diff options
Diffstat (limited to 'drivers/thermal/intel')
4 files changed, 202 insertions, 1 deletions
diff --git a/drivers/thermal/intel/int340x_thermal/Makefile b/drivers/thermal/intel/int340x_thermal/Makefile index f33a3ad3bef3..fe3f43924525 100644 --- a/drivers/thermal/intel/int340x_thermal/Makefile +++ b/drivers/thermal/intel/int340x_thermal/Makefile @@ -12,5 +12,6 @@ obj-$(CONFIG_INT340X_THERMAL) += processor_thermal_rfim.o obj-$(CONFIG_INT340X_THERMAL) += processor_thermal_mbox.o obj-$(CONFIG_INT340X_THERMAL) += processor_thermal_wt_req.o obj-$(CONFIG_INT340X_THERMAL) += processor_thermal_wt_hint.o +obj-$(CONFIG_INT340X_THERMAL) += processor_thermal_power_floor.o obj-$(CONFIG_INT3406_THERMAL) += int3406_thermal.o obj-$(CONFIG_ACPI_THERMAL_REL) += acpi_thermal_rel.o diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c index 29ed7d0f7022..649f67fdf345 100644 --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c @@ -26,6 +26,48 @@ static ssize_t power_limit_##index##_##suffix##_show(struct device *dev, \ (unsigned long)proc_dev->power_limits[index].suffix * 1000); \ } +static ssize_t power_floor_status_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); + int ret; + + ret = proc_thermal_read_power_floor_status(proc_dev); + + return sysfs_emit(buf, "%d\n", ret); +} + +static ssize_t power_floor_enable_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); + bool ret; + + ret = proc_thermal_power_floor_get_state(proc_dev); + + return sysfs_emit(buf, "%d\n", ret); +} + +static ssize_t power_floor_enable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct proc_thermal_device *proc_dev = dev_get_drvdata(dev); + u8 state; + int ret; + + if (kstrtou8(buf, 0, &state)) + return -EINVAL; + + ret = proc_thermal_power_floor_set_state(proc_dev, !!state); + if (ret) + return ret; + + return count; +} + POWER_LIMIT_SHOW(0, min_uw) POWER_LIMIT_SHOW(0, max_uw) POWER_LIMIT_SHOW(0, step_uw) @@ -50,6 +92,9 @@ static DEVICE_ATTR_RO(power_limit_1_step_uw); static DEVICE_ATTR_RO(power_limit_1_tmin_us); static DEVICE_ATTR_RO(power_limit_1_tmax_us); +static DEVICE_ATTR_RO(power_floor_status); +static DEVICE_ATTR_RW(power_floor_enable); + static struct attribute *power_limit_attrs[] = { &dev_attr_power_limit_0_min_uw.attr, &dev_attr_power_limit_1_min_uw.attr, @@ -61,12 +106,30 @@ static struct attribute *power_limit_attrs[] = { &dev_attr_power_limit_1_tmin_us.attr, &dev_attr_power_limit_0_tmax_us.attr, &dev_attr_power_limit_1_tmax_us.attr, + &dev_attr_power_floor_status.attr, + &dev_attr_power_floor_enable.attr, NULL }; +static umode_t power_limit_attr_visible(struct kobject *kobj, struct attribute *attr, int unused) +{ + struct device *dev = kobj_to_dev(kobj); + struct proc_thermal_device *proc_dev; + + if (attr != &dev_attr_power_floor_status.attr && attr != &dev_attr_power_floor_enable.attr) + return attr->mode; + + proc_dev = dev_get_drvdata(dev); + if (!proc_dev || !(proc_dev->mmio_feature_mask & PROC_THERMAL_FEATURE_POWER_FLOOR)) + return 0; + + return attr->mode; +} + static const struct attribute_group power_limit_attribute_group = { .attrs = power_limit_attrs, - .name = "power_limits" + .name = "power_limits", + .is_visible = power_limit_attr_visible, }; static ssize_t tcc_offset_degree_celsius_show(struct device *dev, @@ -380,6 +443,9 @@ void proc_thermal_mmio_remove(struct pci_dev *pdev, struct proc_thermal_device * proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_DVFS) proc_thermal_rfim_remove(pdev); + if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_POWER_FLOOR) + proc_thermal_power_floor_set_state(proc_priv, false); + if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_WT_REQ) proc_thermal_wt_req_remove(pdev); else if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_WT_HINT) diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h index f9a381b3e55c..95c6013a33fb 100644 --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h @@ -63,6 +63,7 @@ struct rapl_mmio_regs { #define PROC_THERMAL_FEATURE_WT_REQ 0x08 #define PROC_THERMAL_FEATURE_DLVR 0x10 #define PROC_THERMAL_FEATURE_WT_HINT 0x20 +#define PROC_THERMAL_FEATURE_POWER_FLOOR 0x40 #if IS_ENABLED(CONFIG_PROC_THERMAL_MMIO_RAPL) int proc_thermal_rapl_add(struct pci_dev *pdev, struct proc_thermal_device *proc_priv); @@ -94,6 +95,13 @@ void proc_thermal_wt_req_remove(struct pci_dev *pdev); #define SOC_WT_RES_INT_STATUS_OFFSET 0x5B18 #define SOC_WT_RES_INT_STATUS_MASK GENMASK_ULL(3, 2) +int proc_thermal_read_power_floor_status(struct proc_thermal_device *proc_priv); +int proc_thermal_power_floor_set_state(struct proc_thermal_device *proc_priv, bool enable); +bool proc_thermal_power_floor_get_state(struct proc_thermal_device *proc_priv); +void proc_thermal_power_floor_intr_callback(struct pci_dev *pdev, + struct proc_thermal_device *proc_priv); +bool proc_thermal_check_power_floor_intr(struct proc_thermal_device *proc_priv); + int processor_thermal_send_mbox_read_cmd(struct pci_dev *pdev, u16 id, u64 *resp); int processor_thermal_send_mbox_write_cmd(struct pci_dev *pdev, u16 id, u32 data); int processor_thermal_mbox_interrupt_config(struct pci_dev *pdev, bool enable, int enable_bit, diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_power_floor.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_power_floor.c new file mode 100644 index 000000000000..a1a108407f0f --- /dev/null +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_power_floor.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Processor thermal device module for registering and processing + * power floor. When the hardware reduces the power to the minimum + * possible, the power floor is notified via an interrupt. + * + * Operation: + * When user space enables power floor reporting: + * - Use mailbox to: + * Enable processor thermal device interrupt + * + * - Current status of power floor is read from offset 0x5B18 + * bit 39. + * + * Two interface functions are provided to call when there is a + * thermal device interrupt: + * - proc_thermal_power_floor_intr(): + * Check if the interrupt is for change in power floor. + * Called from interrupt context. + * + * - proc_thermal_power_floor_intr_callback(): + * Callback for interrupt processing in thread context. This involves + * sending notification to user space that there is a change in the + * power floor status. + * + * Copyright (c) 2023, Intel Corporation. + */ + +#include <linux/pci.h> +#include "processor_thermal_device.h" + +#define SOC_POWER_FLOOR_STATUS BIT(39) +#define SOC_POWER_FLOOR_SHIFT 39 + +#define SOC_POWER_FLOOR_INT_ENABLE_BIT 31 +#define SOC_POWER_FLOOR_INT_ACTIVE BIT(3) + +int proc_thermal_read_power_floor_status(struct proc_thermal_device *proc_priv) +{ + u64 status = 0; + + status = readq(proc_priv->mmio_base + SOC_WT_RES_INT_STATUS_OFFSET); + return (status & SOC_POWER_FLOOR_STATUS) >> SOC_POWER_FLOOR_SHIFT; +} +EXPORT_SYMBOL_NS_GPL(proc_thermal_read_power_floor_status, INT340X_THERMAL); + +static bool enable_state; +static DEFINE_MUTEX(pf_lock); + +int proc_thermal_power_floor_set_state(struct proc_thermal_device *proc_priv, bool enable) +{ + int ret = 0; + + mutex_lock(&pf_lock); + if (enable_state == enable) + goto pf_unlock; + + /* + * Time window parameter is not applicable to power floor interrupt configuration. + * Hence use -1 for time window. + */ + ret = processor_thermal_mbox_interrupt_config(to_pci_dev(proc_priv->dev), enable, + SOC_POWER_FLOOR_INT_ENABLE_BIT, -1); + if (!ret) + enable_state = enable; + +pf_unlock: + mutex_unlock(&pf_lock); + + return ret; +} +EXPORT_SYMBOL_NS_GPL(proc_thermal_power_floor_set_state, INT340X_THERMAL); + +bool proc_thermal_power_floor_get_state(struct proc_thermal_device *proc_priv) +{ + return enable_state; +} +EXPORT_SYMBOL_NS_GPL(proc_thermal_power_floor_get_state, INT340X_THERMAL); + +/** + * proc_thermal_check_power_floor_intr() - Check power floor interrupt. + * @proc_priv: Processor thermal device instance. + * + * Callback to check if the interrupt for power floor is active. + * + * Context: Called from interrupt context. + * + * Return: true if power floor is active, false when not active. + */ +bool proc_thermal_check_power_floor_intr(struct proc_thermal_device *proc_priv) +{ + u64 int_status; + + int_status = readq(proc_priv->mmio_base + SOC_WT_RES_INT_STATUS_OFFSET); + return !!(int_status & SOC_POWER_FLOOR_INT_ACTIVE); +} +EXPORT_SYMBOL_NS_GPL(proc_thermal_check_power_floor_intr, INT340X_THERMAL); + +/** + * proc_thermal_power_floor_intr_callback() - Process power floor notification + * @pdev: PCI device instance + * @proc_priv: Processor thermal device instance. + * + * Check if the power floor interrupt is active, if active send notification to + * user space for the attribute "power_limits", so that user can read the attribute + * and take action. + * + * Context: Called from interrupt thread context. + * + * Return: None. + */ +void proc_thermal_power_floor_intr_callback(struct pci_dev *pdev, + struct proc_thermal_device *proc_priv) +{ + u64 status; + + status = readq(proc_priv->mmio_base + SOC_WT_RES_INT_STATUS_OFFSET); + if (!(status & SOC_POWER_FLOOR_INT_ACTIVE)) + return; + + sysfs_notify(&pdev->dev.kobj, "power_limits", "power_floor_status"); +} +EXPORT_SYMBOL_NS_GPL(proc_thermal_power_floor_intr_callback, INT340X_THERMAL); + +MODULE_IMPORT_NS(INT340X_THERMAL); +MODULE_LICENSE("GPL"); |