[PATCHv2 2/2] powerpc: Partition hibernation support
Brian King
brking at linux.vnet.ibm.com
Thu Jul 8 08:31:02 EST 2010
Enables support for HMC initiated partition hibernation. This is
a firmware assisted hibernation, since the firmware handles writing
the memory out to disk, along with other partition information,
so we just mimic suspend to ram.
Signed-off-by: Brian King <brking at linux.vnet.ibm.com>
---
arch/powerpc/Kconfig | 2
arch/powerpc/include/asm/machdep.h | 1
arch/powerpc/platforms/pseries/Makefile | 4
arch/powerpc/platforms/pseries/hotplug-cpu.c | 3
arch/powerpc/platforms/pseries/suspend.c | 214 +++++++++++++++++++++++++++
5 files changed, 223 insertions(+), 1 deletion(-)
diff -puN /dev/null arch/powerpc/platforms/pseries/suspend.c
--- /dev/null 2009-12-15 17:58:07.000000000 -0600
+++ linux-2.6-bjking1/arch/powerpc/platforms/pseries/suspend.c 2010-06-16 13:49:30.000000000 -0500
@@ -0,0 +1,214 @@
+/*
+ * Copyright (C) 2010 Brian King IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/delay.h>
+#include <linux/suspend.h>
+#include <asm/firmware.h>
+#include <asm/hvcall.h>
+#include <asm/machdep.h>
+#include <asm/mmu.h>
+#include <asm/rtas.h>
+
+static u64 stream_id;
+static struct sys_device suspend_sysdev;
+static DECLARE_COMPLETION(suspend_work);
+static struct rtas_suspend_me_data suspend_data;
+static atomic_t suspending;
+
+/**
+ * pseries_suspend_begin - First phase of hibernation
+ *
+ * Check to ensure we are in a valid state to hibernate
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int pseries_suspend_begin(suspend_state_t state)
+{
+ long vasi_state, rc;
+ unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+
+ /* Make sure the state is valid */
+ rc = plpar_hcall(H_VASI_STATE, retbuf, stream_id);
+
+ vasi_state = retbuf[0];
+
+ if (rc) {
+ pr_err("pseries_suspend_begin: vasi_state returned %ld\n",rc);
+ return rc;
+ } else if (vasi_state == H_VASI_ENABLED) {
+ return -EAGAIN;
+ } else if (vasi_state != H_VASI_SUSPENDING) {
+ pr_err("pseries_suspend_begin: vasi_state returned state %ld\n",
+ vasi_state);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/**
+ * pseries_suspend_cpu - Suspend a single CPU
+ *
+ * Makes the H_JOIN call to suspend the CPU
+ *
+ **/
+static int pseries_suspend_cpu(void)
+{
+ if (atomic_read(&suspending))
+ return rtas_suspend_cpu(&suspend_data);
+ return 0;
+}
+
+/**
+ * pseries_suspend_enter - Final phase of hibernation
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int pseries_suspend_enter(suspend_state_t state)
+{
+ int rc = rtas_suspend_last_cpu(&suspend_data);
+
+ atomic_set(&suspending, 0);
+ atomic_set(&suspend_data.done, 1);
+ return rc;
+}
+
+/**
+ * pseries_prepare_late - Prepare to suspend all other CPUs
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int pseries_prepare_late(void)
+{
+ atomic_set(&suspending, 1);
+ atomic_set(&suspend_data.working, 0);
+ atomic_set(&suspend_data.done, 0);
+ atomic_set(&suspend_data.error, 0);
+ suspend_data.complete = &suspend_work;
+ INIT_COMPLETION(suspend_work);
+ return 0;
+}
+
+/**
+ * store_hibernate - Initiate partition hibernation
+ * @classdev: sysdev class struct
+ * @attr: class device attribute struct
+ * @buf: buffer
+ * @count: buffer size
+ *
+ * Write the stream ID received from the HMC to this file
+ * to trigger hibernating the partition
+ *
+ * Return value:
+ * number of bytes printed to buffer / other on failure
+ **/
+static ssize_t store_hibernate(struct sysdev_class *classdev,
+ struct sysdev_class_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rc;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ stream_id = simple_strtoul(buf, NULL, 16);
+
+ do {
+ rc = pseries_suspend_begin(PM_SUSPEND_MEM);
+ if (rc == -EAGAIN)
+ ssleep(1);
+ } while (rc == -EAGAIN);
+
+ if (!rc)
+ rc = pm_suspend(PM_SUSPEND_MEM);
+
+ stream_id = 0;
+
+ if (!rc)
+ rc = count;
+ return rc;
+}
+
+static SYSDEV_CLASS_ATTR(hibernate, S_IWUSR, NULL, store_hibernate);
+
+static struct sysdev_class suspend_sysdev_class = {
+ .name = "power",
+};
+
+static struct platform_suspend_ops pseries_suspend_ops = {
+ .valid = suspend_valid_only_mem,
+ .begin = pseries_suspend_begin,
+ .prepare_late = pseries_prepare_late,
+ .enter = pseries_suspend_enter,
+};
+
+/**
+ * pseries_suspend_sysfs_register - Register with sysfs
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int pseries_suspend_sysfs_register(struct sys_device *sysdev)
+{
+ int rc;
+
+ if ((rc = sysdev_class_register(&suspend_sysdev_class)))
+ return rc;
+
+ sysdev->id = 0;
+ sysdev->cls = &suspend_sysdev_class;
+
+ if ((rc = sysdev_class_create_file(&suspend_sysdev_class, &attr_hibernate)))
+ goto class_unregister;
+
+ return 0;
+
+class_unregister:
+ sysdev_class_unregister(&suspend_sysdev_class);
+ return rc;
+}
+
+/**
+ * pseries_suspend_init - initcall for pSeries suspend
+ *
+ * Return value:
+ * 0 on success / other on failure
+ **/
+static int __init pseries_suspend_init(void)
+{
+ int rc;
+
+ if (!machine_is(pseries) || !firmware_has_feature(FW_FEATURE_LPAR))
+ return 0;
+
+ suspend_data.token = rtas_token("ibm,suspend-me");
+ if (suspend_data.token == RTAS_UNKNOWN_SERVICE)
+ return 0;
+
+ if ((rc = pseries_suspend_sysfs_register(&suspend_sysdev)))
+ return rc;
+
+ ppc_md.suspend_disable_cpu = pseries_suspend_cpu;
+ suspend_set_ops(&pseries_suspend_ops);
+ return 0;
+}
+
+__initcall(pseries_suspend_init);
diff -puN arch/powerpc/Kconfig~powerpc_allarch_pseries_hibernation arch/powerpc/Kconfig
--- linux-2.6/arch/powerpc/Kconfig~powerpc_allarch_pseries_hibernation 2010-06-16 13:49:30.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/Kconfig 2010-06-16 13:49:30.000000000 -0500
@@ -218,7 +218,7 @@ config ARCH_HIBERNATION_POSSIBLE
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
- PPC_85xx || PPC_86xx
+ PPC_85xx || PPC_86xx || PPC_PSERIES
config PPC_DCR_NATIVE
bool
diff -puN arch/powerpc/platforms/pseries/Makefile~powerpc_allarch_pseries_hibernation arch/powerpc/platforms/pseries/Makefile
--- linux-2.6/arch/powerpc/platforms/pseries/Makefile~powerpc_allarch_pseries_hibernation 2010-06-16 13:49:30.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/platforms/pseries/Makefile 2010-06-16 13:49:30.000000000 -0500
@@ -26,3 +26,7 @@ obj-$(CONFIG_HCALL_STATS) += hvCall_inst
obj-$(CONFIG_PHYP_DUMP) += phyp_dump.o
obj-$(CONFIG_CMM) += cmm.o
obj-$(CONFIG_DTL) += dtl.o
+
+ifeq ($(CONFIG_PPC_PSERIES),y)
+obj-$(CONFIG_SUSPEND) += suspend.o
+endif
diff -puN arch/powerpc/include/asm/machdep.h~powerpc_allarch_pseries_hibernation arch/powerpc/include/asm/machdep.h
--- linux-2.6/arch/powerpc/include/asm/machdep.h~powerpc_allarch_pseries_hibernation 2010-06-16 13:49:30.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/include/asm/machdep.h 2010-06-16 13:49:30.000000000 -0500
@@ -266,6 +266,7 @@ struct machdep_calls {
void (*suspend_disable_irqs)(void);
void (*suspend_enable_irqs)(void);
#endif
+ int (*suspend_disable_cpu)(void);
#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
ssize_t (*cpu_probe)(const char *, size_t);
diff -puN arch/powerpc/platforms/pseries/hotplug-cpu.c~powerpc_allarch_pseries_hibernation arch/powerpc/platforms/pseries/hotplug-cpu.c
--- linux-2.6/arch/powerpc/platforms/pseries/hotplug-cpu.c~powerpc_allarch_pseries_hibernation 2010-06-16 13:49:30.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/platforms/pseries/hotplug-cpu.c 2010-06-16 13:49:30.000000000 -0500
@@ -116,6 +116,9 @@ static void pseries_mach_cpu_die(void)
if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) {
set_cpu_current_state(cpu, CPU_STATE_INACTIVE);
+ if (ppc_md.suspend_disable_cpu)
+ ppc_md.suspend_disable_cpu();
+
cede_latency_hint = 2;
get_lppaca()->idle = 1;
_
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