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![Linus Torvalds](/assets/img/avatar_default.png)
- Fix for a recent PCI power management change that overlooked the fact that some IRQ chips might not be able to configure PCIe PME for system wakeup from Lucas Stach. - Fix for a bug introduced in 3.17 where acpi_device_wakeup() is called with a wrong ordering of arguments from Zhang Rui. - A bunch of intel_pstate driver fixes (all -stable candidates) from Dirk Brandewie, Gabriele Mazzotta and Pali Rohár. - Fixes for a rather long-standing problem with the OOM killer and the freezer that frozen processes killed by the OOM do not actually release any memory until they are thawed, so OOM-killing them is rather pointless, with a couple of cleanups on top (Michal Hocko, Cong Wang, Rafael J Wysocki). - ACPICA update to upstream release 20140926, inlcuding mostly cleanups reducing differences between the upstream ACPICA and the kernel code, tools changes (acpidump, acpiexec) and support for the _DDN object (Bob Moore, Lv Zheng). - New PM QoS class for memory bandwidth from Tomeu Vizoso. - Default 32-bit DMA mask for platform devices enumerated by ACPI (this change is mostly needed for some drivers development in progress targeted at 3.19) from Heikki Krogerus. - ACPI EC driver cleanups, mostly related to debugging, from Lv Zheng. - cpufreq-dt driver updates from Thomas Petazzoni. - powernv cpuidle driver update from Preeti U Murthy. / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJUSjZFAAoJEILEb/54YlRxyfIP/irc/f7DDb0mElF755ANtSXp CTVIQSn6uZ2P//ElQO0+nckZSo39jrBkHVu11vDxmVt2PJE2VBgNjHJLyf1boaPI 9aR5kzVmL6jzJ9wA3gYqr91uCVegY1KDFx2KrAlrNomrlc2xtTGf6F17I4tI9qHL pgc8jhJZ1swn4wL0qnqffLsmx3Hoq3uIO5PNAXD+qUSgm5+8zZwLLlvnrM8upOO4 cHTvxh+ZwXrak4RO4NciYZPKJQAD47MTcJCDR/bg7MKxeiJPrzLrR+WrbCYr5md1 iSiVThZDZnnYTiDLPiemcXoe3jpG2bigXncxJVRDJ7MBOO7ZX7mppwdNnMaNM5kN 92kvLOy269NSS2SFJ0N/B6Xr1jQ0HEdwj7erl4xJIkobKRuvN9fYyVWkoL9i3sj4 OQ7fqhXoEON9CW0KwC5FRAswIungB//o5OjN7VlNKTBKfPdWAjgVQOyeeZ+gSoQo 9tbR/QEEEcHn8fiQpBM9cQw2NL0Rx1ZzHXs7dB0U6ynfG5Drge4OTTwl/Gm4mavB 8Tv3ji26VvQdFr+It2SsijjjjjzVIsdK5iUpSHYo876u4l20CEH3gSpVA/jNhgH6 HaAN5DYIot4Qq5ifjDydRT6WGIyxsVMk3SqehjF47TDaX4l1FbSYWGVyKxfjnQs3 2rWJ3yuDjH28Cfmi0MO0 =4Q8f -----END PGP SIGNATURE----- Merge tag 'pm+acpi-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI and power management updates from Rafael Wysocki: "This is material that didn't make it to my 3.18-rc1 pull request for various reasons, mostly related to timing and travel (LinuxCon EU / LPC) plus a couple of fixes for recent bugs. The only really new thing here is the PM QoS class for memory bandwidth, but it is simple enough and users of it will be added in the next cycle. One major change in behavior is that platform devices enumerated by ACPI will use 32-bit DMA mask by default. Also included is an ACPICA update to a new upstream release, but that's mostly cleanups, changes in tools and similar. The rest is fixes and cleanups mostly. Specifics: - Fix for a recent PCI power management change that overlooked the fact that some IRQ chips might not be able to configure PCIe PME for system wakeup from Lucas Stach. - Fix for a bug introduced in 3.17 where acpi_device_wakeup() is called with a wrong ordering of arguments from Zhang Rui. - A bunch of intel_pstate driver fixes (all -stable candidates) from Dirk Brandewie, Gabriele Mazzotta and Pali Rohár. - Fixes for a rather long-standing problem with the OOM killer and the freezer that frozen processes killed by the OOM do not actually release any memory until they are thawed, so OOM-killing them is rather pointless, with a couple of cleanups on top (Michal Hocko, Cong Wang, Rafael J Wysocki). - ACPICA update to upstream release 20140926, inlcuding mostly cleanups reducing differences between the upstream ACPICA and the kernel code, tools changes (acpidump, acpiexec) and support for the _DDN object (Bob Moore, Lv Zheng). - New PM QoS class for memory bandwidth from Tomeu Vizoso. - Default 32-bit DMA mask for platform devices enumerated by ACPI (this change is mostly needed for some drivers development in progress targeted at 3.19) from Heikki Krogerus. - ACPI EC driver cleanups, mostly related to debugging, from Lv Zheng. - cpufreq-dt driver updates from Thomas Petazzoni. - powernv cpuidle driver update from Preeti U Murthy" * tag 'pm+acpi-3.18-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (34 commits) intel_pstate: Correct BYT VID values. intel_pstate: Fix BYT frequency reporting intel_pstate: Don't lose sysfs settings during cpu offline cpufreq: intel_pstate: Reflect current no_turbo state correctly cpufreq: expose scaling_cur_freq sysfs file for set_policy() drivers cpufreq: intel_pstate: Fix setting max_perf_pct in performance policy PCI / PM: handle failure to enable wakeup on PCIe PME ACPI: invoke acpi_device_wakeup() with correct parameters PM / freezer: Clean up code after recent fixes PM: convert do_each_thread to for_each_process_thread OOM, PM: OOM killed task shouldn't escape PM suspend freezer: remove obsolete comments in __thaw_task() freezer: Do not freeze tasks killed by OOM killer ACPI / platform: provide default DMA mask cpuidle: powernv: Populate cpuidle state details by querying the device-tree cpufreq: cpufreq-dt: adjust message related to regulators cpufreq: cpufreq-dt: extend with platform_data cpufreq: allow driver-specific data ACPI / EC: Cleanup coding style. ACPI / EC: Refine event/query debugging messages. ...
1115 lines
31 KiB
C
1115 lines
31 KiB
C
/*
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* drivers/acpi/device_pm.c - ACPI device power management routines.
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*
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* Copyright (C) 2012, Intel Corp.
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/acpi.h>
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#include <linux/export.h>
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#include <linux/mutex.h>
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#include <linux/pm_qos.h>
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#include <linux/pm_runtime.h>
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#include "internal.h"
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#define _COMPONENT ACPI_POWER_COMPONENT
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ACPI_MODULE_NAME("device_pm");
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/**
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* acpi_power_state_string - String representation of ACPI device power state.
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* @state: ACPI device power state to return the string representation of.
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*/
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const char *acpi_power_state_string(int state)
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{
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switch (state) {
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case ACPI_STATE_D0:
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return "D0";
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case ACPI_STATE_D1:
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return "D1";
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case ACPI_STATE_D2:
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return "D2";
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case ACPI_STATE_D3_HOT:
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return "D3hot";
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case ACPI_STATE_D3_COLD:
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return "D3cold";
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default:
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return "(unknown)";
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}
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}
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/**
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* acpi_device_get_power - Get power state of an ACPI device.
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* @device: Device to get the power state of.
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* @state: Place to store the power state of the device.
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*
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* This function does not update the device's power.state field, but it may
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* update its parent's power.state field (when the parent's power state is
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* unknown and the device's power state turns out to be D0).
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*/
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int acpi_device_get_power(struct acpi_device *device, int *state)
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{
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int result = ACPI_STATE_UNKNOWN;
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if (!device || !state)
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return -EINVAL;
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if (!device->flags.power_manageable) {
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/* TBD: Non-recursive algorithm for walking up hierarchy. */
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*state = device->parent ?
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device->parent->power.state : ACPI_STATE_D0;
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goto out;
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}
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/*
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* Get the device's power state from power resources settings and _PSC,
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* if available.
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*/
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if (device->power.flags.power_resources) {
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int error = acpi_power_get_inferred_state(device, &result);
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if (error)
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return error;
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}
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if (device->power.flags.explicit_get) {
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acpi_handle handle = device->handle;
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unsigned long long psc;
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acpi_status status;
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status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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/*
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* The power resources settings may indicate a power state
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* shallower than the actual power state of the device.
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*
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* Moreover, on systems predating ACPI 4.0, if the device
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* doesn't depend on any power resources and _PSC returns 3,
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* that means "power off". We need to maintain compatibility
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* with those systems.
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*/
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if (psc > result && psc < ACPI_STATE_D3_COLD)
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result = psc;
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else if (result == ACPI_STATE_UNKNOWN)
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result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_COLD : psc;
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}
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/*
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* If we were unsure about the device parent's power state up to this
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* point, the fact that the device is in D0 implies that the parent has
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* to be in D0 too, except if ignore_parent is set.
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*/
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if (!device->power.flags.ignore_parent && device->parent
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&& device->parent->power.state == ACPI_STATE_UNKNOWN
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&& result == ACPI_STATE_D0)
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device->parent->power.state = ACPI_STATE_D0;
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*state = result;
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out:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
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device->pnp.bus_id, acpi_power_state_string(*state)));
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return 0;
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}
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static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state)
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{
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if (adev->power.states[state].flags.explicit_set) {
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char method[5] = { '_', 'P', 'S', '0' + state, '\0' };
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acpi_status status;
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status = acpi_evaluate_object(adev->handle, method, NULL, NULL);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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}
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return 0;
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}
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/**
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* acpi_device_set_power - Set power state of an ACPI device.
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* @device: Device to set the power state of.
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* @state: New power state to set.
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*
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* Callers must ensure that the device is power manageable before using this
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* function.
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*/
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int acpi_device_set_power(struct acpi_device *device, int state)
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{
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int result = 0;
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bool cut_power = false;
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if (!device || !device->flags.power_manageable
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|| (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
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return -EINVAL;
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/* Make sure this is a valid target state */
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if (state == device->power.state) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] already in %s\n",
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device->pnp.bus_id,
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acpi_power_state_string(state)));
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return 0;
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}
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if (!device->power.states[state].flags.valid) {
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dev_warn(&device->dev, "Power state %s not supported\n",
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acpi_power_state_string(state));
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return -ENODEV;
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}
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if (!device->power.flags.ignore_parent &&
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device->parent && (state < device->parent->power.state)) {
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dev_warn(&device->dev,
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"Cannot transition to power state %s for parent in %s\n",
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acpi_power_state_string(state),
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acpi_power_state_string(device->parent->power.state));
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return -ENODEV;
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}
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/* For D3cold we should first transition into D3hot. */
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if (state == ACPI_STATE_D3_COLD
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&& device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
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state = ACPI_STATE_D3_HOT;
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cut_power = true;
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}
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if (state < device->power.state && state != ACPI_STATE_D0
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&& device->power.state >= ACPI_STATE_D3_HOT) {
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dev_warn(&device->dev,
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"Cannot transition to non-D0 state from D3\n");
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return -ENODEV;
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}
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/*
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* Transition Power
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* ----------------
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* In accordance with the ACPI specification first apply power (via
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* power resources) and then evalute _PSx.
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*/
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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result = acpi_dev_pm_explicit_set(device, state);
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if (result)
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goto end;
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if (cut_power) {
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device->power.state = state;
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state = ACPI_STATE_D3_COLD;
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result = acpi_power_transition(device, state);
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}
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end:
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if (result) {
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dev_warn(&device->dev, "Failed to change power state to %s\n",
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acpi_power_state_string(state));
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} else {
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device->power.state = state;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Device [%s] transitioned to %s\n",
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device->pnp.bus_id,
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acpi_power_state_string(state)));
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}
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return result;
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}
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EXPORT_SYMBOL(acpi_device_set_power);
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int acpi_bus_set_power(acpi_handle handle, int state)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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if (result)
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return result;
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return acpi_device_set_power(device, state);
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}
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EXPORT_SYMBOL(acpi_bus_set_power);
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int acpi_bus_init_power(struct acpi_device *device)
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{
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int state;
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int result;
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if (!device)
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return -EINVAL;
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device->power.state = ACPI_STATE_UNKNOWN;
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if (!acpi_device_is_present(device))
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return 0;
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result = acpi_device_get_power(device, &state);
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if (result)
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return result;
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if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
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result = acpi_power_on_resources(device, state);
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if (result)
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return result;
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result = acpi_dev_pm_explicit_set(device, state);
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if (result)
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return result;
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} else if (state == ACPI_STATE_UNKNOWN) {
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/*
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* No power resources and missing _PSC? Cross fingers and make
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* it D0 in hope that this is what the BIOS put the device into.
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* [We tried to force D0 here by executing _PS0, but that broke
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* Toshiba P870-303 in a nasty way.]
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*/
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state = ACPI_STATE_D0;
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}
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device->power.state = state;
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return 0;
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}
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/**
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* acpi_device_fix_up_power - Force device with missing _PSC into D0.
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* @device: Device object whose power state is to be fixed up.
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*
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* Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
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* are assumed to be put into D0 by the BIOS. However, in some cases that may
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* not be the case and this function should be used then.
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*/
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int acpi_device_fix_up_power(struct acpi_device *device)
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{
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int ret = 0;
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if (!device->power.flags.power_resources
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&& !device->power.flags.explicit_get
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&& device->power.state == ACPI_STATE_D0)
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ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
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return ret;
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}
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int acpi_device_update_power(struct acpi_device *device, int *state_p)
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{
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int state;
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int result;
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if (device->power.state == ACPI_STATE_UNKNOWN) {
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result = acpi_bus_init_power(device);
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if (!result && state_p)
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*state_p = device->power.state;
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return result;
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}
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result = acpi_device_get_power(device, &state);
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if (result)
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return result;
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if (state == ACPI_STATE_UNKNOWN) {
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state = ACPI_STATE_D0;
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result = acpi_device_set_power(device, state);
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if (result)
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return result;
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} else {
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if (device->power.flags.power_resources) {
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/*
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* We don't need to really switch the state, bu we need
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* to update the power resources' reference counters.
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*/
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result = acpi_power_transition(device, state);
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if (result)
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return result;
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}
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device->power.state = state;
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}
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if (state_p)
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*state_p = state;
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_device_update_power);
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int acpi_bus_update_power(acpi_handle handle, int *state_p)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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return result ? result : acpi_device_update_power(device, state_p);
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}
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EXPORT_SYMBOL_GPL(acpi_bus_update_power);
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bool acpi_bus_power_manageable(acpi_handle handle)
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{
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struct acpi_device *device;
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int result;
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result = acpi_bus_get_device(handle, &device);
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return result ? false : device->flags.power_manageable;
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}
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EXPORT_SYMBOL(acpi_bus_power_manageable);
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#ifdef CONFIG_PM
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static DEFINE_MUTEX(acpi_pm_notifier_lock);
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static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
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{
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struct acpi_device *adev;
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if (val != ACPI_NOTIFY_DEVICE_WAKE)
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return;
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adev = acpi_bus_get_acpi_device(handle);
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if (!adev)
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return;
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mutex_lock(&acpi_pm_notifier_lock);
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if (adev->wakeup.flags.notifier_present) {
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__pm_wakeup_event(adev->wakeup.ws, 0);
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if (adev->wakeup.context.work.func)
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queue_pm_work(&adev->wakeup.context.work);
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}
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mutex_unlock(&acpi_pm_notifier_lock);
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acpi_bus_put_acpi_device(adev);
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}
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/**
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* acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
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* @adev: ACPI device to add the notify handler for.
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* @dev: Device to generate a wakeup event for while handling the notification.
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* @work_func: Work function to execute when handling the notification.
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*
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* NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
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* PM wakeup events. For example, wakeup events may be generated for bridges
|
|
* if one of the devices below the bridge is signaling wakeup, even if the
|
|
* bridge itself doesn't have a wakeup GPE associated with it.
|
|
*/
|
|
acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
|
|
void (*work_func)(struct work_struct *work))
|
|
{
|
|
acpi_status status = AE_ALREADY_EXISTS;
|
|
|
|
if (!dev && !work_func)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
mutex_lock(&acpi_pm_notifier_lock);
|
|
|
|
if (adev->wakeup.flags.notifier_present)
|
|
goto out;
|
|
|
|
adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev));
|
|
adev->wakeup.context.dev = dev;
|
|
if (work_func)
|
|
INIT_WORK(&adev->wakeup.context.work, work_func);
|
|
|
|
status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
|
|
acpi_pm_notify_handler, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
|
|
adev->wakeup.flags.notifier_present = true;
|
|
|
|
out:
|
|
mutex_unlock(&acpi_pm_notifier_lock);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
|
|
* @adev: ACPI device to remove the notifier from.
|
|
*/
|
|
acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
|
|
{
|
|
acpi_status status = AE_BAD_PARAMETER;
|
|
|
|
mutex_lock(&acpi_pm_notifier_lock);
|
|
|
|
if (!adev->wakeup.flags.notifier_present)
|
|
goto out;
|
|
|
|
status = acpi_remove_notify_handler(adev->handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
acpi_pm_notify_handler);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
|
|
if (adev->wakeup.context.work.func) {
|
|
cancel_work_sync(&adev->wakeup.context.work);
|
|
adev->wakeup.context.work.func = NULL;
|
|
}
|
|
adev->wakeup.context.dev = NULL;
|
|
wakeup_source_unregister(adev->wakeup.ws);
|
|
|
|
adev->wakeup.flags.notifier_present = false;
|
|
|
|
out:
|
|
mutex_unlock(&acpi_pm_notifier_lock);
|
|
return status;
|
|
}
|
|
|
|
bool acpi_bus_can_wakeup(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device;
|
|
int result;
|
|
|
|
result = acpi_bus_get_device(handle, &device);
|
|
return result ? false : device->wakeup.flags.valid;
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_can_wakeup);
|
|
|
|
/**
|
|
* acpi_dev_pm_get_state - Get preferred power state of ACPI device.
|
|
* @dev: Device whose preferred target power state to return.
|
|
* @adev: ACPI device node corresponding to @dev.
|
|
* @target_state: System state to match the resultant device state.
|
|
* @d_min_p: Location to store the highest power state available to the device.
|
|
* @d_max_p: Location to store the lowest power state available to the device.
|
|
*
|
|
* Find the lowest power (highest number) and highest power (lowest number) ACPI
|
|
* device power states that the device can be in while the system is in the
|
|
* state represented by @target_state. Store the integer numbers representing
|
|
* those stats in the memory locations pointed to by @d_max_p and @d_min_p,
|
|
* respectively.
|
|
*
|
|
* Callers must ensure that @dev and @adev are valid pointers and that @adev
|
|
* actually corresponds to @dev before using this function.
|
|
*
|
|
* Returns 0 on success or -ENODATA when one of the ACPI methods fails or
|
|
* returns a value that doesn't make sense. The memory locations pointed to by
|
|
* @d_max_p and @d_min_p are only modified on success.
|
|
*/
|
|
static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
|
|
u32 target_state, int *d_min_p, int *d_max_p)
|
|
{
|
|
char method[] = { '_', 'S', '0' + target_state, 'D', '\0' };
|
|
acpi_handle handle = adev->handle;
|
|
unsigned long long ret;
|
|
int d_min, d_max;
|
|
bool wakeup = false;
|
|
acpi_status status;
|
|
|
|
/*
|
|
* If the system state is S0, the lowest power state the device can be
|
|
* in is D3cold, unless the device has _S0W and is supposed to signal
|
|
* wakeup, in which case the return value of _S0W has to be used as the
|
|
* lowest power state available to the device.
|
|
*/
|
|
d_min = ACPI_STATE_D0;
|
|
d_max = ACPI_STATE_D3_COLD;
|
|
|
|
/*
|
|
* If present, _SxD methods return the minimum D-state (highest power
|
|
* state) we can use for the corresponding S-states. Otherwise, the
|
|
* minimum D-state is D0 (ACPI 3.x).
|
|
*/
|
|
if (target_state > ACPI_STATE_S0) {
|
|
/*
|
|
* We rely on acpi_evaluate_integer() not clobbering the integer
|
|
* provided if AE_NOT_FOUND is returned.
|
|
*/
|
|
ret = d_min;
|
|
status = acpi_evaluate_integer(handle, method, NULL, &ret);
|
|
if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND)
|
|
|| ret > ACPI_STATE_D3_COLD)
|
|
return -ENODATA;
|
|
|
|
/*
|
|
* We need to handle legacy systems where D3hot and D3cold are
|
|
* the same and 3 is returned in both cases, so fall back to
|
|
* D3cold if D3hot is not a valid state.
|
|
*/
|
|
if (!adev->power.states[ret].flags.valid) {
|
|
if (ret == ACPI_STATE_D3_HOT)
|
|
ret = ACPI_STATE_D3_COLD;
|
|
else
|
|
return -ENODATA;
|
|
}
|
|
d_min = ret;
|
|
wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
|
|
&& adev->wakeup.sleep_state >= target_state;
|
|
} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
|
|
PM_QOS_FLAGS_NONE) {
|
|
wakeup = adev->wakeup.flags.valid;
|
|
}
|
|
|
|
/*
|
|
* If _PRW says we can wake up the system from the target sleep state,
|
|
* the D-state returned by _SxD is sufficient for that (we assume a
|
|
* wakeup-aware driver if wake is set). Still, if _SxW exists
|
|
* (ACPI 3.x), it should return the maximum (lowest power) D-state that
|
|
* can wake the system. _S0W may be valid, too.
|
|
*/
|
|
if (wakeup) {
|
|
method[3] = 'W';
|
|
status = acpi_evaluate_integer(handle, method, NULL, &ret);
|
|
if (status == AE_NOT_FOUND) {
|
|
if (target_state > ACPI_STATE_S0)
|
|
d_max = d_min;
|
|
} else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) {
|
|
/* Fall back to D3cold if ret is not a valid state. */
|
|
if (!adev->power.states[ret].flags.valid)
|
|
ret = ACPI_STATE_D3_COLD;
|
|
|
|
d_max = ret > d_min ? ret : d_min;
|
|
} else {
|
|
return -ENODATA;
|
|
}
|
|
}
|
|
|
|
if (d_min_p)
|
|
*d_min_p = d_min;
|
|
|
|
if (d_max_p)
|
|
*d_max_p = d_max;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
|
|
* @dev: Device whose preferred target power state to return.
|
|
* @d_min_p: Location to store the upper limit of the allowed states range.
|
|
* @d_max_in: Deepest low-power state to take into consideration.
|
|
* Return value: Preferred power state of the device on success, -ENODEV
|
|
* if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
|
|
* incorrect, or -ENODATA on ACPI method failure.
|
|
*
|
|
* The caller must ensure that @dev is valid before using this function.
|
|
*/
|
|
int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
|
|
{
|
|
struct acpi_device *adev;
|
|
int ret, d_min, d_max;
|
|
|
|
if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD)
|
|
return -EINVAL;
|
|
|
|
if (d_max_in > ACPI_STATE_D3_HOT) {
|
|
enum pm_qos_flags_status stat;
|
|
|
|
stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
|
|
if (stat == PM_QOS_FLAGS_ALL)
|
|
d_max_in = ACPI_STATE_D3_HOT;
|
|
}
|
|
|
|
adev = ACPI_COMPANION(dev);
|
|
if (!adev) {
|
|
dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(),
|
|
&d_min, &d_max);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (d_max_in < d_min)
|
|
return -EINVAL;
|
|
|
|
if (d_max > d_max_in) {
|
|
for (d_max = d_max_in; d_max > d_min; d_max--) {
|
|
if (adev->power.states[d_max].flags.valid)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (d_min_p)
|
|
*d_min_p = d_min;
|
|
|
|
return d_max;
|
|
}
|
|
EXPORT_SYMBOL(acpi_pm_device_sleep_state);
|
|
|
|
/**
|
|
* acpi_pm_notify_work_func - ACPI devices wakeup notification work function.
|
|
* @work: Work item to handle.
|
|
*/
|
|
static void acpi_pm_notify_work_func(struct work_struct *work)
|
|
{
|
|
struct device *dev;
|
|
|
|
dev = container_of(work, struct acpi_device_wakeup_context, work)->dev;
|
|
if (dev) {
|
|
pm_wakeup_event(dev, 0);
|
|
pm_runtime_resume(dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_device_wakeup - Enable/disable wakeup functionality for device.
|
|
* @adev: ACPI device to enable/disable wakeup functionality for.
|
|
* @target_state: State the system is transitioning into.
|
|
* @enable: Whether to enable or disable the wakeup functionality.
|
|
*
|
|
* Enable/disable the GPE associated with @adev so that it can generate
|
|
* wakeup signals for the device in response to external (remote) events and
|
|
* enable/disable device wakeup power.
|
|
*
|
|
* Callers must ensure that @adev is a valid ACPI device node before executing
|
|
* this function.
|
|
*/
|
|
static int acpi_device_wakeup(struct acpi_device *adev, u32 target_state,
|
|
bool enable)
|
|
{
|
|
struct acpi_device_wakeup *wakeup = &adev->wakeup;
|
|
|
|
if (enable) {
|
|
acpi_status res;
|
|
int error;
|
|
|
|
error = acpi_enable_wakeup_device_power(adev, target_state);
|
|
if (error)
|
|
return error;
|
|
|
|
res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
|
|
if (ACPI_FAILURE(res)) {
|
|
acpi_disable_wakeup_device_power(adev);
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
|
|
acpi_disable_wakeup_device_power(adev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
/**
|
|
* acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
|
|
* @dev: Device to enable/disable the platform to wake up.
|
|
* @enable: Whether to enable or disable the wakeup functionality.
|
|
*/
|
|
int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
|
|
{
|
|
struct acpi_device *adev;
|
|
|
|
if (!device_run_wake(phys_dev))
|
|
return -EINVAL;
|
|
|
|
adev = ACPI_COMPANION(phys_dev);
|
|
if (!adev) {
|
|
dev_dbg(phys_dev, "ACPI companion missing in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return acpi_device_wakeup(adev, ACPI_STATE_S0, enable);
|
|
}
|
|
EXPORT_SYMBOL(acpi_pm_device_run_wake);
|
|
#endif /* CONFIG_PM_RUNTIME */
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
|
|
* @dev: Device to enable/desible to wake up the system from sleep states.
|
|
* @enable: Whether to enable or disable @dev to wake up the system.
|
|
*/
|
|
int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
|
|
{
|
|
struct acpi_device *adev;
|
|
int error;
|
|
|
|
if (!device_can_wakeup(dev))
|
|
return -EINVAL;
|
|
|
|
adev = ACPI_COMPANION(dev);
|
|
if (!adev) {
|
|
dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
error = acpi_device_wakeup(adev, acpi_target_system_state(), enable);
|
|
if (!error)
|
|
dev_info(dev, "System wakeup %s by ACPI\n",
|
|
enable ? "enabled" : "disabled");
|
|
|
|
return error;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
/**
|
|
* acpi_dev_pm_low_power - Put ACPI device into a low-power state.
|
|
* @dev: Device to put into a low-power state.
|
|
* @adev: ACPI device node corresponding to @dev.
|
|
* @system_state: System state to choose the device state for.
|
|
*/
|
|
static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
|
|
u32 system_state)
|
|
{
|
|
int ret, state;
|
|
|
|
if (!acpi_device_power_manageable(adev))
|
|
return 0;
|
|
|
|
ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state);
|
|
return ret ? ret : acpi_device_set_power(adev, state);
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_pm_full_power - Put ACPI device into the full-power state.
|
|
* @adev: ACPI device node to put into the full-power state.
|
|
*/
|
|
static int acpi_dev_pm_full_power(struct acpi_device *adev)
|
|
{
|
|
return acpi_device_power_manageable(adev) ?
|
|
acpi_device_set_power(adev, ACPI_STATE_D0) : 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
/**
|
|
* acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
|
|
* @dev: Device to put into a low-power state.
|
|
*
|
|
* Put the given device into a runtime low-power state using the standard ACPI
|
|
* mechanism. Set up remote wakeup if desired, choose the state to put the
|
|
* device into (this checks if remote wakeup is expected to work too), and set
|
|
* the power state of the device.
|
|
*/
|
|
int acpi_dev_runtime_suspend(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
bool remote_wakeup;
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) >
|
|
PM_QOS_FLAGS_NONE;
|
|
error = acpi_device_wakeup(adev, ACPI_STATE_S0, remote_wakeup);
|
|
if (remote_wakeup && error)
|
|
return -EAGAIN;
|
|
|
|
error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
if (error)
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend);
|
|
|
|
/**
|
|
* acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
|
|
* @dev: Device to put into the full-power state.
|
|
*
|
|
* Put the given device into the full-power state using the standard ACPI
|
|
* mechanism at run time. Set the power state of the device to ACPI D0 and
|
|
* disable remote wakeup.
|
|
*/
|
|
int acpi_dev_runtime_resume(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
error = acpi_dev_pm_full_power(adev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume);
|
|
|
|
/**
|
|
* acpi_subsys_runtime_suspend - Suspend device using ACPI.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out the generic runtime suspend procedure for @dev and use ACPI to put
|
|
* it into a runtime low-power state.
|
|
*/
|
|
int acpi_subsys_runtime_suspend(struct device *dev)
|
|
{
|
|
int ret = pm_generic_runtime_suspend(dev);
|
|
return ret ? ret : acpi_dev_runtime_suspend(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);
|
|
|
|
/**
|
|
* acpi_subsys_runtime_resume - Resume device using ACPI.
|
|
* @dev: Device to Resume.
|
|
*
|
|
* Use ACPI to put the given device into the full-power state and carry out the
|
|
* generic runtime resume procedure for it.
|
|
*/
|
|
int acpi_subsys_runtime_resume(struct device *dev)
|
|
{
|
|
int ret = acpi_dev_runtime_resume(dev);
|
|
return ret ? ret : pm_generic_runtime_resume(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
|
|
#endif /* CONFIG_PM_RUNTIME */
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/**
|
|
* acpi_dev_suspend_late - Put device into a low-power state using ACPI.
|
|
* @dev: Device to put into a low-power state.
|
|
*
|
|
* Put the given device into a low-power state during system transition to a
|
|
* sleep state using the standard ACPI mechanism. Set up system wakeup if
|
|
* desired, choose the state to put the device into (this checks if system
|
|
* wakeup is expected to work too), and set the power state of the device.
|
|
*/
|
|
int acpi_dev_suspend_late(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
u32 target_state;
|
|
bool wakeup;
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
target_state = acpi_target_system_state();
|
|
wakeup = device_may_wakeup(dev);
|
|
error = acpi_device_wakeup(adev, target_state, wakeup);
|
|
if (wakeup && error)
|
|
return error;
|
|
|
|
error = acpi_dev_pm_low_power(dev, adev, target_state);
|
|
if (error)
|
|
acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_suspend_late);
|
|
|
|
/**
|
|
* acpi_dev_resume_early - Put device into the full-power state using ACPI.
|
|
* @dev: Device to put into the full-power state.
|
|
*
|
|
* Put the given device into the full-power state using the standard ACPI
|
|
* mechanism during system transition to the working state. Set the power
|
|
* state of the device to ACPI D0 and disable remote wakeup.
|
|
*/
|
|
int acpi_dev_resume_early(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
int error;
|
|
|
|
if (!adev)
|
|
return 0;
|
|
|
|
error = acpi_dev_pm_full_power(adev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_UNKNOWN, false);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_resume_early);
|
|
|
|
/**
|
|
* acpi_subsys_prepare - Prepare device for system transition to a sleep state.
|
|
* @dev: Device to prepare.
|
|
*/
|
|
int acpi_subsys_prepare(struct device *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
u32 sys_target;
|
|
int ret, state;
|
|
|
|
ret = pm_generic_prepare(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!adev || !pm_runtime_suspended(dev)
|
|
|| device_may_wakeup(dev) != !!adev->wakeup.prepare_count)
|
|
return 0;
|
|
|
|
sys_target = acpi_target_system_state();
|
|
if (sys_target == ACPI_STATE_S0)
|
|
return 1;
|
|
|
|
if (adev->power.flags.dsw_present)
|
|
return 0;
|
|
|
|
ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state);
|
|
return !ret && state == adev->power.state;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
|
|
|
|
/**
|
|
* acpi_subsys_complete - Finalize device's resume during system resume.
|
|
* @dev: Device to handle.
|
|
*/
|
|
void acpi_subsys_complete(struct device *dev)
|
|
{
|
|
/*
|
|
* If the device had been runtime-suspended before the system went into
|
|
* the sleep state it is going out of and it has never been resumed till
|
|
* now, resume it in case the firmware powered it up.
|
|
*/
|
|
if (dev->power.direct_complete)
|
|
pm_request_resume(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_complete);
|
|
|
|
/**
|
|
* acpi_subsys_suspend - Run the device driver's suspend callback.
|
|
* @dev: Device to handle.
|
|
*
|
|
* Follow PCI and resume devices suspended at run time before running their
|
|
* system suspend callbacks.
|
|
*/
|
|
int acpi_subsys_suspend(struct device *dev)
|
|
{
|
|
pm_runtime_resume(dev);
|
|
return pm_generic_suspend(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_suspend);
|
|
|
|
/**
|
|
* acpi_subsys_suspend_late - Suspend device using ACPI.
|
|
* @dev: Device to suspend.
|
|
*
|
|
* Carry out the generic late suspend procedure for @dev and use ACPI to put
|
|
* it into a low-power state during system transition into a sleep state.
|
|
*/
|
|
int acpi_subsys_suspend_late(struct device *dev)
|
|
{
|
|
int ret = pm_generic_suspend_late(dev);
|
|
return ret ? ret : acpi_dev_suspend_late(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
|
|
|
|
/**
|
|
* acpi_subsys_resume_early - Resume device using ACPI.
|
|
* @dev: Device to Resume.
|
|
*
|
|
* Use ACPI to put the given device into the full-power state and carry out the
|
|
* generic early resume procedure for it during system transition into the
|
|
* working state.
|
|
*/
|
|
int acpi_subsys_resume_early(struct device *dev)
|
|
{
|
|
int ret = acpi_dev_resume_early(dev);
|
|
return ret ? ret : pm_generic_resume_early(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_resume_early);
|
|
|
|
/**
|
|
* acpi_subsys_freeze - Run the device driver's freeze callback.
|
|
* @dev: Device to handle.
|
|
*/
|
|
int acpi_subsys_freeze(struct device *dev)
|
|
{
|
|
/*
|
|
* This used to be done in acpi_subsys_prepare() for all devices and
|
|
* some drivers may depend on it, so do it here. Ideally, however,
|
|
* runtime-suspended devices should not be touched during freeze/thaw
|
|
* transitions.
|
|
*/
|
|
pm_runtime_resume(dev);
|
|
return pm_generic_freeze(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_subsys_freeze);
|
|
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static struct dev_pm_domain acpi_general_pm_domain = {
|
|
.ops = {
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
.runtime_suspend = acpi_subsys_runtime_suspend,
|
|
.runtime_resume = acpi_subsys_runtime_resume,
|
|
#endif
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.prepare = acpi_subsys_prepare,
|
|
.complete = acpi_subsys_complete,
|
|
.suspend = acpi_subsys_suspend,
|
|
.suspend_late = acpi_subsys_suspend_late,
|
|
.resume_early = acpi_subsys_resume_early,
|
|
.freeze = acpi_subsys_freeze,
|
|
.poweroff = acpi_subsys_suspend,
|
|
.poweroff_late = acpi_subsys_suspend_late,
|
|
.restore_early = acpi_subsys_resume_early,
|
|
#endif
|
|
},
|
|
};
|
|
|
|
/**
|
|
* acpi_dev_pm_detach - Remove ACPI power management from the device.
|
|
* @dev: Device to take care of.
|
|
* @power_off: Whether or not to try to remove power from the device.
|
|
*
|
|
* Remove the device from the general ACPI PM domain and remove its wakeup
|
|
* notifier. If @power_off is set, additionally remove power from the device if
|
|
* possible.
|
|
*
|
|
* Callers must ensure proper synchronization of this function with power
|
|
* management callbacks.
|
|
*/
|
|
static void acpi_dev_pm_detach(struct device *dev, bool power_off)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
|
|
if (adev && dev->pm_domain == &acpi_general_pm_domain) {
|
|
dev->pm_domain = NULL;
|
|
acpi_remove_pm_notifier(adev);
|
|
if (power_off) {
|
|
/*
|
|
* If the device's PM QoS resume latency limit or flags
|
|
* have been exposed to user space, they have to be
|
|
* hidden at this point, so that they don't affect the
|
|
* choice of the low-power state to put the device into.
|
|
*/
|
|
dev_pm_qos_hide_latency_limit(dev);
|
|
dev_pm_qos_hide_flags(dev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_pm_attach - Prepare device for ACPI power management.
|
|
* @dev: Device to prepare.
|
|
* @power_on: Whether or not to power on the device.
|
|
*
|
|
* If @dev has a valid ACPI handle that has a valid struct acpi_device object
|
|
* attached to it, install a wakeup notification handler for the device and
|
|
* add it to the general ACPI PM domain. If @power_on is set, the device will
|
|
* be put into the ACPI D0 state before the function returns.
|
|
*
|
|
* This assumes that the @dev's bus type uses generic power management callbacks
|
|
* (or doesn't use any power management callbacks at all).
|
|
*
|
|
* Callers must ensure proper synchronization of this function with power
|
|
* management callbacks.
|
|
*/
|
|
int acpi_dev_pm_attach(struct device *dev, bool power_on)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(dev);
|
|
|
|
if (!adev)
|
|
return -ENODEV;
|
|
|
|
if (dev->pm_domain)
|
|
return -EEXIST;
|
|
|
|
acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
|
|
dev->pm_domain = &acpi_general_pm_domain;
|
|
if (power_on) {
|
|
acpi_dev_pm_full_power(adev);
|
|
acpi_device_wakeup(adev, ACPI_STATE_S0, false);
|
|
}
|
|
|
|
dev->pm_domain->detach = acpi_dev_pm_detach;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
|
|
#endif /* CONFIG_PM */
|