diff options
Diffstat (limited to 'drivers/powercap/intel_rapl.c')
| -rw-r--r-- | drivers/powercap/intel_rapl.c | 1674 |
1 files changed, 0 insertions, 1674 deletions
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c deleted file mode 100644 index 4347f15165f8..000000000000 --- a/drivers/powercap/intel_rapl.c +++ /dev/null @@ -1,1674 +0,0 @@ -/* - * Intel Running Average Power Limit (RAPL) Driver - * Copyright (c) 2013, Intel Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc. - * - */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/list.h> -#include <linux/types.h> -#include <linux/device.h> -#include <linux/slab.h> -#include <linux/log2.h> -#include <linux/bitmap.h> -#include <linux/delay.h> -#include <linux/sysfs.h> -#include <linux/cpu.h> -#include <linux/powercap.h> -#include <linux/suspend.h> -#include <asm/iosf_mbi.h> - -#include <asm/processor.h> -#include <asm/cpu_device_id.h> -#include <asm/intel-family.h> - -/* Local defines */ -#define MSR_PLATFORM_POWER_LIMIT 0x0000065C - -/* bitmasks for RAPL MSRs, used by primitive access functions */ -#define ENERGY_STATUS_MASK 0xffffffff - -#define POWER_LIMIT1_MASK 0x7FFF -#define POWER_LIMIT1_ENABLE BIT(15) -#define POWER_LIMIT1_CLAMP BIT(16) - -#define POWER_LIMIT2_MASK (0x7FFFULL<<32) -#define POWER_LIMIT2_ENABLE BIT_ULL(47) -#define POWER_LIMIT2_CLAMP BIT_ULL(48) -#define POWER_PACKAGE_LOCK BIT_ULL(63) -#define POWER_PP_LOCK BIT(31) - -#define TIME_WINDOW1_MASK (0x7FULL<<17) -#define TIME_WINDOW2_MASK (0x7FULL<<49) - -#define POWER_UNIT_OFFSET 0 -#define POWER_UNIT_MASK 0x0F - -#define ENERGY_UNIT_OFFSET 0x08 -#define ENERGY_UNIT_MASK 0x1F00 - -#define TIME_UNIT_OFFSET 0x10 -#define TIME_UNIT_MASK 0xF0000 - -#define POWER_INFO_MAX_MASK (0x7fffULL<<32) -#define POWER_INFO_MIN_MASK (0x7fffULL<<16) -#define POWER_INFO_MAX_TIME_WIN_MASK (0x3fULL<<48) -#define POWER_INFO_THERMAL_SPEC_MASK 0x7fff - -#define PERF_STATUS_THROTTLE_TIME_MASK 0xffffffff -#define PP_POLICY_MASK 0x1F - -/* Non HW constants */ -#define RAPL_PRIMITIVE_DERIVED BIT(1) /* not from raw data */ -#define RAPL_PRIMITIVE_DUMMY BIT(2) - -#define TIME_WINDOW_MAX_MSEC 40000 -#define TIME_WINDOW_MIN_MSEC 250 -#define ENERGY_UNIT_SCALE 1000 /* scale from driver unit to powercap unit */ -enum unit_type { - ARBITRARY_UNIT, /* no translation */ - POWER_UNIT, - ENERGY_UNIT, - TIME_UNIT, -}; - -enum rapl_domain_type { - RAPL_DOMAIN_PACKAGE, /* entire package/socket */ - RAPL_DOMAIN_PP0, /* core power plane */ - RAPL_DOMAIN_PP1, /* graphics uncore */ - RAPL_DOMAIN_DRAM,/* DRAM control_type */ - RAPL_DOMAIN_PLATFORM, /* PSys control_type */ - RAPL_DOMAIN_MAX, -}; - -enum rapl_domain_msr_id { - RAPL_DOMAIN_MSR_LIMIT, - RAPL_DOMAIN_MSR_STATUS, - RAPL_DOMAIN_MSR_PERF, - RAPL_DOMAIN_MSR_POLICY, - RAPL_DOMAIN_MSR_INFO, - RAPL_DOMAIN_MSR_MAX, -}; - -/* per domain data, some are optional */ -enum rapl_primitives { - ENERGY_COUNTER, - POWER_LIMIT1, - POWER_LIMIT2, - FW_LOCK, - - PL1_ENABLE, /* power limit 1, aka long term */ - PL1_CLAMP, /* allow frequency to go below OS request */ - PL2_ENABLE, /* power limit 2, aka short term, instantaneous */ - PL2_CLAMP, - - TIME_WINDOW1, /* long term */ - TIME_WINDOW2, /* short term */ - THERMAL_SPEC_POWER, - MAX_POWER, - - MIN_POWER, - MAX_TIME_WINDOW, - THROTTLED_TIME, - PRIORITY_LEVEL, - - /* below are not raw primitive data */ - AVERAGE_POWER, - NR_RAPL_PRIMITIVES, -}; - -#define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2) - -/* Can be expanded to include events, etc.*/ -struct rapl_domain_data { - u64 primitives[NR_RAPL_PRIMITIVES]; - unsigned long timestamp; -}; - -struct msrl_action { - u32 msr_no; - u64 clear_mask; - u64 set_mask; - int err; -}; - -#define DOMAIN_STATE_INACTIVE BIT(0) -#define DOMAIN_STATE_POWER_LIMIT_SET BIT(1) -#define DOMAIN_STATE_BIOS_LOCKED BIT(2) - -#define NR_POWER_LIMITS (2) -struct rapl_power_limit { - struct powercap_zone_constraint *constraint; - int prim_id; /* primitive ID used to enable */ - struct rapl_domain *domain; - const char *name; - u64 last_power_limit; -}; - -static const char pl1_name[] = "long_term"; -static const char pl2_name[] = "short_term"; - -struct rapl_package; -struct rapl_domain { - const char *name; - enum rapl_domain_type id; - int msrs[RAPL_DOMAIN_MSR_MAX]; - struct powercap_zone power_zone; - struct rapl_domain_data rdd; - struct rapl_power_limit rpl[NR_POWER_LIMITS]; - u64 attr_map; /* track capabilities */ - unsigned int state; - unsigned int domain_energy_unit; - struct rapl_package *rp; -}; -#define power_zone_to_rapl_domain(_zone) \ - container_of(_zone, struct rapl_domain, power_zone) - - -/* Each physical package contains multiple domains, these are the common - * data across RAPL domains within a package. - */ -struct rapl_package { - unsigned int id; /* physical package/socket id */ - unsigned int nr_domains; - unsigned long domain_map; /* bit map of active domains */ - unsigned int power_unit; - unsigned int energy_unit; - unsigned int time_unit; - struct rapl_domain *domains; /* array of domains, sized at runtime */ - struct powercap_zone *power_zone; /* keep track of parent zone */ - unsigned long power_limit_irq; /* keep track of package power limit - * notify interrupt enable status. - */ - struct list_head plist; - int lead_cpu; /* one active cpu per package for access */ - /* Track active cpus */ - struct cpumask cpumask; -}; - -struct rapl_defaults { - u8 floor_freq_reg_addr; - int (*check_unit)(struct rapl_package *rp, int cpu); - void (*set_floor_freq)(struct rapl_domain *rd, bool mode); - u64 (*compute_time_window)(struct rapl_package *rp, u64 val, - bool to_raw); - unsigned int dram_domain_energy_unit; -}; -static struct rapl_defaults *rapl_defaults; - -/* Sideband MBI registers */ -#define IOSF_CPU_POWER_BUDGET_CTL_BYT (0x2) -#define IOSF_CPU_POWER_BUDGET_CTL_TNG (0xdf) - -#define PACKAGE_PLN_INT_SAVED BIT(0) -#define MAX_PRIM_NAME (32) - -/* per domain data. used to describe individual knobs such that access function - * can be consolidated into one instead of many inline functions. - */ -struct rapl_primitive_info { - const char *name; - u64 mask; - int shift; - enum rapl_domain_msr_id id; - enum unit_type unit; - u32 flag; -}; - -#define PRIMITIVE_INFO_INIT(p, m, s, i, u, f) { \ - .name = #p, \ - .mask = m, \ - .shift = s, \ - .id = i, \ - .unit = u, \ - .flag = f \ - } - -static void rapl_init_domains(struct rapl_package *rp); -static int rapl_read_data_raw(struct rapl_domain *rd, - enum rapl_primitives prim, - bool xlate, u64 *data); -static int rapl_write_data_raw(struct rapl_domain *rd, - enum rapl_primitives prim, - unsigned long long value); -static u64 rapl_unit_xlate(struct rapl_domain *rd, - enum unit_type type, u64 value, - int to_raw); -static void package_power_limit_irq_save(struct rapl_package *rp); - -static LIST_HEAD(rapl_packages); /* guarded by CPU hotplug lock */ - -static const char * const rapl_domain_names[] = { - "package", - "core", - "uncore", - "dram", - "psys", -}; - -static struct powercap_control_type *control_type; /* PowerCap Controller */ -static struct rapl_domain *platform_rapl_domain; /* Platform (PSys) domain */ - -/* caller to ensure CPU hotplug lock is held */ -static struct rapl_package *find_package_by_id(int id) -{ - struct rapl_package *rp; - - list_for_each_entry(rp, &rapl_packages, plist) { - if (rp->id == id) - return rp; - } - - return NULL; -} - -static int get_energy_counter(struct powercap_zone *power_zone, u64 *energy_raw) -{ - struct rapl_domain *rd; - u64 energy_now; - - /* prevent CPU hotplug, make sure the RAPL domain does not go - * away while reading the counter. - */ - get_online_cpus(); - rd = power_zone_to_rapl_domain(power_zone); - - if (!rapl_read_data_raw(rd, ENERGY_COUNTER, true, &energy_now)) { - *energy_raw = energy_now; - put_online_cpus(); - - return 0; - } - put_online_cpus(); - - return -EIO; -} - -static int get_max_energy_counter(struct powercap_zone *pcd_dev, u64 *energy) -{ - struct rapl_domain *rd = power_zone_to_rapl_domain(pcd_dev); - - *energy = rapl_unit_xlate(rd, ENERGY_UNIT, ENERGY_STATUS_MASK, 0); - return 0; -} - -static int release_zone(struct powercap_zone *power_zone) -{ - struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone); - struct rapl_package *rp = rd->rp; - - /* package zone is the last zone of a package, we can free - * memory here since all children has been unregistered. - */ - if (rd->id == RAPL_DOMAIN_PACKAGE) { - kfree(rd); - rp->domains = NULL; - } - - return 0; - -} - -static int find_nr_power_limit(struct rapl_domain *rd) -{ - int i, nr_pl = 0; - - for (i = 0; i < NR_POWER_LIMITS; i++) { - if (rd->rpl[i].name) - nr_pl++; - } - - return nr_pl; -} - -static int set_domain_enable(struct powercap_zone *power_zone, bool mode) -{ - struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone); - - if (rd->state & DOMAIN_STATE_BIOS_LOCKED) - return -EACCES; - - get_online_cpus(); - rapl_write_data_raw(rd, PL1_ENABLE, mode); - if (rapl_defaults->set_floor_freq) - rapl_defaults->set_floor_freq(rd, mode); - put_online_cpus(); - - return 0; -} - -static int get_domain_enable(struct powercap_zone *power_zone, bool *mode) -{ - struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone); - u64 val; - - if (rd->state & DOMAIN_STATE_BIOS_LOCKED) { - *mode = false; - return 0; - } - get_online_cpus(); - if (rapl_read_data_raw(rd, PL1_ENABLE, true, &val)) { - put_online_cpus(); - return -EIO; - } - *mode = val; - put_online_cpus(); - - return 0; -} - -/* per RAPL domain ops, in the order of rapl_domain_type */ -static const struct powercap_zone_ops zone_ops[] = { - /* RAPL_DOMAIN_PACKAGE */ - { - .get_energy_uj = get_energy_counter, - .get_max_energy_range_uj = get_max_energy_counter, - .release = release_zone, - .set_enable = set_domain_enable, - .get_enable = get_domain_enable, - }, - /* RAPL_DOMAIN_PP0 */ - { - .get_energy_uj = get_energy_counter, - .get_max_energy_range_uj = get_max_energy_counter, - .release = release_zone, - .set_enable = set_domain_enable, - .get_enable = get_domain_enable, - }, - /* RAPL_DOMAIN_PP1 */ - { - .get_energy_uj = get_energy_counter, - .get_max_energy_range_uj = get_max_energy_counter, - .release = release_zone, - .set_enable = set_domain_enable, - .get_enable = get_domain_enable, - }, - /* RAPL_DOMAIN_DRAM */ - { - .get_energy_uj = get_energy_counter, - .get_max_energy_range_uj = get_max_energy_counter, - .release = release_zone, - .set_enable = set_domain_enable, - .get_enable = get_domain_enable, - }, - /* RAPL_DOMAIN_PLATFORM */ - { - .get_energy_uj = get_energy_counter, - .get_max_energy_range_uj = get_max_energy_counter, - .release = release_zone, - .set_enable = set_domain_enable, - .get_enable = get_domain_enable, - }, -}; - - -/* - * Constraint index used by powercap can be different than power limit (PL) - * index in that some PLs maybe missing due to non-existant MSRs. So we - * need to convert here by finding the valid PLs only (name populated). - */ -static int contraint_to_pl(struct rapl_domain *rd, int cid) -{ - int i, j; - - for (i = 0, j = 0; i < NR_POWER_LIMITS; i++) { - if ((rd->rpl[i].name) && j++ == cid) { - pr_debug("%s: index %d\n", __func__, i); - return i; - } - } - pr_err("Cannot find matching power limit for constraint %d\n", cid); - - return -EINVAL; -} - -static int set_power_limit(struct powercap_zone *power_zone, int cid, - u64 power_limit) -{ - struct rapl_domain *rd; - struct rapl_package *rp; - int ret = 0; - int id; - - get_online_cpus(); - rd = power_zone_to_rapl_domain(power_zone); - id = contraint_to_pl(rd, cid); - if (id < 0) { - ret = id; - goto set_exit; - } - - rp = rd->rp; - - if (rd->state & DOMAIN_STATE_BIOS_LOCKED) { - dev_warn(&power_zone->dev, "%s locked by BIOS, monitoring only\n", - rd->name); - ret = -EACCES; - goto set_exit; - } - - switch (rd->rpl[id].prim_id) { - case PL1_ENABLE: - rapl_write_data_raw(rd, POWER_LIMIT1, power_limit); - break; - case PL2_ENABLE: - rapl_write_data_raw(rd, POWER_LIMIT2, power_limit); - break; - default: - ret = -EINVAL; - } - if (!ret) - package_power_limit_irq_save(rp); -set_exit: - put_online_cpus(); - return ret; -} - -static int get_current_power_limit(struct powercap_zone *power_zone, int cid, - u64 *data) -{ - struct rapl_domain *rd; - u64 val; - int prim; - int ret = 0; - int id; - - get_online_cpus(); - rd = power_zone_to_rapl_domain(power_zone); - id = contraint_to_pl(rd, cid); - if (id < 0) { - ret = id; - goto get_exit; - } - - switch (rd->rpl[id].prim_id) { - case PL1_ENABLE: - prim = POWER_LIMIT1; - break; - case PL2_ENABLE: - prim = POWER_LIMIT2; - break; - default: - put_online_cpus(); - return -EINVAL; - } - if (rapl_read_data_raw(rd, prim, true, &val)) - ret = -EIO; - else - *data = val; - -get_exit: - put_online_cpus(); - - return ret; -} - -static int set_time_window(struct powercap_zone *power_zone, int cid, - u64 window) -{ - struct rapl_domain *rd; - int ret = 0; - int id; - - get_online_cpus(); - rd = power_zone_to_rapl_domain(power_zone); - id = contraint_to_pl(rd, cid); - if (id < 0) { - ret = id; - goto set_time_exit; - } - - switch (rd->rpl[id].prim_id) { - case PL1_ENABLE: - rapl_write_data_raw(rd, TIME_WINDOW1, window); - break; - case PL2_ENABLE: - rapl_write_data_raw(rd, TIME_WINDOW2, window); - break; - default: - ret = -EINVAL; - } - -set_time_exit: - put_online_cpus(); - return ret; -} - -static int get_time_window(struct powercap_zone *power_zone, int cid, u64 *data) -{ - struct rapl_domain *rd; - u64 val; - int ret = 0; - int id; - - get_online_cpus(); - rd = power_zone_to_rapl_domain(power_zone); - id = contraint_to_pl(rd, cid); - if (id < 0) { - ret = id; - goto get_time_exit; - } - - switch (rd->rpl[id].prim_id) { - case PL1_ENABLE: - ret = rapl_read_data_raw(rd, TIME_WINDOW1, true, &val); - break; - case PL2_ENABLE: - ret = rapl_read_data_raw(rd, TIME_WINDOW2, true, &val); - break; - default: - put_online_cpus(); - return -EINVAL; - } - if (!ret) - *data = val; - -get_time_exit: - put_online_cpus(); - - return ret; -} - -static const char *get_constraint_name(struct powercap_zone *power_zone, int cid) -{ - struct rapl_domain *rd; - int id; - - rd = power_zone_to_rapl_domain(power_zone); - id = contraint_to_pl(rd, cid); - if (id >= 0) - return rd->rpl[id].name; - - return NULL; -} - - -static int get_max_power(struct powercap_zone *power_zone, int id, - u64 *data) -{ - struct rapl_domain *rd; - u64 val; - int prim; - int ret = 0; - - get_online_cpus(); - rd = power_zone_to_rapl_domain(power_zone); - switch (rd->rpl[id].prim_id) { - case PL1_ENABLE: - prim = THERMAL_SPEC_POWER; - break; - case PL2_ENABLE: - prim = MAX_POWER; - break; - default: - put_online_cpus(); - return -EINVAL; - } - if (rapl_read_data_raw(rd, prim, true, &val)) - ret = -EIO; - else - *data = val; - - put_online_cpus(); - - return ret; -} - -static const struct powercap_zone_constraint_ops constraint_ops = { - .set_power_limit_uw = set_power_limit, - .get_power_limit_uw = get_current_power_limit, - .set_time_window_us = set_time_window, - .get_time_window_us = get_time_window, - .get_max_power_uw = get_max_power, - .get_name = get_constraint_name, -}; - -/* called after domain detection and package level data are set */ -static void rapl_init_domains(struct rapl_package *rp) -{ - int i; - struct rapl_domain *rd = rp->domains; - - for (i = 0; i < RAPL_DOMAIN_MAX; i++) { - unsigned int mask = rp->domain_map & (1 << i); - switch (mask) { - case BIT(RAPL_DOMAIN_PACKAGE): - rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE]; - rd->id = RAPL_DOMAIN_PACKAGE; - rd->msrs[0] = MSR_PKG_POWER_LIMIT; - rd->msrs[1] = MSR_PKG_ENERGY_STATUS; - rd->msrs[2] = MSR_PKG_PERF_STATUS; - rd->msrs[3] = 0; - rd->msrs[4] = MSR_PKG_POWER_INFO; - rd->rpl[0].prim_id = PL1_ENABLE; - rd->rpl[0].name = pl1_name; - rd->rpl[1].prim_id = PL2_ENABLE; - rd->rpl[1].name = pl2_name; - break; - case BIT(RAPL_DOMAIN_PP0): - rd->name = rapl_domain_names[RAPL_DOMAIN_PP0]; - rd->id = RAPL_DOMAIN_PP0; - rd->msrs[0] = MSR_PP0_POWER_LIMIT; - rd->msrs[1] = MSR_PP0_ENERGY_STATUS; - rd->msrs[2] = 0; - rd->msrs[3] = MSR_PP0_POLICY; - rd->msrs[4] = 0; - rd->rpl[0].prim_id = PL1_ENABLE; - rd->rpl[0].name = pl1_name; - break; - case BIT(RAPL_DOMAIN_PP1): - rd->name = rapl_domain_names[RAPL_DOMAIN_PP1]; - rd->id = RAPL_DOMAIN_PP1; - rd->msrs[0] = MSR_PP1_POWER_LIMIT; - rd->msrs[1] = MSR_PP1_ENERGY_STATUS; - rd->msrs[2] = 0; - rd->msrs[3] = MSR_PP1_POLICY; - rd->msrs[4] = 0; - rd->rpl[0].prim_id = PL1_ENABLE; - rd->rpl[0].name = pl1_name; - break; - case BIT(RAPL_DOMAIN_DRAM): - rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM]; - rd->id = RAPL_DOMAIN_DRAM; - rd->msrs[0] = MSR_DRAM_POWER_LIMIT; - rd->msrs[1] = MSR_DRAM_ENERGY_STATUS; - rd->msrs[2] = MSR_DRAM_PERF_STATUS; - rd->msrs[3] = 0; - rd->msrs[4] = MSR_DRAM_POWER_INFO; - rd->rpl[0].prim_id = PL1_ENABLE; - rd->rpl[0].name = pl1_name; - rd->domain_energy_unit = - rapl_defaults->dram_domain_energy_unit; - if (rd->domain_energy_unit) - pr_info("DRAM domain energy unit %dpj\n", - rd->domain_energy_unit); - break; - } - if (mask) { - rd->rp = rp; - rd++; - } - } -} - -static u64 rapl_unit_xlate(struct rapl_domain *rd, enum unit_type type, - u64 value, int to_raw) -{ - u64 units = 1; - struct rapl_package *rp = rd->rp; - u64 scale = 1; - - switch (type) { - case POWER_UNIT: - units = rp->power_unit; - break; - case ENERGY_UNIT: - scale = ENERGY_UNIT_SCALE; - /* per domain unit takes precedence */ - if (rd->domain_energy_unit) - units = rd->domain_energy_unit; - else - units = rp->energy_unit; - break; - case TIME_UNIT: - return rapl_defaults->compute_time_window(rp, value, to_raw); - case ARBITRARY_UNIT: - default: - return value; - }; - - if (to_raw) - return div64_u64(value, units) * scale; - - value *= units; - - return div64_u64(value, scale); -} - -/* in the order of enum rapl_primitives */ -static struct rapl_primitive_info rpi[] = { - /* name, mask, shift, msr index, unit divisor */ - PRIMITIVE_INFO_INIT(ENERGY_COUNTER, ENERGY_STATUS_MASK, 0, - RAPL_DOMAIN_MSR_STATUS, ENERGY_UNIT, 0), - PRIMITIVE_INFO_INIT(POWER_LIMIT1, POWER_LIMIT1_MASK, 0, - RAPL_DOMAIN_MSR_LIMIT, POWER_UNIT, 0), - PRIMITIVE_INFO_INIT(POWER_LIMIT2, POWER_LIMIT2_MASK, 32, - RAPL_DOMAIN_MSR_LIMIT, POWER_UNIT, 0), - PRIMITIVE_INFO_INIT(FW_LOCK, POWER_PP_LOCK, 31, - RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), - PRIMITIVE_INFO_INIT(PL1_ENABLE, POWER_LIMIT1_ENABLE, 15, - RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), - PRIMITIVE_INFO_INIT(PL1_CLAMP, POWER_LIMIT1_CLAMP, 16, - RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), - PRIMITIVE_INFO_INIT(PL2_ENABLE, POWER_LIMIT2_ENABLE, 47, - RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), - PRIMITIVE_INFO_INIT(PL2_CLAMP, POWER_LIMIT2_CLAMP, 48, - RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), - PRIMITIVE_INFO_INIT(TIME_WINDOW1, TIME_WINDOW1_MASK, 17, - RAPL_DOMAIN_MSR_LIMIT, TIME_UNIT, 0), - PRIMITIVE_INFO_INIT(TIME_WINDOW2, TIME_WINDOW2_MASK, 49, - RAPL_DOMAIN_MSR_LIMIT, TIME_UNIT, 0), - PRIMITIVE_INFO_INIT(THERMAL_SPEC_POWER, POWER_INFO_THERMAL_SPEC_MASK, - 0, RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0), - PRIMITIVE_INFO_INIT(MAX_POWER, POWER_INFO_MAX_MASK, 32, - RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0), - PRIMITIVE_INFO_INIT(MIN_POWER, POWER_INFO_MIN_MASK, 16, - RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0), - PRIMITIVE_INFO_INIT(MAX_TIME_WINDOW, POWER_INFO_MAX_TIME_WIN_MASK, 48, - RAPL_DOMAIN_MSR_INFO, TIME_UNIT, 0), - PRIMITIVE_INFO_INIT(THROTTLED_TIME, PERF_STATUS_THROTTLE_TIME_MASK, 0, - RAPL_DOMAIN_MSR_PERF, TIME_UNIT, 0), - PRIMITIVE_INFO_INIT(PRIORITY_LEVEL, PP_POLICY_MASK, 0, - RAPL_DOMAIN_MSR_POLICY, ARBITRARY_UNIT, 0), - /* non-hardware */ - PRIMITIVE_INFO_INIT(AVERAGE_POWER, 0, 0, 0, POWER_UNIT, - RAPL_PRIMITIVE_DERIVED), - {NULL, 0, 0, 0}, -}; - -/* Read primitive data based on its related struct rapl_primitive_info. - * if xlate flag is set, return translated data based on data units, i.e. - * time, energy, and power. - * RAPL MSRs are non-architectual and are laid out not consistently across - * domains. Here we use primitive info to allow writing consolidated access - * functions. - * For a given primitive, it is processed by MSR mask and shift. Unit conversion - * is pre-assigned based on RAPL unit MSRs read at init time. - * 63-------------------------- 31--------------------------- 0 - * | xxxxx (mask) | - * | |<- shift ----------------| - * 63-------------------------- 31--------------------------- 0 - */ -static int rapl_read_data_raw(struct rapl_domain *rd, - enum rapl_primitives prim, - bool xlate, u64 *data) -{ - u64 value, final; - u32 msr; - struct rapl_primitive_info *rp = &rpi[prim]; - int cpu; - - if (!rp->name || rp->flag & RAPL_PRIMITIVE_DUMMY) - return -EINVAL; - - msr = rd->msrs[rp->id]; - if (!msr) - return -EINVAL; - - cpu = rd->rp->lead_cpu; - - /* special-case package domain, which uses a different bit*/ - if (prim == FW_LOCK && rd->id == RAPL_DOMAIN_PACKAGE) { - rp->mask = POWER_PACKAGE_LOCK; - rp->shift = 63; - } - /* non-hardware data are collected by the polling thread */ - if (rp->flag & RAPL_PRIMITIVE_DERIVED) { - *data = rd->rdd.primitives[prim]; - return 0; - } - - if (rdmsrl_safe_on_cpu(cpu, msr, &value)) { - pr_debug("failed to read msr 0x%x on cpu %d\n", msr, cpu); - return -EIO; - } - - final = value & rp->mask; - final = final >> rp->shift; - if (xlate) - *data = rapl_unit_xlate(rd, rp->unit, final, 0); - else - *data = final; - - return 0; -} - - -static int msrl_update_safe(u32 msr_no, u64 clear_mask, u64 set_mask) -{ - int err; - u64 val; - - err = rdmsrl_safe(msr_no, &val); - if (err) - goto out; - - val &= ~clear_mask; - val |= set_mask; - - err = wrmsrl_safe(msr_no, val); - -out: - return err; -} - -static void msrl_update_func(void *info) -{ - struct msrl_action *ma = info; - - ma->err = msrl_update_safe(ma->msr_no, ma->clear_mask, ma->set_mask); -} - -/* Similar use of primitive info in the read counterpart */ -static int rapl_write_data_raw(struct rapl_domain *rd, - enum rapl_primitives prim, - unsigned long long value) -{ - struct rapl_primitive_info *rp = &rpi[prim]; - int cpu; - u64 bits; - struct msrl_action ma; - int ret; - - cpu = rd->rp->lead_cpu; - bits = rapl_unit_xlate(rd, rp->unit, value, 1); - bits <<= rp->shift; - bits &= rp->mask; - - memset(&ma, 0, sizeof(ma)); - - ma.msr_no = rd->msrs[rp->id]; - ma.clear_mask = rp->mask; - ma.set_mask = bits; - - ret = smp_call_function_single(cpu, msrl_update_func, &ma, 1); - if (ret) - WARN_ON_ONCE(ret); - else - ret = ma.err; - - return ret; -} - -/* - * Raw RAPL data stored in MSRs are in certain scales. We need to - * convert them into standard units based on the units reported in - * the RAPL unit MSRs. This is specific to CPUs as the method to - * calculate units differ on different CPUs. - * We convert the units to below format based on CPUs. - * i.e. - * energy unit: picoJoules : Represented in picoJoules by default - * power unit : microWatts : Represented in milliWatts by default - * time unit : microseconds: Represented in seconds by default - */ -static int rapl_check_unit_core(struct rapl_package *rp, int cpu) -{ - u64 msr_val; - u32 value; - - if (rdmsrl_safe_on_cpu(cpu, MSR_RAPL_POWER_UNIT, &msr_val)) { - pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n", - MSR_RAPL_POWER_UNIT, cpu); - return -ENODEV; - } - - value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET; - rp->energy_unit = ENERGY_UNIT_SCALE * 1000000 / (1 << value); - - value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET; - rp->power_unit = 1000000 / (1 << value); - - value = (msr_val & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET; - rp->time_unit = 1000000 / (1 << value); - - pr_debug("Core CPU package %d energy=%dpJ, time=%dus, power=%duW\n", - rp->id, rp->energy_unit, rp->time_unit, rp->power_unit); - - return 0; -} - -static int rapl_check_unit_atom(struct rapl_package *rp, int cpu) -{ - u64 msr_val; - u32 value; - - if (rdmsrl_safe_on_cpu(cpu, MSR_RAPL_POWER_UNIT, &msr_val)) { - pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n", - MSR_RAPL_POWER_UNIT, cpu); - return -ENODEV; - } - value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET; - rp->energy_unit = ENERGY_UNIT_SCALE * 1 << value; - - value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET; - rp->power_unit = (1 << value) * 1000; - - value = (msr_val & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET; - rp->time_unit = 1000000 / (1 << value); - - pr_debug("Atom package %d energy=%dpJ, time=%dus, power=%duW\n", - rp->id, rp->energy_unit, rp->time_unit, rp->power_unit); - - return 0; -} - -static void power_limit_irq_save_cpu(void *info) -{ - u32 l, h = 0; - struct rapl_package *rp = (struct rapl_package *)info; - - /* save the state of PLN irq mask bit before disabling it */ - rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h); - if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) { - rp->power_limit_irq = l & PACKAGE_THERM_INT_PLN_ENABLE; - rp->power_limit_irq |= PACKAGE_PLN_INT_SAVED; - } - l &= ~PACKAGE_THERM_INT_PLN_ENABLE; - wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); -} - - -/* REVISIT: - * When package power limit is set artificially low by RAPL, LVT - * thermal interrupt for package power limit should be ignored - * since we are not really exceeding the real limit. The intention - * is to avoid excessive interrupts while we are trying to save power. - * A useful feature might be routing the package_power_limit interrupt - * to userspace via eventfd. once we have a usecase, this is simple - * to do by adding an atomic notifier. - */ - -static void package_power_limit_irq_save(struct rapl_package *rp) -{ - if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN)) - return; - - smp_call_function_single(rp->lead_cpu, power_limit_irq_save_cpu, rp, 1); -} - -/* - * Restore per package power limit interrupt enable state. Called from cpu - * hotplug code on package removal. - */ -static void package_power_limit_irq_restore(struct rapl_package *rp) -{ - u32 l, h; - - if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN)) - return; - - /* irq enable state not saved, nothing to restore */ - if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) - return; - - rdmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h); - - if (rp->power_limit_irq & PACKAGE_THERM_INT_PLN_ENABLE) - l |= PACKAGE_THERM_INT_PLN_ENABLE; - else - l &= ~PACKAGE_THERM_INT_PLN_ENABLE; - - wrmsr_safe(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); -} - -static void set_floor_freq_default(struct rapl_domain *rd, bool mode) -{ - int nr_powerlimit = find_nr_power_limit(rd); - - /* always enable clamp such that p-state can go below OS requested - * range. power capping priority over guranteed frequency. - */ - rapl_write_data_raw(rd, PL1_CLAMP, mode); - - /* some domains have pl2 */ - if (nr_powerlimit > 1) { - rapl_write_data_raw(rd, PL2_ENABLE, mode); - rapl_write_data_raw(rd, PL2_CLAMP, mode); - } -} - -static void set_floor_freq_atom(struct rapl_domain *rd, bool enable) -{ - static u32 power_ctrl_orig_val; - u32 mdata; - - if (!rapl_defaults->floor_freq_reg_addr) { - pr_err("Invalid floor frequency config register\n"); - return; - } - - if (!power_ctrl_orig_val) - iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_CR_READ, - rapl_defaults->floor_freq_reg_addr, - &power_ctrl_orig_val); - mdata = power_ctrl_orig_val; - if (enable) { - mdata &= ~(0x7f << 8); - mdata |= 1 << 8; - } - iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_CR_WRITE, - rapl_defaults->floor_freq_reg_addr, mdata); -} - -static u64 rapl_compute_time_window_core(struct rapl_package *rp, u64 value, - bool to_raw) -{ - u64 f, y; /* fraction and exp. used for time unit */ - - /* - * Special processing based on 2^Y*(1+F/4), refer - * to Intel Software Developer's manual Vol.3B: CH 14.9.3. - */ - if (!to_raw) { - f = (value & 0x60) >> 5; - y = value & 0x1f; - value = (1 << y) * (4 + f) * rp->time_unit / 4; - } else { - do_div(value, rp->time_unit); - y = ilog2(value); - f = div64_u64(4 * (value - (1 << y)), 1 << y); - value = (y & 0x1f) | ((f & 0x3) << 5); - } - return value; -} - -static u64 rapl_compute_time_window_atom(struct rapl_package *rp, u64 value, - bool to_raw) -{ - /* - * Atom time unit encoding is straight forward val * time_unit, - * where time_unit is default to 1 sec. Never 0. - */ - if (!to_raw) - return (value) ? value *= rp->time_unit : rp->time_unit; - else - value = div64_u64(value, rp->time_unit); - - return value; -} - -static const struct rapl_defaults rapl_defaults_core = { - .floor_freq_reg_addr = 0, - .check_unit = rapl_check_unit_core, - .set_floor_freq = set_floor_freq_default, - .compute_time_window = rapl_compute_time_window_core, -}; - -static const struct rapl_defaults rapl_defaults_hsw_server = { - .check_unit = rapl_check_unit_core, - .set_floor_freq = set_floor_freq_default, - .compute_time_window = rapl_compute_time_window_core, - .dram_domain_energy_unit = 15300, -}; - -static const struct rapl_defaults rapl_defaults_byt = { - .floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_BYT, - .check_unit = rapl_check_unit_atom, - .set_floor_freq = set_floor_freq_atom, - .compute_time_window = rapl_compute_time_window_atom, -}; - -static const struct rapl_defaults rapl_defaults_tng = { - .floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_TNG, - .check_unit = rapl_check_unit_atom, - .set_floor_freq = set_floor_freq_atom, - .compute_time_window = rapl_compute_time_window_atom, -}; - -static const struct rapl_defaults rapl_defaults_ann = { - .floor_freq_reg_addr = 0, - .check_unit = rapl_check_unit_atom, - .set_floor_freq = NULL, - .compute_time_window = rapl_compute_time_window_atom, -}; - -static const struct rapl_defaults rapl_defaults_cht = { - .floor_freq_reg_addr = 0, - .check_unit = rapl_check_unit_atom, - .set_floor_freq = NULL, - .compute_time_window = rapl_compute_time_window_atom, -}; - -static const struct x86_cpu_id rapl_ids[] __initconst = { - INTEL_CPU_FAM6(SANDYBRIDGE, rapl_defaults_core), - INTEL_CPU_FAM6(SANDYBRIDGE_X, rapl_defaults_core), - - INTEL_CPU_FAM6(IVYBRIDGE, rapl_defaults_core), - INTEL_CPU_FAM6(IVYBRIDGE_X, rapl_defaults_core), - - INTEL_CPU_FAM6(HASWELL_CORE, rapl_defaults_core), - INTEL_CPU_FAM6(HASWELL_ULT, rapl_defaults_core), - INTEL_CPU_FAM6(HASWELL_GT3E, rapl_defaults_core), - INTEL_CPU_FAM6(HASWELL_X, rapl_defaults_hsw_server), - - INTEL_CPU_FAM6(BROADWELL_CORE, rapl_defaults_core), - INTEL_CPU_FAM6(BROADWELL_GT3E, rapl_defaults_core), - INTEL_CPU_FAM6(BROADWELL_XEON_D, rapl_defaults_core), - INTEL_CPU_FAM6(BROADWELL_X, rapl_defaults_hsw_server), - - INTEL_CPU_FAM6(SKYLAKE_DESKTOP, rapl_defaults_core), - INTEL_CPU_FAM6(SKYLAKE_MOBILE, rapl_defaults_core), - INTEL_CPU_FAM6(SKYLAKE_X, rapl_defaults_hsw_server), - INTEL_CPU_FAM6(KABYLAKE_MOBILE, rapl_defaults_core), - INTEL_CPU_FAM6(KABYLAKE_DESKTOP, rapl_defaults_core), - INTEL_CPU_FAM6(CANNONLAKE_MOBILE, rapl_defaults_core), - INTEL_CPU_FAM6(ICELAKE_MOBILE, rapl_defaults_core), - - INTEL_CPU_FAM6(ATOM_SILVERMONT, rapl_defaults_byt), - INTEL_CPU_FAM6(ATOM_AIRMONT, rapl_defaults_cht), - INTEL_CPU_FAM6(ATOM_SILVERMONT_MID, rapl_defaults_tng), - INTEL_CPU_FAM6(ATOM_AIRMONT_MID, rapl_defaults_ann), - INTEL_CPU_FAM6(ATOM_GOLDMONT, rapl_defaults_core), - INTEL_CPU_FAM6(ATOM_GOLDMONT_PLUS, rapl_defaults_core), - INTEL_CPU_FAM6(ATOM_GOLDMONT_X, rapl_defaults_core), - INTEL_CPU_FAM6(ATOM_TREMONT_X, rapl_defaults_core), - - INTEL_CPU_FAM6(XEON_PHI_KNL, rapl_defaults_hsw_server), - INTEL_CPU_FAM6(XEON_PHI_KNM, rapl_defaults_hsw_server), - {} -}; -MODULE_DEVICE_TABLE(x86cpu, rapl_ids); - -/* Read once for all raw primitive data for domains */ -static void rapl_update_domain_data(struct rapl_package *rp) -{ - int dmn, prim; - u64 val; - - for (dmn = 0; dmn < rp->nr_domains; dmn++) { - pr_debug("update package %d domain %s data\n", rp->id, - rp->domains[dmn].name); - /* exclude non-raw primitives */ - for (prim = 0; prim < NR_RAW_PRIMITIVES; prim++) { - if (!rapl_read_data_raw(&rp->domains[dmn], prim, - rpi[prim].unit, &val)) - rp->domains[dmn].rdd.primitives[prim] = val; - } - } - -} - -static void rapl_unregister_powercap(void) -{ - if (platform_rapl_domain) { - powercap_unregister_zone(control_type, - &platform_rapl_domain->power_zone); - kfree(platform_rapl_domain); - } - powercap_unregister_control_type(control_type); -} - -static int rapl_package_register_powercap(struct rapl_package *rp) -{ - struct rapl_domain *rd; - char dev_name[17]; /* max domain name = 7 + 1 + 8 for int + 1 for null*/ - struct powercap_zone *power_zone = NULL; - int nr_pl, ret; - - /* Update the domain data of the new package */ - rapl_update_domain_data(rp); - - /* first we register package domain as the parent zone*/ - for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { - if (rd->id == RAPL_DOMAIN_PACKAGE) { - nr_pl = find_nr_power_limit(rd); - pr_debug("register socket %d package domain %s\n", - rp->id, rd->name); - memset(dev_name, 0, sizeof(dev_name)); - snprintf(dev_name, sizeof(dev_name), "%s-%d", - rd->name, rp->id); - power_zone = powercap_register_zone(&rd->power_zone, - control_type, - dev_name, NULL, - &zone_ops[rd->id], - nr_pl, - &constraint_ops); - if (IS_ERR(power_zone)) { - pr_debug("failed to register package, %d\n", - rp->id); - return PTR_ERR(power_zone); - } - /* track parent zone in per package/socket data */ - rp->power_zone = power_zone; - /* done, only one package domain per socket */ - break; - } - } - if (!power_zone) { - pr_err("no package domain found, unknown topology!\n"); - return -ENODEV; - } - /* now register domains as children of the socket/package*/ - for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { - if (rd->id == RAPL_DOMAIN_PACKAGE) - continue; - /* number of power limits per domain varies */ - nr_pl = find_nr_power_limit(rd); - power_zone = powercap_register_zone(&rd->power_zone, - control_type, rd->name, - rp->power_zone, - &zone_ops[rd->id], nr_pl, - &constraint_ops); - - if (IS_ERR(power_zone)) { - pr_debug("failed to register power_zone, %d:%s:%s\n", - rp->id, rd->name, dev_name); - ret = PTR_ERR(power_zone); - goto err_cleanup; - } - } - return 0; - -err_cleanup: - /* - * Clean up previously initialized domains within the package if we - * failed after the first domain setup. - */ - while (--rd >= rp->domains) { - pr_debug("unregister package %d domain %s\n", rp->id, rd->name); - powercap_unregister_zone(control_type, &rd->power_zone); - } - - return ret; -} - -static int __init rapl_register_psys(void) -{ - struct rapl_domain *rd; - struct powercap_zone *power_zone; - u64 val; - - if (rdmsrl_safe_on_cpu(0, MSR_PLATFORM_ENERGY_STATUS, &val) || !val) - return -ENODEV; - - if (rdmsrl_safe_on_cpu(0, MSR_PLATFORM_POWER_LIMIT, &val) || !val) - return -ENODEV; - - rd = kzalloc(sizeof(*rd), GFP_KERNEL); - if (!rd) - return -ENOMEM; - - rd->name = rapl_domain_names[RAPL_DOMAIN_PLATFORM]; - rd->id = RAPL_DOMAIN_PLATFORM; - rd->msrs[0] = MSR_PLATFORM_POWER_LIMIT; - rd->msrs[1] = MSR_PLATFORM_ENERGY_STATUS; - rd->rpl[0].prim_id = PL1_ENABLE; - rd->rpl[0].name = pl1_name; - rd->rpl[1].prim_id = PL2_ENABLE; - rd->rpl[1].name = pl2_name; - rd->rp = find_package_by_id(0); - - power_zone = powercap_register_zone(&rd->power_zone, control_type, - "psys", NULL, - &zone_ops[RAPL_DOMAIN_PLATFORM], - 2, &constraint_ops); - - if (IS_ERR(power_zone)) { - kfree(rd); - return PTR_ERR(power_zone); - } - - platform_rapl_domain = rd; - - return 0; -} - -static int __init rapl_register_powercap(void) -{ - control_type = powercap_register_control_type(NULL, "intel-rapl", NULL); - if (IS_ERR(control_type)) { - pr_debug("failed to register powercap control_type.\n"); - return PTR_ERR(control_type); - } - return 0; -} - -static int rapl_check_domain(int cpu, int domain) -{ - unsigned msr; - u64 val = 0; - - switch (domain) { - case RAPL_DOMAIN_PACKAGE: - msr = MSR_PKG_ENERGY_STATUS; - break; - case RAPL_DOMAIN_PP0: - msr = MSR_PP0_ENERGY_STATUS; - break; - case RAPL_DOMAIN_PP1: - msr = MSR_PP1_ENERGY_STATUS; - break; - case RAPL_DOMAIN_DRAM: - msr = MSR_DRAM_ENERGY_STATUS; - break; - case RAPL_DOMAIN_PLATFORM: - /* PSYS(PLATFORM) is not a CPU domain, so avoid printng error */ - return -EINVAL; - default: - pr_err("invalid domain id %d\n", domain); - return -EINVAL; - } - /* make sure domain counters are available and contains non-zero - * values, otherwise skip it. - */ - if (rdmsrl_safe_on_cpu(cpu, msr, &val) || !val) - return -ENODEV; - - return 0; -} - - -/* - * Check if power limits are available. Two cases when they are not available: - * 1. Locked by BIOS, in this case we still provide read-only access so that - * users can see what limit is set by the BIOS. - * 2. Some CPUs make some domains monitoring only which means PLx MSRs may not - * exist at all. In this case, we do not show the contraints in powercap. - * - * Called after domains are detected and initialized. - */ -static void rapl_detect_powerlimit(struct rapl_domain *rd) -{ - u64 val64; - int i; - - /* check if the domain is locked by BIOS, ignore if MSR doesn't exist */ - if (!rapl_read_data_raw(rd, FW_LOCK, false, &val64)) { - if (val64) { - pr_info("RAPL package %d domain %s locked by BIOS\n", - rd->rp->id, rd->name); - rd->state |= DOMAIN_STATE_BIOS_LOCKED; - } - } - /* check if power limit MSRs exists, otherwise domain is monitoring only */ - for (i = 0; i < NR_POWER_LIMITS; i++) { - int prim = rd->rpl[i].prim_id; - if (rapl_read_data_raw(rd, prim, false, &val64)) - rd->rpl[i].name = NULL; - } -} - -/* Detect active and valid domains for the given CPU, caller must - * ensure the CPU belongs to the targeted package and CPU hotlug is disabled. - */ -static int rapl_detect_domains(struct rapl_package *rp, int cpu) -{ - struct rapl_domain *rd; - int i; - - for (i = 0; i < RAPL_DOMAIN_MAX; i++) { - /* use physical package id to read counters */ - if (!rapl_check_domain(cpu, i)) { - rp->domain_map |= 1 << i; - pr_info("Found RAPL domain %s\n", rapl_domain_names[i]); - } - } - rp->nr_domains = bitmap_weight(&rp->domain_map, RAPL_DOMAIN_MAX); - if (!rp->nr_domains) { - pr_debug("no valid rapl domains found in package %d\n", rp->id); - return -ENODEV; - } - pr_debug("found %d domains on package %d\n", rp->nr_domains, rp->id); - - rp->domains = kcalloc(rp->nr_domains + 1, sizeof(struct rapl_domain), - GFP_KERNEL); - if (!rp->domains) - return -ENOMEM; - - rapl_init_domains(rp); - - for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) - rapl_detect_powerlimit(rd); - - return 0; -} - -/* called from CPU hotplug notifier, hotplug lock held */ -static void rapl_remove_package(struct rapl_package *rp) -{ - struct rapl_domain *rd, *rd_package = NULL; - - package_power_limit_irq_restore(rp); - - for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { - rapl_write_data_raw(rd, PL1_ENABLE, 0); - rapl_write_data_raw(rd, PL1_CLAMP, 0); - if (find_nr_power_limit(rd) > 1) { - rapl_write_data_raw(rd, PL2_ENABLE, 0); - rapl_write_data_raw(rd, PL2_CLAMP, 0); - } - if (rd->id == RAPL_DOMAIN_PACKAGE) { - rd_package = rd; - continue; - } - pr_debug("remove package, undo power limit on %d: %s\n", - rp->id, rd->name); - powercap_unregister_zone(control_type, &rd->power_zone); - } - /* do parent zone last */ - powercap_unregister_zone(control_type, &rd_package->power_zone); - list_del(&rp->plist); - kfree(rp); -} - -/* called from CPU hotplug notifier, hotplug lock held */ -static struct rapl_package *rapl_add_package(int cpu, int pkgid) -{ - struct rapl_package *rp; - int ret; - - rp = kzalloc(sizeof(struct rapl_package), GFP_KERNEL); - if (!rp) - return ERR_PTR(-ENOMEM); - - /* add the new package to the list */ - rp->id = pkgid; - rp->lead_cpu = cpu; - - /* check if the package contains valid domains */ - if (rapl_detect_domains(rp, cpu) || - rapl_defaults->check_unit(rp, cpu)) { - ret = -ENODEV; - goto err_free_package; - } - ret = rapl_package_register_powercap(rp); - if (!ret) { - INIT_LIST_HEAD(&rp->plist); - list_add(&rp->plist, &rapl_packages); - return rp; - } - -err_free_package: - kfree(rp->domains); - kfree(rp); - return ERR_PTR(ret); -} - -/* Handles CPU hotplug on multi-socket systems. - * If a CPU goes online as the first CPU of the physical package - * we add the RAPL package to the system. Similarly, when the last - * CPU of the package is removed, we remove the RAPL package and its - * associated domains. Cooling devices are handled accordingly at - * per-domain level. - */ -static int rapl_cpu_online(unsigned int cpu) -{ - int pkgid = topology_physical_package_id(cpu); - struct rapl_package *rp; - - rp = find_package_by_id(pkgid); - if (!rp) { - rp = rapl_add_package(cpu, pkgid); - if (IS_ERR(rp)) - return PTR_ERR(rp); - } - cpumask_set_cpu(cpu, &rp->cpumask); - return 0; -} - -static int rapl_cpu_down_prep(unsigned int cpu) -{ - int pkgid = topology_physical_package_id(cpu); - struct rapl_package *rp; - int lead_cpu; - - rp = find_package_by_id(pkgid); - if (!rp) - return 0; - - cpumask_clear_cpu(cpu, &rp->cpumask); - lead_cpu = cpumask_first(&rp->cpumask); - if (lead_cpu >= nr_cpu_ids) - rapl_remove_package(rp); - else if (rp->lead_cpu == cpu) - rp->lead_cpu = lead_cpu; - return 0; -} - -static enum cpuhp_state pcap_rapl_online; - -static void power_limit_state_save(void) -{ - struct rapl_package *rp; - struct rapl_domain *rd; - int nr_pl, ret, i; - - get_online_cpus(); - list_for_each_entry(rp, &rapl_packages, plist) { - if (!rp->power_zone) - continue; - rd = power_zone_to_rapl_domain(rp->power_zone); - nr_pl = find_nr_power_limit(rd); - for (i = 0; i < nr_pl; i++) { - switch (rd->rpl[i].prim_id) { - case PL1_ENABLE: - ret = rapl_read_data_raw(rd, - POWER_LIMIT1, - true, - &rd->rpl[i].last_power_limit); - if (ret) - rd->rpl[i].last_power_limit = 0; - break; - case PL2_ENABLE: - ret = rapl_read_data_raw(rd, - POWER_LIMIT2, - true, - &rd->rpl[i].last_power_limit); - if (ret) - rd->rpl[i].last_power_limit = 0; - break; - } - } - } - put_online_cpus(); -} - -static void power_limit_state_restore(void) -{ - struct rapl_package *rp; - struct rapl_domain *rd; - int nr_pl, i; - - get_online_cpus(); - list_for_each_entry(rp, &rapl_packages, plist) { - if (!rp->power_zone) - continue; - rd = power_zone_to_rapl_domain(rp->power_zone); - nr_pl = find_nr_power_limit(rd); - for (i = 0; i < nr_pl; i++) { - switch (rd->rpl[i].prim_id) { - case PL1_ENABLE: - if (rd->rpl[i].last_power_limit) - rapl_write_data_raw(rd, - POWER_LIMIT1, - rd->rpl[i].last_power_limit); - break; - case PL2_ENABLE: - if (rd->rpl[i].last_power_limit) - rapl_write_data_raw(rd, - POWER_LIMIT2, - rd->rpl[i].last_power_limit); - break; - } - } - } - put_online_cpus(); -} - -static int rapl_pm_callback(struct notifier_block *nb, - unsigned long mode, void *_unused) -{ - switch (mode) { - case PM_SUSPEND_PREPARE: - power_limit_state_save(); - break; - case PM_POST_SUSPEND: - power_limit_state_restore(); - break; - } - return NOTIFY_OK; -} - -static struct notifier_block rapl_pm_notifier = { - .notifier_call = rapl_pm_callback, -}; - -static int __init rapl_init(void) -{ - const struct x86_cpu_id *id; - int ret; - - id = x86_match_cpu(rapl_ids); - if (!id) { - pr_err("driver does not support CPU family %d model %d\n", - boot_cpu_data.x86, boot_cpu_data.x86_model); - - return -ENODEV; - } - - rapl_defaults = (struct rapl_defaults *)id->driver_data; - - ret = rapl_register_powercap(); - if (ret) - return ret; - - ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powercap/rapl:online", - rapl_cpu_online, rapl_cpu_down_prep); - if (ret < 0) - goto err_unreg; - pcap_rapl_online = ret; - - /* Don't bail out if PSys is not supported */ - rapl_register_psys(); - - ret = register_pm_notifier(&rapl_pm_notifier); - if (ret) - goto err_unreg_all; - - return 0; - -err_unreg_all: - cpuhp_remove_state(pcap_rapl_online); - -err_unreg: - rapl_unregister_powercap(); - return ret; -} - -static void __exit rapl_exit(void) -{ - unregister_pm_notifier(&rapl_pm_notifier); - cpuhp_remove_state(pcap_rapl_online); - rapl_unregister_powercap(); -} - -module_init(rapl_init); -module_exit(rapl_exit); - -MODULE_DESCRIPTION("Driver for Intel RAPL (Running Average Power Limit)"); -MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com>"); -MODULE_LICENSE("GPL v2"); |