github.com/bugraaydogar/snapd@v0.0.0-20210315170335-8c70bb858939/interfaces/builtin/cpu_control.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2018 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package builtin
    21  
    22  const cpuControlSummary = `allows setting CPU tunables`
    23  
    24  const cpuControlBaseDeclarationSlots = `
    25    cpu-control:
    26      allow-installation:
    27        slot-snap-type:
    28          - core
    29      deny-auto-connection: true
    30  `
    31  
    32  const cpuControlConnectedPlugAppArmor = `
    33  # Description: This interface allows for setting CPU tunables
    34  /sys/devices/system/cpu/**/ r,
    35  /sys/devices/system/cpu/cpu*/online rw,
    36  /sys/devices/system/cpu/smt/*       r,
    37  /sys/devices/system/cpu/smt/control w,
    38  
    39  # https://www.kernel.org/doc/html/latest/admin-guide/pm/cpufreq.html#policy-interface-in-sysfs
    40  /sys/devices/system/cpu/cpufreq/{,**} r,
    41  /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference w,
    42  /sys/devices/system/cpu/cpufreq/policy*/scaling_governor w,
    43  /sys/devices/system/cpu/cpufreq/policy*/scaling_max_freq w,
    44  /sys/devices/system/cpu/cpufreq/policy*/scaling_min_freq w,
    45  /sys/devices/system/cpu/cpufreq/policy*/scaling_setspeed w,
    46  /sys/devices/system/cpu/cpufreq/boost w,
    47  
    48  # https://www.kernel.org/doc/html/latest/admin-guide/pm/intel_pstate.html#user-space-interface-in-sysfs
    49  /sys/devices/system/cpu/intel_pstate/{,*} r,
    50  /sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost w,
    51  /sys/devices/system/cpu/intel_pstate/max_perf_pct w,
    52  /sys/devices/system/cpu/intel_pstate/min_perf_pct w,
    53  /sys/devices/system/cpu/intel_pstate/no_turbo w,
    54  /sys/devices/system/cpu/intel_pstate/status w,
    55  `
    56  
    57  func init() {
    58  	registerIface(&commonInterface{
    59  		name:                  "cpu-control",
    60  		summary:               cpuControlSummary,
    61  		implicitOnCore:        true,
    62  		implicitOnClassic:     true,
    63  		baseDeclarationSlots:  cpuControlBaseDeclarationSlots,
    64  		connectedPlugAppArmor: cpuControlConnectedPlugAppArmor,
    65  	})
    66  }