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alistair23-linux/drivers/acpi/acpica/utdelete.c
Erik Schmauss aa6ec56b57 ACPICA: ACPI 6.3: add PCC operation region support for AML interpreter 
ACPICA commit a4849944e80f97970e99843f4975850753584a4e

This change adds PCC operation region support in the AML interpreter
and a default handler for acpiexec. According to the specification,
the PCC operation region performs a transaction when the COMD field
is written. This allows ASL to write data to other fields before
sending the data.

In order to accommodate this protocol, a temorary buffer is added
to the regionfield object to accumulate writes. If any offset that
spans COMD is written, the temporary buffer is sent to the PCC
operation region handler to be processed.

This change also renames the PCC keyword to platform_comm_channel.

Link: https://github.com/acpica/acpica/commit/a4849944
Reviewed-by: Kyle Pelton <kyle.d.pelton@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-02-24 21:11:20 +01:00

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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: utdelete - object deletion and reference count utilities
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"
#define _COMPONENT ACPI_UTILITIES
ACPI_MODULE_NAME("utdelete")
/* Local prototypes */
static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);
static void
acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);
/*******************************************************************************
*
* FUNCTION: acpi_ut_delete_internal_obj
*
* PARAMETERS: object - Object to be deleted
*
* RETURN: None
*
* DESCRIPTION: Low level object deletion, after reference counts have been
* updated (All reference counts, including sub-objects!)
*
******************************************************************************/
static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
{
void *obj_pointer = NULL;
union acpi_operand_object *handler_desc;
union acpi_operand_object *second_desc;
union acpi_operand_object *next_desc;
union acpi_operand_object *start_desc;
union acpi_operand_object **last_obj_ptr;
ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);
if (!object) {
return_VOID;
}
/*
* Must delete or free any pointers within the object that are not
* actual ACPI objects (for example, a raw buffer pointer).
*/
switch (object->common.type) {
case ACPI_TYPE_STRING:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"**** String %p, ptr %p\n", object,
object->string.pointer));
/* Free the actual string buffer */
if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
/* But only if it is NOT a pointer into an ACPI table */
obj_pointer = object->string.pointer;
}
break;
case ACPI_TYPE_BUFFER:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"**** Buffer %p, ptr %p\n", object,
object->buffer.pointer));
/* Free the actual buffer */
if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
/* But only if it is NOT a pointer into an ACPI table */
obj_pointer = object->buffer.pointer;
}
break;
case ACPI_TYPE_PACKAGE:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
" **** Package of count %X\n",
object->package.count));
/*
* Elements of the package are not handled here, they are deleted
* separately
*/
/* Free the (variable length) element pointer array */
obj_pointer = object->package.elements;
break;
/*
* These objects have a possible list of notify handlers.
* Device object also may have a GPE block.
*/
case ACPI_TYPE_DEVICE:
if (object->device.gpe_block) {
(void)acpi_ev_delete_gpe_block(object->device.
gpe_block);
}
/*lint -fallthrough */
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_THERMAL:
/* Walk the address handler list for this object */
handler_desc = object->common_notify.handler;
while (handler_desc) {
next_desc = handler_desc->address_space.next;
acpi_ut_remove_reference(handler_desc);
handler_desc = next_desc;
}
break;
case ACPI_TYPE_MUTEX:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Mutex %p, OS Mutex %p\n",
object, object->mutex.os_mutex));
if (object == acpi_gbl_global_lock_mutex) {
/* Global Lock has extra semaphore */
(void)
acpi_os_delete_semaphore
(acpi_gbl_global_lock_semaphore);
acpi_gbl_global_lock_semaphore = NULL;
acpi_os_delete_mutex(object->mutex.os_mutex);
acpi_gbl_global_lock_mutex = NULL;
} else {
acpi_ex_unlink_mutex(object);
acpi_os_delete_mutex(object->mutex.os_mutex);
}
break;
case ACPI_TYPE_EVENT:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Event %p, OS Semaphore %p\n",
object, object->event.os_semaphore));
(void)acpi_os_delete_semaphore(object->event.os_semaphore);
object->event.os_semaphore = NULL;
break;
case ACPI_TYPE_METHOD:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Method %p\n", object));
/* Delete the method mutex if it exists */
if (object->method.mutex) {
acpi_os_delete_mutex(object->method.mutex->mutex.
os_mutex);
acpi_ut_delete_object_desc(object->method.mutex);
object->method.mutex = NULL;
}
if (object->method.node) {
object->method.node = NULL;
}
break;
case ACPI_TYPE_REGION:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Region %p\n", object));
/*
* Update address_range list. However, only permanent regions
* are installed in this list. (Not created within a method)
*/
if (!(object->region.node->flags & ANOBJ_TEMPORARY)) {
acpi_ut_remove_address_range(object->region.space_id,
object->region.node);
}
second_desc = acpi_ns_get_secondary_object(object);
if (second_desc) {
/*
* Free the region_context if and only if the handler is one of the
* default handlers -- and therefore, we created the context object
* locally, it was not created by an external caller.
*/
handler_desc = object->region.handler;
if (handler_desc) {
next_desc =
handler_desc->address_space.region_list;
start_desc = next_desc;
last_obj_ptr =
&handler_desc->address_space.region_list;
/* Remove the region object from the handler list */
while (next_desc) {
if (next_desc == object) {
*last_obj_ptr =
next_desc->region.next;
break;
}
/* Walk the linked list of handlers */
last_obj_ptr = &next_desc->region.next;
next_desc = next_desc->region.next;
/* Prevent infinite loop if list is corrupted */
if (next_desc == start_desc) {
ACPI_ERROR((AE_INFO,
"Circular region list in address handler object %p",
handler_desc));
return_VOID;
}
}
if (handler_desc->address_space.handler_flags &
ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
/* Deactivate region and free region context */
if (handler_desc->address_space.setup) {
(void)handler_desc->
address_space.setup(object,
ACPI_REGION_DEACTIVATE,
handler_desc->
address_space.
context,
&second_desc->
extra.
region_context);
}
}
acpi_ut_remove_reference(handler_desc);
}
/* Now we can free the Extra object */
acpi_ut_delete_object_desc(second_desc);
}
if (object->field.internal_pcc_buffer) {
ACPI_FREE(object->field.internal_pcc_buffer);
}
break;
case ACPI_TYPE_BUFFER_FIELD:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Buffer Field %p\n", object));
second_desc = acpi_ns_get_secondary_object(object);
if (second_desc) {
acpi_ut_delete_object_desc(second_desc);
}
break;
case ACPI_TYPE_LOCAL_BANK_FIELD:
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"***** Bank Field %p\n", object));
second_desc = acpi_ns_get_secondary_object(object);
if (second_desc) {
acpi_ut_delete_object_desc(second_desc);
}
break;
default:
break;
}
/* Free any allocated memory (pointer within the object) found above */
if (obj_pointer) {
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"Deleting Object Subptr %p\n", obj_pointer));
ACPI_FREE(obj_pointer);
}
/* Now the object can be safely deleted */
ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS,
"%s: Deleting Object %p [%s]\n",
ACPI_GET_FUNCTION_NAME, object,
acpi_ut_get_object_type_name(object)));
acpi_ut_delete_object_desc(object);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_delete_internal_object_list
*
* PARAMETERS: obj_list - Pointer to the list to be deleted
*
* RETURN: None
*
* DESCRIPTION: This function deletes an internal object list, including both
* simple objects and package objects
*
******************************************************************************/
void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
{
union acpi_operand_object **internal_obj;
ACPI_FUNCTION_ENTRY();
/* Walk the null-terminated internal list */
for (internal_obj = obj_list; *internal_obj; internal_obj++) {
acpi_ut_remove_reference(*internal_obj);
}
/* Free the combined parameter pointer list and object array */
ACPI_FREE(obj_list);
return;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_update_ref_count
*
* PARAMETERS: object - Object whose ref count is to be updated
* action - What to do (REF_INCREMENT or REF_DECREMENT)
*
* RETURN: None. Sets new reference count within the object
*
* DESCRIPTION: Modify the reference count for an internal acpi object
*
******************************************************************************/
static void
acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
{
u16 original_count;
u16 new_count = 0;
acpi_cpu_flags lock_flags;
char *message;
ACPI_FUNCTION_NAME(ut_update_ref_count);
if (!object) {
return;
}
/*
* Always get the reference count lock. Note: Interpreter and/or
* Namespace is not always locked when this function is called.
*/
lock_flags = acpi_os_acquire_lock(acpi_gbl_reference_count_lock);
original_count = object->common.reference_count;
/* Perform the reference count action (increment, decrement) */
switch (action) {
case REF_INCREMENT:
new_count = original_count + 1;
object->common.reference_count = new_count;
acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
/* The current reference count should never be zero here */
if (!original_count) {
ACPI_WARNING((AE_INFO,
"Obj %p, Reference Count was zero before increment\n",
object));
}
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"Obj %p Type %.2X [%s] Refs %.2X [Incremented]\n",
object, object->common.type,
acpi_ut_get_object_type_name(object),
new_count));
message = "Incremement";
break;
case REF_DECREMENT:
/* The current reference count must be non-zero */
if (original_count) {
new_count = original_count - 1;
object->common.reference_count = new_count;
}
acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
if (!original_count) {
ACPI_WARNING((AE_INFO,
"Obj %p, Reference Count is already zero, cannot decrement\n",
object));
}
ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS,
"%s: Obj %p Type %.2X Refs %.2X [Decremented]\n",
ACPI_GET_FUNCTION_NAME, object,
object->common.type, new_count));
/* Actually delete the object on a reference count of zero */
if (new_count == 0) {
acpi_ut_delete_internal_obj(object);
}
message = "Decrement";
break;
default:
acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags);
ACPI_ERROR((AE_INFO, "Unknown Reference Count action (0x%X)",
action));
return;
}
/*
* Sanity check the reference count, for debug purposes only.
* (A deleted object will have a huge reference count)
*/
if (new_count > ACPI_MAX_REFERENCE_COUNT) {
ACPI_WARNING((AE_INFO,
"Large Reference Count (0x%X) in object %p, Type=0x%.2X Operation=%s",
new_count, object, object->common.type, message));
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_update_object_reference
*
* PARAMETERS: object - Increment ref count for this object
* and all sub-objects
* action - Either REF_INCREMENT or REF_DECREMENT
*
* RETURN: Status
*
* DESCRIPTION: Increment the object reference count
*
* Object references are incremented when:
* 1) An object is attached to a Node (namespace object)
* 2) An object is copied (all subobjects must be incremented)
*
* Object references are decremented when:
* 1) An object is detached from an Node
*
******************************************************************************/
acpi_status
acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
{
acpi_status status = AE_OK;
union acpi_generic_state *state_list = NULL;
union acpi_operand_object *next_object = NULL;
union acpi_operand_object *prev_object;
union acpi_generic_state *state;
u32 i;
ACPI_FUNCTION_NAME(ut_update_object_reference);
while (object) {
/* Make sure that this isn't a namespace handle */
if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"Object %p is NS handle\n", object));
return (AE_OK);
}
/*
* All sub-objects must have their reference count incremented
* also. Different object types have different subobjects.
*/
switch (object->common.type) {
case ACPI_TYPE_DEVICE:
case ACPI_TYPE_PROCESSOR:
case ACPI_TYPE_POWER:
case ACPI_TYPE_THERMAL:
/*
* Update the notify objects for these types (if present)
* Two lists, system and device notify handlers.
*/
for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
prev_object =
object->common_notify.notify_list[i];
while (prev_object) {
next_object =
prev_object->notify.next[i];
acpi_ut_update_ref_count(prev_object,
action);
prev_object = next_object;
}
}
break;
case ACPI_TYPE_PACKAGE:
/*
* We must update all the sub-objects of the package,
* each of whom may have their own sub-objects.
*/
for (i = 0; i < object->package.count; i++) {
/*
* Null package elements are legal and can be simply
* ignored.
*/
next_object = object->package.elements[i];
if (!next_object) {
continue;
}
switch (next_object->common.type) {
case ACPI_TYPE_INTEGER:
case ACPI_TYPE_STRING:
case ACPI_TYPE_BUFFER:
/*
* For these very simple sub-objects, we can just
* update the reference count here and continue.
* Greatly increases performance of this operation.
*/
acpi_ut_update_ref_count(next_object,
action);
break;
default:
/*
* For complex sub-objects, push them onto the stack
* for later processing (this eliminates recursion.)
*/
status =
acpi_ut_create_update_state_and_push
(next_object, action, &state_list);
if (ACPI_FAILURE(status)) {
goto error_exit;
}
break;
}
}
next_object = NULL;
break;
case ACPI_TYPE_BUFFER_FIELD:
next_object = object->buffer_field.buffer_obj;
break;
case ACPI_TYPE_LOCAL_REGION_FIELD:
next_object = object->field.region_obj;
break;
case ACPI_TYPE_LOCAL_BANK_FIELD:
next_object = object->bank_field.bank_obj;
status =
acpi_ut_create_update_state_and_push(object->
bank_field.
region_obj,
action,
&state_list);
if (ACPI_FAILURE(status)) {
goto error_exit;
}
break;
case ACPI_TYPE_LOCAL_INDEX_FIELD:
next_object = object->index_field.index_obj;
status =
acpi_ut_create_update_state_and_push(object->
index_field.
data_obj,
action,
&state_list);
if (ACPI_FAILURE(status)) {
goto error_exit;
}
break;
case ACPI_TYPE_LOCAL_REFERENCE:
/*
* The target of an Index (a package, string, or buffer) or a named
* reference must track changes to the ref count of the index or
* target object.
*/
if ((object->reference.class == ACPI_REFCLASS_INDEX) ||
(object->reference.class == ACPI_REFCLASS_NAME)) {
next_object = object->reference.object;
}
break;
case ACPI_TYPE_REGION:
default:
break; /* No subobjects for all other types */
}
/*
* Now we can update the count in the main object. This can only
* happen after we update the sub-objects in case this causes the
* main object to be deleted.
*/
acpi_ut_update_ref_count(object, action);
object = NULL;
/* Move on to the next object to be updated */
if (next_object) {
object = next_object;
next_object = NULL;
} else if (state_list) {
state = acpi_ut_pop_generic_state(&state_list);
object = state->update.object;
acpi_ut_delete_generic_state(state);
}
}
return (AE_OK);
error_exit:
ACPI_EXCEPTION((AE_INFO, status,
"Could not update object reference count"));
/* Free any stacked Update State objects */
while (state_list) {
state = acpi_ut_pop_generic_state(&state_list);
acpi_ut_delete_generic_state(state);
}
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_add_reference
*
* PARAMETERS: object - Object whose reference count is to be
* incremented
*
* RETURN: None
*
* DESCRIPTION: Add one reference to an ACPI object
*
******************************************************************************/
void acpi_ut_add_reference(union acpi_operand_object *object)
{
ACPI_FUNCTION_NAME(ut_add_reference);
/* Ensure that we have a valid object */
if (!acpi_ut_valid_internal_object(object)) {
return;
}
ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
"Obj %p Current Refs=%X [To Be Incremented]\n",
object, object->common.reference_count));
/* Increment the reference count */
(void)acpi_ut_update_object_reference(object, REF_INCREMENT);
return;
}
/*******************************************************************************
*
* FUNCTION: acpi_ut_remove_reference
*
* PARAMETERS: object - Object whose ref count will be decremented
*
* RETURN: None
*
* DESCRIPTION: Decrement the reference count of an ACPI internal object
*
******************************************************************************/
void acpi_ut_remove_reference(union acpi_operand_object *object)
{
ACPI_FUNCTION_NAME(ut_remove_reference);
/*
* Allow a NULL pointer to be passed in, just ignore it. This saves
* each caller from having to check. Also, ignore NS nodes.
*/
if (!object ||
(ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
return;
}
/* Ensure that we have a valid object */
if (!acpi_ut_valid_internal_object(object)) {
return;
}
ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS,
"%s: Obj %p Current Refs=%X [To Be Decremented]\n",
ACPI_GET_FUNCTION_NAME, object,
object->common.reference_count));
/*
* Decrement the reference count, and only actually delete the object
* if the reference count becomes 0. (Must also decrement the ref count
* of all subobjects!)
*/
(void)acpi_ut_update_object_reference(object, REF_DECREMENT);
return;
}
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