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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-05-03 00:26:16 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-05-12 14:14:24 +0200
commit683058e315f00a216fd6c79df4f63bc9945ca434 (patch)
treee4b143220938ebb24a7bf72f286f275090b2afef /Documentation
parent0902a9044fa5b7a0456ea4daacec2c2b3189ba8c (diff)
downloadlinux-683058e315f00a216fd6c79df4f63bc9945ca434.tar.bz2
ACPI / hotplug: Use device offline/online for graceful hot-removal
Modify the generic ACPI hotplug code to be able to check if devices scheduled for hot-removal may be gracefully removed from the system using the device offline/online mechanism introduced previously. Namely, make acpi_scan_hot_remove() handling device hot-removal call device_offline() for all physical companions of the ACPI device nodes involved in the operation and check the results. If any of the device_offline() calls fails, the function will not progress to the removal phase (which cannot be aborted), unless its (new) force argument is set (in case of a failing offline it will put the devices offlined by it back online). In support of 'forced' device hot-removal, add a new sysfs attribute 'force_remove' that will reside under /sys/firmware/acpi/hotplug/. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Toshi Kani <toshi.kani@hp.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-firmware-acpi10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-firmware-acpi b/Documentation/ABI/testing/sysfs-firmware-acpi
index ce9bee98b43b..b4436cca97a8 100644
--- a/Documentation/ABI/testing/sysfs-firmware-acpi
+++ b/Documentation/ABI/testing/sysfs-firmware-acpi
@@ -44,6 +44,16 @@ Description:
or 0 (unset). Attempts to write any other values to it will
cause -EINVAL to be returned.
+What: /sys/firmware/acpi/hotplug/force_remove
+Date: May 2013
+Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+ The number in this file (0 or 1) determines whether (1) or not
+ (0) the ACPI subsystem will allow devices to be hot-removed even
+ if they cannot be put offline gracefully (from the kernel's
+ viewpoint). That number can be changed by writing a boolean
+ value to this file.
+
What: /sys/firmware/acpi/interrupts/
Date: February 2008
Contact: Len Brown <lenb@kernel.org>