forked from Minki/linux
6b36ba8492
pHyp can change cache nodes for suspend/resume operation. Currently the device tree is updated by drmgr in userspace after all non boot CPUs are enabled. Hence, we do not modify the cache list based on the latest cache nodes. Also we do not remove cache entries for the primary CPU. This patch removes the cache list for the boot CPU, updates the device tree before enabling nonboot CPUs and adds cache list for the boot cpu. This patch also has the side effect that older versions of drmgr will perform a second device tree update from userspace. While this is a redundant waste of a couple cycles it is harmless since firmware returns the same data for the subsequent update-nodes/properties rtas calls. Signed-off-by: Haren Myneni <hbabu@us.ibm.com> Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
262 lines
6.0 KiB
C
262 lines
6.0 KiB
C
/*
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* Copyright (C) 2010 Brian King IBM Corporation
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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/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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#include "../../kernel/cacheinfo.h"
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static u64 stream_id;
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static struct device suspend_dev;
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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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/**
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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(suspend_state_t state)
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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_cpu - Suspend a single CPU
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*
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* Makes the H_JOIN call to suspend the CPU
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*
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**/
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static int pseries_suspend_cpu(void)
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{
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if (atomic_read(&suspending))
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return rtas_suspend_cpu(&suspend_data);
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return 0;
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}
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/**
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* pseries_suspend_enable_irqs
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*
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* Post suspend configuration updates
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*
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**/
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static void pseries_suspend_enable_irqs(void)
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{
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/*
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* Update configuration which can be modified based on device tree
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* changes during resume.
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*/
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cacheinfo_cpu_offline(smp_processor_id());
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post_mobility_fixup();
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cacheinfo_cpu_online(smp_processor_id());
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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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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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return rc;
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}
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/**
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* pseries_prepare_late - Prepare to suspend all other CPUs
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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_prepare_late(void)
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{
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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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reinit_completion(&suspend_work);
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return 0;
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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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cpumask_var_t offline_mask;
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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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if (!alloc_cpumask_var(&offline_mask, GFP_TEMPORARY))
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return -ENOMEM;
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stream_id = simple_strtoul(buf, NULL, 16);
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do {
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rc = pseries_suspend_begin(PM_SUSPEND_MEM);
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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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/* All present CPUs must be online */
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cpumask_andnot(offline_mask, cpu_present_mask,
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cpu_online_mask);
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rc = rtas_online_cpus_mask(offline_mask);
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if (rc) {
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pr_err("%s: Could not bring present CPUs online.\n",
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__func__);
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goto out;
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}
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stop_topology_update();
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rc = pm_suspend(PM_SUSPEND_MEM);
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start_topology_update();
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/* Take down CPUs not online prior to suspend */
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if (!rtas_offline_cpus_mask(offline_mask))
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pr_warn("%s: Could not restore CPUs to offline "
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"state.\n", __func__);
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}
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stream_id = 0;
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if (!rc)
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rc = count;
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out:
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free_cpumask_var(offline_mask);
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return rc;
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}
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static DEVICE_ATTR(hibernate, S_IWUSR, NULL, 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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.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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};
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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 (!machine_is(pseries) || !firmware_has_feature(FW_FEATURE_LPAR))
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return 0;
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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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return 0;
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if ((rc = pseries_suspend_sysfs_register(&suspend_dev)))
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return rc;
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ppc_md.suspend_disable_cpu = pseries_suspend_cpu;
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ppc_md.suspend_enable_irqs = pseries_suspend_enable_irqs;
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suspend_set_ops(&pseries_suspend_ops);
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return 0;
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}
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__initcall(pseries_suspend_init);
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