diff options
| -rw-r--r-- | arch/x86/include/asm/msr-index.h | 18 | ||||
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 34 | ||||
| -rw-r--r-- | tools/power/x86/x86_energy_perf_policy/Makefile | 27 | ||||
| -rw-r--r-- | tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8 | 241 | ||||
| -rw-r--r-- | tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c | 1504 |
5 files changed, 1527 insertions, 297 deletions
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 673f9ac..d8638e2 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -249,9 +249,13 @@ #define HWP_MIN_PERF(x) (x & 0xff) #define HWP_MAX_PERF(x) ((x & 0xff) << 8) #define HWP_DESIRED_PERF(x) ((x & 0xff) << 16) -#define HWP_ENERGY_PERF_PREFERENCE(x) ((x & 0xff) << 24) -#define HWP_ACTIVITY_WINDOW(x) ((x & 0xff3) << 32) -#define HWP_PACKAGE_CONTROL(x) ((x & 0x1) << 42) +#define HWP_ENERGY_PERF_PREFERENCE(x) (((unsigned long long) x & 0xff) << 24) +#define HWP_EPP_PERFORMANCE 0x00 +#define HWP_EPP_BALANCE_PERFORMANCE 0x80 +#define HWP_EPP_BALANCE_POWERSAVE 0xC0 +#define HWP_EPP_POWERSAVE 0xFF +#define HWP_ACTIVITY_WINDOW(x) ((unsigned long long)(x & 0xff3) << 32) +#define HWP_PACKAGE_CONTROL(x) ((unsigned long long)(x & 0x1) << 42) /* IA32_HWP_STATUS */ #define HWP_GUARANTEED_CHANGE(x) (x & 0x1) @@ -474,9 +478,11 @@ #define MSR_MISC_PWR_MGMT 0x000001aa #define MSR_IA32_ENERGY_PERF_BIAS 0x000001b0 -#define ENERGY_PERF_BIAS_PERFORMANCE 0 -#define ENERGY_PERF_BIAS_NORMAL 6 -#define ENERGY_PERF_BIAS_POWERSAVE 15 +#define ENERGY_PERF_BIAS_PERFORMANCE 0 +#define ENERGY_PERF_BIAS_BALANCE_PERFORMANCE 4 +#define ENERGY_PERF_BIAS_NORMAL 6 +#define ENERGY_PERF_BIAS_BALANCE_POWERSAVE 8 +#define ENERGY_PERF_BIAS_POWERSAVE 15 #define MSR_IA32_PACKAGE_THERM_STATUS 0x000001b1 diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index b7de5bd..36ba608 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -652,6 +652,12 @@ static const char * const energy_perf_strings[] = { "power", NULL }; +static const unsigned int epp_values[] = { + HWP_EPP_PERFORMANCE, + HWP_EPP_BALANCE_PERFORMANCE, + HWP_EPP_BALANCE_POWERSAVE, + HWP_EPP_POWERSAVE +}; static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data) { @@ -663,17 +669,14 @@ static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data) return epp; if (static_cpu_has(X86_FEATURE_HWP_EPP)) { - /* - * Range: - * 0x00-0x3F : Performance - * 0x40-0x7F : Balance performance - * 0x80-0xBF : Balance power - * 0xC0-0xFF : Power - * The EPP is a 8 bit value, but our ranges restrict the - * value which can be set. Here only using top two bits - * effectively. - */ - index = (epp >> 6) + 1; + if (epp == HWP_EPP_PERFORMANCE) + return 1; + if (epp <= HWP_EPP_BALANCE_PERFORMANCE) + return 2; + if (epp <= HWP_EPP_BALANCE_POWERSAVE) + return 3; + else + return 4; } else if (static_cpu_has(X86_FEATURE_EPB)) { /* * Range: @@ -711,15 +714,8 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data, value &= ~GENMASK_ULL(31, 24); - /* - * If epp is not default, convert from index into - * energy_perf_strings to epp value, by shifting 6 - * bits left to use only top two bits in epp. - * The resultant epp need to shifted by 24 bits to - * epp position in MSR_HWP_REQUEST. - */ if (epp == -EINVAL) - epp = (pref_index - 1) << 6; + epp = epp_values[pref_index - 1]; value |= (u64)epp << 24; ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value); diff --git a/tools/power/x86/x86_energy_perf_policy/Makefile b/tools/power/x86/x86_energy_perf_policy/Makefile index 971c9ff..a711eec 100644 --- a/tools/power/x86/x86_energy_perf_policy/Makefile +++ b/tools/power/x86/x86_energy_perf_policy/Makefile @@ -1,10 +1,27 @@ -DESTDIR ?= +CC = $(CROSS_COMPILE)gcc +BUILD_OUTPUT := $(CURDIR) +PREFIX := /usr +DESTDIR := + +ifeq ("$(origin O)", "command line") + BUILD_OUTPUT := $(O) +endif x86_energy_perf_policy : x86_energy_perf_policy.c +CFLAGS += -Wall +CFLAGS += -DMSRHEADER='"../../../../arch/x86/include/asm/msr-index.h"' + +%: %.c + @mkdir -p $(BUILD_OUTPUT) + $(CC) $(CFLAGS) $< -o $(BUILD_OUTPUT)/$@ +.PHONY : clean clean : - rm -f x86_energy_perf_policy + @rm -f $(BUILD_OUTPUT)/x86_energy_perf_policy + +install : x86_energy_perf_policy + install -d $(DESTDIR)$(PREFIX)/bin + install $(BUILD_OUTPUT)/x86_energy_perf_policy $(DESTDIR)$(PREFIX)/bin/x86_energy_perf_policy + install -d $(DESTDIR)$(PREFIX)/share/man/man8 + install x86_energy_perf_policy.8 $(DESTDIR)$(PREFIX)/share/man/man8 -install : - install x86_energy_perf_policy ${DESTDIR}/usr/bin/ - install x86_energy_perf_policy.8 ${DESTDIR}/usr/share/man/man8/ diff --git a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8 b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8 index 8eaaad6..17db1c3 100644 --- a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8 +++ b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8 @@ -1,104 +1,213 @@ -.\" This page Copyright (C) 2010 Len Brown <len.brown@intel.com> +.\" This page Copyright (C) 2010 - 2015 Len Brown <len.brown@intel.com> .\" Distributed under the GPL, Copyleft 1994. .TH X86_ENERGY_PERF_POLICY 8 .SH NAME -x86_energy_perf_policy \- read or write MSR_IA32_ENERGY_PERF_BIAS +x86_energy_perf_policy \- Manage Energy vs. Performance Policy via x86 Model Specific Registers .SH SYNOPSIS -.ft B .B x86_energy_perf_policy -.RB [ "\-c cpu" ] -.RB [ "\-v" ] -.RB "\-r" +.RB "[ options ] [ scope ] [field \ value]" .br -.B x86_energy_perf_policy -.RB [ "\-c cpu" ] -.RB [ "\-v" ] -.RB 'performance' +.RB "scope: \-\-cpu\ cpu-list | \-\-pkg\ pkg-list" .br -.B x86_energy_perf_policy -.RB [ "\-c cpu" ] -.RB [ "\-v" ] -.RB 'normal' +.RB "cpu-list, pkg-list: # | #,# | #-# | all" .br -.B x86_energy_perf_policy -.RB [ "\-c cpu" ] -.RB [ "\-v" ] -.RB 'powersave' +.RB "field: \-\-all | \-\-epb | \-\-hwp-epp | \-\-hwp-min | \-\-hwp-max | \-\-hwp-desired" .br -.B x86_energy_perf_policy -.RB [ "\-c cpu" ] -.RB [ "\-v" ] -.RB n +.RB "other: (\-\-force | \-\-hwp-enable | \-\-turbo-enable) value)" .br +.RB "value: # | default | performance | balance-performance | balance-power | power" .SH DESCRIPTION \fBx86_energy_perf_policy\fP -allows software to convey -its policy for the relative importance of performance -versus energy savings to the processor. +displays and updates energy-performance policy settings specific to +Intel Architecture Processors. Settings are accessed via Model Specific Register (MSR) +updates, no matter if the Linux cpufreq sub-system is enabled or not. -The processor uses this information in model-specific ways -when it must select trade-offs between performance and -energy efficiency. +Policy in MSR_IA32_ENERGY_PERF_BIAS (EPB) +may affect a wide range of hardware decisions, +such as how aggressively the hardware enters and exits CPU idle states (C-states) +and Processor Performance States (P-states). +This policy hint does not replace explicit OS C-state and P-state selection. +Rather, it tells the hardware how aggressively to implement those selections. +Further, it allows the OS to influence energy/performance trade-offs where there +is no software interface, such as in the opportunistic "turbo-mode" P-state range. +Note that MSR_IA32_ENERGY_PERF_BIAS is defined per CPU, +but some implementations +share a single MSR among all CPUs in each processor package. +On those systems, a write to EPB on one processor will +be visible, and will have an effect, on all CPUs +in the same processor package. -This policy hint does not supersede Processor Performance states -(P-states) or CPU Idle power states (C-states), but allows -software to have influence where it would otherwise be unable -to express a preference. +Hardware P-States (HWP) are effectively an expansion of hardware +P-state control from the opportunistic turbo-mode P-state range +to include the entire range of available P-states. +On Broadwell Xeon, the initial HWP implementation, EBP influenced HWP. +That influence was removed in subsequent generations, +where it was moved to the +Energy_Performance_Preference (EPP) field in +a pair of dedicated MSRs -- MSR_IA32_HWP_REQUEST and MSR_IA32_HWP_REQUEST_PKG. -For example, this setting may tell the hardware how -aggressively or conservatively to control frequency -in the "turbo range" above the explicitly OS-controlled -P-state frequency range. It may also tell the hardware -how aggressively is should enter the OS requested C-states. +EPP is the most commonly managed knob in HWP mode, +but MSR_IA32_HWP_REQUEST also allows the user to specify +minimum-frequency for Quality-of-Service, +and maximum-frequency for power-capping. +MSR_IA32_HWP_REQUEST is defined per-CPU. -Support for this feature is indicated by CPUID.06H.ECX.bit3 -per the Intel Architectures Software Developer's Manual. +MSR_IA32_HWP_REQUEST_PKG has the same capability as MSR_IA32_HWP_REQUEST, +but it can simultaneously set the default policy for all CPUs within a package. +A bit in per-CPU MSR_IA32_HWP_REQUEST indicates whether it is +over-ruled-by or exempt-from MSR_IA32_HWP_REQUEST_PKG. -.SS Options -\fB-c\fP limits operation to a single CPU. -The default is to operate on all CPUs. -Note that MSR_IA32_ENERGY_PERF_BIAS is defined per -logical processor, but that the initial implementations -of the MSR were shared among all processors in each package. -.PP -\fB-v\fP increases verbosity. By default -x86_energy_perf_policy is silent. -.PP -\fB-r\fP is for "read-only" mode - the unchanged state -is read and displayed. +MSR_HWP_CAPABILITIES shows the default values for the fields +in MSR_IA32_HWP_REQUEST. It is displayed when no values +are being written. + +.SS SCOPE OPTIONS .PP -.I performance -Set a policy where performance is paramount. -The processor will be unwilling to sacrifice any performance -for the sake of energy saving. This is the hardware default. +\fB-c, --cpu\fP Operate on the MSR_IA32_HWP_REQUEST for each CPU in a CPU-list. +The CPU-list may be comma-separated CPU numbers, with dash for range +or the string "all". Eg. '--cpu 1,4,6-8' or '--cpu all'. +When --cpu is used, \fB--hwp-use-pkg\fP is available, which specifies whether the per-cpu +MSR_IA32_HWP_REQUEST should be over-ruled by MSR_IA32_HWP_REQUEST_PKG (1), +or exempt from MSR_IA32_HWP_REQUEST_PKG (0). + +\fB-p, --pkg\fP Operate on the MSR_IA32_HWP_REQUEST_PKG for each package in the package-list. +The list is a string of individual package numbers separated +by commas, and or ranges of package numbers separated by a dash, +or the string "all". +For example '--pkg 1,3' or '--pkg all' + +.SS VALUE OPTIONS .PP -.I normal +.I normal | default Set a policy with a normal balance between performance and energy efficiency. The processor will tolerate minor performance compromise for potentially significant energy savings. -This reasonable default for most desktops and servers. +This is a reasonable default for most desktops and servers. +"default" is a synonym for "normal". .PP -.I powersave +.I performance +Set a policy for maximum performance, +accepting no performance sacrifice for the benefit of energy efficiency. +.PP +.I balance-performance +Set a policy with a high priority on performance, +but allowing some performance loss to benefit energy efficiency. +.PP +.I balance-power +Set a policy where the performance and power are balanced. +This is the default. +.PP +.I power Set a policy where the processor can accept -a measurable performance hit to maximize energy efficiency. +a measurable performance impact to maximize energy efficiency. + .PP -.I n -Set MSR_IA32_ENERGY_PERF_BIAS to the specified number. -The range of valid numbers is 0-15, where 0 is maximum -performance and 15 is maximum energy efficiency. +The following table shows the mapping from the value strings above to actual MSR values. +This mapping is defined in the Linux-kernel header, msr-index.h. +.nf +VALUE STRING EPB EPP +performance 0 0 +balance-performance 4 128 +normal, default 6 128 +balance-power 8 192 +power 15 255 +.fi +.PP +For MSR_IA32_HWP_REQUEST performance fields +(--hwp-min, --hwp-max, --hwp-desired), the value option +is in units of 100 MHz, Eg. 12 signifies 1200 MHz. + +.SS FIELD OPTIONS +\fB-a, --all value-string\fP Sets all EPB and EPP and HWP limit fields to the value associated with +the value-string. In addition, enables turbo-mode and HWP-mode, if they were previous disabled. +Thus "--all normal" will set a system without cpufreq into a well known configuration. +.PP +\fB-B, --epb\fP set EPB per-core or per-package. +See value strings in the table above. +.PP +\fB-d, --debug\fP debug increases verbosity. By default +x86_energy_perf_policy is silent for updates, +and verbose for read-only mode. +.PP +\fB-P, --hwp-epp\fP set HWP.EPP per-core or per-package. +See value strings in the table above. +.PP +\fB-m, --hwp-min\fP request HWP to not go below the specified core/bus ratio. +The "default" is the value found in IA32_HWP_CAPABILITIES.min. +.PP +\fB-M, --hwp-max\fP request HWP not exceed a the specified core/bus ratio. +The "default" is the value found in IA32_HWP_CAPABILITIES.max. +.PP +\fB-D, --hwp-desired\fP request HWP 'desired' frequency. +The "normal" setting is 0, which +corresponds to 'full autonomous' HWP control. +Non-zero performance values request a specific performance +level on this processor, specified in multiples of 100 MHz. +.PP +\fB-w, --hwp-window\fP specify integer number of microsec +in the sliding window that HWP uses to maintain average frequency. +This parameter is meaningful only when the "desired" field above is non-zero. +Default is 0, allowing the HW to choose. +.SH OTHER OPTIONS +.PP +\fB-f, --force\fP writes the specified values without bounds checking. +.PP +\fB-U, --hwp-use-pkg\fP (0 | 1), when used in conjunction with --cpu, +indicates whether the per-CPU MSR_IA32_HWP_REQUEST should be overruled (1) +or exempt (0) from per-Package MSR_IA32_HWP_REQUEST_PKG settings. +The default is exempt. +.PP +\fB-H, --hwp-enable\fP enable HardWare-P-state (HWP) mode. Once enabled, system RESET is required to disable HWP mode. +.PP +\fB-t, --turbo-enable\fP enable (1) or disable (0) turbo mode. +.PP +\fB-v, --version\fP print version and exit. +.PP +If no request to change policy is made, +the default behavior is to read +and display the current system state, +including the default capabilities. +.SH WARNING +.PP +This utility writes directly to Model Specific Registers. +There is no locking or coordination should this utility +be used to modify HWP limit fields at the same time that +intel_pstate's sysfs attributes access the same MSRs. +.PP +Note that --hwp-desired and --hwp-window are considered experimental. +Future versions of Linux reserve the right to access these +fields internally -- potentially conflicting with user-space access. +.SH EXAMPLE +.nf +# sudo x86_energy_perf_policy +cpu0: EPB 6 +cpu0: HWP_REQ: min 6 max 35 des 0 epp 128 window 0x0 (0*10^0us) use_pkg 0 +cpu0: HWP_CAP: low 1 eff 8 guar 27 high 35 +cpu1: EPB 6 +cpu1: HWP_REQ: min 6 max 35 des 0 epp 128 window 0x0 (0*10^0us) use_pkg 0 +cpu1: HWP_CAP: low 1 eff 8 guar 27 high 35 +cpu2: EPB 6 +cpu2: HWP_REQ: min 6 max 35 des 0 epp 128 window 0x0 (0*10^0us) use_pkg 0 +cpu2: HWP_CAP: low 1 eff 8 guar 27 high 35 +cpu3: EPB 6 +cpu3: HWP_REQ: min 6 max 35 des 0 epp 128 window 0x0 (0*10^0us) use_pkg 0 +cpu3: HWP_CAP: low 1 eff 8 guar 27 high 35 +.fi .SH NOTES -.B "x86_energy_perf_policy " +.B "x86_energy_perf_policy" runs only as root. .SH FILES .ta .nf /dev/cpu/*/msr .fi - .SH "SEE ALSO" +.nf msr(4) +Intel(R) 64 and IA-32 Architectures Software Developer's Manual +.fi .PP .SH AUTHORS .nf -Written by Len Brown <len.brown@intel.com> +Len Brown diff --git a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c index 40b3e54..65bbe62 100644 --- a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c +++ b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c @@ -3,322 +3,1424 @@ * policy preference bias on recent X86 processors. */ /* - * Copyright (c) 2010, Intel Corporation. + * Copyright (c) 2010 - 2017 Intel Corporation. * Len Brown <len.brown@intel.com> * - * 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., - * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * This program is released under GPL v2 */ +#define _GNU_SOURCE +#include MSRHEADER #include <stdio.h> #include <unistd.h> #include <sys/types.h> +#include <sched.h> #include <sys/stat.h> #include <sys/resource.h> +#include <getopt.h> +#include <err.h> #include <fcntl.h> #include <signal.h> #include <sys/time.h> +#include <limits.h> #include <stdlib.h> #include <string.h> +#include <cpuid.h> +#include <errno.h> + +#define OPTARG_NORMAL (INT_MAX - 1) +#define OPTARG_POWER (INT_MAX - 2) +#define OPTARG_BALANCE_POWER (INT_MAX - 3) +#define OPTARG_BALANCE_PERFORMANCE (INT_MAX - 4) +#define OPTARG_PERFORMANCE (INT_MAX - 5) + +struct msr_hwp_cap { + unsigned char highest; + unsigned char guaranteed; + unsigned char efficient; + unsigned char lowest; +}; -unsigned int verbose; /* set with -v */ -unsigned int read_only; /* set with -r */ +struct msr_hwp_request { + unsigned char hwp_min; + unsigned char hwp_max; + unsigned char hwp_desired; + unsigned char hwp_epp; + unsigned int hwp_window; + unsigned char hwp_use_pkg; +} req_update; + +unsigned int debug; +unsigned int verbose; +unsigned int force; char *progname; -unsigned long long new_bias; -int cpu = -1; +int base_cpu; +unsigned char update_epb; +unsigned long long new_epb; +unsigned char turbo_is_enabled; +unsigned char update_turbo; +unsigned char turbo_update_value; +unsigned char update_hwp_epp; +unsigned char update_hwp_min; +unsigned char update_hwp_max; +unsigned char update_hwp_desired; +unsigned char update_hwp_window; +unsigned char update_hwp_use_pkg; +unsigned char update_hwp_enable; +#define hwp_update_enabled() (update_hwp_enable | update_hwp_epp | update_hwp_max | update_hwp_min | update_hwp_desired | update_hwp_window | update_hwp_use_pkg) +int max_cpu_num; +int max_pkg_num; +#define MAX_PACKAGES 64 +unsigned int first_cpu_in_pkg[MAX_PACKAGES]; +unsigned long long pkg_present_set; +unsigned long long pkg_selected_set; +cpu_set_t *cpu_present_set; +cpu_set_t *cpu_selected_set; +int genuine_intel; + +size_t cpu_setsize; + +char *proc_stat = "/proc/stat"; + +unsigned int has_epb; /* MSR_IA32_ENERGY_PERF_BIAS */ +unsigned int has_hwp; /* IA32_PM_ENABLE, IA32_HWP_CAPABILITIES */ + /* IA32_HWP_REQUEST, IA32_HWP_STATUS */ +unsigned int has_hwp_notify; /* IA32_HWP_INTERRUPT */ +unsigned int has_hwp_activity_window; /* IA32_HWP_REQUEST[bits 41:32] */ +unsigned int has_hwp_epp; /* IA32_HWP_REQUEST[bits 31:24] */ +unsigned int has_hwp_request_pkg; /* IA32_HWP_REQUEST_PKG */ + +unsigned int bdx_highest_ratio; /* - * Usage: - * - * -c cpu: limit action to a single CPU (default is all CPUs) - * -v: verbose output (can invoke more than once) - * -r: read-only, don't change any settings - * - * performance - * Performance is paramount. - * Unwilling to sacrifice any performance - * for the sake of energy saving. (hardware default) - * - * normal - * Can tolerate minor performance compromise - * for potentially significant energy savings. - * (reasonable default for most desktops and servers) - * - * powersave - * Can tolerate significant performance hit - * to maximize energy savings. - * - * n - * a numerical value to write to the underlying MSR. + * maintain compatibility with original implementation, but don't document it: */ void usage(void) { - printf("%s: [-c cpu] [-v] " - "(-r | 'performance' | 'normal' | 'powersave' | n)\n", - progname); + fprintf(stderr, "%s [options] [scope][field value]\n", progname); + fprintf(stderr, "scope: --cpu cpu-list [--hwp-use-pkg #] | --pkg pkg-list\n"); + fprintf(stderr, "field: --all | --epb | --hwp-epp | --hwp-min | --hwp-max | --hwp-desired\n"); + fprintf(stderr, "other: --hwp-enable | --turbo-enable (0 | 1) | --help | --force\n"); + fprintf(stderr, + "value: ( # | \"normal\" | \"performance\" | \"balance-performance\" | \"balance-power\"| \"power\")\n"); + fprintf(stderr, "--hwp-window usec\n"); + + fprintf(stderr, "Specify only Energy Performance BIAS (legacy usage):\n"); + fprintf(stderr, "%s: [-c cpu] [-v] (-r | policy-value )\n", progname); + exit(1); } -#define MSR_IA32_ENERGY_PERF_BIAS 0x000001b0 +/* + * If bdx_highest_ratio is set, + * then we must translate between MSR format and simple ratio + * used on the cmdline. + */ +int ratio_2_msr_perf(int ratio) +{ + int msr_perf; + + if (!bdx_highest_ratio) + return ratio; + + msr_perf = ratio * 255 / bdx_highest_ratio; + + if (debug) + fprintf(stderr, "%d = ratio_to_msr_perf(%d)\n", msr_perf, ratio); + + return msr_perf; +} +int msr_perf_2_ratio(int msr_perf) +{ + int ratio; + double d; + + if (!bdx_highest_ratio) + return msr_perf; + + d = (double)msr_perf * (double) bdx_highest_ratio / 255.0; + d = d + 0.5; /* round */ + ratio = (int)d; + + if (debug) + fprintf(stderr, "%d = msr_perf_ratio(%d) {%f}\n", ratio, msr_perf, d); + + return ratio; +} +int parse_cmdline_epb(int i) +{ + if (!has_epb) + errx(1, "EPB not enabled on this platform"); + + update_epb = 1; + + switch (i) { + case OPTARG_POWER: + return ENERGY_PERF_BIAS_POWERSAVE; + case OPTARG_BALANCE_POWER: + return ENERGY_PERF_BIAS_BALANCE_POWERSAVE; + case OPTARG_NORMAL: + return ENERGY_PERF_BIAS_NORMAL; + case OPTARG_BALANCE_PERFORMANCE: + return ENERGY_PERF_BIAS_BALANCE_PERFORMANCE; + case OPTARG_PERFORMANCE: + return ENERGY_PERF_BIAS_PERFORMANCE; + } + if (i < 0 || i > ENERGY_PERF_BIAS_POWERSAVE) + errx(1, "--epb must be from 0 to 15"); + return i; +} + +#define HWP_CAP_LOWEST 0 +#define HWP_CAP_HIGHEST 255 + +/* + * "performance" changes hwp_min to cap.highest + * All others leave it at cap.lowest + */ +int parse_cmdline_hwp_min(int i) +{ + update_hwp_min = 1; + + switch (i) { + case OPTARG_POWER: + case OPTARG_BALANCE_POWER: + case OPTARG_NORMAL: + case OPTARG_BALANCE_PERFORMANCE: + return HWP_CAP_LOWEST; + case OPTARG_PERFORMANCE: + return HWP_CAP_HIGHEST; + } + return i; +} +/* + * "power" changes hwp_max to cap.lowest + * All others leave it at cap.highest + */ +int parse_cmdline_hwp_max(int i) +{ + update_hwp_max = 1; + + switch (i) { + case OPTARG_POWER: + return HWP_CAP_LOWEST; + case OPTARG_NORMAL: + case OPTARG_BALANCE_POWER: + case OPTARG_BALANCE_PERFORMANCE: + case OPTARG_PERFORMANCE: + return HWP_CAP_HIGHEST; + } + return i; +} +/* + * for --hwp-des, all strings leave it in autonomous mode + * If you want to change it, you need to explicitly pick a value + */ +int parse_cmdline_hwp_desired(int i) +{ + update_hwp_desired = 1; + + switch (i) { + case OPTARG_POWER: + case OPTARG_BALANCE_POWER: + case OPTARG_BALANCE_PERFORMANCE: + case OPTARG_NORMAL: + case OPTARG_PERFORMANCE: + return 0; /* autonomous */ + } + return i; +} + +int parse_cmdline_hwp_window(int i) +{ + unsigned int exponent; + + update_hwp_window = 1; + + switch (i) { + case OPTARG_POWER: + case OPTARG_BALANCE_POWER: + case OPTARG_NORMAL: + case OPTARG_BALANCE_PERFORMANCE: + case OPTARG_PERFORMANCE: + return 0; + } + if (i < 0 || i > 1270000000) { + fprintf(stderr, "--hwp-window: 0 for auto; 1 - 1270000000 usec for window duration\n"); + usage(); + } + for (exponent = 0; ; ++exponent) { + if (debug) + printf("%d 10^%d\n", i, exponent); + + if (i <= 127) + break; + + i = i / 10; + } + if (debug) + fprintf(stderr, "%d*10^%d: 0x%x\n", i, exponent, (exponent << 7) | i); + + return (exponent << 7) | i; +} +int parse_cmdline_hwp_epp(int i) +{ + update_hwp_epp = 1; + + switch (i) { + case OPTARG_POWER: + return HWP_EPP_POWERSAVE; + case OPTARG_BALANCE_POWER: + return HWP_EPP_BALANCE_POWERSAVE; + case OPTARG_NORMAL: + case OPTARG_BALANCE_PERFORMANCE: + return HWP_EPP_BALANCE_PERFORMANCE; + case OPTARG_PERFORMANCE: + return HWP_EPP_PERFORMANCE; + } + if (i < 0 || i > 0xff) { + fprintf(stderr, "--hwp-epp must be from 0 to 0xff\n"); + usage(); + } + return i; +} +int parse_cmdline_turbo(int i) +{ + update_turbo = 1; + + switch (i) { + case OPTARG_POWER: + return 0; + case OPTARG_NORMAL: + case OPTARG_BALANCE_POWER: + case OPTARG_BALANCE_PERFORMANCE: + case OPTARG_PERFORMANCE: + return 1; + } + if (i < 0 || i > 1) { + fprintf(stderr, "--turbo-enable: 1 to enable, 0 to disable\n"); + usage(); + } + return i; +} + +int parse_optarg_string(char *s) +{ + int i; + char *endptr; + + if (!strncmp(s, "default", 7)) + return OPTARG_NORMAL; + + if (!strncmp(s, "normal", 6)) + return OPTARG_NORMAL; + + if (!strncmp(s, "power", 9)) + return OPTARG_POWER; + + if (!strncmp(s, "balance-power", 17)) + return OPTARG_BALANCE_POWER; + + if (!strncmp(s, "balance-performance", 19)) + return OPTARG_BALANCE_PERFORMANCE; + + if (!strncmp(s, "performance", 11)) + return OPTARG_PERFORMANCE; + + i = strtol(s, &endptr, 0); + if (s == endptr) { + fprintf(stderr, "no digits in \"%s\"\n", s); + usage(); + } + if (i == LONG_MIN || i == LONG_MAX) + errx(-1, "%s", s); + + if (i > 0xFF) + errx(-1, "%d (0x%x) must be < 256", i, i); + + if (i < 0) + errx(-1, "%d (0x%x) must be >= 0", i, i); + return i; +} + +void parse_cmdline_all(char *s) +{ + force++; + update_hwp_enable = 1; + req_update.hwp_min = parse_cmdline_hwp_min(parse_optarg_string(s)); + req_update.hwp_max = parse_cmdline_hwp_max(parse_optarg_string(s)); + req_update.hwp_epp = parse_cmdline_hwp_epp(parse_optarg_string(s)); + if (has_epb) + new_epb = parse_cmdline_epb(parse_optarg_string(s)); + turbo_update_value = parse_cmdline_turbo(parse_optarg_string(s)); + req_update.hwp_desired = parse_cmdline_hwp_desired(parse_optarg_string(s)); + req_update.hwp_window = parse_cmdline_hwp_window(parse_optarg_string(s)); +} + +void validate_cpu_selected_set(void) +{ + int cpu; + + if (CPU_COUNT_S(cpu_setsize, cpu_selected_set) == 0) + errx(0, "no CPUs requested"); + + for (cpu = 0; cpu <= max_cpu_num; ++cpu) { + if (CPU_ISSET_S(cpu, cpu_setsize, cpu_selected_set)) + if (!CPU_ISSET_S(cpu, cpu_setsize, cpu_present_set)) + errx(1, "Requested cpu% is not present", cpu); + } +} + +void parse_cmdline_cpu(char *s) +{ + char *startp, *endp; + int cpu = 0; + + if (pkg_selected_set) { + usage(); + errx(1, "--cpu | --pkg"); + } + cpu_selected_set = CPU_ALLOC((max_cpu_num + 1)); + if (cpu_selected_set == NULL) + err(1, "cpu_selected_set"); + CPU_ZERO_S(cpu_setsize, cpu_selected_set); + + for (startp = s; startp && *startp;) { + + if (*startp == ',') { + startp++; + continue; + } + + if (*startp == '-') { + int end_cpu; -#define BIAS_PERFORMANCE 0 -#define BIAS_BALANCE 6 -#define BIAS_POWERSAVE 15 + startp++; + end_cpu = strtol(startp, &endp, 10); + if (startp == endp) + continue; + + while (cpu <= end_cpu) { + if (cpu > max_cpu_num) + errx(1, "Requested cpu%d exceeds max cpu%d", cpu, max_cpu_num); + CPU_SET_S(cpu, cpu_setsize, cpu_selected_set); + cpu++; + } + startp = endp; + continue; + } + + if (strncmp(startp, "all", 3) == 0) { + for (cpu = 0; cpu <= max_cpu_num; cpu += 1) { + if (CPU_ISSET_S(cpu, cpu_setsize, cpu_present_set)) + CPU_SET_S(cpu, cpu_setsize, cpu_selected_set); + } + startp += 3; + if (*startp == 0) + break; + } + /* "--cpu even" is not documented */ + if (strncmp(startp, "even", 4) == 0) { + for (cpu = 0; cpu <= max_cpu_num; cpu += 2) { + if (CPU_ISSET_S(cpu, cpu_setsize, cpu_present_set)) + CPU_SET_S(cpu, cpu_setsize, cpu_selected_set); + } + startp += 4; + if (*startp == 0) + break; + } + + /* "--cpu odd" is not documented */ + if (strncmp(startp, "odd", 3) == 0) { + for (cpu = 1; cpu <= max_cpu_num; cpu += 2) { + if (CPU_ISSET_S(cpu, cpu_setsize, cpu_present_set)) + CPU_SET_S(cpu, cpu_setsize, cpu_selected_set); + } + startp += 3; + if (*startp == 0) + break; + } + + cpu = strtol(startp, &endp, 10); + if (startp == endp) + errx(1, "--cpu cpu-set: confused by '%s'", startp); + if (cpu > max_cpu_num) + errx(1, "Requested cpu%d exceeds max cpu%d", cpu, max_cpu_num); + CPU_SET_S(cpu, cpu_setsize, cpu_selected_set); + startp = endp; + } + + validate_cpu_selected_set(); + +} + +void parse_cmdline_pkg(char *s) +{ + char *startp, *endp; + int pkg = 0; + + if (cpu_selected_set) { + usage(); + errx(1, "--pkg | --cpu"); + } + pkg_selected_set = 0; + + for (startp = s; startp && *startp;) { + + if (*startp == ',') { + startp++; + continue; + } + + if (*startp == '-') { + int end_pkg; + + startp++; + end_pkg = strtol(startp, &endp, 10); + if (startp == endp) + continue; + + while (pkg <= end_pkg) { + if (pkg > max_pkg_num) + errx(1, "Requested pkg%d exceeds max pkg%d", pkg, max_pkg_num); + pkg_selected_set |= 1 << pkg; + pkg++; + } + startp = endp; + continue; + } + + if (strncmp(startp, "all", 3) == 0) { + pkg_selected_set = pkg_present_set; + return; + } + + pkg = strtol(startp, &endp, 10); + if (pkg > max_pkg_num) + errx(1, "Requested pkg%d Exceeds max pkg%d", pkg, max_pkg_num); + pkg_selected_set |= 1 << pkg; + startp = endp; + } +} + +void for_packages(unsigned long long pkg_set, int (func)(int)) +{ + int pkg_num; + + for (pkg_num = 0; pkg_num <= max_pkg_num; ++pkg_num) { + if (pkg_set & (1UL << pkg_num)) + func(pkg_num); + } +} + +void print_version(void) +{ + printf("x86_energy_perf_policy 17.05.11 (C) Len Brown <len.brown@intel.com>\n"); +} void cmdline(int argc, char **argv) { int opt; + int option_index = 0; + + static struct option long_options[] = { + {"all", required_argument, 0, 'a'}, + {"cpu", required_argument, 0, 'c'}, + {"pkg", required_argument, 0, 'p'}, + {"debug", no_argument, 0, 'd'}, + {"hwp-desired", required_argument, 0, 'D'}, + {"epb", required_argument, 0, 'B'}, + {"force", no_argument, 0, 'f'}, + {"hwp-enable", no_argument, 0, 'e'}, + {"help", no_argument, 0, 'h'}, + {"hwp-epp", required_argument, 0, 'P'}, + {"hwp-min", required_argument, 0, 'm'}, + {"hwp-max", required_argument, 0, 'M'}, + {"read", no_argument, 0, 'r'}, + {"turbo-enable", required_argument, 0, 't'}, + {"hwp-use-pkg", required_argument, 0, 'u'}, + {"version", no_argument, 0, 'v'}, + {"hwp-window", required_argument, 0, 'w'}, + {0, 0, 0, 0 } + }; progname = argv[0]; - while ((opt = getopt(argc, argv, "+rvc:")) != -1) { + while ((opt = getopt_long_only(argc, argv, "+a:c:dD:E:e:f:m:M:rt:u:vw", + long_options, &option_index)) != -1) { switch (opt) { + case 'a': + parse_cmdline_all(optarg); + break; + case 'B': + new_epb = parse_cmdline_epb(parse_optarg_string(optarg)); + break; case 'c': - cpu = atoi(optarg); + parse_cmdline_cpu(optarg); + break; + case 'e': + update_hwp_enable = 1; + break; + case 'h': + usage(); + break; + case 'd': + debug++; + verbose++; + break; + case 'f': + force++; + break; + case 'D': + req_update.hwp_desired = parse_cmdline_hwp_desired(parse_optarg_string(optarg)); + break; + case 'm': + req_update.hwp_min = parse_cmdline_hwp_min(parse_optarg_string(optarg)); + break; + case 'M': + req_update.hwp_max = parse_cmdline_hwp_max(parse_optarg_string(optarg)); + break; + case 'p': + parse_cmdline_pkg(optarg); + break; + case 'P': + req_update.hwp_epp = parse_cmdline_hwp_epp(parse_optarg_string(optarg)); break; case 'r': - read_only = 1; + /* v1 used -r to specify read-only mode, now the default */ + break; + case 't': + turbo_update_value = parse_cmdline_turbo(parse_optarg_string(optarg)); + break; + case 'u': + update_hwp_use_pkg++; + if (atoi(optarg) == 0) + req_update.hwp_use_pkg = 0; + else + req_update.hwp_use_pkg = 1; break; case 'v': - verbose++; + print_version(); + exit(0); + break; + case 'w': + req_update.hwp_window = parse_cmdline_hwp_window(parse_optarg_string(optarg)); break; default: usage(); } } - /* if -r, then should be no additional optind */ - if (read_only && (argc > optind)) - usage(); - /* - * if no -r , then must be one additional optind + * v1 allowed "performance"|"normal"|"power" with no policy specifier + * to update BIAS. Continue to support that, even though no longer documented. */ - if (!read_only) { + if (argc == optind + 1) + new_epb = parse_cmdline_epb(parse_optarg_string(argv[optind])); - if (argc != optind + 1) { - printf("must supply -r or policy param\n"); - usage(); - } + if (argc > optind + 1) { + fprintf(stderr, "stray parameter '%s'\n", argv[optind + 1]); + usage(); + } +} - if (!strcmp("performance", argv[optind])) { - new_bias = BIAS_PERFORMANCE; - } else if (!strcmp("normal", argv[optind])) { - new_bias = BIAS_BALANCE; - } else if (!strcmp("powersave", argv[optind])) { - new_bias = BIAS_POWERSAVE; - } else { - char *endptr; - - new_bias = strtoull(argv[optind], &endptr, 0); - if (endptr == argv[optind] || - new_bias > BIAS_POWERSAVE) { - fprintf(stderr, "invalid value: %s\n", - argv[optind]); - usage(); - } - } + +int get_msr(int cpu, int offset, unsigned long long *msr) +{ + int retval; + char pathname[32]; + int fd; + + sprintf(pathname, "/dev/cpu/%d/msr", cpu); + fd = open(pathname, O_RDONLY); + if (fd < 0) + err(-1, "%s open failed, try chown or chmod +r /dev/cpu/*/msr, or run as root", pathname); + + retval = pread(fd, msr, sizeof(*msr), offset); + if (retval != sizeof(*msr)) + err(-1, "%s offset 0x%llx read failed", pathname, (unsigned long long)offset); + + if (debug > 1) + fprintf(stderr, "get_msr(cpu%d, 0x%X, 0x%llX)\n", cpu, offset, *msr); + + close(fd); + return 0; +} + +int put_msr(int cpu, int offset, unsigned long long new_msr) +{ + char pathname[32]; + int retval; + int fd; + + sprintf(pathname, "/dev/cpu/%d/msr", cpu); + fd = open(pathname, O_RDWR); + if (fd < 0) + err(-1, "%s open failed, try chown or chmod +r /dev/cpu/*/msr, or run as root", pathname); + + retval = pwrite(fd, &new_msr, sizeof(new_msr), offset); + if (retval != sizeof(new_msr)) + err(-2, "pwrite(cpu%d, offset 0x%x, 0x%llx) = %d", cpu, offset, new_msr, retval); + + close(fd); + + if (debug > 1) + fprintf(stderr, "put_msr(cpu%d, 0x%X, 0x%llX)\n", cpu, offset, new_msr); + + return 0; +} + +void print_hwp_cap(int cpu, struct msr_hwp_cap *cap, char *str) +{ + if (cpu != -1) + printf("cpu%d: ", cpu); + + printf("HWP_CAP: low %d eff %d guar %d high %d\n", + cap->lowest, cap->efficient, cap->guaranteed, cap->highest); +} +void read_hwp_cap(int cpu, struct msr_hwp_cap *cap, unsigned int msr_offset) +{ + unsigned long long msr; + + get_msr(cpu, msr_offset, &msr); + + cap->highest = msr_perf_2_ratio(HWP_HIGHEST_PERF(msr)); + cap->guaranteed = msr_perf_2_ratio(HWP_GUARANTEED_PERF(msr)); + cap->efficient = msr_perf_2_ratio(HWP_MOSTEFFICIENT_PERF(msr)); + cap->lowest = msr_perf_2_ratio(HWP_LOWEST_PERF(msr)); +} + +void print_hwp_request(int cpu, struct msr_hwp_request *h, char *str) +{ + if (cpu != -1) + printf("cpu%d: ", cpu); + + if (str) + printf("%s", str); + + printf("HWP_REQ: min %d max %d des %d epp %d window 0x%x (%d*10^%dus) use_pkg %d\n", + h->hwp_min, h->hwp_max, h->hwp_desired, h->hwp_epp, + h->hwp_window, h->hwp_window & 0x7F, (h->hwp_window >> 7) & 0x7, h->hwp_use_pkg); +} +void print_hwp_request_pkg(int pkg, struct msr_hwp_request *h, char *str) +{ + printf("pkg%d: ", pkg); + + if (str) + printf("%s", str); + + printf("HWP_REQ_PKG: min %d max %d des %d epp %d window 0x%x (%d*10^%dus)\n", + h->hwp_min, h->hwp_max, h->hwp_desired, h->hwp_epp, + h->hwp_window, h->hwp_window & 0x7F, (h->hwp_window >> 7) & 0x7); +} +void read_hwp_request(int cpu, struct msr_hwp_request *hwp_req, unsigned int msr_offset) +{ + unsigned long long msr; + + get_msr(cpu, msr_offset, &msr); + + hwp_req->hwp_min = msr_perf_2_ratio((((msr) >> 0) & 0xff)); + hwp_req->hwp_max = msr_perf_2_ratio((((msr) >> 8) & 0xff)); + hwp_req->hwp_desired = msr_perf_2_ratio((((msr) >> 16) & 0xff)); + hwp_req->hwp_epp = (((msr) >> 24) & 0xff); + hwp_req->hwp_window = (((msr) >> 32) & 0x3ff); + hwp_req->hwp_use_pkg = (((msr) >> 42) & 0x1); +} + +void write_hwp_request(int cpu, struct msr_hwp_request *hwp_req, unsigned int msr_offset) +{ + unsigned long long msr = 0; + + if (debug > 1) + printf("cpu%d: requesting min %d max %d des %d epp %d window 0x%0x use_pkg %d\n", + cpu, hwp_req->hwp_min, hwp_req->hwp_max, + hwp_req->hwp_desired, hwp_req->hwp_epp, + hwp_req->hwp_window, hwp_req->hwp_use_pkg); + + msr |= HWP_MIN_PERF(ratio_2_msr_perf(hwp_req->hwp_min)); + msr |= HWP_MAX_PERF(ratio_2_msr_perf(hwp_req->hwp_max)); + msr |= HWP_DESIRED_PERF(ratio_2_msr_perf(hwp_req->hwp_desired)); + msr |= HWP_ENERGY_PERF_PREFERENCE(hwp_req->hwp_epp); + msr |= HWP_ACTIVITY_WINDOW(hwp_req->hwp_window); + msr |= HWP_PACKAGE_CONTROL(hwp_req->hwp_use_pkg); + + put_msr(cpu, msr_offset, msr); +} + +int print_cpu_msrs(int cpu) +{ + unsigned long long msr; + struct msr_hwp_request req; + struct msr_hwp_cap cap; + + if (has_epb) { + get_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, &msr); + + printf("cpu%d: EPB %u\n", cpu, (unsigned int) msr); } + + if (!has_hwp) + return 0; + + read_hwp_request(cpu, &req, MSR_HWP_REQUEST); + print_hwp_request(cpu, &req, ""); + + read_hwp_cap(cpu, &cap, MSR_HWP_CAPABILITIES); + print_hwp_cap(cpu, &cap, ""); + + return 0; +} + +int print_pkg_msrs(int pkg) +{ + struct msr_hwp_request req; + unsigned long long msr; + + if (!has_hwp) + return 0; + + read_hwp_request(first_cpu_in_pkg[pkg], &req, MSR_HWP_REQUEST_PKG); + print_hwp_request_pkg(pkg, &req, ""); + + if (has_hwp_notify) { + get_msr(first_cpu_in_pkg[pkg], MSR_HWP_INTERRUPT, &msr); + fprintf(stderr, + "pkg%d: MSR_HWP_INTERRUPT: 0x%08llx (Excursion_Min-%sabled, Guaranteed_Perf_Change-%sabled)\n", + pkg, msr, + ((msr) & 0x2) ? "EN" : "Dis", + ((msr) & 0x1) ? "EN" : "Dis"); + } + get_msr(first_cpu_in_pkg[pkg], MSR_HWP_STATUS, &msr); + fprintf(stderr, + "pkg%d: MSR_HWP_STATUS: 0x%08llx (%sExcursion_Min, %sGuaranteed_Perf_Change)\n", + pkg, msr, + ((msr) & 0x4) ? "" : "No-", + ((msr) & 0x1) ? "" : "No-"); + + return 0; } /* - * validate_cpuid() - * returns on success, quietly exits on failure (make verbose with -v) + * Assumption: All HWP systems have 100 MHz bus clock */ -void validate_cpuid(void) +int ratio_2_sysfs_khz(int ratio) { - unsigned int eax, ebx, ecx, edx, max_level; - unsigned int fms, family, model, stepping; + int bclk_khz = 100 * 1000; /* 100,000 KHz = 100 MHz */ - eax = ebx = ecx = edx = 0; + return ratio * bclk_khz; +} +/* + * If HWP is enabled and cpufreq sysfs attribtes are present, + * then update sysfs, so that it will not become + * stale when we write to MSRs. + * (intel_pstate's max_perf_pct and min_perf_pct will follow cpufreq, + * so we don't have to touch that.) + */ +void update_cpufreq_scaling_freq(int is_max, int cpu, unsigned int ratio) +{ + char pathname[64]; + FILE *fp; + int retval; + int khz; - asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), - "=d" (edx) : "a" (0)); + sprintf(pathname, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_%s_freq", + cpu, is_max ? "max" : "min"); - if (ebx != 0x756e6547 || edx != 0x49656e69 || ecx != 0x6c65746e) { - if (verbose) - fprintf(stderr, "%.4s%.4s%.4s != GenuineIntel", - (char *)&ebx, (char *)&edx, (char *)&ecx); - exit(1); + fp = fopen(pathname, "w"); + if (!fp) { + if (debug) + perror(pathname); + return; } - asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx"); - family = (fms >> 8) & 0xf; - model = (fms >> 4) & 0xf; - stepping = fms & 0xf; - if (family == 6 || family == 0xf) - model += ((fms >> 16) & 0xf) << 4; + khz = ratio_2_sysfs_khz(ratio); + retval = fprintf(fp, "%d", khz); + if (retval < 0) + if (debug) + perror("fprintf"); + if (debug) + printf("echo %d > %s\n", khz, pathname); - if (verbose > 1) - printf("CPUID %d levels family:model:stepping " - "0x%x:%x:%x (%d:%d:%d)\n", max_level, - family, model, stepping, family, model, stepping); + fclose(fp); +} - if (!(edx & (1 << 5))) { - if (verbose) - printf("CPUID: no MSR\n"); - exit(1); +/* + * We update all sysfs before updating any MSRs because of + * bugs in cpufreq/intel_pstate where the sysfs writes + * for a CPU may change the min/max values on other CPUS. + */ + +int update_sysfs(int cpu) +{ + if (!has_hwp) + return 0; + + if (!hwp_update_enabled()) + return 0; + + if (access("/sys/devices/system/cpu/cpu0/cpufreq", F_OK)) + return 0; + + if (update_hwp_min) + update_cpufreq_scaling_freq(0, cpu, req_update.hwp_min); + + if (update_hwp_max) + update_cpufreq_scaling_freq(1, cpu, req_update.hwp_max); + + return 0; +} + +int verify_hwp_req_self_consistency(int cpu, struct msr_hwp_request *req) +{ + /* fail if min > max requested */ + if (req->hwp_min > req->hwp_max) { + errx(1, "cpu%d: requested hwp-min %d > hwp_max %d", + cpu, req->hwp_min, req->hwp_max); } - /* - * Support for MSR_IA32_ENERGY_PERF_BIAS - * is indicated by CPUID.06H.ECX.bit3 - */ - asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (6)); - if (verbose) - printf("CPUID.06H.ECX: 0x%x\n", ecx); - if (!(ecx & (1 << 3))) { - if (verbose) - printf("CPUID: No MSR_IA32_ENERGY_PERF_BIAS\n"); - exit(1); + /* fail if desired > max requestd */ + if (req->hwp_desired && (req->hwp_desired > req->hwp_max)) { + errx(1, "cpu%d: requested hwp-desired %d > hwp_max %d", + cpu, req->hwp_desired, req->hwp_max); } - return; /* success */ + /* fail if desired < min requestd */ + if (req->hwp_desired && (req->hwp_desired < req->hwp_min)) { + errx(1, "cpu%d: requested hwp-desired %d < requested hwp_min %d", + cpu, req->hwp_desired, req->hwp_min); + } + + return 0; } -unsigned long long get_msr(int cpu, int offset) +int check_hwp_request_v_hwp_capabilities(int cpu, struct msr_hwp_request *req, struct msr_hwp_cap *cap) { - unsigned long long msr; - char msr_path[32]; - int retval; - int fd; + if (update_hwp_max) { + if (req->hwp_max > cap->highest) + errx(1, "cpu%d: requested max %d > capabilities highest %d, use --force?", + cpu, req->hwp_max, cap->highest); + if (req->hwp_max < cap->lowest) + errx(1, "cpu%d: requested max %d < capabilities lowest %d, use --force?", + cpu, req->hwp_max, cap->lowest); + } - sprintf(msr_path, "/dev/cpu/%d/msr", cpu); - fd = open(msr_path, O_RDONLY); - if (fd < 0) { - printf("Try \"# modprobe msr\"\n"); - perror(msr_path); - exit(1); + if (update_hwp_min) { + if (req->hwp_min > cap->highest) + errx(1, "cpu%d: requested min %d > capabilities highest %d, use --force?", + cpu, req->hwp_min, cap->highest); + if (req->hwp_min < cap->lowest) + errx(1, "cpu%d: requested min %d < capabilities lowest %d, use --force?", + cpu, req->hwp_min, cap->lowest); } - retval = pread(fd, &msr, sizeof msr, offset); + if (update_hwp_min && update_hwp_max && (req->hwp_min > req->hwp_max)) + errx(1, "cpu%d: requested min %d > requested max %d", + cpu, req->hwp_min, req->hwp_max); - if (retval != sizeof msr) { - printf("pread cpu%d 0x%x = %d\n", cpu, offset, retval); - exit(-2); + if (update_hwp_desired && req->hwp_desired) { + if (req->hwp_desired > req->hwp_max) + errx(1, "cpu%d: requested desired %d > requested max %d, use --force?", + cpu, req->hwp_desired, req->hwp_max); + if (req->hwp_desired < req->hwp_min) + errx(1, "cpu%d: requested desired %d < requested min %d, use --force?", + cpu, req->hwp_desired, req->hwp_min); + if (req->hwp_desired < cap->lowest) + errx(1, "cpu%d: requested desired %d < capabilities lowest %d, use --force?", + cpu, req->hwp_desired, cap->lowest); + if (req->hwp_desired > cap->highest) + errx(1, "cpu%d: requested desired %d > capabilities highest %d, use --force?", + cpu, req->hwp_desired, cap->highest); } - close(fd); - return msr; + + return 0; } -unsigned long long put_msr(int cpu, unsigned long long new_msr, int offset) +int update_hwp_request(int cpu) { - unsigned long long old_msr; - char msr_path[32]; - int retval; - int fd; + struct msr_hwp_request req; + struct msr_hwp_cap cap; + + int msr_offset = MSR_HWP_REQUEST; + + read_hwp_request(cpu, &req, msr_offset); + if (debug) + print_hwp_request(cpu, &req, "old: "); + + if (update_hwp_min) + req.hwp_min = req_update.hwp_min; + + if (update_hwp_max) + req.hwp_max = req_update.hwp_max; + + if (update_hwp_desired) + req.hwp_desired = req_update.hwp_desired; + + if (update_hwp_window) + req.hwp_window = req_update.hwp_window; + + if (update_hwp_epp) + req.hwp_epp = req_update.hwp_epp; + + req.hwp_use_pkg = req_update.hwp_use_pkg; + + read_hwp_cap(cpu, &cap, MSR_HWP_CAPABILITIES); + if (debug) + print_hwp_cap(cpu, &cap, ""); + + if (!force) + check_hwp_request_v_hwp_capabilities(cpu, &req, &cap); + + verify_hwp_req_self_consistency(cpu, &req); - sprintf(msr_path, "/dev/cpu/%d/msr", cpu); - fd = open(msr_path, O_RDWR); - if (fd < 0) { - perror(msr_path); - exit(1); + write_hwp_request(cpu, &req, msr_offset); + + if (debug) { + read_hwp_request(cpu, &req, msr_offset); + print_hwp_request(cpu, &req, "new: "); } + return 0; +} +int update_hwp_request_pkg(int pkg) +{ + struct msr_hwp_request req; + struct msr_hwp_cap cap; + int cpu = first_cpu_in_pkg[pkg]; + + int msr_offset = MSR_HWP_REQUEST_PKG; + + read_hwp_request(cpu, &req, msr_offset); + if (debug) + print_hwp_request_pkg(pkg, &req, "old: "); + + if (update_hwp_min) + req.hwp_min = req_update.hwp_min; + + if (update_hwp_max) + req.hwp_max = req_update.hwp_max; + + if (update_hwp_desired) + req.hwp_desired = req_update.hwp_desired; + + if (update_hwp_window) + req.hwp_window = req_update.hwp_window; + + if (update_hwp_epp) + req.hwp_epp = req_update.hwp_epp; + + read_hwp_cap(cpu, &cap, MSR_HWP_CAPABILITIES); + if (debug) + print_hwp_cap(cpu, &cap, ""); + + if (!force) + check_hwp_request_v_hwp_capabilities(cpu, &req, &cap); + + verify_hwp_req_self_consistency(cpu, &req); + + write_hwp_request(cpu, &req, msr_offset); - retval = pread(fd, &old_msr, sizeof old_msr, offset); - if (retval != sizeof old_msr) { - perror("pwrite"); - printf("pread cpu%d 0x%x = %d\n", cpu, offset, retval); - exit(-2); + if (debug) { + read_hwp_request(cpu, &req, msr_offset); + print_hwp_request_pkg(pkg, &req, "new: "); } + return 0; +} + +int enable_hwp_on_cpu(int cpu) +{ + unsigned long long msr; + + get_msr(cpu, MSR_PM_ENABLE, &msr); + put_msr(cpu, MSR_PM_ENABLE, 1); + + if (verbose) + printf("cpu%d: MSR_PM_ENABLE old: %d new: %d\n", cpu, (unsigned int) msr, 1); + + return 0; +} + +int update_cpu_msrs(int cpu) +{ + unsigned long long msr; + - retval = pwrite(fd, &new_msr, sizeof new_msr, offset); - if (retval != sizeof new_msr) { - perror("pwrite"); - printf("pwrite cpu%d 0x%x = %d\n", cpu, offset, retval); - exit(-2); + if (update_epb) { + get_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, &msr); + put_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, new_epb); + + if (verbose) + printf("cpu%d: ENERGY_PERF_BIAS old: %d new: %d\n", + cpu, (unsigned int) msr, (unsigned int) new_epb); } - close(fd); + if (update_turbo) { + int turbo_is_present_and_disabled; + + get_msr(cpu, MSR_IA32_MISC_ENABLE, &msr); + + turbo_is_present_and_disabled = ((msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE) != 0); + + if (turbo_update_value == 1) { + if (turbo_is_present_and_disabled) { + msr &= ~MSR_IA32_MISC_ENABLE_TURBO_DISABLE; + put_msr(cpu, MSR_IA32_MISC_ENABLE, msr); + if (verbose) + printf("cpu%d: turbo ENABLE\n", cpu); + } + } else { + /* + * if "turbo_is_enabled" were known to be describe this cpu + * then we could use it here to skip redundant disable requests. + * but cpu may be in a different package, so we always write. + */ + msr |= MSR_IA32_MISC_ENABLE_TURBO_DISABLE; + put_msr(cpu, MSR_IA32_MISC_ENABLE, msr); + if (verbose) + printf("cpu%d: turbo DISABLE\n", cpu); + } + } + + if (!has_hwp) + return 0; + + if (!hwp_update_enabled()) + return 0; + + update_hwp_request(cpu); + return 0; +} + +/* + * Open a file, and exit on failure + */ +FILE *fopen_or_die(const char *path, const char *mode) +{ + FILE *filep = fopen(path, "r"); - return old_msr; + if (!filep) + err(1, "%s: open failed", path); + return filep; } -void print_msr(int cpu) +unsigned int get_pkg_num(int cpu) { - printf("cpu%d: 0x%016llx\n", - cpu, get_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS)); + FILE *fp; + char pathname[128]; + unsigned int pkg; + int retval; + + sprintf(pathname, "/sys/devices/system/cpu/cpu%d/topology/physical_package_id", cpu); + + fp = fopen_or_die(pathname, "r"); + retval = fscanf(fp, "%d\n", &pkg); + if (retval != 1) + errx(1, "%s: failed to parse", pathname); + return pkg; } -void update_msr(int cpu) +int set_max_cpu_pkg_num(int cpu) { - unsigned long long previous_msr; + unsigned int pkg; - previous_msr = put_msr(cpu, new_bias, MSR_IA32_ENERGY_PERF_BIAS); + if (max_cpu_num < cpu) + max_cpu_num = cpu; - if (verbose) - printf("cpu%d msr0x%x 0x%016llx -> 0x%016llx\n", - cpu, MSR_IA32_ENERGY_PERF_BIAS, previous_msr, new_bias); + pkg = get_pkg_num(cpu); + + if (pkg >= MAX_PACKAGES) + errx(1, "cpu%d: %d >= MAX_PACKAGES (%d)", cpu, pkg, MAX_PACKAGES); + + if (pkg > max_pkg_num) + max_pkg_num = pkg; - return; + if ((pkg_present_set & (1ULL << pkg)) == 0) { + pkg_present_set |= (1ULL << pkg); + first_cpu_in_pkg[pkg] = cpu; + } + + return 0; +} +int mark_cpu_present(int cpu) +{ + CPU_SET_S(cpu, cpu_setsize, cpu_present_set); + return 0; } -char *proc_stat = "/proc/stat"; /* - * run func() on every cpu in /dev/cpu + * run func(cpu) on every cpu in /proc/stat + * return max_cpu number */ -void for_every_cpu(void (func)(int)) +int for_all_proc_cpus(int (func)(int)) { FILE *fp; + int cpu_num; int retval; - fp = fopen(proc_stat, "r"); - if (fp == NULL) { - perror(proc_stat); - exit(1); - } + fp = fopen_or_die(proc_stat, "r"); retval = fscanf(fp, "cpu %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n"); - if (retval != 0) { - perror("/proc/stat format"); - exit(1); - } + if (retval != 0) + err(1, "%s: failed to parse format", proc_stat); while (1) { - int cpu; - - retval = fscanf(fp, - "cpu%u %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n", - &cpu); + retval = fscanf(fp, "cpu%u %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n", &cpu_num); if (retval != 1) break; - func(cpu); + retval = func(cpu_num); + if (retval) { + fclose(fp); + return retval; + } } fclose(fp); + return 0; +} + +void for_all_cpus_in_set(size_t set_size, cpu_set_t *cpu_set, int (func)(int)) +{ + int cpu_num; + + for (cpu_num = 0; cpu_num <= max_cpu_num; ++cpu_num) + if (CPU_ISSET_S(cpu_num, set_size, cpu_set)) + func(cpu_num); +} + +void init_data_structures(void) +{ + for_all_proc_cpus(set_max_cpu_pkg_num); + + cpu_setsize = CPU_ALLOC_SIZE((max_cpu_num + 1)); + + cpu_present_set = CPU_ALLOC((max_cpu_num + 1)); + if (cpu_present_set == NULL) + err(3, "CPU_ALLOC"); + CPU_ZERO_S(cpu_setsize, cpu_present_set); + for_all_proc_cpus(mark_cpu_present); +} + +/* clear has_hwp if it is not enable (or being enabled) */ + +void verify_hwp_is_enabled(void) +{ + unsigned long long msr; + + if (!has_hwp) /* set in early_cpuid() */ + return; + + /* MSR_PM_ENABLE[1] == 1 if HWP is enabled and MSRs visible */ + get_msr(base_cpu, MSR_PM_ENABLE, &msr); + if ((msr & 1) == 0) { + fprintf(stderr, "HWP can be enabled using '--hwp-enable'\n"); + has_hwp = 0; + return; + } +} + +int req_update_bounds_check(void) +{ + if (!hwp_update_enabled()) + return 0; + + /* fail if min > max requested */ + if ((update_hwp_max && update_hwp_min) && + (req_update.hwp_min > req_update.hwp_max)) { + printf("hwp-min %d > hwp_max %d\n", req_update.hwp_min, req_update.hwp_max); + return -EINVAL; + } + + /* fail if desired > max requestd */ + if (req_update.hwp_desired && update_hwp_max && + (req_update.hwp_desired > req_update.hwp_max)) { + printf("hwp-desired cannot be greater than hwp_max\n"); + return -EINVAL; + } + /* fail if desired < min requestd */ + if (req_update.hwp_desired && update_hwp_min && + (req_update.hwp_desired < req_update.hwp_min)) { + printf("hwp-desired cannot be less than hwp_min\n"); + return -EINVAL; + } + + return 0; +} + +void set_base_cpu(void) +{ + base_cpu = sched_getcpu(); + if (base_cpu < 0) + err(-ENODEV, "No valid cpus found"); +} + + +void probe_dev_msr(void) +{ + struct stat sb; + char pathname[32]; + + sprintf(pathname, "/dev/cpu/%d/msr", base_cpu); + if (stat(pathname, &sb)) + if (system("/sbin/modprobe msr > /dev/null 2>&1")) + err(-5, "no /dev/cpu/0/msr, Try \"# modprobe msr\" "); +} +/* + * early_cpuid() + * initialize turbo_is_enabled, has_hwp, has_epb + * before cmdline is parsed + */ +void early_cpuid(void) +{ + unsigned int eax, ebx, ecx, edx, max_level; + unsigned int fms, family, model; + + __get_cpuid(0, &max_level, &ebx, &ecx, &edx); + + if (max_level < 6) + errx(1, "Processor not supported\n"); + + __get_cpuid(1, &fms, &ebx, &ecx, &edx); + family = (fms >> 8) & 0xf; + model = (fms >> 4) & 0xf; + if (family == 6 || family == 0xf) + model += ((fms >> 16) & 0xf) << 4; + + if (model == 0x4F) { + unsigned long long msr; + + get_msr(base_cpu, MSR_TURBO_RATIO_LIMIT, &msr); + + bdx_highest_ratio = msr & 0xFF; + } + + __get_cpuid(0x6, &eax, &ebx, &ecx, &edx); + turbo_is_enabled = (eax >> 1) & 1; + has_hwp = (eax >> 7) & 1; + has_epb = (ecx >> 3) & 1; +} + +/* + * parse_cpuid() + * set + * has_hwp, has_hwp_notify, has_hwp_activity_window, has_hwp_epp, has_hwp_request_pkg, has_epb + */ +void parse_cpuid(void) +{ + unsigned int eax, ebx, ecx, edx, max_level; + unsigned int fms, family, model, stepping; + + eax = ebx = ecx = edx = 0; + + __get_cpuid(0, &max_level, &ebx, &ecx, &edx); + + if (ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e) + genuine_intel = 1; + + if (debug) + fprintf(stderr, "CPUID(0): %.4s%.4s%.4s ", + (char *)&ebx, (char *)&edx, (char *)&ecx); + + __get_cpuid(1, &fms, &ebx, &ecx, &edx); + family = (fms >> 8) & 0xf; + model = (fms >> 4) & 0xf; + stepping = fms & 0xf; + if (family == 6 || family == 0xf) + model += ((fms >> 16) & 0xf) << 4; + + if (debug) { + fprintf(stderr, "%d CPUID levels; family:model:stepping 0x%x:%x:%x (%d:%d:%d)\n", + max_level, family, model, stepping, family, model, stepping); + fprintf(stderr, "CPUID(1): %s %s %s %s %s %s %s %s\n", + ecx & (1 << 0) ? "SSE3" : "-", + ecx & (1 << 3) ? "MONITOR" : "-", + ecx & (1 << 7) ? "EIST" : "-", + ecx & (1 << 8) ? "TM2" : "-", + edx & (1 << 4) ? "TSC" : "-", + edx & (1 << 5) ? "MSR" : "-", + edx & (1 << 22) ? "ACPI-TM" : "-", + edx & (1 << 29) ? "TM" : "-"); + } + + if (!(edx & (1 << 5))) + errx(1, "CPUID: no MSR"); + + + __get_cpuid(0x6, &eax, &ebx, &ecx, &edx); + /* turbo_is_enabled already set */ + /* has_hwp already set */ + has_hwp_notify = eax & (1 << 8); + has_hwp_activity_window = eax & (1 << 9); + has_hwp_epp = eax & (1 << 10); + has_hwp_request_pkg = eax & (1 << 11); + + if (!has_hwp_request_pkg && update_hwp_use_pkg) + errx(1, "--hwp-use-pkg is not available on this hardware"); + + /* has_epb already set */ + + if (debug) + fprintf(stderr, + "CPUID(6): %sTURBO, %sHWP, %sHWPnotify, %sHWPwindow, %sHWPepp, %sHWPpkg, %sEPB\n", + turbo_is_enabled ? "" : "No-", + has_hwp ? "" : "No-", + has_hwp_notify ? "" : "No-", + has_hwp_activity_window ? "" : "No-", + has_hwp_epp ? "" : "No-", + has_hwp_request_pkg ? "" : "No-", + has_epb ? "" : "No-"); + + return; /* success */ } int main(int argc, char **argv) { + set_base_cpu(); + probe_dev_msr(); + init_data_structures(); + + early_cpuid(); /* initial cpuid parse before cmdline */ + cmdline(argc, argv); - if (verbose > 1) - printf("x86_energy_perf_policy Nov 24, 2010" - " - Len Brown <lenb@kernel.org>\n"); - if (verbose > 1 && !read_only) - printf("new_bias %lld\n", new_bias); - - validate_cpuid(); - - if (cpu != -1) { - if (read_only) - print_msr(cpu); - else - update_msr(cpu); - } else { - if (read_only) - for_every_cpu(print_msr); - else - for_every_cpu(update_msr); + if (debug) + print_version(); + + parse_cpuid(); + + /* If CPU-set and PKG-set are not initialized, default to all CPUs */ + if ((cpu_selected_set == 0) && (pkg_selected_set == 0)) + cpu_selected_set = cpu_present_set; + + /* + * If HWP is being enabled, do it now, so that subsequent operations + * that access HWP registers can work. + */ + if (update_hwp_enable) + for_all_cpus_in_set(cpu_setsize, cpu_selected_set, enable_hwp_on_cpu); + + /* If HWP present, but disabled, warn and ignore from here forward */ + verify_hwp_is_enabled(); + + if (req_update_bounds_check()) + return -EINVAL; + + /* display information only, no updates to settings */ + if (!update_epb && !update_turbo && !hwp_update_enabled()) { + if (cpu_selected_set) + for_all_cpus_in_set(cpu_setsize, cpu_selected_set, print_cpu_msrs); + + if (has_hwp_request_pkg) { + if (pkg_selected_set == 0) + pkg_selected_set = pkg_present_set; + + for_packages(pkg_selected_set, print_pkg_msrs); + } + + return 0; } + /* update CPU set */ + if (cpu_selected_set) { + for_all_cpus_in_set(cpu_setsize, cpu_selected_set, update_sysfs); + for_all_cpus_in_set(cpu_setsize, cpu_selected_set, update_cpu_msrs); + } else if (pkg_selected_set) + for_packages(pkg_selected_set, update_hwp_request_pkg); + return 0; } |
