[PATCH] Xen physical cpus online/offline sys interface
From: Liu , Jinsong
Date: Mon Jun 11 2012 - 08:38:08 EST
This patch provide Xen physical cpus online/offline sys interface.
User can use it for their own purpose, like power saving:
by offlining some cpus when light workload it save power greatly.
Its basic workflow is, user online/offline cpu via sys interface,
then hypercall xen to implement, after done xen inject virq back to dom0,
and then dom0 sync cpu status.
Signed-off-by: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>
Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
---
.../ABI/testing/sysfs-devices-system-xen_cpu | 20 +
drivers/xen/Makefile | 1 +
drivers/xen/pcpu.c | 371 ++++++++++++++++=
++++
include/xen/interface/platform.h | 8 +
include/xen/interface/xen.h | 1 +
5 files changed, 401 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-devices-system-xen_cpu
create mode 100644 drivers/xen/pcpu.c
diff --git a/Documentation/ABI/testing/sysfs-devices-system-xen_cpu b/Docum=
entation/ABI/testing/sysfs-devices-system-xen_cpu
new file mode 100644
index 0000000..9ca02fb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-system-xen_cpu
@@ -0,0 +1,20 @@
+What: /sys/devices/system/xen_cpu/
+Date: May 2012
+Contact: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
+Description:
+ A collection of global/individual Xen physical cpu attributes
+
+ Individual physical cpu attributes are contained in
+ subdirectories named by the Xen's logical cpu number, e.g.:
+ /sys/devices/system/xen_cpu/xen_cpu#/
+
+
+What: /sys/devices/system/xen_cpu/xen_cpu#/online
+Date: May 2012
+Contact: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
+Description:
+ Interface to online/offline Xen physical cpus
+
+ When running under Xen platform, it provide user interface
+ to online/offline physical cpus, except cpu0 due to several
+ logic restrictions and assumptions.
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index a787029..d80bea5 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_XEN_SYS_HYPERVISOR) +=3D sys-hypervisor.o
obj-$(CONFIG_XEN_PVHVM) +=3D platform-pci.o
obj-$(CONFIG_XEN_TMEM) +=3D tmem.o
obj-$(CONFIG_SWIOTLB_XEN) +=3D swiotlb-xen.o
+obj-$(CONFIG_XEN_DOM0) +=3D pcpu.o
obj-$(CONFIG_XEN_DOM0) +=3D pci.o acpi.o
obj-$(CONFIG_XEN_MCE_LOG) +=3D mcelog.o
obj-$(CONFIG_XEN_PCIDEV_BACKEND) +=3D xen-pciback/
diff --git a/drivers/xen/pcpu.c b/drivers/xen/pcpu.c
new file mode 100644
index 0000000..067fcfa
--- /dev/null
+++ b/drivers/xen/pcpu.c
@@ -0,0 +1,371 @@
+/*************************************************************************=
*****
+ * pcpu.c
+ * Management physical cpu in dom0, get pcpu info and provide sys interfac=
e
+ *
+ * Copyright (c) 2012 Intel Corporation
+ * Author: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
+ * Author: Jiang, Yunhong <yunhong.jiang@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a=
copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modi=
fy,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Softw=
are,
+ * and to permit persons to whom the Software is furnished to do so, subje=
ct to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included=
in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS=
OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY=
,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL=
THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEA=
LINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/cpu.h>
+#include <linux/stat.h>
+#include <linux/capability.h>
+
+#include <xen/xen.h>
+#include <xen/xenbus.h>
+#include <xen/events.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/hypercall.h>
+
+#define XEN_PCPU "xen_cpu: "
+
+/*
+ * @cpu_id: Xen physical cpu logic number
+ * @flags: Xen physical cpu status flag
+ * - XEN_PCPU_FLAGS_ONLINE: cpu is online
+ * - XEN_PCPU_FLAGS_INVALID: cpu is not present
+ */
+struct pcpu {
+ struct list_head list;
+ struct device dev;
+ uint32_t cpu_id;
+ uint32_t flags;
+};
+
+static struct bus_type xen_pcpu_subsys =3D {
+ .name =3D "xen_cpu",
+ .dev_name =3D "xen_cpu",
+};
+
+static DEFINE_MUTEX(xen_pcpu_lock);
+
+static LIST_HEAD(xen_pcpus);
+
+static int xen_pcpu_down(uint32_t cpu_id)
+{
+ struct xen_platform_op op =3D {
+ .cmd =3D XENPF_cpu_offline,
+ .interface_version =3D XENPF_INTERFACE_VERSION,
+ .u.cpu_ol.cpuid =3D cpu_id,
+ };
+
+ return HYPERVISOR_dom0_op(&op);
+}
+
+static int xen_pcpu_up(uint32_t cpu_id)
+{
+ struct xen_platform_op op =3D {
+ .cmd =3D XENPF_cpu_online,
+ .interface_version =3D XENPF_INTERFACE_VERSION,
+ .u.cpu_ol.cpuid =3D cpu_id,
+ };
+
+ return HYPERVISOR_dom0_op(&op);
+}
+
+static ssize_t show_online(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct pcpu *cpu =3D container_of(dev, struct pcpu, dev);
+
+ return sprintf(buf, "%u\n", !!(cpu->flags & XEN_PCPU_FLAGS_ONLINE));
+}
+
+static ssize_t __ref store_online(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pcpu *pcpu =3D container_of(dev, struct pcpu, dev);
+ unsigned long long val;
+ ssize_t ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (kstrtoull(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ switch (val) {
+ case 0:
+ ret =3D xen_pcpu_down(pcpu->cpu_id);
+ break;
+ case 1:
+ ret =3D xen_pcpu_up(pcpu->cpu_id);
+ break;
+ default:
+ ret =3D -EINVAL;
+ }
+
+ if (ret >=3D 0)
+ ret =3D count;
+ return ret;
+}
+static DEVICE_ATTR(online, S_IRUGO | S_IWUSR, show_online, store_online);
+
+static bool xen_pcpu_online(uint32_t flags)
+{
+ return !!(flags & XEN_PCPU_FLAGS_ONLINE);
+}
+
+static void pcpu_online_status(struct xenpf_pcpuinfo *info,
+ struct pcpu *pcpu)
+{
+ if (xen_pcpu_online(info->flags) &&
+ !xen_pcpu_online(pcpu->flags)) {
+ /* the pcpu is onlined */
+ pcpu->flags |=3D XEN_PCPU_FLAGS_ONLINE;
+ kobject_uevent(&pcpu->dev.kobj, KOBJ_ONLINE);
+ } else if (!xen_pcpu_online(info->flags) &&
+ xen_pcpu_online(pcpu->flags)) {
+ /* The pcpu is offlined */
+ pcpu->flags &=3D ~XEN_PCPU_FLAGS_ONLINE;
+ kobject_uevent(&pcpu->dev.kobj, KOBJ_OFFLINE);
+ }
+}
+
+static struct pcpu *get_pcpu(uint32_t cpu_id)
+{
+ struct pcpu *pcpu;
+
+ list_for_each_entry(pcpu, &xen_pcpus, list) {
+ if (pcpu->cpu_id =3D=3D cpu_id)
+ return pcpu;
+ }
+
+ return NULL;
+}
+
+static void pcpu_release(struct device *dev)
+{
+ struct pcpu *pcpu =3D container_of(dev, struct pcpu, dev);
+
+ list_del(&pcpu->list);
+ kfree(pcpu);
+}
+
+static void unregister_and_remove_pcpu(struct pcpu *pcpu)
+{
+ struct device *dev;
+
+ if (!pcpu)
+ return;
+
+ dev =3D &pcpu->dev;
+ if (dev->id)
+ device_remove_file(dev, &dev_attr_online);
+
+ /* pcpu remove would be implicitly done */
+ device_unregister(dev);
+}
+
+static int register_pcpu(struct pcpu *pcpu)
+{
+ struct device *dev;
+ int err =3D -EINVAL;
+
+ if (!pcpu)
+ return err;
+
+ dev =3D &pcpu->dev;
+ dev->bus =3D &xen_pcpu_subsys;
+ dev->id =3D pcpu->cpu_id;
+ dev->release =3D pcpu_release;
+
+ err =3D device_register(dev);
+ if (err) {
+ pcpu_release(dev);
+ return err;
+ }
+
+ /*
+ * Xen never offline cpu0 due to several restrictions
+ * and assumptions. This basically doesn't add a sys control
+ * to user, one cannot attempt to offline BSP.
+ */
+ if (dev->id) {
+ err =3D device_create_file(dev, &dev_attr_online);
+ if (err) {
+ device_unregister(dev);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static struct pcpu *create_and_register_pcpu(struct xenpf_pcpuinfo *info)
+{
+ struct pcpu *pcpu;
+ int err;
+
+ if (info->flags & XEN_PCPU_FLAGS_INVALID)
+ return ERR_PTR(-ENODEV);
+
+ pcpu =3D kzalloc(sizeof(struct pcpu), GFP_KERNEL);
+ if (!pcpu)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&pcpu->list);
+ pcpu->cpu_id =3D info->xen_cpuid;
+ pcpu->flags =3D info->flags;
+
+ /* Need hold on xen_pcpu_lock before pcpu list manipulations */
+ list_add_tail(&pcpu->list, &xen_pcpus);
+
+ err =3D register_pcpu(pcpu);
+ if (err) {
+ pr_warning(XEN_PCPU "Failed to register pcpu%u\n",
+ info->xen_cpuid);
+ return ERR_PTR(-ENOENT);
+ }
+
+ return pcpu;
+}
+
+/*
+ * Caller should hold the xen_pcpu_lock
+ */
+static int sync_pcpu(uint32_t cpu, uint32_t *max_cpu)
+{
+ int ret;
+ struct pcpu *pcpu =3D NULL;
+ struct xenpf_pcpuinfo *info;
+ struct xen_platform_op op =3D {
+ .cmd =3D XENPF_get_cpuinfo,
+ .interface_version =3D XENPF_INTERFACE_VERSION,
+ .u.pcpu_info.xen_cpuid =3D cpu,
+ };
+
+ ret =3D HYPERVISOR_dom0_op(&op);
+ if (ret)
+ return ret;
+
+ info =3D &op.u.pcpu_info;
+ if (max_cpu)
+ *max_cpu =3D info->max_present;
+
+ pcpu =3D get_pcpu(cpu);
+
+ /*
+ * Only those at cpu present map has its sys interface.
+ */
+ if (info->flags & XEN_PCPU_FLAGS_INVALID) {
+ if (pcpu)
+ unregister_and_remove_pcpu(pcpu);
+ return 0;
+ }
+
+ if (!pcpu) {
+ pcpu =3D create_and_register_pcpu(info);
+ if (IS_ERR_OR_NULL(pcpu))
+ return -ENODEV;
+ } else
+ pcpu_online_status(info, pcpu);
+
+ return 0;
+}
+
+/*
+ * Sync dom0's pcpu information with xen hypervisor's
+ */
+static int xen_sync_pcpus(void)
+{
+ /*
+ * Boot cpu always have cpu_id 0 in xen
+ */
+ uint32_t cpu =3D 0, max_cpu =3D 0;
+ int err =3D 0;
+ struct pcpu *pcpu, *tmp;
+
+ mutex_lock(&xen_pcpu_lock);
+
+ while (!err && (cpu <=3D max_cpu)) {
+ err =3D sync_pcpu(cpu, &max_cpu);
+ cpu++;
+ }
+
+ if (err)
+ list_for_each_entry_safe(pcpu, tmp, &xen_pcpus, list)
+ unregister_and_remove_pcpu(pcpu);
+
+ mutex_unlock(&xen_pcpu_lock);
+
+ return err;
+}
+
+static void xen_pcpu_work_fn(struct work_struct *work)
+{
+ xen_sync_pcpus();
+}
+static DECLARE_WORK(xen_pcpu_work, xen_pcpu_work_fn);
+
+static irqreturn_t xen_pcpu_interrupt(int irq, void *dev_id)
+{
+ schedule_work(&xen_pcpu_work);
+ return IRQ_HANDLED;
+}
+
+static int __init xen_pcpu_init(void)
+{
+ int irq, ret;
+
+ if (!xen_initial_domain())
+ return -ENODEV;
+
+ irq =3D bind_virq_to_irqhandler(VIRQ_PCPU_STATE, 0,
+ xen_pcpu_interrupt, 0,
+ "xen-pcpu", NULL);
+ if (irq < 0) {
+ pr_warning(XEN_PCPU "Failed to bind pcpu virq\n");
+ return irq;
+ }
+
+ ret =3D subsys_system_register(&xen_pcpu_subsys, NULL);
+ if (ret) {
+ pr_warning(XEN_PCPU "Failed to register pcpu subsys\n");
+ goto err1;
+ }
+
+ ret =3D xen_sync_pcpus();
+ if (ret) {
+ pr_warning(XEN_PCPU "Failed to sync pcpu info\n");
+ goto err2;
+ }
+
+ return 0;
+
+err2:
+ bus_unregister(&xen_pcpu_subsys);
+err1:
+ unbind_from_irqhandler(irq, NULL);
+ return ret;
+}
+arch_initcall(xen_pcpu_init);
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platf=
orm.h
index 486653f..61fa661 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -314,6 +314,13 @@ struct xenpf_pcpuinfo {
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_pcpuinfo);
=20
+#define XENPF_cpu_online 56
+#define XENPF_cpu_offline 57
+struct xenpf_cpu_ol {
+ uint32_t cpuid;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xenpf_cpu_ol);
+
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -330,6 +337,7 @@ struct xen_platform_op {
struct xenpf_getidletime getidletime;
struct xenpf_set_processor_pminfo set_pminfo;
struct xenpf_pcpuinfo pcpu_info;
+ struct xenpf_cpu_ol cpu_ol;
uint8_t pad[128];
} u;
};
diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index a890804..0801468 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -80,6 +80,7 @@
#define VIRQ_CONSOLE 2 /* (DOM0) Bytes received on emergency console. =
*/
#define VIRQ_DOM_EXC 3 /* (DOM0) Exceptional event for some domain. =
*/
#define VIRQ_DEBUGGER 6 /* (DOM0) A domain has paused for debugging. =
*/
+#define VIRQ_PCPU_STATE 9 /* (DOM0) PCPU state changed =
*/
=20
/* Architecture-specific VIRQ definitions. */
#define VIRQ_ARCH_0 16
--=20
1.7.1
--_002_DE8DF0795D48FD4CA783C40EC82923352259E4SHSMSX101ccrcorpi_
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Content-Description: 0001-Xen-physical-cpus-online-offline-sys-interface.patch
Content-Disposition: attachment;
filename="0001-Xen-physical-cpus-online-offline-sys-interface.patch";
size=12976; creation-date="Mon, 11 Jun 2012 05:50:08 GMT";
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