ACPI 5.0: Implement hardware-reduced option

If HW-reduced flag is set in the FADT, do not attempt to access
or initialize any ACPI hardware, including SCI and global lock.
No FACS will be present.

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>

6 files changed, 58 insertions, 3 deletions

diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index 76dc02f15574..25912a93dea7 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -140,8 +140,19 @@ u32 acpi_gbl_trace_flags;
 acpi_name acpi_gbl_trace_method_name;
 u8 acpi_gbl_system_awake_and_running;
 
+/*
+ * ACPI 5.0 introduces the concept of a "reduced hardware platform", meaning
+ * that the ACPI hardware is no longer required. A flag in the FADT indicates
+ * a reduced HW machine, and that flag is duplicated here for convenience.
+ */
+u8 acpi_gbl_reduced_hardware;
+
 #endif
 
+/* Do not disassemble buffers to resource descriptors */
+
+ACPI_EXTERN u8 ACPI_INIT_GLOBAL(acpi_gbl_no_resource_disassembly, FALSE);
+
 /*****************************************************************************
  *
  * Debug support
@@ -207,7 +218,7 @@ ACPI_EXTERN struct acpi_rw_lock acpi_gbl_namespace_rw_lock;
 
 /*****************************************************************************
  *
- * Mutual exlusion within ACPICA subsystem
+ * Mutual exclusion within ACPICA subsystem
  *
  ****************************************************************************/
 
diff --git a/drivers/acpi/acpica/evevent.c b/drivers/acpi/acpica/evevent.c
index d458b041e651..1f43be470199 100644
--- a/drivers/acpi/acpica/evevent.c
+++ b/drivers/acpi/acpica/evevent.c
@@ -71,6 +71,12 @@ acpi_status acpi_ev_initialize_events(void)
 
         ACPI_FUNCTION_TRACE(ev_initialize_events);
 
+        /* If Hardware Reduced flag is set, there are no fixed events */
+
+        if (acpi_gbl_reduced_hardware) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
         /*
          * Initialize the Fixed and General Purpose Events. This is done prior to
          * enabling SCIs to prevent interrupts from occurring before the handlers
@@ -111,6 +117,12 @@ acpi_status acpi_ev_install_xrupt_handlers(void)
 
         ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
 
+        /* If Hardware Reduced flag is set, there is no ACPI h/w */
+
+        if (acpi_gbl_reduced_hardware) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
         /* Install the SCI handler */
 
         status = acpi_ev_install_sci_handler();
diff --git a/drivers/acpi/acpica/evglock.c b/drivers/acpi/acpica/evglock.c
index 56a562a1e5d7..af1e71af1b64 100644
--- a/drivers/acpi/acpica/evglock.c
+++ b/drivers/acpi/acpica/evglock.c
@@ -70,6 +70,12 @@ acpi_status acpi_ev_init_global_lock_handler(void)
 
         ACPI_FUNCTION_TRACE(ev_init_global_lock_handler);
 
+        /* If Hardware Reduced flag is set, there is no global lock */
+
+        if (acpi_gbl_reduced_hardware) {
+                return_ACPI_STATUS(AE_OK);
+        }
+
         /* Attempt installation of the global lock handler */
 
         status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL,
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 536fd2bc7a47..1e1a7de34439 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -253,8 +253,13 @@ void acpi_tb_parse_fadt(u32 table_index)
         acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
                               ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
 
-        acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
-                              ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
+        /* If Hardware Reduced flag is set, there is no FACS */
+
+        if (!acpi_gbl_reduced_hardware) {
+                acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.
+                                      Xfacs, ACPI_SIG_FACS,
+                                      ACPI_TABLE_INDEX_FACS);
+        }
 }
 
 /*******************************************************************************
@@ -297,6 +302,13 @@ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
         ACPI_MEMCPY(&acpi_gbl_FADT, table,
                     ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
 
+        /* Take a copy of the Hardware Reduced flag */
+
+        acpi_gbl_reduced_hardware = FALSE;
+        if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
+                acpi_gbl_reduced_hardware = TRUE;
+        }
+
         /* Convert the local copy of the FADT to the common internal format */
 
         acpi_tb_convert_fadt();
@@ -502,6 +514,12 @@ static void acpi_tb_validate_fadt(void)
                 acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
         }
 
+        /* If Hardware Reduced flag is set, we are all done */
+
+        if (acpi_gbl_reduced_hardware) {
+                return;
+        }
+
         /* Examine all of the 64-bit extended address fields (X fields) */
 
         for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 0f2d395feaba..da56a1908966 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -135,6 +135,13 @@ acpi_status acpi_tb_initialize_facs(void)
 {
         acpi_status status;
 
+        /* If Hardware Reduced flag is set, there is no FACS */
+
+        if (acpi_gbl_reduced_hardware) {
+                acpi_gbl_FACS = NULL;
+                return (AE_OK);
+        }
+
         status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
                                          ACPI_CAST_INDIRECT_PTR(struct
                                                                 acpi_table_header,
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index f554a9313b43..9ba2e3aff5c6 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -74,6 +74,7 @@ extern u8 acpi_gbl_disable_auto_repair;
 extern u32 acpi_current_gpe_count;
 extern struct acpi_table_fadt acpi_gbl_FADT;
 extern u8 acpi_gbl_system_awake_and_running;
+extern u8 acpi_gbl_reduced_hardware;    /* ACPI 5.0 */
 
 extern u32 acpi_rsdt_forced;
 /*