219 lines
6.7 KiB
C
219 lines
6.7 KiB
C
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* Module Name: utownerid - Support for Table/Method Owner IDs
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2000 - 2016, Intel Corp.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions, and the following disclaimer,
|
||
|
|
* without modification.
|
||
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
||
|
|
* substantially similar to the "NO WARRANTY" disclaimer below
|
||
|
|
* ("Disclaimer") and any redistribution must be conditioned upon
|
||
|
|
* including a substantially similar Disclaimer requirement for further
|
||
|
|
* binary redistribution.
|
||
|
|
* 3. Neither the names of the above-listed copyright holders nor the names
|
||
|
|
* of any contributors may be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* Alternatively, this software may be distributed under the terms of the
|
||
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
||
|
|
* Software Foundation.
|
||
|
|
*
|
||
|
|
* NO WARRANTY
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
|
||
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||
|
|
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
||
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGES.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <acpi/acpi.h>
|
||
|
|
#include "accommon.h"
|
||
|
|
#include "acnamesp.h"
|
||
|
|
|
||
|
|
#define _COMPONENT ACPI_UTILITIES
|
||
|
|
ACPI_MODULE_NAME("utownerid")
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ut_allocate_owner_id
|
||
|
|
*
|
||
|
|
* PARAMETERS: owner_id - Where the new owner ID is returned
|
||
|
|
*
|
||
|
|
* RETURN: Status
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
|
||
|
|
* track objects created by the table or method, to be deleted
|
||
|
|
* when the method exits or the table is unloaded.
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
acpi_status acpi_ut_allocate_owner_id(acpi_owner_id *owner_id)
|
||
|
|
{
|
||
|
|
u32 i;
|
||
|
|
u32 j;
|
||
|
|
u32 k;
|
||
|
|
acpi_status status;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE(ut_allocate_owner_id);
|
||
|
|
|
||
|
|
/* Guard against multiple allocations of ID to the same location */
|
||
|
|
|
||
|
|
if (*owner_id) {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Owner ID [0x%2.2X] already exists", *owner_id));
|
||
|
|
return_ACPI_STATUS(AE_ALREADY_EXISTS);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Mutex for the global ID mask */
|
||
|
|
|
||
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Find a free owner ID, cycle through all possible IDs on repeated
|
||
|
|
* allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index
|
||
|
|
* may have to be scanned twice.
|
||
|
|
*/
|
||
|
|
for (i = 0, j = acpi_gbl_last_owner_id_index;
|
||
|
|
i < (ACPI_NUM_OWNERID_MASKS + 1); i++, j++) {
|
||
|
|
if (j >= ACPI_NUM_OWNERID_MASKS) {
|
||
|
|
j = 0; /* Wraparound to start of mask array */
|
||
|
|
}
|
||
|
|
|
||
|
|
for (k = acpi_gbl_next_owner_id_offset; k < 32; k++) {
|
||
|
|
if (acpi_gbl_owner_id_mask[j] == ACPI_UINT32_MAX) {
|
||
|
|
|
||
|
|
/* There are no free IDs in this mask */
|
||
|
|
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!(acpi_gbl_owner_id_mask[j] & (1 << k))) {
|
||
|
|
/*
|
||
|
|
* Found a free ID. The actual ID is the bit index plus one,
|
||
|
|
* making zero an invalid Owner ID. Save this as the last ID
|
||
|
|
* allocated and update the global ID mask.
|
||
|
|
*/
|
||
|
|
acpi_gbl_owner_id_mask[j] |= (1 << k);
|
||
|
|
|
||
|
|
acpi_gbl_last_owner_id_index = (u8)j;
|
||
|
|
acpi_gbl_next_owner_id_offset = (u8)(k + 1);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Construct encoded ID from the index and bit position
|
||
|
|
*
|
||
|
|
* Note: Last [j].k (bit 255) is never used and is marked
|
||
|
|
* permanently allocated (prevents +1 overflow)
|
||
|
|
*/
|
||
|
|
*owner_id =
|
||
|
|
(acpi_owner_id)((k + 1) + ACPI_MUL_32(j));
|
||
|
|
|
||
|
|
ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
|
||
|
|
"Allocated OwnerId: %2.2X\n",
|
||
|
|
(unsigned int)*owner_id));
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
acpi_gbl_next_owner_id_offset = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* All owner_ids have been allocated. This typically should
|
||
|
|
* not happen since the IDs are reused after deallocation. The IDs are
|
||
|
|
* allocated upon table load (one per table) and method execution, and
|
||
|
|
* they are released when a table is unloaded or a method completes
|
||
|
|
* execution.
|
||
|
|
*
|
||
|
|
* If this error happens, there may be very deep nesting of invoked
|
||
|
|
* control methods, or there may be a bug where the IDs are not released.
|
||
|
|
*/
|
||
|
|
status = AE_OWNER_ID_LIMIT;
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
|
||
|
|
|
||
|
|
exit:
|
||
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* FUNCTION: acpi_ut_release_owner_id
|
||
|
|
*
|
||
|
|
* PARAMETERS: owner_id_ptr - Pointer to a previously allocated owner_ID
|
||
|
|
*
|
||
|
|
* RETURN: None. No error is returned because we are either exiting a
|
||
|
|
* control method or unloading a table. Either way, we would
|
||
|
|
* ignore any error anyway.
|
||
|
|
*
|
||
|
|
* DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
void acpi_ut_release_owner_id(acpi_owner_id *owner_id_ptr)
|
||
|
|
{
|
||
|
|
acpi_owner_id owner_id = *owner_id_ptr;
|
||
|
|
acpi_status status;
|
||
|
|
u32 index;
|
||
|
|
u32 bit;
|
||
|
|
|
||
|
|
ACPI_FUNCTION_TRACE_U32(ut_release_owner_id, owner_id);
|
||
|
|
|
||
|
|
/* Always clear the input owner_id (zero is an invalid ID) */
|
||
|
|
|
||
|
|
*owner_id_ptr = 0;
|
||
|
|
|
||
|
|
/* Zero is not a valid owner_ID */
|
||
|
|
|
||
|
|
if (owner_id == 0) {
|
||
|
|
ACPI_ERROR((AE_INFO, "Invalid OwnerId: 0x%2.2X", owner_id));
|
||
|
|
return_VOID;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Mutex for the global ID mask */
|
||
|
|
|
||
|
|
status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
return_VOID;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Normalize the ID to zero */
|
||
|
|
|
||
|
|
owner_id--;
|
||
|
|
|
||
|
|
/* Decode ID to index/offset pair */
|
||
|
|
|
||
|
|
index = ACPI_DIV_32(owner_id);
|
||
|
|
bit = 1 << ACPI_MOD_32(owner_id);
|
||
|
|
|
||
|
|
/* Free the owner ID only if it is valid */
|
||
|
|
|
||
|
|
if (acpi_gbl_owner_id_mask[index] & bit) {
|
||
|
|
acpi_gbl_owner_id_mask[index] ^= bit;
|
||
|
|
} else {
|
||
|
|
ACPI_ERROR((AE_INFO,
|
||
|
|
"Release of non-allocated OwnerId: 0x%2.2X",
|
||
|
|
owner_id + 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
|
||
|
|
return_VOID;
|
||
|
|
}
|