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@xxxxxxxxxx> --- drivers/cpufreq/qcom-cpufreq-hw.c | 100 ++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index f86859bf76f1..95e17330aa9d 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 +37,11 @@ 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; + cpumask_var_t cpus; + unsigned long throttled_freq; + int lmh_dcvs_irq; }; static unsigned long cpu_hw_rate, xo_rate; @@ -251,10 +259,79 @@ 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; + struct dev_pm_opp *opp; + struct device *dev; + unsigned long max_capacity, capacity, freq_hz; + unsigned int val, freq; + + val = readl_relaxed(data->base + data->soc_data->reg_current_vote); + freq = qcom_lmh_vote_to_freq(val); + freq_hz = freq * HZ_PER_KHZ; + + /* Do I need to calculate ceil and floor ? */ + dev = get_cpu_device(cpumask_first(data->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); + + data->throttled_freq = freq_hz / HZ_PER_KHZ; + + cpufreq_get_policy(&policy, cpumask_first(data->cpus)); + + /* Update thermal pressure */ + max_capacity = arch_scale_cpu_capacity(cpumask_first(data->cpus)); + capacity = data->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(data->cpus, max_capacity - capacity); +} + +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); + /** + * If h/w throttled frequency is higher than what cpufreq has requested for, stop + * polling and switch back to interrupt mechanism + */ + if (data->throttled_freq >= qcom_cpufreq_hw_get(cpumask_first(data->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 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); + mod_delayed_work(system_highpri_wq, &c_data->lmh_dcvs_poll_work, msecs_to_jiffies(10)); + + 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, }; @@ -285,6 +362,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) void __iomem *base; struct qcom_cpufreq_data *data; int ret, index; + bool lmh_mitigation_enabled = false; cpu_dev = get_cpu_device(policy->cpu); if (!cpu_dev) { @@ -305,6 +383,8 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) index = args.args[0]; + lmh_mitigation_enabled = of_property_read_bool(pdev->dev.of_node, "qcom,support-lmh"); + res = platform_get_resource(pdev, IORESOURCE_MEM, index); if (!res) { dev_err(dev, "failed to get mem resource %d\n", index); @@ -329,6 +409,11 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) goto unmap_base; } + if (!alloc_cpumask_var(&data->cpus, GFP_KERNEL)) { + ret = -ENOMEM; + goto unmap_base; + } + data->soc_data = of_device_get_match_data(&pdev->dev); data->base = base; data->res = res; @@ -347,6 +432,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) goto error; } + cpumask_copy(data->cpus, policy->cpus); policy->driver_data = data; ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy); @@ -370,6 +456,20 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); } + if (lmh_mitigation_enabled) { + data->lmh_dcvs_irq = platform_get_irq(pdev, index); + if (data->lmh_dcvs_irq < 0) { + ret = data->lmh_dcvs_irq; + goto error; + } + 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); + goto error; + } + INIT_DEFERRABLE_WORK(&data->lmh_dcvs_poll_work, qcom_lmh_dcvs_poll); + } return 0; error: kfree(data); -- 2.25.1