @@ -964,7 +1103,6 @@ static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) mperf = cpu->sample.mperf + delta_iowait_mperf; cpu->prev_cummulative_iowait = cummulative_iowait; - /* * The load can be estimated as the ratio of the mperf counter * running at a constant frequency during active periods @@ -980,8 +1118,7 @@ static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) { int32_t core_busy, max_pstate, current_pstate, sample_ratio; - s64 duration_us; - u32 sample_time; + u64 duration_ns; /* * core_busy is the ratio of actual performance to max @@ -1000,25 +1137,41 @@ static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); /* - * Since we have a deferred timer, it will not fire unless - * we are in C0. So, determine if the actual elapsed time - * is significantly greater (3x) than our sample interval. If it - * is, then we were idle for a long enough period of time - * to adjust our busyness. + * Since our utilization update callback will not run unless we are + * in C0, check if the actual elapsed time is significantly greater (3x) + * than our sample interval. If it is, then we were idle for a long + * enough period of time to adjust our busyness. */ - sample_time = pid_params.sample_rate_ms * USEC_PER_MSEC; - duration_us = ktime_us_delta(cpu->sample.time, - cpu->last_sample_time); - if (duration_us > sample_time * 3) { - sample_ratio = div_fp(int_tofp(sample_time), - int_tofp(duration_us)); + duration_ns = cpu->sample.time - cpu->last_sample_time; + if ((s64)duration_ns > pid_params.sample_rate_ns * 3) { + sample_ratio = div_fp(int_tofp(pid_params.sample_rate_ns), + int_tofp(duration_ns)); core_busy = mul_fp(core_busy, sample_ratio); + } else { + sample_ratio = div_fp(100 * cpu->sample.mperf, cpu->sample.tsc); + if (sample_ratio < int_tofp(1)) + core_busy = 0; } cpu->sample.busy_scaled = core_busy; return cpu->pstate.current_pstate - pid_calc(&cpu->pid, core_busy); } +static inline void intel_pstate_update_pstate(struct cpudata *cpu, int pstate) +{ + int max_perf, min_perf; + + update_turbo_state(); + + intel_pstate_get_min_max(cpu, &min_perf, &max_perf); + pstate = clamp_t(int, pstate, min_perf, max_perf); + if (pstate == cpu->pstate.current_pstate) + return; + + intel_pstate_record_pstate(cpu, pstate); + wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate)); +} + static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) { int from, target_pstate; @@ -1028,7 +1181,7 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) target_pstate = pstate_funcs.get_target_pstate(cpu); - intel_pstate_set_pstate(cpu, target_pstate, true); + intel_pstate_update_pstate(cpu, target_pstate); sample = &cpu->sample; trace_pstate_sample(fp_toint(sample->core_pct_busy), @@ -1038,26 +1191,24 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) sample->mperf, sample->aperf, sample->tsc, - sample->freq); -} - -static void intel_hwp_timer_func(unsigned long __data) -{ - struct cpudata *cpu = (struct cpudata *) __data; - - intel_pstate_sample(cpu); - intel_hwp_set_sample_time(cpu); + get_avg_frequency(cpu)); } -static void intel_pstate_timer_func(unsigned long __data) +static void intel_pstate_update_util(struct update_util_data *data, u64 time, + unsigned long util, unsigned long max) { - struct cpudata *cpu = (struct cpudata *) __data; - - intel_pstate_sample(cpu); + struct cpudata *cpu = container_of(data, struct cpudata, update_util); + u64 delta_ns = time - cpu->sample.time; - intel_pstate_adjust_busy_pstate(cpu); + if ((s64)delta_ns >= pid_params.sample_rate_ns) { + bool sample_taken = intel_pstate_sample(cpu, time); - intel_pstate_set_sample_time(cpu); + if (sample_taken) { + intel_pstate_calc_busy(cpu); + if (!hwp_active) + intel_pstate_adjust_busy_pstate(cpu); + } + } } #define ICPU(model, policy) \ @@ -1105,24 +1256,17 @@ static int intel_pstate_init_cpu(unsigned int cpunum) cpu->cpu = cpunum; - if (hwp_active) + if (hwp_active) { intel_pstate_hwp_enable(cpu); + pid_params.sample_rate_ms = 50; + pid_params.sample_rate_ns = 50 * NSEC_PER_MSEC; + } intel_pstate_get_cpu_pstates(cpu); - init_timer_deferrable(&cpu->timer); - cpu->timer.data = (unsigned long)cpu; - cpu->timer.expires = jiffies + HZ/100; - - if (!hwp_active) - cpu->timer.function = intel_pstate_timer_func; - else - cpu->timer.function = intel_hwp_timer_func; - intel_pstate_busy_pid_reset(cpu); - intel_pstate_sample(cpu); - add_timer_on(&cpu->timer, cpunum); + cpu->update_util.func = intel_pstate_update_util; pr_debug("intel_pstate: controlling: cpu %d\n", cpunum); @@ -1138,7 +1282,36 @@ static unsigned int intel_pstate_get(unsigned int cpu_num) if (!cpu) return 0; sample = &cpu->sample; - return sample->freq; + return get_avg_frequency(cpu); +} + +static void intel_pstate_set_update_util_hook(unsigned int cpu_num) +{ + struct cpudata *cpu = all_cpu_data[cpu_num]; + + /* Prevent intel_pstate_update_util() from using stale data. */ + cpu->sample.time = 0; + cpufreq_set_update_util_data(cpu_num, &cpu->update_util); +} + +static void intel_pstate_clear_update_util_hook(unsigned int cpu) +{ + cpufreq_set_update_util_data(cpu, NULL); + synchronize_sched(); +} + +static void intel_pstate_set_performance_limits(struct perf_limits *limits) +{ + limits->no_turbo = 0; + limits->turbo_disabled = 0; + limits->max_perf_pct = 100; + limits->max_perf = int_tofp(1); + limits->min_perf_pct = 100; + limits->min_perf = int_tofp(1); + limits->max_policy_pct = 100; + limits->max_sysfs_pct = 100; + limits->min_policy_pct = 0; + limits->min_sysfs_pct = 0; } static int intel_pstate_set_policy(struct cpufreq_policy *policy) @@ -1146,17 +1319,20 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy) if (!policy->cpuinfo.max_freq) return -ENODEV; - if (policy->policy == CPUFREQ_POLICY_PERFORMANCE && - policy->max >= policy->cpuinfo.max_freq) { - pr_debug("intel_pstate: set performance\n"); + intel_pstate_clear_update_util_hook(policy->cpu); + + if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) { limits = &performance_limits; - if (hwp_active) - intel_pstate_hwp_set(); - return 0; + if (policy->max >= policy->cpuinfo.max_freq) { + pr_debug("intel_pstate: set performance\n"); + intel_pstate_set_performance_limits(limits); + goto out; + } + } else { + pr_debug("intel_pstate: set powersave\n"); + limits = &powersave_limits; } - pr_debug("intel_pstate: set powersave\n"); - limits = &powersave_limits; limits->min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq; limits->min_policy_pct = clamp_t(int, limits->min_policy_pct, 0 , 100); limits->max_policy_pct = DIV_ROUND_UP(policy->max * 100, @@ -1182,8 +1358,10 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy) limits->max_perf = div_fp(int_tofp(limits->max_perf_pct), int_tofp(100)); - if (hwp_active) - intel_pstate_hwp_set(); + out: + intel_pstate_set_update_util_hook(policy->cpu); + + intel_pstate_hwp_set_policy(policy); return 0; } @@ -1206,11 +1384,12 @@ static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) pr_debug("intel_pstate: CPU %d exiting\n", cpu_num); - del_timer_sync(&all_cpu_data[cpu_num]->timer); + intel_pstate_clear_update_util_hook(cpu_num); + if (hwp_active) return; - intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false); + intel_pstate_set_min_pstate(cpu); } static int intel_pstate_cpu_init(struct cpufreq_policy *policy) @@ -1246,6 +1425,7 @@ static struct cpufreq_driver intel_pstate_driver = { .flags = CPUFREQ_CONST_LOOPS, .verify = intel_pstate_verify_policy, .setpolicy = intel_pstate_set_policy, + .resume = intel_pstate_hwp_set_policy, .get = intel_pstate_get, .init = intel_pstate_cpu_init, .stop_cpu = intel_pstate_stop_cpu, @@ -1270,6 +1450,7 @@ static int intel_pstate_msrs_not_valid(void) static void copy_pid_params(struct pstate_adjust_policy *policy) { pid_params.sample_rate_ms = policy->sample_rate_ms; + pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC; pid_params.p_gain_pct = policy->p_gain_pct; pid_params.i_gain_pct = policy->i_gain_pct; pid_params.d_gain_pct = policy->d_gain_pct; @@ -1284,7 +1465,7 @@ static void copy_cpu_funcs(struct pstate_funcs *funcs) pstate_funcs.get_min = funcs->get_min; pstate_funcs.get_turbo = funcs->get_turbo; pstate_funcs.get_scaling = funcs->get_scaling; - pstate_funcs.set = funcs->set; + pstate_funcs.get_val = funcs->get_val; pstate_funcs.get_vid = funcs->get_vid; pstate_funcs.get_target_pstate = funcs->get_target_pstate; @@ -1407,6 +1588,11 @@ static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } static inline bool intel_pstate_has_acpi_ppc(void) { return false; } #endif /* CONFIG_ACPI */ +static const struct x86_cpu_id hwp_support_ids[] __initconst = { + { X86_VENDOR_INTEL, 6, X86_MODEL_ANY, X86_FEATURE_HWP }, + {} +}; + static int __init intel_pstate_init(void) { int cpu, rc = 0; @@ -1416,17 +1602,16 @@ static int __init intel_pstate_init(void) if (no_load) return -ENODEV; + if (x86_match_cpu(hwp_support_ids) && !no_hwp) { + copy_cpu_funcs(&core_params.funcs); + hwp_active++; + goto hwp_cpu_matched; + } + id = x86_match_cpu(intel_pstate_cpu_ids); if (!id) return -ENODEV; - /* - * The Intel pstate driver will be ignored if the platform - * firmware has its own power management modes. - */ - if (intel_pstate_platform_pwr_mgmt_exists()) - return -ENODEV; - cpu_def = (struct cpu_defaults *)id->driver_data; copy_pid_params(&cpu_def->pid_policy); @@ -1435,17 +1620,20 @@ static int __init intel_pstate_init(void) if (intel_pstate_msrs_not_valid()) return -ENODEV; +hwp_cpu_matched: + /* + * The Intel pstate driver will be ignored if the platform + * firmware has its own power management modes. + */ + if (intel_pstate_platform_pwr_mgmt_exists()) + return -ENODEV; + pr_info("Intel P-state driver initializing.\n"); all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); if (!all_cpu_data) return -ENOMEM; - if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp) { - pr_info("intel_pstate: HWP enabled\n"); - hwp_active++; - } - if (!hwp_active && hwp_only) goto out; @@ -1456,12 +1644,15 @@ static int __init intel_pstate_init(void) intel_pstate_debug_expose_params(); intel_pstate_sysfs_expose_params(); + if (hwp_active) + pr_info("intel_pstate: HWP enabled\n"); + return rc; out: get_online_cpus(); for_each_online_cpu(cpu) { if (all_cpu_data[cpu]) { - del_timer_sync(&all_cpu_data[cpu]->timer); + intel_pstate_clear_update_util_hook(cpu); kfree(all_cpu_data[cpu]); } } diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index 547890fd9..39ac78c94 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -28,6 +28,8 @@ #include <linux/of.h> #include <linux/reboot.h> #include <linux/slab.h> +#include <linux/cpu.h> +#include <trace/events/power.h> #include <asm/cputhreads.h> #include <asm/firmware.h> @@ -43,15 +45,39 @@ static struct cpufreq_frequency_table powernv_freqs[POWERNV_MAX_PSTATES+1]; static bool rebooting, throttled, occ_reset; +static const char * const throttle_reason[] = { + "No throttling", + "Power Cap", + "Processor Over Temperature", + "Power Supply Failure", + "Over Current", + "OCC Reset" +}; + +enum throttle_reason_type { + NO_THROTTLE = 0, + POWERCAP, + CPU_OVERTEMP, + POWER_SUPPLY_FAILURE, + OVERCURRENT, + OCC_RESET_THROTTLE, + OCC_MAX_REASON +}; + static struct chip { unsigned int id; bool throttled; + bool restore; + u8 throttle_reason; cpumask_t mask; struct work_struct throttle; - bool restore; + int throttle_turbo; + int throttle_sub_turbo; + int reason[OCC_MAX_REASON]; } *chips; static int nr_chips; +static DEFINE_PER_CPU(struct chip *, chip_info); /* * Note: The set of pstates consists of contiguous integers, the @@ -183,6 +209,42 @@ static struct freq_attr *powernv_cpu_freq_attr[] = { NULL, }; +#define throttle_attr(name, member) \ +static ssize_t name##_show(struct cpufreq_policy *policy, char *buf) \ +{ \ + struct chip *chip = per_cpu(chip_info, policy->cpu); \ + \ + return sprintf(buf, "%u\n", chip->member); \ +} \ + \ +static struct freq_attr throttle_attr_##name = __ATTR_RO(name) \ + +throttle_attr(unthrottle, reason[NO_THROTTLE]); +throttle_attr(powercap, reason[POWERCAP]); +throttle_attr(overtemp, reason[CPU_OVERTEMP]); +throttle_attr(supply_fault, reason[POWER_SUPPLY_FAILURE]); +throttle_attr(overcurrent, reason[OVERCURRENT]); +throttle_attr(occ_reset, reason[OCC_RESET_THROTTLE]); +throttle_attr(turbo_stat, throttle_turbo); +throttle_attr(sub_turbo_stat, throttle_sub_turbo); + +static struct attribute *throttle_attrs[] = { + &throttle_attr_unthrottle.attr, + &throttle_attr_powercap.attr, + &throttle_attr_overtemp.attr, + &throttle_attr_supply_fault.attr, + &throttle_attr_overcurrent.attr, + &throttle_attr_occ_reset.attr, + &throttle_attr_turbo_stat.attr, + &throttle_attr_sub_turbo_stat.attr, + NULL, +}; + +static const struct attribute_group throttle_attr_grp = { + .name = "throttle_stats", + .attrs = throttle_attrs, +}; + /* Helper routines */ /* Access helpers to power mgt SPR */ @@ -311,34 +373,36 @@ static inline unsigned int get_nominal_index(void) static void powernv_cpufreq_throttle_check(void *data) { + struct chip *chip; unsigned int cpu = smp_processor_id(); unsigned long pmsr; - int pmsr_pmax, i; + int pmsr_pmax; pmsr = get_pmspr(SPRN_PMSR); - - for (i = 0; i < nr_chips; i++) - if (chips[i].id == cpu_to_chip_id(cpu)) - break; + chip = this_cpu_read(chip_info); /* Check for Pmax Capping */ pmsr_pmax = (s8)PMSR_MAX(pmsr); if (pmsr_pmax != powernv_pstate_info.max) { - if (chips[i].throttled) + if (chip->throttled) goto next; - chips[i].throttled = true; - if (pmsr_pmax < powernv_pstate_info.nominal) - pr_crit("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n", - cpu, chips[i].id, pmsr_pmax, - powernv_pstate_info.nominal); - else - pr_info("CPU %d on Chip %u has Pmax reduced below turbo frequency (%d < %d)\n", - cpu, chips[i].id, pmsr_pmax, - powernv_pstate_info.max); - } else if (chips[i].throttled) { - chips[i].throttled = false; - pr_info("CPU %d on Chip %u has Pmax restored to %d\n", cpu, - chips[i].id, pmsr_pmax); + chip->throttled = true; + if (pmsr_pmax < powernv_pstate_info.nominal) { + pr_warn_once("CPU %d on Chip %u has Pmax reduced below nominal frequency (%d < %d)\n", + cpu, chip->id, pmsr_pmax, + powernv_pstate_info.nominal); + chip->throttle_sub_turbo++; + } else { + chip->throttle_turbo++; + } + trace_powernv_throttle(chip->id, + throttle_reason[chip->throttle_reason], + pmsr_pmax); + } else if (chip->throttled) { + chip->throttled = false; + trace_powernv_throttle(chip->id, + throttle_reason[chip->throttle_reason], + pmsr_pmax); } /* Check if Psafe_mode_active is set in PMSR. */ @@ -356,7 +420,7 @@ next: if (throttled) { pr_info("PMSR = %16lx\n", pmsr); - pr_crit("CPU Frequency could be throttled\n"); + pr_warn("CPU Frequency could be throttled\n"); } } @@ -397,6 +461,21 @@ static int powernv_cpufreq_cpu_init(struct cpufreq_policy *policy) for (i = 0; i < threads_per_core; i++) cpumask_set_cpu(base + i, policy->cpus); + if (!policy->driver_data) { + int ret; + + ret = sysfs_create_group(&policy->kobj, &throttle_attr_grp); + if (ret) { + pr_info("Failed to create throttle stats directory for cpu %d\n", + policy->cpu); + return ret; + } + /* + * policy->driver_data is used as a flag for one-time + * creation of throttle sysfs files. + */ + policy->driver_data = policy; + } return cpufreq_table_validate_and_show(policy, powernv_freqs); } @@ -423,18 +502,19 @@ void powernv_cpufreq_work_fn(struct work_struct *work) { struct chip *chip = container_of(work, struct chip, throttle); unsigned int cpu; - cpumask_var_t mask; + cpumask_t mask; - smp_call_function_any(&chip->mask, + get_online_cpus(); + cpumask_and(&mask, &chip->mask, cpu_online_mask); + smp_call_function_any(&mask, powernv_cpufreq_throttle_check, NULL, 0); if (!chip->restore) - return; + goto out; chip->restore = false; - cpumask_copy(mask, &chip->mask); - for_each_cpu_and(cpu, mask, cpu_online_mask) { - int index, tcpu; + for_each_cpu(cpu, &mask) { + int index; struct cpufreq_policy policy; cpufreq_get_policy(&policy, cpu); @@ -442,20 +522,12 @@ void powernv_cpufreq_work_fn(struct work_struct *work) policy.cur, CPUFREQ_RELATION_C, &index); powernv_cpufreq_target_index(&policy, index); - for_each_cpu(tcpu, policy.cpus) - cpumask_clear_cpu(tcpu, mask); + cpumask_andnot(&mask, &mask, policy.cpus); } +out: + put_online_cpus(); } -static char throttle_reason[][30] = { - "No throttling", - "Power Cap", - "Processor Over Temperature", - "Power Supply Failure", - "Over Current", - "OCC Reset" - }; - static int powernv_cpufreq_occ_msg(struct notifier_block *nb, unsigned long msg_type, void *_msg) { @@ -481,7 +553,7 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb, */ if (!throttled) { throttled = true; - pr_crit("CPU frequency is throttled for duration\n"); + pr_warn("CPU frequency is throttled for duration\n"); } break; @@ -505,23 +577,20 @@ static int powernv_cpufreq_occ_msg(struct notifier_block *nb, return 0; } - if (omsg.throttle_status && - omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS) - pr_info("OCC: Chip %u Pmax reduced due to %s\n", - (unsigned int)omsg.chip, - throttle_reason[omsg.throttle_status]); - else if (!omsg.throttle_status) - pr_info("OCC: Chip %u %s\n", (unsigned int)omsg.chip, - throttle_reason[omsg.throttle_status]); - else - return 0; - for (i = 0; i < nr_chips; i++) - if (chips[i].id == omsg.chip) { - if (!omsg.throttle_status) - chips[i].restore = true; - schedule_work(&chips[i].throttle); - } + if (chips[i].id == omsg.chip) + break; + + if (omsg.throttle_status >= 0 && + omsg.throttle_status <= OCC_MAX_THROTTLE_STATUS) { + chips[i].throttle_reason = omsg.throttle_status; + chips[i].reason[omsg.throttle_status]++; + } + + if (!omsg.throttle_status) + chips[i].restore = true; + + schedule_work(&chips[i].throttle); } return 0; } @@ -566,21 +635,33 @@ static int init_chip_info(void) } } - chips = kmalloc_array(nr_chips, sizeof(struct chip), GFP_KERNEL); + chips = kcalloc(nr_chips, sizeof(struct chip), GFP_KERNEL); if (!chips) return -ENOMEM; for (i = 0; i < nr_chips; i++) { chips[i].id = chip[i]; - chips[i].throttled = false; cpumask_copy(&chips[i].mask, cpumask_of_node(chip[i])); INIT_WORK(&chips[i].throttle, powernv_cpufreq_work_fn); - chips[i].restore = false; + for_each_cpu(cpu, &chips[i].mask) + per_cpu(chip_info, cpu) = &chips[i]; } return 0; } +static inline void clean_chip_info(void) +{ + kfree(chips); +} + +static inline void unregister_all_notifiers(void) +{ + opal_message_notifier_unregister(OPAL_MSG_OCC, + &powernv_cpufreq_opal_nb); + unregister_reboot_notifier(&powernv_cpufreq_reboot_nb); +} + static int __init powernv_cpufreq_init(void) { int rc = 0; @@ -591,28 +672,35 @@ static int __init powernv_cpufreq_init(void) /* Discover pstates from device tree and init */ rc = init_powernv_pstates(); - if (rc) { - pr_info("powernv-cpufreq disabled. System does not support PState control\n"); - return rc; - } + if (rc) + goto out; /* Populate chip info */ rc = init_chip_info(); if (rc) - return rc; + goto out; register_reboot_notifier(&powernv_cpufreq_reboot_nb); opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb); - return cpufreq_register_driver(&powernv_cpufreq_driver); + + rc = cpufreq_register_driver(&powernv_cpufreq_driver); + if (!rc) + return 0; + + pr_info("Failed to register the cpufreq driver (%d)\n", rc); + unregister_all_notifiers(); + clean_chip_info(); +out: + pr_info("Platform driver disabled. System does not support PState control\n"); + return rc; } module_init(powernv_cpufreq_init); static void __exit powernv_cpufreq_exit(void) { - unregister_reboot_notifier(&powernv_cpufreq_reboot_nb); - opal_message_notifier_unregister(OPAL_MSG_OCC, - &powernv_cpufreq_opal_nb); cpufreq_unregister_driver(&powernv_cpufreq_driver); + unregister_all_notifiers(); + clean_chip_info(); } module_exit(powernv_cpufreq_exit); diff --git a/drivers/cpufreq/pxa2xx-cpufreq.c b/drivers/cpufreq/pxa2xx-cpufreq.c index 096377232..46fee1539 100644 --- a/drivers/cpufreq/pxa2xx-cpufreq.c +++ b/drivers/cpufreq/pxa2xx-cpufreq.c @@ -319,7 +319,7 @@ static int pxa_set_target(struct cpufreq_policy *policy, unsigned int idx) local_irq_save(flags); /* Set new the CCCR and prepare CCLKCFG */ - CCCR = pxa_freq_settings[idx].cccr; + writel(pxa_freq_settings[idx].cccr, CCCR); cclkcfg = pxa_freq_settings[idx].cclkcfg; asm volatile(" \n\ diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c index 051a8a822..a145b319d 100644 --- a/drivers/cpufreq/s5pv210-cpufreq.c +++ b/drivers/cpufreq/s5pv210-cpufreq.c @@ -576,10 +576,8 @@ static struct cpufreq_driver s5pv210_driver = { .get = cpufreq_generic_get, .init = s5pv210_cpu_init, .name = "s5pv210", -#ifdef CONFIG_PM .suspend = cpufreq_generic_suspend, .resume = cpufreq_generic_suspend, /* We need to set SLEEP FREQ again */ -#endif }; static struct notifier_block s5pv210_cpufreq_reboot_notifier = { |