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* Copyright (C) 2010 Brian King IBM Corporation
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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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* 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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* 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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#include <linux/delay.h>
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#include <linux/suspend.h>
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#include <asm/firmware.h>
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#include <asm/hvcall.h>
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#include <asm/machdep.h>
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static struct sys_device suspend_sysdev;
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static DECLARE_COMPLETION(suspend_work);
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static struct rtas_suspend_me_data suspend_data;
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static atomic_t suspending;
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* pseries_suspend_begin - First phase of hibernation
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* Check to ensure we are in a valid state to hibernate
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* 0 on success / other on failure
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static int pseries_suspend_begin(suspend_state_t state)
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unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
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/* Make sure the state is valid */
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rc = plpar_hcall(H_VASI_STATE, retbuf, stream_id);
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vasi_state = retbuf[0];
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pr_err("pseries_suspend_begin: vasi_state returned %ld\n",rc);
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} else if (vasi_state == H_VASI_ENABLED) {
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} else if (vasi_state != H_VASI_SUSPENDING) {
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pr_err("pseries_suspend_begin: vasi_state returned state %ld\n",
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* pseries_suspend_cpu - Suspend a single CPU
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* Makes the H_JOIN call to suspend the CPU
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static int pseries_suspend_cpu(void)
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if (atomic_read(&suspending))
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return rtas_suspend_cpu(&suspend_data);
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* pseries_suspend_enter - Final phase of hibernation
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* 0 on success / other on failure
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static int pseries_suspend_enter(suspend_state_t state)
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int rc = rtas_suspend_last_cpu(&suspend_data);
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atomic_set(&suspending, 0);
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atomic_set(&suspend_data.done, 1);
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* pseries_prepare_late - Prepare to suspend all other CPUs
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* 0 on success / other on failure
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static int pseries_prepare_late(void)
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atomic_set(&suspending, 1);
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atomic_set(&suspend_data.working, 0);
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atomic_set(&suspend_data.done, 0);
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atomic_set(&suspend_data.error, 0);
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suspend_data.complete = &suspend_work;
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INIT_COMPLETION(suspend_work);
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* store_hibernate - Initiate partition hibernation
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* @classdev: sysdev class struct
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* @attr: class device attribute struct
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* @count: buffer size
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* Write the stream ID received from the HMC to this file
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* to trigger hibernating the partition
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* number of bytes printed to buffer / other on failure
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static ssize_t store_hibernate(struct sysdev_class *classdev,
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struct sysdev_class_attribute *attr,
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const char *buf, size_t count)
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if (!capable(CAP_SYS_ADMIN))
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stream_id = simple_strtoul(buf, NULL, 16);
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rc = pseries_suspend_begin(PM_SUSPEND_MEM);
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} while (rc == -EAGAIN);
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rc = pm_suspend(PM_SUSPEND_MEM);
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static SYSDEV_CLASS_ATTR(hibernate, S_IWUSR, NULL, store_hibernate);
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static struct sysdev_class suspend_sysdev_class = {
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static const struct platform_suspend_ops pseries_suspend_ops = {
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.valid = suspend_valid_only_mem,
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.begin = pseries_suspend_begin,
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.prepare_late = pseries_prepare_late,
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.enter = pseries_suspend_enter,
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* pseries_suspend_sysfs_register - Register with sysfs
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* 0 on success / other on failure
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static int pseries_suspend_sysfs_register(struct sys_device *sysdev)
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if ((rc = sysdev_class_register(&suspend_sysdev_class)))
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sysdev->cls = &suspend_sysdev_class;
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if ((rc = sysdev_class_create_file(&suspend_sysdev_class, &attr_hibernate)))
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goto class_unregister;
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sysdev_class_unregister(&suspend_sysdev_class);
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* pseries_suspend_init - initcall for pSeries suspend
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* 0 on success / other on failure
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static int __init pseries_suspend_init(void)
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if (!machine_is(pseries) || !firmware_has_feature(FW_FEATURE_LPAR))
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suspend_data.token = rtas_token("ibm,suspend-me");
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if (suspend_data.token == RTAS_UNKNOWN_SERVICE)
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if ((rc = pseries_suspend_sysfs_register(&suspend_sysdev)))
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ppc_md.suspend_disable_cpu = pseries_suspend_cpu;
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suspend_set_ops(&pseries_suspend_ops);
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__initcall(pseries_suspend_init);