Attachment 941540 Details for Bug 1145751 – RHEL PATCH 1/6

[patch] RHEL PATCH 1/6

0001-ACPI-hotplug-Add-demand_offline-hotplug-profile-flag.patch (text/plain), 4.29 KB, created by Prarit Bhargava on 2014-09-26 11:29:09 UTC

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Creator: Prarit Bhargava

Created: 2014-09-26 11:29:09 UTC

Size: 4.29 KB

patch

obsolete

>From e6125abad996586950db62de30b2521b53c300c4 Mon Sep 17 00:00:00 2001
>From: Prarit Bhargava <prarit@redhat.com>
>Date: Mon, 15 Sep 2014 10:45:09 -0400
>Subject: [1/6] ACPI / hotplug: Add demand_offline hotplug profile flag
>
>Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1128634
>
>commit d22ddcbc4fb7a483d0721eddfda3f0558821d372
>Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>Date:   Sun Dec 29 15:25:35 2013 +0100
>
>    ACPI / hotplug: Add demand_offline hotplug profile flag
>
>    Add a new ACPI hotplug profile flag, demand_offline, such that if
>    set for the given ACPI device object's scan handler, it will cause
>    acpi_scan_hot_remove() to check if that device object's physical
>    companions are offline upfront and fail the hot removal if that
>    is not the case.
>
>    That flag will be useful to overcome a problem with containers on
>    some system where they can only be hot-removed after some cleanup
>    operations carried out by user space, which needs to be notified
>    of the container hot-removal before the kernel attempts to offline
>    devices in the container.  In those cases the current implementation
>    of acpi_scan_hot_remove() is not sufficient, because it first tries
>    to offline the devices in the container and only if that is
>    suffcessful it tries to offline the container itself.  As a result,
>    the container hot-removal notification is not delivered to user space
>    at the right time.
>
>    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>---
> drivers/acpi/scan.c     |   41 +++++++++++++++++++++++++++++++++++++----
> include/acpi/acpi_bus.h |    3 ++-
> 2 files changed, 39 insertions(+), 5 deletions(-)
>
>diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
>index bc06fa8..4c8b2ee 100644
>--- a/drivers/acpi/scan.c
>+++ b/drivers/acpi/scan.c
>@@ -128,6 +128,24 @@ acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, cha
> }
> static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
> 
>+static bool acpi_scan_is_offline(struct acpi_device *adev)
>+{
>+	struct acpi_device_physical_node *pn;
>+	bool offline = true;
>+
>+	mutex_lock(&adev->physical_node_lock);
>+
>+	list_for_each_entry(pn, &adev->physical_node_list, node)
>+		if (device_supports_offline(pn->dev) && !pn->dev->offline) {
>+			kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
>+			offline = false;
>+			break;
>+		}
>+
>+	mutex_unlock(&adev->physical_node_lock);
>+	return offline;
>+}
>+
> static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
> 				    void **ret_p)
> {
>@@ -198,12 +216,11 @@ static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
> 	return AE_OK;
> }
> 
>-static int acpi_scan_hot_remove(struct acpi_device *device)
>+static int acpi_scan_try_to_offline(struct acpi_device *device)
> {
> 	acpi_handle handle = device->handle;
>-	struct device *errdev;
>+	struct device *errdev = NULL;
> 	acpi_status status;
>-	unsigned long long sta;
> 
> 	/*
> 	 * Carry out two passes here and ignore errors in the first pass,
>@@ -214,7 +231,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
> 	 *
> 	 * If the first pass is successful, the second one isn't needed, though.
> 	 */
>-	errdev = NULL;
> 	status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
> 				     NULL, acpi_bus_offline, (void *)false,
> 				     (void **)&errdev);
>@@ -243,6 +259,23 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
> 			return -EBUSY;
> 		}
> 	}
>+	return 0;
>+}
>+
>+static int acpi_scan_hot_remove(struct acpi_device *device)
>+{
>+	acpi_handle handle = device->handle;
>+	unsigned long long sta;
>+	acpi_status status;
>+
>+	if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
>+		if (!acpi_scan_is_offline(device))
>+			return -EBUSY;
>+	} else {
>+		int error = acpi_scan_try_to_offline(device);
>+		if (error)
>+			return error;
>+	}
> 
> 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
> 		"Hot-removing device %s...\n", dev_name(&device->dev)));
>diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
>index 18e26a4..d983651 100644
>--- a/include/acpi/acpi_bus.h
>+++ b/include/acpi/acpi_bus.h
>@@ -93,8 +93,9 @@ struct acpi_device;
> 
> struct acpi_hotplug_profile {
> 	struct kobject kobj;
>-	bool enabled:1;
> 	int (*scan_dependent)(struct acpi_device *adev);
>+	bool enabled:1;
>+	bool demand_offline:1;
> };
> 
> static inline struct acpi_hotplug_profile *to_acpi_hotplug_profile(
>-- 
>1.7.9.3
>

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Attachments on bug 1145751: 941540 | 941541 | 941542 | 941543 | 941544 | 941545 | 943020 | 943021 | 943022 | 943023 | 943024 | 943025 | 975178 | 975179