184 lines
3.8 KiB
C
184 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2010 Brian King IBM Corporation
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*/
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/suspend.h>
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#include <linux/stat.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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#include <asm/mmu.h>
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#include <asm/rtas.h>
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#include <asm/topology.h>
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static struct device suspend_dev;
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/**
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* pseries_suspend_begin - First phase of hibernation
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*
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* Check to ensure we are in a valid state to hibernate
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*
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* Return value:
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* 0 on success / other on failure
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**/
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static int pseries_suspend_begin(u64 stream_id)
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{
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long vasi_state, rc;
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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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if (rc) {
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pr_err("pseries_suspend_begin: vasi_state returned %ld\n",rc);
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return rc;
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} else if (vasi_state == H_VASI_ENABLED) {
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return -EAGAIN;
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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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vasi_state);
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return -EIO;
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}
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return 0;
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}
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/**
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* pseries_suspend_enter - Final phase of hibernation
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*
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* Return value:
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* 0 on success / other on failure
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**/
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static int pseries_suspend_enter(suspend_state_t state)
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{
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return rtas_ibm_suspend_me(NULL);
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}
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/**
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* store_hibernate - Initiate partition hibernation
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* @dev: subsys root device
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* @attr: device attribute struct
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* @buf: buffer
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* @count: buffer size
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*
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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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*
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* Return value:
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* number of bytes printed to buffer / other on failure
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**/
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static ssize_t store_hibernate(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u64 stream_id;
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int rc;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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stream_id = simple_strtoul(buf, NULL, 16);
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do {
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rc = pseries_suspend_begin(stream_id);
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if (rc == -EAGAIN)
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ssleep(1);
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} while (rc == -EAGAIN);
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if (!rc)
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rc = pm_suspend(PM_SUSPEND_MEM);
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if (!rc) {
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rc = count;
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post_mobility_fixup();
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}
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return rc;
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}
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#define USER_DT_UPDATE 0
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#define KERN_DT_UPDATE 1
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/**
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* show_hibernate - Report device tree update responsibilty
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* @dev: subsys root device
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* @attr: device attribute struct
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* @buf: buffer
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*
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* Report whether a device tree update is performed by the kernel after a
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* resume, or if drmgr must coordinate the update from user space.
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*
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* Return value:
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* 0 if drmgr is to initiate update, and 1 otherwise
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**/
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static ssize_t show_hibernate(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%d\n", KERN_DT_UPDATE);
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}
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static DEVICE_ATTR(hibernate, 0644, show_hibernate, store_hibernate);
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static struct bus_type suspend_subsys = {
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.name = "power",
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.dev_name = "power",
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};
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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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.enter = pseries_suspend_enter,
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};
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/**
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* pseries_suspend_sysfs_register - Register with sysfs
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*
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* Return value:
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* 0 on success / other on failure
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**/
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static int pseries_suspend_sysfs_register(struct device *dev)
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{
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int rc;
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if ((rc = subsys_system_register(&suspend_subsys, NULL)))
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return rc;
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dev->id = 0;
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dev->bus = &suspend_subsys;
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if ((rc = device_create_file(suspend_subsys.dev_root, &dev_attr_hibernate)))
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goto subsys_unregister;
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return 0;
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subsys_unregister:
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bus_unregister(&suspend_subsys);
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return rc;
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}
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/**
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* pseries_suspend_init - initcall for pSeries suspend
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*
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* Return value:
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* 0 on success / other on failure
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**/
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static int __init pseries_suspend_init(void)
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{
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int rc;
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if (!firmware_has_feature(FW_FEATURE_LPAR))
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return 0;
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if ((rc = pseries_suspend_sysfs_register(&suspend_dev)))
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return rc;
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suspend_set_ops(&pseries_suspend_ops);
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return 0;
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}
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machine_device_initcall(pseries, pseries_suspend_init);
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