/* * 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. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #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_platform_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_platform_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; } static void acpi_pad_handle_notify(acpi_handle handle) { int idle_nums; struct acpi_buffer param = { .length = 4, .pointer = (void *)&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_evaluate_ost(handle, ACPI_PROCESSOR_AGGREGATOR_NOTIFY, 0, ¶m); 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) { 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); /tr>mode:
authorThomas Gleixner <tglx@linutronix.de>2017-01-31 23:58:38 +0100
committerIngo Molnar <mingo@kernel.org>2017-02-01 08:37:27 +0100
commitdd86e373e09fb16b83e8adf5c48c421a4ca76468 (patch)
tree55703c2ea8584e303e342090614e0aab3509ab21 /sound/oss/msnd_pinnacle.h
parent0b3589be9b98994ce3d5aeca52445d1f5627c4ba (diff)
perf/x86/intel/rapl: Make package handling more robust
The package management code in RAPL relies on package mapping being available before a CPU is started. This changed with: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") because the ACPI/BIOS information turned out to be unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/oss/msnd_pinnacle.h')