9 files changed, 236 insertions, 20 deletions

diff --git a/drivers/acpi/acpica/acdebug.h b/drivers/acpi/acpica/acdebug.h
index 9feba08c29fe..30c2d6911386 100644
--- a/drivers/acpi/acpica/acdebug.h
+++ b/drivers/acpi/acpica/acdebug.h
@@ -113,11 +113,12 @@ void acpi_db_display_handlers(void);
 ACPI_HW_DEPENDENT_RETURN_VOID(void
                               acpi_db_generate_gpe(char *gpe_arg,
                                                    char *block_arg))
+ ACPI_HW_DEPENDENT_RETURN_VOID(void acpi_db_generate_sci(void))
 
 /*
  * dbconvert - miscellaneous conversion routines
  */
- acpi_status acpi_db_hex_char_to_value(int hex_char, u8 *return_value);
+acpi_status acpi_db_hex_char_to_value(int hex_char, u8 *return_value);
 
 acpi_status acpi_db_convert_to_package(char *string, union acpi_object *object);
 
diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index ab0e97710381..3ae5fd02ae64 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -242,11 +242,11 @@ acpi_ev_initialize_region(union acpi_operand_object *region_obj,
  */
 u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context);
 
-u32 acpi_ev_install_sci_handler(void);
+u32 acpi_ev_sci_dispatch(void);
 
-acpi_status acpi_ev_remove_sci_handler(void);
+u32 acpi_ev_install_sci_handler(void);
 
-u32 acpi_ev_initialize_SCI(u32 program_SCI);
+acpi_status acpi_ev_remove_all_sci_handlers(void);
 
 ACPI_HW_DEPENDENT_RETURN_VOID(void acpi_ev_terminate(void))
 #endif                          /* __ACEVENTS_H__  */
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index c9ad2e1f1ee1..0fba431f4fcb 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -269,6 +269,7 @@ ACPI_EXTERN acpi_table_handler acpi_gbl_table_handler;
 ACPI_EXTERN void *acpi_gbl_table_handler_context;
 ACPI_EXTERN struct acpi_walk_state *acpi_gbl_breakpoint_walk;
 ACPI_EXTERN acpi_interface_handler acpi_gbl_interface_handler;
+ACPI_EXTERN struct acpi_sci_handler_info *acpi_gbl_sci_handler_list;
 
 /* Owner ID support */
 
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index 0ed00669cd21..be9e30ee6048 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -398,6 +398,14 @@ struct acpi_simple_repair_info {
  *
  ****************************************************************************/
 
+/* Dispatch info for each host-installed SCI handler */
+
+struct acpi_sci_handler_info {
+        struct acpi_sci_handler_info *next;
+        acpi_sci_handler address;       /* Address of handler */
+        void *context;          /* Context to be passed to handler */
+};
+
 /* Dispatch info for each GPE -- either a method or handler, cannot be both */
 
 struct acpi_gpe_handler_info {
diff --git a/drivers/acpi/acpica/evgpeutil.c b/drivers/acpi/acpica/evgpeutil.c
index b24dbb80fab8..d52339090b60 100644
--- a/drivers/acpi/acpica/evgpeutil.c
+++ b/drivers/acpi/acpica/evgpeutil.c
@@ -196,7 +196,7 @@ acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
  *
  * FUNCTION:    acpi_ev_get_gpe_xrupt_block
  *
- * PARAMETERS:  interrupt_number     - Interrupt for a GPE block
+ * PARAMETERS:  interrupt_number            - Interrupt for a GPE block
  *
  * RETURN:      A GPE interrupt block
  *
diff --git a/drivers/acpi/acpica/evmisc.c b/drivers/acpi/acpica/evmisc.c
index 1b111ef74903..a5687540e9a6 100644
--- a/drivers/acpi/acpica/evmisc.c
+++ b/drivers/acpi/acpica/evmisc.c
@@ -264,13 +264,6 @@ void acpi_ev_terminate(void)
 
                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
 
-                /* Remove SCI handler */
-
-                status = acpi_ev_remove_sci_handler();
-                if (ACPI_FAILURE(status)) {
-                        ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
-                }
-
                 status = acpi_ev_remove_global_lock_handler();
                 if (ACPI_FAILURE(status)) {
                         ACPI_ERROR((AE_INFO,
@@ -280,6 +273,13 @@ void acpi_ev_terminate(void)
                 acpi_gbl_events_initialized = FALSE;
         }
 
+        /* Remove SCI handlers */
+
+        status = acpi_ev_remove_all_sci_handlers();
+        if (ACPI_FAILURE(status)) {
+                ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
+        }
+
         /* Deallocate all handler objects installed within GPE info structs */
 
         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
diff --git a/drivers/acpi/acpica/evsci.c b/drivers/acpi/acpica/evsci.c
index b905acf7aacd..b2f0fb2f57b4 100644
--- a/drivers/acpi/acpica/evsci.c
+++ b/drivers/acpi/acpica/evsci.c
@@ -54,6 +54,52 @@ static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context);
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ev_sci_dispatch
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status code indicates whether interrupt was handled.
+ *
+ * DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
+ *
+ ******************************************************************************/
+
+u32 acpi_ev_sci_dispatch(void)
+{
+        struct acpi_sci_handler_info *sci_handler;
+        acpi_cpu_flags flags;
+        u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
+
+        ACPI_FUNCTION_NAME(ev_sci_dispatch);
+
+        /* Are there any host-installed SCI handlers? */
+
+        if (!acpi_gbl_sci_handler_list) {
+                return (int_status);
+        }
+
+        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+        /* Invoke all host-installed SCI handlers */
+
+        sci_handler = acpi_gbl_sci_handler_list;
+        while (sci_handler) {
+
+                /* Invoke the installed handler (at interrupt level) */
+
+                int_status |= sci_handler->address((u32)acpi_gbl_FADT.
+                                                   sci_interrupt,
+                                                   sci_handler->context);
+
+                sci_handler = sci_handler->next;
+        }
+
+        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+        return (int_status);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ev_sci_xrupt_handler
  *
  * PARAMETERS:  context   - Calling Context
@@ -89,6 +135,10 @@ static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(void *context)
          */
         interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
 
+        /* Invoke all host-installed SCI handlers */
+
+        interrupt_handled |= acpi_ev_sci_dispatch();
+
         return_UINT32(interrupt_handled);
 }
 
@@ -112,14 +162,13 @@ u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(void *context)
         ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
 
         /*
-         * We are guaranteed by the ACPI CA initialization/shutdown code that
+         * We are guaranteed by the ACPICA initialization/shutdown code that
          * if this interrupt handler is installed, ACPI is enabled.
          */
 
         /* GPEs: Check for and dispatch any GPEs that have occurred */
 
         interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
-
         return_UINT32(interrupt_handled);
 }
 
@@ -150,15 +199,15 @@ u32 acpi_ev_install_sci_handler(void)
 
 /******************************************************************************
  *
- * FUNCTION:    acpi_ev_remove_sci_handler
+ * FUNCTION:    acpi_ev_remove_all_sci_handlers
  *
  * PARAMETERS:  none
  *
- * RETURN:      E_OK if handler uninstalled OK, E_ERROR if handler was not
+ * RETURN:      AE_OK if handler uninstalled, AE_ERROR if handler was not
  *              installed to begin with
  *
  * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
- *              taken.
+ *              taken. Remove all host-installed SCI handlers.
  *
  * Note:  It doesn't seem important to disable all events or set the event
  *        enable registers to their original values. The OS should disable
@@ -167,11 +216,13 @@ u32 acpi_ev_install_sci_handler(void)
  *
  ******************************************************************************/
 
-acpi_status acpi_ev_remove_sci_handler(void)
+acpi_status acpi_ev_remove_all_sci_handlers(void)
 {
+        struct acpi_sci_handler_info *sci_handler;
+        acpi_cpu_flags flags;
         acpi_status status;
 
-        ACPI_FUNCTION_TRACE(ev_remove_sci_handler);
+        ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers);
 
         /* Just let the OS remove the handler and disable the level */
 
@@ -179,6 +230,21 @@ acpi_status acpi_ev_remove_sci_handler(void)
             acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
                                              acpi_ev_sci_xrupt_handler);
 
+        if (!acpi_gbl_sci_handler_list) {
+                return (status);
+        }
+
+        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+        /* Free all host-installed SCI handlers */
+
+        while (acpi_gbl_sci_handler_list) {
+                sci_handler = acpi_gbl_sci_handler_list;
+                acpi_gbl_sci_handler_list = sci_handler->next;
+                ACPI_FREE(sci_handler);
+        }
+
+        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
         return_ACPI_STATUS(status);
 }
 
diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
index ca5fba99c33b..6f56146a6f88 100644
--- a/drivers/acpi/acpica/evxface.c
+++ b/drivers/acpi/acpica/evxface.c
@@ -385,6 +385,144 @@ ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
 #if (!ACPI_REDUCED_HARDWARE)
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_install_sci_handler
+ *
+ * PARAMETERS:  address             - Address of the handler
+ *              context             - Value passed to the handler on each SCI
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for a System Control Interrupt.
+ *
+ ******************************************************************************/
+acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context)
+{
+        struct acpi_sci_handler_info *new_sci_handler;
+        struct acpi_sci_handler_info *sci_handler;
+        acpi_cpu_flags flags;
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(acpi_install_sci_handler);
+
+        if (!address) {
+                return_ACPI_STATUS(AE_BAD_PARAMETER);
+        }
+
+        /* Allocate and init a handler object */
+
+        new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info));
+        if (!new_sci_handler) {
+                return_ACPI_STATUS(AE_NO_MEMORY);
+        }
+
+        new_sci_handler->address = address;
+        new_sci_handler->context = context;
+
+        status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+        if (ACPI_FAILURE(status)) {
+                goto exit;
+        }
+
+        /* Lock list during installation */
+
+        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+        sci_handler = acpi_gbl_sci_handler_list;
+
+        /* Ensure handler does not already exist */
+
+        while (sci_handler) {
+                if (address == sci_handler->address) {
+                        status = AE_ALREADY_EXISTS;
+                        goto unlock_and_exit;
+                }
+
+                sci_handler = sci_handler->next;
+        }
+
+        /* Install the new handler into the global list (at head) */
+
+        new_sci_handler->next = acpi_gbl_sci_handler_list;
+        acpi_gbl_sci_handler_list = new_sci_handler;
+
+      unlock_and_exit:
+
+        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+        (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+
+      exit:
+        if (ACPI_FAILURE(status)) {
+                ACPI_FREE(new_sci_handler);
+        }
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_remove_sci_handler
+ *
+ * PARAMETERS:  address             - Address of the handler
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove a handler for a System Control Interrupt.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_remove_sci_handler(acpi_sci_handler address)
+{
+        struct acpi_sci_handler_info *prev_sci_handler;
+        struct acpi_sci_handler_info *next_sci_handler;
+        acpi_cpu_flags flags;
+        acpi_status status;
+
+        ACPI_FUNCTION_TRACE(acpi_remove_sci_handler);
+
+        if (!address) {
+                return_ACPI_STATUS(AE_BAD_PARAMETER);
+        }
+
+        status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /* Remove the SCI handler with lock */
+
+        flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
+
+        prev_sci_handler = NULL;
+        next_sci_handler = acpi_gbl_sci_handler_list;
+        while (next_sci_handler) {
+                if (next_sci_handler->address == address) {
+
+                        /* Unlink and free the SCI handler info block */
+
+                        if (prev_sci_handler) {
+                                prev_sci_handler->next = next_sci_handler->next;
+                        } else {
+                                acpi_gbl_sci_handler_list =
+                                    next_sci_handler->next;
+                        }
+
+                        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+                        ACPI_FREE(next_sci_handler);
+                        goto unlock_and_exit;
+                }
+
+                prev_sci_handler = next_sci_handler;
+                next_sci_handler = next_sci_handler->next;
+        }
+
+        acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+        status = AE_NOT_EXIST;
+
+      unlock_and_exit:
+        (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_install_global_event_handler
  *
  * PARAMETERS:  handler         - Pointer to the global event handler function
@@ -398,6 +536,7 @@ ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
  *              Can be used to update event counters, etc.
  *
  ******************************************************************************/
+
 acpi_status
 acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
 {
diff --git a/drivers/acpi/acpica/utglobal.c b/drivers/acpi/acpica/utglobal.c
index d6f26bf8a062..046d5b059c07 100644
--- a/drivers/acpi/acpica/utglobal.c
+++ b/drivers/acpi/acpica/utglobal.c
@@ -291,7 +291,7 @@ acpi_status acpi_ut_init_globals(void)
 
 #if (!ACPI_REDUCED_HARDWARE)
 
-        /* GPE support */
+        /* GPE/SCI support */
 
         acpi_gbl_all_gpes_initialized = FALSE;
         acpi_gbl_gpe_xrupt_list_head = NULL;
@@ -300,6 +300,7 @@ acpi_status acpi_ut_init_globals(void)
         acpi_current_gpe_count = 0;
 
         acpi_gbl_global_event_handler = NULL;
+        acpi_gbl_sci_handler_list = NULL;
 
 #endif                          /* !ACPI_REDUCED_HARDWARE */