diff options
| -rw-r--r-- | drivers/xen/Makefile | 3 | ||||
| -rw-r--r-- | drivers/xen/xen-acpi-pad.c | 181 | ||||
| -rw-r--r-- | include/xen/interface/platform.h | 17 | ||||
| -rw-r--r-- | include/xen/interface/version.h | 15 |
4 files changed, 215 insertions, 1 deletions
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile index 0e863703..3c39717 100644 --- a/drivers/xen/Makefile +++ b/drivers/xen/Makefile @@ -10,7 +10,8 @@ CFLAGS_features.o := $(nostackp) dom0-$(CONFIG_PCI) += pci.o dom0-$(CONFIG_USB_SUPPORT) += dbgp.o -dom0-$(CONFIG_ACPI) += acpi.o +dom0-$(CONFIG_ACPI) += acpi.o $(xen-pad-y) +xen-pad-$(CONFIG_X86) += xen-acpi-pad.o dom0-$(CONFIG_X86) += pcpu.o obj-$(CONFIG_XEN_DOM0) += $(dom0-y) obj-$(CONFIG_BLOCK) += biomerge.o diff --git a/drivers/xen/xen-acpi-pad.c b/drivers/xen/xen-acpi-pad.c new file mode 100644 index 0000000..f23ecf38 --- /dev/null +++ b/drivers/xen/xen-acpi-pad.c @@ -0,0 +1,181 @@ +/* + * xen-acpi-pad.c - Xen pad interface + * + * Copyright (c) 2012, Intel Corporation. + * Author: Liu, Jinsong <jinsong.liu@intel.com> + * + * 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 <linux/kernel.h> +#include <linux/types.h> +#include <acpi/acpi_bus.h> +#include <acpi/acpi_drivers.h> +#include <asm/xen/hypercall.h> +#include <xen/interface/version.h> + +#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_cpu_lock); + +static int xen_acpi_pad_idle_cpus(unsigned int idle_nums) +{ + struct xen_platform_op op; + + op.cmd = XENPF_core_parking; + op.u.core_parking.type = XEN_CORE_PARKING_SET; + op.u.core_parking.idle_nums = idle_nums; + + return HYPERVISOR_dom0_op(&op); +} + +static int xen_acpi_pad_idle_cpus_num(void) +{ + struct xen_platform_op op; + + op.cmd = XENPF_core_parking; + op.u.core_parking.type = XEN_CORE_PARKING_GET; + + return HYPERVISOR_dom0_op(&op) + ?: op.u.core_parking.idle_nums; +} + +/* + * Query firmware how many CPUs should be idle + * return -1 on failure + */ +static int 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 acpi_pad_ost(acpi_handle handle, int stat, + uint32_t idle_nums) +{ + 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_nums; + acpi_evaluate_object(handle, "_OST", &arg_list, NULL); +} + +static void acpi_pad_handle_notify(acpi_handle handle) +{ + int idle_nums; + + mutex_lock(&xen_cpu_lock); + idle_nums = acpi_pad_pur(handle); + if (idle_nums < 0) { + mutex_unlock(&xen_cpu_lock); + return; + } + + idle_nums = xen_acpi_pad_idle_cpus(idle_nums) + ?: xen_acpi_pad_idle_cpus_num(); + if (idle_nums >= 0) + acpi_pad_ost(handle, 0, idle_nums); + mutex_unlock(&xen_cpu_lock); +} + +static void acpi_pad_notify(acpi_handle handle, u32 event, + void *data) +{ + switch (event) { + case ACPI_PROCESSOR_AGGREGATOR_NOTIFY: + acpi_pad_handle_notify(handle); + break; + default: + pr_warn("Unsupported event [0x%x]\n", event); + break; + } +} + +static int 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, acpi_pad_notify, device); + if (ACPI_FAILURE(status)) + return -ENODEV; + + return 0; +} + +static int acpi_pad_remove(struct acpi_device *device, + int type) +{ + mutex_lock(&xen_cpu_lock); + xen_acpi_pad_idle_cpus(0); + mutex_unlock(&xen_cpu_lock); + + acpi_remove_notify_handler(device->handle, + ACPI_DEVICE_NOTIFY, acpi_pad_notify); + return 0; +} + +static const struct acpi_device_id pad_device_ids[] = { + {"ACPI000C", 0}, + {"", 0}, +}; + +static struct acpi_driver acpi_pad_driver = { + .name = "processor_aggregator", + .class = ACPI_PROCESSOR_AGGREGATOR_CLASS, + .ids = pad_device_ids, + .ops = { + .add = acpi_pad_add, + .remove = acpi_pad_remove, + }, +}; + +static int __init xen_acpi_pad_init(void) +{ + /* Only DOM0 is responsible for Xen acpi pad */ + if (!xen_initial_domain()) + return -ENODEV; + + /* Only Xen4.2 or later support Xen acpi pad */ + if (!xen_running_on_version_or_later(4, 2)) + return -ENODEV; + + return acpi_bus_register_driver(&acpi_pad_driver); +} +subsys_initcall(xen_acpi_pad_init); diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h index 4755b5f..5e36932 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 are already occupied at Xen hypervisor side. + */ +#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; }; diff --git a/include/xen/interface/version.h b/include/xen/interface/version.h index 7ff6498..96d8d3d 100644 --- a/include/xen/interface/version.h +++ b/include/xen/interface/version.h @@ -63,4 +63,19 @@ struct xen_feature_info { /* arg == xen_domain_handle_t. */ #define XENVER_guest_handle 8 +/* Check if running on Xen version (major, minor) or later */ +static inline bool +xen_running_on_version_or_later(unsigned int major, unsigned int minor) +{ + unsigned int version; + + if (!xen_domain()) + return false; + + version = HYPERVISOR_xen_version(XENVER_version, NULL); + if ((((version >> 16) == major) && ((version & 0xffff) >= minor)) || + ((version >> 16) > major)) + return true; + return false; +} #endif /* __XEN_PUBLIC_VERSION_H__ */ |
