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-rw-r--r--drivers/hwmon/fam15h_power.c500
1 files changed, 500 insertions, 0 deletions
diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c
new file mode 100644
index 000000000..521534d5c
--- /dev/null
+++ b/drivers/hwmon/fam15h_power.c
@@ -0,0 +1,500 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * fam15h_power.c - AMD Family 15h processor power monitoring
+ *
+ * Copyright (c) 2011-2016 Advanced Micro Devices, Inc.
+ * Author: Andreas Herrmann <herrmann.der.user@googlemail.com>
+ */
+
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/bitops.h>
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/time.h>
+#include <linux/sched.h>
+#include <asm/processor.h>
+#include <asm/msr.h>
+
+MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
+MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");
+MODULE_LICENSE("GPL");
+
+/* D18F3 */
+#define REG_NORTHBRIDGE_CAP 0xe8
+
+/* D18F4 */
+#define REG_PROCESSOR_TDP 0x1b8
+
+/* D18F5 */
+#define REG_TDP_RUNNING_AVERAGE 0xe0
+#define REG_TDP_LIMIT3 0xe8
+
+#define FAM15H_MIN_NUM_ATTRS 2
+#define FAM15H_NUM_GROUPS 2
+#define MAX_CUS 8
+
+/* set maximum interval as 1 second */
+#define MAX_INTERVAL 1000
+
+#define PCI_DEVICE_ID_AMD_15H_M70H_NB_F4 0x15b4
+
+struct fam15h_power_data {
+ struct pci_dev *pdev;
+ unsigned int tdp_to_watts;
+ unsigned int base_tdp;
+ unsigned int processor_pwr_watts;
+ unsigned int cpu_pwr_sample_ratio;
+ const struct attribute_group *groups[FAM15H_NUM_GROUPS];
+ struct attribute_group group;
+ /* maximum accumulated power of a compute unit */
+ u64 max_cu_acc_power;
+ /* accumulated power of the compute units */
+ u64 cu_acc_power[MAX_CUS];
+ /* performance timestamp counter */
+ u64 cpu_sw_pwr_ptsc[MAX_CUS];
+ /* online/offline status of current compute unit */
+ int cu_on[MAX_CUS];
+ unsigned long power_period;
+};
+
+static bool is_carrizo_or_later(void)
+{
+ return boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model >= 0x60;
+}
+
+static ssize_t power1_input_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u32 val, tdp_limit, running_avg_range;
+ s32 running_avg_capture;
+ u64 curr_pwr_watts;
+ struct fam15h_power_data *data = dev_get_drvdata(dev);
+ struct pci_dev *f4 = data->pdev;
+
+ pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
+ REG_TDP_RUNNING_AVERAGE, &val);
+
+ /*
+ * On Carrizo and later platforms, TdpRunAvgAccCap bit field
+ * is extended to 4:31 from 4:25.
+ */
+ if (is_carrizo_or_later()) {
+ running_avg_capture = val >> 4;
+ running_avg_capture = sign_extend32(running_avg_capture, 27);
+ } else {
+ running_avg_capture = (val >> 4) & 0x3fffff;
+ running_avg_capture = sign_extend32(running_avg_capture, 21);
+ }
+
+ running_avg_range = (val & 0xf) + 1;
+
+ pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
+ REG_TDP_LIMIT3, &val);
+
+ /*
+ * On Carrizo and later platforms, ApmTdpLimit bit field
+ * is extended to 16:31 from 16:28.
+ */
+ if (is_carrizo_or_later())
+ tdp_limit = val >> 16;
+ else
+ tdp_limit = (val >> 16) & 0x1fff;
+
+ curr_pwr_watts = ((u64)(tdp_limit +
+ data->base_tdp)) << running_avg_range;
+ curr_pwr_watts -= running_avg_capture;
+ curr_pwr_watts *= data->tdp_to_watts;
+
+ /*
+ * Convert to microWatt
+ *
+ * power is in Watt provided as fixed point integer with
+ * scaling factor 1/(2^16). For conversion we use
+ * (10^6)/(2^16) = 15625/(2^10)
+ */
+ curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
+ return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
+}
+static DEVICE_ATTR_RO(power1_input);
+
+static ssize_t power1_crit_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fam15h_power_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", data->processor_pwr_watts);
+}
+static DEVICE_ATTR_RO(power1_crit);
+
+static void do_read_registers_on_cu(void *_data)
+{
+ struct fam15h_power_data *data = _data;
+ int cpu, cu;
+
+ cpu = smp_processor_id();
+
+ /*
+ * With the new x86 topology modelling, cpu core id actually
+ * is compute unit id.
+ */
+ cu = cpu_data(cpu).cpu_core_id;
+
+ rdmsrl_safe(MSR_F15H_CU_PWR_ACCUMULATOR, &data->cu_acc_power[cu]);
+ rdmsrl_safe(MSR_F15H_PTSC, &data->cpu_sw_pwr_ptsc[cu]);
+
+ data->cu_on[cu] = 1;
+}
+
+/*
+ * This function is only able to be called when CPUID
+ * Fn8000_0007:EDX[12] is set.
+ */
+static int read_registers(struct fam15h_power_data *data)
+{
+ int core, this_core;
+ cpumask_var_t mask;
+ int ret, cpu;
+
+ ret = zalloc_cpumask_var(&mask, GFP_KERNEL);
+ if (!ret)
+ return -ENOMEM;
+
+ memset(data->cu_on, 0, sizeof(int) * MAX_CUS);
+
+ cpus_read_lock();
+
+ /*
+ * Choose the first online core of each compute unit, and then
+ * read their MSR value of power and ptsc in a single IPI,
+ * because the MSR value of CPU core represent the compute
+ * unit's.
+ */
+ core = -1;
+
+ for_each_online_cpu(cpu) {
+ this_core = topology_core_id(cpu);
+
+ if (this_core == core)
+ continue;
+
+ core = this_core;
+
+ /* get any CPU on this compute unit */
+ cpumask_set_cpu(cpumask_any(topology_sibling_cpumask(cpu)), mask);
+ }
+
+ on_each_cpu_mask(mask, do_read_registers_on_cu, data, true);
+
+ cpus_read_unlock();
+ free_cpumask_var(mask);
+
+ return 0;
+}
+
+static ssize_t power1_average_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fam15h_power_data *data = dev_get_drvdata(dev);
+ u64 prev_cu_acc_power[MAX_CUS], prev_ptsc[MAX_CUS],
+ jdelta[MAX_CUS];
+ u64 tdelta, avg_acc;
+ int cu, cu_num, ret;
+ signed long leftover;
+
+ /*
+ * With the new x86 topology modelling, x86_max_cores is the
+ * compute unit number.
+ */
+ cu_num = boot_cpu_data.x86_max_cores;
+
+ ret = read_registers(data);
+ if (ret)
+ return 0;
+
+ for (cu = 0; cu < cu_num; cu++) {
+ prev_cu_acc_power[cu] = data->cu_acc_power[cu];
+ prev_ptsc[cu] = data->cpu_sw_pwr_ptsc[cu];
+ }
+
+ leftover = schedule_timeout_interruptible(msecs_to_jiffies(data->power_period));
+ if (leftover)
+ return 0;
+
+ ret = read_registers(data);
+ if (ret)
+ return 0;
+
+ for (cu = 0, avg_acc = 0; cu < cu_num; cu++) {
+ /* check if current compute unit is online */
+ if (data->cu_on[cu] == 0)
+ continue;
+
+ if (data->cu_acc_power[cu] < prev_cu_acc_power[cu]) {
+ jdelta[cu] = data->max_cu_acc_power + data->cu_acc_power[cu];
+ jdelta[cu] -= prev_cu_acc_power[cu];
+ } else {
+ jdelta[cu] = data->cu_acc_power[cu] - prev_cu_acc_power[cu];
+ }
+ tdelta = data->cpu_sw_pwr_ptsc[cu] - prev_ptsc[cu];
+ jdelta[cu] *= data->cpu_pwr_sample_ratio * 1000;
+ do_div(jdelta[cu], tdelta);
+
+ /* the unit is microWatt */
+ avg_acc += jdelta[cu];
+ }
+
+ return sprintf(buf, "%llu\n", (unsigned long long)avg_acc);
+}
+static DEVICE_ATTR_RO(power1_average);
+
+static ssize_t power1_average_interval_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct fam15h_power_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%lu\n", data->power_period);
+}
+
+static ssize_t power1_average_interval_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fam15h_power_data *data = dev_get_drvdata(dev);
+ unsigned long temp;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &temp);
+ if (ret)
+ return ret;
+
+ if (temp > MAX_INTERVAL)
+ return -EINVAL;
+
+ /* the interval value should be greater than 0 */
+ if (temp <= 0)
+ return -EINVAL;
+
+ data->power_period = temp;
+
+ return count;
+}
+static DEVICE_ATTR_RW(power1_average_interval);
+
+static int fam15h_power_init_attrs(struct pci_dev *pdev,
+ struct fam15h_power_data *data)
+{
+ int n = FAM15H_MIN_NUM_ATTRS;
+ struct attribute **fam15h_power_attrs;
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+
+ if (c->x86 == 0x15 &&
+ (c->x86_model <= 0xf ||
+ (c->x86_model >= 0x60 && c->x86_model <= 0x7f)))
+ n += 1;
+
+ /* check if processor supports accumulated power */
+ if (boot_cpu_has(X86_FEATURE_ACC_POWER))
+ n += 2;
+
+ fam15h_power_attrs = devm_kcalloc(&pdev->dev, n,
+ sizeof(*fam15h_power_attrs),
+ GFP_KERNEL);
+
+ if (!fam15h_power_attrs)
+ return -ENOMEM;
+
+ n = 0;
+ fam15h_power_attrs[n++] = &dev_attr_power1_crit.attr;
+ if (c->x86 == 0x15 &&
+ (c->x86_model <= 0xf ||
+ (c->x86_model >= 0x60 && c->x86_model <= 0x7f)))
+ fam15h_power_attrs[n++] = &dev_attr_power1_input.attr;
+
+ if (boot_cpu_has(X86_FEATURE_ACC_POWER)) {
+ fam15h_power_attrs[n++] = &dev_attr_power1_average.attr;
+ fam15h_power_attrs[n++] = &dev_attr_power1_average_interval.attr;
+ }
+
+ data->group.attrs = fam15h_power_attrs;
+
+ return 0;
+}
+
+static bool should_load_on_this_node(struct pci_dev *f4)
+{
+ u32 val;
+
+ pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
+ REG_NORTHBRIDGE_CAP, &val);
+ if ((val & BIT(29)) && ((val >> 30) & 3))
+ return false;
+
+ return true;
+}
+
+/*
+ * Newer BKDG versions have an updated recommendation on how to properly
+ * initialize the running average range (was: 0xE, now: 0x9). This avoids
+ * counter saturations resulting in bogus power readings.
+ * We correct this value ourselves to cope with older BIOSes.
+ */
+static const struct pci_device_id affected_device[] = {
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
+ { 0 }
+};
+
+static void tweak_runavg_range(struct pci_dev *pdev)
+{
+ u32 val;
+
+ /*
+ * let this quirk apply only to the current version of the
+ * northbridge, since future versions may change the behavior
+ */
+ if (!pci_match_id(affected_device, pdev))
+ return;
+
+ pci_bus_read_config_dword(pdev->bus,
+ PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
+ REG_TDP_RUNNING_AVERAGE, &val);
+ if ((val & 0xf) != 0xe)
+ return;
+
+ val &= ~0xf;
+ val |= 0x9;
+ pci_bus_write_config_dword(pdev->bus,
+ PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
+ REG_TDP_RUNNING_AVERAGE, val);
+}
+
+#ifdef CONFIG_PM
+static int fam15h_power_resume(struct pci_dev *pdev)
+{
+ tweak_runavg_range(pdev);
+ return 0;
+}
+#else
+#define fam15h_power_resume NULL
+#endif
+
+static int fam15h_power_init_data(struct pci_dev *f4,
+ struct fam15h_power_data *data)
+{
+ u32 val;
+ u64 tmp;
+ int ret;
+
+ pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
+ data->base_tdp = val >> 16;
+ tmp = val & 0xffff;
+
+ pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
+ REG_TDP_LIMIT3, &val);
+
+ data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
+ tmp *= data->tdp_to_watts;
+
+ /* result not allowed to be >= 256W */
+ if ((tmp >> 16) >= 256)
+ dev_warn(&f4->dev,
+ "Bogus value for ProcessorPwrWatts (processor_pwr_watts>=%u)\n",
+ (unsigned int) (tmp >> 16));
+
+ /* convert to microWatt */
+ data->processor_pwr_watts = (tmp * 15625) >> 10;
+
+ ret = fam15h_power_init_attrs(f4, data);
+ if (ret)
+ return ret;
+
+
+ /* CPUID Fn8000_0007:EDX[12] indicates to support accumulated power */
+ if (!boot_cpu_has(X86_FEATURE_ACC_POWER))
+ return 0;
+
+ /*
+ * determine the ratio of the compute unit power accumulator
+ * sample period to the PTSC counter period by executing CPUID
+ * Fn8000_0007:ECX
+ */
+ data->cpu_pwr_sample_ratio = cpuid_ecx(0x80000007);
+
+ if (rdmsrl_safe(MSR_F15H_CU_MAX_PWR_ACCUMULATOR, &tmp)) {
+ pr_err("Failed to read max compute unit power accumulator MSR\n");
+ return -ENODEV;
+ }
+
+ data->max_cu_acc_power = tmp;
+
+ /*
+ * Milliseconds are a reasonable interval for the measurement.
+ * But it shouldn't set too long here, because several seconds
+ * would cause the read function to hang. So set default
+ * interval as 10 ms.
+ */
+ data->power_period = 10;
+
+ return read_registers(data);
+}
+
+static int fam15h_power_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct fam15h_power_data *data;
+ struct device *dev = &pdev->dev;
+ struct device *hwmon_dev;
+ int ret;
+
+ /*
+ * though we ignore every other northbridge, we still have to
+ * do the tweaking on _each_ node in MCM processors as the counters
+ * are working hand-in-hand
+ */
+ tweak_runavg_range(pdev);
+
+ if (!should_load_on_this_node(pdev))
+ return -ENODEV;
+
+ data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = fam15h_power_init_data(pdev, data);
+ if (ret)
+ return ret;
+
+ data->pdev = pdev;
+
+ data->groups[0] = &data->group;
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, "fam15h_power",
+ data,
+ &data->groups[0]);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct pci_device_id fam15h_power_id_table[] = {
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M70H_NB_F4) },
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
+ {}
+};
+MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);
+
+static struct pci_driver fam15h_power_driver = {
+ .name = "fam15h_power",
+ .id_table = fam15h_power_id_table,
+ .probe = fam15h_power_probe,
+ .resume = fam15h_power_resume,
+};
+
+module_pci_driver(fam15h_power_driver);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 18:31:41 +0000