ACPI: Pre-map 'system event' related register blocks

During ACPI initialization, pre-map fixed hardware registers that are
accessed during ACPI's 'system event' related IRQ handing.

ACPI's 'system event' handing accesses specific fixed hardware
registers; namely PM1a event, PM1b event, GPE0, and GPE1 register
blocks which are declared within the FADT.  If these registers are
backed by MMIO, as opposed to I/O port space, accessing them within
interrupt context will cause a panic as acpi_os_read_memory()
depends on ioremap() in such cases - BZ 18012.

By utilizing the functionality provided in the previous two patches -
ACPI: Maintain a list of ACPI memory mapped I/O remappings, and, ACPI:
Add interfaces for ioremapping/iounmapping ACPI registers - accesses
to ACPI MMIO areas will now be safe from within interrupt contexts (IRQ
and/or NMI) provided the area was pre-mapped.  This solves BZ 18012.

ACPI "System Event" reference(s):
  ACPI Specification, Revision 4.0, Section 3 "ACPI Overview",
  3.8 "System Events", 5.6 "ACPI Event Programming Model".

Reference: https://bugzilla.kernel.org/show_bug.cgi?id=18012

Reported-by: <bjorn.helgaas@hp.com>
Signed-off-by: Myron Stowe <myron.stowe@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 40 insertions, 31 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index fc6c5d21c3eb..c63d4cb37dab 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -199,36 +199,6 @@ static int __init acpi_reserve_resources(void)
 }
 device_initcall(acpi_reserve_resources);
 
-acpi_status __init acpi_os_initialize(void)
-{
-        return AE_OK;
-}
-
-acpi_status acpi_os_initialize1(void)
-{
-        kacpid_wq = create_workqueue("kacpid");
-        kacpi_notify_wq = create_workqueue("kacpi_notify");
-        kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
-        BUG_ON(!kacpid_wq);
-        BUG_ON(!kacpi_notify_wq);
-        BUG_ON(!kacpi_hotplug_wq);
-        return AE_OK;
-}
-
-acpi_status acpi_os_terminate(void)
-{
-        if (acpi_irq_handler) {
-                acpi_os_remove_interrupt_handler(acpi_irq_irq,
-                                                 acpi_irq_handler);
-        }
-
-        destroy_workqueue(kacpid_wq);
-        destroy_workqueue(kacpi_notify_wq);
-        destroy_workqueue(kacpi_hotplug_wq);
-
-        return AE_OK;
-}
-
 void acpi_os_printf(const char *fmt, ...)
 {
         va_list args;
@@ -1598,5 +1568,44 @@ acpi_os_validate_address (
         }
         return AE_OK;
 }
-
 #endif
+
+acpi_status __init acpi_os_initialize(void)
+{
+        acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
+        acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
+        acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
+        acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
+
+        return AE_OK;
+}
+
+acpi_status acpi_os_initialize1(void)
+{
+        kacpid_wq = create_workqueue("kacpid");
+        kacpi_notify_wq = create_workqueue("kacpi_notify");
+        kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
+        BUG_ON(!kacpid_wq);
+        BUG_ON(!kacpi_notify_wq);
+        BUG_ON(!kacpi_hotplug_wq);
+        return AE_OK;
+}
+
+acpi_status acpi_os_terminate(void)
+{
+        if (acpi_irq_handler) {
+                acpi_os_remove_interrupt_handler(acpi_irq_irq,
+                                                 acpi_irq_handler);
+        }
+
+        acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
+        acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
+        acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
+        acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
+
+        destroy_workqueue(kacpid_wq);
+        destroy_workqueue(kacpi_notify_wq);
+        destroy_workqueue(kacpi_hotplug_wq);
+
+        return AE_OK;
+}