1 /*******************************************************************************
3 * Module Name: utownerid - Support for Table/Method Owner IDs
5 ******************************************************************************/
8 * Copyright (C) 2000 - 2016, Intel Corp.
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44 #include <contrib/dev/acpica/include/acpi.h>
45 #include <contrib/dev/acpica/include/accommon.h>
46 #include <contrib/dev/acpica/include/acnamesp.h>
49 #define _COMPONENT ACPI_UTILITIES
50 ACPI_MODULE_NAME ("utownerid")
53 /*******************************************************************************
55 * FUNCTION: AcpiUtAllocateOwnerId
57 * PARAMETERS: OwnerId - Where the new owner ID is returned
61 * DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
62 * track objects created by the table or method, to be deleted
63 * when the method exits or the table is unloaded.
65 ******************************************************************************/
68 AcpiUtAllocateOwnerId (
69 ACPI_OWNER_ID *OwnerId)
77 ACPI_FUNCTION_TRACE (UtAllocateOwnerId);
80 /* Guard against multiple allocations of ID to the same location */
85 "Owner ID [0x%2.2X] already exists", *OwnerId));
86 return_ACPI_STATUS (AE_ALREADY_EXISTS);
89 /* Mutex for the global ID mask */
91 Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
92 if (ACPI_FAILURE (Status))
94 return_ACPI_STATUS (Status);
98 * Find a free owner ID, cycle through all possible IDs on repeated
99 * allocations. (ACPI_NUM_OWNERID_MASKS + 1) because first index
100 * may have to be scanned twice.
102 for (i = 0, j = AcpiGbl_LastOwnerIdIndex;
103 i < (ACPI_NUM_OWNERID_MASKS + 1);
106 if (j >= ACPI_NUM_OWNERID_MASKS)
108 j = 0; /* Wraparound to start of mask array */
111 for (k = AcpiGbl_NextOwnerIdOffset; k < 32; k++)
113 if (AcpiGbl_OwnerIdMask[j] == ACPI_UINT32_MAX)
115 /* There are no free IDs in this mask */
120 if (!(AcpiGbl_OwnerIdMask[j] & (1 << k)))
123 * Found a free ID. The actual ID is the bit index plus one,
124 * making zero an invalid Owner ID. Save this as the last ID
125 * allocated and update the global ID mask.
127 AcpiGbl_OwnerIdMask[j] |= (1 << k);
129 AcpiGbl_LastOwnerIdIndex = (UINT8) j;
130 AcpiGbl_NextOwnerIdOffset = (UINT8) (k + 1);
133 * Construct encoded ID from the index and bit position
135 * Note: Last [j].k (bit 255) is never used and is marked
136 * permanently allocated (prevents +1 overflow)
138 *OwnerId = (ACPI_OWNER_ID) ((k + 1) + ACPI_MUL_32 (j));
140 ACPI_DEBUG_PRINT ((ACPI_DB_VALUES,
141 "Allocated OwnerId: %2.2X\n", (unsigned int) *OwnerId));
146 AcpiGbl_NextOwnerIdOffset = 0;
150 * All OwnerIds have been allocated. This typically should
151 * not happen since the IDs are reused after deallocation. The IDs are
152 * allocated upon table load (one per table) and method execution, and
153 * they are released when a table is unloaded or a method completes
156 * If this error happens, there may be very deep nesting of invoked
157 * control methods, or there may be a bug where the IDs are not released.
159 Status = AE_OWNER_ID_LIMIT;
160 ACPI_ERROR ((AE_INFO,
161 "Could not allocate new OwnerId (255 max), AE_OWNER_ID_LIMIT"));
164 (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);
165 return_ACPI_STATUS (Status);
169 /*******************************************************************************
171 * FUNCTION: AcpiUtReleaseOwnerId
173 * PARAMETERS: OwnerIdPtr - Pointer to a previously allocated OwnerID
175 * RETURN: None. No error is returned because we are either exiting a
176 * control method or unloading a table. Either way, we would
177 * ignore any error anyway.
179 * DESCRIPTION: Release a table or method owner ID. Valid IDs are 1 - 255
181 ******************************************************************************/
184 AcpiUtReleaseOwnerId (
185 ACPI_OWNER_ID *OwnerIdPtr)
187 ACPI_OWNER_ID OwnerId = *OwnerIdPtr;
193 ACPI_FUNCTION_TRACE_U32 (UtReleaseOwnerId, OwnerId);
196 /* Always clear the input OwnerId (zero is an invalid ID) */
200 /* Zero is not a valid OwnerID */
204 ACPI_ERROR ((AE_INFO, "Invalid OwnerId: 0x%2.2X", OwnerId));
208 /* Mutex for the global ID mask */
210 Status = AcpiUtAcquireMutex (ACPI_MTX_CACHES);
211 if (ACPI_FAILURE (Status))
216 /* Normalize the ID to zero */
220 /* Decode ID to index/offset pair */
222 Index = ACPI_DIV_32 (OwnerId);
223 Bit = 1 << ACPI_MOD_32 (OwnerId);
225 /* Free the owner ID only if it is valid */
227 if (AcpiGbl_OwnerIdMask[Index] & Bit)
229 AcpiGbl_OwnerIdMask[Index] ^= Bit;
233 ACPI_ERROR ((AE_INFO,
234 "Release of non-allocated OwnerId: 0x%2.2X", OwnerId + 1));
237 (void) AcpiUtReleaseMutex (ACPI_MTX_CACHES);