diff options
Diffstat (limited to 'drivers/powercap/intel_rapl_common.c')
| -rw-r--r-- | drivers/powercap/intel_rapl_common.c | 1462 |
1 files changed, 1462 insertions, 0 deletions
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c new file mode 100644 index 000000000000..9fd6dd342169 --- /dev/null +++ b/drivers/powercap/intel_rapl_common.c @@ -0,0 +1,1462 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Common code for Intel Running Average Power Limit (RAPL) support. + * Copyright (c) 2019, Intel Corporation. + */ +#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 <linux/intel_rapl.h> +#include <linux/processor.h> +#include <linux/platform_device.h> + +#include <asm/iosf_mbi.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_HIGH_LOCK BIT_ULL(63) +#define POWER_LOW_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, +}; + +/* per domain data, some are optional */ +#define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2) + +#define DOMAIN_STATE_INACTIVE BIT(0) +#define DOMAIN_STATE_POWER_LIMIT_SET BIT(1) +#define DOMAIN_STATE_BIOS_LOCKED BIT(2) + +static const char pl1_name[] = "long_term"; +static const char pl2_name[] = "short_term"; + +#define power_zone_to_rapl_domain(_zone) \ + container_of(_zone, struct rapl_domain, power_zone) + +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_reg_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 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-existent 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) +{ + enum rapl_domain_type i; + enum rapl_domain_reg_id j; + struct rapl_domain *rd = rp->domains; + + for (i = 0; i < RAPL_DOMAIN_MAX; i++) { + unsigned int mask = rp->domain_map & (1 << i); + + if (!mask) + continue; + + rd->rp = rp; + rd->name = rapl_domain_names[i]; + rd->id = i; + rd->rpl[0].prim_id = PL1_ENABLE; + rd->rpl[0].name = pl1_name; + /* some domain may support two power limits */ + if (rp->priv->limits[i] == 2) { + rd->rpl[1].prim_id = PL2_ENABLE; + rd->rpl[1].name = pl2_name; + } + + for (j = 0; j < RAPL_DOMAIN_REG_MAX; j++) + rd->regs[j] = rp->priv->regs[i][j]; + + if (i == RAPL_DOMAIN_DRAM) { + 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); + } + 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_REG_STATUS, ENERGY_UNIT, 0), + PRIMITIVE_INFO_INIT(POWER_LIMIT1, POWER_LIMIT1_MASK, 0, + RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0), + PRIMITIVE_INFO_INIT(POWER_LIMIT2, POWER_LIMIT2_MASK, 32, + RAPL_DOMAIN_REG_LIMIT, POWER_UNIT, 0), + PRIMITIVE_INFO_INIT(FW_LOCK, POWER_LOW_LOCK, 31, + RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0), + PRIMITIVE_INFO_INIT(PL1_ENABLE, POWER_LIMIT1_ENABLE, 15, + RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0), + PRIMITIVE_INFO_INIT(PL1_CLAMP, POWER_LIMIT1_CLAMP, 16, + RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0), + PRIMITIVE_INFO_INIT(PL2_ENABLE, POWER_LIMIT2_ENABLE, 47, + RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0), + PRIMITIVE_INFO_INIT(PL2_CLAMP, POWER_LIMIT2_CLAMP, 48, + RAPL_DOMAIN_REG_LIMIT, ARBITRARY_UNIT, 0), + PRIMITIVE_INFO_INIT(TIME_WINDOW1, TIME_WINDOW1_MASK, 17, + RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0), + PRIMITIVE_INFO_INIT(TIME_WINDOW2, TIME_WINDOW2_MASK, 49, + RAPL_DOMAIN_REG_LIMIT, TIME_UNIT, 0), + PRIMITIVE_INFO_INIT(THERMAL_SPEC_POWER, POWER_INFO_THERMAL_SPEC_MASK, + 0, RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0), + PRIMITIVE_INFO_INIT(MAX_POWER, POWER_INFO_MAX_MASK, 32, + RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0), + PRIMITIVE_INFO_INIT(MIN_POWER, POWER_INFO_MIN_MASK, 16, + RAPL_DOMAIN_REG_INFO, POWER_UNIT, 0), + PRIMITIVE_INFO_INIT(MAX_TIME_WINDOW, POWER_INFO_MAX_TIME_WIN_MASK, 48, + RAPL_DOMAIN_REG_INFO, TIME_UNIT, 0), + PRIMITIVE_INFO_INIT(THROTTLED_TIME, PERF_STATUS_THROTTLE_TIME_MASK, 0, + RAPL_DOMAIN_REG_PERF, TIME_UNIT, 0), + PRIMITIVE_INFO_INIT(PRIORITY_LEVEL, PP_POLICY_MASK, 0, + RAPL_DOMAIN_REG_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; + struct rapl_primitive_info *rp = &rpi[prim]; + struct reg_action ra; + int cpu; + + if (!rp->name || rp->flag & RAPL_PRIMITIVE_DUMMY) + return -EINVAL; + + ra.reg = rd->regs[rp->id]; + if (!ra.reg) + return -EINVAL; + + cpu = rd->rp->lead_cpu; + + /* domain with 2 limits has different bit */ + if (prim == FW_LOCK && rd->rp->priv->limits[rd->id] == 2) { + rp->mask = POWER_HIGH_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; + } + + ra.mask = rp->mask; + + if (rd->rp->priv->read_raw(cpu, &ra)) { + pr_debug("failed to read reg 0x%llx on cpu %d\n", ra.reg, cpu); + return -EIO; + } + + value = ra.value >> rp->shift; + + if (xlate) + *data = rapl_unit_xlate(rd, rp->unit, value, 0); + else + *data = value; + + return 0; +} + +/* 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 reg_action ra; + int ret; + + cpu = rd->rp->lead_cpu; + bits = rapl_unit_xlate(rd, rp->unit, value, 1); + bits <<= rp->shift; + bits &= rp->mask; + + memset(&ra, 0, sizeof(ra)); + + ra.reg = rd->regs[rp->id]; + ra.mask = rp->mask; + ra.value = bits; + + ret = rd->rp->priv->write_raw(cpu, &ra); + + 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) +{ + struct reg_action ra; + u32 value; + + ra.reg = rp->priv->reg_unit; + ra.mask = ~0; + if (rp->priv->read_raw(cpu, &ra)) { + pr_err("Failed to read power unit REG 0x%llx on CPU %d, exit.\n", + rp->priv->reg_unit, cpu); + return -ENODEV; + } + + value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET; + rp->energy_unit = ENERGY_UNIT_SCALE * 1000000 / (1 << value); + + value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET; + rp->power_unit = 1000000 / (1 << value); + + value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET; + rp->time_unit = 1000000 / (1 << value); + + pr_debug("Core CPU %s energy=%dpJ, time=%dus, power=%duW\n", + rp->name, rp->energy_unit, rp->time_unit, rp->power_unit); + + return 0; +} + +static int rapl_check_unit_atom(struct rapl_package *rp, int cpu) +{ + struct reg_action ra; + u32 value; + + ra.reg = rp->priv->reg_unit; + ra.mask = ~0; + if (rp->priv->read_raw(cpu, &ra)) { + pr_err("Failed to read power unit REG 0x%llx on CPU %d, exit.\n", + rp->priv->reg_unit, cpu); + return -ENODEV; + } + + value = (ra.value & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET; + rp->energy_unit = ENERGY_UNIT_SCALE * 1 << value; + + value = (ra.value & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET; + rp->power_unit = (1 << value) * 1000; + + value = (ra.value & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET; + rp->time_unit = 1000000 / (1 << value); + + pr_debug("Atom %s energy=%dpJ, time=%dus, power=%duW\n", + rp->name, 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; + + 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(ICELAKE_DESKTOP, rapl_defaults_core), + INTEL_CPU_FAM6(ICELAKE_NNPI, rapl_defaults_core), + INTEL_CPU_FAM6(ICELAKE_X, rapl_defaults_hsw_server), + INTEL_CPU_FAM6(ICELAKE_XEON_D, rapl_defaults_hsw_server), + + 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 %s domain %s data\n", rp->name, + 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 int rapl_package_register_powercap(struct rapl_package *rp) +{ + struct rapl_domain *rd; + 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 package domain %s\n", rp->name); + power_zone = powercap_register_zone(&rd->power_zone, + rp->priv->control_type, rp->name, + NULL, &zone_ops[rd->id], nr_pl, + &constraint_ops); + if (IS_ERR(power_zone)) { + pr_debug("failed to register power zone %s\n", + rp->name); + 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, + rp->priv->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, %s:%s\n", + rp->name, rd->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 %s domain %s\n", rp->name, rd->name); + powercap_unregister_zone(rp->priv->control_type, + &rd->power_zone); + } + + return ret; +} + +int rapl_add_platform_domain(struct rapl_if_priv *priv) +{ + struct rapl_domain *rd; + struct powercap_zone *power_zone; + struct reg_action ra; + int ret; + + ra.reg = priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_STATUS]; + ra.mask = ~0; + ret = priv->read_raw(0, &ra); + if (ret || !ra.value) + return -ENODEV; + + ra.reg = priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT]; + ra.mask = ~0; + ret = priv->read_raw(0, &ra); + if (ret || !ra.value) + 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->regs[RAPL_DOMAIN_REG_LIMIT] = + priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_LIMIT]; + rd->regs[RAPL_DOMAIN_REG_STATUS] = + priv->regs[RAPL_DOMAIN_PLATFORM][RAPL_DOMAIN_REG_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 = rapl_find_package_domain(0, priv); + + power_zone = powercap_register_zone(&rd->power_zone, priv->control_type, + "psys", NULL, + &zone_ops[RAPL_DOMAIN_PLATFORM], + 2, &constraint_ops); + + if (IS_ERR(power_zone)) { + kfree(rd); + return PTR_ERR(power_zone); + } + + priv->platform_rapl_domain = rd; + + return 0; +} +EXPORT_SYMBOL_GPL(rapl_add_platform_domain); + +void rapl_remove_platform_domain(struct rapl_if_priv *priv) +{ + if (priv->platform_rapl_domain) { + powercap_unregister_zone(priv->control_type, + &priv->platform_rapl_domain->power_zone); + kfree(priv->platform_rapl_domain); + } +} +EXPORT_SYMBOL_GPL(rapl_remove_platform_domain); + +static int rapl_check_domain(int cpu, int domain, struct rapl_package *rp) +{ + struct reg_action ra; + + switch (domain) { + case RAPL_DOMAIN_PACKAGE: + case RAPL_DOMAIN_PP0: + case RAPL_DOMAIN_PP1: + case RAPL_DOMAIN_DRAM: + ra.reg = rp->priv->regs[domain][RAPL_DOMAIN_REG_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. + */ + + ra.mask = ~0; + if (rp->priv->read_raw(cpu, &ra) || !ra.value) + 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 constraints 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 %s domain %s locked by BIOS\n", + rd->rp->name, rd->name); + rd->state |= DOMAIN_STATE_BIOS_LOCKED; + } + } + /* check if power limit MSR 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)) { + 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 %s\n", rp->name); + return -ENODEV; + } + pr_debug("found %d domains on %s\n", rp->nr_domains, rp->name); + + 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 */ +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 %s: %s\n", + rp->name, rd->name); + powercap_unregister_zone(rp->priv->control_type, + &rd->power_zone); + } + /* do parent zone last */ + powercap_unregister_zone(rp->priv->control_type, + &rd_package->power_zone); + list_del(&rp->plist); + kfree(rp); +} +EXPORT_SYMBOL_GPL(rapl_remove_package); + +/* caller to ensure CPU hotplug lock is held */ +struct rapl_package *rapl_find_package_domain(int cpu, struct rapl_if_priv *priv) +{ + int id = topology_logical_die_id(cpu); + struct rapl_package *rp; + + list_for_each_entry(rp, &rapl_packages, plist) { + if (rp->id == id + && rp->priv->control_type == priv->control_type) + return rp; + } + + return NULL; +} +EXPORT_SYMBOL_GPL(rapl_find_package_domain); + +/* called from CPU hotplug notifier, hotplug lock held */ +struct rapl_package *rapl_add_package(int cpu, struct rapl_if_priv *priv) +{ + int id = topology_logical_die_id(cpu); + struct rapl_package *rp; + struct cpuinfo_x86 *c = &cpu_data(cpu); + 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 = id; + rp->lead_cpu = cpu; + rp->priv = priv; + + if (topology_max_die_per_package() > 1) + snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, + "package-%d-die-%d", c->phys_proc_id, c->cpu_die_id); + else + snprintf(rp->name, PACKAGE_DOMAIN_NAME_LENGTH, "package-%d", + c->phys_proc_id); + + /* 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); +} +EXPORT_SYMBOL_GPL(rapl_add_package); + +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 struct platform_device *rapl_msr_platdev; + +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 = register_pm_notifier(&rapl_pm_notifier); + if (ret) + return ret; + + rapl_msr_platdev = platform_device_alloc("intel_rapl_msr", 0); + if (!rapl_msr_platdev) { + ret = -ENOMEM; + goto end; + } + + ret = platform_device_add(rapl_msr_platdev); + if (ret) + platform_device_put(rapl_msr_platdev); + +end: + if (ret) + unregister_pm_notifier(&rapl_pm_notifier); + + return ret; +} + +static void __exit rapl_exit(void) +{ + platform_device_unregister(rapl_msr_platdev); + unregister_pm_notifier(&rapl_pm_notifier); +} + +module_init(rapl_init); +module_exit(rapl_exit); + +MODULE_DESCRIPTION("Intel Runtime Average Power Limit (RAPL) common code"); +MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com>"); +MODULE_LICENSE("GPL v2"); |