| Message ID | 20210624115813.3613290-4-thara.gopinath@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Introduce LMh driver for Qualcomm SoCs | expand |
On 24-06-21, 07:58, Thara Gopinath wrote: > Add interrupt support to notify the kernel of h/w initiated frequency > throttling by LMh. Convey this to scheduler via thermal presssure > interface. > > Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> > --- > > v1->v2: > - Introduced qcom_cpufreq_hw_lmh_init to consolidate LMh related initializations > as per Viresh's review comment. > - Moved the piece of code restarting polling/re-enabling LMh interrupt to > qcom_lmh_dcvs_notify therby simplifying isr and timer callback as per Viresh's > suggestion. > - Droped cpus from qcom_cpufreq_data and instead using cpus from cpufreq_policy in > qcom_lmh_dcvs_notify as per Viresh's review comment. > - Dropped dt property qcom,support-lmh as per Bjorn's suggestion. > - Other minor/cosmetic fixes > > drivers/cpufreq/qcom-cpufreq-hw.c | 103 ++++++++++++++++++++++++++++++ > 1 file changed, 103 insertions(+) > > diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c > index f86859bf76f1..241f6f2b441f 100644 > --- a/drivers/cpufreq/qcom-cpufreq-hw.c > +++ b/drivers/cpufreq/qcom-cpufreq-hw.c > @@ -13,6 +13,7 @@ > #include <linux/of_platform.h> > #include <linux/pm_opp.h> > #include <linux/slab.h> > +#include <linux/interrupt.h> Please don't break the alphabetical order here. > #define LUT_MAX_ENTRIES 40U > #define LUT_SRC GENMASK(31, 30) > @@ -22,10 +23,13 @@ > #define CLK_HW_DIV 2 > #define LUT_TURBO_IND 1 > > +#define HZ_PER_KHZ 1000 > > struct qcom_cpufreq_soc_data { > u32 reg_enable; > u32 reg_freq_lut; > u32 reg_volt_lut; > + u32 reg_current_vote; > u32 reg_perf_state; > u8 lut_row_size; > }; > @@ -33,7 +37,10 @@ struct qcom_cpufreq_soc_data { > struct qcom_cpufreq_data { > void __iomem *base; > struct resource *res; > + struct delayed_work lmh_dcvs_poll_work; > const struct qcom_cpufreq_soc_data *soc_data; > + struct cpufreq_policy *policy; > + int lmh_dcvs_irq; > }; > > static unsigned long cpu_hw_rate, xo_rate; > @@ -251,10 +258,79 @@ static void qcom_get_related_cpus(int index, struct cpumask *m) > } > } > > +static inline unsigned long qcom_lmh_vote_to_freq(u32 val) > +{ > + return (val & 0x3FF) * 19200; > +} > + > +static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) > +{ > + struct cpufreq_policy *policy = data->policy; > + struct dev_pm_opp *opp; > + struct device *dev; > + unsigned long max_capacity, capacity, freq_hz, throttled_freq; > + unsigned int val, freq; > + > + /* > + * Get the h/w throttled frequency, normalize it using the > + * registered opp table and use it to calculate thermal pressure. > + */ > + val = readl_relaxed(data->base + data->soc_data->reg_current_vote); > + freq = qcom_lmh_vote_to_freq(val); > + freq_hz = freq * HZ_PER_KHZ; > + > + dev = get_cpu_device(cpumask_first(policy->cpus)); > + opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); > + if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) > + opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz); > + > + throttled_freq = freq_hz / HZ_PER_KHZ; > + > + /* Update thermal pressure */ > + max_capacity = arch_scale_cpu_capacity(cpumask_first(policy->cpus)); > + capacity = throttled_freq * max_capacity; > + capacity /= policy->cpuinfo.max_freq; > + /* Don't pass boost capacity to scheduler */ > + if (capacity > max_capacity) > + capacity = max_capacity; I wonder why this check isn't present for cpufreq_cooling.c . > + arch_set_thermal_pressure(policy->cpus, max_capacity - capacity); > + /* Whenever you mix code and comments, please separate them with a blank line, else it becomes a bit messy and harder to read. > + * If h/w throttled frequency is higher than what cpufreq has requested for, stop > + * polling and switch back to interrupt mechanism > + */ > + if (throttled_freq >= qcom_cpufreq_hw_get(cpumask_first(policy->cpus))) > + /* Clear the existing interrupts and enable it back */ > + enable_irq(data->lmh_dcvs_irq); > + else > + mod_delayed_work(system_highpri_wq, &data->lmh_dcvs_poll_work, > + msecs_to_jiffies(10)); > +} > + > +static void qcom_lmh_dcvs_poll(struct work_struct *work) > +{ > + struct qcom_cpufreq_data *data; > + > + data = container_of(work, struct qcom_cpufreq_data, lmh_dcvs_poll_work.work); > + > + qcom_lmh_dcvs_notify(data); > +} > + > +static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data) > +{ > + struct qcom_cpufreq_data *c_data = data; > + > + /* Disable interrupt and enable polling */ > + disable_irq_nosync(c_data->lmh_dcvs_irq); > + qcom_lmh_dcvs_notify(c_data); > + > + return 0; > +} > + > static const struct qcom_cpufreq_soc_data qcom_soc_data = { > .reg_enable = 0x0, > .reg_freq_lut = 0x110, > .reg_volt_lut = 0x114, > + .reg_current_vote = 0x704, > .reg_perf_state = 0x920, > .lut_row_size = 32, > }; > @@ -274,6 +350,23 @@ static const struct of_device_id qcom_cpufreq_hw_match[] = { > }; > MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); > > +static void qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy) > +{ > + struct qcom_cpufreq_data *data = policy->driver_data; > + struct platform_device *pdev = cpufreq_get_driver_data(); > + struct device *dev = &pdev->dev; > + int ret; > + > + ret = devm_request_irq(dev, data->lmh_dcvs_irq, qcom_lmh_dcvs_handle_irq, > + 0, "dcvsh-irq", data); > + if (ret) { > + dev_err(dev, "Error %d registering irq %x\n", ret, data->lmh_dcvs_irq); > + return; > + } > + data->policy = policy; > + INIT_DEFERRABLE_WORK(&data->lmh_dcvs_poll_work, qcom_lmh_dcvs_poll); > +} > + > static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) > { > struct platform_device *pdev = cpufreq_get_driver_data(); > @@ -370,6 +463,16 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) > dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); > } > > + /* Look for LMh interrupt. If no interrupt line is specified / > + * if there is an error, allow cpufreq to be enabled as usual. > + */ Proper comment style please.. > + data->lmh_dcvs_irq = platform_get_irq(pdev, index); > + if (data->lmh_dcvs_irq > 0) { > + qcom_cpufreq_hw_lmh_init(policy); > + } else if (data->lmh_dcvs_irq != -ENXIO) { > + ret = data->lmh_dcvs_irq; > + goto error; > + } Move all of this to qcom_cpufreq_hw_lmh_init(). And I don't see any cleanup for this stuff. There is no guarantee that the irq won't fire and queue up a work right after cpufreq driver is unregistered and before the devm_ stuff gets released. > return 0; > error: > kfree(data); > -- > 2.25.1
On 6/24/2021 5:28 PM, Thara Gopinath wrote: > Add interrupt support to notify the kernel of h/w initiated frequency > throttling by LMh. Convey this to scheduler via thermal presssure > interface. > > Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> > --- > > v1->v2: > - Introduced qcom_cpufreq_hw_lmh_init to consolidate LMh related initializations > as per Viresh's review comment. > - Moved the piece of code restarting polling/re-enabling LMh interrupt to > qcom_lmh_dcvs_notify therby simplifying isr and timer callback as per Viresh's > suggestion. > - Droped cpus from qcom_cpufreq_data and instead using cpus from cpufreq_policy in > qcom_lmh_dcvs_notify as per Viresh's review comment. > - Dropped dt property qcom,support-lmh as per Bjorn's suggestion. > - Other minor/cosmetic fixes > > drivers/cpufreq/qcom-cpufreq-hw.c | 103 ++++++++++++++++++++++++++++++ > 1 file changed, 103 insertions(+) > > diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c > index f86859bf76f1..241f6f2b441f 100644 > --- a/drivers/cpufreq/qcom-cpufreq-hw.c > +++ b/drivers/cpufreq/qcom-cpufreq-hw.c > @@ -13,6 +13,7 @@ > #include <linux/of_platform.h> > #include <linux/pm_opp.h> > #include <linux/slab.h> > +#include <linux/interrupt.h> > > #define LUT_MAX_ENTRIES 40U > #define LUT_SRC GENMASK(31, 30) > @@ -22,10 +23,13 @@ > #define CLK_HW_DIV 2 > #define LUT_TURBO_IND 1 > > +#define HZ_PER_KHZ 1000 > + > struct qcom_cpufreq_soc_data { > u32 reg_enable; > u32 reg_freq_lut; > u32 reg_volt_lut; > + u32 reg_current_vote; > u32 reg_perf_state; > u8 lut_row_size; > }; > @@ -33,7 +37,10 @@ struct qcom_cpufreq_soc_data { > struct qcom_cpufreq_data { > void __iomem *base; > struct resource *res; > + struct delayed_work lmh_dcvs_poll_work; > const struct qcom_cpufreq_soc_data *soc_data; > + struct cpufreq_policy *policy; > + int lmh_dcvs_irq; > }; > > static unsigned long cpu_hw_rate, xo_rate; > @@ -251,10 +258,79 @@ static void qcom_get_related_cpus(int index, struct cpumask *m) > } > } > > +static inline unsigned long qcom_lmh_vote_to_freq(u32 val) > +{ > + return (val & 0x3FF) * 19200; > +} > + > +static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) > +{ > + struct cpufreq_policy *policy = data->policy; > + struct dev_pm_opp *opp; > + struct device *dev; > + unsigned long max_capacity, capacity, freq_hz, throttled_freq; > + unsigned int val, freq; > + > + /* > + * Get the h/w throttled frequency, normalize it using the > + * registered opp table and use it to calculate thermal pressure. > + */ > + val = readl_relaxed(data->base + data->soc_data->reg_current_vote); > + freq = qcom_lmh_vote_to_freq(val); > + freq_hz = freq * HZ_PER_KHZ; > + > + dev = get_cpu_device(cpumask_first(policy->cpus)); > + opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); > + if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) > + opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz); > + > + throttled_freq = freq_hz / HZ_PER_KHZ; > + > + /* Update thermal pressure */ > + max_capacity = arch_scale_cpu_capacity(cpumask_first(policy->cpus)); > + capacity = throttled_freq * max_capacity; > + capacity /= policy->cpuinfo.max_freq; > + /* Don't pass boost capacity to scheduler */ > + if (capacity > max_capacity) > + capacity = max_capacity; > + arch_set_thermal_pressure(policy->cpus, max_capacity - capacity); > + /* > + * If h/w throttled frequency is higher than what cpufreq has requested for, stop > + * polling and switch back to interrupt mechanism > + */ > + if (throttled_freq >= qcom_cpufreq_hw_get(cpumask_first(policy->cpus))) > + /* Clear the existing interrupts and enable it back */ > + enable_irq(data->lmh_dcvs_irq); > + else > + mod_delayed_work(system_highpri_wq, &data->lmh_dcvs_poll_work, > + msecs_to_jiffies(10)); > +} > + > +static void qcom_lmh_dcvs_poll(struct work_struct *work) > +{ > + struct qcom_cpufreq_data *data; > + > + data = container_of(work, struct qcom_cpufreq_data, lmh_dcvs_poll_work.work); > + > + qcom_lmh_dcvs_notify(data); > +} > + > +static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data) > +{ > + struct qcom_cpufreq_data *c_data = data; > + > + /* Disable interrupt and enable polling */ > + disable_irq_nosync(c_data->lmh_dcvs_irq); > + qcom_lmh_dcvs_notify(c_data); > + > + return 0; > +} > + > static const struct qcom_cpufreq_soc_data qcom_soc_data = { > .reg_enable = 0x0, > .reg_freq_lut = 0x110, > .reg_volt_lut = 0x114, > + .reg_current_vote = 0x704, > .reg_perf_state = 0x920, > .lut_row_size = 32, > }; > @@ -274,6 +350,23 @@ static const struct of_device_id qcom_cpufreq_hw_match[] = { > }; > MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); > > +static void qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy) > +{ > + struct qcom_cpufreq_data *data = policy->driver_data; > + struct platform_device *pdev = cpufreq_get_driver_data(); > + struct device *dev = &pdev->dev; > + int ret; > + > + ret = devm_request_irq(dev, data->lmh_dcvs_irq, qcom_lmh_dcvs_handle_irq, > + 0, "dcvsh-irq", data); It is better if you tag the CPU id while registering the IRQ. "dcvsh-irq-x" (0/4/7) > + if (ret) { > + dev_err(dev, "Error %d registering irq %x\n", ret, data->lmh_dcvs_irq); > + return; > + } > + data->policy = policy; > + INIT_DEFERRABLE_WORK(&data->lmh_dcvs_poll_work, qcom_lmh_dcvs_poll); > +} > + > static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) > { > struct platform_device *pdev = cpufreq_get_driver_data(); > @@ -370,6 +463,16 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) > dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); > } > > + /* Look for LMh interrupt. If no interrupt line is specified / > + * if there is an error, allow cpufreq to be enabled as usual. > + */ > + data->lmh_dcvs_irq = platform_get_irq(pdev, index); > + if (data->lmh_dcvs_irq > 0) { > + qcom_cpufreq_hw_lmh_init(policy); > + } else if (data->lmh_dcvs_irq != -ENXIO) { > + ret = data->lmh_dcvs_irq; > + goto error; > + } > return 0; > error: > kfree(data); >
On 6/28/21 10:35 PM, Viresh Kumar wrote: > On 24-06-21, 07:58, Thara Gopinath wrote: >> Add interrupt support to notify the kernel of h/w initiated frequency >> throttling by LMh. Convey this to scheduler via thermal presssure >> interface. >> >> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> >> --- >> >> v1->v2: >> - Introduced qcom_cpufreq_hw_lmh_init to consolidate LMh related initializations >> as per Viresh's review comment. >> - Moved the piece of code restarting polling/re-enabling LMh interrupt to >> qcom_lmh_dcvs_notify therby simplifying isr and timer callback as per Viresh's >> suggestion. >> - Droped cpus from qcom_cpufreq_data and instead using cpus from cpufreq_policy in >> qcom_lmh_dcvs_notify as per Viresh's review comment. >> - Dropped dt property qcom,support-lmh as per Bjorn's suggestion. >> - Other minor/cosmetic fixes >> >> drivers/cpufreq/qcom-cpufreq-hw.c | 103 ++++++++++++++++++++++++++++++ >> 1 file changed, 103 insertions(+) >> >> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c >> index f86859bf76f1..241f6f2b441f 100644 >> --- a/drivers/cpufreq/qcom-cpufreq-hw.c >> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c >> @@ -13,6 +13,7 @@ >> #include <linux/of_platform.h> >> #include <linux/pm_opp.h> >> #include <linux/slab.h> >> +#include <linux/interrupt.h> > > Please don't break the alphabetical order here. > >> #define LUT_MAX_ENTRIES 40U >> #define LUT_SRC GENMASK(31, 30) >> @@ -22,10 +23,13 @@ >> #define CLK_HW_DIV 2 >> #define LUT_TURBO_IND 1 >> >> +#define HZ_PER_KHZ 1000 >> >> struct qcom_cpufreq_soc_data { >> u32 reg_enable; >> u32 reg_freq_lut; >> u32 reg_volt_lut; >> + u32 reg_current_vote; >> u32 reg_perf_state; >> u8 lut_row_size; >> }; >> @@ -33,7 +37,10 @@ struct qcom_cpufreq_soc_data { >> struct qcom_cpufreq_data { >> void __iomem *base; >> struct resource *res; >> + struct delayed_work lmh_dcvs_poll_work; >> const struct qcom_cpufreq_soc_data *soc_data; >> + struct cpufreq_policy *policy; >> + int lmh_dcvs_irq; >> }; >> >> static unsigned long cpu_hw_rate, xo_rate; >> @@ -251,10 +258,79 @@ static void qcom_get_related_cpus(int index, struct cpumask *m) >> } >> } >> >> +static inline unsigned long qcom_lmh_vote_to_freq(u32 val) >> +{ >> + return (val & 0x3FF) * 19200; >> +} >> + >> +static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) >> +{ >> + struct cpufreq_policy *policy = data->policy; >> + struct dev_pm_opp *opp; >> + struct device *dev; >> + unsigned long max_capacity, capacity, freq_hz, throttled_freq; >> + unsigned int val, freq; >> + >> + /* >> + * Get the h/w throttled frequency, normalize it using the >> + * registered opp table and use it to calculate thermal pressure. >> + */ >> + val = readl_relaxed(data->base + data->soc_data->reg_current_vote); >> + freq = qcom_lmh_vote_to_freq(val); >> + freq_hz = freq * HZ_PER_KHZ; >> + >> + dev = get_cpu_device(cpumask_first(policy->cpus)); >> + opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); >> + if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) >> + opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz); >> + >> + throttled_freq = freq_hz / HZ_PER_KHZ; >> + >> + /* Update thermal pressure */ >> + max_capacity = arch_scale_cpu_capacity(cpumask_first(policy->cpus)); >> + capacity = throttled_freq * max_capacity; >> + capacity /= policy->cpuinfo.max_freq; >> + /* Don't pass boost capacity to scheduler */ >> + if (capacity > max_capacity) >> + capacity = max_capacity; > > I wonder why this check isn't present for cpufreq_cooling.c . Hi Viresh, I don't think cpufreq_cooling recognizes boost frequencies. The max state there is the max of nominal frequencies , right? If not, it might be a good idea to add this check there as well. I will fix rest of your comments in v3.
On 6/28/21 10:50 PM, Taniya Das wrote: > > > On 6/24/2021 5:28 PM, Thara Gopinath wrote: >> Add interrupt support to notify the kernel of h/w initiated frequency >> throttling by LMh. Convey this to scheduler via thermal presssure >> interface. >> >> Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> >> --- >> >> v1->v2: >> - Introduced qcom_cpufreq_hw_lmh_init to consolidate LMh related >> initializations >> as per Viresh's review comment. >> - Moved the piece of code restarting polling/re-enabling LMh >> interrupt to >> qcom_lmh_dcvs_notify therby simplifying isr and timer callback >> as per Viresh's >> suggestion. >> - Droped cpus from qcom_cpufreq_data and instead using cpus from >> cpufreq_policy in >> qcom_lmh_dcvs_notify as per Viresh's review comment. >> - Dropped dt property qcom,support-lmh as per Bjorn's suggestion. >> - Other minor/cosmetic fixes >> >> drivers/cpufreq/qcom-cpufreq-hw.c | 103 ++++++++++++++++++++++++++++++ >> 1 file changed, 103 insertions(+) >> >> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c >> b/drivers/cpufreq/qcom-cpufreq-hw.c >> index f86859bf76f1..241f6f2b441f 100644 >> --- a/drivers/cpufreq/qcom-cpufreq-hw.c >> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c [snip] >> static const struct qcom_cpufreq_soc_data qcom_soc_data = { >> .reg_enable = 0x0, >> .reg_freq_lut = 0x110, >> .reg_volt_lut = 0x114, >> + .reg_current_vote = 0x704, >> .reg_perf_state = 0x920, >> .lut_row_size = 32, >> }; >> @@ -274,6 +350,23 @@ static const struct of_device_id >> qcom_cpufreq_hw_match[] = { >> }; >> MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); >> +static void qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy) >> +{ >> + struct qcom_cpufreq_data *data = policy->driver_data; >> + struct platform_device *pdev = cpufreq_get_driver_data(); >> + struct device *dev = &pdev->dev; >> + int ret; >> + >> + ret = devm_request_irq(dev, data->lmh_dcvs_irq, >> qcom_lmh_dcvs_handle_irq, >> + 0, "dcvsh-irq", data); > > > It is better if you tag the CPU id while registering the IRQ. > "dcvsh-irq-x" (0/4/7) Sure. Will fix it. > >> + if (ret) { >> + dev_err(dev, "Error %d registering irq %x\n", ret, >> data->lmh_dcvs_irq); >> + return; >> + } >> + data->policy = policy; >> + INIT_DEFERRABLE_WORK(&data->lmh_dcvs_poll_work, qcom_lmh_dcvs_poll); >> +} >> + >> static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) >> { >> struct platform_device *pdev = cpufreq_get_driver_data(); >> @@ -370,6 +463,16 @@ static int qcom_cpufreq_hw_cpu_init(struct >> cpufreq_policy *policy) >> dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); >> } >> + /* Look for LMh interrupt. If no interrupt line is specified / >> + * if there is an error, allow cpufreq to be enabled as usual. >> + */ >> + data->lmh_dcvs_irq = platform_get_irq(pdev, index); >> + if (data->lmh_dcvs_irq > 0) { >> + qcom_cpufreq_hw_lmh_init(policy); >> + } else if (data->lmh_dcvs_irq != -ENXIO) { >> + ret = data->lmh_dcvs_irq; >> + goto error; >> + } >> return 0; >> error: >> kfree(data); >> >
On 29-06-21, 22:25, Thara Gopinath wrote: > I don't think cpufreq_cooling recognizes boost frequencies. The max state > there is the max of nominal frequencies , right? If not, it might be a good > idea to add this check there as well. Ahh, that explains it.
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index f86859bf76f1..241f6f2b441f 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -13,6 +13,7 @@ #include <linux/of_platform.h> #include <linux/pm_opp.h> #include <linux/slab.h> +#include <linux/interrupt.h> #define LUT_MAX_ENTRIES 40U #define LUT_SRC GENMASK(31, 30) @@ -22,10 +23,13 @@ #define CLK_HW_DIV 2 #define LUT_TURBO_IND 1 +#define HZ_PER_KHZ 1000 + struct qcom_cpufreq_soc_data { u32 reg_enable; u32 reg_freq_lut; u32 reg_volt_lut; + u32 reg_current_vote; u32 reg_perf_state; u8 lut_row_size; }; @@ -33,7 +37,10 @@ struct qcom_cpufreq_soc_data { struct qcom_cpufreq_data { void __iomem *base; struct resource *res; + struct delayed_work lmh_dcvs_poll_work; const struct qcom_cpufreq_soc_data *soc_data; + struct cpufreq_policy *policy; + int lmh_dcvs_irq; }; static unsigned long cpu_hw_rate, xo_rate; @@ -251,10 +258,79 @@ static void qcom_get_related_cpus(int index, struct cpumask *m) } } +static inline unsigned long qcom_lmh_vote_to_freq(u32 val) +{ + return (val & 0x3FF) * 19200; +} + +static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) +{ + struct cpufreq_policy *policy = data->policy; + struct dev_pm_opp *opp; + struct device *dev; + unsigned long max_capacity, capacity, freq_hz, throttled_freq; + unsigned int val, freq; + + /* + * Get the h/w throttled frequency, normalize it using the + * registered opp table and use it to calculate thermal pressure. + */ + val = readl_relaxed(data->base + data->soc_data->reg_current_vote); + freq = qcom_lmh_vote_to_freq(val); + freq_hz = freq * HZ_PER_KHZ; + + dev = get_cpu_device(cpumask_first(policy->cpus)); + opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); + if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) + opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz); + + throttled_freq = freq_hz / HZ_PER_KHZ; + + /* Update thermal pressure */ + max_capacity = arch_scale_cpu_capacity(cpumask_first(policy->cpus)); + capacity = throttled_freq * max_capacity; + capacity /= policy->cpuinfo.max_freq; + /* Don't pass boost capacity to scheduler */ + if (capacity > max_capacity) + capacity = max_capacity; + arch_set_thermal_pressure(policy->cpus, max_capacity - capacity); + /* + * If h/w throttled frequency is higher than what cpufreq has requested for, stop + * polling and switch back to interrupt mechanism + */ + if (throttled_freq >= qcom_cpufreq_hw_get(cpumask_first(policy->cpus))) + /* Clear the existing interrupts and enable it back */ + enable_irq(data->lmh_dcvs_irq); + else + mod_delayed_work(system_highpri_wq, &data->lmh_dcvs_poll_work, + msecs_to_jiffies(10)); +} + +static void qcom_lmh_dcvs_poll(struct work_struct *work) +{ + struct qcom_cpufreq_data *data; + + data = container_of(work, struct qcom_cpufreq_data, lmh_dcvs_poll_work.work); + + qcom_lmh_dcvs_notify(data); +} + +static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data) +{ + struct qcom_cpufreq_data *c_data = data; + + /* Disable interrupt and enable polling */ + disable_irq_nosync(c_data->lmh_dcvs_irq); + qcom_lmh_dcvs_notify(c_data); + + return 0; +} + static const struct qcom_cpufreq_soc_data qcom_soc_data = { .reg_enable = 0x0, .reg_freq_lut = 0x110, .reg_volt_lut = 0x114, + .reg_current_vote = 0x704, .reg_perf_state = 0x920, .lut_row_size = 32, }; @@ -274,6 +350,23 @@ static const struct of_device_id qcom_cpufreq_hw_match[] = { }; MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); +static void qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy) +{ + struct qcom_cpufreq_data *data = policy->driver_data; + struct platform_device *pdev = cpufreq_get_driver_data(); + struct device *dev = &pdev->dev; + int ret; + + ret = devm_request_irq(dev, data->lmh_dcvs_irq, qcom_lmh_dcvs_handle_irq, + 0, "dcvsh-irq", data); + if (ret) { + dev_err(dev, "Error %d registering irq %x\n", ret, data->lmh_dcvs_irq); + return; + } + data->policy = policy; + INIT_DEFERRABLE_WORK(&data->lmh_dcvs_poll_work, qcom_lmh_dcvs_poll); +} + static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) { struct platform_device *pdev = cpufreq_get_driver_data(); @@ -370,6 +463,16 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); } + /* Look for LMh interrupt. If no interrupt line is specified / + * if there is an error, allow cpufreq to be enabled as usual. + */ + data->lmh_dcvs_irq = platform_get_irq(pdev, index); + if (data->lmh_dcvs_irq > 0) { + qcom_cpufreq_hw_lmh_init(policy); + } else if (data->lmh_dcvs_irq != -ENXIO) { + ret = data->lmh_dcvs_irq; + goto error; + } return 0; error: kfree(data);
Add interrupt support to notify the kernel of h/w initiated frequency throttling by LMh. Convey this to scheduler via thermal presssure interface. Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> --- v1->v2: - Introduced qcom_cpufreq_hw_lmh_init to consolidate LMh related initializations as per Viresh's review comment. - Moved the piece of code restarting polling/re-enabling LMh interrupt to qcom_lmh_dcvs_notify therby simplifying isr and timer callback as per Viresh's suggestion. - Droped cpus from qcom_cpufreq_data and instead using cpus from cpufreq_policy in qcom_lmh_dcvs_notify as per Viresh's review comment. - Dropped dt property qcom,support-lmh as per Bjorn's suggestion. - Other minor/cosmetic fixes drivers/cpufreq/qcom-cpufreq-hw.c | 103 ++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+)