mirror of https://gitee.com/openkylin/linux.git
PM: Remove legacy PM
AFAICT pm_send_all is a nop when noone uses pm_register... Hmm.. can we just force CONFIG_PM_LEGACY=n, and see what happens? Or maybe this is better idea? It may break build somewhere, but it should be easy to fix... (it builds here, i386 and x86-64). Signed-off-by: Pavel Machek <pavel@suse.cz> Acked-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Pavel Machek
Len Brown
parent
a985aabe4d
commit
6afe1a1fe8
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@ -163,14 +163,11 @@ static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp,
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if ((mode != 1) && (mode != 5))
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return -EINVAL;
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retval = pm_send_all(PM_SUSPEND, (void *)3);
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if (retval == 0) {
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if (mode == 5)
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retval = pm_do_bus_sleep();
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else
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retval = pm_do_suspend();
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pm_send_all(PM_RESUME, (void *)0);
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}
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return retval;
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@ -183,9 +180,6 @@ static int try_set_cmode(int new_cmode)
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if (!(clock_cmodes_permitted & (1<<new_cmode)))
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return -EINVAL;
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/* tell all the drivers we're suspending */
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pm_send_all(PM_SUSPEND, (void *)3);
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/* now change cmode */
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local_irq_disable();
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frv_dma_pause_all();
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@ -201,8 +195,6 @@ static int try_set_cmode(int new_cmode)
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frv_dma_resume_all();
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local_irq_enable();
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/* tell all the drivers we're resuming */
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pm_send_all(PM_RESUME, (void *)0);
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return 0;
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}
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@ -258,7 +258,6 @@ int au_sleep(void)
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static int pm_do_sleep(ctl_table * ctl, int write, struct file *file,
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void __user *buffer, size_t * len, loff_t *ppos)
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{
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int retval = 0;
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#ifdef SLEEP_TEST_TIMEOUT
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#define TMPBUFLEN2 16
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char buf[TMPBUFLEN2], *p;
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@ -278,33 +277,21 @@ static int pm_do_sleep(ctl_table * ctl, int write, struct file *file,
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p = buf;
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sleep_ticks = simple_strtoul(p, &p, 0);
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#endif
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retval = pm_send_all(PM_SUSPEND, (void *) 2);
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if (retval)
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return retval;
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au_sleep();
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retval = pm_send_all(PM_RESUME, (void *) 0);
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}
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return retval;
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return 0;
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}
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static int pm_do_suspend(ctl_table * ctl, int write, struct file *file,
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void __user *buffer, size_t * len, loff_t *ppos)
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{
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int retval = 0;
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if (!write) {
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*len = 0;
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} else {
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retval = pm_send_all(PM_SUSPEND, (void *) 2);
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if (retval)
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return retval;
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suspend_mode = 1;
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retval = pm_send_all(PM_RESUME, (void *) 0);
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}
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return retval;
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return 0;
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}
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@ -1189,19 +1189,6 @@ static int suspend(int vetoable)
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int err;
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struct apm_user *as;
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if (pm_send_all(PM_SUSPEND, (void *)3)) {
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/* Vetoed */
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if (vetoable) {
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if (apm_info.connection_version > 0x100)
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set_system_power_state(APM_STATE_REJECT);
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err = -EBUSY;
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ignore_sys_suspend = 0;
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printk(KERN_WARNING "apm: suspend was vetoed.\n");
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goto out;
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}
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printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
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}
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device_suspend(PMSG_SUSPEND);
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local_irq_disable();
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device_power_down(PMSG_SUSPEND);
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@ -1224,7 +1211,6 @@ static int suspend(int vetoable)
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device_power_up();
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local_irq_enable();
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device_resume();
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pm_send_all(PM_RESUME, (void *)0);
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queue_event(APM_NORMAL_RESUME, NULL);
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out:
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spin_lock(&user_list_lock);
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@ -1337,7 +1323,6 @@ static void check_events(void)
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if ((event != APM_NORMAL_RESUME)
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|| (ignore_normal_resume == 0)) {
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device_resume();
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pm_send_all(PM_RESUME, (void *)0);
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queue_event(event, NULL);
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}
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ignore_normal_resume = 0;
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@ -19,16 +19,6 @@ config PM
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will issue the hlt instruction if nothing is to be done, thereby
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sending the processor to sleep and saving power.
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config PM_LEGACY
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bool "Legacy Power Management API (DEPRECATED)"
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depends on PM
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default n
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---help---
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Support for pm_register() and friends. This old API is obsoleted
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by the driver model.
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If unsure, say N.
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config PM_DEBUG
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bool "Power Management Debug Support"
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depends on PM
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@ -4,7 +4,6 @@ EXTRA_CFLAGS += -DDEBUG
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endif
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obj-y := main.o
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obj-$(CONFIG_PM_LEGACY) += pm.o
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obj-$(CONFIG_PM_SLEEP) += process.o console.o
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obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
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@ -1,205 +0,0 @@
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/*
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* pm.c - Power management interface
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*
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* Copyright (C) 2000 Andrew Henroid
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/pm.h>
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#include <linux/pm_legacy.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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/*
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* Locking notes:
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* pm_devs_lock can be a semaphore providing pm ops are not called
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* from an interrupt handler (already a bad idea so no change here). Each
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* change must be protected so that an unlink of an entry doesn't clash
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* with a pm send - which is permitted to sleep in the current architecture
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*
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* Module unloads clashing with pm events now work out safely, the module
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* unload path will block until the event has been sent. It may well block
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* until a resume but that will be fine.
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*/
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static DEFINE_MUTEX(pm_devs_lock);
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static LIST_HEAD(pm_devs);
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/**
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* pm_register - register a device with power management
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* @type: device type
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* @id: device ID
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* @callback: callback function
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*
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* Add a device to the list of devices that wish to be notified about
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* power management events. A &pm_dev structure is returned on success,
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* on failure the return is %NULL.
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*
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* The callback function will be called in process context and
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* it may sleep.
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*/
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struct pm_dev *pm_register(pm_dev_t type,
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unsigned long id,
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pm_callback callback)
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{
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struct pm_dev *dev = kzalloc(sizeof(struct pm_dev), GFP_KERNEL);
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if (dev) {
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dev->type = type;
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dev->id = id;
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dev->callback = callback;
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mutex_lock(&pm_devs_lock);
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list_add(&dev->entry, &pm_devs);
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mutex_unlock(&pm_devs_lock);
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}
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return dev;
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}
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/**
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* pm_send - send request to a single device
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* @dev: device to send to
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* @rqst: power management request
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* @data: data for the callback
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*
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* Issue a power management request to a given device. The
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* %PM_SUSPEND and %PM_RESUME events are handled specially. The
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* data field must hold the intended next state. No call is made
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* if the state matches.
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*
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* BUGS: what stops two power management requests occurring in parallel
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* and conflicting.
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*
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* WARNING: Calling pm_send directly is not generally recommended, in
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* particular there is no locking against the pm_dev going away. The
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* caller must maintain all needed locking or have 'inside knowledge'
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* on the safety. Also remember that this function is not locked against
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* pm_unregister. This means that you must handle SMP races on callback
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* execution and unload yourself.
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*/
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static int pm_send(struct pm_dev *dev, pm_request_t rqst, void *data)
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{
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int status = 0;
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unsigned long prev_state, next_state;
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if (in_interrupt())
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BUG();
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switch (rqst) {
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case PM_SUSPEND:
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case PM_RESUME:
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prev_state = dev->state;
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next_state = (unsigned long) data;
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if (prev_state != next_state) {
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if (dev->callback)
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status = (*dev->callback)(dev, rqst, data);
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if (!status) {
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dev->state = next_state;
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dev->prev_state = prev_state;
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}
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}
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else {
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dev->prev_state = prev_state;
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}
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break;
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default:
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if (dev->callback)
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status = (*dev->callback)(dev, rqst, data);
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break;
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}
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return status;
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}
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/*
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* Undo incomplete request
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*/
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static void pm_undo_all(struct pm_dev *last)
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{
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struct list_head *entry = last->entry.prev;
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while (entry != &pm_devs) {
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struct pm_dev *dev = list_entry(entry, struct pm_dev, entry);
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if (dev->state != dev->prev_state) {
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/* previous state was zero (running) resume or
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* previous state was non-zero (suspended) suspend
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*/
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pm_request_t undo = (dev->prev_state
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? PM_SUSPEND:PM_RESUME);
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pm_send(dev, undo, (void*) dev->prev_state);
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}
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entry = entry->prev;
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}
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}
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/**
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* pm_send_all - send request to all managed devices
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* @rqst: power management request
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* @data: data for the callback
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*
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* Issue a power management request to a all devices. The
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* %PM_SUSPEND events are handled specially. Any device is
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* permitted to fail a suspend by returning a non zero (error)
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* value from its callback function. If any device vetoes a
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* suspend request then all other devices that have suspended
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* during the processing of this request are restored to their
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* previous state.
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*
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* WARNING: This function takes the pm_devs_lock. The lock is not dropped until
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* the callbacks have completed. This prevents races against pm locking
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* functions, races against module unload pm_unregister code. It does
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* mean however that you must not issue pm_ functions within the callback
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* or you will deadlock and users will hate you.
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*
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* Zero is returned on success. If a suspend fails then the status
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* from the device that vetoes the suspend is returned.
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*
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* BUGS: what stops two power management requests occurring in parallel
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* and conflicting.
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*/
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int pm_send_all(pm_request_t rqst, void *data)
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{
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struct list_head *entry;
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mutex_lock(&pm_devs_lock);
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entry = pm_devs.next;
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while (entry != &pm_devs) {
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struct pm_dev *dev = list_entry(entry, struct pm_dev, entry);
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if (dev->callback) {
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int status = pm_send(dev, rqst, data);
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if (status) {
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/* return devices to previous state on
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* failed suspend request
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*/
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if (rqst == PM_SUSPEND)
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pm_undo_all(dev);
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mutex_unlock(&pm_devs_lock);
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return status;
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}
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}
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entry = entry->next;
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}
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mutex_unlock(&pm_devs_lock);
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return 0;
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}
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EXPORT_SYMBOL(pm_register);
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EXPORT_SYMBOL(pm_send_all);
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