Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752145Ab2FKF4o (ORCPT ); Mon, 11 Jun 2012 01:56:44 -0400 Received: from mga14.intel.com ([143.182.124.37]:48099 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750712Ab2FKF4m (ORCPT ); Mon, 11 Jun 2012 01:56:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208,223";a="110541021" From: "Liu, Jinsong" To: Konrad Rzeszutek Wilk CC: "'xen-devel@lists.xensource.com'" , "'linux-kernel@vger.kernel.org'" Subject: [PATCH] Xen physical cpus online/offline sys interface Thread-Topic: [PATCH] Xen physical cpus online/offline sys interface Thread-Index: Ac1HlvJigoMtmxewSn6Qfo6O3a56Lw== Date: Mon, 11 Jun 2012 05:56:29 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.239.127.40] Content-Type: multipart/mixed; boundary="_002_DE8DF0795D48FD4CA783C40EC82923352259E4SHSMSX101ccrcorpi_" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 31914 Lines: 759 --_002_DE8DF0795D48FD4CA783C40EC82923352259E4SHSMSX101ccrcorpi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Konrad, Our old patch of cpu online/offline is based on old kernel tree. I rebase it to your latest xen.git git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git branch devel= /mce.v3 Thanks, Jinsong =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >From 29152bb054d87334ef970ad037888b7bb032f8ef Mon Sep 17 00:00:00 2001 From: Liu, Jinsong Date: Mon, 11 Jun 2012 20:38:08 +0800 Subject: [PATCH] Xen physical cpus online/offline sys interface 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 Signed-off-by: Liu, Jinsong --- .../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 +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 +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 + * Author: Jiang, Yunhong + * + * 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 +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#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_ Content-Type: application/octet-stream; name="0001-Xen-physical-cpus-online-offline-sys-interface.patch" 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"; modification-date="Mon, 11 Jun 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