Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757190Ab2KCQIa (ORCPT ); Sat, 3 Nov 2012 12:08:30 -0400 Received: from mail-da0-f46.google.com ([209.85.210.46]:53387 "EHLO mail-da0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757128Ab2KCQIX (ORCPT ); Sat, 3 Nov 2012 12:08:23 -0400 From: Jiang Liu To: "Rafael J . Wysocki" , Yinghai Lu , Tony Luck , Yasuaki Ishimatsu , Wen Congyang , Tang Chen , Taku Izumi , Bjorn Helgaas Cc: Jiang Liu , Kenji Kaneshige , Huang Ying , Bob Moore , Len Brown , "Srivatsa S . Bhat" , Yijing Wang , Hanjun Guo , Jiang Liu , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, Gaohuai Han Subject: [ACPIHP PATCH part1 3/4] ACPIHP: detect ACPI hotplug slots by checking ACPI _EJ0 method Date: Sun, 4 Nov 2012 00:07:44 +0800 Message-Id: <1351958865-24394-4-git-send-email-jiang.liu@huawei.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1351958865-24394-1-git-send-email-jiang.liu@huawei.com> References: <1351958865-24394-1-git-send-email-jiang.liu@huawei.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6428 Lines: 208 This patch implements a default mechanism to detect and manage ACPI system device hotplug slots based on standard ACPI interfaces. 1) Detech hotplug slot by checking existence of _EJ0 and _STA methods. 2) Power off a slot by evaluating _EJ0 method. It's the default hotplug slot enumerating mechanism, platform specifc drivers may provide advanced implementation to override the default implementation. Signed-off-by: Jiang Liu Signed-off-by: Gaohuai Han --- drivers/acpi/hotplug/Makefile | 1 + drivers/acpi/hotplug/acpihp.h | 1 + drivers/acpi/hotplug/slot.c | 1 + drivers/acpi/hotplug/slot_ej0.c | 143 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 146 insertions(+) create mode 100644 drivers/acpi/hotplug/slot_ej0.c diff --git a/drivers/acpi/hotplug/Makefile b/drivers/acpi/hotplug/Makefile index 2cbb03c..5420ae7 100644 --- a/drivers/acpi/hotplug/Makefile +++ b/drivers/acpi/hotplug/Makefile @@ -7,3 +7,4 @@ acpihp-y = core.o obj-$(CONFIG_ACPI_HOTPLUG_SLOT) += acpihp_slot.o acpihp_slot-y = slot.o +acpihp_slot-y += slot_ej0.o diff --git a/drivers/acpi/hotplug/acpihp.h b/drivers/acpi/hotplug/acpihp.h index 7467895..278c8c2 100644 --- a/drivers/acpi/hotplug/acpihp.h +++ b/drivers/acpi/hotplug/acpihp.h @@ -28,5 +28,6 @@ #include extern struct acpi_device *acpi_root; +extern struct acpihp_slot_ops acpihp_slot_ej0; #endif diff --git a/drivers/acpi/hotplug/slot.c b/drivers/acpi/hotplug/slot.c index b76cb16..e5861fc 100644 --- a/drivers/acpi/hotplug/slot.c +++ b/drivers/acpi/hotplug/slot.c @@ -43,6 +43,7 @@ static struct acpihp_slot_ops *slot_ops_curr; * The first entry whose init() method returns success will be used. */ static struct acpihp_slot_ops *slot_ops_array[] = { + &acpihp_slot_ej0, NULL }; diff --git a/drivers/acpi/hotplug/slot_ej0.c b/drivers/acpi/hotplug/slot_ej0.c new file mode 100644 index 0000000..fa987dc --- /dev/null +++ b/drivers/acpi/hotplug/slot_ej0.c @@ -0,0 +1,143 @@ +/* + * Copyright (C) 2012 Huawei Tech. Co., Ltd. + * Copyright (C) 2012 Gaohuai Han + * Copyright (C) 2012 Jiang Liu + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that 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. + * + * You should have received a copy of the GNU General Public License along + * with this program. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#include +#include +#include + +static acpi_status acpihp_slot_ej0_capable(acpi_handle handle) +{ + acpi_handle tmp; + + /* Assume a device object with _EJ0 and _STA is a hotplug slot. */ + if (ACPI_FAILURE(acpi_get_handle(handle, "_EJ0", &tmp))) + return AE_ERROR; + if (ACPI_FAILURE(acpi_get_handle(handle, METHOD_NAME__STA, &tmp))) + return AE_ERROR; + + return AE_OK; +} + +static acpi_status +acpihp_slot_ej0_check(acpi_handle handle, u32 lvl, void *context, void **rv) +{ + acpi_status rc = AE_OK; + enum acpihp_dev_type type; + + if (!acpihp_dev_get_type(handle, &type)) { + switch (type) { + case ACPIHP_DEV_TYPE_CPU: + case ACPIHP_DEV_TYPE_MEM: + case ACPIHP_DEV_TYPE_HOST_BRIDGE: + case ACPIHP_DEV_TYPE_CONTAINER: + if (ACPI_SUCCESS(acpihp_slot_ej0_capable(handle))) { + *(int *)rv = 1; + rc = AE_CTRL_TERMINATE; + } else if (type == ACPIHP_DEV_TYPE_HOST_BRIDGE) { + rc = AE_CTRL_DEPTH; + } + break; + default: + break; + } + } + + return rc; +} + +static acpi_status acpihp_slot_ej0_init(void) +{ + int cap = 0; + + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + ACPI_UINT32_MAX, acpihp_slot_ej0_check, + NULL, NULL, (void **)&cap); + acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, + ACPI_UINT32_MAX, acpihp_slot_ej0_check, + NULL, NULL, (void **)&cap); + + return cap ? AE_OK : AE_ERROR; +} + +static acpi_status acpihp_slot_ej0_create(struct acpihp_slot *slot) +{ + /* + * Assume device objects with _EJ0 are capable of: + * ONLINE, OFFLINE, POWEROFF, HOTPLUG + */ + slot->capabilities = ACPIHP_SLOT_CAP_ONLINE | ACPIHP_SLOT_CAP_OFFLINE | + ACPIHP_SLOT_CAP_POWEROFF | ACPIHP_SLOT_CAP_HOTPLUG; + + return AE_OK; +} + +static acpi_status acpihp_slot_ej0_poweroff(struct acpihp_slot *slot) +{ + acpi_status status; + unsigned long long sta; + union acpi_object arg; + struct acpi_object_list arg_list; + acpi_handle handle = slot->handle; + acpi_handle dummy_handle; + + if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &dummy_handle))) { + status = acpi_evaluate_object(handle, "_PS3", NULL, NULL); + if (ACPI_FAILURE(status)) { + ACPIHP_SLOT_DEBUG(slot, "fails to evaluate _PS3.\n"); + return status; + } + } + + arg_list.count = 1; + arg_list.pointer = &arg; + arg.type = ACPI_TYPE_INTEGER; + arg.integer.value = 1; + status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); + if (ACPI_FAILURE(status)) { + ACPIHP_SLOT_WARN(slot, "fails to power off.\n"); + return status; + } + + status = acpi_evaluate_integer(handle, METHOD_NAME__STA, NULL, &sta); + if (ACPI_FAILURE(status)) { + ACPIHP_SLOT_WARN(slot, "fails to evaluate _STA method\n"); + return status; + } + + if (sta & (ACPI_STA_DEVICE_FUNCTIONING | ACPI_STA_DEVICE_ENABLED)) { + ACPIHP_SLOT_WARN(slot, + "object is still active after executing _EJ0.\n"); + return AE_ERROR; + } + + return AE_OK; +} + +struct acpihp_slot_ops acpihp_slot_ej0 = { + .owner = THIS_MODULE, + .desc = "Control Hotplug Slots by ACPI _EJ0 Method", + .init = acpihp_slot_ej0_init, + .check = acpihp_slot_ej0_capable, + .create = acpihp_slot_ej0_create, + .poweroff = acpihp_slot_ej0_poweroff, +}; -- 1.7.9.5 -- 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/