hwmon: Add amd_energy driver to report energy counters
This patch adds hwmon based amd_energy driver support for family 17h processors from AMD. The driver provides following interface to the userspace 1. Reports the per core consumption * file: "energy%d_input", label: "Ecore%03d" 2. Reports per socket energy consumption * file: "energy%d_input", label: "Esocket%d" 3. To, increase the wrap around time of the socket energy counters, a 64bit accumultor is implemented. 4. Reports scaled energy value in Joules. Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Naveen Krishna Chatradhi <nchatrad@amd.com> Link: https://lore.kernel.org/r/20200519155011.56184-1-nchatrad@amd.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Naveen Krishna Chatradhi
Guenter Roeck
parent
d06f9e6c89
commit
8abee9566b
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@ -324,6 +324,16 @@ config SENSORS_FAM15H_POWER
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This driver can also be built as a module. If so, the module
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will be called fam15h_power.
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config SENSORS_AMD_ENERGY
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tristate "AMD RAPL MSR based Energy driver"
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depends on X86
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help
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If you say yes here you get support for core and package energy
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sensors, based on RAPL MSR for AMD family 17h and above CPUs.
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This driver can also be built as a module. If so, the module
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will be called as amd_energy.
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config SENSORS_APPLESMC
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tristate "Apple SMC (Motion sensor, light sensor, keyboard backlight)"
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depends on INPUT && X86
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@ -45,6 +45,7 @@ obj-$(CONFIG_SENSORS_ADT7411) += adt7411.o
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obj-$(CONFIG_SENSORS_ADT7462) += adt7462.o
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obj-$(CONFIG_SENSORS_ADT7470) += adt7470.o
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obj-$(CONFIG_SENSORS_ADT7475) += adt7475.o
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obj-$(CONFIG_SENSORS_AMD_ENERGY) += amd_energy.o
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obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o
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obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o
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obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o
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@ -0,0 +1,406 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 Advanced Micro Devices, Inc.
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*/
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#include <asm/cpu_device_id.h>
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#include <linux/bits.h>
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#include <linux/cpu.h>
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#include <linux/cpumask.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/hwmon.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/processor.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/topology.h>
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#include <linux/types.h>
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#define DRVNAME "amd_energy"
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#define ENERGY_PWR_UNIT_MSR 0xC0010299
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#define ENERGY_CORE_MSR 0xC001029A
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#define ENERGY_PKG_MSR 0xC001029B
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#define AMD_ENERGY_UNIT_MASK 0x01F00
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#define AMD_ENERGY_MASK 0xFFFFFFFF
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struct sensor_accumulator {
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u64 energy_ctr;
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u64 prev_value;
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char label[10];
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};
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struct amd_energy_data {
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struct hwmon_channel_info energy_info;
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const struct hwmon_channel_info *info[2];
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struct hwmon_chip_info chip;
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struct task_struct *wrap_accumulate;
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/* Lock around the accumulator */
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struct mutex lock;
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/* An accumulator for each core and socket */
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struct sensor_accumulator *accums;
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/* Energy Status Units */
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u64 energy_units;
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int nr_cpus;
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int nr_socks;
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int core_id;
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};
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static int amd_energy_read_labels(struct device *dev,
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enum hwmon_sensor_types type,
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u32 attr, int channel,
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const char **str)
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{
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struct amd_energy_data *data = dev_get_drvdata(dev);
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*str = data->accums[channel].label;
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return 0;
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}
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static void get_energy_units(struct amd_energy_data *data)
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{
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u64 rapl_units;
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rdmsrl_safe(ENERGY_PWR_UNIT_MSR, &rapl_units);
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data->energy_units = (rapl_units & AMD_ENERGY_UNIT_MASK) >> 8;
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}
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static void accumulate_socket_delta(struct amd_energy_data *data,
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int sock, int cpu)
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{
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struct sensor_accumulator *s_accum;
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u64 input;
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mutex_lock(&data->lock);
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rdmsrl_safe_on_cpu(cpu, ENERGY_PKG_MSR, &input);
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input &= AMD_ENERGY_MASK;
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s_accum = &data->accums[data->nr_cpus + sock];
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if (input >= s_accum->prev_value)
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s_accum->energy_ctr +=
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input - s_accum->prev_value;
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else
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s_accum->energy_ctr += UINT_MAX -
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s_accum->prev_value + input;
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s_accum->prev_value = input;
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mutex_unlock(&data->lock);
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}
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static void accumulate_core_delta(struct amd_energy_data *data)
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{
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struct sensor_accumulator *c_accum;
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u64 input;
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int cpu;
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mutex_lock(&data->lock);
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if (data->core_id >= data->nr_cpus)
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data->core_id = 0;
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cpu = data->core_id;
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if (!cpu_online(cpu))
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goto out;
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rdmsrl_safe_on_cpu(cpu, ENERGY_CORE_MSR, &input);
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input &= AMD_ENERGY_MASK;
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c_accum = &data->accums[cpu];
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if (input >= c_accum->prev_value)
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c_accum->energy_ctr +=
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input - c_accum->prev_value;
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else
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c_accum->energy_ctr += UINT_MAX -
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c_accum->prev_value + input;
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c_accum->prev_value = input;
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out:
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data->core_id++;
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mutex_unlock(&data->lock);
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}
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static void read_accumulate(struct amd_energy_data *data)
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{
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int sock;
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for (sock = 0; sock < data->nr_socks; sock++) {
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int cpu;
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cpu = cpumask_first_and(cpu_online_mask,
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cpumask_of_node(sock));
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accumulate_socket_delta(data, sock, cpu);
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}
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accumulate_core_delta(data);
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}
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static void amd_add_delta(struct amd_energy_data *data, int ch,
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int cpu, long *val, bool is_core)
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{
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struct sensor_accumulator *s_accum, *c_accum;
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u64 input;
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mutex_lock(&data->lock);
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if (!is_core) {
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rdmsrl_safe_on_cpu(cpu, ENERGY_PKG_MSR, &input);
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input &= AMD_ENERGY_MASK;
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s_accum = &data->accums[ch];
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if (input >= s_accum->prev_value)
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input += s_accum->energy_ctr -
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s_accum->prev_value;
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else
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input += UINT_MAX - s_accum->prev_value +
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s_accum->energy_ctr;
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} else {
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rdmsrl_safe_on_cpu(cpu, ENERGY_CORE_MSR, &input);
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input &= AMD_ENERGY_MASK;
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c_accum = &data->accums[ch];
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if (input >= c_accum->prev_value)
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input += c_accum->energy_ctr -
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c_accum->prev_value;
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else
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input += UINT_MAX - c_accum->prev_value +
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c_accum->energy_ctr;
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}
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/* Energy consumed = (1/(2^ESU) * RAW * 1000000UL) μJoules */
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*val = div64_ul(input * 1000000UL, BIT(data->energy_units));
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mutex_unlock(&data->lock);
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}
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static int amd_energy_read(struct device *dev,
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enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct amd_energy_data *data = dev_get_drvdata(dev);
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int cpu;
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if (channel >= data->nr_cpus) {
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cpu = cpumask_first_and(cpu_online_mask,
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cpumask_of_node
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(channel - data->nr_cpus));
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amd_add_delta(data, channel, cpu, val, false);
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} else {
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cpu = channel;
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if (!cpu_online(cpu))
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return -ENODEV;
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amd_add_delta(data, channel, cpu, val, true);
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}
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return 0;
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}
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static umode_t amd_energy_is_visible(const void *_data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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return 0444;
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}
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static int energy_accumulator(void *p)
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{
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struct amd_energy_data *data = (struct amd_energy_data *)p;
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while (!kthread_should_stop()) {
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/*
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* Ignoring the conditions such as
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* cpu being offline or rdmsr failure
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*/
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read_accumulate(data);
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set_current_state(TASK_INTERRUPTIBLE);
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if (kthread_should_stop())
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break;
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/*
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* On a 240W system, with default resolution the
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* Socket Energy status register may wrap around in
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* 2^32*15.3 e-6/240 = 273.8041 secs (~4.5 mins)
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*
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* let us accumulate for every 100secs
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*/
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schedule_timeout(msecs_to_jiffies(100000));
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}
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return 0;
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}
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static const struct hwmon_ops amd_energy_ops = {
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.is_visible = amd_energy_is_visible,
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.read = amd_energy_read,
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.read_string = amd_energy_read_labels,
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};
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static int amd_create_sensor(struct device *dev,
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struct amd_energy_data *data,
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u8 type, u32 config)
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{
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struct hwmon_channel_info *info = &data->energy_info;
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struct sensor_accumulator *accums;
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int i, num_siblings, cpus, sockets;
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u32 *s_config;
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/* Identify the number of siblings per core */
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num_siblings = ((cpuid_ebx(0x8000001e) >> 8) & 0xff) + 1;
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sockets = num_possible_nodes();
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/*
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* Energy counter register is accessed at core level.
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* Hence, filterout the siblings.
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*/
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cpus = num_present_cpus() / num_siblings;
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s_config = devm_kcalloc(dev, cpus + sockets,
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sizeof(u32), GFP_KERNEL);
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if (!s_config)
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return -ENOMEM;
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accums = devm_kcalloc(dev, cpus + sockets,
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sizeof(struct sensor_accumulator),
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GFP_KERNEL);
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if (!accums)
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return -ENOMEM;
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info->type = type;
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info->config = s_config;
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data->nr_cpus = cpus;
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data->nr_socks = sockets;
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data->accums = accums;
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for (i = 0; i < cpus + sockets; i++) {
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s_config[i] = config;
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if (i < cpus)
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scnprintf(accums[i].label, 10,
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"Ecore%03u", i);
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else
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scnprintf(accums[i].label, 10,
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"Esocket%u", (i - cpus));
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}
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return 0;
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}
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static int amd_energy_probe(struct platform_device *pdev)
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{
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struct device *hwmon_dev;
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struct amd_energy_data *data;
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struct device *dev = &pdev->dev;
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data = devm_kzalloc(dev,
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sizeof(struct amd_energy_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->chip.ops = &amd_energy_ops;
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data->chip.info = data->info;
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dev_set_drvdata(dev, data);
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/* Populate per-core energy reporting */
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data->info[0] = &data->energy_info;
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amd_create_sensor(dev, data, hwmon_energy,
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HWMON_E_INPUT | HWMON_E_LABEL);
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mutex_init(&data->lock);
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get_energy_units(data);
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hwmon_dev = devm_hwmon_device_register_with_info(dev, DRVNAME,
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data,
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&data->chip,
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NULL);
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if (IS_ERR(hwmon_dev))
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return PTR_ERR(hwmon_dev);
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data->wrap_accumulate = kthread_run(energy_accumulator, data,
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"%s", dev_name(hwmon_dev));
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if (IS_ERR(data->wrap_accumulate))
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return PTR_ERR(data->wrap_accumulate);
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return PTR_ERR_OR_ZERO(data->wrap_accumulate);
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}
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static int amd_energy_remove(struct platform_device *pdev)
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{
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struct amd_energy_data *data = dev_get_drvdata(&pdev->dev);
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if (data && data->wrap_accumulate)
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kthread_stop(data->wrap_accumulate);
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return 0;
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}
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static const struct platform_device_id amd_energy_ids[] = {
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{ .name = DRVNAME, },
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{}
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};
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MODULE_DEVICE_TABLE(platform, amd_energy_ids);
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static struct platform_driver amd_energy_driver = {
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.probe = amd_energy_probe,
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.remove = amd_energy_remove,
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.id_table = amd_energy_ids,
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.driver = {
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.name = DRVNAME,
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},
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};
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static struct platform_device *amd_energy_platdev;
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static const struct x86_cpu_id cpu_ids[] __initconst = {
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X86_MATCH_VENDOR_FAM(AMD, 0x17, NULL),
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, cpu_ids);
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static int __init amd_energy_init(void)
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{
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int ret;
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if (!x86_match_cpu(cpu_ids))
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return -ENODEV;
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ret = platform_driver_register(&amd_energy_driver);
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if (ret)
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return ret;
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amd_energy_platdev = platform_device_alloc(DRVNAME, 0);
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if (!amd_energy_platdev)
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return -ENOMEM;
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ret = platform_device_add(amd_energy_platdev);
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if (ret) {
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platform_device_put(amd_energy_platdev);
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platform_driver_unregister(&amd_energy_driver);
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return ret;
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}
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return ret;
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}
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static void __exit amd_energy_exit(void)
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{
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platform_device_unregister(amd_energy_platdev);
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platform_driver_unregister(&amd_energy_driver);
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}
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module_init(amd_energy_init);
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module_exit(amd_energy_exit);
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MODULE_DESCRIPTION("Driver for AMD Energy reporting from RAPL MSR via HWMON interface");
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MODULE_AUTHOR("Naveen Krishna Chatradhi <nchatrad@amd.com>");
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MODULE_LICENSE("GPL");
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