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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>
hifive-unleashed-5.1
Toshi Kani 2012-05-23 20:25:19 -06:00 committed by Len Brown
parent f8f5701bda
commit 275c58d770
3 changed files with 84 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/acpi/utils.c
View File

@ -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);

3
include/acpi/acpi_bus.h
View File

@ -50,6 +50,9 @@ acpi_evaluate_reference(acpi_handle handle,
acpi_string pathname,
struct acpi_object_list *arguments,
struct acpi_handle_list *list);
acpi_status
acpi_evaluate_hotplug_ost(acpi_handle handle, u32 source_event,
u32 status_code, struct acpi_buffer *status_buf);
struct acpi_pld {
unsigned int revision:7; /* 0 */

40
include/linux/acpi.h
View File

@ -277,7 +277,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
#define OSC_SB_PAD_SUPPORT 1
#define OSC_SB_PPC_OST_SUPPORT 2
#define OSC_SB_PR3_SUPPORT 4
#define OSC_SB_CPUHP_OST_SUPPORT 8
#define OSC_SB_HOTPLUG_OST_SUPPORT 8
#define OSC_SB_APEI_SUPPORT 16
extern bool osc_sb_apei_support_acked;
@ -309,6 +309,44 @@ extern bool osc_sb_apei_support_acked;
extern acpi_status acpi_pci_osc_control_set(acpi_handle handle,
u32 *mask, u32 req);
/* Enable _OST when all relevant hotplug operations are enabled */
#if defined(CONFIG_ACPI_HOTPLUG_CPU) && \
(defined(CONFIG_ACPI_HOTPLUG_MEMORY) || \
defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)) && \
(defined(CONFIG_ACPI_CONTAINER) || \
defined(CONFIG_ACPI_CONTAINER_MODULE))
#define ACPI_HOTPLUG_OST
#endif
/* _OST Source Event Code (OSPM Action) */
#define ACPI_OST_EC_OSPM_SHUTDOWN 0x100
#define ACPI_OST_EC_OSPM_EJECT 0x103
#define ACPI_OST_EC_OSPM_INSERTION 0x200
/* _OST General Processing Status Code */
#define ACPI_OST_SC_SUCCESS 0x0
#define ACPI_OST_SC_NON_SPECIFIC_FAILURE 0x1
#define ACPI_OST_SC_UNRECOGNIZED_NOTIFY 0x2
/* _OST OS Shutdown Processing (0x100) Status Code */
#define ACPI_OST_SC_OS_SHUTDOWN_DENIED 0x80
#define ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS 0x81
#define ACPI_OST_SC_OS_SHUTDOWN_COMPLETED 0x82
#define ACPI_OST_SC_OS_SHUTDOWN_NOT_SUPPORTED 0x83
/* _OST Ejection Request (0x3, 0x103) Status Code */
#define ACPI_OST_SC_EJECT_NOT_SUPPORTED 0x80
#define ACPI_OST_SC_DEVICE_IN_USE 0x81
#define ACPI_OST_SC_DEVICE_BUSY 0x82
#define ACPI_OST_SC_EJECT_DEPENDENCY_BUSY 0x83
#define ACPI_OST_SC_EJECT_IN_PROGRESS 0x84
/* _OST Insertion Request (0x200) Status Code */
#define ACPI_OST_SC_INSERT_IN_PROGRESS 0x80
#define ACPI_OST_SC_DRIVER_LOAD_FAILURE 0x81
#define ACPI_OST_SC_INSERT_NOT_SUPPORTED 0x82
extern void acpi_early_init(void);
extern int acpi_nvs_register(__u64 start, __u64 size);