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author | Bob Moore <robert.moore@intel.com> | 2012-07-16 10:21:34 +0800 |
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committer | Len Brown <len.brown@intel.com> | 2012-07-17 00:05:50 -0400 |
commit | f60d81813d0e01463e76155c393b75a09dd3bbb4 (patch) | |
tree | aa0d28a3cd2392ede13802281f977b4738252b63 /drivers/acpi/acpica/tbxfload.c | |
parent | d59b8ecd94ee6ab8c663fc187ed6acf8ffdd3b5d (diff) | |
download | linux-f60d81813d0e01463e76155c393b75a09dd3bbb4.tar.gz linux-f60d81813d0e01463e76155c393b75a09dd3bbb4.tar.bz2 linux-f60d81813d0e01463e76155c393b75a09dd3bbb4.zip |
ACPICA: Add new ACPI table load/unload external interfaces
Add acpi_load_table and acpi_unload_parent_table to support
host-directed dynamic table load/unload. Intended to support
hotplug addition and removal of SSDTs.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/tbxfload.c')
-rw-r--r-- | drivers/acpi/acpica/tbxfload.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c index 54a01ae94f8b..f87cc63e69a1 100644 --- a/drivers/acpi/acpica/tbxfload.c +++ b/drivers/acpi/acpica/tbxfload.c @@ -199,6 +199,184 @@ static acpi_status acpi_tb_load_namespace(void) return_ACPI_STATUS(status); } +/******************************************************************************* + * + * FUNCTION: acpi_load_table + * + * PARAMETERS: table - Pointer to a buffer containing the ACPI + * table to be loaded. + * + * RETURN: Status + * + * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must + * be a valid ACPI table with a valid ACPI table header. + * Note1: Mainly intended to support hotplug addition of SSDTs. + * Note2: Does not copy the incoming table. User is reponsible + * to ensure that the table is not deleted or unmapped. + * + ******************************************************************************/ + +acpi_status acpi_load_table(struct acpi_table_header *table) +{ + acpi_status status; + struct acpi_table_desc table_desc; + u32 table_index; + + ACPI_FUNCTION_TRACE(acpi_load_table); + + /* Parameter validation */ + + if (!table) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* Init local table descriptor */ + + ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc)); + table_desc.address = ACPI_PTR_TO_PHYSADDR(table); + table_desc.pointer = table; + table_desc.length = table->length; + table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN; + + /* Must acquire the interpreter lock during this operation */ + + status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Install the table and load it into the namespace */ + + ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); + status = acpi_tb_add_table(&table_desc, &table_index); + if (ACPI_FAILURE(status)) { + goto unlock_and_exit; + } + + status = acpi_ns_load_table(table_index, acpi_gbl_root_node); + + /* Invoke table handler if present */ + + if (acpi_gbl_table_handler) { + (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, + acpi_gbl_table_handler_context); + } + + unlock_and_exit: + (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_load_table) + +/******************************************************************************* + * + * FUNCTION: acpi_unload_parent_table + * + * PARAMETERS: object - Handle to any namespace object owned by + * the table to be unloaded + * + * RETURN: Status + * + * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads + * the table and deletes all namespace objects associated with + * that table. Unloading of the DSDT is not allowed. + * Note: Mainly intended to support hotplug removal of SSDTs. + * + ******************************************************************************/ +acpi_status acpi_unload_parent_table(acpi_handle object) +{ + struct acpi_namespace_node *node = + ACPI_CAST_PTR(struct acpi_namespace_node, object); + acpi_status status = AE_NOT_EXIST; + acpi_owner_id owner_id; + u32 i; + + ACPI_FUNCTION_TRACE(acpi_unload_parent_table); + + /* Parameter validation */ + + if (!object) { + return_ACPI_STATUS(AE_BAD_PARAMETER); + } + + /* + * The node owner_id is currently the same as the parent table ID. + * However, this could change in the future. + */ + owner_id = node->owner_id; + if (!owner_id) { + + /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ + + return_ACPI_STATUS(AE_TYPE); + } + + /* Must acquire the interpreter lock during this operation */ + + status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Find the table in the global table list */ + + for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { + if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { + continue; + } + + /* + * Allow unload of SSDT and OEMx tables only. Do not allow unload + * of the DSDT. No other types of tables should get here, since + * only these types can contain AML and thus are the only types + * that can create namespace objects. + */ + if (ACPI_COMPARE_NAME + (acpi_gbl_root_table_list.tables[i].signature.ascii, + ACPI_SIG_DSDT)) { + status = AE_TYPE; + break; + } + + /* Ensure the table is actually loaded */ + + if (!acpi_tb_is_table_loaded(i)) { + status = AE_NOT_EXIST; + break; + } + + /* Invoke table handler if present */ + + if (acpi_gbl_table_handler) { + (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, + acpi_gbl_root_table_list. + tables[i].pointer, + acpi_gbl_table_handler_context); + } + + /* + * Delete all namespace objects owned by this table. Note that + * these objects can appear anywhere in the namespace by virtue + * of the AML "Scope" operator. Thus, we need to track ownership + * by an ID, not simply a position within the hierarchy. + */ + status = acpi_tb_delete_namespace_by_owner(i); + if (ACPI_FAILURE(status)) { + break; + } + + status = acpi_tb_release_owner_id(i); + acpi_tb_set_table_loaded_flag(i, FALSE); + break; + } + + (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) + static int __init acpi_no_auto_ssdt_setup(char *s) { printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n"); |