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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * fam15h_power.c - AMD Family 15h processor power monitoring4 *5 * Copyright (c) 2011-2016 Advanced Micro Devices, Inc.6 * Author: Andreas Herrmann <herrmann.der.user@googlemail.com>7 */8 9#include <linux/err.h>10#include <linux/hwmon.h>11#include <linux/hwmon-sysfs.h>12#include <linux/init.h>13#include <linux/module.h>14#include <linux/pci.h>15#include <linux/bitops.h>16#include <linux/cpu.h>17#include <linux/cpumask.h>18#include <linux/time.h>19#include <linux/sched.h>20#include <linux/topology.h>21#include <asm/processor.h>22#include <asm/msr.h>23 24MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");25MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");26MODULE_LICENSE("GPL");27 28/* D18F3 */29#define REG_NORTHBRIDGE_CAP		0xe830 31/* D18F4 */32#define REG_PROCESSOR_TDP		0x1b833 34/* D18F5 */35#define REG_TDP_RUNNING_AVERAGE		0xe036#define REG_TDP_LIMIT3			0xe837 38#define FAM15H_MIN_NUM_ATTRS		239#define FAM15H_NUM_GROUPS		240#define MAX_CUS				841 42/* set maximum interval as 1 second */43#define MAX_INTERVAL			100044 45#define PCI_DEVICE_ID_AMD_15H_M70H_NB_F4 0x15b446 47struct fam15h_power_data {48	struct pci_dev *pdev;49	unsigned int tdp_to_watts;50	unsigned int base_tdp;51	unsigned int processor_pwr_watts;52	unsigned int cpu_pwr_sample_ratio;53	const struct attribute_group *groups[FAM15H_NUM_GROUPS];54	struct attribute_group group;55	/* maximum accumulated power of a compute unit */56	u64 max_cu_acc_power;57	/* accumulated power of the compute units */58	u64 cu_acc_power[MAX_CUS];59	/* performance timestamp counter */60	u64 cpu_sw_pwr_ptsc[MAX_CUS];61	/* online/offline status of current compute unit */62	int cu_on[MAX_CUS];63	unsigned long power_period;64};65 66static bool is_carrizo_or_later(void)67{68	return boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model >= 0x60;69}70 71static ssize_t power1_input_show(struct device *dev,72				 struct device_attribute *attr, char *buf)73{74	u32 val, tdp_limit, running_avg_range;75	s32 running_avg_capture;76	u64 curr_pwr_watts;77	struct fam15h_power_data *data = dev_get_drvdata(dev);78	struct pci_dev *f4 = data->pdev;79 80	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),81				  REG_TDP_RUNNING_AVERAGE, &val);82 83	/*84	 * On Carrizo and later platforms, TdpRunAvgAccCap bit field85	 * is extended to 4:31 from 4:25.86	 */87	if (is_carrizo_or_later()) {88		running_avg_capture = val >> 4;89		running_avg_capture = sign_extend32(running_avg_capture, 27);90	} else {91		running_avg_capture = (val >> 4) & 0x3fffff;92		running_avg_capture = sign_extend32(running_avg_capture, 21);93	}94 95	running_avg_range = (val & 0xf) + 1;96 97	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),98				  REG_TDP_LIMIT3, &val);99 100	/*101	 * On Carrizo and later platforms, ApmTdpLimit bit field102	 * is extended to 16:31 from 16:28.103	 */104	if (is_carrizo_or_later())105		tdp_limit = val >> 16;106	else107		tdp_limit = (val >> 16) & 0x1fff;108 109	curr_pwr_watts = ((u64)(tdp_limit +110				data->base_tdp)) << running_avg_range;111	curr_pwr_watts -= running_avg_capture;112	curr_pwr_watts *= data->tdp_to_watts;113 114	/*115	 * Convert to microWatt116	 *117	 * power is in Watt provided as fixed point integer with118	 * scaling factor 1/(2^16).  For conversion we use119	 * (10^6)/(2^16) = 15625/(2^10)120	 */121	curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);122	return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);123}124static DEVICE_ATTR_RO(power1_input);125 126static ssize_t power1_crit_show(struct device *dev,127				struct device_attribute *attr, char *buf)128{129	struct fam15h_power_data *data = dev_get_drvdata(dev);130 131	return sprintf(buf, "%u\n", data->processor_pwr_watts);132}133static DEVICE_ATTR_RO(power1_crit);134 135static void do_read_registers_on_cu(void *_data)136{137	struct fam15h_power_data *data = _data;138	int cu;139 140	/*141	 * With the new x86 topology modelling, cpu core id actually142	 * is compute unit id.143	 */144	cu = topology_core_id(smp_processor_id());145 146	rdmsrl_safe(MSR_F15H_CU_PWR_ACCUMULATOR, &data->cu_acc_power[cu]);147	rdmsrl_safe(MSR_F15H_PTSC, &data->cpu_sw_pwr_ptsc[cu]);148 149	data->cu_on[cu] = 1;150}151 152/*153 * This function is only able to be called when CPUID154 * Fn8000_0007:EDX[12] is set.155 */156static int read_registers(struct fam15h_power_data *data)157{158	int core, this_core;159	cpumask_var_t mask;160	int ret, cpu;161 162	ret = zalloc_cpumask_var(&mask, GFP_KERNEL);163	if (!ret)164		return -ENOMEM;165 166	memset(data->cu_on, 0, sizeof(int) * MAX_CUS);167 168	cpus_read_lock();169 170	/*171	 * Choose the first online core of each compute unit, and then172	 * read their MSR value of power and ptsc in a single IPI,173	 * because the MSR value of CPU core represent the compute174	 * unit's.175	 */176	core = -1;177 178	for_each_online_cpu(cpu) {179		this_core = topology_core_id(cpu);180 181		if (this_core == core)182			continue;183 184		core = this_core;185 186		/* get any CPU on this compute unit */187		cpumask_set_cpu(cpumask_any(topology_sibling_cpumask(cpu)), mask);188	}189 190	on_each_cpu_mask(mask, do_read_registers_on_cu, data, true);191 192	cpus_read_unlock();193	free_cpumask_var(mask);194 195	return 0;196}197 198static ssize_t power1_average_show(struct device *dev,199				   struct device_attribute *attr, char *buf)200{201	struct fam15h_power_data *data = dev_get_drvdata(dev);202	u64 prev_cu_acc_power[MAX_CUS], prev_ptsc[MAX_CUS],203	    jdelta[MAX_CUS];204	u64 tdelta, avg_acc;205	int cu, cu_num, ret;206	signed long leftover;207 208	/*209	 * With the new x86 topology modelling, x86_max_cores is the210	 * compute unit number.211	 */212	cu_num = topology_num_cores_per_package();213 214	ret = read_registers(data);215	if (ret)216		return 0;217 218	for (cu = 0; cu < cu_num; cu++) {219		prev_cu_acc_power[cu] = data->cu_acc_power[cu];220		prev_ptsc[cu] = data->cpu_sw_pwr_ptsc[cu];221	}222 223	leftover = schedule_timeout_interruptible(msecs_to_jiffies(data->power_period));224	if (leftover)225		return 0;226 227	ret = read_registers(data);228	if (ret)229		return 0;230 231	for (cu = 0, avg_acc = 0; cu < cu_num; cu++) {232		/* check if current compute unit is online */233		if (data->cu_on[cu] == 0)234			continue;235 236		if (data->cu_acc_power[cu] < prev_cu_acc_power[cu]) {237			jdelta[cu] = data->max_cu_acc_power + data->cu_acc_power[cu];238			jdelta[cu] -= prev_cu_acc_power[cu];239		} else {240			jdelta[cu] = data->cu_acc_power[cu] - prev_cu_acc_power[cu];241		}242		tdelta = data->cpu_sw_pwr_ptsc[cu] - prev_ptsc[cu];243		jdelta[cu] *= data->cpu_pwr_sample_ratio * 1000;244		do_div(jdelta[cu], tdelta);245 246		/* the unit is microWatt */247		avg_acc += jdelta[cu];248	}249 250	return sprintf(buf, "%llu\n", (unsigned long long)avg_acc);251}252static DEVICE_ATTR_RO(power1_average);253 254static ssize_t power1_average_interval_show(struct device *dev,255					    struct device_attribute *attr,256					    char *buf)257{258	struct fam15h_power_data *data = dev_get_drvdata(dev);259 260	return sprintf(buf, "%lu\n", data->power_period);261}262 263static ssize_t power1_average_interval_store(struct device *dev,264					     struct device_attribute *attr,265					     const char *buf, size_t count)266{267	struct fam15h_power_data *data = dev_get_drvdata(dev);268	unsigned long temp;269	int ret;270 271	ret = kstrtoul(buf, 10, &temp);272	if (ret)273		return ret;274 275	if (temp > MAX_INTERVAL)276		return -EINVAL;277 278	/* the interval value should be greater than 0 */279	if (temp <= 0)280		return -EINVAL;281 282	data->power_period = temp;283 284	return count;285}286static DEVICE_ATTR_RW(power1_average_interval);287 288static int fam15h_power_init_attrs(struct pci_dev *pdev,289				   struct fam15h_power_data *data)290{291	int n = FAM15H_MIN_NUM_ATTRS;292	struct attribute **fam15h_power_attrs;293	struct cpuinfo_x86 *c = &boot_cpu_data;294 295	if (c->x86 == 0x15 &&296	    (c->x86_model <= 0xf ||297	     (c->x86_model >= 0x60 && c->x86_model <= 0x7f)))298		n += 1;299 300	/* check if processor supports accumulated power */301	if (boot_cpu_has(X86_FEATURE_ACC_POWER))302		n += 2;303 304	fam15h_power_attrs = devm_kcalloc(&pdev->dev, n,305					  sizeof(*fam15h_power_attrs),306					  GFP_KERNEL);307 308	if (!fam15h_power_attrs)309		return -ENOMEM;310 311	n = 0;312	fam15h_power_attrs[n++] = &dev_attr_power1_crit.attr;313	if (c->x86 == 0x15 &&314	    (c->x86_model <= 0xf ||315	     (c->x86_model >= 0x60 && c->x86_model <= 0x7f)))316		fam15h_power_attrs[n++] = &dev_attr_power1_input.attr;317 318	if (boot_cpu_has(X86_FEATURE_ACC_POWER)) {319		fam15h_power_attrs[n++] = &dev_attr_power1_average.attr;320		fam15h_power_attrs[n++] = &dev_attr_power1_average_interval.attr;321	}322 323	data->group.attrs = fam15h_power_attrs;324 325	return 0;326}327 328static bool should_load_on_this_node(struct pci_dev *f4)329{330	u32 val;331 332	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),333				  REG_NORTHBRIDGE_CAP, &val);334	if ((val & BIT(29)) && ((val >> 30) & 3))335		return false;336 337	return true;338}339 340/*341 * Newer BKDG versions have an updated recommendation on how to properly342 * initialize the running average range (was: 0xE, now: 0x9). This avoids343 * counter saturations resulting in bogus power readings.344 * We correct this value ourselves to cope with older BIOSes.345 */346static const struct pci_device_id affected_device[] = {347	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },348	{ 0 }349};350 351static void tweak_runavg_range(struct pci_dev *pdev)352{353	u32 val;354 355	/*356	 * let this quirk apply only to the current version of the357	 * northbridge, since future versions may change the behavior358	 */359	if (!pci_match_id(affected_device, pdev))360		return;361 362	pci_bus_read_config_dword(pdev->bus,363		PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),364		REG_TDP_RUNNING_AVERAGE, &val);365	if ((val & 0xf) != 0xe)366		return;367 368	val &= ~0xf;369	val |=  0x9;370	pci_bus_write_config_dword(pdev->bus,371		PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),372		REG_TDP_RUNNING_AVERAGE, val);373}374 375#ifdef CONFIG_PM376static int fam15h_power_resume(struct pci_dev *pdev)377{378	tweak_runavg_range(pdev);379	return 0;380}381#else382#define fam15h_power_resume NULL383#endif384 385static int fam15h_power_init_data(struct pci_dev *f4,386				  struct fam15h_power_data *data)387{388	u32 val;389	u64 tmp;390	int ret;391 392	pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);393	data->base_tdp = val >> 16;394	tmp = val & 0xffff;395 396	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),397				  REG_TDP_LIMIT3, &val);398 399	data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);400	tmp *= data->tdp_to_watts;401 402	/* result not allowed to be >= 256W */403	if ((tmp >> 16) >= 256)404		dev_warn(&f4->dev,405			 "Bogus value for ProcessorPwrWatts (processor_pwr_watts>=%u)\n",406			 (unsigned int) (tmp >> 16));407 408	/* convert to microWatt */409	data->processor_pwr_watts = (tmp * 15625) >> 10;410 411	ret = fam15h_power_init_attrs(f4, data);412	if (ret)413		return ret;414 415 416	/* CPUID Fn8000_0007:EDX[12] indicates to support accumulated power */417	if (!boot_cpu_has(X86_FEATURE_ACC_POWER))418		return 0;419 420	/*421	 * determine the ratio of the compute unit power accumulator422	 * sample period to the PTSC counter period by executing CPUID423	 * Fn8000_0007:ECX424	 */425	data->cpu_pwr_sample_ratio = cpuid_ecx(0x80000007);426 427	if (rdmsrl_safe(MSR_F15H_CU_MAX_PWR_ACCUMULATOR, &tmp)) {428		pr_err("Failed to read max compute unit power accumulator MSR\n");429		return -ENODEV;430	}431 432	data->max_cu_acc_power = tmp;433 434	/*435	 * Milliseconds are a reasonable interval for the measurement.436	 * But it shouldn't set too long here, because several seconds437	 * would cause the read function to hang. So set default438	 * interval as 10 ms.439	 */440	data->power_period = 10;441 442	return read_registers(data);443}444 445static int fam15h_power_probe(struct pci_dev *pdev,446			      const struct pci_device_id *id)447{448	struct fam15h_power_data *data;449	struct device *dev = &pdev->dev;450	struct device *hwmon_dev;451	int ret;452 453	/*454	 * though we ignore every other northbridge, we still have to455	 * do the tweaking on _each_ node in MCM processors as the counters456	 * are working hand-in-hand457	 */458	tweak_runavg_range(pdev);459 460	if (!should_load_on_this_node(pdev))461		return -ENODEV;462 463	data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);464	if (!data)465		return -ENOMEM;466 467	ret = fam15h_power_init_data(pdev, data);468	if (ret)469		return ret;470 471	data->pdev = pdev;472 473	data->groups[0] = &data->group;474 475	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "fam15h_power",476							   data,477							   &data->groups[0]);478	return PTR_ERR_OR_ZERO(hwmon_dev);479}480 481static const struct pci_device_id fam15h_power_id_table[] = {482	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },483	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },484	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },485	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M70H_NB_F4) },486	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },487	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },488	{}489};490MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);491 492static struct pci_driver fam15h_power_driver = {493	.name = "fam15h_power",494	.id_table = fam15h_power_id_table,495	.probe = fam15h_power_probe,496	.resume = fam15h_power_resume,497};498 499module_pci_driver(fam15h_power_driver);500