ACPICA: Allow to skip Global Lock initialization

commit feb8ae81b2378b75a99c81d315602ac8918ed382 upstream.

Introduce acpi_gbl_use_global_lock, which allows to skip the Global Lock
initialization. This is useful for systems without Global Lock (such as
loong_arch), so as to avoid error messages during boot phase:

 ACPI Error: Could not enable global_lock event (20240827/evxfevnt-182)
 ACPI Error: No response from Global Lock hardware, disabling lock (20240827/evglock-59)

Link: acpica/acpica@463cb0fe
Signed-off-by: Huacai Chen <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: Huacai Chen <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: chenhuacai

drivers/acpi/acpica/evglock.c

@@ -42,6 +42,10 @@ acpi_status acpi_ev_init_global_lock_handler(void)
 		return_ACPI_STATUS(AE_OK);
 	}
 
+	if (!acpi_gbl_use_global_lock) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
 	/* Attempt installation of the global lock handler */
 
 	status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,

include/acpi/acpixf.h

@@ -213,6 +213,12 @@ ACPI_INIT_GLOBAL(u8, acpi_gbl_osi_data, 0);
  */
 ACPI_INIT_GLOBAL(u8, acpi_gbl_reduced_hardware, FALSE);
 
+/*
+ * ACPI Global Lock is mainly used for systems with SMM, so no-SMM systems
+ * (such as loong_arch) may not have and not use Global Lock.
+ */
+ACPI_INIT_GLOBAL(u8, acpi_gbl_use_global_lock, TRUE);
+
 /*
  * Maximum timeout for While() loop iterations before forced method abort.
  * This mechanism is intended to prevent infinite loops during interpreter