From patchwork Wed Sep 19 18:54:36 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 185163 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 73BC22C008A for ; Thu, 20 Sep 2012 05:02:09 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757091Ab2ISTBj (ORCPT ); Wed, 19 Sep 2012 15:01:39 -0400 Received: from rcsinet15.oracle.com ([148.87.113.117]:19677 "EHLO rcsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756975Ab2ISSz3 (ORCPT ); Wed, 19 Sep 2012 14:55:29 -0400 Received: from acsinet22.oracle.com (acsinet22.oracle.com [141.146.126.238]) by rcsinet15.oracle.com (Sentrion-MTA-4.2.2/Sentrion-MTA-4.2.2) with ESMTP id q8JItHV5024036 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 19 Sep 2012 18:55:18 GMT Received: from acsmt358.oracle.com (acsmt358.oracle.com [141.146.40.158]) by acsinet22.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id q8JItGo1014505 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 19 Sep 2012 18:55:17 GMT Received: from abhmt109.oracle.com (abhmt109.oracle.com [141.146.116.61]) by acsmt358.oracle.com (8.12.11.20060308/8.12.11) with ESMTP id q8JItGGf029890; Wed, 19 Sep 2012 13:55:16 -0500 Received: from linux-siqj.site (/10.132.126.191) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 19 Sep 2012 11:55:16 -0700 From: Yinghai Lu To: Bjorn Helgaas , Len Brown , Taku Izumi , Jiang Liu , x86 Cc: Andrew Morton , Linus Torvalds , Greg Kroah-Hartman , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Yinghai Lu Subject: [PATCH 22/40] PCI, acpiphp: Separate out hot-add support of pci host bridge Date: Wed, 19 Sep 2012 11:54:36 -0700 Message-Id: <1348080894-23412-23-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.7.7 In-Reply-To: <1348080894-23412-1-git-send-email-yinghai@kernel.org> References: <1348080894-23412-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet22.oracle.com [141.146.126.238] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org It causes confusion. We may only need acpi hp for pci host bridge. Split host bridge hot-add support to pci_root_hp, and keep acpiphp simple. Also remove not used res_lock in the struct. -v2: put back pci_root_hp change in one patch -v3: add pcibios_resource_survey_bus() calling -v4: remove not needed code with remove_bridge -v5: put back support for acpiphp support for slots just on root bus. -v6: change some functions to *_p2p_* to make it more clean. Signed-off-by: Yinghai Lu --- drivers/acpi/Makefile | 1 + drivers/acpi/pci_root_hp.c | 238 ++++++++++++++++++++++++++++++++++++ drivers/pci/hotplug/acpiphp_glue.c | 59 +++------- 3 files changed, 254 insertions(+), 44 deletions(-) create mode 100644 drivers/acpi/pci_root_hp.c diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 47199e2..c9abd4c 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -36,6 +36,7 @@ acpi-y += processor_core.o acpi-y += ec.o acpi-$(CONFIG_ACPI_DOCK) += dock.o acpi-y += pci_root.o pci_link.o pci_irq.o pci_bind.o +acpi-$(CONFIG_HOTPLUG) += pci_root_hp.o acpi-y += power.o acpi-y += event.o acpi-y += sysfs.o diff --git a/drivers/acpi/pci_root_hp.c b/drivers/acpi/pci_root_hp.c new file mode 100644 index 0000000..e07c31b --- /dev/null +++ b/drivers/acpi/pci_root_hp.c @@ -0,0 +1,238 @@ +/* + * Separated from drivers/pci/hotplug/acpiphp_glue.c + * only support root bridge + */ + +#include +#include + +#include +#include +#include +#include +#include + +static LIST_HEAD(acpi_root_bridge_list); +struct acpi_root_bridge { + struct list_head list; + acpi_handle handle; + u32 flags; +}; + +/* bridge flags */ +#define ROOT_BRIDGE_HAS_EJ0 (0x00000002) +#define ROOT_BRIDGE_HAS_PS3 (0x00000080) + +#define ACPI_STA_FUNCTIONING (0x00000008) + +static struct acpi_root_bridge *acpi_root_handle_to_bridge(acpi_handle handle) +{ + struct acpi_root_bridge *bridge; + + list_for_each_entry(bridge, &acpi_root_bridge_list, list) + if (bridge->handle == handle) + return bridge; + + return NULL; +} + +/* allocate and initialize host bridge data structure */ +static void add_acpi_root_bridge(acpi_handle handle) +{ + struct acpi_root_bridge *bridge; + acpi_handle dummy_handle; + acpi_status status; + + /* if the bridge doesn't have _STA, we assume it is always there */ + status = acpi_get_handle(handle, "_STA", &dummy_handle); + if (ACPI_SUCCESS(status)) { + unsigned long long tmp; + + status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); + if (ACPI_FAILURE(status)) { + printk(KERN_DEBUG "%s: _STA evaluation failure\n", + __func__); + return; + } + if ((tmp & ACPI_STA_FUNCTIONING) == 0) + /* don't register this object */ + return; + } + + bridge = kzalloc(sizeof(struct acpi_root_bridge), GFP_KERNEL); + if (!bridge) + return; + + bridge->handle = handle; + + if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &dummy_handle))) + bridge->flags |= ROOT_BRIDGE_HAS_EJ0; + if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &dummy_handle))) + bridge->flags |= ROOT_BRIDGE_HAS_PS3; + + list_add(&bridge->list, &acpi_root_bridge_list); +} + +struct acpi_root_hp_work { + struct work_struct work; + acpi_handle handle; + u32 type; + void *context; +}; + +static void alloc_acpi_root_hp_work(acpi_handle handle, u32 type, + void *context, + void (*func)(struct work_struct *work)) +{ + struct acpi_root_hp_work *hp_work; + int ret; + + hp_work = kmalloc(sizeof(*hp_work), GFP_KERNEL); + if (!hp_work) + return; + + hp_work->handle = handle; + hp_work->type = type; + hp_work->context = context; + + INIT_WORK(&hp_work->work, func); + ret = queue_work(kacpi_hotplug_wq, &hp_work->work); + if (!ret) + kfree(hp_work); +} + +/* Program resources in newly inserted bridge */ +static void acpi_root_configure_bridge(acpi_handle handle) +{ + struct acpi_pci_root *root = acpi_pci_find_root(handle); + + pcibios_resource_survey_bus(root->bus); + pci_assign_unassigned_bus_resources(root->bus); +} + +static void handle_root_bridge_insertion(acpi_handle handle) +{ + struct acpi_device *device, *pdevice; + acpi_handle phandle; + int ret_val; + + acpi_get_parent(handle, &phandle); + if (acpi_bus_get_device(phandle, &pdevice)) { + printk(KERN_DEBUG "no parent device, assuming NULL\n"); + pdevice = NULL; + } + if (!acpi_bus_get_device(handle, &device)) { + /* check if pci root_bus is removed */ + struct acpi_pci_root *root = acpi_driver_data(device); + if (pci_find_bus(root->segment, root->secondary.start)) + return; + + printk(KERN_DEBUG "bus exists... trim\n"); + /* this shouldn't be in here, so remove + * the bus then re-add it... + */ + ret_val = acpi_bus_trim(device, 1); + printk(KERN_DEBUG "acpi_bus_trim return %x\n", ret_val); + } + if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) { + printk(KERN_ERR "cannot add bridge to acpi list\n"); + return; + } + acpi_root_configure_bridge(handle); + if (acpi_bus_start(device)) + printk(KERN_ERR "cannot start bridge\n"); +} + +static void _handle_hotplug_event_root(struct work_struct *work) +{ + struct acpi_root_bridge *bridge; + char objname[64]; + struct acpi_buffer buffer = { .length = sizeof(objname), + .pointer = objname }; + struct acpi_root_hp_work *hp_work; + acpi_handle handle; + u32 type; + + hp_work = container_of(work, struct acpi_root_hp_work, work); + handle = hp_work->handle; + type = hp_work->type; + + bridge = acpi_root_handle_to_bridge(handle); + + acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); + + switch (type) { + case ACPI_NOTIFY_BUS_CHECK: + /* bus enumerate */ + printk(KERN_DEBUG "%s: Bus check notify on %s\n", __func__, + objname); + if (!bridge) { + handle_root_bridge_insertion(handle); + add_acpi_root_bridge(handle); + } + + break; + + case ACPI_NOTIFY_DEVICE_CHECK: + /* device check */ + printk(KERN_DEBUG "%s: Device check notify on %s\n", __func__, + objname); + if (!bridge) { + handle_root_bridge_insertion(handle); + add_acpi_root_bridge(handle); + } + break; + + default: + printk(KERN_WARNING "notify_handler: unknown event type 0x%x for %s\n", + type, objname); + break; + } + + kfree(hp_work); /* allocated in handle_hotplug_event_bridge */ +} + +static void handle_hotplug_event_root(acpi_handle handle, u32 type, + void *context) +{ + alloc_acpi_root_hp_work(handle, type, context, + _handle_hotplug_event_root); +} + +static acpi_status __init +find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) +{ + char objname[64]; + struct acpi_buffer buffer = { .length = sizeof(objname), + .pointer = objname }; + int *count = (int *)context; + + if (!acpi_is_root_bridge(handle)) + return AE_OK; + + (*count)++; + + acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); + + acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + handle_hotplug_event_root, NULL); + printk(KERN_DEBUG "acpi root: %s notify handler installed\n", objname); + + add_acpi_root_bridge(handle); + + return AE_OK; +} + +static int __init acpi_pci_root_hp_init(void) +{ + int num = 0; + + acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, + ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); + + printk(KERN_DEBUG "Found %d acpi root devices\n", num); + + return 0; +} + +subsys_initcall(acpi_pci_root_hp_init); diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 6cb1923..00fa414 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -521,10 +521,13 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge) acpi_status status; acpi_handle handle = bridge->handle; - status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + if (bridge->type != BRIDGE_TYPE_HOST) { + status = acpi_remove_notify_handler(handle, + ACPI_SYSTEM_NOTIFY, handle_hotplug_event_bridge); - if (ACPI_FAILURE(status)) - err("failed to remove notify handler\n"); + if (ACPI_FAILURE(status)) + err("failed to remove notify handler\n"); + } if ((bridge->type != BRIDGE_TYPE_HOST) && ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) { @@ -607,9 +610,6 @@ static void remove_bridge(acpi_handle handle) bridge = acpiphp_handle_to_bridge(handle); if (bridge) cleanup_bridge(bridge); - else - acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_bridge); } static int power_on_slot(struct acpiphp_slot *slot) @@ -1110,18 +1110,12 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus) } /* Program resources in newly inserted bridge */ -static int acpiphp_configure_bridge (acpi_handle handle) +static int acpiphp_configure_p2p_bridge(acpi_handle handle) { - struct pci_bus *bus; + struct pci_dev *pdev = acpi_get_pci_dev(handle); + struct pci_bus *bus = pdev->subordinate; - if (acpi_is_root_bridge(handle)) { - struct acpi_pci_root *root = acpi_pci_find_root(handle); - bus = root->bus; - } else { - struct pci_dev *pdev = acpi_get_pci_dev(handle); - bus = pdev->subordinate; - pci_dev_put(pdev); - } + pci_dev_put(pdev); pci_bus_size_bridges(bus); pci_bus_assign_resources(bus); @@ -1131,7 +1125,7 @@ static int acpiphp_configure_bridge (acpi_handle handle) return 0; } -static void handle_bridge_insertion(acpi_handle handle, u32 type) +static void handle_p2p_bridge_insertion(acpi_handle handle, u32 type) { struct acpi_device *device, *pdevice; acpi_handle phandle; @@ -1151,9 +1145,9 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type) err("cannot add bridge to acpi list\n"); return; } - if (!acpiphp_configure_bridge(handle) && + if (!acpiphp_configure_p2p_bridge(handle) && !acpi_bus_start(device)) - add_bridge(handle); + add_p2p_bridge(handle); else err("cannot configure and start bridge\n"); @@ -1239,7 +1233,7 @@ static void _handle_hotplug_event_bridge(struct work_struct *work) if (acpi_bus_get_device(handle, &device)) { /* This bridge must have just been physically inserted */ - handle_bridge_insertion(handle, type); + handle_p2p_bridge_insertion(handle, type); goto out; } @@ -1416,21 +1410,6 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type, _handle_hotplug_event_func); } -static acpi_status -find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) -{ - int *count = (int *)context; - - if (!acpi_is_root_bridge(handle)) - return AE_OK; - - (*count)++; - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_bridge, NULL); - - return AE_OK ; -} - static struct acpi_pci_driver acpi_pci_hp_driver = { .add = add_bridge, .remove = remove_bridge, @@ -1441,15 +1420,7 @@ static struct acpi_pci_driver acpi_pci_hp_driver = { */ int __init acpiphp_glue_init(void) { - int num = 0; - - acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, - ACPI_UINT32_MAX, find_root_bridges, NULL, &num, NULL); - - if (num <= 0) - return -1; - else - acpi_pci_register_driver(&acpi_pci_hp_driver); + acpi_pci_register_driver(&acpi_pci_hp_driver); return 0; }