Commit 275c58d7 authored by Toshi Kani's avatar Toshi Kani Committed by Len Brown
Browse files

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: default avatarToshi Kani <toshi.kani@hp.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent f8f5701b

drivers/acpi/utils.c

+42 −0
Original line number Diff line number Diff line
@@ -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);

include/acpi/acpi_bus.h

+3 −0
Original line number Diff line number Diff line
@@ -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 */

include/linux/acpi.h

+39 −1
Original line number Diff line number Diff line
@@ -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);

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