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authorToshi Kani <toshi.kani@hp.com>2012-05-24 06:25:19 +0400
committerLen Brown <len.brown@intel.com>2012-06-04 09:09:14 +0400
commit275c58d77062bbb85dbeb3843ba04f34aa50cf8e (patch)
treed347bac51f1d7bb81a49b8abcd9961a4a997311f /drivers/acpi/utils.c
parentf8f5701bdaf9134b1f90e5044a82c66324d2073f (diff)
downloadlinux-275c58d77062bbb85dbeb3843ba04f34aa50cf8e.tar.xz
ACPI: Add an interface to evaluate _OST
Added acpi_evaluate_hotplug_opt(). All ACPI hotplug handlers must call this function when evaluating _OST for hotplug operations. If the platform does not support _OST, this function returns AE_NOT_FOUND and has no effect on the platform. ACPI_HOTPLUG_OST is defined when all relevant ACPI hotplug operations, such as CPU, memory and container hotplug, are enabled. This assures consistent behavior among the hotplug operations with regarding the _OST support. When ACPI_HOTPLUG_OST is not defined, this function is a no-op. ACPI PCI hotplug is not enhanced to support _OST at this time since it is a legacy method being replaced by PCIe native hotplug. _OST support for ACPI PCI hotplug may be added in future if necessary. Some platforms may require the OS to support _OST in order to support ACPI hotplug operations. For example, if a platform has the management console where user can request a hotplug operation from, this _OST support would be required for the management console to show the result of the hotplug request to user. Added macro definitions of _OST source events and status codes. Also renamed OSC_SB_CPUHP_OST_SUPPORT to OSC_SB_HOTPLUG_OST_SUPPORT since this _OSC bit is not specific to CPU hotplug. This bit is defined in Table 6-147 of ACPI 5.0 as follows. Bits: 3 Field Name: Insertion / Ejection _OST Processing Support Definition: This bit is set if OSPM will evaluate the _OST object defined under a device when processing insertion and ejection source event codes. Signed-off-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/utils.c')
-rw-r--r--drivers/acpi/utils.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index adbbc1c80a26..3e87c9c538aa 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -412,3 +412,45 @@ out:
return status;
}
EXPORT_SYMBOL(acpi_get_physical_device_location);
+
+/**
+ * acpi_evaluate_hotplug_ost: Evaluate _OST for hotplug operations
+ * @handle: ACPI device handle
+ * @source_event: source event code
+ * @status_code: status code
+ * @status_buf: optional detailed information (NULL if none)
+ *
+ * Evaluate _OST for hotplug operations. All ACPI hotplug handlers
+ * must call this function when evaluating _OST for hotplug operations.
+ * When the platform does not support _OST, this function has no effect.
+ */
+acpi_status
+acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
+ u32 status_code, struct acpi_buffer *status_buf)
+{
+#ifdef ACPI_HOTPLUG_OST
+ union acpi_object params[3] = {
+ {.type = ACPI_TYPE_INTEGER,},
+ {.type = ACPI_TYPE_INTEGER,},
+ {.type = ACPI_TYPE_BUFFER,}
+ };
+ struct acpi_object_list arg_list = {3, params};
+ acpi_status status;
+
+ params[0].integer.value = source_event;
+ params[1].integer.value = status_code;
+ if (status_buf != NULL) {
+ params[2].buffer.pointer = status_buf->pointer;
+ params[2].buffer.length = status_buf->length;
+ } else {
+ params[2].buffer.pointer = NULL;
+ params[2].buffer.length = 0;
+ }
+
+ status = acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
+ return status;
+#else
+ return AE_OK;
+#endif
+}
+EXPORT_SYMBOL(acpi_evaluate_hotplug_ost);