/*
* 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 <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;
};
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 */
int nr_cpus; /* active cpus on the package, topology info is lost during
* cpu hotplug. so we have to track ourselves.
*/
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 */
};
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;
}
/* caller must hold cpu hotplug lock */
static void rapl_cleanup_data(void)
{
struct rapl_package *p, *tmp;
list_for_each_entry_safe(p, tmp, &rapl_packages, plist) {
kfree(p->domains);
list_del(&p->plist);
kfree(p);
}
}
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;
}
}
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);
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);
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;
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);
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;
}
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);
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;
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 && 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 |= bits << rp->shift;
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);
}
static void power_limit_irq_restore_cpu(void *info)
{
u32 l, h = 0;
struct rapl_package *rp = (struct rapl_package *)info;
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);
}
/* restore per package power limit interrupt enable state */
static void package_power_limit_irq_restore(struct rapl_package *rp)
{
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;
smp_call_function_single(rp->lead_cpu, power_limit_irq_restore_cpu, rp, 1);
}
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,
};
#define RAPL_CPU(_model, _ops) { \
.vendor = X86_VENDOR_INTEL, \
.family = 6, \
.model = _model, \
.driver_data = (kernel_ulong_t)&_ops, \
}
static const struct x86_cpu_id rapl_ids[] __initconst = {
RAPL_CPU(INTEL_FAM6_SANDYBRIDGE, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_SANDYBRIDGE_X, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_IVYBRIDGE, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_IVYBRIDGE_X, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_HASWELL_CORE, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_HASWELL_ULT, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_HASWELL_GT3E, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_HASWELL_X, rapl_defaults_hsw_server),
RAPL_CPU(INTEL_FAM6_BROADWELL_CORE, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_BROADWELL_GT3E, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_BROADWELL_XEON_D, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_BROADWELL_X, rapl_defaults_hsw_server),
RAPL_CPU(INTEL_FAM6_SKYLAKE_DESKTOP, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_SKYLAKE_MOBILE, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_SKYLAKE_X, rapl_defaults_hsw_server),
RAPL_CPU(INTEL_FAM6_KABYLAKE_MOBILE, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_KABYLAKE_DESKTOP, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_ATOM_SILVERMONT1, rapl_defaults_byt),
RAPL_CPU(INTEL_FAM6_ATOM_AIRMONT, rapl_defaults_cht),
RAPL_CPU(INTEL_FAM6_ATOM_MERRIFIELD1, rapl_defaults_tng),
RAPL_CPU(INTEL_FAM6_ATOM_MERRIFIELD2, rapl_defaults_ann),
RAPL_CPU(INTEL_FAM6_ATOM_GOLDMONT, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_ATOM_DENVERTON, rapl_defaults_core),
RAPL_CPU(INTEL_FAM6_XEON_PHI_KNL, rapl_defaults_hsw_server),
{}
};
MODULE_DEVICE_TABLE(x86cpu, rapl_ids);
/* read once for all raw primitive data for all packages, domains */
static void rapl_update_domain_data(void)
{
int dmn, prim;
u64 val;
struct rapl_package *rp;
list_for_each_entry(rp, &rapl_packages, plist) {
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 int rapl_unregister_powercap(void)
{
struct rapl_package *rp;
struct rapl_domain *rd, *rd_package = NULL;
/* unregister all active rapl packages from the powercap layer,
* hotplug lock held
*/
list_for_each_entry(rp, &rapl_packages, plist) {
package_power_limit_irq_restore(rp);
for (rd = rp->domains; rd < rp->domains + rp->nr_domains;
rd++) {
pr_debug("remove package, undo power limit on %d: %s\n",
rp->id, rd->name);
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;
}
powercap_unregister_zone(control_type, &rd->power_zone);
}
/* do the package zone last */
if (rd_package)
powercap_unregister_zone(control_type,
&rd_package->power_zone);
}
if (platform_rapl_domain) {
powercap_unregister_zone(control_type,
&platform_rapl_domain->power_zone);
kfree(platform_rapl_domain);
}
powercap_unregister_control_type(control_type);
return 0;
}
static int rapl_package_register_powercap(struct rapl_package *rp)
{
struct rapl_domain *rd;
int ret = 0;
char dev_name[17]; /* max domain name = 7 + 1 + 8 for int + 1 for null*/
struct powercap_zone *power_zone = NULL;
int nr_pl;
/* 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);
ret = PTR_ERR(power_zone);
goto exit_package;
}
/* 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");
ret = -ENODEV;
goto exit_package;
}
/* 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;
}
}
exit_package:
return ret;
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 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 rapl_register_powercap(void)
{
struct rapl_domain *rd;
struct rapl_package *rp;
int ret = 0;
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);
}
/* read the initial data */
rapl_update_domain_data();
list_for_each_entry(rp, &rapl_packages, plist)
if (rapl_package_register_powercap(rp))
goto err_cleanup_package;
/* Don't bail out if PSys is not supported */
rapl_register_psys();
return ret;
err_cleanup_package:
/* clean up previously initialized packages */
list_for_each_entry_continue_reverse(rp, &rapl_packages, plist) {
for (rd = rp->domains; rd < rp->domains + rp->nr_domains;
rd++) {
pr_debug("unregister zone/package %d, %s domain\n",
rp->id, rd->name);
powercap_unregister_zone(control_type, &rd->power_zone);
}
}
return ret;
}
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)
{
int i;
int ret = 0;
struct rapl_domain *rd;
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);
ret = -ENODEV;
goto done;
}
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) {
ret = -ENOMEM;
goto done;
}
rapl_init_domains(rp);
for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++)
rapl_detect_powerlimit(rd);
done:
return ret;
}
static bool is_package_new(int package)
{
struct rapl_package *rp;
/* caller prevents cpu hotplug, there will be no new packages added
* or deleted while traversing the package list, no need for locking.
*/
list_for_each_entry(rp, &rapl_packages, plist)
if (package == rp->id)
return false;
return true;
}
/* RAPL interface can be made of a two-level hierarchy: package level and domain
* level. We first detect the number of packages then domains of each package.
* We have to consider the possiblity of CPU online/offline due to hotplug and
* other scenarios.
*/
static int rapl_detect_topology(void)
{
int i;
int phy_package_id;
struct rapl_package *new_package, *rp;
for_each_online_cpu(i) {
phy_package_id = topology_physical_package_id(i);
if (is_package_new(phy_package_id)) {
new_package = kzalloc(sizeof(*rp), GFP_KERNEL);
if (!new_package) {
rapl_cleanup_data();
return -ENOMEM;
}
/* add the new package to the list */
new_package->id = phy_package_id;
new_package->nr_cpus = 1;
/* use the first active cpu of the package to access */
new_package->lead_cpu = i;
/* check if the package contains valid domains */
if (rapl_detect_domains(new_package, i) ||
rapl_defaults->check_unit(new_package, i)) {
kfree(new_package->domains);
kfree(new_package);
/* free up the packages already initialized */
rapl_cleanup_data();
return -ENODEV;
}
INIT_LIST_HEAD(&new_package->plist);
list_add(&new_package->plist, &rapl_packages);
} else {
rp = find_package_by_id(phy_package_id);
if (rp)
++rp->nr_cpus;
}
}
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;
for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
if (rd->id == RAPL_DOMAIN_PACKAGE) {
rd_package = rd;
continue;
}
pr_debug("remove package %d, %s domain\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 int rapl_add_package(int cpu)
{
int ret = 0;
int phy_package_id;
struct rapl_package *rp;
phy_package_id = topology_physical_package_id(cpu);
rp = kzalloc(sizeof(struct rapl_package), GFP_KERNEL);
if (!rp)
return -ENOMEM;
/* add the new package to the list */
rp->id = phy_package_id;
rp->nr_cpus = 1;
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;
}
if (!rapl_package_register_powercap(rp)) {
INIT_LIST_HEAD(&rp->plist);
list_add(&rp->plist, &rapl_packages);
return ret;
}
err_free_package:
kfree(rp->domains);
kfree(rp);
return 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_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned long cpu = (unsigned long)hcpu;
int phy_package_id;
struct rapl_package *rp;
int lead_cpu;
phy_package_id = topology_physical_package_id(cpu);
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
rp = find_package_by_id(phy_package_id);
if (rp)
++rp->nr_cpus;
else
rapl_add_package(cpu);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
rp = find_package_by_id(phy_package_id);
if (!rp)
break;
if (--rp->nr_cpus == 0)
rapl_remove_package(rp);
else if (cpu == rp->lead_cpu) {
/* choose another active cpu in the package */
lead_cpu = cpumask_any_but(topology_core_cpumask(cpu), cpu);
if (lead_cpu < nr_cpu_ids)
rp->lead_cpu = lead_cpu;
else /* should never go here */
pr_err("no active cpu available for package %d\n",
phy_package_id);
}
}
return NOTIFY_OK;
}
static struct notifier_block rapl_cpu_notifier = {
.notifier_call = rapl_cpu_callback,
};
static int __init rapl_init(void)
{
int ret = 0;
const struct x86_cpu_id *id;
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;
cpu_notifier_register_begin();
/* prevent CPU hotplug during detection */
get_online_cpus();
ret = rapl_detect_topology();
if (ret)
goto done;
if (rapl_register_powercap()) {
rapl_cleanup_data();
ret = -ENODEV;
goto done;
}
__register_hotcpu_notifier(&rapl_cpu_notifier);
done:
put_online_cpus();
cpu_notifier_register_done();
return ret;
}
static void __exit rapl_exit(void)
{
cpu_notifier_register_begin();
get_online_cpus();
__unregister_hotcpu_notifier(&rapl_cpu_notifier);
rapl_unregister_powercap();
rapl_cleanup_data();
put_online_cpus();
cpu_notifier_register_done();
}
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");
