mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Jacob Pan](/assets/img/avatar_default.png)
Add support for Broadwell model 0x3d and Haswell model (0x3c). Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1406 lines
36 KiB
C
1406 lines
36 KiB
C
/*
|
|
* 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/processor.h>
|
|
#include <asm/cpu_device_id.h>
|
|
|
|
/* 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)
|
|
|
|
/* scale RAPL units to avoid floating point math inside kernel */
|
|
#define POWER_UNIT_SCALE (1000000)
|
|
#define ENERGY_UNIT_SCALE (1000000)
|
|
#define TIME_UNIT_SCALE (1000000)
|
|
|
|
#define TIME_WINDOW_MAX_MSEC 40000
|
|
#define TIME_WINDOW_MIN_MSEC 250
|
|
|
|
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_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;
|
|
};
|
|
|
|
|
|
#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_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;
|
|
int package_id;
|
|
};
|
|
#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_divisor;
|
|
unsigned int energy_unit_divisor;
|
|
unsigned int time_unit_divisor;
|
|
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;
|
|
};
|
|
#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(int package, enum unit_type type, u64 value,
|
|
int to_raw);
|
|
static void package_power_limit_irq_save(int package_id);
|
|
|
|
static LIST_HEAD(rapl_packages); /* guarded by CPU hotplug lock */
|
|
|
|
static const char * const rapl_domain_names[] = {
|
|
"package",
|
|
"core",
|
|
"uncore",
|
|
"dram",
|
|
};
|
|
|
|
static struct powercap_control_type *control_type; /* PowerCap Controller */
|
|
|
|
/* 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 to ensure CPU hotplug lock is held */
|
|
static int find_active_cpu_on_package(int package_id)
|
|
{
|
|
int i;
|
|
|
|
for_each_online_cpu(i) {
|
|
if (topology_physical_package_id(i) == package_id)
|
|
return i;
|
|
}
|
|
/* all CPUs on this package are offline */
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
*energy = rapl_unit_xlate(0, 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;
|
|
|
|
/* 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) {
|
|
rp = find_package_by_id(rd->package_id);
|
|
if (!rp) {
|
|
dev_warn(&power_zone->dev, "no package id %s\n",
|
|
rd->name);
|
|
return -ENODEV;
|
|
}
|
|
kfree(rd);
|
|
rp->domains = NULL;
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int find_nr_power_limit(struct rapl_domain *rd)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NR_POWER_LIMITS; i++) {
|
|
if (rd->rpl[i].name == NULL)
|
|
break;
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
static int set_domain_enable(struct powercap_zone *power_zone, bool mode)
|
|
{
|
|
struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
|
|
int nr_powerlimit;
|
|
|
|
if (rd->state & DOMAIN_STATE_BIOS_LOCKED)
|
|
return -EACCES;
|
|
get_online_cpus();
|
|
nr_powerlimit = find_nr_power_limit(rd);
|
|
/* here we activate/deactivate the hardware for power limiting */
|
|
rapl_write_data_raw(rd, PL1_ENABLE, mode);
|
|
/* 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);
|
|
}
|
|
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 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,
|
|
},
|
|
};
|
|
|
|
static int set_power_limit(struct powercap_zone *power_zone, int id,
|
|
u64 power_limit)
|
|
{
|
|
struct rapl_domain *rd;
|
|
struct rapl_package *rp;
|
|
int ret = 0;
|
|
|
|
get_online_cpus();
|
|
rd = power_zone_to_rapl_domain(power_zone);
|
|
rp = find_package_by_id(rd->package_id);
|
|
if (!rp) {
|
|
ret = -ENODEV;
|
|
goto set_exit;
|
|
}
|
|
|
|
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(rd->package_id);
|
|
set_exit:
|
|
put_online_cpus();
|
|
return ret;
|
|
}
|
|
|
|
static int get_current_power_limit(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 = 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 id,
|
|
u64 window)
|
|
{
|
|
struct rapl_domain *rd;
|
|
int ret = 0;
|
|
|
|
get_online_cpus();
|
|
rd = power_zone_to_rapl_domain(power_zone);
|
|
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 id, u64 *data)
|
|
{
|
|
struct rapl_domain *rd;
|
|
u64 val;
|
|
int ret = 0;
|
|
|
|
get_online_cpus();
|
|
rd = power_zone_to_rapl_domain(power_zone);
|
|
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 id)
|
|
{
|
|
struct rapl_power_limit *rpl;
|
|
struct rapl_domain *rd;
|
|
|
|
rd = power_zone_to_rapl_domain(power_zone);
|
|
rpl = (struct rapl_power_limit *) &rd->rpl[id];
|
|
|
|
return rpl->name;
|
|
}
|
|
|
|
|
|
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 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;
|
|
break;
|
|
}
|
|
if (mask) {
|
|
rd->package_id = rp->id;
|
|
rd++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static u64 rapl_unit_xlate(int package, enum unit_type type, u64 value,
|
|
int to_raw)
|
|
{
|
|
u64 divisor = 1;
|
|
int scale = 1; /* scale to user friendly data without floating point */
|
|
u64 f, y; /* fraction and exp. used for time unit */
|
|
struct rapl_package *rp;
|
|
|
|
rp = find_package_by_id(package);
|
|
if (!rp)
|
|
return value;
|
|
|
|
switch (type) {
|
|
case POWER_UNIT:
|
|
divisor = rp->power_unit_divisor;
|
|
scale = POWER_UNIT_SCALE;
|
|
break;
|
|
case ENERGY_UNIT:
|
|
scale = ENERGY_UNIT_SCALE;
|
|
divisor = rp->energy_unit_divisor;
|
|
break;
|
|
case TIME_UNIT:
|
|
divisor = rp->time_unit_divisor;
|
|
scale = TIME_UNIT_SCALE;
|
|
/* special processing based on 2^Y*(1+F)/4 = val/divisor, refer
|
|
* to Intel Software Developer's manual Vol. 3a, CH 14.7.4.
|
|
*/
|
|
if (!to_raw) {
|
|
f = (value & 0x60) >> 5;
|
|
y = value & 0x1f;
|
|
value = (1 << y) * (4 + f) * scale / 4;
|
|
return div64_u64(value, divisor);
|
|
} else {
|
|
do_div(value, scale);
|
|
value *= divisor;
|
|
y = ilog2(value);
|
|
f = div64_u64(4 * (value - (1 << y)), 1 << y);
|
|
value = (y & 0x1f) | ((f & 0x3) << 5);
|
|
return value;
|
|
}
|
|
break;
|
|
case ARBITRARY_UNIT:
|
|
default:
|
|
return value;
|
|
};
|
|
|
|
if (to_raw)
|
|
return div64_u64(value * divisor, scale);
|
|
else
|
|
return div64_u64(value * scale, divisor);
|
|
}
|
|
|
|
/* 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;
|
|
/* use physical package id to look up active cpus */
|
|
cpu = find_active_cpu_on_package(rd->package_id);
|
|
if (cpu < 0)
|
|
return 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->package_id, rp->unit, final, 0);
|
|
else
|
|
*data = final;
|
|
|
|
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)
|
|
{
|
|
u64 msr_val;
|
|
u32 msr;
|
|
struct rapl_primitive_info *rp = &rpi[prim];
|
|
int cpu;
|
|
|
|
cpu = find_active_cpu_on_package(rd->package_id);
|
|
if (cpu < 0)
|
|
return cpu;
|
|
msr = rd->msrs[rp->id];
|
|
if (rdmsrl_safe_on_cpu(cpu, msr, &msr_val)) {
|
|
dev_dbg(&rd->power_zone.dev,
|
|
"failed to read msr 0x%x on cpu %d\n", msr, cpu);
|
|
return -EIO;
|
|
}
|
|
value = rapl_unit_xlate(rd->package_id, rp->unit, value, 1);
|
|
msr_val &= ~rp->mask;
|
|
msr_val |= value << rp->shift;
|
|
if (wrmsrl_safe_on_cpu(cpu, msr, msr_val)) {
|
|
dev_dbg(&rd->power_zone.dev,
|
|
"failed to write msr 0x%x on cpu %d\n", msr, cpu);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct x86_cpu_id energy_unit_quirk_ids[] = {
|
|
{ X86_VENDOR_INTEL, 6, 0x37},/* Valleyview */
|
|
{}
|
|
};
|
|
|
|
static int rapl_check_unit(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;
|
|
}
|
|
|
|
/* Raw RAPL data stored in MSRs are in certain scales. We need to
|
|
* convert them into standard units based on the divisors reported in
|
|
* the RAPL unit MSRs.
|
|
* i.e.
|
|
* energy unit: 1/enery_unit_divisor Joules
|
|
* power unit: 1/power_unit_divisor Watts
|
|
* time unit: 1/time_unit_divisor Seconds
|
|
*/
|
|
value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET;
|
|
/* some CPUs have different way to calculate energy unit */
|
|
if (x86_match_cpu(energy_unit_quirk_ids))
|
|
rp->energy_unit_divisor = 1000000 / (1 << value);
|
|
else
|
|
rp->energy_unit_divisor = 1 << value;
|
|
|
|
value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET;
|
|
rp->power_unit_divisor = 1 << value;
|
|
|
|
value = (msr_val & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET;
|
|
rp->time_unit_divisor = 1 << value;
|
|
|
|
pr_debug("Physical package %d units: energy=%d, time=%d, power=%d\n",
|
|
rp->id,
|
|
rp->energy_unit_divisor,
|
|
rp->time_unit_divisor,
|
|
rp->power_unit_divisor);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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(int package_id)
|
|
{
|
|
u32 l, h = 0;
|
|
int cpu;
|
|
struct rapl_package *rp;
|
|
|
|
rp = find_package_by_id(package_id);
|
|
if (!rp)
|
|
return;
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
|
|
return;
|
|
|
|
cpu = find_active_cpu_on_package(package_id);
|
|
if (cpu < 0)
|
|
return;
|
|
/* save the state of PLN irq mask bit before disabling it */
|
|
rdmsr_safe_on_cpu(cpu, 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_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
|
|
}
|
|
|
|
/* restore per package power limit interrupt enable state */
|
|
static void package_power_limit_irq_restore(int package_id)
|
|
{
|
|
u32 l, h;
|
|
int cpu;
|
|
struct rapl_package *rp;
|
|
|
|
rp = find_package_by_id(package_id);
|
|
if (!rp)
|
|
return;
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN))
|
|
return;
|
|
|
|
cpu = find_active_cpu_on_package(package_id);
|
|
if (cpu < 0)
|
|
return;
|
|
|
|
/* irq enable state not saved, nothing to restore */
|
|
if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED))
|
|
return;
|
|
rdmsr_safe_on_cpu(cpu, 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_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
|
|
}
|
|
|
|
static const struct x86_cpu_id rapl_ids[] = {
|
|
{ X86_VENDOR_INTEL, 6, 0x2a},/* Sandy Bridge */
|
|
{ X86_VENDOR_INTEL, 6, 0x2d},/* Sandy Bridge EP */
|
|
{ X86_VENDOR_INTEL, 6, 0x37},/* Valleyview */
|
|
{ X86_VENDOR_INTEL, 6, 0x3a},/* Ivy Bridge */
|
|
{ X86_VENDOR_INTEL, 6, 0x3c},/* Haswell */
|
|
{ X86_VENDOR_INTEL, 6, 0x3d},/* Broadwell */
|
|
{ X86_VENDOR_INTEL, 6, 0x45},/* Haswell ULT */
|
|
/* TODO: Add more CPU IDs after testing */
|
|
{}
|
|
};
|
|
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->id);
|
|
|
|
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, PL2_ENABLE, 0);
|
|
rapl_write_data_raw(rd, PL1_CLAMP, 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);
|
|
}
|
|
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_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;
|
|
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;
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
u64 locked;
|
|
|
|
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;
|
|
else
|
|
pr_warn("RAPL domain %s detection failed\n",
|
|
rapl_domain_names[i]);
|
|
}
|
|
rp->nr_domains = bitmap_weight(&rp->domain_map, RAPL_DOMAIN_MAX);
|
|
if (!rp->nr_domains) {
|
|
pr_err("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++) {
|
|
/* check if the domain is locked by BIOS */
|
|
if (rapl_read_data_raw(rd, FW_LOCK, false, &locked)) {
|
|
pr_info("RAPL package %d domain %s locked by BIOS\n",
|
|
rp->id, rd->name);
|
|
rd->state |= DOMAIN_STATE_BIOS_LOCKED;
|
|
}
|
|
}
|
|
|
|
|
|
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;
|
|
|
|
/* check if the package contains valid domains */
|
|
if (rapl_detect_domains(new_package, i) ||
|
|
rapl_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;
|
|
/* check if the package contains valid domains */
|
|
if (rapl_detect_domains(rp, cpu) ||
|
|
rapl_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;
|
|
|
|
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);
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block rapl_cpu_notifier = {
|
|
.notifier_call = rapl_cpu_callback,
|
|
};
|
|
|
|
static int __init rapl_init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!x86_match_cpu(rapl_ids)) {
|
|
pr_err("driver does not support CPU family %d model %d\n",
|
|
boot_cpu_data.x86, boot_cpu_data.x86_model);
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
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");
|