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import errno from . import hotplug from .decorators import * import tuned.logs import tuned.consts as consts from tuned.utils.commands import commands import os import re log = tuned.logs.get() class SCSIHostPlugin(hotplug.Plugin): """ Tunes options for SCSI hosts. The plug-in sets Aggressive Link Power Management (ALPM) to the value specified by the [option]`alpm` option. The option takes one of four values: `min_power`, `med_power_with_dipm`, `medium_power` and `max_performance`. NOTE: ALPM is only available on SATA controllers that use the Advanced Host Controller Interface (AHCI). .ALPM setting when extended periods of idle time are expected ==== ---- [scsi_host] alpm=med_power_with_dipm ---- ==== """ def __init__(self, *args, **kwargs): super(SCSIHostPlugin, self).__init__(*args, **kwargs) self._cmd = commands() def _init_devices(self): super(SCSIHostPlugin, self)._init_devices() self._devices_supported = True self._free_devices = set() for device in self._hardware_inventory.get_devices("scsi"): if self._device_is_supported(device): self._free_devices.add(device.sys_name) self._assigned_devices = set() def _get_device_objects(self, devices): return [self._hardware_inventory.get_device("scsi", x) for x in devices] @classmethod def _device_is_supported(cls, device): return device.device_type == "scsi_host" def _hardware_events_init(self): self._hardware_inventory.subscribe(self, "scsi", self._hardware_events_callback) def _hardware_events_cleanup(self): self._hardware_inventory.unsubscribe(self) def _hardware_events_callback(self, event, device): if self._device_is_supported(device): super(SCSIHostPlugin, self)._hardware_events_callback(event, device) def _added_device_apply_tuning(self, instance, device_name): super(SCSIHostPlugin, self)._added_device_apply_tuning(instance, device_name) def _removed_device_unapply_tuning(self, instance, device_name): super(SCSIHostPlugin, self)._removed_device_unapply_tuning(instance, device_name) @classmethod def _get_config_options(cls): return { "alpm" : None, } def _instance_init(self, instance): instance._has_static_tuning = True instance._has_dynamic_tuning = False def _instance_cleanup(self, instance): pass def _get_alpm_policy_file(self, device): return os.path.join("/sys/class/scsi_host/", str(device), "link_power_management_policy") def _get_ahci_port_cmd_file(self, device): return os.path.join("/sys/class/scsi_host/", str(device), "ahci_port_cmd") def _is_external_sata_port(self, device): port_cmd_file = self._get_ahci_port_cmd_file(device) if not os.path.isfile(port_cmd_file): return False port_cmd = int(self._cmd.read_file(port_cmd_file), 16) # Bit 18 is HPCP (Hot Plug Capable Port) # Bit 21 is ESP (External SATA Port) return port_cmd & (1 << 18 | 1 << 21) != 0 @command_set("alpm", per_device = True) def _set_alpm(self, policy, device, instance, sim, remove): if policy is None: return None if self._is_external_sata_port(device): # According to the SATA AHCI specification, external (or hot-plug capable) # SATA ports must have power management disabled to reliably detect hot plug removal. log.info("Device '%s' is an external SATA controller, skipping ALPM setting to support hot plug" % str(device)) return None policy_file = self._get_alpm_policy_file(device) if not sim: if os.path.exists(policy_file): self._cmd.write_to_file(policy_file, policy, \ no_error = [errno.ENOENT] if remove else False) else: log.info("ALPM control file ('%s') not found, skipping ALPM setting for '%s'" % (policy_file, str(device))) return None return policy @command_get("alpm") def _get_alpm(self, device, instance, ignore_missing=False): policy_file = self._get_alpm_policy_file(device) policy = self._cmd.read_file(policy_file, no_error = True).strip() return policy if policy != "" else None