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@@ -0,0 +1,1395 @@
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+/*
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+ * Intel Running Average Power Limit (RAPL) Driver
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+ * Copyright (c) 2013, Intel Corporation.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms and conditions of the GNU General Public License,
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+ * version 2, as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope it will be useful, but WITHOUT
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+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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+ * more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along with
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+ * this program; if not, write to the Free Software Foundation, Inc.
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+ *
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+ */
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/list.h>
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+#include <linux/types.h>
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+#include <linux/device.h>
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+#include <linux/slab.h>
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+#include <linux/log2.h>
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+#include <linux/bitmap.h>
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+#include <linux/delay.h>
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+#include <linux/sysfs.h>
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+#include <linux/cpu.h>
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+#include <linux/powercap.h>
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+
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+#include <asm/processor.h>
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+#include <asm/cpu_device_id.h>
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+
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+/* bitmasks for RAPL MSRs, used by primitive access functions */
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+#define ENERGY_STATUS_MASK 0xffffffff
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+
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+#define POWER_LIMIT1_MASK 0x7FFF
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+#define POWER_LIMIT1_ENABLE BIT(15)
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+#define POWER_LIMIT1_CLAMP BIT(16)
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+
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+#define POWER_LIMIT2_MASK (0x7FFFULL<<32)
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+#define POWER_LIMIT2_ENABLE BIT_ULL(47)
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+#define POWER_LIMIT2_CLAMP BIT_ULL(48)
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+#define POWER_PACKAGE_LOCK BIT_ULL(63)
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+#define POWER_PP_LOCK BIT(31)
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+
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+#define TIME_WINDOW1_MASK (0x7FULL<<17)
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+#define TIME_WINDOW2_MASK (0x7FULL<<49)
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+
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+#define POWER_UNIT_OFFSET 0
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+#define POWER_UNIT_MASK 0x0F
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+
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+#define ENERGY_UNIT_OFFSET 0x08
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+#define ENERGY_UNIT_MASK 0x1F00
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+
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+#define TIME_UNIT_OFFSET 0x10
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+#define TIME_UNIT_MASK 0xF0000
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+
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+#define POWER_INFO_MAX_MASK (0x7fffULL<<32)
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+#define POWER_INFO_MIN_MASK (0x7fffULL<<16)
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+#define POWER_INFO_MAX_TIME_WIN_MASK (0x3fULL<<48)
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+#define POWER_INFO_THERMAL_SPEC_MASK 0x7fff
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+
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+#define PERF_STATUS_THROTTLE_TIME_MASK 0xffffffff
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+#define PP_POLICY_MASK 0x1F
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+
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+/* Non HW constants */
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+#define RAPL_PRIMITIVE_DERIVED BIT(1) /* not from raw data */
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+#define RAPL_PRIMITIVE_DUMMY BIT(2)
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+
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+/* scale RAPL units to avoid floating point math inside kernel */
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+#define POWER_UNIT_SCALE (1000000)
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+#define ENERGY_UNIT_SCALE (1000000)
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+#define TIME_UNIT_SCALE (1000000)
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+
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+#define TIME_WINDOW_MAX_MSEC 40000
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+#define TIME_WINDOW_MIN_MSEC 250
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+
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+enum unit_type {
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+ ARBITRARY_UNIT, /* no translation */
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+ POWER_UNIT,
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+ ENERGY_UNIT,
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+ TIME_UNIT,
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+};
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+
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+enum rapl_domain_type {
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+ RAPL_DOMAIN_PACKAGE, /* entire package/socket */
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+ RAPL_DOMAIN_PP0, /* core power plane */
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+ RAPL_DOMAIN_PP1, /* graphics uncore */
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+ RAPL_DOMAIN_DRAM,/* DRAM control_type */
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+ RAPL_DOMAIN_MAX,
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+};
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+
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+enum rapl_domain_msr_id {
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+ RAPL_DOMAIN_MSR_LIMIT,
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+ RAPL_DOMAIN_MSR_STATUS,
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+ RAPL_DOMAIN_MSR_PERF,
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+ RAPL_DOMAIN_MSR_POLICY,
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+ RAPL_DOMAIN_MSR_INFO,
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+ RAPL_DOMAIN_MSR_MAX,
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+};
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+
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+/* per domain data, some are optional */
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+enum rapl_primitives {
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+ ENERGY_COUNTER,
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+ POWER_LIMIT1,
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+ POWER_LIMIT2,
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+ FW_LOCK,
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+
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+ PL1_ENABLE, /* power limit 1, aka long term */
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+ PL1_CLAMP, /* allow frequency to go below OS request */
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+ PL2_ENABLE, /* power limit 2, aka short term, instantaneous */
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+ PL2_CLAMP,
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+
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+ TIME_WINDOW1, /* long term */
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+ TIME_WINDOW2, /* short term */
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+ THERMAL_SPEC_POWER,
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+ MAX_POWER,
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+
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+ MIN_POWER,
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+ MAX_TIME_WINDOW,
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+ THROTTLED_TIME,
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+ PRIORITY_LEVEL,
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+
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+ /* below are not raw primitive data */
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+ AVERAGE_POWER,
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+ NR_RAPL_PRIMITIVES,
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+};
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+
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+#define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2)
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+
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+/* Can be expanded to include events, etc.*/
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+struct rapl_domain_data {
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+ u64 primitives[NR_RAPL_PRIMITIVES];
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+ unsigned long timestamp;
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+};
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+
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+
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+#define DOMAIN_STATE_INACTIVE BIT(0)
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+#define DOMAIN_STATE_POWER_LIMIT_SET BIT(1)
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+#define DOMAIN_STATE_BIOS_LOCKED BIT(2)
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+
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+#define NR_POWER_LIMITS (2)
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+struct rapl_power_limit {
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+ struct powercap_zone_constraint *constraint;
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+ int prim_id; /* primitive ID used to enable */
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+ struct rapl_domain *domain;
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+ const char *name;
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+};
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+
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+static const char pl1_name[] = "long_term";
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+static const char pl2_name[] = "short_term";
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+
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+struct rapl_domain {
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+ const char *name;
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+ enum rapl_domain_type id;
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+ int msrs[RAPL_DOMAIN_MSR_MAX];
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+ struct powercap_zone power_zone;
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+ struct rapl_domain_data rdd;
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+ struct rapl_power_limit rpl[NR_POWER_LIMITS];
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+ u64 attr_map; /* track capabilities */
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+ unsigned int state;
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+ int package_id;
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+};
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+#define power_zone_to_rapl_domain(_zone) \
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+ container_of(_zone, struct rapl_domain, power_zone)
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+
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+
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+/* Each physical package contains multiple domains, these are the common
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+ * data across RAPL domains within a package.
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+ */
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+struct rapl_package {
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+ unsigned int id; /* physical package/socket id */
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+ unsigned int nr_domains;
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+ unsigned long domain_map; /* bit map of active domains */
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+ unsigned int power_unit_divisor;
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+ unsigned int energy_unit_divisor;
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+ unsigned int time_unit_divisor;
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+ struct rapl_domain *domains; /* array of domains, sized at runtime */
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+ struct powercap_zone *power_zone; /* keep track of parent zone */
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+ int nr_cpus; /* active cpus on the package, topology info is lost during
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+ * cpu hotplug. so we have to track ourselves.
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+ */
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+ unsigned long power_limit_irq; /* keep track of package power limit
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+ * notify interrupt enable status.
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+ */
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+ struct list_head plist;
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+};
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+#define PACKAGE_PLN_INT_SAVED BIT(0)
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+#define MAX_PRIM_NAME (32)
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+
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+/* per domain data. used to describe individual knobs such that access function
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+ * can be consolidated into one instead of many inline functions.
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+ */
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+struct rapl_primitive_info {
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+ const char *name;
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+ u64 mask;
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+ int shift;
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+ enum rapl_domain_msr_id id;
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+ enum unit_type unit;
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+ u32 flag;
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+};
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+
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+#define PRIMITIVE_INFO_INIT(p, m, s, i, u, f) { \
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+ .name = #p, \
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+ .mask = m, \
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+ .shift = s, \
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+ .id = i, \
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+ .unit = u, \
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+ .flag = f \
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+ }
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+
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+static void rapl_init_domains(struct rapl_package *rp);
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+static int rapl_read_data_raw(struct rapl_domain *rd,
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+ enum rapl_primitives prim,
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+ bool xlate, u64 *data);
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+static int rapl_write_data_raw(struct rapl_domain *rd,
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+ enum rapl_primitives prim,
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+ unsigned long long value);
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+static u64 rapl_unit_xlate(int package, enum unit_type type, u64 value,
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+ int to_raw);
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+static void package_power_limit_irq_save(int package_id);
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+
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+static LIST_HEAD(rapl_packages); /* guarded by CPU hotplug lock */
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+
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+static const char * const rapl_domain_names[] = {
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+ "package",
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+ "core",
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+ "uncore",
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+ "dram",
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+};
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+
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+static struct powercap_control_type *control_type; /* PowerCap Controller */
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+
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+/* caller to ensure CPU hotplug lock is held */
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+static struct rapl_package *find_package_by_id(int id)
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+{
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+ struct rapl_package *rp;
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+
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+ list_for_each_entry(rp, &rapl_packages, plist) {
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+ if (rp->id == id)
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+ return rp;
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+ }
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+
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+ return NULL;
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+}
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+
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+/* caller to ensure CPU hotplug lock is held */
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+static int find_active_cpu_on_package(int package_id)
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+{
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+ int i;
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+
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+ for_each_online_cpu(i) {
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+ if (topology_physical_package_id(i) == package_id)
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+ return i;
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+ }
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+ /* all CPUs on this package are offline */
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+
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+ return -ENODEV;
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+}
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+
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+/* caller must hold cpu hotplug lock */
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+static void rapl_cleanup_data(void)
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+{
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+ struct rapl_package *p, *tmp;
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+
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+ list_for_each_entry_safe(p, tmp, &rapl_packages, plist) {
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+ kfree(p->domains);
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+ list_del(&p->plist);
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+ kfree(p);
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+ }
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+}
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+
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+static int get_energy_counter(struct powercap_zone *power_zone, u64 *energy_raw)
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+{
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+ struct rapl_domain *rd;
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+ u64 energy_now;
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+
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+ /* prevent CPU hotplug, make sure the RAPL domain does not go
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+ * away while reading the counter.
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+ */
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+ get_online_cpus();
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+ rd = power_zone_to_rapl_domain(power_zone);
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+
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+ if (!rapl_read_data_raw(rd, ENERGY_COUNTER, true, &energy_now)) {
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+ *energy_raw = energy_now;
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+ put_online_cpus();
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+
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+ return 0;
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+ }
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+ put_online_cpus();
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+
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+ return -EIO;
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+}
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+
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+static int get_max_energy_counter(struct powercap_zone *pcd_dev, u64 *energy)
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+{
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+ *energy = rapl_unit_xlate(0, ENERGY_UNIT, ENERGY_STATUS_MASK, 0);
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+ return 0;
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+}
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+
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+static int release_zone(struct powercap_zone *power_zone)
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+{
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+ struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
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+ struct rapl_package *rp;
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+
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+ /* package zone is the last zone of a package, we can free
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+ * memory here since all children has been unregistered.
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+ */
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+ if (rd->id == RAPL_DOMAIN_PACKAGE) {
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+ rp = find_package_by_id(rd->package_id);
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+ if (!rp) {
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+ dev_warn(&power_zone->dev, "no package id %s\n",
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+ rd->name);
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+ return -ENODEV;
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+ }
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+ kfree(rd);
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+ rp->domains = NULL;
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+ }
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+
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+ return 0;
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+
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+}
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+
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+static int find_nr_power_limit(struct rapl_domain *rd)
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+{
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+ int i;
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+
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+ for (i = 0; i < NR_POWER_LIMITS; i++) {
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+ if (rd->rpl[i].name == NULL)
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+ break;
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+ }
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+
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+ return i;
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+}
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+
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+static int set_domain_enable(struct powercap_zone *power_zone, bool mode)
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+{
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+ struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
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+ int nr_powerlimit;
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+
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+ if (rd->state & DOMAIN_STATE_BIOS_LOCKED)
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+ return -EACCES;
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+ get_online_cpus();
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+ nr_powerlimit = find_nr_power_limit(rd);
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+ /* here we activate/deactivate the hardware for power limiting */
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+ rapl_write_data_raw(rd, PL1_ENABLE, mode);
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+ /* always enable clamp such that p-state can go below OS requested
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+ * range. power capping priority over guranteed frequency.
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+ */
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+ rapl_write_data_raw(rd, PL1_CLAMP, mode);
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+ /* some domains have pl2 */
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+ if (nr_powerlimit > 1) {
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+ rapl_write_data_raw(rd, PL2_ENABLE, mode);
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+ rapl_write_data_raw(rd, PL2_CLAMP, mode);
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+ }
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+ put_online_cpus();
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+
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+ return 0;
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+}
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+
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+static int get_domain_enable(struct powercap_zone *power_zone, bool *mode)
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+{
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+ struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone);
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+ u64 val;
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+
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+ if (rd->state & DOMAIN_STATE_BIOS_LOCKED) {
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+ *mode = false;
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+ return 0;
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+ }
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+ get_online_cpus();
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+ if (rapl_read_data_raw(rd, PL1_ENABLE, true, &val)) {
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+ put_online_cpus();
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+ return -EIO;
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+ }
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+ *mode = val;
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+ put_online_cpus();
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+
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+ return 0;
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+}
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+
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+/* per RAPL domain ops, in the order of rapl_domain_type */
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+static struct powercap_zone_ops zone_ops[] = {
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+ /* RAPL_DOMAIN_PACKAGE */
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+ {
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+ .get_energy_uj = get_energy_counter,
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+ .get_max_energy_range_uj = get_max_energy_counter,
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+ .release = release_zone,
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+ .set_enable = set_domain_enable,
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+ .get_enable = get_domain_enable,
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+ },
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+ /* RAPL_DOMAIN_PP0 */
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+ {
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+ .get_energy_uj = get_energy_counter,
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+ .get_max_energy_range_uj = get_max_energy_counter,
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+ .release = release_zone,
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+ .set_enable = set_domain_enable,
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+ .get_enable = get_domain_enable,
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+ },
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+ /* RAPL_DOMAIN_PP1 */
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+ {
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+ .get_energy_uj = get_energy_counter,
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+ .get_max_energy_range_uj = get_max_energy_counter,
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+ .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 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;
|
|
|
+ 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},/* SNB */
|
|
|
+ { X86_VENDOR_INTEL, 6, 0x2d},/* SNB EP */
|
|
|
+ { X86_VENDOR_INTEL, 6, 0x3a},/* IVB */
|
|
|
+ { X86_VENDOR_INTEL, 6, 0x45},/* HSW */
|
|
|
+ /* 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 val1, val2 = 0;
|
|
|
+ int retry = 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;
|
|
|
+ }
|
|
|
+ if (rdmsrl_safe_on_cpu(cpu, msr, &val1))
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ /* energy counters roll slowly on some domains */
|
|
|
+ while (++retry < 10) {
|
|
|
+ usleep_range(10000, 15000);
|
|
|
+ rdmsrl_safe_on_cpu(cpu, msr, &val2);
|
|
|
+ if ((val1 & ENERGY_STATUS_MASK) != (val2 & ENERGY_STATUS_MASK))
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ /* if energy counter does not change, report as bad domain */
|
|
|
+ pr_info("domain %s energy ctr %llu:%llu not working, skip\n",
|
|
|
+ rapl_domain_names[domain], val1, val2);
|
|
|
+
|
|
|
+ return -ENODEV;
|
|
|
+}
|
|
|
+
|
|
|
+/* 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;
|
|
|
+ }
|
|
|
+ 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;
|
|
|
+ }
|
|
|
+ /* 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();
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit rapl_exit(void)
|
|
|
+{
|
|
|
+ get_online_cpus();
|
|
|
+ unregister_hotcpu_notifier(&rapl_cpu_notifier);
|
|
|
+ rapl_unregister_powercap();
|
|
|
+ rapl_cleanup_data();
|
|
|
+ put_online_cpus();
|
|
|
+}
|
|
|
+
|
|
|
+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");
|
Rafael J. Wysocki