Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966437Ab2JZU0n (ORCPT ); Fri, 26 Oct 2012 16:26:43 -0400 Received: from acsinet15.oracle.com ([141.146.126.227]:51014 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966399Ab2JZU0m (ORCPT ); Fri, 26 Oct 2012 16:26:42 -0400 Date: Fri, 26 Oct 2012 16:14:09 -0400 From: Konrad Rzeszutek Wilk To: "Liu, Jinsong" Cc: Jan Beulich , "xen-devel@lists.xen.org" , "linux-kernel@vger.kernel.org" , Konrad Rzeszutek Wilk Subject: Re: [Xen-devel] [PATCH 1/2] Xen acpi pad implement Message-ID: <20121026201409.GF2708@phenom.dumpdata.com> References: <5089676602000078000A4928@nat28.tlf.novell.com> <508A89CB020000780008E6ED@nat28.tlf.novell.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9242 Lines: 309 On Fri, Oct 26, 2012 at 02:00:36PM +0000, Liu, Jinsong wrote: > Updated per Jan's comments. > > Thanks, > Jinsong > > =============== > > >From e6d4eceba9538c6873f9c970425e65e257fd9bf0 Mon Sep 17 00:00:00 2001 > From: Liu, Jinsong > Date: Sat, 27 Oct 2012 05:34:50 +0800 > Subject: [PATCH 1/2] Xen acpi pad implement > > PAD is acpi Processor Aggregator Device which provides a control point > that enables the platform to perform specific processor configuration > and control that applies to all processors in the platform. > > This patch is to implement Xen acpi pad logic. When running under Xen > virt platform, native pad driver would not work. Instead Xen pad driver, > a self-contained and very thin logic level, would take over acpi pad staff. > When acpi pad notify OSPM, xen pad logic intercept and parse _PUR object > and then hypercall to hyervisor for the rest work, say, core parking. > > Signed-off-by: Liu, Jinsong > --- > drivers/xen/Makefile | 1 + > drivers/xen/xen_acpi_pad.c | 201 ++++++++++++++++++++++++++++++++++++++ > include/xen/interface/platform.h | 17 +++ > 3 files changed, 219 insertions(+), 0 deletions(-) > create mode 100644 drivers/xen/xen_acpi_pad.c > > diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile > index 0e86370..a2af622 100644 > --- a/drivers/xen/Makefile > +++ b/drivers/xen/Makefile > @@ -29,6 +29,7 @@ obj-$(CONFIG_XEN_MCE_LOG) += mcelog.o > obj-$(CONFIG_XEN_PCIDEV_BACKEND) += xen-pciback/ > obj-$(CONFIG_XEN_PRIVCMD) += xen-privcmd.o > obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o > +obj-$(CONFIG_XEN_DOM0) += xen_acpi_pad.o We should have a Kconfig option. In it, please mention what version of hypervisor supports this functionality. > xen-evtchn-y := evtchn.o > xen-gntdev-y := gntdev.o > xen-gntalloc-y := gntalloc.o > diff --git a/drivers/xen/xen_acpi_pad.c b/drivers/xen/xen_acpi_pad.c > new file mode 100644 > index 0000000..0f1a1e6 > --- /dev/null > +++ b/drivers/xen/xen_acpi_pad.c > @@ -0,0 +1,201 @@ > +/* > + * xen_acpi_pad.c - Xen pad interface > + * > + * Copyright (c) 2012, Intel Corporation. > + * Author: Liu, Jinsong > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms and conditions of the GNU General Public License, > + * version 2, as published by the Free Software Foundation. > + * > + * This program is distributed in the hope 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. > + */ > + > +#include > +#include > +#include > +#include > +#include > + > +#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) || \ > + defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) I don't think you need that. > + > +#define ACPI_PROCESSOR_AGGREGATOR_CLASS "acpi_pad" > +#define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator" > +#define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80 > + > +static DEFINE_MUTEX(xen_pad_lock); > + > +static int xen_pad_set_idle_cpus(int num_cpus) > +{ > + struct xen_platform_op op; > + > + if (num_cpus < 0) > + return -EINVAL; > + > + /* set cpu nums expected to be idled */ > + op.cmd = XENPF_core_parking; > + op.u.core_parking.type = XEN_CORE_PARKING_SET; > + op.u.core_parking.idle_nums = num_cpus; > + > + return HYPERVISOR_dom0_op(&op); > +} > + > +/* > + * Cannot get idle cpus by using hypercall once (shared with _SET) > + * because of the characteristic of Xen continue_hypercall_on_cpu > + */ > +static int xen_pad_get_idle_cpus(void) > +{ > + int ret; > + struct xen_platform_op op; > + > + /* get cpu nums actually be idled */ > + op.cmd = XENPF_core_parking; > + op.u.core_parking.type = XEN_CORE_PARKING_GET; > + ret = HYPERVISOR_dom0_op(&op); > + if (ret < 0) > + return ret; > + > + return op.u.core_parking.idle_nums; > +} > + > +/* > + * Query firmware how many CPUs should be idle > + * return -1 on failure > + */ > +static int xen_acpi_pad_pur(acpi_handle handle) > +{ > + struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; > + union acpi_object *package; > + int num = -1; > + > + if (ACPI_FAILURE(acpi_evaluate_object(handle, "_PUR", NULL, &buffer))) > + return num; > + > + if (!buffer.length || !buffer.pointer) > + return num; > + > + package = buffer.pointer; > + > + if (package->type == ACPI_TYPE_PACKAGE && > + package->package.count == 2 && > + package->package.elements[0].integer.value == 1) /* rev 1 */ > + > + num = package->package.elements[1].integer.value; > + > + kfree(buffer.pointer); > + return num; > +} > + > +/* Notify firmware how many CPUs are idle */ > +static void xen_acpi_pad_ost(acpi_handle handle, int stat, > + uint32_t idle_cpus) > +{ > + union acpi_object params[3] = { > + {.type = ACPI_TYPE_INTEGER,}, > + {.type = ACPI_TYPE_INTEGER,}, > + {.type = ACPI_TYPE_BUFFER,}, > + }; > + struct acpi_object_list arg_list = {3, params}; > + > + params[0].integer.value = ACPI_PROCESSOR_AGGREGATOR_NOTIFY; > + params[1].integer.value = stat; > + params[2].buffer.length = 4; > + params[2].buffer.pointer = (void *)&idle_cpus; > + acpi_evaluate_object(handle, "_OST", &arg_list, NULL); > +} > + > +static void xen_acpi_pad_handle_notify(acpi_handle handle) > +{ > + int num_cpus; > + > + num_cpus = xen_acpi_pad_pur(handle); > + if (num_cpus < 0) > + return; > + > + mutex_lock(&xen_pad_lock); > + if (xen_pad_set_idle_cpus(num_cpus)) { > + mutex_unlock(&xen_pad_lock); > + return; > + } > + > + num_cpus = xen_pad_get_idle_cpus(); > + if (num_cpus < 0) { > + mutex_unlock(&xen_pad_lock); > + return; > + } > + mutex_unlock(&xen_pad_lock); > + > + xen_acpi_pad_ost(handle, 0, num_cpus); > +} > + > +static void xen_acpi_pad_notify(acpi_handle handle, u32 event, > + void *data) > +{ > + switch (event) { > + case ACPI_PROCESSOR_AGGREGATOR_NOTIFY: > + xen_acpi_pad_handle_notify(handle); > + break; > + default: > + pr_warn("Unsupported event [0x%x]\n", event); > + break; > + } > +} > + > +static int xen_acpi_pad_add(struct acpi_device *device) > +{ > + acpi_status status; > + > + strcpy(acpi_device_name(device), ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME); > + strcpy(acpi_device_class(device), ACPI_PROCESSOR_AGGREGATOR_CLASS); > + > + status = acpi_install_notify_handler(device->handle, > + ACPI_DEVICE_NOTIFY, xen_acpi_pad_notify, device); > + if (ACPI_FAILURE(status)) > + return -ENODEV; > + > + return 0; > +} > + > +static int xen_acpi_pad_remove(struct acpi_device *device, > + int type) > +{ > + mutex_lock(&xen_pad_lock); > + xen_pad_set_idle_cpus(0); > + mutex_unlock(&xen_pad_lock); > + > + acpi_remove_notify_handler(device->handle, > + ACPI_DEVICE_NOTIFY, xen_acpi_pad_notify); > + return 0; > +} > + > +static const struct acpi_device_id pad_device_ids[] = { > + {"ACPI000C", 0}, > + {"", 0}, > +}; > + > +static struct acpi_driver xen_acpi_pad_driver = { > + .name = "processor_aggregator", > + .class = ACPI_PROCESSOR_AGGREGATOR_CLASS, > + .ids = pad_device_ids, > + .ops = { > + .add = xen_acpi_pad_add, > + .remove = xen_acpi_pad_remove, > + }, > +}; > + > +static int __init xen_acpi_pad_init(void) > +{ > + /* Only DOM0 is responsible for Xen acpi pad */ > + if (xen_initial_domain()) > + return acpi_bus_register_driver(&xen_acpi_pad_driver); > + > + return -ENODEV; > +} > +subsys_initcall(xen_acpi_pad_init); No way of making this a module? It would be nice - perhaps have a stub function that registers the bus but does not do anything until this proper module is loaded? > + > +#endif > diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h > index 4755b5f..0f44376 100644 > --- a/include/xen/interface/platform.h > +++ b/include/xen/interface/platform.h > @@ -324,6 +324,22 @@ struct xenpf_cpu_ol { > }; > DEFINE_GUEST_HANDLE_STRUCT(xenpf_cpu_ol); > > +/* > + * CMD 58 and 59 are reserved for cpu hotadd and memory hotadd, > + * which already occupied at Xen hypervisor side. ^- are > + */ > +#define XENPF_core_parking 60 > +struct xenpf_core_parking { > + /* IN variables */ > +#define XEN_CORE_PARKING_SET 1 > +#define XEN_CORE_PARKING_GET 2 > + uint32_t type; > + /* IN variables: set cpu nums expected to be idled */ > + /* OUT variables: get cpu nums actually be idled */ > + uint32_t idle_nums; > +}; > +DEFINE_GUEST_HANDLE_STRUCT(xenpf_core_parking); > + > struct xen_platform_op { > uint32_t cmd; > uint32_t interface_version; /* XENPF_INTERFACE_VERSION */ > @@ -341,6 +357,7 @@ struct xen_platform_op { > struct xenpf_set_processor_pminfo set_pminfo; > struct xenpf_pcpuinfo pcpu_info; > struct xenpf_cpu_ol cpu_ol; > + struct xenpf_core_parking core_parking; > uint8_t pad[128]; > } u; > }; > -- > 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/